WO2023050281A1 - 电池单体及其制造方法和制造系统、电池以及用电装置 - Google Patents

电池单体及其制造方法和制造系统、电池以及用电装置 Download PDF

Info

Publication number
WO2023050281A1
WO2023050281A1 PCT/CN2021/122104 CN2021122104W WO2023050281A1 WO 2023050281 A1 WO2023050281 A1 WO 2023050281A1 CN 2021122104 W CN2021122104 W CN 2021122104W WO 2023050281 A1 WO2023050281 A1 WO 2023050281A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery cell
tab
electrode assembly
fixing structure
cell according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/122104
Other languages
English (en)
French (fr)
Inventor
方堃
郭志君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202180081089.7A priority Critical patent/CN116529941B/zh
Priority to KR1020237004892A priority patent/KR102897974B1/ko
Priority to EP21958858.9A priority patent/EP4354624A4/en
Priority to JP2023509718A priority patent/JP7739414B2/ja
Priority to PCT/CN2021/122104 priority patent/WO2023050281A1/zh
Priority to US18/112,501 priority patent/US12614822B2/en
Publication of WO2023050281A1 publication Critical patent/WO2023050281A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of battery technology, and more specifically, to a battery cell, a manufacturing method and system thereof, a battery, and an electrical device.
  • Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • the battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.
  • the present application provides a battery cell, a manufacturing method and a manufacturing system thereof, a battery and an electrical device, which can improve the safety of the battery cell.
  • the embodiment of the present application provides a battery cell, including:
  • a housing having an opening
  • the electrode assembly is accommodated in the casing, and the electrode assembly is provided with a first tab at one end facing the opening;
  • the end cap is used to cover the opening, the end cap includes a first connecting portion and a weakened portion, the weakened portion is arranged along the edge of the first connecting portion, and the end cap is configured to rupture along the weakened portion when the internal pressure of the battery cell reaches a threshold value , to release internal pressure;
  • the battery cell further includes a fixing structure, and the fixing structure is used for fixedly connecting the first connecting part to the first tab, so as to limit the movement of the first connecting part.
  • the first connecting portion of the end cap is fixedly connected to the first tab of the electrode assembly through a fixing structure, so that the first tab of the electrode assembly can limit the movement of the first connecting portion during the use of the battery cell.
  • the first connecting portion is electrically connected to the first tab through a fixing structure.
  • the end cap can be charged, and it can be used as the output pole of the battery cell, thereby saving a traditional electrode terminal and simplifying the structure of the battery cell.
  • the fixing structure is configured to be at least partially destroyed when the internal pressure of the battery cell reaches a threshold value so as to break the connection between the first connecting portion and the first tab.
  • the first connecting part can be The air pressure is blown open to increase the channel for releasing the internal pressure, thereby quickly releasing the internal pressure and improving safety.
  • the fixing structure is a welding part formed by welding the first tab and the first connecting part.
  • the first connecting portion is directly connected to the first tab by welding, which can simplify the structure of the battery cell.
  • the battery cell further includes a current collecting member disposed between the end cover and the first tab, and the current collecting member is used to connect the first connecting portion and the first tab to realize the connection between the end cover and the first tab. Electrical connection of tabs.
  • the fixing structure includes a first fixing structure and a second fixing structure.
  • the first fixing structure is a welding part formed by welding a part of the current collecting member with the first tab
  • the second fixing structure is the connection between the other part of the current collecting member and the first tab.
  • the welded part formed by welding.
  • the electrical connection between the end cap and the first tab is achieved by disposing the current collecting member in the battery cell, and welding the current collecting member, the first connecting portion, and the first tab respectively.
  • the current collecting member can be closely attached to the first connecting part, so as to reduce the risk of microcracks in the first connecting part, improve sealing performance, and reduce potential safety hazards.
  • the current collecting member includes a first collecting part and a second collecting part, the first collecting part surrounds the outside of the second collecting part, and the first fixing structure is the first collecting part and the first collecting part.
  • the welding portion formed by tab welding, the second fixing structure is a welding portion formed by welding the second current collecting portion and the first connecting portion.
  • the first fixing structure and the second fixing structure are respectively formed on the first collecting part and the second collecting part, so that the first fixing structure can be prevented from affecting the welding of the first connecting part and the collecting member, and the first fixing structure can be improved.
  • the connection strength of the connection part and the current collecting member are respectively formed on the first collecting part and the second collecting part, so that the first fixing structure can be prevented from affecting the welding of the first connecting part and the collecting member, and the first fixing structure can be improved.
  • the second fixing structure is configured to be broken when the internal pressure of the battery cell reaches a threshold to disconnect the connection between the second current collecting part and the first connecting part.
  • the second A connection part can be punched open by air pressure to increase the channel for releasing the internal pressure, so as to quickly release the internal pressure and improve safety.
  • connection strength between the second current collecting portion and the first connecting portion is smaller than the connection strength between the first current collecting portion and the first tab.
  • the end cap exerts a pulling force on the current collecting member and the first tab under the action of air pressure; since the connection strength between the second current collecting part and the first connecting part is smaller than that of the first The connection strength between the current part and the first tab, so the current collecting member will be separated from the first connecting part first; after the current collecting member will be separated from the first connecting part, the current collecting member will not be pulled by the end cover, so that it can maintain
  • the fixed connection of the current collecting member to the first lug reduces the risk of the current collecting member blocking the channel for releasing the internal pressure.
  • the first connecting portion includes a first protrusion and a first plate surrounding the first protrusion, the first protrusion protrudes from the inner surface of the first plate in a direction facing the electrode assembly, A first recess recessed from the outer surface of the first plate along a direction facing the electrode assembly is formed on the first connecting portion at a position corresponding to the first protrusion.
  • the weak portion is located on the outside of the first board and is arranged along the outer edge of the first board.
  • the second current collecting part is abutted against and welded with the first convex part to form a second fixing structure.
  • the first concave part can reduce the strength of the first convex part and improve the elasticity of the first convex part, so that when the battery cell vibrates, the first convex part can release the stress through deformation to reduce the stress transmitted to the weak part. stress and slow down the fatigue aging of weak parts.
  • the first concave part can also reduce the thickness of the first convex part, reduce the energy required for welding the first convex part and the second collector part, reduce the heat transferred to the weak part, and slow down the fatigue aging of the weak part.
  • the first header covers the weak portion in the thickness direction of the end cap.
  • the current collecting member can separate the weakened portion from the first tab, so as to reduce the active particles in the electrode assembly falling on the weakened portion and reduce the risk of the weakened portion being corroded.
  • the first protrusion supports the current collecting member to form an avoidance gap for avoiding the weak part between the first collector part and the end cap.
  • the first connecting portion supports the first tab through the current collecting member, so as to reduce the shaking amplitude of the electrode assembly when the battery unit vibrates, and improve the stability of the electrode assembly.
  • the avoidance gap can separate the weak part from the first collecting part, so as to prevent the first collecting part from blocking the channel for releasing the internal pressure when the weak part breaks, thereby improving safety.
  • the electrode assembly is a wound structure, and the electrode assembly has a first through hole at the center of the winding.
  • the second collector part is provided with a second through hole configured to be opposite to the first through hole to guide the gas in the electrode assembly to the first connection part.
  • the high-temperature and high-pressure gas can act on the first connection part through the first through hole and the second through hole, thereby quickly disconnecting the connection between the first connection part and the current collecting member .
  • the end cover further includes a second connecting portion, which surrounds the outer side of the first connecting portion and is used for fixed connection with the casing.
  • the weak part is located between the first connecting part and the second connecting part and is used for connecting the first connecting part and the second connecting part.
  • the end cover is fixed to the housing through the second connecting part surrounding the outer side of the weak part, so as to increase the distance between the weak part and the housing, reduce the stress transmitted to the weak part, and slow down the fatigue aging of the weak part.
  • the weakened portion is used to rupture and disconnect the connection between the first connection portion and the second connection portion when the internal pressure of the battery cell reaches a threshold value.
  • the first connecting part and the second connecting part can be turned outwards under the action of internal pressure, so as to increase the capacity for internal discharge.
  • Pressure channel so as to quickly release the internal pressure and improve safety.
  • the second connecting portion includes a second plate body and a second protrusion surrounding the outside of the second plate body, the second protrusion protrudes from the inner surface of the second plate body in a direction facing the electrode assembly, A second recess recessed from the outer surface of the second plate body along a direction facing the electrode assembly is formed on the second connecting portion at a position corresponding to the second protrusion.
  • the second plate surrounds the outer side of the weak part, and the second convex part is used for fixed connection with the casing.
  • the second concave part can reduce the strength of the second convex part and improve the elasticity of the second convex part. In this way, when the battery cell vibrates, the stress on the casing is transmitted to the second convex part, and the second convex part can The stress is released through deformation to reduce the stress transmitted to the weak part and slow down the fatigue aging of the weak part.
  • the outer surface of the second protrusion abuts against the inner surface of the housing and is used for welding with the housing to close the opening.
  • welding can realize sealing, reduce the risk of electrolyte leakage, and improve the connection strength and flow-through capacity between the second protrusion and the casing.
  • the second concave part can reduce the strength of the second convex part and improve the elasticity of the second convex part. In this way, in the process of welding the second convex part and the shell, the second convex part can release the welding stress through deformation, thereby reducing the welding area. The risk of deformation and cracking reduces the welding stress transmitted to the weak part and improves safety.
  • the second protrusion abuts against the first tab to support the first tab.
  • the second protrusion supports the first tab, so as to reduce the shaking amplitude of the electrode assembly when the battery cell vibrates, and improve the stability of the electrode assembly.
  • the weakened portion circles around the first connecting portion.
  • the weakened portion surrounds the first connecting portion, which can increase the range of the weakened portion, increase the exhaust rate when the weakened portion is ruptured, and improve safety.
  • the end cap is provided with a groove, and the area of the end cap opposite to the groove forms a weak portion.
  • the thickness and strength of the weak portion are reduced by setting the groove, so that the end cap can be broken along the weak portion when the internal pressure of the battery cell reaches a threshold value.
  • the end cap includes a first nickel layer, a steel layer and a second nickel layer, the first nickel layer is disposed on the surface of the steel layer facing the first tab, and the second nickel layer is disposed on the steel layer facing away from the first pole the surface of the ear.
  • the groove is recessed from the surface of the first nickel layer away from the steel layer along the direction facing the second nickel layer, and the depth of the groove is greater than the thickness of the first nickel layer and less than the sum of the thicknesses of the first nickel layer and the steel layer.
  • the groove is located on the inner side of the end cap, and the outer second nickel layer will not be damaged during the forming process, so the second nickel layer can protect the steel layer from the outside to reduce the risk of corrosion of the steel layer; the steel layer itself It is not easily corroded by the electrolyte, so even if the groove exposes the steel layer, it is not easy to cause a safety risk.
  • the end cap is used to electrically connect the first tab to the housing.
  • the casing itself can be used as the output pole of the battery cells.
  • the casing can be electrically connected to the confluence part, which can not only increase the flow area, but also make the confluence part
  • the structural design is more flexible.
  • the casing further includes a side wall and a bottom wall connected to the side wall, the side wall extends along the thickness direction of the end cap and is arranged around the periphery of the electrode assembly, and the bottom wall is provided with an electrode lead-out hole.
  • the electrode assembly further includes a second tab opposite in polarity to the first tab, and the second tab is disposed at an end of the electrode assembly away from the opening.
  • the battery cell also includes an electrode terminal installed in the electrode lead-out hole, and the electrode terminal is electrically connected to the second tab.
  • the bottom wall and the electrode terminals can be used as the two output poles of the battery cell, which can simplify the structure of the battery cell and ensure the overcurrent capability of the battery cell.
  • the bottom wall and the electrode terminals are located at the same end of the battery cells, so that when a plurality of battery cells are assembled into a group, the bus components can be assembled on the same side of the battery cells, which can simplify the assembly process and improve assembly efficiency.
  • the bottom wall and the side walls are integrally formed structures.
  • the above solution can save the connecting process of the bottom wall and the side wall.
  • the first tab is a negative tab
  • the base material of the casing is steel
  • the casing is electrically connected to the negative electrode tab, that is, the casing is in a low potential state.
  • the steel shell is not easily corroded by the electrolyte in a low potential state to reduce safety risks.
  • the battery cells are cylindrical battery cells.
  • an embodiment of the present application provides a battery, including a plurality of battery cells in any embodiment of the first aspect.
  • an embodiment of the present application provides an electrical device, including the battery in the second aspect, and the battery is used to provide electrical energy.
  • the embodiment of the present application provides a method for manufacturing a battery cell, including:
  • An electrode assembly is provided, and the electrode assembly is installed in the casing, and the electrode assembly is provided with a first tab at one end facing the opening;
  • the end cover includes a first connecting part and a weak part, and the weak part is arranged along the edge of the first connecting part;
  • the end cap is configured to rupture along the weak portion when the internal pressure of the battery cell reaches a threshold value, so as to release the internal pressure.
  • the embodiment of the present application provides a battery cell manufacturing system, including:
  • the first providing device is used for providing a casing, the casing has an opening;
  • the second providing device is used to provide the electrode assembly and install the electrode assembly into the casing, and the electrode assembly is provided with a first tab at the end facing the opening;
  • the third providing device is used to provide an end cover, and connect the end cover to the housing so that the end cover covers the opening, the end cover includes a first connection part and a weak part, and the weak part is arranged along the edge of the first connection part ;
  • an assembling device configured to fixedly connect the first connecting part to the first tab and form a fixed structure to limit the movement of the first connecting part
  • the end cap is configured to rupture along the weak portion when the internal pressure of the battery cell reaches a threshold value, so as to release the internal pressure.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • FIG. 3 is an explosion schematic diagram of the battery module shown in FIG. 2;
  • Fig. 4 is a schematic explosion diagram of a battery cell provided by some embodiments of the present application.
  • Fig. 5 is a schematic cross-sectional view of a battery cell provided by some embodiments of the present application.
  • FIG. 6 is an enlarged schematic view of the battery cell shown in FIG. 5 at the circle frame A;
  • Fig. 7 is a schematic partial cross-sectional view of the end cap shown in Fig. 4;
  • Fig. 8 is a schematic cross-sectional view of a battery cell provided by another embodiment of the present application.
  • FIG. 9 is an enlarged schematic diagram of the battery cell shown in FIG. 8 at box B;
  • FIG. 10 is a schematic flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application.
  • Fig. 11 is a schematic block diagram of a battery cell manufacturing system provided by some embodiments of the present application.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • “Plurality” in this application refers to two or more (including two).
  • the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc.
  • the embodiment of the present application does not limit this.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area, and the positive electrode coating area It is coated with a positive electrode active material layer, and the positive electrode tab is not coated with a positive electrode active material layer.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes the positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area The negative electrode active material layer is coated, and the negative electrode tab is not coated with the negative electrode active material layer.
  • the material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon.
  • the material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the battery cell also includes a case and an end cover.
  • the case has an opening for accommodating the electrode assembly.
  • the electrode assembly can be assembled into the case through the opening of the case.
  • the end cap is used to cover the opening of the housing to achieve sealing.
  • the pressure relief mechanism on the battery cell has an important impact on the safety of the battery cell. For example, when a short circuit, overcharge, etc. occur, it may cause thermal runaway inside the battery cell and a sudden increase in pressure. In this case, the internal pressure can be released outward by actuating the pressure relief mechanism to prevent the battery cells from exploding and igniting.
  • the pressure relief mechanism refers to an element or part that is activated to release the internal pressure when the internal pressure of the battery cell reaches a predetermined threshold.
  • the threshold design varies according to design requirements. The threshold may depend on the materials of one or more of the positive pole piece, the negative pole piece, the electrolyte and the separator in the battery cell.
  • the pressure relief mechanism can take the form of an explosion-proof valve, gas valve, pressure relief valve or safety valve, etc., and can specifically adopt a pressure sensitive element or structure, that is, when the internal pressure of the battery cell reaches a predetermined threshold, the pressure relief mechanism executes A weak portion provided in the action or pressure relief mechanism ruptures, thereby forming an opening or passage for internal pressure relief.
  • the "activation" mentioned in this application means that the pressure relief mechanism is activated or activated to a certain state, so that the internal pressure of the battery cell can be released. Actions by the pressure relief mechanism may include, but are not limited to, at least a portion of the pressure relief mechanism rupture, shatter, be torn, or open, among others.
  • the pressure relief mechanism When the pressure relief mechanism is actuated, the high-temperature and high-pressure material inside the battery cell will be discharged from the actuated part as discharge. In this manner, the battery cells can be depressurized under controllable pressure, thereby avoiding potential more serious accidents.
  • the emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrodes, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc.
  • the inventors tried to integrate the pressure relief mechanism into the end cap.
  • the inventors provided a weakened portion on the end cap, and the end cap is configured to rupture along the weakened portion when the internal pressure of the battery cell reaches a threshold value to release the internal pressure.
  • a short circuit, overcharge, etc. it may cause thermal runaway inside the battery cell and a sudden increase in pressure.
  • the internal pressure can be released through the rupture of the weak part to prevent the battery cell from exploding and catching fire. , thereby improving security.
  • the inventors analyzed and studied the structure and use environment of the battery cell.
  • the inventors found that the weak part of the end cap has premature fatigue aging, which leads to a decrease in the opening threshold of the end cap.
  • the weak part of the end cap will rupture in advance.
  • the internal pressure of the battery cell alternately changes from high to low, resulting in the reciprocating flipping of the end cap.
  • the end cap is turned back and forth for a long time, it will cause fatigue and aging of the weak part, which will lead to a decrease in the opening threshold of the end cap.
  • the embodiment of the present application provides a technical solution to limit the flipping of the end cap by fixing the end cap to the tab of the electrode assembly, reduce the alternating stress carried by the weak part, and relieve the fatigue of the weak part of the end cap Aging reduces the risk of premature rupture of the end cap and pressure release, which is conducive to improving the safety and stability of the battery cell.
  • Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.
  • the electric device is taken as an example for description.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 .
  • the battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .
  • the vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.
  • the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • the battery 2 includes a box body 5 and a battery cell (not shown in FIG. 2 ), and the battery cell is accommodated in the box body 5 .
  • the box body 5 is used to accommodate the battery cells, and the box body 5 may have various structures.
  • the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, the first box body part 5a and the second box body part 5a
  • the two box parts 5b jointly define an accommodating space 5c for accommodating the battery cells.
  • the second box body part 5b can be a hollow structure with one end open, the first box body part 5a is a plate-shaped structure, and the first box body part 5a covers the opening side of the second box body part 5b to form an accommodating space 5c
  • the box body 5; the first box body portion 5a and the second box body portion 5b also can be a hollow structure with one side opening, and the opening side of the first box body portion 5a is covered on the opening side of the second box body portion 5b , to form a box body 5 with an accommodating space 5c.
  • the first box body part 5a and the second box body part 5b can be in various shapes, such as a cylinder, a cuboid, and the like.
  • a sealant such as sealant, sealing ring, etc.
  • a sealant can also be arranged between the first box body part 5a and the second box body part 5b.
  • the first box part 5a covers the top of the second box part 5b
  • the first box part 5a can also be called an upper box cover
  • the second box part 5b can also be called a lower box.
  • the battery 2 there may be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in parallel.
  • the hybrid connection means that there are both series and parallel connections among the multiple battery cells.
  • a plurality of battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells is accommodated in the box 5; of course, it is also possible to first connect a plurality of battery cells in series or parallel or
  • the battery modules 6 are formed by parallel connection, and multiple battery modules 6 are connected in series or in parallel or in series to form a whole, and are housed in the box body 5 .
  • FIG. 3 is an exploded schematic diagram of the battery module shown in FIG. 2 .
  • FIG. 3 there are multiple battery cells 7 , and the multiple battery cells 7 are connected in series, in parallel, or in parallel to form a battery module 6 .
  • a plurality of battery modules 6 are connected in series, in parallel or in parallel to form a whole, and accommodated in the box.
  • the plurality of battery cells 7 in the battery module 6 can be electrically connected through a confluence component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells 7 in the battery module 6 .
  • Fig. 4 is a schematic exploded view of a battery cell provided by some embodiments of the present application
  • Fig. 5 is a schematic cross-sectional view of a battery cell provided by some embodiments of the present application
  • Fig. 6 is a schematic diagram of the battery cell shown in Fig. An enlarged schematic diagram of the .
  • the battery cell 7 of the embodiment of the present application includes: a casing 20 with an opening 21 ;
  • the end cover 30 includes a first connecting portion 31 and a weakened portion 32, the weak portion 32 is arranged along the edge of the first connecting portion 31, and the end cover 30 is configured as
  • the battery cell 7 further includes a fixing structure 60 for fixing the first connection part 31 to the first tab 11 so as to limit the movement of the first connection part 31 .
  • the electrode assembly 10 includes a first pole piece, a second pole piece and a spacer, and the spacer is used to separate the first pole piece from the second pole piece.
  • the polarities of the first pole piece and the second pole piece are opposite, in other words, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece pole piece.
  • first pole piece, the second pole piece and the separator are all strip-shaped structures, and the first pole piece, the second pole piece and the separator are wound as a whole to form a winding structure.
  • the winding structure can be a cylindrical structure, a flat structure or other shapes.
  • the electrode assembly 10 includes a main body 12 , a first tab 11 and a second tab 13 , and the first tab 11 and the second tab 13 protrude from the main body 12 .
  • the first tab 11 is the part of the first pole piece not coated with the active material layer
  • the second tab 13 is the part of the second pole piece not coated with the active material layer.
  • one of the first tab 11 and the second tab 13 is a tab of positive polarity
  • the other is a tab of negative polarity.
  • the first tab 11 and the second tab 13 may protrude from the same side of the main body 12, or may protrude from opposite sides respectively.
  • the first tab 11 and the second tab 13 are respectively provided on both sides of the main body 12 , in other words, the first tab 11 and the second tab 13 are respectively provided at both ends of the electrode assembly 10 .
  • the first tab 11 is located at the end of the electrode assembly 10 facing the end cover 30
  • the second tab 13 is located at the end of the electrode assembly 10 facing away from the end cover 30 .
  • the first tab 11 is wound in multiple turns around the central axis X of the electrode assembly 10 , in other words, the first tab 11 includes multiple turns of tab layers.
  • the first tab 11 is generally cylindrical, and there is a gap between two adjacent tab layers.
  • the first tab 11 can be treated to reduce the gap between the tab layers, so as to facilitate the connection of the first tab 11 to other electrical structures.
  • the first tab 11 can be flattened so that the end area of the first tab 11 away from the main body 12 can be gathered together; One end of the main body 12 forms a dense end surface, which reduces the gap between tab layers and facilitates the connection of the first tab 11 with other conductive structures.
  • a conductive material may also be filled between two adjacent tab layers, so as to reduce the gap between the tab layers.
  • the second tab 13 is wound in multiple turns around the central axis X of the electrode assembly 10 , and the second tab 13 includes multiple turns of tab layers.
  • the second tab 13 has also been smoothed to reduce the gap between the tab layers of the second tab 13 .
  • the housing 20 can be a hollow structure with one side open, or a hollow structure with two sides open.
  • the end cap 30 covers the opening of the housing 20 to form a sealed connection, so as to form an accommodating chamber for accommodating the electrode assembly and the electrolyte.
  • the housing 20 can be in various shapes, such as cylinder, cuboid and so on.
  • the shape of the case 20 may be determined according to the specific shape of the electrode assembly 10 . For example, if the electrode assembly 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected.
  • the casing 20 includes a side wall 22 and a bottom wall 23 , the side wall 22 surrounds the outer side of the electrode assembly 10 , and the bottom wall 23 is connected to an end of the side wall 22 .
  • the side wall 22 is a cylindrical structure, for example, the side wall 22 can be a cylinder or a square tube; the bottom wall 23 is a plate structure, and its shape corresponds to the shape of the side wall 22 .
  • an opening 21 is formed at one end of the side wall 22 , and the bottom wall 23 is connected to the other end of the side wall 22 facing away from the opening 21 .
  • the side wall 22 and the bottom wall 23 may be integrally formed, that is, the housing 20 is an integrally formed member.
  • the side wall 22 and the bottom wall 23 can also be two components provided separately, and then connected together by means of welding, riveting, bonding or the like.
  • the end cap 30 may be electrically connected to the electrode assembly 10 , or may be insulated from the electrode assembly 10 .
  • the end cap 30 is electrically connected to the first tab 11 .
  • the end cover 30 may be directly electrically connected to the first tab 11 , or may be electrically connected to the first tab 11 through other conductive members.
  • the end cap 30 is fixedly connected to the housing 20 .
  • the end cover 30 can be connected to the housing 20 by welding, clamping, bonding or other methods, so as to fix the end cover 30 on the housing 20 .
  • the end cover 30 can be electrically connected to the housing 20 , and can also be insulatedly connected to the housing 20 .
  • the housing 20 may be positively charged, negatively charged, or uncharged.
  • the case 20 may be directly connected to the tab of the electrode assembly 10 , or may be electrically connected to the tab through other conductive members (such as the end cap 30 ).
  • the end cap 30 and the housing 20 can be connected by welding, so that the end cap 30 and the housing 20 can have the same polarity.
  • the end cap 30 can be used to electrically connect the housing 20 to the positive pole lug; when the housing 20 needs to be negatively charged, the end cap 30 can be used to connect the housing 20 Electrically connected to the negative polarity tab.
  • the housing 20 may also be connected to the tab through other conductive structures, which is not limited in this embodiment.
  • the housing 20 and the end cap 30 can be made of the same material or different materials.
  • the strength of the weak portion 32 is weaker than that of other parts of the end cap 30 , and the weak portion 32 is a portion of the end cap 30 that is easy to be broken, broken, torn or opened.
  • the weakened portion 32 can be formed by thinning the predetermined area of the end cap 30 , the weakened portion 32 can be formed by performing material treatment on the predetermined area of the end cap 30 , and the predetermined area of the end cap 30 can be heated.
  • the weakened portion 32 is formed in a predetermined area of the end cap 30 by forming the weakened portion 32 or by other means.
  • the weak portion 32 extends along the circumferential direction of the first connecting portion 31 and is connected to an edge of the first connecting portion 31 .
  • the weakened part 32 may surround the first connecting part 31 once, or may only surround the first connecting part for 1/2, 2/3 or 3/4 of a circle, which is not limited in this embodiment.
  • the fixing structure 60 can directly fix and connect the first connecting portion 31 to the first tab 11 , or indirectly fix and connect the first connecting portion 31 to the first tab 11 through other components.
  • the fixing structure 60 can be a welding part formed by welding, or an adhesive layer after the adhesive is cured, or other structures, as long as the fixed connection between the first tab 11 and the first connecting part 31 can be realized. Can.
  • the fixing structure 60 can be a conductive structure to electrically connect the first connecting portion 31 to the first tab 11; of course, alternatively, the fixing structure 60 can also be an insulating structure to connect the first connecting portion 31 to the first pole.
  • the ear 11 is insulated and isolated.
  • the strength of the fixing structure 60 can be set according to requirements. When the internal pressure of the battery cell 7 reaches a threshold value, the fixing structure 60 may be destroyed under the action of the internal pressure, so as to disconnect the connection between the first connecting portion 31 and the first tab 11 .
  • the fixing structure 60 may also have a relatively high strength, and the fixing structure 60 can maintain the connection between the first connecting portion 31 and the first tab 11 when the internal pressure of the battery cell 7 reaches a threshold.
  • the internal pressure of the battery cell changes alternately, which makes the end cap bulge away from the electrode assembly or sink in the direction close to the electrode assembly.
  • the weak part will bear alternating stress and undergo alternating fatigue aging or fracture, resulting in a decrease in the strength of the weak part, and it is easy for the internal pressure of the battery cell to reach the preset threshold.
  • the weak part will rupture to release the internal pressure of the battery cell, causing the end cap to rupture and release pressure in advance.
  • the first connecting portion 31 of the end cap 30 is fixedly connected to the first tab 11 of the electrode assembly 10 through the fixing structure 60, so that the first tab 11 of the electrode assembly 10 can be used in the battery cell 7 .
  • the movement of the first connecting part 31 is restricted, thereby reducing the deformation and turning of the end cover 30, reducing the alternating stress carried by the weak part 32, slowing down the fatigue aging of the weak part 32 of the end cover 30, and reducing the wear and tear of the end cover 30.
  • the risk of premature rupture and pressure release of the battery cell 7 under normal use is conducive to improving the safety and stability of the battery cell 7 .
  • end cap 30 is a monolithic structure.
  • the weak portion 32 surrounds the first connecting portion 31 once.
  • the weak portion 32 is an annular structure surrounding the outer side of the first connecting portion 31 , and its shape corresponds to the outline of the first connecting portion 31 .
  • the first connecting portion 31 is located in the area surrounded by the weak portion 32 .
  • the area surrounded by the weak portion 32 may be circular, rectangular, racetrack-shaped or elliptical.
  • the weakened portion 32 surrounds the first connecting portion 31 in a circle, so that the range of the weakened portion 32 can be enlarged, and the exhaust rate can be increased when the weakened portion 32 is broken, thereby improving safety.
  • the first connecting portion 31 is electrically connected to the first tab 11 through the fixing structure 60 .
  • the fixing structure 60 has electrical conductivity, which can realize the electrical connection between the end cover 30 and the first tab 11 .
  • the end cap 30 can be charged, and it can be used as the output pole of the battery cell 7 , thereby saving a traditional electrode terminal and simplifying the structure of the battery cell 7 .
  • the end cap 30 is used to electrically connect the first tab 11 to the housing 20 .
  • the casing 20 itself can serve as the output pole of the battery cell 7 .
  • the housing 20 can be electrically connected to the busbar, which can not only increase the flow area, but also make the structural design of the busbar more flexible.
  • the casing 20 further includes a side wall 22 and a bottom wall 23 connected to the side wall 22.
  • the side wall 22 extends along the thickness direction Z of the end cover 30 and is arranged around the periphery of the electrode assembly 10.
  • the bottom wall 23 is arranged There are electrode extraction holes 231 .
  • the electrode assembly 10 further includes a second tab 13 opposite in polarity to the first tab 11 , and the second tab 13 is disposed at an end of the electrode assembly 10 away from the opening 21 .
  • the battery cell 7 further includes an electrode terminal 40 installed in the electrode lead-out hole 231 , and the electrode terminal 40 is electrically connected to the second tab 13 .
  • the second tab 13 may be directly electrically connected to the electrode terminal 40 , or may be indirectly electrically connected to the electrode terminal 40 through other conductive structures.
  • the electrode terminal 40 is insulated from the bottom wall 23 .
  • the electrode terminal 40 and the bottom wall 23 may have different polarities.
  • the electrode terminal 40 and the bottom wall 23 may serve as two output poles of the battery cell 7 .
  • the bottom wall 23 is the negative output pole of the battery cell 7
  • the electrode terminal 40 is the positive output pole of the battery cell 7
  • the bottom wall 23 is the positive output pole of the battery cell 7
  • the electrode terminal 40 is the negative output pole of the battery cell 7 .
  • the electrode terminal 40 is fixed on the bottom wall 23 .
  • the electrode terminals 40 can be integrally fixed on the outside of the bottom wall 23 , or can extend into the inside of the casing 20 through the electrode lead-out hole 231 .
  • the first tab 11 is located at one end of the electrode assembly 10 facing the end cover 30, so as to facilitate the electrical connection between the end cover 30 and the first tab 11; correspondingly, the second tab 13 is located at one end of the electrode assembly 10 facing the bottom wall 23 , so as to facilitate the electrical connection between the electrode terminal 40 and the second tab 13 .
  • the first tab 11 and the second tab 13 are arranged at both ends of the electrode assembly 10, which can reduce the risk of conduction between the first tab 11 and the second tab 13, and increase the size of the first tab. 11 and the second tab 13 flow area.
  • the bottom wall 23 and the electrode terminal 40 can be used as two output poles of the battery cell 7 , which can simplify the structure of the battery cell 7 and ensure the overcurrent capability of the battery cell 7 .
  • the bottom wall 23 and the electrode terminal 40 are located at the same end of the battery cells 7, so that when a plurality of battery cells 7 are assembled into groups, the confluence parts can be assembled to the same side of the battery cells 7, which can simplify the assembly process, Improve assembly efficiency.
  • the bottom wall 23 and the side wall 22 are integrally formed. In this embodiment, the connecting process of the bottom wall 23 and the side wall 22 can be omitted.
  • the housing 20 may be formed through a stretching process.
  • the electrode lead-out hole 231 in the embodiment of the present application is made after the casing 20 is stretched and formed.
  • the inventor has tried to roll the open end of the shell so that the open end of the shell is folded inward and forms a flanging structure, and the flanging structure presses the end cap to realize the fixing of the end cap.
  • the inventor installed the electrode terminal on the end cap, and used the flanging structure and the electrode terminal as the two output poles of the battery cell.
  • the larger the size of the flanged structure the higher the risk of curling and wrinkling after forming; if the flanged structure curls and folds, it will cause the surface of the flanged structure to be uneven.
  • welding there will be a problem of poor welding. Therefore, the size of the flange structure is relatively limited, resulting in insufficient flow capacity of the battery cell.
  • the electrode lead-out hole 231 for installing the electrode terminal 40 is formed on the bottom wall 23 by using the process of opening holes, so that the positive output pole and the negative output pole are arranged on the end of the battery cell 7 away from the opening 21; the bottom wall 23 is formed during the molding process of the casing 20, and the flatness of the bottom wall 23 can be ensured after the electrode lead-out hole 231 is opened, so as to ensure the connection strength between the bottom wall 23 and the confluence component.
  • the flatness of the bottom wall 23 is not restricted by its own size, so the bottom wall 23 can have a larger size, thereby improving the flow capacity of the battery cell 7 .
  • the first tab 11 is a negative tab
  • the base material of the casing 20 is steel
  • the casing 20 is electrically connected to the negative electrode tab, that is, the casing 20 is in a low potential state.
  • the steel casing 20 is not easily corroded by the electrolyte in a low potential state, so as to reduce safety risks.
  • housing 20 is welded to end cap 30 . Welding can not only realize the connection between the housing 20 and the end cover 30, improve the flow capacity between the housing 20 and the end cover 30, but also ensure the sealing.
  • the base material of the shell 20 and the base material of the end cap 30 are the same.
  • the base material of the shell 20 and the base material of the end cover 30 are both steel.
  • the base material of the housing 20 is the same as that of the end cover 30 , so that the welding strength between the housing 20 and the end cover 30 can be ensured, and the sealing of the battery cells 7 can be ensured.
  • the battery cells 7 are cylindrical battery cells.
  • the electrode assembly 10 is a cylindrical structure, and the casing 20 is a cylindrical hollow structure.
  • the fixing structure 60 is configured such that when the internal pressure of the battery cell 7 reaches a threshold value, at least a part thereof is destroyed to disconnect the connection between the first connecting portion 31 and the first tab 11 .
  • the electrode assembly 10 When the thermal runaway of the battery cell 7 occurs, the electrode assembly 10 will generate high-temperature and high-pressure gas, and the internal pressure of the battery cell 7 will increase with the increase of the gas.
  • the end cap 30 is deformed under the action of air pressure, and exerts tension on the fixing structure 60 .
  • the end cap 30 breaks the fixing structure 60 under the action of air pressure, so as to disconnect the fixed connection between the first connecting portion 31 and the first tab 11 .
  • the order of the rupture of the fixing structure 60 and the rupture of the weak portion 32 is not limited, as long as the internal pressure of the battery cell 7 reaches the threshold, both the fixing structure 60 and the weak portion 32 can be ruptured.
  • the first tab 11 will no longer restrict the movement of the first connecting portion 31; , the first connecting portion 31 can be flushed open by air pressure, so as to increase the channel for releasing the internal pressure, so as to quickly release the internal pressure and improve safety.
  • the weakened portion 32 circles the first connecting portion 31; after the rupture of the weakened portion 32, the connection between the first connecting portion 31 and other parts of the end cap 30 is disconnected, so that the first connecting portion 31 will Under the action of punching and breaking away from the battery cell 7.
  • the weakened portion 32 can also surround the first connecting portion 31 for less than one circle, and with the rupture of the weakened portion 32, the first connecting portion 31 remains connected to other parts of the end cap 30; however, under the action of air pressure Next, the first connecting portion 31 will turn outwards to increase the channel for releasing the internal pressure.
  • the battery cell 7 further includes a current collecting member 50 disposed between the end cover 30 and the first tab 11 , the current collecting member 50 is used to connect the first connecting portion 31 and the first tab 11 , In order to realize the electrical connection between the end cap 30 and the first tab 11 .
  • the fixing structure 60 includes a first fixing structure 61 and a second fixing structure 62, the first fixing structure 61 is a welding part formed by welding a part of the current collecting member 50 with the first tab 11, and the second fixing structure 62 is a current collecting member The other part of 50 is a welding part formed by welding with the first connecting part 31 .
  • a part of the current collecting member 50 is connected to the first tab 11 by welding, so as to realize the electrical connection between the current collecting member 50 and the first tab 11 .
  • Another part of the current collecting member 50 is connected to the first connecting portion 31 by welding, so as to realize the electrical connection between the current collecting member 50 and the end cap 30 .
  • the current collecting member 50 may also include other parts.
  • the current collecting member 50 is an independently formed member, which is different from the wound first tab 11, and the shape of the current collecting member 50 can be adaptively adjusted according to the shape of the end cap 30 to ensure the collection
  • the flow member 50 can be tightly attached to the first connecting portion 31 of the end cover 30 .
  • a current collecting member 50 is provided in the battery cell 7, and the current collecting member 50 is welded to the first connecting portion 31 and the first tab 11 respectively to realize electrical connection between the end cover 30 and the first tab 11. connect.
  • the current collecting member 50 can be closely attached to the first connecting portion 31 to reduce the risk of microcracks in the first connecting portion 31 , improve the sealing performance, and reduce potential safety hazards.
  • the current collecting member 50 is welded to the first tab 11 , even if micro cracks occur in the current collecting member 50 , it will not affect the sealing performance of the battery cell 7 .
  • the first fixing structure 61 and the second fixing structure 62 can fixedly connect the first connecting part 31 , the current collecting member 50 and the first tab 11 to limit the movement of the first connecting part 31 .
  • the current collecting member 50 includes a first collecting part 51 and a second collecting part 52, the first collecting part 51 surrounds the outside of the second collecting part 52, and the first fixing structure 61 is a first The welding portion formed by welding the current collecting portion 51 and the first tab 11 , and the second fixing structure 62 is a welding portion formed by welding the second current collecting portion 52 and the first connecting portion 31 .
  • the first collecting portion 51 is an annular structure surrounding the outside of the second collecting portion 52 .
  • the portion of the current collecting member 50 in contact with the first connecting portion 31 is the second collecting portion 52
  • the portion of the current collecting member 50 not in contact with the first connecting portion 31 is the first collecting portion 51 .
  • the first fixing structure 61 is located outside the second fixing structure 62 , that is, the first fixing structure 61 is closer to the side wall 22 of the casing 20 than the second fixing structure 62 .
  • the first fixing structure 61 and the second fixing structure 62 are structures formed after materials are melted, cooled and solidified, and their surfaces are uneven.
  • the current collecting member 50 When assembling the battery cell 7, the current collecting member 50 is pressed and welded to the first tab 11 to form the first fixing structure 61, and then the first connecting portion 31 and the current collecting member 50 are welded to form the second fixing structure. structure62. If the second fixing structure 62 overlaps with the first fixing structure 61 along the thickness direction Z of the end cover 30 , then when the first connecting portion 31 and the current collecting member 50 are welded, the first connecting portion 31 is used to connect with the current collecting member 50 The welded part needs to be pressed against the first fixing structure 61 .
  • the surface of the first fixing structure 61 is uneven, if the part of the first connecting part 31 used for welding with the current collecting member 50 is pressed against the first fixing structure 61, it is difficult for the first connecting part 31 to be fixed with the first fixing structure 61.
  • the structure 61 is in close contact, which will cause poor welding, affect the connection strength between the first connecting portion 31 and the current collecting member 50 , and cause the risk of forming microcracks in the first connecting portion 31 .
  • the first fixing structure 61 and the second fixing structure 62 are respectively formed on the first collecting part 51 and the second collecting part 52, so that the first fixing structure 61 can be prevented from affecting the first connecting part 31 and the collecting part.
  • the welding of the current collecting member 50 improves the connection strength between the first connecting portion 31 and the current collecting member 50 .
  • the second fixing structure 62 is configured to be destroyed when the internal pressure of the battery cell 7 reaches a threshold value so as to break the connection between the second collector portion 52 and the first connection portion 31 .
  • the electrode assembly 10 When the thermal runaway of the battery cell 7 occurs, the electrode assembly 10 will generate high-temperature and high-pressure gas, and the internal pressure of the battery cell 7 will increase with the increase of the gas.
  • the end cap 30 deforms under the action of air pressure, and exerts a pulling force on the second fixing structure 62 .
  • the end cap 30 breaks the second fixing structure 62 under the action of air pressure, so as to disconnect the fixed connection between the first connecting portion 31 and the second collector portion 52 .
  • the first tab 11 will no longer restrict the movement of the first connecting portion 31 by the current collecting member 50; with the rupture of the weak portion 32 , the first connecting portion 31 can be flushed open by air pressure, so as to increase the channel for releasing the internal pressure, so as to quickly release the internal pressure and improve safety.
  • the first fixing structure 61 when the internal pressure of the battery cell 7 reaches a threshold value, the first fixing structure 61 will maintain the connection between the first tab 11 and the first current collecting portion 51, so as to fix the current collecting member 50 and reduce the current collecting pressure.
  • the component 50 risks blocking the passage for relieving the internal pressure.
  • connection strength between the second current collecting portion 52 and the first connecting portion 31 is smaller than the connection strength between the first current collecting portion 51 and the first tab 11 .
  • connection strength between the second current collecting portion 52 and the first connecting portion 31 can be characterized by the tensile strength of the second fixing structure 62
  • connection strength between the first current collecting portion 51 and the first tab 11 can be characterized by the tensile strength of the first fixing structure 61.
  • Tensile strength characterization The tensile strength of the first fixing structure 61 and the tensile strength of the second fixing structure 62 can be tested by a tensile testing machine.
  • the electrode assembly 10 can be fixed on the fixture, and the tensile testing machine pulls the current collecting member 50 to break the first fixing structure 61 and separate the first tab 11 of the electrode assembly 10 from the current collecting member 50, and according to the test
  • the tensile strength of the first fixing structure 61 is calculated from the obtained data.
  • the tensile strength of the second fixing structure 62 can be measured in the same way.
  • the end cap 30 exerts a pulling force on the current collecting member 50 and the first tab 11 under the action of air pressure; since the connection strength between the second current collecting part 52 and the first connecting part 31 is smaller than that The connection strength between a current collecting portion 51 and the first tab 11, so the current collecting member 50 will be separated from the first connecting portion 31 first; after the current collecting member 50 is separated from the first connecting portion 31, the current collecting member 50 will not be damaged
  • the pulling force of the end cap 30 can maintain the fixed connection between the current collecting member 50 and the first tab 11 , reducing the risk that the current collecting member 50 will block the channel for releasing the internal pressure.
  • the first connecting portion 31 includes a first protrusion 311 and a first plate 312 surrounding the first protrusion 311, and the first protrusion 311 faces the electrode along the inner surface of the first plate 312.
  • the direction of the assembly 10 protrudes, and a first concave portion 313 is formed on the first connecting portion 31 corresponding to the first convex portion 311 from the outer surface of the first plate body 312 along the direction facing the electrode assembly 10 .
  • the weak portion 32 is located on the outer side of the first board body 312 and is disposed along the outer edge of the first board body 312 .
  • the second collecting portion 52 is abutted against and welded to the first protruding portion 311 to form a second fixing structure 62 .
  • the first plate body 312 can be an annular flat plate structure, which has an inner surface and an outer surface oppositely disposed along the thickness direction Z, and the inner surface of the first plate body 312 faces the electrode assembly 10 .
  • the first convex portion 311 protrudes from the weakened portion 32 in a direction facing the electrode assembly 10 .
  • the first concave portion 313 can reduce the strength of the first convex portion 311 and improve the elasticity of the first convex portion 311. In this way, when the battery cell 7 vibrates, the first convex portion 311 can release the stress through deformation to reduce the stress transmitted to the weak point. The stress of the weak portion 32 is reduced, and the fatigue aging of the weak portion 32 is slowed down.
  • the first concave part 313 can also reduce the thickness of the first convex part 311, reduce the energy required for welding the first convex part 311 and the second collector part 52, reduce the heat transferred to the weak part 32, and slow down the fatigue of the weak part 32 Ageing.
  • the first header portion 51 covers the weak portion 32 in the thickness direction Z of the end cap 30 .
  • the projection of the weakened portion 32 along the thickness direction Z is located within the projection of the first collector portion 51 along the thickness direction Z.
  • the current collecting member 50 can separate the weakened portion 32 from the first tab 11, so as to reduce the active particles in the electrode assembly 10 falling on the weakened portion 32, and reduce the risk of the weakened portion 32 being corroded .
  • the first protrusion 311 supports the current collecting member 50 to form an avoidance gap G for avoiding the weak portion 32 between the first collector portion 51 and the end cover 30 .
  • the escape gap G is a space formed between the first header 51 and the end cap 30 that is not filled with other solid members.
  • the avoidance gap G is opposite to the weak portion 32 along the thickness direction Z, thereby playing a role of avoiding the weak portion 32 .
  • the first connecting portion 31 supports the first tab 11 through the current collecting member 50 , so as to reduce the shaking amplitude of the electrode assembly 10 when the battery cell 7 vibrates, and improve the stability of the electrode assembly 10 .
  • the avoidance gap G can separate the weakened portion 32 from the first collecting portion 51, so as to prevent the first collecting portion 51 from blocking the channel for releasing the internal pressure when the weakened portion 32 is broken, thereby improving safety.
  • the electrode assembly 10 is a wound structure, and the electrode assembly 10 has a first through hole 14 at the center of the winding.
  • the second collector part 52 is provided with a second through hole 521 configured to be opposite to the first through hole 14 to guide the gas in the electrode assembly 10 to the first connection part 31 .
  • the first through hole 14 at least partially overlaps with the second through hole 521 , so that the first through hole 14 communicates with the second through hole 521 .
  • the high-temperature and high-pressure gas can act on the first connection part 31 through the first through hole 14 and the second through hole 521, thereby quickly disconnecting the first connection part 31 from the current collecting member 50 Connection.
  • the end cover 30 further includes a second connection portion 33 , which surrounds the outside of the first connection portion 31 and is used for fixed connection with the housing 20 .
  • the weak portion 32 is located between the first connecting portion 31 and the second connecting portion 33 and is used for connecting the first connecting portion 31 and the second connecting portion 33 .
  • the second connecting portion 33 can be connected to the housing 20 by welding, clamping, bonding or other methods, so as to fix the end cover 30 on the housing 20 .
  • the second connecting portion 33 may be electrically connected to the housing 20 or may be insulatedly connected to the housing 20 .
  • the strength of the second connecting portion 33 is greater than that of the weak portion 32 ; for example, the thickness of the second connecting portion 33 is greater than the thickness of the weak portion 32 .
  • the end cover 30 is fixed to the housing 20 through the second connecting portion 33 surrounding the outer side of the weak portion 32, so as to increase the distance between the weak portion 32 and the housing 20 and reduce the stress transmitted to the weak portion 32.
  • the fatigue aging of the weak portion 32 is slowed down.
  • the weakened portion 32 is used to rupture and disconnect the connection between the first connecting portion 31 and the second connecting portion 33 when the internal pressure of the battery cell 7 reaches a threshold.
  • the first connecting part 31 and the second connecting part 33 can turn outwards under the action of internal pressure, so as to increase Large channels for releasing internal pressure, thereby quickly releasing internal pressure and improving safety.
  • the end cover 30 electrically connects the casing 20 to the first tab 11 , and the casing 20 can serve as an output pole of the battery cell 7 .
  • the weak portion 32 ruptures and disconnects the connection between the first connecting portion 31 and the second connecting portion 33, so that the connection between the electrode assembly 10 and the external circuit can be disconnected, and charging is stopped. Discharge, slow down the gas production of the electrode assembly 10, and improve safety.
  • the fixing structure 60 is configured such that when the internal pressure of the battery cell 7 reaches a threshold value, at least a part thereof is destroyed to disconnect the connection between the first connecting portion 31 and the first tab 11 . At the same time, with the rupture of the weak portion 32, the first connecting portion 31 is separated from the second connecting portion 33 under the action of air pressure, so as to increase the channel for releasing the internal pressure, thereby quickly releasing the internal pressure and improving safety.
  • the second connecting portion 33 includes a second plate 332 and a second protrusion 331 surrounding the outside of the second plate 332 , and the second protrusion 331 faces the electrode along the inner surface of the second plate 332 .
  • the direction of the assembly 10 protrudes, and a second concave portion 333 is formed on the second connecting portion 33 corresponding to the second convex portion 331 from the outer surface of the second plate body 332 along the direction facing the electrode assembly 10 .
  • the second plate body 332 surrounds the outer side of the weak portion 32 , and the second convex portion 331 is used for fixed connection with the housing 20 .
  • the second plate body 332 may be an annular flat plate structure, which has an inner surface and an outer surface oppositely disposed along the thickness direction Z, and the inner surface of the second plate body 332 faces the electrode assembly 10 .
  • the second convex portion 331 protrudes from the weakened portion 32 in a direction facing the electrode assembly 10 .
  • the second plate body 332 and the current collecting member 50 are at least partially overlapped in the thickness direction Z.
  • the second concave portion 333 can reduce the strength of the second convex portion 331 and improve the elasticity of the second convex portion 331. In this way, when the battery cell 7 vibrates, the stress on the casing 20 is transmitted to the second convex portion 331, and the second convex portion 331 The portion 331 can release stress through deformation, so as to reduce the stress transmitted to the weak portion 32 and slow down the fatigue aging of the weak portion 32 .
  • the weak portion 32 is located between the first board body 312 and the second board body 332 and connects the first board body 312 and the second board body 332 .
  • the outer surface 331 a of the second protrusion 331 abuts against the inner surface of the housing 20 and is used for welding with the housing 20 to close the opening 21 .
  • the outer surface 331 a of the second protrusion 331 is a surface of the second protrusion 331 facing the side wall 22 of the housing 20 .
  • the outer surface 331a of the second protrusion 331 is a cylindrical surface.
  • the outer surface 331a of the second protrusion 331 is a cylindrical surface.
  • the part of the second protrusion 331 protruding into the housing 20 can be interference fit, transition fit or clearance fit with the housing 20 .
  • the part of the second protrusion 331 protruding into the housing 20 can be interference fit with the housing 20 , and the interference fit can increase the connection strength between the housing 20 and the end cover 30 and improve the sealing performance.
  • the second protrusion 331 is connected to the side wall 22 of the casing 20 by laser welding.
  • the laser is irradiated at the junction of the second protrusion 331 and the side wall 22 , and the laser melts and connects at least part of the outer surface 331 a of the second protrusion 331 and part of the inner surface of the housing 20 together.
  • the outer surface 331 a of the second protrusion 331 abuts against the inner surface of the housing 20 , which can reduce the risk of burning the electrode assembly 10 when the laser beam enters the housing 20 .
  • the laser light can also be irradiated on the outer surface of the side wall 22 away from the second protrusion 331 .
  • welding can achieve sealing, reduce the risk of electrolyte leakage, and improve the connection strength and flow-through capacity between the second protrusion 331 and the housing 20 .
  • the second concave portion 333 can reduce the strength of the second convex portion 331 and improve the elasticity of the second convex portion 331. In this way, in the process of welding the second convex portion 331 and the housing 20, the second convex portion 331 can be deformed to release the welding. Stress, thereby reducing the risk of deformation and cracking in the welding area, reducing the welding stress transmitted to the weak portion 32, and improving safety.
  • the second protrusion 331 abuts against the first tab 11 to support the first tab 11 .
  • the second protrusion 331 supports the first tab 11 to reduce the shaking amplitude of the electrode assembly 10 when the battery cell 7 vibrates and improve the stability of the electrode assembly 10 .
  • the current collecting member 50 supports the middle area of the first tab 11, and the second protrusion 331 supports the edge area of the first tab 11, which can improve the uniformity of the force on the first tab 11 and reduce the pole pieces of the electrode assembly 10. Risk of offset, misalignment in the thickness direction Z.
  • the second protrusion 331 can support the first tab 11 and the current collecting member 50 to reduce the shielding of the current collecting member 50 to release the internal pressure.
  • the risk of the channel ensures smooth exhaust and improves safety.
  • FIG. 7 is a schematic partial cross-sectional view of the end cap shown in FIG. 4 .
  • the end cover 30 is provided with a groove 34 , and the area of the end cover 30 opposite to the groove 34 forms a weak portion 32 .
  • the thickness of the weak portion 32 is smaller than that of the first connecting portion, so that the strength of the weak portion 32 is smaller than that of the first connecting portion.
  • material may be removed from the end cap 30 by machining to form the groove 34 , which is beneficial to reduce processing cost and difficulty.
  • the weakened portion 32 and the groove 34 are correspondingly arranged.
  • the groove 34 may be disposed on the inner surface of the end cap 30 , and the weak portion 32 is a portion of the end cap 30 between the bottom surface of the groove 34 and the outer surface of the end cap 30 .
  • the groove 34 may also be provided on the outer surface of the end cover 30 , and the weak portion 32 is a portion of the end cover 30 between the bottom surface of the groove 34 and the inner surface of the end cover 30 .
  • the inner surface of the end cover 30 includes the inner surface of the first plate 312 and the inner surface of the second plate 332
  • the outer surface of the end cover 30 includes the outer surface of the first plate 312 and the second plate 332 of the outer surface.
  • the inner surface of the first board 312 is flush with the inner surface of the second board 332
  • the outer surface of the first board 312 is flush with the outer surface of the second board 332 .
  • the groove 34 is located between the first board body 312 and the second board body 332 .
  • the groove 34 is provided to reduce the thickness and strength of the weak portion 32 , so that the end cap 30 can rupture along the weak portion 32 when the internal pressure of the battery cell 7 reaches a threshold.
  • the end cap 30 includes a first nickel layer 30a, a steel layer 30b and a second nickel layer 30c, the first nickel layer 30a is disposed on the surface of the steel layer 30b facing the first lug, and the second nickel layer 30c is disposed The surface of the steel layer 30b away from the first tab.
  • the groove 34 is recessed from the surface of the first nickel layer 30a away from the steel layer 30b along the direction facing the second nickel layer 30c, and the depth of the groove 34 is greater than the thickness of the first nickel layer 30a, and smaller than the first nickel layer 30a and The sum of the thicknesses of the steel layers 30b.
  • the surface of the first nickel layer 30 a away from the steel layer 30 b is the inner surface of the end cover 30
  • the surface of the second nickel layer 30 c away from the steel layer 30 b is the outer surface of the end cover 30 .
  • the end cap 30 is made of metal composite panels.
  • the first nickel layer 30a and the second nickel layer 30c can protect the steel layer 30b, reduce the risk of the steel layer 30b being corroded by water, oxygen and other substances, and improve the sealing performance.
  • Both the thickness of the first nickel layer 30a and the equal thickness of the second nickel layer 30c are smaller than the thickness of the steel layer 30b.
  • the first nickel layer 30a and the second nickel layer 30c mainly play the role of anti-corrosion, which can have a small thickness; and the steel layer 30b is the base structure of the end cap 30, which can have a large thickness.
  • the groove 34 is located on the inner side of the end cap 30, and the outer second nickel layer 30c will not be damaged during the molding process, so the second nickel layer 30c can protect the steel layer 30b from the outside to reduce the steel layer 30b.
  • FIG. 8 is a schematic cross-sectional view of a battery cell provided by other embodiments of the present application;
  • FIG. 9 is an enlarged schematic view of the battery cell shown in FIG. 8 at box B.
  • the fixing structure 60 is a welding part formed by welding the first tab 11 and the first connecting part 31 .
  • the first connection portion 31 is directly connected to the first tab 11 by welding, which can simplify the structure of the battery cell 7 , for example, the current collecting member can be omitted.
  • FIG. 10 is a schematic flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application.
  • the manufacturing method of the battery cell in the embodiment of the present application includes:
  • the electrode assembly is provided with a first tab at one end facing the opening;
  • the end cover includes a first connecting part and a weak part, and the weak part is arranged along the edge of the first connecting part;
  • the end cap is configured to rupture along the weak portion when the internal pressure of the battery cell reaches a threshold value, so as to release the internal pressure.
  • Fig. 11 is a schematic block diagram of a battery cell manufacturing system provided by some embodiments of the present application.
  • the battery cell manufacturing system 90 of the embodiment of the present application includes:
  • the first providing device 91 is used to provide a casing, the casing has an opening;
  • the second providing device 92 is used to provide the electrode assembly and install the electrode assembly into the casing, and the electrode assembly is provided with a first tab at the end facing the opening;
  • the third providing device 93 is used to provide an end cover and connect the end cover to the housing so that the end cover covers the opening.
  • the end cover includes a first connecting portion and a weak portion, and the weak portion is along the edge of the first connecting portion. set up;
  • the assembly device 94 is used to fixedly connect the first connecting part to the first tab and form a fixed structure to limit the movement of the first connecting part;
  • the end cap is configured to rupture along the weak portion when the internal pressure of the battery cell reaches a threshold value, so as to release the internal pressure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本申请实施例提供一种电池单体及其制造方法和制造系统、电池以及用电装置。电池单体包括：壳体，具有开口；电极组件，容纳于壳体内，电极组件在面向开口的一端设有第一极耳；端盖，用于盖合开口，端盖包括第一连接部和薄弱部，薄弱部沿第一连接部的边缘设置，端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力。电池单体还包括固定结构，固定结构用于将第一连接部固定连接于第一极耳，以限制第一连接部的移动。本申请实施例可以降低端盖在电池单体正常使用情况下提前破裂泄压的风险，有利于提高电池单体的安全性和稳定性。

Description

电池单体及其制造方法和制造系统、电池以及用电装置 技术领域
本申请涉及电池技术领域，并且更具体地，涉及一种电池单体及其制造方法和制造系统、电池以及用电装置。
背景技术
电池单体广泛用于电子设备，例如手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具等等。电池单体可以包括镉镍电池单体、氢镍电池单体、锂离子电池单体和二次碱性锌锰电池单体等。
在电池技术的发展中，除了提高电池单体的性能外，安全问题也是一个不可忽视的问题。如果电池单体的安全问题不能保证，那该电池单体就无法使用。因此，如何增强电池单体的安全性，是电池技术中一个亟待解决的技术问题。
发明内容
本申请提供了一种电池单体及其制造方法和制造系统、电池以及用电装置，其能提高电池单体的安全性。
第一方面，本申请实施例提供了一种电池单体，包括：
壳体，具有开口；
电极组件，容纳于壳体内，电极组件在面向开口的一端设有第一极耳；
端盖，用于盖合开口，端盖包括第一连接部和薄弱部，薄弱部沿第一连接部的边缘设置，端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力；
其中，电池单体还包括固定结构，固定结构用于将第一连接部固定连接于第一极耳，以限制第一连接部的移动。
上述方案中，通过固定结构将端盖的第一连接部固定连接于电极组件的第一极耳，这样，电极组件的第一极耳能够在电池单体的使用过程中限制第一连接部的移动，从而减小端盖的变形和翻动，降低薄弱部所承载的交变应力，减缓端盖的薄弱部的疲劳老化，降低端盖在电池单体正常使用情况下提前破裂泄压的风险，有利于提高电池单体的安全性和稳定性。
在一些实施例中，第一连接部通过固定结构与第一极耳电连接。
上述方案中，端盖可以带电，其可以作为电池单体的输出极，从而省去一个传 统的电极端子，简化电池单体的结构。
在一些实施例中，固定结构被配置为在电池单体的内部压力达到阈值时至少一部分被破坏以断开第一连接部与第一极耳之间的连接。
上述方案中，在第一连接部与第一极耳之间的连接断开后，第一极耳不会再限制第一连接部的移动；随着薄弱部的破裂，第一连接部能够被气压冲开，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
在一些实施例中，固定结构为第一极耳与第一连接部焊接所形成的焊接部。
上述方案中，第一连接部与第一极耳通过焊接直接连接，这样可以简化电池单体的结构。
在一些实施例中，电池单体还包括集流构件，设于端盖与第一极耳之间，集流构件用于连接第一连接部和第一极耳，以实现端盖和第一极耳的电连接。固定结构包括第一固定结构和第二固定结构，第一固定结构为集流构件的一部分与第一极耳焊接所形成的焊接部，第二固定结构为集流构件的另一部分与第一连接部焊接所形成的焊接部。
上述方案中，通过在电池单体中设置集流构件，并将集流构件与第一连接部、第一极耳分别焊接，以实现端盖和第一极耳的电连接。集流构件可以与第一连接部紧密贴合，以降低第一连接部产生微裂纹的风险，提高密封性能，减少安全隐患。
在一些实施例中，集流构件包括第一集流部和第二集流部，第一集流部环绕在第二集流部的外侧，第一固定结构为第一集流部与第一极耳焊接所形成的焊接部，第二固定结构为第二集流部与第一连接部焊接所形成的焊接部。
上述方案中，第一固定结构和第二固定结构分别形成于第一集流部和第二集流部，这样可以避免第一固定结构影响第一连接部和集流构件的焊接，提高第一连接部和集流构件的连接强度。
在一些实施例中，第二固定结构被配置为在电池单体的内部压力达到阈值时被破坏以断开第二集流部与第一连接部之间的连接。
上述方案中，在第一连接部与第二集流部之间的连接断开后，第一极耳不会再通过集流构件限制第一连接部的移动；随着薄弱部的破裂，第一连接部能够被气压冲开，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
在一些实施例中，第二集流部与第一连接部的连接强度小于第一集流部与第一极耳的连接强度。
上述方案中，在电池单体出现热失控时，端盖在气压的作用下对集流构件和第一极耳施加拉力；由于第二集流部与第一连接部的连接强度小于第一集流部与第一极耳的连接强度，所以集流构件会先与第一连接部分离；集流构件会与第一连接部分离后，集流构件不会受到端盖的拉力，这样可以保持集流构件与第一极耳的固定连接，降低集流构件阻塞用于泄放内部压力的通道的风险。
在一些实施例中，第一连接部包括第一凸部和环绕在第一凸部外侧的第一板体，第一凸部从第一板体的内表面沿面向电极组件的方向凸出，第一连接部上与第一凸部相对应的位置形成有从第一板体的外表面沿面向电极组件的方向凹陷的第一凹部。薄 弱部位于第一板体的外侧，并沿着第一板体的外边缘设置。第二集流部与第一凸部相抵并焊接，以形成第二固定结构。
上述方案中，第一凹部能够降低第一凸部的强度，提高第一凸部的弹性，这样，在电池单体震动时，第一凸部能够通过变形释放应力，以减小传递到薄弱部的应力，减缓薄弱部的疲劳老化。第一凹部还能够减小第一凸部的厚度，降低焊接第一凸部和第二集流部所需的能量，减少传递到薄弱部的热量，减缓薄弱部的疲劳老化。
在一些实施例中，第一集流部在端盖的厚度方向上覆盖薄弱部。
上述方案中，集流构件可以将薄弱部与第一极耳隔开，以减少掉落到薄弱部上的电极组件中的活性颗粒，降低薄弱部被腐蚀的风险。
在一些实施例中，第一凸部支撑集流构件，以在第一集流部和端盖之间形成用于避让薄弱部的避让空隙。
上述方案中，第一连接部通过集流构件支撑第一极耳，以减小电极组件在电池单体震动时的晃动幅度，提高电极组件的稳定性。避让空隙可以将薄弱部与第一集流部隔开，以避免第一集流部在薄弱部破裂时堵塞用于泄放内部压力的通道，提高安全性。
在一些实施例中，电极组件为卷绕式结构，电极组件在卷绕中心处具有第一通孔。第二集流部设置有第二通孔，第二通孔被配置为与第一通孔相对设置，以将电极组件内的气体引导至第一连接部。
上述方案中，当电极组件热失控时，高温高压气体能够经由第一通孔和第二通孔作用在第一连接部上，从而快速的断开第一连接部和集流构件之间的连接。
在一些实施例中，端盖还包括第二连接部，第二连接部环绕在第一连接部的外侧并用于与壳体固定连接。薄弱部位于第一连接部和第二连接部之间并用于连接第一连接部和第二连接部。
上述方案中，端盖通过环绕在薄弱部外侧的第二连接部固定于壳体，以增大薄弱部与壳体的间距，减少传递到薄弱部的应力，减缓薄弱部的疲劳老化。
在一些实施例中，薄弱部用于在电池单体的内部压力达到阈值时破裂并断开第一连接部和第二连接部之间的连接。
上述方案中，在第一连接部和第二连接部之间的连接断开后，第一连接部和第二连接部在内部压力的作用下可以向外翻转，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
在一些实施例中，第二连接部包括第二板体和环绕在第二板体外侧的第二凸部，第二凸部从第二板体的内表面沿面向电极组件的方向凸出，第二连接部上与第二凸部相对应的位置形成有从第二板体的外表面沿面向电极组件的方向凹陷的第二凹部。第二板体环绕在薄弱部的外侧，第二凸部用于与壳体固定连接。
上述方案中，第二凹部能够降低第二凸部的强度，提高第二凸部的弹性，这样，在电池单体震动时，壳体上的应力传递到第二凸部，第二凸部能够通过变形释放应力，以减小传递到薄弱部的应力，减缓薄弱部的疲劳老化。
在一些实施例中，第二凸部的外侧面抵接于壳体的内表面并用于与壳体焊接， 以封闭开口。
上述方案中，焊接可以实现密封，降低电解液泄露的风险，并提高第二凸部和壳体之间的连接强度和过流能力。第二凹部能够降低第二凸部的强度，提高第二凸部的弹性，这样，在焊接第二凸部和壳体的过程中，第二凸部可以通过变形释放焊接应力，从而降低焊接区域变形、开裂的风险，减少传递到薄弱部的焊接应力，提高安全性。
在一些实施例中，第二凸部与第一极耳相抵，以支撑第一极耳。
上述方案中，第二凸部支撑第一极耳，以减小电极组件在电池单体震动时的晃动幅度，提高电极组件的稳定性。
在一些实施例中，薄弱部环绕第一连接部一圈。
上述方案中，薄弱部环绕第一连接部一圈，这样可以增大薄弱部的范围，在薄弱部破裂时增大排气速率，提高安全性。
在一些实施例中，端盖设有凹槽，端盖与凹槽相对的区域形成薄弱部。
上述方案中，通过设置凹槽来减小薄弱部的厚度和强度，从而使端盖能够在在电池单体的内部压力达到阈值时沿薄弱部破裂。
在一些实施例中，端盖包括第一镍层、钢层和第二镍层，第一镍层设置于钢层面向第一极耳的表面，第二镍层设置于钢层背离第一极耳的表面。凹槽从第一镍层的背离钢层的表面沿面向第二镍层的方向凹陷，且凹槽的深度大于第一镍层的厚度，且小于第一镍层和钢层的厚度之和。
上述方案中，凹槽位于端盖的内侧，在成型过程中不会破坏外部的第二镍层，所以第二镍层能够从外侧保护钢层，以降低钢层被腐蚀的风险；钢层本身不易被电解液腐蚀，因此，即使凹槽将钢层露出，也不易引发安全风险。
在一些实施例中，端盖用于将第一极耳电连接于壳体。
上述方案中，壳体本身可以作为电池单体的输出极，在多个电池单体装配成组时，壳体可以与汇流部件电连接，这样既可以增大过流面积，还可以使汇流部件的结构设计更为灵活。
在一些实施例中，壳体还包括侧壁和连接于侧壁的底壁，侧壁沿端盖的厚度方向延伸并环绕电极组件的外周设置，底壁设有电极引出孔。电极组件还包括与第一极耳极性相反的第二极耳，第二极耳设于电极组件背离开口的一端。电池单体还包括安装于电极引出孔的电极端子，电极端子电连接于第二极耳。
上述方案中，底壁和电极端子可以作为电池单体的两个输出极，这样可以简化电池单体的结构，并保证电池单体的过流能力。底壁和电极端子位于电池单体的同一端，这样，在将多个电池单体装配成组时，汇流部件可以装配到电池单体的同一侧，这样可以简化装配工艺，提高装配效率。
在一些实施例中，底壁和侧壁为一体形成结构。
上述方案可以省去底壁和侧壁的连接工序。
在一些实施例中，第一极耳为负极极耳，壳体的基体材质为钢。
上述方案中，壳体与负极极耳电连接，即壳体处于低电位状态。钢制的壳体在 低电位状态下不易被电解液腐蚀，以降低安全风险。
在一些实施例中，电池单体为圆柱电池单体。
第二方面，本申请实施例提供了一种电池，包括多个第一方面任一实施例的电池单体。
第三方面，本申请实施例提供了一种用电装置，包括第二方面的电池，电池用于提供电能。
第四方面，本申请实施例提供了一种电池单体的制造方法，包括：
提供壳体，壳体具有开口；
提供电极组件，并将电极组件安装到壳体内，电极组件在面向开口的一端设有第一极耳；
提供端盖，并将端盖连接于壳体，以使端盖盖合于开口，端盖包括第一连接部和薄弱部，薄弱部沿第一连接部的边缘设置；
将第一连接部固定连接于第一极耳并形成固定结构，以限制第一连接部的移动；
其中，端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力。
第五方面，本申请实施例提供了电池单体的制造系统，包括：
第一提供装置，用于提供壳体，壳体具有开口；
第二提供装置，用于提供电极组件，并将电极组件安装到壳体内，电极组件在面向开口的一端设有第一极耳；
第三提供装置，用于提供端盖，并将端盖连接于壳体，以使端盖盖合于开口，端盖包括第一连接部和薄弱部，薄弱部沿第一连接部的边缘设置；
组装装置，用于将第一连接部固定连接于第一极耳并形成固定结构，以限制第一连接部的移动；
其中，端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本申请一些实施例提供的车辆的结构示意图；
图2为本申请一些实施例提供的电池的爆炸示意图；
图3为图2所示的电池模块的爆炸示意图；
图4为本申请一些实施例提供的电池单体的爆炸示意图；
图5为本申请一些实施例提供的电池单体的剖视示意图；
图6为图5所示的电池单体在圆框A处的放大示意图；
图7为图4所示的端盖的局部剖视示意图；
图8为本申请另一些实施例提供的电池单体的剖视示意图；
图9为图8所示的电池单体在方框B处的放大示意图；
图10为本申请一些实施例提供的电池单体的制造方法的流程示意图；
图11为本申请一些实施例提供的电池单体的制造系统的示意性框图。
在附图中，附图并未按照实际的比例绘制。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中，电池单体可以包括锂离子二次电池单体、锂离子一次电池单体、锂硫电池单体、钠锂离子电池单体、钠离子电池单体或镁离子电池单体等，本申请实施 例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件包括正极极片、负极极片和隔离件。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面；正极集流体包括正极涂覆区和连接于正极涂覆区的正极极耳，正极涂覆区涂覆有正极活性物质层，正极极耳未涂覆正极活性物质层。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质层包括正极活性物质，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面；负极集流体包括负极涂覆区和连接于负极涂覆区的负极极耳，负极涂覆区涂覆有负极活性物质层，负极极耳未涂覆负极活性物质层。负极集流体的材料可以为铜，负极活性物质层包括负极活性物质，负极活性物质可以为碳或硅等。隔离件的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
电池单体还包括壳体和端盖，壳体具有开口且用于容纳电极组件，电极组件可以经由壳体的开口装配到壳体内。端盖用于盖合于壳体的开口以实现密封。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的安全性。
电池单体上的泄压机构对电池单体的安全性有着重要影响。例如，当发生短路、过充等现象时，可能会导致电池单体内部发生热失控从而压力骤升。这种情况下通过泄压机构致动可以将内部压力向外释放，以防止电池单体爆炸、起火。
泄压机构是指在电池单体的内部压力达到预定阈值时致动以泄放内部压力的元件或部件。该阈值设计根据设计需求不同而不同。该阈值可能取决于电池单体中的正极极片、负极极片、电解液和隔离件中一种或几种的材料。
泄压机构可以采用诸如防爆阀、气阀、泄压阀或安全阀等的形式，并可以具体采用压敏元件或构造，即，当电池单体的内部压力达到预定阈值时，泄压机构执行动作或者泄压机构中设有的薄弱部破裂，从而形成可供内部压力泄放的开口或通道。
本申请中所提到的“致动”是指泄压机构产生动作或被激活至一定的状态，从而使得电池单体的内部压力得以被泄放。泄压机构产生的动作可以包括但不限于：泄压机构中的至少一部分破裂、破碎、被撕裂或者打开，等等。泄压机构在致动时，电池单体的内部的高温高压物质作为排放物会从致动的部位向外排出。以此方式能够在可控压力的情况下使电池单体发生泄压，从而避免潜在的更严重的事故发生。
本申请中所提到的来自电池单体的排放物包括但不限于：电解液、被溶解或分裂的正负极极片、隔离件的碎片、反应产生的高温高压气体、火焰，等等。
为了简化电池单体的结构，发明人尝试将泄压机构集成到端盖上。例如，发明 人在端盖上设置薄弱部，而端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力。当发生短路、过充等现象时，可能会导致电池单体内部发生热失控从而压力骤升，这种情况下通过薄弱部的破裂可以将内部压力向外释放，以防止电池单体爆炸、起火，从而提高安全性。
然而，发明人发现电池单体在内部压力未达到预定阈值时就发生爆破泄压的问题之后，对电池单体的结构和使用环境进行了分析和研究。发明人发现，端盖的薄弱部存在提前疲劳老化的情况，从而导致端盖的打开阈值下降，在电池单体内部压力还未达到原预定阈值时，端盖的薄弱部会提前发生破裂。在进一步研究之后发现，电池单体在运输、温度变化或充放电的过程中，电池单体的内部压力存在高低交替变化的情况，从而导致端盖存在往复翻动的情况。端盖长期往复翻动时，会导致薄弱部出现疲劳老化，从而导致端盖的打开阈值下降。
鉴于此，本申请实施例提供一种技术方案，通过将端盖固定于电极组件的极耳来限制端盖的翻动，减小薄弱部所承载的交变应力，减缓端盖的薄弱部的疲劳老化，降低端盖提前破裂泄压的风险，有利于提高电池单体的安全性和稳定性。
本申请实施例描述的技术方案适用于电池以及使用电池的用电装置。
用电装置可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电装置不做特殊限制。
以下实施例为了方便说明，以用电装置为车辆为例进行说明。
图1为本申请一些实施例提供的车辆的结构示意图。如图1所示，车辆1的内部设置有电池2，电池2可以设置在车辆1的底部或头部或尾部。电池2可以用于车辆1的供电，例如，电池2可以作为车辆1的操作电源。
车辆1还可以包括控制器3和马达4，控制器3用来控制电池2为马达4供电，例如，用于车辆1的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池2不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，代替或部分地代替燃油或天然气为车辆1提供驱动动力。
图2为本申请一些实施例提供的电池的爆炸示意图。如图2所示，电池2包括箱体5和电池单体(图2未示出)，电池单体容纳于箱体5内。
箱体5用于容纳电池单体，箱体5可以是多种结构。在一些实施例中，箱体5可以包括第一箱体部5a和第二箱体部5b，第一箱体部5a与第二箱体部5b相互盖合，第一箱体部5a和第二箱体部5b共同限定出用于容纳电池单体的容纳空间5c。第二箱体部5b可以是一端开口的空心结构，第一箱体部5a为板状结构，第一箱体部5a盖合于第二箱体部5b的开口侧，以形成具有容纳空间5c的箱体5；第一箱体部5a和第二 箱体部5b也均可以是一侧开口的空心结构，第一箱体部5a的开口侧盖合于第二箱体部5b的开口侧，以形成具有容纳空间5c的箱体5。当然，第一箱体部5a和第二箱体部5b可以是多种形状，比如，圆柱体、长方体等。
为提高第一箱体部5a与第二箱体部5b连接后的密封性，第一箱体部5a与第二箱体部5b之间也可以设置密封件，比如，密封胶、密封圈等。
假设第一箱体部5a盖合于第二箱体部5b的顶部，第一箱体部5a亦可称之为上箱盖，第二箱体部5b亦可称之为下箱体。
在电池2中，电池单体可以是一个，也可以是多个。若电池单体为多个，多个电池单体之间可串联或并联或混联，混联是指多个电池单体中既有串联又有并联。多个电池单体之间可直接串联或并联或混联在一起，再将多个电池单体构成的整体容纳于箱体5内；当然，也可以是多个电池单体先串联或并联或混联组成电池模块6，多个电池模块6再串联或并联或混联形成一个整体，并容纳于箱体5内。
图3为图2所示的电池模块的爆炸示意图。
在一些实施例中，如图3所示，电池单体7为多个，多个电池单体7先串联或并联或混联组成电池模块6。多个电池模块6再串联或并联或混联形成一个整体，并容纳于箱体内。
电池模块6中的多个电池单体7之间可通过汇流部件实现电连接，以实现电池模块6中的多个电池单体7的并联或串联或混联。
图4为本申请一些实施例提供的电池单体的爆炸示意图；图5为本申请一些实施例提供的电池单体的剖视示意图；图6为图5所示的电池单体在圆框A处的放大示意图。
如图4至图6所示，本申请实施例的电池单体7包括：壳体20，具有开口21；电极组件10，容纳于壳体20内，电极组件10在面向开口21的一端设有第一极耳11；端盖30，用于盖合开口21，端盖30包括第一连接部31和薄弱部32，薄弱部32沿第一连接部31的边缘设置，端盖30被配置为在电池单体7的内部压力达到阈值时沿薄弱部32破裂，以泄放内部压力。电池单体7还包括固定结构60，固定结构60用于将第一连接部31固定连接于第一极耳11，以限制第一连接部31的移动。
电极组件10包括第一极片、第二极片和隔离件，隔离件用于将第一极片和第二极片隔开。第一极片和第二极片的极性相反，换言之，第一极片和第二极片中的一者为正极极片，第一极片和第二极片中的另一者为负极极片。
可选地，第一极片、第二极片和隔离件均为带状结构，第一极片、第二极片和隔离件卷绕为一体并形成卷绕结构。卷绕结构可以为圆柱状结构、扁平状结构或其它形状的结构。
从电极组件10的外形看，电极组件10包括主体部12、第一极耳11和第二极耳13，第一极耳11和第二极耳13凸出于主体部12。第一极耳11为第一极片的未涂覆活性物质层的部分，第二极耳13为第二极片的未涂覆活性物质层的部分。对应地，第一极耳11和第二极耳13中的一者为正极性的极耳，另一者为负极性的极耳。
第一极耳11和第二极耳13可以从主体部12的同一侧伸出，也可以分别从相反 的两侧延伸出。
示例性地，第一极耳11和第二极耳13分别设于主体部12的两侧，换言之，第一极耳11和第二极耳13分别设于电极组件10的两端。可选地，第一极耳11位于电极组件10的面向端盖30的一端，第二极耳13位于电极组件10的背离端盖30的一端。
可选地，第一极耳11环绕电极组件10的中心轴线X卷绕为多圈，换言之，第一极耳11包括多圈极耳层。在卷绕完成后，第一极耳11大体为柱体状，相邻的两圈极耳层之间留有缝隙。本申请实施例可以对第一极耳11进行处理，以减小极耳层间的缝隙，便于第一极耳11与其它电结构连接。例如，本申请实施例可对第一极耳11进行揉平处理，以使第一极耳11的远离主体部12的端部区域收拢、集合在一起；揉平处理在第一极耳11远离主体部12的一端形成致密的端面，减小极耳层间的缝隙，便于第一极耳11与其它导电结构连接。可替代地，本申请实施例也可以在相邻的两圈极耳层之间填充导电材料，以减小极耳层间的缝隙。
可选地，第二极耳13环绕电极组件10的中心轴线X卷绕为多圈，第二极耳13包括多圈极耳层。示例性地，且第二极耳13也经过了揉平处理，以减小第二极耳13的极耳层间的缝隙。
壳体20可以为一侧开口的空心结构，也可以是两侧开口的空心结构。端盖30盖合于壳体20的开口处并形成密封连接，以形成用于容纳电极组件和电解液的容纳腔。
壳体20可以是多种形状，比如，圆柱体、长方体等。壳体20的形状可根据电极组件10的具体形状来确定。比如，若电极组件10为圆柱体结构，则可选用为圆柱体壳体；若电极组件10为长方体结构，则可选用长方体壳体。
示例性地，壳体20包括侧壁22和底壁23，侧壁22环绕在电极组件10的外侧，底壁23连接于侧壁22的端部。侧壁22为筒状结构，例如，侧壁22可为圆筒或方筒；底壁23为板状结构，其形状与侧壁22的形状相对应。可选地，侧壁22的一端形成开口21，底壁23连接于侧壁22的背离开口21的另一端。
侧壁22和底壁23可为一体形成结构，即壳体20为一体成形的构件。当然，侧壁22和底壁23也可以为分开提供的两个构件，然后通过焊接、铆接、粘接等方式连接在一起。
端盖30可以电连接于电极组件10，也可以与电极组件10绝缘设置。可选地，端盖30电连接于第一极耳11。当然，端盖30可以直接电连接于第一极耳11，也可以通过其它导电构件电连接到第一极耳11。
端盖30固定地连接于壳体20。例如，端盖30可通过焊接、卡接、粘接或其它方式连接于壳体20，以将端盖30固定在壳体20上。端盖30可以电连接于壳体20，也可以绝缘地连接于壳体20。
壳体20可以带正电、可以带负电、也可以不带电。当壳体20需要带电时，壳体20可以直接与电极组件10的极耳连接，也可以通过其它导电构件(例如端盖30)与极耳电连接。
端盖30和壳体20可通过焊接的方式相连，这样，端盖30和壳体20可带有相同的极性。示例性地，当壳体20需要带正电时，可利用端盖30将壳体20电连接到正 极性的极耳；当壳体20需要带负电时，可利用端盖30将壳体20电连接到负极性的极耳。当然，壳体20也可通过其它导电结构连接到极耳，本实施例对此不作限制。
壳体20和端盖30可以由相同的材料制成，也可以由不同的材料制成。
薄弱部32的强度相对于端盖30的其它部分的强度偏弱，薄弱部32是端盖30的易于破裂、破碎、被撕裂或者打开的部分。本实施例可以通过对端盖30的预定区域进行减薄处理以形成薄弱部32、通过对端盖30的预定区域进行材料处理以形成薄弱部32、通过对端盖30的预定区域进行加热处理以形成薄弱部32或通过其它方式在端盖30的预定区域形成薄弱部32。
薄弱部32沿第一连接部31的周向延伸并连接于第一连接部31的边缘。示例性地，薄弱部32可以环绕第一连接部31一圈，也可以仅环绕第一连接部1/2圈、2/3圈或3/4圈，本实施例对此不作限制。
固定结构60可以将第一连接部31直接固定连接于第一极耳11，也可以通过其它构件间接地将第一连接部31固定连接于第一极耳11。
固定结构60可以为焊接形成的焊接部，也可以为粘接剂固化后的粘接层，还可以是其它结构，只要能够实现第一极耳11与第一连接部31之间的固定连接即可。
固定结构60可以是导电结构，以将第一连接部31电连接于第一极耳11；当然，可替代地，固定结构60也可以是绝缘结构，以将第一连接部31与第一极耳11绝缘隔离。
固定结构60的强度可以根据需求设定。在电池单体7的内部压力达到阈值时，固定结构60可以在内部压力的作用下被破坏，以断开第一连接部31与第一极耳11之间的连接。当然，固定结构60也可以具有较大的强度，在电池单体7的内部压力达到阈值，固定结构60能够保持第一连接部31与第一极耳11之间的连接。
电池单体在运输、温度变化或充放电的过程中，电池单体的内部压力存在高低交替变化的情况，从而使得端盖存在朝远离电极组件的方向隆起或者朝靠近电极组件的方向凹陷的变形情况。端盖在隆起变形和凹陷变形交替出现时，薄弱部会承载交变应力而发生交变疲劳老化或断裂，从而导致薄弱部强度下降，进而容易在电池单体的内部压力还未达到预设的阈值时，薄弱部就会破裂以泄放电池单体的内部压力，导致端盖提前破裂泄压。
本申请实施例通过固定结构60将端盖30的第一连接部31固定连接于电极组件10的第一极耳11，这样，电极组件10的第一极耳11能够在电池单体7的使用过程中限制第一连接部31的移动，从而减小端盖30的变形和翻动，降低薄弱部32所承载的交变应力，减缓端盖30的薄弱部32的疲劳老化，降低端盖30在电池单体7正常使用情况下提前破裂泄压的风险，有利于提高电池单体7的安全性和稳定性。
在一些实施例中，端盖30为一体形成结构。
在一些实施例中，薄弱部32环绕第一连接部31一圈。
薄弱部32为环绕在第一连接部31的外侧的环形结构，其形状与第一连接部31的轮廓相对应。第一连接部31位于薄弱部32所围成的区域内。可选地，薄弱部32所围成的区域可以为圆形、矩形、跑道形或椭圆形。
本实施例的薄弱部32环绕第一连接部31一圈，这样可以增大薄弱部32的范围，在薄弱部32破裂时增大排气速率，提高安全性。
在一些实施例中，第一连接部31通过固定结构60与第一极耳11电连接。
固定结构60具有导电性，其能够实现端盖30和第一极耳11的电连接。
本实施例中，端盖30可以带电，其可以作为电池单体7的输出极，从而省去一个传统的电极端子，简化电池单体7的结构。
在一些实施例中，端盖30用于将第一极耳11电连接于壳体20。
在本实施例中，壳体20本身可以作为电池单体7的输出极。在多个电池单体7装配成组时，壳体20可以与汇流部件电连接，这样既可以增大过流面积，还可以使汇流部件的结构设计更为灵活。
在一些实施例中，壳体20还包括侧壁22和连接于侧壁22的底壁23，侧壁22沿端盖30的厚度方向Z延伸并环绕电极组件10的外周设置，底壁23设有电极引出孔231。电极组件10还包括与第一极耳11极性相反的第二极耳13，第二极耳13设于电极组件10背离开口21的一端。电池单体7还包括安装于电极引出孔231的电极端子40，电极端子40电连接于第二极耳13。
第二极耳13可以直接电连接于电极端子40，也可以通过其它导电结构间接地电连接于电极端子40。
电极端子40绝缘设置于底壁23，电极端子40和底壁23可以具有不同的极性，电极端子40和底壁23可以分别作为电池单体7的两个输出极。
在第一极耳11为负极极耳、第二极耳13为正极极耳时，底壁23为电池单体7的负输出极，而电极端子40为电池单体7的正输出极。在第一极耳11为正极极耳、第二极耳13为负极极耳时，底壁23为电池单体7的正输出极，而电极端子40为电池单体7的负输出极。
电极端子40固定于底壁23。电极端子40可以整体固定在底壁23的外侧，也可以通过电极引出孔231伸入到壳体20的内部。
第一极耳11位于电极组件10的面向端盖30的一端，以便于端盖30与第一极耳11电连接；对应地，第二极耳13位于电极组件10的面向底壁23的一端，以便于电极端子40与第二极耳13电连接。本申请实施例将第一极耳11和第二极耳13设于电极组件10的两端，可以降低第一极耳11和第二极耳13导通的风险，并增大第一极耳11的过流面积和第二极耳13的过流面积。
在本实施例中，底壁23和电极端子40可以作为电池单体7的两个输出极，这样可以简化电池单体7的结构，并保证电池单体7的过流能力。底壁23和电极端子40位于电池单体7的同一端，这样，在将多个电池单体7装配成组时，汇流部件可以装配到电池单体7的同一侧，这样可以简化装配工艺，提高装配效率。
在一些实施例中，底壁23和侧壁22为一体形成结构。本实施例可以省去底壁23和侧壁22的连接工序。壳体20可通过拉伸工艺成型。
本申请实施例的电极引出孔231是在壳体20拉伸成型后制成。
发明人曾尝试辊压的壳体的开口端，以使壳体的开口端向内翻折并形成翻边结 构，翻边结构压住端盖以实现端盖的固定。发明人将电极端子安装到端盖上，并以翻边结构和电极端子作为电池单体的两个输出极。然而，翻边结构的尺寸越大，其在成型后出现卷曲和褶皱的风险越高；如果翻边结构出现卷曲和褶皱，那么会造成翻边结构的表面不平整，当翻边结构与汇流部件焊接时，会存在焊接不良的问题。因此，翻边结构的尺寸比较受限，造成电池单体的过流能力不足。
本实施例利用开孔的工艺在底壁23上形成用于安装电极端子40的电极引出孔231，以将正输出极和负输出极设置在电池单体7的背离开口21的一端；底壁23是在壳体20的成型过程中形成，开设电极引出孔231后也能够保证底壁23的平整性，保证底壁23和汇流部件的连接强度。同时，底壁23的平整性不受自身尺寸的约束，所以底壁23可以具有较大的尺寸，从而提高电池单体7的过流能力。
在一些实施例中，第一极耳11为负极极耳，壳体20的基体材质为钢。
壳体20与负极极耳电连接，即壳体20处于低电位状态。钢制的壳体20在低电位状态下不易被电解液腐蚀，以降低安全风险。
在一些实施例中，壳体20焊接于端盖30。焊接既可以实现壳体20和端盖30的连接，提高壳体20和端盖30之间的过流能力，还能保证密封性。
在一些实施例中，壳体20的基体材质和端盖30的基体材质相同。可选地，壳体20的基体材质与端盖30的基体材质均为钢。
本实施例中，壳体20的基体材质和端盖30的基体材质相同，这样可以保证壳体20和端盖30的焊接强度，保证电池单体7的密封性。
在一些实施例中，电池单体7为圆柱电池单体。对应地，电极组件10为圆柱结构，壳体20为圆柱状的中空结构。
在一些实施例中，固定结构60被配置为在电池单体7的内部压力达到阈值时至少一部分被破坏以断开第一连接部31与第一极耳11之间的连接。
在电池单体7出现热失控时，电极组件10会产生高温高压气体，而电池单体7的内部压力随着气体的增加而增大。端盖30在气压的作用下变形，并对固定结构60施加拉力。在电池单体7的内部压力达到阈值时，端盖30在气压的作用下将固定结构60拉断，以断开第一连接部31与第一极耳11之间的固定连接。
本实施例对固定结构60的破裂与薄弱部32的破裂的顺序不作限定，只要在电池单体7的内部压力达到该阈值时，固定结构60与薄弱部32均能够破裂即可。
在本实施例中，在第一连接部31与第一极耳11之间的连接断开后，第一极耳11不会再限制第一连接部31的移动；随着薄弱部32的破裂，第一连接部31能够被气压冲开，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
示例性地，薄弱部32环绕第一连接部31一圈；在薄弱部32的破裂后，第一连接部31与端盖30的其它部分的连接断开，这样，第一连接部31在气压的作用下冲开并脱离电池单体7。可替代地，薄弱部32也可环绕第一连接部31不足一圈，随着薄弱部32的破裂，第一连接部31仍然与端盖30的其它部分的保持连接；但是，在气压的作用下，第一连接部31会向外翻转，以增大用于泄放内部压力的通道。
在一些实施例中，电池单体7还包括集流构件50，设于端盖30与第一极耳11 之间，集流构件50用于连接第一连接部31和第一极耳11，以实现端盖30和第一极耳11的电连接。固定结构60包括第一固定结构61和第二固定结构62，第一固定结构61为集流构件50的一部分与第一极耳11焊接所形成的焊接部，第二固定结构62为集流构件50的另一部分与第一连接部31焊接所形成的焊接部。
集流构件50的一部分通过焊接的方式连接于第一极耳11，以实现集流构件50与第一极耳11的电连接。集流构件50的另一部分通过焊接的方式连接于第一连接部31，以实现集流构件50与端盖30的电连接。
除了焊接于第一极耳11的一部分和焊接于第一连接部31的另一部分之外，集流构件50还可包括其它的部分。
发明人经过研究发现，第一极耳11的面向端盖30的端面不平整，难以与第一连接部31紧密贴合，如果直接焊接第一连接部31和第一极耳11，第一连接部31可能会产生微裂纹，引发端盖30密封失效的风险，造成安全隐患。
在本实施例中，集流构件50为独立成型的构件，其不同于卷绕成形的第一极耳11，集流构件50的形状可以根据端盖30的形状适应性的调整，以保证集流构件50能够紧贴于端盖30的第一连接部31。
本实施例通过在电池单体7中设置集流构件50，并将集流构件50与第一连接部31、第一极耳11分别焊接，以实现端盖30和第一极耳11的电连接。集流构件50可以与第一连接部31紧密贴合，以降低第一连接部31产生微裂纹的风险，提高密封性能，减少安全隐患。集流构件50与第一极耳11焊接时，即使集流构件50产生微裂纹，也不会影响电池单体7的密封性。
在本实施例中，第一固定结构61和第二固定结构62能够将第一连接部31、集流构件50和第一极耳11固定连接，以限制第一连接部31的移动。
在一些实施例中，集流构件50包括第一集流部51和第二集流部52，第一集流部51环绕在第二集流部52的外侧，第一固定结构61为第一集流部51与第一极耳11焊接所形成的焊接部，第二固定结构62为第二集流部52与第一连接部31焊接所形成的焊接部。
第一集流部51为环绕在第二集流部52的外侧的环形结构。可选地，集流构件50的与第一连接部31接触的部分为第二集流部52，集流构件50的不与第一连接部31接触的部分为第一集流部51。
第一固定结构61位于第二固定结构62的外侧，即第一固定结构61比第二固定结构62更靠近壳体20的侧壁22。
第一固定结构61和第二固定结构62是材料经过熔化、冷却凝固等过程之后形成的结构，两者的表面凹凸不平。
在装配电池单体7时，先将集流构件50抵压并焊接于第一极耳11以形成第一固定结构61，然后再焊接第一连接部31和集流构件50以形成第二固定结构62。如果第二固定结构62与第一固定结构61沿端盖30的厚度方向Z重叠，那么在焊接第一连接部31和集流构件50时，第一连接部31的用于与集流构件50的焊接的部分需要抵压在第一固定结构61上。由于第一固定结构61的表面凹凸不平，如果第一连接部31的 用于与集流构件50的焊接的部分抵压在第一固定结构61上，那么第一连接部31难以和第一固定结构61紧密贴合，这样会造成焊接不良，影响第一连接部31和集流构件50的连接强度，并引发第一连接部31形成微裂纹的风险。
在本实施例中，第一固定结构61和第二固定结构62分别形成于第一集流部51和第二集流部52，这样可以避免第一固定结构61影响第一连接部31和集流构件50的焊接，提高第一连接部31和集流构件50的连接强度。
在一些实施例中，第二固定结构62被配置为在电池单体7的内部压力达到阈值时被破坏以断开第二集流部52与第一连接部31之间的连接。
在电池单体7出现热失控时，电极组件10会产生高温高压气体，而电池单体7的内部压力随着气体的增加而增大。端盖30在气压的作用下变形，并对第二固定结构62施加拉力。在电池单体7的内部压力达到阈值时，端盖30在气压的作用下将第二固定结构62拉断，以断开第一连接部31与第二集流部52之间的固定连接。
在第一连接部31与第二集流部52之间的连接断开后，第一极耳11不会再通过集流构件50限制第一连接部31的移动；随着薄弱部32的破裂，第一连接部31能够被气压冲开，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
在一些实施例中，在电池单体7的内部压力达到阈值时，第一固定结构61会保持第一极耳11和第一集流部51的连接，以固定集流构件50，降低集流构件50阻塞用于泄放内部压力的通道的风险。
在一些实施例中，第二集流部52与第一连接部31的连接强度小于第一集流部51与第一极耳11的连接强度。
第二集流部52与第一连接部31的连接强度可用第二固定结构62的抗拉强度表征，第一集流部51与第一极耳11的连接强度可用第一固定结构61的抗拉强度表征。第一固定结构61的抗拉强度和第二固定结构62的抗拉强度可利用拉力试验机测试。例如，可将电极组件10固定在夹具上，拉力试验机拉动集流构件50，以将第一固定结构61拉断并分离电极组件10的第一极耳11和集流构件50，并根据测得的数据计算第一固定结构61的抗拉强度。第二固定结构62的抗拉强度可由相同的方式测得。
在电池单体7出现热失控时，端盖30在气压的作用下对集流构件50和第一极耳11施加拉力；由于第二集流部52与第一连接部31的连接强度小于第一集流部51与第一极耳11的连接强度，所以集流构件50会先与第一连接部31分离；集流构件50与第一连接部31分离后，集流构件50不会受到端盖30的拉力，这样可以保持集流构件50与第一极耳11的固定连接，降低集流构件50阻塞用于泄放内部压力的通道的风险。
在一些实施例中，第一连接部31包括第一凸部311和环绕在第一凸部311外侧的第一板体312，第一凸部311从第一板体312的内表面沿面向电极组件10的方向凸出，第一连接部31上与第一凸部311相对应的位置形成有从第一板体312的外表面沿面向电极组件10的方向凹陷的第一凹部313。薄弱部32位于第一板体312的外侧，并沿着第一板体312的外边缘设置。第二集流部52与第一凸部311相抵并焊接，以形成第二固定结构62。
第一板体312可为环形的平板结构，其具有沿厚度方向Z相对设置的内表面和 外表面，第一板体312的内表面面向电极组件10。第一凸部311沿面向电极组件10的方向凸出于薄弱部32。
第一凹部313能够降低第一凸部311的强度，提高第一凸部311的弹性，这样，在电池单体7震动时，第一凸部311能够通过变形释放应力，以减小传递到薄弱部32的应力，减缓薄弱部32的疲劳老化。第一凹部313还能够减小第一凸部311的厚度，降低焊接第一凸部311和第二集流部52所需的能量，减少传递到薄弱部32的热量，减缓薄弱部32的疲劳老化。
在一些实施例中，第一集流部51在端盖30的厚度方向Z上覆盖薄弱部32。
薄弱部32沿厚度方向Z的投影位于第一集流部51沿厚度方向Z的投影之内。
在本实施例中，集流构件50可以将薄弱部32与第一极耳11隔开，以减少掉落到薄弱部32上的电极组件10中的活性颗粒，降低薄弱部32被腐蚀的风险。
在一些实施例中，第一凸部311支撑集流构件50，以在第一集流部51和端盖30之间形成用于避让薄弱部32的避让空隙G。
避让空隙G为形成于第一集流部51和端盖30之间的未被其它固体构件填充的空间。避让空隙G与薄弱部32沿厚度方向Z相对，从而起到避让薄弱部32的作用。
第一连接部31通过集流构件50支撑第一极耳11，以减小电极组件10在电池单体7震动时的晃动幅度，提高电极组件10的稳定性。避让空隙G可以将薄弱部32与第一集流部51隔开，以避免第一集流部51在薄弱部32破裂时堵塞用于泄放内部压力的通道，提高安全性。
在一些实施例中，电极组件10为卷绕式结构，电极组件10在卷绕中心处具有第一通孔14。第二集流部52设置有第二通孔521，第二通孔521被配置为与第一通孔14相对设置，以将电极组件10内的气体引导至第一连接部31。
在厚度方向Z上，第一通孔14与第二通孔521至少部分地重叠，以使第一通孔14与第二通孔521连通。
当电极组件10热失控时，高温高压气体能够经由第一通孔14和第二通孔521作用在第一连接部31上，从而快速的断开第一连接部31和集流构件50之间的连接。
在一些实施例中，端盖30还包括第二连接部33，第二连接部33环绕在第一连接部31的外侧并用于与壳体20固定连接。薄弱部32位于第一连接部31和第二连接部33之间并用于连接第一连接部31和第二连接部33。
第二连接部33可通过焊接、卡接、粘接或其它方式连接于壳体20，以将端盖30固定在壳体20上。第二连接部33可以电连接于壳体20，也可以绝缘地连接于壳体20。
第二连接部33的强度大于薄弱部32的强度；示例性地，第二连接部33的厚度大于薄弱部32的厚度。
在本实施例中，端盖30通过环绕在薄弱部32外侧的第二连接部33固定于壳体20，以增大薄弱部32与壳体20的间距，减少传递到薄弱部32的应力，减缓薄弱部32的疲劳老化。
在一些实施例中，薄弱部32用于在电池单体7的内部压力达到阈值时破裂并断 开第一连接部31和第二连接部33之间的连接。
在本实施例中，在第一连接部31和第二连接部33之间的连接断开后，第一连接部31和第二连接部33在内部压力的作用下可以向外翻转，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
示例性地，端盖30将壳体20电连接于第一极耳11，壳体20可作为电池单体7的输出极。当电池单体7的内部压力达到阈值时，薄弱部32破裂并断开第一连接部31和第二连接部33之间的连接，这样可以断开电极组件10与外部电路的连接，停止充放电，减缓电极组件10的产气，提高安全性。
示例性地，固定结构60被配置为在电池单体7的内部压力达到阈值时至少一部分被破坏以断开第一连接部31与第一极耳11之间的连接。同时，随着薄弱部32的破裂，第一连接部31在气压的作用下脱离第二连接部33，以增大用于泄放内部压力的通道，从而快速泄放内部压力，提高安全性。
在一些实施例中，第二连接部33包括第二板体332和环绕在第二板体332外侧的第二凸部331，第二凸部331从第二板体332的内表面沿面向电极组件10的方向凸出，第二连接部33上与第二凸部331相对应的位置形成有从第二板体332的外表面沿面向电极组件10的方向凹陷的第二凹部333。第二板体332环绕在薄弱部32的外侧，第二凸部331用于与壳体20固定连接。
第二板体332可为环形的平板结构，其具有沿厚度方向Z相对设置的内表面和外表面，第二板体332的内表面面向电极组件10。
第二凸部331沿面向电极组件10的方向凸出于薄弱部32。
可选地，第二板体332和集流构件50在厚度方向Z上至少部分重叠。
第二凹部333能够降低第二凸部331的强度，提高第二凸部331的弹性，这样，在电池单体7震动时，壳体20上的应力传递到第二凸部331，第二凸部331能够通过变形释放应力，以减小传递到薄弱部32的应力，减缓薄弱部32的疲劳老化。
示例性地，薄弱部32位于第一板体312和第二板体332之间并连接第一板体312和第二板体332。
在一些实施例中，第二凸部331的外侧面331a抵接于壳体20的内表面并用于与壳体20焊接，以封闭开口21。
第二凸部331的外侧面331a为第二凸部331的面向壳体20的侧壁22的表面。第二凸部331的外侧面331a为柱面，可选地，第二凸部331的外侧面331a为圆柱面。
第二凸部331伸入壳体20的部分可与壳体20过盈配合、过渡配合或间隙配合。可选地，第二凸部331伸入壳体20的部分可与壳体20过盈配合，过盈配合可以增大壳体20和端盖30之间的连接强度，改善密封性能。
可选地，第二凸部331和壳体20的侧壁22通过激光焊接相连。焊接时，激光照射在第二凸部331和侧壁22的交界处，激光将第二凸部331的外侧面331a的至少部分和壳体20的内表面的部分熔化并连接在一起。第二凸部331的外侧面331a抵接于壳体20的内表面，这样可以降低激光射入壳体20内部烧伤电极组件10的风险。
可替代地，激光也可以照射在侧壁22的背离第二凸部331的外表面。
在本实施例中，焊接可以实现密封，降低电解液泄露的风险，并提高第二凸部331和壳体20之间的连接强度和过流能力。
第二凹部333能够降低第二凸部331的强度，提高第二凸部331的弹性，这样，在焊接第二凸部331和壳体20的过程中，第二凸部331可以通过变形释放焊接应力，从而降低焊接区域变形、开裂的风险，减少传递到薄弱部32的焊接应力，提高安全性。
在一些实施例中，第二凸部331与第一极耳11相抵，以支撑第一极耳11。
在本实施例中，第二凸部331支撑第一极耳11，以减小电极组件10在电池单体7震动时的晃动幅度，提高电极组件10的稳定性。
集流构件50支撑第一极耳11的中部区域，第二凸部331支撑第一极耳11的边缘区域，这样可以提高第一极耳11受力的均匀性，降低电极组件10的极片在厚度方向Z上偏移、错位的风险。
当第一连接部31在气压的作用下脱离电池单体7时，第二凸部331可以通过支撑第一极耳11和集流构件50，以降低集流构件50遮挡用于泄放内部压力的通道的风险，保证排气顺畅，提高安全性。
图7为图4所示的端盖的局部剖视示意图。
如图7所示，在一些实施例中，端盖30设有凹槽34，端盖30与凹槽34相对的区域形成薄弱部32。
薄弱部32的厚度小于第一连接部的厚度，从而使薄弱部32的强度小于第一连接部的强度。
示例性地，可以采用机加工方式在端盖30上去除材料以形成凹槽34，有利于降低加工成本和加工难度。沿端盖30的厚度方向，薄弱部32和凹槽34对应设置。
凹槽34可以设置于端盖30的内表面，薄弱部32为端盖30的位于凹槽34的底面和端盖30的外表面之间的部分。可替代地，凹槽34也可以设置于端盖30的外表面，薄弱部32为端盖30的位于凹槽34的底面和端盖30的内表面之间的部分。
示例性地，端盖30的内表面包括第一板体312的内表面和第二板体332的内表面，端盖30的外表面包括第一板体312的外表面和第二板体332的外表面。第一板体312的内表面和第二板体332的内表面齐平，第一板体312的外表面和第二板体332的外表面齐平。凹槽34位于第一板体312和第二板体332之间。
本实施例通过设置凹槽34来减小薄弱部32的厚度和强度，从而使端盖30能够在在电池单体7的内部压力达到阈值时沿薄弱部32破裂。
在一些实施例中，端盖30包括第一镍层30a、钢层30b和第二镍层30c，第一镍层30a设置于钢层30b面向第一极耳的表面，第二镍层30c设置于钢层30b背离第一极耳的表面。凹槽34从第一镍层30a的背离钢层30b的表面沿面向第二镍层30c的方向凹陷，且凹槽34的深度大于第一镍层30a的厚度，且小于第一镍层30a和钢层30b的厚度之和。
第一镍层30a的背离钢层30b的表面即为端盖30的内表面，第二镍层30c的背离钢层30b的表面即为端盖30的外表面。
端盖30由金属复合板制成。第一镍层30a和第二镍层30c可以起到保护钢层 30b的作用，降低钢层30b被水、氧等物质腐蚀的风险，提高密封性。
第一镍层30a的厚度和第二镍层30c的等厚度均小于钢层30b的厚度。
第一镍层30a和第二镍层30c主要起到抗腐蚀的作用，其可以具有较小的厚度；而钢层30b是端盖30的基体结构，其可具有较大的厚度。
在本实施例中，凹槽34位于端盖30的内侧，在成型过程中不会破坏外部的第二镍层30c，所以第二镍层30c能够从外侧保护钢层30b，以降低钢层30b被腐蚀的风险；钢层30b本身不易被电解液腐蚀，因此，即使凹槽34将钢层30b露出，也不易引发安全风险。
图8为本申请另一些实施例提供的电池单体的剖视示意图；图9为图8所示的电池单体在方框B处的放大示意图。
如图8和图9所示，在一些实施例中，固定结构60为第一极耳11与第一连接部31焊接所形成的焊接部。
在本实施例中，第一连接部31与第一极耳11通过焊接直接连接，这样可以简化电池单体7的结构，例如，可以省去集流构件。
图10为本申请一些实施例提供的电池单体的制造方法的流程示意图。
如图10所示，本申请实施例的电池单体的制造方法包括：
S100、提供壳体，壳体具有开口；
S200、提供电极组件，并将电极组件安装到壳体内，电极组件在面向开口的一端设有第一极耳；
S300、提供端盖，并将端盖连接于壳体，以使端盖盖合于开口，端盖包括第一连接部和薄弱部，薄弱部沿第一连接部的边缘设置；
S400、将第一连接部固定连接于第一极耳并形成固定结构，以限制第一连接部的移动；
其中，端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力。
需要说明的是，通过上述电池单体的制造方法制造出的电池单体的相关结构，可参见上述各实施例提供的电池单体。
图11为本申请一些实施例提供的电池单体的制造系统的示意性框图。
如图11所示，本申请实施例的电池单体的制造系统90包括：
第一提供装置91，用于提供壳体，壳体具有开口；
第二提供装置92，用于提供电极组件，并将电极组件安装到壳体内，电极组件在面向开口的一端设有第一极耳；
第三提供装置93，用于提供端盖，并将端盖连接于壳体，以使端盖盖合于开口，端盖包括第一连接部和薄弱部，薄弱部沿第一连接部的边缘设置；
组装装置94，用于将第一连接部固定连接于第一极耳并形成固定结构，以限制第一连接部的移动；
其中，端盖被配置为在电池单体的内部压力达到阈值时沿薄弱部破裂，以泄放内部压力。
通过上述制造系统制造出的电池单体的相关结构，可参见上述各实施例提供的电池单体。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换，但这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (29)

  1. 一种电池单体，包括：
    壳体，具有开口；
    电极组件，容纳于所述壳体内，所述电极组件在面向所述开口的一端设有第一极耳；
    端盖，用于盖合所述开口，所述端盖包括第一连接部和薄弱部，所述薄弱部沿所述第一连接部的边缘设置，所述端盖被配置为在所述电池单体的内部压力达到阈值时沿所述薄弱部破裂，以泄放所述内部压力；
    其中，所述电池单体还包括固定结构，所述固定结构用于将所述第一连接部固定连接于所述第一极耳，以限制所述第一连接部的移动。
  2. 根据权利要求1所述的电池单体，其中，所述第一连接部通过所述固定结构与所述第一极耳电连接。
  3. 根据权利要求1或2所述的电池单体，其中，所述固定结构被配置为在所述电池单体的内部压力达到所述阈值时至少一部分被破坏以断开所述第一连接部与所述第一极耳之间的连接。
  4. 根据权利要求1-3任一项所述的电池单体，其中，所述固定结构为所述第一极耳与所述第一连接部焊接所形成的焊接部。
  5. 根据权利要求1-3任一项所述的电池单体，还包括集流构件，设于所述端盖与所述第一极耳之间，所述集流构件用于连接所述第一连接部和所述第一极耳，以实现所述端盖和所述第一极耳的电连接；
    所述固定结构包括第一固定结构和第二固定结构，所述第一固定结构为所述集流构件的一部分与所述第一极耳焊接所形成的焊接部，所述第二固定结构为所述集流构件的另一部分与所述第一连接部焊接所形成的焊接部。
  6. 根据权利要求5所述的电池单体，其中，
    所述集流构件包括第一集流部和第二集流部，所述第一集流部环绕在所述第二集流部的外侧，所述第一固定结构为所述第一集流部与所述第一极耳焊接所形成的焊接部，所述第二固定结构为所述第二集流部与所述第一连接部焊接所形成的焊接部。
  7. 根据权利要求6所述的电池单体，其中，所述第二固定结构被配置为在所述电池单体的内部压力达到所述阈值时被破坏以断开所述第二集流部与所述第一连接部之间的连接。
  8. 根据权利要求6或7所述的电池单体，其中，所述第二集流部与所述第一连接部的连接强度小于所述第一集流部与所述第一极耳的连接强度。
  9. 根据权利要求6-8任一项所述的电池单体，其中，
    所述第一连接部包括第一凸部和环绕在所述第一凸部外侧的第一板体，所述第一凸部从所述第一板体的内表面沿面向所述电极组件的方向凸出，所述第一连接部上与所述第一凸部相对应的位置形成有从所述第一板体的外表面沿面向所述电极组件的方 向凹陷的第一凹部；
    所述薄弱部位于所述第一板体的外侧，并沿着所述第一板体的外边缘设置；
    所述第二集流部与所述第一凸部相抵并焊接，以形成所述第二固定结构。
  10. 根据权利要求9所述的电池单体，其中，所述第一集流部在所述端盖的厚度方向上覆盖所述薄弱部。
  11. 根据权利要求9或10所述的电池单体，其中，所述第一凸部支撑所述集流构件，以在所述第一集流部和所述端盖之间形成用于避让所述薄弱部的避让空隙。
  12. 根据权利要求6-11任一项所述的电池单体，其中，所述电极组件为卷绕式结构，所述电极组件在卷绕中心处具有第一通孔；
    所述第二集流部设置有第二通孔，所述第二通孔被配置为与所述第一通孔相对设置，以将所述电极组件内的气体引导至所述第一连接部。
  13. 根据权利要求1-12任一项所述的电池单体，其中，所述端盖还包括第二连接部，所述第二连接部环绕在所述第一连接部的外侧并用于与所述壳体固定连接；
    所述薄弱部位于所述第一连接部和所述第二连接部之间并用于连接所述第一连接部和所述第二连接部。
  14. 根据权利要求13所述的电池单体，其中，所述薄弱部用于在所述电池单体的内部压力达到所述阈值时破裂并断开所述第一连接部和所述第二连接部之间的连接。
  15. 根据权利要求13或14所述的电池单体，其中，所述第二连接部包括第二板体和环绕在所述第二板体外侧的第二凸部，所述第二凸部从所述第二板体的内表面沿面向所述电极组件的方向凸出，所述第二连接部上与所述第二凸部相对应的位置形成有从所述第二板体的外表面沿面向所述电极组件的方向凹陷的第二凹部；
    所述第二板体环绕在所述薄弱部的外侧，所述第二凸部用于与所述壳体固定连接。
  16. 根据权利要求15所述的电池单体，其中，所述第二凸部的外侧面抵接于所述壳体的内表面并用于与所述壳体焊接，以封闭所述开口。
  17. 根据权利要求15或16所述的电池单体，其中，所述第二凸部与所述第一极耳相抵，以支撑所述第一极耳。
  18. 根据权利要求1-17任一项所述的电池单体，其中，所述薄弱部环绕所述第一连接部一圈。
  19. 根据权利要求1-18任一项所述的电池单体，其中，所述端盖设有凹槽，所述端盖与所述凹槽相对的区域形成所述薄弱部。
  20. 根据权利要求19所述的电池单体，其中，所述端盖包括第一镍层、钢层和第二镍层，所述第一镍层设置于所述钢层面向所述第一极耳的表面，所述第二镍层设置于所述钢层背离所述第一极耳的表面；
    所述凹槽从所述第一镍层的背离所述钢层的表面沿面向所述第二镍层的方向凹陷，且所述凹槽的深度大于所述第一镍层的厚度，且小于所述第一镍层和所述钢层的厚度之和。
  21. 根据权利要求1-20任一项所述的电池单体，其中，所述端盖用于将所述第一极耳电连接于所述壳体。
  22. 根据权利要求21所述的电池单体，其中，所述壳体还包括侧壁和连接于所述侧壁的底壁，所述侧壁沿所述端盖的厚度方向延伸并环绕所述电极组件的外周设置，所述底壁设有电极引出孔；
    所述电极组件还包括与所述第一极耳极性相反的第二极耳，所述第二极耳设于所述电极组件背离所述开口的一端；
    所述电池单体还包括安装于所述电极引出孔的电极端子，所述电极端子电连接于所述第二极耳。
  23. 根据权利要求22所述的电池单体，其中，所述底壁和所述侧壁为一体形成结构。
  24. 根据权利要求21-23任一项所述的电池单体，其中，所述第一极耳为负极极耳，所述壳体的基体材质为钢。
  25. 根据权利要求1-24任一项所述的电池单体，其中，所述电池单体为圆柱电池单体。
  26. 一种电池，包括多个根据权利要求1-25中任一项所述的电池单体。
  27. 一种用电装置，包括根据权利要求26所述的电池，所述电池用于提供电能。
  28. 一种电池单体的制造方法，包括：
    提供壳体，所述壳体具有开口；
    提供电极组件，并将所述电极组件安装到所述壳体内，所述电极组件在面向所述开口的一端设有第一极耳；
    提供端盖，并将所述端盖连接于所述壳体，以使所述端盖盖合于所述开口，所述端盖包括第一连接部和薄弱部，所述薄弱部沿所述第一连接部的边缘设置；
    将所述第一连接部固定连接于所述第一极耳并形成固定结构，以限制所述第一连接部的移动；
    其中，所述端盖被配置为在所述电池单体的内部压力达到阈值时沿所述薄弱部破裂，以泄放所述内部压力。
  29. 一种电池单体的制造系统，包括：
    第一提供装置，用于提供壳体，所述壳体具有开口；
    第二提供装置，用于提供电极组件，并将所述电极组件安装到所述壳体内，所述电极组件在面向所述开口的一端设有第一极耳；
    第三提供装置，用于提供端盖，并将所述端盖连接于所述壳体，以使所述端盖盖合于所述开口，所述端盖包括第一连接部和薄弱部，所述薄弱部沿所述第一连接部的边缘设置；
    组装装置，用于将所述第一连接部固定连接于所述第一极耳并形成固定结构，以限制所述第一连接部的移动；
    其中，所述端盖被配置为在所述电池单体的内部压力达到阈值时沿所述薄弱部破裂，以泄放所述内部压力。
PCT/CN2021/122104 2021-09-30 2021-09-30 电池单体及其制造方法和制造系统、电池以及用电装置 Ceased WO2023050281A1 (zh)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN202180081089.7A CN116529941B (zh) 2021-09-30 2021-09-30 电池单体及其制造方法和制造系统、电池以及用电装置
KR1020237004892A KR102897974B1 (ko) 2021-09-30 2021-09-30 전지 셀 및 그의 제조 방법, 제조 시스템, 전지 및 전기 장치
EP21958858.9A EP4354624A4 (en) 2021-09-30 2021-09-30 BATTERY CELL AND ASSOCIATED MANUFACTURING SYSTEM AND METHOD, BATTERY AND ELECTRICAL DEVICE
JP2023509718A JP7739414B2 (ja) 2021-09-30 2021-09-30 電池セル、その製造方法及び製造システム、電池並びに電力消費装置
PCT/CN2021/122104 WO2023050281A1 (zh) 2021-09-30 2021-09-30 电池单体及其制造方法和制造系统、电池以及用电装置
US18/112,501 US12614822B2 (en) 2021-09-30 2023-02-22 Battery cell, method and system for manufacturing same, battery, and electrical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/122104 WO2023050281A1 (zh) 2021-09-30 2021-09-30 电池单体及其制造方法和制造系统、电池以及用电装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/112,501 Continuation US12614822B2 (en) 2021-09-30 2023-02-22 Battery cell, method and system for manufacturing same, battery, and electrical device

Publications (1)

Publication Number Publication Date
WO2023050281A1 true WO2023050281A1 (zh) 2023-04-06

Family

ID=85780341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/122104 Ceased WO2023050281A1 (zh) 2021-09-30 2021-09-30 电池单体及其制造方法和制造系统、电池以及用电装置

Country Status (6)

Country Link
US (1) US12614822B2 (zh)
EP (1) EP4354624A4 (zh)
JP (1) JP7739414B2 (zh)
KR (1) KR102897974B1 (zh)
CN (1) CN116529941B (zh)
WO (1) WO2023050281A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117096511A (zh) * 2023-10-18 2023-11-21 蜂巢能源科技股份有限公司 电芯、电池模组及电池包

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3234294A1 (en) * 2021-10-14 2023-04-20 Min-Woo Kim Cylindrical secondary battery to which laser welding is applied and fabricating method thereof, battery pack and vehicle including the same
KR20240152014A (ko) 2023-04-12 2024-10-21 에이치엘만도 주식회사 디스크 브레이크 캘리퍼 및 디스크 브레이크 장치
EP4465421A1 (en) 2023-05-08 2024-11-20 LG Energy Solution, Ltd. Battery cell and method of manufacturing a battery cell
KR20250043952A (ko) * 2023-09-22 2025-03-31 주식회사 엘지에너지솔루션 이차 전지
CN221226400U (zh) * 2023-09-28 2024-06-25 常州瑞德丰精密技术有限公司 电池盖板结构、电池以及用电设备
EP4641817A1 (en) * 2023-11-02 2025-10-29 LG Energy Solution, Ltd. Welding structure of battery can, current collecting plate and cap, and battery cell using same
FR3156073B1 (fr) * 2023-12-01 2025-10-17 Stellantis Auto Sas Ensemble de montage d’un bouchon de ventilation sur un capot de caisson de batterie de vehicule automobile
CN120752800A (zh) * 2023-12-14 2025-10-03 株式会社Lg新能源 具有用于防止罐的侧壁破裂的结构的电池电芯
KR102833974B1 (ko) * 2023-12-14 2025-07-14 주식회사 엘지에너지솔루션 캔의 측벽부재 파손 방지 구조를 구비하는 배터리 셀
CN223321363U (zh) * 2024-08-21 2025-09-09 株式会社Aesc日本 二次电池、电池组及电子装置
KR20260052566A (ko) * 2024-10-11 2026-04-20 삼성에스디아이 주식회사 이차 전지 및 이를 포함하는 전지 팩

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09129208A (ja) * 1995-10-31 1997-05-16 Matsushita Electric Ind Co Ltd 電池用防爆封口板
CN101373823A (zh) * 2007-08-23 2009-02-25 上海华伍波尔电池科技有限公司 一种多功能用盖帽结构的电池负极极柱
CN201994356U (zh) * 2011-04-29 2011-09-28 惠州亿纬锂能股份有限公司 一种电池组合盖帽
CN204361193U (zh) * 2014-12-16 2015-05-27 天津神鹿能源有限公司 一种锂离子动力电池
CN112768845A (zh) * 2021-04-09 2021-05-07 江苏时代新能源科技有限公司 电池单体及其制造方法和制造系统、电池以及用电装置
CN113258124A (zh) * 2021-07-06 2021-08-13 江苏时代新能源科技有限公司 电池单体、电池、用电设备及电池单体的制造方法和设备

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3222962B2 (ja) * 1992-12-25 2001-10-29 三洋電機株式会社 防爆型の密閉電池
JPH10214609A (ja) * 1997-01-30 1998-08-11 Mitsubishi Cable Ind Ltd 密閉型電池の安全構造
JPH1186819A (ja) * 1997-09-02 1999-03-30 Mitsubishi Cable Ind Ltd 密閉型電池の安全構造
JP4284712B2 (ja) * 1998-03-10 2009-06-24 パナソニック株式会社 密閉型電池用防爆封口板およびそれを用いた密閉型電池
JPH11329402A (ja) * 1998-05-19 1999-11-30 Alps Electric Co Ltd 電池の電路遮断部品
JP2004071265A (ja) * 2002-08-05 2004-03-04 Sanyo Electric Co Ltd 電池
KR100881403B1 (ko) * 2007-03-08 2009-03-09 (주)하나나노텍 2차전지의 안전변 어셈블리
DE102008002665A1 (de) * 2008-06-26 2009-12-31 Robert Bosch Gmbh Batteriepack und Handwerkzeugmaschine mit einem Batteriepack
KR101279994B1 (ko) 2010-10-15 2013-07-05 주식회사 엘지화학 전극리드에 안전부재가 위치한 구조의 캡 어셈블리 및 이를 포함하고 있는 원통형 전지
JP6569735B2 (ja) * 2015-09-09 2019-09-04 株式会社村田製作所 電池、電池缶、電池パック、電子機器、電動車両、蓄電装置および電力システム
JP6747654B2 (ja) 2017-05-22 2020-08-26 エルジー・ケム・リミテッド 防錆性ガスケットを含む円筒形電池
JP2019009057A (ja) * 2017-06-28 2019-01-17 日立オートモティブシステムズ株式会社 二次電池
US20210184308A1 (en) * 2017-12-13 2021-06-17 Samsung Sdi Co., Ltd. Cylindrical lithium ion secondary battery
CN207800665U (zh) * 2018-02-01 2018-08-31 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
EP4092815A4 (en) * 2020-01-17 2024-05-15 SANYO Electric Co., Ltd. SEALED BATTERY
CN112713345B (zh) * 2021-03-26 2021-07-16 江苏时代新能源科技有限公司 电池单体、电池、用电装置、制造方法及制造设备
CN216085200U (zh) * 2021-09-30 2022-03-18 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09129208A (ja) * 1995-10-31 1997-05-16 Matsushita Electric Ind Co Ltd 電池用防爆封口板
CN101373823A (zh) * 2007-08-23 2009-02-25 上海华伍波尔电池科技有限公司 一种多功能用盖帽结构的电池负极极柱
CN201994356U (zh) * 2011-04-29 2011-09-28 惠州亿纬锂能股份有限公司 一种电池组合盖帽
CN204361193U (zh) * 2014-12-16 2015-05-27 天津神鹿能源有限公司 一种锂离子动力电池
CN112768845A (zh) * 2021-04-09 2021-05-07 江苏时代新能源科技有限公司 电池单体及其制造方法和制造系统、电池以及用电装置
CN113258124A (zh) * 2021-07-06 2021-08-13 江苏时代新能源科技有限公司 电池单体、电池、用电设备及电池单体的制造方法和设备

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4354624A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117096511A (zh) * 2023-10-18 2023-11-21 蜂巢能源科技股份有限公司 电芯、电池模组及电池包
CN117096511B (zh) * 2023-10-18 2024-01-12 蜂巢能源科技股份有限公司 电芯、电池模组及电池包

Also Published As

Publication number Publication date
JP7739414B2 (ja) 2025-09-16
KR20230048045A (ko) 2023-04-10
EP4354624A4 (en) 2025-07-09
KR102897974B1 (ko) 2025-12-09
CN116529941B (zh) 2025-08-26
US12614822B2 (en) 2026-04-28
CN116529941A (zh) 2023-08-01
JP2023547008A (ja) 2023-11-09
EP4354624A1 (en) 2024-04-17
US20230207992A1 (en) 2023-06-29

Similar Documents

Publication Publication Date Title
CN216085200U (zh) 电池单体、电池以及用电装置
CN218769959U (zh) 电池单体、电池以及用电装置
CN216213727U (zh) 电池单体、电池以及用电装置
CN216213942U (zh) 电池单体、电池以及用电装置
CN216085238U (zh) 电池单体、电池以及用电装置
CN116529941A (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
US20240313340A1 (en) Battery cell, battery, and power consuming device
US20230344068A1 (en) End cap, battery cell, battery, and power consuming device
WO2023137976A1 (zh) 电池单体、电池以及用电装置
WO2023279260A1 (zh) 电池单体、电池、用电设备及电池单体的制造方法和设备
WO2023050282A1 (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
WO2023051731A1 (zh) 电池单体、电池以及用电装置
CN116529942B (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
CN116018718B (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
US20240313338A1 (en) Battery cell, method and system for manufacture same, battery, and power consuming device
CN116636076B (zh) 电池单体及其制造方法和制造系统、电池以及用电装置
WO2023000202A1 (zh) 电池单体及其制造方法和制造系统、电池以及用电装置

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 20237004892

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2023509718

Country of ref document: JP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21958858

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202180081089.7

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2021958858

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2021958858

Country of ref document: EP

Effective date: 20240109

NENP Non-entry into the national phase

Ref country code: DE

WWG Wipo information: grant in national office

Ref document number: 202180081089.7

Country of ref document: CN