WO2024103201A1 - 端盖组件、电池单体、电池和用电装置 - Google Patents

端盖组件、电池单体、电池和用电装置 Download PDF

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Publication number
WO2024103201A1
WO2024103201A1 PCT/CN2022/131619 CN2022131619W WO2024103201A1 WO 2024103201 A1 WO2024103201 A1 WO 2024103201A1 CN 2022131619 W CN2022131619 W CN 2022131619W WO 2024103201 A1 WO2024103201 A1 WO 2024103201A1
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WO
WIPO (PCT)
Prior art keywords
battery cell
end cap
connecting sub
sub
groove
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/CN2022/131619
Other languages
English (en)
French (fr)
Inventor
杨开焕
谢勇锋
周文林
柯海波
李全坤
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 EP22965394.4A priority Critical patent/EP4589754A4/en
Priority to CN202280096985.5A priority patent/CN119343830A/zh
Priority to PCT/CN2022/131619 priority patent/WO2024103201A1/zh
Publication of WO2024103201A1 publication Critical patent/WO2024103201A1/zh
Priority to US19/036,994 priority patent/US20250174779A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside 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
    • 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
    • H01M50/543—Terminals
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • 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
    • H01M2200/10—Temperature sensitive devices
    • H01M2200/103—Fuse
    • 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
    • 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

Definitions

  • the present application relates to the technical field of batteries, and more particularly, to an end cap assembly, a battery cell, a battery and an electric device.
  • Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.
  • Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.
  • the present application provides an end cover assembly, a battery cell, a battery and an electrical device, which can improve the energy density of the battery cell.
  • an embodiment of the present application provides an end cap assembly for a battery cell, the end cap assembly comprising an end cap and an electrode terminal, the end cap having an electrode lead-out hole; the electrode terminal comprising a connecting portion and a terminal body, the terminal body protruding from the connecting portion and at least partially accommodated in the electrode lead-out hole; the connecting portion is provided with a groove.
  • the terminal body is accommodated in the electrode lead-out hole of the end cover, and the electric energy is led out through the terminal body; by providing a groove in the connecting portion, the tab or other components of the electrode terminal of the battery cell can be accommodated in the groove, which not only reduces the weight of the battery cell, but also saves the internal space of the battery cell, thereby improving the energy density of the battery cell.
  • the connecting portion includes a first connecting sub-portion and a second connecting sub-portion, the second connecting sub-portion is connected between the terminal body and the first connecting sub-portion, and the thickness of the second connecting sub-portion is less than the thickness of the first connecting sub-portion to form a groove.
  • the terminal body is connected to the thicker first connecting sub-portion, which can increase the connection strength between the terminal body and the connecting portion and improve the stability of the terminal body.
  • a surface of the electrode assembly of the connecting portion facing the battery cell is provided with a groove, so as to facilitate accommodating the electrode tab or other components of the electrode assembly in the groove, facilitate process preparation, and improve production efficiency.
  • the surface of the first connecting sub-part facing the end cap is flush with the surface of the second connecting sub-part facing the end cap, which can improve the bearing capacity of the connecting part on the end cap and enhance the strength of the end cap assembly.
  • the thickness of the second connecting sub-part in the thickness direction of the end cover, is H1, and the thickness of the first connecting sub-part is H2, then 1/5H2 ⁇ H1 ⁇ 4/5H2, which can reduce the weight and internal capacity of the battery cell and ensure the strength of the second connecting sub-part.
  • first connecting sub-portion and the second connecting sub-portion are arranged along the first direction; in the second direction, at least one end of the second connecting sub-portion extends beyond the first connecting sub-portion, and the first direction, the second direction and the thickness direction of the end cap are perpendicular to each other.
  • At least one end of the second connecting sub-part exceeds the first connecting sub-part, which can further reduce the weight of the connecting part, further save the internal space of the battery cell, and improve the energy density of the battery cell.
  • the electrode terminal is provided with a weight reducing groove, which is located on one side of the first connecting sub-part along the second direction and is surrounded by the first connecting sub-part and the two second connecting sub-parts.
  • the two second connecting sub-parts are respectively located on both sides of the first connecting sub-part along the first direction, so that one end cap assembly can be connected to two electrode assemblies at the same time, thereby improving the energy density of the battery cell.
  • the weight reduction groove is surrounded by the first connecting sub-part and the two second connecting sub-parts, which can not only reduce the weight of the end cap assembly, save the internal space of the battery cell, further improve the energy density of the battery cell, but also provide more connection space for the components connected to the second connecting sub-part.
  • the end cap assembly further includes a seal arranged around the terminal body, at least part of the seal is clamped between the end cap and the connecting portion, and in the thickness direction of the end cap, the projection of the weight reduction groove does not overlap with the projection of the seal.
  • the seal can enhance the sealing effect between the end cap and the electrode terminal, reduce the probability of battery cell leakage, and improve the safety performance of the battery cell.
  • the projection of the weight reduction groove does not overlap with the projection of the seal, which can increase the compression of the seal and further improve the safety performance of the battery cell.
  • the connecting portion includes a tab connecting section and a fuse section, the fuse section is located between the tab connecting section and the terminal body, and the tab connecting section is used to connect the tab of the electrode assembly.
  • the battery cell can be fused in time under external short working conditions, and is not prone to fire and explosion, thereby improving the safety performance of the battery cell.
  • the end cap assembly further includes a seal arranged around the terminal body, at least a portion of the seal is clamped between the end cap and the connecting portion, and in the thickness direction of the end cap, the projection of the seal does not overlap with the projection of the groove.
  • the seal can enhance the sealing effect between the end cap and the electrode terminal, reduce the probability of battery cell leakage, and improve the safety performance of the battery cell.
  • the projection of the seal does not overlap with the projection of the groove, which can increase the compression of the seal and further improve the safety performance of the battery cell.
  • an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and an end cap assembly of any of the above-mentioned embodiments, wherein the shell has an opening; the electrode assembly is accommodated in the shell; the end cap is used to cover the opening, and the connecting portion is located inside the battery cell.
  • the electrode assembly has a tab, which is connected to the connecting portion, and at least a portion of the tab is accommodated in the groove, which not only reduces the weight of the battery cell, but also saves the space occupied by the tab, thereby improving the energy density of the battery cell.
  • the tab includes a horizontal section directly connected to the connecting portion, and along the thickness direction of the end cover, the thickness of the horizontal section is less than or equal to the depth of the groove, which can further save the space occupied by the tab.
  • an embodiment of the present application provides a battery, comprising a battery cell according to any of the above embodiments.
  • an embodiment of the present application provides an electrical device, comprising a battery cell according to any of the above embodiments, wherein the battery cell is used to provide electrical energy.
  • FIG1 is a schematic diagram of a vehicle according to some embodiments of the present application.
  • FIG2 is a schematic diagram of the structure of a battery in some embodiments of the present application.
  • FIG3 is a schematic structural diagram of the battery module shown in FIG2 ;
  • FIG4 is a schematic diagram of the exploded structure of a battery cell in some embodiments of the present application.
  • FIG5 is a cross-sectional schematic diagram of a battery cell according to some embodiments of the present application.
  • FIG6 is a schematic diagram of the structure of a flip cover assembly in some embodiments of the present application.
  • FIG7 is a schematic structural diagram of a connecting portion in some embodiments of the present application.
  • FIG8 is a schematic structural diagram of the connecting portion shown in FIG6 from another angle
  • FIG9 is an enlarged schematic diagram of portion A shown in FIG8 ;
  • FIG10 is a schematic structural diagram of a connection portion of other embodiments of the present application.
  • FIG11 is a schematic structural diagram of the connecting portion shown in FIG10 from another angle
  • FIG12 is a schematic structural diagram of a connecting portion of some other embodiments of the present application.
  • FIG13 is a schematic structural diagram of a connection portion of some further embodiments of the present application.
  • FIG14 is a schematic structural diagram of the connecting portion shown in FIG13 from another angle
  • FIG15 is a top view of a battery cell according to some embodiments of the present application.
  • FIG. 16 is a partial schematic diagram of a battery cell according to some embodiments of the present application.
  • Vehicle 1000 battery 100; controller 200; motor 300; housing 10; upper cover 10a; lower cover 10b; battery module 400; battery cell 20; shell 22; end cover 21; electrode terminal 26; electrode assembly 23; main body 231; pole ear 232; vertical section 232a; horizontal section 232b; end cover assembly 500; electrode lead-out hole 21a; connecting part 30; groove 30a; first connecting sub-part 31; second connecting sub-part 32; pole ear connecting section 321; fuse section 322; through hole 32a; weight reduction groove 30b; terminal body 40; seal 41; thickness direction X; first direction Y; second direction Z.
  • the terms “installed”, “connected”, “connected”, and “attached” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
  • the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this.
  • the battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.
  • battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this.
  • Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.
  • 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 the present application may include a battery module or a battery pack.
  • the battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte.
  • the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator.
  • the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer.
  • the current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer.
  • the current collector not coated with the negative electrode active material layer is stacked as a negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon.
  • the material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc.
  • the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.
  • the electrode assembly is generally electrically connected to the end cap assembly through the tab, and the end cap assembly leads the electrical energy of the electrode assembly.
  • the connection structure between the end cap assembly and the electrode assembly of the battery cell needs to occupy the internal space of the battery cell, reducing the internal capacity of the battery cell and reducing the energy density of the battery cell.
  • an end cap assembly is used for a battery cell
  • the end cap assembly includes an end cap and an electrode terminal, the end cap has an electrode lead-out hole;
  • the electrode terminal includes a connecting portion and a terminal body, the terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole;
  • the connecting portion is provided with a groove.
  • the terminal body is accommodated in the electrode lead-out hole of the end cap, and the electric energy is led out through the terminal body; by providing a groove in the connecting portion, the pole ear or other components of the electrode terminal of the battery cell can be accommodated in the groove, which not only reduces the weight of the battery cell, but also saves the internal space of the battery cell, and improves the energy density of the battery cell.
  • the battery cells disclosed in the embodiments of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft.
  • a power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is beneficial to improving the stability of battery performance and battery life.
  • the embodiment of the present application provides an electric device using a battery as a power source
  • the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.
  • the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc.
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • a battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000.
  • the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000.
  • the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.
  • the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 2 is an exploded view of a battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a box body 10 and a battery cell 20.
  • the box body 10 may include an upper cover 10a and a lower cover 10b, the upper cover 10a and the lower cover 10b cover each other, and the upper cover 10a and the lower cover 10b jointly define a storage space for accommodating the battery cell 20.
  • the lower cover 10b may be a hollow structure with one end open, the upper cover 10a may be a plate-like structure, the upper cover 10a covers the open side of the lower cover 10b, so that the upper cover 10a and the lower cover 10b jointly define a storage space; the upper cover 10a and the lower cover 10b may also be hollow structures with one side open, and the open side of the upper cover 10a covers the open side of the lower cover 10b.
  • the box body 10 formed by the upper cover 10a and the lower cover 10b may be in various shapes, such as a cylinder, a cuboid, etc.
  • FIG3 is a schematic diagram of the structure of the battery module 400 shown in FIG2 .
  • the battery 100 there may be multiple battery cells 20 , and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.
  • a mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
  • the multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module 400 in the form of multiple battery cells 20 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 400 may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10.
  • the battery 100 may also include other structures.
  • the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20 .
  • Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.
  • the battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.
  • FIG. 4 is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application.
  • a battery cell 20 refers to the smallest unit that constitutes a battery.
  • the battery cell 20 includes a shell 21, an electrode assembly 22, and other functional components.
  • the end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22.
  • the end cap 21 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 21 is not easily deformed when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved.
  • Functional components such as electrode terminals 26 can be provided on the end cap 21.
  • the electrode terminal 26 can be used to electrically connect to the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20.
  • the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold.
  • the material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the present embodiment.
  • an insulating member can also be provided on the inner side of the end cap 21, and the insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit.
  • the insulating member can be plastic, rubber, etc.
  • the shell 21 is a component used to form the internal environment of the battery cell 20, wherein the formed accommodating cavity 21a can be used to accommodate the electrode assembly 22, electrolyte and other components.
  • the shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 22.
  • the material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.
  • the electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs.
  • One or more electrode assemblies 22 may be included in the housing 21.
  • An insulating film 24 may be provided on the outer surface of the electrode assembly 22 to insulate and protect the battery cells 20.
  • the electrode assembly 22 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet.
  • the parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 232.
  • the positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body.
  • Figure 5 is a cross-sectional schematic diagram of a battery cell of some embodiments of the present application
  • Figure 6 is a structural schematic diagram of a flip cover assembly of some embodiments of the present application
  • the embodiments of the present application provide an end cover assembly 500, which is used for a battery cell 20, and the end cover assembly 500 includes an end cover 21 and an electrode terminal 26, and the end cover 21 has an electrode lead-out hole 21a;
  • the electrode terminal 26 includes a connecting portion 30 and a terminal body 40, the terminal body 40 protrudes from the connecting portion 30 and is at least partially accommodated in the electrode lead-out hole 21a;
  • the connecting portion 30 is provided with a groove 30a.
  • the groove 30a may be arranged on the side of the connection part 30 facing the electrode assembly 23 of the battery cell 20, or on the side of the connection part 30 facing away from the electrode assembly 23, or on the side of the connection part 30, or on both the side of the connection part 30 facing the electrode assembly 23 and the side away from the electrode assembly 23; the shape of the groove 30a may be U-shaped, L-shaped, or annular or other shapes.
  • the pole ear 232 of the electrode assembly 23 may be accommodated in the groove 30a to achieve electrical connection between the pole ear 232 and the connection part 30, or the adapter sheet may be arranged in the groove 30a, or the adapter sheet and the pole ear 232 may be accommodated in the groove 30a, and the pole ear 232 may be electrically connected to the connection part 30 through the adapter sheet.
  • the terminal body 40 is accommodated in the electrode lead-out hole 21a of the end cover 21, and the electric energy is led out to the outside of the battery cell 20 through the terminal body 40; by providing a groove 30a in the connecting portion 30, the pole ear 232 or other components of the battery cell 20 can be accommodated in the groove 30a, which not only reduces the weight of the battery cell 20, but also saves the internal space of the battery cell 20, thereby improving the energy density of the battery cell 20.
  • Figure 7 is a structural schematic diagram of the connecting portion of some embodiments of the present application
  • Figure 8 is a structural schematic diagram of the connecting portion shown in Figure 6 at another angle
  • Figure 9 is an enlarged schematic diagram of portion A shown in Figure 8
  • the connecting portion 30 includes a first connecting sub-portion 31 and a second connecting sub-portion 32, the second connecting sub-portion 32 is connected between the terminal body 40 and the first connecting sub-portion 31, and the thickness H1 of the second connecting sub-portion 32 is less than the thickness H2 of the first connecting sub-portion 31 to form a groove 30a.
  • the second connecting sub-portion 32 can be arranged on one side or both sides of the first connecting sub-portion 31, and the groove 30a is L-shaped; the second connecting sub-portion 32 can also be arranged around the first connecting sub-portion 31, and the groove 30a is annular.
  • the second connecting sub-portion 32 is connected between the terminal body 40 and the first connecting sub-portion 31" means that along the thickness direction X of the end cover 21, the projection of the first connecting sub-portion 31 on the terminal body 40 at least partially overlaps
  • the thickness H1 of the second connecting sub-portion 32 refers to the size of the second connecting sub-portion 32 along the thickness direction X of the end cover 21
  • the thickness H2 of the first connecting sub-portion 31 refers to the size of the first connecting sub-portion 31 along the thickness direction X of the end cover 21.
  • the thickness H1 of the second connecting sub-portion 32 is less than the thickness H2 of the first connecting sub-portion 31, which is equivalent to thinning the area of the second connecting sub-portion 32 of the connecting portion 30 to form the groove 30a.
  • the terminal body 40 is connected to the thicker first connecting sub-portion 31, which can increase the connection strength between the terminal body 40 and the connecting portion 30 and improve the stability of the terminal body 40.
  • a groove 30a is provided on the surface of the connection portion 30 facing the electrode assembly 23 of the battery cell 20.
  • the groove 30a can be provided on the side of the connection portion 30, or in the middle or other areas of the connection portion 30. Since the pole ear 232 is located on the side of the electrode assembly 23 facing the end cap assembly 500, the pole ear 232 can be bent and directly accommodated in the groove 30a and connected to the second connection sub-portion 32, or after the adapter is accommodated in the groove 30a, the pole ear 232 is connected to the electrode terminal 26 through the adapter.
  • connection portion 30 facing the electrode assembly 23 of the battery cell 20 is provided with a groove 30a, and there is no need to bypass the connection portion 30 and connect the pole ear 232 to the side of the connection portion 30 away from the electrode assembly 23, which facilitates the pole ear 232 or other components of the electrode assembly 23 to be accommodated in the groove 30a, facilitates process preparation, and improves production efficiency.
  • the surface of the first connection sub-portion 31 facing the end cap 21 is flush with the surface of the second connection sub-portion 32 facing the end cap 21. That is, the groove 30a is not arranged on the side of the connection portion 30 away from the electrode assembly 23, but on the side of the connection portion 30 facing the electrode assembly 23.
  • the surface of the connection portion 30 facing the end cover 21 is a flat surface, which can improve the bearing capacity of the connection portion 30 on the end cover 21 and enhance the strength of the end cover assembly 500 .
  • the second connecting sub-portion 32 is recessed toward the end cover 21 to form a groove 30 a.
  • the thickness of the second connecting sub-portion 32 is H1
  • the thickness of the first connecting sub-portion 31 is H2, then 1/5H2 ⁇ H1 ⁇ 4/5H2. If the thickness of the second connecting sub-portion 32 is too small, the structural strength of the second connecting sub-portion 32 will be affected; if the thickness of the second connecting sub-portion 32 is too large, the accommodation space of the tab 232 or the adapter will be reduced, the internal space of the battery cell 20 will not change much, and the energy density will be limited.
  • the thickness of the second connecting sub-portion 32 is moderate, which can reduce the weight and internal capacity of the battery cell 20 while ensuring the strength of the second connecting sub-portion 32 .
  • Figure 10 is a structural schematic diagram of the connecting portion of other embodiments of the present application
  • Figure 11 is a structural schematic diagram of the connecting portion shown in Figure 10 at another angle
  • the first connecting sub-portion 31 and the second connecting sub-portion 32 are arranged along the first direction Y
  • in the second direction Z at least one end of the second connecting sub-portion 32 exceeds the first connecting sub-portion 31, and the first direction Y, the second direction Z and the thickness direction X of the end cover 21 are perpendicular to each other.
  • Any end of the second connecting sub-portion 32 along the second direction Z may exceed the first connecting sub-portion 31 , or both opposite ends of the second connecting sub-portion 32 along the second direction Z may exceed the first connecting sub-portion 31 , so that a gap is formed between the first connecting sub-portion 31 and the second connecting sub-portion 32 .
  • At least one end of the second connecting sub-portion 32 extends beyond the first connecting sub-portion 31 , which can further reduce the weight of the connecting portion 30 , further save the internal space of the battery cell 20 , and improve the energy density of the battery cell 20 .
  • the two second connecting sub-portions 32 are respectively located on both sides of the first connecting sub-portion 31 along the first direction Y, so that one end cap assembly 500 can be connected to two electrode assemblies 23 at the same time, thereby improving the energy density of the battery cell 20.
  • the weight reduction groove 30b is surrounded by the first connecting sub-portion 31 and the two second connecting sub-portions 32, which can not only reduce the weight of the end cap assembly 500, save the internal space of the battery cell 20, further improve the energy density of the battery cell 20, but also provide more connection space for the components connected to the second connecting sub-portion 32.
  • the weight-reducing groove 30 b may not be formed at the end of the connecting portion 30 , but may be disposed in the middle or other areas of the connecting portion 30 .
  • Figure 12 is a structural schematic diagram of the connecting portion of some other embodiments of the present application.
  • the end cover assembly 500 also includes a seal 41 arranged around the terminal body 40, and at least a portion of the seal 41 is clamped between the end cover 21 and the connecting portion 30.
  • the projection of the weight reduction groove 30b does not overlap with the projection of the seal 41.
  • the seal 41 can be made of compressible materials such as rubber and foam.
  • the seal 41 is arranged between the end cover 21 and the connecting portion 30 in a compressed state.
  • the seal 41 can enhance the sealing effect between the end cover 21 and the electrode terminal 26, reduce the probability of leakage of the battery cell 20, and improve the safety performance of the battery cell 20.
  • the projection of the weight-reducing groove 30b does not overlap with the projection of the seal 41, that is, the seal 41 is not arranged in the portion of the connecting portion 30 corresponding to the weight-reducing groove 30b, which can increase the compression of the seal 41 and further improve the safety performance of the battery cell 20.
  • Figure 13 is a structural schematic diagram of the connecting portion of some other embodiments of the present application
  • Figure 14 is a structural schematic diagram of the connecting portion shown in Figure 13 from another angle; please refer to Figures 13 and 14 in combination.
  • the connecting portion 30 includes a pole tab connecting section 321 and a fuse section 322, and the fuse section 322 is located between the pole tab connecting section 321 and the terminal body 40.
  • the pole tab connecting section 321 is used to connect the pole tab 232 of the electrode assembly 23.
  • the fuse section 322 is located on the side of the second connecting sub-section 32 close to the first connecting sub-section 31.
  • the part of the second connecting sub-section 32 corresponding to the through hole 32a along the second direction Z is the fuse section 322. Since the length L1 of the fuse section 322 along the second direction Z is less than the length L2 of the tab connecting section 321 along the second direction Z, the flow area of the fuse section 322 is reduced, so that the fuse section 322 is easy to fuse.
  • the through hole 32a can be directly set at the end of the second connecting sub-section 32 along the second direction Z to facilitate process preparation, and the through hole 32a can be set at both ends of the second connecting sub-section 32 along the second direction Z.
  • the through hole 32a can also be set in the middle or other areas of the second connecting sub-section 32 close to the first connecting sub-section 31, and the number of the through holes 32a can be one or more.
  • the tab 232 can be directly welded to the tab connecting section 321 , or can be connected to the tab connecting section 321 via an adapter.
  • the battery cell 20 can be fused in time under external short circuit conditions, and is not prone to fire and explosion, thereby improving the safety performance of the battery cell 20 .
  • the end cap assembly 500 also includes a seal 41 arranged around the terminal body 40, at least part of the seal 41 is clamped between the end cap 21 and the connecting portion 30, and in the thickness direction X of the end cap 21, the projection of the seal 41 does not overlap with the projection of the groove 30a.
  • the groove 30 a is disposed on a side of the second connecting sub-portion 32 facing away from the end cover, and the projection of the sealing member 41 does not overlap with the projection of the second connecting sub-portion 32 .
  • the seal 41 can be made of compressible materials such as rubber and foam.
  • the seal 41 is arranged between the end cap 21 and the connecting portion 30 in a compressed state, which can enhance the sealing effect between the end cap 21 and the electrode terminal 26, reduce the probability of leakage of the battery cell 20, and improve the safety performance of the battery cell 20.
  • the projection of the sealing member 41 falls within the projection range of the first connecting sub-portion 31 , and the sealing member 41 is clamped between the end cover 21 and the first connecting sub-portion 31 .
  • an embodiment of the present application provides a battery cell 20, including a shell 22, an electrode assembly 23 and an end cover assembly 500 of any of the above-mentioned embodiments, wherein the shell 22 has an opening; the electrode assembly 23 is accommodated in the shell 22; the end cover 21 is used to cover the opening, and the connecting portion 30 is located inside the battery cell 20.
  • FIG. 15 is a top view of a battery cell of some embodiments of the present application; in some embodiments, the electrode assembly 23 has a tab 232, the tab 232 is connected to the connecting portion 30, and at least part of the tab 232 is accommodated in the groove 30a.
  • the tab 232 can be partially accommodated in the groove 30a, or can be fully accommodated in the groove 30a, which not only reduces the weight of the battery cell 20, but also saves the space occupied by the tab 232, thereby improving the energy density of the battery cell 20.
  • FIG16 is a partial schematic diagram of a battery cell in some embodiments of the present application.
  • the tab 232 includes a horizontal section 232b directly connected to the connecting portion 30. In the thickness direction X along the end cover 21, the thickness of the horizontal section 232b is less than or equal to the depth of the groove 30a.
  • the electrode assembly 23 includes a main body 231 and a pole ear 232. After the pole ear 232 is bent, the pole ear 232 includes a vertical section 232a and a horizontal section 232b. The vertical section 232a extends from the main body 231 toward the end cover 21, and the horizontal section 232b is bent from the vertical section 232a along the first direction Y and in a direction close to the first connecting sub-section 31, so as to connect the horizontal section 232b to the second connecting sub-section 32.
  • the tab 232 is bent to form a horizontal section 232b, which can save space occupied by the tab 232 compared to connecting the unbent tab 232 to the connecting portion 30. Moreover, the horizontal section 232b is directly connected to the connecting portion 30, which can omit the adapter, further saving space and reducing costs.
  • an embodiment of the present application provides a battery 100, comprising a battery cell 20 according to any of the above-mentioned embodiments.
  • an embodiment of the present application provides an electrical device, comprising a battery cell 20 according to any of the above embodiments, wherein the battery cell 20 is used to provide electrical energy.
  • the present application provides an end cap assembly 500 for a battery cell 20, the end cap assembly 500 includes an end cap 21 and an electrode terminal 26, the end cap 21 has an electrode lead-out hole 21a; the electrode terminal 26 includes a connecting portion 30 and a terminal body 40, the terminal body 40 protrudes from the connecting portion 30 and is at least partially accommodated in the electrode lead-out hole 21a; the connecting portion 30 is provided with a groove 30a on the surface of the electrode assembly 23 of the battery cell 20, the pole ear 232 is accommodated in the groove 30a and is directly connected to the second connecting sub-portion 32.
  • the connecting portion 30 includes a first connecting sub-portion 31 and a second connecting sub-portion 32, the second connecting sub-portion 32 is connected between the terminal body 40 and the first connecting sub-portion 31, and the thickness H1 of the second connecting sub-portion 32 is less than the thickness H2 of the first connecting sub-portion 31 to form the groove 30a.

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  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种端盖组件（500）、电池单体（20）、电池（100）和用电装置。端盖组件（500），用于电池单体（20）。端盖组件（500）包括端盖（21）和电极端子（26），端盖（21）具有电极引出孔（21a），电极端子（26）包括连接部（30）和端子主体（40），端子主体（40）凸出于连接部（30）并至少部分容纳于电极引出孔（21a）；连接部（30）设有凹槽（30a），减轻了电池单体（20）的重量，而且节省了电池单体（20）的内部空间，提高了电池单体（20）的能量密度。

Description

端盖组件、电池单体、电池和用电装置 技术领域
本申请涉及电池技术领域，并且更具体地，涉及一种端盖组件、电池单体、电池和用电装置。
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，如何提高电池单体的能量密度，是电池技术中的一个研究方向。
发明内容
本申请提供了一种端盖组件、电池单体、电池和用电装置，其能提高电池单体的能量密度。
第一方面，本申请实施例提供了一种端盖组件，用于电池单体，端盖组件包括端盖和电极端子，端盖具有电极引出孔；电极端子包括连接部和端子主体，端子主体凸出于连接部并至少部分容纳于电极引出孔；连接部设有凹槽。
上述方案中，将端子主体容纳于端盖的电极引出孔，通过端子主体将电能引出；通过在连接部设置凹槽，可将电池单体的电极端子的极耳或其它部件容纳于凹槽中，不仅减轻了电池单体的重量，而且节省了的电池单体的内部空间，提高了电池单体的能量密度。
在一些实施例中，连接部包括第一连接子部和第二连接子部，第二连接子部连接于端子主体和第一连接子部之间，第二连接子部的厚度小于 第一连接子部的厚度以形成凹槽。
上述方案中，端子主体与较厚的第一连接子部连接，可以增加端子主体与连接部之间的连接强度，提高端子主体的稳固性。
在一些实施例中，连接部朝向电池单体的电极组件的表面设有凹槽，便于将电极组件的极耳或其它部件容纳于凹槽中，便于工艺制备，提高了生产效率。
在一些实施例中，第一连接子部面向端盖的表面和第二连接子部面向端盖的表面齐平，可提高连接部对端盖的承载力，加强端盖组件的强度。
在一些实施例中，在端盖的厚度方向上，第二连接子部的厚度为H1，第一连接子部的厚度为H2，则1/5H2≤H1≤4/5H2，既能减少电池单体的重量和内部容量，又能保证第二连接子部的强度。
在一些实施例中，第一连接子部和第二连接子部沿第一方向布置；在第二方向上，第二连接子部的至少一端超出第一连接子部，第一方向、第二方向和端盖的厚度方向两两垂直。
上述方案中，第二连接子部的至少一端超出第一连接子部，能够进一步减轻连接部的重量，进一步节省电池单体内部空间，提高电池单体的能量密度。
在一些实施例中，第二连接子部为两个，两个第二连接子部分别位于第一连接子部沿第一方向的两侧；电极端子设有减重槽，减重槽位于第一连接子部沿第二方向的一侧并由第一连接子部和两个第二连接子部围成。
上述方案中，两个第二连接子部分别位于第一连接子部沿第一方向的两侧，可实现一个端盖组件同时连接两个电极组件，提高电池单体的能量密度。减重槽由第一连接子部和两个第二连接子部围成，既能减轻端盖组件的重量，节省电池单体内部空间，进一步提高电池单体的能量密度，还能为与第二连接子部连接的部件提高更多的连接空间。
在一些实施例中，端盖组件还包括环绕端子主体设置的密封件，至少部分密封件被夹持于端盖与连接部之间，在端盖的厚度方向上，减重槽的投影与密封件的投影不交叠。
上述方案中，密封件能够增强端盖与电极端子之间的密封效果，降 低电池单体漏液的概率，提高电池单体的安全性能。在端盖的厚度方向上，减重槽的投影与密封件的投影不交叠，可提高密封件的压缩量，进一步提高电池单体的安全性能。
在一些实施例中，连接部包括极耳连接段和熔断段，熔断段位于极耳连接段和端子主体之间，极耳连接段用于连接电极组件的极耳。
上述方案中，通过设置熔断段，使得电池单体在外短工况下，能够及时熔断，不易起火爆炸，提高电池单体的安全性能。
在一些实施例中，端盖组件还包括环绕端子主体设置的密封件，至少部分密封件被夹持于端盖与连接部之间，在端盖的厚度方向上，密封件的投影与凹槽的投影不重叠。
上述方案中，密封件能够增强端盖与电极端子之间的密封效果，降低电池单体漏液的概率，提高电池单体的安全性能。在端盖的厚度方向上，密封件的投影与凹槽的投影不重叠，可提高密封件的压缩量，进一步提高电池单体的安全性能。
第二方面，本申请实施例提供了一种电池单体，包括壳体、电极组件和上述任一实施方式的端盖组件，壳体具有开口；电极组件容纳于壳体内；端盖用于盖合开口，连接部位于电池单体的内部。
在一些实施例中，电极组件具有极耳，极耳连接于连接部，且至少部分极耳容纳于凹槽内，不仅减轻了电池单体的重量，而且节省了极耳的占用空间，提高了电池单体的能量密度。
在一些实施例中，极耳包括与连接部直接连接的水平段，在沿端盖的厚度方向上，水平段的厚度小于或等于凹槽的深度，能够进一步节省极耳的占用空间。
第三方面，本申请实施例提供了一种电池，包括上述任一实施方式的电池单体。
第四方面，本申请实施例提供了一种用电装置，包括上述任一实施方式的电池单体，电池单体用于提供电能。
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的车辆的示意图；
图2为本申请一些实施例的电池的结构示意图；
图3为图2所示的电池模块的结构示意图；
图4为本申请一些实施例电池单体的分解结构示意图；
图5为本申请一些实施例电池单体的剖面示意图；
图6为本申请一些实施例的翻盖组件的结构示意图；
图7为本申请一些实施例的连接部的结构示意图；
图8为图6所示的连接部的另一角度的结构示意图；
图9为图8所示A部放大示意图；
图10为本申请另一些实施例的连接部的结构示意图；
图11为图10所示的连接部的另一角度的结构示意图；
图12为本申请又一些实施例的连接部的结构示意图；
图13为本申请再一些实施例的连接部的结构示意图；
图14为图13所示的连接部的另一角度的结构示意图；
图15为本申请一些实施例电池单体的俯视图；
图16为本申请一些实施例电池单体的部分示意图。
在附图中，附图并未按照实际的比例绘制。
附图标号说明：
车辆1000；电池100；控制器200；马达300；箱体10；上盖10a；下盖10b；电池模块400；电池单体20；壳体22；端盖21；电极端子26；电极组件23；主体部231；极耳232；竖直段232a；水平段232b；端盖组件500；电极引出孔21a；连接部30；凹槽30a；第一连接子部31；第二连接子部32；极耳连接段321；熔断段322；通孔32a；减重槽30b；端子主体40；密封件41；厚度方向X；第一方向Y；第二方向Z。
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。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，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。电池单体一般按封装的方式分成三种：柱形电池单体、方体方形电池单体和软包电池单体，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，电极组件由正极片、负极片和隔离膜组成。电池单体主要依靠金属离子在正极片和负极片之间移动来工作。正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，未涂敷正极活性物质层的集流体凸出于已涂覆正极活性物质层的集流体，未涂敷正极活性物质层的集流体层叠后作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负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，未涂敷负极活性物质层的集流体凸出于已涂覆负极活性物质层的集流体，未涂敷负极活性物质层的集流体层叠后作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。
本发明人注意到，电极组件一般通过极耳与端盖组件电连接，端盖组件将电极组件的电能引出。在进一步研究之后发现，电池单体的端盖组件与电极组件之间的连接结构需占用电池单体的内部空间，减小了电池单体的内部容量，降低了电池单体的能量密度。
鉴于此，本申请提供了一种技术方案，在该技术方案中，端盖组件用于电池单体，端盖组件包括端盖和电极端子，端盖具有电极引出孔；电极端子包括连接部和端子主体，端子主体凸出于连接部并至少部分容纳于电极引出孔；连接部设有凹槽。上述方案中，将端子主体容纳于端盖的电极引出孔，通过端子主体将电能引出；通过在连接部设置凹槽，可将电池单体的电极端子的极耳或其它部件容纳于凹槽中，不仅减轻了电池单体的重量，而且节省了的电池单体的内部空间，提高了电池单体的能量密度。
本申请实施例公开的电池单体可以但不限用于车辆、船舶或飞行器等用电装置中。可以使用具备本申请公开的电池单体、电池等组成该用电装置的电源系统，这样，有利于提升电池性能的稳定性和电池寿命。
本申请实施例提供一种使用电池作为电源的用电装置，用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以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，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电装置为车辆1000为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、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。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000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100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请一些实施例提供的电池100的爆炸图。电池100包括箱体10和电池单体20。在一些实施例中，箱体10可以包括上盖10a和下盖10b，上盖10a与下盖10b相互盖合，上盖10a和下盖10b共同限定出用于容纳电池单体20的容纳空间。下盖10b可以为一端开口的空心结构，上盖10a可以为板状结构，上盖10a盖合于下盖10b的开口侧，以使上盖10a与下盖10b共同限定出容纳空间；上盖10a和下盖10b也可以是均为一侧开口的空心结构，上盖10a的开口侧盖合于下盖10b的开口侧。当然，上盖10a和下盖10b形成的箱体10可以是多种形状，比如，圆柱体、长方体等。
图3为图2所示的电池模块400的结构示意图。在电池100中，电池单体20可以是多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内；当然，电池100也可以是多个电池单体20先串联或并联或混联组成电池模块400形式，多个电池模块400再串联或并联或混联形成一个整体，并容纳于箱体10内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体20之间的电连接。
其中，每个电池单体20可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。电池单体20可呈圆柱体、扁平体、长方体或其它形状等。
请参照图4，图4为本申请一些实施例提供的电池单体20的分解结构示意图。电池单体20是指组成电池的最小单元。电池单体20包括有壳体21、电极组件22以及其他的功能性部件。端盖21是指盖合于壳体22的开口处以将电池单体20的内部环境隔绝于外部环境的部件。不限地，端盖21的形状可以与壳体22的形状相适应以配合壳体22。可选地，端盖21可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖21 在受挤压碰撞时就不易发生形变，使电池单体20能够具备更高的结构强度，安全性能也可以有所提高。端盖21上可以设置有如电极端子26等的功能性部件。电极端子26可以用于与电极组件23电连接，以用于输出或输入电池单体20的电能。在一些实施例中，端盖21上还可以设置有用于在电池单体20的内部压力或温度达到阈值时泄放内部压力的泄压机构。端盖21的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。在一些实施例中，在端盖21的内侧还可以设置有绝缘件，绝缘件可以用于隔离壳体22内的电连接部件与端盖21，以降低短路的风险。示例性的，绝缘件可以是塑料、橡胶等。
壳体21是用于形成电池单体20内部环境的组件，其中，形成的容纳腔21a可以用于容纳电极组件22、电解液以及其他部件。壳体21可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，壳体21的形状可以根据电极组件22的具体形状和尺寸大小来确定。壳体21的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
电极组件22是电池单体20中发生电化学反应的部件。壳体21内可以包含一个或更多个电极组件22。电极组件22的外表面可设置绝缘膜24，以对电池单体20之间进行绝缘保护，以电极组件22主要由正极片和负极片卷绕或层叠放置形成，并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成电极组件22的主体，正极片和负极片不具有活性物质的部分各自构成极耳232。正极极耳和负极极耳可以共同位于主体的一端或是分别位于主体的两端。
请结合参阅图5和图6，图5为本申请一些实施例电池单体的剖面示意图；图6为本申请一些实施例的翻盖组件的结构示意图；第一方面，本申请实施例提供了一种端盖组件500，用于电池单体20，端盖组件500包括端盖21和电极端子26，端盖21具有电极引出孔21a；电极端子26包括连接部30和端子主体40，端子主体40凸出于连接部30并至少部分容纳于电极引出孔21a；连接部30设有凹槽30a。
凹槽30a可以设置在连接部30朝向电池单体20的电极组件23的一 侧，也可以设置在连接部30背离电极组件23的一侧，还可以设置在连接部30的侧面，或者在连接部30朝向电极组件23的一侧以及背离电极组件23的一侧均设置凹槽30a；凹槽30a的形状可以为U形、L形或环形等其他形状。可将电极组件23的极耳232容纳于凹槽30a中，以实现极耳232与连接部30之间的电连接，也可以将转接片设置于凹槽30a中，或者将转接片和极耳232均容纳于凹槽30a中，极耳232通过转接片与连接部30电连接。
上述方案中，将端子主体40容纳于端盖21的电极引出孔21a，通过端子主体40将电能引出至电池单体20的外部；通过在连接部30设置凹槽30a，可将电池单体20的极耳232或其它部件容纳于凹槽30a中，不仅减轻了电池单体20的重量，而且节省了的电池单体20的内部空间，提高了电池单体20的能量密度。
请结合参阅图7～图9，图7为本申请一些实施例的连接部的结构示意图；图8为图6所示的连接部的另一角度的结构示意图；图9为图8所示A部放大示意图；在一些实施例中，连接部30包括第一连接子部31和第二连接子部32，第二连接子部32连接于端子主体40和第一连接子部31之间，第二连接子部32的厚度H1小于第一连接子部31的厚度H2以形成凹槽30a。
第二连接子部32可以设置在第一连接子部31的一侧或者两侧，则凹槽30a为L形；第二连接子部32还可以绕第一连接子部31环绕设置，则凹槽30a为环形。需要说明的是，“第二连接子部32连接于端子主体40和第一连接子部31之间”是指在沿端盖21的厚度方向X上，第一连接子部31的投影于端子主体40的投影至少部分交叠，“第二连接子部32的厚度H1”是指第二连接子部32第二连接子部32沿端盖21的厚度方向X上的尺寸，“第一连接子部31的厚度H2”是指第一连接子部31沿端盖21的厚度方向X上的尺寸。第二连接子部32的厚度H1小于第一连接子部31的厚度H2，相当于将连接部30的第二连接子部32的区域减薄，形成了凹槽30a。
上述方案中，由于第二连接子部32的厚度小于第一连接子部31的 厚度，端子主体40与较厚的第一连接子部31连接，可以增加端子主体40与连接部30之间的连接强度，提高端子主体40的稳固性。
在一些实施例中，连接部30朝向电池单体20的电极组件23的表面设有凹槽30a。凹槽30a可以设置在连接部30的侧边，也可以设置在连接部30的中部或其它区域。由于极耳232位于电极组件23朝向端盖组件500的一侧，因此可以将极耳232弯折后直接容纳于凹槽30a中并与第二连接子部32连接，或者将转接片容纳于该凹槽30a后，极耳232通过转接片与电极端子26连接。连接部30朝向电池单体20的电极组件23的表面设有凹槽30a，无需将极耳232绕过连接部30后与连接部30背离电极组件23的一侧连接，便于将电极组件23的极耳232或其它部件容纳于凹槽30a中，便于工艺制备，提高了生产效率。
在一些实施例中，第一连接子部31面向端盖21的表面和第二连接子部32面向端盖21的表面齐平。也就是说，凹槽30a不设置在连接部30背离电极组件23的一侧，而是设置在连接部30朝向电极组件23的一侧。
上述方案中，连接部30朝向端盖21的表面为平整面，可提高连接部30对端盖21的承载力，加强端盖组件500的强度。
可选的，第二连接子部32向端盖21的方向凹陷形成凹槽30a。
在一些实施例中，在端盖21的厚度方向X上，第二连接子部32的厚度为H1，第一连接子部31的厚度为H2，则1/5H2≤H1≤4/5H2。若第二连接子部32的厚度过小，会影响第二连接子部32的结构强度；若第二连接子部32的厚度过大，则会减小极耳232或转接片的容纳空间，电池单体20的内部空间变化不大，能量密度提升有限。
上述方案中，第二连接子部32的厚度适中，既能减少电池单体20的重量和内部容量，又能保证第二连接子部32的强度。
请结合参阅图10和图11，图10为本申请另一些实施例的连接部的结构示意图；图11为图10所示的连接部的另一角度的结构示意图；在一些实施例中，第一连接子部31和第二连接子部32沿第一方向Y布置；在第二方向Z上，第二连接子部32的至少一端超出第一连接子部31，第一方向Y、第二方向Z和端盖21的厚度方向X两两垂直。
第二连接子部32沿第二方向Z的任意一端可超出第一连接子部31，或者第二连接子部32沿第二方向Z的相对两端均超出第一连接子部31，使得第一连接子部31和第二连接子部32之间形成缺口。
上述方案中，第二连接子部32的至少一端超出第一连接子部31，能够进一步减轻连接部30的重量，进一步节省电池单体20内部空间，提高电池单体20的能量密度。
在一些实施例中，第二连接子部32为两个，两个第二连接子部32分别位于第一连接子部31沿第一方向Y的两侧；电极端子26设有减重槽30b，减重槽30b位于第一连接子部31沿第二方向Z的一侧并由第一连接子部31和两个第二连接子部32围成。
在沿端盖21的厚度方向X上，减重槽30b的投影可与第二连接子部32的投影不交叠，减重槽30b相当于在第一连接子部31沿第二方向Z的端部挖孔形成，当然，减重槽30b的投影也可以与其中一个第二连接子部32的投影部分交叠，或者分别与两个第二连接子部32的投影部分交叠。
上述方案中，两个第二连接子部32分别位于第一连接子部31沿第一方向Y的两侧，可实现一个端盖组件500同时连接两个电极组件23，提高电池单体20的能量密度。减重槽30b由第一连接子部31和两个第二连接子部32围成，既能减轻端盖组件500的重量，节省电池单体20内部空间，进一步提高电池单体20的能量密度，还能为与第二连接子部32连接的部件提高更多的连接空间。
在其它实施例中，减重槽30b还可以不形成在连接部30的端部，而设置在连接部30的中部或其它区域。
图12为本申请又一些实施例的连接部的结构示意图，如图12所示，在一些实施例中，端盖组件500还包括环绕端子主体40设置的密封件41，至少部分密封件41被夹持于端盖21与连接部30之间，在端盖21的厚度方向X上，减重槽30b的投影与密封件41的投影不交叠。
密封件41可以采用橡胶、泡棉等可压缩的材料。密封件41呈压缩状态设置在端盖21与连接部30之间，密封件41能够增强端盖21与电极端子26之间的密封效果，降低电池单体20漏液的概率，提高电池单体20 的安全性能。在端盖21的厚度方向X上，减重槽30b的投影与密封件41的投影不交叠，也就是说，密封件41不设置在连接部30对应减重槽30b的部分，可提高密封件41的压缩量，进一步提高电池单体20的安全性能。
图13为本申请再一些实施例的连接部的结构示意图；图14为图13所示的连接部的另一角度的结构示意图；请结合参阅图13和图14，在一些实施例中，连接部30包括极耳连接段321和熔断段322，熔断段322位于极耳连接段321和端子主体40之间，极耳连接段321用于连接电极组件23的极耳232。
熔断段322位于第二连接子部32靠近第一连接子部31的一侧，可通过在第二连接子部32靠近第一连接子部31的一侧设置通孔32a，第二连接子部32沿第二方向Z与通孔32a对应的部分即为熔断段322，由于熔断段322沿第二方向Z的长度L1小于极耳连接段321沿第二方向Z的长度L2，减小了熔断段322的过流面积，使得熔断段322容易熔断。可以理解的是，上述通孔32a可直接设置在第二连接子部32沿第二方向Z的端部，以便于工艺制备，而且可在第二连接子部32沿第二方向Z的两端均设置该通孔32a。当然，上述通孔32a也可以设置在第二连接子部32靠近第一连接子部31的中部或其它区域，通孔32a的数量可以为一个或多个。
极耳232可直接焊接于极耳连接段321，也可以通过转接片与极耳连接段321连接。
上述方案中，通过设置熔断段322，使得电池单体20在外短工况下，能够及时熔断，不易起火爆炸，提高电池单体20的安全性能。
在一些实施例中，端盖组件500还包括环绕端子主体40设置的密封件41，至少部分密封件41被夹持于端盖21与连接部30之间，在端盖21的厚度方向X上，密封件41的投影与凹槽30a的投影不重叠。
作为示例，凹槽30a设置于第二连接子部32背离端盖的一侧，密封件41的投影与第二连接子部32的投影不重叠。
密封件41可以采用橡胶、泡棉等可压缩的材料。密封件41呈压缩状态设置在端盖21与连接部30之间，能够增强端盖21与电极端子26之间的密封效果，降低电池单体20漏液的概率，提高电池单体20的安全性 能。
在端盖21的厚度方向X上，密封件41的投影与凹槽30a的投影不重叠，也就是说，密封件41不设置在连接部30对应凹槽30a的部分，密封件41被连接部30较厚的部分压紧，可提高密封件41的压缩量，进一步降低电池单体20漏液的概率，提高电池单体20的安全性能。
可选的，在沿端盖21的厚度方向X上，密封件41的投影落入第一连接子部31的投影范围内，密封件41被夹紧在端盖21与第一连接子部31之间。
第二方面，本申请实施例提供了一种电池单体20，包括壳体22、电极组件23和上述任一实施方式的端盖组件500，壳体22具有开口；电极组件23容纳于壳体22内；端盖21用于盖合开口，连接部30位于电池单体20的内部。
如图15所示，图15为本申请一些实施例电池单体的俯视图；在一些实施例中，电极组件23具有极耳232，极耳232连接于连接部30，且至少部分极耳232容纳于凹槽30a内。极耳232可以部分容纳于凹槽30a内，也可以全部容纳于凹槽30a内，不仅减轻了电池单体20的重量，而且节省了极耳232的占用空间，提高了电池单体20的能量密度。
如图16所示，图16为本申请一些实施例电池单体的部分示意图。在一些实施例中，极耳232包括与连接部30直接连接的水平段232b。在沿端盖21的厚度方向X上，水平段232b的厚度小于或等于凹槽30a的深度。
电极组件23包括主体部231和极耳232，将极耳232弯折后，极耳232包括竖直段232a和水平段232b，竖直段232a自主体部231向端盖21的方向延伸，水平段232b自竖直段232a沿第一方向Y、且向靠近第一连接子部31的方向弯折，将水平段232b连接于第二连接子部32。
上述方案中，将极耳232弯折形成水平段232b，相比于不弯折的极耳232连接连接部30，可节省极耳232的占用空间。而且将水平段232b直接连接于连接部30，可省去转接片，进一步节省空间，降低成本。
第三方面，本申请实施例提供了一种电池100，包括上述任一实 施方式的电池单体20。
第四方面，本申请实施例提供了一种用电装置，包括上述任一实施方式的电池单体20，电池单体20用于提供电能。
根据本申请的一些实施例，本申请提供了一种端盖组件500，用于电池单体20，端盖组件500包括端盖21和电极端子26，端盖21具有电极引出孔21a；电极端子26包括连接部30和端子主体40，端子主体40凸出于连接部30并至少部分容纳于电极引出孔21a；连接部30朝向电池单体20的电极组件23的表面设有凹槽30a，极耳232容纳于凹槽30a中并与第二连接子部32直接连接。连接部30包括第一连接子部31和第二连接子部32，第二连接子部32连接于端子主体40和第一连接子部31之间，第二连接子部32的厚度H1小于第一连接子部31的厚度H2以形成凹槽30a。
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 (15)

  1. 一种端盖组件，用于电池单体，其特征在于，包括：
    端盖，具有电极引出孔；
    电极端子，包括连接部和端子主体，所述端子主体凸出于所述连接部并至少部分容纳于所述电极引出孔；
    所述连接部设有凹槽。
  2. 根据权利要求1所述的端盖组件，其特征在于，所述连接部包括第一连接子部和第二连接子部，所述第二连接子部连接于所述端子主体和所述第一连接子部之间，所述第二连接子部的厚度小于所述第一连接子部的厚度以形成所述凹槽。
  3. 根据权利要求2所述的端盖组件，其特征在于，所述连接部朝向所述电池单体的电极组件的表面设有所述凹槽。
  4. 根据权利要求3所述的端盖组件，其特征在于，所述第一连接子部面向所述端盖的表面和所述第二连接子部面向所述端盖的表面齐平。
  5. 根据权利要求2-4任一项所述的端盖组件，其特征在于，在所述端盖的厚度方向上，所述第二连接子部的厚度为H1，所述第一连接子部的厚度为H2，则1/5 H2≤H1≤4/5 H2。
  6. 根据权利要求2-4任一项所述的端盖组件，其特征在于，所述第一连接子部和所述第二连接子部沿第一方向布置；在第二方向上，所述第二连接子部的至少一端超出所述第一连接子部，所述第一方向、所述第二方向和所述端盖的厚度方向两两垂直。
  7. 根据权利要求6所述的端盖组件，其特征在于，所述第二连接子部为两个，两个所述第二连接子部分别位于所述第一连接子部沿所述第一方向的两侧；所述电极端子设有减重槽，所述减重槽位于所述第一连接子部沿所述第二方向的一侧并由所述第一连接子部和两个所述第二连接子部围成。
  8. 根据权利要求7所述的端盖组件，其特征在于，所述端盖组件还包括环绕所述端子主体设置的密封件，至少部分所述密封件被夹持于所述端 盖与所述连接部之间，在所述端盖的厚度方向上，所述减重槽的投影与所述密封件的投影不交叠。
  9. 根据权利要求1-8任一项所述的端盖组件，其特征在于，所述连接部包括极耳连接段和熔断段，所述熔断段位于所述极耳连接段和所述端子主体之间，所述极耳连接段用于连接所述电极组件的极耳。
  10. 根据权利要求1-9任一项所述的端盖组件，其特征在于，所述端盖组件还包括环绕所述端子主体设置的密封件，至少部分所述密封件被夹持于所述端盖与所述连接部之间，在所述端盖的厚度方向上，所述密封件的投影与所述凹槽的投影不重叠。
  11. 一种电池单体，其特征在于，包括：
    壳体，具有开口；
    电极组件，容纳于所述壳体内；以及
    如权利要求1～10中任一项所述的端盖组件，所述端盖用于盖合所述开口，所述连接部位于所述电池单体的内部。
  12. 根据权利要求11所述的电池单体，其特征在于，所述电极组件具有极耳，所述极耳连接于所述连接部，且至少部分所述极耳容纳于所述凹槽内。
  13. 根据权利要求12所述的电池单体，其特征在于，所述极耳包括与所述连接部直接连接的水平段，在沿所述端盖的厚度方向上，所述水平段的厚度小于或等于所述凹槽的深度。
  14. 一种电池，其特征在于，包括如权利要求11～13中任一项所述的电池单体。
  15. 一种用电装置，其特征在于，包括如权利要求11～13中任一项所述的电池单体，所述电池单体用于提供电能。
PCT/CN2022/131619 2022-11-14 2022-11-14 端盖组件、电池单体、电池和用电装置 Ceased WO2024103201A1 (zh)

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