WO2024159455A1 - 电池单体、电池及用电装置 - Google Patents

电池单体、电池及用电装置 Download PDF

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Publication number
WO2024159455A1
WO2024159455A1 PCT/CN2023/074140 CN2023074140W WO2024159455A1 WO 2024159455 A1 WO2024159455 A1 WO 2024159455A1 CN 2023074140 W CN2023074140 W CN 2023074140W WO 2024159455 A1 WO2024159455 A1 WO 2024159455A1
Authority
WO
WIPO (PCT)
Prior art keywords
sub
terminal
battery cell
terminal connection
connecting portion
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/CN2023/074140
Other languages
English (en)
French (fr)
Inventor
苏华圣
邢承友
李全坤
徐春光
王鹏
金海族
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 EP23919033.3A priority Critical patent/EP4579924A4/en
Priority to CN202380083589.3A priority patent/CN120322902A/zh
Priority to PCT/CN2023/074140 priority patent/WO2024159455A1/zh
Publication of WO2024159455A1 publication Critical patent/WO2024159455A1/zh
Priority to US19/169,716 priority patent/US20250233285A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01M50/10—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
    • H01M50/147—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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/50—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
    • 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
    • H01M50/538—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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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 field of battery technology, and in particular to a battery cell, a battery and an electrical device.
  • the current collecting component is a component in the battery used to connect the electrode terminal and the electrode lug of the electrode assembly.
  • the terminal connecting portion of the current collecting component is usually designed to be bendable.
  • the terminal connecting portion of the existing current collecting component is mostly a single-layer integrated structure with limited bending capacity.
  • the thickness of the terminal connecting portion cannot be made too thick, resulting in a smaller flow area of the current collecting component, a larger internal resistance, and a larger temperature rise, thereby reducing the safety of the battery.
  • the present application provides a battery cell, a battery and an electrical device, which can alleviate the problem that the current collecting component has a small flow area, a large internal resistance, and a large temperature rise, thereby reducing the safety of the battery.
  • the present application provides a battery cell.
  • the battery cell includes an electrode assembly, a housing, an electrode terminal and a current collecting member.
  • the electrode assembly includes a tab.
  • the housing is used to accommodate the electrode assembly.
  • the electrode terminal is disposed on the housing.
  • the current collecting member includes a tab connection portion and a terminal connection portion, the tab connection portion is used to connect the tab, and the terminal connection portion is used to connect the electrode terminal and the tab connection portion.
  • the terminal connection portion includes a plurality of sub-terminal connection portions stacked in layers, each layer of the sub-terminal connection portion includes a sub-riveting portion, and any two adjacent sub-riveting portions are riveted and fixed.
  • the terminal connection part of the current collecting component is designed as a stacked multi-layer sub-terminal connection part.
  • the bonding force between the multi-layer sub-terminal connection parts is smaller, and the deformation between the layers can be more tolerated when bending, so that the bending ability of the multi-layer sub-terminal connection part is stronger.
  • the overall thickness of the multi-layer sub-terminal connection part i.e., the thickness of the terminal connection part
  • the overall thickness of the multi-layer sub-terminal connection part can be made thicker, the flow area is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery.
  • the bending of the multi-layer sub-terminal connection part to a greater extent can also reduce the height space occupied by the current collecting component, improve the energy density of the battery cell, and thus also improve the energy density of the battery.
  • any two adjacent layers of sub-terminal connection parts are riveted and fixed by two adjacent sub-rivet parts to achieve riveted connection.
  • the positioning accuracy of the terminal connection part is improved, and no welding process is required, thereby improving the production efficiency of the current collecting component.
  • any two adjacent sub-riveted parts are welded to each other. That is, welding reinforcement is performed at the riveted positions of the sub-terminal connection parts of each layer, which improves the connection strength between the sub-terminal connection parts of each layer on the one hand, and increases the current collection The flow area of the component is increased, the internal resistance is reduced, the temperature rise is lowered, and the safety performance of the battery cell is improved.
  • the terminal connecting portion is provided with a fixing structure, in which all the sub-riveting portions are stacked in sequence and cooperate with each other.
  • the sub-rivet parts of the sub-terminal connection parts of adjacent layers are stacked to form a fixed structure, which is accurately positioned and easy to align. At the same time, no welding process is required, which improves the production efficiency of the current collecting component.
  • the riveting of the sub-rivet parts of the sub-terminal connection parts of adjacent layers can reduce burrs.
  • the fixing structure is disposed at an end region of the terminal connection portion close to the electrode terminal. In this way, each layer of the terminal connection portion can be riveted to form a terminal connection portion of an integral structure.
  • the fixing structure is disposed at an end region of the terminal connection portion close to the tab connection portion.
  • the integrated terminal connection portion can be conveniently riveted to the tab connection portion.
  • the fixing structure is disposed at the end region of the terminal connection portion close to the electrode terminal, and at the end region of the terminal connection portion close to the tab connection portion.
  • each layer of the terminal connection portion can be riveted to form a terminal connection portion of an integral structure;
  • the terminal connection portion of the integral structure can be conveniently riveted to the tab connection portion;
  • the opposite ends of the terminal connection portion are both provided with fixing structures, so that the bonding force of the two ends of the terminal connection portion of the integral structure is relatively uniform, and the overall bonding is more firmly.
  • the number of the fixing structures is one or more.
  • the number of the fixing structures is one, the positioning accuracy of the sub-terminal connection parts of any adjacent layers when riveted is ensured.
  • the number of the fixing structures is multiple, the multiple fixing structures can not only ensure the positioning accuracy of the sub-terminal connection parts of any adjacent layers when riveted, but also improve the connection strength between the sub-terminal connection parts, which are not easy to detach from each other, thereby improving the working stability of the current collecting component.
  • the cross-sectional shape of the fixing structure includes any one of a square, a rectangle and a circle.
  • the cross-sectional shape of the fixing structure is not limited and can be any one of a square, a rectangle and a circle, which reduces the design difficulty of the terminal connection part, thereby simplifying the production of the current collecting component.
  • the terminal connection portion has a first main surface and a second main surface that are arranged opposite to each other along its thickness direction after being unfolded, and the fixing structure has a recess formed on one side of the first main surface, and the fixing structure has a first convex portion formed on the second main surface.
  • the fixing structure includes a first convex portion and a concave portion, which can avoid misalignment during stacking when riveting to form the terminal connection portion, and the positioning is accurate and easy to align. At the same time, no welding process is required, which improves the production efficiency of the current collecting component.
  • the fixing structure includes a first convex portion and a concave portion, which can also reduce burrs.
  • the tab connection portion is disposed on a side of the terminal connection portion close to the second main surface.
  • the tab connection portion is provided with a first accommodation portion, and the first protrusion is accommodated in the first accommodation portion.
  • the first protrusion is accommodated in the first accommodation portion, and can play a positioning role when the terminal connection portion is connected to the tab connection portion.
  • the terminal connection portion is fixedly connected to the tab connection portion through the first protrusion.
  • the first protrusion is fixedly connected to the first accommodation portion, so that the terminal connection portion is fixedly connected to the tab connection portion through the first protrusion, which improves the positioning accuracy when the terminal connection portion is connected to the tab connection portion, and does not require a welding process, thereby improving the production efficiency of the current collecting component.
  • each of the sub-rivet portions has a sub-protrusion and a sub-recess, each of the sub-protrusions protrudes in the direction of the second main surface, each of the sub-recesses is recessed from the first main surface toward the second main surface, and the sub-protrusion of one of the two adjacent sub-rivet portions is accommodated and fixedly connected to the sub-recess of the other sub-rivet portion.
  • riveting between the sub-protrusions and sub-recesses of the sub-terminal connection parts of adjacent layers can avoid misalignment during stacking, with accurate positioning and easy alignment. At the same time, no welding process is required, which improves the production efficiency of the current collecting component.
  • riveting between the sub-protrusions and sub-recesses of the sub-terminal connection parts of adjacent layers can reduce burrs.
  • the terminal connection portion is provided with a second receiving portion
  • the tab connection portion is provided with a second convex portion
  • the second convex portion is received in the second receiving portion.
  • the second convex portion is received in the second receiving portion, which can improve the positioning accuracy when the terminal connection portion is connected to the tab connection portion.
  • the tab connection portion is fixedly connected to the terminal connection portion through the second protrusion.
  • the second protrusion is fixedly connected to the second accommodation portion, so that the tab connection portion is fixedly connected to the terminal connection portion through the second protrusion, which improves the positioning accuracy when the tab connection portion is connected to the terminal connection portion, and does not require a welding process, thereby improving the production efficiency of the current collecting component.
  • the terminal connection part and the tab connection part are at least partially welded. That is, welding reinforcement is performed between the terminal connection part and the tab connection part, which, on the one hand, increases the flow area of the current collecting component, reduces the internal resistance, reduces the temperature rise, and improves the safety performance of the battery cell; on the other hand, the connection between the terminal connection part and the tab connection part is made more firm, and the two are not easy to separate, thereby improving the working stability of the current collecting component.
  • the weld mark formed between the terminal connection part and the tab connection part is located in an area outside the fixed structure.
  • the weld mark formed between the terminal connection part and the tab connection part is located in an area outside the fixed structure, which, on the one hand, increases the flow area of the current collecting component, reduces the internal resistance, reduces the temperature rise, and improves the safety performance of the battery cell; on the other hand, without destroying the riveting, makes the connection between the terminal connection part and the tab connection part more firm, and the two are not easy to separate, thereby improving the working stability of the current collecting component.
  • the terminal connection portion is disposed between the tab connection portion and the electrode terminal in a bent manner.
  • the connecting portion is bent and arranged between the pole ear connecting portion and the electrode terminal, which can reduce the height space occupied by the current collecting component in the battery cell. On the one hand, it makes the structure of the battery cell more compact. On the other hand, at the same height of the battery cell, more space can be freed up for the electrode assembly, thereby increasing the energy density of the battery cell.
  • the present application provides a battery, comprising the battery cell described in any of the above embodiments.
  • the battery uses the battery cell of the embodiment of the first aspect, and in the battery cell, the multi-layer sub-terminal connection part of the current collecting component has a stronger bending ability and is not easy to break, thereby ensuring the working stability of the battery; at the same time, under the same bending ability, the overall thickness of the multi-layer sub-terminal connection part can be made thicker, the flow area is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery.
  • the greater degree of bending of the multi-layer sub-terminal connection part can also reduce the height space occupied by the current collecting component, improve the energy density of the battery cell, and thus also improve the energy density of the battery.
  • the present application provides an electrical device, comprising a battery as described in any of the above embodiments, wherein the battery is used to provide electrical energy.
  • the electric device uses the battery in the embodiment of the second aspect, and in the battery cell of the battery, the multi-layer sub-terminal connection part of the current collecting component has a stronger bending ability and is not easy to break, thereby ensuring the working stability of the electric device; at the same time, under the same bending ability, the overall thickness of the multi-layer sub-terminal connection part can be made thicker, the flow area is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery.
  • the greater degree of bending of the multi-layer sub-terminal connection part can also reduce the height space occupied by the current collecting component, improve the energy density of the battery cell, thereby also improving the energy density of the battery, and then improve the battery life of the electric device.
  • FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application.
  • FIG2 is a schematic diagram of an exploded structure of a battery according to some embodiments of the present application.
  • FIG3 is a schematic diagram of a three-dimensional structure of a battery cell according to some embodiments of the present application.
  • FIG4 is a schematic diagram of a three-dimensional structure of a top cover assembly according to some embodiments of the present application.
  • FIG5 is a schematic diagram of the exploded structure of a top cover assembly according to some embodiments of the present application.
  • FIG6 is a schematic diagram of a planar structure of a top cover assembly according to some embodiments of the present application.
  • FIG7 is a schematic cross-sectional view of the top cover assembly shown in FIG6 along line VII-VII;
  • FIG8 is a schematic cross-sectional view of the top cover assembly shown in FIG6 along line VIII-VIII;
  • FIG9 is a schematic diagram of a three-dimensional structure of a current collecting component according to some embodiments of the present application.
  • FIG10 is a schematic diagram of the exploded structure of a current collecting component according to some embodiments of the present application.
  • FIG11 is a schematic diagram of a three-dimensional structure of a terminal connection portion in a current collecting component in some embodiments of the present application.
  • FIG12 is a schematic diagram of a planar structure of a current collecting component according to some embodiments of the present application.
  • FIG13 is a schematic cross-sectional view of the current collecting member shown in FIG12 along line XIII-XIII;
  • FIG14 is a schematic diagram of a planar structure of a current collecting component according to some embodiments of the present application.
  • FIG15 is a schematic cross-sectional view of the current collecting member shown in FIG14 along line XV-XV;
  • FIG. 16 is a schematic diagram of the three-dimensional structure of the current collecting component in some embodiments of the present application.
  • Box body 10 first part 11, second part 12;
  • Battery cell 20 top cover assembly 21, current collecting member 211, pole ear connection part 2111, connection area 21111, welding area 21113, terminal connection part 2113, first connection section 21131, second connection section 21133, bending section 21135, fixing structure 2115, sub-rivet part 21151, first accommodating part 2117, second accommodating part 2118, sub-accommodating part 21181, second protrusion 2119, sub-terminal connection part 21137, top cover sheet 212, first insulating member 213, second insulating member 214, connector 215, electrode terminal 216, sealing member 217; outer shell 23; electrode assembly 25.
  • the term "and/or" is only a description of the association relationship of associated objects, indicating that three relationships may exist.
  • 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 article generally indicates that the associated objects before and after are in an "or" relationship.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.
  • the inventors of the present invention have noticed that the currently common battery is to flatten the pole tabs of the electrode assembly, and after the current collecting component and the pole tabs are welded, the current collecting component is bent and electrically connected to the electrode terminal to realize the current extraction. This places high demands on the current carrying capacity of the current collecting component.
  • the terminal connection part of the current collecting component cannot be made too thick, so the flow area S of the terminal connection part is very small.
  • the terminal connection part of the current collecting component can be designed as a stacked multi-layer sub-terminal connection part.
  • the bonding force between the multi-layer sub-terminal connection parts is smaller, and the layers can tolerate deformation more when bending, thereby making the terminal connection part of the multi-layer structure stronger in bending ability.
  • the overall thickness of the terminal connection part of the multi-layer structure can be made thicker, the flow area of the current collecting component will be larger, the internal resistance will be smaller, and the temperature rise will be reduced. Thereby improving the safety of the battery.
  • the inventor in order to design the terminal connection part of the current collecting component into a stacked multi-layer sub-terminal connection part, the inventor also found that: the terminal connection part of the multi-layer structure obtained by cutting after stacking multiple layers of materials will produce a large number of edge burrs, and the terminal connection part of the multi-layer structure obtained by punching out multiple single-layer sub-terminal connection parts and then stacking multiple single-layer sub-terminal connection parts for welding will not be able to align, and the welding efficiency is low. Both of these production methods cannot achieve mass production.
  • the inventor designed a current collecting component for battery cells.
  • the terminal connection part of the current collecting component is designed as a stacked multi-layer sub-terminal connection part. Any two adjacent layers of sub-terminal connection parts are riveted, without burrs, with high positioning accuracy, easy alignment, and no need for welding process, which improves the production efficiency of the terminal connection part and is easy to mass produce.
  • the battery cell disclosed in the embodiment of the present application can be used in an electrical device that uses a battery as a power source or various energy storage systems that use a battery as an energy storage element.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like.
  • 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, and the like
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.
  • 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 the operating power source of the vehicle 1000, but also serve as the driving power source of 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 10 and a battery cell 20, and the battery cell 20 is contained in the box 10.
  • the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20.
  • the second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12.
  • the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.
  • the battery 100 there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in a mixed connection. It means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by multiple battery cells 20 connected in series, in parallel or in a mixed connection, and then multiple battery modules are 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, for example, the battery 100 may also include a converging component for realizing electrical connection between multiple battery cells 20.
  • Each battery cell 20 may be a secondary battery or a primary battery; it may also be 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.
  • the battery cell 20 refers to the smallest unit constituting the battery 100. In the present application, the battery cell 20 is described by taking a cylindrical battery as an example.
  • FIG3 is a battery cell 20 according to some embodiments of the present application.
  • the battery cell 20 includes a housing 23, an electrode assembly 25, an electrode terminal 216 and a current collecting member 211.
  • the housing 23 is used to accommodate the electrode assembly 25.
  • the electrode assembly 25 includes a pole lug 251.
  • the electrode terminal 216 is disposed on the housing 23.
  • the current collecting member 211 includes a pole lug connecting portion 2111 and a terminal connecting portion 2113.
  • the pole lug connecting portion 2111 is used to connect the pole lug 251.
  • the terminal connecting portion 2113 is used to connect the electrode terminal 216 and the pole lug connecting portion 2111.
  • the terminal connecting portion 2113 includes a plurality of stacked sub-terminal connecting portions 21137, each layer of sub-terminal connecting portions 21137 includes a sub-rivet portion 21151, and any two adjacent sub-rivet portions 21151 are riveted and fixed.
  • the housing 23 may be a cylindrical structure, and a receiving cavity is formed inside the housing 23 for receiving the electrode assembly 25 and the electrolyte. Openings are provided at both ends of the housing 23, so that the electrode assembly 25 can be placed in the receiving cavity of the housing 23 through the openings.
  • the housing 23 may be made of a metal material, such as aluminum or an aluminum alloy, or may be made of an insulating material, such as plastic, rubber, etc.
  • the electrode assembly 25 includes a pole piece unit and a pole ear 251 extending from at least one end surface. Specifically, along the height direction (H) of the battery cell 20, the pole piece unit has two oppositely arranged end surfaces. In the battery cell 20, pole ears 251 are extended from the two end surfaces of the pole piece unit, which are respectively a positive pole ear and a negative pole ear.
  • the pole piece unit includes a negative pole sheet, a positive pole sheet and a separator. The separator is located between adjacent negative pole sheets and positive pole sheets to separate the negative pole sheet from the positive pole sheet.
  • the negative electrode sheet, the separator and the positive electrode sheet are sequentially stacked and wound to form an electrode sheet unit of the electrode assembly 25, that is, the electrode sheet unit is a wound structure.
  • the electrode sheet unit has a gap after being formed, and the electrolyte can enter the electrode sheet unit through the gap to infiltrate the negative electrode sheet and the positive electrode sheet.
  • the negative electrode sheet includes a negative electrode current collector (such as copper foil) and a negative electrode active material layer (such as carbon or silicon) coated on the surface of the negative electrode current collector
  • the positive electrode sheet includes a positive electrode current collector (such as aluminum foil) and a positive electrode active material layer (such as ternary material, lithium iron phosphate or lithium cobalt oxide) coated on the surface of the positive electrode current collector.
  • the negative electrode ear is connected to the negative electrode sheet and extends from the electrode unit, and the negative electrode ear can be directly cut from the negative electrode current collector.
  • the positive electrode ear is connected to the positive electrode sheet and extends from the electrode unit, and the positive electrode ear can be directly cut from the positive electrode current collector.
  • the electrode terminal 216 is a functional component that can be used to conduct the current in the electrode assembly 25 to the outside of the battery 100 to output or input the electric energy of the battery cell 20.
  • the electrode terminal 216 includes a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are respectively located at the two ends of the electrode unit.
  • One end of each electrode terminal 216 extends into the interior of the battery cell 20, and the other end extends into the battery cell 20.
  • An end surface of one end is exposed to the outside of the battery cell 20 and can be connected to an external electrical connector.
  • the current collecting member 211 is a component used to cover the opening of the battery cell 20, connect the tab 251 of the electrode assembly 25 in the opening, and connect the electrode terminal 216 of the battery cell 20.
  • the current collecting member 211 needs to be made of a conductive metal material to ensure that it can serve as a good conductor between the tab 251 and the electrode terminal 216 after being connected with the tab 251 and the electrode terminal 216.
  • the current collecting member 211 used in the embodiment of the present application can be applied to a cylindrical battery cell 20, and can also be used for battery cells 20 of other shapes, such as a rectangular parallelepiped shape.
  • the tab connection part 2111 is the part of the current collecting member 211 that covers the opening of the shell 23 of the battery cell 20.
  • the tab connection part 2111 can be set to a shape that matches the opening shape of the shell 23 of the battery cell 20, for example, a nearly circular shape.
  • the tab connection part 2111 is also used for welding with the tab 251 of the electrode assembly 25.
  • the welding area 21113 of the tab connection part 2111 is the area for welding the tab 251 of the electrode assembly 25, and a suitable area and position can be set according to the need of welding the tab 251.
  • the connection area 21111 of the tab connection part 2111 is an area for connecting the terminal connection part 2113.
  • connection area 21111 of the tab connection part 2111 is set at a position that does not affect the welding of the tab 251 and the tab connection part 2111, that is, the connection area 21111 of the tab connection part 2111 is set in the remaining area after the tab connection part 2111 is removed from the welding area 21113.
  • the connection area 21111 may be a partial area occupied by the tab connection part 2111 after the welding area 21113 is removed, for example, it occupies the left area or the right area of the tab connection part 2111 after the welding area 21113 is removed.
  • the connection area 21111 may also occupy the entire area of the tab connection part 2111 after the welding area 21113 is removed, for example, it occupies the left area and the right area of the tab connection part 2111 after the welding area 21113 is removed.
  • the current collecting member 211 provided in the embodiment of the present application does not limit the shapes of the welding area 21113 and the connecting area 21111 of the tab connecting portion 2111 .
  • the terminal connection part 2113 is a component on the current collecting member 211 for connecting the electrode terminal 216.
  • the terminal connection part 2113 is connected to the connection area 21111 to ensure that the current collecting member 211 is used as a component for conducting current.
  • the material of the terminal connection part 2113 and the material of the pole ear connection part 2111 can be made of the same conductive metal material, or can be made of different conductive metal materials, as long as it is ensured that the current collecting member 211 can be connected to the pole ear 251 and the electrode terminal 216 respectively and can serve as a good conductor between the pole ear 251 and the electrode terminal 216.
  • the length of the terminal connection part 2113 is longer than that of the pole ear connection part 2111.
  • the terminal connection part 2113 includes a first connection section 21131, a second connection section 21133, and a bending section 21135 located between the first connection section 21131 and the second connection section 21133.
  • the first connection section 21131 and the second connection section 21133 are respectively located at opposite ends of the terminal connection portion 2113 after expansion along its own length direction.
  • the first connection section 21131 is used to connect with the electrode terminal 216
  • the second connection section 21133 is used to connect with the pole ear connection portion 2111 and is located in the connection area 21111.
  • the bending section 21135 is a region of the terminal connection portion 2113 used to connect the first connection section 21131 and the second connection section 21133, and has better bending performance.
  • the bending section 21135 can be bent at the position connected with the first connection section 21131, and the bending section 21135 can also be bent at the position connected with the second connection section 21133, so that the bent current collecting member 211 is Z-shaped.
  • the terminal connection part 2113 includes a plurality of sub-terminal connection parts 21137 stacked in layers, wherein each layer of sub-terminal connection parts 21137 is identical and can be conveniently batch-formed by the same process.
  • the multiple layers are fixed together to form an integral terminal connection part 2113.
  • each layer of the sub-terminal connection part 21137 includes a sub-riveting part 21151, and any two adjacent sub-riveting parts 21151 are riveted and fixed.
  • Riveting is a process or method of connecting two parts to be connected by drilling holes in them, inserting rivets and using a rivet gun to rivet them together.
  • the riveting connection between any two adjacent layers of sub-terminal connecting parts 21137 in this application does not use rivets, but directly rivets between any two adjacent layers of sub-terminal connecting parts 21137 to achieve the connection of each layer of sub-terminal connecting parts 21137.
  • the terminal connection part 2113 of the current collecting component 211 is designed as a stacked multi-layer sub-terminal connection part 21137.
  • the bonding force between the multi-layer sub-terminal connection parts 21137 is smaller, and the layers can tolerate deformation more when bending, thereby making the multi-layer sub-terminal connection part 21137 more capable of bending.
  • the overall thickness of the multi-layer sub-terminal connection part 21137 (i.e., the thickness of the terminal connection part 2113) can be made thicker, the flow area is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery 100 (shown in Figure 2).
  • the greater degree of bending of the multi-layer sub-terminal connection part 21137 can also reduce the height space occupied by the current collecting component 211, improve the energy density of the battery cell 20, and thus also improve the energy density of the battery 100.
  • any two adjacent layers of sub-terminal connecting parts 21137 are riveted and fixed by using two adjacent sub-rivet parts 21151 to achieve riveted connection.
  • the positioning accuracy of the terminal connecting part 2113 when connected is improved, and no welding process is required, thereby improving the production efficiency of the current collecting component 211.
  • the battery cell 20 further includes a top cover assembly 21.
  • the electrode assembly 25 is accommodated in the housing 23.
  • the opposite ends of the electrode assembly 25 are respectively provided with a positive electrode tab and a negative electrode tab.
  • the top cover assembly 21 covers the openings at both ends of the housing 23, and the positive electrode tab and the negative electrode tab are both connected to the tab connection portion 2111 (shown in FIG. 9 ) of the current collecting member 211 in the top cover assembly 21.
  • the top cover assembly 21 is a component that covers the opening of the outer shell 23 of the battery cell 20 and provides a closed space for the electrode assembly 25 and electrolyte located inside the outer shell 23. The electric energy of the electrode assembly 25 is led out to the outside through the electrode terminal 216 of the top cover assembly 21.
  • the top cover assembly 21 is provided at both opposite ends of the battery cell 20, and the bending ability of the multi-layer sub-terminal connection part 21137 is stronger. Under the same bending ability, the overall thickness of the multi-layer sub-terminal connection part 21137 can be made thicker, so that the flow area of the current collecting component 211 is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery 100 (shown in Figure 2). In addition, the greater degree of bending of the multi-layer sub-terminal connection part 21137 can also reduce the height space occupied by the current collecting component 211 in the top cover assembly 21 at both ends. Under the same height of the battery cell 20, more space can be freed up at both ends for the positive and negative electrodes, thereby further increasing the energy density of the battery cell 20.
  • the top cover assembly 21 includes a current collecting member 211, a top cover sheet 212, a first insulating member 213, a second insulating member 214, a connecting member 215, and an electrode terminal 216.
  • the top cover sheet 212 includes a first side and a second side opposite to each other.
  • the first insulating member 213 is installed on the first side of the top cover sheet 212.
  • the second insulating member 214 is installed on the second side of the top cover sheet 212.
  • the connecting member 215 is installed on the side of the first insulating member 213 away from the top cover sheet 212.
  • the current collecting member 211 is installed on the side of the second insulating member 214 away from the top cover sheet 212.
  • the electrode terminal 216 passes through the first connecting section 21131 of the current collecting member 211, the second insulating member 214, the top cover sheet 212, the first insulating member 213 and the connecting member 215, and the opposite ends of the electrode terminal 216 are respectively connected to the connecting member 215 and the first connecting section 21131 of the current collecting member 211.
  • the top cover sheet 212 refers to a component that covers the opening of the outer shell 23 to isolate the internal environment of the battery cell 20 from the external environment.
  • the shape of the top cover sheet 212 can be adapted to the shape of the opening of the outer shell 23 to match the outer shell 23.
  • the top cover sheet 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover sheet 212 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved.
  • the first side of the top cover sheet 212 is the side away from the inside of the outer shell 23, and the second side of the top cover sheet 212 is the side facing the inside of the outer shell 23.
  • the connector 215 is a component on the top cover sheet 212 for riveting one end of the electrode terminal 216.
  • the connector 215 can be made of aluminum.
  • the first insulating member 213 and the second insulating member 214 are components arranged on the top cover sheet 212 to play an electrical insulation role.
  • the first insulating member 213 and the second insulating member 214 are both made of insulating materials, such as plastic, rubber, etc.
  • the first insulating member 213 is located on the first side of the top cover sheet 212, and is used to carry the connector 215 and electrically insulate the connector 215 from the top cover sheet 212.
  • the second insulating member 214 is located on the second side of the top cover sheet 212, and is used to accommodate the current collecting component 211 and electrically insulate the current collecting component 211 from the top cover sheet 212.
  • the provision of the first insulating member 213 and the second insulating member 214 can reduce the risk of short circuit.
  • the opposite ends of the electrode terminal 216 are respectively connected to the connector 215 and the first connecting section 21131 of the current collecting member 211, and the second connecting section 21133 of the current collecting member 211 is connected to the tab 251 of the electrode assembly 25 through the tab connecting portion 2111, so as to guide the current of the electrode assembly 25 to the connector 215 on the first side through the tab 251, the current collecting member 211, and the electrode terminal 216 in sequence.
  • the first insulating member 213 and the second insulating member 214 are disposed on opposite sides of the top cover sheet 212, so as to insulate the top cover sheet 212 and reduce the risk of short circuit.
  • the top cover assembly 21 also includes a seal 217, which is sleeved on the electrode terminal 216 and located between the top cover sheet 212 and the electrode terminal 216, for sealing the gap between the top cover sheet 212 and the electrode terminal 216.
  • the seal 217 is a functional component used to seal to prevent the electrolyte in the battery 100 from leaking out.
  • the seal 217 can be made of elastic materials such as rubber and plastic.
  • the shape of the seal 217 can be circular, square, etc., and it only needs to match the shape of the outer peripheral wall of the electrode terminal 216 and be able to pass through the gap between the top cover sheet 212 and the electrode terminal 216.
  • the seal 217 is located between the electrode terminal 216 and the top cover sheet 212 to fill the gap, which can prevent the electrolyte inside the battery cell 20 from leaking out.
  • any two adjacent sub-rivet portions 21151 are welded to each other. That is, welding reinforcement is performed at the riveting position of each layer of the sub-terminal connection portion 21137, which, on the one hand, improves the connection strength between each layer of the sub-terminal connection portion 21137; on the other hand, increases the flow area of the current collecting component 211, reduces the internal resistance, reduces the temperature rise, and improves the The safety performance of the battery cell 20 is improved.
  • the terminal connection portion 2113 is provided with a fixing structure 2115 , in which all sub-rivet portions 21151 are stacked in sequence and cooperate with each other. That is, a plurality of sub-rivet portions 21151 are stacked to form a fixing structure 2115 .
  • the fixing structure 2115 is a structure used to position and fix two parts to be connected when they are connected to each other
  • the sub-riveting part 21151 is also a structure used to position and fix two parts to be connected when they are connected to each other.
  • the multiple sub-riveting parts 21151 cooperate with each other to position and fix the two parts to be connected, that is, to position and fix the two adjacent sub-terminal connecting parts 21137.
  • the sub-rivet parts 21151 of the sub-terminal connection parts 21137 of adjacent layers are stacked to form a fixed structure 2115, which is accurately positioned and easy to align, and does not require a welding process, thereby improving the production efficiency of the current collecting component 211.
  • the riveting of the sub-rivet parts 21151 of the sub-terminal connection parts 21137 of adjacent layers can reduce burrs.
  • the fixing structure 2115 is disposed at the end region of the terminal connection portion 2113 close to the electrode terminal 216. That is, the fixing structure 2115 is disposed at the first connection section 21131 of the terminal connection portion 2113. In this way, the terminal connection portions 21137 of each layer can be riveted to form a terminal connection portion 2113 of an integral structure.
  • the fixing structure 2115 is disposed at the end region of the terminal connection portion 2113 close to the tab connection portion 2111. That is, the fixing structure 2115 is disposed at the second connection section 21133 of the terminal connection portion 2113. In this way, after the sub-terminal connection portions 21137 of each layer are riveted to form the terminal connection portion 2113 of the integral structure, the terminal connection portion 2113 of the integral structure can be conveniently riveted to the tab connection portion 2111.
  • the fixing structure 2115 is disposed at the end region of the terminal connection portion 2113 close to the electrode terminal 216, and at the end region of the terminal connection portion 2113 close to the tab connection portion 2111. That is, the first connection segment 21131 of the terminal connection portion 2113 is provided with the fixing structure 2115, and the second connection segment 21133 of the terminal connection portion 2113 is also provided with the fixing structure 2115.
  • each layer of sub-terminal connecting parts 21137 can be riveted to form an integrated terminal connecting part 2113; on the other hand, after each layer of sub-terminal connecting parts 21137 are riveted to form an integrated terminal connecting part 2113, the integrated terminal connecting part 2113 can be conveniently riveted and connected with the pole ear connecting part 2111; on the other hand, the opposite ends of the terminal connecting part 2113 are provided with fixing structures 2115, so that the bonding force at the two ends of the integrated terminal connecting part 2113 is relatively uniform and the overall bonding is more firmly.
  • the number of the fixing structures 2115 is one or more.
  • the one fixing structure 2115 can be arranged at the first connecting section 21131 of the terminal connecting portion 2113 (as shown in FIG. 15), or at the second connecting section 21131 of the terminal connecting portion 2113.
  • the segment 21133 can also be arranged at the bending segment 21135 of the terminal connecting portion 2113, which is not limited here. No matter where the fixing structure 2115 is arranged at the terminal connecting portion 2113, the positioning accuracy of the sub-terminal connecting portions 21137 of any adjacent layers when riveted can be ensured.
  • the multiple fixing structures 2115 can be all set in the first connecting section 21131 of the terminal connecting part 2113, or all set in the second connecting section 21133 of the terminal connecting part 2113, or all set in the bending section 21135 of the terminal connecting part 2113.
  • a portion of the multiple fixing structures 2115 is arranged on the first connecting section 21131 of the terminal connecting portion 2113, and the rest is arranged on the second connecting section 21133 of the terminal connecting portion 2113, as shown in Figures 11 and 16; alternatively, a portion of the multiple fixing structures 2115 is arranged on the first connecting section 21131 of the terminal connecting portion 2113, and the rest is arranged on the bending section 21135 of the terminal connecting portion 2113; alternatively, a portion of the multiple fixing structures 2115 is arranged on the second connecting section 21133 of the terminal connecting portion 2113, and the rest is arranged on the bending section 21135 of the terminal connecting portion 2113; alternatively, a portion of the multiple fixing structures 2115 is arranged on the first connecting section 21131 of the terminal connecting portion 2113, another portion is arranged on the second connecting section 21133 of the terminal connecting portion 2113, and another portion is arranged on the bending section 21135 of the terminal connecting portion 2113.
  • the cross-sectional shape of the fixing structure 2115 includes any one of a square, a rectangle and a circle.
  • the cross section of the fixing structure 2115 is the cross section of the sub-rivet portion 21151, that is, the plane obtained by cutting the sub-rivet portion 21151 by a plane parallel to the upper surface of the sub-terminal connecting portion 21137.
  • the cross-sectional shape of the fixing structure 2115 is not limited, and can be any one of square, rectangle, circle, and other polygons, thereby reducing the design difficulty of the terminal connecting portion 2113, thereby simplifying the production of the current collecting member 211.
  • the cross-sectional shapes of the multiple fixing structures 2115 may be the same or different.
  • the cross-sectional shapes of the plurality of fixing structures 2115 are the same. Specifically, the cross-sectional shape of the fixing structure 2115 on the first connecting section 21131 of the terminal connecting portion 2113 is a rectangle, and the cross-sectional shape of the fixing structure 2115 on the second connecting section 21133 of the terminal connecting portion 2113 is also a rectangle.
  • the cross-sectional shapes of the plurality of fixing structures 2115 are designed to be the same, which can simplify the manufacturing process of the terminal connecting portion 2113.
  • the cross-sectional shapes of the plurality of fixing structures 2115 are at least partially different.
  • the cross-sectional shape of the fixing structure 2115 on the first connecting section 21131 of the terminal connecting portion 2113 is rectangular
  • the cross-sectional shape of the fixing structure 2115 on the second connecting section 21133 of the terminal connecting portion 2113 is partially rectangular and partially circular.
  • the cross-sectional shapes of the fixed structure 2115 are designed to be different, which can make it easier to position during riveting, avoid riveting misalignment, and have a fool-proof effect.
  • the terminal connection portion 2113 has a first main surface 21138 and a second main surface 21139 that are oppositely arranged along its thickness direction after being unfolded.
  • the fixing structure 2115 has a concave portion formed on one side of the first main surface 21138, and the fixing structure 2115 has a first convex portion formed on the second main surface 21139.
  • the first main surface 21138 is the partial area remaining on the surface of the terminal connection part 2113 facing away from the tab connection part 2111 except the concave part
  • the second main surface 21139 is the partial area remaining on the surface of the terminal connection part 2113 facing the tab connection part 2111 except the first convex part.
  • the first convex portion is a structure in which the terminal connection portion 2113 of a flat sheet structure is punched and formed to be convex relative to the second main surface 21139, and correspondingly, the concave portion is a spatial structure in which the terminal connection portion 2113 of a flat sheet structure is punched and formed to be concave relative to the first main surface 21138, as shown in Figures 13 and 15.
  • the concave portion is still a spatial structure in which the terminal connection portion 2113 of a flat sheet structure is punched and formed to be concave relative to the first main surface 21138, and the first convex portion is not convex relative to the second main surface 21139, but is flush with the second main surface 21139, and the first convex portion is only defined relative to the concave portion.
  • the fixing structure 2115 includes a first convex portion and a concave portion, which can avoid misalignment during stacking when riveting to form the terminal connection portion 2113, accurately position and easily align, and does not require a welding process, thereby improving the production efficiency of the current collecting member 211.
  • the fixing structure 2113 includes a first convex portion and a concave portion, which can also reduce burrs.
  • the tab connection portion 2111 is disposed on a side of the terminal connection portion 2113 close to the second main surface 21139, and the tab connection portion 2111 is provided with a first accommodation portion 2117, and the first convex portion of the fixing structure 2115 is accommodated in the first accommodation portion 2117.
  • the first convex portion of the fixing structure 2115 is accommodated in the first accommodation portion 2117, which can play a positioning role when the terminal connection portion 2113 is connected to the tab connection portion 2111.
  • the first accommodation portion 2117 may be a through hole or a groove.
  • the setting position of the first accommodation portion 2117 corresponds to the setting position of the fixing structure 2115 on the second connecting segment 21133, and the number of the first accommodation portions 2117 corresponds to the number of the fixing structures 2115 on the second connecting segment 21133. Specifically, when the number of the fixing structures 2115 on the second connecting segment 21133 is one, the number of the first accommodation portion 2117 is also one; when the number of the fixing structures 2115 on the second connecting segment 21133 is multiple, the number of the first accommodation portions 2117 is also multiple.
  • the cross-sectional shape of the fixing structure 2115 is not limited and can be any one of square, rectangle and circle
  • the cross-sectional shape of the first receiving portion 2117 is also not limited and can be any one of square, rectangle and circle, and it is only necessary to match the cross-sectional shape of the fixing structure 2115 with the cross-sectional shape of the corresponding first receiving portion 2117.
  • the design difficulty of the tab connection portion 2111 is reduced, and the production of the current collecting component 211 is further simplified.
  • the terminal connection portion 2113 is fixedly connected to the tab connection portion 2111 via the first protrusion.
  • the first accommodating portion 2117 is also a structure for positioning and fixing when two components to be connected are connected to each other.
  • the fixing structure 2115 cooperates with the first accommodating portion 2117 to position and/or fix the two components to be connected, that is, to position and/or fix the pole lug connecting portion 2111 and the terminal connecting portion 2113.
  • the terminal connecting portion 2113 can be connected to the pole lug connecting portion 2111 by riveting.
  • the positioning accuracy of the terminal connecting portion 2113 when connected to the pole lug connecting portion 2111 is improved, and no welding process is required, thereby improving the production efficiency of the current collecting component 211.
  • the number of first accommodating portions 2117 may also be greater than the number of fixing structures 2115 on the second connecting section 21133.
  • the fixing structure 2115 may be riveted to the other extra first accommodating portions 2117.
  • the terminal connecting portion 2113 and the pole lug connecting portion 2111 may need to be staggered in the width direction.
  • riveting the fixing structure 2115 with the other extra first accommodating portions 2117 can achieve staggered installation of the terminal connecting portion 2113 and the pole lug connecting portion 2111 in the width direction, thereby facilitating the installation of other parts in the battery cell 20.
  • each sub-rivet portion 21151 has a sub-protrusion and a sub-recess, each sub-protrusion protrudes in the direction of the second main surface 21139, each sub-recess is recessed from the first main surface 21138 toward the second main surface 21139, and the sub-protrusion of one sub-rivet portion 21151 of two adjacent sub-rivet portions 21151 accommodates and is fixedly connected to the sub-recess of the other sub-rivet portion 21151.
  • the riveting of the sub-protrusions and sub-recesses of the sub-terminal connecting parts 21137 of adjacent layers can be achieved through a stamping process.
  • the second-layer sub-terminal connecting part 21137 is stacked on the first-layer sub-terminal connecting part 21137 and is stamped in alignment with the area where the fixed structure 2115 is to be formed. This allows the second-layer sub-terminal connecting part 21137 to be riveted to the first-layer sub-terminal connecting part 21137, and sub-protrusions and sub-recesses are formed on both the first-layer sub-terminal connecting part 21137 and the second-layer sub-terminal connecting part 21137.
  • the third-layer sub-terminal connecting part 21137 is stacked on the second-layer sub-terminal connecting part 21137 and is stamped in alignment with the sub-recesses of the second-layer sub-terminal connecting part 21137.
  • the third-layer sub-terminal connecting part 21137 can be riveted to the second-layer sub-terminal connecting part 21137, and sub-protrusions and sub-recesses can be formed on the third-layer sub-terminal connecting part 21137;
  • the fourth-layer sub-terminal connecting part 21137 is stacked on the third-layer sub-terminal connecting part 21137 and is punched to align with the sub-recess of the third-layer sub-terminal connecting part 21137, so that the fourth-layer sub-terminal connecting part 21137 can be riveted to the third-layer sub-terminal connecting part 21137, and sub-protrusions and sub-recesses can be formed on the fourth-layer sub-terminal connecting part 21137; by stacking and riveting in this way, the sub-terminal
  • the riveting of the sub-protrusions and sub-recesses of the sub-terminal connection parts 21137 of adjacent layers can avoid misalignment during stacking, and the positioning is accurate and easy to align. At the same time, no welding process is required, which improves the production efficiency of the current collecting component 211.
  • the riveting of the sub-protrusions and sub-recesses of the sub-terminal connection parts 21137 of adjacent layers can reduce burrs.
  • the sub-terminal connecting portions 21137 of adjacent layers are The riveting between the sub-protrusions of the outermost sub-terminal connecting portion 21137 and the accommodating portion 2117 can be performed in a continuous mold.
  • a continuous die refers to a cold stamping die that uses a strip of stamping raw materials in one stamping stroke of a press machine, and uses several different workstations on a set of dies to simultaneously complete multiple stamping processes. Each time the die completes a stamping operation, the material strip moves once at a fixed distance until the product is completed. Specifically, assuming that the terminal connection portion 2113 includes three layers of sub-terminal connection portions 21137, there are two workstations on the die, and each workstation corresponds to a current collecting component 211.
  • the sub-terminal connection portion 21137 serves as the first layer (outermost layer) of the sub-terminal connection portion 21137, and the first layer of the sub-terminal connection portion 21137 is stamped , so that the sub-protrusion on it is riveted to the accommodating portion 2117 (groove or through hole) on the connecting area 21111 of the pole ear connecting portion 2111 pre-placed in the mold, and a sub-recess is formed on the first main surface 21138 side of the first-layer sub-terminal connecting portion 21137; then, the material strip is moved at a fixed distance until there is a material strip in the area corresponding to the two stations, and the mold punches the material strip for the second time, and the material strip is blanked at the same time.
  • the sub-terminal connecting portion 21137 serves as the second-layer sub-terminal connecting portion 21137, and the second-layer sub-terminal connecting portion 21 137 is punched so that the sub-protrusion thereon is punched into the first-layer sub-terminal connecting part 21137 from the sub-recess on the first-layer sub-terminal connecting part 21137 to form a riveted connection, and a sub-recess is formed on the first main surface 21138 side of the second-layer sub-terminal connecting part 21137; finally, the material strip is moved again at a fixed distance until there is a material strip again in the area corresponding to the two stations, and the mold punches the material strip for the third time, and the material strip is blanked at the same time.
  • the sub-terminal connecting part 21137 serves as the third-layer sub-terminal connecting part 21137.
  • the three-layer sub-terminal connection part 21137 is punched so that the sub-protrusion thereon is punched from the sub-recess on the second-layer sub-terminal connection part 21137 into the second-layer sub-terminal connection part 21137 to form a riveted connection, and a sub-recess is formed on the first main surface 21138 side of the third-layer sub-terminal connection part 21137, thereby simultaneously realizing the connection between the terminal connection part 2113 and the pole ear connection part 2111 of the two current collecting components 211 on the two workstations, and the riveting between the sub-terminal connection parts 21137 of adjacent layers.
  • the riveting between the sub-terminal connecting parts 21137 of adjacent layers and the riveting between the sub-terminal connecting parts 21137 of the outermost layer and the pole ear connecting part 2111 are performed in the continuous mold.
  • the continuous mold can automatically realize overlapping riveting, thereby improving the positioning accuracy of the current collecting component 211 and realizing mass production at the same time, thereby improving the production efficiency of the current collecting component 211.
  • the sub-protrusions and sub-recesses of the sub-terminal connecting parts 21137 of adjacent layers have an interference fit
  • the sub-protrusions of the sub-terminal connecting parts 21137 of the outermost layer have an interference fit with the accommodating part 2117.
  • the riveting of the sub-protrusions of the outermost sub-terminal connection part 21137 and the receiving part 2117 can be achieved through a stamping process. After stamping, the sub-protrusions of the outermost sub-terminal connection part 21137 and the receiving part 2117 are interference-fitted. The interference fit makes the connection between the terminal connection part 2113 and the pole lug connection part 2111 more secure, and the two are not easily separated, thereby improving the working stability of the current collecting component 211.
  • the riveting between the sub-protrusions and sub-recesses of the sub-terminal connection parts 21137 of adjacent layers can also be achieved through a stamping process. After stamping, the sub-protrusions and sub-recesses of the sub-terminal connection parts 21137 of adjacent layers are interference-fitted. The interference fit makes the connection between the multiple layers of sub-terminal connection parts 21137 more secure.
  • a second accommodating portion 2118 is provided on the terminal connecting portion, and a second protrusion 2119 is provided on the tab connecting portion, and the second protrusion 2119 is accommodated in the second accommodating portion 2118 .
  • the end area (second connecting section 21133) of the terminal connecting part 2113 close to the pole lug connecting part 2111 may also be provided with a second accommodating portion 2118.
  • the second protrusion 2119 is accommodated in the cavity 2118, which can improve the positioning accuracy when the terminal connecting part 2113 is connected to the pole lug connecting part 2111.
  • each layer of the sub-terminal connection portion 21137 is provided with a sub-accommodation portion 21181, and a plurality of sub-accommodation portions 21181 are aligned and connected to form a second accommodation portion 2118, and the second convex portion 2119 can be accommodated in the second accommodation portion 2118.
  • the second accommodation portion 2118 can be a through hole that penetrates the first main surface 21138 and the second main surface 21139, or a groove that penetrates the second main surface 21139 but does not penetrate the first main surface 21138.
  • the second convex portion 2119 is accommodated in the second accommodation portion 2118, which improves the positioning accuracy when the terminal connection portion 2113 is connected to the tab connection portion 2111, thereby improving the production efficiency of the current collecting component 211.
  • some of the sub-terminal connecting portions 21137 are provided with sub-accommodating portions 21181, which are aligned and connected to form a second accommodating portion 2118 together, while other terminal connecting portions 21137 may not have sub-accommodating portions 21181.
  • the second accommodating portion 2118 is a groove that passes through the second main surface 21139 but not the first main surface 21138.
  • the second protrusion 2119 can also be accommodated in the second accommodating portion 2118 which is a groove.
  • the tab connection portion 2111 is fixedly connected to the terminal connection portion 2113 via the second protrusion 2119 .
  • each layer of the sub-terminal connection portion 21137 is provided with a sub-accommodation portion 21181, and a plurality of sub-accommodation portions 21181 are aligned and connected to form a second accommodation portion 2118, and the second convex portion 2119 can be interference-fitted (fixedly connected) in the second accommodation portion 2118 by a riveting process.
  • the second accommodation portion 2118 can be a through hole that penetrates the first main surface 21138 and the second main surface 21139, or a groove that penetrates the second main surface 21139 but does not penetrate the first main surface 21138.
  • the second convex portion 2119 is directly riveted to the second accommodation portion 2118, which improves the positioning accuracy when the terminal connection portion 2113 and the tab connection portion 2111 are riveted, saves welding technology, and thus improves the production efficiency of the current collecting component 211.
  • some of the sub-terminal connecting portions 21137 are provided with sub-accommodating portions 21181, which are aligned and connected to form a second accommodating portion 2118 together, while other terminal connecting portions 21137 do not have sub-accommodating portions 21181.
  • the second accommodating portion 2118 is a groove that passes through the second main surface 21139 but not the first main surface 21138.
  • the second protrusion 2119 can also be directly riveted to the second accommodating portion 2118.
  • the terminal connection portion 2113 and the tab connection portion 2111 are at least partially welded together.
  • the second connection section 21133 is welded to the connection area 21111 of the tab connection part 2111.
  • the weld mark formed between the terminal connection part 2113 and the tab connection part 2111 is located outside the fixed structure 2115.
  • the second connection section 21133 is welded to the area outside the fixed structure 2115 on the connection area 21111, that is, the non-riveted position between the terminal connection part 2113 and the tab connection part 2111 is welded and reinforced, which increases the flow area of the current collecting component 211, reduces the internal resistance, reduces the temperature rise, and improves
  • the connection between the terminal connection portion 2113 and the pole ear connection portion 2111 is more firmly connected, and the two are not easily separated, thereby improving the working stability of the current collecting component 211.
  • the weld mark formed between the terminal connection part 2113 and the pole lug connection part 2111 may also be located in the area where the fixed structure 2115 is located.
  • the second connection section 21133 is welded to the area where the fixed structure 2115 is located on the connection area 21111, that is, the riveting position between the terminal connection part 2113 and the pole lug connection part 2111 is welded and strengthened, which on the one hand increases the flow area of the current collecting component 211, reduces the internal resistance, reduces the temperature rise, and improves the safety performance of the battery cell 20 (shown in Figure 3); on the other hand, the connection between the terminal connection part 2113 and the pole lug connection part 2111 is made firmer, and the two are not easy to separate, which improves the working stability of the current collecting component 211.
  • the second connecting segment 21133 is welded to the connecting area 21111 of the tab connecting portion 2111 by at least one of ultrasonic welding, molecular diffusion welding, and laser welding.
  • Ultrasonic welding is to convert the current into high-frequency electric energy through an ultrasonic generator, and then convert the high-frequency electric energy into mechanical motion through a transducer, and finally transmit the mechanical motion to the welding head through a horn, and the welding head transmits the received vibration energy to the interface between the second connecting section 21133 and the pole ear connection part 2111, and the vibration energy is converted into heat energy by friction.
  • the heat energy is gathered at the interface between the second connecting section 21133 and the pole ear connection part 2111 to make the interface melt quickly, and after a certain pressure is applied, the interface between the second connecting section 21133 and the pole ear connection part 2111 is fused into one.
  • the pole ear connection part 2111 and the terminal connection part 2113 can be compacted by applying pressure to prevent the occurrence of false welding, and ensure the firmness of the pole ear connection part 2111 and the terminal connection part 2113 after welding.
  • ultrasonic welding can achieve metal bonding between the pole ear connection part 2111 and the terminal connection part 2113 in a shorter time and at a lower temperature.
  • Molecular diffusion welding is a welding method that allows the pole lug connection part 2111 and the terminal connection part 2113 to form a joint by diffusing molecules at the interface between the two at a certain temperature and a certain pressure.
  • the connection area 21111 of the pole lug connection part 2111 and the second connection section 21133 of the terminal connection part 2113 are made of the same material, there is no heat-affected zone at the welding point, so there is no residual stress and no melting defect.
  • the welding temperature of molecular diffusion welding is low, the damage to the pole lug connection part 2111 and the terminal connection part 2113 is small, the welding precision is high, and the deformation is small.
  • Laser welding is a method of welding by using a focused laser beam as energy to generate heat to bombard the interface between the tab connection part 2111 and the terminal connection part 2113. Laser welding ensures the firmness of the tab connection part 2111 and the terminal connection part 2113 after welding. The laser welding speed is fast, the welding depth is large, and the deformation of the welding part between the tab connection part 2111 and the terminal connection part 2113 is small.
  • the terminal connection portion 2113 is bent between the pole tab connection portion 2111 and the electrode terminal 216.
  • the terminal connection portion 2113 is bent between the pole tab connection portion 2111 and the electrode terminal 216, which can reduce the height space occupied by the current collecting member 211 in the battery cell 20, on the one hand, making the structure of the battery cell 20 more compact, and on the other hand, at the same height of the battery cell 20, more space can be vacated for the pole piece in the electrode assembly 25, thereby increasing the energy density of the battery cell 20.
  • the present application further provides a battery 100 , comprising a battery cell 20 according to any of the above embodiments.
  • the battery 100 uses the battery cell 20 in the embodiment of the first aspect, and in the top cover assembly 21 of the battery cell 20, the multi-layer sub-terminal connection part 21137 of the current collecting member 211 has a stronger bending ability and is not easy to break, thereby ensuring the working stability of the battery 100; at the same time, under the condition of the same bending ability, the overall thickness of the multi-layer sub-terminal connection part 21137 can be made thicker, so that the flow area of the current collecting member 211 is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery 100.
  • the multi-layer sub-terminal connection part 21137 is bent to a greater extent, which can also reduce the height space occupied by the current collecting member 211, improve the energy density of the battery cell 20, and then also improve the energy density of the battery 100.
  • the present application further provides an electrical device, the electrical device comprising a battery 100 of any of the above embodiments, the battery 100 being used to provide electrical energy.
  • the electric device uses the battery 100 in the embodiment of the second aspect, and in the battery cell 20 of the battery 100, the multi-layer sub-terminal connection part 21137 of the current collecting member 211 in the top cover assembly 21 has a stronger bending ability and is not easy to break, thereby ensuring the working stability of the electric device; at the same time, under the condition of the same bending ability, the overall thickness of the multi-layer sub-terminal connection part 21137 can be made thicker, so that the flow area of the current collecting member 211 is increased, the internal resistance is reduced, and the temperature rise is reduced, thereby improving the safety of the battery 100.
  • the multi-layer sub-terminal connection part 21137 is bent to a greater extent, which can also reduce the height space occupied by the current collecting member 211, improve the energy density of the battery cell 20, thereby also improving the energy density of the battery 100, and then improve the battery life of the electric device.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种电池单体（20）、电池（100）及用电装置。电池单体（20）包括外壳（23）、电极组件（25）、电极端子（216）及集流构件（211）。外壳（23）用于容纳电极组件（25）。电极组件（25）包括极耳（251）。电极端子（216）设置于外壳（23）。集流构件（211）包括极耳连接部（2111）和端子连接部（2113）。极耳连接部（2111）用于连接极耳（251）。端子连接部（2113）用于连接电极端子（216）。端子连接部（2113）包括层叠设置的多层子端子连接部（21137），每层子端子连接部（21137）均包括子铆接部（21151），任意相邻两个子铆接部（21151）铆接固定。

Description

电池单体、电池及用电装置 技术领域
本申请涉及电池技术领域，具体涉及一种电池单体、电池及用电装置。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
集流构件是电池中用于连接电极端子和电极组件的极耳的部件，为了减小集流构件在电池内占据的高度空间，集流构件的端子连接部通常会设计成能够折弯，然而，现有的集流构件的端子连接部多为单层的一体结构，折弯能力有限，为了方便折弯，端子连接部的厚度就不能制作的太厚，导致集流构件的过流面积较小，内阻较大，温升也较大，进而降低了电池的安全性。
发明内容
鉴于上述问题，本申请提供一种电池单体、电池及用电装置，能够缓解集流构件的过流面积较小，内阻较大，温升也较大，进而降低电池的安全性的问题。
第一方面，本申请提供了一种电池单体。所述电池单体包括电极组件、外壳、电极端子及集流构件。所述电极组件包括极耳。所述外壳用于容纳所述电极组件。所述电极端子设置于所述外壳。所述集流构件包括极耳连接部和端子连接部，所述极耳连接部用于连接所述极耳，所述端子连接部用于连接所述电极端子和所述极耳连接部。所述端子连接部包括层叠设置的多层子端子连接部，每层所述子端子连接部均包括子铆接部，任意相邻两个所述子铆接部铆接固定。
本申请实施例的技术方案中，集流构件的端子连接部设计成层叠的多层子端子连接部，相较于单层一体结构的集流构件而言，多层子端子连接部之间的结合力较小，在折弯时层与层之间更能容忍变形，由此使得多层子端子连接部的折弯能力更强，在相同的折弯能力的情况下，多层子端子连接部的总体厚度(即端子连接部的厚度)可以制作得较厚，过流面积增大，内阻减小，温升降低，从而提升了电池的安全性。另外，多层子端子连接部更大程度地被折弯也能减小会集流构件占据的高度空间，提升了电池单体的能量密度，进而也提升了电池的能量密度。同时，任意相邻两层子端子连接部利用相邻两个子铆接部铆接固定而实现铆接连接，相较于各层子端子连接部采用焊接工艺连接形成端子连接部而言，提高了端子连接部连接时的定位精度，且无需焊接工艺，提升了集流构件的生产效率。
在某些实施例中，任意相邻两个所述子铆接部之间焊接连接。即，在各层子端子连接部的铆接位置进行了焊接加强，一方面提升了各层子端子连接部之间的连接强度；另一方面增加了集流 构件的过流面积，减小内阻，降低温升，提升了电池单体的安全性能。
在某些实施例中，所述端子连接部设有固定结构，在固定结构中，所有所述子铆接部依次层叠设置且相互配合。
相较于先冲裁多个单层的子端子连接部后，再将多个单层子端子连接部层叠起来进行焊接以形成端子连接部的方式而言，相邻层的子端子连接部的子铆接部之间层叠形成固定结构，定位精准，且容易对齐，同时无需焊接工艺，提升了集流构件的生产效率。相较于通过材料卷成多层后进行裁切获得多层结构的端子连接部而言，相邻层的子端子连接部的子铆接部的铆接能够减少毛刺。
在某些实施例中，所述固定结构设置于所述端子连接部的靠近所述电极端子的端部区域。如此，各层子端子连接部可铆接形成一体结构的端子连接部。
在某些实施例中，所述固定结构设置于所述端子连接部的靠近所述极耳连接部的端部区域。如此，在各层子端子连接部铆接形成一体结构的端子连接部后，一体结构的端子连接部能够很方便地与极耳连接部铆接连接。
在某些实施例中，所述固定结构设置于所述端子连接部靠近所述电极端子的端部区域，和设置于所述端子连接部的靠近所述极耳连接部的端部区域。如此，一方面，各层子端子连接部可铆接形成一体结构的端子连接部；另一方面，在各层子端子连接部铆接形成一体结构的端子连接部后，一体结构的端子连接部能够很方便地与极耳连接部铆接连接；再一方面，端子连接部的相对两端均设置有固定结构，使得一体结构的端子连接部的两端的结合力比较均匀，整体结合得更牢固。
在某些实施例中，所述固定结构的数量为一个或多个。固定结构的数量为一个时，保证了任意相邻层的子端子连接部铆接时的定位精度。固定结构的数量为多个时，多个固定结构不仅能保证任意相邻层的子端子连接部铆接时的定位精度，还能提升子端子连接部之间的连接强度，彼此不容易脱离，从而提升了集流构件的工作稳定性。
在某些实施例中，所述固定结构的横截面形状包括正方形、长方形及圆形中的任意一种。固定结构的横截面形状并不受限制，可为正方形、长方形及圆形中的任意一种，降低了端子连接部的设计难度，从而简化了集流构件的制作。
在某些实施例中，所述端子连接部展开后沿自身厚度方向具有相对设置的第一主表面和第二主表面，所述固定结构在所述第一主表面的一侧形成有凹部，所述固定结构在所述第二主表面形成有第一凸部。固定结构包括第一凸部和凹部，在铆接形成端子连接部时能够避免堆叠时的错层，定位精准，且容易对齐，同时无需焊接工艺，提升了集流构件的生产效率。另外，固定结构包括第一凸部和凹部，还能够减少毛刺。
在某些实施例中，所述极耳连接部设置于所述端子连接部靠近所述第二主表面的一侧，所述 极耳连接部设有第一容纳部，所述第一凸部容纳于所述第一容纳部。第一凸部容纳于第一容纳部，在端子连接部与极耳连接部连接时可起到定位作用。
在某些实施例中，所述端子连接部通过所述第一凸部固定连接于所述极耳连接部。第一凸部固定连接于第一容纳部，从而实现端子连接部通过第一凸部固定连接于极耳连接部，相较于端子连接部采用焊接工艺连接于极耳连接部而言，提高了端子连接部与极耳连接部连接时的定位精度，且无需焊接工艺，提升了集流构件的生产效率。
在某些实施例中，每个所述子铆接部均具有子凸起和子凹部，各所述子凸起均面向所述第二主表面的方向凸出，各所述子凹部均从所述第一主表面朝向所述第二主表面的方向凹陷，相邻两个所述子铆接部中的一个所述子铆接部的子凸起容纳且固定连接于另一个所述子铆接部的子凹部。
相较于先冲裁多个单层的子端子连接部后，再将多个单层子端子连接部层叠起来进行焊接以形成端子连接部的方式而言，相邻层的子端子连接部的子凸起与子凹部之间铆接能够避免堆叠时的错层，定位精准，且容易对齐，同时无需焊接工艺，提升了集流构件的生产效率。相较于通过材料卷成多层后进行裁切获得多层结构的端子连接部而言，相邻层的子端子连接部的子凸起与子凹部铆接能够减少毛刺。
在某些实施例中，所述端子连接部上设有第二容纳部，所述极耳连接部设有第二凸部，所述第二凸部容纳于所述第二容纳部。第二凸部容纳于第二容纳部，可提升端子连接部与极耳连接部连接时的定位精度。
在某些实施例中，所述极耳连接部通过所述第二凸部固定连接于所述端子连接部。第二凸部固定连接于第二容纳部，从而实现极耳连接部通过第二凸部固定连接于端子连接部，相较于极耳连接部采用焊接工艺连接于端子连接部而言，提高了极耳连接部与端子连接部连接时的定位精度，且无需焊接工艺，提升了集流构件的生产效率。
在某些实施例中，所述端子连接部和所述极耳连接部至少部分焊接连接。即，在端子连接部和极耳连接部之间进行了焊接加强，一方面增加了集流构件的过流面积，减小内阻，降低温升，提升了电池单体的安全性能；另一方面使端子连接部与极耳连接部之间的连接更为牢固，二者不容易脱离，提升了集流构件的工作稳定性。
在某些实施例中，所述端子连接部和所述极耳连接部之间形成的焊印位于所述固定结构以外的区域。端子连接部和极耳连接部之间形成的焊印位于固定结构以外的区域，一方面增加了集流构件的过流面积，减小内阻，降低温升，提升了电池单体的安全性能；另一方面在不破坏铆接的同时，使端子连接部与极耳连接部之间的连接更为牢固，二者不容易脱离，提升了集流构件的工作稳定性。
在某些实施例中，所述端子连接部弯折地设置于所述极耳连接部与所述电极端子之间。端子 连接部弯折地设置于极耳连接部与电极端子之间，能够减小集流构件在电池单体中占据的高度空间，一方面使电池单体的结构更为紧凑，另一方面，在相同的电池单体的高度下，能够腾出更多的空间给电极组件，从而增加电池单体的能量密度。
第二方面，本申请提供了一种电池，包括上述任一实施例所述的电池单体。
本申请实施例的技术方案中，电池使用了第一方面的实施例中的电池单体，且在该电池单体中，集流构件的多层子端子连接部的折弯能力更强，不容易断裂，从而保证了电池的工作稳定性；同时，在相同的折弯能力的情况下，多层子端子连接部的总体厚度可以制作得较厚，过流面积增大，内阻减小，温升降低，从而提升了电池的安全性。另外，多层子端子连接部更大程度地被折弯也能减小会集流构件占据的高度空间，提升了电池单体的能量密度，进而也提升了电池的能量密度。
第三方面，本申请提供了一种用电装置，包括上述任一实施例所述的电池，所述电池用于提供电能。
本申请实施例的技术方案中，用电装置使用了第二方面的实施例中的电池，且在该电池的电池单体中，集流构件的多层子端子连接部的折弯能力更强，不容易断裂，从而保证了用电装置的工作稳定性；同时，在相同的折弯能力的情况下，多层子端子连接部的总体厚度可以制作得较厚，过流面积增大，内阻减小，温升降低，从而提升了电池的安全性。另外，多层子端子连接部更大程度地被折弯也能减小会集流构件占据的高度空间，提升了电池单体的能量密度，从而也提升了电池的能量密度，进而提升了用电装置的续航时间。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施例。
附图说明
通过阅读对下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在全部附图中，用相同的附图标号表示相同的部件。在附图中：
图1为本申请一些实施例的车辆的结构示意图；
图2为本申请一些实施例的电池的分解结构示意图；
图3为本申请一些实施例的电池单体的立体结构示意图；
图4为本申请一些实施例的顶盖组件的立体结构示意图；
图5为本申请一些实施例的顶盖组件的分解结构示意图；
图6为本申请一些实施例的顶盖组件的平面结构示意图；
图7为图6所示的顶盖组件沿线VII-VII的剖面示意图；
图8为图6所示的顶盖组件沿线VIII-VIII的剖面示意图；
图9为本申请一些实施例的集流构件的立体结构示意图；
图10为本申请一些实施例的集流构件的分解结构示意图；
图11为本申请一些实施例的集流构件中端子连接部的立体结构示意图；
图12为本申请一些实施例的集流构件的平面结构示意图；
图13为图12所示的集流构件沿线XIII-XIII的剖面示意图；
图14为本申请一些实施例的集流构件的平面结构示意图；
图15为图14所示的集流构件沿线XV-XV的剖面示意图；
图16为本申请一些实施例的集流构件的立体结构示意图。
具体实施例中的附图标号如下：
车辆1000；
电池100，控制器200，马达300；
箱体10，第一部分11，第二部分12；
电池单体20，顶盖组件21、集流构件211、极耳连接部2111、连接区21111、焊接区21113、端子连接部2113、第一连接段21131、第二连接段21133、弯折段21135、固定结构2115、子铆接部21151、第一容纳部2117、第二容纳部2118、子容纳部21181、第二凸部2119、子端子连接部21137、顶盖片212、第一绝缘件213、第二绝缘件214、连接件215、电极端子216、密封件217；外壳23；电极组件25。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文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；本文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。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“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。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，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，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；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或两个元件的相互作用关系。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实施例中的具体含义。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
本发明人注意到，目前通用的电池是将电极组件的极耳揉平，集流构件和极耳焊接后，集流构件进行折弯并和电极端子电连接，从而实现电流的导出。这就对集流构件的过流能力要求较高。但是，集流构件的端子连接部为了方便折弯和工艺焊接(集流构件和电极组件的极耳的焊接)不能制作得太厚，所以端子连接部的过流面积S就很小，另外折弯工序需要三折端子连接部，所以端子连接部长度L也比较长，根据电阻计算公式R＝ρ*L/S可知，端子连接部的内阻就会变得比较大，过流和内阻要求均无法满足功率型电池的要求。
为了缓解集流构件的过流面积较小，内阻较大，温升也较大，进而降低电池的安全性的问题，发明人研究发现，可以将集流构件的端子连接部设计成层叠的多层子端子连接部。相较于单层一体结构的集流构件而言，多层子端子连接部之间的结合力较小，在折弯时层与层之间更能容忍变形，由此使得多层结构的端子连接部的折弯能力更强，在相同的折弯能力的情况下，多层结构的端子连接部的总体厚度可以制作得较厚，集流构件的过流面积便会较大，内阻较小，温升降低， 从而可以提升电池的安全性。
基于以上考虑，为了将集流构件的端子连接部设计成层叠的多层子端子连接部，发明人还发现：将材料叠加多层后进行裁切获得的多层结构的端子连接部会产生大量边缘毛刺，而先冲裁多个单层的子端子连接部后，再将多个单层子端子连接部层叠起来进行焊接得到的多层结构的端子连接部会无法对齐，且焊接时效率较低，这两种制作方式均无法实现批量生产。发明人经过深入研究，设计了一种用于电池单体的集流构件，集流构件的端子连接部设计成层叠的多层子端子连接部，任意相邻两层的子端子连接部之间铆接，没有毛刺，定位精度高，容易对齐，且无需焊接工艺，提升了端子连接部的生产效率，容易量产。
本申请实施例公开的电池单体可以用于使用电池作为电源的用电装置或者使用电池作为储能元件的各种储能系统。用电装置可以但不限于为手机、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、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，电池单体20容纳于箱体10内。其中，箱体10用于为电池单体20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一部分11和第二部分12，第一部分11与第二部分12相互盖合，第一部分11和第二部分12共同限定出用于容纳电池单体20的容纳空间。第二部分12可以为一端开口的空心结构，第一部分11可以为板状结构，第一部分11盖合于第二部分12的开口侧，以使第一部分11与第二部分12共同限定出容纳空间；第一部分11和第二部分12也可以是均为一侧开口的空心结构，第一部分11的开口侧盖合于第二部分12的开口侧。当然，第一部分11和第二部分12形成的箱体10可以是多种形状，比如，圆柱体、长方体等。
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、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、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、并联或混联组成电池模块形式，多个电池模块再串联、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。电池单体20是指组成电池100的最小单元。在本申请中，电池单体20以圆柱电池为例进行说明。
请参阅图3，为根据本申请一些实施例的电池单体20。电池单体20包括外壳23、电极组件25、电极端子216及集流构件211。外壳23用于容纳电极组件25。电极组件25包括极耳251。电极端子216设置于外壳23。请结合图9及图10，集流构件211包括极耳连接部2111和端子连接部2113。极耳连接部2111用于连接极耳251。端子连接部2113用于连接电极端子216和极耳连接部2111。请结合图13，端子连接部2113包括层叠设置的多层子端子连接部21137，每层子端子连接部21137均包括子铆接部21151，任意相邻两个子铆接部21151铆接固定。
外壳23可以为圆柱体结构，且外壳23内部形成容纳腔，用于容纳电极组件25和电解液。外壳23的两端设有开口，使电极组件25可通过开口放置于外壳23的容纳腔。其中，外壳23可由金属材料制成，例如由铝或铝合金等制成，也可以由绝缘材料制成，例如由塑胶、橡胶等制成。
电极组件25包括极片单元和从至少一个端面延伸出的极耳251。具体地，沿电池单体20的高度方向(H)，极片单元具有相对设置的两端面，在该电池单体20中，极片单元的两端面分别延伸出极耳251，分别为正极耳和负极耳。其中，该极片单元包括负极片、正极片和隔离膜，隔离膜位于相邻负极片与正极片之间，用于隔开负极片与正极片。
在一种可能的设计中，负极片、隔离膜与正极片三者顺序层叠并卷绕，形成电极组件25的极片单元，即该极片单元为卷绕式结构。同时，极片单元形成后具有缝隙，电解液能够通过缝隙进入极片单元内，浸润负极片与正极片。
负极片包括负极集流体(例如铜箔)和涂覆在负极集流体表面的负极活性物质层(例如碳或硅)，正极片包括正极集流体(例如铝箔)和涂覆在正极集流体表面的正极活性物质层(例如三元材料、磷酸铁锂或钴酸锂)。负极耳与负极片相连，并从极片单元中伸出，且负极耳可直接由负极集流体裁切而成，正极耳与正极片相连，并从极片单元中伸出，且正极耳可直接由正极集流体裁切形成。
电极端子216是可以用于将电极组件25中电流导出至电池100外部、以输出或输入电池单体20的电能的功能性部件。电极端子216包括正极电极端子和负极电极端子，正极电极端子和负极电极端子分别位于极片单元的两端。每个电极端子216的一端伸入电池单体20的内部，另 一端的端面暴露于电池单体20的外部，并可以与外部电连接件连接。
集流构件211是用于封盖电池单体20的开口、连接开口内电极组件25的极耳251、以及连接电池单体20的电极端子216的部件。集流构件211需要使用导电的金属材料制成，以保证与极耳251和电极端子216连接后能够作为极耳251和电极端子216之间的良好导体。本申请实施例使用的集流构件211可以应用于圆柱形电池单体20，也可以用于其他形状的电池单体20，例如长方体形状。
请参阅图3、图9及图10，极耳连接部2111是集流构件211封盖在电池单体20的外壳23的开口上的部分，极耳连接部2111可以设置成与电池单体20的外壳23的开口形状相适配的形状，例如近似圆形。同时，极耳连接部2111还用于与电极组件25的极耳251焊接。其中，极耳连接部2111的焊接区21113是用于焊接电极组件25的极耳251的区域，可以根据焊接极耳251的需要设置合适的面积以及位置。极耳连接部2111的连接区21111则是用于连接端子连接部2113的区域，极耳连接部2111的连接区21111设置在不影响极耳251与极耳连接部2111焊接的位置，即极耳连接部2111的连接区21111设置在极耳连接部2111除去焊接区21113后剩余的区域。连接区21111可以是占据极耳连接部2111除去焊接区21113后的部分区域，例如占据极耳连接部2111除去焊接区21113后的左侧区域或右侧区域。当然，连接区21111还可以是占据极耳连接部2111除去焊接区21113后的全部区域，例如占据极耳连接部2111除去焊接区21113后的左侧区域和右侧区域。此外，本申请实施例提供的集流构件211不对极耳连接部2111的焊接区21113和连接区21111的形状做限制。
请继续参阅图5、图9及图10，端子连接部2113是集流构件211上用于连接电极端子216的部件。端子连接部2113与连接区21111连接，以保证集流构件211作为传导电流的部件使用。端子连接部2113的材料与极耳连接部2111的材料可以由同一种导电的金属材料制成，也可以由不同种导电的金属材料制成，只要保证集流构件211分别与极耳251和电极端子216连接后能够作为极耳251和电极端子216之间的良好导体即可。端子连接部2113的长度较极耳连接部2111的长度要长。具体地，请结合图8，端子连接部2113包括第一连接段21131、第二连接段21133、及位于第一连接段21131和第二连接段21133之间的弯折段21135。第一连接段21131与第二连接段21133分别位于展开后的端子连接部2113沿自身长度方向上的相对两端，第一连接段21131用于与电极端子216连接，第二连接段21133用于与极耳连接部2111连接，并位于连接区21111。弯折段21135是端子连接部2113的用于连接第一连接段21131和第二连接段21133之间的区域，具有较佳的弯折性能。弯折段21135可在与第一连接段21131连接的位置弯折，弯折段21135还可在与第二连接段21133连接的位置弯折，使弯折后的集流构件211呈Z形。
端子连接部2113包括层叠设置的多层子端子连接部21137，其中，每层子端子连接部21137均相同，可方便通过相同的工艺批量成型。多层子端子连接部21137相互堆叠，并采用结合工艺 将多层固定在一起，形成一个整体结构的端子连接部2113。具体地，请结合图13，每层子端子连接部21137均包括子铆接部21151，任意相邻两个子铆接部21151铆接固定。
铆接是两个待连接部件，通过在其上打孔，然后将铆钉放进去并采用铆钉枪铆死，从而将两个待连接部件连接在一起的工艺或方法。而本申请中任意相邻两层子端子连接部21137之间彼此之间的铆接连接，本申请的铆接并未借助铆钉，而是直接将任意相邻两层子端子连接部21137之间铆死，而实现各层子端子连接部21137的连接。
本申请实施例的技术方案中，集流构件211的端子连接部2113设计成层叠的多层子端子连接部21137，相较于单层一体结构的集流构件而言，多层子端子连接部21137之间的结合力较小，在折弯时层与层之间更能容忍变形，由此使得多层子端子连接部21137的折弯能力更强，在相同的折弯能力的情况下，多层子端子连接部21137的总体厚度(即端子连接部2113的厚度)可以制作得较厚，过流面积增大，内阻减小，温升降低，从而提升了电池100(图2示)的安全性。另外，多层子端子连接部21137更大程度地被折弯也能减小集流构件211占据的高度空间，提升了电池单体20的能量密度，进而也提升了电池100的能量密度。同时，任意相邻两层子端子连接部21137之间利用相邻两个子铆接部21151铆接固定而实现铆接连接，相较于各层子端子连接部采用焊接工艺连接而言，提高了端子连接部2113连接时的定位精度，且无需焊接工艺，提升了集流构件211的生产效率。
根据本申请的一些实施例，可选地，请参阅图3，电池单体20还包括顶盖组件21。电极组件25收容于外壳23内。电极组件25的相对两端分别设有正极极耳和负极极耳。顶盖组件21盖合于外壳23的两端的开口，正极极耳和负极极耳均与顶盖组件21中集流构件211的极耳连接部2111(图9示)连接。
顶盖组件21是盖合于电池单体20的外壳23的开口上，为位于外壳23内部的电极组件25和电解液等提供密闭空间的部件，电极组件25的电能通过顶盖组件21的电极端子216被引出至外部。
电池单体20的相对两端均设有顶盖组件21，多层子端子连接部21137的折弯能力更强，在相同的折弯能力的情况下，多层子端子连接部21137的总体厚度可以制作得较厚，使得集流构件211的过流面积增大，内阻减小，温升降低，从而提升了电池100(图2示)的安全性。另外多层子端子连接部21137更大程度地被折弯也能减小会两端的顶盖组件21中集流构件211占据的高度空间，在相同的电池单体20的高度下，两端都能够腾出更多的空间分别给正负极片，从而进一步增加电池单体20的能量密度。
根据本申请的一些实施例，可选地，请参阅图4及图5，顶盖组件21包括集流构件211、顶盖片212、第一绝缘件213、第二绝缘件214、连接件215及电极端子216。具体地，请参阅图5至图8，顶盖片212包括相背的第一侧和第二侧。第一绝缘件213安装于顶盖片212的第一侧。 第二绝缘件214安装于顶盖片212的第二侧。连接件215安装于第一绝缘件213的背离顶盖片212的一侧。集流构件211安装于第二绝缘件214的背离顶盖片212的一侧。电极端子216穿设集流构件211的第一连接段21131、第二绝缘件214、顶盖片212、第一绝缘件213及连接件215，电极端子216的相对两端分别与连接件215和集流构件211的第一连接段21131连接。
请一并参阅图3及图4，顶盖片212是指盖合于外壳23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，顶盖片212的形状可以与外壳23的开口形状相适应以配合外壳23。可选地，顶盖片212可以由具有一定硬度和强度的材质(如铝合金)制成，这样，顶盖片212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。顶盖片212的第一侧为背离外壳23内部的一侧，顶盖片212的第二侧为朝向外壳23内部的一侧。
请参阅图5，连接件215是顶盖片212上用于铆接电极端子216的一端的部件，连接件215可以采用铝制成。第一绝缘件213和第二绝缘件214为设置于顶盖片212上起到电绝缘作用的部件，第一绝缘件213和第二绝缘件214均由绝缘材料制成，例如塑胶、橡胶等。第一绝缘件213位于顶盖片212的第一侧，用于承载连接件215，并使连接件215与顶盖片212之间电绝缘。第二绝缘件214位于顶盖片212的第二侧，用于收容集流构件211，并使集流构件211与顶盖片212之间电绝缘。第一绝缘件213和第二绝缘件214的设置可降低短路的风险。
请参阅图7和图8，电极端子216的相对两端分别与连接件215和集流构件211的第一连接段21131连接，集流构件211的第二连接段21133通过极耳连接部2111与电极组件25的极耳251连接，以将电极组件25的电流依次经过极耳251、集流构件211、电极端子216导出至第一侧的连接件215。第一绝缘件213和第二绝缘件214设置于顶盖片212的相背两侧，可使顶盖片212绝缘，降低短路的风险。
根据本申请的一些实施例，可选地，请参阅图5和图7，顶盖组件21还包括密封件217，密封件217套设于电极端子216，并位于顶盖片212与电极端子216之间，用于密封顶盖片212与电极端子216之间的间隙。
密封件217是一种用于起到密封作用以防止电池100内的电解液外漏的功能性部件。密封件217的材质可以是诸如橡胶、塑料等弹性材料。密封件217的形状可呈圆环形、方环形等，只需要与电极端子216的外周壁的形状匹配，且能穿设在顶盖片212与电极端子216之间的间隙即可。密封件217位于电极端子216和顶盖片212之间以填充间隙，可避免位于电池单体20内部的电解液外漏。
根据本申请的一些实施例，可选地，请参阅图13，任意相邻两个子铆接部21151之间焊接连接。即，在各层子端子连接部21137的铆接位置进行了焊接加强，一方面提升了各层子端子连接部21137之间的连接强度；另一方面增加了集流构件211的过流面积，减小内阻，降低温升，提 升了电池单体20的安全性能。
根据本申请的一些实施例，可选地，请参阅图10至图13，端子连接部2113设有固定结构2115，在固定结构2115中，所有子铆接部21151依次层叠设置且相互配合。即，多个子铆接部21151层叠形成一个固定结构2115。
固定结构2115是一种用于在两个待连接部件相互连接时起到定位和固定作用的结构，子铆接部21151也是一种用于在两个待连接部件相互连接时起到定位和固定作用的结构。多个子铆接部21151之间相互配合，以定位和固定连接两个待连接部件，即定位和固定连接相邻的两个子端子连接部21137。
相较于先冲裁多个单层的子端子连接部后，再将多个单层子端子连接部层叠起来进行焊接以形成端子连接部的方式而言，相邻层的子端子连接部21137的子铆接部21151之间层叠形成固定结构2115，定位精准，且容易对齐，同时无需焊接工艺，提升了集流构件211的生产效率。相较于通过材料卷成多层后进行裁切获得多层结构的端子连接部而言，相邻层的子端子连接部21137的子铆接部21151的铆接能够减少毛刺。
根据本申请的一些实施例，可选地，请参阅图5、图13及图15，固定结构2115设置于端子连接部2113的靠近电极端子216的端部区域。即，固定结构2115设置于端子连接部2113的第一连接段21131。如此，各层子端子连接部21137可铆接形成一体结构的端子连接部2113。
根据本申请的一些实施例，可选地，请参阅图5及图13，固定结构2115设置于端子连接部2113的靠近极耳连接部2111的端部区域。即，固定结构2115设置于端子连接部2113的第二连接段21133。如此，在各层子端子连接部21137铆接形成一体结构的端子连接部2113后，一体结构的端子连接部2113能够很方便地与极耳连接部2111铆接连接。
根据本申请的一些实施例，可选地，请参阅图5及图13，固定结构2115设置于端子连接部2113的靠近电极端子216的端部区域，和设置于端子连接部2113的靠近极耳连接部2111的端部区域。即，端子连接部2113的第一连接段21131设置有固定结构2115，端子连接部2113的第二连接段21133也设置有固定结构2115。如此，一方面，各层子端子连接部21137可铆接形成一体结构的端子连接部2113；另一方面，在各层子端子连接部21137铆接形成一体结构的端子连接部2113后，一体结构的端子连接部2113能够很方便地与极耳连接部2111铆接连接；再一方面，端子连接部2113的相对两端均设置有固定结构2115，使得一体结构的端子连接部2113的两端的结合力比较均匀，整体结合得更牢固。
根据本申请的一些实施例，可选地，请参阅图11、图15和图16，固定结构2115的数量为一个或多个。
请参阅图14和图15，固定结构2115的数量为一个时，该一个固定结构2115可以设置在端子连接部2113的第一连接段21131(如图15所示)，也可以设置在端子连接部2113的第二连接 段21133，还可以设置在端子连接部2113的弯折段21135，在此不做限制。无论该一个固定结构2115设置在端子连接部2113的何处，均能保证任意相邻层的子端子连接部21137铆接时的定位精度。
请参阅图11和图16，固定结构2115的数量为多个时，该多个固定结构2115可以均设置在端子连接部2113的第一连接段21131，也可以均设置在端子连接部2113的第二连接段21133，还可以均设置在端子连接部2113的弯折段21135。或者，该多个固定结构2115中的一部分设置在端子连接部2113的第一连接段21131，其余部分设置在端子连接部2113的第二连接段21133，如图11和图16所示；或者，该多个固定结构2115中的一部分设置在端子连接部2113的第一连接段21131，其余部分设置在端子连接部2113的弯折段21135；或者，该多个固定结构2115中的一部分设置在端子连接部2113的第二连接段21133，其余部分设置在端子连接部2113的弯折段21135；再或者，该多个固定结构2115中的一部分设置在端子连接部2113的第一连接段21131，另一部分设置在端子连接部2113的第二连接段21133，还有一部分设置在端子连接部2113的弯折段21135。无论该多个固定结构2115设置在端子连接部2113的何处，不仅能保证任意相邻层的子端子连接部21137铆接时的定位精度，还能提升子端子连接部21137之间的连接强度，彼此不容易脱离，从而提升了集流构件211的工作稳定性。
根据本申请的一些实施例，可选地，请参阅图11，固定结构2115的横截面形状包括正方形、长方形及圆形中的任意一种。
请参阅图11、图13及图15，固定结构2115的横截面即为子铆接部21151的横截面，也即子铆接部21151被平行于子端子连接部21137的上表面的平面截得的平面。固定结构2115的横截面形状并不受限制，可为正方形、长方形、圆形、及其他多边形中的任意一种，由此，降低了端子连接部2113的设计难度，从而简化了集流构件211的制作。
根据本申请的一些实施例，可选地，请参阅图11和图16，固定结构2115的数量为多个，且该多个固定结构2115中的一部分设置在端子连接部2113的第一连接段21131，其余部分设置在端子连接部2113的第二连接段21133时，多个固定结构2115的横截面形状可以相同，也可以不相同。
请一并参阅图11至图13，在一个例子中，多个固定结构2115的横截面形状均相同。具体地，端子连接部2113的第一连接段21131上的固定结构2115的横截面形状为矩形，端子连接部2113的第二连接段21133上的固定结构2115的横截面形状也为矩形。多个固定结构2115的横截面形状设计成相同，能够简化端子连接部2113的制作工艺。
请参阅图16，在另一个例子中，多个固定结构2115的横截面形状至少部分不同。具体地，端子连接部2113的第一连接段21131上的固定结构2115的横截面形状为矩形，端子连接部2113的第二连接段21133上的固定结构2115的横截面形状一部分为矩形，另一部分为圆形。多个固 定结构2115的横截面形状设计成不同，能够在铆接时更容易定位，避免铆接错位，具有防呆效果。
根据本申请的一些实施例，可选地，请参阅图13及图15，端子连接部2113展开后沿自身厚度方向具有相对设置的第一主表面21138和第二主表面21139。固定结构2115在第一主表面21138的一侧形成有凹部，固定结构2115在第二主表面21139形成有第一凸部。
其中，第一主表面21138为端子连接部2113的背离极耳连接部2111的表面除却凹部后剩余的部分区域，第二主表面21139为端子连接部2113的朝向极耳连接部2111的表面除却第一凸部后剩余的部分区域。
在一个例子中，第一凸部为平整的片状结构的端子连接部2113被冲压形成的相对第二主表面21139外凸的结构，对应地，凹部为平整的片状结构的端子连接部2113被冲压形成的相对第一主表面21138内凹的空间结构，如图13和图15所示。在另一个例子中，凹部仍为平整的片状结构的端子连接部2113被冲压形成的相对第一主表面21138内凹的空间结构，而第一凸部并不相对第二主表面21139外凸，而是与第二主表面21139齐平，第一凸部只是相对凹部而言来定义的。
固定结构2115包括第一凸部和凹部，在铆接形成端子连接部2113时能够避免堆叠时的错层，定位精准，且容易对齐，同时无需焊接工艺，提升了集流构件211的生产效率。另外，固定结构2113包括第一凸部和凹部，还能够减少毛刺。
根据本申请的一些实施例，可选地，请参阅图12和图13，极耳连接部2111设置于端子连接部2113靠近第二主表面21139的一侧，极耳连接部2111设有第一容纳部2117，固定结构2115的第一凸部容纳于第一容纳部2117。固定结构2115的第一凸部容纳于第一容纳部2117，在端子连接部2113与极耳连接部2111连接时可起到定位作用。
其中，第一容纳部2117可以为通孔或凹槽。第一容纳部2117的设置位置与第二连接段21133上的固定结构2115的设置位置对应，第一容纳部2117的数量与第二连接段21133上的固定结构2115的数量对应。具体地，当第二连接段21133上的固定结构2115的数量为一个时，则第一容纳部2117的数量也为一个；当第二连接段21133上的固定结构2115的数量为多个时，则第一容纳部2117的数量也为多个。
另外，由于固定结构2115的横截面形状并不受限制，可为正方形、长方形及圆形中的任意一种。对应地，第一容纳部2117的横截面形状也不受限制，也可为对应的正方形、长方形及圆形中的任意一种，只需要满足固定结构2115的横截面形状与对应的第一容纳部2117的横截面形状匹配即可。由此，降低了极耳连接部2111的设计难度，进一步简化了集流构件211的制作。
根据本申请的一些实施例，可选地，请参阅图12和图13，端子连接部2113通过第一凸部固定连接于极耳连接部2111。
此时，第一容纳部2117也是一种用于在两个待连接部件相互连接时起到定位和固定作用的结构。固定结构2115与第一容纳部2117之间相互配合，以定位和/或固定连接两个待连接部件，即定位和/或固定极耳连接部2111和端子连接部2113。在固定结构2115的第一凸起固定连接(铆接)于第一容纳部2117时，可实现端子连接部2113通过铆接方式连接于极耳连接部2111，相较于端子连接部2113采用焊接工艺连接于极耳连接部2111而言，提高了端子连接部2113与极耳连接部2111连接时的定位精度，且无需焊接工艺，提升了集流构件211的生产效率。
同时，第一容纳部2117的数量也可以大于第二连接段21133上的固定结构2115的数量，一方面，在其中某个第一容纳部2117出现了损坏，固定结构2115还可以与多出来的其他第一容纳部2117进行铆接；另一方面，在需要考虑电池单体20中其他零件的安装的情况下，可能需要端子连接部2113与极耳连接部2111在宽度方向上进行错位安装，那么固定结构2115与多出来的其他第一容纳部2117铆接能够实现端子连接部2113与极耳连接部2111在宽度方向上的错位安装，从而方便电池单体20中其他零件的安装。
根据本申请的一些实施例，可选地，请参阅图13，在某些实施例中，每个子铆接部21151均具有子凸起和子凹部，各子凸起均面向第二主表面21139的方向凸出，各子凹部均从第一主表面21138朝向第二主表面21139的方向凹陷，相邻两个子铆接部21151中的一个子铆接部21151的子凸起容纳且固定连接于另一个子铆接部21151的子凹部。
相邻层的子端子连接部21137的子凸起与子凹部铆接可以通过冲压工艺实现，例如，第二层子端子连接部21137叠放在第一层子端子连接部21137上并对准待形成固定结构2115的区域进行冲压，便可使第二层子端子连接部21137与第一层子端子连接部21137铆接，并在第一层子端子连接部21137和第二层子端子连接部21137上均形成子凸起和子凹部；然后，第三层子端子连接部21137叠放在第二层子端子连接部21137上并对准第二层子端子连接部21137的子凹部进行冲压，便可使第三层子端子连接部21137与第二层子端子连接部21137铆接，并在第三层子端子连接部21137上形成子凸起和子凹部；接着，第四层子端子连接部21137叠放在第三层子端子连接部21137上并对准第三层子端子连接部21137的子凹部进行冲压，便可使第四层子端子连接部21137与第三层子端子连接部21137铆接，并在第四层子端子连接部21137上形成子凸起和子凹部；如此层叠铆接，便可将各层子端子连接部21137铆接连接成一个整体结构的端子连接部2113。
相较于先冲裁多个单层的子端子连接部后，再将多个单层子端子连接部层叠起来进行焊接以形成端子连接部的方式而言，相邻层的子端子连接部21137的子凸起与子凹部铆接能够避免堆叠时的错层，定位精准，且容易对齐，同时无需焊接工艺，提升了集流构件211的生产效率。相较于通过材料卷成多层后进行裁切获得多层结构的端子连接部而言，相邻层的子端子连接部21137的子凸起与子凹部铆接能够减少毛刺。
根据本申请的一些实施例，可选地，请参阅图12至图15，相邻层的子端子连接部21137之 间的铆接、及最外层的子端子连接部21137的子凸起与容纳部2117之间的铆接可于连续模中执行。
连续模指的是压力机在一次冲压行程中，采用带状冲压原材料，在一副模具上用几个不同的工位同时完成多道冲压工序的冷冲压冲模，模具每冲压完成一次，料带定距移动一次，直至产品完成。具体地，假设端子连接部2113包括三层子端子连接部21137，模具上有两个工位，每个工位对应一个集流构件211。在先执行最外层的子端子连接部21137的子凸起与极耳连接部2111上容纳部2117之间的铆接，再执行相邻层的子端子连接部21137的子凸起与子凹部铆接的情况下，则在两个工位同时执行以下步骤：模具第一次冲压与两个工位对应的料带，料带同时落料，该子端子连接部21137作为第一层(最外层)子端子连接部21137，该第一层子端子连接部21137被冲压，使其上的子凸起与预先置于模具内极耳连接部2111的连接区21111上的容纳部2117(凹槽或通孔)铆接，并在第一层子端子连接部21137的第一主表面21138侧形成子凹部；接着，料带定距移动直至与两个工位对应的区域又有料带，模具第二次冲压料带，料带又同时落料，此时子端子连接部21137作为第二层子端子连接部21137，该第二层子端子连接部21137被冲压，使其上的子凸起从第一层子端子连接部21137上的子凹部冲压进第一层子端子连接部21137而形成铆接，并在第二层子端子连接部21137的第一主表面21138侧形成子凹部；最后，料带再次定距移动直至与两个工位对应的区域再一次有料带，模具第三次冲压料带，料带又同时落料，此时，子端子连接部21137作为第三层子端子连接部21137，该第三层子端子连接部21137被冲压，使其上的子凸起从第二层子端子连接部21137上的子凹部冲压进第二层子端子连接部21137上而形成铆接，并在第三层子端子连接部21137的第一主表面21138侧形成子凹部，便可同时实现两个工位上的两个集流构件211中各自的端子连接部2113与极耳连接部2111的连接，以及相邻层的子端子连接部21137之间的铆接。
在连续模中执行相邻层的子端子连接部21137之间的铆接、及最外层的子端子连接部21137与极耳连接部2111的铆接，连续模能自动实现叠铆，提高了集流构件211的定位精度，同时还能实现批量生产，提高了集流构件211的生产效率。
根据本申请的一些实施例，可选地，请参阅图12至图15，相邻层的子端子连接部21137的子凸起与子凹部之间过盈配合，最外层的子端子连接部21137的子凸起与容纳部2117过盈配合。
最外层的子端子连接部21137的子凸起与容纳部2117铆接可以通过冲压工艺实现，冲压后，最外层的子端子连接部21137的子凸起与容纳部2117过盈配合，过盈配合使端子连接部2113与极耳连接部2111之间的连接更为牢固，二者不容易脱离，提升集流构件211的工作稳定性。相邻层的子端子连接部21137的子凸起与子凹部之间的铆接也可以通过冲压工艺实现，冲压后，相邻层的子端子连接部21137的子凸起与子凹部之间过盈配合，过盈配合使多层子端子连接部21137之间的连接更为牢固。
根据本申请的一些实施例，可选地，请参阅图14和图15，端子连接部上设有第二容纳部2118，极耳连接部设有第二凸部2119，第二凸部2119容纳于第二容纳部2118。
在固定结构2115设置于端子连接部2113靠近电极端子216的端部区域(第一连接段21131)的情况下，端子连接部2113的靠近极耳连接部2111的端部区域(第二连接段21133)还可开设有第二容纳部2118，此时，第二凸部2119容纳于腔体2118内，可提升端子连接部2113与极耳连接部2111连接时的定位精度。
具体地，在一个例子中，每层子端子连接部21137均开设有子容纳部21181，多个子容纳部21181对准连通，并共同形成第二容纳部2118，第二凸部2119可容纳于第二容纳部2118内。其中，第二容纳部2118可以为贯穿第一主表面21138和第二主表面21139的通孔，也可以为贯穿第二主表面21139，而不贯穿第一主表面21138的凹槽。第二凸部2119容纳于第二容纳部2118，提高了端子连接部2113与极耳连接部2111连接时的定位精度，进而提升了集流构件211的生产效率。在另一个例子中，部分子端子连接部21137开设有子容纳部21181，这些子容纳部21181对准连通并共同形成第二容纳部2118，而其他端子连接部21137可不开设子容纳部21181，此时，第二容纳部2118为贯穿第二主表面21139，而不贯穿第一主表面21138的凹槽，同样地，第二凸部2119也可容纳于为凹槽的第二容纳部2118内。
根据本申请的一些实施例，可选地，请参阅图14和图15，极耳连接部2111通过第二凸部2119固定连接于端子连接部2113。
具体地，在一个例子中，每层子端子连接部21137均开设有子容纳部21181，多个子容纳部21181对准连通，并共同形成第二容纳部2118，第二凸部2119可通过铆接工艺过盈配合(固定连接)于第二容纳部2118内。其中，第二容纳部2118可以为贯穿第一主表面21138和第二主表面21139的通孔，也可以为贯穿第二主表面21139，而不贯穿第一主表面21138的凹槽。第二凸部2119与第二容纳部2118直接铆接，提高了端子连接部2113与极耳连接部2111铆接时的定位精度，节省了焊接工艺，进而提升了集流构件211的生产效率。在另一个例子中，部分子端子连接部21137开设有子容纳部21181，这些子容纳部21181对准连通并共同形成第二容纳部2118，而其他端子连接部21137不开设子容纳部21181，此时，第二容纳部2118为贯穿第二主表面21139，而不贯穿第一主表面21138的凹槽，同样地，第二凸部2119也可与第二容纳部2118直接铆接。
根据本申请的一些实施例，可选地，请参阅图10，端子连接部2113和极耳连接部2111至少部分焊接连接。
第二连接段21133焊接于极耳连接部2111的连接区21111。在一个例子中，端子连接部2113和极耳连接部2111之间形成的焊印位于固定结构2115以外的区域。第二连接段21133焊接于连接区21111上固定结构2115以外的区域，即在端子连接部2113和极耳连接部2111之间的非铆接位置进行了焊接加强，一方面增加了集流构件211的过流面积，减小内阻，降低温升，提升了 电池单体20(图3示)的安全性能；另一方面使端子连接部2113与极耳连接部2111之间的连接更为牢固，二者不容易脱离，提升了集流构件211的工作稳定性。
在另一个例子中，端子连接部2113和极耳连接部2111之间形成的焊印还可位于固定结构2115所在区域。第二连接段21133焊接于连接区21111上固定结构2115所在的区域，即在端子连接部2113和极耳连接部2111之间的铆接位置进行了焊接加强，一方面增加了集流构件211的过流面积，减小内阻，降低温升，提升了电池单体20(图3示)的安全性能；另一方面使端子连接部2113与极耳连接部2111之间的连接更为牢固，二者不容易脱离，提升了集流构件211的工作稳定性。
根据本申请的一些实施例，可选地，请参阅图10，第二连接段21133通过超声波焊、分子扩散焊、及激光焊中的至少一种方式焊接于极耳连接部2111的连接区21111。
超声波焊接是通过超声波发生器将电流转换成高频电能，再通过换能器将高频电能转换成机械运动，最后通过变幅杆将机械运动传递至焊头，焊头将接收到的振动能量传递到第二连接段21133与极耳连接部2111的交界面处，振动能量通过摩擦方式转换成热能，热能聚集在第二连接段21133与极耳连接部2111的交界面处使交界面快速融化，加上一定压力后，使第二连接段21133与极耳连接部2111的交界面融合成一体。采用超声波焊，能够通过施加压力将极耳连接部2111与端子连接部2113压实，防止出现虚焊，保证极耳连接部2111与端子连接部2113焊接后的牢固性，同时，超声波焊能在较短时间及较低温度下实现极耳连接部2111与端子连接部2113之间的金属粘接。
分子扩散焊是使极耳连接部2111与端子连接部2113在一定的温度和一定压力下，通过高温使二者交界面之间的分子扩散后形成接合的焊接方法。采用分子扩散焊，若极耳连接部2111的连接区21111与端子连接部2113的第二连接段21133为同种材料，则焊接处没有热影响区，因此没有残余应力，也不存在融化的缺陷。另外，分子扩散焊的焊接温度低，对极耳连接部2111与端子连接部2113的损伤小，焊接精度高，变形小。
激光焊是以聚焦的激光束作为能源轰击极耳连接部2111与端子连接部2113交界面所产生的热量进行焊接的方法。采用激光焊，在保证极耳连接部2111与端子连接部2113焊接后的牢固性的同时，激光焊的速度快、可焊接深度大、极耳连接部2111与端子连接部2113之间焊接处的变形小。
根据本申请的一些实施例，可选地，请参阅图3、图8和图10，端子连接部2113弯折地设置于极耳连接部2111与电极端子216之间。端子连接部2113弯折地设置于极耳连接部2111与电极端子216之间，能够减小集流构件211在电池单体20中占据的高度空间，一方面使电池单体20的结构更为紧凑，另一方面，在相同的电池单体20的高度下，能够腾出更多的空间给电极组件25中的极片，从而增加电池单体20的能量密度。
第二方面，请参阅图2，本申请还提供了一种电池100，包括上述任一实施例的电池单体20。
本申请实施例的技术方案中，请结合图3及图10，电池100使用了第一方面的实施例中的电池单体20，且在该电池单体20的顶盖组件21中，集流构件211的多层子端子连接部21137的折弯能力更强，不容易断裂，从而保证了电池100的工作稳定性；同时，在相同的折弯能力的情况下，多层子端子连接部21137的总体厚度可以制作得较厚，使集流构件211的过流面积增大，内阻减小，温升降低，从而提升了电池100的安全性。另外，多层子端子连接部21137更大程度地被折弯也能减小会集流构件211占据的高度空间，提升了电池单体20的能量密度，进而也提升了电池100的能量密度。
第三方面，请参阅图1，本申请还提供了一种用电装置，用电装置包括上述任一实施例的电池100，电池100用于提供电能。
本申请实施例的技术方案中，请结合图3及图10，用电装置使用了第二方面的实施例中的电池100，且在该电池100的电池单体20中，顶盖组件21中集流构件211的多层子端子连接部21137的折弯能力更强，不容易断裂，从而保证了用电装置的工作稳定性；同时，在相同的折弯能力的情况下，多层子端子连接部21137的总体厚度可以制作得较厚，使得集流构件211的过流面积增大，内阻减小，温升降低，从而提升了电池100的安全性。另外，多层子端子连接部21137更大程度地被折弯也能减小会集流构件211占据的高度空间，提升了电池单体20的能量密度，从而也提升了电池100的能量密度，进而提升了用电装置的续航时间。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各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，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，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范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (16)

  1. 一种电池单体，其特征在于，包括：
    电极组件，包括极耳；
    外壳，用于容纳所述电极组件；
    电极端子，设置于所述外壳；及
    集流构件，包括极耳连接部和端子连接部，所述极耳连接部用于连接所述极耳，所述端子连接部用于连接所述电极端子，所述端子连接部包括层叠设置的多层子端子连接部，每层所述子端子连接部均包括子铆接部，任意相邻两个所述子铆接部铆接固定。
  2. 根据权利要求1所述的电池单体，其特征在于，任意相邻两个所述子铆接部之间焊接连接。
  3. 根据权利要求1或2所述的电池单体，其特征在于，所述端子连接部设有固定结构，在所述固定结构中，所有所述子铆接部依次层叠设置且相互配合。
  4. 根据权利要求3所述的电池单体，其特征在于，所述固定结构设置于所述端子连接部的靠近所述电极端子的端部区域，和/或设置于所述端子连接部的靠近所述极耳连接部的端部区域。
  5. 根据权利要求3或4所述的电池单体，其特征在于，所述固定结构的数量为一个或多个。
  6. 根据权利要求3-5任意一项所述的电池单体，其特征在于，所述端子连接部展开后沿自身厚度方向具有相对设置的第一主表面和第二主表面，所述固定结构在所述第一主表面的一侧形成有凹部，所述固定结构在所述第二主表面形成有第一凸部。
  7. 根据权利要求6所述的电池单体，其特征在于，所述极耳连接部设置于所述端子连接部靠近所述第二主表面的一侧，所述极耳连接部设有第一容纳部，所述第一凸部容纳于所述第一容纳部。
  8. 根据权利要求7所述的电池单体，其特征在于，所述端子连接部通过所述第一凸部固定连接于所述极耳连接部。
  9. 根据权利要求7或8所述的电池单体，其特征在于，每个所述子铆接部均具有子凸起和子凹部，各所述子凸起均面向所述第二主表面的方向凸出，各所述子凹部均从所述第一主表面朝向所述第二主表面的方向凹陷，相邻两个所述子铆接部中的一个所述子铆接部的子凸起容纳且固定连接于另一个所述子铆接部的子凹部。
  10. 根据权利要求1-9任一项所述的电池单体，其特征在于，所述端子连接部上设有第二容纳部，所述极耳连接部设有第二凸部，所述第二凸部容纳于所述第二容纳部。
  11. 根据权利要求10所述的电池单体，其特征在于，所述极耳连接部通过所述第二凸部固定连接于所述端子连接部。
  12. 根据权利要求1-11任意一项所述的电池单体，其特征在于，所述端子连接部和所述极耳 连接部至少部分焊接连接。
  13. 根据权利要求12所述的电池单体，其特征在于，所述端子连接部和所述极耳连接部之间形成的焊印位于所述固定结构以外的区域。
  14. 根据权利要求1-13任意一项所述的电池单体，其特征在于，所述端子连接部弯折地设置于所述极耳连接部与所述电极端子之间。
  15. 一种电池，其特征在于，包括权利要求1-14任意一项所述的电池单体。
  16. 一种用电装置，其特征在于，所述用电装置包括权利要求15所述的电池，所述电池用于提供电能。
PCT/CN2023/074140 2023-02-01 2023-02-01 电池单体、电池及用电装置 Ceased WO2024159455A1 (zh)

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