WO2022170488A1 - 端盖组件、电池单体、电池、用电装置及制备方法 - Google Patents

端盖组件、电池单体、电池、用电装置及制备方法 Download PDF

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Publication number
WO2022170488A1
WO2022170488A1 PCT/CN2021/076283 CN2021076283W WO2022170488A1 WO 2022170488 A1 WO2022170488 A1 WO 2022170488A1 CN 2021076283 W CN2021076283 W CN 2021076283W WO 2022170488 A1 WO2022170488 A1 WO 2022170488A1
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WO
WIPO (PCT)
Prior art keywords
end cap
electrode
matching portion
matching
out hole
Prior art date
Application number
PCT/CN2021/076283
Other languages
English (en)
French (fr)
Inventor
蔡如来
姜利文
骆福平
朱婷婷
方伍梅
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to CN202180065298.2A priority Critical patent/CN116325305A/zh
Priority to EP21918111.2A priority patent/EP4080654A4/en
Priority to PCT/CN2021/076283 priority patent/WO2022170488A1/zh
Publication of WO2022170488A1 publication Critical patent/WO2022170488A1/zh
Priority to US18/446,716 priority patent/US20230387520A1/en

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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 of a single cell or a single battery
    • 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 of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • 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 of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of batteries, in particular to an end cap assembly, a battery cell, a battery, an electrical device and a preparation method.
  • the present application proposes an end cap assembly, a battery cell, a battery, an electrical device and a preparation method, in order to improve the structural strength of the connector and solve the problem that the connector is easily deformed, resulting in the dislocation of the electrode terminals connected to the connector, and the battery Monomers create leakage problems.
  • an end cap assembly for a battery cell, comprising: an end cap, the end cap is provided with an electrode lead-out hole, and the end cap faces an inner part of the battery cell.
  • the side is provided with a first matching part; an electrode terminal, the electrode terminal is arranged on the end cover and covers the electrode lead-out hole; and a connecting piece is used for electrically connecting the electrode terminal and the battery
  • the connecting member is provided with a second matching portion, and the second matching portion is configured to cooperate with the first matching portion to provide resistance of the connecting member along the direction of the electrode lead-out hole. deformation force.
  • the end cover assembly in this embodiment is matched with each other through the first matching portion and the second matching portion, so that the end cover and the connecting piece can play a role of mutual support at the matched position of the first matching portion and the second matching portion, which improves the
  • the structural strength of the connector makes the deformation resistance of the connector stronger in the radial direction, so as to solve the problem that the connector is prone to deformation due to low structural strength, resulting in the dislocation of the electrode terminal connected to the connector or even from the end cover. There is a problem of leakage of battery cells.
  • the first matching portion and the second matching portion are plug-fitted along the axial direction of the electrode lead-out hole.
  • the first matching portion and the second matching portion are structurally nested with each other, so that the two can interact in the radial direction along the electrode lead-out hole, increasing the deformation of the connector in the radial direction.
  • the difficulty is increased, the structural strength between the end cover and the connecting piece is improved, and the deformation resistance of the connecting piece is improved.
  • one of the first matching portion and the second matching portion is a first connecting protrusion, and the other is a first connecting hole, and the first connecting protrusion is at least partially located at in the corresponding first connection hole, and the first matching portion is arranged on the outer periphery of the electrode lead-out hole.
  • the first matching portion is located on the outer circumference of the electrode lead-out hole, and the part of the first connection convex portion located in the first connection hole will limit the further deformation of the connector along the radial direction of the electrode lead-out hole.
  • the structure of a connecting hole is convenient for the positioning and installation of the end cover and the connecting piece, and the assembly is convenient, which is beneficial to improve the assembly efficiency.
  • the end cap is provided with a plurality of the first fitting parts, and the plurality of the first fitting parts are evenly distributed along the circumference of the electrode lead-out hole;
  • the connecting member is provided with a plurality of The second matching portion is arranged corresponding to the first matching portion.
  • the plurality of first matching parts are evenly distributed along the circumference of the electrode lead-out hole, so that after each first matching part is matched with the corresponding second matching part, the structural strength of each position in the circumferential direction of the electrode lead-out hole of the connector is improved, and the The overall radial deformation resistance of the connector.
  • the first matching portion is a first connecting convex portion, and the projection of the first connecting convex portion along the axial direction at least partially overlaps the electrode terminal.
  • the overlapping part of the projection of the electrode terminal and the first connecting convex part in the axial direction will support the end cover, increase the structural strength of the support part of the end cover, and reduce the deformation of the end cover at the place where the first matching part is provided. possibility, and at the same time, it is beneficial to improve the sealing between the electrode terminal and the end cap.
  • the end cap assembly further includes a first insulating member, the first insulating member is disposed between the end cap and the connecting member, and the first insulating member is provided with an insulating portion, so
  • the insulating part has an accommodating cavity, and the accommodating cavity is used for accommodating the first matching part and/or the second matching part, so as to isolate the end cap and the connecting piece.
  • the first insulating member is arranged between the end cap and the connecting member, and the first insulating member is provided with an insulating portion with an accommodating cavity to wrap the first matching portion and/or the second matching portion, so as to prevent the passage between the end cap and the connecting member.
  • the first mating portion and/or the second mating portion are in contact and conduct, so as to insulate the end cap from the connector.
  • the electrode terminal is provided with a third fitting portion
  • the connecting member is provided with a fourth fitting portion matched with the third fitting portion
  • the fourth fitting portion is matched with the third fitting portion. At least one of the matching portions extends into the electrode lead-out hole and is fixedly connected to the other.
  • the third matching portion and the fourth matching portion are plug-fitted along the axial direction of the electrode lead-out hole.
  • the movement or deformation of the electrode terminal and the connector in the radial direction of the electrode lead-out hole can play a role of mutual restraint.
  • the movement or deformation of the end cap in the radial direction of the electrode lead-out hole will also have a mutual restraint effect, so that the deformation or movement of the electrode terminal, the end cap and the connecting piece will be restrained by each other, and the overall structure will be stable.
  • the electrode terminal is pulled by the bus component, it is more difficult for the electrode terminal and the end cap to be displaced from the end cap in the radial direction of the electrode lead-out hole.
  • the third matching portion includes a second connecting protrusion
  • the fourth matching portion includes a second connecting hole
  • the second connecting protrusion is fixed in the second connecting hole
  • the fourth matching portion further includes a third connecting convex portion, the third connecting convex portion extends along the axial direction of the electrode lead-out hole toward the side of the end cap, the The second connection hole is arranged on the third connection protrusion.
  • the third connection convex portion extends along the axial direction of the electrode lead-out hole toward the side of the end cap, so that the thickness of the third connection convex portion along the axial direction of the electrode lead-out hole increases, and the second connection hole is provided on the third connection convex portion
  • the depth of the second connection hole along its axial direction is increased, and the contact area of the second connection convex portion with the connector in the second connection hole is increased, which is beneficial to improve the reliability of the connection between the electrode terminal and the connector.
  • a side of the connecting member facing away from the electrode lead-out hole is recessed in a direction close to the electrode lead-out hole to form the third connecting protrusion, and the inner peripheral wall of the second connecting hole is along the A flange is formed extending in a direction away from the end cover along the axial direction of the second connection hole, and the flange is in contact with the outer peripheral wall of the third connection protrusion.
  • the third connection convex portion is a convex structure formed by the concave side of the connector away from the electrode lead-out hole to the other side close to the electrode lead-out hole, so that a cavity is formed inside the third connection convex portion, reducing the number of The weight of the three connection protrusions, wherein the inner peripheral wall of the second connection hole extends along its own axial direction away from the end cover to form a flange, which increases the distance between the inner peripheral wall of the second connection hole and the third connection protrusion. Therefore, the strength of the connection structure is ensured, the weight of the end cap assembly is reduced, and the energy density of the battery cell is improved.
  • the third connection protrusion is at least partially accommodated in the electrode lead-out hole.
  • the space occupied by the third connection protrusions in the connecting member inside the battery cell can be reduced, so as to improve the energy density of the battery cell.
  • the connector further includes at least two reinforcing blocks, and the reinforcing blocks and the second matching portion are alternately arranged along the circumference of the electrode lead-out hole.
  • the structural strength of the connecting piece can be further increased.
  • a battery cell comprising: a case, the case having an opening; an electrode assembly, the electrode assembly being accommodated in the case, the electrode assembly including a main body part and an electrode lug; and the end cap assembly according to an embodiment of the first aspect, the end cap covering an opening of the casing to enclose the electrode assembly within the casing, the connector connecting the pole ear and the electrode terminals.
  • a battery which includes the battery cells in the above embodiments.
  • an electrical device which includes the battery cells in the above embodiments, and the battery cells are used for power supply.
  • a method for preparing a battery cell comprising: providing an end cap assembly, the end cap assembly comprising: an end cap, the end cap is provided with an electrode lead-out hole, the end cap The side facing the inside of the battery cell is provided with a first matching portion; an electrode terminal, the electrode terminal is arranged on the end cap and covers the electrode lead-out hole; and a connector, the connector is used for electrical an electrode assembly connecting the electrode terminal and the battery cell, the connecting member is provided with a second fitting portion configured to cooperate with the first fitting portion to provide the connecting member anti-deformation force along the direction of the electrode outlet; providing an electrode assembly, the electrode assembly includes a main body part and a tab; providing a casing, the casing is provided with an opening; accommodating the electrode assembly in the casing , the connecting piece connects the tab and the electrode terminal, and the end cap assembly covers the opening, so as to enclose the electrode assembly in the casing.
  • the first matching part and the second matching part cooperate with each other, so that the end cover and the connecting piece can play a role of mutual support at the position where the first matching part and the second matching part are matched, which improves the structural strength of the connecting piece and makes the connection
  • the deformation resistance of the parts in the radial direction becomes stronger, so as to solve the problem that the connecting parts are prone to deformation due to low structural strength, causing the electrode terminals connected to the connecting parts to be dislocated or even detached from the end caps, causing the battery cells to leak. .
  • FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the application.
  • Fig. 2 is a schematic diagram of the exploded structure of the battery of the embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a battery cell according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of an exploded structure of a battery cell according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an end cap assembly according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of an exploded structure from a perspective of an end cap assembly according to an embodiment of the present application (the connector is in an unfolded state);
  • FIG. 7 is a schematic diagram of an exploded structure from another perspective of the end cap assembly according to the embodiment of the present application (the connector is in a folded state);
  • FIG. 8 is a schematic cross-sectional view of the end cap assembly along the A-A direction according to an embodiment of the present application.
  • FIG. 9 is a schematic cross-sectional structural diagram of the end cap assembly along the A-A direction in another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of the connector in an unfolded state according to an embodiment of the application.
  • FIG. 11 is a schematic flowchart of a method for preparing a battery cell according to an embodiment of the present application.
  • Vehicle 1a, motor; 1b, controller;
  • Electrode terminal 60. Electrode terminal; 61. Third matching part;
  • 80 connecting piece; 81, second matching part; 82, fourth matching part; 83, reinforcing block; 84, bending part; 85, first non-bending part; 86, second non-bending part; 87, The third non-bending part; 821, the second connecting hole; 822, the third connecting convex part; 823, the flange; 831, the radial reinforcing rib; 832, the circumferential reinforcing rib;
  • multiple refers to two or more (including two), and similarly, “multiple groups” refers to two or more groups (including two groups), and “multiple sheets” refers to two or more sheets (includes two pieces).
  • the connector and the electrode terminal are fixed by welding, so that the end cap is directly fixed between the electrode terminal and the connector. Since the thickness of the connector is relatively thin and the structural strength is small, after the welding is fixed, once the battery cell is impacted. , the battery cells will move relative to each other, pulling the confluence components, which will act as a force on the electrode terminals, and the force on the electrode terminals will act on the connectors, causing the connectors to bend and deform along the radial direction of the electrode lead-out holes, and the connectors will be deformed. The positioning of the rear electrode terminals is affected, so that the electrode terminals are prone to dislocation or even detached from the end cap, resulting in liquid leakage, making the battery cells unable to use normally, and affecting the life of the battery.
  • the inventors started from improving the deformation resistance of the connecting parts and enhancing the structural strength of the connecting parts.
  • the structure is designed, and it is found that the structural strength and deformation resistance of the connecting piece can be effectively improved by setting the mutual matching structure on the connecting piece and the end cover.
  • the further improved structural strength and anti-deformation ability of the connector, and the improved anti-deformation ability of the overall structural strength of the end cap assembly improve the sealing performance of the battery cells, and further increase the service life of the battery cells.
  • the embodiment of the present application provides an electrical device using a battery as a power source
  • the electrical device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like.
  • the electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric aircraft toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, and spaceships.
  • FIG. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the application
  • the vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle
  • the new energy vehicle may be a pure electric vehicle car, hybrid car or extended-range car, etc.
  • the vehicle 1 includes a motor 1a, a controller 1b and a battery 10.
  • the controller 1b can be used for the controller 1b and the battery 10 supplies power to the motor 1a.
  • the motor 1a is connected to the wheels through a transmission mechanism to drive the vehicle 1 to move.
  • the battery 10 may be provided in the interior of the vehicle 1 , for example, at the front, rear or bottom of the vehicle 1 .
  • the battery 10 may be a battery pack or a battery module.
  • the battery 10 may be used as an operating power source of the vehicle 1 for the circuit system of the vehicle 1 .
  • the battery 10 is used for the working power requirements of the vehicle 1 when starting, navigating and running.
  • the battery 10 can not only be used as the operating power source of the vehicle 1 , but also can be used as the driving power source of the vehicle 1 to provide driving power for the vehicle 1 in place of or partially in place of fuel or natural gas.
  • FIG. 2 is a schematic diagram of the exploded structure of the battery 10 according to the embodiment of the present application.
  • the battery 10 may include one or more battery modules 13 (or also called is a battery module), wherein a plurality of battery modules 13 can be connected in series, in parallel or in mixed connection, and mixed connection refers to a mixture of series and parallel connection.
  • the battery 10 may also include other structures.
  • the battery 10 includes a box body, and the box body includes a first part 11 and a second part 12 .
  • the battery module 13 is arranged in the box.
  • the embodiments of the present application are not limited thereto.
  • FIG. 3 is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application
  • FIG. 4 is a schematic structural diagram of an exploded battery cell 20 according to an embodiment of the present application.
  • the battery 10 may include one or more battery cells 20 according to different power requirements.
  • one battery 10 may include multiple battery cells 20, and the multiple battery cells 20 may include Connect in series, parallel or hybrid to achieve larger capacity or power.
  • the number of battery cells 20 included in one battery 10 can be set to any value.
  • the battery 10 can be directly composed of a plurality of battery cells 20 connected in series, in parallel or in a mixed connection; it can also be composed of a plurality of battery cells 20 in series, in parallel or in a mixed connection to form a battery module 13, and then composed of a plurality of battery cells 20.
  • the modules 13 are connected in series, parallel or mixed to form the battery 10 .
  • the battery 10 may further include other structures, for example, the battery 10 may further include a bus component for realizing electrical connection between the plurality of battery cells 20 .
  • each battery cell 20 may include, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery or a magnesium-ion battery.
  • the battery cells 20 may be cylindrical, flat, rectangular, or other shapes. In this application, the battery cell 20 is taken as an example in the form of a cylinder for description.
  • the battery cell 20 in the embodiment of the present application includes a casing 30 , an electrode assembly 40 and an end cap assembly 50 .
  • the casing 30 has an opening, and the casing 30 has an inner space for accommodating the electrode assembly 40 and the electrolyte, and the inner space is communicated with the opening.
  • the shape of the body 30 may be cylindrical, cuboid, or other shapes.
  • the end cap assembly 50 covers the opening of the case 30 to enclose the electrode assembly 40 inside the case 30 .
  • the electrode assembly 40 may be formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator, wherein the separator is an insulator between the positive electrode sheets or the negative electrode sheets.
  • Both the positive electrode sheet and the negative electrode sheet include a coated area and an uncoated area, wherein the positive electrode active material is coated on the coated area of the positive electrode sheet, the negative electrode active material is coated on the coated area of the negative electrode sheet, and the active material is coated on the coated area of the negative electrode sheet. Coated on a current collector formed of a thin metal plate, no active material was coated on the uncoated area.
  • the electrode assembly 40 includes a main body and a tab, and the tab is divided into a positive tab and a negative tab.
  • the main body has two opposite ends, and the positive tab and the negative tab are respectively disposed at both ends of the electrode assembly 40 in the first direction (the x-axis direction shown in FIG. 3 and FIG. 4 ). It can be understood that, The first direction may be the length direction of the electrode assembly 40 .
  • the uncoated regions of the positive electrode sheet are stacked to form the positive electrode tabs, and the uncoated regions of the negative electrode sheet are stacked to form the negative electrode tabs.
  • FIG. 5 is a schematic structural diagram of the end cap assembly 50 according to the embodiment of the application
  • FIG. 6 is an exploded structural schematic diagram of the end cap assembly 50 according to the embodiment of the application from a perspective (the connector is not folded). state)
  • FIG. 7 is a schematic diagram of the exploded structure of the end cap assembly 50 from another perspective according to the embodiment of the application (the connector is in a folded state)
  • FIG. 8 is a schematic diagram of the cross-sectional structure of the end cap assembly 50 in the A-A direction in an embodiment of the application .
  • the end cap assembly 50 includes an end cap 70 , an electrode terminal 60 and a connector 80 .
  • the end cap 70 is sealedly connected with the casing 30 , that is, the end cap 70 is sealed and disposed at the opening of the casing 30 .
  • the end cap 70 is provided with an electrode lead-out hole 72, the electrode terminal 60 is provided on the end cap 70, and the electrode terminal 60 covers the electrode lead-out hole 72 to seal the electrode lead-out hole 72.
  • the electrode terminal 60 is electrically connected to the tab of the electrode assembly 40 through the connecting member 80 to ensure that the electrode terminal 60 and the electrode assembly 40 are in normal current conduction.
  • Each of the two ends of the electrode assembly 40 in the first direction is correspondingly provided with an end cap assembly 50 , wherein the electrode terminal 60 of the end cap assembly 50 corresponding to the positive electrode ear is electrically connected to the positive electrode ear through the connecting member 80 , and is electrically connected to the positive electrode ear.
  • the electrode terminal 60 of the end cap assembly 50 corresponding to the negative electrode is electrically connected to the negative electrode through the connecting member 80 .
  • the end cap assembly 50 may also be provided with two electrode terminals 60 , and each electrode terminal 60 is electrically connected to the positive tab or the negative tab through a respective connecting member 80 .
  • two openings can also be provided on the same side of the housing 30 , and each opening cover is provided with an end cap assembly 50 .
  • the side of the end cap 70 facing the inside of the battery cell 20 is provided with a first matching portion 71
  • the connecting member 80 is provided with a second matching portion 81
  • the second matching portion 81 is configured to cooperate with the first matching portion 71 to provide connection Deformation resistance of the member 80 in the radial direction of the electrode extraction hole 72 .
  • the first matching portion 71 is provided on the side of the end cap 70 facing the inside of the battery cell 20 (that is, the side of the end cap 70 facing the connecting member 80 ), and the connecting member 80 is provided with the first matching portion 71 .
  • the second matching portion 81 is matched with the first matching portion 71 through the second matching portion 81, so that the end cover 70 and the connecting piece 80 can support each other at the position where the first matching portion 71 and the second matching portion 81 match.
  • the electrode terminal 60 is deformed due to collision, pulling, etc., causing the electrode terminal 60 to be dislocated, or even detached from the end cap 70, causing the battery cell 20 to leak liquid.
  • the first matching portion 71 and the second matching portion 81 are inserted in the axial direction along the electrode lead-out hole 72 .
  • the first matching portion 71 and the second matching portion 81 are inserted into each other, so that the first matching portion 71 and the second matching portion 81 are structurally nested with each other, so that the two can be connected in the radial direction along the electrode lead-out hole 72 .
  • the end cap 70 or the first matching portion 71 of the end cap 70 also needs to be produced together. deformation, which will undoubtedly increase the difficulty of deformation of the connecting piece 80 , thereby improving the structural strength between the end cap 70 and the connecting piece 80 and improving the deformation resistance of the connecting piece 80 .
  • one of the first matching portion 71 and the second matching portion 81 is a first connecting protrusion
  • the other is a first connecting hole
  • the first connecting protrusion is at least partially located in the corresponding first connecting hole
  • the first matching portion 71 is disposed on the outer periphery of the electrode lead-out hole 72 .
  • the first connection convex portion can play a role of positioning and support, which restricts the connection member 80 from moving along the electrode lead-out hole. 72 further moves or deforms in the radial direction.
  • the end cover 70 is installed and matched with the connecting piece 80, the first connecting protrusion can be directly inserted into the first connecting hole. This way is convenient for the positioning and installation of the end cover 70 and the connecting piece 80. , the assembly is convenient, and it is beneficial to improve the assembly efficiency.
  • the first connecting convex portion may be cylindrical, prismatic or other convex structures, and correspondingly, the first connecting hole may be a circular hole, a polygonal hole or a hole of other shapes. Wherein, the first connection hole may be a blind hole or a through hole.
  • the first matching portion 71 and the second matching portion 81 are both first connecting protrusions, and in the radial direction of the electrode lead-out hole 72 , the first matching portion 71 faces away from the electrode lead-out hole 72 .
  • a side wall of the second matching portion 81 abuts against a side wall of the second matching portion 81 facing the electrode lead-out hole 72 , so as to provide an anti-deformation force of the connector 80 along the radial direction of the electrode lead-out hole 72 .
  • the end cap 70 is provided with a plurality of first matching portions 71 , and the plurality of first matching portions 71 are evenly distributed along the circumferential direction of the electrode lead-out hole 72 .
  • the plurality of first matching portions 71 are formed into It is arranged on the end cover 70 in a circular array, and the center of the circular array is arranged coaxially with the axis of the electrode lead-out hole 72 .
  • the connecting member 80 is provided with a plurality of second matching portions 81 , and the second matching portions 81 are provided in a one-to-one correspondence with the first matching portions 71 .
  • first matching portions 71 evenly distributed along the circumference of the electrode lead-out hole 72 on the end cover 70 , after each first matching portion 71 is matched with each corresponding second matching portion 81 , the reinforcement is strengthened.
  • the structural strength of the connecting piece 80 at each position in the circumferential direction of the electrode lead-out hole 72 improves the overall radial deformation resistance of the connecting piece 80 .
  • the first matching portion 71 is a first connecting convex portion, and the projection of the first connecting convex portion along the axial direction of the electrode lead-out hole 72 at least partially overlaps with the electrode terminal 60 . That is, the projection of the first connecting protrusion along the axial direction of the electrode lead-out hole 72 overlaps with the portion of the electrode terminal 60 that is covered outside the electrode lead-out hole 72 , so that the overlapped portion of the electrode terminal 60 and the projection overlaps the end cap 70 .
  • the position of the first connection convex portion plays a supporting role, which increases the structural strength of the support portion of the end cap 70 , reduces the possibility of deformation of the end cap 70 at the position where the first matching portion 71 is provided, and is beneficial to improve the electrode terminal 60 at the same time. Tightness of connection to end cap 70.
  • the first matching portion 71 may also be a first connection hole, and the projection of the first connection hole along the axial direction of the first connection hole at least partially overlaps with the electrode terminal 60.
  • the end cap assembly 50 further includes a first insulating member 90, the first insulating member 90 is disposed between the end cap 70 and the connecting member 80, and the first insulating member 90 is used for insulating and isolating the end cap 70 and the connecting member 80.
  • the first insulating member 90 is provided with an insulating portion 91, and the insulating portion 91 has an accommodating cavity for accommodating the first matching portion 71 and/or the second matching portion 82, so as to isolate the end cap 70 from the connecting member 80 and avoid connection
  • the first matching portion 71 and/or the second matching portion 81 are in contact and conduct between the component 80 and the end cover 70 .
  • the first matching portion 71 is a first connecting convex portion
  • the second matching portion 81 is a first connecting hole
  • the insulating portion 91 protrudes toward the direction of the first connecting hole and is located at the first connecting hole.
  • the insulating part 91 is formed with a receiving cavity for wrapping the first connecting convex part on the side close to the first connecting convex part, and the first connecting convex part is located in the receiving cavity, so that the insulating part 91 will wrap the first connecting convex part.
  • the end cap 70 is insulated from the connecting member 80 and is located in the first connecting hole together with the first connecting convex portion.
  • the first matching portion 71 may also be a first connecting hole
  • the second matching portion 81 is a first connecting convex portion.
  • the first matching portion 71 and the second matching portion 81 may also be both first connecting protrusions, and the insulating portion 91 is provided with a side for accommodating the first matching portion 71 on the side facing the first matching portion 71 .
  • the insulating part 91 is formed with a second accommodating cavity for accommodating the second matching part 81 on the side facing the second matching part 81, so that the insulating part 91 can accommodate the first matching part 71 and the second matching part 81 respectively.
  • the two matching portions 81 are isolated to prevent the connection between the connector 80 and the end cover 70 from being in contact and conducting through the first matching portion 71 and the second matching portion 81 .
  • the first matching portion 71 is a first connecting protrusion
  • the second matching portion 81 is a first connecting hole
  • the side of the end cover 70 facing the first insulating member 90 is provided with a limiting protrusion 73 for limiting
  • the positioning protrusions 73 are provided around the outer periphery of the electrode lead-out holes 72
  • the first connecting protrusions are provided on the limiting protrusions 73 .
  • the side of the first insulating member 90 facing the end cover 70 is provided with a first groove 92 that is matched with the limiting protrusion 73
  • the bottom of the first groove 92 is provided with a first through hole that communicates with the electrode lead-out hole 72 .
  • the hole 93 and the insulating portion 91 are disposed on the other side of the first insulating member 90 away from the first groove 92 , and the accommodating cavity communicates with the first groove 92 .
  • the limiting protrusion 73 cooperates with the first groove 92 to limit the movement of the end cover 70 relative to the first insulating portion along the radial direction of the electrode lead-out hole 72, thereby improving the reliability of the connection between the end cover 70 and the first insulating member 90. Easy to locate and install.
  • the end cap assembly 50 further includes a second insulating member 100 , the second insulating member 100 is disposed between the electrode terminal 60 and the end cap 70 , and the second insulating member 100 is used for isolating the electrode terminal 60 and the end cap 70 .
  • the side of the end cap 70 facing the electrode terminal 60 is provided with a second groove 74 , the second groove 74 is disposed around the outer periphery of the electrode lead-out hole 72 , and the second groove 74 is connected to the second insulating member.
  • the second insulating member 100 is arranged in the second groove 74, the side of the second insulating member 100 facing the electrode terminal 60 is provided with a receiving portion, and the bottom of the receiving portion is provided with a second connecting portion connected to the electrode lead-out hole 72.
  • the through hole 110 and the electrode terminal 60 are at least partially located in the receiving portion, so that the first insulating member 90 insulates the electrode terminal 60 from the end cover 70 and makes the electrode terminal 60 at least partially located in the second groove 74 of the end cover 70 .
  • the second groove 74 can limit the movement of the electrode terminal 60 relative to the end cap 70 in the radial direction of the electrode lead-out hole 72 .
  • the end cap assembly 50 further includes a sealing member 200 disposed between the electrode terminal 60 and the end cap 70 for sealing the connection gap between the electrode terminal 60 and the end cap 70 .
  • the sealing member 200 is provided with a third through hole 210 that communicates with the electrode lead-out hole 72 , the side of the sealing member 200 facing the end cap 70 is provided with a third groove 220 , and the third groove 220
  • the inner peripheral wall of the electrode lead-out hole 72 extends along the axial direction of the electrode lead-out hole 72 toward the side close to the electrode terminal 60 with abutting portion 75 , and the abutting portion 75 is disposed in the third groove 220, the sealing member 200 is located between the side of the electrode terminal 60 with the third matching portion 61 and the first abutting portion 75, so that the side of the electrode terminal 60 with the third matching portion 61 and the abutting portion 75
  • the sealing effect is achieved by pressing the sealing element 200 .
  • the electrode terminal 60 is provided with a third matching portion 61
  • the connecting member 80 is provided with a fourth matching portion 82 matched with the third matching portion 61
  • the fourth matching portion 82 is in the third matching portion 61 .
  • At least one of the electrodes extends into the electrode lead-out hole 72 and is fixedly connected to the other.
  • the electrode terminal 60 and the connecting member 80 are fixedly connected by the third matching portion 61 and the fourth matching portion 82, such as laser welding and ultrasonic welding, so that the electrode terminal 60 is not easily connected to the connecting member 80 along the axial direction of the electrode lead-out hole 72. break away.
  • the fourth matching portion 82 is disposed on the connecting member 80 in an area enclosed by the plurality of second matching portions 81 , so that the connecting member 80 and the electrode terminal 60 pass through the fourth matching portion 82 and the third matching portion 81 .
  • the matching portion 61 is fitted and fixed, and the connecting piece 80 and the end cover 70 are fitted and connected with the first matching portion 71 through the second matching portion 81 , so that the electrode terminal 60 , the end cover 70 and the connecting piece 80 interact with each other, increasing the coordination of the three.
  • the overall structural strength of the resulting assembly improves the overall structural strength of the end cap assembly 50 and at the same time improves the deformation resistance of the connector 80 .
  • the third fitting portion 61 and the fourth fitting portion 82 are inserted and fitted along the axial direction of the electrode lead-out hole 72 .
  • the third matching portion 61 and the fourth matching portion 82 are inserted into each other, so that the third matching portion 61 and the fourth matching portion 82 are structurally nested with each other, so that the electrode terminal 60 and the connecting piece 80 can be inserted along the
  • the movement or deformation in the radial direction of the electrode lead-out hole 72 can play a role in mutual restraint.
  • the movement or deformation in the direction will also have the effect of mutual restraint, so that the deformation or movement of the electrode terminal 60, the end cap 70 and the connecting piece 80 will restrain each other, and the stability of the overall structure will become better.
  • the electrode terminal 60 is pulled by the bus member, it is more difficult for the electrode terminal 60 and the end cap 70 to be displaced from the end cap 70 in the radial direction of the electrode lead-out hole 72 .
  • the third matching portion 61 includes a second connecting protrusion
  • the fourth matching portion 82 includes a second connecting hole 821
  • the second connecting protrusion is fixed in the second connecting hole 821 .
  • the second connection hole 821 is a through hole, in this way, when the two are connected by welding, the upper surface of the fourth matching portion 82 and the lower surface of the third matching portion 61 are directly fixed by welding, which can be more intuitive. The quality of the welding can be seen, which can better ensure the reliability of the connection between the electrode terminal 60 and the connector 80 .
  • the fourth matching portion 82 further includes a third connecting convex portion 822 , the third connecting convex portion 822 extends along the axial direction of the electrode lead-out hole 72 to the side close to the end cap 70 , and the second connecting hole 821 It is arranged on the third connecting protrusion 822 .
  • the fourth matching portion 82 of the connecting member 80 is arranged to extend along the side of the electrode lead-out hole 72 axially close to the end cap 70 , thereby increasing the thickness of the third connection convex portion 822 along the axial direction of the electrode lead-out hole 72 , while the second The connection hole 821 is arranged on the third connection protrusion 822, which increases the depth of the second connection hole 821 in the axial direction, further increases the contact area of the second connection protrusion in the second connection hole 821, and improves the contact between the electrode terminal 60 and the electrode terminal 60.
  • the reliability of the connection of the connector 80 is improved, and the structural strength of the connector 80 is improved at the same time.
  • the second connection hole 821 may be a through hole or a blind hole.
  • the second connection hole 821 may be a through hole.
  • FIG. 9 is a schematic cross-sectional structure diagram of the end cap assembly 50 along the A-A direction in another embodiment of the present application.
  • the connecting member 80 is recessed in the direction away from the electrode lead-out hole 72 to form The above-mentioned third connecting protrusion 822, and the inner peripheral wall of the second connecting hole 821 extends along the axial direction of the second connecting hole 821 away from the end cover 70 to form a flange 823, the flange 823 and the second connecting protrusion contact with the peripheral wall.
  • the third connection protrusion 822 is a protrusion structure formed by the side of the connector 80 facing away from the electrode lead-out hole 72 toward another depression of the electrode lead-out hole 72 , so that the inside of the third connection protrusion 822 is formed
  • the third connecting convex portion 822 and the flange 823 can be formed by stamping, which is simple in structure and convenient in processing.
  • the third connection protrusion 822 is at least partially accommodated in the electrode lead-out hole 72 .
  • the space in the electrode extraction holes 72 is utilized, and the space occupied by the third connection protrusions 822 in the connector 80 inside the battery cell 20 can be reduced, thereby improving the The energy density of the battery cell 20 .
  • the connecting member 80 further includes at least two reinforcing blocks 83 , and the reinforcing blocks 83 and the second matching portion 81 are alternately arranged along the circumference of the electrode lead-out hole 72 , that is, the reinforcing blocks 83 and the second matching portion 81 are alternately arranged.
  • the connecting member 80 is alternately arranged around the outer circumference of the fourth matching portion 82 .
  • FIG. 10 is a schematic structural diagram of the connector 80 in an unfolded state according to an embodiment of the application.
  • the reinforcing block 83 includes radial reinforcing ribs 831 and/or circumferential reinforcing ribs 831 .
  • Stiffener 832 refers to a rib that is provided on the connector 80 and whose length direction extends along the radial direction of the electrode lead-out hole 72 ;
  • the circumferential reinforcing rib 832 refers to a rib that is provided on the connector 80 and A rib whose longitudinal direction extends along the circumferential direction of the electrode extraction hole 72 . Regardless of whether it is the radial reinforcing rib 831 or the circumferential reinforcing rib 832, the structural strength of the connecting piece 80 can be improved, and the deformation resistance capability thereof can be improved.
  • the reinforcing block 83 includes a radial reinforcing rib 831 and a circumferential reinforcing rib 832 , and the radial reinforcing rib 831 and the circumferential reinforcing rib 832 are arranged intersecting.
  • the radial reinforcement rib 831 and/or the circumferential reinforcement rib 832 have an arched cross-section in the length direction, and the arched cross-section can improve the deformation resistance of the connecting reinforcing rib, thereby improving the strength of the connector 80 . Deformation resistance.
  • the cross-sectional shape of the radial reinforcing rib 831 and/or the circumferential reinforcing rib 832 along the length direction thereof may also be other shapes, such as a rectangle, but not limited thereto.
  • Embodiments of the present application further provide a method for preparing a battery cell 20, wherein for the parts not described in detail, reference may be made to the foregoing embodiments.
  • the connecting member 80 includes at least two non-bending parts and a bending part 84 connected between two adjacent non-bending parts.
  • the connecting member 80 can be in an unfolded state during assembly, which is convenient for the connecting member 80 to be connected with the electrode terminal 60 and the tab.
  • the connecting member 80 can be bent into a laminated structure in the casing 30 , thereby reducing the space occupied by the connecting member 80 inside the battery cell 20 and improving the energy density of the battery cell 20 .
  • the at least two non-bending parts include a first non-bending part 85 , a second non-bending part 86 and a third non-bending part 87 , wherein the second non-bending part 86 is located at the first non-bending part 85 and the third non-bending part 87 , the first non-bending part 85 is connected to the electrode terminal 60 , and the third non-bending part 87 is connected to the tab of the electrode assembly 40 .
  • the connector 80 can be connected by welding, such as laser welding, ultrasonic welding, etc. When the connector 80 is connected to the electrode terminal 60, it is only necessary to weld the first non-bending portion 85 to the electrode terminal 60, and the connector 80 to the electrode terminal 60. When the ears are connected, only the third non-bending portion 87 needs to be welded to the tabs, and the entire connector 80 does not need to be welded, which greatly reduces the difficulty of welding the connector 80 to the electrode terminals 60 and the tabs.
  • the second matching portion 81 , the fourth matching portion 82 , and the reinforcing block 83 in the foregoing embodiments are respectively disposed on the first non-bending portion 85 of the connecting member 80 .
  • the end cap assembly 50 , the battery cell 20 , the battery 10 and the electrical device according to the embodiment of the present application are described above.
  • the method for preparing the battery cell 20 according to the embodiment of the present application will be described below.
  • the present application further provides a method 300 for preparing a battery cell 20 , as shown in FIGS. 3 to 11 , and FIG. 11 is a schematic flowchart of the method 300 for preparing a battery cell according to an embodiment of the present application.
  • the method 300 for preparing the battery cell 20 includes the following steps:
  • the end cap assembly 50 includes: an end cap 70, the end cap 70 is provided with an electrode lead-out hole 72, the end cap 70 is provided with a first matching portion 71 on the side facing the inside of the battery cell 20; an electrode terminal 60, the electrode terminal 60 is arranged on the end cap 70, and covers the electrode lead-out hole 72;
  • the matching portion 81, the second matching portion 81 is configured to cooperate with the first matching portion 71, so as to provide an anti-deformation force of the connecting member 80 along the radial direction of the electrode lead-out hole 72;
  • Electrode assembly 40 the electrode assembly 40 includes a main body portion and a tab;
  • the electrode assembly 40 is accommodated in the casing 30 , the connector 80 connects the tabs and the electrode terminals 60 , and the end cap assembly 50 covers the opening, so as to enclose the electrode assembly 40 in the casing 30 .
  • the first matching portion 71 and the second matching portion 81 cooperate with each other, so that the end cover 70 and the connecting member 80 can support each other at the position where the first matching portion 71 and the second matching portion 80 are matched.
  • the structural strength of the connecting member 80 is improved, so that the deformation resistance of the connecting member 80 in the radial direction becomes stronger, thereby solving the problem that the connecting member 80 is deformed and detached from the electrode terminal 60 due to low structural strength.

Abstract

本申请公开了一种端盖组件、电池单体、电池、用电装置及制备方法，端盖组件包括：端盖，所述端盖设有电极引出孔，所述端盖朝向所述电池单体内部的一侧设有第一配合部；电极端子，所述电极端子设置于所述端盖，并覆盖所述电极引出孔；以及连接件，所述连接件用于电连接所述电极端子和所述电池单体的电极组件，所述连接件设有第二配合部，所述第二配合部被配置为与所述第一配合部配合，以提供所述连接件沿所述电极引出孔径向的抗变形力。本申请实施例实现提高连接件的结构强度，解决连接件容易发生形变导致电极端子错位或与端盖脱离，使电池单体产生漏液的问题。

Description

端盖组件、电池单体、电池、用电装置及制备方法 技术领域
本申请涉及电池领域，具体涉及一种端盖组件、电池单体、电池、用电装置及制备方法。
背景技术
随着电池技术的不断发展，对电池的性能提出了更高的要求，希望电池能够同时考虑多方面的设计因素。而电池的长寿命是本领域技术人员一直追求的目标，但是在现有技术中，时常发现电池单体在电极端子处发生电解液泄露，造成电池发生报废，影响电池的寿命。
发明内容
本申请提出一种端盖组件、电池单体、电池、用电装置及制备方法，以期提高连接件的结构强度，解决连接件容易发生变形导致与连接件连接的电极端子发生错位，而使电池单体产生漏液问题。
根据本申请的第一方面，提供了一种端盖组件，用于电池单体，包括：端盖，所述端盖设有电极引出孔，所述端盖朝向所述电池单体内部的一侧设有第一配合部；电极端子，所述电极端子设置于所述端盖，并覆盖所述电极引出孔；以及连接件，所述连接件用于电连接所述电极端子和所述电池单体的电极组件，所述连接件设有第二配合部，所述第二配合部被配置为与所述第一配合部配合，以提供所述连接件沿所述电极引出孔径向的抗变形力。
本实施例中的端盖组件通过第一配合部和第二配合部相互配合，使得端盖与连接件在第一配合部和第二配合相配合的位置可以起到相互支撑的作用，提高了连接件的结构强度，使得连接件在沿径向方向的抗变形能力变强，从而解决连接件因结构强度低，容易发生形变导致与连接件连接的电极端子发生错位甚至与端盖脱离，使电池单体产生漏液的问题。
在一些实施例中，所述第一配合部与所述第二配合部沿所述电极引出孔的轴向插接配合。
通过插接配合的方式，第一配合部和第二配合部在结构上相互嵌套，使两者在沿着电极引出孔的径向方向可以相互作用，增加连接件沿径向方向发生变形的难度，提高了端盖与连接件之间的结构强度，提高连接件的抗变形能力。
在一些实施例中，所述第一配合部和所述第二配合部中的其中一者为第一连接凸部，另一者为第一连接孔，所述第一连接凸部至少部分位于对应的所述第一连接孔内，并且所述第一配合部设置于所述电极引出孔的外周。
第一配合部位于电极引出孔的外周，位于第一连接孔内的第一连接凸部的部分会限制连接件沿电极引出孔的径向方向进一步发生形变，同时，第一连接凸部和第一连接孔的这种结构，便于端盖与连接件的定位安装，装配方便，有利于提高装配效率。
在一些实施例中，所述端盖设有多个所述第一配合部，多个所述第一配合部沿着所述电极引出孔的周向均匀分布；所述连接件设有多个所述第二配合部，所述第二配合部与所述第一配合部对应设置。
多个第一配合部沿着电极引出孔的周向均匀分布，使得各个第一配合部和对应的第二配合部配合后，提高连接件的电极引出孔的周向各个位置的结构强度，提高连接件整体的径向抗变形能力。
在一些实施例中，所述第一配合部为第一连接凸部，所述第一连接凸部沿着轴向的投影与所述电极端子至少部分重叠。
电极端子与第一连接凸部在轴向方向的投影重叠的部分，会对端盖起到支撑作用，增加端盖支撑部位的结构强度，减小端盖在设有第一配合部处变形的可能性，同时有利于提高电极端子与端盖的密封性。
在一些实施例中，所述端盖组件还包括第一绝缘件，所述第一绝缘件设置于所述端盖与所述连接件之间，所述第一绝缘件设有绝缘部，所述绝缘部具有容纳腔，所述容纳腔用于容纳所述第一配合部和/或所述第二配合部，以隔离所述端盖和所述连接件。
通过端盖与连接件之间设置第一绝缘件，第一绝缘件通过设置具有容 纳腔的绝缘部，以包裹第一配合部和/或第二配合部，以免端盖与连接件之间通过第一配合部和/或第二配合部接触导通，从而使端盖与连接件绝缘。
在一些实施例中，所述电极端子设有第三配合部，所述连接件上设有与所述第三配合部相配合的第四配合部，所述第四配合部与所述第三配合部中的至少一者伸入所述电极引出孔与另一者固定连接。
在一些实施例中，所述第三配合部与所述第四配合部沿所述电极引出孔的轴向插接配合。
通过插接配合的方式，电极端子和连接件在沿着电极引出孔的径向方向上的移动或变形可以起到相互制约作用，由于第一配合部和第二配合部配合后，连接件与端盖在沿电极引出孔的径向方向的移动或变形也会有相互制约的作用，使得电极端子、端盖和连接件之间对彼此之间的变形或移动会相互牵制，整体结构的稳定性会变好，当汇流部件拉扯电极端子时，电极端子与端盖在沿电极引出孔的径向方向上发生与端盖发生错位的难度增加。
在一些实施例中，所述第三配合部包括第二连接凸部，所述第四配合部包括第二连接孔，所述第二连接凸部固定于所述第二连接孔内。
该种方式，可以方便电极端子与转接件的定位和安装。
在一些实施例中，所述第四配合部还包括第三连接凸部，所述第三连接凸部沿着所述电极引出孔的轴向向靠近所述端盖的一侧延伸，所述第二连接孔设置于所述第三连接凸部上。
第三连接凸部沿电极引出孔的轴向向靠近端盖的一侧延伸，使第三连接凸部沿电极引出孔的轴向的厚度增加，而第二连接孔设置于第三连接凸部上，增加了第二连接孔沿其轴向方向深度，增加了第二连接凸部在第二连接孔内与连接件的接触面积，有利于提高电极端子和连接件连接的可靠性。
在一些实施例中，所述连接件背离所述电极引出孔的一侧向靠近所述电极引出孔的方向凹陷以形成所述第三连接凸部，并且所述第二连接孔的内周壁沿着所述第二连接孔的轴向方向向远离所述端盖的方向延伸形成凸缘，所述凸缘与所述第三连接凸部的外周壁接触。
第三连接凸部是由连接件背离电极引出孔的一侧向靠近电极引出孔的 另一侧凹陷所形成的凸起结构，使得第三连接凸部的内部会形成有空腔，减少了第三连接凸起的重量，其中，第二连接孔的内周壁沿着自身的轴向向远离端盖的方向沿伸形成凸缘，增加第二连接孔内周壁与第三连接凸部之间的接触面积，从而保证连接结构强度，同时降低了端盖组件的重量，提高了电池单体的能量密度。
在一些实施例中，所述第三连接凸部至少部分容纳于所述电极引出孔内。
通过将第三连接凸部收容于电极引出孔内，可以减少连接件中第三连接凸部在电池单体内部占用的空间，以提高电池单体的能量密度。
在一些实施例中，所述连接件还包括至少两个加强块，所述加强块与所述第二配合部沿着所述电极引出孔的周向交替设置。
通过设置加强块，可以进一步增加连接件的结构强度。
根据本申请的第二方面，提供了一种电池单体，包括：壳体，所述壳体具有开口；电极组件，所述电极组件收容于所述壳体内，所述电极组件包括主体部和极耳；以及根据第一方面实施例所述的端盖组件，所述端盖覆盖所述壳体的开口，以将所述电极组件封闭在所述壳体内，所述连接件连接所述极耳和所述电极端子。
根据本申请的第三方面，提供了一种电池，其包括上述实施例中的电池单体。
根据本申请的第四方面，提供了一种用电装置，其包括上述实施例中的电池单体，所述电池单体用于供电。
根据本申请的第五方面，提供了一种制备电池单体的方法，包括：提供端盖组件，所述端盖组件包括：端盖，所述端盖设有电极引出孔，所述端盖朝向所述电池单体内部的一侧设有第一配合部；电极端子，所述电极端子设置于所述端盖，并覆盖所述电极引出孔；以及连接件，所述连接件用于电连接所述电极端子和所述电池单体的电极组件，所述连接件设有第二配合部，所述第二配合部被配置为与所述第一配合部配合，以提供所述连接件沿所述电极引出孔径向的抗变形力；提供电极组件，所述电极组件包括主体部和极耳；提供壳体，所述壳体设有开口；将所述电极组件收容于所述壳体内，所述连接件连接所述极耳和所述电极端子，所述端盖组件 覆盖所述开口，以将所述电极组件封闭于所述壳体内。
通过第一配合部和第二配合部相互配合，使得端盖与连接件在第一配合部和第二配合相配合的位置可以起到相互支撑的作用，提高了连接件的结构强度，使得连接件在沿径向方向的抗变形能力变强，从而解决连接件因结构强度低，容易发生形变导致与连接件连接的电极端子发生错位甚至与端盖脱离，使电池单体产生漏液的问题。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中，附图未必按照实际的比例绘制：
图1为本申请实施例车辆的结构示意图；
图2位本申请实施例电池的分解结构示意图；
图3为本申请实施例电池单体的结构示意图；
图4为本申请实施例电池单体的分解结构示意图；
图5为本申请实施例端盖组件的结构示意图；
图6为本申请实施例端盖组件的一视角的分解结构示意图(连接件处于未折叠状态)；
图7为本申请实施例端盖组件的另一视角的分解结构示意图(连接件处于折叠状态)；
图8为本申请一实施例中端盖组件沿A-A方向的剖面结构示意图；
图9为本申请另一实施例中端盖组件沿A-A方向的剖面结构示意图；
图10为本申请一实施例中连接件处于未折叠状态的结构示意图；
图11为本申请实施例电池单体制备方法的示意性流程图。
图中的各附图标记：
1、车辆；1a、马达；1b、控制器；
10、电池；11、第一部分；12、第二部分；13、电池模块；
20、电池单体；
30、壳体；
40、电极组件；
50、端盖组件；
60、电极端子；61、第三配合部；
70、端盖；71、第一配合部；72、电极引出孔；73、限位凸部；74、第二凹槽；75、抵接部；
80、连接件；81、第二配合部；82、第四配合部；83、加强块；84、弯折部；85、第一非弯折部；86、第二非弯折部；87、第三非弯折部；821、第二连接孔；822、第三连接凸部；823、凸缘；831、径向加强筋；832、周向加强筋；
90、第一绝缘件；91、绝缘部；92、第一凹槽；93、第一通孔；
100、第二绝缘件；110、第二通孔；
200、密封件；210、第三通孔；220、第三凹槽。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本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；本文中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本文中提及“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。
本文中术语“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。
本申请中出现的“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)。
发明人注意到电池在使用过程中，由于不可避免地会发生振动、磕碰等问题，比如车辆地面行驶时，车身的振动会传递给电池，使安装于电池内部的电池单体与电池单体之间也会碰撞、拉扯等问题，导致电池端盖组中的连接件容易发生变形，而其中主要的原因在于连接件的厚度较薄、结构强度小，容易发生变形造成。
发明人发现，连接件与电极端子通过焊接固定，使端盖直接固定在电极端子和连接件之间，由于连接件的厚度比较薄，结构强度小，在焊接固定后，一旦电池单体受到冲击，电池单体之间会发生相对移动，拉扯汇流部件，对电极端子产生力的作用，电极端子受到的力作用于连接件，使得连接件沿电极引出孔的径向发生弯曲变形，连接件变形后对电极端子的定位受到影响，使得电极端子容易发生错位甚至与端盖脱离，造成漏液，使电池单体无法正常使用，影响电池的寿命。
因此，为了解决连接件变形造成电极端子发生错位的问题，发明人从提高连接件的抗变形能力，增强连接件的结构强度出发，对连接件的结构以及连接件与电极端子和端盖的连接结构进行了设计，发现在连接件和端盖上通过设置相互配合的结构，可以有效地提高连接件的结构强度和抗变形能力，在连接件与连接端子通过进一步设置相互配合的结构，也可以进一步提高的连接件的结构强度和抗变形能力，提高端盖组件的整体结构强度的抗变形能力，使得电池单体的密封性能得到提高，进一步地，提高了电池单体的使用寿命。
本申请实施例提供一种使用电池作为电源的用电装置，用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具 等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
为了便于描述，以车辆1作为示例，如图1所示，图1为本申请实施例车辆1的结构示意图，车辆1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1包括马达1a、控制器1b和电池10，控制器1b可用于控制器1b电池10为马达1a供电，马达1a通过传动机构与车轮连接，以驱动车辆1移动。
电池10可以设置于车辆1的内部，例如，车辆1的头部、尾部或底部。电池10可以为电池包，也可以为电池模块。
作为示例的，电池10可以作为车辆1的操作电源，用于所述车辆1的电路系统。又或者，电池10用于车辆1的启动、导航和运行时的工作用电需求。
在本申请的另一实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，替代或部分地替代燃油或天然气为车辆1提供驱动动力。
如图2所示，图2为本申请实施例电池10的分解结构示意图，在一些实施例中，为了满足不同的使用电力需求，电池10可以包括一个或者多个电池模块13(或者也可以称为电池模组)，其中，多个电池模块13之间可以通过串联或并联或混联连接，混联是指串联和并联的混合。
除此之外，电池10还可以包括其他结构，例如，电池10包括箱体，箱体包括第一部分11和第二部分12，第一部分11和第二部分12盖合并形成有容纳部，多个电池模块13设置于箱体内。但本申请实施例并不限于此。
如图2至图4所示，图3为本申请实施例电池单体20的结构示意图，图4为本申请实施例电池单体20的分解结构示意图。在如图所示的实施例中，根据不同的电力需求，电池10可以包括一个或多个电池单体20，例如，一个电池10可以包括多个电池单体20，多个电池单体20可通过串联、并联或混联的方式连接以实现较大的容量或功率。一个电池10中包括电池单体20的数量可以设置为任意数值。其中，电池10可以直接由多个电池单体20通过串联、并联或混联连接组成；也可以是多个电池单体20通过串联、并联或混联组成电池模块13，然后再由多个电池模块13通过串联、 并联或混联连接组成电池10。电池10还可以包括其他结构，例如，该电池10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可以包括为锂离子二次电池、锂离子一次电池、锂硫电池、钠锂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。本申请以电池单体20呈圆柱体为例进行说明。
如图3至图4所示，本申请实施例中的电池单体20包括壳体30、电极组件40和端盖组件50。壳体30具有开口，壳体30内具有用于容纳电极组件40和电解液的内部空间，内部空间与开口相连通，其中，壳体30可以采用铝、铝合金或塑料等材质制成，壳体30的形状可以为圆柱形、长方体形或者其它形状。端盖组件50覆盖壳体30的开口，以将电极组件40封闭在壳体30的内部。
电极组件40可以通过将正极片、负极片和隔膜一同堆叠或卷绕而成，其中，隔膜是位于正极片或负极片之间的绝缘体。正极片和负极片均包括涂覆区和未涂覆区，其中，正极活性物质被涂覆在正极片的涂覆区上，负极活性物质被涂覆在负极片的涂覆区上，活性物质被涂覆在由金属薄板形成的集流体上，在未涂覆区上没有涂覆活性物质。
电极组件40包括主体部和极耳，极耳分为正极耳和负极耳。主体部具有相对设置的两个端部，正极耳和负极耳分别于设置于电极组件40的第一方向(图3和图4中所示的x轴方向)的两端，可以理解的是，第一方向可以是电极组件40的长度方向。其中，正极片的未涂覆区层叠形成正极耳，负极片的未涂覆区层叠形成负极耳。
如图3至图8所示，其中，图5为本申请实施例端盖组件50的结构示意图，图6为本申请实施例端盖组件50的一视角的分解结构示意图(连接件处于未折叠状态)，图7为本申请实施例端盖组件50的另一视角的分解结构示意图(连接件处于折叠状态)，图8为本申请一实施例中端盖组件50沿A-A方向的剖面结构示意图。
端盖组件50包括端盖70、电极端子60和连接件80。端盖70与壳体30密封连接，也即端盖70密封盖设于壳体30的开口处。端盖70设有电极引出孔72，电极端子60设置于端盖70上，并且电极端子60覆盖电极 引出孔72，以密封电极引出孔72。电极端子60通过连接件80与电极组件40的极耳电连接，以保证电极端子60和电极组件40正常的电流导通。电极组件40的第一方向的两端中的每一端对应设置有一个端盖组件50，其中，与正极耳对应的端盖组件50，其电极端子60通过连接件80与正极耳电连接，与负极耳对应的端盖组件50，其电极端子60通过连接件80与负极耳电连接。可以理解的是，端盖组件50也可以设有两个电极端子60，并且每一电极端子60分别通过各自的连接件80与正极耳或负极耳电连接。当然，壳体30的同一侧也可以设置两个开口，每一个开口盖设有一个端盖组件50。
端盖70面向电池单体20内部的一侧设有第一配合部71，连接件80设有第二配合部81，第二配合部81被配置为与第一配合部71配合，以提供连接件80沿电极引出孔72的径向方向的抗变形力。
本申请实施例中的端盖组件50，通过在端盖70面向电池单体20内部的一侧(即端盖70面向连接件80的一侧)设置第一配合部71，连接件80设置第二配合部81，通过第二配合部81与第一配合部71相配合，使得端盖70与连接件80在第一配合部71和第二配合部81相配合的位置可以起到相互支撑的作用，提高了连接件80的结构强度，从而提高了连接件80在沿电极引出孔72的径向方向的抗变形能力，可以有效解决连接件80因结构强度低容易因电池单体20之间的碰撞、拉扯等原因发生变形，导致电极端子60发生错位，甚至与端盖70脱离，使电池单体20发生漏液的问题。
在一些实施例中，如图6至图8所示，第一配合部71和第二配合部81之间沿着电极引出孔72的轴向插接配合。第一配合部71和第二配合部81通过插接配合，使得第一配合部71和第二配合部81在结构上相互嵌套，使两者在沿着电极引出孔72的径向方向可以相互作用，比如，当连接件80的沿着电极引出孔72的径向发生变形时，此时如果需要进一步发生变形，则需要使端盖70或者端盖70的第一配合部71也一同发生变形，而这无疑会增加连接件80发生变形的难度，从而提高的端盖70与连接件80之间的结构强度，提高连接件80的抗变形能力。
具体地，第一配合部71和第二配合部81中的其中一者为第一连接凸部，另一者为第一连接孔，第一连接凸部至少部分位于对应的第一连接孔 内，并且第一配合部71设置于电极引出孔72的外周。
由于第一配合部71位于电极引出孔72的外周，第一连接凸部位于第一连接孔内的部分，第一连接凸部可以起到定位支撑的作用，限制了连接件80沿电极引出孔72的径向进一步发生移动或变形，端盖70与连接件80安装配合时，第一连接凸部可以直接插入第一连接孔内，该种方式，便于端盖70与连接件80的定位安装，装配方便，有利于提高装配效率。
作为示例的，第一连接凸部可以圆柱形、棱柱形或者其他凸起结构，对应的，第一连接孔可以圆孔、多边形孔或者其他形状的孔。其中，第一连接孔可以为盲孔，也可以为通孔。
在另一些实施例中，第一配合部71和第二配合部81均为第一连接凸部，并且在电极引出孔72的径向方向上，第一配合部71背离向电极引出孔72的一侧壁与第二配合部81朝向电极引出孔72的一侧壁相抵接，以提供连接件80沿电极引出孔72的径向方向的抗变形力。
在一些实施例中，端盖70设有多个第一配合部71，多个第一配合部71沿着电极引出孔72的周向均匀分布，作为示例的，多个第一配合部71成呈圆周阵列设置于端盖70上，并且所述圆周阵列的圆心与电极引出孔72的轴心同轴设置。连接件80设有多个第二配合部81，第二配合部81与第一配合部71一一对应设置。
本实施例中，通过在端盖70上设置多个沿电极引出孔72周向均匀分布的第一配合部71，使得各个第一配合部71与各个对应的第二配合部81配合后，加强连接件80在电极引出孔72的周向的各个位置的结构强度，提高了连接件80整体的径向抗变形能力。
在一些实施例中，第一配合部71为第一连接凸部，第一连接凸部沿着电极引出孔72的轴向的投影与电极端子60至少部分重叠。也即第一连接凸部沿电极引出孔72的轴向方向的投影与电极端子60覆盖于电极引出孔72外的部分重叠，使得电极端子60与所述投影重叠部分会对端盖70设有第一连接凸部的位置起到支撑的作用，增加端盖70支撑部位的结构强度，减少端盖70在设有第一配合部71的位置的变形的可能性，同时有利于提高电极端子60与端盖70连接的密封性。
可以理解的是，在另一些实施例中，第一配合部71也可以为第一连 接孔，并且第一连接孔沿着第一连接孔的轴向的投影与电极端子60至少部分重叠。
在一些实施例中，端盖组件50还包括第一绝缘件90，第一绝缘件90设置于端盖70与连接件80之间，第一绝缘件90用于绝缘隔离端盖70与连接件80。第一绝缘件90设有绝缘部91，绝缘部91具有容纳腔，容纳腔用于容纳第一配合部71和/或第二配合部82，以使端盖70与连接件80隔离，避免连接件80与端盖70之间通过第一配合部71和/或第二配合部81接触导通。
在一些可选的实施例中，第一配合部位71为第一连接凸部，第二配合部81为第一连接孔，绝缘部91朝向第一连接孔的方向凸出，并且位于第一连接孔内，绝缘部91在靠近第一连接凸部的一侧形成有用于包裹第一连接凸部的容纳腔，第一连接凸部位于容纳腔内，以使绝缘部91将包裹第一连接凸部并与第一连接凸部一同位于第一连接孔内，从而使端盖70与连接件80绝缘。可以理解的是，在另一些实施例中，第一配合部位71也可以为第一连接孔，第二配合部81为第一连接凸部。
在另一些实施例中，第一配合部71和第二配合部81也可以均为第一连接凸起，并且，绝缘部91朝向第一配合部71的一侧设有用于容纳所述第一配合部71的第一容纳腔，绝缘部91朝向第二配合部81的一侧形成有用于容纳第二配合部81的第二容纳腔，以使绝缘部91分别将第一配合部71和第二配合部81隔离，避免连接件80与端盖70之间通过第一配合部71和第二配合部81接触导通。
在一些实施例中，第一配合部71为第一连接凸部，第二配合部81为第一连接孔，端盖70的面向第一绝缘件90的一侧设有限位凸部73，限位凸部73环绕电极引出孔72的外周设置，第一连接凸部设置于限位凸部73上。第一绝缘件90面向端盖70的一侧设有与限位凸部73相适配的第一凹槽92，第一凹槽92的底部设有与电极引出孔72相连通的第一通孔93，绝缘部91设置于第一绝缘件90背离第一凹槽92的另一侧，并且容纳腔与第一凹槽92相连通。限位凸部73与第一凹槽92配合，以使限制端盖70相对第一绝缘部沿着电极引出孔72的径向移动，提高端盖70与第一绝缘件90连接的可靠性，方便定位安装。
在一些实施例中，端盖组件50还包括第二绝缘件100，第二绝缘件100设置于电极端子60和端盖70之间，第二绝缘件100用于隔离电极端子60和端盖70。
在一些具体的实施例中，端盖70面向电极端子60的一侧设有第二凹槽74，第二凹槽74环绕电极引出孔72的外周设置，第二凹槽74与第二绝缘件100相适配，第二绝缘件100设置于第二凹槽74内，第二绝缘件100面向电极端子60的一侧设有收容部，收容部的底部设有连通电极引出孔72的第二通孔110，电极端子60至少部分位于收容部内，以使第一绝缘件90将电极端子60与端盖70绝缘，并使电极端子60至少部分位于端盖70的第二凹槽74内。通过这种方式，第二凹槽74可以限制电极端子60相对端盖70沿电极引出孔72的径向移动。
在一些实施例中，端盖组件50还包括密封件200，密封件200设置于电极端子60和端盖70之间，用于密封电极端子60与端盖70之间连接间隙。
在一些具体的实施例中，密封件200设有与电极引出孔72相连通的第三通孔210，密封件200面向端盖70的一侧设有第三凹槽220，第三凹槽220环绕第三通孔210的外周设置，电极引出孔72的内周壁沿电极引出孔72的轴向向靠近电极端子60的一侧延伸有抵接部75，抵接部75设置于第三凹槽220内，密封件200位于电极端子60设有第三配合部61的一侧与第一抵接部75之间，以使电极端子60设有第三配合部61的一侧和抵接部75通过对密封件200的挤压作用实现密封的效果。
在一些实施例中，电极端子60设有第三配合部61，连接件80上设有与第三配合部61相配合的第四配合部82，第四配合部82与第三配合部61中的至少一者伸入电极引出孔72与另一者固定连接。
电极端子60和连接件80通过第三配合部61和第四配合部82的固定连接，比如激光焊接固定、超声波焊接固定，使得电极端子60不易沿着电极引出孔72的轴向与连接件80脱离。
在一些实施例中，第四配合部82设置于连接件80上在多个第二配合部81所围合的区域内，以使连接件80与电极端子60通过第四配合部82和第三配合部61配合固定，连接件80与端盖70通过第二配合部81与第 一配合部71配合连接，使得电极端子60、端盖70和连接件80之间相互作用，增加三者配合而成的整体的结构强度，提高了端盖组件50的整体结构强度，同时提高连接件80的抗变形能力。
在一些实施例中，第三配合部61和第四配合部82沿着电极引出孔72的轴向方向插接配合。第三配合部61和第四配合部82之间通过插接配合的方式，使得第三配合部61和第四配合部82在结构上相互嵌套，使电极端子60和连接件80在沿着电极引出孔72的径向方向上的移动或变形可以起到相互制约作用，由于第一配合部71和第二配合部81配合后，连接件80与端盖70在沿电极引出孔72的径向方向的移动或变形也会有相互制约的作用，使得电极端子60、端盖70和连接件80之间对彼此之间的变形或移动会相互牵制，整体结构的稳定性会变好，当汇流部件拉扯电极端子60时，电极端子60与端盖70在沿电极引出孔72的径向方向上发生与端盖70发生错位的难度增加。
具体地，在一些实施例中，第三配合部61包括第二连接凸部，第四配合部82包括第二连接孔821，第二连接凸部固定于第二连接孔821内。该种方式，可以方便电极端子60与转接件80的定位和安装。当第二连接孔821为通孔时，该种方式下两者通过焊接连接时，相对于第四配合部82的上表面与第三配合部61的下表面直接通过焊接固定方式，可以更直观的看出焊接的质量，能够更好的保证电极端子60与连接件80的连接可靠性。
在一些实施例中，第四配合部82还包括第三连接凸部822，第三连接凸部822沿着电极引出孔72的轴向向靠近端盖70的一侧延伸，第二连接孔821设置于第三连接凸部822上。
连接件80的第四配合部82通过设置沿电极引出孔72轴向靠近端盖70的一侧延伸，从而增加第三连接凸部822沿电极引出孔72的轴向方向的厚度，而第二连接孔821设置于第三连接凸部822上，增加了第二连接孔821其轴向方向的深度，进一步增加第二连接凸部在第二连接孔821内的接触面积，提高电极端子60与连接件80连接的可靠性，同时提高连接件80的结构强度。其中，第二连接孔821可以为通孔，也可以为盲孔，可选的，第二连接孔821为通孔。
如图6和图9所示，图9为本申请另一实施例中端盖组件50沿A-A 方向的剖面结构示意图，在一些实施例中，连接件80背离电极引出孔72的方向凹陷以形成上述的第三连接凸部822，并且第二连接孔821的内周壁沿着第二连接孔821的轴向向远离端盖70的方向延伸形成凸缘823，凸缘823与第二连接凸部的外周壁接触。
本实施例中，第三连接凸部822为连接件80背离电极引出孔72的一侧向靠近电极引出孔72的另一凹陷所形成的凸起结构，使得第三连接凸部822的内部形成有空腔，第二连接孔821的内周壁沿着自身的轴向向远离端盖70的方向延伸形成凸缘823，增加第二连接孔821内周壁与第二连接凸部之间的接触面积，从而保证连接结构的强度，同时第三连接凸部822是通过凹陷形成，降低了端盖组件50的重量，提高了电池单体20的能量密度。其中，第三连接凸部822和凸缘823可以通过冲压的方式成型，结构简单，加工方便。
在一些实施例中，第三连接凸部822至少部分容纳于电极引出孔72内。通过将第二连接凸部收容于电极引出孔72内，利用了电极引出孔72内的空间，可以减少连接件80中的第三连接凸部822在电池单体20内部的占用空间，从而提高电池单体20的能量密度。
在一些实施例中，连接件80还包括至少两个加强块83，加强块83与第二配合部81沿着电极引出孔72的周向交替设置，也即加强块83与第二配合部81在连接件80上环绕第四配合部82的外周交替设置。通过设置加强块83，可以进一步提高连接件80的结构强度，提高其抗变形能力。
在一些实施例中，请结合图6和图10所示，图10为本申请一实施例中连接件80处于未折叠状态的结构示意图，加强块83包括径向加强筋831和/或周向加强筋832。其中，径向加强筋831是指设置于连接件80上，并且其长度方向沿着电极引出孔72的径向方向延伸的肋板；周向加强筋832是指设置于连接件80上，并且其长度方向沿着电极引出孔72的周向方向延伸的肋板。不管是径向加强筋831还是周向加强筋832，均可以提高连接件80的结构强度，提高其抗变形能力。
作为优选的实施例，加强块83包括径向加强筋831和周向加强筋832，并且径向加强筋831与周向加强筋832交叉设置。
在一些实施例中，径向加强筋831和/或周向加强筋832在其长度方向 的截面为拱形，通过呈拱形的截面，提高连接加强筋抗变形能力，从而提高连接件80的抗变形能力。
可以理解的是，在另一些实施例中，径向加强筋831和/或周向加强筋832的沿其长度方向的截面形状也可以其他形状，比如矩形，但不限于此。
本申请实施例还提供一种电池单体20的制备方法，其中，未详述的部分可以参见前述的各实施例。
如图3、图4、图7、图10所示，连接件80包括至少两个非弯折部和连接于相邻两个非弯折部之间的弯折部84。连接件80通过采用这种具有非弯折部和弯折部84组成的结构，在组装时，连接件80可以为展开状态，方便连接件80与电极端子60和极耳连接，当端盖组件50覆盖壳体30的开口时，连接件80可以在壳体30内弯折成层叠式结构，降低连接件80在电池单体20内部的占用空间，以提高电池单体20的能量密度。
在一种可选的实施例中，至少两个非弯折部包括第一非弯折部85、第二非弯折部86和第三非弯折部87，其中，第二非弯折部86位于第一非弯折部85和第三非弯折部87，第一非弯折部85与电极端子60连接，第三非弯折部87与电极组件40的极耳连接。连接件80可以采用焊接的方式进行连接，比如激光焊接、超声焊接等，连接件80与电极端子60连接时，只需要将第一非弯折部85与电极端子60焊接，连接件80与极耳连接时，只需要将第三非弯折部87与极耳焊接，不需要对连接件80整体进行焊接，大大降低了连接件80与电极端子60和极耳的焊接难度。
需要说明的是，前述各实施例中的第二配合部81、第四配合部82、加强块83分别设置于连接件80的第一非弯折部85上。
上文描述了本申请实施例的端盖组件50、电池单体20、电池10和用电装置，下面将描述本申请实施例的制备电池单体20的方法，其中未详细描述的部分可参见前述各实施例。
本申请还提供一种电池单体20制备方法300，如图3至图11所示，图11为本申请实施例电池单体制备方法300的示意性流程图。
电池单体20制备方法300包括以下步骤：
301：提供端盖组件50，端盖组件50包括：端盖70，端盖70设有电极引出孔72，端盖70朝向电池单体20内部的一侧设有第一配合部71；电 极端子60，电极端子60设置于端盖70，并覆盖电极引出孔72；以及连接件80，连接件80用于电连接电极端子60和电池单体20的电极组件40，连接件80设有第二配合部81，第二配合部81被配置为与第一配合部71配合，以提供连接件80沿电极引出孔72径向的抗变形力；
302：提供电极组件40，电极组件40包括主体部和极耳；
303：提供壳体30，壳体30设有开口；
304：将电极组件40收容于壳体30内，连接件80连接极耳和电极端子60，端盖组件50覆盖开口，以将电极组件40封闭于壳体30内。
在端盖组件50中，通过第一配合部71和第二配合部81相互配合，使得端盖70与连接件80在第一配合部71和第二配合相配合的位置可以起到相互支撑的作用，提高了连接件80的结构强度，使得连接件80在沿径向方向的抗变形能力变强，从而解决连接件80因结构强度低导致发生变形而与电极端子60脱离的问题。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换，但这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (17)

  1. 一种端盖组件，用于电池单体，其特征在于，包括：
    端盖(70)，所述端盖(70)设有电极引出孔(72)，所述端盖(70)朝向所述电池单体内部的一侧设有第一配合部(71)；
    电极端子(60)，所述电极端子(60)设置于所述端盖(70)，并覆盖所述电极引出孔(72)；以及
    连接件(80)，所述连接件(80)用于电连接所述电极端子(60)和所述电池单体的电极组件(40)，所述连接件(80)设有第二配合部(81)，所述第二配合部(81)被配置为与所述第一配合部(71)配合，以提供所述连接件(80)沿所述电极引出孔(72)径向的抗变形力。
  2. 根据权利要求1所述的端盖组件，其特征在于，所述第一配合部(71)与所述第二配合部(81)沿所述电极引出孔(72)的轴向插接配合。
  3. 根据权利要求2所述的端盖组件，其特征在于，所述第一配合部(71)和所述第二配合部(81)中的其中一者为第一连接凸部，另一者为第一连接孔，所述第一连接凸部至少部分位于对应的所述第一连接孔内，并且所述第一配合部(71)设置于所述电极引出孔(72)的外周。
  4. 根据权利要求1-3任一项所述的端盖组件，其特征在于，所述端盖(70)设有多个所述第一配合部(71)，多个所述第一配合部(71)沿着所述电极引出孔(72)的周向均匀分布；
    所述连接件(80)设有多个所述第二配合部(81)，所述第二配合部(81)与所述第一配合部(71)对应设置。
  5. 根据权利要求3或4所述的端盖组件，其特征在于，所述第一配合部(71)为第一连接凸部，所述第一连接凸部沿着轴向的投影与所述电极端子(60)至少部分重叠。
  6. 根据权利要求1-5任一项所述的端盖组件，其特征在于，所述端盖组件还包括第一绝缘件(90)，所述第一绝缘件(90)设置于所述端盖(70)与所述连接件(80)之间，所述第一绝缘件(90)设有绝缘部(91)，所述绝缘部(91)具有容纳腔，所述容纳腔用于容纳所述第一配合部(71)和/或所述第二配合部(81)，以隔离所述端盖(70)和所述连接件(80)。
  7. 根据权利要求1-6任一项所述的端盖组件，其特征在于，所述电极端子(60)设有第三配合部(61)，所述连接件(80)上设有与所述第三配合部(61)相配合的第四配合部(82)，所述第四配合部(82)与所述第三配合部(61)中的至少一者伸入所述电极引出孔(72)与另一者固定连接。
  8. 根据权利要求7所述的端盖组件，其特征在于，所述第三配合部(61)与所述第四配合部(82)沿所述电极引出孔(72)的轴向插接配合。
  9. 根据权利要求8所述的端盖组件，其特征在于，所述第三配合部(61)包括第二连接凸部，所述第四配合部(82)包括第二连接孔(821)，所述第二连接凸部固定于所述第二连接孔(821)内。
  10. 根据权利要求9所述的端盖组件，其特征在于，所述第四配合部(82)还包括第三连接凸部(822)，所述第三连接凸部(822)沿着所述电极引出孔(72)的轴向向靠近所述端盖(70)的一侧延伸，所述第二连接孔(821)设置于所述第三连接凸部(822)上。
  11. 根据权利要求10所述的端盖组件，其特征在于，所述连接件(80)背离所述电极引出孔(72)的一侧向靠近所述电极引出孔(72)的方向凹陷以形成所述第三连接凸部(822)，并且所述第二连接孔(821)的内周壁沿着所述第二连接孔(821)的轴向方向向远离所述端盖(70)的方向延伸形成凸缘(823)，所述凸缘(823)与所述第三连接凸部(822)的外周壁接触。
  12. 根据权利要求10或11所述的端盖组件，其特征在于，所述第三连接凸部(822)至少部分容纳于所述电极引出孔(72)内。
  13. 根据权利要求1-12任一项所述的端盖组件，其特征在于，所述连接件(80)还包括至少两个加强块(83)，所述加强块(83)与所述第二配合部(81)沿着所述电极引出孔(72)的周向交替设置。
  14. 一种电池单体，其特征在于，包括：
    壳体(30)，所述壳体(30)具有开口；
    电极组件(40)，所述电极组件(40)收容于所述壳体(30)内，所述电极组件(40)包括主体部和极耳；以及
    根据权利要求1-12任一项所述的端盖组件，所述端盖(70)覆盖所述壳体(30)的开口，以将所述电极组件(40)封闭在所述壳体(30)内， 所述连接件(80)连接所述极耳和所述电极端子(60)。
  15. 一种电池，其特征在于，包括如权利要求14所述电池单体。
  16. 一种用电装置，其特征在于，包括如权利要求14所述的电池单体，所以电池单体用于供电。
  17. 一种制备电池单体的方法，其特征在于，包括：
    提供端盖组件，所述端盖组件包括：
    端盖(70)，所述端盖(70)设有电极引出孔(72)，所述端盖(70)朝向所述电池单体内部的一侧设有第一配合部(71)；
    电极端子(60)，所述电极端子(60)设置于所述端盖(70)，并覆盖所述电极引出孔(72)；以及
    连接件(80)，所述连接件(80)用于电连接所述电极端子(60)和所述电池单体的电极组件(40)，所述连接件(80)设有第二配合部(81)，所述第二配合部(81)被配置为与所述第一配合部(71)配合，以提供所述连接件(80)沿所述电极引出孔(72)径向的抗变形力；
    提供电极组件(40)，所述电极组件(40)包括主体部和极耳；
    提供壳体(30)，所述壳体(30)设有开口；
    将所述电极组件(40)收容于所述壳体(30)内，所述连接件(80)连接所述极耳和所述电极端子(60)，所述端盖组件覆盖所述开口，以将所述电极组件(40)封闭于所述壳体(30)内。
PCT/CN2021/076283 2021-02-09 2021-02-09 端盖组件、电池单体、电池、用电装置及制备方法 WO2022170488A1 (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116014319A (zh) * 2023-02-09 2023-04-25 深圳海润新能源科技有限公司 储能装置及用电设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208368557U (zh) * 2018-07-23 2019-01-11 宁德时代新能源科技股份有限公司 动力电池的顶盖组件及动力电池
CN208819974U (zh) * 2018-10-31 2019-05-03 宁德时代新能源科技股份有限公司 二次电池
CN209401724U (zh) * 2019-03-29 2019-09-17 宁德时代新能源科技股份有限公司 二次电池及电池模组
CN209626264U (zh) * 2019-03-29 2019-11-12 宁德时代新能源科技股份有限公司 二次电池
CN211295161U (zh) * 2020-01-11 2020-08-18 苏州炬鸿通讯电脑科技有限公司 一种平板式高容量高性能锂电池盖板

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207800663U (zh) * 2018-02-01 2018-08-31 广东微电新能源有限公司 用于电池的帽盖组件以及电池
CN116780126A (zh) * 2020-04-09 2023-09-19 宁德时代新能源科技股份有限公司 电池、电池组、用电设备和电池的制造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208368557U (zh) * 2018-07-23 2019-01-11 宁德时代新能源科技股份有限公司 动力电池的顶盖组件及动力电池
CN208819974U (zh) * 2018-10-31 2019-05-03 宁德时代新能源科技股份有限公司 二次电池
CN209401724U (zh) * 2019-03-29 2019-09-17 宁德时代新能源科技股份有限公司 二次电池及电池模组
CN209626264U (zh) * 2019-03-29 2019-11-12 宁德时代新能源科技股份有限公司 二次电池
CN211295161U (zh) * 2020-01-11 2020-08-18 苏州炬鸿通讯电脑科技有限公司 一种平板式高容量高性能锂电池盖板

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4080654A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116014319A (zh) * 2023-02-09 2023-04-25 深圳海润新能源科技有限公司 储能装置及用电设备
CN116014319B (zh) * 2023-02-09 2023-06-06 深圳海润新能源科技有限公司 储能装置及用电设备

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