CN217848132U - End cover assembly, battery monomer, battery and power consumption device - Google Patents

Abstract

The application provides an end cover subassembly, battery monomer, battery and power consumption device, this end cover subassembly includes: an end cap provided with an electrode lead-out hole; a terminal plate disposed at one side of the end cap; the pole column penetrates through the electrode leading-out hole and is connected with the terminal board; a seal at least partially disposed between the post and the end cap; and the isolating piece is at least partially arranged between the terminal board and the end cover so as to isolate the terminal board from the end cover, a sealing structure is arranged between the isolating piece and the end cover, and/or a sealing structure is arranged between the isolating piece and the terminal board. From this, set up the basis of sealing member between utmost point post and the end cover, further add one or multichannel seal structure in the one side that deviates from the battery monomer inside of end cover to reduce the inside electrolyte of battery and draw the volume that flows to the one side that deviates from the battery monomer inside of end cover and outside steam infiltration advance the inside volume of battery after the hole is oozed from the electrode, thereby improve the free leakproofness of battery.

Description

End cover assembly, battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to an end cover assembly, a battery monomer, a battery and an electric device.

Background

This section provides background information related to the present application and is not necessarily prior art.

The battery cell includes an end cap, a case, an electrode assembly, and other functional components as the smallest unit constituting the battery. The end cover is covered on the opening of the shell to isolate the internal environment of the battery cell from the external environment, functional components such as an electrode terminal and the like can be arranged on the end cover, the electrode terminal is generally arranged on the end cover in a penetrating way and electrically connected with the electrode component, electrolyte is also arranged in the battery cell, and in order to avoid electrolyte leakage, a sealing element is usually arranged at a gap between the inner wall of the through hole arranged on the end cover and the electrode terminal to seal, so that the safety of the battery is guaranteed.

SUMMERY OF THE UTILITY MODEL

The present application has been made in view of the above problems, and an object thereof is to improve the sealing performance of a battery cell.

In order to achieve the purpose, the application provides an end cover assembly, a battery cell, a battery and an electric device. The specific technical scheme is as follows:

an embodiment of a first aspect of the present application provides an end cap assembly, comprising: an end cap provided with an electrode lead-out hole; a terminal plate disposed at one side of the end cap; the pole column penetrates through the electrode leading-out hole and is connected with the terminal plate; a seal disposed at least partially between the post and the end cap; a spacer at least partially disposed between the terminal plate and the end cap to separate the terminal plate from the end cap, and a sealing structure disposed between the spacer and the end cap, and/or a sealing structure disposed between the spacer and the terminal plate.

According to the end cover assembly provided by the embodiment of the application, on one hand, a sealing element is arranged between the pole and the end cover so as to seal at least the inner wall of the electrode lead-out hole formed in the end cover and the pole, and the amount of electrolyte in a battery monomer flowing into a gap between the inner wall of the electrode lead-out hole and the pole is reduced, so that the possibility of leakage of the electrolyte from the gap between the inner wall of the electrode lead-out hole and the pole is reduced; on the other hand, a separator is arranged between a terminal plate exposed outside the battery cell and the end cover, a sealing structure is arranged between the separator and the end cover, and/or a sealing structure is arranged between the separator and the terminal plate, namely on the basis of arranging a sealing part between the pole and the end cover, one or more sealing structures are further additionally arranged on one side of the end cover departing from the inside of the battery cell, so that the amount of electrolyte inside the battery cell which flows to one side of the end cover departing from the inside of the battery cell after seeping out from the electrode leading-out hole and the amount of external water vapor permeating into the inside of the battery cell are reduced, and the sealing performance of the battery cell is improved.

In some embodiments of the application, the spacer is provided with a sealing structure that interferes with the end cap, a gap being provided between a portion of a face of the spacer facing the end cap not provided with the sealing structure and the end cap. Therefore, the sealing structure is abutted against the end cover by proper compression amount, the possibility of over-compression of the sealing structure is reduced, and the sealing effect is improved.

In some embodiments of the present application, the end cap includes a first region opposite to the terminal plate, a surface of the first region facing the separator being a plane. In this way, it is more convenient to realize that a certain gap is kept between the end cover and the part of one surface of the spacer facing the end cover, which is not provided with the sealing structure, while the sealing structure is pressed against the end cover.

In some embodiments of the present application, the separator is provided with a sealing structure that interferes with the terminal plate, and a portion of a face of the separator facing the terminal plate, at which the sealing structure is not provided, has a gap from the terminal plate. Therefore, the sealing structure is abutted against the terminal plate by a proper compression amount, the possibility of over-compression of the sealing structure is reduced, and the sealing effect is improved.

In some embodiments of the present application, a surface of the terminal plate facing the separator is a plane. In this way, it is more convenient to maintain a certain gap between the terminal plate and the portion of the separator facing the one surface of the terminal plate where the seal structure is not provided, while the seal structure is compressed against the terminal plate.

In some embodiments of the present application, the seal structure is a unitary structure with the spacer. Thus, on the one hand, the assembly of the end cap assembly can be more conveniently realized, and on the other hand, the possibility that the electrolyte flows into the gap between the sealing structure and the separator is also reduced, so that the overall sealing reliability is further improved.

In some embodiments of the present application, the sealing structure has a melting point greater than 150 ℃. Therefore, the sealing structure can better adapt to the environment with heat generation and temperature rise nearby, the possibility that the sealing structure is melted due to the heat of the surrounding environment is reduced, and the influence of the temperature rise on the sealing reliability of the sealing structure is reduced.

In some embodiments of the present application, the material of the sealing structure comprises one or more of: meltable polytetrafluoroethylene, fluororubber, ethylene propylene diene monomer. Satisfy the elasticity demand that seal structure can produce certain compression capacity under the pressurized condition with this, and adaptable reduce the possibility that seal structure is heated and melts in the free temperature rise environment of battery, simultaneously, strengthen seal structure's chemical stability to reduce it and receive the inside electrolyte corrosion of battery and lead to the possibility of sealed inefficacy, thereby provide better sealed guarantee.

In some embodiments of the present application, the end cap is provided with a sealing structure that interferes with the spacer. Therefore, the amount of electrolyte flowing into the gap between the end cover and the isolating piece and the amount of external water vapor permeating into the battery monomer are reduced, and the sealing performance of the battery monomer is improved.

In some embodiments of the present application, the sealing structure is a unitary structure with the end cap. So as to facilitate the assembly of the end cap assembly more, and at the same time, reduce the possibility of the electrolyte flowing into the gap between the sealing structure and the end cap, thereby further improving the overall sealing reliability.

In some embodiments of the present application, the terminal plate is provided with a sealing structure that interferes with the separator. Therefore, the amount of electrolyte flowing into the gap between the terminal plate and the isolating piece and the amount of external water vapor permeating into the battery cell are reduced, and the sealing performance of the battery cell is improved.

In some embodiments of the present application, the sealing structure is a unitary structure with the terminal plate. So as to facilitate the assembly of the end cap assembly and, at the same time, reduce the possibility of electrolyte flowing into the gap between the sealing structure and the terminal plate, thereby further improving the overall sealing reliability.

In some embodiments of the present application, the sealing structure is an annular structure disposed around a perimeter of the electrode lead-out aperture. Therefore, the amount of electrolyte flowing into the gap between the end cover and the isolating piece and/or the gap between the terminal plate and the isolating piece and the amount of external moisture permeating into the interior of the battery cell can be reduced better, and the sealing performance of the battery cell is improved.

In some embodiments of the present application, the number of the sealing structures is plural, and the plural sealing structures are arranged in a radial direction of the electrode lead-out hole. Multiple seals are thereby formed in the gap between the end cap and the separator and/or in the gap between the terminal plate and the separator, thereby further improving the sealing reliability of the battery cell.

In some embodiments of the present application, the terminal post is riveted with the terminal plate to better provide a pressing force for the sealing structure, so that the sealing structure is kept at a certain compression amount, thereby ensuring the sealing performance of the sealing structure.

In some embodiments of the present application, the end cap assembly further includes a current collecting member for connecting the terminal post and the electrode assembly of the battery cell, and the terminal post is riveted with the current collecting member to better provide a pressing force to the sealing structure, so that the sealing structure is maintained at a certain amount of compression, thereby ensuring the sealing performance of the sealing structure.

Embodiments of a second aspect of the present application provide a battery cell, including: a housing having an opening; an electrode assembly housed within the case; according to the end cover assembly provided by the embodiment of the first aspect of the application, the end cover assembly covers the opening, and the terminal plate of the end cover assembly is arranged on one side of the end cover, which faces away from the interior of the battery cell. The embodiment of the second aspect of the application provides a battery cell with better sealing performance and higher safety.

Embodiments of the third aspect of the present application provide a battery, including providing a battery cell according to embodiments of the second aspect of the present application. The embodiment of the third aspect of the application provides a battery with better sealing performance and higher safety.

Embodiments of a fourth aspect of the present application provide an electric device, including a battery cell for providing electric energy according to embodiments of the second aspect of the present application. The battery cell used in the electric device provided by the embodiment of the fourth aspect of the application has better sealing performance and higher safety.

Drawings

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;

FIG. 3 is a schematic structural view of an end cap assembly according to some embodiments of the present application;

FIG. 4 is an exploded view of an end cap assembly according to some embodiments of the present application;

FIG. 5 is an enlarged view of a portion of the structure of FIG. 3 at A;

FIG. 6 is an enlarged view of a portion of the structure at B in FIG. 5;

fig. 7 is a schematic structural diagram illustrating a sealing structure disposed on a terminal plate and an end cap in an end cap assembly according to some embodiments of the present disclosure.

The reference numbers in the detailed description are as follows:

a vehicle 1000; a battery cell 700; a controller 200; a motor 300;

a battery 7000; a case 80; a first module 81; a second module 82;

an end cap assembly 100; an end cap 1; a pole 21; a terminal plate 212; a seal member 3; a spacer 6; a seal structure 7; current collecting member 22, insulator 8.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing the association object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the indicated orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The battery cell includes an end cap, a case, an electrode assembly, and other functional components as the smallest unit constituting the battery. The end cover is covered on the opening of the shell to isolate the internal environment of the battery cell from the external environment, functional components such as an electrode terminal and the like can be arranged on the end cover, the electrode terminal generally penetrates through a through hole formed in the end cover and is electrically connected with the electrode assembly through a current collecting component, electrolyte is also arranged in the battery cell, and in order to avoid electrolyte leakage, a sealing element is usually arranged at a gap between the inner wall of the through hole formed in the end cover and the electrode terminal to seal the gap, so that the safety of the battery is guaranteed.

The inventor finds that in practical application, the sealing reliability of the battery cell is low, and the leakage phenomenon of the battery still often occurs. The inventor analyzes and finds that assembly tolerance of the sealing element may occur in the process of assembling all parts on the end cover, so that the sealing effect of the sealing element is poor, and the sealing effect of the sealing element is reduced due to aging of the sealing element, so that the sealing failure of the battery is caused, electrolyte leakage and other phenomena are caused, and the potential safety hazard of the battery is caused.

In view of the above, in order to solve the problem of low sealing reliability of the battery cell, the inventors have made extensive studies and have proposed an end cap assembly in which a sealing member is disposed in a gap between an inner wall of a through hole formed in an end cap thereof and an electrode terminal, a separator is disposed between a side of the end cap facing away from the inside of the battery cell and a terminal plate of the electrode terminal, and a sealing structure is disposed in the gap between the separator and the end cap and/or the gap between the separator and the terminal plate, thereby increasing the sealing reliability, and reducing the possibility of leakage of an electrolyte in the battery cell as much as possible, thereby improving the sealing reliability of the entire battery cell.

The embodiment of the application provides an electric device using a battery as a power supply, which 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 automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

For convenience of description, the following embodiments take an example in which a power consuming apparatus according to an embodiment of the present application is a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The interior of vehicle 1000 is provided with battery 7000, and battery 7000 may be provided at the bottom or at the head or tail of vehicle 1000. Battery 7000 may be used for power supply of vehicle 1000, and battery 7000 may serve as an operation power source of vehicle 1000, for example. Vehicle 1000 may also include a controller 200 and a motor 300, controller 200 being configured to control battery 7000 to power motor 300, e.g., for starting, navigation, and operation of vehicle 1000

And (4) demand.

In some embodiments of the present application, battery 7000 may be used not only as an operating power source of vehicle 1000, but also as a driving power source of vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for vehicle 1000.

Reference to battery 7000 in the embodiments of the present application is intended to refer to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

Referring to fig. 2, fig. 2 is an exploded view of a battery 7000 according to some embodiments of the present application. The battery 7000 includes a case 80 and a battery cell 700, and the battery cell 700 is accommodated in the case 80. The case 80 is used to provide a receiving space for the battery cells 700, and the case 80 may have various structures. In some embodiments, the case 80 may include a first module 81 and a second module 82, the first module 81 and the second module 82 cover each other, and the first module 81 and the second module 82 together define a receiving space for receiving the battery cell 700. The second module 82 may be a hollow structure with an open end, the first module 81 may be a plate-shaped structure, and the first module 81 covers the open side of the second module 82, so that the first module 81 and the second module 82 jointly define an accommodating space; the first module 81 and the second module 82 may be both hollow structures with one side open, and the open side of the first module 81 is covered on the open side of the second module 82. Of course, the case 80 formed by the first module 81 and the second module 82 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 7000, the battery cell 700 may be a plurality of battery cells 700, and the plurality of battery cells 700 may be connected in series or in parallel or in series-parallel, where the series-parallel refers to both series connection and parallel connection among the plurality of battery cells 700. The plurality of battery cells 700 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 700 is accommodated in the box body 80; of course, the battery 7000 may also be formed by connecting a plurality of battery cells 700 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodated in the box 80. The battery 7000 may also include other structures, for example, the battery 7000 may also include a bus member for achieving electrical connection between the plurality of battery cells 700.

Each battery cell 700 may be a secondary battery or a primary battery; but is not limited to, a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 700 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

The battery cell 700 refers to the smallest unit constituting the battery. The battery cell 700 includes an end cap 1, a case, and an electrode assembly.

The end cap 1 refers to a member that covers an opening of the case to isolate the internal environment of the battery cell 700 from the external environment. Without limitation, the shape of the end cap 1 may be adapted to the shape of the housing to fit the housing. Alternatively, the end cap 1 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the end cap 1 is not easily deformed when being extruded and collided, and thus the battery cell 700 may have higher structural strength and the safety performance may be improved. In some embodiments, as shown in fig. 3 and 4, an insulator 8 may also be provided on one side of the end cap 1, and the insulator 8 may be used to isolate the electrical connection components within the housing 900 from the end cap 2 to reduce the risk of short circuits. Illustratively, the insulator 8 may be plastic, rubber, or the like.

In some embodiments, functional components such as electrode terminals and the like may be provided on the end cap 1. The electrode terminals may be used to be electrically connected with the electrode assembly for outputting or inputting electric energy of the battery cell 700. In some embodiments, the end cap 1 may further include a pressure relief mechanism for relieving the internal pressure when the internal pressure or temperature of the battery cell 700 reaches a threshold value. The material of the end cap 1 may also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, etc., which is not limited in this embodiment.

The case is an assembly for fitting the end cap 1 to form an internal environment of the battery cell 700, wherein the formed internal environment may be used to house the electrode assembly, the electrolyte, and other components. The housing and the end cap 1 may be separate components, and an opening may be formed in the housing, and the opening may be covered by the end cap 1 to form the internal environment of the battery cell 700. The housing may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the case may be determined according to the specific shape and size of the electrode assembly. The material of the housing may be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this application.

The electrode assembly is a part in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies may be contained within the housing. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portions of the electrode assembly, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery cell 100, the positive and negative active materials react with the electrolyte, and the tabs electrically connect the electrode terminals to form a current loop. Generally, the tab is connected to the electrode terminal through a current collecting member.

The end cover assembly disclosed in the embodiment of the application can be applied to the assembly of any battery monomer, for example, a cylindrical battery monomer, a square battery monomer or a soft package battery monomer, the packaging mode of the battery monomer is not limited, the battery monomer can be a cylinder, a flat body, a cuboid or other shapes, and the like, and the embodiment of the application is not limited to this. The battery cell in the embodiment of the present application may be used in an electric device such as a vehicle, a ship, or an aircraft, but is not limited thereto. The end cover assembly disclosed by the embodiment of the application isolates the internal environment of the battery cell from the external environment, so that the sealing performance of the battery cell can be better guaranteed, the possibility of leakage of electrolyte inside the battery cell is reduced, and the safety of the battery is improved.

As shown in fig. 3 to 7, an embodiment of the first aspect of the present application provides an end cap assembly 100 including an end cap 1, a terminal plate 212, a pole 21, a seal member 3, and a spacer 6. Wherein, the end cover 1 is provided with an electrode leading-out hole; the terminal plate 212 is provided on one side of the end cover 1; the pole 21 is arranged in the electrode leading-out hole and connected with the terminal plate 212; the sealing member 3 is at least partially arranged between the pole 21 and the end cap 1; the separator 6 is at least partially disposed between the terminal plate 212 and the end cap 1 to separate the terminal plate 212 from the end cap 1, and the seal structure 7 is disposed between the separator 6 and the end cap 1, and/or the seal structure 7 is disposed between the separator 6 and the terminal plate 212.

The end cap 1 may be understood as a structure covering an opening of a case of a battery cell, conforming to the shape of the case to form a space to accommodate and limit an electrode assembly in cooperation with the case.

The electrode lead-out hole may be a through hole penetrating one surface of the end cap 1 facing the inside of the battery cell and the other surface facing away from the inside of the battery cell.

The terminal plate 212 may be understood as a connection structure exposed to the outside of the battery cell. In one case, the terminal plate 212 may be a member for electrically connecting to a conductor outside the battery cell.

The electrode post 21 may be understood as a member, which extends into the battery cell along the axial direction of the electrode lead-out hole at one end thereof to connect with other electrical connection members to connect with the electrode assembly of the battery cell, and is used for outputting or inputting electrical energy inside the battery cell.

The sealing member 3 may be understood as a material or a member for blocking inflow of fluid or solid particles into a gap between facing joint surfaces of two members and intrusion of foreign substances such as dust and moisture into the inside of the battery cell. For example, the opposing interface between the terminal post 21 and the end cap 1 may include both the outer wall of the cylindrical structure through which the terminal post 21 is inserted into the electrode extraction hole and the inner wall of the electrode extraction hole. In general, the sealing member 3 is made of elastic material, such as rubber, silicon, etc., and in order to make the adjacent joint surfaces tightly fit, the sealing member 3 is disposed between the adjacent joint surfaces, so that the sealing member 3 maintains a certain amount of compression, and the gap between the sealing member 3 and the adjacent joint surfaces can be reduced as much as possible, thereby improving the sealing effect between the adjacent joint surfaces.

The spacer 6 may be understood as a structure that fills in a gap between at least two parts to separate the at least two parts. For example, the spacer 6 may be made of plastic, rubber, or the like, and the spacer 6 has good insulation property, so that the possibility of potential safety hazard caused by electrical conduction between the terminal plate 212 and the end cap 1 can be reduced.

The seal structure 7 may be understood as a material or a member for blocking the flow of fluid or solid particles into the gap between the separator 6 and the end cap 1 and/or the gap between the separator 6 and the terminal plate 212. For example, the sealing structure 7 may be made of a material with elasticity, such as rubber, silicone, etc., so as to form a certain amount of compression when it is located between the spacer 6 and the end cap 1, and/or between the spacer 6 and the terminal plate 212, thereby ensuring the sealing effect; alternatively, when the first spacer 4 has elasticity, the sealing structure 7 may be made of a metal material so that the spacer 6 is compressed by a certain amount when the sealing structure 7 abuts against the spacer 6, thereby ensuring sealing.

According to the end cap assembly 100 provided by the embodiment of the application, on one hand, the sealing element 3 is arranged between the pole 21 and the end cap 1 so as to seal at least the space between the inner wall of the electrode lead-out hole formed in the end cap 1 and the pole 21, so that the amount of electrolyte in a single battery flowing into the gap between the inner wall of the electrode lead-out hole and the pole 21 is reduced, and the possibility of leakage of the electrolyte from the gap between the inner wall of the electrode lead-out hole and the pole 21 is reduced; on the other hand, a separator 6 is further arranged between the terminal plate 212 exposed outside the battery cell and the end cover 1, and a sealing structure 7 is arranged between the separator 6 and the end cover 1, and/or a sealing structure 7 is arranged between the separator 6 and the terminal plate 212, namely on the basis that a sealing part 3 is arranged between the pole 21 and the end cover 1, one or more sealing structures are further additionally arranged on one side of the end cover 1 departing from the inside of the battery cell, so that the amount of electrolyte inside the battery cell which flows to one side of the end cover 1 departing from the inside of the battery cell after seeping out from the electrode leading-out hole and the amount of external water vapor permeating into the inside of the battery cell are reduced, and the sealing performance of the battery cell is improved.

In some embodiments of the present application, as shown in fig. 5 and 6, the separator 6 is provided with a seal structure 7 that interferes with the end cap 1, and a portion of a face of the separator 6 facing the end cap 1, where the seal structure 7 is not provided, has a gap with the end cap 1.

Therefore, the sealing structure 7 is abutted against the end cover 1 by a proper compression amount, the possibility of over-compression of the sealing structure 7 is reduced, and the sealing effect is improved.

For example, as shown in fig. 6, the size of the gap between the end cap 1 and the portion of the side of the separator 6 facing the end cap 1 where the seal structure 7 is not provided is denoted by c, and in one case, c may be set in a range greater than 0mm and less than 0.5mm to accommodate the amount of compression required by the seal structure 7 to form the sealing effect between the separator 6 and the end cap 2; or in some embodiments, c may be set within a range greater than 0.1mm and less than 0.3mm, so that the sealing structure 7 is at a more appropriate compression amount while abutting against the end cap 1, and the possibility of insufficient compression amount or excessive compression is reduced, thereby improving the sealing effect.

In some embodiments of the present application, as shown in fig. 6, the end cap 1 includes a first region opposite to the terminal plate 212, the surface of the first region facing the separator 6 being a plane.

In this way, it is more convenient to maintain a certain gap between the end cover 1 and the portion of the surface of the spacer 6 facing the end cover 1 where the seal structure 7 is not provided, while the seal structure 7 is compressed by abutting against the end cover 1.

In some embodiments of the present application, as shown in fig. 6, the separator 6 is provided with the sealing structure 7 interfering with the terminal plate 212, and a portion of the side of the separator 6 facing the terminal plate 212 where the sealing structure 7 is not provided has a gap from the terminal plate 212.

Thereby, seal structure 7 is made to abut against terminal plate 212 by an appropriate amount of compression, the possibility of occurrence of excessive compression of seal structure 7 is reduced, and the sealing effect is improved.

Similarly to the sealing structure 7 disposed in the gap between the separator 6 and the end cap 1 and abutting against the end cap 1, in order to accommodate the amount of compression required by the sealing structure 7 to form the sealing effect between the separator 6 and the terminal plate 212, as shown in fig. 6, the size d of the gap between the terminal plate 212 and the portion of the side of the separator 6 facing the terminal plate 212 where the sealing structure 7 is not disposed may be set within a range greater than 0mm and less than 0.5mm, or in some embodiments, within a range greater than 0.1mm and less than 0.3mm, so that the sealing structure 7 is in a more appropriate amount of compression while abutting against the terminal plate 212, reducing the possibility of occurrence of insufficient or excessive compression of the amount of compression, and thus improving the sealing effect.

In some embodiments of the present application, as shown in fig. 6, the surface of the terminal plate 212 facing the separator 6 is a flat surface.

In this way, it is more convenient to maintain a certain gap between the terminal plate 212 and the portion of the surface of the separator 6 facing the terminal plate 212 where the seal structure 7 is not provided, while the seal structure 7 is compressed against the terminal plate 212.

In some embodiments of the present application, as shown in fig. 6, the seal structure 7 is a unitary structure with the spacer 6.

In this way, on the one hand, the assembly of the end cap assembly 100 can be more easily achieved, and on the other hand, the possibility of the electrolyte flowing into the gap between the sealing structure 7 and the separator 6 is also reduced, thereby further improving the overall sealing reliability.

In some embodiments of the present application, the sealing structure 7 has a melting point greater than 150 ℃.

For example, there may be a welding type connection between the terminal post 21 and the terminal plate 212, and between the terminal plate 212 and the end cap 1, and heat is easily generated and heated when the welding operation is performed at a position near the sealing structure 7, so as to affect the sealing structure 7, and the sealing structure 7 is made of a material having a melting point greater than 150 ℃, so as to better adapt to an environment where heat is generated and heated near the sealing structure, and reduce the possibility that the sealing structure 7 is melted by the heat of the surrounding environment, thereby reducing the influence of the temperature rise on the sealing reliability of the sealing structure 7.

In some embodiments, the material of the sealing structure 7 may be selected from materials resistant to corrosion of the electrolyte inside the battery cell, specifically determined according to chemical substances contained in the electrolyte inside different battery cells, so as to reduce the possibility of sealing failure caused by corrosion of the sealing structure 7 by the electrolyte.

In some embodiments of the present application, the material of the sealing structure 7 includes one or more of the following: meltable polytetrafluoroethylene, fluororubber, ethylene propylene diene monomer.

The meltable polytetrafluoroethylene is a Danksi fluorine-containing resin, has elasticity, has excellent chemical stability, aging resistance, incombustibility and thermal stability, is similar to polytetrafluoroethylene, has higher mechanical strength in a high-temperature environment and has a melting point of more than 320 ℃.

The fluororubber is a synthetic macromolecular elastomer containing fluorine atoms on carbon atoms of a main chain or a side chain, has relatively good chemical stability, aging resistance, non-combustibility and thermal stability, has the characteristic of resisting corrosion of various chemical substances, and has a melting point of more than 200 ℃.

Ethylene propylene diene is a terpolymer of ethylene, propylene and a non-conjugated diene that has excellent oxidation and erosion resistance and is elastomeric with a melting point greater than 230 ℃.

It can be seen that no matter the material of the sealing structure 7 includes any one or more of fusible polytetrafluoroethylene, fluororubber, and ethylene propylene diene monomer, the elastic requirement that the sealing structure 7 can generate a certain amount of compression under a compression condition can be met, the sealing structure is adaptable to reducing the possibility that the sealing structure 7 is heated and melted in the temperature rise environment of the battery cell, and meanwhile, the chemical stability of the sealing structure 7 is enhanced to reduce the possibility that the sealing structure is corroded by electrolyte inside the battery cell to cause sealing failure, so that a better sealing guarantee is provided.

In some embodiments of the present application, as shown in fig. 7, the end cap 1 is provided with a sealing structure 7 that interferes with the spacer 6.

Thus, the amount of electrolyte flowing into the gap between the end cap 1 and the separator 6 and the amount of external moisture permeating into the interior of the battery cell are reduced, thereby improving the sealability of the battery cell.

Similar to the embodiment in which the sealing structure 7 is disposed on the spacer 6 to be in contact with the end cap 1, a gap is provided between the spacer 6 and a portion of one surface of the end cap 1 facing the spacer 6 where the sealing structure 7 is not disposed, so that the sealing structure 7 is in contact with the spacer 6 by a suitable amount of compression, thereby reducing the possibility of occurrence of over-compression and improving the sealing effect.

In order to accommodate the amount of compression required by the sealing structure 7 to form the sealing effect between the spacer 6 and the end cap 1, the size of the gap between the portion of the side of the end cap 1 facing the spacer 6 where the sealing structure 7 is not disposed and the spacer 6 may also be set within a range greater than 0mm and less than 0.5mm, or in some embodiments, within a range greater than 0.1mm and less than 0.3mm, so that the sealing structure 7 is in a more appropriate amount of compression while abutting against the spacer 6, the possibility of insufficient or excessive compression of the amount of compression is reduced, and the sealing effect is improved.

In some embodiments, the surface of the spacer 6 facing the end cap 1 that contacts the seal 7 is planar. In this way, it is more convenient to maintain a certain gap between the spacer 6 and the portion of the end cap 1 facing the spacer 6 where the seal structure 7 is not provided, while the seal structure 7 is compressed against the spacer 6.

In some embodiments of the present application, as shown in fig. 7, the seal structure 7 is a unitary structure with the end cap 1.

To further facilitate assembly of the end cap assembly 100 while reducing the likelihood of electrolyte flowing into the gap between the sealing structure 7 and the end cap 1, thereby further improving overall sealing reliability.

Under the condition that seal structure 7 and end cover 1 formula structure as an organic whole, the material of seal structure 7 is the metal material usually, adaptability ground, and under this condition, isolator 6 optional has elastic material, such as rubber, silica gel to make isolator 6 produce certain compressive strain when seal structure 7 contradicts with isolator 6, thereby form sealed guarantee. In some embodiments, the melting point of spacer 6 is also greater than 150 ℃, so that it better adapts to the environment in the vicinity of which the heat-generating temperature rise occurs, reducing the possibility that spacer 6 will melt due to the heat of the surrounding environment, and thus reducing the effect of the temperature rise on the sealing reliability of spacer 6. In some embodiments, the separator 6 may also be made of a material that is resistant to corrosion by the electrolyte inside the cell, so as to reduce the possibility of seal failure due to the electrolyte corrosion of the separator 6. For example, the material of the spacer 6 may include one or more of fusible polytetrafluoroethylene, fluororubber, and ethylene propylene diene monomer, so as to meet the elastic requirement that the spacer 6 can generate a certain amount of compression under a compression condition, and adapt to reduce the possibility that the spacer 6 is heated and melted in the temperature rise environment of the battery cell, and at the same time, enhance the chemical stability of the spacer 6, so as to reduce the possibility that the spacer is corroded by the electrolyte inside the battery cell to cause sealing failure, thereby providing better sealing guarantee.

In some embodiments of the present application, as shown in fig. 7, the terminal plate 212 is provided with a sealing structure 7 that interferes with the separator 6.

Thereby, the amount of electrolyte flowing into the gap between the terminal plate 212 and the separator 6 and the amount of external moisture permeating into the inside of the battery cell are reduced, thereby improving the sealability of the battery cell.

Similar to the embodiment in which the seal structure 7 is provided on the separator 6 against the terminal plate 212, a portion of the terminal plate 212 facing the side of the separator 6 where the seal structure 7 is not provided has a clearance with the separator 6, so that the seal structure 7 is pressed against the separator 6 by an appropriate amount of compression, reducing the possibility of occurrence of excessive compression, and thus improving the sealing effect.

In order to accommodate the amount of compression required by the seal structure 7 to form the sealing effect between the spacer 6 and the terminal plate 212, the size of the gap between the portion of the terminal plate 212 facing the spacer 6 where the seal structure 7 is not provided and the spacer 6 may be set to be in a range greater than 0mm and less than 0.5mm, or in some embodiments, greater than 0.1mm and less than 0.3mm, so that the seal structure 7 is in a more appropriate amount of compression while abutting against the spacer 6, the possibility of insufficient or excessive compression of the amount of compression is reduced, and the sealing effect is improved.

In some embodiments, the surface of the partition 6 facing the terminal plate 212 in contact with the seal structure 7 is a flat surface. In this way, it is more convenient to maintain a certain gap between the separator 6 and a portion of the surface of the terminal plate 212 facing the separator 6 where the seal structure 7 is not provided, while the seal structure 7 is compressed against the separator 6.

In some embodiments of the present application, as shown in fig. 7, the sealing structure 7 is a unitary structure with the terminal plate 212.

To further facilitate the assembly of the end cap assembly 100 while reducing the possibility of the electrolyte flowing into the gap between the sealing structure 7 and the terminal plate 212, thereby further improving the overall sealing reliability.

In the case that the sealing structure 7 and the terminal plate 212 are of an integrated structure, the material of the sealing structure 7 is usually a metal material, and adaptively, in this case, the spacer 6 may be made of an elastic material, such as rubber, silica gel, or the like, so as to enable the spacer 6 to generate a certain amount of compression when the sealing structure 7 collides with the spacer 6, thereby forming a sealing guarantee. In some embodiments, the melting point of spacer 6 is also greater than 150 ℃, so that it better adapts to the environment in the vicinity of which the heat-generating temperature rise occurs, reducing the possibility that spacer 6 will melt due to the heat of the surrounding environment, and thus reducing the effect of the temperature rise on the sealing reliability of spacer 6. In some embodiments, the separator 6 may also be made of a material that is resistant to corrosion by the electrolyte inside the cell, so as to reduce the possibility of seal failure due to the electrolyte corrosion of the separator 6. For example, the material of the spacer 6 may include one or more of fusible polytetrafluoroethylene, fluororubber, and ethylene propylene diene monomer, so as to satisfy the elastic requirement that the spacer 6 can generate a certain amount of compression under a compression condition, and adapt to the temperature rise environment of the battery cell to reduce the possibility that the spacer 6 is heated and melted, and at the same time, enhance the chemical stability of the spacer 6, so as to reduce the possibility that the spacer is corroded by the electrolyte inside the battery cell to cause sealing failure, thereby providing better sealing guarantee.

In some embodiments of the present application, the sealing structure 7 may also be a member separately disposed between the separator 6 and the terminal plate 212 and/or between the separator 6 and the end cap 1, for example, the sealing structure 7 may be sandwiched or bonded between two adjacent members. For example, the seal structure 7 may be sandwiched between the separator 6 and the terminal plate 212, or may be fixed between the separator 6 and the terminal plate 212 by being bonded to the separator 6 and/or the terminal plate 212. It will be appreciated that the seal 7 may also be clamped or bonded between the spacer 6 and the end cap 1.

In some embodiments of the present application, the sealing structure 7 is an annular structure disposed around the perimeter of the electrode lead-out aperture.

A ring-shaped structure is understood to be a closed structure formed around the circumference of a certain part.

By providing the sealing structure 7 with an annular structure, the amount of electrolyte flowing into the gap between the end cap 1 and the separator 6 and/or the gap between the terminal plate 212 and the separator 6 and the amount of external moisture permeating into the interior of the battery cell can be reduced more effectively, thereby improving the sealability of the battery cell.

In some embodiments of the present application, the number of the sealing structures 7 may be plural, and the plural sealing structures 7 are arranged in a radial direction of the electrode lead-out hole.

Multiple seals are thereby formed in the gap between the end cap 1 and the separator 6 and/or in the gap between the terminal plate 212 and the separator 6, thereby further improving the sealing reliability of the battery cell.

In some embodiments of the present application, the pole 21 is riveted with the terminal plate 212.

For example, as shown in fig. 5, the terminal plate 212 may be provided with a through hole into which the pole 21 is inserted and riveted with the terminal plate 212.

Through riveting of the pole 21 and the terminal plate 212, a pressing force can be better provided for the sealing structure 7, so that the sealing structure 7 is kept at a certain compression amount, and the sealing performance of the sealing structure 7 is guaranteed.

In some embodiments of the present application, as shown in fig. 7, the end cap assembly 100 further includes a current collecting member 22, the current collecting member 22 is used to connect the pole 21 and the electrode assembly of the battery cell, and the pole 21 is riveted to the current collecting member 22.

By riveting the pole 21 and the current collecting member 22, a pressing force can be better provided for the sealing structure 7, so that the sealing structure 7 keeps a certain compression amount, and the sealing performance of the sealing structure 7 is guaranteed.

In some embodiments of the present application, as shown in fig. 3-7, the end cap assembly 100 includes an end cap 1, a terminal plate 212, a post 21, a seal 3, and a separator 6. Wherein, the end cover 1 is provided with an electrode leading-out hole; the terminal plate 212 is provided on one side of the end cap 1; the pole 21 is arranged in the electrode leading-out hole in a penetrating way and riveted with the terminal plate 212; the sealing element 3 is at least partially arranged between the pole 21 and the end cap 1; the separator 6 is at least partially arranged between the terminal plate 212 and the end cover 1 to separate the terminal plate 212 from the end cover 1, a sealing structure 7 is arranged between the separator 6 and the end cover 1, and/or a sealing structure 7 is arranged between the separator 6 and the terminal plate 212, the sealing structure 7 is an annular structure arranged around an electrode leading-out hole periphery, the sealing structure 7 and the separator 6 are of an integrated structure, and the sealing structure 7 is made of one or more of the following materials: meltable polytetrafluoroethylene, fluororubber, ethylene propylene diene monomer.

According to the end cap assembly 100 provided by the embodiment of the application, on one hand, the sealing element 3 is arranged between the pole 21 and the end cap 1 so as to seal at least the space between the inner wall of the electrode lead-out hole formed in the end cap 1 and the pole 21, so that the amount of electrolyte in a single battery flowing into the gap between the inner wall of the electrode lead-out hole and the pole 21 is reduced, and the possibility of leakage of the electrolyte from the gap between the inner wall of the electrode lead-out hole and the pole 21 is reduced; on the other hand, the separator 6 is further arranged between the terminal plate 212 exposed outside the battery cell and the end cover 1, and the sealing structure 7 is arranged between the separator 6 and the end cover 1, and/or the sealing structure 7 is arranged between the separator 6 and the terminal plate 212, and through riveting of the pole 21 and the terminal plate 212, a pressing force is better provided for the sealing structure 7 on the separator 6, so that the sealing structure 7 keeps a certain compression amount, and the sealing performance of the sealing structure 7 is ensured, namely on the basis of arranging the sealing member 3 between the pole 21 and the end cover 1, one or more sealing structures are further additionally arranged on one side of the end cover 1, which is far away from the inside of the battery cell, so that the amount of electrolyte inside the battery cell which flows to the side, which is far away from the inside of the battery cell, of the end cover 1 after seeping out along the electrode lead-out hole and the amount of external water vapor permeating into the inside of the battery cell are reduced, and the sealing performance of the battery cell is improved, moreover, the sealing structure 7 and the separator 6 are of an integrated structure, which is convenient to assemble, and reduce the possibility of the electrolyte flowing into a gap between the sealing structure 7 and the separator 6, so as to further improve the sealing reliability of the whole.

Embodiments of the second aspect of the present application provide a battery cell including a case, an electrode assembly, and an end cap assembly 100 provided according to embodiments of the first aspect of the present application. Wherein the case has an opening, the electrode assembly is accommodated in the case, the end cap assembly 100 covers the opening, and the terminal plate 212 of the end cap assembly 100 is disposed on one side of the end cap 1 facing away from the interior of the battery cell.

According to the single battery that embodiment of this application second aspect provided, in its end cover assembly 100, on the basis that sets up sealing member 3 between utmost point post 21 and end cover 1, still add one or multichannel seal structure in the one side of deviating from the single battery of end cover 1, flow to the amount that deviates from the single inside one side of single battery and the amount that outside steam permeates into the single battery of end cover 1 after reducing the single inside electrolyte of battery to ooze from the electrode lead-out hole, thereby further reduced the possibility that electrolyte leaked, it is visible, the single battery's that the embodiment of this application second aspect provided sealing performance is better, and the security is higher.

As shown in fig. 2, embodiments of the third aspect of the present application provide a battery 7000 comprising a battery cell 700 provided according to embodiments of the second aspect of the present application.

According to the battery 7000 that the embodiment of this application third aspect provided, in the end cover assembly 100 of its battery cell 700, on the basis that set up sealing member 3 between utmost point post 21 and end cover 1, still add one or more seal structure at the one side of end cover 1 that deviates from the battery cell inside, flow to the amount that deviates from the battery cell inside of end cover 1 and the amount that outside steam permeates into the battery cell inside after reducing the electrolyte that the battery cell inside is oozed out from the electrode extraction hole, thereby further reduced the possibility that electrolyte leaks, it can be seen that the battery cell 700's in the battery 7000 that the embodiment of this application third aspect provided sealing performance is better, and the security is higher.

Embodiments of the fourth aspect of the present application provide an electric device, including a battery cell provided according to embodiments of the second aspect of the present application, the battery cell being configured to provide electric energy.

The electric device can be any one of the aforementioned devices or systems using battery cells.

According to the electric device provided by the embodiment of the fourth aspect of the present application, in the used end cover assembly 100 of the battery cell, on the basis that the sealing member 3 is arranged between the pole 21 and the end cover 1, one or more sealing structures are additionally arranged on one side of the end cover 1 departing from the inside of the battery cell, so as to reduce the amount of electrolyte inside the battery cell which flows to one side of the end cover 1 departing from the inside of the battery cell after seeping out from the electrode leading-out hole and the amount of external water vapor permeating into the inside of the battery cell, thereby further reducing the possibility of electrolyte leakage.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein, but rather to cover all embodiments falling within the scope of the appended claims.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The embodiments of the present application are described in a related manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (18)

1. An end cap assembly (100), comprising:

the end cover (1) is provided with an electrode leading-out hole;

a terminal plate (212) provided on one side of the end cap (1);

a pole (21) which is inserted into the electrode lead-out hole and connected to the terminal plate (212);

a seal (3) disposed at least partially between the pole (21) and the end cap (1);

a spacer (6) at least partially disposed between the terminal plate (212) and the end cap (1) to separate the terminal plate (212) from the end cap (1), and a sealing structure (7) is disposed between the spacer (6) and the end cap (1), and/or a sealing structure (7) is disposed between the spacer (6) and the terminal plate (212).

2. End cap assembly (100) according to claim 1, characterized in that the spacer (6) is provided with a sealing structure (7) which interferes with the end cap (1), and that the part of the side of the spacer (6) facing the end cap (1) where the sealing structure (7) is not provided has a clearance with the end cap (1).

3. End cap assembly (100) according to claim 2, characterized in that the end cap (1) comprises a first region opposite the terminal plate (212), the surface of which facing the partition (6) is planar.

4. The end cap assembly (100) according to claim 1, wherein the separator (6) is provided with a seal structure (7) that interferes with the terminal plate (212), and a portion of a face of the separator (6) facing the terminal plate (212) where the seal structure (7) is not provided has a gap from the terminal plate (212).

5. The end cap assembly (100) according to claim 4, wherein the surface of the terminal plate (212) facing the separator (6) is planar.

6. The end cap assembly (100) of claim 1, wherein the seal structure (7) is a unitary structure with the spacer (6).

7. The end cap assembly (100) according to any one of claims 1 to 6, wherein the sealing structure (7) has a melting point of greater than 150 ℃.

8. End cap assembly (100) according to claim 1, characterized in that the end cap (1) is provided with a sealing structure (7) interfering with the spacer (6).

9. The end cap assembly (100) of claim 8, wherein the seal structure (7) is a unitary structure with the end cap (1).

10. End cap assembly (100) according to claim 1, characterized in that the terminal plate (212) is provided with a sealing structure (7) interfering with the spacer (6).

11. The end cap assembly (100) of claim 10, wherein the seal structure (7) is a unitary structure with the terminal plate (212).

12. The end cap assembly (100) of claim 1, wherein the sealing structure (7) is an annular structure disposed around a perimeter of the electrode lead-out aperture.

13. The end cap assembly (100) of claim 12, wherein the number of the sealing structures (7) is plural, and the plural sealing structures (7) are arranged in a radial direction of the electrode lead-out hole.

14. The end cap assembly (100) according to any one of claims 1 to 6 or 8 to 13, wherein the pole (21) is riveted to the terminal plate (212).

15. End cap assembly (100) according to any of claims 1 to 6 or 8 to 13, characterized in that the end cap assembly (100) further comprises a current collecting member (22), the current collecting member (22) being used to connect the pole (21) and an electrode assembly of a battery cell, the pole (21) being riveted to the current collecting member (22).

16. A battery cell, comprising:

a housing having an opening;

an electrode assembly housed within the case;

end cap assembly (100) according to any of claims 1 to 15, the end cap assembly (100) covering the opening, a terminal plate (212) of the end cap assembly (100) being provided at a side of the end cap (1) facing away from the cell interior.

17. A battery comprising the cell of claim 16.

18. An electric device comprising a cell according to claim 16 for providing electrical energy.

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