Battery cell, battery and electric device

Abstract

Provided in the present application are a battery cell, a battery and an electric device. The battery cell comprises: a casing, an electrode assembly, an end cover assembly and a deformable member, wherein the electrode assembly is arranged in the casing; the end cover assembly closes an opening of the casing in a first direction, and comprises a cover plate and an electrode terminal; the electrode terminal comprises a terminal plate and poles; the terminal plate is configured to electrically connect to an external device; the poles are configured to electrically connect to the electrode assembly; and the terminal plate is electrically connected to at least two poles of the same polarity. The deformable member is connected to the cover plate and can deform to come into contact with the terminal plate, and the deformable member is arranged between at least two poles of the same polarity. Among the battery cell, the battery and the electric device provided in the present application, the battery cell can reduce the probability of poor contact between components during overcharge protection, thereby improving the reliability of the battery cell.

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410840363.X, filed on June 26, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] Energy saving and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0005] In the related art, when the battery cell performs the overcharge protection function, the components used for overcharge protection have the problem of poor contact with each other when working, which affects the reliability of the battery cell.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can reduce the probability of poor contact between components during overcharge protection and improve the reliability of the battery cell.

[0008] In a first aspect, the present application provides a battery cell, comprising a shell, an electrode assembly, an end cover assembly and a deformable member, the electrode assembly is arranged in the shell, the end cover assembly seals an opening of the shell along a first direction, the end cover assembly comprises a cover plate and an electrode terminal, the electrode terminal comprises a terminal plate and a pole, the terminal plate is used for electrically connecting with an external device, the pole is used for electrically connecting with the electrode assembly, and the terminal plate is electrically connected with at least two poles of the same polarity. The deformable member is connected to the cover plate, and the deformable member can be deformed to contact the terminal plate, wherein the deformable member is arranged between the at least two poles of the same polarity.

[0009] In the technical scheme of the embodiment of the application, the battery monomer comprises a shell, an electrode assembly, an end cover assembly and a deformable part, the electrode terminal is electrically connected with the electrode assembly through the pole of the electrode terminal, and the charging and discharging demand of the battery monomer can be ensured. The deformable part is arranged, so that when the battery monomer expands due to overcharging and the like, the deformable part can deform under the action of the expansion pressure and contact the terminal plate to cut off the overcharging circuit. Since the electrode terminal comprises the terminal plate and the at least two poles with the same polarity, the terminal plate is electrically connected with the at least two poles with the same polarity, and the deformable part is arranged between the at least two poles with the same polarity, the strength of the electrode terminal corresponding to the deformable part and the cover plate connection area as a whole can be increased, the anti-deformation capability can be improved, the deformation amount is small when the battery monomer expands due to overcharging, the stability of the contact between the deformable part and the terminal plate after the deformation of the deformable part under the overcharging state of the battery monomer can be ensured, the contact yield can be improved, and the reliability of the battery monomer can be improved.

[0010] In some embodiments, the at least two poles with the same polarity comprise a first pole, and at least one of the first poles is arranged to be electrically connected with the electrode assembly.

[0011] The battery monomer provided by the embodiment of the application is beneficial to ensuring the electrical connection demand between the electrode terminal and the electrode assembly by arranging the at least two poles with the same polarity to comprise the first pole and arranging at least one of the first poles to be electrically connected with the electrode assembly.

[0012] In some embodiments, the at least two poles with the same polarity are arranged to be riveted to the terminal plate and the cover plate.

[0013] The battery monomer provided by the embodiment of the application can ensure the connection strength between the terminal plate and the cover plate and improve the anti-deformation capability by arranging the at least two poles with the same polarity to be riveted to the terminal plate and the cover plate. Meanwhile, the assembly efficiency between the poles, the terminal plate and the cover plate can be improved.

[0014] In some embodiments, the battery monomer comprises two electrode terminals with opposite polarities.

[0015] In some embodiments, the poles have the same structure.

[0016] The battery monomer provided by the embodiment of the application can reduce the expansion deformation of the battery monomer when overcharging, and the probability of triggering failure of the overcharge deformable part due to displacement of the poles. Moreover, the poles can be mass-produced, and the production cost and assembly difficulty can be reduced.

[0017] In some embodiments, the first pole is arranged to be close to the middle region of the cover plate in the second direction.

[0018] The battery cell provided by one embodiment of the present application can adapt to the setting position of the tab of the electrode assembly through the above setting, and ensure the electrical connection requirement with the electrode assembly.

[0019] In some embodiments, the end cover assembly further comprises a first insulating piece, the first insulating piece comprises a first recess, the at least two pole posts with the same polarity comprise a second pole post, the second pole post is arranged away from the middle region of the cover plate along the second direction, the second pole post is arranged corresponding to the first recess of the first insulating piece, and the first recess is arranged to electrically isolate the electrode assembly from the second pole post.

[0020] The battery cell provided by one embodiment of the present application can separate the cover plate from the electrode assembly by the first insulating piece, avoid short circuit and other phenomena caused by contact between the two, and ensure the reliability of the battery cell. The first recess can avoid the insertion of the second pole post on the terminal plate and the cover plate, and the bottom and the sidewall of the first recess can also protect the second pole post, so as to realize the insulation between the second pole post and the electrode assembly and reduce the risk of short circuit.

[0021] In some embodiments, the second pole post is arranged to extend into the first recess.

[0022] The battery cell provided by one embodiment of the present application can accommodate the second pole post by the recess cavity of the first recess, ensure the extension length requirement of the second pole post and the connection requirement of the cover plate and the terminal plate, and the above setting can also provide positioning and reliable protection for the assembly of the second pole post, so as to electrically isolate the second pole post from the electrode assembly.

[0023] In some embodiments, the first insulating piece comprises a second recess, the second recess is arranged on the side of the deformable piece close to the electrode assembly, and the second recess is provided with a communication hole in communication with the cavity in the shell.

[0024] The battery cell provided by one embodiment of the present application can accommodate the deformable piece by the second recess, ensure the thickness requirement of the deformable piece, and protect the deformable piece by the first insulating piece to avoid contact and short circuit between the deformable piece and the electrode assembly in the normal working state of the battery cell, thereby improving the reliability of the battery cell. Meanwhile, the arrangement of the communication hole enables the gas generated in the overcharge of the battery cell to flow to the deformable piece through the communication hole, push the deformable piece to deform and contact the terminal plate, and meet the implementation of the overcharge protection function.

[0025] In some embodiments, the end cover assembly further comprises a second insulating piece, and the second insulating piece is arranged between the terminal plate and the cover plate.

[0026] The battery cell provided by one embodiment of the present application can insulate the terminal plate and the cover plate by the second insulating piece, thereby improving the reliability of the battery cell.

[0027] In some embodiments, the pole includes a first riveting portion configured to be connected with the terminal plate, and a second riveting portion configured to be connected with the cover plate.

[0028] According to the battery monomer provided in an embodiment of the present application, the first riveting portion and the second riveting portion are used to clamp and fix the cover plate and the terminal plate, so that the connection strength between the cover plate and the terminal plate is ensured, the integrity of the end cover assembly is improved, and the connection stability and strength are improved.

[0029] In some embodiments, the battery monomer includes two electrode terminals with opposite polarities, and the electrode terminals include two poles with the same polarity, and the deformable member is arranged between the two poles with the same polarity.

[0030] According to the battery monomer provided in an embodiment of the present application, the above-mentioned arrangement is conducive to meeting the charging and discharging requirements of the battery monomer, and conducive to ensuring the stable contact between the components, thereby ensuring the reliability of the battery monomer itself.

[0031] In a second aspect, the present application provides a battery including the battery monomer described above.

[0032] In a third aspect, the present application provides a power consumption device including the battery described above.

[0033] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be implemented more clearly according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings:

[0035] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0036] FIG. 2 is a structural schematic diagram of a battery according to an embodiment of the present application;

[0037] FIG. 3 is an exploded structural schematic diagram of a battery monomer according to an embodiment of the present application;

[0038] FIG. 4 is an isometric view of an end cover assembly of a battery monomer according to an embodiment of the present application;

[0039] Fig. 5 is a top view of an end cover assembly of a battery cell according to an embodiment of the present application;

[0040] Fig. 6 is a sectional view of Fig. 5 along the direction of A-A;

[0041] Fig. 7 is an enlarged view of a portion of Fig. 6 at B;

[0042] Fig. 8 is a structural schematic view of an end cover assembly of a battery cell according to another embodiment of the present application;

[0043] Fig. 9 is a structural schematic view of an end cover assembly of a battery cell according to still another embodiment of the present application;

[0044] Fig. 10 is a structural schematic view of an energy storage device according to an embodiment of the present application.

[0045] Label description: 1, vehicle; 100, battery; 300, controller; 400, motor; 200, battery module; 2, energy storage device; 201, control box; 202, battery cluster; 10, box body; 11, first box body part; 12, second box body part; 20, battery cell; 21, shell; 211, opening; 22, electrode assembly; 23, end cover assembly; 231, cover plate; 232, electrode terminal; 2321, terminal plate; 2322, pole; 23221, first pole; 23222, second pole; 2322a, main body part; 2322b, first riveting part; 2322c, second riveting part; 233, first insulating part; 2331, first recess; 2332, first through hole; 2333, communication hole; 2334, second recess; 234, second insulating part; 24, deformable part; 25, adapter piece; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0046] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0047] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meanings understood by the skilled in the art to which the embodiments of the present application belong.

[0048] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0049] In addition, the technical terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0050] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0052] At present, from the development of market situation, the application of secondary batteries is more and more widely. Secondary batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind and solar power stations, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of secondary batteries, the market demand is also increasing.

[0053] The battery monomer can exist overcharge problem in use, in order to alleviate the influence of overcharge problem on the reliability of battery monomer, the deformable part is arranged, when the battery monomer is in overcharge condition, the deformable part is contacted with electrode terminal, the positive and negative short circuit loop is formed and the large current is generated, the fuse in the loop is fused in a short time, and the overcharge loop is cut off in time.In related technology, when the battery monomer executes overcharge protection function, the deformable part and the electrode terminal of the end cover assembly are in the risk of poor contact, which affects the reliability of the battery monomer.Further research shows that the battery monomer is easy to expand deformation in the case of overcharge, and in the process of expansion deformation of the battery monomer, when the deformable part is contacted with the electrode terminal under the overcharge condition, due to the expansion deformation of the battery monomer, the risk of poor contact or contact failure exists between the two, the overcharge loop cannot be cut off in time, and the reliability of the battery monomer during charging is affected.

[0054] In order to alleviate the problem of poor contact between the deformable part and the electrode terminal of the battery monomer under overcharge condition, it is found that the influence of battery monomer deformation on the contact between the deformable part and the electrode terminal can be alleviated, and the reliability of the battery monomer is improved.

[0055] Based on the above consideration, in order to solve the problem of poor contact between the deformable part and the electrode terminal of the battery monomer under overcharge condition, after deep research, a kind of battery monomer is designed, which comprises a shell, an electrode assembly, an end cover assembly and a deformable part, the electrode assembly is arranged in the shell, the end cover assembly seals the opening of the shell along the first direction, the end cover assembly comprises a cover plate and an electrode terminal, the electrode terminal comprises a terminal plate and a pole, the terminal plate is used for electrically connecting with external equipment, the pole is used for electrically connecting with the electrode assembly, and the terminal plate is electrically connected with at least two poles with the same polarity.The deformable part is connected to the cover plate, and the deformable part can be deformed to contact with the terminal plate, wherein the deformable part is arranged between the at least two poles with the same polarity.

[0056] In the technical scheme of the embodiment of the application, the pole of the electrode terminal is electrically connected with the electrode assembly, which can ensure the charging and discharging demand of the battery monomer.The arrangement of the deformable part enables the deformable part to deform and contact with the terminal plate under the action of expansion pressure when the battery monomer expands due to overcharge and the like, so as to cut off the overcharge loop.Because the electrode terminal comprises a terminal plate and a pole, the terminal plate is electrically connected with at least two poles with the same polarity, and the deformable part is arranged between the at least two poles with the same polarity, the strength of the whole connection area of the deformable part corresponding electrode terminal and the cover plate can be increased, the anti-deformation ability is improved, the deformation amount is small when the battery monomer expands due to overcharge, the stability of the contact between the deformable part and the terminal plate after the deformation of the battery monomer under overcharge condition is ensured, the contact yield is improved, and the reliability of the battery monomer is improved.The technical scheme described in the embodiment of the application is suitable for battery and electric device using battery.

[0057] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The electric device can be an energy storage device, which can be applied in small and medium industrial and commercial energy storage scenarios, large industrial and commercial energy storage scenarios, optical energy storage charging stations, and small and medium micro-grid industrial and commercial energy storage scenarios, as well as wind and light energy storage power stations, power grid energy storage power stations, and large micro-grid power station scenarios, for storing and releasing electric energy.

[0058] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described batteries and electric devices, but can also be applied to all batteries including a box body and electric devices using the batteries. However, for the sake of brevity of description, the following embodiments are described by taking an electric vehicle as an example.

[0059] For example, as shown in FIG. 1, which is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application, the vehicle 1 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle. The vehicle 1 can be provided with a motor 400, a controller 300, and a battery 100 inside. The controller 300 is used to control the battery 100 to supply power to the motor 400. For example, the battery 100 can be arranged at the bottom, the front, or the rear of the vehicle 1. The battery 100 can be used to supply power to the vehicle 1. For example, the battery 100 can be used as an operating power source of the vehicle 1, which is used for the circuit system of the vehicle 1, such as the power demand for starting, navigation, and working of the vehicle 1. In another embodiment of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, which replaces or partially replaces fuel or natural gas to provide driving power for the vehicle 1.

[0060] As shown in FIG. 2 and FIG. 3, which are a structural schematic diagram of the battery 100 according to an embodiment of the present application and an exploded structural schematic diagram of a battery monomer 20 according to an embodiment of the present application.

[0061] In order to meet different power demands, the battery 100 can include a plurality of battery monomers 20, which can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series connection and parallel connection. The battery 100 can also be referred to as a battery 100 pack. Alternatively, the plurality of battery monomers 20 can be connected in series, in parallel, or in a mixed connection to form a battery module 200, and the plurality of battery modules 200 can be connected in series, in parallel, or in a mixed connection to form the battery 100. That is, the plurality of battery monomers 20 can be directly connected to form the battery 100, or the plurality of battery monomers 20 can be connected to form the battery module 200, and the battery module 200 can be connected to form the battery 100.

[0062] For example, as shown in FIG. 2, a structural schematic diagram of a battery 100 according to an embodiment of the present application can include a plurality of battery cells 20. The battery 100 can also include a box 10 (or cover body), which is hollow inside and in which the plurality of battery cells 20 are accommodated.

[0063] The box 10 can be a simple cuboid or cylinder or sphere structure, or a complex structure composed of simple cuboid or cylinder or sphere structures, and the embodiments of the present application are not limited in this regard. The material of the box 10 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application are not limited in this regard.

[0064] The box 10 is used to accommodate the battery cells 20, and the box 10 can have various structures. In some embodiments, the box 10 can include a first box part 11 and a second box part 12, the first box part 11 and the second box part 12 are covered with each other, and the first box part 11 and the second box part 12 together define an accommodation space for accommodating the battery cells 20. The second box part 12 can be a hollow structure with an open end 211, and the first box part 11 is a plate structure, which is covered on the open end 211 side of the second box part 12 to form the box 10 with the accommodation space; the first box part 11 and the second box part 12 can also be hollow structures with an open end 211, and the open end 211 side of the first box part 11 is covered on the open end 211 side of the second box part 12 to form the box 10 with the accommodation space. Of course, the first box part 11 and the second box part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0065] To improve the sealing performance of the first box part 11 and the second box part 12 after being connected, a sealing member such as sealing glue or a sealing ring can be arranged between the first box part 11 and the second box part 12.

[0066] Suppose that the first box part 11 is covered on the top of the second box part 12, the first box part 11 can also be referred to as an upper box cover, and the second box part 12 can also be referred to as a lower box 10.

[0067] In the battery 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is accommodated in the box 10. Of course, the multiple battery cells 20 can be first connected in series, in parallel or in a mixed manner to form a battery module 200, and then the multiple battery modules 200 are connected in series, in parallel or in a mixed manner to form a whole and are accommodated in the box 10.

[0068] In some embodiments, as shown in FIG. 2, the battery cell 20 is multiple, and the multiple battery cells 20 are first connected in series, in parallel or in a mixed manner to form a battery module 200. Then the multiple battery modules 200 are connected in series, in parallel or in a mixed manner to form a whole and are accommodated in the box 10.

[0069] The multiple battery cells 20 in the battery module 200 can be electrically connected through a busbar component to realize parallel connection, series connection or mixed connection of the multiple battery cells 20 in the battery module 200.

[0070] In this application, the battery cell 20 can include a lithium ion battery cell 20, a sodium ion battery cell 20 or a magnesium ion battery cell 20, etc. The embodiments of this application are not limited in this regard. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of this application are not limited in this regard. The battery cell 20 is generally divided into three types according to the packaging method: cylindrical battery cell 20, square battery cell 20 and soft package battery cell 20, etc. The embodiments of this application are not limited in this regard. However, for the sake of simplicity, the following embodiments will be described taking the square battery cell 20 as an example.

[0071] As shown in FIGS. 3 to 7, FIG. 3 is an exploded structural view of a battery cell 20 according to an embodiment of the application; FIG. 4 is an axonometric view of an end cover assembly 23 of the battery cell 20 according to an embodiment of the application; FIG. 5 is a top view of the end cover assembly 23 of the battery cell 20 according to an embodiment of the application; FIG. 6 is a sectional view along the direction A-A of FIG. 5; and FIG. 7 is an enlarged view of a part B in FIG. 6.

[0072] The battery cell 20 provided by one embodiment of the present application includes a shell 21, an electrode assembly 22, an end cover assembly 23, and a deformable member 24. The electrode assembly 22 is arranged in the shell 21. The end cover assembly 23 seals an opening 211 of the shell 21 along a first direction X. The end cover assembly 23 includes a cover plate 231 and an electrode terminal 232. The electrode terminal 232 includes a terminal plate 2321 and a pole 2322. The terminal plate 2321 is configured to electrically connect with an external device. The pole 2322 is configured to electrically connect with the electrode assembly 22. The terminal plate 2321 is electrically connected with at least two poles 2322 having the same polarity. The deformable member 24 is connected to the cover plate 231. The deformable member 24 can be deformed to contact the terminal plate 2321. The deformable member 24 is arranged between the at least two poles 2322 having the same polarity.

[0073] The shell 21 can have various shapes and sizes, such as a cuboid shape, a cylindrical shape, a hexagonal prism shape, etc. In particular, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 22. The shell 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special limitations on this.

[0074] The electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20. The shell 21 can contain one or more electrode assemblies 22.

[0075] The electrode assembly 22 can include first and second polar plates having opposite polarities and a separator. The first and second polar plates and the separator can be wound in a winding direction to form a wound structure, or can be stacked to form a stacked structure.

[0076] One of the first and second polar plates can be a positive polar plate, and the other can be a negative polar plate. The first and second polar plates can have the same structure, and the second polar plate can also be a polar plate including a current collector and an active material layer in a conventional arrangement.

[0077] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. The separator can be clamped between the first and second polar plates to insulate the first and second polar plates from each other.

[0078] The end cover assembly 23 refers to a component that is combined with the opening 211 of the shell 21 to form a containing cavity for containing the electrode assembly 22, and the end cover assembly 23 isolates the internal environment of the battery monomer 20 from the external environment. Without limitation, the shape of the end cover assembly 23 can be adapted to the shape of the shell 21 to fit the shell 21. Alternatively, the end cover assembly 23 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover assembly 23 is not easy to deform when subjected to extrusion collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved.

[0079] The cover plate 231 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the cover plate 231 is not easy to deform when subjected to extrusion collision, so that the battery monomer 20 can have higher structural strength, and the safety performance can also be improved. The material of the cover plate 231 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application embodiment does not make special limitation.

[0080] The electrode terminal 232 is provided on the cover plate 231 and is electrically connected with the electrode assembly 22, and can be electrically connected through the adapter sheet 25. In the battery monomer 20, the electrode terminal 232 is used to connect with the bus component to realize the electrical connection between multiple battery monomers 20.

[0081] The number of the electrode terminal 232 provided on the cover plate 231 can be one or two, and when it is two, the polarity of the two electrode terminals 232 can be opposite.

[0082] The terminal plate 2321 of the electrode terminal 232 can be connected with the cover plate 231 by welding or fastening. In some optional embodiments, the terminal plate 2321 and the cover plate 231 can be insulated. Alternatively, the terminal plate 2321 and the cover plate 231 can be riveted through the pole 2322.

[0083] The poles 2322 with the same polarity can be understood as each pole 2322 that is directly or indirectly electrically connected with the positive or negative lug of the electrode assembly 22.

[0084] The number of the pole posts 2322 of the same polarity can be two, three or more, which can be determined according to the strength requirement and specification requirement of the electrode terminal 232. The pole posts 2322 of the same polarity can be electrically connected to the electrode assembly 22, directly or indirectly through the adapter piece 25. Of course, in some embodiments, two or more of the pole posts 2322 of the same polarity or all of the pole posts 2322 can be electrically connected to the electrode assembly 22 to increase the overcurrent area.

[0085] The radial dimensions of the pole posts 2322 of the same polarity can be equal, of course, there can be differences, such as differences in radial dimensions, differences in materials, etc.

[0086] The deformable member 24 can be a conductive piece, which can be a copper conductive piece, an aluminum conductive piece or other metal conductive piece, etc.

[0087] The external device includes but is not limited to busbars, connection bars, etc.

[0088] The deformable member 24 and the electrode terminal 232 have two states. When the battery monomer 20 is working normally, the deformable member 24 is arranged separately from the terminal plate 2321 of the electrode terminal 232, and the battery monomer 20 can normally charge and discharge. When the battery monomer 20 is overcharged and expands, the deformable member 24 moves under the action of overcharge pressure, so that it can at least partially move to the side where the electrode terminal 232 is located. The deformable member 24 is in contact with the terminal plate 2321 of the electrode terminal 232, so that the electrode terminals 232 of opposite polarity are electrically connected to form a short circuit loop, the instantaneous current in the loop increases, and the structure such as the adapter piece 25 connecting the electrode assembly 22 and the electrode terminal 232 is melted to cut off the overcharge loop.

[0089] The first direction X can be the height direction of the shell 21, or the height direction of the electrode assembly 22. The shell 21 can be provided with an opening 211 on one side in the first direction X, of course, the openings 211 can also be provided on both sides in the first direction X.

[0090] In some embodiments, the battery monomer 20 can include a pressure relief mechanism for releasing the pressure inside the battery monomer 20 when the internal pressure or temperature of the battery monomer 20 reaches a predetermined value.

[0091] For example, the pressure relief mechanism can be a component such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure relief valve or a safety valve, etc.

[0092] In the technical scheme of the embodiment of the present application, the battery monomer 20 comprises a shell 21, an electrode assembly 22, an end cover assembly 23 and a deformable part 24, the pole column 2322 of the electrode terminal 232 is electrically connected with the electrode assembly 22, and the charging and discharging demand of the battery monomer 20 can be ensured. The setting of the deformable part 24 enables the deformable part 24 to deform under the action of the expansion pressure and contact the terminal plate 2321 when the battery monomer 20 expands due to overcharging and the like, so as to cut off the overcharging circuit. Since the electrode terminal 232 comprises the terminal plate 2321 and the pole column 2322, the terminal plate 2321 is electrically connected with at least two pole columns 2322 of the same polarity, and the deformable part 24 is arranged between the at least two pole columns 2322 of the same polarity, the strength of the whole area where the deformable part 24 corresponds to the electrode terminal 232 and the cover plate 231 can be increased, the anti-deformation capability is improved, the deformation amount is small when the battery monomer 20 expands due to overcharging, the stability of the contact between the deformable part 24 and the terminal plate 2321 after the deformation of the deformable part 24 under the overcharging state of the battery monomer 20 is ensured, the contact yield is improved, and the reliability of the battery monomer 20 is further improved.

[0093] In some optional embodiments, the battery monomer 20 provided by an embodiment of the present application, the at least two pole columns 2322 of the same polarity comprise a first pole column 23221, and at least one of the first pole columns 23221 is arranged to be electrically connected with the electrode assembly 22.

[0094] The at least two pole columns 2322 of the same polarity can comprise one first pole column 23221 or more than two first pole columns 23221. Only one first pole column 23221 in the at least two pole columns 2322 of the same polarity can be electrically connected with the electrode assembly 22, or more than two first pole columns 23221 can be electrically connected with the electrode assembly 22. The first pole column 23221 and the electrode assembly 22 can be electrically connected by using a structure such as a jumper 25. The jumper 25, the first pole column 23221 and the electrode assembly 22 can be connected by using welding or the like. Optionally, the jumper 25 can be provided with a fuse part, when the deformable part 24 deforms and contacts the terminal plate 2321 due to overcharging of the battery monomer 20, the fuse part can be fused to effectively cut off the overcharging circuit.

[0095] The battery monomer 20 provided by an embodiment of the present application, by arranging the at least two pole columns 2322 of the same polarity to comprise the first pole column 23221 and arranging at least one of the first pole columns 23221 to be electrically connected with the electrode assembly 22, the electrical connection demand between the electrode terminal 232 and the electrode assembly 22 can be ensured.

[0096] In some optional embodiments, the battery monomer 20 provided by an embodiment of the present application, the at least two pole columns 2322 of the same polarity are arranged to be riveted with the terminal plate 2321 and the cover plate 231.

[0097] The two of the plurality of poles 2322 with the same polarity can be riveted to the terminal plate 2321 and the cover plate 231, and of course, each of the plurality of poles 2322 with the same polarity can be riveted to the terminal plate 2321 and the cover plate 231.

[0098] The battery monomer 20 provided by the embodiment of the present application can ensure the connection strength between the terminal plate 2321 and the cover plate 231 and improve the deformation resistance by setting at least two poles 2322 with the same polarity to be riveted to the terminal plate 2321 and the cover plate 231. Meanwhile, the assembly efficiency between the pole 2322, the terminal plate 2321 and the cover plate 231 can be improved.

[0099] In some optional embodiments, the battery monomer 20 includes two electrode terminals 232 with opposite polarities.

[0100] The deformable member 24 can be arranged corresponding to one of the electrode terminals 232, and the deformable member 24 can be arranged corresponding to each of the electrode terminals 232. The deformable member 24 can be arranged one by one with the electrode terminal 232, and the two electrode terminals 232 can be located on the same cover plate 231. When the two electrode terminals 232 are located on the same cover plate 231, the corresponding deformable member 24 can also be located on the same cover plate 231, and the deformable member 24 can be electrically connected with the cover plate 231. When the battery monomer 20 is overcharged, the deformable members 24 arranged in pairs are deformed and contact the corresponding electrode terminals 232, so that the electrode terminals 232 arranged in pairs are electrically connected through the deformable members 24 and the cover plate 231, and the overcharge circuit is cut off in time.

[0101] Of course, in some embodiments, the electrode terminals 232 arranged in pairs can be located on different cover plates 231, and the deformable members 24 can be arranged on different cover plates 231. The specific arrangement can be set according to the model and structure requirements of the battery monomer 20.

[0102] When the electrode terminals 232 are two, each of the electrode terminals 232 can include a plurality of poles 2322 to ensure the stability of the contact with the corresponding deformable member 24.

[0103] The battery monomer 20 provided by the embodiment of the present application can meet the charging and discharging requirements of the battery monomer 20, and can ensure the stable contact between the components and the reliability of the battery monomer 20.

[0104] In some optional embodiments, the structure of the pole 2322 is the same.

[0105] The structure of the poles 2322 with the same polarity can be the same, and the structure of the poles 2322 with different polarities can be the same.

[0106] The same structure of the poles 2322 can mean the same height size, the same radial size, the same material, and the like.

[0107] The battery monomer 20 provided in an embodiment of the present application can reduce the probability of triggering failure of the deformable part 24 caused by displacement of the poles 2322 due to swelling and deformation of the battery monomer 20 during overcharging, and can ensure mass production of the poles 2322 and reduce production cost and assembly difficulty.

[0108] In some optional embodiments, the first pole 23221 is arranged close to the middle region of the cover plate 231 in the second direction Y.

[0109] The second direction Y can be the length direction of the battery monomer 20 or the end cover assembly 23. The second direction Y intersects the first direction X, and can be perpendicular to the first direction X.

[0110] The battery monomer 20 can have a central axis in the first direction X, and the central axis is located in the middle region. The first pole 23221 is closer to the middle region than the other poles 2322, or the vertical distance between the first pole 23221 and the central axis in the second direction Y is smaller than that between the other poles 2322 and the central axis.

[0111] The battery monomer 20 provided in an embodiment of the present application can adapt to the arrangement position of the tab of the electrode assembly 22 and ensure the electrical connection requirement of the electrode assembly 22.

[0112] As shown in FIGS. 8 and 9, FIG. 8 is a structural schematic diagram of an end cover assembly of a battery monomer according to another embodiment of the present application, and FIG. 9 is a structural schematic diagram of an end cover assembly of a battery monomer according to another embodiment of the present application.

[0113] In some optional embodiments, the battery monomer 20 provided in an embodiment of the present application further includes a first insulating part 233, the first insulating part 233 includes a first recess 2331, the at least two poles 2322 with the same polarity include a second pole 23222, the second pole 23222 is arranged away from the middle region of the cover plate 231 in the second direction Y, the second pole 23222 is arranged corresponding to the first recess 2331 of the first insulating part 233, and the first recess 2331 is arranged to electrically isolate the electrode assembly 22 from the second pole 23222.

[0114] The first insulating part 233 and the cover plate 231 can be arranged in a stack and connected.

[0115] The first insulating member 233 can be formed by injection molding. The first recess 2331 has a cavity, and the second pole 2322 can extend into the cavity of the first recess 2331. Each first recess 2331 can accommodate one second pole 2322. Of course, when the number of second poles 2322 is large, each first recess 2331 can accommodate more than two second poles 2322.

[0116] The first recess 2331 can have a circular, elliptical or polygonal shape in the orthographic projection in the first direction X. The shape can be determined according to the shape of the second pole 2322.

[0117] The battery monomer 20 provided by the embodiment of the present application can separate the cover plate 231 from the electrode assembly 22 by the first insulating member 233, so as to avoid short circuit caused by contact between the cover plate 231 and the electrode assembly 22, and ensure the reliability of the battery monomer 20. The first recess 2331 can avoid the insertion of the second pole 2322 into the terminal plate 2321 and the cover plate 231. In addition, the bottom and the sidewall of the first recess 2331 can also protect the second pole 2322, so as to insulate the second pole 2322 from the electrode assembly 22 and reduce the risk of short circuit.

[0118] In some optional embodiments, the second pole 2322 of the battery monomer 20 provided by the embodiment of the present application extends into the first recess 2331.

[0119] The number of first recesses 2331 can be one or more, which can be determined according to the number of second poles 2322.

[0120] Each first recess 2331 can be arranged corresponding to one of the second poles 2322 and match the shape of the end of the second pole 2322 facing the electrode assembly 22. The insertion of the second pole 2322 into the first recess 2331 can abut against at least one of the bottom wall and the sidewall of the first recess 2331.

[0121] The battery monomer 20 provided by the embodiment of the present application can accommodate the second pole 2322 in the cavity of the first recess 2331, so as to ensure the extension length of the second pole 2322 and the connection of the cover plate 231 and the terminal plate 2321. In addition, the above arrangement can also provide positioning and reliable protection for the assembly of the second pole 2322, so as to electrically isolate the second pole 2322 from the electrode assembly 22.

[0122] As shown in FIG. 8 and FIG. 9, in some optional embodiments, the battery monomer 20 provided by an embodiment of the present application includes the first insulation member 233, and the first insulation member 233 includes the second recess 2334. The second recess 2334 is arranged on the side of the deformable member 24 close to the electrode assembly 22, and the second recess 2334 is provided with the communication hole 2333 in communication with the cavity in the shell 21.

[0123] The number of the communication hole 2333 can be one or multiple. When the number of the communication hole 2333 is multiple, the multiple communication holes 2333 can be arranged at intervals around the deformable member.

[0124] The battery monomer 20 provided by an embodiment of the present application can accommodate the deformable member 24 through the second recess 2334, ensure the thickness requirement of the deformable member 24, and protect the deformable member 24 through the first insulation member 233, so as to avoid the contact and short circuit of the deformable member 24 and the electrode assembly 22 in the normal working state of the battery monomer 20, and improve the reliability of the battery monomer 20. Meanwhile, the arrangement of the communication hole 2333 enables the gas generated in the overcharge of the battery monomer 20 to flow to the deformable member 24 through the communication hole 2333, push the deformable member 24 to deform and contact the terminal plate 2321, and meet the implementation of the overcharge protection function.

[0125] As shown in FIG. 4 to FIG. 9, in some optional embodiments, the end cover assembly 23 further includes the second insulation member 234, and the second insulation member 234 is arranged between the terminal plate 2321 and the cover plate 231.

[0126] The second insulation member 234 can be provided with the insertion hole corresponding to each pole 2322, and each pole 2322 can pass through the insertion hole.

[0127] The battery monomer 20 provided by an embodiment of the present application can ensure the insulation connection requirement between the electrode terminal 232 and the cover plate 231, and avoid the influence of the second insulation member 234 on the contact between the deformable member 24 and the terminal plate 2321, and ensure the overcharge protection requirement.

[0128] As shown in FIG. 6 to FIG. 9, in some optional embodiments, the battery monomer 20 provided by an embodiment of the present application includes the pole 2322, and the pole 2322 includes the first riveting part 2322b and the second riveting part 2322c. The first riveting part 2322b is arranged to be connected with the terminal plate 2321, and the second riveting part 2322c is arranged on the side of the cover plate 231 close to the electrode assembly 22, and the second riveting part 2322c is arranged to be clamped with the cover plate 231.

[0129] Optionally, the pole column 2322 further comprises a main body part 2322a, and the first riveting part 2322b and the second riveting part 2322c are arranged at two ends of the main body part 2322a along the first direction X. The radial dimension of the first riveting part 2322b and the radial dimension of the second riveting part 2322c are both greater than the radial dimension of the main body part 2322a. The first riveting part 2322b and the second riveting part 2322c are both arranged protruding from the outer periphery of the main body part 2322a.

[0130] When the first insulating part 233 and the second insulating part 234 are included, the main body part 2322a further passes through at least the second insulating part 234.

[0131] The battery monomer 20 provided by an embodiment of the present application can clamp and fix the cover plate 231 and the terminal plate 2321 through the first riveting part 2322b and the second riveting part 2322c, ensure the connection strength between the two, improve the integrity of the end cover assembly 23, and facilitate stable connection and strength improvement.

[0132] In some optional embodiments, the battery monomer 20 comprises two electrode terminals 232 of opposite polarities, and the electrode terminal 232 comprises two pole columns 2322 of the same polarity, and the deformable part 24 is arranged between the two pole columns 2322 of the same polarity.

[0133] The battery monomer 20 provided by an embodiment of the present application can meet the charging and discharging requirements of the battery monomer 20 through the above arrangement, while facilitating stable contact between components and further ensuring the reliability of the battery monomer 20 itself.

[0134] Optionally, along the first direction X, the orthographic projection of the plurality of pole columns 2322 of the same electrode terminal 232 is arranged around the orthographic projection of the deformable part 24.

[0135] Each electrode terminal 232 is correspondingly provided with a deformable part 24. The plurality of pole columns 2322 of the same electrode terminal 232 are arranged at intervals around the correspondingly arranged deformable part 24. The plurality of pole columns 2322 can be arranged at intervals in the outer periphery of the deformable part 24, each pole column 2322 can be inserted into the terminal plate 2321 and the cover plate 231 along the first direction X and connect and fix the two, and the pole column 2322 can be insulated from the cover plate 231, for example, through the arrangement of an insulating sleeve or the like.

[0136] The battery monomer 20 provided by one embodiment of the present application is configured such that the orthogonal projections of the plurality of poles 2322 of the same electrode terminal 232 are arranged around the orthogonal projection of the deformable member 24, so that when the battery monomer 20 is overcharged and swells, the deformation amount of the overall structure formed by the electrode terminal 232 and the cover plate 231 at the position of the outer periphery of the deformable member 24 is reduced, and the good contact between the deformable member 24 and the terminal plate 2321 when the deformable member 24 is deformed under pressure is ensured.

[0137] In some optional embodiments, the battery monomer 20 provided by one embodiment of the present application is configured such that the vertical distances from the orthogonal projection of the plurality of poles 2322 of the same electrode terminal 232 to the orthogonal projection of the deformable member 24 are equal in the first direction X.

[0138] The vertical distance can be understood as the minimum vertical distance between the center of the orthogonal projection of each pole 2322 in the first direction X and the center of the orthogonal projection of the deformable member 24.

[0139] The battery monomer 20 provided by one embodiment of the present application is configured such that the vertical distances from the orthogonal projection of the plurality of poles 2322 of the same electrode terminal 232 to the orthogonal projection of the deformable member 24 are equal. This can ensure that the plurality of poles 2322 of the electrode terminal 232 are arranged at intervals and uniformly around the outer periphery of the deformable member 24, which can improve the uniformity of the strength of the overall structure formed by the electrode terminal 232 and the cover plate 231 at the outer periphery of the deformable member 24, so that when the battery monomer 20 swells, the deformation of the terminal plate 2321 and the corresponding region of the deformable member 24 is uniform and the deformation amount is small, and the probability of triggering failure of the overcharge deformable member 24 due to displacement of the poles 2322 when the battery monomer 20 swells due to overcharging can be reduced.

[0140] As shown in FIGS. 3-9, the battery cell 20 provided by one embodiment of the present application includes a shell 21, an electrode assembly 22, an end cover assembly 23, a deformable member 24, and a transition piece 25. The shell 21 can adopt a square shell 21, and the shell 21 is provided with an opening 211 on one side in the first direction X. The electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 can adopt a winding structure, and the number of electrode assemblies 22 can be two. The end cover assembly 23 closes the opening 211 of the shell 21 in the first direction X, and the end cover assembly 23 includes a cover plate 231, an electrode terminal 232, a first insulating member 233, and a second insulating member 234, the terminal plate 2321 is arranged on the cover plate 231, the second insulating member 234 is arranged between the terminal plate 2321 and the cover plate 231 of each electrode assembly 22, and the first insulating member 233 is arranged on the side of the cover plate 231 facing the electrode assembly 22. The pole post 2322 includes a main body part 2322a, a first riveting part 2322b, and a second riveting part 2322c, the first riveting part 2322b and the second riveting part 2322c are arranged at both ends of the main body part 2322a in the first direction X, the main body part 2322a is inserted into the terminal plate 2321, the second insulating member 234, and the cover plate 231, and the terminal plate 2321 and the cover plate 231 are partially clamped between the first riveting part 2322b and the second riveting part 2322c. The deformable member 24 can adopt the form of a deformable sheet, the number of deformable members 24 is the same as the number of electrode terminals 232 and is arranged on the same cover plate 231, the deformable member 24 is arranged one-to-one with the electrode terminal 232, the deformable member 24 and the cover plate 231 can be connected by welding or the like, the deformable member 24 can deform and contact the terminal plate 2321 under a predetermined pressure, and specifically, the deformable member 24 can flip in the direction away from the electrode assembly 22 in the first direction X and contact and electrically connect with the terminal plate 2321 under the action of the overcharge gas pressure of the battery 100. The number of pole posts 2322 included in the electrode terminal 232 is two, one of which is a first pole post 23221 electrically connected with the electrode assembly 22, and specifically can be electrically connected with the tab of the electrode assembly 22. In the first direction X, the orthographic projection of the two pole posts 2322 with the same polarity is arranged around the orthographic projection of the deformable member 24. Alternatively, the two pole posts 2322 with the same polarity are the same in structure and symmetrically distributed on both sides of the corresponding deformable member 24, and can be symmetrically distributed on both sides of the deformable member 24 in the length direction of the battery cell 20. One of the two pole posts 2322 with the same polarity is the first pole post 23221 and is connected with the tab of the electrode assembly 22 through the transition piece 25, and the other is the second pole post 23222 and is covered by the first insulating member 233 in the first direction X to be insulated from the electrode assembly 22.The first insulating piece 233 is provided with a first recess 2331 and a second recess 2334, the second pole 23222 is arranged in correspondence with the first recess 2331 of the first insulating piece 233, the first recess 2331 is arranged to electrically isolate the electrode assembly 22 from the second pole 2322, and the second recess 2334 is arranged on the side of the deformable piece 24 close to the electrode assembly 22, the second recess 2334 is provided with a communication hole 2333 in communication with the cavity in the shell 21, and the second insulating piece 234 is arranged between the terminal plate 2321 and the cover plate 231.

[0141] In another aspect, an embodiment of the present application further provides a battery 100 comprising the battery monomer 20 provided by the above embodiments.

[0142] In another aspect, an embodiment of the present application further provides a battery 100 comprising the battery monomer 20 provided by the above embodiments.

[0143] In another aspect, an embodiment of the present application further provides a battery 100 comprising the battery monomer 20 provided by the above embodiments.

[0144] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above vehicle 1, but can also be applied to the energy storage device 2.

[0145] For example, as shown in FIG. 10, the energy storage device 2 refers to a device for temporarily or permanently storing energy, and the energy storage device 2 can include a control box 201 and a battery cluster 202, the battery cluster 202 can include at least one battery 100, and optionally can include two or more batteries 100, the control box 201 included can be connected with the battery cluster 202, and the control box 201 is used to control and manage the battery 100 of the battery cluster 202, for example, can control the on-off state of the battery cluster 202, etc.

[0146] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising: a housing; an electrode assembly disposed in the housing; an end cap assembly closing an opening of the housing along a first direction, the end cap assembly comprising a cover plate and an electrode terminal, the electrode terminal comprising a terminal plate for electrically connecting with an external device and a post for electrically connecting with the electrode assembly, the terminal plate being electrically connected with at least two posts of the same polarity; a deformable member connected to the cover plate, the deformable member being deformable to contact the terminal plate; wherein the deformable member is disposed between the at least two posts of the same polarity.

2. The battery cell of claim 1, wherein, The at least two posts of the same polarity comprise first posts, at least one of the first posts being disposed to electrically connect with the electrode assembly.

3. The battery cell of any one of claims 1-2, wherein, The at least two posts of the same polarity are disposed to be riveted to the terminal plate and the cover plate.

4. The battery cell of any one of claims 1-3, wherein, The battery cell comprises two electrode terminals of opposite polarity.

5. The battery cell of any one of claims 1-4, wherein, The posts have the same structure.

6. The battery cell of claim 2, wherein, The first posts are disposed to be close to a middle region of the cover plate along a second direction.

7. The battery cell according to any one of claims 1 to 6, wherein, The end cap assembly further comprises a first insulating member, the first insulating member comprising a first recess, the at least two posts of the same polarity comprise second posts, the second posts being disposed to be away from the middle region of the cover plate along the second direction, the second posts being disposed to correspond to the first recess of the first insulating member, the first recess being disposed to electrically isolate the electrode assembly from the second posts.

8. The battery cell of claim 7, wherein, The second posts are disposed to extend into the first recess.

9. The battery cell of claim 7, wherein, The first insulating member comprises a second recess, the second recess being disposed on a side of the deformable member close to the electrode assembly, the second recess being provided with a communication hole in communication with a cavity in the housing.

10. The battery cell of any one of claims 1 to 9, wherein, The end cap assembly further comprises a second insulating member, the second insulating member being disposed between the terminal plate and the cover plate.

11. The battery cell of any one of claims 1 to 10, wherein, The posts comprise first riveting portions disposed to connect with the terminal plate and second riveting portions disposed on a side of the cover plate close to the electrode assembly, the second riveting portions being disposed to be clamped to the cover plate.

12. The battery cell of any one of claims 1 to 11, wherein, The battery cell comprises two electrode terminals of opposite polarity, the electrode terminals comprising two posts of the same polarity, the deformable member being disposed between the two posts of the same polarity. 13.A battery comprising the battery cell according to any one of claims 1 to 12. 14.An electric device comprising the battery according to claim 13.

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