Battery cell, battery and electric device

Abstract

A battery cell (20), a battery (100) and an electric device. The battery cell (20) comprises: a casing (21); an electrode assembly (22) arranged in the casing (21); an end cover assembly (23) for closing an opening (211) of the casing (21) in a first direction (X), the end cover assembly (23) comprising a cover plate (231) and an electrode terminal (232) electrically connected to the electrode assembly (22); and a deformable member (24) connected to the cover plate (231), wherein the deformable member (24) is configured to be deformable to come into contact with the electrode terminal (232); and the cover plate (231) comprises a mounting area (23a) for mounting the electrode terminal (232), and the mounting area (23a) has a reinforcing structure (233). When the battery cell (20) performs an overcharge protection function, the stable contact between the deformable member (24) and the electrode terminal (232) can be facilitated, thereby ensuring the reliability of the battery cell (20) itself.

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410865455.3, filed on June 28, 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 is 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, there is a risk of poor contact between components, 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. When the battery cell performs the overcharge protection function, it can ensure stable contact between components, thereby ensuring the reliability of the battery cell itself.

[0008] In a first aspect, the present application provides a battery cell, comprising: a shell; an electrode assembly arranged in the shell; an end cover assembly closing an opening of the shell along a first direction, the end cover assembly comprising a cover plate and an electrode terminal electrically connected with the electrode assembly; a deformable member arranged to be deformed to contact the electrode terminal; wherein the cover plate comprises a mounting area for mounting the electrode terminal, and the mounting area has a reinforcing structure.

[0009] In the technical scheme of the present application, the battery cell comprises a shell, an electrode assembly, an end cover assembly and a deformable member. The electrode terminal is electrically connected with the electrode assembly, which can meet the charging and discharging requirements of the battery cell. The deformable member is arranged to deform and contact the electrode terminal under the action of the swelling pressure when the battery cell swells due to overcharge and other problems, so as to cut off the overcharge circuit. Since the mounting area for mounting the electrode terminal has a reinforcing structure, the swelling deformation amount of the mounting area can be reduced when the battery cell swells due to overcharge and other problems, which ensures good contact between the deformable member and the electrode terminal, timely cuts off the overcharge circuit, and improves the reliability of the battery cell.

[0010] In some embodiments, the reinforcing structure comprises a first recess and a first protrusion on the side of the cover plate away from the electrode assembly, and the electrode terminal comprises a terminal plate and a pole, the first protrusion is arranged around the terminal plate, and the terminal plate is arranged in the first recess.

[0011] The battery cell provided in an embodiment of the present application comprises a reinforcing structure comprising a first recess and a first protrusion, which can improve the strength of the mounting area through the first recess and the first protrusion, and the terminal plate is arranged in the first recess and the second protrusion is arranged around the terminal plate, so that when the deformable member is deformed under the action of the swelling pressure and contacts the electrode terminal, the contact between the deformable member and the electrode terminal is ensured. In addition, the arrangement of the first protrusion can also block the electrolyte overflowing during the processes such as liquid injection and transfer, reduce or avoid the electrolyte entering the battery cell from the area opposite to the electrode assembly and the deformable member, and improve the reliability of the battery cell.

[0012] In some embodiments, the reinforcing structure comprises a second recess and a second protrusion on the side of the cover plate close to the electrode assembly, the electrode terminal passes through the second protrusion, and / or the deformable member is mounted on the second protrusion.

[0013] The battery cell provided in an embodiment of the present application comprises a reinforcing structure comprising a second recess and a second protrusion, which can improve the strength of the mounting area through the second recess and the second protrusion, and the electrode terminal passes through the second protrusion, and the deformable member is mounted on the second protrusion, which can arrange the electrode terminal in the area where the second protrusion with higher strength is located, and can ensure the electrical connection requirement between the electrode assembly and the electrode terminal. Further, the arrangement of the second recess can at least partially disconnect the mounting area from other areas of the cover plate, when the battery cell produces gas due to overcharging, causing the shell, cover plate and the like to swell, the pressure can be released at the second recess, reducing the influence of the deformation of the cover plate on the mounting area, and further reducing the deformation of the mounting area and the electrode terminal, so that when the deformable member deforms and contacts the electrode terminal under a predetermined pressure, the contact between the two is ensured, and the overcharge circuit is quickly cut off.

[0014] In some embodiments, the second protrusion corresponds to the first recess, the second protrusion is provided with a first through hole and a second through hole, the electrode terminal is mounted at the first through hole, and / or the deformable member is mounted at the second through hole, and the deformable member contacts the electrode terminal by deforming through the second through hole.

[0015] The battery cell provided in an embodiment of the present application is provided with a first through hole and a second through hole on the second protrusion, which is beneficial to the installation of the electrode terminal and the deformable member, and can ensure the avoidance of the deformation of the deformable member, so that the deformable member can contact the electrode terminal well. In addition, the second protrusion corresponds to the first recess, which is beneficial to the increase of the strength of the area, and is also beneficial to the synchronous forming of the second protrusion and the first recess, reducing the difficulty of forming.

[0016] In some embodiments, the second recess is arranged corresponding to the first protrusion.

[0017] The battery cell provided by one embodiment of the present application is arranged with the second recess corresponding to the first protrusion, which is conducive to the increase of the strength of the region, and facilitates the synchronous forming of the second protrusion and the first recess, and reduces the forming difficulty.

[0018] In some embodiments, the second protrusion is arranged with a stepped portion corresponding to the sidewall of the second through hole, and the stepped portion is used for mounting the deformable member.

[0019] The battery cell provided by one embodiment of the present application is arranged with the second protrusion corresponding to the sidewall of the second through hole, which can provide support for the deformable member by the stepped portion, and facilitates the installation and limiting of the deformable member.

[0020] In some embodiments, the reinforcing structure is punched from the side of the cover plate away from the electrode assembly towards the electrode assembly.

[0021] The battery cell provided by one embodiment of the present application is arranged with the reinforcing structure punched from the side of the cover plate away from the electrode assembly towards the electrode assembly, which can not only ensure the strength reinforcement requirement of the mounting region, but also simplify the forming process of the reinforcing structure.

[0022] In some embodiments, the cover plate further comprises a base region connected with the mounting region, and along the first direction, the thickness dimension of the base region is A, and the depth dimension of the first recess is B, wherein 0.03≤B / A≤1.

[0023] The battery cell provided by one embodiment of the present application is arranged with the value of B / A being any value within the range of 0.03-1, which can not only ensure the strength reinforcement of the mounting region, but also make the strength of the mounting region greater than that of the base region. Meanwhile, the ratio range makes the first recess easy to be formed by punching or other methods, and reduces the forming difficulty.

[0024] In some embodiments, the cover plate further comprises a base region connected with the reinforcing region, and along the first direction, the thickness dimension of the base region is A, and the vertical distance between the end of the second protrusion towards the electrode assembly and the bottom wall of the first recess is E, A-E≥2mm.

[0025] The battery cell provided by one embodiment of the present application is arranged as above, which can not only ensure the strength increase requirement of the mounting region, but also limit the overall height of the end cover assembly within a proper range, and reduce the forming difficulty.

[0026] In some embodiments, along the second direction, the width dimension of the second recess is D1, the width dimension of the first protrusion is D2, D1>D2, and the second direction is arranged intersecting the first direction.

[0027] The battery cell provided by one embodiment of the present application is beneficial for simultaneously forming the first protrusion and the second recess by means of stamping a cover plate, reduces the forming difficulty of the battery cell, and simplifies the forming process, by making the width dimension of the first protrusion less than the width dimension of the second recess.

[0028] In some embodiments, along the first direction, the depth of the second recess is D3, and the height of the first protrusion is D4, and D3>D4.

[0029] The battery cell provided by one embodiment of the present application is beneficial for simultaneously forming the first protrusion and the second recess by means of stamping a cover plate, reduces the forming difficulty of the battery cell, and simplifies the forming process, by making the width dimension of the first protrusion less than the width dimension of the second recess.

[0030] In some embodiments, the electrode terminals are arranged in pairs and have opposite polarities, the reinforcing structure of the mounting area is arranged one-to-one with the electrode terminals, and each electrode terminal is respectively arranged with a deformable member.

[0031] The battery cell provided by one embodiment of the present application is beneficial for meeting the charging and discharging requirements of the battery cell, and is beneficial for ensuring the stable contact between components, thereby ensuring the reliability of the battery cell itself.

[0032] In a second aspect, the present application provides a battery comprising the battery cell described above.

[0033] In a third aspect, the present application provides a power consumption device comprising the battery described above.

[0034] 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 more clearly understood, and to be implemented 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

[0035] 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:

[0036] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0037] FIG. 2 is a structural schematic diagram of a battery according to an embodiment of the present application;

[0038] FIG. 3 is a schematic diagram of an exploded structure of a battery monomer according to an embodiment of the present application;

[0039] FIG. 4 is a top view of an end cover assembly according to an embodiment of the present application;

[0040] FIG. 5 is a sectional view along direction A-A of FIG. 4;

[0041] FIG. 6 is an isometric view of a cover plate according to an embodiment of the present application;

[0042] FIG. 7 is a top view of the cover plate according to an embodiment of the present application;

[0043] FIG. 8 is a sectional view along direction B-B of FIG. 7;

[0044] FIG. 9 is a partial enlarged view of M in FIG. 8;

[0045] FIG. 10 is a schematic diagram of a structure of an energy storage device according to an embodiment of the present application.

[0046] Label Description: 1, vehicle; 100, battery; 200, battery module; 300, controller; 400, motor; 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 monomer; 21, shell; 211, opening; 22, electrode assembly; 23, end cover assembly; 231, cover plate; 23a, mounting area; 23b, base area; 232, electrode terminal; 232a, pole; 232b, terminal plate; 233, reinforcing structure; 2331, first recess; 2332, first protrusion; 2333, second recess; 2334, second protrusion; 2334a, first through hole; 2334b, second through hole; 24, deformable member; 25, adapter plate; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0047] 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.

[0048] 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 meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0049] 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.

[0050] 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.

[0051] 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, or 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.

[0052] 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.

[0053] 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 used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of secondary batteries, the market demand is also increasing.

[0054] The secondary battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery monomers. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomers.

[0055] The battery monomer may have overcharge problem in use. In order to alleviate the influence of the overcharge problem on the reliability of the battery monomer, a deformable member is correspondingly arranged. When the battery monomer is in overcharge working condition, the deformable member contacts the electrode terminal to form a positive and negative short circuit loop and generate a large current. The large current can melt the fuse in the loop in a short time to cut off the overcharge loop in time. In the related technology, when the battery monomer performs the overcharge protection function, there is a risk of poor contact between the deformable member and the electrode terminal of the end cover assembly, which affects the reliability of the battery monomer. Further research shows that the battery monomer is prone to swelling deformation in the case of overcharge. In the overcharge of the swelling deformation of the battery monomer, when the deformable member contacts the electrode terminal in the overcharge working condition, due to the swelling deformation of the battery monomer, there is a risk of poor contact or contact failure between the two, which cannot cut off the overcharge loop in time, thereby affecting the reliability of the battery monomer.

[0056] In order to alleviate the problem of poor contact between the deformable member and the electrode terminal in the overcharge working condition, it is found that the influence of the deformation of the battery monomer on the contact between the deformable member and the electrode terminal can be alleviated, thereby improving the reliability of the battery monomer.

[0057] Based on the above consideration, in order to solve the problem of poor contact between the deformable member and the electrode terminal in the overcharge working condition, after deep research, a battery monomer is designed, which includes a shell, an electrode assembly, an end cover assembly and a deformable member. The electrode assembly is arranged in the shell, and the end cover assembly closes the opening of the shell along the first direction. The end cover assembly includes a cover plate and an electrode terminal electrically connected with the electrode assembly. The deformable member is connected to the cover plate. The deformable member can deform to contact the electrode terminal under a predetermined pressure. The cover plate includes a mounting area for mounting the electrode terminal, and the mounting area has a reinforcing structure.

[0058] In such a battery monomer, the electrode terminal is electrically connected with the electrode assembly, which can ensure the charging and discharging demand of the battery monomer. The deformable member is arranged, so that when the battery monomer swells due to overcharge or other problems, the deformable member can deform and contact the electrode terminal under the action of the swelling pressure to cut off the overcharge loop. Since the mounting area for mounting the electrode terminal has a reinforcing structure, when the battery monomer swells due to overcharge or other problems, the swelling deformation amount of the mounting area can be reduced, the contact between the deformable member and the electrode terminal is ensured, the overcharge loop can be cut off in time, and the reliability of the battery monomer is improved.

[0059] The technical solutions described in the embodiments of the present application are suitable for batteries and electric devices using the batteries.

[0060] 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, etc. 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, light 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.

[0061] It should be understood that the technical solutions described in the embodiments of the present application are not only suitable for the above-described batteries and electric devices, but also suitable for all batteries including a box body and electric devices using the batteries. For the sake of brevity of description, the following embodiments are described by taking an electric vehicle as an example.

[0062] For example, as shown in FIG. 1, it 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. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. 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, and used for the circuit system of the vehicle 1, for example, used for the starting, navigation, and working power demand of the vehicle 1 during running. 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, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0063] As shown in FIG. 2 and FIG. 3, in order to meet different power requirements, the battery 100 can include a plurality of battery monomers 20. The plurality of battery monomers 20 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 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 directly form the battery 100, or can first form the battery module 200, and then the battery module 200 forms the battery 100.

[0064] 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 monomers 20. The battery 100 can also include a box 10 (or cover body), which is hollow inside and in which the plurality of battery monomers 20 are accommodated.

[0065] 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 thereto. 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 thereto.

[0066] The box 10 is used to accommodate the battery monomers 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 jointly define an accommodation space for accommodating the battery monomers 20. The second box part 12 can be a hollow structure with an opening 211 at one end, and the first box part 11 is a plate structure, which is covered on the opening 211 side of the second box part 12 to form a box with an accommodation space; the first box part 11 and the second box part 12 can also be hollow structures with an opening 211 at one side, and the opening 211 side of the first box part 11 is covered on the opening 211 side of the second box part 12 to form a box with an 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.

[0067] 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.

[0068] 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 called an upper box cover, and the second box part 12 can also be called a lower box.

[0069] 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. 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.

[0070] 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. The multiple battery modules 200 are then connected in series, in parallel or in a mixed manner to form a whole and are accommodated in the box.

[0071] The multiple battery cells 20 in the battery module 200 can be electrically connected through a busbar component to realize the parallel connection, series connection or mixed connection of the multiple battery cells 20 in the battery module 200.

[0072] 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 also 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 also not limited in this regard. However, for the sake of simplicity, the following embodiments will be described with reference to the square battery cell 20.

[0073] As shown in FIGS. 3-6, the battery cell 20 can include 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 the opening 211 of the shell 21 along the first direction X, the end cover assembly 23 includes a cover plate 231 and an electrode terminal 232 electrically connected with the electrode assembly 22, and the deformable member 24 is connected to the cover plate 231 and is arranged to be deformable to contact the electrode terminal 232. The cover plate 231 includes a mounting area 23a for mounting the electrode terminal 232, and the mounting area 23a has a reinforcing structure 233.

[0074] The shell 21 can be in various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of this application do not have special limitations in this regard.

[0075] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained within the case 21.

[0076] The electrode assembly 22 can include first and second polar plates of opposite polarity and a separator, which are wound in a winding direction to form a wound structure, or can be formed in a laminated structure in a laminated manner.

[0077] 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 of course, the second polar plate can also be in the form of a polar plate including a current collector and an active material layer in a conventional arrangement.

[0078] The separator can be made of PP (polproplene) or PE (polethlene) or the like. The separator can be held between the first and second polar plates to insulate the first and second polar plates from each other.

[0079] The end cap assembly 23 refers to a component that is fitted to the opening 211 of the case 21 and encloses the case 21 to form an accommodation cavity for accommodating the electrode assembly 22, and that isolates the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 23 can be adapted to the shape of the case 21 to fit the case 21. Alternatively, the end cap assembly 23 can be made of a material having a certain hardness and strength, such as an aluminum alloy, so that the end cap assembly 23 is less likely to deform when subjected to a pressing impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. The end cap assembly 23 can include a cover plate 231 and an electrode terminal 232, the cover plate 231 being mechanically connected to the case 21, and the electrode terminal 232 being electrically connected to the electrode assembly 22.

[0080] The cover plate 231 can be made of a material having a certain hardness and strength, such as an aluminum alloy, so that the cover plate 231 is less likely to deform when subjected to a pressing impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. 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 does not make special limitations thereto.

[0081] The electrode terminal 232 is provided to the cover plate 231 and is electrically connected to the electrode assembly 22. In the battery cell 20, the electrode terminal 232 is used to be connected to a busbar component to achieve electrical connection between a plurality of battery cells 20.

[0082] The number of electrode terminals 232 provided on the cover plate 231 can be one or two, and when two, the polarities of the two electrode terminals 232 can be opposite.

[0083] In some embodiments, the battery cell 20 can include a pressure relief mechanism for relieving the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0084] Exemplarily, the pressure relief mechanism can be a component such as a rupture disc, a burst disc, a gas valve, a pressure relief valve, or a safety valve.

[0085] The deformable member 24 can be an electrically conductive sheet, which can be a copper electrically conductive sheet, an aluminum electrically conductive sheet, or other metal electrically conductive sheet, etc.

[0086] The deformable member 24 and the electrode assembly 22 have two states. When the battery cell 20 is normally working, the deformable member 24 is arranged separately from the electrode terminal 232, and the battery cell 20 can normally charge and discharge. When the battery cell 20 swells due to overcharging, etc., the deformable member 24 deforms under the action of overcharging pressure, so that it can at least partially move to the side where the electrode terminal 232 is located and contact the electrode terminal 232, so that the electrode terminals 232 with opposite polarities are electrically connected to form a short-circuit loop, the transient current in the loop increases, and the structure such as the adapter sheet 25 connecting the electrode assembly 22 and the electrode terminal 232 is melted to cut off the overcharging loop.

[0087] When the battery cell 20 includes two end cover assemblies 23, the number of mounting areas 23a provided on the cover plate 231 can be one. When the battery cell 20 includes one end cover assembly 23, the number of mounting areas 23a provided on the end cover assembly 23 can be two.

[0088] Exemplarily, the number of deformable members 24 provided on the end cover assembly 23 can be one or two, and when two, the number of corresponding mounting areas 23a can also be two, and each mounting area 23a corresponds to one deformable member 24 and one electrode terminal 232.

[0089] The first direction X can be the height direction of the battery cell 20. The shell 21 can have one opening 211 in the first direction X, and of course can also have two openings 211.

[0090] In the first direction X, the orthographic projection shape of the mounting area 23a can be circular or polygonal.

[0091] The orthographic projection of the mounting area 23a can cover part of the orthographic projection of the deformable member 24.

[0092] The deformable member 24 and the cover plate 231 can be connected by welding, etc.

[0093] The reinforcing structure 233 can include a structure in the form of a recess, a protrusion, or a combination of recess and protrusion provided at the mounting area 23a.

[0094] The battery cell 20 provided by an embodiment of the present application includes a shell 21, an electrode assembly 22, an end cover assembly 23, and a deformable member 24 electrically connected to the electrode assembly 22 through an electrode terminal 232, which can ensure the charging and discharging requirements of the battery cell 20. The deformable member 24 is provided so that, when the battery cell 20 swells due to overcharging or other problems, the deformable member 24 can deform under the action of the swelling pressure and come into contact with the electrode terminal 232 to cut off the overcharging circuit. Since the mounting area 23a for mounting the electrode terminal 232 is provided with a reinforcing structure 233, when the battery cell 20 swells due to overcharging or other problems, the swelling deformation of the mounting area 23a can be reduced, so that the deformable member 24 can be in good contact with the electrode terminal 232, the overcharging circuit can be cut off in time, and the reliability of the battery cell 20 can be improved.

[0095] As shown in FIGS. 3 to 9, in some optional embodiments, the battery cell 20 provided by an embodiment of the present application includes a reinforcing structure 233 on the side of the cover plate 231 away from the electrode assembly 22, which includes a first recess 2331 and a first protrusion 2332, and the electrode terminal 232 includes a terminal plate 232b and a pole 232a, the first protrusion 2332 is arranged around the terminal plate 232b, and the terminal plate 232b is arranged in the first recess 2331.

[0096] The first recess 2331 can be recessed from the side of the cover plate 231 away from the electrode assembly 22 to the side where the electrode assembly 22 is located in the first direction X.

[0097] The shape of the first recess 2331 can match the shape of the terminal plate 232b, and the first recess 2331 can be formed by stamping or the like.

[0098] The first protrusion 2332 can be arranged at the periphery of the terminal plate 232b and arranged around the terminal plate 232b. The orthographic projection shape of the first protrusion 2332 in the first direction X can be a circular ring, an elliptical ring, or a polygonal ring. The structure form can be set according to the structure form of the terminal plate 232b.

[0099] The battery cell 20 provided by one embodiment of the present application has the reinforcing structure 233 including the first recess 2331 and the first protrusion 2332, which can improve the strength of the mounting area 23a through the first recess 2331 and the first protrusion 2332, and the terminal plate 232b is located in the first recess 2331 and the second protrusion 2334 is arranged around the terminal plate 232b, so that when the deformable member 24 is deformed under the action of the swelling pressure and contacts the electrode terminal 232, the deformable member 24 can be ensured to be in good contact with the electrode terminal 232. In addition, the arrangement of the first protrusion 2332 can also block the electrolyte overflowing during the processes such as injection and transfer, reduce or avoid the electrolyte entering the battery cell 20 from the area opposite to the electrode assembly 22 and the deformable member 24, and improve the reliability of the battery cell 20.

[0100] In some optional embodiments, the battery cell 20 provided by one embodiment of the present application has the reinforcing structure 233 including the second recess 2333 and the second protrusion 2334 on the side of the cover plate 231 close to the electrode assembly 22, and the electrode terminal 232 is arranged through the second protrusion 2334.

[0101] The second recess 2333 can be recessed from the side of the cover plate 231 facing the electrode assembly 22 to the side away from the electrode assembly 22 in the first direction X. The second recess 2333 can be a circular groove, an elliptical groove or a polygonal groove.

[0102] The second protrusion 2334 can be arranged protruding to the side of the electrode assembly 22 in the first direction X.

[0103] The electrode terminal 232 can be arranged through part of the second protrusion 2334. When the electrode terminal 232 includes the terminal plate 232b and the pole 232a, the pole 232a of the electrode terminal 232 can be arranged through the second protrusion 2334.

[0104] The deformable member 24 can be mounted outside the second protrusion 2334, and of course, the deformable member 24 can be optionally mounted on the second protrusion 2334.

[0105] The battery cell 20 provided by one embodiment of the present application has the reinforcing structure 233 including the second recess 2333 and the second protrusion 2334, which can improve the strength of the mounting area 23a through the second recess 2333 and the second protrusion 2334, and the electrode terminal 232 is arranged through the second protrusion 2334, and the deformable member 24 is mounted on the second protrusion 2334, which can arrange the electrode terminal 232 in the area of the second protrusion 2334 with higher strength, and ensure the electrical connection between the electrode assembly 22.

[0106] Further, the second recess 2333 can at least partially disconnect the mounting area 23a from other areas of the cover plate. When the battery cell 20 produces gas due to overcharging, causing the shell 21 and the cover plate 231 to expand, the second recess 2333 can provide a pressure relief, reducing the impact of the deformation of the cover plate 231 on the mounting area 23a, and further reducing the deformation of the mounting area 23a and the electrode terminal 232. When the deformable member 24 deforms and contacts the electrode terminal 232 under a predetermined pressure, the contact between the two can be ensured, and the overcharging circuit can be quickly disconnected.

[0107] In some embodiments, the second protrusion 2334 is provided corresponding to the first recess 2331. The second protrusion 2334 is provided with a first through-hole 2334a and a second through-hole 2334b. The electrode terminal 232 is mounted at the first through-hole 2334a, and / or the deformable member 24 is mounted at the second through-hole 2334b. The deformable member 24 deforms to pass through the second through-hole 2334b to contact the electrode terminal 232.

[0108] The second protrusion 2334 provided corresponding to the first recess 2331 can partially overlap the first recess 2331 in the first direction X.

[0109] The first through-hole 2334a and the second through-hole 2334b can be provided through the second protrusion 2334 in the first direction X.

[0110] The projection of the first through-hole 2334a and the second through-hole 2334b in the first direction X can be a circular hole, an elliptical hole, or a polygonal hole.

[0111] The shape and radial size of the first through-hole 2334a and the second through-hole 2334b can be the same or different. For example, the first through-hole 2334a and the second through-hole 2334b can both be circular holes, but their radial sizes can be different. Alternatively, the first through-hole 2334a and the second through-hole 2334b can be a circular hole and a polygonal hole, respectively.

[0112] The electrode terminal 232 mounted at the first through-hole 2334a can be understood as the electrode terminal 232 partially covering the first through-hole 2334a in the first direction X, and optionally partially inserted into the first through-hole 2334a.

[0113] The deformable member 24 mounted at the second through-hole 2334b can be understood as the deformable member 24 partially covering the second through-hole 2334b in the first direction X, and optionally partially inserted into the second through-hole 2334b. The deformable member 24 can deform and flip in the first direction X to partially extend into and pass through the second through-hole 2334b to contact the electrode terminal 232.

[0114] The battery monomer 20 provided by one embodiment of the present application is provided with the first through hole 2334a and the second through hole 2334b on the second protrusion 2334, which is conducive to the installation of the electrode terminal 232 and the deformable member 24, and can ensure the avoidance of the deformed deformable member 24, so that the deformable member 24 can be in good contact with the electrode terminal 232. The second protrusion 2334 is arranged corresponding to the first recess 2331, which is conducive to the increase of the strength of the region, and is conducive to the synchronous forming of the second protrusion 2334 and the first recess 2331, thereby reducing the forming difficulty.

[0115] In some embodiments, the second recess 2333 is arranged corresponding to the first protrusion 2332.

[0116] The orthographic projection of the second recess 2333 and the orthographic projection of the first protrusion 2332 can at least partially overlap each other along the first direction X.

[0117] The battery monomer 20 provided by one embodiment of the present application is provided with the second recess 2333 corresponding to the first protrusion 2332, which is conducive to the increase of the strength of the region, and is conducive to the synchronous forming of the second protrusion 2334 and the first recess 2331, thereby reducing the forming difficulty.

[0118] In some embodiments, the second protrusion 2334 is provided with a stepped portion corresponding to the side wall of the second through hole 2334b, and the stepped portion is used for installing the deformable member 24.

[0119] The second through hole 2334b can be a stepped hole and include different radial size hole segments, so as to form the stepped portion on the side wall. The radial size of the second through hole 2334b on the side facing the electrode assembly 22 along the first direction X can be greater than the radial size of the side away from the electrode assembly 22.

[0120] The battery monomer 20 provided by one embodiment of the present application is provided with the second protrusion 2334 corresponding to the side wall of the second through hole 2334b, which can provide support for the deformable member 24 by the stepped portion, and is conducive to the installation and limiting of the deformable member 24.

[0121] In some embodiments, the reinforcing structure 233 is punched from the side of the cover plate 231 away from the electrode assembly 22 towards the electrode assembly 22.

[0122] Optionally, the first recess 2331 and the second protrusion 2334 can be punched from the side of the cover plate 231 away from the electrode assembly 22 towards the electrode assembly 22.

[0123] The battery monomer 20 provided by one embodiment of the present application can ensure the strength requirement of the mounting area 23a and simplify the forming process of the reinforcing structure 233 by stamping the reinforcing structure 233 from the side of the cover plate 231 away from the electrode assembly 22 towards the electrode assembly 22.

[0124] As shown in FIGS. 3-9, in some optional embodiments, the battery monomer 20 provided by one embodiment of the present application, the cover plate 231 further comprises a base area 23b connected with the mounting area 23a, the thickness dimension A of the base area 23b along the first direction X, and the depth dimension B of the first recess 2331, wherein 0.03≤B / A≤1.

[0125] The thickness dimension A of the base area 23b can be understood as the base thickness of the cover plate 231. The cover plate 231 can have two end faces at the position of the base area 23b, and the vertical distance between one end face to the other end face can be understood as the thickness dimension of the base area 23b.

[0126] The depth dimension B of the first recess 2331 can be understood as the vertical distance between the bottom wall of the first recess 2331 and the surface of the base area 23b away from the electrode assembly 22.

[0127] The value of B / A can be any value between 0.03 and 1, including the two end values 0.03 and 1. Optionally, the value of B / A can be 0.1-1.

[0128] The battery monomer 20 provided by one embodiment of the present application can ensure the strength increase of the mounting area 23a and make the strength thereof greater than that of the base area 23b by setting the value of B / A to be any value between 0.03 and 1. Meanwhile, this range of ratio makes the recess easy to form and reduces the forming difficulty.

[0129] In some optional embodiments, the battery monomer 20 provided by one embodiment of the present application, the vertical distance E between the one end of the second protrusion 2334 towards the electrode assembly 22 and the bottom wall of the first recess 2331, and the thickness dimension A of the base area 23b satisfy A-E≥2mm.

[0130] The battery monomer 20 provided by one embodiment of the present application can ensure the strength increase requirement of the mounting area 23a, limit the overall height of the end cover assembly 23 within a proper range, and reduce the forming difficulty thereof by the above setting.

[0131] Optionally, the height dimension C of the second protrusion 2334 protruding from the base area 23b and the thickness dimension A of the base area 23b satisfy 0.03≤C / A≤1.

[0132] The height dimension CC can be equal to the depth dimension B of the first recess 2331, and of course, the height dimension C can also be smaller than the depth dimension B of the first recess 2331.

[0133] The thickness dimension C of the second protrusion 2334 can be understood as a vertical distance between one end of the second protrusion 2334 facing the electrode assembly 22 and the other end of the second protrusion 2334 away from the electrode assembly 22 in the first direction X.

[0134] The value of C / A can be any value between 0.03 and 1, including the two end values 0.03 and 1. Alternatively, the value of C / A can be 0.1 to 1.

[0135] The battery monomer 20 provided by an embodiment of the present application can ensure the strength of the mounting area 23a by allowing the value of C / A to be any value between 0.03 and 1, so that the strength of the mounting area 23a is greater than the strength of the base area 23b. At the same time, this ratio range makes the second protrusion 2334 easy to form, reducing the difficulty of forming.

[0136] In some alternative embodiments, the first protrusion 2332 and the cover plate 231 are in an integrated structure.

[0137] The cover plate 231, the first protrusion 2332, and the second recess 2333 can be formed by injection molding or the like. Of course, stamping or the like can also be used to simultaneously form the second recess 2333 and the first protrusion 2332 on the cover plate 231.

[0138] The battery monomer 20 provided by an embodiment of the present application can ensure the pressure relief and blocking requirements of the end cover assembly 23, while reducing the difficulty of forming the end cover assembly 23 and improving production efficiency.

[0139] In some alternative embodiments, the battery monomer 20 provided by an embodiment of the present application has a width dimension D1 of the second recess 2333 and a width dimension D2 of the first protrusion 2332 along the second direction Y, D1>D2, and the second direction Y intersects the first direction X.

[0140] When the second recess 2333 is a ring-shaped groove, the second direction Y can be understood as the radial direction of the second recess 2333c or the radial direction of the first through hole.

[0141] The second recess 2333 has opposite first and second groove walls in the second direction Y, and the vertical distance between the first and second groove walls can be understood as the width dimension D1 of the second recess 2333.

[0142] The second recess 2333 can be a rectangular groove or a trapezoidal groove, and the width dimension D1 of the second recess 2333 can be understood as the maximum width dimension of the second recess 2333.

[0143] The first protrusion 2332 has a first side wall and a second side wall in the second direction Y, and the perpendicular distance between the first side wall and the second side wall can be understood as a width dimension D2 of the first protrusion 2332.

[0144] The battery monomer 20 provided by an embodiment of the present application is beneficial to synchronously forming the first protrusion 2332 and the second recess 2333 by adopting the stamping cover plate 231, reduces the forming difficulty of the battery monomer 20, and simplifies the forming process, by making the width dimension D2 of the first protrusion 2332 less than the width dimension of the second recess 2333.

[0145] In some optional embodiments, along the first direction X, the depth of the second recess 2333 is D3, and the height of the first protrusion 2332 is D4, and D3>D4.

[0146] The depth D3 of the second recess 2333 can be understood as the perpendicular distance between the side of the base area 23b facing the electrode assembly 22 and the bottom of the groove of the second recess 2333c.

[0147] The height D4 of the first protrusion 2332 can be understood as the perpendicular distance between the end of the first protrusion 2332 away from the electrode assembly 22 and the side of the base area 23b away from the electrode assembly 22.

[0148] The battery monomer 20 provided by an embodiment of the present application can ensure the pressure relief effect of the second recess 2333, while avoiding the first protrusion 2332 being too high to affect the overall area occupation and energy density of the battery monomer 20, by making the depth D3 of the second recess 2333 greater than the height D4 of the first protrusion 2332. Moreover, it is also beneficial to synchronously form the first protrusion 2332 and the second recess 2333 by adopting the stamping cover plate 231, reduces the forming difficulty of the battery monomer 20, and simplifies the forming process.

[0149] In some optional embodiments, the battery monomer 20 provided by an embodiment of the present application has electrode terminals 232 arranged in pairs and having opposite polarities, and the reinforcing structure 233 of the mounting area 23a is arranged one-to-one with the electrode terminals 232, and each electrode terminal 232 is respectively arranged with a deformable piece 24.

[0150] The deformable member 24 can be arranged one-to-one with the electrode terminal 232. The electrode terminals 232 arranged in pairs can be located on the same cover plate 231. When the electrode terminals 232 arranged in pairs are located on the same cover plate 231, the corresponding deformable members 24 arranged in pairs can also be located on the same cover plate 231. The cover plate 231 is provided with a mounting area 23a corresponding to each deformable member 24. 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. 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.

[0151] Of course, in some embodiments, the electrode terminals 232 arranged in pairs can also be located on different cover plates 231. Then, the deformable members 24 can be arranged on different cover plates 231. The specific arrangement can be determined according to the model and structural requirements of the battery monomer 20.

[0152] The battery monomer 20 provided in an embodiment of the present application is beneficial to meet the charging and discharging requirements of the battery monomer 20 and is beneficial to ensure the stable contact between components, thereby ensuring the reliability of the battery monomer 20.

[0153] 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, and a deformable member 24. The shell 21 can be a square shell 21, and the shell 21 has 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 have a winding structure, and the number of the electrode assembly 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 and an electrode terminal 232 electrically connected to the electrode assembly 22. The electrode terminal 232 can be arranged in pairs and have opposite polarities. Each electrode terminal 232 is provided with a deformable member 24, and the deformable member 24 is connected to the cover plate 231. The deformable member 24 is a deformable sheet, and the deformable member 24 can be deformed and in contact with the electrode terminal 232 under a predetermined pressure, and the deformable member 24 can be made of metal. The deformable member 24 and the cover plate 231 can be connected to each other by welding. The electrode terminal 232 includes a pole 232a and a terminal plate 232b, and the pole 232a is inserted into the terminal plate 232b and penetrates through the cover plate 231 and is electrically connected to the tab of the electrode assembly 22 through the adapter sheet 25. The terminal plate 232b is located on the side of the cover plate 231 away from the electrode assembly 22. The cover plate 231 includes a mounting area 23a for mounting the electrode terminal 232 and a base area 23b, and the mounting area 23a has a reinforcing structure 233. On the side of the cover plate 231 away from the electrode assembly 22, the reinforcing structure 233 includes a first recess 2331 and a first protrusion 2332, and the electrode terminal 232 includes the terminal plate 232b and the pole 232a. The first protrusion 2332 surrounds the terminal plate 232b and is arranged in the first recess 2331. On the side of the cover plate 231 close to the electrode assembly 22, the reinforcing structure 233 includes a second recess 2333 and a second protrusion 2334, and the electrode terminal 232 penetrates through the second protrusion 2334 and is arranged in the second recess 2333. The deformable member 24 is mounted on the second protrusion 2334. The second protrusion 2334 corresponds to the first recess 2331, and the second protrusion 2334 is provided with a first through hole 2334a and a second through hole 2334b. The electrode terminal 232 is mounted at the first through hole 2334a, and the deformable member 24 is mounted at the second through hole 2334b. The deformable member 24 is in contact with the electrode terminal 232 by deforming through the second through hole 2334b. The second recess 2333 corresponds to the first protrusion 2332, and the second protrusion 2334 is provided with a step portion corresponding to the side wall of the second through hole 2334b, and the step portion is used for mounting the deformable member 24.The thickness dimension of the base area 23b is A, the depth dimension of the first recess 2331 is B, wherein B / A can be 0.5, and 0.1mm≤B≤3mm, the second protrusion 2334 is an integral structure with the cover plate 231, the vertical distance between the end of the second protrusion 2334 facing the electrode terminal 232 and the bottom wall of the first recess 2331 is E, the thickness dimension A of the base area 23b and the vertical distance E satisfy A-E equals 2mm. The orthographic projection of the second recess 2333c in the first direction X is arranged around the orthographic projection of the first recess 2331, the first protrusion 2332 is an integral structure with the cover plate 231, along the second direction Y, the width dimension of the second recess 2333 is D1, and 10mm≥D1≥0.5mm. The width dimension of the first protrusion 2332 is D2, D1>D2, the second direction Y is arranged perpendicularly to the first direction X, along the first direction X, the depth of the second recess 2333 is D3, the height of the first protrusion 2332 is D4, D3>D4, and 3mm≥D3≥0.1mm.

[0154] In another aspect, an embodiment of the present application also provides a battery 100 comprising the battery cell 20 provided by the above embodiments.

[0155] In another aspect, an embodiment of the present application also provides a battery 100 comprising the battery cell 20 provided by the above embodiments.

[0156] In another aspect, an embodiment of the present application also provides a battery 100 comprising the battery cell 20 provided by the above embodiments.

[0157] 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.

[0158] 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 can optionally include two or more battery devices 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 switching state of the battery cluster 202, etc.

[0159] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A single battery cell, comprising: case; Electrode assembly, disposed within the housing; An end cap assembly that closes the opening of the housing along a first direction, the end cap assembly including a cover plate and electrode terminals electrically connected to the electrode assembly; A deformable element, connected to the cover plate, is configured to deform to contact the electrode terminal; The cover plate includes a mounting area for mounting the electrode terminals, and the mounting area has a reinforcing structure.

2. The battery cell according to claim 1, wherein, On the side of the cover plate away from the electrode assembly, the reinforcing structure includes a first recess and a first protrusion. The electrode terminal includes a terminal plate and a post. The first protrusion is disposed around the terminal plate, and the terminal plate is disposed within the first recess.

3. The battery cell according to any one of claims 1-2, wherein, On the side of the cover plate near the electrode assembly, the reinforcing structure includes a second recess and a second protrusion, the electrode terminal is disposed through the second protrusion, and / or the deformable member is mounted on the second protrusion.

4. The battery cell according to claim 3, wherein, The reinforcing structure includes a first recess and a first protrusion, the second protrusion being disposed corresponding to the first recess, the second protrusion being provided with a first through hole and a second through hole, the electrode terminal being mounted at the first through hole, and / or the deformable member being mounted at the second through hole, the deformable member being deformed through the second through hole and contacting the electrode terminal.

5. The battery cell according to any one of claims 3-4, wherein, The second recess is provided corresponding to the first protrusion.

6. The battery cell according to any one of claims 4-5, wherein, The second protrusion has a stepped portion on the sidewall corresponding to the second through hole, and the stepped portion is used to install the deformable part.

7. The battery cell according to any one of claims 1-6, wherein, The reinforcing structure is formed by stamping the side of the cover plate away from the electrode assembly toward the electrode assembly.

8. The battery cell according to any one of claims 2 to 6, wherein, The cover plate also includes a base area connected to the reinforcing area. Along the first direction, the thickness of the base area is A, and the depth of the first recess is B, wherein 0.03≤B / A≤1.

9. The battery cell according to any one of claims 2 to 6, wherein, The cover plate also includes a base area connected to the mounting area. Along the first direction, the thickness of the base area is A, and the vertical distance between the end of the second protrusion facing the electrode assembly and the bottom wall of the first recess is E, where AE ≥ 2 mm.

10. The battery cell according to any one of claims 3 to 6, wherein, Along the second direction, the width of the second recess is D1, the width of the first protrusion is D2, D1 > D2, and the second direction intersects with the first direction.

11. The battery cell according to any one of claims 3 to 6, wherein, Along the first direction, the depth of the second concave portion is D3, and the height of the first convex portion is D4, where D3 > D4.

12. The battery cell according to any one of claims 1 to 11, wherein, The electrode terminals are arranged in pairs with opposite polarities, and the reinforcing structure of the mounting area is arranged one-to-one with the electrode terminals. Each electrode terminal is respectively provided with the deformable member.

13. A battery comprising a battery cell as described in any one of claims 1 to 12.

14. An electrical device comprising the battery as claimed in claim 13.

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