Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery cell includes a housing, an electrode assembly, and a first support. The shell comprises a shell body and a first end cover assembly, the shell body is provided with a first opening, and the first end cover assembly covers the first opening. The electrode assembly is contained in the shell and comprises a plurality of pole pieces, each pole piece comprises a main body part and a pole lug, the main body parts and the first end cover assembly are arranged in the first direction, and the pole lugs are led out from the main body parts towards the end faces of the end covers. The first supporting piece is located between the main body part and the first end cover assembly, a first concave part is arranged on one side, facing the main body part, of the first supporting piece, in the first direction, the projection of the end part of the main body part in the second direction is overlapped with the projection of the first concave part, and the first direction, the second direction and the thickness direction of the battery monomer are perpendicular to one another. The reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery cell, a battery device, and an electrical device. Background Art

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, battery-powered vehicles, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve the reliability of battery cells has always been a research direction in battery technology. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell. The battery cell includes a housing, an electrode assembly, and a first support member. The housing includes a housing body and a first end cap assembly. The housing body has a first opening, and the first end cap assembly covers the first opening. The electrode assembly is accommodated in the housing. The electrode assembly includes a plurality of electrode plates. The electrode plate includes a main body portion and a tab. The main body portion and the first end cap assembly are arranged along a first direction. The tab extends from an end face of the main body portion facing the end cap. The first support member is located between the main body portion and the first end cap assembly. A first concave portion is provided on a side of the first support member facing the main body portion. In the first direction, the projection of an end portion of the main body portion along a second direction overlaps with the projection of the first concave portion. The first direction, the second direction, and the thickness direction of the battery cell are perpendicular to each other.

[0006] In the above solution, the electrode assembly is supported by providing the first support member in the housing. When the battery cell is subjected to an external impact, at least a part of the corner position of the electrode plate in the electrode assembly can move into the first concave portion. Due to the support of the first support member for the electrode assembly, the possibility of contact and mutual extrusion between the corner position of the electrode plate in the electrode assembly and the first support member is reduced, and further the risk of the corner position of the electrode plate in the electrode assembly being crushed is reduced, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the number of the first concave portions is two, and the two first concave portions are respectively provided at two ends of the first support member along the second direction.

[0008] In the above solution, through the above arrangement, the possibility of contact and mutual extrusion between the corner position of the electrode plate in the electrode assembly and the first support member is further reduced, and further the risk of the corner position of the electrode plate in the electrode assembly being crushed is reduced, thereby improving the reliability of the battery cell.

[0009] In some embodiments, the outer shell further includes a second end cap assembly, the housing further includes a second opening, the first opening and the second opening are disposed opposite to each other, and the second end cap assembly covers the second opening. The number of the first support members is two, and the two first support members are respectively disposed between the first end cap assembly and the main body portion and between the second end cap assembly and the main body portion.

[0010] In the above solution, one of the two first support members is located between the first end cap assembly and the main body portion, and the other first support member is located between the second end cap assembly and the main body portion, so that the projections of the four corner positions of the pole piece along the first direction are all located within the projection of the first recess in the first support member near the corner position along the first direction, and the projections of the four first side corners of the electrode assembly extending in the thickness direction along the first direction are all located within the projection of the first recess in the first support member near the corner position along the first direction. This is beneficial to further reduce the possibility that the corner position of the pole piece in the electrode assembly contacts and presses against the first support member, thereby reducing the risk of the corner position of the pole piece in the electrode assembly being crushed and improving the reliability of the battery cell.

[0011] In some embodiments, the housing includes a bottom wall disposed opposite to the first end cap assembly, the number of the first support members is two, and the two first support members are respectively disposed between the first end cap assembly and the main body portion and between the bottom wall and the main body portion.

[0012] In the above solution, one of the two first support members is located between the first end cap assembly and the main body portion, and the other first support member is located between the bottom wall and the main body portion, so that the projections of the four corner positions of the pole piece along the first direction are all located within the projection of the first recess in the first support member near the corner position along the first direction, and the projections of the four first side corners of the electrode assembly extending in the thickness direction along the first direction are all located within the projection of the first recess in the first support member near the corner position along the first direction. This is beneficial to further reduce the possibility that the corner position of the pole piece in the electrode assembly contacts and presses against the first support member, thereby reducing the risk of the corner position of the pole piece in the electrode assembly being crushed and improving the reliability of the battery cell.

[0013] In some embodiments, the first recess includes a bottom surface and a side surface, and the bottom surface and the side surface are connected by an arc transition; and / or, the first support member includes a first surface facing the main body portion, and the first surface and the side surface are connected by an arc transition.

[0014] In the above solution, through the above arrangement, it is beneficial to further reduce the contact between the connection between the bottom surface and the side surface in the first recess and the corner position of the pole piece in the electrode assembly to be smoother, thereby reducing the risk of the corner position of the pole piece in the electrode assembly being crushed and improving the reliability of the battery cell.

[0015] In some embodiments, the first support member further includes an elastic portion located on a side of the first support member facing the main body portion.

[0016] In the above solution, by providing the elastic portion, the buffering performance of the first support member when the electrode assembly contacts the first support member is improved, and the possibility that the electrode assembly is crushed when the battery cell is subjected to an external impact and the electrode assembly and the first support member are squeezed against each other is reduced, thereby improving the reliability of the battery cell.

[0017] In some embodiments, the first support member further includes a channel that penetrates through the first support member, and the tab passes through the channel and is electrically connected to the first end cap assembly.

[0018] In the above solution, the first support member can insulate and isolate at least a part of the tab passing through the channel from the main body portion, so that when the battery cell is subjected to an external impact, the risk of the tab being inserted into the main body portion is reduced, the potential short - circuit hazard is reduced, and the safety is improved.

[0019] In some embodiments, the battery cell further includes a second support member, the electrode assembly includes two second surfaces opposite to each other in a second direction, and the second support member is located between the second surface and the housing.

[0020] In the above solution, since there is a gap between the electrode assembly and the housing when the electrode assembly is installed in the housing, by providing the second support member, it is beneficial to make the electrode assembly located in the middle area of the housing, thereby reducing the possibility that the excessive movement amount of the electrode assembly in the housing causes the tab in the electrode assembly to be pulled or even torn when the battery cell is impacted.

[0021] In some embodiments, the first support member includes a first main body portion and a connecting portion, and the connecting portion protrudes from one side of the first main body portion in a second direction. The second support member is provided with a connecting hole, and at least a part of the connecting portion is located in the connecting hole.

[0022] In the above solution, by providing the connecting hole and the connecting portion to fixedly connect the first support member and the second support member, it is beneficial to simplify the connection method between the first support member and the second support member and improve the production efficiency.

[0023] In some embodiments, the dimension of the connecting portion in a first direction is h, the dimension of the first support member in the first direction is H, and h and H satisfy the relationship: 0.2H ≤ h ≤ 0.8H.

[0024] In the above solution, the dimension of the connecting portion in the first direction is defined as greater than or equal to 0.2H, so as to improve the connection strength between the first support member and the second support member, reduce the deformation of the connection between the first support member and the second support member under the impact of the electrode assembly, and improve the reliability of the battery cell. In the embodiments of the present application, the dimension of the connecting portion in the first direction is defined as less than or equal to 0.8H, so as to reduce the dimension of the connecting hole in the second support member, thereby reducing the space occupied by the connecting hole on the second support member and improving the overall strength of the second support member.

[0025] In some embodiments, the dimension of the connecting portion in the thickness direction is d, and the dimension of the first support member in the thickness direction is D. d and D satisfy the relationship: 0.2D ≤ d ≤ 0.8D.

[0026] In the above solution, the dimension of the connecting portion in the thickness direction is defined as greater than or equal to 0.2D, so as to improve the connection strength between the first support member and the second support member, reduce the deformation of the connection between the first support member and the second support member under the impact of the electrode assembly, and improve the reliability of the battery cell. In the embodiments of the present application, the dimension of the connecting portion in the thickness direction is defined as less than or equal to 0.8D, so as to reduce the dimension of the connecting hole in the second support member, thereby reducing the space occupied by the connecting hole on the second support member and improving the overall strength of the second support member.

[0027] In some embodiments, a second concave portion is provided on the side of the second support member facing the main body portion. In the second direction, the projection of the end portion of the main body portion in the second direction overlaps with the projection of the second concave portion.

[0028] In the above solution, when the battery cell is subjected to an external impact, at least a part of the angular position of the electrode in the electrode assembly can move into the second concave portion. Due to the support of the second support member for the electrode assembly, the possibility of the angular position of the electrode in the electrode assembly coming into contact with and squeezing the second support member is reduced, and further the risk of the angular position of the electrode in the electrode assembly being crushed is reduced, thereby improving the reliability of the battery cell.

[0029] In a second aspect, the embodiments of the present application provide a battery device, including the battery cell in any of the foregoing embodiments.

[0030] In a third aspect, the embodiments of the present application provide an electrical device, including the battery device in any of the foregoing embodiments, and the battery device is used to provide electrical energy.

[0031] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0034] Figure 2 is an exploded structural diagram of a battery provided by an embodiment of the present application;

[0035] Figure 3 is a schematic structural diagram of a battery module provided by an embodiment of the present application;

[0036] Figure 4 is an exploded structural diagram of a battery cell provided by an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of a pole piece in a battery cell provided by an embodiment of the present application;

[0038] Figure 6 is a schematic structural diagram of a first support member and a second support member in a battery cell provided by an embodiment of the present application;

[0039] Figure 7 is another exploded structural diagram of a battery cell provided by an embodiment of the present application;

[0040] Figure 8 is a schematic cross-sectional structure diagram of a battery cell provided by an embodiment of the present application;

[0041] Figure 9 is Figure 8 an enlarged structural diagram of P in

[0042] Figure 10 is another schematic cross-sectional structure diagram of a battery cell provided by an embodiment of the present application;

[0043] Figure 11 is Figure 10 an enlarged structural diagram of Q in

[0044] Figure 12 is a schematic structural diagram of a first support member and a second support member in a battery cell provided by an embodiment of the present application;

[0045] Figure 13 is a schematic structural diagram of a first support member and a second support member in a battery cell provided by an embodiment of the present application.

[0046] Marking Explanation

[0047] 1000, Vehicle;

[0048] 100, Battery device; 200, Controller; 300, Motor; 400, Box; 410, First box part; 420, Second box part; 430, Accommodating part; 500, Battery module;

[0049] 110, Battery cell;

[0050] 10, Outer shell; 11, Housing; 111, First opening; 112, Second opening; 113, Bottom wall; 12, First end cover assembly; 13, Second end cover assembly;

[0051] 20, Electrode assembly; 21, Electrode tab; 211, Main body part; 212, Tab; 22, Second surface; 23, First corner;

[0052] 30, First support member; 31, First recess; 311, Bottom surface; 312, Side surface; 32, Channel; 33, First body part; 34, Connecting part; 35, First surface;

[0053] 40, Second support member; 41, Connecting hole; 42, Second recess;

[0054] X, First direction; Y, Second direction; Z, Thickness direction. Detailed Embodiment

[0055] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0057] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0058] Reference to "embodiment" in this document means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0060] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0061] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of this application.

[0062] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0063] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used after discharging by charging.

[0064] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0065] Generally, the battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through.

[0066] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0067] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0068] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with silver surface treatment, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0069] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a foam metal, a foam carbon, or a composite current collector. For example, as the metal foil, stainless steel with silver surface treatment, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, or foam alloy, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0072] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0073] As an example, the negative electrode active material can be the negative electrode active material for battery cells well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0074] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0075] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0076] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0077] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0078] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0079] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0080] In some embodiments, the electrode assembly is provided with tabs, and the tabs can lead the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0081] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0082] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0083] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0084] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0085] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0086] In some embodiments, the box body may be a part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0087] In some embodiments, the battery device may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0088] A battery cell generally includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is accommodated in the housing, and the electrode terminals are arranged on the housing. The electrode assembly includes tabs, and the tabs are electrically connected to the electrode terminals; the electrode terminals can be used to electrically connect the electrode assembly to a circuit outside the battery cell to realize charging or discharging of the battery cell.

[0089] When the battery cell is subjected to an external impact, the electrode assembly may vibrate in the housing, so that the corner positions of the electrode plates in the electrode assembly will be squeezed against the structure in the housing, resulting in the corner positions of the electrode plates in the electrode assembly being bruised, which affects the reliability of the battery cell.

[0090] Based on the above technical problems, the present application provides a technical solution, which supports the electrode assembly by arranging a first support member in the housing. When the battery cell is subjected to an external impact, at least part of the corner positions of the electrode plates in the electrode assembly can move into the first recess. Due to the support of the first support member for the electrode assembly, the possibility of the corner positions of the electrode plates in the electrode assembly coming into contact with and squeezing against the first support member is reduced, thereby reducing the risk of the corner positions of the electrode plates in the electrode assembly being bruised and improving the reliability of the battery cell.

[0091] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries. Electrical devices include, for example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecraft, electric toys, and electric tools, etc. Among them, spacecraft include, for example, airplanes, rockets, space shuttles, and spaceships, etc. Electric toys include, for example, fixed or mobile electric toys. Specifically, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. Specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0092] The battery cells described in the embodiments of this application are not limited to being applicable to the above-described electrical devices. However, for the sake of simplicity of description, the following embodiments will be described by taking an electric vehicle as an example.

[0093] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided by an embodiment of this application.

[0094] The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 100 can be provided inside the vehicle 1000. Specifically, for example, the battery device 100 can be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control, for example, the power supply of the battery to the motor 300. The battery can be used for starting, navigation, etc. of the vehicle 1000. Of course, the battery device 100 can also be used to drive the vehicle 1000 to travel, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0095] Figure 2 which is a schematic explosion structure diagram of a battery provided by an embodiment of this application. As Figure 2 shown, the battery device 100 includes a box body 400 and battery cells (not shown in the figure), and the battery cells are accommodated in the box body 400.

[0096] The housing 400 is used to accommodate battery cells, and the housing 400 can have various structures. In some embodiments, the housing 400 can include a first housing portion 410 and a second housing portion 420. The first housing portion 410 and the second housing portion 420 cover each other, and the first housing portion 410 and the second housing portion 420 jointly define a receiving portion 430 for accommodating battery cells. The second housing portion 420 can be a hollow structure with an open end, and the first housing portion 410 is a plate-like structure. The first housing portion 410 covers the open side of the second housing portion 420 to form a housing with the receiving portion 430. Both the first housing portion 410 and the second housing portion 420 can also be hollow structures with an open side, and the open side of the first housing portion 410 covers the open side of the second housing portion 420 to form the housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as a cylinder, a cuboid, etc.

[0097] In the battery device 100, there can be one or multiple battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells is accommodated in the housing 400. Of course, it can also be that multiple battery cells are first connected in series, in parallel, or in a hybrid connection to form battery modules 500, and then the multiple battery modules 500 are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the housing 400.

[0098] Figure 3 It is a schematic structural diagram of a battery module provided by an embodiment of the present application.

[0099] In some embodiments, as Figure 3 shown, there are multiple battery cells 110. The multiple battery cells 110 are first connected in series, in parallel, or in a hybrid connection to form battery modules 500. The multiple battery modules 500 are then connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the housing.

[0100] Figure 4 It is an exploded structural diagram of a battery cell provided by an embodiment of the present application. Figure 5 It is a schematic diagram of the electrode sheet in a battery cell provided by an embodiment of the present application. Figure 6 It is a schematic structural diagram of the first support member and the second support member in a battery cell provided by an embodiment of the present application.

[0101] Please refer to Figures 4 to 6, an embodiment of the present application provides a battery cell 110. The battery cell 110 includes a housing 10, an electrode assembly 20, and a first support member 30. The housing 10 includes a housing body 11 and a first end cap assembly 12. The housing body 11 has a first opening 111, and the first end cap assembly 12 covers the first opening 111. The electrode assembly 20 is accommodated in the housing 10. The electrode assembly 20 includes a plurality of electrode tabs 21. The electrode tab 21 includes a main body portion 211 and an electrode tab ear 212. The main body portion 211 is arranged along a first direction X with the first end cap assembly 12, and the electrode tab ear 212 extends from an end face of the main body portion 211 facing the end cap. The first support member 30 is located between the main body portion 211 and the first end cap assembly 12. A first recess 31 is provided on a side of the first support member 30 facing the main body portion 211. In the first direction X, a projection of an end portion of the main body portion 211 along a second direction Y overlaps with a projection of the first recess 31. The first direction X, the second direction Y, and a thickness direction Z of the battery cell 110 are perpendicular to each other.

[0102] The housing 10 is used to encapsulate components such as the electrode assembly 20 and the electrolyte. The housing 10 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing 10), or an aluminum plastic film, etc.

[0103] The housing 10 includes a housing body 11 and a first end cap assembly 12. The first end cap assembly 12 is used to close the first opening 111 of the housing body 11 to form an accommodation cavity with the housing body 11 for accommodating the electrode assembly 20 and the electrolyte solution.

[0104] The first end cap assembly 12 can also be used to electrically connect the electrode assembly 20 to a circuit outside the battery cell 110 to realize charging and discharging of the electrode assembly 20. Specifically, the first end cap assembly 12 can electrically connect the electrode tab ear 212 to an external circuit.

[0105] Optionally, the electrode assembly 20 includes a positive electrode tab 21 and a negative electrode tab 21. Exemplarily, the electrode assembly 20 generates electrical energy through oxidation and reduction reactions when ions are inserted into / extracted from the positive electrode tab 21 and the negative electrode tab 21.

[0106] Optionally, the electrode assembly 20 further includes a positive electrode tab ear 212 and a negative electrode tab ear 212. The positive electrode tab ear 212 electrically connects the positive electrode tab 21 to an external circuit, and the negative electrode tab ear 212 electrically connects the negative electrode tab 21 to an external circuit. Optionally, both the positive electrode tab ear 212 and the negative electrode tab ear 212 are electrically connected to the external circuit by the first end cap assembly 12.

[0107] Optionally, the electrode assembly 20 can be a stacked electrode assembly 20.

[0108] Exemplarily, the electrode assembly 20 includes a plurality of positive electrode plates 21 and a plurality of negative electrode plates 21, and the plurality of positive electrode plates 21 and the plurality of negative electrode plates 21 are alternately stacked. Each electrode plate 21 includes a main body portion 211 and a tab 212. The end of each main body portion 211 along the second direction Y can be understood as the corner portion of the edge of each main body portion 211 along the second direction Y. Exemplarily, when the projection shape of the main body portion 211 in the thickness direction Z is rectangular or a similar shape, the main body portion 211 includes four corner positions, and the ends of the main body portion 211 along the second direction Y can be two opposite corner positions of the main body portion 211 along the second direction Y. Optionally, the first recess 31 may penetrate through the first support member 30 in the thickness direction Z. After the plurality of positive electrode plates 21 and the plurality of negative electrode plates 21 are stacked, the ends of all the electrode plates 21 along the second direction Y are stacked to form an edge of the electrode assembly 20 that extends in the thickness direction Z and is opposite along the second direction Y, and the corner connected to the edge. Optionally, the edge of the electrode assembly 20 that extends in the thickness direction Z and is opposite along the second direction Y and the corner connected to the edge may be the first corner 23.

[0109] In the first direction X, the projection of the end of the main body portion 211 along the second direction Y overlaps with the projection of the first recess 31. It can be understood that the projection of the first corner 23 of the electrode assembly 20 along the first direction X overlaps with the projection of the first recess 31 along the first direction X. The "overlapping arrangement" here means that the projection of the first corner 23 along the first direction X and the projection of the first recess 31 completely overlap; or, the projection of the first corner 23 along the first direction X and the projection of the first recess 31 partially overlap; or, the projection of the first corner 23 along the first direction X is located within the projection of the first recess 31.

[0110] Optionally, the first recess 31 is formed by the depression of the surface of the first support member 30 facing the main body portion 211. Optionally, the first recess 31 may communicate with the edge of the first support member 30 along the second direction Y.

[0111] In the embodiment of the present application, the electrode assembly 20 is supported by arranging the first support member 30 in the housing 10. When the battery cell 110 is subjected to an external impact, at least a part of the corner position of the electrode plate 21 in the electrode assembly 20 can move into the first recess 31. Due to the support of the first support member 30 for the electrode assembly 20, the possibility of the corner position of the electrode plate 21 in the electrode assembly 20 coming into contact with and squeezing the first support member 30 is reduced, and further the risk of the corner position of the electrode plate 21 in the electrode assembly 20 being crushed is reduced, thereby improving the reliability of the battery cell 110.

[0112] In some optional embodiments, please refer to Figures 4 to 6 , the number of the first recesses 31 includes two, and the two first recesses 31 are respectively arranged at both ends of the first support member 30 along the second direction Y.

[0113] Optionally, the electrode assembly 20 includes two first corners 23, and one first corner 23 is correspondingly arranged with one first recess 31.

[0114] In the embodiment of the present application, through the above arrangement, the possibility that the corner position of the electrode plate 21 in the electrode assembly 20 contacts and presses against the first support member 30 is further reduced, thereby reducing the risk that the corner position of the electrode plate 21 in the electrode assembly 20 is bruised, and improving the reliability of the battery cell 110.

[0115] In some alternative embodiments, please refer to Figures 4 to 6 , the outer shell 10 further includes a second end cover assembly 13, the housing 11 further includes a second opening 112, the first opening 111 and the second opening 112 are oppositely arranged, and the second end cover assembly 13 covers the second opening 112. The number of the first support members 30 includes two, and the two first support members 30 are respectively disposed between the first end cover assembly 12 and the main body portion 211 and between the second end cover assembly 13 and the main body portion 211.

[0116] The first end cover assembly 12 is used to close the first opening 111 of the housing 11, and the second end cover assembly 13 is used to close the second opening 112 of the housing 11 to form a receiving cavity with the housing 11 for receiving the electrode assembly 20 and the electrolyte.

[0117] The second end cover assembly 13 can also be used to electrically connect the electrode assembly 20 to the circuit outside the battery cell 110 to realize the charge and discharge of the electrode assembly 20. Specifically, the second end cover assembly 13 can electrically connect the tab 212 to an external circuit.

[0118] Optionally, one of the positive tab 212 and the negative tab 212 is electrically connected to an external circuit by the first end cover assembly 12, and the other is electrically connected to an external circuit by the second end cover assembly 13.

[0119] In the embodiment of the present application, one of the two first support members 30 is located between the first end cover assembly 12 and the main body portion 211, and the other first support member 30 is located between the second end cover assembly 13 and the main body portion 211, so that the projections of the four corner positions of the electrode plate 21 along the first direction X are all located within the projection of the first recess 31 in the first support member 30 near the corner position along the first direction X, and the projections of the four first corners 23 extending along the thickness direction Z of the electrode assembly 20 along the first direction X are all located within the projection of the first recess 31 in the first support member 30 near the corner position along the first direction X, which is beneficial to further reduce the possibility that the corner position of the electrode plate 21 in the electrode assembly 20 contacts and presses against the first support member 30, thereby reducing the risk that the corner position of the electrode plate 21 in the electrode assembly 20 is bruised, and improving the reliability of the battery cell 110.

[0120] Figure 7 It is a schematic structural diagram of the explosion of another battery cell provided by an embodiment of the present application.

[0121] In some alternative embodiments, please refer to Figures 5 to 7 , the housing 11 includes a bottom wall 113 disposed opposite to the first end cap assembly 12, and the number of the first support members 30 is two. The two first support members 30 are respectively disposed between the first end cap assembly 12 and the main body portion 211 and between the bottom wall 113 and the main body portion 211.

[0122] Exemplarily, the housing 11 includes two first wall portions opposite to each other in the second direction Y and two second wall portions opposite to each other in the thickness direction Z. The two first wall portions, the two second wall portions and the bottom wall 113 enclose a receiving cavity having a first opening 111. After the first end cap assembly 12 covers the first opening 111, a receiving cavity for receiving the electrode assembly 20 and the electrolyte is formed.

[0123] In the embodiment of the present application, one of the two first support members 30 is located between the first end cap assembly 12 and the main body portion 211, and the other first support member 30 is located between the bottom wall 113 and the main body portion 211, so that the projections of the four corner positions of the electrode tab 21 in the first direction X are all located within the projection of the first recess 31 in the first support member 30 near the corner position, and the projections of the four first corner edges 23 extending in the thickness direction Z of the electrode assembly 20 in the first direction X are all located within the projection of the first recess 31 in the first support member 30 near the corner position, which is beneficial to further reduce the possibility that the corner position of the electrode tab 21 in the electrode assembly 20 contacts and presses against the first support member 30, and further reduce the risk that the corner position of the electrode tab 21 in the electrode assembly 20 is bruised, and improve the reliability of the battery cell 110.

[0124] Figure 8 It is a schematic cross-sectional structure diagram of a battery cell provided by an embodiment of the present application. Figure 9 It is Figure 8 An enlarged structural diagram of P in Figure 10 It is a schematic cross-sectional structure diagram of another battery cell provided by an embodiment of the present application. Figure 11 It is Figure 10 An enlarged structural diagram of Q in

[0125] In some alternative embodiments, please refer to Figures 8 to 11 , the first recess 31 includes a bottom surface 311 and a side surface 312, and the bottom surface 311 and the side surface 312 are connected by an arc transition; and / or, the first support member 30 includes a first surface 35 facing the main body portion 211, and the first surface 35 and the side surface 312 are connected by an arc transition.

[0126] In some embodiments, the bottom surface 311 and the side surface 312 are connected by an arc transition. In some other embodiments, the first surface 35 and the side surface 312 are connected by an arc transition. In still some other embodiments, the bottom surface 311 and the side surface 312 are connected by an arc transition, and the first surface 35 and the side surface 312 are connected by an arc transition.

[0127] In the embodiments of the present application, through the above settings, it is beneficial to further reduce the contact between the connection of the bottom surface 311 and the side surface 312 in the first recess 31 and the corner position of the pole piece 21 in the electrode assembly 20 to be smoother, thereby reducing the risk of the corner position of the pole piece 21 in the electrode assembly 20 being crushed and improving the reliability of the battery cell 110.

[0128] In some other embodiments, the bottom surface 311 and the first surface 35 are connected by multiple arc transitions.

[0129] In some alternative embodiments, the first support member 30 further includes an elastic portion, and the elastic portion is located on the side of the first support member 30 facing the main body portion 211.

[0130] Optionally, the first support member 30 may include a first body portion 33, a first recess 31 is provided on the first main body portion 211, the elastic portion is located on the side of the first body portion 33 facing the main body portion 211, and the elastic member can increase the depression depth of the first recess 31.

[0131] Optionally, a part of the elastic portion may also be located within the first recess 31.

[0132] In the embodiments of the present application, by providing the elastic portion, the buffering performance of the first support member 30 when the electrode assembly 20 contacts the first support member 30 is improved, and the possibility that the electrode assembly 20 is crushed due to the mutual extrusion of the electrode assembly 20 and the first support member 30 when the battery cell 110 is subjected to an external impact is reduced, thereby improving the reliability of the battery cell 110.

[0133] In some alternative embodiments, please refer to Figures 4 to 6 , the first support member 30 further includes a channel 32, the channel runs through the first support member 30, and the tab 212 passes through the channel 32 to be electrically connected to the first end cap assembly 12.

[0134] Optionally, the first support member 30 may be an integral structure or a split structure. Exemplarily, the first support member 30 may be formed by connecting a plurality of independently formed parts.

[0135] The channel 32 can be used to connect the space between the first support member 30 and the main body portion 211 to the space between the first support member 30 and the first end cap assembly 12, so that the tab 212 can be connected to the first end cap assembly 12.

[0136] The portion of the tab 212 received in the channel 32 and the channel may be an interference fit, a clearance fit, or a transition fit.

[0137] In an embodiment of the present application, the first support member 30 may insulate and isolate at least a portion of the tab 212 passing through the channel 32 from the main body portion 211. Thus, when the battery cell 110 is subjected to an external impact, the risk of the tab 212 being inserted into the main body portion 211 is reduced, the potential short - circuit hazard is reduced, and the safety is improved.

[0138] In some embodiments, the housing 10 includes a housing body 11, a first end - cap assembly 12, and a second end - cap assembly 13. The housing body 11 includes a first opening 111 and a second opening 112. A channel 32 may be provided on one of the two first support members 30, and the other first support member 30 may not be provided with a channel 32.

[0139] Exemplarily, the first end - cap assembly 12 includes a first end - cap and an insulating member. The insulating member is disposed on a side of the first end - cap facing the first support member 30. The second end - cap assembly 13 includes a second end - cap. The first support member 30 located between the second end - cap assembly 13 and the main body portion 211 is disposed on the second end - cap. In other words, the first support member 30 disposed on the second end - cap can serve as an insulating member.

[0140] Optionally, channels 32 may also be provided on both of the two first support members 30.

[0141] In some embodiments, the housing 10 includes a housing body 11 and a first end - cap assembly 12. The housing body 11 includes a first opening 111 and a bottom wall 113. A channel 32 may be provided on the first support member 30 located between the first end - cap assembly 12 and the main body portion 211, and the first support member 30 located between the bottom wall 113 and the main body portion 211 may not be provided with a channel 32.

[0142] In some alternative embodiments, please refer to Figures 4 to 6 , the battery cell 110 further includes a second support member 40. The electrode assembly 20 includes two second surfaces 22 opposite to each other along the second direction Y. The second support member 40 is located between the second surface 22 and the housing body 11.

[0143] Optionally, the second support member 40 is located between the second surface 22 and the first wall portion of the housing 10.

[0144] Optionally, the second support member 40 may be fixedly connected to the first support member 30. Of course, the second support member 40 may also be separated from the first support member 30.

[0145] In the embodiments of the present application, when the electrode assembly 20 is installed in the housing 10, there is a gap between the electrode assembly 20 and the housing 10. By providing the second support member 40, it is beneficial to make the electrode assembly 20 located in the middle area of the housing 10, thereby reducing the possibility that the tab 212 in the electrode assembly 20 is pulled or even torn when the battery cell 110 is impacted due to excessive movement of the electrode assembly 20 in the housing 10.

[0146] Figure 12 It is a schematic structural diagram of a first support member and a second support member in a battery cell provided by an embodiment of the present application.

[0147] In some alternative embodiments, please refer to Figure 6 and Figure 12 , the first support member 30 includes a first body portion 33 and a connecting portion 34, and the connecting portion protrudes from one side of the first body portion 33 along the second direction Y. The second support member 40 is provided with a connecting hole 41, and at least a part of the connecting portion 34 is located in the connecting hole 41.

[0148] Optionally, one or more connecting portions 34 may be provided on one side of the first body portion 33 along the second direction Y.

[0149] Optionally, connecting portions 34 are provided on both opposite sides of the first body portion 33 along the second direction Y, so that one first support member 30 is fixedly connected to both second support members 40.

[0150] Optionally, the thickness of the connecting portion 34 may be less than the thickness of the first body portion 33. After the second support member 40 and the connecting portion 34 are connected together, a part of the connecting portion 34 may be connected to the second support member 40, and another part of the connecting portion 34 forms the bottom wall 113 of the first recess 31. Of course, the first recess 31 may also be provided on the first body portion 33.

[0151] Optionally, an interference fit, a clearance fit or a transition fit may be provided between the connecting hole 41 and the connecting portion 34.

[0152] Optionally, the connecting hole 41 includes one or a combination of a circular hole, an oval hole and a waist-shaped hole.

[0153] Optionally, the shape of the connecting portion 34 is matched with the shape of the connecting hole 41. For example, when the connecting hole 41 is a circular hole, the connecting portion 34 is cylindrical; when the connecting hole 41 is a waist-shaped hole, the connecting portion 34 is strip-shaped.

[0154] In some embodiments, the whole of the connecting portion 34 is located in the connecting hole 41. In other embodiments, a part of the connecting portion 34 is located in the connecting hole 41, and another part of the connecting portion 34 is located outside the connecting hole 41.

[0155] In these alternative embodiments, the first support member 30 and the second support member 40 are fixedly connected by providing the connection holes 41 and the connection holes, which helps to simplify the connection method between the first support member 30 and the second support member 40 and improve production efficiency.

[0156] In some alternative embodiments, referring to Figure 12 , the dimension of the connecting portion 34 in the first direction X is h, and the dimension of the first support member 30 in the first direction X is H, and h and H satisfy the relationship: 0.2H ≤ h ≤ 0.8H.

[0157] Optionally, the relationship between the dimension h of the connecting portion 34 in the first direction X and the dimension H of the first support member 30 in the first direction X may include h = 0.2H, h = 0.3H, h = 0.4H, h = 0.5H, h = 0.6H, h = 0.7H or h = 0.8H.

[0158] Optionally, the dimension of the first support member 30 in the first direction X may be the dimension between the surface of the first support member 30 facing the main body portion 211 and the surface of the first support member 30 facing away from the main body portion 211. Alternatively, the first support member 30 includes a first main body portion 33 and an extension portion, the extension portion forms the bottom wall 113 of the concave portion, and the connecting portion 34 is connected to the first main body portion 33 through the extension portion, and the dimension of the first support member 30 in the first direction X may also be the dimension of the extension portion in the first direction X.

[0159] In the embodiments of the present application, the dimension of the connecting portion 34 in the first direction X is limited to be greater than or equal to 0.2H to improve the connection strength between the first support member 30 and the second support member 40, reduce the deformation of the connection between the first support member 30 and the second support member 40 under the impact of the electrode assembly 20, and improve the reliability of the battery cell 110. In the embodiments of the present application, the dimension of the connecting portion 34 in the first direction X is limited to be less than or equal to 0.8H to reduce the dimension of the connection hole 41 in the second support member 40, thereby reducing the space occupied by the connection hole 41 on the second support member 40 and improving the overall strength of the second support member 40.

[0160] In some alternative embodiments, referring to Figure 12 , the dimension of the connecting portion 34 in the thickness direction Z is d, and the dimension of the first support member 30 in the thickness direction Z is D, and d and D satisfy the relationship: 0.2D ≤ d ≤ 0.8D.

[0161] Optionally, the relationship between the dimension d of the connecting portion 34 in the thickness direction Z and the dimension D of the first support member 30 in the thickness direction Z may include d = 0.2D, d = 0.3D, d = 0.4D, d = 0.5D, d = 0.6D, d = 0.7D or d = 0.8D.

[0162] In the embodiments of the present application, the dimension of the connecting portion 34 in the thickness direction Z is defined as greater than or equal to 0.2D to improve the connection strength between the first support member 30 and the second support member 40, reduce the deformation of the connection between the first support member 30 and the second support member 40 under the impact of the electrode assembly 20, and improve the reliability of the battery cell 110. In the embodiments of the present application, the dimension of the connecting portion 34 in the thickness direction Z is defined as less than or equal to 0.8D to reduce the size of the connection hole 41 in the second support member 40, thereby reducing the space occupied by the connection hole 41 on the second support member 40 and improving the overall strength of the second support member 40.

[0163] Figure 13 It is a schematic structural view of the first support member and the second support member in a battery cell provided by the embodiments of the present application.

[0164] In some optional embodiments, please refer to Figure 13 , a second recess 42 is provided on the side of the second support member 40 facing the main body portion 211. In the second direction Y, the projection of the end portion of the main body portion 211 along the second direction overlaps with the projection of the second recess 42.

[0165] Optionally, the second support member 40 may include an intermediate region and an end region. The second recess 42 and the connection hole 41 are both located in the end region, and the connection hole is located on the side of the second recess 42 facing away from the intermediate region.

[0166] Optionally, the first recess 31 and the second recess 42 communicate with each other. In other words, the recessed spaces of the first recess 31 and the second recess 42 can enclose a large recessed space.

[0167] In the second direction Y, the projection of the end portion of the main body portion 211 along the second direction overlaps with the projection of the second recess 42. It can be understood that the projection of the first corner 23 of the electrode assembly 20 along the second direction Y overlaps with the projection of the second recess 42 along the second direction Y. Here, "overlapping arrangement" means that the projection of the first corner 23 along the second direction Y and the projection of the second recess 42 completely overlap; or, the projection of the first corner 23 along the second direction Y and the projection of the second recess 42 partially overlap; or, the projection of the first corner 23 along the second direction Y is located within the projection of the second recess 42.

[0168] In these optional embodiments, when the battery cell 110 is subjected to an external impact, at least a part of the corner position of the electrode plate 21 in the electrode assembly 20 can move into the second recess 42. Due to the support of the second support member 40 for the electrode assembly 20, the possibility that the corner position of the electrode plate 21 in the electrode assembly 20 contacts and presses against the second support member 40 is reduced, thereby reducing the risk that the corner position of the electrode plate 21 in the electrode assembly 20 is bruised and improving the reliability of the battery cell 110.

[0169] In some alternative embodiments, please refer to Figure 8 , the dimension of the first support member 30 in the second direction Y is L1, the dimension of the first recess 31 in the second direction Y is L2, and L1 and L2 satisfy the relationship: 2 mm ≤ L2 ≤ 0.5L1.

[0170] Optionally, L1 > 4 mm.

[0171] Optionally, the recess depth of the first recess 31 in the first direction X is L3, and 1 mm ≤ L3 ≤ 5 mm.

[0172] Exemplarily, the recess depth of the first recess 31 is 1 mm, 2 mm, 3 mm, 4 mm or 5 mm.

[0173] Optionally, the thickness of the second support member 40 can include 0.5 mm to 3 mm.

[0174] In the embodiments of the present application, the recess depth of the first recess 31 is defined as greater than or equal to 2 mm to increase the space into which the electrode assembly 20 can extend into the first recess 31, reduce the possibility of mutual extrusion between the electrode assembly 20 and the bottom surface 311 and the side surface 312 of the first recess 31, and improve the reliability of the battery cell 110. In the embodiments of the present application, the recess depth of the first recess 31 is defined as less than or equal to 0.5L1 to reduce the space occupied by the first recess 31 on the first support member 30 and improve the overall strength of the first support member 30.

[0175] In a second aspect, an embodiment of the present application provides a battery device 100, including the battery cell 110 in any of the foregoing embodiments.

[0176] In a third aspect, an embodiment of the present application provides an electrical device, including the battery device 100 in any of the foregoing embodiments, and the battery device is used to provide electrical energy.

[0177] According to some embodiments of the present application, please refer to Figures 4 to 9, the battery cell 110 includes a housing 10, an electrode assembly 20, and a first support member 30. The housing 10 includes a housing body 11 and a first end cap assembly 12. The housing body has a first opening 111, and the first end cap assembly 12 covers the first opening 111. The electrode assembly 20 is accommodated in the housing 10. The electrode assembly includes a plurality of electrode tabs 21. The electrode tab includes a main body portion 211 and an electrode tab 212. The main body portion is arranged along the first direction X with the first end cap assembly 12, and the electrode tab 212 extends from the end face of the main body portion 211 facing the end cap. The first support member 30 is located between the main body portion 211 and the first end cap assembly 12. A first recess 31 is provided on the side of the first support member 30 facing the main body portion 211. In the first direction X, the projection of the end of the main body portion 211 along the second direction Y overlaps with the projection of the first recess 31. The first direction X, the second direction Y, and the thickness direction Z of the battery cell 110 are perpendicular to each other.

[0178] The number of the first recesses 31 is two, and the two first recesses 31 are respectively arranged at both ends of the first support member 30 along the second direction Y. The housing 10 further includes a second end cap assembly 13. The housing body 11 further includes a second opening 112. The first opening 111 and the second opening are oppositely arranged, and the second end cap assembly 13 covers the second opening 112. The number of the first support members 30 is two, and the two first support members 30 are respectively arranged between the first end cap assembly 12 and the main body portion 211 and between the second end cap assembly 13 and the main body portion 211. The first recess 31 includes a bottom surface 311 and a side surface 312, and the bottom surface and the side surface are connected by an arc transition. And / or, the first support member 30 includes a first surface 35 on the side facing the main body portion 211, and the first surface and the side surface 312 are connected by an arc transition. The first support member 30 further includes a channel 32, and the channel penetrates through the first support member 30. The electrode tab 212 passes through the channel 32 and is electrically connected to the first end cap assembly 12.

[0179] The battery cell 110 further includes a second support member 40. The electrode assembly 20 includes two second surfaces 22 opposite to each other along the second direction Y. The second support member 40 is located between the second surface 22 and the housing body 11. The first support member 30 includes a first main body portion 33 and a connecting portion 34, and the connecting portion protrudes from one side of the first main body portion 33 along the second direction Y. The second support member 40 is provided with a connecting hole 41, and at least a part of the connecting portion 34 is located in the connecting hole 41.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features 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 that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, including a housing body and a first end cap assembly, the housing body having a first opening, and the first end cap assembly covering the first opening; An electrode assembly, accommodated in the housing, the electrode assembly including a plurality of electrode tabs, the electrode tabs including a main body portion and a tab, the main body portion being arranged along a first direction with the first end cap assembly, and the tab extending from an end face of the main body portion facing the end cap; A first support member, located between the main body portion and the first end cap assembly, a first concave portion being provided on a side of the first support member facing the main body portion, and in the first direction, a projection of an end portion of the main body portion along a second direction overlapping with a projection of the first concave portion, the first direction, the second direction, and a thickness direction of the battery cell being perpendicular to each other.

2. The battery cell according to claim 1, characterized in that, The number of the first concave portions is two, and the two first concave portions are respectively arranged at two ends of the first support member along the second direction.

3. The battery cell according to claim 1, characterized in that, The housing further includes a second end cap assembly, the housing body further includes a second opening, the first opening and the second opening being oppositely arranged, and the second end cap assembly covering the second opening; The number of the first support members is two, and the two first support members are respectively arranged between the first end cap assembly and the main body portion and between the second end cap assembly and the main body portion.

4. The battery cell according to claim 1, wherein The housing body includes a bottom wall opposite to the first end cap assembly, the number of the first support members is two, and the two first support members are respectively arranged between the first end cap assembly and the main body portion and between the bottom wall and the main body portion.

5. The battery cell according to claim 1, characterized in that, The first concave portion includes a bottom surface and a side surface, and the bottom surface and the side surface are connected by an arc transition; And / or, the first support member includes a first surface on a side facing the main body portion, and the first surface and the side surface are connected by an arc transition.

6. The battery cell according to claim 1, characterized in that, The first support member further includes an elastic portion, and the elastic portion is located on a side of the first support member facing the main body portion.

7. The battery cell according to claim 1, characterized in that, The first support member further includes a channel, the channel penetrating through the first support member, and the tab passing through the channel and being electrically connected to the first end cap assembly.

8. The battery cell according to claim 7, characterized in that, The battery cell further includes a second support member, the electrode assembly includes two second surfaces opposite to each other along the second direction, and the second support member is located between the second surface and the housing body.

9. The battery cell according to claim 8, characterized in that, The first support member includes a first body portion and a connecting portion, the connecting portion protruding from a side of the first body portion along the second direction; the second support member is provided with a connecting hole, and at least a part of the connecting portion is located in the connecting hole.

10. The battery cell according to claim 9, characterized in that, A dimension of the connecting portion along the first direction is h, a dimension of the first support member along the first direction is H, and h and H satisfy the relationship: 0.2H ≤ h ≤ 0.8H.

11. The battery cell according to claim 9, characterized in that, A dimension of the connecting portion along the thickness direction is d, a dimension of the first support member along the thickness direction is D, and d and D satisfy the relationship: 0.2D ≤ d ≤ 0.8D.

12. The battery cell according to claim 8, wherein, A second concave portion is provided on a side of the second support member facing the main body portion, and in the second direction, a projection of an end portion of the main body portion along the second direction overlaps with a projection of the second concave portion.

13. A battery device, characterized in that, Comprising a battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that, Comprising a battery device according to claim 13, the battery device being configured to provide electrical energy.

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