Battery monomer, battery device and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell which comprises two first side walls which are oppositely arranged; the roll core is located in the shell, and the two opposite sides of the roll core are arc-shaped side faces protruding outwards respectively; the profiling supporting piece is connected with the shell, the profiling supporting piece is arranged between the arc-shaped side face of at least one side of the roll core and the first side wall, the profiling supporting piece surrounds the arc-shaped side face, and the profiling supporting piece and the arc-shaped side face are attached to each other in a surface contact mode. The battery monomer can effectively reduce the expansion deformation of the roll core in the charging and discharging process, and reduce the generation of structural problems.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery cells, battery devices, and electrical devices. Background Art

[0002] A battery device generally includes a battery box and battery cells located inside the battery box. A battery cell includes a housing and a wound core disposed inside the housing. The wound core is made by winding stacked positive electrode sheets, separator membranes, and negative electrode sheets and then thermally compounding them.

[0003] During the charge and discharge process of the wound core, the transmission of lithium ions is accompanied by a series of chemical and physical reactions, resulting in the expansion and deformation of the electrode sheets, and thus the entire wound core will expand and deform, which easily causes various structural problems. Summary of the Utility Model

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which can effectively reduce the expansion and deformation generated by the wound core during the charge and discharge process and reduce the occurrence of structural problems.

[0005] In a first aspect, this application provides a battery cell, which includes:

[0006] A housing, the housing includes two first side walls oppositely arranged along a first direction;

[0007] A wound core, the wound core is located inside the housing, and both sides of the wound core along the first direction are outwardly convex arc-shaped side surfaces, and the first direction is the relative direction of the two first side walls; and

[0008] A profiling support sheet, the profiling support sheet is connected to the housing, and a profiling support sheet is provided between the arc-shaped side surface of at least one side of the wound core and the first side wall. The profiling support sheet surrounds the arc-shaped side surface, and the profiling support sheet and the arc-shaped side surface are attached to each other in a surface-contact manner.

[0009] For the above battery cell, a profiling support sheet is provided between the arc-shaped side surface of the wound core and the first side wall of the housing, and the profiling support sheet is connected to the housing. Therefore, the profiling support sheet can support the arc-shaped side surface of the wound core. Since the profiling support sheet surrounds the arc-shaped side surface and the profiling support sheet and the arc-shaped side surface are attached to each other in a surface-contact manner, the profiling support sheet can provide uniform and stable support for the arc-shaped side surface of the wound core, and thus can effectively reduce the expansion and deformation generated by the wound core during the charge and discharge process and reduce the occurrence of structural problems.

[0010] In an embodiment, the battery cell further includes a cover body, an explosion-proof valve is provided on the cover body, the cover body covers an opening at one end of the housing along a third direction, and is connected to the housing, and the third direction is the height direction of the battery cell;

[0011] The profiling support sheet is provided with exhaust grooves; the first side wall is a flat structure, and an exhaust space communicating with the exhaust grooves is formed between the first side wall and the profiling support sheet, so that air flow can flow to the explosion-proof valve through the exhaust space.

[0012] In this embodiment, when the temperature and pressure inside the housing increase, the gas can enter the exhaust space through the exhaust grooves and flow along the third direction towards the cover body in the exhaust space, so that the gas can be exhausted and the pressure can be relieved through the explosion-proof valve provided on the cover body. It can be seen that the technical solution of this embodiment adds an exhaust space for the gas inside the housing, facilitating the rapid exhaust and pressure relief of the battery cell.

[0013] In one embodiment, one side of the profiling support sheet facing away from the arc-shaped side surface along the first direction is in tangential contact with the first side wall.

[0014] Since one side of the profiling support sheet facing away from the arc-shaped side surface along the first direction is in tangential contact with the first side wall, the profiling support sheet can be supported by the first side wall along the first direction, thereby improving the support strength for the wound core along the first direction and further effectively reducing the expansion deformation of the wound core during charge and discharge.

[0015] In one embodiment, the tangential contact position between the profiling support sheet and the first side wall divides the exhaust space into a plurality of adjacent sub-spaces in sequence; two adjacent sub-spaces are connected through the exhaust grooves.

[0016] Since the tangential contact position between the profiling support sheet and the first side wall divides the exhaust space into a plurality of adjacent sub-spaces in sequence, and two adjacent sub-spaces are connected through the exhaust grooves, the gas can flow between two adjacent sub-spaces on both sides of the above-mentioned tangential contact position, enhancing the smoothness of the gas flow, and thus facilitating the rapid exhaust and pressure relief of the battery cell.

[0017] In one embodiment, the extending direction of the exhaust grooves is consistent with the surrounding direction of the profiling support sheet for the arc-shaped side surface, which is convenient for processing the exhaust grooves.

[0018] In one embodiment, the profiling support sheet is provided with a plurality of exhaust grooves arranged at intervals along the third direction.

[0019] In this embodiment, by providing a plurality of exhaust grooves arranged at intervals along the third direction on the profiling support sheet, the fluidity of the gas inside the housing can be enhanced, facilitating the rapid exhaust and pressure relief of the battery cell.

[0020] In one embodiment, the housing further includes two second side walls oppositely arranged along the second direction, and each second side wall is connected to two first side walls respectively on both sides along the first direction;

[0021] Both sides of the wound core along the second direction are flat side surfaces, and the second direction is the relative direction of the two second side walls;

[0022] The battery cell further includes an extension piece; along the surrounding direction of the arc-shaped side surface by the profiling support piece, the extension piece has a first side close to the profiling support piece and a second side far from the profiling support piece. The first side is connected to one side of the profiling support piece along the surrounding direction, and the second side is located between the second side wall and the flat side surface.

[0023] Since from the first side of the extension piece to the second side, the extension piece extends from one side of the profiling support piece to between the second side wall and the flat side surface, that is, the second side is located on one side of the winding core along the second direction, the extension piece and the profiling support piece can jointly play a binding role on the winding core from the first direction and the second direction, which is beneficial to maintaining good contact between the positive electrode sheet, the separator, and the negative electrode sheet of the winding core.

[0024] In one embodiment, extension pieces are respectively provided between the two second side walls and the winding core.

[0025] Since extension pieces are respectively provided between the two second side walls and the winding core, the two second side walls can keep gaps with the winding core respectively through the corresponding extension pieces, making it more convenient to install the winding core into the housing. Moreover, the extension pieces between the two second side walls and the winding core can respectively play a binding role on both sides of the winding core, further enabling good contact to be maintained between the positive electrode sheet, the separator, and the negative electrode sheet of the winding core.

[0026] In one embodiment, the second side is connected to the second side wall.

[0027] By connecting the second side of the extension piece to the second side wall, the connection stability of the extension piece can be enhanced.

[0028] In one embodiment, the second side of the extension piece is welded or bonded to the second side wall.

[0029] In one embodiment, the surrounding angle of the arc-shaped side surface by the profiling support piece is less than 180°;

[0030] In the direction from the first side to the second side, the extension piece inclines towards the second side wall, so that the connection between the extension piece and the profiling support piece has a smooth transition.

[0031] From the end where the extension piece is connected to the profiling support piece to the other end, the extension piece inclines towards the side wall of the housing, facilitating a smooth transition at the connection between the extension piece and the profiling support piece.

[0032] In this embodiment, since the surrounding angle of the arc-shaped side surface by the profiling support piece is less than 180°, in the direction from the first side to the second side, the extension piece inclines towards the second side wall, thus facilitating a smooth transition at the connection between the extension piece and the profiling support piece and reducing or avoiding stress concentration.

[0033] In one embodiment, the extension piece extends in an arc from the first side to the second side.

[0034] Since the profiling support piece is arc-shaped and the extension piece is also arc-shaped, the extension of the extension piece from the first side to the second side can be gradually and smoothly transitioned.

[0035] In one embodiment, the extension piece has a flat sheet-like structure.

[0036] In one embodiment, the extension piece includes an integrally formed first part and a second part, and the connection between the first part and the second part is smoothly transitioned;

[0037] The first part is located between the arc-shaped side surface and the second side wall, and the second part is located between the flat side surface and the second side wall.

[0038] By the smooth transition at the connection between the first part and the second part, stress concentration can be reduced or avoided.

[0039] In one embodiment, profiling support pieces are respectively provided between the two arc-shaped side surfaces on both sides of the winding core in the first direction and the two first side walls.

[0040] By respectively providing profiling support pieces between the two arc-shaped side surfaces on both sides of the winding core in the first direction and the two first side walls, the profiling support pieces located on both sides of the winding core can respectively provide support for the winding core, and thus the expansion deformation generated by the winding core during charge and discharge can be more effectively reduced.

[0041] In one embodiment, the number of winding cores is multiple; the arrangement direction of the multiple winding cores is perpendicular to the first direction;

[0042] A profiling support piece is provided between the arc-shaped side surface of at least one side of each winding core in the first direction and the first side wall.

[0043] The number of winding cores is multiple. By providing profiling support pieces between the arc-shaped side surfaces of at least one side of each winding core and the first side wall, the expansion deformation of each winding core can be effectively reduced.

[0044] In one embodiment, the multiple profiling support pieces located on the same side of the multiple winding cores are connected to each other.

[0045] Since the multiple profiling support pieces located on the same side of the multiple winding cores are connected to each other, after the multiple profiling support pieces located on the same side of the multiple winding cores are connected to each other, they can be loaded into the housing, which is convenient for connection. Moreover, the multiple profiling support pieces located on the same side of the multiple winding cores are connected to each other, which can improve the support stability of the profiling support pieces.

[0046] In a second aspect, the present application provides a battery device, including a battery box and any one of the battery monomers in the above embodiments, and the battery monomer is located in the battery box.

[0047] In the above battery device, a profiling support piece is arranged between the arc-shaped side surface of the winding core and the first side wall of the housing, and the profiling support piece is connected to the housing. Therefore, the profiling support piece can support the arc-shaped side surface of the winding core. Since the profiling support piece surrounds the arc-shaped side surface, the profiling support piece and the arc-shaped side surface are attached to each other in a surface-contact manner, so that the profiling support piece can provide uniform and stable support for the arc-shaped side surface of the winding core, and thus can effectively reduce the expansion deformation generated by the winding core during charging and discharging, and reduce the occurrence of structural problems.

[0048] In a third aspect, the present application provides an electrical device, including the battery device in the above embodiment, and the battery device is used to provide electrical energy for the electrical device.

[0049] In the above electrical device, a profiling support piece is arranged between the arc-shaped side surface of the winding core and the first side wall of the housing, and the profiling support piece is connected to the housing. Therefore, the profiling support piece can support the arc-shaped side surface of the winding core. Since the profiling support piece surrounds the arc-shaped side surface, the profiling support piece and the arc-shaped side surface are attached to each other in a surface-contact manner, so that the profiling support piece can provide uniform and stable support for the arc-shaped side surface of the winding core, and thus can effectively reduce the expansion deformation generated by the winding core during charging and discharging, and reduce the occurrence of structural problems.

[0050] The above description is only an overview of the technical solution 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 description. 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0052] Figure 1 It is a schematic structural diagram of a vehicle according to some embodiments of the present application.

[0053] Figure 2 It is an exploded structural diagram of a battery device according to some embodiments of the present application.

[0054] Figure 3 It is an exploded structural diagram of a battery cell according to some embodiments of the present application.

[0055] Figure 4 It is a schematic connection structure diagram of the housing and the profiling support piece of a battery cell according to some embodiments of the present application.

[0056] Figure 5 Schematic diagram of the connection structure between the housing (the cover is not shown) of the battery cell and the profiling support sheet for some embodiments of the present application.

[0057] Figure 6 is Figure 5 The partial enlarged view of area A in

[0058] The reference numerals in the accompanying drawings in the specific embodiments are as follows:

[0059] 1. Vehicle; 10. Battery device; 20. Controller; 30. Motor; 100. Battery box; 110. Box body; 120. Upper cover; 200. Battery cell; 210. Housing; 211. Shell; 211a. First side wall; 211b. Second side wall; 212. Cover; 212a. Electrode terminal; 220. Winding core; 221. Arc-shaped side; 222. Straight side; 230. Profiling support sheet; 231. Exhaust groove; 201. Exhaust space; 240. Explosion-proof valve; 250. Extension piece; 250a. First side; 250b. Second side; 251. First part; 252. Second part. Specific embodiments

[0060] 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 illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0061] 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 drawings are intended to cover non-exclusive inclusion.

[0062] 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" means more than two unless otherwise specifically defined.

[0063] Reference to "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] 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 three relationships can exist. 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.

[0065] In the description of the embodiments of this application, the term "plural" 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).

[0066] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "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 understood as a limitation to the embodiments of this application.

[0067] 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.

[0068] Currently, from the perspective of the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of battery devices, the market demand for them is also continuously increasing.

[0069] A battery device generally includes a battery box and battery cells located within the battery box. Each battery cell includes a housing and a wound core disposed within the housing. The wound core is formed by winding stacked positive electrode sheets, separator sheets, and negative electrode sheets and then thermally compounding them.

[0070] During the charge and discharge process of the wound core, the transmission of lithium ions is accompanied by a series of chemical and physical reactions, which cause the electrode sheets to expand and deform, resulting in the entire wound core expanding and deforming, and easily triggering various structural problems. For example, it may cause the housing to bulge, and may also increase the risk of internal short circuit within the battery cell. In severe cases, it may even trigger safety accidents such as thermal runaway.

[0071] Based on the above considerations, in order to solve the problem that the wound core of the battery cell in the related art expands and deforms during the charge and discharge process, this application designs a battery cell. A profiling support sheet is provided between the arc-shaped side surface of the wound core and the first side wall of the housing. The profiling support sheet is in surface contact with the arc-shaped side surface and fits each other, so that the profiling support sheet can provide uniform and stable support for the arc-shaped side surface of the wound core, thereby effectively reducing the expansion and deformation of the wound core during the charge and discharge process and reducing the occurrence of structural problems.

[0072] The battery device disclosed in the embodiments of this application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical device can be, but is not limited to, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys. For example, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. By using the battery device disclosed in this application to form the power supply system of the electrical device, the weight of the battery device can be reduced.

[0073] For the convenience of description in the following embodiments, a vehicle 1, which is an electrical device of some embodiments of this application, is taken as an example for illustration.

[0074] Please refer to Figure 1 , Figure 1 , which shows a schematic structural diagram of the vehicle 1 provided by some embodiments of this application. The vehicle 1 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 10 is provided inside the vehicle 1. The battery device 10 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as the operating power source of the vehicle 1. The vehicle 1 may further include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0075] In some embodiments of the present application, the battery device 10 can not only serve as the operating power source of the vehicle 1, but also as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0076] Please refer to Figure 2 , Figure 2 which is an exploded view of the battery device provided in some embodiments of the present application. The battery device 10 includes a battery box 100 and battery cells 200. The battery cells 200 are accommodated in the battery box 100. Among them, the battery box 100 is used to provide an accommodation space for the battery cells 200, and the battery box can adopt various structures. In some embodiments, the battery box 100 may include an upper cover 120 and a box body 110. The upper cover 120 and the box body 110 are covered with each other, and the upper cover 120 and the box body 110 jointly define an accommodation cavity for accommodating the battery cells 200. The box body 110 may be a hollow structure with one end open, and the upper cover 120 may be a plate-like structure. The upper cover 120 is covered on the open side of the box body 110 so that the upper cover 120 and the box body 110 jointly define the accommodation cavity; the upper cover 120 and the box body 110 may also both be hollow structures with one side open, and the open side of the upper cover 120 is covered on the open side of the box body 110. Of course, the battery box 100 formed by the upper cover 120 and the box body 110 can be of various shapes, such as a cylinder, a cuboid, etc.

[0077] In the battery device 10, there may be multiple battery cells 200. The multiple battery cells 200 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 200. The multiple battery cells 200 can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 200 is accommodated in the battery box 100; of course, the battery device 10 can also be that multiple battery cells 200 are first connected in series, in parallel, or in a hybrid connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the battery box 100. The battery device may further include other structures. For example, the battery device may further include a busbar component for realizing the electrical connection among the multiple battery cells 200.

[0078] Among them, each battery cell 200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but not limited thereto. The battery cell 200 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0079] Please refer to Figure 3 , Figure 3 which shows Figure 2 an exploded view of the battery cell 200 shown. The battery cell 200 refers to the smallest unit that makes up the battery device 10. As Figure 3, the battery cell 200 includes a housing 210, a winding core 220, and other functional components. The housing 210 includes a casing 211 and a cover 212.

[0080] The cover 212 refers to a component that covers the opening of the casing 211 to isolate the internal environment of the battery cell 200 from the external environment. Without limitation, the shape of the cover 212 can be adapted to the shape of the casing 211 to fit the casing 211. Optionally, the cover 212 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the cover 212 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 200 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 212a can be provided on the cover 212. The electrode terminals 212a can be used to electrically connect to the winding core 220 for outputting or inputting the electrical energy of the battery cell 200. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 200 reaches a threshold, such as an explosion-proof valve, can also be provided on the cover 212. In some embodiments, the material of the cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the cover 212, and the insulating structure can be used to isolate the electrical connection components in the casing 211 from the cover 212 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0081] The casing 211 is a component for cooperating with the cover 212 to form the internal environment of the battery cell 200, wherein the formed internal environment can be used to accommodate the winding core 220, the electrolyte, and other components. The casing 211 and the cover 212 can be independent components. An opening can be provided on the casing 211, and the cover 212 is covered on the opening to form the internal environment of the battery cell 200. Without limitation, the cover 212 and the casing 211 can also be integrated. Specifically, the cover 212 and the casing 211 can first form a common connection surface before other components are put into the casing, and then the cover 212 is covered on the casing 211 when the inside of the casing 211 needs to be encapsulated. The material of the casing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0082] The core 220 refers to a wound battery cell, which is a component in the battery cell 200 where electrochemical reactions occur. The housing 211 may contain one or more cores 220. The core 220 is made by winding and then thermally compounding a stacked positive electrode sheet, separator, and negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the core 220, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery device 10, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals 212a to form a current loop.

[0083] Figure 4 The schematic diagram of the connection structure between the outer shell (the third side wall is not shown) of the battery cell and the profiling support sheet in some embodiments of the present application is shown. Figure 5 The schematic diagram of the connection structure between the outer shell (the cover body is not shown) of the battery cell and the profiling support sheet in some embodiments of the present application is shown. Figure 6 Shows Figure 5 The partial enlarged view of area A in

[0084] Please refer to Figures 3 to 5 A battery cell 200 provided by an embodiment of the present application includes a housing 211, a core 220, and a profiling support sheet 230.

[0085] For the convenience of describing the technical solution of the present application below, the first direction XX', the third direction ZZ', and the second direction YY' are used to describe the orientation. Optionally, the first direction XX', the third direction ZZ', and the second direction YY' are perpendicular to each other in pairs.

[0086] The housing 211 includes two first side walls 211a oppositely arranged along the first direction XX'. The core 220 is located inside the housing 211, and the two sides of the core 220 along the first direction XX' are respectively outwardly convex arc-shaped side surfaces 221. The first direction XX' is the relative direction of the two first side walls 211a.

[0087] The profiling support sheet 230 is connected to the housing 211. A profiling support sheet 230 is provided between the arc-shaped side surface 221 on at least one side of the core 220 and the first side wall 211a. The profiling support sheet 230 surrounds the arc-shaped side surface 221, and the profiling support sheet 230 and the arc-shaped side surface 221 are in surface contact with each other.

[0088] It can be understood that the core 220 is made by winding and then thermally compounding a stacked positive electrode sheet, separator, and negative electrode sheet. Therefore, as Figure 3As shown, after winding is completed, convex arc-shaped side surfaces 221 are respectively formed on both sides of the core 220 along the first direction XX', and flat side surfaces 222 are respectively formed on the opposite sides of the core 220 along the second direction YY'.

[0089] The material used for the profiling support piece 230 can be the same as or different from the material used for the housing 211.

[0090] The profiling support piece 230 is a sheet-like structure with a uniform thickness. Since the profiling support piece 230 surrounds the arc-shaped side surface 221, along the direction of surrounding the arc-shaped side surface 221, the profiling support piece 230 is also arc-shaped. The radius of curvature of the profiling support piece 230 is close to the radius of curvature of the arc-shaped side surface 221, so that the profiling support piece 230 and the arc-shaped side surface 221 can be attached to each other in a surface-contact manner. It should be noted that the radius of curvature of the profiling support piece 230 and the radius of curvature of the arc-shaped side surface 221 can be the same or slightly larger than the radius of curvature of the arc-shaped side surface 221, as long as the profiling support piece 230 and the arc-shaped side surface 221 can be attached to each other in a surface-contact manner.

[0091] In the above battery cell 200, a profiling support piece 230 is arranged between the arc-shaped side surface 221 of the core 220 and the first side wall 211a of the housing 211, and the profiling support piece 230 is connected to the housing 211. Therefore, the profiling support piece 230 can support the arc-shaped side surface 221 of the core 220. Since the profiling support piece 230 and the arc-shaped side surface 221 are attached to each other in a surface-contact manner, the profiling support piece 230 can provide uniform and stable support for the arc-shaped side surface 221 of the core 220, thereby effectively reducing the expansion deformation generated by the core 220 during charge and discharge and reducing the occurrence of structural problems.

[0092] Combined with Figures 3 to 5 It can be understood that the housing 211 includes two first side walls 211a opposite to each other along the first direction XX', and also includes two second side walls 211b opposite to each other along the second direction YY'. The two arc-shaped side surfaces 221 on the opposite sides of the core 220 along the first direction XX' are respectively opposite to the two first side walls 211a. The two flat side surfaces 222 on the opposite sides of the core 220 along the second direction YY' are respectively opposite to the two second side walls 211b.

[0093] Please combine Figures 3 to 5 , in an embodiment, profiling support pieces 230 are respectively arranged between the two arc-shaped side surfaces 221 on the opposite sides of the core 220 and the two first side walls 211a of the housing 211.

[0094] A profiling support piece 230 is provided between one of the first side walls 211a and the arc-shaped side surface 221 on one side of the core 220, and a profiling support piece 230 is provided between the other first side wall 211a and the arc-shaped side surface 221 on the other side of the core 220.

[0095] In this embodiment, by respectively providing profiling support pieces 230 between the two arc-shaped side surfaces 221 on the opposite sides of the core 220 and the two first side walls 211a of the housing 211, the profiling support pieces 230 located on both sides of the core 220 can respectively provide support for the core 220, and thus can more effectively reduce the expansion deformation generated by the core 220 during charge and discharge.

[0096] Please refer to Figures 3 to 5 , in one embodiment, the number of cores 220 is multiple. The arrangement direction of the multiple cores 220 is perpendicular to the first direction XX'. A profiling support piece 230 is provided between the arc-shaped side surface 221 on at least one side of each core 220 and the first side wall 211a.

[0097] In Figures 3 to 5 the illustrated embodiment, the number of cores 220 is two. It can be understood that the number of cores 220 can also be three, four or more. The arrangement direction of the multiple cores 220 is the second direction YY'.

[0098] In Figures 3 to 5 the illustrated embodiment, the arc-shaped side surface 221 on one side of each core 220 faces one of the first side walls 211a, and the arc-shaped side surface 221 on the other side faces the other first side wall 211a. A profiling support piece 230 is provided between the arc-shaped side surface 221 on one side of each core 220 and one of the first side walls 211a, and a profiling support piece 230 is provided between the arc-shaped side surface 221 on the other side of each core 220 and the other first side wall 211a.

[0099] In this embodiment, the number of cores 220 is multiple. By providing profiling support pieces 230 between the arc-shaped side surface 221 on at least one side of each core 220 and the first side wall 211a, the expansion deformation of each core 220 can be effectively reduced.

[0100] In other embodiments, the number of cores 220 in the battery cell 200 can also be one.

[0101] Please refer to Figures 3 to 5 , in one embodiment, the multiple profiling support pieces 230 located on the same side of the multiple cores 220 along the first direction XX' are connected to each other.

[0102] In Figures 3 to 5In the illustrated embodiment, the number of profiling support pieces 230 on the same side of the two bobbin cores 220 along the first direction XX' is two. The two profiling support pieces 230 located on the same side of the two bobbin cores 220 along the first direction XX' are connected to each other.

[0103] It can be understood that when the number of bobbin cores 220 is three or more, the number of profiling support pieces 230 on the same side of the multiple bobbin cores 220 is three or more.

[0104] In this embodiment, since the multiple profiling support pieces 230 on the same side of the multiple bobbin cores 220 are connected to each other, therefore, after the multiple profiling support pieces 230 on the same side of the multiple bobbin cores 220 are connected to each other, they can be loaded into the housing 211, which is convenient for connection. Moreover, the multiple profiling support pieces 230 on the same side of the multiple bobbin cores 220 are connected to each other, which can improve the support stability of the profiling support pieces 230.

[0105] Optionally, the connection manner between the multiple profiling support pieces 230 on the same side of the multiple bobbin cores 220 can be welding or bonding, or can be integrally formed.

[0106] Please refer to Figures 4 to 6 , in an embodiment, the battery cell 200 further includes a cover body 212, and an explosion-proof valve 240 is provided on the cover body 212. The cover body 212 covers an opening at one end of the housing 211 along the third direction ZZ', and is connected to the housing 211. The third direction ZZ' is the height direction of the battery cell 200.

[0107] The profiling support piece 230 is provided with an exhaust groove 231, and the exhaust groove 231 penetrates the profiling support piece 230 along the thickness direction of the profiling support piece 230. The first side wall 211a is a flat plate structure, so that an exhaust space 201 communicating with the exhaust groove 231 is formed between the first side wall 211a and the profiling support piece 230. Airflow can flow through the exhaust space 201 to the explosion-proof valve 240.

[0108] Specifically, one ends of the two first side walls 211a and the two second side walls 211b along the third direction ZZ' are both connected to the cover body 212, so that the cover body 212 covers the opening at one end of the housing 211.

[0109] During the charging and discharging process of the bobbin core 220, the temperature rises, so that the temperature and pressure of the gas in the housing 211 increase, and the gas flow is intensified.

[0110] In this embodiment, when the temperature and pressure inside the housing 211 increase, the gas can enter the exhaust space 201 through the exhaust groove 231 and flow along the third direction ZZ' in the exhaust space 201 towards the cover 212, so that the exhaust valve 240 provided on the cover 212 can be used for exhausting and relieving pressure. Thus, it can be seen that the technical solution of this embodiment provides an exhaust space for the gas inside the housing 211, facilitating the rapid exhaust and pressure relief of the battery cell 200.

[0111] Please refer to Figure 5 and Figure 6 , in one embodiment, one side of the profiling support piece 230 along the first direction XX' facing away from the arc-shaped side surface 221 is in tangential contact with the first side wall 211a.

[0112] Specifically in Figure 5 the illustrated embodiment, the profiling support piece 230 on one side of the core 220 is in tangential contact with the first side wall 211a, so that the profiling support piece 230 can be supported by the first side wall 211a. The profiling support piece 230 on the other side of the core 220 is in tangential contact with the first side wall 211a, so that the profiling support piece 230 can be supported by the first side wall 211a.

[0113] Since one side of the profiling support piece 230 along the first direction XX' facing away from the arc-shaped side surface 221 is in tangential contact with the first side wall 211a, the profiling support piece 230 can be supported by the first side wall 211a along the first direction XX', and further, the support strength for the core 220 along the first direction XX' can be improved, and further effectively reduce the expansion deformation generated by the core 220 during charge and discharge.

[0114] Please combine Figure 5 and Figure 6 , in one embodiment, the tangential contact position of the profiling support piece 230 and the first side wall 211a divides the exhaust space 201 into multiple (at least two) sub-spaces. Two adjacent sub-spaces are connected through the exhaust groove 231.

[0115] Specifically, it can be understood that when the number of cores 220 in the battery cell 200 is one, one profiling support piece 230 is provided on one side of the core 220 along the first direction XX'. At the tangential contact position of the profiling support piece 230 and the first side wall 211a, the profiling support piece 230 and the first side wall 211a are in contact with each other, resulting in the gas not being able to flow through this position, so that the exhaust space 201 is divided into two sub-spaces on both sides of this position. The exhaust grooves 231 provided on the profiling support piece 230 are respectively communicated with the two sub-spaces.

[0116] In Figure 5 and Figure 6In the illustrated embodiment, the number of the bobbin cores 220 is two, so that the exhaust space 201 can be divided into three sub-spaces. Among the three sub-spaces, the middle sub-space is jointly surrounded by two profiling support pieces 230 and the first side wall 211a. For the exhaust grooves 231 provided on each profiling support piece 230, each exhaust groove 231 can communicate the two adjacent sub-spaces on both sides of the tangential contact position corresponding to the profiling support piece 230 to which it corresponds.

[0117] It can be understood that the number of the bobbin cores 220 can also be three, four or more, and then the number of sub-spaces is correspondingly four, five or more.

[0118] In this embodiment, since the tangential contact position between the profiling support piece 230 and the first side wall 211a divides the exhaust space 201 into multiple successively adjacent sub-spaces, and two adjacent sub-spaces are connected through the exhaust groove 231, so that gas can flow between the two adjacent sub-spaces on both sides of the tangential contact position, enhancing the smoothness of gas flow, and further facilitating the rapid exhaust and pressure relief of the battery cell 200.

[0119] Please refer to Figure 5 and Figure 6 In an embodiment, the extending direction of the exhaust groove 231 is consistent with the surrounding direction of the profiling support piece 230 around the arc-shaped side surface 221.

[0120] Since the extending direction of the exhaust groove 231 is consistent with the surrounding direction of the profiling support piece 230 around the arc-shaped side surface 221, therefore, the exhaust groove 231 also surrounds the arc-shaped side surface 221. It can be understood that along the extending direction of the exhaust groove 231, the exhaust groove 231 passes through the above-mentioned tangential contact position, and both ends of the exhaust groove 231 extend to both sides of the tangential contact position, so that both ends of the exhaust groove 231 can communicate with the first space and the second space respectively. Optionally, the middle part of the exhaust groove 231 is located at the above-mentioned tangential contact position.

[0121] By making the extending direction of the exhaust groove 231 consistent with the surrounding direction of the profiling support piece 230 around the arc-shaped side surface 221, it is convenient to machine the exhaust groove 231.

[0122] In other embodiments, the extending direction of the exhaust groove 231 can also be other directions, as long as it can communicate the first space and the second space.

[0123] In other embodiments, the side of the profiling support piece 230 facing away from the arc-shaped side surface 221 along the first direction XX' and the side wall of the housing 211 can also be spaced apart from each other, that is, not in contact.

[0124] Please refer to Figure 5 and Figure 6, in one embodiment, a plurality of exhaust grooves 231 are provided on the profiling support sheet 230 at intervals along the third direction ZZ'.

[0125] In Figure 5 and Figure 6 In the illustrated embodiment, the number of the exhaust grooves 231 arranged on the profiling support sheet 230 along the third direction ZZ' is two. It can be understood that the number of the exhaust grooves 231 arranged on the profiling support sheet 230 along the third direction ZZ' can also be three, four or more. In other embodiments, the number of the exhaust grooves 231 on the profiling support sheet 230 can also be one.

[0126] In this embodiment, by providing a plurality of exhaust grooves 231 on the profiling support sheet 230 at intervals along the third direction ZZ', the fluidity of the gas in the housing 211 can be enhanced, facilitating the rapid exhaust and pressure relief of the battery cell 200.

[0127] In one embodiment, please refer to Figure 3 , the housing 211 further includes two second side walls 211b oppositely arranged in the second direction YY'. Each of the second side walls 211b is connected to two first side walls 211a on both sides along the first direction XX'.

[0128] The opposite sides of the winding core 220 along the second direction YY' are flat side surfaces 222 respectively. The second direction YY' is the opposite direction of the two second side walls 211b.

[0129] Please combine Figures 4 to 6 , the battery cell 200 further includes an extension piece 250. Along the surrounding direction of the profiling support sheet 230 around the arc-shaped side surface 221, the extension piece 250 has a first side edge 250a close to the profiling support sheet 230 and a second side edge 250b far from the profiling support sheet 230. The first side edge 250a is connected to one side of the profiling support sheet 230 along the surrounding direction, and the second side edge 250b is located between the second side wall 211b and the flat side surface 222.

[0130] Since the first side edge 250a of the extension piece 250 is connected to one side of the profiling support sheet 230 along the surrounding direction, and the second side edge 250b of the extension piece 250 is located between the second side wall 211b and the flat side surface 222, the presence of the extension piece 250 enables a gap to be maintained between the second side wall 211b and the flat side surface 222. Thus, it is convenient to load the winding core 220 into the housing 211.

[0131] Moreover, since the extension piece 250 extends from the first side edge 250a to the second side edge 250b of the self-extending piece 250, and the extension piece 250 extends from one side of the profiling support piece 230 to between the second side wall 211b and the flat side 222, that is, the second side edge 250b is located on one side of the core 220 along the second direction YY', the extension piece 250 and the profiling support piece 230 can jointly restrict the core 220 from the first direction XX' and the second direction YY', which is beneficial to maintaining good contact between the positive electrode sheet, the separator, and the negative electrode sheet of the core 220.

[0132] Moreover, the gap between the second side wall 211b and the flat side 222 can absorb the expansion of the core 220 in the second direction YY', thereby reducing the extrusion of the core 220 on the second side wall 211b.

[0133] Please refer to Figure 5 and Figure 6 , in an embodiment, extension pieces 250 are respectively provided between the two second side walls 211b and the core 220.

[0134] In this embodiment, the battery cell 200 includes a plurality of cores 220 arranged in sequence in the second direction YY'. Profiling support pieces 230 are respectively provided between the arc-shaped side surfaces 221 on the same side of the plurality of cores 220 and the first side wall 211a. Therefore, a plurality of profiling support pieces 230 are arranged in sequence in the second direction YY' between the same side of the plurality of cores 220 and the first side wall 211a.

[0135] Among the plurality of profiling support pieces 230 arranged in sequence in the second direction YY', an extension piece 250 is connected to one side of the profiling support piece 230 adjacent to one of the second side walls 211b, and this extension piece 250 is located between one of the flat side surfaces 222 of the plurality of cores 220 and the second side wall 211b. An extension piece 250 is connected to one side of the profiling support piece 230 adjacent to the other second side wall 211b, and this extension piece 250 is located between the other flat side surface 222 of the plurality of cores 220 and the second side wall 211b.

[0136] In this embodiment, since extension pieces 250 are respectively provided between the two second side walls 211b and the core 220, the two second side walls 211b can keep gaps with the core 220 respectively through the corresponding extension pieces 250, which is more convenient for the core 220 to be installed in the housing 211. Moreover, the extension pieces 250 between the two second side walls 211b and the core 220 can respectively restrict the two sides of the core 220, and can further make the positive electrode sheet, the separator, and the negative electrode sheet of the core 220 keep good contact.

[0137] In other embodiments, when the number of the core rolls is one, extension pieces are respectively connected to both sides of the profiling support piece along the above-mentioned surrounding direction, and the extension pieces on both sides of the profiling support piece are respectively located between the core roll and the two second side walls.

[0138] Please refer to Figure 5 and Figure 6 , in one embodiment, the second side 250b of the extension piece 250 is connected to the second side wall 211b.

[0139] Specifically, that is, the first side 250a of the extension piece 250 is connected to the profiling support piece 230, and the second side 250b is connected to the second side wall 211b. The extension piece 250 and the second side wall 211b can be connected by means such as welding and bonding.

[0140] By connecting the second side 250b of the extension piece 250 to the second side wall 211b, the connection stability of the extension piece 250 can be enhanced.

[0141] Please refer to Figure 5 and Figure 6 , in one embodiment, the surrounding range of the profiling support piece 230 for the arc-shaped side surface 221 is less than 180°. In the direction from the first side 250a to the second side 250b, the extension piece 250 is inclined towards the second side wall 211b.

[0142] Specifically, along the surrounding direction of the profiling support piece 230 for the arc-shaped side surface 221, the profiling support piece 230 extends in an arc shape, and its arc extension range (i.e., the above-mentioned surrounding range) is less than a semi-circular range. Therefore, the tangential direction on the side of the profiling support piece 230 close to the first side 250a is inclined towards the second side wall 211b.

[0143] In this way, in the direction from the first side 250a to the second side 250b, the extension piece 250 is inclined towards the second side wall 211b, so as to facilitate the smooth transition at the connection between the extension piece 250 and the profiling support piece 230, and reduce or avoid stress concentration.

[0144] Please refer to Figure 5 and Figure 6 , in one embodiment, the extension piece 250 includes an integrally formed first part 251 and a second part 252, and the connection between the first part 251 and the second part 252 is in smooth transition.

[0145] The first part 251 is located between the arc-shaped side surface 221 and the second side wall 211b, and the second part 252 is located between the flat side surface 222 and the second side wall 211b.

[0146] Specifically, the profiling support piece 230 surrounds the arc-shaped side surface 221 within a range less than 180°, and does not completely cover the arc-shaped side surface 221 along the surrounding direction. Therefore, a part of the extension piece 250 close to the profiling support piece 230 (i.e., the first part 251) faces the area of the arc-shaped side surface 221 not covered by the profiling support piece 230, and the other part (i.e., the second part 252) faces the straight side surface 222.

[0147] By means of a smooth transition at the connection between the first part 251 and the second part 252, stress concentration can be reduced or avoided.

[0148] In one embodiment, the extension piece 250 extends in an arc from the first side 250a to the second side 250b.

[0149] Since the profiling support piece 230 is arc-shaped and the extension piece 250 is also arc-shaped, the extension of the extension piece 250 from the first side 250a to the second side 250b can be gradually and smoothly transitioned.

[0150] In other embodiments, the extension piece 250 may also be in a flat sheet-like structure.

[0151] In one embodiment, the connection manner between the extension piece 250 and the second side wall 211b is welding or bonding. The connection manner between the extension piece 250 and the profiling support piece 230 is welding or bonding.

[0152] In other embodiments, the profiling support piece, the extension piece, and the housing may also be of an integrally formed structure. For example, an integrally formed plate can be used to bend to obtain the connection structure of the profiling support piece, the extension piece, and the second side wall. Specifically, a whole plate can be used, starting from the connection point between the second side wall and the extension piece 250, and bending along the circumferential direction of the housing 211 in sequence to obtain the side wall structure of the housing 211 (i.e., the first side wall 211a, the second side wall 211b, the first side wall 211a, the second side wall 211b), and the bending point returns to the starting point, and then continues to bend along the circumferential direction inside the housing 211 in sequence to form the extension piece, the profiling support piece, the extension piece, etc. in sequence, so that the extension pieces and profiling support pieces located inside the housing can be obtained.

[0153] One embodiment of the present application further provides a battery device 10, including a battery box 100 and any one of the battery monomers 200 in the above embodiments, and the battery monomer 200 is located inside the battery box 100.

[0154] For the above-mentioned battery device 10, a profiling support piece 230 is disposed between the arc-shaped side surface 221 of the core 220 and the first side wall 211a of the housing 211, and the profiling support piece 230 is connected to the housing 211. Therefore, the profiling support piece 230 can support the arc-shaped side surface 221 of the core 220. Since the profiling support piece 230 and the arc-shaped side surface 221 are attached to each other in a surface-contact manner, the profiling support piece 230 can provide uniform and stable support for the arc-shaped side surface 221 of the core 220, thereby effectively reducing the expansion deformation generated by the core 220 during charging and discharging and reducing the occurrence of structural problems.

[0155] An embodiment of the present application further provides an electrical device, including the above-mentioned battery device 10, and the battery device 10 is used to provide electrical energy for the electrical device.

[0156] For the above-mentioned electrical device, a profiling support piece 230 is disposed between the arc-shaped side surface 221 of the core 220 and the first side wall 211a of the housing 211, and the profiling support piece 230 is connected to the housing 211. Therefore, the profiling support piece 230 can support the arc-shaped side surface 221 of the core 220. Since the profiling support piece 230 and the arc-shaped side surface 221 are attached to each other in a surface-contact manner, the profiling support piece 230 can provide uniform and stable support for the arc-shaped side surface 221 of the core 220, thereby effectively reducing the expansion deformation generated by the core 220 during charging and discharging and reducing the occurrence of structural problems.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended 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 make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various 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 falling within the scope of the claims.

Claims

1. A battery cell (200), characterized in that: The battery cell (200) comprises: A shell (211), the shell (211) comprising two first side walls (211a) arranged opposite to each other along a first direction (XX') and two second side walls (211b) arranged opposite to each other along a second direction (YY'), each of the second side walls (211b) being connected to the two first side walls (211a) at two sides along the first direction (XX'); A winding core (220), the winding core (220) being located in the shell (211), the two sides of the winding core (220) along the first direction (XX') being respectively outwardly convex arc-shaped side surfaces (221), and the two sides of the winding core (220) along the second direction (YY') being respectively flat side surfaces (222); a contoured support sheet (230), the contoured support sheet (230) being connected to the shell (211), the contoured support sheet (230) being provided between the arc-shaped side surface (221) of at least one side of the winding core (220) and the first side wall (211a), the contoured support sheet (230) surrounding the arc-shaped side surface (221), and the contoured support sheet (230) and the arc-shaped side surface (221) being attached to each other in a surface contact manner; and An extension piece (250) is provided along a direction in which the contoured support piece (230) surrounds the arcuate side surface (221), wherein the extension piece (250) has a first side edge (250a) close to the contoured support piece (230) and a second side edge (250b) away from the contoured support piece (230), wherein the first side edge (250a) is connected to one side of the contoured support piece (230) along the surrounding direction, and the second side edge (250b) is located between the second side wall (211b) and the straight side surface (222).

2. The battery cell (200) according to claim 1, characterized in that: The battery cell (200) further comprises a cover body (212), an explosion-proof valve (240) being provided on the cover body (212), the cover body (212) covering an opening at one end of the shell (211) along a third direction (ZZ') and connected to the shell (211), the third direction (ZZ') being the height direction of the battery cell (200); The contoured support sheet (230) is provided with an exhaust groove (231); the first side wall (211a) is a flat plate structure, and an exhaust space (201) connected to the exhaust groove (231) is formed between the first side wall (211a) and the contoured support sheet (230), so that air can flow to the explosion-proof valve (240) through the exhaust space (201).

3. The battery cell (200) according to claim 2, characterized in that: The side of the contoured support sheet (230) facing away from the arc-shaped side surface (221) along the first direction (XX') is in tangential contact with the first side wall (211a).

4. The battery cell (200) according to claim 3, characterized in that: The tangential contact position between the contoured support sheet (230) and the first side wall (211a) divides the exhaust space (201) into a plurality of sequentially adjacent subspaces; Two adjacent sub-spaces are connected via the exhaust groove (231).

5. The battery cell (200) according to claim 4, characterized in that: The extension direction of the exhaust groove (231) is consistent with the direction in which the contoured support sheet (230) surrounds the arc-shaped side surface (221).

6. The battery cell (200) according to claim 2, characterized in that: The contoured support sheet (230) is provided with a plurality of exhaust grooves (231) arranged at intervals along the third direction (ZZ').

7. The battery cell (200) according to claim 1, characterized in that: The extension pieces (250) are respectively arranged between the two second side walls (211b) and the winding core (220).

8. The battery cell (200) according to claim 1, characterized in that: The second side edge (250b) is connected to the second side wall (211b).

9. The battery cell (200) according to claim 8, characterized in that: The second side edge (250b) and the second side wall (211b) are welded or bonded.

10. The battery cell (200) according to claim 1, characterized in that: The surrounding angle of the contoured support sheet (230) to the arc-shaped side surface (221) is less than 180°; From the direction from the first side edge (250a) to the second side edge (250b), the extension piece (250) is inclined in a direction close to the second side wall (211b), so that the connection between the extension piece (250) and the contoured support piece (230) is smoothly transitioned.

11. The battery cell (200) according to claim 10, characterized in that: The extension piece (250) extends in an arc shape from the first side edge (250a) to the second side edge (250b); or, The extension sheet (250) is in a planar sheet structure.

12. The battery cell (200) according to claim 1, characterized in that: The extension piece (250) comprises a first part (251) and a second part (252) which are integrally formed, and a connection between the first part (251) and the second part (252) forms a smooth transition; The first portion (251) is located between the curved side surface (221) and the second side wall (211b), and the second portion (252) is located between the straight side surface (222) and the second side wall (211b).

13. The battery cell (200) according to claim 1, characterized in that: The contoured support sheets (230) are respectively provided between the two arc-shaped side surfaces (221) and the two first side walls (211a) on both sides of the winding core (220) along the first direction (XX').

14. The battery cell (200) according to claim 1, characterized in that: The number of the winding cores (220) is multiple; the arrangement direction of the multiple winding cores (220) is perpendicular to the first direction (XX'); The contoured support sheet (230) is provided between the arc-shaped side surface (221) and the first side wall (211a) on at least one side of each winding core (220) along the first direction (XX').

15. The battery cell (200) according to claim 14, characterized in that: The plurality of contoured support sheets (230) located on the same side of the plurality of winding cores (220) along the first direction (XX') are connected to each other.

16. A battery device (10), characterized in that: It comprises a battery box (100) and a battery cell (200) according to any one of claims 1 to 15, wherein the battery cell (200) is located in the battery box (100).

17. An electrical device, characterized in that: It comprises the battery device (10) as claimed in claim 16, wherein the battery device (10) is used to provide electrical energy to the electrical device.

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