Battery cell, battery, and electric device

Abstract

The present application discloses a battery cell, a battery, and an electric device. The battery cell comprises: a casing, the casing comprising a first surface, a second surface, a third surface, and a flange, wherein the flange surrounds the first surface and is connected to the first surface, the first surface is opposite to the third surface, and the second surface is connected between the flange and the third surface; and an insulating film covering the casing and covering at least part of the first surface, at least part of the flange, at least part of the third surface, and at least part of the second surface, wherein the insulating film is folded from the flange to the second surface to form a first folded area, the insulating film is folded from the third surface to the second surface to form a second folded area, and in the direction from the first surface to the third surface, the size of the first folded area is smaller than that of the second folded area. The insulating film can still fully cover the casing even if the casing is provided with the flange.

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to Chinese Patent Application No. 2023224908677, filed on September 13, 2023, entitled “Battery Cell, Battery and Electric Device,” filed with the Chinese Patent Office, the entire contents of which are incorporated herein by reference.

Technical field

[0002] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. [Background Technology]

[0003] Rechargeable batteries are widely used in electric vehicles, mobile devices, and power tools due to their high energy density, high power density, high cycle life, and long storage life. Existing battery cells typically consist of a housing and a non-conductive insulating film. The insulating film wraps around the outer surface of the housing, isolating it from the outside environment and providing protection. However, when the housing has a protruding flange, the insulating film is difficult to wrap around the housing, resulting in poor insulation of the battery cell.

[0004] [Summary of the invention]

[0005] The present disclosure provides a battery cell, which includes a shell, the shell including a first surface, a second surface, a third surface and a flange, the flange is arranged around the first surface and connected to the first surface, the first surface and the third surface are opposite to each other, and the second surface is connected between the flange and the third surface; and an insulating film wrapped around the outside of the shell, the insulating film wrapping at least a portion of the first surface, at least a portion of the flange, at least a portion of the third surface and at least a portion of the second surface; wherein the insulating film is folded from the flange to the second surface to form a first folding area, and the insulating film is folded from the third surface to the second surface to form a second folding area, and the size of the first folding area is smaller than the size of the second folding area along the direction from the first surface to the third surface.

[0006] Through the above method, the first surface, flange, third surface, and second surface are all wrapped with an insulating film. Even when the housing is provided with a flange, the insulating film can be fully wrapped around the housing, effectively protecting the housing with the insulating film, thereby improving the stability of the battery cell. Furthermore, when wrapping a battery cell with a flange with the insulating film, the insulating film used to wrap rectangular battery cells without flanges can be directly used, eliminating the need to customize the shape of the insulating film, thereby saving costs.

[0007] In some embodiments, the insulating film is a unitary structure.

[0008] Through the above method, the insulating film with an integrated structure is more conducive to being wrapped into the shell through convenient conventional processes such as bending. Compared with the insulating film with a splicing structure, the insulating film does not require additional splicing and forming, and the production of battery cells is more convenient.

[0009] In some embodiments, a portion of the second surface is exposed between the first folding area and the second folding area for use as the first connecting colloid or the first insulating sheet.

[0010] Through the above method, when the second surface position needs to be attached with the first insulating sheet or filled with the first colloid, the first insulating sheet or the first colloid can be directly fixed to the exposed portion of the second surface between the first folding area and the second folding area. The colloid or insulating sheet can be more conveniently connected to the battery cell, and the battery cell assembly is convenient.

[0011] In some embodiments, the first folding area and the second folding area are overlapped.

[0012] Through the above method, the overlapping first folding area and the second folding area provide good protection for the second surface, the insulating film can better cover the second surface, and the insulation effect of the battery cell is better.

[0013] In some embodiments, the fourth surface of the shell is arranged opposite to the second surface, the insulating film is folded from the flange to the fourth surface and forms a third folded area, the insulating film is folded from the third surface to the fourth surface and forms a fourth folded area, and the size of the third folded area is smaller than the size of the fourth folded area along the direction pointing from the first surface to the third surface.

[0014] Through the above method, at least a portion of the fourth surface can be wrapped by the insulating film, and the insulating film can more completely wrap the shell, thereby isolating the shell from the external environment and enhancing the stability of the battery cell.

[0015] In some embodiments, a portion of the fourth surface is exposed between the third folding area and the fourth folding area for connecting the second colloid or the second insulating sheet.

[0016] Through the above method, when the fourth surface position needs to be attached with a second insulating sheet or filled with a second colloid, the second insulating sheet or the second colloid can be directly fixed to the fourth surface exposed between the third folding area and the fourth folding area. The colloid or insulating sheet can be more conveniently connected to the battery cell, and the battery cell assembly is convenient.

[0017] In some embodiments, the third folding area and the fourth folding area are overlapped.

[0018] Through the above method, the overlapping third folding area and the fourth folding area provide good protection for the fourth surface, the insulating film can better cover the fourth surface, and the insulation effect of the battery cell is better.

[0019] In some embodiments, the fifth surface of the shell is disposed adjacent to the first surface and the third surface, and the fifth surface of the shell is also disposed adjacent to the second surface and the fourth surface, and the insulating film completely covers the fifth surface.

[0020] Through the above method, the fifth surface can also be wrapped by the insulating film, and the insulating film can further wrap the shell to isolate the shell from the external environment, thereby improving the stability of the battery cell.

[0021] In some embodiments, the sixth surface of the shell is arranged opposite to the fifth surface, the sixth surface of the shell is located between the second surface and the fourth surface, and the sixth surface of the shell is also located between the first surface and the third surface, and the insulating film covers at least a portion of the sixth surface.

[0022] Through the above method, at least a portion of the sixth surface can be wrapped by the insulating film, and the insulating film can more comprehensively wrap the shell, so that the shell is isolated from the external environment, and the stability of the battery cell is enhanced.

[0023] In some embodiments, the insulating film is folded from the flange to the sixth surface and forms a fifth folding region, and the insulating film is folded from the third surface to the sixth surface and forms a sixth folding region. Along the direction from the first surface to the third surface, the size of the fifth folding region is smaller than the size of the sixth folding region.

[0024] Through the above method, before the insulating film is folded from the flange and the third surface to the sixth surface, the size of one end of the insulating film forming the fifth folding area is closer to that of one end of the insulating film forming the sixth folding area, and the process of wrapping the battery cell with the insulating film can be simpler.

[0025] In some embodiments, the battery cell further includes an electrode connector, and the electrode connector protrudes from the fourth surface or the sixth surface.

[0026] Through the above method, the electrode connector protrudes from the fourth surface or the sixth surface, which can achieve connection with an external circuit, and the battery cell is easy to use.

[0027] In some embodiments, the shell includes a top cover and an integrally formed shell body and a flange, the shell body includes a bottom wall and a side wall, one end of the side wall is connected to the bottom wall, and the other end is connected to the flange, and the top cover is connected to the flange to form an accommodating space; the side wall includes a first side wall, a second side wall, a third side wall and a fourth side wall connected end to end in sequence, the first side wall and the third side wall are arranged opposite to each other, and the second side wall and the fourth side wall are arranged opposite to each other; a side of the top cover facing away from the shell body forms a first surface, a side of the bottom wall facing away from the top cover forms a third surface, a side of the first side wall facing away from the accommodating space forms a second surface, a side of the third side wall facing away from the accommodating space forms a fourth surface, a side of the second side wall facing away from the accommodating space forms a sixth surface, and a side of the fourth side wall facing away from the accommodating space forms a fifth surface.

[0028] Through the above method, the top cover can be well connected to the shell body through the flange, and the electrode connector extends from the fourth surface or the sixth surface to achieve connection with the external circuit, making the battery cell easy to use.

[0029] In some embodiments, the battery cell further includes a top patch having a through hole formed thereon, an electrode connector is disposed on the sixth surface, a portion of the electrode connector is located in the through hole, a portion of the sixth surface is exposed between the fifth fold area and the sixth fold area for connecting the top patch, and an edge of the top patch is connected to the insulating film.

[0030] Through this method, the top patch further isolates the sixth surface from the external environment, preventing scratches on the sixth surface and reducing the risk of short circuits in the battery cells. Furthermore, the top patch is well secured to the exposed portion of the sixth surface between the fifth and sixth folds, improving the stability of the battery cells.

[0031] In some embodiments, the insulating film at the sixth surface is overlapped and covers a portion of the sixth surface except for the electrode connector.

[0032] Through the above method, the sixth surface of the shell is enclosed in the insulating film and is completely isolated from the external environment, so the insulation effect of the battery cell is better.

[0033] In some embodiments, an angle is formed between the surface adjacent to the first surface and the flange, and a gap is formed between the insulating film and the housing at the angle.

[0034] Through the above method, the insulating film does not have to be completely in contact with the angle at the angle, the insulating film is easier to wrap, and the production of battery cells is more convenient.

[0035] In some embodiments, at the angle, the housing and the insulating film cooperate to form a closed space.

[0036] Through the above method, the shell at the corner is isolated from the external environment in a closed space, and the insulating film can also provide good protection for the shell without being attached to the corner. The battery cell is easy to produce and has good stability.

[0037] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0038] In a third aspect, the present application provides an electrical device, which includes the battery of the above embodiment, and the battery is used to power the electrical device.

[0039] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

Brief Description of the Drawings

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0041] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0042] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0043] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0044] FIG4 is a schematic structural diagram of a battery cell according to one or more embodiments;

[0045] FIG5 is a schematic structural diagram of an insulating film according to one or more embodiments;

[0046] FIG6 is a schematic structural diagram of a second surface of a battery cell according to one or more embodiments;

[0047] FIG7 is an enlarged schematic diagram of A in FIG6 ;

[0048] FIG8 is another schematic structural diagram of the second surface of a battery cell according to one or more embodiments;

[0049] FIG9 is a schematic structural diagram of a fourth surface of a battery cell according to one or more embodiments;

[0050] FIG10 is an enlarged schematic diagram of B in FIG9 ;

[0051] FIG11 is another schematic structural diagram of the fourth surface of a battery cell according to one or more embodiments;

[0052] FIG12 is a schematic structural diagram of a fifth surface of a battery cell according to one or more embodiments;

[0053] 13 is a schematic structural diagram of a sixth surface of a battery cell according to one or more embodiments;

[0054] FIG14 is an enlarged schematic diagram of D in FIG13;

[0055] FIG15 is a schematic cross-sectional view of EE in FIG6 ;

[0056] FIG16 is an enlarged schematic diagram of F in FIG15 .

[0057] The reference numerals in the specific embodiments are as follows: 1000, vehicle; 200, controller; 300, motor; 100, battery; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, electrode assembly; 22, housing; 221, first surface; 222, second surface; 2221, first folding area; 2222, second folding area; 223, third surface; 224, fourth surface; 2241, third folding area; 2242, fourth folding area; 225, fifth surface; 226, sixth surface; 2261, fifth folding area; 2262, sixth folding area; 227, housing itself Body; 2271, bottom wall; 2272, side wall; 2272a, first side wall; 2272b, second side wall; 2272c, third side wall; 2272d, fourth side wall; 2273, opening; 228, top cover; 229, flange; 23, electrode connector; 24, insulating film; 241, first insulating sheet; 242, second insulating sheet; 25, top patch; 251, through hole; 26, enclosed space; 27, accommodating space. [Specific implementation method]

[0058] The following embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and are not intended to limit the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0060] In the description of the embodiments of the present application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise clearly and specifically defined, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two (including two), and "multiple pieces" refers to more than two (including two).

[0061] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply 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 on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0065] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0066] A battery cell typically consists of a housing and an insulating film, made of a non-conductive, insulating material. The insulating film is typically wrapped around the outer surface of the housing, isolating it from the outside environment and providing insulation protection. However, this approach presents some issues. For example, when the housing has a protruding flange, the outer surface of the housing is uneven at the flange, making it more difficult to completely wrap the insulating film around the housing. Furthermore, when the housing is not fully wrapped, insulation failure of the battery cell is likely to occur, affecting the stability of the battery cell.

[0067] Based on the above considerations, in order to solve the technical problems existing in the battery cell in the prior art, the present application proposes a battery cell, in which when the shell of the battery cell is provided with a flange, the insulating film can also be well wrapped in the shell.

[0068] The present application provides an electric device, which may include but is not limited to mobile phones, computers, cars, tablets, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0070] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle according to one or more embodiments.

[0071] The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000.

[0072] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] In order to improve the performance of electrical devices, the present application also provides a battery 100. Please refer to Figure 2, which is a schematic diagram of the decomposed structure of a battery according to one or more embodiments. The shape of the battery 100 includes but is not limited to a square. In other embodiments, the shape of the battery 100 can also be cylindrical, square, or any other shape. The battery 100 can be an energy storage device, etc. The energy storage device is a type of battery 100, which can be used as a power grid, or in scenarios such as home life or business, for storing and / or releasing electrical energy.

[0074] In some embodiments, the battery 100 may include a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and may have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 may also each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0075] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0076] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0077] Battery 100 can be manufactured in two ways: laminated and wound. Laminated batteries offer uniform current collection, low internal resistance, and high specific power, but they require extremely high mold precision, high equipment investment, and a relatively complex process, resulting in low production efficiency. Wound batteries are simple to manufacture, with moderate equipment precision requirements during the production and assembly processes. They offer high production efficiency and low cost. In terms of performance, wound batteries offer excellent high and low temperature performance, rapid charging, an extremely long lifespan, stable high output voltage, a sturdy structure, and strong shock resistance.

[0078] Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments; Figure 4 is a schematic diagram of the structure of a battery cell according to one or more embodiments. A battery cell 20 is the smallest unit that makes up the battery 100. The battery cell 20 includes a top cover 228, a housing 22, an electrode assembly 21, and other functional components.

[0079] The top cover 228 refers to a component that covers the opening 2273 of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the top cover 228 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the top cover 228 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 228 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. The material of the top cover 228 can also be a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can also be provided on the inner side of the top cover 228. The insulating member can be used to isolate the electrical connection components in the shell 22 from the top cover 228 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0080] The housing 22 is a component that cooperates with the top cover 228 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 21, electrolyte, and other components. The housing 22 and top cover 228 can be separate components. An opening 2273 can be provided in the housing 22. The top cover 228 is then positioned over the opening 2273 to form the internal environment of the battery cell 20. Alternatively, the top cover 228 and housing 22 can be integrated. Specifically, the top cover 228 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 is to be enclosed, the top cover 228 is then positioned over the housing 22. The housing 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 21. The housing 22 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0081] The electrode assembly 21 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 21 may be contained in the shell 22. The electrode assembly 21 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 21, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery cell 20, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode connector 23 to form a current loop.

[0082] Referring to Figures 5 to 7 , Figure 5 is a schematic diagram of the structure of an insulating film according to one or more embodiments; Figure 6 is a schematic diagram of the structure of the second surface of a battery cell according to one or more embodiments; and Figure 7 is an enlarged schematic diagram of A in Figure 6 . In conjunction with Figures 1 to 5 , according to some embodiments of the present application, a battery cell 20 is provided. The battery cell 20 includes a housing 22, which includes a first surface 221, a second surface 222, and a third surface 223, and a flange 229. The flange 229 is arranged around the first surface 221 and connected to the first surface 221. The first surface 221 and the third surface 223 are opposite to each other, and the second surface 222 is connected between the flange 229 and the third surface 223; and an insulating film 24 wrapped around the outside of the housing 22, and the insulating film 24 wraps at least a portion of the first surface 221, at least a portion of the flange 229, at least a portion of the third surface 223, and at least a portion of the second surface 222. The insulating film 24 is folded from the flange 229 to the second surface 222 to form a first folding region 2221, and the insulating film 24 is folded from the third surface 223 to the second surface 222 to form a second folding region 2222. In the direction from the first surface 221 to the third surface 223, the dimension L1 of the first folding region 2221 is smaller than the dimension L2 of the second folding region 2222.

[0083] Specifically, the insulating film 24 may have insulating properties. The flange 229 may be located in the same plane as the first surface 221. The flange 229 may be arranged to extend around the edge of the first surface 221. The flange 229 may be used to connect to the top cover 228. The insulating film 24 may be completely attached to the second surface 222, or may be partially attached to the second surface 222. The insulating film 24 may completely wrap the first surface 221, or may partially wrap the first surface 221. The insulating film 24 may completely wrap the second surface 222, or may partially wrap the second surface 222. The insulating film 24 may completely wrap the third surface 223, or may partially wrap the third surface 223. The insulating film 24 may completely wrap the flange 229, or may partially wrap the flange 229.

[0084] Folding the insulating film 24 from the flange 229 to the second surface 222 means that the insulating film 24 is bent between the side of the flange 229 facing the first surface 221 and the side of the insulating film 24 facing away from the first surface 221, and extends to the second surface 222. The first folding region 2221 is the portion of the insulating film 24 that extends from the flange 229 to the second surface 222. Folding the insulating film 24 from the third surface 223 to the second surface 222 means that the insulating film 24 is bent at the intersection of the second surface 222 and the third surface 223, and extends to the second surface 222. The second folding region 2222 is the portion of the insulating film 24 that extends from the third surface 223 to the second surface 222. The dimension L1 of the first folding region 2221 refers to the length of the first folding region 2221 along the direction from the first surface 221 to the third surface 223. The dimension L2 of the second folding region 2222 refers to the length of the second folding region 2222 along the direction from the first surface 221 to the third surface 223.

[0085] Through the above method, the first surface 221, flange 229, third surface 223, and second surface 222 are all wrapped with the insulating film 24. Even when the housing 22 is provided with a flange 229, the insulating film 24 can fully wrap around the housing 22. The housing 22 is well protected by the insulating film 24, and the stability of the battery cell 20 is improved. Furthermore, when wrapping the insulating film 24 around a battery cell 20 with a flange 229, the insulating film 24 used to wrap rectangular battery cells 20 without flanges 229 can be directly used, eliminating the need to customize the shape of the insulating film 24, thereby saving costs.

[0086] According to some embodiments of the present application, the insulating film 24 is an integral structure.

[0087] Through the above method, the one-piece insulating film 24 is more conducive to being wrapped into the shell 22 through convenient conventional processes such as bending. Compared with the insulating film 24 with a splicing structure, the insulating film 24 does not require additional splicing steps to form, and the production of the battery cell 20 is more convenient.

[0088] Please continue to refer to Figures 1 to 7. According to some embodiments of the present application, a portion of the second surface 222 is exposed between the first folded area 2221 and the second folded area 2222 for connecting to a first colloid (not shown) or a first insulating sheet 241.

[0089] The portion of the second surface 222 exposed between the first folding area 2221 and the second folding area 2222 can be located near the center of the second surface 222 or near the edge of the second surface 222. The housing 22 can communicate with the external environment through the portion of the second surface 222 exposed between the first folding area 2221 and the second folding area 2222.

[0090] In one embodiment, the insulating film 24 wraps around the second surface 222. The portion of the insulating film 24 wrapped around the second surface 222 penetrates through, exposing a portion of the second surface 222 exposed between the first fold region 2221 and the second fold region 2222. In another embodiment, the insulating film 24 partially wraps around the second surface 222. The portion of the second surface 222 exposed between the first fold region 2221 and the second fold region 2222 is formed by the edges of the first fold region 2221 and the second fold region 2222.

[0091] The exposed portion of the second surface 222 between the first folding area 2221 and the second folding area 2222 can be attached with a first insulating sheet 241 or filled with a first colloid. The first insulating sheet 241 can be a sheet-like structure with insulating properties. The first insulating sheet 241 can be placed over and secured to the exposed portion of the second surface 222 between the first folding area 2221 and the second folding area 2222. The first colloid can be filled into the exposed portion of the second surface 222 between the first folding area 2221 and the second folding area 2222 and bonded to the housing 22.

[0092] The first insulating sheet 241 or the first colloid may be a part of the battery cell 20 , or may be a part of the battery 100 that is not included in the battery cell 20 .

[0093] Through the above method, when the second surface 222 needs to be attached with the first insulating sheet 241 or filled with the first colloid, the first insulating sheet 241 or the first colloid can be directly fixed to the portion of the second surface 222 exposed between the first folding area 2221 and the second folding area 2222. The colloid or insulating sheet can be more conveniently connected to the battery cell 20, and the battery cell 20 is easy to assemble.

[0094] Please refer to Figure 8, which is another schematic diagram of the structure of the second surface of the battery cell according to one or more embodiments. In conjunction with Figures 1 to 7, according to some embodiments of the present application, the first folding area 2221 and the second folding area 2222 are arranged to overlap.

[0095] The overlapping arrangement of the first folding area 2221 and the second folding area 2222 means that the first folding area 2221 at least partially covers the second folding area 2222, or the second folding area 2222 at least partially covers the first folding area 2221. The first folding area 2221 and the second folding area 2222 may completely cover the second surface 222, or may partially cover the second surface 222.

[0096] Through the above method, the overlapping first folding area 2221 and the second folding area 2222 provide good protection for the second surface 222 , the insulating film 24 can better cover the second surface 222 , and the insulation effect of the battery cell 20 is better.

[0097] Please refer to Figures 9 to 11. Figure 9 is a schematic structural diagram of the fourth surface of a battery cell according to one or more embodiments; Figure 10 is an enlarged schematic diagram of B in Figure 9; and Figure 11 is another schematic structural diagram of the fourth surface of a battery cell according to one or more embodiments. In conjunction with Figures 1 to 8, according to some embodiments of the present application, the fourth surface 224 of the housing 22 is disposed opposite the second surface 222. One side edge of the insulating film 24 is also located on the fourth surface 224. The insulating film 24 is folded from the flange 229 to the fourth surface 224 to form a third folding area 2241. The insulating film 24 is folded from the third surface 223 to the fourth surface 224 to form a fourth folding area 2242. Along the direction from the first surface 221 to the third surface 223, the dimension L3 of the third folding area 2241 is smaller than the dimension L4 of the fourth folding area 2242.

[0098] Specifically, the fourth surface 224 can be disposed adjacent to the first surface 221 and the third surface 223. Folding the insulating film 24 from the flange 229 to the fourth surface 224 means that the insulating film 24 is bent between the side of the flange 229 facing the first surface 221 and the side of the insulating film 24 facing away from the first surface 221, and extends to the fourth surface 224. The third folding region 2241 is the portion of the insulating film 24 extending from the flange 229 to the fourth surface 224. Folding the insulating film 24 from the third surface 223 to the fourth surface 224 means that the insulating film 24 is bent at the intersection of the fourth surface 224 and the third surface 223, and extends to the fourth surface 224. The fourth folding region 2242 is the portion of the insulating film 24 extending from the third surface 223 to the fourth surface 224. The insulating film 24 can be completely or partially attached to the fourth surface 224.

[0099] The dimension L3 of the third folding area 2241 is the length of the third folding area 2241 along the direction from the first surface 221 to the third surface 223. The dimension L4 of the fourth folding area 2242 is the length of the fourth folding area 2242 along the direction from the first surface 221 to the third surface 223.

[0100] Through the above method, at least a portion of the fourth surface 224 can be wrapped by the insulating film 24. The insulating film 24 can more completely wrap the shell 22, isolating the shell 22 from the external environment, and enhancing the stability of the battery cell 20.

[0101] According to some embodiments of the present application, a portion of the fourth surface 224 is exposed between the third folding area 2241 and the fourth folding area 2242 for connecting to a second colloid (not shown) or a second insulating sheet 242 .

[0102] The portion of the fourth surface 224 exposed between the third folding area 2241 and the fourth folding area 2242 can be disposed near the center point of the fourth surface 224 or near the edge of the fourth surface 224. The housing 22 can communicate with the external environment through the portion of the fourth surface 224 exposed between the third folding area 2241 and the fourth folding area 2242.

[0103] In one embodiment, the insulating film 24 wraps around the fourth surface 224. The portion of the insulating film 24 wrapped around the fourth surface 224 penetrates through, exposing a portion of the fourth surface 224 exposed between the third fold region 2241 and the fourth fold region 2242. In another embodiment, the insulating film 24 partially wraps around the fourth surface 224. The portion of the fourth surface 224 exposed between the third fold region 2241 and the fourth fold region 2242 is formed by the edges of the third fold region 2241 and the fourth fold region 2242.

[0104] The exposed portion of the fourth surface 224 between the third folding area 2241 and the fourth folding area 2242 can be attached with a second insulating sheet 242 or filled with a second colloid. The second insulating sheet 242 can be a sheet-like structure with insulating properties. The second insulating sheet 242 can be placed over and secured to the exposed portion of the fourth surface 224 between the third folding area 2241 and the fourth folding area 2242. The second colloid can be filled into the exposed portion of the fourth surface 224 between the third folding area 2241 and the fourth folding area 2242 and bonded to the housing 22.

[0105] The second insulating sheet 242 or the second colloid may be a part of the battery cell 20 , or may be a part of the battery 100 that is not included in the battery cell 20 .

[0106] Through the above method, when the second insulating sheet 242 needs to be attached to the position of the fourth surface 224 or filled with the second colloid, the second insulating sheet 242 or the second colloid can be directly fixed to the portion of the fourth surface 224 exposed between the third folding area 2241 and the fourth folding area 2242. The colloid or insulating sheet can be more conveniently connected to the battery cell 20, and the battery cell 20 is easy to assemble.

[0107] According to some embodiments of the present application, the third folding area 2241 and the fourth folding area 2242 are arranged to overlap.

[0108] The overlapping arrangement of the third folding area 2241 and the fourth folding area 2242 means that the third folding area 2241 at least partially covers the fourth folding area 2242, or the fourth folding area 2242 at least partially covers the third folding area 2241. The third folding area 2241 and the fourth folding area 2242 can completely cover the fourth surface 224, or can also partially cover the fourth surface 224.

[0109] Through the above method, the overlapping third folding area 2241 and the fourth folding area 2242 provide good protection for the fourth surface 224 , the insulating film 24 can better cover the fourth surface 224 , and the insulation effect of the battery cell 20 is better.

[0110] Please refer to Figure 12, which is a schematic diagram of the structure of the fifth surface of a battery cell according to one or more embodiments. In conjunction with Figures 1 to 11, according to some embodiments of the present application, the fifth surface 225 of the housing 22 is disposed adjacent to the first surface 221 and the third surface 223. The fifth surface 225 of the housing 22 is also disposed adjacent to the second surface 222 and the fourth surface 224, and the insulating film 24 completely covers the fifth surface 225.

[0111] Through the above method, the fifth surface 225 can also be wrapped by the insulating film 24 , and the insulating film 24 can further wrap the shell 22 to isolate the shell 22 from the external environment, thereby improving the stability of the battery cell 20 .

[0112] According to some embodiments of the present application, the sixth surface 226 of the housing 22 is disposed opposite the fifth surface 225. The sixth surface 226 of the housing 22 is located between the second surface 222 and the fourth surface 224. The sixth surface 226 of the housing 22 is also located between the first surface 221 and the third surface 223. The insulating film 24 covers at least a portion of the sixth surface 226. The insulating film 24 may partially cover the sixth surface 226 or may completely cover the sixth surface 226.

[0113] Through the above method, at least a portion of the sixth surface 226 can be wrapped by the insulating film 24 , and the insulating film 24 can more completely wrap the shell 22 , isolating the shell 22 from the external environment, and enhancing the stability of the battery cell 20 .

[0114] According to some embodiments of the present application, the insulating film 24 is folded from the flange 229 to the sixth surface 226 and forms a fifth folding area 2261, and the insulating film 24 is folded from the third surface 223 to the sixth surface 226 and forms a sixth folding area 2262. Along the direction of the first surface 221 pointing to the third surface 223, the size L5 of the fifth folding area 2261 is smaller than the size L6 of the sixth folding area 2262.

[0115] Specifically, the insulating film 24 is folded from the flange 229 to the sixth surface 226, which means that the insulating film 24 is bent between the side of the flange 229 facing the first surface 221 and the side of the insulating film 24 facing away from the first surface 221, and extends to the sixth surface 226. The fifth folded region 2261 is the portion of the insulating film 24 that extends from the flange 229 to the sixth surface 226. The insulating film 24 is folded from the third surface 223 to the sixth surface 226, which means that the insulating film 24 is bent at the intersection of the sixth surface 226 and the third surface 223, and extends to the sixth surface 226. The sixth folded region 2262 is the portion of the insulating film 24 that extends from the third surface 223 to the sixth surface 226.

[0116] The dimension L5 of the fifth folding area 2261 refers to the length of the fifth folding area 2261 along the direction from the first surface 221 to the third surface 223. The dimension L6 of the sixth folding area 2262 refers to the length of the sixth folding area 2262 along the direction from the first surface 221 to the third surface 223.

[0117] Through the above method, before the insulating film 24 is folded from the flange 229 and the third surface 223 to the sixth surface 226, the end of the insulating film 24 forming the fifth folded region 2261 and the end of the insulating film 24 forming the sixth folded region 2262 are more similar in size, simplifying the process of wrapping the battery cell 20 with the insulating film 24. Referring to Figures 13 and 14, Figure 13 is a schematic diagram of the structure of the sixth surface of the battery cell according to one or more embodiments; Figure 14 is an enlarged schematic diagram of D in Figure 13. In conjunction with Figures 1 to 12, according to some embodiments of the present application, the battery cell 20 further includes an electrode connector 23, which protrudes from the fourth surface 224 or the sixth surface 226.

[0118] The electrode connector 23 can be used to electrically connect to the electrode assembly 21 to output or input electrical energy from the battery cell 20. In some embodiments, the electrode connector 23 can include a positive electrode connector 23 and a negative electrode connector 23 for outputting current and connecting to an external circuit. The electrode connector 23 can include a terminal post, etc.

[0119] The position of the electrode connector 23 can be set according to actual conditions. For example, in one embodiment, the electrode connector 23 protrudes from the fourth surface 224. In another embodiment, the electrode connector 23 protrudes from the sixth surface 226.

[0120] Through the above method, the electrode connector 23 protrudes from the fourth surface 224 or the sixth surface 226 , thereby enabling connection with an external circuit, and the battery cell 20 is convenient to use.

[0121] According to some embodiments of the present application, the housing 22 includes a top cover 228 and an integrally formed housing body 227 and a flange 229. The housing body 227 includes a bottom wall 2271 and side walls 2272. One end of the side wall 2272 is connected to the bottom wall 2271, and the other end of the side wall 2272 is connected to the flange 229. The top cover 228 is connected to the flange 229 to form the accommodating space 27.

[0122] The sidewall 2272 includes a first sidewall 2272a, a second sidewall 2272b, a third sidewall 2272c, and a fourth sidewall 2272d connected end to end. The first sidewall 2272a is disposed opposite the third sidewall 2272c, and the second sidewall 2272b is disposed opposite the fourth sidewall 2272d.

[0123] The side of the top cover 228 facing away from the housing body 227 forms a first surface 221. The side of the bottom wall 2271 facing away from the top cover 228 forms a third surface 223. The side of the first side wall 2272a facing away from the accommodating space 27 forms a second surface 222. The side of the third side wall 2272c facing away from the accommodating space 27 forms a fourth surface 224. The side of the second side wall 2272b facing away from the accommodating space 27 forms a sixth surface 226. The side of the fourth side wall 2272d facing away from the accommodating space 27 forms a fifth surface 225. The electrode connector 23 is disposed on the fourth surface 224 or the sixth surface 226.

[0124] Specifically, the first sidewall 2272a and the third sidewall 2272c may be located between the second sidewall 2272b and the fourth sidewall 2272d. The accommodation space 27 is used to accommodate the electrode assembly 21.

[0125] The top cover 228 can be the largest side of the housing 22. The shape of the top cover 228 can match the flange 229. For example, if the flange 229 is flat, the top cover 228 can also be flat. Connection methods for the top cover 228 and flange 229 include, but are not limited to, welding, bonding, and clamping.

[0126] By the above method, the top cover 228 can be well connected to the shell body 227 through the flange 229, and the electrode connector 23 extends from the fourth surface 224 or the sixth surface 226 to achieve connection with the external circuit, making the battery cell 20 easy to use.

[0127] Please continue to refer to Figures 1 to 14. According to some embodiments of the present application, the battery cell also includes a top patch 25, a through hole 251 is formed on the top patch 25, the electrode connector 23 is arranged on the sixth surface 226, a portion of the electrode connector 23 is located in the through hole 251, a portion of the sixth surface 226 is exposed between the fifth fold area 2261 and the sixth fold area 2262 for connecting the top patch 25, and the edge of the top patch 25 is connected to the insulating film 24.

[0128] The top patch 25 may be insulating. Functional components may be provided on the top patch 25. In some embodiments, the top patch 25 may also be provided with a vent assembly (not shown) for venting internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The top patch 25 may have a through hole 251 through which the electrode connector 23 passes.

[0129] The portion of the sixth surface 226 exposed between the fifth fold region 2261 and the sixth fold region 2262 can be located near the center of the sixth surface 226. The housing 22 can be connected to the external environment through the portion of the sixth surface 226 exposed between the fifth fold region 2261 and the sixth fold region 2262. The portion of the sixth surface 226 exposed between the fifth fold region 2261 and the sixth fold region 2262 can be exposed through the insulating film 24, or can be formed by the edge of the fifth fold region 2261 and the sixth fold region 2262. The top patch 25 can cover the portion of the sixth surface 226 exposed between the fifth fold region 2261 and the sixth fold region 2262. The electrode connector 23 is located in the portion of the sixth surface 226 exposed between the fifth fold region 2261 and the sixth fold region 2262 and is provided with a through hole 251. The connection method between the top patch 25 and the insulating film 24 includes bonding, welding, etc.

[0130] Through this method, the top patch 25 further isolates the sixth surface 226 from the external environment, preventing scratches on the sixth surface 226 and reducing the risk of short circuits in the battery cell 20. Furthermore, the top patch 25 is securely fixed to the exposed portion of the sixth surface 226 between the fifth folded area 2261 and the sixth folded area 2262. The electrode connector 23 can communicate with the external environment through the fourth window, improving the stability of the battery cell 20.

[0131] 1 to 14 , according to some embodiments of the present application, the insulating film 24 on the sixth surface 226 is overlapped and covers a portion of the sixth surface 226 except the electrode connector 23 .

[0132] The overlapping arrangement of the insulating film 24 at the sixth surface 226 means that the portion of the insulating film 24 extending from the first surface 221 to the sixth surface 226 overlaps the portion of the insulating film 24 extending from the third surface 223 to the sixth surface 226. For example, the portion of the insulating film 24 extending from the first surface 221 to the sixth surface 226 covers a portion of the sixth surface 226. The portion of the insulating film 24 extending from the third surface 223 to the sixth surface 226 covers other portions of the sixth surface 226 and at least partially covers the side of the portion of the insulating film 24 extending from the first surface 221 to the sixth surface 226 facing away from the sixth surface 226.

[0133] Through the above method, the sixth surface 226 of the shell 22 is enclosed in the insulating film 24 and is completely isolated from the external environment, so that the insulation effect of the battery cell 20 is better.

[0134] Please refer to Figures 15 and 16. Figure 15 is a schematic cross-sectional view of line EE in Figure 6; Figure 16 is an enlarged schematic view of line F in Figure 15. In conjunction with Figures 1 to 14, according to some embodiments of the present application, an angle G is formed between the surface adjacent to the first surface 221 and the flange 229. A gap is formed between the insulating film 24 and the housing 22 at the angle. Angle G can be 45 degrees, 90 degrees, or other specific angles. In this embodiment, angle G is 90 degrees.

[0135] The insulating film 24 may be completely in contact with the flange 229 and the surface adjacent to the first surface 221, with a gap formed only at the angle G. Alternatively, the insulating film 24 may be partially in contact with the flange 229 and the surface adjacent to the first surface 221, with gaps formed at the flange 229, the angle G, and the surface adjacent to the first surface 221. The insulating film 24 may be chamfered at the angle G. The insulating film 24 may wrap around the angle G and form a gap with the housing 22.

[0136] Through the above method, the insulating film 24 does not need to be completely in contact with the angle G at the angle, so the insulating film 24 is easier to wrap, and the production of the battery cell 20 is more convenient.

[0137] According to some embodiments of the present application, at the angle G, the housing 22 and the insulating film 24 cooperate to form a closed space 26. The insulating film 24 isolates the closed space 26 from the external environment.

[0138] Through the above method, the shell 22 at the corner is isolated from the external environment in the closed space 26, and the insulating film 24 can also achieve good protection for the shell 22 without being attached to the corner G. The battery cell 20 is easy to produce and has good stability.

[0139] According to some embodiments of the present application, a battery 100 is provided, comprising the battery cell 20 described in any of the above embodiments. The battery 100 may be an energy storage device, for example. An energy storage device is a type of battery 100 that can be used as a power grid, or in household or commercial settings, to store and / or release electrical energy.

[0140] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 described in any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0141] The power-consuming device may be a mobile phone, a computer, a car, or any of the aforementioned devices or systems using the battery 100 .

[0142] Finally, in a specific application scenario, the battery cell 20 includes a shell 22, the shell 22 includes a first surface 221, a second surface 222, and a third surface 223 and a flange 229, the flange 229 is arranged around the first surface 221 and connected to the first surface 221, the first surface 221 and the third surface 223 are opposite, and the second surface 222 is connected between the flange 229 and the third surface 223; and an insulating film 24, wrapped around the outside of the shell 22, the insulating film 24 wraps at least a portion of the first surface 221, at least a portion of the flange 229, at least a portion of the third surface 223 and at least a portion of the second surface 222; wherein the insulating film 24 is folded from the flange 229 to the second surface 222 and forms a first folding area 2221, and the insulating film 24 is folded from the third surface 223 to the second surface 222 and forms a second folding area 2222, and along the direction from the first surface 221 to the third surface 223, the size of the first folding area 2221 is smaller than the size of the second folding area 2222. Through the above method, the first surface 221, the flange 229, the third surface 223 and the second surface 222 are all wrapped with the insulating film 24. When the shell 22 is provided with the flange 229, the insulating film 24 can also be fully wrapped to the shell 22. The shell 22 is well protected by the insulating film 24, and the stability of the battery cell 20 is improved.

[0143] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A shell, the shell comprising a first surface, a second surface, a third surface and a flange, the flange is arranged around the first surface and connected to the first surface, the first surface and the third surface are opposite to each other, and the second surface is connected between the flange and the third surface; as well as an insulating film, wrapped around the outside of the shell, the insulating film wrapping at least a portion of the first surface, at least a portion of the flange, at least a portion of the third surface, and at least a portion of the second surface; The insulating film is folded from the flange to the second surface to form a first folded area, and the insulating film is folded from the third surface to the second surface to form a second folded area. Along the direction from the first surface to the third surface, the size of the first folded area is smaller than the size of the second folded area.

2. The battery cell according to claim 1, characterized in that: The insulating film is an integral structure.

3. The battery cell according to any one of claims 1 to 2, characterized in that: A portion of the second surface is exposed between the first folding area and the second folding area for connecting with a first colloid or a first insulating sheet.

4. The battery cell according to any one of claims 1 to 2, characterized in that: The first folding area and the second folding area are overlapped.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The fourth surface of the shell is arranged opposite to the second surface, the insulating film is folded from the flange to the fourth surface to form a third folded area, the insulating film is folded from the third surface to the fourth surface to form a fourth folded area, and along the direction pointing from the first surface to the third surface, the size of the third folded area is smaller than the size of the fourth folded area.

6. The battery cell according to claim 5, characterized in that: A portion of the fourth surface is exposed between the third folding area and the fourth folding area for connecting the second colloid or the second insulating sheet.

7. The battery cell according to claim 5, characterized in that: The third folding area and the fourth folding area are overlapped.

8. The battery cell according to any one of claims 5 to 7, characterized in that: The fifth surface of the shell is disposed adjacent to the first surface and the third surface, and the fifth surface of the shell is also disposed adjacent to the second surface and the fourth surface, and the insulating film completely covers the fifth surface.

9. The battery cell according to claim 8, characterized in that: The sixth surface of the shell is arranged opposite to the fifth surface, the sixth surface of the shell is located between the second surface and the fourth surface, and the sixth surface of the shell is also located between the first surface and the third surface, and the insulating film covers at least a portion of the sixth surface.

10. The battery cell according to claim 9, characterized in that: The insulating film is folded from the flange to the sixth surface to form a fifth folding zone, and the insulating film is folded from the third surface to the sixth surface to form a sixth folding zone. Along the direction from the first surface to the third surface, the size of the fifth folding zone is smaller than the size of the sixth folding zone.

11. The battery cell according to claim 9 or 10, characterized in that: The battery cell further includes an electrode connector, and the electrode connector protrudes from the fourth surface or the sixth surface.

12. The battery cell according to any one of claims 9 to 11, characterized in that: The housing comprises a top cover and an integrally formed housing body and a flange, the housing body comprises a bottom wall and a side wall, one end of the side wall is connected to the bottom wall, and the other end is connected to the flange, and the top cover is connected to the flange to form an accommodating space; The side wall comprises a first side wall, a second side wall, a third side wall and a fourth side wall which are connected end to end in sequence, the first side wall is arranged opposite to the third side wall, and the second side wall is arranged opposite to the fourth side wall; A side of the top cover facing away from the shell body forms the first surface, a side of the bottom wall facing away from the top cover forms the third surface, a side of the first side wall facing away from the accommodating space forms the second surface, a side of the third side wall facing away from the accommodating space forms the fourth surface, a side of the second side wall facing away from the accommodating space forms the sixth surface, and a side of the fourth side wall facing away from the accommodating space forms the fifth surface.

13. The battery cell according to claim 10, characterized in that: The battery cell also includes a top patch, which is formed with a through hole, an electrode connector is arranged on the sixth surface, a portion of the electrode connector is located in the through hole, a portion of the sixth surface is exposed between the fifth folding area and the sixth folding area for connecting the top patch, and the edge of the top patch away from the electrode connector is connected to the insulating film.

14. The battery cell according to claim 11, characterized in that: The insulating film at the sixth surface is overlapped and covers a portion of the sixth surface except the electrode connector.

15. The battery cell according to any one of claims 1 to 14, characterized in that: An angle is formed between a surface adjacent to the first surface and the flange, and a gap is formed between the insulating film and the housing at the angle.

16. The battery cell according to claim 15, characterized in that: At the angle, the shell and the insulating film cooperate to form a closed space.

17. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 16.

18. An electrical device, characterized in that: The electrical device comprises a battery, wherein the battery is the battery according to claim 17, and the battery supplies power to the electrical device.

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