Battery monomer and power utilization device

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer and a power utilization device. Each battery monomer comprises a naked battery cell, an end cover and a shell; at least one end of the shell along the first direction is provided with an opening; the opening is matched with an end cover of the battery monomer; the electrophoresis film layer covers the inner surface and the outer surface of the shell. And the electrophoresis film layer plays a role in electrical insulation, so that electrical isolation between the shell and components such as the naked battery cell is realized, other insulation structures are not needed, and the structure is simple. In addition, the electrophoresis film layer utilizes an electrophoresis technology, so that charged coating particles sink on the surface of the shell to form a compact and uniform thin film, the thin film basically has no local missing area, and the insulation reliability is high.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell and an electrical device using the same. Background Art

[0002] In related technologies, the outer shell of a battery cell includes a metal casing and an insulating layer (such as painting or pasting an insulating film) provided on the inner surface of the metal casing. A blue insulating film is sleeved on the outer surface of the metal casing. The insulating layer is used for electrically isolating the metal casing and the bare battery core to prevent the bare battery core from contacting the metal casing and causing a short circuit. However, for the painting method, the thickness of the paint layer is uneven, and there is also an easy occurrence of local non-spraying, resulting in insulation risks. For the method of pasting an insulating film, the operation is relatively troublesome, and the complete fitting of the insulating film and the metal casing cannot be guaranteed.

[0003] Therefore, how to improve the insulation reliability of the battery is a technical problem that urgently needs to be solved in the technical field of batteries. Utility Model Content

[0004] To solve the above technical problems, this application provides a battery cell and an electrical device using the same, aiming to improve the insulation reliability of the battery.

[0005] This application is achieved through the following technical solutions.

[0006] In a first aspect of this application, a battery cell is provided, including:

[0007] A casing having an opening at at least one end along a first direction;

[0008] An end cap closing the opening;

[0009] A bare battery core disposed inside the casing;

[0010] An electrophoretic film layer covering the inner surface and the outer surface of the casing.

[0011] The electrophoretic film layer plays a role in electrical insulation, achieving electrical isolation between components such as the casing and the bare battery core. In this way, there is no need to set up other insulation structures, and the structure is simple. In addition, the electrophoretic film layer uses electrophoretic technology to deposit charged paint particles on the surface of the casing to form a dense and uniform thin film. There are basically no regions with local omissions in this thin film, and the insulation reliability is high.

[0012] In some embodiments, the inner surface and the outer surface of the casing are completely covered by the electrophoretic film layer.

[0013] In this embodiment, during the electrophoretic process, the casing can be completely placed in the electrophoresis tank without the need for additional shielding on the surface of the casing, which is beneficial to simplifying the process flow and reducing production costs. After the electrophoresis is completed, the electrophoretic film layer can cover all surfaces of the casing.

[0014] In some embodiments, one end of the inner surface and / or the outer surface of the housing near the opening has a blank area not covered by the electrophoresis film layer, and the blank area is used for connecting with the end cap.

[0015] The existence of the blank area helps to prevent the high temperature generated by welding the end cap to the housing from damaging the electrophoresis film layer, and also prevents the friction during riveting the end cap to the housing from damaging the electrophoresis film layer, thereby avoiding contact short circuit between the battery cell and the housing.

[0016] In some embodiments, the dimension of the blank area along the first direction does not exceed 10 millimeters.

[0017] The blank area with such a dimension can ensure that it has sufficient size to connect with the end cap, and after the end cap is connected, it will not be exposed in the space where the bare battery cell is located, thereby reducing the probability of short circuit between the bare battery cell and the housing. At the same time, the end cap will not exceed the blank area when connecting to the housing, which is beneficial to protecting the electrophoresis film layer.

[0018] In some embodiments, openings are formed at both opposite ends of the housing along the first direction.

[0019] The design of openings at both ends enables end caps to be assembled at both ends of the housing, and the end cap can assemble pole columns, balance valves, etc. At this time, there are positive and negative pole columns at both ends of the battery monomer to connect the circuit.

[0020] In some embodiments, the housing includes a shell side wall and a shell bottom wall. One end of the shell side wall along the first direction forms the opening, and the shell bottom wall closes the end of the housing away from the opening. A part of the shell bottom wall bulges inward to form a boss, and the boss is used to carry the bare battery cell.

[0021] The boss can not only support the bare battery cell, but also avoid the extrusion of the bare battery cell with the fillet at the bottom end of the shell side wall, thereby improving the service life of the battery monomer. In addition, the pallet for supporting the bare battery cell in the related art can be omitted, and the structure is simpler, which is beneficial to improving the mass energy density of the battery monomer.

[0022] In some embodiments, the cross-sectional shape of the housing perpendicular to the first direction is circular or rectangular.

[0023] The structure of the circular battery monomer has uniform stress and higher anti-extrusion ability. In addition, the circular battery monomer has a larger surface area to volume ratio, which can dissipate heat more effectively and reduce the working temperature of the battery monomer. The edges of the square battery monomer are flat, which is beneficial to assembling and fixing the battery monomer in the electrical device, thereby ensuring stable energy supply.

[0024] In some embodiments, the thickness of the electrophoretic film layer does not exceed 50 microns.

[0025] If the electrophoretic film layer is too thick, it may cause problems such as uneven film surface and blistering. In this embodiment, controlling it below 50 microns is beneficial to ensure the uniformity and quality of the electrophoretic film layer.

[0026] In some embodiments, the thickness of the electrophoretic film layer is 10 microns to 25 microns.

[0027] The thickness range of the electrophoretic film layer in this embodiment is beneficial to improving the adhesion between the electrophoretic film layer and the housing. The electrophoretic film layer is not easily detached. In addition, it also makes the electrophoretic film layer not easily damaged, improving the durability and stability of the electrophoretic film layer.

[0028] The battery cell provided by the embodiment of the present application covers an electrophoretic film layer on the inner and outer surfaces of the housing through an electrophoretic process. This electrophoretic film layer can protect the outer surface of the housing from the influence of the external environment, and can also prevent the bare battery core from contacting the metal housing and causing a short circuit, improving the insulation reliability of the battery cell. In addition, this kind of battery cell omits the independent components used to isolate the bare battery core and the housing, and has a high-quality energy density.

[0029] In a second aspect, the embodiment of the present application provides an electrical device including the battery cell according to any embodiment of the present application. Description of the Drawings

[0030] By reading the detailed description of the preferred embodiments below, 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. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of the housing of a battery cell according to an embodiment of the present application;

[0033] Figure 3 is a schematic structural diagram of the housing of a battery cell according to the second embodiment of the present application;

[0034] Figure 4 is a schematic structural diagram of the housing of a battery cell according to the third embodiment of the present application;

[0035] Figure 5 is a schematic structural diagram of the housing of a battery cell according to the fourth embodiment of the present application;

[0036] Figure 6 is Figure 5Schematic view of another perspective of the battery cell shown;

[0037] Figure 7 is Figure 6 A - A sectional view of the battery cell shown;

[0038] Figure 8 is Figure 5 Axonometric view of another perspective of the battery cell shown.

[0039] Description of reference numerals

[0040] 1000, vehicle;

[0041] 100, battery cell; 200, controller; 300, motor;

[0042] 111, housing; 111a, inner surface; 111b, outer surface; 112, electrophoretic film layer;

[0043] 1111, housing side wall; 1112, housing bottom wall; 1113, opening; 1111a, blank area; 1112a, boss. Detailed implementation manners

[0044] Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawing descriptions are intended to cover non - exclusive inclusion.

[0046] In the description of the embodiments of this application, technical terms such as "first", "second", "third", etc. 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 this application, "a plurality" means more than two unless otherwise specifically defined.

[0047] 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 the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0049] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "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 the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present 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 the present application can be understood according to specific circumstances.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense. It can be direct contact, or contact through an intermediate medium layer. It can be contact where there is basically no mutual force between the two in contact, or contact where there is a mutual force between the two in contact.

[0052] Next, the present application will be described in detail.

[0053] In the related art, the housing of a battery cell includes a metal housing and an insulating layer (such as painting or pasting an insulating film) provided on the inner surface of the metal housing. And a blue insulating film is sleeved on the outer surface of the metal housing. The insulating layer is used for electrically isolating the metal housing and the bare battery cell to prevent the bare battery cell from contacting the metal housing and causing a short circuit. However, for the painting method, the thickness of the paint layer is uneven, and there is also an easy phenomenon of local non-spraying, which leads to insulation risks. For the method of pasting an insulating film, the operation is relatively troublesome, and the complete fitting of the insulating film and the metal housing cannot be guaranteed.

[0054] Therefore, how to improve the insulation reliability of the battery cell is a technical problem that urgently needs to be solved in the battery technology field.

[0055] In view of the above problems, the embodiments of the present application provide a battery cell, including a housing, an end cover, a bare battery cell, and an electrophoretic film layer. At least one end of the housing in the first direction has an opening. The end cover closes the opening. The bare battery cell is disposed in the housing, and the electrophoretic film layer covers the inner surface and the outer surface of the housing.

[0056] The end cover cooperates with the opening of the housing to provide a closed space, which can protect the components inside the battery cell. The electrophoretic film layer plays an electrical insulation role to achieve electrical isolation, so that other insulation structures do not need to be provided, and the structure is simple. In addition, the electrophoretic film layer uses electrophoretic technology to make charged paint particles deposit on the surface of the housing to form a dense and uniform thin film, and there are basically no regions with local omission in this thin film, and the insulation reliability is high.

[0057] The embodiments of the present application provide an electrical device, including the battery cell according to any embodiment of the present application. The battery cell can provide electrical energy for the electrical device.

[0058] The electrical device provided by the embodiments of the present application can be but not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecrafts, etc. Among them, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

[0059] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as the vehicle 1000 as an example for description. The following is described with reference to the drawings.

[0060] Figure 1 It is a schematic structural diagram of the vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc. As Figure 1As shown, a battery 100 is disposed inside a vehicle 1000, and the battery includes one or more battery cells. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is configured to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0061] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] Please refer to Figure 4 or Figure 5 , an embodiment of the present application provides a battery cell, including a housing 111, an end cap (not marked in the drawings), a bare electrochemical cell (not marked in the drawings), and an electrophoretic film layer 112. At least one end of the housing 111 in the first direction has an opening 1113, and the opening 1113 is used to cooperate with the end cap of the battery 100. The electrophoretic film layer 112 covers the inner surface 111a and the outer surface 111b of the housing 111.

[0063] The end cap and the housing 111 are the main structural components of the external structure of the battery cell 100. Electrodes, a balance valve, etc. can be provided on the end cap. The end cap and the housing 111 are hermetically fitted to define a closed space for accommodating the bare electrochemical cell and other structures.

[0064] A bare electrochemical cell refers to an individual electrochemical cell containing positive and negative electrodes without packaging or encapsulation.

[0065] The electrophoretic film layer 112 refers to a thin film formed by depositing charged paint particles on the surface area of the housing 111 by using electrophoretic technology.

[0066] It should be noted that the shape of the opening 1113 is not limited and can be square or circular.

[0067] The housing 111 has an opening 1113 at at least one end in the first direction, including two cases: First, please refer to Figure 3 , one end of the housing 111 in the first direction has an opening 1113, and the other end in the first direction has no opening 1113. Second, please refer to Figure 4 , both ends of the housing 111 in the first direction have openings 1113.

[0068] The first direction please refer to Figure 4 the direction marked.

[0069] The electrophoresis film layer 112 functions as electrical insulation, achieving electrical isolation between the housing 111 and components such as the bare battery cell. Thus, no other insulation structure needs to be provided, and the structure is simple. In addition, the electrophoresis film layer 112 uses electrophoresis technology to deposit charged paint particles on the surface area of the housing 111 to form a dense and uniform thin film, and there are basically no areas with local omissions in this thin film, so the insulation reliability is high.

[0070] In some embodiments, the material of the housing 111 can be selected but is not limited to aluminum alloy or stainless steel. The end cap can be connected to the opening 1113 of the housing 111 by means such as welding or riveting.

[0071] In some embodiments, please refer to Figure 2 , the inner surface 111a and the outer surface 111b of the housing 111 are completely covered by the electrophoresis film layer 112. That is to say, the electrophoresis film layer 112 completely covers all surfaces of the housing 111.

[0072] In this embodiment, during electrophoresis, the housing 111 can be completely placed in the electrophoresis tank, and no additional shielding needs to be done on the surface of the housing 111, which is beneficial to simplifying the process flow and reducing production costs. After electrophoresis, the electrophoresis film layer 112 can cover all surfaces of the housing 111.

[0073] In other embodiments, please refer to Figure 3 , one end of the inner surface 111a and / or the outer surface 111b of the housing 111 close to the opening 1113 has a blank area 1111a that is not covered by the electrophoresis film layer 112, and the blank area 1111a is used for connecting with the end cap.

[0074] The blank area 1111a refers to the area of the housing 111 that is not covered by the electrophoresis film layer 112.

[0075] It can be understood that the one end of the inner surface 111a and / or the outer surface 111b of the above-mentioned housing 111 close to the opening 1113 has a blank area 1111a that is not covered by the electrophoresis film layer 112, including three situations: First, only the inner surface 111a of the housing 111 is provided with a blank area 1111a, and the outer surface 111b has no blank area 1111a. Second, both the inner surface 111a and the outer surface 111b of the housing 111 are provided with blank areas 1111a. Third, only the outer surface 111b of the housing 111 is provided with a blank area 1111a, and the inner surface 111a has no blank area 1111a.

[0076] It should be noted that in the case where both the inner surface 111a and the outer surface 111b of the housing 111 have blank areas 1111a, when one end of the housing 111 is open 1113 in the first direction, there are 2 blank areas 1111a on the housing 111. Please refer to Figure 3 ; when both opposite ends of the housing 111 are open 1113 in the first direction, there are 4 blank areas 1111a on the housing 111. Please refer to Figure 4 .

[0077] The existence of the blank area 1111a is beneficial to preventing the high temperature generated by the welding of the end cap and the housing 111 from damaging the electrophoresis film layer 112, and can also prevent the friction during the riveting of the end cap and the housing 111 from damaging the electrophoresis film layer 112, thereby avoiding contact short circuit between the battery cell and the housing 111.

[0078] In some embodiments, please refer to Figure 5 or Figure 7 , the dimension d1 of the blank area 1111a in the first direction does not exceed 10 millimeters. For example, 5 millimeters, 6 millimeters, 7 millimeters, 8 millimeters, 9 millimeters, 10 millimeters, etc.

[0079] The dimension of the blank area 1111a in the first direction refers to the maximum dimension of the blank area 1111a in the first direction, that is Figure 5 the d1 shown.

[0080] The blank area 1111a with such a dimension can ensure that it has enough size to connect with the end cap, and after the end cap is connected, it will not be exposed in the space where the bare battery cell is located, thereby reducing the probability of short circuit between the bare battery cell and the housing 111. At the same time, the end cap will not exceed the blank area 1111a when connecting the housing 111, which is beneficial to protecting the electrophoresis film layer 112.

[0081] In some embodiments, please refer to Figure 4 , both opposite ends of the housing 111 are formed with openings 1113 in the first direction.

[0082] The design of the two ends being open 1113 enables end caps to be assembled at both ends of the housing 111, and the end caps can assemble pole columns, balance valves, etc. At this time, there are positive and negative pole columns at both ends of the battery monomer to connect the circuit.

[0083] In some embodiments, please refer to Figure 7 or Figure 8, the housing 111 includes a housing side wall 1111 and a housing bottom wall 1112. One end of the housing side wall 1111 in the first direction forms an opening 1113, and the housing bottom wall 1112 closes one end of the housing 111 far from the opening 1113. A part of the housing bottom wall 1112 bulges inward to form a boss 1112a, and the boss 1112a is used to carry the bare battery cell. That is to say, in this embodiment, only one end of the housing 111 has an opening 1113, and the other end is closed.

[0084] The housing side wall 1111 and the housing bottom wall 1112 are the main structural components of the housing 111.

[0085] The bare battery cell is a component in the battery cell 100 where an electrochemical reaction occurs. One or more bare battery cells may be included in the housing 111. The bare battery cell is mainly formed by winding electrode plates (a positive electrode plate and a negative electrode plate), and a separator is usually provided between the positive electrode plate and the negative electrode plate. The parts of the electrode plates (positive electrode plate and negative electrode plate) with active materials constitute the main body of the bare battery cell, and the main body is connected to the tab. The positive tab and the negative tab may be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery cell, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the terminal posts to form a current loop.

[0086] The boss 1112a is a locally protruding part of the housing bottom wall 1112 and is used to support the bare battery cell.

[0087] It should be noted that the number of the bosses 1112a is not limited, and it can be 1 or multiple. Exemplarily, please refer to Figure 8 , the number of the bosses 1112a is 3.

[0088] The boss 1112a can not only support the bare battery cell, but also prevent the bare battery cell from being squeezed by the rounded corner at the bottom end of the housing side wall 1111, thereby improving the service life of the battery cell. In addition, the pallet used to support the bare battery cell in the related art can be omitted, the structure is simpler, and it is beneficial to improve the mass energy density of the battery cell.

[0089] In some embodiments, the cross-sectional shape of the housing 111 perpendicular to the first direction is circular or rectangular.

[0090] It should be noted that when the cross-sectional shape of the housing 111 perpendicular to the first direction is circular, the shape of the opening 1113 is also circular; when the cross-sectional shape of the housing 111 perpendicular to the first direction is rectangular, the shape of the opening 1113 is also rectangular. Please refer to Figure 5 .

[0091] The structure of the circular battery cell is subject to uniform stress and has a higher anti-extrusion ability. In addition, the circular battery cell has a larger surface area to volume ratio, which can dissipate heat more effectively and reduce the operating temperature of the battery cell. The edges of the square battery cell are flat, which is beneficial to assembling and fixing the battery cell in the electrical device, thus ensuring a stable energy supply.

[0092] In some embodiments, the thickness of the electrophoresis film layer 112 does not exceed 50 microns.

[0093] If the electrophoresis film layer 112 is too thick, it may cause problems such as uneven film surface and blistering. In this embodiment, controlling it below 50 microns is beneficial to ensuring the uniformity and quality of the electrophoresis film layer 112.

[0094] In some embodiments, the thickness of the electrophoresis film layer 112 is 10 microns to 25 microns. For example, 10 microns, 12 microns, 15 microns, 17 microns, 20 microns, 22 microns, 25 microns, etc.

[0095] The thickness range of the electrophoresis film layer 112 in this embodiment is beneficial to improving the adhesion between the electrophoresis film layer 112 and the housing 111, making the electrophoresis film layer not easy to fall off. In addition, it also makes the electrophoresis film layer 112 not easy to be damaged, improving the durability and stability of the electrophoresis film layer 112. The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing, wherein at least one end of the housing along a first direction has an opening; an end cap, the end cap closing the opening; A bare battery cell is disposed in the housing; An electrophoretic film layer covers the inner surface and the outer surface of the shell.

2. The battery cell according to claim 1, characterized in that: The inner surface and the outer surface of the shell are completely covered by the electrophoretic film layer.

3. The battery cell according to claim 1, characterized in that: The inner surface and / or the outer surface of the shell has a blank area at one end close to the opening which is not covered by the electrophoretic film layer, and the blank area is used to be connected to the end cover.

4. The battery cell according to claim 3, characterized in that: The size of the blank area along the first direction does not exceed 10 mm.

5. The battery cell according to claim 1, characterized in that: The openings are formed at opposite ends of the housing along the first direction.

6. The battery cell according to claim 1, characterized in that: The shell includes a shell side wall and a shell bottom wall, the shell side wall forms the opening at one end along the first direction, the shell bottom wall closes the end of the shell away from the opening, and a portion of the shell bottom wall protrudes inward to form a boss, which is used to support the bare battery cell.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The cross-section of the shell perpendicular to the first direction is circular or rectangular.

8. The battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the electrophoretic film layer does not exceed 50 microns.

9. The battery cell according to claim 8, characterized in that: The thickness of the electrophoretic film layer is 10 microns to 25 microns.

10. An electrical device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

Images