Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly and a shell. The shell comprises a first packaging film and a second packaging film arranged oppositely along the thickness direction of the battery monomer. The first packaging film comprises a first main body part and a first connecting part arranged around the first main body part. A containing space is formed between the first main body part and the second packaging film. The electrode assembly is arranged in the containing space. The first connecting part is connected with the second packaging film and forms a sealing area. The sealing area is arranged along the outer periphery of the containing space. The first connecting part comprises a first protruding part. At least part of the first protruding part is arranged between the containing space and the sealing area. The first protruding part is arranged protrudingly in the direction away from the second packaging film. The first connecting part is provided with a first recess part on the side facing the second packaging film. The first recess part is in position correspondence with the first protruding part. The application can improve the reliability of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

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

[0003] In the development of battery technology, improving the reliability of individual battery cells has always been a research direction. Summary of the Invention

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

[0005] In a first aspect, this application provides a battery cell, a battery device, and an electrical device. The battery cell includes an electrode assembly and a housing. The housing includes a first encapsulation film and a second encapsulation film disposed opposite each other along the thickness direction of the battery cell. The first encapsulation film includes a first main body portion and a first connecting portion disposed around the first main body portion. A receiving space is formed between the first main body portion and the second encapsulation film. The electrode assembly is disposed in the receiving space. The first connecting portion is connected to the second encapsulation film and forms a sealing region, which is disposed along the outer periphery of the receiving space. The first connecting portion includes a first protrusion, at least a portion of which is disposed between the receiving space and the sealing region. The first protrusion protrudes in a direction away from the second encapsulation film, and the first connecting portion has a first recess on the side facing the second encapsulation film, the first recess corresponding to the first protrusion.

[0006] In the above solution, by setting a first protrusion and a first concave part at the corresponding position, the expansion force when the battery cell expands during operation will cause the first main body to deform outward, thereby pulling the first protrusion and the first concave part, changing the shape of the first protrusion, thus dispersing the expansion force, reducing the possibility of damage to the first main body, and improving the reliability of the battery cell.

[0007] In some embodiments, the first connecting portion includes two first protrusions, which are disposed on opposite sides of the receiving space along a first direction, the first direction intersecting the thickness direction.

[0008] In the above scheme, through the above settings, the expansion force when the battery cell expands during operation will cause the first main body to deform outward, thereby pulling the two first protrusions and dispersing the expansion force to opposite sides, thereby reducing the possibility of excessive local stress causing the casing to deform or even break, improving the uniformity of stress received by the casing, and improving the reliability of the battery cell.

[0009] In some embodiments, the first connecting portion includes a plurality of first protrusions, which are disposed on the periphery of the receiving space, and at least a portion of the first protrusions are connected to corresponding first recesses.

[0010] In the above scheme, the above settings enable the stress acting on the first encapsulation film to be distributed among the multiple first recesses, thereby reducing the possibility of local stress concentration, enhancing the structural stability of the first encapsulation film, and improving the reliability of the battery cell.

[0011] In some embodiments, the first connecting portion further includes a first transition portion, the first protrusion is connected to the first main body portion through the first transition portion, and a gap is provided between the first transition portion and the second encapsulation film.

[0012] In the above scheme, by setting a gap, the possibility of interference between the first transition part and the second encapsulation film is reduced, thereby reducing the manufacturing precision of the first encapsulation film. At the same time, it makes it easier for the expansion force when the battery cell expands and deforms to pull the first protrusion, thereby reducing the possibility of the expansion force pulling the periphery of other rooms in the accommodating space that do not have the first protrusion, thus reducing the possibility of shell damage and improving the reliability of the battery cell.

[0013] In some embodiments, the battery cell further includes an electrode terminal, a portion of which is located between and connected to the first connection portion and the second encapsulation film. The electrode assembly includes a body portion and a tab, the tab protruding from one edge of the body portion along a first direction, one end of the electrode terminal being electrically connected to the tab, and the other end of the electrode terminal located on the outer side of the housing. At least a portion of the projection of the first protrusion along the thickness direction overlaps with the projection of the tab along the thickness direction.

[0014] In the above scheme, the above arrangement helps to increase the arrangement area of ​​the first protrusion, improve the arrangement flexibility of the first protrusion, reduce the expansion force pulling the connection area between the electrode terminal and the shell when the battery cell expands and deforms, thereby reducing the possibility of separation between the electrode terminal and the shell and improving the reliability of the battery cell.

[0015] In some embodiments, the first protrusion includes a first portion and a second portion connected along a second direction. The projection of the first portion along the thickness direction overlaps with the projection of the tab along the thickness direction. The projection of the second portion along the thickness direction is spaced apart from the projection of the tab along the thickness direction. The side of the second portion away from the second encapsulation film does not exceed the side of the first portion away from the second encapsulation film. The first direction, the second direction, and the thickness direction intersect each other.

[0016] In the above scheme, the first part and the second part can be designed differently or uniformly according to design requirements, thereby improving the design flexibility of the first protrusion and thus increasing the applicability of the battery cell.

[0017] In some embodiments, the second encapsulation film includes a second convex portion and a second concave portion, wherein at least a portion of the second convex portion is disposed between the receiving space and the sealing region, and the second concave portion corresponds to the position of the second convex portion.

[0018] In the above solution, by setting a second protrusion and a second concave part at the corresponding position, the expansion force when the battery cell expands during operation will cause the second encapsulation film to deform outward, thereby pulling the second protrusion and the second concave part, changing the shape of the second protrusion, thereby dispersing the expansion force, reducing the possibility of damage to the second encapsulation film, and improving the reliability of the battery cell.

[0019] In some embodiments, the second protrusion protrudes in a direction away from the first encapsulation film, and the second encapsulation film has a second recess on the side facing the first encapsulation film.

[0020] In the above scheme, the above settings help to simplify the preparation of the second protrusion, so that the first encapsulation film and the second encapsulation film can be prepared and formed according to the same preparation tooling, thereby reducing the preparation cost.

[0021] In some embodiments, the second protrusion protrudes in a direction toward the first encapsulation film, and at least a portion of the second protrusion is located within the first recess, wherein the second encapsulation film has a second recess on the side opposite to the first encapsulation film.

[0022] In the above scheme, by setting up the above, the space occupied by the first protrusion and the second protrusion in the thickness direction is reduced, thereby reducing the possibility of interference between the first protrusion, the second protrusion and other devices, and reducing the overall size of the battery cell.

[0023] In some embodiments, the projections of the first protrusion along the thickness direction and the projections of the second protrusion along the thickness direction at least partially overlap.

[0024] In the above scheme, the above settings help to improve the stress uniformity of the first and second encapsulation films, reduce the possibility of the first and second encapsulation films separating due to the different stress dispersion directions, and improve the reliability of the battery cell.

[0025] In some embodiments, the projections of the first protrusion along the thickness direction and the projections of the second protrusion along the thickness direction are spaced apart.

[0026] In the above scheme, the above arrangement helps to improve the flexibility of the arrangement of the first protrusion and the second protrusion, so that the first protrusion and the second protrusion can be specifically improved to enhance the anti-expansion performance of the shell according to the design requirements, thereby improving the reliability of the battery cell.

[0027] In some embodiments, the second encapsulation film includes a second body portion and a second connecting portion disposed around the second body portion, a receiving space is formed between the first body portion and the second body portion, the first connecting portion and the second connecting portion are connected to form a sealing area, and the second connecting portion includes a second protrusion and a second recess.

[0028] In the above scheme, by setting a second main body, it is beneficial to increase the storage space and improve the range of the battery cell; by setting a second connecting part, the first connecting part and the second connecting part can share the same manufacturing tooling, reducing manufacturing costs and improving production efficiency.

[0029] In some embodiments, the cross-sectional shape of the first protrusion along the direction perpendicular to the extension of the first protrusion includes one or a combination of triangle, quadrilateral, ellipse, and circle.

[0030] The above scheme improves the flexibility of the arrangement of the first protrusion, which can be adjusted according to design requirements, and helps to control the stretching direction and stretching amount of the first encapsulation film.

[0031] In some embodiments, the thickness of the outer shell is D, where 0.08 mm ≤ D ≤ 0.2 mm.

[0032] In the above scheme, setting the thickness of the outer shell to be greater than or equal to 0.08 helps to improve the mechanical strength of the outer shell; setting the thickness of the outer shell to be less than or equal to 0.2 makes the first and second protrusions easier to stretch, thereby reducing the force of the electrode assembly on the outer shell, reducing the possibility of the outer shell cracking, and improving the reliability of the battery cell.

[0033] In some embodiments, the dimension of the first protrusion along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the first protrusion.

[0034] In the above scheme, the stress on the first protrusion is increased, the stress on the first main body is further dispersed, making the first protrusion easier to stretch. In addition, the tensile deformation of the first protrusion can be increased, thereby increasing the overall size of the space after stretching, improving the resistance to expansion deformation of the battery cell, and improving the reliability of the battery cell.

[0035] In some embodiments, the outer edge length of the first protrusion along the cross-section perpendicular to its own extension direction is L, and the capacity of the battery cell is C. 2mm≤L≤6mm, 0.5Ah≤C≤30Ah; or, 5mm≤L≤10mm, 30Ah≤C≤100Ah; or, 5mm≤L≤15mm, 100Ah≤C≤300Ah.

[0036] In the above scheme, the above settings reduce redundant settings of the first protrusion, increase the stretchability of the first protrusion, reduce manufacturing costs, and improve the reliability of the battery cell.

[0037] In some embodiments, the electrode assembly includes a positive electrode, an electrolyte, and a negative electrode. The negative electrode includes a negative current collector and an active material layer disposed on at least one side of the negative current collector. The active material layer includes an elemental active metal. This reduces the internal resistance of the battery cell, improves its conductivity, and enhances its overall performance.

[0038] In some embodiments, the active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum. This expands the range of materials that can be selected for the battery cell and broadens its applicability.

[0039] In some embodiments, the electrolyte includes a solvent, which includes at least one of ether solvents or ester solvents. This expands the range of materials that can be selected for the battery cell and broadens its applicability.

[0040] In some embodiments, the solvent includes ether solvents, comprising at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane. These ether solvents are compatible with various battery cells, particularly improving the applicability of battery cells.

[0041] Secondly, embodiments of this application provide a battery device, including the battery cell in any of the foregoing embodiments.

[0042] Thirdly, embodiments of this application provide an electrical device, including the battery device in any of the foregoing embodiments, the battery device being used to provide electrical energy to the electrical device.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0046] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0049] Figure 5 This is a top view of a single battery cell provided in an embodiment of this application;

[0050] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure of AA;

[0051] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure of Q;

[0052] Figure 8 This is a top view structural diagram of another battery cell provided in the embodiments of this application;

[0053] Figure 9 This is a top view structural diagram of another battery cell provided in the embodiments of this application;

[0054] Figure 10 yes Figure 4 A magnified schematic diagram of P in the middle;

[0055] Figure 11 yes Figure 8 A schematic diagram of a cross-sectional structure of BB;

[0056] Figure 12 yes Figure 11 A magnified schematic diagram of the S-shaped structure;

[0057] Figure 13 yes Figure 8 Another cross-sectional structural diagram of BB;

[0058] Figure 14 yes Figure 13 A magnified schematic diagram of the T-shaped structure;

[0059] Figure 15 yes Figure 8 Another cross-sectional structural diagram of BB;

[0060] Figure 16 yes Figure 15 A magnified schematic diagram of the V-shaped structure.

[0061] Marker description

[0062] 1000, vehicles;

[0063] 100. Battery assembly; 110. Battery cell; 200. Controller; 300. Motor; 400. Housing; 410. First housing section; 420. Second housing section; 430. Receiving section; 500. Battery module;

[0064] 10. Electrode assembly; 11. Main body; 12. Electrode tab;

[0065] 20. Outer shell; 21. First encapsulation film; 211. First main body portion; 212. First connecting portion; 2121. First protrusion; 2121a. First part; 2121b. Second part; 2122. First recess; 2123. First transition portion; 22. Second encapsulation film; 221. Second main body portion; 222. Second connecting portion; 2221. Second protrusion; 2222. Second recess; 2223. Second transition portion;

[0066] 30. Electrode terminal; 40. Insulating component; X, first direction; Y, second direction; Z, thickness direction. Detailed Implementation

[0067] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0069] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0070] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0071] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0072] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0073] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0074] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0075] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0076] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0077] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0078] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0079] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0080] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0082] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0083] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0084] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0085] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0086] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0087] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0088] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0089] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0090] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0091] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0092] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0093] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0094] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0095] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0096] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0097] With the continuous development of battery cells, they are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in military equipment and aerospace, resulting in an explosive growth in the demand for battery cells.

[0098] In the development of battery technology, the reliability of individual battery cells directly affects the reliability, cost of use, and user experience of end products. Pouch cells typically consist of a casing and electrode components housed within it. The casing assembly process usually involves stacking two encapsulation films and then sealing them in a vacuum environment. Heating and pressurizing the outer periphery of the electrode components on the encapsulation films causes them to thermally fuse together, forming a sealed internal cavity to encapsulate the electrode components. Because the shape of the encapsulation films is easily altered, to meet energy demands, the gap between the casing and the electrode components is usually minimized, reducing the size of the casing. This can lead to expansion and deformation of the battery during operation, which can compress the casing, causing deformation or even rupture, thus reducing the reliability of the individual battery cell.

[0099] Based on the above-mentioned technical problems, this application provides a technical solution, which provides a first protrusion and a first concave portion at corresponding positions. When the battery cell expands during operation, the expansion force will cause the first main body to deform outward, thereby pulling the first protrusion and the first concave portion, changing the shape of the first protrusion, thereby dispersing the expansion force, reducing the possibility of damage to the first main body portion, and improving the reliability of the battery cell.

[0100] The technical solutions described in this application are applicable to batteries and electrical devices that use batteries. Electrical devices include, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0101] The battery cells described in this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0102] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0103] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 can be installed inside vehicle 1000, specifically, for example, at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200, for example, controls the battery's power supply to the motor 300. The battery can be used for starting and navigation of vehicle 1000. Of course, the battery device 100 can also be used to drive vehicle 1000, replacing or partially replacing gasoline or natural gas as the driving force for vehicle 1000.

[0104] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application. Figure 2 As shown, the battery device 100 includes a housing 400 and battery cells (not shown in the figure), with the battery cells housed within the housing 400.

[0105] The housing 400 is used to house individual battery cells, and the housing 400 can have various structures. In some embodiments, the housing 400 may include a first housing portion 410 and a second housing portion 420, which overlap each other, and together define a receiving portion 430 for housing the individual battery cells. The second housing portion 420 may be a hollow structure with one end open, and the first housing portion 410 may be a plate-like structure, with the first housing portion 410 covering the open side of the second housing portion 420 to form a housing with the receiving portion 430; alternatively, both the first housing portion 410 and the second housing portion 420 may be hollow structures with one side open, with the open side of the first housing portion 410 covering the open side of the second housing portion 420 to form a housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as cylinders, cuboids, etc.

[0106] In the battery device 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells is housed within the housing 400. Alternatively, multiple battery cells can first be connected in series, in parallel, or in a mixed configuration to form a battery module 500, and then the multiple battery modules 500 can be connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 400.

[0107] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application.

[0108] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 110, which are first connected in series, parallel, or in a mixed manner to form a battery module 500. The multiple battery modules 500 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0109] Figure 4 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application. Figure 5 This is a top view structural diagram of a battery cell provided in an embodiment of this application. Figure 6 yes Figure 5 A schematic diagram of the cross-sectional structure of AA. Figure 7 yes Figure 6 A magnified schematic diagram of the Q-axis.

[0110] Please see Figures 4 to 7This application provides a battery cell 110. The battery cell 110 includes an electrode assembly 10 and a housing 20. The housing 20 includes a first encapsulation film 21 and a second encapsulation film 22 disposed opposite to each other along the thickness direction Z of the battery cell 110. The first encapsulation film 21 includes a first main body portion 211 and a first connecting portion 212 disposed around the first main body portion 211. A receiving space is formed between the first main body portion 211 and the second encapsulation film 22. The electrode assembly 10 is disposed in the receiving space. The first connecting portion 212 is connected to the second encapsulation film 22 and forms a sealing area. The sealing area is disposed along the outer periphery of the receiving space. The first connecting portion 212 includes a first protrusion 2121. At least a portion of the first protrusion 2121 is disposed between the receiving space and the sealing area. The first protrusion 2121 protrudes in a direction away from the second encapsulation film 22. The first connecting portion 212 has a first recess 2122 on the side facing the second encapsulation film 22. The first recess 2122 corresponds to the position of the first protrusion 2121.

[0111] In some embodiments, the battery cell 110 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0112] The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. The separator separates the positive and negative electrode. The positive electrode has a positive tab 12 at its end, which is the portion of the positive electrode without an active material layer. The negative electrode has a negative tab 12 at its end, which is the portion of the negative electrode without an active material layer. The positive and negative electrode are stacked, and the portions of the positive and negative electrode coated with the active material layer are stacked to form the main body 11.

[0113] The outer casing 20 includes a first encapsulation film 21 and a second encapsulation film 22, and the electrode assembly 10 is disposed between the first encapsulation film 21 and the second encapsulation film 22.

[0114] The first encapsulation film 21 and the second encapsulation film 22 can be set separately or as a single unit. For example, the first encapsulation film 21 and the second encapsulation film 22 are formed by folding a single encapsulation film (such as aluminum-plastic film, steel-plastic film, etc.) in half.

[0115] Both the first encapsulation film 21 and the second encapsulation film 22 have a multilayer structure. For example, both the first encapsulation film 21 and the second encapsulation film 22 include a protective layer, a metal layer, and a heat-sealing layer, with the protective layer and the heat-sealing layer respectively disposed on both sides of the metal layer. Specifically, the heat-sealing layer can be disposed on the surface of the metal layer facing the electrode assembly 10 using an adhesive, and the protective layer can be disposed on the surface of the metal layer away from the electrode assembly 10 using an adhesive.

[0116] Optionally, the protective layer can be made of nylon or polyethylene terephthalate, the metal layer can be made of aluminum foil or steel foil, and the heat-sealing layer can be made of polypropylene.

[0117] The first encapsulation film 21 and the second encapsulation film 22 are connected on the outside of the electrode assembly 10 to form a sealing area. For example, by hot pressing, the heat-sealing layer of the first encapsulation film 21 is fused to the heat-sealing layer of the second encapsulation film 22 to form a sealing area.

[0118] In some embodiments, the first encapsulation film 21 includes a first main body portion 211 and a first connecting portion 212. A portion of the first main body portion 211 is recessed in a direction away from the second encapsulation film 22 to form at least a portion of the receiving space. A portion of the first main body portion 211 forms the bottom wall of the receiving space, and another portion of the main body portion 211 forms the side wall of the receiving space. Optionally, the first connecting portion 212 is connected to the side wall of the first main body portion 211.

[0119] In some embodiments, the second encapsulation film 22 may be plate-shaped, or a portion of the second encapsulation film 22 may form the top wall of the receiving space, and another portion of the second encapsulation film 22 may form a side wall, with the side wall formed by the second encapsulation film 22 and the side wall formed by the first main body portion 211 together forming the side wall of the receiving space. In other embodiments, the first main body portion 211 may also be plate-shaped.

[0120] The first connecting portion 212 and the second encapsulation film 22 can be connected by means of heat fusion or other methods. The first connecting portion 212 and the second encapsulation film 22 can be directly connected to form a sealed area. The battery cell 110 also includes an electrode terminal 30, with an insulating member 40 provided around its outer periphery. At the location of the electrode terminal 30, the first connecting portion 212 and the second encapsulation film 22 are respectively connected to the insulating member 40 to form a sealed area. The sealed area is located on the outer periphery of the receiving space and can be annular, surrounding the receiving space.

[0121] In some embodiments, the entire first protrusion 2121 is located between the receiving space and the sealing region. Alternatively, a portion of the first protrusion 2121 is located between the receiving space and the sealing region, and another portion of the first protrusion 2121 forms a sidewall of the receiving space. Alternatively, a portion of the first protrusion 2121 is located between the receiving space and the sealing region, and another portion of the first protrusion 2121 is located in the sealing region.

[0122] In some embodiments, the surface of the first protrusion 2121 facing away from the second encapsulation film 22 does not extend beyond the surface of the first body portion 211 facing away from the second encapsulation film 22 in a direction away from the second encapsulation film 22.

[0123] In some embodiments, the first recess 2122 is formed by the side of the first connecting portion 212 facing the second encapsulation film 22 in a direction away from the second encapsulation film 22.

[0124] The first recess 2122 corresponds to the first protrusion 2121. This can be understood as the projections of the first recess 2122 along the thickness direction Z and the first protrusion 2121 along the thickness direction Z at least partially overlap. Optionally, the first connecting portion 212 is a plate-like structure, and the first connecting portion 212 is formed by processes such as bending and stamping to create the first protrusion 2121 and the first recess 2122. It can be understood that the first protrusion 2121 and the first recess 2122 are correspondingly arranged, and the first recess 2122 is also arranged at the same location as the first protrusion 2121.

[0125] In some embodiments, the number of first protrusions 2121 may include one or more.

[0126] In some embodiments, the number of first protrusions 2121 corresponds one-to-one with the number of first recesses 2122.

[0127] In some embodiments, the profile shape of the cross-section of the first protrusion 2121 is the same as the profile shape of the cross-section of the first recess 2122. For example, the profile shape of the cross-section of the first protrusion 2121 is trapezoidal, and the profile shape of the cross-section of the first recess 2122 is trapezoidal. Here, "cross-section" refers to a plane perpendicular to the extending direction of the first protrusion 2121. Of course, they can also be different.

[0128] Optionally, the distance between the outer surface of the first protrusion 2121 and the inner surface of the first recess 2122 can be the thickness of the first connecting portion 212. Alternatively, the distance between the outer surface of the first protrusion 2121 and the inner surface of the first recess 2122 can be less than the thickness of other areas of the first connecting portion 212. Alternatively, the distance between the outer surface of the first protrusion 2121 and the inner surface of the first recess 2122 can be less than the thickness of the first main body portion 211.

[0129] In the technical solution of this application embodiment, by setting a first protrusion 2121 and a first recess 2122 at corresponding positions, the expansion force when the battery cell 110 expands during operation will cause the first main body 211 to deform outward, thereby pulling the first protrusion 2121 and the first recess 2122, causing the shape of the first protrusion 2121 to change, thereby dispersing the expansion force, reducing the possibility of damage to the first main body 211, and improving the reliability of the battery cell 110.

[0130] Figure 8 This is a top view structural diagram of another battery cell provided in the embodiments of this application.

[0131] In some alternative embodiments, please refer to Figure 5 and Figure 8 The first connecting part 212 includes two first protrusions 2121, which are respectively disposed on two opposite sides of the accommodating space along the first direction X, and the first direction X intersects the thickness direction Z.

[0132] Optionally, the first direction X can be the length direction of the battery cell 110, or the width direction of the battery cell 110. The length direction, width direction, and thickness direction Z intersect each other. Optionally, the length direction, width direction, and thickness direction Z are perpendicular to each other.

[0133] Optionally, when the first direction X is the length direction of the battery cell 110, the two first protrusions 2121 are respectively disposed on opposite sides of the accommodating space along the length direction. When the first direction X is the width direction of the battery cell 110, the two first protrusions 2121 are respectively disposed on opposite sides of the accommodating space along the width direction.

[0134] Optionally, the two first protrusions 2121 may have the same shape or different shapes.

[0135] Optionally, the first connecting portion 212 further includes two first recesses 2122, which correspond to the positions of the two first protrusions 2121 respectively.

[0136] In these alternative embodiments, through the above-described configuration, the expansion force of the battery cell 110 during operation will cause the first main body 211 to deform outward, thereby pulling the two first protrusions 2121 and dispersing the expansion force to opposite sides. This reduces the possibility of excessive local stress causing deformation or even breakage of the outer casing 20, improves the uniformity of stress received by the outer casing 20, and enhances the reliability of the battery cell 110.

[0137] Figure 9 This is a top view structural diagram of another battery cell provided in the embodiments of this application.

[0138] In some alternative embodiments, please refer to Figure 9 The first connecting portion 212 includes a plurality of first protrusions 2121, which are disposed on the periphery of the receiving space, and at least some of the first protrusions 2121 are connected to the corresponding first recesses 2122.

[0139] Optionally, the receiving space includes two first sides opposite each other along the length direction and two second sides opposite each other along the width direction, and the plurality of first protrusions 2121 may all be located on one of the first sides of the receiving space. Alternatively, the plurality of first protrusions 2121 may be disposed on the two first sides of the receiving space. Alternatively, the plurality of first protrusions 2121 may all be located on one of the second sides of the receiving space. Alternatively, the plurality of first protrusions 2121 may be disposed on the two second sides of the receiving space. Alternatively, the plurality of first protrusions 2121 may be disposed on the first side and the second side of the receiving space.

[0140] In some embodiments, a plurality of first protrusions 2121 are connected to a plurality of corresponding first recesses 2122. In other embodiments, a portion of the first protrusions 2121 are connected to corresponding first recesses 2122. Here, "first recesses 2122 are connected" means that the ends of two first recesses 2122 are connected together.

[0141] For example, the first connecting portion 212 includes four first protrusions 2121, which are respectively disposed on two first sides and two second sides of the receiving space, and the four first recesses 2122 corresponding to the four first protrusions 2121 can all be interconnected. Alternatively, two or three of the four first protrusions 2121 can be interconnected.

[0142] In these alternative embodiments, the above-described configuration allows the stress acting on the first encapsulation film 21 to be dispersed among the multiple first recesses 2122, thereby reducing the possibility of local stress concentration, enhancing the structural stability of the first encapsulation film 21, and improving the reliability of the battery cell 110.

[0143] In some alternative embodiments, please refer to Figure 7 The first connecting portion 212 also includes a first transition portion 2123. The first protrusion 2121 is connected to the first main body portion 211 through the first transition portion 2123. A gap is provided between the first transition portion 2123 and the second encapsulation film 22.

[0144] Optionally, the first transition portion 2123 is connected to the portion of the first main body portion 211 used to form a sidewall.

[0145] Optionally, the distance between the first transition portion 2123 and the second encapsulation film 22 is less than the distance between the second encapsulation film 22 and the first protrusion 2121.

[0146] Optionally, the first transition portion 2123 may be annular. For example, the first transition portion 2123 may have a continuous annular structure.

[0147] Optionally, the thickness of the first transition portion 2123 may be greater than the distance between the first protrusion 2121 and the first recess 2122.

[0148] Optionally, the thickness of the first transition portion 2123 can be the same as the thickness of the first main body portion 211, or it can be different.

[0149] When there is a first space between the first recess 2122 and the second encapsulation film 22, the gap between the first transition portion 2123 and the second encapsulation film 22 can connect the accommodating space and the first space. Optionally, electrolyte can be provided in the first space. When the first protrusion 2121 is pulled by the expansion force of the battery cell 110, the electrolyte in the first space can flow into the accommodating space to replenish the electrolyte in the accommodating space. When the battery cell 110 recovers after expansion, if the outer shell 20 undergoes elastic deformation, the size of the accommodating space becomes smaller, and the excess electrolyte in the accommodating space can flow into the first space so that the first space stores a portion of the electrolyte.

[0150] In these alternative embodiments, by setting a gap, the possibility of interference between the first transition portion 2123 and the second encapsulation film 22 is reduced, thereby reducing the manufacturing precision of the first encapsulation film 21. At the same time, the expansion force when the battery cell 110 expands and deforms is more likely to pull the first protrusion 2121, thereby reducing the possibility of the expansion force pulling the periphery of other accommodating spaces where the first protrusion 2121 is not provided, thereby reducing the possibility of damage to the casing 20 and improving the reliability of the battery cell 110.

[0151] In some alternative embodiments, please refer to Figure 7 The battery cell 110 also includes an electrode terminal 30, a portion of which is located between the first connection portion 212 and the second encapsulation film 22, and connected to the first connection portion 212 and the second encapsulation film 22. The electrode assembly 10 includes a main body portion 11 and a tab 12, the tab protruding from one edge of the main body portion 11 along a first direction X, one end of the electrode terminal 30 being electrically connected to the tab 12, and the other end of the electrode terminal 30 being located on the outside of the housing 20. At least a portion of the projection of the first protrusion 2121 along the thickness direction Z overlaps with the projection of the tab 12 along the thickness direction Z.

[0152] The electrode terminal 30 is used to electrically connect the battery cell 110 to an external electrical device. The electrode terminal 30 may include a positive electrode terminal 30 and a negative electrode terminal 30. The positive electrode terminal 30 is electrically connected to the positive tab 12, and the negative electrode terminal 30 is electrically connected to the negative tab 12.

[0153] As a conductive structure, the electrode terminal 30 requires insulation between itself and the housing 20. An insulating member 40 is provided in the area of ​​the electrode terminal 30 located between the first connection portion 212 and the second encapsulation film 22 to provide insulation. The insulating member 40 covers the outer surface of the electrode terminal 30. Optionally, the insulating member 40 can be insulating adhesive.

[0154] The electrode terminal 30 is located in the area between the first connecting portion 212 and the second encapsulation film 22. The electrode terminal 30 is connected to the first connecting portion 212 and the second encapsulation film 22, so that the sealing area passes through the overlapping portion of the electrode terminal 30, the first connecting portion 212 and the second encapsulation film 22.

[0155] The tab 12 extends from one side edge of the main body 11 along the first direction X. The electrode terminal 30 is electrically connected to the tab 12 through one end located between the first connecting part 212 and the second encapsulation film 22. The other end of the electrode terminal 30 is located on the outside of the housing 20 so that an external electrical device can be electrically connected to the end located on the outside of the housing 20.

[0156] In some embodiments, a portion of the projection of the first protrusion 2121 along the thickness direction Z overlaps with the projection of the tab 12 along the thickness direction Z, or the projection of the first protrusion 2121 along the thickness direction Z overlaps with the projection of the tab 12 along the thickness direction Z, or the projection of the first protrusion 2121 along the thickness direction Z is located within the projection of the tab 12 along the thickness direction Z.

[0157] In these alternative embodiments, the above-described arrangement helps to increase the arrangement area of ​​the first protrusion 2121, improve the arrangement flexibility of the first protrusion 2121, reduce the expansion force pulling the connection area between the electrode terminal 30 and the housing 20 when the battery cell 110 expands and deforms, thereby reducing the possibility of separation between the electrode terminal 30 and the housing 20 and improving the reliability of the battery cell 110.

[0158] Figure 10 yes Figure 4 A magnified schematic diagram of P.

[0159] In some alternative embodiments, please refer to Figure 4 , Figure 7 and Figure 10The first protrusion 2121 includes a first part 2121a and a second part 2121b connected along the second direction Y. The projection of the first part 2121a along the thickness direction Z overlaps with the projection of the tab 12 along the thickness direction Z. The projection of the second part 2121b along the thickness direction Z is spaced apart from the projection of the tab 12 along the thickness direction Z. The side of the second part 2121b away from the second encapsulation film 22 does not exceed the side of the first part 2121a away from the second encapsulation film 22. The first direction X, the second direction Y and the thickness direction Z intersect each other.

[0160] Optionally, the first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other.

[0161] Optionally, the tab 12 and the first protrusion 2121 are located on the same side of the main body 11, and the first protrusion 2121 extends along the second direction Y, with its extension path passing through the tab 12, so that the first protrusion 2121 includes a first portion 2121a and a second portion 2121b. The first portion 2121a may be located on the side of the tab 12 facing away from the second encapsulation film 22, and the second portion 2121b is disposed opposite to the second encapsulation film 22. There is no second tab 12 between the second portion 2121b and the second encapsulation film 22.

[0162] The side of the second part 2121b away from the second encapsulation film 22 does not exceed the side of the first part 2121a away from the second encapsulation film 22. This can be understood as the surface of the second part 2121b facing away from the second encapsulation film 22 being located between the surface of the first part 2121a facing away from the second encapsulation film 22 and the plane containing the second encapsulation film 22. Alternatively, the surface of the second part 2121b facing away from the second encapsulation film 22 is flush with the surface of the first part 2121a facing away from the second encapsulation film 22.

[0163] In these alternative embodiments, the first portion 2121a and the second portion 2121b can be designed differently or uniformly according to design requirements, thereby improving the design flexibility of the first protrusion 2121 and thus increasing the applicability of the battery cell 110.

[0164] Figure 11 yes Figure 8 A schematic diagram of a cross-sectional structure of BB. Figure 12 yes Figure 11 A magnified schematic diagram of the structure of S in the middle. Figure 13 yes Figure 8 Another cross-sectional structural diagram of BB. Figure 14 yes Figure 13 A magnified schematic diagram of the T-shaped structure.

[0165] In some alternative embodiments, please refer to Figures 11 to 14The second encapsulation film 22 includes a second protrusion 2221 and a second recess 2222. At least a portion of the second protrusion 2221 is disposed between the receiving space and the sealing area, and the second recess 2222 corresponds to the position of the second protrusion 2221.

[0166] In some embodiments, the entire second protrusion 2221 is located between the receiving space and the sealing region. Alternatively, a portion of the second protrusion 2221 is located between the receiving space and the sealing region, and another portion of the second protrusion 2221 forms a sidewall of the receiving space. Alternatively, a portion of the second protrusion 2221 is located between the receiving space and the sealing region, and another portion of the second protrusion 2221 is located in the sealing region.

[0167] The second recess 2222 corresponds to the second protrusion 2221. This can be understood as the projection of the second recess 2222 along the thickness direction Z and the projection of the second protrusion 2221 along the thickness direction Z at least partially overlap. Optionally, the second encapsulation film 22 has a plate-like structure, and the second protrusion 2221 and the second recess 2222 are formed by processes such as bending and stamping. It can be understood that the second protrusion 2221 and the second recess 2222 are correspondingly arranged, and the second recess 2222 is also arranged at the same position as the second protrusion 2221.

[0168] In some embodiments, the number of second protrusions 2221 may include one or more.

[0169] In some embodiments, the number of second protrusions 2221 corresponds one-to-one with the number of second recesses 2222.

[0170] In some embodiments, the profile shape of the cross-section of the second protrusion 2221 is the same as the profile shape of the cross-section of the second recess 2222. For example, the profile shape of the cross-section of the second protrusion 2221 is trapezoidal, and the profile shape of the cross-section of the second recess 2222 is trapezoidal. Here, "cross-section" refers to a plane perpendicular to the extending direction of the second protrusion 2221. Of course, they can also be different.

[0171] Optionally, the multiple second protrusions 2221 can be disposed on different sides of the receiving space. The arrangement of the second protrusions 2221 can be the same as the arrangement of the first protrusions 2121, or it can be different.

[0172] In these alternative embodiments, by setting the second protrusion 2221 and the second recess 2222 at corresponding positions, the expansion force when the battery cell 110 expands during operation will cause the second encapsulation film 22 to deform outward, thereby pulling the second protrusion 2221 and the second recess 2222, causing the shape of the second protrusion 2221 to change, thereby dispersing the expansion force, reducing the possibility of damage to the second encapsulation film 22, and improving the reliability of the battery cell 110.

[0173] In some alternative embodiments, please refer to Figure 11 and Figure 12 The second protrusion 2221 protrudes in a direction away from the first encapsulation film 21, and the second encapsulation film 22 has a second recess 2222 on the side facing the first encapsulation film 21.

[0174] Optionally, when the first recess 2122 and the second recess 2222 are arranged opposite to each other, the first recess 2122 and the second recess 2222 together enclose a large first space, thereby increasing the capacity of the first space to store electrolyte. When the first recess 2122 and the second recess 2222 are not arranged opposite to each other, the first space formed between the first recess 2122 and the second encapsulation film 22 and the first space formed between the second recess 2222 and the first encapsulation film 21 can be independent of each other, or they can be interconnected.

[0175] In these alternative embodiments, the above-described configuration simplifies the fabrication of the second protrusion 2221, allowing the first encapsulation film 21 and the second encapsulation film 22 to be fabricated using the same fabrication tooling, thereby reducing fabrication costs.

[0176] In some alternative embodiments, please refer to Figure 13 and Figure 14 The second protrusion 2221 is provided to protrude in the direction toward the first encapsulation film 21, and at least a portion of the second protrusion 2221 is located in the first recess 2122. The second encapsulation film 22 has a second recess 2222 on the side opposite to the first encapsulation film 21.

[0177] For example, the second protrusion 2221 protrudes in a direction toward the first recess 2122, and a portion or all of the second protrusion 2221 is located within the first recess 2122; in other words, both the first protrusion 2121 and the second protrusion 2221 protrude in the same direction. Optionally, the shape of the second protrusion 2221 is the same as the shape of the first recess 2122.

[0178] Optionally, there may be a gap between the second protrusion 2221 and the first recess 2122, or the second protrusion 2221 and the first recess 2122 may be fitted together.

[0179] In these alternative embodiments, the above-described configuration reduces the space occupied by the first protrusion 2121 and the second protrusion 2221 in the thickness direction Z, thereby reducing the possibility of interference between the first protrusion 2121 and the second protrusion 2221 and other devices, and reducing the overall size of the battery cell 110.

[0180] In some alternative embodiments, please refer to Figures 11 to 14The projections of the first protrusion 2121 along the thickness direction Z and the projections of the second protrusion 2221 along the thickness direction Z are at least partially overlapped.

[0181] In some embodiments, the projections of the first protrusion 2121 along the thickness direction Z and the second protrusion 2221 along the thickness direction Z overlap. In other embodiments, the projections of the first protrusion 2121 along the thickness direction Z and the second protrusion 2221 along the thickness direction Z partially overlap.

[0182] In these alternative embodiments, the above-described configuration helps to improve the stress uniformity of the first encapsulation film 21 and the second encapsulation film 22, reduces the possibility of the first encapsulation film 21 and the second encapsulation film 22 separating due to the different stress dispersion directions, and improves the reliability of the battery cell 110.

[0183] Figure 15 yes Figure 8 Another cross-sectional structural diagram of BB. Figure 16 yes Figure 15 A magnified schematic diagram of the V-shaped structure.

[0184] In some alternative embodiments, please refer to Figure 15 and Figure 16 The projections of the first protrusion 2121 along the thickness direction Z and the second protrusion 2221 along the thickness direction Z are spaced apart.

[0185] In some embodiments, the first protrusion 2121 and the second protrusion 2221 are located on the same side of the receiving space, and the projection of the first protrusion 2121 along the thickness direction Z is located between the projection of the receiving space along the thickness direction Z and the projection of the second protrusion 2221 along the thickness direction Z. Alternatively, the projection of the second protrusion 2221 along the thickness direction Z is located between the projection of the receiving space along the thickness direction Z and the projection of the first protrusion 2121 along the thickness direction Z.

[0186] In some embodiments, the first protrusion 2121 and the second protrusion 2221 are located on different sides of the receiving space. For example, the first protrusion 2121 is located on the first side of the receiving space, and the second protrusion 2221 is located on the second side of the receiving space.

[0187] In these alternative embodiments, the above-described arrangement improves the flexibility of the arrangement of the first protrusion 2121 and the second protrusion 2221, allowing the first protrusion 2121 and the second protrusion 2221 to be specifically designed to improve the anti-expansion performance of the casing 20, thereby improving the reliability of the battery cell 110.

[0188] In some alternative embodiments, please refer to Figure 11 and Figure 16 The second encapsulation film 22 includes a second main body portion 221 and a second connecting portion 222 disposed around the second main body portion. A receiving space is formed between the first main body portion 211 and the second main body portion 221. The first connecting portion 212 and the second connecting portion 222 are connected to form a sealing area. The second connecting portion 222 includes a second protrusion 2221 and a second recess 2222.

[0189] In some embodiments, the surface of the second protrusion 2221 facing away from the first encapsulation film 21 does not extend beyond the surface of the second body portion 221 facing away from the first encapsulation film 21 in a direction away from the first encapsulation film 21.

[0190] In some embodiments, the second recess 2222 is formed by the side of the second connection portion 222 facing the first encapsulation film 21 in a direction away from the first connection portion 212.

[0191] In some embodiments, the second recess 2222 is formed by the second connection portion 222 being recessed on the side of the second connection portion 222 facing away from the first encapsulation film 21 in a direction toward the first connection portion 212.

[0192] Optionally, the distance between the outer surface of the second protrusion 2221 and the inner surface of the second recess 2222 can be the thickness of the second connecting portion 222. Alternatively, the distance between the outer surface of the second protrusion 2221 and the inner surface of the second recess 2222 can be less than the thickness of other areas of the second connecting portion 222. Alternatively, the distance between the outer surface of the second protrusion 2221 and the inner surface of the second recess 2222 can be less than the thickness of the second main body portion 221.

[0193] In some embodiments, the second connecting portion 222 further includes a second transition portion 2223, the second protrusion 2221 is connected to the second main body portion 221 through the second transition portion 2223, and a gap is provided between the second transition portion 2223 and the first encapsulation film 21.

[0194] Optionally, the second transition portion 2223 and the first transition portion 2123 are disposed opposite each other along the thickness direction Z, and a gap is provided between the second transition portion 2223 and the first transition portion 2123.

[0195] Optionally, the distance between the second transition portion 2223 and the first encapsulation film 21 is less than the distance between the first encapsulation film 21 and the second protrusion 2221.

[0196] Optionally, the second transition portion 2223 may be annular. For example, the second transition portion 2223 may have a continuous annular structure.

[0197] Optionally, the thickness of the second transition portion 2223 may be greater than the distance between the second protrusion 2221 and the second recess 2222.

[0198] Optionally, the thickness of the second transition portion 2223 can be the same as the thickness of the second main body portion 221, or it can be different.

[0199] Optionally, a portion of the electrode terminal 30 is located between the first connecting portion 212 and the second connecting portion 222, and the first connecting portion 212 and the second connecting portion 222 are respectively connected to the insulating member 40 covering the outer periphery of the electrode terminal 30.

[0200] In these alternative embodiments, by providing the second main body 221, it is beneficial to increase the accommodating space and improve the range of the battery cell 110; by providing the second connecting part 222, the first connecting part 212 and the second connecting part 222 can share the same manufacturing tooling, thereby reducing manufacturing costs and improving production efficiency.

[0201] In some alternative embodiments, the cross-sectional shape of the first protrusion 2121 along the direction perpendicular to the extension of the first protrusion includes one or a combination of triangle, quadrilateral, ellipse, and circle.

[0202] Optionally, when the first protrusion 2121 extends along the first direction X, the cross-section of the first protrusion 2121 refers to the cross-section of a plane perpendicular to the first direction X. When the first protrusion 2121 extends along the second direction Y, the cross-section of the first protrusion 2121 refers to the cross-section of a plane perpendicular to the second direction Y.

[0203] Optionally, the cross-sectional shape of the second protrusion 2221 along the direction perpendicular to the extension of the second protrusion includes one or a combination of triangle, quadrilateral, ellipse, and circle.

[0204] In these alternative embodiments, it is advantageous to improve the arrangement flexibility of the first protrusion 2121, which can be adjusted according to design requirements, and it is advantageous to control the stretching direction and stretching amount of the first encapsulation film 21.

[0205] In some alternative embodiments, please refer to Figure 16 The thickness of the outer shell 20 is D, 0.08mm≤D≤0.2mm.

[0206] In some embodiments, the thickness of the outer casing 20 is 0.08 mm, 0.09 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, or 0.2 mm.

[0207] Optionally, the thickness of the outer shell 20 can be the thickness of the first encapsulation film 21 or the thickness of the second encapsulation film 22.

[0208] In these alternative embodiments, setting the thickness of the housing 20 to be greater than or equal to 0.08 helps to improve the mechanical strength of the housing 20; setting the thickness of the housing to be less than or equal to 0.2 makes the first protrusion 2121 and the second protrusion 2221 easier to stretch, thereby reducing the force exerted by the electrode assembly 10 on the housing 20, reducing the possibility of housing cracking, and improving the reliability of the battery cell 110.

[0209] In some alternative embodiments, the dimension of the first protrusion 2121 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the first protrusion 2121.

[0210] It is understood that the dimension of the first protrusion 2121 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the first protrusion 2121, and the dimension of the first recess 2122 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the first protrusion 2121.

[0211] For example, the first protrusion 2121 extends along a first direction X, that is, the dimension of the first protrusion extending along the first direction is greater than or equal to the dimension of the receiving space along the first direction X. The first protrusion 2121 extends along a second direction Y, that is, the dimension of the first protrusion extending along the second direction is greater than or equal to the dimension of the receiving space along the second direction Y.

[0212] Optionally, the dimension of the second protrusion 2221 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the second protrusion 2221.

[0213] It is understood that the dimension of the second protrusion 2221 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the second protrusion 2221, and the dimension of the second recess 2222 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the second protrusion 2221.

[0214] In these alternative embodiments, increasing the stress on the first protrusion 2121 further disperses the stress on the first main body 211, making the first protrusion 2121 easier to stretch. Furthermore, the stretching deformation of the first protrusion 2121 can be increased, thereby increasing the overall size of the space after stretching, improving the resistance to expansion deformation of the battery cell 110, and improving the reliability of the battery cell 110.

[0215] In some alternative embodiments, please refer to Figure 12The first protrusion 2121 has an outer edge length L along its cross-section perpendicular to its extension direction, and the battery cell 110 has a capacity C. 2mm≤L≤6mm, 0.5Ah≤C≤30Ah; or, 5mm≤L≤10mm, 30Ah≤C≤100Ah; or, 5mm≤L≤15mm, 100Ah≤C≤300Ah.

[0216] In some embodiments, the capacity of the battery cell 110 is less than or equal to 30Ah, and the outer edge length of the first protrusion 2121 along its cross-section perpendicular to its extension direction is less than or equal to 6mm, thereby reducing redundant configuration of the first protrusion 2121, reducing material waste, and lowering manufacturing costs. Here, "the outer edge length of the first protrusion 2121 along its cross-section perpendicular to its extension direction" refers to a quadrilateral shape, where three sides of the quadrilateral are the outer edge of the first protrusion 2121, and the other side is the maximum boundary of the first protrusion 2121 along its width direction. The outer edge length is the sum of the lengths of the three sides of the quadrilateral. For example, if the cross-section of the first protrusion 2121 along its extension direction is trapezoidal, with the upper base of the trapezoid located on the side of the first protrusion 2121 away from the second encapsulation film 22, the outer edge length is the sum of the length L1 of the upper base and the lengths L2 of the two side edges of the trapezoid, i.e., L1 + 2L2 = L.

[0217] In some embodiments, the capacity of the battery cell 110 is greater than or equal to 0.5Ah, and the outer edge length of the cross-section of the first protrusion 2121 along its own width direction is less than or equal to 2mm, which is beneficial to increasing the stretchability of the first protrusion 2121 and increasing the deformable space of the accommodating space.

[0218] In some embodiments, the capacity of the battery cell 110 is less than or equal to 100Ah, and the outer edge length of the first protrusion 2121 along the cross-section perpendicular to its own extension direction is less than or equal to 10mm, thereby reducing the redundant setting of the first protrusion 2121, reducing material waste, and lowering manufacturing costs.

[0219] In some embodiments, the capacity of the battery cell 110 is greater than or equal to 30Ah, and the outer edge length of the cross-section of the first protrusion 2121 along its own width direction is less than or equal to 5mm, which is beneficial to increase the stretchability of the first protrusion 2121 and increase the deformable space of the accommodating space.

[0220] In some embodiments, the capacity of the battery cell 110 is less than or equal to 300Ah, and the outer edge length of the first protrusion 2121 along the cross-section perpendicular to its own extension direction is less than or equal to 15mm, thereby reducing the redundant setting of the first protrusion 2121, reducing material waste, and lowering manufacturing costs.

[0221] In some embodiments, the capacity of the battery cell 110 is greater than or equal to 100Ah, and the outer edge length of the cross-section of the first protrusion 2121 along its width direction is less than or equal to 5mm, which is beneficial to increasing the stretchability of the first protrusion 2121 and increasing the deformable space of the accommodating space. Optionally, 10mm≤L≤15mm, 100Ah≤C≤300Ah.

[0222] In some embodiments, the relationship between the outer edge length of the cross section of the second protrusion 2221 perpendicular to its own extension direction and the capacity of the battery cell 110 is the same as the relationship between the outer edge length of the cross section of the first protrusion 2121 perpendicular to its own extension direction and the capacity of the battery cell 110.

[0223] It is understandable that when the outer edge length of the first protrusion 2121 along the cross section perpendicular to its own extension direction is adjusted, the outer edge length of the first concave portion 2122 along the cross section perpendicular to its own extension direction increases according to the increase in the size of the first protrusion 2121.

[0224] In these alternative embodiments, the above-described configuration allows for reduced redundancy in the first protrusion 2121, increased stretchability of the first protrusion, reduced manufacturing costs, and improved reliability of the battery cell 110.

[0225] In some embodiments, the electrode assembly includes a positive electrode, an electrolyte, and a negative electrode. The negative electrode includes a negative current collector and an active material layer disposed on at least one side of the negative current collector. The active material layer includes an elemental active metal.

[0226] In some embodiments of this application, the negative electrode includes a negative current collector and an active material layer disposed on at least one side of the negative current collector. The active material layer includes an elemental active metal. It is understood that an active metal refers to a metal capable of providing active metal ions. For example, if the elemental active metal of a battery cell is lithium, or if the elemental active metal of a battery cell is sodium, then the battery cell includes an alkali metal battery. Specifically, a battery cell refers to a battery that uses an active metal as the negative electrode, such as lithium metal or sodium metal. This reduces the internal resistance of the battery cell, improves its conductivity, and enhances its overall performance.

[0227] In some embodiments, the active metal comprises at least one of lithium, sodium, potassium, zinc, or aluminum. That is, the battery cell comprises at least one of lithium metal, sodium metal, potassium metal, zinc metal, or aluminum metal. This expands the range of materials that can be selected for the battery cell and broadens its applicability.

[0228] In some embodiments, the electrolyte includes a solvent, which includes at least one of ether solvents or ester solvents. It is understood that ether solvents refer to organic solvents containing ether groups, and ester solvents refer to organic solvents containing ester groups. This expands the range of materials that can be selected for battery cells and broadens their applicability.

[0229] In some embodiments, the solvent includes ether solvents, which include at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane. The above-mentioned ether solvents are compatible with various battery cells, and in particular, are compatible with battery cells, thus improving the applicability of battery cells.

[0230] In some embodiments of this application, the ester solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, or diethyl sulfone.

[0231] Secondly, embodiments of this application provide a battery device 100, including the battery cell 110 in any of the foregoing embodiments.

[0232] Thirdly, embodiments of this application provide an electrical device, including the battery device 100 in any of the foregoing embodiments, the battery device being used to provide electrical energy to the electrical device.

[0233] According to some embodiments of this application, please refer to Figures 4 to 8 as well as Figure 11 and Figure 12The battery cell 110 includes an electrode assembly 10 and a housing 20. The housing includes a first encapsulation film 21 and a second encapsulation film 22 disposed opposite to each other along the thickness direction Z of the battery cell 110. The first encapsulation film includes a first main body portion 211 and a first connecting portion 212 disposed around the first main body portion 211. A receiving space is formed between the first main body portion and the second encapsulation film 22. The electrode assembly 10 is disposed in the receiving space. The first connecting portion 212 is connected to the second encapsulation film 22 and forms a sealing area. The sealing area is disposed along the outer periphery of the receiving space. The first connecting portion 212 includes a first protrusion 2121. At least part of the first protrusion is disposed between the receiving space and the sealing area. The first protrusion 2121 protrudes in a direction away from the second encapsulation film 22. The first connecting portion 212 has a first recess 2122 on the side facing the second encapsulation film 22. The first recess corresponds to the position of the first protrusion 2121.

[0234] The first connecting portion 212 includes two first protrusions 2121, which are disposed on opposite sides of the accommodating space along the first direction X, and the first direction intersects the thickness direction Z.

[0235] The first connecting portion 212 also includes a first transition portion 2123. The first protrusion 2121 is connected to the first main body portion 211 through the first transition portion 2123. A gap is provided between the first transition portion and the second encapsulation film 22.

[0236] The battery cell 110 also includes an electrode terminal 30, a portion of which is located between the first connection portion 212 and the second encapsulation film 22, and connected to the first connection portion 212 and the second encapsulation film 22. The electrode assembly 10 includes a main body portion 11 and a tab 12, the tab protruding from one side edge of the main body portion along the first direction X, one end of the electrode terminal 30 being electrically connected to the tab 12, and the other end of the electrode terminal being located on the outside of the housing 20, at least a portion of the projection of the first protrusion 2121 along the thickness direction Z overlapping the projection of the tab 12 along the thickness direction Z.

[0237] The second encapsulation film 22 includes a second protrusion 2221 and a second recess 2222. At least a portion of the second protrusion is disposed between the receiving space and the sealing area, and the second recess 2222 corresponds to the second protrusion 2221. The second protrusion protrudes in a direction away from the first encapsulation film 21, and the second encapsulation film 22 has a second recess 2222 on the side facing the first encapsulation film 21. The projections of the first protrusion 2121 along the thickness direction Z and the projections of the second protrusion 2221 along the thickness direction at least partially overlap.

[0238] The second encapsulation film 22 includes a second main body portion 221 and a second connecting portion 222 disposed around the second main body portion 11. A receiving space is formed between the first main body portion 211 and the second main body portion 221. The first connecting portion 212 and the second connecting portion 222 are connected to form a sealing area. The second connecting portion includes a second protrusion 2221 and a second recess 2222. The dimension of the first protrusion 2121 along its own extending direction is greater than or equal to the dimension of the receiving space along the extending direction of the first protrusion 2121.

[0239] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; The outer casing includes a first encapsulation film and a second encapsulation film disposed opposite to each other along the thickness direction of the battery cell. The first encapsulation film includes a first main body portion and a first connecting portion disposed around the first main body portion. A receiving space is formed between the first main body portion and the second encapsulation film. The electrode assembly is disposed in the receiving space. The first connecting portion is connected to the second encapsulation film and forms a sealing area. The sealing area is disposed along the outer periphery of the receiving space. The first connecting portion includes a first protrusion, at least part of which is disposed between the receiving space and the sealing area. The first protrusion protrudes in a direction away from the second encapsulation film, and the first connecting portion has a first recess on the side facing the second encapsulation film, with the first recess corresponding to the position of the first protrusion.

2. The battery cell of claim 1, wherein, The first connecting portion includes two first protrusions, which are disposed on opposite sides of the accommodating space along a first direction, the first direction intersecting the thickness direction.

3. The battery cell of claim 1, wherein, The first connecting portion includes a plurality of first protrusions, which are disposed on the periphery of the receiving space, and at least a portion of the first protrusions are connected to corresponding first recesses.

4. The battery cell of claim 1, wherein, The first connecting portion further includes a first transition portion, the first protrusion is connected to the first main body portion through the first transition portion, and a gap is provided between the first transition portion and the second encapsulation film.

5. The battery cell of claim 1, wherein, The battery cell further includes an electrode terminal, a portion of which is located between the first connecting portion and the second encapsulation film, and is connected to the first connecting portion and the second encapsulation film; The electrode assembly includes a main body and a tab. The tab protrudes from one side edge of the main body along a first direction. One end of the electrode terminal is electrically connected to the tab, and the other end of the electrode terminal is located on the outside of the housing. At least a portion of the projection of the first protrusion along the thickness direction overlaps with the projection of the tab along the thickness direction.

6. The battery cell of claim 5, wherein, The first protrusion includes a first part and a second part connected along a second direction. The projection of the first part along the thickness direction overlaps with the projection of the tab along the thickness direction. The projection of the second part along the thickness direction is spaced apart from the projection of the tab along the thickness direction. The side of the second part away from the second encapsulation film does not exceed the side of the first part away from the second encapsulation film. The first direction, the second direction, and the thickness direction intersect each other.

7. The battery cell of claim 1, wherein, The second encapsulation film includes a second convex portion and a second concave portion, at least a portion of the second convex portion being disposed between the receiving space and the sealing area, and the second concave portion corresponding to the position of the second convex portion.

8. The battery cell of claim 7, wherein, The second protrusion protrudes in a direction away from the first encapsulation film, and the second encapsulation film has a second recess on the side facing the first encapsulation film.

9. The battery cell of claim 7, wherein, The second protrusion protrudes in the direction toward the first encapsulation film, and at least a portion of the second protrusion is located within the first recess. The second encapsulation film has a second recess on the side opposite to the first encapsulation film.

10. The battery cell according to claim 7, characterized in that, The projections of the first protrusion along the thickness direction and the projections of the second protrusion along the thickness direction are at least partially overlapping.

11. The battery cell according to claim 7, characterized in that, The projections of the first protrusion along the thickness direction and the projections of the second protrusion along the thickness direction are spaced apart.

12. The battery cell of any one of claims 7 to 11, wherein, The second encapsulation film includes a second main body portion and a second connecting portion disposed around the second main body portion. The receiving space is formed between the first main body portion and the second main body portion. The first connecting portion and the second connecting portion are connected to form a sealing area. The second connecting portion includes a second protrusion and a second recess.

13. The battery cell of claim 1, wherein, The cross-sectional shape of the first protrusion along the direction perpendicular to the extension of the first protrusion includes one or a combination of triangle, quadrilateral, ellipse, and circle.

14. The battery cell of claim 1, wherein, The thickness of the outer shell is D, where 0.08mm ≤ D ≤ 0.2mm.

15. The battery cell of claim 1, wherein, The dimension of the first protrusion along its own extension direction is greater than or equal to the dimension of the receiving space along the extension direction of the first protrusion.

16. The battery cell of claim 1, wherein, The first protrusion has an outer edge length of L along its cross-section perpendicular to its extension direction, and the battery cell has a capacity of C, where 2mm≤L≤6mm, 0.5Ah≤C≤30Ah; or, 5mm≤L≤10mm, 30Ah≤C≤100Ah; or, 5mm≤L≤15mm, 100Ah≤C≤300Ah.

17. The battery cell of any one of claims 1-16, wherein, The electrode assembly includes a positive electrode, an electrolyte, and a negative electrode. The negative electrode includes a negative current collector and an active material layer disposed on at least one side of the negative current collector. The active material layer includes an elemental active metal.

18. The battery cell of claim 17, wherein, The active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum.

19. The battery cell of claim 17, wherein, The electrolyte includes a solvent, which includes at least one of an ether solvent or an ester solvent.

20. The battery cell according to claim 19, characterized in that, The solvent includes ether solvents, which include at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxopentane.

21. A battery device, characterized by Includes the battery cell as described in any one of claims 1 to 20.

22. An electrical device, comprising: Includes the battery device as described in claim 21, wherein the battery device is used to provide electrical energy to the electrical device.

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