Battery cell, battery apparatus, and electric apparatus

Abstract

Some embodiments of the present application provide a battery cell, a battery apparatus, and an electric apparatus. A casing of the battery cell comprises first walls, second walls and third walls which are connected to each other, the area of the third walls is greater than the area of the first walls, the area of the third walls is greater than the area of the second walls, and an electrode assembly is accommodated in the casing. An electrode terminal is provided on one first wall and is electrically connected to a tab. An insulating film covers part of the second walls and at least part of the third walls from the outside, a first opening is formed in the insulating film, and the first opening corresponds to one second wall in the thickness direction of the second wall. The insulating film covers part of the second walls and at least part of the third walls from the outside, so that the casing is insulated and isolated from an external device. Since the first opening is formed in the insulating film at a position corresponding to one second wall, the second wall can be directly connected to the external device, so that the battery cell can be more firmly fixed in the battery apparatus by the external device, thereby improving the reliability of the battery apparatus.

Description

Battery cells, battery packs and electrical devices Cross-references to related applications

[0001] This application claims priority to Chinese patent application 202520173656.7, filed on January 26, 2025, entitled “Battery cell, battery device and power consumption device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] 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

[0003] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0004] As battery devices are used more frequently in people's lives, improving their reliability is attracting increasing attention from those skilled in the art. Summary of the Invention

[0005] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, wherein the battery cell can be firmly connected to an external device, thereby being firmly fixed in the battery device, which is beneficial to improving the reliability of the battery device.

[0006] In a first aspect, some embodiments of this application provide a battery cell, which includes an electrode assembly, a housing, electrode terminals, and an insulating film. The electrode assembly includes tabs; the housing includes a first wall, a second wall, and a third wall connected to each other, the area of ​​the third wall being larger than the area of ​​the first wall and the area of ​​the third wall being larger than the area of ​​the second wall, and the electrode assembly is housed in the housing; the electrode terminals are disposed on the first wall and electrically connected to the tabs; the insulating film covers a portion of the second wall and at least a portion of the third wall from the outside, and the insulating film has a first opening, which is opposite to the second wall in the thickness direction of the second wall.

[0007] In the above structure, the insulating film covers a portion of the second wall and at least a portion of the third wall from the outside, achieving insulation isolation between the outer casing and external devices. Since the insulating film opposite the second wall is provided with a first opening, the second wall can be directly connected to the external devices, allowing the outer casing to be directly subjected to force. This enables the battery cell to be more firmly fixed in the battery device by the external devices, which is beneficial to improving the reliability of the battery device.

[0008] According to some embodiments of this application, the battery cell has two first walls, two second walls, and two third walls. The two first walls are arranged opposite each other along a first direction, the two second walls are arranged opposite each other along a second direction, and the two third walls are arranged opposite each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. There are two first openings, and the two first openings are respectively opposite to the two second walls.

[0009] By setting two first openings and positioning them opposite to two second walls, the battery cell's casing can be directly connected to external components through the two opposing walls in the second direction, which helps to improve the robustness of the connection between the battery cell and external devices.

[0010] According to some embodiments of the present application, the shortest distance between the inner wall surface of the first opening and the outer surface of the third wall along the third direction is A, 3mm≤A≤6mm; and the shortest distance between the inner wall surface of the first opening and the outer surface of the first wall along the first direction is B, 3mm≤B≤15mm. This not only allows the insulating film to effectively cover the edge portion of the second wall, ensuring a sufficiently long creepage distance between the portion of the second wall without insulating material and the adjacent battery cell, thus reducing the possibility of short circuits between the portion of the second wall without insulating material and external devices, but also ensures that the first opening has a sufficiently large area, allowing the portion of the second wall without insulating material to be directly connected to external devices, thereby improving the robustness of the connection between the battery cell and external devices.

[0011] According to some embodiments of this application, the insulating film of the battery cell includes a second insulating member and two first insulating members disposed opposite each other along a third direction. The first insulating member includes a first main body region and a first flange region connected to the first main body region. The first main body region is attached to a third wall. The first flange region is bent relative to the first main body region and attached to a second wall. The second insulating member is connected to the first flange regions of the two first insulating members and attached to the second wall. The first insulating member and the first flange region are disposed around the outer periphery of the first opening.

[0012] According to some embodiments of the present application, the second insulating member further includes a second flanged area connected to the first body region, the second flanged area being bent relative to the first body region and attached to the first wall. By bending the second flanged area relative to the first body region, the second flanged area can be attached to the surface of the first wall perpendicular to the third wall.

[0013] According to some embodiments of the present application, the battery cell includes a second main body region, which includes a second primary region and two second sub-regions. The two second sub-regions are connected to the two ends of the second primary region in a third direction. The second primary region is attached to a second wall, and the two second sub-regions are respectively stacked with the first flanged regions of two first insulators. By connecting the two second sub-regions to the two ends of the second primary region in a third direction and stacking the two second sub-regions with the first flanged regions of two first insulators, the two ends of the second primary region in a third direction are respectively connected to the first flanged regions of the two first insulators, thereby enabling a firm connection between the second insulator and the first insulator.

[0014] According to some embodiments of the present application, the battery cell includes a second insulating member further comprising a flanged area connected to the second main body region. The flanged area is bent relative to the second main body region and attached to the first wall and the second flanged area. By bending relative to the second main body region, the flanged area can be attached to the first wall and the second flanged area, which not only increases the connection area between the second insulating member and the outer casing, thus reducing the possibility of the second insulating member falling off, but also reduces the area of ​​the first wall directly exposed, thereby improving the reliability of the battery cell.

[0015] According to some embodiments of the present application, the battery cell includes a flanged main region and two flanged sub-regions. The two flanged sub-regions are connected to both ends of the flanged main region in a third direction. The flanged main region is attached to a first wall, and the two flanged sub-regions are respectively stacked with the second flanged regions of two first insulating members. By providing flanged sub-regions at both ends of the flanged main region in a third direction and stacking the two flanged sub-regions with the second flanged regions of the two first insulating members, the flanged region is respectively connected to the second flanged regions of the two first insulating members at both ends in a third direction. By attaching the flanged main region to the first wall, the flanged region can be more firmly connected to the first wall.

[0016] According to some embodiments of this application, the battery cell has a flanged area and a second flanged area forming a second opening. In the thickness direction of the first wall, the second opening is opposite to the first wall, and the electrode terminal is located in the second opening, so that the electrode terminal disposed on the first wall extends out from the second opening, thereby reducing the possibility that the insulating film may affect the electrical connection between the electrode terminal and external devices.

[0017] According to some embodiments of the present application, the distance between the outer surfaces of the two second walls in the second direction is W, the distance between the outer surfaces of the two first walls in the first direction is L, and the sum of the dimensions of the second main body region in the first direction and the dimensions of the flange region in the second direction is set to E, where A+B≤E≤25%(L+W). This not only enables the second insulating member to extend the creepage distance between the first wall and the adjacent battery cell, but also reduces the possibility of wasting material in the second insulating member.

[0018] According to some embodiments of this application, the battery cell has a rounded corner at the connection between the second and third walls, so that the mutually perpendicular second and third walls can transition smoothly, reducing the possibility of the casing scratching people due to sharp corners.

[0019] According to some embodiments of the present application, the distance between the outer surfaces of the two third walls in the third direction is T, the radius of the rounded corner is R, and the dimension of the second main body area in the third direction is D, where T-2B≤D≤T-2R. This not only makes it difficult for the second main body area to be attached to the first flange area corresponding to the rounded corner, but also makes the second main body area have sufficient dimensions to overlap with the first flange area, so that the second insulating member can be firmly connected to the first insulating member.

[0020] According to some embodiments of this application, the battery cell has an insulating film wrapped around the outer surface of the housing. The insulating film includes a first region, a second region, and a third region arranged along the winding direction. The third region is located outside the first region and is stacked with the first region. The first opening is located in the second region.

[0021] By sequentially winding the first, second, and third zones along the winding direction to cover the surface of the outer shell, the insulating film is formed on the outer shell in a manner that wraps around and covers the surface of the outer shell.

[0022] According to some embodiments of this application, in a battery cell, a third region and a first region are attached to a third wall, such that the first region is attached to the outer surface of the third wall and the third region is attached to the outer surface of the first region, such that the overlapping area of ​​the insulating film is located on the outside of the third wall.

[0023] According to some embodiments of this application, in a battery cell, a third region and a first region are attached to a second wall, such that the first region is attached to the outer surface of the second wall and the third region is attached to the outer surface of the first region, such that the overlapping area of ​​the insulating film is located on the outside of the second wall.

[0024] According to some embodiments of this application, the battery cell has electrode terminals including a first terminal and a second terminal with opposite polarities. The first terminal and the second terminal are spaced apart and located in a second opening, so that the first terminal and the second terminal can extend out of the second opening for connection with an external electrical device or charging device.

[0025] According to some embodiments of this application, a battery cell has a first terminal and a second terminal disposed on one of two first walls, and the other of the two first walls has a pressure relief structure connected to a second opening. This structure allows two electrode terminals of opposite polarity to be disposed on one of the first walls of the battery cell, and the pressure relief structure to be disposed on the other of the two first walls and connected to the second opening, making it less likely that the insulating film will affect the operation of the pressure relief structure.

[0026] Secondly, some embodiments of this application also provide a battery device, which includes a housing assembly, an adhesive structure, and a battery cell provided by any of the above technical solutions. The housing assembly includes a housing, and the battery cell is located in the housing. The second wall opposite to the first opening is bonded to the housing through the adhesive structure, which improves the firmness of the connection between the battery cell and the housing, so that the battery cell can be more firmly fixed in the housing.

[0027] According to some embodiments of the present application, the battery device further includes a heat exchange plate located in and connected to the housing. The second wall opposite the first opening is bonded to the heat exchange plate by an adhesive structure. This not only improves the firmness of the connection between the battery cell and the housing assembly, but also enables the heat of the battery cell to be better transferred to the heat exchange plate, which is beneficial to improving the heat exchange efficiency between the heat exchange plate and the battery cell.

[0028] Thirdly, some embodiments of this application also provide an electrical device, which includes the battery device provided by the above-described technical solution, and the battery device is used to provide electrical energy.

[0029] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0030] Some embodiments of this application provide a battery cell including an electrode assembly, a housing, electrode terminals, and an insulating film. The electrode assembly includes tabs; the housing includes a first wall, a second wall, and a third wall connected to each other, the area of ​​the third wall being larger than the area of ​​the first wall, and the area of ​​the third wall being larger than the area of ​​the second wall. The electrode assembly is housed within the housing; the electrode terminals are disposed on the first wall and electrically connected to the tabs; the insulating film covers a portion of the second wall and at least a portion of the third wall from the outside, and the insulating film has a first opening, which is opposite to the second wall in the thickness direction of the second wall. In the above structure, the insulating film covers a portion of the second wall and at least a portion of the third wall from the outside, achieving insulation isolation between the housing and external devices. Because the insulating film opposite the second wall has a first opening, the second wall can be directly connected to external devices, allowing the housing to directly bear force. This allows the battery cell to be more securely fixed in the battery device by external devices, which is beneficial to improving the reliability of the battery device.

[0031] 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

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0033] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0034] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0035] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0036] Figure 4 is a schematic diagram of the structure of the outer casing in a battery cell provided in some embodiments of this application;

[0037] Figure 5 is a schematic diagram of the structure of the insulating film in a battery cell provided in some embodiments of this application;

[0038] Figure 6 is a schematic diagram of the unfolded structure of the second insulating member in a battery cell provided in some embodiments of this application;

[0039] Figure 7 is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application;

[0040] Figure 8 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0041] Figure 9 is a schematic diagram of the unfolded structure of the insulating film provided in some embodiments of this application;

[0042] Figure 10 is a schematic diagram of the structure of the insulating film after it has been unfolded according to some other embodiments of this application.

[0043] In the attached diagram:

[0044] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Reception space; 7. Battery cell; 9. Outer casing; 91. First wall; 92. Second wall; 93. Third wall; 11. Insulating film; 111. First insulating component;

[0045] 1111, First Main Area; 1112, First Folded Edge Area; 1113, Second Folded Edge Area;

[0046] 112. Second insulating component; 1121. Second main area; 11211. Second main area; 11212. Second sub-area; 1122. Flanged area; 11221. Flanged main area; 11222. Flanged sub-area;

[0047] 113. Zone 1; 114. Zone 2; 115. Zone 3;

[0048] 12. First opening; 13. Second opening; 14. Pressure relief structure;

[0049] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0052] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0056] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0057] In this application, "multiple" means two or more (including two).

[0058] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices 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 aerospace and other fields.

[0059] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0060] 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.

[0061] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0062] 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.

[0063] In some embodiments, the battery cell further 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.

[0064] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0065] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0066] In some embodiments, the solvent may be selected from at least one of 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, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0067] Gel electrolytes consist of a polymer-based electrolyte backbone network combined with an ionic liquid—lithium salt.

[0068] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0069] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0070] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0071] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0072] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0073] In some embodiments, a single battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0074] As an example, the battery cell can be a prismatic battery cell, including a prismatic battery cell, a blade-shaped battery cell, or a multi-prism battery, such as a hexagonal prism battery. In the embodiments of this application, the battery cell is a blade-shaped battery cell.

[0075] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0076] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0077] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0078] 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.

[0079] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0080] 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.

[0081] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0086] Current blade-shaped battery cells typically have electrode terminals on one side or on opposite sides, and the insulating film on the casing is a ring-shaped covering. When connecting the battery cell to external devices, it is usually through this insulating film. Because the casing of the battery cell is not directly connected to the external device due to the insulating film, this not only makes the battery cell less stable under stress but also makes the connection between the battery cell and the external device prone to breakage if the insulating film is damaged.

[0087] To enable a battery cell to be securely connected to an external device, some embodiments of this application provide a battery cell comprising an electrode assembly, a housing, electrode terminals, and an insulating film. The electrode assembly includes tabs; the housing includes a first wall, a second wall, and a third wall interconnected, the third wall having an area larger than the first wall, and the third wall having an area larger than the second wall; the electrode assembly is housed within the housing; the electrode terminals are disposed on the first wall and electrically connected to the tabs; the insulating film covers a portion of the second wall and at least a portion of the third wall from the outside, and the insulating film has a first opening, which is opposite to the second wall in the thickness direction of the second wall. In the above structure, the insulating film covering a portion of the second wall and at least a portion of the third wall from the outside achieves insulation isolation between the housing and the external device. Because the insulating film opposite the second wall has a first opening, the second wall can be directly connected to the external device, allowing the housing to directly bear force, thereby enabling the battery cell to be more securely fixed in the battery device by the external device, which is beneficial to improving the reliability of the battery device.

[0088] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0089] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include 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, etc.

[0090] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0091] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application.

[0092] As shown in Figure 1, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0093] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0094] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0095] Figure 2 is a schematic diagram showing the disassembled structure of the battery device 2 provided in some embodiments of this application. As shown in Figure 2, the battery device 2 includes a housing 5 and battery cells 7, with the battery cells 7 housed within the housing 5. The battery cell 7 can be the smallest unit that makes up a battery.

[0096] The housing 5 is used to house the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0097] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0098] Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called the upper box cover, and the second box part 5b can also be called the lower box 5.

[0099]

[0100] Some embodiments of this application provide a battery cell 7. Referring to Figures 3 and 4, the battery cell 7 includes an electrode assembly (not shown), a housing 9, electrode terminals (not shown), and an insulating film 11. The electrode assembly includes tabs (not shown). The housing 9 includes a first wall 91, a second wall 92, and a third wall 93 connected to each other. The area of ​​the third wall 93 is larger than the area of ​​the first wall 91, and the area of ​​the third wall 93 is larger than the area of ​​the second wall 92. The electrode assembly is housed in the housing 9. The electrode terminals are disposed on the first wall 91 and electrically connected to the tabs. The insulating film 11 covers a portion of the second wall 92 and at least a portion of the third wall 93 from the outside. The insulating film 11 has a first opening 12, which is opposite to the second wall 92 in the thickness direction of the second wall 92.

[0101] Electrode assemblies are components within the battery cell 7 where electrochemical reactions occur. The housing 9 may contain one or more electrode assemblies. Each electrode assembly may include electrode plates and separators. The electrode plates may include positive or negative electrode plates with opposite polarities, serving as the positive and negative electrodes respectively. Separators are stacked between the positive and negative electrode plates to isolate them.

[0102] The electrode assembly may include an electrode body and a tab, the tab extending from one end of the electrode body for electrical connection with an electrode terminal to draw current from the electrode assembly.

[0103] The outer casing 9, as a component within the battery cell 7, forms a sealed space that accommodates other components within the battery cell 7, such as the electrolyte and electrode assembly. The outer casing 9 can be of various shapes and sizes, such as cuboid or hexagonal prism. Specifically, the shape of the outer casing 9 can be determined based on the specific shape and size of the electrode assembly. The outer casing 9 can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0104] The first wall 91, the second wall 92, and the third wall 93 are different wall structures in the outer shell 9. The area of ​​the third wall 93 is set to be larger than the areas of the first wall 91 and the second wall 92, making the third wall 93 the wall structure with the largest area in the outer shell 9.

[0105] For example, the area of ​​the second wall 92 may be set to be larger than the area of ​​the first wall 91, or the area of ​​the first wall 91 may be set to be larger than the area of ​​the second wall 92. Those skilled in the art can make the settings according to the actual situation.

[0106] The electrode terminals can be structures for connecting the battery cell 7 to an external electrical device or a charging device, so that the battery cell 7 can provide electrical energy to the external electrical device or the charging device can charge the battery cell 7.

[0107] The electrode terminal is disposed on the first wall 91. This can be either a single electrode terminal on the first wall 91 or two electrode terminals with opposite polarities disposed at intervals on the first wall 91. The electrode terminal is electrically connected to the electrode tab. This connection can be either direct or indirect via a current collector.

[0108] The insulating film 11 can be an insulating film structure disposed on the surface of the outer casing 9 of the battery cell 7. It is used to insulate the outer casing 9 from external devices and adjacent battery cells 7, so that the battery cell 7 is less likely to short circuit with external devices and adjacent battery cells 7, which helps to improve the reliability of the device.

[0109] The insulating film 11 covers a portion of the second wall 92 and at least a portion of the third wall 93 from the outside. This can be achieved by the insulating film 11 covering a portion of the second wall 92 and a portion of the third wall 93 from the outside, or by the insulating film 11 covering a portion of the second wall 92 and the entire third wall 93 from the outside. Those skilled in the art can adjust the area of ​​the insulating film 11 covering the second wall 92 and the third wall 93 according to the actual situation. For example, the first wall 91 may not have an insulating film 11, allowing the electrode terminals on the first wall 91 to be easily electrically connected to external electrical devices or charging devices.

[0110] The insulating film 11 covers a portion of the second wall 92 from the outside, so that the insulating film 11 has a first opening 12 without insulating material, and the first opening 12 is opposite to the second wall 92 along the thickness direction of the second wall 92, so that the part of the second wall 92 corresponding to the first opening 12 can be directly exposed to the outside world and can be directly connected to external devices, so that the outer shell 9 can be directly subjected to force.

[0111] In the above structure, the insulating film 11 covers a portion of the second wall 92 and at least a portion of the third wall 93 from the outside, achieving insulation isolation between the outer casing 9 and external devices. Since the first opening 12 is provided on the insulating film 11 opposite to the second wall 92, the second wall 92 can be directly connected to the external devices, allowing the outer casing 9 to be directly subjected to force. This allows the battery cell 7 to be more firmly fixed in the battery device 2 by the external devices, which is beneficial to improving the reliability of the battery device 2.

[0112] In some embodiments, there are two first walls 91, two second walls 92, and two third walls 93. The two first walls 91 are arranged opposite each other along a first direction X, the two second walls 92 are arranged opposite each other along a second direction Y, and the two third walls 93 are arranged opposite each other along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. There are two first openings 12, and the two first openings 12 are respectively opposite to the two second walls 92.

[0113] By setting two first walls 91, two second walls 92, and two third walls 93, with the two first walls 91 facing each other along the first direction X, the two second walls 92 facing each other along the second direction Y, and the two third walls 93 facing each other along the third direction Z, and with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other, the outer shell 9 formed by the first walls 91, the second walls 92, and the third walls 93 is a hexahedral structure, and the battery cell 7 is a cuboid structure.

[0114] By setting two first openings 12 and making the two first openings 12 opposite to the two second walls 92 respectively, the two first openings 12 are respectively set opposite to each other, so that the two walls of the outer shell 9 of the battery cell 7 opposite to each other in the second direction Y can be directly connected to the external components through the first openings 12, which helps to improve the firmness of the connection between the battery cell 7 and the external device.

[0115] In some embodiments, along the third direction Z, the shortest distance from the inner wall surface of the first opening 12 to the outer surface of the third wall 93 is A, 3mm≤A≤6mm; along the first direction X, the shortest distance from the inner wall surface of the first opening 12 to the outer surface of the first wall 91 is B, 3mm≤B≤15mm.

[0116] By setting the shortest distance from the inner wall surface of the first opening 12 to the outer surface of the third wall 93 along the third direction Z as A, and setting the shortest distance from the inner wall surface of the first opening 12 to the outer surface of the first wall 91 along the first direction X as B, where 3mm≤A≤6mm and 3mm≤B≤15mm, not only can the insulating film 11 effectively cover the edge portion of the second wall 92, ensuring that the portion of the second wall 92 without insulating material has a sufficiently long creepage distance with the adjacent battery cell 7, thus reducing the possibility of short circuits between the portion of the second wall 92 without insulating material and external devices, but also ensures that the first opening 12 has a sufficiently large area, allowing the portion of the second wall 92 without insulating material to directly connect with external devices, thereby improving the robustness of the connection between the battery cell 7 and external devices.

[0117] In some embodiments, 4mm≤A≤5mm, 5mm≤B≤10mm. Preferably, the shortest distance A from the outer surface of the third wall 93 along the third direction Z of the inner wall surface of the first opening 12 can be set to 4mm, 4.5mm or 5mm, and the shortest distance B from the outer surface of the first wall 91 along the first direction X of the inner wall surface of the first opening 12 can be set to 5mm, 8mm or 10mm, so that the insulating film 11 can effectively cover the edge portion of the second wall 92, so that the part of the second wall 92 without insulating material has a sufficiently long creepage distance with the adjacent battery cell 7, while the first opening 12 also has a sufficiently large area to directly connect with external devices, which is beneficial to improving the firmness of the connection between the battery cell 7 and the external device.

[0118] In some embodiments, referring to FIG5, the insulating film 11 includes a second insulating member 112 and two first insulating members 111 disposed opposite each other along a third direction Z. The first insulating member 111 includes a first main body region 1111 and a first flange region 1112 connected to the first main body region 1111. The first main body region 1111 is attached to a third wall 93. The first flange region 1112 is bent relative to the first main body region 1111 and attached to a second wall 92. The second insulating member 112 is connected to the first flange regions 1112 of the two first insulating members 111 and attached to the second wall 92. The first insulating member 111 and the first flange region 1112 are arranged around the outer periphery of the first opening 12.

[0119] The first insulating member 111 and the second insulating member 112 are different components in the insulating film 11. There are two first insulating members 111, which are arranged opposite each other along the third direction Z, so that the two first insulating members 111 can be attached to the two oppositely arranged third walls 93 to cover the third walls 93.

[0120] The first main body region 1111 may be the main structure in the first insulating member 111, which is used to cover the third wall 93. The first flange region 1112 may be a structure in the first insulating member 111 connected to the first main body region 1111 at the Y end in the second direction, which is bent relative to the first main body region 1111, so that the first flange region 1112 can be attached to the surface of the second wall 92 perpendicular to the third wall 93.

[0121] The second insulating member 112 is connected to the first flange area 1112 of the two first insulating members 111 and attached to the second wall 92. Alternatively, the second insulating member 112 may be attached to the surface of the second wall 92, and the two ends of the second insulating member 112 in the third direction Z are respectively connected to the first flange area 1112 of the two first insulating members 111, so that the second insulating member 112 and the first flange area 1112 are arranged around the outer periphery of the first opening 12, forming a first opening 12 without insulating material on the surface of the second wall 92.

[0122] For example, the first main body area 1111 is attached to the third wall 93, which can be achieved by adhesive bonding; the first flange area 1112 is attached to the second wall 92, which can be achieved by adhesive bonding; the second insulating member 112 is attached to the second wall 92, which can be achieved by adhesive bonding.

[0123] In some embodiments, the first main body region 1111 is attached to the third wall 93, which may be that the first main body region 1111 is connected to the third wall 93 by electrostatic adsorption; the first flange region 1112 is attached to the second wall 92, which may be that the first flange region 1112 is connected to the second wall 92 by electrostatic adsorption; the second insulating member 112 is attached to the second wall 92, which may be that the second insulating member 112 is connected to the second wall 92 by electrostatic adsorption.

[0124] In some embodiments, the second insulating member 112 further includes a second flanged region 1113 connected to the first body region 1111, the second flanged region 1113 being bent relative to the first body region 1111 and attached to the first wall 91.

[0125] The second flanged area 1113 may be a structure in the first insulating member 111 connected to the first main body area 1111 at the end in the first direction X, which is bent relative to the first main body area 1111, so that the second flanged area 1113 can be attached to the surface of the first wall 91 perpendicular to the third wall 93.

[0126] In some embodiments, the second insulating member 112 includes a second main body region 1121, which includes a second main region 11211 and two second sub-regions 11212. The two second sub-regions 11212 are connected to the two ends of the second main region 11211 in the third direction Z. The second main region 11211 is attached to the second wall 92. The two second sub-regions 11212 are respectively stacked with the first flange regions 1112 of the two first insulating members 111.

[0127] The second main body area 1121 may be the main structure located on the second wall 92 in the second insulating member 112, which together with the first flange area 1112 forms the first opening 12. The second main area 11211 and the second sub-area 11212 may be different interconnected parts of the second main body area 1121, wherein the second main area 11211 may be the part of the second main body area 1121 directly attached to the second wall 92, and the second sub-area 11212 may be the part used to connect with the first flange area 1112.

[0128] By connecting two second sub-regions 11212 to the two ends of the second main region 11211 in the third direction Z, and stacking the two second sub-regions 11212 with the first flanged regions 1112 of the two first insulating members 111 respectively, the second main region 1121 is connected to the first flanged regions 1112 of the two first insulating members 111 at the two ends of the second main region 112 in the third direction Z, so that the second insulating member 112 and the first insulating member 111 can be firmly connected.

[0129] In some embodiments, the second insulating member 112 further includes a flanged region 1122 connected to the second body region 1121, the flanged region 1122 being bent relative to the second body region 1121 and attached to the first wall 91 and the second flanged region 1113.

[0130] The flanged area 1122 may be the portion of the second insulating member 112 for connection with the first wall 91, which is connected to the second main body area 1121 and bent relative to the second main body area 1121 to connect with the first wall 91.

[0131] The flanged area 1122 is bent relative to the second main body area 1121, so that the flanged area 1122 can be attached to the first wall 91 and the second flanged area 1113. This not only increases the connection area between the second insulating member 112 and the outer shell 9, which helps to reduce the possibility of the second insulating member 112 falling off, but also reduces the area of ​​the first wall 91 directly exposed, which helps to improve the reliability of the battery cell 7.

[0132] In some embodiments, the flanged area 1122 includes a flanged main area 11221 and two flanged sub-areas 11222. The two flanged sub-areas 11222 are connected to the two ends of the flanged main area 11221 in the third direction Z. The flanged main area 11221 is attached to the first wall 91. The two flanged sub-areas 11222 are respectively stacked with the first flanged areas 1112 of the two first insulating members 111.

[0133] The main flanged area 11221 and the sub-flange area 11222 are different parts of the flanged area 1122. The main flanged area 11221 is attached to the first wall 91, and the sub-flange area 11222 is connected to the second flanged area 1113 of the first insulating member 111. By setting the sub-flange areas 11222 at both ends of the main flanged area 11221 along the third direction Z, and stacking the two sub-flange areas 11222 with the second flanged areas 1113 of the two first insulating members 111 respectively, the flanged area 1122 is connected to the second flanged areas 1113 of the two first insulating members 111 at both ends of the third direction Z. By attaching the main flanged area 11221 to the first wall 91, the flanged area 1122 can be firmly connected to the first wall 91.

[0134] In some embodiments, the flanged area 1122 and the second flanged area 1113 form a second opening 13. In the thickness direction of the first wall 91, the second opening 13 is opposite to the first wall 91, and the electrode terminal is located in the second opening 13.

[0135] The flanged area 1122 and the second flanged area 1113 form a second opening 13. This can mean that the flanged area 1122 and the second flanged area 1113 are connected together to form a second opening 13 on the first wall 91 without insulating material. The second opening 13 is opposite to the first wall 91 in the thickness direction.

[0136] The electrode terminals are located in the second opening 13. Alternatively, the electrode terminals disposed on the first wall 91 may extend from the second opening 13, thereby reducing the possibility that the insulating film 11 may affect the electrical connection between the electrode terminals and external devices.

[0137] In some embodiments, the distance between the outer surfaces of the two second walls 92 in the second direction Y is W, the distance between the outer surfaces of the two first walls 91 in the first direction X is L, and the sum of the size of the second main body area 1121 in the first direction X and the size of the flange area 1122 in the second direction Y is set to E, where A+B≤E≤25%(L+W).

[0138] By setting the distance between the outer surfaces of the two second walls 92 in the second direction Y to W, and the distance between the outer surfaces of the two first walls 91 in the first direction X to L, referring to Figure 6, the sum of the dimensions of the second main body region 1121 in the first direction X and the dimensions of the flange region 1122 in the second direction Y is set to E, and A+B≤E≤25%(L+W), not only can the second insulating member 112 extend the creepage distance between the first wall 91 and the adjacent battery cell 7, but it can also reduce the possibility of wasting materials in the second insulating member 112.

[0139] In some embodiments, the connection between the second wall 92 and the third wall 93 is provided with a rounded corner.

[0140] By setting rounded corners at the connection between the second wall 92 and the third wall 93, the mutually perpendicular second wall 92 and third wall 93 can transition smoothly, reducing the possibility of personnel being scratched by the sharp edges of the outer shell 9.

[0141] In some embodiments, the distance between the outer surfaces of the two third walls 93 in the third direction Z is T, the radius of the fillet is R, and the dimension of the second main body region 1121 along the third direction Z is D, where T-2B≤D≤T-2R.

[0142] By setting the distance between the outer surfaces of the two third walls 93 in the third direction Z to T, setting the radius of the rounded corner to R, setting the size of the second main body area 1121 in the third direction Z to D, and making T-2B≤D≤T-2R, not only is it difficult for the second main body area 1121 to be attached to the first flange area 1112 corresponding to the rounded corner, but the second main body area 1121 also has sufficient size to overlap with the first flange area 1112, so that the second insulating member 112 can be firmly connected to the first insulating member 111.

[0143] In some embodiments, referring to Figures 7 to 10, an insulating film 11 is wound around the outer surface of the housing 9. The insulating film 11 includes a first region 113, a second region 114 and a third region 115 arranged along the winding direction. The third region 115 is located outside the first region 113 and overlaps with the first region 113. The first opening 12 is located in the second region 114.

[0144] The insulating film 11 is wound around the outer surface of the outer shell 9. This means that the way the insulating film 11 is formed on the outer shell 9 is different from the way the first insulating member 111 and the second insulating member 112 are attached to the surface of the outer shell 9 to form the insulating film 11 in the aforementioned technical solution. Instead, the insulating film 11 is formed on the outer shell 9 by wrapping the insulating film 11 around the surface of the outer shell 9. The first region 113, the second region 114 and the third region 115 are three different regions in the insulating film 11. The first region 113, the second region 114 and the third region 115 are wound and covered on the surface of the outer shell 9 in sequence along the winding direction, so that the starting area of ​​the insulating film 11 is located in the first region 113 and the rewinding area of ​​the insulating film 11 is located in the third region 115.

[0145] The third region 115 is located outside the first region 113 and overlaps with the first region 113. This can mean that the third region 115 is stacked with the first region 113 and the third region 115 is attached to the outer surface of the first region 113, so that the insulating film 11 can be completely wrapped around the surface of the outer shell 9.

[0146] The first opening 12 is located in the second region 114. It can be that the insulating film 11 is wound around the outer surface of the outer shell 9 along the direction of the third wall 93, the second wall 92, the third wall 93 and the second wall 92, and the first opening 12 is disposed in the second region 114 and is opposite to the second wall 92 in the thickness direction of the second wall 92.

[0147] In some embodiments, referring to FIG7, the third region 115 and the first region 113 are attached to the third wall 93.

[0148] The third region 115 and the first region 113 are attached to the third wall 93. This can mean that the first region 113 is attached to the outer surface of the third wall 93, and the third region 115 is attached to the outer surface of the first region 113, such that the overlapping area of ​​the insulating film 11 is located on the outside of the third wall 93.

[0149] In some embodiments, referring to FIG8, the third region 115 and the first region 113 are attached to the second wall 92.

[0150] The third region 115 and the first region 113 are attached to the second wall 92. This can mean that the first region 113 is attached to the outer surface of the second wall 92, and the third region 115 is attached to the outer surface of the first region 113, such that the overlapping area of ​​the insulating film 11 is located on the outside of the second wall 92.

[0151] In some embodiments, the electrode terminals include a first terminal and a second terminal with opposite polarities, the first terminal and the second terminal being spaced apart and located in the second opening 13.

[0152] The first terminal and the second terminal are two electrode terminals with opposite polarities. By arranging the first terminal and the second terminal at intervals on the first wall 91 and located in the second opening 13, the first terminal and the second terminal can extend out from the second opening 13 so as to connect to external electrical devices or charging devices.

[0153] For example, the first terminal and the second terminal can be disposed on the same first wall 91 at intervals, or they can be disposed on two first walls 91 disposed opposite each other along the first direction X.

[0154] In some embodiments, the first terminal and the second terminal are disposed on one of the two first walls 91, and the other of the two first walls 91 is provided with a pressure relief structure 14, which is connected to the second opening 13.

[0155] The first terminal and the second terminal are disposed on one of the two first walls 91. This can mean that the first terminal and the second terminal, which are spaced apart, are disposed on the same of the two first walls 91, so that the battery cell 7 has two electrode terminals with opposite polarities on the same side.

[0156] The pressure relief structure 14 can be a structure for venting the internal gas of the battery cell 7. When the internal pressure or temperature of the battery cell 7 reaches a predetermined threshold, the pressure relief structure 14 performs an action or the weak structure provided in the pressure relief structure 14 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0157] By placing the pressure relief structure 14 on the other of the two first walls 91 and connecting the pressure relief structure 14 to the second opening 13, the insulating film 11 is less likely to affect the operation of the pressure relief structure 14.

[0158] Some embodiments of this application also provide a battery device 2, which includes a housing 5 assembly, an adhesive structure, and a battery cell 7 provided by any of the above technical solutions. The housing 5 assembly includes a housing 5, the battery cell 7 is located in the housing 5, and the second wall 92 opposite to the first opening 12 is bonded to the housing 5 by the adhesive structure.

[0159] The housing 5 assembly can be an assembly of the battery device 2 that includes a housing 5 for housing individual battery cells 7.

[0160] The second wall 92 opposite to the first opening 12 is bonded to the housing 5 through an adhesive structure. This means that the adhesive structure is bonded between the second wall 92 opposite to the first opening 12 and the inner wall surface of the housing 5, so that the outer shell 9 of the battery cell 7 can be directly bonded to the inner wall surface of the housing 5 through the adhesive structure, which improves the firmness of the connection between the battery cell 7 and the housing 5, and makes the battery cell 7 more firmly fixed in the housing 5.

[0161] In some embodiments, the housing 5 assembly further includes a heat exchange plate located in and connected to the housing 5, and a second wall 92 opposite to the first opening 12 is bonded to the heat exchange plate by an adhesive structure.

[0162] The heat exchange plate can be a device for exchanging heat with the battery cell 7. It is provided with a heat exchange channel for circulating heat exchange medium, so that the temperature of the heat exchange plate can be kept within a suitable range, thereby enabling the heat exchange plate to keep the temperature of the battery cell 7 within a suitable range.

[0163] By placing the heat exchange plate inside and connecting it to the housing 5, the heat exchange plate and housing 5 can be connected as a whole. The second wall 92 opposite to the first opening 12 of the battery cell 7 is bonded to the heat exchange plate by an adhesive structure, which not only improves the firmness of the connection between the battery cell 7 and the housing 5 assembly, but also allows the heat of the battery cell 7 to be better transferred to the heat exchange plate, which is beneficial to improving the heat exchange efficiency between the heat exchange plate and the battery cell 7.

[0164] For example, the adhesive structure can be a structure formed by bonding thermally conductive adhesive between the heat exchange plate and the first wall 91.

[0165] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the above-described technical solution, and the battery device 2 is used to provide electrical energy.

[0166] Some embodiments of this application provide a battery cell 7, which includes an electrode assembly, a housing 9, electrode terminals, and an insulating film 11. The electrode assembly includes tabs. The housing 9 includes a first wall 91, a second wall 92, and a third wall 93 connected to each other. The two first walls 91 are arranged opposite each other along a first direction X, the two second walls 92 are arranged opposite each other along a second direction Y, and the two third walls 93 are arranged opposite each other along a third direction Z. The area of ​​the third wall 93 is larger than the area of ​​the first wall 91 and the area of ​​the second wall 92 is larger than the area of ​​the second wall 92. The electrode assembly is housed in the housing 9. The electrode terminals are disposed on the first wall 91 and electrically connected to the tabs. The insulating film 11 covers a portion of the second wall 92 and at least a portion of the third wall 93 from the outside. The insulating film 11 has a first opening 12, which is opposite to the second wall 92 in the thickness direction of the second wall 92. The shortest distance A between the inner wall surface of the first opening 12 and the outer surface of the third wall 93 along the third direction Z is 3mm≤A≤6mm, and the shortest distance B between the inner wall surface of the first opening 12 and the outer surface of the first wall 91 along the first direction X is 3mm≤B≤15mm.

[0167] In the above structure, the insulating film 11 covers a portion of the second wall 92 and at least a portion of the third wall 93 from the outside, achieving insulation isolation between the outer casing 9 and external devices. Since the first opening 12 is provided on the insulating film 11 opposite to the second wall 92, the second wall 92 can be directly connected to the external devices, allowing the outer casing 9 to be directly subjected to force. This allows the battery cell 7 to be more firmly fixed in the battery device 2 by the external devices, which is beneficial to improving the reliability of the battery device 2.

[0168] 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 single battery cell, comprising: Electrode assembly, including tabs; The housing includes a first wall, a second wall, and a third wall that are interconnected, wherein the area of ​​the third wall is greater than the area of ​​the first wall and the area of ​​the third wall is greater than the area of ​​the second wall, and the electrode assembly is housed within the housing. Electrode terminals are disposed on the first wall and electrically connected to the electrode tabs; An insulating film that covers a portion of the second wall and at least a portion of the third wall from the outside, the insulating film having a first opening opposite to the second wall in the thickness direction of the second wall.

2. The battery cell according to claim 1, wherein, There are two first walls, two second walls, and two third walls. The two first walls are arranged opposite each other along a first direction, the two second walls are arranged opposite each other along a second direction, and the two third walls are arranged opposite each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. There are two first openings, and the two first openings are respectively opposite to the two second walls.

3. The battery cell according to claim 2, wherein, Along the third direction, the shortest distance from the inner wall surface of the first opening to the outer surface of the third wall is A, 3mm≤A≤6mm; along the first direction, the shortest distance from the inner wall surface of the first opening to the outer surface of the first wall is B, 3mm≤B≤15mm.

4. The battery cell according to claim 2 or 3, wherein, The insulating film includes a second insulating member and two first insulating members disposed opposite each other along the third direction. The first insulating member includes a first main body area and a first flange area connected to the first main body area. The first main body area is attached to the third wall. The first flange area is bent relative to the first main body area and attached to the second wall. The second insulating member is connected to the first flange areas of the two first insulating members and attached to the second wall. The first insulating member and the first flange area are arranged around the outer periphery of the first opening.

5. The battery cell according to claim 4, wherein, The second insulating member further includes a second flanged area connected to the first main body area, the second flanged area being bent relative to the first main body area and attached to the first wall.

6. The battery cell according to claim 5, wherein, The second insulating member includes a second main body area, which includes a second main area and two second sub-areas. The two second sub-areas are connected to the two ends of the second main area in the third direction. The second main area is attached to the second wall. The two second sub-areas are respectively stacked with the first flange areas of the two first insulating members.

7. The battery cell according to claim 6, wherein, The second insulating member further includes a flanged area connected to the second main body region, the flanged area being bent relative to the second main body region and attached to the first wall and the second flanged area.

8. The battery cell according to claim 7, wherein, The flanged area includes a main flanged area and two sub-flanges. The two sub-flanges are connected to the two ends of the main flanged area in the third direction. The main flanged area is attached to the first wall. The two sub-flanges are respectively stacked with the second flanged areas of the two first insulating members.

9. The battery cell according to claim 7 or 8, wherein, The flanged area and the second flanged area form a second opening. In the thickness direction of the first wall, the second opening is opposite to the first wall, and the electrode terminal is located in the second opening.

10. The battery cell according to any one of claims 7-9, wherein, The distance between the outer surfaces of the two second walls in the second direction is W, the distance between the outer surfaces of the two first walls in the first direction is L, and the sum of the dimensions of the second main body area in the first direction and the dimensions of the flange area in the second direction is set to E, where A+B≤E≤25%(L+W).

11. The battery cell according to any one of claims 6-10, wherein, The connection between the second wall and the third wall is provided with rounded corners.

12. The battery cell according to claim 11, wherein, The distance between the outer surfaces of the two third walls in the third direction is T, the radius of the fillet is R, and the dimension of the second main body area along the third direction is D, where T-2B≤D≤T-2R.

13. The battery cell according to any one of claims 1-12, wherein, The insulating film is wound around the outer surface of the housing. The insulating film includes a first region, a second region, and a third region arranged along the winding direction. The third region is located outside the first region and is stacked with the first region. The first opening is located in the second region.

14. The battery cell according to claim 13, wherein, The third region and the first region are attached to the third wall.

15. The battery cell according to claim 13 or 14, wherein, The third region and the first region are attached to the second wall.

16. The battery cell according to claim 9, wherein, The electrode terminals include a first terminal and a second terminal with opposite polarities, the first terminal and the second terminal being spaced apart and located in the second opening.

17. The battery cell according to claim 16, wherein, The first terminal and the second terminal are disposed on one of the two first walls, and the other of the two first walls is provided with a pressure relief structure, which is connected to the second opening.

18. A battery device comprising a housing assembly, an adhesive structure, and a battery cell as claimed in any one of claims 1 to 17, wherein the housing assembly includes a housing, the battery cell is located within the housing, and a second wall opposite to the first opening is adhesively bonded to the housing via the adhesive structure.

19. The battery device according to claim 18, wherein, The housing assembly also includes a heat exchange plate located in and connected to the housing, and the second wall opposite the first opening is bonded to the heat exchange plate by the adhesive structure.

20. An electrical device comprising a battery device as described in claim 18 or 19, the battery device being used to provide electrical energy.

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