Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery cell includes a housing, an electrode assembly, a first insulator, and a second insulator. The shell comprises a shell body and an end cover, the shell body is provided with an opening, and the end cover seals the opening. The electrode assembly is housed within the housing. The first insulating part is contained in the shell, the first insulating part is arranged on the side, facing the electrode assembly, of the end cover, and the first insulating part is configured to insulate and isolate the end cover and the electrode assembly. At least part of the second insulating part is arranged between the first insulating part and the end cover, in a projection plane perpendicular to the first direction, the orthographic projection of the second insulating part and the orthographic projection of the electrode assembly are at least partially overlapped, and the material damage temperature of the second insulating part is higher than that of the first insulating part. The battery monomer can reduce the risk of short circuit of the end cover and the electrode assembly, so that the risk of thermal runaway of the battery monomer is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. Besides considering the performance of individual battery cells, their reliability is also a crucial issue. Therefore, improving the reliability of individual battery cells is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a first insulating member, and a second insulating member; the casing includes a housing and an end cap, the housing having an opening at at least one end along a first direction, and the end cap closing the opening; the electrode assembly is housed within the casing; the first insulating member is housed within the casing, at least a portion of the first insulating member being disposed between the end cap and the electrode assembly, the first insulating member being configured to insulate and isolate the end cap and the electrode assembly; at least a portion of the second insulating member is disposed between the first insulating member and the end cap, and in a projection plane perpendicular to the first direction, the orthographic projection of the second insulating member and the orthographic projection of the electrode assembly at least partially overlap, and the material damage temperature of the second insulating member is greater than the material damage temperature of the first insulating member.

[0006] In the above technical solution, by placing the second insulating member between the first insulating member and the end cap, on the one hand, both the first and second insulating members can insulate and isolate the electrode assembly and the end cap, providing double-layer insulation and improving the insulation effect of the electrode assembly and the end cap; on the other hand, the first insulating member and the end cap can restrict the position of the second insulating member, improving its structural stability. By setting the material damage temperature of the second insulating member to be higher than that of the first insulating member, even when the first insulating member is melted at high temperature, the second insulating member can still play a certain role in insulating the end cap and the electrode assembly, reducing the risk of short circuit between the end cap and the electrode assembly during battery cell use, thereby reducing the risk of thermal runaway of the battery cell and improving its reliability.

[0007] In some embodiments, the material damage temperature of the second insulating element is greater than or equal to 200°C. By setting the material damage temperature of the second insulating element to be greater than or equal to 200°C, the risk of the second insulating element melting at high temperatures can be reduced, thereby reducing the risk of short circuit between the end cap and electrode assembly during battery cell use, and further reducing the risk of thermal runaway of the battery cell, thus improving the reliability of the battery cell.

[0008] In some embodiments, the material damage temperature of the second insulating component is greater than or equal to 250°C. This further reduces the risk of the second insulating component melting at high temperatures, thereby further reducing the risk of short circuits between the end cap and electrode assembly during battery cell use, reducing the risk of thermal runaway of the battery cell, and further improving the reliability of the battery cell.

[0009] In some embodiments, the orthographic projection of the electrode assembly along a first direction lies within the area defined by the outer edge of the second insulator. This allows the second insulator to cover the outer edge of the electrode assembly, thereby further reducing the risk of short circuits due to contact with the end cap and improving the reliability of the battery cell.

[0010] In some embodiments, the battery cell further includes electrode terminals disposed on the end cap, passing through the end cap, the second insulator, and the first insulator, and locking the end cap, the second insulator, and the first insulator in place. In this way, the electrode terminals can fix the end cap, the second insulator, and the first insulator, thereby reducing the risk of the first and second insulators detaching from the end cap, allowing the first and second insulators to remain between the end cap and the electrode assembly, improving the positional stability of the first and second insulators, and reducing the risk of short circuit due to contact between the electrode assembly and the end cap.

[0011] In some embodiments, the electrode terminal includes a first limiting portion, a main body portion, and a second limiting portion. The main body portion connects the first limiting portion and the second limiting portion, and the main body portion passes through the end cap, the second insulating member, and the first insulating member. The first limiting portion and the second limiting portion are configured to cooperate in clamping the end cap, the second insulating member, and the first insulating member. By providing the first limiting portion and the second limiting portion, the end cap, the second insulating member, and the first insulating member can be cooperated in clamping, making the positions of the end cap, the second insulating member, and the first insulating member more stable, reducing the risk of the first insulating member and the second insulating member detaching from the end cap, and making the structure of the battery cell more stable.

[0012] In some embodiments, a first insulating member is connected to an end cap and, together with the end cap, defines a receiving cavity, within which at least a portion of a second insulating member is received. By connecting the first insulating member to the end cap, the positions of the first insulating member and the end cap are relatively stable. The fact that at least a portion of the second insulating member is received within the receiving cavity allows the cavity to constrain the position of the second insulating member, thereby further stabilizing its position and reducing the risk of the second insulating member detaching from the end cap and the first insulating member.

[0013] In some embodiments, the second insulating member is bonded to the surface of the end cap facing the electrode assembly. This provides a more stable connection between the second insulating member and the end cap, reducing the risk of the second insulating member detaching from the end cap and ensuring its stable position between the end cap and the electrode assembly. This reduces the risk of short circuits due to contact between the electrode assembly and the end cap, thus improving the reliability of the battery cell.

[0014] In some embodiments, the second insulating element includes an insulating coating applied to the surface of the end cap facing the electrode assembly. This reduces the difficulty of installing the second insulating element and improves its positional stability.

[0015] In some embodiments, the second insulator is made of polyimide, fluoroplastic, ceramic, asbestos, or polyphenylene sulfide. This allows the second insulator to withstand high temperatures, reducing the risk of short circuits due to contact between the electrode assembly and the end cap.

[0016] In some embodiments, the first insulating element is made of polyethylene, polypropylene, polyester, polyoxymethylene, nylon, polyurethane, or polycarbonate.

[0017] Secondly, embodiments of this application provide a battery device, including the battery cell provided in any one of the embodiments of the first aspect.

[0018] Thirdly, embodiments of this application provide an electrical device, including a battery cell provided in any one of the embodiments of the first aspect or a battery device provided in any one of the embodiments of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0021] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0022] Figure 3 Exploded views of a single battery cell provided in some embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0024] Figure 5 for Figure 4 AA section view;

[0025] Figure 6 for Figure 5 A magnified view of a portion of region A in the middle;

[0026] Figure 7 This is a schematic diagram of the end cap structure provided in some embodiments of this application;

[0027] Figure 8 for Figure 7 BB cross-sectional view.

[0028] Icons: 1-Outer shell; 1a-Accommodation space; 11-Shell; 11a-Opening; 12-End cap; 2-Electrode assembly; 3-First insulating component; 4-Second insulating component; 5-Electrode terminal; 51-First limiting part; 511-First surface; 52-Main body; 53-Second limiting part; 531-Second surface; 6-Accommodation cavity; 7-Pressure relief mechanism;

[0029] 10 - Battery cell; 20 - Housing; 201 - First housing; 202 - Second housing; 100 - Battery unit; 200 - Controller; 300 - Motor; 1000 - Vehicle; X - First direction. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In this application, "multiple" means two or more (including two).

[0036] 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.

[0037] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0038] 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, reduces the risk of short circuits while allowing active ions to pass through.

[0039] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0040] 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.

[0041] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0042] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0043] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0044] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0045] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0046] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0047] 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.

[0048] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0049] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0050] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0051] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0052] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0053] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0054] In some embodiments, the electrolyte salt may include 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.

[0055] In some embodiments, the 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, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from 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.

[0056] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0057] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0058] 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.

[0059] As an example, inorganic solid electrolytes may include 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 phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0060] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0061] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0062] In some implementations, the electrode assembly is a stacked structure.

[0063] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0064] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0065] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0066] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0067] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0068] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0069] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0070] In some embodiments, the 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.

[0071] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0072] 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, which are connected in series, parallel, or mixed connections via a busbar.

[0073] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0074] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0075] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0076] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0077] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0078] 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.

[0079] 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.

[0080] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0081] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0082] Battery cells typically contain an insulating component (lower plastic layer) to insulate and isolate the cell's end cap and electrode assembly, reducing the risk of short circuits caused by electrode assembly contact with the end cap. However, the insulating component is susceptible to melting due to the high internal temperatures of the battery cell, increasing the risk of contact between the end cap and electrode assembly. Short circuits caused by contact can easily lead to thermal runaway in the battery cell, posing a risk of fire and explosion, thus affecting the battery cell's reliability.

[0083] In view of this, this application provides a battery cell including a casing, an electrode assembly, a first insulating member, and a second insulating member. The casing includes a housing and an end cap, the housing having an opening at at least one end along a first direction, and the end cap closing the opening. The electrode assembly is housed within the casing. The first insulating member is housed within the casing and is disposed along the first direction on the side of the end cap facing the electrode assembly, the first insulating member being configured to insulate and isolate the end cap and the electrode assembly. At least a portion of the second insulating member is disposed between the first insulating member and the end cap, and in a projection plane perpendicular to the first direction, the orthographic projection of the second insulating member and the orthographic projection of the electrode assembly at least partially overlap, the material damage temperature of the second insulating member being greater than the material damage temperature of the first insulating member.

[0084] In such a battery cell, by setting the material damage temperature of the second insulating component to be greater than that of the first insulating component, the second insulating component can still function as an insulating end cap and electrode assembly to a certain extent when the first insulating component melts at high temperature. This reduces the risk of short circuit between the end cap and electrode assembly during battery cell use, thereby reducing the risk of thermal runaway of the battery cell and improving the reliability of the battery cell.

[0085] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0086] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0087] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0088] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0089] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 , Figure 2 The following is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 20 and a battery cell 10, wherein the housing 20 is used to house the battery cell 10.

[0091] The housing 20 has an enclosed space inside for accommodating the battery cell 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which are interlocked. The first housing 201 and the second housing 202 can have various shapes, such as cuboids or cylinders. The first housing 201 can be a hollow structure open on one side, and the second housing 202 can also be a hollow structure open on one side. The open side of the second housing 202 interlocks with the open side of the first housing 201, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 201 can be a hollow structure open on one side, and the second housing 202 can be a plate-like structure, with the second housing 202 interlocked with the open side of the first housing 201, thus forming a housing 20 with a accommodating cavity.

[0092] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 10 is housed within the housing 20.

[0093] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery cells 10 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 10. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0094] Please refer to Figures 3-5 , Figure 3 Exploded views of a battery cell 10 provided in some embodiments of this application; Figure 4 This is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of this application; Figure 5 for Figure 4A cross-sectional view (AA). This application provides a battery cell 10, including a housing 1, an electrode assembly 2, a first insulating member 3, and a second insulating member 4. The housing 1 includes a shell 11 and an end cap 12. The shell 11 has an opening 11a at at least one end along a first direction X, and the end cap 12 closes the opening 11a. The electrode assembly 2 is housed within the housing 1. The first insulating member 3 is housed within the housing 1 and is disposed along the first direction X on the side of the end cap 12 facing the electrode assembly 2. The first insulating member 3 is configured to insulate and isolate the end cap 12 and the electrode assembly 2. At least a portion of the second insulating member 4 is disposed between the first insulating member 3 and the end cap 12. In a projection plane perpendicular to the first direction X, the orthographic projection of the second insulating member 4 and the orthographic projection of the electrode assembly 2 at least partially overlap. The material damage temperature of the second insulating member 4 is greater than the material damage temperature of the first insulating member 3.

[0095] The outer casing 1 includes a housing 11 and end caps 12. The housing 11 may have an opening 11a at only one end along the first direction X, with one end cap 12 closing the opening 11a; alternatively, the housing 11 may have openings 11a at both opposite ends along the first direction X, with two end caps 12 closing the two openings 11a respectively. The housing 11 and end caps 12 together define a receiving space 1a, within which the electrode assembly 2 is received. The shape of the opening 11a is adapted to the shape of the end cap 12. The end cap 12 may be made of a material with a certain strength and hardness (such as aluminum alloy), so that the end cap 12 is not easily deformed under pressure or impact, allowing the battery cell 10 to have higher structural strength and improve the reliability of the battery cell 10. The end cap 12 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. It is understood that the first direction X is parallel to the thickness direction of the end cap 12.

[0096] The housing 1 can accommodate one or more electrode assemblies 2. The electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and usually a separator is provided between the positive and negative electrode sheets. During the charging and discharging process of the battery cell 10, the positive and negative electrode sheets exchange ions through the separator. For example, during the charging and discharging process of the lithium-ion battery cell 10, the positive and negative electrode sheets exchange lithium ions through the separator.

[0097] The first insulating member 3 is located inside the housing 1 and is disposed on the side facing the electrode assembly 2. The entire first insulating member 3 may be located between the end cap 12 and the electrode assembly 2; alternatively, a portion of the first insulating member 3 may be located between the end cap 12 and the electrode assembly 2, while another portion extends away from the end cap 12. In an embodiment where there is only one end cap 12, there may be only one first insulating member 3, which insulates and isolates the end cap 12 and the electrode assembly 2. Alternatively, there may be multiple first insulating members 3, which insulate and isolate the end cap 12 and the electrode assembly 2. In embodiments where there are multiple end caps 12, the first insulating members 3 and end caps 12 may correspond one-to-one, with one first insulating member 3 corresponding to one end cap 12 and one electrode assembly 2; alternatively, one end cap 12 may correspond to multiple first insulating members 3, which together insulate and isolate one end cap 12 and the electrode assembly 2. The first insulating member 3 can be connected to either the end cap 12 or the electrode assembly 2. For example, the first insulating member 3 can be bonded to the end cap 12. Alternatively, the first insulating member 3 can be located between the end cap 12 and the electrode assembly 2, with its two ends along the first direction X abutting against the end cap 12 and the electrode assembly 2, respectively. In some embodiments, the first insulating member 3 is made of plastic.

[0098] The second insulating member 4 may be located inside the outer casing 1. Alternatively, the entire second insulating member 4 may be located between the first insulating member 3 and the end cap 12; or only a portion of the second insulating member 4 may be located between the first insulating member 3 and the end cap 12. In a projection plane perpendicular to the first direction X, the orthographic projection of the second insulating member 4 may completely overlap with the orthographic projection of the electrode assembly 2; or the orthographic projection of the second insulating member 4 may be located within the orthographic projection of the electrode assembly 2, with the orthographic projection area of ​​the second insulating member 4 being smaller than the orthographic projection area of ​​the electrode assembly 2; or the orthographic projection of the electrode assembly 2 may be located within the orthographic projection of the second insulating member 4, with the orthographic projection of the electrode assembly 2 being smaller than the orthographic projection of the second insulating member 4. It is understood that in a projection plane perpendicular to the second direction, the second insulating member 4 can insulate and isolate the end cap 12 and the area it covers of the electrode assembly 2. Therefore, the more area the second insulating member 4 covers of the electrode assembly 2, the better its insulation effect on the end cap 12 and the electrode assembly 2.

[0099] The material damage temperature of a substance can be either its melting point or its decomposition temperature. A substance undergoes a decomposition reaction at a certain temperature; that temperature is the decomposition temperature. If a substance has both a melting point and a decomposition temperature, the decomposition temperature is its material damage temperature. If a substance only has a melting point and no decomposition temperature, the melting point is its material damage temperature. If a substance only has a decomposition temperature and no melting point, the decomposition temperature is its material damage temperature.

[0100] The material damage temperature of the second insulating component 4 is greater than that of the first insulating component 3, so that the second insulating component 4 is more heat-resistant than the first insulating component 3. Thus, after the first insulating component 3 is damaged, the second insulating component 4 can maintain insulation of the end cap 12 and the electrode assembly 2.

[0101] In this embodiment, by placing the second insulating member 4 between the first insulating member 3 and the end cap 12, on the one hand, both the first insulating member 3 and the second insulating member 4 can insulate and isolate the electrode assembly 2 and the end cap 12, thus providing double-layer insulation between the electrode assembly 2 and the end cap 12 and improving the insulation effect of the electrode assembly 2 and the end cap 12; on the other hand, the first insulating member 3 and the end cap 12 can restrict the position of the second insulating member 4, improving the structural stability of the second insulating member 4. By setting the material damage temperature of the second insulating member 4 to be greater than that of the first insulating member 3, when the first insulating member 3 is melted at high temperature, the second insulating member 4 can still play a certain role in insulating the end cap 12 and the electrode assembly 2, reducing the risk of short circuit between the end cap 12 and the electrode assembly 2 during the use of the battery cell 10, thereby reducing the risk of thermal runaway of the battery cell 10 and improving the reliability of the battery cell 10.

[0102] In some embodiments, the material damage temperature of the second insulating element 4 is greater than or equal to 200°C.

[0103] The material damage temperature of the second insulating component 4 can be 200℃, 205℃, 210℃, 215℃, 220℃, 225℃, 230℃, 235℃, 240℃, 245℃, 250℃, 255℃, 260℃, 265℃, 270℃, 275℃, 280℃, 285℃, 290℃, 295℃, 300℃, 320℃, 350℃, 380℃, 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, 1000℃, 2000℃, etc.

[0104] The material damage temperature of both the second insulating component 4 and the first insulating component 3 can be greater than or equal to 200°C; alternatively, the material damage temperature of the second insulating component 4 can be greater than or equal to 200°C, while the material damage temperature of the first insulating component 3 can be less than 200°C. For example, the material damage temperature of the first insulating component 3 is 165°C, and the material damage temperature of the second insulating component 4 is 280°C.

[0105] By setting the material damage temperature of the second insulating component 4 to be greater than or equal to 200°C, the risk of the second insulating component 4 melting due to high temperature can be reduced, thereby reducing the risk of short circuit between the end cap 12 and the electrode assembly 2 during the use of the battery cell 10, and further reducing the risk of thermal runaway of the battery cell 10, thus improving the reliability of the battery cell 10.

[0106] In some embodiments, the material damage temperature of the second insulating element 4 is greater than or equal to 250°C.

[0107] The material damage temperature of the second insulating component 4 can be 250℃, 255℃, 260℃, 265℃, 270℃, 275℃, 280℃, 285℃, 290℃, 295℃, 300℃, 320℃, 350℃, 380℃, 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, 1000℃, 2000℃, etc.

[0108] In this embodiment, the risk of the second insulating component 4 melting due to high temperature can be further reduced, thereby further reducing the risk of short circuit between the end cap 12 and the electrode assembly 2 during the use of the battery cell 10, reducing the risk of thermal runaway of the battery cell 10, and further improving the reliability of the battery cell 10.

[0109] In some embodiments, the orthographic projection of the electrode assembly 2 along the first direction X is located within the area defined by the outer edge of the second insulating member 4.

[0110] The second insulating member 4 can cover the electrode assembly 2 along the first direction X, and the projected area of ​​the second insulating member 4 along the first direction X is larger than the projected area of ​​the electrode assembly 2. Alternatively, the orthographic projection of a portion of the electrode assembly 2 along the first direction X can not overlap with the orthographic projection of the second insulating member 4 along the first direction X; for example, the end cap 12 is provided with an electrode terminal 5, and the second insulating member 4 is provided with a hole through which the power supply terminal 5 passes, and the electrode terminal 5 passes through the hole to be electrically connected to the electrode assembly 2. The area of ​​the second insulating member 4 with the hole can overlap with the electrode assembly 2 along the first direction X, that is, in this area, the second insulating member 4 has no part that overlaps with the electrode assembly 2.

[0111] In this embodiment, the second insulating member 4 can cover the outer edge of the electrode assembly 2, thereby further reducing the risk of short circuit when the electrode assembly 2 contacts the end cap 12 and improving the reliability of the battery cell 10.

[0112] In some embodiments, please refer to Figure 6 , Figure 6 for Figure 5 A partial enlarged view of area A in the middle. The battery cell 10 also includes an electrode terminal 5, which is disposed on the end cover 12. The electrode terminal 5 passes through the end cover 12, the second insulating member 4 and the first insulating member 3, and locks the end cover 12, the second insulating member 4 and the first insulating member 3.

[0113] There can be one or more electrode terminals 5. The battery cell 10 has a positive electrode lead and a negative electrode lead, both of which are electrically connected to the electrode assembly 2. The battery cell 10 inputs or outputs electrical energy through the positive electrode lead and the negative electrode lead.

[0114] In an embodiment where there is one electrode terminal 5, the electrode terminal 5 is disposed on the end cover 12. The electrode terminal 5 may be a positive lead-out portion and the negative lead-out portion may be part of the outer shell 1, for example, the outer shell 11 may be a negative lead-out portion; or the electrode terminal 5 may be a negative lead-out portion and the positive lead-out portion may be part of the outer shell 1, for example, the outer shell 11 may be a positive lead-out portion.

[0115] In embodiments where there are multiple electrode terminals 5, all electrode terminals 5 are disposed on the end cap 12, with some electrode terminals 5 being positive leads and others being negative leads.

[0116] In this embodiment, the electrode terminal 5 can fix the end cap 12, the second insulating member 4 and the first insulating member 3, thereby reducing the risk of the first insulating member 3 and the second insulating member 4 detaching from the end cap 12, so that the first insulating member 3 and the second insulating member 4 can be kept between the end cap 12 and the electrode assembly 2, improving the positional stability of the first insulating member 3 and the second insulating member 4, and reducing the risk of short circuit due to contact between the electrode assembly 2 and the end cap 12.

[0117] In some embodiments, the battery cell 10 includes an electrode terminal 5 disposed in the housing 11, and at least a portion of the first insulating member 3 and at least a portion of the second insulating member 4 are disposed between the end cap 12 and the electrode assembly 2.

[0118] In some embodiments, the battery cell 10 further includes a pressure relief mechanism 7 disposed on the housing 1; for example, the pressure relief mechanism 7 is disposed on the end cap 12, and along the first direction X, the pressure relief mechanism 7 and the second insulating member 4 do not overlap at least partially.

[0119] In some embodiments, please continue to refer to Figure 6 The electrode terminal 5 includes a first limiting part 51, a main body part 52, and a second limiting part 53. The main body part 52 connects the first limiting part 51 and the second limiting part 53. The main body part 52 passes through the end cover 12, the second insulating member 4, and the first insulating member 3. The first limiting part 51 and the second limiting part 53 are configured to cooperate in clamping the end cover 12, the second insulating member 4, and the first insulating member 3.

[0120] The main body 52 can be integrally formed with the first limiting part 51 and the second limiting part 53; alternatively, the main body 52 can be integrally formed with one of the first limiting part 51 and the second limiting part 53, and fixedly connected to the other, for example, the main body 52 can be riveted to one of the first limiting part 51 and the second limiting part 53. The first limiting part 51 and the second limiting part 53 cooperate to clamp the end cap 12, the second insulating member 4 and the first insulating member 3 to fix the relative positions of the end cap 12, the second insulating member 4 and the first insulating member 3.

[0121] For example, such as Figure 6As shown, the first insulating member 3 and the second insulating member 4 have a first surface 511 and a second surface 531 respectively disposed opposite to each other. A portion of the end cap 12, a portion of the first insulating member 3 and a portion of the first insulating member 3 are located between the first surface 511 and the second surface 531, so that the first limiting portion 51 and the second limiting portion 53 can cooperate to clamp the end cap 12, the second insulating member 4 and the first insulating member 3.

[0122] By setting the first limiting part 51 and the second limiting part 53, the end cover 12, the second insulating member 4 and the first insulating member 3 can be clamped together, making the positions of the end cover 12, the second insulating member 4 and the first insulating member 3 more stable, reducing the risk of the first insulating member 3 and the second insulating member 4 detaching from the end cover 12, and making the structure of the battery cell 10 more stable.

[0123] In some embodiments, please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of the end cap 12 provided in some embodiments of this application; Figure 8 for Figure 7 BB cross-sectional view. The first insulating member 3 is connected to the end cap 12 and together with the end cap 12 defines the receiving cavity 6, and at least a portion of the second insulating member 4 is received within the receiving cavity 6.

[0124] The first insulating member 3 can be bonded or snapped onto the end cap 12. The second insulating member 4 can be entirely contained within the receiving cavity 6, or only a portion of the second insulating member 4 can be contained within the receiving cavity 6.

[0125] By connecting the first insulating member 3 to the end cap 12, the positions of the first insulating member 3 and the end cap 12 are relatively stable. At least a portion of the second insulating member 4 is accommodated within the receiving cavity 6, so that the receiving cavity 6 can restrict the position of the second insulating member 4, thereby making the position of the second insulating member 4 more stable and reducing the risk of the second insulating member 4 detaching from the end cap 12 and the first insulating member 3.

[0126] In some embodiments, the second insulating member 4 is bonded to the surface of the end cap 12 facing the electrode assembly 2.

[0127] In an embodiment where there is one end cap 12, the second insulating member 4 is bonded to the surface of the end cap 12 facing the electrode assembly 2. In an embodiment where there are multiple end caps 12, the second insulating member 4 is bonded to the surface of each end cap 12 facing the electrode assembly 2.

[0128] In this embodiment, the connection between the second insulating member 4 and the end cap 12 is more stable, reducing the risk of the second insulating member 4 detaching from the end cap 12. This allows the second insulating member 4 to be stably positioned between the end cap 12 and the electrode assembly 2, thereby reducing the risk of short circuit due to contact between the electrode assembly 2 and the end cap 12 and improving the reliability of the battery cell 10.

[0129] In some embodiments, the second insulating element 4 includes an insulating coating applied to the surface of the end cap 12 facing the electrode assembly 2.

[0130] The end cap 12 may be coated with an insulating coating on the entire surface facing the electrode assembly 2; alternatively, only a portion of the end cap 12 facing the electrode assembly 2 may be coated with an insulating coating. The insulating coating may be made of ceramic fiber, alumina ceramic, or the like.

[0131] In this embodiment, the difficulty of setting the second insulating member 4 is reduced, and the positional stability of the second insulating member 4 is improved.

[0132] In some embodiments, the second insulating element 4 is made of polyimide, fluoroplastic, ceramic, asbestos, or polyphenylene sulfide.

[0133] The material of the second insulating component 4 is any one of polyimide, fluoroplastic, ceramic, asbestos or polyphenylene sulfide, and the material damage temperature of the second insulating component 4 is greater than or equal to 200°C.

[0134] In this embodiment, the second insulating element 4 can withstand high temperatures, reducing the risk of short circuits caused by contact between the electrode assembly 2 and the end cap 12.

[0135] In some embodiments, the first insulating element 3 is made of polyethylene, polypropylene, polyester, polyoxymethylene, nylon, polyurethane, or polycarbonate.

[0136] In some embodiments, the first insulating element 3 is a plastic made of polyethylene, polypropylene, polyester, polyoxymethylene, nylon, polyurethane, or polycarbonate.

[0137] This application provides a battery device 100, which includes a battery cell 10 provided in any of the above embodiments.

[0138] This application provides an electrical device, including a battery cell 10 or a battery device 100 provided in any of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0139] Please continue to refer to Figures 3-6This application provides a battery cell 10, including a housing 1, an electrode assembly 2, a first insulating member 3, a second insulating member 4, and electrode terminals 5. The housing 1 includes a shell 11 and an end cap 12. The shell 11 has an opening 11a at one end along a first direction X, and the end cap 12 closes the opening 11a. The electrode assembly 2 is housed within the housing 1. The electrode terminals 5 are disposed on the end cap 12. The first insulating member 3 is housed within the housing 1 and is disposed along the first direction X on the side of the end cap 12 facing the electrode assembly 2. The first insulating member 3 is configured to insulate and isolate the end cap 12 and the electrode assembly 2. The material damage temperature of the second insulating member 4 is greater than the material damage temperature of the first insulating member 3. The electrode terminal 5 includes a first limiting portion 51, a main body portion 52, and a second limiting portion 53. The main body portion 52 connects the first limiting portion 51 and the second limiting portion 53, and passes through the end cap 12, the second insulating member 4, and the first insulating member 3. The first limiting portion 51 and the second limiting portion 53 are configured to clamp the end cap 12, the second insulating member 4, and the first insulating member 3. The second insulating member 4 includes an insulating coating applied to the surface of the end cap 12 facing the electrode assembly 2, and the second insulating member 4 is located between the first insulating member 3 and the end cap 12. In a projection plane perpendicular to the first direction X, the orthographic projection of the second insulating member 4 and the orthographic projection of the electrode assembly 2 partially overlap, and the material damage temperature of the second insulating member 4 is greater than or equal to 250°C.

[0140] In this embodiment, by placing the second insulating member 4 between the first insulating member 3 and the end cap 12, on the one hand, both the first insulating member 3 and the second insulating member 4 can insulate and isolate the electrode assembly 2 and the end cap 12, thus providing double-layer insulation between the electrode assembly 2 and the end cap 12 and improving the insulation effect of the electrode assembly 2 and the end cap 12; on the other hand, the first insulating member 3 and the end cap 12 can restrict the position of the second insulating member 4, improving the structural stability of the second insulating member 4. By setting the material damage temperature of the second insulating member 4 to be greater than or equal to 250°C, the risk of the second insulating member 4 melting at high temperatures can be reduced, thereby reducing the risk of short circuit between the end cap 12 and the electrode assembly 2 during the use of the battery cell 10, and further reducing the risk of thermal runaway of the battery cell 10, thus improving the reliability of the battery cell 10. When the first insulating member 3 melts at high temperatures, the second insulating member 4 can still play a certain role in insulating the end cap 12 and the electrode assembly 2, reducing the risk of short circuit due to contact between the electrode assembly 2 and the end cap 12, and improving the reliability of the battery cell 10. By setting the first limiting part 51 and the second limiting part 53, the end cover 12, the second insulating member 4 and the first insulating member 3 can be clamped together, making the positions of the end cover 12, the second insulating member 4 and the first insulating member 3 more stable, reducing the risk of the first insulating member 3 and the second insulating member 4 detaching from the end cover 12, and making the structure of the battery cell 10 more stable.

[0141] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0142] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing comprising a shell having an opening at at least one end in a first direction and an end cover closing the opening; an electrode assembly accommodated in the housing; a first insulation member accommodated in the housing, at least a portion of the first insulation member being disposed between the end cover and the electrode assembly, the first insulation member being configured to insulate the end cover and the electrode assembly; a second insulation member at least partially disposed between the first insulation member and the end cover, a projection of the second insulation member and a projection of the electrode assembly at least partially overlap in a projection plane perpendicular to the first direction, a material damage temperature of the second insulation member being greater than a material damage temperature of the first insulation member.

2. The battery cell of claim 1, wherein, The material damage temperature of the second insulation member is greater than or equal to 200℃.

3. The battery cell of claim 1, wherein, The material damage temperature of the second insulation member is greater than or equal to 250℃.

4. The battery cell of claim 1, wherein, A projection of the electrode assembly in the first direction is located within an area defined by an outer edge of the second insulation member.

5. The battery cell of any one of claims 1-4, wherein, The battery cell further comprises an electrode terminal disposed on the end cover, the electrode terminal penetrating through the end cover, the second insulation member and the first insulation member, and locking the end cover, the second insulation member and the first insulation member.

6. The battery cell of claim 5, wherein, The electrode terminal comprises a first limiting portion, a main body portion and a second limiting portion, the main body portion connecting the first limiting portion and the second limiting portion, the main body portion penetrating through the end cover, the second insulation member and the first insulation member, the first limiting portion and the second limiting portion being configured to cooperatively clamp the end cover, the second insulation member and the first insulation member.

7. The battery cell according to any one of claims 1-4, characterized in that, The first insulation member is connected to the end cover and cooperatively defines an accommodation cavity with the end cover, at least a portion of the second insulation member being accommodated in the accommodation cavity.

8. The battery cell of any one of claims 1-4, wherein, The second insulation member is bonded to a surface of the end cover facing the electrode assembly.

9. The battery cell of any one of claims 1-4, wherein, The second insulation member comprises an insulating coating coated on a surface of the end cover facing the electrode assembly.

10. The battery cell of any one of claims 1-4, wherein, The second insulation member is made of polyimide, fluoroplastic, ceramic, asbestos or polyphenylene sulfide.

11. The battery cell of any one of claims 1-4, wherein, The first insulation member is made of polyethylene, polypropylene, polyester, polyoxymethylene, nylon, polyurethane or polycarbonate.

12. A battery device characterized by comprising: The battery cell as claimed in any one of claims 1-11.

13. An electrical device, comprising: The battery cell as claimed in any one of claims 1-11 or the battery device as claimed in claim 12, the battery cell being used to provide electrical energy to the electrical device.

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