Battery cell, battery device, and electric device

Abstract

The application provides a battery cell, a battery device and a power utilization device. The battery cell comprises a shell, an electrode assembly, a pressure relief mechanism, an insulating piece and a protective piece. The shell comprises a first wall. The electrode assembly is accommodated in the shell. The pressure relief mechanism is arranged on the first wall and is configured to release the internal pressure of the battery cell. The insulating piece is arranged outside the shell and covers at least part of the outer surface of the first wall. At least part of the protective piece is arranged between the first wall and the insulating piece, and a sealed space is formed between the protective piece and the pressure relief mechanism. In such a battery cell, the protective piece and the insulating piece can enhance the protection capability of the pressure relief mechanism, reduce the risk of the pressure relief mechanism being crushed, and the protective piece can form a sealed space with the pressure relief mechanism, reducing the risk of external liquid entering the sealed space and contacting the pressure relief mechanism to cause the pressure relief mechanism to fail, reducing the risk of the battery cell failing and prolonging the service life of the battery cell.

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. A battery device consists of individual battery cells, and the lifespan of these cells is a significant concern during their use. Therefore, extending the lifespan of individual battery cells is a pressing technical challenge in battery technology. Summary of the Invention

[0004] This application provides a battery cell, a battery device, and an electrical device that can extend the service life of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a pressure relief mechanism, an insulating member, and a protective member; the casing includes a first wall; the electrode assembly is housed within the casing; the pressure relief mechanism is disposed on the first wall and configured to release the internal pressure of the battery cell; the insulating member is disposed on the outer side of the casing and covers at least a portion of the outer surface of the first wall; at least a portion of the protective member is disposed between the first wall and the insulating member, and a sealed space is formed between the protective member and the pressure relief mechanism.

[0006] In the above technical solution, by placing the insulating component on the outside of the casing, the insulating component can insulate and protect the casing of the battery cell, reducing the risk of insulation failure of the battery cell. By placing at least a portion of the protective component between the pressure relief mechanism and the insulating component, a sealed space is formed between the protective component and the pressure relief mechanism. The protective component and the insulating component are stacked on the outside of the pressure relief mechanism, which can enhance the protection capability of the pressure relief mechanism, reduce the risk of the protective component and the insulating component being deformed by external liquid pressure and damaging the pressure relief mechanism. Furthermore, the sealed space formed between the protective component and the pressure relief mechanism can reduce the risk of external liquid entering the sealed space and contacting the pressure relief mechanism, thus reducing the risk of battery cell failure and extending the service life of the battery cell.

[0007] In some embodiments, the pressure relief mechanism has a first surface facing the protective member, the first surface having a groove, the protective member being connected to the first surface, and the groove wall surface and the protective member surface facing the pressure relief mechanism jointly defining a sealing space. By defining the sealing space together with the groove wall surface and the protective member surface facing the pressure relief mechanism, the sealing space can seal the groove wall surface, thereby reducing the risk of external pressure being transmitted to the groove wall surface, thus reducing the risk of pressure on the groove wall surface leading to damage to the pressure relief mechanism, thereby reducing the risk of battery cell failure and extending the battery cell's service life.

[0008] In some embodiments, the pressure relief mechanism has a first surface facing the protective member, the protective member being connected to the first surface to form a first connection area, the first connection area being disposed around the outside of the sealed space. Thus, the first connection area connects the protective member and the first surface, thereby isolating the sealed space from the external medium and reducing the risk of the external medium contacting and damaging the pressure relief mechanism.

[0009] In some embodiments, the protective element is bonded to the first surface. This reduces the difficulty of installing the protective element and, by bonding the protective element to the pressure relief mechanism, reduces the difficulty of the protective element detaching from the first surface when the pressure relief mechanism releases the internal pressure of the battery cell, thus facilitating the normal pressure relief of the pressure relief mechanism.

[0010] In some embodiments, the protective component has a through hole that penetrates the protective component and communicates with the sealed space, while an insulating component covers the through hole. By providing a through hole in the protective component, which communicates with the sealed space, the airtightness of the sealed space can be tested through the through hole, thereby testing the airtightness of the pressure relief mechanism. By covering the through hole with an insulating component, the risk of external media entering the sealed space through the through hole can be reduced, thereby reducing the risk of external media interfering with the pressure relief mechanism.

[0011] In some embodiments, the diameter of the through-hole is 0.5mm-1mm. When the diameter of the through-hole is greater than or equal to 0.5mm, the difficulty of airtightness testing of the pressure relief mechanism is reduced. When the diameter of the through-hole is less than or equal to 1mm, the risk of external medium contacting the pressure relief mechanism through the through-hole is reduced, thereby reducing the risk of pressure relief mechanism failure and improving the reliability of the battery cell. Therefore, when the diameter of the through-hole is 0.5mm-1mm, both the difficulty of airtightness testing of the pressure relief mechanism and the risk of external medium contacting the pressure relief mechanism through the through-hole can be reduced.

[0012] In some embodiments, the protective member has a second surface facing away from the pressure relief mechanism, and the insulating member covers the second surface. This enhances the restraint of the insulating member on the protective member, reduces the risk of the protective member detaching from the insulating member, and thus reduces the risk of seal failure of the sealed space.

[0013] In some embodiments, the thickness of the protective element is greater than the thickness of the insulating element. This allows the protective element to withstand greater pressure, and the protective element and insulating element are stacked on the outside of the pressure relief mechanism, thereby reducing the impact of external pressure on the pressure relief mechanism and extending its service life.

[0014] In some embodiments, the thickness of the protective component is 0.3mm-3mm. When the thickness of the protective component is greater than or equal to 0.3mm, the structural strength of the protective component can be improved, reducing the risk of damage to the protective component during normal battery use; when the thickness of the protective component is less than or equal to 3mm, the material used in the protective component can be reduced, the space occupied by the protective component can be reduced, and the volumetric energy density of the battery cell can be improved; therefore, when the thickness of the protective component is 0.3mm-3mm, both the structural strength of the protective component and the volumetric energy density of the battery cell can be balanced.

[0015] In some embodiments, the thickness of the protective component is 0.5mm-1.5mm. When the thickness of the protective component is greater than or equal to 0.5mm, the structural strength of the protective component can be further improved, reducing the risk of damage to the protective component during normal battery use. When the thickness of the protective component is less than or equal to 1.5mm, the material used in the protective component can be further reduced, the space occupied by the protective component can be further reduced, and the volumetric energy density of the battery cell can be improved. Therefore, when the thickness of the protective component is 0.5mm-1.5mm, both the structural strength of the protective component and the volumetric energy density of the battery cell can be further balanced.

[0016] In some embodiments, the melting point of the protective component is 120°C-200°C. When the melting point of the protective component is greater than or equal to 120°C, the risk of damage to the protective component during normal use of the battery cell can be reduced, improving the structural stability of the protective component. When the melting point of the protective component is less than or equal to 200°C, the protective component can be destroyed before the battery cell experiences thermal runaway, which is beneficial for the normal use of the pressure relief mechanism, reduces the risk of pressure relief mechanism failure, and improves the reliability of the battery cell. Therefore, when the melting point of the protective component is 120°C-200°C, it is possible to balance reducing the risk of damage to the protective component during normal use of the battery cell and reducing the risk of pressure relief mechanism failure.

[0017] In some embodiments, the protective component is made of at least one of polypropylene, polyethylene terephthalate, and polyhydroxybutyrate. This allows the protective component to maintain structural stability during normal use of the battery cell, reducing the impact of external media on the battery cell; and it also allows the protective component to be destroyed before the battery cell experiences thermal runaway, thereby facilitating the proper release of pressure by the pressure relief mechanism and improving the reliability of the battery cell.

[0018] In some embodiments, the pressure relief mechanism is separately disposed from and connected to the first wall. This reduces the processing difficulty of the pressure relief mechanism and the housing, and reduces the processing cost of the battery cell.

[0019] In some embodiments, the pressure relief mechanism is connected to the first wall to form a connection portion; the first wall has a third surface facing the insulating member, and the protective member is connected to the third surface to form a second connection area, which is disposed around the outside of the connection portion. In this way, the second connection area connects the protective member and the third surface, thereby sealing the protective member and the first wall, thus sealing the connection portion and reducing the risk of external media contacting the pressure relief mechanism and the connection portion and damaging the pressure relief mechanism.

[0020] In some embodiments, the protective element is bonded to the third surface. This reduces the difficulty of installing the protective element and, by bonding the protective element to the first wall, reduces the difficulty of the protective element detaching from the first wall when the pressure relief mechanism releases the internal pressure of the battery cell, thus facilitating the normal pressure relief of the pressure relief mechanism.

[0021] In some embodiments, in a projection plane perpendicular to the thickness direction of the first wall, the minimum distance between the outer edge of the orthographic projection of the protective member and the orthographic projection of the connecting portion is greater than or equal to 1 mm. This allows for a larger contact area between the protective member and the first wall, which helps to improve the sealing effect of the sealed space, thereby enhancing the protective effect of the protective member on the pressure relief mechanism.

[0022] In some embodiments, the pressure relief mechanism is integrally formed with the first wall. This reduces the difficulty and cost of installing the pressure relief mechanism.

[0023] In some embodiments, the pressure relief mechanism includes a weak portion configured to be at least partially destroyed when the internal pressure of the battery cell reaches a threshold; at least a portion of the orthographic projection of the weak portion lies within a sealed space along the thickness direction of the first wall. By ensuring that at least a portion of the orthographic projection of the weak portion lies within the sealed space, the risk of external media contacting the weak portion is reduced, the protective effect of the sealed space on the weak portion is improved, and the risk of pressure relief mechanism failure is reduced.

[0024] In some embodiments, the housing includes a shell and an end cap; the shell has an opening at at least one end along a first direction, and the shell includes a first wall extending to the opening at at least one end along the first direction; the end cap closes to the opening; wherein an insulating member circumferentially covers the outer surface of the shell along the opening. By providing an insulating member circumferentially covering the shell, the connection strength between the insulating member and the shell is improved, thereby improving the restraining effect of the insulating member and the shell on the protective member, and improving the positional stability of the insulating member and the protective member.

[0025] Secondly, embodiments of this application provide a battery device, including the battery cell provided in any one of the embodiments of the first aspect.

[0026] In some embodiments, the battery device further includes a housing, in which individual battery cells are housed. The housing contains coolant, at least a portion of each battery cell is immersed in the coolant, and at least a portion of the pressure relief mechanism is located below the surface of the coolant. By immersing at least a portion of the battery cells in the coolant, the heat dissipation effect of the battery cells can be improved, reducing the risk of thermal runaway. With at least a portion of the pressure relief mechanism located below the coolant surface, and a protective element covering the pressure relief mechanism, the protective element isolates the coolant from the pressure relief mechanism, reducing the risk of coolant contact with the pressure relief mechanism, thereby reducing the risk of damage to the pressure relief mechanism and improving the reliability of the battery cells.

[0027] In some embodiments, the battery device further includes a housing, in which individual battery cells are housed. The housing includes a support member located at the bottom of the individual battery cells and supporting them. A first wall is disposed toward the support member. This arrangement, with the pressure relief mechanism oriented toward the support member, reduces the impact on other components within the housing during pressure relief, thereby improving the reliability of the battery device.

[0028] In some embodiments, a venting channel is provided on the side of the support member facing the first wall, and at least a portion of the protective member is accommodated in the venting channel. The exhaust material discharged through the venting channel and pressure relief mechanism allows for smoother discharge of materials from the battery device, reducing the risk of excessive local pressure within the battery device and improving its reliability.

[0029] 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

[0030] 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.

[0031] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0032] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0033] Figure 3Exploded views of a single battery cell provided in some embodiments of this application;

[0034] Figure 4 Exploded views of a battery cell provided in some embodiments of this application;

[0035] Figure 5 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0036] Figure 6 for Figure 5 AA section view;

[0037] Figure 7 for Figure 6 A magnified view of a portion of region A in the middle;

[0038] Figure 8 This is a partial schematic diagram of a battery cell provided in some embodiments of this application;

[0039] Figure 9 A partial enlarged view of a battery cell provided in some embodiments of this application;

[0040] Figure 10 A partial schematic diagram of a battery cell provided for some embodiments of this application;

[0041] Figure 11 Exploded views of a battery device provided in some embodiments of this application;

[0042] Figure 12 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application.

[0043] Icons: 1-Outer shell; 11-Shell; 111-First wall; 1111-Third surface; 12-End cap;

[0044] 2-Electrode assembly; 21-Positive electrode tab; 22-Negative electrode tab; 3-Electrode terminal;

[0045] 4-Pressure relief mechanism; 41-Weak part; 42-Pressure relief area; 43-First surface; 431-Groove;

[0046] 5-Insulating components;

[0047] 6-Protective component; 61-Second surface; 62-Through hole;

[0048] 7-Sealed space;

[0049] 81 - First connection region; 82 - Second connection region;

[0050] 9-Connecting part;

[0051] 10 - Battery cell; 20 - Housing; 201 - First housing; 202 - Second housing; 203 - Supporting component; 31 - Exhaust channel; 30 - Coolant;

[0052] 100 - Battery device; 200 - Controller; 300 - Motor; 1000 - Vehicle; Z - Along the thickness direction of the first wall. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In this application, "multiple" means two or more (including two).

[0059] 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.

[0060] 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.

[0061] 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.

[0062] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0063] 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.

[0064] 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.).

[0065] 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 0.2 Mn 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.

[0066] 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.

[0067] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0068] 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.).

[0069] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0070] 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.

[0071] 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.

[0072] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0080] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0081] 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.

[0082] 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.

[0083] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0085] In some implementations, the electrode assembly is a stacked structure.

[0086] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0091] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0092] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0098] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cell assemblies housed within the housing.

[0099] 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.

[0100] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] The pressure relief mechanism on a battery cell has a significant impact on battery safety. For example, in the event of a short circuit or overcharging, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure or temperature. In such cases, the pressure relief mechanism can release the internal pressure and temperature to the outside, reducing the risk of battery cell explosion or fire.

[0106] To improve the insulation performance of individual battery cells, insulating components, such as a blue film, can be installed outside the cell's casing to cover both the casing and the pressure relief mechanism, reducing the risk of insulation failure. However, during battery cell use, because the insulating components are typically thin, they are prone to deformation or damage under external pressure, causing the external pressure to be transmitted to the pressure relief mechanism and affecting its lifespan. For example, immersing a battery cell in a cooling fluid can improve heat dissipation and increase heat exchange efficiency. However, because the cell is immersed in coolant, the insulating components are easily deformed or damaged by the hydraulic pressure. The external insulating components of the pressure relief mechanism, deformed under hydraulic pressure, can easily press against the mechanism, allowing the hydraulic pressure to be transmitted through them. Furthermore, if the external insulating components are damaged, the coolant can easily penetrate them and contact the pressure relief mechanism, potentially damaging it and affecting its lifespan, ultimately leading to battery cell failure and extending the battery's overall lifespan.

[0107] In view of this, in order to reduce the influence of external media on the pressure relief mechanism, embodiments of this application provide a battery cell, including a housing, an electrode assembly, a pressure relief mechanism, an insulating member, and a protective member. The housing includes a first wall. The electrode assembly is housed within the housing. The pressure relief mechanism is disposed on the first wall and configured to release the internal pressure of the battery cell. The insulating member is disposed on the outer side of the housing and covers at least a portion of the outer surface of the first wall. At least a portion of the protective member is disposed between the pressure relief mechanism and the insulating member, forming a sealed space between the protective member and the pressure relief mechanism.

[0108] In such a battery cell, by placing the insulating component on the outside of the casing, the insulating component can insulate and protect the battery cell casing, reducing the risk of insulation failure. By placing at least a portion of the protective component between the pressure relief mechanism and the insulating component, a sealed space is formed between the protective component and the pressure relief mechanism. This enhances the protection of the pressure relief mechanism, reducing the risk of the protective component and the insulating component being deformed by external liquid pressure and damaging the pressure relief mechanism. Furthermore, the sealed space between the protective component and the pressure relief mechanism reduces the risk of external liquid entering the sealed space and contacting the pressure relief mechanism, thus reducing the risk of battery cell failure and extending the battery cell's service life.

[0109] 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.

[0110] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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 receiving cavity.

[0116] 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.

[0117] 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.

[0118] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 10 provided in some embodiments of this application. The battery cell 10 may include a housing 1 and an electrode assembly 2, the electrode assembly 2 being housed within the housing 1.

[0119] In some embodiments, the housing 1 may include a housing 11 and an end cap 12, the housing 11 having an opening, and the end cap 12 closing the opening of the housing 11. Here, "closed" means covered or shut, and can be either sealed or unsealed.

[0120] The housing 11 is a component used to house the electrode assembly 2. The housing 11 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The housing 11 can have various shapes, such as cylindrical or cuboid. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 2 can be partially or completely housed within the housing 11.

[0121] The end cap 12 and the housing 11 together define a receiving space for accommodating the electrode assembly 2 and other components. The end cap 12 can be connected to the housing 11 by welding, rolling, or other methods to close the opening of the housing 11. The shape of the end cap 12 can be adapted to the shape of the housing 11. For example, if the housing 11 is a cuboid structure, the end cap 12 can be a rectangular plate structure adapted to the housing 11; or if the housing 11 is a cylindrical structure, the end cap 12 can be a circular plate structure adapted to the housing 11. The end cap 12 can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The end cap 12 and the housing 11 can be made of the same or different materials.

[0122] There can be one electrode assembly 2 or multiple electrode assemblies.

[0123] In an embodiment where the housing 11 has an opening at one end, one end cap 12 may be provided accordingly. In an embodiment where the housing 11 has openings at both opposite ends, two end caps 12 may be provided accordingly. The two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define the receiving space.

[0124] In some embodiments, the battery cell 10 further includes an insulating element 5, which may be a blue film. The insulating element 5 covers the outer surface of the housing 1 to improve the insulation and protection performance of the housing 1.

[0125] In some embodiments, the battery cell 10 further includes a pressure relief mechanism 4 disposed in the housing 1. The pressure relief mechanism 4 is actuated to release internal pressure or temperature when the internal pressure of the battery cell 10 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches the predetermined threshold, the pressure relief mechanism 4 performs an action or a weak structure provided in the pressure relief mechanism 4 is destroyed, thereby forming an opening or channel for releasing internal pressure or temperature.

[0126] The term "actuation" as used in this application refers to the pressure relief mechanism 4 being activated or reaching a certain state, thereby releasing the internal pressure and temperature of the battery cell 10. The actions of the pressure relief mechanism 4 may include, but are not limited to, at least a portion of the pressure relief mechanism 4 rupturing, breaking, tearing, or opening. When the pressure relief mechanism 4 is actuated, the high-temperature, high-pressure substances inside the battery cell 10 are discharged outwards from the actuated portion. This method allows for pressure and temperature relief of the battery cell 10 under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0127] The emissions from the battery cell 10 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0128] In some embodiments, the battery cell 10 may further include electrode terminals 3, which are disposed on the housing 1 and are used for electrical connection with the tabs of the electrode assembly 2 to input or output electrical energy of the battery cell 10. The electrode terminals 3 may be disposed on the housing 11 of the housing 1 or on the end cap 12 of the housing 1. The electrode terminals 3 and the tabs may be directly connected, for example, by welding the electrode terminals 3 to the tabs. Alternatively, the electrode terminals 3 and the tabs may be indirectly connected, for example, by a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0129] As an example, such as Figure 3As shown, the housing 11 has openings at both ends, and there are two end caps 12 in the housing 1, each end cap 12 closing one opening of the housing 11. Two electrode terminals 3 are provided on the end caps 12, which are a positive electrode terminal and a negative electrode terminal, respectively. The electrode assembly 2 has a positive electrode tab 21 and a negative electrode tab 22 formed at both ends facing the two end caps 12, respectively. The positive electrode terminal is electrically connected to the positive electrode tab 21, and the negative electrode terminal is electrically connected to the negative electrode tab 22.

[0130] Please refer to Figures 4-7 , Figure 4 Exploded views of a battery cell 10 provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of this application; Figure 6 for Figure 5 AA section view; Figure 7 for Figure 6 A partial enlarged view of region A. This application provides a battery cell 10, including a housing 1, an electrode assembly 2, a pressure relief mechanism 4, an insulating member 5, and a protective member 6. The housing 1 includes a first wall 111. The electrode assembly 2 is housed within the housing 1. The pressure relief mechanism 4 is disposed on the first wall 111 and configured to release internal pressure from the battery cell 10. The insulating member 5 is disposed on the outer side of the housing 1 and covers at least a portion of the outer surface of the first wall 111. At least a portion of the protective member 6 is disposed between the first wall 111 and the insulating member 5, and covers the pressure relief mechanism 4, forming a sealed space 7 between the protective member 6 and the pressure relief mechanism 4.

[0131] The housing 1 may include a housing 11 and an end cap 12. At least one wall of the housing 1 may be a first wall 111.

[0132] For example, the battery cell 10 is a cylindrical battery cell 10, one end of the casing 11 has an opening, and the end cap 12 covers the opening. The first wall 111 can be the end cap 12, or it can be the wall of the casing 11 extending to the opening, or it can be the wall of the casing 11 opposite to the opening.

[0133] For example, the battery cell 10 is a prismatic battery cell 10, with an opening at one end of the casing 11. An end cap 12 closes to the opening. The end cap 12 can be the first wall 111, or the wall opposite the end cap 12 can be the first wall 111, or at least one of the walls of the casing 11 extending to the opening can be the first wall 111. In embodiments where at least one of the walls of the casing 11 extending to the opening is the first wall 111, multiple walls of the casing 11 extending to the opening can be the first walls 111, each first wall 111 being provided with a pressure relief mechanism 4; alternatively, only one of the multiple walls of the casing 11 extending to the opening can be the first wall 111, with the pressure relief mechanism 4 disposed on the first wall 111. The pressure relief mechanism 4 disposed on the first wall 111 can be integrally formed with the first wall 111, or it can be separately disposed and connected to the first wall 111.

[0134] An insulating element 5 is disposed outside the housing 1 to insulate and protect the housing 1. The insulating element 5 may cover only a portion of the outer surface of the first wall 111; or it may cover the entire outer surface of the first wall 111. The insulating element 5 may cover only the outer surface of the first wall 111; it may also cover other outer surfaces of the housing 1. For example, if the housing 11 includes a first wall 111, the insulating element 5 is a blue membrane circumferentially covering the housing 11 along the opening of the housing 11, covering the outer surfaces of multiple sidewalls in the housing 11, one of which is the first wall 111.

[0135] The protective element 6 is located outside the housing 1. It can be that only a portion of the protective element 6 is located between the pressure relief mechanism 4 and the insulating element 5; or the entire protective element 6 is located between the pressure relief mechanism 4 and the insulating element 5. In embodiments where only a portion of the protective element 6 is located between the pressure relief mechanism 4 and the insulating element 5, another portion of the protective element 6 can be located between the first wall 111 and the insulating element 5; another portion of the protective element 6 can be located on the side of the first wall 111 facing away from the electrode assembly 2, and the insulating element 5 does not cover this portion of the protective element 6; or another portion of the protective element 6 can be located between the insulating element 5 and other walls of the housing 1 besides the first wall 111. The protective element 6 covers the pressure relief mechanism 4 such that, in the projection plane along the thickness direction Z of the first wall, the orthographic projection of the pressure relief mechanism 4 and the orthographic projection of the protective element 6 at least partially overlap; alternatively, the orthographic projection of the pressure relief mechanism 4 may be located within the outer contour of the orthographic projection of the protective element 6, and the area of ​​the orthographic projection of the pressure relief mechanism 4 is smaller than the area of ​​the orthographic projection of the protective element 6; alternatively, the orthographic projection of the protective element 6 may be located within the orthographic projection of the pressure relief mechanism 4, and the area of ​​the orthographic projection of the pressure relief mechanism 4 is larger than the area of ​​the orthographic projection of the protective element 6; alternatively, the outer contour of the orthographic projection of the pressure relief mechanism 4 may overlap with the outer contour of the orthographic projection of the protective element 6. The protective element 6 may abut against the first wall 111; alternatively, the protective element 6 may be connected to the first wall 111, for example, by bonding the protective element 6 to the first wall 111, or by thermally fusion bonding the protective element 6 to the first wall 111.

[0136] Alternatively, the surface of the protective element 6 facing the pressure relief mechanism 4 may have a recess, and the surface of the pressure relief mechanism 4 facing the protective element 6 may be flat, with the wall of the recess forming a sealed space 7 between the recess and the pressure relief mechanism 4; alternatively, the surface of the pressure relief mechanism 4 facing the protective element 6 may have a recess, and the surface of the protective element 6 facing the pressure relief mechanism 4 may be flat, with the wall of the recess forming a sealed space 7 between the recess and the protective element 6; or both the protective element 6 and the pressure relief mechanism 4 may have recesses, with the walls of the two recesses together forming a sealed space 7.

[0137] In this application, the sealed space 7 refers to a space where, when the battery cell 10 is immersed within 500 mm below the surface of the coolant 30, the coolant 30 cannot enter and fill the sealed space 7 within four hours. The sealed space 7 can be completely sealed from the space outside the battery cell 10.

[0138] In this battery cell 10, by placing the insulating member 5 on the outside of the outer casing 1, the insulating member 5 can insulate and protect the outer casing 1 of the battery cell 10, reducing the risk of insulation failure of the battery cell 10. By placing at least a portion of the protective member 6 between the pressure relief mechanism 4 and the insulating member 5, a sealed space 7 is formed between the protective member 6 and the pressure relief mechanism 4. The protective member 6 and the insulating member 5 are stacked on the outside of the pressure relief mechanism 4, which can enhance the protection capability of the pressure relief mechanism 4, reduce the risk of the protective member 6 and the insulating member 5 being deformed by external liquid pressure and crushing the pressure relief mechanism 4. Furthermore, the protective member 6 can form a sealed space 7 with the pressure relief mechanism 4, which can reduce the risk of external liquid entering the sealed space 7 and contacting the pressure relief mechanism 4, causing the pressure relief mechanism 4 to fail. This reduces the risk of battery cell 10 failure and extends the service life of the battery cell 10.

[0139] In some embodiments, the battery cell 10 is immersed in the coolant 30. The insulating member 5 and the protective member 6 can isolate the pressure relief mechanism 4 from the coolant 30. The sealed space 7 formed between the protective member 6 and the pressure relief mechanism 4 can reduce the risk of the pressure relief mechanism 4 failing due to the coolant 30 contacting the pressure relief mechanism 4. The stacked arrangement of the protective member 6 and the insulating member 5 can enhance the deformation resistance of the protective member 6 and the insulating member 5, thereby enhancing the protection capability of the pressure relief mechanism 4 and reducing the risk of the pressure relief mechanism 4 failing.

[0140] In some embodiments, please continue to refer to Figures 4-7 The pressure relief mechanism 4 has a first surface 43 facing the protective member 6. The first surface 43 is provided with a groove 431. The protective member 6 is connected to the first surface 43. The groove wall surface of the groove 431 and the surface of the protective member 6 facing the pressure relief mechanism 4 together define a sealing space 7.

[0141] The first surface 43 may have a groove 431; alternatively, the first surface 43 of the pressure relief mechanism 4 may be recessed in the direction away from the protective member 6, so as to form a protrusion on the surface of the pressure relief mechanism 4 away from the protective member 6, thereby forming the groove 431. It is understood that when the pressure relief mechanism 4 is normally depressurizing, at least a portion of the groove wall surface of the groove 431 is damaged to release the pressure of the battery cell 10.

[0142] By defining the sealing space 7 together with the groove wall surface of the groove 431 and the surface of the protective member 6 facing the pressure relief mechanism 4, the sealing space 7 can seal the groove wall surface of the groove 431, thereby reducing the risk of external pressure being transmitted to the groove wall surface of the groove 431, thereby reducing the risk of pressure relief mechanism 4 being damaged due to pressure on the groove wall surface of the groove 431, and thus reducing the risk of battery cell 10 failure and extending the service life of battery cell 10.

[0143] In some embodiments, please refer to Figure 8 , Figure 8 This is a partial schematic diagram of a battery cell 10 provided in some embodiments of this application. The pressure relief mechanism 4 has a first surface 43 facing the protective member 6, the protective member 6 being connected to the first surface 43 to form a first connection area 81, the first connection area 81 being disposed around the outside of the sealed space 7.

[0144] The first connection area 81 surrounds the outside of the sealed space 7, that is, the first connection area 81 is the area where the outer protective member 6 of the groove 431 connects with the first surface 43. It can be formed by heat fusion, bonding, or other methods to connect the protective member 6 with the first surface 43.

[0145] For example, such as Figure 8 As shown, Figure 8 The shaded area in the image represents the first connection region 81.

[0146] In this embodiment, the first connection area 81 connects the protective member 6 and the first surface 43, thereby isolating the sealed space 7 from the external medium and reducing the risk of the external medium contacting the pressure relief mechanism 4 and damaging the pressure relief mechanism 4.

[0147] In some embodiments, the protective member 6 is adhered to the first surface 43.

[0148] An adhesive layer is provided between the protective component 6 and the first surface 43 to bond the protective component 6 to the first surface 43. The adhesive layer may be a hot melt adhesive. The adhesive layer between the protective component 6 and the first surface 43 is located in the first connection area 81.

[0149] In this embodiment, on the one hand, the installation difficulty of the protective component 6 is reduced, and on the other hand, the protective component 6 and the pressure relief mechanism 4 are connected by adhesive bonding. When the pressure relief mechanism 4 releases the internal pressure of the battery cell 10, the difficulty of the protective component 6 detaching from the first surface 43 is reduced, which is conducive to the normal pressure relief of the pressure relief mechanism 4.

[0150] In some embodiments, please refer to Figure 9 , Figure 9 This is a partial enlarged view of a battery cell 10 provided in some embodiments of this application. The protective member 6 is provided with a through hole 62, which penetrates the protective member 6 along the thickness direction Z of the first wall. The through hole 62 communicates with the sealed space 7, and the insulating member 5 covers the through hole 62.

[0151] The through hole 62 communicates with the sealed space 7, and the insulating element 5 covers the through hole 62, thereby maintaining the seal of the sealed space 7. When the battery cell 10 is immersed in the coolant 30, the insulating element 5 and the protective element 6 jointly isolate the coolant 30 and the pressure relief mechanism 4, which can reduce the risk of the coolant 30 entering the sealed space 7 and damaging the pressure relief mechanism 4.

[0152] In this embodiment, by providing a through hole 62 on the protective member 6, which is connected to the sealed space 7, the airtightness of the sealed space 7 can be tested through the through hole 62, thereby testing the airtightness of the pressure relief mechanism 4; by providing an insulating member 5 to cover the through hole 62, the risk of external medium entering the sealed space 7 through the through hole 62 can be reduced, thereby reducing the risk of external medium interfering with the pressure relief mechanism 4.

[0153] In some embodiments, the diameter of the through hole 62 is 0.5mm-1mm.

[0154] The diameter of the through hole 62 can be any one of 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 1mm, or any value between two of them.

[0155] When the diameter of the through hole 62 is greater than or equal to 0.5 mm, the difficulty of airtightness testing of the pressure relief mechanism 4 is reduced. When the diameter of the through hole 62 is less than or equal to 1 mm, the risk of external medium contacting the pressure relief mechanism 4 through the through hole 62 is reduced, thereby reducing the risk of failure of the pressure relief mechanism 4 and improving the reliability of the battery cell 10. Therefore, when the diameter of the through hole 62 is 0.5 mm to 1 mm, both the difficulty of airtightness testing of the pressure relief mechanism 4 and the risk of external medium contacting the pressure relief mechanism 4 through the through hole 62 can be balanced.

[0156] In some embodiments, the protective member 6 has a second surface 61 facing away from the pressure relief mechanism 4, and the insulating member 5 covers the second surface 61.

[0157] Alternatively, the entire protective element 6 may be located on the side of the first wall 111 away from the pressure relief mechanism 4, with the insulating element 5 covering the second surface 61, so that the protective element 6 covers the entire protective element 6; or only a portion of the protective element 6 may be located on the side of the first wall 111 away from the pressure relief mechanism 4, with the insulating element 5 covering only the portion of the protective element 6 away from the pressure relief mechanism 4. The insulating element 5 may be attached to the second surface 61 to cover the second surface 61.

[0158] In this embodiment, the binding of the insulating member 5 to the protective member 6 can be enhanced, reducing the risk of the protective member 6 detaching from the insulating member 5, thereby reducing the risk of sealing failure of the sealed space 7.

[0159] In some embodiments, the thickness of the protective element 6 is greater than the thickness of the insulating element 5.

[0160] The thickness of the protective element 6 is the dimension of the protective element 6 along the thickness direction Z of the first wall, and the thickness of the insulating element 5 is the dimension of the insulating element 5 along the thickness direction Z of the first wall.

[0161] In this embodiment, the protective element 6 can withstand greater pressure, and the protective element 6 and the insulating element 5 are stacked on the outside of the pressure relief mechanism 4, thereby reducing the impact of external pressure on the pressure relief mechanism 4 and extending the service life of the pressure relief mechanism 4.

[0162] In some embodiments, the thickness of the protective element 6 is 0.3mm-3mm.

[0163] The thickness of the protective component 6 can be any one of the following values ​​or a range between any two: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, and 3mm.

[0164] When the thickness of the protective component 6 is greater than or equal to 0.3 mm, the structural strength of the protective component 6 can be improved, and the risk of the protective component 6 being damaged during normal battery use can be reduced. When the thickness of the protective component 6 is less than or equal to 3 mm, the material used in the protective component 6 can be reduced, the space occupied by the protective component 6 can be reduced, and the volumetric energy density of the battery cell 10 can be improved. Therefore, when the thickness of the protective component 6 is 0.3 mm to 3 mm, both the structural strength of the protective component 6 and the volumetric energy density of the battery cell 10 can be taken into account.

[0165] In some embodiments, the thickness of the protective element 6 is 0.5mm-1.5mm.

[0166] The thickness of the protective component 6 can be any one of the following values ​​or a range between any two: 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, and 1.5mm.

[0167] When the thickness of the protective component 6 is greater than or equal to 0.5 mm, the structural strength of the protective component 6 can be further improved, reducing the risk of damage to the protective component 6 during normal battery use. When the thickness of the protective component 6 is less than or equal to 1.5 mm, the material used in the protective component 6 can be further reduced, the space occupied by the protective component 6 can be further reduced, and the volumetric energy density of the battery cell 10 can be improved. Therefore, when the thickness of the protective component 6 is 0.5 mm to 1.5 mm, the structural strength of the protective component 6 and the volumetric energy density of the battery cell 10 can be further balanced.

[0168] In some embodiments, the melting point of the protective element 6 is 120°C-200°C.

[0169] The melting point of the protective component 6 can be a single point value or a range between 120℃ and 200℃. For example, if the material of the protective component 6 is polypropylene, the melting point of the protective component 6 is 160℃-170℃.

[0170] The melting point of the protective component 6 can be any one of the following values ​​or a range between any two: 120℃, 123℃, 125℃, 128℃, 130℃, 133℃, 135℃, 138℃, 140℃, 143℃, 145℃, 148℃, 150℃, 153℃, 155℃, 158℃, 160℃, 163℃, 165℃, 168℃, 170℃, 173℃, 175℃, 178℃, 180℃, 183℃, 185℃, 188℃, 190℃, 193℃, 195℃, 198℃, and 200℃.

[0171] When the melting point of the protective component 6 is greater than or equal to 120°C, the risk of damage to the protective component 6 during normal use of the battery cell 10 can be reduced, thus improving the structural stability of the protective component 6. When the melting point of the protective component 6 is less than or equal to 200°C, the protective component 6 can be destroyed before the battery cell 10 experiences thermal runaway, which is beneficial to the normal use of the pressure relief mechanism 4, reduces the risk of pressure relief mechanism 4 failure, and improves the reliability of the battery cell 10. Therefore, when the melting point of the protective component 6 is between 120°C and 200°C, it is possible to balance reducing the risk of damage to the protective component 6 during normal use of the battery cell 10 and reducing the risk of pressure relief mechanism 4 failure.

[0172] In some embodiments, the material of the protective element 6 includes at least one of polypropylene, polyethylene terephthalate, and polyhydroxybutyrate.

[0173] The material of the protective component 6 may be one of polypropylene, polyethylene terephthalate, and polyhydroxybutyrate; or the material of the protective component 6 may include two of polypropylene, polyethylene terephthalate, and polyhydroxybutyrate; or the material of the protective component 6 may include a combination of polypropylene, polyethylene terephthalate, and polyhydroxybutyrate.

[0174] In this embodiment, on the one hand, the protective component 6 can maintain structural stability when the battery cell 10 is in normal use, reducing the impact of external medium on the battery cell 10; on the other hand, the protective component 6 can be destroyed before the battery cell 10 thermally runs away, which is conducive to the normal pressure relief mechanism 4 and improves the reliability of the battery cell 10.

[0175] In some embodiments, the pressure relief mechanism 4 is separately disposed from and connected to the first wall 111.

[0176] The pressure relief mechanism 4 can be welded or bonded to the first wall 111.

[0177] In this embodiment, by setting the pressure relief mechanism 4 and the first wall 111 separately and connecting them, the processing difficulty of the pressure relief mechanism 4 and the outer shell 1 is reduced, and the processing cost of the battery cell 10 is reduced.

[0178] In some embodiments, please refer to Figure 7 and Figure 10 , Figure 10 This is a partial schematic diagram of a battery cell 10 provided in some embodiments of this application. The pressure relief mechanism 4 is connected to the first wall 111 to form a connecting portion 9; the first wall 111 has a third surface 1111 facing the insulating member 5, and the protective member 6 is connected to the third surface 1111 to form a second connecting area 82, which is disposed around the outside of the connecting portion 9.

[0179] The connecting part 9 can be a weld mark formed by welding the pressure relief mechanism 4 and the first wall 111.

[0180] The second connection area 82 surrounds the outside of the connection portion 9, that is, the second connection area 82 is the area where the outer protective member 6 of the pressure relief mechanism 4 is connected to the third surface 1111. The protective member 6 and the third surface 1111 can be heat-fused, bonded, or otherwise formed to create the second connection area 82.

[0181] In an embodiment where the first surface 43 and the protective member 6 form the first connection area 81, the protective member 6 and the third surface 1111 may also form the second connection area 82.

[0182] For example, such as Figure 10 As shown, Figure 10 The shaded area in the image represents the second connection region 82.

[0183] In this embodiment, the second connection area 82 connects the protective member 6 and the third surface 1111, thereby sealing the protective member 6 and the first wall 111, thus sealing the connection part 9 and reducing the risk of external medium contacting the pressure relief mechanism 4 and the connection part 9 and damaging the pressure relief mechanism 4.

[0184] In some embodiments, the protective member 6 is bonded to the third surface 1111.

[0185] An adhesive layer is provided between the protective element 6 and the third surface 1111 to bond the protective element 6 to the third surface 1111. The adhesive layer may be a hot melt adhesive. The adhesive layer between the protective element 6 and the third surface 1111 is located in the second connection area 82.

[0186] In this embodiment, on the one hand, the installation difficulty of the protective component 6 is reduced, and on the other hand, the protective component 6 and the first wall 111 are connected by adhesive. When the pressure relief mechanism 4 releases the internal pressure of the battery cell 10, the difficulty of the protective component 6 detaching from the first wall 111 is reduced, which is conducive to the normal pressure relief of the pressure relief mechanism 4.

[0187] In some embodiments, in a projection plane perpendicular to the thickness direction of the first wall 111, the minimum distance between the outer edge of the orthographic projection of the protective member 6 and the orthographic projection of the connecting portion 9 is greater than or equal to 1 mm.

[0188] In the projection plane perpendicular to the thickness direction of the first wall 111, the outer edge of the projection of the protective member 6 extends more than 1 mm beyond the projection of the connecting portion 9 to increase the overlap area between the first wall 111 and the protective member 6, making the connection between the first wall 111 and the protective member 6 more stable. The minimum distance between the outer edge of the projection of the connecting portion 9 and the projection of the protective member 6 can be 1 mm, 2 mm, 3 mm, etc. It is understood that in embodiments where the entire protective member 6 is located between the first wall 111 and the insulating member 5, in the projection plane perpendicular to the thickness direction of the first wall 111, the orthographic projection of the protective member 6 is located within the outer contour of the orthographic projection of the first wall 111.

[0189] In this embodiment, by setting the protective member 6 in a projection plane perpendicular to the thickness direction of the first wall 111, the minimum distance between the outer edge of the orthographic projection of the protective member 6 and the orthographic projection of the connecting part 9 is greater than or equal to 1 mm, so that the protective member 6 and the first wall 111 can have more contact area, which helps to improve the sealing effect of the sealing space 7, thereby improving the protective effect of the protective member 6 on the pressure relief mechanism 4.

[0190] In some embodiments, the pressure relief mechanism 4 is integrally formed with the first wall 111.

[0191] Scratches can be made on the surface of the first wall 111 to form a weak area of ​​the first wall 111, which is the pressure relief mechanism 4.

[0192] In this embodiment, the pressure relief mechanism 4 is integrally formed with the first wall 111, which reduces the difficulty of setting up the pressure relief mechanism 4 and reduces the setting cost of the pressure relief mechanism 4.

[0193] In some embodiments, please continue to refer to Figure 7 The pressure relief mechanism 4 includes a weak portion 41, which is configured to be at least partially destroyed when the internal pressure of the battery cell 10 reaches a threshold; at least a portion of the orthographic projection of the weak portion 41 is located within the sealed space 7 along the thickness direction Z of the first wall.

[0194] The weak part 41 is the area with a thinner thickness on the groove wall surface of the groove 431.

[0195] When the internal pressure of the battery cell 10 reaches a threshold, the weak portion 41, due to its weak structure, can be destroyed before the outer casing 1 of the battery cell 10, thereby releasing the internal pressure of the battery cell 10. The weak structure can be a groove on the outer casing 1, for example, the weak portion 41 is an annular groove provided on the first wall 111.

[0196] In this embodiment, by setting at least a portion of the orthographic projection of the weak part 41 to be located within the sealed space 7, the risk of external medium contacting the weak part 41 is reduced, the protective effect of the sealed space 7 on the weak part 41 is improved, and the risk of failure of the pressure relief mechanism 4 is reduced.

[0197] In some embodiments, the pressure relief mechanism 4 further includes a pressure relief area 42, a weak portion 41 and the pressure relief area 42 are integrally formed, the weak portion 41 is disposed around the outside of the pressure relief area 42, and the protective member 6 covers the pressure relief area 42.

[0198] The weak part 41 has a ring structure, and the pressure relief area 42 is the part within the ring structure of the weak part 41. When the pressure relief mechanism 4 releases pressure, the pressure relief mechanism 4 is destroyed at the location of the ring structure of the weak part 41, so that the pressure relief area 42 is separated from the first wall 111, thereby realizing the pressure relief of the battery cell 10.

[0199] In some embodiments, the housing 1 includes a housing 11 and an end cap 12. The housing 11 has an opening at at least one end along a first direction, and the housing 11 includes a first wall 111 extending to the opening at at least one end along the first direction. The end cap 12 closes to the opening. An insulating member 5 covers the outer surface of the housing 11 circumferentially along the opening.

[0200] The housing 11 may be open at one end or open at both opposite ends. The insulating member 5 may only cover the outer surface of the housing 11; or the insulating member 5 may cover the outer surface of the housing 11 and a portion of the outer surface of the end cap 12.

[0201] In an embodiment where the housing 11 is open at one end, the first wall 111 extends to the opening at one end along the first direction. In an embodiment where both ends are open, the first wall 111 may extend to one opening at only one end along the first direction; or the first wall 111 may extend to two openings at each end along the first direction.

[0202] As an example, the first direction is perpendicular to the thickness direction of the first wall 111.

[0203] In this embodiment, by setting the insulating element 5 to circumferentially cover the housing 11, the connection strength between the insulating element 5 and the housing 1 is improved, thereby improving the limiting effect of the insulating element 5 and the housing 1 on the protective element 6 and improving the positional stability of the insulating element 5 and the protective element 6.

[0204] This application provides a battery device 100, which includes a battery cell 10 provided in any of the above embodiments.

[0205] In some embodiments, please refer to Figure 11 and Figure 12 , Figure 11 Exploded view of a battery device 100 provided in some embodiments of this application; Figure 12 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 also includes a housing 20, in which a battery cell 10 is housed. The housing 20 contains a coolant 30, at least a portion of the battery cell 10 is immersed in the coolant 30, and at least a portion of the pressure relief mechanism 4 is located below the surface of the coolant 30.

[0206] The battery cell 10 may be completely immersed in the coolant 30; or only a portion of the battery cell 10 may be immersed in the coolant 30, with the other portion outside the coolant 30. In the embodiment where only a portion of the battery cell 10 is immersed in the coolant 30, the level of the coolant 30 may be higher than the pressure relief mechanism 4, so that both the pressure relief mechanism 4 and the protective element 6 are below the liquid level.

[0207] In this embodiment, by immersing at least a portion of the battery cell 10 in the coolant 30, the heat dissipation effect of the battery cell 10 can be improved, reducing the risk of thermal runaway of the battery cell 10. At least a portion of the pressure relief mechanism 4 is located below the surface of the coolant 30, and the protective member 6 covers the pressure relief mechanism 4. The protective member 6 can isolate the coolant 30 and the pressure relief mechanism 4, reducing the risk of the coolant 30 contacting the pressure relief mechanism 4, thereby reducing the risk of damage to the pressure relief mechanism 4 and improving the reliability of the battery cell 10.

[0208] In some embodiments, please continue to refer to Figure 11 and Figure 12 The battery device 100 also includes a housing 20, in which the battery cell 10 is housed. The housing 20 includes a support member 203, which is located at the bottom of the battery cell 10 and supports the battery cell 10. A first wall 111 is disposed toward the support member 203.

[0209] The battery device 100 can accommodate multiple battery cells 10. The number of support members 203 can be one or multiple. Each support member 203 can support only one battery cell 10, or each support member 203 can support multiple battery cells 10.

[0210] The first wall 111 is disposed toward the support member 203 such that the pressure relief mechanism 4 is disposed toward the support member 203.

[0211] In this embodiment, the pressure relief mechanism 4 is positioned toward the support component 203, which reduces the impact of the pressure relief mechanism 4 on other components inside the housing 20 when it releases pressure, thereby improving the reliability of the battery device 100.

[0212] In some embodiments, please continue to refer to Figure 11 and Figure 12 The support member 203 has an exhaust channel 31 on the side facing the first wall 111, and at least a portion of the protective member 6 is accommodated in the exhaust channel 31.

[0213] At least a portion of the protective element 6 is accommodated in the exhaust passage 31. It may be that only a portion of the protective element 6 is accommodated in the exhaust passage 31; or it may be that the entire protective element 6 is accommodated in the exhaust passage 31.

[0214] In this embodiment, the exhaust material discharged through the exhaust channel 31 and the pressure relief mechanism 4 makes the discharge of the exhaust material in the battery device 100 smoother, reduces the risk of excessive local pressure in the battery device 100, and improves the reliability of the battery device 100.

[0215] 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.

[0216] Please continue to refer to Figures 4-7 This application provides a battery cell 10, including a housing 1, an electrode assembly 2, a pressure relief mechanism 4, an insulating member 5, and a protective member 6. The housing 1 includes a shell 11 and an end cap 12. The shell 11 has an opening, and the end cap 12 closes to the opening. The shell 11 includes a first wall 111. The electrode assembly 2 is housed within the housing 1. The pressure relief mechanism 4 is separately disposed from and welded to the first wall 111; the pressure relief mechanism 4 is configured to release the internal pressure of the battery cell 10. The insulating member 5 covers the outer surface of the shell 11 circumferentially along the opening of the shell 11. The insulating member 5 covers the entire outer surface of the first wall 111. The protective member 6 is disposed between the first wall 111 and the insulating member 5, and covers the pressure relief mechanism 4. The protective member 6 is bonded to the first wall 111, forming a sealed space 7 between the protective member 6 and the pressure relief mechanism 4. The thickness of the protective member 6 is 0.5mm-1.5mm.

[0217] In this embodiment, by placing the insulating member 5 on the outside of the housing 1, the insulating member 5 can insulate and protect the housing 1 of the battery cell 10, reducing the risk of insulation failure of the battery cell 10. By placing at least a portion of the protective member 6 between the pressure relief mechanism 4 and the insulating member 5, a sealed space 7 is formed between the protective member 6 and the pressure relief mechanism 4. The protective member 6 and the insulating member 5 are stacked on the outside of the pressure relief mechanism 4, which can enhance the protection capability of the pressure relief mechanism 4, reduce the risk of the protective member 6 and the insulating member 5 being deformed by external liquid pressure and crushing the pressure relief mechanism 4. Furthermore, the sealed space 7 formed between the protective member 6 and the pressure relief mechanism 4 can reduce the risk of external liquid entering the sealed space 7 and contacting the pressure relief mechanism 4, causing the pressure relief mechanism 4 to fail, thereby reducing the risk of battery cell 10 failure and extending the service life of the battery cell 10. When the thickness of the protective component 6 is greater than or equal to 0.5 mm, the structural strength of the protective component 6 can be further improved, reducing the risk of damage to the protective component 6 during normal battery use. When the thickness of the protective component 6 is less than or equal to 1.5 mm, the material used in the protective component 6 can be further reduced, the space occupied by the protective component 6 can be further reduced, and the volumetric energy density of the battery cell 10 can be improved. Therefore, when the thickness of the protective component 6 is 0.3 mm to 3 mm, the structural strength of the protective component 6 and the volumetric energy density of the battery cell 10 can be further balanced.

[0218] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0219] 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 in that, include: The outer shell, including the first wall; Electrode assembly, housed within the housing; A pressure relief mechanism is disposed on the first wall, and the pressure relief mechanism is configured to release the internal pressure of the battery cell. An insulating element is disposed on the outside of the housing and covers at least a portion of the outer surface of the first wall; A protective element is at least partially disposed between the pressure relief mechanism and the insulating element, and a sealed space is formed between the protective element and the pressure relief mechanism.

2. The battery cell as described in claim 1, characterized in that, The pressure relief mechanism has a first surface facing the protective member, the first surface is provided with a groove, the protective member is connected to the first surface, and the groove wall surface and the surface of the protective member facing the pressure relief mechanism together define the sealing space.

3. The battery cell as described in claim 1, characterized in that, The pressure relief mechanism has a first surface facing the protective member, the protective member being connected to the first surface to form a first connection area, the first connection area being disposed around the outside of the sealed space.

4. The battery cell as described in claim 3, characterized in that, The protective component is bonded to the first surface.

5. The battery cell as described in claim 1, characterized in that, The protective component is provided with a through hole that penetrates the protective component and communicates with the sealed space. The insulating component covers the through hole.

6. The battery cell as described in claim 5, characterized in that, The diameter of the through hole is 0.5mm-1mm.

7. The battery cell as described in claim 1, characterized in that, The protective element has a second surface facing away from the pressure relief mechanism, and the insulating element covers the second surface.

8. The battery cell as described in claim 1, characterized in that, The thickness of the protective component is greater than the thickness of the insulating component.

9. The battery cell as described in claim 1, characterized in that, The thickness of the protective component is 0.3mm-3mm.

10. The battery cell as described in claim 9, characterized in that, The thickness of the protective component is 0.5mm-1.5mm.

11. The battery cell as described in claim 1, characterized in that, The melting point of the protective component is 120℃-200℃.

12. The battery cell as described in claim 1, characterized in that, The material of the protective component includes at least one of polypropylene, polyethylene terephthalate, and polyhydroxybutyrate.

13. The battery cell according to any one of claims 1-12, characterized in that, The pressure relief mechanism is separately configured and connected to the first wall.

14. The battery cell as described in claim 13, characterized in that, The pressure relief mechanism is connected to the first wall to form a connection portion; the first wall has a third surface facing the insulating member, the protective member is connected to the third surface and forms a second connection area, the second connection area is disposed around the outside of the connection portion.

15. The battery cell as described in claim 14, characterized in that, The protective component is bonded to the third surface.

16. The battery cell as described in claim 14, characterized in that, In a projection plane perpendicular to the thickness direction of the first wall, the minimum distance between the outer edge of the orthographic projection of the protective member and the orthographic projection of the connecting part is greater than or equal to 1 mm.

17. The battery cell according to any one of claims 1-12, characterized in that, The pressure relief mechanism is integrally formed with the first wall.

18. The battery cell according to any one of claims 1-12, characterized in that, The pressure relief mechanism includes a weak portion, which is configured to be at least partially destroyed when the internal pressure of the battery cell reaches a threshold. At least a portion of the orthographic projection of the weak portion lies within the sealed space along the thickness direction of the first wall.

19. The battery cell according to any one of claims 1-12, characterized in that, The outer casing includes: A housing having an opening at at least one end along a first direction, the housing including a first wall extending to the opening at at least one end along the first direction; End cap, which closes the opening; The insulating element covers the outer surface of the housing along the circumference of the opening.

20. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-19.

21. The battery device as claimed in claim 20, characterized in that, The battery device further includes a housing, in which the battery cells are housed, and the housing contains coolant. At least a portion of the battery cells is immersed in the coolant, and at least a portion of the pressure relief mechanism is located below the surface of the coolant.

22. The battery device as claimed in claim 20 or 21, characterized in that, The battery device further includes a housing, in which the battery cells are housed. The housing includes a support member located at the bottom of the battery cells and supporting the battery cells. The first wall is disposed toward the support member.

23. The battery device as claimed in claim 22, characterized in that, The support member has an exhaust channel on the side facing the first wall, and at least a portion of the protective member is accommodated within the exhaust channel.

24. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-19 or a battery device as described in any one of claims 20-23, wherein the battery cell is used to provide electrical energy to the electrical device.

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