Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, the shell has a containing cavity for containing an electrode assembly, the shell comprises an end cover and a shell body, the shell body comprises two first walls oppositely arranged along a first direction and two second walls oppositely arranged along a second direction, the first direction is perpendicular to the second direction, the area of the first wall is greater than or equal to the area of the second wall, the first wall comprises a first support layer and a first high-temperature-resistant layer which are stacked along the first direction, and the melting point T of the material of the first high-temperature-resistant layer is 661 DEG C <= T <= 2100 DEG C. The technical scheme can reduce the risk of melting and deformation of the shell of the battery monomer, and improve the stability of the battery monomer in the operation process.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, and power tools.

[0003] The development of battery technology must take into account multiple design factors. Improving the stability of individual battery cells during operation is a research direction in the battery field. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can reduce the risk of battery cell casing deformation and melting, and improve the stability of battery cell during operation.

[0005] In a first aspect, this application provides a battery cell including a housing having a receiving cavity for accommodating an electrode assembly. The housing includes an end cap and a shell. The shell includes two first walls disposed opposite each other along a first direction and two second walls disposed opposite each other along a second direction. The first direction is perpendicular to the second direction. The area of ​​the first wall is greater than or equal to the area of ​​the second wall. The first wall includes a first support layer and a first high-temperature resistant layer stacked along the first direction. The melting point T of the material of the first high-temperature resistant layer is: 661℃≤T≤2100℃.

[0006] In the technical solution of this application embodiment, the outer casing is used to house the electrode assembly, providing a stable environment for the operation of the electrode assembly. The first wall of the outer casing includes a first support layer to improve the overall structural strength of the outer casing. The first wall includes a first high-temperature resistant layer, which can withstand temperatures above 661°C, maintaining its shape even when the temperature of the battery cell rises. The first wall is the side with the largest area of ​​the outer casing; the integrity of its shape improves the structural and shape integrity of the entire casing, reduces the risk of deformation and breakage, and improves the operational stability of the battery cell.

[0007] In some embodiments, the material density ρ of the first support layer is 1700 kg / m³. 3 ≤ρ≤4800Kg / m 3 In the above technical solution, the material density of the first support layer is low, which can reduce the weight of the first support layer, thereby reducing the weight of the outer casing and increasing the energy density of the battery cell.

[0008] In some embodiments, the first support layer includes at least one of an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, and a titanium alloy layer. These materials have low density, high structural strength, and are easy to obtain and mold, making them excellent raw materials for casings.

[0009] In some embodiments, the first high-temperature resistant layer includes at least one of a steel layer, a stainless steel layer, a carbon steel layer, and a ceramic layer. The aforementioned materials possess good high-temperature resistance, corrosion resistance, and a certain structural strength, enabling them to maintain the original structure of the outer casing under high-temperature conditions and reducing the risk of deformation or breakage of the battery cells during operation.

[0010] In some embodiments, the first support layer and the first high-temperature resistant layer are connected by die casting, or by casting. The above technical solution improves the connection strength between the first support layer and the first high-temperature resistant layer, and enhances the overall structural strength and manufacturing efficiency of the casing.

[0011] In some embodiments, the first support layer is disposed on the side of the first high-temperature resistant layer facing the receiving cavity. In the above structure, the first high-temperature resistant layer is disposed outside the first support layer, so even if the first support layer melts and deforms, it will not damage other components around the battery cell, further improving the operational stability of the battery cell.

[0012] In some embodiments, the first wall further includes a second support layer disposed on the side of the first high-temperature resistant layer opposite to the first support layer. The above structure, by providing the second support layer, improves the structural strength of the casing and enhances the protective performance of the battery cells.

[0013] In some embodiments, the second wall includes a third support layer and a second high-temperature resistant layer stacked along a second direction. In the above structure, the second wall also includes a high-temperature resistant layer, which further improves the high-temperature resistance of the casing and enhances the stability of the battery cell during operation.

[0014] In some embodiments, the second wall further includes a fourth support layer disposed on the side of the second high-temperature resistant layer opposite to the third support layer. In the above structure, by providing the fourth support layer, the structural strength of the casing is improved, and the protection performance of the battery cells is enhanced.

[0015] In some embodiments, the third support layer is interconnected with the first support layer. This structure improves the structural strength of both the third and first support layers, thereby enhancing the operational stability of the battery cell.

[0016] In some embodiments, the third support layer and the first support layer are integrally formed. The above technical solution improves the manufacturing efficiency of the outer casing.

[0017] In some embodiments, the second high-temperature resistant layer is interconnected with the first high-temperature resistant layer. This structure improves the structural strength of the second and first high-temperature resistant layers, thereby enhancing the high-temperature resistance of the battery cell.

[0018] In some embodiments, the second high-temperature resistant layer and the first high-temperature resistant layer are integrally formed. The above technical solution improves the manufacturing efficiency of the outer casing.

[0019] In some embodiments, along the first direction, the thickness of the first support layer is D1, and the thickness of the first high-temperature resistant layer is H1, where H1 < D1. In the above technical solution, the thickness of the first support layer is greater than the thickness of the first high-temperature resistant layer, thereby reducing the total weight of the battery cell and increasing the energy density of the battery cell.

[0020] In some embodiments, D1 and H1 satisfy the relationship: 1 / 3 ≤ H1 / D1 ≤ 1 / 5. The above structure, by setting the thickness of the first high-temperature resistant layer within a suitable range, can improve the high-temperature resistance and energy density of the battery cell.

[0021] In some embodiments, along the second direction, the thickness of the third support layer is D3, and the thickness of the second high-temperature resistant layer is H2, where H2 < D3. In the above technical solution, by setting the thickness of the third support layer to be greater than the thickness of the second high-temperature resistant layer, the total weight of the battery cell is reduced, and the energy density of the battery cell is increased.

[0022] In some embodiments, D3 and H2 satisfy the relationship: 1 / 4 ≤ H2 / D3 ≤ 1 / 6. The above structure, by setting the thickness of the second high-temperature resistant layer within a suitable range, can improve the high-temperature resistance and energy density of the battery cell.

[0023] In some embodiments, the housing further includes a third wall disposed opposite to the end cap. The third wall includes a fifth support layer and a third high-temperature resistant layer stacked along a third direction, the third direction being perpendicular to both the first and second directions. In the above structure, the high-temperature resistant layer disposed on the bottom wall of the housing improves the high-temperature resistance of the bottom of the housing, enhances the overall structural strength of the casing, and thus improves the operational stability of the battery cell.

[0024] In some embodiments, the third wall further includes a sixth support layer disposed on the side of the third high-temperature resistant layer opposite to the fifth support layer. The above structure further improves the structural strength of the third wall, reduces its weight, and increases the energy density of the battery cell.

[0025] In some embodiments, along the third direction, the thickness of the fifth support layer is D5, and the thickness of the third high-temperature resistant layer is H3, where H3 < D5. The above structure, by setting the thickness of the fifth support layer to be greater than the thickness of the third high-temperature resistant layer, reduces the total weight of the battery cell and increases its energy density.

[0026] In some embodiments, D5 and H3 satisfy the relationship: 1 / 4 ≤ H3 / D5 ≤ 1 / 6. The above structure, by setting the thickness of the third high-temperature resistant layer within a suitable range, can improve the high-temperature resistance and energy density of the battery cell.

[0027] In some embodiments, D1, D3, and D5 satisfy the relationship: D1≤D3≤D5. The above structure, with different thicknesses depending on the area of ​​the side surfaces of the casing, has a smaller thickness on larger surfaces and a larger thickness on smaller surfaces. This reduces the overall thickness of the support layer while maintaining support strength, thereby increasing the energy density of the individual battery cells.

[0028] In some embodiments, H1, H2, and H3 satisfy the relationship: H3≤H2≤H1. The above structure, with a thicker high-temperature resistant layer on the larger side, effectively improves the high-temperature resistance of the casing and enhances the operational stability of the battery cells.

[0029] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0030] Thirdly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0033] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0034] Figure 2 Explosion-proof diagrams of battery devices provided in some embodiments of this application;

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

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

[0037] Figure 5 This is a schematic diagram of the casing of a battery cell provided in other embodiments of this application;

[0038] Figure 6 This is a schematic diagram of the casing of a battery cell provided in other embodiments of this application;

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

[0040] Figure 8 A schematic cross-sectional view of the casing of a battery cell provided in some embodiments of this application;

[0041] Figure 9 This is a schematic diagram of the casing of a battery cell provided in other embodiments of this application;

[0042] Figure 10 This is a cross-sectional structural diagram of the casing of a battery cell provided in some other embodiments of this application.

[0043] Detailed Explanation of Reference Numerals

[0044] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 6. Battery cell; 10. Electrode assembly; 20. Housing; 201. First wall; 202. Second wall; 203. First support layer; 204. First high-temperature resistant layer; 205. Second support layer; 206. Third support layer; 207. Second high-temperature resistant layer; 208. Fourth support layer; 209. Fifth support layer; 210. Third high-temperature resistant layer; 30. End cap; 40. Outer shell; 50. Electrode terminal; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0045] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0051] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] 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.

[0054] 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.

[0055] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-95°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0056] In this application, "multiple" means two or more (including two).

[0057] 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.

[0058] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0059] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0060] 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.

[0061] 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.

[0062] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0063] 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 battery positive electrode active materials 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 / 3 Mn 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) 0.8 Co 0.15 Al0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0064] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0065] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] 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.

[0067] 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.

[0068] 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 for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0069] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0070] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0071] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0072] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0073] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0074] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[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. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0077] Liquid electrolytes include electrolyte salts and solvents.

[0078] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0079] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0080] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0081] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0082] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0083] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0084] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0085] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0086] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0087] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0088] In some implementations, the electrode assembly is a stacked structure.

[0089] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0090] 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.

[0091] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0092] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0093] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0094] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0095] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0096] In some embodiments, a battery cell may include a casing. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0097] As an example, the 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 batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0098] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0099] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0100] During operation, the temperature of a single battery cell can rise rapidly due to factors such as exothermic electrochemical reactions, prolonged charging time, and excessive current. Under high temperatures, the cell's casing is prone to deformation and cracking.

[0101] In view of this, this application provides a battery cell with a casing for housing electrode components, providing a stable environment for the operation of the electrode components. The first wall of the casing includes a first support layer to improve the overall structural strength of the casing. The first wall includes a first high-temperature resistant layer capable of withstanding temperatures above 661°C, maintaining its shape even when the battery cell temperature rises. The first wall is the side with the largest area of ​​the casing; the integrity of its shape improves the overall structural and shape integrity of the casing, reduces the risk of deformation and breakage, and enhances the operational stability of the battery cell.

[0102] 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.

[0103] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0104] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0105] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0106] 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.

[0107] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0108] 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.

[0109] 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.

[0110] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0111] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0112] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0113] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0114] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0115] like Figure 1 As shown, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0116] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0117] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0118] Figure 2 This is a schematic diagram of a battery explosion provided for some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 6, with the battery cells 6 housed within the housing 5. The battery cell 6 can be the smallest unit that makes up a battery.

[0119] The housing 5 is used to house the battery cell 6, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 6. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0120] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0121] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0122] In the battery device 2, there can be one or more battery cells 6. If there are multiple battery cells 6, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0123] Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the whole composed of multiple battery cells 6 can be housed in the housing 5; of course, multiple battery cells 6 can also be connected in series, parallel, or in a mixed manner to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a mixed manner to form a whole, and housed in the housing 5.

[0124] Please refer to the reference. Figures 3 to 4 , Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. Figure 4 This is a schematic diagram of the casing of a battery cell provided in some embodiments of this application.

[0125] As shown in the figure, this application embodiment provides a battery cell 6, including a housing 40, which has a receiving cavity for accommodating an electrode assembly 10. The housing 40 includes an end cap 30 and a shell 20. The shell 20 includes two first walls 201 disposed opposite each other along a first direction X, and two second walls 202 disposed opposite each other along a second direction Y. The first direction X is perpendicular to the second direction Y. The area of ​​the first wall 201 is greater than or equal to the area of ​​the second wall 202. The first wall 201 includes a first support layer 203 and a first high-temperature resistant layer 204 stacked along the first direction X. The melting point T of the material of the first high-temperature resistant layer 204 is: 661℃≤T≤2100℃.

[0126] For example, the housing 20 is hexagonal, having a top wall and a bottom wall opposite each other, two first side walls opposite each other, and two second side walls opposite each other. The top wall and bottom wall have equal and smaller areas. The areas of the first and second side walls are both larger than the bottom and top walls. The areas of the two first side walls are equal, and the areas of the two second side walls are also equal. The area of ​​the first side wall is larger than the second side wall; therefore, the first side wall is the largest, 201. Furthermore, the second side wall can be 202, or both the top and bottom walls can be 202. The first direction X can be the thickness direction of the battery cell 6, and the second direction Y can be the width or height direction of the battery cell 6.

[0127] The melting point of the first high-temperature resistant layer 204 is usually greater than that of the first support layer 203, so as to maintain the original structure and shape even if the battery cell 6 experiences thermal runaway, so as to contain and confine the material inside the battery cell 6, reduce the damage to other batteries caused by the thermal runaway battery cell 6 breaking or deforming.

[0128] In the technical solution of this application embodiment, the outer shell 40 is used to house the electrode assembly 10, providing a stable environment for the operation of the electrode assembly 10. The first wall 201 of the outer shell 40 includes a first support layer 203, which improves the overall structural strength of the outer shell 40. The first wall 201 includes a first high-temperature resistant layer 204, which can withstand temperatures above 661°C, maintaining the shape of the first wall 201 even when the temperature of the battery cell 6 rises. The first wall 201 is the side with the largest area of ​​the outer shell 40. The integrity of the shape of the first wall 201 improves the structural and shape integrity of the entire shell 20, reduces the risk of deformation and breakage of the shell 20, and improves the operational stability of the battery cell 6.

[0129] In some embodiments of this application, the material density ρ of the first support layer 203 is 1700 kg / m³. 3 ≤ρ≤4800Kg / m 3 .

[0130] The material density of the first support layer 203 refers to the density of the primary material used to manufacture the first support layer 203. Compared to high-density materials, when the material density ρ of the first support layer 203 is 1700 kg / m³... 3 Up to 4800Kg / m 3 When within the range, it can reduce the weight of the first support layer 203, thereby reducing the weight of the casing 40 and increasing the energy density of the battery cell 6.

[0131] In some embodiments of this application, the first support layer 203 includes at least one of an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, and a titanium alloy layer.

[0132] Aluminum is a lightweight metal with a density of approximately 2700 kg / m³. 3 Aluminum has good ductility and malleability, making it easy to process into various shapes. While having a low density, aluminum has relatively high strength, allowing it to withstand certain pressure and impacts. Aluminum also exhibits good corrosion resistance, showing good tolerance to electrolytes and substances produced by electrochemical reactions, ensuring the structural stability of the battery cell during operation.

[0133] Aluminum alloys are formed by adding other elements, such as copper, magnesium, and zinc, to aluminum. The density of aluminum alloys typically ranges from 2600 kg / m³. 3 Up to 2900Kg / m 3 Between these two types of aluminum alloys, aluminum alloys generally have higher strength and hardness than pure aluminum, while maintaining a lower density. Aluminum alloys also possess superior corrosion resistance, heat resistance, and fatigue resistance compared to pure aluminum. Aluminum alloys are easy to process and weld, making them suitable for complex enclosure structures.

[0134] Magnesium alloys are another lightweight, high-strength material, with a density even lower than that of aluminum. The density of magnesium alloys typically ranges from 1740 kg / m³. 3 Up to 1850Kg / m 3 Magnesium alloys exhibit good shock absorption and electromagnetic shielding properties. While their corrosion resistance is relatively poor, this can be improved through surface treatments such as anodizing. Magnesium alloys also possess excellent casting and machinability.

[0135] Titanium alloys are formed by adding other elements to titanium. The density of titanium alloys typically ranges from 4400 kg / m³. 3 Up to 4800Kg / m 3 Titanium alloys are high-strength, low-density, and corrosion-resistant alloy materials. They possess extremely high strength and hardness, enabling them to withstand extreme environments and conditions. Furthermore, titanium alloys exhibit superior corrosion resistance, heat resistance, and fatigue resistance compared to other metals.

[0136] The aforementioned materials have low density, high structural strength, and are easy to obtain and mold, making them one of the good raw materials for shell 40.

[0137] In some embodiments of this application, the first high-temperature resistant layer 204 includes at least one of a steel layer, a stainless steel layer, a carbon steel layer, and a ceramic layer.

[0138] Steel has a melting point T of around 1500℃. It is a commonly used structural material with good mechanical strength and certain high-temperature resistance. Using a steel layer as the first high-temperature resistant layer 204 in the outer shell 40 not only provides necessary structural support but also reduces deformation caused by high temperatures.

[0139] Stainless steel has a melting point (T) between 1400℃ and 1550℃ and is widely used due to its excellent corrosion resistance and high-temperature stability. A 204 stainless steel layer, as the first high-temperature resistant layer, further enhances the overall corrosion resistance while maintaining structural stability at high temperatures.

[0140] Carbon steel has a melting point T of 1400℃ to 1500℃. Carbon steel generally has higher strength and hardness than pure steel, while its cost is relatively low.

[0141] Ceramic materials have a melting point T of 2000℃ to 2100℃ and are known for their extremely high temperature resistance and chemical stability. The ceramic layer, as the first high-temperature resistant layer (204), can significantly improve the overall high-temperature resistance and effectively isolate the direct impact of the high-temperature environment on the internal battery structure.

[0142] The aforementioned materials have good high-temperature resistance, corrosion resistance, and certain structural strength. They can maintain the original structure of the outer shell 40 in high-temperature environments, reducing the risk of deformation or breakage of the battery cell 6 during operation.

[0143] In some embodiments of this application, the first support layer 203 and the first high-temperature resistant layer 204 are connected by die casting, or the first support layer 203 and the first high-temperature resistant layer 204 are formed by casting.

[0144] Die casting is a material processing technology that uses high pressure and high speed to fill a mold with molten material, which then crystallizes and solidifies under this high-pressure environment to form the desired casting. Die casting is characterized by high production efficiency, complex casting shapes, and high precision. When connecting the first support layer 203 and the first high-temperature resistant layer 204, die casting ensures a tight bond between the two layers, thereby improving the connection strength. Furthermore, die casting can be automated, further improving manufacturing efficiency.

[0145] Die casting is a metal processing technique that uses high pressure and high speed to fill a mold with molten metal, which then crystallizes and solidifies under this high-pressure environment to form the desired casting. Die casting is characterized by high production efficiency, complex casting shapes, and high precision. When connecting the first support layer 203 and the first high-temperature resistant layer 204, die casting ensures a tight bond between the two layers, thereby improving the connection strength. Furthermore, die casting can be automated, further improving manufacturing efficiency.

[0146] In some embodiments of this application, the first support layer 203 is disposed on the side of the first high-temperature resistant layer 204 facing the receiving cavity.

[0147] The first high-temperature resistant layer 204 is disposed on the outside of the first support layer 203, which can effectively isolate the high-temperature environment from the inside of the battery cell 6. When the battery cell 6 operates in a high-temperature environment, the first high-temperature resistant layer 204 can withstand the high temperature and prevent heat from being directly transferred to the first support layer 203 and other components.

[0148] The first support layer 203, as part of the internal structure of the battery cell 6, plays a supporting and fixing role. Even if the first support layer 203 melts or deforms under high temperature conditions, it will not directly damage other components around the battery cell 6 because it is isolated by the first high temperature resistant layer 204.

[0149] The above structure further improves the operational stability of battery cell 6.

[0150] like Figure 5 As shown, in some embodiments of this application, the first wall 201 further includes a second support layer 205 disposed on the side of the first high-temperature resistant layer 204 away from the first support layer 203.

[0151] The presence of the first support layer 203 and the second support layer 205 provides dual support for the battery cell 6. This design enhances the overall structural strength of the casing 40 while also improving the stability of the battery cell 6 under external impact or vibration. The addition of the second support layer 205 significantly improves the durability of the casing 40. This allows the casing 40 to better distribute and withstand pressure, thereby improving the pressure resistance of the battery cell 6. This is particularly important for battery cells 6 in applications such as electric vehicles and energy storage systems, as they frequently need to withstand various pressures from vehicle 1 operation or system operation.

[0152] Although the second support layer 205 itself may not directly possess high-temperature resistance, its combined use with the first high-temperature resistant layer 204 can further enhance the thermal stability of the casing 40. When the battery cell 6 operates at high temperatures, the first high-temperature resistant layer 204 can effectively isolate heat, while the second support layer 205 provides additional structural support to prevent the casing 40 from deforming or being damaged due to high temperatures.

[0153] The above-described structure, by setting the second support layer 205, improves the structural strength of the outer shell 40 and enhances the protective performance of the battery cell 6.

[0154] like Figure 6 As shown, in some embodiments of this application, the second wall 202 includes a third support layer 206 and a second high-temperature resistant layer 207 stacked along the second direction Y.

[0155] The second wall 202 also contains a high-temperature resistant layer, which effectively isolates the high-temperature environment from the internal structure of the battery cell 6, preventing performance degradation or damage caused by heat transfer. Under high-temperature operating conditions, the second high-temperature resistant layer 207 maintains structural stability and integrity, thereby extending the service life of the battery cell 6.

[0156] like Figure 7 As shown, in some embodiments of this application, the second wall 202 further includes a fourth support layer 208 disposed on the side of the second high-temperature resistant layer 207 away from the third support layer 206.

[0157] The presence of the third support layer 206 and the second support layer 205 provides dual support for the battery cell 6, improving its stability under external impact or vibration. The addition of a fourth support layer 208 allows the outer casing 40 to better distribute and withstand pressure, thereby improving the pressure resistance of the battery cell 6. Although the fourth support layer 208 itself may not directly possess high-temperature resistance, its combined use with the second high-temperature resistant layer 207 further enhances the thermal stability of the outer casing 40. When the battery cell 6 operates at high temperatures, the second high-temperature resistant layer 207 effectively isolates heat, while the fourth support layer 208 provides additional structural support, preventing the outer casing 40 from deforming or being damaged due to high temperatures.

[0158] In the above structure, by setting the fourth support layer 208, the structural strength of the outer shell 40 is improved and the protection performance of the battery cell 6 is enhanced.

[0159] In some embodiments of this application, the third support layer 206 is interconnected with the first support layer 203. The connection between the third support layer 206 and the first support layer 203 connects the first wall 201 and the second wall 202, forming a more complete support system. This design allows the outer casing 40 to better disperse and withstand external forces, thereby improving overall stability. Under high temperatures or external forces, the outer casing 40 of the battery cell 6 is prone to deformation. By strengthening the connection between the third support layer 206 and the first support layer 203, the deformation resistance of the outer casing 40 can be effectively improved, thereby ensuring the stable operation of the battery cell 6 in complex environments.

[0160] The above structure improves the structural strength of the third support layer 206 and the first support layer 203, and improves the operational stability of the battery cell 6.

[0161] In some embodiments of this application, the third support layer 206 and the first support layer 203 are integrally formed.

[0162] The unibody structure integrates multiple components into a single unit, simplifying the production process. Traditional assembly methods require multiple independent parts to be combined through welding, screws, and other methods, while unibody molding eliminates these steps, directly molding the components in one piece through processes such as injection molding and die casting. The unibody molding process significantly reduces processing time. Because multiple components are integrated into a single unit, there is no need to process and assemble each component individually, thus saving time and costs. The above technical solution improves the manufacturing efficiency of the outer shell 40.

[0163] like Figure 6 As shown, in some embodiments of this application, the second high-temperature resistant layer 207 is interconnected with the first high-temperature resistant layer 204. This structure improves the structural strength of the second high-temperature resistant layer 207 and the first high-temperature resistant layer 204, thereby enhancing the high-temperature resistance of the battery cell 6.

[0164] In some embodiments of this application, the second high-temperature resistant layer and the first high-temperature resistant layer 204 are integrally formed. The above-described technical solution improves the manufacturing efficiency of the outer shell 40.

[0165] like Figure 8 As shown, in some embodiments of this application, along the first direction X, the thickness of the first support layer 203 is D1, and the thickness of the first high-temperature resistant layer 204 is H1, where H1 < D1.

[0166] The material density of the first support layer 203 is relatively low. Therefore, by increasing the thickness of the first support layer 203, the energy density of the battery cell 6 can be reduced while ensuring structural strength.

[0167] In some embodiments of this application, D1 and H1 satisfy the relationship: 1 / 3 ≤ H1 / D1 ≤ 1 / 5.

[0168] By ensuring that the first high-temperature resistant layer 204 has sufficient thickness, the battery cell 6 can be effectively protected from the effects of high-temperature environments. The main function of the first high-temperature resistant layer 204 is to reduce the deformation or cracking of the battery under high-temperature conditions. Therefore, an appropriate thickness is crucial for maintaining the safety and stability of the battery.

[0169] While increasing the thickness of the high-temperature resistant layer can improve high-temperature resistance, an excessively thick high-temperature resistant layer increases the overall weight of the battery, thereby reducing energy density. By limiting the thickness of the high-temperature resistant layer to within 1 / 5 of the thickness of the first support layer 203, it is possible to minimize the amount of high-temperature resistant material used while maintaining sufficient high-temperature resistance, thereby reducing the overall weight of the battery and increasing energy density.

[0170] For example, the first support layer 203 is an aluminum layer with a thickness of 0.1mm to 10mm or 0.1mm to 1mm. The first high-temperature resistant layer 204 is a steel layer with a thickness of 0.01mm to 5mm or 0.1mm to 0.3mm. When the aluminum layer is 0.5mm thick, the steel layer can be 0.1mm thick, forming good structural support and high-temperature resistance.

[0171] The above structure, by setting the thickness of the first high-temperature resistant layer 204 within a suitable range, can improve the high-temperature resistance performance of the battery cell 6 and increase the energy density of the battery cell 6.

[0172] In some embodiments of this application, along the second direction Y, the thickness of the third support layer 206 is D3, and the thickness of the second high-temperature resistant layer 207 is H2, where H2 < D3.

[0173] In the above technical solution, by setting the thickness of the third support layer 206 to be greater than the thickness of the second high-temperature resistant layer 207, the total weight of the battery cell 6 is reduced and the energy density of the battery cell 6 is increased.

[0174] In some embodiments of this application, D3 and H2 satisfy the relationship: 1 / 4 ≤ H2 / D3 ≤ 1 / 6.

[0175] For example, the third support layer 206 is an aluminum layer, and its thickness is 0.1mm to 10mm or 0.1mm to 1mm. The second high-temperature resistant layer 207 is a steel layer, and its thickness is 0.01mm to 5mm or 0.1mm to 0.3mm. When the aluminum layer is 0.65mm thick, the steel layer can be 0.15mm thick, forming good structural support and high-temperature resistance.

[0176] The above structure, by setting the thickness of the second high-temperature resistant layer 207 within a suitable range, can improve the high-temperature resistance performance of the battery cell 6 and increase the energy density of the battery cell 6.

[0177] like Figure 9 As shown, in some embodiments of this application, the housing 20 further includes a third wall disposed opposite to the end cap 30. The third wall includes a fifth support layer 209 and a third high-temperature resistant layer 210 stacked along a third direction Z. The third direction Z is perpendicular to both the first direction X and the second direction Y. In the above structure, the high-temperature resistant layer is provided on the bottom wall of the housing 20, which improves the high-temperature resistance of the bottom of the housing 20, improves the overall structural strength of the outer shell 40, and thus improves the operational stability of the battery cell 6.

[0178] In some embodiments of this application, the third wall further includes a sixth support layer disposed on the side of the third high-temperature resistant layer 210 opposite to the fifth support layer 209. The above structure further improves the structural strength of the third wall, reduces its weight, and increases the energy density of the battery cell 6.

[0179] like Figure 10 As shown, in some embodiments of this application, along the third direction Z, the thickness of the fifth support layer 209 is D5, and the thickness of the third high-temperature resistant layer 210 is H3, where H3 < D5. The above structure, by setting the thickness of the fifth support layer 209 to be greater than the thickness of the third high-temperature resistant layer 210, reduces the total weight of the battery cell 6 and increases the energy density of the battery cell 6.

[0180] In some embodiments of this application, D5 and H3 satisfy the relationship: 1 / 4 ≤ H3 / D5 ≤ 1 / 6.

[0181] For example, the fifth support layer 209 is an aluminum layer with a thickness of 0.1mm to 10mm or 0.1mm to 1mm. The third high-temperature resistant layer 210 is a steel layer with a thickness of 0.01mm to 5mm or 0.1mm to 0.3mm. When the fifth support layer 209 is 1mm thick, the third high-temperature resistant layer 210 can be 0.2mm thick, forming good structural support and high-temperature resistance.

[0182] The above structure, by setting the thickness of the third high-temperature resistant layer 210 within a suitable range, can improve the high-temperature resistance of the battery cell 6 and increase the energy density of the battery cell 6.

[0183] In some embodiments of this application, D1, D3, and D5 satisfy the relationship: D1≤D3≤D5. The above structure, with different thicknesses depending on the area of ​​the side surfaces of the housing 20, has a smaller thickness on larger surfaces and a larger thickness on smaller surfaces. This reduces the overall thickness of the support layer while maintaining support strength, thereby increasing the energy density of the battery cell 6.

[0184] In some embodiments of this application, H1, H2, and H3 satisfy the relationship: H3≤H2≤H1. The above structure, with a thicker high-temperature resistant layer on the larger side, effectively improves the high-temperature resistance of the casing 20 and enhances the operational stability of the battery cell 6.

[0185] In some optional embodiments, the battery cell 6 includes a housing 40 having a receiving cavity for accommodating the electrode assembly 10. The housing 40 includes an end cap 30 and a shell 20. The shell 20 includes two first walls 201 disposed opposite each other along a first direction X and two second walls 202 disposed opposite each other along a second direction Y. The first direction X is perpendicular to the second direction Y. The area of ​​the first wall 201 is greater than or equal to the area of ​​the second wall 202. The first wall 201 includes a first support layer 203 and a first high-temperature resistant layer 204 stacked along the first direction X. The first support layer 203 is an aluminum layer, and the first high-temperature resistant layer 204 is a steel layer. The first support layer 203 and the first high-temperature resistant layer 204 are connected by die casting. The first support layer 203 is disposed on the side of the first high-temperature resistant layer 204 facing the receiving cavity. The second wall 202 includes a third support layer 206 and a second high-temperature resistant layer 207 stacked along the second direction Y. The third support layer 206 is an aluminum layer, and the second high-temperature resistant layer 207 is a steel layer. The third support layer 206 is interconnected with the first support layer 203. The second high-temperature resistant layer 207 is interconnected with the first high-temperature resistant layer 204. The housing 20 also includes a third wall disposed opposite to the end cap 30. The third wall includes a fifth support layer 209 and a third high-temperature resistant layer 210 stacked along a third direction Z. The third direction Z is perpendicular to both the first direction X and the second direction Y. The fifth support layer 209 is an aluminum layer, and the third high-temperature resistant layer 210 is a steel layer.

[0186] This application provides a battery device 2, which includes the battery cell 6 described in the above embodiments. This application also provides an electrical device, which includes the battery device 2 described in the above embodiments, and the battery device 2 is used to provide electrical energy. Both the battery device 2 and the electrical device include the battery cell 6 described in the above embodiments. A housing 40 is used to house the electrode assembly 10, providing a stable environment for the operation of the electrode assembly 10. The first wall 201 of the housing 40 includes a first support layer 203, improving the overall structural strength of the housing 40. The first wall 201 includes a first high-temperature resistant layer 204, which can withstand temperatures above 661°C, maintaining the shape of the first wall 201 even when the temperature of the battery cell 6 rises. The first wall 201 is the side with the largest area of ​​the housing 40. The integrity of the shape of the first wall 201 improves the structural and shape integrity of the entire housing 20, reduces the risk of deformation and breakage of the housing 20, and improves the operational stability of the battery cell 6.

[0187] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The device includes a housing having a receiving cavity for accommodating an electrode assembly. The housing includes an end cap and a shell. The shell includes two first walls disposed opposite each other along a first direction and two second walls disposed opposite each other along a second direction. The first direction is perpendicular to the second direction. The area of ​​the first wall is greater than or equal to the area of ​​the second wall. The first wall includes a first support layer and a first high-temperature resistant layer stacked along the first direction. The melting point T of the material of the first high-temperature resistant layer is: 661℃≤T≤2100℃.

2. The battery cell according to claim 1, characterized in that, The material density ρ of the first support layer is 1700 kg / m³. 3 ≤ρ≤4800Kg / m 3 .

3. The battery cell according to claim 1 or 2, characterized in that, The first support layer includes at least one of an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, and a titanium alloy layer.

4. The battery cell according to any one of claims 1-3, characterized in that, The first high-temperature resistant layer includes at least one of a steel layer, a stainless steel layer, a carbon steel layer, and a ceramic layer.

5. The battery cell according to any one of claims 1-4, characterized in that, The first support layer and the first high-temperature resistant layer are connected by die casting, or the first support layer and the first high-temperature resistant layer are formed by casting.

6. The battery cell according to any one of claims 1-5, characterized in that, The first support layer is located on the side of the first high-temperature resistant layer facing the cavity.

7. The battery cell according to claim 6, characterized in that, The first wall also includes a second support layer disposed on the side of the first high-temperature resistant layer opposite to the first support layer.

8. The battery cell according to any one of claims 1-7, characterized in that, The second wall includes a third support layer and a second high-temperature resistant layer stacked along the second direction.

9. The battery cell according to claim 8, characterized in that, The second wall also includes a fourth support layer disposed on the side of the second high-temperature resistant layer opposite to the third support layer.

10. The battery cell according to claim 8, characterized in that, The third support layer is interconnected with the first support layer.

11. The battery cell according to claim 10, characterized in that, The third support layer is integrally formed with the first support layer.

12. The battery cell according to claim 11, characterized in that, The second high-temperature resistant layer is interconnected with the first high-temperature resistant layer.

13. The battery cell according to claim 12, characterized in that, The second high-temperature resistant layer and the first high-temperature resistant layer are integrally formed.

14. The battery cell according to any one of claims 8-13, characterized in that, Along the first direction, the thickness of the first support layer is D1, and the thickness of the first high-temperature resistant layer is H1, where H1 < D1.

15. The battery cell according to claim 14, characterized in that, D1 and H1 satisfy the relationship: 1 / 3≤H1 / D1≤1 / 5.

16. The battery cell according to claim 14, characterized in that, Along the second direction, the thickness of the third support layer is D3, and the thickness of the second high-temperature resistant layer is H2, where H2 < D3.

17. The battery cell according to claim 16, characterized in that, D3 and H2 satisfy the relationship: 1 / 4 ≤ H2 / D3 ≤ 1 / 6.

18. The battery cell according to claim 17, characterized in that, The housing also includes a third wall disposed opposite to the end cap. The third wall includes a fifth support layer and a third high-temperature resistant layer stacked along a third direction. The third direction is perpendicular to both the first direction and the second direction.

19. The battery cell according to claim 18, characterized in that, The third wall also includes a sixth support layer disposed on the side of the third high-temperature resistant layer opposite to the fifth support layer.

20. The battery cell according to claim 19, characterized in that, Along the third direction, the thickness of the fifth support layer is D5, and the thickness of the third high-temperature resistant layer is H3, where H3 < D5.

21. The battery cell according to claim 20, characterized in that, D5 and H3 satisfy the relationship: 1 / 4 ≤ H3 / D5 ≤ 1 / 6.

22. The battery cell according to claim 20 or 21, characterized in that, D1, D3, and D5 satisfy the relationship: D1≤D3≤D5.

23. The battery cell according to any one of claims 20-22, characterized in that, H1, H2, and H3 satisfy the relationship: H3≤H2≤H1.

24. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-23.

25. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 24, the battery device being used to provide electrical energy.

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