Heat exchange assembly, battery apparatus, electrical device and energy storage device

Abstract

Provided in the embodiments of the present disclosure are a heat exchange assembly, a battery apparatus, an electrical device and an energy storage device. The battery apparatus comprises a box body assembly, a battery cell assembly, and the heat exchange assembly. The box body assembly is internally provided with a first accommodating cavity, the battery cell assembly being arranged in the first accommodating cavity. The heat exchange assembly comprises a heat exchange layer and a first thermal insulation layer, the heat exchange layer being a flexible structure and being configured to be in heat exchange cooperation with the battery cell assembly. The first thermal insulation layer is arranged between the box body assembly and the side of the heat exchange layer facing away from the battery cell assembly. The battery apparatus provided by the embodiments of the present disclosure is beneficial to improving the degree of fit between the heat exchange assembly and the box body assembly and / or the battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. In addition, the provision of the first thermal insulation layer between the box body assembly and the side of the heat exchange layer facing away from the battery cell assembly can thermally insulate the battery cell assembly, thereby solving the problem of low peripheral temperature of the battery cell assembly, and improving the thermal management performance of the battery apparatus.

Description

Heat exchange components, battery devices, electrical equipment, and energy storage devices

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202422074713.4, filed on August 26, 2024, entitled "Heat Exchange Component, Battery Device, Electrical Equipment and Energy Storage Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery device technology, and in particular to a heat exchange component, battery device, electrical equipment, and energy storage device. Background Technology

[0004] This section is intended to provide background or context for embodiments of this disclosure. The description herein is not intended to imply that it is prior art simply because it is included in this section.

[0005] In new energy vehicles equipped with battery devices, the battery device can provide all or part of the power. During the use of the battery device, the individual battery cells within the device generate heat. If this heat is too high, it will adversely affect the performance and lifespan of the battery device. Therefore, a cooling system is usually installed to dissipate heat from the battery device. However, if the battery device is in a low-temperature static state, there is a problem that the heat of the battery device can be lost through the cooling system, resulting in a low temperature around the battery device. Summary of the Invention

[0006] In view of this, the present disclosure aims to provide a heat exchange component, a battery device, an electrical device, and an energy storage device, which can, to some extent, improve the problem of heat loss from the battery device through the heat exchange component, resulting in a low temperature around the battery device.

[0007] To achieve the above objectives, a first aspect of this disclosure provides a battery device, comprising:

[0008] The housing assembly has a first receiving cavity inside;

[0009] A battery cell assembly is disposed within the first receiving cavity;

[0010] A heat exchange assembly, comprising a heat exchange layer and a first heat insulation layer; the heat exchange layer is a flexible structure and is configured to cooperate with the battery cell assembly for heat exchange.

[0011] The first heat insulation layer is positioned between the heat exchange layer and the housing assembly on the side of the heat exchange layer away from the individual battery cells.

[0012] The battery device provided in this disclosure includes a housing assembly, battery cell assemblies, and a heat exchange assembly. The battery cell assemblies are disposed within a first receiving cavity of the housing assembly, which protects them. The heat exchange assembly exchanges heat with the battery cell assemblies through a heat exchange layer. On one hand, by making the heat exchange layer a flexible structure, it can better fit with the housing assembly and / or battery cell assemblies, thereby facilitating the absorption of assembly tolerances and eliminating the need for sealants or thermally conductive materials. This improves the fit between the heat exchange assembly and the housing assembly and / or battery cell assemblies, increases the effective heat exchange area, and thus improves the heat exchange efficiency and effect. On the other hand, by providing a first heat insulation layer between the heat exchange layer and the housing assembly on the side facing away from the battery cell assemblies, the first heat insulation layer can insulate the battery cell assemblies, improving the low peripheral temperature of the battery cell assemblies and enhancing the thermal management performance of the battery device.

[0013] In some embodiments, an insulating cavity is provided inside the first insulating layer.

[0014] In this embodiment, a heat-insulating cavity is provided inside the first heat-insulating layer. This cavity facilitates heat exchange between the heat exchange medium within the flow channel and the external environment, thus providing insulation for the battery cell assembly and mitigating the low temperature around the assembly. Furthermore, the heat-insulating cavity also acts as a buffer, providing some protection and increasing the battery device's impact resistance.

[0015] In some embodiments, the insulation cavity is filled with an insulation medium, the thermal conductivity of which is lower than that of the first insulation layer.

[0016] It helps to improve the heat exchange between the heat exchange medium in the medium flow channel and the external environment, thus playing a role in heat preservation for the battery cell module and improving the problem of low temperature around the battery cell module.

[0017] In some embodiments, the heat exchange layer and the first insulation layer together define a medium flow channel for conducting the heat exchange medium.

[0018] In other words, the heat exchange medium flows between the heat exchange layer and the first insulation layer, and exchanges heat with the battery cell assembly through the heat exchange layer on the side closer to the battery cell assembly, while the first insulation layer on the side farther away from the battery cell assembly can play a heat preservation role. This structure is simple.

[0019] In some embodiments, the heat exchange layer includes at least two flexible elements, which are stacked together and a medium flow channel is formed between the at least two flexible elements for conducting the heat exchange medium.

[0020] In other words, the heat exchange medium circulates within the heat exchange layer and exchanges heat with the battery cell assembly, while the first insulation layer located on the side of the heat exchange layer away from the battery cell assembly can play a role in heat preservation. This structure is simple.

[0021] In some embodiments, an insulating cavity is provided between the first insulating layer and the flexible member.

[0022] In this embodiment, a heat-insulating cavity is provided between the first heat-insulating layer and the flexible component. This cavity facilitates heat exchange between the heat exchange medium within the flow channel and the external environment, effectively insulating the battery cell assembly and mitigating the low periphery temperature of the battery cell assembly. Furthermore, the heat-insulating cavity also acts as a buffer, providing some protection and increasing the battery device's impact resistance. Moreover, since the thermal conductivity of the first heat-insulating layer is lower than that of the heat exchange layer, the heat insulation effect of the heat exchange assembly is further improved.

[0023] In some embodiments, the insulation cavity is filled with an insulation medium, the thermal conductivity of which is lower than that of the first insulation layer.

[0024] In this embodiment, by filling the heat insulation cavity with a heat insulation medium, it is further beneficial to improve the heat exchange between the heat exchange medium in the medium flow channel and the external environment, that is, to play a heat preservation role for the battery cell assembly, and further improve the problem of low temperature around the battery cell assembly.

[0025] In some embodiments, a thermal insulation cavity is formed between at least two flexible elements, and the thermal insulation cavity is located on the periphery of the medium flow channel.

[0026] In this embodiment, by forming a heat-insulating cavity between at least two flexible components, with the cavity located around the periphery of the medium flow channel, the heat loss of the battery device through the heat exchange layer to the periphery is effectively mitigated, thereby improving the heat insulation effect of the battery device. Furthermore, by making the heat exchange layer from flexible components, which are lightweight, the weight of the battery device is reduced, lowering the production cost of the heat exchange components and potentially increasing the energy density of the battery device. Moreover, the flexible components possess electrical insulation properties, eliminating the need for insulation treatment, which helps reduce the risk of leakage and production costs, thereby improving the reliability of the battery device.

[0027] In some embodiments, the first thermal insulation layer is configured as a flexible structure.

[0028] It also helps the first insulation layer to fit better with the housing components and / or bottom liner, thereby improving the insulation effect of the heat exchange components.

[0029] In some embodiments, the thermal conductivity of the first insulation layer is lower than that of the heat exchange layer.

[0030] Setting the thermal conductivity of the first insulation layer to be lower than that of the heat exchange layer helps to further improve the heat insulation effect of the heat exchange component.

[0031] In some embodiments, the heat exchange assembly further includes a second heat insulation layer, wherein the first heat insulation layer is folded toward the side of the battery cell assembly to form the second heat insulation layer.

[0032] In this embodiment, the heat exchange component is provided with a second heat insulation layer. The first heat insulation layer is formed by folding it toward the side of the battery cell assembly. This helps to improve the problem of heat loss from the battery cell assembly to the side, thereby improving the heat preservation effect of the battery device.

[0033] In some embodiments, the first heat insulation layer and the heat exchange layer are stacked, with the first heat insulation layer located on the side of the heat exchange layer away from the battery cell assembly; the edge of the heat exchange assembly is formed with a flange, which surrounds the periphery of the battery cell assembly or the housing assembly.

[0034] By forming flanges at the edges of the heat exchange components, which surround the periphery of the battery cell assembly or the housing assembly, the heat insulation performance is further improved, while the side protection performance of the battery device is also enhanced.

[0035] In some embodiments, at least two flexible elements are configured as metal plasticized films.

[0036] In this embodiment, because the metal plasticized film is thin and lightweight, and because a medium flow channel is formed between at least two metal plasticized films, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange assembly can be reduced. Furthermore, the heat exchange assembly does not react with the internally flowing heat exchange medium, thus eliminating the risk of corrosion and leakage.

[0037] In some embodiments, at least two flexible elements are configured as aluminum-plastic films.

[0038] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0039] In some embodiments, the flexible element has a layered structure, comprising a metal layer and a non-metal layer, which are stacked sequentially.

[0040] In this embodiment, the flexible component, composed of sequentially stacked metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel between at least two flexible components, it is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly. In addition, the heat exchange assembly does not react with the internally flowing heat exchange medium, therefore eliminating the risk of corrosion and leakage.

[0041] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0042] This allows flexible components to have a certain structural strength and to serve as an isolation mechanism.

[0043] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0044] This allows flexible components to have a certain degree of waterproofing.

[0045] In some embodiments, the non-metallic layer is a hot-melt layer.

[0046] Here, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metallic layer together through hot melting, which is simple to form and has high production efficiency.

[0047] In some embodiments, the flexible element has a layered structure, comprising a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, with the waterproof layer being closer to the medium flow channel than the corrosion-resistant layer.

[0048] In this embodiment, by configuring the flexible component to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer, which helps to improve the reliability of the heat exchange component.

[0049] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0050] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-100μm, the flexible component can have a certain structural strength and flexibility.

[0051] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0052] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-15μm, the flexible component can be further made to have a certain structural strength and flexibility.

[0053] In some embodiments, the thickness of the corrosion-resistant layer is 5μm-20μm.

[0054] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5μm-20μm, the wear resistance and toughness of the flexible component can be improved.

[0055] In some embodiments, the thickness of the waterproof layer is 50μm-120μm.

[0056] In this embodiment, by setting the thickness of the waterproof layer to 50μm-120μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate the hot pressing connection of flexible components through the waterproof layer.

[0057] In some embodiments, the thickness of the flexible element is 0.05mm-0.3mm.

[0058] By setting the thickness of the flexible component to 0.05mm-0.3mm, the heat exchange assembly made of the flexible component has a certain structural strength while making the overall thickness of the heat exchange assembly small. This helps to reduce the overall volume and weight of the battery, thereby increasing the energy density of the battery.

[0059] In some embodiments, the thickness of the flexible element is 0.08mm-0.2mm.

[0060] By setting the thickness of the flexible component to 0.08mm-0.2mm, the heat exchange assembly made of the flexible component has a certain structural strength, while further reducing the overall thickness of the heat exchange assembly. This is beneficial to further reduce the overall volume and weight of the battery, thereby further increasing the energy density of the battery.

[0061] In some embodiments, the elastic modulus of the flexible element is 0.1 MPa-10000 MPa.

[0062] In this embodiment, by setting the elastic modulus of the flexible component to 0.1MPa-10000MPa, the flexible component has a certain structural strength, which improves the reliability of the heat exchange assembly and also has a certain deformation capacity. This can improve the fit between the heat exchange assembly and the housing assembly and / or the battery assembly and battery cell assembly, thereby increasing the effective heat exchange area between the heat exchange assembly and the housing assembly and / or the battery assembly and battery cell assembly, thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0063] A second aspect of this disclosure provides a heat exchange component, which is the heat exchange component of the battery device described above, and is used to exchange heat with a single battery cell assembly.

[0064] The heat exchange assembly provided in this disclosure exchanges heat with the battery cell assembly through a heat exchange layer. On one hand, by making the heat exchange layer a flexible structure, it can better fit with the housing assembly and / or battery cell assembly, thereby facilitating the absorption of assembly tolerances and eliminating the need for sealants or thermally conductive materials. This improves the fit between the heat exchange assembly and the housing assembly and / or battery cell assembly, increasing the effective heat exchange area between them and thus improving the heat exchange efficiency and effect. On the other hand, by providing a first heat insulation layer between the heat exchange layer and the housing assembly on the side facing away from the battery cell assembly, the first heat insulation layer can insulate the battery cell assembly, improving the low peripheral temperature of the battery cell assembly and enhancing the thermal management performance of the battery device.

[0065] A third aspect of this disclosure provides an electrical device, including the battery device or the heat exchange component described above.

[0066] The battery device of the electrical equipment provided in this disclosure includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed within a first receiving cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly exchanges heat with the battery cell assembly through a heat exchange layer. On the one hand, by making the heat exchange layer a flexible structure, the heat exchange layer can better fit with the housing assembly and / or the battery cell assembly, thereby facilitating the absorption of assembly tolerances of the heat exchange assembly. This eliminates the need for sealants or thermally conductive materials, improving the fit between the heat exchange assembly and the housing assembly and / or the battery cell assembly, increasing the effective heat exchange area between the heat exchange assembly and the housing assembly and / or the battery cell assembly, and thus improving the heat exchange efficiency and effect of the heat exchange assembly. On the other hand, by providing a first heat insulation layer between the heat exchange layer and the housing assembly on the side of the heat exchange layer away from the battery cell assembly, the first heat insulation layer can insulate the battery cell assembly, improving the problem of low peripheral temperature of the battery cell assembly and enhancing the thermal management performance of the battery device.

[0067] A fourth aspect of this disclosure provides an energy storage device, including the battery device described above or the heat exchange component described above.

[0068] The battery device of the energy storage device provided in this disclosure includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed within a first receiving cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly exchanges heat with the battery cell assembly through a heat exchange layer. On the one hand, by making the heat exchange layer a flexible structure, the heat exchange layer can better fit with the housing assembly and / or the battery cell assembly, thereby facilitating the absorption of assembly tolerances of the heat exchange assembly, eliminating the need for sealants or thermally conductive materials, improving the fit between the heat exchange assembly and the housing assembly and / or the battery cell assembly, increasing the effective heat exchange area between the heat exchange assembly and the housing assembly and / or the battery cell assembly, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. On the other hand, by providing a first heat insulation layer between the heat exchange layer and the housing assembly on the side away from the battery cell assembly, the first heat insulation layer can insulate the battery cell assembly, improving the problem of low peripheral temperature of the battery cell assembly and improving the thermal management performance of the battery device. Attached Figure Description

[0069] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this disclosure;

[0070] Figure 2 is an exploded perspective view of a battery device provided in an embodiment of the present disclosure, wherein the heat exchange component is disposed in the second receiving cavity;

[0071] Figure 3 is a cross-sectional view of the battery device shown in Figure 2 after assembly in the BB direction;

[0072] Figure 4 is an enlarged view of point A in Figure 3;

[0073] Figure 5 is a schematic diagram of the connection structure between the heat exchange component and the bottom cover plate provided in an embodiment of the present disclosure;

[0074] Figure 6 is a schematic diagram of the structure of a heat exchange component provided in an embodiment of this disclosure;

[0075] Figure 7 is a schematic diagram of the structure of a bottom protective plate provided in an embodiment of the present disclosure;

[0076] Figure 8 is a schematic diagram of the structure of a heat exchange component provided in another embodiment of this disclosure;

[0077] Figure 9 is a cross-sectional view along the BB direction in Figure 8;

[0078] Figure 10 is an enlarged view of point C in Figure 9.

[0079] Explanation of reference numerals in the attached drawings: 10. Battery cell assembly; 11. Battery cell; 20. Housing assembly; 21. Housing body; 211. First housing section; 212. Second housing section; 22. Bottom protective plate; 221. Connecting part; 222. Limiting structure; 23. First receiving cavity; 24. Second receiving cavity; 30. Heat exchange assembly; 31. Flexible component; 32. Medium flow channel; 33. Clearance hole; 34. Hot pressing area; 35. Inlet; 36. Outlet; 37. Heat exchange layer; 38. First heat insulation layer; 39. Heat insulation cavity; 40. Flanged edge; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0080] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0081] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0082] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0083] In this embodiment of the disclosure, 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.

[0084] 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 disclosed herein are not limited to this.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.).

[0089] 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 disclosure 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 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 oxides 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 Al 0.05 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.

[0090] In some embodiments, the positive 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 positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] 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.).

[0093] 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.

[0094] 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.

[0095] 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 disclosure 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.

[0096] 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.

[0097] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0098] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0099] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0100] In some embodiments, the separator is a separator membrane. This disclosure 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.

[0101] 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.

[0102] 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.

[0103] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure 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.

[0104] Liquid electrolytes include electrolyte salts and solvents.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0109] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0110] 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.

[0111] 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-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0112] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0113] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0114] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0115] In some implementations, the electrode assembly is a stacked structure.

[0116] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0117] 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.

[0118] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0119] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0120] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0121] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0122] 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.

[0123] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. 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.

[0124] 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 disclosure does not impose any particular limitations.

[0125] 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.

[0126] 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.

[0127] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0128] During the use of a battery device, the individual battery cells generate heat. Excessive heat can negatively impact the performance and lifespan of the battery device. Therefore, effectively dissipating heat from the battery cells has become an important research direction in this field. Related technologies utilize a cooling system installed within the battery device housing to cool the individual battery cells. This cooling system may include multiple aluminum water-cooled plates laid within the battery device housing, with the surfaces of these plates in contact with the surfaces of the individual battery cells. During use, a heat exchange medium, such as water, flows through these water-cooled plates, carrying away heat from the battery cells and cooling them down. However, when the aluminum water-cooled plates in the cooling system do not adhere well to the surfaces of the battery cells, the heat exchange efficiency and effect are poor. Furthermore, assembly tolerance compensation and the use of sealant are required during assembly with the battery cell assembly, resulting in higher production costs. Furthermore, the water-cooling plate and battery housing have high rigidity, requiring the use of rigid structural adhesive, which makes disassembly difficult. If self-adhesive, soft, or double-sided adhesive is used, the rigidity of the water-cooling plate and battery housing is relatively good, but if there are gaps or mismatches in flatness, adhesive failure may occur. In addition, if the battery unit is in a low-temperature static state, heat from the battery unit can be lost through the cooling system, resulting in a low temperature around the battery unit.

[0129] In view of this, in order to improve the problem of heat loss from the battery device through the heat exchange assembly, resulting in a low temperature at the periphery of the battery device, this disclosure provides a battery device including a housing assembly, a battery cell assembly, and a heat exchange assembly. The housing assembly has a first receiving cavity inside. The battery cell assembly is disposed within the first receiving cavity. The heat exchange assembly includes a heat exchange layer and a first heat insulation layer; the heat exchange layer is a flexible structure and is configured to heat exchange with the battery cell assembly. The first heat insulation layer is disposed between the side of the heat exchange layer facing away from the battery cell assembly and the housing assembly.

[0130] The battery device provided in this disclosure includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed within a first receiving cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly exchanges heat with the battery cell assembly through a heat exchange layer. On one hand, by making the heat exchange layer a flexible structure with a certain deformation capability, the heat exchange layer can better fit and adapt to the housing assembly and / or battery cell assembly, thereby absorbing assembly tolerances of the heat exchange assembly, improving the fit between the heat exchange assembly and the housing assembly and / or battery cell assembly, increasing the effective heat exchange area between the heat exchange assembly and the housing assembly and / or battery cell assembly, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. On the other hand, by providing a first heat insulation layer between the heat exchange layer and the housing assembly on the side away from the battery cell assembly, the first heat insulation layer can insulate the battery cell assembly, improve the problem of low peripheral temperature of the battery cell assembly, and improve the thermal management performance of the battery device.

[0131] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical devices include battery devices according to any embodiment of this disclosure, and the battery devices are used to provide electrical energy.

[0132] Electrical equipment 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 disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0133] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housing assemblies and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all described using electric vehicles as examples.

[0134] Referring to Figure 1, a controller 200, a motor 300, and a battery device 100 can be installed inside the vehicle 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed 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's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this disclosure, 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.

[0135] To meet different power demands, the battery device 100 includes a battery cell assembly 10, which may include multiple battery cells 11. Each battery cell 11 is the smallest unit that makes up a battery device module or battery pack. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel connections. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration and then housed within a housing assembly 20. Alternatively, the battery device 100 can also consist of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form battery device modules, which are then connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing assembly 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 11. Each battery cell 11 can be a secondary battery device or a primary battery device; it can also be a lithium-sulfur battery device, a sodium-ion battery device, or a magnesium-ion battery device, but is not limited to these. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0136] This disclosure provides a battery device 100, including a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The housing assembly 20 has a first receiving cavity 23 inside. The battery cell assembly 10 is disposed within the first receiving cavity 23. The heat exchange assembly 30 includes a heat exchange layer 37 and a first heat insulation layer 38; the heat exchange layer 37 is a flexible structure and is configured to heat-exchange with the battery cell assembly 10. The first heat insulation layer 38 is disposed between the side of the heat exchange layer 37 facing away from the battery cell assembly 10 and the housing assembly 20.

[0137] Referring to Figure 2, the battery device 100 includes a housing assembly 20 and a battery cell assembly 10. The battery cell assembly 10 includes at least one battery cell 11, which is disposed within the first receiving cavity 23 of the housing assembly 20.

[0138] The enclosure component 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the enclosure component 20 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0139] The housing assembly 20 is used to encapsulate the battery cell assembly 10. The housing assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell assembly 10.

[0140] Please refer to Figures 2 to 8. This disclosure provides a heat exchange component. The heat exchange component 30 is the heat exchange component 30 of the battery device 100 provided in this disclosure. The heat exchange component 30 is used to exchange heat with the battery cell assembly 10.

[0141] Here, the heat exchange component 30 can be disposed inside the first receiving cavity 23, that is, it can be in direct contact with the battery cell assembly 10, or it can be disposed outside the first receiving cavity 23, and heat is transferred through an intermediate medium, thereby realizing heat exchange between the heat exchange component 30 and the battery cell assembly 10.

[0142] For example, the heat exchange layer 37 includes at least two flexible members 31, which are stacked together, and at least one medium flow channel 32 is formed between adjacent flexible members 31. The at least one medium flow channel 32 is used to conduct heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0143] The heat exchange layer 37 includes at least two flexible elements 31, meaning that the number of flexible elements 31 included in the heat exchange layer 37 can be two or more.

[0144] Here, the flexibility in flexible component 31 refers to the material properties of the structure. This type of property can be due to the material's light weight, or it can be due to at least one of the material's properties such as thickness, stiffness, strength, and elastic modulus. As an example, the material of flexible component 31 can be selected as a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of flexible component 31. By setting the heat exchange assembly 30 in the form of flexible component 31 in this embodiment, it is beneficial to reduce the weight of heat exchange assembly 30.

[0145] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve a cooling effect on the battery cell 11, such as being gaseous or liquid. In this embodiment, a coolant is used as an example for description.

[0146] For example, referring to Figures 5 and 6, the heat exchange assembly 30 also includes an inlet 35 and an outlet 36, both of which are connected to the medium flow channel 32.

[0147] Here, the inlet 35 and outlet 36 of the heat exchange component 30 are used for connecting to the pipelines of the vehicle or electrical equipment.

[0148] The principle of heat exchange component 30 exchanging heat with battery cell assembly 10 through heat exchange layer 37 is as follows: the heat exchange medium output from heat exchange medium source (not shown) enters the medium flow channel through inlet 35 of heat exchange component 30. After heat exchange with battery cell assembly 10, the heat exchange medium flows out through outlet 36 of heat exchange component 30, thus completing the heat exchange of battery cell assembly 10.

[0149] Here, the heat exchange component 30 can exchange heat with the battery cell assembly 10 through the heat exchange layer 37, either by dissipating heat from the battery cell assembly 10 or by heating the battery cell assembly 10.

[0150] The principle of heat exchange component 30 dissipating heat from battery cell component 10 through heat exchange layer 37 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel through the inlet 35 of heat exchange component 30. After the heat exchange medium absorbs the heat generated during the operation of battery cell component 10, the heat exchange medium flows out through the outlet 36 of heat exchange component 30, releasing heat and completing the cooling and heat dissipation of battery cell component 10.

[0151] The principle of the heat exchange component 30 heating the battery cell assembly 10 through the heat exchange layer 37 is as follows: the heat exchange medium output from the heat exchange source enters the medium flow channel through the inlet 35 of the heat exchange component 30, and the heat exchange medium transfers heat to the battery cell assembly 10. After heating the battery cell assembly 10, the heat exchange medium flows out through the outlet 36 of the heat exchange component 30, thus completing the heating of the battery cell assembly 10.

[0152] The heat exchange layer 37 is configured as a flexible structure, and the heat exchange layer 37 has certain expandable or contractible characteristics. It can also be understood that the heat exchange layer 37 can be an elastically deformable structure. The heat exchange layer 37 has the ability to deform and recover deformation, so that the heat exchange component 30 can be formed into a contoured structure. The heat exchange component 30 can better adapt to the external contour shape of the battery cell or other components, so as to improve the fit between the heat exchange component 30 and the housing component 20 and / or the battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the housing component 20 and / or the battery cell component 10, and thus improving the heat exchange efficiency.

[0153] It should be noted that the flexible component 31 can have conductive properties, which is beneficial for equipotential setting; the flexible component 31 can also have electrical insulation properties, eliminating the need for insulation treatment, which helps reduce the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0154] The battery device provided in this embodiment includes a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The battery cell assembly 10 is disposed within a first receiving cavity 23 of the housing assembly 20, and the housing assembly 20 protects the battery cell assembly 10. The heat exchange assembly 30 exchanges heat with the battery cell assembly 10 through a heat exchange layer 37. On the one hand, by setting the heat exchange layer 37 as a flexible structure with a certain deformation capability, the heat exchange layer 37 can better fit with the housing assembly 20 and / or the battery cell assembly 10, thereby facilitating the absorption of assembly tolerances of the heat exchange assembly 30. This eliminates the need for sealants or thermally conductive materials, improving the fit and adaptation between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10, increasing the effective heat exchange area between the heat exchange assembly 30 and the housing assembly 20 and / or the battery cell assembly 10, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30. On the other hand, by setting a first heat insulation layer 38 between the side of the heat exchange layer 37 away from the battery cell assembly 10 and the housing assembly 20, the setting of the first heat insulation layer 38 can keep the battery cell assembly 10 warm, improve the problem of low temperature of the battery cell assembly 10, and improve the thermal management performance of the battery device 100.

[0155] Here, the heat exchange component 30 can be disposed in the first receiving cavity 23, that is, the heat exchange component 30 can be in direct contact with the battery cell assembly 10, thereby further improving the heat exchange efficiency between the heat exchange component 30 and the battery cell assembly 10.

[0156] Of course, in other embodiments, a heat exchange assembly 30 may be provided on the outside of the first receiving cavity 23.

[0157] That is, at least a portion of the heat exchange components 30 are disposed on the outside of the first receiving cavity 23, so as to separate the heat exchange components 30 from the battery cell assembly 10.

[0158] In this embodiment, by providing a heat exchange component 30 on the outside of the first receiving cavity 23, the heat exchange component 30 is separated from the battery cell assembly 10, reducing the risk of the heat exchange medium of the heat exchange component 30 coming into contact with the battery cell assembly 10 after leakage, thereby reducing the risk of short circuit of the battery device 100 and improving the reliability of the battery device 100.

[0159] The housing assembly 20 is used to house the battery cell assembly 10, and the housing assembly 20 can have various structures. In some embodiments, referring to FIG2, the housing assembly 20 includes a housing body 21, which may include a first housing portion 211 and a second housing portion 212. The first housing portion 211 and the second housing portion 212 cover each other, and the first housing portion 211 and the second housing portion 212 together define a first receiving cavity 23 for housing the battery cell assembly 10. The second housing portion 212 may be a hollow structure with one end open, and the first housing portion 211 is a plate-like structure. The first housing portion 211 covers the open side of the second housing portion 212 to form a housing body 21 with the first receiving cavity 23; the first housing portion 211 and the second housing portion 212 may also be hollow structures with one side open, and the open side of the first housing portion 211 covers the open side of the second housing portion 212 to form a housing body 21 with the first receiving cavity 23. Of course, the first box portion 211 and the second box portion 212 can be of various shapes, such as cylinders, cuboids, etc.

[0160] To improve the sealing performance after the first housing part 211 and the second housing part 212 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 211 and the second housing part 212.

[0161] Assuming that the first box part 211 covers the top of the second box part 212, the first box part 211 can also be called the upper box cover, and the second box part 212 can also be called the lower box cover.

[0162] In other embodiments, the housing assembly 20 includes a housing body 21 and a bottom protective plate 22. A second receiving cavity 24 is formed between the bottom protective plate 22 and the outer side wall of the housing body 21. A heat exchange assembly 30 is disposed within the second receiving cavity 24.

[0163] It should be noted that the bottom guard plate 22 can be located at the bottom of the box body 21, in which case the bottom guard plate 22 is, for example, a bottom guard plate 22. The bottom guard plate 22 can also be located at the top of the box body 21, or it can be located on the side of the box body 21.

[0164] For example, please refer to Figures 2 to 7. The housing assembly 20 includes a housing body 21 and a bottom guard plate 22. The housing body 21 includes a first housing portion 211 and a second housing portion 212. A first receiving cavity 23 is formed between the first housing portion 211 and the second housing portion 212. A second receiving cavity 24 is formed between the bottom guard plate 22 and the second housing portion 212. A heat exchange assembly 30 is disposed in the second receiving cavity 24.

[0165] Here, the provision of heat exchange component 30 in the second receiving cavity 24 means that the heat exchange component 30 can be provided only in the second receiving cavity 24, or the heat exchange component 30 can be provided in other areas besides the second receiving cavity 24.

[0166] A second receiving cavity 24 is formed between the bottom protective plate 22 and the second housing part 212, that is, the first receiving cavity 23 and the second receiving cavity 24 are separated.

[0167] Here, by setting the bottom guard plate 22, the heat exchange component 30 can be supported and protected.

[0168] The heat exchange component 30 is disposed in the second receiving cavity 24, that is, the heat exchange component 30 is disposed outside the first receiving cavity 23, so as to separate the heat exchange component 30 from the battery cell assembly 10, avoid the heat exchange medium of the heat exchange component 30 from contacting the battery cell assembly 10, thereby preventing the battery device 100 from short-circuiting and improving the reliability of the battery device 100.

[0169] In this embodiment, a bottom protective plate 22 is provided on the outside of the housing body 21, defining a second receiving cavity 24 between the bottom protective plate 22 and the second housing part 212. A heat exchange assembly 30 is disposed within the second receiving cavity 24 for heat exchange with the housing body 21, thereby achieving heat exchange for the battery cell assembly 10 carried within the housing body 21. In other words, by placing the heat exchange assembly 30 on the outside of the first receiving cavity 23 of the housing assembly 20, the problem of short circuit in the battery device 100 due to leakage of the heat exchange medium from the heat exchange assembly 30 can be avoided to a certain extent, improving the reliability of the battery device 100 and increasing the utilization rate of the internal receiving cavity of the housing assembly 20, thus improving the compactness of the battery device 100. On the other hand, by providing the bottom protective plate 22, which cooperates with the housing body 21 to connect and protect the battery cell assembly 10, the reliability of the housing assembly 20 is further improved.

[0170] In some embodiments, as shown in Figures 2 to 7, a portion of the bottom protective plate 22 protrudes to form a connecting portion 221, which is sealed to the second housing portion 212.

[0171] A portion of the bottom guard plate 22 protrudes to form a connecting part 221, which is used to connect with the second housing part 212.

[0172] For example, the edge of the bottom guard plate 22 protrudes to form a ring of connecting portions 221, that is, the outermost ring of the bottom guard plate 22 protrudes to form a ring of connecting portions 221.

[0173] The specific manner in which the connecting part 221 is connected to the second housing part 212 is not limited here. For example, the connecting part 221 and the second housing part 212 are fastened together by bolts, screws or rivets.

[0174] In this embodiment, by forming a protruding connecting portion 221, a second receiving cavity 24 is defined between the bottom protective plate 22 and the second housing portion 212, while simultaneously connecting with the second housing portion 212. Furthermore, the sealing connection between the connecting portion 221 and the second housing portion 212 effectively prevents mud, sand, or water from entering the second receiving cavity 24, thus protecting the heat exchange assembly 30 within the second receiving cavity 24.

[0175] In some embodiments, the housing assembly 20 further includes a seal that is sealed between the connecting portion 221 and the second housing portion 212.

[0176] For example, the seal is a sealing strip.

[0177] In this embodiment, by providing a sealing element and sealing the sealing element between the connecting part 221 and the second housing part 212, that is, by sealing the gap between the connecting part 221 and the second housing part 212, it is further beneficial to prevent mud or water from entering the second receiving cavity 24, thereby improving the sealing performance between the bottom guard plate 22 and the second housing part 212.

[0178] In some embodiments, as shown in Figures 2 to 7, a portion of the bottom guard plate 22 protrudes to form a limiting structure 222. The limiting structure 222 is used to support the flexible member 31 and / or the second housing portion 212.

[0179] Here, "the limiting structure 222 is used to support the flexible member 31 and / or the second housing portion 212" means that the limiting structure 222 abuts against the flexible member 31 and / or the second housing portion 212, providing a certain supporting force to the flexible member 31 and / or the second housing portion 212. That is to say, the limiting structure 222 can be used to support the flexible member 31, or it can be used to support the second housing portion 212, or it can be used to support both the flexible member 31 and the second housing portion 212.

[0180] It should be noted that the bottom guard plate 22 protrudes in a certain area to form a limiting structure 222. This can mean that the side of the bottom guard plate 22 away from the box body 21 is recessed, so that the side of the bottom guard plate 22 facing the box body 21 protrudes to form a limiting structure 222; or the side of the bottom guard plate 22 away from the box body 21 is not recessed, and the side of the bottom guard plate 22 facing the box body 21 is thickened and protrudes to form a limiting structure 222.

[0181] The limiting structure 222 is used to support the flexible member 31 and / or the second housing part 212 so that a fixed space is formed between the bottom guard plate 22 and the second housing part 212, which helps to improve the reliability of the battery device 100.

[0182] In this embodiment, the bottom protective plate 22 is provided with a limiting structure 222 to support the flexible member 31 and / or the second housing part 212. This helps to improve the problem of deformation of the second housing part 212 due to insufficient support strength under pressure. This can improve the problem of the second housing part 212 directly contacting the heat exchange component 30 and causing the heat exchange component 30 to collapse. This helps to improve the stability of the thermal interface contact of the heat exchange component 30, thereby improving the thermal management performance of the heat exchange component 30.

[0183] In some embodiments, the limiting structure 222 abuts the flexible member 31 against the second housing portion 212 to support the flexible member 31 and the second housing portion 212.

[0184] For example, in an embodiment where the limiting structure 222 is used to support the flexible member 31, the limiting structure 222 may support the surface of the flexible member 31 and abut the flexible member 31 against the second housing portion 212.

[0185] In this embodiment, the flexible component 31 is abutted against the second housing part 212 by setting the limiting structure 222. While supporting the second housing part 212, the heat exchange component 30 can also be fixed, thereby improving the stability of the heat exchange component 30.

[0186] In some embodiments, please continue to refer to Figures 2 to 7, the heat exchange assembly 30 is provided with a clearance hole 33, and the limiting structure 222 passes through the clearance hole 33 to abut against the second housing portion 212.

[0187] Here, the heat exchange component 30 is provided with a clearance hole 33, that is, the flexible component 31 is provided with a clearance hole 33, and the clearance hole 33 penetrates through the opposite sides of the heat exchange component 30 in the thickness direction.

[0188] It should be noted that the clearance hole 33 must avoid the medium flow channel 32.

[0189] The specific location and number of clearance holes 33 are not limited here. They will be determined based on the specific circumstances.

[0190] For example, in an embodiment where the limiting structure 222 is used to support the second housing portion 212, the heat exchange assembly 30 may be provided with a clearance hole 33 to allow the limiting structure 222 to pass through the clearance hole 33 and abut against the second housing portion 212.

[0191] In this embodiment, the heat exchange component 30 avoids the limiting structure 222 by setting the avoidance hole 33. The limiting structure 222 passes through the avoidance hole 33 to abut against the second housing part 212. While supporting the second housing part 212, it can also position the heat exchange component 30, thereby improving the stability of the heat exchange component 30.

[0192] In some embodiments, referring to Figures 4 and 5, at least two flexible members 31 include a hot-pressed region 34. The hot-pressed region 34 is configured such that at least two flexible members 31 are formed by hot pressing. The hot-pressed region 34 divides the heat exchange assembly 30 to form at least one medium flow channel 32.

[0193] Here, the flexible component 31 is sealed by hot pressing. The hot pressing process can effectively ensure that the heat exchange component 30 has good sealing performance and is not easy to crack.

[0194] In this embodiment, the flexible component 31 is sealed by a hot pressing process, that is, a hot pressing region 34 is formed by hot pressing. The hot pressing region 34 divides the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0195] It should be noted that the specific structure of the first insulation layer 38 is not limited here.

[0196] In some embodiments, please refer to Figures 8 to 10, an insulating cavity 39 is provided inside the first insulating layer 38.

[0197] In this embodiment, a heat-insulating cavity 39 is provided inside the first heat-insulating layer 38. The cavity facilitates heat exchange between the heat exchange medium in the medium flow channel 32 and the external environment, thus providing insulation for the battery cell assembly 10 and addressing the issue of low external temperature of the battery cell assembly 10. Furthermore, the heat-insulating cavity 39 also acts as a buffer, providing a certain degree of protection and increasing the impact resistance of the battery device 100.

[0198] In some embodiments, the heat insulation cavity 39 is filled with a heat insulation medium, the thermal conductivity of which is lower than that of the first heat insulation layer 38.

[0199] Here, the specific type of insulation medium is not limited, as long as its thermal conductivity is lower than that of the first insulation layer 38.

[0200] In this embodiment, by filling the heat insulation cavity 39 with a heat insulation medium, it is beneficial to improve the heat exchange between the heat exchange medium in the medium flow channel 32 and the external environment, that is, to keep the battery cell assembly 10 warm and improve the problem of low temperature around the battery cell assembly 10.

[0201] It should be noted that there are multiple possible locations for the first insulation layer 38.

[0202] In some embodiments, as shown in Figures 8 to 10, a first heat insulation layer 38 is disposed on the periphery of the heat exchange layer 37. The heat exchange layer 37 includes at least two flexible members 31, and a medium flow channel 32 is formed between the at least two flexible members 31.

[0203] Here, the first heat insulation layer 38 being disposed around the heat exchange layer 37 means that either a ring of the first heat insulation layer 38 is formed around the heat exchange layer 37, or a portion of the area around the heat exchange layer 37 is provided with the first heat insulation layer 38.

[0204] It should be noted that the first heat insulation layer 38 and the heat exchange layer 37 can be an integrally formed structure, that is, the first heat insulation layer 38 and the heat exchange layer 37 are made of the same material. For example, the first heat insulation layer 38 can be a heat insulation cavity 39 formed around the periphery of the heat exchange layer 37. The first heat insulation layer 38 and the heat exchange layer 37 can also be a separate structure, that is, the first heat insulation layer 38 and the heat exchange layer 37 can be made of different materials. For example, the thermal conductivity of the first heat insulation layer 38 can be set to be lower than that of the heat exchange layer 37.

[0205] In this embodiment, by placing the first heat insulation layer 38 on the periphery of the heat exchange layer 37, the problem of heat loss from the battery device 100 to the periphery through the heat exchange layer 37 is mitigated, thereby improving the heat insulation effect of the battery device 100. Furthermore, by making the heat exchange layer 37 from a flexible element 31, the lighter weight of the flexible element 31 helps reduce the weight of the battery device 100, lowers the production cost of the heat exchange assembly 30, and improves the energy density of the battery device 100. Moreover, the flexible element 31 has electrical insulation properties, eliminating the need for insulation treatment, which helps reduce the risk of leakage and production costs of the battery device 100, thereby improving the reliability of the battery device 100.

[0206] In some embodiments, as shown in Figures 8 to 10, a thermal insulation cavity 39 is formed between at least two flexible members, and the thermal insulation cavity 39 is located on the periphery of the medium flow channel 32.

[0207] Here, the statement that the heat insulation cavity 39 is located around the medium flow channel 32 means that a heat insulation cavity 39 can be formed around the medium flow channel 32, or a heat insulation cavity 39 can be formed in a part of the area around the medium flow channel 32.

[0208] In this embodiment, by placing the heat insulation cavity 39 on the periphery of the heat exchange layer 37, it is beneficial to improve the problem of heat loss from the battery device 100 to the periphery through the heat exchange layer 37, thereby improving the heat preservation effect of the battery device 100. Furthermore, the flexible element can form the heat insulation cavity 39 simultaneously with the formation of the medium flow channel 32, which helps reduce molding difficulty. In addition, by making the heat exchange layer 37 out of a flexible element 31, the lightweight nature of the flexible element 31 helps to reduce the weight of the battery device 100, lower the production cost of the heat exchange assembly 30, and improve the energy density of the battery device 100. Moreover, the flexible element 31 has electrical insulation properties, eliminating the need for insulation treatment, which helps to reduce the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0209] In some embodiments, as shown in Figures 8 to 10, a first heat insulation layer 38 is disposed on the side of the heat exchange layer 37 facing away from the battery cell assembly 10.

[0210] In other words, the heat exchange layer 37 is located between the battery cell assembly 10 and the first heat insulation layer 38.

[0211] For example, if the heat exchange layer 37 is disposed at the bottom of the battery cell assembly 10, the first heat insulation layer 38 is located at the bottom of the heat exchange layer 37, which is beneficial to increasing the coverage area of ​​the first heat insulation layer 38 over the heat exchange layer 37, thereby improving the heat preservation effect of the first heat insulation layer 38.

[0212] Of course, in other embodiments, the first heat insulation layer 38 may also be disposed on the top of the battery cell assembly 10 or on the side of the battery cell assembly 10.

[0213] It should be noted that there are several ways to place the first heat insulation layer 38 on the side of the heat exchange layer 37 away from the battery cell assembly 10.

[0214] In some embodiments, the heat exchange layer 37 and the first heat insulation layer 38 together define a medium flow channel 32.

[0215] Here, the thermal conductivity of the first insulation layer 38 is lower than that of the heat exchange layer 37. The first insulation layer 38 is used to achieve the function of heat preservation, and the heat exchange layer 37 is used to achieve the function of heat exchange with the battery cell assembly 10.

[0216] It is understandable that the heat exchange layer 37 is a flexible structure, while the first insulation layer 38 can be either a flexible or non-flexible structure.

[0217] In this embodiment, the medium flow channel 32 is defined by the heat exchange layer 37 and the first heat insulation layer 38. That is, the heat exchange medium flows between the heat exchange layer 37 and the first heat insulation layer 38, and exchanges heat with the battery cell assembly 10 through the heat exchange layer 37 on the side closer to the battery cell assembly 10, while the first heat insulation layer 38 on the side farther away from the battery cell assembly 10 can play a heat preservation role. This structure is simple.

[0218] In other embodiments, please refer to FIG10, the heat exchange layer 37 includes at least two flexible elements 31, and a medium flow channel 32 is formed between the at least two flexible elements 31.

[0219] In other words, the medium flow channel 32 in this embodiment is not defined by the heat exchange layer 37 and the first heat insulation layer 38, but is formed by the heat exchange layer 37.

[0220] In this embodiment, the medium flow channel 32 is defined by the heat exchange layer 37, that is, the heat exchange medium flows in the heat exchange layer 37 and exchanges heat with the battery cell assembly 10, while the first heat insulation layer 38 located on the side of the heat exchange layer 37 away from the battery cell assembly 10 can play a heat preservation role. The structure is simple.

[0221] In some embodiments, please continue to refer to FIG10, an insulating cavity 39 is provided between the first insulating layer 38 and the flexible member 31.

[0222] In other words, a heat insulation cavity 39 is provided between the first heat insulation layer 38 and the heat exchange layer 37.

[0223] Here, the thermal conductivity of the first insulation layer 38 can be lower than that of the heat exchange layer 37, or it can be equal to that of the heat exchange layer 37.

[0224] In this embodiment, a heat-insulating cavity 39 is provided between the first heat-insulating layer 38 and the flexible member 31. The heat-insulating cavity 39 facilitates heat exchange between the heat exchange medium within the medium flow channel 32 and the external environment, thus providing insulation for the battery cell assembly 10 and mitigating the problem of low external temperature of the battery cell assembly 10. Furthermore, the heat-insulating cavity 39 also acts as a buffer, providing a certain degree of protection and increasing the impact resistance of the battery device 100. Moreover, since the thermal conductivity of the first heat-insulating layer 38 is lower than that of the heat exchange layer 37, the insulation effect of the heat exchange assembly 30 is further improved.

[0225] In some embodiments, the heat insulation cavity 39 is filled with a heat insulation medium, the thermal conductivity of which is lower than that of the first heat insulation layer 38.

[0226] Here, the specific type of insulation medium is not limited, as long as its thermal conductivity is lower than that of the first insulation layer 38.

[0227] In this embodiment, by filling the heat insulation cavity 39 with a heat insulation medium, it is further beneficial to improve the heat exchange between the heat exchange medium in the medium flow channel 32 and the external environment, that is, to play a heat preservation role for the battery cell assembly 10, and further improve the problem of low temperature around the battery cell assembly 10.

[0228] It should be noted that the specific material of the first insulation layer 38 is not limited here.

[0229] In some embodiments, the first thermal insulation layer 38 is configured as a flexible structure.

[0230] In this embodiment, by also configuring the first heat insulation layer 38 as a flexible structure, that is, by configuring both the first heat insulation layer 38 and the heat exchange layer 37 as flexible structures, the heat exchange component 30 can better fit with the housing component 20 and / or the battery cell component 10. This facilitates the absorption of assembly tolerances of the heat exchange component 30, eliminates the need for sealant or thermally conductive materials, improves the fit between the heat exchange component 30 and the housing component 20 and / or the battery cell component 10, and increases the effective heat exchange area between the heat exchange component 30 and the housing component 20 and / or the battery cell component 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30. Simultaneously, it also facilitates better fit between the first heat insulation layer 38 and the housing component 20 and / or the bottom protective plate 22, thereby improving the heat insulation effect of the heat exchange component 30.

[0231] In some embodiments, the thermal conductivity of the first insulation layer 38 is lower than that of the heat exchange layer 37.

[0232] In this embodiment, by setting the thermal conductivity of the first insulation layer 38 to be lower than that of the heat exchange layer 37, it is beneficial to further improve the heat preservation effect of the heat exchange component 30.

[0233] In some embodiments, referring to Figures 2 to 5, a first heat insulation layer 38 and a heat exchange layer 37 are stacked. The first heat insulation layer 38 is located on the side of the heat exchange layer 37 facing away from the battery cell assembly 10. A flange 40 is formed on the edge of the heat exchange assembly 30, and the flange 40 surrounds the periphery of the battery cell assembly 10 or the housing assembly 20.

[0234] In other words, the heat exchange component 30 is constructed by stacking a first insulation layer 38 and a heat exchange layer 37.

[0235] The flange 40 surrounds the periphery of the battery cell assembly 10 or the housing assembly 20, forming a boat-shaped structure similar to the flange 40. For example, in an embodiment where the heat exchange assembly 30 is disposed within the first receiving cavity 23, the flange 40 surrounds the periphery of the battery cell assembly 10. In this case, the first heat insulation layer 38 encloses the heat exchange layer 37 between the first heat insulation layer 38 and the battery cell assembly 10.

[0236] In an embodiment where the heat exchange assembly 30 is disposed within the second receiving cavity 24, the flange 40 surrounds the periphery of the housing assembly 20. In this case, the first heat insulation layer 38 encloses the heat exchange layer 37 between the first heat insulation layer 38 and the housing assembly 20.

[0237] Here, the flange 40 can be a heat insulation cavity 39 or a heat insulation medium with low thermal conductivity can be filled in the heat insulation cavity 39 to improve the side protection performance of the battery device 100.

[0238] In this embodiment, by forming a flange 40 on the edge of the heat exchange component 30, and the flange 40 surrounding the periphery of the battery cell assembly 10 or the housing assembly 20, the heat preservation performance is further improved, and the side protection performance of the battery device 100 is also improved.

[0239] In some embodiments, at least two flexible elements 31 are configured as metal plasticized films.

[0240] The flexible component 31 is a single-layer or multi-layer thin film.

[0241] Here, the metal plastic film is a metal-plastic composite material, which includes a metal layer and a plastic layer.

[0242] In this embodiment, because the metal plasticized film is thin and lightweight, and because a medium flow channel 32 is formed between at least two metal plasticized films, it is not affected by the extrusion process and does not need to meet a large thickness requirement. Therefore, the overall thickness and weight of the heat exchange assembly 30 can be reduced. Simultaneously, because the heat exchange assembly 30 has insulating properties, the risk of insulation failure can be reduced. This also reduces the risk of the heat exchange assembly 30 reacting with the internally flowing heat exchange medium, further reducing the risk of heat exchange medium corrosion and leakage.

[0243] For example, at least two flexible elements 31 are configured as aluminum-plastic films.

[0244] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0245] In some embodiments, the flexible member 31 has a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, which are stacked sequentially.

[0246] Here, the flexible component 31 includes a metal layer and a non-metal layer, that is, a composite material component composed of a metal layer and a non-metal layer.

[0247] For example, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0248] Here, there is no limit to the number of metal layers and non-metal layers.

[0249] In this embodiment, the flexible element 31, which is composed of sequentially stacked metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel 32 between at least two flexible elements 31, it is unaffected by the extrusion process and does not need to meet large thickness requirements, thus reducing the overall thickness and weight of the heat exchange assembly 30. In addition, the heat exchange assembly 30 does not react with the internally flowing heat exchange medium, therefore there is no risk of corrosion or leakage.

[0250] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0251] By setting the metal layer to one or more of aluminum foil, copper foil, and steel foil, the flexible component 31 can have a certain structural strength and can play an isolation role.

[0252] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyvinyl chloride, and polyethylene.

[0253] By setting the non-metallic layer to one or more of polypropylene, polyvinyl chloride and polyethylene, the flexible component 31 can have a certain waterproof function.

[0254] For example, a non-metallic layer of corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or additives can be added to the non-metallic layer to make the non-metallic layer resistant to acid and alkali corrosion.

[0255] In some embodiments, the non-metallic layer is a hot-melt layer.

[0256] Here, by setting the non-metallic layer as a hot-melt layer, that is, a hot-melt material, it is advantageous to combine the non-metallic layer and the metallic layer together through hot melting, which is simple to form and has high production efficiency.

[0257] In some embodiments, the flexible member 31 has a layered structure, and the flexible member 31 includes a corrosion-resistant layer, an isolation layer and a waterproof layer arranged sequentially, with the waterproof layer being closer to the medium flow channel 32 than the corrosion-resistant layer.

[0258] Here, the corrosion-resistant layer can be a nylon layer made of nylon material, which has certain corrosion resistance properties, such as resistance to acid and alkali corrosion.

[0259] The isolation layer can be a metal layer, which can be one or more of aluminum foil, copper foil and steel foil, so that the flexible part 31 has a certain structural strength and can play an isolation role.

[0260] The waterproof layer can be a non-metallic layer, which can be one or more of polypropylene, polyvinyl chloride and polyethylene, so that the flexible part 31 can have a certain waterproof function.

[0261] In this embodiment, by configuring the flexible component 31 to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, the waterproof layer is closer to the medium flow channel 32 than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange component 30.

[0262] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0263] The thickness of the isolation layer can be any one of the following values ​​or any value between two of the following: 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, and 100μm.

[0264] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-100μm, the flexible component 31 can have a certain structural strength and flexibility.

[0265] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0266] The thickness of the isolation layer can be any one of the following values, or any value between two of the following: 6.5μm, 7μm, 7.5μm, 7.8μm, 8μm, 8.3μm, 8.5μm, 8.8μm, 9μm, 9.2μm, 9.5μm, 9.7μm, 10μm, 10.3μm, 10.5μm, 10.8μm, 11μm, 11.5μm, 11.8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, and 15μm.

[0267] In this embodiment, by setting the thickness of the isolation layer to 6.5μm-15μm, the flexible component 31 can be further made to have a certain structural strength and flexibility.

[0268] In some embodiments, the thickness of the corrosion-resistant layer is 5μm-20μm.

[0269] The thickness of the corrosion-resistant layer can be 5μm, 5.5μm, 5.8μm, 6μm, 6.5μm, 7μm, 7.5μm, 7.8μm, 8μm, 8.3μm, 8.5μm, 8.8μm, 9μm, 9.2μm, 9.5μm, 9.7μm, 10μm, 10.3μm, 10.5μm, 10.8μm, 11μm, 11.5μm, 11. Point values ​​of any one of the following: 8μm, 12μm, 12.3μm, 12.5μm, 13μm, 13.5μm, 14μm, 14.5μm, 15μm, 15.5μm, 16μm, 16.5μm, 17μm, 17.5μm, 18μm, 18.5μm, 18.7μm, 19μm, 19.5μm, and 20μm, or point values ​​between any two.

[0270] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5μm-20μm, the wear resistance and toughness of the flexible component 31 can be improved.

[0271] In some embodiments, the thickness of the waterproof layer is 50μm-120μm.

[0272] The thickness of the waterproof layer can be any one of the following values ​​or any combination of two: 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, and 120μm.

[0273] In this embodiment, by setting the thickness of the waterproof layer to 50μm-120μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate the hot pressing connection of the flexible component 31 through the waterproof layer.

[0274] In some embodiments, as shown in Figures 2 to 5, the thickness of the flexible element 31 is 0.05 mm to 0.3 mm.

[0275] For example, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.15mm, 0.2mm, 0.21mm, 0.22mm, 0.25mm, 0.27mm, 0.28mm, 0.3mm, etc.

[0276] In this embodiment, by setting the thickness of the flexible element 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible element 31 has a certain structural strength while the overall thickness of the heat exchange component 30 is small, which is beneficial to reduce the overall volume and weight of the battery device 100 and increase the energy density of the battery device 100.

[0277] In some embodiments, as shown in Figures 2 to 5, the thickness of the flexible element 31 is 0.08 mm to 0.2 mm.

[0278] For example, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc.

[0279] In this embodiment, by setting the thickness of the flexible element 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible element 31 has a certain structural strength, while further reducing the overall thickness of the heat exchange component 30. This is beneficial to further reduce the overall volume and weight of the battery device 100, thereby further increasing the energy density of the battery device 100.

[0280] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0281] For example, the elastic modulus of the flexible component 31 can be any one of 0.1MPa, 1MPa, 50MPa, 100MPa, 150MPa, 200MPa, 300MPa, 500MPa, 800MPa, 1000MPa, 1300MPa, 1500MPa, 1800MPa, 2000MPa, 2500MPa, 2800MPa, 3000MPa, 3500MPa, 4000MPa, 4500MPa, 5000MPa, 5500MPa, 6000MPa, 6500MPa, 7000MPa, 7500MPa, 8000MPa, 8500MPa, 8800MPa, 9000MPa, 9500MPa, 9700MPa, and 10000MPa, or a value between any two.

[0282] The elastic modulus describes the magnitude of a unit strain caused by a unit stress when a solid is subjected to force within a certain range; it is one of the fundamental physical quantities of materials. The larger the elastic modulus, the greater the stiffness and compressive strength of the material. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0283] In this embodiment, by setting the elastic modulus of the flexible component 31 to 0.1MPa-10000MPa, the flexible component 31 is made to have a certain structural strength, which improves the reliability of the heat exchange component 30, and also has a certain deformation capability. This can improve the fit between the heat exchange component 30 and the housing component 20 and / or the battery component battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the housing component 20 and / or the battery component battery cell component 10, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0284] It should be noted that the thickness and elastic modulus of the flexible component 31 can be measured using a micrometer, force gauge, or vernier caliper.

[0285] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0286] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A battery device, comprising: The housing assembly has a first receiving cavity inside; A battery cell assembly is disposed within the first receiving cavity; A heat exchange assembly, comprising a heat exchange layer and a first heat insulation layer; the heat exchange layer is a flexible structure and is configured to exchange heat with the battery cell assembly; The first heat insulation layer is disposed between the heat exchange layer on the side away from the battery cell assembly and the housing assembly.

2. The battery device according to claim 1, wherein, The first insulation layer has an insulation cavity inside.

3. The battery device according to claim 2, wherein, The heat insulation cavity is filled with a heat insulation medium, and the thermal conductivity of the heat insulation medium is lower than that of the first heat insulation layer.

4. The battery device according to claim 1, wherein, The heat exchange layer and the first heat insulation layer together define a medium flow channel, which is used to conduct the heat exchange medium.

5. The battery device according to claim 1, wherein, The heat exchange layer includes at least two flexible elements, which are stacked and a medium flow channel is formed between them. The medium flow channel is used to conduct the heat exchange medium.

6. The battery device according to claim 5, wherein, A heat insulation cavity is provided between the first heat insulation layer and the flexible component.

7. The battery device according to claim 6, wherein, The heat insulation cavity is filled with a heat insulation medium, and the thermal conductivity of the heat insulation medium is lower than that of the first heat insulation layer.

8. The battery device according to claim 5, wherein, A thermal insulation cavity is formed between the at least two flexible members, and the thermal insulation cavity is located on the periphery of the medium flow channel.

9. The battery device according to any one of claims 1-8, wherein, The first insulation layer is configured as a flexible structure.

10. The battery device according to any one of claims 1-9, wherein, The thermal conductivity of the first insulation layer is lower than that of the heat exchange layer.

11. The battery device according to any one of claims 1-10, wherein, The heat exchange assembly further includes a second heat insulation layer, wherein the first heat insulation layer is folded towards the side of the battery cell assembly to form the second heat insulation layer.

12. The battery device according to any one of claims 1-11, wherein, The first heat insulation layer is stacked with the heat exchange layer, and the first heat insulation layer is located on the side of the heat exchange layer away from the battery cell assembly; the edge of the heat exchange assembly is formed with a flange, and the flange surrounds the periphery of the battery cell assembly or the housing assembly.

13. The battery device according to any one of claims 5-8, wherein, The at least two flexible components are configured as metal plasticized films.

14. The battery device according to claim 13, wherein, The at least two flexible components are configured as aluminum-plastic films.

15. The battery device according to any one of claims 5-8, wherein, The flexible component has a layered structure, comprising a metal layer and a non-metal layer, which are stacked sequentially.

16. The battery device according to claim 15, wherein, The metal layer includes one or more of aluminum foil, copper foil, and steel foil.

17. The battery device according to claim 15 or 16, wherein, The non-metallic layer includes one or more of polypropylene, polyvinyl chloride, and polyethylene.

18. The battery device according to any one of claims 15-17, wherein, The non-metallic layer is a hot-melt layer.

19. The battery device according to any one of claims 5-8, wherein, The flexible component has a layered structure, comprising a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged sequentially, wherein the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

20. The battery device according to claim 19, wherein, The thickness of the isolation layer is 6.5μm-100μm.

21. The battery device according to claim 20, wherein, The thickness of the isolation layer is 6.5μm-15μm.

22. The battery device according to any one of claims 19-21, wherein, The thickness of the corrosion-resistant layer is 5μm-20μm.

23. The battery device according to any one of claims 19-22, wherein, The thickness of the waterproof layer is 50μm-120μm.

24. The battery device according to any one of claims 5-8, wherein, The thickness of the flexible component is 0.05mm-0.3mm.

25. The battery device according to claim 24, wherein, The thickness of the flexible component is 0.08mm-0.2mm.

26. The battery device according to any one of claims 5-8, wherein, The elastic modulus of the flexible component is 0.1 MPa-10000 MPa.

27. A heat exchange component, wherein the heat exchange component is the heat exchange component of the battery device according to any one of claims 1-26, the heat exchange component being used to exchange heat with the battery cell assembly.

28. An electrical device comprising a battery device according to any one of claims 1-26 or a heat exchange assembly according to claim 27.

29. An energy storage device comprising a battery device according to any one of claims 1-26 or a heat exchange assembly according to claim 27.

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