Heat exchange assembly, battery device, electric equipment and energy storage equipment

Abstract

The embodiment of the utility model provides a heat exchange assembly, a battery device, electric equipment and energy storage equipment. The battery device comprises a box body assembly, a battery monomer assembly and a heat exchange assembly, a first containing cavity is formed in the box body assembly. And the battery monomer assembly is arranged in the first accommodating cavity. And the heat exchange assembly is used for exchanging heat with the battery monomer assembly. The heat exchange assembly comprises a heat exchange layer and a temperature equalizing layer, and the heat exchange layer uniformly exchanges heat with the battery monomer assembly through the temperature equalizing layer. According to the battery device provided by the embodiment of the invention, the heat exchange assembly comprises the heat exchange layer and the temperature equalizing layer, and the heat exchange layer uniformly exchanges heat with the battery monomer assembly through the temperature equalizing layer, that is, the heat exchange medium in the medium flow channel of the heat exchange layer can firstly exchange heat with the temperature equalizing layer; and the temperature equalizing layer exchanges heat with the battery device after equalizing the heat, so that the temperature difference of different areas of the battery device can be adjusted to a certain extent, and the thermal management performance and the temperature uniformity of the battery device are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a heat exchange component, a battery device, an electrical device, and an energy storage device. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] In new energy vehicles equipped with battery devices, the battery devices can be used to provide all or part of the power. During use, the battery cells within the battery device generate heat. Excessive heat generation can adversely affect the performance and service life of the battery device. Therefore, a heat dissipation system is typically provided to dissipate heat from the battery device. However, in related technologies, the temperature of different areas of the heat dissipation system and the heat generated by different areas of the battery device vary, resulting in poor temperature uniformity within the battery device. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a heat exchange component, a battery device, an electrical device, and an energy storage device, which can improve the problem of poor temperature uniformity of the battery device to a certain extent.

[0005] To achieve the above objectives, a first aspect of an embodiment of the present application provides a battery device, comprising:

[0006] The box assembly has a first accommodating cavity therein;

[0007] A battery cell assembly is disposed in the first accommodating cavity;

[0008] a heat exchange assembly, the heat exchange assembly being used to exchange heat with the battery monomer assembly;

[0009] The heat exchange assembly includes a heat exchange layer and a temperature-uniform layer, and the heat exchange layer uniformly exchanges heat with the battery cell assembly through the temperature-uniform layer.

[0010] The battery device provided in an embodiment of the present application includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed within a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly is configured to include a heat exchange layer and a temperature-equalizing layer. The heat exchange layer uniformly exchanges heat with the battery cell assembly through the temperature-equalizing layer. In other words, the heat exchange medium within the medium flow channel of the heat exchange layer can first exchange heat with the temperature-equalizing layer. After the temperature-equalizing layer has equalized the heat, it can then exchange heat with the battery device. In this way, the temperature differences between different areas of the battery device can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device.

[0011] In some embodiments, the temperature-uniform layer includes a plurality of temperature-uniform elements, and the thermal resistance of at least one of the temperature-uniform elements is different from that of the other temperature-uniform elements.

[0012] In this way, temperature-equalizing layers with different thermal resistances can be used in different areas of the battery cell assembly as needed, that is, the heat exchange assembly can be thermally managed in different zones, further improving the thermal management performance and temperature uniformity of the battery device.

[0013] In some embodiments, the battery cell assembly includes a first temperature zone and a second temperature zone, the temperature of the first temperature zone is higher than the temperature of the second temperature zone, and the thermal resistance of the temperature equalizer corresponding to the first temperature zone is lower than the thermal resistance of the temperature equalizer corresponding to the second temperature zone.

[0014] Specifically, by setting the thermal resistance of the temperature equalizer corresponding to the high-temperature area to be lower than the thermal resistance of the temperature equalizer corresponding to the low-temperature area, zoned thermal management of the battery device can be achieved. This is more conducive to heat exchange in the high-temperature area, that is, the temperature equalizer with low thermal resistance is more conducive to heat dissipation in the high-temperature area of the battery device, thereby making the temperature of the battery device more uniform, further improving the thermal management performance and temperature uniformity of the battery device.

[0015] In some embodiments, the heat exchange layer has a medium flow channel, which is used to conduct heat exchange medium; the thermal resistance of the temperature equalizer corresponding to the upstream area of the medium flow channel is higher than the thermal resistance of the temperature equalizer corresponding to the downstream area of the medium flow channel.

[0016] In order to achieve zoned thermal management of the battery device, this is more conducive to heat exchange in the downstream area of the medium flow channel, that is, the heat exchange efficiency between the low thermal resistance temperature equalizing component corresponding to the downstream area of the medium flow channel and the heat exchange medium is higher, thereby making the temperature of the battery device more uniform, further improving the thermal management performance and temperature uniformity of the battery device.

[0017] In some embodiments, the heat exchange assembly further includes an adhesive layer, and the heat exchange layer is bonded to the temperature uniformity layer via the adhesive layer.

[0018] In this embodiment, the heat exchange layer is bonded to the temperature-uniform layer via the adhesive layer, which is beneficial to improving the fit between the heat exchange layer and the flexible component, thereby facilitating improving the heat exchange efficiency and heat exchange effect.

[0019] In some embodiments, the heat exchange layer has a medium flow channel, which is used to conduct a heat exchange medium; the battery cell assembly includes a first temperature zone and a second temperature zone, the temperature of the first temperature zone is higher than the temperature of the second temperature zone, and the width of at least part of the medium flow channel corresponding to the first temperature zone is wider than the width of at least part of the medium flow channel corresponding to the second temperature zone.

[0020] In this embodiment, the width of the medium flow channel can be designed to be different according to the heat dissipation requirements of different areas of the battery device. For example, the width of the medium flow channel corresponding to the high-temperature area of the battery device is generally larger, and the width of the medium flow channel corresponding to the low-temperature area of the battery device is smaller. According to the temperature changes in different areas of the battery device, the flow of the heat exchange medium is distributed, the overall temperature of the battery device is accurately adjusted, the heat exchange efficiency and heat exchange effect of the heat exchange component are improved, and the thermal management performance and temperature uniformity of the battery device are improved.

[0021] In some embodiments, the thermal conductivity of the temperature-balancing layer is 0.1 W / (m·K)-200 W / (m·K).

[0022] The temperature-equalizing layer can balance the heat before exchanging heat with the battery device. In this way, the temperature difference between different areas of the battery device can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device.

[0023] In some embodiments, a refrigerant is provided inside the temperature-balancing layer.

[0024] In this embodiment, by providing a refrigerant inside the temperature-balancing layer, the heat exchange efficiency of the temperature-balancing layer is improved, thereby improving the heat exchange efficiency and temperature-balancing effect of the heat exchange component.

[0025] In some embodiments, the temperature-balanced layer is disposed on a side of the heat exchange layer close to the battery cell assembly.

[0026] That is to say, the temperature-equalizing layer is arranged between the heat exchange layer and the battery cell assembly. This is conducive to the heat exchange medium in the medium flow channel formed between the heat exchange layers to first exchange heat with the temperature-equalizing layer, and then the temperature-equalizing layer exchanges heat with the battery device after balancing the heat.

[0027] In some embodiments, the heat exchange layer includes at least two flexible members, which are stacked and at least one medium flow channel is formed between the flexible members. The at least one medium flow channel is used to conduct heat exchange medium.

[0028] In this embodiment, by setting the heat exchange layer to include at least two flexible parts, the flexible parts are lighter, which is beneficial to reducing the weight of the battery device, reducing the production cost of the heat exchange component, and improving the energy density of the battery device; by setting the flexible parts to be a flexible structure, the flexible parts are thinner and more flexible, and the flexible heat exchange unit has better bendability, so that it can be bent toward the adjacent heat exchange unit as needed, so that it can be close to and connected to the adjacent heat exchange units, to a certain extent facilitating the connection between the heat exchange units and reducing the occupied space; in addition, it can also make the heat exchange component fit better with the box component and / or the battery cell component, which is beneficial to absorb the assembly tolerance of the heat exchange component, without the need to use filler or thermal conductive material, improving the fit between the heat exchange component and the box component and / or the battery cell component, and increasing the effective heat exchange area between the heat exchange component and the box component and / or the battery cell component, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0029] In some embodiments, the at least two flexible members are configured as metal plasticized films.

[0030] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow channel formed between at least two metal-plasticized films, are unaffected by the extrusion process and eliminate the need for strict thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly's insulating properties prevent the risk of insulation failure. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0031] In some embodiments, the at least two flexible members are configured as aluminum-plastic films.

[0032] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0033] In some embodiments, the flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0034] In this embodiment, the flexible member, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel between at least two flexible members, it is unaffected by the extrusion process and eliminates the need for strict thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0035] In some embodiments, the metal layer includes one of aluminum foil, copper foil and steel foil.

[0036] The flexible part can have a certain structural strength and can play an isolation role.

[0037] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0038] The flexible part can be made waterproof to a certain extent.

[0039] In some embodiments, the non-metallic layer is a hot-melt layer.

[0040] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0041] In some embodiments, the flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

[0042] In this embodiment, by configuring the flexible member to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, the waterproof layer is closer to the medium flow channel than the corrosion-resistant layer, which is beneficial to improving the reliability of the heat exchange component.

[0043] In some embodiments, the thickness of the isolation layer is 6.5 μm-100 μm.

[0044] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-100 μm, the flexible member can have a certain structural strength and flexibility.

[0045] In some embodiments, the thickness of the isolation layer is 6.5 μm-15 μm.

[0046] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-15 μm, the flexible member can further have a certain structural strength and flexibility.

[0047] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm-20 μm.

[0048] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5 μm-20 μm, the wear resistance and toughness of the flexible component can be improved.

[0049] In some embodiments, the waterproof layer has a thickness of 50 μm-120 μm.

[0050] In this embodiment, by setting the thickness of the waterproof layer to 50 μm-120 μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible parts through the waterproof layer.

[0051] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0052] By setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while the overall thickness of the heat exchange component is smaller, which is beneficial to reducing the overall volume and weight of the battery to increase the energy density of the battery.

[0053] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0054] By setting the thickness of the flexible part to 0.08mm-0.2mm, the heat exchange component made of the flexible part has a certain structural strength, while the overall thickness of the heat exchange component is further reduced, which is conducive to further reducing the overall volume and weight of the battery, thereby further increasing the energy density of the battery.

[0055] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0056] In this embodiment, by setting the elastic modulus of the flexible member to 0.1 MPa-10,000 MPa, the flexible member has a certain structural strength, improving the reliability of the heat exchange assembly, and has a certain degree of deformation ability, which can improve the fit between the heat exchange assembly and the box assembly and / or the battery assembly battery cell assembly, thereby increasing the effective heat exchange area between the heat exchange assembly and the box assembly and / or the battery assembly battery cell assembly, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly. In some embodiments, the at least two flexible members include a hot pressing region, and the hot pressing region is configured such that the at least two flexible members are formed by hot pressing, and the hot pressing region separates the heat exchange assembly to form the at least one medium flow channel.

[0057] In some embodiments, the at least two flexible members include a hot pressing region, wherein the hot pressing region is configured such that the at least two flexible members are formed by hot pressing, and the hot pressing region separates the heat exchange component to form the at least one medium flow channel.

[0058] In this embodiment, the flexible member is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing, and the hot pressing area separates the heat exchange component to form at least one medium flow channel. This molding method is simple.

[0059] A second aspect of an embodiment of the present application provides a heat exchange assembly, which is the heat exchange assembly of the battery device described above, and is used to exchange heat with the battery cell assembly.

[0060] The heat exchange assembly provided in the embodiment of the present application is used to exchange heat with a battery cell assembly. The heat exchange assembly is configured to include a heat exchange layer and a temperature-equalizing layer. The heat exchange layer evenly exchanges heat with the battery cell assembly through the temperature-equalizing layer. That is, the heat exchange medium in the medium flow channel of the heat exchange layer can first exchange heat with the temperature-equalizing layer, and the temperature-equalizing layer can balance the heat before exchanging heat with the battery device. In this way, the temperature difference between different areas of the battery device can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device.

[0061] A third aspect of an embodiment of the present application provides an electrical device, comprising the battery device or the heat exchange assembly described above.

[0062] The battery device of an electrical device provided in an embodiment of the present application includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed in a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly is configured to include a heat exchange layer and a temperature-equalizing layer. The heat exchange layer uniformly exchanges heat with the battery cell assembly through the temperature-equalizing layer. In other words, the heat exchange medium in the medium flow channel of the heat exchange layer can first exchange heat with the temperature-equalizing layer. After the temperature-equalizing layer has equalized the heat, it can then exchange heat with the battery device. In this way, the temperature differences between different areas of the battery device can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device.

[0063] A fourth aspect of an embodiment of the present application provides an energy storage device, comprising the battery device or the heat exchange assembly described above.

[0064] The battery device of the energy storage device provided in the embodiment of the present application includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed in a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly is configured to include a heat exchange layer and a temperature-equalizing layer. The heat exchange layer evenly exchanges heat with the battery cell assembly through the temperature-equalizing layer. In other words, the heat exchange medium in the medium flow channel of the heat exchange layer can first exchange heat with the temperature-equalizing layer. After the temperature-equalizing layer has equalized the heat, it can exchange heat with the battery device. In this way, the temperature difference between different areas of the battery device can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0066] Figure 2This is a schematic exploded perspective view of a battery device according to an embodiment of the present application, wherein the temperature balancing layer is omitted from the heat exchange assembly;

[0067] Figure 3 A cross-sectional view of a battery device provided in one embodiment of the present application;

[0068] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0069] Figure 5 A schematic diagram of the connection structure between the heat exchange assembly and the bottom guard plate provided in one embodiment of the present application, wherein the heat exchange assembly omits the temperature balancing layer;

[0070] Figure 6 The heat exchange assembly provided in one embodiment of the present application omits the structural diagram of the temperature balancing layer;

[0071] Figure 7 A schematic structural diagram of a bottom guard plate provided in one embodiment of the present application;

[0072] Figure 8 This is a perspective exploded schematic diagram of a battery device provided in one embodiment of the present application, wherein the first box portion is omitted;

[0073] Figure 9 A schematic diagram of a three-dimensional exploded view of a heat exchange assembly provided in one embodiment of the present application.

[0074] Description of Reference Numerals

[0075] 10. Battery cell assembly; 11. Battery cell; 20. Box assembly; 21. Box body; 211. First box body portion; 212. Second box body portion; 22. Bottom guard plate; 221. Connecting portion; 222. Limiting structure; 23. First accommodating cavity; 24. Second accommodating cavity; 30. Heat exchange assembly; 31. Flexible part; 32. Medium flow channel; 33. Avoidance hole; 34. Hot pressing area; 35. Inlet; 36. Outlet; 37. Temperature equalizing layer; 38. Temperature equalizing part; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0076] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0077] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0078] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These 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 vehicles, as well as in aerospace and other fields.

[0079] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0080] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0081] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released 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.

[0082] 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.

[0083] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0084] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0086] In some embodiments, a metal foam may be used as the positive electrode. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, the positive electrode active material may be filled and / or deposited within the metal foam.

[0087] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0088] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, or a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] 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.

[0090] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0091] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional 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.

[0092] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0093] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0094] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0095] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0096] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0097] As an example, the primary 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 separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0098] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0099] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0100] The liquid electrolyte includes an electrolyte salt and a solvent.

[0101] 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0102] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0103] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives capable of improving 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.

[0104] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0105] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0106] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0107] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0108] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0109] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0110] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0111] In some embodiments, the electrode assembly is a laminate structure.

[0112] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0113] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0114] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0115] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0116] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0117] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0118] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0119] In some embodiments, the battery cell may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0120] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0121] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0122] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0123] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0124] Power plants are increasingly demanding higher area energy density for energy storage containers. Consequently, to increase the amount of electricity they can hold, the weight of the containers is also increasing. However, containers must be transported from production sites to their intended destinations by land and / or sea, and these transport methods often have weight restrictions. This creates a conflict between the increased energy density and the weight of the energy storage containers.

[0125] During the use of the battery device, the battery cells in the battery device will generate heat. If this heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate heat from the battery cells of the battery device has become an important research direction in this field. In the related art, a cooling system is provided in the battery device box to cool the battery cells in the battery device. The above-mentioned cooling system may include multiple aluminum water-cooling plates laid in the battery device box, and the surfaces of the multiple water-cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the above-mentioned multiple water-cooling plates, thereby removing heat from the battery cells and cooling the battery cells. However, when the aluminum water-cooling plates in the above-mentioned cooling system do not fit well with the surfaces of the battery cells in the battery device, the heat exchange efficiency and heat exchange effect are poor. At the same time, when assembling with the battery cell assembly, assembly tolerance compensation and filling of caulking agent are required, and the production cost is high. Furthermore, the high rigidity of the cooling plate and battery housing requires the use of hard structural adhesive, making disassembly difficult. Using self-adhesive, soft, or double-sided adhesive can lead to debonding if gaps or mismatches in flatness exist between the rigidity of the cooling plate and battery housing. Furthermore, temperature variations in different areas of the cooling system and heat generation in different areas of the battery assembly contribute to poor temperature uniformity within the battery assembly.

[0126] In view of this, to improve the temperature uniformity of a battery device, an embodiment of the present application provides a battery device comprising a housing assembly, a battery cell assembly, and a heat exchange assembly. The housing assembly defines a first accommodating cavity. The battery cell assembly is disposed within the first accommodating cavity. The heat exchange assembly is configured to exchange heat with the battery cell assembly. The heat exchange assembly includes a heat exchange layer and a temperature-averaging layer, with the heat exchange layer uniformly exchanging heat with the battery cell assembly via the temperature-averaging layer.

[0127] The battery device provided in an embodiment of the present application includes a housing assembly, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed within a first accommodating cavity of the housing assembly, and the housing assembly protects the battery cell assembly. The heat exchange assembly is configured to include a heat exchange layer and a temperature-equalizing layer. The heat exchange layer uniformly exchanges heat with the battery cell assembly through the temperature-equalizing layer. In other words, the heat exchange medium within the medium flow channel of the heat exchange layer can first exchange heat with the temperature-equalizing layer. After the temperature-equalizing layer has equalized the heat, it can then exchange heat with the battery device. In this way, the temperature differences between different areas of the battery device can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device.

[0128] The technical solutions described in the embodiments of this application are applicable to electrical equipment using a battery device. The electrical equipment includes a battery device according to any embodiment of this application, and the battery device is used to provide electrical energy.

[0129] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0130] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including box assemblies and electrical equipment using battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0131] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0132] To meet varying power requirements, the battery device includes a battery cell assembly 10, which can include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery device module or battery device pack. Multiple battery cells 11 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within multiple battery cells 11. Multiple battery cells 11 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire assembly of multiple battery cells 11 is housed within a housing assembly 20. Alternatively, the battery device 100 can be constructed by first connecting multiple battery cells 11 in series, in parallel, or in a hybrid configuration to form a battery device module. Multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing assembly 20. The battery device 100 can also include other structures, such as a busbar assembly to electrically connect the 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 may be cylindrical, flat, rectangular, or in other shapes.

[0133] An embodiment of the present application provides a battery device comprising a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The housing assembly 20 defines a first accommodating cavity 23. The battery cell assembly 10 is disposed within the first accommodating cavity 23. The heat exchange assembly 30 is configured to exchange heat with the battery cell assembly 10. The heat exchange assembly 30 includes a heat exchange layer and a temperature-distributing layer 37, through which the heat exchange layer uniformly exchanges heat with the battery cell assembly 10.

[0134] Please refer to Figure 2 and Figure 8 The battery device includes a box assembly 20 and a battery cell assembly 10 . The battery cell assembly 10 includes at least one battery cell 11 . The battery cell 11 is disposed in a first accommodating cavity 23 of the box assembly 20 .

[0135] The housing assembly 20 can be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing assembly 20 can be made of 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.

[0136] The box assembly 20 is used to encapsulate the battery cell assembly 10 . The box assembly 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell assembly 10 .

[0137] The embodiment of the present application provides a heat exchange assembly 30 , which is the heat exchange assembly 30 of the battery device 100 provided in the embodiment of the present application. The heat exchange assembly 30 is used to exchange heat with the battery cell assembly 10 .

[0138] Here, the heat exchange component 30 can be arranged in the first accommodating cavity 23, that is, it can be in direct contact with the battery cell assembly 10 to improve the heat exchange efficiency, or it can be arranged outside the first accommodating cavity 23 and transfer heat through the intermediate medium, thereby realizing heat exchange between the heat exchange component 30 and the battery cell assembly 10.

[0139] Exemplarily, the heat exchange layer includes at least two flexible parts 31, which are stacked and at least one medium flow channel 32 is formed between the flexible parts 31. The at least one medium flow channel 32 is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell assembly 10.

[0140] Here, the flexible part 31 is set as a flexible structure, and the flexible part 31 has certain expandable or contractible characteristics. It can also be understood that the flexible part 31 can be an elastically deformable structure. The flexible part 31 has the ability to deform and restore 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 to improve the fit between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, thereby improving the heat exchange efficiency.

[0141] That the heat exchange assembly 30 includes at least two flexible members 31 means that the number of the flexible members 31 included in the heat exchange assembly 30 may be two or more than two.

[0142] Here, the flexibility of the flexible member 31 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its light weight, or a property imparted to the material due to at least one of its properties, such as thickness, stiffness, strength, and elastic modulus. As an example, the material of the flexible member 31 can be selected to be a material that is lighter than conventional structures such as aluminum plates or steel plates, and its flexibility can be controlled by the thickness, width, length, and material type of the flexible member 31. By configuring the heat exchange assembly 30 as the flexible member 31 in the embodiment of the present disclosure, the weight of the heat exchange assembly 30 can be reduced.

[0143] It should be noted that the flexible member 31 can have conductive properties, which is beneficial for equipotential setting; the flexible member 31 can also have electrical insulation properties, without the need for insulation treatment, which is beneficial for reducing the leakage risk and production cost of the battery device 100, thereby improving the reliability of the battery device 100.

[0144] Here, the heat exchange layer is made of a flexible part 31, which is relatively light in weight, which is beneficial to reducing the weight of the battery device 100, reducing the production cost of the heat exchange component 30, and improving the energy density of the battery device 100; in addition, by setting the flexible part 31 as a flexible structure, the flexible structure has a certain deformation ability, which can make the heat exchange component 30 better fit and adapt to the box component 20 and / or the battery cell component 10, thereby absorbing the assembly tolerance of the heat exchange component 30, improving the fit between the heat exchange component 30 and the box component 20 and / or the battery cell component 10, and increasing the effective heat exchange area between the heat exchange component 30 and the box 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.

[0145] At least one medium flow channel 32 is formed between at least two flexible members 31 , which means that the heat exchange assembly 30 forms a medium flow channel 32 between adjacent flexible members 31 . The heat exchange medium flows through the medium flow channel 32 to achieve heat exchange with the battery cell assembly 10 .

[0146] Here, the number of the medium flow channel 32 may be one or more.

[0147] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can cool the battery cells 11. For example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a cooling liquid.

[0148] Exemplarily, the heat exchange assembly 30 further includes an inlet 35 and an outlet 36 , both of which are in communication with the medium flow channel 32 .

[0149] Here, the inlet 35 and the outlet 36 of the heat exchange assembly 30 are used to connect to pipelines of the entire vehicle or electrical equipment.

[0150] The principle of heat exchange of the heat exchange component 30 for the battery cell assembly 10 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel through the inlet 35 of the heat exchange component 30. After the heat exchange medium exchanges heat with the battery cell assembly 10, the heat exchange medium flows out through the outlet 36 of the heat exchange component 30, completing the heat exchange of the battery cell assembly 10.

[0151] Here, the heat exchange assembly 30 exchanging heat with the battery cell assembly 10 may be to dissipate heat from the battery cell assembly 10 or to heat the battery cell assembly 10 .

[0152] The principle of heat dissipation of the battery cell assembly 10 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel through the inlet 35 of the heat exchange component 30. After the heat exchange medium absorbs the heat generated during the operation of the battery cell assembly 10, the heat exchange medium flows out through the outlet 36 of the heat exchange component 30, releasing the heat, and completing the cooling and heat dissipation of the battery cell assembly 10.

[0153] The principle of the heat exchange component 30 heating the battery cell assembly 10 is as follows: the heat exchange medium output by the heat exchange medium 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, completing the heating of the battery cell assembly 10.

[0154] The following description takes the heat exchange assembly 30 dissipating heat from the battery cell assembly 10 as an example. The heat exchange assembly 30 heats the battery cell assembly 10 in a similar manner and will not be described in detail here.

[0155] Exemplarily, the temperature-averaging layer 37 is arranged on the side of the heat exchange layer close to the battery cell assembly 10, that is, the temperature-averaging layer 37 is arranged between the heat exchange layer and the battery cell assembly 10. In this way, the heat exchange medium in the medium flow channel 32 formed between the heat exchange layers first exchanges heat with the temperature-averaging layer 37, and the temperature-averaging layer 37 balances the heat before exchanging heat with the battery device 100. In this way, the temperature difference between different areas of the battery device 100 can be adjusted to a certain extent.

[0156] Here, the temperature-uniform layer 37 may be in direct contact with the battery cell assembly 10 or may not be in direct contact with the battery cell assembly 10 .

[0157] It can be understood that the heat exchange medium in the medium flow channel 32 continuously exchanges heat with the battery cell assembly 10 during the flow process. That is, the heat exchange medium absorbs the heat of the battery cell assembly 10 to dissipate heat from the battery cell assembly 10, causing the temperature of the heat exchange medium to gradually increase. That is, along the flow direction of the heat exchange medium, the temperature of the heat exchange medium located upstream is lower than the temperature of the heat exchange medium located downstream, thereby causing the heat dissipation effect of the heat exchange medium located downstream on the battery cell assembly 10 to deteriorate, and further resulting in poor temperature uniformity of the battery device 100.

[0158] By setting a temperature-equalizing layer 37 between the heat exchange layer and the battery cell assembly 10, the heat exchange medium in the medium flow channel 32 can first exchange heat with the temperature-equalizing layer 37. That is, the temperature-equalizing layer 37 can at least balance the temperatures upstream and downstream of the medium flow channel 32, that is, the temperature of the temperature-equalizing layer 37 can be made more uniform, and by exchanging heat with the battery cell assembly 10, the problem of poor temperature uniformity of the battery device 100 can be improved.

[0159] The battery device provided in the embodiment of the present application includes a housing assembly 20, a battery cell assembly 10, and a heat exchange assembly 30. The battery cell assembly 10 is disposed in the first accommodating cavity 23 of the housing assembly 20, and the housing assembly 20 protects the battery cell assembly 10. The heat exchange assembly 30 is configured to include a heat exchange layer and a temperature-uniform layer 37. The heat exchange layer uniformly exchanges heat with the battery cell assembly 10 through the temperature-uniform layer 37. That is, the heat exchange medium in the medium flow channel 32 of the heat exchange layer first exchanges heat with the temperature-uniform layer 37. After the temperature-uniform layer 37 has balanced the heat, it exchanges heat with the battery device 100. In this way, the temperature difference between different areas of the battery device 100 can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device 100.

[0160] In some embodiments, a refrigerant is disposed inside the temperature-balancing layer 37 .

[0161] Here, a refrigerant refers to a substance that easily absorbs heat, transforming into a gas, and then easily releases heat, transforming into a liquid. In a refrigeration system, a refrigerant is used to transfer heat energy, producing a cooling effect. The refrigerant is an intermediate substance in the refrigeration process, first receiving cold energy and then cooling the other substances being cooled.

[0162] The specific type of refrigerant is not limited here, and it can be some common or commonly used refrigerants.

[0163] In this embodiment, by providing a refrigerant inside the temperature-averaging layer 37 , the heat exchange efficiency of the temperature-averaging layer 37 is improved, thereby improving the heat exchange efficiency and temperature-averaging effect of the heat exchange assembly 30 .

[0164] Here, the heat exchange assembly 30 can be disposed in the first accommodating cavity 23 , that is, the heat exchange assembly 30 can be in direct contact with the battery cell assembly 10 , thereby further improving the heat exchange efficiency between the heat exchange assembly 30 and the battery cell assembly 10 .

[0165] Of course, in other embodiments, a heat exchange assembly 30 may be provided on the outside of the first accommodating cavity 23 .

[0166] That is, at least a portion of the heat exchange assembly 30 is disposed outside the first accommodating cavity 23 , so as to separate the heat exchange assembly 30 from the battery cell assembly 10 .

[0167] In related art, heat exchange assemblies and battery cell assemblies are placed in the same space. Leakage of the heat exchange medium in the cooling system increases the risk of short-circuiting the battery cell assemblies within the battery device box, impacting the reliability of the battery device. In this embodiment, a heat exchange assembly 30 is provided outside the first accommodating cavity 23 to separate the heat exchange assembly 30 from the battery cell assemblies 10. This reduces the risk of heat exchange medium leaking from the heat exchange assembly 30 and contacting the battery cell assemblies 10, thereby reducing the risk of short-circuiting the battery device 100 and improving its reliability.

[0168] The box assembly 20 is used to accommodate the battery cell assembly 10. The box assembly 20 can be of various structures. In some embodiments, please refer to Figure 2 The housing assembly 20 includes a housing body 21. The housing body 21 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 together define a first accommodating cavity 23 for accommodating the battery cell assembly 10. The second housing portion 212 may be a hollow structure with one end open. 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 the housing body 21 having the first accommodating cavity 23. The first housing portion 211 and the second housing portion 212 may also each be a hollow structure with one end open. The open side of the first housing portion 211 covers the open side of the second housing portion 212 to form the housing body 21 having the first accommodating cavity 23. Of course, the first housing portion 211 and the second housing portion 212 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0169] In order to improve the sealing performance after the first box body 211 and the second box body 212 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 211 and the second box body 212 .

[0170] Assuming that the first box portion 211 covers the top of the second box portion 212 , the first box portion 211 can also be referred to as an upper box cover, and the second box portion 212 can also be referred to as a lower box cover.

[0171] In other embodiments, the box assembly 20 includes a box body 21 and a bottom guard plate 22. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the outer side wall of the box body 21. A heat exchange assembly 30 is disposed in the second accommodating cavity 24.

[0172] It should be noted that the bottom guard plate 22 can be arranged at the bottom of the box body 21. In this case, the bottom guard plate 22 is, for example, the bottom guard plate 22. The bottom guard plate 22 can also be arranged at the top of the box body 21 or at the side of the box body 21.

[0173] For example, see Figures 2 to 7 The box assembly 20 includes a box body 21 and a bottom guard plate 22. The box body 21 includes a first box body portion 211 and a second box body portion 212. A first accommodating cavity 23 is formed between the first box body portion 211 and the second box body portion 212. A second accommodating cavity 24 is formed between the bottom guard plate 22 and the second box body portion 212. A heat exchange assembly 30 is arranged in the second accommodating cavity 24.

[0174] Here, the heat exchange component 30 is arranged in the second accommodating chamber 24, which means that the heat exchange component 30 can be arranged only in the second accommodating chamber 24, or the heat exchange component 30 can be arranged in other areas except the second accommodating chamber 24 in addition to being arranged in the second accommodating chamber 24.

[0175] A second accommodating cavity 24 is formed between the bottom guard plate 22 and the second box portion 212 , that is, the first accommodating cavity 23 and the second accommodating cavity 24 are separated.

[0176] Here, by providing the bottom guard plate 22 , the heat exchange assembly 30 can be supported and protected.

[0177] The heat exchange assembly 30 is arranged in the second accommodating cavity 24, that is, the heat exchange assembly 30 is arranged outside the first accommodating cavity 23, so as to separate the heat exchange assembly 30 from the battery cell assembly 10, thereby avoiding the heat exchange medium of the heat exchange assembly 30 from leaking and contacting the battery cell assembly 10, thereby causing the battery device 100 to short-circuit, thereby improving the safety performance and reliability of the battery device 100.

[0178] In this embodiment, a bottom guard plate 22 is provided on the outside of the box body 21 to define a second accommodating chamber 24 between the bottom guard plate 22 and the second box portion 212. The heat exchange assembly 30 is disposed within the second accommodating chamber 24 for heat exchange with the box body 21, thereby achieving heat exchange with the battery cell assembly 10 carried within the box body 21. In other words, by disposing the heat exchange assembly 30 outside the first accommodating chamber 23 of the box assembly 20, the problem of short circuiting of 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, thereby improving the safety and reliability of the battery device 100, and maximizing the utilization of the accommodating chamber within the box assembly 20, thereby increasing the compactness of the battery device 100. Furthermore, by providing the bottom guard plate 22, the bottom guard plate 22 cooperates with the box body 21 to connect and protect the battery cell assembly 10, further improving the reliability of the box assembly 20.

[0179] In some embodiments, see Figures 2 to 7 Part of the bottom guard plate 22 protrudes to form a circle of connecting portion 221, and the connecting portion 221 is sealed and connected to the second box body portion 212.

[0180] Part of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 , and the connecting portions 221 are used to connect with the second box portion 212 .

[0181] Exemplarily, the edge of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 , that is, the outermost circle of the bottom guard plate 22 protrudes to form a circle of connecting portions 221 .

[0182] The specific method of connecting the connecting portion 221 and the second box body portion 212 is not limited herein. For example, the connecting portion 221 and the second box body portion 212 are fastened together by bolts, screws, or rivets.

[0183] In this embodiment, the protruding connecting portion 221 forms a circle, which not only connects to the second housing portion 212 but also defines a second accommodating chamber 24 between the bottom guard plate 22 and the second housing portion 212. Furthermore, the sealing connection between the connecting portion 221 and the second housing portion 212 can, to a certain extent, prevent mud, sand, or water from entering the second accommodating chamber 24, thereby protecting the heat exchange assembly 30 in the second accommodating chamber 24.

[0184] In some embodiments, the box assembly 20 further includes a seal, which is disposed between the connecting portion 221 and the second box portion 212 .

[0185] Exemplarily, the sealing member is, for example, a sealing strip.

[0186] In this embodiment, a seal is provided and the seal is clamped between the connecting portion 221 and the second box portion 212. That is, the seal is used to seal the gap between the connecting portion 221 and the second box portion 212, which further helps to prevent mud, sand or water from entering the second accommodating cavity 24, thereby improving the sealing performance between the bottom guard plate 22 and the second box portion 212.

[0187] In some embodiments, see Figures 2 to 7 Part of the bottom guard plate 22 is protruding to form a limiting structure 222. The limiting structure 222 is used to support the flexible member 31 and / or the second box portion 212.

[0188] Here, the limiting structure 222 is used to support the flexible member 31 and / or the second box body 212, which means that the limiting structure 222 abuts against the flexible member 31 and / or the second box body 212, providing a certain supporting force for the flexible member 31 and / or the second box body 212. In other words, the limiting structure 222 can be used to support the flexible member 31, the second box body 212, or both the flexible member 31 and the second box body 212.

[0189] It should be noted that part of the area of the bottom guard plate 22 is protruding to form a limiting structure 222, which may mean that the side of the bottom guard plate 22 facing away from the box body 21 is concave, so that the side of the bottom guard plate 22 facing the box body 21 is protruding to form the limiting structure 222; it may also be that the side of the bottom guard plate 22 facing away from the box body 21 is not concave, and the side of the bottom guard plate 22 facing the box body 21 is thickened and protruded to form the limiting structure 222.

[0190] The limiting structure 222 is used to support the flexible member 31 and / or the second box portion 212 so as to form a fixed space between the bottom guard plate 22 and the second box portion 212 , which is beneficial to improving the reliability of the battery device 100 .

[0191] In this embodiment, the bottom guard plate 22 is used to support the flexible part 31 and / or the second box body 212 by setting a limiting structure 222. This is beneficial to improving the problem of deformation of the second box body 212 due to insufficient support strength when it is under pressure, thereby improving the problem of the second box body 212 directly adhering to the heat exchange component 30, which causes the heat exchange component 30 to be crushed. It is beneficial 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.

[0192] In some embodiments, the limiting structure 222 causes the flexible member 31 to abut against the second box portion 212 to support the flexible member 31 and the second box portion 212 .

[0193] For example, in an embodiment where the limiting structure 222 is used to support the flexible member 31 , the limiting structure 222 may be supported on the surface of the flexible member 31 and cause the flexible member 31 to abut against the second box portion 212 .

[0194] In this embodiment, the limiting structure 222 is provided to abut the flexible member 31 against the second box body portion 212 , which not only supports the second box body portion 212 but also fixes the heat exchange assembly 30 , thereby improving the stability of the heat exchange assembly 30 .

[0195] In some embodiments, the heat exchange assembly 30 is provided with an avoidance hole 33 , and the limiting structure 222 passes through the avoidance hole 33 to abut against the second box portion 212 .

[0196] Here, the heat exchange component 30 is provided with an avoidance hole 33 , that is, the flexible member 31 is provided with an avoidance hole 33 , and the avoidance hole 33 passes through two opposite sides of the heat exchange component 30 in the thickness direction.

[0197] It should be noted that the avoidance hole 33 needs to avoid the medium flow channel 32 .

[0198] Here, the specific position and number of the avoidance holes 33 are not limited and are determined according to specific circumstances.

[0199] For example, in an embodiment where the limiting structure 222 is used to support the second box body portion 212 , the heat exchange assembly 30 may be provided with an avoidance hole 33 for avoiding the limiting structure 222 so that the limiting structure 222 passes through the avoidance hole 33 to abut against the second box body portion 212 .

[0200] In this embodiment, the heat exchange component 30 avoids the limiting structure 222 by setting an avoidance hole 33. The limiting structure 222 passes through the avoidance hole 33 to abut against the second box body 212. While supporting the second box body 212, it can also position the heat exchange component 30, thereby improving the stability of the heat exchange component 30.

[0201] In some embodiments, at least two flexible members 31 include a hot pressing region 34 . The hot pressing region 34 is configured such that at least two flexible members 31 are formed by hot pressing. The hot pressing region 34 separates the heat exchange assembly 30 to form at least one medium flow channel 32 .

[0202] Here, the flexible member 31 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 30 has good sealing performance and is not prone to cracking.

[0203] In this embodiment, the flexible member 31 is sealed by a hot pressing process, that is, a hot pressing area 34 is formed by hot pressing. The hot pressing area 34 separates the heat exchange component 30 to form at least one medium flow channel 32. This molding method is simple.

[0204] In some embodiments, the flexible member 31 is configured as a metal plasticized film.

[0205] The flexible member 31 is a single-layer or multi-layer film.

[0206] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0207] In this embodiment, the thin and lightweight metal-plasticized films, combined with the medium flow channel 32 formed between at least two metal-plasticized films, are unaffected by the extrusion process and do not require a high thickness. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the insulation properties of the heat exchange assembly 30 reduce the risk of insulation failure. This reduces the risk of reaction between the heat exchange assembly 30 and the heat exchange medium flowing within it, further minimizing the risk of corrosion and leakage of the heat exchange medium.

[0208] Exemplarily, at least two flexible members 31 are configured as aluminum-plastic films.

[0209] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0210] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0211] Here, the flexible member 31 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0212] For example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0213] Here, the number of metal layers and non-metal layers is not limited.

[0214] In this embodiment, the flexible member 31, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel 32 between at least two flexible members 31, it is unaffected by the extrusion process and eliminates the need for a high thickness requirement. This reduces the overall thickness and weight of the heat exchange assembly 30. Furthermore, the heat exchange assembly 30 does not react with the heat exchange medium flowing within it, eliminating the risk of corrosion or leakage.

[0215] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil.

[0216] By setting the metal layer to be one of aluminum foil, copper foil and steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0217] In some embodiments, the non-metallic layer includes one of polypropylene, polyvinyl chloride, and polyethylene.

[0218] By setting the non-metallic layer to be one of polypropylene, polyvinyl chloride and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0219] For example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, additives may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0220] In some embodiments, the non-metallic layer is a hot melt layer.

[0221] Here, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0222] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel 32 than the corrosion-resistant layer.

[0223] Here, the corrosion-resistant layer may be a nylon layer formed of nylon material, thereby having certain corrosion resistance, such as acid and alkali corrosion resistance.

[0224] The isolation layer may be a metal layer, and the metal layer may be configured as one of aluminum foil, copper foil and steel foil, which can provide the flexible member 31 with a certain structural strength and play an isolation role.

[0225] The waterproof layer may be a non-metallic layer, and the non-metallic layer may be configured to be one of polypropylene, polyvinyl chloride and polyethylene, so that the flexible member 31 may have a certain waterproof effect.

[0226] In this embodiment, by configuring the flexible member 31 to include a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence, 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 assembly 30.

[0227] In some embodiments, the isolation layer has a thickness of 6.5 μm to 100 μm.

[0228] The thickness of the isolation layer can be any one of 6.5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 38μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm or any value between two of them.

[0229] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-100 μm, the flexible member 31 can have a certain structural strength and flexibility.

[0230] In some embodiments, the isolation layer has a thickness of 6.5 μm to 15 μm.

[0231] The thickness of the isolation layer can be any one of 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, 15μm or any value between any two of them.

[0232] In this embodiment, by setting the thickness of the isolation layer to 6.5 μm-15 μm, the flexible member 31 can be further endowed with certain structural strength and flexibility.

[0233] In some embodiments, the corrosion-resistant layer has a thickness of 5 μm to 20 μm.

[0234] 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. Any one of the point values of 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, 20μm or any point value between any two of them.

[0235] In this embodiment, by setting the thickness of the corrosion-resistant layer to 5 μm-20 μm, the wear resistance and toughness of the flexible member 31 can be improved.

[0236] In some embodiments, the waterproof layer has a thickness of 50 μm to 120 μm.

[0237] The thickness of the waterproof layer can be any one of 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 92μm, 95μm, 100μm, 105μm, 108μm, 110μm, 115μm, 120μm or any value between two of them.

[0238] In this embodiment, by setting the thickness of the waterproof layer to 50 μm-120 μm, the waterproof layer can have a certain structural strength, improve the waterproof performance, and facilitate hot pressing connection of the flexible member 31 through the waterproof layer.

[0239] In some embodiments, the thickness of the flexible member 31 is 0.05 mm to 0.3 mm.

[0240] 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.

[0241] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength while the overall thickness of the heat exchange component 30 is smaller, which is beneficial to reducing the overall volume and weight of the battery device 100 and increasing the energy density of the battery device 100.

[0242] In some embodiments, the thickness of the flexible member 31 is 0.08 mm to 0.2 mm.

[0243] 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.

[0244] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange component 30 is further made smaller, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0245] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0246] Exemplarily, the elastic modulus of the flexible part 31 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0247] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to a certain force range. It is one of the fundamental physical quantities of a material. The larger the elastic modulus, the greater the material's stiffness and compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0248] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange component 30, and has a certain deformation ability, which can improve the fit between the heat exchange component 30 and the box 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 box 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.

[0249] It should be noted that there are many specific configuration methods for the temperature-uniform layer 37 .

[0250] In some embodiments, see Figure 8 and Figure 9 The temperature-uniform layer 37 includes a plurality of temperature-uniform elements 38 , and the thermal resistance of at least one temperature-uniform element 38 is different from the thermal resistance of the other temperature-uniform elements 38 .

[0251] The fact that the thermal resistance of at least one temperature equalizing element 38 is different from that of other temperature equalizing elements 38 means that not all temperature equalizing elements 38 have the same thermal resistance. In other words, the thermal resistance of the temperature equalizing elements 38 corresponding to different areas of the battery device 100 can be adjusted accordingly according to the heat dissipation or heating requirements of different areas of the battery device 100.

[0252] It's important to note that thermal resistance and thermal conductivity are two indicators used to measure the thermal performance of building or assembly materials. Thermal resistance represents a material's ability to prevent heat from passing through it. The higher the R-value, the greater the material's heat resistance and insulation performance.

[0253] θ=L / (λS);

[0254] Where: θ is thermal resistance; λ is thermal conductivity; L is material thickness or length; S is heat transfer area.

[0255] An object's ability to block heat flow is proportional to the length of the conduction path, inversely proportional to the cross-sectional area through which it passes, and inversely proportional to the thermal conductivity of the material. In other words, the thermal resistance of the temperature-balancing layer 37 can be adjusted by controlling the material and thickness of the material.

[0256] In this embodiment, by setting the temperature-equalizing layer 37 to include multiple temperature-equalizing parts 38, and the thermal resistance of at least one temperature-equalizing part 38 is different from the thermal resistance of other temperature-equalizing parts 38, temperature-equalizing layers 37 with different thermal resistances can be used in different areas of the battery cell assembly 10 as needed, that is, the heat exchange assembly 30 can be thermally managed in different zones, further improving the thermal management performance and temperature uniformity of the battery device 100.

[0257] In some embodiments, the battery cell assembly 10 includes a first temperature zone and a second temperature zone, wherein the temperature of the first temperature zone is higher than that of the second temperature zone. The thermal resistance of the temperature equalizer 38 corresponding to the first temperature zone is lower than that of the temperature equalizer 38 corresponding to the second temperature zone.

[0258] It is understandable that during use of the battery device 100, the temperatures corresponding to different areas are different. For example, the temperature near the center of the battery cell assembly 10 is higher and is not easy to dissipate heat to the surrounding areas, and is generally higher than the temperature at the edge of the battery device 100.

[0259] The first temperature zone is, for example, a high temperature zone, and the second temperature zone is, for example, a low temperature zone. The temperature of the first temperature zone is higher than that of the second temperature zone.

[0260] It should be noted that the first temperature zone and the second temperature zone in the embodiment of the present application are absolute numerical ranges, and the present application does not specifically limit the numerical ranges. The size of the numerical ranges can be set according to the specific type of the battery device 100, for example, can be set through simulation analysis.

[0261] In this embodiment, the battery device 100 is divided into different temperature zones, and the thermal resistance of the temperature equalizer 38 corresponding to the different temperature zones is different. Specifically, the thermal resistance of the temperature equalizer 38 corresponding to the high-temperature zone is set to be lower than the thermal resistance of the temperature equalizer 38 corresponding to the low-temperature zone, so as to realize zoned thermal management of the battery device 100. This is more conducive to heat exchange in the high-temperature zone, that is, the temperature equalizer 38 with low thermal resistance is more conducive to heat dissipation in the high-temperature zone of the battery device 100, thereby making the temperature of the battery device 100 more uniform, and further improving the thermal management performance and temperature uniformity of the battery device 100.

[0262] In some embodiments, the heat exchange layer has a medium flow channel 32 for conducting heat exchange medium. The thermal resistance of the temperature equalizer 38 corresponding to the upstream area of the medium flow channel 32 is higher than the thermal resistance of the temperature equalizer 38 corresponding to the downstream area of the medium flow channel 32.

[0263] It can be understood that since the temperature of the heat exchange medium located upstream of the medium flow channel 32 is lower than the temperature of the heat exchange medium located downstream, the heat exchange medium located downstream has a poor heat dissipation effect on the battery cell assembly 10, which in turn leads to poor temperature uniformity of the battery device 100.

[0264] In this embodiment, the thermal resistance of the temperature equalizing component 38 corresponding to the upstream area of the medium flow channel 32 is higher than the thermal resistance of the temperature equalizing component 38 corresponding to the downstream area of the medium flow channel 32, so as to achieve zoned thermal management of the battery device 100. This is more conducive to heat exchange in the downstream area of the medium flow channel 32, that is, the heat exchange efficiency between the low thermal resistance temperature equalizing component 38 corresponding to the downstream area of the medium flow channel 32 and the heat exchange medium is higher, thereby making the temperature of the battery device 100 more uniform, further improving the thermal management performance and temperature uniformity of the battery device 100.

[0265] In some embodiments, the heat exchange layer has a medium flow channel 32 for conducting a heat exchange medium. The battery cell assembly 10 includes a first temperature zone and a second temperature zone, where the temperature of the first temperature zone is higher than that of the second temperature zone. At least a portion of the medium flow channel 32 corresponding to the first temperature zone is wider than at least a portion of the medium flow channel 32 corresponding to the second temperature zone.

[0266] That is, the widths of the medium flow channels 32 are not all the same.

[0267] It should be noted that the greater the width of the medium flow channel 32, the greater the flow cross-sectional area of the medium flow channel 32, and thus the corresponding greater flow rate of the heat exchange medium in the medium flow channel 32. In other words, the flow cross-sectional area of the medium flow channel 32 is controlled according to the width of the medium flow channel 32.

[0268] In this embodiment, the width of the medium flow channel 32 can be designed to be different according to the heat dissipation requirements of different areas of the battery device 100. For example, the width of the medium flow channel 32 corresponding to the high-temperature area of the battery device 100 is generally larger, and the width of the medium flow channel 32 corresponding to the low-temperature area of the battery device 100 is smaller. According to the temperature changes in different areas of the battery device 100, the flow of the heat exchange medium is distributed, the overall temperature of the battery device 100 is accurately adjusted, the heat exchange efficiency and heat exchange effect of the heat exchange component 30 are improved, and the thermal management performance and temperature uniformity of the battery device 100 are improved.

[0269] In some embodiments, the heat exchange component 30 further includes an adhesive layer, and the heat exchange layer is bonded to the temperature uniforming layer 37 via the adhesive layer.

[0270] Here, the adhesive layer is formed by, for example, double-sided tape or self-adhesive tape bonded between the temperature-uniform layer 37 and the heat exchange layer.

[0271] In this embodiment, the heat exchange layer is bonded to the temperature-averaging layer 37 via the adhesive layer, which is beneficial to improving the fit between the heat exchange layer and the temperature-averaging layer 37, thereby improving the heat exchange efficiency and heat exchange effect.

[0272] In some embodiments, the thermal conductivity of the temperature-uniform layer 37 is 0.1 W / (m·K)-200 W / (m·K).

[0273] For example, 0.1W / (m·K), 1W / (m·K), 5W / (m·K), 10W / (m·K), 15W / (m·K), 20W / (m·K), 50W / (m·K), 80W / (m·K), 95W / (m·K), 100W / (m·K), 115W / (m·K), 120W / (m·K), 130W / (m·K), 140W / (m·K), 150W / (m·K), 160W / (m·K), 170W / (m·K), 180W / (m·K), 190W / (m·K), 200W / (m·K), and so on.

[0274] By setting the thermal conductivity of the temperature-balancing layer 37 to 0.1 W / (m·K)-200 W / (m·K), the temperature-balancing layer 37 can balance the heat before exchanging heat with the battery device 100. In this way, the temperature difference between different areas of the battery device 100 can be adjusted to a certain extent, thereby improving the thermal management performance and temperature uniformity of the battery device 100.

[0275] It should be noted that the thickness of the flexible member 31 and the elastic modulus of the flexible member 31 can be measured by a micrometer, a dynamometer or a vernier caliper.

[0276] In the description of this application, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations 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 a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in this application and features of different embodiments or examples, unless they are mutually inconsistent.

[0277] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application are intended to be within the scope of protection of the present application.

Claims

1. A battery device, characterized in that: include: The box assembly has a first accommodating cavity therein; A battery cell assembly is disposed in the first accommodating cavity; a heat exchange assembly, the heat exchange assembly being used to exchange heat with the battery monomer assembly; The heat exchange assembly includes a heat exchange layer and a temperature-uniform layer, and the heat exchange layer uniformly exchanges heat with the battery cell assembly through the temperature-uniform layer.

2. The battery device according to claim 1, wherein: The temperature-uniform layer includes a plurality of temperature-uniform components, and the thermal resistance of at least one of the temperature-uniform components is different from the thermal resistance of the other temperature-uniform components.

3. The battery device according to claim 2, characterized in that The battery cell assembly includes a first temperature zone and a second temperature zone. The temperature of the first temperature zone is higher than that of the second temperature zone. The thermal resistance of the temperature equalizing member corresponding to the first temperature zone is lower than that of the temperature equalizing member corresponding to the second temperature zone.

4. The battery device according to claim 2, wherein: The heat exchange layer has a medium flow channel, which is used to conduct heat exchange medium; the thermal resistance of the temperature equalizing component corresponding to the upstream area of the medium flow channel is higher than the thermal resistance of the temperature equalizing component corresponding to the downstream area of the medium flow channel.

5. The battery device according to claim 1, wherein: The heat exchange component further includes an adhesive layer, and the heat exchange layer is bonded to the temperature uniformity layer via the adhesive layer.

6. The battery device according to claim 1, wherein: The heat exchange layer has a medium flow channel, which is used to conduct heat exchange medium; the battery cell assembly includes a first temperature zone and a second temperature zone, the temperature of the first temperature zone is higher than the temperature of the second temperature zone, and the width of at least part of the medium flow channel corresponding to the first temperature zone is wider than the width of at least part of the medium flow channel corresponding to the second temperature zone.

7. The battery device according to claim 1, wherein: The thermal conductivity of the temperature-uniform layer is 0.1 W / (m·K)-200 W / (m·K).

8. The battery device according to claim 1, wherein: A refrigerant is arranged inside the temperature-averaging layer.

9. The battery device according to claim 1, wherein: The temperature-averaging layer is arranged on a side of the heat exchange layer close to the battery cell assembly.

10. The battery device according to any one of claims 1 to 9, characterized in that: The heat exchange layer includes at least two flexible parts, which are stacked and at least one medium flow channel is formed between the flexible parts. The at least one medium flow channel is used to conduct heat exchange medium.

11. The battery device according to claim 10, characterized in that The at least two flexible members are configured as metal plasticized films.

12. The battery device according to claim 10, wherein: The at least two flexible members are configured as aluminum-plastic films.

13. The battery device according to claim 10, wherein: The flexible member is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked in sequence.

14. The battery device according to claim 13, wherein: The metal layer includes one of aluminum foil, copper foil and steel foil.

15. The battery device according to claim 13, wherein: The non-metallic layer includes one of polypropylene, polyvinyl chloride and polyethylene.

16. The battery device according to claim 13, characterized in that The non-metallic layer is a hot-melt layer.

17. The battery device according to claim 10, wherein: The flexible member is a layered structure, and includes a corrosion-resistant layer, an isolation layer, and a waterproof layer arranged in sequence. The waterproof layer is closer to the medium flow channel than the corrosion-resistant layer.

18. The battery device according to claim 17, characterized in that The thickness of the isolation layer is 6.5 μm-100 μm.

19. The battery device according to claim 18, wherein: The thickness of the isolation layer is 6.5 μm-15 μm.

20. The battery device according to claim 17, wherein: The thickness of the corrosion-resistant layer is 5 μm-20 μm.

21. The battery device according to claim 17, wherein: The thickness of the waterproof layer is 50 μm-120 μm.

22. The battery device according to claim 10, wherein: The thickness of the flexible member is 0.05mm-0.3mm.

23. The battery device according to claim 22, characterized in that The thickness of the flexible member is 0.08 mm to 0.2 mm.

24. The battery device according to claim 10, wherein: The elastic modulus of the flexible member is 1500 MPa-10000 MPa.

25. The battery device according to claim 10, wherein: The at least two flexible parts include a hot pressing area, and the hot pressing area is configured such that the at least two flexible parts are formed by hot pressing. The hot pressing area separates the heat exchange component to form the at least one medium flow channel.

26. A heat exchange component, characterized in that: The heat exchange component is the heat exchange component of the battery device according to any one of claims 1 to 25, and the heat exchange component is used to exchange heat with the battery cell assembly.

27. An electrical device, characterized in that: The method comprises the battery device according to any one of claims 1 to 25 or the heat exchange component according to claim 26.

28. An energy storage device, characterized in that: The method comprises the battery device according to any one of claims 1 to 25 or the heat exchange component according to claim 26.

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