Battery device, heat exchange assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, a heat exchange assembly and electric equipment.The battery device comprises a box body, at least two battery monomers and the heat exchange assembly, the at least two battery monomers are located in the box body, the heat exchange assembly is arranged at the top of the box body, and the heat exchange assembly comprises at least two heat exchange pieces; at least one heat exchange part is arranged as a flexible part, at least one heat exchange part is arranged as a rigid part, the flexible part and the rigid part are stacked to form a medium flow channel, the medium flow channel is used for conducting a heat exchange medium, and the heat exchange medium is used for exchanging heat with at least two single batteries. At least part of the surface of at least one of the flexible part and the rigid part is provided with an anti-corrosion layer. The anti-corrosion layer provides an anti-corrosion function, the anti-corrosion performance of the heat exchange assembly is improved, the tolerance of the heat exchange assembly to corrosive substances such as heat exchange media and substances in the environment is improved, and therefore the reliability of the heat exchange assembly is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device, a heat exchange component and an electrical equipment. Background Art

[0002] The battery device can be used to store or provide electrical energy. The battery device can be used in electrical equipment. For example, the battery device can be used in vehicles and the like.

[0003] In the related art, taking a vehicle as an example, in a vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. During the use of the battery device, the temperature of the battery cells in the battery device will rise, and it is necessary to control the temperature of the battery cells. Otherwise, it is easy to have an adverse impact on the performance and service life of the battery device. Therefore, how to reduce the risk of corrosion of the heat exchange component while adjusting the temperature of the battery cells through the heat exchange component has become an important research direction in this field. Summary of the Utility Model

[0004] In view of this, embodiments of the present application are expected to provide a battery device, a heat exchange component and an electrical equipment, and the anti-corrosion layer provides an anti-corrosion function to improve the anti-corrosion performance of the heat exchange component.

[0005] To achieve the above object, the technical solution of the embodiments of the present application is realized as follows:

[0006] The embodiments of the present application provide a battery device, including:

[0007] A box body;

[0008] At least two battery cells, located inside the box body;

[0009] A heat exchange component, arranged on the top of the box body. The heat exchange component includes at least two heat exchange elements, at least one of the heat exchange elements is arranged as a flexible element, and at least one of the heat exchange elements is arranged as a rigid element. The flexible element and the rigid element are stacked to form a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells;

[0010] Wherein, at least part of the surface of at least one of the flexible element and the rigid element has an anti-corrosion layer.

[0011] In the battery device provided by the embodiment of the present application, the heat exchange component is used to exchange heat with the battery cell. By setting the heat exchange component to include a flexible member and a rigid member, the flexible member has a relatively light mass, which is beneficial to reducing the mass of the heat exchange component, lowering the production cost of the heat exchange component, and also beneficial to reducing the mass of the battery device. The flexible member and the rigid member are stacked to form at least one medium flow channel. The rigid member can support the flexible member, which is beneficial to improving the overall structural strength and stability of the heat exchange component and enhancing the applicability of the heat exchange component. The temperature on the top side of the battery cell is relatively higher. The heat exchange component is arranged on the top of the box body, and the heat exchange component is closer to the part with a relatively higher temperature of the battery cell, so as to cool the high-temperature side of the battery cell faster, reduce the temperature of the high-temperature area of the battery cell, and improve the heat exchange efficiency, and to a certain extent solve the problem of large temperature difference between the top and bottom of the battery cell. At least part of the surface of at least one of the flexible member and the rigid member has an anti-corrosion layer. The anti-corrosion layer provides an anti-corrosion function, enhances the anti-corrosion performance of the heat exchange component, improves the tolerance of the heat exchange component to corrosive substances such as heat exchange media and substances in the environment, and thus improves the reliability of the heat exchange component.

[0012] In some embodiments, the box body includes an annular frame and a bottom guard plate. The annular frame has a top-side opening and a bottom-side opening. The rigid member closes the top-side opening of the annular frame, and the bottom guard plate closes the bottom-side opening of the annular frame.

[0013] In this embodiment, the rigid member replaces the original top cover of the box body, reducing the components of the battery device. The rigid member forms a part of the box body, which can reduce the overall weight of the battery device.

[0014] In some embodiments, the top surface of the rigid member is covered with the anti-corrosion layer.

[0015] In this embodiment, the top surface of the rigid member is covered with the anti-corrosion layer. The anti-corrosion layer can isolate the environment and at least part of the top surface of the rigid member, reducing the risk of the top surface of the rigid member being corroded.

[0016] In some embodiments, at least part of the surface of the rigid member that forms the medium flow channel is covered with the anti-corrosion layer.

[0017] In this embodiment, at least part of the surface of the rigid member that forms the medium flow channel is covered with the anti-corrosion layer, improving the situation where the heat exchange medium damages the rigid member, which is beneficial to improving the reliability of the heat exchange component.

[0018] In some embodiments, all the surfaces of the rigid member facing the flexible member are covered with the anti-corrosion layer.

[0019] In this embodiment, all the surfaces of the rigid member facing the flexible member are covered with the anti-corrosion layer, which can reduce the manufacturing difficulty of the anti-corrosion layer.

[0020] In some embodiments, the anti-corrosion layer is hot-pressed onto the surface of the rigid member.

[0021] In this embodiment, the anti-corrosion layer is hot-pressed onto the surface of the rigid member. That is to say, the anti-corrosion layer and the rigid member are connected by a hot-pressing process. This forming method is simple and does not require spraying or electrophoresis processes, and the forming effect is better.

[0022] In some embodiments, the anti-corrosion layer is made of one of polypropylene, polyethylene, and polyamide.

[0023] In this embodiment, the anti-corrosion layer is made of one of polypropylene, polyethylene, and polyamide. The anti-corrosion layer can provide good waterproofing and / or corrosion resistance to heat exchange media.

[0024] In some embodiments, the flexible member has a layered structure. The flexible member includes a metal layer and two anti-corrosion layers, and the metal layer is laminated between the two anti-corrosion layers.

[0025] In this embodiment, the flexible member can provide plasticity through the metal layer, enabling the flexible member to maintain its basic shape. The metal layer is laminated between the two anti-corrosion layers, and the two anti-corrosion layers can encapsulate the metal layer to prevent the metal layer from contacting the heat exchange medium and corrosive substances in the environment, improving the corrosion resistance of the flexible member.

[0026] In some embodiments, the flexible member includes a metalized plastic film.

[0027] In this embodiment, due to the thin thickness and small weight of the metalized plastic film, and by forming a medium flow channel between the metalized plastic film and the rigid member, it is not affected by the extrusion process and does not need to meet large thickness requirements. Therefore, the overall thickness and weight of the heat exchange component can be reduced. At the same time, because the metalized plastic film has the characteristics of insulation and corrosion resistance to heat exchange media, it can reduce the possibility of insulation failure and also reduce the risk of reaction between the heat exchange component and the heat exchange media flowing inside, further reducing the possibility of corrosion and leakage of the heat exchange media.

[0028] In some embodiments, the flexible member includes an aluminum-plastic film.

[0029] In this embodiment, the flexible member uses an aluminum-plastic film. The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, meeting the insulation and anti-corrosion requirements.

[0030] In some embodiments, the flexible member has a layered structure. The flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are laminated in sequence.

[0031] In this embodiment, the flexible member formed by laminating a metal layer and a non-metal layer in sequence has a small thickness and a small weight. By forming a dielectric flow channel between the flexible member and the rigid member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange assembly can be reduced. In addition, the heat exchange assembly will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0032] In some embodiments, the metal layer includes one of aluminum foil, copper foil, and steel foil; and / or,

[0033] the non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0034] In this embodiment, by setting the metal layer as one of aluminum foil, copper foil, and steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer as one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member can have a certain waterproof function and / or corrosion resistance to the heat exchange medium.

[0035] In some embodiments, the non-metal layer is a hot melt layer.

[0036] In this embodiment, by setting the non-metal layer as a hot melt layer, that is, composed of a hot melt material, it is beneficial to composite the non-metal layer with the metal layer through hot melting, with simple molding and high production efficiency.

[0037] In some embodiments, the thickness of the flexible member is 0.05 mm - 1 mm.

[0038] In this embodiment, by setting the thickness of the flexible member to 0.05 mm - 1 mm, while the heat exchange assembly made of the flexible member has a certain structural strength, the overall thickness of the heat exchange assembly is small, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0039] In some embodiments, the thickness of the flexible member is 0.08 mm - 0.2 mm.

[0040] In this embodiment, by setting the thickness of the flexible member to 0.08 mm - 0.2 mm, while the heat exchange assembly made of the flexible member has a certain structural strength, the overall thickness of the heat exchange assembly is further reduced, which is beneficial to further reducing the overall volume and weight of the battery device to further increase the energy density of the battery device.

[0041] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa - 10000 MPa.

[0042] 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 also has a certain deformation ability, which can enhance the fitting degree between the heat exchange assembly and the box body and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange assembly and the box body and / or the battery cell, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0043] In some embodiments, the rigid member is set as a metal plate.

[0044] In this embodiment, by setting the rigid member as a metal plate, the metal plate has both good structural strength and good heat conduction performance. That is to say, while meeting a certain heat exchange efficiency of the heat exchange assembly, the rigid member can also play a certain supporting role for the flexible member.

[0045] An embodiment of the present application further provides a heat exchange assembly. The heat exchange assembly includes at least two heat exchange members. At least one of the heat exchange members is set as a flexible member, and at least one of the heat exchange members is set as a rigid member. The flexible member and the rigid member are stacked to form a medium flow channel. The medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells;

[0046] Wherein, at least part of the surface of at least one of the flexible member and the rigid member has an anti-corrosion layer.

[0047] The heat exchange assembly provided by the embodiment of the present application is used to exchange heat with a battery cell. By setting the heat exchange assembly to include a flexible member and a rigid member, the flexible member has a light weight, which is beneficial to reducing the weight of the heat exchange assembly, reducing the production cost of the heat exchange assembly, and is also beneficial to reducing the weight of the battery device. The flexible member and the rigid member are stacked to form at least one medium flow channel, and the rigid member can play a supporting role for the flexible member, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly and improving the applicability of the heat exchange assembly. At least part of the surface of at least one of the flexible member and the rigid member has an anti-corrosion layer, and the anti-corrosion layer provides an anti-corrosion function, enhancing the anti-corrosion performance of the heat exchange assembly, improving the tolerance of the heat exchange assembly to corrosive substances such as heat exchange media and substances in the environment, and thus improving the reliability of the heat exchange assembly.

[0048] An embodiment of the present application further provides an electrical equipment, including the battery device described in any one of the above or the heat exchange assembly described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic structural diagram of a vehicle in some embodiments of the present application;

[0050] Figure 2Explosion schematic diagram of the battery device in some embodiments of the present application, wherein the rigid member is configured as a top cover;

[0051] Figure 3 For Figure 2 Explosion schematic diagram of the heat exchange component of the battery device in

[0052] Figure 4 For Figure 3 Exploded view of the heat exchange component in

[0053] Figure 5 Explosion schematic diagram of the battery device in some other embodiments of the present application, wherein the rigid member is disposed on the bottom side of the top cover;

[0054] Figure 6 For Figure 5 Explosion schematic diagram of the heat exchange component of the battery device in

[0055] Figure 7 Explosion schematic diagram of the flexible member in some embodiments of the present application.

[0056] Description of reference numerals

[0057] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 21, flexible member; 211, metal layer; 22, rigid member; 201, anti-corrosion layer; 23, connecting member; 3, box body; 31, top cover; 32, annular frame; 33, bottom guard plate; 34, box body. Detailed implementation manners

[0058] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0060] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0061] It should be noted that in this application, at least two means two or more in number. A plurality means two or more in number.

[0062] Please refer to Figure 1 and Figure 2 , for the convenience of understanding the battery device 100 and the electrical device provided in the embodiments of the present application, some basic structures of the battery cell 1, the battery device 100 and the electrical device provided in the embodiments of the present application will be introduced first.

[0063] In the embodiments of the present application, the battery cell 1 can be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging and can continue to be used.

[0064] The battery cell 1 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0065] The battery cell 1 generally includes an electrode assembly, and the electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0066] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0067] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0068] As an example, the positive electrode current collector can be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metal, alloy, or metal with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. The composite current collector can include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0069] 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 conventional materials that can be used as the positive electrode active material of the battery can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated 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 manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0070] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0071] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as 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.).

[0072] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0073] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either or both of the two opposite surfaces of the negative electrode current collector.

[0074] As an example, the negative electrode active material can be the negative electrode active material known in the art for battery cell 1. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of battery cell 1 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0075] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0076] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0077] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator membrane.

[0078] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0079] In some embodiments, the battery cell 1 further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0080] Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0081] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalate) borate, lithium difluoro bis(oxalate) phosphate, and lithium tetrafluorooxalate phosphate.

[0082] 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, methyl propyl carbonate, ethyl propyl 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, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent 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.

[0083] In some embodiments, the electrolyte may optionally further include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives that can improve certain properties of the battery cell 1, such as additives for improving the overcharge / quick charge performance of the battery cell 1, additives for improving the high-temperature performance of the battery cell 1, additives for improving the low-temperature performance of the battery cell 1, and the like.

[0084] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0085] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0086] As an example, the polymer of the polymer solid electrolyte may include polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitriles, polyvinylidene fluorides, polymethyl methacrylate, single-ion polymers, polyionic liquids, cellulose, and the like.

[0087] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0088] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0089] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0090] In some embodiments, the electrode assembly is a stacked structure.

[0091] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0092] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0093] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0094] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0095] As an example, the separator can be continuously arranged and arranged between any adjacent positive electrode plates or negative electrode plates in a folded or wound manner.

[0096] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0097] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0098] In some embodiments, the battery cell 1 can include a housing. The housing can 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, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing plays a role in protecting the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0099] As an example, the battery cell 1 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, a multi-prismatic battery cell. The multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc., and there is no special limitation in this application.

[0100] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0101] In some embodiments, at least one pole post is arranged on the housing, and the pole post is electrically connected to the tab. The pole post can be directly connected to the tab or indirectly connected to the tab through a current collector member. The pole post can be arranged on the end cap or on the housing body.

[0102] In some embodiments, a pressure relief mechanism is arranged on the housing. The pressure relief mechanism is used to discharge the internal gas of the battery cell 1.

[0103] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or a channel for the internal pressure or temperature to be released. This threshold design varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode plate, the negative electrode plate, the electrolyte, and the separator in the battery cell 1.

[0104] As an example, the pressure relief mechanism can be integrally formed with the outer casing.

[0105] As an example, the pressure relief mechanism can also be separately provided and connected to the outer casing.

[0106] The "actuation" mentioned in this application refers to the pressure relief mechanism generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 1 can be released. The actions generated by the pressure relief mechanism can include but are not limited to: components in the pressure relief mechanism moving to form an exhaust passage, at least a part of the pressure relief mechanism breaking, shattering, being torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged outward from the actuated part as emissions. In this way, the battery cell 1 can be depressurized and cooled under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0107] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell 1.

[0108] The emissions from the battery cell 1 mentioned in this application include but are not limited to: electrolytes, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0109] The battery device 100 provided in the embodiments of this application includes the battery cell 1 in any one of the embodiments of this application.

[0110] The battery device 100 (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells 1.

[0111] A plurality of battery cells 1 can be connected in series, parallel or in a hybrid connection through a busbar component. The busbar component is used to realize the electrical connection between at least two battery cells 1.

[0112] Exemplarily, a hybrid connection means that there are both series and parallel connections among at least two battery cells 1. At least two battery cells 1 can be directly connected in series, parallel or in a hybrid connection; of course, it can also be that at least two battery cells 1 are first connected in series, parallel or in a hybrid connection to form a module form, and then the modules are connected in series, parallel or in a hybrid connection to form a whole.

[0113] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells 1.

[0114] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 1 to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 1 with cable ties.

[0115] In some embodiments, the battery device 100 can be a battery pack.

[0116] Please refer to Figure 2 and Figure 5 , the battery device 100 can include a box body 3. As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body 3 by fixing the battery module to the box body 3.

[0117] As an example, the battery cell assembly can also be accommodated in the box body 3 by directly fixing a plurality of battery cells 1 to the box body 3.

[0118] In some embodiments, the box body 3 can be part of the chassis structure of a vehicle. For example, a part of the box body 3 can become at least part of the floor of the vehicle, or a part of the box body 3 can become at least part of the cross beam and longitudinal beam of the vehicle.

[0119] The embodiments of the present application provide an electrical device, which includes the battery device 100 in any one of the embodiments of the present application or the heat exchange component 2 in any one of the embodiments of the present application (please refer to Figure 3 ). The battery device 100 is used to store or provide electrical energy.

[0120] The electrical device includes but is not limited to energy storage devices, mobile phones, tablets, laptop computers, electric toys, electric tools, vehicles, ships or spacecrafts, etc. Among them, the vehicle can include battery-powered vehicles and electric vehicles, and the electric toy can include battery-powered vehicle toys and electric vehicle toys, etc., fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys and electric plane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0121] The energy storage device includes but is not limited to energy storage containers or energy storage cabinets, etc.

[0122] In the following embodiments, for the convenience of description, the electrical device in an embodiment of the present application is taken as an example of a vehicle 1000 for description. The following is described with reference to the accompanying drawings.

[0123] Figure 1 It is a schematic structural diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc. AsFigure 1 As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom of the vehicle 1000 or at the front or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0124] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0125] In the related art, during the use of the battery device, the temperature of the battery cell in the battery device will rise, and the temperature of the battery cell needs to be controlled. The heat exchange component is used to exchange heat with the battery cell to adjust the temperature of the battery cell. For example, when the temperature of the battery cell rises, the heat exchange component absorbs the heat of the battery cell to dissipate the heat and cool the battery cell. When the external environment temperature is low and the battery cell needs to be heated, the heat exchange component releases heat to the battery cell. In some cases, the pole of the battery cell faces the top side. When the temperature of the battery cell rises, the temperature of the part of the battery cell near the pole is higher than that of other parts. The heat exchange component is set on the bottom side of the battery cell. Due to the existence of thermal resistance, the heat exchange component on the bottom side cannot cool the top of the battery cell in time. The battery cell has a temperature gradient along the top and bottom directions, which affects the use of the battery device. In addition, the heat exchange component usually uses a hard aluminum plate, and the aluminum plate is in contact with the surface of the battery cell. During the use of the battery device, water is used as a heat exchange medium to flow through the above-mentioned aluminum plate, thereby taking away the heat from the battery cell and cooling the battery cell. However, the above-mentioned aluminum plate has the problem of being heavy, and the water is in contact with the aluminum plate for a long time, and the aluminum plate is exposed to the environment, which increases the risk of corrosion of the aluminum plate.

[0126] In view of this, an embodiment of the present application provides a battery device, which includes a box, at least two battery cells and a heat exchange assembly, wherein the at least two battery cells are located in the box, the heat exchange assembly is arranged on the top of the box, and the heat exchange assembly includes at least two heat exchange parts, at least one heat exchange part is arranged as a flexible part, and at least one heat exchange part is arranged as a rigid part, and the flexible part and the rigid part are stacked to form a medium flow channel, the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells. Among them, at least a part of the surface of at least one of the flexible part and the rigid part has an anti-corrosion layer.

[0127] In the battery device provided by the embodiment of the present application, the heat exchange component is used for heat exchange with the battery cell. By setting the heat exchange component to include a flexible member and a rigid member, the flexible member has a relatively light mass, which is beneficial to reducing the mass of the heat exchange component, reducing the production cost of the heat exchange component, and is also beneficial to reducing the mass of the battery device. The flexible member and the rigid member are stacked to form at least one medium flow channel. The rigid member can support the flexible member, which is beneficial to improving the overall structural strength and stability of the heat exchange component and improving the applicability of the heat exchange component. The temperature on the top side of the battery cell is relatively higher. The heat exchange component is arranged on the top of the box body, and the heat exchange component is closer to the part with a relatively higher temperature of the battery cell, so as to cool the high-temperature side of the battery cell faster, reduce the temperature of the high-temperature area of the battery cell, improve the heat exchange efficiency, and solve the problem of large temperature difference between the top and bottom of the battery cell to a certain extent. At least part of the surface of at least one of the flexible member and the rigid member has an anti-corrosion layer, and the anti-corrosion layer provides an anti-corrosion function, improves the anti-corrosion performance of the heat exchange component, and improves the tolerance of the heat exchange component to corrosive substances such as heat exchange media and substances in the environment, thereby improving the reliability of the heat exchange component.

[0128] The following further elaborates on the battery device 100 provided by the embodiment of the present application with reference to the accompanying drawings. Please refer to Figures 1 to 7 , the embodiment of the present application provides a battery device 100. The battery device 100 includes at least two battery cells 1, a heat exchange component 2, and a box body 3. At least two battery cells 1 are located inside the box body 3.

[0129] Please refer to Figures 2 to 5 , the heat exchange component 2 is arranged on the top of the box body 3.

[0130] Please refer to Figures 3 to 7 , the heat exchange component 2 provided by the embodiment of the present application includes at least two heat exchange members. At least one heat exchange member is set as a flexible member 21, and at least one heat exchange member is set as a rigid member 22. The flexible member 21 and the rigid member 22 are stacked to form a medium flow channel 2a. The medium flow channel 2a is used to conduct the heat exchange medium, and the heat exchange medium is used for heat exchange with at least two battery cells 1. Among them, at least part of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201.

[0131] The flexibility in the flexible member 21 refers to the material characteristics of the structure. Such characteristics can be the properties given to the material due to the relatively light mass of the material, or can be the properties given to the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, and elongation at break of the material. As an example, the material of the flexible member 21 can be selected as a material with a relatively light mass compared to conventional structures such as aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of the material of the flexible member 21. By setting the heat exchange component 2 in the form including the flexible member 21 in the embodiment of the present application, it is beneficial to reduce the weight of the heat exchange component 2.

[0132] The rigidity in the rigid member 22 refers to the material property of the structure. This type of property can be the property endowed to the material due to the relatively heavy mass of the material, or can be the property endowed to the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, fracture elongation rate, etc. of the material. As an example, the material of the rigid member 22 can be selected as metal plates such as conventional aluminum plates, steel plates, etc., or materials of structures such as composite material plates, and its rigidity can be controlled by the thickness, width, length, and type of the material of the rigid member 22. In the embodiment of the present application, by setting the heat exchange assembly 2 to include the rigid member 22, it can play a supporting role for the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange assembly 2.

[0133] After the rigid member 22 is manufactured and formed, that is, after plastic deformation is completed, under normal use conditions, its shape can be basically maintained without change. After the flexible member 21 is manufactured and formed, that is, after plastic deformation is completed, under normal use conditions, it can undergo elastic deformation, that is to say, its shape can change.

[0134] By setting the heat exchange assembly 2 to include the flexible member 21 and the rigid member 22, while enabling the heat exchange assembly 2 to have a flexible function, it can also enable the heat exchange assembly 2 to have a certain structural strength.

[0135] The flexible member 21 and the rigid member 22 are stacked to form the medium flow channel 2a, which means that the heat exchange assembly 2 forms the medium flow channel 2a between the flexible member 21 and the rigid member 22. In other words, the flexible member 21 constitutes at least part of the side wall of the medium flow channel 2a, and the rigid member 22 also constitutes at least part of the side wall of the medium flow channel 2a. The heat exchange medium circulates in the medium flow channel 2a to achieve heat exchange with the battery cell 1.

[0136] It should be noted that the specific type of the heat exchange medium is not limited herein, as long as it can achieve a heat exchange effect on the battery cell 1. For example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is taken as a coolant as an example for description.

[0137] It should be noted that the specific number of the medium flow channels 2a is not limited herein. It can be one or multiple.

[0138] The heat exchange assembly 2 includes at least two heat exchange members, that is to say, the number of the heat exchange members is multiple.

[0139] At least one heat exchange member being set as the flexible member 21 means that the number of the flexible members 21 is one or multiple. In the embodiment where multiple heat exchange members are set as the flexible members 21, each flexible member 21 can be the same or different.

[0140] At least one heat exchange member is provided as a rigid member 22, which means that the number of rigid members 22 is one or more. In embodiments where multiple heat exchange members are provided as rigid members 22, the rigid members 22 can be the same or different.

[0141] Exemplarily, the heat exchange assembly 2 includes two heat exchange members, one of which is a flexible member 21 and the other is a rigid member 22.

[0142] Exemplarily, the rigid member 22 is a rigid plate-like structure, which can support the flexible member 21, thereby facilitating the improvement of the overall structural strength and stability of the heat exchange assembly 2.

[0143] The heat exchange assembly 2 is provided on the top of the box body 3. The top of the box body 3 is the part of the box body 3 away from the ground.

[0144] As an example, the heat exchange assembly 2 is provided on the top side X1 of at least two battery cells 1, which means that the heat exchange assembly 2 is located on the side of at least two battery cells 1 away from the ground.

[0145] It should be noted that the top side X1 and the bottom side X2 are two opposite sides in the top-bottom direction X. For example, the top side X1 can be the direction where the pole columns of the battery cell 1 are located. Usually, the bottom side X2 faces the ground and the top side X1 faces the sky.

[0146] At least part of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201. As an example, in some embodiments, part or all of the surface of the flexible member 21 has an anti-corrosion layer 201; in some other embodiments, part or all of the surface of the rigid member 22 has an anti-corrosion layer 201; in still some other embodiments, at least part of the surface of the flexible member 21 and at least part of the surface of the rigid member 22 both have an anti-corrosion layer 201.

[0147] The anti-corrosion layer 201 has an anti-corrosion function, and the anti-corrosion function means that the anti-corrosion layer 201 can withstand the heat exchange medium and / or the components in the environment and does not react chemically with the heat exchange medium and / or the components in the environment.

[0148] The battery device 100 provided by the embodiment of the present application, the heat exchange component 2 is used to exchange heat with the battery cell 1. By setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 has a relatively light mass, which is beneficial to reducing the mass of the heat exchange component 2, reducing the production cost of the heat exchange component 2, and is also beneficial to reducing the mass of the battery device 100. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2 and improving the applicability of the heat exchange component 2. The temperature of the top side X1 of the battery cell 1 is relatively higher. The heat exchange component 2 is arranged on the top of the box body 3. The heat exchange component 2 is closer to the part of the battery cell 1 with a relatively higher temperature, cooling the high-temperature side of the battery cell 1 faster, reducing the temperature of the high-temperature area of the battery cell 1, and improving the heat exchange efficiency, and to a certain extent solving the problem of large temperature difference in the X direction between the top and bottom of the battery cell 1. At least part of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201. The anti-corrosion layer 201 provides an anti-corrosion function, improves the anti-corrosion performance of the heat exchange component 2, improves the tolerance of the heat exchange component 2 to corrosive substances such as heat exchange media and substances in the environment, and thus improves the reliability of the heat exchange component 2.

[0149] In some embodiments, please refer to Figures 2 to 5 , the battery device 100 includes a box body 3 having a top cover 31, at least two battery cells 1 are located in the box body 3, and the heat exchange component 2 is integrated into the top cover 31.

[0150] The box body 3 can be used to contain the battery cell 1 and other structural members, provide protection for the battery cell 1 and other structural members, and reduce the influence of foreign objects outside the box body 3 on the charging or discharging of the battery cell 1.

[0151] The heat exchange component 2 is integrated into the top cover 31, that is to say, the heat exchange component 2 is connected to the top cover 31 or the heat exchange component 2 can be a part of the structure of the top cover 31. In this way, the top cover 31 can provide support for the heat exchange component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0152] As an example, the heat exchange component 2 and the top cover 31 can be connected by non-detachable connection or detachable connection and other methods.

[0153] Unless otherwise specified, in the present application, non-detachable connections include but are not limited to welding and / or bonding, etc., and detachable connections include but are not limited to screw connections, bolt connections and / or snap connections, etc.

[0154] In this embodiment, the heat exchange component 2 is integrated into the top cover 31, the heat exchange component 2 is connected to the top cover 31 or the heat exchange component 2 can be a part of the structure of the top cover 31. The top cover 31 can provide support for the heat exchange component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0155] The shape of the box body 3 is not limited. Exemplarily, the box body 3 can be a simple three-dimensional structure such as a separate hexahedron, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a hexahedron, cylinder, or sphere. In one example, the box body 3 can be rectangular parallelepiped-shaped, the length direction and the width direction of the box body 3 are both parallel to the horizontal plane, and the length direction of the box body 3 is parallel to the longest side of the rectangular parallelepiped.

[0156] The material of the box body 3 is not limited. Exemplarily, the material of the box body 3 can be a metal material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber reinforced epoxy resin.

[0157] Exemplarily, the heat exchange component 2 further includes an inlet and an outlet, and both the inlet and the outlet are communicated with the medium flow channel 2a. Here, the inlet and the outlet of the heat exchange component 2 are used for connecting with the pipelines of the liquid storage devices such as the air conditioning system or the water tank of the whole vehicle or the electrical device.

[0158] Exemplarily, please refer to Figures 2 to 6 , the heat exchange component 2 further includes a connector 23 having an inlet and a connector 23 having an outlet, and the connector 23 is connected to the rigid member 22.

[0159] Exemplarily, the connector 23 is brazed to the rigid member 22.

[0160] Exemplarily, the connector 23 is, for example, a water nozzle.

[0161] The principle of the heat exchange component 2 for heat exchanging the battery cell 1 is as follows: the heat exchange medium output by a heat exchange medium source (not shown in the figure) enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium exchanges heat with the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heat exchange of the battery cell 1.

[0162] Here, the heat exchange component 2 for heat exchanging the battery cell 1 can dissipate heat from the battery cell 1 or can also heat the battery cell 1.

[0163] The principle of the heat exchange component 2 for dissipating heat from the battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium absorbs the heat generated during the operation of the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, releasing heat and completing the cooling and heat dissipation of the battery cell 1.

[0164] The principle of the heat exchange component 2 for heating the battery cell 1 is as follows: The heat exchange medium output by the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. The heat exchange medium transfers heat to the battery cell 1 to heat the battery cell 1. After that, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heating of the battery cell 1.

[0165] In some embodiments, the elongation at break of the flexible member 21 is greater than that of the rigid member 22.

[0166] The elongation at break is a percentage index of the elongation amount to the original length when the material is stretched and fractured. It is used to measure the deformation ability that the material can withstand during the stretching process, that is, the elongation at break represents the ductility of the material when it is stressed and stretched.

[0167] The elongation at break of the flexible member 21 is greater than that of the rigid member 22. In other words, when stressed and stretched, the ductility of the flexible member 21 is greater than that of the rigid member 22, which is beneficial to improving the impact resistance, buffering performance and puncture resistance of the heat exchange component 2.

[0168] Exemplarily, at normal temperature and pressure, the elongation at break of the flexible member 21 and the rigid member 22 can be measured by the tensile test method or the drop hammer test method. The measuring instrument can include a universal testing machine.

[0169] In some embodiments, the elongation at break of the flexible member 21 is in the range of 30% to 300%.

[0170] The elongation at break of the flexible member 21 can be a point value of any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or a point value between any two of them.

[0171] In this embodiment, by setting the elongation at break of the flexible member 21 in the range of 30% to 300%, the flexible member 21 can have a certain impact resistance and puncture resistance while having a certain structural strength.

[0172] In some embodiments, the elongation at break of the rigid member 22 is in the range of 1% to 50%.

[0173] The elongation at break of the rigid member 22 can be a point value of any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or a point value between any two of them.

[0174] In this embodiment, by setting the fracture elongation rate of the rigid member 22 to be in the range of 1% to 50%, the rigid member 22 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 2.

[0175] In some embodiments, the elastic modulus of at least a part of the flexible member 21 is less than that of the rigid member 22.

[0176] Here, it can be that the elastic modulus of a part of the flexible member 21 is less than that of the rigid member 22, or it can be that the elastic modulus of all regions of the flexible member 21 is less than that of the rigid member 22.

[0177] In this way, while enabling the heat exchange assembly 2 to have a flexible function, the heat exchange assembly 2 can also have a certain structural strength.

[0178] The elastic modulus describes the magnitude of the unit strain caused by the unit stress when a solid is stressed within a certain range, and it is one of the basic physical quantities of materials. The larger the elastic modulus, the greater the stiffness of the material and the stronger the compressive capacity. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0179] The measurement methods of the elastic modulus of the flexible member 21 and the rigid member 22 can include at least one of the static tensile test method, the dynamic test method, the sound velocity method, the nanoindentation method, and the bending method. The measuring instruments can include a nanoindenter and a universal testing machine.

[0180] Exemplarily, at normal temperature and pressure, the elastic modulus of the flexible member 21 and the rigid member 22 can be measured by the nanoindentation method. The nanoindentation method uses a tiny indenter to indent the surface of the flexible member 21, and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0181] In some embodiments, please refer to Figure 2 and Figure 3 , the rigid member 22 is configured as the top cover 31. In other words, the rigid member 22 replaces the traditional top cover 31 and becomes a part of the structure of the box body 3.

[0182] In this embodiment, the rigid member 22 is configured as the top cover 31. As a part of the box body 3, the rigid member 22 can save some structures, reduce costs, and also reduce the overall weight of the battery device 100.

[0183] In some embodiments, please refer to Figure 5 and Figure 6 , the rigid member 22 is disposed on the bottom side X2 of the top cover 31. In other words, the box body 3 has an independent top cover 31, and the rigid member 22 can be fixed to the bottom side X2 of the top cover 31.

[0184] As an example, the rigid member 22 can be fixed to the bottom side X2 of the top cover 31 by non-detachable connection or detachable connection.

[0185] In this embodiment, the rigid member 22 is disposed on the bottom side X2 of the top cover 31, and the heat exchange assembly 2 can be entirely located within the box body 3. The top cover 31 can shield the rigid member 22, thereby better protecting the heat exchange assembly 2.

[0186] In some embodiments, referring to Figure 5 and Figure 6 , the box body 3 includes an annular frame 32 and a bottom guard plate 33. The annular frame 32 has a top side opening and a bottom side opening; the rigid member 22 closes the top side opening of the annular frame 32; the bottom guard plate 33 closes the bottom side opening of the annular frame 32. Thus, the rigid member 22, the annular frame 32, and the bottom guard plate 33 jointly define a receiving cavity, and at least two battery cells 1 are located within the receiving cavity.

[0187] In this embodiment, the rigid member 22 replaces the original top cover 31 of the box body 3, reducing the components of the battery device 100. The rigid member 22 forms a part of the box body 3, which can reduce the overall weight of the battery device 100.

[0188] As an example, the rigid member 22 and the annular frame 32 can be welded or connected by fasteners. The fasteners include but are not limited to screws or bolts, etc.

[0189] The annular frame 32 can be generally in the shape of a square ring, a rectangular ring, or an annular shape of other shapes. In some embodiments, the annular frame 32 can include four side plates. The side plates can be extruded plate-shaped profiles, and the four side plates are welded together in sequence along the circumferential direction to form the annular frame 32.

[0190] The receiving cavity can be a sealed space or a non-sealed space.

[0191] The bottom guard plate 33 can be welded to the annular frame 32 or connected by fasteners.

[0192] In this embodiment, the rigid member 22 replaces the cover plate, and the flexible member 21 is connected to the bottom side X2 of the rigid member 22 and is located within the receiving cavity, reducing the risk of impurities or other objects contacting the flexible member 21.

[0193] In some other examples, the heat exchange assembly 2 can be located within the receiving cavity, and the rigid member 22 is disposed on the bottom side X2 of the top cover 31.

[0194] In this embodiment, the heat exchange assembly 2 is entirely located within the receiving cavity. The box body 3 can protect the heat exchange assembly 2, reducing the risk of impurities or other objects contacting the heat exchange assembly 2.

[0195] In some embodiments, referring to Figure 2 and Figure 3, the box body 3 includes a box main body 34 which is open towards the top side. The rigid member 22 can close the top side opening of the box main body 34 to jointly define an accommodation cavity, and at least two battery cells 1 are located in the accommodation cavity.

[0196] In this embodiment, the rigid member 22 can close the top side opening of the box main body 34. The rigid member 22 serves as the top cover 31 of the box body 3, which can reduce the overall package weight of the battery device 100.

[0197] In some embodiments, refer to Figure 4 , an anti-corrosion layer 201 is covered on the top surface of the rigid member 22.

[0198] The top surface of the rigid member 22 is the surface of the rigid member 22 facing away from the battery cell 1.

[0199] That the top surface of the rigid member 22 is covered with the anti-corrosion layer 201 means that part or all of the top surface of the rigid member 22 is covered with the anti-corrosion layer 201.

[0200] As an example, the rigid member 22 is configured as the top cover 31, and an anti-corrosion layer 201 is covered on the top surface of the rigid member 22. In this example, the top surface of the rigid member 22 is exposed to the environment and is likely to come into contact with corrosive substances in the environment.

[0201] In this embodiment, the top surface of the rigid member 22 is covered with the anti-corrosion layer 201. The anti-corrosion layer 201 can isolate the environment and at least part of the top surface of the rigid member 22, reducing the risk of the top surface of the rigid member 22 being corroded.

[0202] In some embodiments, at least part of the circumferential surface of the rigid member 22 can also be covered with the anti-corrosion layer 201. The circumferential surface of the rigid member 22 refers to the surface of the rigid member 22 surrounding the straight line extending along the top-bottom direction X. Designed in this way, the anti-corrosion layer 201 can isolate the environment and at least part of the circumferential surface of the rigid member 22, reducing the risk of the circumferential surface of the rigid member 22 being corroded.

[0203] In some embodiments, refer to Figure 4 , at least part of the surface of the rigid member 22 forming the medium flow channel 2a is covered with the anti-corrosion layer 201.

[0204] As an example, part of the surface of the rigid member 22 forming the medium flow channel 2a is covered with the anti-corrosion layer 201, or all of the surface of the rigid member 22 forming the medium flow channel 2a is covered with the anti-corrosion layer 201.

[0205] In this embodiment, at least part of the surface of the rigid member 22 forming the medium flow channel 2a is covered with the anti-corrosion layer 201, improving the situation where the heat exchange medium damages the rigid member 22, which is beneficial to improving the reliability of the heat exchange component 2.

[0206] In some embodiments, refer to Figure 4, all surfaces of the rigid member 22 facing the flexible member 21 are covered with an anti-corrosion layer 201.

[0207] In this embodiment, all surfaces of the rigid member 22 facing the flexible member 21 are covered with an anti-corrosion layer 201, which can reduce the manufacturing difficulty of the anti-corrosion layer 201.

[0208] In some embodiments, the rigid member 22 may only cover the anti-corrosion layer 201 on the surface constituting the medium flow channel 2a, and the surface of the rigid member 22 that does not constitute the medium flow channel 2a may or may not be covered with the anti-corrosion layer 201.

[0209] In some embodiments, the anti-corrosion layer 201 is hot-pressed onto the surface of the rigid member 22.

[0210] Exemplarily, the anti-corrosion layer 201 may be a separately manufactured mold layer, and the anti-corrosion layer 201 is assembled onto the surface of the rigid member 22 through a hot-pressing process.

[0211] The anti-corrosion layer 201 may also be assembled onto the surface of the rigid member 22 by bonding or other means.

[0212] In this embodiment, the anti-corrosion layer 201 is hot-pressed onto the surface of the rigid member 22. That is to say, the anti-corrosion layer 201 and the rigid member 22 are connected by a hot-pressing process. This forming method is simple and does not require spraying or electrophoresis processes, and the forming effect is better.

[0213] It can be understood that in some embodiments, the anti-corrosion layer 201 may be a coating structure. That is to say, the anti-corrosion layer 201 adheres to the surface of the heat exchange component 2 through intermolecular forces. In this way, the anti-corrosion layer 201 has strong adhesion and can reduce the risk of the insulating member falling off from the bottom surface of the heat exchange component 2.

[0214] The attachment method of the anti-corrosion layer 201 is not limited. Exemplarily, the attachment methods of the anti-corrosion layer 201 include but are not limited to spraying, brushing, or electrophoresis, etc.

[0215] In some embodiments, please refer to Figure 4 and Figure 7 , the anti-corrosion layer 201 is in a single-layer or multi-layer laminated structure.

[0216] In this embodiment, the anti-corrosion layer 201 is in a single-layer or multi-layer laminated structure, and the number of layers and materials of the anti-corrosion layer 201 can be designed according to anti-corrosion requirements.

[0217] The laminated structure refers to a structure in which one or more layers are spread in a plane or curved surface form, and the multiple layers can be parallel to each other or stacked regularly.

[0218] In some embodiments, the anti-corrosion layer 201 is made of one of polypropylene, polyethylene, and polyamide.

[0219] Polypropylene (PP for short) is a semi-crystalline thermoplastic made from propylene monomers through addition polymerization.

[0220] Polyethylene (PE for short) is a thermoplastic resin material made from ethylene monomers through polymerization.

[0221] Polyamide (PA for short) is a general term for thermoplastic resins with repeating amide groups (—[NHCO]—) in the main molecular chain.

[0222] As an example, the anticorrosion layer 201 may include only one of the polypropylene layer, polyethylene layer, and polyamide layer. That is to say, the anticorrosion layer 201 is a single-layer laminated structure.

[0223] As an example, when the anticorrosion layer 201 uses multiple of polypropylene, polyethylene, and polyamide, the anticorrosion layer 201 may include at least two of the polypropylene layer, polyethylene layer, and polyamide layer laminated and formed. That is to say, the anticorrosion layer 201 is a multi-layer laminated structure. In this way, the anticorrosion layer 201 can provide good waterproofing and / or corrosion resistance to heat exchange media.

[0224] In this embodiment, when the anticorrosion layer 201 uses one of polypropylene, polyethylene, and polyamide, the anticorrosion layer 201 can provide good waterproofing and / or corrosion resistance to heat exchange media.

[0225] In some embodiments, please refer to Figure 4 and Figure 7 , the flexible member 21 is a laminated structure. The flexible member 21 includes a metal layer 211 and two anticorrosion layers 201, and the metal layer 211 is laminated between the two anticorrosion layers 201.

[0226] The metal layer 211 is a structure formed by spreading a metal material.

[0227] The anticorrosion layer 201 is a structure with anticorrosion function.

[0228] It can be understood that the two anticorrosion layers 201 can be made of the same material or different materials.

[0229] In this embodiment, the flexible member 21 can provide plasticity through the metal layer 211, enabling the flexible member 21 to maintain its basic shape. The metal layer 211 is laminated between the two anticorrosion layers 201, and the two anticorrosion layers 201 can encapsulate the metal layer 211 to prevent the metal layer 211 from contacting the heat exchange medium and corrosive substances in the environment, improving the corrosion resistance of the flexible member 21.

[0230] In some embodiments, please refer to Figure 4, both surfaces of the rigid member 22 along the stacking direction are completely covered by the anti-corrosion layer 201. The flexible member 21 includes a metal layer 211 and two anti-corrosion layers 201, and the metal layer 211 is stacked between the two anti-corrosion layers 201. In this way, the anti-corrosion performance of the rigid member 22 and the flexible member 21 can be improved.

[0231] It should be noted that the anti-corrosion layer 201 of the rigid member 22 and the anti-corrosion layer 201 of the flexible member 21 can be made of the same material or different materials.

[0232] In some embodiments, please refer to Figures 2 to 4 , the flexible member 21 is located on the bottom side X2 of the rigid member 22, and the flexible member 21 is in contact with or connected to the battery cell 1 through a heat conduction structure.

[0233] If the flexible member 21 is located on the bottom side X2 of the rigid member 22, then the flexible member 21 is located on the side of the rigid member 22 close to the battery cell 1.

[0234] When the flexible member 21 is in contact with the battery cell 1, the flexible member 21 has flexibility and can undergo elastic deformation. The flexible member 21 can be pressed tightly against the battery cell 1. In this way, the flexible member 21 can better fit the battery cell 1 and increase the heat exchange area.

[0235] When the flexible member 21 is connected to the battery cell 1 through a heat conduction structure, the heat conduction structure refers to a structure made of a good heat conductor. Exemplarily, the heat conduction coefficient of the heat conduction structure is not less than 30 W / (m·K). The heat conduction structure has good heat conduction performance and connection function. The heat conduction structure can establish a heat conduction path between the flexible member 21 and the battery cell 1 and improve the heat exchange efficiency.

[0236] The specific material of the heat conduction structure is not limited. Exemplarily, the heat conduction structure includes but is not limited to heat conduction adhesive, etc.

[0237] In this embodiment, the flexible member 21 is in contact with the battery cell 1, and the flexible member 21 can better fit the battery cell 1 and increase the heat exchange area. The flexible member 21 is connected to the battery cell 1 through a heat conduction structure, and the heat conduction structure has good heat conduction performance. The heat conduction structure can establish a heat conduction path between the flexible member 21 and the battery cell 1 and improve the heat exchange efficiency.

[0238] In some embodiments, the flexible member 21 and the rigid member 22 are hot-pressed to form a hot-pressed area and a medium flow channel 2a, and at least part of the area of the flexible member 21 and the rigid member 22 in the hot-pressed area is connected to each other.

[0239] That is to say, the flexible member 21 and the rigid member 22 are connected by hot pressing, and a hot-pressed area and a medium flow channel 2a are formed by hot pressing. This forming method is simple.

[0240] Here, the flexible member 21 is sealed by a hot pressing process. Through the hot pressing process, the sealing performance of the heat exchange component 2 can be effectively ensured, and it is not easy to crack.

[0241] In this embodiment, the flexible member 21 is sealed by a hot pressing process, that is, a hot pressing area is formed through hot pressing. The hot pressing area divides the heat exchange component 2 to form at least one medium flow channel 2a. This forming method is simple.

[0242] Exemplarily, the hot pressing area includes a heat sealing area and a non - heat sealing area. The non - heat sealing area and the medium flow channel 2a are respectively located on both sides of the heat sealing area, which is beneficial to reducing the width of the heat sealing area and improving the problem of excessive temperature caused by too wide a heat sealing area, affecting the hot pressing quality and damaging the flexible member 21. In addition, the non - heat sealing area can also form a stress - release buffer zone when the flexible member 21 is folded, improving the situation where stress concentration occurs in the heat sealing area and causing damage to the heat sealing area.

[0243] In the related art, the heat exchange component is formed by welding two high - strength aluminum alloys. For high - strength aluminum alloys (such as 5 - series, 6 - series, etc.), due to the relatively high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0244] In the embodiment of the present application, by setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 and the rigid member 22 form a hot pressing area and a medium flow channel 2a through hot pressing. The hot pressing temperature (150°C ± 10°C) is lower than the brazing temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improving the structural strength of the heat exchange component 2.

[0245] In some embodiments, the flexible member 21 is in the form of a single - layer or multi - layer thin film.

[0246] In some embodiments, the flexible member 21 includes a metal plasticized film.

[0247] Here, the metal plasticized film is a metal - plastic composite material, that is, it includes a metal layer 211 and a plastic layer.

[0248] In this embodiment, since the metal plasticized film has a thin thickness and small weight, and by forming a medium flow channel 2a between the metal plasticized film and the rigid member 22, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 2 can be reduced. At the same time, because the metal plasticized film has the characteristics of insulation and anti - corrosion of the heat exchange medium, the possibility of insulation failure can be reduced, and the risk of reaction between the heat exchange component 2 and the heat exchange medium flowing inside can also be reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0249] In some embodiments, the flexible member 21 includes an aluminum plastic film.

[0250] In this embodiment, the flexible member 21 is made of an aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the requirements of insulation and anti-corrosion.

[0251] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer 211 and a non-metal layer, and the metal layer 211 and the non-metal layer are stacked in sequence.

[0252] Here, the flexible member 21 includes a metal layer 211 and a non-metal layer, that is, a composite member composed of the metal layer 211 and the non-metal layer.

[0253] Exemplarily, the metal layer 211 and the non-metal layer can be formed by hot pressing or hot melting.

[0254] Here, the numbers of the metal layer 211 and the non-metal layer are not limited.

[0255] In this embodiment, the flexible member 21 formed by stacking the metal layer 211 and the non-metal layer in sequence has a thin thickness and a small weight. Moreover, by forming a dielectric flow channel 2a between the flexible member 21 and the rigid member 22, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 2 can be reduced. In addition, the heat exchange component 2 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0256] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer 211 and a non-metal layer, and the metal layer 211 and the non-metal layer are stacked in sequence, wherein the non-metal layer is disposed on the side of the metal layer 211 facing the rigid member 22.

[0257] That is to say, the non-metal layer is located between the metal layer 211 and the rigid member 22.

[0258] Here, by disposing the non-metal layer on the side of the metal layer 211 facing the rigid member 22, the non-metal layer can be thermally pressed and connected to the rigid member 22.

[0259] In some embodiments, the metal layer 211 includes one of aluminum foil, copper foil, and steel foil.

[0260] In this embodiment, by setting the metal layer 211 as one of aluminum foil, copper foil, and steel foil, the flexible member 21 can have a certain structural strength and can play an isolation role.

[0261] In some embodiments, the metal layer 211 includes multiple of aluminum foil, copper foil, and steel foil.

[0262] In some embodiments, the non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0263] In this embodiment, by setting the non-metal layer as one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 21 can have certain waterproof function and / or performance of resisting corrosion by heat exchange medium.

[0264] In some embodiments, the non-metal layer includes multiple ones of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene. Thus, the flexible member 21 has certain waterproof function and / or performance of resisting corrosion by heat exchange medium.

[0265] Exemplarily, a non-metal layer made of a corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or in other words, additives are added to the non-metal layer to make the non-metal layer have acid and alkali corrosion resistance.

[0266] In some embodiments, the non-metal layer is a hot melt layer.

[0267] In this embodiment, by setting the non-metal layer as a hot melt layer, that is, composed of a hot melt material, it is beneficial to make the non-metal layer and the metal layer 211 be compounded together through hot melting, with simple molding and high production efficiency.

[0268] In some embodiments, the thickness of the flexible member 21 is 0.05 mm - 1 mm.

[0269] Exemplarily, the thickness of the flexible member 21 is any point value among 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm or any point value between any two of them.

[0270] In this embodiment, by setting the thickness of the flexible member 21 as 0.05 mm - 1 mm, while the heat exchange assembly 2 made of the flexible member 21 has certain structural strength, the overall thickness of the heat exchange assembly 2 is relatively small, which is beneficial to reducing the overall volume and weight of the battery device 100 so as to increase the energy density of the battery device 100.

[0271] In some embodiments, the thickness of the flexible member 21 is 0.08 mm - 0.2 mm.

[0272] Exemplarily, the thickness of the flexible member 21 is any point value among 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or any point value between any two of them.

[0273] In this embodiment, by setting the thickness of the flexible member 21 to be 0.08 mm - 0.2 mm, while the heat exchange assembly 2 made of the flexible member 21 has a certain structural strength, further, the overall thickness of the heat exchange assembly 2 is relatively small, which is beneficial to further reducing the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0274] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa - 10,000 MPa.

[0275] Exemplarily, the elastic modulus of the flexible member 21 can be any point value among 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, 10,000 MPa or any point value between any two of them.

[0276] In this embodiment, by setting the elastic modulus of the flexible member 21 to be 0.1 MPa - 10,000 MPa, not only does the flexible member 21 have a certain structural strength, improving the reliability of the heat exchange assembly 2, but also it has a certain deformation ability, which can enhance the fitting degree between the heat exchange assembly 2 and the box body 3 and / or the battery cell 1, thereby increasing the effective heat exchange area between the heat exchange assembly 2 and the box body 3 and / or the battery cell 1, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 2.

[0277] In some embodiments, the rigid member 22 is set as a metal plate.

[0278] Exemplarily, for example, it can be an aluminum alloy.

[0279] In this embodiment, by setting the rigid member 22 as a metal plate, the metal plate not only has good structural strength but also has good heat conduction performance. That is to say, while meeting a certain heat exchange efficiency of the heat exchange assembly 2, the rigid member 22 can also play a certain supporting role for the flexible member 21.

[0280] In some embodiments, the medium flow channel 2a includes a plurality of sub - flow channels. Each battery cell 1 corresponds to a plurality of sub - flow channels, and the extending direction of the sub - flow channels corresponding to the battery cell 1 is perpendicular to the length direction of the battery cell 1.

[0281] Multiple sub-channels are connected to form the medium flow channel 2a.

[0282] The extending direction of the sub-channel is perpendicular to the length direction of the battery cell 1. That is to say, multiple sub-channels are arranged along the length direction of the battery cell 1. In this way, the length direction of the battery cell 1 corresponds to multiple sub-channels.

[0283] It can be understood that along the flowing direction of the heat exchange medium, the temperature of the heat exchange medium will gradually increase. Therefore, by corresponding each battery cell 1 to multiple sub-channels, it is beneficial to improve the temperature uniformity of the battery cell 1.

[0284] The following further illustrates the battery device 100 provided by the embodiments of the present application with a specific embodiment. Please refer to Figures 2 to 4 , the battery device 100 includes at least two battery cells 1, a heat exchange component 2, and a box body 3 having a top cover 31. The heat exchange component 2 is disposed on the top side X1 of at least two battery cells 1. The heat exchange component 2 includes at least two heat exchange members. At least one heat exchange member is set as a flexible member 21, and at least one heat exchange member is set as a rigid member 22. The flexible member 21 and the rigid member 22 are stacked to form the medium flow channel 2a. The medium flow channel 2a is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1. At least two battery cells 1 are located in the box body 3, and the heat exchange component 2 is integrated into the top cover 31. The top surface of the rigid member 22 is covered with an anti-corrosion layer 201. The anti-corrosion layer 201 is hot-pressed onto the surface of the rigid member 22. All surfaces of the rigid member 22 facing the flexible member 21 are covered with the anti-corrosion layer 201. The flexible member 21 is a layered structure. The flexible member 21 includes a metal layer 211 and two anti-corrosion layers 201. The metal layer 211 is stacked between the two anti-corrosion layers 201. The flexible member 21 includes an aluminum-plastic film.

[0285] In this embodiment, the heat exchange component 2 is used to exchange heat with the battery cell 1. By setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 has a relatively light mass, which is beneficial to reducing the mass of the heat exchange component 2, reducing the production cost of the heat exchange component 2, and also beneficial to reducing the mass of the battery device 100. The rigid member 22 can enhance the structural strength of the heat exchange component 2, so as to facilitate the heat exchange component 2 to better carry the battery cell 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2 and improving the applicability of the heat exchange component 2. The temperature of the top side X1 of the battery cell 1 is relatively higher. The heat exchange component 2 is arranged on the top side X1 of at least two battery cells 1. The heat exchange component 2 is closer to the part of the battery cell 1 with a relatively higher temperature, which can cool the high-temperature side of the battery cell 1 faster, reduce the temperature of the high-temperature area of the battery cell 1, and improve the heat exchange efficiency, and to a certain extent solve the problem of large temperature difference in the X direction between the top and bottom of the battery cell 1. At least part of the surface of at least one of the flexible member 21 and the rigid member 22 has an anti-corrosion layer 201. The anti-corrosion layer 201 provides an anti-corrosion function, improves the anti-corrosion performance of the heat exchange component 2, and improves the tolerance of the heat exchange component 2 to corrosive substances such as heat exchange media and substances in the environment, thereby improving the reliability of the heat exchange component 2. The heat exchange component 2 is integrated into the top cover 31. The heat exchange component 2 is connected to the top cover 31 or the heat exchange component 2 can be a part of the structure of the top cover 31. The top cover 31 can provide support for the heat exchange component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100. The top surface of the rigid member 22 is covered with the anti-corrosion layer 201. The anti-corrosion layer 201 can isolate the environment and at least part of the top surface of the rigid member 22, reducing the risk of the top surface of the rigid member 22 being corroded. All the surfaces of the rigid member 22 facing the flexible member 21 are covered with the anti-corrosion layer 201, which can reduce the manufacturing difficulty of the anti-corrosion layer 201. The anti-corrosion layer 201 is hot-pressed onto the surface of the rigid member 22. That is to say, the anti-corrosion layer 201 and the rigid member 22 are connected by a hot-pressing process. This forming method is simple and does not require spraying or electrophoresis processes, and the forming effect is better. The flexible member 21 can provide plasticity through the metal layer 211, enabling the flexible member 21 to maintain its basic shape. The metal layer 211 is stacked between two anti-corrosion layers 201. The two anti-corrosion layers 201 can encapsulate the metal layer 211, preventing the metal layer 211 from contacting the heat exchange medium and corrosive substances in the environment, and improving the corrosion resistance of the flexible member 21.

[0286] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that, Comprising: A box body; At least two battery cells, located inside the box body; A heat exchange assembly, disposed on the top of the box body, the heat exchange assembly includes at least two heat exchange elements, at least one of the heat exchange elements is set as a flexible element, at least one of the heat exchange elements is set as a rigid element, the flexible element and the rigid element are stacked to form a medium flow channel, the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells; Wherein, at least part of the surface of at least one of the flexible element and the rigid element has an anti-corrosion layer.

2. The battery device according to claim 1, wherein, The box body includes an annular frame and a bottom guard plate, the annular frame has a top side opening and a bottom side opening, the rigid element closes the top side opening of the annular frame, and the bottom guard plate closes the bottom side opening of the annular frame.

3. The battery device according to claim 2, characterized in that, The top surface of the rigid element is covered with the anti-corrosion layer.

4. The battery device according to claim 1, wherein, At least part of the surface of the rigid element that constitutes the medium flow channel is covered with the anti-corrosion layer.

5. The battery device according to claim 4, characterized in that, All the surfaces of the rigid element facing the flexible element are covered with the anti-corrosion layer.

6. The battery device according to claim 1, characterized in that The anti-corrosion layer is hot-pressed onto the surface of the rigid element.

7. The battery device according to claim 1, wherein The anti-corrosion layer is made of one of polypropylene, polyethylene and polyamide.

8. The battery device according to any one of claims 1 to 7, characterized in that, The flexible element is a layered structure, the flexible element includes a metal layer and two anti-corrosion layers, and the metal layer is stacked between the two anti-corrosion layers.

9. The battery device according to any one of claims 1 to 7, characterized in that, The flexible element includes a metal-plastic film.

10. The battery device according to claim 9, characterized in that, The flexible element includes an aluminum-plastic film.

11. The battery device according to any one of claims 1 to 7, characterized in that, The flexible element is a layered structure, the flexible element includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

12. The battery device according to claim 11, characterized in that, The metal layer includes one of aluminum foil, copper foil and steel foil; and / or, The non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

13. The battery device according to claim 12, characterized in that, The non-metal layer is a heat-melt layer.

14. The battery device according to any one of claims 1 to 7, characterized in that, The thickness of the flexible element is 0.05 mm - 1 mm.

15. The battery device according to claim 14, characterized in that, The thickness of the flexible element is 0.08 mm - 0.2 mm.

16. The battery device according to any one of claims 1 to 7, characterized in that, The elastic modulus of the flexible element is 0.1 MPa - 10000 MPa.

17. The battery device according to any one of claims 1 to 7, characterized in that, The rigid element is set as a metal plate.

18. A heat exchange component, characterized in that, The heat exchange assembly includes at least two heat exchange elements, at least one of the heat exchange elements is set as a flexible element, at least one of the heat exchange elements is set as a rigid element, the flexible element and the rigid element are stacked to form a medium flow channel, the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells; Wherein, at least part of the surface of at least one of the flexible element and the rigid element has an anti-corrosion layer.

19. An electrical device, characterized in that, Including the battery device according to any one of claims 1 to 17 or the heat exchange assembly according to claim 18.

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