Battery device and electric equipment

Abstract

The invention relates to the technical field of batteries, and provides a battery device and electric equipment.The battery device comprises at least two battery monomers and a heat exchange assembly, the heat exchange assembly comprises at least two heat exchange pieces, at least one heat exchange piece is arranged to be a flexible piece, and at least one heat exchange piece is arranged to be a rigid piece; 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 battery monomers; the flexible part is of a layered structure and comprises a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially arranged in a stacked mode. Wherein one side, far away from the at least two battery monomers, of the heat exchange assembly is provided with a heat preservation part. The heat preservation part can better isolate the heat exchange assembly from the environment, the heat resistance of the heat exchange assembly is increased, and therefore heat exchange between the heat exchange assembly and the environment is reduced, heat diffusion of the heat exchange assembly to the environment is reduced, and the heat preservation performance of the heat exchange assembly is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery device 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 related technologies, taking a vehicle as an example, in a vehicle equipped with a battery device, the battery device can be used to provide power wholly or partially. During the use of the battery device, the temperature of battery cells in the battery device will rise, and it is necessary to control the temperature of the battery cells. Otherwise, it is likely to have an adverse impact on the performance and service life of the battery device. Therefore, how to reduce the heat diffusion of the heat exchange component to the environment 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 Invention

[0004] In view of this, embodiments of this application are expected to provide a battery device and an electrical equipment, in which a heat insulation member is arranged on a side of the heat exchange component away from the battery cells to reduce the heat diffusion of the heat exchange component to the environment.

[0005] To achieve the above object, the technical solution of the embodiments of this application is realized as follows: Embodiments of this application provide a battery device, including: At least two battery cells; A heat exchange component, the heat exchange component includes at least two heat exchange members, at least one of the heat exchange members is arranged as a flexible member, at least one of the heat exchange members is arranged 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 the at least two battery cells; the flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence; Wherein, a heat insulation member is arranged on a side of the heat exchange component away from the at least two battery cells.

[0006] 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 light weight, which is beneficial to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, 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. 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. One side of the heat exchange component facing the battery cell is used for heat exchange with the battery cell, and a heat preservation member is arranged on the side of the heat exchange component away from the battery cell. The heat preservation member can better isolate the heat exchange component and the environment, increase the thermal resistance of the heat exchange component, thereby reducing the heat exchange between the heat exchange component and the environment and reducing the heat diffusion of the heat exchange component to the environment, and improving the heat preservation performance of the heat exchange component. The flexible member formed by sequentially stacking a metal layer and a non-metal layer has a thin thickness and a small weight, and by forming a medium 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 component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0007] In some embodiments, the heat exchange component is arranged on the bottom side of the at least two battery cells, and the heat preservation member is attached to the bottom surface of the heat exchange component.

[0008] In this embodiment, since the heat preservation member is attached to the bottom surface of the heat exchange component, there is no gap between the heat preservation member and the heat exchange component. The heat exchange component can support the heat preservation member, and the assembly between the heat preservation member and the heat exchange component is stable and the process is simple, which is easy to manufacture.

[0009] In some embodiments, the heat exchange component is arranged on the bottom side of the at least two battery cells, and at least part of the heat preservation member is spaced from the bottom surface of the heat exchange component to form a heat insulation cavity.

[0010] In this embodiment, the heat insulation cavity can provide heat insulation function. When the flexible member is collided, the heat insulation cavity can absorb energy through deformation and play a role in buffering the impact.

[0011] In some embodiments, the heat insulation cavity is filled with air.

[0012] In this embodiment, the thermal conductivity of air is very low, and the air layer formed between the heat exchange component and the heat preservation member can better prevent the heat of the heat exchange component from dissipating to the environment, thereby improving the heat preservation performance of the heat exchange component.

[0013] In some embodiments, the rigid member is connected to the at least two battery cells, the flexible member is arranged on the bottom side of the rigid member, and the heat preservation member is arranged on the bottom side of the flexible member.

[0014] In this embodiment, the rigid member is connected to at least two battery cells. The rigid member has relatively higher strength and can bear the loads from the battery cells. Moreover, heat exchange can be achieved between the rigid member and the battery cells through heat conduction, which is beneficial to maintaining good heat exchange efficiency and regulating the temperature of the battery cells. The flexible member is connected to the bottom side of the rigid member and does not contact the battery cells, which can prevent the battery cells from squeezing the flexible member. A heat insulation member is provided on the bottom side of the flexible member, and the heat insulation member can isolate the flexible member from the environment to a certain extent and reduce the heat transfer between the flexible member and the environment.

[0015] In some embodiments, the heat insulation member is hot-pressed on the bottom side of the flexible member.

[0016] The heat insulation member is connected to the flexible member through a hot-pressing process. The hot-pressing process is a processing method that combines heating and pressing. It softens the heat insulation member and / or the flexible member through heat energy and shapes them through mechanical pressure, ultimately realizing the combination of the heat insulation member and the flexible member.

[0017] In some embodiments, the battery device includes a box body, the at least two battery cells are arranged in the box body, and the rigid member is configured as a part of the box body.

[0018] In this embodiment, the rigid member is configured as a part of the box body. That is to say, the rigid member is used both for laminating with the flexible member to form a medium flow channel and for constituting the box body. Such a design can reduce the number of components of the battery device and is beneficial to reducing the weight of the battery device.

[0019] In some embodiments, the box body includes a box main body, the rigid member includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, with a plane perpendicular to the top-bottom direction as the projection plane, the projection of the flexible member is located within the projection range of the main body area, the flexible member and the main body area define the medium flow channel, the avoidance area is connected to the box main body, the rigid member and the box main body jointly define a containing cavity, and the at least two battery cells are located in the containing cavity.

[0020] In this embodiment, the rigid member and the box main body jointly define a containing cavity, at least two battery cells are located in the containing cavity, the rigid member is a part of the side wall of the box body and plays a role in protecting the battery cells. The size of the flexible member is smaller than that of the rigid member, the flexible member is within the range of the main body area, and the flexible member hardly contacts the avoidance area, thereby reducing the influence on the flexible member during the assembly process of the avoidance area and the box main body.

[0021] In some embodiments, the at least two battery cells are connected to the rigid member.

[0022] In this embodiment, at least two battery cells are connected to a rigid member, and the rigid member supports the battery cells. The rigid member can maintain its shape more stably and can carry the battery cells more smoothly.

[0023] In some embodiments, the flexible member includes a metalized film.

[0024] In this embodiment, since the metalized film has a thin thickness and small weight, and by forming a dielectric flow channel between the metalized film 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 component can be reduced. At the same time, since the metalized 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 and the internally flowing heat exchange medium can also be reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0025] In some embodiments, the flexible member includes an aluminum-plastic film.

[0026] In this embodiment, the flexible member uses an aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability resistance, and electrical insulation, meeting the insulation and anti-corrosion requirements.

[0027] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil; and / or, the non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0028] In this embodiment, by setting the metal layer as one or more 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 or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member can have certain waterproof properties and / or corrosion resistance to the heat exchange medium.

[0029] In some embodiments, the non-metal layer is a hot melt layer.

[0030] 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 composite together through hot melting, with simple molding and high production efficiency.

[0031] In some embodiments, the thickness of the flexible member is 0.05 mm - 0.3 mm.

[0032] In this embodiment, by setting the thickness of the flexible member to 0.05 mm - 0.3 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 relatively small, which is beneficial to reducing the overall volume and weight of the battery device, so as to increase the energy density of the battery device.

[0033] In some embodiments, the thickness of the flexible member is 0.08 mm - 0.2 mm.

[0034] 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, further the overall thickness of the heat exchange assembly is relatively small, which is beneficial to further reducing the overall volume and weight of the battery device, so as to further increase the energy density of the battery device.

[0035] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa - 10,000 MPa.

[0036] In this embodiment, by setting the elastic modulus of the flexible member to 0.1 MPa - 10,000 MPa, on one hand, the flexible member has a certain structural strength, improving the reliability of the heat exchange assembly, and on the other hand, it has a certain deformation ability, which can improve 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.

[0037] In some embodiments, the rigid member is set as a metal plate.

[0038] In this embodiment, by setting the rigid member 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, the rigid member can also play a certain supporting role for the flexible member.

[0039] The embodiment of the present application provides an electrical equipment, including the battery device described in any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of a vehicle in some embodiments of the present application; Figure 2 It is an exploded schematic diagram of a battery device in some embodiments of the present application; Figure 3 is Figure 2 an exploded schematic diagram of the heat exchange assembly in Figure 4 is Figure 3 an assembly schematic diagram of the heat exchange assembly in Figure 5Explosion schematic diagram of the flexible part and the heat insulation part in some embodiments of the present application; Figure 6 Explosion schematic diagram of the flexible part and the heat insulation part in other embodiments of the present application; Figure 7 is Figure 6 Assembly schematic diagram of the flexible part and the heat insulation part in Figure 8 is Figure 7 Cross-sectional schematic diagram in the A-A direction in

[0041] Explanation of reference numerals 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 21, flexible part; 22, rigid part; 221, avoidance area; 222, main body area; 23, connecting piece; 210, heat insulation part; 210a, heat insulation cavity; 3, box body; 31, annular frame; 32, top cover; 33, bottom guard plate. Detailed implementation manners

[0042] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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.

[0044] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present 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.

[0045] It should be noted that in the present application, at least two includes two and more than two. A plurality includes two and more than two.

[0046] Please refer to Figures 1 to 3 , for the convenience of understanding the battery device 100 and the electrical equipment provided by the embodiments of the present application, first introduce some basic structures of the battery cell 1, the battery device 100 and the electrical equipment provided by the embodiments of the present application.

[0047] In the embodiments of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so that the active material can be reused.

[0048] The battery cell 1 may 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.

[0049] The battery cell 1 generally includes an electrode assembly, which 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 short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0050] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0051] 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.

[0052] As an example, the positive electrode current collector may 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 may 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.).

[0053] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphate may include but not limited to lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0054] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0055] As an example, the negative electrode current collector may be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, or metals 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 may include a polymer material substrate 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 substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0056] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0057] 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 disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0058] As an example, the negative electrode active material may be a 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 may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials may 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.

[0059] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0060] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of the separator film, and any known porous structure separator film with good chemical stability and mechanical stability can be selected.

[0061] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or 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.

[0062] 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.

[0063] In some embodiments, the battery cell 1 further includes an electrolyte, which 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-like, or solid.

[0064] Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0065] 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 difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0066] 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.

[0067] In some embodiments, the electrolyte can also optionally include additives. For example, the additives can include negative electrode film-forming additives, can also include positive electrode film-forming additives, and can also include additives that can improve certain properties of the battery cell 1, such as additives for improving the overcharge / fast 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.

[0068] Among them, the gel electrolyte includes a polymer as a framework network and can be used in combination with an ionic liquid-lithium salt.

[0069] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0070] As an example, the polymer of the polymer solid electrolyte may include polyethers (polyethylene oxide), polysiloxanes, polycarbonates, polyacrylonitriles, polyvinylidene fluorides, polymethyl methacrylates, single-ion polymers, polyionic liquids, celluloses, etc.

[0071] As an example, the inorganic solid electrolyte can be one or more of oxide solid electrolytes (crystalline perovskites, sodium superionic conductors, garnets, amorphous LiPON films), sulfide solid electrolytes (crystalline lithium superionic conductors (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfides), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0072] The electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0073] In some embodiments, the electrode assembly is in a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0074] In some embodiments, the electrode assembly is in a stacked structure.

[0075] 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.

[0076] 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.

[0077] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0078] As an example, multiple separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0079] As an example, the separators can be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0080] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or prismatic, etc.

[0081] In some embodiments, the electrode assembly is provided with electrode tabs, and the electrode tabs can conduct current out of the electrode assembly. The electrode tabs include a positive electrode tab and a negative electrode tab.

[0082] In some embodiments, the battery cell 1 may include a housing. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealed bag is further included between the housing and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may 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.

[0083] As an example, the battery cell 1 may be a cylindrical battery cell, a prismatic battery cell, a pouch 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, and the multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc., and there is no particular limitation in this application.

[0084] 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 may be provided with one or more openings. One or more end caps may also be provided.

[0085] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal may be provided on the end cap or on the housing body.

[0086] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to discharge the internal gas of the battery cell 1.

[0087] 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 of the materials of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell 1.

[0088] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0089] As an example, the pressure relief mechanism may also be separately provided and connected to the housing.

[0090] As used in this application, "actuation" refers to the movement or activation of the pressure relief mechanism 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 may include, but are not limited to: the components in the pressure relief mechanism move to form an exhaust passage, at least a part of the pressure relief mechanism breaks, shatters, is 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, thus avoiding potential more serious accidents.

[0091] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the gas inside the battery cell 1.

[0092] 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 separators, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0093] The battery device 100 provided by the embodiments of this application includes the battery cell 1 in any one of the embodiments of this application.

[0094] 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.

[0095] 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.

[0096] 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, and then the modules are connected in series, parallel or in a hybrid connection to form a whole.

[0097] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells 1.

[0098] As an example, the battery cell assembly can be a battery module (Battery Module), and the battery module 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.

[0099] In some embodiments, the battery device 100 may be a battery pack.

[0100] Please refer to Figure 2 , the battery device 100 may include a box body 3. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 3 by fixing the battery module to the box body 3.

[0101] As an example, the battery cell assembly may also be accommodated in the box body 3 by directly fixing a plurality of battery cells 1 to the box body 3.

[0102] In some embodiments, the box body 3 may be part of the chassis structure of a vehicle. For example, a part of the box body 3 may form at least a part of the floor of the vehicle, or a part of the box body 3 may form at least a part of the cross beam and longitudinal beam of the vehicle.

[0103] The embodiments of the present application provide an electrical device, and the electrical device includes the battery device 100 in any one of the embodiments of the present application. The battery device 100 is used to store or provide electrical energy.

[0104] The electrical device includes but is not limited to energy storage devices, mobile phones, tablets, laptop computers, electric toys, electric tools, vehicles, ships, or spacecraft, etc. Among them, the vehicle may include battery-powered vehicles and electric vehicles, and the electric toys may 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 aircraft toys, etc., and the spacecraft may include airplanes, rockets, space shuttles, and spaceships, etc.

[0105] The energy storage device includes but is not limited to energy storage containers or energy storage cabinets, etc.

[0106] 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.

[0107] Figure 1 It is a schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. As Figure 1As shown, a battery device 100 is provided inside the vehicle 1000. 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 supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start-up, navigation, and driving of the vehicle 1000.

[0108] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0109] In the related art, 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. A heat exchange component is used to exchange heat with the battery cells to adjust the temperature of the battery cells. For example, when the battery cells are working and heating up, the heat exchange component absorbs the heat of the battery cells to dissipate heat and cool down the battery cells. When the external ambient temperature is relatively low and it is necessary to heat up the battery cells, the heat exchange component releases heat to the battery cells. The heat exchange component usually adopts hard aluminum plates stacked to form a flow channel. The thermal conductivity of the aluminum plate itself is relatively large. Under low-temperature working conditions, that is, when the ambient temperature is relatively low, the heat of the heat exchange component is easily dissipated into the environment, resulting in low heat exchange efficiency between the battery cells and the heat exchange component.

[0110] In view of this, an embodiment of the present application provides a battery device, which includes at least two battery cells and a heat exchange component. The heat exchange component includes at least two heat exchange elements. At least one heat exchange element is set as a flexible element, and at least one heat exchange element is set 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. The heat exchange medium is used to exchange heat with at least two battery cells; the flexible element is a layered structure and includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Wherein, a heat insulation member is provided on a side of the heat exchange component away from the at least two battery cells.

[0111] The battery device provided in the embodiment of the present application, the battery device provided in 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 part and a rigid part, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device, the flexible part and the rigid part are stacked to form at least one medium flow channel, the rigid part can play a supporting role for the flexible part, which is conducive to improving the overall structural strength and stability of the heat exchange component, and improving the applicability of the heat exchange component. The side of the heat exchange component facing the battery cell is used for heat exchange with the battery cell, and the side of the heat exchange component away from the battery cell is provided with a heat preservation part, which can better isolate the heat exchange component from the environment, increase the thermal resistance of the heat exchange component, thereby reducing the heat exchange between the heat exchange component and the environment, reducing the heat diffusion of the heat exchange component to the environment, and improving the heat preservation performance of the heat exchange component. The thickness of the flexible part stacked in sequence by the metal layer and the non-metal layer is thin and the weight is small, and by forming a medium flow channel between the flexible part and the rigid part, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the thickness and weight of the heat exchange component as a whole can be reduced. In addition, the heat exchange components will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0112] The battery device 100 provided in the embodiment of the present application is further described below in conjunction with the accompanying drawings. Figures 2 to 8 The battery device 100 provided in the embodiment of the present application includes at least two battery cells 1 and a heat exchange component 2.

[0113] The heat exchange assembly 2 includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part 21, and at least one heat exchange part is set as a rigid part 22. The flexible part 21 and the rigid part 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 to exchange heat with at least two battery cells 1. The flexible part 21 is a layered structure, and the flexible part 21 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Among them, a heat preservation part 210 is provided on the side of the heat exchange assembly 2 away from the at least two battery cells 1.

[0114] The flexibility in the flexible part 21 refers to the material properties of the structure. This type of property can be a property given to the material due to its light weight, or a property given to the material due to at least one of the material's thickness, stiffness, strength, elastic modulus, elongation at break, etc. As an example, the material of the flexible part 21 can be selected to be a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible part 21. The embodiment of the present application helps to reduce the weight of the heat exchange component 2 by configuring the heat exchange component 2 to include the flexible part 21.

[0115] The rigidity in the rigid member 22 refers to the material property of the structure. Such a type of property can be the property bestowed upon the material due to its relatively heavy mass, or it can be the property bestowed upon the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, elongation at break, 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, or materials of structures such as composite 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] It should be noted that the specific type of the heat exchange medium is not limited here, 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 for description.

[0120] It should be noted that the specific number of the medium flow channels 2a is not limited here. It can be one or multiple.

[0121] 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.

[0122] 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, the flexible members 21 can be the same or different.

[0123] The fact that at least one heat exchange member is provided as the rigid member 22 means that the number of the rigid members 22 is one or more. In embodiments where multiple heat exchange members are provided as the rigid members 22, the rigid members 22 may be the same or different.

[0124] Exemplarily, the heat exchange assembly 2 includes two heat exchange members, one of which is the flexible member 21 and the other is the rigid member 22.

[0125] 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.

[0126] As an example, the heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1.

[0127] The heat exchange assembly 2 being disposed on the bottom side X2 of at least two battery cells 1 means that the heat exchange assembly 2 is located on the side of at least two battery cells 1 close to the ground.

[0128] It should be noted that the top side X1 and the bottom side X2 are two opposite sides in the top-bottom direction X. Generally, the bottom side X2 faces the ground and the top side X1 faces the sky.

[0129] A heat preservation member 210 is provided on the side of the heat exchange assembly 2 away from at least two battery cells 1. Exemplarily, the heat preservation member 210 is provided on the bottom side X2 of the heat exchange assembly 2.

[0130] The heat preservation member 210 is a structure that provides heat preservation and insulation functions and reduces heat transfer.

[0131] The heat preservation member 210 has a small thermal conductivity. Exemplarily, the thermal conductivity of the heat preservation member 210 is not greater than 0.23 W / (m·K), and preferably, the thermal conductivity of the heat preservation member 210 is not greater than 0.05 W / (m·K).

[0132] It should be noted that the unit "W / (m·K)" is watt per (meter·Kelvin).

[0133] The layered structure refers to a structure that spreads in a single layer or multiple layers in a planar or curved surface form, and the multiple layers can be parallel to each other or regularly stacked.

[0134] Here, the flexible member 21 includes a metal layer and a non-metal layer, that is, a composite member composed of the metal layer and the non-metal layer.

[0135] Exemplarily, the metal layer and the non-metal layer can be formed by hot pressing or hot melting.

[0136] Here, the numbers of the metal layer and the non-metal layer are not limited.

[0137] 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 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. One side of the heat exchange component 2 facing the battery cell 1 is used to exchange heat with the battery cell 1. A heat insulation member 210 is provided on the side of the heat exchange component 2 away from the battery cell 1. The heat insulation member 210 can better isolate the heat exchange component 2 and the environment, increase the thermal resistance of the heat exchange component 2, thereby reducing the heat exchange between the heat exchange component 2 and the environment and reducing the heat diffusion of the heat exchange component 2 to the environment, and improving the heat insulation performance of the heat exchange component 2. The flexible member 21 formed by sequentially laminating a metal layer and a non-metal layer has a thin thickness and a small weight, and by forming a medium 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.

[0138] The material of the heat insulation member 210 is not limited. Exemplarily, the heat insulation member 210 includes but is not limited to polyimide and / or flame-retardant foam, etc.

[0139] In some embodiments, the heat insulation member 210 can cover all or part of the surface of the heat exchange component 2 away from the battery cell 1. For example, the heat insulation member 210 can cover all or part of the surface of the flexible member 21 away from the battery cell 1.

[0140] In some embodiments, please refer to Figure 5 , the heat exchange component 2 is disposed on the bottom side X2 of at least two battery cells 1, and the heat insulation member 210 is attached to the bottom surface of the heat exchange component 2.

[0141] As an example, the surface morphology of the heat insulation member 210 can be the same as the bottom surface morphology of the heat exchange component 2. For example, if the bottom surface of the heat exchange component 2 is flat, the surface of the heat insulation member 210 can also be flat. Another example is that if the bottom surface of the heat exchange component 2 is an uneven curved surface, the surface of the heat insulation member 210 can also be an uneven curved surface.

[0142] In this embodiment, since the heat insulation member 210 is attached to the bottom surface of the heat exchange component 2, there is no gap between the heat insulation member 210 and the heat exchange component 2. The heat exchange component 2 can support the heat insulation member 210. The heat insulation member 210 and the heat exchange component 2 are firmly assembled and the process is simple, which is easy to manufacture.

[0143] In some embodiments, please refer to Figures 6 to 8 , the heat exchange component 2 is disposed on the bottom side X2 of at least two battery cells 1, and at least a part of the heat insulation member 210 is spaced apart from the bottom surface of the heat exchange component 2 to form a heat insulation cavity 210a.

[0144] A heat insulation cavity 210a is formed between the heat insulation member 210 and the bottom surface of the heat exchange component 2. In other words, at least a part of the heat insulation member 210 constitutes the side wall of the heat insulation cavity 210a, and the bottom surface of the heat exchange component 2 also constitutes the side wall of the heat insulation cavity 210a.

[0145] It should be noted that the specific number of the heat insulation cavities 210a is not limited herein. It can be one or multiple.

[0146] In this embodiment, the heat insulation cavity 210a can provide heat insulation function. When the flexible member 21 is collided, the heat insulation cavity 210a can absorb energy through deformation and play a role in buffering the impact.

[0147] In some embodiments, the heat insulation cavity 210a is filled with air.

[0148] The heat insulation cavity 210a can be a sealed chamber. In other embodiments, the heat insulation cavity 210a can also be filled with other poor heat conductors, such as gases or liquids with low thermal conductivity, etc.

[0149] In this embodiment, the thermal conductivity of air is very low, and the air layer formed between the heat exchange component 2 and the heat insulation member 210 can better prevent the heat of the heat exchange component 2 from dissipating to the environment, thereby improving the heat preservation performance of the heat exchange component 2.

[0150] The connection manner between the heat insulation member 210 and the heat exchange component 2 is not limited. When the heat insulation member 210 is an independently manufactured film layer, the heat insulation member 210 can be bonded or hot-pressed to the surface of the heat exchange component 2. The heat insulation member 210 can also be a coating and be attached to the surface of the heat exchange component 2 by means of intermolecular force, etc.

[0151] In some embodiments, please refer to Figures 2 to 5 , the rigid member 22 is connected to at least two battery cells 1, the flexible member 21 is disposed on the bottom side X2 of the rigid member 22, and the heat insulation member 210 is disposed on the bottom side X2 of the flexible member 21.

[0152] In this embodiment, the rigid member 22 is connected to at least two battery cells 1. The rigid member 22 has relatively higher strength and can bear the load from the battery cells 1. Moreover, heat exchange can be achieved between the rigid member 22 and the battery cells 1 through heat conduction, which is beneficial to maintaining good heat exchange efficiency and regulating the temperature of the battery cells 1. The flexible member 21 is connected to the bottom side X2 of the rigid member 22. The flexible member 21 is not in contact with the battery cells 1, which can prevent the battery cells 1 from squeezing the flexible member 21. A heat insulation member 210 is provided on the bottom side X2 of the flexible member 21. The heat insulation member 210 can isolate the flexible member 21 from the environment to a certain extent and reduce the heat transfer between the flexible member 21 and the environment.

[0153] In some embodiments, the heat insulation member 210 is thermally pressed on the bottom side X2 of the flexible member 21.

[0154] The heat insulation member 210 is connected to the flexible member 21 through a hot pressing process. The hot pressing process is a processing method that combines heating and pressing. It softens the heat insulation member 210 and / or the flexible member 21 through heat energy and shapes them through mechanical pressure, ultimately realizing the combination of the heat insulation member 210 and the flexible member 21.

[0155] In this embodiment, the heat insulation member 210 is connected to the flexible member 21 through a hot pressing process, which can adapt to the situation where the flexible member 21 and / or the heat insulation member 210 have complex shapes and is beneficial to shortening the production cycle.

[0156] In some embodiments, please refer to Figures 2 to 4 , the battery device 100 includes a box body 3. At least two battery cells 1 are arranged in the box body 3, and the rigid member 22 is configured as a part of the box body 3.

[0157] The box body 3 can be used to hold the battery cells 1 and other structural members, provide protection for the battery cells 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 cells 1.

[0158] The heat exchange assembly 2 is connected to the box body 3 or the heat exchange assembly 2 can be a part of the structure of the box body 3. In this way, the box body 3 can provide support for the heat exchange assembly 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0159] As an example, the heat exchange assembly 2 and the box body 3 can be connected by non-detachable connection or detachable connection and other methods.

[0160] Unless otherwise specified, in this 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.

[0161] As an example, the heat exchange component 2 is part of the structure of the box body 3, which means that the heat exchange component 2 forms part of the side walls of the box body 3. For example, the rigid member 22 can form the bottom wall and / or the peripheral side walls of the box body 3, etc.

[0162] In this embodiment, the rigid member 22 is configured as part of the box body 3. That is to say, the rigid member 22 is used both for laminating with the flexible member 21 to form the medium flow channel 2a and for constituting the box body 3. Such a design can reduce the number of components of the battery device 100 and is beneficial to reducing the weight of the battery device 100.

[0163] 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 single hexahedron, a cylinder, or a sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a hexahedron, a cylinder, or a 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.

[0164] 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 plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0165] 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 a liquid storage device such as an air conditioning system or a water tank of a whole vehicle or an electric device.

[0166] Exemplarily, please refer to Figure 3 , 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.

[0167] The material of the connector 23 includes but is not limited to metal or plastic, etc.

[0168] Exemplarily, the connector 23 is brazed to the rigid member 22.

[0169] Exemplarily, the connector 23 is, for example, a water nozzle.

[0170] 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.

[0171] Here, the heat exchange component 2 can exchange heat with the battery cell 1 by dissipating heat from the battery cell 1 or heating the battery cell 1.

[0172] The principle of the heat exchange component 2 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 and releases the heat, completing the cooling and heat dissipation of the battery cell 1.

[0173] The principle of the heat exchange component 2 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 realize heating of 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.

[0174] In some embodiments, the elongation at break of the flexible member 21 is greater than that of the rigid member 22.

[0175] 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 stretched under force.

[0176] The elongation at break of the flexible member 21 is greater than that of the rigid member 22. In other words, when stretched under force, 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.

[0177] 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.

[0178] In some embodiments, the elongation at break of the flexible member 21 is in the range of 30% to 300%.

[0179] 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.

[0180] In this embodiment, by setting the elongation at break of the flexible member 21 to be in the range of 30% to 300%, the flexible member 21 can have a certain impact resistance and puncture resistance while also having a certain structural strength.

[0181] In some embodiments, the fracture elongation rate of the rigid member 22 ranges from 1% to 50%.

[0182] The fracture elongation rate 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.

[0183] In this embodiment, by setting the fracture elongation rate of the rigid member 22 to range from 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.

[0184] In some embodiments, the elastic modulus of at least a part of the flexible member 21 is less than the elastic modulus of the rigid member 22.

[0185] Here, it can be that the elastic modulus of a part of the flexible member 21 is less than the elastic modulus of the rigid member 22, or the elastic modulus of all regions of the flexible member 21 is less than the elastic modulus of the rigid member 22.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] In some embodiments, please refer to Figure 2 and Figure 3 , the rigid member 22 is integrated into the box body 3, the flexible member 21 is connected to the bottom side X2 of the rigid member 22, and at least two battery cells 1 are connected to the rigid member 22.

[0191] The integration of the rigid member 22 into the box body 3 means that the rigid member 22 is connected to the box body 3 or the rigid member 22 forms part of the side wall of the box body 3.

[0192] If the flexible member 21 is connected to the bottom side X2 of the rigid member 22, then the flexible member 21 is located on the side of the rigid member 22 away from the battery cell 1.

[0193] At least two battery cells 1 are connected to the rigid member 22. It can be two, three or more battery cells 1 connected to the rigid member 22. Exemplarily, all battery cells 1 are connected to the rigid member 22.

[0194] The manner of connecting the battery cell 1 to the rigid member 22 is not limited. The battery cell 1 can be connected to the rigid member 22 through a heat-conducting structure.

[0195] The heat-conducting structure refers to a structure made of a good conductor of heat. Exemplarily, the heat-conducting coefficient of the heat-conducting structure is not less than 30 W / (m·K). The heat-conducting structure has good heat-conducting performance and connection function. The heat-conducting structure can establish a heat conduction path between the rigid member 22 and the battery cell 1 to improve the heat exchange efficiency.

[0196] The specific material of the heat-conducting structure is not limited. Exemplarily, the heat-conducting structure includes but is not limited to heat-conducting structural adhesives, etc.

[0197] In this embodiment, at least two battery cells 1 are connected to the rigid member 22. The rigid member 22 can support the battery cells 1 more stably. The flexible member 21 is connected to the bottom side X2 of the rigid member 22, which reduces the risk of the battery cells 1 contacting and squeezing the flexible member 21 to a certain extent. The rigid member 22 has good structural strength and can withstand a relatively large assembly force and maintain its shape unchanged. Integrating the rigid member 22 into the box body 3 enables the heat exchange assembly 2 to be stably assembled to the box body 3 with little damage.

[0198] In some embodiments, the rigid member 22 can be a flat plate structure with planes on both sides in the thickness direction.

[0199] In this embodiment, the structure of the rigid member 22 is simple and easy to manufacture and form. For example, the rigid member 22 can be formed by processes such as extrusion.

[0200] In some embodiments, please refer to Figures 2 to 4 , the box body 3 includes a box main body. The rigid member 22 includes an avoidance area 221 and a main body area 222. The avoidance area 221 surrounds the outer periphery of the main body area 222. Taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible member 21 is within the projection range of the main body area 222. The flexible member 21 and the main body area 222 define a medium flow channel 2a. The avoidance area 221 is connected to the box main body. The rigid member 22 and the box main body jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity.

[0201] The avoidance area 221 surrounds the outer periphery of the main body area 222. The avoidance area 221 can be generally annular, and the avoidance area 221 surrounds the main body area 222.

[0202] Taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible member 21 is within the projection range of the main body area 222. That is to say, the projection of the flexible member 21 does not overlap with the projection of the avoidance area 221. In other words, the projection of the avoidance area 221 surrounds the projection of the flexible member 21.

[0203] In this embodiment, the rigid member 22 and the box main body jointly define an accommodation cavity. At least two battery cells 1 are located in the accommodation cavity. The rigid member 22 is part of the side wall of the box body 3, which plays a role in protecting the battery cells 1. The size of the flexible member 21 is smaller than the size of the rigid member 22. The flexible member 21 is within the range of the main body area 222, and the flexible member 21 is basically not in contact with the avoidance area 221, thereby reducing the influence on the flexible member 21 during the assembly of the avoidance area 221 and the box main body.

[0204] In some embodiments, the rigid member 22 can be a flat plate structure with planes on both sides along the thickness direction. The avoidance area 221 and the main body area 222 can be virtually divided from the rigid member 22 by the dashed line L or the solid line.

[0205] In some cases, the box body 3 and the heat exchange component 2 are connected by welding. Taking friction stir welding as an example, the temperature of friction stir welding is relatively high, which may be much higher than the melting point of the flexible member 21. For example, the melting point of the flexible member 21 may be between 140 °C and 180 °C, which may cause the high temperature formed by welding to melt the flexible member 21.

[0206] In some embodiments, the avoidance area 221 is welded to the box main body.

[0207] As an example, the avoidance area 221 and the box main body can be welded by friction stir welding (i.e., FSW, Friction Stir Welding).

[0208] In one example, the width dimension of the avoidance area 221 is between 5 mm and 15 mm, and the dimension of the welding area can be between 3 mm and 8 mm.

[0209] In this embodiment, the avoidance area 221 is welded to the box main body. Since the projection of the flexible member 21 is within the projection range of the main body area 222, during the welding process of the avoidance area 221 and the box main body, the distance between the welding position and the flexible member 21 is greater than zero, and the welding high temperature will not directly act on the flexible member 21, thereby reducing the risk of local melting of the flexible member 21 during the welding process.

[0210] It should be noted that the unit "°C" is Celsius.

[0211] In some cases, the box body is connected to the heat exchange component 2 by screws, and the high temperature caused by the high-speed rotation of the screws may also melt the flexible part 21.

[0212] In some embodiments, the avoidance area 221 and the box body are connected by fasteners.

[0213] The fasteners include but are not limited to screws or bolts, etc.

[0214] In one example, the width dimension of the avoidance area 221 is between 5 mm and 10 mm.

[0215] As an example, the avoidance area 221 and the box body can be connected by fasteners using the Flow Drill Screw (FDS) process.

[0216] In this embodiment, since the projection of the flexible part 21 is within the projection range of the main body area 222, during the fastening assembly of the avoidance area 221 and the box body, the distance between the fastener and the flexible part 21 is greater than zero, and the high temperature generated during the high-speed rotation of the fastener will not directly act on the flexible part 21, thereby reducing the risk of local melting of the flexible part 21 during the connection by fasteners.

[0217] In some embodiments, the width dimension of the avoidance area 221 is between 5 mm and 15 mm. Preferably, the width dimension of the avoidance area 221 is between 10 mm and 15 mm.

[0218] Exemplarily, the width dimension of the avoidance area 221 is a point value of any one of 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 11 mm, 12 mm, 14 mm, and 15 mm or a point value between any two of them.

[0219] The width dimension of the avoidance area 221 refers to the distance between the boundary line between the avoidance area 221 and the main body area 222 and the edge line of the avoidance area 221.

[0220] In this embodiment, the width dimension of the avoidance area 221 is appropriate. There is sufficient space for connecting to the box body 3 to avoid the flexible part 21, and it can also avoid occupying the area of the main body area 222 as much as possible. The main body area 222 retains enough area to form the medium flow channel 2a, taking into account the heat exchange requirements.

[0221] It should be noted that the unit "mm" is millimeter.

[0222] In some embodiments, please refer to Figures 2 to 4 , at least two battery cells 1 are connected to the rigid part 22.

[0223] In this embodiment, at least two battery cells 1 are connected to the rigid member 22, and the rigid member 22 supports the battery cells 1. The rigid member 22 can maintain its shape more stably and can carry the battery cells 1 more smoothly.

[0224] In some embodiments, referring to Figure 2 and Figure 3 , the box body 3 includes a box main body and a bottom guard plate 33. The box main body includes an annular frame 31 and a top cover 32. The annular frame 31 has a top-side opening and a bottom-side opening. The rigid member 22 is connected to the annular frame 31 and closes the bottom-side opening; the top cover 32 closes the top-side opening of the annular frame 31; the top cover 32, the annular frame 31, and the rigid member 22 together define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity; the bottom guard plate 33 is located on the bottom side of the flexible member 21, and the bottom guard plate 33 is connected to the annular frame 31.

[0225] As an example, the rigid member 22 can be welded to the annular frame 31 or connected by fasteners.

[0226] The annular frame 31 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 31 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 31.

[0227] The receiving cavity can be a sealed space or a non-sealed space.

[0228] The top cover 32 can be welded to the annular frame 31 or connected by fasteners.

[0229] The bottom guard plate 33 can be welded to the annular frame 31 or connected by fasteners.

[0230] In this embodiment, the annular frame 31 and the top cover 32 can be manufactured separately and then assembled into the box main body. The rigid member 22 and the box main body together define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity. The rigid member 22 is a partial side wall of the box body 3 and functions to protect the battery cells 1. The bottom guard plate 33 is located on the bottom side of the flexible member 21, and the bottom guard plate 33 can protect the flexible member 21 and prevent objects outside the box body 3 from contacting the flexible member 21.

[0231] In some embodiments, the box body 3 includes a box main body. The box main body opens toward the bottom side, and the heat exchange assembly 2 closes the bottom-side opening of the box main body to jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity.

[0232] As an example, a bottom guard plate 33 can be provided on the bottom side X2 of the heat exchange assembly 2, and the bottom guard plate 33 is connected to the box main body. In this way, the bottom guard plate 33 can protect the flexible member 21.

[0233] In this embodiment, the heat exchange component 2 closes the opening on the bottom side of the box body. The rigid member 22 serves as the bottom wall of the box body 3, which can reduce the overall weight of the battery device 100.

[0234] 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. The flexible member 21 and the rigid member 22 are connected to each other in at least part of the hot-pressed area.

[0235] 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.

[0236] 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 guaranteed, and it is not easy to crack.

[0237] In this embodiment, the flexible member 21 is sealed by a hot-pressing process, that is, a hot-pressed area is formed by hot pressing. The hot-pressed area divides the heat exchange component 2 to form at least one medium flow channel 2a. This forming method is simple.

[0238] Exemplarily, the hot-pressed area includes a heat-sealed area and a non-heat-sealed area. The non-heat-sealed area and the medium flow channel 2a are respectively located on both sides of the heat-sealed area, which is beneficial to reducing the width of the heat-sealed area and improving the problem of excessive temperature caused by the too wide heat-sealed area, affecting the hot-pressing quality and damaging the flexible member 21. In addition, the non-heat-sealed area can also form a buffer area for stress release when the flexible member 21 is folded, improving the situation where stress concentration occurs in the heat-sealed area and causing damage to the heat-sealed area.

[0239] In the related art, the heat exchange component is formed by welding two pieces of high-strength aluminum alloy. For high-strength aluminum alloy (such as 5 series, 6 series, etc.), due to the relatively high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0240] In the embodiment of the present application, by setting the heat exchange component 2 to include the flexible member 21 and the rigid member 22, the flexible member 21 and the rigid member 22 are hot-pressed to form a hot-pressed area and a medium flow channel 2a. 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.

[0241] In some embodiments, the flexible member 21 is in the form of a single-layer or multi-layer thin film.

[0242] In some embodiments, the flexible member 21 includes a metalized film.

[0243] Here, the metalized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0244] In this embodiment, since the metalized plastic film is thin and light in weight, and a dielectric flow channel 2a is formed between the metalized plastic film and the rigid member 22, 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 2 can be reduced. At the same time, since the metalized plastic film has the characteristics of insulation and corrosion prevention 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 internally flowing heat exchange medium is also reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0245] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0246] In this embodiment, the flexible member 21 uses an aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the insulation and anti-corrosion requirements.

[0247] In some embodiments, the flexible member 21 is a layered structure. The flexible member 21 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Among them, the non-metal layer is disposed on the side of the metal layer facing the rigid member 22.

[0248] That is to say, the non-metal layer is located between the metal layer and the rigid member 22.

[0249] Here, by disposing the non-metal layer on the side of the metal layer facing the rigid member 22, the non-metal layer can be thermally pressed and connected to the rigid member 22.

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

[0251] In this embodiment, by setting the metal layer as one or more of aluminum foil, copper foil, and steel foil, the flexible member 21 can have a certain structural strength and can play an isolation role.

[0252] In some embodiments, the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0253] In this embodiment, by setting the non-metal layer as one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member 21 can have a certain waterproof effect and / or the performance of resisting corrosion by the heat exchange medium.

[0254] 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.

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

[0256] In this embodiment, by setting the non-metal layer as a hot-melt layer, which is composed of a hot-melt material, it is beneficial to make the non-metal layer and the metal layer composite together through hot melting, with simple molding and high production efficiency.

[0257] In some embodiments, the thickness of the flexible member 21 is 0.05 mm - 0.3 mm.

[0258] Exemplarily, the thickness of the flexible member 21 is a point value of any one of 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 or a point value between any two of them.

[0259] In this embodiment, by setting the thickness of the flexible member 21 to 0.05 mm - 0.3 mm, while the heat exchange component 2 made of the flexible member 21 has a certain structural strength, the overall thickness of the heat exchange component 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.

[0260] In some embodiments, the thickness of the flexible member 21 is 0.08 mm - 0.2 mm.

[0261] Exemplarily, the thickness of the flexible member 21 is a point value of any one of 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 a point value between any two of them.

[0262] In this embodiment, by setting the thickness of the flexible member 21 to 0.08 mm - 0.2 mm, while the heat exchange component 2 made of the flexible member 21 has a certain structural strength, further, the overall thickness of the heat exchange component 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.

[0263] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa - 10000 MPa.

[0264] Exemplarily, the elastic modulus of the flexible member 21 may be a point value of any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, 10000 MPa or a point value between any two of them.

[0265] In this embodiment, by setting the elastic modulus of the flexible member 21 to be 0.1 MPa - 10000 MPa, not only can the flexible member 21 have a certain structural strength to improve 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.

[0266] In some embodiments, the rigid member 22 is provided as a metal plate.

[0267] Exemplarily, for example, it may be an aluminum alloy.

[0268] 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.

[0269] 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.

[0270] The plurality of sub - flow channels are communicated to form the medium flow channel 2a.

[0271] The extending direction of the sub - flow channels is perpendicular to the length direction of the battery cell 1. That is to say, the plurality of sub - flow channels are arranged along the length direction of the battery cell 1. In this way, the length direction of the battery cell 1 can correspond to a plurality of sub - flow channels.

[0272] It can be understood that along the flow direction of the heat exchange medium, the temperature of the heat exchange medium will gradually increase. Therefore, by corresponding each battery cell 1 to a plurality of sub-channels, it is beneficial to improve the temperature uniformity of the battery cell 1.

[0273] 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 5 The battery device 100 provided by the embodiments of the present application includes at least two battery cells 1 and a heat exchange assembly 2. The heat exchange assembly 2 is disposed on the bottom side X2 of the at least two battery cells 1. The heat exchange assembly 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 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 to exchange heat with the at least two battery cells 1; the rigid member 22 is connected to the at least two battery cells 1, the flexible member 21 is disposed on the bottom side X2 of the rigid member 22, and a heat insulation member 210 is disposed on the bottom side X2 of the flexible member 21. The heat insulation member 210 can be attached to the bottom surface of the flexible member 21.

[0274] In this embodiment, the heat exchange assembly 2 is used to exchange heat with the battery cell 1. By setting the heat exchange assembly 2 to include the flexible member 21 and the rigid member 22, the mass of the flexible member 21 is relatively light, which is beneficial to reducing the mass of the heat exchange assembly 2, reducing the production cost of the heat exchange assembly 2, and is also beneficial to reducing the mass of the battery device 100. The rigid member 22 can improve the structural strength of the heat exchange assembly 2, so as to facilitate the heat exchange assembly 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 assembly 2, and improving the applicability of the heat exchange assembly 2. One side of the heat exchange assembly 2 facing the battery cell 1 is used to exchange heat with the battery cell 1. A heat insulation member 210 is disposed on the side of the heat exchange assembly 2 away from the battery cell 1. The heat insulation member 210 can better isolate the heat exchange assembly 2 and the environment, increase the thermal resistance of the heat exchange assembly 2, thereby reducing the heat exchange between the heat exchange assembly 2 and the environment, reducing the heat diffusion of the heat exchange assembly 2 to the environment, and improving the heat insulation performance of the heat exchange assembly 2. The rigid member 22 is connected to the at least two battery cells 1. The strength of the rigid member 22 is relatively higher, and it can bear the load from the battery cell 1. Moreover, the rigid member 22 can achieve heat exchange with the battery cell 1 through heat conduction, which is beneficial to maintaining good heat exchange efficiency and adjusting the temperature of the battery cell 1. The flexible member 21 is connected to the bottom side X2 of the rigid member 22, and the flexible member 21 does not contact the battery cell 1, which can avoid the battery cell 1 squeezing the flexible member 21. A heat insulation member 210 is disposed on the bottom side X2 of the flexible member 21. The heat insulation member 210 can isolate the flexible member 21 and the environment to a certain extent, and reduce the heat transfer between the flexible member 21 and the environment.

[0275] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; 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 various 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: include: At least two battery cells; A heat exchange assembly, wherein the heat exchange assembly comprises at least two heat exchange parts, at least one of which is configured as a flexible part, and at least one of which is configured as a rigid part, wherein the flexible part and the rigid part are stacked to form a medium flow channel, wherein the medium flow channel is used to conduct a heat exchange medium, and wherein the heat exchange medium is used to exchange heat with the at least two battery cells; wherein the flexible part is a layered structure, wherein the flexible part comprises a metal layer and a non-metal layer, and wherein the metal layer and the non-metal layer are stacked in sequence; Wherein, a heat preservation component is arranged on a side of the heat exchange assembly away from the at least two battery cells.

2. The battery device according to claim 1, characterized in that: The heat exchange assembly is arranged on the bottom side of the at least two battery cells, and the heat preservation component is attached to the bottom surface of the heat exchange assembly.

3. The battery device according to claim 1, characterized in that: The heat exchange assembly is arranged on the bottom side of the at least two battery cells, and at least a portion of the heat preservation component is spaced from the bottom surface of the heat exchange assembly to form a heat insulation cavity.

4. The battery device according to claim 3, characterized in that: The heat-insulating cavity is filled with air.

5. The battery device according to claim 1, characterized in that: The rigid component is connected to the at least two battery cells, the flexible component is arranged on the bottom side of the rigid component, and the heat preservation component is arranged on the bottom side of the flexible component.

6. The battery device according to claim 5, characterized in that: The heat-insulating component is formed on the bottom side of the flexible component by hot pressing.

7. The battery device according to claim 1, characterized in that: The battery device comprises a box body, the at least two battery cells are arranged in the box body, and the rigid member is configured as a part of the box body.

8. The battery device according to claim 7, characterized in that: The box body includes a box body, the rigid part includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, and takes a plane perpendicular to the top and bottom directions as a projection surface, the projection of the flexible part is located within the projection range of the main body area, the flexible part and the main body area define the medium flow channel, the avoidance area is connected to the box body, the rigid part and the box body jointly define a accommodating cavity, and the at least two battery cells are located in the accommodating cavity.

9. The battery device according to claim 7, characterized in that: The at least two battery cells are connected to the rigid member.

10. The battery device according to any one of claims 1 to 9, characterized in that: The flexible member includes a metal plasticized film.

11. The battery device according to claim 10, characterized in that: The flexible member comprises an aluminum-plastic film.

12. The battery device according to claim 1, characterized in that: The metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

13. The battery device according to claim 1, characterized in that: The non-metallic layer is a hot-melt layer.

14. The battery device according to any one of claims 1 to 9, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

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

16. The battery device according to any one of claims 1 to 9, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

17. The battery device according to any one of claims 1 to 9, characterized in that: The rigid member is configured as a metal plate.

18. An electrical equipment, characterized in that: A battery device comprising any one of claims 1 to 17.

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