Battery device, heat exchange assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, a heat exchange assembly and electric equipment.The battery device comprises at least two battery monomers and the heat exchange assembly, the heat exchange assembly is arranged on the bottom sides of the at least two battery monomers, the heat exchange assembly comprises at least two heat exchange pieces, and at least one heat exchange piece is a flexible piece; the at least one heat exchange piece is a rigid piece, the flexible piece and the rigid piece are arranged in a stacked mode 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 conducting heat exchange with the at least two single batteries; wherein at least one reinforcing piece is arranged inside and / or outside the flexible piece. At least one reinforcing part is arranged inside and / or outside the flexible part, the reinforcing part can provide an impact resistance effect, and the anti-collision performance of the flexible part can be improved, so that the anti-collision performance of the heat exchange assembly is improved, and the risk that the flexible part is deformed and damaged due to impact is reduced.

Description

Technical Field

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

[0002] A 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 in whole or in part. During the use of the battery device, the temperature of the battery cells in the battery device will rise, and it is necessary to control the temperature of the battery cells. Otherwise, it is easy to have an adverse impact on the performance and service life of the battery device. Therefore, how to improve the anti-collision performance of the heat exchange component while adjusting the temperature of the battery cells through the heat exchange component has become an important research direction in this field. Summary of the Utility Model

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

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

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

[0007] At least two battery cells;

[0008] A heat exchange component disposed on the bottom side of the at least two battery cells. The heat exchange component includes at least two heat exchange members, at least one of the heat exchange members is configured as a flexible member, and at least one of the heat exchange members is configured as a rigid member. The flexible member and the rigid member are stacked to form a medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells;

[0009] Wherein, at least one reinforcing member is disposed inside and / or outside the flexible member.

[0010] In the battery device provided by the embodiment of the present application, the heat exchange component is used for heat exchange with the battery cell. By setting the heat exchange component to include a flexible member and a rigid member, the flexible member has a light mass, which is beneficial to reducing the mass of the heat exchange component, reducing the production cost of the heat exchange component, and is also beneficial to reducing the mass of the battery device. The rigid member can enhance the structural strength of the heat exchange component so that the heat exchange component can better carry the battery cell. 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. At least one reinforcing member is arranged inside and / or outside the flexible member. The reinforcing member can provide an anti-impact effect, can enhance the anti-collision performance of the flexible member, thereby enhancing the anti-collision performance of the heat exchange component, and reducing the risk of deformation and damage of the flexible member due to impact.

[0011] In some embodiments, both the reinforcing member and the flexible member are in a layered structure, and the reinforcing member is stacked on the outer surface of the flexible member along the stacking direction or between two adjacent layers inside the flexible member.

[0012] In this embodiment, the flexible member is in a layered structure, which is beneficial for the flexible member and the rigid member to cooperate to form a medium flow channel; the reinforcing member is in a layered structure, which is beneficial for the reinforcing member to have a large-area contact with the flexible member to provide a structural strengthening effect for multiple parts of the flexible member.

[0013] In some embodiments, the reinforcing member is in a net shape.

[0014] In this embodiment, the reinforcing member is in a net shape. The net-shaped reinforcing member has good elastic deformation ability and strength, and also has the characteristic of light self-weight. It can enhance the toughness of the flexible member. In the case of collision, the net-shaped reinforcing member prompts the flexible member to rebound to restore deformation, thereby enhancing the anti-collision ability of the heat exchange component.

[0015] In some embodiments, the reinforcing member is of a soft structure.

[0016] In this embodiment, the reinforcing member is of a soft structure. The reinforcing member has elasticity, can absorb kinetic energy by elastic deformation, and can also restore elastic deformation.

[0017] In some embodiments, the reinforcing member is made of one of fiber, polyethylene terephthalate, and polyimide.

[0018] In this embodiment, fiber, polyethylene terephthalate, and polyimide all have good anti-impact performance, can increase the anti-deformation ability of the flexible member, and enhance the deformation and rebound ability of the flexible member.

[0019] In some embodiments, the reinforcing member and the flexible member jointly define a buffer cavity.

[0020] In this embodiment, when the flexible member is collided, the buffer cavity can absorb energy through deformation, playing a role in slowing down the impact.

[0021] In some embodiments, at least one of the buffer cavities is provided with a non-Newtonian fluid.

[0022] In this embodiment, a non-Newtonian fluid is provided in the buffer cavity. On the one hand, under normal circumstances, the heat exchange component basically only receives the expansion force of the battery cell, and the expansion force is usually relatively small and will not cause a sharp increase in the viscosity of the non-Newtonian fluid. In this way, the buffer cavity filled with the non-Newtonian liquid can undergo compressive deformation to provide an expansion space for the battery cell, meeting the expansion space requirements during the normal use of the battery cell; on the other hand, when receiving a large impact force, such as when being bumped during vehicle driving, the viscosity of the non-Newtonian fluid instantaneously increases to form a buffer, disperse stress, prevent the flexible member from deforming, and improve the anti-collision ability of the flexible member.

[0023] In some embodiments, the battery device includes a box body, and the at least two battery cells are disposed in the box body, and the heat exchange component is integrated into the box body.

[0024] In this embodiment, the heat exchange component is integrated into the box body. The heat exchange component is connected to the box body or the heat exchange component can be a part of the structure of the box body. The box body can provide support for the heat exchange component, which is beneficial to improving the overall structural strength and stability of the battery device.

[0025] In some embodiments, the rigid member includes an avoidance area and a main body area. The avoidance area surrounds the outer periphery of the main body area. Taking the 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, and the avoidance area is connected to the box body.

[0026] In this embodiment, 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 and the avoidance area are basically not in contact, thereby reducing the influence on the flexible member during the assembly process of the avoidance area and the box body.

[0027] In some embodiments, the heat exchange component is located in the box body, and the at least two battery cells are connected to the rigid member.

[0028] In this embodiment, the heat exchange component is located in the box body. The box body can protect the heat exchange component and reduce the risk of the heat exchange component being impacted. The at least two battery cells are connected to the rigid member. The rigid member supports the battery cells, and the rigid member can maintain its shape more stably and can carry the battery cells more smoothly.

[0029] In some embodiments, the flexible member includes a metalized film.

[0030] In this embodiment, since the metalized plastic film is thin and light in weight, and a dielectric flow channel is formed between the metalized plastic film and the rigid member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 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 and the internally flowing heat exchange medium can also be reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0031] In some embodiments, the flexible member includes an aluminum-plastic film.

[0032] In this embodiment, the flexible member is 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.

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

[0034] In this embodiment, the flexible member formed by sequentially stacking the metal layer and the non-metal layer is thin and light in weight, and a dielectric flow channel is formed between the flexible member and the rigid member, which 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 internally flowing heat exchange medium, so there is no possibility of corrosion and leakage.

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

[0036] The non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0037] In this embodiment, by setting the metal layer as one of aluminum foil, copper foil, and steel foil, the flexible member can have certain structural strength and can play an isolation role. By setting the non-metal layer as one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member can have certain waterproof properties and / or corrosion resistance to the heat exchange medium.

[0038] In some embodiments, the non-metal layer is a hot melt layer.

[0039] 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.

[0040] In some embodiments, the thickness of the flexible member is 0.05 mm - 0.3 mm.

[0041] 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.

[0042] In some embodiments, the thickness of the flexible member is 0.08 mm - 0.2 mm.

[0043] 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.

[0044] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa - 10000 MPa.

[0045] In this embodiment, by setting the elastic modulus of the flexible member to 0.1 MPa - 10000 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 cells, thereby increasing the effective heat exchange area between the heat exchange assembly and the box body and / or the battery cells, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

[0046] In some embodiments, the rigid member is set as a metal plate.

[0047] 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.

[0048] An embodiment of the present application provides a heat exchange assembly, the heat exchange assembly includes at least two heat exchange members, at least one of the heat exchange members is set as a flexible member, at least one of the heat exchange members is set as a rigid member, the flexible member and the rigid member are stacked to form a medium flow channel, the medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells;

[0049] Wherein, at least one reinforcing member is arranged inside and / or outside the flexible member.

[0050] An embodiment of the present application provides an electrical equipment, including the battery device described in any one of the above or the heat exchange assembly described above. Description of the Drawings

[0051] Figure 1 Schematic structural diagram of a vehicle in some embodiments of the present application;

[0052] Figure 2 Explosion diagram of a battery device in some embodiments of the present application;

[0053] Figure 3 Is Figure 2 Explosion diagram of the heat exchange component in;

[0054] Figure 4 Is Figure 3 Assembly diagram of the heat exchange component in;

[0055] Figure 5 Explosion diagram of a flexible member and a reinforcing member in some embodiments of the present application;

[0056] Figure 6 Assembly diagram of the heat exchange component in some embodiments of the present application;

[0057] Figure 7 Is Figure 6 Cross-sectional view in the A-A direction in;

[0058] Figure 8 Explosion diagram of a flexible member and a reinforcing member in some other embodiments of the present application;

[0059] Figure 9 Explosion diagram of a flexible member and a reinforcing member in yet some other embodiments of the present application;

[0060] Figure 10 Explosion diagram of a flexible member and a reinforcing member in still some other embodiments of the present application.

[0061] Explanation of reference numerals

[0062] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 2b, buffer chamber; 21, flexible member; 211, metal layer; 212, non-metal layer; 22, rigid member; 221, avoidance area; 222, main body area; 201, reinforcing member; 23, connecting member; 3, box body; 31, annular frame; 32, top cover; 33, bottom guard plate. Detailed description of the embodiments

[0063] 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 thus are only examples and cannot be used to limit the protection scope of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0065] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0066] It should be noted that in this application, "at least two" includes two and more than two. "Multiple" includes two and more than two.

[0067] Please refer to Figure 1 and Figure 2 , for ease of understanding the battery device 100 and the electrical device provided by the embodiments of this application, first introduce some basic structures of the battery cell 1, the battery device 100, and the electrical device provided by the embodiments of this application.

[0068] In the embodiments of this application, the battery cell 1 can be a secondary battery, and a secondary battery refers to a battery cell that can be activated by charging after discharging to continue use.

[0069] The battery cell 1 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of this application do not limit this.

[0070] The battery cell 1 generally includes an electrode assembly, and the electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0071] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0072] 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.

[0073] As an example, the positive electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and 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 can include a polymer material substrate layer 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.).

[0074] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as 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 phosphates can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), composites of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), composites of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and composites of lithium manganese iron phosphate and carbon, etc.

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0076] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and 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 can 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 a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0078] 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 any one or both of the two opposite surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material can be the negative electrode active material for battery cell 1 known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, this 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.

[0080] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0081] In some embodiments, the separator is a separator membrane. This application has no particular limitation on the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0082] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator membrane.

[0083] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously plays the role of transporting ions and isolating the positive and negative electrodes.

[0084] In some embodiments, battery cell 1 further includes an electrolyte, and the electrolyte plays the role of conducting ions between the positive and negative electrodes. This application has no specific limitation on the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0085] Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0086] In some embodiments, the electrolyte salts can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluorooxalate phosphate.

[0087] In some embodiments, the solvent may 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 may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0088] In some embodiments, the electrolyte may optionally further include an additive. For example, the additive may include a negative electrode film-forming additive, may also include a positive electrode film-forming additive, and may further include an additive capable of improving certain properties of the battery cell 1, such as an additive for improving the overcharge / quick charge performance of the battery cell 1, an additive for improving the high-temperature performance of the battery cell 1, an additive for improving the low-temperature performance of the battery cell 1, etc.

[0089] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0090] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0091] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid, cellulose, etc.

[0092] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0093] The electrode assembly may be a wound structure, may also be a stacked structure, or may be a mixed structure of winding and stacking.

[0094] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0095] In some embodiments, the electrode assembly is a stacked structure.

[0096] As an example, a plurality of positive electrode sheets and negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0097] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0098] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments arranged in a stacked manner.

[0099] As an example, a plurality of separators may be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0100] As an example, the separators may be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0101] In some embodiments, the shape of the electrode assembly may be cylindrical, flat or prismatic, etc.

[0102] 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 positive electrode tabs and negative electrode tabs.

[0103] 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 shell) 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 plays a role in protecting the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag 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.

[0104] As an example, the battery cell 1 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc., and there is no special limitation in this application.

[0105] 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.

[0106] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab or indirectly connected to the electrode tab through a current collector member. The electrode terminal may be provided on the end cap or on the housing body.

[0107] In some embodiments, a pressure relief mechanism is provided on the outer casing. The pressure relief mechanism is used to discharge the internal gas of the battery cell 1.

[0108] 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 the 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 discharged. This threshold design varies according to different design requirements. The threshold may depend on one or several of the materials of the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell 1.

[0109] As an example, the pressure relief mechanism can be integrally formed with the outer casing.

[0110] As an example, the pressure relief mechanism can also be separately provided and connected to the outer casing.

[0111] The "actuation" mentioned in this application means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 1 can be discharged. 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 channel, at least a part of the pressure relief mechanism breaks, is crushed, is torn, or is opened, and so on. 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 de-temperatureed under a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0112] In some embodiments, when the outer casing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell 1.

[0113] The emissions from the battery cell 1 mentioned in this application include but are not limited to: electrolytes, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, and so on.

[0114] The battery device 100 provided in the embodiments of this application includes the battery cell 1 in any one of the embodiments of this application.

[0115] 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.

[0116] 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 achieve electrical connection between at least two battery cells 1.

[0117] Exemplarily, a series-parallel 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 series-parallel combination; of course, it can also be that at least two battery cells 1 are first connected in series, parallel, or in a series-parallel combination to form a module, and then the modules are connected in series, parallel, or in a series-parallel combination to form an entirety.

[0118] In some embodiments, a battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 1.

[0119] 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.

[0120] In some embodiments, the battery device 100 can be a battery pack (battery Pack).

[0121] The battery device 100 can include a box body 3. As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body 3 by fixing the battery module in the box body 3.

[0122] As an example, the battery cell assembly can also be accommodated in the box body 3 by directly fixing a plurality of battery cells 1 to the box body 3.

[0123] In some embodiments, the box body 3 can be part of the chassis structure of a vehicle. For example, a part of the box body 3 can become at least a part of the floor of the vehicle, or a part of the box body 3 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0124] An embodiment of the present application provides an electrical device, which includes the battery device 100 in any one of the embodiments of the present application or the heat exchange component 2 in any one of the embodiments of the present application. The battery device 100 is used to store or provide electrical energy.

[0125] 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, vehicles can include battery cars and electric vehicles, electric toys can include battery car toys and electric vehicle toys, etc., fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric plane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0126] The energy storage device includes but is not limited to energy storage containers or energy storage cabinets, etc.

[0127] In the following embodiments, for the sake of convenience of description, the electrical equipment in an embodiment of the present application is taken as an example of a vehicle 1000 for illustration. The following will be described with reference to the accompanying drawings.

[0128] Figure 1 The structural schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As Figure 1 shown, a battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, the front or the rear of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can 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, navigation and driving of the vehicle 1000.

[0129] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used 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.

[0130] 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 environmental temperature is low and it is necessary to heat up the battery cells, the heat exchange component releases heat to the battery cells. In some cases, the battery device is placed on the chassis of the vehicle. During the driving of the vehicle, stones or other objects on the road are likely to impact the battery device upward, and the heat exchange component is likely to be knocked, resulting in deformation or damage of the heat exchange component.

[0131] 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 is disposed on the bottom side of at least two battery cells. 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. The medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells. Wherein, at least one reinforcing element is disposed inside and / or outside the flexible element.

[0132] In the battery device provided in the embodiment of the present application, the heat exchange component is used to exchange heat with the battery cell. By configuring the heat exchange component to include a flexible part and a rigid part, the weight of the flexible part is relatively light, which is beneficial 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 rigid part can improve the structural strength of the heat exchange component so that the heat exchange component can better carry the battery cell. The flexible part and the rigid part are stacked to form at least one medium flow channel. The rigid part can support the flexible part, 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. At least one reinforcement member is arranged inside and / or outside the flexible part. The reinforcement member can provide impact resistance and improve the anti-collision performance of the flexible part, thereby improving the anti-collision performance of the heat exchange component and reducing the risk of deformation and damage of the flexible part due to impact.

[0133] 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 10 An embodiment of the present application provides a battery device 100 , which includes at least two battery cells 1 and a heat exchange component 2 .

[0134] See also Figures 2 to 10 The embodiment of the present application provides a heat exchange assembly 2, which is arranged on the bottom side X2 of at least two battery cells 1. 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, and the medium flow channel 2a is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1. At least one reinforcement member 201 is arranged inside and / or outside the flexible part 21.

[0135] 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.

[0136] The rigidity in the rigid member 22 refers to the material property of the structure. This 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 and 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.

[0137] 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.

[0138] 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 flexible functions, it can also enable the heat exchange assembly 2 to have a certain structural strength.

[0139] 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.

[0140] 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.

[0141] It should be noted that the specific number of the medium flow channels 2a is not limited here. It can be one or multiple.

[0142] 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.

[0143] 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.

[0144] The statement that at least one heat exchange member is set 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 set as the rigid members 22, the rigid members 22 can be the same or different.

[0145] 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.

[0146] 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.

[0147] The heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1, which means that the heat exchange assembly 2 is located on the side of at least two battery cells 1 close to the ground.

[0148] It should be noted that the top side X1 and the bottom side X2 are two opposite sides in the top-bottom direction X. Usually, the bottom side X2 faces the ground and the top side X1 faces the sky.

[0149] The statement that at least one reinforcing member 201 is disposed inside and / or outside the flexible member 21 means that, referring to Figure 5 , it can be that at least one reinforcing member 201 is disposed only inside the flexible member 21, referring to Figure 9 , or it can be that at least one reinforcing member 201 is disposed only outside the flexible member 21, referring to Figure 10 , or it can be that at least one reinforcing member 201 is disposed both inside and outside the flexible member 21. The number of the reinforcing members 201 can be one or more.

[0150] The reinforcing member 201 is a structure capable of enhancing the structural strength. The reinforcing member 201 can provide an anti-impact effect. At least one reinforcing member 201 is disposed inside and / or outside the flexible member 21, which improves the anti-collision performance of the flexible member 21 and reduces the risk of the flexible member 21 being damaged by impact.

[0151] 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 weight, which is beneficial to reducing the weight of the heat exchange component 2 and the production cost of the heat exchange component 2, and is also beneficial to reducing the weight of the battery device 100. The rigid member 22 can improve the structural strength of the heat exchange component 2 so that the heat exchange component 2 can better carry the battery cell 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2 and improving the applicability of the heat exchange component 2. At least one reinforcing member 201 is disposed inside and / or outside the flexible member 21. The reinforcing member 201 can provide an anti-impact effect and can improve the anti-collision performance of the flexible member 21, thereby improving the anti-collision performance of the heat exchange component 2 and reducing the risk of the flexible member 21 being deformed or damaged by impact.

[0152] In some embodiments, please refer to Figures 5 to 10 , both the reinforcing member 201 and the flexible member 21 are layered structures. The reinforcing member 201 is stacked on the outer surface of the flexible member 21 along the stacking direction or between two adjacent layers inside the flexible member 21.

[0153] The layered structure refers to a structure in which a single layer or multiple layers are spread in a plane or curved surface form, and the multiple layers can be parallel to each other or stacked regularly.

[0154] It should be noted that the reinforcing member 201 can be a single-layer or multi-layer layered structure. The flexible member 21 can be a single-layer or multi-layer layered structure.

[0155] As an example, the reinforcing member 201 can be stacked on the outer surface of the flexible member 21 along the stacking direction. In other words, the reinforcing member 201 covers the outer surface of the flexible member 21 along the stacking direction. Here, the flexible member 21 can be a single-layer or multi-layer layered structure, and the reinforcing member 201 can be a single-layer or multi-layer layered structure.

[0156] As an example, the reinforcing member 201 can be stacked between two adjacent layers inside the flexible member 21. In other words, the reinforcing member 201 is sandwiched between two adjacent layers inside the flexible member 21. Here, the flexible member 21 is a multi-layer layered structure, and the reinforcing member 201 can be a single-layer or multi-layer layered structure.

[0157] In this embodiment, the flexible member 21 is in a layered structure, which is beneficial to the flexible member 21 and the rigid member 22 to cooperate to form the medium flow channel 2a; the reinforcing member 201 is in a layered structure, which is beneficial to the reinforcing member 201 to contact the flexible member 21 with a large area to provide a structural strengthening effect for multiple parts of the flexible member 21.

[0158] In some embodiments, the reinforcing member 201 is in a mesh shape.

[0159] The mesh shape is a grid shape formed by the interweaving of multiple connecting units. Among them, the mesh shape has macroscopic pores.

[0160] In this embodiment, the reinforcing member 201 is in a mesh shape. The mesh-shaped reinforcing member 201 has good elastic deformation ability and strength, and also has the characteristic of light self-weight. It can improve the toughness of the flexible member 21. In the case of collision, the mesh-shaped reinforcing member 201 prompts the flexible member 21 to rebound to restore deformation, thereby improving the anti-collision ability of the heat exchange assembly 2.

[0161] In some embodiments, the reinforcing member 201 can be a dense film or a porous film. A dense film refers to a layered structure without micropores and macroscopic pores. A porous film refers to a layered structure with micropores.

[0162] Micropores are pores with a pore diameter of 1 millimeter or less. Macroscopic pores are pores with a pore diameter greater than 1 millimeter. The pores of the mesh-shaped reinforcing member 201 are macroscopic pores.

[0163] In some embodiments, the reinforcing member 201 is a soft structure.

[0164] A soft structure refers to a structure with elasticity that can undergo elastic deformation to absorb kinetic energy.

[0165] In this embodiment, the reinforcing member 201 is a soft structure. The reinforcing member 201 has elasticity, can absorb kinetic energy by undergoing elastic deformation, and can also restore elastic deformation.

[0166] In some embodiments, the reinforcing member 201 is made of one of fiber, polyethylene terephthalate, and polyimide.

[0167] In some embodiments, the reinforcing member 201 is made of multiple of fiber, polyethylene terephthalate, and polyimide.

[0168] The type of fiber is not limited. Exemplarily, the fiber includes but is not limited to carbon fiber.

[0169] Exemplarily, a mesh-shaped reinforcing member 201 can be formed by using fiber as the connecting unit.

[0170] Exemplarily, polyethylene terephthalate (PET, Polyethylene Terephthalate) can form a dense film-shaped reinforcing member 201.

[0171] Exemplarily, polyimide (PI, Polyimide) can form a dense film-shaped reinforcing member 201.

[0172] In this embodiment, the fiber, polyethylene terephthalate and polyimide all have good impact resistance, which can increase the anti-deformation ability of the flexible member 21 and improve the deformation and resilience ability of the flexible member 21.

[0173] In some examples, the reinforcing member 201 may adopt a double-layered structure composed of polyethylene terephthalate and polyimide.

[0174] In some examples, the reinforcing member 201 may adopt a single-layered mesh structure composed of fibers.

[0175] In some embodiments, please refer to Figure 6 and Figure 7 , the reinforcing member 201 and the flexible member 21 jointly define a buffer cavity 2b.

[0176] As an example, the reinforcing member 201 may adopt a dense film.

[0177] The number of the buffer cavities 2b is not limited, and the number of the buffer cavities 2b may be one or more, etc.

[0178] In this embodiment, when the flexible member 21 is collided, the buffer cavity 2b can absorb energy through deformation and play a role in buffering the impact.

[0179] In some embodiments, the buffer cavity 2b may be filled with air.

[0180] In some embodiments, the buffer cavity 2b may also be filled with gaseous substances such as inert gases.

[0181] In some embodiments, at least one buffer cavity 2b is provided with non-Newtonian fluid.

[0182] Taking one buffer cavity 2b as an example, the buffer cavity 2b may be filled with non-Newtonian fluid.

[0183] Taking multiple buffer cavities 2b as an example, one buffer cavity 2b may be filled with air, and the remaining buffer cavities 2b may be filled with non-Newtonian fluid. In other examples, one buffer cavity 2b may be filled with non-Newtonian fluid, and the remaining buffer cavities 2b may be filled with air. In still other examples, all buffer cavities 2b may be filled with non-Newtonian fluid.

[0184] Non-Newtonian fluid refers to a class of fluids that do not conform to Newton's viscosity law. Non-Newtonian fluids have the following characteristics: they exhibit low viscosity and are relatively soft when subjected to small or conforming forces, while when subjected to large or rapid impact forces, their viscosity will increase sharply and they will exhibit the hardness and impact resistance similar to solids.

[0185] In this embodiment, a non-Newtonian fluid is provided in the buffer cavity 2b. On the one hand, under normal circumstances, the heat exchange component 2 basically only receives the expansion force of the battery cell 1, and the expansion force is usually relatively small and will not cause a sharp increase in the viscosity of the non-Newtonian fluid. In this way, the buffer cavity 2b filled with the non-Newtonian liquid can undergo compressive deformation to provide an expansion space for the battery cell 1 and meet the expansion space requirements during the normal use of the battery cell 1. On the other hand, when subjected to a large impact force, for example, when the vehicle is bumped during driving, the viscosity of the non-Newtonian fluid instantaneously increases to form a buffer, disperse stress, prevent the flexible member 21 from deforming, and improve the anti-collision ability of the flexible member 21.

[0186] In some embodiments, 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 heat exchange component 2 is integrated into the box body 3.

[0187] The box body 3 can be used to contain the battery cell 1 and other structural members, provide protection for the battery cell 1 and other structural members, and reduce the influence of foreign objects outside the box body 3 on the charging or discharging of the battery cell 1.

[0188] The heat exchange component 2 is integrated into the box body 3, that is to say, the heat exchange component 2 is connected to the box body 3 or the heat exchange component 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 component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0189] As an example, the heat exchange component 2 and the box body 3 can be connected by non-detachable connection or detachable connection and other means.

[0190] 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.

[0191] As an example, the heat exchange component 2 being a part of the structure of the box body 3 means that the heat exchange component 2 constitutes part of the side wall of the box body 3. For example, the rigid member 22 can constitute the bottom wall and / or the peripheral side wall of the box body 3, etc.

[0192] In this embodiment, the heat exchange component 2 is integrated into the box body 3, the heat exchange component 2 is connected to the box body 3 or the heat exchange component 2 can be a part of the structure of the box body 3, and the box body 3 can provide support for the heat exchange component 2, which is beneficial to improving the overall structural strength and stability of the battery device 100.

[0193] The shape of the box body 3 is not limited. Exemplarily, the box body 3 can be a simple three-dimensional structure such as a separate hexahedron, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as a hexahedron, cylinder, or sphere. In one example, the box body 3 can be rectangular parallelepiped-shaped, and both the length direction and the width direction of the box body 3 are parallel to the horizontal plane, and the length direction of the box body 3 is parallel to the longest side of the rectangular parallelepiped.

[0194] 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.

[0195] 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.

[0196] Exemplarily, please refer to Figures 2 to 4 , the heat exchange component 2 further includes a connector 23 with an inlet and a connector 23 with an outlet, and the connector 23 is connected to the rigid member 22.

[0197] The material of the connector 23 includes but is not limited to metal, plastic, etc.

[0198] Exemplarily, the connector 23 is brazed to the rigid member 22.

[0199] Exemplarily, the connector 23 is, for example, a water nozzle.

[0200] The principle of the heat exchange component 2 for heat exchanging with 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 with the battery cell 1.

[0201] Here, the heat exchange component 2 for heat exchanging with the battery cell 1 can dissipate heat from the battery cell 1 or heat the battery cell 1.

[0202] The principle of the heat exchange component 2 for dissipating heat from the battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium absorbs the heat generated during the operation of the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, releasing the heat and completing the cooling and heat dissipation of the battery cell 1.

[0203] 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 achieve 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.

[0204] In some embodiments, the elongation at break of the flexible member 21 is greater than that of the rigid member 22.

[0205] 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 extensibility of the material when it is stretched under force.

[0206] 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 extensibility 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.

[0207] 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.

[0208] In some embodiments, the elongation at break of the flexible member 21 is in the range of 30% to 300%.

[0209] 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.

[0210] In this embodiment, by setting the elongation at break of the flexible member 21 in the range of 30% to 300%, the flexible member 21 can have a certain impact resistance and puncture resistance while also having a certain structural strength.

[0211] In some embodiments, the elongation at break of the rigid member 22 is in the range of 1% to 50%.

[0212] The elongation at break of the rigid member 22 can be a point value of any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or a point value between any two of them.

[0213] In this embodiment, by setting the fracture elongation rate of the rigid member 22 to be in the range of 1% to 50%, the rigid member 22 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 2.

[0214] In some embodiments, the elastic modulus of at least a part of the flexible member 21 is less than that of the rigid member 22.

[0215] Here, it can be that the elastic modulus of a part of the flexible member 21 is less than that of the rigid member 22, or the elastic modulus of all regions of the flexible member 21 is less than that of the rigid member 22.

[0216] 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.

[0217] 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.

[0218] The measurement methods of the elastic moduli of the flexible member 21 and the rigid member 22 may include at least one of a static tensile test method, a dynamic test method, a sound velocity method, a nanoindentation method, and a bending method. The measuring instruments may include a nanoindenter and a universal testing machine.

[0219] Exemplarily, at normal temperature and pressure, the elastic moduli 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.

[0220] 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.

[0221] Integrating 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.

[0222] 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.

[0223] At least two battery cells 1 are connected to the rigid member 22. It can be that two, three, or more battery cells 1 are connected to the rigid member 22. Exemplarily, all battery cells 1 are connected to the rigid member 22.

[0224] The manner in which the battery cell 1 is connected 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.

[0225] The heat-conducting structure refers to a structure made of a good heat conductor. 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, improving the heat exchange efficiency.

[0226] 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.

[0227] 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, reducing 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, 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 without substantial damage.

[0228] In some embodiments, the rigid member 22 can be a flat plate structure with planes on both sides in the thickness direction.

[0229] 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.

[0230] In some embodiments, please refer to Figures 2 to 4 , 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, and the avoidance area 221 is connected to the box body 3.

[0231] 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.

[0232] 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.

[0233] In this embodiment, the size of the flexible member 21 is smaller than that of the rigid member 22. The flexible member 21 is within the range of the main body area 222 and is substantially 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 body 3.

[0234] In some embodiments, the rigid member 22 can be a flat plate structure with flat surfaces on both sides in the thickness direction. The avoidance area 221 and the main body area 222 can be virtually divided from the rigid member 22 by a dotted line L or a solid line.

[0235] In some cases, the box body 3 and the heat exchange assembly 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 during welding to melt the flexible member 21.

[0236] As an example, the avoidance area 221 and the box body 3 can be welded by friction stir welding (i.e., FSW, Friction Stir Welding).

[0237] 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.

[0238] In this embodiment, since the projection of the flexible member 21 is within the projection range of the main body area 222, during the welding of the avoidance area 221 and the box body 3, 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 welding.

[0239] It should be noted that the unit "°C" is degrees Celsius.

[0240] In some cases, the box body 3 and the heat exchange assembly 2 are connected by screws, and the high temperature caused by the high-speed rotation of the screws may also melt the flexible member 21.

[0241] In some embodiments, the avoidance area 221 and the box body 3 are connected by fasteners.

[0242] Fasteners include but are not limited to screws or bolts, etc.

[0243] In one example, the width dimension of the avoidance area 221 is between 5 mm and 10 mm.

[0244] As an example, the avoidance area 221 and the box body 3 can be connected by fasteners using the flow drill screw process (Flow Drill Screw, FDS).

[0245] In this embodiment, since the projection of the flexible member 21 is within the projection range of the main body region 222, during the fastening assembly of the avoidance region 221 and the box body 3, the distance between the fastener and the flexible member 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 member 21, thereby reducing the risk of local melting of the flexible member 21 during the connection through the fastener.

[0246] In some embodiments, the width dimension of the avoidance region 221 is between 5 mm and 15 mm. Preferably, the width dimension of the avoidance region 221 is between 10 mm and 15 mm.

[0247] Exemplarily, the width dimension of the avoidance region 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.

[0248] The width dimension of the avoidance region 221 refers to the distance between the boundary line between the avoidance region 221 and the main body region 222 and the edge line of the avoidance region 221.

[0249] In this embodiment, the width dimension of the avoidance region 221 is appropriate. There is sufficient space for connection with the box body 3 to avoid the flexible member 21, and it can also avoid occupying the area of the main body region 222 as much as possible. The main body region 222 retains enough area to form the medium flow channel 2a, taking into account the heat exchange requirements.

[0250] It should be noted that the unit "mm" is millimeter.

[0251] In some embodiments, please refer to Figure 2 , the heat exchange assembly 2 is located inside the box body 3, and at least two battery cells 1 are connected to the rigid member 22.

[0252] In this embodiment, the heat exchange assembly 2 is located inside the box body 3. The box body 3 can protect the heat exchange assembly 2 and reduce the risk of the heat exchange assembly 2 being impacted. At least two battery cells 1 are connected to the rigid member 22. The rigid member 22 supports the battery cells 1, and the rigid member 22 can maintain its shape more stably and can carry the battery cells 1 more smoothly.

[0253] In some embodiments, please refer to Figure 2 and Figure 3, the housing 3 includes an annular frame 31, a top cover 32 and a bottom guard plate 33. The annular frame 31 has a top-side opening and a bottom-side opening; the top cover 32 closes the top-side opening of the annular frame 31; the bottom guard plate 33 closes the bottom-side opening of the annular frame 31. The top cover 32, the annular frame 31 and the bottom guard plate 33 jointly define a receiving cavity, and at least two battery cells 1 and the heat exchange component 2 are both located in the receiving cavity, and the heat exchange component 2 is connected to the annular frame 31.

[0254] As an example, the heat exchange component 2 and the annular frame 31 can be welded or connected by fasteners. For example, the rigid member 22 can be welded to the annular frame 31 or connected by fasteners.

[0255] 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, and the side plates can be extruded plate-shaped profiles, and the four side plates are welded together in sequence along the circumference to form the annular frame 31.

[0256] The receiving cavity can be a sealed space or a non-sealed space.

[0257] The top cover 32 can be welded to the annular frame 31 or connected by fasteners.

[0258] The bottom guard plate 33 can be welded to the annular frame 31 or connected by fasteners.

[0259] In this embodiment, the heat exchange components 2 are all located in the receiving cavity, and the housing 3 can protect the heat exchange components 2 and reduce the risk of impurities or other objects contacting the heat exchange components 2. The heat exchange component 2 is connected to the annular frame 31, and the battery cell 1 can be connected to the heat exchange component 2 to facilitate heat exchange between the battery cell 1 and the heat exchange medium.

[0260] In some embodiments, the housing 3 includes a lid, the lid faces the bottom-side opening, and the heat exchange component 2 closes the bottom-side opening of the lid to jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity.

[0261] As an example, a bottom guard plate 33 can be provided on the bottom side X2 of the heat exchange component 2, and the bottom guard plate 33 is connected to the lid. In this way, the bottom guard plate 33 can protect the flexible member 21.

[0262] As an example, a part of the rigid member 22 protrudes toward the bottom side X2 to form a recessed area, and the rigid member 22 closes the bottom-side opening of the lid. In other words, the lid and the heat exchange component 2 can be buckled relative to each other to define a receiving cavity.

[0263] The recessed area can be formed by stamping a plate-shaped rigid member 22.

[0264] In this embodiment, the bottom side of the cover of the heat exchange component 2 is open. The heat exchange component 2 serves as the bottom wall of the box body 3, which can reduce the overall weight of the battery device 100.

[0265] In some embodiments, the flexible member 21 and the rigid member 22 are hot-pressed to form a hot-pressed area and a medium flow channel 2a, and the flexible member 21 and the rigid member 22 are connected to each other in at least part of the hot-pressed area.

[0266] 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.

[0267] Here, the flexible member 21 is sealed by a hot pressing process. Through the hot pressing process, the sealing performance of the heat exchange component 2 can be effectively ensured, and it is not easy to crack.

[0268] 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.

[0269] 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.

[0270] In the related art, the heat exchange component is formed by welding two high-strength aluminum alloys. Since the high-strength aluminum alloys (such as 5 series, 6 series, etc.) have a relatively high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0271] In the embodiment of the present application, by setting the heat exchange component 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 and the rigid member 22 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.

[0272] In some embodiments, the flexible member 21 is in the form of a single-layer or multi-layer thin film.

[0273] In some embodiments, the flexible member 21 includes a metalized plastic film.

[0274] Here, the metalized plastic film is a metal-plastic composite material, that is, it includes a metal layer 211 and a plastic layer.

[0275] 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, so 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.

[0276] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0277] In this embodiment, the flexible member 21 is made of an aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the insulation and anti-corrosion requirements.

[0278] In some embodiments, please refer to Figure 5 、 Figure 8 、and Figure 9 and Figure 10 ,the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer 211 and a non-metal layer 212, and the metal layer 211 and the non-metal layer 212 are stacked in sequence.

[0279] Here, the flexible member 21 includes the metal layer 211 and the non-metal layer 212, that is, a composite member composed of the metal layer 211 and the non-metal layer 212.

[0280] Exemplarily, the metal layer 211 and the non-metal layer 212 can be formed by hot pressing or hot melting.

[0281] Here, the numbers of the metal layer 211 and the non-metal layer 212 are not limited.

[0282] In this embodiment, the flexible member 21 formed by stacking the metal layer 211 and the non-metal layer 212 in sequence is thin and light in weight, and a dielectric flow channel 2a is formed 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 internally flowing heat exchange medium, so there is no possibility of corrosion and leakage.

[0283] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer 211 and a non-metal layer 212, and the metal layer 211 and the non-metal layer 212 are stacked in sequence, wherein the non-metal layer 212 is disposed on the side of the metal layer 211 facing the rigid member 22.

[0284] That is to say, the non-metal layer 212 is located between the metal layer 211 and the rigid member 22.

[0285] Here, by disposing the non-metal layer 212 on the side of the metal layer 211 facing the rigid member 22, the non-metal layer 212 can be thermally pressed and connected to the rigid member 22.

[0286] In some embodiments, the metal layer 211 includes one of aluminum foil, copper foil, and steel foil.

[0287] In some embodiments, the metal layer 211 includes multiple ones of aluminum foil, copper foil, and steel foil.

[0288] In this embodiment, by setting the metal layer 211 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.

[0289] In some embodiments, the non-metal layer 212 includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0290] In some embodiments, the non-metal layer 212 includes multiple ones of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0291] In this embodiment, by setting the non-metal layer 212 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 heat exchange media.

[0292] Exemplarily, a non-metal layer 212 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 212 to make the non-metal layer 212 have acid and alkali corrosion resistance.

[0293] In some embodiments, the non-metal layer 212 is a hot melt layer.

[0294] In this embodiment, by setting the non-metal layer 212 as a hot melt layer, that is, composed of a hot melt material, it is beneficial to make the non-metal layer 212 and the metal layer 211 be compounded together through hot melting, with simple molding and high production efficiency.

[0295] In some embodiments, the thickness of the flexible member 21 is 0.05 mm - 0.3 mm.

[0296] 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.

[0297] In this embodiment, by setting the thickness of the flexible member 21 to be 0.05 mm - 0.3 mm, while the heat exchange assembly 2 made of the flexible member 21 has a certain structural strength, the overall thickness of the heat exchange assembly 2 is relatively small, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0298] In some embodiments, the thickness of the flexible member 21 is 0.08 mm - 0.2 mm.

[0299] 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.

[0300] In this embodiment, by setting the thickness of the flexible member 21 to be 0.08 mm - 0.2 mm, while the heat exchange assembly 2 made of the flexible member 21 has a certain structural strength, further, the overall thickness of the heat exchange assembly 2 is relatively small, which is beneficial to further reducing the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0301] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa - 10000 MPa.

[0302] Exemplarily, the elastic modulus of the flexible member 21 can 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.

[0303] In this embodiment, by setting the elastic modulus of the flexible member 21 to be 0.1 MPa - 10,000 MPa, the flexible member 21 has a certain structural strength, improving the reliability of the heat exchange assembly 2, and also has a certain deformation ability, which can improve the fitting degree of the heat exchange assembly 2 with 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.

[0304] In some embodiments, the rigid member 22 is provided as a metal plate.

[0305] Exemplarily, for example, it can be aluminum alloy.

[0306] In this embodiment, by setting the rigid member 22 as a metal plate, the metal plate has both good structural strength and good heat conduction performance. That is to say, while meeting a certain heat exchange efficiency of the heat exchange assembly 2, the rigid member 22 can also play a certain supporting role for the flexible member 21.

[0307] 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.

[0308] The plurality of sub-flow channels are communicated to form the medium flow channel 2a.

[0309] The extending direction of the sub-flow channel 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.

[0310] It can be understood that along the flowing direction of the heat exchange medium, the temperature of the heat exchange medium will gradually increase. Therefore, by making each battery cell 1 correspond to a plurality of sub-flow channels, it is beneficial to improve the temperature uniformity of the battery cell 1.

[0311] 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 7, the battery device 100 includes at least two battery cells 1 and a heat exchange component 2. The heat exchange component 2 is disposed on the bottom side X2 of the at least two battery cells 1. The heat exchange component 2 includes at least two heat exchange elements. At least one heat exchange element is set as a flexible member 21, and at least one heat exchange element 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 a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells 1. Both the reinforcing member 201 and the flexible member 21 are layered structures. The reinforcing member 201 is stacked on the outer surface of the flexible member 21 along the stacking direction. The reinforcing member 201 and the flexible member 21 jointly define a buffer cavity 2b, and at least one buffer cavity 2b is provided with a non-Newtonian fluid.

[0312] In this embodiment, the heat exchange component 2 is used to exchange heat with the battery cell 1. By setting the heat exchange component 2 to include 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 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 rigid member 22 can improve the structural strength of the heat exchange component 2 so that the heat exchange component 2 can better carry the battery cell 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2 and improving the applicability of the heat exchange component 2. The flexible member 21 is in a layered structure, which is beneficial to the flexible member 21 and the rigid member 22 to cooperate to form the medium flow channel 2a; the reinforcing member 201 is in a layered structure, which is beneficial to the large-area contact between the reinforcing member 201 and the flexible member 21 to provide structural enhancement for multiple parts of the flexible member 21. The non-Newtonian fluid is provided in the buffer cavity 2b. On the one hand, under normal circumstances, the heat exchange component 2 basically only receives the expansion force of the battery cell 1, and the expansion force is usually relatively small and will not cause the viscosity of the non-Newtonian fluid to increase sharply. In this way, the buffer cavity 2b filled with the non-Newtonian liquid can undergo compressive deformation to provide an expansion space for the battery cell 1 to meet the expansion space requirement during the normal use of the battery cell 1. On the other hand, when receiving a large impact force, such as being bumped during vehicle driving, the viscosity of the non-Newtonian fluid instantaneously increases to form a buffer, disperse the stress, prevent the flexible member 21 from deforming, and improve the anti-collision ability of the flexible member 21.

[0313] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting 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 embodiments of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that, Comprising: At least two battery cells; A heat exchange assembly disposed on the bottom side of the at least two battery cells, the heat exchange assembly including at least two heat exchange elements, at least one of the heat exchange elements being configured as a flexible member, at least one of the heat exchange elements being configured as a rigid member, the flexible member and the rigid member being stacked to form a medium flow channel for conducting a heat exchange medium, the heat exchange medium being used for heat exchange with the at least two battery cells; Wherein, at least one reinforcing member is disposed inside and / or outside the flexible member.

2. The battery device according to claim 1, wherein, Both the reinforcing member and the flexible member are in a layered structure, and the reinforcing member is stacked on the outer surface of the flexible member along the stacking direction or between two adjacent layers inside the flexible member.

3. The battery device according to claim 2, characterized in that, The reinforcing member is in a mesh shape.

4. The battery device according to claim 1, characterized in that, The reinforcing member is of a soft structure.

5. The battery device according to claim 1, characterized in that, The reinforcing member is made of one of fiber, polyethylene terephthalate and polyimide.

6. The battery device according to claim 1, characterized in that, The reinforcing member and the flexible member jointly define a buffer cavity.

7. The battery device according to claim 6, wherein At least one of the buffer cavities is provided with a non-Newtonian fluid.

8. The battery device according to claim 1, wherein The battery device includes a box body, the at least two battery cells are disposed inside the box body, and the heat exchange assembly is integrated into the box body.

9. The battery device according to claim 8, wherein, The rigid member includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, taking a plane perpendicular to the top-bottom direction as a 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, and the avoidance area is connected to the box body.

10. The battery device according to claim 8, wherein The heat exchange assembly is located inside the box body, and the at least two battery cells are connected to the rigid member.

11. The battery device according to any one of claims 1 to 10, characterized in that, The flexible member includes a metalized film.

12. The battery device according to claim 11, characterized in that, The flexible member includes an aluminum-plastic film.

13. The battery device according to any one of claims 1 to 10, characterized in that, The flexible member is in a layered structure, the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

14. The battery device according to claim 13, wherein, The metal layer includes one of aluminum foil, copper foil and steel foil; and / or, The non-metal layer includes one of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

15. The battery device according to claim 13, wherein, The non-metal layer is a heat-melt layer.

16. The battery device according to any one of claims 1 to 10, characterized in that, The thickness of the flexible member is 0.05 mm - 0.3 mm.

17. The battery device according to claim 16, characterized in that, The thickness of the flexible member is 0.08 mm - 0.2 mm.

18. The battery device according to any one of claims 1 to 10, characterized in that, The elastic modulus of the flexible member is 0.1 MPa - 10000 MPa.

19. The battery device according to any one of claims 1 to 10, characterized in that, The rigid member is configured as a metal plate.

20. A heat exchange component, characterized in that, The heat exchange assembly includes at least two heat exchange elements, at least one of the heat exchange elements being configured as a flexible member, at least one of the heat exchange elements being configured as a rigid member, the flexible member and the rigid member being stacked to form a medium flow channel for conducting a heat exchange medium, the heat exchange medium being used for heat exchange with the at least two battery cells; Wherein, at least one reinforcing member is disposed inside and / or outside the flexible member.

21. An electrical device, characterized in that, Comprising the battery device according to any one of claims 1 to 19 or the heat exchange assembly according to claim 20.

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