Battery device and electric equipment

Abstract

The invention relates to the technical field of batteries, and provides a battery device and electric equipment, the battery device comprises a box body, at least two battery monomers and a heat exchange assembly, and the at least two battery monomers are located in the box body; the heat exchange assembly is arranged on one side of the single battery, the heat exchange assembly comprises at least two heat exchange parts, at least one heat exchange part is a flexible part, at least one heat exchange part is a rigid part, the flexible part and the rigid part are stacked to form a medium flow channel, and the medium flow channel is used for conducting a heat exchange medium; the heat exchange medium is used for exchanging heat with at least two battery monomers; the surface of the heat exchange assembly is provided with a capillary structure. The capillary structure can absorb condensate water through capillary acting force, so that the condensate water can be dispersed in the capillary structure, gathering and flowing of the condensate water can be reduced, and the risk that the condensate water is gathered into liquid drops is reduced.

Description

Technical Field

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

[0002] The battery device can be used to store or provide electrical energy. The battery device can be used in electrical equipment, for example, the battery device can be used in a vehicle, etc.

[0003] In the related art, taking a vehicle as an example, in a vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. During the use of the battery device, the temperature of the battery cells in the battery device will rise, and the temperature of the battery cells needs to be controlled, otherwise it is easy to have an adverse effect on the performance and service life of the battery device. Therefore, how to reduce the condensation water in the battery device box while adjusting the temperature of the battery cells through the heat exchange component has become an important research direction in this field. Summary of the invention

[0004] In view of this, embodiments of the present application hope to provide a battery device and an electrical device that can reduce the accumulation and flow of condensed water.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows: The present application provides a battery device, including: Box; At least two battery cells are located in the box; a heat exchange assembly, arranged on one side of the battery cell, the heat exchange assembly comprising at least two heat exchange members, at least one of which is a flexible member, and at least one of which is 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; Wherein, the surface of the heat exchange component has a capillary structure.

[0006] 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 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. The capillary structure can absorb condensed water through capillary force, so that the condensed water can be dispersed in the capillary structure, which can reduce the aggregation and flow of condensed water and reduce the risk of condensed water agglomerating into droplets.

[0007] In some embodiments, the rigid member is disposed on a side of the flexible member away from the battery cell, and a surface of the flexible member facing the battery cell has the capillary structure.

[0008] In this embodiment, the flexible member has a certain flexibility, which can better fit the battery cell, thereby absorbing the assembly tolerance of the heat exchange component, improving the fit between the heat exchange component and the battery cell, and increasing the effective heat exchange area between the heat exchange component and the battery cell, thereby improving the heat exchange effect of the heat exchange component. The surface of the flexible member facing the battery cell has a capillary structure so that the capillary structure can absorb the condensed water on the surface of the battery cell in time, reducing the risk of condensed water gathering on the surface of the battery cell.

[0009] In some embodiments, the capillary structure is connected to the surface of the heat exchange component, or the surface of the heat exchange component is treated to form the capillary structure.

[0010] In this embodiment, the capillary structure and the heat exchange component can be manufactured separately and then connected together, which can reduce the difficulty of manufacturing the capillary structure and the heat exchange component. The surface of the heat exchange component facing the battery cell is treated to form a capillary structure, and the capillary structure can be attached to the surface of the heat exchange component facing the battery cell through atomic or molecular forces, which can save the assembly process between the capillary structure and the heat exchange component.

[0011] In some embodiments, the heat exchange component is disposed on the top side of the battery cell, the capillary structure faces the bottom side, and the pole of the battery cell faces the capillary structure; or, The heat exchange assembly is disposed on one side of the battery cell along a first direction, and the first direction is perpendicular to the top-bottom direction.

[0012] In this embodiment, since the pole is located at the top of the battery cell, the temperature gradient on the top side of the battery cell is large, and the fluid flowability of the fluid on the top of the battery cell is relatively poor, water vapor is easily condensed on the top side of the battery cell to form condensed water. The heat exchange component is arranged on the top side of the battery cell, and the capillary structure is facing the bottom side, that is, the capillary structure is facing the pole, which can absorb water vapor in the airflow in time and reduce the risk of water vapor condensing into condensed water. The box body usually reserves space in the first direction, which is easy to cause air retention, which is easy to cause water vapor to gather on the side of the battery cell along the first direction to produce condensed water. The heat exchange component is arranged on one side of the battery cell along the first direction, which can absorb the condensed water gathered on the side of the battery cell along the first direction in time.

[0013] In some embodiments, the heat exchange component includes a combining plate and a flow channel plate, the flow channel plate having a protrusion and a flow channel portion, the protrusion protruding toward the combining plate to connect the combining plate, the flow channel portion and the combining plate are spaced apart to form the medium flow channel, one of the flexible part and the rigid part is the combining plate, the other of the flexible part and the rigid part is the flow channel plate, and the surface of the flow channel plate facing the battery cell has the capillary structure.

[0014] In this embodiment, the surface of the flow channel plate facing the battery cell has a capillary structure. Since the flow channel plate has a protruding portion and a flow channel portion, the surface of the flow channel plate facing the battery cell is a concave-convex curved surface. In this way, the specific surface area of ​​the flow channel plate can be increased, thereby increasing the area of ​​the capillary structure and enhancing the absorption performance of condensed water.

[0015] In some embodiments, the heat exchange assembly includes a condensate collector, and a space on one side of the protrusion away from the combining plate forms a recessed space, and the condensate collector is located in at least a portion of the recessed space.

[0016] In this embodiment, the recessed space is a space formed by the protruding portion protruding toward the combining plate. Compared with the capillary structure on the flow channel portion, the capillary structure on the wall of the recessed space is relatively far away from the battery cell. The condensation water collector is arranged in the recessed space. The condensation water collector can collect condensation water from the capillary structure as well as condensation water near the battery cell.

[0017] In some embodiments, the condensed water collector is spaced apart from the battery cells.

[0018] In this embodiment, the condensed water collector does not contact the battery cell, which can prevent the battery cell from squeezing the condensed water collector to a certain extent.

[0019] In some embodiments, the condensate collector does not protrude from the recessed space.

[0020] In this embodiment, the condensate collector does not protrude from the recessed space. In other words, in the stacking direction of the heat exchange component, the depth of the recessed space is not less than the thickness of the condensate collector. Even if the capillary structure on the flow channel portion abuts against the battery cell, the condensate collector can basically be spaced apart from the battery cell, and the battery cell will basically not squeeze the condensate collector.

[0021] In some embodiments, the capillary structure has a first hole, and the condensed water collector has a second hole, and the diameter of the second hole is smaller than the diameter of the first hole.

[0022] In this embodiment, both the capillary structure and the condensation water collector have capillary force, and the aperture of the second hole is smaller than the aperture of the first hole. In this way, the capillary force of the condensation water collector is greater than the capillary force of the capillary structure. The condensation water collector can absorb the condensation water temporarily stored in the capillary structure. After the capillary structure removes at least part of the condensation water, it can further absorb the condensation water in the box.

[0023] In some embodiments, an insulating layer is disposed on a surface of the rigid member away from the flexible member.

[0024] In this embodiment, the surface of the rigid part away from the flexible part will not form a medium flow channel, the surface of the rigid part away from the flexible part is easy to contact other objects, and an insulating layer is arranged on the surface of the rigid part away from the flexible part. The insulating layer can improve the insulation performance of the rigid part and reduce the risk of the rigid part being charged.

[0025] In some embodiments, the battery device includes a breathing valve, the heat exchange component is located in the box, and the breathing valve is arranged in the box.

[0026] In this embodiment, the inside and outside of the box are connected through a breathing valve. When the pressure inside and outside the box changes, the breathing valve "breathes" to achieve pressure balance inside and outside the box, and the air inside and outside the box is exchanged. Therefore, the air inside the box has a certain humidity and is easy to carry water vapor. The heat exchange component is arranged in the box, and the surface of the heat exchange component has a capillary structure. The capillary structure can absorb condensed water in time to avoid droplet formation, thereby reducing the risk of leakage short circuit caused by the presence of droplets.

[0027] In some embodiments, the flexible member is a layered structure, and the flexible member includes a metal layer and two anti-corrosion layers, and the metal layer is stacked between the two anti-corrosion layers.

[0028] In this embodiment, the flexible part can provide plasticity through the metal layer so that the flexible part can maintain its basic shape. The metal layer is stacked between two anti-corrosion layers. The two anti-corrosion layers can encapsulate the metal layer to prevent the metal layer from contacting the heat exchange medium and corrosive substances in the environment, thereby improving the corrosion resistance of the flexible part.

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

[0030] In this embodiment, since the metal plastic film is thin and light in weight, and a medium flow channel is formed between the metal plastic film and the rigid part, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the thickness and weight of the heat exchange component as a whole can be reduced. At the same time, since the metal plastic film has the characteristics of insulation and heat exchange medium corrosion resistance, the possibility of insulation failure can be reduced, and the risk of the heat exchange component reacting with the heat exchange medium flowing inside is also reduced, further reducing the possibility of heat exchange medium corrosion leakage.

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

[0032] In this embodiment, the flexible part is made of aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, and meets insulation and corrosion protection requirements.

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

[0034] In this embodiment, the flexible member formed by stacking the metal layer and the non-metal layer in sequence is thin and light in weight, and by forming a medium flow channel between the flexible member and the rigid member, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the thickness and weight of the heat exchange component as a whole can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0035] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0036] In this embodiment, by setting the metal layer to one or more of aluminum foil, copper foil and steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer to one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member can have a certain waterproof effect and / or resistance to corrosion by heat exchange media.

[0037] In some embodiments, the non-metallic layer is a hot-melt layer.

[0038] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0039] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0040] In this embodiment, by setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while making the overall thickness of the heat exchange component smaller, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0041] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0042] In this embodiment, by setting the thickness of the flexible part to 0.08mm-0.2mm, the heat exchange component made of the flexible part has a certain structural strength, and the overall thickness of the heat exchange component is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device, so as to further increase the energy density of the battery device.

[0043] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0044] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and has a certain deformation ability, which can improve the fit between the heat exchange component and the case and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the case and / or the battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0045] In some embodiments, the rigid member is configured as a metal plate.

[0046] In this embodiment, by setting the rigid part as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component with a certain heat exchange efficiency, the rigid part can also play a certain supporting role for the flexible part.

[0047] An embodiment of the present application provides an electrical device, comprising any one of the battery devices described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the structure of a vehicle in some embodiments of the present application; Figure 2 An exploded schematic diagram of a battery device in some embodiments of the present application; Figure 3 for Figure 2 Explosion diagram of the heat exchange component; Figure 4 An exploded schematic diagram of a flexible member, a capillary structure and a condensed water collector in some embodiments of the present application; Figure 5 for Figure 4 The schematic diagram of the assembly of the flexible member, the capillary structure and the condensate collector is shown; Figure 6 for Figure 5 Schematic cross-sectional view in the AA direction; Figure 7 for Figure 5 A partial enlarged schematic diagram of the structure shown.

[0049] Description of Reference Numerals 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 21, flexible part; 22, rigid part; 23, connecting part; 2b, recessed space; 201, capillary structure; 202, condensate collector; 3, box body; 31, top cover; 32, annular frame; 33, bottom guard plate. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0052] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] It should be noted that, in the present application, at least two includes a number of two and more than two. A plurality includes a number of two and more than two.

[0055] See also Figure 1 and Figure 2 To facilitate understanding of the battery device 100 and the electrical equipment provided in the embodiment of the present application, some basic structures of the battery cell 1, the battery device 100 and the electrical equipment provided in the embodiment of the present application are first introduced.

[0056] In the embodiment of the present application, the battery cell 1 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0057] 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0058] The battery cell 1 generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0059] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0060] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0061] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0064] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0066] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0067] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0068] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0069] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0070] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface 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.

[0071] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0072] In some embodiments, the battery cell 1 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0073] The liquid electrolyte includes an electrolyte salt and a solvent.

[0074] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0075] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0076] In some embodiments, the electrolyte may further include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 1, such as additives that improve the overcharge / fast charge performance of the battery cell 1, additives that improve the high temperature performance of the battery cell 1, and additives that improve the low temperature performance of the battery cell 1.

[0077] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0078] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0079] As examples, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0080] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0081] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0082] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0083] In some embodiments, the electrode assembly is a laminate structure.

[0084] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0085] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0086] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0087] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0088] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0089] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0090] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0091] In some embodiments, the battery cell 1 may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the outer shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating structure or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0092] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in the present application.

[0093] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0094] In some embodiments, at least one pole is disposed on the housing, and the pole is electrically connected to the pole lug. The pole may be directly connected to the pole lug, or indirectly connected to the pole lug through a current collecting member. The pole may be disposed on the end cover, or on the housing.

[0095] In some embodiments, a pressure relief mechanism is provided on the housing, and is used to discharge the internal gas of the battery cell 1 .

[0096] As an example, when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, 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, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 1.

[0097] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0098] As an example, the pressure relief mechanism may also be separately provided and connected to the housing.

[0099] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 1 can be released. The action produced by the pressure relief mechanism may include but is 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 ruptures, breaks, is torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged from the actuated part as emissions. In this way, the battery cell 1 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0100] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be set as a through hole to discharge the gas inside the battery cell 1.

[0101] The emissions from the battery cell 1 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, and the like.

[0102] The battery device 100 provided in the embodiment of the present application includes the battery cell 1 in any one of the embodiments of the present application.

[0103] The battery apparatus 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 1 .

[0104] A plurality of battery cells 1 can be connected in series, in parallel or in mixed series via a busbar component. The busbar component is used to realize electrical connection between at least two battery cells 1 .

[0105] For example, hybrid connection means that at least two battery cells 1 are both connected in series and in parallel. At least two battery cells 1 can be directly connected in series, in parallel, or in hybrid connection; of course, at least two battery cells 1 can be first connected in series, in parallel, or in hybrid connection to form a module, and the module can then be connected in series, in parallel, or in hybrid connection to form a whole.

[0106] In some embodiments, a battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 1 .

[0107] As an example, the battery cell assembly may 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 may be formed by bundling a plurality of battery cells 1 by a cable tie.

[0108] In some embodiments, the battery device 100 may be a battery pack.

[0109] The battery device 100 may include a box body 3 . As an example, the battery cell assembly may be a battery module. The battery cell assembly may be accommodated in the box body 3 by fixing the battery module in the box body 3 .

[0110] As an example, the battery cell assembly may also be accommodated in the box body 3 by directly fixing the plurality of battery cells 1 to the box body 3 .

[0111] In some embodiments, the box 3 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 3 can become at least a part of the floor of the vehicle 1000, or part of the box 3 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0112] An embodiment of the present application provides an electric device, which includes a battery device 100 in any one of the embodiments of the present application, and the battery device 100 is used to store or provide electric energy.

[0113] The electrical equipment includes but is not limited to energy storage devices, mobile phones, tablets, laptops, electric toys, electric tools, vehicles 1000, ships or spacecraft, etc. Among them, the vehicle 1000 may include battery vehicles and electric cars, the electric toys may include battery vehicle toys and electric car toys, etc., fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and the spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0114] Energy storage devices include but are not limited to energy storage containers or energy storage cabinets, etc.

[0115] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0116] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom of the vehicle 1000 or at the front or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0117] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0118] In the related art, during the operation of the battery device, the temperature of the battery cells generally rises, and the heat exchange component absorbs the heat of the battery cells, that is, provides a cooling function. Condensation water is inevitably generated during the cooling process. The presence of condensation water will bring certain safety hazards to the battery cells. For example, the presence of condensation water may cause leakage and short circuit between the battery cells, which may easily cause a fire risk.

[0119] In view of this, an embodiment of the present application provides a battery device, which includes a box, at least two battery cells and a heat exchange assembly. At least two battery cells are located in the box. The heat exchange assembly is arranged on one side of the battery cell, and the heat exchange assembly includes at least two heat exchange parts, at least one heat exchange part is arranged as a flexible part, and at least one heat exchange part is arranged as a rigid part. The flexible part and the rigid part are stacked to form a medium flow channel, and 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. Among them, the surface of the heat exchange assembly has a capillary structure.

[0120] 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 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. The capillary structure can absorb condensed water through capillary force, so that the condensed water can be dispersed in the capillary structure, which can reduce the aggregation and flow of condensed water and reduce the risk of condensed water agglomerating into droplets.

[0121] 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 7An embodiment of the present application provides a battery device 100 , which includes a box body 3 , at least two battery cells 1 and a heat exchange component 2 .

[0122] At least two battery cells 1 are located in the box 3. The heat exchange assembly 2 is arranged on one side of the battery cell 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. The medium flow channel 2a is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1. The surface of the heat exchange assembly 2 has a capillary structure 201.

[0123] The box body 3 can be used to contain the battery cell 1 and other structural parts, provide protection for the battery cell 1 and other structural parts, and reduce the impact of foreign matter outside the box body 3 on the charging or discharging of the battery cell 1.

[0124] 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.

[0125] The rigidity in the rigid part 22 refers to the material property of the structure. This type of property can be a property given to the material due to its heavy mass, 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 rigid part 22 can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a material of a structure such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part 22. The embodiment of the present application can support the flexible part 21 by configuring the heat exchange component 2 to include the rigid part 22, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2.

[0126] After the rigid part 22 is manufactured and formed, that is, after plastic deformation is completed, it can basically maintain its shape without change under normal use. After the flexible part 21 is manufactured and formed, that is, after plastic deformation is completed, it can undergo elastic deformation, that is, change its shape under normal use.

[0127] By configuring the heat exchange component 2 to include the flexible component 21 and the rigid component 22 , the heat exchange component 2 can have a flexible function and also have a certain structural strength.

[0128] 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.

[0129] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can have 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 described as a cooling liquid.

[0130] It should be noted that the specific number of the medium flow channels 2a is not limited here, and can be one or more.

[0131] The heat exchange assembly 2 includes at least two heat exchange elements, that is, the number of the heat exchange elements is multiple.

[0132] At least one heat exchange component is configured as a flexible component 21, which means that the number of the flexible components 21 is one or more. In the embodiment where multiple heat exchange components are configured as flexible components 21, the flexible components 21 may be the same or different.

[0133] At least one heat exchange component is configured as a rigid component 22, which means that the number of the rigid components 22 is one or more. In the embodiment where multiple heat exchange components are configured as rigid components 22, the rigid components 22 may be the same or different.

[0134] Exemplarily, the heat exchange assembly 2 includes two heat exchange components, one of which is a flexible component 21 and the other is a rigid component 22 .

[0135] Exemplarily, the rigid component 22 is a rigid layered structure, which can support the flexible component 21 , thereby facilitating improving the overall structural strength and stability of the heat exchange assembly 2 .

[0136] The capillary structure 201 is disposed on the surface of the heat exchange component 2 , and the capillary structure 201 may be disposed on the surface of the rigid component 22 , or may be disposed on the surface of the flexible component 21 .

[0137] The capillary structure 201 is a structure capable of generating a capillary force to drive the liquid to flow. For example, the capillary structure 201 may have a plurality of first holes. The size of the first holes is in the micrometer level, for example, the pore size of the first holes is not greater than 1 mm. Preferably, the pore size of the first holes is between 1 μm and 100 μm. The basic principle is to achieve the spontaneous flow of the liquid through the synergistic effect of the surface tension of the liquid and the first holes of the capillary structure 201.

[0138] It should be noted that the unit "mm" means millimeter, and the unit "μm" means millimeter.

[0139] The capillary structure 201 can absorb condensed water, which is liquid formed by condensation of water vapor in the housing 3 , thus reducing the risk of water vapor agglomerating into liquid droplets.

[0140] The pore diameter of the first pores may be measured by a gas adsorption method and / or a mercury intrusion method.

[0141] The principle of the mercury injection method is to use high-pressure mercury to invade the pores and calculate the pore size distribution by the amount of intrusion. For details, please refer to "GB / T 21650.1-2008 Determination of pore size distribution and porosity of solid materials by mercury injection and gas adsorption method".

[0142] The principle of gas adsorption method is to analyze pore size based on gas adsorption isotherms (such as BET method). For details, please refer to "GB / T19587-2017 Determination of specific surface area of ​​solid substances by gas adsorption BET method" and "GB / T 21650.2-2008 Analysis of mesopores and macropores by gas adsorption method".

[0143] In the battery device 100 provided in 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 part 21 and a rigid part 22, the weight of the flexible part 21 is relatively light, which is conducive to reducing the weight of the heat exchange component 2, reducing the production cost of the heat exchange component 2, and reducing the weight of the battery device 100. The flexible part 21 and the rigid part 22 are stacked to form at least one medium flow channel 2a. The rigid part 22 can support the flexible part 21, which is conducive 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 capillary structure 201 can absorb condensed water through capillary force, so that the condensed water can be dispersed in the capillary structure 201, which can reduce the aggregation and flow of condensed water and reduce the risk of condensed water gathering into droplets.

[0144] The shape of the box 3 is not limited. For example, the box 3 can be a simple three-dimensional structure such as a single hexahedron, a cylinder, or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as hexahedrons, cylinders, or spheres. In one example, the box 3 can be a rectangular parallelepiped, and the length and width directions of the box 3 are parallel to the horizontal plane, and the length direction of the box 3 is parallel to the longest side of the rectangular parallelepiped.

[0145] The material of the box body 3 is not limited. For example, the material of the box body 3 can be a metal material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0146] For some examples, see Figure 2 and Figure 3 The box body 3 includes an annular frame 32, a top cover 31 and a bottom guard plate 33. The annular frame 32 has a top opening and a bottom opening. The top cover 31 closes the top opening of the annular frame 32. The bottom guard plate 33 closes the bottom opening of the annular frame 32. The top cover 31, the annular frame 32 and the bottom guard plate 33 together define a receiving cavity. At least two battery cells 1 and the heat exchange assembly 2 are located in the receiving cavity. Specifically, the capillary structure 201 is also located in the receiving cavity.

[0147] The annular frame 32 may be substantially in the shape of a square ring, a rectangular ring or other ring shapes. In some embodiments, the annular frame 32 may include four side plates, which may be extruded plate-shaped profiles, and the four side plates are sequentially welded along the circumference to form the annular frame 32 .

[0148] The accommodating cavity may be a sealed space or a non-sealed space.

[0149] The top cover 31 may be welded to the annular frame 32 or connected to the annular frame 32 by fasteners.

[0150] The bottom guard plate 33 can be welded to the annular frame 32 or connected by fasteners. Exemplarily, the heat exchange component 2 also includes an inlet and an outlet, and the inlet and the outlet are both connected to the medium flow channel 2a. Here, the inlet and the outlet of the heat exchange component 2 are used to connect with the pipeline of the air conditioning system or water tank of the whole vehicle or electrical device.

[0151] For example, see Figure 3 The heat exchange component 2 also includes a connecting member 23 having an inlet and a connecting member 23 having an outlet, and the connecting member 23 is connected to the rigid member 22.

[0152] For example, the connection member 23 is connected to the rigid member 22 by soldering.

[0153] Exemplarily, the connection member 23 is, for example, a faucet.

[0154] The principle of heat exchange of the heat exchange component 2 for the battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 2a through the inlet of the heat exchange component 2, and after the heat exchange medium exchanges heat with the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heat exchange of the battery cell 1.

[0155] Here, the heat exchange component 2 performs heat exchange on the battery cell 1 to dissipate heat from the battery cell 1 or to heat the battery cell 1 .

[0156] The principle of heat exchange component 2 to dissipate heat for 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 by the battery cell 1 during operation, the heat exchange medium flows out through the outlet of the heat exchange component 2 to release the heat, thereby completing the cooling and heat dissipation of the battery cell 1.

[0157] 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, and the heat exchange medium transfers heat to the battery cell 1. After heating the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heating of the battery cell 1.

[0158] In some embodiments, the surface of the heat exchange component 2 facing the battery cell 1 has a capillary structure 201 .

[0159] The surface of the heat exchange component 2 facing the battery cell 1 is the surface of the heat exchange component 2 closest to the battery cell 1. For example, in the embodiment where the rigid part 22 faces the battery cell 1, the surface of the rigid part 22 facing the battery cell 1 has the capillary structure 201; in the embodiment where the flexible part 21 faces the battery cell 1, the surface of the flexible part 21 facing the battery cell 1 has the capillary structure 201.

[0160] In this embodiment, the temperature difference between the surface of the heat exchange component 2 facing the battery cell 1 and the battery cell 1 is large, and condensation is prone to occur. A capillary structure 201 is provided on the surface of the heat exchange component 2 facing the battery cell 1, which is conducive to the capillary structure 201 absorbing water vapor as quickly as possible and reducing the risk of water vapor condensing into droplets and contacting the battery cell 1.

[0161] For some examples, see Figures 2 to 7 The rigid member 22 is disposed on a side of the flexible member 21 away from the battery cell 1 , and a surface of the flexible member 21 facing the battery cell 1 has a capillary structure 201 .

[0162] As an example, the capillary structure 201 may abut against the surface of the battery cell 1 , that is, the flexible member 21 may press against the battery cell 1 , and the flexible member 21 may generate elastic deformation so as to press the capillary structure 201 against the surface of the battery cell 1 .

[0163] In this embodiment, the flexible member 21 has a certain flexibility and can better fit the battery cell 1, which is conducive to absorbing the assembly tolerance of the heat exchange component 2, improving the fit between the heat exchange component 2 and the battery cell 1, and increasing the effective heat exchange area between the heat exchange component 2 and the battery cell 1, thereby improving the heat exchange effect of the heat exchange component 2. The surface of the flexible member 21 facing the battery cell 1 has a capillary structure 201, so that the capillary structure 201 can absorb the condensed water on the surface of the battery cell 1 in time, reducing the risk of condensed water gathering on the surface of the battery cell 1.

[0164] In some embodiments, the flexible member 21 is disposed on the side of the rigid member 22 away from the battery cell 1, and the surface of the rigid member 22 facing the battery cell 1 has a capillary structure 201. With such a design, the rigid member 22 can have good thermal conductivity and support capacity, and the rigid member 22 can stably support the capillary structure 201, and has a good thermal conductivity effect.

[0165] In some embodiments, the capillary structure 201 is connected to the surface of the heat exchange component 2 .

[0166] In some embodiments, the capillary structure 201 is connected to the surface of the heat exchange component 2 facing the battery cell 1 .

[0167] As an example, the capillary structure 201 may be bonded to the surface of the heat exchange component 2. The bonding method includes but is not limited to glue or double-sided tape.

[0168] The capillary structure 201 may also be connected to the surface of the heat exchange component 2 by heat pressing, welding or other methods.

[0169] In this embodiment, the capillary structure 201 and the heat exchange component 2 can be manufactured separately and independently, and then connected together, which can reduce the difficulty of manufacturing the capillary structure 201 and the heat exchange component 2. In some embodiments, the surface of the heat exchange component 2 is treated to form a capillary structure 201 .

[0170] In some embodiments, the surface of the heat exchange component 2 facing the battery cell 1 is surface treated to form a capillary structure 201 .

[0171] Surface treatment refers to the process of changing the surface properties of a material by physical or chemical means.

[0172] In some examples, chemical etching is performed on the surface of the rigid member 22 or the flexible member 21 to form the capillary structure 201 .

[0173] In some examples, a coating is deposited on the surface of the rigid member 22 or the flexible member 21 to form the capillary structure 201 .

[0174] In this embodiment, the surface of the heat exchange component 2 facing the battery cell 1 is surface treated to form a capillary structure 201. The capillary structure 201 can be attached to the surface of the heat exchange component 2 facing the battery cell 1 through atomic or intermolecular forces, thereby eliminating the assembly process between the capillary structure 201 and the heat exchange component 2.

[0175] In the related art, when a battery cell is in use, the pole of the battery cell faces the top side, and the temperature of the part of the battery cell near the pole is higher than that of other parts. For some examples, see Figure 2 and Figure 3 The heat exchange component 2 is arranged on the top side X1 of the battery cell 1 , the capillary structure 201 faces the bottom side, and the pole of the battery cell 1 faces the capillary structure 201 .

[0176] As an example, the heat exchange assembly 2 may be located on the top side X1 of one or more battery cells 1. For example, the heat exchange assembly 2 is located on the top side X1 of all battery cells 1 in the battery device 100.

[0177] It should be noted that the top side X1 and the bottom side X2 are two opposite sides of the top-bottom direction X, and usually the bottom side X2 faces the ground, and the top side X1 faces the sky.

[0178] In this embodiment, since the pole is located at the top of the battery cell 1, the temperature gradient on the top side X1 of the battery cell 1 is large, and the fluid fluidity on the top of the battery cell 1 is relatively poor, water vapor is easily condensed on the top side X1 of the battery cell 1 to form condensed water. The heat exchange component 2 is arranged on the top side X1 of the battery cell 1, and the capillary structure 201 faces the bottom side, that is, the capillary structure 201 faces the pole, which can absorb water vapor in the airflow in time and reduce the risk of water vapor condensing into condensed water.

[0179] In some embodiments, the heat exchange assembly 2 is disposed on one side of the battery cell 1 along a first direction, and the first direction is perpendicular to the top-bottom direction X.

[0180] Taking the square shell battery cell 1 as an example, the first direction can be perpendicular to the large surface of the shell. In this way, the heat exchange component 2 can contact the large surface of the battery cell 1, and the heat exchange area is larger. Of course, the first direction can also be parallel to the large surface of the shell, so that the heat exchange component 2 can be set on the side where the shell is connected to the large surface.

[0181] In this embodiment, the box body 3 usually reserves space in the first direction, which easily causes air retention, which easily causes water vapor to accumulate on the side of the battery cell 1 along the first direction to produce condensed water. The heat exchange component 2 is arranged on one side of the battery cell 1 along the first direction, and can promptly absorb the condensed water accumulated on the side of the battery cell 1 along the first direction.

[0182] In some embodiments, a plurality of heat exchange assemblies 2 may be arranged at intervals along the first direction, and a plurality of battery cells 1 may be disposed between any two adjacent heat exchange assemblies 2. There may be two or more heat exchange assemblies 2.

[0183] In some embodiments, the heat exchange component 2 includes a connecting plate and a flow channel plate, the flow channel plate has a protrusion and a flow channel portion, the protrusion protrudes toward the connecting plate to connect the connecting plate, the flow channel portion is spaced from the connecting plate to form a medium flow channel 2a, one of the flexible part 21 and the rigid part 22 is the connecting plate, and the other of the flexible part 21 and the rigid part 22 is the flow channel plate, and the surface of the flow channel plate facing the battery cell 1 has a capillary structure 201.

[0184] Both the combining plate and the flow channel plate are in a layered structure. The layered structure refers to a structure in which one or more layers are spread out in a plane or curved form, and the multiple layers can be parallel to each other or regularly stacked.

[0185] The combined plate may be in a flat plate structure, which means that the two surfaces of the plate body along the stacking direction are substantially flat. Of course, the combined plate may not be in a flat plate structure.

[0186] One of the flexible part 21 and the rigid part 22 is a combining plate, and the other one of the flexible part 21 and the rigid part 22 is a flow channel plate, which means that if the flexible part 21 is a combining plate, the rigid part 22 is a flow channel plate; if the rigid part 22 is a combining plate, the flexible part 21 is a flow channel plate.

[0187] As an example, the flexible member 21 is a combination plate, the rigid member 22 is a flow channel plate, the rigid member 22 has a protrusion and a flow channel portion, the protrusion protrudes toward the flexible member 21 and connects the flexible member 21, and the interval space between the flow channel portion and the flexible member 21 is a medium flow channel 2a. Here, the rigid member 22 can be formed with the protrusion and the flow channel portion by a stamping process.

[0188] As an example, the rigid member 22 is a combination plate, the flexible member 21 is a flow channel plate, the flexible member 21 has a protrusion and a flow channel, the protrusion protrudes toward the rigid member 22 and connects the rigid member 22, and the interval space between the flow channel and the rigid member 22 is the medium flow channel 2a. Here, the flexible member 21 can be formed with the protrusion and the flow channel by a hot pressing process.

[0189] The surface of the flow channel plate facing the battery cell 1 has a capillary structure 201. For example, the surface of the rigid plate facing the battery cell 1 may have a capillary structure 201, or the surface of the flexible member 21 facing the battery cell 1 may have a capillary structure 201. The capillary structure 201 may cover the entire surface of the flow channel plate facing the battery cell 1.

[0190] In this embodiment, the surface of the flow channel plate facing the battery cell 1 has a capillary structure 201. Since the flow channel plate has a protruding portion and a flow channel portion, the surface of the flow channel plate facing the battery cell 1 is a concave-convex curved surface. In this way, the specific surface area of ​​the flow channel plate can be increased, thereby increasing the area of ​​the capillary structure 201 and enhancing the absorption performance of condensed water.

[0191] For some examples, see Figures 4 to 7 The heat exchange component 2 includes a condensate collector 202, and a space on one side of the protrusion away from the combining plate forms a recessed space 2b, and at least part of the recessed space 2b has the condensate collector 202.

[0192] The condensation water collector 202 can provide a condensation water collection function. The condensation water collector 202 can be a structure that can generate capillary force to drive the liquid to flow.

[0193] The condensate collector 202 may have a plurality of second holes. The size of the second holes is in the micrometer level, for example, the pore size of the second holes is less than 1 mm. Preferably, the pore size of the second holes is between 1 μm and 100 μm. The basic principle is to achieve the spontaneous flow of liquid through the synergistic effect of the surface tension of the liquid and the second holes.

[0194] The pore size of the second hole can be measured by gas adsorption method and / or mercury intrusion method. The gas adsorption method and mercury intrusion method can be referred to the above content and will not be described in detail here.

[0195] At least part of the recessed space 2b has the condensation water collector 202, which means that part of the recessed space 2b may have the condensation water collector 202, while another part of the recessed space 2b does not have the condensation water collector 202; or all of the recessed space 2b may have the condensation water collector 202.

[0196] In this embodiment, the recessed space 2b is a space formed by the protruding portion protruding toward the combining plate. Compared with the capillary structure 201 on the flow channel portion, the capillary structure 201 on the wall of the recessed space 2b is relatively far away from the battery cell 1. The condensation water collector 202 is arranged in the recessed space 2b. The condensation water collector 202 can collect condensation water from the capillary structure 201 and condensation water near the battery cell 1.

[0197] In some embodiments, the condensed water collector 202 is spaced apart from the battery cell 1 .

[0198] In this embodiment, the condensed water collector 202 is not in contact with the battery cell 1 , which can prevent the battery cell 1 from squeezing the condensed water collector 202 to a certain extent.

[0199] For some examples, see Figure 6 and Figure 7, the condensate collector 202 does not protrude from the recessed space 2b.

[0200] As an example, in the stacking direction of the heat exchange assembly 2, the depth of the recessed space 2b is not less than the thickness of the condensate collector 202. The depth of the recessed space 2b refers to the dimension of the recessed space 2b along the stacking direction, and the thickness of the condensate collector 202 refers to the dimension of the condensate collector 202 along the stacking direction. If the depth of the recessed space 2b is greater than the thickness of the condensate collector 202, the condensate collector 202 is entirely located within the recessed space 2b. If the depth of the recessed space 2b is equal to the thickness of the condensate collector 202, the surface of the condensate collector 202 facing the battery cell 1 is flush with the plane where the opening of the recessed space 2b is located.

[0201] In this embodiment, the condensate collector 202 does not protrude from the recessed space 2b. In other words, in the stacking direction of the heat exchange component 2, the depth of the recessed space 2b is not less than the thickness of the condensate collector 202. Even if the capillary structure 201 on the flow channel portion abuts against the battery cell 1, the condensate collector 202 can basically be spaced apart from the battery cell 1, and the battery cell 1 basically does not squeeze the condensate collector 202.

[0202] In some embodiments, the capillary structure 201 has a first hole, and the condensed water collector 202 has a second hole, and the diameter of the second hole is smaller than the diameter of the first hole.

[0203] The first hole and the second hole can be as described above and will not be described again here.

[0204] In this embodiment, the capillary structure 201 and the condensation water collector 202 both have capillary force, and the aperture of the second hole is smaller than the aperture of the first hole. In this way, the capillary force of the condensation water collector 202 is greater than the capillary force of the capillary structure 201. The condensation water collector 202 can absorb the condensation water temporarily stored in the capillary structure 201. After the capillary structure 201 removes at least part of the condensation water, it can further absorb the condensation water in the box body 3.

[0205] In some embodiments, an insulating layer is disposed on a surface of the rigid member 22 away from the flexible member 21 .

[0206] The insulating layer is a layered structure that provides insulation function.

[0207] In this embodiment, the surface of the rigid part 22 away from the flexible part 21 will not form a medium flow channel 2a, the surface of the rigid part 22 away from the flexible part 21 is easy to contact other objects, and an insulating layer is provided on the surface of the rigid part 22 away from the flexible part 21. The insulating layer can improve the insulation performance of the rigid part 22 and reduce the risk of the rigid part 22 being charged.

[0208] In some embodiments, the battery device 100 includes a breathing valve, the heat exchange component 2 is located in the box body 3, and the breathing valve is disposed in the box body 3.

[0209] The breathing valve is used to achieve air pressure balance inside and outside the box 3, that is, the air outside the box 3 can enter the box 3 through the breathing valve, and the air inside the box 3 can also be discharged to the outside of the box 3 through the breathing valve.

[0210] In this embodiment, the inside and outside of the box 3 are connected through a breathing valve. When the pressure inside and outside the box 3 changes, the breathing valve "breathes" to achieve pressure balance inside and outside the box 3, and the air inside and outside the box 3 is exchanged. Therefore, the air in the box 3 has a certain humidity and is easy to carry water vapor. The heat exchange component 2 is arranged in the box 3, and the surface of the heat exchange component 2 has a capillary structure 201. The capillary structure 201 can absorb condensed water in time to avoid droplet formation, thereby reducing the risk of leakage short circuit caused by the presence of droplets.

[0211] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer and two anti-corrosion layers, and the metal layer is stacked between the two anti-corrosion layers.

[0212] The metal layer is a structure formed by spreading metal materials.

[0213] The anti-corrosion layer is a structure with anti-corrosion function.

[0214] It is understandable that the two anti-corrosion layers can be made of the same material or different materials.

[0215] In this embodiment, the flexible part 21 can provide plasticity through the metal layer so that the flexible part 21 can maintain its basic shape. The metal layer is stacked between two anti-corrosion layers. The two anti-corrosion layers can encapsulate the metal layer to prevent the metal layer from contacting the heat exchange medium and corrosive substances in the environment, thereby improving the corrosion resistance of the flexible part 21.

[0216] In some embodiments, the flexible member 21 and the rigid member 22 are hot pressed to form a hot pressing area and a medium flow channel 2 a , and the flexible member 21 and the rigid member 22 are connected to each other in at least a portion of the hot pressing area.

[0217] Here, the protruding portion is at least a part of the hot pressing area, and the flow channel portion forms the medium flow channel 2a.

[0218] That is to say, the flexible member 21 and the rigid member 22 are connected by hot pressing, and the hot pressing area and the medium flow channel 2a are formed by hot pressing. This molding method is simple.

[0219] Here, the flexible member 21 is sealed by a hot pressing process, which can effectively ensure that the heat exchange component 2 has good sealing performance and is not prone to cracking.

[0220] In this embodiment, the flexible member 21 is sealed by a hot pressing process, that is, a hot pressing area is formed by hot pressing, and the hot pressing area separates the heat exchange component 2 to form at least one medium flow channel 2a. This molding method is simple.

[0221] Exemplarily, the heat-pressing area includes a heat-sealing area and a non-heat-sealing area, and the non-heat-sealing area and the medium flow channel 2a are respectively located on both sides of the heat-sealing area, which is conducive to reducing the width of the heat-sealing area, improving the problem of excessive temperature caused by the heat-sealing area being too wide, affecting the heat-pressing quality and damaging the flexible member 21. In addition, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 21 is folded, improving the situation where stress concentration occurs in the heat-sealing area and causes damage to the heat-sealing area.

[0222] In the related art, the heat exchange component is formed by welding two pieces of high-strength aluminum alloy. However, since high-strength aluminum alloy (5 series, 6 series, etc.) has a high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0223] In the embodiment of the present application, the heat exchange component 2 is configured to include a flexible part 21 and a rigid part 22, and the flexible part 21 and the rigid part 22 are hot pressed to form a hot pressing 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 improve the structural strength of the heat exchange component 2.

[0224] In some embodiments, the flexible member 21 is a single-layer or multi-layer film.

[0225] In some embodiments, the flexible member 21 includes a metal plastic film.

[0226] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0227] In this embodiment, since the metal plastic film is thin and light in weight, and the medium flow channel 2a is formed between the metal plastic film and the rigid member 22, it is not affected by the extrusion process and does not need to meet the large thickness requirement, so the overall thickness and weight of the heat exchange component 2 can be reduced. At the same time, since the metal plastic film has the characteristics of insulation and heat exchange medium corrosion resistance, the possibility of insulation failure can be reduced, and the risk of the heat exchange component 2 reacting with the heat exchange medium flowing inside is also reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0228] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0229] In this embodiment, the flexible member 21 is made of aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, and meets insulation and corrosion protection requirements.

[0230] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0231] Here, the flexible member 21 includes a metal layer and a non-metal layer, that is, a composite material member composed of a metal layer and a non-metal layer.

[0232] Exemplarily, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0233] Here, the number of metal layers and non-metal layers is not limited.

[0234] In this embodiment, the flexible member 21, which is formed by stacking metal layers and non-metal layers in sequence, is thin and light in weight, and by forming a medium flow channel 2a between the flexible member 21 and the rigid member 22, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component 2 can be reduced. In addition, the heat exchange component 2 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0235] In some embodiments, the flexible member 21 is a layered structure, and the flexible member 21 includes a metal layer and a non-metal layer, which are stacked in sequence, wherein the non-metal layer is arranged on the side of the metal layer facing the rigid member 22 .

[0236] That is, the non-metal layer is located between the metal layer and the rigid member 22 .

[0237] Here, by arranging the non-metallic layer on the side of the metal layer facing the rigid part 22 , the non-metallic layer can be connected to the rigid part 22 through hot pressing.

[0238] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil.

[0239] In this embodiment, by setting the metal layer to 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.

[0240] In some embodiments, the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0241] In this embodiment, by setting the non-metallic layer to one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 21 can have a certain waterproof effect and / or resistance to corrosion by heat exchange media.

[0242] Exemplarily, a non-metallic layer of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, an additive may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0243] In some embodiments, the non-metallic layer is a hot-melt layer.

[0244] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0245] In some embodiments, the thickness of the flexible member 21 is 0.05 mm-0.3 mm.

[0246] Exemplarily, the thickness of the flexible member 21 is 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, and 0.3 mm, or any value between any two of them.

[0247] In this embodiment, by setting the thickness of the flexible part 21 to 0.05mm-0.3mm, the heat exchange component 2 made of the flexible part 21 has a certain structural strength while making the overall thickness of the heat exchange component 2 smaller, 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.

[0248] In some embodiments, the thickness of the flexible member 21 is 0.08 mm-0.2 mm.

[0249] Exemplarily, the thickness of the flexible member 21 is 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, and 0.2 mm, or any value between any two of them.

[0250] In this embodiment, by setting the thickness of the flexible part 21 to 0.08mm-0.2mm, the heat exchange component 2 made of the flexible part 21 has a certain structural strength, and the overall thickness of the heat exchange component 2 is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0251] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa-10000 MPa.

[0252] Exemplarily, the elastic modulus of the flexible member 21 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0253] In this embodiment, by setting the elastic modulus of the flexible part 21 to 0.1MPa-10000MPa, the flexible part 21 has a certain structural strength, thereby improving the reliability of the heat exchange component 2, and has a certain deformation ability, which can improve the fit between the heat exchange component 2 and the box body 3 and / or the battery cell 1, thereby increasing the effective heat exchange area between the heat exchange component 2 and the box body 3 and / or the battery cell 1, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 2.

[0254] In some embodiments, the rigid member 22 is configured as a metal plate.

[0255] By way of example, it may be an aluminum alloy.

[0256] In this embodiment, by setting the rigid part 22 as a metal plate, the metal plate has both good structural strength and good thermal conductivity. That is to say, while satisfying the heat exchange component 2 with a certain heat exchange efficiency, the rigid part 22 can also play a certain supporting role for the flexible part 21.

[0257] In some embodiments, the medium flow channel 2 a includes a plurality of sub-flow channels, each battery cell 1 corresponds to a plurality of sub-flow channels, and an extension direction of the sub-flow channels corresponding to the battery cell 1 is perpendicular to a length direction of the battery cell 1 .

[0258] A plurality of sub-flow channels are connected to form a medium flow channel 2a.

[0259] The extension direction of the sub-channels is perpendicular to the length direction of the battery cell 1 , that is, the multiple sub-channels are arranged along the length direction of the battery cell 1 , so that the length direction of the battery cell 1 corresponds to the multiple sub-channels.

[0260] It can be understood that the temperature of the heat exchange medium will gradually increase along the flow direction of the heat exchange medium. Therefore, by corresponding each battery cell 1 to multiple sub-flow channels, it is helpful to improve the uniformity of the temperature of the battery cell 1.

[0261] The battery device 100 provided in the present application is further described below with reference to a specific embodiment. Figures 2 to 7 The battery device 100 provided in the embodiment of the present application includes a box body 3, at least two battery cells 1 and a heat exchange assembly 2, at least two battery cells 1 are located in the box body 3; the heat exchange assembly 2 is arranged on one side of the battery cell 1, and the heat exchange assembly 2 includes at least two heat exchange components, at least one heat exchange component is configured as a flexible component 21, and at least one heat exchange component is configured as a rigid component 22, the flexible component 21 and the rigid component 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 at least two battery cells 1.

[0262] The rigid part 22 is arranged on the side of the flexible part 21 away from the battery cell 1. The flexible part 21 is a flow channel plate. The surface of the flow channel plate facing the battery cell 1 has a capillary structure 201. The flow channel plate has a protrusion and a flow channel. The space on one side of the protrusion away from the combining plate forms a recessed space 2b, and at least part of the recessed space 2b has a condensation water collector 202.

[0263] In this embodiment, the heat exchange assembly 2 is used to exchange heat with the battery cell 1. By setting the heat exchange assembly 2 to include a flexible member 21 and a rigid member 22, the weight of the flexible member 21 is relatively light, which is conducive to reducing the weight of the heat exchange assembly 2, reducing the production cost of the heat exchange assembly 2, and reducing the weight of the battery device 100. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is conducive to improving the overall structural strength and stability of the heat exchange assembly 2 and improving the applicability of the heat exchange assembly 2. The flexible member 21 has a certain flexibility and can better fit the battery cell 1, so as to absorb the assembly tolerance of the heat exchange assembly 2, improve the fit between the heat exchange assembly 2 and the battery cell 1, increase the effective heat exchange area between the heat exchange assembly 2 and the battery cell 1, and thus improve the heat exchange effect of the heat exchange assembly 2. The surface of the flexible member 21 facing the battery cell 1 has a capillary structure 201, so that the capillary structure 201 can absorb the condensed water on the surface of the battery cell 1 in time, reducing the risk of condensed water gathering on the surface of the battery cell 1. The recessed space 2b is a space formed by the protruding portion protruding toward the combining plate. Compared with the capillary structure 201 on the flow channel portion, the capillary structure 201 on the wall of the recessed space 2b is relatively far away from the battery cell 1. The condensation water collector 202 is arranged in the recessed space 2b. The condensation water collector 202 can collect condensation water from the capillary structure 201 and condensation water near the battery cell 1.

[0264] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. 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: include: Box; At least two battery cells are located in the box; a heat exchange assembly, arranged on one side of the battery cell, the heat exchange assembly comprising at least two heat exchange members, at least one of which is a flexible member, and at least one of which is 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; Wherein, the surface of the heat exchange component has a capillary structure.

2. The battery device according to claim 1, characterized in that: The rigid member is arranged on a side of the flexible member away from the battery cell, and a surface of the flexible member facing the battery cell has the capillary structure.

3. The battery device according to claim 1, characterized in that: The capillary structure is connected to the surface of the heat exchange component, or the surface of the heat exchange component is treated to form the capillary structure.

4. The battery device according to claim 1, characterized in that: The heat exchange component is arranged on the top side of the battery cell, the capillary structure faces the bottom side, and the pole of the battery cell faces the capillary structure; or, The heat exchange assembly is disposed on one side of the battery cell along a first direction, and the first direction is perpendicular to the top-bottom direction.

5. The battery device according to claim 1, characterized in that: The heat exchange component includes a combining plate and a flow channel plate, the flow channel plate has a protrusion and a flow channel portion, the protrusion protrudes toward the combining plate to connect the combining plate, the flow channel portion is spaced from the combining plate to form the medium flow channel, one of the flexible part and the rigid part is the combining plate, the other of the flexible part and the rigid part is the flow channel plate, and the surface of the flow channel plate facing the battery cell has the capillary structure.

6. The battery device according to claim 5, characterized in that: The heat exchange component comprises a condensed water collector, a space on one side of the protrusion away from the combining plate forms a recessed space, and at least a portion of the recessed space contains the condensed water collector.

7. The battery device according to claim 6, characterized in that: The condensed water collector is spaced apart from the battery cell.

8. The battery device according to claim 6, characterized in that: The condensed water collector does not protrude from the recessed space.

9. The battery device according to claim 6, characterized in that: The capillary structure has a first hole, and the condensed water collector has a second hole, wherein the diameter of the second hole is smaller than the diameter of the first hole.

10. The battery device according to claim 1, characterized in that: An insulating layer is disposed on a surface of the rigid component away from the flexible component.

11. The battery device according to claim 1, characterized in that: The battery device comprises a breathing valve, the heat exchange component is located in the box, and the breathing valve is arranged in the box.

12. The battery device according to any one of claims 1 to 11, characterized in that: The flexible member is a layered structure, comprising a metal layer and two anti-corrosion layers, wherein the metal layer is stacked between the two anti-corrosion layers.

13. The battery device according to any one of claims 1 to 11, characterized in that: The flexible member includes a metal plasticized film.

14. The battery device according to claim 13, characterized in that: The flexible member comprises an aluminum-plastic film.

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

16. The battery device according to claim 15, characterized in that: The metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

17. The battery device according to claim 15, characterized in that: The non-metallic layer is a hot-melt layer.

18. The battery device according to any one of claims 1 to 11, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

19. The battery device according to claim 18, characterized in that: The thickness of the flexible member is 0.08 mm-0.2 mm.

20. The battery device according to any one of claims 1 to 11, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

21. The battery device according to any one of claims 1 to 11, characterized in that: The rigid member is configured as a metal plate.

22. An electrical equipment, characterized in that: A battery device comprising any one of claims 1 to 21.

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