Battery device and electrical equipment

Abstract

The present application relates to the field of battery technology and provides a battery device and electrical equipment. The battery device includes a housing, at least two battery cells, and a heat exchange assembly. The at least two battery cells are located in the housing. The heat exchange assembly is disposed on one side of the battery cell. The heat exchange assembly includes at least two heat exchange members, at least one of which is configured as a flexible member and at least one of which is configured as a rigid member. The flexible and rigid members are stacked to form a medium flow channel. The medium flow channel is used to conduct a heat exchange medium, which is used to exchange heat with the at least two battery cells. The surface of the heat exchange assembly has a capillary structure. The capillary structure can absorb condensed water through capillary force, allowing the condensed water to be dispersed within the capillary structure, thereby reducing the aggregation and flow of the condensed water and reducing the risk of the condensed water agglomerating into droplets.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. 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 related technologies, for example, in vehicles equipped with battery devices, the battery devices can be used to provide full or partial power. During use, the temperature of the battery cells within the battery device rises, requiring temperature control. Failure to do so can adversely affect the performance and service life of the battery device. Therefore, how to regulate the temperature of the battery cells through heat exchange components while reducing condensation within the battery device housing has become an important research topic in this field. Summary of the Invention

[0004] In view of this, embodiments of the present application hope to provide a battery device and electrical equipment 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:

[0006] An embodiment of the present application provides a battery device, including:

[0007] Box;

[0008] At least two battery cells are located in the box;

[0009] a heat exchange assembly disposed on one side of the battery cell, the heat exchange assembly comprising at least two heat exchange members, at least one of which is configured as a flexible member and at least one of which is configured as a rigid member, the flexible member and the rigid member being stacked to form a medium flow channel, the medium flow channel being configured to conduct a heat exchange medium, the heat exchange medium being configured to exchange heat with the at least two battery cells;

[0010] Wherein, the surface of the heat exchange component has a capillary structure.

[0011] 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 flexible part is lighter in weight, 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.

[0012] 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.

[0013] In this embodiment, the flexible member has a certain degree of flexibility, allowing it to better conform to the battery cells. This helps to absorb the assembly tolerances of the heat exchange assembly, improve the fit between the heat exchange assembly and the battery cells, and increase the effective heat exchange area between the heat exchange assembly and the battery cells, thereby improving the heat exchange efficiency of the heat exchange assembly. The surface of the flexible member facing the battery cells has a capillary structure, which allows the capillary structure to promptly absorb condensed water on the battery cell surface, reducing the risk of condensed water accumulation on the battery cell surface.

[0014] 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 surface-treated to form the capillary structure.

[0015] In this embodiment, the capillary structure and heat exchange assembly can be manufactured separately and then connected together, which reduces the difficulty of manufacturing the capillary structure and heat exchange assembly. The surface of the heat exchange assembly facing the battery cell is surface-treated to form the capillary structure. The capillary structure can be attached to the surface of the heat exchange assembly facing the battery cell through atomic or intermolecular forces, eliminating the assembly process between the capillary structure and the heat exchange assembly.

[0016] 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,

[0017] 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.

[0018] In this embodiment, because the terminal 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 flow on the top of the battery cell is relatively poor. Water vapor easily condenses on the top side of the battery cell to form condensed water. The heat exchange assembly is arranged on the top side of the battery cell, with the capillary structure facing the bottom side, that is, the capillary structure is oriented toward the terminal. This can promptly absorb water vapor in the airflow and reduce the risk of water vapor condensing into condensed water. The box body usually reserves space in the first direction, which easily causes air to be trapped. This can easily cause water vapor to accumulate on the side of the battery cell along the first direction, forming condensed water. The heat exchange assembly is arranged on one side of the battery cell along the first direction, which can promptly absorb the condensed water accumulated on the side of the battery cell along the first direction.

[0019] In some embodiments, the heat exchange assembly includes a coupling plate and a flow channel plate, the flow channel plate having a protrusion and a flow channel portion, the protrusion protruding toward the coupling plate to connect the coupling plate, the flow channel portion and the coupling plate are spaced apart to form the medium flow channel, one of the flexible part and the rigid part is the coupling plate, and 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.

[0020] 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.

[0021] In some embodiments, the heat exchange assembly includes a condensed water collector, and a space on one side of the protrusion facing away from the combining plate forms a recessed space, and the condensed water collector is located in at least a portion of the recessed space.

[0022] In this embodiment, the recessed space is a space formed by the protrusion 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.

[0023] In some embodiments, the condensed water collector is spaced apart from the battery cells.

[0024] In this embodiment, the condensed water collector does not contact the battery cells, which can prevent the battery cells from squeezing the condensed water collector to a certain extent.

[0025] In some embodiments, the condensate collector does not protrude from the recessed space.

[0026] 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.

[0027] 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.

[0028] In this embodiment, both the capillary structure and the condensed 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 condensed water collector is greater than the capillary force of the capillary structure. The condensed water collector can absorb the condensed water temporarily stored in the capillary structure. After the capillary structure removes at least part of the condensed water, it can further absorb the condensed water in the box.

[0029] In some embodiments, an insulating layer is provided on a surface of the rigid member away from the flexible member.

[0030] In this embodiment, the surface of the rigid part away from the flexible part will not form a medium flow channel, and the surface of the rigid part away from the flexible part is easy to contact other objects. An insulating layer is provided 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.

[0031] In some embodiments, the battery device includes a breathing valve, the heat exchange component is located in the box, and the breathing valve is provided in the box.

[0032] In this embodiment, the interior and exterior of the box are connected by a breathing valve. When the pressure inside and outside the box changes, the breathing valve "breathes" to achieve pressure balance, thus exchanging air inside and outside the box. As a result, the air inside the box has a certain humidity and is prone to carrying water vapor. The heat exchange component is located within the box, and its surface has a capillary structure that can quickly absorb condensed water, preventing droplets from forming, thereby reducing the risk of leakage and short circuits caused by the presence of droplets.

[0033] In some embodiments, 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.

[0034] In this embodiment, the flexible part can provide plasticity through the metal layer, allowing the flexible part to 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.

[0035] In some embodiments, the flexible member includes a metal plastic film.

[0036] In this embodiment, the thin and lightweight metal-plasticized film, coupled with the medium flow channel formed between the metal-plasticized film and the rigid component, is unaffected by the extrusion process and eliminates the need for strict thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly. Furthermore, the metal-plasticized film's insulating and heat-transfer medium corrosion properties reduce the likelihood of insulation failure and the risk of reaction between the heat exchange assembly and the heat transfer medium flowing within, further minimizing the possibility of heat transfer medium corrosion and leakage.

[0037] In some embodiments, the flexible member includes an aluminum-plastic film.

[0038] In this embodiment, the flexible part adopts aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation, meeting the insulation and corrosion protection requirements.

[0039] 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.

[0040] In this embodiment, the flexible component, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, by forming a medium flow channel between the flexible and rigid components, it is unaffected by the extrusion process and eliminates the need for strict thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the possibility of corrosion or leakage.

[0041] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or,

[0042] The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0043] In this embodiment, by providing the metal layer with one or more of aluminum foil, copper foil, and steel foil, the flexible component can have a certain structural strength and can also provide an isolation function. By providing the non-metallic layer with one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible component can have a certain degree of waterproofing and / or resistance to corrosion by heat exchange media.

[0044] In some embodiments, the non-metallic layer is a hot-melt layer.

[0045] 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 and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0046] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0047] 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 and increasing the energy density of the battery device.

[0048] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0049] 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 while further making the overall thickness of the heat exchange component smaller, which is beneficial to further reduce the overall volume and weight of the battery device, thereby further increasing the energy density of the battery device.

[0050] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0051] 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 also have a certain deformation ability, which can improve the fit between the heat exchange component and the box body and / or battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the box body and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0052] In some embodiments, the rigid member is configured as a metal plate.

[0053] 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.

[0054] An embodiment of the present application provides an electrical device, comprising any one of the battery devices described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic structural diagram of a vehicle in some embodiments of the present application;

[0056] Figure 2 An exploded schematic diagram of a battery device in some embodiments of the present application;

[0057] Figure 3 for Figure 2 Explosion diagram of the heat exchange component;

[0058] Figure 4 Schematic diagram of an explosion of a flexible member, a capillary structure and a condensed water collector in some embodiments of the present application;

[0059] Figure 5 for Figure 4 Schematic diagram of the assembly of the flexible member, capillary structure and condensate collector;

[0060] Figure 6 for Figure 5 Schematic cross-sectional view in the AA direction;

[0061] Figure 7 for Figure 5 A partially enlarged schematic diagram of the structure shown.

[0062] Description of Reference Numerals

[0063] 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, connector; 2b, recessed space; 201, capillary structure; 202, condensate collector; 3, housing; 31, top cover; 32, annular frame; 33, bottom guard plate. DETAILED DESCRIPTION

[0064] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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.

[0066] 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.

[0067] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0068] It should be noted that, in this application, at least two includes two and more, and a plurality includes two and more.

[0069] 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.

[0070] 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.

[0071] The battery cell 1 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0072] A battery cell 1 generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. The separator is positioned between the positive and negative electrodes. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0073] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0074] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0075] As examples, the positive electrode current collector can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, the metal foil can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. 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.

[0077] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0078] As examples, the negative electrode current collector can be made of metal foil, conductive polymer material, carbon material, or composite current collector. For example, the metal foil can be made of pure metal, alloy, or surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0079] 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.

[0080] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0081] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, 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.

[0082] 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.

[0083] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0084] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0085] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0086] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0087] The liquid electrolyte includes an electrolyte salt and a solvent.

[0088] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0089] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0090] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives capable of improving certain properties of the battery cell 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.

[0091] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0092] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0093] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0094] 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.

[0095] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0096] 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.

[0097] In some embodiments, the electrode assembly is a laminate structure.

[0098] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0099] 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.

[0100] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0101] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0102] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0103] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0104] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0105] 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, in a non-sealed structure, the outer shell protects the electrode assembly and includes a sealing bag between the outer shell and the electrode assembly, which encapsulates the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating structure or an aluminum-plastic film. In a sealed structure, the outer shell encapsulates the electrode assembly, electrolyte, and other components.

[0106] 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 this application.

[0107] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0108] In some embodiments, the housing is provided with at least one pole, which is electrically connected to the tab. The pole may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The pole may be provided on the end cap or on the housing.

[0109] In some embodiments, a pressure relief mechanism is provided on the housing to discharge the internal gas of the battery cell 1 .

[0110] For example, when the internal pressure or temperature of a battery cell 1 reaches a predetermined threshold, the pressure relief mechanism activates to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 1 reaches the predetermined threshold, the pressure relief mechanism activates or a weakened structure within the pressure relief mechanism is destroyed, thereby creating an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell 1.

[0111] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0112] As an example, the pressure relief mechanism may also be provided separately from and connected to the housing.

[0113] The "activation" mentioned in this application refers to the action of the pressure relief mechanism or its activation 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 movement of components in the pressure relief mechanism to form an exhaust channel, at least a part of the pressure relief mechanism rupturing, breaking, tearing or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged outward from the actuated part as emissions. In this way, the pressure and temperature of the battery cell 1 can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0114] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas from the interior of the battery cell 1 .

[0115] The emissions from the battery cell 1 mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, separator fragments, high-temperature and high-pressure gas generated by the reaction, flames, etc.

[0116] 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.

[0117] The battery apparatus 100 mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include a plurality of battery cells 1 .

[0118] Multiple battery cells 1 can be connected in series, in parallel or in mixed series via a busbar component. The busbar component is used to achieve electrical connection between at least two battery cells 1.

[0119] For example, hybrid means that at least two battery cells 1 are connected both in series and in parallel. At least two battery cells 1 can be directly connected in series, in parallel, or in hybrid. Of course, at least two battery cells 1 can also be connected in series, in parallel, or in hybrid to form a module, and the module can then be connected in series, in parallel, or in hybrid to form a whole.

[0120] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 1 .

[0121] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells 1 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 1 with a cable tie.

[0122] In some embodiments, the battery device 100 may be a battery pack.

[0123] 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 .

[0124] As an example, the battery cell assembly may also be housed in the box body 3 by directly fixing the plurality of battery cells 1 to the box body 3 .

[0125] In some embodiments, the box 3 may serve as part of the chassis structure of the vehicle 1000. For example, part of the box 3 may become at least part of the floor of the vehicle 1000, or part of the box 3 may become at least part of the cross member and longitudinal member of the vehicle 1000.

[0126] An embodiment of the present application provides an electrical device, which includes the battery device 100 in any one of the embodiments of the present application. The battery device 100 is used to store or provide electrical energy.

[0127] Electrical devices include, but are not limited to, energy storage devices, mobile phones, tablets, laptop computers, electric toys, electric tools, vehicles 1000, ships, or spacecraft, etc. Vehicles 1000 may include battery vehicles and electric cars, electric toys may include battery vehicle toys and electric car toys, etc. Fixed or mobile electric toys may include, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0128] Energy storage devices include but are not limited to energy storage containers or energy storage cabinets, etc.

[0129] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as an example, that is, a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0130] Figure 1 The schematic diagram of the structure of the 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. 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 within vehicle 1000. Battery device 100 can be disposed at the bottom of vehicle 1000 or at the front or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as an operating power source for vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery device 100 to power motor 300, for example, to meet the power requirements of vehicle 1000 during startup, navigation, and driving.

[0131] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0132] In related technologies, during the operation of a battery device, the temperature of the battery cells generally rises. The heat exchange component absorbs the heat of the battery cells, i.e., 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.

[0133] In view of this, an embodiment of the present application provides a battery device, comprising a housing, at least two battery cells, and a heat exchange assembly. The at least two battery cells are located within the housing. The heat exchange assembly is disposed on one side of the battery cells and includes at least two heat exchange components, at least one of which is configured as a flexible component and at least one of which is configured as a rigid component. The flexible and rigid components are stacked to form a medium flow channel, which is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells. The surface of the heat exchange assembly has a capillary structure.

[0134] 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 flexible part is lighter in weight, 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.

[0135] The battery device 100 provided in the embodiment of the present application is further described below with reference to the accompanying drawings. Figures 2 to 7An embodiment of the present application provides a battery device 100 , which includes a box 3 , at least two battery cells 1 and a heat exchange component 2 .

[0136] At least two battery cells 1 are located within the housing 3. A heat exchange assembly 2 is positioned on one side of the battery cells 1. The heat exchange assembly 2 includes at least two heat exchange components, at least one of which is a flexible component 21 and at least one of which is 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, which is used to exchange heat with the at least two battery cells 1. The surface of the heat exchange assembly 2 has a capillary structure 201.

[0137] The box body 3 can be used to contain the battery cells 1 and other structural components, provide protection for the battery cells 1 and other structural components, and reduce the impact of foreign matter outside the box body 3 on the charging or discharging of the battery cells 1.

[0138] The flexibility of the flexible member 21 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its light weight, or it can be a property imparted to the material due to at least one of its thickness, stiffness, strength, elastic modulus, elongation at break, etc. As an example, the material of the flexible member 21 can be selected to be a material that is lighter than conventional structures such as aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible member 21. In the embodiment of the present application, by configuring the heat exchange assembly 2 to include the flexible member 21, the weight of the heat exchange assembly 2 is reduced.

[0139] The rigidity of the rigid part 22 refers to the material properties of the structure. This type of property can be a property imparted to the material due to its heavy mass, or a property imparted to the material due to at least one of its thickness, rigidity, 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 structural material 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. In the embodiment of the present application, by configuring the heat exchange component 2 to include the rigid part 22, it can play a supporting role for the flexible part 21, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2.

[0140] 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, can undergo shape change under normal use.

[0141] By configuring the heat exchange component 2 to include the flexible component 21 and the rigid component 22 , the heat exchange component 2 can be made flexible while also having a certain structural strength.

[0142] The flexible member 21 and the rigid member 22 are stacked to form the medium flow channel 2a. This 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 forms at least a portion of the sidewalls of the medium flow channel 2a, and the rigid member 22 also forms at least a portion of the sidewalls of the medium flow channel 2a. The heat exchange medium flows through the medium flow channel 2a to exchange heat with the battery cell 1.

[0143] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve 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 coolant as an example.

[0144] It should be noted that the specific number of the medium flow channels 2a is not limited here and can be one or more.

[0145] The heat exchange assembly 2 includes at least two heat exchange elements, that is, there are multiple heat exchange elements.

[0146] At least one heat exchange component is configured as a flexible component 21, which means that there are one or more flexible components 21. In the embodiment where multiple heat exchange components are configured as flexible components 21, the flexible components 21 may be the same or different.

[0147] At least one heat exchange element is configured as a rigid element 22, which means that there are one or more rigid elements 22. In the embodiment where multiple heat exchange elements are configured as rigid elements 22, the rigid elements 22 may be the same or different.

[0148] 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 .

[0149] Illustratively, the rigid component 22 is a rigid layered structure, which can support the flexible component 21 , thereby facilitating improvement of the overall structural strength and stability of the heat exchange assembly 2 .

[0150] The capillary structure 201 is provided on the surface of the heat exchange component 2 , and the capillary structure 201 may be provided on the surface of the rigid component 22 or the surface of the flexible component 21 .

[0151] Capillary structure 201 is a structure capable of generating capillary forces to drive liquid flow. For example, capillary structure 201 may have multiple first pores. The size of the first pores is in the micrometer range, for example, the pore diameter of the first pores is no greater than 1 mm. Preferably, the pore diameter of the first pores is between 1 μm and 100 μm. The basic principle is that the spontaneous flow of liquid is achieved through the synergistic effect of the surface tension of the liquid and the first pores of capillary structure 201.

[0152] It should be noted that the unit "mm" refers to millimeter, and the unit "μm" refers to millimeter.

[0153] The capillary structure 201 can absorb condensed water, which is liquid formed by condensation of water vapor in the box body 3. This can reduce the risk of water vapor gathering into droplets.

[0154] The pore diameter of the first pores may be measured by a gas adsorption method and / or a mercury intrusion method.

[0155] The principle of mercury intrusion porosimetry is to use high-pressure mercury to intrude into pores and calculate the pore size distribution based on the intrusion amount. For details, please refer to "GB / T 21650.1-2008 Determination of Pore Size Distribution and Porosity of Solid Materials by Mercury Intrusion Porosimetry and Gas Adsorption Method".

[0156] The gas adsorption method analyzes pore size based on gas adsorption isotherms (e.g., the BET method). For details, please refer to "GB / T 19587-2017 Determination of Specific Surface Area of ​​Solids by Gas Adsorption BET Method" and "GB / T 21650.2-2008 Analysis of Mesopores and Macropores by Gas Adsorption."

[0157] 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 configuring the heat exchange component 2 to include a flexible part 21 and a rigid part 22, the flexible part 21 is lighter in weight, which helps to reduce the weight of the heat exchange component 2, reduces the production cost of the heat exchange component 2, and helps to reduce 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 helps to improve the overall structural strength and stability of the heat exchange component 2 and improve 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.

[0158] The shape of the box 3 is not limited. For example, the box 3 can be a simple three-dimensional structure such as a 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, with both the length and width of the box 3 parallel to the horizontal plane, and the length of the box 3 is parallel to the longest side of the rectangular parallelepiped.

[0159] 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.

[0160] For some examples, see Figure 2 and Figure 3 The housing 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, while the bottom guard plate 33 closes the bottom opening of the annular frame 32. The top cover 31, annular frame 32, and bottom guard plate 33 collectively define a receiving cavity, within which at least two battery cells 1 and the heat exchange assembly 2 are located. Specifically, the capillary structure 201 is also located within the receiving cavity.

[0161] The annular frame 32 may be substantially square, rectangular, or in other shapes. In some embodiments, the annular frame 32 may include four side panels, each of which may be an extruded plate-shaped profile. The four side panels are welded in sequence along the circumference to form the annular frame 32 .

[0162] The accommodating cavity can be a sealed space or a non-sealed space.

[0163] The top cover 31 may be welded to the annular frame 32 or connected to the annular frame 32 by fasteners.

[0164] The bottom guard plate 33 can be welded to the annular frame 32 or connected via fasteners. For example, the heat exchange assembly 2 also includes an inlet and an outlet, both of which communicate with the medium flow channel 2a. The inlet and outlet of the heat exchange assembly 2 are used to connect to the pipelines of the vehicle or electrical device's air conditioning system or a liquid storage device such as a water tank.

[0165] For example, see Figure 3 The heat exchange component 2 further 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.

[0166] For example, the connecting member 23 is connected to the rigid member 22 by soldering.

[0167] Exemplarily, the connecting member 23 is a water tap.

[0168] The principle of heat exchange component 2 for 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. 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.

[0169] Here, the heat exchange component 2 exchanges heat with the battery cell 1 to dissipate heat from the battery cell 1 or to heat the battery cell 1 .

[0170] The principle of heat dissipation of the battery cell 1 by the heat exchange component 2 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, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell 1.

[0171] The principle of heat exchange component 2 heating 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.

[0172] In some embodiments, the surface of the heat exchange component 2 facing the battery cell 1 has a capillary structure 201 .

[0173] 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.

[0174] 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.

[0175] For some examples, see Figures 2 to 7 The rigid member 22 is arranged on a side of the flexible member 21 away from the battery cell 1 , and the surface of the flexible member 21 facing the battery cell 1 has a capillary structure 201 .

[0176] 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 to press the capillary structure 201 against the surface of the battery cell 1 .

[0177] In this embodiment, the flexible member 21 has a certain degree of flexibility, allowing it to better fit the battery cell 1, thereby facilitating the absorption of assembly tolerances of the heat exchange assembly 2, improving the fit between the heat exchange assembly 2 and the battery cell 1, and increasing the effective heat exchange area between the heat exchange assembly 2 and the battery cell 1, thereby improving 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 promptly absorb condensed water on the surface of the battery cell 1, reducing the risk of condensed water accumulation on the surface of the battery cell 1.

[0178] 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. This design allows the rigid member 22 to have good thermal conductivity and support capabilities, and the rigid member 22 can firmly support the capillary structure 201, providing good thermal conductivity.

[0179] In some embodiments, the capillary structure 201 is connected to the surface of the heat exchange component 2 .

[0180] In some embodiments, the capillary structure 201 is connected to the surface of the heat exchange component 2 facing the battery cell 1 .

[0181] As an example, the capillary structure 201 may be bonded to the surface of the heat exchange component 2. Bonding methods include, but are not limited to, glue or double-sided tape.

[0182] The capillary structure 201 may also be connected to the surface of the heat exchange component 2 by heat pressing, welding or other methods.

[0183] 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.

[0184] In some embodiments, the surface of the heat exchange component 2 is treated to form a capillary structure 201 .

[0185] 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 .

[0186] Surface treatment refers to the process of changing the surface properties of a material by physical or chemical means.

[0187] 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 .

[0188] 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 .

[0189] 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.

[0190] 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.

[0191] 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 .

[0192] 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.

[0193] It should be noted that the top side X1 and the bottom side X2 are two opposite sides in the top-bottom direction X. Usually, the bottom side X2 faces the ground, and the top side X1 faces the sky.

[0194] 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 easily condenses 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.

[0195] In some embodiments, the heat exchange assembly 2 is disposed on one side of the battery cell 1 along a first direction, where the first direction is perpendicular to the top-bottom direction X.

[0196] Taking a prismatic battery cell 1 as an example, the first direction can be perpendicular to the outer surface of the housing. This allows the heat exchange assembly 2 to contact the outer surface of the battery cell 1, increasing the heat exchange area. Of course, the first direction can also be parallel to the outer surface of the housing, allowing the heat exchange assembly 2 to be located on the side of the housing where it meets the outer surface.

[0197] 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.

[0198] 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.

[0199] In some embodiments, the heat exchange assembly 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.

[0200] 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 stacked regularly.

[0201] The combined plate can be a flat plate structure, which means that the two surfaces of the plate body along the stacking direction are basically flat. Of course, the combined plate can also be a non-flat plate structure.

[0202] One of the flexible part 21 and the rigid part 22 is a coupling plate, and the other one is a flow channel plate. That is, if the flexible part 21 is a coupling plate, the rigid part 22 is a flow channel plate; if the rigid part 22 is a coupling plate, the flexible part 21 is a flow channel plate.

[0203] As an example, the flexible member 21 is a coupling plate, the rigid member 22 is a flow channel plate, and the rigid member 22 has a protrusion and a flow channel portion. The protrusion protrudes toward and connects to the flexible member 21, and the space between the flow channel portion and the flexible member 21 is the medium flow channel 2a. Here, the protrusion and the flow channel portion can be formed in the rigid member 22 by a stamping process.

[0204] As an example, the rigid member 22 is a coupling plate, the flexible member 21 is a flow channel plate, and the flexible member 21 has a protrusion and a flow channel portion. The protrusion protrudes toward and connects to the rigid member 22, and the space between the flow channel portion and the rigid member 22 is the medium flow channel 2a. Here, the protrusion and the flow channel portion can be formed in the flexible member 21 through a hot pressing process.

[0205] 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 the capillary structure 201, or the surface of the flexible member 21 facing the battery cell 1 may have the capillary structure 201. The capillary structure 201 may cover the entire surface of the flow channel plate facing the battery cell 1.

[0206] 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.

[0207] For some examples, see Figures 4 to 7 The heat exchange component 2 includes a condensed water collector 202, and 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 the condensed water collector 202.

[0208] The condensation water collector 202 can provide a condensation water collection function and can be a structure capable of generating capillary force to drive liquid flow.

[0209] Condensate collector 202 may have multiple second pores. The size of the second pores is in the micrometer range, for example, less than 1 mm in diameter. Preferably, the diameter of the second pores is between 1 μm and 100 μm. The basic principle is to achieve spontaneous liquid flow through the synergistic effect of the liquid's surface tension and the second pores.

[0210] The pore size of the second pore 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.

[0211] 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.

[0212] In this embodiment, the recessed space 2b is a space formed by the protrusion 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.

[0213] In some embodiments, the condensed water collector 202 is spaced apart from the battery cell 1 .

[0214] 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.

[0215] For some examples, see Figure 6 and Figure 7, the condensed water collector 202 does not protrude from the recessed space 2b.

[0216] As an example, in the stacking direction of the heat exchange assembly 2, the depth of the recessed space 2b is no 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, while 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.

[0217] 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 the battery cell 1, the condensate collector 202 can basically be spaced apart from the battery cell 1, and the battery cell 1 basically will not squeeze the condensate collector 202.

[0218] In some embodiments, the capillary structure 201 has a first hole, and the condensation water collector 202 has a second hole, and the diameter of the second hole is smaller than the diameter of the first hole.

[0219] The first hole and the second hole can be as described above and will not be described again here.

[0220] In this embodiment, the capillary structure 201 and the condensed 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 condensed water collector 202 is greater than the capillary force of the capillary structure 201. The condensed water collector 202 can absorb the condensed water temporarily stored in the capillary structure 201. After the capillary structure 201 removes at least part of the condensed water, it can further absorb the condensed water in the box body 3.

[0221] In some embodiments, an insulating layer is provided on a surface of the rigid component 22 away from the flexible component 21 .

[0222] The insulation layer is a layered structure that provides insulation function.

[0223] In this embodiment, the surface of the rigid part 22 away from the flexible part 21 does not form a medium flow channel 2a, and the surface of the rigid part 22 away from the flexible part 21 is prone to contact with other objects. 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.

[0224] In some embodiments, the battery device 100 includes a breathing valve, the heat exchange assembly 2 is located in the box 3, and the breathing valve is provided in the box 3.

[0225] 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 outside the box 3 through the breathing valve.

[0226] In this embodiment, the interior and exterior of the housing 3 are connected via a breathing valve. When the pressure inside and outside the housing 3 changes, the breathing valve "breathes" to achieve pressure equilibrium. This allows air to exchange air inside and outside the housing 3. As a result, the air inside the housing 3 has a certain humidity and is prone to carrying water vapor. The heat exchange assembly 2 is located within the housing 3 and has a capillary structure 201 on its surface. This capillary structure 201 absorbs condensed water immediately, preventing droplets from forming and reducing the risk of leakage and short circuits caused by the presence of droplets.

[0227] 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.

[0228] The metal layer is a structure formed by spreading metal materials.

[0229] The anti-corrosion layer is a structure with anti-corrosion function.

[0230] It is understandable that the two anti-corrosion layers can be made of the same material or different materials.

[0231] In this embodiment, the flexible part 21 can provide plasticity through the metal layer, allowing the flexible part 21 to 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.

[0232] 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.

[0233] Here, the protruding portion is at least a portion of the hot pressing area, and the flow channel portion forms the medium flow channel 2 a.

[0234] That is, the flexible member 21 and the rigid member 22 are connected by hot pressing, and the hot pressing area and the medium flow channel 2 a are formed by hot pressing. This molding method is simple.

[0235] 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.

[0236] 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.

[0237] Illustratively, the hot pressing area includes a heat-sealing area and a non-heat-sealing area. The non-heat-sealing area and the medium flow channel 2a are located on either side of the heat-sealing area, respectively. This helps reduce the width of the heat-sealing area, thereby alleviating the problem of excessively high temperatures caused by an overly wide heat-sealing area, which can affect the quality of hot pressing and damage the flexible member 21. Furthermore, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 21 is folded, thereby alleviating the problem of stress concentration in the heat-sealing area leading to damage to the heat-sealing area.

[0238] In related technologies, the heat exchange component is formed by welding two pieces of high-strength aluminum alloy. However, due to the high alloy content of high-strength aluminum alloy (5 series, 6 series, etc.), alloy elements will precipitate during welding, affecting the welding quality.

[0239] 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 the alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 2.

[0240] In some embodiments, the flexible member 21 is a single-layer or multi-layer film.

[0241] In some embodiments, the flexible member 21 includes a metal plastic film.

[0242] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0243] In this embodiment, the thin and lightweight metal plasticized film, coupled with the medium flow channel 2a formed between the metal plasticized film and the rigid member 22, is unaffected by the extrusion process and eliminates the need for high thickness requirements. This reduces the overall thickness and weight of the heat exchange assembly 2. Furthermore, the metal plasticized film's insulating and heat medium corrosion resistance reduces the likelihood of insulation failure and the risk of reaction between the heat exchange assembly 2 and the heat medium flowing therein, further minimizing the possibility of corrosion and leakage of the heat exchange medium.

[0244] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0245] 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, meeting insulation and corrosion protection requirements.

[0246] In some embodiments, the flexible member 21 has 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.

[0247] Here, the flexible member 21 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0248] For example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0249] Here, the number of metal layers and non-metal layers is not limited.

[0250] In this embodiment, the flexible member 21, composed of a stack of metal and non-metal layers, is thin and lightweight. Furthermore, the medium flow channel 2a formed between the flexible member 21 and the rigid member 22 is unaffected by the extrusion process and eliminates the need for a high thickness requirement. This reduces the overall thickness and weight of the heat exchange assembly 2. Furthermore, the heat exchange assembly 2 does not react with the heat exchange medium flowing therein, eliminating the possibility of corrosion or leakage.

[0251] 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 .

[0252] That is, the non-metallic layer is located between the metal layer and the rigid member 22 .

[0253] Here, by arranging the non-metallic layer on the side of the metal layer facing the rigid component 22 , the non-metallic layer can be connected to the rigid component 22 through hot pressing.

[0254] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0255] 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.

[0256] In some embodiments, the non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0257] 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.

[0258] For example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, additives may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0259] In some embodiments, the non-metallic layer is a hot-melt layer.

[0260] 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 and the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0261] In some embodiments, the thickness of the flexible member 21 is 0.05 mm-0.3 mm.

[0262] 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.

[0263] 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, thereby increasing the energy density of the battery device 100.

[0264] In some embodiments, the thickness of the flexible member 21 is 0.08 mm-0.2 mm.

[0265] 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.

[0266] 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, while further making the overall thickness of the heat exchange component 2 smaller, which is beneficial to further reduce the overall volume and weight of the battery device 100, thereby further increasing the energy density of the battery device 100.

[0267] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa-10000 MPa.

[0268] Exemplarily, the elastic modulus of the flexible part 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.

[0269] 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.

[0270] In some embodiments, the rigid member 22 is configured as a metal plate.

[0271] For example, it may be an aluminum alloy.

[0272] 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.

[0273] 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 the length direction of the battery cell 1 .

[0274] The plurality of sub-flow channels are connected to form a medium flow channel 2a.

[0275] The extension direction of the sub-flow channels is perpendicular to the length direction of the battery cell 1 , that is, the multiple sub-flow 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-flow channels.

[0276] 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 beneficial to improve the temperature uniformity of the battery cell 1.

[0277] The battery device 100 provided in the embodiment of the present application is further described below with a specific embodiment. Figures 2 to 7 The battery device 100 provided in an 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, and the medium flow channel 2a is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the at least two battery cells 1.

[0278] 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 the 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.

[0279] In this embodiment, the heat exchange assembly 2 is used to exchange heat with the battery cell 1. By configuring the heat exchange assembly 2 to include a flexible member 21 and a rigid member 22, the flexible member 21 is lightweight, which helps reduce the mass of the heat exchange assembly 2, lowering its production cost 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 provides support for the flexible member 21, thereby improving the overall structural strength and stability of the heat exchange assembly 2 and enhancing its applicability. The flexible member 21 has a certain degree of flexibility, allowing it to better conform to the battery cell 1. This helps absorb assembly tolerances of the heat exchange assembly 2, improves the fit between the heat exchange assembly 2 and the battery cell 1, and increases the effective heat exchange area between the heat exchange assembly 2 and the battery cell 1, thereby enhancing the heat exchange efficiency of the heat exchange assembly 2. The surface of the flexible member 21 facing the battery cell 1 has a capillary structure 201, which allows the capillary structure 201 to promptly absorb condensed water on the surface of the battery cell 1, reducing the risk of condensed water accumulation on the surface of the battery cell 1. The recessed space 2b is a space formed by the protrusion 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.

[0280] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 various technical features mentioned in the various embodiments 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 disposed on one side of the battery cell, the heat exchange assembly comprising at least two heat exchange members, at least one of which is configured as a flexible member and at least one of which is configured as a rigid member, the flexible member and the rigid member being stacked to form a medium flow channel, the medium flow channel being configured to conduct a heat exchange medium, the heat exchange medium being configured to exchange heat with the at least two battery cells; The heat exchange assembly includes a coupling plate, a flow channel plate, and a condensed water collector. The flow channel plate has a protrusion and a flow channel portion. The protrusion protrudes toward the coupling plate to connect to the coupling plate. The flow channel portion is spaced from the coupling plate to form the medium flow channel. One of the flexible member and the rigid member is the coupling plate, and the other of the flexible member and the rigid member is the flow channel plate. The surface of the flow channel plate facing the battery cell has a capillary structure. The capillary structure covers the entire surface of the flow channel plate facing the battery cell, and the capillary structure can absorb condensed water. A concave space is formed on one side of the protruding portion away from the combining plate, and the condensed water collector is located in at least a portion of the concave space; The capillary structure has a first hole, and the condensed water collector has a second hole. The diameter of the second hole is smaller than that of the first hole.

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

3. The battery device according to claim 1, wherein: 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, wherein: 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, wherein: The condensed water collector is spaced apart from the battery cells.

6. The battery device according to claim 1, wherein: The condensed water collector does not protrude from the recessed space.

7. The battery device according to claim 1, wherein: An insulating layer is provided on a surface of the rigid component away from the flexible component.

8. The battery device according to claim 1, wherein: 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.

9. The battery device according to any one of claims 1 to 8, 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.

10. The battery device according to any one of claims 1 to 8, characterized in that: The flexible member includes a metal plasticized film.

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

12. The battery device according to any one of claims 1 to 8, characterized in that: The flexible member is a layered structure, comprising a metal layer and a non-metal layer, wherein the metal layer and the non-metal layer are stacked in sequence.

13. The battery device according to claim 12, wherein: 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.

14. The battery device according to claim 13, wherein: The non-metallic layer is a hot-melt layer.

15. The battery device according to any one of claims 1 to 8, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

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

17. The battery device according to any one of claims 1 to 8, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

18. The battery device according to any one of claims 1 to 8, characterized in that: The rigid member is configured as a metal plate.

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

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