Battery device and electric equipment

Abstract

The invention relates to the technical field of batteries, and provides a battery device and electric equipment. The battery device comprises a box body, at least two battery monomers and a heat exchange assembly, the at least two single batteries are arranged in the box body; the heat exchange assembly comprises at least two heat exchange pieces, at least one heat exchange piece is arranged to be a flexible piece, at least one heat exchange piece is arranged to be a rigid piece, the flexible piece and the rigid piece are arranged in a stacked mode to form a medium flow channel, the medium flow channel is used for conducting a heat exchange medium, and the heat exchange medium is used for conducting heat exchange with at least two single batteries; the flexible part is of a layered structure and comprises a metal layer and a non-metal layer, and the metal layer and the non-metal layer are sequentially arranged in a stacked mode. Wherein the rigid member is configured as a part of the box body. The mass of the flexible part is light, the mass of the heat exchange assembly can be reduced, the rigid part is used for being stacked with the flexible part to form the medium flow channel, the rigid part is also used for forming the box body, the number of parts of the battery device can be reduced, and the weight of the battery device can be reduced.

Description

Technical Field

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

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

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

[0004] In view of this, the embodiments of the present application hope to provide a battery device and an electrical equipment, wherein the weight of the flexible part is relatively light, which is helpful to reduce the weight of the heat exchange component.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows: The present application provides a battery device, including: Box; At least two battery cells are disposed in the box; A heat exchange assembly, wherein the heat exchange assembly comprises at least two heat exchange parts, at least one of which is configured as a flexible part, and at least one of which is configured as a rigid part, wherein the flexible part and the rigid part are stacked to form a medium flow channel, wherein the medium flow channel is used to conduct a heat exchange medium, and wherein the heat exchange medium is used to exchange heat with the at least two battery cells; wherein the flexible part is a layered structure, wherein the flexible part comprises a metal layer and a non-metal layer, and wherein the metal layer and the non-metal layer are stacked in sequence; Wherein, the rigid component is configured as a part of the box body.

[0006] In the battery device provided by the embodiment of the present application, the heat exchange component is used to exchange heat with the battery cell. By setting the heat exchange component to include a flexible part and a rigid part, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device. The flexible part and the rigid part are stacked to form at least one medium flow channel. The rigid part can support the flexible part, which is conducive to improving the overall structural strength and stability of the heat exchange component and improving the applicability of the heat exchange component. The rigid part is configured as a part of the box body, that is, the rigid part is used to stack with the flexible part to form the medium flow channel, and the rigid part is used to form the box body. Such a design can reduce the number of parts of the battery device and is conducive to reducing the weight of the battery device. The flexible part stacked in sequence by the metal layer and the non-metal layer is thin in thickness and light in weight, and by forming the medium flow channel between the flexible part and the rigid part, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0007] In some embodiments, the flexible member is connected to a side of the rigid member away from the at least two battery cells, and the at least two battery cells are connected to the rigid member.

[0008] In this embodiment, at least two battery cells are connected to the rigid member, which can support the battery cells more stably, and the flexible member is connected to the side of the rigid member away from the at least two battery cells, which reduces the risk of the battery cells contacting and squeezing the flexible member to a certain extent. The rigid member has good structural strength and can withstand relatively large assembly forces while maintaining its shape unchanged.

[0009] In some embodiments, a portion of the rigid member protrudes toward a side away from the at least two battery cells to form a recessed area, and the at least two battery cells are located in the recessed area.

[0010] In this embodiment, the recessed area is conducive to limiting the position of at least two battery cells, thereby facilitating the assembly of the battery cells and the rigid component.

[0011] In some embodiments, the box body includes a box body, the rigid part includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, and takes the plane perpendicular to the top and bottom directions as the projection surface, the projection of the flexible part is located within the projection range of the main body area, the flexible part and the main body area define the medium flow channel, the avoidance area is connected to the box body, the rigid part and the box body jointly define a accommodating cavity, and the at least two battery cells are located in the accommodating cavity.

[0012] In this embodiment, the rigid part and the box body jointly define a accommodating cavity, and at least two battery cells are located in the accommodating cavity. The rigid part is a partial side wall of the box body, which plays a role in protecting the battery cells. The size of the flexible part is smaller than that of the rigid part. The flexible part is within the range of the main area, and the flexible part is basically not in contact with the avoidance area, thereby reducing the impact on the flexible part during the assembly process of the avoidance area and the box body.

[0013] In some embodiments, the avoidance zone is welded to the box body or connected to the box body by fasteners.

[0014] In this embodiment, the avoidance area is welded to the box body. Since the projection of the flexible part is located within the projection range of the main area, during the welding process between the avoidance area and the box body, the distance between the welding position and the flexible part is greater than zero, and the high welding temperature will not directly act on the flexible part, thereby reducing the risk of local melting of the flexible part during the welding process. Since the projection of the flexible part is located within the projection range of the main area, during the fastening and assembly process between the avoidance area and the box body, the distance between the fastener and the flexible part is greater than zero, and the high temperature generated during the high-speed rotation of the fastener will not directly act on the flexible part, thereby reducing the risk of local melting of the flexible part during the connection process through the fastener.

[0015] In some embodiments, the width of the avoidance zone is between 5 mm and 15 mm.

[0016] In this embodiment, the width of the avoidance zone is moderate, which not only has sufficient space for connecting with the box body to avoid the flexible parts, but also can avoid occupying the area of ​​the main area as much as possible. The main area retains enough area to form the medium flow channel, taking into account the heat exchange requirements.

[0017] In some embodiments, the box body includes a box body and a bottom guard plate, and the box body includes: An annular frame having a top opening and a bottom opening, wherein the rigid member is connected to the annular frame and closes the bottom opening; The top cover closes the top opening of the annular frame. The top cover, the annular frame and the rigid member jointly define a receiving cavity. The at least two battery cells are located in the receiving cavity. The bottom guard plate is located on the bottom side of the flexible member and is connected to the annular frame.

[0018] In this embodiment, the annular frame and the top cover can be manufactured separately and then assembled into the box body. The rigid member and the box body together define a receiving cavity. At least two battery cells are located in the receiving cavity. The rigid member is a part of the side wall of the box body, which plays a role in protecting the battery cells. The bottom guard plate is located at the bottom side of the flexible member, and the bottom guard plate can protect the flexible member to prevent objects outside the box from contacting the flexible member.

[0019] In some embodiments, the box body includes a box body, the box body is open to the bottom side, the rigid member closes the bottom side opening of the box body to jointly define a receiving cavity, and the at least two battery cells are located in the receiving cavity.

[0020] In this embodiment, the rigid member closes the bottom opening of the box body, and the rigid member serves as the bottom wall of the box body, which can reduce the weight of the entire battery pack.

[0021] In some embodiments, the flexible member includes a metal plastic film.

[0022] In this embodiment, since the metal plastic film is thin and light in weight, and a medium flow channel is formed between the metal plastic film and the rigid part, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the thickness and weight of the heat exchange component as a whole can be reduced. At the same time, since the metal plastic film has the characteristics of insulation and heat exchange medium corrosion resistance, the possibility of insulation failure can be reduced, and the risk of the heat exchange component reacting with the heat exchange medium flowing inside is also reduced, further reducing the possibility of heat exchange medium corrosion leakage.

[0023] In some embodiments, the flexible member comprises an aluminum-plastic film.

[0024] In this embodiment, the flexible part is made of aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, and meets insulation and corrosion protection requirements.

[0025] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or, The non-metallic layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0026] In this embodiment, by setting the metal layer to one or more of aluminum foil, copper foil and steel foil, the flexible member can have a certain structural strength and can play an isolation role. By setting the non-metal layer to one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member can have a certain waterproof effect and / or resistance to corrosion by heat exchange media.

[0027] In some embodiments, the non-metallic layer is a hot-melt layer.

[0028] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0029] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0030] In this embodiment, by setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while making the overall thickness of the heat exchange component smaller, which is beneficial to reducing the overall volume and weight of the battery device to increase the energy density of the battery device.

[0031] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0032] In this embodiment, by setting the thickness of the flexible part to 0.08mm-0.2mm, the heat exchange component made of the flexible part has a certain structural strength, and the overall thickness of the heat exchange component is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device, so as to further increase the energy density of the battery device.

[0033] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0034] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and has a certain deformation ability, which can improve the fit between the heat exchange component and the case and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the case and / or the battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0035] In some embodiments, the rigid member is configured as a metal plate.

[0036] 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.

[0037] An embodiment of the present application further provides an electrical device, comprising any one of the battery devices described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a vehicle in some embodiments of the present application; Figure 2 An exploded schematic diagram of a battery device in some embodiments of the present application; Figure 3 for Figure 2 Explosion diagram of the heat exchange component; Figure 4 for Figure 3 Schematic diagram of the assembly of the heat exchange component; Figure 5Schematic diagram of the assembly of heat exchange components in other embodiments of the present application; Figure 6 Schematic diagram of explosion of heat exchange components in other embodiments of the present application; Figure 7 for Figure 6 Schematic diagram of the assembly of the heat exchange components.

[0039] Description of Reference Numerals 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 2, heat exchange component; 2a, medium flow channel; 21, flexible part; 22, rigid part; 22a, recessed area; 221, avoidance area; 222, main body area; 23, connecting part; 3, box body; 31, annular frame; 32, top cover; 33, bottom guard plate. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] It should be noted that, in the present application, at least two includes a number of two and more than two. A plurality includes a number of two and more than two.

[0044] 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.

[0045] 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.

[0046] The battery cell 1 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0047] The battery cell 1 generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 1, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0048] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0049] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0050] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0051] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0052] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0053] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0054] 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.

[0055] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0056] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cell 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0057] 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.

[0058] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0059] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0060] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0061] In some embodiments, the battery cell 1 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0062] The liquid electrolyte includes an electrolyte salt and a solvent.

[0063] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0064] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0065] In some embodiments, the electrolyte may further include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 1, such as additives that improve the overcharge / fast charge performance of the battery cell 1, additives that improve the high temperature performance of the battery cell 1, and additives that improve the low temperature performance of the battery cell 1.

[0066] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0067] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0068] As examples, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0069] 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.

[0070] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0071] 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.

[0072] In some embodiments, the electrode assembly is a laminate structure.

[0073] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0074] 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.

[0075] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0076] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0077] As an example, the separator may be disposed continuously, and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0078] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0079] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0080] In some embodiments, the battery cell 1 may include a shell. The 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 shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealing bag is also included between the shell and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0081] As an example, the battery cell 1 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in the present application.

[0082] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0083] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0084] In some embodiments, a pressure relief mechanism is provided on the housing, and is used to discharge the internal gas of the battery cell 1 .

[0085] As an example, when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 1.

[0086] As an example, the pressure relief mechanism may be integrally formed with the housing.

[0087] As an example, the pressure relief mechanism may also be separately provided and connected to the housing.

[0088] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 1 can be released. The action produced by the pressure relief mechanism may include but is not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism ruptures, breaks, is torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell 1 will be discharged from the actuated part as emissions. In this way, the battery cell 1 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0089] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be set as a through hole to discharge the gas inside the battery cell 1.

[0090] The emissions from the battery cell 1 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, and the like.

[0091] 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.

[0092] The battery apparatus 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 1 .

[0093] A plurality of battery cells 1 can be connected in series, in parallel or in mixed connection through a busbar component. The busbar component is used to realize electrical connection between at least two battery cells 1.

[0094] For example, hybrid connection means that at least two battery cells 1 are both connected in series and in parallel. At least two battery cells 1 can be directly connected in series, in parallel, or in hybrid connection; of course, at least two battery cells 1 can be first connected in series, in parallel, or in hybrid connection to form a module, and the module can then be connected in series, in parallel, or in hybrid connection to form a whole.

[0095] In some embodiments, a battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 1 .

[0096] As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 1 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 1 by a cable tie.

[0097] In some embodiments, the battery device 100 may be a battery pack.

[0098] See also Figure 2 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 .

[0099] As an example, the battery cell assembly may also be accommodated in the box body 3 by directly fixing the plurality of battery cells 1 to the box body 3 .

[0100] In some embodiments, the box 3 can be used as a part of the chassis structure of the vehicle. For example, part of the box 3 can become at least a part of the floor of the vehicle, or part of the box 3 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0101] The embodiment of the present application provides an electric device, and the electric device includes a battery device 100 in any one of the embodiments of the present application. The battery device 100 is used to store or provide electric energy.

[0102] Electrical equipment includes, but is not limited to, energy storage devices, mobile phones, tablets, laptops, electric toys, electric tools, vehicles, ships or spacecraft, etc. Vehicles may include battery vehicles and electric cars, electric toys may include battery vehicle toys and electric car toys, etc., fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0103] Energy storage devices include but are not limited to energy storage containers or energy storage cabinets, etc.

[0104] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0105] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom of the vehicle 1000 or at the front or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0106] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0107] In the related art, when a battery device is in use, the temperature of a battery cell in the battery device will rise, and the temperature of the battery cell needs to be controlled. A heat exchange component is used to exchange heat with the battery cell to adjust the temperature of the battery cell. For example, when the battery cell heats up during operation, the heat exchange component absorbs the heat of the battery cell to dissipate heat and cool the battery cell. When the external ambient temperature is low and the battery cell needs to be heated, the heat exchange component releases heat to the battery cell. However, the mass of the heat exchange component is relatively large, which increases the weight of the battery device.

[0108] In view of this, an embodiment of the present application provides a battery device, which includes a box, at least two battery cells and a heat exchange assembly. At least two battery cells are arranged in the box; the heat exchange assembly includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part, at least one heat exchange part is set as a rigid part, the flexible part and the rigid part are stacked to form a medium flow channel, the medium flow channel is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells; the flexible part is a layered structure, the flexible part includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Among them, the rigid part is configured as a part of the box.

[0109] In the battery device provided by the embodiment of the present application, the heat exchange component is used to exchange heat with the battery cell. By setting the heat exchange component to include a flexible part and a rigid part, the weight of the flexible part is relatively light, which is conducive to reducing the weight of the heat exchange component, reducing the production cost of the heat exchange component, and reducing the weight of the battery device. The flexible part and the rigid part are stacked to form at least one medium flow channel. The rigid part can support the flexible part, which is conducive to improving the overall structural strength and stability of the heat exchange component and improving the applicability of the heat exchange component. The rigid part is configured as a part of the box body, that is, the rigid part is used to stack with the flexible part to form the medium flow channel, and the rigid part is used to form the box body. Such a design can reduce the number of parts of the battery device and is conducive to reducing the weight of the battery device. The flexible part stacked in sequence by the metal layer and the non-metal layer is thin in thickness and light in weight, and by forming the medium flow channel between the flexible part and the rigid part, it is not affected by the extrusion process and does not need to meet the larger thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0110] The battery device 100 provided in the embodiment of the present application is further described below in conjunction with the accompanying drawings. Figures 2 to 7 An embodiment of the present application provides a battery device 100, including a box body 3, at least two battery cells 1 and a heat exchange component 2.

[0111] At least two battery cells 1 are arranged in the box 3; the heat exchange assembly 2 includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part 21, and at least one heat exchange part is set as a rigid part 22. The flexible part 21 and the rigid part 22 are stacked to form a medium flow channel 2a, and the medium flow channel 2a is used to conduct the heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1; the flexible part 21 is a layered structure, and the flexible part 21 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. Among them, the rigid part 22 is configured as a part of the box 3.

[0112] The box body 3 can be used to contain the battery cell 1 and other structural parts, provide protection for the battery cell 1 and other structural parts, and reduce the impact of foreign matter outside the box body 3 on the charging or discharging of the battery cell 1.

[0113] The flexibility in the flexible part 21 refers to the material properties of the structure. This type of property can be a property given to the material due to its light weight, or a property given to the material due to at least one of the material's thickness, stiffness, strength, elastic modulus, elongation at break, etc. As an example, the material of the flexible part 21 can be selected to be a material that is lighter than conventional aluminum plates, steel plates, etc., and its flexibility can be controlled by the thickness, width, length, and type of material of the flexible part 21. The embodiment of the present application helps to reduce the weight of the heat exchange component 2 by configuring the heat exchange component 2 to include the flexible part 21.

[0114] The rigidity in the rigid part 22 refers to the material property of the structure. This type of property can be a property given to the material due to its heavy mass, or a property given to the material due to at least one of the material's thickness, stiffness, strength, elastic modulus, elongation at break, etc. As an example, the material of the rigid part 22 can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a material of a structure such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part 22. The embodiment of the present application can support the flexible part 21 by configuring the heat exchange component 2 to include the rigid part 22, which is beneficial to improving the overall structural strength and stability of the heat exchange component 2.

[0115] After the rigid part 22 is manufactured and formed, that is, after plastic deformation is completed, it can basically maintain its shape without change under normal use. After the flexible part 21 is manufactured and formed, that is, after plastic deformation is completed, it can undergo elastic deformation, that is, change its shape under normal use.

[0116] By configuring the heat exchange component 2 to include the flexible component 21 and the rigid component 22 , the heat exchange component 2 can have a flexible function and also have a certain structural strength.

[0117] The flexible member 21 and the rigid member 22 are stacked to form the medium flow channel 2a, which means that the heat exchange assembly 2 forms the medium flow channel 2a between the flexible member 21 and the rigid member 22. In other words, the flexible member 21 constitutes at least part of the side wall of the medium flow channel 2a, and the rigid member 22 also constitutes at least part of the side wall of the medium flow channel 2a. The heat exchange medium circulates in the medium flow channel 2a to achieve heat exchange with the battery cell 1.

[0118] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can have a heat exchange effect on the battery cell 1, for example, it can be gaseous or liquid. In the embodiment of the present disclosure, the heat exchange medium is described as a cooling liquid.

[0119] It should be noted that the specific number of the medium flow channels 2a is not limited here, and can be one or more.

[0120] The heat exchange assembly 2 includes at least two heat exchange elements, that is, the number of the heat exchange elements is multiple.

[0121] At least one heat exchange component is configured as a flexible component 21, which means that the number of the flexible components 21 is one or more. In the embodiment where multiple heat exchange components are configured as flexible components 21, the flexible components 21 may be the same or different.

[0122] At least one heat exchange component is configured as a rigid component 22, which means that the number of the rigid components 22 is one or more. In the embodiment where multiple heat exchange components are configured as rigid components 22, the rigid components 22 may be the same or different.

[0123] 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 .

[0124] Exemplarily, the rigid member 22 is a rigid plate-like structure, which can support the flexible member 21 , thereby facilitating improving the overall structural strength and stability of the heat exchange assembly 2 .

[0125] As an example, the heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1 .

[0126] The heat exchange assembly 2 is disposed on the bottom side X2 of at least two battery cells 1 , which means that the heat exchange assembly 2 is located on a side of the at least two battery cells 1 close to the ground.

[0127] It should be noted that the top side X1 and the bottom side X2 are two opposite sides of the top-bottom direction X, and usually the bottom side X2 faces the ground, and the top side X1 faces the sky.

[0128] The heat exchange assembly 2 is integrated into the box 3, that is, the heat exchange assembly 2 is connected to the box 3 or the heat exchange assembly 2 can be a part of the structure of the box 3. In this way, the box 3 can provide support for the heat exchange assembly 2, which is conducive to improving the overall structural strength and stability of the battery device 100.

[0129] As an example, the heat exchange assembly 2 and the housing 3 may be connected in a non-detachable connection or a detachable connection.

[0130] Unless otherwise stated, in the present application, non-detachable connections include but are not limited to welding and / or bonding, etc., and detachable connections include but are not limited to screw connections, bolt connections and / or clamping, etc.

[0131] As an example, the heat exchange component 2 is a part of the structure of the box body 3, which means that the heat exchange component 2 constitutes a part of the side wall of the box body 3. For example, the rigid member 22 can constitute the bottom wall and / or the peripheral side wall of the box body 3, etc.

[0132] A layered structure refers to a structure in which a single layer or multiple layers are spread out in a flat or curved form, and the multiple layers can be parallel to each other or stacked regularly.

[0133] Here, the flexible member 21 includes a metal layer and a non-metal layer, that is, a composite material member composed of a metal layer and a non-metal layer.

[0134] Exemplarily, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0135] Here, the number of metal layers and non-metal layers is not limited.

[0136] In the battery device 100 provided in the embodiment of the present application, the heat exchange component 2 is used to exchange heat with the battery cell 1. By setting the heat exchange component 2 to include a flexible part 21 and a rigid part 22, the weight of the flexible part 21 is relatively light, which is conducive to reducing the weight of the heat exchange component 2, reducing the production cost of the heat exchange component 2, and reducing the weight of the battery device 100. The flexible part 21 and the rigid part 22 are stacked to form at least one medium flow channel 2a. The rigid part 22 can support the flexible part 21, which is conducive to improving the overall structural strength and stability of the heat exchange component 2 and improving the applicability of the heat exchange component 2. The rigid part 22 is configured as a part of the box 3, that is, the rigid part 22 is used to stack with the flexible part 21 to form the medium flow channel 2a, and the rigid part 22 is used to constitute the box 3. Such a design can reduce the number of components of the battery device 100 and help reduce the weight of the battery device 100. The flexible member 21, which is formed by stacking metal layers and non-metal layers in sequence, is thin and light in weight, and by forming a medium flow channel 2a between the flexible member 21 and the rigid member 22, it is not affected by the extrusion process and does not need to meet a large thickness requirement, so the overall thickness and weight of the heat exchange component 2 can be reduced. In addition, the heat exchange component 2 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0137] The shape of the box 3 is not limited. For example, the box 3 can be a simple three-dimensional structure such as a single hexahedron, a cylinder, or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as hexahedrons, cylinders, or spheres. In one example, the box 3 can be a rectangular parallelepiped, and the length and width directions of the box 3 are parallel to the horizontal plane, and the length direction of the box 3 is parallel to the longest side of the rectangular parallelepiped.

[0138] 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.

[0139] Exemplarily, the heat exchange component 2 also includes an inlet and an outlet, both of which are connected to the medium flow channel 2a. Here, the inlet and outlet of the heat exchange component 2 are used to connect to the pipeline of the air conditioning system or water tank of the vehicle or electrical device.

[0140] For example, see Figure 3 and Figure 6 The heat exchange component 2 also includes a connecting member 23 having an inlet and a connecting member 23 having an outlet, and the connecting member 23 is connected to the rigid member 22.

[0141] The material of the connecting member 23 includes but is not limited to metal or plastic.

[0142] For example, the connection member 23 is connected to the rigid member 22 by soldering.

[0143] Exemplarily, the connection member 23 is, for example, a faucet.

[0144] The principle of heat exchange of the heat exchange component 2 for the battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 2a through the inlet of the heat exchange component 2, and after the heat exchange medium exchanges heat with the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heat exchange of the battery cell 1.

[0145] Here, the heat exchange component 2 performs heat exchange on the battery cell 1 to dissipate heat from the battery cell 1 or to heat the battery cell 1 .

[0146] The principle of heat exchange component 2 to dissipate heat for battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2. After the heat exchange medium absorbs the heat generated by the battery cell 1 during operation, the heat exchange medium flows out through the outlet of the heat exchange component 2 to release the heat, thereby completing the cooling and heat dissipation of the battery cell 1.

[0147] The principle of the heat exchange component 2 heating the battery cell 1 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 2a through the inlet of the heat exchange component 2, and the heat exchange medium transfers heat to the battery cell 1. After heating the battery cell 1, the heat exchange medium flows out through the outlet of the heat exchange component 2, completing the heating of the battery cell 1.

[0148] In some embodiments, the elongation at break of the flexible member 21 is greater than the elongation at break of the rigid member 22 .

[0149] Elongation at break is the percentage of the elongation of a material when it breaks to its original length. It is used to measure the deformation capacity that a material can withstand during the stretching process, that is, the elongation at break indicates the ductility of the material when it is stretched under stress.

[0150] The elongation at break of the flexible part 21 is greater than that of the rigid part 22 . In other words, when stretched, the ductility of the flexible part 21 is greater than that of the rigid part 22 , which is beneficial to improving the impact resistance, buffering performance and anti-puncture capability of the heat exchange component 2 .

[0151] For example, the elongation at break of the flexible member 21 and the rigid member 22 may be measured by a tensile test or a drop weight test at room temperature and pressure. The measuring instrument may include a universal testing machine.

[0152] In some embodiments, the elongation at break of the flexible member 21 is in the range of 30% to 300%.

[0153] The elongation at break of the flexible member 21 may be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or any value therebetween.

[0154] In this embodiment, by setting the elongation at break of the flexible member 21 to be in the range of 30% to 300%, the flexible member 21 can have certain impact resistance and puncture resistance as well as certain structural strength.

[0155] In some embodiments, the elongation at break of the rigid member 22 is in a range of 1% to 50%.

[0156] The elongation at break of the rigid member 22 may be any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50% or any value therebetween.

[0157] In this embodiment, by setting the elongation at break of the rigid member 22 to be in the range of 1% to 50%, the rigid member 22 can have sufficient structural strength, thereby facilitating improving the overall structural strength of the heat exchange assembly 2 .

[0158] In some embodiments, the elastic modulus of at least a portion of the flexible member 21 is smaller than the elastic modulus of the rigid member 22 .

[0159] Here, the elastic modulus of a partial area of ​​the flexible member 21 may be smaller than the elastic modulus of the rigid member 22 , or the elastic modulus of the entire area of ​​the flexible member 21 may be smaller than the elastic modulus of the rigid member 22 .

[0160] In this way, the heat exchange component 2 can have a certain structural strength while having a flexible function.

[0161] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to force within a certain range. It is one of the basic physical quantities of a material. The larger the elastic modulus, the greater the stiffness of the material and the greater its compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0162] The elastic modulus of the flexible member 21 and the rigid member 22 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0163] For example, the elastic modulus of the flexible component 21 and the rigid component 22 can be measured at room temperature and pressure by nanoindentation. The nanoindentation method uses a tiny indenter to indent the surface of the flexible component 21 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0164] For some examples, see Figure 2 and Figure 3 The flexible member 21 is connected to a side of the rigid member 22 away from at least two battery cells 1 , and at least two battery cells 1 are connected to the rigid member 22 .

[0165] As an example, the flexible member 21 is connected to the bottom side X2 of the rigid member 22 , and the flexible member 21 is located on a side of the rigid member 22 away from the battery cell 1 .

[0166] At least two battery cells 1 are connected to the rigid member 22 , and two, three or more battery cells 1 may be connected to the rigid member 22 . Exemplarily, all battery cells 1 are connected to the rigid member 22 .

[0167] The manner of connecting the battery cell 1 and the rigid member 22 is not limited, and the battery cell 1 can be connected to the rigid member 22 via a heat-conducting structure.

[0168] The heat-conducting structure refers to a structure made of a good thermal conductor. For example, the thermal conductivity of the heat-conducting structure is not less than 30 W / (m·K). The heat-conducting structure has good thermal conductivity and connection function. The heat-conducting structure can establish a heat conduction path between the rigid part 22 and the battery cell 1 to improve the heat exchange efficiency.

[0169] The specific material of the heat-conducting structure is not limited. By way of example, the heat-conducting structure includes but is not limited to heat-conducting structural adhesive and the like.

[0170] In this embodiment, at least two battery cells 1 are connected to the rigid member 22, which can more stably support the battery cells 1, and the flexible member 21 is connected to the side of the rigid member 22 away from the at least two battery cells 1, which reduces the risk of the battery cells 1 contacting and squeezing the flexible member 21 to a certain extent. The rigid member 22 has good structural strength, can withstand relatively large assembly forces, and maintain its shape unchanged.

[0171] For some examples, see Figure 3 The rigid member 22 may be a flat plate structure with both sides being flat along the thickness direction.

[0172] In this embodiment, the rigid member 22 has a simple structure and is easy to manufacture and form. For example, the rigid member 22 can be formed by a process such as extrusion.

[0173] For some examples, see Figure 2 and Figure 6 Part of the rigid member 22 protrudes toward a side away from the at least two battery cells 1 to form a recessed area 22 a , and the at least two battery cells 1 are located in the recessed area 22 a .

[0174] As an example, a portion of the rigid member 22 protrudes toward the bottom side X2 to form a recessed area 22 a .

[0175] Exemplarily, at least two battery cells 1 may be bonded to the top surface of the recessed area 22 a .

[0176] In this embodiment, the recessed area 22 a is helpful for limiting the position of at least two battery cells 1 , thereby facilitating the assembly of the battery cells 1 and the rigid component 22 .

[0177] In some embodiments, the flexible member 21 may also be connected to the top side X1 of the rigid member 22, and the flexible member 21 may abut the battery cell 1. The flexible member 21 has a certain flexibility and can better fit with the battery cell 1, thereby facilitating the absorption of the assembly tolerance of the heat exchange component 2. No or less caulking agent and heat conductive material may be used between the flexible member 21 and the battery cell 1, thereby improving the fit between the heat exchange component 2 and the battery cell 1, thereby improving the heat exchange effect of the heat exchange component 2.

[0178] For some examples, see Figures 2 to 7 The box body 3 includes a box body, the rigid member 22 includes an avoidance area 221 and a main body area 222, the avoidance area 221 surrounds the outer periphery of the main body area 222, and takes the plane perpendicular to the top and bottom direction X as the projection surface. The projection of the flexible member 21 is located within the projection range of the main body area 222. The flexible member 21 and the main body area 222 define a medium flow channel 2a, the avoidance area 221 is connected to the box body, and the rigid member 22 and the box body jointly define a accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity.

[0179] The avoidance zone 221 surrounds the outer circumference of the main body zone 222 . The avoidance zone 221 may be substantially annular and surround the main body zone 222 .

[0180] Taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the flexible member 21 is located within the projection range of the main area 222 , that is, the projection of the flexible member 21 does not overlap with the projection of the avoidance area 221 . In other words, the projection of the avoidance area 221 surrounds the projection of the flexible member 21 .

[0181] In this embodiment, the rigid part 22 and the box body jointly define a accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity. The rigid part 22 is a partial side wall of the box body 3, which plays a role in protecting the battery cells 1. The size of the flexible part 21 is smaller than that of the rigid part 22. The flexible part 21 is within the range of the main area 222, and the flexible part 21 is basically not in contact with the avoidance area 221, thereby reducing the impact on the flexible part 21 during the assembly process of the avoidance area 221 and the box body.

[0182] For some examples, see Figure 4 and Figure 5 The rigid member 22 may be a flat plate structure with both sides being flat along the thickness direction, and the rigid member 22 may be virtually divided into an avoidance area 221 and a main body area 222 by a dotted line L or a solid line.

[0183] For some examples, see Figure 6 and Figure 7 , the main body area 222 may be a recessed area 22a, that is, taking the plane perpendicular to the top-bottom direction X as the projection plane, the projection of the recessed area 22a coincides with the projection of the main body area 222, and the main body area 222 and the avoidance area 221 are in a step structure along the thickness direction of the rigid part 22. In this way, the main body area 222 and the avoidance area 221 may have a significant difference in shape.

[0184] In some cases, the housing and the heat exchange component are connected by welding. Taking friction stir welding as an example, the temperature of friction stir welding is relatively high and may be much higher than the melting point of the flexible part. For example, the melting point of the flexible part may be between 140°C and 180°C, which may cause the high-temperature melting of the flexible part formed by welding.

[0185] In some embodiments, the avoidance area 221 is welded to the box body. Figure 4 , Figure 4 The avoidance area 221 in the welding process is used for welding.

[0186] As an example, the avoidance area 221 and the tank body may be welded by friction stir welding (FSW, Friction Stir Welding).

[0187] In one example, the width of the avoidance area 221 is between 5 mm and 15 mm, and the size of the welding area may be between 3 mm and 8 mm.

[0188] In this embodiment, the avoidance area 221 is welded to the box body. Since the projection of the flexible part 21 is located within the projection range of the main area 222, during the welding process of the avoidance area 221 and the box body, the distance between the welding position and the flexible part 21 is greater than zero, and the high welding temperature will not directly act on the flexible part 21, thereby reducing the risk of local melting of the flexible part 21 during the welding process.

[0189] It should be noted that the unit "°C" is degrees Celsius.

[0190] In some cases, the box body and the heat exchange assembly 2 are connected by screws, and the high temperature caused by the high-speed rotation of the screws may also melt the flexible part 21.

[0191] In some embodiments, the avoidance area 221 is connected to the box body by fasteners. Figure 5 , Figure 5 The avoidance area 221 in the embodiment is used for fastener connection.

[0192] Fasteners include but are not limited to screws or bolts and the like.

[0193] In one example, the width of the avoidance zone 221 is between 5 mm and 10 mm.

[0194] As an example, the avoidance area 221 and the box body can be connected by fasteners using a flow drill screw process (Flow Drill Screw, ‌FDS).

[0195] In this embodiment, since the projection of the flexible part 21 is located within the projection range of the main area 222, during the fastening and assembly process of the avoidance area 221 and the box body, the distance between the fastener and the flexible part 21 is greater than zero, and the high temperature generated during the high-speed rotation of the fastener will not directly act on the flexible part 21, thereby reducing the risk of local melting of the flexible part 21 during the connection process through the fastener.

[0196] In some embodiments, the width of the avoidance zone 221 is between 5 mm and 15 mm. Preferably, the width of the avoidance zone 221 is between 10 mm and 15 mm.

[0197] Exemplarily, the width dimension of the avoidance zone 221 is any one of 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 11 mm, 12 mm, 14 mm and 15 mm, or any value between any two of them.

[0198] The width of the avoidance area 221 refers to the distance between the boundary line between the avoidance area 221 and the main area 222 and the edge line of the avoidance area 221 .

[0199] In this embodiment, the width of the avoidance area 221 is moderate, which not only has sufficient space for connection with the box body 3 to avoid the flexible member 21, but also can avoid occupying the area of ​​the main body area 222 as much as possible. The main body area 222 retains sufficient area to form the medium flow channel 2a, taking into account the heat exchange requirements.

[0200] It should be noted that the unit "mm" means millimeter.

[0201] For some examples, see Figure 2 and Figure 3 The box body 3 includes a box body and a bottom guard plate 33. The box body includes an annular frame 31 and a top cover 32. The annular frame 31 has a top opening and a bottom opening. The rigid member 22 is connected to the annular frame 31 and closes the bottom opening; the top cover 32 closes the top opening of the annular frame 31; the top cover 32, the annular frame 31 and the rigid member 22 jointly define a accommodating cavity, and at least two battery cells 1 are located in the accommodating cavity; the bottom guard plate 33 is located on the bottom side of the flexible member 21, and the bottom guard plate 33 is connected to the annular frame 31.

[0202] As an example, the rigid member 22 may be welded to the annular frame 31 or connected with fasteners.

[0203] The annular frame 31 may be substantially in the shape of a square ring, a rectangular ring or other ring shapes. In some embodiments, the annular frame 31 may include four side plates, which may be extruded plate-shaped profiles, and the four side plates are sequentially welded along the circumference to form the annular frame 31 .

[0204] The accommodating cavity may be a sealed space or a non-sealed space.

[0205] The top cover 32 may be welded to the annular frame 31 or connected with fasteners.

[0206] The bottom guard plate 33 may be welded to the annular frame 31 or connected with fasteners.

[0207] In this embodiment, the annular frame 31 and the top cover 32 can be manufactured separately and then assembled into the box body. The rigid member 22 and the box body together define a receiving cavity. At least two battery cells 1 are located in the receiving cavity. The rigid member 22 is a part of the side wall of the box body 3 and plays a role in protecting the battery cells 1. The bottom guard plate 33 is located on the bottom side of the flexible member 21. The bottom guard plate 33 can protect the flexible member 21 and prevent objects outside the box body 3 from contacting the flexible member 21.

[0208] In some embodiments, the box body 3 includes a box body, which is open to the bottom side, and the heat exchange assembly 2 closes the bottom side opening of the box body to jointly define a receiving cavity, and at least two battery cells 1 are located in the receiving cavity.

[0209] As an example, a bottom guard plate 33 may be provided on the bottom side X2 of the heat exchange assembly 2 , and the bottom guard plate 33 is connected to the box body. In this way, the bottom guard plate 33 may protect the flexible member 21 .

[0210] As an example, a portion of the rigid member 22 protrudes toward the bottom side X2 to form a recessed area 22a, and the rigid member 22 closes the bottom opening of the box body. In other words, the box body and the rigid member 22 can be relatively buckled to define a receiving cavity.

[0211] The recessed area 22a may be formed by the plate-shaped rigid member 22 through a stamping process.

[0212] In this embodiment, the heat exchange assembly 2 closes the bottom opening of the box body, and the rigid member 22 serves as the bottom wall of the box body 3, which can reduce the weight of the entire package of the battery device 100.

[0213] 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.

[0214] That is to say, the flexible member 21 and the rigid member 22 are connected by hot pressing, and the hot pressing area and the medium flow channel 2a are formed by hot pressing. This molding method is simple.

[0215] 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.

[0216] 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.

[0217] Exemplarily, the heat-pressing area includes a heat-sealing area and a non-heat-sealing area, and the non-heat-sealing area and the medium flow channel 2a are respectively located on both sides of the heat-sealing area, which is conducive to reducing the width of the heat-sealing area, improving the problem of excessive temperature caused by the heat-sealing area being too wide, affecting the heat-pressing quality and damaging the flexible member 21. In addition, the non-heat-sealing area can also form a buffer zone for stress release when the flexible member 21 is folded, improving the situation where stress concentration occurs in the heat-sealing area and causes damage to the heat-sealing area.

[0218] In the related art, the heat exchange component is formed by welding two pieces of high-strength aluminum alloy. However, since high-strength aluminum alloy (5 series, 6 series, etc.) has a high alloy content, alloy elements will precipitate during welding, affecting the welding quality.

[0219] In the embodiment of the present application, the heat exchange component 2 is configured to include a flexible part 21 and a rigid part 22, and the flexible part 21 and the rigid part 22 are hot pressed to form a hot pressing area and a medium flow channel 2a. The hot pressing temperature (150°C ± 10°C) is lower than the brazing temperature in the related art, and alloy elements will not precipitate, which is beneficial to further improve the structural strength of the heat exchange component 2.

[0220] In some embodiments, the flexible member 21 is in the form of a single-layer or multi-layer film.

[0221] In some embodiments, the flexible member 21 includes a metal plastic film.

[0222] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer.

[0223] In this embodiment, since the metal plastic film is thin and light in weight, and the medium flow channel 2a is formed between the metal plastic film and the rigid member 22, it is not affected by the extrusion process and does not need to meet the large thickness requirement, so the overall thickness and weight of the heat exchange component 2 can be reduced. At the same time, since the metal plastic film has the characteristics of insulation and heat exchange medium corrosion resistance, the possibility of insulation failure can be reduced, and the risk of the heat exchange component 2 reacting with the heat exchange medium flowing inside is also reduced, further reducing the possibility of corrosion and leakage of the heat exchange medium.

[0224] In some embodiments, the flexible member 21 includes an aluminum-plastic film.

[0225] In this embodiment, the flexible member 21 is made of aluminum-plastic film, which has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation, and meets insulation and corrosion protection requirements.

[0226] 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 .

[0227] That is, the non-metal layer is located between the metal layer and the rigid member 22 .

[0228] Here, by arranging the non-metallic layer on the side of the metal layer facing the rigid part 22 , the non-metallic layer can be connected to the rigid part 22 through hot pressing.

[0229] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil.

[0230] 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.

[0231] In some embodiments, the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0232] 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.

[0233] Exemplarily, a non-metallic layer of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, an additive may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0234] In some embodiments, the non-metallic layer is a hot-melt layer.

[0235] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of a hot-melt material, it is advantageous to combine the non-metallic layer with the metal layer through hot melting, which makes molding simple and the production efficiency high.

[0236] In some embodiments, the thickness of the flexible member 21 is 0.05 mm-0.3 mm.

[0237] 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.

[0238] In this embodiment, by setting the thickness of the flexible part 21 to 0.05mm-0.3mm, the heat exchange component 2 made of the flexible part 21 has a certain structural strength while making the overall thickness of the heat exchange component 2 smaller, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0239] In some embodiments, the thickness of the flexible member 21 is 0.08 mm-0.2 mm.

[0240] 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.

[0241] In this embodiment, by setting the thickness of the flexible part 21 to 0.08mm-0.2mm, the heat exchange component 2 made of the flexible part 21 has a certain structural strength, and the overall thickness of the heat exchange component 2 is further reduced, which is beneficial to further reduce the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0242] In some embodiments, the elastic modulus of the flexible member 21 is 0.1 MPa-10000 MPa.

[0243] Exemplarily, the elastic modulus of the flexible member 21 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0244] 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.

[0245] In some embodiments, the rigid member 22 is configured as a metal plate.

[0246] By way of example, it may be an aluminum alloy.

[0247] 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.

[0248] In some embodiments, the medium flow channel 2 a includes a plurality of sub-flow channels, each battery cell 1 corresponds to a plurality of sub-flow channels, and an extension direction of the sub-flow channels corresponding to the battery cell 1 is perpendicular to a length direction of the battery cell 1 .

[0249] A plurality of sub-flow channels are connected to form a medium flow channel 2a.

[0250] The extension direction of the sub-channels is perpendicular to the length direction of the battery cell 1 , that is, the multiple sub-channels are arranged along the length direction of the battery cell 1 , so that the length direction of the battery cell 1 corresponds to the multiple sub-channels.

[0251] It is understandable that the temperature of the heat exchange medium will gradually increase along the flow direction of the heat exchange medium. Therefore, by corresponding each battery cell 1 to multiple sub-flow channels, it is helpful to improve the uniformity of the temperature of the battery cell 1.

[0252] The battery device 100 provided in the present application is further described below with a specific embodiment. Figures 2 to 4 The battery device 100 includes a housing 3, at least two battery cells 1 and a heat exchange assembly 2. At least two battery cells 1 are arranged in the housing 3; the heat exchange assembly 2 is arranged on the bottom side X2 of at least two battery cells 1, and the heat exchange assembly 2 includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part 21, and at least one heat exchange part is set as a rigid part 22. The flexible part 21 and the rigid part 22 are stacked to form a medium flow channel 2a, and the medium flow channel 2a is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with at least two battery cells 1. The rigid part 22 is integrated into the housing 3, the flexible part 21 is connected to the bottom side X2 of the rigid part 22, and at least two battery cells 1 are connected to the rigid part 22. The rigid part 22 includes an avoidance area 221 and a main body area 222. The avoidance area 221 surrounds the outer periphery of the main body area 222, with the plane perpendicular to the top and bottom direction X as the projection surface. The projection of the flexible part 21 is located within the projection range of the main body area 222. The flexible part 21 and the main body area 222 define a medium flow channel 2a, and the avoidance area 221 is connected to the box body 3.

[0253] In this embodiment, the heat exchange assembly 2 is used to exchange heat with the battery cell 1. By setting the heat exchange assembly 2 to include a flexible member 21 and a rigid member 22, the weight of the flexible member 21 is relatively light, which is conducive to reducing the weight of the heat exchange assembly 2, reducing the production cost of the heat exchange assembly 2, and reducing the weight of the battery device 100. The rigid member 22 can improve the structural strength of the heat exchange assembly 2 so that the heat exchange assembly 2 can better carry the battery cell 1. The flexible member 21 and the rigid member 22 are stacked to form at least one medium flow channel 2a. The rigid member 22 can support the flexible member 21, which is conducive to improving the overall structural strength and stability of the heat exchange assembly 2 and improving the applicability of the heat exchange assembly 2. At least two battery cells 1 are connected to the rigid member 22, and the rigid member 22 can support the battery cell 1 more stably. The flexible member 21 is connected to the bottom side X2 of the rigid member 22, which reduces the risk of the battery cell 1 contacting and squeezing the flexible member 21 to a certain extent. The rigid part 22 has good structural strength, can withstand relatively large assembly force, and maintain the shape unchanged. The rigid part 22 is integrated into the box body 3, so that the heat exchange assembly 2 can be firmly assembled to the box body 3 without being damaged. The size of the flexible part 21 is smaller than that of the rigid part 22. The flexible part 21 is within the range of the main area 222, and the flexible part 21 is basically not in contact with the avoidance area 221, thereby reducing the impact on the flexible part 21 during the assembly process of the avoidance area 221 and the box body 3.

[0254] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that: include: Box; At least two battery cells are disposed in the box; A heat exchange assembly, wherein the heat exchange assembly comprises at least two heat exchange parts, at least one of which is configured as a flexible part, and at least one of which is configured as a rigid part, wherein the flexible part and the rigid part are stacked to form a medium flow channel, wherein the medium flow channel is used to conduct a heat exchange medium, and wherein the heat exchange medium is used to exchange heat with the at least two battery cells; wherein the flexible part is a layered structure, wherein the flexible part comprises a metal layer and a non-metal layer, and wherein the metal layer and the non-metal layer are stacked in sequence; Wherein, the rigid component is configured as a part of the box body.

2. The battery device according to claim 1, characterized in that: The flexible member is connected to a side of the rigid member away from the at least two battery cells, and the at least two battery cells are connected to the rigid member.

3. The battery device according to claim 2, characterized in that: A portion of the rigid member protrudes toward a side away from the at least two battery cells to form a recessed area, and the at least two battery cells are located in the recessed area.

4. The battery device according to claim 1, characterized in that: The box body includes a box body, the rigid part includes an avoidance area and a main body area, the avoidance area surrounds the outer periphery of the main body area, and takes a plane perpendicular to the top and bottom directions as a projection surface, the projection of the flexible part is located within the projection range of the main body area, the flexible part and the main body area define the medium flow channel, the avoidance area is connected to the box body, the rigid part and the box body jointly define a accommodating cavity, and the at least two battery cells are located in the accommodating cavity.

5. The battery device according to claim 4, characterized in that: The avoidance area is welded to the box body or connected with a fastener.

6. The battery device according to claim 4, characterized in that: The width of the avoidance zone is between 5 mm and 15 mm.

7. The battery device according to claim 1, characterized in that: The box body comprises a box body and a bottom guard plate, and the box body comprises: An annular frame having a top opening and a bottom opening, wherein the rigid member is connected to the annular frame and closes the bottom opening; The top cover closes the top opening of the annular frame. The top cover, the annular frame and the rigid member jointly define a receiving cavity. The at least two battery cells are located in the receiving cavity. The bottom guard plate is located on the bottom side of the flexible member and is connected to the annular frame.

8. The battery device according to claim 1, characterized in that: The box body comprises a box body, the box body is open toward the bottom side, the rigid member closes the bottom side opening of the box body to jointly define a receiving cavity, and the at least two battery cells are located in the receiving cavity.

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

10. The battery device according to claim 9, characterized in that: The flexible member comprises an aluminum-plastic film.

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

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

13. 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.

14. The battery device according to claim 13, characterized in that: The thickness of the flexible member is 0.08 mm-0.2 mm.

15. 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.

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

17. An electrical equipment, characterized in that: A battery device comprising any one of claims 1 to 16.

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