Battery device and electric equipment

Abstract

The embodiment of the invention provides a battery device and electric equipment. The battery device comprises a box body, a battery monomer group and a heat exchange assembly, heat exchange assemblies are arranged on the two opposite sides of each battery monomer in the first direction, at least one heat exchange assembly is a first heat exchange assembly, at least one heat exchange part of the first heat exchange assembly is a flexible part, at least one heat exchange assembly is a second heat exchange assembly, heat exchange parts of the second heat exchange assembly are rigid parts, the flexible parts are of a layered structure, and the rigid parts are of a rigid structure. The flexible part 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. According to the battery device provided by the embodiment of the invention, on one hand, the expansion force of the battery monomers can be absorbed through the first heat exchange assembly to reduce the transmission of the expansion force to the adjacent battery monomers, and on the other hand, the second heat exchange assembly can provide supporting force and a certain limiting effect; and the possibility that part of the heat exchange assemblies are separated from the battery monomers due to deformation of the flexible parts is reduced.

Description

Technical Field

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

[0002] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to improve the thermal management efficiency of battery cells and improve the reliability of use has become an important research direction in this field. Summary of the invention

[0003] In view of this, embodiments of the present application hope to provide a battery device and an electrical equipment.

[0004] A first aspect of an embodiment of the present application provides a battery device, comprising: a battery cell group, comprising a plurality of battery cells stacked along a first direction; a box body, wherein the battery cell group is arranged in the box body; and a heat exchange assembly, wherein the heat exchange assembly is arranged on opposite sides of each battery cell along the first direction, the heat exchange assembly comprises at least two heat exchange parts, and the at least two heat exchange parts are stacked along the first direction to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cells, wherein at least one of the heat exchange components is a first heat exchange component, and at least one of the heat exchange components of the first heat exchange component is set as a flexible component, and at least one of the heat exchange components is a second heat exchange component, and the heat exchange components of the second heat exchange component are all set as rigid components, and the flexible component is a layered structure, and the flexible component comprises a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0005] In the battery device provided in the embodiment of the present application, heat exchange components are arranged on both sides of the battery cell along the first direction. In this way, the heat exchange area between the battery cell and the heat exchange component is increased, which helps to improve the thermal management efficiency and helps to quickly cool down in the event of thermal runaway. On the other hand, at least one heat exchange component of the first heat exchange component is arranged as a flexible component. The weight of the flexible component is relatively light, which helps to reduce the weight of the heat exchange component and thus improve the energy density of the battery device. On the other hand, the flexible component has a certain flexibility, which can make the heat exchange component fit better with the box and / or the battery cell, improve the thermal management efficiency, and the flexible component can absorb the expansion force of the battery cell through deformation. In particular, in the event of thermal runaway of the battery cell, the flexible component can reduce the transmission of the expansion force to the adjacent battery cell and reduce the probability of thermal runaway spreading. On the other hand, each heat exchange component of the second heat exchange assembly is configured as a rigid component. When the flexible component in the first heat exchange assembly is deformed under pressure, the second heat exchange assembly can provide support and a certain limiting effect for the battery cell, reducing the possibility of partial heat exchange assembly being out of contact with the battery cell due to deformation of the flexible component, thereby helping to improve the reliability of thermal management, especially when thermal runaway occurs, it helps to maintain effective heat dissipation of the battery cell. On the other hand, the flexible component, which is stacked in sequence by metal layers and non-metal layers, is thin in thickness and light in weight. It is not affected by the extrusion process and does not have to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange assembly can be reduced. In addition, the heat exchange assembly will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0006] In some embodiments, the second heat exchange assembly is disposed on at least one side of each of the battery cells along the first direction.

[0007] In this embodiment, by providing a second heat exchange assembly on at least one side of each battery cell along the first direction, a relatively stable supporting force can be provided for at least one side of each battery cell along the first direction, thereby avoiding as much as possible the possibility of the battery cell being out of contact with the heat exchange assembly on both sides along the first direction, thereby further improving the reliability of thermal management.

[0008] In some embodiments, along the first direction, the first heat exchange components and the second heat exchange components are alternately arranged.

[0009] In this embodiment, one side of each battery cell along the first direction can be a first heat exchange component, and the other side can be a second heat exchange component, which helps to balance the absorption of expansion force and the stability of support, thereby further improving the reliability of thermal management.

[0010] In some embodiments, the box body includes two side beams arranged opposite to each other along the first direction, the side beams are used to constrain the battery cell group, and the heat exchange component arranged between the battery cell at the end of the battery cell group along the first direction and the side beams is the first heat exchange component.

[0011] In this embodiment, the heat exchange component arranged between the battery cell group and the side beam is the first heat exchange component. In this way, the first heat exchange component will be able to reduce the transmission of the expansion force of the battery cell to the side beam of the box body, thereby helping to improve the deformation resistance of the side beam and further improve the reliability of the battery device.

[0012] In some embodiments, the battery device includes a fixing member connecting the first heat exchange assembly and the side beam.

[0013] In this embodiment, by providing a fixing part, the stability of the relative position between the first heat exchange component and the side beam can be improved, and the possibility of the first heat exchange component losing contact with the battery cell due to displacement can be reduced, thereby helping to further improve the reliability of thermal management.

[0014] In some embodiments, along the first direction, the side of the fixing member facing the first heat exchange component forms an abutment plane, and the side facing away from the first heat exchange component is fixedly connected to the side beam.

[0015] In this embodiment, by forming an abutment plane on one side of the fixing member facing the first heat exchange component, a stable and uniform supporting force can be provided for the first heat exchange component, thereby improving the deformation resistance of the first heat exchange component and further improving the reliability of the battery device.

[0016] In some embodiments, at least one of the heat exchange components of the first heat exchange assembly is configured as a rigid component.

[0017] In this embodiment, by configuring the first heat exchange component to include a flexible part and a rigid part, the first heat exchange component can have a flexible function and also have a certain structural strength.

[0018] In some embodiments, the box body includes two side beams arranged opposite to each other along the first direction, the side beams are used to constrain the battery cell group, the heat exchange assembly arranged between the battery cell at the end of the battery cell group along the first direction and the side beams is the first heat exchange assembly, and in the first heat exchange assembly, the rigid member is arranged on the side facing the battery cell.

[0019] In this embodiment, the supporting capacity of the first heat exchange assembly for the battery cell can be improved, and the force uniformity of the battery cell can be improved.

[0020] In some embodiments, each of the heat exchange components of the first heat exchange assembly is configured as a flexible component.

[0021] In this embodiment, the ability of the first heat exchange component to absorb expansion force can be further improved.

[0022] In some embodiments, the first heat exchange component includes a support body, and the support body is disposed in the medium flow channel.

[0023] In this embodiment, by providing a support body in the medium flow channel, the possibility of the flexible part of the first heat exchange component being deformed due to pressure, resulting in a reduction in the effective cross-sectional area (the area of ​​the cross section perpendicular to the flow direction of the heat exchange medium) of the medium flow channel or even complete closure can be reduced, thereby improving the reliability of thermal management.

[0024] In some embodiments, along the first direction, at least one end of the support body is fixed to the heat exchange element.

[0025] In this embodiment, by fixing at least one end of the support body to the heat exchange element, the position stability of the support body in the medium flow channel can be improved, and the possibility of the support body changing position and generating resistance during the flow of the heat exchange medium can be reduced.

[0026] In some embodiments, the support body includes a columnar portion and a connecting portion connected to the columnar portion. The connecting portion is disposed on at least one side of the columnar portion along the first direction, and the connecting portion has a connecting plane disposed toward the heat exchange element.

[0027] In this embodiment, the support body includes a columnar portion and a connecting portion. The columnar portion helps to reduce the resistance of the heat exchange medium flow and improve the heat exchange effect, while the connecting portion has a connecting plane, which helps to improve the connection strength between the support body and the heat exchange element.

[0028] In some embodiments, the support body is an elastic structure.

[0029] In this embodiment, the support body is an elastic structure, which can provide support for the flexible member on the one hand, and can also cooperate with the flexible member to deform and absorb the expansion force on the other hand.

[0030] In some embodiments, a plurality of the battery cell groups are distributed along a second direction to form a battery cell array, the first direction intersects with the second direction, and along the second direction, at least the rigid part of the second heat exchange assembly includes: at least two rigid segments and at least one flexible segment, and the flexible segment connects two adjacent rigid segments.

[0031] In this embodiment, the rigid part is configured to include a rigid section and a flexible section. The flexible section can absorb the stress difference in the second direction by deformation. In this way, the possibility of the rigid part being deformed due to the stress difference or losing contact with the battery cell can be reduced, further improving the thermal management reliability.

[0032] In some embodiments, the rigid segments are arranged in a one-to-one correspondence with the battery cells.

[0033] In this embodiment, by arranging the rigid segments in one-to-one correspondence with the battery cell groups, it is helpful to provide better support for the battery cells on the one hand, and it is helpful to enable the flexible segments to fully absorb the stress differences caused by the battery cells on the other hand.

[0034] In some embodiments, in a projection plane perpendicular to the first direction, along the second direction, two ends of the projection of the rigid segment are flush with two ends of the corresponding projection of the battery cell, or two ends of the projection of the rigid segment exceed two ends of the corresponding projection of the battery cell.

[0035] In this embodiment, the rigid segment can completely cover the length range of the battery cell along the second direction, which helps to further enhance the supporting force of the rigid segment on the battery cell.

[0036] In some embodiments, the battery device further includes a buffer member, which is disposed between adjacent battery cells along the second direction, and in a projection plane perpendicular to the first direction, a projection of the flexible segment at least partially overlaps with a projection of the buffer member.

[0037] In this embodiment, a buffer is provided between adjacent battery cells in the second direction, which helps to further improve the reliability of the battery device. Furthermore, the projection of the flexible segment and the projection of the buffer at least partially overlap, so that the stress absorption effect can be further improved through the cooperation between the flexible segment and the buffer.

[0038] In some embodiments, the heat exchange component has an inlet and an outlet connected to the medium flow channel, and the inlet and the outlet are respectively arranged on opposite sides of the heat exchange component along a second direction, and the second direction intersects with the first direction.

[0039] In this embodiment, by arranging the inlet and outlet components on opposite sides of the heat exchange component along the second direction, it helps to reduce the difficulty of arranging the pipelines in the box.

[0040] In some embodiments, the battery device includes an inlet pipeline and an outlet pipeline, the inlet pipeline is connected in series to the inlet pieces of each of the heat exchange components, the outlet pipeline is connected in series to the outlet pieces of each of the heat exchange components, and the inlet end of the inlet pipeline and the outlet end of the outlet pipeline are located on the same side of the battery cell group along the first direction.

[0041] In this embodiment, this pipe connection method helps to make the temperature of the heat exchange medium entering each heat exchange component roughly the same, so as to provide better heat dissipation for each battery cell in the first direction and improve the uniformity of the battery cell temperature. Furthermore, this pipe connection method can achieve the inlet and outlet ends on the same side of the battery cell, that is, on the same side of the box, so that it is convenient to connect with an external heat exchange medium source during actual use.

[0042] In some embodiments, the flexible member comprises a metal plasticized film.

[0043] In this embodiment, since the metal plastic film is thin and light, and a medium flow channel is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced.

[0044] In some embodiments, the flexible member comprises an aluminum-plastic film.

[0045] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0046] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil and steel foil; and / or the non-metal layer includes one or more of polyamide, polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene.

[0047] 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 polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member can have a certain waterproof effect.

[0048] In some embodiments, the non-metallic layer is a hot melt layer.

[0049] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of hot-melt material, it is beneficial to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and has high production efficiency.

[0050] In some embodiments, the thickness of the flexible member is 0.05 mm-0.3 mm.

[0051] 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.

[0052] In some embodiments, the thickness of the flexible member is 0.08 mm-0.2 mm.

[0053] 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.

[0054] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0055] 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 battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the case and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0056] In some embodiments, the rigid member is configured as a metal plate.

[0057] In this embodiment, by setting the rigid member as a metal plate, the metal plate has both good structural strength and good thermal conductivity.

[0058] A second aspect of the embodiments of the present application provides an electrical device, which includes the battery device of the first aspect of the embodiments of the present application.

[0059] The electrical equipment of the embodiment of the present application has all the advantages of the battery device of any of the above embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application; Figure 2 A three-dimensional exploded schematic diagram of a battery device provided in one embodiment of the present application; Figure 3 A schematic diagram of the structure of a heat exchange assembly provided in one embodiment of the present application; Figure 4A schematic structural diagram of a heat exchange assembly provided in one embodiment of the present application from another perspective; Figure 5 for Figure 3 AA cross-sectional diagram of ; Figure 6 A schematic diagram of the structure of a rigid component provided in one embodiment of the present application.

[0061] Description of Reference Numerals 1000, vehicle; 100, battery device; 10, battery cell group; 11, battery cell; 20, box body; 21, side beam; 30, heat exchange assembly; 30a, first heat exchange assembly; 30b, second heat exchange assembly; 31, flexible part; 32, rigid part; 321, rigid section; 322, flexible section; 33, medium flow channel; 34, support body; 341, columnar part; 342, connecting part; 35, inlet part; 36, outlet part; 40, fixing part; 40a, abutting plane; 50, buffer part; 60, inlet pipeline; 61, inlet end; 70, outlet pipeline; 71, outlet end; 200, controller; 300, motor. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0064] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0065] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0066] In the description of the present application, the orientations or positional relationships of “first direction”, “second direction” and “height direction” are based on the orientations or positional relationships shown in the accompanying drawings, wherein the “first direction” is the direction indicated by the arrow L1 in the accompanying drawings, the “second direction” is the direction indicated by the arrow L2 in the accompanying drawings, and the “height direction” is the direction indicated by the arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0069] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0070] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0071] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0072] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0073] In the embodiment of the present application, the battery cell 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.

[0074] The battery cell 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.

[0075] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, 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 to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0076] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0077] 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.

[0078] In some embodiments, the electrode assembly is a laminate structure.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0084] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0085] 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.

[0086] In some embodiments, the battery cell 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 sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating 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.

[0087] As an example, the battery cell 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, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0088] 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.

[0089] 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.

[0090] During the use of the battery device, the battery cells in the battery device will generate heat. If the heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while reducing the weight of the heat exchange component has become an important research direction in this field. In the related art, the battery cells in the battery device are cooled by setting a cooling system in the battery device box. The above-mentioned cooling system may include a plurality of aluminum water-cooling plates laid in the battery device box, and the surfaces of the plurality of water-cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the above-mentioned plurality of water-cooling plates, thereby taking away the heat from the battery cells and cooling the battery cells. However, in the case where the aluminum water-cooling plates in the above-mentioned cooling system are arranged between adjacent cells, if one of the battery cells has thermal runaway, the expansion force may be transmitted to another adjacent battery cell through the aluminum water-cooling plate, resulting in the expansion of thermal runaway.

[0091] In view of this, in order to improve the thermal management efficiency and reduce the probability of thermal runaway diffusion, an embodiment of the present application provides a battery device, which includes a box, a battery cell group and a heat exchange component. The battery cell group includes a plurality of battery cells stacked along a first direction, the battery cell group is arranged in the box, and heat exchange components are arranged on opposite sides of each battery cell along the first direction. The heat exchange component includes at least two heat exchange parts, and at least two heat exchange parts are stacked along the first direction to form at least one medium flow channel. At least one medium flow channel is used to conduct heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell. Among them, at least one heat exchange component is a first heat exchange component, at least one heat exchange component of the first heat exchange component is set as a flexible component, at least one heat exchange component is a second heat exchange component, and the heat exchange components of the second heat exchange component are all set as rigid components, the flexible component is a layered structure, and the flexible component includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0092] In the battery device provided in the embodiment of the present application, heat exchange components are arranged on both sides of the battery cell along the first direction. In this way, the heat exchange area between the battery cell and the heat exchange component is increased, which helps to improve the thermal management efficiency and helps to quickly cool down in the event of thermal runaway. On the other hand, at least one heat exchange component of the first heat exchange component is arranged as a flexible component. The weight of the flexible component is relatively light, which helps to reduce the weight of the heat exchange component and thus improve the energy density of the battery device. On the other hand, the flexible component has a certain flexibility, which can make the heat exchange component fit better with the box and / or the battery cell, improve the thermal management efficiency, and the flexible component can absorb the expansion force of the battery cell through deformation. In particular, in the event of thermal runaway of the battery cell, the flexible component can reduce the transmission of the expansion force to the adjacent battery cell and reduce the probability of thermal runaway spreading. On the other hand, each heat exchange component of the second heat exchange assembly is configured as a rigid component. When the flexible component in the first heat exchange assembly is deformed under pressure, the second heat exchange assembly can provide support and a certain limiting effect for the battery cell, reducing the possibility of partial heat exchange assembly being out of contact with the battery cell due to deformation of the flexible component, thereby helping to improve the reliability of thermal management, especially when thermal runaway occurs, it helps to maintain effective heat dissipation of the battery cell. On the other hand, the flexible component, which is stacked in sequence by metal layers and non-metal layers, is thin in thickness and light in weight. It is not affected by the extrusion process and does not have to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange assembly can be reduced. In addition, the heat exchange assembly will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0093] The technical solution described in the embodiments of the present application is applicable to an electric device using a battery device. The electric device includes a battery device in any embodiment of the present application, and the battery device is used to provide electric energy.

[0094] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0095] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the battery devices described above, but can also be applied to all electrical equipment and energy storage equipment including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0096] Reference Figure 1 , a controller 200, a motor 300 and a battery device 100 may be arranged inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be arranged at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Reference Figure 2 In order to meet different power requirements, the battery device 100 includes a plurality of battery cells 11, which refer to the smallest unit constituting a battery module or a battery pack. The plurality of battery cells 11 can be connected in series, in parallel or in a hybrid connection, and a hybrid connection refers to a plurality of battery cells 11 that are both connected in series and in parallel. The plurality of battery cells 11 can be directly connected in series, in parallel or in a hybrid connection, and then the whole formed by the plurality of battery cells 11 is accommodated in the box 20; of course, the battery device 100 can also be a plurality of battery cells 11 that are first connected in series, in parallel or in a hybrid connection to form a battery module, and then the plurality of battery modules are connected in series, in parallel or in a hybrid connection to form a whole, and are accommodated in the box 20. The battery device 100 can also include other structures, for example, the battery device 100 can also include a confluence component for realizing electrical connection between the plurality of battery cells 11. Among them, each battery cell 11 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 11 can be cylindrical, flat, rectangular or in other shapes.

[0098] Reference Figure 2-Figure 6The embodiment of the present application provides a battery device 100, which includes a housing 20, a battery cell group 10 and a heat exchange assembly 30. The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction, the battery cell group 10 is disposed in the housing 20, and heat exchange assemblies 30 are disposed on opposite sides of each battery cell 11 along the first direction, and the heat exchange assembly 30 includes at least two heat exchange members, and at least two heat exchange members are stacked along the first direction to form at least one medium flow channel 33, and at least one medium flow channel 33 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 11. Among them, at least one heat exchange assembly 30 is a first heat exchange assembly 30a, and at least one heat exchange member of the first heat exchange assembly 30a is configured as a flexible member 31, and at least one heat exchange assembly 30 is a second heat exchange assembly 30b, and the heat exchange members of the second heat exchange assembly 30b are all configured as rigid members 32.

[0099] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0100] Please refer to Figure 2 The battery device 100 includes a box body 20 and a battery cell group 10 , and the battery cell group 10 is disposed in the box body 20 .

[0101] The box 20 can be a simple three-dimensional structure such as a single cuboid, a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the box 20 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0102] The box body 20 is used to encapsulate the battery cell 11 , and the box body 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 11 .

[0103] As an example, the box 20 is generally a rectangular parallelepiped structure, the length and width directions of the box 20 are parallel to the horizontal plane, and the length direction of the box 20 is parallel to the longest side of the rectangular parallelepiped structure of the box 20. The height direction of the box 20 is perpendicular to the ground.

[0104] The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction. As an example, the first direction is perpendicular to the large surface of the battery cell 11. The large surface here specifically refers to the surface with the largest area among the surfaces of the battery cell 11. Taking the box body 20 as a rectangular parallelepiped structure as an example, the first direction can be the length direction of the box body 20 or the width direction of the box body 20.

[0105] The battery device 100 may include one or more battery cell groups 10. When the battery device 100 includes multiple battery cell groups 10, the multiple battery cell groups 10 are distributed along a second direction to form a battery cell array. Here, the second direction intersects with the first direction, and both the first direction and the second direction are perpendicular to the height direction of the box body 20. As an example, the first direction is the length direction of the box body 20, and the second direction is the height direction of the box body 20.

[0106] Heat exchange components 30 are disposed on opposite sides of each battery cell 11 along the first direction, that is, heat exchange components 30 are disposed between adjacent battery cells 11 along the first direction, and heat exchange components 30 are also disposed between the battery cells 11 at the end and the box body 20. In this way, the contact area between the heat exchange components 30 and the battery cells 11 is increased as much as possible, thereby improving the heat exchange efficiency.

[0107] As mentioned above, the battery device 100 may include a plurality of battery cell groups 10 distributed along the second direction. In this case, in the projection plane perpendicular to the first direction, a heat exchange assembly 30 may cover only one battery cell 11 or may simultaneously cover a plurality of battery cells 11 distributed along the second direction.

[0108] It should be noted that the battery device 100 may also include other heat exchange structures with heat exchange functions, such as heat exchange structures arranged on the top and / or bottom sides of the battery cell 11, and heat exchange structures arranged on one side or both sides of the battery cell 11 along the second direction.

[0109] The heat exchange assembly 30 includes at least two heat exchange elements, which are stacked in a first direction to form at least one medium flow channel 33 . The at least one medium flow channel 33 is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell 11 .

[0110] At least two heat exchangers are stacked to form at least one medium flow channel 33, which means that the medium flow channel 33 is formed between two adjacent heat exchangers. In other words, one of the two adjacent heat exchangers constitutes at least part of the side wall of the medium flow channel 33, and the other heat exchanger also constitutes at least part of the side wall of the medium flow channel 33. The heat exchange medium circulates in the medium flow channel 33 to achieve heat exchange with the battery cell 11.

[0111] As an example, among two adjacent heat exchangers, one side surface of one heat exchanger facing the other heat exchanger is concave to form a flow channel groove, and the other side surface of the other heat exchanger facing the heat exchanger is a plane, and the plane and the flow channel groove are surrounded to form a medium flow channel 33. Alternatively, the surfaces of the two adjacent heat exchangers facing each other are both concave to form a flow channel groove, and the two flow channel grooves are surrounded to form a medium flow channel 33.

[0112] The medium channel 33 is used to conduct heat exchange medium. 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 11, for example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a coolant.

[0113] The specific number of the medium flow channels 33 is not limited here, and can be one or more.

[0114] The heat exchange assembly 30 may include three or more heat exchange elements. In this case, a medium flow channel 33 may be formed between every two adjacent heat exchange elements.

[0115] The principle of heat exchange of the heat exchange component 30 for the battery cell 11 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 33 through the inlet of the heat exchange component 30, and after the heat exchange medium exchanges heat with the battery cell 11, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heat exchange of the battery cell 11.

[0116] Here, the heat exchange component 30 exchanging heat on the battery cell 11 may be to dissipate heat from the battery cell 11 , or may be to heat the battery cell 11 .

[0117] The principle of heat dissipation of the battery cell 11 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange component 30, and after the heat exchange medium absorbs the heat generated by the battery cell 11 during operation, the heat exchange medium flows out through the outlet of the heat exchange component 30, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell 11.

[0118] The principle of the heat exchange component 30 heating the battery cell 11 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange component 30, and the heat exchange medium transfers heat to the battery cell 11. After heating the battery cell 11, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heating of the battery cell 11.

[0119] The heat exchange assembly 30 includes at least one first heat exchange assembly 30a and at least one second heat exchange assembly 30b. At least one heat exchange component of the first heat exchange assembly 30a is configured as a flexible component 31, and the heat exchange components of the second heat exchange assembly 30b are configured as rigid components 32.

[0120] Here, the flexibility in the flexible member 31 refers to the material property of the structure, and this type of property can be a property given to the material due to the light weight of the material, or a property given to the material due to at least any one of the material's thickness, stiffness, strength, elastic modulus, etc. As an example, the material of the flexible member 31 can be selected to be a material with a lighter weight 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 member 31.

[0121] Specifically, the flexible member 31 is a layered structure, including a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0122] Here, the flexible member 31 includes a metal layer and a non-metal layer, that is, a composite material member composed of the metal layer and the non-metal layer.

[0123] As an example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0124] There is no limit to the number of metal layers and non-metal layers.

[0125] In the embodiment of the present application, the first heat exchange component 30 a is configured to include a flexible member 31 , which helps to reduce the weight of the heat exchange component 30 , thereby improving the energy density of the battery device 100 .

[0126] Furthermore, the flexible part 31 has certain expandable or contractible properties, and it can also be understood that the flexible part 31 can be an elastically deformable structure, and the flexible part 31 has the ability to deform and restore deformation, so that the heat exchange component 30 can adapt to the external contour shape of the battery cell 11 or other components through a certain elastic deformation, so as to improve the fit between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby improving the heat exchange efficiency.

[0127] Furthermore, the above characteristics also enable the flexible member 31 to absorb the expansion force of the battery cell 11 by deformation, thereby improving the reliability of the battery device 100. In particular, when the battery cell 11 is in thermal runaway (when the expansion force will increase significantly), the flexible member 31 can prevent the expansion force of the thermal runaway battery from being transmitted to the adjacent battery cell 11 to a certain extent, thereby reducing the possibility of the adjacent battery cell 11 being damaged by pressure.

[0128] Here, the rigidity in the rigid part 32 refers to the material property of the structure, and this type of property can be a property given to the material due to the heavy mass of the material, or a property given to the material due to at least any one of the material's thickness, rigidity, strength, elastic modulus, etc. As an example, the material of the rigid part 32 can be selected to be a metal plate similar to a conventional aluminum plate, steel plate, or a structural material such as a composite plate, and its rigidity can be controlled by the thickness, width, length, and type of material of the rigid part 32.

[0129] It should be noted that each heat exchange component of the first heat exchange assembly 30a can be set as a flexible component 31, or at least one heat exchange component of the first heat exchange assembly 30a is set as a flexible component 31, and at least one heat exchange component is set as a rigid component 32. In the embodiment where at least one heat exchange component of the first heat exchange assembly 30a is set as a flexible component 31, and at least one heat exchange component is set as a rigid component 32, a medium flow channel 33 is formed between the flexible component 31 and the rigid component 32.

[0130] Furthermore, the present application proposes that if all the heat exchange components 30 are set as first heat exchange components 30a, a situation may occur where, after the flexible parts 31 of a portion of the first heat exchange components 30a are compressed and deformed, there will be a large difference in the pressures applied to each first heat exchange component 30a, causing the flexible parts 31 of some first heat exchange components 30a to lose contact with the battery cells 11 and fail to complete effective heat exchange.

[0131] To this end, in the present embodiment, at least one heat exchange component 30 is configured as a second heat exchange component 30b, and each heat exchange component of the second heat exchange component 30b is configured as a rigid component 32. In this way, the second heat exchange component 30b can play a role in supplementary support and limiting, thereby reducing the possibility of deformation of the flexible component 31 of the first heat exchange component 30a causing the heat exchange component 30 to lose contact with the battery cell 11, thereby improving the reliability of thermal management.

[0132] In this embodiment, the specific setting positions of the first heat exchange component 30a and the second heat exchange component 30b are not limited. Those skilled in the art can specifically choose to use the first heat exchange component 30a or the second heat exchange component 30b according to the stress distribution at each position during actual use.

[0133] In the battery device 100 provided in the embodiment of the present application, heat exchange components 30 are arranged on opposite sides of the battery cell 11 along the first direction. In this way, the heat exchange area between the battery cell 11 and the heat exchange component 30 is increased, which helps to improve the thermal management efficiency and facilitates rapid cooling in the event of thermal runaway.

[0134] On the other hand, at least one heat exchange component of the first heat exchange assembly 30 a is configured as a flexible component 31 . The flexible component 31 is light in weight, which helps to reduce the weight of the heat exchange assembly 30 , thereby improving the energy density of the battery device 100 .

[0135] On the other hand, the flexible part 31 has a certain flexibility, which can make the heat exchange component 30 fit better with the box 20 and / or the battery cell 11, thereby improving the thermal management efficiency. In addition, the flexible part 31 can absorb the expansion force of the battery cell 11 through deformation. Especially in the event of thermal runaway of the battery cell 11, the flexible part 31 can reduce the transmission of the expansion force to the adjacent battery cell 11, thereby reducing the probability of thermal runaway spreading.

[0136] On the other hand, each heat exchange component of the second heat exchange component 30b is configured as a rigid component 32. When the flexible component 31 in the first heat exchange component 30a is compressed and deformed, the second heat exchange component 30b can provide support force and a certain limiting effect for the battery cell 11, thereby reducing the possibility of partial loss of contact between the heat exchange component 30 and the battery cell 11 due to the deformation of the flexible component 31, thereby helping to improve the reliability of thermal management, especially when thermal runaway problems occur, helping to maintain effective heat dissipation of the battery cell 11.

[0137] On the other hand, the flexible member 31, which is formed by stacking metal layers and non-metal layers in sequence, is thin and light in weight, and 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 assembly 30 can be reduced. In addition, the heat exchange assembly 30 will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion leakage.

[0138] In some embodiments, reference Figure 2 A second heat exchange assembly 30b is disposed on at least one side of each battery cell 11 along the first direction.

[0139] Here, the second heat exchange component 30b is provided on at least one side of each battery cell 11 along the first direction, which specifically means that among the two heat exchange components 30 on the opposite sides of each battery cell 11 along the first direction, at least one is the second heat exchange component 30b, and the other can be the first heat exchange component 30a or the second heat exchange component 30b without limitation.

[0140] In this embodiment, by disposing a second heat exchange assembly 30b on at least one side of each battery cell 11 along the first direction, a relatively stable supporting force can be provided for at least one side of each battery cell 11 along the first direction, thereby avoiding as much as possible the possibility that both sides of the battery cell 11 along the first direction are out of contact with the heat exchange assembly 30, thereby further improving the reliability of thermal management.

[0141] In some embodiments, reference Figure 2, along the first direction, the first heat exchange components 30a and the second heat exchange components 30b are alternately arranged.

[0142] In this embodiment, one side of each battery cell 11 along the first direction is the first heat exchange component 30a, and the other side is the second heat exchange component 30b, which helps to balance the absorption of expansion force and the stability of support, thereby further improving the reliability of thermal management.

[0143] In some embodiments, reference Figure 2 The box body 20 includes two side beams 21 arranged opposite to each other along a first direction, the side beams 21 are used to constrain the battery cell group 10, and the heat exchange component 30 arranged between the battery cell 11 at the end of the battery cell group 10 along the first direction and the side beams 21 is a first heat exchange component 30a.

[0144] Here, the side beam 21 is generally referred to as an expansion beam of the box body 20. The side beam 21 is used to constrain the battery cell group 10 along the first direction and bear the expansion force from the battery cell 11.

[0145] It can be understood that the heat exchange components 30 between the two battery cells 11 at both ends of the battery cell group 10 along the first direction and the corresponding side beams 21 are both first heat exchange components 30 a.

[0146] In this embodiment, the heat exchange component 30 arranged between the battery cell group 10 and the side beam 21 is a first heat exchange component 30a. In this way, the first heat exchange component 30a will be able to reduce the transmission of the expansion force of the battery cell 11 to the side beam 21 of the box body 20, thereby helping to improve the deformation resistance of the side beam 21 and further improve the reliability of the battery device 100.

[0147] In some embodiments, reference Figure 2 The battery device 100 includes a fixing member 40 , and the fixing member 40 connects the first heat exchange assembly 30 a and the side beam 21 .

[0148] Here, the specific structural form of the fixing member 40 is not limited, as long as it can achieve relative fixation between the first heat exchange component 30a and the side beam 21.

[0149] In this embodiment, by providing a fixing member 40, the stability of the relative position between the first heat exchange component 30a and the side beam 21 can be improved, and the possibility of the first heat exchange component 30a losing contact with the battery cell 11 due to displacement can be reduced, thereby helping to further improve the reliability of thermal management.

[0150] In some embodiments, reference Figure 2 Along the first direction, one side of the fixing member 40 facing the first heat exchange component 30 a forms abutting plane 40 a , and the other side is fixedly connected to the side beam 21 .

[0151] As an example, in a projection plane perpendicular to the first direction, the projection of the abutting plane 40 a covers the projection of the first heat exchange component 30 a .

[0152] The abutting plane 40a and the first heat exchange component 30a may only abut against each other without being fixedly connected, or the abutting plane 40a may be connected to the first heat exchange component 30a by bonding, welding or the like.

[0153] The specific implementation method of the fixed connection between the fixing member 40 and the side beam 21 is not limited, such as bonding, welding, clamping, fastener connection, etc. The fixing member 40 and the side beam 21 can be directly connected or only connected by other intermediate structures.

[0154] In this embodiment, by forming a supporting plane 40a on one side of the fixing member 40 facing the first heat exchange component 30a, a stable and uniform supporting force can be provided for the first heat exchange component 30a, thereby improving the deformation resistance of the first heat exchange component 30a and further improving the reliability of the battery device 100.

[0155] In some embodiments, reference Figure 5 At least one heat exchange component of the first heat exchange assembly 30a is configured as a rigid component 32.

[0156] As mentioned above, in this embodiment, a medium flow channel 33 is formed between the rigid component 32 and the flexible component 31 of the first heat exchange component 30 a.

[0157] In this embodiment, at least one heat exchange component is configured as a flexible component 31, which means that the number of the flexible components 31 is one or more. In the embodiment where multiple heat exchange components are configured as flexible components 31, the flexible components 31 may be the same or different.

[0158] At least one heat exchange component is configured as a rigid component 32, which means that the number of rigid components 32 is one or more. In the embodiment where multiple heat exchange components are configured as rigid components 32, the rigid components 32 may be the same or different.

[0159] As an example, the first heat exchange component 30a includes two heat exchange parts, one of which is a flexible part 31, and the other is a rigid part 32. As an example, the first heat exchange component 30a includes three or more heat exchange parts, at least two of which are flexible parts 31, or at least two of which are rigid parts 32, and the flexible parts 31 and the rigid parts 32 are arranged alternately.

[0160] In this embodiment, by configuring the first heat exchange component 30a to include a flexible component 31 and a rigid component 32, the first heat exchange component 30a can have a certain structural strength while having a flexible function.

[0161] In the above-mentioned embodiment where the heat exchange assembly 30 disposed between the battery cell 11 and the side beam 21 at the end of the battery cell group 10 along the first direction is a first heat exchange assembly 30a, the first heat exchange assembly 30a may include at least one rigid member 32. In this case, the rigid member 32 of the first heat exchange assembly 30a is disposed on the side facing the battery cell 11.

[0162] In this way, the supporting capacity of the first heat exchange assembly 30 a for the battery cell 11 can be improved, and the force uniformity of the battery cell 11 can be improved.

[0163] It should be noted that, for each first heat exchange assembly 30a disposed between adjacent battery cells 11, the specific orientations of the rigid components 32 and the flexible components 31 are not limited, and the orientations of the rigid components 32 of these first heat exchange assemblies 30a may be the same or different.

[0164] In some embodiments, each heat exchange component of the first heat exchange component 30a may also be configured as a flexible component 31. In this way, the ability of the first heat exchange component 30a to absorb expansion force can be further improved.

[0165] In some embodiments, at least one heat exchange component of a portion of the first heat exchange components 30a may be a flexible component 31 and at least one heat exchange component may be a rigid component 32, and such first heat exchange components 30a may be specifically disposed between the battery cell 11 and the side beam 21. All heat exchange components of another portion of the first heat exchange components 30a are flexible components 31, and such first heat exchange components 30a may be specifically disposed between adjacent battery cells 11 along the first direction.

[0166] In some embodiments, reference Figure 5 The first heat exchange component 30 a includes a support body 34 , and the support body 34 is disposed in the medium flow channel 33 .

[0167] Here, the specific structural form of the support body 34 is not limited. The support body 34 can be a rigid structure or a flexible structure. As an example, the elastic modulus of the support body 34 is greater than the elastic modulus of the flexible part 31 and less than the elastic modulus of the rigid part 32.

[0168] It can be understood that a gap needs to be formed between the support body 34 and the flow channel wall of the medium flow channel 33 for the medium to flow. As an example, the support body 34 is a strip-shaped structure as a whole, and the axis thereof is substantially parallel to the central axis of the medium flow channel 33. At least one end of the support body 34 along the first direction can abut against the heat exchange element, or the opposite ends of the support body 34 along the first direction respectively abut against two heat exchange elements, thereby improving its support effect.

[0169] In this embodiment, by providing a support body 34 in the medium flow channel 33, the possibility of the flexible part 31 of the first heat exchange component 30a being deformed due to pressure, resulting in a reduction in the effective cross-sectional area (the area of ​​the cross section perpendicular to the flow direction of the heat exchange medium) of the medium flow channel 33 or even complete closure can be reduced, thereby improving the reliability of thermal management.

[0170] It should be noted that the support member is applicable to the first heat exchange assembly 30a described in any of the above embodiments, including a first heat exchange assembly 30a in which at least one heat exchange member is a rigid member 32, and also including a first heat exchange assembly 30a in which all heat exchange members are flexible members 31.

[0171] In some embodiments, along the first direction, at least one end of the support body 34 is fixed to the heat exchange element.

[0172] Here, the specific implementation method of fixing the support body 34 and the heat exchange element is not limited, such as bonding, clamping, welding, etc., or the support body 34 and the heat exchange element form an integrated structure.

[0173] The support body 34 may be fixed to the heat exchange element at only one end along the first direction, or at both opposite ends. In comparison, the support body 34 may be fixed to the heat exchange element at one end along the first direction and not fixed at the other end, which helps reduce the difficulty of assembly.

[0174] In this embodiment, by fixing at least one end of the support body 34 to the heat exchange element, the position stability of the support body 34 in the medium flow channel 33 can be improved, and the possibility of the support body 34 changing position and generating resistance during the flow of the heat exchange medium can be reduced.

[0175] In some embodiments, reference Figure 5 The support body 34 includes a columnar portion 341 and a connecting portion 342 connected to the columnar portion 341. Along the first direction, the connecting portion 342 is provided on at least one side of the columnar portion 341, and the connecting portion 342 has a connecting plane disposed toward the heat exchanger.

[0176] In this embodiment, the central axis of the columnar portion 341 coincides with or is parallel to the central axis of the heat exchange medium.

[0177] Here, the connecting portion 342 may be provided on one side of the columnar portion 341 along the first direction, or may be provided on both opposite sides of the columnar portion 341 along the first direction. The connecting plane of the connecting portion 342 may abut against the heat exchange element, or may be further fixed relative to the heat exchange element, and the fixing method is not limited, such as bonding, welding, etc.

[0178] As an example, when connecting parts 342 are provided on opposite sides of the columnar part 341 along the first direction, the connecting plane of one connecting part 342 abuts against the heat exchange component without being relatively fixed, and the connecting plane of the other connecting part 342 is relatively fixed to the heat exchange component, thereby reducing the difficulty of assembly.

[0179] In this embodiment, the support body 34 includes a columnar portion 341 and a connecting portion 342. The columnar portion 341 helps to reduce the resistance of the heat exchange medium flow and improve the heat exchange effect, while the connecting portion 342 has a connecting plane, which helps to improve the connection strength between the support body 34 and the heat exchange element.

[0180] In some embodiments, the support body 34 is an elastic structure.

[0181] Here, the support body 34 is an elastic structure, which means that at least a part of the support body 34 is an elastic structure. In the embodiment in which the support body 34 includes a columnar portion 341 and a connecting portion 342, the columnar portion 341 is an elastic structure, and the connecting portion 342 can be a rigid structure or an elastic structure.

[0182] As an example, the elastic structure herein refers to a structure whose elastic modulus is higher than that of the flexible member 31 and lower than that of the rigid member 32 .

[0183] In this embodiment, the support body 34 is an elastic structure, which can provide support for the flexible member 31 on the one hand, and can also cooperate with the flexible member 31 to deform and absorb the expansion force on the other hand.

[0184] In some embodiments, reference Figure 2 and Figure 6 , multiple battery cell groups 10 are distributed along the second direction to form a battery cell array, the first direction intersects the second direction, and along the second direction, at least the rigid part 32 of the second heat exchange component 30b includes: at least two rigid segments 321 and at least one flexible segment 322, and the flexible segment 322 connects two adjacent rigid segments 321.

[0185] Similar to the flexible member 31, the flexibility in the flexible segment 322 refers to the material property of the structure, and 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, etc. As an example, the material of the flexible segment 322 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 segment 322.

[0186] As an example, the material of the flexible section 322 is the same as the material of the flexible member 31 .

[0187] In this embodiment, at least the rigid part 32 of the second heat exchange assembly 30 b includes a rigid section 321 and a flexible section 322 , which means that each rigid part 32 of the second heat exchange assembly 30 b includes a rigid section 321 and a flexible section 322 .

[0188] In the above-mentioned embodiment where at least one heat exchange component of the first heat exchange component 30 a is configured as a rigid component 32 , the rigid component 32 of the first heat exchange component 30 a may include a flexible segment 322 , or may not include the flexible segment 322 .

[0189] In this embodiment, the specific connection method of the flexible segment 322 and the rigid segment 321 is not limited, such as welding, bonding, etc. As an example, the flexible segment 322 can be connected to one end surface of the rigid segment 321 along the second direction. As another example, a part of the flexible segment 322 can be stacked with the rigid segment 321 along the first direction to increase the contact area between the two, thereby improving the stability of the connection.

[0190] It can be understood that when multiple battery cell groups 10 are distributed along the second direction, there are certain differences in the stress distribution of the heat exchange assembly 30 along the second direction. This stress difference may be caused by different expansion forces of the battery cells 11 and / or different acceleration impacts of each battery cell 11 when the battery device 100 moves. For the flexible part 31, it can absorb this stress difference, but for the rigid part 32, this stress difference may cause it to undergo local deformation and / or cause it to shift and lose contact with certain battery cells 11.

[0191] To this end, in this embodiment, the rigid part 32 is configured to include a rigid section 321 and a flexible section 322. The flexible section 322 can absorb the stress difference in the second direction by deformation. In this way, the possibility of the rigid section 321 of the rigid part 32 being deformed or losing contact with the battery cell 11 due to the stress difference can be reduced, thereby further improving the thermal management reliability.

[0192] In some embodiments, the rigid segments 321 are arranged in a one-to-one correspondence with the battery cells 11. Here, the rigid members 32 and the battery cells 11 are arranged in a one-to-one correspondence specifically means that the number of rigid segments 321 in the rigid member 32 is the same as the number of a row of battery cells 11 distributed along the second direction (that is, the number of battery cell groups 10), and in the projection plane perpendicular to the first direction, the projection of the rigid segments 321 at least partially overlaps with the projection of the corresponding battery cells 11.

[0193] In this embodiment, by arranging the rigid sections 321 in one-to-one correspondence with the battery cell groups 10 , it is helpful to provide better support for the battery cells 11 on the one hand, and to enable the flexible sections 322 to fully absorb the stress differences caused by the battery cells 11 on the other hand.

[0194] In some embodiments, in a projection plane perpendicular to the second direction, along the second direction, two ends of the projection of the rigid segment 321 are flush with two ends of the projection of the corresponding battery cell 11 , or two ends of the projection of the rigid segment 321 exceed two ends of the projection of the corresponding battery cell 11 .

[0195] In this embodiment, the rigid section 321 can completely cover the length range of the battery cell 11 along the second direction, which helps to further enhance the supporting force of the rigid section 321 on the battery cell 11 .

[0196] In some embodiments, reference Figure 2 The battery device 100 further includes a buffer 50 , and the buffer 50 is disposed between adjacent battery cells 11 along the second direction, and in a projection plane perpendicular to the first direction, a projection of the flexible segment 322 at least partially overlaps with a projection of the buffer 50 .

[0197] Here, the buffer member 50 is mainly used to absorb the stress between the adjacent battery cells 11 along the second direction. As an example, the buffer member 50 is an elastic pad structure.

[0198] In this embodiment, a buffer 50 is provided between adjacent battery cells 11 in the second direction, which helps to further improve the reliability of the battery device 100. Furthermore, the projection of the flexible segment 322 and the projection of the buffer 50 at least partially overlap, so that the stress absorption effect can be further improved through the cooperation between the flexible segment 322 and the buffer 50.

[0199] In some embodiments, reference Figure 2 The heat exchange component 30 has an inlet 35 and an outlet 36 connected to the medium flow channel 33. The inlet 35 and the outlet 36 are respectively arranged on opposite sides of the heat exchange component 30 in a second direction, and the second direction intersects with the first direction.

[0200] Here, the inlet member 35 and the outlet member 36 are used to allow the heat exchange medium to flow into and out of the medium flow channel 33, respectively. As an example, the inlet member 35 and the outlet member 36 include water nozzles.

[0201] In this embodiment, by respectively arranging the inlet member 35 and the outlet member 36 on opposite sides of the heat exchange assembly 30 along the second direction, it helps to reduce the difficulty of arranging the pipelines in the box body 20.

[0202] It should be noted that, in some other embodiments, the inlet member 35 and the outlet member 36 may also be located on the same side.

[0203] In some embodiments, still referring to Figure 2The battery device 100 includes an inlet pipeline 60 and an outlet pipeline 70. The inlet pipeline 60 is connected in series to the inlet parts 35 of each heat exchange component 30, and the outlet pipeline 70 is connected in series to the outlet parts 36 of each heat exchange component 30. The inlet end 61 of the inlet pipeline 60 and the outlet end 71 of the outlet pipeline 70 are located on the same side of the battery cell group 10 along the first direction.

[0204] Here, the inlet pipe 60 connected in series with the inlet parts 35 of each heat exchange assembly 30 specifically means that the inlet pipe 60 connects the inlet part 35 of the heat exchange assembly 30 with the inlet part 35 of another adjacent heat exchange assembly 30. The outlet pipe 70 connected in series with the outlet parts 36 of each heat exchange assembly 30 specifically means that the inlet pipe 60 connects the outlet part 36 of the heat exchange assembly 30 with the outlet part 36 of another adjacent heat exchange assembly 30.

[0205] The inlet end 61 of the inlet pipeline 60 specifically refers to an end through which the heat exchange medium flows into the inlet pipeline 60 , and the outlet end 71 of the outlet pipeline 70 specifically refers to an end through which the heat exchange medium flows out of the outlet pipeline 70 .

[0206] The inlet end 61 and the outlet end 71 are specifically disposed between the first heat exchange assembly 30 a and the side beam 21 . In the embodiment where the battery device 100 includes a fixing member 40 , the inlet end 61 and the outlet end 71 are specifically disposed between the fixing member 40 and the side beam 21 .

[0207] In this embodiment, this pipe connection method helps to make the temperature of the heat exchange medium entering each heat exchange assembly 30 roughly the same, so that it helps to provide better heat dissipation for each battery cell 11 in the first direction and improve the uniformity of the temperature of the battery cell 11. Further, this pipe connection method can achieve that the inlet end 61 and the outlet end 71 are located on the same side of the battery cell 11, that is, located on the same side of the box body 20, so that it is convenient to connect with an external heat exchange medium source during actual use.

[0208] In some embodiments, the flexible member 31 includes a metal plasticized film.

[0209] The flexible member 31 is a single-layer or multi-layer film.

[0210] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer (that is, a non-metal layer).

[0211] In this embodiment, since the metal plastic film is thin and light in weight, and a medium flow channel 33 is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange component 30 can be reduced.

[0212] In some embodiments, the flexible member 31 comprises an aluminum-plastic film.

[0213] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0214] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0215] By setting the metal layer to be one or more of aluminum foil, copper foil and steel foil, the flexible member 31 can have a certain structural strength and can play an isolation role.

[0216] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0217] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0218] As an example, a non-metallic layer made 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.

[0219] In some embodiments, the non-metallic layer is a hot melt layer.

[0220] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of hot-melt material, it is beneficial to combine the non-metallic layer and the metal layer through hot melting, which makes molding simple and has high production efficiency.

[0221] In some embodiments, the thickness of the flexible member 31 is 0.05 mm-0.3 mm.

[0222] As an example, the thickness of the flexible member 31 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, 0.3 mm or any value therebetween.

[0223] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength while making the overall thickness of the heat exchange component 30 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.

[0224] In some embodiments, the thickness of the flexible member 31 is 0.08 mm-0.2 mm.

[0225] As an example, the thickness of the flexible member 31 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 therebetween.

[0226] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, and the overall thickness of the heat exchange component 30 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.

[0227] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0228] As an example, the elastic modulus of the flexible member 31 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.

[0229] 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.

[0230] The elastic modulus of the flexible member 31 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.

[0231] For example, the elastic modulus of the flexible member 31 can be measured at room temperature and pressure by a nanoindentation method, which uses a tiny indenter to indent the surface of the flexible member 31 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0232] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange component 30, and has a certain deformation ability, which can improve the fit between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0233] In some embodiments, the elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32. The elongation at break is a percentage of the elongation of the material when it is stretched to break to the original length. It is used to measure the deformation capacity that the material can withstand during the stretching process, that is, the elongation at break indicates the ductility of the material when it is stretched under force.

[0234] The elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32 . In other words, when stretched, the ductility of the flexible member 31 is greater than the ductility of the rigid member 32 .

[0235] In some embodiments, the elongation at break of the flexible member 31 is in a range of 30% to 300%.

[0236] The elongation at break of the flexible member 31 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.

[0237] In this embodiment, by setting the elongation at break of the flexible member 31 to be in the range of 30% to 300%, the flexible member 31 can have certain impact resistance and puncture resistance as well as certain structural strength.

[0238] In some embodiments, the elongation at break of the rigid member 32 is in a range of 1% to 50%.

[0239] The elongation at break of the rigid member 32 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.

[0240] In this embodiment, by setting the elongation at break of the rigid component 32 to be in the range of 1% to 50%, the rigid component 32 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 30.

[0241] In some embodiments, the rigid member 32 is configured as a metal plate.

[0242] As an example, the rigid member 32 may be an aluminum alloy plate, and the outer surface of the plate may be insulated.

[0243] In this embodiment, by setting the rigid member 32 as a metal plate, the metal plate has both good structural strength and good thermal conductivity.

[0244] The battery device 100 provided in the embodiment of the present application is further described below with reference to a specific embodiment.

[0245] Reference Figure 2-Figure 6 The battery device 100 includes a housing 20, a battery cell group 10 and a heat exchange assembly 30. The battery cell group 10 is disposed in the housing 20. The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction. As an example, the first direction is perpendicular to the large surface of the battery cell 11. The plurality of battery cell groups 10 are distributed along a second direction to form a battery cell array. Here, the second direction intersects with the first direction, and both the first direction and the second direction are perpendicular to the height direction of the housing 20.

[0246] A heat exchange assembly 30 is arranged on opposite sides of each battery cell 11 along the first direction. The heat exchange assembly 30 includes at least two heat exchange components. The at least two heat exchange components are stacked in the first direction to form at least one medium flow channel 33. The at least one medium flow channel 33 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell 11.

[0247] At least one heat exchange component 30 is a first heat exchange component 30a, at least one heat exchange part of the first heat exchange component 30a is configured as a rigid part 32, and at least one heat exchange part is configured as a flexible part 31. At least one heat exchange component 30 is a second heat exchange component 30b, and each heat exchange part of the second heat exchange component 30b is configured as a rigid part 32.

[0248] Along the first direction, the first heat exchange component 30a and the second heat exchange component 30b are alternately arranged, wherein the box body 20 includes two side beams 21 arranged opposite to each other along the first direction, and the side beams 21 are used to constrain the battery cell group 10. The heat exchange component 30 arranged between the battery cell 11 at the end of the battery cell group 10 along the first direction and the side beams 21 is the first heat exchange component 30a. In the first heat exchange component 30a, the rigid member 32 is arranged on the side facing the battery cell 11, and the battery device 100 includes a fixing member 40, which connects the first heat exchange component 30a and the side beams 21.

[0249] The first heat exchange component 30a includes a support body 34, which is arranged in the medium flow channel 33. The support body 34 is an elastic structure. The support body 34 includes a columnar portion 341 and a connecting portion 342 connected to the columnar portion 341. Along the first direction, the connecting portion 342 is arranged on at least one side of the columnar portion 341, and the connecting portion 342 has a connecting plane arranged toward the heat exchanger.

[0250] The rigid parts 32 of the first heat exchange assembly 30a and the second heat exchange assembly 30b each include at least two rigid sections 321 and at least one flexible section 322, and the flexible section 322 connects two adjacent rigid sections 321. The rigid sections 321 are arranged one-to-one with the battery cells 11, and a buffer 50 is arranged between two adjacent battery cells 11 along the second direction.

[0251] In the projection plane perpendicular to the first direction, along the second direction, the two ends of the projection of the rigid segment 321 are flush with the two ends of the projection of the corresponding battery cell 11, or, the two ends of the projection of the rigid segment 321 exceed the two ends of the projection of the corresponding battery cell 11, and the projection of the flexible segment 322 at least partially overlaps with the projection of the buffer member 50.

[0252] An embodiment of the present application further provides an electrical device, which includes the battery device 100 as described in any of the above embodiments.

[0253] The electrical equipment of the embodiment of the present application has all the advantages of the battery device 100 described in any of the above embodiments, which will not be described in detail here.

[0254] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0255] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: The battery device comprises: A battery cell group, comprising a plurality of battery cells stacked along a first direction; a box body, wherein the battery cell group is arranged in the box body; and A heat exchange assembly is provided on opposite sides of each battery cell along the first direction, the heat exchange assembly comprises at least two heat exchange members, the at least two heat exchange members are stacked along the first direction to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, the heat exchange medium is used to exchange heat with the battery cell, wherein, At least one of the heat exchange components is a first heat exchange component, at least one of the heat exchange parts of the first heat exchange component is configured as a flexible part, at least one of the heat exchange components is a second heat exchange component, and the heat exchange parts of the second heat exchange component are configured as rigid parts, The flexible member is a layered structure, and includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

2. The battery device according to claim 1, characterized in that: The second heat exchange assembly is disposed on at least one side of each battery cell along the first direction.

3. The battery device according to claim 1, characterized in that: Along the first direction, the first heat exchange components and the second heat exchange components are alternately arranged.

4. The battery device according to claim 1, characterized in that: The box body includes two side beams arranged opposite to each other along the first direction, the side beams are used to constrain the battery cell group, and the heat exchange component arranged between the battery cells at the ends of the battery cell group along the first direction and the side beams is the first heat exchange component.

5. The battery device according to claim 4, characterized in that: The battery device includes a fixing member, and the fixing member connects the first heat exchange component and the side beam.

6. The battery device according to claim 5, characterized in that: Along the first direction, the side of the fixing member facing the first heat exchange component forms an abutting plane, and the side facing away from the first heat exchange component is fixedly connected to the side beam.

7. The battery device according to claim 1, characterized in that: At least one of the heat exchange components of the first heat exchange assembly is configured as a rigid component.

8. The battery device according to claim 7, characterized in that: The box body includes two side beams arranged opposite to each other along the first direction, and the side beams are used to constrain the battery cell group. The heat exchange assembly arranged between the battery cell at the end of the battery cell group along the first direction and the side beams is the first heat exchange assembly, and in the first heat exchange assembly, the rigid part is arranged on the side facing the battery cell.

9. The battery device according to claim 1, characterized in that: Each of the heat exchange components of the first heat exchange assembly is configured as a flexible component.

10. The battery device according to any one of claims 1 to 9, characterized in that: The first heat exchange component includes a support body, and the support body is arranged in the medium flow channel.

11. The battery device according to claim 10, characterized in that: Along the first direction, at least one end of the support body is fixed to the heat exchange element.

12. The battery device according to claim 10, characterized in that: The support body includes a columnar portion and a connecting portion connected to the columnar portion. The connecting portion is disposed on at least one side of the columnar portion along the first direction, and the connecting portion has a connecting plane disposed toward the heat exchange element.

13. The battery device according to claim 12, characterized in that: The support body is an elastic structure.

14. The battery device according to any one of claims 1 to 9 and 11 to 13, characterized in that: A plurality of battery cell groups are distributed along a second direction to form a battery cell array, and the first direction intersects with the second direction. Along the second direction, at least the rigid part of the second heat exchange assembly includes: at least two rigid segments and at least one flexible segment, and the flexible segment connects two adjacent rigid segments.

15. The battery device according to claim 14, characterized in that: The rigid sections are arranged in one-to-one correspondence with the battery cells.

16. The battery device according to claim 15, characterized in that: In a projection plane perpendicular to the first direction, along the second direction, two ends of the projection of the rigid segment are flush with two ends of the projection of the corresponding battery cell, or two ends of the projection of the rigid segment exceed two ends of the projection of the corresponding battery cell.

17. The battery device according to claim 14, characterized in that: The battery device further includes a buffer member, which is disposed between adjacent battery cells along the second direction, and in a projection plane perpendicular to the first direction, a projection of the flexible segment at least partially overlaps with a projection of the buffer member.

18. The battery device according to any one of claims 1 to 9, 11 to 13, and 15 to 17, characterized in that: The heat exchange component has an inlet and an outlet communicated with the medium flow channel. The inlet and the outlet are respectively arranged on opposite sides of the heat exchange component along a second direction, and the second direction intersects with the first direction.

19. The battery device according to claim 18, characterized in that: The battery device includes an inlet pipeline and an outlet pipeline, the inlet pipeline is connected in series to the inlet pieces of each of the heat exchange components, the outlet pipeline is connected in series to the outlet pieces of each of the heat exchange components, and the inlet end of the inlet pipeline and the outlet end of the outlet pipeline are located on the same side of the battery cell group along the first direction.

20. The battery device according to any one of claims 1 to 9, 11 to 13, 15 to 17, and 19, characterized in that: The flexible member includes a metal plasticized film.

21. The battery device according to claim 20, characterized in that The flexible member comprises an aluminum-plastic film.

22. 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.

23. The battery device according to claim 22, characterized in that The non-metallic layer is a hot-melt layer.

24. The battery device according to any one of claims 1 to 9, 11 to 13, 15 to 17, 19, 21 to 23, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

25. The battery device according to claim 24, characterized in that The thickness of the flexible member is 0.08 mm-0.2 mm.

26. The battery device according to any one of claims 1 to 9, 11 to 13, 15 to 17, 19, 21 to 23, and 25, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

27. The battery device according to any one of claims 1 to 9, 11 to 13, 15 to 17, 19, 21 to 23, and 25, characterized in that: The rigid member is configured as a metal plate.

28. An electrical equipment, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1-27.

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