Battery device and electrical equipment

Abstract

Embodiments of the present application provide a battery device and an electrical equipment. The battery device includes a box body, a battery cell group, and a heat exchange component. Heat exchange components are arranged on opposite sides of each battery cell along a first direction. Among them, at least one heat exchange component is a first heat exchange component, at least one heat exchange element of the first heat exchange component is arranged as a flexible element, at least one heat exchange component is a second heat exchange component, and the heat exchange elements of the second heat exchange component are all arranged as rigid elements. The flexible element is a layered structure, and the flexible element includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence. In the battery device according to the embodiments of the present application, on the one hand, the expansion force of the battery cell can be absorbed by the first heat exchange component, reducing the transfer of the expansion force to adjacent battery cells. On the other hand, the second heat exchange component can provide a supporting force and a certain limiting effect, reducing the possibility that some heat exchange components are separated from the battery cell due to the deformation of the flexible element.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of batteries, and in particular, to a battery device and an electrical equipment. Background Art

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

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

[0004] A first aspect of embodiments of the present application provides a battery device, the battery device includes: a battery cell group, including a plurality of battery cells stacked along a first direction; a box body, the battery cell group is disposed in the box body; and a heat exchange assembly, heat exchange assemblies are disposed on opposite sides of each battery cell along the first direction, the heat exchange assembly includes at least two heat exchange elements, the at least two heat exchange elements 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 cells, wherein at least one of the heat exchange assemblies is a first heat exchange assembly, at least one of the heat exchange elements of the first heat exchange assembly is provided as a flexible element, at least one of the heat exchange assemblies is a second heat exchange assembly, the heat exchange elements of the second heat exchange assembly are all provided as rigid elements, the flexible element is a layered structure, and the flexible element includes 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 by the embodiments of the present application, heat exchange components are provided on both opposite sides of the battery cell along the first direction. In this way, the heat exchange area between the battery cell and the heat exchange components is increased, which helps to improve the thermal management efficiency and also helps to quickly cool down in case of thermal runaway. On the other hand, at least one heat exchange element of the first heat exchange component is set as a flexible element. The flexible element has a light weight, which is beneficial to reducing the weight of the heat exchange component and thus improving the energy density of the battery device. On the further hand, the flexible element has a certain flexibility, which can make the heat exchange component better fit with the box body and / or the battery cell, improving the thermal management efficiency. Moreover, the flexible element can absorb the expansion force of the battery cell through deformation. Especially in the case of thermal runaway of the battery cell, the flexible element can reduce the transfer of the expansion force to adjacent battery cells and reduce the probability of thermal runaway spreading. On yet another hand, each heat exchange element of the second heat exchange component is set as a rigid element. In the case where the flexible element in the first heat exchange component is compressed and deformed, the second heat exchange component can provide a supporting force and a certain limiting effect for the battery cell, reducing the possibility that some heat exchange components are separated from the battery cell due to the deformation of the flexible element, and thus helping to improve the reliability of thermal management. Especially when a thermal runaway problem occurs, it helps to maintain effective heat dissipation of the battery cell. On yet another hand, the flexible element formed by sequentially laminating a metal layer and a non-metal layer has a thin thickness and a small weight. It is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

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

[0007] In this embodiment, by providing the second heat exchange component 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, and the possibility that both sides of the battery cell along the first direction are separated from the heat exchange component can be avoided as much as possible. Thus, the reliability of thermal management is further improved.

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

[0009] In this embodiment, it can be realized that one side of each battery cell along the first direction is the first heat exchange component and the other side is the second heat exchange component. Furthermore, it helps to balance the absorption of the expansion force and the stability of the 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 elements of the first heat exchange assembly is provided as a flexible element.

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

[0022] In some embodiments, the first heat exchange assembly 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 that the flexible element of the first heat exchange assembly is deformed under pressure, resulting in a reduction or even complete closure of the effective cross-sectional area of the medium flow channel (the area of the cross-section perpendicular to the flow direction of the heat exchange medium), 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 that the support body generates resistance due to a change in position 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. Along the first direction, the connecting portion is disposed on at least one side of the columnar portion, and the connecting portion has a connecting plane facing 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. On the one hand, it can provide support for the flexible element, and on the other hand, it can also cooperate with the flexible element to deform, taking into account the effect of absorbing expansion force.

[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 the second direction. Along the second direction, at least the rigid elements of the second heat exchange assembly include: 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 member is provided to include a rigid section and a flexible section. The flexible section can absorb the stress difference in the second direction through deformation. In this way, the possibility of the rigid member deforming or detaching from the battery cell due to the stress difference can be reduced, and the thermal management reliability can be further improved.

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

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

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

[0035] In this embodiment, the rigid section can completely cover the length range of the battery cell along the second direction. In this way, it helps to further improve the supporting force of the rigid section on the battery cell.

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

[0037] In this embodiment, a buffer member is arranged between adjacent battery cells in the second direction. In this way, it helps to further improve the use reliability of the battery device. Further, the projection of the flexible section at least partially overlaps with the projection of the buffer member. In this way, through the mutual cooperation of the flexible section and the buffer member, the stress absorption effect can be further improved.

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

[0039] In this embodiment, by respectively arranging the inlet member and the outlet member on opposite sides of the heat exchange assembly along the second direction, it helps to reduce the difficulty of pipeline layout 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 parts of the heat exchange components, and the outlet pipeline is connected in series to the outlet parts of the heat exchange components. 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 pipeline connection method helps to make the temperatures of the heat exchange media entering each heat exchange component substantially the same. Thus, it helps to provide good heat dissipation for each battery cell in the first direction and improve the uniformity of the battery cell temperatures. Further, this pipeline connection method can achieve that the inlet end and the outlet end are located on the same side of the battery cell, that is, on the same side of the box body. Thus, it is convenient to connect to an external heat exchange media source during actual use.

[0042] In some embodiments, the flexible member includes a metalized film.

[0043] In this embodiment, since the metalized film has a thin thickness and a small weight, and a medium flow channel is formed between the metalized film and the heat exchange member, it is not affected by the extrusion process and does not need to meet large thickness requirements. Therefore, the overall thickness and weight of the heat exchange component can be reduced.

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

[0045] The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance 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 as 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 as 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-metal layer is a hot melt layer.

[0049] In this embodiment, by setting the non-metal layer as a hot melt layer, that is, composed of a hot melt material, it is beneficial to compound the non-metal layer with the metal layer through hot melting, with simple molding and 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 member to be 0.05 mm - 0.3 mm, while the heat exchange assembly made of the flexible member has a certain structural strength, the overall thickness of the heat exchange assembly is relatively small, which is beneficial to reducing the overall volume and weight of the battery device, so as to increase the energy density of the battery device.

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

[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 member to be 0.1 MPa - 10000 MPa, on one hand, the flexible member has a certain structural strength, improving the reliability of the heat exchange assembly, and on the other hand, it has a certain deformation ability, which can improve the fitting degree between the heat exchange assembly and the box body and / or the battery cell, thereby increasing the effective heat exchange area between the heat exchange assembly and the box body and / or the battery cell, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly.

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

[0057] In this embodiment, by setting the rigid member as a metal plate, the metal plate not only has good structural strength but also has good heat conduction performance.

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

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

[0060] Figure 1 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0061] Figure 2 It is a three-dimensional exploded schematic diagram of a battery device provided by an embodiment of the present application;

[0062] Figure 3 It is a schematic structural diagram of a heat exchange assembly provided by an embodiment of the present application;

[0063] Figure 4 A schematic structural view of another perspective of the heat exchange component provided by an embodiment of the present application;

[0064] Figure 5 is Figure 3 a schematic view of the A-A cross-section of;

[0065] Figure 6 A schematic structural view of the rigid member provided by an embodiment of the present application.

[0066] Description of reference numerals

[0067] 1000, vehicle; 100, battery device; 10, battery cell group; 11, battery cell; 20, box body; 21, side beam; 30, heat exchange component; 30a, first heat exchange component; 30b, second heat exchange component; 31, flexible member; 32, rigid member; 321, rigid section; 322, flexible section; 33, medium flow channel; 34, support body; 341, columnar portion; 342, connecting portion; 35, inlet member; 36, outlet member; 40, fixing member; 40a, abutting plane; 50, buffer member; 60, inlet pipeline; 61, inlet end; 70, outlet pipeline; 71, outlet end; 200, controller; 300, motor. Detailed implementation manners

[0068] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to 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.

[0069] In the various specific technical features described in the specific embodiments, they can be combined in any appropriate manner without conflict. For example, different embodiments and technical solutions can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination methods of the specific technical features in the present application will not be described separately.

[0070] In the following description, the terms "first / second / ..." involved are only used to distinguish different objects and do not indicate that there are the same or related relationships between the objects. It should be understood that the orientation descriptions "above", "below", "outside", "inside" involved are all orientations in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagram, which may or may not be the left and right directions in the normal use state.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0077] Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0078] With the development of clean energy, more and more devices use electric energy as the driving energy. As a result, power batteries that can store a large amount of electric energy and can be repeatedly charged and discharged have developed rapidly, such as lithium-ion batteries. Among them, power batteries are not only applied to energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in many fields such as aerospace.

[0079] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0080] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0081] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed 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 extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0082] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0083] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0084] In some embodiments, the electrode assembly is a stacked structure.

[0085] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0086] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0087] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0088] As an example, a plurality of separators may be provided and are respectively disposed between any adjacent positive electrode plates or negative electrode plates.

[0089] As an example, the separators may be continuously provided and are disposed between any adjacent positive electrode plates or negative electrode plates by folding or winding.

[0090] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, or the like.

[0091] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0092] In some embodiments, the battery cell may include a housing. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0093] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and there is no particular limitation in this application.

[0094] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0095] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal may be provided on the end cap or on the housing body.

[0096] During the use of a battery device, the battery cells within the battery device generate heat. If this heat is too high, it will have an adverse impact 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 related technologies, a cooling system is provided in the battery device box to cool the battery cells in the battery device. The above cooling system may include a plurality of aluminum water-cooled plates laid in the battery device box, and the surfaces of the plurality of water-cooled plates are in contact with the surfaces of the battery cells in the battery device. During use, for example, a heat exchange medium such as water flows through the above-mentioned plurality of water-cooled plates, thereby taking away the heat on the battery cells and cooling the battery cells. However, in the case where the aluminum water-cooled plates in the above cooling system are arranged between adjacent cells, if one of the battery cells undergoes thermal runaway, the expansion force may be transmitted to another adjacent battery cell through the aluminum water-cooled plate, resulting in the spread of thermal runaway.

[0097] In view of this, in order to improve the thermal management efficiency and reduce the probability of thermal runaway spread, an embodiment of the present application provides a battery device, which includes a box body, 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 body, 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 members, and the at least two heat exchange members are stacked along the first direction to form at least one medium flow channel for conducting a heat exchange medium, and the heat exchange medium is used for heat exchange with the battery cells. Among them, at least one heat exchange component is a first heat exchange component, at least one heat exchange member of the first heat exchange component is set as a flexible member, at least one heat exchange component is a second heat exchange component, and the heat exchange members of the second heat exchange component are all set as rigid members. The flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0098] In the battery device provided by the embodiment of the present application, heat exchange components are arranged on both opposite sides of the battery cell along the first direction. In this way, the heat exchange area between the battery cell and the heat exchange components is increased, which helps to improve the thermal management efficiency and also helps to quickly cool down in the event of thermal runaway. On the other hand, at least one heat exchange element of the first heat exchange component is arranged as a flexible element. The flexible element has a light weight, which is beneficial to reducing the weight of the heat exchange component and thus improving the energy density of the battery device. On the other hand, the flexible element has a certain flexibility, which can make the heat exchange component better fit with the box body and / or the battery cell, improving the thermal management efficiency. Moreover, the flexible element can absorb the expansion force of the battery cell through deformation. Especially in the case of thermal runaway of the battery cell, the flexible element can reduce the transmission of the expansion force to adjacent battery cells and reduce the probability of thermal runaway spreading. On the other hand, each heat exchange element of the second heat exchange component is arranged as a rigid element. In the case where the flexible element in the first heat exchange component is compressed and deformed, the second heat exchange component can provide a supporting force and a certain limiting effect for the battery cell, reducing the possibility that part of the heat exchange component is separated from the battery cell due to the deformation of the flexible element, and thus helping to improve the reliability of thermal management. Especially when a thermal runaway problem occurs, it helps to maintain effective heat dissipation of the battery cell. On the other hand, the flexible element composed of a metal layer and a non-metal layer stacked in sequence has a thin thickness and a small weight. It is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component can be reduced. In addition, the heat exchange component will not react with the heat exchange medium flowing inside, so there is no possibility of corrosion and leakage.

[0099] The technical solutions described in the embodiments of the present application are applicable to electrical equipment using the battery device. The electrical equipment includes the battery device of any embodiment of the present application, and the battery device is used to provide electrical energy.

[0100] The electrical equipment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical equipment.

[0101] It should be noted that the technical solutions described in the embodiments of the present application are not only limited to the battery device described above, but also applicable to all electrical equipment and energy storage equipment including battery devices. However, for the sake of simplicity of description, the following embodiments are described by taking an electric vehicle as an example.

[0102] Referring to Figure 1 , inside the vehicle 1000, a controller 200, a motor 300, and a battery device 100 can be provided. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be provided at the bottom, the front end, or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and applied to the circuit system of the vehicle 1000, such as the working power requirements for starting, navigating, and running of the vehicle 1000. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Referring to Figure 2 , in order to meet different power usage requirements, the battery device 100 includes a plurality of battery cells 11. A battery cell 11 refers to the smallest unit that makes up a battery module or a battery pack. The plurality of battery cells 11 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 11. The plurality of battery cells 11 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 11 is accommodated in the box body 20. Of course, the battery device 100 can also be in the form that a plurality of battery cells 11 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box body 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection among 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 in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0104] Referring to Figures 2 - 6, embodiments of the present application provide a battery device 100, which includes a box body 20, a battery cell group 10, and a heat exchange component 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 within the box body 20. Heat exchange components 30 are disposed on opposite sides of each battery cell 11 along the first direction. The heat exchange component 30 includes at least two heat exchange elements, and the at least two heat exchange elements are stacked along 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 cells 11. Among them, at least one heat exchange component 30 is a first heat exchange component 30a, and at least one heat exchange element of the first heat exchange component 30a is provided as a flexible element 31. At least one heat exchange component 30 is a second heat exchange component 30b, and the heat exchange elements of the second heat exchange component 30b are all provided as rigid elements 32.

[0105] As used in the embodiments of the present application, the term "plurality" refers to a quantity of two or more.

[0106] 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 within the box body 20.

[0107] The box body 20 may be a simple three-dimensional structure such as a separate cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The material of the box body 20 may be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0108] The box body 20 is used to encapsulate the battery cells 11, and the box body 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 11.

[0109] As an example, the box body 20 is generally a cuboid structure. The length direction and width direction of the box body 20 are both parallel to the horizontal plane, and the length direction of the box body 20 is parallel to the longest side of the cuboid structure of the box body 20. The height direction of the box body 20 is perpendicular to the ground.

[0110] 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, and 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 cuboid structure as an example, the first direction may be the length direction of the box body 20 or the width direction of the box body 20.

[0111] The battery device 100 may include one or more battery cell groups 10. In the case where 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 housing 20. As an example, the first direction is the length direction of the housing 20, and the second direction is the width direction of the housing 20.

[0112] Heat exchange components 30 are provided on both opposite sides of each battery cell 11 along the first direction. That is, along the first direction, heat exchange components 30 are provided between adjacent battery cells 11, and heat exchange components 30 are also provided between the end battery cells 11 and the housing 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.

[0113] As mentioned above, the battery device 100 may include multiple battery cell groups 10 distributed along the second direction. In this case, in a projection plane perpendicular to the first direction, one heat exchange component 30 may cover only one battery cell 11, or may cover multiple battery cells 11 distributed along the second direction at the same time.

[0114] It should be noted that the battery device 100 may further include other heat exchange structures having a heat exchange function, such as heat exchange structures provided on the top side and / or bottom side of the battery cells 11, heat exchange structures provided on one side or both sides of the battery cells 11 along the second direction, and the like.

[0115] The heat exchange component 30 includes at least two heat exchange elements. The at least two heat exchange elements 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 cells 11.

[0116] The at least two heat exchange elements are stacked to form at least one medium flow channel 33, which means that a medium flow channel 33 is formed between adjacent heat exchange elements. In other words, among adjacent two heat exchange elements, one heat exchange element forms at least part of the side wall of the medium flow channel 33, and the other heat exchange element also forms 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 cells 11.

[0117] As an example, among adjacent two heat exchange elements, a flow channel groove is formed on the surface of one heat exchange element facing the other heat exchange element, and the surface of the other heat exchange element facing this heat exchange element is a plane. The plane and the flow channel groove enclose to form the medium flow channel 33. Or, flow channel grooves are formed on the surfaces of adjacent two heat exchange elements facing each other, and the two flow channel grooves enclose to form the medium flow channel 33.

[0118] The medium flow channel 33 is used to conduct the heat exchange medium. It should be noted that the specific type of the heat exchange medium is not limited here, as long as it can achieve the 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 taken as the coolant for description.

[0119] The specific number of the medium flow channels 33 is not limited here. It can be one or multiple.

[0120] The heat exchange assembly 30 can include three or more heat exchange elements. In this case, a medium flow channel 33 can be formed between every two adjacent heat exchange elements.

[0121] The principle of the heat exchange assembly 30 for heat-exchanging the battery cell 11 is as follows: The heat exchange medium output from a heat exchange medium source (not shown in the figure) enters the medium flow channel 33 through the inlet of the heat exchange assembly 30. 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 assembly 30, completing the heat exchange of the battery cell 11.

[0122] Here, the heat exchange of the heat exchange assembly 30 to the battery cell 11 can be to dissipate heat from the battery cell 11, or to heat the battery cell 11.

[0123] The principle of the heat exchange assembly 30 for dissipating heat from the battery cell 11 is as follows: The heat exchange medium output from the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange assembly 30. After the heat exchange medium absorbs the heat generated during the operation of the battery cell 11, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, releasing the heat and completing the cooling and heat dissipation of the battery cell 11.

[0124] The principle of the heat exchange assembly 30 for heating the battery cell 11 is as follows: The heat exchange medium output from the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange assembly 30. The heat exchange medium transfers the heat to the battery cell 11, realizing the heating of the battery cell 11. After that, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, completing the heating of the battery cell 11.

[0125] 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 element of the first heat exchange assembly 30a is set as the flexible element 31, and the heat exchange elements of the second heat exchange assembly 30b are all set as the rigid elements 32.

[0126] Here, the flexibility in the flexible member 31 refers to the material property of the structure. Such a type of property can be a property bestowed upon the material due to its relatively light mass, or it can be a property bestowed upon the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, etc. of the material. As an example, the material of the flexible member 31 can be selected as a material with a relatively light mass compared to conventional structural materials such as aluminum plates and steel plates, and its flexibility can be controlled by the thickness, width, length, and type of the material of the flexible member 31.

[0127] 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 sequentially stacked.

[0128] 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.

[0129] As an example, between the metal layer and the non-metal layer, it can be formed by hot pressing or hot melting.

[0130] The number of the metal layer and the non-metal layer is not limited.

[0131] In the embodiment of the present application, by setting the first heat exchange assembly 30a to include the flexible member 31, it is beneficial to reduce the weight of the heat exchange assembly 30, and thus improve the energy density of the battery device 100.

[0132] Furthermore, the flexible member 31 has certain expandable or contractible properties. It can also be understood that the flexible member 31 can be an elastically deformable structure, and the flexible member 31 has the ability to deform and recover from deformation. Thereby, the heat exchange assembly 30 can adapt to the external contour shape of the battery cell 11 or other components through a certain amount of elastic deformation, so as to improve the fitting degree between the heat exchange assembly 30 and the box body 20 and / or the battery cell 11, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body 20 and / or the battery cell 11, and further improving the heat exchange efficiency.

[0133] Furthermore, the above properties also enable the flexible member 31 to absorb the expansion force of the battery cell 11 through deformation, improving the use reliability of the battery device 100. Especially in the case where the battery cell 11 undergoes thermal runaway (at this time, the expansion force will increase significantly), the flexible member 31 can, to a certain extent, prevent the expansion force of the thermally runaway battery from being transmitted to the adjacent battery cell 11, reducing the possibility of the adjacent battery cell 11 being damaged by compression.

[0134] Here, the rigidity in the rigid member 32 refers to the material property of the structure. This type of property can be the property endowed to the material due to the relatively heavy mass of the material, or can be the property endowed to the material due to at least any one of the properties such as the thickness, stiffness, strength, elastic modulus, etc. of the material. As an example, the material of the rigid member 32 can be selected as metal plates such as conventional aluminum plates and steel plates, or materials of structures such as composite material plates, and its rigidity can be controlled by the thickness, width, length, and type of the material of the rigid member 32.

[0135] It should be noted that each heat exchange member of the first heat exchange assembly 30a can be set as the flexible member 31, or at least one heat exchange member of the first heat exchange assembly 30a is set as the flexible member 31, and at least one heat exchange member is set as the rigid member 32. In the embodiment where at least one heat exchange member of the first heat exchange assembly 30a is set as the flexible member 31 and at least one heat exchange member is set as the rigid member 32, a medium flow channel 33 is formed between the flexible member 31 and the rigid member 32.

[0136] Furthermore, in this application, it is proposed that if all the heat exchange assemblies 30 are set as the first heat exchange assemblies 30a, the possible situation is that after the flexible members 31 of some of the first heat exchange assemblies 30a are deformed under pressure, there will be a large difference in the pressures received by each first heat exchange assembly 30a, resulting in the possibility that the flexible members 31 of some first heat exchange assemblies 30a may be separated from the battery cells 11 and thus unable to complete effective heat exchange.

[0137] Therefore, in this embodiment, at least one heat exchange assembly 30 is set as the second heat exchange assembly 30b, and each heat exchange member of the second heat exchange assembly 30b is set as the rigid member 32. In this way, the second heat exchange assembly 30b can play a role in supplementary support and positioning, reducing the possibility that the flexible members 31 of the first heat exchange assembly 30a are deformed and causing the heat exchange assembly 30 to be separated from the battery cells 11, thereby improving the reliability of thermal management.

[0138] In this embodiment, there are no restrictions on the specific installation positions of the first heat exchange assembly 30a and the second heat exchange assembly 30b. Those skilled in the art can specifically select to use the first heat exchange assembly 30a or the second heat exchange assembly 30b according to the stress distribution at each position during actual use.

[0139] In the battery device 100 provided by the embodiment of this application, heat exchange assemblies 30 are provided on both 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 assemblies 30 is increased, which helps to improve the thermal management efficiency and helps to quickly cool down in case of thermal runaway.

[0140] 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 .

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] In some embodiments, reference Figure 2, along the first direction, the first heat exchange component 30a and the second heat exchange component 30b are alternately arranged.

[0148] In this embodiment, it can be realized that 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. Furthermore, it helps to balance the absorption of expansion force and the stability of support, thereby further improving the reliability of thermal management.

[0149] In some embodiments, referring to Figure 2 , the box body 20 includes two side beams 21 arranged opposite to each other along the first direction. The side beams 21 are used to constrain the battery cell group 10, and the heat exchange component 30 between the battery cell 11 at the end of the battery cell group 10 along the first direction and the side beam 21 is the first heat exchange component 30a.

[0150] Here, the side beam 21 is usually also called the 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.

[0151] 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 the first heat exchange components 30a.

[0152] In this embodiment, the heat exchange component 30 arranged between the battery cell group 10 and the side beam 21 is the first heat exchange component 30a. In this way, the first heat exchange component 30a can 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 anti-deformation ability of the side beam 21 and further improving the use reliability of the battery device 100.

[0153] In some embodiments, referring to Figure 2 , the battery device 100 includes a fixing member 40, and the fixing member 40 connects the first heat exchange component 30a and the side beam 21.

[0154] Here, the specific structural form of the fixing member 40 is not limited, as long as it can realize the relative fixation between the first heat exchange component 30a and the side beam 21.

[0155] In this embodiment, by providing the 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 that the first heat exchange component 30a is separated from the battery cell 11 due to displacement can be reduced. Thus, it helps to further improve the reliability of thermal management.

[0156] In some embodiments, referring to Figure 2 , along the first direction, one side of the fixing member 40 facing the first heat exchange component 30a forms a abutting plane 40a, and the other side is fixedly connected to the side beam 21.

[0157] As an example, in the projection plane perpendicular to the first direction, the projection of the abutting plane 40a covers the projection of the first heat exchange component 30a.

[0158] The abutting plane 40a and the first heat exchange component 30a may only abut against each other without a fixed connection. Alternatively, the abutting plane 40a may be connected to the first heat exchange component 30a by means such as adhesion or welding.

[0159] There is no limitation on the specific implementation manner of the fixed member 40 being fixedly connected to the side beam 21. For example, it may be adhesion, welding, snap connection, connection by fasteners, etc. The fixed member 40 and the side beam 21 may be directly connected, or there may only be other intermediate structures connecting them.

[0160] In this embodiment, by forming the abutting plane 40a on the side of the fixed 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, improving the anti-deformation ability of the first heat exchange component 30a and further enhancing the use reliability of the battery device 100.

[0161] In some embodiments, referring to Figure 5 , at least one heat exchange member of the first heat exchange component 30a is provided as a rigid member 32.

[0162] As mentioned above, in such an embodiment, a medium flow channel 33 is formed between the rigid member 32 and the flexible member 31 of the first heat exchange component 30a.

[0163] In this embodiment, at least one heat exchange member being provided as a flexible member 31 means that the number of flexible members 31 is one or more. In embodiments where multiple heat exchange members are provided as flexible members 31, the flexible members 31 may be the same or different.

[0164] At least one heat exchange member being provided as a rigid member 32 means that the number of rigid members 32 is one or more. In embodiments where multiple heat exchange members are provided as rigid members 32, the rigid members 32 may be the same or different.

[0165] As an example, the first heat exchange component 30a includes two heat exchange members, one of which is a flexible member 31 and the other is a rigid member 32. As an example, the first heat exchange component 30a includes three or more heat exchange members, at least two of which are flexible members 31, or at least two of which are rigid members 32, and the flexible members 31 and the rigid members 32 are alternately arranged.

[0166] In this embodiment, by setting the first heat exchange component 30a to include the flexible member 31 and the rigid member 32, while enabling the first heat exchange component 30a to have a flexible function, it can also make the first heat exchange component 30a have a certain structural strength.

[0167] In the embodiment where the heat exchange component 30 between the battery cell 11 and the side beam 21 disposed at the end of the battery cell group 10 along the first direction is the first heat exchange component 30a, the first heat exchange component 30a may include at least one rigid member 32. In this case, the rigid member 32 of the first heat exchange component 30a is disposed on the side facing the battery cell 11.

[0168] In this way, the supporting ability of the first heat exchange component 30a for the battery cell 11 can be improved, and the force uniformity of the battery cell 11 can be improved.

[0169] It should be noted that for each of the first heat exchange components 30a disposed between adjacent battery cells 11, the specific orientations of the rigid member 32 and the flexible member 31 are not limited, and the orientations of the rigid members 32 of these first heat exchange components 30a may be the same or different.

[0170] In some embodiments, each heat exchange member of the first heat exchange component 30a may also be set as the flexible member 31. In this way, the ability of the first heat exchange component 30a to absorb the expansion force can be further improved.

[0171] In some embodiments, at least one heat exchange member of a part of the first heat exchange components 30a may be the flexible member 31 and at least one heat exchange member may be the rigid member 32. Such a first heat exchange component 30a may be specifically disposed between the battery cell 11 and the side beam 21. Each heat exchange member of another part of the first heat exchange components 30a is the flexible member 31, and such a first heat exchange component 30a may be specifically disposed between adjacent battery cells 11 along the first direction.

[0172] In some embodiments, with reference to Figure 5 , the first heat exchange component 30a includes a support body 34, and the support body 34 is disposed in the medium flow channel 33.

[0173] Here, the specific structural form of the support body 34 is not limited. The support body 34 may 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 member 31 and less than the elastic modulus of the rigid member 32.

[0174] 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 an overall strip-shaped structure, and its central axis 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 may abut against the heat exchange member, or the opposite ends of the support body 34 along the first direction respectively abut against two heat exchange members, so as to improve its support effect.

[0175] In this embodiment, by providing a support body 34 in the medium flow channel 33, the possibility that the flexible member 31 of the first heat exchange assembly 30a is deformed under pressure, resulting in a reduction or even complete closure of the effective cross-sectional area of the medium flow channel 33 (the area of the cross-section perpendicular to the flow direction of the heat exchange medium), can be reduced, thereby improving the reliability of thermal management.

[0176] 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 the first heat exchange assembly 30a in which at least one heat exchange member is a rigid member 32, and also including the first heat exchange assembly 30a in which all heat exchange members are flexible members 31.

[0177] In some embodiments, along the first direction, at least one end of the support body 34 is fixed to the heat exchange member.

[0178] Here, the specific implementation manner of fixing the support body 34 to the heat exchange member is not limited. For example, it can be bonding, clamping, welding, etc. Or, the support body 34 and the heat exchange member are formed as an integral structure.

[0179] The support body 34 can be fixed to the heat exchange member at only one end along the first direction, or both opposite ends can be fixed to the heat exchange member. In comparison, fixing one end of the support body 34 to the heat exchange member and not fixing the other end to the heat exchange member along the first direction helps to reduce the assembly difficulty.

[0180] In this embodiment, by fixing at least one end of the support body 34 to the heat exchange member, the position stability of the support body 34 in the medium flow channel 33 can be improved, and the possibility that the support body 34 generates resistance due to a change in position during the flow of the heat exchange medium can be reduced.

[0181] In some embodiments, referring to 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 facing the heat exchange member.

[0182] 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.

[0183] Here, the connecting portion 342 can be provided on one side of the columnar portion 341 along the first direction, or on both opposite sides of the columnar portion 341 along the first direction. The connecting plane of the connecting portion 342 can be abutted against the heat exchange member, or can be further relatively fixed to the heat exchange member. The fixing method is not limited, such as bonding, welding, etc.

[0184] 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.

[0185] 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.

[0186] In some embodiments, the support body 34 is an elastic structure.

[0187] 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.

[0188] 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 .

[0189] 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.

[0190] 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.

[0191] 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.

[0192] As an example, the material of the flexible section 322 is the same as the material of the flexible member 31 .

[0193] In this embodiment, the rigid member 32 of at least the second heat exchange component 30b including the rigid section 321 and the flexible section 322 means that each rigid member 32 of the second heat exchange component 30b includes the rigid section 321 and the flexible section 322.

[0194] In the embodiment where at least one heat exchange member of the first heat exchange component 30a is set as the rigid member 32, the rigid member 32 of the first heat exchange component 30a may include the flexible section 322 or may not include the flexible section 322.

[0195] In this embodiment, the specific connection manner between the flexible section 322 and the rigid section 321 is not limited, such as welding, bonding, etc. As an example, the flexible section 322 may be connected to one end face of the rigid section 321 along the second direction. As another example, a part of the flexible section 322 may be stacked with the rigid section 321 along the first direction to increase the contact area between the two, thereby improving the connection stability.

[0196] It can be understood that in the case where multiple battery cell groups 10 are distributed along the second direction, there are certain differences in the stress distribution of the heat exchange component 30 along the second direction. Such stress differences 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 member 31, it can absorb such stress differences, but for the rigid member 32, the stress differences may cause local deformation of it and / or cause it to displace and thus be separated from some battery cells 11.

[0197] Therefore, in this embodiment, the rigid member 32 is set to include the rigid section 321 and the flexible section 322, and the flexible section 322 can absorb the stress differences in the second direction through deformation. In this way, the possibility of the rigid section 321 of the rigid member 32 deforming or being separated from the battery cell 11 due to stress differences can be reduced, and the thermal management reliability can be further improved.

[0198] In some embodiments, the rigid sections 321 are arranged in one-to-one correspondence with the battery cells 11. Here, the rigid member 32 being arranged in one-to-one correspondence with the battery cells 11 specifically means that the number of the rigid sections 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 the battery cell groups 10), and in the projection plane perpendicular to the first direction, the projection of the rigid section 321 at least partially overlaps with the projection of the corresponding battery cell 11.

[0199] In this embodiment, by arranging the rigid sections 321 in one-to-one correspondence with the battery cell groups 10, on the one hand, it helps to provide better support for the battery cells 11, and on the other hand, it helps the flexible section 322 to fully absorb the stress differences caused by each battery cell 11.

[0200] In some embodiments, in the projection plane perpendicular to the second 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 extend beyond the two ends of the projection of the corresponding battery cell 11.

[0201] In this embodiment, the rigid segment 321 can completely cover the length range of the battery cell 11 along the second direction. Thus, it helps to further improve the supporting force of the rigid segment 321 on the battery cell 11.

[0202] In some embodiments, referring to Figure 2 , the battery device 100 further includes a buffer member 50. Along the second direction, the buffer member 50 is disposed between adjacent battery cells 11. In the projection plane perpendicular to the first direction, the projection of the flexible segment 322 and the projection of the buffer member 50 at least partially overlap.

[0203] Here, the buffer member 50 is mainly used to absorb the stress between adjacent battery cells 11 along the second direction. As an example, the buffer member 50 is an elastic pad structure.

[0204] In this embodiment, the buffer member 50 is disposed between adjacent battery cells 11 in the second direction. Thus, it helps to further improve the use reliability of the battery device 100. Further, the projection of the flexible segment 322 and the projection of the buffer member 50 at least partially overlap. Thus, through the mutual cooperation of the flexible segment 322 and the buffer member 50, the stress absorption effect can be further improved.

[0205] In some embodiments, referring to Figure 2 , the heat exchange assembly 30 has an inlet member 35 and an outlet member 36 communicating with the medium flow channel 33. The inlet member 35 and the outlet member 36 are respectively disposed on opposite sides of the heat exchange assembly 30 in the second direction, and the second direction intersects the first direction.

[0206] Here, the inlet member 35 and the outlet member 36 are respectively used for the heat exchange medium to flow into and out of the medium flow channel 33. As an example, the inlet member 35 and the outlet member 36 include water nozzles.

[0207] In this embodiment, by respectively disposing 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 pipeline layout in the box body 20.

[0208] 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.

[0209] In some embodiments, still referring to Figure 2, the battery device 100 includes an inlet pipeline 60 and an outlet pipeline 70. The inlet pipeline 60 is connected in series with the inlet parts 35 of each heat exchange component 30, and the outlet pipeline 70 is connected in series with 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 in the first direction.

[0210] Here, the inlet pipeline 60 being connected in series with the inlet parts 35 of each heat exchange component 30 specifically means that the inlet pipeline 60 connects the inlet part 35 of a heat exchange component 30 with the inlet part 35 of another adjacent heat exchange component 30. The outlet pipeline 70 being connected in series with the outlet parts 36 of each heat exchange component 30 specifically means that the inlet pipeline 60 connects the outlet part 36 of a heat exchange component 30 with the outlet part 36 of another adjacent heat exchange component 30.

[0211] The inlet end 61 of the inlet pipeline 60 specifically refers to the end where the heat exchange medium flows into the inlet pipeline 60, and the outlet end 71 of the outlet pipeline 70 specifically refers to the end where the heat exchange medium flows out of the outlet pipeline 70.

[0212] The inlet end 61 and the outlet end 71 are specifically arranged between the first heat exchange component 30a and the side beam 21. In the embodiment where the battery device 100 includes the fixing member 40, the inlet end 61 and the outlet end 71 are specifically arranged between the fixing member 40 and the side beam 21.

[0213] In this embodiment, such a pipeline connection method helps to make the temperatures of the heat exchange media entering each heat exchange component 30 approximately the same. In this way, it helps to provide better heat dissipation for each battery cell 11 in the first direction and improve the uniformity of the temperatures of the battery cells 11. Further, such a pipeline connection method can make the inlet end 61 and the outlet end 71 located on the same side of the battery cells 11, that is, on the same side of the box body 20. In this way, it is convenient to connect with an external heat exchange medium source during actual use.

[0214] In some embodiments, the flexible member 31 includes a metalized plastic film.

[0215] The flexible member 31 is a single-layer or multi-layer film.

[0216] Here, the metalized plastic film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer (that is, a non-metal layer).

[0217] In this embodiment, since the metalized plastic film has a thin thickness and a small weight, and by forming the medium flow channel 33 between the metalized plastic film and the heat exchange member, it is not affected by the extrusion process and does not need to meet large thickness requirements, so the overall thickness and weight of the heat exchange component 30 can be reduced.

[0218] In some embodiments, the flexible member 31 includes an aluminum-plastic film.

[0219] The aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte resistance stability, and electrical insulation properties.

[0220] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0221] By setting the metal layer as 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.

[0222] In some embodiments, the non-metal layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0223] By setting the non-metal layer as one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0224] As an example, a non-metal layer made of a corrosion-resistant material with acid and alkali corrosion resistance can also be selected, or in other words, additives are added to the non-metal layer to make the non-metal layer have acid and alkali corrosion resistance.

[0225] In some embodiments, the non-metal layer is a heat-melt layer.

[0226] In this embodiment, by setting the non-metal layer as a heat-melt layer, that is, composed of a heat-meltable material, it is beneficial to make the non-metal layer and the metal layer composite together through heat melting, with simple molding and high production efficiency.

[0227] In some embodiments, the thickness of the flexible member 31 is 0.05 mm - 0.3 mm.

[0228] As an example, the thickness of the flexible member 31 is any point value among 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 point value between any two of them.

[0229] In this embodiment, by setting the thickness of the flexible member 31 to 0.05 mm - 0.3 mm, while the heat exchange component 30 made of the flexible member 31 has a certain structural strength, the overall thickness of the heat exchange component 30 is relatively small, which is beneficial to reducing the overall volume and weight of the battery device 100, so as to increase the energy density of the battery device 100.

[0230] In some embodiments, the thickness of the flexible member 31 is 0.08 mm - 0.2 mm.

[0231] As an example, the thickness of the flexible member 31 is a point value of any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm or a point value between any two of them.

[0232] In this embodiment, by setting the thickness of the flexible member 31 to 0.08 mm - 0.2 mm, while the heat exchange assembly 30 made of the flexible member 31 has a certain structural strength, further, the overall thickness of the heat exchange assembly 30 is relatively small, which is beneficial to further reducing the overall volume and weight of the battery device 100, so as to further increase the energy density of the battery device 100.

[0233] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa - 10000 MPa.

[0234] As an example, the elastic modulus of the flexible member 31 can be a point value of any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, 10000 MPa or a point value between any two of them.

[0235] The elastic modulus describes the magnitude of the unit strain caused by the unit stress when a solid is stressed within a certain range, and it is one of the basic physical quantities of materials. The larger the elastic modulus, the greater the stiffness of the material and the stronger the compressive capacity. The elastic modulus is a physical quantity that describes the elasticity of a substance.

[0236] The measurement methods of the elastic modulus of the flexible member 31 can include at least one of the static tensile test method, dynamic test method, sound velocity method, nanoindentation method, and bending method. The measuring instruments can include nanoindenters and universal testing machines.

[0237] Exemplarily, at normal temperature and pressure, the elastic modulus of the flexible member 31 can be measured by the nanoindentation method. The nanoindentation method uses a micro 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.

[0238] In this embodiment, by setting the elastic modulus of the flexible member 31 to be 0.1 MPa - 10,000 MPa, the flexible member 31 has a certain structural strength, improving the reliability of the heat exchange assembly 30, and also has a certain deformation ability, which can enhance the fitting degree between the heat exchange assembly 30 and the box body 20 and / or the battery cell 11, thereby increasing the effective heat exchange area between the heat exchange assembly 30 and the box body 20 and / or the battery cell 11, and thus improving the heat exchange efficiency and heat exchange effect of the heat exchange assembly 30.

[0239] In some embodiments, the elongation at break of the flexible member 31 is greater than that of the rigid member 32. The elongation at break is a percentage index of the elongation amount to the original length when the material is stretched and fractured. It is used to measure the deformation ability that the material can withstand during the stretching process, that is, the elongation at break represents the ductility of the material when it is stretched under force.

[0240] The elongation at break of the flexible member 31 is greater than that of the rigid member 32. In other words, when stretched under force, the ductility of the flexible member 31 is greater than that of the rigid member 32.

[0241] In some embodiments, the elongation at break of the flexible member 31 is in the range of 30% to 300%.

[0242] The elongation at break of the flexible member 31 can be any point value among 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300% or any point value between any two of them.

[0243] 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 a certain impact resistance and puncture resistance while also having a certain structural strength.

[0244] In some embodiments, the elongation at break of the rigid member 32 is in the range of 1% to 50%.

[0245] The elongation at break of the rigid member 32 can be any point value among 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 point value between any two of them.

[0246] In this embodiment, by setting the elongation at break of the rigid member 32 to be in the range of 1% to 50%, the rigid member 32 can have sufficient structural strength, which is beneficial to improving the overall structural strength of the heat exchange assembly 30.

[0247] In some embodiments, the rigid member 32 is provided as a metal plate.

[0248] As an example, the rigid member 32 may be an aluminum alloy plate, and its outer surface may be subjected to insulation treatment.

[0249] In this embodiment, by setting the rigid member 32 as a metal plate, the metal plate has both good structural strength and good heat conduction performance.

[0250] The following further illustrates the battery device 100 provided by the embodiments of the present application with a specific embodiment.

[0251] Referring to Figures 2 - 6 , the battery device 100 includes a box body 20, a battery cell group 10, and a heat exchange component 30. The battery cell group 10 is disposed within the box body 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. A plurality of battery cell groups 10 are distributed along a second direction to form a battery cell array. Here, the second direction intersects the first direction, and both the first direction and the second direction are perpendicular to the height direction of the box body 20.

[0252] Heat exchange components 30 are disposed on opposite sides of each battery cell 11 along the first direction. The heat exchange component 30 includes 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 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.

[0253] At least one heat exchange component 30 is a first heat exchange component 30a. At least one heat exchange member of the first heat exchange component 30a is provided as a rigid member 32, and at least one heat exchange member is provided as a flexible member 31. At least one heat exchange component 30 is a second heat exchange component 30b, and each heat exchange member of the second heat exchange component 30b is provided as a rigid member 32.

[0254] Along the first direction, the first heat exchange component 30a and the second heat exchange component 30b are alternately arranged. Among them, the box body 20 includes two side beams 21 oppositely arranged along the first direction. The side beams 21 are used to restrain the battery cell group 10. The heat exchange component 30 between the battery cell 11 disposed at the end of the battery cell group 10 along the first direction and the side beam 21 is the first heat exchange component 30a. In this first heat exchange component 30a, the rigid member 32 is disposed on the side facing the battery cell 11. The battery device 100 includes a fixing member 40, and the fixing member 40 connects the first heat exchange component 30a and the side beam 21.

[0255] The first heat exchange component 30a includes a support body 34 disposed in the medium flow channel 33. The support body 34 is an elastic structure and 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 disposed on at least one side of the columnar portion 341, and the connecting portion 342 has a connecting plane facing the heat exchange member.

[0256] The rigid members 32 of the first heat exchange component 30a and the second heat exchange component 30b each include at least two rigid segments 321 and at least one flexible segment 322. The flexible segment 322 connects two adjacent rigid segments 321. The rigid segments 321 are arranged in one-to-one correspondence with the battery cells 11. Along the second direction, a buffer member 50 is disposed between two adjacent battery cells 11.

[0257] 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 extend beyond 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.

[0258] An embodiment of the present application further provides an electrical device, which includes the battery device 100 described in any of the above embodiments.

[0259] The electrical device 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 elaborated here.

[0260] In the description of the present application, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of different embodiments or examples.

[0261] 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 can have various modifications and changes. 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 a flexible component, at least one of the heat exchange components is a second heat exchange component, the heat exchange parts of the second heat exchange component are all rigid components, and the first heat exchange component and the second heat exchange component are both heat exchange components arranged on opposite sides of each battery cell along the first direction; 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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