Battery devices and electrical equipment

Abstract

An embodiment of the present application provides a battery device and electrical equipment. The battery device includes a housing, a battery cell group, and a heat exchange assembly. The battery cell group includes a plurality of battery cells stacked along a first direction. The housing includes two side beams arranged opposite each other along the first direction. A heat exchange assembly is provided between the battery cells at both ends of the battery cell group along the first direction and the side beams. The heat exchange assembly includes at least two heat exchange components, at least one of which is configured as a flexible component and at least one of which is configured as a rigid component. In each heat exchange assembly provided between the battery cells at both ends of the battery cell group along the first direction and the side beams, the rigid components are provided on the side facing the battery cells. In the present application, the flexibility of the flexible components can be used to, to a certain extent, block the expansion force of the battery cells from being transmitted to the side beams, thereby improving the deformation resistance of the side beams. Furthermore, the rigid components help to better support the battery cells, thereby improving the positional stability and force uniformity of the battery cells.

Description

Technical Field

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

[0002] In new energy vehicles equipped with battery systems, these systems can provide full or partial power. During use, the battery cells within the system generate heat. Excessive heat generation can negatively impact the performance and service life of the battery system. Therefore, improving the thermal management efficiency of battery cells and enhancing their reliability has become a key research topic in this field. Summary of the Invention

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

[0004] A first aspect of an embodiment of the present application provides a battery device, comprising: a battery cell group comprising a plurality of battery cells stacked along a first direction; a box body, wherein the battery cell group is arranged in the box body, the box body comprising two side beams arranged opposite to each other along the first direction, the side beams being used to constrain the battery cell group; and a heat exchange assembly, wherein the heat exchange assembly is arranged between the battery cells and the side beams at both ends of the battery cell group along the first direction, the heat exchange assembly comprising at least two heat exchange parts, at least one of the heat exchange parts being arranged as a flexible part, and at least one of the heat exchange parts being arranged as a rigid part, the flexible part and the rigid part being stacked to form at least one medium flow channel, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the battery cells, wherein in each of the heat exchange assemblies arranged between the battery cells and the side beams at both ends of the battery cell group along the first direction, the rigid parts are all arranged on the side facing the battery cells.

[0005] In the battery device of the embodiment of the present application, at least one heat exchange component of the heat exchange assembly is configured as a flexible component. The flexible component is lightweight, which helps reduce the weight of the heat exchange component and thereby improves the energy density of the battery device. On the other hand, the flexible component has a certain degree of flexibility, which can make the heat exchange component fit better with the housing and / or battery cells, thereby absorbing the assembly tolerance of the heat exchange component, eliminating the need for caulking agents or thermally conductive materials, improving the fit between the heat exchange component and the housing and / or battery cells, and increasing the effective heat exchange area between the heat exchange component and the housing and / or battery cells, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component. In addition, since the heat exchange component is arranged between the battery cells and the side beams, the flexibility of the flexible component can be used to block the expansion force of the battery cells from being transmitted to the side beams to a certain extent, thereby improving the deformation resistance of the side beams and thereby improving the reliability of the battery device. On the other hand, by setting at least one heat exchange component as a rigid component, the flexible component and the rigid component are stacked to form at least one medium flow channel, the rigid component can support the flexible component, which is beneficial to improving the overall structural strength and stability of the heat exchange component, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange component. Moreover, in each heat exchange component arranged between the battery cell and the side beam, the rigid component is arranged on the side facing the battery cell, which helps to better support the battery cell and improve the position stability and force uniformity of the battery cell.

[0006] In some embodiments, the heat exchange assembly includes a support body, and the support body is disposed in the medium flow channel.

[0007] In this embodiment, by providing a support body in the medium flow channel, the possibility of the flexible parts of the heat exchange component being deformed due to pressure, resulting in a reduction in 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) or even complete closure can be reduced, thereby improving the reliability of thermal management.

[0008] In some embodiments, along the first direction, at least one end of the support body is fixed to the heat exchange element.

[0009] In this embodiment, by fixing at least one end of the support body to the heat exchange element, the position stability of the support body in the medium flow channel can be improved, and the possibility of the support body changing position and generating resistance during the flow of the heat exchange medium can be reduced.

[0010] In some embodiments, the support body includes a columnar portion and a connecting portion connected to the columnar portion. The connecting portion is provided on at least one side of the columnar portion along the first direction, and the connecting portion has a connecting plane provided toward the heat exchange element.

[0011] In this embodiment, the support body includes a columnar portion and a connecting portion. The columnar portion helps reduce the resistance to the flow of the heat exchange medium 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.

[0012] In some embodiments, the support body is an elastic structure.

[0013] In this embodiment, the support body is an elastic structure, which can provide support for the flexible member on the one hand, and on the other hand, can cooperate with the flexible member to deform and absorb the expansion force.

[0014] In some embodiments, the battery device includes a fixing member connecting the heat exchange assembly and the side beam.

[0015] In this embodiment, by providing fixing parts, the stability of the relative position between the heat exchange assembly and the side beam can be improved, and the possibility of the heat exchange assembly losing contact with the battery cell due to displacement can be reduced, thereby helping to further improve the reliability of thermal management.

[0016] In some embodiments, along the first direction, the side of the fixing member facing the heat exchange component forms an abutting plane, and the side facing away from the heat exchange component is fixedly connected to the side beam.

[0017] In this embodiment, by forming an abutment plane on one side of the fixing member facing the heat exchange assembly, a stable and uniform support force can be provided for the heat exchange assembly, thereby improving the deformation resistance of the heat exchange assembly and further improving the reliability of the battery device.

[0018] 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, and along the second direction, the rigid member includes: at least two rigid segments and at least one flexible segment, and the flexible segment connects two adjacent rigid segments.

[0019] In this embodiment, the rigid part is configured to include a rigid section and a flexible section. The flexible section can absorb the stress difference in the second direction by deformation. In this way, the possibility of the rigid part deforming or losing contact with the battery cell due to the stress difference can be reduced, thereby further improving the thermal management reliability.

[0020] In some embodiments, the rigid segments are arranged in a one-to-one correspondence with the battery cells.

[0021] In this embodiment, by arranging the rigid segments in one-to-one correspondence with the battery cell groups, it helps to provide better support for the battery cells, and helps the flexible segments to fully absorb the stress differences caused by the battery cells.

[0022] In some embodiments, in a projection plane perpendicular to the first direction, along the second direction, two ends of the projection of the rigid segment are flush with two ends of the 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.

[0023] In this embodiment, the rigid segment can completely cover the length range of the battery cell along the second direction, which helps to further enhance the supporting force of the rigid segment on the battery cell.

[0024] In some embodiments, the battery device further includes a buffer member, which is disposed between adjacent battery cells along the second direction, and in a projection plane perpendicular to the first direction, a projection of the flexible segment at least partially overlaps with a projection of the buffer member.

[0025] In this embodiment, a buffer member is provided between adjacent battery cells in the second direction, which helps further improve the reliability of the battery device. Furthermore, the projection of the flexible segment and the projection of the buffer member at least partially overlap, thus further enhancing the stress absorption effect through the interaction between the flexible segment and the buffer member.

[0026] In some embodiments, the flexible member comprises a metal plasticized film.

[0027] In this embodiment, since the metal plasticized film is thin and light, and a medium flow channel is formed between the metal plasticized film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange component can be reduced.

[0028] In some embodiments, the flexible member comprises an aluminum-plastic film.

[0029] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0030] In some embodiments, the flexible member is a layered structure, and the flexible member includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0031] In this embodiment, the flexible member, composed of a stack of metal and non-metal layers, is thin and lightweight. It is unaffected by the extrusion process and does not need to meet strict thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly. Furthermore, the heat exchange assembly does not react with the heat exchange medium flowing within it, eliminating the possibility of corrosion or leakage.

[0032] 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.

[0033] By using one or more of aluminum foil, copper foil, and steel foil as the metal layer, the flexible component can have a certain structural strength and can also provide an isolation function. By using one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene as the non-metal layer, the flexible component can have a certain waterproof effect.

[0034] In some embodiments, the non-metallic layer is a hot-melt layer.

[0035] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of hot-melt material, it is beneficial to combine the non-metallic layer and the metal layer through hot melting, which makes the molding simple and the production efficiency high.

[0036] In some embodiments, the thickness of the flexible member is 0.05 mm to 0.3 mm.

[0037] In this embodiment, by setting the thickness of the flexible part to 0.05mm-0.3mm, the heat exchange component made of the flexible part has a certain structural strength while making the overall thickness of the heat exchange component smaller, which is beneficial to reducing the overall volume and weight of the battery device and increasing the energy density of the battery device.

[0038] In some embodiments, the elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

[0039] In this embodiment, by setting the elastic modulus of the flexible part to 0.1MPa-10000MPa, the flexible part can have a certain structural strength, thereby improving the reliability of the heat exchange component, and also have a certain deformation ability, which can improve the fit between the heat exchange component and the box body and / or battery cell, thereby increasing the effective heat exchange area between the heat exchange component and the box body and / or battery cell, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component.

[0040] In some embodiments, the rigid member is configured as a metal plate.

[0041] In this embodiment, by setting the rigid member as a metal plate, the metal plate has both good structural strength and good thermal conductivity.

[0042] A second aspect of the embodiments of the present application provides an electrical device, which includes the battery device of the first aspect of the embodiments of the present application.

[0043] The electrical equipment of the embodiment of the present application has all the advantages of the battery device of any of the above embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1A schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0045] Figure 2 A schematic exploded perspective view of a battery device according to an embodiment of the present application;

[0046] Figure 3 A schematic structural diagram of a heat exchange assembly provided in one embodiment of the present application;

[0047] Figure 4 A schematic structural diagram of a heat exchange assembly provided in one embodiment of the present application from another perspective;

[0048] Figure 5 for Figure 3 AA cross-sectional diagram of ;

[0049] Figure 6 A schematic structural diagram of a rigid component provided in one embodiment of the present application.

[0050] Description of Reference Numerals

[0051] 1000. Vehicle; 100. Battery device; 10. Battery cell group; 11. Battery cell; 20. Casing; 21. Side beam; 30. Heat exchange assembly; 30a. First heat exchange assembly; 30b. Second heat exchange assembly; 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 DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is 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 this application and are not intended to limit this application.

[0053] The specific technical features described in the specific embodiments may be combined in any suitable manner, unless they are inconsistent. For example, different embodiments and technical solutions may be formed by combining different specific technical features. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0054] In the following description, the terms "first, second, ..." are used solely to distinguish different objects and do not imply any similarities or connections between the objects. It should be understood that the directions "above," "below," "outside," and "inside" refer to directions during normal use. The directions "left" and "right" refer to the left-right directions shown in the corresponding schematic diagrams, which may or may not be the left-right directions during normal use.

[0055] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. "A plurality" means greater than or equal to two.

[0056] In the description of this application, the orientation or position relationship of "first direction", "second direction" and "height direction" is based on the orientation or position relationship 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 this 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 cannot be understood as a limitation on this application.

[0057] In the description of the embodiments of the present application, the orientations or positional relationships 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 orientations or positional relationships 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 device or element referred to 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.

[0058] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0059] 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 can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0060] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0061] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0062] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields.

[0063] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0064] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0065] A battery cell typically includes an electrode assembly. This assembly consists of a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed from the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0066] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0067] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0068] In some embodiments, the electrode assembly is a laminate structure.

[0069] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0070] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0071] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0072] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0073] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0074] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0075] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0076] In some embodiments, a battery cell may include an outer shell. This outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be sealed or non-sealed. For example, in a non-sealed outer shell, the outer shell protects the electrode assembly and includes a sealing bag between the outer shell and the electrode assembly, which encapsulates the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. In a sealed outer shell, the outer shell encapsulates the electrode assembly, electrolyte, and other components.

[0077] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0078] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0079] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0080] During the use of the battery device, the battery cells in the battery device will generate heat. If this heat is too high, it will have an adverse effect on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while reducing the weight of the heat exchange component has become an important research direction in this field. In the related art, the battery cells in the battery device are cooled by providing a cooling system in the battery device box. The above-mentioned cooling system may include a plurality of aluminum water-cooling plates laid in the battery device box, and the surfaces of the plurality of water-cooling plates are in contact with the surfaces of the battery cells in the battery device. During use, a heat exchange medium such as water flows through the above-mentioned plurality of water-cooling plates, thereby taking away the heat from the battery cells and cooling the battery cells. However, the battery cells will generate expansion force during use. After the expansion force is transmitted to the above-mentioned water-cooling plates, it will cause the thermal management reliability to decrease, and then cause the use reliability of the battery device to decrease.

[0081] In view of this, in order to improve the reliability of the battery device, an embodiment of the present application provides a battery device, which includes a box, a battery cell group and a heat exchange assembly, the battery cell group includes a plurality of battery cells stacked along a first direction, the battery cell group is arranged in the box, the box includes two side beams arranged opposite to each other along the first direction, the side beams are used to constrain the battery cell group; a heat exchange assembly is arranged between the battery cells at both ends of the battery cell group along the first direction and the side beams, the heat exchange assembly includes at least two heat exchange parts, at least one heat exchange part is arranged as a flexible part, and at least one heat exchange part is arranged as a rigid part, the flexible part and the rigid part are stacked to form at least one medium flow channel, the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with multiple battery cells, wherein, in each heat exchange assembly arranged between the battery cells at both ends of the battery cell group along the first direction and the side beams, each rigid part is arranged on the side facing the battery cell.

[0082] In the battery device of the embodiment of the present application, at least one heat exchange component of the heat exchange assembly is configured as a flexible component. The flexible component is lightweight, which helps reduce the weight of the heat exchange component and thereby improves the energy density of the battery device. On the other hand, the flexible component has a certain degree of flexibility, which can make the heat exchange component fit better with the housing and / or battery cells, thereby absorbing the assembly tolerance of the heat exchange component, eliminating the need for caulking agents or thermally conductive materials, improving the fit between the heat exchange component and the housing and / or battery cells, and increasing the effective heat exchange area between the heat exchange component and the housing and / or battery cells, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component. In addition, since the heat exchange component is arranged between the battery cells and the side beams, the flexibility of the flexible component can be used to block the expansion force of the battery cells from being transmitted to the side beams to a certain extent, thereby improving the deformation resistance of the side beams and thereby improving the reliability of the battery device. On the other hand, by setting at least one heat exchange component as a rigid component, the flexible component and the rigid component are stacked to form at least one medium flow channel, the rigid component can support the flexible component, which is beneficial to improving the overall structural strength and stability of the heat exchange component, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange component. In addition, in each heat exchange component arranged between the battery cell and the side beam at both ends of the battery cell group along the first direction, each rigid component is arranged on the side facing the battery cell, which helps to better support the battery cell and improve the position stability and force uniformity of the battery cell.

[0083] The technical solutions described in the embodiments of this application are applicable to an electrical device using a battery device. The electrical device includes a battery device according to any embodiment of this application, and the battery device is used to provide electrical energy.

[0084] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0085] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0086] Reference Figure 1 , a controller 200, a motor 300 and a battery device 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0087] Reference Figure 2 To meet varying power requirements, the battery device 100 includes multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 11 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the battery cell 11. Multiple battery cells 11 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 11 is housed within the housing 20. Alternatively, the battery device 100 can be constructed by first connecting multiple battery cells 11 in series, in parallel, or in a hybrid configuration to form a battery module. The battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 20. The battery device 100 can also include other structures. For example, the battery device 100 can include a busbar to electrically connect the multiple battery cells 11. Each battery cell 11 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 11 can be cylindrical, flat, rectangular, or have other shapes.

[0088] Reference Figure 2-Figure 6The embodiment of the present application provides a battery device 100, which includes a housing 20, a battery cell group 10, and a heat exchange assembly 30. The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction. The battery cell group 10 is disposed in the housing 20. The housing 20 includes two side beams 21 disposed opposite to each other along the first direction. The side beams 21 are used to constrain the battery cell group 10. The heat exchange assembly 30 is disposed between the battery cells 11 at the ends of the battery cell group 10 along the first direction and the side beams 21. The heat exchange assembly 30 includes at least two heat exchange members, at least one of which is configured as a flexible member 31 and at least one of which is configured as a rigid member 32. The flexible member 31 and the rigid member 32 are stacked to form at least one medium flow channel 33. The at least one medium flow channel 33 is used to conduct a heat exchange medium, which is used to exchange heat with the plurality of battery cells 11. The rigid member 32 is disposed on the side facing the battery cells 11.

[0089] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0090] Please refer to Figure 2 The battery device 100 includes a box body 20 and a battery cell group 10 . The battery cell group 10 is disposed in the box body 20 .

[0091] The housing 20 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing 20 may be made of an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0092] The box body 20 is used to encapsulate the battery cells 11 . The box body 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 11 .

[0093] For example, the box 20 is generally a rectangular parallelepiped structure, the length and width of the box 20 are parallel to the horizontal plane, and the length of the box 20 is parallel to the longest side of the rectangular parallelepiped structure of the box 20. The height of the box 20 is perpendicular to the ground.

[0094] The battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction. For example, the first direction is perpendicular to the major surface of the battery cell 11. The major surface here specifically refers to the surface with the largest area among the various surfaces of the battery cell 11. For example, taking the case 20 as a rectangular parallelepiped structure, the first direction can be the length or width of the case 20.

[0095] The battery device 100 may include one or more battery cell groups 10. When the battery device 100 includes multiple battery cell groups 10, the multiple battery cell groups 10 are distributed along the second direction to form a battery cell array. Here, the second direction intersects with the first direction, and both the first direction and the second direction are perpendicular to the height direction of the box body 20. As an example, the first direction is the length direction of the box body 20, and the second direction is the height direction of the box body 20.

[0096] The housing 20 includes two side beams 21 disposed opposite each other along a first direction. The side beams 21 are used to constrain the battery cell group 10. Here, the side beams 21 are generally referred to as expansion beams of the housing 20. The side beams 21 are used to constrain the battery cell group 10 along the first direction and withstand the expansion force from the battery cells 11.

[0097] The heat exchange assembly 30 is arranged between the battery cells 11 at the end of the battery cell group 10 along the first direction and the side beam 21. In other words, a heat exchange assembly 30 is arranged between the two battery cells 11 at both ends of the battery cell group 10 along the first direction and the corresponding side beam 21.

[0098] The heat exchange assembly 30 includes at least two heat exchange elements, which are stacked in a first direction to form at least one medium flow channel 33 . The at least one medium flow channel 33 is used to conduct a heat exchange medium, which is used to exchange heat with the battery cell 11 .

[0099] At least two heat exchange elements are stacked to form at least one medium flow channel 33. This means that a medium flow channel 33 is formed between two adjacent heat exchange elements. In other words, one of the two adjacent heat exchange elements forms at least a portion of the sidewall of the medium flow channel 33, and the other heat exchange element also forms at least a portion of the sidewall of the medium flow channel 33. The heat exchange medium circulates within the medium flow channel 33 to exchange heat with the battery cells 11.

[0100] As an example, of two adjacent heat exchange elements, one has a recessed surface facing the other, forming a flow channel groove. The other has a flat surface facing the first, which, together with the flow channel groove, forms the medium flow channel 33. Alternatively, the surfaces of the two adjacent heat exchange elements facing each other are both recessed, forming flow channels. The two flow channels form the medium flow channel 33.

[0101] 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 a heat exchange effect on the battery cell 11. For example, it can be gaseous or liquid. In the embodiment of the present application, the heat exchange medium is described as a coolant.

[0102] The specific number of the medium flow channels 33 is not limited here and can be one or more.

[0103] The heat exchange assembly 30 may include three or more heat exchange elements. In this case, a medium flow channel 33 may be formed between every two adjacent heat exchange elements.

[0104] The principle of heat exchange of the battery cell 11 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 33 through the inlet of the heat exchange component 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 component 30, completing the heat exchange of the battery cell 11.

[0105] Here, the heat exchange component 30 exchanging heat with the battery cell 11 may be to dissipate heat from the battery cell 11 or to heat the battery cell 11 .

[0106] The principle of heat dissipation of the battery cell 11 by the heat exchange component 30 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange component 30. After the heat exchange medium absorbs the heat generated by the battery cell 11 during operation, the heat exchange medium flows out through the outlet of the heat exchange component 30, releasing the heat, thereby completing the cooling and heat dissipation of the battery cell 11.

[0107] The principle of the heat exchange component 30 heating the battery cell 11 is as follows: the heat exchange medium output by the heat exchange medium source enters the medium flow channel 33 through the inlet of the heat exchange component 30, and the heat exchange medium transfers heat to the battery cell 11. After heating the battery cell 11, the heat exchange medium flows out through the outlet of the heat exchange component 30, completing the heating of the battery cell 11.

[0108] In this embodiment, among the at least two heat exchange components of the heat exchange assembly 30, at least one heat exchange component is configured as a flexible component 31, and at least one heat exchange component is configured as a rigid component 32. The flexible component 31 and the rigid component 32 are stacked to form at least one medium flow channel 33.

[0109] Here, the flexibility of flexible member 31 refers to the material properties of the structure. This type of property can be attributed to the material due to its light weight, or it can be attributed to at least one of the material's properties, such as thickness, stiffness, strength, and elastic modulus. As an example, the material of flexible member 31 can be selected to be lighter than conventional structures such as aluminum or steel plates, and its flexibility can be controlled by the thickness, width, length, and material type of flexible member 31.

[0110] In the embodiment of the present application, the heat exchange assembly 30 is configured to include a flexible member 31 , which helps to reduce the weight of the heat exchange assembly 30 and thereby improve the energy density of the battery device 100 .

[0111] Furthermore, the flexible part 31 has certain expandable or contractible properties. It can also be understood that the flexible part 31 can be an elastically deformable structure. The flexible part 31 has the ability to deform and recover deformation, so that the heat exchange component 30 can adapt to the external contour shape of the battery cell 11 or other components through a certain elastic deformation to improve the fit between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby improving the heat exchange efficiency.

[0112] Furthermore, the above characteristics enable the flexible member 31 to absorb the expansion force of the battery cell 11 by deformation, thereby blocking the transmission of the expansion force to the side beam 21 to a certain extent, improving the deformation resistance of the side beam 21, and further improving the reliability of the battery device 100.

[0113] Here, the rigidity of rigid member 32 refers to the material properties of the structure. This type of property can be attributed to the material due to its heavy mass, or due to at least one of its thickness, stiffness, strength, and elastic modulus. For example, the material of rigid member 32 can be selected from conventional metal plates such as aluminum and steel plates, or structural materials such as composite plates. Its rigidity can be controlled by the thickness, width, length, and material type of rigid member 32.

[0114] In this embodiment, in each heat exchange assembly 30 arranged between the battery cell 11 and the side beam 21 at the end of the battery cell group 10 along the first direction, the rigid parts 32 are all arranged toward the battery cell 11. Compared with the flexible parts 31 arranged toward the battery cell 11, this helps to better support the battery cell 11 and improve the position stability and force uniformity of the battery cell 11.

[0115] It should be noted that, in some embodiments, the location of the heat exchange assembly 30 is not limited to between the battery cell 11 at the end of the battery cell group 10 and the side beam 21. The above-mentioned heat exchange assembly 30 can also be set between adjacent battery cells 11 along the first direction. For the heat exchange assembly 30 arranged between adjacent battery cells 11, the specific orientation of its rigid parts 32 and flexible parts 31 is not restricted. The orientation of the rigid parts 32 of each heat exchange assembly 30 arranged between adjacent battery cells 11 can be the same or different.

[0116] In the battery device 100 of the embodiment of the present application, at least one heat exchange component of the heat exchange assembly 30 is configured as a flexible component 31. The flexible component 31 is lightweight, which helps to reduce the weight of the heat exchange assembly 30 and thereby improve the energy density of the battery device 100.

[0117] On the other hand, the flexible member 31 has a certain degree of flexibility, which allows the heat exchange assembly 30 to better fit with the housing 20 and / or the battery cell 11, thereby facilitating the absorption of assembly tolerances of the heat exchange assembly 30 and eliminating the need for caulking agents or thermally conductive materials. This improves the fit of the heat exchange assembly 30 with the housing 20 and / or the battery cell 11, increases the effective heat exchange area between the heat exchange assembly 30 and the housing 20 and / or the battery cell 11, and thereby improves the heat exchange efficiency and effect of the heat exchange assembly 30. Furthermore, since the heat exchange assembly 30 is disposed between the battery cell 11 and the side beam 21, the flexibility of the flexible member 31 can, to a certain extent, block the transmission of the expansion force of the battery cell 11 to the side beam 21, thereby improving the deformation resistance of the side beam 21 and thereby enhancing the reliability of the battery device 100.

[0118] On the other hand, by setting at least one heat exchange component as a rigid component 32, the flexible component 31 and the rigid component 32 are stacked to form at least one medium flow channel 33. The rigid component 32 can support the flexible component 31, which is beneficial to improving the overall structural strength and stability of the heat exchange component 30, and further improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30. Moreover, in each heat exchange component 30 arranged between the battery cell 11 and the side beam 21 at the end of the battery cell group 10 along the first direction, the rigid component 32 is arranged on the side facing the battery cell 11, which helps to better support the battery cell 11 and improve the position stability and force uniformity of the battery cell 11.

[0119] In some embodiments, the heat exchange assembly 30 includes a support body 34 , which is disposed in the medium flow channel 33 .

[0120] Here, the specific structural form of the support body 34 is not limited. The support body 34 can be a rigid structure or a flexible structure. As an example, the elastic modulus of the support body 34 is greater than the elastic modulus of the flexible part 31 and less than the elastic modulus of the rigid part 32.

[0121] It is understood that a gap must be formed between the support body 34 and the wall of the medium flow channel 33 to allow the medium to flow. As an example, the support body 34 is an entire strip-shaped structure, with its axis roughly parallel to the central axis of the medium flow channel 33. At least one end of the support body 34 along the first direction can abut against the heat exchange element, or opposite ends of the support body 34 along the first direction can abut against two heat exchange elements, thereby enhancing its support effect.

[0122] In this embodiment, by providing a support body 34 in the medium flow channel 33, the possibility of the flexible part 31 of the heat exchange component 30 being deformed due to pressure, resulting in a reduction in the effective cross-sectional area (the area of the cross section perpendicular to the flow direction of the heat exchange medium) of the medium flow channel 33 or even complete closure can be reduced, thereby improving the reliability of thermal management.

[0123] In some embodiments, along the first direction, at least one end of the support body 34 is fixed to the heat exchange element.

[0124] Here, the specific implementation method of fixing the support body 34 and the heat exchange element is not limited, such as bonding, clamping, welding, etc., or the support body 34 and the heat exchange element form an integrated structure.

[0125] The support body 34 can be fixed to the heat exchange element at only one end along the first direction, or at both opposite ends. In comparison, the support body 34 can be fixed to the heat exchange element at one end along the first direction and not fixed to the heat exchange element at the other end, which helps to reduce the difficulty of assembly.

[0126] In this embodiment, by fixing at least one end of the support body 34 to the heat exchange element, the position stability of the support body 34 in the medium flow channel 33 can be improved, and the possibility of the support body 34 changing position and generating resistance during the flow of the heat exchange medium can be reduced.

[0127] In some embodiments, reference Figure 5 The support body 34 includes a columnar portion 341 and a connecting portion 342 connected to the columnar portion 341. Along the first direction, the connecting portion 342 is provided on at least one side of the columnar portion 341. The connecting portion 342 has a connecting plane provided toward the heat exchange element.

[0128] 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.

[0129] Here, the connecting portion 342 may be provided on one side of the columnar portion 341 along the first direction, or may be provided on both opposite sides of the columnar portion 341 along the first direction. The connecting plane of the connecting portion 342 may abut against the heat exchange element, or may be further fixed relative to the heat exchange element, and the fixing method is not limited, such as bonding, welding, etc.

[0130] As an example, when connecting parts 342 are provided on both 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.

[0131] 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.

[0132] In some embodiments, the support body 34 is an elastic structure.

[0133] 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.

[0134] As an example, the elastic structure herein refers to a structure having an elastic modulus higher than that of the flexible member 31 and lower than that of the rigid member 32 .

[0135] In this embodiment, the support body 34 is an elastic structure. On the one hand, it can provide support for the flexible member 31 . On the other hand, it can also cooperate with the flexible member 31 to deform and absorb the expansion force.

[0136] In some embodiments, reference Figure 2 The battery device 100 includes a fixing member 40 , which connects the heat exchange assembly 30 and the side beam 21 .

[0137] Here, the specific structural form of the fixing member 40 is not limited, as long as it can achieve relative fixation between the heat exchange assembly 30 and the side beam 21.

[0138] In this embodiment, by providing a fixing member 40, the stability of the relative position between the heat exchange assembly 30 and the side beam 21 can be improved, and the possibility of the heat exchange assembly 30 losing contact with the battery cell 11 due to displacement can be reduced, thereby helping to further improve the reliability of thermal management.

[0139] In some embodiments, reference Figure 2 Along the first direction, one side of the fixing member 40 facing the heat exchange assembly 30 forms a contact plane 40 a, and the other side is fixedly connected to the side beam 21 .

[0140] As an example, in a projection plane perpendicular to the first direction, the projection of the abutting plane 40 a covers the projection of the heat exchange assembly 30 .

[0141] The abutting plane 40a and the heat exchange component 30 may only abut against each other without being fixedly connected, or the abutting plane 40a may be connected to the heat exchange component 30 by bonding, welding, or the like.

[0142] The specific implementation method of the fixed connection between the fixing member 40 and the side beam 21 is not limited, such as bonding, welding, clamping, fastener connection, etc. The fixing member 40 and the side beam 21 can be directly connected or connected only by other intermediate structures.

[0143] In this embodiment, by forming a supporting plane 40a on one side of the fixing member 40 facing the heat exchange assembly 30, a stable and uniform supporting force can be provided for the heat exchange assembly 30, thereby improving the deformation resistance of the heat exchange assembly 30 and further improving the reliability of the battery device 100.

[0144] 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 11 array, the first direction intersects the second direction, and along the second direction, the rigid member 32 includes: at least two rigid segments 321 and then at least one flexible segment 322, and the flexible segment 322 connects two adjacent rigid segments 321.

[0145] Similar to flexible member 31, the flexibility of flexible segment 322 refers to the material properties of the structure. This type of property can be attributed to the material's light weight, or it can be attributed to at least one of the material's properties, such as thickness, stiffness, strength, and elastic modulus. For example, the material of flexible segment 322 can be selected to be lighter than conventional aluminum or steel plates, and its flexibility can be controlled by the thickness, width, length, and material type of flexible segment 322.

[0146] As an example, the material of the flexible section 322 is the same as that of the flexible member 31 .

[0147] In this embodiment, the flexible segment 322 and the rigid segment 321 can be connected in any manner, such as by welding or bonding. For example, the flexible segment 322 can be connected to one end surface of the rigid segment 321 along the second direction. As another example, a portion of the flexible segment 322 can be stacked with the rigid segment 321 along the first direction to increase the contact area between the two and thereby enhance the stability of the connection.

[0148] It can be understood that when multiple battery cell groups 10 are distributed along the second direction, there are certain differences in the stress distribution of the heat exchange component 30 along the second direction. This stress difference may be due to the different expansion forces of the battery cells 11 and / or the different acceleration impacts of each battery cell 11 when the battery device 100 moves. For the flexible part 31, it can absorb this stress difference, but for the rigid part 32, this stress difference may cause it to undergo local deformation and / or cause it to shift and lose contact with certain battery cells 11.

[0149] To this end, in this embodiment, the rigid part 32 is configured to include a rigid section 321 and a flexible section 322. The flexible section 322 can absorb the stress difference in the second direction by deformation. In this way, the possibility of the rigid part 32 being deformed or losing contact with the battery cell 11 due to the stress difference can be reduced, thereby further improving the thermal management reliability.

[0150] In some embodiments, the rigid segments 321 are provided in a one-to-one correspondence with the battery cells 11. Here, the one-to-one correspondence between the rigid member 32 and the battery cells 11 specifically means that the number of rigid segments 321 in the rigid member 32 is the same as the number of battery cells 11 in a row distributed along the second direction (i.e., the number of battery cell groups 10), and in a projection plane perpendicular to the first direction, the projection of the rigid segment 321 at least partially overlaps with the projection of the corresponding battery cell 11.

[0151] In this embodiment, by arranging the rigid segments 321 in one-to-one correspondence with the battery cell groups 10 , it helps to provide better support for the battery cells 11 , and it helps to enable the flexible segments 322 to fully absorb the stress differences caused by the battery cells 11 .

[0152] In some embodiments, in a projection plane perpendicular to the second direction, along the second direction, both ends of the projection of the rigid segment 321 are flush with both ends of the projection of the corresponding battery cell 11 , or both ends of the projection of the rigid segment 321 exceed both ends of the projection of the corresponding battery cell 11 .

[0153] In this embodiment, the rigid section 321 can completely cover the length range of the battery cell 11 along the second direction, which helps to further enhance the supporting force of the rigid section 321 on the battery cell 11 .

[0154] In some embodiments, reference Figure 2 The battery device 100 further includes a buffer 50 , which is disposed between adjacent battery cells 11 along the second direction. In a projection plane perpendicular to the first direction, a projection of the flexible segment 322 at least partially overlaps with a projection of the buffer 50 .

[0155] Here, the buffer member 50 is mainly used to absorb stress between adjacent battery cells 11 along the second direction. As an example, the buffer member 50 is an elastic pad structure.

[0156] In this embodiment, a buffer member 50 is disposed between adjacent battery cells 11 in the second direction, thereby further improving the reliability of the battery device 100. Furthermore, the projection of the flexible segment 322 at least partially overlaps with the projection of the buffer member 50. Thus, the interaction between the flexible segment 322 and the buffer member 50 further enhances the stress absorption effect.

[0157] In some embodiments, reference Figure 2 The heat exchange component 30 has an inlet 35 and an outlet 36 connected to the medium flow channel 33. The inlet 35 and the outlet 36 are respectively arranged on opposite sides of the heat exchange component 30 in the second direction, and the second direction intersects with the first direction.

[0158] Here, the inlet member 35 and the outlet member 36 are used to allow the heat exchange medium to flow into and out of the medium flow channel 33, respectively. As an example, the inlet member 35 and the outlet member 36 include water nozzles.

[0159] In this embodiment, by arranging the inlet member 35 and the outlet member 36 on opposite sides of the heat exchange assembly 30 along the second direction, it helps to reduce the difficulty of arranging the pipelines in the box body 20.

[0160] 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.

[0161] In some embodiments, still referring to Figure 2 The battery device 100 includes an inlet pipe 60 and an outlet pipe 70. The inlet pipe 60 is connected in series to the inlet parts 35 of each heat exchange assembly 30, and the outlet pipe 70 is connected in series to the outlet parts 36 of each heat exchange assembly 30. The inlet end 61 of the inlet pipe 60 and the outlet end 71 of the outlet pipe 70 are located on the same side of the battery cell group 10 along the first direction.

[0162] Here, the inlet pipe 60 connected in series with the inlet piece 35 of each heat exchange assembly 30 specifically means that the inlet pipe 60 connects the inlet piece 35 of the heat exchange assembly 30 with the inlet piece 35 of another adjacent heat exchange assembly 30. The outlet pipe 70 connected in series with the outlet piece 36 of each heat exchange assembly 30 specifically means that the inlet pipe 60 connects the outlet piece 36 of the heat exchange assembly 30 with the outlet piece 36 of another adjacent heat exchange assembly 30.

[0163] The inlet end 61 of the inlet pipe 60 specifically refers to the end through which the heat exchange medium flows into the inlet pipe 60 , and the outlet end 71 of the outlet pipe 70 specifically refers to the end through which the heat exchange medium flows out of the outlet pipe 70 .

[0164] The inlet end 61 and the outlet end 71 are specifically arranged between the above-mentioned heat exchange component 30 and the side beam 21. In the embodiment where the above-mentioned battery device 100 includes a 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.

[0165] In this embodiment, this piping connection method helps ensure that the temperature of the heat exchange medium entering each heat exchange assembly 30 is approximately the same, thereby providing better heat dissipation for each battery cell 11 in the first direction and improving the temperature uniformity of the battery cells 11. Furthermore, this piping connection method enables the inlet port 61 and the outlet port 71 to be located on the same side of the battery cell 11, that is, on the same side of the housing 20, thus facilitating connection with an external heat exchange medium source during actual use.

[0166] In some embodiments, the flexible member 31 includes a metal plasticized film.

[0167] The flexible member 31 is a single-layer or multi-layer film.

[0168] Here, the metal-plasticized film is a metal-plastic composite material, that is, it includes a metal layer and a plastic layer, and the plastic layer forms the above-mentioned insulating layer.

[0169] In this embodiment, since the metal plastic film is thin and light, and the medium flow channel 33 is formed between the metal plastic film and the heat exchange component, it is not affected by the extrusion process and does not need to meet a larger thickness requirement, so the overall thickness and weight of the heat exchange component 30 can be reduced.

[0170] In some embodiments, the flexible member 31 comprises an aluminum-plastic film.

[0171] Aluminum-plastic film has high barrier properties, good cold stamping formability, puncture resistance, electrolyte stability, and electrical insulation.

[0172] In some embodiments, the flexible member 31 is a layered structure, and the flexible member 31 includes a metal layer and a non-metal layer, and the metal layer and the non-metal layer are stacked in sequence.

[0173] 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.

[0174] As an example, the metal layer and the non-metal layer may be formed by hot pressing or hot melting.

[0175] There is no limit on the number of metal layers and non-metal layers.

[0176] In this embodiment, the flexible member 31, composed of a stack of metal and non-metal layers, is thin and lightweight. It is not affected by the extrusion process and does not need to meet strict thickness requirements, thereby reducing the overall thickness and weight of the heat exchange assembly 30. Furthermore, the heat exchange assembly 30 does not react with the heat exchange medium flowing within it, eliminating the possibility of corrosion or leakage.

[0177] In some embodiments, the metal layer includes one or more of aluminum foil, copper foil, and steel foil.

[0178] By setting the metal layer to 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.

[0179] In some embodiments, the non-metallic layer includes one or more of polypropylene, polyphenylene sulfide, polyphthalamide, and polyethylene.

[0180] By setting the non-metallic layer to be one or more of polypropylene, polyphenylene sulfide, polyphthalamide and polyethylene, the flexible member 31 can have a certain waterproof effect.

[0181] As an example, a non-metallic layer made of a corrosion-resistant material having acid and alkali corrosion resistance may be selected, or in other words, additives may be added to the non-metallic layer to make the non-metallic layer have acid and alkali corrosion resistance.

[0182] In some embodiments, the non-metallic layer is a hot melt layer.

[0183] In this embodiment, by setting the non-metallic layer as a hot-melt layer, that is, composed of hot-melt material, it is beneficial to combine the non-metallic layer and the metal layer through hot melting, which makes the molding simple and the production efficiency high.

[0184] In some embodiments, the thickness of the flexible member 31 is 0.05 mm to 0.3 mm.

[0185] As an example, the thickness of the flexible member 31 is any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, 0.3 mm, or any value therebetween.

[0186] In this embodiment, by setting the thickness of the flexible part 31 to 0.05mm-0.3mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength while making the overall thickness of the heat exchange component 30 smaller, which is beneficial to reducing the overall volume and weight of the battery device 100, thereby increasing the energy density of the battery device 100.

[0187] In some embodiments, the thickness of the flexible member 31 is 0.08 mm to 0.2 mm.

[0188] As an example, the thickness of the flexible member 31 is any one of 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, and 0.2 mm, or any value therebetween.

[0189] In this embodiment, by setting the thickness of the flexible part 31 to 0.08mm-0.2mm, the heat exchange component 30 made of the flexible part 31 has a certain structural strength, while further making the overall thickness of the heat exchange component 30 smaller, which is beneficial to further reduce the overall volume and weight of the battery device 100, thereby further increasing the energy density of the battery device 100.

[0190] In some embodiments, the elastic modulus of the flexible member 31 is 0.1 MPa-10000 MPa.

[0191] As an example, the elastic modulus of the flexible part 31 can be any one of 0.1 MPa, 1 MPa, 50 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 800 MPa, 1000 MPa, 1300 MPa, 1500 MPa, 1800 MPa, 2000 MPa, 2500 MPa, 2800 MPa, 3000 MPa, 3500 MPa, 4000 MPa, 4500 MPa, 5000 MPa, 5500 MPa, 6000 MPa, 6500 MPa, 7000 MPa, 7500 MPa, 8000 MPa, 8500 MPa, 8800 MPa, 9000 MPa, 9500 MPa, 9700 MPa, and 10000 MPa, or any point value between any two of them.

[0192] The elastic modulus describes the unit strain caused by unit stress when a solid is subjected to a certain force range. It is one of the fundamental physical quantities of a material. The larger the elastic modulus, the greater the material's stiffness and compressive resistance. The elastic modulus is a physical quantity that describes the elasticity of a material.

[0193] The elastic modulus of the flexible member 31 may be measured by at least one of a static tensile test method, a dynamic test method, a sonic velocity method, a nanoindentation method, and a bending method. The measuring instrument may include a nanoindenter and a universal testing machine.

[0194] For example, the elastic modulus of the flexible member 31 can be measured at room temperature and pressure by nanoindentation. The nanoindentation method uses a tiny indenter to indent the surface of the flexible member 31 and calculates the elastic modulus by analyzing the relationship between the indentation depth and the load.

[0195] In this embodiment, by setting the elastic modulus of the flexible part 31 to 0.1MPa-10000MPa, the flexible part 31 has a certain structural strength, thereby improving the reliability of the heat exchange component 30, and has a certain deformation ability, which can improve the fit between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby increasing the effective heat exchange area between the heat exchange component 30 and the box body 20 and / or the battery cell 11, thereby improving the heat exchange efficiency and heat exchange effect of the heat exchange component 30.

[0196] In some embodiments, the elongation at break of the flexible member 31 is greater than that of the rigid member 32. Elongation at break is the percentage of the elongation at break of a material compared to its original length. It measures the material's ability to withstand deformation during stretching; that is, elongation at break indicates the material's ability to stretch when subjected to tension.

[0197] The elongation at break of the flexible member 31 is greater than the elongation at break of the rigid member 32 . In other words, when subjected to tension, the ductility of the flexible member 31 is greater than the ductility of the rigid member 32 .

[0198] In some embodiments, the elongation at break of the flexible member 31 is in a range of 30% to 300%.

[0199] The elongation at break of the flexible member 31 may be any one of 30%, 50%, 60%, 80%, 90%, 100%, 130%, 150%, 160%, 170%, 190%, 200%, 220%, 150%, 260%, 280%, 290%, 300%, or any value between any two of them.

[0200] In this embodiment, by setting the elongation at break of the flexible member 31 to be in the range of 30% to 300%, the flexible member 31 can have certain impact resistance and puncture resistance while also having certain structural strength.

[0201] In some embodiments, the elongation at break of the rigid member 32 is in a range of 1% to 50%.

[0202] The elongation at break of the rigid member 32 may be any one of 1%, 3%, 5%, 6%, 8%, 9%, 10%, 13%, 15%, 16%, 17%, 19%, 20%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 43%, 45%, 48%, 50%, or any value therebetween.

[0203] In this embodiment, by setting the elongation at break of the rigid component 32 to be in the range of 1% to 50%, the rigid component 32 can have sufficient structural strength, thereby facilitating improvement of the overall structural strength of the heat exchange assembly 30 .

[0204] In some embodiments, the rigid member 32 is configured as a metal plate.

[0205] As an example, the rigid member 32 may be an aluminum alloy plate, and the outer surface of the plate may be insulated.

[0206] In this embodiment, by setting the rigid member 32 as a metal plate, the metal plate has both good structural strength and good thermal conductivity.

[0207] In some embodiments, reference Figure 2 , heat exchange components 30 are provided on two opposite sides of each battery cell 11 along the first direction.

[0208] Heat exchange assemblies 30 are installed on opposite sides of each battery cell 11 along the first direction. That is, heat exchange assemblies 30 are installed between adjacent battery cells 11 along the first direction, and heat exchange assemblies 30 are also installed between the battery cells 11 at the ends and the casing 20. This maximizes the contact area between the heat exchange assemblies 30 and the battery cells 11, thereby improving heat exchange efficiency.

[0209] In some embodiments, the battery device 100 may include multiple heat exchange assemblies 30. In addition to the heat exchange assembly 30 mentioned above in which at least one heat exchange component is a rigid component 32 and at least one heat exchange component is a flexible component 31, there may also be at least one heat exchange assembly 30 in which all heat exchange components are rigid components 32. For ease of distinction, the heat exchange assembly 30 in which at least one heat exchange component is a rigid component 32 and at least one heat exchange component is a flexible component 31 is referred to herein as a first heat exchange assembly 30a, and the heat exchange assembly 30 in which all heat exchange components are rigid components 32 is referred to as a second heat exchange assembly 30b.

[0210] In the embodiment where the battery device 100 includes both the first heat exchange component 30a and the second heat exchange component 30b, refer to Figure 2 The heat exchange components 30 provided between two adjacent battery cells 11 along the first direction may both be second heat exchange components 30b, or may have a portion being the first heat exchange component 30a and the other portion being the second heat exchange component 30b.

[0211] In the battery device 100 provided in the embodiment of the present application, heat exchange components 30 are provided on opposite sides of the battery cell 11 along the first direction. In this way, the heat exchange area between the battery cell 11 and the heat exchange component 30 is increased, thereby helping to improve the thermal management efficiency and facilitate rapid cooling in the event of thermal runaway.

[0212] 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 lightweight, which helps reduce the weight of the heat exchange assembly 30 and thereby improve the energy density of the battery device 100 .

[0213] 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 body 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 case 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.

[0214] 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, reducing the possibility of partial heat exchange component 30 being out of contact with the battery cell 11 due to 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.

[0215] In some embodiments, reference Figure 2 A second heat exchange assembly 30b is provided on at least one side of each battery cell 11 along the first direction.

[0216] Here, a 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, of the two heat exchange components 30 on opposite sides of each battery cell 11 along the first direction, at least one is a 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.

[0217] In this embodiment, by providing 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 of the battery cell 11 being out of contact with the heat exchange assembly 30 on both sides along the first direction, thereby further improving the reliability of thermal management.

[0218] In some embodiments, reference Figure 2 , along the first direction, the first heat exchange components 30a and the second heat exchange components 30b are alternately arranged.

[0219] In this embodiment, one side of each battery cell 11 along the first direction can be the first heat exchange component 30a, and the other side can be the second heat exchange component 30b, which helps to balance the absorption of expansion force and the stability of support, thereby further improving the reliability of thermal management.

[0220] The battery device 100 provided in the embodiment of the present application is further described below with reference to a specific embodiment.

[0221] Reference Figure 2-Figure 6 The battery device 100 includes a housing 20, a battery cell group 10, and a heat exchange assembly 30. The battery cell group 10 is disposed in the housing 20. The battery cell group 10 includes a plurality of battery cells 11 stacked along a first direction. As an example, the first direction is perpendicular to the large surface of the battery cell 11.

[0222] The box body 20 includes two side beams 21 arranged opposite to each other along a first direction, and the side beams 21 are used to constrain the battery cell group 10. The heat exchange assembly 30 is arranged between the battery cell 11 and the side beams 21 at the end of the battery cell group 10 along the first direction. The heat exchange assembly 30 includes at least two heat exchange parts, at least one heat exchange part is set as a flexible part 31, and at least one heat exchange part is set as a rigid part 32. The flexible part 31 and the rigid part 32 are stacked to form at least one medium flow channel 33. 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 multiple battery cells 11.

[0223] The battery device 100 includes a fixing member 40 , which connects the first heat exchange assembly 30 a and the side beam 21 .

[0224] The heat exchange assembly 30 includes a support body 34, which is arranged in the medium flow channel 33. The support body 34 is an elastic structure. The support body 34 includes a columnar portion 341 and a connecting portion 342 connected to the columnar portion 341. Along the first direction, the connecting portion 342 is set on at least one side of the columnar portion 341, and the connecting portion 342 has a connecting plane set toward the heat exchange element.

[0225] An embodiment of the present application further provides an electrical device, which includes the battery device 100 described in any of the above embodiments.

[0226] The electrical equipment of the embodiment of the present application has all the advantages of the battery device 100 described in any of the above embodiments, which will not be repeated here.

[0227] In the description of this application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and features of different embodiments or examples without contradiction.

[0228] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery device, characterized in that: The battery device comprises: A battery cell group includes a plurality of battery cells stacked along a first direction, wherein the first direction is perpendicular to a large surface of the battery cells, the large surface being the surface with the largest area among the surfaces of the battery cells; a box body, wherein the battery cell group is disposed in the box body, the box body comprising two side beams disposed opposite to each other along the first direction, the side beams being used to constrain the battery cell group; and A heat exchange assembly, wherein the heat exchange assembly is arranged between the battery cells and the side beams at both ends of the battery cell group along the first direction, and the heat exchange assembly includes at least two heat exchange parts, at least one of which is arranged as a flexible part, and at least one of which is arranged as a rigid part, and the flexible part and the rigid part are stacked to form at least one medium flow channel, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cells, wherein, in each of the heat exchange assemblies arranged between the battery cells and the side beams at both ends of the battery cell group along the first direction, the rigid parts are all arranged on the side facing the battery cells.

2. The battery device according to claim 1, wherein: The heat exchange component includes a support body, and the support body is arranged in the medium flow channel.

3. The battery device according to claim 2, characterized in that Along the first direction, at least one end of the support body is fixed to the heat exchange element.

4. The battery device according to claim 2, wherein: The support body includes a columnar portion and a connecting portion connected to the columnar portion. The connecting portion is provided on at least one side of the columnar portion along the first direction. The connecting portion has a connecting plane disposed toward the heat exchange element.

5. The battery device according to claim 4, characterized in that The support body is an elastic structure.

6. The battery device according to claim 1, wherein: The battery device includes a fixing member, which connects the heat exchange component and the side beam.

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

8. The battery device according to claim 1, wherein: The 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, the rigid member includes: at least two rigid segments and at least one flexible segment, and the flexible segment connects two adjacent rigid segments.

9. The battery device according to claim 8, characterized in that The rigid sections are arranged in one-to-one correspondence with the battery cells.

10. The battery device according to claim 9, 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.

11. The battery device according to claim 8, characterized in that The battery device further includes a buffer member, which is disposed between adjacent battery cells along the second direction. 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.

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

13. The battery device according to claim 12, characterized in that The flexible member comprises an aluminum-plastic film.

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

15. The battery device according to claim 14, 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.

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

17. The battery device according to any one of claims 1 to 11 and 15 to 16, characterized in that: The thickness of the flexible member is 0.05mm-0.3mm.

18. The battery device according to any one of claims 1 to 11 and 15 to 16, characterized in that: The elastic modulus of the flexible member is 0.1 MPa-10000 MPa.

19. The battery device according to any one of claims 1 to 11 and 15 to 16, characterized in that: The rigid member is configured as a metal plate.

20. An electrical device, characterized in that: The electrical equipment comprises the battery device according to any one of claims 1-19.

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