Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device, the battery device comprising: a box body; a battery cell assembly comprising a plurality of battery cells arranged in a first direction; a flexible heat exchange element comprising: a flexible film and a support framework connected to the flexible film and supporting the flexible film, a heat exchange channel for accommodating a heat exchange medium being formed in the flexible heat exchange element, the flexible heat exchange element being in heat exchange with the battery cell assembly through the flexible film, and the flexible heat exchange element and the pole of the battery cell being arranged on the same side of the battery cell assembly in a second direction. In the above technical solution, the flexible film realizes flexible fitting with the battery cell, improves the heat exchange efficiency, the support framework improves the structural strength of the flexible heat exchange element, improves the fitting stability between the flexible heat exchange element and the battery cell, the flexible heat exchange element and the pole of the battery cell are arranged on the same side, improves the heat dissipation capacity of the area where the pole is located, and improves the overall operation reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] In the field of battery technology, flexible cold plates are often bonded to the side wall of the battery cell using a single-sided thermally conductive adhesive full-width bonding method. Because the flexible cold plate is made of flexible material, the bonding reliability of this method is poor. After the flexible cold plate is filled with coolant, it is easy to cause local bulging and warping deformation, resulting in a large area of ​​separation between the cold plate and the side wall of the battery cell and the formation of air gaps, which significantly increases the contact thermal resistance and causes a significant reduction in heat dissipation efficiency. Utility Model Content

[0003] This application aims to at least address one of the technical problems existing in the prior art. To this end, this application proposes a battery device and an electrical device incorporating this battery device. The battery device can improve the adhesion stability between the flexible heat exchanger and the battery cell, reduce the risk of delamination or peeling of the flexible film from the battery cell, reduce the risk of displacement of the flexible heat exchanger, improve the reliability of long-term stable heat dissipation of the flexible heat exchanger for the battery cell assembly, and also improve the heat dissipation capacity of the area where the battery cell assembly terminals are located, thereby improving the fast-charging heat dissipation performance and overall operational reliability of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, comprising: a housing; a battery cell assembly disposed within the housing and comprising a plurality of battery cells sequentially stacked along a first direction; and a flexible heat exchanger disposed within the housing, the flexible heat exchanger comprising: a flexible membrane and a supporting frame, the supporting frame being connected to and supporting the flexible membrane, the flexible heat exchanger having a heat exchange channel formed therein for containing a heat exchange medium, the flexible heat exchanger exchanging heat with the battery cell assembly through the flexible membrane, the electrode of the battery cell being arranged on at least one side of the battery cell assembly in a second direction, the flexible heat exchanger and the electrode being arranged on the same side of the battery cell assembly in the second direction, the first direction intersecting the second direction.

[0005] In the above technical solution, the flexible heat exchanger includes a flexible membrane and a supporting frame. The flexible membrane achieves flexible bonding with the battery cell, which helps reduce the contact thermal resistance between the flexible heat exchanger and the battery cell, improving heat exchange efficiency. The supporting frame enhances the structural strength of the flexible heat exchanger, which helps improve the bonding stability between the flexible heat exchanger and the battery cell, reduces the risk of delamination or peeling of the flexible membrane from the battery cell, reduces the risk of displacement of the flexible heat exchanger, and improves the reliability of the flexible heat exchanger for long-term stable heat dissipation of the battery cell assembly. By placing the flexible heat exchanger and the battery cell assembly's terminals on the same side, the distance between the terminals and the flexible heat exchanger is shortened, achieving close bonding heat exchange between the flexible heat exchanger and the side where the battery cell assembly's terminals are located. This shortens the heat exchange path, improves the heat dissipation capacity of the area where the battery cell assembly's terminals are located, reduces the local maximum temperature in the terminal area under fast charging conditions, reduces the risk of thermal runaway, and improves the fast charging heat dissipation performance and overall operational reliability of the battery device.

[0006] In some embodiments, the flexible heat exchanger is disposed on one side of the plurality of poles of the battery cell assembly in a third direction, wherein the first direction, the second direction, and the third direction intersect each other but are not coplanar.

[0007] In the above technical solution, by arranging the flexible heat exchanger on the side of the electrode in the third direction, not only is targeted heat dissipation of the side of the battery cell module where the electrode is located achieved, but it also helps to reduce the risk of interference between the flexible heat exchanger and the electrical connection piece connecting the electrode. Furthermore, it enables effective utilization of the space on the side of the battery cell module where the electrode is located in the third direction, reduces the space occupied by the flexible heat exchanger on both sides of the battery cell module in the second direction, and makes the structure of the battery device more compact.

[0008] In some embodiments, the flexible membrane includes a metal layer and an anti-corrosion layer stacked in the thickness direction of the flexible membrane, wherein the anti-corrosion layer is disposed on the side of the metal layer facing the heat exchange channel.

[0009] In the above technical solution, since the flexible membrane includes a metal layer and an anti-corrosion layer, the metal layer not only helps to improve the heat transfer efficiency and the heat exchange efficiency between the flexible heat exchanger and the battery cell, but also helps to improve the pressure resistance and sealing performance of the flexible membrane and extend the service life of the flexible heat exchanger; the anti-corrosion layer achieves effective isolation between the heat exchange medium and the metal layer, reduces the risk of corrosion of the metal layer, and extends the service life of the flexible membrane.

[0010] In some embodiments, the metal layer is an aluminum material layer, and / or the anti-corrosion layer is a polypropylene material layer.

[0011] In the above technical solution, setting the metal layer as an aluminum material layer helps to reduce the weight of the metal layer and facilitates the forming of the flexible membrane. Setting the anti-corrosion layer as a polypropylene material layer helps to improve the corrosion resistance of the anti-corrosion layer, extend the service life of the flexible membrane, and also helps to reduce costs.

[0012] In some embodiments, the flexible membrane further includes a wear-resistant layer disposed on the side of the metal layer opposite to the anti-corrosion layer.

[0013] In the above technical solution, by setting the flexible membrane to include a wear-resistant layer, it is beneficial to enhance the wear resistance of the flexible membrane, reduce the risk of the flexible membrane being scratched or punctured by surrounding parts, and improve the service life of the flexible membrane.

[0014] In some embodiments, the wear-resistant layer is a nylon material layer.

[0015] In the above technical solution, by setting the wear-resistant layer as a nylon material layer, it is beneficial to improve the wear resistance of the flexible membrane and reduce the cost.

[0016] In some embodiments, the support frame is disposed inside the flexible membrane, or the support frame is fixed to the outer surface of the flexible membrane.

[0017] In the above technical solution, placing the support frame inside the flexible membrane helps improve the integration of the flexible heat exchanger, enhances its overall integrity, improves its vibration resistance, reduces the risk of misalignment and separation between the flexible heat exchanger and the battery cell's contact surface, and improves heat exchange stability. Fixing the support frame to the outer surface of the flexible membrane reduces the assembly difficulty between the flexible membrane and the support frame, facilitates maintenance and replacement, and also helps reduce the risk of leakage from the flexible membrane.

[0018] In some embodiments, the support frame includes: crossbars and connecting rods, wherein there are two crossbars, the two crossbars extend along a first direction and are spaced apart in a third direction, the third direction intersecting the first direction, and there are two connecting rods respectively arranged on both sides of the crossbars in the first direction and connected between the two crossbars.

[0019] In the above technical solution, the support frame includes two crossbars and two connecting rods, which allows the support frame to be formed into a quadrilateral frame structure. This simplifies the structure of the support frame, facilitates its molding, and improves its structural stability, thereby enhancing the support stability for the flexible membrane and improving the assembly position accuracy between the flexible heat exchanger and the battery cell assembly. Furthermore, the frame structure of the support frame allows the flexible membrane to retain its autonomous deformation capability while supporting it, facilitating a tight fit between the flexible membrane and the surface of the battery cell.

[0020] In some embodiments, the support frame further includes: a central rod extending along the first direction and arranged between the two crossbars, the two ends of the central rod being connected to the two connecting rods respectively.

[0021] In the above technical solution, by setting an intermediate rod and placing it between two crossbars with two connecting rods at each end, the intermediate rod provides support for the middle position of the flexible membrane, reducing the risk of bulging in the middle position of the flexible membrane. At the same time, the intermediate rod also helps to further enhance the overall structural strength of the support frame, making the overall stress on the flexible membrane more uniform and reducing the risk of stress concentration.

[0022] In some embodiments, the support frame is fixed to the outer surface of the flexible membrane, the intermediate rod includes two rods, both of which extend along the first direction and are spaced apart and arranged opposite to each other in the second direction, the flexible membrane is sandwiched between the two rods of the intermediate rod, and the first direction, the second direction and the third direction intersect each other and are not coplanar.

[0023] In the above technical solution, by arranging the two rods of the intermediate rod on opposite sides of the flexible membrane and clamping the flexible membrane, it is beneficial to improve the connection reliability between the intermediate rod and the flexible membrane, increase the support stiffness of the middle position of the flexible membrane, reduce the risk of warping or displacement of the middle position of the flexible membrane, and make the assembly simple and convenient, and easy to maintain and replace.

[0024] In some embodiments, the heat exchange channel of the flexible heat exchanger includes a plurality of branch channels, which extend along the first direction and are spaced apart in the third direction, and the plurality of branch channels are connected in series and / or in parallel.

[0025] In the above technical solution, by making the heat exchange channel of the flexible heat exchanger include multiple branch channels connected in parallel and / or in series, it is beneficial to increase the heat exchange contact area between the heat exchange medium and the flexible heat exchanger, and also beneficial to make the heat exchange medium uniformly distributed in the flexible heat exchanger, thereby improving the temperature uniformity of the battery cell.

[0026] In some embodiments, the flexible heat exchanger further includes: an inlet connector and an outlet connector, the inlet connector and the outlet connector being disposed on one of the connecting rods and communicating with the heat exchange channel, the number of branch channels being two, a connecting channel being formed at the end of the support frame away from the inlet connector and the outlet connector, and the ends of the two branch channels opposite to the inlet connector and the outlet connector being communicated through the connecting channel.

[0027] In the above technical solution, the heat exchange channels within the flexible heat exchanger extend into a U-shape, which helps to make the flow distribution of the heat exchange medium within the flexible heat exchanger more uniform, reduce flow resistance, achieve uniform heat dissipation on the surface of the battery cell assembly, and improve the temperature uniformity within the battery device. By forming the connecting channels on the supporting frame, the structure of the heat exchange channels within the flexible membrane is simplified, facilitating flexible membrane molding and reducing the risk of flexible membrane leakage.

[0028] In some embodiments, the support frame is fixed to the outer surface of the flexible membrane, and the connecting channel is formed in another connecting rod arranged away from the inlet and outlet connectors; or, the support frame is located on the inner side of the flexible membrane, and the connecting channel is formed at one end of the intermediate rod away from the inlet and outlet connectors.

[0029] In the above technical solution, by forming the connecting channel at one end of the connecting rod or intermediate rod away from the liquid inlet and liquid outlet, it is beneficial to extend the effective length of the branch channel, reduce the flow dead zone in the heat exchange channel, and improve the heat exchange efficiency.

[0030] In some embodiments, the number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged sequentially along a second direction, the first direction intersecting the second direction, and the number of flexible heat exchangers is multiple and disposed between two adjacent battery cell assemblies and / or disposed on at least one side of the multiple battery cell assemblies in the second direction.

[0031] In the above technical solution, by arranging the flexible heat exchanger between adjacent battery cell modules, the flexible heat exchanger and the battery cell modules on both sides can be cooled synchronously, thereby improving the heat exchange efficiency. When the electrode is arranged on one or both sides of the battery cell in the second direction, it is also beneficial to reduce the risk of local overheating at the electrode location and improve the temperature uniformity within the battery device.

[0032] In some embodiments, the battery device further includes: a first cold plate disposed within the housing and arranged on one side of the plurality of battery cell assemblies in a third direction, for heat exchange with the plurality of battery cell assemblies, wherein the first direction, the second direction, and the third direction intersect each other and are not coplanar.

[0033] In the above technical solution, by setting a first cold plate and arranging it on one side of the multiple battery cell modules in the third direction, the first cold plate realizes heat exchange between the multiple battery cell modules on the side of the multiple battery cell modules in the third direction. At the same time, the flexible heat exchange component exchanges heat between the battery cell modules on one or both sides in the second direction. Thus, the flexible heat exchange component and the first cold plate constitute a composite thermal management system, which improves the heat exchange efficiency of the multiple battery cell modules, reduces the temperature difference between the battery cell modules, and improves the temperature uniformity within the battery device.

[0034] In some embodiments, the enclosure includes a main body and a cover, the main body defining a top-open receiving cavity, the battery cell assembly being disposed within the receiving cavity, the cover sealing the top of the main body, and the first cold plate being disposed between the cover and the battery cell assembly.

[0035] In the above technical solution, by placing the first cold plate between the cover and multiple battery cell modules, the first cold plate not only achieves heat dissipation from the top of the multiple battery cell modules, but also makes full use of the top space inside the box, thereby improving the space utilization rate of the battery device.

[0036] In some embodiments, the battery device further includes a second cold plate disposed within the housing and arranged on the opposite side of the plurality of battery cell assemblies in the third direction, for heat exchange with the plurality of battery cell assemblies.

[0037] In the above technical solution, the first cold plate and the second cold plate are respectively arranged on both sides of the multiple battery cell modules in the third direction, and the flexible heat exchanger is arranged on at least one side of the battery cell module in the second direction. The first cold plate, the second cold plate and the multiple flexible heat exchangers constitute a composite heat dissipation system for heat dissipation at the top, bottom and middle of the multiple battery cell modules, thereby improving the thermal management efficiency of the battery device and improving the temperature uniformity within the battery device.

[0038] In some embodiments, the battery cell is provided with a pressure relief structure, the pressure relief structure is arranged on the side of the battery cell facing the second cold plate in the third direction, and a plurality of pressure relief channels are formed in the housing corresponding to a plurality of battery cell assemblies. The pressure relief channels are opposite to and connected to the pressure relief structures of the plurality of battery cells in the corresponding battery cell assembly in the third direction.

[0039] In the above technical solution, by aligning the pressure relief structure of the battery cell towards the second cold plate, and with the pressure relief channel directly opposite and connected to the pressure relief structure, when thermal runaway occurs in the battery cell, the high-temperature gas released through the pressure relief structure can be discharged from the battery device along the pressure relief channel, reducing the risk of thermal runaway propagation. Furthermore, since the second cold plate is located on the same side as the pressure relief channel, it can initially cool the ejected high-temperature medium, further reducing the risk of thermal runaway.

[0040] In some embodiments, there are multiple second cold plates, which are spaced apart along the second direction. Along the second direction, the pressure relief structure and the pressure relief channel are arranged between two adjacent second cold plates. Alternatively, the second cold plate includes a heat exchange plate portion and a connecting plate portion. There are multiple heat exchange plate portions, which extend along the first direction and are spaced apart along the second direction. A medium channel for containing heat exchange medium is formed in the heat exchange plate portion. The connecting plate portion is connected between two adjacent heat exchange plate portions. A plurality of through holes are formed on the connecting plate portion along the third direction. The plurality of through holes correspond one-to-one with the pressure relief structure of a plurality of battery cells in the battery cell assembly. The pressure relief structure communicates with the pressure relief channel through the corresponding through hole.

[0041] In the above technical solution, by arranging multiple second cold plates at intervals along a second direction, and placing the pressure relief structure and pressure relief channel between adjacent second cold plates, a partitioned arrangement of the second cold plates and the pressure relief channel is achieved. This reduces the risk of the second cold plates obstructing the pressure relief structure while meeting the bottom heat dissipation requirements of the battery cell assembly, facilitating the smooth discharge of high-temperature media during thermal runaway. The second cold plate comprises a heat exchange plate portion and a connecting plate portion. The heat exchange plate portion is used to adhere to the battery cell assembly for efficient heat exchange, while the connecting plate portion has through holes corresponding to the pressure relief structure. In the event of thermal runaway, the high-temperature media can flow through the through holes to the pressure relief channel, facilitating the smooth discharge of the high-temperature media during thermal runaway. Furthermore, the connecting plate portion connects adjacent heat exchange plate portions, making the second cold plate a single integral structure, which helps reduce the number of components and improve assembly efficiency.

[0042] Secondly, embodiments of this application provide an electrical device, including a battery device according to the first aspect of this application.

[0043] In the above embodiments, by providing the battery device described in the first aspect, the overall performance of the power-consuming device is improved.

[0044] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of this application; Figure 2 This is an exploded view of a battery device according to an embodiment of this application; Figure 3 This is an exploded view of the battery cell assembly and flexible heat exchanger of the battery device according to an embodiment of this application. Figure 4 yes Figure 3 A schematic diagram of the flexible heat exchanger shown; Figure 5 yes Figure 4 An exploded view of the flexible heat exchanger shown. Figure 6 This is a schematic diagram of the structure of a flexible heat exchanger in a battery device according to other embodiments of this application; Figure 7 yes Figure 6 The exploded view of the flexible heat exchanger shown.

[0046] Figure label: 1. Electrical appliances; 100. Battery assembly; 200. Controller; 300. Motor; 10. Box body; 20. Battery cell assembly; 21. Battery cell; 211. Terminal post; 30. Flexible heat exchange components; 31. Flexible membrane; 32. Supporting framework; 321. Crossbar; 322. Connecting rod; 323. Intermediate rod; 3231. Rod body; 33. Liquid inlet connector; 34. Liquid outlet connector; 40. First cold plate; 50. Second cold plate; 51. Heat exchange plate section; 52. Connecting plate section; 521. Through hole; 60. First manifold; 70. Second manifold. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0053] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0055] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0056] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0057] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0058] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0059] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0060] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0061] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0062] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0063] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0064] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0065] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0066] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0067] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0068] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0069] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0070] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0071] Battery devices continuously generate a large amount of heat during charging and discharging. This heat accumulation leads to uneven temperature distribution among battery cells, accelerating cell aging and, in extreme cases, even inducing thermal runaway. In related technologies, flexible cold plates are used for heat exchange with the battery cells to achieve heat dissipation. However, these flexible cold plates often rely on single-sided thermally conductive adhesive to be fully bonded to the sidewalls of the battery cells. Due to the flexible material used, the bonding stability between the cold plate and the battery cells is poor. When the flexible cold plate is pressurized by the heat exchange medium, it is prone to localized bulging and warping deformation, causing large areas of separation between the cold plate and the sidewalls of the battery cells, forming air gaps. This significantly increases contact thermal resistance and drastically reduces heat dissipation efficiency. Furthermore, during vehicle operation, the constant bumps and vibrations can cause the thermally conductive adhesive to peel off under continuous load, leading to displacement of the flexible cold plate and ultimately causing the heat dissipation structure to fail, failing to meet the long-term stable heat dissipation requirements of the battery device.

[0072] Based on the above considerations, in order to improve the bonding stability between the flexible heat exchanger and the battery cell, this application designs a battery device. The battery device includes a battery cell assembly and a flexible heat exchanger. The flexible heat exchanger includes a flexible membrane and a supporting frame supporting the flexible membrane. The flexible membrane enables flexible bonding between the flexible heat exchanger and the battery cell, which helps to reduce the contact thermal resistance between the flexible heat exchanger and the battery cell and improve the heat exchange efficiency. The supporting frame improves the structural strength of the flexible heat exchanger, which helps to improve the bonding stability between the flexible heat exchanger and the battery cell, reduces the risk of delamination or peeling of the flexible membrane from the battery cell, reduces the risk of displacement of the flexible heat exchanger, and improves the reliability of the flexible heat exchanger for long-term stable heat dissipation of the battery cell assembly.

[0073] This application provides an electrical device that uses the battery device disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0074] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1 and the battery device 100 of this application in detail.

[0075] Please refer to Figure 1 , Figure 1The electrical device 1 provided in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 100, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to supply power to the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0076] Please refer to Figure 2 , Figure 2 The following is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 21. The housing 10 provides assembly space for the battery cells 21, and the battery cells 21 are housed within the housing 10.

[0077] The following is for reference. Figures 2-7 A battery device 100 according to an embodiment of the first aspect of this application is described.

[0078] like Figures 2-3 As shown, this application provides a battery device 100, including: a housing 10, a battery cell assembly 20, and a flexible heat exchanger 30. The battery cell assembly 20 is disposed within the housing 10 and includes components along a first direction (e.g., Figure 2 Multiple battery cells 21 arranged in sequence in the F1 direction shown in the figure; as Figure 4 and Figure 5 As shown, the flexible heat exchanger 30 is disposed within the housing 10. The flexible heat exchanger 30 includes a flexible membrane 31 and a supporting frame 32. The supporting frame 32 is connected to and supports the flexible membrane 31. A heat exchange channel for containing the heat exchange medium is formed within the flexible heat exchanger 30. The flexible heat exchanger 30 exchanges heat with the battery cell assembly 20 through the flexible membrane 31. The electrode post 211 of the battery cell 21 is arranged in the battery cell assembly 20 in a second direction (e.g., Figure 3 At least one side of the F2 direction shown in the diagram, the flexible heat exchanger 30 and the pole post 211 are arranged on the same side of the battery cell assembly 20 in the second direction, where the first direction intersects the second direction.

[0079] In some examples, the enclosure 10 includes a main body and a lid. The main body defines a top-open receiving cavity, and the lid covers the top of the main body. The main body may include side beams and a bottom plate. The side beams extend into a rectangular frame shape, the bottom plate covers the bottom of the side beams, and the lid covers the top of the side beams. In some examples, the enclosure 10 may also contain multiple structural beams along a second direction (e.g., Figure 2 As shown in the F2 direction, the battery cell assembly 20 extends and is arranged in parallel intervals in the first direction. The battery cell assembly 20 is disposed between adjacent structural beams, which are used to limit the expansion of the battery cell 21.

[0080] In some examples, the number of battery cell assembly 20 can be one or more. Multiple battery cell assembly 20 can be arranged along a second direction, or multiple battery cell assembly 20 can be arranged sequentially along a first direction and a second direction. In some examples, each battery cell assembly 20 may include five, ten, sixteen, twenty, twenty-four, thirty-two, forty, or fifty or more battery cells 21 stacked together.

[0081] In some examples, the flexible membrane 31 of the flexible heat exchanger 30 is a flexible thin film material. The heat exchange channel of the flexible heat exchanger 30 can be defined by the flexible membrane 31 alone, or it can be defined by the flexible membrane 31 and the support frame 32 together.

[0082] In some examples, the support frame 32 can be arranged inside the flexible membrane 31, outside the flexible membrane 31, or partly inside the flexible membrane 31 and partly outside the flexible membrane 31.

[0083] In this embodiment, the support frame 32 is used to support the flexible membrane 31, thereby improving the overall structural strength of the flexible heat exchanger 30, enhancing the bonding stability between the flexible membrane 31 and the battery cell 21, reducing the risk of delamination or peeling between the flexible membrane 31 and the battery cell 21, reducing the risk of displacement of the flexible heat exchanger 30, and improving the reliability of the flexible heat exchanger 30 in providing long-term stable heat dissipation to the battery cell assembly 20.

[0084] In some examples, the terminals 211 of the battery cell 21 include a positive terminal and a negative terminal. The positive and negative terminals can be arranged on the same side of the battery cell assembly 20 in the second direction, or they can be arranged on opposite sides of the battery cell assembly 20 in the second direction. When the positive and negative terminals are arranged on the same side, the flexible heat exchanger 30 is arranged on the same side as the positive and negative terminals. When the positive and negative terminals are arranged on opposite sides, the flexible heat exchanger 30 can be arranged only on the side where the positive terminal is located, or only on the side where the negative terminal is located, or the flexible heat exchanger 30 can be arranged on both opposite sides where the positive and negative terminals are located.

[0085] It should be noted that under the fast charging condition of battery cell 21, the Joule heat and contact heat of battery cell 21 are concentrated in the terminal post 211 and the structural area connected to the terminal post 211. This can easily lead to problems such as local overheating of the terminal post 211, excessive temperature difference of battery cell 21, and excessive temperature rise during fast charging, which seriously affects the cycle life, fast charging capability and reliability of battery device 100.

[0086] In the above technical solution, since the flexible heat exchanger 30 includes a flexible membrane 31 and a support frame 32, the flexible membrane 31 achieves flexible bonding with the battery cell 21, which helps to reduce the contact thermal resistance between the flexible heat exchanger 30 and the battery cell 21 and improve the heat exchange efficiency. The support frame 32 improves the structural strength of the flexible heat exchanger 30, which helps to improve the bonding stability between the flexible heat exchanger 30 and the battery cell 21, reduces the risk of delamination or peeling of the flexible membrane 31 and the battery cell 21, reduces the risk of displacement of the flexible heat exchanger 30, and improves the reliability of the flexible heat exchanger 30 in providing long-term stable heat dissipation to the battery cell assembly 20. By placing the flexible heat exchanger 30 and the terminal post 211 of the battery cell assembly 20 on the same side, it is beneficial to shorten the distance between the terminal post 211 and the flexible heat exchanger 30, achieve close contact heat exchange between the flexible heat exchanger 30 and the side where the terminal post 211 of the battery cell assembly 20 is located, shorten the heat exchange path, improve the heat dissipation capacity of the area where the terminal post 211 of the battery cell assembly 20 is located, reduce the local maximum temperature in the area of ​​the terminal post 211 under fast charging conditions, reduce the risk of thermal runaway, and improve the fast charging heat dissipation performance and overall operational reliability of the battery device 100.

[0087] In some embodiments of this application, such as Figures 2-3 As shown, the flexible heat exchanger 30 is disposed in a third direction (e.g., on the multiple poles 211 of the battery cell assembly 20). Figure 3 On one side of the F3 direction shown, the first direction, the second direction, and the third direction intersect each other but are not coplanar.

[0088] In other words, the flexible heat exchanger 30 and the terminals 211 of the multiple battery cells 21 of the battery cell assembly 20 are arranged side by side in a third direction. For example, the third direction is the vertical direction of the battery device 100, and the terminals 211 of the battery cells 21 are arranged on opposite sides of the battery cell assembly 20 in a second direction, with the terminals 211 positioned close to the upper surface of the battery cells 21, and the flexible heat exchanger 30 positioned below the terminals 211. In this way, the flexible heat exchanger 30 can fit against the surface of the casing on the side where the terminals 211 of the battery cells 21 are located, thereby achieving heat dissipation in the area where the terminals 211 are located.

[0089] In the above technical solution, by arranging the flexible heat exchanger 30 on the side of the electrode post 211 in the third direction, not only is targeted heat dissipation achieved on the side of the battery cell assembly 20 where the electrode post 211 is located, but it also helps to reduce the risk of interference between the flexible heat exchanger 30 and the electrical connection piece connecting the electrode post 211. Furthermore, it enables effective utilization of the space on the side of the battery cell assembly 20 where the electrode post 211 is located in the third direction, reduces the space occupied by the flexible heat exchanger 30 on both sides of the battery cell assembly 20 in the second direction, and makes the structure of the battery device 100 more compact.

[0090] In some embodiments of this application, the flexible membrane 31 includes a metal layer and an anti-corrosion layer stacked in the thickness direction of the flexible membrane 31, with the anti-corrosion layer disposed on the side of the metal layer facing the heat exchange channel.

[0091] In some examples, the metal layer can be an aluminum layer, an aluminum alloy layer, a copper layer, a copper alloy layer, a titanium layer, and / or a titanium alloy layer. Thus, the metal layer can serve as a sealing and insulating layer and a core sealing and pressure-bearing layer for the flexible membrane 31, improving the integrity and sealing performance of the heat exchange channel structure, enabling it to withstand the circulating pressure of the heat exchange medium, and reducing the risk of leakage and water seepage.

[0092] In some examples, the anti-corrosion layer can be a polypropylene layer, a polyethylene layer, a polytetrafluoroethylene layer, an epoxy resin layer, and / or a polyurethane layer. The anti-corrosion layer is used to directly contact the heat exchange medium in the heat exchange channel, and is designed to withstand long-term corrosion and moisture oxidation from the ethylene glycol heat exchange medium, reducing the risk of corrosion perforation failure of the flexible membrane 31.

[0093] In the above technical solution, since the flexible membrane 31 includes a metal layer and an anti-corrosion layer, the metal layer not only helps to improve the heat transfer efficiency and the heat exchange efficiency between the flexible heat exchanger 30 and the battery cell 21, but also helps to improve the pressure resistance and sealing performance of the flexible membrane 31 and extend the service life of the flexible heat exchanger 30; the anti-corrosion layer achieves effective isolation between the heat exchange medium and the metal layer, reduces the risk of corrosion of the metal layer, and extends the service life of the flexible membrane 31.

[0094] In some embodiments of this application, the metal layer is an aluminum material layer, and / or the anti-corrosion layer is a polypropylene material layer.

[0095] In the above technical solution, by setting the metal layer as an aluminum material layer, it is beneficial to reduce the weight of the metal layer and facilitate the forming of the flexible membrane 31. Setting the anti-corrosion layer as a polypropylene material layer is beneficial to improve the corrosion resistance of the anti-corrosion layer, extend the service life of the flexible membrane 31, and also help to reduce costs.

[0096] In some embodiments of this application, the flexible membrane 31 further includes a wear-resistant layer disposed on the side of the metal layer away from the anti-corrosion layer.

[0097] In some examples, the wear-resistant layer can be a nylon layer, a polypropylene layer, a polyethylene layer, a polytetrafluoroethylene layer, and / or a polyimide layer. Thus, the wear-resistant layer can possess high strength, wear resistance, and puncture resistance, effectively resisting frictional wear during the assembly of the battery cell assembly 20, as well as puncture and compression damage to the edges and corners of the battery cell 21 and the rigid structure of the wiring harness.

[0098] In the above technical solution, by setting the flexible membrane 31 to include a wear-resistant layer, it is beneficial to enhance the wear resistance of the flexible membrane 31, reduce the risk of the flexible membrane 31 being scratched and punctured by surrounding parts, and improve the service life of the flexible membrane 31.

[0099] In some embodiments of this application, the wear-resistant layer is a nylon material layer.

[0100] In the above technical solution, by setting the wear-resistant layer as a nylon material layer, it is beneficial to improve the wear resistance of the flexible membrane 31 and reduce the cost.

[0101] In some embodiments of this application, the support frame 32 is disposed inside the flexible membrane 31, or the support frame 32 is fixed to the outer surface of the flexible membrane 31.

[0102] In some examples, the support frame 32 is connected as a single structure, and the flexible membrane 31 includes a first half membrane and a second half membrane. The first half membrane and the second half membrane are respectively disposed on opposite sides of the support frame 32 in the second direction. During the forming process of the flexible heat exchanger 30, the first half membrane and the second half membrane cooperate to wrap and clamp the support frame 32 inside. At this time, the flexible membrane 31 and the support frame 32 together define the heat exchange channel.

[0103] In some examples, the flexible membrane 31 defines the heat exchange channels, and the support frame 32 is disposed on the outer surface of the flexible membrane 31. In a projection plane perpendicular to the second direction, the support frame 32 is spaced apart from the heat exchange channels in the flexible membrane 31.

[0104] In the above technical solution, by placing the support frame 32 inside the flexible membrane 31, it is beneficial to improve the integration of the flexible heat exchanger 30, enhance the overall integrity of the flexible heat exchanger 30, improve the vibration resistance of the flexible heat exchanger 30, reduce the risk of misalignment and separation between the flexible heat exchanger 30 and the bonding surface of the battery cell 21, and improve heat exchange stability. Fixing the support frame 32 to the outer surface of the flexible membrane 31 helps to reduce the assembly difficulty between the flexible membrane 31 and the support frame 32, facilitates maintenance and replacement, and also helps to reduce the risk of leakage of the flexible membrane 31.

[0105] In some embodiments of this application, such as Figures 4-7 As shown, the support frame 32 includes: crossbars 321 and connecting rods 322. There are two crossbars 321, which extend along a first direction and are spaced apart in a third direction. The third direction intersects with the first direction. There are two connecting rods 322, which are respectively arranged on both sides of the crossbars 321 in the first direction and connect the two crossbars 321.

[0106] In some examples, the two crossbars 321 and the two connecting rods 322 can form a rectangular support frame 32, or they can form a grid-shaped support frame 32.

[0107] In this embodiment, the support frame 32 is formed into a frame structure, which realizes the overall deformation of the flexible membrane 31 without wrapping or restricting it, so that the flexible heat exchanger 30 has the ability to autonomously deform slightly to fit the surface of the battery cell 21. Specifically, when the battery cell assembly 20 is assembled and the heat exchange medium is introduced, the pressurized heat exchange medium fills the heat exchange channel, and the flexible membrane 31 can adaptively undergo slight deformation according to the side structure of the battery cell 21, actively eliminating the assembly gap between the flexible heat exchanger 30 and the side wall of the battery cell 21, and realizing the tight fit between the plate surface of the flexible heat exchanger 30 and the side of the battery cell 21 (e.g., the heat dissipation area of ​​the pole post 211).

[0108] In the above technical solution, the support frame 32 includes two crossbars 321 and two connecting rods 322, which allows the support frame 32 to be formed into a quadrilateral frame structure. This simplifies the structure of the support frame 32, facilitates its forming, and improves its structural stability, thereby enhancing the support stability of the flexible membrane 31 and improving the assembly position accuracy between the flexible heat exchanger 30 and the battery cell assembly 20. Furthermore, the frame structure of the support frame 32 allows the flexible membrane 31 to retain its autonomous deformation capability while supporting it, facilitating a tight fit between the flexible membrane 31 and the surface of the battery cell 21.

[0109] In some embodiments of this application, such as Figure 5 and Figure 7As shown, the support frame 32 also includes: a middle rod 323, which extends along the first direction and is arranged between two crossbars 321, and the two ends of the middle rod 323 are respectively connected to two connecting rods 322.

[0110] In some examples, there can be one intermediate rod 323 or multiple intermediate rods 323. When there are multiple intermediate rods 323, they can be arranged at intervals in the third direction.

[0111] In the above technical solution, by setting an intermediate rod 323 and arranging it between two crossbars 321 with two connecting rods 322 at each end, the intermediate rod 323 provides support for the middle position of the flexible membrane 31, reducing the risk of bulging of the flexible membrane 31 in the middle position. At the same time, the intermediate rod 323 also helps to further enhance the overall structural strength of the support frame 32, and helps to make the overall stress of the flexible membrane 31 more uniform, reducing the risk of stress concentration.

[0112] In some embodiments of this application, such as Figure 5 As shown, the support frame 32 is fixed to the outer surface of the flexible membrane 31. The intermediate rod 323 includes two rods 3231. Both rods 3231 extend along the first direction and are spaced apart and arranged opposite each other in the second direction. The flexible membrane 31 is sandwiched between the two rods 3231 of the intermediate rod 323. The first direction, the second direction and the third direction intersect each other and are not coplanar.

[0113] In the above technical solution, by arranging the two rods 3231 of the intermediate rod 323 on opposite sides of the flexible membrane 31 and clamping the flexible membrane 31, it is beneficial to improve the connection reliability between the intermediate rod 323 and the flexible membrane 31, improve the support stiffness of the middle position of the flexible membrane 31, reduce the risk of warping or displacement of the middle position of the flexible membrane 31, and make the assembly simple and convenient, and easy to maintain and replace.

[0114] In some embodiments of this application, such as Figure 5 As shown, the heat exchange channel of the flexible heat exchanger 30 includes multiple branch channels, which extend along a first direction and are spaced apart in a third direction. The multiple branch channels are connected in series and / or in parallel.

[0115] For example, the heat exchange channels of the flexible heat exchanger 30 may include two, three, four, five or more branch channels, and multiple branch channels may be connected in series or in parallel.

[0116] In the above technical solution, by making the heat exchange channel of the flexible heat exchanger 30 include multiple branch channels connected in parallel and / or in series, it is beneficial to increase the heat exchange contact area between the heat exchange medium and the flexible heat exchanger 30, and also beneficial to make the heat exchange medium uniformly distributed in the flexible heat exchanger 30, thereby improving the temperature uniformity of the battery cell 21.

[0117] In some embodiments of this application, such as Figures 4-7 As shown, the flexible heat exchanger 30 also includes: an inlet connector 33 and an outlet connector 34. The inlet connector 33 and the outlet connector 34 are mounted on one of the connecting rods 322 and communicate with the heat exchange channel. There are two branch channels. The end of the support frame 32 away from the inlet connector 33 and the outlet connector 34 forms a connecting channel. The ends of the two branch channels away from the inlet connector 33 and the outlet connector 34 are connected through the connecting channel.

[0118] In some examples, the two connecting rods 322 of the supporting frame 32 are the mounting rod and the adapter rod, respectively. The liquid inlet connector 33 and the liquid outlet connector 34 are both provided on the mounting rod and arranged at intervals in the third direction. The connecting flow channel can be formed on the adapter rod or on the intermediate rod 323.

[0119] In this embodiment, the heat exchange channel includes two branch channels, which extend along a first direction and are arranged in a third direction. One end of each branch channel in the first direction is connected to the inlet connector 33 and the outlet connector 34, respectively, and the other end of each branch channel in the first direction is connected through a connecting channel. Thus, the heat exchange channel as a whole has a U-shaped form. This makes the flow distribution of the heat exchange medium within the flexible heat exchanger 30 more uniform, reduces flow resistance, achieves uniform heat dissipation on the surface of the battery cell assembly 20, and improves the temperature uniformity within the battery device 100.

[0120] In the above technical solution, the heat exchange channels within the flexible heat exchanger 30 extend into a U-shape, which helps to make the heat exchange medium flow distribution within the flexible heat exchanger 30 more uniform, reduce flow resistance, achieve uniform heat dissipation on the surface of the battery cell assembly 20, and improve the temperature uniformity within the battery device 100. By forming the connecting channels on the support frame 32, the structure of the heat exchange channels within the flexible membrane 31 is simplified, facilitating the molding of the flexible membrane 31 and reducing the risk of leakage of the flexible membrane 31.

[0121] In some embodiments of this application, such as Figure 5 As shown, the support frame 32 is fixed to the outer surface of the flexible membrane 31, and the connecting channel is formed within another connecting rod 322 located away from the inlet connector 33 and the outlet connector 34; or, as Figure 7 As shown, the support frame 32 is located inside the flexible membrane 31, and the connecting channel is formed at the end of the intermediate rod 323 away from the liquid inlet connector 33 and the liquid outlet connector 34.

[0122] In the above technical solution, by forming the connecting channel at one end of the connecting rod 322 or intermediate rod 323 away from the liquid inlet connector 33 and the liquid outlet connector 34, it is beneficial to extend the effective length of the branch channel, reduce the flow dead zone in the heat exchange channel, and improve the heat exchange efficiency.

[0123] In some embodiments of this application, such as Figure 2 and Figure 3 As shown, there are multiple battery cell assemblies 20 arranged sequentially along the second direction, with the first direction intersecting the second direction. There are multiple flexible heat exchange elements 30 disposed between two adjacent battery cell assemblies 20 and / or disposed on at least one side of the multiple battery cell assemblies 20 in the second direction.

[0124] In some examples, the number of flexible heat exchangers 30 can be two, three, four, five, six or more, with one flexible heat exchanger 30 between each pair of adjacent battery cell assemblies 20, or one battery cell assembly 20 between each pair of adjacent flexible heat exchangers 30.

[0125] In the above technical solution, by arranging the flexible heat exchanger 30 between adjacent battery cell modules 20, the flexible heat exchanger 30 and the battery cell modules 20 on both sides are simultaneously cooled, thereby improving the heat exchange efficiency. When the electrode post 211 is arranged on one or both sides of the battery cell 21 in the second direction, it is also beneficial to reduce the risk of local overheating at the electrode post 211 position and improve the temperature uniformity within the battery device 100.

[0126] In some examples, such as Figure 2 As shown, the battery device 100 further includes: a first manifold 60 and a second manifold 70. The first manifold 60 and the second manifold 70 are arranged on one side of the plurality of battery cell assemblies 20 in a first direction. The first manifold 60 and the second manifold 70 both extend along a second direction and are spaced apart in a third direction. The liquid inlet connectors 33 of the plurality of flexible heat exchangers 30 are all connected to the first manifold 60, and the liquid outlet connectors 34 of the plurality of flexible heat exchangers 30 are all connected to the second manifold 70. The first manifold 60 is provided with a first connector for connecting to an external liquid inlet pipeline, and the second manifold 70 is provided with a second connector for connecting to an external liquid outlet pipeline. The heat exchange medium in the external liquid inlet pipeline enters the first manifold 60 through the first connector, enters the heat exchange channels of the plurality of flexible heat exchangers 30 in the first manifold 60, exchanges heat with the battery cell assemblies 20, and then enters the second manifold 70 through the liquid outlet connectors 34 of the plurality of flexible heat exchangers 30, and then flows out of the battery device 100 through the second connector.

[0127] In some embodiments of this application, such as Figure 2As shown, the battery device 100 further includes: a first cold plate 40, which is disposed inside the housing 10 and arranged on one side of the plurality of battery cell assemblies 20 in the third direction, for heat exchange with the plurality of battery cell assemblies 20, wherein the first direction, the second direction and the third direction intersect each other and are not coplanar.

[0128] In some examples, the first cold plate 40 is a plate shape set perpendicular to a third direction, and a first flow channel for containing heat exchange medium is formed in the first cold plate 40. In the projection plane perpendicular to the third direction, the projections of multiple battery cell components 20 are all located within the projection range of the first cold plate 40.

[0129] In the above technical solution, by setting a first cold plate 40 and arranging the first cold plate 40 on one side of the multiple battery cell modules in the third direction, the first cold plate 40 realizes heat exchange for the multiple battery cell modules 20 on one side of the multiple battery cell modules in the third direction. At the same time, the flexible heat exchanger 30 exchanges heat for the battery cell modules 20 on one or both sides in the second direction. Thus, the flexible heat exchanger 30 and the first cold plate 40 constitute a composite thermal management system, which improves the heat exchange efficiency of the multiple battery cell modules 20, reduces the temperature difference between the battery cell modules 20, and improves the temperature uniformity within the battery device 100.

[0130] In some embodiments of this application, such as Figure 2 As shown, the housing 10 includes a housing body and a housing cover. The housing body defines a top-open receiving cavity, in which the battery cell assembly 20 is disposed. The housing cover seals the top of the housing body, and a first cold plate 40 is disposed between the housing cover and the battery cell assembly 20.

[0131] In the above technical solution, by placing the first cold plate 40 between the cover and the multiple battery cell assembly 20, the first cold plate 40 not only achieves heat dissipation from the top of the multiple battery cell assembly 20, but also makes full use of the top space inside the housing 10, thereby improving the space utilization rate of the battery device 100.

[0132] In some embodiments of this application, such as Figure 2 As shown, the battery device 100 further includes a second cold plate 50, which is disposed inside the housing 10 and arranged on the other side of the plurality of battery cell assemblies 20 in the third direction, for heat exchange with the plurality of battery cell assemblies 20.

[0133] In the above technical solution, the first cold plate 40 and the second cold plate 50 are respectively arranged on both sides of the multiple battery cell modules 20 in the third direction, and the flexible heat exchanger 30 is arranged on at least one side of the battery cell module 20 in the second direction. The first cold plate 40, the second cold plate 50 and the multiple flexible heat exchangers 30 constitute a composite heat dissipation system for heat dissipation at the top, bottom and middle of the multiple battery cell modules 20, thereby improving the thermal management efficiency of the battery device 100 and improving the temperature uniformity within the battery device 100.

[0134] In some embodiments of this application, such as Figure 2 As shown, the battery cell 21 is provided with a pressure relief structure, which is arranged on the side of the battery cell 21 facing the second cold plate 50 in the third direction. Multiple pressure relief channels are formed inside the housing 10, which correspond one-to-one with the multiple battery cell assemblies 20. The pressure relief channels are opposite to and connected to the pressure relief structures of the multiple battery cells 21 of the corresponding battery cell assemblies 20 in the third direction.

[0135] In the above technical solution, by aligning the pressure relief structure of the battery cell 21 towards the second cold plate 50, and with the pressure relief channel directly opposite and connected to the pressure relief structure, when thermal runaway occurs in the battery cell 21, the high-temperature gas released through the pressure relief structure can be discharged from the battery device 100 along the pressure relief channel, reducing the risk of thermal runaway propagation. Furthermore, since the second cold plate 50 is positioned on the same side as the pressure relief channel, it can provide initial cooling to the ejected high-temperature medium, further reducing the risk of thermal runaway.

[0136] In some embodiments of this application, reference is made to Figure 2 As shown, there are multiple second cold plates 50, which are arranged at intervals along the second direction. Along the second direction, the pressure relief structure and pressure relief channel are arranged between two adjacent second cold plates 50.

[0137] In the above technical solution, by arranging multiple second cold plates 50 at intervals along the second direction, and setting the pressure relief structure and pressure relief channel between adjacent second cold plates 50, the partitioned arrangement of the second cold plates 50 and the pressure relief channel is realized. Thus, while meeting the bottom heat dissipation requirements of the battery cell assembly 20, the risk of the second cold plates 50 blocking the pressure relief structure is reduced, and the high temperature medium is facilitated to be discharged smoothly during thermal runaway.

[0138] In some embodiments of this application, reference is made to Figure 2As shown, the second cold plate 50 includes a heat exchange plate portion 51 and a connecting plate portion 52. There are multiple heat exchange plate portions 51, which extend along a first direction and are spaced apart in a second direction. A medium channel for containing heat exchange medium is formed in the heat exchange plate portion 51. The connecting plate portion 52 is connected between two adjacent heat exchange plate portions 51. Multiple through holes 521 are formed on the connecting plate portion 52 along a third direction. The multiple through holes 521 correspond one-to-one with the pressure relief structure of multiple battery cells 21 of the battery cell assembly 20. The pressure relief structure is connected to the pressure relief channel through the corresponding through hole 521.

[0139] In the above technical solution, the second cold plate 50 includes a heat exchange plate portion 51 and a connecting plate portion 52. The heat exchange plate portion 51 is used to attach to the battery cell assembly 20 to achieve efficient heat exchange. The connecting plate portion 52 is provided with through holes 521 that correspond one-to-one with the pressure relief structure. When thermal runaway occurs, the high-temperature medium can flow to the pressure relief channel through the through holes 521, facilitating the smooth discharge of the high-temperature medium during thermal runaway. In addition, the connecting plate portion 52 is connected between adjacent heat exchange plate portions 51, so that the second cold plate 50 is formed as an integral structure, which helps to reduce the number of parts and improve assembly efficiency.

[0140] Secondly, embodiments of this application also provide an electrical device 1, including the battery device 100 of any of the above embodiments.

[0141] In the above technical solution, the overall performance of the power-consuming device 1 is improved by incorporating the battery device 100.

[0142] The following will refer to Figures 2-7 The present application describes a battery device 100 according to two specific embodiments.

[0143] Example 1, refer to Figure 2 and Figure 3 The battery device 100 includes a housing 10, battery cell assemblies 20, a flexible heat exchanger 30, a first cold plate 40, a second cold plate 50, a first manifold 60, and a second manifold 70. The housing 10 includes a main body and a cover. The main body defines a top-open cavity, and the cover seals the top of the main body. Two structural beams are provided inside the main body, extending along the width direction of the housing 10 and spaced apart along the length direction of the housing 10. There are four battery cell assemblies 20, which are arranged between the two structural beams. The four battery cell assemblies 20 are arranged sequentially along the width direction of the housing 10. Each battery cell assembly 20 includes multiple battery cells 21 arranged in a stacked manner along the length direction of the housing 10. The thickness direction of the battery cells 21 is parallel to the length direction of the housing 10.

[0144] Reference Figure 2 and Figure 3The battery cell 21 includes: a housing, an electrode assembly, terminals 211, and a pressure relief structure. The housing is rectangular in shape, and the length of the housing is parallel to the width of the housing 10. The electrode assembly is located inside the housing. There are two terminals 211, which are positive terminals and negative terminals respectively. The positive terminals and negative terminals are respectively located on opposite sides of the housing along the width of the housing 10 and are located near the housing cover. The pressure relief structure is located at the bottom of the housing.

[0145] Reference Figure 2 The first cold plate 40 is arranged between the box cover and multiple battery cell modules 20, the second cold plate 50 is arranged between the bottom wall of the receiving cavity and the battery cell module 20, and the number of flexible heat exchange components 30 is three and arranged between two adjacent battery cell modules 20.

[0146] Reference Figure 2 The second cold plate 50 includes a heat exchange plate portion 51 and a connecting plate portion 52. There are four heat exchange plate portions 51. The multiple heat exchange plate portions 51 extend along the length direction of the housing 10 and are spaced apart in the width direction of the housing 10. A medium channel for containing the heat exchange medium is formed in the heat exchange plate portion 51. The connecting plate portion 52 is connected between two adjacent heat exchange plate portions 51. Multiple through holes 521 are formed on the connecting plate portion 52 in the vertical direction. The multiple through holes 521 correspond one-to-one with the pressure relief structure of the multiple battery cells 21 of the battery cell assembly 20. The pressure relief structure is connected to the pressure relief channel located on the lower side of the second cold plate 50 through the corresponding through holes 521.

[0147] like Figure 3 As shown, there are three flexible heat exchangers 30 arranged between two adjacent battery cell assemblies 20. The flexible heat exchangers 30 and the pole post 211 are arranged in the vertical direction. The flexible heat exchangers 30 are located on the lower side of the pole post 211 and are attached to the surface of the housing of the battery cell 21 located on the lower side of the pole post 211.

[0148] like Figure 4 and Figure 5 As shown, the flexible heat exchanger 30 includes: a flexible membrane 31, a supporting frame 32, an inlet connector 33, and an outlet connector 34. The flexible membrane 31 is a flexible thin-film material and includes an anti-corrosion layer, a metal layer, and a wear-resistant layer stacked along the thickness direction. The anti-corrosion layer is a polypropylene material layer, the metal layer is an aluminum layer, and the wear-resistant layer is a nylon layer. The outer nylon layer resists assembly friction and puncture damage from the edges and corners of the battery cells 21 and the rigid structure of the wiring harness; the middle aluminum layer achieves sealing and isolation of the heat exchange channel, reducing the risk of leakage; the inner PP material is resistant to long-term immersion corrosion by the heat exchange medium, improving the durability of the flexible heat exchanger 30 and reducing the after-sales failure rate.

[0149] like Figure 4 and Figure 5As shown, the support frame 32 is connected to the outer surface of the flexible membrane 31. The support frame 32 includes crossbars 321, connecting rods 322, and intermediate rods 323. There are two crossbars 321, which extend along the length of the housing 10 and are spaced apart in the vertical direction. The intermediate rod 323 extends along the length of the housing 10 and is located between the two crossbars 321. The two connecting rods 322 extend in the vertical direction and are respectively arranged at both ends of the two crossbars 321. One end of the two crossbars 321 and one end of the intermediate rod 323 are connected to one of the connecting rods 322, and the other end of the two crossbars 321 and the other end of the intermediate rod 323 are connected to the other connecting rod 322.

[0150] like Figure 4 and Figure 5 As shown, the length of the housing 10 is in the front-to-back direction. The inlet connector 33 and outlet connector 34 are arranged on the front side of the support frame 32 and connected to the connecting rod 322 located on the front side. A connecting channel is formed on the connecting rod 322 located on the rear side. Two branch channels are defined within the flexible membrane 31, extending along the length of the housing 10 and spaced apart in the vertical direction. The front ends of the two branch channels are connected to the inlet connector 33 and the outlet connector 34, respectively, and the rear ends of the two branch channels are connected through the connecting channel. This forms a U-shaped closed-loop channel structure within the flexible heat exchanger 30, which makes the flow distribution of the heat exchange medium uniform, stabilizes the circulation resistance, reduces dead zone heat stagnation areas, and achieves uniform heat dissipation over the entire vertical area of ​​the side of the battery cell 21, reducing local temperature differences.

[0151] In this embodiment, addressing the issue of concentrated heat generation on the fast-charging side of the battery cell 21 with dual pole posts 211, a flexible heat exchanger 30 is arranged on the same side of the pole post 211 of the battery cell 21 and on the lower side of the pole post 211. This achieves targeted heat dissipation of the heat source nearby, significantly shortens the heat exchange path between the pole post 211 and the side structure of the battery cell 21, effectively reduces the local maximum temperature of the pole post 211 under fast charging conditions, reduces the risk of local thermal runaway, and significantly improves the fast-charging rate performance and operational reliability of the battery cell 21.

[0152] Meanwhile, in this embodiment, the support frame 32 of the flexible heat exchanger 30 is formed as a multi-point external frame, which can provide shaping support for the flexible membrane 31, reduce the risk of deformation and collapse of the flexible membrane 31 due to liquid filling expansion, improve the overall structural stability of the flexible heat exchanger 30, and retain flexible deformation margin to meet the heat exchange requirements. The flexible heat exchanger 30, through the external frame combined with the multi-layer composite flexible membrane 31, achieves high-strength sealing, wear resistance, and corrosion resistance while retaining the flexible deformable characteristics of the flexible membrane 31. This reduces the risk of puncture leakage and corrosion failure of the flexible heat exchanger 30 under module assembly and vibration conditions, improving the reliability of the battery device 100. Furthermore, in this embodiment, after the heat exchange medium is introduced, the flexible membrane 31 can adaptively conform to the curved / planar structure of the side of the battery cell 21, eliminating heat exchange gaps, improving contact heat exchange efficiency, and significantly improving the uniformity of heat dissipation on the side of the battery cell 21.

[0153] Furthermore, the battery device 100 of this embodiment forms a three-dimensional heat dissipation system by setting multiple flexible heat exchangers 30 and the first cold plate 40 and second cold plate 50 at the top and bottom of the battery cell assembly 20. This reduces the risk of uneven heating and cooling and localized heat accumulation in the battery cell assembly 20 with dual-sided terminal posts 211, effectively improving the overall temperature consistency of the battery device 100, reducing the degradation difference of the battery cells 21, and extending the overall service life of the battery device 100. Moreover, the battery device 100 of this embodiment does not require changes to the terminal post 211 structure and group arrangement of the battery cells 21. The thermal management upgrade of the battery device 100 can be completed simply by adding flexible heat exchangers 30 on the sides. It has strong structural compatibility and is suitable for product iterations of battery cells 21 with new and old dual-sided terminal posts.

[0154] Example 2, as Figure 6 and Figure 7 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the support frame 32 of the flexible heat exchanger 30 in Embodiment 1 is external and arranged on the outer surface of the flexible membrane 31, while the support frame 32 of the flexible heat exchanger 30 in this Embodiment 2 is internal and arranged inside the flexible membrane 31, with the connecting flow channel formed at the rear end of the intermediate rod 323.

[0155] In this embodiment, the flexible heat exchanger 30 of the battery device 100 adopts an integrated structure with built-in covering, which is beneficial to improve the integration of the flexible membrane 31 and the support frame 32, making the overall structure of the flexible heat exchanger 30 stronger and the vibration resistance better. It is suitable for the complex bumpy and vibration operating conditions of the battery device 100, and reduces the risk of heat dissipation failure caused by the displacement and detachment of the flexible heat exchanger 30.

[0156] In the above technical solution, the flexible heat exchanger 30 has two assembly options: built-in and external. The battery device 100 can be selected as needed to adapt to different product requirements such as compact battery modules and / or battery modules under high vibration conditions. It has strong versatility, low modification cost, and can be compatible with existing battery device 100 assembly production lines, with excellent mass production capability.

[0157] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box (10); A battery cell assembly (20) is disposed within the housing (10) and includes a plurality of battery cells (21) arranged in sequence along a first direction; A flexible heat exchanger (30) is disposed within the housing (10). The flexible heat exchanger (30) includes a flexible membrane (31) and a supporting frame (32). The supporting frame (32) is connected to and supports the flexible membrane (31). A heat exchange channel for containing the heat exchange medium is formed within the flexible heat exchanger (30). The flexible heat exchanger (30) exchanges heat with the battery cell assembly (20) through the flexible membrane (31). The electrode post (211) of the battery cell (21) is arranged on at least one side of the battery cell assembly (20) in the second direction, and the flexible heat exchanger (30) and the electrode post (211) are arranged on the same side of the battery cell assembly (20) in the second direction, wherein the first direction intersects the second direction.

2. The battery device according to claim 1, characterized in that, The flexible heat exchanger (30) is disposed on one side of the plurality of poles (211) of the battery cell assembly (20) in the third direction, wherein the first direction, the second direction and the third direction intersect each other and are not coplanar.

3. The battery device according to claim 1, characterized in that, The flexible membrane (31) includes a metal layer and an anti-corrosion layer stacked in the thickness direction of the flexible membrane (31), and the anti-corrosion layer is disposed on the side of the metal layer facing the heat exchange channel.

4. The battery device according to claim 3, characterized in that, The metal layer is an aluminum material layer, and / or the anti-corrosion layer is a polypropylene material layer.

5. The battery device according to claim 3, characterized in that, The flexible membrane (31) further includes a wear-resistant layer, which is disposed on the side of the metal layer away from the anti-corrosion layer.

6. The battery device according to claim 5, characterized in that, The wear-resistant layer is a nylon material layer.

7. The battery device according to any one of claims 1-6, characterized in that, The support frame (32) is disposed inside the flexible membrane (31), or the support frame (32) is fixed to the outer surface of the flexible membrane (31).

8. The battery device according to any one of claims 1-6, characterized in that, The support frame (32) includes: crossbars (321) and connecting rods (322). There are two crossbars (321), which extend along a first direction and are spaced apart in a third direction. The third direction intersects with the first direction. There are two connecting rods (322), which are respectively arranged on both sides of the crossbars (321) in the first direction and connect the two crossbars (321).

9. The battery device according to claim 8, characterized in that, The support frame (32) further includes: a middle rod (323), which extends along the first direction and is arranged between the two crossbars (321), and the two ends of the middle rod (323) are respectively connected to the two connecting rods (322).

10. The battery device according to claim 9, characterized in that, The supporting frame (32) is fixed to the outer surface of the flexible membrane (31). The intermediate rod (323) includes two rods (3231). The two rods (3231) extend along the first direction and are spaced apart and arranged opposite each other in the second direction. The flexible membrane (31) is sandwiched between the two rods (3231) of the intermediate rod (323). The first direction, the second direction and the third direction intersect each other and are not coplanar.

11. The battery device according to claim 9, characterized in that, The heat exchange channel of the flexible heat exchanger (30) includes a plurality of branch channels, which extend along the first direction and are spaced apart in the third direction. The plurality of branch channels are connected in series and / or in parallel.

12. The battery device according to claim 11, characterized in that, The flexible heat exchanger (30) further includes: a liquid inlet connector (33) and a liquid outlet connector (34). The liquid inlet connector (33) and the liquid outlet connector (34) are disposed on one of the connecting rods (322) and communicate with the heat exchange channel. There are two branch channels. A connecting channel is formed at the end of the support frame (32) away from the liquid inlet connector (33) and the liquid outlet connector (34). The ends of the two branch channels away from the liquid inlet connector (33) and the liquid outlet connector (34) are connected through the connecting channel.

13. The battery device according to claim 12, characterized in that, The supporting frame (32) is fixed to the outer surface of the flexible membrane (31), and the connecting channel is formed within another connecting rod (322) arranged away from the inlet connector (33) and the outlet connector (34); or, The support frame (32) is located inside the flexible membrane (31), and the connecting channel is formed at one end of the intermediate rod (323) away from the liquid inlet connector (33) and the liquid outlet connector (34).

14. The battery device according to claim 1, characterized in that, The number of battery cell assemblies (20) is multiple, and the multiple battery cell assemblies (20) are arranged sequentially along a second direction. The first direction intersects with the second direction. The number of flexible heat exchangers (30) is multiple and they are disposed between two adjacent battery cell assemblies (20) and / or on at least one side of the multiple battery cell assemblies (20) in the second direction.

15. The battery device according to claim 14, characterized in that, The battery device (100) further includes: a first cold plate (40), which is disposed inside the housing (10) and arranged on one side of the plurality of battery cell assemblies (20) in a third direction, for heat exchange with the plurality of battery cell assemblies (20), wherein the first direction, the second direction and the third direction intersect each other and are not coplanar.

16. The battery device according to claim 15, characterized in that, The enclosure (10) includes a main body and a cover. The main body defines a top-open receiving cavity. The battery cell assembly (20) is disposed in the receiving cavity. The cover seals the top of the main body. The first cold plate (40) is disposed between the cover and the battery cell assembly (20).

17. The battery device according to claim 15, characterized in that, The battery device (100) further includes a second cold plate (50), which is disposed inside the housing (10) and arranged on the other side of the plurality of battery cell assemblies (20) in the third direction, for heat exchange with the plurality of battery cell assemblies (20).

18. The battery device according to claim 17, characterized in that, The battery cell (21) is provided with a pressure relief structure, which is arranged on the side of the battery cell (21) facing the second cold plate (50) in the third direction. The housing (10) has a plurality of pressure relief channels that correspond one-to-one with the plurality of battery cell assemblies (20). The pressure relief channels are opposite to and connected to the pressure relief structures of the plurality of battery cells (21) of the corresponding battery cell assembly (20) in the third direction.

19. The battery device according to claim 18, characterized in that, There are multiple second cold plates (50), which are arranged at intervals along the second direction. Along the second direction, the pressure relief structure and the pressure relief channel are arranged between two adjacent second cold plates (50); or, The second cold plate (50) includes a heat exchange plate portion (51) and a connecting plate portion (52). There are multiple heat exchange plate portions (51), which extend along the first direction and are spaced apart in the second direction. A medium channel for containing heat exchange medium is formed in the heat exchange plate portion (51). The connecting plate portion (52) is connected between two adjacent heat exchange plate portions (51). Multiple through holes (521) are formed on the connecting plate portion (52) along the third direction. The multiple through holes (521) correspond one-to-one with the pressure relief structure of the multiple battery cells (21) of the battery cell assembly (20). The pressure relief structure is connected to the pressure relief channel through the corresponding through hole (521).

20. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-19.

Images