Battery device and electric device

Abstract

The application provides a battery device and an electric device. The heat exchange device comprises a main body structure and a shunt plate. The main body structure is provided with a medium cavity. The shunt plate is arranged in the medium cavity. The shunt plate and the inner wall surface of the medium cavity form a heat exchange flow channel. The shunt plate comprises a main body layer and a protective layer. The main body layer comprises a first surface and a second surface arranged oppositely along the thickness direction of the shunt plate. The first surface and the second surface are both covered with the protective layer. The potential of the protective layer is lower than that of the main body structure. Since the main body layer of the shunt plate is covered with the protective layer and the potential of the protective layer is lower than that of the main body structure, the protective layer with a lower potential can be preferentially corroded as an anode, and the main body structure can be protected as a cathode and is not prone to corrosion. The wall surface of the main body structure surrounding the medium cavity is not prone to corrosion, the durability and reliability of the heat exchange device are improved, and the reliability of the battery device is improved.

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] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, how to improve the reliability of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device, the battery device having good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery device, which includes a housing, a battery cell pack, and a heat exchange device. The battery cell pack is disposed in the housing. The heat exchange device is disposed in the housing and includes a main structure and a flow divider. A medium cavity is formed in the main structure. The flow divider is disposed in the medium cavity. The flow divider and the inner wall of the medium cavity form a heat exchange channel. The flow divider includes a main layer and a protective layer. The main layer includes a first surface and a second surface disposed opposite to each other along the thickness direction of the flow divider. At least one of the first surface and the second surface is covered by the protective layer. The potential of the protective layer is lower than the potential of the main structure.

[0006] Because multiple heat exchange channels are formed by a flow divider plate disposed within the medium cavity and the inner wall of the medium cavity, the heat exchange channels do not need to be directly formed by stamping during the forming process. Instead, the medium cavity is directly formed by stamping, and then the flow divider plate is placed within the medium cavity. This reduces the processing difficulty of the heat exchange channels and improves the uniformity of the heat exchange medium distribution. In the above structure, since at least one of the first and second surfaces of the main body layer in the flow divider plate is covered with a protective layer, and the potential of the protective layer is lower than that of the main structure, the lower potential of the protective layer can act as the anode and be preferentially corroded, while the main structure can act as the cathode and be protected from corrosion. This makes the wall of the medium cavity formed by the main structure less susceptible to corrosion, improving the durability and reliability of the heat exchange device and thus enhancing the reliability of the battery device.

[0007] According to some embodiments of the present application, the battery device is provided with multiple heat exchange channels, each extending along a first direction and arranged sequentially along a second direction. The second direction intersects with the first direction, so that the heat exchange medium flows in the multiple heat exchange channels, achieving uniform flow distribution. This makes the heat exchange between the heat exchange device and the battery cell group more uniform, which is beneficial to improving the temperature uniformity of the battery cell group.

[0008] According to some embodiments of this application, the battery device has a main structure including a first plate and a second plate stacked along a third direction. The third direction, the second direction, and the first direction intersect each other but are not coplanar. The surface of the first plate facing the second plate is recessed in a direction away from the second plate to form a first groove. The surface of the second plate facing the first plate is recessed in a direction away from the first plate to form a second groove. The second groove and the first groove are connected to form a dielectric cavity, which allows the dielectric cavity to be formed by a stamping process, thus reducing the processing difficulty of the dielectric cavity.

[0009] According to some embodiments of the battery device provided in this application, a first plate protrudes from the surface of the first plate facing away from the second plate in a direction away from the second plate to form a first protrusion. A first groove is disposed opposite to the first protrusion along a third direction. By forming the first protrusion from the surface of the first plate facing away from the second plate in a direction away from the second plate, and by disposing the first groove opposite to the first protrusion along a third direction, the first protrusion can compensate for the reduction in thickness of the first plate caused by the formation of the first groove, which is beneficial to improving the structural strength of the first plate and reducing the possibility of breakage. Similarly, a second plate protrudes from the surface of the second plate facing away from the first plate in a direction away from the first plate to form a second protrusion. A second groove is disposed opposite to the second protrusion along a third direction. By forming the second protrusion from the surface of the second plate facing away from the first plate in a direction away from the first plate, and by disposing the second groove opposite to the second protrusion along a third direction, the second protrusion can compensate for the reduction in thickness of the second plate caused by the formation of the second groove, which is beneficial to improving the structural strength of the second plate and reducing the possibility of breakage.

[0010] According to some embodiments of the present application, the battery device has the orthographic projection of the first groove and the orthographic projection of the second groove in a plane perpendicular to a third direction, so that the opening of the first groove can be connected to the opening of the second groove, and the first groove and the second groove can form a medium cavity with a smooth inner surface, which is beneficial to reduce the resistance to the flow of heat exchange medium.

[0011] According to some embodiments of the present application, the battery device includes multiple heat exchange channels divided into two groups, each group of heat exchange channels including multiple heat exchange channels arranged sequentially along a second direction, and the two groups of heat exchange channels are respectively disposed on both sides of the flow divider in a third direction; the battery cell group includes at least two, the at least two battery cell groups are arranged along a third direction, a heat exchange device is provided between two adjacent battery cell groups, one of the two adjacent battery cell groups is attached to the first plate, and the other is attached to the second plate.

[0012] With the above structure, the two sets of heat exchange channels in the heat exchange device, located on the third-direction sides of the flow divider, can exchange heat with the battery cells arranged on the third-direction sides of the heat exchange device, which is beneficial to improving the utilization rate and heat exchange efficiency of the heat exchange device and reducing the heat exchange cost per unit area.

[0013] According to some embodiments of the battery device provided in this application, a shunt plate has a surface facing the first plate recessed in a direction away from the first plate to form a first flow channel groove. The first plate is connected to the shunt plate and covers the first flow channel groove. The first plate and the first flow channel groove form a first heat exchange channel. Multiple first heat exchange channels are arranged sequentially along a second direction to form one of two sets of heat exchange channels that is closer to the first plate in a third-direction upward direction. Similarly, a shunt plate has a surface facing the second plate recessed in a direction away from the second plate to form a second flow channel groove. The second plate is connected to the shunt plate and covers the second flow channel groove. The second plate and the second flow channel groove form a second heat exchange channel. Multiple second heat exchange channels are arranged sequentially along a second direction to form one of two sets of heat exchange channels that is farther away from the first plate in a third-direction upward direction. With this structure, the shunt plate can form two sets of heat exchange channels in the medium cavity. The heat exchange medium in the two sets of heat exchange channels can exchange heat with the two battery cell groups through the first plate and the second plate, respectively.

[0014] According to some embodiments of the present application, the battery device provided has a first protrusion structure formed by the surface of the shunt plate facing away from the first plate in a direction away from the first plate, and a first flow channel groove is disposed opposite to the first protrusion structure in a third direction; the second protrusion structure is formed by the surface of the shunt plate facing away from the second plate in a direction away from the second plate, and a second flow channel groove is disposed opposite to the second protrusion structure in a third direction; in a second direction, the first flow channel groove and the second flow channel groove are alternately disposed, so that the first flow channel groove and the second flow channel groove can be staggered in a third direction, so that the first flow channel groove and the second flow channel groove on the shunt plate can be formed simultaneously by a stamping process.

[0015] According to some embodiments of the battery device provided in this application, the cross-sectional shape of the first flow channel groove on the plane perpendicular to the first direction is trapezoidal, rectangular, triangular or arc-shaped, so that the first heat exchange channel formed by the first flow channel groove and the first plate can be a trapezoidal flow channel, rectangular flow channel, triangular flow channel or arc-shaped flow channel, so that the heat exchange medium flows more smoothly; the cross-sectional shape of the second flow channel groove on the plane perpendicular to the first direction is trapezoidal, rectangular, triangular or arc-shaped, so that the second heat exchange channel formed by the second flow channel groove and the second plate can be a trapezoidal flow channel, rectangular flow channel, triangular flow channel or arc-shaped flow channel, so that the heat exchange medium flows more smoothly.

[0016] According to some embodiments of the battery device provided in this application, in the extension direction of the heat exchange channel, the two ends of the flow divider plate are spaced apart from the two ends of the inner surface of the medium cavity to form guide cavities, and the guide cavities are connected to multiple heat exchange channels; the heat exchange device is provided with a heat exchange interface, and the heat exchange interface is connected to the guide cavities. By spaced apart from the two ends of the flow divider plate in the extension direction of the heat exchange channel to the two ends of the inner surface of the medium cavity in the first direction, guide cavities communicating with multiple heat exchange channels are formed on both sides of the flow divider plate in the extension direction of the heat exchange channel, so that heat exchange medium can be synchronously circulated into multiple heat exchange channels.

[0017] According to some embodiments of the present application, the battery device is provided with at least two medium cavities, which are spaced apart along a direction intersecting the extension direction of the heat exchange channel, so that the at least two medium cavities can be distributed over a larger area of ​​the heat exchange device, which is beneficial to improving the heat exchange efficiency between the heat exchange device and the battery cell assembly.

[0018] According to some embodiments of the battery device provided in this application, the substrate material of the protective layer is magnesium or zinc, and the substrate material of the main structure is copper, aluminum, or iron. This material combination enables the heat exchange device to achieve efficient corrosion resistance while also taking into account good heat exchange performance, structural strength, lightweight level, and processing economy, thus meeting the usage requirements of the battery device.

[0019] Secondly, some embodiments of this application provide an electrical device that includes a battery device provided by any of the above-described technical solutions, the battery device being used to provide electrical energy.

[0020] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0021] Some embodiments of this application provide a battery device including a housing, a battery cell pack, and a heat exchange device. The battery cell pack is disposed in the housing. The heat exchange device is disposed in the housing and includes a main structure and a flow divider. A medium cavity is formed in the main structure, and the flow divider is disposed in the medium cavity. The flow divider and the inner wall of the medium cavity form a heat exchange channel. The flow divider includes a main layer and a protective layer. The main layer includes a first surface and a second surface disposed opposite to each other along the thickness direction of the flow divider. At least one of the first surface and the second surface is covered by the protective layer, and the potential of the protective layer is lower than that of the main structure. Since multiple heat exchange channels are formed by the flow divider disposed in the medium cavity and the inner wall of the medium cavity, the heat exchange channels do not need to be directly stamped to form complex multiple heat exchange channels during the forming process. Instead, the medium cavity is directly stamped, and then the flow divider is disposed in the medium cavity. This reduces the processing difficulty of the heat exchange channels and improves the uniformity of the heat exchange medium distribution. In the above structure, since at least one of the first and second surfaces of the main body layer in the shunt plate is covered by a protective layer, and the potential of the protective layer is lower than that of the main body structure, the protective layer with the lower potential can be preferentially corroded as an anode, and the main body structure can be protected as a cathode and is not easily corroded. This makes the wall of the main body structure surrounding the medium cavity less susceptible to corrosion, improving the durability and reliability of the heat exchange device and helping to improve the reliability of the battery device. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0024] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application;

[0025] Figure 3 Perspective view of a heat exchange device provided in some embodiments of this application;

[0026] Figure 4 for Figure 3 Sectional view at EE;

[0027] Figure 5 for Figure 4 Enlarged view at F1;

[0028] Figure 6 for Figure 4 Enlarged view at F2;

[0029] Figure 7 This is a schematic diagram of the internal structure of the diverter provided in some embodiments of this application;

[0030] Figure 8 This is a split schematic diagram of the heat exchange device provided in some embodiments of this application;

[0031] Figure 9 This is a schematic diagram from one perspective of a heat exchange device provided in some embodiments of this application being held by a battery cell assembly;

[0032] Figure 10 This is a schematic diagram from another perspective of a heat exchange device provided in some embodiments of this application being held by a battery cell assembly;

[0033] Figure 11 This is a partial structural schematic diagram of the flow divider plate in the heat exchange device provided in some embodiments of this application;

[0034] Figure 12 This is a schematic diagram of the structure of the flow divider plate in the heat exchange device provided in the first embodiment of this application;

[0035] Figure 13 This is a schematic diagram of the structure of the flow divider plate in the heat exchange device provided in the second embodiment of this application;

[0036] Figure 14 This is a schematic diagram of the structure of the flow divider plate in the heat exchange device provided in the third embodiment of this application;

[0037] Figure 15 This is a schematic diagram of the structure of the flow divider in the heat exchange device provided in the fourth embodiment of this application.

[0038] In the diagram:

[0039] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Housing space; 7. Battery cell pack; 70. Battery cell; 8. Heat exchange device;

[0040] 81. Main structure; 811. First plate; 8111. First groove; 8112. First protrusion; 812. Second plate; 8121. Second groove; 8122. Second protrusion;

[0041] 82. Diverter plate; 821. Main body layer; 8211. First surface; 8212. Second surface; 822. Protective layer; 823. First flow channel groove; 824. Second flow channel groove; 825. First protrusion structure; 826. Second protrusion structure;

[0042] 83. Medium cavity; 84. First heat exchange channel; 85. Second heat exchange channel; 86. Guide cavity; 9. Heat exchange interface;

[0043] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0044] 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.

[0045] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0046] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., 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 do not 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.

[0047] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in individual battery cells such as energy storage containers or energy storage cabinets. As the application fields of battery devices continue to expand, the requirements for the reliability of battery devices are also constantly increasing.

[0051] 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 multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0052] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0053] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0054] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0055] As an example, a battery cell group can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0056] In some embodiments, the battery device may include one or more battery packs, which may include one or more battery cell groups. As an example, a battery pack includes a housing and one or more battery cell groups, the battery cell groups being housed, for example, in a fixed manner within the housing. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0057] 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 battery cell pack. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0058] 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 battery cells.

[0059] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0060] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0061] As the application of battery devices continues to expand across various fields, higher demands are being placed on their performance. Improving the reliability of battery devices is receiving increasing attention from those skilled in the art.

[0062] As devices that provide electrical energy, batteries are characterized by high specific energy and high power density. During charging and discharging, individual battery cells typically generate heat, causing their temperature to rise. To ensure the reliability of these cells, heat exchange devices are used to control their temperature through heat exchange with the cells. These heat exchange devices contain heat exchange channels for the circulating heat exchange medium, which carries away the heat generated by the battery cells. In some cases, these heat exchange channels are formed using a stamping process. The large number of these channels undoubtedly increases the difficulty of stamping. Furthermore, while the outer surface of the heat exchange device can be protected using processes such as electrophoretic coating, the corrosion protection of the internal heat exchange channels is challenging, negatively impacting the durability and reliability of the heat exchange device.

[0063] To improve the reliability of battery devices, some embodiments of this application provide a battery device including a housing, a battery cell pack, and a heat exchange device. The battery cell pack is disposed in the housing. The heat exchange device is disposed in the housing and includes a main structure and a flow divider. A medium cavity is formed in the main structure, and the flow divider is disposed in the medium cavity. The flow divider and the inner wall of the medium cavity form a heat exchange channel. The flow divider includes a main layer and a protective layer. The main layer includes a first surface and a second surface disposed opposite to each other along the thickness direction of the flow divider. At least one of the first surface and the second surface is covered by the protective layer, and the potential of the protective layer is lower than that of the main structure. Since multiple heat exchange channels are formed by the flow divider disposed in the medium cavity and the inner wall of the medium cavity, the heat exchange channels do not need to be directly stamped to form complex multiple heat exchange channels during the forming process. Instead, the medium cavity is directly stamped, and then the flow divider is disposed in the medium cavity. This reduces the processing difficulty of the heat exchange channels and improves the uniformity of the heat exchange medium distribution. In the above structure, since at least one of the first and second surfaces of the main body layer in the shunt plate is covered by a protective layer, and the potential of the protective layer is lower than that of the main body structure, the protective layer with the lower potential can be preferentially corroded as an anode, and the main body structure can be protected as a cathode and is not easily corroded. This makes the wall of the main body structure surrounding the medium cavity less susceptible to corrosion, improving the durability and reliability of the heat exchange device and helping to improve the reliability of the battery device.

[0064] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0065] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0066] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0067] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application.

[0068] like Figure 1As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0069] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0070] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0071] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and a battery cell pack 7, which is housed within the housing 5. The battery cell pack 7 may include multiple battery cells, each of which can be the smallest unit that makes up a battery.

[0072] The housing 5 is used to accommodate the battery cell pack 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a receiving space 5c for accommodating the battery cell pack 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b to form a housing 5 with the receiving space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the receiving space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0073] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0074] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0075] In battery device 2, the battery cell group 7 can contain one or more battery cells. If there are multiple battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed in the housing 5. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole and housed in the housing 5.

[0076] Some embodiments of this application provide a battery device 2, which includes a housing 5, a battery cell pack 7, and a heat exchange device 8. The battery cell pack 7 is disposed in the housing 5; the heat exchange device 8 is disposed in the housing 5, as shown in the reference. Figure 3 , Figure 4 , Figure 5 and Figure 6 The heat exchange device 8 includes a main structure 81 and a flow divider 82. A medium cavity 83 is formed in the main structure 81, and the flow divider 82 is disposed in the medium cavity 83. The flow divider 82 and the inner wall surface of the medium cavity 83 form a heat exchange channel. (Reference) Figure 7 The diverter plate 82 includes a main body layer 821 and a protective layer 822. The main body layer 821 includes a first surface 8211 and a second surface 8212 disposed opposite to each other along the thickness direction of the diverter plate 82. At least one of the first surface 8211 and the second surface 8212 is covered with the protective layer 822. The potential of the protective layer 822 is lower than the potential of the main body structure 81.

[0077] The housing 5 can be a component that provides a receiving space 5c, which is used to accommodate components located inside the battery device 2, such as the battery cell pack 7, wiring harness, circuit board, and heat exchange device 8, so that the housing 5 can provide protection for the battery cell pack 7, wiring harness, circuit board, heat exchange device 8, and other components. The housing 5 can be the first housing part 5a in the aforementioned scheme, or the second housing part 5b in the aforementioned scheme.

[0078] The battery cell group 7 can be an independent module formed by arranging and fixing multiple battery cells 70. The battery cell 70 can be a rechargeable battery cell, which is a battery cell that can be recharged after discharge to activate its active materials and continue to be used. The battery cell 70 can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc.

[0079] For example, the battery cell 70 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0080] When the battery device 2 includes multiple battery cells 70, the multiple battery cells 70 can be arranged and fixed to form a battery module.

[0081] The heat exchange device 8 can be a device for exchanging heat with the battery cell group 7. It is set in the housing space 5c of the housing 5 and can exchange heat with the battery cell group 7 in the housing 5 to keep the battery cell 70 in a suitable temperature range, which is beneficial to keep the battery cell 70 in a suitable working state.

[0082] The main structure 81 can be the main structural part of the heat exchange device 8, which together with the flow divider 82 forms a heat exchange channel. The medium cavity 83 can be a hollow structure for introducing the heat exchange medium. The medium cavity 83 formed in the main structure 81 can mean that the medium cavity 83 is formed inside the main structure 81, and the main structure 81 is a hollow structure, so that the heat exchange medium can flow smoothly into and temporarily exist inside the medium cavity 83.

[0083] The flow divider 82 can be used to divide the medium cavity 83 formed inside the main structure 81 into heat exchange channels, allowing the heat exchange medium to flow into the heat exchange channels, achieving uniform flow distribution. This results in more uniform heat exchange between the heat exchange device 8 and the battery cell group 7, which is beneficial for improving the temperature uniformity of the battery cell group 7. The flow divider 82 can also enhance the turbulent flow of the heat exchange medium, improving the heat exchange efficiency of the heat exchange device 8. In addition, the flow divider 82 can also serve as a supporting and reinforcing structure for the main structure 81, enhancing the structural strength of the heat exchange device 8. Multiple flow dividers 82 can be provided and arranged according to the design requirements of the heat exchange channels of the heat exchange device 8.

[0084] The flow divider 82 is disposed in the medium cavity 83. This means that the flow divider 82 is located within the medium cavity 83 and connected to the inner wall surface of the medium cavity 83, thus enabling the flow divider 82 to divide the medium cavity 83. The flow divider 82 and the inner wall surface of the medium cavity 83 form heat exchange channels. This means that after the flow divider 82 divides the medium cavity 83, the outer surface of the flow divider 82 and the inner wall surface of the medium cavity 83 form multiple heat exchange channels, allowing the heat exchange medium flowing into the medium cavity 83 to flow dispersedly into multiple heat exchange channels. The main body layer 821 can be the main structural layer in the flow divider 82, located at the center of the flow divider 82, used to support the flow divider 82. The protective layer 822 can be a structural layer in the flow divider 82 that provides protection and reduces corrosion of the main structure 81. By setting the potential of the protective layer 822 to be lower than that of the main structure 81, the protective layer 822, with its lower potential, can act as an anode and more easily react with chloride and sulfate ions in the heat exchange medium, thus being oxidized and corroded. The main structure 81, acting as a cathode, can be protected and is less likely to react with the heat exchange medium and corrode.

[0085] The first surface 8211 and the second surface 8212 are two surfaces of the main body layer 821 that are disposed opposite to each other in the thickness direction of the diversion plate 82. At least one of the first surface 8211 and the second surface 8212 is covered with a protective layer 822. This can be achieved by having the first surface 8211 covered with the protective layer 822, while the second surface 8212 is not covered with the protective layer 822, thus reducing the amount of material used in the protective layer 822 and lowering costs. Alternatively, the first surface 8211 may not have the protective layer 822, while the second surface 8212 is covered with it, again reducing the amount of material used in the protective layer 822 and lowering costs. Furthermore, both the first surface 8211 and the second surface 8212 may be covered with a protective layer 822, allowing the protective layer 822 to completely cover the outer surface of the main layer 821. This prevents the heat exchange medium from easily contacting the main layer 821 of the distributor plate 82, making it less likely for the heat exchange medium to react with the main layer 821, reducing the possibility of corrosion of the main layer 821, and improving the durability and reliability of the distributor plate 82.

[0086] The lower potential of the protective layer 822 compared to the main structure 81 can mean that the protective layer 822 is made of a substrate material with a lower potential, while the main structure 81 is made of a substrate material with a relatively higher potential. In some embodiments, the substrate material of the protective layer 822 is magnesium, and the substrate material of the main structure 81 is copper, aluminum, zinc, or iron, which have a higher potential than magnesium. In some embodiments, the substrate material of the protective layer 822 is aluminum, and the substrate material of the main structure 81 is copper, zinc, or iron, which have a higher potential than aluminum. In some embodiments, the substrate material of the protective layer 822 is zinc, and the substrate material of the main structure 81 is copper or iron, which have a higher potential than zinc. In some embodiments, the substrate material of the protective layer 822 is iron, and the substrate material of the main structure 81 is copper, which has a higher potential than iron.

[0087] Since multiple heat exchange channels are formed by the flow divider plate 82 disposed in the medium cavity 83 and the inner wall surface of the medium cavity 83, the heat exchange channels do not need to be directly stamped to form complex multiple heat exchange channels during the forming process. Instead, the medium cavity 83 is directly stamped, and then the flow divider plate 82 is disposed in the medium cavity 83. This reduces the processing difficulty of the heat exchange channels and improves the uniformity of the heat exchange medium distribution. In the above structure, since at least one of the first surface 8211 and the second surface 8212 of the main body layer 821 in the flow divider plate 82 is covered by the protective layer 822, and the potential of the protective layer 822 is lower than that of the main structure 81, the lower potential of the protective layer 822 can act as the anode and be preferentially corroded, while the main structure 81 can act as the cathode and be protected from corrosion. This makes the wall surface of the medium cavity 83 formed by the main structure 81 less susceptible to corrosion, improving the durability and reliability of the heat exchange device 8, and thus improving the reliability of the battery device 2.

[0088] In some embodiments, a plurality of heat exchange channels are provided, all of which extend along a first direction X and are arranged sequentially along a second direction Y, with the second direction Y intersecting the first direction X.

[0089] The heat exchange channels are provided in multiple ways. This means that the flow divider 82 divides the medium cavity 83 formed inside the main structure 81 into multiple heat exchange channels, so that the heat exchange medium can be distributed to multiple heat exchange channels. This allows the heat exchange medium to flow in multiple heat exchange channels, achieving uniform distribution of flow rate. This makes the heat exchange between the heat exchange device 8 and the battery cell group 7 more uniform, which is beneficial to improving the temperature uniformity of the battery cell group 7.

[0090] The fact that multiple heat exchange channels extend along the first direction X can mean that multiple heat exchange channels in the medium cavity 83 are arranged in parallel, and each heat exchange channel extends along the first direction X, which helps to reduce the resistance encountered by the heat exchange medium during flow.

[0091] By arranging multiple heat exchange channels sequentially along the second direction Y, and setting the second direction Y to intersect with the first direction X, the multiple heat exchange channels extending along the first direction X are arranged sequentially along the second direction Y. The second direction Y intersects with the first direction X, or the second direction Y and the first direction X can be set perpendicular to each other.

[0092] The extension direction of the heat exchange channels and the arrangement direction of multiple heat exchange channels can be perpendicular to each other, so that multiple heat exchange channels can play a role in a larger area in the heat exchange device 8; at the same time, it facilitates the processing and manufacturing of the heat exchange device 8.

[0093] In some embodiments, reference Figure 6 and Figure 8 The main structure 81 includes a first plate 811 and a second plate 812 stacked along the third direction Z. The third direction Z, the second direction Y and the first direction X intersect each other but are not coplanar. The surface of the first plate 811 facing the second plate 812 is recessed in the direction away from the second plate 812 to form a first groove 8111. The surface of the second plate 812 facing the first plate 811 is recessed in the direction away from the first plate 811 to form a second groove 8121. The second groove 8121 and the first groove 8111 are connected to form a medium cavity 83.

[0094] The third direction Z, the second direction Y, and the first direction X are perpendicular to each other, so that the extension direction of the heat exchange channel, the arrangement direction of the multiple heat exchange channels, and the recess direction of the first groove 8111 and the second groove 8121 can be perpendicular to each other.

[0095] The first plate 811 and the second plate 812 are two plate structures in the main structure 81, and they are stacked and connected along the third direction Z to form a medium cavity 83. The surface of the first plate 811 facing the second plate 812 is recessed in a direction away from the second plate 812 to form a first groove 8111. This can mean that the surface of the first plate 811 facing the second plate 812 is recessed inward, so that the first groove 8111 with an opening facing the second plate 812 is formed on the surface of the first plate 811 facing the second plate 812. For example, material can be removed from the surface of the first plate 811 facing the second plate 812 by machining such as milling, and the surface of the first plate 811 facing the second plate 812 is recessed inward to form the first groove 8111; or the first groove 8111 can be formed by stamping to deform the surface of the first plate 811 facing the second plate 812 inward.

[0096] The second plate 812, facing the first plate 811, is recessed in a direction away from the first plate 811 to form a second groove 8121. This can mean that the surface of the second plate 812 facing the first plate 811 is recessed inwards, creating a second groove 8121 with an opening facing the first plate 811 on the surface of the second plate 812 facing the first plate 811. For example, material can be removed from the surface of the second plate 812 facing the first plate 811 by machining such as milling, causing the surface of the second plate 812 facing the first plate 811 to be recessed inwards to form the second groove 8121; alternatively, a stamping process can be used to deform the surface of the second plate 812 facing the first plate 811 inwards to form the second groove 8121.

[0097] By stacking the first plate 811 and the second plate 812 along the third direction Z, the first plate 811 and the second plate 812 are interlocked with each other, so that the first groove 8111 and the second groove 8121 can form a cavity structure for introducing heat exchange medium inside the main structure 81, which makes it possible to process the medium cavity 83 by stamping process, which helps to reduce the processing difficulty of the medium cavity 83.

[0098] The second groove 8121 and the first groove 8111 are connected to form a medium cavity 83. This can mean that after the first plate 811 and the second plate 812 are stacked, the second groove 8121 and the first groove 8111 can be interlocked and connected to each other, so that the formed medium cavity 83 has a large volume.

[0099] For example, the flow divider 82 located in the medium cavity 83 is welded to the first plate 811 and the second plate 812, so that the materials of the flow divider 82, the first plate 811 and the second plate 812 can be fused together, which is beneficial to improving the structural strength of the heat exchange device 8.

[0100] In some embodiments, continue to refer to Figure 6 and Figure 8 The surface of the first plate 811 facing away from the second plate 812 protrudes in a direction away from the second plate 812 to form a first protrusion 8112. Along the third direction Z, the first groove 8111 is disposed opposite to the first protrusion 8112. The surface of the second plate 812 facing away from the first plate 811 protrudes in a direction away from the first plate 811 to form a second protrusion 8122. Along the third direction Z, the second groove 8121 is disposed opposite to the second protrusion 8122.

[0101] By forming a first protrusion 8112 by making the surface of the first plate 811 facing away from the second plate 812 protrude in a direction away from the second plate 812, and by making a first groove 8111 opposite to the first protrusion 8112 along the third direction Z, the first protrusion 8112 can compensate for the reduction in thickness of the first plate 811 caused by the formation of the first groove 8111, which is beneficial to improving the structural strength of the first plate 811 and reducing the possibility of breakage of the first plate 811. For example, the first plate 811 with the first groove 8111 can be made by a stamping process, which has a lower processing difficulty than forming a plate with multiple flow channels by a stamping process.

[0102] By forming a second protrusion 8122 by making the surface of the second plate 812 facing away from the first plate 811 protrude in a direction away from the first plate 811, and by making the second groove 8121 opposite to the second protrusion 8122 along the third direction Z, the second protrusion 8122 can compensate for the reduction in thickness of the second plate 812 caused by the formation of the second groove 8121, which is beneficial to improving the structural strength of the second plate 812 and reducing the possibility of breakage of the second plate 812. For example, the second plate 812 with the second groove 8121 can be manufactured by a stamping process, which has lower processing difficulty compared to forming a plate with multiple flow channels by a stamping process.

[0103] In some embodiments, the first plate 811 and the second plate 812 may be manufactured using a high-precision rolling process, resulting in smoother outer surfaces. For example, the flatness of the outer surfaces of the first plate 811 and the second plate 812 can be controlled within ±0.02 mm / m. 2 Within the range.

[0104] In some embodiments, in a plane perpendicular to the third direction Z, the orthographic projection of the first groove 8111 coincides with the orthographic projection of the second groove 8121.

[0105] By setting the orthographic projection of the first groove 8111 in a plane perpendicular to the third direction Z to coincide with the orthographic projection of the second groove 8121 in a plane perpendicular to the third direction Z, the first groove 8111 and the second groove 8121 are positioned opposite each other in the third direction Z. This allows the groove opening of the first groove 8111 to align with the groove opening of the second groove 8121 after the first plate 811 and the second plate 812 are stacked. This enables the first groove 8111 and the second groove 8121 to form a medium cavity 83 with a smooth inner surface, which helps to reduce the resistance to the flow of the heat exchange medium.

[0106] In some embodiments, the plurality of heat exchange channels are divided into two groups, each group including a plurality of heat exchange channels arranged sequentially along the second direction Y, and the two groups of heat exchange channels are respectively disposed on both sides of the flow divider 82 in the third direction Z; Reference Figure 9 and Figure 10 The battery cell group 7 includes at least two cells, which are arranged along the third direction Z. A heat exchange device 8 is provided between two adjacent battery cell groups 7. One of the two adjacent battery cell groups 7 is attached to the first plate 811 and the other is attached to the second plate 812.

[0107] The multiple heat exchange channels are divided into two groups, which means that the multiple heat exchange channels separated by the flow divider plate 82 in the medium cavity 83 are divided into two groups. The two groups of heat exchange channels are respectively arranged on both sides of the flow divider plate 82 in the third direction Z, so that the heat exchange medium is circulated in the two groups of heat exchange channels on both sides of the flow divider plate 82, so that the heat exchange device 8 has good heat exchange capacity on both sides of the third direction Z, and the heat exchange device 8 can perform efficient heat exchange with the battery cell group 7 located on both sides of the third direction Z of the heat exchange device 8.

[0108] Each heat exchange channel group includes multiple heat exchange channels arranged sequentially along the second direction Y. This can mean that each of the two heat exchange channel groups separated by the flow divider 82 includes multiple heat exchange channels, and the heat exchange channels in each group are arranged sequentially along the second direction Y. The multiple heat exchange channels in each group can extend along the first direction X.

[0109] At least two battery cell groups 7 are arranged along the third direction Z, and a heat exchange device 8 is sandwiched between two adjacent battery cell groups 7. This means that a heat exchange device 8 is sandwiched between any two adjacent battery cell groups 7 arranged along the third direction Z in the battery device 2, so that the heat exchange device 8 can exchange heat with the two battery cell groups 7 on both sides of the third direction Z.

[0110] By providing at least two battery cell groups 7 in the battery device 2, the battery device 2 includes a larger number of battery cells 70, which helps to increase the capacity of the battery device 2.

[0111] The first plate 811 is attached to one of the two adjacent battery cell groups 7 in the third direction Z, and the second plate 812 is attached to the other one. This allows one of the two adjacent battery cell groups 7 to exchange heat mainly with a set of heat exchange channels located on the side of the shunt plate 82 near the first plate 811, and the other to exchange heat mainly with a set of heat exchange channels located on the side of the shunt plate 82 near the second plate 812. This enables the two sets of heat exchange channels to efficiently and evenly remove the heat from the two battery cell groups 7 on both sides of the heat exchange device 8.

[0112] With the above structure, the two sets of heat exchange channels in the heat exchange device 8 arranged on both sides of the flow divider 82 in the third direction Z can exchange heat with the battery cell group 7 arranged on both sides of the heat exchange device 8 in the third direction Z, which is beneficial to improving the utilization rate and heat exchange efficiency of the heat exchange device 8 and reducing the heat exchange cost per unit area.

[0113] In some embodiments, reference Figure 11 The surface of the flow divider 82 facing the first plate 811 is recessed in a direction away from the first plate 811 to form a first flow channel groove 823. The first plate 811 is connected to the flow divider 82 and covers the first flow channel groove 823. The first plate 811 and the first flow channel groove 823 form a first heat exchange channel 84. Multiple first heat exchange channels 84 are arranged sequentially along the second direction Y to form one of the two sets of heat exchange channels that is closer to the first plate 811 in the third direction Z. The surface of the flow divider 82 facing the second plate 812 is recessed in a direction away from the second plate 812 to form a second flow channel groove 824. The second plate 812 is connected to the flow divider 82 and covers the second flow channel groove 824. The second plate 812 and the second flow channel groove 824 form a second heat exchange channel 85. Multiple second heat exchange channels 85 are arranged sequentially along the second direction Y to form one of the two sets of heat exchange channels that is farther away from the first plate 811 in the third direction Z.

[0114] The first flow channel groove 823 can be a groove structure formed on the surface of the flow divider plate 82 facing the first plate 811. The first flow channel groove 823 is formed by recessing the surface of the flow divider plate 82 facing the first plate 811 in a direction away from the first plate 811, so that the first plate 811, after being connected to the flow divider plate 82, can cover the first flow channel groove 823, allowing the first flow channel groove 823 and the first plate 811 to form a first heat exchange channel 84. The first heat exchange channel 84 can extend along a first direction X.

[0115] Multiple first flow channel grooves 823 are provided, and the multiple first flow channel grooves 823 are arranged sequentially along the second direction Y, so that the first plate 811 connected to the flow divider plate 82 can form multiple first heat exchange channels 84 arranged sequentially along the second direction Y. The multiple first heat exchange channels 84 form a heat exchange channel group that is closer to the first plate 811 in the third direction Z of the two sets of heat exchange channels.

[0116] For example, material can be removed from the surface of the manifold 82 facing the first plate 811 by machining such as milling, and the surface of the manifold 82 facing the first plate 811 can be recessed inward to form the first flow channel groove 823; or the surface of the manifold 82 facing the first plate 811 can be deformed inward by stamping process to form the first flow channel groove 823.

[0117] The second flow channel groove 824 can be a groove structure formed on the surface of the manifold 82 facing the second plate 812. The second flow channel groove 824 is formed by recessing the surface of the manifold 82 facing the second plate 812 in a direction away from the second plate 812, so that the second plate 812, after being connected to the manifold 82, can cover the second flow channel groove 824, allowing the second flow channel groove 824 and the second plate 812 to form a second heat exchange channel 85. The second heat exchange channel 85 can extend along the first direction X.

[0118] Multiple second flow channel slots 824 are provided, and the multiple second flow channel slots 824 are arranged sequentially along the second direction Y, so that the second plate 812 connected to the flow divider plate 82 can form multiple second heat exchange channels 85 arranged sequentially along the second direction Y. The multiple second heat exchange channels 85 form a heat exchange channel group that is closer to the second plate 812 in the third direction Z of the two sets of heat exchange channels.

[0119] For example, material can be removed from the surface of the manifold 82 facing the second plate 812 by machining such as milling, and the surface of the manifold 82 facing the second plate 812 can be recessed inward to form the second flow channel groove 824; or the surface of the manifold 82 facing the second plate 812 can be deformed inward by stamping process to form the second flow channel groove 824.

[0120] By directly covering the first plate 811 and the second plate 812 with the recessed flow channel groove of the flow divider plate 82 to form a heat exchange flow channel, the overall structure is simple and the processing and assembly difficulty is reduced. This structure can simultaneously adapt to two usage scenarios: heat exchange for a single battery cell group 7 and heat exchange between two battery cell groups 7. There is no need to design and process heat exchange devices 8 with different structures for different usage scenarios, which is conducive to the standardization of parts and reduces development and manufacturing costs. When the heat exchange device 8 is sandwiched between two battery cell groups 7, the flow divider plate 82 can be roughly located in the middle of the medium cavity 83 in the third direction Z. The number of the first flow channel groove 823 and the second flow channel groove 824 can be the same, so that the heat exchange medium is more evenly distributed in the two sets of heat exchange flow channels.

[0121] In some embodiments, the surface of the flow divider 82 facing away from the first plate 811 protrudes in a direction away from the first plate 811 to form a first protrusion structure 825, and along the third direction Z, the first flow channel groove 823 is disposed opposite to the first protrusion structure 825; the surface of the flow divider 82 facing away from the second plate 812 protrudes in a direction away from the second plate 812 to form a second protrusion structure 826, and along the third direction Z, the second flow channel groove 824 is disposed opposite to the second protrusion structure 826; in the second direction Y, the first flow channel groove 823 and the second flow channel groove 824 are alternately disposed.

[0122] By making the surface of the flow divider 82 facing away from the first plate 811 protrude in a direction away from the first plate 811 to form a first protrusion structure 825, and by making the first flow channel groove 823 opposite to the first protrusion structure 825 along the third direction Z, the first protrusion structure 825 can compensate for the reduction in thickness of the flow divider 82 caused by the formation of the first flow channel groove 823, which is beneficial to improving the structural strength of the flow divider 82 and reducing the possibility of damage to the flow divider 82.

[0123] By making the surface of the flow divider 82 facing away from the second plate 812 protrude in a direction away from the second plate 812 to form a second protrusion structure 826, and by making the second flow channel groove 824 opposite to the second protrusion structure 826 along the third direction Z, the second protrusion structure 826 can compensate for the reduction in thickness of the flow divider 82 caused by the formation of the second flow channel groove 824, which is beneficial to improving the structural strength of the flow divider 82 and reducing the possibility of damage to the flow divider 82.

[0124] By providing the first protrusion structure 825 and the second protrusion structure 826, the thickness of the manifold 82 with the first flow channel groove 823 and the second flow channel groove 824 can remain stable, allowing the manifold 82 to be manufactured by stamping, which helps to reduce the processing difficulty and cost of the manifold 82. For example, the stamped manifold 82 can be processed into the required shape by laser cutting.

[0125] In the second direction Y, the first flow channel groove 823 and the second flow channel groove 824 are alternately arranged. This means that along the second direction Y, the first flow channel groove 823 and the second flow channel groove 824 on the flow divider plate 82 appear alternately in sequence. This allows the first flow channel groove 823 and the second flow channel groove 824 to be staggered in the third direction Z, enabling the first flow channel groove 823 and the second flow channel groove 824 to be formed simultaneously on the flow divider plate 82 through a stamping process. In addition, the alternating arrangement is also beneficial to achieve uniform distribution of the heat exchange medium and improve the temperature uniformity of the battery cell group 7.

[0126] In some embodiments, reference Figures 12 to 15 As shown, the cross-sectional shape of the first flow channel groove 823 on the plane perpendicular to the first direction X is trapezoidal, rectangular, triangular or arc-shaped; the cross-sectional shape of the second flow channel groove 824 on the plane perpendicular to the first direction X is trapezoidal, rectangular, triangular or arc-shaped.

[0127] By setting the cross-sectional shape of the first flow channel groove 823 on a plane perpendicular to the first direction X to be trapezoidal, rectangular, triangular or arc-shaped, the first heat exchange flow channel 84 formed by the first flow channel groove 823 and the first plate 811 can be a trapezoidal flow channel, rectangular flow channel, triangular flow channel or arc-shaped flow channel. Those skilled in the art can choose according to the actual situation.

[0128] By setting the cross-sectional shape of the second flow channel groove 824 on the plane perpendicular to the first direction X to be trapezoidal, rectangular, triangular or arc-shaped, the second heat exchange flow channel 85 formed by the second flow channel groove 824 and the second plate 812 can be a trapezoidal flow channel, rectangular flow channel, triangular flow channel or arc-shaped flow channel. Those skilled in the art can choose according to the actual situation.

[0129] In some embodiments, continue to refer to Figure 3 In the extension direction of the heat exchange channel, the two ends of the flow divider plate 82 are spaced apart from the two ends of the inner surface of the medium cavity 83 to form a guide cavity 86, which is connected to multiple heat exchange channels; the heat exchange device 8 is provided with a heat exchange interface 9 for introducing heat exchange medium, which is connected to the guide cavity 86.

[0130] The guide cavity 86 can be a cavity structure used to enable the heat exchange medium to flow synchronously into multiple heat exchange channels or to enable the heat exchange medium in multiple heat exchange channels to flow synchronously back. By spaced apart at both ends of the flow divider 82 in the extension direction of the heat exchange channels and at both ends of the inner surface of the medium cavity 83 in the extension direction of the heat exchange channels, guide cavities 86 communicating with multiple heat exchange channels are formed on both sides of the flow divider 82 in the extension direction of the heat exchange channels, so that the heat exchange medium can be synchronously circulated into multiple heat exchange channels. For example, the heat exchange channels can all extend along the first direction X, and the flow divider 82 has guide cavities 86 formed on both sides of the first direction X.

[0131] The heat exchange interface 9 may include an inlet and an outlet, which are arranged opposite to each other along a first direction X. A heat exchange flow channel is disposed between the inlet and the outlet. The inlet allows the heat exchange medium to enter the guide cavity 86 of the heat exchange device 8, and the outlet allows the heat exchange medium in the guide cavity 86 of the heat exchange device 8 to flow out. By configuring the heat exchange flow channel to extend along the first direction X, the heat exchange medium flowing between the inlet and the outlet, which are arranged opposite to each other along the first direction X, has a small flow resistance.

[0132] In some embodiments, at least two media cavities 83 are provided, and the at least two media cavities 83 are spaced apart along a direction intersecting the extension direction of the heat exchange channel.

[0133] By providing at least two medium cavities 83 and arranging them sequentially at intervals along a direction intersecting the extension direction of the heat exchange channel, the at least two medium cavities 83 can be distributed over a larger area of ​​the heat exchange device 8, which is beneficial for improving the heat exchange efficiency between the heat exchange device 8 and the battery cell assembly 7. For example, the at least two medium cavities 83 can be spaced apart along the second direction Y, and each medium cavity can contain a flow divider 82. The heat exchange channel formed by the flow divider 82 and the medium cavity 83 can extend along the first direction X.

[0134] For example, in a plane perpendicular to the third direction Z, the orthographic projection of each medium cavity 83 coincides with the orthographic projection of a battery cell group 7, such that one medium cavity 83 is correspondingly arranged with one battery cell group 7, and the heat exchange medium flowing through the medium cavity 83 can remove the heat generated on the battery cell group 7. In some embodiments, in a plane perpendicular to the third direction Z, the orthographic projection of each medium cavity 83 coincides with the orthographic projection of two battery cell groups 7 spaced apart in the third direction Z, such that one medium cavity 83 is correspondingly arranged with two battery cell groups 7, and the heat exchange medium flowing through the medium cavity 83 can remove the heat generated by two adjacent battery cell groups 7 in the third direction Z.

[0135] In some embodiments, the substrate material of the protective layer 822 is magnesium or zinc, and the substrate material of the main structure 81 is copper, aluminum or iron.

[0136] The substrate material of the protective layer 822 can refer to the material with the largest mass proportion in the protective layer 822. The substrate material of the main structure 81 can refer to the material with the largest mass proportion in the main structure 81.

[0137] In some examples, the substrate material of the protective layer 822 is magnesium, and the substrate material of the main structure 81 is copper, aluminum, or iron. In other examples, the substrate material of the protective layer 822 is zinc, and the substrate material of the main structure 81 is copper or iron. The protective layer 822 is made of magnesium or zinc, both of which have low potentials and high chemical activity, allowing them to be preferentially corroded as sacrificial anodes. Magnesium also has a low density, which is beneficial for lightweight design, while zinc has a stable corrosion rate, low cost, and a long protection period. The main structure 81 is made of copper, aluminum, or iron, which have relatively high potentials and good corrosion resistance. Aluminum combines the advantages of low density and high thermal conductivity, copper has excellent thermal conductivity and outstanding heat exchange efficiency, and iron has good structural strength and rigidity. This material combination enables the heat exchange device 8 to achieve efficient corrosion protection while also considering good heat exchange performance, structural strength, lightweight design, and processing economy, thus meeting the usage requirements of the battery device 2.

[0138] With the above configuration, the potential of the protective layer 822 is lower than that of the main structure 81, which allows the protective layer 822 to be preferentially corroded as an anode, while the main structure 81 can be protected as a cathode and is not easily corroded. This makes the inner wall of the heat exchange channel less susceptible to corrosion, improves the durability and reliability of the heat exchange device 8, and helps to improve the reliability of the battery device 2.

[0139] For example, the main body layer 821 and the main structure 81 can be made of 3-series aluminum such as AL3003, and the protective layer 822 can be made of 4-series aluminum such as AL4343, AL4045, and AL4047, 4-series aluminum with added magnesium equipotential material, or 7-series aluminum such as AL7072. In other embodiments, the main body layer 821 and the main structure 81 can be made of 4-series aluminum such as AL4343, AL4045, and AL4047, and the protective layer 822 can be made of 4-series aluminum with added magnesium equipotential material or 7-series aluminum such as AL7072. The main body layer 821 and the protective layer 822 can be composited using cold rolling or hot rolling processes to form the flow divider 82. For example, the composite ratio of the protective layer 822 can be in the range of 5% to 25%.

[0140] Some embodiments of this application also provide an electrical device, which includes a battery device 2 provided by any of the above technical solutions, the battery device 2 being used to provide electrical energy.

[0141] The battery device 2 provided in this application embodiment includes a housing 5, a battery cell group 7, and a heat exchange device 8. The battery cell group 7 is disposed in the housing 5. The heat exchange device 8 is disposed in the housing 5 and includes a first plate 811, a second plate 812, and a flow divider 82. The first plate 811 and the second plate 812 are stacked to form a medium cavity 83. The flow divider 82 is disposed in the medium cavity 83. The flow divider 82 includes a main layer 821 and a protective layer 822. The main layer 821 includes a first surface 8211 and a second surface 8212 disposed opposite to each other along the thickness direction of the flow divider 82. The first surface 8211 and the second surface 8212 are both covered with the protective layer 822. The potential of the protective layer 822 is lower than the potential of the main structure 81. The flow divider 82 divides the medium cavity 83 into two sets of heat exchange channels. One set of heat exchange channels includes multiple first heat exchange channels 84 arranged sequentially along the second direction Y, and the other set of heat exchange channels includes multiple second heat exchange channels 85 arranged sequentially along the second direction Y. The first heat exchange channels 84 are formed by first channel grooves 823 formed by the inner surface of the first plate 811 and the surface of the flow divider 82 facing the first plate 811. The second heat exchange channels 85 are formed by the inner surface of the second plate 812 and second channel grooves 824 formed by the inner surface of the second plate 812 and the surface of the flow divider 82 facing the second plate 812. One of two adjacent battery cell groups 7 is attached to the first plate 811, and the other is attached to the second plate 812.

[0142] Since multiple heat exchange channels are formed by the flow divider plate 82 disposed in the medium cavity 83 and the inner wall surface of the medium cavity 83, the heat exchange channels do not need to be directly stamped to form complex multiple heat exchange channels during the forming process. Instead, the medium cavity 83 is directly stamped, and then the flow divider plate 82 is disposed in the medium cavity 83, which reduces the processing difficulty of the heat exchange channels. In the above structure, since the first surface 8211 and the second surface 8212 of the main body layer 821 in the flow divider plate 82 are both covered with a protective layer 822, and the potential of the protective layer 822 is lower than that of the main structure 81, the lower potential of the protective layer 822 can act as an anode and be preferentially corroded, while the main structure 81 can act as a cathode and be protected from corrosion. This makes the wall surface of the medium cavity surrounded by the main structure less susceptible to corrosion, improving the durability and reliability of the heat exchange device 8, and thus improving the reliability of the battery device 2.

[0143] 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; A battery cell assembly is disposed within the housing; A heat exchange device is disposed in the housing. The heat exchange device includes a main structure and a flow divider. A medium cavity is formed in the main structure. The flow divider is disposed in the medium cavity. The flow divider and the inner wall of the medium cavity form a heat exchange channel. The flow divider includes a main layer and a protective layer. The main layer includes a first surface and a second surface disposed opposite to each other along the thickness direction of the flow divider. At least one of the first surface and the second surface is covered by the protective layer. The potential of the protective layer is lower than that of the main structure.

2. The battery device according to claim 1, characterized in that, The heat exchange channels are provided in multiple ways, each extending along a first direction, and the multiple heat exchange channels are arranged sequentially along a second direction, which intersects with the first direction.

3. The battery device according to claim 2, characterized in that, The main structure includes a first plate and a second plate stacked along a third direction. The third direction, the second direction, and the first direction intersect each other but are not coplanar. The surface of the first plate facing the second plate is recessed in a direction away from the second plate to form a first groove. The surface of the second plate facing the first plate is recessed in a direction away from the first plate to form a second groove. The second groove and the first groove are connected to form the medium cavity.

4. The battery device according to claim 3, characterized in that, The surface of the first plate facing away from the second plate protrudes in a direction away from the second plate to form a first protrusion. Along the third direction, the first groove is disposed opposite to the first protrusion. The second plate has a second protrusion formed on the surface of the second plate away from the first plate in a direction away from the first plate. Along the third direction, the second groove is disposed opposite to the second protrusion.

5. The battery device according to claim 3, characterized in that, In a plane perpendicular to the third direction, the orthographic projection of the first groove coincides with the orthographic projection of the second groove.

6. The battery device according to claim 3, characterized in that, The heat exchange channels are divided into two groups, and each group of heat exchange channels includes multiple heat exchange channels arranged sequentially along the second direction. The two groups of heat exchange channels are respectively disposed on both sides of the flow divider plate in the third direction. The battery cell group includes at least two, and the at least two battery cell groups are arranged along the third direction. The heat exchange device is provided between two adjacent battery cell groups. One of the two adjacent battery cell groups is attached to the first plate and the other is attached to the second plate.

7. The battery device according to any one of claims 3-6, characterized in that, The surface of the flow divider facing the first plate is recessed in a direction away from the first plate to form a first flow channel groove. The first plate is connected to the flow divider and covers the first flow channel groove. The first plate and the first flow channel groove form a first heat exchange channel. A plurality of the first heat exchange channels are arranged sequentially along the second direction to form one of the two sets of heat exchange channels that is closer to the first plate in the third direction. The surface of the flow divider facing the second plate is recessed in a direction away from the second plate to form a second flow channel groove. The second plate is connected to the flow divider and covers the second flow channel groove. The second plate and the second flow channel groove form a second heat exchange channel. Multiple second heat exchange channels are arranged sequentially along the second direction to form one of the two sets of heat exchange channels that are away from the first plate in the third direction.

8. The battery device according to claim 7, characterized in that, The surface of the flow divider facing away from the first plate protrudes in a direction away from the first plate to form a first protrusion structure. Along the third direction, the first flow channel groove is disposed opposite to the first protrusion structure. The surface of the flow divider facing away from the second plate protrudes in a direction away from the second plate to form a second protrusion structure. Along the third direction, the second flow channel groove is disposed opposite to the second protrusion structure. In the second direction, the first flow channel groove and the second flow channel groove are alternately disposed.

9. The battery device according to claim 7, characterized in that, The cross-sectional shape of the first flow channel groove on the plane perpendicular to the first direction is trapezoidal, rectangular, triangular or arc-shaped; the cross-sectional shape of the second flow channel groove on the plane perpendicular to the first direction is trapezoidal, rectangular, triangular or arc-shaped.

10. The battery device according to claim 1, characterized in that, In the extension direction of the heat exchange channel, the two ends of the flow divider plate are spaced apart from the two ends of the inner surface of the medium cavity to form a guide cavity, and the guide cavity is connected to the multiple heat exchange channels; the heat exchange device is provided with a heat exchange interface, and the heat exchange interface is connected to the guide cavity.

11. The battery device according to claim 1, characterized in that, At least two media cavities are provided, and the at least two media cavities are spaced apart along a direction that intersects the extension direction of the heat exchange channel.

12. The battery device according to claim 1, characterized in that, The base material of the protective layer is magnesium or zinc, and the base material of the main structure is copper, aluminum or iron.

13. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-12, the battery device being used to provide electrical energy.

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