Battery device and electric device

Abstract

The application discloses a battery device and an electric device. The battery device comprises a battery monomer assembly and a heat management assembly. The battery monomer assembly comprises a plurality of battery monomers arranged along a first direction. The heat management assembly comprises a connecting plate part and an intermediate heat exchange plate part connected with the connecting plate part. The intermediate heat exchange plate part extends along the first direction and is arranged on one side of the battery monomer assembly along a second direction to exchange heat with the plurality of battery monomers arranged along the first direction. The intermediate heat exchange plate part is formed with a heat exchange flow channel. The connecting plate part comprises a first layer plate and a second layer plate stacked along the second direction. A first flow channel is formed between the first layer plate and the second layer plate. The heat management assembly further comprises a third layer plate stacked along the second direction with the connecting plate part and formed with a second flow channel. The first flow channel and the second flow channel are respectively communicated with an inlet and an outlet, and the first flow channel and the second flow channel are communicated through the heat exchange flow channel.

Description

Technical Field

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

[0002] With the continuous development of new energy technologies, batteries are increasingly being used in new energy vehicles, energy storage systems, and other fields. A battery integrates multiple individual cells, which generate a large amount of heat during charging and discharging, potentially leading to adverse reactions such as thermal runaway.

[0003] Therefore, it is necessary to design the battery for heat dissipation to improve battery safety. Utility Model Content

[0004] This application provides a battery device and an electrical device. The battery device can improve heat exchange efficiency by achieving unidirectional flow of heat exchange medium through the structural design of the thermal management component. Furthermore, the thermal management component adopts a plate form to reduce installation space requirements, which helps to improve the energy density of the battery device.

[0005] In a first aspect, this application provides a battery device, which includes a battery cell assembly and a thermal management assembly. The battery cell assembly includes a plurality of battery cells arranged along a first direction. The thermal management assembly has an inlet and an outlet. The thermal management assembly also includes a connecting plate portion and an intermediate heat exchange plate portion connected to the connecting plate portion. The intermediate heat exchange plate portion extends along the first direction and is disposed on one side of the battery cell assembly along a second direction to exchange heat with the plurality of battery cells arranged along the first direction. The intermediate heat exchange plate portion forms a heat exchange channel. The connecting plate portion includes a first plate and a second plate stacked along the second direction. A first channel is formed between the first plate and the second plate. The first channel is used to communicate with the inlet. The first direction and the second direction are intersected. The thermal management assembly also includes a third plate. The third plate is stacked with the connecting plate portion along the second direction and forms a second channel. The second channel is used to communicate with the outlet. The first channel and the second channel are connected through the heat exchange channel.

[0006] According to the battery device provided in the first aspect of this application, the thermal management component includes a connecting plate and an intermediate heat exchange plate. The connecting plate has a first flow channel through which the heat exchange medium can flow to the intermediate heat exchange plate to exchange heat with the battery cells, thereby improving heat exchange efficiency. The thermal management component also includes a third plate, with a second flow channel formed between the third plate and the connecting plate. The second flow channel collects the heat exchanged medium flowing out of the intermediate heat exchange plate and discharges it through an outlet. The first and second flow channels are connected through the heat exchange channel formed in the intermediate heat exchange plate to achieve unidirectional flow of the heat exchange medium, allowing unexchanged medium to continuously flow within the heat exchange channel, thus improving the heat exchange efficiency between the thermal management component and the battery cells. Furthermore, the connecting plate and the third plate are designed as three plates stacked in the second direction, reducing the space occupied by the thermal management component within the battery device and contributing to further improvement of the battery device's energy density.

[0007] In some optional embodiments, there are multiple battery cell assemblies, which are arranged along a third direction. The third direction is intersected with the first and second directions. The projection of the intermediate heat exchange plate along the second direction covers at least a portion of the adjacent battery cell assemblies to exchange heat with the adjacent battery cell assemblies.

[0008] In the above optional embodiments, the intermediate heat exchange plate is positioned corresponding to the shoulder of the battery cell to avoid obstructing structures such as the pressure relief valve on the top of the battery cell. Furthermore, one intermediate heat exchange plate can exchange heat with the shoulder positions of two battery cell assemblies, thereby improving the heat exchange efficiency between the thermal management assembly and the battery cell assemblies.

[0009] In some optional embodiments, multiple intermediate heat exchange plates are provided, each with an inlet channel and an outlet channel. The heat exchange medium in the inlet channel flows away from the connecting plate, while the heat exchange medium in the outlet channel flows towards the connecting plate. The inlet channel is connected to the first channel, and a first hole is provided on the side of the intermediate heat exchange plate near the third layer to connect the outlet channel and the second channel.

[0010] In the above optional embodiments, multiple intermediate heat exchange plates can be correspondingly arranged with multiple battery cell modules. Some battery cell modules can exchange heat with two intermediate heat exchange plates respectively through two shoulder sections arranged along a third direction, further improving the heat exchange efficiency between the thermal management component and the battery cell module. Furthermore, the intermediate heat exchange plates further guide the flow direction of the heat exchange medium through inlet and outlet channels.

[0011] In some optional embodiments, the thermal management component further includes a first end heat exchange plate portion connected to the connecting plate portion, an inlet being opened at the end of the first end heat exchange plate portion away from the connecting plate portion, the first end heat exchange plate portion being disposed on one side of a plurality of intermediate heat exchange plates portions along a third direction, the first end heat exchange plate portion forming a first unidirectional flow channel, and the inlet being connected to the first flow channel through the first unidirectional flow channel.

[0012] In the above optional embodiments, by providing a first end heat exchange plate, the heat exchange medium can be supplied to the first flow channel through the liquid inlet and the first unidirectional flow channel, and then diverted to different heat exchange channels through the first flow channel to achieve heat exchange for individual battery cell modules. The first end heat exchange plate can also be provided for battery cell modules located at the edge along a third direction among multiple battery cell modules, and achieve heat exchange with the shoulders of each battery cell in the battery cell module. Furthermore, the first end heat exchange plate can be used to separate the liquid inlet from the first flow channel and the second flow channel, reducing the size of the thermal management component in the second direction and reducing the installation space requirements of the thermal management component within the battery device.

[0013] In some optional embodiments, the first plate is recessed in the direction away from the second plate to form a first recess, the second plate is recessed in the direction away from the first plate to form a second recess, a first flow cavity is formed between the first recess and the second recess, and the first unidirectional flow channel is connected to the first flow channel through the first flow cavity.

[0014] In the above optional embodiments, compared with the first flow channel, the first flow cavity formed between the first recess and the second recess has a larger flow channel cross-sectional area, thus having a stronger flow capacity, which can reduce the flow resistance of the first unidirectional flow channel to the first flow channel and accelerate the flow of the heat exchange medium.

[0015] In some optional embodiments, the thermal management component further includes a second end heat exchange plate portion connected to the connecting plate portion, with the liquid outlet located at the end of the second end heat exchange plate portion away from the connecting plate portion. The second end heat exchange plate portion is disposed on the side of a plurality of intermediate heat exchange plate portions that is opposite to the first end heat exchange plate portion in a third direction. The second end heat exchange plate portion forms a second unidirectional flow channel, which flows in the opposite direction to the first unidirectional flow channel. The second flow channel is connected to the liquid outlet through the second unidirectional flow channel.

[0016] In the above optional embodiments, by providing a second end heat exchange plate, the heat-exchanged medium can flow out of the thermal management component through the second unidirectional flow channel and the outlet for collection. During its flow within the second unidirectional flow channel, the heat-exchanged medium can also exchange heat with the shoulders of individual battery cells in the battery cell assembly located on the other side along a third direction, fully utilizing the heat exchange medium. Furthermore, the second end heat exchange plate can also be used to separate the outlet from the first and second flow channels, reducing the size of the thermal management component in the second direction and lowering the installation space requirements of the thermal management component within the battery device.

[0017] In some alternative embodiments, among the plurality of intermediate heat exchange plate sections, the intermediate heat exchange plate section farther from the first end heat exchange plate section is connected to the second unidirectional flow channel through the liquid outlet flow channel.

[0018] In the above optional embodiments, after the heat exchange medium in the heat exchange channel near the second end heat exchange plate has completed heat exchange, it can flow directly from the connecting plate to the second unidirectional flow channel without having to flow through the second flow channel again, thereby reducing the flow resistance of this part of the heat exchanged medium and accelerating the flow of the heat exchange medium in the thermal management component.

[0019] In some optional embodiments, a second flow cavity is formed in the second end heat exchange plate portion. The second flow cavity is disposed at one end of the second end heat exchange plate portion used to connect to the connecting plate portion, and the second flow channel is connected to the second unidirectional flow channel through the second flow cavity.

[0020] In the above optional embodiments, the second flow cavity can merge the heat exchange channel near the second end heat exchange plate and the heat exchanged medium flowing in the second channel and guide it to flow into the second channel and finally flow out of the heat management component through the liquid outlet, thereby reducing the thermal resistance between the second channel and the second unidirectional channel and accelerating the flow of the heat exchanged medium to the liquid outlet.

[0021] In some optional embodiments, the liquid inlet and liquid outlet are located on the side of the connecting plate portion away from the third layer plate, and the liquid inlet and liquid outlet are respectively located on both sides of the connecting plate portion along the third direction.

[0022] In the above optional embodiments, the inlet is directly connected to the first flow channel to supply the heat exchange medium, and the second flow channel is connected to the outlet to collect the heat exchanged medium. The connecting plate and the third plate are connected to the flow path between the inlet and outlet, improving heat exchange efficiency. Furthermore, the temperature of the heat exchange medium at the inlet of each intermediate heat exchange plate and the temperature of the heat exchanged medium at the outlet tend to be consistent, and the heat exchange efficiency of each battery cell component in the battery device tends to be the same, which helps to suppress the occurrence of local hot spots in the battery device.

[0023] In some alternative embodiments, the third layer plate is disposed on the side of the connecting plate portion away from the battery cell assembly, and the second flow channel is connected to the liquid outlet through the liquid outlet flow channel of one of the intermediate heat exchange plates.

[0024] In the above optional embodiments, the second flow channel is separated from the inlet and outlet along the second direction to form a clearance, so that the second flow channel can communicate with each intermediate heat exchange plate to collect the heat exchanged medium in each heat exchange channel. Furthermore, the second flow channel and the outlet can be connected through the outlet flow channel of one of the heat exchange channels to discharge the collected heat exchanged medium from the thermal management component.

[0025] In some optional embodiments, in the plurality of intermediate heat exchange plate sections, the liquid inlet channel includes at least two liquid inlet sub-channels, the liquid outlet channel includes at least two liquid outlet sub-channels, and the liquid inlet sub-channels and the liquid outlet sub-channels are connected in a one-to-one correspondence.

[0026] In the above optional embodiments, the heat exchange medium flowing in each intermediate heat exchange plate section is diverted, which accelerates the flow of the heat exchange medium and improves the heat exchange efficiency.

[0027] In some optional embodiments, the intermediate heat exchange plate includes a sealing plate and a flow channel plate connected together. The flow channel plate is disposed on the side of the sealing plate away from the battery cell assembly. The wall surface of the sealing plate facing the battery cell assembly is flat. At least a portion of the flow channel plate is recessed in the direction away from the battery cell assembly to form a heat exchange flow channel.

[0028] In the above optional embodiments, the intermediate heat exchange plate contacts the battery cell assembly for heat exchange through the plane of the sealing plate, increasing the heat exchange area to improve the heat exchange efficiency between the battery cell assembly and the thermal management assembly. Furthermore, the sealing plate is easy to process and shape, requiring lower alignment accuracy when installing onto the battery cell assembly, and saving assembly time for the thermal management assembly.

[0029] In some alternative embodiments, the sealing plate is bonded to the flow channel plate, or the sealing plate is brazed to the flow channel plate.

[0030] In the above optional embodiments, it is convenient to seal and fix the sealing plate and the flow channel plate to form a heat exchange flow channel for the heat exchange medium to circulate, so as to realize the heat exchange between the thermal management component and the battery cell component.

[0031] In some alternative embodiments, the runner plate is a stamped part.

[0032] In the above optional embodiments, the flow channel plate is easy to process, so that the flow channel plate can form a heat exchange channel under the sealing effect of the sealing plate.

[0033] In some alternative embodiments, the sealing plate and the first layer plate are integrally formed, and / or the flow channel plate and the second layer plate are integrally formed.

[0034] In the above optional embodiments, the intermediate heat exchange plate portion can be manufactured and formed simultaneously with the connecting plate portion, which reduces the production cost and assembly difficulty of the thermal management components and battery devices.

[0035] In some alternative embodiments, the first layer is a flat plate, and at least a portion of the second layer is recessed toward the direction away from the battery cell assembly to form a first flow channel.

[0036] In the above optional embodiments, the first flow channel and the battery cell assembly are separated in the second direction, so that the energy density of the battery device has greater room for improvement.

[0037] In some alternative embodiments, the third layer is a stamped part, and / or the second layer is a stamped part.

[0038] In the above optional embodiments, the connecting plate or the third layer plate is easier to process and can directly form the first flow channel or the second flow channel during the stamping process.

[0039] In some alternative embodiments, the battery device further includes a housing assembly for housing the battery cell assembly, the housing assembly including a housing body and a first limiting beam disposed in the housing body along a third direction, with one end of the intermediate heat exchange plate portion away from the connecting plate portion connected to the first limiting beam.

[0040] In the above optional embodiments, the thermal management component can be relatively fixed with the housing component and the battery cell component through the connection between the intermediate heat exchange plate and the first limiting beam, thereby improving the heat exchange stability of the battery cell component.

[0041] In some optional embodiments, the housing assembly further includes a second limiting beam extending along a third direction, the second limiting beam and the first limiting beam being disposed at both ends of the battery cell assembly along a first direction, and the end of the intermediate heat exchange plate portion near the connecting plate portion being connected to the second limiting beam.

[0042] In the above optional embodiments, the two ends of the thermal management component along the first direction are respectively connected and fixed to the first limiting beam and the second limiting beam, which improves the connection strength between the thermal management component and the housing component while restricting the movement of the thermal management component along the first direction, so as to avoid the situation where the middle heat exchange plate is heated and warped, thus preventing contact heat exchange from being achieved.

[0043] In some alternative embodiments, the thermal management assembly further includes a reinforcing plate connected to the second limiting beam, the reinforcing plate being located on the side of the intermediate heat exchange plate portion away from the second limiting beam.

[0044] In the above optional embodiments, the reinforcing plate and the second limiting beam can respectively apply constraints from both ends of the intermediate heat exchange plate section along the first direction to further improve the connection stability of the intermediate heat exchange plate section and the thermal management components in the box.

[0045] In some alternative embodiments, a relief groove is formed at one end of the intermediate heat exchange plate portion near the connecting plate portion, and the opening of the relief groove is disposed away from the second limiting beam to accommodate at least part of the reinforcing plate.

[0046] In the above optional embodiments, the arrangement of the clearance groove can further compress the size of the thermal management component in the second direction, reduce the installation space requirements of the thermal management component, and help improve the energy density of the battery device.

[0047] In some alternative embodiments, the reinforcing plate is bonded to the intermediate heat exchange plate, or the reinforcing plate is welded to the intermediate heat exchange plate, or the reinforcing plate is bolted to the intermediate heat exchange plate and the second limiting beam.

[0048] In the above optional embodiments, the reinforcing plate is fixedly connected to the intermediate heat exchange plate portion to constrain the deformation and warping of the intermediate heat exchange plate portion in the second direction.

[0049] In some optional embodiments, the battery device further includes a high-voltage box electrically connected to the battery cell assembly, with the high-voltage box and the connecting plate portion disposed on opposite sides of the battery cell assembly along a first direction.

[0050] In the above optional embodiments, the high-voltage box can be used to distribute power among the individual battery cells within the battery device, thereby improving the energy utilization efficiency of the battery device. Furthermore, the design of the high-voltage box and connecting plate located on both sides of the battery cell assembly helps to reduce the size of the battery device in the second direction.

[0051] Secondly, embodiments of this application provide an electrical device, which includes the battery device provided in any embodiment of the first aspect. Attached Figure Description

[0052] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0053] Figure 1 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery cell assembly according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application; Figure 5 This is an exploded view of a battery device according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a thermal management component according to an embodiment of this application; Figure 7 for Figure 6 The diagram shows the assembly of the thermal management component and the battery cell assembly. Figure 8 for Figure 6 An exploded view of the thermal management component shown. Figure 9 for Figure 8 Enlarged structural diagram at point A; Figure 10 for Figure 6 A schematic diagram showing the connection between the connecting plate and the third layer plate in the thermal management assembly shown. Figure 11 This is a schematic diagram of the structure of a thermal management component according to another embodiment of this application; Figure 12 for Figure 10 An exploded view of the thermal management component shown. Figure 13 for Figure 10 A schematic diagram showing the connection between the connecting plate and the third layer plate in the thermal management assembly shown. Figure 14 This is a schematic diagram of the structure of a thermal management component according to another embodiment of this application; Figure 15 for Figure 14 The diagram shows the assembly of the thermal management component and the battery cell assembly. Figure 16 for Figure 14 An exploded view of the thermal management component shown. Figure 17 This is a schematic diagram of the structure of a battery device according to another embodiment of this application.

[0054] The accompanying drawings are not necessarily drawn to scale.

[0055] The specific marking information in the attached diagram is as follows: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Top cover; 20. Battery cell assembly; 21. Battery cell; 211. Housing; 212. End cap; 213. Electrode assembly; 214. Electrode terminal; 30. Housing; 40. Thermal management component; 401. Liquid inlet; 402. Liquid outlet; 41. Connecting plate; 411. First layer plate; 412. Second layer plate; 413. First flow channel; 42. Intermediate heat exchange plate; 4201. First hole; 421. Sealing plate; 422. Flow channel plate; 423. Heat exchange flow channel; 4231. Liquid inlet flow channel; 42311. Liquid inlet sub-flow channel; 4232. Liquid outlet flow channel; 42321. Liquid outlet sub-flow channel; 424. Clearance groove; 43. Third layer plate; 431. Second flow channel; 432. Extension; 44. First end heat exchange plate; 441. First one-way flow channel; 442. First flow cavity; 45. Second end heat exchange plate; 451. Second one-way flow channel; 452. Second flow cavity; 46. Reinforcing plate; 47. End plate; 50. Box assembly; 51. Box body; 52. First limiting beam; 53. Second limiting beam; 54. Box cover; 60. High-voltage box; First direction Y; second direction Z; third direction X. Detailed Implementation

[0056] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0058] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0059] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0060] In this application, "multiple" means two or more (including two).

[0061] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0062] The battery mentioned in the embodiments of this application may be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0063] In some embodiments, the battery can be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0064] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0065] 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.

[0066] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0068] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0069] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0070] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of silver-treated stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0072] In some embodiments, the positive electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0073] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-surfaced stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0076] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0077] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0078] In some embodiments, the negative electrode can be made of foamed carbon or foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0079] As an example, lithium source material, potassium metal or sodium metal may also be filled or deposited in the negative electrode current collector, wherein the lithium source material is lithium metal and / or lithium-rich material.

[0080] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0081] In some embodiments, the electrode assembly further includes a separator disposed between the positive and negative electrodes. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0082] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0083] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0085] In some implementations, the electrode assembly is a stacked structure.

[0086] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0091] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0092] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] The battery device also includes a thermal management component, which exchanges heat with the multiple individual battery cells within the device to ensure they operate under suitable temperature conditions. In related technologies, thermal management components typically connect multiple flow channels via pipe-like joints to facilitate the flow of the heat exchange medium. However, as the number of integrated battery cells increases, the flow channel connections in the thermal management component become complex and difficult to assemble, while also occupying a significant amount of internal space and hindering further improvements in the battery's energy density.

[0094] To address the aforementioned technical problems, this application provides a battery device and an electrical device. The battery device includes a battery cell assembly and a thermal management assembly. The thermal management assembly forms a first flow channel for a heat exchange medium to flow and a second flow channel for a heat-exchanged medium to flow through a first, second, and third layer stacked along the height of the battery cells. The first and second flow channels are connected by at least one heat exchange channel, which extends and exchanges heat with multiple battery cells in the battery cell assembly. In this application embodiment, the thermal management assembly forms the flow channels through a plate structure without the need for pipe connections, saving installation space within the battery device, especially in the second direction, and contributing to further improvement in the energy density of the battery device.

[0095] The technical solutions described in the embodiments of this application are applicable to electrode assemblies, battery cells including electrode assemblies, batteries including battery cells, and electrical devices using batteries.

[0096] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. 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. This application does not impose any special limitations on the above-mentioned electrical devices.

[0097] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0098] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 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. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 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 the vehicle 1000 during starting, navigation, and driving.

[0099] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] Please refer to Figure 2 , Figure 2This is an exploded view of the apparatus provided in some embodiments of this application. The battery device 100 includes a battery housing and a battery cell assembly 20. In some embodiments, the battery housing may include a top cover 10 and a housing 30, with the top cover 10 and the housing 30 covering each other, and the top cover 10 and the housing 30 together defining a receiving cavity for accommodating the battery cell assembly 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and the housing 30 together define the receiving cavity; the top cover 10 and the housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing formed by the top cover 10 and the housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0101] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application. The battery cell assembly 20 includes multiple battery cells 21, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 21 are connected in series and others in parallel. The multiple battery cells 21 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 21 is housed in a casing. Alternatively, the battery device 100 can also be formed by first connecting multiple battery cells 21 in series, parallel, or in a mixed configuration to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed configuration to form a whole, which is then housed in a casing. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing electrical connections between the multiple battery cells 21.

[0102] Each battery cell 21 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes.

[0103] Figure 4This is an exploded structural diagram of a battery cell according to some embodiments of this application. The end cap 212 is a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 21 from the external environment. Not limited to this, the shape of the end cap 212 can be adapted to the shape of the housing 211 to fit it. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 212 is less prone to deformation under pressure and impact, enabling the battery cell 21 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on the end cap 212. The electrode terminals 214 can be used for electrical connection with the electrode assembly 213 for outputting or inputting electrical energy from the battery cell 21. In some embodiments, the end cap 212 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The end cap 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 212. The insulating element can be used to isolate the electrical connection components in the housing 211 from the end cap 212 to reduce the risk of short circuit. For example, the insulating element can be plastic, rubber, etc.

[0104] Please see Figures 5 to 17 A first aspect of this application provides a battery device 100, which includes a battery cell assembly 20 and a thermal management assembly 40. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a first direction. The thermal management assembly 40 has an inlet 401 and an outlet 402. The thermal management assembly 40 also includes a connecting plate portion 41 and an intermediate heat exchange plate portion 42 connected to the connecting plate portion 41. The intermediate heat exchange plate portion 42 extends along the first direction and is disposed on one side of the battery cell assembly 20 along a second direction to exchange heat with the plurality of battery cells 21 arranged along the first direction. The intermediate heat exchange plate portion 42 is shaped as follows: The heat management component 40 includes a heat exchange channel 423. The connecting plate portion 41 includes a first plate 411 and a second plate 412 stacked along a second direction. A first channel 413 is formed between the first plate 411 and the second plate 412. The first channel 413 is used to communicate with the liquid inlet 401. The first direction and the second direction are arranged intersectingly. The heat management component 40 also includes a third plate 43. The third plate 43 is stacked with the connecting plate portion 41 along the second direction and forms a second channel 431. The second channel 431 is used to communicate with the liquid outlet 402. The first channel 413 and the second channel 431 are connected through the heat exchange channel 423.

[0105] For example, the first direction can be the thickness direction of the battery cell 21, and the second direction can be the height direction of the battery cell 21. The following embodiments may also involve a third direction, which can be the width direction of the battery cell 21, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0106] There can be one or more battery cell modules 20. For example, multiple battery cell modules 20 are arranged sequentially along a third direction.

[0107] Optionally, to ensure sufficient flow of the heat exchange medium within the thermal management component 40, the inlet 401 and outlet 402 of the thermal management component 40 are spaced apart along a third direction. The inlet 401 and outlet 402 may be located on the same side of the thermal management component 40 along the first direction, or they may be located on opposite sides of the thermal management component 40 along the first direction.

[0108] Specifically, the side of the connecting plate 41 facing the battery cell assembly 20 is the first layer plate 411, and the side facing away from the battery cell assembly 20 is the second layer plate 412. The first flow channel 413 is formed on the side of the first layer plate 411 facing away from the battery cell assembly 20.

[0109] Optionally, a third layer plate 43 is disposed on the side of the connecting plate portion 41 facing the battery cell assembly 20. The third layer plate 43 and the first layer plate 411 together define a second flow channel 431, which is formed on the side of the first layer plate 411 facing the battery cell assembly 20.

[0110] Optionally, the intermediate heat exchange plate portion 42 contacts the end cap 212 of the battery cell 21 to achieve heat exchange, or the intermediate heat exchange plate portion 42 contacts the side of the housing 211 of the battery cell 21 away from the end cap 212 to achieve heat exchange.

[0111] Optionally, the intermediate heat exchange plate 42 contacts one of the two side walls distributed along a third direction in the housing 211 of the battery cell 21 to achieve heat exchange.

[0112] According to the battery device 100 provided in the first aspect embodiment of this application, the thermal management component 40 includes a connecting plate portion 41, an intermediate heat exchange plate portion 42, and a third layer plate 43. The intermediate heat exchange plate portion 42 forms a heat exchange channel 423 for the flow of heat exchange medium to achieve heat exchange with the battery cell assembly 20. The first channel 413 formed by the connecting plate portion 41 is used for the flow of the heat exchange medium to be exchanged to the intermediate heat exchange plate portion 42. The second channel 431 formed by the third layer plate 43 and the connecting plate portion 41 is used to collect the heat exchange medium that has been exchanged in the intermediate heat exchange plate portion 42. Thus, the thermal management component 40 can achieve unidirectional flow of the heat exchange medium through the first channel 413, the heat exchange channel 423, and the second channel 431, thereby avoiding the situation where the heat exchange medium to be exchanged mixes with the heat exchange medium that has already been exchanged before completing the heat exchange, resulting in underutilization, and improving the heat exchange efficiency.

[0113] The first plate 411, the second plate 412, and the third plate 43, stacked along the second direction, can be directly separated to form a first flow channel 413 and a second flow channel 431 that are not directly connected. This reduces the space required for the diversion of the heat exchange medium and the convergence of the heat exchanged medium, which helps to further improve the energy density of the battery device 100. The first flow channel 413 and the second flow channel 431 are connected by a heat exchange flow channel 423 formed by the intermediate heat exchange plate 42 without the need for additional pipe joints, simplifying the flow path and facilitating the fabrication and processing of the thermal management component 40. Furthermore, the plate-type thermal management component 40 can be adapted to different specifications of the battery device 100 by adjusting the plate thickness and extension length, flexibly adapting to different usage scenarios of various electrical devices. Compared with the pipe-type thermal management component 40, this helps to control R&D costs.

[0114] According to some embodiments of the first aspect of this application, there are multiple battery cell assemblies 20, which are arranged along a third direction. The third direction is intersected with the first and second directions. The projection of the intermediate heat exchange plate portion 42 along the second direction covers at least a portion of the adjacent battery cell assemblies 20 for heat exchange with the adjacent battery cell assemblies 20.

[0115] Optionally, each battery cell assembly 20 can contact the intermediate heat exchange plate 42 to achieve heat exchange; or, some battery cell assemblies 20 can contact the intermediate heat exchange plate 42 to achieve heat exchange.

[0116] Alternatively, each battery cell 21 in the same battery cell assembly 20 can contact the intermediate heat exchange plate 42 to exchange heat, thereby improving the temperature uniformity of each battery cell 21 in the same battery cell assembly 20 and reducing the probability of local hot spots causing a chain reaction. Or, some battery cells 21 in the same battery cell assembly 20 can contact the intermediate heat exchange plate 42 to exchange heat, thereby achieving compensatory heat exchange for certain battery cells 21.

[0117] Optionally, the intermediate heat exchange plate section 42 may not cover the pressure relief mechanism of the end cap 212 of the battery cell 21, so as to keep the pressure relief channel of the battery cell 21 open and improve the safety performance of use.

[0118] Optionally, the battery cell assembly 20 can directly contact the intermediate heat exchange plate 42 to achieve heat exchange; or, the battery cell assembly 20 can indirectly contact the intermediate heat exchange plate 42 to complete heat exchange, for example, a bar or sampling wire harness is provided between the battery cell assembly 20 and the intermediate heat exchange plate 42.

[0119] Therefore, the intermediate heat exchange plate 42 is positioned corresponding to the shoulder of the battery cell 21 to avoid obstructing structures such as the pressure relief valve on the top of the battery cell 21. Furthermore, one intermediate heat exchange plate 42 can exchange heat with the shoulder positions of two battery cell assemblies 20 to improve the heat exchange efficiency between the thermal management assembly 40 and the battery cell assembly 20.

[0120] According to some embodiments of the first aspect of this application, a plurality of intermediate heat exchange plate portions 42 are provided. The intermediate heat exchange plate portions 42 are provided with liquid inlet channel 4231 and liquid outlet channel 4232. The heat exchange medium in the liquid inlet channel 4231 flows away from the connecting plate portion 41, and the heat exchange medium in the liquid outlet channel 4232 flows towards the connecting plate portion 41. The liquid inlet channel 4231 is connected to the first channel 413. A first hole 4201 is opened on the side of the intermediate heat exchange plate portion 42 near the third layer plate 43 to connect the liquid outlet channel 4232 and the second channel 431.

[0121] Optionally, the number of intermediate heat exchange plate sections 42 is one less than the number of battery cell modules 20, allowing the shoulders of any two adjacent battery cell modules 20 along a third direction to contact the intermediate heat exchange plate section 42 for heat exchange. Furthermore, increasing the number of intermediate heat exchange plate sections 42 increases the total contact area between all battery cell modules 20 and the thermal management component 40, further improving the heat exchange efficiency inside the battery device 100. For example, the number of intermediate heat exchange plate sections 42 is the same as the number of battery cell modules 20; or, the number of intermediate heat exchange plate sections 42 is one more than the number of battery cell modules 20.

[0122] Optionally, the number of intermediate heat exchange plate sections 42 is less than the number of battery cell assemblies 20. For example, every two battery cell assemblies 20 are correspondingly arranged with one intermediate heat exchange plate section 42, so that each battery cell assembly 20 can exchange heat by contacting the intermediate heat exchange plate section 42 through one shoulder.

[0123] Optionally, multiple liquid inlet channels 4231 are provided, and the number of liquid outlet channels 4232 is the same as that of liquid inlet channels 4231. The liquid inlet channels 4231 and liquid outlet channels 4232 are connected in series and interleaved. The liquid outlet channel 4232 that is farthest from the first channel 413 is connected to the second channel 431. The heat exchange medium can be turned back multiple times in the intermediate heat exchange plate section 42 through multiple liquid inlet channels 4231 and multiple liquid outlet channels 4232 to extend the flow path and make more sufficient contact with the battery cell assembly 20 for heat exchange.

[0124] Therefore, multiple intermediate heat exchange plates 42 can be correspondingly arranged with multiple battery cell modules 20. Some battery cell modules 20 can exchange heat with two intermediate heat exchange plates 42 respectively through two shoulder sections arranged along a third direction, further improving the heat exchange efficiency between the thermal management component 40 and the battery cell modules 20. Furthermore, the intermediate heat exchange plates 42 further guide the flow direction of the heat exchange medium through the liquid inlet channel 4231 and the liquid outlet channel 4232.

[0125] According to some embodiments of the first aspect of this application, the thermal management assembly 40 further includes a first end heat exchange plate portion 44 connected to the connecting plate portion 41, an inlet 401 is opened at the end of the first end heat exchange plate portion 44 away from the connecting plate portion 41, the first end heat exchange plate portion 44 is disposed on one side of a plurality of intermediate heat exchange plate portions 42 along a third direction, the first end heat exchange plate portion 44 forms a first unidirectional flow channel 441, and the inlet 401 communicates with the first flow channel 413 through the first unidirectional flow channel 441.

[0126] Optionally, the first unidirectional flow channel 441 is formed to facilitate the fabrication and molding of the first end heat exchange plate portion 44.

[0127] Optionally, multiple first unidirectional flow channels 441 are formed. The heat exchange medium supplied by the liquid inlet 401 is divided into multiple streams and flows to the first flow channel 413 simultaneously. This reduces the flow resistance of the first end heat exchange plate portion 44 and improves the flow capacity, so as to prevent the heat exchange medium from being blocked at the first unidirectional flow channel 441 and thus failing to be supplied to the first flow channel 413 and each heat exchange channel 423 in a timely manner.

[0128] Optionally, the heat exchange medium in the first unidirectional flow channel 441 flows toward the connecting plate portion 41.

[0129] It is understandable that the flow capacity of a flow channel is proportional to the cross-sectional area of ​​the flow channel within a certain period of time.

[0130] Optionally, the cross-sectional area of ​​the first unidirectional flow channel 441 is larger than the cross-sectional area of ​​the heat exchange flow channel 423, so that the first unidirectional flow channel 441 has a stronger flow capacity and can meet the liquid inlet requirements of multiple heat exchange flow channels 423. When multiple first unidirectional flow channels 441 are provided, at least the total cross-sectional area of ​​all first unidirectional flow channels 441 is larger than the cross-sectional area of ​​the heat exchange flow channel 423.

[0131] Further optionally, the cross-sectional area of ​​the first unidirectional flow channel 441 is greater than the cross-sectional area of ​​the first flow channel 413. When multiple first unidirectional flow channels 441 are provided, the total cross-sectional area of ​​at least all the first unidirectional flow channels 441 is greater than the cross-sectional area of ​​the first flow channel 413.

[0132] Therefore, the liquid inlet 401 can supply the heat exchange medium to the first flow channel 413 through the first unidirectional flow channel 441, and the medium can be diverted to different heat exchange channels 423 through the first flow channel 413 to achieve heat exchange for each battery cell assembly 20. The first end heat exchange plate portion 44 can also be disposed corresponding to the battery cell assembly 20 located at the edge along the third direction among the multiple battery cell assemblies 20, and achieve heat exchange with the shoulder of each battery cell 21 in the battery cell assembly 20. Furthermore, the first end heat exchange plate portion 44 can be used to separate the liquid inlet 401 from the first flow channel 413 and the second flow channel 431, thereby reducing the size of the thermal management assembly 40 in the second direction and reducing the installation space requirements of the thermal management assembly 40 within the battery device 100.

[0133] According to some embodiments of the first aspect of this application, the first layer plate 411 is recessed in the direction away from the second layer plate 412 to form a first recess, the second layer plate 412 is recessed in the direction away from the first layer plate 411 to form a second recess, a first flow cavity 442 is formed between the first recess and the second recess, and the first unidirectional flow channel 441 and the first flow channel 413 are connected through the first flow cavity 442.

[0134] Optionally, the cross-sectional area of ​​the first flow cavity 442 is larger than the cross-sectional area of ​​the first flow channel 413.

[0135] Alternatively, the cross-sectional area of ​​the first flow cavity 442 is smaller than the cross-sectional area of ​​the first unidirectional flow channel 441. The first flow cavity 442 can be used as a buffer section between the first unidirectional flow channel 441 and the first flow channel 413 to reduce the flow resistance caused by the sudden change in the cross-sectional area of ​​the flow channel and accelerate the flow of the heat exchange medium.

[0136] Optionally, the cross-sectional area of ​​the first flow cavity 442 is larger than the cross-sectional area of ​​the first unidirectional flow channel 441.

[0137] Optionally, the orthographic projection of the first flow cavity 442 onto a plane perpendicular to the second direction does not overlap with the orthographic projection of the second flow channel 431 onto a plane perpendicular to the second direction. In other words, the third layer plate 43 avoids the first and second recesses to further reduce the size of the thermal management assembly 40 in the second direction.

[0138] Therefore, compared with the first flow channel 413, the first flow cavity 442 formed between the first recess and the second recess has a larger flow channel cross-sectional area, thus having a stronger flow capacity, which can reduce the flow resistance of the first unidirectional flow channel 441 to the first flow channel 413 and accelerate the flow of the heat exchange medium.

[0139] According to some other embodiments of the first aspect of this application, the first layer plate 411 is a flat plate, and the second layer plate 412 is recessed in the direction away from the first layer plate 411 to form a third recess. The third recess and the first layer plate 411 define a first flow cavity 442, and the cross-sectional area of ​​the first flow cavity 442 is larger than the cross-sectional area of ​​the first flow channel 413.

[0140] According to some embodiments of the first aspect of this application, the thermal management assembly 40 further includes a second end heat exchange plate portion 45 connected to the connecting plate portion 41. The liquid outlet 402 is opened at the end of the second end heat exchange plate portion 45 away from the connecting plate portion 41. The second end heat exchange plate portion 45 is disposed on the side of a plurality of intermediate heat exchange plate portions 42 away from the first end heat exchange plate portion 44 along a third direction. The second end heat exchange plate portion 45 forms a second unidirectional flow channel 451. The flow direction of the second unidirectional flow channel 451 is opposite to that of the first unidirectional flow channel 441. The second flow channel 431 is connected to the liquid outlet 402 through the second unidirectional flow channel 451.

[0141] Optionally, the second unidirectional flow channel 451 is formed to facilitate the fabrication and molding of the second end heat exchange plate portion 45.

[0142] Optionally, multiple second unidirectional flow channels 451 are formed. The heat exchanged medium in the multiple heat exchange channels 423 is merged through the second flow channel 431 and then divided into multiple streams at the second end heat exchange plate portion 45 to flow to the liquid outlet 402, so as to reduce the flow resistance of the second end heat exchange plate portion 45 and accelerate the discharge of the heat exchanged medium from the heat management component 40.

[0143] Optionally, the heat exchange medium in the second unidirectional flow channel 451 flows away from the connecting plate portion 41.

[0144] Optionally, the cross-sectional area of ​​the second unidirectional flow channel 451 is larger than that of the heat exchange flow channel 423, so that the second unidirectional flow channel 451 has a stronger flow capacity and can meet the liquid inlet requirements of multiple heat exchange flow channels 423. When multiple second unidirectional flow channels 451 are provided, at least the total cross-sectional area of ​​all the second unidirectional flow channels 451 is greater than the cross-sectional area of ​​the heat exchange flow channel 423.

[0145] Further optionally, the cross-sectional area of ​​the second unidirectional flow channel 451 is greater than the cross-sectional area of ​​the second flow channel 431. When multiple second unidirectional flow channels 451 are provided, the total cross-sectional area of ​​at least all the second unidirectional flow channels 451 is greater than the cross-sectional area of ​​the second flow channel 431.

[0146] Therefore, by providing the second end heat exchange plate 45, the heat-exchanged medium can flow out of the thermal management component 40 through the second unidirectional flow channel 451 and the outlet 402 for collection. During its flow within the second unidirectional flow channel 451, the heat-exchanged medium can also exchange heat with the shoulders of individual battery cells 21 within the battery cell assembly 20 located on the other side along the third direction, thus fully utilizing the heat exchange medium. Furthermore, the second end heat exchange plate 45 can also be used to separate the outlet 402 from the first flow channel 413 and the second flow channel 431, reducing the size of the thermal management component 40 in the second direction and lowering the installation space requirements of the thermal management component 40 within the battery device 100.

[0147] According to some embodiments of the first aspect of this application, among the plurality of intermediate heat exchange plate portions 42, the intermediate heat exchange plate portion 42 that is far from the first end heat exchange plate portion 44 is connected to the second unidirectional flow channel 451 through the liquid outlet flow channel 4232.

[0148] Therefore, after the heat exchange medium in the heat exchange channel 423 near the second end heat exchange plate 45 has completed heat exchange, it can flow directly from the connecting plate 41 to the second unidirectional channel 451 without having to flow through the second channel 431 again, which reduces the flow resistance of this part of the heat exchange medium and accelerates the flow of the heat exchange medium in the thermal management component 40.

[0149] According to some embodiments of the first aspect of this application, a second flow cavity 452 is formed in the second end heat exchange plate portion 45. The second flow cavity 452 is disposed at one end of the second end heat exchange plate portion 45 for connecting the connecting plate portion 41. The second flow channel 431 is connected to the second unidirectional flow channel 451 through the second flow cavity 452.

[0150] Optionally, the cross-sectional area of ​​the second flow cavity 452 is larger than the cross-sectional area of ​​the heat exchange channel 423.

[0151] Optionally, the cross-section of the second flow cavity 452 is larger than the cross-sectional area of ​​the second flow channel 431.

[0152] Alternatively, the cross-sectional area of ​​the second flow cavity 452 is greater than the sum of the cross-sectional areas of the heat exchange channel 423 and the second flow channel 431, so as to prevent the heat exchanged medium after confluence from becoming blocked before entering the second unidirectional flow channel 451, and reduce the flow resistance of the heat exchanged medium in the process of flowing to the outlet 402.

[0153] Alternatively, the cross-sectional area of ​​the second flow cavity 452 is smaller than that of the second unidirectional flow channel 451. The second flow cavity 452 can form a buffer effect between the second unidirectional flow channel 451, the second flow channel 431, and the last heat exchange flow channel 423, suppressing the increase in flow resistance caused by the abrupt change in the cross-sectional area of ​​the flow channel.

[0154] Alternatively, the cross-sectional area of ​​the second flow cavity 452 is larger than the cross-sectional area of ​​the second unidirectional flow channel 451.

[0155] Therefore, the second flow cavity 452 can merge the heat exchanged medium flowing in the heat exchange channel 423 near the second end heat exchange plate 45 and the second flow channel 431 and guide it to flow into the second flow channel 431 and finally flow out of the heat management component 40 through the liquid outlet 402, thereby reducing the thermal resistance between the second flow channel 431 and the second one-way flow channel 451 and accelerating the flow of the heat exchanged medium to the liquid outlet 402.

[0156] According to some embodiments of the first aspect of this application, the liquid inlet 401 is opened on the side of the connecting plate portion 41 away from the third layer plate 43, and the liquid inlet 401 and the liquid outlet 402 are respectively disposed on both sides of the connecting plate portion 41 along the third direction.

[0157] Optionally, the outlet 402 is located on the side of the connecting plate portion 41 opposite to the third layer plate 43. It is understood that a gap is formed between the battery cell assembly 20 and the casing or other wall portion used to store the battery cell assembly 20, which can accommodate the inlet 401. This gap can also be used to accommodate the outlet 402 to fully utilize the gap. Furthermore, the design that the inlet 401 and outlet 402 are located on the same side of the connecting plate portion 41 helps control the dimensions of the thermal management assembly 40 in the second direction.

[0158] Optionally, the outlet 402 is located on the third layer plate 43 to directly connect to the second flow channel 431 to discharge the heat exchanged medium.

[0159] Therefore, the inlet 401 is directly connected to the first flow channel 413 to supply the heat exchange medium, and the second flow channel 431 is connected to the outlet 402 to collect the heat exchanged medium. This connects the flow path between the connecting plate 41 and the third plate 43 and the inlet 401 and outlet 402, improving heat exchange efficiency. Furthermore, the temperature of the heat exchange medium at the inlet of each intermediate heat exchange plate 42 and the temperature of the heat exchanged medium at the outlet tend to be consistent, and the heat exchange efficiency of each battery cell assembly 20 in the battery device 100 tends to be the same, which helps to suppress the occurrence of local hot spots in the battery device 100.

[0160] According to some embodiments of the first aspect of this application, the third layer plate 43 is disposed on the side of the connecting plate portion 41 away from the battery cell assembly 20, and the second flow channel 431 is connected to the liquid outlet 402 through the liquid outlet flow channel 4232 of one of the intermediate heat exchange plate portions 42.

[0161] Optionally, the thickness of the second plate 412 used to separate the first flow channel 413 and the second flow channel 431 is greater than the thickness of the first plate 411, and the thickness of the second plate 412 is greater than the thickness of the third plate 43, so as to reduce the heat exchange between the heat exchange medium to be exchanged in the first flow channel 413 and the heat exchanged medium in the second flow channel 431 through the second plate 412.

[0162] Optionally, the third layer plate 43 also includes an extension 432 that extends away from the connecting plate portion 41. The extension 432 can be connected to the intermediate heat exchange plate portion 42 to enhance the structural stability of the thermal management assembly 40.

[0163] Alternatively, the extension 432 is connected to the intermediate heat exchange plate 42 via a threaded connector.

[0164] Alternatively, the extension 432 may be bonded and fixed to the intermediate heat exchange plate 42.

[0165] Alternatively, the extension 432 is brazed to the intermediate heat exchange plate 42.

[0166] Therefore, the second flow channel 431 is separately arranged from the inlet 401 and the outlet 402 along the second direction to avoid them, so that the second flow channel 431 can communicate with each intermediate heat exchange plate section 42 to collect the heat exchanged medium in each heat exchange flow channel 423. Furthermore, the second flow channel 431 and the outlet 402 can communicate through the outlet flow channel 4232 of one of the heat exchange flow channels 423 to discharge the collected heat exchanged medium from the thermal management assembly 40.

[0167] According to some embodiments of the first aspect of this application, in a plurality of intermediate heat exchange plate portions 42, the liquid inlet channel 4231 includes at least two liquid inlet sub-channels 42311, and the liquid outlet channel 4232 includes at least two liquid outlet sub-channels 42321, with the liquid inlet sub-channels 42311 and the liquid outlet sub-channels 42321 connected in a one-to-one correspondence.

[0168] Optionally, each intermediate heat exchange plate section 42 forms a heat exchange channel 423 including two liquid inlet sub-channels 42311 and two liquid outlet sub-channels 42321.

[0169] Optionally, one portion of the heat exchange channels 423 in the plurality of intermediate heat exchange plate sections 42 includes two liquid inlet sub-channels 42311 and two liquid outlet sub-channels 42321, while the other portion of the heat exchange channels 423 has a single liquid inlet channel 4231 and a single liquid outlet channel 4232.

[0170] Optionally, the cross-sectional area of ​​the outer liquid inlet channel 42311 is larger than that of the inner liquid inlet channel 42311, and correspondingly, the cross-sectional area of ​​the outer liquid outlet channel 42321 is larger than that of the inner liquid outlet channel 42321. It can be understood that, since the intermediate heat exchange plate portion 42 is disposed between two adjacent battery cell modules 20, the inner liquid inlet channel 42311 is closer to the gap between the two battery cell modules 20, while the outer liquid inlet channel 42311 has a larger contact area with the shoulder of the battery cell 21. This allows the heat exchange medium within the outer channel to achieve more thorough heat exchange with the battery cell module 20, thereby improving heat exchange efficiency.

[0171] Optionally, the two inlet sub-channels 42311 have the same cross-sectional area, and the two outlet sub-channels 42321 have the same cross-sectional area.

[0172] It is understandable that the number of inlet liquid sub-channels 42311 and outlet liquid sub-channels 42321 can be increased depending on the actual heat exchange requirements.

[0173] As a result, the heat exchange medium flowing in each intermediate heat exchange plate section 42 is diverted, accelerating the flow of the heat exchange medium and improving the heat exchange efficiency.

[0174] According to some embodiments of the first aspect of this application, the intermediate heat exchange plate portion 42 includes a sealing plate 421 and a flow channel plate 422 connected to each other. The flow channel plate 422 is disposed on the side of the sealing plate 421 away from the battery cell assembly 20, and at least a portion of the flow channel plate 422 is recessed in the direction away from the battery cell assembly 20 to form a heat exchange flow channel 423.

[0175] It is understandable that when the third layer plate 43 is disposed on the side of the connecting plate portion 41 away from the battery cell assembly 20, the first hole 4201 is opened in the flow channel plate 422; when the third layer plate 43 is disposed on the side of the connecting plate portion 41 facing the battery cell assembly 20, the first hole 4201 is opened in the sealing plate 421.

[0176] Optionally, the intermediate heat exchange plate 42 also includes fins. The fins are disposed on the side of the sealing plate 421 away from the flow channel plate 422. The fins can extend into the gap between two adjacent battery cell assemblies 20 and exchange heat with the housing 211 of the battery cell 21 to improve the heat exchange efficiency between the intermediate heat exchange plate 42 and the battery cell assembly 20.

[0177] Optionally, the wall surface of the sealing plate 421 facing the battery cell assembly 20 is flat to increase the contact area between the intermediate heat exchange plate portion 42 and the shoulder of the battery cell 21, thereby improving heat exchange efficiency.

[0178] Optionally, the sealing plate 421 has a groove formed on the side facing the battery cell assembly 20. The groove can be used to accommodate a bar or sampling harness, and the wall surface other than the groove can contact the end cap 212 of the battery cell 21 for heat exchange.

[0179] Therefore, the intermediate heat exchange plate 42 contacts the battery cell assembly 20 for heat exchange through the plane of the sealing plate 421, increasing the heat exchange area and improving the heat exchange efficiency between the battery cell assembly 20 and the thermal management assembly 40. Furthermore, the sealing plate 421 is easy to process and form, requiring lower alignment accuracy when installing it onto the battery cell assembly 20, and saving assembly time for the thermal management assembly 40.

[0180] According to some embodiments of the first aspect of this application, the sealing plate 421 is bonded and fixed to the flow channel plate 422, or the sealing plate 421 is brazed to the flow channel plate 422.

[0181] It is understandable that the sealing plate 421 and the flow channel plate 422 can also be fixed by other sealing connection methods to achieve the circumferential sealing of the heat exchange flow channel 423.

[0182] This facilitates the sealing and fixing of the sealing plate 421 and the flow channel plate 422, forming a heat exchange flow channel 423 for the heat exchange medium to circulate, thereby realizing heat exchange between the thermal management component 40 and the battery cell component 20.

[0183] According to some embodiments of the first aspect of this application, the flow channel plate 422 is a stamped part.

[0184] Optionally, the flow channel plate 422 is formed by sheet metal processing.

[0185] Understandably, depending on the actual product requirements, the flow channel plate 422 can also be formed by casting or other processes to give the flow channel plate 422 good sealing performance.

[0186] This facilitates the processing of the flow channel plate 422, enabling the flow channel plate 422 to form a heat exchange flow channel 423 under the sealing effect of the sealing plate 421.

[0187] According to some embodiments of the first aspect of this application, the sealing plate 421 and the first layer plate 411 are an integral structure. In other words, the sealing plate 421 and the first layer plate 411 can be manufactured simultaneously.

[0188] According to some embodiments of the first aspect of this application, the flow channel plate 422 and the second layer plate 412 are an integral structure. In other words, the flow channel plate 422 and the second layer plate 412 can be manufactured simultaneously.

[0189] Therefore, the intermediate heat exchange plate 42 and the connecting plate 41 can be connected and the first flow channel 413 and the heat exchange flow channel 423 can be connected during the assembly of the sealing plate 421 and the flow channel plate 422, thereby reducing the production cost and assembly difficulty of the thermal management component 40 and the battery device 100.

[0190] According to some embodiments of the first aspect of this application, at least a portion of the second layer plate 412 is recessed toward the direction away from the battery cell assembly 20 to form a first flow channel 413.

[0191] Optionally, the first layer plate 411 is a flat plate to facilitate processing and shaping. Furthermore, the flat plate form of the first layer plate 411 facilitates its cooperation with the third layer plate 43 to form the second flow channel 431 or to connect with the liquid inlet 401 and the liquid outlet 402.

[0192] Optionally, the first layer plate 411 is recessed in the direction away from the second layer plate 412 to increase the cross-sectional area of ​​the first flow channel 413 and improve the flow capacity of the first flow channel 413.

[0193] Therefore, the first flow channel 413 and the battery cell assembly 20 are separated in the second direction, giving the battery device 100 more room to increase its energy density.

[0194] According to some embodiments of the first aspect of this application, the third layer plate 43 is a stamped part.

[0195] Optionally, the third layer 43 is formed by sheet metal processing.

[0196] Understandably, depending on the actual product requirements, the third layer 43 can also be formed using a molding process or other processes to ensure that the third layer 43 has good sealing performance.

[0197] This facilitates the processing and forming of the third layer plate 43, and the third layer plate 43 can directly form the second flow channel 431 to be sealed during the preparation process.

[0198] According to some embodiments of the first aspect of this application, the second layer plate 412 is a stamped part.

[0199] Optionally, the second layer 412 is formed by sheet metal processing.

[0200] Understandably, depending on the actual product requirements, the second layer 412 can also be formed using a molding process or other processes to ensure that the second layer 412 has good sealing performance.

[0201] This facilitates the processing and forming of the second layer plate 412, and the second layer plate 412 can directly form the first flow channel 413 to be closed by the first layer plate 411 during the stamping process.

[0202] According to some embodiments of the first aspect of this application, the battery device 100 further includes a housing assembly 50 for accommodating the battery cell assembly 20. The housing assembly 50 includes a housing body 51 and a first limiting beam 52 disposed in the housing body 51 along a third direction. One end of the intermediate heat exchange plate portion 42 away from the connecting plate portion 41 is connected to the first limiting beam 52.

[0203] Optionally, the enclosure assembly 50 also includes a cover 54, which can be closed onto the enclosure body 51 to seal the internal battery cell assembly 20 and thermal management assembly 40, preventing the intrusion of external debris. The cover 54 and the enclosure body 51 can be detachably connected via a threaded connector.

[0204] It is understood that the first limiting beam 52 can form a bidirectional constraint on the box body 51 in its own extension direction, so as to reduce the probability of the box body 51 deforming under the expansion of the battery cell 21 or the impact of external force, and improve the structural stability of the battery device 100.

[0205] Optionally, the intermediate heat exchange plate portion 42 is bonded and fixed to the first limiting beam 52.

[0206] Optionally, the intermediate heat exchange plate 42 is connected and fixed to the first limiting beam 52 by a threaded connector.

[0207] Optionally, the intermediate heat exchange plate 42 is brazed to the first limiting beam 52.

[0208] Therefore, the thermal management component 40 can be relatively fixed with the housing component 50 and the battery cell component 20 through the connection between the intermediate heat exchange plate part 42 and the first limiting beam 52, thereby improving the heat exchange stability of the battery cell component 20.

[0209] According to some embodiments of the first aspect of this application, the housing assembly 50 further includes a second limiting beam 53 extending along a third direction. The second limiting beam 53 and the first limiting beam 52 are respectively disposed at both ends of the battery cell assembly 20 along a first direction, and the end of the intermediate heat exchange plate portion 42 near the connecting plate portion 41 is connected to the second limiting beam 53.

[0210] It is understood that the first limiting beam 52 and the second limiting beam 53, which are set at intervals, can simultaneously apply this bidirectional constraint applied in the third direction to both ends of the box body 51 along the first direction, so as to suppress the deformation of the box body 51 to the greatest extent, thereby suppressing the expansion of the battery cell 21 and reducing the risk of deformation of the battery cell 21.

[0211] Optionally, the intermediate heat exchange plate 42 is bonded and fixed to the second limiting beam 53.

[0212] Optionally, the intermediate heat exchange plate 42 and the second limiting beam 53 are connected and fixed by threaded connectors.

[0213] Optionally, the intermediate heat exchange plate 42 is brazed to the second limiting beam 53.

[0214] Therefore, the two ends of the thermal management component 40 along the first direction are respectively connected and fixed to the first limiting beam 52 and the second limiting beam 53, which improves the connection strength between the thermal management component 40 and the housing component 50 while restricting the movement of the thermal management component 40 along the first direction, thus avoiding the situation where the middle heat exchange plate part 42 is heated and warped, making it impossible to achieve contact heat exchange.

[0215] According to some embodiments of the first aspect of this application, the thermal management assembly 40 further includes a reinforcing plate 46, which is connected to the second limiting beam 53 and is located on the side of the intermediate heat exchange plate portion 42 away from the second limiting beam 53.

[0216] Optionally, when the reinforcing plate 46 is connected to the second limiting beam 53, the reinforcing plate 46 is pressed against at least a portion of the intermediate heat exchange plate portion 42.

[0217] Optionally, the reinforcing plate 46 is fastened to the intermediate heat exchange plate portion 42.

[0218] Optionally, each intermediate heat exchange plate section 42 is provided with a corresponding reinforcing plate 46, which is located at one end of the intermediate heat exchange plate section 42 along the first direction.

[0219] Optionally, each intermediate heat exchange plate section 42 is provided with a plurality of reinforcing plates 46, which are spaced apart along the first direction to form a multi-point constraint on the intermediate heat exchange plate section 42.

[0220] Therefore, the reinforcing plate 46 and the second limiting beam 53 can respectively apply constraints from both ends of the intermediate heat exchange plate 42 along the first direction, so as to further improve the connection stability of the intermediate heat exchange plate 42 and the thermal management component 40 in the box.

[0221] According to some embodiments of the first aspect of this application, a relief groove 424 is formed at one end of the intermediate heat exchange plate portion 42 near the connecting plate portion 41, and the opening of the relief groove 424 is disposed away from the second limiting beam 53 to accommodate at least part of the reinforcing plate 46.

[0222] Optionally, when the reinforcing plate 46 is connected to the intermediate heat exchange plate 42, the surface of the reinforcing plate 46 facing away from the battery cell assembly 20 is flush with the surface of the intermediate heat exchange plate 42 facing away from the battery cell assembly 20.

[0223] Optionally, when the reinforcing plate 46 is connected to the intermediate heat exchange plate portion 42, the surface of the reinforcing plate 46 facing away from the battery cell assembly 20 protrudes from the surface of the intermediate heat exchange plate portion 42 facing away from the battery cell assembly 20.

[0224] Therefore, the arrangement of the clearance slot 424 can further compress the size of the thermal management component 40 in the second direction, reduce the installation space requirements of the thermal management component 40, and help improve the energy density of the battery device 100.

[0225] According to some embodiments of the first aspect of this application, the reinforcing plate 46 is bonded to the intermediate heat exchange plate portion 42, or the reinforcing plate 46 is welded to the intermediate heat exchange plate portion 42, or the reinforcing plate 46 is bolted to the intermediate heat exchange plate portion 42 and the second limiting beam 53.

[0226] Thus, the reinforcing plate 46 is fixedly connected to the intermediate heat exchange plate portion 42 to constrain the deformation and warping of the intermediate heat exchange plate portion 42 in the second direction.

[0227] According to some embodiments of the first aspect of this application, the thermal management assembly 40 further includes an end plate 47, which is disposed at one end of the intermediate heat exchange plate portion 42 away from the connecting plate portion 41, and the end plate 47 and the first limiting beam 52 are disposed on both sides of the intermediate heat exchange plate portion 42 along the second direction.

[0228] Optionally, the end plate 47 is pressed onto the intermediate heat exchange plate portion 42.

[0229] Optionally, the end plate 47 is brazed to the intermediate heat exchange plate portion 42.

[0230] Optionally, the end plate 47 is connected to the intermediate heat exchange plate portion 42 by a threaded connector.

[0231] Optionally, the end plate 47 is bonded and fixed to the intermediate heat exchange plate portion 42.

[0232] Therefore, the end plate 47 can cooperate with the first limiting beam 52 to apply bidirectional constraint to the end of the intermediate heat exchange plate portion 42 away from the connecting plate portion 41, so as to limit the deformation such as warping caused by heat at the end of the intermediate heat exchange plate portion 42 away from the connecting plate portion 41.

[0233] According to some embodiments of the first aspect of this application, the battery device 100 further includes a high-voltage box 60 electrically connected to the battery cell assembly 20, and the high-voltage box 60 and the connecting plate portion 41 are respectively disposed on both sides of the battery cell assembly 20 along a first direction.

[0234] The high-voltage box 60 is the high-voltage power management component in the battery device 100. It serves as an intermediate hub between the battery device 100 and external electrical components (such as the motor and fast-charging interface of a new energy vehicle). It receives the high-voltage power transmitted from the battery cell module 20 via the battery pack and distributes it to different external components as needed, such as powering the motor to drive the vehicle or powering the on-board charger for fast charging. The high-voltage box 60 has built-in overcurrent, overvoltage, short-circuit, and leakage protection modules. If the output voltage of the battery device 100 is too high, the current is too large, or leakage occurs, the high-voltage box 60 will quickly cut off the circuit, thus preventing damage to external components (such as the motor) or safety accidents (such as electric shock or fire) to a certain extent.

[0235] Therefore, the design of the high-voltage box 60 and the connecting plate portion 41 being respectively disposed on both sides of the battery cell assembly 20 in the first direction helps to reduce the size of the battery device 100 in the second direction.

[0236] Secondly, embodiments of this application provide an electrical device, which includes the battery device 100 provided in any embodiment of the first aspect.

[0237] For ease of understanding, the specific embodiments shown in the accompanying drawings of this application are explained below.

[0238] Please see Figures 6 to 10 In one embodiment, the battery device 100 includes a battery cell assembly 20 and a thermal management assembly 40. The thermal management assembly 40 includes a connecting plate portion 41 and a first end heat exchange plate portion 44, an intermediate heat exchange plate portion 42, and a second end heat exchange plate portion 45 disposed on the same side of the connecting plate portion 41. The thermal management assembly 40 also includes a third layer plate 43 disposed on the side of the connecting plate portion 41 facing the battery cell assembly 20. The connecting plate portion 41 forms a first flow channel 413, and the third layer plate 43 and the connecting plate portion 41 form a second flow channel 431. Most of the heat exchange medium can flow sequentially through the inlet 401 → the first unidirectional flow channel 441 → the first flow channel 413 → the heat exchange flow channel 423 → the second flow channel 431 → the second unidirectional flow channel 451 → the outlet 402, thereby achieving contact heat exchange with the shoulder of the battery cell 21 in each battery cell assembly 20, making full use of the heat exchange medium and improving the heat exchange efficiency. The remaining heat exchange medium can flow sequentially through the inlet 401 → first unidirectional flow channel 441 → first flow channel 413 → heat exchange channel 423 → second unidirectional flow channel 451 → outlet 402, without needing to merge into the second flow channel 431. This reduces the merging pressure at the connection between the second flow channel 431 and the second unidirectional flow channel 451, further accelerating the flow of the heat exchange medium. Furthermore, by providing the first end heat exchange plate portion 44 and the second end heat exchange plate portion 45, the inlet 401 and outlet 402 are respectively located on both sides of the battery cell assembly 20 along the first direction, preventing them from accumulating on the same side and occupying space in the second direction of the battery device 100.

[0239] The battery assembly 100 also includes a housing assembly 50 and a high-voltage box 60. The high-voltage box 60 and the connecting plate portion 41 are respectively disposed on both sides of the battery cell assembly 20 along a first direction. The housing assembly 50 is used to house the battery cell assembly 20, the thermal management assembly 40, and the high-voltage box 60. The housing assembly 50 includes a housing body 51 and a first limiting beam 52 disposed within the housing body 51. The intermediate heat exchange plate portion 42 can be relatively fixed to the housing body 51 by the first limiting beam 52 to improve the connection stability between the thermal management assembly 40 and the battery cell assembly 20.

[0240] The heat exchange channel 423 of the intermediate heat exchange plate section 42 includes two liquid inlet sub-channels 42311 and two liquid outlet sub-channels 42321. There are two first unidirectional channels 441 and two second unidirectional channels 451 to accelerate the flow of the heat exchange medium.

[0241] In addition, the thermal management assembly 40 also includes a reinforcing plate 46 and an end plate 47 disposed at both ends of the intermediate heat exchange plate portion 42 along the first direction. The reinforcing plate 46 and the end plate 47 can be used to connect the intermediate heat exchange plate portion 42 with the housing assembly 50, thereby improving the connection strength between the thermal management assembly 40, the housing assembly 50, and the battery cell assembly 20, and preventing warping or other deformations of the intermediate heat exchange plate portion 42 during use.

[0242] Please see Figures 11 to 13 In one embodiment, the battery device 100 includes a battery cell assembly 20 and a thermal management assembly 40. The thermal management assembly 40 includes a connecting plate portion 41 and a first end heat exchange plate portion 44, an intermediate heat exchange plate portion 42, and a second end heat exchange plate portion 45 disposed on the same side of the connecting plate portion 41. The thermal management assembly 40 also includes a third layer plate 43 disposed on the side of the connecting plate portion 41 opposite to the battery cell assembly 20. The connecting plate portion 41 forms a first flow channel 413, and a second flow channel 431 is formed between the third layer plate 43 and the connecting plate portion 41. Each intermediate heat exchange plate portion 42 has a first hole 4201 on the side facing the third layer plate 43 to allow the heat exchanged medium to flow into the second flow channel 431. The second flow channel 431 can be used to collect the heat exchanged medium in each heat exchange channel 423 and transport it together to a second unidirectional flow channel 451 and then discharge it from the thermal management assembly 40 through the outlet 402, further realizing the separation of the heat exchange medium to be exchanged and the heat exchanged medium.

[0243] A first flow cavity 442 is formed between the first end heat exchange plate portion 44 and the connecting plate portion 41, and a second flow cavity 452 is formed between the connecting plate portion 41 and the second end heat exchange plate portion 45. The first flow cavity 442 and the second flow cavity 452 adopt an increased cross-sectional area design to improve the flow capacity, reduce the flow resistance of the heat exchange medium in the flow process, and accelerate the flow of the heat exchange medium.

[0244] Please see Figures 14 to 16 In one embodiment, the battery device 100 includes a battery cell assembly 20 and a thermal management assembly 40. The thermal management assembly 40 includes a connecting plate portion 41 and a plurality of intermediate heat exchange plate portions 42 disposed on one side of the connecting plate portion 41. The connecting plate portion 41 forms a first flow channel 413, which can divert flow to the heat exchange flow channels 423 of each intermediate heat exchange plate portion 42. The thermal management assembly 40 also includes a third layer plate 43 disposed on the side of the connecting plate portion 41 away from the battery cell assembly 20. A second flow channel 431 is formed between the connecting plate portion 41 and the third layer plate 43. Each intermediate heat exchange plate portion 42 has a first hole 4201 on the side facing the third layer plate 43. The second flow channel 431 can collect the heat exchanged medium in each heat exchange flow channel 423 through the first hole 4201.

[0245] Please see Figure 16 The inlet 401 and outlet 402 of the thermal management component 40 are located on the side of the connecting plate portion 41 away from the third layer plate 43. The second flow channel 431 can communicate with the outlet 402 through the outlet end of one of the heat exchange channels 423 to discharge the collected heat exchanged medium from the thermal management component 40. In this embodiment, the temperature of the heat exchange medium flowing in each intermediate heat exchange plate portion 42 tends to be the same, so the heat exchange effect received by different battery cell components 20 in the battery device 100 tends to be consistent, the temperature field in the battery device 100 tends to be uniform, effectively avoiding the occurrence of local hot spots and suppressing the occurrence of thermal runaway chain reaction.

[0246] 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: A battery cell assembly includes multiple battery cells arranged along a first direction; A thermal management assembly has a liquid inlet and a liquid outlet. The thermal management assembly further includes a connecting plate portion and an intermediate heat exchange plate portion connected to the connecting plate portion. The intermediate heat exchange plate portion extends along a first direction and is disposed on one side of the battery cell assembly along a second direction to exchange heat with a plurality of battery cells arranged along the first direction. The intermediate heat exchange plate portion forms a heat exchange channel. The connecting plate portion includes a first plate and a second plate stacked along the second direction. A first channel is formed between the first plate and the second plate. The first channel is used to communicate with the liquid inlet. The first direction and the second direction are arranged intersectingly. The thermal management component further includes a third layer plate, which is stacked with the connecting plate along the second direction and forms a second flow channel. The second flow channel is used to communicate with the liquid outlet, and the first flow channel and the second flow channel are connected through the heat exchange flow channel.

2. The battery device according to claim 1, characterized in that, The number of battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged along a third direction, which intersects with the first direction and the second direction. The projection of the intermediate heat exchange plate along the second direction covers at least a portion of the adjacent battery cell assemblies to exchange heat with the adjacent battery cell assemblies.

3. The battery device according to claim 2, characterized in that, The intermediate heat exchange plate section is provided with multiple intermediate heat exchange plates, each having an inlet flow channel and an outlet flow channel. The heat exchange medium in the inlet flow channel flows away from the connecting plate section, while the heat exchange medium in the outlet flow channel flows towards the connecting plate section. The inlet flow channel is connected to the first flow channel. A first hole is provided on the side of the intermediate heat exchange plate section near the third layer plate to connect the outlet flow channel and the second flow channel.

4. The battery device according to claim 3, characterized in that, The thermal management component further includes a first end heat exchange plate connected to the connecting plate portion. The liquid inlet is located at the end of the first end heat exchange plate portion away from the connecting plate portion. The first end heat exchange plate portion is disposed on one side of the plurality of intermediate heat exchange plates portions along the third direction. The first end heat exchange plate portion forms a first unidirectional flow channel. The liquid inlet communicates with the first flow channel through the first unidirectional flow channel.

5. The battery device according to claim 4, characterized in that, The first layer plate is recessed in the direction away from the second layer plate to form a first recess, and the second layer plate is recessed in the direction away from the first layer plate to form a second recess. A first flow cavity is formed between the first recess and the second recess, and the first unidirectional flow channel is connected to the first flow channel through the first flow cavity.

6. The battery device according to claim 4, characterized in that, The thermal management component further includes a second end heat exchange plate connected to the connecting plate. The liquid outlet is located at the end of the second end heat exchange plate away from the connecting plate. The second end heat exchange plate is disposed on the side of the plurality of intermediate heat exchange plates opposite to the first end heat exchange plate along the third direction. The second end heat exchange plate forms a second unidirectional flow channel. The flow direction of the second unidirectional flow channel is opposite to that of the first unidirectional flow channel. The second flow channel is connected to the liquid outlet through the second unidirectional flow channel.

7. The battery device according to claim 6, characterized in that, Of the plurality of intermediate heat exchange plates, the intermediate heat exchange plate that is furthest from the first end heat exchange plate is connected to the second unidirectional flow channel through the liquid outlet channel.

8. The battery device according to claim 7, characterized in that, The second end heat exchange plate portion has a second flow cavity, which is disposed at one end of the second end heat exchange plate portion for connecting the connecting plate portion, and the second flow channel is connected to the second unidirectional flow channel through the second flow cavity.

9. The battery device according to claim 3, characterized in that, The liquid inlet and the liquid outlet are located on the side of the connecting plate that is away from the third layer plate, and the liquid inlet and the liquid outlet are respectively located on both sides of the connecting plate along the third direction.

10. The battery device according to claim 9, characterized in that, The third layer plate is disposed on the side of the connecting plate portion away from the battery cell assembly, and the second flow channel is connected to the liquid outlet through the liquid outlet flow channel of one of the intermediate heat exchange plates.

11. The battery device according to claim 3, characterized in that, In the plurality of intermediate heat exchange plates, the liquid inlet channel includes at least two liquid inlet sub-channels, the liquid outlet channel includes at least two liquid outlet sub-channels, and the liquid inlet sub-channels and the liquid outlet sub-channels are connected in a one-to-one correspondence.

12. The battery device according to claim 3, characterized in that, The intermediate heat exchange plate includes a sealing plate and a flow channel plate connected together. The flow channel plate is disposed on the side of the sealing plate away from the battery cell assembly. The wall surface of the sealing plate facing the battery cell assembly is flat. At least a portion of the flow channel plate is recessed in the direction away from the battery cell assembly to form the heat exchange flow channel.

13. The battery device according to claim 12, characterized in that, The sealing plate is bonded and fixed to the flow channel plate, or the sealing plate is brazed to the flow channel plate.

14. The battery device according to claim 12, characterized in that, The flow channel plate is a stamped part.

15. The battery device according to claim 12, characterized in that, The sealing plate and the first layer plate are an integral structure, and / or the flow channel plate and the second layer plate are an integral structure.

16. The battery device according to claim 1, characterized in that, The first layer is a flat plate, and at least a portion of the second layer is recessed in a direction away from the battery cell assembly to form the first flow channel.

17. The battery device according to claim 16, characterized in that, The third layer is a stamped part, and / or the second layer is a stamped part.

18. The battery device according to claim 1, characterized in that, The battery device further includes a housing assembly for accommodating the battery cell assembly. The housing assembly includes a housing body and a first limiting beam disposed in the housing body along a third direction. The end of the intermediate heat exchange plate portion away from the connecting plate portion is connected to the first limiting beam.

19. The battery device according to claim 18, characterized in that, The housing assembly also includes a second limiting beam extending along the third direction. The second limiting beam and the first limiting beam are respectively disposed at both ends of the battery cell assembly along the first direction. The end of the intermediate heat exchange plate portion near the connecting plate portion is connected to the second limiting beam.

20. The battery device according to claim 19, characterized in that, The thermal management assembly also includes a reinforcing plate, which is connected to the second limiting beam and is located on the side of the intermediate heat exchange plate that is away from the second limiting beam.

21. The battery device according to claim 20, characterized in that, A relief groove is formed at one end of the intermediate heat exchange plate near the connecting plate, and the opening of the relief groove is disposed away from the second limiting beam to accommodate at least part of the reinforcing plate.

22. The battery device according to claim 20, characterized in that, The reinforcing plate is bonded and fixed to the intermediate heat exchange plate, or the reinforcing plate is welded and fixed to the intermediate heat exchange plate, or the reinforcing plate is bolted to the intermediate heat exchange plate and the second limiting beam.

23. The battery device according to claim 1, characterized in that, The battery device further includes a high-voltage box electrically connected to the battery cell assembly, and the high-voltage box and the connecting plate are respectively disposed on both sides of the battery cell assembly along the first direction.

24. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 23.

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