Battery device and electric device

Abstract

The application discloses a battery device and a power utilization device. The battery device comprises a battery monomer assembly and a thermal management assembly. The battery monomer assembly comprises a plurality of battery monomers stacked along a first direction, and a plurality of battery monomer assemblies are arranged along a second direction. The thermal management assembly is arranged on one side of the battery monomer assembly along a third direction. The thermal management assembly comprises a first plate and a second plate stacked along the third direction. The second plate is provided with a first groove on one side facing the first plate. The first plate and the inner wall of the first groove form a heat exchange flow channel and a current collection channel. The thermal management assembly comprises a plurality of heat exchange flow channels arranged along the second direction. The heat exchange flow channels extend along the first direction. Hollow parts are formed between adjacent heat exchange flow channels. The current collection channel comprises a first current collection channel and a second current collection channel arranged at two ends of the heat exchange flow channel along the first direction respectively. The current collection channel extends along the second direction. One current collection channel is connected with at least two heat exchange flow channels, so that the reliability of the battery device is improved.

Description

Technical Field

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

[0002] In recent years, battery devices have made great strides and can be widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, as well as in electric vehicles, power tools, military equipment and aerospace.

[0003] Improving the reliability of battery devices is an important research direction in the battery field. Summary of the Invention

[0004] This application provides a battery device and an electrical device that can improve the reliability of individual battery cells.

[0005] In a first aspect, embodiments of this application provide a battery device, including multiple battery cell assemblies and a thermal management assembly. Each battery cell assembly includes multiple battery cells stacked along a first direction, and the multiple battery cell assemblies are arranged along a second direction. The thermal management assembly is disposed on one side of the battery cell assembly along a third direction. The thermal management assembly includes a first plate and a second plate stacked along the third direction. The first plate is located on the side of the second plate facing the battery cell assembly, and the side of the second plate facing the first plate has a first groove. The inner walls of the first plate and the first groove enclose a heat exchange channel and a current collection channel. The thermal management assembly includes multiple heat exchange channels arranged along the second direction, and all heat exchange channels extend along the first direction. A hollow portion is formed between adjacent heat exchange channels. The current collection channel includes a first current collection channel and a second current collection channel, which are respectively arranged at both ends of the heat exchange channels along the first direction. The current collection channel extends along the second direction, and each current collection channel connects at least two heat exchange channels. The first direction, the second direction, and the third direction are mutually perpendicular.

[0006] In this embodiment of the application, by setting a first current collection channel and a second current collection channel at both ends of the heat exchange channel along the first direction, and by using the first current collection plate portion forming the first current collection channel and the second current collection plate portion forming the second current collection channel, at least two heat exchange plate portions forming at least two heat exchange channels are connected and fixed from both ends, thereby helping to improve the structural strength of the thermal management component, reduce the risk of deformation of the thermal management component during transportation, and improve the reliability of the battery device.

[0007] In some embodiments, the second collection channel includes a first sub-channel and a second sub-channel that are isolated from each other. The first and second sub-channels are spaced apart along a second direction and are respectively connected to multiple heat exchange channels. The first and second sub-channels allow for the individual collection or distribution of heat exchange media in their respective heat exchange channels, reducing mutual interference. They also facilitate the control of the flow direction of the heat exchange media in each heat exchange channel, improving the controllability and flexibility of the heat exchange media.

[0008] In some embodiments, the thermal management component further includes an inlet and an outlet. A first sub-channel is connected to the inlet, and a second sub-channel is connected to the outlet. At least a portion of each heat exchange channel connected to the first sub-channel is connected to a first manifold channel, and at least a portion of each heat exchange channel connected to the second sub-channel is connected to the first manifold channel. The heat exchange medium entering the first sub-channel from the inlet can flow into the first manifold channel via the heat exchange channel between the first sub-channel and the first manifold channel. Under the collection or distribution effect in the first manifold channel, it flows into the second sub-channel via the heat exchange channel between the first manifold channel and the second sub-channel, and flows out from the outlet, thereby realizing unidirectional flow of the heat exchange medium. This allows the heat exchange medium to exchange heat with the battery cells during the flow process, achieving dynamic heat exchange and helping to improve the heat exchange effect between the thermal management component and the battery cells.

[0009] In some embodiments, the multiple heat exchange channels include a first heat exchange channel, an intermediate heat exchange channel, and a second heat exchange channel arranged along a second direction. The intermediate heat exchange channel includes a first sub-channel, a second sub-channel, and a connecting sub-channel. Both the first and second sub-channels extend along a first direction and are interconnected through the connecting sub-channel. The first sub-channel is connected to a first sub-channel, and the second sub-channel is connected to a second sub-channel. A portion of the heat exchange medium entering the first sub-channel from the inlet can sequentially flow through the first sub-channel, the connecting sub-channel, and the second sub-channel, enter the second sub-channel, and exit from the outlet without flowing through the first collection channel. This reduces energy loss of the heat exchange medium in the intermediate heat exchange channel during flow, thereby improving the heat exchange effect between the heat exchange medium in the intermediate heat exchange channel and the corresponding battery cell, while achieving dynamic heat exchange between the heat exchange medium and the battery cell.

[0010] In some embodiments, along the second direction, the liquid inlet is located at the end of the first sub-channel away from the second sub-channel, and the liquid outlet is located at the end of the second sub-channel away from the first sub-channel. This helps to reduce the mutual influence of the heat exchange medium at the liquid inlet and the liquid outlet, and improve the heat exchange effect between the heat exchange medium flowing in from the liquid inlet and the battery cell.

[0011] In some embodiments, a second groove is provided on the side of the first plate facing the second plate. In the third direction, the second groove is disposed opposite to a portion of the first groove and surrounds to form a first flow collection channel. This helps to increase the depth of the first flow collection channel in the third direction. When the width of the first flow collection channel is fixed, it can improve the flow capacity of the first flow collection channel, increase the flow rate of the first flow collection channel, and thus improve the flow efficiency of the heat exchange medium in the first flow collection channel, thereby improving the heat exchange efficiency between the thermal management component and the battery cell.

[0012] In some embodiments, the battery device further includes a housing, a reinforcing plate, and a connector. The battery cell assembly and the thermal management assembly are disposed within the housing. The reinforcing plate is disposed within the thermal management assembly. A portion of the connector abuts against the side of the reinforcing plate away from the thermal management assembly, and another portion passes through the reinforcing plate and the thermal management assembly and is connected to the housing.

[0013] In the above solution, a reinforcing plate is installed in the thermal management component, which can improve the structural strength of the thermal management component. At the same time, a part of the connector is pressed against the side of the reinforcing plate away from the thermal management component, and the other part passes through the reinforcing plate and the thermal management component and is connected to the housing. The connector is used to connect the reinforcing plate, the thermal management component and the housing. On the one hand, the reinforcing plate can improve the strength of the connection part of the thermal management component used to connect to the housing, reducing the risk of crushing at the connection part. On the other hand, it also helps to simplify the structure of the battery device and reduce the assembly difficulty of the battery device.

[0014] In some embodiments, the second plate has a receiving groove formed on the side opposite to the first plate along a third direction, and the receiving groove is separated from the heat exchange channel; at least a portion of the reinforcing plate is located in the receiving groove, and a portion of the connector passes through the bottom wall of the reinforcing plate and the receiving groove.

[0015] In the above scheme, at least a portion of the reinforcing plate is disposed in the receiving groove so that the reinforcing plate can be accommodated by the receiving cavity. This helps to reduce the risk of interference between the reinforcing plate and other structures and improves the space utilization rate within the battery device.

[0016] In some embodiments, the battery device further includes a housing, which includes a first limiting beam and a second limiting beam spaced apart along a first direction, and a battery cell assembly disposed between the first limiting beam and the second limiting beam; a thermal management assembly is connected to the first limiting beam and the second limiting beam respectively, and the connection portion is located at the end of the heat exchange channel along the first direction.

[0017] In the above scheme, the thermal management component is connected to the first limiting beam and the second limiting beam respectively. The first and second limiting beams can support and limit the thermal management component from both sides, which helps to improve the stability of the thermal management component. The connection points between the thermal management component and the first and second limiting beams are located at the ends of the heat exchange channel along the first direction. These connection points can be located at the connection between the heat exchange channel and the manifold channel. By adjusting the size of the connection points, the flow rate of the heat exchange medium distributed from the manifold channel to the heat exchange channel can be adjusted while improving the connection reliability between the thermal management component and the limiting beams, thereby improving the heat exchange effect between the thermal management component and the battery cell.

[0018] In some embodiments, a battery cell includes electrode terminals, and a thermal management assembly is located on the side of the battery cell where the electrode terminals are located, with the electrode terminals situated in a hollowed-out portion. Specifically, in the thermal management assembly, a heat exchange plate is located between the electrode terminals of two adjacent battery cell assemblies. By utilizing the space between the electrode terminals of these two adjacent battery cell assemblies to arrange the heat exchange plate, the thermal management assembly's occupation of the lateral space of the battery cell along the first direction can be reduced, thereby helping to improve the space utilization rate of the battery device and increase the energy density of the battery device.

[0019] Meanwhile, the electrode terminals are located in the hollowed-out section, which is exposed relative to the thermal management components. This also facilitates the assembly of the electrode terminals with structures such as busbars, reduces assembly difficulty, and improves the assembly efficiency of the battery device.

[0020] In some embodiments, the battery cell also includes an explosion-proof valve located in the hollow portion, which can reduce the risk of the thermal management components affecting the pressure relief of the battery cell, thereby reducing the risk of thermal failure of the battery cell and further improving the reliability of the battery device.

[0021] In some embodiments, the heat exchange channel includes multiple sub-channels arranged along a second direction. The projection of the multiple sub-channels along a third direction covers at least a portion of two adjacent battery cell components to exchange heat with the adjacent battery cell components, thereby helping to improve the heat exchange efficiency between the thermal management component and each battery cell component.

[0022] In some embodiments, the thermal management component is bonded to the end face of the battery cell along a third direction to further improve the stability of the thermal management component.

[0023] In some embodiments, the battery device further includes a plurality of busbars and a wiring harness connected to the busbars, the busbars being electrically connected to electrode terminals; a first plate corresponding to at least a portion of the second current collecting channel is spaced apart from the battery cell and forms a first wiring harness channel for the wiring harness to pass through.

[0024] In the above solution, the wire harness electrically connected to the busbar can pass through the cutout portion via the first wire harness channel, thereby helping to shorten the length of the wire harness and save costs. At the same time, when the wire harness passes through the first wire harness channel, the inner wall of the first wire harness channel can also constrain the wire harness to a certain extent, improving the stability of the wire harness and further enhancing the reliability of the battery device.

[0025] In some embodiments, along a first direction, the portion of the first plate corresponding to the second current collector channel is spaced apart from the battery cell and forms at least a portion of the first wiring harness channel, thereby reducing the fabrication difficulty of the first wiring harness channel and improving the production efficiency of the battery device.

[0026] In some embodiments, the battery cell further includes a housing, the housing including a casing and an end cap disposed on one side of the casing along a third direction, an electrode terminal disposed on the end cap, and along the third direction, a portion of the first plate corresponding to the second current collector channel is spaced apart from the end cap and forms at least a portion of the first wiring harness channel, thereby reducing the fabrication difficulty of the first wiring harness channel and improving the production efficiency of the battery device.

[0027] In some embodiments, the battery device further includes a housing, the housing including a first limiting beam located on the side of the battery cell assembly near the second current collector channel along a first direction. A thermal management component, projected along a third direction, covers at least a portion of the first limiting beam. Along the third direction, a second wiring harness channel is formed between the thermal management component and the first limiting beam, and the second wiring harness channel communicates with the first wiring harness channel. After passing through the first wiring harness channel, the wiring harness can pass approximately directly through the second wiring harness channel along the first direction and extend to the side of the first limiting beam away from the battery cell assembly along the first direction, without needing to bend and extend from the side of the battery cell, thereby helping to further shorten the length of the wiring harness.

[0028] In some embodiments, the battery device further includes a battery management system disposed along a first direction on the side of the first limiting beam away from the battery cell assembly, and the wiring harness is electrically connected to the battery management system.

[0029] In the above scheme, the battery management system is located on the side of the first limiting beam away from the battery cell assembly along the first direction. Therefore, after the wiring harness passes through the first wiring harness channel and the second wiring harness channel, it can be directly electrically connected to the battery management system on the side of the first limiting beam away from the battery cell along the first direction, which helps to further shorten the length of the wiring harness.

[0030] In some embodiments, the thermal management component further includes an inlet and an outlet, both of which are connected to the second current collection channel. The battery device also includes a circuit breaker; along a first direction, the circuit breaker is located on the side of the second current collection channel away from the first current collection channel; or, along the first direction, the circuit breaker is located on the side of the first current collection channel away from the second current collection channel.

[0031] In the above scheme, placing the circuit breaker on the side of the second current collector channel away from the first current collector channel along the first direction can shorten the distance between the circuit breaker and the inlet and outlet, which is beneficial for heat exchange between the thermal management component and the circuit breaker. Alternatively, placing the circuit breaker on the side of the first current collector channel away from the second current collector channel can reduce the mutual influence between the circuit breaker and the thermal management component. For example, it can reduce the impact of the heat generated by the circuit breaker during operation on the heat exchange medium in the thermal management component, which is beneficial for improving the heat exchange effect between the thermal management component and the battery cells.

[0032] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy.

[0033] The electrical device provided in this application embodiment has the same technical effect as the battery provided in the above embodiment, and will not be described again here. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded view of the battery device according to some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4 This is an exploded structural diagram of the thermal management components of some embodiments of this application; Figure 5 yes Figure 4 A magnified view of a section at point AA; Figure 6 This is a top view of a thermal management component according to some embodiments of this application; Figure 7 This is another exploded structural diagram of the battery device according to some embodiments of this application; Figure 8 This is a top view of a battery device according to some embodiments of this application; Figure 9 This is another top view of a battery device according to some embodiments of this application; Figure 10 yes Figure 9 A magnified view of the area at CC; Figure 11 yes Figure 9 Schematic diagram of the cross section at point BB; Figure 12 yes Figure 11 A magnified view of the area at DD; Figure 13 This is another top view of a battery device according to some embodiments of this application.

[0036] Explanation of reference numerals in the attached figures: Vehicles 1000; Controllers 200; Motors 300; Battery assembly 100; housing 10; first part 101; second part 102; first limiting beam 103; second limiting beam 104; battery cell assembly 20; battery cell 21; electrode assembly 211; outer shell 212; end cap 2121; housing 2122; electrode terminal 213; explosion-proof valve 214; thermal management assembly 30; first plate 301; second plate 302; first groove 303; heat exchange channel 304; flow collection channel 305; hollow part 306; first flow collection channel 307; second flow collection channel 308; heat exchange plate part 309; flow collection plate part 310; first flow collection plate part 311; second flow collection plate part 312; First sub-channel 313; Second sub-channel 314; Liquid inlet 315; Liquid outlet 316; First heat exchange channel 317; Intermediate heat exchange channel 304; Second heat exchange channel 319; First sub-channel 320; Second sub-channel 321; Connecting sub-channel 322; First heat exchange plate section 323; Intermediate heat exchange plate section 324; Second heat exchange plate section 325; Second groove 326; Receiving groove 327; First wire harness channel 328; Second wire harness channel 329; Reinforcing plate 40; Connector 50; Busbar 60; Wire harness 70; Battery management system 80; Circuit breaker 90; First direction X; Second direction Y; Third direction Z. Detailed Implementation

[0037] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0043] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] In this application, "multiple" means two or more (including two).

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.).

[0056] 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.

[0057] 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.

[0058] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0059] 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.).

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0070] In some implementations, the electrode assembly is a stacked structure.

[0071] Multiple positive and negative electrodes can be set separately, and multiple positive and multiple negative electrodes can be stacked alternately.

[0072] 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.

[0073] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0074] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0075] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0076] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0077] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0078] The battery device includes a thermal management component for regulating the temperature of individual battery cells to ensure they operate within a suitable temperature range. In related technologies, the thermal management component often has multiple heat exchange channels, with perforations between adjacent channels. One end of each perforation is open, forming a roughly comb-like thermal management component. However, this type of component is prone to deformation during transportation, thus affecting the reliability of the battery device.

[0079] In view of this, this application provides a battery device in which a first plate and a second plate are stacked along a third direction. A first groove is provided on the side of the second plate facing the first plate, so that the inner walls of the first plate and the first groove enclose a heat exchange channel and a current collection channel. This not only helps to increase the heat exchange area and improve the efficiency of heat exchange between the thermal management component and the battery cells, but also facilitates the production and fabrication of the thermal management component. The thermal management component includes multiple heat exchange channels arranged along a second direction to exchange heat with multiple battery cell assemblies arranged along the second direction. Furthermore, the multiple heat exchange channels extend along a first direction, thus exchanging heat with the multiple battery cells stacked along the first direction in each battery cell assembly through each heat exchange channel, thereby achieving temperature regulation of each battery cell. A hollow section is formed between two adjacent heat exchange channels. The flow collection channel includes a first flow collection channel and a second flow collection channel. The first flow collection channel and the second flow collection channel are respectively arranged at both ends of the heat exchange channels along the first direction. The flow collection channel extends along the second direction. One flow collection channel connects at least two heat exchange channels. Therefore, through the two parts of the first plate and the second plate used to form the first flow collection channel and the second flow collection channel, the parts of the first plate and the second plate used to form at least two heat exchange channels can be connected and fixed from both ends, which helps to improve the structural strength of the thermal management component, reduce the risk of deformation of the thermal management component during transportation, and improve the reliability of the battery device.

[0080] The technical solutions described in the embodiments of this application are applicable to electrode assemblies, battery cells including electrode elements, batteries including battery cells, and electrical devices using batteries.

[0081] 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.

[0082] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0083] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 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 provided 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.

[0084] 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.

[0085] Please refer to Figure 2 , Figure 2This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 21. In some embodiments, the housing 10 may include a first portion 101 and a second portion 102, which overlap each other, and together define a receiving cavity for accommodating the battery cell 21. The second portion 102 may be a hollow structure with one open end, and the first portion 101 may be a plate-like structure, with the first portion 101 covering the open side of the second portion 102 so that the first portion 101 and the second portion 102 together define the receiving cavity; the first portion 101 and the second portion 102 may also be hollow structures, both open on one side, with the open side of the first portion 101 covering the open side of the second portion 102. Either the first portion 101 and the second portion 102 may include a base plate, and at least one of the first portion 101 and the second portion 102 may include a frame. Of course, the battery box formed by the first part 101 and the second part 102 can be of various shapes, such as cylinder, cuboid, etc.

[0086] In the battery device 100, there can be multiple battery cells 21, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 21 are connected in both series and parallel configurations. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 21 is housed within the housing 10. Alternatively, the battery device 100 can also be in the form of multiple battery cells 21 first connected in series, parallel, or in a mixed manner to form battery modules, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar for electrical connection between the multiple battery cells 21.

[0087] Each battery cell 21 can be a secondary battery cell 21 or a primary battery cell 21; it can also be a lithium-sulfur battery cell 21, a sodium-ion battery cell 21, or a magnesium-ion battery cell 21, but is not limited to these. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes.

[0088] Figure 3This is an exploded structural diagram of a battery cell 21 according to some embodiments of this application. The battery cell 21 includes an electrode assembly 211 and a housing 212. The housing 212 includes an end cap 2121 and a casing 2122. The end cap 2121 is a component that covers the opening of the casing 2122 to isolate the internal environment of the battery cell 21 from the external environment. Indiscriminately, the shape of the end cap 2121 can be adapted to the shape of the casing 2122 to fit the casing 2122. Optionally, the end cap 2121 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 2121 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 213 can be provided on the end cap 2121. The electrode terminals 213 can be used to electrically connect to the electrode assembly 211 for outputting or inputting electrical energy into the battery cell 21.

[0089] In some embodiments, the end cap 2121 may also be provided with an explosion-proof valve 214 for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. The end cap 2121 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 member may also be provided on the inner side of the end cap 2121. The insulating member can be used to isolate the electrical connection components within the housing 2122 from the end cap 2121 to reduce the risk of short circuits. For example, the insulating member can be plastic, rubber, etc.

[0090] Please refer to the reference. Figures 2 to 6This application provides a battery device 100, including a plurality of battery cell assemblies 20 and a thermal management assembly 30. Each battery cell assembly 20 includes a plurality of battery cells 21 stacked along a first direction X, and the plurality of battery cell assemblies 20 are arranged along a second direction Y. The thermal management assembly 30 is disposed on one side of the battery cell assembly 20 along a third direction Z. The thermal management assembly 30 includes a first plate 301 and a second plate 302 stacked along the third direction Z. The first plate 301 is located on the side of the second plate 302 facing the battery cell assembly 20, and the side of the second plate 302 facing the first plate 301 has a first groove 303. The inner walls of the first plate 301 and the first groove 303 enclose the first plate 301. A heat exchange channel 304 and a flow collection channel 305 are formed. The heat management component 30 includes multiple heat exchange channels 304, which are arranged along the second direction Y and extend along the first direction X. A hollow portion 306 is formed between adjacent heat exchange channels 304. The flow collection channel 305 includes a first flow collection channel 307 and a second flow collection channel 308. The first flow collection channel 307 and the second flow collection channel 308 are respectively arranged at both ends of the heat exchange channels 304 along the first direction X. The flow collection channel 305 extends along the second direction Y and connects at least two heat exchange channels 304. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0091] The battery cell 21 is the basic unit for storing and releasing electrical energy in the battery device 100. The battery cell assembly 20 is a combination structure formed by stacking multiple battery cells 21 along a first direction X. In the battery device 100, there are multiple battery cell assemblies 20, and each battery cell assembly 20 is arranged along a second direction Y.

[0092] The thermal management component 30 can exchange heat with the battery cell 21 to remove the heat generated by the battery cell 21 during operation, or to raise the temperature of the battery cell 21 in a low-temperature environment to improve the efficiency of the battery cell 21. The thermal management component 30 is located on the side of the battery cell assembly 20 along the third direction Z to exchange heat with the battery cells 21 in the battery cell assembly 20.

[0093] The thermal management component 30 includes a first plate 301 and a second plate 302 stacked along a third direction Z. Along the third direction Z, the first plate 301 is located on the side of the second plate 302 facing the battery cell assembly 20. The first plate 301 can be a flat plate or a shaped plate. The second plate 302 is a shaped plate, and a first groove 303 is provided on its side facing the first plate 301. The first plate 301 can be connected to the second plate 302, for example, by brazing. This allows the inner walls of the first plate 301 and the first groove 303 to enclose a heat exchange channel 304 and a current collection channel 305, which helps to increase the heat exchange area, improve the efficiency of heat exchange between the thermal management component 30 and the battery cell 21, and facilitates the production and fabrication of the thermal management component 30.

[0094] The thermal management component 30 may include a heat exchange plate portion 309 and a flow collector portion 310. The heat exchange plate portion 309 encloses and forms a heat exchange channel 304. The heat exchange plate portion 309 may include portions of the first plate 301 and the second plate 302 used to form the heat exchange channel 304. The flow collector portion 310 encloses and forms a flow collection channel 305. It may include portions of the first plate 301 and the second plate 302 used to form the flow collection channel 305. The heat exchange plate portion 309 and the flow collector portion 310 are interconnected to facilitate the communication between the heat exchange channel 304 and the flow collection channel 305.

[0095] The heat exchange channel 304 is a channel through which the heat exchange medium flows and achieves heat exchange. In the thermal management assembly 30, there are multiple heat exchange channels 304, which can be arranged along the second direction Y and extend along the first direction X. Therefore, the heat exchange medium in each heat exchange channel 304 can exchange heat with each battery cell 21 stacked along the first direction X in each battery cell assembly 20, thereby regulating the temperature of each battery cell 21. There are various correspondences between the heat exchange channels 304 and each battery cell assembly 20. For example, each heat exchange channel 304 can be set one-to-one with each battery cell assembly 20, with the heat exchange medium in one heat exchange channel 304 used to exchange heat with one battery cell 21 in one battery cell assembly 20. Alternatively, the heat exchange medium in multiple heat exchange channels 304 can simultaneously exchange heat with the battery cells 21 in one battery cell assembly 20, and the heat exchange medium in one heat exchange channel 304 can simultaneously exchange heat with the battery cells 21 in at least two battery cell assemblies 20. The heat exchange channel 304 can extend along a first direction X, and the heat exchange medium therein can exchange heat with each battery cell 21 in the corresponding battery cell assembly 20.

[0096] Correspondingly, there can be multiple heat exchange plate sections 309, which can be arranged along the second direction Y. A heat exchange channel 304 can be formed in each heat exchange plate section 309. Multiple heat exchange plate sections 309 can be arranged at intervals along the second direction Y to form a hollow section 306 between adjacent heat exchange channels 304.

[0097] The manifold 305 is a channel for collecting or distributing heat exchange media among multiple heat exchange channels 304. In the thermal management assembly 30, there can be multiple manifolds 305, including a first manifold 307 and a second manifold 308. The first manifold 307 and the second manifold 308 are respectively located at both ends of the heat exchange channels 304 along the first direction X, and both extend along the second direction Y. Therefore, at both ends of the heat exchange channels 304 along the first direction X, the first manifold 307 and the second manifold 308 can communicate with at least two heat exchange channels 304 to collect or coordinate the heat exchange media among these at least two heat exchange channels 304. There are various arrangements of the first manifold 307 and the second manifold 308. For example, one end of each heat exchange channel 304 in the thermal management component 30 is connected to the first manifold 307, and the other end of each heat exchange channel 304 is connected to the second manifold 308. Alternatively, some of the heat exchange channels 304 connected to the first manifold 307 may not be connected to the second manifold 308, and some of the heat exchange channels 304 connected to the second manifold 308 may not be connected to the first manifold 307.

[0098] Correspondingly, there may be multiple collector plates 310. Multiple collector plates 310 may include a first collector plate 311 and a second collector plate 312. The first collector plate 311 encloses to form a first collector channel 307, and the second collector plate 312 encloses to form a second collector channel 308. The first collector plate 311 and the second collector plate 312 are located on both sides of the heat exchange plate 309 along the first direction X.

[0099] In this embodiment, by providing a first collecting channel 307 and a second collecting channel 308 at both ends of the heat exchange channel 304 along the first direction X, and by using the first collecting plate portion 311 forming the first collecting channel 307 and the second collecting plate portion 312 forming the second collecting channel 308, at least two heat exchange plate portions 309 forming at least two heat exchange channels 304 are connected and fixed from both ends, thereby helping to improve the structural strength of the thermal management component 30, reducing the risk of deformation of the thermal management component 30 during transportation, and improving the reliability of the battery device 100.

[0100] like Figure 6As shown, in some embodiments, the second flow channel 308 includes a first sub-channel 313 and a second sub-channel 314 that are isolated from each other. The first sub-channel 313 and the second sub-channel 314 are spaced apart along the second direction Y. The first sub-channel 313 and the second sub-channel 314 are respectively connected to multiple heat exchange channels 304.

[0101] Both the first sub-channel 313 and the second sub-channel 314 are enclosed by the second manifold portion 312. The first sub-channel 313 and the second sub-channel 314 are both located on the same side of the heat exchange channel 304 along the first direction X, and are spaced apart along the second direction Y, so as to achieve mutual isolation between the first manifold channel 307 and the second manifold channel 308, so that the heat exchange medium does not flow directly between the first sub-channel 313 and the second sub-channel 314.

[0102] The first sub-channel 313 and the second sub-channel 314 are respectively connected to multiple heat exchange channels 304, which can realize the collection or distribution of heat exchange medium in the corresponding heat exchange channel 304, reduce mutual interference, and at the same time facilitate the control of the flow direction of heat exchange medium in each heat exchange channel 304, thereby improving the controllability and flexibility of the heat exchange medium.

[0103] In some examples, at least a portion of each heat exchange channel 304 connected to the first sub-channel 313 is connected to the first manifold 307, and at least a portion of each heat exchange channel 304 connected to the second sub-channel 314 is connected to the first manifold 307. Therefore, at least a portion of the heat exchange medium in the first sub-channel 313 can flow into the first manifold 307 via the heat exchange channel 304 between the first sub-channel 313 and the first manifold 307, and then flow into the second sub-channel 314 via the heat exchange channel 304 between the first manifold 307 and the second sub-channel 314.

[0104] In some examples, at least one heat exchange channel 304 may be connected to the first sub-channel 313 and the second sub-channel 314 at both ends, so that at least a portion of the heat exchange medium in the first sub-channel 313 may flow directly into the second sub-channel 314 via the at least one heat exchange channel 304.

[0105] like Figure 6 As shown, in some embodiments, the thermal management component 30 is further provided with an inlet 315 and an outlet 316, a first sub-channel 313 is connected to the inlet 315, and a second sub-channel 314 is connected to the outlet 316; at least a portion of each heat exchange channel 304 connected to the first sub-channel 313 is connected to the first collection channel 307, and at least a portion of each heat exchange channel 304 connected to the second sub-channel 314 is connected to the first collection channel 307.

[0106] Specifically, both the liquid inlet 315 and the liquid outlet 316 can be formed in the second manifold portion 312. The liquid inlet 315 is connected to the first sub-channel 313 for allowing the heat exchange medium to flow into the first sub-channel 313. The liquid outlet 316 is connected to the second sub-channel 314 for allowing the heat exchange medium to flow out. There can be one or more liquid inlets 315; when there are multiple liquid inlets 315, each liquid inlet 315 can be connected to the first sub-channel 313. Similarly, there can be one or more liquid outlets 316; when there are multiple liquid outlets 316, each liquid outlet 316 can be connected to the second sub-channel 314.

[0107] At least a portion of each heat exchange channel 304 connected to the first sub-channel 313 is connected to the first collection channel 307. Specifically, all heat exchange channels 304 connected to the first sub-channel 313 may be connected to the first collection channel 307; or, a portion of the heat exchange channels 304 connected to the first sub-channel 313 may be connected to the first collection channel 307, while another portion of the heat exchange channels 304 may not be connected to the first collection channel 307.

[0108] At least a portion of each heat exchange channel 304 connected to the second sub-channel 314 is connected to the first collection channel 307. Specifically, all heat exchange channels 304 connected to the second sub-channel 314 may be connected to the first collection channel 307; or, a portion of the heat exchange channels 304 connected to the second sub-channel 314 may be connected to the first collection channel 307, while another portion of the heat exchange channels 304 may not be connected to the first collection channel 307.

[0109] In the above scheme, the liquid inlet 315 is connected to the first sub-channel 313, and the liquid outlet 316 is connected to the second sub-channel 314. At least a portion of each heat exchange channel 304 connected to the first sub-channel 313 is connected to the first collection channel 307, and at least a portion of each heat exchange channel 304 connected to the second sub-channel 314 is connected to the first collection channel 307. Therefore, the heat exchange medium entering the first sub-channel 313 from the liquid inlet 315 can pass through the space between the first sub-channel 313 and the first collection channel 307. The heat exchange medium flows into the first collection channel 307 through the heat exchange channel 304. Under the collection or distribution function of the first collection channel 307, the medium flows into the second sub-channel 314 through the heat exchange channel 304 between the first collection channel 307 and the second sub-channel 314, and flows out from the outlet 316. This achieves unidirectional flow of the heat exchange medium, allowing it to exchange heat with the battery cell 21 during the flow process, thus achieving dynamic heat exchange and helping to improve the heat exchange effect between the thermal management component 30 and the battery cell 21.

[0110] like Figure 6As shown, in some embodiments, the multiple heat exchange channels 304 include a first heat exchange channel 317, an intermediate heat exchange channel 318, and a second heat exchange channel 319 arranged along the second direction Y. The intermediate heat exchange channel 318 includes a first sub-channel 320, a second sub-channel 321, and a connecting sub-channel 322. The first sub-channel 320 and the second sub-channel 321 both extend along the first direction X and are interconnected through the connecting sub-channel 322. The first sub-channel 320 is connected to the first sub-channel 313, and the second sub-channel 321 is connected to the second sub-channel 314.

[0111] The first heat exchange channel 317, the intermediate heat exchange channel 318, and the second heat exchange channel 319 are arranged at intervals along the second direction Y, with the intermediate heat exchange channel 318 located between the first heat exchange channel 317 and the second heat exchange channel 319. There can be multiple first heat exchange channels 317 and multiple second heat exchange channels 319, and the number of first heat exchange channels 317 and the number of second heat exchange channels 319 can be the same. Multiple first heat exchange channels 317 are arranged on one side of the intermediate heat exchange channel 318 along the second direction Y, and multiple second heat exchange channels 319 are arranged on the other side of the intermediate heat exchange channel 318 along the second direction Y.

[0112] Correspondingly, the plurality of heat exchanger plates 309 may include a first heat exchanger plate 323 for forming a first heat exchange channel 317, an intermediate heat exchanger plate 324 for forming an intermediate heat exchange channel 318, and a second heat exchanger plate 325 for forming a second heat exchange channel 319. The first heat exchanger plate 323, the intermediate heat exchanger plate 324, and the second heat exchanger plate 325 are arranged at intervals along the second direction Y, with the intermediate heat exchanger plate 324 located between the first heat exchanger plate 323 and the second heat exchanger plate 325. There may be multiple first heat exchanger plates 323 and multiple second heat exchanger plates 325, and the number of first heat exchanger plates 323 and the number of second heat exchanger plates 325 may be the same. Multiple first heat exchanger plates 323 are arranged on one side of the intermediate heat exchanger plate 324 along the second direction Y, and multiple second heat exchanger plates 325 are arranged on the other side of the intermediate heat exchanger plate 324 along the second direction Y.

[0113] The intermediate heat exchange channel 318 includes a first sub-channel 320, a second sub-channel 321, and a connecting sub-channel 322, all of which are formed in the intermediate heat exchange plate portion 324. The first sub-channel 320 and the second sub-channel 321 both extend along a first direction X. One end of the first sub-channel 320 is connected to the first sub-channel 313, and the other end is connected to the connecting sub-channel 322. One end of the second sub-channel 321 is connected to the second sub-channel 314, and the other end is connected to the end of the connecting sub-channel 322 away from the first sub-channel 320.

[0114] The number of first sub-channels 320 can be one or more, the number of second sub-channels 321 can be one or more, and the number of connecting sub-channels 322 can be one or more. For example, the number of first sub-channels 320, second sub-channels 321, and connecting sub-channels 322 are all two, wherein one first sub-channel 320 is connected to one second sub-channel 321 through one connecting sub-channel 322, and another first sub-channel 320 is connected to another second sub-channel 321 through another connecting sub-channel 322.

[0115] The portion of the heat exchange medium entering the first sub-channel 313 from the inlet 315 can flow sequentially through the first sub-channel 320, the connecting sub-channel 322, and the second sub-channel 321, enter the second sub-channel 314, and flow out from the outlet 316 without having to flow through the first collection channel 307. This reduces the energy loss of the heat exchange medium in the intermediate heat exchange channel 318 during the flow process, and improves the heat exchange effect between the heat exchange medium in the intermediate heat exchange channel 318 and the corresponding battery cell 21, while achieving dynamic heat exchange between the heat exchange medium and the battery cell 21.

[0116] It is known that the projection of the intermediate heat exchange channel 318 along the third direction Z can cover one or more battery cell components 20 at the center of each battery cell component 20 along the second direction Y. The battery cell 21 in the one or more battery cell components 20 at the center has the worst heat dissipation capacity during operation. Therefore, the above solution improves the heat exchange effect between the heat exchange medium in the intermediate heat exchange channel 318 and the battery cell component 20 at the center by reducing the energy loss of the heat exchange medium, thereby further improving the reliability of the battery device 100.

[0117] It should be noted that the shape of the connecting sub-channel 322 can be varied. For example, the connecting sub-channel 322 can extend along the second direction Y, or the connecting sub-channel 322 can be a curved or inclined channel.

[0118] Optionally, the two ends of the first heat exchange channel 317 can be connected to the first sub-channel 313 and the first collection channel 307 respectively, and the two ends of the second heat exchange channel 319 can be connected to the second sub-channel 314 and the second collection channel 308 respectively. The heat exchange medium flowing into the first sub-channel 313 from the liquid inlet 315 can flow into the second sub-channel 314 in sequence through the first heat exchange channel 317, the first collection channel 307 and the second heat exchange channel 319, and flow out from the liquid outlet 316, thereby realizing unidirectional dynamic heat exchange of the heat exchange medium, which helps to improve its heat exchange effect with each battery cell 21.

[0119] In some embodiments, along the second direction Y, the liquid inlet 315 is located at the end of the first sub-channel 313 away from the second sub-channel 314, and the liquid outlet 316 is located at the end of the second sub-channel 314 away from the first sub-channel 313. This helps to reduce the mutual influence between the heat exchange medium at the liquid inlet 315 and the liquid outlet 316, and improve the heat exchange effect between the heat exchange medium flowing in from the liquid inlet 315 and the battery cell 21.

[0120] like Figure 5 As shown, in some embodiments, a second groove 326 is provided on the side of the first plate 301 facing the second plate 302. In the third direction Z, the second groove 326 is disposed opposite to a part of the first groove 303 and surrounds to form a first flow collection channel 307. This helps to increase the depth of the first flow collection channel 307 in the third direction Z. When the width of the first flow collection channel 307 is fixed, it can improve the flow capacity of the first flow collection channel 307, increase the flow rate of the first flow collection channel 307, and thus improve the flow efficiency of the heat exchange medium in the first flow collection channel 307, thereby improving the heat exchange efficiency between the thermal management component 30 and the battery cell 21.

[0121] Optionally, the depth of the first current collection channel 307 along the third direction Z is greater than at least part of the depth of the second current collection channel 308 along the third direction Z, so as to improve the flow capacity of the first current collection channel 307, while allowing space on one or both sides of the second current collection channel 308 along the third direction Z for arranging other structures.

[0122] like Figure 7 As shown, in some embodiments, the battery device 100 further includes a housing 10, a reinforcing plate 40, and a connector 50. The battery cell assembly 20 and the thermal management assembly 30 are disposed within the housing 10. The reinforcing plate 40 is disposed on at least one side of the thermal management assembly 30. A portion of the connector 50 abuts against the side of the reinforcing plate 40 away from the thermal management assembly 30, and another portion passes through the reinforcing plate 40 and the thermal management assembly 30 and is connected to the housing 10.

[0123] The housing 10 may include a base plate and a frame, the frame being connected to the base plate and arranged circumferentially around the base plate. The housing 10 may also include a limiting beam, which is a structure used to limit deformation of the base plate and frame of the housing 10. The limiting beam can limit deformation of the housing 10 when thermal runaway of the battery cell 21 causes changes in internal pressure. One side of the limiting beam along the third direction Z can be connected to the base plate, and both ends of the limiting beam along the second direction Y can be respectively connected to corresponding parts of the frame.

[0124] The reinforcing plate 40 is a structure used to improve the structural strength of the thermal management assembly 30 and the connection stability between the thermal management assembly 30 and the housing 10. The reinforcing plate 40 can be provided on one side of the thermal management assembly 30 or on multiple sides of the thermal management assembly 30. For example, the reinforcing plate 40 can be provided on the side of the thermal management assembly 30 away from the battery cell 21 along the third direction Z.

[0125] The connector 50 is a structure used to achieve a stable connection between the reinforcing plate 40, the thermal management component 30, and the housing 10. Both the reinforcing plate 40 and the thermal management component 30 may have through holes through which the connector 50 passes. A portion of the connector 50 may press against the side of the reinforcing plate 40 away from the thermal management component 30, while another portion may pass through the through holes in both the reinforcing plate 40 and the thermal management component 30, and connect to the housing 10 on the side of the thermal management component 30 away from the reinforcing plate 40, thereby securing the reinforcing plate 40 to the thermal management component 30 and vice versa.

[0126] The connector 50 can lock the reinforcing plate 40 and the thermal management component 30 to any structure of the housing 10. For example, the reinforcing plate 40 and the thermal management component 30 can be locked to the limiting beam of the housing 10, or the reinforcing plate 40 and the thermal management component 30 can be locked to the frame of the housing 10. There can be multiple pairs of reinforcing plates 40 and connectors 50, and multiple connectors 50 can achieve locking connections between the reinforcing plate 40, the thermal management component 30, and the housing 10 at multiple locations. For example, multiple connectors 50 can respectively achieve locking connections between the reinforcing plate 40, the heat exchange plate portion 309, and the housing 10 at both ends of each heat exchange plate portion 309 along the first direction X. The connector 50 has various structures; for example, the connector 50 can be a bolt, a self-tapping screw, or a similar structure.

[0127] In the above scheme, a reinforcing plate 40 is provided in the thermal management component 30, which can improve the structural strength of the thermal management component 30. At the same time, a part of the connector 50 is pressed against the side of the reinforcing plate 40 away from the thermal management component 30, and the other part passes through the reinforcing plate 40 and the thermal management component 30 and is connected to the housing 10. The connector 50 is used to connect the reinforcing plate 40, the thermal management component 30 and the housing 10. On the one hand, the reinforcing plate 40 can improve the strength of the connection part of the thermal management component 30 used to connect with the housing 10, reducing the risk of crushing at the connection part. On the other hand, it also helps to simplify the structure of the battery device 100 and reduce the assembly difficulty of the battery device 100.

[0128] like Figure 7As shown, in some embodiments, the second plate 302 has a receiving groove 327 formed on the side opposite to the first plate 301 along the third direction Z, and the receiving groove 327 is separated from the heat exchange channel 304; at least a portion of the reinforcing plate 40 is located in the receiving groove 327, and a portion of the connector 50 passes through the bottom wall of the reinforcing plate 40 and the receiving groove 327.

[0129] A receiving groove 327 is formed on the side of the second plate 302 away from the first plate 301 along the third direction Z, and is separated from the first groove 303 by the second plate 302. The receiving groove 327 is located at the connection position between the reinforcing plate 40 and the thermal management assembly 30. For example, each heat exchange plate portion 309 may be provided with a receiving groove 327 at both ends along the first direction X.

[0130] At least a portion of the reinforcing plate 40 is located in the receiving groove 327 to accommodate the reinforcing plate 40 through the receiving cavity, which helps to reduce the risk of the reinforcing plate 40 interfering with other structures and improves the space utilization within the battery device 100.

[0131] A portion of the connector 50 can pass through the reinforcing plate 40, the bottom wall of the receiving groove 327, and the first plate 301 in the receiving groove 327, and be connected to the housing 10 to achieve a locking connection between the reinforcing plate 40, the second plate 302, the first plate 301, and the housing 10.

[0132] like Figure 7 As shown, in some embodiments, the battery device 100 further includes a housing 10, which includes a first limiting beam 103 and a second limiting beam 104 spaced apart along a first direction X. The battery cell assembly 20 is disposed between the first limiting beam 103 and the second limiting beam 104. The thermal management assembly 30 is connected to the first limiting beam 103 and the second limiting beam 104 respectively, and the connection is located at the end of the heat exchange channel 304 along the first direction X.

[0133] The first limiting beam 103 and the second limiting beam 104 are both structures designed to prevent deformation of the bottom plate and frame of the housing 10. The first limiting beam 103 and the second limiting beam 104 are respectively disposed on both sides of each battery cell assembly 20 along the first direction X. When the battery cell 21 in each battery cell assembly 20 experiences thermal runaway, causing a change in the internal pressure of the housing 10, the first limiting beam 103 and the second limiting beam 104 can effectively limit the deformation of the housing 10.

[0134] The thermal management component 30 is connected to the first limiting beam 103 and the second limiting beam 104 respectively, and the connection points are located at the ends of the heat exchange channel 304 along the first direction X. That is, the two ends of the heat exchange plate portion 309 along the first direction X can be fixedly connected to the first limiting beam 103 and the second limiting beam 104 respectively. In some examples, the two ends of the heat exchange plate portion 309 along the first direction X can be provided with receiving grooves 327 respectively. Each receiving groove 327 is provided with a reinforcing plate 40 and a connecting member 50. A portion of the connecting member 50 can pass through the reinforcing plate 40 and the bottom wall of the corresponding receiving groove 327 and be connected to the corresponding limiting beam.

[0135] There are several ways to connect the heat exchange plate portion 309 in the thermal management assembly 30 to the first limiting beam 103 and the second limiting beam 104. For example, all heat exchange plate portions 309 can be fixedly connected to the first limiting beam 103 and the second limiting beam 104 at both ends along the first direction X, respectively; or, a portion of the heat exchange plate portions 309 can be fixedly connected to the first limiting beam 103 and the second limiting beam 104 at both ends along the first direction X, while the remaining heat exchange plate portions 309 are not fixedly connected to the first limiting beam 103 and the second limiting beam 104; or, a portion of the heat exchange plate portions 309 can be fixedly connected to the first limiting beam 103 at one end along the first direction X, while another portion of the heat exchange plate portions 309 is fixedly connected to the second limiting beam 104 at one end along the first direction X.

[0136] In the above scheme, the thermal management component 30 is connected to the first limiting beam 103 and the second limiting beam 104 respectively. The first limiting beam 103 and the second limiting beam 104 can support and limit the thermal management component 30 from both sides, which helps to improve the stability of the thermal management component 30. The connection points between the thermal management component 30 and the first limiting beam 103 and the second limiting beam 104 are located at the ends of the heat exchange channel 304 along the first direction X. The connection points can be located at the connection between the heat exchange channel 304 and the collection channel 305. By adjusting the size of the connection points, the flow rate of the heat exchange medium distributed from the collection channel 305 to the heat exchange channel 304 can be adjusted while improving the connection reliability between the thermal management component 30 and the limiting beams, thereby improving the heat exchange effect between the thermal management component 30 and the battery cell 21.

[0137] like Figure 3 and Figure 8 As shown, in some embodiments, the battery cell 21 includes an electrode terminal 213, and the thermal management component 30 is located on the side of the battery cell 21 where the electrode terminal 213 is located, with the electrode terminal 213 located in the hollow portion 306.

[0138] The electrode terminal 213 is located in the hollow portion 306, i.e., in the thermal management component 30. The heat exchange plate portion 309 is located between the electrode terminals 213 of two adjacent battery cell components 20. By utilizing the space between the electrode terminals 213 of the two adjacent battery cell components 20, the heat exchange plate portion 309 can be arranged, which can reduce the space occupied by the thermal management component 30 on the side space of the battery cell 21 along the first direction X, thereby helping to improve the space utilization of the battery device 100 and increase the energy density of the battery device 100.

[0139] Meanwhile, the electrode terminal 213 is located in the hollowed-out portion 306, and is exposed relative to the thermal management component 30. This facilitates the assembly of the electrode terminal 213 with structures such as the busbar 60, reduces assembly difficulty, and improves the assembly efficiency of the battery device 100.

[0140] like Figure 3 and Figure 8 As shown, in some embodiments, the battery cell 21 also includes an explosion-proof valve 214 located in the hollow portion 306, which can reduce the risk of the thermal management component 30 affecting the pressure relief of the battery cell 21, thereby reducing the risk of thermal failure of the battery cell 21 and further improving the reliability of the battery device 100.

[0141] In some embodiments, the heat exchange channel 304 includes multiple sub-channels arranged along a second direction Y. The projection of the multiple sub-channels along a third direction Z covers at least a portion of two adjacent battery cell components 20 to exchange heat with the adjacent battery cell components 20, which helps to improve the heat exchange efficiency between the thermal management component 30 and each battery cell component 20.

[0142] A heat exchange plate portion 309 may have multiple sub-channels, and the multiple sub-channels located in the same heat exchange plate portion 309 may constitute a heat exchange channel 304. A heat exchange plate portion 309 may be located between the electrode terminals 213 in two adjacent battery cell assemblies 20, and its projection along the third direction Z may simultaneously cover a portion of the two adjacent battery cell assemblies 20. In the heat exchange plate portion 309, the projection of a portion of the sub-channels along the third direction Z may cover a portion of one battery cell assembly 20, and the projection of another portion of the sub-channels along the third direction Z may cover a portion of another adjacent battery cell assembly 20.

[0143] In some embodiments, the thermal management component 30 is bonded to the end face of the battery cell 21 along the third direction Z to further improve the stability of the thermal management component 30.

[0144] For example, the first plate 301 of the thermal management assembly 30 can be bonded to the housing 212 of the battery cell 21 in the two adjacent battery cell assemblies 20 by structural adhesive between the electrode terminals 213 of the two adjacent battery cell assemblies 20.

[0145] like Figures 8-10 As shown, in some embodiments, the battery device 100 further includes a plurality of busbars 60 and a wiring harness 70 connected to the busbars 60, the busbars 60 being electrically connected to the electrode terminals 213; the first plate 301 is spaced apart from the battery cell 21 corresponding to at least a portion of the second current collection channel 308, and forms a first wiring harness channel 328 for the wiring harness 70 to pass through.

[0146] Busbar 60 is a conductive connection structure used to realize the series or parallel connection of multiple battery cells 21. In a battery cell assembly 20, adjacent battery cells 21 can be electrically connected through busbar 60. The electrode terminals 213 of the battery cells 21 are located in the cutout portion 306 and exposed through the cutout portion 306 to facilitate electrical connection with busbar 60. When busbar 60 is electrically connected to the electrode terminal 213, the projection of busbar 60 along the third direction Z can cover the corresponding electrode terminal 213.

[0147] The wiring harness 70 can be a sampling wiring harness 70 or other types of wiring harness 70. One battery cell assembly 20 can correspond to multiple wiring harnesses 70. One end of each wiring harness 70 is electrically connected to each busbar 60, and the other end is used to electrically connect to the battery management system 80 and other structures. Each battery cell 21 of the battery cell assembly 20 can realize energy input and output through the corresponding busbar 60 and wiring harness 70.

[0148] In the thermal management assembly 30, the portion of the first plate 301 corresponding to the second current collector channel 308 is the second current collector plate portion 312. The second current collector plate portion 312 is spaced apart from the battery cell 21 to form the first wiring harness channel 328. The wiring harness 70 electrically connected to the busbar 60 can pass through the cutout portion 306 via the first wiring harness channel 328, thereby helping to shorten the length of the wiring harness 70 and save costs. At the same time, when the wiring harness 70 passes through the first wiring harness channel 328, the inner wall of the first wiring harness channel 328 can also constrain the wiring harness 70 to a certain extent, improving the stability of the wiring harness 70, thereby further improving the reliability of the battery device 100.

[0149] like Figure 10 As shown, in some embodiments, along the first direction X, the portion of the first plate 301 corresponding to the second current collector channel 308 is spaced apart from the battery cell 21 and forms at least a portion of the first wiring harness channel 328, thereby reducing the manufacturing difficulty of the first wiring harness channel 328 and improving the production efficiency of the battery device 100.

[0150] The first wiring harness channel 328 may be formed entirely by the second current collector portion 312 and the battery cell 21 spaced apart in the first direction X. Alternatively, a portion of the first wiring harness channel 328 may be formed by the second current collector portion 312 and the battery cell 21 spaced apart in the first direction X, and another portion may be formed by the second current collector portion 312 and the battery cell 21 spaced apart in other directions.

[0151] In some embodiments, the battery cell 21 further includes a housing 212, the housing 212 including a shell 2122 and an end cap 2121 disposed on the shell 2122 along the third direction Z. An electrode terminal 213 is disposed on the end cap 2121. Along the third direction Z, a portion of the first plate 301 corresponding to the second current collection channel 308 is spaced apart from the end cap 2121 and forms at least a portion of the first wire harness channel 328, thereby reducing the manufacturing difficulty of the first wire harness channel 328 and improving the production efficiency of the battery device 100.

[0152] Optionally, a portion of the first wiring harness channel 328 may be located between the second current collector portion 312 and the battery cell 21 along the first direction X, and another portion may be located between the second current collector portion 312 and the end cap 2121 of the battery cell 21 along the third direction Z, so as to make full use of the empty space around the battery cell 21 to form the first wiring harness channel 328, increase the cross-sectional area of ​​the first wiring harness channel 328, thereby improving the space utilization rate within the battery device 100 while reducing the difficulty of the wiring harness 70 passing through the first wiring harness channel 328 and reducing the assembly difficulty of the battery device 100.

[0153] like Figure 11 and Figure 12 As shown, in some embodiments, the battery device 100 further includes a housing 10, which includes a first limiting beam 103. The first limiting beam 103 is located on the side of the battery cell assembly 20 along the first direction X near the second current collector channel 308. The projection of the thermal management assembly 30 along the third direction Z covers at least a portion of the first limiting beam 103. Along the third direction Z, a second wiring harness channel 329 is formed between the thermal management assembly 30 and the first limiting beam 103. The second wiring harness channel 329 communicates with the first wiring harness channel 328.

[0154] Specifically, the first limiting beam 103 and the second limiting beam 104 are respectively disposed on both sides of the battery cell assembly 20 along the first direction X. The first limiting beam 103 may be located on the side of the battery cell assembly 20 along the first direction X near the second current collector portion 312, and the second limiting beam 104 may be located on the side of the battery cell assembly 20 along the first direction X near the first current collector portion 311.

[0155] In the thermal management assembly 30, the projection of the second current collector portion 312 along the third direction Z can cover a portion of the first limiting beam 103. Simultaneously, the second current collector portion 312 can be spaced apart from the first limiting beam 103 along the third direction Z to form a second wiring harness channel 329. The second wiring harness channel 329 can be located along the first direction X on the side of the first wiring harness channel 328 away from the battery cell 21 and communicates with the first wiring harness channel 328. Therefore, after passing through the first wiring harness channel 328, the wiring harness 70 can pass approximately directly along the first direction X through the second wiring harness channel 329 and extend to the side of the first limiting beam 103 along the first direction X away from the battery cell assembly 20, without needing to bend and extend from the side of the battery cell 21, thereby helping to further shorten the length of the wiring harness 70.

[0156] It should be noted that there are multiple ways to form the second wire harness channel 329. For example, the second wire harness channel 329 can be formed by at least a portion of the second current collector plate portion 312 arching away from the first limiting beam 103, or the second wire harness channel 329 can be formed by the first limiting beam 103 being recessed away from the second current collector plate portion 312.

[0157] Optionally, a portion of the heat exchange plate portion 309 of the thermal management assembly 30 may be projected along the third direction Z to cover a portion of the first limiting beam 103 in order to facilitate a fixed connection with the first limiting beam 103.

[0158] Optionally, in the thermal management assembly 30, the projection of the first manifold portion 311 along the third direction Z can cover a portion of the second limiting beam 104, and the first manifold portion 311 and the second limiting beam 104 can be spaced apart along the third direction Z, and the distance between the first manifold portion 311 and the second limiting beam 104 along the third direction Z can be less than the distance between the second manifold portion 312 and the first limiting beam 103 along the third direction Z, so as to increase the depth of the first manifold channel 307 in the first manifold portion 311 in the third direction Z.

[0159] Optionally, a portion of the projection of the heat exchange plate portion 309 along the third direction Z may cover a portion of the second limiting beam 104 to facilitate a fixed connection with the second limiting beam 104.

[0160] like Figure 13 As shown, in some embodiments, the battery device 100 further includes a battery management system 80, which is disposed on the side of the first limiting beam 103 away from the battery cell assembly 20 along the first direction X, and the wiring harness 70 is electrically connected to the battery management system 80.

[0161] In the above scheme, the battery management system 80 is set on the side of the first limiting beam 103 away from the battery cell assembly 20 along the first direction X. Therefore, after the wiring harness 70 passes through the first wiring harness channel 328 and the second wiring harness channel 329, it can be directly electrically connected to the battery management system 80 on the side of the first limiting beam 103 away from the battery cell 21 along the first direction X, which helps to further shorten the length of the wiring harness 70.

[0162] Optionally, the first wiring harness channel 328 and the second wiring harness channel 329 are also used for the busbar 60 to pass through, so as to realize series or parallel connection between adjacent battery cell components 20.

[0163] like Figure 13 As shown, in some embodiments, the thermal management component 30 is further provided with an inlet 315 and an outlet 316, both of which are connected to the second current collection channel 308. The battery device 100 also includes a circuit breaker 90. The circuit breaker 90 is a protective device that promptly cuts off the current when an abnormal current occurs in the battery device 100. Optionally, the circuit breaker 90 may integrate various structures such as a high-voltage box.

[0164] like Figure 13 As shown, in some embodiments, along the first direction X, the circuit breaker 90 is located on the side of the second current collection channel 308 away from the first current collection channel 307, which can shorten the distance between the circuit breaker 90 and the liquid inlet 315 and the liquid outlet 316, and facilitate heat exchange between the thermal management component 30 and the circuit breaker 90.

[0165] Optionally, the circuit breaker 90 and the battery management system 80 may both be located on the side of the first limiting beam 103 away from the battery cell assembly 20 along the first direction X, so as to facilitate electrical connection and signal exchange between the circuit breaker 90 and the battery management system 80. Optionally, the battery management system 80 may be located on one side of the circuit breaker 90.

[0166] In some other embodiments, along the first direction X, the circuit breaker 90 is located on the side of the first current collector channel 307 away from the second current collector channel 308. For example, the circuit breaker 90 may be located on the side of the second limiting beam 104 away from the battery cell assembly 20 along the first direction X, so as to reduce the mutual influence between the circuit breaker 90 and the thermal management assembly 30. For example, it can reduce the impact of the heat generated by the circuit breaker 90 during operation on the heat exchange medium in the thermal management assembly 30, which is beneficial to improving the heat exchange effect between the thermal management assembly 30 and the battery cell 21.

[0167] According to some embodiments of this application, this application provides a battery device 100, including a plurality of battery cell assemblies 20 and a thermal management assembly 30. Each battery cell assembly 20 includes a plurality of battery cells 21 stacked along a first direction X, and the plurality of battery cell assemblies 20 are arranged along a second direction Y. The thermal management assembly 30 is disposed on one side of the battery cell assembly 20 along a third direction Z. The thermal management assembly 30 includes a first plate 301 and a second plate 302 stacked along the third direction Z. The first plate 301 is located on the side of the second plate 302 facing the battery cell assembly 20, and the side of the second plate 302 facing the first plate 301 has a first groove 303. The first plate 301 and the first groove 303... The inner wall encloses and forms a heat exchange channel 304 and a flow collection channel 305. The heat management component 30 includes multiple heat exchange channels 304, which are arranged along the second direction Y and extend along the first direction X. A hollow portion 306 is formed between adjacent heat exchange channels 304. The flow collection channel 305 includes a first flow collection channel 307 and a second flow collection channel 308. The first flow collection channel 307 and the second flow collection channel 308 are respectively arranged at both ends of the heat exchange channels 304 along the first direction X. The flow collection channel 305 extends along the second direction Y and connects at least two heat exchange channels 304. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The second manifold 308 includes a first sub-channel 313 and a second sub-channel 314 that are isolated from each other. The first sub-channel 313 and the second sub-channel 314 are spaced apart along a second direction Y. The first sub-channel 313 and the second sub-channel 314 are respectively connected to multiple heat exchange channels 304. The thermal management component 30 is also provided with an inlet 315 and an outlet 316. The first sub-channel 313 is connected to the inlet 315, and the second sub-channel 314 is connected to the outlet 316. At least a portion of each heat exchange channel 304 connected to the first sub-channel 313 is connected to the first manifold 307, and at least a portion of each heat exchange channel 304 connected to the second sub-channel 314 is connected to the first manifold 307. The battery device 100 also includes a housing 10, which includes a first limiting beam 103 and a second limiting beam 104 spaced apart along a first direction X. A battery cell assembly 20 is disposed between the first limiting beam 103 and the second limiting beam 104. A thermal management assembly 30 is connected to the first limiting beam 103 and the second limiting beam 104, with the connection point located at the end of the heat exchange channel 304 along the first direction X. The battery cell 21 includes an electrode terminal 213, and the thermal management assembly 30 is located on the side of the battery cell 21 where the electrode terminal 213 is located. The electrode terminal 213 is located in the hollow portion 306.

[0168] This application also provides an electrical device, which includes the battery device 100 provided in the above embodiments. The battery device 100 is used to provide electrical energy. The electrical device provided in this application has the same technical effects as the battery device 100 provided in this application, and will not be described again here.

[0169] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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: Multiple battery cell assemblies, wherein the battery cell assembly includes multiple battery cells stacked along a first direction, and the multiple battery cell assemblies are arranged along a second direction; A thermal management component is disposed on one side of the battery cell assembly along a third direction. The thermal management component includes a first plate and a second plate stacked along the third direction. The first plate is located on the side of the second plate facing the battery cell assembly. The side of the second plate facing the first plate has a first groove. The inner walls of the first plate and the first groove enclose a heat exchange channel and a current collection channel. The thermal management component includes multiple heat exchange channels arranged along the second direction and extending along the first direction. A hollow portion is formed between adjacent heat exchange channels. The flow collection channel includes a first flow collection channel and a second flow collection channel. The first flow collection channel and the second flow collection channel are respectively arranged at both ends of the heat exchange channels along the first direction. The flow collection channel extends along the second direction. Each flow collection channel connects at least two heat exchange channels. The first direction, the second direction, and the third direction are mutually perpendicular.

2. The battery device according to claim 1, characterized in that, The second flow collection channel includes a first sub-channel and a second sub-channel that are isolated from each other. The first sub-channel and the second sub-channel are spaced apart along the second direction. The first sub-channel and the second sub-channel are respectively connected to multiple heat exchange channels.

3. The battery device according to claim 2, characterized in that, The thermal management component is further provided with a liquid inlet and a liquid outlet, the first sub-channel being connected to the liquid inlet and the second sub-channel being connected to the liquid outlet; At least a portion of each heat exchange channel connected to the first sub-channel is connected to the first collection channel, and at least a portion of each heat exchange channel connected to the second sub-channel is connected to the first collection channel.

4. The battery device according to claim 3, characterized in that, The multiple heat exchange channels include a first heat exchange channel, an intermediate heat exchange channel and a second heat exchange channel arranged along the second direction. The intermediate heat exchange channel includes a first sub-channel, a second sub-channel and a connecting sub-channel. Both the first sub-channel and the second sub-channel extend along the first direction and are interconnected through the connecting sub-channel. The first sub-channel is connected to the first sub-channel, and the second sub-channel is connected to the second sub-channel.

5. The battery device according to claim 3 or 4, characterized in that, Along the second direction, the inlet is located at the end of the first sub-channel away from the second sub-channel, and the outlet is located at the end of the second sub-channel away from the first sub-channel.

6. The battery device according to any one of claims 1-5, characterized in that, The first plate has a second groove on the side facing the second plate. In the third direction, the second groove is disposed opposite to a portion of the first groove and together forms the first flow channel.

7. The battery device according to any one of claims 1-6, characterized in that, The battery device also includes a housing, a reinforcing plate, and connectors, with the battery cell assembly and the thermal management assembly disposed within the housing. The reinforcing plate is disposed on the thermal management component. A portion of the connector abuts against the side of the reinforcing plate away from the thermal management component, and the other portion passes through the reinforcing plate and the thermal management component and is connected to the housing.

8. The battery device according to claim 7, characterized in that, The second plate has a receiving groove formed on the side opposite to the first plate along the third direction, and the receiving groove is separated from the heat exchange channel; At least a portion of the reinforcing plate is located in the receiving groove, and a portion of the connector passes through the reinforcing plate and the bottom wall of the receiving groove.

9. The battery device according to any one of claims 1-8, characterized in that, The battery device further includes a housing, the housing including a first limiting beam and a second limiting beam spaced apart along the first direction, and the battery cell assembly is disposed between the first limiting beam and the second limiting beam; The thermal management component is connected to the first limiting beam and the second limiting beam respectively, and the connection point is located at the end of the heat exchange channel along the first direction.

10. The battery device according to any one of claims 1-9, characterized in that, The battery cell includes electrode terminals, the thermal management component is located on the side of the battery cell where the electrode terminals are located, and the electrode terminals are located in the hollowed-out portion; and / or, The battery cell also includes an explosion-proof valve, which is located in the hollowed-out portion.

11. The battery device according to claim 10, characterized in that, The heat exchange channel includes multiple sub-channels arranged along the second direction. The projection of the multiple sub-channels along the third direction covers at least a portion of two adjacent battery cell assemblies to exchange heat with the adjacent battery cell assemblies.

12. The battery device according to claim 10 or 11, characterized in that, The thermal management component is bonded to the end face of the battery cell along the third direction.

13. The battery device according to any one of claims 10-12, characterized in that, The battery device also includes multiple busbars and wiring harnesses connected to the busbars, the busbars being electrically connected to the electrode terminals; The first plate is spaced apart from the battery cell at least in relation to the second current collecting channel, and forms a first wiring harness channel for the wiring harness to pass through.

14. The battery device according to claim 13, characterized in that, Along the first direction, the portion of the first plate corresponding to the second current collecting channel is spaced apart from the battery cell and forms at least a portion of the first wiring harness channel.

15. The battery device according to claim 13 or 14, characterized in that, The battery cell also includes a housing, the housing including a shell and an end cap disposed on one side of the shell along a third direction, the electrode terminal being disposed on the end cap. Along the third direction, the portion of the first plate corresponding to the second current collecting channel is spaced apart from the end cap and forms at least a portion of the first wiring harness channel.

16. The battery device according to any one of claims 13-15, characterized in that, The battery device further includes a housing, the housing including a first limiting beam, the first limiting beam being located on the side of the battery cell assembly closer to the second current collection channel along the first direction. The thermal management component's projection along the third direction covers at least a portion of the first limiting beam, and along the third direction, a second wiring harness channel is formed between the thermal management component and the first limiting beam, the second wiring harness channel communicating with the first wiring harness channel.

17. The battery device according to claim 16, characterized in that, The battery device further includes a battery management system, which is disposed on the side of the first limiting beam away from the battery cell assembly along the first direction, and the wiring harness is electrically connected to the battery management system.

18. The battery device according to any one of claims 1-17, characterized in that, The thermal management component is further provided with an inlet and an outlet, both of which are connected to the second current collection channel. The battery device also includes a circuit breaker. Along the first direction, the circuit breaker is located on the side of the second current collector channel away from the first current collector channel; or, Along the first direction, the circuit breaker is located on the side of the first current collector channel away from the second current collector channel.

19. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-18.

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