Battery device and electric device

Abstract

The invention provides a battery device and a power utilization device, and belongs to the technical field of new energy batteries. The battery device comprises at least one battery module, the battery module comprises a battery monomer assembly and a heat exchange plate, the battery monomer assembly comprises a plurality of battery monomers arranged along a first direction, the battery monomers are cylindrical, and the first direction is the axis direction of the battery monomers; the heat exchange plate is located on one side of the battery single body assembly, the heat exchange plate is provided with a first face, the first face is in heat conduction connection with the circumferential face of at least one battery single body, the first face is in an arc shape matched with the circumferential face, a first flow channel is formed in the heat exchange plate and used for containing a heat exchange medium, and the extending direction of the first flow channel is in the first direction. According to the battery device provided by the embodiment of the invention, the heat exchange efficiency between the heat exchange plate and the battery monomer assembly can be improved, and the use safety of the battery device is improved.

Description

Technical Field

[0001] This application belongs to the technical field of new energy batteries, and more specifically, relates to a battery device and an electrical device. Background Technology

[0002] Battery devices typically generate heat during use. When the temperature is too high, the internal side reactions of the battery will accelerate, affecting the battery's performance and lifespan. It also increases the risk of thermal runaway. Therefore, heat exchange devices are usually installed in battery devices to cool them down.

[0003] However, the cooling efficiency of the heat exchange devices in the relevant batteries needs to be further improved in order to cool down the batteries in a timely manner during the high-speed heat generation stage of battery assembly. Summary of the Invention

[0004] The purpose of this application is to provide a battery device and an electrical device that can improve the heat exchange efficiency between the heat exchange plate and the battery cell assembly.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a battery device is provided, which includes at least one battery module. The battery module includes a battery cell assembly and a heat exchange plate. The battery cell assembly includes a plurality of battery cells arranged along a first direction. The battery cells are cylindrical, and the first direction is the axial direction of the battery cells. The heat exchange plate is located on one side of the battery cell assembly. The heat exchange plate has a first surface that is thermally connected to the circumferential surface of at least one battery cell. The first surface is an arc shape adapted to the circumferential surface. A first flow channel is provided inside the heat exchange plate to accommodate a heat exchange medium. The extension direction of the first flow channel is along the first direction.

[0006] By adopting the above scheme, when the heat exchange medium passes through the first flow channel, the flow direction of the heat exchange medium is linear, the flow resistance is small, and the flow velocity is fast, which increases the convective heat transfer coefficient. This allows the heat exchange medium to maintain a large temperature difference with the battery cells throughout the flow process, thereby achieving better and more efficient heat exchange with the battery cell assembly and improving heat exchange efficiency. In addition, the battery cells are arranged along the axial direction, which means that the heat exchange plate does not need to be made in an S-shape to accommodate multiple battery cells. Instead, it can be made into a cylindrical or arc-shaped plate, thereby increasing the area of ​​the first surface, increasing the heat exchange area, and further improving heat exchange efficiency.

[0007] In some embodiments, within the same battery module, a heat exchange plate is thermally connected to each battery cell.

[0008] By adopting the above scheme, the heat exchange plate is thermally connected to each battery cell, so that when the heat exchange medium flows through the first flow channel, it can exchange heat with each battery cell at close range, thereby increasing the heat exchange efficiency.

[0009] In some embodiments, in a first direction, the size of the heat exchange plate is larger than the size of the battery cell assembly.

[0010] By adopting the above scheme, even for the battery cells at both ends of the battery cell assembly, the heat exchange plate can be close to them at various positions in the first direction, so as to achieve close-range heat exchange and improve heat exchange efficiency.

[0011] In some embodiments, multiple heat exchange plates are provided within a battery module along the circumferential direction of the battery cell assembly.

[0012] By adopting the above solution, each heat exchange plate can be independently assembled to the corresponding position in the circumferential direction of the battery cell assembly. When a heat exchange plate has a problem, only that heat exchange plate can be replaced or repaired, without having to remove or replace all the heat exchange plates as a whole, thus reducing maintenance costs.

[0013] In some embodiments, the coverage area of ​​each heat exchange plate in the circumferential direction of the battery cell assembly does not exceed 1 / 2 of the circumferential surface of the battery cell assembly.

[0014] By adopting the above scheme, the coverage area of ​​each heat exchange plate in the circumferential direction of the battery cell module does not exceed 1 / 2 of the circumferential surface of the battery cell module. This allows the heat exchange plates to be assembled with the battery cell module by directly attaching them radially, reducing the assembly difficulty between the heat exchange plates and the battery cell module. The arrangement of multiple heat exchange plates can compensate for the small heat exchange area of ​​a single heat exchange plate, ensuring that the total coverage area of ​​the multiple heat exchange plates on the circumferential surface of the battery cell module is guaranteed while facilitating assembly with the battery cell module, thereby improving heat exchange efficiency.

[0015] In some embodiments, the number of heat exchange plates is 2, and the coverage area of ​​each heat exchange plate in the circumferential direction of the battery cell assembly is not less than 1 / 3 of the circumferential surface of the battery cell assembly.

[0016] By adopting the above scheme, the coverage area of ​​each heat exchange plate in the circumferential direction of the battery cell module is controlled to be no less than 1 / 3 of the circumferential surface of the battery cell module, so that the coverage area of ​​a single heat exchange plate is large. In this case, even if only two heat exchange plates are set, the total coverage area of ​​the heat exchange plates on the battery cell module can be large. While reducing the number of heat exchange plates, the total coverage area of ​​the heat exchange plates on the battery cell module is guaranteed, thereby improving the heat exchange efficiency.

[0017] In some embodiments, the battery device further includes a main pipe and a pipe manifold. The main pipe is disposed on one side of the plurality of battery modules along a first direction. The pipe manifold has a main pipe connector and a plurality of first branch pipe connectors connected to each other. The main pipe connector is connected to the main pipe, and the plurality of first branch pipe connectors are connected to a plurality of heat exchange plates respectively. The pipe manifold is configured to distribute heat exchange medium to different heat exchange plates.

[0018] By adopting the above scheme, the main pipeline can be used to distribute or collect heat exchange media from the heat exchange plates of multiple battery modules, ultimately achieving efficient heat exchange for multiple battery modules. In this structure, the total inlet and / or outlet of the heat exchange media in the heat exchange plates of multiple battery modules is integrated into a single main pipeline. After multiple parts are integrally molded, they are assembled as a whole, simplifying the process. Furthermore, the pipeline's current collector not only serves as a diversion and collection mechanism but also acts as a support to fix the main pipeline, making the overall structure of the battery device stable and compact.

[0019] In some embodiments, a plurality of first ribs are provided in the heat exchange plate, each first rib extending along a first direction, and the plurality of first ribs are spaced apart along the circumferential direction of the battery cell assembly, so as to divide the space in the heat exchange plate into a plurality of first flow channels extending along the first direction.

[0020] By adopting the above scheme, the multiple first ribs can strengthen the heat exchange plate and prevent it from being deformed or damaged by the expansion of the battery cells. On the other hand, the multiple first ribs divide the space inside the heat exchange plate into multiple first flow channels arranged along the first direction. Even if the heat exchange medium is small, after it is distributed to multiple first flow channels, the battery cells can exchange heat with the medium in the first flow channels at close range at the positions of different first flow channels, reducing the local accumulation of heat exchange medium on the heat exchange plate and improving the temperature uniformity of different parts of the battery cells.

[0021] In some embodiments, the battery module further includes a first current collector, which is provided at least one end of the heat exchange plate along a first direction. The first current collector has a first current collection cavity that communicates with a plurality of first flow channels; the first current collector is configured to distribute heat exchange medium to the plurality of first flow channels.

[0022] By adopting the above scheme, the heat exchange medium in the external device can be distributed into multiple first flow channels after entering the first collection cavity, or the heat exchange medium flowing out from multiple first flow channels can be merged in the first collection cavity and then flow into the external device. This arrangement enables the integration of the heat exchange medium in the first flow channels when the heat exchange plate has multiple first flow channels, facilitating the convergence or diversion of the heat exchange medium within the heat exchange plate in multiple first flow channels, thereby facilitating the distribution of the heat exchange medium in multiple first flow channels.

[0023] In some embodiments, the battery cell includes a housing and an electrode assembly. The housing is configured as an annular columnar structure that is closed relative to the external environment. A first hole is formed in the middle of the annular columnar structure, and the electrode assembly is disposed around the hole wall of the first hole.

[0024] By setting the first hole, the heat inside the battery cell can be dissipated through the first hole, thereby improving the cooling effect on the battery cell.

[0025] In some embodiments, the battery module further includes a heat exchange tube, which is disposed in a first hole of at least one battery cell and is used to contain a heat exchange medium.

[0026] By adopting the above scheme, the heat exchange medium can carry away the heat of at least one battery cell during the flow of the heat exchange tube, thereby further improving the cooling effect on the battery cell assembly.

[0027] In some embodiments, a plurality of second ribs are provided inside the heat exchange tube, each second rib extending along a first direction to divide the space inside the heat exchange tube into a plurality of second flow channels extending along the first direction.

[0028] By adopting the above scheme, multiple second ribs can strengthen the heat exchange tube, preventing it from being deformed or damaged by the expansion of the battery cells. They can also divide the space inside the heat exchange tube into multiple second flow channels along the first direction. Even if the heat exchange medium is small, after distributing it to multiple second flow channels, the battery cells can exchange heat with the medium in the second flow channels at close range, reducing the local accumulation of heat exchange medium in the heat exchange tube and improving the temperature uniformity of different parts of the battery cells.

[0029] In some embodiments, the battery module further includes a second current collector, and the heat exchange tube is provided with a second current collector at at least one end along the first direction; The second manifold has a second manifold cavity, which is connected to multiple second flow channels; the second manifold is configured to distribute heat exchange medium to the multiple second flow channels.

[0030] By adopting the above scheme, the heat exchange medium in the external device enters the second manifold and can then be distributed into multiple second flow channels. Alternatively, the heat exchange medium flowing out from multiple second flow channels can converge in the second manifold and then flow into the external device. This arrangement enables the integration of the heat exchange medium in the second flow channels when the heat exchange tube has multiple flow channels, facilitating the convergence or diversion of the heat exchange medium within the heat exchange tube across multiple second flow channels, thereby simplifying the distribution of the heat exchange medium across multiple second flow channels.

[0031] In some embodiments, the battery device further includes a main pipe and a pipe manifold. The main pipe is located on one side of the battery module along a first direction. The pipe manifold has a main pipe connector, a first branch pipe connector, and a second branch pipe connector that are connected to each other. Both the first branch pipe connector and the second branch pipe connector are connected to the main pipe connector. The main pipe connector is connected to the main pipe. The first branch pipe connector is connected to the heat exchange plate. The second branch pipe connector is connected to the heat exchange tube.

[0032] By adopting the above scheme, the main pipeline can be used to distribute or collect heat exchange media from the heat exchange plates and tubes of multiple battery modules, ultimately achieving efficient heat exchange for multiple battery modules. In this structure, the total inlet and / or outlet of the heat exchange media from multiple battery modules is integrated into a single main pipeline. After multiple parts are integrally molded, the entire assembly is performed, simplifying the process. Furthermore, the pipeline's current collector not only serves as a diversion and collection mechanism but also acts as a support to fix the main pipeline, resulting in a stable and compact overall structure for the battery device.

[0033] In some embodiments, one end of the main pipeline is provided with a main pipeline port and the other end is provided with an exhaust valve. The main pipeline port is used to inject or discharge the heat exchange medium, and the exhaust valve is used to discharge the gas in the main pipeline.

[0034] By adopting the above solution, the probability of trapped air in the main pipeline can be reduced, the injection or discharge of heat exchange medium in the main pipeline can be increased, and the problems of abnormal noise and weakened heat exchange performance in the main pipeline caused by trapped air can be reduced.

[0035] In some embodiments, an explosion-proof valve is provided on the battery cell, the explosion-proof valve being configured to be actuated when the pressure inside the battery cell reaches a first threshold, the exhaust direction of the explosion-proof valve being radial along the battery cell; within a battery module, a heat exchange plate avoids at least a portion of the explosion-proof valve.

[0036] By adopting the above scheme, the exhaust direction of the explosion-proof valve is along the radial direction of the battery cell, thereby reducing the occurrence of the explosion-proof valve directly spraying gas onto adjacent battery cells in the same battery module, and reducing the thermal impact on adjacent battery cells. The exhaust direction of the heat exchange plate avoids the explosion-proof valve, allowing at least part of the gas discharged by the explosion-proof valve to be sprayed radially away from itself, rather than being trapped between the heat exchange plate and the battery cell, thus preventing the thermal runaway of the battery cell from being exacerbated.

[0037] In some embodiments, there are multiple battery modules, and at least two adjacent battery modules exist in the battery device, wherein the exhaust direction of the explosion-proof valve of one battery module is toward the heat exchange plate of the other battery module.

[0038] By adopting the above solution, when a cell in one battery module experiences thermal runaway, the emitted fumes will not directly affect the cells in another battery module, thereby slowing down the spread of thermal runaway.

[0039] In some embodiments, the battery device further includes a housing and a limiting frame; both the battery module and the limiting frame are disposed in the housing, and the limiting frame is provided with a limiting hole, through which the battery module passes along a first direction.

[0040] By adopting the above scheme, the battery module is inserted through the limiting hole along the first direction, so that the battery module can be limited by the limiting frame. As long as the position of the limiting hole on the limiting frame is fixed, the position of the battery module in the box is relatively fixed. During the use of the battery device, the probability of the battery module being displaced is small, which improves the stability of the mechanical structure and the stability of the electrical connection structure of the battery device.

[0041] In some embodiments, an explosion-proof valve is provided on the battery cell, and the explosion-proof valve is configured to be actuated when the pressure inside the battery cell reaches a first threshold; the edge of the limiting frame surrounding the first direction abuts against the inner wall of the box to divide the space inside the box into a plurality of independent first spaces, and at least one explosion-proof valve is provided in each first space.

[0042] By adopting the above solution, multiple explosion-proof valves of a battery module are isolated in different spaces by a limiting frame. When an explosion-proof valve emits smoke, the area affected by the smoke in the entire box is small, which can slow down the spread of thermal runaway and improve the safety of the battery device.

[0043] In some embodiments, a pressure relief mechanism is provided on the side wall of the enclosure corresponding to at least one first space. The pressure relief mechanism is actuated when the pressure in the corresponding first space reaches a second threshold.

[0044] By adopting the above scheme, when the explosion-proof valve in the first space equipped with the pressure relief mechanism emits smoke and the pressure in the first space reaches the second threshold, the pressure relief mechanism is activated to discharge the gas in the first space, preventing the gas pressure in the first space from continuing to rise and causing further heat spread, thereby improving the safety of the battery device.

[0045] In some embodiments, at least one limiting bracket is provided with a limiting claw, which is connected to the edge of the limiting hole and located on one side of the heat exchange plate along the first direction to limit the position of the heat exchange plate.

[0046] By adopting the above scheme, the limiting claw can restrict the position of the heat exchange plate in the first direction, thereby preventing the heat exchange plate from shifting along the first direction and keeping the heat exchange plate and the battery cell assembly relatively fixed in the first direction. With the relative positions of the heat exchange plate and the battery cell assembly already fixed, the limiting claw can also restrict the position of the entire battery module within the housing by limiting the position of the heat exchange plate.

[0047] In some embodiments, a sampling component is provided on the battery cell, and the heat exchange plate avoids at least a portion of the sampling component.

[0048] By adopting the above scheme, one or more performance indicators or environmental characteristics of a battery cell can be monitored during operation using a sampling component, enabling timely detection and adjustment of anomalies and reducing the occurrence of safety accidents. At least a portion of the heat exchange plate avoids the sampling component, allowing for smooth assembly of the sampling component with the battery cell and preventing the sampling component from affecting the heat exchange efficiency of the heat exchange plate.

[0049] In some embodiments, the battery cell assembly further includes a first insulating member that covers the circumferential surface of the battery cell, and at least a portion of the first insulating member is located between the heat exchange plate and the battery cell.

[0050] By adopting the above solution, the first insulating component prevents the heat exchange plate from making contact with the circumferential surface of the battery cell when the heat exchange plate is made of conductive material, thus avoiding contact with the circuit structure of the battery module. At the same time, it also protects the battery cell.

[0051] In some embodiments, the surface of the first insulating member facing the heat exchange plate has a plurality of grooves.

[0052] By adopting the above scheme, the groove makes the surface of the first insulating component facing the heat exchange plate uneven, thereby increasing the friction between the first insulating component and the heat exchange plate. This reduces the probability of positional displacement between the battery cell assembly and the heat exchange plate, improves the structural stability of the battery module, and reduces the risk of the heat exchange plate obstructing the exhaust of the explosion-proof valve or covering the sampling assembly due to positional displacement.

[0053] In some embodiments, the grooves are spaced apart along the circumferential direction of the circumferential surface of the battery cell.

[0054] By adopting the above solution, the first insulating component can play a better anti-slip role in the circumferential direction of the battery cell, preventing the battery cell assembly from rotating relative to the heat exchange plate, and improving the structural stability of the battery module.

[0055] In some embodiments, a first adhesive layer is provided between the heat exchange plate and the battery cell assembly, and the heat exchange plate and the battery cell assembly are connected through the first adhesive layer.

[0056] By adopting the above solution, relative displacement between the heat exchange plate and the battery cell assembly is further prevented, improving the structural stability of the battery module. With the concave-convex structure provided on the first insulating component, the structure can also accommodate a portion of the adhesive and increase the adhesion to the first adhesive layer, making the bond between the heat exchange plate and the battery cell assembly more robust and further improving the structural stability of the battery module.

[0057] In some embodiments, the first adhesive layer comprises a thermally conductive adhesive.

[0058] By adopting the above scheme, the first adhesive layer has a better thermal conductivity, which is beneficial to improving the heat exchange efficiency between the battery cell assembly and the heat exchange plate.

[0059] In some embodiments, the battery module further includes a retaining strap that surrounds the heat exchange plate and the battery cell assembly to bring the heat exchange plate and the battery cell assembly into contact.

[0060] By adopting the above solution, the fixing belt can fix the heat exchange plate and the battery cell assembly into a whole, reducing the probability of relative displacement between the two and improving the structural stability of the battery module.

[0061] Secondly, embodiments of this application provide an electrical device, which includes the battery device in any of the foregoing embodiments.

[0062] By adopting the above scheme, the battery device of the power device has a high heat exchange efficiency, which enables the electrochemical properties of the battery device to remain stable and good for a long time, resulting in high safety and a long service life. Attached Figure Description

[0063] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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 these drawings without creative effort.

[0064] Figure 1 This is a schematic diagram of the assembly of a battery cell and a heat exchange plate in a related technology.

[0065] Figure 2 This is a structural schematic diagram of a vehicle provided in an embodiment of this application.

[0066] Figure 3 This is a schematic diagram of the structure of the first type of battery device provided in the embodiments of this application.

[0067] Figure 4 This is a schematic diagram of the exploded structure of the first type of battery cell provided in the embodiments of this application.

[0068] Figure 5 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application.

[0069] Figure 6 This is an exploded view of a battery module provided in an embodiment of this application.

[0070] Figure 7 This is a cross-sectional view of a heat exchange plate provided in an embodiment of this application.

[0071] Figure 8 This is a side view of a battery module along a first direction, provided as an embodiment of this application, wherein the heat exchange plate is shown in a cut-open state.

[0072] Figure 9 This is a schematic diagram of the structure of two heat exchange plates provided in an embodiment of this application.

[0073] Figure 10 This is a schematic diagram of the structure of a heat exchange plate assembled with a first collector and a first connector, provided in an embodiment of this application.

[0074] Figure 11 This is a schematic diagram of the structure of a first current collector and a first connector assembly provided in an embodiment of this application.

[0075] Figure 12 for Figure 11 A schematic diagram of the structure along direction A.

[0076] Figure 13 This is a schematic diagram of the exploded structure of a second type of battery cell provided in an embodiment of this application.

[0077] Figure 14 This is an exploded structural diagram of a battery cell assembly provided in an embodiment of this application. The diagram only illustrates two battery cells as an example.

[0078] Figure 15 An exploded view of another battery module provided in an embodiment of this application.

[0079] Figure 16 This is a schematic diagram of the internal structure of a heat exchange tube provided in an embodiment of this application.

[0080] Figure 17 This is a schematic diagram of the assembly of a heat exchange tube, a second manifold, and a second connector, provided in an embodiment of this application.

[0081] Figure 18 This is a schematic diagram of the structure of a second current collector and a second connector assembly provided in an embodiment of this application.

[0082] Figure 19 for Figure 18A schematic diagram of the B-direction structure.

[0083] Figure 20 This is a schematic diagram of the exploded structure of a second type of battery device provided in an embodiment of this application.

[0084] Figure 21 This is a schematic diagram of a pipe manifold provided in an embodiment of this application.

[0085] Figure 22 This is a schematic diagram of a main pipe and a pipe manifold assembly provided in an embodiment of this application.

[0086] Figure 23 for Figure 20 Front view of the battery device shown.

[0087] Figure 24 This is a front view of a battery module provided in an embodiment of this application.

[0088] Figure 25 This is a front view of a battery device provided in an embodiment of this application.

[0089] Figure 26 This is an exploded schematic diagram of a battery device provided in an embodiment of this application.

[0090] Figure 27 This is a schematic diagram of a limiting frame provided in an embodiment of this application.

[0091] Figure 28 This is a schematic diagram of another limiting frame provided in an embodiment of this application.

[0092] Figure 29 This is a schematic diagram of a limiting frame and a battery module working together, provided in an embodiment of this application.

[0093] Figure 30 This is a view of another battery module along a first direction, provided as an embodiment of this application.

[0094] Figure 31 This is a schematic diagram of a sampling harness provided in an embodiment of this application.

[0095] Figure 32 for Figure 30 Enlarged diagram of point C in the middle.

[0096] Figure 33 This is an exploded structural diagram of another battery module provided in an embodiment of this application.

[0097] Figure 34 This is a schematic diagram of another battery module provided in an embodiment of this application.

[0098] The following are the labeling elements in the figure: Prior art reference numerals: 1310, battery cell; 200, liquid cooling plate.

[0099] Reference numerals in the accompanying drawings of the embodiments of this application: 01. Vehicle; 1000. Battery unit; 2000. Controller; 3000. Motor; 1100, Box body; 1110, Structural plate; 1120, First space; 1130, Pressure relief mechanism; 1200, Battery Module; 1210. Main pipeline; 1211. Main pipeline outlet; 1212. Air vent valve; 1220. Pipe manifold; 1221. Main pipe connector; 1222. First branch pipe connector; 1223. Second branch pipe connector 1230, Limiting bracket; 1231, Limiting hole; 1233, Limiting claw; 1240. Sampling component; 1241. Sampling terminal; 1242. Sampling harness; 1250, Fixing strap; 1300, Battery cell assembly; 1310, Battery cell; 1311, Housing; 1301, Shell; 1302, End cap; 1320, Electrode assembly; 1330, Tab; 1340, Electrode terminal; 1350, First hole; 1360, Explosion-proof valve; 1380, First insulating component; 1381, First adhesive layer; 1382, Groove; 1390, Second insulating component; 1391, Second adhesive layer; 1400, Heat exchange plate; 1401, First surface; 1410, First flow channel; 1420, First rib; 1500, First manifold; 1510, First manifold cavity; 1600, First Connector; 1700, heat exchange tube; 1710, second rib; 1720, second flow channel; 1800, Second manifold; 1810, Second manifold cavity; 1900, Second Connector; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0100] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0101] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0102] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0103] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0104] Battery devices often generate heat during use. With the increasing use of battery devices with fast charging performance and high energy density, the heat generation efficiency of battery devices is usually faster. Correspondingly, higher requirements are placed on the heat exchange efficiency of heat exchange devices.

[0105] The heat exchange efficiency of battery devices in related technologies sometimes fails to meet requirements. High temperatures accelerate side reactions during battery use, affecting the battery's electrical performance and lifespan, and also reducing battery safety.

[0106] A single battery cell is the basic unit that makes up a battery device. Battery cells can be cylindrical, flat, cuboid, or other shapes. Research has found that when battery cells are cylindrical, the heat exchange efficiency of the battery device is usually difficult to improve to a high level. This is because cylindrical battery cells only have approximately flat ends, while the circumference is non-planar. To approximate the circumference of multiple battery cells, such as… Figure 1 As shown, many battery devices typically employ an S-shaped liquid cooling plate 200, so that a recessed area on either side of the liquid cooling plate 200 contacts a portion of the circumferential surface of the battery cell 1310. Due to manufacturing and assembly limitations, the heat exchange area of ​​this liquid cooling plate 200 is restricted, preventing it from being widely deployed on the circumferential surface of the battery cell 1310, thus hindering a significant improvement in heat exchange efficiency. Furthermore, the flow channels within this liquid cooling plate 200 are also typically S-shaped, such as... Figure 1As shown in Figure M, under these circumstances, the cooling medium experiences greater frictional resistance and slower flow velocity as it flows through the channel. By the time the cooling medium reaches the downstream end of the channel, its temperature is already very high, making it difficult to exchange heat effectively with the downstream battery cells 1310. This results in lower overall heat exchange efficiency and a larger temperature difference between the multiple battery cells 1310 within the battery device.

[0107] In view of this, embodiments of this application provide a battery device, wherein each battery module includes a battery cell assembly and a heat exchange plate. Multiple cylindrical battery cells in the battery cell assembly are arranged along an axial direction. The heat exchange plate is adapted to the circumferential surface of the battery cell assembly. A first flow channel within the heat exchange plate extends along a first direction. Therefore, when the heat exchange medium passes through the first flow channel, the flow direction of the heat exchange medium is linear, resulting in lower flow resistance and higher flow velocity, thus increasing the convective heat transfer coefficient. This allows the heat exchange medium to maintain a large temperature difference with the battery cells throughout the flow process, thereby achieving better and more efficient heat exchange with the battery cell assembly and improving heat exchange efficiency. Furthermore, the battery cells are arranged along an axial direction, which eliminates the need for the heat exchange plate to be S-shaped to accommodate multiple battery cells. Instead, it can be made into a cylindrical or arc-shaped plate, thereby increasing the area of ​​the side of the heat exchange plate close to the battery cells, increasing the heat exchange area, and further improving heat exchange efficiency.

[0108] The battery device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0109] For ease of explanation, the following embodiments will be described using vehicle 01 as an example of an electrical device.

[0110] Please refer to Figure 2 , Figure 2This is a schematic diagram of the structure of a vehicle 01 provided in some embodiments of this application. The vehicle 01 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 1000 is installed inside the vehicle 01. The battery device 1000 can be located at the bottom, front, or rear of the vehicle 01. The battery device 1000 can be used to power the vehicle 01; for example, the battery device 1000 can serve as the operating power source for the vehicle 01. The vehicle 01 may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, to meet the power needs of the vehicle 01 during starting, navigation, and driving.

[0111] In some embodiments of this application, the battery device 1000 can not only serve as the operating power source for the vehicle 01, but also as the driving power source for the vehicle 01, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 01.

[0112] The battery device mentioned in the embodiments of this application may include one or more battery modules, and one or more battery cell modules for providing voltage and capacity. Each battery module includes a battery cell assembly, and a battery cell assembly may include multiple battery cells, which may be connected in series, parallel, or mixed connections.

[0113] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0114] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0115] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery device 1000 provided in some embodiments of this application. As an example, the battery device 1000 includes a housing 1100 and individual battery cells 1310, with multiple battery cells 1310 forming a battery cell assembly 1300 housed within the housing 1100. The housing 1100 provides space for the battery cells 1310, and the housing 1100 can adopt various structures.

[0116] like Figure 3As shown, in some embodiments, the housing 1100 includes multiple structural plates 1110. These structural plates 1110 are plate-like structures and can be made of steel plates, iron plates, rigid plastic plates, etc. The multiple structural plates 1110 can be fixed using methods such as cable ties, bolts, or snap-fits to define the space for accommodating the battery cells 1310. Depending on the number and structural requirements of the battery cells 1310, the space accommodating the battery cells 1310 can be a cuboid space, a cylindrical space, a prism space, etc.

[0117] In some embodiments, the housing 1100 can be part of the chassis structure of the vehicle 01. For example, a portion of the housing 1100 can be at least a part of the floor of the vehicle 01, or a portion of the housing 1100 can be at least a part of the crossbeams and longitudinal beams of the vehicle 01. In this embodiment, the battery cell 1310 can be a secondary battery, which refers to a battery cell 1310 that can be recharged to activate the active materials and continue to be used after being discharged.

[0118] The battery cell 1310 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0119] Please refer to Figure 4 , Figure 4 This is an exploded structural diagram of a battery cell 1310 provided in some embodiments of this application. The battery cell 1310 refers to the smallest unit that makes up a battery. Figure 3 As shown, the battery cell 1310 includes a housing 1311, an electrode assembly 1320, and other functional components.

[0120] Typically, the outer casing 1311 consists of a housing 1301 and an end cap 1302. The end cap 1302 is a component that covers the opening of the housing 1301 to isolate the internal environment of the battery cell 1310 from the external environment. The shape of the end cap 1302 can be adapted to the shape of the housing 1301 to fit it. Optionally, the end cap 1302 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 1302 is less prone to deformation under pressure and impact, giving the battery cell 1310 higher structural strength and improved safety performance. Functional components such as electrode terminals 1340 can be provided on the end cap 1302. The electrode terminals 1340 can be used for electrical connection with the electrode assembly 1320 to output or input electrical energy to the battery cell 1310.

[0121] The end cap 1302 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 structure may also be provided on the inner side of the end cap 1302. The insulating structure can be used to isolate the electrical connection components in the housing 1301 from the end cap 1302 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0122] The housing 1301 is a component used to cooperate with the end cap 1302 to form the internal environment of the battery cell 1310, wherein the formed internal environment can accommodate the electrode assembly 1320, electrolyte, and other components. The housing 1301 and the end cap 1302 can be independent components. An opening can be provided on the housing 1301, and the end cap 1302 closes the opening to form the internal environment of the battery cell 1310. Alternatively, the end cap 1302 and the housing 1301 can be integrated. Specifically, the end cap 1302 and the housing 1301 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 1301, the end cap 1302 closes the housing 1301. The housing 1301 can have various shapes and sizes; in this embodiment, the housing 1301 is cylindrical. Specifically, the shape of the housing 1301 can be determined according to the specific shape and size of the electrode assembly 1320. The shell 1301 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0123] Electrode assembly 1320 is the component in the battery cell 1310 where the electrochemical reaction occurs. The housing 1301 may contain one or more electrode assemblies 1320. Electrode assembly 1320 is mainly formed by stacking and winding positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 1320, while the portions of the positive and negative electrode sheets without active material each constitute tabs 1330. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, active ions, such as lithium ions, reversibly insert and extract between the positive and negative electrode sheets to achieve charging and discharging. The tabs 1330 connect to the electrode terminals 1340 to form a current loop.

[0124] Figure 5 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application. Figure 6 This is an exploded view of a battery module provided in an embodiment of this application. Figure 7 This is a cross-sectional view of a heat exchange plate provided in an embodiment of this application, as shown below. Figure 3 , Figure 5 , Figure 6 and Figure 7 As shown, the technical solution adopted in this application is: to provide a battery device 1000, which includes at least one battery module 1200, the battery module 1200 including a battery cell assembly 1300 and a heat exchange plate 1400, wherein the battery cell assembly 1300 includes a plurality of battery cells 1310 arranged along a first direction X, the battery cells 1310 are cylindrical, and the first direction X is the axial direction of the battery cells 1310; the heat exchange plate 1400 is located on one side of the battery cell assembly 1300, and the heat exchange plate 1400 has a first surface 1401, the first surface 1401 is thermally connected to the circumferential surface of at least one battery cell 1310, and the first surface 1401 is an arc shape adapted to the circumferential surface, and the heat exchange plate 1400 is provided with a first flow channel 1410, the first flow channel 1410 is used to contain the heat exchange medium, and the extension direction of the first flow channel 1410 is along the first direction X.

[0125] The battery module 1200 is a component composed of the battery cell assembly 1300 and the heat exchange plate 1400 according to the above structure. A battery device 1000 may include one battery module 1200 or multiple battery modules 1200. When the battery device 1000 includes multiple battery modules 1200, the multiple battery modules 1200 can be assembled together in any way, for example, as... Figure 3 As shown, multiple battery modules 1200 are installed in a housing 1100 to form a battery device 1000. Alternatively, the housing 1100 can be omitted, and the multiple battery modules 1200 can be bundled together to form a battery device 1000. Or, the multiple battery modules 1200 can be directly installed on the chassis of the vehicle 01 to form a battery device 1000.

[0126] The battery cell assembly 1300 includes multiple battery cells 1310. The structure of the battery cell 1310 has been described in detail above and will not be repeated in this embodiment. The battery cell 1310 is cylindrical. After multiple battery cells 1310 are arranged along the first direction X, the battery cell assembly 1300 is also cylindrical as a whole. That is, the battery cell assembly 1300 has one circumferential surface and two end faces. The one circumferential surface of the battery cell assembly 1300 is composed of the circumferential surfaces of multiple battery cells 1310. The two end faces of the battery cell assembly 1300 can be the end faces of the battery cells 1310 located at the two ends along the first direction X, or they can be surfaces on other components that are parallel to the end faces of the battery cells 1310. This embodiment does not limit this.

[0127] The heat exchange plate 1400 is a hollow plate structure, and its internal space can be used to arrange the first flow channel 1410. In a heat exchange plate 1400, the number of first flow channels 1410 can be one or more.

[0128] The heat exchange plate 1400 has a first surface 1401 on the side closest to the battery cell assembly 1300. The first surface 1401 is an arc shape that matches the circumferential surface of the battery cell assembly 1300. The matching means that the surface is also an arc shape and its diameter is approximately the same as the diameter of the circumferential surface of the battery cell assembly 1300.

[0129] In this configuration, the first surface 1401 is thermally connected to the circumferential surface of at least one battery cell 1310, which increases the heat exchange area between the heat exchange plate 1400 and the battery cell assembly 1300, thereby improving heat exchange efficiency. Here, thermal connection refers to a connection method that enables heat transfer between the heat exchange plate 1400 and the battery cell assembly 1300. For example, the heat exchange plate 1400 can be in direct contact with the circumferential surface of the battery cell assembly 1300, or it can be in contact without contact or indirectly. As long as the surfaces of the heat exchange plate 1400 and the battery cell assembly 1300 are sufficiently close, or if other heat-conducting media are provided, heat exchange can be achieved, and any such connection method can be called a thermal connection.

[0130] The heat exchange plate 1400 can cover all or part of the circumferential surface of the battery cell module 1300. Understandably, without interfering with the structure on the battery cell module 1300 and without affecting the normal performance of other structures on the battery cell module 1300, the larger the coverage area of ​​the heat exchange plate 1400 on the circumferential surface of the battery cell module 1300, the better the heat exchange effect. In some cases, the heat exchange plate 1400 can even be bent into a cylindrical shape and fitted onto the circumferential surface of the battery cell module 1300.

[0131] The heat exchange plate 1400 can be made of metal or non-metal. For example, the heat exchange plate 1400 is a steel plate. The steel plate has high strength and can withstand a certain force of expansion of the battery cell 1310. At the same time, the steel plate has good thermal conductivity and can exchange heat with the battery cell assembly 1300 in a better way, thereby improving the heat exchange efficiency between the heat exchange plate 1400 and the battery cell assembly 1300.

[0132] The heat exchange medium can be water, fluorinated liquid, mineral oil, hydrocarbon solution, etc., and this application does not limit it in the embodiments.

[0133] The extension direction of the first flow channel 1410 is along the first direction X. That is to say, when the heat exchange medium flows along the first flow channel 1410, the heat exchange medium can pass through one side of multiple battery cells 1310 in sequence along the first direction X, thereby carrying away the heat of multiple battery cells 1310.

[0134] In the above scheme, since the first flow channel 1410 is a straight line along the first direction X, when the heat exchange medium passes through the first flow channel 1410, the flow direction of the heat exchange medium is along a straight line, the flow resistance is small, and the flow velocity is fast. This makes the heat exchange medium maintain a large temperature difference with the battery cell 1310 throughout the entire flow process, which increases the convective heat transfer coefficient, thereby better and more efficiently exchanging heat with the battery cell assembly 1300 and improving the heat exchange efficiency.

[0135] Furthermore, in the above scheme, the battery cells 1310 are arranged along the axial direction. Compared with the arrangement of multiple battery cells 1310 along a direction perpendicular to the axis in related technologies, the heat exchange plate 1400 in this embodiment does not need to be made into an S-shape to accommodate multiple battery cells 1310. Instead, it can be made into a cylindrical or arc-shaped plate, thereby increasing the area of ​​the side of the heat exchange plate 1400 that is close to the battery cells 1310, increasing the heat exchange area, and further improving the heat exchange efficiency.

[0136] In some embodiments, in the same battery module 1200, the heat exchange plate 1400 is thermally connected to each battery cell 1310.

[0137] The heat exchange plate 1400 can be thermally connected to a portion of the circumference of any single battery cell 1310, or it can be thermally connected to the entire circumference of any single battery cell 1310.

[0138] By adopting the above scheme, the heat exchange plate 1400 is thermally connected to each battery cell 1310. Therefore, when the heat exchange medium flows through the first flow channel 1410, it can exchange heat with each battery cell 1310 at close range, thereby improving the heat exchange efficiency between the heat exchange plate 1400 and the battery cell assembly 1300.

[0139] In some embodiments, in the first direction X, the size of the heat exchange plate 1400 is larger than the size of the battery cell assembly 1300.

[0140] For example, in the first direction X, the heat exchange plate 1400 has a size of 100 mm, and the battery cell assembly 1300 has a size of 85 mm.

[0141] The size of the heat exchange plate 1400 is larger than that of the battery cell assembly 1300. This allows the heat exchange plate 1400 to have corresponding parts at various positions in the first direction X for the battery cells 1310 at both ends of the battery cell assembly 1300, thereby achieving close-range heat exchange and improving the heat exchange efficiency between the heat exchange plate 1400 and each battery cell 1310 in the battery cell assembly 1300.

[0142] Figure 8 This is a side view of a battery module along a first direction, provided as an embodiment of this application. Figure 9 This is a schematic diagram of the structure of two heat exchange plates provided in an embodiment of this application. Please refer to... Figure 6 and Figure 8 In some embodiments, within a battery module 1200, multiple heat exchange plates 1400 are provided along the circumferential direction of the battery cell assembly 1300.

[0143] For example, along the circumferential direction of the battery cell assembly 1300, the heat exchange plate 1400 is provided with 2, 3, 4 or more.

[0144] The multiple heat exchange plates 1400 may have the same shape, structure and size or different. Correspondingly, the coverage area of ​​each heat exchange plate 1400 on the circumferential surface of the battery cell assembly 1300 may be the same or different.

[0145] In some embodiments, some heat exchange plates 1400 may be provided with clearance grooves to avoid other structures of the battery cell assembly 1300, wherein other structures refer to structures other than the heat exchange plates 1400, such as explosion-proof structures, sampling structures, etc.

[0146] By setting multiple heat exchange plates 1400, each heat exchange plate 1400 can be independently assembled to the corresponding position in the circumferential direction of the battery cell assembly 1300. When a problem occurs with a certain heat exchange plate 1400, only that heat exchange plate 1400 can be replaced or repaired, without having to remove or replace all the heat exchange plates 1400 as a whole, thus reducing maintenance costs.

[0147] Please continue to refer to Figure 6 and Figure 8 In some embodiments, the coverage area of ​​each heat exchange plate 1400 in the circumferential direction of the battery cell assembly 1300 does not exceed 1 / 2 of the circumferential surface of the battery cell assembly 1300.

[0148] In other words, the heat exchange plate 1400 can be a semi-circular arc plate at most. For example, the heat exchange plate 1400 can be set as a 1 / 2 arc plate, a 1 / 3 arc plate, a 1 / 4 arc plate, etc. Here, the arc ratio refers to the proportion of the arc angle of the heat exchange plate 1400 to the angle of the whole circle.

[0149] Understandably, when the area covered by the heat exchange plate 1400 in the circumferential direction of the battery cell assembly 1300 exceeds 1 / 2 of the circumferential surface of the battery cell assembly 1300, the battery cell assembly 1300 can only be assembled with the heat exchange plate 1400 by inserting it into one end of the heat exchange plate 1400 along the first direction X. However, when the area covered by each heat exchange plate 1400 in the circumferential direction of the battery cell assembly 1300 does not exceed 1 / 2 of the circumferential surface of the battery cell assembly 1300, the heat exchange plate 1400 can be assembled with the battery cell assembly 1300 by directly fastening it to the battery cell assembly 1300 in the radial direction, thus reducing the assembly difficulty of the heat exchange plate 1400 and the battery cell assembly 1300.

[0150] In this case, the arrangement of multiple heat exchange plates 1400 can make up for the problem of the small heat exchange area of ​​a single heat exchange plate 1400. This allows multiple heat exchange plates 1400 to be easily assembled with the battery cell module 1300, while also covering a large total area on the circumferential surface of the battery cell module 1300. The heat exchange plates 1400 and the battery cell module 1300 can still have high heat exchange efficiency.

[0151] Please continue to refer to Figure 6 , Figure 8 and Figure 9 In some embodiments, the number of heat exchange plates 1400 is 2, and the coverage area of ​​each heat exchange plate 1400 in the circumferential direction of the battery cell assembly 1300 is not less than 1 / 3 of the circumferential surface of the battery cell assembly 1300.

[0152] For example, the coverage area of ​​each heat exchange plate 1400 in the circumferential direction of the battery cell module 1300 can occupy 2 / 5, 3 / 7, etc. of the circumferential surface of the battery cell module 1300.

[0153] The above solution controls the coverage area of ​​each heat exchange plate 1400 in the circumferential direction of the battery cell assembly 1300 to be no less than 1 / 3 of the circumferential surface of the battery cell assembly 1300. This results in a large coverage area of ​​a single heat exchange plate 1400 over the battery cell assembly 1300. In this case, even if only two heat exchange plates 1400 are provided, the total coverage area of ​​the heat exchange plates 1400 over the battery cell assembly 1300 can still be large. This reduces the number of heat exchange plates 1400 while ensuring the total coverage area of ​​the heat exchange plates 1400 over the battery cell assembly 1300, thereby improving the heat exchange efficiency between the heat exchange plates 1400 and the battery cell assembly 1300.

[0154] Within a heat exchange plate 1400, the number of first flow channels 1410 can be one or more.

[0155] like Figure 8 and Figure 9As shown, in some embodiments, a plurality of first ribs 1420 are provided in the heat exchange plate 1400, each first rib 1420 extending along the first direction X, and the plurality of first ribs 1420 are spaced apart along the circumferential direction of the battery cell assembly 1300, so as to divide the space in the heat exchange plate 1400 into a plurality of first flow channels 1410 extending along the first direction X.

[0156] In the above structure, the extension direction of the first rib 1420 is along the first direction X, and the cross-sectional shape of the first rib 1420 perpendicular to the first direction X can be straight or curved. This application embodiment does not limit this.

[0157] The multiple first ribs 1420 can strengthen the structure of the heat exchange plate 1400 and prevent it from being deformed or damaged by the expansion of the battery cell 1310. On the other hand, the multiple first ribs 1420 divide the space inside the heat exchange plate 1400 into multiple first flow channels 1410 arranged along the first direction X. Even if the heat exchange medium is small, after it is distributed to multiple first flow channels 1410, the positions of the battery cell assembly 1300 close to different first flow channels 1410 can exchange heat with the heat exchange medium in the first flow channel 1410 at close range, reduce the local accumulation of heat exchange medium in the heat exchange plate 1400, and improve the temperature uniformity of different parts of the battery cell assembly 1300.

[0158] In the battery device 1000 of the foregoing embodiments, an inlet and an outlet can be directly provided on the heat exchange plate 1400 to introduce and export the heat exchange medium in the first flow channel 1410. Other collector components can also be connected to the heat exchange plate 1400 to integrate or distribute the heat exchange medium in the multiple first flow channels 1410, improve the temperature uniformity of the heat exchange medium in the multiple first flow channels 1410, and thus improve the temperature uniformity of different parts of the battery cell assembly 1300.

[0159] Figure 10 This is a schematic diagram of the structure of a heat exchange plate provided in an embodiment of this application. Figure 11 This is a schematic diagram of the structure of an assembly of a first current collector and a first connector provided in an embodiment of this application. Figure 12 for Figure 11 A schematic diagram of the structure along direction A. (See diagram below.) Figure 10 , Figure 11 and Figure 12 As shown, in some embodiments, the battery module 1200 further includes a first current collector 1500, and the heat exchange plate 1400 is provided with the first current collector 1500 at at least one end along the first direction X; the first current collector 1500 is provided with a first current collection cavity 1510, and the first current collection cavity 1510 is connected to a plurality of first flow channels 1410; the first current collector 1500 is configured to distribute heat exchange medium to the plurality of first flow channels 1410.

[0160] An opening may be provided on the first collector 1500 to communicate with the first collector cavity 1510, which is used for liquid inlet or liquid outlet.

[0161] One or two first manifolds 1500 can be provided. When one first manifold 1500 is provided, it can be located at any end of the heat exchange plate 1400 along the first direction X. The other end of the heat exchange plate 1400 along the first direction X can be provided with other structures that can introduce or export heat exchange medium. When two first manifolds 1500 are provided, the two first manifolds 1500 are located at the two ends of the heat exchange plate 1400 along the first direction X, respectively. One first manifold 1500 is used to distribute the heat exchange medium into multiple first flow channels 1410, and the other first manifold 1500 is used to collect and integrate the heat exchange medium flowing out of multiple first flow channels 1410 and then discharge it.

[0162] Please continue to refer to Figure 10 , Figure 11 and Figure 12 In some embodiments, the battery module 1200 further includes a first connector 1600, which is connected to a first collector cavity 1510 and is configured to connect the first collector cavity 1510 to an external device.

[0163] External devices can be used to contain heat exchange media, such as containment tanks, pipes, and other manifolds.

[0164] The first connector 1600 is configured to connect the first manifold 1510 to an external device; therefore, any form that can achieve this function can be called the first connector 1600. For example, the first connector 1600 can be a pipe connector protruding from the first manifold 1500; the first connector 1600 can also be a connector disposed within a hole structure on the first manifold 1500.

[0165] Optionally, one or more first connectors 1600 may be connected to each first manifold 1500.

[0166] Figure 10 The following is an illustrative example of a heat exchange plate 1400 having a first collector 1500 at each end along the first direction X, and each first collector 1500 having a first connector 1600.

[0167] exist Figure 10 In the structure shown, the heat exchange medium enters the first manifold 1510 after passing through a first connector 1600, and can then be distributed to multiple first flow channels 1410 (see reference). Figure 9Within the heat exchange medium, after the heat exchange medium flows out from multiple first flow channels 1410, it can merge in the first flow collection cavity 1510 of another first flow collector 1500, and finally all flow out from another first connector 1600.

[0168] The above configuration enables the heat exchange medium in the first flow channels 1410 to be integrated when the heat exchange plate 1400 has multiple first flow channels 1410, which facilitates the convergence or divergence of the heat exchange medium in the multiple first flow channels 1410, thereby facilitating the distribution of the heat exchange medium in the multiple first flow channels 1410.

[0169] In addition to cooling the battery cell assembly 1300 by installing a heat exchange plate 1400 on the outside of the battery cell assembly 1300, the battery cell assembly 1300 can also be cooled from the inside. Some possible methods will be explained in detail below.

[0170] Figure 13 This is a schematic diagram of the exploded structure of a second type of battery cell provided in an embodiment of this application. Figure 13 As shown, in some embodiments, the battery cell 1310 includes a housing 1311 and an electrode assembly 1320. The housing 1311 is configured as an annular columnar structure that is closed relative to the external environment. A first hole 1350 is formed in the middle of the annular columnar structure, and the electrode assembly 1320 is disposed around the hole wall of the first hole 1350.

[0171] The wall of the first hole 1350 can be made of the same material as the outer shell 1311. For example, if the wall of the first hole 1350 and the outer shell are both made of aluminum, aluminum has a certain strength and can withstand the expansion force of the battery cell 1310 during use. At the same time, it has good thermal conductivity, which facilitates the heat inside the battery cell 1310 to be conducted out through the wall of the first hole 1350.

[0172] By setting the first hole 1350, the heat inside the battery cell 1310 can be dissipated through the hole wall of the first hole 1350, thereby improving the cooling effect on the battery cell 1310.

[0173] Figure 14 This is an exploded structural diagram of a battery cell assembly provided in an embodiment of this application. The diagram illustrates an example of a battery cell assembly comprising two battery cells. Figure 14 As shown, in some embodiments, the first holes 1350 of a plurality of battery cells 1310 constituting the same battery cell assembly 1300 are coaxially arranged along a first direction X.

[0174] Coaxial setting refers to a coaxiality error within 3 millimeters.

[0175] In the above scheme, the space within the first hole 1350 of multiple battery cells 1310 is connected along the first direction X.

[0176] By adopting the above scheme, the heat from multiple battery cells 1310 that make up the same battery cell assembly 1300 can be dissipated from their respective first holes 1350 and then enter the first holes 1350 of other battery cells 1310. Finally, the heat is dissipated from both ends of the battery cell assembly 1300 along the first direction X, preventing the heat from being directly sprayed onto other battery cells 1310 and causing the local temperature of other battery cells 1310 to rise too quickly, thereby improving the safety of the battery device 1000.

[0177] Figure 15 An exploded view of another battery module provided in an embodiment of this application. (See attached diagram.) Figure 15 As shown, in some embodiments, the battery module 1200 further includes a heat exchange tube 1700, which is disposed in a first hole 1350 of at least one battery cell 1310 and is used to contain a heat exchange medium.

[0178] The heat exchange tube 1700 can also be made of a metal material with good thermal conductivity, such as aluminum. In addition, the outer wall of the heat exchange tube 1700 can be fitted to the wall of the first hole 1350, or there can be a certain gap between them.

[0179] In addition, the heat exchange tube 1700 can be inserted into the first hole 1350 of only one battery cell 1310, or it can be inserted into the first hole 1350 of multiple battery cells 1310.

[0180] In some embodiments, the heat exchange tube 1700 passes through the first hole 1350 of a plurality of battery cells 1310 within a battery cell assembly 1300 along a first direction.

[0181] In some embodiments, the heat exchange tube 1700 is bent and passes through the first hole 1350 of a plurality of battery cells 1310 in a plurality of battery cell assemblies 1300.

[0182] As the heat exchange medium flows along the heat exchange tube 1700, it can remove heat from multiple battery cells 1310 from the middle of the battery cell 1310, further improving the cooling effect on the battery cell assembly 1300.

[0183] Figure 16 This is a schematic diagram of the internal structure of a heat exchange tube provided in an embodiment of this application. It is similar in structure to the heat exchange plate 1400, as shown below. Figure 16 As shown, one or more second flow channels 1720 can also be provided inside the heat exchange tube 1700.

[0184] Please continue to refer to Figure 16In some embodiments, a plurality of second ribs 1710 are provided inside the heat exchange tube 1700, and each second rib 1710 extends along the first direction X to divide the space inside the heat exchange tube 1700 into a plurality of second flow channels 1720 extending along the first direction X.

[0185] The structure of the second rib 1710 here is similar to that of the first rib 1420, and will not be described further in this embodiment of the application.

[0186] By adopting the above scheme, the multiple second ribs 1710 can strengthen the heat exchange tube 1700, preventing it from being deformed or damaged by the expansion of the battery cell 1310. They can also divide the space inside the heat exchange tube 1700 into multiple second flow channels 1720 along the first direction X. Even if the heat exchange medium is small, after it is distributed to multiple second flow channels 1720, the battery cell assembly 1300 can exchange heat with the medium in the second flow channel 1720 at close range at the positions of different second flow channels 1720, reducing the local accumulation of heat exchange medium in the heat exchange tube 1700 and improving the temperature uniformity of different parts of the battery cell assembly 1300.

[0187] In the battery device 1000 of the foregoing embodiments, an inlet and an outlet can be directly provided on the heat exchange tube 1700 to introduce and export the heat exchange medium in the second flow channel 1720. Other collector components can also be connected to the heat exchange tube 1700 to integrate or distribute the heat exchange medium in the multiple second flow channels 1720, improve the temperature uniformity of the heat exchange medium in the multiple second flow channels 1720, and thus improve the temperature uniformity of different parts of the battery cell assembly 1300.

[0188] Figure 17 This is a schematic diagram of the assembly of a heat exchange tube, a second manifold, and a second connector, provided in an embodiment of this application. Figure 18 This is a schematic diagram of the structure of a second current collector and a second connector assembly provided in an embodiment of this application. Figure 19 for Figure 18 A schematic diagram of the B-direction structure. For example, as shown... Figure 16 , Figure 17 , Figure 18 and Figure 19 As shown, in some embodiments, the battery module 1200 further includes a second current collector 1800, and the heat exchange tube 1700 is provided with the second current collector 1800 at at least one end along the first direction X; the second current collector 1800 is provided with a second current collector cavity 1810, and the second current collector cavity 1810 is connected to a plurality of second flow channels 1720; the second current collector 1800 is configured to distribute heat exchange medium to the plurality of second flow channels 1720.

[0189] The second manifold 1800 may be provided with an opening that communicates with the second manifold cavity 1810, which is used for liquid inlet or liquid outlet.

[0190] One or two second manifolds 1800 can be provided. When there is one second manifold 1800, it can be located at any end of the heat exchange tube 1700 along the first direction X. The other end of the heat exchange tube 1700 along the first direction X can be provided with other structures that can introduce or export heat exchange medium. When there are two second manifolds 1800, the two second manifolds 1800 are located at both ends of the heat exchange tube 1700 along the first direction X. One second manifold 1800 is used to distribute the heat exchange medium into multiple second channels 1720, and the other second manifold 1800 is used to collect and integrate the heat exchange medium flowing out of multiple second channels 1720 and then discharge it.

[0191] Please continue to refer to Figure 17 , Figure 18 and Figure 19 In some embodiments, the battery module 1200 further includes a second connector 1900, which is connected to the second collector cavity 1810 and is configured to connect the second collector cavity 1810 to an external device.

[0192] External devices can be used to contain heat exchange media, such as containment tanks, pipes, and other manifolds.

[0193] The second connector 1900 is configured to connect the second manifold 1810 to an external device; therefore, any form that can achieve this function can be called the second connector 1900. For example, the second connector 1900 can be a pipe connector protruding from the second manifold 1800; the second connector 1900 can also be a connector disposed within a hole structure on the second manifold 1800.

[0194] Optionally, one or more second connectors 1900 may be connected to each second manifold 1800.

[0195] Figure 17 The following is an illustrative example of a heat exchange tube 1700 having a second manifold 1800 at each end along the first direction X, and each second manifold 1800 having a second connector 1900.

[0196] exist Figure 17 In the structure shown, the heat exchange medium enters the second manifold 1810 after passing through a second connector 1900, and can then be distributed into multiple second channels 1720. When the heat exchange medium flows out from the multiple second channels 1720, it can merge in the second manifold 1810 of another second manifold 1800, and finally all flow out from another second connector 1900.

[0197] The above configuration enables the heat exchange medium in the second flow channels 1720 to be integrated when the heat exchange tube 1700 has multiple second flow channels 1720, which facilitates the convergence or diversion of the heat exchange medium in the heat exchange tube 1700 in multiple second flow channels 1720, thereby facilitating the distribution of the heat exchange medium in multiple second flow channels 1720.

[0198] Figure 20 This is an exploded structural diagram of the second type of battery device provided in the embodiments of this application. Figure 21 This is a schematic diagram of a pipe manifold provided in an embodiment of this application. Figure 22 This is a schematic diagram of the structure of a main pipe and a pipe manifold assembly provided in an embodiment of this application. Figure 23 for Figure 20 The front view of the battery device shown. Figure 20 , Figure 21 and Figure 22 As shown, in some embodiments, the battery device 1000 further includes a main pipe 1210 and a pipe manifold 1220. The main pipe 1210 is disposed on one side of the plurality of battery modules 1200 along the first direction X. The pipe manifold 1220 has a main pipe connector 1221 and a plurality of first branch pipe connectors 1222 connected to it. The main pipe connector 1221 is connected to the main pipe 1210, and the plurality of first branch pipe connectors 1222 are correspondingly connected to a plurality of heat exchange plates 1400. The pipe manifold 1220 is configured to distribute heat exchange medium to different heat exchange plates 1400.

[0199] In some embodiments, a plurality of first branch pipe joints 1222 are connected one-to-one with the first joints 1600 on a plurality of heat exchange plates, so as to communicate one-to-one with the plurality of heat exchange plates 1400.

[0200] The connection between the main pipe connector 1221 and the main pipe 1210 means that the inner hole of the main pipe connector 1221 is connected to the inner cavity of the main pipe 1210. The connection between the first branch pipe connector 1222 and the heat exchange plate 1400 means that the inner hole of the first branch pipe connector 1222 is connected to at least one first flow channel 1410 in the heat exchange plate 1400.

[0201] In some embodiments, the battery device 1000 includes a battery module 1200, a pipe current collector 1220 is provided, and a plurality of first branch pipe joints 1222 are provided on the pipe current collector 1220. The plurality of first branch pipe joints 1222 are connected to a plurality of heat exchange plates 1400 in the battery module 1200 in a one-to-one correspondence.

[0202] In some embodiments, the battery device 1000 includes a plurality of battery modules 1200 and a plurality of pipe current collectors 1220, which are configured in a one-to-one correspondence with the battery modules 1200. In the corresponding pipe current collectors 1220 and battery modules 1200, a plurality of first branch pipe connectors 1222 are provided on the pipe current collectors 1220, and the plurality of first branch pipe connectors 1222 are connected in a one-to-one correspondence with a plurality of heat exchange plates 1400 in the battery modules 1200.

[0203] In the case where the battery device 1000 includes multiple battery modules 1200, the ends of the multiple battery modules 1200 face the same direction, and the multiple battery modules 1200 are arranged in a row, for example, as... Figure 20 As shown, multiple battery modules 1200 are arranged in multiple rows along the second direction Y, and adjacent rows of battery modules 1200 are arranged along the third direction Z. The first direction X is perpendicular to the second direction Y and the third direction Z.

[0204] In this embodiment of the application, "mutually perpendicular" means that there is an angle of 90°±20° between the two directions.

[0205] In some embodiments, in order to reduce the installation space occupied by the multiple battery modules 1200 and increase the energy density of the battery device 1000, each battery module 1200 has the same length and its two ends are aligned.

[0206] The main conduit 1210 is used to transport heat exchange medium to or from the multiple battery modules 1200 of the battery device 1000, or to collect and output the heat exchange medium from the multiple battery modules 1200. On the same side of the battery modules 1200 along the first direction X, the main conduit 1210 can be arranged along the arrangement direction of the multiple battery modules 1200, that is, the main conduit 1210 sequentially passes through the corresponding end positions of the multiple battery modules 1200 along its length. For example, Figure 23 for Figure 20 The front view of the battery device shown is as follows: Figure 23 As shown, the battery modules 1200 are arranged in three rows along the second direction Y. The main pipe 1210 passes through the corresponding end positions of multiple battery modules 1200 in the first row along the length direction, then bends to the second row, passes through the corresponding end positions of multiple battery modules 1200 in the second row, and finally bends to the third row, passes through the corresponding end positions of multiple battery modules 1200 in the third row.

[0207] The manifold 1220 connects the main pipe 1210 and the heat exchange plate 1400. Depending on the number of heat exchange plates 1400 and the number of first connectors 1600 on each heat exchange plate 1400, multiple first branch connectors 1222 can be provided to correspond one-to-one with multiple first connectors 1600 on the same side of the battery module 1200. In this case, the manifold 1220 may include a main flow channel connected to the main pipe connector 1221 and multiple branch flow channels respectively connected to the first branch connectors 1222. The main flow channel and the branch flow channels are connected so that the heat exchange medium entering the manifold 1220 from the main pipe connector 1221 can be diverted through the main flow channel and the branch flow channels to the heat exchange plates 1400 corresponding to the multiple first connectors 1600.

[0208] Specifically, the connection between the main pipe connector 1221 and the main pipe 1210, and the connection between the first branch pipe connector 1222 and the first connector 1600, can both be sealed connections, such as by adding a sealing ring.

[0209] By adopting the above scheme, the main pipe 1210 can be used to either distribute or collect heat exchange medium from the heat exchange plates 1400 of multiple battery modules 1200 through the inlet or outlet of the liquid, thereby achieving efficient heat exchange for the multiple battery modules 1200. In this structure, the total inlet and / or outlet of the heat exchange medium of multiple battery modules 1200 is integrated into a single main pipe 1210. After multiple parts are integrally formed, the entire assembly is performed, making the process relatively simple.

[0210] Please continue to refer to Figure 20 , Figure 21 and Figure 22 In some embodiments, the battery device 1000 further includes a main pipe 1210 and a pipe manifold 1220. When the main pipe 1210 is located on one side of the battery module 1200 along the first direction X, the pipe manifold 1220 has a main pipe connector 1221, a first branch pipe connector 1222, and a second branch pipe connector 1223 that are connected to each other. The first branch pipe connector 1222 and the second branch pipe connector 1223 are both connected to the main pipe connector 1221. The main pipe connector 1221 is connected to the main pipe 1210. The first branch pipe connector 1222 is connected to the heat exchange plate 1400, and the second branch pipe connector 1223 is connected to the heat exchange tube 1700.

[0211] In some embodiments, the first branch connector 1222 is connected to the first connector 1600 on the heat exchange plate to communicate with the heat exchange plate 1400; the second branch connector 1223 is connected to the second connector 1900 on the heat exchange tube to communicate with the heat exchange tube 1700.

[0212] The connection between the main pipe connector 1221 and the main pipe 1210 means that the inner hole of the main pipe connector 1221 is connected to the inner cavity of the main pipe 1210. The connection between the first branch pipe connector 1222 and the heat exchange plate 1400 means that the inner hole of the first branch pipe connector 1222 is connected to at least one first flow channel 1410 in the heat exchange plate 1400.

[0213] In this embodiment, the pipe current collector 1220 is used to connect the main pipe 1210 and the heat exchange structure of the battery module 1200, wherein the heat exchange structure of the battery module 1200 refers to the heat exchange tube 1700 and the heat exchange plate 1400. On the same side of the battery module 1200 along the first direction X, the number of pipe current collectors 1220 can be the same as the number of battery modules 1200, and they are connected in a one-to-one correspondence. For example, as shown... Figure 23 As shown, there are 17 battery modules 1200. On the same side of the battery module 1200 along the first direction X, there are also 17 pipe current collectors 1220, and each pipe current collector 1220 is connected to the heat exchange structure of a battery module 1200.

[0214] In a specific example, such as Figure 20 As shown, the battery module 1200 includes two heat exchange plates 1400 and one heat exchange tube 1700. Each heat exchange plate 1400 has a first connector 1600 at both ends, and each heat exchange tube 1700 has a second connector 1900 at both ends. That is, the battery module 1200 has two first connectors 1600 and one second connector 1900 on the same side. A manifold 1220 is provided on both sides of the battery module 1200 along the first direction X. The manifold 1220 is a four-way structure including a main pipe connector 1221, two first branch pipe connectors 1222, and a second branch pipe connector 1223. The main pipe connector 1221 is sealed to the main pipe 1210, the two first branch pipe connectors 1222 are sealed to the two first connectors 1600 respectively, and the second branch pipe connector 1223 is sealed to the second connector 1900.

[0215] A sealed connection can be achieved by clamping a sealing ring at the connection point.

[0216] By adopting the above scheme, the heat exchange plates 1400 and heat exchange tubes 1700 of multiple battery modules 1200 are all connected to the pipe collector 1220 and integrated into the main pipe 1210 through the main pipe connector 1221. Through the liquid inlet or outlet of the main pipe 1210, the heat exchange medium can be distributed to or collected from the multiple battery modules 1200, ultimately achieving efficient heat exchange for the multiple battery modules 1200. In this structure, the total inlet and / or total outlet of the heat exchange medium for the multiple battery modules 1200 is integrated, and the entire assembly is simplified after multiple parts are integrally formed.

[0217] In addition, multiple manifolds 1220 are connected to the main pipe 1210. The manifolds 1220 not only serve as diversion and collection functions, but also act as supports. By fixing the manifolds 1220 to the battery module 1200, the main pipe 1210 and the battery module 1200 can be relatively fixed, thereby fixing the main pipe 1210 and making the overall structure of the battery device 1000 stable and compact.

[0218] like Figure 20 , Figure 22 and Figure 23 As shown, in some embodiments, one end of the main pipe 1210 is provided with a pipe port 1211 and the other end is provided with an exhaust valve 1212. The pipe port 1211 is used to inject or discharge the heat exchange medium, and the exhaust valve 1212 is used to discharge the gas in the main pipe 1210.

[0219] The main pipe opening 1211 can be directly configured as an opening at one end of the main pipe 1210, or it can be a joint structure connected to the pipe.

[0220] By connecting the main pipe port 1211 to the component supplying the heat exchange medium, the heat exchange medium can flow in or out through the main pipe port 1211.

[0221] The exhaust valve 1212 can be an automatic exhaust valve, which automatically opens when the gas pressure in the pipeline reaches a certain threshold to discharge the gas in the main pipeline.

[0222] The exhaust valve 1212 discharges the gas in the main pipe 1210, which can reduce the probability of trapped gas in the main pipe 1210, thereby reducing the problems of abnormal noise and weakened heat exchange performance of the main pipe 1210 caused by trapped gas.

[0223] Figure 24 This is a side view of a battery module provided as a first perspective in an embodiment of this application. Figure 24As shown, in some embodiments, a blast-proof valve 1360 is provided on the battery cell 1310. The blast-proof valve 1360 is configured to be actuated when the pressure inside the battery cell 1310 reaches a first threshold. The exhaust direction P of the blast-proof valve 1360 is along the radial direction of the battery cell 1310. In a battery module 1200, a heat exchange plate 1400 avoids at least a portion of the blast-proof valve 1360.

[0224] The explosion-proof valve 1360 is mounted on the housing 1311 of the battery cell 1310. For example, the explosion-proof valve 1360 can be mounted on the end cap 1302 of the housing 1311. Of course, depending on the structure and requirements of the battery cell 1310, the explosion-proof valve 1360 can also be mounted on the housing.

[0225] When the internal pressure or temperature of the battery cell 1310 reaches a first threshold, the explosion-proof valve 1360 actuates or a weak structure within the explosion-proof valve 1360 is damaged, thereby creating an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 1310.

[0226] The term "actuation" as used in this application refers to the activation or actuation of the explosion-proof valve 1360 to a certain state, thereby releasing the internal pressure and temperature of the battery cell 1310. The action of the explosion-proof valve 1360 may include, but is not limited to: movement of components within the explosion-proof valve 1360 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the explosion-proof valve 1360, etc. When the explosion-proof valve 1360 is actuated, the high-temperature, high-pressure substances inside the battery cell 1310 are discharged as waste from the actuated portion. This method allows for pressure and temperature relief of the battery cell 1310 under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0227] The emissions from the battery cell 1310 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0228] When the explosion-proof valve 1360 is installed on the end cover 1302, the exhaust port of the explosion-proof valve 1360 can be directed towards the radial direction of the battery cell 1310, thereby controlling the exhaust direction of the explosion-proof valve 1360 along the radial direction of the battery cell 1310. In this way, it prevents the explosion-proof valve 1360 from directly spraying gas onto adjacent battery cells 1310 in the same battery module 1200, and reduces the thermal impact on adjacent battery cells 1310.

[0229] The heat exchange plate 1400 may be provided with clearance holes, or when there are multiple heat exchange plates 1400, a gap may be provided between adjacent heat exchange plates 1400, and the exhaust direction of the explosion-proof valve 1360 shall be directed toward the gap between the heat exchange plates 1400, so as to achieve the purpose of the heat exchange plate 1400 avoiding the exhaust direction of the explosion-proof valve 1360.

[0230] The heat exchange plate 1400 avoids the exhaust direction of the explosion-proof valve 1360, so that at least part of the gas discharged by the explosion-proof valve 1360 can be sprayed radially to a position away from itself, instead of trapping the discharged gas between the heat exchange plate 1400 and the battery cell 1310, thereby preventing the thermal runaway of the battery cell 1310 from being aggravated.

[0231] Figure 25 This is a front view of a battery device provided in an embodiment of this application. Figure 25 As shown, in some embodiments, there are multiple battery modules 1200, and at least two adjacent battery modules 1200 exist in the battery device 1000, with the exhaust direction P of the explosion-proof valve 1360 of one battery module 1200 facing the heat exchange plate 1400 of the other battery module 1200.

[0232] It is understandable that when one battery module 1200 is adjacent to multiple battery modules 1200, the explosion-proof valve 1360 can be directed toward the heat exchange plate 1400 of any adjacent battery module 1200.

[0233] When a cell 1310 in one battery module 1200 experiences thermal runaway, the emitted fumes will not directly affect the cell 1310 in another battery module 1200. Furthermore, when the high-temperature fumes are sprayed onto the heat exchange plate 1400, they can quickly exchange heat with the heat exchange plate 1400, reducing the temperature and minimizing the damage, thereby slowing down the spread of thermal runaway.

[0234] Figure 26 This is an exploded schematic diagram of a battery device provided in an embodiment of this application. Figure 27 This is a schematic diagram of a limiting frame provided in an embodiment of this application. Figure 26 and Figure 27 As shown, in some embodiments, the battery device 1000 further includes a housing 1100 and a limiting frame 1230; the battery module 1200 and the limiting frame 1230 are both disposed inside the housing 1100, and the limiting frame 1230 is provided with a limiting hole 1231, and the battery module 1200 passes through the limiting hole 1231 along the first direction X.

[0235] The possible structure of the housing 1100 has been described in detail in the preceding embodiments of this application, and will not be repeated in this embodiment.

[0236] The limiting bracket 1230 can be fixed inside the housing 1100. The limiting bracket 1230 can be plate-shaped, and the limiting hole 1231 is a through hole provided on the plate-shaped structure. The number of limiting brackets 1230 can be one or more. The number of limiting holes 1231 on the limiting bracket 1230 is greater than or equal to the number of battery modules 1200.

[0237] Based on the preceding description, the battery module 1200 is cylindrical. Therefore, the limiting hole 1231 can be a circular hole that matches the circumferential surface of the battery module 1200.

[0238] For example, such as Figure 27 As shown, the limiting frame 1230 can be divided into multiple parts, each part is provided with a portion of the edge of the limiting hole 1231, and the multiple parts of the limiting frame 1230 are spliced ​​together to form a complete structure of the limiting hole 1231.

[0239] Optionally, at least two limit frames 1230 are provided, and the battery module 1200 passes through the limit holes 1231 on the multiple limit frames 1230 along the first direction X, so as to balance the two ends of the battery module 1200.

[0240] By adopting the above scheme, the battery module 1200 passes through the limiting hole 1231 along the first direction X, so that the battery module 1200 can be limited by the limiting frame 1230. As long as the position of the limiting hole 1231 on the limiting frame 1230 is fixed, the position of the battery module 1200 in the housing 1100 is relatively fixed. During the use of the battery device 1000, the probability of the battery module 1200 being displaced is small, which improves the stability of the mechanical structure and the stability of the electrical connection structure of the battery device 1000.

[0241] In some embodiments, an explosion-proof valve 1360 is provided on the battery cell 1310, and the explosion-proof valve 1360 is configured to be actuated when the pressure inside the battery cell 1310 reaches a first threshold; the edge of the limiting bracket 1230 surrounding the first direction X abuts against the inner wall of the housing 1100 to divide the space inside the housing 1100 into a plurality of independent first spaces 1120, and at least one explosion-proof valve 1360 is provided in each first space 1120. Figure 26 (The heat exchange plate 1400 in the middle is not shown).

[0242] In some embodiments, the edge of the limiting frame 1230 surrounding the first direction X can be provided with a sealing layer, such as a rubber layer, with the inner wall of the housing 1100. The sealing layer makes the structure more stable after the limiting frame 1230 abuts against the inner wall of the housing 1100, and can achieve a certain sealing effect.

[0243] In other embodiments, the edge of the limiting frame 1230 surrounding the first direction X can also be welded or bonded to the inner wall of the housing 1100. This method can also improve the reliability and sealing of the connection between the limiting frame 1230 and the inner wall of the housing 1100.

[0244] The number of first spaces 1120 is one more than the number of limiting frames 1230. For example, if there is one limiting frame 1230 in the box, the limiting frame 1230 will divide the space inside the box 1100 into two independent first spaces 1120. If there are three limiting frames 1230 in the box 1100, the limiting frame 1230 will divide the space inside the box 1100 into four independent first spaces 1120.

[0245] The number of explosion-proof valves 1360 in the first space 1120 is equal to or less than the number of explosion-proof valves 1360 in the battery module 1200. That is, each first space 1120 can have one or more explosion-proof valves 1360. For example, if a battery module 1200 has 5 explosion-proof valves 1360, then the number of heat exchange spaces can be 2, 3, 4 or 5.

[0246] When there are multiple battery modules 1200, the explosion-proof valves 1360 of multiple battery modules 1200 can also be located in different first spaces 1120.

[0247] By adopting the above solution, multiple explosion-proof valves 1360 of a battery module 1200 are isolated in different spaces by the limiting frame 1230. When one explosion-proof valve 1360 emits smoke, the area affected by the smoke in the entire housing 1100 is small, thereby slowing down the spread of thermal runaway and improving the safety of the battery device 1000.

[0248] like Figure 26 As shown, in some embodiments, at least one first space 1120 is provided with a pressure relief mechanism 1130 on the side wall of the housing 1100. The pressure relief mechanism 1130 is used to actuate when the pressure in the corresponding first space 1120 reaches a second threshold.

[0249] Alternatively, a pressure relief mechanism 1130 may be provided on the side wall of the enclosure 1100 corresponding to each first space 1120, or the pressure relief mechanism 1130 may be provided only on the side walls of the enclosure 1100 corresponding to some of the first spaces 1120, while the pressure relief mechanism 1130 may not be provided on the side walls of the enclosure 1100 corresponding to other first spaces 1120. Those skilled in the art can make selective configurations according to actual needs.

[0250] As an example, the pressure relief mechanism 1130 can be integrally formed with the side wall of the housing 1100.

[0251] As an example, the pressure relief mechanism 1130 can also be separately installed and connected to the side wall of the housing 1100.

[0252] In this embodiment of the application, "actuation" refers to the pressure relief mechanism 1130 being activated or in a certain state, thereby allowing the internal pressure and temperature of the first space 1120 to be released. In this embodiment of the application, the condition for actuating the pressure relief mechanism 1130 is that the pressure of the first space 1120 reaches a second threshold.

[0253] The actions produced when the pressure relief mechanism 1130 is actuated may include, but are not limited to: the movement of components in the pressure relief mechanism 1130 to form an exhaust passage, at least a part of the pressure relief mechanism 1130 breaking, fracturing, tearing or opening, etc.

[0254] When the explosion-proof valve 1360 in the first space 1120 equipped with the pressure relief mechanism 1130 ejects smoke, and the pressure or temperature in the first space 1120 reaches the second threshold, the pressure relief mechanism 1130 is activated to discharge the smoke in the first space 1120, preventing the air pressure in the first space 1120 from continuing to rise and causing further heat spread, thereby improving the safety of the battery device 1000.

[0255] Figure 28 This is a schematic diagram of another limiting frame provided in an embodiment of this application. Figure 29 This is a schematic diagram illustrating the structure of a limiting bracket and a battery module in cooperation, as provided in an embodiment of this application. Figure 28 and Figure 29 As shown, in some embodiments, at least one limiting bracket 1230 is provided with a limiting claw 1233, which is connected to the edge of the limiting hole 1231 and located on one side of the heat exchange plate 1400 along the first direction X, so as to limit the position of the heat exchange plate 1400.

[0256] Optionally, the limiting frame 1230 of the setting limiting claw 1233 is the limiting frame 1230 closest to the end of the battery module 1200 along the first direction X.

[0257] The limiting claw 1233 is connected to the edge of the limiting hole 1231 and is located on one side of the heat exchange plate 1400 along the first direction X. That is, the limiting claw 1233 needs to extend from the edge of the limiting hole 1231 to one side of the heat exchange plate 1400 along the first direction X. In this case, the limiting claw 1233 can be set into a structure similar to an "L". One end of the "L"-shaped structure is connected to the limiting bracket 1230, and the other end extends to one side of the heat exchange plate 1400 along the first direction X.

[0258] Optionally, one end of the "L"-shaped structure located within the extension area of ​​the limiting hole 1231 can be further provided with more structures that can stably limit the heat exchange plate 1400 and prevent the heat exchange plate 1400 from moving. For example, a forked structure can be provided at the end of the "L"-shaped structure to form multi-point limiting of the heat exchange plate 1400.

[0259] Optionally, each heat exchange plate 1400 has a plurality of limiting claws 1233 on one side along the first direction X, and the plurality of limiting claws 1233 are arranged opposite to the heat exchange plate 1400 from different positions.

[0260] The structures of the multiple limiting claws 1233 can be the same or different. By setting multiple limiting claws 1233, a heat exchange plate 1400 can be limited from multiple different positions by multiple limiting claws 1233, which further improves the positional stability of the heat exchange plate 1400.

[0261] By adopting the above scheme, the limiting claw 1233 can restrict the position of the heat exchange plate 1400 in the first direction X, thereby preventing the heat exchange plate 1400 from shifting along the first direction X, and keeping the heat exchange plate 1400 and the battery cell assembly 1300 relatively fixed in the first direction X. With the relative positions of the heat exchange plate 1400 and the battery cell assembly 1300 already fixed, the limiting claw 1233 can also restrict the position of the battery module 1200 as a whole within the housing 1100 by limiting the position of the heat exchange plate 1400.

[0262] Figure 30 Another view of a battery module along a first direction provided in an embodiment of this application. Figure 31 This is a schematic diagram of a sampling harness provided in an embodiment of this application. Figure 30 and Figure 31 As shown, in some embodiments, a sampling component 1240 is provided on the battery cell 1310, and the heat exchange plate 1400 avoids at least a portion of the sampling component 1240.

[0263] In some embodiments, the sampling component 1240 includes a sampling terminal 1241 and a sampling harness 1242 disposed on the battery cell 1310, and the sampling harness 1242 is inserted into the sampling terminal 1241 to transmit sampling signals.

[0264] The sampling terminal 1241 can be a voltage sampling terminal, a temperature sampling terminal, or a dual voltage and temperature sampling terminal. This embodiment of the application does not limit this.

[0265] In some embodiments, the sampling terminal 1241 is disposed on the end cap 1302 of the battery cell 1310, and the socket of the sampling terminal 1241 is disposed on the side of the sampling terminal 1241 near the circumferential surface of the battery cell 1310.

[0266] The sampling harness 1242 can be any one of flexible flat cable (FFC), flexible printed circuit board (FPC), and flexible die-cut circuit (FDC). A sampling plug can be provided on the sampling harness 1242. During assembly, the sampling plug is inserted into the socket of the sampling terminal 1241 to achieve connection.

[0267] Optionally, the sampling harness 1242 can be arranged along the first direction X, and multiple sampling plugs can be arranged on a sampling harness 1242, each sampling plug being used to be inserted into the socket of a sampling terminal 1241.

[0268] In the above scheme, by setting up the sampling component 1240, one or more performance indicators or environmental characteristics of the battery cell 1310 during operation can be monitored to detect abnormalities in a timely manner and make adjustments to prevent safety accidents from occurring.

[0269] The heat exchange plate 1400 avoids at least a portion of the sampling assembly 1240, so that the sampling assembly 1240 can be smoothly assembled with the battery cell 1310 and prevent the sampling assembly 1240 from affecting the heat exchange efficiency of the heat exchange plate 1400.

[0270] Figure 32 for Figure 30 An enlarged view of point C in the middle. (See diagram below.) Figure 32 As shown, in some embodiments, the battery cell assembly 1300 further includes a first insulating member 1380, which covers the circumferential surface of the battery cell 1310, and at least a portion of the first insulating member 1380 is located between the heat exchange plate 1400 and the battery cell 1310.

[0271] The first insulating element 1380 can be a thin film made of polymer materials, such as polycarbonate, polyimide, polytetrafluoroethylene, polyethylene, etc.

[0272] The first insulating component 1380 can be wrapped on the circumferential surface of the battery cell 1310 by electrostatic adsorption, adhesive, or other methods.

[0273] The first insulating element 1380 can also be an insulating coating disposed on the circumferential surface of the battery cell 1310.

[0274] The casing 1311 of the battery cell 1310 is typically made of metal. If the heat exchange plate 1400 is also made of metal, the heat exchange plate 1400 and the casing 1311 of the battery cell 1310 may experience mutual wear, and the heat exchange plate 1400 may even affect the circuit structure of the battery cell 1310. In this situation, by providing the first insulating element 1380, not only can the probability of mutual wear between the heat exchange plate 1400 and the casing 1311 of the battery cell 1310 be reduced, but the battery cell 1310 can also be insulated and protected, preventing the heat exchange plate 1400 from making contact with the circumferential surface of the battery cell 1310 and thus affecting the circuit structure of the battery module 1200.

[0275] Please continue to refer to Figure 32 In some embodiments, the surface of the first insulating member 1380 facing the heat exchange plate 1400 is provided with a plurality of grooves 1382.

[0276] The groove 1382 can be a regular or irregular textured structure that is recessed inward toward the inside of the battery cell 1310. For example, the groove 1382 can be formed on the first insulating member 1380 by heat shrinking or hot pressing process, or it can be formed on the first insulating member 1380 by etching process.

[0277] When the heat exchange plate 1400 contacts the circumferential surface of the battery cell assembly 1300, it can directly contact the first insulating member 1380 for more efficient heat exchange. The groove 1382 makes the surface of the first insulating member 1380 facing the heat exchange plate 1400 uneven, thus reducing the probability of positional misalignment between the battery cell assembly 1300 and the heat exchange plate 1400. This improves the structural stability of the battery module 1200 and reduces the risk of the heat exchange plate 1400 obstructing the exhaust of the explosion-proof valve 1360 or covering the sampling assembly 1240 due to positional misalignment.

[0278] Since the battery cell 1310 is cylindrical, the battery cell 1310 and the heat exchange plate 1400 often rotate relative to each other in the circumferential direction. This relative rotation causes the coverage area of ​​the heat exchange plate 1400 on the circumferential surface of the battery cell assembly 1300 to change, which may cover important features of the battery cell assembly 1300, such as the explosion-proof valve 1360 and the sampling component 1240.

[0279] To further address the issue of relative rotation between the battery cell 1310 and the heat exchange plate 1400, in some embodiments, please continue to refer to... Figure 32 The grooves 1382 are distributed at intervals along the circumferential direction of the circumferential surface of the battery cell 1310.

[0280] The above configuration enables the first insulating member 1380 to play a better anti-slip role in the circumferential direction of the battery cell 1310, preventing the battery cell assembly 1300 and the heat exchange plate 1400 from rotating relative to each other in the circumferential direction, thereby improving the structural stability of the battery module 1200.

[0281] Figure 33 This is an exploded structural diagram of another battery module provided in an embodiment of this application. Figure 33 As shown, in some embodiments, a first adhesive layer 1381 is provided between the heat exchange plate 1400 and the battery cell assembly 1300, and the heat exchange plate 1400 and the battery cell assembly 1300 are connected through the first adhesive layer 1381.

[0282] The first adhesive layer 1381 is a structure formed by curing an adhesive.

[0283] In some examples, a first adhesive layer 1381 is disposed between the first insulator 1380 and the heat exchange plate 1400.

[0284] When the first insulating member 1380 is provided with an uneven structure, the surface of the first insulating member 1380 is uneven due to the existence of the uneven structure. This uneven structure can be used to accommodate the adhesive, so that the first adhesive layer 1381 is firmly bonded to the first insulating member 1380. The first adhesive layer 1381 is not easy to fall off, and the heat exchange plate 1400 and the battery cell assembly 1300 can maintain a stable connection for a long time under the action of the first adhesive layer 1381.

[0285] As can be seen, the first adhesive layer 1381 connects the battery cell assembly 1300 and the heat exchange plate 1400, further preventing relative displacement between the heat exchange plate 1400 and the battery cell assembly 1300, and improving the structural stability of the battery module 1200.

[0286] In some embodiments, the first adhesive layer 1381 comprises thermally conductive adhesive.

[0287] Thermally conductive adhesives can be thermally conductive silicone sheets, thermally conductive potting compounds, thermally conductive silicone paste, thermally conductive double-sided tape, etc.

[0288] By filling the gap between the battery cell assembly 1300 and the heat exchange plate 1400 with thermally conductive adhesive, the contact thermal resistance between the battery cell assembly 1300 and the heat exchange plate 1400 can be reduced, thereby achieving efficient heat exchange between the battery cell assembly 1300 and the heat exchange plate 1400.

[0289] Please continue to refer to Figure 33 In some embodiments, the battery cell assembly 1300 further includes a second insulating member 1390, which covers the wall of the first hole 1350.

[0290] In some embodiments, the second insulating member 1390 has a concave-convex structure on the side facing away from the hole wall of the first hole 1350, and the concave-convex structure can be deformed under pressure.

[0291] In some embodiments, the second insulating member 1390 includes ribs and valleys, which are alternately arranged along the circumferential direction of the hole wall of the first hole 1350.

[0292] In some embodiments, a second adhesive layer 1391 is provided between the heat exchange tube 1700 and the hole wall of the first hole 1350, and the heat exchange tube 1700 and the hole wall of the first hole 1350 are connected by the second adhesive layer 1391.

[0293] In some embodiments, the second adhesive layer 1391 comprises thermally conductive adhesive.

[0294] In the above embodiments, the second insulating member 1390 is provided to reduce mutual wear between the hole wall of the first hole 1350 and the heat exchange tube 1700, and at the same time, it can also provide insulation and isolation between the hole wall of the first hole 1350 and the heat exchange tube 1700, thereby improving the stability of the circuit structure of the battery cell assembly 1300. The uneven structure on the second insulating member 1390 and the second adhesive layer 1391 are both provided to prevent relative displacement between the second insulating member 1390 and the heat exchange tube 1700. The thermally conductive adhesive is provided to improve the heat transfer efficiency between the heat exchange tube 1700 and the battery cell 1310.

[0295] Specifically, the structure and materials of the second insulating element 1390 can be referenced to the first insulating element 1380, and the structure and materials of the second adhesive layer 1391 can be referenced to the first adhesive layer 1381. The embodiments of this application will not be described in detail here.

[0296] Figure 34 This is a schematic diagram of another battery module provided in an embodiment of this application. Figure 34 As shown, in order to further improve the compactness and structural stability of the battery module 1200 based on the aforementioned structure, in some embodiments, the battery module 1200 further includes a fixing strap 1250, which surrounds the heat exchange plate 1400 and the battery cell assembly 1300 so that the heat exchange plate 1400 and the battery cell assembly 1300 abut against each other.

[0297] In some embodiments, the heat exchange plate 1400 is disposed on one side of the battery cell assembly 1300, and the fixing strap 1250 surrounds the heat exchange plate 1400 and the battery cell assembly 1300, and partially contacts the heat exchange plate and partially contacts the battery cell assembly 1300.

[0298] like Figure 34As shown, in some embodiments, multiple heat exchange plates 1400 are arranged in the circumferential direction of the battery cell assembly 1300 and surround the battery cell assembly 1300. The fixing strap 1250 is wrapped around the outer periphery of the multiple heat exchange plates 1400, so that the multiple heat exchange plates 1400 converge towards the middle and clamp the battery cell assembly 1300 inside, thereby fixing the heat exchange plates 1400 and the battery cell assembly 1300.

[0299] In some embodiments, the fixing strap 1250 may be made of materials such as rubber or nylon.

[0300] In addition, one or more fixing belts 1250 can be provided. When multiple fixing belts 1250 are provided, the multiple fixing belts 1250 are spaced apart along the first direction X to fix the heat exchange plate 1400 and the battery cell assembly 1300 from different positions.

[0301] By adopting the above solution, the fixing belt 1250 can fix the heat exchange plate 1400 and the battery cell assembly 1300 into a whole, reducing the probability of relative displacement between the two, further improving the structural stability of the battery module 1200, and enabling the heat exchange plate 1400 and the battery cell assembly 1300 to maintain good heat exchange efficiency for a long time.

[0302] Secondly, embodiments of this application provide an electrical device, which includes the battery device 1000 in any of the foregoing embodiments.

[0303] The various possible structures of the battery device 1000 have been described in detail in the foregoing embodiments, and will not be repeated in this embodiment of the application.

[0304] By adopting the above scheme, the battery device 1000 of the power device has a high heat exchange efficiency, which enables the electrochemical properties of the battery device 1000 to remain stable and good for a long time, resulting in high safety and a long service life.

[0305] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that: include: At least one battery module, the battery module comprising: A battery cell assembly, comprising a plurality of battery cells arranged along a first direction, wherein the battery cells are cylindrical and the first direction is the axial direction of the battery cells; A heat exchange plate is located on one side of the battery cell assembly. The heat exchange plate has a first surface that is thermally connected to the circumferential surface of at least one battery cell. The first surface is an arc shape that is adapted to the circumferential surface. The heat exchange plate has a first flow channel for containing a heat exchange medium. The extension direction of the first flow channel is along the first direction.

2. The battery device according to claim 1, characterized in that: In the same battery module, the heat exchange plate is thermally connected to each of the battery cells.

3. The battery device according to claim 2, characterized in that: In the first direction, the size of the heat exchange plate is larger than the size of the battery cell assembly.

4. The battery device according to claim 1, characterized in that: Within one of the battery modules, multiple heat exchange plates are provided along the circumferential direction of the battery cell assembly.

5. The battery device according to claim 4, characterized in that: The area covered by each heat exchange plate in the circumferential direction of the battery cell assembly does not exceed 1 / 2 of the circumferential surface of the battery cell assembly.

6. The battery device according to claim 4, characterized in that: The number of heat exchange plates is 2, and the coverage area of ​​each heat exchange plate in the circumferential direction of the battery cell assembly is not less than 1 / 3 of the circumferential surface of the battery cell assembly.

7. The battery device according to claim 4, characterized in that: The battery device further includes a main pipe and a pipe manifold. The main pipe is located on one side of the plurality of battery modules along the first direction. The pipe manifold has a main pipe connector and a plurality of first branch pipe connectors connected to each other. The main pipe connector is connected to the main pipe, and the plurality of first branch pipe connectors are connected to a plurality of heat exchange plates respectively. The pipe manifold is configured to distribute the heat exchange medium to different heat exchange plates.

8. The battery device according to any one of claims 1-7, characterized in that: The heat exchange plate is provided with a plurality of first ribs, each of which extends along the first direction. The plurality of first ribs are spaced apart along the circumferential direction of the battery cell assembly to divide the space within the heat exchange plate into a plurality of first flow channels extending along the first direction.

9. The battery device according to claim 8, characterized in that: The battery module further includes a first current collector, and the heat exchange plate is provided with the first current collector at at least one end along the first direction; The first collector has a first collecting cavity, which is connected to a plurality of first flow channels; the first collector is configured to distribute the heat exchange medium to the plurality of first flow channels.

10. The battery device according to any one of claims 1-7, characterized in that: The battery cell includes a housing and an electrode assembly. The housing is configured as an annular columnar structure that is closed relative to the external environment. A first hole is formed in the middle of the annular columnar structure, and the electrode assembly is disposed around the hole wall of the first hole.

11. The battery device according to claim 10, characterized in that: The battery module further includes a heat exchange tube, which is inserted into the first hole of at least one of the battery cells and is used to contain a heat exchange medium.

12. The battery device according to claim 11, characterized in that: The heat exchange tube is provided with a plurality of second ribs, each of which extends along the first direction to divide the space inside the heat exchange tube into a plurality of second flow channels extending along the first direction.

13. The battery device according to claim 12, characterized in that: The battery module further includes a second current collector, and the heat exchange tube is provided with the second current collector at at least one end along the first direction; The second collector has a second collection cavity, which is connected to a plurality of second flow channels; the second collector is configured to distribute the heat exchange medium to the plurality of second flow channels.

14. The battery device according to claim 11, characterized in that: The battery device further includes a main pipe and a pipe manifold. The main pipe is located on one side of the battery module along the first direction. The pipe manifold has a main pipe connector, a first branch pipe connector, and a second branch pipe connector that are connected to each other. The first branch pipe connector and the second branch pipe connector are both connected to the main pipe connector. The main pipe connector is connected to the main pipe. The first branch pipe connector is connected to the heat exchange plate. The second branch pipe connector is connected to the heat exchange tube.

15. The battery device according to claim 7 or 14, characterized in that: One end of the main pipeline is provided with a main pipe port, and the other end is provided with an exhaust valve. The main pipe port is used to inject or discharge the heat exchange medium, and the exhaust valve is used to discharge the gas in the main pipeline.

16. The battery device according to any one of claims 1-7, characterized in that: The battery cell is equipped with an explosion-proof valve, which is configured to be actuated when the pressure inside the battery cell reaches a first threshold. The exhaust direction of the explosion-proof valve is along the radial direction of the battery cell; within one of the battery modules, the heat exchange plate avoids at least a portion of the explosion-proof valve.

17. The battery device according to claim 16, characterized in that: The number of battery modules is multiple, and there are at least two adjacent battery modules in the battery device, wherein the exhaust direction of the explosion-proof valve of one battery module is towards the heat exchange plate of the other battery module.

18. The battery device according to any one of claims 1-7, characterized in that: The battery device also includes: The battery module is housed within the housing; and A limiting frame is provided inside the housing, and a limiting hole is provided on the limiting frame. The battery module passes through the limiting hole along the first direction.

19. The battery device according to claim 18, characterized in that: The battery cell is equipped with an explosion-proof valve, which is configured to be actuated when the pressure inside the battery cell reaches a first threshold. The edge of the limiting frame surrounding the first direction abuts against the inner wall of the box to divide the space inside the box into multiple independent first spaces, and at least one explosion-proof valve is provided in each first space.

20. The battery device according to claim 19, characterized in that: At least one box sidewall corresponding to the first space is provided with a pressure relief mechanism, which is used to actuate when the pressure in the corresponding first space reaches a second threshold.

21. The battery device according to claim 18, characterized in that: At least one limiting bracket is provided with a limiting claw, which is connected to the edge of the limiting hole and located on one side of the heat exchange plate along the first direction to limit the position of the heat exchange plate.

22. The battery device according to any one of claims 1-7, characterized in that: The battery cell is provided with a sampling component, and the heat exchange plate avoids at least a part of the sampling component.

23. The battery device according to any one of claims 1-7, characterized in that: The battery cell assembly further includes a first insulating member, which covers the circumferential surface of the battery cell, and at least a portion of the first insulating member is located between the heat exchange plate and the battery cell.

24. The battery device according to claim 23, characterized in that: The first insulating element has multiple grooves on the side surface facing the heat exchange plate.

25. The battery device according to claim 24, characterized in that: The grooves are spaced apart along the circumferential direction of the circumferential surface of the battery cell.

26. The battery device according to any one of claims 1-7, characterized in that: A first adhesive layer is provided between the heat exchange plate and the battery cell assembly, and the heat exchange plate and the battery cell assembly are connected through the first adhesive layer.

27. The battery device according to claim 26, characterized in that: The first adhesive layer includes a thermally conductive adhesive.

28. The battery device according to any one of claims 1-7, characterized in that: The battery module also includes a fixing strap that surrounds the heat exchange plate and the battery cell assembly so that the heat exchange plate and the battery cell assembly abut against each other.

29. An electrical device, characterized in that: Includes the battery device according to any one of claims 1-28.

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