Battery device, energy storage device, and power consumption device

Abstract

This application discloses a battery device, an energy storage device, and an electrical device. The battery device includes a battery cell assembly and a thermal management component. The thermal management component includes a body, which includes an inlet, an outlet, and a heat exchange zone overlapping with the battery cell assembly. The inlet and outlet are located on one side of the heat exchange zone along a first direction. The heat exchange zone includes a first heat exchange zone and a second heat exchange zone arranged along a second direction. The body has a first flow channel and a second flow channel. The first flow channel passes through the first heat exchange zone, and the second flow channel passes through the second heat exchange zone. The first and second flow channels are connected in parallel between the inlet and the outlet, and the first and second directions intersect. The first flow channel includes a first main inlet channel and a first main outlet channel. The second flow channel includes a second main inlet channel and a second main outlet channel. Along the second direction, the first main inlet channel and the second main inlet channel are located between the first main outlet channel and the second main outlet channel. The technical solution provided by this application can effectively improve the reliability of the battery device.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a battery device, an energy storage device, and an electrical device. The technical solution provided by this application can effectively improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, some embodiments of this application provide a battery device, which includes a battery cell assembly and a thermal management component. The battery cell assembly includes a plurality of battery cells. The thermal management component includes a body, which includes an inlet, an outlet, and a heat exchange zone for exchanging heat with the battery cell assembly. The inlet and outlet are located on one side of the heat exchange zone along a first direction. The heat exchange zone includes a first heat exchange zone and a second heat exchange zone arranged along a second direction. The body has a first flow channel and a second flow channel. The first flow channel passes through the first heat exchange zone, and the second flow channel passes through the second heat exchange zone. The first and second flow channels are connected in parallel between the inlet and the outlet, and the first and second directions intersect. The first flow channel includes a first main inlet channel and a first main outlet channel; the second flow channel includes a second main inlet channel and a second main outlet channel. Along the second direction, the first main inlet channel and the second main inlet channel are located between the first main outlet channel and the second main outlet channel.

[0007] Some embodiments of this application provide a battery device. On the one hand, by setting two parallel first and second flow channels inside the thermal management component, the heat exchange path can be shortened, the flow resistance reduced, and the heat exchange efficiency of the medium to the battery cells improved. This results in a smaller temperature difference between the battery cells overlapping in the first heat exchange zone and the battery cells overlapping in the second heat exchange zone, which is beneficial to improving the consistency of thermal management. On the other hand, the first and second total inlet flow channels are located between the first and second total outlet flow channels, so that the medium acts on the battery cells in the middle first and then on the battery cells on the outside. This improves the problem of a large temperature difference between the battery cells in the middle and the battery cells on the outside, which is beneficial to improving the consistency of thermal management, reducing the risk of thermal runaway of the battery device, and making the battery device highly reliable.

[0008] According to some embodiments of this application, the thermal management component further includes a flow guide. Along a first direction, the flow guide, the inlet, and the outlet are located on the same side of the heat exchange zone. The first main outlet channel is connected to the second main outlet channel through the flow guide, and the second main outlet channel is connected to the outlet.

[0009] The above solution, by setting a flow guide to connect the first main outlet channel and the second main outlet channel, allows the medium in both the first and second channels to flow out through the outlet. On the one hand, it can simplify the external pipeline and improve the volumetric energy density of the battery device. On the other hand, it can reduce the risk of mutual interference between the internal channels of the thermal management component, reduce the manufacturing difficulty of the thermal management component, and improve the manufacturing efficiency of the battery device.

[0010] According to some embodiments of this application, along a first direction, the water inlet is located on the side of the guide member away from the battery cell assembly.

[0011] The above solution, by placing the water inlet on the outside of the guide member, can reduce the interference between the guide member and the water inlet, facilitate the connection between the water inlet and the external pipeline, and improve the assembly efficiency of the battery device.

[0012] According to some embodiments of this application, the body includes a first plate and a second plate, which are stacked on top of each other, forming a first flow channel and a second flow channel between the first plate and the second plate. A flow guide is located on the side of the second plate opposite to the first plate, and a flow guide channel is formed between the flow guide and the second plate. The first main outlet channel is connected to the second main outlet channel through the flow guide channel.

[0013] In the above scheme, the first plate, the second plate, and the flow guide are stacked on top of each other to form the first flow channel, the second flow channel, and the flow guide channel, which makes the thermal management component simple in structure, easy to manufacture, and conducive to improving the manufacturing efficiency of battery devices.

[0014] According to some embodiments of this application, the second plate has a first through hole and a second through hole, the first through hole connecting the flow guide channel and the first main outlet channel, and the second through hole connecting the flow guide channel and the second main outlet channel.

[0015] The above solution, by setting a first through hole and a second through hole on the second plate, facilitates the connection of the guide component to the first main outlet channel and the second main outlet channel, reduces the difficulty of setting the internal flow channel of the thermal management component, and improves the manufacturing efficiency of the thermal management component.

[0016] According to some embodiments of this application, along the stacking direction of the first plate and the second plate, a groove is formed on the side of the first plate facing the second plate, and the battery cell is located on the side of the second plate away from the first plate. The second plate covers the groove to form a first flow channel and a second flow channel.

[0017] The above solution, by setting a groove on the inner side of the first plate, forms a first flow channel and a second flow channel when the first plate and the second plate are stacked together; by setting the outer side of the second plate as a flat surface, it can effectively support the battery cell assembly, so that the medium acts uniformly on the battery cell, which is conducive to improving the consistency of thermal management of the battery device, and thus conducive to improving the reliability of the battery device.

[0018] According to some embodiments of this application, along a first direction, the inlet is located on one side of the first heat exchange zone, and the outlet is located on one side of the second heat exchange zone.

[0019] The above scheme, by setting the inlet on one side of the first heat exchange zone and the outlet on one side of the second heat exchange zone, makes the inlet and outlet of the medium reasonably distributed. On the one hand, it is conducive to the medium acting evenly on the first and second heat exchange zones, and on the other hand, it reduces the risk of mutual interference between the inlet and outlet.

[0020] According to some embodiments of this application, along the second direction, the first main outlet channel is located on one side of the inlet, and the second main outlet channel and the outlet are both located on the other side of the inlet.

[0021] The above solution, along the second direction, by setting the first main outlet channel and the second main outlet channel on both sides of the water inlet, so that the guide member connects the first main outlet channel and the second main outlet channel, can reduce the risk of mutual interference between the flow channels of the thermal management components.

[0022] According to some embodiments of this application, the cross-sectional area of ​​the first main inlet channel is larger than the cross-sectional area of ​​the second main inlet channel.

[0023] The above solution, by setting the cross-sectional area of ​​the first main inlet channel to be larger than that of the second main inlet channel, can improve the problem that the long heat exchange path of the first channel results in a large flow resistance, which leads to a small medium flow rate in the first channel and affects the heat exchange efficiency. This makes the flow rates of the medium in the first and second channels consistent or nearly consistent, thereby reducing the temperature difference between the battery cells overlapping the first heat exchange zone and the battery cells overlapping the second heat exchange zone. This, in turn, helps to improve the thermal management efficiency of the battery device and the reliability of the battery device.

[0024] According to some embodiments of this application, the battery cell assembly includes a first battery cell assembly and a second battery cell assembly, a first heat exchange zone for heat exchange of the first battery cell assembly, and a second heat exchange zone for heat exchange of the second battery cell assembly.

[0025] The above scheme includes a first battery cell assembly and a second battery cell assembly. The first battery cell assembly overlaps in a first heat exchange zone, and the second battery cell assembly overlaps in a second heat exchange zone. This allows the medium in the first flow channel and the second flow channel to exchange heat with the first battery cell assembly and the second battery cell assembly, respectively, thereby reducing the temperature difference between the first battery cell assembly and the second battery cell assembly. This improves the consistency of thermal management of the battery device and enhances the reliability of the battery device.

[0026] According to some embodiments of this application, the first heat exchange zone includes a first region and a second region arranged along a first direction, with the inlet located on the side of the first region away from the second region. The first flow channel includes multiple branch channels connecting a first main inlet channel and a first main outlet channel. At least one branch channel passes through the first region but not the second region, and at least one branch channel passes through both the first and second regions. The flow rate of the medium in the branch channel passing through the first region but not the second region is less than the flow rate of the medium in the branch channel passing through both the first and second regions.

[0027] The above-described scheme, by setting multiple branch channels to divert the medium, can, on the one hand, reduce flow resistance and shorten the heat exchange path, thereby improving the heat exchange efficiency of the thermal management components for individual battery cells, reducing the risk of thermal runaway, and making the battery device more reliable. On the other hand, by setting multiple branch channels to pass through different regions, the defect of large temperature differences between battery cells caused by uneven heat exchange in a single channel is improved, making the heat exchange between battery cells more uniform and facilitating the improvement of thermal management consistency. Furthermore, by setting the flow rate of the branch channel that passes through the first region but not the second region to be less than the flow rate of the branch channel that passes through both the first and second regions, more medium can act on the battery cells in the second region, reducing the temperature difference between battery cells in different regions, which is conducive to improving the thermal management consistency of the first battery cell group, thereby reducing the risk of thermal runaway of the battery device and improving the reliability of the battery device.

[0028] According to some embodiments of this application, the first battery cell assembly includes N battery cells, the number of battery cells overlapping with the first region is a, a is greater than or equal to 40%N and less than or equal to 60%N; the number of battery cells overlapping with the second region is b, b is greater than or equal to 40%N and less than or equal to 60%N, the sum of a and b is equal to N, and a and b are both integers greater than or equal to 1.

[0029] The above scheme sets the flow rate of the medium passing through the second region to be greater than that passing through the first region alone, so that more medium acts between the last 40% to 60% of the battery cells, reducing the temperature difference between battery cells in each region, thereby improving the consistency of thermal management of the battery device and effectively improving the reliability of the battery device.

[0030] According to some embodiments of this application, the total flow rate of the medium in the first flow channel is Q. The flow rate of the medium in the branch flow channel that passes through the first region but not the second region is q1, where q1 is greater than or equal to 15%Q and less than or equal to 25%Q.

[0031] The above scheme sets the flow rate of the medium in the branch channel that only passes through the first region to 15% to 25% of the total flow rate, which allows more flow to act on the second region. This allows more medium to exchange heat with the battery cells on the side away from the inlet, thereby effectively reducing the temperature difference between the individual battery cells in the battery device, which is conducive to improving the consistency of thermal management of the battery device, and thus effectively improving the reliability of the battery device.

[0032] According to some embodiments of this application, the number of branch channels that pass through the first region but not the second region is less than the number of branch channels that pass through the first region and the second region.

[0033] The above solution, by setting more branch channels through the first and second regions, enables more flow to act on the battery cells in the second region, reduces the temperature difference between the battery cells in the first and second regions, facilitates the improvement of thermal management consistency of the battery device, and thus effectively improves the reliability of the battery device.

[0034] According to some embodiments of this application, the multiple branch channels include a first branch channel and a second branch channel. The first branch channel passes through a first region but does not pass through a second region, while the second branch channel passes through both the first and second regions. The first and second branch channels are arranged in parallel.

[0035] The above scheme, by setting up a first branch flow channel and a second branch flow channel in parallel, can effectively reduce the flow resistance of the medium, so that the medium in the first branch flow channel can effectively exchange heat with the battery cells in the first region, and the medium in the second branch flow channel can effectively exchange heat with the battery cells in the first region and the second region, thereby improving the heat exchange efficiency of the thermal management component and thus improving the reliability of the battery device.

[0036] According to some embodiments of this application, the first flow channel further includes a first main flow channel and a second main flow channel, with one end of the first main flow channel and one end of the second main flow channel both connected to the first main inlet flow channel. The first branch flow channel and the second branch flow channel are branch flow channels of the first main flow channel. The second main flow channel passes through the first region and the second region.

[0037] The above solution, by setting the second flow channel connected in parallel with the first main flow channel to pass through the first and second regions, enables the battery cells located in the second region to exchange heat with more media, thereby effectively reducing the temperature difference between the battery cells in the first and second regions, which is conducive to improving the consistency of thermal management and thus effectively improving the reliability of the battery device.

[0038] According to some embodiments of this application, the second region includes a first sub-region, a second sub-region, and a third sub-region arranged along a first direction. The first sub-region is located on the side of the first region away from the inlet, and the second sub-region is located between the first and third sub-regions. The plurality of branch channels also includes a third branch channel and a fourth branch channel. The second branch channel passes through the first region and the first sub-region but not the second and third sub-regions; the third branch channel passes through the first region, the first sub-region, and the second sub-region but not the third sub-region; and the fourth branch channel passes through the first region, the first sub-region, the second sub-region, and the third sub-region.

[0039] The above scheme includes a first region, a first sub-region, a second sub-region, and a third sub-region arranged along a first direction. By setting a first branch flow channel, a second branch flow channel, a third branch flow channel, and a fourth branch flow channel, and defining the heat exchange path of each branch flow channel, the heat exchange of each region can be effectively balanced, thereby reducing the temperature difference of the battery cells in each region, which is conducive to improving the consistency of thermal management, and thus effectively improving the reliability of the battery device.

[0040] According to some embodiments of this application, the first branch channel, the second branch channel, the third branch channel, and the fourth branch channel are branch channels of the first main channel.

[0041] The above solution, by dividing the first main flow channel into a first branch flow channel, a second branch flow channel, a third branch flow channel and a fourth branch flow channel, enables the medium to effectively act on the battery cells in the first region, the first sub-region, the second sub-region and the third sub-region, effectively improving the heat exchange efficiency of the thermal management components to the battery cells, and thus improving the reliability of the battery device.

[0042] According to some embodiments of this application, the second main flow channel and the fourth branch flow channel converge in the third sub-region.

[0043] The above scheme, on the one hand, by setting the confluence of the second main flow channel and the fourth branch flow channel in the third sub-region, allows more medium to act on the battery cells in the third sub-region, thereby reducing the temperature difference between the battery cells in the third sub-region and the battery cells in other regions, which is conducive to improving the consistency of thermal management and making the battery device more reliable; on the other hand, the cooler medium flows directly to the third sub-region through the second main flow channel, which can improve the heat exchange efficiency of the battery cells in the third sub-region, making the heat exchange between the battery cells uniform and conducive to improving the consistency of thermal management.

[0044] According to some embodiments of this application, the first battery cell group includes N battery cells, and the number of battery cells overlapping with the first sub-region is c, where c is greater than or equal to 20%N and less than or equal to 30%N, and c is an integer greater than or equal to 1.

[0045] The above scheme limits the number of battery cells overlapping with the first sub-region to 20% to 30% of the total number of battery cells, so that the remaining battery cells overlap with the second or third sub-region. This allows the medium to uniformly exchange heat with the battery cells in each region, reducing the temperature difference between battery cells in each region, thereby improving the consistency of thermal management of the battery device and improving the reliability of the battery device.

[0046] According to some embodiments of this application, the total flow rate of the medium in the first flow channel is Q, and the flow rate of the medium in the second branch flow channel is q3, where q3 is greater than or equal to 15%Q and less than or equal to 25%Q.

[0047] The above scheme sets the flow rate of the medium in the second branch channel to 15% to 25% of the total flow rate of the medium in the first channel. This allows more flow rate in the first channel to be allocated to the third and fourth branch channels, which can effectively manage the thermal of the battery cells on the side away from the inlet. This reduces the temperature difference between the battery cells in different areas, thereby improving the consistency of thermal management of the battery device and enhancing the reliability of the battery device.

[0048] According to some embodiments of this application, the flow rate of the medium in the first branch channel is q1, the flow rate of the medium in the second branch channel is q3, the flow rate of the medium in the third branch channel is q4, and the sum of the flow rates of the medium in the fourth branch channel and the second main channel is q5, where q5 is greater than q4, q5 is greater than q3, and q5 is greater than q1.

[0049] The above scheme, by setting the flow rate through the third sub-region to be greater than that through other regions, enables the medium to effectively exchange heat with the battery cells in the third sub-region. This results in a smaller temperature difference between the battery cells in the third sub-region and those in other regions, which in turn improves the consistency of thermal management of the battery device and enhances its reliability.

[0050] According to some embodiments of this application, q5 is greater than or equal to 1.5 times q4 and less than or equal to 2.5 times q4.

[0051] The above scheme limits the sum of the flow rates q5 of the media in the fourth branch channel and the second main channel to be greater than or equal to 1.5 times the flow rate q4 of the media in the third branch channel. This allows more media to act on the battery cells in the third sub-region, ensuring effective heat exchange for the battery cells furthest from the inlet. This results in more uniform battery cell temperatures across all regions, effectively reducing the risk of thermal runaway and improving the reliability of the battery device. Limiting the sum of the flow rates q5 of the media in the fourth branch channel and the second main channel to be less than or equal to 2.5 times the flow rate q4 of the media in the third branch channel reduces the risk of lower flow rates in other channels due to a larger sum in the fourth branch channel and the second main channel, which could affect heat exchange efficiency in other regions. This ensures high consistency in the thermal management components of the battery device and further improves its reliability.

[0052] According to some embodiments of this application, the first battery cell assembly includes a first row of battery cells and a second row of battery cells arranged adjacent to each other along a second direction. Each row of battery cells includes a plurality of battery cells arranged along a first direction. A first heat exchange zone is used to exchange heat between the first row of battery cells and the second row of battery cells.

[0053] In the above scheme, the first battery cell assembly includes multiple rows of battery cells arranged along the second direction, and each row of battery cells includes multiple battery cells arranged along the first direction, so that multiple branch flow channels can effectively exchange heat with each battery cell, making the heat exchange of each battery cell uniform, which is conducive to improving the heat exchange efficiency of the thermal management components and making the battery device have high reliability.

[0054] According to some embodiments of this application, along a second direction, the second row of battery cells is located between the first row of battery cells and the second battery cell assembly.

[0055] According to some embodiments of this application, the first branch flow channel includes a first inlet section, a first intermediate section, and a first outlet section, wherein the first intermediate section connects the first inlet section and the first outlet section. The first inlet section overlaps with multiple battery cells in the first row of battery cells, the first intermediate section overlaps with multiple battery cells in the second row of battery cells, and the first outlet section overlaps with multiple battery cells in the first row of battery cells.

[0056] The above scheme, by setting a first inlet section, a first intermediate section, and a first outlet section, for the first branch flow channel, allows the medium to flow from the first row of battery cells to the second row of battery cells, and then from the second row of battery cells back to the first row of battery cells and out. This enables uniform heat exchange between the first row of battery cells on the outside and the second row of battery cells on the inside, reduces the temperature difference between the first row of battery cells and the second row of battery cells, thereby improving the consistency of thermal management and thus improving the reliability of the battery device.

[0057] According to some embodiments of this application, the second branch flow channel includes a second inlet section, a second intermediate section, and a second outlet section. The second intermediate section connects the second inlet section and the second outlet section. The second inlet section overlaps with multiple battery cells in the first row of battery cells, the second intermediate section overlaps with multiple battery cells in the second row of battery cells, and the second outlet section overlaps with multiple battery cells in the first row of battery cells.

[0058] The above scheme, by setting a second inlet section, a second intermediate section, and a second outlet section, for the second branch flow channel, allows the medium to flow from the first row of battery cells to the second row of battery cells, and then from the second row of battery cells back to the first row of battery cells and out. This enables uniform heat exchange between the first row of battery cells on the outside and the second row of battery cells on the inside, reduces the temperature difference between the first row of battery cells and the second row of battery cells, thereby improving the consistency of thermal management and thus improving the reliability of the battery device.

[0059] According to some embodiments of this application, the second inlet section passes through the first sub-region, and the second intermediate section passes through the first sub-region.

[0060] The above scheme, by setting the second inlet section to pass through the first sub-region and the second intermediate section to pass through the first sub-region, can make the heat exchange between the first row of battery cells and the second row of battery cells in the first sub-region uniform, reduce the temperature difference between the first row of battery cells and the second row of battery cells corresponding to the first sub-region, thereby improving the consistency of thermal management and thus improving the reliability of the battery device.

[0061] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell, the overlapping area of ​​the projection of all battery cells overlapping with the first region and the projection of the first flow channel is smaller than the overlapping area of ​​the projection of all battery cells overlapping with the second region and the projection of the first flow channel.

[0062] The above scheme, by setting the overlap area of ​​the projection of all battery cells overlapping with the second region and the projection of the first flow channel to be greater than the overlap area of ​​the projection of all battery cells overlapping with the first region and the projection of the first flow channel, enables more medium to act on the battery cells in the second region, making the heat exchange of battery cells in each region more uniform, effectively reducing the risk of thermal runaway of battery cells, and thus improving the reliability of the battery device.

[0063] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell, the total area of ​​the projection of all battery cells overlapping with the first region is S1, and the overlapping area of ​​the projection of all battery cells overlapping with the first region and the projection of the first flow channel is M1, where M1 is greater than or equal to 43%S1 and less than or equal to 50%S1.

[0064] The above scheme, by limiting the overlap area M1 of the projections of all battery cells overlapping with the first region and the projection of the first flow channel to no less than 43% of the total area S1 of the projections of all battery cells overlapping with the first region, can ensure the heat exchange efficiency of the medium to the battery cells in the first region to a certain extent and reduce the risk of thermal runaway of the battery cells in the first region. By limiting the overlap area M1 of the projections of all battery cells overlapping with the first region and the projection of the first flow channel to no more than 50% of the total area S1 of the projections of all battery cells overlapping with the first region, the medium in the first flow channel can act more on the battery cells in the second region, making the heat exchange of the battery cells in each region uniform, effectively reducing the risk of thermal runaway of the battery cells, and thus improving the reliability of the battery device.

[0065] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell, the total area of ​​the projections of all battery cells overlapping with the first sub-region is S2, and the overlapping area of ​​the projections of all battery cells overlapping with the first sub-region and the projection of the first flow channel is M2, where M2 is greater than or equal to 48%S2 and less than or equal to 55%S2.

[0066] The above scheme, by limiting the overlap area M2 of the projections of all battery cells overlapping with the first sub-region and the projection of the first flow channel to no less than 48% of the total area S2 of the projections of all battery cells overlapping with the first sub-region, can ensure the heat exchange efficiency of the medium to the battery cells in the first sub-region to a certain extent and reduce the risk of thermal runaway of the battery cells in the first sub-region. By limiting the overlap area M2 of the projections of all battery cells overlapping with the first sub-region and the projection of the first flow channel to no more than 55% of the total area S2 of the projections of all battery cells overlapping with the first sub-region, the medium in the first flow channel can act more on the battery cells in the second and third sub-regions, thereby making the heat exchange of the battery cells in each region uniform, effectively reducing the risk of thermal runaway of the battery cells, and thus improving the reliability of the battery device.

[0067] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell group, the total area of ​​the projection of all battery cells overlapping with the second sub-region is S3, and the overlapping area of ​​the projection of all battery cells overlapping with the second sub-region and the projection of the first flow channel is M3, where M3 is greater than or equal to 53%S3 and less than or equal to 60%S3.

[0068] The above scheme, by limiting the overlap area M3 of the projections of all battery cells overlapping with the second sub-region and the projection of the first flow channel to no less than 53% of the total area S3 of the projections of all battery cells overlapping with the second sub-region, can ensure the heat exchange efficiency of the medium to the battery cells in the second sub-region to a certain extent and reduce the risk of thermal runaway of the battery cells in the second sub-region. By limiting the overlap area M3 of the projections of all battery cells overlapping with the second sub-region and the projection of the first flow channel to no more than 60% of the total area S3 of the projections of all battery cells overlapping with the second sub-region, the medium in the first flow channel can act more on the battery cells in the third sub-region, thereby making the heat exchange of the battery cells in each region uniform, effectively reducing the risk of thermal runaway of the battery cells, and thus improving the reliability of the battery device.

[0069] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell group, the area of ​​the projection of the first battery cell group is S4, and the overlapping area of ​​the projection of the first flow channel and the projection of the first battery cell group is M4, where M4 is greater than or equal to 45%S4 and less than or equal to 70%S4.

[0070] The above solution, by limiting the overlapping area M4 of the projection of the first flow channel and the projection of the first battery cell group to not less than 45% and not more than 70% of the projection area S4 of the first battery cell group, can make the heat exchange of each battery cell in the first battery cell group uniform, effectively reduce the risk of thermal runaway of the battery cells, and thus improve the reliability of the battery device.

[0071] According to some embodiments of this application, the battery device further includes a housing body, a support portion, and a connector. The housing body has an opening, and the thermal management component closes the opening and the thermal management component and the housing body together form a space for accommodating a single battery cell. The support portion is located on the side of the thermal management component away from the housing body and is used to support the thermal management component. The connector connects the thermal management component and the support portion.

[0072] The above solution connects the support part and the thermal management component through a connector, which enables the support part to effectively support the thermal management component, and enables the thermal management component to stably support the battery cells, resulting in high structural stability of the battery device and thus high reliability of the battery device.

[0073] According to some embodiments of this application, the connector is a riveted member, and the first and second flow channels bypass the connector.

[0074] The above solution, on the one hand, uses a connector to rivet the thermal management component and the support, which can effectively improve the connection quality between the thermal management component and the support; on the other hand, since the flow channel bypasses the connector, the flow channel is bent, which can effectively increase the heat exchange area between the flow channel and the battery cell, effectively improve the heat exchange efficiency of the thermal management component, and thus effectively improve the reliability of the battery device.

[0075] According to some embodiments of this application, the capacity of a single battery cell is greater than or equal to 400Ah.

[0076] The above-described scheme, by limiting the capacity of individual battery cells to greater than or equal to 400Ah, enables a large capacity battery device. For battery devices with large energy capacities, by setting multiple branch channels within the thermal management component to divert the medium and limiting the flow rate of different branch channels, the heat exchange efficiency of the thermal management component to the individual battery cells can be effectively improved, the temperature difference between battery cells in different regions can be reduced, and the thermal management consistency of the first battery cell group can be improved, thereby reducing the risk of thermal runaway of the battery device and resulting in high reliability of battery devices with such large-capacity battery cells.

[0077] Secondly, some embodiments of this application provide an energy storage device, which includes the battery device provided in the first aspect.

[0078] Thirdly, some embodiments of this application provide an electrical device, which includes the battery device provided in the first aspect.

[0079] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0080] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0081] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application;

[0082] Figure 2 This is a schematic diagram of an energy storage device in some embodiments of this application;

[0083] Figure 3 This is an exploded perspective view of the battery device in some embodiments of this application;

[0084] Figure 4 This is an exploded perspective view of the thermal management components in some embodiments of this application;

[0085] Figure 5 This is a partial schematic diagram of the thermal management components in some embodiments of this application;

[0086] Figure 6 This is a schematic diagram of the thermal management components and battery cells in some embodiments of this application;

[0087] Figure 7 This is a schematic diagram of the thermal management components in some embodiments of this application;

[0088] Figure 8 This is a schematic diagram of the first heat exchange zone in some embodiments of this application;

[0089] Figure 9 This is a schematic diagram of the first region, first sub-region, second sub-region, and third sub-region in some embodiments of this application;

[0090] Figure 10 This is a schematic diagram of the first flow channel, the first row of battery cells, and the second row of battery cells in some embodiments of this application;

[0091] Figure 11 This is an exploded perspective view of the thermal management component and support portion in some embodiments of this application;

[0092] Figure 12 This is a partial schematic diagram of the internal structure of the thermal management component and the support in some embodiments of this application;

[0093] Figure 13 for Figure 12 Enlarged view of point A in the middle.

[0094] Icons: 1000 - Electrical device; 100 - Battery device; 200 - Controller; 300 - Motor; 2000 - Energy storage device; 2001 - Cabinet; 100a - Battery cell assembly; 10 - Thermal management component; 11 - Body; 12 - Flow guide; 110 - First plate; 1100 - Groove; 111 - Second plate; 1110 - First through hole; 1111 - Second through hole; 112 - Water inlet ; 1120 - Inlet pipe; 1121 - Main inlet section; 113 - Outlet; 1130 - Outlet pipe; 114 - Mounting hole; 20a - First heat exchange zone; 20b - Second heat exchange zone; 21 - First area; 22 - Second area; 23 - First sub-area; 24 - Second sub-area; 25 - Third sub-area; 30 - First flow channel; 31 - First main inlet channel; 32 - First main flow channel; 320 - First branch Flow channels; 3201-First inlet section; 3202-First intermediate section; 3203-First outlet section; 321-Second branch flow channel; 3211-Second inlet section; 3212-Second intermediate section; 3213-Second outlet section; 322-Third branch flow channel; 323-Fourth branch flow channel; 33-Second main flow channel; 34-First main outlet channel; 40-Second flow channel; 41-Second main inlet channel; 42-Second main outlet channel; 50-First battery cell assembly; 51-First row of battery cells; 52-Second row of battery cells; 50a-Battery cell; 60-Second battery cell assembly; 70-Casing; 71-First casing section; 72-Second casing section; 73-Connector; 80-Support section; 81-Frame; 82-Crossbeam; x-First direction; y-Second direction; z-Overlap direction of thermal management components and battery cells. Detailed Implementation

[0095] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0096] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0097] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0098] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0099] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0100] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0101] In this application, "multiple" means two or more (including two).

[0102] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0103] The battery cell 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.

[0104] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0105] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0106] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0107] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0108] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0109] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0110] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0111] As an example, the enclosure may include a first enclosure section and a second enclosure section. The first enclosure section and the second enclosure section are fastened together to form a closed space inside the enclosure for housing the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure section may be a top cover or a bottom plate.

[0112] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0113] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0114] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0115] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, and discharge capacity. Furthermore, the reliability of the battery device must also be taken into account.

[0116] To ensure that the individual cells in the battery device are at a suitable temperature and reduce the risk of thermal runaway, the battery device generally also includes a thermal management component. The individual cells and the thermal management component are arranged overlappingly. The thermal management component has an inlet and an outlet, and its interior has a flow channel connecting the inlet and outlet. The flow channel contains a medium to exchange heat with the individual cells, thereby regulating the temperature of the individual cells.

[0117] For battery packs, the temperature of individual battery cells exceeds the ambient temperature. Therefore, the temperature of battery cells on the outer edges is lower than that of those in the center. However, in related technologies, the internal flow channels of the thermal management components are simple, resulting in long heat exchange paths. The temperature of battery cells further away from the water inlet is less effectively regulated, leading to uneven heat exchange among the battery cells and significant temperature differences between them. This is particularly problematic in battery packs with a large number of cells, where the temperature difference between the central and outer cells is substantial, increasing the risk of thermal runaway and impacting the reliability of the battery pack.

[0118] In view of this, to improve the problem of uneven heat exchange between the battery cells in the middle and those on the outside, resulting in poor thermal management consistency and affecting the reliability of the battery device, some embodiments of this application provide a battery device, which includes a battery cell assembly and a thermal management component. The battery cell assembly includes multiple battery cells. The thermal management component includes a body, which includes an inlet, an outlet, and a heat exchange zone for heat exchange with the battery cell assembly. The inlet and outlet are located on one side of the heat exchange zone along a first direction. The heat exchange zone includes a first heat exchange zone and a second heat exchange zone arranged along a second direction. The body has a first flow channel and a second flow channel. The first flow channel passes through the first heat exchange zone, and the second flow channel passes through the second heat exchange zone. The first and second flow channels are connected in parallel between the inlet and the outlet, and the first and second directions intersect. The first flow channel includes a first main inlet channel and a first main outlet channel; the second flow channel includes a second main inlet channel and a second main outlet channel. Along the second direction, the first main inlet channel and the second main inlet channel are located between the first main outlet channel and the second main outlet channel.

[0119] Some embodiments of this application provide a battery device. On the one hand, by setting two parallel first and second flow channels inside the thermal management component, the heat exchange path can be shortened, the flow resistance reduced, and the heat exchange efficiency of the medium to the battery cells improved. This results in a smaller temperature difference between the battery cells overlapping in the first heat exchange zone and the battery cells overlapping in the second heat exchange zone, which is beneficial to improving the consistency of thermal management. On the other hand, the first and second total inlet flow channels are located between the first and second total outlet flow channels, so that the medium acts on the battery cells in the middle first and then on the battery cells on the outside. This improves the problem of a large temperature difference between the battery cells in the middle and the battery cells on the outside, which is beneficial to improving the consistency of thermal management, reducing the risk of thermal runaway of the battery device, and making the battery device highly reliable.

[0120] The technical solutions described in the embodiments of this application are applicable to battery devices, energy storage devices using battery devices, and electrical devices.

[0121] The battery devices described in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0122] Energy storage devices may include energy storage containers, energy storage cabinets, etc. For example, an energy storage cabinet may include a cabinet and one or more battery cells and / or battery devices mounted on the cabinet.

[0123] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The electrical devices in the embodiments of this application include, but are not limited to, those mentioned above.

[0124] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0125] Figure 1 This is a schematic diagram of a vehicle in some embodiments of this application.

[0126] The electrical device 1000 is a vehicle. The vehicle's interior may include a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source for its electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle.

[0127] Please see Figure 2 , Figure 2 This is a schematic diagram of an energy storage device 2000 in some embodiments of this application.

[0128] The energy storage device 2000 can be an energy storage cabinet, which includes a cabinet body 2001 and multiple battery devices 100. The multiple battery devices 100 can be housed within the cabinet body 2001. The multiple battery devices 100 can be connected in series, in parallel, or in a mixed configuration.

[0129] Some embodiments of this application provide a battery device 100, please refer to... Figures 3-7 , Figure 3 This is an exploded perspective view of the battery device 100 in some embodiments of this application. Figure 4 This is an exploded perspective view of the thermal management component 10 in some embodiments of this application. Figure 5 This is a partial schematic diagram of the thermal management component 10. Figure 6This is a schematic diagram of the thermal management component 10 and the battery cell 50a in some embodiments of this application. Figure 7 This is a schematic diagram of the thermal management component 10 in some embodiments of this application.

[0130] The battery device 100 includes a battery cell assembly 100a and a thermal management component 10. The battery cell assembly 100a includes a plurality of battery cells 50a. The thermal management component 10 includes a body 11, which includes an inlet 112, an outlet 113, and a heat exchange zone for exchanging heat with the battery cell assembly 100a. The inlet 112 and outlet 113 are located on one side of the heat exchange zone along a first direction x. The heat exchange zone includes a first heat exchange zone 20a and a second heat exchange zone 20b arranged along a second direction y. The body 11 has a first flow channel 30 and a second flow channel 40. The first flow channel 30 passes through the first heat exchange zone 20a, and the second flow channel 40 passes through the second heat exchange zone 20b. The first flow channel 30 and the second flow channel 40 are connected in parallel between the inlet 112 and the outlet 113, and the first direction x and the second direction y intersect. The first flow channel 30 includes a first main inlet channel 31 and a first main outlet channel 34. The second flow channel 40 includes a second main inlet channel 41 and a second main outlet channel 42. Along the second direction, the first main inlet channel 31 and the second main inlet channel 41 are located between the first main outlet channel 34 and the second main outlet channel 42.

[0131] Battery cell assembly 100a includes a plurality of battery cells 50a. Exemplarily, battery cell assembly 100a includes a plurality of battery cells 50a arranged along a first direction x. Optionally, battery cell assembly 100a includes multiple rows of battery cells 50a arranged along a second direction y, with each row including a plurality of battery cells 50a arranged along the first direction x. Optionally, battery device 100 includes a plurality of battery cell assemblies 100a, for example, battery device 100 includes a first battery cell assembly 50 and a second battery cell assembly 60, the first battery cell assembly 50 and the second battery cell assembly 60 arranged along the second direction y. Optionally, the first direction x and the second direction y are perpendicular to each other.

[0132] In some embodiments, the battery device 100 includes a housing 70, within which a plurality of battery cells 50a are housed. Optionally, a thermal management component 10 is located within the housing 70. Optionally, the thermal management component 10 may be the bottom wall of the housing 70. In some embodiments, the housing 70 includes a housing portion and the thermal management component 10, the thermal management component 10 closing the opening of the housing portion. The battery device 100 further includes a support portion 80 located on the side of the thermal management component 10 opposite to the housing portion, for supporting the thermal management component 10.

[0133] The housing 70 provides an assembly space for the battery cell 50a, and the housing 70 can adopt various structures. In some embodiments, the housing 70 may include a first housing portion 71 and a second housing portion 72, which overlap each other, and together define an assembly space for accommodating the battery cell 50a. The second housing portion 72 may be a hollow structure open at one end, and the first housing portion 71 may be a plate-like structure, with the first housing portion 71 covering the open side of the second housing portion 72 so that the first housing portion 71 and the second housing portion 72 together define the assembly space; alternatively, the first housing portion 71 and the second housing portion 72 may both be hollow structures open on one side, with the open side of the first housing portion 71 covering the open side of the second housing portion 72. In some embodiments, the thermal management component 10 may be part or all of the second housing portion 72.

[0134] Of course, the box 70 formed by the first box part 71 and the second box part 72 can be of various shapes, such as a cylinder, a cuboid or a cube.

[0135] In the battery device 100, there can be multiple battery cells 50a disposed within the housing 70. When there are multiple battery cells 50a disposed within the housing 70, the multiple battery cells 50a can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 50a are connected in both series and parallel. The multiple battery cells 50a can be directly connected in series, in parallel, or in a mixed manner together, and then the whole assembly of the multiple battery cells 50a is housed within the housing 70. Of course, the battery device 100 can also be in the form of multiple battery cells 50a first connected in series, in parallel, or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed within the housing 70.

[0136] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 50a to achieve electrical connection between the multiple battery cells 50a.

[0137] Each battery cell 50a can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 50a can be in the form of a cuboid, cylinder, prism, or other shapes.

[0138] The body 11 of the thermal management component 10 is the main part of the thermal management component 10 and plays the role of regulating the temperature of the battery cell 50a.

[0139] For example, the body 11 has an inlet 112 and an outlet 113. The interior of the body 11 has a flow channel for containing a medium, which communicates with the inlet 112 and the outlet 113. The medium is circulated by connecting to a medium storage device. For example, the medium can be a gas, such as air or hydrogen, or a liquid, such as water, a brine solution, or liquid nitrogen.

[0140] Optionally, the body 11 includes a first plate 110 and a second plate 111, which are stacked on top of each other to form a flow channel to realize the flow of the medium. For example, a groove 1100 is formed on the side of the first plate 110 facing the second plate 111, and the second part covers the groove 1100 to form a flow channel.

[0141] Optionally, the thermal management component 10 is plate-shaped and supports the battery cell 50a.

[0142] Please see Figures 5-6 The water inlet 112 is a portion for introducing the medium into the interior of the thermal management component 10. Optionally, the water inlet 112 can be a perforated structure or a tubular structure. The water inlet 112 is located on one side of the first battery cell assembly 50 along the first direction x.

[0143] The outlet 113 is a portion for discharging the medium from inside the thermal management component 10 to the outside. Optionally, the inlet 112 can be a perforated structure or a tubular structure. The outlet 113 is disposed on the same side as the inlet 112. For example, the outlet 113 is located on one side of the second battery cell assembly 60 along the first direction x.

[0144] The heat exchange zone is the functional area of ​​the thermal management component 10. For example, a battery cell 50a is disposed in the heat exchange zone, and the flow channels in the body 11 that pass through the heat exchange zone can exchange heat with the battery cell 50a to achieve temperature regulation.

[0145] The heat exchange zone includes a first heat exchange zone 20a and a second heat exchange zone 20b. This can be understood as the body 11 having at least two independent functional regions for heat exchange with the battery cell 50a, respectively. For example, please refer to [link to relevant documentation]. Figure 6 The first heat exchange zone 20a overlaps with the first battery cell assembly 50 and exchanges heat with the battery cell 50a in the first battery cell assembly 50. The second heat exchange zone 20b overlaps with the second battery cell assembly 60 and exchanges heat with the battery cell 50a in the first battery cell assembly 50.

[0146] The first flow channel 30 and the second flow channel 40 are internal flow channels of the main body, used to contain the medium to regulate the temperature of their respective battery cells.

[0147] In some embodiments, the first flow channel 30 passes through the first heat exchange zone 20a to regulate the temperature of the battery cell 50a in the first battery cell assembly 50. The second flow channel 40 passes through the second heat exchange zone 20b to regulate the temperature of the battery cell 50a in the second battery cell assembly 60.

[0148] "The first flow channel 30 includes the first main inlet flow channel 31 and the first main outlet flow channel 34" can be understood as follows: the medium enters the first flow channel 30 through the first main inlet flow channel 31 from the inlet 112, passes through the first heat exchange zone 20a to adjust the temperature of the corresponding battery cell 50a, and finally flows into the outlet 113 through the first main outlet flow channel 34.

[0149] "The second flow channel 40 includes the second main inlet channel 41 and the second main outlet channel 42" can be understood as follows: the medium enters the second flow channel 40 through the second main inlet channel 41 from the inlet 112, passes through the second heat exchange zone 20b to adjust the temperature of the corresponding battery cell 50a, and finally flows into the outlet 113 through the second main outlet channel 42.

[0150] Along the second direction, the heat exchange area is divided into outer-middle-outer sections. "Along the second direction, the first main inlet channel 31 and the second main inlet channel 41 are located between the first main outlet channel 34 and the second main outlet channel 42" can be understood as the medium entering the internal channels of the body from the middle and flowing out from the outside, that is, the medium enters from the middle and is discharged from both sides. For example, regarding cooling, taking the first battery cell assembly 50 and the second battery cell assembly 60 as examples, each comprising two rows of battery cells, the first flow channel 30 acts on the two rows of battery cells in the first battery cell assembly 50. The coolant with a lower temperature flows into the first main inlet flow channel 31 and passes through the first heat exchange zone 20a, which can regulate the temperature of the inner row of battery cells. After exchanging heat with the inner row of battery cells, the coolant then regulates the temperature of the outer row of battery cells, and finally flows into the outlet 113 through the first main outlet flow channel 34. Similarly, the second flow channel 40 acts on the two rows of battery cells in the second battery cell assembly 60. The coolant with a lower temperature flows into the second main inlet flow channel 41 and passes through the second heat exchange zone 20b, which can regulate the temperature of the inner row of battery cells. After exchanging heat with the inner row of battery cells, the coolant then regulates the temperature of the outer row of battery cells, and finally flows into the outlet 113 through the second main outlet flow channel 42.

[0151] The above solution, on the one hand, by setting two parallel first flow channels 30 and second flow channels 40 inside the thermal management component 10, can shorten the heat exchange path, reduce flow resistance, and improve the heat exchange efficiency of the medium to the battery cells, so that the temperature difference between the battery cells overlapping the first heat exchange zone 20a and the battery cells overlapping the second heat exchange zone 20b is smaller, which is conducive to improving the consistency of thermal management. On the other hand, the first total inlet flow channel 31 and the second total inlet flow channel 41 are located between the first total outlet flow channel 34 and the second total outlet flow channel 42, so that the medium acts on the battery cells in the middle first and then on the battery cells on the outside, thereby improving the problem of large temperature difference between the battery cells in the middle and the battery cells on the outside, which is conducive to improving the consistency of thermal management, reducing the risk of thermal runaway of the battery device, and making the battery device highly reliable.

[0152] According to some embodiments of this application, the heat management component further includes a flow guide 12. Along the first direction, the flow guide 12, the inlet 112 and the outlet 113 are located on the same side of the heat exchange zone. The first main outlet channel 34 is connected to the second main outlet channel 42 through the flow guide 12, and the second main outlet channel 42 is connected to the outlet 113.

[0153] The guide member 12 is a component that connects the first main outlet channel 34 and the second main outlet channel 42, so that the medium in the first main outlet channel 34 is discharged into the outlet 113 through the guide member 12 and the second main outlet channel 42.

[0154] For example, the guide member 12 is located outside the body 11, and a flow channel is formed inside the guide member 12. One end of the guide member 12 is connected to the first main outlet channel 34, and the other end is connected to the second main outlet channel 42, so that the medium in the first flow channel 30 flows into the outlet 113 through the first main outlet channel 34 and the guide member 12.

[0155] Optionally, the flow guide 12 has an independent flow channel to connect the first main outlet channel 34 and the second main outlet channel 42, for example, the flow guide 12 is a flow pipe.

[0156] Optionally, the flow guide 12 and the body 11 are stacked together, and the two together form a flow channel connecting the first main flow channel 34 and the second main flow channel 42.

[0157] The above solution, by setting the flow guide 12 to connect the first main outlet channel 34 and the second main outlet channel 42, allows the medium in the first flow channel 30 and the second flow channel 40 to flow out from the outlet 113. On the one hand, it can simplify the external pipeline and improve the volumetric energy density of the battery device 100. On the other hand, it can reduce the risk of mutual interference between the internal flow channels of the thermal management component 10, reduce the manufacturing difficulty of the thermal management component 10, and improve the manufacturing efficiency of the battery device.

[0158] According to some embodiments of this application, please refer to Figure 5Along the first direction x, the water inlet is located on the side of the guide member away from the battery cell assembly.

[0159] In some embodiments, along the first direction x, the inlet 112 is located outside the guide member 12, and the guide member 12 is located between the inlet 112 and the battery cell assembly 100a. Optionally, both the inlet 112 and the outlet 113 are located outside the guide member 12.

[0160] The above solution, by setting the water inlet 112 on the outside of the guide member 12, can reduce the interference between the guide member 12 and the water inlet 112, facilitate the connection of the water inlet 112 with the external pipeline, and improve the assembly efficiency of the battery device 100.

[0161] In some other embodiments, the inlet 112 and the outlet 113 may be located inside the guide member 12 along the first direction x.

[0162] According to some embodiments of this application, the body 11 includes a first plate 110 and a second plate 111, which are stacked on top of each other, forming a first flow channel 30 and a second flow channel 40 between the first plate 110 and the second plate 111. A flow guide 12 is located on the side of the second plate 111 opposite to the first plate 110, forming a flow guide channel between the flow guide 12 and the second plate 111. A first main outlet channel 34 is connected to a second main outlet channel 42 through the flow guide channel.

[0163] Optionally, the body 11 includes a first plate 110 and a second plate 111 stacked on top of each other. A groove 1100 is formed on the surface of the first plate 110 facing the second plate 111, and the second plate 111 covers the groove 1100 to form a first flow channel 30 and a second flow channel 40. Exemplarily, the groove 1100 is formed by a stamping process on the first plate 110, and the battery cell 50a is disposed on the second plate 111.

[0164] Optionally, the surface of the flow guide 12 facing the second plate 111 is formed with a recess, such as a groove, and the flow guide 12 and the second plate 111 are stacked together to form a flow channel.

[0165] Optionally, the second plate 111 has a recess, such as a groove, formed on the surface of the flow guide 12, and the flow guide 12 and the second plate 111 are stacked together to form a flow channel.

[0166] Optionally, the body 11 includes a first plate 110 and a second plate 111 stacked on top of each other. The surface of the first plate 110 facing the second plate 111 has a groove 1100, and the surface of the second plate 111 facing the first plate 110 has a groove 1100. The first plate 110 and the second plate 111 overlap each other, so that their respective grooves 1100 overlap each other to jointly form the first flow channel 30 and the second flow channel 40.

[0167] In some embodiments, the material of the first plate 110 includes, but is not limited to, aluminum, steel, aluminum alloy, copper, and copper alloy. In some embodiments, the material of the second plate 111 includes, but is not limited to, aluminum, steel, aluminum alloy, copper, and copper alloy. The material of the guide member 12 includes, but is not limited to, aluminum, steel, aluminum alloy, copper, and copper alloy.

[0168] Optionally, the first plate 110 and the second plate 111 can be connected in various ways, including but not limited to welding, bonding, hot pressing or cold pressing.

[0169] Optionally, the connection method of the flow guide 12 and the second plate 111 is diverse, including but not limited to welding, bonding, hot pressing or cold pressing.

[0170] In the above scheme, the first plate 110, the second plate 111, and the flow guide 12 are stacked on top of each other to form the first flow channel 30, the second flow channel 40, and the flow guide channel, which makes the thermal management component 10 simple in structure, easy to manufacture, and conducive to improving the manufacturing efficiency of the battery device 100.

[0171] According to some embodiments of this application, please refer to Figure 5 The second plate 111 has a first through hole 1110 and a second through hole 1111. The first through hole 1110 connects the guide channel and the first main outlet channel 34, and the second through hole 1111 connects the guide channel and the second main outlet channel 42.

[0172] The first through hole 1110 is provided corresponding to the first main outlet channel 34, and the second through hole 1111 is provided corresponding to the second main outlet channel 42. The flow guide 12 is stacked on the second plate 111, and the flow guide 12 closes the first through hole 1110 and the second through hole 1111. The flow guide channel formed by the flow guide 12 and the second plate 111 connects the first through hole 1110 and the second through hole 1111.

[0173] The above solution, by providing a first through hole 1110 and a second through hole 1111 on the second plate 111, facilitates the connection of the flow guide 12 to the first main flow channel 34 and the second main flow channel 42, reduces the difficulty of setting the internal flow channel of the thermal management component 10, and improves the manufacturing efficiency of the thermal management component 10.

[0174] According to some embodiments of this application, please refer to Figure 4 Along the stacking direction of the first plate 110 and the second plate 111, a groove 1100 is formed on the side of the first plate 110 facing the second plate 111, and the battery cell 50a is located on the side of the second plate 111 away from the first plate 110. The second plate 111 covers the groove 1100 to form a first flow channel 30 and a second flow channel 40.

[0175] Please see Figure 4 The first plate 110 has a groove formed on its inner side, and the outer surface of the second plate 111 is flat. In some embodiments, the side of the second plate 111 opposite to the first plate 110 is used to support the battery cell assembly 100a, and the bottom wall of the battery cell 50a is in contact with the second plate 111. The medium is located on the inner side of the second plate 111, and heat exchange with the battery cell 50a is achieved through the thermally conductive contact between the second plate 111 and the battery cell 50a.

[0176] The above solution, by providing a groove 1100 on the inner side of the first plate 110, forms a first flow channel 30 and a second flow channel 40 when the first plate 110 and the second plate 111 are stacked together; by setting the outer side of the second plate 111 as a flat surface, it can effectively support the battery cell assembly 100a, so that the medium acts uniformly on the battery cell 50a, which is conducive to improving the consistency of thermal management of the battery device, and thus conducive to improving the reliability of the battery device 100.

[0177] According to some embodiments of this application, please refer to Figure 6 Along the first direction x, the inlet 112 is located on one side of the first heat exchange zone 20a, and the outlet 113 is located on one side of the second heat exchange zone 20b.

[0178] In some embodiments, along the first direction x, the inlet 112 is located on one side of the first heat exchange zone 20a, and the outlet 113 is located on one side of the second heat exchange zone 20b. For example, as... Figure 6 Along the second direction y, the inlet 112 and the outlet 113 are spaced apart, with the inlet 112 located to the left of the first heat exchange zone 20a and the outlet 113 located to the left of the second heat exchange zone 20b.

[0179] Optionally, the inlet 112 is connected to an external pipe, which may be equipped with a valve body. Along the second direction y, the valve body may be located between the inlet 112 and the outlet 113, or it may be located on the side of the inlet 112 away from the outlet 113.

[0180] Optionally, the outlet 113 is connected to an external pipe, which may be equipped with a valve body. Along the second direction y, the valve body may be located between the inlet 112 and the outlet 113, or it may be located on the side of the outlet 113 away from the inlet 112.

[0181] The above scheme, by setting the inlet 112 on one side of the first heat exchange zone 20a and the outlet 113 on one side of the second heat exchange zone 20b, makes the inlet and outlet positions of the medium reasonably distributed. On the one hand, it is conducive to the medium acting evenly on the first heat exchange zone 20a and the second heat exchange zone 20b. On the other hand, it reduces the risk of mutual interference between the inlet and outlet.

[0182] According to some embodiments of this application, along the second direction y, the first main outlet channel 34 is located on one side of the inlet 112, and the second main outlet channel 42 and the outlet 113 are both located on the other side of the inlet 112.

[0183] In some embodiments, along the first direction x, the inlet 112 is located on one side of the first heat exchange zone 20a, the outlet 113 is located on one side of the second heat exchange zone 20b, the first main outlet channel 34 is located on the side of the inlet 112 away from the outlet 113, and the first main outlet channel 34 is connected to the second main outlet channel 42 through the guide member 12.

[0184] According to some embodiments of this application, the cross-sectional area of ​​the first main inlet channel 31 is larger than the cross-sectional area of ​​the second main inlet channel 41.

[0185] In some embodiments, the heat exchange path of the first flow channel 30 is greater than that of the second flow channel 40. For example, along the second direction y, the first main outlet channel 34 is located on one side of the inlet 112, and the second main outlet channel 42 and the outlet 113 are both located on the other side of the inlet 112. The first main outlet channel 34 is connected to the second main outlet channel 42 via a guide member 12. This makes the heat exchange path of the first flow channel 30 greater than that of the second flow channel 40.

[0186] The first main inlet channel 31 is the part of the first channel 30 that is directly connected to the inlet 112, and the second main inlet channel 41 is the part of the second channel 40 that is directly connected to the inlet 112.

[0187] Cross-sectional area can be understood as the geometric area intercepted by a plane perpendicular to the direction of the cut-off flow inside the flow channel.

[0188] The statement "the cross-sectional area of ​​the first main inlet channel 31 is greater than the cross-sectional area of ​​the second main inlet channel 41" can be understood as the minimum cross-sectional area of ​​the first main inlet channel 31 being greater than the maximum cross-sectional area of ​​the second main inlet channel 41, so that the medium can relatively easily enter the first channel 30 after entering through the inlet 112.

[0189] Optionally, the fact that the cross-sectional area of ​​the first main inlet channel 31 is greater than the cross-sectional area of ​​the second main inlet channel 41 can be understood as the width of the first main inlet channel 31 being greater than the width of the second main inlet channel 41.

[0190] The above solution, by setting the cross-sectional area of ​​the first main inlet channel 31 to be larger than that of the second main inlet channel, can improve the problem of uneven distribution of medium flow rate in the first main inlet channel 30 and the second main inlet channel 40 due to the large flow resistance caused by the long heat exchange path of the first main inlet channel 30. This makes the heat exchange between battery cells 50a more uniform, which is conducive to improving the thermal management consistency of the first battery cell group 50, reducing the risk of thermal runaway of the battery device 100, and thus improving the reliability of the battery device 100.

[0191] According to some embodiments of this application, please refer to Figure 6 The battery cell assembly 100a includes a first battery cell assembly 50 and a second battery cell assembly 60. A first heat exchange zone 20a is used to exchange heat for the first battery cell assembly 50, and a second heat exchange zone 20b is used to exchange heat for the second battery cell assembly 60.

[0192] The first battery cell assembly 50 and the second battery cell assembly 60 are arranged along the second direction y and overlap the first heat exchange zone 20a and the second heat exchange zone 20b, respectively.

[0193] Optionally, the first battery cell assembly 50 includes multiple rows of battery cells 50a, arranged along a second direction y. Each row of battery cells 50a includes multiple battery cells 50a arranged along a first direction x. Exemplarily, the first battery cell assembly 50 includes a first row of battery cells 51 and a second row of battery cells 52. Along the second direction y, the first row of battery cells 51 is located outside the second row of battery cells 52, and the second row of battery cells 52 is adjacent to the second battery cell assembly 60.

[0194] In the above scheme, the battery cell assembly 100a includes a first battery cell assembly 50 and a second battery cell assembly 60. The first battery cell assembly 50 overlaps with the first heat exchange zone 20a, and the second battery cell assembly 60 overlaps with the second heat exchange zone 20b. This allows the medium in the first flow channel 30 and the second flow channel 40 to exchange heat with the first battery cell assembly 50 and the second battery cell assembly 60, respectively, thereby reducing the temperature difference between the first battery cell assembly 50 and the second battery cell assembly 60. This improves the consistency of thermal management of the battery device 100 and enhances the reliability of the battery device 100.

[0195] According to some embodiments of this application, please refer to Figure 7 and Figure 8 , Figure 8This is a schematic diagram of the first heat exchange zone 20a in some embodiments of this application. The first heat exchange zone 20a includes a first region 21 and a second region 22 arranged along a first direction x, with the inlet 112 located on the side of the first region 21 away from the second region 22. The first flow channel 30 includes multiple branch flow channels, which connect the first main inlet channel 31 and the first main outlet channel 34. At least one branch flow channel passes through the first region 21 but not the second region 22, and at least one branch flow channel passes through both the first region 21 and the second region 22. The flow rate of the medium in the branch flow channel that passes through the first region 21 but not the second region 22 is less than the flow rate of the medium in the branch flow channel that passes through both the first region 21 and the second region 22.

[0196] The statement "The first heat exchange zone 20a includes a first region 21 and a second region 22 arranged along a first direction x, with the inlet 112 located on the side of the first region 21 away from the second region 22" can be understood as follows: along the first direction x, the first heat exchange zone 20a is divided into at least two regions, including the first region 21 and the second region 22. The first region 21 corresponds to at least one battery cell 50a in the first battery cell group 50 near the inlet 112, for example, the battery cell 50a at the front end of the first battery cell group 50. The second region 22 corresponds to the battery cell 50a at the rear end of the first battery cell group 50, for example, the battery cell 50a at the rear end of the first battery cell group 50. For example, the first region 21 and the second region 22 each occupy half of the first heat exchange zone 20a.

[0197] "The first flow channel 30 includes multiple branch flow channels" can be understood as the first flow channel 30 including multiple branch flow channels branching from one or more main flow channels, and the multiple branch flow channels can be connected in parallel with each other. For example, the first flow channel 30 includes a first main flow channel 32, and the first main flow channel 32 branches out into multiple branch flow channels.

[0198] In some embodiments, each branch channel is directly or indirectly connected to the first main inlet channel 31 and the first main outlet channel 34. That is, the medium in the first main inlet channel 31 enters each branch channel, and the medium in each branch channel exchanges heat with the battery cell 50a and then flows into the first main outlet channel 34 and flows to the outlet 113.

[0199] The phrase "at least one branch channel passes through the first region 21 and does not pass through the second region 22" can be understood as at least one branch channel among multiple branch channels passing only through the first region 21, and after passing through the first region 21, flowing through the first main outlet channel 34 and towards the outlet 113. For example, after the medium enters the first channel 30 through the inlet 112, it acts on the battery cell 50a in the first region 21 through one or more branch channels, and then flows through the first main outlet channel 34 and towards the outlet 113.

[0200] "At least one branch flow channel passes through the first region 21 and the second region 22" can be understood as at least one branch flow channel among the multiple branch flow channels passing through the first region 21 and the second region 22, and then flowing to the outlet 113. For example, after the medium enters the first flow channel 30 through the inlet 112, it acts on the battery cell 50a in the first region 21 and the second region 22 through one or more branch flow channels, and then flows out through the outlet 113.

[0201] The statement "The flow rate of the medium in the branch channel that passes through the first region 21 but not the second region 22 is less than the flow rate of the medium in the branch channel that passes through the first region 21 and the second region 22" can be understood as the flow rate of the medium that only passes through the first region 21 being smaller, and the flow rate of the medium that passes through the first region 21 and the second region 22 being larger.

[0202] For example, the first flow channel 30 includes a first branch flow channel 320, a second branch flow channel 321, a third branch flow channel 322, and a fourth branch flow channel 323. The first branch flow channel 320 passes only through the first region 21, while the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323 pass through both the first region 21 and the second region 22. The flow rate of the medium in the first branch flow channel 320 is less than the sum of the flow rates of the medium in the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323.

[0203] For example, methods for detecting the flow rate of a medium in a flow channel include measuring the flow rate using a closed fluid or ultrasonic flow meter, or using reverse 3D simulation of the product, such as using simulation software like CERO-FLOEFD 2312 version.

[0204] In some embodiments, the specific structure and relative positional relationship of the second flow channel 40 and the second heat exchange zone 20b are similar to the specific structure and relative positional relationship of the first flow channel 30 and the first heat exchange zone 20a.

[0205] In the above scheme, by setting multiple branch channels to divert the medium, on the one hand, the flow resistance can be reduced and the heat exchange path shortened, thereby improving the heat exchange efficiency of the thermal management component 10 to the battery cell 50a, reducing the risk of thermal runaway, and making the battery device 100 more reliable. On the other hand, by setting multiple branch channels to pass through different regions, the defect of large temperature difference between battery cells 50a caused by uneven heat exchange in a single channel can be improved, making the heat exchange between battery cells 50a more uniform and conducive to improving the consistency of thermal management. Furthermore, by setting the flow rate of the branch channel that passes through the first region 21 but not through the second region 22 to be less than the flow rate of the branch channel that passes through the first region 21 and the second region 22, more medium can act on the battery cells 50a in the second region 22, reducing the temperature difference between battery cells 50a in different regions, which is conducive to improving the consistency of thermal management of the first battery cell assembly 50, thereby reducing the risk of thermal runaway of the battery device 100 and improving the reliability of the battery device 100.

[0206] According to some embodiments of this application, the first battery cell assembly 50 includes N battery cells 50a, the number of battery cells 50a overlapping with the first region 21 is a, a is greater than or equal to 40%N and less than or equal to 60%N. The number of battery cells 50a overlapping with the second region 22 is b, b is greater than or equal to 40%N and less than or equal to 60%N, the sum of a and b is equal to N, and both a and b are integers greater than or equal to 1.

[0207] In some embodiments, the first battery cell assembly 50 includes a plurality of battery cells 50a arranged along a first direction x, with the battery cells 50a on the side closer to the water inlet 112 as the front end and the battery cells 50a on the side farther from the water inlet 112 as the tail end. The first region 21 corresponds to the first 40% to 60% of the battery cells 50a, and the second region 22 may correspond to the remaining battery cells 50a.

[0208] The quantity corresponding to the first region 21 can be 40%, 41%, 42%...59%, 60% of the total number N of battery cells 50a in the first battery cell 50a, taking an integer greater than or equal to 1. For example, when N is 26, 40%N can be 10.

[0209] For example, the first battery cell group 50 includes 26 battery cells 50a, and the first region 21 corresponds to 10, 11, 12, 13, 14, 15 or 16 battery cells 50a near the water inlet 112.

[0210] For example, the first battery cell group 50 includes 52 battery cells 50a, and the first region 21 corresponds to 20, 21, 22, 23, 24, 25...32 battery cells 50a near the water inlet 112.

[0211] In the above scheme, the flow rate of the medium passing through the second region 22 is set to be greater than that passing through the first region 21 only, so that more medium acts on the latter 40% to 60% of the number of battery cells 50a, reducing the temperature difference between battery cells 50a in each region, thereby improving the thermal management consistency of the battery device 100 and effectively improving the reliability of the battery device 100.

[0212] According to some embodiments of this application, the total flow rate of the medium in the first flow channel 30 is Q. The flow rate of the medium in the branch flow channel that passes through the first region 21 but not through the second region 22 is q1, where q1 is greater than or equal to 15%Q and less than or equal to 25%Q.

[0213] In some embodiments, the total flow rate of the medium in the first flow channel 30 is Q, and the flow rate of the medium in the branch flow channel of the first flow channel 30 that only passes through the first region 21 is q1. For example, the first flow channel 30 includes a first branch flow channel 320, which passes through the first region 21 but does not pass through the second region 22, and the flow rate of the medium in the first branch flow channel 320 is q1.

[0214] The value of q1 can be greater than or equal to 15%Q and less than or equal to 25%Q. For example, if Q is 5.5 L / min, the value of q1 can be 15%*5.5 L / min, 16%*5.5 L / min, 17%*5.5 L / min, 18%*5.5 L / min, 19%*5.5 L / min, 20%*5.5 L / min, 21%*5.5 L / min, 22%*5.5 L / min, 23%*5.5 L / min, 24%*5.5 L / min, 25%*5.5 L / min, or any value between two adjacent values. For example, the value of q1 can be 0.996 L / min.

[0215] In some embodiments, the flow rate of the medium in the branch channels passing through the first region 21 and the second region 22 can be Q1-q1.

[0216] In some embodiments, the flow rate of the medium passing through the second region 22 can be Q1-q1.

[0217] In the above scheme, setting the flow rate of the medium in the branch channel that only passes through the first region 21 to 15% to 25% of the total flow rate allows more flow to act on the second region 22, thereby allowing more medium to exchange heat with the battery cells 50a on the side away from the inlet 112. This effectively reduces the temperature difference between the individual battery cells 50a in the battery device 100, which is beneficial to improving the thermal management consistency of the battery device 100 and thus effectively improving the reliability of the battery device 100.

[0218] According to some embodiments of this application, the number of branch channels that pass through the first region 21 but not through the second region 22 is less than the number of branch channels that pass through the first region 21 and the second region 22.

[0219] In some embodiments, the number of branch channels that pass only through the first region 21 is less than the number of branch channels that pass through the first region 21 and the second region 22.

[0220] For example, the multiple branch channels include a first branch channel 320, a second branch channel 321, a third branch channel 322, and a fourth branch channel 323. The first branch channel 320, second branch channel 321, third branch channel 322, and fourth branch channel 323 are branch channels branching from the same main channel. For instance, the first channel 30 includes a first main channel 32, and the first branch channel 320, second branch channel 321, third branch channel 322, and fourth branch channel 323 are branch channels of the first main channel 32. The first branch channel 320 passes only through the first region 21, while the second branch channel 321, third branch channel 322, and fourth branch channel 323 pass through both the first region 21 and the second region 22.

[0221] For example, the first flow channel 30 includes a first main flow channel 32 and a second main flow channel 33 branching from the first main flow channel 31. The first main flow channel 32 branches into a first branch flow channel 320, a second branch flow channel 321, a third branch flow channel 322, and a fourth branch flow channel 323. The first branch flow channel 320 passes only through the first region 21, while the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323 pass through both the first region 21 and the second region 22. The second main flow channel 33 passes through both the first region 21 and the second region 22.

[0222] In the above scheme, by setting more branch channels through the first region 21 and the second region 22, more flow can be applied to the battery cell 50a in the second region 22, reducing the temperature difference between the battery cell 50a in the first region 21 and the battery cell 50a in the second region 22, which is conducive to improving the thermal management consistency of the battery device 100, and thus effectively improving the reliability of the battery device 100.

[0223] According to some embodiments of this application, the multiple branch channels include a first branch channel 320 and a second branch channel 321. The first branch channel 320 passes through a first region 21 but does not pass through a second region 22. The second branch channel 321 passes through the first region 21 and the second region 22. The first branch channel 320 and the second branch channel 321 are arranged in parallel.

[0224] In some embodiments, the plurality of branch channels include a first branch channel 320 and a second branch channel 321 arranged in parallel. The medium entering the first channel 30 from the inlet 112 is split once or multiple times and then split again to enter the first branch channel 320 and the second branch channel 321 respectively, so that the medium in the first branch channel 320 exchanges heat with the battery cell 50a overlapping the first region 21, and then is discharged into the outlet 113, so that the medium in the second branch channel 321 exchanges heat with the battery cell 50a overlapping the first region 21 and the second region 22, and then is discharged into the outlet 113.

[0225] In the above scheme, by setting the first branch flow channel 320 and the second branch flow channel 321 in parallel, the flow resistance of the medium can be effectively reduced, so that the medium in the first branch flow channel 320 can effectively exchange heat with the battery cell 50a in the first region 21, and the medium in the second branch flow channel 321 can effectively exchange heat with the battery cell 50a in the first region 21 and the second region 22, thereby improving the heat exchange efficiency of the thermal management component 10 and thus improving the reliability of the battery device 100.

[0226] In some other embodiments, the first branch channel 320 and the second branch channel 321 are not arranged in parallel. For example, the medium enters the first branch channel 320 and the second branch channel 321 after being split into different numbers of times.

[0227] For example, the medium entering the first flow channel 30 through the inlet 112 enters the first branch flow channel 320 after two diversions, and the medium entering the first flow channel 30 through the inlet 112 enters the second branch flow channel 321 after one diversion.

[0228] According to some embodiments of this application, please refer to Figure 8 The first flow channel 30 also includes a first main flow channel 32 and a second main flow channel 33 connected in parallel. The first branch flow channel 320 and the second branch flow channel 321 are branch flow channels of the first main flow channel 32. The second main flow channel 33 passes through the first region 21 and the second region 22.

[0229] In some embodiments, the first flow channel 30 includes a first main flow channel 32 and a second main flow channel 33 connected in parallel. For example, the first flow channel 30 includes a first main flow channel 31, which branches into the first main flow channel 32 and the second main flow channel 33. The medium enters the first flow channel 30 through the inlet 112, passes through the first main flow channel 31, and then flows into the first main flow channel 32 and the second main flow channel 33.

[0230] The first branch channel 320 and the second branch channel 321 are branch channels of the first main channel 32, that is, the first main channel 32 has multiple branches, and the multiple branches include at least the first branch channel 320 and the second branch channel 321.

[0231] The second mainstream channel 33 is connected in parallel with the first mainstream channel 32. After the medium enters the second mainstream channel 33, it can act on the heat exchange of the battery cell 50a overlapping the first region 21 and the second region 22.

[0232] In the above scheme, by setting the second flow channel 40, which is connected in parallel with the first main flow channel 32, to pass through the first region 21 and the second region 22, the battery cell 50a located in the second region 22 can exchange heat with more medium, thereby effectively reducing the temperature difference between the battery cell 50a in the first region 21 and the battery cell 50a in the second region 22, which is conducive to improving the consistency of thermal management and thus effectively improving the reliability of the battery device 100.

[0233] In some embodiments, to allocate the flow of the first main channel 32 and the second main channel 33, the cross-sectional area (e.g., width) and length of the first main channel 32 and the second main channel 33 can be designed. For example, the second main channel 33 serves as a conduit for supplementary flow to primarily exchange heat with the battery cells 50a overlapping the second region 22. If the second main channel 33 requires a larger flow path, its length can be designed to be smaller than the sum of the lengths of the first main channel 32 and its branch channels, and its width can be designed to be larger than the width of the first main channel 32. If it is necessary to balance the flow paths of the second main channel 33 and the first main channel 32, their widths can be designed relatively, for example, the width of the first main channel 32 can be greater than the width of the second main channel 33.

[0234] According to some embodiments of this application, please refer to Figure 9 , Figure 9 This is a schematic diagram of the first region 21, the first sub-region 23, the second sub-region 24, and the third sub-region 25 in some embodiments of this application.

[0235] The second region 22 includes a first sub-region 23, a second sub-region 24 and a third sub-region 25 arranged along the first direction x. The first sub-region 23 is located between the first region 21 and the second sub-region 24, and the second sub-region 24 is located between the first sub-region 23 and the third sub-region 25.

[0236] The multiple branch channels also include a third branch channel 322 and a fourth branch channel 323. The second branch channel 321 passes through the first region 21 and the first sub-region 23 but does not pass through the second sub-region 24 and the third sub-region 25. The third branch channel 322 passes through the first region 21, the first sub-region 23 and the second sub-region 24 but does not pass through the third sub-region 25. The fourth branch channel 323 passes through the first region 21, the first sub-region 23, the second sub-region 24 and the third sub-region 25.

[0237] In some embodiments, the second region 22 includes three sub-regions arranged along a first direction x, namely a first sub-region 23, a second sub-region 24, and a third sub-region 25. In some embodiments, there are no overlapping portions between the first sub-region 23, the second sub-region 24, and the third sub-region 25 along the first direction x. In other embodiments, there are overlapping portions between the first sub-region 23, the second sub-region 24, and the third sub-region 25 along the first direction x.

[0238] Optionally, the second region 22 is divided into three equal parts: a first sub-region 23, a second sub-region 24, and a third sub-region 25. Optionally, the first sub-region 23 occupies half of the second region 22, and the remaining half of the second region 22 is divided by the second sub-region 24.

[0239] In some embodiments, the plurality of branch channels include a third branch channel 322 and a fourth branch channel 323. The medium entering the first channel 30 from the inlet 112 is diverted once or multiple times before entering the third branch channel 322, whereby the medium in the third branch channel 322 exchanges heat with the battery cells 50a overlapping the first region 21, the first sub-region 23, and the second sub-region 24, and then discharges into the outlet 113. The medium entering the first channel 30 from the inlet 112 is diverted once or multiple times before entering the fourth branch channel 323, whereby the medium in the fourth branch channel 323 exchanges heat with the battery cells 50a overlapping the first region 21, the first sub-region 23, the second sub-region 24, and the third sub-region 25, and then discharges into the outlet 113.

[0240] Optionally, the third branch channel 322 and the fourth branch channel 323 are arranged in parallel. For example, the third branch channel 322 and the fourth branch channel 323 are branch channels of the first main channel 32. The medium enters the first channel 30 through the inlet 112, passes through the first main inlet channel 31, and then is diverted to the first main channel 32 and the second main channel 33. The medium in the first main channel 32 is diverted to the first branch channel 320, the second branch channel 321, the third branch channel 322, and the fourth branch channel 323.

[0241] Optionally, the third branch channel 322 and the fourth branch channel 323 are not configured in parallel. For example, the third branch channel 322 can be a branch channel of the first main channel 32, and the fourth branch channel 323 can be a branch channel of the second main channel 33.

[0242] In the above scheme, the first heat exchange zone 20a includes a first region 21, a first sub-region 23, a second sub-region 24, and a third sub-region 25 arranged along the first direction x. By setting a first branch flow channel 320, a second branch flow channel 321, a third branch flow channel 322, and a fourth branch flow channel 323, and defining the heat exchange path of each branch flow channel, the heat exchange of each region can be effectively balanced, thereby reducing the temperature difference of the battery cells 50a in each region, which is conducive to improving the consistency of thermal management, and thus effectively improving the reliability of the battery device 100.

[0243] According to some embodiments of this application, please refer to Figure 9 The first branch channel 320, the second branch channel 321, the third branch channel 322 and the fourth branch channel 323 are branch channels of the first main channel 32.

[0244] In some embodiments, the first branch channel 320, the second branch channel 321, the third branch channel 322, and the fourth branch channel 323 are branch channels of the first main channel 32, and the first branch channel 320, the second branch channel 321, the third branch channel 322, and the fourth branch channel 323 are arranged in parallel with each other.

[0245] Optionally, the medium flow paths in the first branch flow channel 320, the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323 are substantially the same. Optionally, to adjust the flow rate of the medium in the first branch flow channel 320, the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323, the width and / or length of the first branch flow channel 320, the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323 can be adjusted to increase or decrease the flow resistance, thereby reducing or increasing the flow rate.

[0246] In the above scheme, by splitting the first main flow channel 32 into the first branch flow channel 320, the second branch flow channel 321, the third branch flow channel 322 and the fourth branch flow channel 323, the medium can effectively act on the battery cells 50a in the first region 21, the first sub-region 23, the second sub-region 24 and the third sub-region 25, effectively improving the heat exchange efficiency of the thermal management component 10 on the battery cells 50a, which is beneficial to improving the reliability of the battery device 100.

[0247] In some embodiments, the first branch channel 320, the second branch channel 321, the third branch channel 322, or the fourth branch channel 323 can be further branched to improve the heat exchange effect of the main heat exchange area. For example, the main heat exchange area of ​​the first branch channel 320 is the first region 21, and the first branch channel 320 branches out multiple sub-channels at the location corresponding to the first region 21. The main heat exchange area of ​​the second branch channel 321 is the first sub-region 23, and the second branch channel 321 branches out multiple sub-channels at the location corresponding to the first sub-region 23. The main heat exchange area of ​​the third branch channel 322 is the second sub-region 24, and the third branch channel 322 branches out multiple sub-channels at the location corresponding to the second sub-region 24. The main heat exchange area of ​​the fourth branch channel 323 is the third sub-sub-region, and the fourth branch channel 323 branches out multiple sub-channels at the location corresponding to the third sub-region 25. For example, please refer to [link to example]. Figure 9 The third branch channel 322 further branches into two sub-channels, which are connected in parallel and correspond to the second sub-region 24 for heat exchange with the battery cells 50a overlapping the second sub-region 24. In some embodiments, please refer to... Figure 9 The fourth branch channel 323 splits into two sub-channels again. The two parallel sub-channels correspond to the third sub-region 25 to exchange heat with the battery cells 50a that overlap the third sub-region 25.

[0248] According to some embodiments of this application, the second main flow channel 33 and the fourth branch flow channel 323 converge in the third sub-region 25.

[0249] Please see Figure 9 In some embodiments, the inlet 112 is located on the left side of the first heat exchange zone 20a. The first main inlet channel 31 branches into a first main channel 32 and a second main channel 33. The first main channel 32 is above the second main channel 33, and the second main channel 33 is located at the edge of the first heat exchange zone 20a relative to the first main channel 32. The first main channel 32 branches into a first branch channel 320, a second branch channel 321, a third branch channel 322, or a fourth branch channel 323. The second main channel 33 passes through the first region 21, the first sub-region 23, the second sub-region 24, and the third sub-region 25 in a similar straight line. The second main channel 33 merges with the fourth branch channel 323 in the third sub-region 25 to increase the flow rate of the medium acting on the third sub-region 25.

[0250] Optionally, the second main channel 33 branches into two sub-channels in the third sub-region 25. One of the sub-channels merges with the fourth branch channel 323, and the other sub-channel flows into the outlet 113 after passing through the third sub-region 25.

[0251] In the above scheme, on the one hand, by setting the confluence of the second main flow channel 33 and the fourth branch flow channel 323 in the third sub-region 25, more medium can act on the battery cells 50a in the third sub-region 25, thereby reducing the temperature difference between the battery cells 50a in the third sub-region 25 and the battery cells 50a in other regions, which is conducive to improving the consistency of thermal management and making the battery device 100 have higher reliability. On the other hand, the cooler medium flows directly to the third sub-region 25 through the second main flow channel 33, which can improve the heat exchange efficiency of the battery cells 50a in the third sub-region 25, making the heat exchange between the battery cells 50a uniform and conducive to improving the consistency of thermal management.

[0252] According to some embodiments of this application, the first battery cell group 50 includes N battery cells 50a, and the number of battery cells 50a overlapping with the first sub-region 23 is c, where c is greater than or equal to 20%N and less than or equal to 30%N, and c is an integer greater than or equal to 1.

[0253] In some embodiments, the quantity corresponding to the first sub-region 23 can be 20%, 21%, 22%...29%, 30% of the total number N of battery cells 50a in the first battery cell 50a, taking an integer greater than or equal to 1. For example, when N is 26, 20%N can be 5.

[0254] For example, the first battery cell group 50 includes 26 battery cells 50a, and the first region 21 corresponds to 5, 6, 7 or 8 battery cells 50a near the water inlet 112.

[0255] For example, the first battery cell group 50 includes 52 battery cells 50a, and the first region 21 corresponds to 10, 11, 12, 13, 14, 15 and 16 battery cells 50a near the water inlet 112.

[0256] Optionally, please combine Figure 5 and Figure 8 The battery cell 50a overlapping with the first region 21 can be considered as the first 40-60% of the battery cells 50a in the first battery cell group 50, and the battery cell 50a overlapping with the first sub-region 23 can be considered as the subsequent 20-30% of the battery cells 50a in the first battery cell group 50, for example in... Figure 5 In the first battery cell group 50, there are 52 battery cells 50a, 26 battery cells 50a in the first region 21, and 10 battery cells 50a in the first sub-region 23.

[0257] In the above scheme, the number of battery cells 50a overlapping with the first sub-region 23 is limited to 20% to 30% of the total number of battery cells 50a, so that the remaining battery cells 50a overlap with the second sub-region 24 or the third sub-region 25. This allows the medium to uniformly exchange heat with the battery cells 50a in each region, reducing the temperature difference between the battery cells 50a in each region. This, in turn, helps to improve the consistency of thermal management of the battery device 100 and improve the reliability of the battery device 100.

[0258] According to some embodiments of this application, the total flow rate of the medium in the first flow channel 30 is Q, and the flow rate of the medium in the second branch flow channel 321 is q3, where q3 is greater than or equal to 15%Q and less than or equal to 25%Q.

[0259] The total flow rate of the medium in the first flow channel 30 is Q. The flow rate q3 of the medium in the second branch flow channel 321 can be understood as the flow rate q3 of the medium in the branch flow channel of the first flow channel 30 that only passes through the first region 21 and the first sub-region 23.

[0260] The value of q1 can be greater than or equal to 15%Q and less than or equal to 25%Q. For example, if Q is 5.5 L / min, the value of q3 can be 15%*5.5 L / min, 16%*5.5 L / min, 17%*5.5 L / min, 18%*5.5 L / min, 19%*5.5 L / min, 20%*5.5 L / min, 21%*5.5 L / min, 22%*5.5 L / min, 23%*5.5 L / min, 24%*5.5 L / min, 25%*5.5 L / min, or any value between two adjacent values. For example, the value of q1 can be 0.953 L / min.

[0261] In the above scheme, setting the flow rate of the medium in the second branch channel 321 to 15% to 25% of the total flow rate of the medium in the first channel 30 allows a larger amount of flow in the first channel 30 to be allocated to the third branch channel 322 and the fourth branch channel 323, so as to effectively manage the thermal of the battery cell 50a on the side away from the inlet 112, thereby reducing the temperature difference of the battery cell 50a in each region, which in turn helps to improve the consistency of thermal management of the battery device 100 and improve the reliability of the battery device 100.

[0262] According to some embodiments of this application, the flow rate of the medium in the first branch channel 320 is q1, the flow rate of the medium in the second branch channel 321 is q3, the flow rate of the medium in the third branch channel 322 is q4, and the sum of the flow rates of the medium in the fourth branch channel 323 and the second main channel 33 is q5, where q5 is greater than q4, q5 is greater than q3, and q5 is greater than q1.

[0263] In some embodiments, "the flow rate of the medium in the first branch channel 320 is q1, the flow rate of the medium in the second branch channel 321 is q3, the flow rate of the medium in the third branch channel 322 is q4, and the sum of the flow rates of the medium in the fourth branch channel 323 and the second main channel 33 is q5" can be understood as follows: in the first channel 30, the flow rate of the medium passing only through the first region 21 is q1, the flow rate of the medium passing through the first region 21 and the first sub-region 23 is q3, the flow rate of the medium passing through the first region 21, the first sub-region 23 and the second sub-region 24 is q4, and the flow rate of the medium passing through the first region 21, the first sub-region 23 and the second sub-region 24 is q5. The flow rate of the medium in region 23, the second sub-region 24 and the third sub-region 25 is q5, or the flow rate of the medium acting on the battery cell 50a overlapping the first region 21 is q1, the flow rate of the medium acting on the battery cell 50a overlapping the first region 21 and the first sub-region 23 is q3, the flow rate of the medium acting on the battery cell 50a overlapping the first region 21, the first sub-region 23 and the second sub-region 24 is q4, and the flow rate of the medium acting on the battery cell 50a overlapping the first region 21, the first sub-region 23, the second sub-region 24 and the third sub-region 25 is q5.

[0264] "q5 is greater than q4, q5 is greater than q3, q5 is greater than q1" can be understood as the flow rate of the medium acting on the battery cell 50a overlapping the first region 21, the first sub-region 23, the second sub-region 24 and the third sub-region 25 is relatively large for q5.

[0265] Optionally, in some embodiments, q4 > q3, q4 > q1.

[0266] For example, Q is 5.5 L / min, q1 can be 0.996 L / min, q3 can be 0.953 L / min, q4 can be 1.131 L / min, and q5 can be 2.423 L / min.

[0267] In the above scheme, by setting the flow rate through the third sub-region 25 to be greater than the flow rate through other regions, the medium can effectively exchange heat with the battery cells 50a in the third sub-region 25, thereby making the temperature difference between the battery cells 50a in the third sub-region 25 and the battery cells 50a in other regions smaller, which is conducive to improving the thermal management consistency of the battery device 100 and improving the reliability of the battery device 100.

[0268] According to some embodiments of this application, q5 is greater than or equal to 1.5 times q4 and less than or equal to 2.5 times q4.

[0269] Optionally, the sum of the flow rates q5 of the medium in the fourth branch channel 323 and the second main channel 33 is greater than the flow rate q4 of the medium in the third branch channel 322, and the relative relationship between the two is 1.5*q4≤q5≤2.5*q4. For example, the value of q5 can be 1.5*q4, 1.6*q4, 1.7*q4, 1.8*q4, 1.9*q4, 2*q4, 2.1*q4, 2.2*q4, 2.3*q4, 2.4*q4, 2.5*q4 or any value between two adjacent values.

[0270] For example, q4 is 1L / branch, and q5 can be 2L / minute.

[0271] In the above scheme, limiting the sum of the flow rates of the medium in the fourth branch channel 323 and the second main channel 33 to q5 to be greater than or equal to 1.5 times the flow rate q4 of the medium in the third branch channel 322 allows more medium to act on the battery cells 50a in the third sub-region 25, enabling the battery cells 50a furthest from the inlet 112 to receive effective heat exchange, thus ensuring that the temperature of the battery cells 50a in each region is consistent, thereby effectively reducing the risk of thermal runaway of the battery cells 50a, and thus improving the reliability of the battery device 100.

[0272] According to some embodiments of this application, please refer to Figure 5 The first battery cell assembly 50 includes a first row of battery cells 51 and a second row of battery cells 52 arranged adjacent to each other along the second direction y. Each row of battery cells includes a plurality of battery cells 50a arranged along the first direction x. A first heat exchange zone 20a is used to exchange heat between the first row of battery cells 51 and the second row of battery cells 52.

[0273] In some embodiments, the first battery cell assembly 50 includes multiple rows of battery cells, such as a first row of battery cells 51 and a second row of battery cells 52 arranged adjacent to each other along the second direction y.

[0274] The first row of battery cells 51 and the second row of battery cells 52 overlap with the first heat exchange zone 20a. The medium passing through the first heat exchange zone 20a can exchange heat between the first row of battery cells 51 and the second row of battery cells 52.

[0275] The first row of battery cells 51 and the second row of battery cells 52 each include the same or different numbers of battery cells 50a. For example, the first row of battery cells 51 and the second row of battery cells 52 each include the same number of battery cells 50a, and these battery cells 50a are arranged along a first direction x. For example, the first row of battery cells 51 includes 26 battery cells 50a arranged along the first direction x, and the second row of battery cells 52 also includes 26 battery cells 50a arranged along the first direction x.

[0276] In the above scheme, the first battery cell assembly 50 includes multiple rows of battery cells arranged along the second direction y, and each row of battery cells includes multiple battery cells 50a arranged along the first direction x, so that multiple branch flow channels can effectively exchange heat with each battery cell 50a, making the heat exchange of each battery cell 50a uniform, which is conducive to improving the heat exchange efficiency of the thermal management component 10 and making the battery device 100 have high reliability.

[0277] In some other embodiments, the first battery cell group 50 may include a row of battery cells.

[0278] According to some embodiments of this application, along the second direction y, the second row of battery cells 52 is located between the first row of battery cells 51 and the second battery cell assembly 60.

[0279] The phrase “Along the second direction y, the second row of battery cells 52 is located between the first row of battery cells 51 and the second battery cell group 60” can be understood as follows: Along the second direction y, the first row of battery cells 51, the second row of battery cells 52, and the second battery cell group 60 are arranged in sequence, with the first row of battery cells 51 on the outside and the second row of battery cells 52 on the inside.

[0280] According to some embodiments of this application, please refer to Figure 10 , Figure 10 This is a schematic diagram of the first flow channel 30, the first row of battery cells 51, and the second row of battery cells 52 in some embodiments of this application.

[0281] The first branch flow channel 320 includes a first inlet section 3201, a first intermediate section 3202, and a first outlet section 3203. The first intermediate section 3202 connects the first inlet section 3201 and the first outlet section 3203. The first inlet section 3201 overlaps with multiple battery cells 50a in the first row of battery cells 51, the first intermediate section 3202 overlaps with multiple battery cells 50a in the second row of battery cells 52, and the first outlet section 3203 overlaps with multiple battery cells 50a in the first row of battery cells 51.

[0282] Optionally, please see Figure 5 In the direction shown in the figure, the first row of battery cells 51 is above the second row of battery cells 52. When the medium enters the first flow channel 30, it first acts on the second row of battery cells 52. It can be understood that the first row of battery cells 51 is the outer row of battery cells, and the second row of battery cells 52 is the inner row of battery cells.

[0283] The first branch channel 320 includes a first inlet section 3201, a first intermediate section 3202 and a first outlet section 3203. The first intermediate section 3202 is located downstream of the first inlet section 3201. After the medium exchanges heat with the battery cell 50a in the first region 21, it flows through the first outlet section 3203 to the outlet 113.

[0284] Combination Figure 10 The phrase "the first inlet section 3201 overlaps with multiple battery cells 50a in the first row of battery cells 51, the first intermediate section 3202 overlaps with multiple battery cells 50a in the second row of battery cells 52, and the first outlet section 3203 overlaps with multiple battery cells 50a in the first row of battery cells 51" can be understood as follows: the medium in the first branch channel 320 can exchange heat with the outer row of battery cells (the first row of battery cells 51) through the first inlet section 3201, and then move inward, exchange heat with the inner row of battery cells 50a (the second row of battery cells 52) through the first intermediate section 3202, and then move outward again, flowing to the outlet 113 through the first outlet section 3203.

[0285] Optionally, please see Figure 10 The first main channel 32 corresponds to the area where the second row of battery cells 52 are located. The first inlet section 3201 is connected to the first main channel 32. The first inlet section 3201 first extends along the second direction y and passes through the first row of battery cells 51. Then it extends along the first direction x towards the second region 22 to act on the first row of battery cells 51 along the first direction x. Then it detours to the inside and acts on the first row of battery cells 51 again along the first direction x. Then it turns to the first intermediate section 3202. The first intermediate section 3202 acts on the second row of battery cells 52 and extends along the first direction x towards the second region 22 to the part of the first region 21 adjacent to the second region 22. Then it extends along the second direction y towards the first row of battery cells 51 to connect to the first outlet section 3203. The first outlet section 3203 passes through the first row of battery cells 51 and connects to the outlet 113.

[0286] In the above scheme, by setting a first inlet section 3201, a first intermediate section 3202, and a first outlet section 3203, for the first branch flow channel 320, the medium flows from the first row of battery cells 51 to the second row of battery cells 52, and then from the second row of battery cells 52 back to the first row of battery cells 51 and is discharged. This makes the heat exchange between the first row of battery cells 51 and the second row of battery cells 52 more uniform, reduces the temperature difference between the first row of battery cells 51 and the second row of battery cells 52, thereby improving the consistency of thermal management and thus improving the reliability of the battery device 100.

[0287] According to some embodiments of this application, the second branch flow channel 321 includes a second inlet section 3211, a second intermediate section 3212, and a second outlet section 3213. The second intermediate section 3212 connects the second inlet section 3211 and the second outlet section 3213. The second inlet section 3211 overlaps with a plurality of battery cells 50a in the first row of battery cells 51, the second intermediate section 3212 overlaps with a plurality of battery cells 50a in the second row of battery cells 52, and the second outlet section 3213 overlaps with a plurality of battery cells 50a in the first row of battery cells 51.

[0288] The second branch channel 321 includes a second inlet section 3211, a second intermediate section 3212, and a second outlet section 3213. The second intermediate section 3212 is located downstream of the second inlet section 3211. After the medium exchanges heat with the battery cell 50a in the first sub-region 23, it flows through the second outlet section 3213 to the outlet 113.

[0289] Combination Figure 10 The phrase "the second inlet section 3211 overlaps with multiple battery cells 50a in the first row of battery cells 51, the second intermediate section 3212 overlaps with multiple battery cells 50a in the second row of battery cells 52, and the second outlet section 3213 overlaps with multiple battery cells 50a in the first row of battery cells 51" can be understood as follows: the medium in the second branch channel 321 can exchange heat with the outer row of battery cells (the first row of battery cells 51) through the second inlet section 3211, and then move inward, exchange heat with the inner row of battery cells 50a (the second row of battery cells 52) through the second intermediate section 3212, and then move outward again, flowing to the outlet 113 through the second outlet section 3213.

[0290] Optionally, please see Figure 10 The first main channel 32 corresponds to the area where the second row of battery cells 52 is located. The second inlet section 3211 is connected to the first main channel 32. After passing through the first area 21, the second inlet section 3211 can extend along the second direction y and pass through the first row of battery cells 51. Then it extends along the first direction x towards the second sub-area 24 to act on the first row of battery cells 51 along the first direction x. Then it detours to the inside and acts on the first row of battery cells 51 again along the first direction x. Then it turns to the second intermediate section 3212. The second intermediate section 3212 acts on the second row of battery cells 52 and extends along the first direction x towards the second sub-area 24 to the part of the first sub-area 23 adjacent to the second sub-area 24. Then it extends along the second direction y towards the first row of battery cells 51 to connect to the second outlet section 3213. The second outlet section 3213 passes through the first row of battery cells 51 and connects to the outlet 113.

[0291] The above scheme, by setting a second inlet section 3211, a second intermediate section 3212, and a second outlet section 3213, for the second branch flow channel 321, allows the medium to flow from the first row of battery cells 51 to the second row of battery cells 52, and then from the second row of battery cells 52 back to the first row of battery cells 51 and out. This enables uniform heat exchange between the first row of battery cells 51 and the second row of battery cells 52, reduces the temperature difference between the first row of battery cells 51 and the second row of battery cells 52, thereby improving the consistency of thermal management and thus improving the reliability of the battery device 100.

[0292] According to some embodiments of this application, the second inlet section 3211 passes through the first sub-region 23, and the second intermediate section 3212 passes through the first sub-region 23.

[0293] In some embodiments, the second inlet section 3211 passes through the first sub-region 23, and the second intermediate section 3212 passes through the first sub-region 23. That is, the second inlet section 3211 can exchange heat with the battery cell 50a overlapping the first sub-region 23, and the second intermediate section 3212 can exchange heat with the battery cell 50a overlapping the first sub-region 23. In other words, in the first sub-region 23, the battery cell 50a located on the outer side can exchange heat with the medium better.

[0294] In the above scheme, by setting the second inlet section 3211 to pass through the first sub-region 23 and the second intermediate section 3212 to pass through the first sub-region 23, the heat exchange of the first row of battery cells 51 and the second row of battery cells 52 in the first sub-region 23 can be made uniform, reducing the temperature difference between the first row of battery cells 51 and the second row of battery cells 52 corresponding to the first sub-region 23, thereby improving the consistency of thermal management and thus improving the reliability of the battery device 100.

[0295] According to some embodiments of this application, on the same projection plane perpendicular to the overlap direction z of the thermal management component and the battery cell, the overlap area of ​​the projection of all battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30 is smaller than the overlap area of ​​the projection of all battery cells 50a overlapping with the second region 22 and the projection of the first flow channel 30.

[0296] The "overlapping area of ​​the projections of all battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30" can be understood as the heat exchange area, heat transfer area, or heat conduction area of ​​all battery cells 50a overlapping with the first region 21 and the first flow channel 30. Similarly, the "overlapping area of ​​the projections of all battery cells 50a overlapping with the second region 22 and the projection of the first flow channel 30" can be understood as the heat exchange area, heat transfer area, or heat conduction area of ​​all battery cells 50a overlapping with the second region 22 and the first flow channel 30.

[0297] For example, see Figure 8 Compared to the flow channel corresponding to the second region 22, the flow channel corresponding to the first region 21 is more sparse, that is, the flow channel in the second region 22 is more dense, so that the heat exchange area of ​​the battery cell 50a overlapping the surface of the second region 22 with the first flow channel 30 is greater than the heat exchange area of ​​the battery cell 50a overlapping the first flow channel 30 in the first region 21.

[0298] In the above scheme, by setting the overlap area of ​​the projection of all battery cells 50a overlapping with the second region 22 and the projection of the first flow channel 30 to be greater than the overlap area of ​​the projection of all battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30, more medium can act on the battery cells 50a in the second region 22, making the heat exchange of battery cells 50a in each region uniform, effectively reducing the risk of thermal runaway of battery cells 50a, and thus improving the reliability of the battery device 100.

[0299] According to some embodiments of this application, on the same projection plane perpendicular to the overlap direction z of the thermal management component and the battery cell, the area of ​​the projection of all battery cells 50a overlapping with the first region 21 is S1, and the area of ​​the overlap between the projection of all battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30 is s1M1, where M1 is greater than or equal to 43%S1 and less than or equal to 50%S1.

[0300] In some embodiments, the bottom surface of the battery cell 50a is disposed on the thermal management component 10. On the same projection plane perpendicular to the overlap direction z of the thermal management component and the battery cell, "the area of ​​the projection of all battery cells 50a overlapping the first region 21 is S1" can be understood as the sum of the areas of the bottom surfaces of all battery cells 50a overlapping the first region 21. "The area of ​​the overlap between the projection of all battery cells 50a overlapping the first region 21 and the projection of the first flow channel 30 is M1" can be understood as the heat exchange area, heat transfer area, or heat conduction area of ​​all battery cells 50a overlapping the first region 21 and the first flow channel 30.

[0301] The value of M1 can be 43%S1, 44%S1, 45%S1, 46%S1, 47%S1, 48%S1, 49%S1, 50%S1, or any value between two adjacent values.

[0302] For example, on the same projection plane perpendicular to the overlap direction z of the thermal management component and the first battery cell group, the area S1 of the projection of all battery cells 50a overlapping with the first region 21 can be 5000 plane centimeters, and the overlap area s1M1 of the projection of all battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30 can be 2250 plane centimeters.

[0303] In the above scheme, by limiting the overlap area M1 of the projections of all battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30 to be no less than 43% of the total area S1 of the projections of all battery cells 50a overlapping with the first region, the heat exchange efficiency of the medium to the battery cells 50a in the first region 21 can be guaranteed to a certain extent, reducing the risk of thermal runaway of the battery cells 50a in the first region 21. By limiting the overlap area M1 of the projections of the battery cells 50a overlapping with the first region 21 and the projection of the first flow channel 30 to be no greater than 50% of the total area S1 of the projections of all battery cells 50a overlapping with the first region 21, the medium in the first flow channel 30 can act more on the battery cells 50a in the second region 22, making the heat exchange of the battery cells 50a in each region uniform, effectively reducing the risk of thermal runaway of the battery cells 50a, and thus improving the reliability of the battery device 100.

[0304] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction z of the thermal management component and the battery cell, the total area of ​​the projection of all battery cells overlapping with the first sub-region 23 is S2, and the overlapping area of ​​the projection of all battery cells 50a overlapping with the first sub-region 23 and the projection of the first flow channel 30 is M2, where M2 is greater than or equal to 48%S2 and less than or equal to 55%S2.

[0305] In some embodiments, the bottom surface of the battery cell 50a is disposed on the thermal management component 10. On the same projection plane perpendicular to the overlap direction z of the thermal management component and the battery cell, "the total area of ​​the projections of all battery cells overlapping with the first sub-region 23 is S2" can be understood as the sum of the areas of the bottom surfaces of all battery cells 50a overlapping with the first sub-region. "The overlap area of ​​the projections of all battery cells 50a overlapping with the first sub-region 23 and the projection of the first flow channel 30 is M2" can be understood as the heat exchange area, heat transfer area, or heat conduction area of ​​all battery cells 50a overlapping with the first sub-region 23 and the first flow channel 30.

[0306] The value of M2 can be 48%S2, 49%S2, 50%S2, 51%S2, 52%S2, 53%S2, 54%S2, 55%S2, or any value between two adjacent values.

[0307] For example, on the same projection plane perpendicular to the overlap direction z of the thermal management component and the first battery cell group, the total projected area of ​​all battery cells overlapping with the first sub-region 23, S2 can be 5000 plane centimeters, and M2 can be 2500 plane centimeters.

[0308] In the above scheme, by limiting the overlap area M2 of the projections of all battery cells 50a overlapping with the first sub-region 23 and the projection of the first flow channel 30 to be no less than 48% of the total area S2 of the projections of all battery cells overlapping with the first sub-region, the heat exchange efficiency of the medium to the battery cells 50a in the first sub-region 23 can be guaranteed to a certain extent, reducing the risk of thermal runaway of the battery cells 50a in the first sub-region 23. By limiting the overlap area M2 of the projections of all battery cells 50a overlapping with the first sub-region 23 and the projection of the first flow channel 30 to be no greater than 55% of the total area S2 of the projections of all battery cells overlapping with the first sub-region, the medium in the first flow channel 30 can act more on the battery cells 50a in the second sub-region 24 and the third sub-region 25, thereby making the heat exchange of the battery cells 50a in each region uniform, effectively reducing the risk of thermal runaway of the battery cells 50a, and thus improving the reliability of the battery device 100.

[0309] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction z of the thermal management component and the battery cell group, the total area of ​​the projections of all battery cells 50a overlapping with the second sub-region 24 is S3, and the area of ​​the overlap between the projections of all battery cells 50a overlapping with the second sub-region 24 and the projection of the first flow channel 30 is M3, where M3 is greater than or equal to 53%S3 and less than or equal to 60%S3.

[0310] In some embodiments, the bottom surface of the battery cell 50a is disposed on the thermal management component 10. On the same projection plane perpendicular to the overlap direction z of the thermal management component and the first battery cell group, "the total area of ​​the projection of all battery cells 50a overlapping with the second sub-region 24 is S3" can be understood as the sum of the areas of the bottom surfaces of all battery cells 50a overlapping with the second sub-region 24. "The overlap area of ​​the projection of all battery cells 50a overlapping with the second sub-region 24 and the projection of the first flow channel 30 is M3" can be understood as the heat exchange area, heat transfer area, or heat conduction area of ​​all battery cells 50a overlapping with the second sub-region 24 and the first flow channel 30.

[0311] The value of M3 can be 53%S3, 54%S3, 55%S3, 56%S3, 57%S3, 58%S3, 59%S3, 60%S3, or any value between two adjacent values.

[0312] In the above scheme, by limiting the overlap area M3 of the projections of all battery cells 50a overlapping with the second sub-region 24 and the projection of the first flow channel 30 to be no less than 53% of the total area S3 of the projections of all battery cells overlapping with the second sub-region, the heat exchange efficiency of the medium to the battery cells 50a in the second sub-region 24 can be guaranteed to a certain extent, reducing the risk of thermal runaway of the battery cells 50a in the second sub-region 24. By limiting the overlap area M3 of the projections of all battery cells 50a overlapping with the second sub-region 24 and the projection of the first flow channel 30 to be no greater than 60% of the total area S3 of the projections of all battery cells overlapping with the second sub-region, the medium in the first flow channel 30 can act more on the battery cells 50a in the third sub-region 25, thereby making the heat exchange of the battery cells 50a in each region uniform, effectively reducing the risk of thermal runaway of the battery cells 50a, and thus improving the reliability of the battery device 100.

[0313] According to some embodiments of this application, on the same projection plane perpendicular to the overlapping direction z of the thermal management component and the battery cell group, the area of ​​the projection of the first battery cell group 50 is S4, and the overlapping area of ​​the projection of the first flow channel 30 and the projection of the first battery cell group 50 is M4, where M4 is greater than or equal to 45%S4 and less than or equal to 70%S4.

[0314] In some embodiments, "the projected area of ​​the first battery cell group 50 is S4" can be understood as the projected area of ​​all battery cells 50a in the first battery cell group 50, such as the total area of ​​the bottom surface of all battery cells 50a in the first battery cell group 50. "The overlapping area of ​​the projection of the first flow channel 30 and the projection of the first battery cell group 50 is M4" can be understood as the heat exchange area, heat transfer area, or heat conduction area of ​​the battery cells 50a overlapping the first heat exchange zone 20a and the first flow channel 30.

[0315] The value of M4 can be 45%S4, 46%S4, 47%S4, 48%S4, 49%S4, 50%S4...69%S4, 70%S4, or any value between two adjacent values.

[0316] For example, on the same projection plane perpendicular to the overlapping direction z of the thermal management component and the first battery cell group, the projected area S4 of the first battery cell group 50 is the total area of ​​the bottom surface of all battery cells 50a in the first battery cell group 50. The value of S4 can be 26000 plane centimeters, and the value of M4 can be 13000 plane centimeters.

[0317] In the above scheme, by limiting the overlapping area M4 of the projection of the first flow channel 30 and the projection of the first battery cell group 50 to not less than 45% and not more than 70% of the projection area S4 of the first battery cell group 50, the heat exchange of each battery cell 50a in the first battery cell group 50 can be uniform, effectively reducing the risk of thermal runaway of the battery cell 50a, thereby improving the reliability of the battery device 100.

[0318] According to some embodiments of this application, the battery device 100 further includes a housing body, a support portion 80, and a connector 73. The housing body has an opening, the thermal management component 10 closes the opening, and the thermal management component 10 and the housing body together form a space for accommodating the battery cell 50a. The support portion 80 is used to support the thermal management component 10, and the connector 73 connects the thermal management component 10 and the support portion 80.

[0319] In some embodiments, the thermal management component 10 and the housing body together constitute the housing 70 of the battery device 100. Exemplarily, the housing body is... Figure 3 The first box section 71 is shown.

[0320] In some embodiments, please combine Figure 3 , Figures 11-13 , Figure 11 This is an exploded perspective view of the thermal management component 10 and the support portion 80 in some embodiments of this application. Figure 12 This is a partial schematic diagram of the internal structure of the thermal management component 10 and the support portion 80 in some embodiments of this application. Figure 13 for Figure 12 Enlarged view of point A in the middle.

[0321] In some embodiments, the housing 70 may include a first housing portion 71 and a thermal management component 10. The first housing portion 71 has an opening and the first housing portion 71 and the thermal management component 10 cover each other. The first housing portion 71 and the thermal management component 10 together define an assembly space for accommodating the battery cell 50a.

[0322] The support portion 80 is a structural component that supports the thermal management component 10. The support portion 80 may include a frame 81 and a crossbeam 82. The frame 81 surrounds the edge of the thermal management component 10 and, together with the first housing portion 71, clamps and connects the thermal management component 10. For example, the edge of the thermal management component 10 forms a flange edge, the frame 81 is supported on the flange edge, and is connected to the first housing portion 71 by bolts.

[0323] The crossbeam 82 is located inside the frame 81 and is connected to the thermal management component 10 via the connector 73.

[0324] In some embodiments, the connector 73 connects the thermal management component 10 and the support portion 80. Exemplarily, the connector 73 can be a structural component such as an adhesive, threaded component, riveted component, or welded component.

[0325] Optionally, the connector 73 is a riveting member, specifically a rivet. In some embodiments, the connector 73 fixes the thermal management component 10 and the support portion 80 by a self-piercing riveting process.

[0326] In the above scheme, the support part 80 and the thermal management component 10 are connected by the connector 73, so that the support part 80 effectively supports the thermal management component 10, the thermal management component 10 stably supports the battery cell, the battery device 100 has high structural stability, and thus the battery device 100 has high reliability.

[0327] According to some embodiments of this application, the connector 73 is a riveted member, and the first flow channel 30 and the second flow channel 40 bypass the connector 73.

[0328] Please see Figure 4 and Figure 11 The first plate 110 of the thermal management component 10 has a mounting hole 114. The mounting hole 114 passes through the first plate 110 along the thickness direction of the thermal management component to allow the connector 73 to pass through, thereby fixing the thermal management component 10 to the support portion 80. The first flow channel 30 and the second flow channel 40 can bypass the mounting hole 114.

[0329] Optionally, there may be multiple mounting holes 114 for multiple connectors 73 to pass through.

[0330] "The first flow channel 30 and the second flow channel 40 bypass the mounting hole 114" can be understood as follows: with the mounting hole 114 as a reference, the first flow channel 30 and the second flow channel 40 are bent to avoid the mounting hole 114.

[0331] Optionally, please see Figure 8 The first branch channel 320 is formed with a plurality of first bends 320a to avoid the plurality of mounting holes 114 corresponding to the first region 21, and the second branch channel 321 is formed with a plurality of second bends 321a to avoid the plurality of mounting holes 114 corresponding to the first sub-region 23.

[0332] The above solution, on the one hand, the connector 73 rivets the support 80 and the thermal management component 10, which can effectively improve the connection quality between the thermal management component 10 and the support 80; on the other hand, since the flow channel bypasses the connector 73, the heat exchange area between the flow channel and the battery cell 50a can be increased, effectively improving the heat exchange efficiency of the thermal management component 10, and thus effectively improving the reliability of the battery device 100.

[0333] According to some embodiments of this application, the capacity of a single battery cell 50a is greater than or equal to 400Ah.

[0334] AH is an abbreviation for Ampere-hour, a unit of electrical energy used to describe a battery's ability to store electrical energy. 1 Ampere-hour (Ah) means that a battery can continuously provide 1 ampere of current for 1 hour.

[0335] In some embodiments, the capacity of a single battery cell 50a in the battery device 100 may be greater than or equal to 400AH, for example, the capacity of a single battery cell 50a may be 400AH, 500AH, 600AH, 700AH, 800AH, etc.

[0336] In the above scheme, by limiting the capacity of the battery cell 50a to be greater than or equal to 400Ah, the battery device 100 can have a large capacity. For the battery device 100 with a large energy capacity, by setting multiple branch channels in the thermal management component 10 to divert the medium and limiting the flow rate of different branch channels, the heat exchange efficiency of the thermal management component 10 for the battery cell 50a can be effectively improved, the temperature difference between battery cells 50a in different regions can be reduced, and the consistency of thermal management of the battery device 100 can be improved, thereby reducing the risk of thermal runaway of the battery device 100 and making the battery device 100 with such a large capacity battery cell 50a highly reliable.

[0337] In some other embodiments, the capacity of the battery cell 50a in the battery device 100 may be less than or 400AH, for example, the capacity of the battery cell 50a may be 100AH, 200AH, 300AH, 400AH, 500AH, etc.

[0338] Some embodiments of this application also provide an energy storage device 2000, which includes the battery device 100 provided above.

[0339] In some embodiments, the energy storage device 2000 may include an energy storage cabinet, an energy storage container, etc.

[0340] For example, please see Figure 2 The energy storage device 2000 can be an energy storage cabinet, which includes a cabinet body 2001 and multiple battery devices 100. The multiple battery devices 100 can be housed within the cabinet body 2001. The multiple battery devices 100 can be connected in series, in parallel, or in a mixed configuration.

[0341] Some embodiments of this application also provide an electrical device 1000, which includes the battery device 100 provided above.

[0342] For example, please see Figure 1The electrical device 1000 is a vehicle. Inside the vehicle, a controller 200, a motor 300, and a battery device 100 can be installed. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source for the vehicle's electrical system, such as for the power needs of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0343] Some embodiments of this application provide a battery device 100; please refer to [link to relevant documentation]. Figures 3-12 The battery device 100 includes a housing 70, a first battery cell assembly 50, a second battery cell assembly 60, and a thermal management component 10.

[0344] The housing 70 includes a first housing portion 71 and a second housing portion 72, which cover each other. A first battery cell assembly 50 and a second battery cell assembly 60 are disposed in the housing 70.

[0345] Optionally, the second housing portion 72 can be a thermal management component 10. The thermal management component 10 is connected to the first housing portion 71 via a support portion 80. The first battery cell assembly 50 and the second battery cell assembly 60 are disposed overlapping on the thermal management component 10.

[0346] Please see Figure 5 The first battery cell assembly 50 includes two rows of battery cells arranged along the second direction y. The two rows of battery cells include a first row of battery cells 51 and a second row of battery cells 52. Each row of battery cells includes a plurality of battery cells 50a arranged along the first direction x, for example, including 26 battery cells 50a. The first row of battery cells 51 and the second row of battery cells 52 are arranged along the second direction y, and the first direction x and the second direction y are perpendicular to each other.

[0347] The second battery cell assembly 60 includes two rows of battery cells arranged along the second direction y, and each row of battery cells includes a plurality of battery cells 50a arranged along the first direction x, for example, including 26 battery cells 50a.

[0348] Optionally, the battery device 100 includes 104 battery cells 50a, each battery cell 50a having a capacity greater than or equal to 400AH.

[0349] The thermal management component 10 includes a body 11 and a flow guide 12. The body 11 includes a first heat exchange zone 20a and a second heat exchange zone 20b, which are arranged along a second direction y. The first heat exchange zone 20a corresponds to a first battery cell assembly 50, which overlaps with the first heat exchange zone 20a. The second heat exchange zone 20b corresponds to a second battery cell assembly 60, which overlaps with the second heat exchange zone 20b.

[0350] The body 11 has an inlet 112 and an outlet 113, which are located on the same side of the body 11 along a first direction x. For example, in... Figure 5 In the main body 11, both the inlet 112 and the outlet 113 are located on the left side. The inlet 112 is located on the left side of the first heat exchange zone 20a, and the outlet 113 is located on the left side of the second heat exchange zone 20b.

[0351] The body 11 has a first flow channel 30 and a second flow channel 40 arranged in parallel inside. For example, the body 11 includes a first plate 110 and a second plate 111 stacked on top of each other. A groove 1100 is formed on the surface of the first plate 110 facing the second plate 111, and the second plate 111 covers the groove 1100 to form the first flow channel 30 and the second flow channel 40.

[0352] Optionally, along the second direction y, the distance between the water inlet 112 and the outer edge of the battery device 100 can be greater than or equal to 350 mm.

[0353] For example, along the second direction y, the battery device 100 has a first outer edge and a second outer edge opposite to each other, with the water inlet 112 closer to the first outer edge. The distance between the water inlet 112 and the first outer edge of the battery device 100 can be greater than or equal to 350 mm. A valve can be arranged in the space between the water inlet 112 and the first outer edge, and the valve can be provided on a pipe connected to the water inlet 112.

[0354] The first flow channel 30 passes through the first heat exchange zone 20a and is used for heat exchange of the first battery cell group 50. The second flow channel 40 passes through the second heat exchange zone 20b and is used for heat exchange of the second battery cell group 60.

[0355] The first flow channel 30 has a first main inlet channel 31 and a first main outlet channel 34. The second flow channel 40 has a second main inlet channel 41 and a second main outlet channel 42. The inlet 112 includes an inlet pipe 1120 and a main inlet section 1121 formed between the first plate 110 and the second plate 111. The main inlet section 1121 branches into the first flow channel 30 and the second flow channel 40. The inlet pipe 1120 is disposed on the second plate 111 and connected to the main inlet section 1121. The outlet 113 includes an outlet pipe 1130. The outlet pipe 1130 is disposed on the second plate 111 and connected to the second main outlet channel 42. The second plate 111 has a through hole 1110 and a second through hole 1111. The first through hole 1110 corresponds to the first main outlet channel 34, and the second through hole 1111 corresponds to the second main outlet channel 42. The guide member 12 is disposed on the side of the second plate 111 away from the first plate 110 and connects the first through hole 1110 and the second through hole 1111 to connect the first main outlet channel 34 and the second main outlet channel 42. The second main outlet channel 42 is connected to the outlet 113.

[0356] Please see Figures 4-6 Along the second direction y, the first main inlet channel 31 and the second main inlet channel 41 are located between the first main outlet channel 34 and the second main outlet channel 42. This allows the medium to enter from the middle of the battery device 100, be diverted to the first channel 30 and the second channel 40, and exchange heat with the battery cells 50a corresponding to the first heat exchange zone 20a and the second heat exchange zone 20b respectively. It also allows the medium to exit from both sides of the battery device 100, thus rationally planning the medium flow path and minimizing the temperature difference between the battery cells 50a in the middle and those on the outer sides, improving the consistency of thermal management.

[0357] In some embodiments of this application, the first flow channel 30 and the second flow channel 40 each include multiple branch flow channels, which divide the medium to uniformly exchange heat on the battery cell 50a. Some embodiments of this application are mainly described with reference to the first flow channel 30 and the first heat exchange zone 20a; the second flow channel 40 and the second heat exchange zone 20b can be understood with reference to these components.

[0358] The first heat exchange zone 20a includes a first region 21, a first sub-region 23, a second sub-region 24, and a third sub-region 25 arranged along a first direction x. The inlet 112 and outlet 113 are located on the side of the first region 21 opposite to the first sub-region 23. Optionally, the first 40%-60% of the battery cells 50a in the first battery cell group 50 overlaps with the first region 21, the subsequent 20%-30% of the battery cells 50a overlaps with the first sub-region 23, and the remaining battery cells 50a overlap with the second sub-region 24 and the third sub-region 25. For example, the number of battery cells 50a overlapping in the second region 22 and the third region is approximately the same, each accounting for half.

[0359] The first flow channel 30 includes a first main inlet channel 31, a first main flow channel 32, a second main flow channel 33, a first branch flow channel 320, a second branch flow channel 321, a third branch flow channel 322, a fourth branch flow channel 323, and a first main outlet channel 34. The first main inlet channel 31 is connected to the inlet 112. The first main flow channel 32 and the second main flow channel 33 are branch flow channels of the first main inlet channel 31. The first branch flow channel 320, the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323 are branch flow channels of the first main flow channel 32. The second main flow channel 33, the first branch flow channel 320, the second branch flow channel 321, the third branch flow channel 322, and the fourth branch flow channel 323 are connected to the outlet 113 through the first main outlet channel 34.

[0360] The first branch flow channel 320 passes through the first region 21 but not through the first sub-region 23, the second sub-region 24, or the third sub-region 25. The second branch flow channel 321 passes through the first region 21 and the first sub-region 23 but not through the second sub-region 24 or the third sub-region 25. The third branch flow channel 322 passes through the first region 21, the first sub-region 23, and the second sub-region 24 but not through the third sub-region 25. The fourth branch flow channel 323 passes through the first region 21, the first sub-region 23, the second sub-region 24, and the third sub-region 25.

[0361] The second main channel 33 passes through the first region 21, the first sub-region 23, the second sub-region 24 and the third sub-region 25, and the second main channel 33 and the fourth branch channel 323 merge into the third sub-region 25.

[0362] Optionally, the total flow rate of the medium in the first flow channel 30 is Q. The flow rate of the medium in the first branch flow channel 320 is q1, the flow rate of the medium in the second branch flow channel 321 is q3, the flow rate of the medium in the third branch flow channel 322 is q4, and the sum of the flow rates of the medium in the fourth branch flow channel 323 and the second main flow channel 33 is q5. This satisfies the following conditions: 15%Q≤q1≤25%Q, 15%Q≤q3≤25%Q, q5>q4, q5>q3, q5>q1. Optionally, 1.5*q4≤q5≤2.5*q4.

[0363] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., 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: A battery cell assembly, comprising multiple battery cells; A thermal management component includes a body, the body comprising an inlet, an outlet, and a heat exchange zone for exchanging heat with the battery cell assembly, the inlet and the outlet being located on one side of the heat exchange zone along a first direction; the heat exchange zone includes a first heat exchange zone and a second heat exchange zone arranged along a second direction, the body having a first flow channel and a second flow channel, the first flow channel passing through the first heat exchange zone, the second flow channel passing through the second heat exchange zone, the first flow channel and the second flow channel being connected in parallel between the inlet and the outlet, the first direction and the second direction intersecting; The first flow channel includes a first main inlet flow channel and a first main outlet flow channel; the second flow channel includes a second main inlet flow channel and a second main outlet flow channel, and along the second direction, the first main inlet flow channel and the second main inlet flow channel are located between the first main outlet flow channel and the second main outlet flow channel.

2. The battery device according to claim 1, characterized in that, The thermal management component further includes a flow guide. Along the first direction, the flow guide, the inlet, and the outlet are located on the same side of the heat exchange zone. The first main outlet channel is connected to the second main outlet channel through the flow guide, and the second main outlet channel is connected to the outlet.

3. The battery device according to claim 2, characterized in that, Along the first direction, the water inlet is located on the side of the guide member away from the battery cell assembly.

4. The battery device according to claim 2, characterized in that, The body includes a first plate and a second plate, which are stacked on top of each other, and a first flow channel and a second flow channel are formed between the first plate and the second plate; The flow guide is located on the side of the second plate away from the first plate, and a flow guide channel is formed between the flow guide and the second plate. The first main outlet channel is connected to the second main outlet channel through the flow guide channel.

5. The battery device according to claim 4, characterized in that, The second plate has a first through hole and a second through hole. The first through hole connects the flow guide channel and the first main outlet channel, and the second through hole connects the flow guide channel and the second main outlet channel.

6. The battery device according to claim 4, characterized in that, Along the stacking direction of the first plate and the second plate, a groove is formed on the side of the first plate facing the second plate, the battery cell is located on the side of the second plate away from the first plate, and the second plate covers the groove to form the first flow channel and the second flow channel.

7. The battery device according to claim 1, characterized in that, Along the first direction, the water inlet is located on one side of the first heat exchange zone, and the water outlet is located on one side of the second heat exchange zone.

8. The battery device according to claim 2, characterized in that, Along the second direction, the first main outlet is located on one side of the inlet, and the second main outlet and the outlet are both located on the other side of the inlet.

9. The battery device according to claim 8, characterized in that, The cross-sectional area of ​​the first main inlet channel is larger than that of the second main inlet channel.

10. The battery device according to claim 1, characterized in that, The battery cell assembly includes a first battery cell assembly and a second battery cell assembly, wherein the first heat exchange zone is used to exchange heat for the first battery cell assembly, and the second heat exchange zone is used to exchange heat for the second battery cell assembly.

11. The battery device according to claim 10, characterized in that, The first heat exchange zone includes a first region and a second region arranged along the first direction, and the water inlet is located on the side of the first region away from the second region; The first flow channel includes multiple branch flow channels, which connect the first main inlet flow channel and the first main outlet flow channel. At least one branch flow channel passes through the first region but not the second region, and at least one branch flow channel passes through both the first region and the second region. The flow rate of the medium in the branch channel that passes through the first region but not the second region is less than the flow rate of the medium in the branch channel that passes through both the first region and the second region.

12. The battery device according to claim 11, characterized in that, The first battery cell assembly includes N battery cells, the number of battery cells overlapping with the first region is a, a is greater than or equal to 40%N and less than or equal to 60%N; the number of battery cells overlapping with the second region is b, b is greater than or equal to 40%N and less than or equal to 60%N, the sum of a and b is equal to N, and a and b are both integers greater than or equal to 1.

13. The battery device according to claim 12, characterized in that, The total flow rate of the medium in the first flow channel is Q; The flow rate of the medium in the branch channel that passes through the first region but not the second region is q1, where q1 is greater than or equal to 15%Q and less than or equal to 25%Q.

14. The battery device according to claim 11, characterized in that, The number of branch channels that pass through the first region but not the second region is less than the number of branch channels that pass through both the first region and the second region.

15. The battery device according to claim 14, characterized in that, The plurality of branch channels include a first branch channel and a second branch channel. The first branch channel passes through the first region but does not pass through the second region, while the second branch channel passes through both the first region and the second region. The first branch channel and the second branch channel are arranged in parallel.

16. The battery device according to claim 15, characterized in that, The first flow channel further includes a first main flow channel and a second main flow channel, with one end of the first main flow channel and one end of the second main flow channel both connected to the first main flow channel; The first branch flow channel and the second branch flow channel are branch flow channels of the first main flow channel; The second main channel passes through the first region and the second region.

17. The battery device according to claim 16, characterized in that, The second region includes a first sub-region, a second sub-region, and a third sub-region arranged along the first direction, wherein the first sub-region is located between the first region and the second sub-region, and the second sub-region is located between the first sub-region and the third sub-region. The plurality of branch channels also includes a third branch channel and a fourth branch channel; The second branch channel passes through the first region and the first sub-region but does not pass through the second sub-region and the third sub-region; the third branch channel passes through the first region, the first sub-region and the second sub-region but does not pass through the third sub-region; and the fourth branch channel passes through the first region, the first sub-region, the second sub-region and the third sub-region.

18. The battery device according to claim 17, characterized in that, The first branch channel, the second branch channel, the third branch channel, and the fourth branch channel are branch channels of the first main channel.

19. The battery device according to claim 17, characterized in that, The second main flow channel and the fourth branch flow channel converge in the third sub-region.

20. The battery device according to claim 17, characterized in that, The first battery cell group comprises N battery cells, and the number of battery cells overlapping with the first sub-region is c, where c is greater than or equal to 20%N and less than or equal to 30%N, and c is an integer greater than or equal to 1.

21. The battery device according to claim 20, characterized in that, The total flow rate of the medium in the first flow channel is Q, and the flow rate of the medium in the second branch flow channel is q3, where q3 is greater than or equal to 15%Q and less than or equal to 25%Q.

22. The battery device according to claim 18, characterized in that, The flow rate of the medium in the first branch channel is q1, the flow rate of the medium in the second branch channel is q3, the flow rate of the medium in the third branch channel is q4, and the sum of the flow rates of the medium in the fourth branch channel and the second main channel is q5. q5 is greater than q4, q5 is greater than q3, and q5 is greater than q1.

23. The battery device according to claim 22, characterized in that, q5 is greater than or equal to 1.5 times q4 and less than or equal to 2.5 times q4.

24. The battery device according to claim 17, characterized in that, The first battery cell assembly includes a first row of battery cells and a second row of battery cells arranged adjacent to each other along the second direction. Each row of battery cells includes a plurality of battery cells arranged along the first direction. The first heat exchange zone is used to exchange heat between the first row of battery cells and the second row of battery cells.

25. The battery device according to claim 24, characterized in that, Along the second direction, the second row of battery cells is located between the first row of battery cells and the second battery cell assembly.

26. The battery device according to claim 25, characterized in that, The first branch channel includes a first inlet section, a first intermediate section, and a first outlet section, wherein the first intermediate section connects the first inlet section and the first outlet section; The first inlet section overlaps with multiple battery cells in the first row of battery cells, the first middle section overlaps with multiple battery cells in the second row of battery cells, and the first outlet section overlaps with multiple battery cells in the first row of battery cells.

27. The battery device according to claim 25, characterized in that, The second branch flow channel includes a second inlet section, a second intermediate section, and a second outlet section. The second intermediate section connects the second inlet section and the second outlet section. The second inlet section overlaps with multiple battery cells in the first row of battery cells, the second intermediate section overlaps with multiple battery cells in the second row of battery cells, and the second outlet section overlaps with multiple battery cells in the first row of battery cells.

28. The battery device according to claim 27, characterized in that, The second inlet section passes through the first sub-region, and the second intermediate section passes through the first sub-region.

29. The battery device according to claim 17, characterized in that, On the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell, the overlapping area of ​​the projections of all the battery cells overlapping with the first region and the projection of the first flow channel is smaller than the overlapping area of ​​the projections of all the battery cells overlapping with the second region and the projection of the first flow channel.

30. The battery device according to claim 29, characterized in that, On the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell, the total area of ​​the projections of all the battery cells overlapping with the first region is S1, and the overlapping area of ​​the projections of all the battery cells overlapping with the first region and the projection of the first flow channel is M1, where M1 is greater than or equal to 43%S1 and less than or equal to 50%S1.

31. The battery device according to claim 29, characterized in that, On the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell, the total area of ​​the projections of all battery cells overlapping with the first sub-region is S2, and the overlapping area of ​​the projections of all battery cells overlapping with the first sub-region and the projection of the first flow channel is M2, where M2 is greater than or equal to 48%S2 and less than or equal to 55%S2.

32. The battery device according to claim 29, characterized in that, On the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell group, the total area of ​​the projections of all the battery cells overlapping with the second sub-region is S3, and the overlapping area of ​​the projections of all the battery cells overlapping with the second sub-region and the projection of the first flow channel is M3, where M3 is greater than or equal to 53%S3 and less than or equal to 60%S3.

33. The battery device according to claim 10, characterized in that, On the same projection plane perpendicular to the overlapping direction of the thermal management component and the battery cell group, the area of ​​the projection of the first battery cell group is S4, and the overlapping area of ​​the projection of the first flow channel and the projection of the first battery cell group is M4, where M4 is greater than or equal to 45%S4 and less than or equal to 70%S4.

34. The battery device according to claim 1, characterized in that, The battery device also includes a housing body, a support part, and a connector. The housing body has an opening, and the thermal management component closes the opening. The thermal management component and the housing body together form a space for accommodating the battery cell. The support portion is located on the side of the thermal management component opposite to the housing body. The support portion is used to support the thermal management component. The connector connects the thermal management component and the support portion.

35. The battery device according to claim 34, characterized in that, The connector is a riveted connector, and the first flow channel and the second flow channel bypass the connector.

36. The battery device according to any one of claims 1-35, characterized in that, The battery cell has a capacity greater than or equal to 400Ah.

37. An energy storage device, characterized in that, Includes the battery device according to any one of claims 1-36.

38. An electrical device, characterized in that, Includes the battery device according to any one of claims 1-36.

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