Thermal management board, enclosure components and battery pack

Abstract

This application provides a thermal management board, a housing assembly, and a battery pack. The thermal management board includes a plate having a bearing surface, an air inlet, an air duct, and an exhaust hole group. The exhaust hole group is disposed on the bearing surface, and the air duct is disposed within the plate. The air duct includes an air inlet space and multiple first flow channels communicating with the exhaust hole group. The air inlet communicates with the first flow channels through the air inlet space. Through the above solution, the airflow from the air inlet first enters the air inlet space, and then the airflow is divided within the air inlet space, allowing the airflow within the air inlet space to be synchronously guided to each of the first flow channels. This improves the uniformity of the pressure at the air inlet end of each first flow channel, thereby improving the uniformity of the airflow entering each first flow channel, and further improving the uniformity of the airflow entering the battery pack from the corresponding exhaust hole group within each first channel. This reduces the difference in airflow volume between the exhaust holes of the exhaust hole group, thus improving the heat exchange uniformity of the battery cells and reducing the temperature difference between the battery cells.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a thermal management board, a housing assembly, and a battery pack. Background Technology

[0002] The battery pack includes a housing assembly with a mounting cavity and battery modules disposed within the mounting cavity. Each battery module comprises multiple electrically connected cells. During use, excessively high or low operating temperatures can negatively impact the normal operation of the cells. Therefore, temperature management of the cells is necessary, such as cooling or heating them to ensure they operate at a suitable temperature.

[0003] In related technologies, ventilation is used to manage the temperature of the battery cells. Specifically, an air inlet, air duct, and multiple exhaust holes are provided on the bottom plate of the housing assembly, and an air outlet is provided on the cover plate of the housing assembly. Airflow is delivered into the mounting cavity through the air inlet, air duct, and exhaust holes, allowing the airflow to contact the battery cells for heat exchange. This achieves temperature management of the battery cells. Then, the airflow in the mounting cavity is discharged from the exhaust holes. Because the longer the airflow travels through the air duct, the greater the pressure loss along the way, and the lower the remaining static and dynamic pressure in the air duct; and because the airflow decreases with each exhaust hole, the velocity of the remaining airflow in the air duct decreases. As a result, there is a large difference in the airflow between the exhaust holes, leading to a large difference in the heat exchange efficiency of some battery cells, resulting in poor heat exchange uniformity between battery cells. This has an adverse impact on the reliability of the battery pack. Utility Model Content

[0004] Embodiments of this application provide a thermal management board, a housing assembly, and a battery pack, which can improve the heat exchange uniformity of the cells, reduce the temperature difference between the cells, and thus improve the reliability of the battery pack.

[0005] In a first aspect, embodiments of this application provide a thermal management board, which includes a plate having a bearing surface, an air inlet, an air duct, and an exhaust hole group. The air inlet is disposed on the outer surface of the plate, the exhaust hole group is disposed on the bearing surface, and the air duct is disposed inside the plate. The air duct includes an air inlet space and multiple first flow channels. The air inlet communicates with the multiple first flow channels through the air inlet space. The multiple first flow channels are sequentially arranged along a first direction, which is perpendicular to the extension direction of the first flow channels and parallel to the bearing surface. The exhaust hole group communicates with the first flow channels. This allows airflow from the air inlet to first enter the air inlet space, and then the airflow is diverted through the air inlet space, so that the airflow in the air inlet space is synchronously guided to each of the first flow channels. This improves the uniformity of the pressure at the air inlet end of each first flow channel, thereby improving the uniformity of the airflow entering each first flow channel, and further improving the uniformity of the airflow in each first channel entering the battery pack from the corresponding exhaust hole group. This reduces the difference in airflow between the various exhaust vents in the exhaust vent group, which helps improve the heat exchange uniformity of the cells and reduce the temperature difference between the cells, thereby improving the reliability of the battery pack.

[0006] In some embodiments, the air intake space has a first edge near the first flow channels, with at least the middle portion of the first edge protruding between the plurality of first flow channels. This improves the consistency of the spacing between each first flow channel and the air inlet, ensuring that airflow entering the air intake space from the air inlet travels along similar or equal-length paths before entering the corresponding first flow channel. This improves the uniformity of airflow entering each first flow channel, thereby enhancing the uniformity of airflow entering the battery pack from the corresponding exhaust port group within each first channel.

[0007] In some embodiments, the first edge is an arc-shaped structure protruding towards the first flow channel. This creates a "duffel"-like structure on the side of the air intake space near the first flow channel, reducing turbulence caused by sharp turns or abrupt changes in cross-section. This allows the airflow in the air intake space near the first edge to flow smoothly along an arc to the inlet of the adjacent first flow channel after being blocked by the partition between the first flow channels. This improves the smoothness of the airflow entering each first flow channel and helps balance the inlet velocity of each first flow channel.

[0008] In some embodiments, on a projection plane parallel to the bearing surface, the projection of the center point of the air inlet lies within the projection of the symmetry line of the first edge. This improves the consistency of the spacing between each first flow channel and the air inlet, ensuring that the airflow entering the air intake space through the air inlet travels along similar or equal-length paths before entering the corresponding first flow channel.

[0009] In some embodiments, the air duct further includes a meandering space and multiple second flow channels. Along a first direction, the multiple second flow channels are arranged side-by-side on one side of the multiple first flow channels. The meandering space is located at the end of the first flow channel away from the air inlet space. The end of the first flow channel away from the air inlet space is connected to the end of the second flow channel away from the air inlet space through the meandering space. Some exhaust hole groups are connected to the first flow channels, and some exhaust hole groups are connected to the second flow channels. In this way, while controlling the number of first flow channels to ensure good air inlet uniformity in each first flow channel, by setting up the meandering space and second flow channels, the length of the air duct in the airflow trajectory can be increased, so that the air duct can cover the bearing surface of the thermal management plate, thereby allowing the surface of the thermal management plate facing the battery cell to be uniformly vented, and thus improving the uniformity of heat exchange in the battery cell.

[0010] In some embodiments, the meandering space has a second edge adjacent to the first and second flow channels, with at least the middle portion of the second edge protruding between the plurality of first and second flow channels. Thus, the middle portion of the meandering space has a larger dimension along the length of the first flow channels, allowing the first flow channels adjacent to the second flow channels to have a larger buffer space along their own length. This facilitates improved airflow smoothness from the first flow channels adjacent to the second flow channels into the second flow channels, thereby enhancing the uniformity of airflow in each of the second flow channels.

[0011] In some embodiments, the second edge is an arc-shaped structure protruding towards the adjacent portion between the first and second flow channels. This allows the length variation of the meandering space along the length of the first flow channel to be relatively gradual, thereby improving the stress state of the thermal management plate and preventing stress concentration.

[0012] In some embodiments, the ends of the plurality of first flow channels communicating with the detour space are mirror images of the ends of the plurality of second flow channels communicating with the detour space. This can help improve the structural symmetry of the plate, thereby improving the stress state of the thermal management plate and enhancing its reliability.

[0013] In some embodiments, there are two air ducts and two air inlets. Each air duct is connected to an air inlet, and the two air ducts are mirror images of each other. The second flow channels of the two air ducts are arranged close to each other. In this way, air can be delivered to the exhaust hole group through multiple air ducts, which can help improve the uniformity of airflow from the exhaust hole group and thus improve the uniformity of cell temperature.

[0014] In some embodiments, each air duct further includes a subspace located at the end of the second flow channel away from the detour space. The subspaces of the two air ducts are interconnected to form a connected space, and the second flow channel of each air duct is connected to the subspace. In this way, the airflow in the higher-pressure air duct can compensate for the airflow in the lower-pressure air duct, thereby balancing the pressure in the two air ducts and improving the uniformity of airflow from each exhaust hole of the exhaust hole group, which is beneficial to improving the uniformity of heat exchange of the battery cell.

[0015] In some embodiments, the connecting space has a third edge adjacent to the second flow channels of the two air ducts, and at least the middle portion of the third edge protrudes between the second flow channels of the two air ducts. This results in the middle portion of the connecting space having a larger dimension along the length of the second flow channels, thereby allowing the second flow channel of one air duct adjacent to the other air duct to have a larger buffer space along its own length. This facilitates the smooth flow of airflow from the second flow channel of one air duct into the second flow channel of the other air duct, thereby improving the uniformity of airflow.

[0016] In some embodiments, the third edge is an arc-shaped structure protruding towards the adjacent portion between the two air ducts. This allows for a more gradual change in the length of the connecting space along the length of the second flow channel, thereby improving the stress state of the thermal management plate and preventing stress concentration.

[0017] In some embodiments, the exhaust port group includes a plurality of first port groups, which are spaced apart along the extension direction of the first flow channel. Each first port group includes a plurality of first air holes, which are spaced apart along a first direction; wherein the first air holes are connected to the first flow channel. This improves the uniformity of airflow directed by the thermal management board to each battery cell, thereby improving the heat exchange uniformity of the battery cells.

[0018] In some embodiments, the exhaust port group includes a plurality of second port groups, which are spaced apart along a first direction; each second port group includes a plurality of second air holes, which are spaced apart along the extension direction of the first flow channel; wherein the second air holes are connected to the first flow channel. This improves the uniformity of airflow directed by the thermal management board to each battery cell, thereby improving the heat exchange uniformity of the battery cells.

[0019] In some embodiments, the sheet metal includes a first plate, a second plate, an edge sealing ring, and a plurality of first partitions; the second plate is parallel to and opposite to the first plate, and the surface of the second plate facing away from the first plate is a bearing surface; the edge sealing ring is disposed between the first plate and the second plate to jointly enclose an inner cavity; the plurality of first partitions are disposed in the inner cavity to divide a portion of the inner cavity into a plurality of first flow channels; wherein, an air inlet is disposed on one of the first plate, the second plate, and the edge sealing ring, and is located at one end of a first partition, and the portion of the inner cavity between the first flow channels and the air inlet is an air intake space. This makes the sheet metal a composite component, thereby reducing the difficulty of forming the flow channels and improving the manufacturing efficiency of the sheet metal.

[0020] In some embodiments, the thermal management board further includes an air inlet duct, one end of which is connected to the board, and the inner hole of the air inlet duct communicates with the air inlet. This allows for quick connection of the air inlet to external piping via the air inlet duct, thereby improving the ease of connecting the thermal management board to other components.

[0021] Secondly, embodiments of this application provide a housing assembly including a cover and the aforementioned thermal management plate; the cover and the thermal management plate overlap to define an installation cavity. This reduces the difference in airflow between the various exhaust vents in the exhaust vent group, thereby improving the heat exchange uniformity of the battery cells, reducing the temperature difference between the cells, and ultimately improving the reliability of the battery pack.

[0022] Thirdly, embodiments of this application provide a battery pack, which includes a battery module and the aforementioned housing assembly; the battery module is disposed in the mounting cavity. This reduces the difference in airflow between the various exhaust vents in the exhaust vent group, thereby improving the uniformity of heat exchange between the battery cells, reducing the temperature difference between the cells, and thus improving the reliability of the battery pack.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] In the embodiments of this application, by setting the thermal management plate of this structure, the airflow from the air inlet first enters the air intake space, and then the airflow is split through the air intake space, so that the airflow in the air intake space is synchronously guided to each first flow channel, which helps to improve the uniformity of the air intake end of each first flow channel, thereby improving the uniformity of the airflow entering each first flow channel, and further improving the uniformity of the airflow in each first channel entering the battery pack from the corresponding exhaust hole group. In this way, the difference in air volume between each exhaust hole of the exhaust hole group can be reduced, which helps to improve the heat exchange uniformity of the cells, reduce the temperature difference between cells, and thus help to improve the reliability of the battery pack. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the thermal management plate provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the internal structure of the thermal management plate provided in an embodiment of this application;

[0028] Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle;

[0029] Figure 4 yes Figure 2 A magnified structural diagram of part B in the middle section;

[0030] Figure 5 yes Figure 2 A magnified structural diagram of section C;

[0031] Figure 6 yes Figure 1 A magnified structural diagram of section D;

[0032] Figure 7 This is a structural schematic diagram of the housing assembly provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of the battery pack structure provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 20-Thermal management plate; 21-Panel; 211-Air inlet; 212-Bearing surface; 213-First plate; 214-Second plate; 215-Edge sealing ring; 216-First partition; 217-Second partition;

[0036] 22-Airflow duct; 221-First flow channel; 222-Second flow channel; 223-Air intake space; 2231-First edge; 224-Detour space; 2241-Second edge; 225-Connecting space; 2251-Third edge; 2252-Subspace;

[0037] 23-Exhaust vent group; 231-First vent group; 2311-First vent; 232-Second vent group; 2321-Second vent;

[0038] 24-Air inlet duct;

[0039] 100 - Enclosure assembly; 101 - Mounting cavity; 10 - Enclosure cover;

[0040] 1000-battery pack;

[0041] 300 - Battery module; 301 - Battery cell; 302 - Connector bar. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and 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.

[0043] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, "inner" and "outer" refer to the outline of the device.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only the elements expressly listed, but also other elements not expressly listed, or elements inherent to such a product.

[0047] The following combination Figures 1 to 8 The thermal management plate 20, the housing assembly 100, and the battery pack 1000 provided in the embodiments of this application will be described in detail.

[0048] Please see Figure 1 and Figure 2 , Figure 1This is a schematic diagram of the structure of the thermal management plate 20 provided in an embodiment of this application. Figure 2 This is a schematic diagram of the internal structure of a thermal management plate 20 provided in an embodiment of this application. In a first aspect, an embodiment of this application provides a thermal management plate 20. The thermal management plate 20 includes a plate 21. The plate 21 has a bearing surface 212, an air inlet 211, an air duct 22, and an exhaust hole group 23. The air inlet 211 is disposed on the outer surface of the plate 21. The exhaust hole group 23 is disposed on the bearing surface 212. The air duct 22 is disposed inside the plate 21. The air duct 22 includes an air inlet space 223 and a plurality of first flow channels 221. The air inlet 211 is connected to one end of the plurality of first flow channels 221 through the air inlet space 223. The plurality of first flow channels 221 are arranged sequentially along a first direction. The first direction is perpendicular to the extension direction of the first flow channels 221 and parallel to the bearing surface 212. The exhaust hole group 23 is connected to the first flow channels 221.

[0049] The air inlet 211 is disposed on the outer surface of the plate 21, specifically on the bearing surface 212. For example, the air inlet 211 is disposed on the side of the bearing surface 212 near the edge. Thus, when the thermal management plate 20 is applied to the housing assembly 100, the air inlet 211 is located outside the mounting cavity 101 of the housing assembly 100, facilitating the connection between the air inlet 211 and the air intake pipe.

[0050] It is understandable that the air inlet 211 can also be located on other outer surfaces of the plate 21. There is no limitation on where the air inlet 211 is specifically located on the plate 21; it can be set according to the actual application.

[0051] It is understood that the first flow channel 221 can be a recess directly formed on the plate 21, or it can be formed by dividing the inner cavity of the plate 21 through a partition.

[0052] Specifically, a plurality of first flow channels 221 are arranged along one side line of the bearing surface 212. For example, the plurality of first flow channels 221 are arranged sequentially along the width direction of the bearing surface 212, or the plurality of first flow channels 221 are arranged sequentially along the length direction of the bearing surface 212.

[0053] It is understood that the exhaust port group 23 includes multiple through holes that connect the air duct 22 to the outside, that is, the exhaust port group 23 connects the air duct 22 to the space inside the battery pack 1000 where the battery module 300 is installed.

[0054] For ease of understanding, the application of the thermal management plate 20 to the housing assembly 100 of the battery pack 1000 is illustrated by way of example. When the thermal management plate 20 is applied to the housing assembly 100, the thermal management plate 20 serves as the base plate of the housing assembly 100, and the bearing surface 212 supports the battery module 300. An air outlet is provided on the cover 10 of the housing assembly 100. For temperature management of the battery pack 1000, airflow is introduced into the air inlet space 223 through the air inlet 211, and then the airflow is introduced into each of the first flow channels 221 through the air inlet space 223. The airflow entering the first flow channels 221 flows into the vicinity of the battery module 300 through the exhaust hole group 23 to directly or indirectly contact the battery cells 301, thereby managing the temperature of the battery cells 301. Then, the airflow is discharged through the air outlet. The discharged airflow can flow back to the air supply equipment through a pipe.

[0055] In this embodiment, by setting the thermal management plate 20 of this structure, the airflow from the air inlet 211 first enters the air inlet space 223, and then the airflow is split through the air inlet space 223, so that the airflow in the air inlet space 223 is synchronously guided to each first flow channel 221, which helps to improve the uniformity of the air inlet pressure of each first flow channel 221, thereby improving the uniformity of the airflow entering each first flow channel 221, and further improving the uniformity of the airflow in each first channel entering the battery pack 1000 from the corresponding exhaust hole group 23. In this way, the difference in air volume between each exhaust hole of the exhaust hole group 23 can be reduced, which helps to improve the heat exchange uniformity of the battery cell 301, reduce the temperature difference between the battery cells 301, and thus help to improve the reliability of the battery pack 1000.

[0056] Furthermore, since the airflow velocity entering the air duct 22 from the air inlet 211 is high, the air inlet space 223 can be set to increase the airflow cross-section, buffer the airflow, and guide the airflow to enter the duct smoothly. In this way, the airflow can be prevented from directly impacting the wall of the first duct 221, thereby reducing wind noise.

[0057] Please see Figure 3 , Figure 3 yes Figure 2 An enlarged structural schematic diagram of part A. In some embodiments, the air inlet space 223 has a first edge 2231 near the first flow channel 221, and at least the middle portion of the first edge 2231 protrudes between the plurality of first flow channels 221.

[0058] Specifically, at least the first edge 2231 is disposed between the multiple first channels 221 at a position opposite to the air inlet 211 along the axis of the first channel 221.

[0059] It can be understood that the first edge 2231 is a virtual edge, which is the edge that fits the ports connecting each first flow channel 221 and the air inlet space 223 onto a line.

[0060] In this embodiment, the above-described arrangement improves the consistency of the spacing between each first flow channel 221 and the air inlet 211, ensuring that the airflow entering the air intake space 223 from the air inlet 211 travels along similar or equal-length paths before entering the corresponding first flow channel 221. This enhances the uniformity of the airflow entering each first flow channel 221, thereby improving the uniformity of the airflow entering the battery pack 1000 from the corresponding exhaust port group 23 within each first channel.

[0061] Please see Figure 3 In some embodiments, the first edge 2231 is an arc-shaped structure protruding towards the first flow channel 221. This creates a "duffel"-like structure on the side of the air intake space 223 near the first flow channel 221, which reduces turbulence caused by sharp turns or abrupt changes in cross-section. This allows the airflow in the air intake space 223 near the first edge 2231 to flow smoothly along an arc to the inlet of the adjacent first flow channel 221 after being blocked by the partition between the first flow channels 221. This improves the smoothness of the airflow entering each first flow channel 221 and helps to balance the inlet velocity of each first flow channel 221.

[0062] Please see Figure 3 In some embodiments, on a projection plane parallel to the bearing surface 212, the projection of the center point of the air inlet 211 lies within the projection of the symmetry line of the first edge 2231. This improves the consistency of the spacing between each first flow channel 221 and the air inlet 211, ensuring that the airflow entering the air intake space 223 through the air inlet 211 travels along similar or equal-length paths before entering the corresponding first flow channel 221.

[0063] Please see Figure 2 In some embodiments, the air duct 22 further includes a detour space 224 and a plurality of second flow channels 222. Along a first direction, the plurality of second flow channels 222 are arranged side-by-side on one side of the plurality of first flow channels 221. The detour space 224 is located at the end of the first flow channel 221 away from the air inlet space 223. The end of the first flow channel 221 away from the air inlet space 223 is connected to the end of the second flow channel 222 away from the air inlet space 223 via the detour space 224. Part of the exhaust port group 23 is connected to the first flow channel 221, and part of the exhaust port group 23 is connected to the second flow channels 222.

[0064] It is understood that, in managing the temperature of the battery pack 1000, airflow is introduced into the air intake space 223 through the air inlet 211, and then the airflow is introduced into each of the first flow channels 221 through the air intake space 223. A portion of the airflow entering the first flow channel 221 flows into the vicinity of the battery module 300 through a portion of the exhaust port group 23, making direct or indirect contact with the battery cell 301. Another portion of the airflow entering the first flow channel 221 enters the second flow channel 222 through the detour space 224. The airflow entering the second flow channel 222 enters the vicinity of the battery module 300 through a portion of the exhaust port group 23, making direct or indirect contact with the battery cell 301. Then, the airflow is discharged through the air outlet. In this way, the heat of the battery cell 301 is carried away, achieving temperature management of the battery cell 301.

[0065] It is understandable that, in order to improve the uniformity of airflow within each first flow channel 221, the number of first flow channels 221 needs to be controlled without increasing the number of air inlets 211, so that the difference in spacing between the air inlet end of each first flow channel 221 and the air inlet 211 is small. When the area of ​​the bearing surface 212 of the heat management plate 20 (i.e., the plate area of ​​the heat management plate 20) is large, a longer air duct 22 needs to be configured without increasing the number of first flow channels 221, so that the air duct 22 can cover each battery cell 301.

[0066] Based on this, in this embodiment, by controlling the number of first flow channels 221 to ensure good airflow uniformity in each first flow channel 221, the length of the air duct 22 on the airflow trajectory can be increased by setting a detour space 224 and a second flow channel 222, so that the air duct 22 can cover the bearing surface 212 of the heat management plate 20, thereby allowing the surface of the heat management plate 20 facing the battery cell 301 to uniformly discharge air, thereby improving the heat exchange uniformity of the battery cell 301.

[0067] Meanwhile, by setting up a detour space 224, the structure of the flow channels can be simplified, and the airflow of the first flow channel 221 can be gathered in the detour space 224 before entering the second flow channel 222, thereby making the airflow entering the second flow channel 222 more uniform. This can improve the uniformity of the airflow in each second channel entering the battery pack 1000 from the corresponding exhaust hole group 23.

[0068] In addition, the airflow speed is relatively high when it flows to the first flow channel 221 away from the air inlet space 223. Therefore, when the airflow is detoured to the second flow channel 222, it is necessary to set up a detour space 224 for buffering so that the airflow entering the second flow channel 222 is more uniform.

[0069] Please see Figure 4 , Figure 4 yes Figure 2An enlarged structural diagram of part B. In some embodiments, the meandering space 224 has a second edge 2241 adjacent to the first flow channel 221 and the second flow channel 222. At least the middle portion of the second edge 2241 protrudes between the plurality of first flow channels 221 and the plurality of second flow channels 222.

[0070] It can be understood that the second edge 2241 is a virtual edge, which is the edge that fits the ports connecting each first flow channel 221 and each second flow channel 222 to the detour space 224 onto a line.

[0071] It is understandable that the distance between the first flow channel 221 and the second flow channel 222, which are opposite to the end of the second edge 2241, is relatively large, while the distance between the first flow channel 221 and the second flow channel 222, which are opposite to the middle of the second edge 2241, is relatively small. Furthermore, the airflow exiting the first flow channel 221, which is closer to the second flow channel 222, has a higher velocity when it directly reverses direction to the second flow channel 222 (i.e., the closer the airflow is to the two sides, the faster the wind speed). Therefore, the first flow channel 221, which is closer to the second flow channel 222, needs more space to buffer the airflow, allowing it to meander and flow smoothly into the second flow channel 222.

[0072] Based on this, at least the middle part of the second edge 2241 is protruded between the multiple first flow channels 221 and the multiple second flow channels 222, so that the middle part of the detour space 224 has a large size in the length direction of the first flow channel 221, thereby allowing the first flow channel 221 near the second flow channel 222 to have a large buffer space in its own length direction, which is conducive to improving the smoothness of airflow in the first flow channel 221 near the second flow channel 222 into the second flow channel 222, thereby improving the uniformity of air intake in each second flow channel 222.

[0073] Please see Figure 4 In some embodiments, the second edge 2241 is an arc-shaped structure protruding into the adjacent portion between the first flow channel 221 and the second flow channel 222.

[0074] It is understandable that the airflow reversal path in the first flow channel 221, which is closer to the second flow channel 222, is shorter and requires more space for detours, while the airflow reversal path in the first flow channel 221, which is farther from the second flow channel 222, is longer and does not require as much space for detours. Therefore, the length of the detour space 224 in the length direction of the first flow channel 221 varies, that is, the length increases as it approaches the adjacent part between the first flow channel 221 and the second flow channel 222. By setting the second edge 2241 as this arc-shaped structure, the length of the detour space 224 in the length direction of the first flow channel 221 changes more gradually, which helps to improve the stress state of the heat management plate 20 and avoid stress concentration.

[0075] Please see Figure 4 In some embodiments, the ends of the plurality of first flow channels 221 that connect to the detour space 224 are mirror images of the ends of the plurality of second flow channels 222 that connect to the detour space 224. This can help improve the structural symmetry of the plate 21, thereby improving the stress state of the thermal management plate 20 and enhancing its reliability.

[0076] Please see Figure 2 In some embodiments, there are two air ducts 22 and two air inlets 211. Each of the two air ducts 22 is connected to one air inlet 211. The two air ducts 22 are mirror images of each other, and the two air inlets 211 are mirror images of each other. The second flow channels 222 of the two air ducts 22 are arranged close to each other. Thus, air can be supplied to the exhaust port group 23 through multiple air ducts 22, thereby improving the uniformity of airflow from the exhaust port group 23 and thus improving the temperature uniformity of the battery cell 301.

[0077] Specifically, the two air ducts 22 are symmetrically arranged along the center line of the plate 21 parallel to its own length direction, and the two air inlets 211 are symmetrically arranged along the center line of the plate 21 parallel to its own length direction.

[0078] Please see Figure 2 and Figure 5 , Figure 5 yes Figure 2 An enlarged structural diagram of section C is shown. In some embodiments, each air duct 22 further includes a subspace 2252. The subspace 2252 is located at the end of the second flow channel 222 away from the detour space 224. The subspaces 2252 of the two air ducts 22 are interconnected to form a connecting space 225. The second flow channel 222 of each air duct 22 is connected to the subspace 2252.

[0079] It is understandable that due to processing and assembly errors, the dimensions of the two air ducts 22, the dimensions of the exhaust hole group 23 connected to the two air ducts 22, and the dimensions of the air inlet 211 may differ, resulting in differences in the pressure drop of the airflow entering the two air ducts 22.

[0080] Based on this, in this embodiment, the two air ducts 22 are connected by setting a subspace 2252, thereby forming a parallel loop between the two air ducts 22. In this way, the airflow in the air duct with higher pressure can compensate for the airflow in the air duct with lower pressure, thereby balancing the pressure in the two air ducts 22 and improving the uniformity of the airflow from each exhaust hole of the exhaust hole group 23, which is beneficial to improving the uniformity of heat exchange of the battery cell 301.

[0081] Please see Figure 5In some embodiments, the connecting space 225 has a third edge 2251 near the second flow channel 222 of the two air ducts 22, and at least the middle part of the third edge 2251 protrudes between the second flow channels 222 of the two air ducts 22.

[0082] It can be understood that the third edge 2251 is a virtual edge, which is the edge that fits the ports connecting each second channel 222 and the connecting space 225 onto a line.

[0083] It is understandable that the distance between the second flow channel 222 of one air duct 22 opposite to the end of the third edge 2251 and the second flow channel 222 of another air duct 22 is relatively large, while the distance between the second flow channel 222 of one air duct 22 opposite to the middle of the third edge 2251 and the second flow channel 222 of another air duct 22 is relatively small. The airflow discharged from the second flow channel 222 of one air duct 22 near the middle of the third edge 2251 directly changes direction to the second flow channel 222 of another air duct 22 at a higher speed (i.e., the closer the airflow is to the two sides, the faster the wind speed). Therefore, the second flow channel 222 near the middle of the third edge 2251 needs more space to buffer the airflow, allowing it to meander and smoothly flow into the second flow channel 222 of the other air duct 22.

[0084] Based on this, at least the middle part of the third edge 2251 is protruded between the second flow channels 222 of the two air ducts 22, so that the middle part of the connecting space 225 has a large size in the length direction of the second flow channel 222. This allows the second flow channel 222 of one air duct 22 that is close to the other air duct 22 to have a large buffer space in its own length direction, which helps to improve the smoothness of the airflow in the second flow channel 222 of one air duct 22 into the second flow channel 222 of the other air duct 22, thereby improving the uniformity of the airflow.

[0085] Please see Figure 5 In some embodiments, the third edge 2251 is an arc-shaped structure protruding into the adjacent portion between the two air ducts 22.

[0086] It is understandable that the airflow reversal path in the second flow channel 222 of one air duct 22, which is closer to the other air duct 22, is shorter, requiring more space for detours. Conversely, the airflow reversal path in the second flow channel 222 of one air duct 22, which is farther from the other air duct 22, is longer, thus requiring less space for detours. Therefore, the length dimension of the connecting space 225 in the length direction of the second flow channel 222 varies, that is, the length dimension increases as the second flow channel 222 is closer to the adjacent parts of the two air ducts 22. By setting the third edge 2251 as this arc-shaped structure, the change in the length dimension of the connecting space 225 in the length direction of the second flow channel 222 can be made more gradual, thereby improving the stress state of the heat management plate 20 and avoiding stress concentration.

[0087] Please see Figure 1 and Figure 6 , Figure 6 yes Figure 1 An enlarged structural diagram of part D is shown. In some embodiments, the exhaust port group 23 includes a plurality of first port groups 231. The plurality of first port groups 231 are spaced apart along the extension direction of the first flow channel 221. Each first port group 231 includes a plurality of first air holes 2311. The plurality of first air holes 2311 of each first port group 231 are spaced apart along a first direction. Wherein, the first air holes 2311 are connected to the air channel 22.

[0088] Specifically, the first vent 2311 is connected to the gap between two adjacent cells 301 in each battery module 300. The first vent 2311 guides the airflow in the air duct 22 between two adjacent cells 301 in each battery module 300.

[0089] It is understood that the first air vent 2311 is connected to the first flow channel 221. And when the second flow channel 222 is provided, a portion of the first air vent 2311 is connected to the first flow channel 221, and another portion of the first air vent 2311 is connected to the second flow channel 222.

[0090] In this embodiment, the above settings can improve the uniformity of airflow into each battery cell 301 by the thermal management plate 20, thereby improving the heat exchange uniformity of the battery cell 301.

[0091] Please see Figure 1 and Figure 6 In some embodiments, the exhaust port group 23 includes a plurality of second port groups 232. The plurality of second port groups 232 are spaced apart along a first direction. Each second port group 232 includes a plurality of second air holes 2321. The plurality of second air holes 2321 of each second port group 232 are spaced apart along the extension direction of the first flow channel 221. The second air holes 2321 are in communication with the first flow channel 221.

[0092] Specifically, the second vent 2321 is connected to the gap between two adjacent battery modules 300. The second vent 2321 guides the airflow in the air duct 22 between the two adjacent battery modules 300.

[0093] It is understood that the second air vent 2321 is connected to the first flow channel 221. And when the second flow channel 222 is provided, a portion of the second air vent 2321 may be connected to the first flow channel 221, while another portion of the second air vent 2321 may be connected to the second flow channel 222.

[0094] In this embodiment, the above-mentioned arrangement allows airflow between two adjacent battery modules 300, thereby increasing the contact area between the battery cell 301 and the airflow, which helps to improve the heat exchange efficiency of the battery cell 301.

[0095] Please see Figure 1 , Figure 2 and Figure 5 In some embodiments, plate 21 includes a first plate 213, a second plate 214, an edge sealing ring 215, and a plurality of first partitions 216. The second plate 214 is parallel to and opposite to the first plate 213. The surface of the second plate 214 facing away from the first plate 213 is the bearing surface 212. The edge sealing ring 215 is disposed between the first plate 213 and the second plate 214 to enclose an inner cavity together with the first plate 213 and the second plate 214. A plurality of first partitions 216 are disposed in the inner cavity to divide a portion of the inner cavity into a plurality of first flow channels 221. Among them, the air inlet 211 is disposed on one of the first plate 213, the second plate 214, and the edge sealing ring 215, and is located at one end of the first partition 216. The portion of the inner cavity located between the first flow channels 221 and the air inlet 211 is the air inlet space 223.

[0096] For example, the air inlet 211 is disposed on the side of the second plate 214 away from the first plate 213 and is located outside the mounting cavity 101.

[0097] Specifically, plate 21 also includes a second partition 217. The second partition 217 is disposed in the inner cavity to divide a portion of the inner cavity into a plurality of second flow channels 222.

[0098] Specifically, the first partition 216 and the second partition 217 are welded or glued to the first plate 213 and the second plate 214.

[0099] Specifically, the edge sealing ring 215 can be a multi-segment structure, with each segment extending along the edge line of the first plate 213. The two end faces of the edge sealing ring 215 are welded or glued to the first plate 213 and the second plate 214, respectively.

[0100] In this embodiment, the above-mentioned configuration makes the plate 21 a composite part, which reduces the difficulty of forming the flow channel and helps to improve the manufacturing efficiency of the plate 21.

[0101] Please see Figure 1 In some embodiments, the thermal management board 20 also includes an air inlet duct 24. One end of the air inlet duct 24 is connected to the board 21. The inner hole of the air inlet duct 24 communicates with the air inlet 211. In this way, the air inlet 211 can be quickly connected to external pipelines through the air inlet duct 24, thereby improving the ease of operation of connecting the thermal management board 20 to other components.

[0102] Please see Figure 7 , Figure 7This is a structural schematic diagram of the enclosure assembly 100 provided in an embodiment of this application. In a second aspect, an embodiment of this application provides an enclosure assembly 100. The enclosure assembly 100 includes a cover 10 and the aforementioned thermal management plate 20. The cover 10 and the thermal management plate 20 overlap to define a mounting cavity 101.

[0103] Specifically, a sealing gasket is provided between the cover 10 and the thermal management plate 20. The sealing gasket extends in a ring around the periphery of the thermal management plate 20. The thermal management plate 20 is connected to the cover 10 by screws, which compresses the sealing gasket, thereby sealing the contact surface between the cover 10 and the thermal management plate 20.

[0104] It is understood that the housing assembly 100 includes the aforementioned thermal management plate 20, and the housing assembly 100 has all the beneficial effects of the thermal management plate 20, which will not be described again in this embodiment.

[0105] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a battery pack 1000 provided in an embodiment of this application. In a third aspect, an embodiment of this application provides a battery pack 1000. The battery pack 1000 includes a battery module 300 and the aforementioned housing assembly 100. The battery module 300 is disposed in the mounting cavity 101.

[0106] It is understood that the battery module 300 includes multiple battery cells 301 and a connection row 302 that electrically connects the multiple battery cells 301.

[0107] It is understood that the battery pack 1000 includes the aforementioned housing assembly 100, and the battery pack 1000 has all the beneficial effects of the housing assembly 100, which will not be repeated in this embodiment.

[0108] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A thermal management plate (20) characterized by, Includes a plate (21), the plate (21) having a bearing surface (212), an air inlet (211), an air duct (22) and an exhaust hole group (23), the air inlet (211) being disposed on the outer surface of the plate (21), the exhaust hole group (23) being disposed on the bearing surface (212), and the air duct (22) being disposed inside the plate (21); The air duct (22) includes an air inlet space (223) and a plurality of first flow channels (221). The air inlet (211) is connected to the plurality of first flow channels (221) through the air inlet space (223). The plurality of first flow channels (221) are arranged sequentially along a first direction. The first direction is perpendicular to the extension direction of the first flow channel (221) and parallel to the bearing surface (212). The exhaust hole group (23) is connected to the first flow channel (221).

2. The thermal management panel (20) of claim 1, wherein, The air intake space (223) has a first edge (2231) near the first flow channel (221), and at least the middle part of the first edge (2231) protrudes between the plurality of first flow channels (221).

3. The thermal management panel (20) of claim 2, wherein, The first edge (2231) is an arc-shaped structure protruding toward the first flow channel (221).

4. The thermal management panel (20) of claim 3, wherein, On the projection plane parallel to the bearing surface (212), the projection of the center point of the air inlet (211) lies in the projection of the symmetry line of the first edge (2231).

5. The thermal management plate (20) according to any one of claims 1-4, characterized in that, The air duct (22) further includes a detour space (224) and a plurality of second flow channels (222). Along the first direction, the plurality of second flow channels (222) are arranged side by side on one side of the plurality of first flow channels (221). The detour space (224) is located at the end of the first flow channel (221) away from the air inlet space (223). The end of the first flow channel (221) away from the air inlet space (223) is connected to the end of the second flow channel (222) away from the air inlet space (223) through the detour space (224). Part of the exhaust hole group (23) is connected to the first flow channel (221), and part of the exhaust hole group (23) is connected to the second flow channel (222).

6. The thermal management panel (20) of claim 5, wherein, The meandering space (224) has a second edge (2241) near the first flow channel (221) and the second flow channel (222), and at least the middle part of the second edge (2241) protrudes between the plurality of first flow channels (221) and the plurality of second flow channels (222).

7. The thermal management panel (20) of claim 6, wherein, The second edge (2241) is an arc-shaped structure protruding into the adjacent part between the first flow channel (221) and the second flow channel (222).

8. The thermal management panel (20) of claim 7, wherein, One end of the plurality of first channels (221) connected to the detour space (224) is a mirror image of the other end of the plurality of second channels (222) connected to the detour space (224).

9. The thermal management panel (20) of claim 5, wherein, There are two air ducts (22) and two air inlets (211). The two air ducts (22) are connected to one air inlet (211) respectively. The two air ducts (22) are mirror images of each other, and the two air inlets (211) are mirror images of each other. The second flow channels (222) of the two air ducts (22) are arranged close to each other.

10. The thermal management panel (20) of claim 9, characterized in that, Each of the air ducts (22) further includes a subspace (2252), which is located at the end of the second flow channel (222) away from the detour space (224). The subspaces (2252) of the two air ducts (22) are interconnected to form a connecting space (225). The second flow channel (222) of each air duct (22) is connected to the subspace (2252).

11. The thermal management panel (20) of claim 10, wherein, The connecting space (225) has a third edge (2251) near the second flow channel (222) of the two air ducts (22), at least the middle part of the third edge (2251) protrudes between the second flow channels (222) of the two air ducts (22).

12. The thermal management panel (20) of claim 11, characterized in that, The third edge (2251) is an arc-shaped structure protruding into the adjacent part between the two air ducts (22).

13. The thermal management panel (20) according to any one of claims 1-4, characterized by, The exhaust hole group (23) includes a plurality of first hole groups (231), which are spaced apart along the extension direction of the first flow channel (221). Each first hole group (231) includes a plurality of first air holes (2311), which are spaced apart along the first direction. The first air hole (2311) is connected to the air duct (22).

14. The thermal management panel (20) according to any one of claims 1-4, characterized by, The exhaust hole group (23) includes a plurality of second hole groups (232), which are spaced apart along the first direction; Each second hole group (232) includes a plurality of second air holes (2321), and the plurality of second air holes (2321) in each second hole group (232) are spaced apart along the extension direction of the first flow channel (221); The second air hole (2321) is connected to the air duct (22).

15. The thermal management panel (20) according to any one of claims 1-4, characterized by, The plate (21) includes: First board (213); The second plate (214) is parallel to and opposite to the first plate (213), and the surface of the second plate (214) facing away from the first plate (213) is the bearing surface (212); A sealing ring (215) is disposed between the first plate (213) and the second plate (214) to enclose the inner cavity together with the first plate (213) and the second plate (214); A plurality of first baffles (216) are disposed in the inner cavity to divide a portion of the inner cavity into the plurality of first flow channels (221); The air inlet (211) is disposed on one of the first plate (213), the second plate (214) and the sealing ring (215), and is located at one end of the first partition (216). The part of the inner cavity located between the first flow channel (221) and the air inlet (211) is the air intake space (223).

16. The thermal management panel (20) according to any one of claims 1-4, characterized by, The thermal management plate (20) also includes an air inlet pipe (24), one end of which is connected to the plate (21), and the inner hole of the air inlet pipe (24) is connected to the air inlet (211).

17. A box assembly (100) characterized by, Comprising: a box cover (10); and a thermal management plate (20) according to any one of claims 1-16; wherein the box cover (10) and the thermal management plate (20) are mutually covered to define a mounting cavity (101). Comprising:

18. A battery pack (1000), characterized by, the box assembly (100) according to claim 17; and a battery module (300) disposed in the mounting cavity (101). ​

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