Box assembly and battery pack

Abstract

This application provides a housing assembly and a battery pack. The housing assembly includes a first plate and a second plate that overlap each other to define a mounting cavity. The first plate has an air inlet, an air concentrator, and an air outlet. The second plate has an air inlet, an air duct, and an exhaust port assembly. The air duct includes an air inlet space and multiple first flow channels. The air inlet, air inlet space, first flow channels, exhaust port assembly, mounting cavity, air inlet, air concentrator, and air outlet are sequentially connected. By employing the above solution, airflow from the air inlet first enters the air inlet space, and then the airflow is synchronously guided to each of the first flow channels, improving the uniformity of airflow entering each of the first flow channels. Simultaneously, the airflow in the mounting cavity first converges in the air concentrator through the air inlet before being discharged from the air outlet, thereby extending the flow path of the airflow around the cells near the air outlet within the battery pack, promoting more thorough airflow through each cell. This improves the uniformity of heat exchange among the cells.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to 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 battery cells. Specifically, air inlets and outlets are provided on the housing assembly. Airflow is delivered into the mounting cavity through the air inlet, allowing the airflow to contact the battery cells for heat exchange, thereby heating or cooling the cells to achieve temperature management. Then, the airflow in the mounting cavity is discharged through the air outlet. However, in this temperature management method, the airflow entering the mounting cavity from the air inlet is uneven around each battery cell, and the airflow velocity exiting from the air outlet varies significantly in different parts of the mounting cavity. This leads to large differences in heat exchange efficiency among some battery cells, resulting in uneven heat exchange and large temperature differences between cells. Consequently, the consistency of battery cell performance is poor, which adversely affects the reliability of the battery pack. Utility Model Content

[0004] The embodiments of this application provide a housing assembly and a battery pack, which can improve the heat exchange uniformity of the cells, thereby improving the consistency of cell performance and thus enhancing the reliability of the battery pack.

[0005] In a first aspect, embodiments of this application provide a housing assembly comprising a first plate and a second plate. The first plate has a sequentially connected air inlet, an air concentrator, and an air outlet. The second plate overlaps the first plate to define a mounting cavity. The second plate has a sequentially connected air inlet, air duct, and exhaust port group. The air duct is disposed within the second plate and includes an air inlet space and a plurality of first flow channels. One end of the air inlet is connected to one end of the plurality of first flow channels through the air inlet space, and the plurality of first flow channels are connected to the mounting cavity through the exhaust port group. The mounting cavity is connected to the end of the air inlet away from the air concentrator. The plurality of first flow channels are sequentially arranged along a first direction, which is perpendicular to the extension direction of the first flow channel and parallel to the surface of the second plate facing the first plate. This improves the heat exchange uniformity of the battery cells, reduces the temperature difference between the cells, and thus improves the consistency of cell performance, thereby enhancing 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, allowing airflow entering the air intake space from the air inlet to travel 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, the second plate has a bearing surface facing the air-gathering cavity, and in a projection plane parallel to the bearing surface, the projection of the center point of the air inlet lies in 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, allowing the airflow entering the air intake space through the air inlet to pass through paths of similar or equal length before entering the corresponding first flow channel.

[0009] In some embodiments, the air duct further includes a detour 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 detour 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 detour 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 for each first flow channel, by setting up the detour 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 surface of the second plate, thereby allowing uniform airflow from the surface of the second plate facing the battery cell, 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. This results in the middle portion of the meandering space having a larger dimension along the length of the first flow channels, thereby 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 into the adjacent portion between the first and second flow channels. This allows the variation in length of the meandering space along the length of the first flow channel to be relatively gentle, thereby improving the stress state of the second plate and preventing stress concentration.

[0012] In some embodiments, the ends of the plurality of first flow channels communicating with the detour space and the ends of the plurality of second flow channels communicating with the detour space are mirror images of each other. This can help improve the structural symmetry of the second plate, thereby improving the stress state of the second 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 dimension of the connecting space along the length of the second flow channel, thereby improving the stress state of the second plate and preventing stress concentration.

[0017] In some embodiments, the second plate has a bearing surface facing the air-gathering cavity, and an exhaust hole group is disposed on the bearing surface. The exhaust hole group includes a plurality of first hole groups, which are spaced apart along the extension direction of the first flow channel. Each first hole group includes a plurality of first air holes, which are spaced apart along a first direction, laterally perpendicular to the extension direction of the first flow channel and parallel to the bearing surface; wherein the first air holes communicate with the first flow channel; and / or, the exhaust hole group includes a plurality of second hole groups, which are spaced apart along the first direction. Each second hole 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 communicate with the first flow channel. This improves the uniformity of airflow directed by the second plate into each battery cell, thereby improving the heat exchange uniformity of the battery cells.

[0018] In some embodiments, the second plate includes a first plate, a second plate, and an edge sealing ring; the second plate is parallel to and opposite to the first plate, and an exhaust hole group is provided on the surface of the second plate facing away from the first plate; the edge sealing ring is disposed between the first plate and the second plate to enclose an inner cavity together with the first plate and the second plate; a 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. Thus, the second plate is a composite component, thereby reducing the difficulty of forming the flow channels and improving the manufacturing efficiency of the second plate.

[0019] In some embodiments, there are multiple air supply holes, and the density of the air supply holes increases along the direction away from the air outlet. This results in a larger communication area between the mounting cavity and the air-gathering cavity, which allows the airflow in the battery pack to mainly enter the air-gathering cavity from the side away from the air outlet, and also increases the efficiency of the airflow in the mounting cavity entering the air-gathering cavity, thereby improving heat exchange efficiency.

[0020] In some embodiments, multiple air supply holes are arranged sequentially in a direction away from the air outlet. This makes the air supply structure layout regular, thereby reducing the manufacturing difficulty of the air supply structure.

[0021] In some embodiments, along the direction away from the air outlet, the spacing between any two adjacent air outlets in the plurality of air outlets tends to decrease. This allows the density of the air outlets to increase along the direction away from the air outlet, while also simplifying the arrangement of the air outlet density variations. This results in a simpler structure for the first plate, making it easier to manufacture and improving manufacturing efficiency.

[0022] In some embodiments, the air supply holes are strip-shaped holes, with the major axis of the air supply holes perpendicular to the arrangement direction of the air supply holes. This allows the space between two adjacent air supply holes to form a rib-like connection, thereby ensuring the structural strength of the first plate while maintaining a large area of ​​air supply holes.

[0023] In some embodiments, the distance between the adjacent walls of two air outlets is D1, and the width of the air outlets in the arrangement direction is R, satisfying: 0.5R≤D1. This helps to ensure the size of the gap between two adjacent air outlets, thereby ensuring the structural strength of the rib-like connection formed by the gap between two adjacent air outlets, and thus improving the structural strength of the first plate.

[0024] In some embodiments, the first plate includes a top plate and an inner plate, which are interlocked to define an air-gathering cavity. The inner plate faces the second plate, an air inlet is disposed on the inner plate, and an air outlet is disposed on the top plate. The top plate is connected to the second plate, and the inner plate, the second plate, and the portion of the top plate located between the inner and second plates together define a mounting cavity. This arrangement, with the top plate and inner plate forming the first plate, reduces the manufacturing difficulty of the first plate and improves its manufacturing efficiency.

[0025] In some embodiments, the top plate has a groove, and an inner plate is disposed within the groove. The periphery of the inner plate is connected to the first groove sidewall of the groove to define an air-gathering cavity between the inner plate and the first groove bottom wall of the groove. An air outlet is disposed on the first groove sidewall and located between the first groove bottom wall and the inner plate. Thus, the inner plate can be quickly positioned by contacting the first groove sidewall with the inner plate, thereby improving the assembly efficiency between the top plate and the inner plate and facilitating the improvement of the manufacturing efficiency of the first plate component.

[0026] In some embodiments, the inner panel includes a main body and multiple flanges. Each flange is connected to multiple edges of the main body and corresponds one-to-one with a plurality of first groove sidewalls of the groove. Each flange is abutted and connected to its corresponding first groove sidewall. The main body faces the second panel, and air vents are located on the main body. This increases the contact area between the inner panel and the top panel, thereby improving the reliability of the connection between them and thus enhancing the reliability of the first panel.

[0027] In some embodiments, both the top plate and the inner plate are sheet metal parts. This improves material utilization, reduces waste, and lowers manufacturing and maintenance costs.

[0028] In some embodiments, the total ventilation area of ​​the exhaust vent group is S1, and the total ventilation area of ​​the supply vents is S2, satisfying that S2 > S1. This ensures that the total ventilation area of ​​the supply vents is greater than the total ventilation area of ​​the exhaust vent group, thereby preventing positive pressure from forming in the mounting cavity and allowing airflow to exit the mounting cavity more smoothly, thus improving the air intake efficiency of the mounting cavity.

[0029] In some embodiments, the housing assembly further includes an air inlet duct, one end of which is connected to the second plate, and the inner hole of the air inlet duct communicates with the air inlet; and / or, the housing assembly further includes an air outlet duct, one end of which communicates with the end of the air outlet away from the air gathering chamber. Thus, the air inlet can be quickly connected to an external pipeline via the air inlet duct, thereby improving the ease of connection between the second plate and other components. Simultaneously, the air outlet can be quickly connected to an external pipeline via the air outlet duct, thereby improving the ease of connection between the first plate and other components.

[0030] Secondly, embodiments of this application provide a battery pack including a battery module and the aforementioned housing assembly; the battery module is disposed in the mounting cavity and contacts the second plate. This improves the uniformity of heat exchange between the battery cells, reduces the temperature difference between the cells, and thus improves the consistency of cell performance, thereby enhancing the reliability of the battery pack.

[0031] In some embodiments, the battery module includes clamping plates, battery cells, connecting bars, module end plates, and binding straps; there are multiple clamping plates and multiple battery cells; multiple battery cells and multiple clamping plates are arranged alternately in a direction perpendicular to the clamping plates to form a battery cell row, with each clamping plate having one battery cell attached to each of its two sides; the connecting bars electrically connect the multiple battery cells; two module end plates are respectively disposed at both ends of the battery cell row; binding straps are sleeved on the module end plates and the battery cell row to bind the module end plates and the battery cell row together. Thus, when the battery cells expand due to heat, the clamping plates can offset part of the expansion force of the battery cells, thereby effectively suppressing the expansion of the battery cells and ensuring the reliability of the electrical connection between the battery cells.

[0032] In some embodiments, the clamping plate has two opposing contact surfaces and two opposing first end faces. The contact surfaces are in contact with adjacent battery cells, and the two first end faces are located between the two contact surfaces and are connected to both contact surfaces. The first end faces and contact surfaces are interconnected to define a connection edge. A plurality of first through holes are provided on the clamping plate, spaced apart along the length of the connection edge and penetrating the two first end faces. One end of each of the first through holes communicates with an exhaust port group, and the other end faces the air collection chamber. Thus, airflow can be introduced into the clamping plate through the first through holes, allowing heat exchange between the airflow and the clamping plate to manage the battery cell temperature. This improves the heat exchange efficiency of the battery cells, thereby enhancing the reliability of the clamping plate.

[0033] In some embodiments, the clamping plate is further provided with multiple through-hole groups, which are spaced apart along the length of the connecting edge and correspond one-to-one with multiple first through holes. Each through-hole group includes multiple second through holes spaced apart along the axis of the first through holes. Each second through hole in each through-hole group penetrates two contact surfaces and the corresponding first through hole. In this way, airflow can be introduced into the clamping plate through the first through holes for heat exchange and cell temperature management, and airflow can also be directed to the cell surface through the second through holes for direct cell temperature management. This improves the heat exchange efficiency of the cell, thereby enhancing the reliability of the clamping plate.

[0034] In some embodiments, a plurality of buffer grooves are provided on the contact surface, and each buffer groove corresponds one-to-one with a plurality of through-hole groups, with the through-hole groups disposed on the bottom wall of the corresponding buffer groove. In this way, the buffer grooves provide buffer space for the fluid output from the second through-hole, allowing more airflow to flow into the buffer grooves, thereby enabling the airflow to make more thorough contact with the battery cell and exchange heat. This improves the heat exchange efficiency of the battery cell.

[0035] In some embodiments, the depth of the buffer groove is Da, satisfying: 0.5mm ≤ Da ≤ 0.8mm; and / or, the buffer groove is a through groove extending along the axis of the first through hole. This ensures, on the one hand, that the buffer groove has sufficient depth to provide adequate buffer space for airflow from the second through hole; on the other hand, it avoids the buffer groove depth Db being too large, which could affect the structural strength of the clamping plate, thus ensuring the reliability of the clamping plate. Furthermore, it facilitates the discharge of airflow entering the buffer groove through the end of the buffer groove, thereby increasing the cross-sectional area of ​​the channel for airflow in the clamping plate, which in turn increases the airflow velocity and thus improves the heat exchange efficiency of the battery cell.

[0036] In some embodiments, the inner wall of the buffer groove includes a second groove bottom wall and a second groove side wall connected together, with the second groove bottom wall transitioning to the second groove side wall by an arc. This improves the stress state at the connection between the second groove bottom wall and the second groove side wall, avoiding stress concentration.

[0037] In some embodiments, the bottom wall of the second groove transitions to the side wall of the second groove in an arc to form a rounded corner surface, the radius of which is 0.4π to 0.6π. This allows the bottom wall of the second groove to transition to the side wall of the second groove more smoothly, thereby reducing stress concentration.

[0038] In some embodiments, the inner wall of the buffer groove includes a second groove bottom wall and a second groove side wall connected together, with one end of the second groove side wall away from the second groove bottom wall rounded off to the adjacent contact surface. This improves the stress state at the connection between the groove side wall and the contact surface, avoiding stress concentration.

[0039] In some embodiments, in each group of through holes, the distance between the adjacent walls of two adjacent second through holes is Db, satisfying: 0.8mm ≤ Db ≤ 2mm. This ensures, on the one hand, that the portion of the clamping plate located between two adjacent second through holes has sufficient dimensions to guarantee the structural strength of that portion, thereby improving the reliability of the clamping plate; on the other hand, it allows for control of the distance Db between the adjacent walls of two second through holes, enabling the clamping plate to accommodate more second through holes, thus facilitating a larger contact area between the airflow and the battery cell, thereby improving the heat exchange efficiency of the battery cell.

[0040] In some embodiments, the second through hole is an oval hole, and the direction of the major axis of the second through hole is parallel to the length direction of the connecting edge. In this way, the second through hole can have a larger cross-sectional area, which is beneficial to improving airflow efficiency. At the same time, it can also reduce the number of inflection points of the second through hole, which helps to avoid stress concentration and improve the stress state of the clamping plate.

[0041] In some embodiments, the clamping plate is further provided with a plurality of third through holes, each of which penetrates both first end faces. The plurality of third through holes and the plurality of first through holes are staggered along the length of the connecting edge. This increases the flow rate of airflow from the bottom of the battery cell into the clamping plate and the flow rate of airflow within the clamping plate directed to the top of the battery cell, thereby improving heat exchange efficiency.

[0042] In some embodiments, the clamping plate is provided with multiple connecting ribs, each corresponding to a plurality of third through holes. Each connecting rib is disposed within the corresponding third through hole and connected to a portion of the hole wall. In this way, the channel area for airflow in the clamping plate can be increased while ensuring the structural strength of the clamping plate, enabling it to effectively suppress the expansion of the battery cell.

[0043] In some embodiments, the connecting ribs divide the third through hole into multiple sub-through holes, the axes of which are parallel to the axis of the first through hole. This increases the channel area for airflow in the clamping plate and reduces turbulence within the third through hole, thereby improving airflow smoothness within the third through hole.

[0044] In some embodiments, along the length of the connecting edge, each first through hole is connected to an adjacent sub-through hole on both sides. This increases the channel area for airflow in the clamping plate, thereby increasing the airflow through the clamping plate and improving the heat exchange efficiency of the battery cell.

[0045] In some embodiments, two connecting ribs are provided in the third through hole located in the middle of the clamping plate, and the two connecting ribs are arranged sequentially along the length of the connecting edge. In this way, the structural strength of the middle part of the clamping plate can be enhanced, thereby improving the structural strength of the clamping plate and enabling it to effectively suppress the expansion of the battery cell.

[0046] In some embodiments, the connecting rib has a cross structure, with two ends connected to the wall of the third through hole near one contact surface, and the other two ends connected to the wall of the third through hole near the other contact surface. This design simplifies the connecting rib structure while providing strong structural strength, thereby enhancing the structural strength of the clamping plate.

[0047] In some embodiments, the clamping plate is made of plastic. This allows the clamping plate to have a certain degree of elasticity, so that when the battery cell expands due to heat, the deformation recovery force of the clamping plate can offset part of the expansion force of the battery cell, thereby effectively suppressing the expansion of the battery cell. At the same time, it can control the material cost and weight of the clamping plate, so as to facilitate the lightweighting of the clamping plate.

[0048] The beneficial effects of the embodiments of this application are as follows:

[0049] In the embodiments of this application, the above-described scheme allows airflow from the air inlet to first enter the air inlet space, and then the airflow is synchronously guided to each of the first flow channels through the air inlet space. This improves the uniformity of the air inlet pressure of each of the first flow channels, thereby improving the uniformity of the airflow entering each of the first flow channels. Furthermore, it improves the uniformity of the airflow entering the mounting cavity from the corresponding exhaust port group within each of the first channels. Simultaneously, the airflow in the mounting cavity first converges in the air-gathering cavity through the air supply holes before being discharged from the air outlet. This prevents the airflow around the cells near the air outlet from being directly discharged from the air outlet, thus extending the flow path of the airflow around the cells near the air outlet within the battery pack. This allows the airflow to flow more fully through each cell, improving the uniformity of airflow velocity around each cell within the battery pack. This improves the uniformity of heat exchange between the cells, reduces the temperature difference between cells, and thus improves the consistency of cell performance, thereby enhancing the reliability of the battery pack. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a structural schematic diagram of the housing assembly provided in an embodiment of this application;

[0052] Figure 2 This is an exploded structural diagram of the housing assembly provided in an embodiment of this application;

[0053] Figure 3 This is a schematic diagram of the structure of the second plate provided in an embodiment of this application;

[0054] Figure 4This is a schematic diagram of the internal structure of the second plate provided in an embodiment of this application;

[0055] Figure 5 yes Figure 4 A magnified structural diagram of part A in the middle;

[0056] Figure 6 yes Figure 4 A magnified structural diagram of part B in the middle section;

[0057] Figure 7 yes Figure 4 A magnified structural diagram of section C;

[0058] Figure 8 yes Figure 3 A magnified structural diagram of section D;

[0059] Figure 9 This is a schematic diagram of the structure of the first plate provided in an embodiment of this application;

[0060] Figure 10 This is a schematic diagram of the internal structure of the first plate provided in an embodiment of this application;

[0061] Figure 11 This is a side view of the first plate provided in an embodiment of this application;

[0062] Figure 12 yes Figure 11 A cross-sectional view of the EE structure;

[0063] Figure 13 This is provided by the embodiments of this application. Figure 11 Enlarged structural diagram at point F;

[0064] Figure 14 This is a schematic diagram of the inner plate structure provided in an embodiment of this application;

[0065] Figure 15 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0066] Figure 16 This is a schematic diagram of the structure of the battery module provided in an embodiment of this application;

[0067] Figure 17 This is a schematic diagram of the structure of the clamp provided in an embodiment of this application;

[0068] Figure 18 This is a side view of the clamp provided in an embodiment of this application;

[0069] Figure 19 This is a partial structural diagram of the clamp provided in an embodiment of this application.

[0070] Explanation of reference numerals in the attached figures:

[0071] 100 - Enclosure assembly; 101 - Mounting cavity;

[0072] 11-First plate; 111-Air concentrator; 112-Air supply hole; 113-Air outlet; 114-Top plate; 1141-Groove; 1142-Side wall of the first groove; 1143-Bottom wall of the first groove; 115-Inner plate; 1151-Plate body; 1152-Flanged edge; 12-Air outlet pipe; 121-Positioning flange;

[0073] 21-Second plate; 211-Air inlet; 212-Bearing surface; 213-First plate; 214-Second plate; 215-Edge sealing ring; 216-First partition; 217-Second partition;

[0074] 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;

[0075] 23-Exhaust vent group; 231-First vent group; 2311-First air vent; 232-Second vent group; 2321-Second air vent; 24-Air inlet pipe;

[0076] 1000-battery pack;

[0077] 300 - Battery module; 301 - Battery cell; 302 - Connector bar; 303 - Module end plate; 304 - Binding strap;

[0078] 31-Clamping plate; 311-Contact surface; 312-First end face; 313-Connecting edge line; 321-First through hole; 322-Third through hole; 3221-Sub-through hole; 33-Second through hole; 34-Buffer groove; 341-Second groove bottom wall; 342-Second groove side wall; 343-Rounded corner surface;

[0079] 35-Connecting bar. Detailed Implementation

[0080] 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.

[0081] Furthermore, it should be understood that 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, features 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.

[0082] 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.

[0083] 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.

[0084] The following combination Figures 1 to 19 The following is a detailed description of a housing assembly 100 and a battery pack 1000 provided in the embodiments of this application.

[0085] Please see Figures 1 to 14 In a first aspect, embodiments of this application provide a housing assembly 100. For example... Figure 1 and Figure 2 As shown, the housing assembly 100 includes a first plate 11 and a second plate 21. Figure 9 and Figure 10 As shown, the first plate 11 has an air supply hole 112, an air concentrator 111, and an air outlet 113 connected in sequence. The second plate 21 overlaps the first plate 11 to define the mounting cavity 101. Figure 3 and Figure 4 As shown, the second plate 21 has an air inlet 211, an air duct 22, and an exhaust port group 23 connected in sequence. The air duct 22 is disposed within the second plate 21. The air duct 22 includes an air inlet space 223 and a plurality of first flow channels 221. One end of 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 connected to the mounting cavity 101 through the exhaust port group 23. The mounting cavity 101 is connected to the end of the air supply hole 112 away from the air gathering cavity 111. The plurality of first flow channels 221 are arranged sequentially along a first direction, which is perpendicular to the extension direction of the first flow channels 221 and parallel to the surface of the second plate 21 facing the first plate 11.

[0086] It is understood that the air inlet 211, air duct 22, exhaust port group 23, mounting cavity 101, air supply port 112, air concentrator 111, and air outlet 113 are sequentially connected. The air duct 22 is used to transport airflow. The air duct 22, through the exhaust port group 23, delivers dry cold or hot air to the cells 301 of the battery module 300 for heat exchange. The airflow can effectively cover all surfaces of the cells 301, achieving uniform heat exchange, reducing the temperature difference between cells 301, and thus improving the cycle life of the cells 301.

[0087] An air inlet 211 is disposed on the outer surface of the plate 21. Specifically, the air inlet 211 and the exhaust port assembly 23 may be disposed on the same surface. For example, the air inlet 211 is disposed on the side of this surface 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, which facilitates the connection between the air inlet 211 and the air intake pipe.

[0088] 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.

[0089] It is understood that the first flow channel 221 can be a recess directly formed on the first plate 11, or it can be formed by dividing the inner cavity of the first plate 11 through a partition. Specifically, the air channel 22 can be formed by aluminum extrusion process.

[0090] 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.

[0091] It is understood that the first plate 11 can be an assembly, which can be formed by assembling two parts to define the air-gathering cavity 111. The first plate 11 can also be a single piece, for example, the first plate 11 can be molded into a single piece with the air-gathering cavity 111 by injection molding or blow molding.

[0092] For example, the second plate 21 is the base plate of the battery pack 1000, which is used to support and fix the battery module 300. The first plate 11 is the cover of the battery pack 1000.

[0093] Specifically, for temperature management 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. The airflow entering the first flow channel 221 flows into the vicinity of the battery module 300 through the exhaust hole group 23 to directly or indirectly contact the battery cell 301, thereby exchanging heat with the battery cell 301. Next, the airflow located in the mounting cavity 101 enters the air gathering cavity 111 away from the air outlet 113 through the air supply hole 112. Then, the airflow in the air gathering cavity 111 is discharged through the air outlet 113. In this way, the temperature of the battery cell 301 is managed by ventilation, so that the battery cell 301 operates at a suitable temperature.

[0094] In this embodiment, the airflow from the air inlet 211 first enters the air inlet space 223, and then the airflow is synchronously guided to each of the first flow channels 221 through the air inlet space 223. This helps to improve the uniformity of the air inlet pressure of each of the first flow channels 221, thereby improving the uniformity of the airflow entering each of the first flow channels 221. In turn, this improves the uniformity of the airflow entering the mounting cavity 101 from the corresponding exhaust hole group 23 in each of the first channels. At the same time, the airflow in the mounting cavity 101 will first converge in the air gathering cavity 111 through the air supply hole 112 before being discharged from the air outlet 113. This avoids the airflow around the battery cell 301 near the air outlet 113 being directly discharged from the air outlet 113. This extends the flow path of the airflow around the battery cell 301 near the air outlet 113 in the battery pack 1000, allowing the airflow to flow more fully through each battery cell 301, which helps to improve the uniformity of the airflow velocity around each battery cell 301 in the battery pack 1000. This can improve the heat exchange uniformity of cell 301, reduce the temperature difference between cells 301, and thus improve the performance consistency of cells 301, thereby improving the reliability of battery pack 1000.

[0095] Furthermore, since the airflow velocity entering the air duct 22 from the air inlet 211 is high, the airflow cross-section can be increased by setting the air inlet space 223, which buffers the airflow and guides it to enter the duct smoothly. In this way, the airflow can be prevented from directly impacting the wall of the first duct 221, thus reducing wind noise.

[0096] Please see Figure 4 and Figure 5 In some embodiments, the air inlet space 223 has a first edge 2231 near the first flow channel 221. At least the middle portion of the first edge 2231 protrudes between the plurality of first flow channels 221.

[0097] Specifically, at least the first edge 2231 protrudes between the multiple first channels 221 at a portion opposite to the air inlet 211 along the axis of the first channel 221.

[0098] 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.

[0099] 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.

[0100] Please see Figure 5 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.

[0101] Please see Figure 3 and Figure 5 In some embodiments, the second plate 21 has a bearing surface 212 facing the air-gathering cavity 111. In a 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. This improves the consistency of the spacing between each first flow channel 221 and the air inlet 211, so that the airflow entering the air intake space 223 through the air inlet 211 flows through a path of similar or equal length before entering the corresponding first flow channel 221.

[0102] Please see Figure 4 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.

[0103] It is understood that, for temperature management 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 hole group 23 to directly or indirectly contact 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 hole group 23 to directly or indirectly contact the battery cell 301. Then, the airflow located in the mounting cavity 101 is discharged sequentially through the air supply hole 112, the air collection cavity 111, and the air outlet 113. In this way, temperature management of the battery cell 301 is achieved.

[0104] 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 surface area of ​​the second plate 21 (i.e., the area of ​​the second plate 21 that carries the battery module 300) 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 cell 301.

[0105] 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 in 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 surface of the second plate 21, thereby allowing the surface of the second plate 21 facing the cell 301 to uniformly discharge air, thereby improving the heat exchange uniformity of the cell 301.

[0106] 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.

[0107] 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.

[0108] Please see Figure 4 and Figure 6In 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] Please see Figure 4 and Figure 6 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.

[0113] 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 change in the length of the detour space 224 in the length direction of the first flow channel 221 can be made more gradual, which can help improve the stress state of the second plate 21 and avoid stress concentration.

[0114] Please see Figure 4 and Figure 6 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 second plate 21, thereby improving the stress state of the second plate 21 and enhancing its reliability.

[0115] Please see Figure 4 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.

[0116] Specifically, the two air ducts 22 are symmetrically arranged along the center line of the second plate 21 parallel to its own length direction, and the two air inlets 211 are symmetrically arranged along the center line of the second plate 21 parallel to its own length direction.

[0117] Please see Figure 4 and Figure 7 In some embodiments, each air duct 22 further includes a subspace 2252. The subspace 2252 is located at the end of the second air duct 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 air duct 222 of each air duct 22 is connected to the subspace 2252.

[0118] 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.

[0119] 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.

[0120] Please see Figure 7 In 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] Please see Figure 7 In some embodiments, the third edge 2251 is an arc-shaped structure protruding into the adjacent portion between the two air ducts 22.

[0125] It is understandable that the airflow reversal path within 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 within 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, it increases as the second flow channel 222 nears 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 becomes more gradual, thereby improving the stress state of the second plate 21 and avoiding stress concentration.

[0126] Please see Figure 3 and Figure 8In some embodiments, the second plate 21 has a bearing surface 212 facing the air-gathering cavity 111. An exhaust port group 23 is disposed on the bearing surface 212. The exhaust port group 23 includes a plurality of first hole groups 231. The plurality of first hole groups 231 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. The plurality of first air holes 2311 of each first hole group 231 are spaced apart along a first direction. The first air holes 2311 communicate with the air duct 22.

[0127] 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.

[0128] 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.

[0129] In this embodiment, the above-mentioned settings can improve the uniformity of airflow being directed into each battery cell 301 by the second plate 21, thereby improving the heat exchange uniformity of the battery cell 301.

[0130] Please see Figure 3 and Figure 8 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 connected to the air duct 22.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] Please see Figure 3 , Figure 4 and Figure 7 In some embodiments, the second plate 21 includes a first plate 213, a second plate 214, and a sealing ring 215. The second plate 214 is parallel to and opposite to the first plate 213. An exhaust hole group 23 is provided on the surface of the second plate 214 facing away from the first plate 213. The sealing ring 215 is disposed between the first plate 213 and the second plate 214 to jointly enclose an inner cavity. Multiple first partitions 216 are disposed in the inner cavity to divide a portion of the inner cavity into multiple first flow channels 221. An 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 a 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.

[0135] 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.

[0136] Specifically, the second 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.

[0137] Specifically, the first partition 216 and the second partition 217 are welded or glued to the first plate 213 and the second plate 214.

[0138] 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.

[0139] In this embodiment, the above-mentioned configuration makes the second plate 21 a composite part, thereby reducing the difficulty of forming the flow channel and improving the manufacturing efficiency of the second plate 21.

[0140] Please see Figures 9 to 11 In some embodiments, there are multiple air supply holes 112. The density of the air supply holes 112 increases along the direction away from the air outlet 113. This results in a larger communication area between the mounting cavity 101 and the air concentrator 111, thereby enabling the airflow in the battery pack 1000 to mainly enter the air concentrator 111 from the side away from the air outlet 113, and also increasing the efficiency of the airflow in the mounting cavity 101 entering the air concentrator 111, which is beneficial to improving heat exchange efficiency.

[0141] It is understandable that, along the direction away from the air outlet 113, the density of the arrangement of some air supply holes 112 can be increased, or the density of the arrangement of air supply holes 112 can be increased sequentially, or along the direction away from the air outlet 113, multiple air outlets can be divided into multiple groups, with multiple air outlets in each group evenly arranged, and the density of air outlets in adjacent groups can be different.

[0142] Please see Figures 9 to 11 In some embodiments, multiple air supply holes 112 are arranged sequentially in a direction away from the air outlet 113. This makes the air supply structure layout regular, thereby reducing the manufacturing difficulty of the air supply structure.

[0143] Please see Figures 9 to 11 In some embodiments, along the direction away from the air outlet 113, the spacing between any two adjacent air outlets 112 tends to decrease.

[0144] It is understandable that, along the direction away from the air outlet 113, the distance between two adjacent air supply holes 112 may be reduced, or the distance between two air supply holes 112 may be reduced sequentially, or along the direction away from the air outlet 113, multiple air outlets may be divided into multiple groups, with the distance between two adjacent air outlets in each group being consistent, and the distance between air outlets in two adjacent groups being different.

[0145] In this embodiment, the above-mentioned settings can both increase the density of the air supply holes 112 in the direction away from the air outlet 113 and simplify the density variation setting method of the air supply holes 112, thereby making the structure of the first plate 11 simple, easy to manufacture, and conducive to improving the manufacturing efficiency of the first plate 11.

[0146] Please see Figure 11 In some embodiments, the air supply hole 112 is a strip-shaped hole, and the direction of the major axis of the air supply hole 112 is perpendicular to the arrangement direction of the air supply holes 112. In this way, the interval between two adjacent air supply holes 112 can form a rib-like connection, thereby ensuring the structural strength of the first plate 11 while maintaining a large area of ​​air supply hole.

[0147] In addition, the strip-shaped hole can be adapted to the structure of the housing assembly 100 to reduce the difficulty of arranging the air supply holes 112. Specifically, multiple air supply holes 112 are spaced apart along the length direction of the housing assembly 100, and the major axis of each air supply hole 112 is parallel to the width direction of the housing assembly 100.

[0148] Please see Figure 13 In some embodiments, the distance between the adjacent walls of two air supply holes 112 is D1, and the width of the air supply holes 112 in the arrangement direction is R, satisfying: 0.5R≤D1. This helps to ensure the size of the gap between two adjacent air supply holes 112, thereby ensuring the structural strength of the rib-like connection formed by the gap between two adjacent air supply holes 112, and thus improving the structural strength of the first plate 11.

[0149] Please see Figures 10 to 12In some embodiments, the first plate 11 includes a top plate 114 and an inner plate 115. The top plate 114 and the inner plate 115 are interlocked to define an air-gathering cavity 111. The inner plate 115 faces the second plate 21. An air outlet 112 is disposed on the inner plate 115. An air outlet 113 is disposed on the top plate 114. The top plate 114 is connected to the second plate 21, and the portion of the inner plate 115, the second plate 21, and the top plate 114 located between the inner plate 115 and the second plate 21 together define a mounting cavity 101.

[0150] Specifically, the top plate 114 can be glued, welded or bolted to the inner plate 115. When bolted, a sealing ring can be installed between them so that the air-gathering chamber 111 can be connected to other structures through the air supply hole 112 and the air outlet 113.

[0151] In this embodiment, the above-mentioned arrangement makes the first plate 11 composed of a top plate 114 and an inner plate 115, thereby reducing the manufacturing difficulty of the first plate 11 and improving the manufacturing efficiency of the first plate 11.

[0152] Please see Figure 9 , Figure 10 and Figure 12 In some embodiments, the top plate 114 has a groove 1141. An inner plate 115 is disposed within the groove 1141. The periphery of the inner plate 115 connects to the first groove sidewall 1142 of the groove 1141, defining an air-gathering cavity 111 between the inner plate 115 and the first groove bottom wall 1143 of the groove 1141. An air outlet 113 is disposed on the first groove sidewall 1142 and located between the first groove bottom wall 1143 and the inner plate 115. Thus, the installation position of the inner plate 115 can be quickly positioned by contacting the first groove sidewall 1142 of the groove 1141 with the inner plate 115, thereby improving the assembly efficiency between the top plate 114 and the inner plate 115 and facilitating the improvement of the manufacturing efficiency of the first plate 11.

[0153] It can be understood that the space between the inner plate 115 and the second plate 21 is the mounting cavity 101.

[0154] Please see Figure 14 In some embodiments, the inner plate 115 includes a plate body 1151 and flanges 1152. Multiple flanges 1152 are present, each connected to a multiple edge line of the plate body 1151. Each flange 1152 corresponds one-to-one with a multiple first groove sidewall 1142 of the groove 1141, with each flange 1152 abutting and connected to its corresponding first groove sidewall 1142. The plate body 1151 faces the second plate 21, and an air vent 112 is disposed on the plate body 1151. This increases the contact area 311 between the inner plate 115 and the top plate 114, thereby improving the reliability of the connection between the inner plate 115 and the top plate 114, and consequently improving the reliability of the first plate 11.

[0155] In some embodiments, both the top plate 114 and the inner plate 115 are sheet metal parts.

[0156] Specifically, the top plate 114 is welded to the inner plate 115.

[0157] It is understandable that sheet metal parts are components made from metal sheets (such as steel sheets, aluminum sheets, copper sheets, etc.) through processes such as stamping, bending, welding, and stretching.

[0158] In this embodiment, by setting the top plate 114 and the inner plate 115 to be sheet metal, the material utilization rate can be improved, waste can be reduced, and manufacturing costs and subsequent maintenance costs can be reduced.

[0159] In some embodiments, the total ventilation area of ​​the exhaust hole group 23 is S1, and the total ventilation area of ​​the air supply hole 112 is S2, satisfying: S2 > S1.

[0160] For example, 1.2S1≤S2≤1.5S1.

[0161] Specifically, S2 = 1.2S1.

[0162] It is understandable that if the total ventilation area of ​​the air supply hole 112 is less than the total ventilation area of ​​the exhaust hole group 23 during the gas flow process, it will cause the gas in the installation cavity 101 to stagnate and the pressure to rise, forming a positive pressure in the installation cavity 101, which will lead to a reduction in the air intake efficiency of the air inlet 211.

[0163] Based on this, in this embodiment, the total ventilation area of ​​the air supply hole 112 is greater than the total ventilation area of ​​the exhaust hole group 23 through the above settings, thereby avoiding the formation of positive pressure in the mounting cavity 101, so that the airflow in the mounting cavity 101 can be discharged more smoothly, thereby improving the air intake efficiency of the mounting cavity 101.

[0164] Please see Figure 3 In some embodiments, the housing assembly 100 further includes an air inlet duct 24, one end of which is connected to the second plate 21, and 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 the external pipeline through the air inlet duct 24, thereby improving the ease of operation of connecting the second plate 21 to other components.

[0165] Please see Figures 9-12 In some embodiments, the housing assembly 100 further includes an air outlet duct 12, one end of which is connected to the end of the air outlet 113 away from the air collection chamber 111. In this way, the air outlet 113 can be quickly connected to an external pipeline through the air outlet duct 12, thereby improving the ease of operation of connecting the first plate 11 to other components.

[0166] Specifically, the air outlet duct 12 is inserted into the first plate 11 and welded to it. A positioning flange 121 is fitted onto the outer circumferential surface of the air outlet duct 12. The positioning flange 121 is located outside the first plate 11 and abuts against it. In this way, the depth of the air outlet duct 12 inserted into the first plate 11 can be positioned by the positioning flange 121, which helps to improve the efficiency of assembling the air outlet duct 12 and the first plate 11.

[0167] Please see Figure 9 In some embodiments, there are multiple air outlets 113. This can improve the air outlet efficiency of the first plate 11, thereby improving the heat exchange efficiency.

[0168] In some embodiments, a sealing gasket is provided between the first plate 11 and the second plate 21, the sealing gasket extending in an annular shape around the periphery of the second plate 214. The first plate 213 is connected to the second plate 214 by screws, compressing the sealing gasket and sealing the contact surface 311 between the first plate 213 and the second plate 214. This allows the housing assembly 100 to have an IP67 or higher (Ingress Protection rating), ensuring sufficient airflow to submerge the battery cell 301 for heat exchange, thereby improving the heat exchange efficiency of the battery cell 301. The "6" in IP67 refers to a solid intrusion protection rating of 6, meaning complete protection against dust intrusion into the battery pack 1000. The "7" in IP67 refers to a waterproof intrusion protection rating of 7, meaning it is unaffected by water intrusion under specified conditions (typically immersion in 1 meter of water for 30 minutes).

[0169] Please see Figure 15 Secondly, embodiments of this application provide 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. The battery module 300 contacts the second plate 21.

[0170] The battery pack 1000 includes at least one battery module 300.

[0171] For example, the battery pack 1000 includes four battery modules 300. The four battery modules 300 are arranged sequentially along the width direction of the first flow channel 221. Correspondingly, the vent group 23 includes three second hole groups 232. The three second hole groups 232 and the four battery modules 300 are arranged alternately along the width direction of the first flow channel 221.

[0172] For example, each battery module 300 includes 12 battery cells 301 arranged in sequence. Correspondingly, the vent group 23 includes 11 first hole groups 231. The 11 first hole groups 231 and the 12 battery cells 301 are arranged alternately along the length direction of the first flow channel 221.

[0173] 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.

[0174] Compared to liquid-cooled battery packs, the air-cooled battery pack 1000 in this embodiment has the advantages of simple structure, no risk of liquid leakage, low maintenance cost, convenient maintenance, and high environmental adaptability. The battery pack 1000 also has the advantages of lightweight design and large cooling coverage area.

[0175] In this embodiment, the battery cells 301 inside the battery pack 1000 are enclosed in air, which enables a fully submerged temperature management scheme. This allows for large-area heat exchange of the battery cells 301, thereby reducing the temperature difference between the battery cells 301 and improving the temperature uniformity of the battery cells 301.

[0176] Please see Figure 16 In some embodiments, the battery module 300 includes clamping plates 31, battery cells 301, connecting bars 302, module end plates 303, and binding straps 304. Multiple clamping plates 31 and multiple battery cells 301 are present. Multiple battery cells 301 and multiple clamping plates 31 are arranged alternately in a direction perpendicular to the clamping plates 31 to form a battery cell array. Each clamping plate 31 has one battery cell 301 attached to each of its two sides. Connecting bars 302 electrically connect the multiple battery cells 301. Two module end plates 303 are respectively disposed at both ends of the battery cell array. Binding straps 304 are fitted onto the module end plates 303 and the battery cell array to bind the module end plates 303 and the battery cell array together.

[0177] It is understandable that cell 301 is a prismatic cell 301.

[0178] It is understandable that the battery cell 301 is connected in series or parallel through the connecting bar 302.

[0179] For example, the clamping plate 31 is elastic and is in a compressed state. Thus, when the battery cell 301 expands due to heat, the deformation recovery force of the clamping plate 31 can offset part of the expansion force of the battery cell 301, thereby effectively suppressing the expansion of the battery cell 301 and helping to ensure the reliability of the electrical connection between the battery cells 301.

[0180] Please see Figures 17 to 18In some embodiments, the clamping plate 31 has two opposing contact surfaces 311 and two opposing first end surfaces 312. The contact surfaces 311 are in contact with adjacent battery cells 301. The two first end surfaces 312 are located between the two contact surfaces 311 and are connected to both contact surfaces 311. The first end surfaces 312 and contact surfaces 311 are interconnected to define a connecting edge 313. A plurality of first through holes 321 are provided on the clamping plate 31. The plurality of first through holes 321 are spaced apart along the length of the connecting edge 313 and penetrate the two first end surfaces 312. One end of the plurality of first through holes 321 communicates with the exhaust hole group 23, and the other end faces the air collecting cavity 111.

[0181] Specifically, the end of the first through hole 321 that is away from the air-gathering cavity 111 is connected to the first air hole 2311.

[0182] For example, the side of the first end face 312 away from the air-gathering cavity 111 contacts the second plate 21.

[0183] When managing the temperature of the battery cell 301, airflow is delivered into the first through hole 321 through the air inlet 211, the air duct 22, and part of the exhaust hole group 23. After the airflow enters the first through hole 321, it exchanges heat with the clamping plate 31, thereby carrying away the heat from the clamping plate 31. The clamping plate 31 continuously absorbs the heat from the battery cell 301 or transfers the heat from the airflow to the battery cell 301, thereby carrying away the heat from the battery cell 301 or raising the temperature of the battery cell 301 to manage its temperature.

[0184] In this embodiment, by providing the clamping plate 31, airflow can be introduced into the clamping plate 31 through the first through hole 321, allowing the airflow to exchange heat with the clamping plate 31 and thus manage the temperature of the battery cell 301. This improves the heat exchange efficiency of the battery cell 301, thereby enhancing the reliability of the clamping plate 31.

[0185] Please see Figures 17 to 18 In some embodiments, a plurality of through-hole groups are also provided on the clamping plate 31. The plurality of through-hole groups are spaced apart along the length direction of the connecting edge 313 and correspond one-to-one with a plurality of first through holes 321. Each through-hole group includes a plurality of second through holes 33 spaced apart along the axis of the first through holes 321. The second through holes 33 of each through-hole group penetrate both of the contact surfaces 311 and the corresponding first through holes 321.

[0186] When managing the temperature of the battery cell 301, airflow is delivered into the first through-hole 321 through the air inlet 211, air duct 22, and part of the exhaust hole group 23. After entering the first through-hole 321, part of the airflow exchanges heat with the clamping plate 31, and the other part contacts the battery cell 301 through the second through-hole 33 for heat exchange. When there is a gap between the battery cell 301 and the through-hole group, the airflow entering the second through-hole 33 can also flow along the gap to the air outlet 113. Then, the airflow in the mounting cavity 101 is discharged through the air outlet 113. In this way, heat exchange with the battery cell 301 is achieved through air cooling to manage the temperature of the battery cell 301.

[0187] In this embodiment, the above-described scheme not only allows airflow to be introduced into the clamping plate 31 through the first through-hole 321, enabling heat exchange between the airflow and the clamping plate 31 for temperature management of the battery cell 301, but also allows airflow to be directed to the surface of the battery cell 301 through the second through-hole 33, allowing direct contact between the airflow and the battery cell 301 for direct temperature management. This improves the heat exchange efficiency of the battery cell 301, thereby enhancing the reliability of the clamping plate 31.

[0188] Please see Figure 17 and Figure 18 In some embodiments, a plurality of buffer grooves 34 are provided on the contact surface 311, and the plurality of buffer grooves 34 correspond one-to-one with a plurality of through-hole groups, with the through-hole groups disposed on the bottom wall of the corresponding buffer groove 34. In this way, the buffer grooves 34 provide buffer space for the fluid output from the second through-hole 33, allowing more airflow to flow into the buffer grooves 34, thereby enabling the airflow to more fully contact and exchange heat with the battery cell 301. This improves the heat exchange efficiency of the battery cell 301.

[0189] Please see Figure 18 In some embodiments, the depth of the buffer groove 34 is Da, which satisfies: 0.5mm≤Da≤0.8mm.

[0190] It is understood that the depth Da of the buffer groove 34 is, but is not limited to, 0.5mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm, 0.61mm, 0.62mm, 0.63mm, 0.64mm, 0.65mm, 0.66mm, 0.67mm, 0.68mm, 0.69mm, 0.7mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, and 0.8mm.

[0191] In this embodiment, by limiting the depth Da of the buffer groove 34, on the one hand, the buffer groove 34 can have a sufficient depth dimension to provide sufficient buffer space for the airflow from the second through hole 33; on the other hand, the depth Db of the buffer groove 34 can be avoided from being too large and affecting the structural strength of the clamping plate 31, so as to ensure the reliability of the clamping plate 31.

[0192] Please see Figure 17 The buffer groove 34 is a through groove extending through the axis of the first through hole 321. In this way, the airflow entering the buffer groove 34 can be discharged through the end of the buffer groove 34, thereby increasing the cross-sectional area of ​​the channel for airflow in the clamping plate 31, which helps to increase the airflow velocity and thus improve the heat exchange efficiency of the cell 301.

[0193] Please see Figures 17 to 19 In some embodiments, the inner wall of the buffer groove 34 includes a second groove bottom wall 341 and a second groove side wall 342 connected together, with the second groove bottom wall 341 transitioning to the second groove side wall 342 by an arc. This can improve the stress state at the connection between the second groove bottom wall 341 and the second groove side wall 342 and avoid stress concentration.

[0194] Please see Figures 17 to 19 In some embodiments, the bottom wall 341 of the second groove transitions to the side wall 342 of the second groove in an arc to form a rounded corner surface 343, the radius of which is 0.4π to 0.6π. This allows the bottom wall 341 of the second groove to transition to the side wall 342 of the second groove more smoothly, thereby reducing stress concentration.

[0195] For example, the radius of the rounded corner 343 is the same as the angle between the bottom wall 341 of the second groove and the side wall 342 of the second groove.

[0196] Please see Figures 17 to 19 In some embodiments, the inner wall of the buffer groove 34 includes a second groove bottom wall 341 and a second groove side wall 342 connected together, with one end of the second groove side wall 342 away from the second groove bottom wall 341 rounded off to the adjacent contact surface 311. This improves the stress state at the connection between the second groove side wall 342 and the contact surface 311, avoiding stress concentration.

[0197] Please see Figure 19 , Figure 19 This is a partial structural schematic diagram of the clamping plate 31 provided in an embodiment of this application. In some embodiments, in each group of through holes, the distance between the adjacent holes of two second through holes 33 is Db, which satisfies: 0.8mm≤Db≤2mm.

[0198] It is understood that the spacing Db between the adjacent second through holes 33 is, but is not limited to, 0.8mm, 0.82mm, 0.84mm, 0.86mm, 0.88mm, 0.9mm, 0.92mm, 0.94mm, 0.96mm, 0.98mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.20mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, and 2mm.

[0199] In this embodiment, by limiting the distance Db between the adjacent holes of two second through holes 33, on the one hand, it can help ensure that the part of the clamping plate 31 located between the two adjacent second through holes 33 has sufficient size to ensure the structural strength of this part, thereby improving the reliability of the clamping plate 31; on the other hand, it can control the distance Db between the adjacent holes of two second through holes 33, so that more second through holes 33 can be arranged on the clamping plate 31, so that the airflow and the battery cell 301 have a larger contact area 311, thereby improving the heat exchange efficiency of the battery cell 301.

[0200] Please see Figure 19 In some embodiments, the second through hole 33 is an oval hole, and the direction of the major axis of the second through hole 33 is parallel to the length direction of the connecting edge 313. In this way, the second through hole 33 can have a larger cross-sectional area, which is conducive to improving airflow efficiency. At the same time, it can also reduce the number of inflection points of the second through hole 33, which helps to avoid stress concentration and improve the stress state of the clamping plate 31.

[0201] Please see Figure 18 In some embodiments, a plurality of third through holes 322 are also provided on the clamping plate 31. Each of the plurality of third through holes 322 penetrates both first end faces 312. The plurality of third through holes 322 and the first through holes 321 are sequentially and alternately distributed along the length of the connecting edge line 313. This increases the flow rate through which the clamping plate 31 guides the airflow from the bottom of the battery cell 301 into the clamping plate 31 and directs the airflow within the clamping plate 31 to the top of the battery cell 301, thereby improving heat exchange efficiency.

[0202] Please see Figure 18In some embodiments, a plurality of connecting ribs 35 are provided on the clamping plate 31. Each connecting rib 35 corresponds one-to-one with a plurality of third through holes 322. Each connecting rib 35 is disposed within its corresponding third through hole 322 and connected to a portion of the hole wall of the third through hole 322. This increases the channel area of ​​the clamping plate 31 for airflow while maintaining the structural strength of the clamping plate 31, effectively suppressing the expansion of the battery cell 301.

[0203] Please see Figure 18 In some embodiments, the connecting rib 35 divides the corresponding third through hole 322 into multiple sub-through holes 3221. The axes of the multiple sub-through holes 3221 are parallel to the axis of the first through hole 321. In this way, the channel area of ​​the clamping plate 31 for airflow can be increased, and the turbulence in the third through hole 322 can be reduced, thereby improving the smoothness of airflow in the third through hole 322.

[0204] Please see Figure 18 In some embodiments, along the length of the connecting edge 313, each first through hole 321 is connected to an adjacent sub-through hole 3221 on both sides. This increases the channel area of ​​the clamping plate 31 for airflow, thereby increasing the airflow through the clamping plate 31 and improving the heat exchange efficiency of the battery cell 301.

[0205] Please see Figure 17 and Figure 18 In some embodiments, two connecting ribs 35 are provided in the third through hole 322 located in the middle of the clamping plate 31, and the two connecting ribs 35 are arranged sequentially along the length direction of the connecting edge line 313.

[0206] For example, there are 9 third through holes 322, which are arranged sequentially along the length of the connecting edge line 313. The third through hole 322 numbered 5 is provided with two connecting ribs 35.

[0207] In this embodiment, the above-mentioned arrangement can enhance the structural strength of the middle part of the clamping plate 31, thereby improving the structural strength of the clamping plate 31 and enabling it to effectively suppress the expansion of the battery cell 301.

[0208] Please see Figure 18 In some embodiments, the connecting rib 35 has a cross structure. Two ends of the connecting rib 35 are connected to the hole wall of the third through hole 322 near one plate surface. The other two ends of the connecting rib 35 are connected to the hole wall of the third through hole 322 near the other plate surface. In this way, the connecting rib 35 has a simple structure and strong structural strength, which helps to improve the structural strength of the clamping plate 31.

[0209] In some embodiments, the clamping plate 31 is made of plastic. It is understood that plastic is elastic. This allows the clamping plate 31 to have a certain degree of elasticity, so that when the battery cell 301 expands due to heat, the deformation recovery force of the clamping plate 31 can offset part of the expansion force of the battery cell 301, thereby effectively suppressing the expansion of the battery cell 301. It also allows for control over the material cost and weight of the clamping plate 31, thus facilitating its lightweight design.

[0210] 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 box assembly (100) characterized by, include: The first plate (11) has an air supply hole (112), an air gathering cavity (111) and an air outlet (113) connected in sequence; as well as The second plate (21) covers the first plate (11) to define the mounting cavity (101); the second plate (21) has an air inlet (211), an air duct (22) and an exhaust hole group (23) connected in sequence. The air duct (22) is disposed in the second plate (21). The air duct (22) includes an air inlet space (223) and a plurality of first flow channels (221). One end of 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 connected to the mounting cavity (101) through the exhaust hole group (23). The mounting cavity (101) is connected to the end of the air outlet (112) away from the air gathering cavity (111); The plurality of first flow channels (221) are arranged sequentially along a first direction, which is perpendicular to the extension direction of the first flow channel (221) and parallel to the surface of the second plate (21) facing the first plate (11).

2. The box assembly (100) according to claim 1, characterized in that 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 box assembly (100) according to claim 2, characterized in that The first edge (2231) is an arc-shaped structure protruding toward the first flow channel (221).

4. The box assembly (100) of claim 3, wherein, The second plate (21) has a bearing surface (212) facing the air-gathering cavity (111), and in a projection plane parallel to the bearing surface (212), the projection of the center point of the air inlet (211) is located in the projection of the line of symmetry of the first edge (2231).

5. The housing assembly (100) 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 housing assembly (100) according to claim 5, characterized in that, 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 housing assembly (100) according to claim 6, characterized in that, 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 housing assembly (100) according to claim 7, characterized in that, 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 housing assembly (100) according to claim 5, characterized in that, 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 housing assembly (100) according to 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 housing assembly (100) according to claim 10, characterized in that, 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 housing assembly (100) according to 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 housing assembly (100) according to any one of claims 1-4, characterized in that, The second plate (21) has a bearing surface (212) facing the air-gathering cavity (111), and the exhaust hole group (23) is disposed on the bearing surface (212). 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 holes (2311) communicate with the air duct (22). And / or, 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), which are spaced apart along the extension direction of the first flow channel (221). The second air holes (2321) are connected to the air channel (22).

14. The housing assembly (100) according to any one of claims 1-4, characterized in that, The second plate (21) includes: First board (213); The second plate (214) is parallel to and opposite to the first plate (213), and the exhaust hole group (23) is provided on the surface of the second plate (214) away from the first plate (213); 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).

15. The housing assembly (100) according to any one of claims 1-4, characterized in that, There are multiple air supply holes (112), and the density of the arrangement of the air supply holes (112) increases along the direction away from the air outlet (113).

16. The housing assembly (100) according to claim 15, characterized in that, The plurality of air supply holes (112) are arranged sequentially in a direction away from the air outlet (113).

17. The housing assembly (100) according to claim 16, characterized in that, Along the direction away from the air outlet (113), the spacing between any two adjacent air outlets (112) tends to decrease.

18. The housing assembly (100) according to claim 16, characterized in that, The air supply hole (112) is a strip-shaped hole, and the direction of the major axis of the air supply hole (112) is perpendicular to the arrangement direction of the air supply hole (112).

19. The housing assembly (100) according to claim 18, characterized in that, The distance between the adjacent walls of two air supply holes (112) is D1, and the width of the air supply hole (112) in the arrangement direction is R, satisfying: 0.5R≤D1.

20. The housing assembly (100) according to any one of claims 1-4, characterized in that, The first plate (11) includes a top plate (114) and an inner plate (115). The top plate (114) and the inner plate (115) are interlocked to define the air-gathering cavity (111). The inner plate (115) faces the second plate (21). The air supply hole (112) is disposed on the inner plate (115), and the air outlet (113) is disposed on the top plate (114). The top plate (114) is connected to the second plate (21), and the inner plate (115), the second plate (21) and the top plate (114) located between the inner plate (115) and the second plate (21) together define the mounting cavity (101).

21. The housing assembly (100) according to claim 20, characterized in that, The top plate (114) has a groove (1141), and the inner plate (115) is disposed in the groove (1141). The periphery of the inner plate (115) is connected to the first groove sidewall (1142) of the groove (1141) to define the air-gathering cavity (111) between the inner plate (115) and the first groove bottom wall (1143) of the groove (1141). The air outlet (113) is disposed on the side wall (1142) of the first groove and is located between the bottom wall (1143) of the first groove and the inner plate (115).

22. The housing assembly (100) according to claim 21, characterized in that, The inner plate (115) includes a plate body (1151) and flanges (1152). There are multiple flanges (1152), and the multiple flanges (1152) are respectively connected to multiple edge lines of the plate body (1151). The multiple flanges (1152) correspond one-to-one with multiple first groove sidewalls (1142) of the groove (1141). Each flange (1152) is attached and connected to the corresponding first groove sidewall (1142). The main body of the plate (1151) faces the second plate (21), and the air supply hole (112) is disposed on the main body of the plate (1151).

23. The housing assembly (100) according to claim 20, characterized in that, Both the top plate (114) and the inner plate (115) are sheet metal parts.

24. The housing assembly (100) according to any one of claims 1-4, characterized in that, The total ventilation area of ​​the exhaust hole group (23) is S1, and the total ventilation area of ​​the air supply hole (112) is S2, satisfying that: S2 > S1.

25. The housing assembly (100) according to any one of claims 1-4, characterized in that, The housing assembly (100) further includes an air inlet pipe (24), one end of which is connected to the second plate (21), and the inner hole of the air inlet pipe (24) communicates with the air inlet (211); and / or, The housing assembly (100) also includes an air outlet pipe (12), one end of which is connected to the end of the air outlet (113) away from the air gathering chamber (111).

26. A battery pack (1000), characterized in that, include: The housing assembly (100) as described in any one of claims 1-25; as well as A battery module (300) is disposed in the mounting cavity (101), and the battery module (300) is in contact with the second plate (21).

27. The battery pack (1000) according to claim 26, characterized in that, The battery module (300) includes: Multiple clamps (31); Multiple battery cells (301) are arranged alternately with multiple clamping plates (31) in a direction perpendicular to the clamping plates (31) to form a battery cell row, and each clamping plate (31) has a battery cell (301) attached to each side; A connecting bar (302) electrically connects multiple of the battery cells (301); Two module end plates (303) are respectively disposed at both ends of the cell array; and A strap (304) is fitted onto the module end plate (303) and the battery cell array to bind the module end plate (303) and the battery cell array together.

28. The battery pack (1000) according to claim 27, characterized in that, The clamp (31) has two oppositely arranged contact surfaces (311) and two oppositely arranged first end surfaces (312). The contact surfaces (311) are in contact with the adjacent battery cell (301). The two first end surfaces (312) are located between the two contact surfaces (311) and are connected to the two contact surfaces (311). The first end surfaces (312) and the contact surfaces (311) are connected to each other to define the connection edge (313). A plurality of first through holes (321) are provided on the clamping plate (31). The plurality of first through holes (321) are spaced apart along the length direction of the connecting edge line (313) and penetrate through the two first end faces (312). One end of each of the plurality of first through holes (321) is connected to the exhaust hole group (23), and the other end is directed toward the air gathering cavity (111).

29. The battery pack (1000) according to claim 28, characterized in that, Multiple through-hole groups are also provided on the clamping plate (31). The multiple through-hole groups are spaced apart along the length direction of the connecting edge line (313) and correspond one-to-one with the multiple first through holes (321). Each of the through-hole groups includes multiple second through holes (33) spaced apart along the axis of the first through hole (321). The second through holes (33) of each of the through-hole groups penetrate both of the contact surfaces (311) and the corresponding first through hole (321).

30. The battery pack (1000) according to claim 29, characterized in that, Multiple buffer grooves (34) are provided on the contact surface (311), and the multiple buffer grooves (34) correspond one-to-one with the multiple through hole groups. The through hole groups are provided on the bottom wall of the corresponding buffer groove (34).

31. The battery pack (1000) according to claim 30, characterized in that, The depth of the buffer groove (34) is Da, satisfying: 0.5mm ≤ Da ≤ 0.8mm; and / or, The buffer groove (34) is a through groove that extends through the axis of the first through hole (321).

32. The battery pack (1000) according to claim 30, characterized in that, The inner wall of the buffer groove (34) includes a second bottom wall (341) and a second side wall (342) connected to each other, with the second bottom wall (341) transitioning to the second side wall (342) in an arc.

33. The battery pack (1000) according to claim 32, characterized in that, The bottom wall (341) of the second groove transitions to the side wall (342) of the second groove to form a rounded corner surface (343), the radius of which is 0.4π to 0.6π.

34. The battery pack (1000) according to claim 30, characterized in that, The inner wall of the buffer groove (34) includes a second groove bottom wall (341) and a second groove side wall (342) connected to each other, and the end of the second groove side wall (342) away from the second groove bottom wall (341) is arc-shaped to the adjacent contact surface (311).

35. The battery pack (1000) according to any one of claims 29-34, characterized in that, In each of the through-hole groups, the distance between the adjacent holes of two second through holes (33) is Db, which satisfies: 0.8mm≤Db≤2mm.

36. The battery pack (1000) according to any one of claims 29-34, characterized in that, The second through hole (33) is an oval hole, and the direction of the major diameter of the second through hole (33) is parallel to the length direction of the connecting edge line (313).

37. The battery pack (1000) according to any one of claims 28-34, characterized in that, The clamping plate (31) is also provided with a plurality of third through holes (322), each of which penetrates the two first end faces (312). The plurality of third through holes (322) and the plurality of first through holes (321) are distributed alternately along the length of the connecting edge line (313).

38. The battery pack (1000) according to claim 37, characterized in that, The clamp (31) is provided with a plurality of connecting ribs (35), and the plurality of connecting ribs (35) correspond one-to-one with the plurality of third through holes (322). Each connecting rib (35) is provided in the corresponding third through hole (322) and is connected to a portion of the hole wall of the third through hole (322).

39. The battery pack (1000) according to claim 38, characterized in that, The connecting rib (35) divides the corresponding third through hole (322) into multiple sub-through holes (3221), and the axes of the multiple sub-through holes (3221) are parallel to the axis of the first through hole (321).

40. The battery pack (1000) according to claim 39, characterized in that, Along the length of the connecting edge (313), each of the first through holes (321) is connected to the adjacent sub-through holes (3221) on both sides.

41. The battery pack (1000) according to claim 38, characterized in that, Two connecting ribs (35) are provided in the third through hole (322) located in the middle of the clamping plate (31), and the two connecting ribs (35) are arranged sequentially along the length direction of the connecting edge line (313).

42. The battery pack (1000) according to claim 38, characterized in that, The connecting rib (35) has a cross structure. Two ends of the connecting rib (35) are connected to the wall of the third through hole (322) near one of the contact surfaces (311), and the other two ends of the connecting rib (35) are connected to the wall of the third through hole (322) near the other contact surface (311).

43. The battery pack (1000) according to any one of claims 28-34, characterized in that, The clamp (31) is made of plastic.

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