Box assembly and battery pack

Abstract

The utility model provides a box body assembly and a battery pack, the box body assembly comprises a box body, and the box body comprises a first cooling plate, a second cooling plate and a front panel; the liquid cooling joint group comprises a first liquid cooling joint and a second liquid cooling joint, the second liquid cooling joint comprises a first switching section, a second switching section and a third switching section, the first switching section is connected to the second cooling plate, the second switching section and the third switching section are both connected with the first switching section, the second switching section is used for being connected with an external liquid cooling structure, and the third switching section is used for being connected with the external liquid cooling structure. The distance between the orthographic projection of the first liquid cooling connector and the orthographic projection of the first switching section on the plane where the second cooling plate is located is D1, the distance between the first switching section and the side edge is D2, and D2 is larger than D1. Compared with the prior art, the distance between the second liquid cooling connector and the external frame is larger than that between the first liquid cooling connector and the second liquid cooling connector, so that the space and the cost of the front panel are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a box body assembly and a battery pack. Background Art

[0002] In the related art, a battery pack is used to install battery modules in a vehicle. When the battery operates at high power, a large amount of heat will be generated by the battery. In order to ensure the temperature consistency inside the battery pack to avoid large heat affecting the life and performance of the battery, or causing thermal runaway of the battery pack due to too high temperature, a cooling system is arranged inside the battery pack to cool the battery modules. The cooling system is connected through a coolant delivery pipeline, and the coolant delivery pipeline is externally connected to devices such as a coolant delivery pump. The connection between the cooling channel and the coolant delivery pipeline is realized through a water-cooled joint. The existing coolant delivery pipeline is unreasonably arranged, increasing the cost of the pipeline. Summary of the Utility Model

[0003] An embodiment of the utility model provides a box body assembly and a battery pack, which can improve the technical problem of too high cost of the cooling system.

[0004] This application provides a box body assembly, which includes:

[0005] A box body, including a first cooling plate and a second cooling plate arranged oppositely, and a front panel connected between the first cooling plate and the second cooling plate, the front panel including oppositely arranged side edges;

[0006] A liquid cooling joint group, including a first liquid cooling joint and a second liquid cooling joint, the first liquid cooling joint is connected to the first cooling plate;

[0007] The second liquid cooling joint includes a first transition section, a second transition section and a third transition section. The first transition section is connected to the second cooling plate, the second transition section and the third transition section are both connected to the first transition section. The second transition section is used to connect an external liquid cooling structure. The third transition section and the second transition section extend in opposite directions and communicate with the first liquid cooling joint. The distance between the orthographic projection of the first liquid cooling joint on the plane where the second cooling plate is located and the orthographic projection of the first transition section on the plane where the second cooling plate is located is D1, and the distance from the first transition section to the side edge is D2, and D2 is greater than D1.

[0008] In some embodiments, the first cooling plate includes a first protruding portion protruding from the front panel, and the first liquid cooling joint is connected to the first protruding portion;

[0009] In some embodiments, the second cooling plate includes a second protruding portion protruding from the front panel, and the second liquid cooling joint is connected to the second protruding portion.

[0010] In some embodiments, the box body assembly further includes a liquid cooling pipe, the liquid cooling pipe includes a first liquid cooling section, a connecting section and a second liquid cooling section connected in sequence, the first liquid cooling section extends and is connected to the first liquid cooling joint along a first direction, the second liquid cooling section extends along a second direction and is connected to the second liquid cooling joint, the first direction and the second direction are different, and the connecting section is bent and connected between the first liquid cooling section and the second liquid cooling section.

[0011] In some embodiments, the box body assembly includes two sets of the liquid cooling joints and two liquid cooling pipes, each liquid cooling pipe is arranged corresponding to one set of liquid cooling joints, one liquid cooling pipe is used for inputting coolant, and the other liquid cooling pipe is used for outputting coolant.

[0012] In some embodiments, the bending radius of the connecting section is R1, and the length of D1 is not less than the length of R1.

[0013] In some embodiments, the first liquid cooling section, the second liquid cooling section and the connecting section are of an integrally formed structure.

[0014] In some embodiments, each second liquid cooling joint includes a first transfer section, a second transfer section and a third transfer section, the first transfer section is connected to the second cooling plate, both the second transfer section and the third connection are connected to the first transfer section, the second transfer section is used for connecting an external liquid cooling structure, and the third transfer section is connected to the second liquid cooling section.

[0015] In some embodiments, the first transfer section extends along a first direction, the second transfer section and the third transfer section extend along a second direction, and the second transfer section and the third transfer section extend in opposite directions.

[0016] In some embodiments, a plurality of liquid cooling channels are provided in the second cooling plate and penetrate through in a third direction, openings communicating with the liquid cooling channels are respectively formed at both ends of the second cooling plate, the plurality of liquid cooling channels are arranged along the second direction, the box body assembly includes two liquid cooling plug strips, each liquid cooling plug strip plugs one of the openings, an opening communicating with the second liquid cooling joint is formed in the second cooling plate along the first direction, and the opening communicates with the liquid cooling channel, and the third direction is perpendicular to the first direction and the second direction.

[0017] In some embodiments, the second cooling plate includes a main board and sub-boards arranged on both sides of the main board, the box body assembly further includes side plates oppositely arranged along the second direction, the side plates are arranged along the first direction, and each side plate is vertically connected to one sub-board.

[0018] Second aspect, a battery pack of the present application includes:

[0019] A battery module;

[0020] The foregoing box assembly, wherein the first cooling plate covers the box to form a receiving chamber, the battery module is disposed in the receiving chamber, and the second cooling plate is located at the bottom of the battery module.

[0021] Beneficial effects of the embodiments of the present utility model:

[0022] In an embodiment of the present utility model, the box assembly includes a box, and the box includes a first cooling plate, a second cooling plate, and a front panel; the liquid cooling joint group includes a first liquid cooling joint and a second liquid cooling joint, the second liquid cooling joint includes a first transition section, a second transition section, and a third transition section, the first transition section is connected to the second cooling plate, the second transition section and the third transition section are both connected to the first transition section, the second transition section is used for connecting an external liquid cooling structure, the third transition section and the second transition section extend in directions away from each other, the distance between the orthographic projection of the first liquid cooling joint on the plane where the second cooling plate is located and the orthographic projection of the first transition section on the plane where the second cooling plate is located is D1, the distance from the first transition section to the side is D2, and D2 is greater than D1. The present application provides a novel liquid cooling design solution. Compared with the prior art, the distance between the second liquid cooling joint and the external vehicle frame is greater than the distance between the first liquid cooling joint and the second liquid cooling joint, so as to save the space and cost of the front panel. At the same time, when connecting to the vehicle, a larger bending radius of the liquid cooling pipeline of the external liquid cooling pipe can be tolerated, improving the space utilization rate. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is the front view of the box assembly provided by the embodiment of the present utility model;

[0025] Figure 2 is the exploded view of the box assembly provided by the embodiment of the present utility model Figure 1 ;

[0026] Figure 3 is the structural schematic diagram of the box assembly provided by the embodiment of the present utility model Figure 1 ;

[0027] Figure 4 is Figure 3 the enlarged schematic view of the partial A of the said embodiment;

[0028] Figure 5The explosion of the box body assembly provided by the embodiment of the present utility model Figure 2 .

[0029] Reference signs:

[0030] 100, box body assembly;

[0031] 10, box body; 11, first cooling plate; 111, first protruding part; 12, second cooling plate; 121, second protruding part; 122, main board; 123, sub-board; 13, front panel; 14, side panel;

[0032] 20, liquid cooling joint group; 21, first liquid cooling joint; 22, second liquid cooling joint; 221, first transfer section; 222, second transfer section; 223, third transfer section;

[0033] 30, liquid cooling pipe; 31, first liquid cooling section; 32, second liquid cooling section; 33, connection section;

[0034] 40, liquid cooling flow channel;

[0035] 50, liquid cooling plug strip; Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" are in terms of the outline of the device.

[0037] In the related art, the battery pack is used to install battery modules in a vehicle. When the battery operates at high power, the battery generates a large amount of heat. In order to ensure the temperature consistency inside the battery pack, avoid large amounts of heat affecting the life and performance of the battery, or cause thermal runaway of the battery pack due to excessive temperature, a cooling system will be arranged inside the battery pack to cool the battery modules. The cooling system is connected through a coolant delivery pipeline, and the coolant delivery pipeline is externally connected to devices such as a coolant delivery pump. The connection between the cooling channel and the coolant delivery pipeline is achieved through a water cooling joint. The existing coolant delivery pipeline is not reasonably arranged, and the battery liquid cooling efficiency is low.

[0038] Please refer to Figures 1 - 3 ,Figure 1 is the front view of the box assembly provided by the embodiment of the present utility model, Figure 2 is the explosion Figure 1 , Figure 3 is the structural schematic Figure 1 of the box assembly provided by the embodiment of the present utility model. This application provides a box assembly 100, and the box assembly 100 includes a box body 10 and a liquid cooling joint group 20. The box body 10 includes a first cooling plate 11 and a second cooling plate 12 which are oppositely arranged, and a front panel 13 connected between the first cooling plate 11 and the second cooling plate 12. The front panel 13 includes opposite sides, and the front panel 13 is vertically arranged between the first cooling plate 11 and the second cooling plate 12, that is, one end of the front panel 13 is vertically connected to the first cooling plate 11, and the other end is vertically connected to the second cooling plate 12.

[0039] The liquid cooling joint group 20 includes a first liquid cooling joint 21 and a second liquid cooling joint 22. The first liquid cooling joint 21 is connected to the first cooling plate 11 and is arranged along a first direction, and the second liquid cooling joint 22 is connected to the second cooling plate 12 and is arranged along a second direction. The first direction and the second direction are different. The first direction can be perpendicular to the second direction. For example, the first direction can be the height direction of the box assembly 100, and the second direction can be the width direction of the box assembly 100.

[0040] Please refer to Figure 4 , Figure 4 is Figure 3 the enlarged schematic view of the partial A of the above-mentioned embodiment. In some embodiments, the second liquid cooling joint 22 includes a first adapter section 221, a second adapter section 222 and a third adapter section 223. The first adapter section 221 is connected to the second cooling plate 12, and both the second adapter section 222 and the third adapter section 223 are connected to the first adapter section 221. The second adapter section 222 is used to connect an external liquid cooling structure, and the third adapter section 223 is connected to the second liquid cooling section 32.

[0041] In some embodiments, the first adapter section 221 is arranged to extend along the first direction, the second adapter section 222 and the third adapter section 223 extend along the second direction, and the second adapter section 222 and the third adapter section 223 extend in opposite directions and communicate with the first liquid cooling joint 21. The distance between the orthographic projection of the first liquid cooling joint 21 on the plane where the second cooling plate 12 is located and the orthographic projection of the first adapter section 221 on the plane where the second cooling plate 12 is located is D1, and the distance from the first adapter section 221 to the side is D2, and the D2 is greater than D1.

[0042] Among them, the second transition section 222 and the third transition section 223 are arranged at the same height from the second cooling plate 12. The coolant entering from the second transition section 222 enters the second cooling plate 12 all the way through the first transition section 221, and the other way enters the second liquid cooling section 32 through the third transition section 223 and enters the first cooling plate 11 through the first liquid cooling section 31.

[0043] In some embodiments, the second liquid cooling joint 22 is connected to the second cooling plate 12 by welding. In addition, it can also be connected by riveting, screwing, etc. The present application does not limit the specific connection method herein.

[0044] Specifically, in the design of a traditional liquid cooling system, the length of D1 is relatively long, resulting in a relatively long distance between the liquid cooling joints of the two cooling plates, increasing the cost of the pipes in the liquid cooling system and occupying more space on the front panel 13. Compared with the prior art, the distance between the second liquid cooling joint 22 and the external vehicle frame is greater than the distance between the first liquid cooling joint 21 and the second liquid cooling joint 22 to save the space and cost of the front panel. At the same time, when connected to the vehicle, it can allow a larger bending radius of the liquid cooling pipes of the external liquid cooling pipes, improving the space utilization rate.

[0045] In some embodiments, the first cooling plate 11 includes a first protruding portion 111, and the first protruding portion 111 protrudes from the front panel 13, and the first liquid cooling joint 21 is connected to the first protruding portion 111.

[0046] In some embodiments, the second cooling plate 12 includes a second protruding portion 121, and the second protruding portion 121 protrudes from the front panel 13, and the first transition section 221 is connected to the second protruding portion 121.

[0047] It can be understood that by arranging the liquid cooling pipe 30 outside the front panel 13, it is possible to prevent the liquid cooling pipe 30 and the liquid cooling joint group 20 from occupying the internal space of the battery box 10, expanding the space inside the battery box 10. At the same time, even if leakage occurs at the first liquid cooling joint 21 or the second liquid cooling joint 22, the coolant will not enter the inside of the battery box 10, thereby improving the battery safety.

[0048] In some embodiments, the orthographic projections of the second liquid cooling joint 22 and the first liquid cooling joint 21 on the plane where the second cooling plate 12 is located are staggeredly arranged. It can be understood that in the first direction, the first liquid cooling joint 21 and the second liquid cooling joint 22 are staggeredly arranged, that is, the first liquid cooling joint 21 and the second liquid cooling joint 22 are not on the same straight line, and the orthographic projections of the first liquid cooling joint 21 and the second liquid cooling joint 22 on the plane where the second cooling plate 12 is located do not coincide.

[0049] In some examples, the first protruding portion 111 is located in the middle of the first cooling plate 11, and the length of the second protruding portion 121 is equal to the length of the second cooling plate 12. The first liquid cooling joint 21 is close to the central axis in the length direction of the front panel 13, the second liquid cooling joint 22 is far from the central axis in the length direction of the front panel 13, and the second liquid cooling section 32 is close to the second cooling plate 12 and extends in a direction away from the central axis in the length direction of the front panel 13.

[0050] In some examples, the length of the first protruding portion 111 is equal to the length of the first cooling plate 11, and the second protruding portion 121 is located in the middle of the second cooling plate 12. The second liquid cooling joint 22 is close to the central axis in the length direction of the front panel 13, the first liquid cooling joint 21 is far from the central axis in the length direction of the front panel 13, and the second liquid cooling section 32 is close to the first cooling plate 11 and extends in a direction away from the central axis in the length direction of the front panel 13.

[0051] In some embodiments, the box body group 100 further includes a liquid cooling pipe 30. The liquid cooling pipe 30 includes a first liquid cooling section 31, a connecting section 33, and a second liquid cooling section 32 that are connected in sequence. The first liquid cooling section 31 extends and connects in a first direction and is connected to the first liquid cooling joint 21. The second liquid cooling section 32 extends in a second direction and is connected to the second liquid cooling joint 22. The connecting section 33 is bent and connected between the first liquid cooling section 31 and the second liquid cooling section 32.

[0052] It should be noted that the pipe radii of the first liquid cooling section 31, the connecting section 33, and the second liquid cooling section 32 are the same. The connecting section 33 is an arc-shaped bending structure. If the bending radius of the connecting section 33 is too small, cracks will appear and the pipe will be flattened. The bending radius of the connecting section 33 can be set to 5 times the pipe diameter of the liquid cooling pipe 30.

[0053] It can be understood that compared with the prior art in which multiple bending structures are provided on the liquid cooling pipe 30, in this application, a connecting section 33 is provided to be bent and connected between the first liquid cooling section 31 and the second liquid cooling section 32. On the basis of ensuring the liquid cooling effect, the structure is simplified. When the coolant changes the flow direction, the connecting section 33 can avoid coolant blockage and improve the flow efficiency of the coolant.

[0054] In some embodiments, the box body assembly 100 includes two liquid cooling joint groups 20 and two liquid cooling pipes 30. Each liquid cooling pipe 30 is provided corresponding to a liquid cooling joint group 20. One liquid cooling pipe 30 is used to input the coolant, and the other liquid cooling pipe 30 is used to output the coolant.

[0055] Specifically, one end of each liquid cooling pipe 30 is connected to the first liquid cooling joint 21, and the other end is connected to the second liquid cooling joint 22. A liquid cooling joint group 20 and a liquid cooling pipe 30 form a liquid cooling pipe assembly. The box body assembly 100 includes two liquid cooling pipe assemblies, which are respectively arranged on both sides of the central axis in the length direction of the front panel 13. One group of liquid cooling pipe assemblies is used to input the coolant, and the other group of liquid cooling pipe assemblies is used to output the coolant.

[0056] In some embodiments, the liquid cooling pipe 30 further includes a connecting section 33. One end of the connecting section 33 is connected to the first liquid cooling section 31, and the other end is connected to the second liquid cooling section 32. The bending radius of the connecting section 33 is R1, and the length of D1 is not less than the length of R1.

[0057] Specifically, if D1 is too short, it is not convenient for the external liquid cooling pipe 30 to be connected to the second liquid cooling pipe 30. The length of D1 should not be less than the bending radius R1 of the liquid cooling pipe 30. When the length of D1 is close to the bending radius R1 of the liquid cooling pipe 30, the length of D1 is the smallest and the length of D2 is the largest. The second liquid cooling joint 22 is farther from the outside of the box body 10. At this time, when connecting to the external liquid cooling pipe 30 provided on the vehicle, a larger pipe bending radius of the external liquid cooling pipe 30 can be tolerated. The specific values of D1 and R1 in this application are not limited and can be set according to the actual length of the front panel 13.

[0058] In some embodiments, the first liquid cooling section 31, the second liquid cooling section 32, and the connecting section 33 are of an integrally formed structure. The integrally formed structure does not require independent manufacturing of each part and subsequent assembly steps, which can reduce the number of pipe components of the liquid cooling pipe 30 and the assembly process, thereby simplifying the production process. In addition, since the overall components of the liquid cooling pipe 30 are connected by an integrally formed method, this continuity and seamlessness can reduce the weaknesses or fatigue problems that may occur at the connection points and can provide higher structural strength and rigidity.

[0059] In some embodiments, one end of each first liquid cooling joint 21 is connected to the first cooling plate 11, and the other end of the first liquid cooling joint 21 extends along the first direction and is connected to the first liquid cooling section 31. One end of the first liquid cooling section 31 is connected to the first liquid cooling joint 21 and is arranged towards the second cooling plate 12 along the first direction. During the flow of the first liquid cooling section 31, the flow direction of the coolant does not change.

[0060] In some embodiments, the first liquid cooling joint 21 is connected to the first cooling plate 11 by welding. In addition, it can also be connected by riveting, screwing, etc. The specific connection method is not limited in this application.

[0061] In some embodiments, the second cooling plate 12 is provided with a plurality of liquid cooling channels 40 penetrating along a third direction. An opening communicating with the liquid cooling channels 40 is formed at each end of the second cooling plate 12. The plurality of liquid cooling channels 40 are arranged along a second direction. The box body assembly 100 includes two liquid cooling plugs 50, and each liquid cooling plug 50 seals an opening. Along the second direction, the second cooling plate 12 is provided with an opening communicating with the second liquid cooling joint 22, and the opening communicates with the liquid cooling channels. The third direction is perpendicular to the first direction and the second direction.

[0062] Specifically, the first direction and the second direction are perpendicular to each other in the same plane, the third direction is perpendicular to the first direction and perpendicular to the second direction. The third direction may be the length direction of the second cooling plate 12, that is, the length direction of the box body assembly 100. The channels penetrating along the third direction can facilitate the processing of the channels, enabling the coolant to flow along the liquid cooling channels 40 in the second cooling plate 12. The liquid cooling channels 40 are arranged along the second direction, that is, the number of liquid cooling channels 40 gradually increases along the second direction. The openings of the second cooling plate 12 extend along the second direction of the second cooling plate 12 and communicate with a plurality of liquid cooling channels 40. The liquid cooling plugs 50 have sealing performance, and each liquid cooling plug 50 is used to seal the openings at both ends of the liquid cooling channels 40 to prevent liquid leakage and maintain the integrity of the liquid cooling system.

[0063] Please refer to Figure 5 , Figure 5 is an exploded view of the box body assembly provided by the embodiment of the present utility model. Figure 2 In some embodiments, the second cooling plate 12 includes a main board 122 and sub-boards 123 provided on both sides of the main board 122. The sub-boards 123 are also provided with liquid cooling channels 40. After the sub-boards 123 and the main board 122 are installed, the liquid cooling channels 40 in the sub-boards 123 communicate with the liquid cooling channels 40 in the main board 122. The openings of the second cooling plate 12 communicate with the liquid cooling channels 40 in the sub-boards 123 and are connected to the liquid cooling channels 40 in the main board 122. The box body assembly 100 further includes side plates 14 oppositely arranged along the second direction, and each side plate 14 is vertically connected to a sub-board 123, and each sub-board 123 and each side plate 14 form an L-shaped structure.

[0064] The present application also provides a battery pack (not shown in the figure). The battery pack includes a battery module and the box body assembly 100 as described above. The first cooling plate 11 covers the box body 10 to form an accommodation chamber, the battery module is arranged in the accommodation chamber, and the second cooling plate 12 is located at the bottom of the battery module.

[0065] The above has introduced the embodiments of the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A box assembly for accommodating a battery module, characterized in that, Comprising: A box body, including a first cooling plate and a second cooling plate arranged oppositely, and a front panel connected between the first cooling plate and the second cooling plate, the front panel including oppositely arranged side edges; A liquid cooling joint group, including a first liquid cooling joint and a second liquid cooling joint, the first liquid cooling joint being connected to the first cooling plate; The second liquid cooling joint includes a first transfer section, a second transfer section and a third transfer section, the first transfer section being connected to the second cooling plate, the second transfer section and the third transfer section both being connected to the first transfer section, the second transfer section being used for connecting an external liquid cooling structure, the third transfer section and the second transfer section extending in mutually opposite directions and being communicated with the first liquid cooling joint, the distance between the orthographic projection of the first liquid cooling joint on the plane where the second cooling plate is located and the orthographic projection of the first transfer section on the plane where the second cooling plate is located being D1, the distance from the first transfer section to the side edge being D2, and D2 being greater than D1.

2. The cabinet assembly according to claim 1, wherein, The first cooling plate includes a first protruding portion protruding from the front panel, and the first liquid cooling joint is connected to the first protruding portion.

3. The box assembly according to any one of claims 1 or 2, characterized in that The second cooling plate includes a second protruding portion protruding from the front panel, and the first transfer section is connected to the second protruding portion.

4. The cabinet assembly according to claim 1, wherein The box body assembly further includes a liquid cooling pipe, the liquid cooling pipe including a first liquid cooling section, a connecting section and a second liquid cooling section connected in sequence, the first liquid cooling section extending and connecting along a first direction and being connected to the first liquid cooling joint, the second liquid cooling section extending along a second direction and being connected to the second liquid cooling joint, the first direction and the second direction being different, and the connecting section being bent and connected between the first liquid cooling section and the second liquid cooling section.

5. The cabinet assembly according to claim 4, characterized in that, The box body assembly includes two of the liquid cooling joint groups and two of the liquid cooling pipes, each liquid cooling pipe being correspondingly arranged for one liquid cooling joint group, one of the liquid cooling pipes being used for inputting coolant, and the other liquid cooling pipe being used for outputting coolant.

6. The cabinet assembly according to claim 4, wherein, The bending radius of the connecting section is R1, and the length of D1 is not less than the length of R1.

7. The cabinet assembly according to claim 4, wherein The first liquid cooling section, the second liquid cooling section and the connecting section are of an integrally formed structure.

8. The cabinet assembly according to claim 4, wherein A plurality of liquid cooling channels are provided in the second cooling plate and penetrate through in a third direction, openings communicating with the liquid cooling channels are respectively formed at both ends of the second cooling plate, the plurality of liquid cooling channels are arranged along the second direction, the box body assembly includes two liquid cooling plug strips, and each liquid cooling plug strip plugs one of the openings, the third direction being perpendicular to the first direction and the second direction.

9. The box assembly according to claim 1, wherein The second cooling plate includes a main board and sub-boards arranged on both sides of the main board, the box body assembly further includes side boards oppositely arranged along the second direction, and each side board is vertically connected to one sub-board.

10. A battery pack, characterized in that, Including A battery module; The box body assembly according to any one of claims 1-9, the first cooling plate covers the box body to form an accommodation chamber, the battery module is arranged in the accommodation chamber, and the second cooling plate is located at the bottom of the battery module.

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