Case assembly and battery pack

Abstract

The present application provides a case assembly and a battery pack. The case assembly comprises a case and liquid cooling connector groups; each liquid cooling connector group comprises a first liquid cooling connector and a second liquid cooling connector; the second liquid cooling connector comprises a first adapter section, a second adapter section, and a third adapter section; the distance between the orthographic projections of the first liquid cooling connector and the first adapter section on a plane where a second cooling plate is located is D1, the distance from the first adapter section to a side edge is D2, and D2 is greater than D1, so as to save space and costs of a front plate.

Description

Battery pack and box assembly

[0001] This application claims priority to Chinese patent application No. 202421756566.2 filed on July 23, 2024 and No. 202421847827.1 filed on July 31, 2024 with the Chinese Patent Office, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack and a box assembly. BACKGROUND

[0003] In the related art, a battery pack is used to mount battery modules in a vehicle. When the battery operates at high power, a large amount of heat is generated by the battery. In order to ensure the temperature consistency in the battery pack and avoid the impact of excessive heat on the service life and performance of the battery, or cause thermal runaway of the battery pack, a cooling system is arranged in the battery pack to cool the battery modules. The cooling system is connected by a cooling liquid delivery pipeline, and the cooling liquid delivery pipeline is further connected to a cooling liquid delivery pump and other devices. SUMMARY

[0004] The cooling channel and the cooling liquid delivery pipeline are connected through a water cooling connector. The existing cooling liquid delivery pipeline is not reasonably arranged, which increases the cost of the pipeline.

[0005] The present application provides a box assembly, which comprises:

[0006] A box comprising a first cooling plate and a second cooling plate arranged opposite to each other, and a first side plate connected between the first cooling plate and the second cooling plate, wherein the first side plate comprises side edges arranged opposite to each other;

[0007] A liquid cooling connector set comprising a first liquid cooling connector and a second liquid cooling connector, wherein the first liquid cooling connector is connected to the first cooling plate;

[0008] The second liquid cooling connector comprises a first adapter section, a second adapter section and a third adapter section, the first adapter section is connected to the second cooling plate, the second adapter section and the third adapter section are both connected to the first adapter section, the second adapter section is used to connect an external liquid cooling structure, the third adapter section and the second adapter section are arranged in directions away from each other and are in communication with the first liquid cooling connector, the distance between the first liquid cooling connector and the first adapter section in the projection plane of the second cooling plate is D1, the distance from the first adapter section to the side edge is D2, and D2 is greater than D1.

[0009] The application also provides a battery pack, comprising a battery module and the aforementioned box assembly, a box of the box assembly forms a mounting space, the battery module is arranged in the mounting space, and the second cooling plate is located at the bottom of the battery module. Advantages

[0010] The application provides a box assembly, comprising a first liquid cooling connector and a second liquid cooling connector, a distance between a projection of the first liquid cooling connector on a plane where the second cooling plate is located and a projection of the first adapter segment on the plane where the second cooling plate is located is D1, a distance from the first adapter segment to the side edge is D2, and the D2 is greater than the D1. Compared with the prior art, the distance between the second liquid cooling connector and the external frame is greater than the distance between the first liquid cooling connector and the second liquid cooling connector, so as to save the space of the first side plate and the cost. Meanwhile, when connected to the vehicle, a greater bending radius of a liquid cooling pipeline of the external liquid cooling pipe can be allowed, and the space utilization rate is improved.

[0011] The battery pack provided by the application adopts the aforementioned box assembly, and the manufacturing cost of the battery pack can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is a front view of the box assembly provided by the embodiment of the application;

[0013] Fig. 2 is an exploded view I of the box assembly provided by the embodiment of the application;

[0014] Fig. 3 is a structural schematic view I of the box assembly provided by the embodiment of the application;

[0015] Fig. 4 is an enlarged schematic view of a partial A of the embodiment shown in Fig. 3;

[0016] Fig. 5 is an exploded view II of the box assembly provided by the embodiment of the application.

[0017] Fig. 6 is a structural schematic view of one embodiment of the box provided by the embodiment of the application;

[0018] Fig. 7 is an exploded structural schematic view of one embodiment of the box provided by the embodiment of the application;

[0019] Fig. 8 is an enlarged view of a partial B of the embodiment shown in Fig. 7;

[0020] Fig. 9 is a sectional view along the direction of A-A in Fig. 6;

[0021] Fig. 10 is a front view of one embodiment of the box provided by the embodiment of the application, in which the sealing member is not shown.

[0022] Explanation of reference signs:

[0023] 100, box assembly; 1001, mounting space;

[0024] 10, box; 11, first cooling plate; 110, box component; 111, first protrusion; 12, second cooling plate; 121, second protrusion; 112, sub-plate; 120, main plate; 130, sealing member; 140, first side plate; 141, second side plate;

[0025] 20, liquid cooling connector set; 21, first liquid cooling connector; 22, second liquid cooling connector; 221, first adapter section; 222, second adapter section; 223, third adapter section;

[0026] 30, liquid cooling pipe; 31, first liquid cooling section; 32, second liquid cooling section; 33, connecting section;

[0027] 40, liquid cooling flow channel; 1120, first liquid cooling passage; 1121, first sub-flow channel; 1122, first opening; 1210, second liquid cooling passage; 1211, second sub-flow channel; 1212, second opening; 1213, second notch; 1214, second communication hole; 1215, second partition plate; 1216, second interval; 1128, mounting surface. Embodiments of the present application

[0028] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0031] Please refer to Figures 1-3. Figure 1 is a front view of the enclosure assembly provided in an embodiment of this application, Figure 2 is an exploded view of the enclosure assembly provided in an embodiment of this application, and Figure 3 is a structural schematic diagram of the enclosure assembly provided in an embodiment of this application. This application provides an enclosure assembly 100, which includes an enclosure 10 and a liquid cooling connector assembly 20. The enclosure 10 includes a first cooling plate 11 and a second cooling plate 12 disposed opposite to each other, and a first side plate 140 connected between the first cooling plate 11 and the second cooling plate 12. The first side plate 140 includes oppositely disposed sides and is vertically disposed between the first cooling plate 11 and the second cooling plate 12, that is, one end of the first side plate 140 is vertically connected to the first cooling plate 11, and the other end is vertically connected to the second cooling plate 12.

[0032] The liquid cooling connector assembly 20 includes a first liquid cooling connector 21 and a second liquid cooling connector 22. The first liquid cooling connector 21 is connected to the first cooling plate 11 and is arranged along a first direction. The second liquid cooling connector 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 housing assembly 100, and the second direction can be the width direction of the housing assembly 100.

[0033] Please refer to Figure 4, which is an enlarged schematic diagram of part A of the embodiment in Figure 3. In some embodiments, the second liquid cooling connector 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 the second adapter section 222 and the third adapter section 223 are both connected to the first adapter section 221. The second adapter section 222 is used to connect to an external liquid cooling structure, and the third adapter section 223 is connected to the second liquid cooling section 32.

[0034] In some embodiments, the first adapter segment 221 extends along a first direction, and the second adapter segment 222 and the third adapter segment 223 extend along a second direction, extending in opposite directions and communicating with the first liquid cooling connector 21. The distance between the orthographic projection of the first liquid cooling connector 21 onto the plane of the second cooling plate 12 and the orthographic projection of the first adapter segment 221 onto the plane of the second cooling plate 12 is D1, and the distance from the first adapter segment 221 to the side is D2, where D2 is greater than D1.

[0035] The second transition section 222 and the third transition section 223 are set at the same height from the second cooling plate 12. The coolant entering through the second transition section 222 enters the second cooling plate 12 through the first transition section 221, and enters the second liquid cooling section 32 through the third transition section 223, and then enters the first cooling plate 11 through the first liquid cooling section 31.

[0036] In some embodiments, the second liquid cooling connector 22 is connected to the second cooling plate 12 by welding. Alternatively, it can be connected by riveting, screwing, or other methods; this application does not limit the specific connection method.

[0037] Specifically, the traditional liquid cooling system design, with its longer D1 length, results in a longer distance between the liquid cooling connectors on the two cooling plates, increasing the cost of the piping in the liquid cooling system and occupying more space in the first side panel 140. Compared to existing technologies, the distance between the second liquid cooling connector 22 and the external frame is greater than the distance between the first liquid cooling connector 21 and the second liquid cooling connector 22, saving front panel space and cost. Simultaneously, when connected to the vehicle, it allows for a larger bending radius of the external liquid cooling pipes, improving space utilization.

[0038] In some embodiments, the first cooling plate 11 includes a first protrusion 111, which protrudes from the first side plate 140, and the first liquid cooling connector 21 is connected to the first protrusion 111.

[0039] In some embodiments, the second cooling plate 12 includes a second protrusion 121, which protrudes from the first side plate 140, and a first transition section 221 is connected to the second protrusion 121.

[0040] Understandably, placing the liquid cooling pipe 30 outside the first side plate 140 can prevent the liquid cooling pipe 30 and the liquid cooling connector group 20 from occupying the internal space of the battery box 10, thus expanding the internal space of the battery box 10. At the same time, even if a leak occurs at the first liquid cooling connector 21 or the second liquid cooling connector 22, the coolant will not enter the interior of the battery box 10, thereby improving battery safety.

[0041] In some embodiments, the second liquid cooling connector 22 and the first liquid cooling connector 21 are misaligned in their orthographic projections onto the plane where the second cooling plate 12 is located. It is understood that in the first direction, the misalignment of the first liquid cooling connector 21 and the second liquid cooling connector 22 means that the first liquid cooling connector 21 and the second liquid cooling connector 22 are not on the same straight line, and their orthographic projections onto the plane where the second cooling plate 12 is located do not coincide.

[0042] In some examples, the first protrusion 111 is located in the middle of the first cooling plate 11, and the length of the second protrusion 121 is equal to the length of the second cooling plate 12. The first liquid cooling connector 21 is close to the central axis in the length direction of the first side plate 140, the second liquid cooling connector 22 is away from the central axis in the length direction of the first side plate 140, and the second liquid cooling section 32 is close to the second cooling plate 12 and extends away from the central axis in the length direction of the first side plate 140.

[0043] In some examples, the length of the first protrusion 111 is equal to the length of the first cooling plate 11, and the second protrusion 121 is located in the middle of the second cooling plate 12. The second liquid cooling connector 22 is close to the central axis in the length direction of the first side plate 140, the first liquid cooling connector 21 is away from the central axis in the length direction of the first side plate 140, and the second liquid cooling section 32 is close to the first cooling plate 11 and extends away from the central axis in the length direction of the first side plate 140.

[0044] In some embodiments, the housing assembly 100 further includes a liquid cooling pipe 30, which includes a first liquid cooling section 31, a connecting section 33, and a second liquid cooling section 32 connected in sequence. The first liquid cooling section 31 extends along a first direction and is connected to a first liquid cooling connector 21, the second liquid cooling section 32 extends along a second direction and is connected to a second liquid cooling connector 22, and the connecting section 33 is bent and connected between the first liquid cooling section 31 and the second liquid cooling section 32.

[0045] 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 has an arc-shaped bend 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 diameter of the liquid cooling pipe 30.

[0046] Understandably, compared to the existing technology which sets multiple bends on the liquid cooling pipe 30, this application sets a connecting section 33 that bends and connects between the first liquid cooling section 31 and the second liquid cooling section 32. This simplifies the structure while ensuring the liquid cooling effect. When the coolant changes its flow direction, the connecting section 33 can avoid coolant stagnation and improve the flow efficiency of the coolant.

[0047] In some embodiments, the housing assembly 100 includes two liquid cooling connector groups 20 and two liquid cooling pipes 30, each liquid cooling pipe 30 being provided with a corresponding liquid cooling connector group 20, one liquid cooling pipe 30 being used for inputting coolant and the other liquid cooling pipe 30 being used for outputting coolant.

[0048] Specifically, one end of each liquid cooling pipe 30 is connected to the first liquid cooling connector 21, and the other end is connected to the second liquid cooling connector 22. A liquid cooling connector group 20 and a liquid cooling pipe 30 constitute a liquid cooling pipe assembly. The housing assembly 100 includes two liquid cooling pipe assemblies. The two liquid cooling pipe assemblies are respectively arranged on both sides of the central axis in the length direction of the first side plate 140. One set of liquid cooling pipe assemblies is used for inputting coolant, and the other set of liquid cooling pipe assemblies is used for outputting coolant.

[0049] In some embodiments, the liquid cooling pipe 30 further includes a connecting section 33, one end of which 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.

[0050] Specifically, if D1 is too short, it will be inconvenient to connect the external liquid cooling pipe 30 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 minimum, and the length of D2 is the maximum. The second liquid cooling connector 22 is further away from the outside of the housing 10. At this time, it can be connected to the external liquid cooling pipe 30 installed on the vehicle, which can allow for a larger pipe bending radius of the external liquid cooling pipe 30. This application does not limit the specific values ​​of D1 and R1, and they can be set according to the actual length of the first side plate 140.

[0051] In some embodiments, the first liquid-cooled section 31, the second liquid-cooled section 32, and the connecting section 33 are integrally molded structures. This integral molding structure eliminates the need for independent manufacturing of each part and subsequent assembly steps, reducing the number of pipe components in the liquid-cooled pipe 30 and simplifying the assembly process. Furthermore, since the liquid-cooled pipe 30 is connected as a single unit, this continuity and seamlessness reduce potential weaknesses or fatigue at the joints, providing higher structural strength and rigidity.

[0052] In some embodiments, one end of each first liquid cooling connector 21 is connected to the first cooling plate 11, and the other end of the first liquid cooling connector 21 extends along a 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 connector 21 and is disposed towards the second cooling plate 12 along the first direction. During the flow in the first liquid cooling section 31, the coolant does not change its flow direction.

[0053] In some embodiments, the first liquid cooling connector 21 is connected to the first cooling plate 11 by welding. Alternatively, it can be connected by riveting, screwing, or other methods; this application does not limit the specific connection method.

[0054] In some embodiments, the second cooling plate 12 is provided with a plurality of liquid cooling channels 40 that are arranged in a third direction. The two ends of the second cooling plate 12 are respectively formed with an opening communicating with the liquid cooling channels 40. The plurality of liquid cooling channels 40 are arranged in a second direction. The housing assembly 100 includes two sealing members 130, each sealing member 130 blocking an opening. In the second direction, the second cooling plate 12 has an opening communicating with the second liquid cooling connector 22. The opening communicates with the liquid cooling channels. The third direction is perpendicular to the first direction and the second direction.

[0055] Specifically, the first and second directions are perpendicular to each other in the same plane, and a third direction is perpendicular to both the first and second directions. This third direction can be the length direction of the second cooling plate 12, i.e., the length direction of the housing assembly 100. The flow channel is arranged through the third direction to facilitate its processing, allowing the coolant to flow along the liquid cooling channel 40 within the second cooling plate 12. The liquid cooling channels 40 are arranged along the second direction, meaning the number of liquid cooling channels 40 gradually increases along the second direction. The opening of the second cooling plate 12 extends along the second direction of the second cooling plate 12 and connects multiple liquid cooling channels 40. The sealing element 130 has sealing properties; each sealing element 130 is used to seal the openings at both ends of the liquid cooling channel 40 to prevent liquid leakage and maintain the integrity of the liquid cooling system.

[0056] Please refer to Figure 5, which is an exploded view of the housing assembly provided in an embodiment of this application. In some embodiments, the second cooling plate 12 includes a main plate 120 and sub-plates 112 disposed on both sides of the main plate 120. Sub-plates 112 also have liquid cooling channels 40. After the sub-plates 112 and the main plate 120 are installed, the liquid cooling channels 40 in the sub-plates 112 are connected to the liquid cooling channels 40 in the main plate 120. The opening of the second cooling plate 12 communicates with the liquid cooling channels 40 in the sub-plates 112 and is also connected to the liquid cooling channels 40 in the main plate 120. The housing assembly 100 also includes second side plates 141 disposed opposite each other along a second direction. Each second side plate 141 is vertically connected to a sub-plate 112, and each sub-plate 112 and each second side plate 141 form an L-shaped structure.

[0057] Figure 6 is a structural schematic diagram of an embodiment of the battery pack housing provided in this application. Figure 7 is an exploded structural schematic diagram of an embodiment of the battery pack housing provided in this application. As shown in Figures 6 and 7, the housing assembly 100 includes two housing parts 110 and a main board 120. The housing parts 110 include an integrally connected second side plate 141 and a sub-plate 112. Thus, the housing parts 110 can be formed by extruding a profile. Specifically, the housing parts 110 can be formed by extruding a profile with a cavity using a profile mold. The material of the profile can be aluminum or other metals, and is not limited here.

[0058] The second side plates 141 of the two housing components 110 are spaced apart from each other along a second direction, forming an installation space 1001 for mounting a battery module (not shown in the figure). A first liquid cooling channel 1120 is provided within the sub-plate 112 of the housing component 110. The two sub-plates 112 are located on the same side of the installation space 1001 along the first direction, which forms an angle with the second direction. The angle formed by the second direction and the first direction can be a right angle or an acute angle, depending on the structure of the electromagnetic enclosure.

[0059] In addition, the motherboard 120 is soldered between two sub-boards 112. One side of the motherboard 120 faces the mounting space 1001. The motherboard 120 is provided with a second liquid cooling channel 1210 that communicates with the first liquid cooling channel 1120. This makes the motherboard 120 and the two sub-boards 112 located on the same side of the mounting space 1001, and one side of the motherboard 120 and the two sub-boards 112 respectively face the mounting space 1001, so that the sub-boards 112 and the motherboard 120 can dissipate heat from the battery module in the mounting space 1001.

[0060] In this embodiment, a main board 120 is welded between the sub-boards 112 of two housing components 110, with one side of the main board 120 facing the mounting space 1001 between the second side plates 141 of the two housing components 110. The second liquid cooling channel 1210 of the main board 120 is connected to the first liquid cooling channel 1120 of the sub-board 112. This allows the sub-boards 112 and the main board 120 of the two housing components 110 to combine to form a wider liquid cooling plate structure. Furthermore, since the main board 120 is welded between the two sub-boards 112, the width of the sub-boards 112 along the second direction can be reduced while maintaining the overall width of the liquid cooling plate structure along the second direction. This reduces the width of the profile formed by extrusion molding of the housing component 110, which helps to reduce the difficulty and cost of extrusion molding, improves the flatness of the sub-boards 112 and side plates formed by extrusion molding, and thus improves the overall yield of the liquid cooling plate formed by welding the sub-boards 112 and the main board 120.

[0061] In some embodiments, as shown in Figures 9 and 10, a first connecting hole 1124 communicating with the first liquid cooling channel 1120 can be formed on the side of the sub-board 112 facing the main board 120, and second connecting holes 1214 communicating with the second liquid cooling channel 1210 can be formed on both sides of the main board 120 along the second direction. When the two sub-boards 112 are soldered to the main board 120 respectively, the first connecting holes 1124 and the two second connecting holes 1214 of the two sub-boards 112 are connected in a one-to-one correspondence, so that the first liquid cooling channel 1120 of the two sub-boards 112 is connected to the second liquid cooling channel 1210 respectively.

[0062] Therefore, when welding the sub-board 112 to the main board 120, the first connecting hole 1124 of the sub-board 112 can be aligned with the corresponding second connecting hole 1214 on the main board 120, thereby realizing the connection between the first liquid cooling channel 1120 and the second liquid cooling channel 1210 of the sub-board 112. This operation is very convenient and helps to improve the processing efficiency of the housing assembly 100.

[0063] Specifically, the first connecting hole 1124 of the daughter board 112 can be located at one end of the daughter board 112 along the third direction Z, and the second direction and the first direction are respectively set at an angle to the third direction Z. Correspondingly, the second connecting hole 1214 of the motherboard 120 is located at one end of the motherboard 120 along the third direction Z, so that the first connecting hole 1124 of the daughter board 112 can be aligned and connected with the corresponding second connecting hole 1214 on the motherboard 120.

[0064] Of course, the first connecting hole 1124 of the sub-board 112 can also be located in the middle of the sub-board 112 along the third direction Z, or the first connecting hole 1124 of the sub-board 112 can be kept at a certain distance from the end of the sub-board 112 along the third direction Z. Correspondingly, the second connecting hole 1214 of the motherboard 120 is located in the middle of the motherboard 120 along the third direction Z, or the second connecting hole 1214 of the motherboard 120 can be kept at a certain distance from the end of the motherboard 120 along the third direction Z. It is only necessary to ensure that the first connecting hole 1124 of the sub-board 112 can be aligned and connected with the corresponding second connecting hole 1214 on the motherboard 120.

[0065] In some embodiments, as shown in Figures 9 and 10, the first liquid cooling channel 1120 of the sub-plate 112 may include a plurality of first sub-channels 1121, which are sequentially distributed along a second direction and extend along a third direction Z, with the second direction and the first direction forming an angle with the third direction Z. This allows for a more uniform distribution of the first liquid cooling channels 1120 on the sub-plate 112, which is beneficial for improving the heat dissipation uniformity of various parts of the sub-plate 112.

[0066] In this embodiment, at least one first sub-channel 1121 is connected to the first connecting hole 1124, thereby connecting the first liquid cooling channel 1120 to the first connecting hole 1124. In some embodiments, the first sub-channel 1121 closest to the motherboard 120 among the plurality of first sub-channels 1121 can be connected to the first connecting hole 1124, that is, the first connecting hole 1124 can be connected to the nearest first sub-channel 1121, thereby making the structure of the first liquid cooling channel 1120 of the subboard 112 simpler and easier to process.

[0067] Referring again to Figures 9 and 10, the second liquid cooling channel 1210 can include multiple second sub-channels 1211, which are sequentially distributed along the first direction and extend along a third direction Z. The second direction and the first direction are respectively set at angles to the third direction Z. This allows for a more uniform distribution of the second liquid cooling channel 1210 on the motherboard 120, which is beneficial for improving the heat dissipation uniformity of various parts of the motherboard 120.

[0068] In this embodiment, at least one second sub-channel 1211 is connected to the first liquid cooling channel 1120, thereby connecting the first liquid cooling channel 1120 and the second liquid cooling channel 1210. In some embodiments, the two second sub-channels 1211 located on both sides of the motherboard 120 along the second direction can be connected one-to-one with the two second connecting holes 1214, that is, the second connecting hole 1214 is connected to the nearest second sub-channel 1211, thereby simplifying the structure of the second liquid cooling channel 1210 of the motherboard 120 and making it easier to process.

[0069] As shown in Figure 4, the sub-board 112 has a first opening 1122 at at least one end along the third direction Z, which communicates with a plurality of first sub-channels 1121. The second direction and the first direction are respectively set at an angle to the third direction Z. The main board 120 has a second opening 1212 at the same end along the third direction Z, which communicates with a plurality of second sub-channels 1211. That is, the first opening 1122 and the second opening 1212 are located on the same side of the housing assembly 100 along the third direction Z.

[0070] In some embodiments, as shown in Figures 8 and 9, a first notch 1123 may be provided on the side of the first opening 1122 of the sub-board 112 near the motherboard 120, and a second notch 1213 may be provided on at least one side of the second opening 1212 of the motherboard 120 near the sub-board 112, so that when the sub-board 112 and the motherboard 120 are soldered together, the first notch 1123 and the second notch 1213 can be aligned and connected.

[0071] The housing assembly 100 also includes a sealing element 130 connected to the sub-board 112 and the main board 120. This sealing element 130 seals the first opening 1122 and the second opening 1212, thereby preventing coolant leakage from the first liquid cooling channel 1120 and the second liquid cooling channel 1210 through the first opening 1122 or the second opening 1212. Furthermore, the sealing element 130 and the first notch 1123 enclose a first connecting hole 1124, and the sealing element 130 and the second notch 1213 enclose a second connecting hole 1214. By forming the first connecting hole 1124 with the sealing element 130 and the second connecting hole 1213, and thus the first connecting hole 1124 and the second connecting hole 1214 are more easily processed, which helps improve the processing efficiency of the housing assembly 100.

[0072] In some embodiments, the sub-board 112 may have first openings 1122 at both ends along the third direction Z, communicating with a plurality of first sub-channels 1121. The main board 120 may have second openings 1212 at both ends along the third direction Z, communicating with a plurality of second sub-channels 1211. The housing assembly 100 includes two seals 130 connected to the sub-board 112 and the main board 120. One seal 130 seals the first opening 1122 and the second opening 1212 at one end of the sub-board 112 and the main board 120 along the third direction Z, and the other seal 130 seals the first opening 1122 and the second opening 1212 at the other end of the sub-board 112 and the main board 120 along the third direction Z.

[0073] In some embodiments, in the second direction, a plurality of first sub-channels 1121 can be connected in series sequentially. That is, the plurality of first sub-channels 1121 of the subboard 112 are connected in series sequentially in the direction away from the motherboard 120. Specifically, among three adjacent first sub-channels 1121, the end of the middle first sub-channel 1121 in the third direction Z can be connected to the end of the first sub-channel 1121 near the motherboard 120 in the third direction Z, while the other end of the middle first sub-channel 1121 in the third direction Z can be connected to the other end of the first sub-channel 1121 away from the motherboard 120 in the third direction Z, thereby connecting the plurality of first sub-channels 1121 in series sequentially in the second direction.

[0074] The sub-plate 112 may include a first partition 1125 located between two adjacent first sub-channels 1121. The first partition 1125 has a first gap 1126 at one end in the third direction Z with the seal 130, and the first sub-channels 1121 on both sides of the first partition 1125 are connected through the first gap 1126, thereby connecting the two adjacent first sub-channels 1121 at one end in the third direction Z.

[0075] Specifically, there are multiple first partitions 1125, and these multiple first partitions 1125 and multiple first sub-channels 1121 are alternately distributed along the second direction. In the direction away from the main board 120, the first partitions 1125 of the sub-board 1122 arranged in odd-numbered positions have a first gap 1126 with one of the seals 130, and the first partitions 1125 arranged in even-numbered positions abut against the seal 130. At the same time, the first partitions 1125 arranged in odd-numbered positions abut against another seal 130, and the first partitions 1125 arranged in even-numbered positions have a first gap 1126 with the seal 130, thereby connecting the multiple first sub-channels 1121 in series along the second direction.

[0076] In some embodiments, in the second direction, a plurality of second sub-channels 1211 can be connected in series sequentially. Specifically, among three adjacent second sub-channels 1211 of the motherboard 120, the middle second sub-channel 1211 can be connected at one end along the third direction Z to the other end along the third direction Z of one side second sub-channel 1211, and the other end of the middle second sub-channel 1211 along the third direction Z can be connected to the other end along the third direction Z of the other side second sub-channel 1211.

[0077] The main board 120 may include a second partition 1215 located between two adjacent second sub-channels 1211. The second partition 1215 has a second gap 1216 at one end in the third direction Z with the seal 130, and the second sub-channels 1211 on both sides of the second partition 1215 are connected through the second gap 1216, thereby connecting the two adjacent second sub-channels 1211 at one end in the third direction Z.

[0078] Specifically, there are multiple second partitions 1215, and these multiple second partitions 1215 and multiple second sub-channels 1211 are alternately distributed along a second direction. In the direction away from one of the sub-boards 112 of the main board 120, the second partitions 1215 arranged in odd-numbered positions of the main board 120 have a second interval 1216 with one of the seals 130, and the second partitions 1215 arranged in even-numbered positions abut against the seal 130. At the same time, the second partitions 1215 arranged in odd-numbered positions abut against another seal 130, and the second partitions 1215 arranged in even-numbered positions have a second interval 1216 with the seal 130, thereby connecting the multiple second sub-channels 1211 in series along the second direction.

[0079] It should be noted that both the first liquid cooling channel 1120 of the sub-board 112 and the second liquid cooling channel 1210 of the main board 120 can be configured according to the above embodiment, or only one of the first liquid cooling channel 1120 of the sub-board 112 and the second liquid cooling channel 1210 of the main board 120 can be configured according to the above embodiment, while the other adopts a different structure. For example, multiple first sub-channels 1121 of the first liquid cooling channel 1120 or multiple second sub-channels 1211 of the second liquid cooling channel 1210 can be connected in parallel.

[0080] In some embodiments, as shown in FIG10, the ratio of the sum of the widths W1 of the two sub-plates 112 in the second direction to the width W2 of the main plate 120 in the second direction can be greater than or equal to 20% and less than or equal to 50%, that is, 20%≤2W1 / W2≤50%, thereby making the sum of the widths of the sub-plates 112 and the second side plate 141 of the first housing component 110, as well as the width design of the main plate 120, more reasonable, increasing the overall width of the liquid cooling plate while making the profile width of the extruded housing component 110 moderate.

[0081] The ratio of the sum of the widths W1 of the two sub-boards 112 in the second direction to the width W2 of the main board 120 in the second direction can be 25%, 30%, 40%, etc., depending on the size of the enclosure assembly 100, and is not limited here.

[0082] In some embodiments, as shown in Figures 6 and 7, the housing assembly 100 further includes two first side plates 140 disposed opposite to each other. The two first side plates 140 are distributed along the third direction Z on both sides of the installation space 1001. The second side plate 141, the sub-plate 112 and the main plate 120 are respectively connected to the first side plates 140, thereby further improving the structural stability of the housing assembly 100.

[0083] The first side plate 140 can be connected to the second side plate 141, the sub-plate 112 and the main plate 120 by means of welding, screws or other methods, which are not limited here.

[0084] In some embodiments, as shown in Figures 6 and 7, each of the two sub-plates 112 includes a second protrusion 121. The second protrusions 121 of the two sub-plates 112 are located on the side of the same first side plate 140 away from the mounting space. One of the second protrusions 121 is equipped with a second liquid cooling connector 22, which can be a liquid inlet connector. The other second protrusion 121 is equipped with a second liquid cooling connector 22, which can be a liquid outlet connector. The second liquid cooling connector 22 of the second protrusion 121 of one sub-plate 112 communicates with the first liquid cooling channel 1120 of the sub-plate 112, and the second liquid cooling connector 22 of the second protrusion 121 of the other sub-plate 112 communicates with the first liquid cooling channel 1120 of the other sub-plate 112. By connecting the inlet connector to the outlet of the coolant supply device (not shown in the figure) and the outlet connector to the inlet of the coolant supply device, the coolant supply device can continuously circulate and supply coolant to the first liquid cooling channel 1120 of the sub-board 112 and the second liquid cooling channel 1210 of the main board 120.

[0085] The second protrusion 121 has a mounting surface 1128 on the side facing the first side plate 140. A liquid cooling connector 22 communicating with the corresponding first liquid cooling channel 1120 can be provided on the mounting surface 1128 of one of the second protrusions 121, and another second liquid cooling connector 22 communicating with the corresponding first liquid cooling channel 1120 can be provided on the mounting surface 1128 of the other second protrusion 121, so that the second liquid cooling connector 22 can be connected to the coolant supply equipment.

[0086] It should be noted that the connection between the second liquid cooling connector 22 and the corresponding first liquid cooling channel 1120 means that the second liquid cooling connector 22 located on the second protrusion 121 of one of the sub-plates 112 is connected to the first liquid cooling channel 1120 in that one sub-plate 112, and the second liquid cooling connector 22 located on the second protrusion 121 of the other sub-plate 112 is connected to the first liquid cooling channel 1120 in that other sub-plate 112.

[0087] Specifically, the first liquid cooling channel 1120 within the sub-plate 112 extends to the second protrusion 121. A mounting port communicating with the first liquid cooling channel 1120 is provided on the mounting surface 1128 of the second protrusion 121. An inlet connector 151 or an outlet connector 152 is fixedly mounted on the mounting surface 1128 corresponding to the second protrusion 121 and communicates with the mounting port of the mounting surface 1128, thereby enabling the inlet connector 151 or the outlet connector 152 to communicate with the first liquid cooling channel 1120 of the corresponding sub-plate 112.

[0088] In some embodiments, as shown in Figures 6 and 7, the sub-board 112 can be a flat plate structure to facilitate better contact between the sub-board 112 and the battery module within the mounting space 1001, thereby improving the heat dissipation effect on the battery module. Simultaneously, it also makes the arrangement of the first liquid cooling channel 1120 within the sub-board 112 more convenient, which is beneficial for improving the production efficiency of the sub-board 112.

[0089] Similarly, the motherboard 120 can be designed as a flat structure to facilitate better contact between the motherboard 120 and the battery module within the mounting space 1001, thereby improving heat dissipation for the battery module. This also makes the installation of the second liquid cooling channel 1210 within the motherboard 120 easier, which is beneficial for improving the production efficiency of the motherboard 120.

[0090] It should be noted that both the sub-board 112 and the main board 120 can be flat, or only one of the sub-board 112 and the main board 120 can be flat. The specific choice depends on the structure of the battery pack, and there is no restriction here.

[0091] This application also provides a battery pack, which includes a housing assembly 100. The specific structure of the housing assembly 100 is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0092] The battery pack includes a housing assembly 100 and battery modules, with the battery modules installed within the mounting space 1001 of the housing assembly 100. The structure of the battery pack housing can refer to any of the above embodiments. The battery pack provided in this application embodiment can be used in vehicles, energy storage systems, etc., and will not be elaborated further here.

Claims

1. A box assembly (100) for accommodating a battery module, comprising: a box (10) comprising a first cooling plate (11) and a second cooling plate (12) oppositely arranged, and a first side plate (140) connected between the first cooling plate (11) and the second cooling plate (12), the first side plate (140) comprising side edges oppositely arranged; a liquid cooling connector group (20) comprising a first liquid cooling connector (21) and a second liquid cooling connector (22), the first liquid cooling connector (21) being connected to the first cooling plate (11); the second liquid cooling connector (22) comprising a first adapter section (221), a second adapter section (222) and a third adapter section (223), the first adapter section (221) being connected to the second cooling plate (12), the second adapter section (222) and the third adapter section (223) both being connected to the first adapter section (221), the second adapter section (222) being configured to connect to an external liquid cooling structure, the third adapter section (223) and the second adapter section (222) extending in directions away from each other and being in communication with the first liquid cooling connector (21), a distance between a projection of the first liquid cooling connector (21) on a plane of the second cooling plate (12) and a projection of the first adapter section (221) on the plane of the second cooling plate (12) being D1, a distance from the first adapter section (221) to the side edges being D2, the D2 being greater than the D1.

2. The box assembly (100) of claim 1, wherein, the first cooling plate (11) comprising a first protruding portion (111) protruding from the first side plate (140), the first liquid cooling connector (21) being connected to the first protruding portion (111).

3. The box assembly (100) according to any one of claims 1 or 2, wherein, the second cooling plate (12) comprising a second protruding portion (121) protruding from the first side plate (140), the first adapter section (221) being connected to the second protruding portion (121).

4. The box assembly (100) of claim 1, wherein, the box assembly (100) further comprising a liquid cooling pipe (30), the liquid cooling pipe (30) comprising a first liquid cooling section (31), a connecting section (33) and a second liquid cooling section (32) connected in sequence, the first liquid cooling section (31) extending in a first direction and being connected to the first liquid cooling connector (21), the second liquid cooling section (32) extending in a second direction and being connected to the second liquid cooling connector (22), the first direction being different from the second direction, the connecting section (33) being bent and connected between the first liquid cooling section (31) and the second liquid cooling section (32). 5.The box assembly (100) of claim 4, comprising two liquid cooling connector groups (20) and two liquid cooling pipes (30), each liquid cooling pipe (30) corresponding to one liquid cooling connector group (20), one liquid cooling pipe (30) being configured to input cooling liquid, and the other liquid cooling pipe (30) being configured to output cooling liquid.

6. The box assembly (100) of claim 4, wherein, a bending radius of the connecting section (33) being R1, a length of the D1 being not less than a length of the R1.

7. The box assembly (100) of claim 4, wherein, the first liquid cooling section (31), the second liquid cooling section (32) and the connecting section (33) being integrally formed.

8. The box assembly (100) according to claim 1, comprising: two box components (110) comprising integrally connected second side plates (141) and sub-plates (112), the two second side plates (141) being oppositely spaced apart along a second direction and forming a mounting space (1001) for mounting a battery module, the liquid cooling flow channel (40) comprising first liquid cooling channels (1120) and second liquid cooling channels (1210), the first liquid cooling channels (1120) being provided in the sub-plates (112), the two sub-plates (112) being located on the same side of the mounting space (1001) along a first direction, the second direction being arranged at an angle with the first direction; a main plate (120) welded between the two sub-plates (112), one side of the main plate (120) facing the mounting space (1001), the main plate (120) being provided with the second liquid cooling channels (1210) communicating with the first liquid cooling channels (1120).

9. The box assembly (100) of claim 8, wherein, The side of the sub-plate (112) facing the main plate (120) is provided with first communication holes (1124) communicating with the first liquid cooling channels (1120), and the two sides of the main plate (120) along the second direction are respectively provided with second communication holes (1214) communicating with the second liquid cooling channels (1210), the first communication holes (1124) of the two sub-plates (112) and the second communication holes (1214) one-to-one correspond to each other to communicate, so that the first liquid cooling channels (1120) of the two sub-plates (112) respectively communicate with the second liquid cooling channels (1210).

10. The box assembly (100) of claim 9, wherein, The first communication holes (1124) are located at one end of the sub-plate (112) along a third direction, and the second direction and the first direction are arranged at an angle with the third direction.

11. The box assembly (100) of claim 9, wherein, The first liquid cooling channels comprise a plurality of first sub-flow channels (1121), the plurality of first sub-flow channels (1121) are sequentially distributed along the second direction, and the plurality of first sub-flow channels (1121) respectively extend along a third direction, the first sub-flow channels close to the main plate (120) communicate with the first communication holes (1124), and the second direction and the first direction are arranged at an angle with the third direction; and / or, The second liquid cooling channels (1210) comprise a plurality of second sub-flow channels (1211), the plurality of second sub-flow channels (1211) are sequentially distributed along the first direction, and the plurality of second sub-flow channels (1211) respectively extend along a third direction, two second sub-flow channels (1211) located on the two sides of the main plate (120) along the second direction one-to-one correspond to the two second communication holes (1214), and the second direction and the first direction are arranged at an angle with the third direction.

12. The box assembly (100) of claim 11, wherein, The sub-plate (112) is provided with a first opening (1122) communicating with the plurality of first sub-flow channels (1121) at at least one end along the third direction, and the first opening (1122) is provided with a first notch (1123) near one side of the main plate (120); the main plate (120) is provided with a second opening (1212) communicating with the plurality of second sub-flow channels (1211) at the same end along the third direction, and the second opening (1212) is provided with a second notch (1213) near at least one side of the sub-plate (112); The box assembly (100) further comprises a sealing piece (130) connected with the sub-plate (112) and the main plate (120), the sealing piece (130) seals the first opening (1122) and the second opening (1212), the sealing piece (130) and the first notch (1123) form the first communication hole (1124), and the sealing piece (130) and the second notch (1213) form the second communication hole (1214).

13. The box assembly (100) of claim 12, wherein, The sub-plate (112) comprises a first partition plate (1125) between two adjacent first sub-flow channels (1121), and the first partition plate (1125) has a first interval (1126) with the sealing piece (130) at one end along the third direction, and the first sub-flow channels (1121) on both sides of the first partition plate (1125) are communicated through the first interval (1126); and / or, The main plate (120) further comprises a second partition plate (1215) between two adjacent second sub-flow channels (1211), and the second partition plate (1215) has a second interval (1216) with the sealing piece (130), and the second sub-flow channels (1211) on both sides of the second partition plate (1215) are communicated through the second interval (1216).

14. The box assembly (100) of any one of claims 8 to 13, wherein, The sum of the widths of the two sub-plates (112) in the second direction is greater than or equal to 20% and less than or equal to 50% of the width of the main plate (120) in the second direction.

15. The box assembly (100) of any one of claims 8 to 13, wherein, The two first side plates (140) are distributed on both sides of the mounting space (1001) along the third direction, and the second side plate (141), the sub-plate (112) and the main plate (120) are connected with the first side plate (140) respectively, and the second direction and the first direction are arranged at an angle with the third direction respectively.

16. The box assembly (100) of any one of claims 8 to 13, wherein, The sub-plate (112) is a flat plate structure; and / or, The main plate (120) is a flat plate structure.

17. A battery pack, comprising: a battery module; The box assembly (100) according to any one of claims 1-16, the box (10) forms a mounting space (1001), and the battery module is arranged in the mounting space (1001), and the second cooling plate (12) is located at the bottom of the battery module.

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