Battery box body and battery pack

Abstract

The utility model provides a battery box and a battery pack, the battery box (100) comprises a box body (11), a first liquid cooling plate (12), a second liquid cooling plate (13), a liquid inlet (14) and a liquid outlet (15), the box body (11) is internally provided with a containing cavity (111) for containing a battery module (200), and the first liquid cooling plate (12) and the second liquid cooling plate (13) are located on the two sides of the containing cavity (111) in the first direction respectively; a plurality of first flow channels (121) are distributed in the first liquid cooling plate (12), the length of each first flow channel (121) extends in the third direction, and the first liquid cooling plate (12) is provided with a plurality of first immersion holes (122) communicating with the first flow channels (121) and the containing cavity (111); a plurality of second flow channels (131) are distributed in the second liquid cooling plate (13), the length of each second flow channel (131) extends in the third direction, and the second liquid cooling plate (13) is provided with a plurality of second immersion holes (132) communicating with the second flow channels (131) and the containing cavity (111); and the liquid inlet (14) and the liquid outlet (15) are respectively communicated with the first flow channel (121) and the second flow channel (131). According to the battery box body, the probability that each battery cell is in contact with the cooling liquid can be increased, the heat exchange uniformity and effect of all the battery cells are improved, and the service life of the battery cells is prolonged.

Description

[0001] This application claims priority to Chinese Patent Application No. 202421111018.4, filed with the Chinese Patent Office on May 20, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, for example to a battery housing and a battery pack containing the battery housing. Background Technology

[0003] A battery pack typically consists of a battery casing and battery modules housed within it. Each battery module is formed by multiple cells arranged in a predetermined pattern. Heat dissipation is extremely important for battery packs, as its effectiveness directly impacts their lifespan. Currently, battery packs utilize air cooling, water cooling plates, and immersion coolant cooling. For immersion coolant cooling, the coolant is directly introduced into the battery casing to exchange heat with the cell housing. This method typically involves an inlet at one end of the battery casing along its length and an outlet at the other. Coolant is introduced through the inlet, immerses the cells, and then flows out through the outlet. The coolant cools the outside of the battery casing before being returned to the inlet, and this cycle continues to cool the battery cells within the module.

[0004] Technical issues

[0005] After the coolant enters the battery pack, the cells closer to the inlet can come into contact with more of the coolant at a lower temperature, while the cells farther away from the inlet have less contact or no contact with the coolant at a lower temperature. As a result, some cells in the battery pack are not submerged in the coolant at a lower temperature. These cells are prone to poor heat exchange, and cells with poor heat exchange will age prematurely and have reduced capacity, thereby reducing the lifespan of the battery pack.

[0006] Technical solutions

[0007] This application provides a battery housing, including a housing body, a first liquid cooling plate, a second liquid cooling plate, a liquid inlet, and a liquid outlet;

[0008] The housing body is configured with a cavity for accommodating the battery module, and the first liquid cooling plate and the second liquid cooling plate are respectively located on both sides of the cavity along the first direction;

[0009] Multiple first flow channels are distributed along the second direction inside the first liquid cooling plate. The length of each first flow channel extends along the third direction. Multiple first immersion holes are opened on one side of the first liquid cooling plate facing the cavity. Multiple first immersion holes connect multiple first flow channels and the cavity. The first immersion holes connecting the same first flow channel are spaced apart along the third direction.

[0010] Multiple second flow channels are distributed along the second direction inside the second liquid cooling plate. The length of each second flow channel extends along the third direction. Multiple second immersion holes are opened on one side of the second liquid cooling plate facing the cavity. Multiple second immersion holes connect multiple second flow channels and the cavity. The second immersion holes connecting the same second flow channel are spaced apart along the third direction. The first direction, the second direction and the third direction are arranged at an angle to each other.

[0011] The liquid outlet is connected to multiple first flow channels, and the liquid inlet is connected to multiple second flow channels.

[0012] This application also provides a battery pack, including a battery module and a battery housing, wherein the battery module is sealed and installed in the battery housing.

[0013] Beneficial effects

[0014] The beneficial effects of this application are:

[0015] By setting a first liquid cooling plate and a second liquid cooling plate on opposite sides of the receiving cavity along the first direction, the coolant enters the second flow channel through the inlet, is first diverted, and then enters the receiving cavity through the second immersion hole to perform immersion heat exchange and heat dissipation on the battery module. Since multiple second flow channels are distributed along the second direction, and the length direction of each second flow channel extends along the third direction, the second immersion hole is distributed on the entire surface of the second liquid cooling plate. The coolant entering the receiving cavity can be quickly diverted to multiple positions of the battery module, increasing the probability of each cell of the battery module contacting the coolant, improving the heat dissipation uniformity, and extending the service life of the cells. Meanwhile, the multiple first immersion holes on the first liquid cooling plate can quickly introduce the coolant that has completed heat exchange at multiple positions of the battery module into the first flow channel, and then discharge it to the outside of the battery box through the outlet, reducing the time that the high-temperature coolant stays in the receiving cavity and avoiding mixing, which would result in low heat dissipation efficiency of the battery module near the first immersion hole. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a battery box for some implementations of this application.

[0017] Figure 2 This is an exploded view of the battery housing for some implementations of this application.

[0018] Figure 3 This is a three-dimensional schematic diagram of the first liquid cooling plate for some implementations of this application.

[0019] Figure 4 This is a three-dimensional schematic diagram of the first liquid cooling plate from another perspective, representing some implementations of this application.

[0020] Figure 5 This is an exploded view of the first liquid cooling plate for some implementations of this application.

[0021] Figure 6 This is a three-dimensional schematic diagram of a second liquid cooling plate for some implementations of this application.

[0022] Figure 7 This is a three-dimensional schematic diagram of the second liquid cooling plate from another perspective, illustrating some implementations of this application.

[0023] Figure 8 This is an exploded view of the second liquid cooling plate for some implementations of this application.

[0024] Figure 9 The diagram shows a bottom view of a second liquid cooling plate (the second cover plate is not shown) for some implementations of this application.

[0025] Figure 10 This is a schematic diagram of the battery pack structure for some implementations of this application (the first liquid cooling plate is not shown).

[0026] Figure 11 This is an exploded view of a battery pack according to some implementations of this application.

[0027] Figure 12 The diagram shows a bottom view of a battery pack according to some implementations of this application (the second liquid cooling plate is not shown).

[0028] Figure 13 This is a cross-sectional schematic diagram of a battery pack according to some implementations of this application.

[0029] Figure 14 This is another cross-sectional schematic diagram of a battery pack according to some implementations of this application.

[0030] Figure 15 This is a cross-sectional schematic diagram of a shunt component for some implementations of this application.

[0031] Figure 16 This is a three-dimensional schematic diagram of a battery pack according to some implementations of this application.

[0032] Figure 17 This is another exploded schematic diagram of a battery pack according to some implementations of this application.

[0033] Figure 18 This is another cross-sectional schematic diagram of a battery pack according to some implementations of this application.

[0034] Figure 19 This is a top view of the limiting components and battery module for some implementations of this application.

[0035] Figure 20 for Figure 19 A partial schematic diagram of the middle limiting component and the battery module.

[0036] Figure 21This is a top view of the support components for some implementation methods of this application.

[0037] Figure 22 for Figure 21 A partial schematic diagram of the central support component.

[0038] Figure 23 This is another cross-sectional schematic diagram of a battery pack according to some implementations of this application.

[0039] In the picture:

[0040] 100. Battery housing; 200. Battery module; 200a. Cell assembly; 201. Cell; 202. Current guide gap;

[0041] 11. Box body; 111. Receiving cavity;

[0042] 12. First liquid cooling plate; 121. First flow channel; 122. First immersion hole; 123. First sub-collection channel; 124. First main collection channel; 125. First substrate; 126. First sealing plate;

[0043] 13. Second liquid cooling plate; 131. Second flow channel; 132. Second immersion hole; 133. Second sub-collection channel; 134. Second main collection channel; 135. Flow divider; 135a. Flow divider outer peripheral surface; 135b. Flow divider bottom surface; 135c. Flow divider top surface; 1351. Flow divider guide surface; 1352. Connecting surface; 136. Second substrate; 137. Second sealing plate; 138. Liquid inlet; 1381. Liquid inlet channel; 139. Limiting protrusion;

[0044] 14. Liquid inlet; 15. Liquid outlet; 16. Liquid inlet connector; 17. Liquid outlet connector;

[0045] 300, Battery housing; 400, Battery module; 400a, Cell assembly; 401, Cell; 402, Current guiding gap; 402a, First current guiding gap; 402b, Second current guiding gap;

[0046] 21. Box body; 211. Receiving cavity;

[0047] 22. First liquid cooling plate; 221. First flow channel; 222. First immersion hole; 225. First substrate; 226. First sealing plate;

[0048] 23. Second liquid cooling plate; 231. Second flow channel; 232. Second immersion hole; 236. Second substrate; 237. Second sealing plate;

[0049] 24. Liquid inlet; 25. Liquid outlet; 26. Liquid inlet connector; 27. Liquid outlet connector;

[0050] 28. Support component; 281. Through hole; 282. Positioning groove; 283. Support block; 283a. Flow guide channel;

[0051] 29. Limiting component; 291. Accommodating space; 291a. Cell contour surface;

[0052] 32. First liquid cooling plate;

[0053] 33. Second liquid cooling plate;

[0054] 34. Liquid inlet; 35. Liquid outlet; 36. Liquid inlet connector; 37. Liquid outlet connector;

[0055] 38. Liquid inlet; 381. Liquid inlet channel; 382. Liquid outlet channel.

[0056] Embodiments of this utility model

[0057] like Figure 1 As shown, this application embodiment provides a battery box 100. In this embodiment, the first direction is the vertical direction, the second direction is the width direction of the battery box 100, and the third direction is the length direction of the battery box 100.

[0058] like Figure 1 As shown (and refer to the appendix) Figure 10 and attached Figure 12 The following example illustrates the battery cell 201 of the battery module 200 installed in the battery box 100 as a cylindrical cell. The battery cell 201 is not limited to cylindrical cells; it can also be square, polygonal, or irregular in shape. The specific structure of the battery cell 201 is not limited, and the arrangement of the battery cell 201 can be adapted according to the specific shape of the battery cell 201. This will not be elaborated here.

[0059] In this embodiment, as Figures 1 to 9 As shown (see attached) Figures 10 to 14The battery housing 100 includes a housing body 11, a first liquid cooling plate 12, and a second liquid cooling plate 13. The housing body 11 has a receiving cavity 111 for accommodating the battery module 200. The first liquid cooling plate 12 and the second liquid cooling plate 13 are located on opposite sides of the receiving cavity 111 along a first direction. The first liquid cooling plate 12 has multiple first flow channels 121 distributed along a second direction, each first flow channel 121 extending along a third direction. The first liquid cooling plate 12 has multiple first immersion holes 122 on one side facing the receiving cavity 111. All the first immersion holes 122 connect the first flow channels 121 and the receiving cavity 111. All the first immersion holes 122 connecting the same first flow channel 121 are spaced apart along a third direction. The second liquid cooling plate 13 has multiple second flow channels 131 distributed along the second direction. The length of the second flow channel 131 extends along a third direction. The second liquid cooling plate 13 has multiple second immersion holes 132 on one side facing the cavity 111. All the second immersion holes 132 connect the second flow channel 131 and the cavity 111. All the second immersion holes 132 connecting the same second flow channel 131 are spaced apart along a third direction. The battery box 100 is also provided with a liquid inlet 14 and a liquid outlet 15. The liquid outlet 15 is connected to the first flow channel 121, and the liquid inlet 14 is connected to the second flow channel 131.

[0060] Reference Figure 14 The arrow indicates the direction of coolant flow. In this embodiment, the battery housing 100 has a first liquid cooling plate 12 and a second liquid cooling plate 13 arranged on opposite sides of the receiving cavity 111 along a first direction. After the coolant enters the second flow channel 131 through the inlet 14, it is first divided, and then enters the receiving cavity 111 through the second immersion hole 132 to perform immersion heat exchange and heat dissipation on the battery module 200. Since multiple second flow channels 131 are distributed along the second direction, and the length direction of each second flow channel 131 extends along a third direction, second immersion holes 132 are distributed across the entire surface of the second liquid cooling plate 13. The coolant in the cavity 111 can be quickly distributed to multiple locations of the battery module 200, increasing the probability that each cell 201 of the battery module 200 comes into contact with the coolant, improving heat dissipation uniformity, and extending the service life of the cell 201. Meanwhile, the multiple first immersion holes 122 on the first liquid cooling plate 12 can quickly introduce the coolant that has completed heat exchange at multiple locations of the battery module 200 into the first flow channel 121, and discharge it to the outside of the battery box 100 through the outlet 15, reducing the time that the high-temperature coolant stays in the cavity 111, and avoiding mixed flow that would result in low heat dissipation efficiency of the battery module 200 near the first immersion hole 122.

[0061] In this embodiment, the first liquid cooling plate 12 is located above the second liquid cooling plate 13. This design allows the coolant to first enter the lower second liquid cooling plate 13, and then enter the receiving cavity 111, immersing the battery cells 201 of the battery module 200 from bottom to top, dissipating heat from the cells 201. The coolant then collects through the first immersion hole 122 on the upper first liquid cooling plate 12 into the first flow channel 121 within the first liquid cooling plate 12, and is then discharged through the outlet 15. This bottom-up convection ensures that the cooling path length of the coolant flowing through each cell 201 in the battery module 200 is approximately the same. This uniform path length makes the heat dissipation effect of the cells 201 more uniform, extending the service life of the entire battery module 200. This application is not limited to placing the first liquid cooling plate 12 above the second liquid cooling plate 13; their positions can also be interchanged, i.e., the second liquid cooling plate 13 is placed above the first liquid cooling plate 12, achieving top-bottom convection, and the heat dissipation effect is the same as when the first liquid cooling plate 12 is above the second liquid cooling plate 13.

[0062] Optionally, the liquid inlet 14 and the liquid outlet 15 are located on the same side of the battery housing 100 along the first direction. By placing the liquid inlet 14 and the liquid outlet 15 on the same side of the battery housing 100 along the first direction, i.e., both on the upper or lower side of the battery housing 100, the liquid inlet 14 and the liquid outlet 15 avoid occupying the horizontal space of the battery housing 100, making the battery housing 100 more compact and increasing space utilization. Optionally, both the liquid inlet 14 and the liquid outlet 15 are located on the first liquid cooling plate 12. When both the liquid inlet 14 and the liquid outlet 15 are located on the upper surface of the battery housing 100, it facilitates the external connection and maintenance of the battery housing 100, and there is no need for a clearance structure at the bottom of the battery housing 100, making the structural design simpler. Optionally, both the liquid inlet 14 and the liquid outlet 15 are located near one end of the battery housing 100 along a third direction, which can shorten the length of the pipes inside the battery housing 100, save costs, and reduce the space occupancy rate inside the battery housing 100.

[0063] In other embodiments, the liquid inlet 14 and the liquid outlet 15 are not limited to being located on the same side of the battery housing 100, but can also be located on different sides. For example, the liquid inlet 14 can be located on the lower side of the battery housing 100, that is, the liquid inlet 14 can be located on the second liquid cooling plate 13, and the liquid outlet 15 can be located on the upper side of the battery housing 100, that is, the liquid outlet 15 can be located on the first liquid cooling plate 12. Alternatively, the liquid inlet 14 and the liquid outlet 15 can be located on the left, right, or front and rear sides of the battery housing 100.

[0064] like Figure 2 , Figure 6 , Figures 8 to 10 (in conjunction with appendix) Figure 13 and attached Figure 14The inlet 14 is connected to the second liquid cooling plate 13 via the inlet channel 1381. Since both the inlet 14 and the outlet 15 are located on the first liquid cooling plate 12, the second liquid cooling plate 13 cannot be directly connected to the inlet 14. Therefore, the inlet channel 1381 is provided as a transition to connect the inlet 14 and the second liquid cooling plate 13. Optionally, an inlet component 138 is provided in the receiving cavity 111. The inlet component 138 is connected to the first liquid cooling plate 12 and the second liquid cooling plate 13 respectively. The inlet channel 1381 is located in the inlet component 138. The inlet 14 passes through the first liquid cooling plate 12 and is connected to the inlet channel 1381. The inlet 14 is spaced apart from the first flow channel 121, and the inlet channel 1381 is connected to all the second flow channels 131. By providing a liquid inlet 138 and placing it within the receiving cavity 111, the length of the liquid inlet 138 can be minimized while ensuring communication between the liquid inlet 14 and the second flow channel 131, thus reducing the space occupied by the component. Furthermore, the shorter length of the liquid inlet 138 results in a shorter liquid inlet channel 1381, reducing the impact of the already heat-exchanged coolant within the receiving cavity 111 on the coolant within the liquid inlet channel 1381. In other embodiments, the liquid inlet 138 can also be located outside the receiving cavity 111, i.e., outside the housing body 11. This further reduces the impact of the already heat-exchanged coolant within the receiving cavity 111 on the coolant within the liquid inlet channel 1381.

[0065] Optionally, the liquid inlet 138 is fixedly connected to the second liquid cooling plate 13. This fixed connection reduces the assembly difficulty of the liquid inlet 138 and prevents it from shifting within the receiving cavity 111. Alternatively, the liquid inlet 138 and the second liquid cooling plate 13 can be integrally formed, such as by injection molding or casting. This method reduces manufacturing difficulty, and eliminates the need for additional sealing at the connection point, effectively preventing the already heated coolant in the receiving cavity 111 from entering the liquid inlet channel 1381 of the liquid inlet 138. The upper end of the liquid inlet 138 abuts against one side of the first liquid cooling plate 12 located within the receiving cavity 111. A sealing ring can be provided at the abutment position, surrounding the liquid inlet 14 to prevent coolant entering through the liquid inlet 14 from leaking into the receiving cavity 111 from the point where the liquid inlet 138 abuts against the first liquid cooling plate 12. In other embodiments, the liquid inlet 138 and the second liquid cooling plate 13 can be manufactured separately and then assembled to the second liquid cooling plate 13 by means of screws, clips, adhesives, etc.

[0066] In addition, the battery housing 100 is also equipped with a liquid inlet connector 16 and a liquid outlet connector 17. The liquid inlet connector 16 is provided corresponding to the liquid inlet 14, and the liquid outlet connector 17 is provided corresponding to the liquid outlet 15. The liquid inlet connector 16 and the liquid outlet connector 17 are used to connect to external pipes to achieve coolant circulation cooling. The liquid inlet connector 16 and the liquid outlet connector 17 can be quick-release connectors to allow for quick installation and removal of external pipes.

[0067] In one embodiment, the battery module 200 has multiple rows of battery cell groups 200a arranged along a second direction. Each row of battery cell group 200a includes multiple battery cells 201 arranged along a third direction. At least two adjacent rows of battery cell groups 200a form a flow guide gap 202, wherein each flow guide gap 202 is provided with a first flow channel 121 and a second flow channel 131. By setting the first flow channel 121 on the first liquid cooling plate 12 and the second flow channel 131 on the second liquid cooling plate 13 to correspond to the flow guide gap 202 of the battery module 200, after the coolant is introduced into the receiving cavity 111 through the second immersion hole 132 on the second flow channel 131, the coolant directly enters into multiple flow guide gaps 202, increasing the chance of each cell 201 of each row of cell group 200a contacting the coolant, avoiding low local heat exchange efficiency of the cell 201. The first immersion hole 122 on the first flow channel 121 can recover the coolant after heat exchange in the flow guide gap 202, accelerate the discharge of the coolant after heat exchange to the outside of the battery box 100, and reduce the time the coolant stays in the receiving cavity 111.

[0068] Optionally, flow guide gaps 202 are also formed between the battery module 200 and the housing body 1 on both sides along the second direction. Each flow guide gap 202 between the battery module 200 and the housing body 11 is also provided with a first flow channel 121 and a second flow channel 131 corresponding to it. This design allows the battery cells 201 on both sides of the battery module 200 along the second direction to also come into contact with the coolant at a lower temperature, ensuring uniform heat exchange of the battery cells 201 at this location.

[0069] Optionally, a plurality of first immersion holes 122 and a plurality of second immersion holes 132 are arranged in a one-to-one correspondence, that is, the number of first immersion holes 122 and second immersion holes 132 is not only the same, but the projections of the first immersion holes 122 and second immersion holes 132 along a first direction at least partially overlap. By arranging the plurality of first immersion holes 122 and a plurality of second immersion holes 132 in a one-to-one correspondence, the coolant can form a convection effect of flowing upward and downward within the guide gap 202, accelerating heat dissipation and the discharge of coolant after heat exchange, thereby improving the heat dissipation effect.

[0070] In this embodiment, the dimensions of the first immersion hole 122 and the second immersion hole 132 are the same, and their positions are directly opposite each other. This design ensures that the amount of liquid entering the receiving cavity 111 through the second immersion hole 132 and the amount of liquid exiting the receiving cavity 111 through the first immersion hole 122 are consistent, reducing the disturbance of the coolant in the receiving cavity 111 and avoiding the phenomenon of mixed flow.

[0071] Optionally, the first immersion hole 122 is a circular hole. In other embodiments, the first immersion hole 122 may also be at least one of a semi-circular hole, an elliptical hole, a square hole, a polygonal hole, and an irregular hole. For example, the first liquid cooling plate 12 may have both a circular hole and a semi-circular hole.

[0072] The second immersion hole 132 is a circular hole. In other embodiments, the second immersion hole 132 may also be at least one of a semi-circular hole, an elliptical hole, a square hole, a polygonal hole, and an irregular hole. For example, the second liquid cooling plate 13 may have both a circular hole and a semi-circular hole.

[0073] In one embodiment, such as Figure 5 As shown (the reference numerals in the attached figures follow the same pattern) Figures 1 to 4 Appendix Figures 6 to 14The first liquid cooling plate 12 is provided with a first sub-collecting channel 123 and a first main collecting channel 124. Multiple first sub-collecting channels 123 are distributed along the second direction. Each first sub-collecting channel 123 connects to at least two first flow channels 121. All first sub-collecting channels 123 are connected to the first main collecting channel 124, which is connected to the outlet 15. By providing the first sub-collecting channels 123, the coolant in the first flow channels 121 can be collected. Connecting all the first sub-collecting channels 123 to the first main collecting channel 124 allows the main collecting channel 124 to collect the coolant from all the first sub-collecting channels 123, facilitating the discharge of the coolant from the outlet 15. Optionally, the length of the first sub-collecting channel 123 extends along the second direction, and the length of the first total collecting channel 124 also extends along the second direction. This ensures that the first sub-collecting channel 123 can cover the area of ​​all the first flow channels 121 that need to be connected, and that the first total collecting channel 124 can cover the area of ​​all the first sub-collecting channels 123 that need to be connected. Each first sub-collecting channel 123 connects to the same number of first flow channels 121. For example, if the battery module 200 has eight rows of cell groups 200a, there will be nine guide gaps 202, corresponding to nine first flow channels 121. Therefore, three first sub-collecting channels 123 can be set, each connecting to three first flow channels 121. These three first sub-collecting channels 123 then connect to the first total collecting channel 124. The goal is to ensure that each first flow channel 121 connects to one first sub-collecting channel 123.

[0074] like Figure 8 and Figure 9 As shown (the reference numerals in the attached figures follow the same pattern) Figures 1 to 7 Appendix Figures 10 to 14The second liquid cooling plate 13 is provided with a second sub-collecting channel 133 and a second total collecting channel 134. Multiple second sub-collecting channels 133 are distributed along the second direction. Each second sub-collecting channel 133 connects to at least two second flow channels 131. All second sub-collecting channels 133 are connected to the second total collecting channel 134, which in turn connects to the liquid inlet 14. By providing the second total collecting channel 134, coolant from the liquid inlet 14 can be received. The coolant is then evenly distributed to the multiple second sub-collecting channels 133, achieving a first-stage distribution. The second sub-collecting channels 133 then distribute the coolant evenly to the multiple second flow channels 131 connected to them, achieving a second-stage distribution. After these two distributions, the coolant enters the receiving cavity 111 evenly through the second immersion hole 132 and then enters the guide gap 202 to uniformly dissipate heat from the multiple battery cells 201, improving the uniformity of heat dissipation. Optionally, the length of the second sub-collecting channel 133 extends along the second direction, and the length of the second total collecting channel 134 also extends along the second direction. This ensures that the second sub-collecting channel 133 can cover the area of ​​the second flow channel 131 that needs to be connected, and that the second total collecting channel 134 can cover the area of ​​all the second sub-collecting channels 133 that need to be connected, thus achieving a uniform current distribution effect. As in the example above, if the battery module 200 has eight rows of cells 200a, the number of second flow channels 131 is also nine. Three second sub-collecting channels 133 can be set, with each second sub-collecting channel 133 connecting to three second flow channels 131. Finally, the three second sub-collecting channels 133 connect to the second total collecting channel 134. The goal is to ensure that each second flow channel 131 connects to one second sub-collecting channel 133.

[0075] This application is not limited to the fact that the number of first channels 121 connected to all first sub-gathering channels 123 is the same, or they may be different. For example, one first sub-gathering channel 123 may connect to two first channels 121, or one first sub-gathering channel 123 may connect to three first channels 121.

[0076] It is not limited to the number of second channels 131 connected to all the second sub-gathering channels 133 being the same; they can also be different. For example, one second sub-gathering channel 133 can connect to two second channels 131, or one second sub-gathering channel 133 can connect to three second channels 131.

[0077] It is not limited to setting a first sub-gathering channel 123 and a second sub-gathering channel 133. A first total gathering channel 124 can be set to connect all the first flow channels 121, and a second total gathering channel 134 can be set to connect all the second flow channels 131.

[0078] In this embodiment, as Figure 13 As shown (the reference numerals in the attached figures follow the same pattern) Figures 1 to 12The second main collection channel 134 has an inlet area facing the inlet 14. A diverter 135 is provided in the inlet area. The outer side wall of the diverter 135 is at least partially arc-shaped, and the cross-sectional dimension of the end of the diverter 135 near the inlet 14 is smaller than the cross-sectional dimension of the end of the diverter 135 away from the inlet 14. By setting the diverter 135, the coolant delivered from the inlet 14 can be diverted, preventing the coolant from rushing towards a second sub-collecting channel 133. The diverter 135 first pre-diverts the coolant, and then the diverted coolant can be evenly delivered to each second sub-collecting channel 133, ensuring that the amount of coolant at the same temperature in each second channel 131 remains consistent. This allows each guide gap 202 to receive coolant at the same temperature and with a basically consistent flow rate, resulting in the same cooling effect for each cell 201, reducing the temperature difference between cells 201, and extending the service life of the entire battery module 200. By setting the outer wall of the diverter 135 with an arc surface, splashing of the coolant delivered from the inlet 14 at the diverter 135 can be reduced, ensuring that the coolant can adhere to the outer wall of the diverter 135 for diversion. The structure with a smaller upper end and a larger lower end can form a better diversion effect. The lower end of the diverter 135 forms a dispersed structure, ensuring that the coolant can be evenly distributed.

[0079] like Figure 14 and Figure 15As shown, the diverter 135 includes a diverter outer peripheral surface 135a, a diverter bottom surface 135b, and a diverter top surface 135c. The diverter top surface 135c and the diverter bottom surface 135b are spaced apart along a first direction. The diverter outer peripheral surface 135a connects the diverter top surface 135c and the diverter bottom surface 135b. The diverter bottom surface 135b connects to the bottom surface of the second main collection channel 134. The size of the diverter top surface 135c is smaller than that of the diverter bottom surface 135b. The dimensions are such that the top surface 135c of the diverter is closer to the inlet 14, while the bottom surface 135b of the diverter is farther from the inlet 14. The outer peripheral surface 135a of the diverter includes a connecting surface 1352 and a diverting guide surface 1351 that are interconnected along the periphery of the diverter 135. The connecting surface 1352 is connected to the inner surface of the second main collection channel 134. The diverting guide surface 1351 is a conical surface and faces the second sub-collection channel 133. The structural form of the diverter 135 is actually half of a cone cut in half along its central axis. A connecting surface 1352 is provided on the outer peripheral surface 135a of the distributor 135. This connecting surface 1352 can connect with the inner wall of the second main collection channel 134 (the connecting surface 1352 is not exposed, and the structure of the connecting surface 1352 is consistent with the structure of the inner wall of the second main collection channel 134 so that the connection can fit tightly). The conical distributor guide surface 1351 is exposed on the distributor 135. The conical structure is used to distribute the coolant from top to bottom. The conical structure minimizes the resistance and splashing of the coolant, ensuring that the coolant gradually disperses along the conical structure from the smaller top surface 135c to the larger bottom surface 135b. The dispersed coolant then enters the second sub-collection channel 133. At this time, the coolant will be more evenly distributed in each second sub-collection channel 133.

[0080] In one embodiment, the housing body 11 has a first opening and a second opening on both sides along a first direction. A first liquid cooling plate 12 is connected to the housing body 11 and seals the first opening, and a second liquid cooling plate 13 is connected to the housing body 11 and seals the second opening. Directly setting liquid cooling plates to seal the openings of the housing body 11 eliminates the need for additional top and bottom plates to seal the openings, reducing the number of components and saving space inside the battery housing 100. This increases the energy density of the battery modules 200 inside the battery housing 100. Furthermore, eliminating the top and bottom plates reduces the overall weight of the battery housing 100, thereby reducing the weight of the entire battery pack.

[0081] Optionally, such as Figures 3 to 5 (The reference numerals in the attached figures are the same as those in the attached figures) Figures 1 to 2 , attached Figures 6 to 14The first liquid cooling plate 12 includes a first substrate 125 and a first sealing plate 126. A first groove is recessed on one side of the first substrate 125, and this side is connected to the first sealing plate 126. The first sealing plate 126 seals the opening of the first groove to form a first flow channel 121 embedded in the first liquid cooling plate 12. A first immersion hole 122 is formed on either the first substrate 125 or the first sealing plate 126. By manufacturing the first liquid cooling plate 12 in steps using the first substrate 125 and the first sealing plate 126, and then assembling them, it is easier to form the first flow channel 121 and the first immersion hole 122, thus reducing manufacturing difficulty. Optionally, the first sealing plate 126 is located on the side of the first substrate 125 facing the interior of the receiving cavity 111, therefore the first immersion hole 122 is formed on the first sealing plate 126.

[0082] like Figures 6 to 9 (The reference numerals in the attached figures are the same as those in the attached figures) Figures 1 to 5 , attached Figures 10 to 14 The second liquid cooling plate 13 includes a second substrate 136 and a second sealing plate 137. A second groove is recessed on one side of the second substrate 136, and this side is connected to the second sealing plate 137. The second sealing plate 137 seals the opening of the second groove to form a second flow channel 131 embedded in the second liquid cooling plate 13. A second immersion hole 132 is formed on either the second substrate 136 or the second sealing plate 137. By manufacturing the second liquid cooling plate 13 in steps using the second substrate 136 and the second sealing plate 137 and then assembling them, it is easier to form the second immersion hole 132, reducing manufacturing difficulty. Optionally, the second sealing plate 137 is located on one side of the second substrate 136 facing away from the interior of the receiving cavity 111, therefore the second immersion hole 132 is formed on the second substrate 136.

[0083] The liquid inlet 138, the diverter 135 and the second substrate 136 are integrally manufactured. When the second sealing plate 137 is assembled on the second substrate 136, the diverter bottom surface 135b of the diverter 135 abuts against the side of the second sealing plate 137 near the second substrate 136.

[0084] The first substrate 125 will also have recesses formed at positions corresponding to the first sub-gathering channel 123 and the first total gathering channel 124. After the first sealing plate 126 is installed on the first substrate 125, the recesses will be sealed to form the first sub-gathering channel 123 and the first total gathering channel 124.

[0085] The second substrate 136 will also have recesses formed at positions corresponding to the second sub-collection channel 133 and the second total collection channel 134. After the second sealing plate 137 is installed on the second substrate 136, the recesses are sealed to form the second sub-collection channel 133 and the second total collection channel 134.

[0086] Additionally, a limiting protrusion 139 protrudes from one side of the second substrate 136 away from the second sealing plate 137. The limiting protrusion 139 and the liquid inlet 138 are located on the same side of the second substrate 136, and are adjacent to both ends of the second substrate 136 along a third direction. The limiting protrusion 139 primarily fills the space between the battery module 200 and the inner wall of the housing body 11, preventing the battery module 200 from moving within the receiving cavity 111 along a third direction. In this embodiment, the liquid inlet 138, the second substrate 136, and the limiting protrusion 139 are integrally manufactured. This integrated structure facilitates installation.

[0087] Optionally, the sum of the areas of all the first immersion holes 122 is S1, and the sum of the cross-sectional areas of all the first flow channels 121 along the second direction is S2. The ratio of S1 to S2 can satisfy 3:50 or 1:10. For example, the ratio of S1 to S2 can be 3:50, 3:43, 3:37.5, 3:33, 1:10, etc.; the sum of the areas of all the second immersion holes 132 is S3, and the sum of the cross-sectional areas of all the second flow channels 131 along the second direction is S4. The ratio of S3 to S4 can satisfy 3:50 or 1:10. For example, the ratio of S3 to S4 can be 3:50, 3:43, 3:37.5, 3:33, 1:10, etc.

[0088] The battery module 200 has an area of ​​S6, where the ratio of S1, S2, and S6 can satisfy 13:120:45500 or 13:130:45500, and the ratio of S3, S4, and S6 can also satisfy 13:120:45500 or 13:130:45500. The areas of the first immersion hole 122 and the second immersion hole 132 need to be controlled; they cannot be too large, as this would affect the convection effect.

[0089] like Figures 10 to 14 As shown (some of the reference numerals in the accompanying drawings are retained), Figures 1 to 9 This application also provides a battery pack, including a battery module 200 and a battery housing 100. The battery module 200 is sealed and installed inside the battery housing 100. The battery housing 100 is any of the battery housings described above. The structure of the battery housing 100 will not be described in detail here.

[0090] In this embodiment, the battery module 200 has multiple rows of cell groups 200a arranged along a second direction. Each row of cell groups 200a includes multiple cells 201 arranged along a third direction, and adjacent rows of cell groups 200a are staggered. This design allows the battery module 200 to be arranged more compactly, ensuring higher space utilization within the battery housing 100, and resulting in a higher energy density for the battery pack formed after assembling the battery module 200.

[0091] Optionally, the length of the battery cell 201 extends along a first direction.

[0092] The cooling method for this battery pack includes the following steps:

[0093] Step S100: Provide coolant, so that the coolant enters the inlet channel 1381 of the inlet component 138 from the inlet 14 of the battery box 100, and flows along the first direction to the diverter 135 in the second main collection channel 134. The diverter 135 diverts the coolant so that the coolant enters the second sub-collection channel 133.

[0094] In step S200, the coolant in the second sub-collection channel 133 is diverted to each second flow channel 131. The coolant in the second flow channel 131 enters the receiving cavity 111 through the second immersion hole 132 and enters each flow guide gap 202 of the battery module 200 to immerse and dissipate heat from each cell 201.

[0095] Step S300: The coolant after heat exchange enters the first flow channel 121 through the first immersion hole 122;

[0096] In step S400, the coolant in all the first flow channels 121 first gathers into the corresponding first sub-gathering channel 123, and then all the coolant in the first sub-gathering channel 123 gathers into the first total gathering channel 124 and is discharged to the outside of the battery box 100 through the outlet 15.

[0097] In addition, after the coolant is discharged into the battery housing 100, external cooling equipment can be used to cool the coolant. The cooled coolant is then circulated back to the inlet 14 and re-enters the battery housing 100 to cool the battery module 200.

[0098] like Figures 16 to 22 As shown in the embodiment, this application also provides a battery pack, which includes a battery housing 300 and a battery module 400 disposed within the battery housing 300. In this embodiment, the first direction is the vertical direction, the second direction is the width direction of the battery housing 300, and the third direction is the length direction of the battery housing 300. The main differences between the battery housing 300 and the battery housing 100 are: 1) the addition of a support member 28 and a limiting member 29 for supporting the battery module 400; 2) the adjustment of the positions of the liquid inlet 24 and the liquid outlet 25; 3) the adjustment of the arrangement and connection of the first flow channel 221 of the first liquid cooling plate 22; and 4) the adjustment of the arrangement and connection of the second flow channel 231 of the second liquid cooling plate 23.

[0099] Due to space limitations, the similarities between the battery housing 300 and the battery housing 100, as well as the similarities between the battery module 400 and the battery module 200, will not be elaborated in detail. The following mainly introduces the differences of the battery housing 300 in this embodiment.

[0100] See Figures 16 to 17 As shown, the battery housing 300 includes a housing body 21, a first liquid cooling plate 22, and a second liquid cooling plate 23. The housing body 21 has a receiving cavity 211 for accommodating the battery module 400. The first liquid cooling plate 22 and the second liquid cooling plate 23 are located on both sides of the receiving cavity 211 along a first direction. A plurality of first flow channels 221 are distributed in the first liquid cooling plate 22 along a second direction. The length of each first flow channel 221 extends along a third direction. A plurality of first immersion holes 222 are opened on one side of the first liquid cooling plate 22 facing the receiving cavity 211. All the first immersion holes 222 connect the first flow channels 221 and the receiving cavity 211, and all the first immersion holes 222 connecting the same first flow channel 221 are spaced apart along a third direction. Multiple second flow channels 231 are distributed within the second liquid cooling plate 23 along the second direction. The length of each second flow channel 231 extends along the third direction. Multiple second immersion holes 232 are provided on one side of the second liquid cooling plate 23 facing the receiving cavity 211. All the second immersion holes 232 connect the second flow channel 231 and the receiving cavity 211. All the second immersion holes 232 connecting the same second flow channel 231 are spaced apart along the third direction.

[0101] In this embodiment, the second liquid cooling plate 23 is located below the housing body 21, and the first liquid cooling plate 22 is located above the housing body 21. The second liquid cooling plate 23 is also provided with a liquid inlet 24, which is connected to the second flow channel 231 and is connected to an inlet connector 26. The first liquid cooling plate 22 is also provided with a liquid outlet 25, which is connected to the first flow channel 221 and is connected to an outlet connector 27. Coolant is injected through the inlet connector 26, enters the second flow channel 231 through the inlet 24, flows into the receiving cavity 211 through multiple second immersion holes 232 to immerse the battery module 400, then flows into the first flow channel 221 through the first immersion holes 222, and flows out through the outlet 25 and outlet connector 27. By placing the second liquid cooling plate 23 and the first liquid cooling plate 22 below and above the battery module 400 respectively, the heat dissipation path can be shortened, the heat exchange effect between the coolant and the battery module 400 can be improved, the temperature difference at different locations of the battery module 400 can be reduced, and the service life of the battery module 400 can be extended.

[0102] In one embodiment, both the inlet connector 26 and the outlet connector 27 are connected to a refrigeration device, which enables the cooling and recycling of the coolant. Refrigeration devices from related technologies can also be used in this application, and will not be described in detail here.

[0103] In this embodiment, the inlet 24 and outlet 25 are located at the two ends of the housing body 21 in the third direction, respectively, to ensure that the coolant can fully submerge the battery module 400 before flowing out from the outlet 25, thus shortening the coolant flow path and improving the heat dissipation effect. The inlet 24 is located on the side of the second liquid cooling plate 23 near the housing body 21; the outlet 25 is located on the side of the first liquid cooling plate 22 near the housing body 21, which can reduce the overall height of the battery housing 300 in the first direction and reduce the volume of the battery housing 300.

[0104] In other embodiments, such as Figure 23 As shown, the liquid inlet 34 and liquid outlet 35 can also be located on the same side of the battery housing 300 along a third direction. The liquid inlet 34 is connected to the second liquid cooling plate 33 through the liquid inlet channel 381, and the liquid outlet 35 is connected to the first liquid cooling plate 32 through the liquid outlet channel 382. The liquid inlet 34 is provided with an inlet connector 36, and the liquid outlet 35 is provided with an outlet connector 37. Both the inlet connector 36 and the outlet connector 37 are connected to refrigeration equipment, which enables the cooling and recycling of the coolant. A liquid inlet component 38 is provided within the receiving cavity 211, and the liquid inlet component is connected to both the first liquid cooling plate 32 and the second liquid cooling plate 33. The liquid inlet channel 381 and the liquid outlet channel 382 are both located within the liquid inlet component 38.

[0105] See Figures 17 to 19 As shown, the battery housing 300 also includes a limiting member 29, which is placed within the receiving cavity 211 of the housing body 21. The limiting member 29 has a receiving space 291 extending through its thickness direction, within which the battery module 400 is housed. By providing the limiting member 29, the battery module 400 can be confined within the receiving space 291. This not only enables the battery module 400 to be positioned and installed, but also allows the coolant to fill only the receiving space 291 to immerse the battery module 400, without needing to fill the entire receiving cavity 211 of the housing body 21. This reduces coolant usage, lowers costs, reduces the overall weight of the battery pack, improves coolant circulation efficiency, and ensures effective heat dissipation.

[0106] The battery module 400 has multiple rows of battery cell groups 400a arranged along a second direction. Each row of battery cell group 400a includes multiple battery cells 401 arranged along a third direction. A flow guide gap 402 is formed between adjacent battery cells 401 and between battery cells 401 and the inner wall of the accommodating space 291 to allow coolant to flow.

[0107] See Figure 20As shown, the inner wall of the accommodating space 291 has a plurality of sequentially arranged cell-shaped surfaces 291a. A first flow-guiding gap 402a is formed between the cell 401 located in the middle position of the battery module 400 and the cells 401 on its periphery. A second flow-guiding gap 402b is formed between the cell 401 located at the outermost edge of the battery module 400 and the adjacent cells 401 and the cell-shaped surfaces 291a. The cross-sectional shape of the second flow-guiding gap 402b is approximately the same as the cross-sectional shape of the first flow-guiding gap 402a. By setting a cell-shaped surface 291a on the inner wall of the accommodating space 291 to mimic the arrangement of the cells 401 in the battery module 400, the flow rate of coolant around the cells 401 located on the outer edge is equivalent to the flow rate of coolant around the cells 401 located in the middle position. This ensures that the heat dissipation efficiency of the cells 401 in different positions is equivalent, and that the temperature of the cells 401 in different positions is equivalent, thereby improving the overall temperature consistency of the battery module 400.

[0108] The battery housing 300 also includes a support member 28, which is located above the second liquid cooling plate 23 and is configured to support the battery module 400. The support member 28 has multiple through holes 281 that connect the flow guide gaps 402 and the second immersion hole 232. The flow guide gaps 402 are configured to allow coolant to flow so that the coolant can immerse the battery cell 401 and allow the coolant to flow into the first flow channel 221 from the first immersion hole 222.

[0109] In practical applications, coolant flows from the inlet connector 26 into the second flow channel 231 through the inlet port 24, and then flows into the guide gap 402 through the second immersion hole 232 and the through hole 281. The coolant gradually overflows from the bottom of the battery module 400, over the top, and flows into the first flow channel 221 through the first immersion hole 222. It then flows out through the outlet port 25 and the outlet interface 27. Throughout this process, the battery module 400 is immersed in the coolant, achieving immersion thermal management of the battery module 400. (Continue to see...) Figures 17-18 As shown, the through hole 281 and the second immersion hole 232 are arranged one-to-one to ensure that the coolant flowing out from each second immersion hole 232 can flow directly into the guide gap 402 through the through hole 281, thereby improving the flow rate of the coolant and thus improving the heat dissipation efficiency of the coolant.

[0110] The diameter of the multiple through holes 281 corresponding to a row of battery cells 400a gradually decreases from the location of the liquid inlet 24 to the direction away from the liquid inlet 24. Figure 18(From right to left in the third direction). That is, the diameter of the through hole 281 near the liquid inlet 24 is smaller than the diameter of the through hole 281 away from the liquid inlet 24. After the coolant enters the second flow channel 231 from the liquid inlet 24, it flows sequentially through each second immersion hole 232 in the third direction and flows into the guide gap 402 from each second immersion hole 232. In this process, since the coolant first flows through the cell 401 near the liquid inlet 24 and then flows through the cell 401 away from the liquid inlet 24, based on this, the diameter of the multiple through holes 281 is set to gradually decrease from the position of the liquid inlet 24 to the direction away from the liquid inlet 24. This can ensure that the flow rate and flow volume of the coolant flowing around the cell 401 at different positions in the battery module 400 are similar, reduce the temperature difference of the cell 401 at different positions, and thus ensure the overall temperature consistency of the battery module 400.

[0111] See Figure 17 and Figure 21 and Figure 22 As shown, the support member 28 has multiple positioning grooves 282 that correspond one-to-one with the battery cells 401. The bottom of the battery cell 401 is housed within the positioning groove 282, which limits the positioning of the battery cell 401 and facilitates its positioning and assembly. The multiple positioning grooves 282 that correspond to a row of battery cell groups 400a are connected to each other to allow coolant to flow between the rows of battery cell groups 400a, facilitating heat transfer of coolant at different locations.

[0112] Each positioning groove 282 has two spaced support blocks 283, which are configured to support the battery cell 401, so that the bottom of the battery cell 401 is spaced apart from the bottom surface of the positioning groove 282, so as to ensure that the coolant can flow at the bottom of the battery cell 401 and cool the bottom of the battery cell 401.

[0113] In this embodiment, the gap between the two support blocks 283 in the same positioning groove 282 forms a flow guiding space, which is connected with the flow guiding space corresponding to a row of battery cells 400a to form a flow guiding channel 283a, so that the coolant can flow between the row of battery cells 400a and facilitate the heat transfer of the coolant at different positions.

[0114] In addition, by using the support member 28 to form a flow channel 283a under each row of cells 400a in the battery module 400, not only can heat dissipation be carried out on the bottom of the cells 401 at different positions, achieving the effect of full immersion cooling of the cells 401, but also in the event of thermal runaway of the cells 401, the bottom valve can be opened to quickly cool the cells 401, and the heat can be quickly carried out of the battery box 300, suppressing the spread of thermal runaway and improving the safety of the battery pack.

[0115] The cooling method for this battery pack includes the following steps:

[0116] Step S101: Provide coolant, so that the coolant flows into the second flow channel 231 from the inlet 14. The coolant in the second flow channel 231 enters the receiving space 291 of the limiting member 29 through the second immersion hole 232, and enters each flow guide gap 402 of the battery module 400 to immerse and dissipate heat from each cell 401.

[0117] Step S201: After heat exchange, the coolant enters the first flow channel 221 through the first immersion hole 222 and is discharged to the outside of the battery box 300 through the outlet 15.

[0118] Step S301: After the coolant is discharged into the battery box 300, an external refrigeration device can be used to cool the coolant. The cooled coolant is then circulated back to the inlet 14 and re-enters the battery box 300 to cool the battery module 400.

Claims

1. A battery box, comprising a box body, a first liquid cooling plate, a second liquid cooling plate, an inlet and an outlet; the box body is provided with a containing cavity for containing a battery module, the first liquid cooling plate and the second liquid cooling plate are respectively located on two sides of the containing cavity along a first direction; a plurality of first flow channels are distributed in the first liquid cooling plate along a second direction, the length of each first flow channel extends along a third direction, a plurality of first immersion holes are formed in a side of the first liquid cooling plate facing the containing cavity, the plurality of first immersion holes are in communication with the plurality of first flow channels and the containing cavity, and the first immersion holes in communication with the same first flow channel are arranged at intervals along the third direction; a plurality of second flow channels are distributed in the second liquid cooling plate along the second direction, the length of each second flow channel extends along the third direction, a plurality of second immersion holes are formed in a side of the second liquid cooling plate facing the containing cavity, the plurality of second immersion holes are in communication with the plurality of second flow channels and the containing cavity, and the second immersion holes in communication with the same second flow channel are arranged at intervals along the third direction, the first direction, the second direction and the third direction are arranged at an angle with respect to each other; the outlet is in communication with the plurality of first flow channels, and the inlet is in communication with the plurality of second flow channels.

2. The battery pack of claim 1, wherein, The battery module has a plurality of rows of cell groups arranged along the second direction, each row of cell groups includes a plurality of cells arranged along the third direction, and at least two adjacent rows of cell groups form a flow guiding gap therebetween; each flow guiding gap corresponds to one first flow channel and one second flow channel.

3. The battery pack of claim 2, wherein, Flow guiding gaps are also formed between the battery module and the box body on both sides of the battery module along the second direction.

4. The battery pack of claim 2, wherein, The plurality of first immersion holes and the plurality of second immersion holes are arranged one by one.

5. The battery pack of any one of claims 1 to 4, wherein, The first liquid cooling plate and the second liquid cooling plate are distributed along the first direction; the first liquid cooling plate is located above the second liquid cooling plate; or, the second liquid cooling plate is located above the first liquid cooling plate.

6. The battery pack of any one of claims 1 to 4, wherein, The inlet and the outlet are located on the same side of the battery box along the first direction, the inlet is in communication with the second liquid cooling plate through an inlet passage, and the outlet is arranged on the first liquid cooling plate.

7. The battery pack of claim 6, wherein, An inlet member is arranged in the containing cavity, the inlet member is connected with the first liquid cooling plate and the second liquid cooling plate respectively, the inlet passage is arranged in the inlet member, the inlet penetrates through the first liquid cooling plate and is in communication with the inlet passage, the inlet is arranged at intervals with the plurality of first flow channels, and the inlet passage is in communication with the plurality of second flow channels.

8. The battery pack of claim 7, wherein, The inlet member is fixedly connected with the second liquid cooling plate.

9. The battery pack of any one of claims 1 to 4, wherein, The first liquid cooling plate and the second liquid cooling plate comprise one of the following arrangements: a plurality of first sub-converging passages and a first total-converging passage are arranged in the first liquid cooling plate, the plurality of first sub-converging passages are distributed along the second direction, each first sub-converging passage is in communication with at least two first flow channels, the plurality of first sub-converging passages are in communication with the first total-converging passage, and the first total-converging passage is in communication with the outlet; or, A plurality of second sub-converging channels and a second total converging channel are arranged in the second liquid cooling plate, the plurality of second sub-converging channels are distributed along the second direction, each of the second sub-converging channels communicates with at least two second flow channels, the plurality of second sub-converging channels communicate with the second total converging channel, and the second total converging channel communicates with the liquid inlet.

10. The battery pack of claim 9, wherein, The first liquid cooling plate is located above the second liquid cooling plate. The second total converging channel has a liquid inlet area opposite to the liquid inlet, and a flow divider is arranged in the liquid inlet area, an outer side wall of the flow divider is at least partially arc-shaped, and a cross-sectional dimension of one end of the flow divider close to the liquid inlet is smaller than a cross-sectional dimension of one end of the flow divider away from the liquid inlet.

11. The battery pack of claim 10, wherein, The flow divider includes a flow divider outer peripheral surface, a flow divider bottom surface, and a flow divider top surface, the flow divider top surface and the flow divider bottom surface are arranged apart along the first direction, the flow divider outer peripheral surface connects the flow divider top surface and the flow divider bottom surface, the flow divider bottom surface connects a bottom surface of the second total converging channel, a dimension of the flow divider top surface is smaller than a dimension of the flow divider bottom surface, the flow divider outer peripheral surface includes a connecting surface and a flow divider guide surface connected to each other along a peripheral portion of the flow divider, the connecting surface is connected to an inner side surface of the second total converging channel, the flow divider guide surface is a tapered surface, and the flow divider guide surface faces the plurality of second sub-converging channels.

12. The battery pack of any one of claims 1 to 4, wherein, The first liquid cooling plate and the second liquid cooling plate include one of the following arrangements: The first liquid cooling plate includes a first base plate and a first sealing plate, a first recess is recessed in one side surface of the first base plate, one side surface of the first base plate provided with the first recess is connected to the first sealing plate, the first sealing plate seals a slot opening of the first recess to form the first flow channel, and the first immersion hole is formed in the first base plate or the first sealing plate; or the second liquid cooling plate includes a second base plate and a second sealing plate, a second recess is recessed in one side surface of the second base plate, one side surface of the second base plate provided with the second recess is connected to the second sealing plate, the second sealing plate seals a slot opening of the second recess to form the second flow channel, and the second immersion hole is formed in the second base plate or the second sealing plate.

13. The battery pack of any one of claims 1 to 4, wherein, First and second openings are respectively arranged on both sides of the box body along the first direction, the first liquid cooling plate is connected to the box body and seals the first opening, and the second liquid cooling plate is connected to the box body and seals the second opening.

14. The battery pack of any one of claims 1 to 4, wherein, A sum of areas of the plurality of first immersion holes is S1, a sum of cross-sectional areas of the plurality of first flow channels along the second direction is S2, and a relationship ratio of S1 and S2 satisfies 3:50 or 1:10; A sum of areas of the plurality of second immersion holes is S3, a sum of cross-sectional areas of the plurality of second flow channels along the second direction is S4, and a relationship ratio of S3 and S4 satisfies 3:50 or 1:10; An area of the battery module is S6; The relationship ratio of the above areas at least satisfies at least one of the following conditions: The relationship ratio of S1, S2, and S6 satisfies 13:120:45500 or 13:130:45500; or The relationship of S3, S4 and S6 satisfies: 13:120:45500 or 13:130:45500.

15. The battery box of claim 1, further comprising a limiting member disposed in the accommodating cavity, the limiting member having an accommodating space penetrating the first direction, and the battery module is accommodated in the accommodating space.

16. The battery pack of claim 15, wherein, The battery module has a plurality of rows of cell groups arranged along the second direction, each row of cell groups comprising a plurality of cells arranged along the third direction, and a flow guiding gap is formed between adjacent cells and between the cells and the inner wall of the accommodating space.

17. The battery pack of claim 16, wherein, The inner wall of the accommodating space has a plurality of cell profiling surfaces arranged in sequence, a first flow guiding gap is formed between each cell located at a middle position in the battery module and a cell located at a periphery, and a second flow guiding gap is formed between each cell located at an outermost edge in the battery module and an adjacent cell and the cell profiling surface, and the cross-sectional shape of the second flow guiding gap is the same as that of the first flow guiding gap.

18. The battery box of claim 16, further comprising a support member configured to support the battery module, the support member having a plurality of through holes communicating the flow guiding gap and the second flow channel.

19. The battery pack of claim 18, wherein, The through holes are arranged one-to-one corresponding to the second immersion holes.

20. The battery pack of claim 19, wherein, The aperture of the plurality of through holes corresponding to one row of cell groups gradually decreases from a position where the liquid inlet is located to a direction away from the liquid inlet.

21. The battery pack of claim 20, wherein, The support member has a plurality of positioning grooves arranged one-to-one corresponding to the cells.

22. The battery pack of claim 21, wherein, Each positioning groove has two support blocks arranged at intervals, and the support blocks are configured to support the cells so that the bottom surface of the cell and the groove bottom surface of the positioning groove are arranged at intervals.

23. The battery pack of claim 22, wherein, The interval between the two support blocks in the same positioning groove forms a flow guiding space, and the flow guiding spaces corresponding to one row of cell groups are communicated to form a flow guiding flow channel.

24. The battery pack of claim 21, wherein, The plurality of positioning grooves corresponding to one row of cell groups are communicated.

25. The battery pack of any one of claims 15 to 24, wherein, The liquid inlet is arranged on the second liquid cooling plate, and the liquid outlet is arranged on the first liquid cooling plate.

26. The battery pack of claim 25, wherein, The liquid inlet is located on the side of the second liquid cooling plate close to the battery box, and the liquid outlet is located on the side of the first liquid cooling plate close to the battery box.

27. The battery pack of claim 26, wherein, The liquid inlet and the liquid outlet are respectively located at both ends of the battery box in the third direction, or the liquid inlet and the liquid outlet are respectively located on the same side of the battery box in the third direction.

28. The battery pack of any one of claims 15 to 24, wherein, The liquid inlet is communicated with the second liquid cooling plate through a liquid inlet channel, and the liquid outlet is communicated with the first liquid cooling plate through a liquid outlet channel.

29. The battery pack of claim 28, wherein, The accommodating cavity is provided with a liquid inlet member, and the liquid inlet channel and the liquid outlet channel are arranged in the liquid inlet member, and the liquid inlet member is connected with the first liquid cooling plate and the second liquid cooling plate respectively.

30. The battery pack of claim 29, wherein, The liquid inlet and the liquid outlet are respectively located at both ends of the battery box in the third direction, or the liquid inlet and the liquid outlet are respectively located on the same side of the battery box in the third direction. 31.A battery pack, comprising a battery module and the battery box as claimed in any one of claims 1 to 30, the battery module being sealingly installed in the battery box.

32. The battery pack of claim 31, wherein, The battery module has a plurality of rows of battery cell groups arranged along the second direction, each row of the battery cell groups comprising a plurality of battery cells arranged along the third direction, and two adjacent rows of the battery cell groups are arranged in a staggered manner, and the battery cells are cylindrical battery cells.

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