Liquid cooling assembly, battery module, and battery pack

Abstract

The present application provides a liquid cooling assembly, a battery module, and a battery pack. The liquid cooling assembly comprises a plurality of liquid cooling unit members which are evenly spaced. Each liquid cooling unit member is provided with a conveying pipe body, a pipe snap-fit head, and a pipe fastening head, and liquid cooling plate members movably connected to the conveying pipe body, and the pipe snap-fit head and the pipe fastening head are respectively arranged at the two ends of the conveying pipe body; and the pipe snap-fit head of the liquid cooling unit member is snap-fitted with the pipe fastening head of an adjacent liquid cooling unit member.

Description

Liquid cooling assembly, battery module and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 4, 2023, with application number 202311650110.8. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a liquid cooling assembly, a battery module and a battery pack. Background Art

[0003] With economic development and technological advancement, lithium batteries, as one of the cleanest secondary energy sources, have gained widespread favor. Their advantages include light weight, high energy storage, high power, no pollution, long life, low self-discharge coefficient, and wide temperature adaptability. As a result, they have gradually gained popularity and are gradually replacing other traditional batteries in the energy storage and power battery fields.

[0004] For example, a battery module and a battery pack having the same in the related art include a support plate, a cooling plate, and a plurality of battery cells; the plurality of battery cells are mounted on the support plate, the cooling plate is mounted on the support plate, the side walls of the battery cells are attached to the surface of the cooling plate, a microchannel is provided on the cooling plate, a protrusion is provided on the inner wall of the microchannel, and the two ends of the microchannel are connected to an inlet pipe and an outlet pipe, respectively. The inlet pipe is used for cooling liquid to enter and flow out of the outlet pipe through the microchannel. In addition, a first fixing post is provided at one end of the cooling plate, the first fixing post is mounted on the support plate, the first fixing post is connected to one end of the plurality of microchannels, and the inlet pipe passes through the plurality of first fixing posts to connect one end of the plurality of cooling plates in series.

[0005] Battery modules based on this related technology can effectively improve heat dissipation efficiency and extend the life of battery cells. However, during the production and assembly of battery modules, it was discovered that due to manufacturing errors in the production of components such as cooling plates, as well as assembly tolerances during the assembly process (such as the assembly tolerance between the battery cells and the cooling plates), the model and size of the machined inlet pipes were already determined. As a result, the accumulation of errors and assembly tolerances would lead to difficulties in assembly of the battery modules, and even the inability to assemble them. Technical Solutions

[0006] In a first aspect, the present application provides a liquid cooling assembly comprising a plurality of spaced-apart liquid cooling units, each of which comprises a delivery pipe body, a pipe clamping head, a pipe fastening head, and a liquid cooling plate movably connected to the delivery pipe body, wherein the pipe clamping head and the pipe fastening head are respectively disposed at both ends of the delivery pipe body;

[0007] The pipe clamping head of the liquid cooling unit is engaged with the pipe buckle head of the adjacent liquid cooling unit, so that the two adjacent delivery pipe bodies are connected.

[0008] In a second aspect, the present application provides a battery module, comprising:

[0009] The liquid cooling assembly provided by this application;

[0010] The battery pack has several rows of battery cells, each battery cell has several battery cells, and the battery cells are arranged along the length direction of the liquid cooling plate of the liquid cooling assembly. Each battery cell is arranged between two liquid cooling plates, and each battery cell can exchange heat with the liquid cooling plate.

[0011] In a third aspect, the present application provides a battery pack, including: the battery module provided in the present application. Beneficial effects

[0012] The beneficial effects of a liquid cooling assembly, battery module and battery pack of the present application are as follows: through the cooperation of the pipe clamping head and the pipe snap-fitting head, not only can multiple conveying pipe bodies be connected and communicated with each other; at the same time, the liquid cooling assembly can be adjusted along the extension direction of the conveying pipe body, thereby compensating for and eliminating the error accumulation in the extension direction of the conveying pipe body, that is, the assembler can flexibly adjust the clamping position between the pipe clamping head and the pipe snap-fitting head according to the production error of the liquid cooling plate and the assembly tolerance between the liquid cooling plate and the battery cell, so that each battery cell of the battery unit can stably exchange heat with the liquid cooling plate, ensure the assembly accuracy of the battery module, reduce the assembly difficulty of the battery module, avoid the battery module in the related technology that is easy to assemble difficult or even unable to be assembled into a group, and ensure the overall structural strength of the liquid cooling assembly, and avoid leakage of the liquid cooling assembly during the adjustment process; in addition, it is also beneficial to connect multiple liquid cooling plates in parallel, thereby reducing the flow resistance of the liquid cooling system in the battery pack and improving the flow uniformity of the liquid cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of the overall assembly of a liquid cooling component of the present application;

[0014] FIG2 is a schematic diagram of the overall structure of the liquid cooling unit in this application;

[0015] FIG3 is a schematic diagram of a portion of the structure of the liquid cooling unit in this application;

[0016] FIG4 is a schematic diagram of another part of the structure of the liquid cooling unit in this application;

[0017] FIG5 is a schematic diagram of the overall structure of a battery module of the present application;

[0018] FIG6 is a schematic diagram of a liquid cooling assembly in an unfastened connection state according to the present application;

[0019] FIG7 is a schematic diagram of a liquid cooling assembly in a fastened connection state according to the present application;

[0020] FIG8 is a schematic diagram of another state of a liquid cooling assembly in the present application after being fastened and connected. Modes for Carrying Out the Invention

[0021] Specifically, please refer to Figure 5. An embodiment of the present application discloses a battery module, including a battery pack and a liquid cooling assembly. The battery pack has several rows of battery cells 2, and the battery cells 2 have several battery cells 21. Among them, the battery cells 21 are preferably cylindrical batteries. Of course, they can also be square batteries.

[0022] In this embodiment, the above-mentioned liquid cooling assembly includes a number of liquid cooling units 1 arranged at intervals, each liquid cooling unit 1 has a delivery tube body 11 and a liquid cooling plate 14 movably connected to the delivery tube body 11, and a number of battery cells 21 are arranged along the length direction of the liquid cooling plate 14 of the liquid cooling assembly, that is, the arrangement direction of the number of battery cells 21 is consistent with the length direction of the liquid cooling plate 14, each battery unit 2 is arranged between two liquid cooling plates 14, and each battery cell 21 can exchange heat with the liquid cooling plate 14.

[0023] Among them, the liquid cooling plate 14 has a heat exchange contact surface 143, and the external heat exchange medium (such as coolant, water, etc.) is supplied to the liquid cooling plate 14 through the conveying pipe body 11. When the battery cell 21 is in the charging and discharging state, the temperature of the battery cell 21 is higher than the heat exchange medium on the liquid cooling plate 14. The large amount of heat released from the battery cell 21 will be transferred to the heat exchange contact surface 143 and transferred to the heat exchange medium, and finally discharged from the liquid cooling component with the flow of the heat exchange medium, thereby realizing the cooling of the battery pack by the liquid cooling component, so that each battery cell 21 of the battery pack is used within the optimal temperature range.

[0024] As shown in Figure 5, in order to ensure that the large amount of heat released by the battery cell 21 can be absorbed in time by the liquid cooling plate 14 of the liquid cooling assembly, thereby improving the heat exchange efficiency of the liquid cooling plate 14, the heat exchange contact surface 143 of the liquid cooling plate 14 is arranged in a wavy shape, that is, the heat exchange contact surface 143 of the liquid cooling plate 14 has a plurality of arc-shaped troughs, and each battery cell 21 is correspondingly abutted and fitted in the corresponding trough, and the shape and size of each trough are preferably adapted to the shape and size of the battery cell 21, so that the heat exchange area between the battery cell 21 and the heat exchange contact surface 143 is larger, thereby maximizing the heat exchange efficiency of the liquid cooling plate 14, and can effectively avoid the risk of thermal runaway of each battery cell 21 of the battery pack.

[0025] In some embodiments, specifically referring to Figures 1, 2 and 5, the above-mentioned liquid cooling assembly includes a pipe clamping head 12 and a pipe snap-fit ​​head 13, and the pipe clamping head 12 and the pipe snap-fit ​​head 13 are respectively arranged at both ends of the delivery pipe body 11, that is, the pipe clamping head 12, the pipe snap-fit ​​head 13 and the delivery pipe body 11 are integrally formed to ensure the sealing and structural strength of the pipe, thereby ensuring the overall structural stability of the liquid cooling assembly.

[0026] The pipe clamping head 12 of the liquid cooling unit 1 is engaged with the pipe snap-fitting head 13 of the adjacent liquid cooling unit 1, so that the two adjacent conveying pipe bodies 11 are connected. This installation connection method is more efficient and convenient, and reduces the difficulty of connecting the conveying pipe bodies 11 to each other.

[0027] In some embodiments, specifically referring to FIG. 1 and FIG. 2 , the pipe fastening head 13 can be movably adjusted with the pipe clamping head 12 in the first extension direction G of the delivery pipe body 11 so that two adjacent liquid cooling plates 14 are spaced apart.

[0028] Specifically, the pipe clamping head 12 and the pipe fastening head 13 are provided with an adjustment space L3 when they are fastened together, so that the pipe clamping head 12 can change the position of the pipe clamping head 12 along the first extension direction G of the conveying pipe body 11, thereby achieving the purpose of movable adjustment of the pipe fastening head 13 and the pipe clamping head 12.

[0029] Therefore, when there are production errors during the production of parts such as the liquid cooling plate 14, and when there are assembly tolerances during the assembly of parts, that is, when there are accumulated errors in the first extension direction G of the delivery tube body 11, the position of the pipe clamping head 12 and the pipe snap-fit ​​head 13 can be adjusted. In this way, by adjusting the position of the pipe clamping head 12 and the pipe snap-fit ​​head 13 along the first extension direction G of the delivery tube body 11, the accumulated errors in the first extension direction G of the delivery tube body 11 can be compensated and eliminated. This not only ensures that two adjacent liquid cooling plates 14 are spaced apart, but also allows each battery cell 21 of the battery unit 2 to stably exchange heat with the liquid cooling plate 14, thereby ensuring the assembly accuracy of the battery module and reducing the difficulty of battery module assembly.

[0030] It is important to note that by adjusting the engagement position between the pipe clamping head 12 and the pipe snap-fitting head 13 based on the production tolerances of the liquid-cooling plate 14 and the assembly tolerances between the liquid-cooling plate 14 and each battery cell 21, the delivery tube body 11 itself does not need to be altered in terms of structure or construction. This prevents damage to the delivery tube body 11 during tensile deformation or leakage caused by localized stress concentration. Therefore, the delivery tube body 11 can be manufactured using materials with high overall properties such as hardness and strength. This also avoids the long-term oxidation and aging that would occur with flexible, highly plastic non-metallic materials. This effectively ensures the stability and safety of the liquid-cooling assembly and the battery pack incorporating it during long-term use.

[0031] It should also be noted that the spacing distribution between the two adjacent liquid cooling plates 14 can be such that the two adjacent liquid cooling plates 14 maintain the same spacing, or the spacing between the two adjacent liquid cooling plates 14 can be different, that is, the battery cells 2 between the two adjacent liquid cooling plates 14 are configured in multiple rows.

[0032] In some embodiments, specifically referring to Figures 1, 2 and 4, the pipe clamping head 12 includes a first connecting tube 121 and a clamping force receiving arm 122 provided on the outside of the first connecting tube 121, and the pipe snap-fitting head 13 includes a second connecting tube 132 and a clamping force receiving portion 131 provided on the second connecting tube 132. The outer diameter of the first connecting tube 121 is preferably smaller than the inner diameter of the second connecting tube 132 within the assembly tolerance range. The first connecting tube 121 is plugged into the second connecting tube 132, and the clamping force receiving arm 122 is clamped to the clamping force receiving portion 131, thereby achieving the purpose of clamping and fitting between the pipe clamping head 12 and the pipe snap-fitting head 13.

[0033] It should be noted that in order to avoid the phenomenon of heat exchange medium leaking from between the first connecting tube 121 and the second connecting tube 132 due to assembly tolerance between the first connecting tube 121 and the second connecting tube 132, a sealing ring can be arranged between the first connecting tube 121 and the second connecting tube 132. Specifically, as shown in Figures 2 and 4, a first sealing groove 123 in which a sealing ring is embedded is provided on the outer wall of the first connecting tube 121. Under the action of the sealing ring, the sealing performance of the clamping connection between the pipe clamping head 12 and the pipe snap-fit ​​head 13 is effectively guaranteed. At the same time, during the process of adjusting the clamping position, the sealing ring is sealed between the first connecting tube 121 and the second connecting tube 132, so that the liquid cooling assembly maintains optimal sealing performance during assembly, adjustment and use, providing the best protection for the safety of the battery module and battery pack.

[0034] The unexpected effect is that since the sealing ring abuts against the first connecting tube 121 and at the same time, the sealing ring also abuts against the second connecting tube 132, there is sufficient friction between the pipe clamping head 12 and the pipe buckle head 13, so that the first connecting tube 121 and the second connecting tube 132 are not easy to move after being plugged in.

[0035] In some embodiments, specifically referring to Figures 1, 2 and 4, a slot structure 151 is provided on the card-receiving force arm 122, and a snap-fit ​​structure 152 is provided on the snap-fit ​​force-receiving portion 131. The snap-fit ​​structure 152 extends around the circumference of the second connecting tube 132, and the snap-fit ​​structure 152 is snap-fitted to the slot structure 151. In addition, in the first extension direction G of the conveying tube body 11, an adjustment space L3 is formed between the slot wall of the slot structure 151 and the snap-fit ​​structure 152.

[0036] Therefore, under the action of the adjustment space L3, the purpose of adjusting the pipe clamp head 12 and the pipe snap-fit ​​head 13 along the first extension direction G of the conveying pipe body 11 to compensate for and eliminate the accumulated errors is achieved, thereby ensuring that the two spaced liquid cooling plates 14 maintain the same spacing.

[0037] It should be noted that in addition to the above-mentioned arrangement of the card slot structure 151 on the card receiving force arm 122 and the arrangement of the snap structure 152 on the snap-fit ​​force portion 131 , the card slot structure 151 can also be arranged on the snap-fit ​​force portion 131 and the snap structure 152 can also be arranged on the snap-fit ​​force portion 131 .

[0038] It should also be noted that, specifically in conjunction with Figures 6, 7 and 8, the distance between the fixed end of the card receiving force arm 122 and the side wall of the card slot structure 151 away from the fixed end is the first spacing L1. The fixed end here is the end of the card receiving force arm 122 used to connect to the first connecting tube 121, and the slot length of the card slot structure 151 is less than or equal to the first spacing L1, so that the adjustment space L3 is more sufficient.

[0039] Specifically, please refer to Figures 4 and 6 for details. A limiting portion 153 is formed between the side of the slot structure 151 close to the fixed end and the fixed end of the card receiving force arm 122. When the snap structure 152 abuts against the limiting portion 153, the pipe snap head 12 will be able to quickly snap into position with the pipe snap head 13, thereby improving the snap connection efficiency of the liquid cooling component. At this time, the slot length of the slot structure 151 is smaller than the first spacing L1.

[0040] In some embodiments, specifically referring to Figures 7 and 8 , the distance between the tube mouth of the second connecting tube 132 and the side of the snap structure 152 away from the tube mouth is the second spacing L2, the second spacing L2 is smaller than the first spacing L1, and the adjustment spacing of the adjustment space L3 is the first spacing L1-second spacing L2, thereby better compensating for and eliminating the error accumulation in the first extension direction G of the conveying tube body 11, and better adjusting according to the production errors and assembly tolerances of different liquid cooling plates 14 to meet the tolerance requirements of the battery pack.

[0041] 4 and 6 , an extension tube head may be formed between the side of the clip structure 152 near the pipe opening and the pipe opening of the second connecting pipe 132. Furthermore, to facilitate quick and smooth engagement of the pipe clip head 12 with the pipe fastening head 13, a guide surface is provided on the side of the clip structure 152 near the extension tube head.

[0042] In some embodiments, as shown in FIG8 , the aforementioned latching lever arm 122 is a structure having elastic properties in the first extension direction G of the delivery tube body 11. For example, the latching lever arm 122 can be made of plastic to ensure elasticity. When the snap structure 152 abuts the side of the slot structure 151 near the fixed end, the latching lever arm 122 will deform. This increases the length of the latching lever arm 122 and the slot length of the slot structure 151, thereby increasing the adjustment spacing of the adjustment space L3. The first connecting tube 121, the delivery tube body 11, and the second connecting tube 132 can be made of metal to ensure sufficient structural strength, thereby making the connection between the pipe clip head 12 and the pipe fastening head 13 more secure and stable.

[0043] In some embodiments, specifically referring to Figures 1, 2 and 4, a guide branch pipe 161 is formed on the delivery pipe body 11, a branch clamping arm 162 is provided on the guide branch pipe 161, a liquid cooling connector 141 is provided on the liquid cooling connector 141, a liquid cooling snap-fit ​​portion 142 is provided, the branch clamping arm 162 snaps into the liquid cooling snap-fit ​​portion 142, and the guide branch pipe 161 is communicated with the liquid cooling connector 141, thereby achieving the purpose of connecting and fixing the liquid cooling plate 14 and the delivery pipe body 11, and the heat exchange medium inside the delivery pipe body 11 can flow through the guide branch pipe 161 and the liquid cooling connector 141 in sequence and flow to the interior of the liquid cooling plate 14, or the heat exchange medium inside the liquid cooling plate 14 can flow through the liquid cooling connector 141 and the guide branch pipe 161 in sequence and flow to the interior of the delivery pipe body 11.

[0044] In some embodiments, specifically referring to FIG. 2 and FIG. 4 , a branch adjustment groove 171 is provided on the branch clamping arm 162, and a branch clamping portion 172 is provided on the liquid cooling buckle portion 142. The branch clamping portion 172 extends around the circumference of the liquid cooling connector 141. The branch adjustment groove 171 clamps the branch clamping portion 172, and in the extension direction of the guide branch pipe 161, a compensation gap is provided between the groove wall of the branch adjustment groove 171 and the branch clamping portion 172. Under the action of the gap, the purpose of adjusting the clamping position between the guide branch pipe 161 and the liquid-cooling connector 141 in the extension direction of the guide branch pipe 161 is achieved, thereby achieving the effect of the liquid-cooling plate 14 being able to be flexibly adjusted in the extension direction of the guide branch pipe 161, that is, compensating for and eliminating the assembly tolerance of the liquid-cooling plate 14 and the battery cell 21 in the extension direction of the guide branch pipe 161, so that each battery cell 21 can be more compactly fitted with the heat exchange contact surface 143 of the liquid-cooling plate 14.

[0045] It should be noted that in addition to providing the branch adjustment groove 171 on the branch clamping arm 162 and the branch clamping portion 172 on the liquid cooling buckle portion 142, it is also possible to provide the branch clamping portion 172 on the branch clamping arm 162 and the branch adjustment groove 171 on the liquid cooling buckle portion 142.

[0046] It should also be noted that to prevent leakage of heat exchange medium between the branch pipe 161 and the liquid-cooling connector 141, at least one seal 19 may be optionally disposed between the branch pipe 161 and the liquid-cooling connector 141. Specifically, as shown in FIG4 , a second sealing groove is provided on the outer wall of the branch pipe 161, into which the seal 19 is embedded. The seal 19 effectively ensures the tightness of the connection between the branch pipe 161 and the liquid-cooling connector 141.

[0047] In some embodiments, specifically in conjunction with Figures 1 and 3, the liquid cooling assembly also includes a pipe external connector 18, which includes an external pipe body 181, an external branch pipe 182 connected to the external pipe body 181, and an external snap head 183 arranged at the end of the external pipe body 181. The external snap head 183 can snap into the pipe snap head 12.

[0048] Specifically, external snap-fitting head 183 is provided with an external snap-fitting portion that extends around the circumference of external snap-fitting head 183 and snaps into place within slot structure 151 of pipe snap-fitting head 12, thereby securing external snap-fitting head 183 to pipe snap-fitting head 12 on delivery pipe body 11. Furthermore, external heat exchange medium flows sequentially through external branch pipe 182, external pipe body 181, and delivery pipe body 11, thereby guiding the external heat exchange medium to delivery pipe body 11 of the liquid-cooling assembly and stably supplying it to the liquid-cooling plate 14 of the liquid-cooling assembly.

[0049] In some embodiments, a circumscribed gap may be optionally provided between the groove wall of the slot structure 151 and the externally engaging portion in the first extension direction G of the delivery tube body 11. This circumscribed gap allows the engagement position between the delivery tube body 11 and the external tube body 181 to be adjusted in the first extension direction G of the delivery tube body 11, effectively compensating for or eliminating assembly tolerances between the delivery tube body 11 and the external tube body 181 in the first extension direction G of the delivery tube body 11.

[0050] It should be noted that, in addition to being clamped to the pipe clamping head 12 , the external clamping head 183 can also be clamped to the pipe buckle head 13 .

[0051] It should also be noted that the above-mentioned liquid cooling plate 14 has a plurality of fluid channels inside, and the plurality of fluid channels are evenly arranged, and two adjacent fluid channels are connected end to end to form a serpentine channel. In this way, after the heat exchange medium flows into the serpentine channel, it will flow from top to bottom or from bottom to top along the direction of arrangement of the plurality of fluid channels, which is equivalent to the heat exchange medium flowing from bottom to top or from top to bottom along the height direction of the battery cell 21. This increases the flow distance of the heat exchange medium in the liquid cooling plate 14, greatly increases the heat exchange time between the heat exchange medium and the battery cell 21, and thus effectively improves the utilization rate of the heat exchange medium.

[0052] In some embodiments, specifically as shown in FIG2 , the liquid cooling plate 14 includes a main collector 144 having a main manifold, a slave collector having a slave manifold, and a liquid cooling plate body 145 having a plurality of fluid channels. The main collector 144 and the slave collector are respectively connected to the ends of the liquid cooling plate body 145, and the plurality of fluid channels are connected end to end through the main manifold and the slave manifold to form a serpentine channel. The connection method here can be found in the heat exchange assembly, battery module, and battery pack for a battery disclosed in the authorization announcement No. CN219066953U on May 23, 2023.

[0053] Based on the structure and connection relationship of the battery module, an embodiment of the present application also discloses a battery pack, including the battery module provided by the embodiment of the present application.

Claims

1. A liquid cooling assembly, comprising a plurality of liquid cooling units (1) arranged at intervals, each of the liquid cooling units (1) comprising a delivery pipe body (11), a pipe clamping head (12), a pipe buckling head (13), and a liquid cooling plate (14) movably connected to the delivery pipe body (11), the pipe clamping head (12) and the pipe buckling head (13) being respectively arranged at two ends of the delivery pipe body (11); The pipe clamping head (12) of the liquid cooling unit (1) is engaged with the pipe buckling head (13) of the adjacent liquid cooling unit (1), so that the two adjacent conveying pipe bodies (11) are connected.

2. The liquid cooling assembly according to claim 1, wherein: The pipe buckle head (13) can be movably adjusted with the pipe clamping head (12) in the first extension direction G of the delivery pipe body (11), so that two adjacent liquid cooling plates (14) are kept spaced apart.

3. The liquid cooling assembly according to claim 1 or 2, wherein: The pipeline clamping head (12) comprises a first connecting tube (121) and a clamping force receiving arm (122) arranged outside the first connecting tube (121); the pipeline locking head (13) comprises a second connecting tube (132) and a clamping force receiving portion (131) arranged on the second connecting tube (132); the first connecting tube (121) is plugged into the second connecting tube (132), and the clamping force receiving arm (122) is clamped into the clamping force receiving portion (131).

4. The liquid cooling assembly according to claim 3, wherein: One of the card-receiving force arm (122) and the buckling force-bearing portion (131) is provided with a card slot structure (151), and the other of the card-receiving force arm (122) and the buckling force-bearing portion (131) is provided with a buckle structure (152). The buckle structure (152) is buckled in the card slot structure (151), and in the first extension direction G of the conveying tube body (11), an adjustment space L3 is formed between the groove wall of the card slot structure (151) and the buckle structure (152).

5. The liquid cooling assembly according to claim 4, wherein: The distance between the fixed end of the card receiving force arm (122) and a side wall of the card slot structure (151) away from the fixed end is a first spacing L1, and the slot length of the card slot structure (151) is less than or equal to the first spacing L1.

6. The liquid cooling assembly according to claim 5, wherein: The distance between the pipe mouth of the second connecting pipe (132) and the side of the buckle structure (152) away from the pipe mouth is a second spacing L2, the second spacing L2 is smaller than the first spacing L1, and the adjustment spacing of the adjustment space L3 is the first spacing L1-the second spacing L2.

7. The liquid cooling assembly according to claim 4, 5 or 6, wherein: The clamping force receiving arm (122) is a structure having elastic properties in the first extension direction G of the conveying tube body (11).

8. The liquid cooling assembly according to claim 1 or 2 or 4 or 5 or 6, wherein: A flow guide branch pipe (161) is formed on the conveying pipe body (11), and a branch clamping arm (162) is provided on the flow guide branch pipe (161). The liquid cooling plate (14) has a liquid cooling connector (141), and a liquid cooling buckling portion (142) is provided on the liquid cooling connector (141). The branch clamping arm (162) buckles with the liquid cooling buckling portion (142), and the flow guide branch pipe (161) is connected to the liquid cooling connector (141).

9. The liquid cooling assembly according to claim 8, wherein: One of the branch clamping arm (162) and the liquid cooling buckle part (142) is provided with a branch adjustment groove (171), and the other of the branch clamping arm (162) and the liquid cooling buckle part (142) is provided with a branch buckle part (172); the branch adjustment groove (171) is clamped with the branch buckle part (172), and in the extension direction of the guide branch pipe (161), a compensating gap is provided between the groove wall of the branch adjustment groove (171) and the branch buckle part (172).

10. The liquid cooling assembly according to claim 8, wherein: The liquid cooling plate (14) has a plurality of fluid channels inside, the plurality of fluid channels are evenly arranged, and two adjacent fluid channels are connected end to end to form a serpentine channel.

11. The liquid cooling assembly according to claim 10, wherein: The liquid cooling plate (14) comprises a main current collector (144) having a main current collecting cavity therein, a secondary current collector having a secondary current collecting cavity therein, and a liquid cooling plate body (145) provided with a plurality of the fluid channels, the main current collector (144) and the secondary current collector being respectively connected to two ends of the liquid cooling plate body (145), and the plurality of the fluid channels being connected end to end through the main current collecting cavity and the secondary current collecting cavity to form the serpentine channel.

12. The liquid cooling component according to claim 1 or 2 or 4 or 5 or 6 further includes a pipe external connector (18), the pipe external connector (18) including an external pipe body (181), an external branch pipe (182) connected to the external pipe body (181), and an external snap-fit ​​head (183) arranged at the end of the external pipe body (181), the external snap-fit ​​head (183) being capable of snapping the pipe snap-fit ​​head (12) or the pipe snap-fit ​​head (13).

13. A battery module, comprising: The liquid cooling assembly according to any one of claims 1 to 12; A battery pack, the battery pack having a plurality of rows of battery units (2), the battery units (2) having a plurality of battery cells (21), the plurality of battery cells (21) being arranged along the length direction of a liquid cooling plate (14) of the liquid cooling assembly, each of the battery units (2) being arranged between two of the liquid cooling plates (14), and each of the battery cells (21) being capable of heat exchange with the liquid cooling plate (14).

14. A battery pack comprising the battery module according to claim 13.

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