Liquid cooling assembly and battery pack

Abstract

The utility model provides a liquid cooling assembly and a battery pack. The liquid cooling assembly comprises a plurality of liquid cooling plates arranged at intervals and a first main pipe, and each liquid cooling plate is provided with a first liquid guide connector; the first main pipe is provided with a first connector, a first clamping jaw is arranged on the outer wall of the first connector, a first flange is arranged on the outer wall of the first liquid guide connector, the first clamping jaw is clamped with the first flange, the distance between the first flange and the first clamping jaw in the connecting direction ranges from 1 mm to 10 mm, and the first connector is connected to the first liquid guide connector in an inserted mode. The distance between the first flange and the first clamping jaw in the connecting direction of the first connector and the first liquid guide connector is 1-10 mm, so that the relative position relation between the first clamping jaw and the first flange can be visually seen, and whether the first connector and the first liquid guide connector are in expanded connection in place or not can be conveniently judged; and the distance between the first main pipe and the liquid cooling plate can be adjusted within the range, so that the first joint is better aligned with the two first liquid guide joints, the assembly tolerance is absorbed, and the assembly difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a liquid cooling assembly and a battery pack. BACKGROUND

[0002] In related technologies, a liquid cooling assembly can be applied between heat generating bodies to reduce the temperature of the heat generating bodies, which can be batteries and the like. The liquid cooling assembly includes a liquid cooling plate and a pipeline connected with the liquid cooling plate. Since the structure between two adjacent liquid cooling plates is relatively compact, the connection between the pipeline and the liquid cooling plate is difficult to set. The connection between the pipeline and the liquid cooling plate in the liquid cooling assembly is usually realized in the form of expansion of a corrugated pipe. Since there are material tolerances of the pipeline, the corrugated pipe and the liquid cooling plate, and assembly tolerances after the pipeline, the corrugated pipe and the liquid cooling plate are assembled, the connection assembly of the pipeline and the liquid cooling plate is difficult, and the grouping efficiency is low.

[0003] Therefore, it is urgent to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a liquid cooling assembly and a battery pack, which can improve the technical problems of difficult connection assembly of the pipeline and the liquid cooling plate and low grouping efficiency.

[0005] In a first aspect, embodiments of the present application provide a liquid cooling assembly, which comprises:

[0006] A plurality of liquid cooling plates arranged at intervals, an installation space for installing a heat generating body being formed between two adjacent liquid cooling plates, each liquid cooling plate having a flow passage and a first liquid guide connector in communication with the flow passage;

[0007] A first main pipe having a plurality of first connectors, an outer wall of the first connector being provided with a first clamping jaw, an outer wall of the first liquid guide connector being provided with a first flange, the first clamping jaw being clamped with the first flange, a spacing between the first flange and the first clamping jaw in a connection direction of the first connector and the first liquid guide connector being 1-10 mm, and the first connector being inserted into the first liquid guide connector.

[0008] In an embodiment, the first liquid guide connector has a first insertion hole, an outer wall of the first connector is provided with a first groove, a first sealing ring is arranged in the first groove, and a side wall of the first insertion hole is in contact with the first sealing ring.

[0009] In an embodiment, the first main pipe includes a plurality of first sub-pipes arranged in sections, and the plurality of first sub-pipes are connected in sequence; at least part of the first sub-pipes has the first connector.

[0010] In an embodiment, one end of each of the first sub-pipes is provided with a first male joint, and the other end is provided with a first female joint; the first male joint of one first sub-pipe is connected with the first female joint of an adjacent first sub-pipe, and the first male joint is inserted into the first female joint.

[0011] In an embodiment, the outer wall of the first male joint is provided with a second groove, and the second groove is provided with a second sealing ring; the inner wall of the first female joint is in contact with the second sealing ring.

[0012] In an embodiment, the outer wall of the first male joint is provided with a second clamping jaw, and the outer wall of the first female joint is provided with a second flange; the second clamping jaw is clamped with the second flange.

[0013] In an embodiment, the distance between the end of the first female joint and the root of the second clamping jaw in the connection direction of the first female joint and the first male joint is 1-10 mm.

[0014] In an embodiment, each of the first sub-pipes has two first joints.

[0015] In an embodiment, the liquid cooling assembly comprises a second main pipe, the second main pipe comprises a second joint, each of the liquid cooling plates has a second liquid guide joint in communication with the flow channel; a plurality of the second joints are expanded and connected with a plurality of the second liquid guide joints one by one, the first liquid guide joint and the second liquid guide joint are arranged at the same end of the liquid cooling plate; the first main pipe and the second main pipe are located at the same side of the liquid cooling plate.

[0016] In a second aspect, the embodiments of the present application provide a battery pack, the battery pack comprises the liquid cooling assembly described above, and the heat generating body is a battery.

[0017] The embodiments of the present application have the following beneficial effects:

[0018] In the embodiments of the present application, by inserting the first joint into the first liquid guide joint, and the distance between the first flange and the first clamping jaw in the connection direction of the first joint and the first liquid guide joint is 1-10 mm, the relative position relationship between the first clamping jaw and the first flange can be visually observed, which is convenient for judging whether the first joint and the first liquid guide joint are expanded and connected in place, and the distance between the first main pipe and the liquid cooling plate can be adjusted within the range, so that the first joint is better aligned with the two first liquid guide joints, the assembly tolerance is absorbed, the assembly difficulty is reduced, and the assembly efficiency is improved, thereby improving the technical problems of large assembly difficulty and low assembly efficiency of the liquid cooling assembly. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] Figure 1 is a perspective structural schematic diagram of a liquid cooling assembly provided by an embodiment of the present application;

[0021] Figure 2 is Figure 1 is a top view structural schematic diagram of the liquid cooling assembly in

[0022] Figure 3 is Figure 1 is a disassembled structural schematic diagram of the first joint and the first liquid guide joint in

[0023] Figure 4 is Figure 1 is a connection structural schematic diagram of the first joint and the first liquid guide joint in

[0024] Figure 5 is Figure 4 is a cross-sectional structural schematic diagram in

[0025] Figure 6 is Figure 1 is a disassembled structural schematic diagram of two adjacent first sub-pipes in

[0026] Figure 7 is Figure 1 is a connection structural schematic diagram of two adjacent first sub-pipes in

[0027] Figure 8 is Figure 7 is a cross-sectional structural schematic diagram in

[0028] Figure 9 is Figure 1 is a side view structural schematic diagram of the liquid cooling plate in

[0029] Figure 10 is a structural schematic diagram of a battery pack provided by an embodiment of the present application.

[0030] Legend of reference signs:

[0031] liquid cooling assembly 1;

[0032] heating body 2;

[0033] liquid cooling plate 10, first liquid guide joint 12, first jack 121, first flange 122, second liquid guide joint 13;

[0034] First main tube 20, first connector 21, first groove 211, first sealing ring 212, first claw 213, first daughter tube 22, first male connector 221, second groove 2211, second sealing ring 2212, second claw 2213, first female connector 222, second flange 2221;

[0035] The distance L1 between the first connector 21 and the first liquid guide connector 12 in the connection direction, and the distance L2 between the end of the first female connector 222 and the root of the second claw 2213.

[0036] Second main pipe 30, second connector 31, second sub-pipe 32;

[0037] Battery pack 3. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] Firstly, such as Figures 1 to 9 As shown, an embodiment of this application provides a liquid cooling assembly 1, which includes a plurality of spaced liquid cooling plates 10 and a first main pipe 20. An installation space for mounting a heating element 2 is formed between two adjacent liquid cooling plates 10. Each liquid cooling plate 10 has a flow channel and a first liquid guide connector 12 communicating with the flow channel. The first main pipe 20 has a plurality of first connectors 21. The outer wall of the first connector 21 is provided with a first claw 213. The outer wall of the first liquid guide connector 12 is provided with a first flange 122. The first claw 213 engages with the first flange 122. The distance L1 between the first flange 122 and the first claw 213 in the connection direction between the first connector 21 and the first liquid guide connector 12 is 1 mm to 10 mm. The first connector 21 is inserted into the first liquid guide connector 12.

[0040] The shape of the liquid cooling plate 10 can be adaptively adjusted according to the shape of the heating element 2. For example... Figure 1 and Figure 2As shown, when the heat-generating body 2 is a cylindrical battery, the liquid cooling plate 10 can be a serpentine plate including a plurality of arc surfaces connected in sequence, and one arc surface can match the outer surface of one cylindrical battery, so as to increase the contact area of the serpentine plate and the cylindrical battery, and improve the cooling effect. When the heat-generating body 2 is a square electrode, the shape of the liquid cooling plate 10 can be a flat plate having a flat surface, so as to match the surface of the square electrode, and increase the contact area of the flat plate and the square battery. When the heat-generating body 2 is of other shapes, the shape of the liquid cooling plate 10 can also match the outer surface of the heat-generating body 2. The shape of the liquid cooling plate 10 is not limited in the present application.

[0041] The liquid cooling plate 10 has a flow channel inside, and the cooling liquid can flow along the channel, so as to take away the heat generated by the heat-generating body 2, and achieve the uniform temperature and cooling effect.

[0042] As shown in Figure 1 , Figure 2 and Figure 9 , one end of the liquid cooling plate 10 can have a first liquid guide connector 12 in communication with the flow channel, and the first liquid guide connector 12 is a tubular structure with an inner cavity. The cooling liquid can flow into the flow channel through the pipeline inside the first liquid guide connector 12. The first main pipe 20 can be at least one of the liquid inlet pipe or the liquid return pipe.

[0043] As shown in Figure 1 , Figure 3 and Figure 4 , the first main pipe 20 has a plurality of first connectors 21, and one first connector 21 corresponds to one first liquid guide connector 12 in expansion connection. The number of first connectors 21 is equal to the number of first liquid guide connectors 12. The first connector 21 is also a tubular structure with an inner cavity, and the cooling liquid flows through the pipeline inside the first connector 21, the pipeline inside the first liquid guide connector 12 and the flow channel.

[0044] The first connector 21 is inserted into the first liquid guide connector 12, that is, at the insertion position, the first connector 21 is located inside the first liquid guide connector 12.

[0045] The first connector 21 is connected to the first liquid guide connector 12 in expansion, which means that the first connector 21 and the first liquid guide connector 12 are subjected to radial pressure through plastic deformation, so as to obtain sufficient connection strength and sealing reliability. For example, one of the first connector 21 and the first liquid guide connector 12 can include a flexible material, and the flexible material can be plastically deformed under stress. The first connector 21 and the first liquid guide connector 12 can be interference fit, so that the flexible material is extruded, so as to obtain sufficient connection strength and sealing reliability.

[0046] As shown in Figure 3 and Figure 5As shown, the outer wall of the first joint 21 is provided with a first clamping jaw 213, and the outer wall of the first liquid guide joint 12 is provided with a first flange 122. The first clamping jaw 213 is clamped with the first flange 122. After the first clamping jaw 213 is clamped with the first flange 122, the first joint 21 and the first liquid guide joint 12 can be prevented from falling off in the connecting direction. At the same time, the relative positional relationship between the first clamping jaw 213 and the first flange 122 can be directly observed by visual observation, which facilitates the judgment of whether the first joint 21 and the first liquid guide joint 12 are expanded and connected in place.

[0047] The distance L1 between the first flange 122 and the first clamping jaw 213 in the connecting direction of the first joint 21 and the first liquid guide joint 12 is 1 millimeter to 10 millimeters. The connecting direction of the first joint 21 and the first liquid guide joint 12 refers to the axial direction of the first joint 21. Since the distance between the first joint 21 and the first liquid guide joint 12 in the connecting direction is 1 millimeter to 10 millimeters, the distance between the first main pipe 20 and the liquid cooling plate can be adjusted in this range, so that the first joint 21 is better aligned with the two first liquid guide joints 12, the assembly tolerance is absorbed, the assembly difficulty is reduced, and the assembly efficiency is improved.

[0048] In an embodiment, as shown in Figure 3 and Figure 5 As shown, the first liquid guide joint 12 has a first insertion hole 121, the outer wall of the first joint 21 is provided with a first recess 211, the first recess 211 is provided with a first sealing ring 212, and the side wall of the first insertion hole 121 is in contact with the first sealing ring 212.

[0049] The outer wall of the first joint 21 is provided with a first recess 211. The first recess 211 is coaxially arranged with the first joint 21, that is, the first recess 211 is annular. The depth of the first recess 211 is less than the thickness of the outer wall of the first joint 21. The first recess 211 is provided with a first sealing ring 212. The first sealing ring 212 is sleeved on the outside of the first joint 21.

[0050] The first sealing ring 212 is separately arranged with the first joint 21 and the first liquid guide joint 12. The material of the first sealing ring 212 is different from the material of the first joint 21 and the first liquid guide joint 12. The material of the first sealing ring 212 can be an elastic material such as rubber. The modulus of the material of the first sealing ring 212 is less than the modulus of the material of the first joint 21 and the first liquid guide joint 12, that is, the material of the first sealing ring 212 is more easily deformed under stress.

[0051] The inner wall of the first liquid guide connector 12 is in contact with the first sealing ring 212. That is, the first sealing ring 212 is arranged between the first connector 21 and the side wall of the first liquid guide connector 12. After the first connector 21 is inserted into the first liquid guide connector 12, the first sealing ring 212 is in a compressed state, and the first sealing ring 212 can absorb the tolerance between the first connector 21 and the first liquid guide connector 12, thereby ensuring the connection strength and sealing reliability.

[0052] In an embodiment, as shown in Figure 1 、 Figures 5 to 8 , the first main pipe 20 includes a plurality of first sub-pipes 22 arranged separately, and the plurality of first sub-pipes 22 are sequentially connected. At least part of the first sub-pipes 22 are provided with the first connector 21.

[0053] As shown in Figure 1 and Figure 2 , the first main pipe 20 includes a plurality of first sub-pipes 22 arranged separately, and the plurality of first sub-pipes 22 can be sequentially connected to form the first main pipe 20. Specifically, the first sub-pipe 22 is internally provided with a pipe, and the pipes in the plurality of first sub-pipes 22 are sequentially communicated to form a continuous channel. The side wall of at least part of the first sub-pipes 22 can be provided with the first connector 21.

[0054] In order to reduce the types of materials of the first main pipe 20, the first main pipe 20 can be formed by a plurality of first sub-pipes 22 with the same structure, so as to reduce the types of the first sub-pipes 22, facilitate the standardization of materials, and reduce the production management cost. For example, each first sub-pipe 22 can have the same number of first connectors 21. For example, each first sub-pipe 22 can have two first connectors 21 spaced apart, and at this time, the first sub-pipe 22 is a four-way connector. The first sub-pipe 22 can also have other numbers of first connectors 21, such as three, four, five, six, etc., and the present application does not limit this.

[0055] When one first sub-pipe 22 has two first connectors 21, the structure of the first sub-pipe 22 is easier to process, and the manufacturing cost of the first sub-pipe 22 can be reduced. When the first sub-pipe 22 has fewer first connectors 21, it is easier to absorb the positional deviation between the plurality of liquid cooling plates 10 connected to the same first sub-pipe 22, and the assembly difficulty is reduced.

[0056] Specifically, a plurality of liquid cooling plates 10 and heat-generating bodies 2 can be stacked, and then a plurality of first sub-pipes 22 and the liquid cooling plates 10 are aligned by means of a tool, and then the plurality of first sub-pipes 22 and the plurality of liquid cooling plates 10 are synchronously inserted.

[0057] In an embodiment, as shown in Figures 5 to 8As shown, one end of each first sub-tube 22 is provided with a first male joint 221, and the other end is provided with a first female joint 222; the first male joint 221 of one first sub-tube 22 is connected with the first female joint 222 of the adjacent other first sub-tube 22.

[0058] For the convenience of description, the joints at the two ends of the first sub-tube 22 are respectively named as the first male joint 221 and the first female joint 222, the structures of the first male joint 221 and the first female joint 222 are different, the first male joint 221 of one first sub-tube 22 can be inserted with the first female joint 222 of the adjacent other first sub-tube 22, and the first male joint 221 is inserted in the first female joint 222.

[0059] As shown, Figure 5 after the insertion, the end of the first male joint 221 is located in the insertion hole in the first female joint 222. That is, the outer side wall of the first male joint 221 is in contact with the inner side wall of the first female joint 222. The first male joint 221 is in interference fit with the first female joint 222, so as to ensure the connection strength and sealing reliability.

[0060] In an embodiment, as shown in Figure 5 and Figure 6 the outer wall of the first male joint 221 is provided with a second groove 2211. The second groove 2211 is coaxially arranged with the first male joint 221, that is, the second groove 2211 is annular. The depth of the second groove 2211 is smaller than the thickness of the outer wall of the first male joint 221. The second groove 2211 is provided with a second sealing ring 2212, and the material of the second sealing ring 2212 can be an elastic material such as rubber, etc. The second sealing ring 2212 is sleeved on the outer wall of the first male joint 221.

[0061] The inner wall of the first female joint 222 is in contact with the second sealing ring 2212. That is to say, the second sealing ring 2212 is arranged between the first male joint 221 and the side wall of the first female joint 222. After the insertion of the first male joint 221 and the first female joint 222, the second sealing ring 2212 is in a state of being pressed, and the second sealing ring 2212 can absorb the tolerance between the first male joint 221 and the first female joint 222, so as to ensure the connection strength and sealing reliability.

[0062] In an embodiment, as shown in Figure 5 , Figure 6 and Figure 7 the outer wall of the first male joint 221 is provided with a second clamping jaw 2213, the outer wall of the first female joint 222 is provided with a second flange 2221, and the second clamping jaw 2213 is clamped with the second flange 2221. The two adjacent first sub-tubes 22 are fast inserted and connected through the second clamping jaw 2213 and the second flange 2221. After the clamping of the second clamping jaw 2213 and the second flange 2221, the first female joint 222 and the first male joint 221 can be prevented from falling off along the connection direction.

[0063] At the same time, the relative position relationship between the second clamping jaw 2213 and the second flange 2221 can be directly observed by visual observation, so as to facilitate the judgment of whether the first male connector 221 and the first female connector 222 are expanded and connected in place.

[0064] In an embodiment, as shown in Figure 5 The spacing L2 between the end of the first female connector 222 and the root of the second clamping jaw 2213 in the connecting direction of the first female connector 222 and the first male connector 221 is 1-10 mm. The connecting direction of the first female connector 222 and the first male connector 221 refers to the axial direction of the first female connector 222. Since the spacing L2 between the first male connector 221 and the first female connector 222 in the connecting direction is 1-10 mm, the spacing L2 between the centers of two adjacent first sub-pipes 22 can be adjusted in this range, so that the first connector 21 is better aligned with the two first liquid guide connectors 12, the assembly tolerance is absorbed, the assembly difficulty is reduced, and the grouping efficiency is improved.

[0065] It should be understood that when the spacing L2 between the end of the first female connector 222 and the root of the second clamping jaw 2213 in the connecting direction of the first female connector 222 and the first male connector 221 is 1-10 mm, the second clamping jaw 2213 and the second flange 2221 are in the engaged state, and the spacing L2 between the second clamping jaw 2213 and the second flange 2221 is greater than or equal to 0 mm.

[0066] In an embodiment, as shown in Figure 1 and Figure 2 The liquid cooling assembly 1 includes a second main pipe 30, the second main pipe 30 includes a second connector 31, each liquid cooling plate 10 has a second liquid guide connector 13 communicating with the flow channel; a plurality of second connectors 31 are expanded and connected with a plurality of second liquid guide connectors 13 one by one, the first liquid guide connector 12 and the second liquid guide connector 13 are arranged at the same end of the liquid cooling plate 10; the first main pipe 20 and the second main pipe 30 are located at the same side of the liquid cooling plate 10. One of the first main pipe 20 and the second main pipe 30 is a liquid inlet main pipe, and the other is a liquid return main pipe.

[0067] The structure of the second main pipe 30 can be the same as that of the first main pipe 20, and the difference is that the second main pipe 30 is connected to the second liquid guide connector 13 of the liquid cooling plate 10. The second main pipe 30 includes a plurality of second connectors 31, and the arrangement of the second connectors 31 is similar to that of the first connectors 21, which will not be repeated here. The second main pipe 30 includes a plurality of second sub-pipes 32, and the arrangement of the second sub-pipes 32 is similar to that of the first sub-pipes 22, which will not be repeated here. Figure 2 In an embodiment, as shown in

[0068] In some embodiments, the second main pipe 30 and the first main pipe 20 are arranged on different sides of the liquid cooling plate 10. That is, the liquid cooling plate 10 is provided with the first liquid guide connector 12 at one end and the second liquid guide connector 13 at the other end, and the path between the first liquid guide connector 12 and the second liquid guide connector 13 of the liquid cooling plate 10 is a one-way line along the length direction of the liquid cooling plate 10.

[0069] In some embodiments, the second main pipe 30 and the first main pipe 20 can be arranged on the same side of the liquid cooling plate 10. As shown in Figure 9 , the liquid cooling plate 10 is provided with the first liquid guide connector 12 and the second liquid guide connector 13 at one end, and the path between the first liquid guide connector 12 and the second liquid guide connector 13 of the liquid cooling plate 10 is a U-shaped path. Figure 9 The arrow in the middle shows the flow direction of the cooling liquid. Through the above arrangement, the flow resistance in the liquid cooling assembly 1 can be reduced, and the occupied space of the liquid cooling assembly 1 can be saved. At the same time, one liquid cooling plate 10 can achieve the effect of temperature neutralization, reducing the temperature difference of the corresponding heat-generating body 2 in the length direction of the same liquid cooling plate 10.

[0070] In a second aspect, Figure 10 As shown in , the embodiments of the present application provide a battery pack 3, which comprises the liquid cooling assembly 1 described above, and the heat-generating body 2 is a battery.

[0071] Figure 1 In the present embodiment, please refer to Figure 10 , the heat-generating body 2 can be a battery, such as a circular battery, a square battery, etc. The battery is arranged in the mounting space between the adjacent two liquid cooling plates 10, and the liquid cooling plate 10 can cool the battery.

[0072] The above has introduced the embodiments of the present application in detail, and the specific examples have been applied in this paper to explain the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and according to the above, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A liquid cooling assembly (1), characterized in that, include: Multiple spaced liquid cooling plates (10) are arranged at intervals, and an installation space for mounting a heating element (2) is formed between two adjacent liquid cooling plates (10). Each liquid cooling plate (10) has a flow channel and a first liquid guide joint (12) communicating with the flow channel. The first main pipe (20) has a plurality of first connectors (21). The outer wall of the first connector (21) is provided with a first claw (213). The outer wall of the first liquid guide connector (12) is provided with a first flange (122). The first claw (213) engages with the first flange (122). The distance between the first flange (122) and the first claw (213) in the connection direction between the first connector (21) and the first liquid guide connector (12) is 1 mm to 10 mm. The first connector (21) is inserted into the first liquid guide connector (12).

2. The liquid cooling assembly (1) according to claim 1, characterized in that The first liquid guide connector (12) has a first insertion hole (121), the outer wall of the first connector (21) is provided with a first groove (211), a first sealing ring (212) is provided in the first groove (211), and the side wall of the first insertion hole (121) is in contact with the first sealing ring (212).

3. The liquid cooling assembly (1) according to claim 1, characterized in that The first main tube (20) includes multiple separately arranged first sub-tubes (22), and the multiple first sub-tubes (22) are connected in sequence; at least some of the first sub-tubes (22) have the first connector (21).

4. The liquid cooling assembly (1) according to claim 3, characterized in that Each of the first sub-tubes (22) is provided with a first male connector (221) at one end and a first female connector (222) at the other end; the first male connector (221) of one of the first sub-tubes (22) is connected to the first female connector (222) of the adjacent first sub-tube (22), and the first male connector (221) is inserted into the first female connector (222).

5. The liquid cooling assembly (1) according to claim 4, characterized in that The outer wall of the first male connector (221) is provided with a second groove (2211), and a second sealing ring (2212) is provided in the second groove (2211). The inner wall of the first female connector (222) is in contact with the second sealing ring (2212).

6. The liquid cooling assembly (1) according to claim 5, characterized in that The outer wall of the first male connector (221) is provided with a second claw (2213), and the outer wall of the first female connector (222) is provided with a second flange (2221). The second claw (2213) engages with the second flange (2221).

7. The liquid cooling assembly (1) according to claim 6, characterized in that The distance (L2) between the end of the first female connector (222) and the root of the second claw (2213) in the connection direction between the first female connector (222) and the first male connector (221) is 1 mm to 10 mm.

8. The liquid cooling assembly (1) according to claim 3, characterized in that Each of the first sub-tubes (22) has two first connectors (21).

9. Liquid cooling assembly (1) according to any one of claims 1 to 8, characterized in that The liquid cooling assembly (1) comprises a second main pipe (30) comprising a second joint (31), each of the liquid cooling plates (10) has a second liquid guide joint (13) communicating with the flow passage; a plurality of the second joints (31) are expanded and connected with a plurality of the second liquid guide joints (13) one by one, the first liquid guide joint (12) and the second liquid guide joint (13) are arranged at the same end of the liquid cooling plate (10); the first main pipe (20) and the second main pipe (30) are located at the same side of the liquid cooling plate (10).

10. A battery pack (3) characterized by The liquid cooling assembly (1) comprises a second main pipe (30) comprising a second joint (31), each of the liquid cooling plates (10) has a second liquid guide joint (13) communicating with the flow passage; a plurality of the second joints (31) are expanded and connected with a plurality of the second liquid guide joints (13) one by one, the first liquid guide joint (12) and the second liquid guide joint (13) are arranged at the same end of the liquid cooling plate (10); the first main pipe (20) and the second main pipe (30) are located at the same side of the liquid cooling plate (10). The liquid cooling assembly (1) comprises a second main pipe (30) comprising a second joint (31), each of the liquid cooling plates (10) has a second liquid guide joint (13) communicating with the flow passage; a plurality of the second joints (31) are expanded and connected with a plurality of the second liquid guide joints (13) one by one, the first liquid guide joint (12) and the second liquid guide joint (13) are arranged at the same end of the liquid cooling plate (10); the first main pipe (20) and the second

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