Liquid cooling assembly and battery pack

Abstract

The present application 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 main pipe. An installation space for installing a heating element is formed between every two adjacent liquid cooling plates. Each liquid cooling plate comprises a flow channel portion and nozzles in communication with the flow channel portion. The main pipe comprises a plurality of connectors, and the plurality of connectors are expanded and connected to the plurality of nozzles in one-to-one correspondence. Each connector is inserted into the corresponding nozzle, an inner wall of the connector is provided with a support ring, and the support ring overlaps with the nozzle.

Description

Liquid cooling components and battery pack

[0001] This application claims priority to Chinese Patent Application No. 202423220509.5, filed with the Chinese Patent Office on December 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a liquid cooling component and battery pack. Background Technology

[0003] In related technologies, liquid cooling components can be applied between heat-generating elements to reduce their temperature. These heat-generating elements can be batteries, etc. A liquid cooling component includes a liquid cooling plate and pipes connected to it. Due to the compact structure between adjacent liquid cooling plates, the connection between the pipes and the liquid cooling plates is relatively difficult. Corrugated pipe expansion joints are typically used in liquid cooling components to achieve the connection between the pipes and the liquid cooling plates. Invention Overview

[0004] Because the pipes, corrugated pipes, and liquid cooling plates all have material tolerances, and there are assembly tolerances after the pipes, corrugated pipes, and liquid cooling plates are assembled, the connection reliability between the pipes and the liquid cooling plates is poor, which easily leads to leakage and affects the cooling effect of the liquid cooling components.

[0005] Therefore, it is urgent to address the aforementioned shortcomings.

[0006] This application provides a liquid cooling assembly. The liquid cooling assembly includes:

[0007] Multiple spaced liquid cooling plates are arranged at intervals, and an installation space for installing a heating element is formed between two adjacent liquid cooling plates. Each liquid cooling plate includes a flow channel and a nozzle communicating with the flow channel.

[0008] The main pipe includes multiple connectors, which are expanded to correspond one-to-one with multiple nozzles. The connectors are inserted into the nozzles, and the inner wall of the connectors is provided with a support ring. The support ring overlaps with the nozzles, and the elastic modulus of the support ring is greater than that of the connector.

[0009] This application also provides a battery pack. The battery pack includes the above-described liquid cooling assembly, and the heating element is a battery. Beneficial effects

[0010] The liquid cooling assembly provided in this application improves the shortcomings of poor connection reliability between the connector and the liquid cooling plate, which easily leads to leakage and affects the cooling effect of the liquid cooling assembly. By setting a support ring on the inner wall of the connector and making the elastic modulus of the support ring greater than that of the connector, the support ring is less prone to deformation than the connector, preventing the connector from being crushed after insertion and causing leakage.

[0011] The battery pack provided in this application uses the above-mentioned liquid cooling component, with the battery as the heating element. By setting a support ring on the inner wall of the connector and making the elastic modulus of the support ring greater than that of the connector, the support ring is less prone to deformation than the connector, preventing the connector from being crushed after insertion and causing leakage. This improves the defect of poor connection reliability between the connector and the liquid cooling plate, which is prone to leakage and affects the cooling effect of the liquid cooling component. Attached Figure Description

[0012] Figure 1 is a perspective view of a liquid cooling assembly provided in a possible implementation of this application.

[0013] Figure 2 is a schematic diagram of the liquid cooling plate in Figure 1.

[0014] Figure 3 is a three-dimensional schematic diagram of a partial structure in Figure 1.

[0015] Figure 4 is a disassembled diagram of a partial structure in Figure 3.

[0016] Figure 5 is a top view of a partial structure in Figure 3.

[0017] Figure 6 is a schematic diagram of the cross-sectional structure at point AA in Figure 5.

[0018] Figure 7 is a partial structural diagram of the main body in Figure 1.

[0019] Figure 8 is a schematic diagram of the battery pack structure provided by a possible implementation of this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] Liquid cooling component 1; heating element 2;

[0022] Liquid cooling plate 10, nozzle 11, boss 111, flow channel 12;

[0023] Main tube 20, connector 21, connecting part 211, protrusion 212, support ring 22, body part 23, support arm 231, slot 231a, buckle 232, limiting structure 2321, sub-tube 25, first connector 251, claw 2511, sealing ring 2512, second connector 252, flange 2521;

[0024] The distance L1 between the surfaces of the boss 111 and the buckle 232 that are close to each other, and the distance L2 between the end of the second connector 252 and the root of the claw 2511 in the connection direction between the second connector 252 and the first connector 251.

[0025] Battery pack 3. Embodiments of the present invention

[0026] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0029] In a first aspect, as shown in Figures 1 to 7, an embodiment of this application provides a liquid cooling assembly 1. The liquid cooling assembly 1 includes a plurality of spaced liquid cooling plates 10 and a main pipe 20. An installation space is formed between two adjacent liquid cooling plates 10 for mounting a heating element 2. Each liquid cooling plate 10 includes a flow channel 12 and a nozzle 11 communicating with the flow channel 12. The main pipe 20 includes a plurality of connectors 21, which are expanded to correspond one-to-one with the plurality of nozzles 11. The connectors 21 are inserted into the nozzles 11. A support ring 22 is provided on the inner wall of the connector 21. The support ring 22 overlaps with the nozzle 11. The elastic modulus of the support ring 22 is greater than that of the connector 21.

[0030] The shape of the liquid cooling plate 10 can be adaptively adjusted according to the shape of the heating element 2. As shown in Figures 1 and 2, when the heating element 2 is a cylindrical battery, the liquid cooling plate 10 can be a serpentine plate. The serpentine plate includes multiple connected arc surfaces, and one arc surface can match the outer surface of a cylindrical battery, thereby increasing the contact area between the serpentine plate and the cylindrical battery and improving the cooling effect.

[0031] When the heating element 2 is a square electrode, the liquid cooling plate 10 can be a flat plate with a planar surface, thus matching the surface of the square electrode and increasing the contact area between the plate and the square battery. When the heating element 2 has other shapes, the shape of the liquid cooling plate 10 can also match the outer surface of the heating element 2. This application does not limit the shape of the liquid cooling plate 10.

[0032] The flow channel 12 has a flow channel inside, and the coolant can flow along the flow channel to carry away the heat generated by the heating element 2, thereby achieving temperature uniformity and cooling effect.

[0033] As shown in Figures 1 and 2, one end of the flow channel 12 can be provided with two nozzles 11, one for liquid inlet and the other for liquid outlet. Each nozzle 11 is a hollow tubular structure. Coolant can flow into the flow channel within the flow channel 12 through the pipe inside one nozzle 11, circulate within the flow channel, and then flow out along the other nozzle 11. The dashed arrow in Figure 2 shows the flow path of the coolant; the flow path between the two nozzles 11 is U-shaped. This design reduces the flow resistance in the liquid cooling assembly 1, saving space. Simultaneously, a single liquid cooling plate 10 can achieve temperature neutralization, reducing the temperature difference of the corresponding heat-generating element 2 along the length of the same liquid cooling plate 10.

[0034] Optionally, in other embodiments, a nozzle 11 is provided at each end of the flow channel 12. Coolant flows into the flow channel of the flow channel 12 through one nozzle 11 and flows out through the other nozzle 11. The flow path of the coolant is a unidirectional line from one end of the flow channel 12 to the other end.

[0035] As shown in Figures 1 and 3, the main pipe 20 includes at least one connector 21, which is expanded to correspond one-to-one with the nozzle 11. The number of connectors 21 is equal to the number of nozzles 11. The connector 21 is a hollow tubular structure, through which coolant flows via the pipes inside the connector 21, the pipes inside the nozzle 11, and the flow channel of the flow passage 12. The main pipe 20 can be at least one of an inlet pipe or a return pipe.

[0036] The connector 21 and the nozzle 11 are expanded together. Expansion refers to applying radial pressure to the connector 21 and nozzle 11 through plastic deformation, thereby achieving sufficient connection strength and sealing reliability. For example, the connector 21 can be made of a flexible material, which is flexible and can undergo plastic deformation under stress. The connector 21 and nozzle 11 can be interference-fitted, causing the flexible material to be compressed, thereby achieving sufficient connection strength and sealing reliability.

[0037] Optionally, in some embodiments, the material of the connector 21 can be a flexible material such as ethylene propylene rubber (EPDM), thermoplastic elastomer (TPE), or thermoplastic polyurethane (TPU).

[0038] The connector 21 is inserted into the nozzle 11, meaning that at the insertion point, the connector 21 is located inside the nozzle 11. The support ring 22 overlaps with the nozzle 11, meaning that the nozzle 11 is fitted around the support ring 22. Because the elastic modulus of the support ring 22 is greater than that of the connector 21, when the connector 21 is inserted into the nozzle 11, the support ring 22 is less prone to deformation than the connector 21, meaning the connector 21 is less likely to be crushed. This prevents leakage at the connection between the connector 21 and the nozzle 11, thus avoiding affecting the cooling effect of the liquid cooling assembly 1. The elastic modulus is the ratio of stress to strain. The larger the elastic modulus, the less easily the material deforms; the smaller the elastic modulus, the more easily the material deforms.

[0039] The support ring 22 can be made of a metal or other non-deformable material. The support ring 22 can be made of copper, iron, steel, etc., but is not limited to these materials.

[0040] In some embodiments, as shown in FIG4, the main pipe 20 includes a body portion 23 and a connector 21 connected to the body portion 23, wherein the elastic modulus of the connector 21 is less than the elastic modulus of the body portion 23.

[0041] The materials of the body 23 and the connector 21 can be different. The elastic modulus of the connector 21 is less than that of the body 23, which means that the connector 21 is more easily deformed than the body 23, thus allowing it to be expanded and connected to the nozzle 11. On the other hand, the body 23 is less easily deformed than the connector 21, meaning that the body 23 has higher mechanical strength and is more robust and durable.

[0042] Optionally, the body part 23 can be made of polyhexamethylene adipamide (PA66), polyphenylene sulfide (PPS), modified polyphenylene ether (PPE), polypropylene terephthalate (PPA), etc.

[0043] In some embodiments, as shown in Figures 6 and 7, the connector 21 includes a connecting portion 211 and a protrusion 212 disposed adjacent to each other. The protrusion 212 is disposed at the end of the connecting portion 211 away from the body portion 23, and the support ring 22 is correspondingly disposed on the inner wall of the protrusion 212. The outer diameter of the protrusion 212 is larger than the outer diameter of the connecting portion 211.

[0044] As shown in Figure 6, the connecting portion 211 and the protrusion 212 can be made of the same material. The protrusion 212 is located near the opening end of the connector 21, and the connecting portion 211 connects the protrusion 212 to the body portion 23. The support ring 22 is nested in the inner wall of the protrusion 212, and the width of the support ring 22 can be less than or equal to the width of the protrusion 212, where the width refers to the dimension in the direction of the axis of the connector 21.

[0045] Optionally, as shown in Figure 6, the surface of the support ring 22 near the opening of the connector 21 is flush with the surface of the protrusion 212 near the opening of the connector 21, thereby enhancing the mechanical strength of the protrusion 212 and preventing the connector 21 from being crushed during the insertion process.

[0046] In some embodiments, as shown in FIG6, the inner diameter of the nozzle 11 is a first dimension a, and the outer diameter of the protrusion 212 is a second dimension b; wherein, 0.2≤(ba) / a≤0.9.

[0047] To ensure a tight fit between the nozzle 11 and the protrusion 212, the nozzle 11 and the protrusion 212 are designed with an interference fit. An interference fit means that the inner diameter of the nozzle 11 is smaller than the outer diameter of the protrusion 212, so that after insertion, the nozzle 11 and the protrusion 212 are tightly connected to prevent leakage.

[0048] Optionally, in order to ensure the assembly tolerance between the convex part 212 and the nozzle 11, the outer diameter of the convex part 212 and the inner diameter of the nozzle 11 shall satisfy the relationship 0.2≤(ba) / a≤0.9.

[0049] It should be noted that the inner diameter of the nozzle 11 can be a uniform size, meaning that the inner diameter of the nozzle 11 is the same at any point in the insertion direction. The outer diameter of the protrusion 212 can be a non-uniform size, meaning that the outer diameter of the protrusion 212 is different at at least two points in the insertion direction. For example, in the insertion direction between the nozzle 11 and the connector 21, the outer diameter of the end of the protrusion 212 away from the body portion 23 is smaller than the outer diameter of the end of the protrusion 212 closer to the body portion 23. By the above arrangement, the size of the end of the protrusion 212 away from the body portion 23 can be reduced, thereby making it easier for the protrusion 212 to be inserted into the nozzle 11.

[0050] In some embodiments, as shown in Figures 4 to 6, the body portion 23 is provided with support arms 231 located on opposite sides of the connector 21. A slot 231a is provided on the surface of the support arms 231 facing away from each other. The main tube 20 also includes a buckle 232 that engages with the slot 231a. The buckle 232 is provided around the connector 21. A boss 111 is provided at the end of the nozzle 11 away from the flow channel portion 12. The buckle 232 is provided on the side of the boss 111 near the flow channel portion 12. A limiting structure 2321 is provided on the surface of the buckle 232 near the axis of the connector 21. The limiting structure 2321 is configured to prevent the boss 111 from moving away from the body portion 23 in the insertion direction.

[0051] As shown in Figure 4, the support arm 231 is disposed on the outer wall of the body portion 23 and extends in a direction away from the body portion 23. One support arm 231 is disposed on each of the opposite sides of the connector 21. The support arms 231 are spaced apart from the connector 21 to avoid interference between the support arms 231 and the nozzle 11, thus preventing interference with the insertion of the connector 21 and the nozzle 11.

[0052] As shown in Figure 5, two support arms 231 located on opposite sides of the same connector 21 are arranged along the axial direction of the main body 23. When the main pipe 20 is molded using injection molding, the support arms 231 arranged along the axial direction of the main body 23 will not affect the demolding of the mold.

[0053] As shown in Figures 4 to 6, a slot 231a is provided on the opposite side surface of the support arm 231, which can engage with the buckle 232. The width of the slot 231a can match the width of the clip, and the slot 231a can prevent the buckle 232 from moving along the insertion direction of the connector 21 and the nozzle 11. The buckle 232 has a ring structure and surrounds the outer periphery of the connector 21. It should be noted that the slot 231a can prevent the buckle 232 from rotating around the axis of the connector 21.

[0054] As shown in Figures 4 and 6, a corresponding limiting structure 2321 is provided on the side surface of the buckle 232 near the axis of the connector 21. The limiting structure 2321 cooperates with the boss 111 to prevent the nozzle 11 from disengaging from the connector 21.

[0055] It should be understood that, in order to facilitate the insertion of the nozzle 11 into the connector 21, the limiting structure 2321 does not obstruct the movement of the nozzle 11 along the direction from the connector 21 towards the body portion 23. Specifically, the limiting structure 2321 has an inclined surface, and the distance between two opposing limiting structures 2321 increases along the direction away from the body portion 23. During insertion, the boss 111 can slide along the inclined surface of the limiting structure 2321; after insertion, the boss 111 is located on the side of the limiting structure 2321 away from the flow channel portion 12. When the nozzle 11 disengages from the connector 21 along the insertion direction, the limiting structure 2321 will interfere with the boss 111, thereby preventing the connector 21 from disengaging from the nozzle 11.

[0056] As shown in Figure 6, the boss 111 and the limiting structure 2321 can not only prevent the connector 21 from detaching from the nozzle 11, but also prevent the nozzle 11 from being improperly inserted through the cooperation of the boss 111 and the limiting structure 2321.

[0057] Optionally, to ensure assembly reliability, the distance L1 between the surfaces of the boss 111 and the limiting structure 2321 that are close to each other ranges from 0.1 mm to 20 mm. The surfaces of the boss 111 and the limiting structure 2321 that are close to each other refer to the side surface of the boss 111 that is close to the limiting structure 2321 and the side surface of the limiting structure 2321 that is close to the boss 111.

[0058] In some embodiments, as shown in Figures 1 and 7, the main tube 20 includes a plurality of separately arranged sub-tubes 25, which are connected in sequence; at least some of the sub-tubes 25 have connectors 21.

[0059] To reduce the variety of materials in the main pipe 20, the main pipe 20 can be formed by multiple sub-pipes 25 with identical structures. This reduces the variety of sub-pipes 25, facilitates material standardization, and lowers production management costs. For example, each sub-pipe 25 can include the same number of connectors 21. For example, each sub-pipe 25 can have two spaced connectors 21, in which case the sub-pipe 25 is a four-way connector 21. The sub-pipe 25 can also have other numbers of connectors 21, such as three, four, five, or six connectors 21, etc., and this application does not impose any limitations on this.

[0060] When a sub-tube 25 has two connectors 21, the structure of the sub-tube 25 is easier to process, which can reduce the manufacturing cost of the sub-tube 25. Moreover, when the sub-tube 25 has fewer connectors 21, it is easier to absorb the positional deviation between multiple liquid cooling plates 10 connected to the same sub-tube 25, reducing the assembly difficulty.

[0061] Specifically, multiple liquid cooling plates 10 can be stacked with the heating element 2, and then multiple sub-tubes 25 can be aligned with the liquid cooling plates 10 using a tooling, and then the multiple sub-tubes 25 can be synchronously inserted with the multiple liquid cooling plates 10.

[0062] In some embodiments, as shown in FIG7, each sub-tube 25 is provided with a first connector 251 at one end and a second connector 252 at the other end; the first connector 251 of one sub-tube 25 is connected to the second connector 252 of the adjacent sub-tube 25; the outer wall of the first connector 251 is provided with a claw 2511, and the outer wall of the second connector 252 is provided with a flange 2521, and the claw 2511 engages with the flange 2521.

[0063] As shown in Figure 7, the first connector 251 and the second connector 252 have different structures. The first connector 251 of one sub-tube 25 can be inserted into the second connector 252 of an adjacent sub-tube 25. After insertion, the first connector 251 is located inside the second connector 252, that is, the outer sidewall of the first connector 251 is in contact with the inner sidewall of the second connector 252. The first connector 251 and the second connector 252 have an interference fit, thereby ensuring connection strength and sealing reliability.

[0064] In one embodiment, as shown in FIG7, a groove is provided on the outer wall of the first connector 251. The groove is coaxially arranged with the first connector 251, that is, the groove is annular. The depth of the groove is less than the thickness of the outer wall of the first connector 251. A sealing ring 2512 is provided in the groove. The material of the sealing ring 2512 can be an elastic material, such as rubber. The sealing ring 2512 is sleeved on the outside of the first connector 251.

[0065] The inner wall of the second connector 252 contacts the sealing ring 2512. This means that the sealing ring 2512 is positioned between the side walls of the first connector 251 and the second connector 252. After the first connector 251 and the second connector 252 are inserted, the sealing ring 2512 is under compression. The sealing ring 2512 can absorb the tolerance between the first connector 251 and the second connector 252, ensuring connection strength and sealing reliability.

[0066] In one embodiment, as shown in FIG7, the outer wall of the first connector 251 is provided with a claw 2511, and the outer wall of the second connector 252 is provided with a flange 2521. The claw 2511 engages with the flange 2521. Two adjacent sub-tubes 25 are quickly connected to the flange 2521 via the claw 2511. After the claw 2511 engages with the flange 2521, it can prevent the second connector 252 and the first connector 251 from falling off along the connection direction.

[0067] At the same time, the relative positional relationship between the claw 2511 and the flange 2521 can be seen visually, which makes it easy to determine whether the first connector 251 and the second connector 252 are properly connected.

[0068] In some embodiments, as shown in FIG7, the distance L2 between the end of the second connector 252 and the root of the claw 2511 in the connection direction between the second connector 252 and the first connector 251 is 1 mm to 20 mm.

[0069] The connection direction between the second connector 252 and the first connector 251 refers to the axial direction of the second connector 252. Since the distance L1 between the first connector 251 and the second connector 252 in the connection direction is 1 mm to 20 mm, the distance L1 between the centers of two adjacent sub-tubes 25 can be adjusted within this range, so that the connector 21 can be better aligned with the nozzle 11, absorbing assembly tolerances, reducing assembly difficulty, and improving assembly efficiency.

[0070] It should be understood that when the distance L2 between the end of the second connector 252 and the root of the claw 2511 in the connection direction between the second connector 252 and the first connector 251 is 1 mm to 20 mm, the claw 2511 and the flange 2521 are in an engaged state, and the distance L1 between the claw 2511 and the flange 2521 is greater than or equal to 0 mm.

[0071] Secondly, as shown in FIG8, an embodiment of this application provides a battery pack, which includes the liquid cooling component 1 described above and the heating element 2 being a battery.

[0072] In this embodiment, please refer to Figure 1. The heating element 2 can be a battery, such as a circular battery or a square battery. The battery is disposed in the mounting space between two adjacent liquid cooling plates 10, which can cool the battery.

Claims

1. A liquid cooling assembly (1), comprising: Multiple 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) includes a flow channel (12) and a nozzle (11) communicating with the flow channel (12). The main pipe (20) includes multiple connectors (21), each connector (21) is connected to a multiple nozzle (11) in a one-to-one expansion joint. The connector (21) is inserted into the nozzle (11). The inner wall of the connector (21) is provided with a support ring (22), which overlaps with the nozzle (11). The elastic modulus of the support ring (22) is greater than that of the connector (21).

2. The liquid cooling assembly (1) according to claim 1, wherein The main tube (20) includes a body part (23) and a connector (21) connected to the body part (23), wherein the elastic modulus of the connector (21) is less than that of the body part (23).

3. The liquid cooling assembly (1) according to claim 2, wherein The connector (21) includes a connecting part (211) and a protrusion (212) arranged adjacent to each other. The protrusion (212) is located at the end of the connecting part (211) away from the body part (23). The support ring (22) is correspondingly arranged on the inner wall of the protrusion (212). The outer diameter of the protrusion (212) is larger than the outer diameter of the connecting part (211).

4. The liquid cooling assembly (1) according to claim 3, wherein The inner diameter of the nozzle (11) is a first dimension a, and the outer diameter of the protrusion (212) is a second dimension b; Where 0.2≤(ba) / a≤0.

9.

5. The liquid cooling assembly (1) according to any one of claims 2 to 4, wherein, The main body (23) is provided with support arms (231) located on opposite sides of the connector (21). The surface of the support arms (231) facing away from each other is provided with a slot (231a). The main tube (20) also includes a buckle (232) that engages with the slot (231a). The buckle (232) is arranged around the connector (21). The nozzle (11) is provided with a boss (111) at one end away from the flow channel (12). The buckle (232) is located on the side of the boss (111) close to the flow channel (12). The surface of the buckle (232) close to the axis of the connector (21) is provided with a limiting structure (2321). The limiting structure (2321) is configured to prevent the boss (111) from moving away from the main body (23) in the insertion direction.

6. The liquid cooling assembly (1) according to claim 5, wherein The distance (L1) between the surfaces of the boss (111) and the limiting structure (2321) that are close to each other ranges from 0.1 mm to 20 mm.

7. The liquid cooling assembly (1) according to any one of claims 1 to 4, wherein, The main tube (20) includes multiple separately arranged sub-tubes (25), which are connected in sequence; at least some of the sub-tubes (25) have the connector (21).

8. The liquid cooling assembly (1) according to claim 7, wherein Each of the sub-tubes (25) is provided with a first connector (251) at one end and a second connector (252) at the other end; the first connector (251) of one sub-tube (25) is connected to the second connector (252) of the adjacent sub-tube (25); the outer wall of the first connector (251) is provided with a claw (2511), and the outer wall of the second connector (252) is provided with a flange (2521), and the claw (2511) engages with the flange (2521).

9. The liquid cooling assembly (1) according to claim 8, wherein The distance (L2) between the end of the second connector (252) and the root of the claw (2511) in the connection direction between the second connector (252) and the first connector (251) is 1 mm to 20 mm.

10. A battery pack comprising a liquid cooling assembly (1) as described in any one of claims 1 to 9, wherein the heating element (2) is a battery.

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