Liquid cooling system and battery pack

Abstract

The utility model discloses a liquid cooling system and a battery pack, and belongs to the technical field of batteries. The liquid cooling system comprises a liquid cooling plate and a connecting pipe, one of the liquid cooling plate and a branch pipe of the connecting pipe is provided with a first pipe joint, the other one of the liquid cooling plate and the branch pipe of the connecting pipe is provided with a second pipe joint capable of being inserted into the first pipe joint, and a sealing assembly is arranged at the matched position of the two pipe joints and comprises a flexible sealing sleeve and a rigid supporting ring embedded into the flexible sealing sleeve. The flexible sealing sleeve is provided with an inserting hole allowing the second pipe joint to be inserted, the outer side wall of the flexible sealing sleeve is in sealing fit with the inner wall of the first pipe joint, at least part of the inner wall of the inserting hole can be in sealing fit with the outer wall of the second pipe joint, and sealing connection between the flexible sealing sleeve and the second pipe joint is achieved through elastic deformation of the flexible sealing sleeve. The flexible sealing sleeve and the second pipe joint are supported and limited through the rigid supporting ring, so that the situation that the first pipe joint is broken due to the fact that the inserting force is too large is avoided.

Description

TECHNICAL FIELD

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

[0002] At present, a battery pack usually comprises a box body and a plurality of cell groups arranged in the box body, and each cell group is composed of a plurality of cylindrical cells arranged in sequence. Since the temperature directly affects the capacity, charging and discharging efficiency, safety and service life of the cylindrical cells, a liquid cooling system for heating or cooling the cylindrical cells needs to be arranged in the battery pack.

[0003] In the related art, for the cylindrical cells, a serpentine liquid cooling plate is usually used to contact the side surface of the cylindrical cell for thermal management. Specifically, a serpentine liquid cooling plate is arranged on both sides of each cell group, and the curvature of the curved surface of the serpentine liquid cooling plate is matched with the curvature of the side surface of the cylindrical cell to increase the contact area between them and improve the cooling efficiency.

[0004] However, due to the small diameter of the cylindrical cell, the arrangement between the serpentine liquid cooling plates is too compact, and there are assembly errors and material tolerances, etc. Therefore, the waterway connection between the serpentine liquid cooling plates has the problem of poor sealing reliability.

[0005] This part provides background information related to the present application, which may not be prior art. CONTENT OF THE INVENTION

[0006] The present application aims to solve or at least alleviate part or all of the above problems. To this end, the present application aims to provide a liquid cooling system and a battery pack with good sealing reliability.

[0007] In order to achieve the above-mentioned target, the present application adopts the following technical solution:

[0008] On the one hand, the present application provides a liquid cooling system, comprising a liquid cooling plate and a connecting pipe, one of the liquid cooling plate and the connecting pipe has a first pipe joint, and the other has a second pipe joint capable of being inserted into the first pipe joint, the mating part of the second pipe joint and the first pipe joint has a sealing assembly, and the sealing assembly comprises:

[0009] a flexible sealing sleeve accommodated in the first pipe joint, the flexible sealing sleeve has a plug-in hole penetrating through the thickness direction thereof, and the outer side wall of the flexible sealing sleeve is in sealing cooperation with the inner wall of the first pipe joint, and at least part of the inner wall of the plug-in hole can be in sealing cooperation with the outer wall of the second pipe joint;

[0010] a rigid support ring embedded in the flexible sealing sleeve.

[0011] As an alternative to the liquid cooling system, the flexible sealing sleeve further has an embedding groove annularly arranged around the periphery of the insertion hole, and the rigid supporting ring is contained in the embedding groove.

[0012] As an alternative to the liquid cooling system, the insertion hole is conical, the diameter of the insertion hole gradually decreases along the insertion direction of the second pipe joint, the maximum diameter of the insertion hole is greater than the diameter of the insertion part of the second pipe joint, and the minimum diameter of the insertion hole is less than the diameter of the insertion part of the second pipe joint.

[0013] As an alternative to the liquid cooling system, the end surface of the flexible sealing sleeve away from the second pipe joint has a deformation buffer groove annularly arranged around the periphery of the insertion hole.

[0014] As an alternative to the liquid cooling system, the longitudinal cross-sectional shape of the deformation buffer groove is V-shaped.

[0015] As an alternative to the liquid cooling system, the outer peripheral wall of the second pipe joint protrudes a baffle extending in the radial direction thereof, the baffle can be inserted into the first pipe joint, and the diameter of the baffle is greater than the maximum diameter of the insertion hole.

[0016] As an alternative to the liquid cooling system, the sealing assembly further includes a sealing gasket, the inner wall of the first pipe joint has a limiting groove, part of the sealing gasket is contained in the limiting groove, and the sealing gasket is located between the baffle and the flexible sealing sleeve.

[0017] As an alternative to the liquid cooling system, at least two connected connection pipes form a main pipe, each of the connection pipes includes a main pipe and a branch pipe connected at an angle and in communication with the main pipe, one of the main pipes of adjacent two connection pipes is inserted into the other, one of the outer peripheral walls has an elastic buckle, the other has a clamping protrusion matched with the elastic buckle, and the branch pipe has the first pipe joint or the second pipe joint.

[0018] As an alternative to the liquid cooling system, the elastic buckle has a first limiting surface, the clamping protrusion has a second limiting surface abutting against the first limiting surface, and the distance L1 between the first limiting surface and the connection part of the corresponding main pipe is greater than the distance L2 between the second limiting surface and the end of the corresponding main pipe.

[0019] As an alternative to the liquid cooling system, the liquid cooling system has two main pipes, one of which is used for the cooling liquid to flow into the liquid cooling plate, and the other is used for the cooling liquid in the liquid cooling plate to flow out.

[0020] In a second aspect, the application provides a battery pack, comprising a box body, a plurality of cell groups, and the liquid cooling system according to any one of the preceding aspects, the plurality of cell groups are arranged at intervals along a first direction, and each of the cell groups is provided with the liquid cooling plate on both sides thereof, and the gap between the cell groups, the liquid cooling system, and the box body is filled with the filling glue.

[0021] The application has the following beneficial effects:

[0022] The liquid cooling system, the liquid cooling plate, and the connecting pipe provided by the application have the following beneficial effects: one of the liquid cooling system, the liquid cooling plate, and the connecting pipe has a first pipe joint, the other has a second pipe joint capable of being inserted into the first pipe joint, and the matching parts of the two pipe joints have a sealing assembly, the sealing assembly comprises a flexible sealing sleeve and a rigid supporting ring embedded in the flexible sealing sleeve, the flexible sealing sleeve has an insertion hole for the second pipe joint, the outer sidewall of the flexible sealing sleeve is in sealing cooperation with the inner wall of the first pipe joint, at least part of the inner wall of the insertion hole is capable of being in sealing cooperation with the outer wall of the second pipe joint, the sealing connection between the two is realized through the elastic deformation of the flexible sealing sleeve, and the flexible sealing sleeve and the second pipe joint are supported and limited by the rigid supporting ring, so that the rupture of the first pipe joint caused by excessive insertion force is avoided.

[0023] The battery pack provided by the application has the following beneficial effects: by applying the above-mentioned liquid cooling system, good sealing reliability can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the description of the embodiments of the application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art according to the contents of the embodiments of the application and the drawings without creative labor.

[0025] Figure 1 A partial structure schematic diagram of the battery pack provided by the embodiments of the application is shown.

[0026] Figure 2 A structure schematic diagram of the battery pack provided by the embodiments of the application is shown, in which the box body and the filling glue are hidden.

[0027] Figure 3 An exploded schematic diagram of two adjacent connecting pipes provided by the embodiments of the application is shown.

[0028] Figure 4 A cross-sectional schematic diagram of two adjacent connecting pipes provided by the embodiments of the application in a connected state is shown.

[0029] Figure 5 A partial structure schematic diagram of the liquid cooling system and the cell group provided by the embodiments of the application is shown.

[0030] Figure 6 A partial cross-sectional schematic view of a liquid cooling system is shown.

[0031] Figure 7 A partial structure schematic view of a connecting pipe is shown.

[0032] Reference signs:

[0033] 100, box; 200, cylindrical battery cell; 300, liquid cooling system; 400, filling glue;

[0034] 10, main pipe; 1, connecting pipe; 11, main pipe; 12, branch pipe; 121, first pipe joint; 1211, limiting groove; 13, elastic buckle; 131, first limiting surface; 14, clamping convex; 141, second limiting surface;

[0035] 2, liquid cooling plate; 21, second pipe joint; 211, baffle;

[0036] 3, sealing assembly; 31, flexible sealing sleeve; 311, plug-in hole; 312, embedding groove; 313, deformation buffer groove; 32, rigid support ring; 33, sealing gasket. DETAILED DESCRIPTION

[0037] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0038] In this application, the terms "comprise", "contain", "have" or any other variant thereof are intended to cover non-exclusive inclusions, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0039] In this application, the term "and / or", is a description of the association relationship between the associated objects, which means that there can be three kinds of relationships. For example, A and / or B, can represent the following three cases: A exists alone, A and B exist together, B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects are in a "and / or" relationship.

[0040] In this application, the terms "connected", "coupled", "engage", "engagement", "attached" can be direct connection, coupling or engagement, or indirect connection, coupling or engagement through an intermediate part. For example, direct connection refers to two parts or components connected together without an intermediate part, and indirect connection refers to two parts or components connected to at least one intermediate part, and the two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0041] In this application, those of ordinary skill in the art will understand that the relative terms used in connection with quantities or conditions (for example, "about", "approximately", "substantially" and the like) include the values described and have the meaning indicated by the context. For example, the relative terms at least include the degree of error related to the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. related to a specific value. Such terms should also be considered to disclose the range defined by the absolute values of the two endpoints. The relative terms can refer to the indicated value plus or minus a certain percentage (for example, 1%, 5%, 10% or more). The numerical value without the relative term should also be disclosed as a specific value with a tolerance. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to plus or minus a certain degree (for example, 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0042] In this application, those of ordinary skill in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0043] In this application, the terms "up", "down", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the application. In addition, it should also be understood in the context that when referring to one element connected to another element "up" or "down", it can not only be directly connected to another element "up" or "down", but also indirectly connected to another element "up" or "down" through an intermediate element. It should also be understood that the terms "up", "down", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below and back below, etc.

[0044] Figure 1 A partial structure schematic diagram of a battery pack provided by an embodiment of the application is shown. As shown in FIG. 1, the battery pack includes a battery pack body 1, a plurality of battery cells 2 arranged in the battery pack body 1, and a plurality of busbars 3 arranged in the battery pack body 1. Figure 1As shown, the battery pack includes a box body 100, a plurality of cell groups, and a liquid cooling system 300. The plurality of cell groups are arranged at intervals along a first direction. Each cell group is composed of a plurality of cylindrical cells 200 arranged along a second direction. The liquid cooling system 300 is used to cool the cylindrical cells 200 in each cell group, so as to provide a suitable ambient temperature for the cylindrical cells 200, and ensure the capacity, charging and discharging efficiency, safety, and service life of the cylindrical cells 200.

[0045] In addition, the gap between the cell group, the liquid cooling system 300, and the box body 100 is filled with filling glue 400. The filling glue 400 is used to fix the cell group and the liquid cooling system 300 in the box body 100, and can also fix the cell group and the liquid cooling system 300 themselves, thereby improving the safety of the entire battery pack. For example, the filling glue 400 can be foaming glue. The foaming glue can not only enhance the structural strength of the entire battery pack, achieve thermal runaway insulation effect between the cylindrical cells 200, prevent heat spread, but also ensure the reliability of the liquid cooling system 300.

[0046] Figure 2 A structural schematic diagram of the battery pack provided by the embodiment of the present application is shown, in which the box body 100 and the filling glue 400 are hidden. Figure 2 In combination with Figure 1 As shown, the liquid cooling system 300 includes a liquid cooling plate 2 and a main pipe 10. The two sides of each cell group are provided with the liquid cooling plate 2. The plurality of liquid cooling plates 2 are connected in parallel through the main pipe 10, which can greatly reduce the fluid resistance of the liquid cooling system 300 and improve the cooling effect.

[0047] In the embodiment, the shape of the liquid cooling plate 2 is serpentine. The curvature of the curved surface of the serpentine liquid cooling plate 2 is matched with the curvature of the side surface of the cylindrical cell 200, so as to increase the contact area between the two, improve the cooling efficiency, reduce the pressure drop of the liquid cooling system 300, and cope with the heat generated by higher fast charging rate.

[0048] Further, the main pipe 10 is spliced by a plurality of connecting pipes 1. When the liquid cooling system 300 is assembled, the connecting pipe 1 can be assembled with the liquid cooling plate 2 first, and then the connecting pipe 1 can be assembled with the connecting pipe 1, which can improve the assembly efficiency of the liquid cooling system 300.

[0049] Figure 3 An exploded schematic diagram of two adjacent connecting pipes 1 provided by the embodiment of the present application is shown. Figure 4 A cross-sectional schematic diagram of the two adjacent connecting pipes 1 in a connected state provided by the embodiment of the present application is shown. Figures 3 to 4As shown, each connecting pipe 1 comprises a main pipe 11 and a branch pipe 12 connected with the main pipe 11 at an angle, and two adjacent connecting pipes 1 are connected quickly by inserting the main pipes 11. The branch pipe 12 is used to connect with the liquid cooling plate 2. For example, the branch pipe 12 can be connected with the main pipe 11 perpendicularly, or at an acute angle or an obtuse angle, which can be designed according to the needs.

[0050] In the embodiment, each connecting pipe 1 can have one or two branch pipes 12, which can improve the flexibility of the assembly of the connecting pipes 1 and reduce the probability that the total pipe 10 and the liquid cooling plate 2 cannot be assembled due to assembly or processing errors.

[0051] The outer circumferential wall of one of the main pipes 11 of the two adjacent connecting pipes 1 has an elastic buckle 13, and the outer circumferential wall of the other main pipe 11 has a clamping protrusion 14 matched with the elastic buckle 13. The matching part between the two main pipes 11 is also provided with a sealing ring, which can realize the sealed connection between the two main pipes 11 and avoid the leakage of the cooling liquid from the connection part. Further, the outer wall of one of the main pipes 11 has a groove for accommodating the sealing ring, which can realize the positioning and installation of the sealing ring and avoid the dislocation of the sealing ring during the insertion of the two main pipes 11, so as to ensure the sealing effect of the sealing ring.

[0052] In addition, the elastic buckle 13 has a first limiting surface 131, the clamping protrusion 14 has a second limiting surface 141 abutting against the first limiting surface 131, and the distance L1 between the first limiting surface 131 and the connection part of the elastic buckle 13 and the corresponding main pipe 11 is greater than the distance L2 between the second limiting surface 141 and the end of the corresponding main pipe 11. In this way, the two adjacent main pipes 11 have a degree of freedom in the first direction, which can reduce the probability that the two adjacent connecting pipes 1 cannot be assembled with the corresponding liquid cooling plate 2 due to processing errors.

[0053] In an embodiment, the difference between L1 and L2 can be any value between 1mm and 20mm, which can compensate for the assembly error between the branch pipe 12 of the connecting pipe 1 and the corresponding liquid cooling plate 2, facilitate the quick and accurate assembly of the liquid cooling system 300, and improve the assembly effect and efficiency.

[0054] The clamping protrusion 14 is preferably annular to facilitate the limiting cooperation with any number of elastic buckles 13. In the embodiment, the number of elastic buckles 13 is two, and the two elastic buckles 13 are symmetrically connected to the outer wall of the connecting pipe 1, which can reduce the processing difficulty and material cost while ensuring the connection strength of the two connecting pipes 1.

[0055] Figure 5A partial structure schematic diagram of the liquid cooling system 300 and the battery cell group provided by the embodiment of the present application is shown. Figure 6 A partial cross-sectional schematic diagram of the liquid cooling system 300 provided by the embodiment of the present application is shown. Figures 5 to 6 As shown, the flow channel in the liquid cooling plate 2 is in a U shape, wherein one branch of the U shape is the liquid inlet flow channel, and the other branch of the U shape is the liquid outlet flow channel. The liquid cooling plate 2 has two pipe joints at the same end, and the two pipe joints are respectively connected with the liquid inlet flow channel and the liquid outlet flow channel. Designing the liquid inlet and outlet pipe joints of the liquid cooling plate 2 on the same side of the liquid cooling plate 2 can save the space occupied by the whole liquid cooling system 300 in the box 100, and improve the space utilization rate of the battery pack. In addition, the U-shaped flow channel in the single liquid cooling plate 2 can also play a role in neutralizing the temperature of the cooling liquid in the single liquid cooling plate 2, and reducing the temperature difference between different cylindrical battery cells 200 in the length direction of the single liquid cooling plate 2.

[0056] Further, the number of the main pipes 10 is two, wherein one main pipe 10 (specifically, the branch pipe 12 connected with the connecting pipe 1) is connected with one pipe joint of the liquid cooling plate 2, and is used for supplying the cooling liquid into the liquid cooling plate 2, and the other main pipe 10 (specifically, the branch pipe 12 connected with the connecting pipe 1) is connected with the other pipe joint of the liquid cooling plate 2, and is used for supplying the cooling liquid in the liquid cooling plate 2 to flow out, so as to realize the circulating flow of the cooling liquid in the liquid cooling plate 2, and improve the thermal management efficiency of the liquid cooling plate 2. In order to facilitate the connection between the branch pipe 12 and the pipe joint of the liquid cooling plate 2, the branch pipe 12 also has a pipe joint, and the pipe joint of the branch pipe 12 and one of the pipe joints of the liquid cooling plate 2 are inserted into the other, so as to realize the quick plug-in connection. Further, the matching parts between the pipe joints are provided with the sealing assembly 3, which can not only improve the sealing between the two pipe joints, but also can avoid the situation that the pipe joints are broken due to excessive plug-in force.

[0057] It can be understood that the connection scheme of the pipe joint of the branch pipe 12 and the pipe joint of the liquid cooling plate 2 can be that the pipe joint of the branch pipe 12 is inserted into the pipe joint of the liquid cooling plate 2, or the pipe joint of the liquid cooling plate 2 is inserted into the pipe joint of the branch pipe 12. In order to facilitate the description, the pipe joint for inserting the other pipe joint is recorded as the first pipe joint 121, and the pipe joint inserted into the first pipe joint 121 is recorded as the second pipe joint 21.

[0058] Figure 7 A partial structure schematic diagram of the connecting pipe 1 provided by the embodiment of the present application is shown. Figure 7 Combined with Figure 6As shown, the sealing assembly 3 comprises a flexible sealing sleeve 31 and a rigid supporting ring 32. The flexible sealing sleeve 31 is accommodated in the first pipe joint 121, and the outer wall of the flexible sealing sleeve 31 is in sealing cooperation with the inner wall of the first pipe joint 121. The flexible sealing sleeve 31 has a plug-in hole 311 penetrating through the thickness direction thereof, and the second pipe joint 21 is inserted into the plug-in hole 311. At least part of the inner wall of the plug-in hole 311 can be in sealing cooperation with the outer wall of the second pipe joint 21. The flexible sealing sleeve 31 further has an embedding groove 312 arranged around the plug-in hole 311, and the rigid supporting ring 32 is accommodated in the embedding groove 312. When the second pipe joint 21 is inserted into the plug-in hole 311 of the flexible sealing sleeve 31 in the first pipe joint 121, the sealing connection between them is realized by the elastic deformation of the flexible sealing sleeve 31, and the second pipe joint 21 is supported and limited by the rigid supporting ring 32, so as to avoid the rupture of the first pipe joint 121 due to excessive plug-in force.

[0059] In other words, the flexible sealing sleeve 31 is in interference cooperation with the inner wall of the first pipe joint 121 and the outer wall of the second pipe joint 21 to realize the sealing effect. The interference amount between the flexible sealing sleeve 31 and the inner wall of the first pipe joint 121 and the interference amount between the plug-in hole 311 and the outer wall of the second pipe joint 21 can be controlled to ensure the sealing strength. In addition, the flexible sealing sleeve 31 can also absorb the size tolerance of the second pipe joint 21 and the first pipe joint 121 at different angles in the circumferential direction to ensure the sealing effect. The rigid supporting ring 32 is used to support the flexible sealing sleeve 31 and can also limit the second pipe joint 21, so as to avoid the excessive deformation of the flexible sealing sleeve 31 to extrude the first pipe joint 121. By controlling the hardness of the rigid supporting ring 32, the connection strength and the sealing strength between the first pipe joint 121 and the second pipe joint 21 can be ensured, and the flexible sealing sleeve 31 can be prevented from being pulled off and crushed.

[0060] In the embodiment, the material of the flexible sealing sleeve 31 can be any one of EPDM (Ethylene-propylene-diene Monomer), TPE (Thermoplastic Elastomer) and TPU (Thermoplastic Polyurethanes), as long as it can realize the sealing effect, which is not limited herein. The material of the rigid supporting ring 32 can be any one of aluminum and steel, as long as it can realize the functions of improving the sealing strength and preventing the flexible sealing sleeve 31 from being pulled off and crushed during the expansion joint, which is not limited herein.

[0061] It should be noted that the flexible sealing sleeve 31 and the rigid support ring 32 can be integrally formed by embedding the rigid material through injection molding, or the flexible sealing sleeve 31 and the rigid support ring 32 can be separately processed first, and then the rigid support ring 32 is inserted into the embedding groove 312 of the flexible sealing sleeve 31.

[0062] The plug-in hole 311 is conical, the diameter of the plug-in hole 311 gradually decreases along the insertion direction of the second pipe joint 21, the maximum diameter of the plug-in hole 311 is greater than the diameter of the plug-in part of the second pipe joint 21, and the minimum diameter of the plug-in hole 311 is less than the diameter of the plug-in part of the second pipe joint 21, so that the second pipe joint 21 can be smoothly inserted into the plug-in hole 311, and part of the inner wall of the plug-in hole 311 can be in interference fit with the outer wall of the second pipe joint 21 to improve the sealing performance of the connection part.

[0063] When the second pipe joint 21 is inserted into the plug-in hole 311, the flexible sealing sleeve 31 will be subjected to extrusion force. In order to avoid cracks in the flexible sealing sleeve 31 due to excessive extrusion force, the end face of the flexible sealing sleeve 31 away from the second pipe joint 21 has a deformation buffer groove 313 arranged around the side of the plug-in hole 311, so that the deformation buffer groove 313 can absorb the deformation amount of the flexible sealing sleeve 31 caused by the extrusion force.

[0064] In this embodiment, the longitudinal section of the deformation buffer groove 313 is V-shaped. The V-shaped deformation buffer groove 313 not only facilitates processing, but also has good energy absorption effect.

[0065] The outer peripheral wall of the second pipe joint 21 protrudes a baffle 211 extending in the radial direction thereof, the baffle 211 can be inserted into the first pipe joint 121, and the diameter of the baffle 211 is greater than the maximum diameter of the plug-in hole 311. The baffle 211 not only limits the insertion depth of the second pipe joint 21, but also prevents the filling glue 400 from flowing into the first pipe joint 121, ensuring the smoothness of the internal flow channel of the liquid cooling system 300; and increases the bonding area with the filling glue 400, and improves the fixing effect of the filling glue 400 on the connection part.

[0066] Further, the sealing assembly 3 further comprises a sealing gasket 33, the inner wall of the first pipe joint 121 has a limiting groove 1211 accommodating the sealing gasket 33, part of the sealing gasket 33 is accommodated in the limiting groove 1211, and the sealing gasket 33 is located between the baffle 211 and the flexible sealing sleeve 31. The sealing gasket 33 can prevent the baffle 211 from directly acting on the flexible sealing sleeve 31, and prevent the baffle 211 from generating large extrusion force on the flexible sealing sleeve 31.

[0067] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A liquid cooling system, characterized by, The liquid cooling plate (2) and the connecting pipe (1) are provided with a first pipe joint (121) and a second pipe joint (21) which can be inserted into the first pipe joint (121), and the second pipe joint (21) is provided with a sealing assembly (3) at the matching part of the first pipe joint (121). The flexible sealing sleeve (31) is accommodated in the first pipe joint (121) and has a plug-in hole (311) penetrating through the thickness direction of the flexible sealing sleeve (31), and the outer side wall of the flexible sealing sleeve (31) is in sealing cooperation with the inner wall of the first pipe joint (121), and at least part of the inner wall of the plug-in hole (311) can be in sealing cooperation with the outer wall of the second pipe joint (21). The rigid supporting ring (32) is embedded in the flexible sealing sleeve (31).

2. The liquid cooling system of claim 1, wherein, The flexible sealing sleeve (31) is further provided with an embedding groove (312) arranged around the plug-in hole (311), and the rigid supporting ring (32) is accommodated in the embedding groove (312).

3. The liquid cooling system of claim 1, wherein, The plug-in hole (311) is conical, the diameter of the plug-in hole (311) gradually decreases along the insertion direction of the second pipe joint (21), the maximum diameter of the plug-in hole (311) is greater than the diameter of the plug-in part of the second pipe joint (21), and the minimum diameter of the plug-in hole (311) is less than the diameter of the plug-in part of the second pipe joint (21).

4. The liquid cooling system of claim 3, wherein, The end face of the flexible sealing sleeve (31) away from the second pipe joint (21) is provided with a deformation buffer groove (313) arranged around the plug-in hole (311).

5. The liquid cooling system of claim 1, wherein, The outer peripheral wall of the second pipe joint (21) is provided with a baffle (211) extending along the radial direction thereof, the baffle (211) can be inserted into the first pipe joint (121), and the diameter of the baffle (211) is greater than the maximum diameter of the plug-in hole (311).

6. The liquid cooling system of claim 5, wherein, The sealing assembly (3) further comprises a sealing gasket (33), the inner wall of the first pipe joint (121) is provided with a limiting groove (1211), part of the sealing gasket (33) is accommodated in the limiting groove (1211), and the sealing gasket (33) is located between the baffle (211) and the flexible sealing sleeve (31).

7. The liquid cooling system of any of claims 1-6, wherein, At least two connecting pipes (1) connected in sequence form a total pipe (10), each of the connecting pipes (1) comprises a main pipe (11) and a branch pipe (12) connected at an angle and in communication with the main pipe (11), one of the main pipes (11) of two adjacent connecting pipes (1) is inserted into the other, and the outer peripheral wall of one of the main pipes (11) is provided with an elastic buckle (13), the outer peripheral wall of the other is provided with a clamping convex (14) matched with the elastic buckle (13), and the branch pipe (12) is provided with the first pipe joint (121) or the second pipe joint (21).

8. The liquid cooling system of claim 7, wherein, The elastic buckle (13) has a first limiting surface (131), the clamping convex (14) has a second limiting surface (141) abutting against the first limiting surface (131), and the distance L1 between the first limiting surface (131) and the connecting part of the elastic buckle (13) and the corresponding main pipe (11) is greater than the distance L2 between the second limiting surface (141) and the end of the corresponding main pipe (11).

9. The liquid cooling system of claim 7, wherein, The liquid cooling system has two of the main pipes (10), and one of the main pipes (10) is used for the cooling liquid to flow into the liquid cooling plate (2), and the other main pipe (10) is used for the cooling liquid in the liquid cooling plate (2) to flow out.

10. A battery pack, characterized by, The battery pack comprises a box body (100), a plurality of groups of battery cells, and a liquid cooling system according to any one of claims 1-9, the groups of battery cells are arranged at intervals along a first direction, and the liquid cooling plates (2) are arranged on both sides of each group of battery cells, and the gap between the groups of battery cells, the liquid cooling system, and the box body (100) is filled with filling glue (400).

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