Liquid cooling system and battery pack

Abstract

The utility model provides a liquid cooling system and a battery pack. The liquid cooling system comprises a liquid cooling assembly, the liquid cooling assembly comprises a heat conduction part, the heat conduction part comprises a first heat conduction section and a second heat conduction section, the first heat conduction section is provided with a first side face and a second side face which are oppositely arranged, and the top faces of the first side face and the second heat conduction section are in heat conduction contact with the side face and the bottom face of a battery pack of the battery pack respectively; the liquid cooling plate is in heat conduction contact with the second side face of the first heat conduction section and used for conducting heat exchange with the heat conduction piece. The utility model solves the problem that the liquid cooling system of the battery pack in the prior art is easy to fail.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a liquid cooling system and a battery pack. Background Art

[0002] In modern society, new energy batteries are widely used in new energy vehicles. New energy batteries will generate a lot of heat during use. If they are not cooled down in time, the temperature of the new energy batteries will be too high or even the battery will burn. Therefore, it is necessary to set up a liquid cooling system to cool down the new energy batteries. At present, the commonly used method for cooling new energy batteries is to set a liquid cooling plate at the bottom of the battery and use the liquid cooling plate to cool the bottom of the battery. However, this method requires the liquid cooling plate to bear the weight of all batteries while cooling, and the bottom of the battery pack is often a more complicated working condition. If it is hit or scratched, the liquid cooling plate can be easily broken, causing coolant leakage, resulting in the liquid cooling system failing to work normally.

[0003] As can be seen from the above, in the prior art, there is a problem that the liquid cooling system of the battery pack is prone to failure. Utility Model Content

[0004] The main purpose of the utility model is to provide a liquid cooling system and a battery pack to solve the problem that the battery pack liquid cooling system in the prior art is prone to failure.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a liquid cooling system is provided, including a liquid cooling component, the liquid cooling component including: a heat conductive member, the heat conductive member including a first heat conductive segment and a second heat conductive segment, the first heat conductive segment having a first side surface and a second side surface arranged opposite to each other, the first side surface and the top surface of the second heat conductive segment are respectively used for thermal contact with the side surface and the bottom surface of the battery pack of the battery pack; a liquid cooling plate, the liquid cooling plate is in thermal contact with the second side surface of the first heat conductive segment, and is used for heat exchange with the heat conductive member.

[0006] Furthermore, it also includes a heat conductive member group, which includes a plurality of heat conductive members spaced apart along the length direction of the liquid cooling plate, and each second side surface of the heat conductive member group is in thermal contact with the liquid cooling plate.

[0007] Furthermore, a heat conduction assembly is included, the heat conduction assembly includes two heat conduction members, the second side surfaces of the two heat conduction members are arranged opposite to each other, and the second side surfaces of the two heat conduction members are in heat conduction contact with the liquid cooling plate.

[0008] Furthermore, the liquid cooling plate has a flow channel cavity, which extends along the length direction of the liquid cooling plate. There are multiple flow channel cavities, and the multiple flow channel cavities are arranged at intervals along the height direction of the liquid cooling plate.

[0009] Furthermore, the heat conducting element is a heat pipe.

[0010] Furthermore, the liquid cooling assembly also includes a partition, which is arranged between two adjacent battery packs and connected to the liquid cooling plate. The liquid cooling assembly is connected and fixed to the box body of the battery pack through the partition.

[0011] Furthermore, the partition includes a first partition and a second partition, there are multiple liquid cooling components, the first partition is arranged parallel to the liquid cooling plate and is located between two adjacent liquid cooling components, the two ends of the first partition along the length direction are used to connect with the box body, and the second partition is arranged perpendicular to the liquid cooling plate and is used to connect the liquid cooling plate with the first partition and / or the box body.

[0012] Furthermore, there are multiple liquid cooling components, and the liquid cooling plates of the multiple liquid cooling components are connected through connecting pipes.

[0013] According to another aspect of the utility model, a battery pack is provided, including a top cover, a box body, a battery pack and the above-mentioned liquid cooling system, the top cover and the box body form a containing space, and the battery pack and the liquid cooling system are contained in the containing space.

[0014] Furthermore, the box body includes a bottom plate, and the liquid cooling assembly is bonded to the bottom plate.

[0015] According to the technical solution of the utility model, a liquid cooling system includes a liquid cooling component, the liquid cooling component includes a heat conducting member and a liquid cooling plate, the heat conducting member includes a first heat conducting section and a second heat conducting section, the first heat conducting section has a first side surface and a second side surface arranged opposite to each other, the first side surface and the top surface of the second heat conducting section are respectively used for heat conducting contact with the side surface and the bottom surface of the battery pack of the battery pack, the liquid cooling plate is in heat conducting contact with the second side surface of the first heat conducting section, and is used for heat exchange with the heat conducting member, by arranging the heat conducting member into an L-shape including the first heat conducting section and the second heat conducting section, the first side surface of the first heat conducting section and the top surface of the second heat conducting section are in heat conducting contact with the bottom and a side surface of the battery pack at the same time, the heat generated by the battery pack is absorbed by the heat conducting member, the liquid cooling plate arranged on the second side surface of the first heat conducting section is heat exchanged with the heat conducting member, so that the temperature of the battery pack is reduced, while the battery pack is cooled, the liquid cooling plate is arranged on the side surface of the battery pack but not on the bottom of the battery pack, so as to avoid the liquid cooling plate bearing a large weight and being affected by the complex working conditions at the bottom of the battery pack, which causes the liquid cooling plate to fail, thereby ensuring the normal operation of the liquid cooling system, and solving the problem that the liquid cooling system of the battery pack in the prior art is prone to failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing the structure of a liquid cooling assembly in a specific embodiment of the utility model is shown; and

[0018] Figure 2 A schematic diagram of the structure of a liquid cooling plate in a specific embodiment of the utility model is shown;

[0019] Figure 3 A schematic diagram of the assembly structure of a liquid cooling plate and a partition plate in a specific embodiment of the utility model is shown;

[0020] Figure 4 A schematic diagram of liquid cooling of a liquid cooling plate in a specific embodiment of the utility model is shown;

[0021] Figure 5 A schematic diagram of heat conduction at an angle of a heat conducting member in a specific embodiment of the utility model is shown;

[0022] Figure 6 A heat conduction schematic diagram showing another angle of a heat conduction member in a specific embodiment of the utility model is shown;

[0023] Figure 7 A structural schematic diagram showing an angle of a liquid cooling system in a specific embodiment of the utility model;

[0024] Figure 8 A structural schematic diagram showing another angle of a liquid cooling system in a specific embodiment of the utility model;

[0025] Fig. 9 Shows Figure 8 A partial enlarged view of the middle A;

[0026] Fig.10 Shows Figure 8 The cross-section at A in the middle;

[0027] Fig.11 A cross-sectional view of a heat conducting member in a specific embodiment of the utility model is shown;

[0028] Fig.12 An exploded view of a liquid cooling system in a specific embodiment of the utility model is shown;

[0029] Fig.13 An exploded view of a battery pack in a specific embodiment of the present utility model is shown.

[0030] The above drawings include the following reference numerals:

[0031] 10. heat-conducting member; 11. first heat-conducting section; 111. first side surface; 112. second side surface; 12. second heat-conducting section; 13. capillary core; 20. liquid cooling plate; 21. flow channel cavity; 30. bottom plate; 40. adhesive layer; 50. partition; 60. connecting pipe; 70. top cover; 80. box body; 90. battery pack; 100. liquid inlet pipe; 110. liquid outlet pipe. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0035] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] In order to solve the problem that the liquid cooling system of the battery pack in the prior art is easy to fail, the utility model provides a liquid cooling system and a battery pack. Among them, the battery pack described below includes the liquid cooling system described below.

[0037] like Figures 1 to 11 As shown, the liquid cooling system includes a liquid cooling component, and the liquid cooling component includes a heat conducting member 10 and a liquid cooling plate 20. The heat conducting member 10 includes a first heat conducting segment 11 and a second heat conducting segment 12 connected to each other, the first heat conducting segment 11 has a first side surface 111 and a second side surface 112 arranged opposite to each other, and the top surfaces of the first side surface 111 and the second heat conducting segment 12 are respectively used for heat conducting contact with the side surface and the bottom surface of the battery pack 90, and the liquid cooling plate 20 is in heat conducting contact with the second side surface 112 of the first heat conducting segment 11, and is used for heat exchange with the heat conducting member 10.

[0038] By configuring the heat conducting member 10 to include a first heat conducting segment 11 and a second heat conducting segment 12, the first side surface 111 of the first heat conducting segment 11 and the top surface of the second heat conducting segment 12 are in heat-conducting contact with the bottom and one side surface of the battery pack 90 at the same time, the heat generated by the battery pack 90 is absorbed by the heat conducting member 10, and the liquid cooling plate 20 arranged on the second side surface 112 of the first heat conducting segment 11 is heat-exchanged with the heat conducting member 10, so that the temperature of the battery pack 90 is reduced. While cooling the battery pack 90, the liquid cooling plate 20 is arranged on the side of the battery pack instead of at the bottom of the battery pack, so as to avoid the liquid cooling plate 20 bearing a large weight and being affected by the complex working conditions at the bottom of the battery pack, which may cause the liquid cooling plate 20 to fail, thereby ensuring the normal operation of the liquid cooling system.

[0039] In this embodiment, the liquid cooling system also includes a heat conductive member group, which includes a plurality of heat conductive members 10 spaced apart along the length direction of the liquid cooling plate 20 , and the second side 112 of each heat conductive member 10 in the heat conductive member group is in thermal contact with the liquid cooling plate 20 .

[0040] Specifically, the battery pack 90 includes a plurality of battery cells, which are arranged in sequence to form a battery pack. The bottom surface and the side surface of each battery cell are respectively attached to the first side surface 111 of the first heat conducting section 11 and the top surface of the second heat conducting section 12. One battery cell can be set corresponding to one heat conducting member 10, or it can correspond to multiple heat conducting members 10, which can be selected according to the actual size and heat dissipation requirements.

[0041] In this embodiment, the liquid cooling system further includes a heat conducting assembly, which includes two heat conducting members 10, the second side surfaces 112 of the two heat conducting members 10 are arranged opposite to each other, and the second side surfaces 112 of the two heat conducting members 10 are in thermal contact with the liquid cooling plate 20. In other words, the two heat conducting members 10 in the heat conducting assembly are respectively located on both sides of a liquid cooling plate 20. It is understandable that the heat conducting member group includes a plurality of heat conducting members, and the plurality of heat conducting members are arranged at intervals along the length direction of the liquid cooling plate 20. It should be noted that the length direction of the liquid cooling plate 20 is the same as the arrangement direction of the battery cells.

[0042] Specifically, the heat conducting components are symmetrically distributed relative to the liquid cooling plate 20, that is, the liquid cooling plate 20 is located between two adjacent battery packs 90, or between two adjacent rows of battery packs 90, and a row of battery packs 90 includes multiple battery packs 90 along the length direction of the liquid cooling plate 20. This arrangement makes reasonable use of the spatial position on the liquid cooling plate 20, and at the same time, the same position of the liquid cooling plate 20 can cool two heat conducting components 10, that is, both sides of the liquid cooling plate 20 can cool the battery pack 90, thereby improving the heat dissipation efficiency of the liquid cooling system.

[0043] like Fig.10As shown, the liquid cooling plate 20 has a flow channel cavity 21 , which extends along the length direction of the liquid cooling plate 20 . There are multiple flow channel cavities 21 , which are arranged at intervals along the height direction of the liquid cooling plate 20 .

[0044] Specifically, in this embodiment, the liquid cooling plate 20 is a harmonica tube type liquid cooling plate, and the flow channel cavity 21 contains cooling liquid, and the cooling liquid flows from one end of the liquid cooling plate 20 to the other end of the liquid cooling plate 20, so that the liquid cooling plate 20 can achieve uninterrupted cooling in the length direction, and at the same time, the flow channel cavity 21 arranged at intervals in height enables the cooling of the heat conducting member 10 on the side of the entire liquid cooling plate 20. Furthermore, multiple flow channel cavities 21 are arranged at intervals, and the inner wall between two adjacent flow channel cavities 21 acts as a reinforcing rib, so that the liquid cooling plate 20 is structurally strengthened to a certain extent, and the liquid cooling plate 20 is prevented from being greatly deformed when in use.

[0045] In this embodiment, the heat conducting element 10 is a heat pipe.

[0046] Specifically, Fig.11 As shown, the heat conducting member 10 is a hollow structure, and a capillary wick 13 is also accommodated in the heat conducting member 10. The capillary wick 13 is attached along the inner wall of the heat conducting member 10, and the capillary wick 13 is a structure sealed at both ends. The tube wall of the capillary wick 13 contains a phase change liquid. In actual use, the first side surface 111 of the first heat conducting section 11 and the top surface of the second heat conducting section 12 close to the battery pack 90 are heated, and the tube wall of the capillary wick 13 attached to the inside of the heat conducting member 10 and close to one side of the battery pack 90 is heated. The phase change liquid in the tube wall of the capillary wick 13 is heated and evaporates into a gaseous state, flows out of the tube wall of the capillary wick 13, and moves along the pipeline of the capillary wick 13. The phase change liquid evaporated from the second heat conducting section 12 near the battery pack 90 and the phase change liquid evaporated from the first heat conducting section 11 near the battery pack 90 converge at the first heat conducting section 11, and are cooled by the liquid cooling plate 20 at the wall of the capillary wick 13 near the second side surface 112, and become liquid and are absorbed by the wall of the capillary wick 13 here. At this time, the water content of the wall of the capillary wick 13 far away from the battery pack 90 is higher, and the water content of the wall of the capillary wick 13 close to the battery pack 90 is lower. The wall of the capillary wick 13 on this side absorbs the phase change liquid in the wall of the capillary wick 13 on the side away from the battery pack 90 through the capillary effect, thereby realizing a cycle.

[0047] like Figure 3 , Fig.12 as well as Fig.13As shown, the liquid cooling assembly also includes a partition 50, which is disposed between two adjacent battery packs 90 and connected to the liquid cooling plate 20, and the liquid cooling assembly is connected and fixed to the box 80 of the battery pack through the partition 50. Specifically, the partition 50 includes a first partition and a second partition, and there are multiple liquid cooling assemblies. The first partition is disposed parallel to the liquid cooling plate 20 and is located between two adjacent liquid cooling assemblies. Both ends of the first partition along the length direction are used to connect to the box 80, and the second partition is disposed perpendicular to the liquid cooling plate 20, and is used to connect the liquid cooling plate 20 with the first partition and / or the box 80.

[0048] In order to match the multiple rows of battery groups 90 in the battery pack, there are multiple liquid cooling assemblies, and the liquid cooling plates 20 of the multiple liquid cooling assemblies are connected through connecting pipes 60.

[0049] Specifically, in this embodiment, there are two liquid cooling components, such as Figures 1 to 4 , Figures 7 to 9 as well as Figure 12 to Figure 13 As shown, a liquid inlet pipe 100 and a liquid outlet pipe 110 are respectively provided on the two liquid cooling plates 20, so that the coolant in the two liquid cooling plates 20 flows from one end of one liquid cooling plate 20 through the connecting pipe 60 and flows out from one end of the other liquid cooling plate 20. The liquid inlet pipe 100 and the liquid outlet pipe 110 are both located at one end of the liquid cooling plate 20 away from the connecting pipe 60, which is convenient for the installation of the liquid cooling plate 20.

[0050] like Fig.13 As shown, the utility model also provides a battery pack, which includes a top cover 70, a box body 80, a battery pack 90 and the above-mentioned liquid cooling system. The top cover 70 and the box body 80 form a containing space, and the battery pack 90 and the liquid cooling system are contained in the containing space.

[0051] like Figures 7 to 10 , Figure 12 to Figure 13 As shown, the liquid cooling system further includes a base plate 30 , and the liquid cooling components are disposed on the base plate 30 .

[0052] Specifically, in addition to being connected to the inner wall of the box body 80 through the partition 50, the liquid cooling system is also connected to the bottom of the box body 80 through the bottom plate 30, so that the liquid cooling system is fixed in the battery pack.

[0053] Specifically, the bottom plate 30 may be an aluminum plate or a steel plate with high structural strength, so that the bottom plate 30 can bear the weight of the battery pack 90 and cope with complex working conditions such as bottom impact and scraping of the battery pack, thereby improving the structural strength and service life of the battery pack.

[0054] like Figure 12 to Figure 13 As shown, the liquid cooling system further includes a glue layer 40 , which is located between the liquid cooling assembly and the bottom plate 30 , and the bottom surface of the second heat conducting section 12 and the bottom plate 30 are respectively glued to the glue layer 40 .

[0055] Specifically, in this embodiment, the area of ​​the adhesive layer 40 is the same as the area of ​​the bottom plate 30 , so that the plurality of heat-conducting members 10 are all fixed on the bottom plate 30 , thereby preventing the heat-conducting members 10 from shifting.

[0056] In an optional embodiment, the adhesive layer 40 is equal to the bottom area of ​​the second heat-conducting section 12 of the heat-conducting component 10, and the bottom surface of any heat-conducting component 10 is provided with an adhesive layer 40. In this case, the adhesive layer 40 is a rubber strip. This method achieves precise bonding, reduces material waste, and facilitates the replacement of failed or damaged heat-conducting components 10.

[0057] In this embodiment, the liquid cooling plates 20 of the two liquid cooling assemblies are parallel and spaced apart. The battery pack includes two groups of battery packs 90, corresponding to the two liquid cooling assemblies. One group of battery packs 90 includes two rows of battery packs 90, which are respectively located on both sides of the liquid cooling plate 20 and extend along the length direction of the liquid cooling plate 20. Four rows of battery packs 90 are arranged side by side, and one row of battery packs 90 includes three spaced apart battery packs 90. There are three partitions 50, including a first partition and two second partitions, wherein the first partition is parallel to the liquid cooling plate 20 and is located between the two groups of battery packs 90, the two second partitions are perpendicular to the liquid cooling plate 20 and spaced apart, and the second partition is a three-section structure, which is respectively located on both sides of the two liquid cooling plates 20 and between the two liquid cooling plates 20 and are both connected to the liquid cooling plate 20 and the first partition, and the two second partitions are located between two adjacent battery packs 90 in each row of battery packs 90. It is understandable that the partition 50 and the liquid cooling plate 20 form a well structure, a battery pack 90 is accommodated in one well, and both ends of the partition 50 are connected to the inner walls of the battery pack box 80, so that the liquid cooling system is fixed in the accommodation space in the horizontal direction. Of course, the number of the first partition and the second partition in the present application is not limited, and it can correspond to the number of liquid cooling components and battery packs 90.

[0058] In an optional embodiment, the first partition plate and the second partition plate are an integrated structure, and a clearance gap for avoiding the liquid cooling plate 20 is opened on the second partition plate, and the liquid cooling plate 20 and the second partition plate are clamped.

[0059] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by setting a liquid cooling system including a liquid cooling component, the liquid cooling component includes a heat conductive member 10 and a liquid cooling plate 20, the heat conductive member 10 includes a first heat conductive segment 11 and a second heat conductive segment 12, the first heat conductive segment 11 has a first side surface 111 and a second side surface 112 arranged opposite to each other, the first side surface 111 and the top surface of the second heat conductive segment 12 are respectively used for heat conductive contact with the side surface and the bottom surface of the battery pack 90, the liquid cooling plate 20 is in heat conductive contact with the second side surface 112 of the first heat conductive segment 11, and is used for heat exchange with the heat conductive member 10, by setting the heat conductive member 10 to include the first heat conductive segment 11 and the second heat conductive segment 12. The second heat conducting section 12 is L-shaped, the first side surface 111 of the first heat conducting section 11 and the top surface of the second heat conducting section 12 are in heat-conducting contact with the bottom and one side of the battery pack 90 at the same time, the heat generated by the battery pack 90 is absorbed by the heat conducting member 10, and the temperature of the battery pack 90 is reduced by heat exchange between the liquid cooling plate 20 arranged on the second side surface 112 of the first heat conducting section 11 and the heat conducting member 10. When the battery pack 90 is cooled, the liquid cooling plate 20 is arranged on the side of the battery pack instead of at the bottom of the battery pack, so as to avoid the liquid cooling plate 20 bearing a large weight and being affected by the complex working conditions at the bottom of the battery pack, thereby preventing the liquid cooling plate 20 from failing due to the heavy weight and the influence of the complex working conditions at the bottom of the battery pack, thereby ensuring the normal operation of the liquid cooling system.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0062] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A liquid cooling system, characterized in that: A liquid cooling assembly is included, wherein the liquid cooling assembly includes: A heat conducting member (10), the heat conducting member (10) comprising a first heat conducting section (11) and a second heat conducting section (12) connected to each other, the first heat conducting section (11) having a first side surface (111) and a second side surface (112) arranged opposite to each other, the first side surface (111) and the top surface of the second heat conducting section (12) being respectively used for thermally contacting the side surface and the bottom surface of a battery pack (90) of the battery pack; A liquid cooling plate (20), the liquid cooling plate (20) being in thermal contact with the second side surface (112) of the first heat conducting section (11), and being used for performing heat exchange with the heat conducting element (10).

2. The liquid cooling system according to claim 1, characterized in that: It also includes a heat-conducting member group, which includes a plurality of the heat-conducting members (10) arranged at intervals along the length direction of the liquid cooling plate (20), and each of the second side surfaces (112) in the heat-conducting member group is in thermal contact with the liquid cooling plate (20).

3. The liquid cooling system according to claim 1, characterized in that: It also includes a heat-conducting component, which includes two heat-conducting parts (10), the second side surfaces (112) of the two heat-conducting parts (10) are arranged opposite to each other, and the second side surfaces (112) of the two heat-conducting parts (10) are both in heat-conducting contact with the liquid cooling plate (20).

4. The liquid cooling system according to claim 1, characterized in that: The liquid cooling plate (20) has a flow channel cavity (21), the flow channel cavity (21) extends along the length direction of the liquid cooling plate (20), there are a plurality of flow channel cavities (21), and the plurality of flow channel cavities (21) are arranged at intervals along the height direction of the liquid cooling plate (20).

5. The liquid cooling system according to claim 1, characterized in that: The heat conducting member (10) is a heat pipe.

6. The liquid cooling system according to claim 1, characterized in that: The liquid cooling assembly further comprises a partition (50), wherein the partition (50) is arranged between two adjacent battery packs (90) and connected to the liquid cooling plate (20), and the liquid cooling assembly is connected and fixed to the box body (80) of the battery pack via the partition (50).

7. The liquid cooling system according to claim 6, characterized in that: The partition (50) includes a first partition and a second partition, and there are multiple liquid cooling components. The first partition is arranged in parallel with the liquid cooling plate (20) and is located between two adjacent liquid cooling components. The two ends of the first partition along the length direction are used to connect with the box (80), and the second partition is arranged perpendicular to the liquid cooling plate (20) and is used to connect the liquid cooling plate (20) with the first partition and / or the box (80).

8. The liquid cooling system according to any one of claims 1 to 6, characterized in that: There are multiple liquid cooling components, and the liquid cooling plates (20) of the multiple liquid cooling components are connected via a connecting pipe (60).

9. A battery pack, characterized in that: The invention comprises a top cover (70), a box body (80), a battery pack (90) and a liquid cooling system according to any one of claims 1 to 8, wherein the top cover (70) and the box body (80) form a containing space, and the battery pack (90) and the liquid cooling system are contained in the containing space.

10. The battery pack according to claim 9, characterized in that: The box body (80) comprises a bottom plate (30), and the liquid cooling assembly is bonded to the bottom plate (30).

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