CN220569765U - Liquid cooling system and battery pack - Google Patents

Abstract

The utility model belongs to the technical field of battery packs and discloses a liquid cooling system and a battery pack. The battery module comprises a battery box body, a plurality of fixing structures, a plurality of battery cells, a plurality of battery modules and a plurality of battery modules, wherein the plurality of fixing structures are mutually parallel and are arranged in the battery box body at intervals, a battery cell accommodating space is formed between the adjacent fixing structures, and the battery cell accommodating space can accommodate and position a row of battery cells of the battery module; the serpentine liquid cooling tube is positioned at the fixed structure, and the serpentine liquid cooling tube can contact two opposite sides of the array of the battery cells; alternatively, the serpentine liquid-cooled tube can contact opposite sides of a column of the cells and sides of a column of the cells at the ends of the cells. The liquid cooling system can improve the cooling area, and can provide reliable positioning support for two adjacent battery cells, so that the stability of the battery cells and the battery cell is ensured, and the overall strength of the battery pack is improved.

Description

Liquid cooling system and battery pack

Technical Field

The utility model relates to the technical field of battery packs, in particular to a liquid cooling system and a battery pack.

Background

With the technical development of new energy industry, the requirement on quick charge of the battery pack is higher and higher, and the heat dissipation performance needs to be ensured in the quick charge process of the battery pack. The battery pack can bring very big calorific capacity to charge fast, can lead to the battery to rise temperature excessively when not fully charged, and the high temperature can influence the charging process of battery pack, leads to the problem of insufficient charging, can even take place the explosion accident because of the high temperature.

The mode for cooling the battery cells in the common battery pack is as follows: the liquid cooling plate is designed at the bottom of the battery pack to cool the battery cell, so that a part of space in the height direction of the battery pack is occupied, the arrangement of the battery cell is affected, and the structure compactness of the battery pack is not facilitated to be improved. And the cooling area of the cooling mode of the liquid cooling plate is insufficient, the cooling requirement in the quick charging process of the battery pack cannot be met, and the liquid cooling plate is only arranged at the bottom of the battery core, so that the temperature difference between the upper part and the lower part of the same battery core is overlarge.

In order to solve the above problems, the prior art proposes a cooling mode of a liquid cooling tube, in which the liquid cooling tube is arranged in a box of a battery pack in a serpentine shape, that is, a liquid cooling tube is sandwiched between two adjacent rows of electric cores, so that the cooling area can be increased, and the temperature uniformity of the same electric core can be ensured. However, in the above cooling mode of the liquid cooling tube, the liquid cooling tube cannot be reliably fixed, that is, stability cannot be ensured between the liquid cooling tube and the battery cell, which is not beneficial to improving the strength of the whole battery pack.

Therefore, a liquid cooling system and a battery pack are needed to solve the above problems.

Disclosure of Invention

According to one aspect of the utility model, an objective of the utility model is to provide a liquid cooling system, which can increase the cooling area, and can provide reliable positioning support for two adjacent rows of cells, so as to ensure the stability of the battery pack and the stability of the battery cells, and further increase the overall strength of the battery pack.

To achieve the purpose, the utility model adopts the following technical scheme:

the liquid cooling system is configured to set up in the battery box, cools off the battery module in the battery box, the liquid cooling system includes:

the battery box comprises a plurality of fixing structures, wherein the fixing structures are parallel to each other and are arranged in the battery box body at intervals, and a battery cell accommodating space is formed between the adjacent fixing structures and can accommodate and position a row of battery cells of the battery module;

at least one serpentine liquid-cooled tube positioned in the fixed structure, the serpentine liquid-cooled tube capable of contacting opposite sides of a row of the cells; or alternatively, the first and second heat exchangers may be,

the serpentine liquid-cooled tube is capable of contacting opposite sides of a column of the cells and sides of a column of the cells at the ends of the cells.

As the preferable scheme of the liquid cooling system provided by the utility model, the serpentine liquid cooling pipe comprises a plurality of sections of cooling contact sections and a plurality of sections of end connection sections, wherein adjacent cooling contact sections are communicated through one end connection section, and the cooling contact sections are embedded in the fixing structure and can contact with the side parts of a row of electric cores.

As the preferable scheme of the liquid cooling system provided by the utility model, the fixing structure comprises a first fixing piece and a second fixing piece, a first long hole is formed along the length direction of the first fixing piece, a second long hole is formed along the length direction of the second fixing piece, the first fixing piece and the second fixing piece are mutually abutted and attached, and the cooling contact section is embedded in the first long hole and the second long hole.

As a preferable scheme of the liquid cooling system provided by the utility model, the liquid cooling system further comprises a plurality of side baffle structures, the side baffle structures are respectively arranged at two ends of the electric core accommodating space, the side baffle structures are fixed in the battery box, two of the end parts of one row of electric cores respectively lean against the two side baffle structures, and the side baffle structures can position the end parts of the first fixing piece and the end parts of the second fixing piece.

As a preferred solution of the liquid cooling system provided by the utility model, the side blocking structure includes an abutting portion, a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion are parallel to each other and are arranged at two ends of the abutting portion at intervals, the abutting portion is arranged at intervals from the inner side wall of the battery box, and the first positioning portion and the second positioning portion extend towards the inner side wall of the battery box;

the end connecting section is clamped between the battery cell and the abutting part and is attached to the battery cell; or (b)

The end connecting section penetrates through the first positioning part and the second positioning part and is clamped between the abutting part and the inner side wall of the battery box body.

As the preferable scheme of the liquid cooling system provided by the utility model, the side baffle structure is of an L-shaped structure and comprises a connecting part and a supporting part which are mutually fixedly connected, wherein the connecting part is positioned at the end part of the first fixing piece or the end part of the second fixing piece;

the support part is arranged at intervals with the inner side wall of the battery box body and is fixedly connected to the inner bottom of the battery box body, and the end connecting section is clamped between the support part and the inner side wall of the battery box body.

As the preferred scheme of the liquid cooling system provided by the utility model, the snakelike liquid cooling pipe also comprises a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are respectively arranged and communicated with the end connecting section and extend out of the side wall of the battery box body.

As the preferable scheme of the liquid cooling system provided by the utility model, the serpentine liquid cooling pipe is of a double-layer structure and comprises a water inlet circulating pipe layer and a water outlet circulating pipe layer, wherein the water inlet circulating pipe layer and the water outlet circulating pipe layer are arranged at intervals along the height direction of the battery box body and are mutually communicated, the water inlet pipe is arranged on the water inlet circulating pipe layer, and the water outlet pipe is arranged on the water outlet circulating pipe layer.

As the preferable scheme of the liquid cooling system provided by the utility model, the cooling contact surfaces of the snake-shaped liquid cooling pipe and the battery core are all planes.

According to another aspect of the present utility model, it is an object to provide a battery pack, the battery pack includes the battery case and the battery module, the battery module is disposed in the battery case, including a plurality of the battery cells, the battery pack further includes a liquid cooling system according to any one of the above schemes, and the liquid cooling system is disposed in the battery case.

The utility model has the beneficial effects that:

the liquid cooling system provided by the utility model is configured to be arranged in a battery box body and used for cooling a battery module in the battery box body, and comprises a fixed structure and at least one serpentine liquid cooling pipe. The battery module comprises a battery box body, a plurality of fixing structures, a plurality of battery cells, a plurality of battery modules and a plurality of battery modules, wherein the plurality of fixing structures are mutually parallel and are arranged in the battery box body at intervals, a battery cell accommodating space is formed between every two adjacent fixing structures, and the battery cell accommodating space can accommodate and position a row of battery cells of the battery module. That is, the fixing structure can provide reliable positioning support for two adjacent columns of battery cells and ensure the stability of the battery cells. The serpentine liquid cooling tube is positioned at the fixed structure, and the serpentine liquid cooling tube can contact two opposite sides of the array of the battery cells; alternatively, the serpentine liquid-cooled tube can contact opposite sides of a column of the cells and sides of a column of the cells at the ends of the cells. Through above-mentioned setting, can increase the cooling area, this fixed knot constructs can also provide the support for snakelike liquid cooling pipe, prevents to produce the extrusion problem between snakelike liquid cooling pipe and the electric core to promote battery package bulk strength.

Drawings

Fig. 1 is a schematic view of a battery pack according to a first embodiment of the present utility model;

FIG. 2 is a schematic diagram illustrating an installation of a liquid cooling system in a battery case according to an embodiment of the present utility model;

FIG. 3 is an enlarged view of a portion of the structure labeled A in FIG. 2;

FIG. 4 is an enlarged view of a portion of the structure labeled B in FIG. 2;

FIG. 5 is an exploded view of a stationary structure and serpentine liquid-cooled tube provided in accordance with a first embodiment of the present utility model;

FIG. 6 is an enlarged view of a portion of the structure labeled C in FIG. 5;

FIG. 7 is an enlarged view of a portion of the structure labeled D in FIG. 5;

FIG. 8 is a partial schematic view of another side rail structure according to a first embodiment of the present utility model;

FIG. 9 is a schematic diagram of a connection between a serpentine liquid-cooled tube and a first and second fastener according to an embodiment of the present utility model.

In the figure:

10. a battery case; 20. a battery module; 21. a battery cell;

100. a fixed structure; 110. a first fixing member; 111. a first long hole; 112. a first end bending portion; 120. a second fixing member; 121. a second long hole; 122. a second end bending part;

200. serpentine liquid-cooled tube; 210. cooling the contact section; 220. an end connection section; 230. a water inlet pipe; 240. a water outlet pipe; 250. a water inlet circulation pipe layer; 260. a water outlet circulation pipe layer; 270. a fin; 280. a foam layer;

300. a side stop structure; 310. an abutting portion; 320. a first positioning portion; 330. a connection part; 340. a supporting part.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Example 1

Fig. 1 shows a schematic diagram of a battery pack according to an embodiment of the present utility model, and fig. 2 shows an installation schematic diagram of a liquid cooling system according to an embodiment of the present utility model in a battery box. Referring to fig. 1 and 2, the present embodiment provides a liquid cooling system and a battery pack. The battery pack comprises a battery box body 10 and the battery module 20, wherein the battery module 20 is arranged in the battery box body 10 and comprises a plurality of electric cores 21, the electric cores 21 are arranged in a plurality of rows, and each row is provided with a plurality of electric cores 21. The battery pack further includes a liquid cooling system provided in this embodiment, and the liquid cooling system is disposed in the battery box 10 to cool the battery module 20 in the battery box 10.

In particular, with continued reference to fig. 1 and 2, the liquid cooling system includes a stationary structure 100 and at least one serpentine liquid cooling tube 200. The fixing structures 100 are plural, the fixing structures 100 are parallel to each other and are arranged in the battery box 10 at intervals, and a battery cell accommodating space is formed between adjacent fixing structures 100, and the battery cell accommodating space can accommodate and position a row of battery cells 21 of the battery module 20. The fixing structure 100 can provide reliable positioning support for two adjacent columns of the battery cells 21, and ensures the strength design of the battery pack. The serpentine liquid-cooled tube 200 is positioned in the stationary structure 100, the serpentine liquid-cooled tube 200 being capable of contacting opposite sides of a row of the cells 21.

Specifically, the serpentine liquid-cooled tube 200 includes a plurality of cooling contact sections 210 that are sequentially connected and arranged in parallel, and the cooling contact sections 210 are embedded in the fixing structure 100 and can contact the side portion of the battery cell 21. That is, the cooling contact sections 210 are disposed on opposite sides of the battery cells 21 in a row to increase the cooling area and to improve the temperature uniformity of the battery cells 21. And this fixed knot constructs 100 can also provide support and protection for snakelike liquid cold tube 200, prevents to produce the extrusion problem between snakelike liquid cold tube 200 and the electric core 21, reduces the risk that liquid cooling tube failure fracture leads to leaking.

FIG. 3 shows a close-up view of the structure labeled A in FIG. 2; FIG. 4 shows a close-up view of the structure labeled B in FIG. 2; fig. 5 shows an exploded view of a stationary structure and serpentine liquid-cooled tube provided in accordance with a first embodiment of the present utility model, and fig. 6 shows an enlarged view of a portion of the structure marked C in fig. 5. Referring to fig. 3 to 6, the fixing structure 100 includes a first fixing member 110 and a second fixing member 120. A first long hole 111 is formed along the length direction of the first fixing member 110, and a second long hole 121 is formed along the length direction of the second fixing member 120. The first fixing member 110 and the second fixing member 120 are abutted against each other, and the cooling contact section 210 can be embedded in the first long hole 111 and the second long hole 121 to fix the serpentine liquid-cooled tube 200. Specifically, the serpentine liquid-cooled tube 200 is welded with fins 270, sandwiched between the first fixing member 110 and the second fixing member 120 by the fins 270, and connected to the first fixing member 110 and the second fixing member 120 by gluing; alternatively, the fin 270 is sandwiched between the first fixing member 110 and the second fixing member 120, and an interference fit is achieved by filling foam between the fin 270 and the first fixing member 110 and between the fin 270 and the second fixing member 120 to form a foam layer 280, as shown in fig. 9. The first fixing member 110 and the second fixing member 120 are both steel structural members, which can reduce the possibility of liquid cooling failure cracking of the serpentine liquid-cooled tube 200 and reduce the risk of leakage of the serpentine liquid-cooled tube 200. The first fixing member 110 and the second fixing member 120 are directly welded and connected in the battery box 10, the installation mode is simple, and the stress of the battery core 21 can be transferred to the frame of the battery box 10, so that the whole package strength of the battery package is increased.

Specifically, the serpentine liquid-cooled tube 200 further comprises a plurality of end connection segments 220. Adjacent ones of the cooling contact sections 210 are connected and communicate by one of the end connection sections 220. The end connection section 220 is located at one end of the cell accommodating space.

More specifically, the cooling contact surfaces of the cooling contact section 210 and the battery cell 21 are all plane surfaces. And the thickness of the cooling contact section 210 is equal to the sum of the thicknesses of the first fixing member 110 and the second fixing member 120, after the cooling contact section 210 is embedded in the first long hole 111 and the second long hole 121, two opposite sides of the cooling contact section 210 can respectively form two planes with one side of the first fixing member 110 facing away from the second fixing member 120 and one side of the second fixing member 120 facing away from the first fixing member 110, so as to match the battery cell 21 with a square appearance.

Fig. 7 shows an enlarged view of a portion of the structure marked D in fig. 5, with continued reference to fig. 5 and 7, the serpentine liquid cooling tube 200 further comprises a water inlet tube 230 and a water outlet tube 240, the water inlet tube 230 and the water outlet tube 240 being disposed in communication with the end connection segment 220, respectively, and extending out of the side wall of the battery case 10. The water inlet pipe 230 can be communicated with an external cooling mechanism, and after the cooling liquid is cooled by the external liquid cooling mechanism, the cooling liquid is sent into the serpentine liquid cooling pipe 200 through the water inlet pipe 230 by the pumping mechanism, so that the cooling liquid can be provided for the cooling contact section 210 and the end connection section 220. The outlet pipe 240 is also connected to an outside cooling mechanism to discharge the cooling fluid having an increased temperature in the cooling contact section 210 and the end connection section 220, and is cooled by an external cooling mechanism, and then pumped again to the inlet pipe 230 to form a circulation.

Specifically, the serpentine liquid-cooled tube 200 has a double-layer structure, and includes a water inlet circulation tube layer 250 and a water outlet circulation tube layer 260 which are connected to each other. The water inlet circulation pipe layer 250 and the water outlet circulation pipe layer 260 are spaced apart along the height direction of the battery case 10 and are communicated with each other, the water inlet pipe 230 is disposed at the water inlet circulation pipe layer 250, and the water outlet pipe 240 is disposed at the water outlet circulation pipe layer 260. Through the arrangement, one inlet and one outlet of a single water pipe are realized, and the arrangement quantity of liquid cooling pipes and joints is reduced.

More specifically, the water inlet pipe 230 and the water outlet pipe 240 are disposed on the same end connection section 220 and respectively communicate with the water inlet circulation pipe layer 250 and the water outlet circulation pipe layer 260. With the above arrangement, the coolant can flow through the water inlet pipe 230, the water inlet circulation pipe layer 250, the water outlet circulation pipe layer 260, and the water outlet pipe 240 on the same flow path. The arrangement positions of the water inlet pipe 230 and the water outlet pipe 240 can be simplified, and the installation of the liquid cooling pipe is facilitated.

With continued reference to fig. 2, 3 and 6, the liquid cooling system further includes a plurality of side dam structures 300. The two ends of the battery cell accommodating space are respectively provided with one side blocking structure 300, and the side blocking structure 300 can position the end of the first fixing member 110 and the end of the second fixing member 120 to fix the distance between the adjacent fixing structures 100. The side blocking structures 300 are fixed in the battery box 10, and two of the end portions of the battery cells 21 in a row respectively abut against the two side blocking structures 300 to play a role in resisting expansion of the battery module 20.

Specifically, referring to fig. 3 and 6, the first fixing member 110 includes a first end bent portion 112, and the second fixing member 120 includes a second end bent portion 122. The number of the first end bending parts 112 is two, and the two first end bending parts 112 are respectively positioned at two ends of the first fixing piece 110; similarly, the number of the second end bending portions 122 is two, and the two second end bending portions 122 are respectively located at two ends of the second fixing member 120. The first end bending portion 112 and the second end bending portion 122 of the same fixing structure 100 can be pressed and positioned on the inner side wall of the battery case 10 by the side blocking structure 300.

More specifically, the side shield structure 300 includes an abutment portion 310, a first positioning portion 320, and a second positioning portion. The first positioning portion 320 and the second positioning portion are parallel to each other and spaced apart from each other, and are respectively and vertically fixed to two ends of the abutting portion 310. The abutting portion 310 is spaced from the inner sidewall of the battery case 10, and the first positioning portion 320 and the second positioning portion are respectively provided with a via hole for the terminal connecting section 220 to penetrate. The end connection section 220 is sandwiched between the abutting portion 310 and the inner side wall of the battery case 10, and does not directly contact the battery cells 21, and only the cooling contact section 210 performs a cooling function. The first positioning portion 320 and the second positioning portion extend towards the inner wall of the battery case 10, and the end portion of the first positioning portion 320 of the same side blocking structure 300 can press the second end bending portion 122 of one fixing structure 100 against the inner wall of the battery case 10, as shown in fig. 3; the end of the second positioning portion can press the first end bending portion 112 of the other fixing structure 100 against the inner wall of the battery case 10.

In other embodiments, referring to fig. 8, the side guard structure 300 has an L-shaped structure, and includes a connecting portion 330 and a supporting portion 340 that are fixedly connected to each other. The connection portion 330 is positioned at an end of the first fixing member 110 or an end of the second fixing member 120. That is, the first fixing member 110 and the second fixing member 120 are respectively fixed by one side rail structure 300. The supporting portion 340 is spaced from the inner sidewall of the battery case 10 and is fixedly connected to the inner bottom of the battery case 10, and the end connecting section 220 is sandwiched between the supporting portion 340 and the inner sidewall of the battery case 10 and does not directly contact the battery cell 21.

Example two

The embodiment provides a liquid cooling system and a battery pack. The difference between the present embodiment and the first embodiment is that the serpentine liquid-cooled tube 200 provided in the present embodiment can contact opposite sides of a row of the cells 21 and sides of a row of the cells 21 located at the end of the cells 21, so as to further enhance the cooling effect of the cells 21.

Specifically, the end connection section 220 is sandwiched between the abutment portion 310 of the side rail structure 300 and the side portion of the cell 21 located at the end of one row of the cells 21.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A liquid cooling system configured to be provided in a battery case (10) and cool a battery module (20) in the battery case (10), the liquid cooling system comprising:

the battery box comprises a plurality of fixing structures (100), wherein the fixing structures (100) are parallel to each other and are arranged in the battery box body (10) at intervals, a battery cell accommodating space is formed between every two adjacent fixing structures (100), and a row of battery cells (21) of the battery module (20) can be accommodated and positioned in the battery cell accommodating space;

-at least one serpentine liquid-cooled tube (200), said serpentine liquid-cooled tube (200) being positioned at said fixed structure (100), said serpentine liquid-cooled tube (200) being capable of contacting opposite sides of a row of said cells (21); or alternatively, the first and second heat exchangers may be,

the serpentine liquid-cooled tube (200) is capable of contacting opposite sides of a column of the cells (21) and sides of a column of the cells (21) at the ends of the cells (21).

2. The liquid cooling system according to claim 1, wherein the serpentine liquid cooling tube (200) comprises a plurality of cooling contact sections (210) and a plurality of end connection sections (220), wherein adjacent cooling contact sections (210) are communicated through one end connection section (220), and wherein the cooling contact sections (210) are embedded in the fixing structure (100) and can contact sides of a row of the electric cells (21).

3. The liquid cooling system according to claim 2, wherein the fixing structure (100) includes a first fixing member (110) and a second fixing member (120), a first long hole (111) is formed along a length direction of the first fixing member (110), a second long hole (121) is formed along a length direction of the second fixing member (120), the first fixing member (110) and the second fixing member (120) are abutted against each other, and the cooling contact section (210) is embedded in the first long hole (111) and the second long hole (121).

4. A liquid cooling system according to claim 3, further comprising a plurality of side blocking structures (300), wherein the side blocking structures (300) are respectively arranged at two ends of the cell accommodating space, the side blocking structures (300) are fixed in the cell box body (10), two of the end portions of one row of cells (21) respectively lean against the two side blocking structures (300), and the side blocking structures (300) can position the end portions of the first fixing piece (110) and the end portions of the second fixing piece (120).

5. The liquid cooling system according to claim 4, wherein the side shield structure (300) includes an abutting portion (310), a first positioning portion (320) and a second positioning portion, the first positioning portion (320) and the second positioning portion are parallel to each other and are disposed at two ends of the abutting portion (310) at intervals, the abutting portion (310) is disposed at intervals from an inner side wall of the battery case (10), and the first positioning portion (320) and the second positioning portion each extend toward the inner side wall of the battery case (10);

the end connecting section (220) is clamped between the battery cell (21) and the abutting part (310) and is attached to the battery cell (21); or (b)

The end connecting section (220) penetrates through the first positioning part (320) and the second positioning part and is clamped between the abutting part (310) and the inner side wall of the battery box body (10).

6. The liquid cooling system according to claim 4, wherein the side baffle structure (300) has an L-shaped structure, and comprises a connecting portion (330) and a supporting portion (340) that are fixedly connected to each other, and the connecting portion (330) is positioned at an end of the first fixing member (110) or an end of the second fixing member (120);

the supporting part (340) is arranged at intervals with the inner side wall of the battery box body (10) and is fixedly connected to the inner bottom of the battery box body (10), and the end connecting section (220) is clamped between the supporting part (340) and the inner side wall of the battery box body (10).

7. The liquid cooling system according to claim 2, wherein the serpentine liquid cooling tube (200) further comprises a water inlet tube (230) and a water outlet tube (240), the water inlet tube (230) and the water outlet tube (240) being respectively arranged and connected to the end connection section (220) and extending out of the side wall of the battery box (10).

8. The liquid cooling system according to claim 7, wherein the serpentine liquid cooling tube (200) has a double-layer structure, and comprises a water inlet circulation tube layer (250) and a water outlet circulation tube layer (260), wherein the water inlet circulation tube layer (250) and the water outlet circulation tube layer (260) are arranged at intervals along the height direction of the battery box body (10) and are mutually communicated, the water inlet tube (230) is arranged on the water inlet circulation tube layer (250), and the water outlet tube (240) is arranged on the water outlet circulation tube layer (260).

9. The liquid cooling system according to any one of claims 1-8, wherein the cooling contact surfaces of the serpentine liquid cooling tube (200) and the battery cell (21) are all plane surfaces.

10. The battery pack is characterized by comprising a battery box body (10) and a battery module (20), wherein the battery module (20) is arranged in the battery box body (10) and comprises a plurality of battery cells (21), the battery pack further comprises a liquid cooling system according to any one of claims 1-9, and the liquid cooling system is arranged in the battery box body (10).