Liquid cooling plate, battery cooling system and battery pack

Abstract

The liquid cooling plate comprises a first harmonica-shaped tube, a second harmonica-shaped tube and reinforcing ribs, the first harmonica-shaped tube and the second harmonica-shaped tube are arranged at intervals along the vertical direction of the liquid cooling plate, a direct flow channel is arranged in the first harmonica-shaped tube, a bent channel is arranged in the second harmonica-shaped tube, the direct flow channel is communicated with the bent channel, and the reinforcing ribs are arranged on the first harmonica-shaped tube and the second harmonica-shaped tube. A heat exchange medium flows in the channel; the reinforcing rib is fixed between the first harmonica-shaped tube and the second harmonica-shaped tube and is used for preventing the harmonica-shaped tubes from being extruded and deformed; through the arrangement of reinforcing ribs, direct current channels and bending channels, when the channels of the parallelograms are extruded by the expansion force of the battery cell, the channels deform, and when the deformation area reaches the reinforcing ribs, as the reinforcing ribs are solid, when the battery cell expands to the position, the first harmonica-shaped tube and the second harmonica-shaped tube cannot be further crushed, and the battery cell can be prevented from being damaged by the first harmonica-shaped tube and the second harmonica-shaped tube. And therefore, crushing of the liquid cooling plate caused by cell expansion at the end of the cell life is prevented, and the stability of the cooling structure is improved.

Description

Technical Field

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

[0002] With the development and commercialization of electric vehicles, people are increasingly eager for fast charging of new energy electric vehicles. Fast charging technology plays an irreplaceable role in the user experience of electric vehicles. In the process of fast charging of battery packs, large currents and ultra-large currents will cause the heat generated by the battery to increase sharply, causing the temperature of the battery pack to rise sharply. In severe cases, thermal runaway may occur, resulting in risks such as battery combustion and explosion. On the other hand, excessive battery temperature will affect the battery life and the range of electric vehicles, causing people's experience of electric vehicles to deteriorate. How to achieve fast charging, control the battery temperature is particularly important.

[0003] A liquid cooling plate assembly, a battery assembly and a vehicle with publication number CN219226418U, the liquid cooling plate assembly comprising: a harmonica tube, comprising a plurality of cooling channels extending along the length direction of the harmonica tube, the two side walls of the harmonica tube in the thickness direction forming a first heat dissipation portion, the harmonica tube being arranged between two battery cells for dissipating the heat of the two battery cell side walls; and a cooling plate, being arranged on at least one side in the width direction of the harmonica tube, forming a second heat dissipation portion for dissipating the heat of a battery connecting piece connecting the two battery cells; the liquid cooling plate assembly utilizes the first heat dissipation portion to cool the large surfaces of the two side walls of the battery cell, and can also utilize the second heat dissipation portion to absorb the heat generated when current passes through the battery connecting piece, thereby cooling the battery connecting piece.

[0004] Existing battery cells will expand at the end of their life, but no relevant protective structure is provided in the harmonica tube in the above scheme, resulting in the expansion of the battery cells squeezing the cooling channel in the harmonica tube, which will cause deformation and cause the harmonica tube to be crushed, reducing the service life of the cooling structure. Utility Model Content

[0005] In view of this, the utility model proposes a liquid cooling plate, a battery cooling system and a battery pack, which are provided with a collapse-stopping structure to prevent the cold plate from collapsing due to expansion of the battery cell at the end of its life, thereby improving the stability of the cooling structure.

[0006] The technical solution of the utility model is implemented as follows: In a first aspect, the utility model provides a liquid cooling plate, the liquid cooling plate comprises a first harmonica tube, a second harmonica tube and a reinforcing rib, wherein:

[0007] The first harmonica tube and the second harmonica tube are arranged at intervals along the vertical direction of the liquid cooling plate, and a direct current channel is provided in the first harmonica tube, and a bending channel is provided in the second harmonica tube, the direct current channel is connected to the bending channel, and a heat exchange medium flows in the channels;

[0008] The reinforcing rib is fixed between the first harmonica pipe and the second harmonica pipe, and the reinforcing rib is used to prevent the harmonica pipe from being squeezed and deformed.

[0009] On the basis of the above technical solution, preferably, the length of the reinforcing rib is equal to that of the first harmonica tube and the second harmonica tube.

[0010] On the basis of the above technical solution, preferably, a plurality of first partitions are arranged in the first harmonica tube, the first partitions are arranged at an angle, and the plurality of first partitions are arranged at intervals along the height direction of the liquid cooling plate, so as to divide the inner cavity of the first harmonica tube into a plurality of outlet group flow channels which are not connected to each other, and the outlet group flow channels serve as direct current channels of the first harmonica tube.

[0011] On the basis of the above technical solution, preferably, a plurality of second partitions, a plurality of third partitions, a plurality of fourth partitions and two side blocking members are arranged in the second harmonica tube, wherein:

[0012] Both sides of the second harmonica pipe are provided with openings, the second partition plate and the fourth partition plate have the same length, are shorter than the length of the second harmonica pipe, and are longer than the length of the third partition plate;

[0013] The second partition is arranged on a side close to the reinforcing rib, the third partition is arranged on a side of the second partition away from the reinforcing rib, and the fourth partition is arranged on a side of the third partition away from the second partition;

[0014] One side of the second partition is flush with one side opening of the second harmonica pipe, and one side of the fourth partition is flush with the other side opening of the second harmonica pipe;

[0015] One side of the blocking piece is fixed between the inner wall of one opening of the second harmonica tube and the second partition away from the reinforcing rib, and the other side of the blocking piece is fixed between the inner wall of the other opening of the second harmonica tube and the fourth partition close to the third partition, dividing the inner cavity of the second harmonica tube into an S-shaped flow channel, which serves as a bending channel of the second harmonica tube.

[0016] On the basis of the above technical solution, preferably, the sizes of the two side blocking members match the opening size of the second harmonica tube, and the two blocking members are symmetrically arranged with respect to the center point of the second harmonica tube.

[0017] On the basis of the above technical solution, preferably, it further comprises a first current collector and a second current collector, wherein:

[0018] The first current collector is arranged on one side of the first harmonica tube, the second harmonica tube and the reinforcing rib, and the first current collector is provided with a first cavity and a second cavity, the first cavity and the second cavity are not connected to each other, the first cavity is connected to one end of the outlet group flow channel, and the second cavity is connected to one end of the S-shaped flow channel;

[0019] The second current collector is arranged on the other side of the first harmonica tube, the second harmonica tube and the reinforcing rib, and a third cavity is arranged in the second current collector. The other end of the outlet group flow channel and the other end of the S-shaped flow channel are both connected to the third cavity.

[0020] On the basis of the above technical solution, preferably, a liquid inlet end and a liquid outlet end are provided on the first current collector, and the liquid inlet end and the liquid outlet end are both arranged through one side of the first current collector, and the liquid inlet end is connected with the second cavity, and the liquid outlet end is connected with the first cavity, and connecting pipe heads are provided on both sides of the liquid inlet end and the liquid outlet end.

[0021] In a second aspect, the utility model further provides a battery cooling system, comprising a plurality of liquid cooling plates as described above, and also comprising a total water inlet pipeline, a total water outlet pipeline and a plurality of compression pipes, wherein:

[0022] A plurality of liquid cooling plates are arranged in parallel and at intervals, and the battery cells are abutted between two adjacent liquid cooling plates;

[0023] A plurality of compression pipes are respectively arranged between the connecting pipe heads of two adjacent liquid cooling plates, and the compression pipes are communicated with the connecting pipe heads;

[0024] One end of the main water inlet pipeline is connected to the connecting pipe head at the liquid inlet end of the farthest liquid cooling plate, so as to provide heat exchange medium into the liquid cooling plate;

[0025] One end of the total water outlet pipeline is connected to the connecting pipe head at the liquid outlet end of the farthest liquid cooling plate, and is used for the circulation of heat exchange medium in the liquid cooling plate.

[0026] On the basis of the above technical solution, preferably, the main water inlet pipeline and the main water outlet pipeline are located on the same side and are arranged adjacent to each other.

[0027] In a third aspect, the utility model further provides a battery pack, which includes the battery cooling system as described above.

[0028] The liquid cooling plate, battery cooling system and battery pack of the utility model have the following beneficial effects compared with the prior art:

[0029] (1) Through the provision of reinforcing ribs, the DC channel and the bending channel are both parallelogram-shaped. When the parallelogram-shaped channel is squeezed by the expansion force of the battery cell, the flow channel will deform. When the deformation area reaches the reinforcing ribs, since the reinforcing ribs are solid, when the battery cell expands to this point, the first harmonica tube and the second harmonica tube will not be further crushed, thereby preventing the liquid cooling plate from being crushed due to the expansion of the battery cell at the end of its life, thereby improving the stability of the cooling structure;

[0030] (2) By providing a plurality of second baffles, third baffles and fourth baffles, as well as two side blocking members, the inner cavity of the second harmonica tube is cleverly divided into an S-shaped flow channel; this not only increases the flow path length of the fluid in the tube, but also causes the fluid to change direction multiple times during the flow process, thereby enhancing the heat exchange effect between the fluid and the tube wall;

[0031] (3) By adopting adjacent cold and hot flow channels, the liquid inlet flow channel of the second current collector is the coldest area of ​​the flow channel in the cold plate, and the outlet group flow channel of the first current collector is the hottest area. The coldest area and the hottest area are arranged adjacent to each other, and thus will affect each other. The comprehensive temperature prevents the battery cell from being overcooled or overheated, and the temperature difference performance is better, thereby improving the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a three-dimensional diagram of the liquid cooling plate of the utility model;

[0034] Figure 2 It is a front view of the liquid cooling plate of the utility model;

[0035] Figure 3 It is a side view of the liquid cooling plate of the utility model;

[0036] Figure 4 The liquid cooling plate of the utility model Figure 3 Sectional view at AA in the middle;

[0037] Figure 5 A three-dimensional diagram of a battery cooling system of the present utility model;

[0038] Figure 6 It is a three-dimensional diagram of the compression pipe structure of the battery cooling system of the present utility model. DETAILED DESCRIPTION

[0039] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figure 1-6 As shown, the utility model provides a liquid cooling plate, which includes a first harmonica tube 1, a second harmonica tube 2 and a reinforcing rib 3, wherein the first harmonica tube 1 and the second harmonica tube 2 are spaced apart along the vertical direction of the liquid cooling plate, and a direct current channel is provided in the first harmonica tube 1, and a bending channel is provided in the second harmonica tube 2, the direct current channel is connected with the bending channel, and a heat exchange medium flows in the channel; the reinforcing rib 3 is fixed between the first harmonica tube 1 and the second harmonica tube 2, and the reinforcing rib 3 is used to prevent the harmonica tube from being squeezed and deformed.

[0041] It should be noted that a first harmonica tube 1 and a second harmonica tube 2 are provided in the liquid cooling plate, and the direct current channel opened in the first harmonica tube 1 is connected with the bending channel opened in the second harmonica tube 2, and the liquid exchange medium enters from the bending channel and flows out of the direct current channel, and the surface of the battery cell abuts against the surface of the liquid cooling plate, thereby taking away the heat of the battery cell, thereby achieving the effect of heat dissipation, and a reinforcing rib 3 is provided between the first harmonica tube 1 and the second harmonica tube 2, and the direct current channel and the bending channel are both parallelograms. When the parallelogram channel is squeezed by the expansion force of the battery cell, the flow channel will be deformed, and when the deformation area reaches the reinforcing rib 3, since the reinforcing rib 3 is solid, when the battery cell expands to this point, the first harmonica tube 1 and the second harmonica tube 2 will not be further crushed, thereby preventing the liquid cooling plate from being crushed due to the expansion of the battery cell at the end of its life, thereby improving the stability of the cooling structure.

[0042] Specifically, the material of the reinforcing rib 3 in this embodiment is preferably aluminum, and the solid structure of the reinforcing rib 3 is the same as the material of the liquid cooling plate, and the reinforcing rib 3 and the first harmonica tube 1 and the second harmonica tube 2 are an integrally processed structure.

[0043] In this embodiment, the reinforcing rib 3 is equal in length to the first harmonica tube 1 and the second harmonica tube 2 .

[0044] It should be noted that the reinforcing rib 3 is equal to the length of the first harmonica tube 1 and the second harmonica tube 2, which can further enhance the overall performance and stability of the liquid cooling plate. The reinforcing rib 3 can completely cover the length range of the first harmonica tube 1 and the second harmonica tube 2. No matter where the liquid cooling plate is squeezed by the external force of the battery cell expansion, the reinforcing rib 3 can provide effective support and protection to ensure that the harmonica tube will not be deformed or damaged; and it also helps to improve the heat conduction efficiency of the liquid cooling plate. Since the reinforcing rib 3 is in close contact with the first harmonica tube 1 and the second harmonica tube 2, the thermal resistance between them is small, and the heat can be transferred to the entire liquid cooling plate more quickly through the reinforcing rib 3, which helps to achieve a more uniform temperature distribution and improve the heat dissipation effect.

[0045] As a preferred embodiment, a plurality of first partitions 11 are arranged in the first harmonica tube 1 in this embodiment. The first partitions 11 are arranged at an angle, and the plurality of first partitions 11 are arranged at intervals along the height direction of the liquid cooling plate, so as to divide the inner cavity of the first harmonica tube 1 into a plurality of outlet group flow channels 100 which are not connected to each other, and the outlet group flow channels 100 serve as direct current channels of the first harmonica tube 1.

[0046] It should be noted that a plurality of first partitions 11 are arranged at an inclined interval with the first harmonica tube 1, so that the cross-sectional shape of the outlet group flow channel 100 is a parallelogram. The inclined first partitions 11 are also beneficial to reducing the resistance to fluid flow. Compared with vertical or horizontal partitions, the inclined partitions can better guide the flow direction of the fluid and reduce eddy currents and turbulence in the flow of the fluid, which is beneficial to reducing the flow resistance of the fluid and improving the efficiency of the entire liquid cooling system.

[0047] As a preferred embodiment, in the second harmonica tube 2 of the present embodiment, a plurality of second partitions 21, a plurality of third partitions 22, a plurality of fourth partitions 23 and two side blocking members 24 are arranged, wherein openings are arranged on both sides of the second harmonica tube 2, the lengths of the second partition 21 and the fourth partition 23 are equal, and are smaller than the length of the second harmonica tube 2, and are larger than the length of the third partition 22; the second partition 21 is arranged on a side close to the reinforcing rib 3, the third partition 22 is arranged on a side of the second partition 21 away from the reinforcing rib 3, and the fourth partition 23 is arranged on a side of the third partition 22 away from the second partition 2 1; one side of the second partition 21 is flush with one side opening of the second harmonica tube 2, and one side of the fourth partition 23 is flush with the other side opening of the second harmonica tube 2; one side blocking piece 24 is fixed between the inner wall of one side opening of the second harmonica tube 2 and the second partition 21 away from the side of the reinforcing rib 3, and the other side blocking piece 24 is fixed between the inner wall of the other side opening of the second harmonica tube 2 and the fourth partition 23 close to the third partition 22, dividing the inner cavity of the second harmonica tube 2 into an S-shaped flow channel 200, and the S-shaped flow channel 200 serves as a bending channel of the second harmonica tube 2.

[0048] It should be noted that, by providing a plurality of second partitions 21, a third partition 22 and a fourth partition 23, as well as two side blocking members 24, the inner cavity of the second harmonica tube 2 is cleverly divided into an S-shaped flow channel 200; not only the flow path length of the fluid in the tube is increased, but also the fluid changes direction multiple times during the flow process, thereby enhancing the heat exchange effect between the fluid and the tube wall.

[0049] The sizes of the two side blocking members 24 match the opening size of the second harmonica pipe 2 , and the two blocking members 23 are symmetrically arranged 180° rotated around the center point of the second harmonica pipe 2 .

[0050] It should be noted that the size of the side blocking member 24 matches the opening size of the second harmonica pipe 2, ensuring that the side blocking member 24 can be tightly installed at the opening, effectively closing the flow channel and preventing leakage of the fluid in the flow channel.

[0051] The present embodiment also includes a first current collector 4 and a second current collector 5, wherein the first current collector 4 is arranged on one side of the first harmonica tube 1, the second harmonica tube 2 and the reinforcing rib 3, and a first cavity 410 and a second cavity 420 are provided in the first current collector 4, the first cavity 410 and the second cavity 420 are not connected to each other, the first cavity 410 is connected to one end of the outlet group flow channel 100, and the second cavity 420 is connected to one end of the S-shaped flow channel 200; the second current collector 5 is arranged on the other side of the first harmonica tube 1, the second harmonica tube 2 and the reinforcing rib 3, and a third cavity 500 is provided in the second current collector 5, and the other end of the outlet group flow channel 100 and the other end of the S-shaped flow channel 200 are both connected to the third cavity 500.

[0052] It should be noted that the internal flow channel of the second current collector 5 adopts an S-shaped flow channel 200 design, the middle part of the liquid cooling plate is a water inlet channel, and the heat exchange medium passes through the S-shaped flow channel 200, the second current collector 5, the first harmonica tube 1 and the first current collector 4 in sequence. During this process, the heat exchange medium will continuously absorb the heat generated by the battery cell during fast charging, thereby achieving the purpose of cooling the battery cell. Due to the influence of heat absorption, the temperature of the coolant will continue to rise from the inlet to the outlet. This embodiment adopts adjacent cold and hot flow channels. The liquid inlet flow channel of the second current collector 5 is the coldest area of ​​the flow channel in the cold plate, and the outlet group flow channel 100 of the first current collector 4 is the hottest area. The coldest area and the hottest area are adjacent to each other, and will affect each other. The comprehensive temperature prevents the battery cell from being overcooled or overheated, and the temperature difference performance is better, thereby improving the heat exchange effect.

[0053] In this embodiment, a liquid inlet end 430 and a liquid outlet end 440 are provided on the first current collector 4. The liquid inlet end 430 and the liquid outlet end 440 are both arranged through one side of the first current collector 4, and the liquid inlet end 430 is connected to the second cavity 420, and the liquid outlet end 440 is connected to the first cavity 410. Connecting pipe heads 6 are provided on both sides of the liquid inlet end 430 and the liquid outlet end 440.

[0054] It should be noted that the connection pipe head 6 is provided to facilitate the subsequent installation of multiple liquid cooling plates, thereby improving installation efficiency. In addition, the liquid inlet end 430 and the liquid outlet end 440 of the liquid cooling plate at the end do not penetrate the first current collector 4. The flow distribution of each liquid cooling plate in the entire liquid cooling system is adjusted by adjusting the aperture size of the liquid inlet end 430 and the liquid outlet end 440, so that the internal coolant flow distribution of each parallel liquid cooling plate performs better, thereby improving the temperature difference of the entire battery pack.

[0055] In the second aspect, the utility model also provides a battery cooling system, comprising a plurality of liquid cooling plates as described above, and also comprising a total water inlet pipe 7, a total water outlet pipe 8 and a plurality of crimping pipes 9, wherein the plurality of liquid cooling plates are arranged at intervals and in parallel, and the battery cells are abutted between two adjacent liquid cooling plates; the plurality of crimping pipes 9 are respectively arranged between the connecting pipe heads 6 of two adjacent liquid cooling plates, and the crimping pipes 9 are connected to the connecting pipe heads 6; one end of the total water inlet pipe 7 is connected to the connecting pipe head 6 at the liquid inlet end 430 of the farthest liquid cooling plate, for providing heat exchange medium to the liquid cooling plate; one end of the total water outlet pipe 8 is connected to the connecting pipe head 6 at the liquid outlet end 440 of the farthest liquid cooling plate, for circulation of heat exchange medium in the liquid cooling plate.

[0056] Furthermore, the main water inlet pipeline 7 and the main water outlet pipeline 8 in this example are located on the same side and are arranged adjacent to each other.

[0057] It should be noted that the entire system adopts a full parallel design from front to back liquid cooling plates, and the total water inlet pipe 7 and the total water outlet pipe 8 are both on a single side of the liquid cooling plate. The advantage of this is that the assembly pipeline area is on a single collector of the liquid cooling plate. The single collector is machined with an integrated machine and has high precision, which solves the problem of high difficulty requirements for pipe crimping process due to entry and exit from both sides.

[0058] In a third aspect, the utility model further provides a battery pack, which includes the battery cooling system as described above.

[0059] Working principle:

[0060] The heat exchange medium flowing in the total water inlet pipeline 7 enters the second cavity 420 of each liquid cooling plate through a plurality of compression pipes 9 and connecting pipe heads 6, then passes through the S-shaped flow channel 200, the second collector 5 and the first harmonica tube 1 in sequence, and then enters the first cavity 410, and then is collected into the total water outlet pipeline 8 through a plurality of compression pipes 9 and connecting pipe heads 6 for output to the outside.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: The liquid cooling plate comprises a first harmonica tube (1), a second harmonica tube (2) and a reinforcing rib (3), wherein: The first harmonica tube (1) and the second harmonica tube (2) are arranged at intervals along the vertical direction of the liquid cooling plate, and a straight-flow channel is provided in the first harmonica tube (1), and a bending channel is provided in the second harmonica tube (2), the straight-flow channel is connected to the bending channel, and a heat exchange medium flows in the channels; The reinforcing rib (3) is fixed between the first harmonica tube (1) and the second harmonica tube (2), and the reinforcing rib (3) is used to prevent the harmonica tube from being squeezed and deformed.

2. The liquid cooling plate according to claim 1, characterized in that: The reinforcing rib (3) is equal in length to the first harmonica tube (1) and the second harmonica tube (2).

3. The liquid cooling plate according to claim 1, characterized in that: A plurality of first partitions (11) are arranged in the first harmonica tube (1), the first partitions (11) are arranged in an inclined manner, and the plurality of first partitions (11) are arranged at intervals along the height direction of the liquid cooling plate, so as to divide the inner cavity of the first harmonica tube (1) into a plurality of outlet group flow channels (100) which are not connected to each other, and the outlet group flow channels (100) serve as direct current channels of the first harmonica tube (1).

4. The liquid cooling plate according to claim 3, characterized in that: The second harmonica pipe (2) is provided with a plurality of second partitions (21), a plurality of third partitions (22), a plurality of fourth partitions (23) and two side blocking members (24), wherein: Both sides of the second harmonica pipe (2) are provided with openings, the second partition (21) and the fourth partition (23) are of equal length, and are shorter than the length of the second harmonica pipe (2), and longer than the length of the third partition (22); The second partition plate (21) is arranged on a side close to the reinforcing rib (3), the third partition plate (22) is arranged on a side of the second partition plate (21) away from the reinforcing rib (3), and the fourth partition plate (23) is arranged on a side of the third partition plate (22) away from the second partition plate (21); One side of the second partition plate (21) is flush with one side opening of the second harmonica pipe (2), and one side of the fourth partition plate (23) is flush with the other side opening of the second harmonica pipe (2); One side blocking member (24) is fixed between the inner wall of one opening of the second harmonica tube (2) and the second partition (21) away from the reinforcing rib (3), and the other side blocking member (24) is fixed between the inner wall of the other opening of the second harmonica tube (2) and the fourth partition (23) close to the third partition (22), so as to divide the inner cavity of the second harmonica tube (2) into an S-shaped flow channel (200), and the S-shaped flow channel (200) serves as a bending channel of the second harmonica tube (2).

5. The liquid cooling plate according to claim 4, characterized in that: The sizes of the two side blocking members (24) match the opening size of the second harmonica pipe (2), and the two side blocking members (24) are symmetrically arranged 180 degrees rotated around the center point of the second harmonica pipe (2).

6. The liquid cooling plate according to claim 4, characterized in that: It also includes a first current collector (4) and a second current collector (5), wherein: The first current collector (4) is arranged on one side of the first harmonica tube (1), the second harmonica tube (2) and the reinforcing rib (3); a first cavity (410) and a second cavity (420) are arranged in the first current collector (4); the first cavity (410) and the second cavity (420) are not connected to each other; the first cavity (410) is connected to one end of the outlet group flow channel (100); and the second cavity (420) is connected to one end of the S-shaped flow channel (200); The second current collector (5) is arranged on the other side of the first harmonica tube (1), the second harmonica tube (2) and the reinforcing rib (3); a third cavity (500) is arranged in the second current collector (5); the other end of the outlet group flow channel (100) and the other end of the S-shaped flow channel (200) are both in communication with the third cavity (500).

7. The liquid cooling plate according to claim 6, characterized in that: The first current collector (4) is provided with a liquid inlet end (430) and a liquid outlet end (440), and the liquid inlet end (430) and the liquid outlet end (440) are both arranged through one side of the first current collector (4), and the liquid inlet end (430) is connected to the second cavity (420), and the liquid outlet end (440) is connected to the first cavity (410), and connecting pipe heads (6) are arranged on both sides of the liquid inlet end (430) and the liquid outlet end (440).

8. A battery cooling system, comprising a plurality of liquid cooling plates according to any one of claims 1 to 7, characterized in that: It also includes a main water inlet pipeline (7), a main water outlet pipeline (8) and a plurality of compression pipelines (9), wherein: A plurality of liquid cooling plates are arranged in parallel and at intervals, and the battery cells are abutted between two adjacent liquid cooling plates; A plurality of compression pipes (9) are respectively arranged between the connecting pipe heads (6) of two adjacent liquid cooling plates, and the compression pipes (9) are connected to the connecting pipe heads (6); One end of the main water inlet pipeline (7) is connected to the connecting pipe head (6) at the liquid inlet end (430) of the farthest liquid cooling plate, and is used to provide heat exchange medium into the liquid cooling plate; One end of the total water outlet pipeline (8) is connected to the connecting pipe head (6) at the liquid outlet end (440) of the farthest liquid cooling plate, and is used for the circulation of heat exchange medium in the liquid cooling plate.

9. The battery cooling system according to claim 8, characterized in that: The main water inlet pipeline (7) and the main water outlet pipeline (8) are located on the same side and are arranged adjacent to each other.

10. A battery pack, characterized in that: The battery pack includes the battery cooling system as claimed in claim 8.

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