Battery cooling system and battery pack

Abstract

The battery cooling system comprises a plurality of liquid cooling plates, a connecting pipe fitting and a flow adjusting mechanism, the plurality of liquid cooling plates are sequentially arranged at intervals in the width direction of the liquid cooling plates, and heat exchange media flow in the liquid cooling plates; the plurality of connecting pipe fittings are respectively arranged between two adjacent liquid cooling plates and are used for respectively communicating the corresponding liquid inlet ends and the corresponding liquid outlet ends of the two adjacent liquid cooling plates; the flow adjusting mechanism is arranged among the plurality of liquid cooling plates, the flow adjusting mechanism is provided with a plurality of telescopic parts capable of linearly moving, the plurality of telescopic parts are arranged on the liquid cooling plates, and one end of each telescopic part penetrates through and extends into the liquid inlet end of the corresponding liquid cooling plate and is used for adjusting the flow of a heat exchange medium in the corresponding liquid cooling plate; the flow of each liquid cooling plate is independently adjusted through the flow adjusting mechanism, regional management is realized, the temperature field distribution of the whole battery system is effectively controlled, the local overheating or supercooling phenomenon is avoided, and the overall stability and safety of the battery system are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cooling system and battery pack. Background Technology

[0002] With the development and commercialization of electric vehicles, people's demand for fast charging of new energy electric vehicles is growing. Fast charging technology plays an irreplaceable role in the user experience of electric vehicles. In the process of achieving fast charging of battery packs, the large current and ultra-large current will cause the battery heat generation to increase sharply, resulting in a rapid rise in battery pack temperature. In severe cases, this can lead to thermal runaway, posing risks such as battery combustion and explosion. On the other hand, excessively high battery temperature will affect the battery's lifespan and the electric vehicle's driving range, resulting in a worse user experience.

[0003] A liquid cooling plate assembly, a battery assembly, and a vehicle are disclosed in CN219226418U. The liquid cooling plate assembly includes a harmonica tube and multiple cooling channels extending along the length of the harmonica tube. The two side walls of the harmonica tube in the thickness direction form a first heat dissipation part. The harmonica tube is disposed between two battery cells for heat dissipation of the side walls of the two battery cells. A cooling plate is disposed on at least one side in the width direction of the harmonica tube to form a second heat dissipation part for heat dissipation of the battery connecting piece connecting the two battery cells. The liquid cooling plate assembly uses the first heat dissipation part to cool the large surface of the side walls of the battery cells, and at the same time, it can also use the second heat dissipation part to absorb the heat generated when the current passes through the battery connecting piece, thereby cooling the battery connecting piece.

[0004] In the existing liquid cooling plate assembly technology mentioned above, the combination of harmonica tube and cooling plate is used to cool the battery cells. This may result in insufficient precision and intelligence in temperature control of different areas of the battery system. It is difficult to independently and accurately adjust the heat dissipation capacity according to the actual temperature requirements of each area of ​​the battery cells, and it is impossible to effectively control the temperature field distribution of the entire battery system. This may lead to overheating or overcooling of local battery cells, affecting battery performance, lifespan and safety. Utility Model Content

[0005] In view of this, the present invention proposes a battery cooling system and battery pack, which independently adjusts the flow rate of each liquid cooling plate through a flow regulation mechanism to achieve regional management, effectively control the temperature field distribution of the entire battery system, avoid local overheating or overcooling, and improve the overall stability and safety of the battery system.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides a battery cooling system, including multiple liquid cooling plates, connecting pipes, and a flow regulating mechanism, wherein...

[0007] Multiple liquid cooling plates are arranged at intervals along their width, and heat exchange medium flows inside the liquid cooling plates. The battery cells are arranged between two adjacent liquid cooling plates.

[0008] Multiple connecting pipes are installed between two adjacent liquid cooling plates to connect the corresponding liquid inlet ends and liquid outlet ends of the two adjacent liquid cooling plates respectively.

[0009] The flow regulation mechanism is set between multiple liquid cooling plates, and the flow regulation mechanism has multiple telescopic parts that can move linearly. The multiple telescopic parts are set on each liquid cooling plate, and one end of the telescopic part passes through and extends into the liquid inlet end of the liquid cooling plate, which is used to regulate the flow rate of the heat exchange medium in each liquid cooling plate.

[0010] Based on the above technical solutions, preferably, the liquid cooling plate includes a plate body, a first current collector, and a second current collector, wherein,

[0011] The plate body is provided with flow channels. The first current collector and the second current collector are respectively located on the two end faces of the plate body to block the two sides of the flow channels, so as to form an S-shaped flow channel.

[0012] The first collector has an inlet hole and an outlet hole. The inlet hole is connected to the inlet end of the flow channel, and the outlet hole is connected to the outlet end of the flow channel.

[0013] The telescopic part of the flow regulating mechanism extends into the liquid inlet hole to regulate the flow rate of the flow channel.

[0014] Based on the above technical solutions, preferably, the connecting pipe fitting includes multiple pipe joints and pipe fitting kits, wherein,

[0015] Each liquid cooling plate has a first through hole and a second through hole on its side. The first through hole is connected to the liquid inlet hole and the second through hole is connected to the liquid outlet hole.

[0016] Multiple pipe joints are located at both ends of each first through hole and second through hole, and the two are connected to each other;

[0017] Multiple pipe fittings are snapped between two adjacent pipe joints and sealed together to form parallel cooling branches.

[0018] Based on the above technical solutions, preferably, the pipe fitting kit includes an outer sleeve and a sealing sleeve, wherein the sealing sleeve is disposed inside the outer sleeve and the inner side of the sealing sleeve has a concave portion, and the pipe joint has a protrusion on the side away from the liquid cooling plate. The outer contour shape of the protrusion matches the inner contour shape of the concave portion. The pipe joint is inserted into the sealing sleeve, so that the protrusion is engaged in the concave portion to form a sealed connection.

[0019] Based on the above technical solutions, preferably, it also includes a main water inlet pipe and a main water outlet pipe, wherein one end of the main water inlet pipe is connected to the pipe joint at the first through hole of the farthest liquid cooling plate, for providing heat exchange medium into the liquid cooling plate; one end of the main water outlet pipe is connected to the pipe joint at the second through hole of the farthest liquid cooling plate, for circulating the heat exchange medium; the main water inlet pipe and the main water outlet pipe are respectively connected to the liquid inlet end and liquid outlet end of the external liquid supply equipment.

[0020] Based on the above technical solutions, preferably, the main water inlet pipe and the main water outlet pipe are located on the same side and are arranged adjacent to each other.

[0021] Based on the above technical solutions, preferably, the flow regulation mechanism includes a flexible circuit board, multiple solenoid valves, and a low-pressure plug, wherein,

[0022] The flexible circuit board is arranged between the tops of multiple first current collectors along the arrangement direction of the liquid cooling plate;

[0023] The number of multiple solenoid valves is equal to that of the liquid cooling plate, and all multiple solenoid valves are mounted on the flexible circuit board and electrically connected to the corresponding contacts on the flexible circuit board. The positions of the solenoid valves correspond to those of the first collector, and the valve body of the solenoid valve serves as the extension part of the flow regulating mechanism, extending through and into the liquid inlet.

[0024] The low-voltage plug is mounted on a flexible circuit board for electrical connection with the BMS battery management system, controlling the valve opening of the solenoid valve 32 to regulate the flow rate of the flow channel.

[0025] Based on the above technical solutions, preferably, it also includes multiple heat-conducting components, wherein the multiple heat-conducting components are respectively disposed between the upper pipe fitting and the flexible circuit board, and are used to support and dissipate heat for the flexible circuit board.

[0026] Based on the above technical solutions, preferably, the bottom of the heat-conducting component is arc-shaped and matches the outer diameter of the pipe fitting.

[0027] Secondly, the present invention also provides a battery pack, including a battery cooling system.

[0028] The battery cooling system and battery pack of this invention have the following advantages over the prior art:

[0029] The flow rate of each liquid cooling plate is independently adjusted by the flow regulation mechanism, realizing regional management, effectively controlling the temperature field distribution of the entire battery system, avoiding local overheating or overcooling, and improving the overall stability and safety of the battery system.

[0030] The pipe fitting is inserted into the sealing sleeve, and the protrusion engages with the concave part to form a sealed connection, which can effectively prevent the heat exchange medium from leaking during the flow process and ensure the normal operation of the battery cooling system.

[0031] By setting a flexible circuit board along the liquid cooling plate arrangement direction between the tops of multiple first current collectors, multiple solenoid valves are integrated on the flexible circuit board, which effectively saves space, makes the entire flow regulation mechanism compact, facilitates internal installation and layout, and improves battery density.

[0032] By designing heat-conducting components that contact the pipe fittings and flexible circuit boards, the overall heat transfer efficiency of the system is improved, and the curved surface constraint reduces vibration displacement and lowers the risk of contact failure. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a perspective view of the battery cooling system of this utility model;

[0035] Figure 2 This is a side view of the battery cooling system of this utility model;

[0036] Figure 3 This is a front view of the liquid cooling plate of the battery cooling system of this utility model;

[0037] Figure 4 The battery cooling system of this utility model Figure 3 Sectional view at point AA;

[0038] Figure 5 The battery cooling system of this utility model Figure 4 A magnified view of section B in the diagram;

[0039] Figure 6 The battery cooling system of this utility model Figure 2 Sectional view at CC;

[0040] Figure 7 The battery cooling system of this utility model Figure 6 A magnified view of part D in the diagram;

[0041] Figure 8 This is a top view of the battery cooling system of this utility model;

[0042] Figure 9 This is a perspective view of the battery pack of this utility model. Detailed Implementation

[0043] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0044] like Figure 1-8 As shown, a battery cooling system of this utility model includes multiple liquid cooling plates 1, connecting pipes 2, and a flow regulating mechanism 3. The multiple liquid cooling plates 1 are arranged sequentially at intervals along their width direction, and a heat exchange medium flows inside the liquid cooling plates 1. The battery cell is disposed between two adjacent liquid cooling plates 1. Multiple connecting pipes 2 are disposed between two adjacent liquid cooling plates 1 to connect the corresponding liquid inlet ends and liquid outlet ends of the two adjacent liquid cooling plates 1. The flow regulating mechanism 3 is disposed between the multiple liquid cooling plates 1 and has multiple linearly movable telescopic parts. The multiple telescopic parts are disposed on each liquid cooling plate 1, and one end of the telescopic part penetrates and extends into the liquid inlet end of the liquid cooling plate 1 to regulate the flow rate of the heat exchange medium in each liquid cooling plate 1.

[0045] It should be noted that this system collects temperature data from each cell and different areas through the battery system's temperature acquisition system, and uploads the temperature signals to the BMS (Battery Management System). The BMS determines whether the battery system needs heating or cooling based on the temperature signals and sends corresponding requests to the vehicle. When heating is required, the vehicle sends a heating signal to the thermal management unit and starts the water pump; when cooling is required, the vehicle sends a cooling signal to the thermal management unit and starts the water pump. Combined with the extension and retraction of the flow regulation mechanism 3, the flow rate of the heat exchange medium of each liquid cooling plate 1 is adjusted to achieve intelligent temperature control of each area of ​​the battery system. Furthermore, through regional management and precise control of the flow regulation mechanism 3, the temperature field distribution of the entire battery system can be effectively controlled to ensure that the cells are at the most favorable operating temperature.

[0046] In this embodiment, the liquid cooling plate 1 includes a plate body 11, a first current collector 12, and a second current collector 13. The plate body 11 has a flow channel 100. The first current collector 12 and the second current collector 13 are respectively disposed on the two end faces of the plate body 11 to block the two sides of the flow channel 100, forming an S-shaped flow channel 100. The first current collector 12 has an inlet hole 120 and an outlet hole 121. The inlet hole 120 is connected to the inlet end of the flow channel 100, and the outlet hole 121 is connected to the outlet end of the flow channel 100. The telescopic part of the flow regulating mechanism 3 extends into the inlet hole 120 to regulate the flow rate of the flow channel 100.

[0047] It should be noted that the plate 11 is provided with a flow channel 100 to accommodate the flow of the heat exchange medium. The flow channel 100 is designed in an S-shape to increase the flow path of the heat exchange medium in the plate 11, so that the heat exchange is more complete and thus improves the heat exchange efficiency.

[0048] In this embodiment, when the battery system needs cooling, the heat exchange medium enters the flow channel 100 of the liquid cooling plate 1 through the liquid inlet 120, flows along an S-shaped path, exchanges heat with the battery cell, and absorbs the heat generated by the battery cell. Then, the heat exchange medium is discharged from the liquid cooling plate 1 through the liquid outlet 121 and enters the circulation loop of the thermal management system. During this process, the extension and retraction part of the flow regulation mechanism 3 adjusts the opening size of the liquid inlet 120 according to the instructions of the BMS, thereby controlling the flow rate of the heat exchange medium entering the liquid cooling plate 1. By precisely controlling the flow rate of the heat exchange medium in each liquid cooling plate 1, precise temperature control of different areas of the battery system can be achieved.

[0049] In this embodiment, the connecting pipe fitting 2 includes multiple pipe joints 21 and pipe fitting kits 22. Each liquid cooling plate 1 has a first through hole 130 and a second through hole 140 on its side. The first through hole 130 is connected to the liquid inlet hole 120, and the second through hole 140 is connected to the liquid outlet hole 121. Multiple pipe joints 21 are respectively located at both ends of each first through hole 130 and second through hole 140, and are connected to each other. Multiple pipe fitting kits 22 are respectively snapped between two adjacent pipe joints 21 and are sealed between them to form parallel cooling branches.

[0050] It should be noted that the pipe fitting 22 is snapped between two adjacent pipe joints 21 to achieve a sealed connection between them. Multiple liquid cooling plates 1 are interconnected through pipe joints 22 and pipe fitting 21 to form parallel cooling branches. Each cooling branch can independently introduce and discharge heat exchange medium, thereby achieving independent temperature control of different areas of the battery system.

[0051] In this embodiment, in the battery cooling system, the heat exchange medium enters the flow channel 100 of the liquid cooling plate 1 through the inlet hole 120, flows along an S-shaped path, and exchanges heat with the battery cell. Then, the heat exchange medium is discharged from the liquid cooling plate 1 through the outlet 121 and enters the pipe joint 21 connected to it. At the pipe joint 22, the heat exchange medium is guided to the adjacent liquid cooling plate 1 or cooling branch to continue to participate in the heat exchange process. Through multiple parallel cooling branches, uniform and efficient cooling of various areas of the battery system can be achieved. Furthermore, through the design of parallel cooling branches, uniform and efficient cooling of various areas of the battery system can be achieved, thereby improving cooling efficiency.

[0052] The pipe fitting kit 22 in this embodiment includes an outer tube 221 and a sealing sleeve 222. The sealing sleeve 222 is disposed inside the outer tube 221, and a recess 220 is provided on the inner side of the sealing sleeve 222. The pipe connector 21 has a protrusion 210 on the side away from the liquid cooling plate 1. The outer contour shape of the protrusion 210 matches the inner contour shape of the recess 220. The pipe connector 21 is inserted into the sealing sleeve 222, so that the protrusion 210 is engaged in the recess 220 to form a sealed connection.

[0053] It should be noted that when the pipe joint 21 is inserted into the sealing sleeve 22, the protrusion 210 is engaged in the concave part 220 to form a sealed connection, which can effectively prevent the heat exchange medium from leaking during the flow process and ensure the normal operation of the battery cooling system.

[0054] This embodiment also includes a main water inlet pipe 4 and a main water outlet pipe 5. One end of the main water inlet pipe 4 is connected to the pipe joint 21 at the first through hole 130 of the farthest liquid cooling plate 1, and is used to provide heat exchange medium into the liquid cooling plate. One end of the main water outlet pipe 5 is connected to the pipe joint 21 at the second through hole 140 of the farthest liquid cooling plate 1, and is used for the circulation of heat exchange medium. The main water inlet pipe 4 and the main water outlet pipe 5 are respectively connected to the liquid inlet end and the liquid outlet end of the external liquid supply equipment.

[0055] Furthermore, the main water inlet pipe 4 and the main water outlet pipe 5 are located on the same side and are arranged adjacent to each other.

[0056] It should be noted that the entire system adopts a fully parallel design from front to back liquid cooling plate 1. The main water inlet pipe 4 and the main water outlet pipe 5 are both on one side of liquid cooling plate 1, which facilitates the assembly of the pipeline area on a single current collector of liquid cooling plate 1. The single current collector is machined as a whole with high precision, which solves the problem of high difficulty in pipeline crimping process due to the two sides of the inlet and outlet, and improves the space utilization of the battery pack.

[0057] The flow regulation mechanism 3 in this embodiment includes a flexible circuit board 31, multiple solenoid valves 32, and a low-pressure plug 33. The flexible circuit board 31 is arranged between the tops of multiple first current collectors 12 along the arrangement direction of the liquid cooling plate 1. The number of multiple solenoid valves 32 is equal to that of the liquid cooling plate 1, and all multiple solenoid valves 32 are arranged on the flexible circuit board 31 and electrically connected to corresponding contacts on the flexible circuit board 31. The positions of the solenoid valves 32 correspond to those of the first current collectors 12. The valve body of the solenoid valve 32 serves as the extension and retraction part of the flow regulation mechanism 3, penetrating and extending into the liquid inlet 120. The low-pressure plug 33 is arranged on the flexible circuit board 31 and is used to electrically connect with the BMS battery management system to control the valve body opening of the solenoid valve 32 to regulate the flow rate of the flow channel 100.

[0058] It should be noted that in the battery cooling system, when it is necessary to adjust the flow rate of the heat exchange medium of a certain liquid cooling plate 1, the BMS will send a command to the low-pressure plug-in 33. After receiving the command, the low-pressure plug-in 33 transmits the signal to the corresponding solenoid valve 31 through the flexible circuit board 32. The solenoid valve 31 adjusts the opening of the valve body according to the signal, thereby changing the flow rate of the heat exchange medium entering the liquid cooling plate. This can achieve precise temperature control of different areas of the battery system. Furthermore, the flexible circuit board 31 is arranged along the arrangement direction of the liquid cooling plates 1 between the tops of multiple first current collectors 12, integrating multiple solenoid valves 32 on the flexible circuit board 31, effectively saving space and making the entire flow regulation mechanism 3 compact, facilitating internal installation and layout, and improving battery density.

[0059] This embodiment also includes multiple heat-conducting components 6, which are disposed between the upper pipe fittings 22 and the flexible circuit board 31, and are used to support and dissipate heat for the flexible circuit board 31.

[0060] It should be noted that the heat-conducting component 6 forms a low thermal resistance contact interface with the pipe fitting 22 and the flexible circuit board 2 through a high thermal conductivity material, which significantly improves the overall heat conduction efficiency of the system. In addition, the heat-conducting component 6 uses thermally conductive silicone material to provide vibration-resistant support for the flexible circuit board 31, reducing the relative displacement between the flexible circuit board 31 and the liquid cooling plate 1, and avoiding contact surface separation or friction damage caused by vibration.

[0061] In this embodiment, the bottom of the heat-conducting component 6 is arc-shaped and matches the outer diameter of the pipe fitting 22.

[0062] It should be noted that the bottom of the heat-conducting component 6 is arc-shaped and matches the outer diameter of the pipe fitting 22. This can eliminate the local gaps caused by traditional planar contact, improve heat conduction efficiency, and reduce vibration displacement and contact failure risk through curved surface constraints.

[0063] like Figure 9As shown, in a second aspect, the present invention also provides a battery pack, including a battery cooling system.

[0064] In this embodiment, when the electrical temperature in a certain area exceeds the high temperature threshold, the battery cooling process is initiated. The BMS requests battery cooling, the vehicle compressor starts to cool the battery, and the water pump starts. It checks whether there is a battery cooling exit signal. If there is an exit signal, it returns to the previous step to detect the battery cooling signal. If there is no exit signal, it continues to check whether the difference between the highest and lowest temperatures sampled by the NTC is greater than or equal to 2°C. If the temperature difference is less than 2°C, the compressor and water pump are turned off. If the temperature difference is greater than or equal to 2°C, the solenoid valve 32 corresponding to the lowest temperature NTC cell is opened to cool it down. After a delay of 60 seconds, the solenoid valve 32 opened in the previous step is closed, and the compressor and water pump are turned off, ending the process.

[0065] In this embodiment, when the electrical temperature in a certain area exceeds the low temperature threshold, the battery heating process is initiated. The BMS requests battery heating, the vehicle compressor starts, and heating begins. The water pump starts, and it is determined whether there is a signal to exit battery cooling. If there is an exit signal, the process returns to the previous step to detect the battery heating signal. If there is no exit signal, it continues to check whether the difference between the highest and lowest temperatures sampled by the NTC is greater than or equal to 2°C. If the temperature difference is less than 2°C, the compressor and water pump are turned off. If the temperature difference is greater than or equal to 2°C, the solenoid valve 32 corresponding to the highest temperature NTC cell is opened to raise the temperature. After a delay of 60 seconds, the solenoid valve 32 opened in the previous step is closed, and the compressor and water pump are turned off, ending the process.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cooling system, characterized by, It includes multiple liquid cooling plates (1), connecting pipes (2), and a flow regulating mechanism (3), wherein, Multiple liquid cooling plates (1) are arranged in sequence at intervals along their width direction. A heat exchange medium flows inside the liquid cooling plates (1), and the battery cell is arranged between two adjacent liquid cooling plates (1). Multiple connecting pipes (2) are respectively installed between two adjacent liquid cooling plates (1) to connect the corresponding liquid inlet ends and liquid outlet ends of the two adjacent liquid cooling plates (1); The flow regulation mechanism (3) is set between multiple liquid cooling plates (1), and the flow regulation mechanism (3) has multiple telescopic parts that can move linearly. The multiple telescopic parts are set on each liquid cooling plate (1), and one end of the telescopic part passes through and extends into the liquid inlet end of the liquid cooling plate (1) to regulate the flow rate of the heat exchange medium in each liquid cooling plate (1).

2. The battery cooling system of claim 1, wherein: The liquid cooling plate (1) includes a plate body (11), a first current collector (12), and a second current collector (13), wherein, The plate (11) is provided with a flow channel (100). The first collector (12) and the second collector (13) are respectively located on the two end faces of the plate (11) to block the two sides of the flow channel (100) so that it forms an S-shaped flow channel (100). The first collector (12) is provided with an inlet hole (120) and an outlet hole (121). The inlet hole (120) is connected to the inlet end of the flow channel (100), and the outlet hole (121) is connected to the outlet end of the flow channel (100). The telescopic part of the flow regulating mechanism (3) extends into the inlet hole (120) to regulate the flow rate of the flow channel (100).

3. The battery cooling system of claim 2, wherein: The connecting pipe fitting (2) includes multiple pipe joints (21) and pipe fitting kits (22), wherein, Each liquid cooling plate (1) has a first through hole (130) and a second through hole (140) on its side. The first through hole (130) is connected to the liquid inlet hole (120), and the second through hole (140) is connected to the liquid outlet hole (121). Multiple pipe joints (21) are located at both ends of each first through hole (130) and second through hole (140), and the two are connected to each other; Multiple pipe fittings (22) are snapped between two adjacent pipe fittings (21) and sealed together to form parallel cooling branches.

4. The battery cooling system of claim 3, wherein: The pipe fitting kit (22) includes an outer tube (221) and a sealing sleeve (222). The sealing sleeve (222) is located inside the outer tube (221), and a recess (220) is provided on the inner side of the sealing sleeve (222). A protrusion (210) is provided on the side of the pipe joint (210) away from the liquid cooling plate (1). The outer contour shape of the protrusion (210) matches the inner contour shape of the recess (220). The pipe joint (21) is inserted into the sealing sleeve (222), so that the protrusion (210) is engaged in the recess (220) to form a sealed connection.

5. The battery cooling system of claim 3, wherein: It also includes a main water inlet pipe (4) and a main water outlet pipe (5). One end of the main water inlet pipe (4) is connected to the pipe joint (21) at the first through hole (130) of the farthest liquid cooling plate (1) to provide heat exchange medium to the liquid cooling plate. One end of the main water outlet pipe (5) is connected to the pipe joint (21) at the second through hole (140) of the farthest liquid cooling plate (1) to circulate the heat exchange medium. The main water inlet pipe (4) and the main water outlet pipe (5) are respectively connected to the inlet and outlet of the external liquid supply equipment.

6. The battery cooling system of claim 5, wherein: The main inlet pipe (4) and the main outlet pipe (5) are located on the same side and are adjacent to each other.

7. The battery cooling system of claim 3, wherein: The flow regulation mechanism (3) includes a flexible circuit board (31), multiple solenoid valves (32), and a low-pressure plug (33), wherein, The flexible circuit board (31) is disposed between the tops of multiple first current collectors (12) along the arrangement direction of the liquid cooling plate (1); The number of multiple solenoid valves (32) is equal to that of the liquid cooling plate (1), and the multiple solenoid valves (32) are all mounted on the flexible circuit board (31) and electrically connected to the corresponding contacts on the flexible circuit board (31). The positions of the solenoid valves (32) and the first collector (12) are correspondingly arranged. The valve body of the solenoid valve (32) serves as the extension part of the flow regulating mechanism (3) and extends through and into the liquid inlet hole (120). The low-voltage plug (33) is mounted on the flexible circuit board (31) for electrical connection with the BMS battery management system and for controlling the valve body opening of the solenoid valve 32 (32) to regulate the flow rate of the flow channel (100).

8. The battery cooling system of claim 7, wherein: It also includes multiple heat-conducting components (6), wherein the multiple heat-conducting components (6) are respectively disposed between the pipe fittings (22) and the flexible circuit board (31) above, and are used to support and dissipate heat for the flexible circuit board (31).

9. The battery cooling system as described in claim 8, characterized in that: The bottom of the heat-conducting component (6) is arc-shaped and matches the outer diameter of the pipe fitting (22).

10. A battery pack, characterized in that, Includes the battery cooling system as described in any one of claims 1-9.

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