Immersed cooling system for battery pack

Abstract

The embodiment of the utility model discloses a battery pack immersed cooling system, which comprises a battery pack, a first liquid storage tank and a second liquid storage tank, the battery pack comprises a battery cell and a shell, the shell is provided with a first liquid inlet, a first liquid return port and a cooling liquid accommodating cavity, the cooling liquid accommodating cavity is respectively communicated with the first liquid inlet and the first liquid return port, and the second liquid storage tank is communicated with the second liquid storage tank. The battery cell is immersed in the cooling liquid in the cooling liquid accommodating cavity; the first liquid storage tank is provided with a second liquid inlet, a second liquid return port and a first liquid accommodating cavity, the first liquid inlet is communicated with the second liquid return port, and the first liquid accommodating cavity is respectively communicated with the second liquid inlet and the second liquid return port; the second liquid storage tank is provided with a third liquid inlet, a third liquid return port and a second liquid accommodating cavity, the third liquid inlet is communicated with the first liquid return port, the third liquid return port is communicated with the second liquid inlet, and the second liquid accommodating cavity is respectively communicated with the second liquid inlet and the second liquid return port, so that the liquid leakage risk of the battery pack can be reduced; and the safety and the reliability of the battery pack are greatly improved.

Description

Technical Field

[0001] This application relates to the field of immersion liquid cooling technology, and more particularly to a battery pack immersion cooling system. Background Technology

[0002] Immersion battery cooling technology is a cooling technique that directly immerses battery cells in coolant, aiming to improve battery thermal management efficiency and safety. The basic principle of immersion battery cooling is to immerse the battery in coolant, using a highly efficient insulating fluorinated liquid as the coolant to absorb the heat generated by the battery and create a temperature gradient, thereby achieving efficient heat transfer and heat exchange with the individual cells within the battery pack. However, immersion cooling technology places high demands on the sealing of the battery module; insufficient sealing can easily lead to problems such as leakage and corrosion. Utility Model Content

[0003] To address the shortcomings of existing technologies, this application provides a battery pack immersion cooling system that can reduce the pressure of coolant flowing inside the battery pack, thereby reducing the risk of battery pack leakage and greatly improving the safety and reliability of the battery pack.

[0004] To address the aforementioned problems, this application provides a battery pack immersion cooling system, comprising:

[0005] A battery pack includes at least one battery cell and a housing. The housing has a first liquid inlet, a first liquid outlet, and a coolant containment cavity, which is connected to the first liquid inlet and the first liquid outlet, respectively.

[0006] The first liquid storage tank is provided with a second liquid inlet, a second liquid return outlet and a first liquid receiving cavity. The first liquid inlet is connected to the second liquid return outlet, and the first liquid receiving cavity is connected to the second liquid inlet and the second liquid return outlet respectively.

[0007] The second liquid storage tank is provided with a third liquid inlet, a third liquid return outlet and a second liquid receiving cavity. The third liquid inlet is connected to the first liquid return outlet and the third liquid return outlet is connected to the second liquid inlet. The second liquid receiving cavity is connected to the second liquid inlet and the second liquid return outlet respectively.

[0008] The coolant containment chamber is filled with coolant, and the battery cell is located inside the coolant containment chamber and submerged in the coolant.

[0009] Furthermore, in the battery pack immersion cooling system provided in this application, the battery pack immersion cooling system also includes: a heat exchanger;

[0010] The heat exchanger is equipped with a fourth liquid inlet and a fourth liquid return port. The fourth liquid inlet is connected to the third liquid return port, and the fourth liquid return port is connected to the second liquid inlet.

[0011] Furthermore, in the battery pack immersion cooling system provided in this application, the battery pack immersion cooling system also includes: a return water pump;

[0012] The return water pump is configured to transport the coolant in the second liquid containment chamber to the first liquid containment chamber via the heat exchanger.

[0013] Furthermore, in the battery pack immersion cooling system provided in this application, the return water pump includes: a first water pump and a second water pump;

[0014] One end of the first water pump is connected to the second inlet, and the other end of the first water pump is connected to the fourth return port; one end of the second water pump is connected to the third return port, and the other end of the second water pump is connected to the fourth inlet.

[0015] Furthermore, in the battery pack immersion cooling system provided in this application, the battery pack immersion cooling system also includes: a switching circuit;

[0016] The switching circuit is electrically connected to the first water pump and the second water pump respectively; the switching circuit is configured to control the start and stop of the first water pump and the second water pump.

[0017] Furthermore, in the battery pack immersion cooling system provided in this application, the switching circuit includes: an interlocking switch;

[0018] The linkage switch is electrically connected to the first water pump and the second water pump respectively. The linkage switch is configured such that when the linkage switch is closed, the first water pump and the second water pump start simultaneously; when the linkage switch is open, the first water pump and the second water pump stop working simultaneously.

[0019] Furthermore, in the battery pack immersion cooling system provided in this application, the return water pump also includes: a third water pump and a fourth water pump;

[0020] Among them, one end of the third water pump is connected to the first liquid inlet, and the other end of the third water pump is connected to the second liquid return port; one end of the fourth water pump is connected to the first liquid return port, and the other end of the fourth water pump is connected to the third liquid inlet.

[0021] Furthermore, in the battery pack immersion cooling system provided in this application, the first water pump, the second water pump, the third water pump, and the fourth water pump are configured to start and stop simultaneously.

[0022] Furthermore, in the battery pack immersion cooling system provided in this application, the first liquid inlet and the first liquid outlet are respectively located on both sides of the housing; or / and,

[0023] The second inlet and the second outlet are respectively located on both sides of the first storage tank; or / and,

[0024] The third inlet and the third outlet are located on both sides of the second storage tank.

[0025] Furthermore, in the battery pack immersion cooling system provided in this application, the first inlet is located near the top of the coolant reservoir, and the first outlet is located near the bottom of the coolant reservoir; or / and,

[0026] The second inlet is located near the top of the first liquid receiving cavity, and the second outlet is located near the bottom of the first liquid receiving cavity; or / and,

[0027] The third inlet is located near the top of the second liquid container, and the third return outlet is located near the bottom of the second liquid container.

[0028] The battery pack immersion cooling system provided in this application includes a battery pack, a first liquid storage tank, and a second liquid storage tank. The battery pack includes at least one battery cell and a housing. The housing has a first liquid inlet, a first liquid outlet, and a coolant containment chamber. The coolant containment chamber is connected to the first liquid inlet and the first liquid outlet, and is filled with coolant. The battery cell is disposed in the coolant containment chamber and is immersed in the coolant. The first liquid storage tank has a second liquid inlet, a second liquid outlet, and a first liquid containment chamber. The first liquid inlet is connected to the second liquid outlet, and the first liquid containment chamber is connected to the first liquid inlet and the first liquid outlet, respectively. The second liquid inlet and the second liquid outlet are connected; the second liquid storage tank is provided with a third liquid inlet, a third liquid outlet and a second liquid containment chamber. The third liquid inlet is connected to the first liquid outlet, the third liquid outlet is connected to the second liquid inlet, and the second liquid containment chamber is connected to both the second liquid inlet and the second liquid outlet. Thus, when the coolant circulates, the pressure of the coolant flowing in the battery pack can be reduced through the first liquid storage tank at the first liquid inlet and the second liquid storage tank at the first liquid outlet, thereby reducing the risk of leakage of the battery pack and greatly improving the safety and reliability of the battery pack. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a first schematic block diagram of a battery pack immersion cooling system provided in an embodiment of this application;

[0031] Figure 2 This is a second schematic block diagram of a battery pack immersion cooling system provided in an embodiment of this application.

[0032] Reference numerals: 100 is the battery pack, 110 is the battery cell, 120 is the casing, 101 is the first liquid inlet, 102 is the first liquid return outlet, 103 is the coolant storage chamber, 200 is the first liquid storage tank, 201 is the second liquid inlet, 202 is the second liquid return outlet, 203 is the first liquid storage chamber, 300 is the second liquid storage tank, 301 is the third liquid inlet, 302 is the third liquid return outlet, 303 is the second liquid storage chamber, 400 is the heat exchanger, 401 is the fourth liquid inlet, 402 is the fourth liquid return outlet, 500 is the return water pump, 501 is the first water pump, 502 is the second water pump, 600 is the liquid cooling pipe, and 700 is the switching circuit. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0035] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0037] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0038] Please see Figure 1 , Figure 1 This is a first schematic block diagram of a battery pack immersion cooling system provided in an embodiment of this application. Figure 1 As shown, this application provides a battery pack immersion cooling system, which includes:

[0039] The battery pack 100 includes at least one battery cell 110 and a housing 120. The housing 120 is provided with a first liquid inlet 101, a first liquid outlet 102 and a coolant accommodating cavity 103. The coolant accommodating cavity 103 is connected to the first liquid inlet 101 and the first liquid outlet 102 respectively.

[0040] The first liquid storage tank 200 is provided with a second liquid inlet 201, a second liquid return outlet 202 and a first liquid receiving cavity 203. The first liquid inlet 201 is connected to the second liquid return outlet 202, and the first liquid receiving cavity 203 is connected to the second liquid inlet 201 and the second liquid return outlet 202 respectively.

[0041] The second liquid storage tank 300 is provided with a third liquid inlet 301, a third liquid return outlet 302 and a second liquid receiving cavity 303. The third liquid inlet 301 is connected to the first liquid return outlet 102, the third liquid return outlet 302 is connected to the second liquid inlet 201, and the second liquid receiving cavity 303 is connected to the second liquid inlet 201 and the second liquid return outlet 202 respectively.

[0042] The coolant accommodating cavity 103 is filled with coolant, and the battery cell 110 is located in the coolant accommodating cavity 103 and is submerged in the coolant.

[0043] In this embodiment, a first liquid inlet 101 of the battery pack 100 is provided with a first liquid storage tank 200, and a second liquid storage tank 300 is provided with a first liquid return port 102 of the battery pack 100. The first liquid storage tank 200 and the second liquid storage tank 300 can serve as regulating tanks for adjusting the flow pressure of the coolant inside the battery pack 100. The coolant in the first liquid storage tank 200 can flow into the coolant receiving cavity 103 through the first liquid inlet 101 to cool the battery cells 110 inside the battery pack 100, and can also flow into the second liquid storage tank 300 through the first liquid return port 102. The coolant in the second liquid storage tank 300 can flow into the first liquid storage tank 200 through the third liquid return port 302, thereby realizing the circulation of coolant in the battery pack immersion cooling system.

[0044] Meanwhile, the flow pressure of the coolant in the first reservoir 200 to the coolant in the coolant accommodating cavity 103 can be transferred from the coolant in the coolant accommodating cavity 103 to the coolant in the second reservoir 300. This can greatly reduce the flow pressure of the coolant in the coolant accommodating cavity 103, thereby reducing the risk of leakage of the battery pack 100 and greatly improving the safety and reliability of the battery pack 100.

[0045] The battery pack immersion cooling system provided in this application includes a battery pack 100, a first liquid storage tank 200, and a second liquid storage tank 300. The battery pack 100 includes at least one battery cell 110 and a housing 120. The housing 120 is provided with a first liquid inlet 101, a first liquid outlet 102, and a coolant containment cavity 103. The coolant containment cavity 103 is connected to the first liquid inlet 101 and the first liquid outlet 102, and is filled with coolant. The battery cell 110 is disposed in the coolant containment cavity 103 and is immersed in the coolant. The first liquid storage tank 200 is provided with a second liquid inlet 201, a second liquid outlet 202, and a first liquid containment cavity 303. The first liquid inlet 101 is connected to the second liquid outlet 202, and the first liquid containment cavity 303 is connected to the second liquid outlet 202. 3 is connected to the second liquid inlet 201 and the second liquid return outlet 202 respectively; the second liquid storage tank 300 is provided with a third liquid inlet 301, a third liquid return outlet 302 and a second liquid containment chamber 303. The third liquid inlet 301 is connected to the first liquid return outlet 102, the third liquid return outlet 302 is connected to the second liquid inlet 201, and the second liquid containment chamber 303 is connected to the second liquid inlet 201 and the second liquid return outlet 202 respectively. Thus, when the coolant is circulating, the pressure of the coolant flowing in the battery pack 100 can be reduced through the first liquid storage tank 200 at the first liquid inlet 101 and the second liquid storage tank 300 at the first liquid return outlet 102, thereby reducing the risk of leakage of the battery pack 100 and greatly improving the safety and reliability of the battery pack 100.

[0046] In some embodiments, such as Figure 1 As shown, the battery pack immersion cooling system also includes a heat exchanger 400; wherein the heat exchanger 400 is provided with a fourth liquid inlet 401 and a fourth liquid return port 402, the fourth liquid inlet 401 is connected to the third liquid return port 302, and the fourth liquid return port 402 is connected to the second liquid inlet 201.

[0047] Specifically, a heat exchanger 400 is a device used to transfer part of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Its main function is to bring the fluid temperature up to the required process temperature through heat transfer, and it is widely used in various industrial fields such as chemical, petroleum, power, and food.

[0048] In this embodiment, by providing a heat exchanger 400 outside the battery pack 100, not only can the sealing pressure of the battery pack 100 be reduced, but the heat dissipation efficiency of the battery pack 100 can also be improved. Specifically, the temperature of the coolant at the fourth inlet 401 is higher than the temperature of the coolant at the fourth outlet 402.

[0049] Specifically, during normal operation of the battery pack immersion cooling system, after the coolant in the battery pack 100 cools the cells 110, it can flow into the second storage tank 300 through the first return port 102. The coolant in the second storage tank 300 can flow into the heat exchanger 400 through the third return port 302 for cooling, and then flow into the first storage tank 200 through the fourth return port 402 of the heat exchanger 400. The coolant in the first storage tank 200 can flow into the battery pack 100 through the first inlet port 101 to cool the cells 110.

[0050] Furthermore, in some embodiments, such as Figure 1 As shown, the battery pack immersion cooling system also includes a return water pump 500; wherein the return water pump 500 is configured to transport the coolant in the second liquid containment chamber 303 to the first liquid containment chamber 203 via the heat exchanger 400.

[0051] In this embodiment, the return water pump 500 can drive the coolant to circulate in the battery pack immersion cooling system, so that the coolant can continuously cool the battery pack 100. At the same time, the return water pump can also control the flow rate of the coolant in the battery pack immersion cooling system, thereby maximizing the heat dissipation effect of the battery pack 100 with minimal cost.

[0052] Furthermore, in some embodiments, such as Figure 1 As shown, the return water pump 500 includes: a first water pump 501 and a second water pump 502; wherein, one end of the first water pump 501 is connected to the second inlet 201, and the other end of the first water pump 501 is connected to the fourth return water port 402; one end of the second water pump 502 is connected to the third return water port 302, and the other end of the second water pump 502 is connected to the fourth inlet 401.

[0053] In this embodiment, the battery pack immersion cooling system can be equipped with two water pumps, namely a first water pump 501 and a second water pump 502. Both the first water pump 501 and the second water pump 502 are located outside the battery pack 100. The first water pump 501 is located between the fourth return port 402 of the heat exchanger 400 and the second inlet port 201 of the first liquid storage tank 200. The second water pump 502 is located between the fourth inlet port 401 of the heat exchanger 400 and the third return port 302 of the second liquid storage tank 300. This can provide two opposite pressures to the battery pack 100, thereby reducing the pressure of the coolant inside the battery pack 100, reducing the risk of leakage of the battery pack 100, and greatly improving the safety and reliability of the battery pack 100.

[0054] The first water pump 501 is connected to the second liquid inlet 201 by a liquid cooling pipe 600, and the other end of the first water pump 501 is connected to the fourth liquid return port 402 by a liquid cooling pipe 600. The second water pump 502 is connected to the third liquid return port 302 by a liquid cooling pipe 600, and the other end of the second water pump 502 is connected to the fourth liquid inlet 401 by a liquid cooling pipe 600.

[0055] In some embodiments, such as Figure 2 As shown, the battery pack immersion cooling system also includes a switching circuit 700; wherein the switching circuit 700 is electrically connected to the first water pump 501 and the second water pump 502 respectively; the switching circuit 700 is configured to control the start and stop of the first water pump 501 and the second water pump 502.

[0056] In this embodiment, the battery pack immersion cooling system is further provided with a switching circuit 700 for controlling the start and stop of the first water pump 501 and the second water pump 502. Thus, when the battery pack immersion cooling system is not working, the switching circuit 700 can be used to control the first water pump 501 and the second water pump 502 to stop working; when the battery pack immersion cooling system is working, the switching circuit 700 can be used to control the first water pump 501 and the second water pump 502 to start, so that the first water pump 501 and the second water pump 502 control the coolant to circulate in the battery pack immersion cooling system to cool and dissipate heat from the battery pack 100.

[0057] Furthermore, in some embodiments, such as Figure 2 As shown, the switch circuit 700 includes: a linkage switch K1; wherein, the linkage switch K1 is electrically connected to the first water pump 501 and the second water pump 502 respectively; the linkage switch K1 is configured such that: when the linkage switch K1 is closed, the first water pump 501 and the second water pump 502 start simultaneously; when the linkage switch K1 is open, the first water pump 501 and the second water pump 502 stop working simultaneously.

[0058] In this embodiment, the switching circuit 700 is equipped with a linkage switch K1. The linkage switch K1 can control the first water pump 501 and the second water pump 502 to start simultaneously, or control the first water pump 501 and the second water pump 502 to stop working simultaneously. This can prevent the other water pump from continuing to work after a single water pump fails, thereby further improving the reliability of the battery pack immersion cooling system.

[0059] Specifically, when the linkage switch K1 is closed, the first water pump 501 and the second water pump 502 can start simultaneously; when the linkage switch K1 is open, the first water pump 501 and the second water pump 502 stop working simultaneously.

[0060] In some embodiments, the return water pump 500 further includes a third water pump and a fourth water pump; wherein one end of the third water pump is connected to the first inlet 101 and the other end of the third water pump is connected to the second return water port 202; one end of the fourth water pump is connected to the first return water port 102 and the other end of the fourth water pump is connected to the third inlet 301.

[0061] In this embodiment, a third water pump can be installed between the first inlet 101 and the second outlet 202, and a fourth water pump can be installed between the first outlet 102 and the third inlet 301. This further reduces the pressure of the coolant flowing within the battery pack 100 and allows for more precise control of the heat exchange efficiency of the battery pack 100. Furthermore, the start and stop of the third and fourth water pumps can be controlled by the switching circuit 700.

[0062] Furthermore, in some embodiments, the first water pump 501, the second water pump 502, the third water pump, and the fourth water pump are configured to start and stop simultaneously.

[0063] In this embodiment, the first water pump 501, the second water pump 502, the third water pump, and the fourth water pump can be configured to start and stop simultaneously, and are controlled by the linkage switch K1 in the switching circuit 700. When the linkage switch K1 is closed, the first water pump 501, the second water pump 502, the third water pump, and the fourth water pump can start simultaneously; when the linkage switch K1 is open, the first water pump 501, the second water pump 502, the third water pump, and the fourth water pump stop working simultaneously.

[0064] In some embodiments, such as Figure 2 As shown, the first liquid inlet 101 and the first liquid return outlet 102 are respectively located on both sides of the housing 120; the second liquid inlet 201 and the second liquid return outlet 202 are respectively located on both sides of the first liquid storage tank 200; and the third liquid inlet 301 and the third liquid return outlet 302 are respectively located on both sides of the second liquid storage tank 300.

[0065] In this embodiment, the first liquid inlet 101 and the first liquid return outlet 102 are respectively located on both sides of the housing 120, the second liquid inlet 201 and the second liquid return outlet 202 are respectively located on both sides of the first liquid storage tank 200, and the third liquid inlet 301 and the third liquid return outlet 302 are respectively located on both sides of the second liquid storage tank 300. This can further improve the heat dissipation efficiency of the battery pack 100 and avoid the problem of poor heat dissipation of the battery pack 100.

[0066] In some embodiments, such as Figure 2 As shown, the first inlet 101 is close to the top of the coolant reservoir 103, and the first return port 102 is close to the bottom of the coolant reservoir 103; the second inlet 201 is close to the top of the first coolant reservoir 203, and the second return port 202 is close to the bottom of the first coolant reservoir 203; the third inlet 301 is close to the top of the second coolant reservoir 303, and the third return port 302 is close to the bottom of the second coolant reservoir 303.

[0067] Specifically, when the coolant flows out from the fourth return port 402 of the heat exchanger 400, it can flow into the interior of the first liquid storage tank 200 through the second inlet 201 located near the top of the first liquid storage tank 200. The coolant inside the first liquid storage tank 200 can flow out from the second return port 202 located near the bottom of the first liquid storage tank 200 and flow into the interior of the battery pack 100 through the first inlet 101 located near the top of the battery pack 100. The coolant inside the battery pack 100 can flow out from the first return port 102 located near the bottom of the battery pack 100 and flow into the interior of the second liquid storage tank 300 through the third inlet 301 located near the top of the second liquid storage tank 300. The coolant inside the second liquid storage tank 300 can flow out from the third return port 302 located near the bottom of the second liquid storage tank 300 and flow into the interior of the heat exchanger 400 through the fourth inlet 401 of the heat exchanger 400 for heat exchange.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack immersion cooling system, characterized in that, include: A battery pack includes at least one battery cell and a housing. The housing is provided with a first liquid inlet, a first liquid outlet, and a coolant accommodating cavity. The coolant accommodating cavity is respectively connected to the first liquid inlet and the first liquid outlet. The first liquid storage tank is provided with a second liquid inlet, a second liquid return outlet and a first liquid containing cavity. The first liquid inlet is connected to the second liquid return outlet, and the first liquid containing cavity is connected to the second liquid inlet and the second liquid return outlet respectively. The second liquid storage tank is provided with a third liquid inlet, a third liquid return outlet and a second liquid containing cavity. The third liquid inlet is connected to the first liquid return outlet and the third liquid return outlet is connected to the second liquid inlet. The second liquid containing cavity is connected to the second liquid inlet and the second liquid return outlet respectively. The coolant accommodating cavity is filled with coolant, and the battery cell is disposed in the coolant accommodating cavity and submerged in the coolant.

2. The battery pack immersion cooling system according to claim 1, characterized in that, The system also includes: a heat exchanger; The heat exchanger is provided with a fourth liquid inlet and a fourth liquid return port. The fourth liquid inlet is connected to the third liquid return port, and the fourth liquid return port is connected to the second liquid inlet.

3. The battery pack immersion cooling system according to claim 2, characterized in that, The system also includes: a return water pump; The return water pump is configured to transport the coolant in the second liquid containment chamber to the first liquid containment chamber via the heat exchanger.

4. The battery pack immersion cooling system according to claim 3, characterized in that, The return water pump includes: a first water pump and a second water pump; Wherein, one end of the first water pump is connected to the second inlet, and the other end of the first water pump is connected to the fourth return port; one end of the second water pump is connected to the third return port, and the other end of the second water pump is connected to the fourth inlet.

5. The battery pack immersion cooling system according to claim 4, characterized in that, The system also includes: a switching circuit; The switching circuit is electrically connected to the first water pump and the second water pump respectively; the switching circuit is configured to control the start and stop of the first water pump and the second water pump.

6. The battery pack immersion cooling system according to claim 5, characterized in that, The switching circuit includes: a linkage switch; The linkage switch is electrically connected to the first water pump and the second water pump respectively; the linkage switch is configured such that when the linkage switch is closed, the first water pump and the second water pump start simultaneously; when the linkage switch is open, the first water pump and the second water pump stop working simultaneously.

7. The battery pack immersion cooling system according to claim 4, characterized in that, The return water pump also includes: a third water pump and a fourth water pump; Wherein, one end of the third water pump is connected to the first liquid inlet, and the other end of the third water pump is connected to the second liquid return port; one end of the fourth water pump is connected to the first liquid return port, and the other end of the fourth water pump is connected to the third liquid inlet.

8. The battery pack immersion cooling system according to claim 7, characterized in that, The first water pump, the second water pump, the third water pump, and the fourth water pump are configured to start and stop simultaneously.

9. The battery pack immersion cooling system according to any one of claims 1-8, characterized in that, The first liquid inlet and the first liquid return outlet are respectively located on both sides of the housing; or / and, The second liquid inlet and the second liquid return outlet are respectively located on both sides of the first liquid storage tank; or / and, The third liquid inlet and the third liquid return outlet are respectively located on both sides of the second liquid storage tank.

10. The battery pack immersion cooling system according to any one of claims 1-8, characterized in that, The first inlet is located near the top of the coolant reservoir, and the first outlet is located near the bottom of the coolant reservoir; or / and, The second inlet is located near the top of the first liquid receiving cavity, and the second outlet is located near the bottom of the first liquid receiving cavity; or / and, The third inlet is located near the top of the second liquid container, and the third outlet is located near the bottom of the second liquid container.

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