Immersion cooling system for battery pack

Abstract

An immersion cooling system for a battery pack, the immersion cooling system comprising a battery pack (100), a first liquid storage tank (200) and a second liquid storage tank (300). The battery pack (100) comprises at least one battery cell (110) and a case (120), wherein the case (120) is provided with a first liquid inlet (101), a first liquid return port (102) and a coolant accommodating cavity (103) for submerging the battery cell (110); the first liquid storage tank (200) is provided with a second liquid inlet (201), a second liquid return port (202) and a first liquid accommodating cavity (203); and the second liquid storage tank (300) is provided with a third liquid inlet (301), a third liquid return port (302) and a second liquid accommodating cavity (303). The first liquid inlet (101) is in communication with the second liquid return port (202), the third liquid inlet (301) is in communication with the first liquid return port (102), and the third liquid return port (302) is in communication with the second liquid inlet (201); thus, during the circulating flow of a coolant, the pressure of the coolant flowing in the battery pack (100) can be reduced by means of the first liquid storage tank (200) at the first liquid inlet (101) and the second liquid storage tank (300) at the first liquid return port (102), thereby reducing the risk of liquid leakage of the battery pack (100) and improving the safety and reliability of the battery pack (100).

Description

Battery pack immersion cooling system

[0001] This application claims priority to Chinese Patent Application No. 202422486050.7, filed on October 14, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of immersion liquid cooling technology, specifically to a battery pack immersion cooling system. Background Technology

[0003] Immersion battery cooling technology is a cooling technology that uses coolant to directly immerse battery cells, aiming to improve the thermal management efficiency and safety of batteries. The basic principle of immersion battery cooling technology 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 each cell in the battery pack. Invention Overview

[0004] However, immersion cooling technology places high demands on the sealing of battery modules; failure to meet these requirements can easily lead to leakage and corrosion.

[0005] This application provides a battery pack immersion cooling system, including:

[0006] 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.

[0007] 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.

[0008] 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.

[0009] The coolant containment chamber is filled with coolant, and the battery cell is located inside the coolant containment chamber and submerged in the coolant. Beneficial effects

[0010] The battery pack immersion cooling system provided in this application includes a battery pack with cells and a casing, a first liquid storage tank with a second liquid inlet, a second liquid outlet and a first liquid containment chamber, and a second liquid storage tank with a third liquid inlet, a third liquid outlet and a second liquid containment chamber. The casing has a first liquid inlet, a first liquid outlet and a coolant containment chamber for immersing the cells. The first liquid inlet is connected to the second liquid outlet; the third liquid inlet is connected to the first liquid outlet, and the third liquid outlet is connected to the second liquid inlet. 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 battery pack leakage and improving the safety and reliability of the battery pack. Attached Figure Description

[0011] Figure 1 is a first schematic block diagram of the battery pack immersion cooling system provided in this application;

[0012] Figure 2 is a second schematic block diagram of the battery pack immersion cooling system provided in this application;

[0013] Figure 3 is a third schematic block diagram of the battery pack immersion cooling system provided in this application.

[0014] Explanation of reference numerals in the attached figures:

[0015] 100. Battery pack; 110. Battery cell; 120. Housing; 101. First liquid inlet; 102. First liquid return outlet; 103. Coolant accommodating chamber;

[0016] 200. First liquid storage tank; 201. Second liquid inlet; 202. Second liquid return outlet; 203. First liquid receiving chamber;

[0017] 300. Second liquid storage tank; 301. Third liquid inlet; 302. Third liquid return outlet; 303. Second liquid receiving chamber;

[0018] 400. Heat exchanger; 401. Fourth liquid inlet; 402. Fourth liquid return port;

[0019] 500, Return water pump; 501, First water pump; 502, Second water pump; 503, Third water pump; 504, Fourth water pump;

[0020] 600. Liquid cooling pipes;

[0021] 700. Switching circuit. Embodiments of the present invention

[0022] Please refer to Figure 1, which is a first schematic block diagram of the battery pack immersion cooling system provided in this application. As shown in Figure 1, this application provides a battery pack immersion cooling system, including:

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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, thereby greatly reducing the flow pressure of the coolant in the coolant accommodating cavity 103, thus reducing the risk of leakage of the battery pack 100 and improving the safety and reliability of the battery pack 100.

[0029] 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, respectively, 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 203. 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. 03 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 improving the safety and reliability of the battery pack 100.

[0030] In some embodiments, as shown in FIG1, the battery pack immersion cooling system further includes a heat exchanger 400; 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.

[0031] Specifically, heat exchanger 400 is a device that transfers part of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. The function of heat exchanger 400 is to bring the fluid temperature to the required process temperature through heat transfer, and it is used in various industrial fields such as chemical, petroleum, power, and food processing.

[0032] 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.

[0033] 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.

[0034] In some embodiments, as shown in FIG1, the battery pack immersion cooling system further includes a return water pump 500; wherein the return water pump 500 is configured to deliver coolant in the second liquid containment chamber 303 to the first liquid containment chamber 203 via the heat exchanger 400.

[0035] 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.

[0036] In some embodiments, as shown in FIG1, the return water pump 500 includes: a first water pump 501 and a second water pump 502; 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.

[0037] 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 improving the safety and reliability of the battery pack 100.

[0038] 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.

[0039] In some embodiments, as shown in FIG2, the battery pack immersion cooling system further 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.

[0040] 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.

[0041] In some embodiments, as shown in FIG2, the switch circuit 700 includes: a linkage switch K1; 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.

[0042] 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 improving the reliability of the battery pack immersion cooling system.

[0043] 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.

[0044] In some embodiments, as shown in FIG3, the return water pump 500 further includes: a third water pump 503 and a fourth water pump 504; wherein, one end of the third water pump 503 is connected to the first inlet 101, and the other end of the third water pump 503 is connected to the second return water port 202; one end of the fourth water pump 504 is connected to the first return water port 102, and the other end of the fourth water pump 504 is connected to the third inlet 301.

[0045] In this embodiment, a third water pump 503 can be installed between the first liquid inlet 101 and the second liquid return port 202, and a fourth water pump 504 can be installed between the first liquid return port 102 and the third liquid inlet 301. This further reduces the pressure of the coolant flowing within the battery pack 100 and allows for precise control of the heat exchange efficiency of the battery pack 100. Furthermore, the start and stop of the third water pump 503 and the fourth water pump 504 can be controlled by the switching circuit 700.

[0046] In some embodiments, the first water pump 501, the second water pump 502, the third water pump 503, and the fourth water pump 504 are configured to start and stop simultaneously.

[0047] In this embodiment, the first water pump 501, the second water pump 502, the third water pump 503, and the fourth water pump 504 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 503, and the fourth water pump 504 can start simultaneously; when the linkage switch K1 is open, the first water pump 501, the second water pump 502, the third water pump 503, and the fourth water pump 504 stop working simultaneously.

[0048] In some embodiments, as shown in FIG2, the first liquid inlet 101 and the first liquid return outlet 102 are respectively disposed on both sides of the housing 120; the second liquid inlet 201 and the second liquid return outlet 202 are respectively disposed 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 disposed on both sides of the second liquid storage tank 300.

[0049] 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 improve the heat dissipation efficiency of the battery pack 100 and avoid the problem of poor heat dissipation of the battery pack 100.

[0050] In some embodiments, as shown in FIG2, the first liquid inlet 101 is close to the top of the coolant reservoir 103, and the first liquid return port 102 is close to the bottom of the coolant reservoir 103; the second liquid inlet 201 is close to the top of the first liquid reservoir 203, and the second liquid return port 202 is close to the bottom of the first liquid reservoir 203; the third liquid inlet 301 is close to the top of the second liquid reservoir 303, and the third liquid return port 302 is close to the bottom of the second liquid reservoir 303.

[0051] 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.

Claims

1. A battery pack immersion cooling system, comprising: 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 return 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 return outlet (102) respectively. The first liquid storage tank (200) is provided with a second liquid inlet (201), a second liquid return port (202) and a first liquid receiving cavity (203). The first liquid inlet (101) is connected to the second liquid return port (202), and the first liquid receiving cavity (203) is connected to the second liquid inlet (201) and the second liquid return port (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. 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.

2. The battery pack immersion cooling system according to claim 1 further includes a heat exchanger (400). 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).

3. The battery pack immersion cooling system according to any one of claims 1-2 further includes a return water pump (500). wherein The return water pump (500) is configured to deliver coolant from the second liquid containment chamber (303) to the first liquid containment chamber (203) via the heat exchanger (400).

4. The battery pack immersion cooling system of any one of claims 1-3, wherein, The return water pump (500) includes a first water pump (501) and a second water pump (502); One end of the first water pump (501) is connected to the second liquid inlet (201), and the other end of the first water pump (501) is connected to the fourth liquid return port (402); one end of the second water pump (502) is connected to the third liquid return port (302), and the other end of the second water pump (502) is connected to the fourth liquid inlet (401).

5. The battery pack immersion cooling system according to any one of claims 1-4, further comprising 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).

6. The battery pack immersion cooling system of any one of claims 1-5, wherein, The switching circuit (700) includes a linkage switch (K1); 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.

7. The battery pack immersion cooling system of any one of claims 1-4, wherein, The return water pump (500) also includes a third water pump (503) and a fourth water pump (504). One end of the third water pump (503) is connected to the first liquid inlet (101), and the other end of the third water pump (503) is connected to the second liquid return port (202); one end of the fourth water pump (504) is connected to the first liquid return port (102), and the other end of the fourth water pump (504) is connected to the third liquid inlet (301).

8. The battery pack immersion cooling system of any one of claims 1-7, wherein, The first water pump (501), the second water pump (502), the third water pump (503) and the fourth water pump (504) are configured to start and stop simultaneously.

9. The battery pack immersion cooling system according to any one of claims 1-8, wherein, The first liquid inlet (101) and the first liquid return outlet (102) are respectively located on both sides of the housing (120); or / and, 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); or / 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).

10. The battery pack immersion cooling system according to any one of claims 1-8, wherein, The first inlet (101) is located near the top of the coolant reservoir (103), and the first outlet (102) is located near the bottom of the coolant reservoir (103); or / and, The second inlet (201) is located near the top of the first liquid receiving cavity (203), and the second outlet (202) is located near the bottom of the first liquid receiving cavity (203); or / and, The third liquid inlet (301) is located near the top of the second liquid container (303), and the third liquid return port (302) is located near the bottom of the second liquid container (303).

Images