Battery thermal management system and control method for enhancing heat dissipation of battery tabs

Abstract

The application discloses a battery thermal management system and a control method for enhancing heat dissipation of battery tabs, and belongs to the technical field of battery heat dissipation. The system comprises a liquid cooling module and a tab cooling module. The tab cooling module comprises a flexible bag, a water supply branch pipe, a water return branch pipe and a temperature sensor. The flexible bag is arranged above battery group tabs, a plurality of aluminum balls filled with phase change materials are arranged in the flexible bag, water inlets and outlets of the flexible bag are communicated with the water supply branch pipe and the water return branch pipe respectively, and the water supply branch pipe and the water return branch pipe are communicated with a water supply main pipe and a water return main pipe respectively. The temperature sensor is used for monitoring the temperature of the aluminum balls. The system comprehensively considers the heat dissipation problems of the battery tabs and the bottom of the battery, couples PCM cooling and liquid cooling to dissipate heat of the battery group module, and further optimizes the coupling mode. The liquid cooling module is started only when the temperature of the aluminum balls exceeds 40 DEG C. The design can reduce the flow time of the liquid medium, effectively reduces the risk of liquid leakage and electric leakage, and improves the safety and stability of the system.

Description

Technical Field

[0001] This invention belongs to the field of battery heat dissipation technology, specifically relating to a battery thermal management system and control method for enhancing heat dissipation from battery tabs. Background Technology

[0002] During battery operation, if cooling is based solely on natural convection, problems such as poor temperature uniformity and ineffective cooling at high discharge rates will occur. This results in a significant high-temperature zone near the battery tabs, where the temperature is considerably higher than the battery casing. This internal temperature inconsistency can lead to uneven discharge current in parallel branches, potentially causing over-discharge of some individual cells. In severe cases, it can even accelerate the degradation of some individual cells, ultimately leading to premature battery failure. Therefore, excessively high tab temperatures significantly impact battery life and efficiency. Controlling battery temperature uniformity is crucial for improving battery safety and cycle life. However, targeted research on common battery thermal management systems reveals that most do not adequately address heat dissipation at the tabs. Therefore, improving the heat dissipation performance of the battery tabs is a primary issue that needs to be addressed.

[0003] To address the issue of localized heat dissipation in batteries, the commonly used cooling methods are liquid cooling and phase change material (PCM) cooling. While liquid cooling offers good heat conduction and can efficiently and effectively cool the tabs by adjusting the flow rate of the liquid cooling medium, the complex wiring at the battery tabs and the high risk of leakage during use make liquid cooling media problematic. Furthermore, the conductivity of liquid cooling media poses a risk of electrical leakage in battery thermal management systems, significantly reducing their reliability and safety. PCM cooling, on the other hand, is widely used in battery thermal management due to its suitable phase change temperature, lack of overcooling, non-toxicity, low cost, and high stability. Filling the battery with PCM significantly reduces the temperature at the battery tabs, thus minimizing localized temperature differences within the battery pack. Compared to liquid cooling, PCM cooling eliminates concerns about leakage and electrical leakage, significantly improving safety. However, because the latent heat absorbed by the PCM phase change is difficult to dissipate, this cooling method typically cannot support continuous cooling over extended periods.

[0004] To effectively address the heat dissipation failure problem caused by the low thermal conductivity of PCM (Polymer Capacitor), those skilled in the art have attempted to compensate for the shortcomings of each method by coupling phase change materials (PCMs) and liquid cooling technology. This combined heat dissipation approach achieves complementary advantages among multiple management modes, ultimately resulting in effective temperature control at the battery tabs. For example, Chinese Patent CN 111403847 A discloses a power battery tab heat dissipation system based on the coupling of a phase change material and a U-shaped flat heat pipe. This system fills the front and rear filling slots of the isolation frame above the battery module with PCM, and utilizes the U-shaped flat heat pipe to promptly remove the heat accumulated in the PCM module after continuous charge and discharge cycles. Furthermore, it enhances horizontal heat diffusion by placing a graphene film between the U-shaped flat heat pipe and the top surface of the PCM-filled area. The above-mentioned heat dissipation system theoretically achieves the goal of enhancing heat dissipation at the battery tabs. However, it still has several obvious shortcomings: First, although the system achieves the complementary advantages of multiple thermal management methods, it fails to effectively avoid or weaken the shortcomings of the liquid cooling mode itself. During system operation, liquid cooling medium is always flowing in the U-shaped flat heat pipe, and there is still a high risk of leakage and electric shock. Second, the phase change material is directly filled in the filling grooves before and after the isolation frame, presenting a regular plate-frame structure. It is in a flat contact state with the battery tabs. However, the battery tabs have an uneven shape, so the flat phase change material is difficult to make good contact with the battery tabs, resulting in a small heat exchange contact area between the two. The heat dissipation intensity at the tabs needs to be improved.

[0005] To address the aforementioned issues, it is necessary to further improve and optimize the battery thermal management system. Based on the coupling of different cooling methods, it is necessary to give fuller consideration to the design and safety issues of different cooling methods. It is not only necessary to maximize the cooling effect of PCM, but also to minimize the safety issues inherent in the liquid phase cooling mode itself. While improving the safety of battery module use, it is also necessary to maintain the temperature at the battery tabs within a suitable temperature range. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and provide a battery thermal management system and control method to enhance the heat dissipation of battery tabs. It can efficiently dissipate heat from the battery tabs while meeting the heat dissipation requirements of the bottom of the battery pack module, and at the same time reduce the safety problems inherent in the liquid phase cooling mode itself.

[0007] The present invention is implemented as follows: a battery thermal management system for enhancing heat dissipation of battery tabs includes a liquid cooling module and a tab cooling module respectively located at the bottom and top of the battery pack module; the liquid cooling module includes a liquid cooling heat exchanger, a main water supply pipe and a main water return pipe, the water supply port of the liquid cooling heat exchanger being connected to the main water supply pipe and the water return port being connected to the main water return pipe; the tab cooling module includes a flexible bag, a water supply branch pipe, a water return branch pipe and a temperature sensor; the flexible bag is located above the battery pack tabs, and several hollow aluminum balls are arranged inside the flexible bag, the aluminum balls being filled with phase change material, the water inlet on the flexible bag being connected to the water supply branch pipe and the water outlet being connected to the water return branch pipe, the other end of the water supply branch pipe being connected to the main water supply pipe, and the other end of the water return branch pipe being connected to the main water return pipe; the temperature sensor is located inside the flexible bag and is in contact with some of the aluminum balls inside it.

[0008] Furthermore, the system also includes a control cabinet, which is connected to the electrical components in the system for end-point control.

[0009] Furthermore, in the horizontal direction, the height of the inlet of the flexible bag is higher than the height of the outlet.

[0010] Furthermore, the heat exchange tubes inside the liquid-cooled heat exchanger housing are arranged in an "S" shape.

[0011] Furthermore, the flexible bag is made of thermally conductive and insulating material, with an insulating steel plate on top. The top surface of the flexible bag is fixed to the bottom surface of the insulating steel plate, which is then fixed by support columns.

[0012] Furthermore, a drain outlet is provided at each of the four corners of the bottom of the flexible bag, and a longitudinally arranged drain branch pipe is sealed and connected to each drain outlet. The bottom of the drain branch pipe is connected to the drain pipe, and the outlet end of the drain pipe is connected to the return water main pipe. A hollow vent column that communicates with the outside is provided on the flexible bag, and the other end of the hollow vent column is connected to the inside of the flexible bag. A pressure relief valve is provided on the hollow vent column.

[0013] Furthermore, a water supply power pump is installed on the main water supply pipe, a return water power pump is installed on the main return water pipe, a water supply valve and a water supply pump are installed on the water supply branch pipe, and a return water pump is installed on the return water branch pipe. The water supply power pump, the return water power pump, the water supply valve, the water supply pump and the return water pump are electrically connected to the control cabinet, and the control cabinet adjusts the flow rate of the pump and the opening degree of the water supply valve.

[0014] Furthermore, a drain valve is installed at the end of the drain pipe, and both the pressure relief valve and the drain valve are electrically connected to the control cabinet.

[0015] Furthermore, the temperature sensor is electrically connected to the control cabinet, which receives the temperature data of the aluminum ball from the temperature sensor in real time, and automatically adjusts the flow rate of the water pump and the opening degree of the water supply valve accordingly.

[0016] The control method for the battery thermal management system that enhances heat dissipation from the battery tabs is as follows:

[0017] When the battery module is working normally and the temperature sensor detects that the temperature of the aluminum ball is below 40°C, the water supply pump and the return pump are started. The liquid cooling medium is pumped into the liquid-cooled heat exchanger through the water supply main pipe and then flows out through the return main pipe. At this time, the water supply valve, water supply pump and return pump are all closed and there is no liquid cooling medium flowing in the flexible bag.

[0018] When the battery module is working normally and the temperature sensor detects that the temperature of the aluminum ball exceeds 40°C, the liquid phase cooling medium flows into the liquid-cooled heat exchanger through the main water supply pipe and then flows out through the main water return pipe. At the same time, the water supply valve, water supply pump and water return pump are opened. The liquid phase cooling medium flows into the water supply branch pipe and enters the flexible bag under the action of the water supply pump. Then, under the action of the water return pump, it enters the main water return pipe through the water return branch pipe. During the flow of the liquid phase cooling medium in the flexible bag, the heat of the aluminum ball filled with phase change material is absorbed and carried away by the flowing liquid phase cooling medium.

[0019] When cooling is complete, i.e. when the temperature sensor detects that the temperature of the aluminum ball has dropped below 20°C, close the water supply valve, water supply pump and return water pump, and open the pressure relief valve and drain valve. Most of the liquid phase cooling medium remaining in the flexible bag is discharged into the return water main through the drain pipe. After three minutes, both the drain valve and the pressure relief valve are closed.

[0020] When the battery pack module stops working, the liquid cooling module and the tab cooling module stop working, and the aluminum balls enter a natural cooling state.

[0021] Beneficial effects:

[0022] 1. The battery thermal management system for enhancing heat dissipation of battery tabs disclosed in this application can perform targeted enhanced cooling at the battery tabs while meeting the heat dissipation requirements at the bottom of the battery pack, which helps to maintain the temperature uniformity of the battery pack and improve the working efficiency of the battery.

[0023] 2. This application not only couples liquid cooling and PCM cooling to solve the problem of heat dissipation of battery tabs, but also optimizes the coupling operation. When the temperature of the battery tabs does not exceed the reasonable temperature range, the cooling operation mainly relies on the PCM material to absorb the heat of the battery tabs. The liquid cooling mode is only activated when the temperature of the aluminum ball is detected to be higher than 40°C to cool down in conjunction with the PCM material. The advantage of this design is that it can not only meet the heat dissipation requirements of the battery tabs under different temperature conditions, but also reduce the risk of leakage and leakage to a certain extent by reducing the use time of the liquid medium. In addition, reducing the use of the liquid medium can also save energy and adapt to my country's strategic national conditions.

[0024] 3. This application uses a flexible bag as the material that comes into direct contact with the battery tab. The several aluminum balls encapsulating PCM material inside the bag will flexibly fit against the uneven battery tab position under the effect of their own weight and mutual compression. This allows the aluminum balls encapsulating PCM material inside the bag to also cover and surround the tab, thereby increasing the contact area between the phase change material and the battery tab, enhancing the heat exchange effect, and facilitating the timely removal of the heat accumulated at the tab after continuous charge and discharge cycles of the battery module.

[0025] 4. The temperature sensor installed in this application can monitor the temperature of the PCM aluminum ball in real time, and then the control cabinet can adjust the opening of the water supply valve and the flow rate of the water supply pump according to the temperature information to ensure that the temperature at the battery tab is always within a suitable temperature range. Attached Figure Description

[0026] Figure 1 A schematic diagram of the battery thermal management system for enhancing heat dissipation from the battery tabs;

[0027] Figure 2 This is a schematic diagram of the internal structure of a flexible bag;

[0028] Among them, 1-liquid cooling module, 2-tab cooling module, 3-control cabinet, 4-battery pack module;

[0029] 11-Liquid-cooled heat exchanger; 12-Water supply main pipe; 13-Water return main pipe;

[0030] 111-Heat exchange tube, 112-Water supply port, 113-Water return port;

[0031] 121 - Water supply power pump;

[0032] 131 - Return water power pump;

[0033] 21-Flexible bag, 22-Water supply branch pipe, 23-Return water branch pipe, 24-Temperature sensor, 25-Aluminum ball, 26-Insulating steel plate, 27-Drainage branch pipe, 28-Drainage pipe, 29-Hollow exhaust column;

[0034] 211 - Inlet, 212 - Outlet, 213 - Drain

[0035] 221 - Water supply valve; 222 - Water supply pump;

[0036] 231 - Return water pump;

[0037] 261-Support column;

[0038] 281-Drain valve. Detailed Implementation

[0039] The preferred embodiments of the present invention will now be described in detail so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0040] Example 1: Battery thermal management system to enhance heat dissipation from battery tabs

[0041] In order to enhance heat dissipation at the battery tabs while meeting the heat dissipation requirements at the bottom of the battery pack module, thereby effectively improving the temperature consistency inside the battery box, ensuring battery efficiency and lifespan, and further improving the safety of battery use, this embodiment provides a battery thermal management system that enhances heat dissipation at the battery tabs.

[0042] The system includes a liquid cooling module 1, a tab cooling module 2, and a control cabinet 3. The liquid cooling module 1 and the tab cooling module 2 are respectively located at the bottom and top of the battery pack module 4. The control cabinet 3 is electrically connected to the electronic components used in the system to perform end control of each component during system operation, thereby improving the automation level and operation accuracy of the system.

[0043] The liquid cooling module 1 includes a liquid cooling heat exchanger 11, a water supply main pipe 12, and a water return main pipe 13. The heat exchange tubes 111 inside the liquid cooling heat exchanger 11 are arranged in an "S" shape to increase the heat exchange area and enhance the heat exchange effect at the bottom of the battery. The water supply port 112 on one side of the liquid cooling heat exchanger 11 is connected to the water supply main pipe 12, and the water return port 113 on the opposite side is connected to the water return main pipe 13. A water supply power pump 121 is provided on the water supply main pipe 12, and a water return power pump 131 is provided on the water return main pipe 13. The water supply power pump 121 and the water return power pump 131 are electrically connected to the control cabinet 3 for flow rate adjustment.

[0044] The tab cooling module 2 includes a flexible bag 21, a water supply branch pipe 22, a water return branch pipe 23, and a temperature sensor 24. The flexible bag 21 is located above the battery tab and is made of an insulating material with good thermal conductivity (such as thermally conductive silicone cloth). Several aluminum balls 25 are placed inside the flexible bag 21. The aluminum balls 25 have a hollow structure and are filled with PCM material. After a large number of aluminum balls 25 filled with PCM are put into the flexible bag 21, the bottom surface of the flexible bag 21 will fit more tightly around the uneven tab due to the weight of the aluminum balls 25 and the squeezing effect between the aluminum balls 25. This increases the contact area between the phase change material and the battery tab, which can enhance the heat dissipation of the tab.

[0045] The inlet 211 on one side of the flexible bag 21 is connected to the water supply branch pipe 22, and the outlet 212 on the opposite side is connected to the return water branch pipe 23. The other end of the water supply branch pipe 22 is connected to the water supply main pipe 12, and the other end of the return water branch pipe 23 is connected to the return water main pipe 13.

[0046] To regulate the flow of media and the inlet water flow in the branch pipes, a water supply valve 221 and a water supply pump 222 are installed on the water supply branch pipe 22, and a return water pump 231 is installed on the return water branch pipe 23. The water supply valve 221, water supply pump 222, and return water pump 231 are electrically connected to the control cabinet 3. The control cabinet 3 adjusts the pump flow rate and the opening of the water supply valve 221 to ensure that the temperature at the battery terminals remains within a suitable range.

[0047] To prevent the return water pump 231 from running dry, the height of the inlet 211 of the flexible bag 21 is higher than the height of the outlet 212 in the horizontal direction.

[0048] Temperature sensor 24 is located in the middle of the flexible bag 21 and is in contact with part of the aluminum ball 25 inside it. Temperature sensor 24 is electrically connected to control cabinet 3. Control cabinet 3 receives the temperature of hollow aluminum ball 25 fed back by temperature sensor 24 in real time, and automatically adjusts the flow rate of water pump 222 and the opening degree of water supply valve 221 accordingly.

[0049] In order to provide better positioning support for the flexible bag 21 in the spatial dimension, an insulating steel plate 26 is provided on the top of the flexible bag 21. The top surface of the flexible bag 21 is fixed on the bottom surface of the insulating steel plate 26, and the insulating steel plate 26 is fixed in the battery box body by the support column 261.

[0050] When liquid cooling is used to cool the tabs under specific conditions, the return water branch pipe 23 is mainly used to discharge the liquid cooling medium in the flowing state. After the water supply from the branch pipe is stopped, a large amount of liquid cooling medium often remains in the flexible bag 21. This not only increases the burden on the flexible bag 21, but also increases the risk of leakage. Therefore, corresponding measures need to be taken to discharge as much of the liquid cooling medium remaining in the flexible bag 21 as possible. To this end, in this embodiment, a drain outlet 213 is provided at each of the four corners of the bottom of the flexible bag 21. Each drain outlet 213 is connected to a longitudinally arranged drain branch pipe 27 through parts such as collars and clamps. The bottom of the drain branch pipe 27 is connected to the drain pipe 28, and the outlet end of the drain pipe 28 is connected to the return water main pipe 13. A hollow exhaust column 29 is provided on the flexible bag 21 and is connected to its interior. In this embodiment, one end of the hollow exhaust column 29 is connected to the interior of the flexible bag, and the other end extends to the outside of the heat insulation steel plate 26. A pressure relief valve is provided on the hollow exhaust column 29.

[0051] Considering that the application scenario of this system is inside the battery box, in order to further reduce the risk of leakage and conductivity at the joint of the drain branch pipe 27 and the drain pipe 28, it is preferable that the drain branch pipe 27 and the drain pipe 28 are integrally injection molded.

[0052] In order to better control the auxiliary drainage process electrically, a drainage valve 281 is provided at the end of the drainage pipe 28. Both the pressure relief valve and the drainage valve 281 are electrically connected to the control cabinet 3, and the control cabinet 3 controls the opening and closing of the pressure relief valve and the drainage valve 281.

[0053] To achieve ideal thermal conductivity using phase change materials, the aluminum spheres 25 encapsulating the PCM material should be tightly fitted around the tabs in a wrapping manner to increase the contact area. Therefore, the size of the aluminum spheres 25 should be designed to be relatively small. For example, when used for heat dissipation in battery packs composed of small cylindrical batteries, the diameter of the aluminum spheres 25 can be designed to be about 1 / 5 of the diameter of the small battery. However, for battery packs composed of battery cells of other shapes, the diameter of the aluminum spheres 25 needs to be specifically selected according to the size of the tabs. The main goal is to achieve a tight wrapping state, so the specific size data is not explicitly limited in this embodiment.

[0054] The specific operation process of this system is as follows:

[0055] When the battery module 4 is working normally and the temperature sensor 24 detects that the temperature of the aluminum ball 25 inside the flexible bag 21 is below 40°C, the water supply power pump 121 and the return water power pump 131 are started. Cooling water is pumped into the liquid-cooled heat exchanger 11 through the water supply main pipe 12 and then flows out through the return water main pipe 13. At this time, the water supply valve 221, the water supply pump 222 and the return water pump 231 are all closed, and there is no cooling water flowing inside the flexible bag 21.

[0056] When the battery module 4 is operating normally and the temperature sensor 24 detects that the temperature of the aluminum balls 25 inside the flexible bag 21 exceeds 40°C, cooling water flows into the liquid-cooled heat exchanger 11 through the main water supply pipe 12, and then flows out through the main water return pipe 13. At the same time, the water supply valve 221, the water supply pump 222, and the water return pump 231 are opened. Cooling water flows into the water supply branch pipe 22 under the action of the water supply pump 222 and enters the flexible bag 21. Then, under the action of the water return pump 231, it enters the main water return pipe 13 through the water return branch pipe 23 to realize the circulation of the medium. During the flow of cooling water within the flexible bag 21, the heat of the aluminum balls 25 filled with PCM is absorbed and carried away by the flowing cooling water. When cooling is complete, i.e., when the temperature sensor 24 detects that the temperature of the aluminum balls 25 inside the flexible bag 21 has dropped below 20°C, the water supply valve 221, water supply pump 222, and return water pump 231 are closed, and the pressure relief valve and drain valve 281 are opened. Most of the remaining cooling water in the flexible bag 21 can be discharged into the return water main pipe 13 through the drain pipe 28. After three minutes, both the drain valve 281 and the pressure relief valve are closed.

[0057] When the battery pack module 4 stops working, the liquid cooling module 1 and the tab cooling module 2 stop working, and the aluminum ball 25 inside the flexible bag enters a natural cooling state.

[0058] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A battery thermal management system for enhancing heat dissipation from battery tabs, characterized in that, This includes liquid cooling modules and tab cooling modules located at the bottom and top of the battery pack module, respectively; The liquid cooling module includes a liquid cooling heat exchanger, a main water supply pipe, and a main water return pipe. The water supply port of the liquid cooling heat exchanger is connected to the main water supply pipe, and the water return port is connected to the main water return pipe. The electrode cooling module includes a flexible bag, a water supply branch pipe, a water return branch pipe, and a temperature sensor; A flexible bag is positioned above the battery tabs. Inside the flexible bag are several hollow aluminum spheres filled with phase change material. The inlet of the flexible bag is connected to the water supply branch pipe, and the outlet is connected to the return branch pipe. The other end of the water supply branch pipe is connected to the main water supply pipe, and the other end of the return branch pipe is connected to the main return pipe. As the material that comes into direct contact with the battery tabs, the flexible bag, under its own weight and the effect of mutual compression, allows the aluminum spheres encapsulating phase change material inside to flexibly conform to the uneven battery tab position, thus enabling the aluminum spheres encapsulating phase change material inside to also cover and surround the tab. The temperature sensor is located inside the flexible bag and is in contact with some of the aluminum balls inside it; The specific operation process of this battery thermal management system is as follows: When the battery module is working normally and the temperature sensor detects that the temperature of the aluminum ball is below 40°C, the water supply pump and the return pump are started. The liquid cooling medium is pumped into the liquid-cooled heat exchanger through the water supply main pipe and then flows out through the return main pipe. At this time, the water supply valve, water supply pump and return pump are all closed and there is no liquid cooling medium flowing in the flexible bag. When the battery module is working normally and the temperature sensor detects that the temperature of the aluminum ball exceeds 40°C, the liquid phase cooling medium flows into the liquid-cooled heat exchanger through the main water supply pipe and then flows out through the main water return pipe. At the same time, the water supply valve, water supply pump and water return pump are opened. The liquid phase cooling medium flows into the water supply branch pipe and enters the flexible bag under the action of the water supply pump. Then, under the action of the water return pump, it enters the main water return pipe through the water return branch pipe. During the flow of the liquid phase cooling medium in the flexible bag, the heat of the aluminum ball filled with phase change material is absorbed and carried away by the flowing liquid phase cooling medium. When cooling is complete, i.e. when the temperature sensor detects that the temperature of the aluminum ball has dropped below 20°C, close the water supply valve, water supply pump and return water pump, and open the pressure relief valve and drain valve. Most of the liquid phase cooling medium remaining in the flexible bag is discharged into the return water main through the drain pipe. After three minutes, both the drain valve and the pressure relief valve are closed. When the battery pack module stops working, the liquid cooling module and the tab cooling module stop working, and the aluminum balls enter a natural cooling state.

2. The battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 1, characterized in that, The system also includes a control cabinet, which is connected to the electrical components in the system for end-point control.

3. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 1, characterized in that, In the horizontal direction, the height of the inlet of the flexible bag is higher than the height of the outlet.

4. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 1, characterized in that, The heat exchange tubes inside the liquid-cooled heat exchanger housing are arranged in an "S" shape.

5. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 1, characterized in that, The flexible bag is made of thermally conductive and insulating material. An insulating steel plate is provided on the top of the flexible bag. The top surface of the flexible bag is fixed to the bottom surface of the insulating steel plate, which is fixed by support columns.

6. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 1, characterized in that, The flexible bag has a drain outlet at each of its four bottom corners. Each drain outlet is sealed and connected to a longitudinally arranged drain branch pipe. The bottom of the drain branch pipe is connected to the drain pipe, and the outlet of the drain pipe is connected to the return water main pipe. The flexible bag has a hollow vent column that is connected to the outside. The other end of the hollow vent column is connected to the inside of the flexible bag, and a pressure relief valve is installed on the hollow vent column.

7. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 2, characterized in that, A water supply power pump is installed on the main water supply pipe, a return water power pump is installed on the main return water pipe, a water supply valve and a water supply pump are installed on the water supply branch pipe, and a return water pump is installed on the return water branch pipe. The water supply power pump, the return water power pump, the water supply valve, the water supply pump and the return water pump are electrically connected to the control cabinet, and the control cabinet adjusts the flow rate of the pump and the opening of the water supply valve.

8. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 5, characterized in that, A drain valve is installed at the end of the drain pipe. Both the pressure relief valve and the drain valve are electrically connected to the control cabinet.

9. A battery thermal management system for enhancing heat dissipation from battery tabs as described in claim 7, characterized in that, The temperature sensor is electrically connected to the control cabinet. The control cabinet receives the temperature data of the aluminum ball from the temperature sensor in real time, and automatically adjusts the flow rate of the water pump and the opening degree of the water supply valve accordingly.

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