Liquid cooling system equipped with high-low position compatible water tank

Abstract

The utility model provides a liquid cooling system equipped with a high-low position compatible water tank, which relates to the technical field of energy storage liquid cooling systems and comprises a main circulation pipeline and a water tank. An electromagnetic valve, a one-way valve and a water pump are sequentially connected to the main circulating pipeline from liquid inlet to liquid outlet; the main circulating pipeline is also connected with a pressure sensor; a liquid injection branch is connected between the one-way valve and the water pump on the main circulation pipeline; a water tank branch is connected between the electromagnetic valve and the one-way valve on the main circulating pipeline; a breather valve communicated with the water tank branch and the inner cavity of the water tank is arranged at the bottom of the water tank; the top of the water tank is communicated with the atmosphere, and cooling liquid in the water tank is injected into the main circulation pipeline or drained out of the water tank under the action of the breather valve. The utility model has the advantages that the water tank in the system is free from maintenance, free from regular gas filling, free from position limitation and very flexible in structural layout under the action of the breather valve at the bottom, and meanwhile, automatic liquid supplementing can be realized under the matching of the electromagnetic valve and the water tank.

Description

Technical Field

[0001] This utility model relates to the field of energy storage liquid cooling system technology, and more specifically, to a liquid cooling system equipped with a high-low level compatible water tank. Background Technology

[0002] Energy storage batteries generate a significant amount of heat during charging and discharging. As this heat accumulates, the battery temperature continues to rise. To prevent thermal failure or thermal runaway, a thermal management system is required to maintain the battery temperature within a suitable range. Cold plate liquid cooling is currently the most widely used thermal management solution for energy storage. A cold plate liquid cooling system consists of a liquid cooling unit, external piping, and liquid cooling plates, with the liquid cooling unit being the core unit. The coolant in the liquid cooling system expands and contracts with temperature changes. To ensure the main circulation loop of the liquid cooling system is always filled with coolant and the system pressure remains stable, a buffer voltage regulator unit must be installed in the liquid cooling unit.

[0003] Currently, there are two main types of buffer and pressure stabilizing units for energy storage liquid cooling units: one is the airbag expansion tank, which is mainly suitable for closed systems. The advantage of the airbag expansion tank is its flexible layout, which is not limited by the placement location. It can be placed at the high or low position of the system. However, the disadvantage is that it is necessary to add gas to the expansion tank regularly, and the amount of gas added is difficult to control. This is because the amount of gas added varies depending on the ambient temperature and the liquid cooling system conditions. If the gas adding cycle or the amount of gas added is not appropriate, it is very easy to cause the expansion tank to fail. Therefore, the operation and maintenance are difficult and costly, which has become a pain point in the industry.

[0004] Secondly, there are elevated water tanks or expansion tanks, mainly suitable for open or semi-open systems. The advantage of elevated water tanks or expansion tanks is that they are connected to the atmosphere, enabling automatic pressure regulation and compensation without the need for regular gas replenishment and maintenance. However, the disadvantage is that they must be placed at a high position in the system. Since existing water tanks typically have their breather valves or waterproof vent valves installed at the top, the gas pressure inside the tank is easily affected by ambient temperature. When the gas pressure inside the tank drops to atmospheric pressure, liquid in the liquid cooling system that is higher than the tank will flow towards the tank, resulting in the main circulation loop of the liquid cooling system not being fully filled with liquid. This affects cooling efficiency and system reliability, and imposes many limitations on the structural layout of the liquid cooling unit.

[0005] Furthermore, as the liquid cooling system operates for extended periods, residual air will gradually be expelled, and the coolant itself will also dissipate over time. Therefore, it is necessary to replenish the liquid cooling system to ensure that the main circulation loop remains full of liquid. Currently, most liquid cooling units lack automatic replenishment capabilities, requiring maintenance personnel to bring replenishment equipment to the site for operation, which is costly and inconvenient. Alternatively, some liquid cooling units may have an internal independent replenishment pump and tank for automatic replenishment, but this significantly increases the cost of the liquid cooling unit, resulting in limited market acceptance. Utility Model Content

[0006] The technical problem this invention aims to solve is that existing liquid cooling systems using pneumatic expansion tanks have high maintenance costs, require regular gas filling, and cannot achieve automatic liquid replenishment. While high-level water tanks eliminate the need for gas filling, their installation layout is limited, requiring the tank to be placed at a high point in the system. To overcome these shortcomings, this invention provides a water tank that can be placed at either a high or low point in the system, fully ensuring the flexibility of the liquid cooling system layout. Simultaneously, the water tank eliminates the need for regular gas filling, reducing maintenance difficulty and costs.

[0007] To achieve the purpose of this utility model, the following technical solution is adopted:

[0008] A liquid cooling system equipped with a high-low compatible water tank includes a main circulation pipeline and a water tank. A solenoid valve, a check valve, and a water pump are sequentially connected on the main circulation pipeline from the inlet to the outlet. A pressure sensor is also connected to the main circulation pipeline. The pressure sensor is used to detect the pressure value of the coolant in the main circulation pipeline in real time and control the opening and closing of the solenoid valve based on the pressure value. A liquid injection branch is connected to the main circulation pipeline between the check valve and the water pump. A water tank branch is connected to the main circulation pipeline between the solenoid valve and the check valve, and the water tank branch is connected to the water tank. A breather valve is provided at the bottom of the water tank, connecting the water tank branch to the inner cavity of the water tank. The top of the water tank is open to the atmosphere, allowing the coolant in the water tank to either inject water into the main circulation pipeline or drain water into the water tank under the action of the breather valve. The water tank in this system, through the function of the bottom breather valve, can achieve maintenance-free operation, without the need for regular air replenishment, and is not limited by its placement location. It can be placed at a high or low position in the system, making its structural layout very flexible. At the same time, with the cooperation of the solenoid valve and the water tank, it can also achieve automatic liquid replenishment, injecting the coolant in the water tank into the main circulation loop of the liquid cooling system to ensure that the main circulation loop is always full of liquid.

[0009] Preferably, the water tank is equipped with a scale for measuring the liquid level. The scale allows for convenient control of the liquid level in the tank.

[0010] Preferably, a level switch is also installed at the bottom of the water tank. When the level drops to a certain lower limit, the level switch is triggered to issue an alarm.

[0011] Preferably, the top of the water tank is detachably connected to a top cover; the bottom of the top cover is provided with a communication hole that communicates with the atmosphere. The top cover is opened and closed by screwing on, and can be unscrewed by hand without the need for any tools. After unscrewing, liquid can be added to the water tank, which is convenient to operate. At the same time, it can effectively prevent foreign objects such as leaves, sand, and rainwater from entering the water tank when used outdoors, thereby ensuring the cleanliness of the coolant in the water tank.

[0012] Preferably, the lower part of the water tank is equipped with a drain ball valve for draining coolant. Opening the drain ball valve allows for easy adjustment of the water level in the tank to a suitable height, and then closing the valve.

[0013] Preferably, the upper part of the water tank is provided with an overflow port to prevent coolant from overflowing. This structure facilitates the diversion of excess liquid after the water tank is full into a designated container for collection and storage, thus avoiding waste of coolant.

[0014] Preferably, an inlet temperature sensor is installed on the main circulation pipeline between the energy storage battery module and the solenoid valve; an outlet temperature sensor is installed on the main circulation pipeline between the energy storage battery module and the electric heating unit. The inlet and outlet temperature sensors facilitate real-time monitoring of the coolant temperature on the pipeline.

[0015] Preferably, the injection branch is equipped with an injection ball valve for controlling the switching of the injection branch. The injection ball valve facilitates the control of the injection branch's flow.

[0016] Preferably, the system also includes an energy storage battery module; the liquid outlet of the energy storage battery module is connected to the liquid inlet of the main circulation pipeline; the liquid inlet of the energy storage battery module is connected to the liquid outlet of the main circulation pipeline; the energy storage battery module is composed of multiple vertically arranged energy storage battery packs, and each energy storage battery pack is equipped with a liquid cooling plate.

[0017] Preferably, a plate heat exchange unit is also connected to the main circulation pipeline at the outlet end of the water pump, and a refrigeration circulation branch is connected to the plate heat exchange unit. The plate heat exchange unit serves as a bridge between the main circulation pipeline and the refrigeration circulation branch, transferring the cooling capacity from the refrigeration circulation branch to the main circulation pipeline. The main circulation pipeline cools the energy storage battery pack by connecting to the energy storage battery module, and the heat exchange liquid cooling effect is further improved by the plate heat exchange unit.

[0018] In summary, the advantages of this utility model are that the water tank can be placed at both the high and low positions of the system, fully ensuring the flexibility of the layout; at the same time, the special structure of the water tank ensures that the liquid cooling system does not require regular gas filling and maintenance, reducing the difficulty and cost of operation and maintenance; in addition, the liquid cooling system can automatically replenish liquid and ensure unidirectional flow of coolant during replenishment, achieving the effect of rapid venting and ensuring the stable and reliable operation of the liquid cooling system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the liquid cooling system of this utility model, which is equipped with a high-low position compatible water tank.

[0020] Figure 2 This is a schematic diagram of the liquid cooling system (with energy storage battery module) of this utility model.

[0021] Figure 3 This is an overall schematic diagram of the liquid cooling system of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the water tank of this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the breathing valve of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Energy storage battery module; 2. Main circulation pipeline; 21. Solenoid valve; 22. Check valve; 23. Water pump; 24. Plate heat exchanger unit; 26. Inlet temperature sensor; 27. Outlet temperature sensor; 28. Pressure sensor; 3. Water tank; 30. Water tank inner cavity; 31. Breathing valve; 32. Scale; 33. Liquid level switch; 34. Top cover; 35. Connecting hole; 36. Drain ball valve; 37. Overflow port; 4. Liquid injection branch; 41. Liquid injection ball valve; 5. Water tank branch; 6. Refrigeration circulation branch; 7. Compressor; 8. Condenser fan; 9. Condenser; 10. Electronic expansion valve. Detailed Implementation

[0026] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0027] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0028] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 5As shown, a liquid cooling system equipped with a high-low compatible water tank includes an energy storage battery module 1, a main circulation pipeline 2, and a water tank 3. The energy storage battery module 1 consists of multiple vertically arranged energy storage battery packs, each of which is equipped with a liquid cooling plate to cool the energy storage battery packs through liquid cooling. The outlet end of the energy storage battery module 1 is connected to the inlet end of the main circulation pipeline 2; the inlet end of the energy storage battery module 1 is connected to the outlet end of the main circulation pipeline 2, thereby enabling the coolant to circulate. A solenoid valve 21, a one-way valve 22, a water pump 23, a plate heat exchange unit 24, and a pressure sensor 28 are sequentially connected on the main circulation pipeline 2 from the inlet to the outlet. A liquid injection branch 4 is connected on the main circulation pipeline 2 between the one-way valve 22 and the water pump 23. The liquid injection branch 4 is used to inject liquid into the system at the beginning, and a liquid injection ball valve 41 is provided on the liquid injection branch 4 to control the opening and closing of the liquid injection branch 4. The injection ball valve 41 facilitates the control of the inflow into the injection branch 4. A water tank branch 5 is connected to the main circulation pipeline 2 between the solenoid valve 21 and the check valve 22, and the water tank branch 5 is connected to the water tank 3. The solenoid valve 21, water tank 3, check valve 22, water pump 23, plate heat exchange unit 24, and pressure sensor 28 on the main circulation pipeline 2 combine to form a liquid cooling unit. A breather valve 31 is installed at the bottom of the water tank 3, connecting the water tank branch 5 to the inner cavity 30 of the water tank. The top of the water tank 3 is open to the atmosphere, allowing the coolant in the water tank 3 to either inject water into the main circulation pipeline 2 or drain water into the water tank 3 under the action of the breather valve 31. When the temperature of the coolant in the main circulation pipeline 2 rises, its volume expands, and its pressure increases. When the pressure exceeds the exhaust pressure of the breather valve 31 at the bottom of the water tank 3, the expanded liquid in the main circulation pipeline 2... The spring on the exhaust side of the breather valve 31 will open, and the coolant in the main circulation pipe 2 will flow into the water tank 3 through the gap. At this time, the liquid pressure in the system will decrease. When the pressure is lower than the exhaust pressure, the valve will automatically close under the force of the spring. When the temperature of the coolant in the main circulation pipe 2 decreases or is lost, the volume will shrink and the pressure will decrease. When the pressure is lower than the intake pressure of the breather valve 31 at the bottom of the water tank 3, the liquid in the water tank 3 will open the valve on the intake side of the breather valve 31, and the coolant in the water tank 3 will flow into the main circulation pipe 2 through the gap to achieve automatic liquid replenishment until the system is full of liquid and the pressure rises above the intake pressure. Then the valve on the intake side will close again, thus ensuring that the pressure of the liquid cooling unit in the liquid cooling system is always between the intake pressure and the exhaust pressure. Figure 5 The diagram shows the structural principle of the breather valve 31. Since both the intake and exhaust processes are directly connected to the atmosphere, there is no need to periodically add air to the water tank 3 for maintenance. Furthermore, the intake and exhaust pressures are controlled by the spring pressure inside the breather valve 31, preventing the coolant in the main circulation pipe 2 from flowing back into the water tank 3 due to pressure generated by its own height difference. This allows the water tank 3 to be placed either at a high or low position in the system, making its structural layout very flexible.

[0031] like Figures 1 to 3As shown, a one-way valve 22 is installed on the liquid inlet side of the main circulation pipeline 2, that is, near the inlet of the water pump 23. When the liquid injection ball valve 41 is opened to inject liquid into the system, the coolant can only flow in one direction as shown by the arrow. This can quickly squeeze the air in the system to the water tank 3 and discharge it through the water tank 3. This allows the main circulation pipeline 2 to efficiently reach a state of being filled with liquid, greatly improving the filling speed. This effectively solves the problem that when there was no one-way valve 22, the coolant would flow in both directions at the same time, which would easily cause air to accumulate in places with small internal flow channels, such as the liquid cooling plate or plate heat exchange unit 24, making it impossible to discharge the air in the system smoothly and causing harm to the system operation.

[0032] like Figures 1 to 3 As shown, a pressure sensor 28 is installed at the outlet of the energy storage battery module 1 on the main circulation pipeline 2, which facilitates real-time detection of the coolant pressure on the pipeline. A solenoid valve 21 is installed at the inlet of the main circulation pipeline 2, which is used to open or close the main circulation pipeline 2. A water tank 3 is placed between the solenoid valve 21 and the check valve 22. When the system is low on liquid, the supply pressure will decrease. When the pressure is lower than the lower limit set by the pressure sensor 28, a control signal is triggered to close the solenoid valve 21. At this time, under the suction of the water pump 23, the liquid pressure at the connection between the bottom of the water tank 3 and the main circulation pipeline 2 will drop suddenly, triggering the vacuum valve of the breather valve 31 at the bottom of the water tank 3 to open. The coolant in the water tank 3 is then drawn into the main circulation pipeline 2 through the opening channel, realizing the liquid replenishment function. When the liquid in the main circulation pipeline 2 is replenished, the liquid pressure increases, and the vacuum valve of the breather valve 31 at the bottom of the water tank 3 closes. When the liquid supply pressure exceeds the upper limit set by the pressure sensor 28, a control signal is triggered to reopen the solenoid valve 21, completing the liquid replenishment. This facilitates rapid liquid replenishment and also allows for real-time detection of any leaks in the system.

[0033] like Figure 4As shown, the upper part of the water tank 3 is equipped with an overflow port 37 to prevent coolant from overflowing. This facilitates the drainage of excess liquid after the water tank 3 is filled into a designated container for collection and storage, avoiding coolant waste. When coolant is injected into the main circulation pipe 2 from the injection branch 4, air in the system is forced out of the water tank 3. During this process, coolant also enters the water tank 3. To prevent spraying after the water tank 3 is filled, an overflow port 37 is provided on the side of the water tank near the top. The overflow port 37 can be connected to a hose to drain excess liquid after the water tank 3 is filled into a designated container. In addition, if a safety valve is installed in the system, the pressure relief port of the safety valve can be connected to the overflow port 37 of the water tank 3 through a hose. When the pressure is too high during system operation, the pressure will be released through the safety valve and eventually released to the water tank connected to the atmosphere. If any liquid is discharged during the pressure relief process, this liquid will flow to the water tank 3 through the hose and be collected and stored, avoiding coolant waste.

[0034] like Figure 4 As shown, a drain ball valve 36 for draining coolant is installed at the bottom of the water tank 3. The function of the drain ball valve 36 is to enable the water tank 3 to act as a buffer and stabilize pressure. After the liquid cooling system is filled with coolant and before formal start-up, the liquid level in the water tank 3 needs to be adjusted to a suitable height so that the amount of coolant in the water tank 3 is neither too much nor too little. The liquid in the water tank 3 cannot be too little, otherwise when the coolant in the main circulation pipe 2 cools down and shrinks in volume or dissipates, the liquid in the water tank will not be enough to compensate for the loss of liquid. The liquid in the water tank 3 cannot be too much either, otherwise when the coolant in the main circulation pipe 2 cools up and expands in volume, the cavity in the water tank 3 will not be enough to accommodate the expansion, causing the excess liquid to be discharged from the overflow port 37 of the water tank 3, resulting in waste of coolant. To facilitate the adjustment of the liquid level in water tank 3, the drain ball valve 36 is located in the lower middle part of water tank 3. During operation, the liquid level in the water tank can be adjusted to a suitable height by opening the drain ball valve 36, and then the drain ball valve 36 can be closed. The operation is convenient and quick.

[0035] like Figure 4 As shown, considering the thermal expansion and contraction effect of the coolant, the liquid level is correlated with the temperature. Therefore, a scale 32 for measuring the liquid level is installed in the water tank 3 to facilitate control of the liquid level. When the temperature is low, the initial filling of the water tank 3 should be done at a low level to allow sufficient space for the volume expansion of the coolant as the temperature rises. When the temperature is high, the initial filling of the water tank 3 should be done at a high level so that when the coolant temperature decreases and its volume contracts, there is enough liquid in the water tank 3 to replenish the main circulation pipe 2, ensuring that the main circulation pipe 2 returns to a full state.

[0036] like Figure 4As shown, to ensure timely replenishment of liquid when the liquid level in water tank 3 is too low (otherwise, if the main circulation pipeline 2 is low on liquid, the liquid in water tank 3 may not be sufficient to fill the pipeline, negatively impacting system operation), a liquid level switch 33 is installed at the bottom of water tank 3. When the liquid level drops to a certain lower limit, the switch is triggered to alert maintenance personnel to add liquid to the tank. Simultaneously, a top cover 34 is detachably connected to the top of water tank 3; the bottom of the top cover 34 has a connecting hole 35 that communicates with the atmosphere. In this embodiment, the top cover 34 is opened and closed by screwing on a threaded mechanism. It can be opened directly by hand without the need for any tools. After opening, liquid can be added to the water tank. The operation is convenient and also makes it easy to use outdoors. It can effectively prevent foreign objects such as leaves, dust, and rainwater from entering the water tank 3, thereby ensuring the cleanliness of the coolant in the water tank 3.

[0037] like Figure 3 As shown, an inlet temperature sensor 26 is installed on the main circulation pipeline 2 between the energy storage battery module 1 and the solenoid valve 21; an outlet temperature sensor 27 is installed at the outlet end of the main circulation pipeline 2. The inlet temperature sensor 26 and the outlet temperature sensor 27 facilitate real-time monitoring of the coolant temperature on the pipeline. A refrigeration circulation branch 6 is also connected to the plate heat exchange unit 24; the plate heat exchange unit 24 acts as a bridge between the main circulation pipeline 2 and the refrigeration circulation branch 6, transferring the cooling capacity from the refrigeration circulation branch 6 to the main circulation pipeline 2; the refrigeration circulation branch 6 is connected sequentially from the inlet to the outlet direction to a compressor 7, a condenser fan 8, a condenser 9, and an electronic expansion valve 10; the inlet end of the compressor 7 is connected to the outlet end of the plate heat exchange unit 24, and the outlet end of the electronic expansion valve 10 is connected to the inlet end of the plate heat exchange unit 24. The compressor 7, condenser fan 8, condenser 9, and electronic expansion valve 10 on the plate heat exchange unit 24 further enhance the heat exchange effect.

[0038] The beneficial effects of this utility model include the following four points:

[0039] 1. The combination of water tank 3 and solenoid valve 21 in the liquid cooling unit can achieve maintenance-free operation, eliminate the need for regular gas filling, and is not limited by the placement location, whether placed at a high or low position in the system, thus fully ensuring the flexibility of the liquid cooling system layout.

[0040] 2. The specific water tank structure ensures that the liquid cooling unit does not require regular gas filling and maintenance, reducing the difficulty and cost of operation and maintenance;

[0041] 3. When filling the liquid cooling system, the air in the system can be quickly discharged under the action of the one-way valve 22, so that the liquid cooling system is filled with liquid and avoids affecting the normal and stable operation of the system due to air accumulation.

[0042] 4. During long-term operation of the liquid cooling system, the residual air in the system will be gradually expelled over time, and the coolant itself will be lost to a certain extent, thus forming a cavity in the system. At this time, the liquid cooling system can automatically replenish the coolant by using the breather valve 31 in the water tank 3 to automatically inject the coolant into the main circulation loop of the liquid cooling system, so as to ensure that the main circulation pipe 2 is always full of liquid.

[0043] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0044] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included 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 liquid cooling system equipped with a high-low level compatible water tank, characterized in that, The system includes a main circulation pipeline (2) and a water tank (3); a solenoid valve (21), a check valve (22), and a water pump (23) are connected sequentially from the inlet to the outlet on the main circulation pipeline (2); a pressure sensor (28) is also connected to the main circulation pipeline (2); the pressure sensor (28) is used to detect the pressure value of the coolant in the main circulation pipeline (2) in real time, and to control the opening and closing of the solenoid valve (21) by the pressure value; the main circulation pipeline (2) is located between the check valve (22) and the water pump (23). A liquid injection branch (4) is connected between the main circulation pipeline (2) and the solenoid valve (21) and the check valve (22), and the water tank branch (5) is connected to the water tank (3); a breather valve (31) is provided at the bottom of the water tank (3) to connect the water tank branch (5) and the water tank cavity (30); the top of the water tank (3) is connected to the atmosphere, and the coolant in the water tank (3) is injected into the main circulation pipeline (2) or drained into the water tank (3) under the action of the breather valve (31).

2. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, The water tank (3) is equipped with a scale (32) for measuring the liquid level.

3. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, The bottom of the water tank (3) is also equipped with a liquid level switch (33). When the liquid level drops to a certain lower limit, the liquid level switch (33) is triggered to alarm.

4. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, The water tank (3) is detachably connected to a top cover (34); the bottom of the top cover (34) is provided with a communication hole (35) that communicates with the atmosphere.

5. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, The lower part of the water tank (3) is provided with a drain ball valve (36) for draining coolant.

6. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, The upper part of the water tank (3) is provided with an overflow port (37) to prevent coolant from overflowing from the top.

7. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, A liquid inlet temperature sensor (26) is provided at the liquid inlet end of the main circulation pipeline (2); a liquid outlet temperature sensor (27) is provided at the liquid outlet end of the main circulation pipeline (2).

8. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, The injection branch (4) is equipped with an injection ball valve (41) for controlling the switching of the injection branch (4).

9. The liquid cooling system equipped with a high-low position compatible water tank according to claim 1, characterized in that, It also includes an energy storage battery module (1); the liquid outlet of the energy storage battery module (1) is connected to the liquid inlet of the main circulation pipeline (2); the liquid inlet of the energy storage battery module (1) is connected to the liquid outlet of the main circulation pipeline (2), and the energy storage battery module (1) is composed of multiple vertically arranged energy storage battery packs, and each energy storage battery pack is equipped with a liquid cooling plate.

10. The liquid cooling system equipped with a high-low position compatible water tank according to claim 9, characterized in that, A plate heat exchange unit (24) is also connected to the liquid outlet side of the water pump (23) on the main circulation pipeline (2), and a refrigeration circulation branch (6) is also connected to the plate heat exchange unit (24); the plate heat exchange unit (24) is used as a bridge between the main circulation pipeline (2) and the refrigeration circulation branch (6), and transfers the cold energy in the refrigeration circulation branch (6) to the main circulation pipeline (2).

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