Energy storage liquid cooling system and use method thereof

Abstract

The present invention discloses an energy storage liquid cooling system and its use method, including a vacuum pumping device, a liquid injection device, a three-way valve, a water cooling unit and a liquid cooling circuit; the air inlet of the vacuum pumping device is connected to the first valve port pipeline of the three-way valve through a liquid storage tank, and the second valve port of the three-way valve is connected to the liquid injection port pipeline of the liquid injection device; the third valve port of the three-way valve is connected to the water inlet pipeline of the water cooling unit, and is connected to the liquid cooling circuit pipeline through the water cooling unit; a pressure relief port is provided on the liquid storage tank, and a liquid drain port is provided on the liquid cooling circuit. When draining liquid, the present invention relies on the vacuum pumping device to evacuate the air in the liquid cooling circuit, and then allows the liquid cooling circuit to maintain a closed vacuum state, and then injects coolant into the liquid cooling circuit through the liquid injection device, so as to achieve efficient liquid injection and avoid air residue in the pipe. At the same time, relying on the same tooling and pipelines, the liquid storage tank, the drain port and the vacuum pumping device can also be combined to achieve efficient negative pressure drainage, thereby improving the operating efficiency of the liquid cooling system.

Description

Technical Field

[0001] The present invention relates to the field of liquid cooling technology, and in particular to an energy storage liquid cooling system and a method of using the same. Background Art

[0002] Currently, the cooling technologies for lithium battery energy storage systems primarily rely on air cooling and liquid cooling. Liquid cooling processes urgently need to mature, and efficient injection of coolant into the energy storage system pipelines and subsequent drainage are crucial. The commonly used coolant is an ethylene glycol-water solution, an organic solvent primarily composed of ethylene glycol and water. Ethylene glycol is an alcohol. The presence of oxidants in liquid cooling systems (such as oxygen in the air) can easily oxidize to acids, leading to acid corrosion, which can easily corrode aluminum water-cooled plates and pipelines.

[0003] In the existing injection process of energy storage systems, some use an open system and directly pour water coolant from the injection port. However, this will result in low water pressure in the pipeline, making it impossible to completely expel the air in the pipeline, and frequent secondary refilling is required; others use an external water pump to pressurize the pipeline to inject water coolant into the pipeline, but there are problems with low exhaust efficiency and a long time required for a single injection. The water coolant in the pipeline needs to be self-circulated multiple times to expel the air; at the same time, after the coolant has been used for a long time, the existing energy storage system also has the problem of incomplete drainage when draining, which seriously affects the operating efficiency of the liquid cooling system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to propose an energy storage liquid cooling system and a method of using the same, so as to achieve efficient liquid drainage and liquid injection on the same tooling, thereby improving the operating efficiency of the liquid cooling system.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An energy storage liquid cooling system includes a vacuum pumping device, a liquid injection device, a three-way valve, a water cooling unit and a liquid cooling circuit;

[0007] The air inlet of the vacuum pumping device is connected to the first valve port pipeline of the three-way valve through the liquid storage tank, and the second valve port of the three-way valve is connected to the liquid injection port pipeline of the liquid injection device;

[0008] The third valve port of the three-way valve is connected to the water inlet pipe of the water cooling unit, and is connected to the liquid cooling circuit pipe through the water cooling unit;

[0009] The liquid storage tank is provided with a pressure relief port, and the liquid cooling circuit is provided with a liquid drain port.

[0010] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0011] A method for using an energy storage liquid cooling system, applied to the above-mentioned energy storage liquid cooling system, comprises the following steps:

[0012] S1. During liquid injection, the first and third valve ports of the three-way valve are controlled to be connected, the pressure relief port and the liquid drain port are closed, and the air in the liquid cooling circuit is extracted through the vacuum extraction device;

[0013] S2. Close the water inlet of the water cooling unit, open the pressure relief port, and relieve the pressure of the pipeline connected to the liquid storage tank and the three-way valve;

[0014] S3, controlling the second valve port and the third valve port of the three-way valve to be connected, opening the water inlet of the water cooling unit, controlling the liquid injection device to inject liquid into the liquid cooling circuit through the water cooling unit, and closing the water inlet of the water cooling unit after the liquid injection is completed;

[0015] S4. When draining, control the first valve port and the third valve port of the three-way valve to be connected, close the pressure relief port and the drain port, introduce the coolant in the liquid cooling circuit into the liquid storage tank through the vacuum pumping device, close the water inlet of the water cooling unit, open the drain port, and complete the drainage.

[0016] The beneficial effects of the present invention are as follows: the present invention provides an energy storage liquid cooling system and a method of using the same, using a three-way valve to respectively connect a vacuum pumping device, a liquid injection device, and a liquid cooling circuit with a water cooling unit. When draining, the air in the liquid cooling circuit is evacuated by the vacuum pumping device, and then the liquid cooling circuit is kept in a closed vacuum state, and then the coolant is injected into the liquid cooling circuit through the liquid injection device, and the liquid is efficiently injected to avoid air residue in the pipe. At the same time, relying on the same tooling and pipelines, the liquid storage tank, the drain port and the vacuum pumping device can also be combined to achieve efficient negative pressure drainage, thereby improving the operating efficiency of the liquid cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an energy storage liquid cooling system of the present invention;

[0018] Figure 2 A schematic diagram of the airflow direction of an energy storage liquid cooling system during exhaust of the present invention;

[0019] Figure 3 A schematic diagram of the coolant flow direction of an energy storage liquid cooling system during liquid injection according to the present invention;

[0020] Figure 4 A schematic diagram of the coolant flow direction of an energy storage liquid cooling system during discharge of the present invention;

[0021] Figure 5 The figure is a schematic diagram of the steps of a method for using an energy storage liquid cooling system of the present invention.

[0022] Description of labels:

[0023] 1. Three-way valve; 2. Liquid cooling circuit; 3. Water cooling unit; 4. Liquid storage tank; 5. Pressure relief port; 6. Drain port; 7. Two-way valve; 8. Water pump; 9. Vacuum pump; 10. Liquid replenishing tank; 11. Liquid replenishing pump. DETAILED DESCRIPTION

[0024] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0025] Please refer to Figures 1 to 4 , an energy storage liquid cooling system, comprising a vacuum pumping device, a liquid injection device, a three-way valve 1, a water cooling unit 3 and a liquid cooling circuit 2;

[0026] The air inlet of the vacuum pumping device is connected to the first valve port pipeline of the three-way valve 1 through the liquid storage tank 4, and the second valve port of the three-way valve 1 is connected to the liquid injection port pipeline of the liquid injection device;

[0027] The third valve port of the three-way valve 1 is connected to the water inlet pipe of the water cooling unit 3, and is connected to the liquid cooling circuit 2 pipe through the water cooling unit 3;

[0028] The liquid storage tank 4 is provided with a pressure relief port 5 , and the liquid cooling circuit 2 is provided with a liquid drain port 6 .

[0029] From the above description, it can be seen that the beneficial effects of the present invention are: the three-way valve 1 is used to respectively connect the vacuum pumping device, the liquid injection device, and the liquid cooling circuit 2 with the water cooling unit 3. When draining, the air in the liquid cooling circuit 2 is evacuated by relying on the vacuum pumping device, and then the liquid cooling circuit 2 is kept in a closed vacuum state, and then the coolant is injected into the liquid cooling circuit 2 through the liquid injection device, and the liquid is efficiently injected to avoid air residue in the pipe. At the same time, relying on the same tooling and pipelines, the liquid storage tank 4, the drain port 6 and the vacuum pumping device can also be combined to achieve efficient negative pressure drainage, thereby improving the operating efficiency of the liquid cooling system.

[0030] Furthermore, the water cooling unit 3 includes a two-way valve 7 and a water pump 8;

[0031] One end of the two-way valve 7 is connected to the third valve port pipeline of the three-way valve 1, and the other end of the two-way valve 7 is connected to the water inlet pipeline of the water pump 8;

[0032] The water pump 8 is disposed on the liquid cooling circuit 2 .

[0033] From the above description, it can be seen that the water cooling unit 3 is mainly composed of a two-way valve 7 and a water pump 8. The two-way valve 7 controls whether the liquid cooling circuit 2 is in a closed state, assisting in achieving negative pressure in the pipe, etc., while the water pump 8 accelerates the circulation flow speed of the coolant in the liquid cooling circuit 2 to enhance the cooling effect.

[0034] Furthermore, the vacuum extraction device includes a vacuum pump 9;

[0035] The air inlet of the vacuum pump 9 is connected to the upper air vent pipeline of the liquid storage tank 4, and the bottom of the liquid storage tank 4 is provided with a through hole connected to the first valve port pipeline of the three-way valve 1.

[0036] From the above description, it can be seen that the vacuum extraction device mainly uses the vacuum pump 9 to perform extraction and exhaust operations, and the liquid storage tank 4 cooperates with the vacuum pump 9. The interior of the liquid storage tank 4 serves as a component of the ventilation pipeline and also serves as a coolant storage area during drainage. It cooperates with the three-way valve 1 to achieve multi-purpose use, making the system highly integrated, effectively reducing the redundancy of tooling, and improving the system operation efficiency.

[0037] Furthermore, the liquid injection device includes a liquid infusion tank 10 and a liquid infusion pump 11;

[0038] The liquid outlet of the liquid replenishing tank 10 is connected to the water inlet pipeline of the liquid replenishing pump 11 , and the liquid outlet of the liquid replenishing pump 11 is connected to the second valve port pipeline of the three-way valve 1 .

[0039] As can be seen from the above description, the liquid replenishing pump 11 provides power to transport the coolant in the liquid replenishing tank 10 to the liquid cooling circuit 2 .

[0040] Furthermore, the liquid cooling circuit 2 comprises a U-shaped circuit for placement adjacent to the energy storage device;

[0041] The U-shaped loop includes two vertical pipelines and one horizontal pipeline, and a drain port 6 is provided at the connection between the vertical pipeline and the horizontal pipeline.

[0042] As can be seen from the above description, a drain port 6 is provided at the connection between the vertical pipeline and the horizontal pipeline of the U-shaped loop, which helps to increase the drainage speed.

[0043] Furthermore, it also includes a main controller;

[0044] The pressure relief port 5 and the liquid discharge port 6 are both provided with conduction valves;

[0045] The main controller is electrically connected to the vacuum pumping device, the liquid injection device, the three-way valve 1, the water cooling unit 3 and the conduction valve respectively.

[0046] From the above description, it can be seen that by setting up an electric controller, the status of each component of the liquid cooling system can be automatically controlled, and the control part can be integrated into the energy storage system.

[0047] Please refer to Figure 5 A method for using an energy storage liquid cooling system, applied to the above-mentioned energy storage liquid cooling system, comprises the following steps:

[0048] S1. During liquid injection, the first and third valve ports of the three-way valve 1 are controlled to be connected, the pressure relief port 5 and the liquid drain port 6 are closed, and the air in the liquid cooling circuit 2 is extracted through the vacuum extraction device;

[0049] S2. Close the water inlet of the water cooling unit 3, open the pressure relief port 5, and relieve the pressure of the pipeline connected to the liquid storage tank 4 and the three-way valve 1;

[0050] S3, controlling the second valve port and the third valve port of the three-way valve 1 to be connected, opening the water inlet of the water-cooling unit 3, controlling the liquid injection device to inject liquid into the liquid cooling circuit 2 through the water-cooling unit 3, and closing the water inlet of the water-cooling unit 3 after the liquid injection is completed;

[0051] S4. When draining, control the first valve port and the third valve port of the three-way valve 1 to be connected, close the pressure relief port 5 and the drain port 6, introduce the coolant in the liquid cooling circuit 2 into the liquid storage tank 4 through the vacuum pumping device, close the water inlet of the water cooling unit 3, open the drain port 6, and complete the drainage.

[0052] From the above description, it can be seen that the beneficial effects of the present invention are: the three-way valve 1 is used to respectively connect the vacuum pumping device, the liquid injection device, and the liquid cooling circuit 2 with the water cooling unit 3. When draining, the air in the liquid cooling circuit 2 is evacuated by relying on the vacuum pumping device, and then the liquid cooling circuit 2 is kept in a closed vacuum state, and then the coolant is injected into the liquid cooling circuit 2 through the liquid injection device, and the liquid is efficiently injected to avoid air residue in the pipe. At the same time, relying on the same tooling and pipelines, the liquid storage tank 4, the drain port 6 and the vacuum pumping device can also be combined to achieve efficient negative pressure drainage, thereby improving the operating efficiency of the liquid cooling system.

[0053] Furthermore, the closing of the water inlet of the water cooling unit 3 is specifically as follows:

[0054] Close the two-way valve 7;

[0055] The specific steps of opening the water inlet of the water cooling unit 3 are as follows:

[0056] Open the two-way valve 7.

[0057] As can be seen from the above description, the two-way valve 7 is used to control whether the liquid cooling circuit 2 is in a closed state, thereby assisting in achieving negative pressure in the pipe.

[0058] Furthermore, the control liquid injection device injects liquid into the liquid cooling circuit 2 through the water cooling unit 3 specifically as follows:

[0059] The liquid replenishing pump 11 is started to deliver the coolant in the liquid replenishing tank 10 to the liquid cooling circuit 2 through the three-way valve 1 and the water cooling unit 3 in sequence.

[0060] From the above description, it can be seen that the vacuum extraction device mainly uses the vacuum pump 9 to perform extraction and exhaust operations, and the liquid storage tank 4 cooperates with the vacuum pump 9. The interior of the liquid storage tank 4 serves as a component of the ventilation pipeline and also serves as a coolant storage area during drainage. It cooperates with the three-way valve 1 to achieve multi-purpose use, making the system highly integrated, effectively reducing the redundancy of tooling, and improving the system operation efficiency.

[0061] Please refer to Figures 1 to 4 , embodiment 1 of the present invention is:

[0062] An energy storage liquid cooling system, such as Figure 1 As shown, it includes a vacuum pumping device, a liquid injection device, a three-way valve 1, a water cooling unit 3 and a liquid cooling circuit 2. The water cooling unit 3 includes a two-way valve 7 and a water pump 8. The liquid injection device includes a liquid replenishing tank 10 and a liquid replenishing pump 11.

[0063] The air inlet of the vacuum pumping device is connected to the first valve port pipeline of the three-way valve 1 through the liquid storage tank 4, the liquid outlet of the liquid replenishing tank 10 is connected to the water inlet pipeline of the liquid replenishing pump 11, and the liquid outlet of the liquid replenishing pump 11 is connected to the second valve port pipeline of the three-way valve 1; one end of the two-way valve 7 is connected to the third valve port pipeline of the three-way valve 1, and the other end of the two-way valve 7 is connected to the water inlet pipeline of the water pump 8, and the water pump 8 is arranged on the liquid cooling circuit 2; a pressure relief port 5 is provided on the liquid storage tank 4, and a drain port 6 is provided on the liquid cooling circuit 2.

[0064] In this embodiment, the vacuum exhaust device includes a vacuum pump 9; the air inlet of the vacuum pump 9 is connected to the upper air vent pipe of the liquid storage tank 4, and the bottom of the liquid storage tank 4 is provided with a through hole connected to the first valve port pipe of the three-way valve 1.

[0065] In this embodiment, the energy storage liquid cooling system integrates exhaust, liquid injection, and liquid drainage, as shown below:

[0066] Reference Figure 2 As shown, when the first valve port and the third valve port of the third-way valve 1 are connected, the vacuum pumping device, the three-way valve 1, the two-way valve 7 and the liquid cooling circuit 2 form a ventilation circuit, and the vacuum pumping device removes the air in the liquid cooling circuit 2, and then the two-way valve 7 is closed, forming a negative pressure in the liquid cooling circuit 2;

[0067] Reference Figure 3 As shown, when the second valve port and the third valve port of the third-way valve 1 are connected, the liquid injection device, the three-way valve 1, the two-way valve 7 and the liquid cooling circuit 2 form a liquid injection path, and the cooling water in the liquid injection tank 10 is injected into the liquid cooling circuit 2 by the liquid injection pump 11;

[0068] Reference Figure 4As shown, when the first valve port and the third valve port of the third-way valve 1 are connected, the vacuum pump 9, the liquid storage tank 4, the three-way valve 1, the two-way valve 7 and the liquid cooling circuit 2 form a drainage passage, and the coolant in the liquid cooling circuit 2 is drawn into the liquid storage tank 4 by the vacuum pump 9, and then a negative pressure is formed in the liquid cooling circuit 2, and then the drain port 6 is opened to discharge the remaining coolant through the negative pressure.

[0069] In this embodiment, the liquid cooling circuit 2 comprises a U-shaped circuit for placement adjacent to the energy storage device;

[0070] The U-shaped loop includes two vertical pipelines and one horizontal pipeline. A drain port 6 is provided at the connection between the vertical pipeline and the horizontal pipeline.

[0071] Please refer to Figure 5 , the second embodiment of the present invention is:

[0072] A method for using an energy storage liquid cooling system, such as Figure 5 As shown, an energy storage liquid cooling system applied to Example 1 includes the following steps:

[0073] S1. During liquid injection, the first and third valve ports of the three-way valve 1 are controlled to be connected, the pressure relief port 5 and the liquid drain port 6 are closed, and the air in the liquid cooling circuit 2 is extracted through the vacuum extraction device;

[0074] S2. Close the water inlet of the water cooling unit 3, open the pressure relief port 5, and relieve the pressure of the pipeline connected to the liquid storage tank 4 and the three-way valve 1;

[0075] In this embodiment, combined with Figure 2 As shown, during liquid injection, air is first pumped out, the first valve port and the third valve port of the three-way valve 1 are controlled to be connected, the pressure relief port 5 and the liquid drain port 6 are closed, the two-way valve 7 is opened, and the water pump 8 is turned off; the air in the pipeline is pumped out by the vacuum pump 9 to form a certain vacuum degree; then the two-way valve 7 is closed, so that the pipeline system from the water cooling unit 3 to the battery cluster becomes a closed pipeline system, and at the same time the vacuum pump 9 is turned off and the pressure relief port 5 is opened to discharge the negative pressure in the external pipeline including the three-way valve 1.

[0076] S3, controlling the second valve port and the third valve port of the three-way valve 1 to be connected, opening the water inlet of the water-cooling unit 3, controlling the liquid injection device to inject liquid into the liquid cooling circuit 2 through the water-cooling unit 3, and closing the water inlet of the water-cooling unit 3 after the liquid injection is completed;

[0077] In this embodiment, combined with Figure 3As shown, after the gas is extracted, the water-cooling liquid is pressurized into the pipeline through the injection pump, the discharge port 6 remains closed, and the water pump 8 of the water-cooling unit 3 is also closed. The two-way valve 7 is opened to maintain a passage from the water-cooling unit 3 to the liquid cooling circuit 2; when the water pressure in the liquid cooling circuit 2 reaches a certain value, the two-way valve 7 is closed to close the entire liquid cooling circuit 2, and the liquid replenishing pump 11 is turned off at the same time.

[0078] S4. When draining, control the first valve port and the third valve port of the three-way valve 1 to be connected, close the pressure relief port 5 and the drain port 6, introduce the coolant in the liquid cooling circuit 2 into the liquid storage tank 4 through the vacuum pumping device, close the water inlet of the water cooling unit 3, open the drain port 6, and complete the drainage.

[0079] In this embodiment, combined with Figure 4 As shown, after the water-cooling liquid has been used for 2 to 3 years, it is necessary to discharge the water-cooling liquid in the pipeline and replace it; at this time, close the drain port 6, the pressure relief port 5 and the water pump 8 of the water-cooling unit 3, open the two-way valve 7, and maintain a passage between the water-cooling unit 3 and the liquid cooling circuit 2; control the first valve port and the third valve port of the three-way valve 1 to be connected, and turn on the vacuum pump 9. The water-cooling liquid in the pipeline will be drawn out and flow into the liquid storage tank 4 due to the negative pressure. Due to the negative pressure, the space in the pipe will be squeezed to a certain extent, and part of the water-cooling liquid may not be drawn out. At this time, close the two-way valve 7 and the vacuum pump 9, and discharge the remaining water-cooling liquid by opening the drain port 6.

[0080] In summary, the present invention provides an energy storage liquid cooling system and a method of using the same, which utilizes a three-way valve to respectively connect a vacuum pumping device, a liquid injection device, and a liquid cooling circuit with a water cooling unit. When draining, the air in the liquid cooling circuit is evacuated by the vacuum pumping device, and then the liquid cooling circuit is maintained in a closed vacuum state, and then the coolant is injected into the liquid cooling circuit through the liquid injection device, which efficiently injects liquid and avoids air residue in the pipe. At the same time, relying on the same tooling and pipelines, the liquid storage tank, the drain port and the vacuum pumping device can also be combined to achieve efficient negative pressure drainage, thereby improving the operating efficiency of the liquid cooling system.

[0081] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the scope of the present invention's patent protection.

Claims

1. An energy storage liquid cooling system, characterized in that: It includes vacuum pumping device, liquid injection device, three-way valve, water cooling unit and liquid cooling circuit; The air inlet of the vacuum pumping device is connected to the first valve port pipeline of the three-way valve through the liquid storage tank, and the second valve port of the three-way valve is connected to the liquid injection port pipeline of the liquid injection device; The third valve port of the three-way valve is connected to the water inlet pipe of the water cooling unit, and is connected to the liquid cooling circuit pipe through the water cooling unit; The liquid storage tank is provided with a pressure relief port, and the liquid cooling circuit is provided with a liquid drain port; The water cooling unit includes a two-way valve and a water pump; One end of the two-way valve is connected to the third valve port pipeline of the three-way valve, and the other end of the two-way valve is connected to the water inlet pipeline of the water pump; The water pump is arranged on the liquid cooling circuit; The vacuum extraction device includes a vacuum pump; The air inlet of the vacuum pump is connected to the upper air vent pipe of the liquid storage tank, and the bottom of the liquid storage tank is provided with a through hole connected to the first valve port pipe of the three-way valve; The pressure relief port and the liquid discharge port are both provided with a conduction valve; The main controller is electrically connected to the vacuum pumping device, the liquid injection device, the three-way valve, the water cooling unit and the conduction valve respectively; The vacuum pumping device is used to introduce the coolant in the liquid cooling circuit into the liquid storage tank.

2. The energy storage liquid cooling system according to claim 1, characterized in that: The liquid injection device includes a liquid infusion tank and a liquid infusion pump; The liquid outlet of the liquid replenishing tank is connected to the water inlet pipeline of the liquid replenishing pump, and the liquid outlet of the liquid replenishing pump is connected to the second valve port pipeline of the three-way valve.

3. The energy storage liquid cooling system according to claim 1, characterized in that: The liquid cooling circuit includes a U-shaped loop for placement adjacent to the energy storage device; The U-shaped loop includes two vertical pipelines and one horizontal pipeline, and the connection between the vertical pipeline and the horizontal pipeline is provided with a drainage port.

4. A method for using an energy storage liquid cooling system, applied to an energy storage liquid cooling system according to any one of claims 1 to 3, characterized in that: The steps include: S1. During liquid injection, the first and third valve ports of the three-way valve are controlled to be connected, the pressure relief port and the liquid drain port are closed, and the air in the liquid cooling circuit is extracted through the vacuum extraction device; S2. Close the water inlet of the water cooling unit, open the pressure relief port, and relieve the pressure of the pipeline connected to the liquid storage tank and the three-way valve; S3, controlling the second valve port and the third valve port of the three-way valve to be connected, opening the water inlet of the water cooling unit, controlling the liquid injection device to inject liquid into the liquid cooling circuit through the water cooling unit, and closing the water inlet of the water cooling unit after the liquid injection is completed; S4. When draining, control the first valve port and the third valve port of the three-way valve to be connected, close the pressure relief port and the drain port, introduce the coolant in the liquid cooling circuit into the liquid storage tank through the vacuum pumping device, close the water inlet of the water cooling unit, open the drain port, and complete the drainage.

5. The method for using the energy storage liquid cooling system according to claim 4, characterized in that: The method of closing the water inlet of the water cooling unit is specifically as follows: Close the two-way valve; The specific steps of opening the water inlet of the water cooling unit are as follows: Open the two-way valve.

6. The method for using the energy storage liquid cooling system according to claim 4, characterized in that: The control liquid injection device injects liquid into the liquid cooling circuit through the water cooling unit specifically as follows: Start the liquid replenishing pump to transport the coolant in the liquid replenishing tank to the liquid cooling circuit through the three-way valve and the water cooling unit in sequence.

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