A method for quickly injecting liquid into an energy storage liquid cooling system and an energy storage liquid cooling system

Abstract

The present disclosure relates to a method for rapid liquid injection of an energy storage liquid cooling system and an energy storage liquid cooling system, which is applied to an energy storage liquid cooling system. The energy storage liquid cooling system includes a pump, a refrigeration unit, a refrigeration pipeline and an exhaust valve. The two ends of the refrigeration pipeline are respectively connected to the liquid outlet and the liquid return end of the refrigeration unit to form a refrigeration circuit. The method includes the following steps: establishing a discharge pipeline connected to the end of the refrigeration circuit, the end of the discharge pipeline is a discharge outlet; opening the exhaust valve, starting the pump, and pumping refrigerant into the refrigeration circuit through the pump; when refrigerant appears at the discharge outlet, the pump is allowed to continue pumping liquid for a period of time t and then closed to discharge the refrigerant in the discharge pipeline; starting the pump and continuing to discharge the remaining gas in the refrigeration circuit until the internal pressure of the refrigeration circuit is adjusted to pressure P, and the liquid injection process is completed. The present disclosure can greatly shorten the time consumed in liquid injection of the liquid cooling system, improve the liquid injection efficiency, and has a better effect of discharging air, which can effectively reduce the residual air in the pipeline.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage liquid cooling systems, and in particular to a rapid liquid injection method for energy storage liquid cooling systems and an energy storage liquid cooling system. Background Art

[0002] In energy storage power stations, battery cells release heat during charging and discharging, raising their surface temperature and requiring cooling. Currently, air cooling and liquid cooling are the two main cooling methods used. Liquid cooling, with its advantages of proximity to the heat source, rapid cooling, minimal temperature gradients, and low energy consumption, is becoming increasingly widespread. A liquid cooling system typically includes a liquid cooling unit, cooling pipes, and pumps. The cooling pipes connect to a cooling plate, which is positioned over the target battery cell. The pumps pump refrigerant into the cooling pipes, where it exchanges heat with the battery cell, cooling it. The refrigerant is then recycled through the cooling unit.

[0003] Before starting the liquid cooling system, the air in the liquid cooling pipeline needs to be exhausted. In the existing technology, conventional vacuuming is usually adopted. After most of the air in the pipeline is exhausted, refrigerant is injected into the pipeline. This injection method takes an average of about 60 minutes, resulting in low injection efficiency and general exhaust effect. A large amount of air will remain in the pipeline, affecting the stable circulation of the refrigerant. Summary of the Invention

[0004] To address the aforementioned problems of the prior art, the present invention aims to provide a method for rapidly injecting liquid into an energy storage liquid cooling system and an energy storage liquid cooling system. This method can significantly shorten the injection time of the liquid cooling system, improve injection efficiency, and achieve better air removal, effectively reducing residual air in the pipeline.

[0005] The present disclosure discloses a method for rapidly injecting liquid into an energy storage liquid cooling system, which is applied to the energy storage liquid cooling system. The energy storage liquid cooling system includes a pump, a refrigeration unit, a refrigeration pipeline, and an exhaust valve. The two ends of the refrigeration pipeline are respectively connected to the liquid outlet and liquid return end of the refrigeration unit to form a refrigeration circuit. The pump is connected to the refrigeration circuit for pumping refrigerant. The exhaust valve is provided on the refrigeration circuit. The method for rapidly injecting liquid into the energy storage liquid cooling system includes the following steps:

[0006] S01. Establishing a discharge pipeline connected to the end of the refrigeration circuit, wherein the end of the discharge pipeline is a discharge outlet;

[0007] S02, opening the exhaust valve, starting the pump, and pumping refrigerant into the refrigeration circuit through the pump;

[0008] S03, when refrigerant liquid appears at the discharge outlet, the pump component continues pumping liquid for a period of t and then shuts down the pump component to discharge the refrigerant liquid in the discharge pipeline;

[0009] S04: Start the pump to continue discharging the remaining gas in the refrigeration circuit until the internal pressure of the refrigeration circuit is adjusted to pressure P, and the injection process is completed.

[0010] Preferably, the discharge pipeline is arranged outside the refrigeration unit and is detachably connected to the liquid return end of the refrigeration unit.

[0011] Preferably, the discharge pipeline is arranged inside the refrigeration unit and is connected to the liquid return end of the refrigeration unit, and a discharge valve for controlling opening and closing is provided at the connection position.

[0012] Preferably, in step S02, the process of the pump member pumping the refrigerant into the refrigeration circuit includes a first period T1 and a second period T2, wherein the first period T1 is before the second period T2, the pumping flow rate of the pump member in the first period T1 is a first flow rate F1, and the pumping flow rate in the second period T2 is a second flow rate F2, and the first flow rate F1 and the second flow rate F2 are calculated according to the following formula:

[0013] F1=k1*(V1+V2) / g,

[0014] F2=k2*(V1+V2) / g;

[0015] Wherein, V1 represents the total volume of the refrigeration circuit, V2 represents the volume of the discharge pipeline, g represents the gas solubility of air in the refrigerant liquid in a static state, k1 and k2 represent the calculation coefficients of the first flow rate F1 and the second flow rate F2, respectively, satisfying k1>k2.

[0016] Preferably, in step S02, the first time period T1 and the second time period T2 are calculated according to the following formulas:

[0017] T1=(V2+Vc1) / F1;

[0018] T2=(V1+Vc2) / F2;

[0019] Here, Vc1 and Vc2 represent the first volume correction value and the second volume correction value, respectively.

[0020] Preferably, in step S03, the time period t during which the pump continues to pump liquid is calculated according to the following formula:

[0021] t=t0+k3*V1+k4*g;

[0022] Wherein, t0 represents the basic time value, k3 and k4 represent the calculation coefficients of the total volume of the refrigeration pipeline and the gas solubility, respectively, and both k3 and k4 are greater than 0.

[0023] Preferably, in step S04, the pressure P is equal to the normal operating pressure of the energy storage liquid cooling system.

[0024] The present disclosure discloses an energy storage liquid cooling system, comprising a pump, a refrigeration unit, a refrigeration pipeline, and an exhaust valve. The two ends of the refrigeration pipeline are respectively connected to the liquid outlet and liquid return end of the refrigeration unit to form a refrigeration circuit. The pump is connected to the refrigeration circuit for pumping refrigerant, and the exhaust valve is arranged on the refrigeration circuit. The energy storage liquid cooling system also includes a discharge pipeline connected to the end of the refrigeration circuit. The end of the discharge pipeline is a discharge port. The discharge pipeline is used to discharge air in the refrigeration circuit simultaneously with liquid injection.

[0025] During liquid injection, the exhaust valve is opened, the pump is started, and refrigerant is pumped into the refrigeration circuit through the pump. When refrigerant appears at the discharge port, the pump is allowed to continue pumping for a period of time t and then closed to discharge the refrigerant in the discharge pipeline. The pump is then started to continue discharging the remaining gas in the refrigeration circuit until the internal pressure of the refrigeration circuit is adjusted to pressure P, and the liquid injection process is completed.

[0026] Preferably, the energy storage liquid cooling system further includes a liquid sensor, which is arranged at the discharge port and is used to detect the refrigerant liquid.

[0027] The advantages of the disclosed method for rapidly injecting liquid into an energy storage liquid cooling system and the energy storage liquid cooling system are that, by providing a discharge pipeline, the air in the pipeline is squeezed out by the injected refrigerant during injection, and the air is expelled from the discharge pipeline. Continuous pumping of refrigerant can fully squeeze and expel the air in the pipeline. Since the disclosed method expels air while injecting liquid, the injection time can be significantly shortened, the injection efficiency is improved, and the air expulsion effect is better, which can effectively reduce residual air in the pipeline and improve the stability of the refrigerant circulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the energy storage liquid cooling system described in Example 1;

[0029] Figure 2 It is a structural diagram of the energy storage liquid cooling system described in Example 2.

[0030] Explanation of the reference numerals: 1-pump, 2-refrigeration unit, 21-liquid outlet, 22-liquid return, 3-refrigeration pipeline, 4-exhaust valve, 5-discharge pipeline, 6-liquid cooling plate, 7-discharge valve, 8-housing. DETAILED DESCRIPTION

[0031] The present disclosure discloses a method for rapidly injecting liquid into an energy storage liquid cooling system, which is applied to an energy storage liquid cooling system. The energy storage liquid cooling system includes a housing 8 and a pump 1, a refrigeration unit 2, a refrigeration pipeline 3, and an exhaust valve 4 disposed within the housing 8. The two ends of the refrigeration pipeline 3 are respectively connected to the liquid outlet 21 and the liquid return 22 of the refrigeration unit 2 to form a refrigeration circuit. The refrigeration circuit is connected to a liquid cooling plate 6, which is disposed at the battery cell for cooling the battery cell. The pump 1 is connected to the refrigeration circuit for pumping in refrigerant, and the exhaust valve 4 is disposed on the refrigeration circuit. The method for rapidly injecting liquid into an energy storage liquid cooling system includes the following steps:

[0032] S01, establishing a discharge pipeline 5 communicating with the end of the refrigeration circuit, wherein the end of the discharge pipeline 5 is a discharge outlet;

[0033] S02, opening the exhaust valve 4, starting the pump 1, and pumping refrigerant (usually water) into the refrigeration circuit through the pump 1;

[0034] S03, when refrigerant liquid appears at the discharge port, the pump 1 is operated to continuously pump liquid for a period of time t, and then the pump 1 is closed to discharge the refrigerant liquid in the discharge pipe 5;

[0035] S04: Start the pump 1 and continue to discharge the remaining gas in the refrigeration circuit until the internal pressure of the refrigeration circuit is adjusted to pressure P, and the injection process is completed.

[0036] Specifically, there are at least two implementations for disposing the discharge pipe 5:

[0037] Example 1

[0038] like Figure 1 As shown, the discharge line 5 is disposed outside the refrigeration unit 2 and is detachably connected to the liquid return end 22 of the refrigeration unit 2. For example, the end of the refrigeration line 3 is detachably connected to the liquid return end 22 of the refrigeration unit 2 via a quick connector. When the refrigeration line 3 is removed from the refrigeration unit 2, the liquid return end 22 can be exposed. The discharge line 5 is processed into an L-shape or an elongated strip, and a quick connector is installed at one end thereof, so that the refrigeration line 3 can be detachably connected to the liquid return end 22 via the quick connector. In other words, either the refrigeration line 3 or the discharge line 5 can be connected to the liquid return end 22.

[0039] For example, after all components are installed, close the ball valve on the return water pipe of the refrigeration unit 2, open the injection valve on the unit, open the exhaust valve 4, unplug the refrigeration line 3 at the return liquid end 22, connect the return liquid end 22 with the discharge line 5, and place the other end of the discharge line 5 into the floor drain to facilitate the outflow of liquid during the injection process. Start the pump 1, inject the refrigerant into the energy storage system, and observe whether there is liquid flowing out of the discharge port. After observing liquid flowing out, inject the liquid for about 1 minute, close the pump 1, disconnect the discharge line 5 from the refrigeration unit 2, remove the discharge line 5, drain the refrigerant in the discharge line 5, and then reconnect the discharge line 5 to the refrigeration unit 2. Continue to open the pump 1 until the pressure in the circuit reaches 1 bar, and exhaust the remaining gas in the circuit. At this time, close the pump 1, open the ball valve on the return water pipe of the refrigeration unit 2, close the injection valve on the unit, close the automatic exhaust valve 4, and the injection is complete.

[0040] Example 2

[0041] like Figure 2 As shown, the discharge line 5 is disposed within the refrigeration unit 2 and communicates with the liquid return port 22 of the refrigeration unit 2, forming a two-way structure between the discharge line 5 and the refrigerant line 3 at the liquid return port 22, allowing either one to be controlled to communicate with the liquid return port 22. A discharge valve 7 for controlling opening and closing is provided at the connection point between the discharge line 5 and the liquid return port 22. When the discharge valve 7 is open, refrigerant flowing into the liquid return port 22 flows further into the discharge line 5. The other end of the discharge line 5 communicates with the liquid outlet of the refrigeration unit 2, which is then connected to a floor drain via a pipeline.

[0042] For example, after all components are installed, close the ball valve on the return line of refrigeration unit 2, open the liquid injection valve on the unit, open the exhaust valve 4 and the discharge valve 7, and open the ball valve on the drain bypass line. Start pump 1 and inject coolant into the energy storage system. Observe the drain bypass outlet and wait for liquid to flow out. Continue to inject liquid for about 1 minute. Now open the ball valve on the return line of refrigeration unit 2 and close the ball valve on the bypass line. After observing that the system pressure reaches approximately 1 bar, close pump 1 and the liquid injection valve. At this point, the energy storage system is fully injected.

[0043] In the above two embodiments, both can discharge the gas in the pipeline 5 through the discharge pipeline 5 during liquid injection, and the setting can be selected according to actual needs.

[0044] The concept of the present invention is to use refrigerant (usually water) to squeeze the air in the pipeline during injection, expelling the air from the drain pipe. However, due to the small cross-sectional area of ​​the pipeline, the refrigerant flows faster in the pipeline. When the flow rate is faster, the gas solubility of the refrigerant increases, causing more air to mix into the refrigerant, which will affect the stability of the subsequent refrigerant circulation process and the cooling effect. On the other hand, if the refrigerant flow rate is controlled too slowly, the speed of air discharge will be affected, affecting the injection efficiency. Therefore, how to reasonably set the refrigerant flow rate (usually positively correlated with the flow rate) is a technical issue that needs to be considered in this embodiment.

[0045] Further considering the concept of the present invention, when exhaust is performed by liquid injection, the refrigerant injected first will flow to the discharge pipe 5 first. This part of the refrigerant will be discharged from the discharge pipe 5 and will not circulate in the subsequent liquid cooling system. Therefore, even if this part of the refrigerant dissolves a large amount of air, it will not affect the stability of the subsequent liquid cooling system. On the contrary, it can take away the air in the pipeline and speed up the exhaust speed.

[0046] Therefore, in step S02 of this embodiment, the process of the pump member 1 pumping the refrigerant into the refrigeration circuit includes a first period T1 and a second period T2, wherein the first period T1 is before the second period T2, the pumping flow rate of the pump member 1 in the first period T1 is a first flow rate F1, and the pumping flow rate in the second period T2 is a second flow rate F2, and the first flow rate F1 and the second flow rate F2 are calculated according to the following formula:

[0047] F1=k1*(V1+V2) / g,

[0048] F2=k2*(V1+V2) / g;

[0049] Wherein, V1 represents the total volume of the refrigeration circuit, V2 represents the volume of the discharge pipe 5, g represents the gas solubility of air in the refrigerant liquid in a static state, k1 and k2 represent the calculation coefficients of the first flow rate F1 and the second flow rate F2, respectively, satisfying k1>k2.

[0050] In this embodiment, the effect of flow rate on gas solubility is fully considered. During the first period T1, located at the front of the time, pump element 1 is directed to pump the refrigerant at a higher flow rate. During this period, a large amount of air will be mixed into the refrigerant, but this portion of refrigerant will be discharged during the subsequent filling and exhaust process, thus not affecting the liquid cooling system. During the second period T2, located at the back of the time, pump element 1 is directed to pump the refrigerant at a lower flow rate. During this period, the refrigerant flow rate is relatively gentle, making it less likely for a large amount of air to be mixed into the refrigerant. This portion of refrigerant can provide a stable and effective cooling effect when subsequently circulating in the liquid cooling system.

[0051] Furthermore, this embodiment also designs calculation formulas for the first flow rate F1 and the second flow rate F2. When the total volume V1 of the refrigeration circuit and the volume V2 of the discharge pipe 5 are large, it means that there is a large amount of air in the refrigeration circuit and the discharge pipe 5 that needs to be discharged. Considering the problem of liquid injection efficiency, it is necessary to appropriately increase the flow rate of the refrigerant pumped into the pump 1. Therefore, F1, F2 and the sum of V1+V2 are set to be proportional.

[0052] When the gas solubility of air in the refrigerant is high in a static state, the increase in flow rate will lead to a significant increase in gas solubility. At this time, if a large flow rate is maintained to pump into the refrigerant, a large amount of air will be mixed into the refrigerant, which is not conducive to the subsequent refrigeration cycle. Therefore, it is necessary to appropriately reduce the flow rate of the refrigerant.

[0053] Furthermore, in this embodiment, k1 and k2 are respectively used for calculation correction, which can be designed according to the total volume V1 of the refrigeration circuit, the volume V2 of the discharge pipeline 5, the gas solubility g of the refrigerant and relevant parameters of the pump 1, such as the maximum flow rate, thereby calculating the appropriate flow rates F1 and F2. For example, k1=1.5*k2.

[0054] In step S03, the first time period T1 and the second time period T2 are calculated according to the following formulas:

[0055] T1=(V2+Vc1) / F1;

[0056] T2=(V1+Vc2) / F2;

[0057] Here, Vc1 and Vc2 represent the first volume correction value and the second volume correction value, respectively.

[0058] After the first flow rate F1 and the second flow rate F2 are obtained by the above calculation, considering that from the start of the pump 1, the refrigerant flows into the refrigeration circuit, to the refrigerant flows out from the end of the discharge pipe 5, the actual amount of refrigerant pumped in is V1+V2. In order to fully discharge the air in the circuit, it is considered necessary to discharge refrigerant equivalent to the volume of the discharge pipe 5. Therefore, in this embodiment, the volume of the discharge pipe 5 is combined with the first flow rate F1 to calculate the first time period T1 using the first flow rate F1, and it is easy to obtain T1=V2 / F1. However, the above discussion is based on ideal conditions. In actual operation, considering the influence of many interference factors such as volume error, flow detection error, refrigerant waste, air dissolution, etc., the volume needs to be corrected. Therefore, in this embodiment, a first volume correction value Vc1 is introduced. The first volume correction value Vc1 can be obtained based on actual tests, aiming to make the calculation of the first time period T1 more accurate.

[0059] Similarly, the calculation formula for the second time period T2 is as above.

[0060] In step S03, the time period t during which the pump 1 continues pumping liquid is calculated according to the following formula:

[0061] t=t0+k3*V1+k4*g;

[0062] Wherein, t0 represents the basic time value, k3 and k4 represent the calculation coefficients of the total volume of the refrigeration pipeline and the gas solubility, respectively, and both k3 and k4 are greater than 0.

[0063] After the refrigerant is discharged from the discharge port of the discharge pipe 5, the pump 1 is made to continue pumping the liquid for a period of time t and then the pump 1 is stopped. During this process, the refrigerant will continue to be discharged from the discharge port. In order to avoid unnecessary waste of the refrigerant, the duration t needs to be reasonably set. In this embodiment, the design idea of ​​using the basic time value t0 superimposed on other influencing factors is considered. For example, the basic time value t0 is set to 50s. The basic time value t0 needs to ensure that the flow rate of the pumped refrigerant is roughly equal to the volume of the discharge pipe 5, which can be calculated based on the volume of the discharge pipe 5 and the flow rate of the pump 1.

[0064] Then, other influencing factors are comprehensively considered, such as the total volume of the refrigeration pipeline 3 and the gas solubility, and the time period t of the pump 1 continuously pumping liquid is obtained to reduce the waste of refrigerant. The larger the total volume of the refrigeration pipeline 3, the more air needs to be discharged from the pipeline, and since the refrigerant stroke is longer, the amount of air dissolved in the refrigerant is also greater. In order to ensure the subsequent refrigeration effect, it is necessary to extend the time period t of continuous pumping liquid, so the above-mentioned k3 is set to be greater than 0. Similarly, when the gas solubility of the refrigerant is greater, it means that the amount of air dissolved in the refrigerant during the flow process is more, and it is necessary to extend the time period t of continuous pumping liquid to discharge the refrigerant with a large amount of air from the liquid cooling system, so the above-mentioned k4 is set to be greater than 0. In a specific embodiment, since the liquid cooling system often uses water as the refrigerant, the above-mentioned k4 can be calculated as a constant.

[0065] In this step, the continuous pumping time of the pump 1 is reasonably set by considering the three influencing factors, so as to fully discharge the air in the pipeline and minimize unnecessary waste of refrigerant.

[0066] Furthermore, in this embodiment, in step S04, the pressure P is equal to the normal operating pressure of the energy storage liquid cooling system. When the internal pressure of the refrigeration circuit is equal to the normal operating pressure of the energy storage liquid cooling system, it means that most of the air in the circuit has been discharged and the liquid cooling system can operate normally.

[0067] This embodiment also provides an energy storage liquid cooling system, including a pump 1, a refrigeration unit 2, a refrigeration pipeline 3 and an exhaust valve 4. The two ends of the refrigeration pipeline 3 are respectively connected to the liquid outlet 21 and the liquid return end 22 of the refrigeration unit 2 to form a refrigeration circuit. The pump 1 is connected to the refrigeration circuit for pumping in refrigerant, and the exhaust valve 4 is arranged on the refrigeration circuit; the energy storage liquid cooling system also includes a discharge pipeline 5 connected to the end of the refrigeration circuit, the end of the discharge pipeline 5 is a discharge port, and the discharge pipeline 5 is used to synchronously discharge the air in the refrigeration circuit during liquid injection.

[0068] The energy storage liquid cooling system of this embodiment and the aforementioned energy storage liquid cooling system rapid liquid injection method belong to the same inventive concept, which can be understood with reference to the above description and will not be repeated here.

[0069] Furthermore, in this embodiment, the energy storage liquid cooling system also includes a liquid sensor, which is arranged at the discharge port and is used to detect the refrigerant liquid. The refrigerant liquid at the discharge port can be detected by the liquid sensor without manual observation, and the degree of automation and intelligence is higher.

[0070] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure.

[0071] Those skilled in the art can make various other corresponding changes and deformations based on the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of this disclosure.

Claims

1. A method for rapidly injecting liquid into an energy storage liquid cooling system, applied to the energy storage liquid cooling system, wherein the energy storage liquid cooling system comprises a pump, a refrigeration unit, a refrigeration pipeline, and an exhaust valve, wherein the two ends of the refrigeration pipeline are respectively connected to the liquid outlet and the liquid return end of the refrigeration unit to form a refrigeration circuit, the pump is connected to the refrigeration circuit for pumping refrigerant, and the exhaust valve is arranged on the refrigeration circuit; characterized in that: The method for rapid liquid injection of an energy storage liquid cooling system comprises the following steps: S01. Establishing a discharge pipeline connected to the end of the refrigeration circuit, wherein the end of the discharge pipeline is a discharge outlet; S02, opening the exhaust valve, starting the pump component, and pumping refrigerant into the refrigeration circuit through the pump component; S03, when refrigerant liquid appears at the discharge outlet, the pump component continues pumping liquid for a period of time t and then shuts down the pump component to discharge the refrigerant liquid in the discharge pipeline; S04: Start the pump to continue discharging the remaining gas in the refrigeration circuit until the internal pressure of the refrigeration circuit is adjusted to pressure P, and the injection process is completed.

2. The rapid liquid injection method for the energy storage liquid cooling system according to claim 1, characterized in that: The discharge pipeline is arranged outside the refrigeration unit and is detachably connected to the liquid return end of the refrigeration unit.

3. The rapid liquid injection method for the energy storage liquid cooling system according to claim 1, characterized in that: The discharge pipeline is arranged inside the refrigeration unit and is connected to the liquid return end of the refrigeration unit. A discharge valve for controlling opening and closing is provided at the connection position.

4. The method for rapid liquid injection of an energy storage liquid cooling system according to claim 1, 2 or 3, characterized in that: In step S02, the process of the pump member pumping the refrigerant into the refrigeration circuit includes a first period T1 and a second period T2, wherein the first period T1 is before the second period T2, the pumping flow rate of the pump member in the first period T1 is a first flow rate F1, and the pumping flow rate in the second period T2 is a second flow rate F2, and the first flow rate F1 and the second flow rate F2 are calculated according to the following formula: F1=k1*(V1+V2) / g, F2=k2*(V1+V2) / g; Wherein, V1 represents the total volume of the refrigeration circuit, V2 represents the volume of the discharge pipeline, g represents the gas solubility of air in the refrigerant liquid in a static state, k1 and k2 represent the calculation coefficients of the first flow rate F1 and the second flow rate F2, respectively, satisfying k1>k2.

5. The rapid liquid injection method for the energy storage liquid cooling system according to claim 4, characterized in that: In step S02, the first time period T1 and the second time period T2 are calculated according to the following formulas: T1=(V2+Vc1) / F1; T2=(V1+Vc2) / F2; Here, Vc1 and Vc2 represent the first volume correction value and the second volume correction value, respectively.

6. The rapid liquid injection method for the energy storage liquid cooling system according to claim 5, characterized in that: In step S03, the time period t during which the pump continues to pump liquid is calculated according to the following formula: t=t0+k3*V1+k4*g; Wherein, t0 represents the basic time value, k3 and k4 represent the calculation coefficients of the total volume of the refrigeration pipeline and the gas solubility, respectively, and both k3 and k4 are greater than 0.

7. The rapid liquid injection method for an energy storage liquid cooling system according to claim 6, characterized in that: In step S04, the pressure P is equal to the normal operating pressure of the energy storage liquid cooling system.

8. An energy storage liquid cooling system, comprising a pump, a refrigeration unit, a refrigeration pipeline, and an exhaust valve, wherein the two ends of the refrigeration pipeline are respectively connected to the liquid outlet and liquid return end of the refrigeration unit to form a refrigeration circuit, the pump is connected to the refrigeration circuit for pumping refrigerant, and the exhaust valve is arranged on the refrigeration circuit; characterized in that: The energy storage liquid cooling system further includes a discharge pipeline connected to the end of the refrigeration circuit, the end of the discharge pipeline is a discharge port, and the discharge pipeline is used to discharge air in the refrigeration circuit simultaneously during liquid injection; During liquid injection, the exhaust valve is opened, the pump is started, and refrigerant is pumped into the refrigeration circuit through the pump. When refrigerant appears at the discharge port, the pump is allowed to continue pumping for a period of time t and then closed to discharge the refrigerant in the discharge pipeline. The pump is then started to continue discharging the remaining gas in the refrigeration circuit until the internal pressure of the refrigeration circuit is adjusted to pressure P, and the liquid injection process is completed.

9. The energy storage liquid cooling system according to claim 8, characterized in that: It also includes a liquid sensor, which is arranged at the discharge port and is used to detect the refrigerant.

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