A gas make-up control method for an energy storage thermal management system

Abstract

The application relates to the technical field of energy storage thermal management and discloses a gas supplement control method for an energy storage thermal management system, wherein the energy storage thermal management system comprises a compressor and an auxiliary throttle valve, the method comprises the following steps: determining the exhaust gas superheat degree and the suction gas superheat degree of the compressor; and adjusting the auxiliary throttle valve according to the exhaust gas superheat degree and the suction gas superheat degree. The method for adjusting the auxiliary throttle valve according to the suction gas superheat degree and the exhaust gas superheat degree of the compressor can optimize the control idea of the compressor and prolong the service life of the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage thermal management in general. In particular, the present application relates to a method for gas supplement control of an energy storage thermal management system. BACKGROUND

[0002] Thermal management is a must for electrochemical energy storage, which has a significant impact on the performance, life, and safety of the energy storage system. Among them, the heat exchange capacity of the liquid cooling thermal management system is strong, and the temperature difference of the battery can be within 3℃, which can significantly improve the life of the energy storage system compared with the air cooling thermal management system. The refrigeration capacity required by the current liquid cooling thermal management system is usually 100kW or less. The compressor used in such a small refrigeration cycle is usually a scroll compressor. However, scroll compressors need to use oil circulation, which will reduce the reliability of the compressor and the liquid cooling thermal management system. In addition, the bearings of scroll compressors are usually contact type ball bearings, which are prone to wear and tear, and their service life is usually the bottleneck of the service life of the liquid cooling thermal management system. In addition, the volume and mass of scroll compressors are usually larger, which is not conducive to improving the energy density of the energy storage system, especially as the power density of the energy storage system increases and the refrigeration capacity demand increases significantly, the disadvantages of scroll compressors will be more pronounced. SUMMARY

[0003] To at least partially solve the above problems in the prior art, the first aspect of the present application proposes an energy storage thermal management system, in which a high-speed gas bearing centrifugal compressor replaces a scroll compressor to realize the refrigeration cycle of the energy storage liquid cooling system.

[0004] The centrifugal compressor does not need to use oil lubrication because it uses a gas bearing, so it eliminates the oil return pipeline, improving the reliability of the compressor and the system. In addition, the gas bearing does not contact the shaft during operation, but relies on the gas film to suspend the motor rotor, which can at least double the service life of the bearing compared to traditional contact type ball bearings. In addition, under the same cooling capacity, the size and weight of the centrifugal compressor based on a high-speed permanent magnet synchronous motor are about 40% smaller than those of a traditional scroll compressor, which can reduce the volume of the liquid cooling thermal management system. In other words, more batteries can be arranged in the same size container, which helps to improve the energy density of the energy storage system. As the refrigeration power demand of the energy storage system increases, the advantages of high-speed centrifugal compressors will be more pronounced.

[0005] The second aspect of the present application proposes a gas supplement control method for the above-mentioned energy storage thermal management system using a centrifugal compressor, which includes the following steps:

[0006] determining the exhaust gas superheat degree and the suction gas superheat degree of the compressor; and

[0007] adjusting the auxiliary throttle valve according to the exhaust gas superheat degree and the suction gas superheat degree.

[0008] In one embodiment of the present application, an exhaust temperature sensor and an exhaust pressure sensor are provided at the outlet of the compressor, and the exhaust superheat is calculated based on the measured values of the exhaust temperature sensor and the exhaust pressure sensor, and is expressed as follows: exhaust superheat = T exhaust temperature - T saturated temperature corresponding to high pressure; and

[0009] An intake temperature sensor and an intake pressure sensor are provided at the inlet of the compressor, and the intake superheat is calculated based on the measured values of the intake temperature sensor and the intake pressure sensor, and is expressed as follows: intake superheat = T intake temperature - T saturated temperature corresponding to low pressure.

[0010] In one embodiment of the present application, the air supplement control method for the energy storage thermal management system includes normal control, which includes:

[0011] The initial opening of the auxiliary throttle valve is set according to the frequency of the compressor, and the auxiliary throttle valve is adjusted.

[0012] In one embodiment of the present application,

[0013] When the frequency of the compressor is 20-50 RPS, the initial opening of the auxiliary throttle valve is set to 80P, and the adjustment of the auxiliary throttle valve includes:

[0014] When the exhaust superheat < 5K, the valve is prohibited to open;

[0015] When 5K ≤ exhaust superheat ≤ 10K, the auxiliary throttle valve is adjusted with a target of 5K of the exhaust superheat;

[0016] When 10K < exhaust superheat < 15K, the auxiliary throttle valve is adjusted with a target of 4K of the exhaust superheat;

[0017] When 15K ≤ exhaust superheat < 20K, the auxiliary throttle valve is adjusted with a target of 4K of the exhaust superheat; and

[0018] When the exhaust superheat > 20K or the exhaust temperature ≥ 100℃, the auxiliary throttle valve is adjusted with a target of 1K of the exhaust superheat for cooling;

[0019] When the frequency of the compressor is 50-70 RPS, the initial opening of the auxiliary throttle valve is set to 150P, and the adjustment of the auxiliary throttle valve includes:

[0020] When the exhaust superheat < 5K, the valve is prohibited to open;

[0021] When 5K ≤ exhaust superheat ≤ 10K, the auxiliary throttle valve is adjusted with a target of 5K of the exhaust superheat;

[0022] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0023] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0024] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0025] when the compressor frequency is 70-90 RPS, the initial opening of the auxiliary throttle valve is set to 250P, wherein adjusting the auxiliary throttle valve comprises:

[0026] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0027] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0028] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0029] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0030] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0031] when the compressor frequency is 90-120 RPS, the initial opening of the auxiliary throttle valve is set to 300P, wherein adjusting the auxiliary throttle valve comprises:

[0032] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0033] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0034] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0035] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K; and

[0036] when the exhaust gas superheat is > 20K or the exhaust gas temperature is > 100°C, the auxiliary throttle valve is adjusted to target a jet gas superheat of 1K.

[0037] In one embodiment of the present application, a temperature sensor and a pressure sensor are arranged at the air injection inlet of the compressor, and the air injection superheat of the compressor is calculated according to the measured values of the temperature sensor and the pressure sensor.

[0038] In one embodiment of the present application, the air injection control method for the energy storage thermal management system comprises protection control, which comprises:

[0039] When the suction superheat is ≥10K, the auxiliary throttle valve is adjusted at a set opening, and the maximum opening is 480P;

[0040] When 5K

[0041] When 3K≤suction superheat≤5K, the auxiliary throttle valve is prohibited from opening, and the maximum opening is 200P, wherein when the opening is <200P, the current opening is maintained, and when the opening is >200P, the opening is closed to 200P;

[0042] When the suction superheat is <3K, the closing rate of the auxiliary throttle valve is 2P / S, and the maximum opening is 100P, wherein when the suction superheat is still <3K within 30S of counting, the minimum opening is adjusted to 60P, and when the suction superheat is still <3K within 60S of counting, the opening of the auxiliary throttle valve is closed.

[0043] In one embodiment of the present application, the protection control is prior to the normal control.

[0044] The second aspect of the present application has at least the following beneficial effects: the method of adjusting the auxiliary throttle valve according to the suction and exhaust superheats of the compressor can optimize the control idea of the compressor, and prolong the service life of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0045] To further clarify the advantages and features of the embodiments of the present application, a more particular description of the embodiments of the present application will be presented with reference to the accompanying drawings. It can be understood that these drawings only depict typical embodiments of the present application, and therefore should not be considered as limiting its scope. In the drawings, the same or similar components will be denoted by the same or similar reference signs for the sake of clarity and intelligibility.

[0046] Figure 1 A schematic diagram of a framework of an energy storage thermal management system in one embodiment of the present application is shown.

[0047] Figure 2 A flowchart of an air injection control method for an energy storage thermal management system in one embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] It should be noted that the components in the various figures can be shown exaggerated in scale for illustrative purposes and can not necessarily be to scale. In the various figures, identical or functionally similar components are designated with the same reference numerals.

[0049] In the present disclosure, unless specifically indicated, "arranged on", "arranged above", and "arranged over" do not exclude the presence of an intermediate object between the two. In addition, "arranged on or above" only indicates the relative positional relationship between the two components, and in certain cases, such as after reversing the product direction, it can also be converted to "arranged below or below", and vice versa.

[0050] In the present disclosure, each embodiment is only intended to illustrate the scheme of the present disclosure and should not be understood as limiting.

[0051] In the present disclosure, unless specifically indicated, the quantifier "one", "a" does not exclude the scenario of multiple elements.

[0052] It should also be noted here that in the embodiments of the present disclosure, only a part of the components or assemblies can be shown for clarity and simplicity, but those skilled in the art can understand that under the guidance of the present disclosure, the required components or assemblies can be added according to the specific scene needs. In addition, unless otherwise stated, the features in different embodiments of the present disclosure can be combined with each other. For example, a feature in the second embodiment can replace a corresponding or functionally similar feature in the first embodiment, and the resulting embodiment also falls within the scope or range of the disclosure of the present application.

[0053] It should also be noted here that within the scope of the present disclosure, the words "same", "equal", "equal" and the like do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the words also cover "substantially the same", "substantially equal", "substantially equal". By analogy, in the present disclosure, the terms "perpendicular to", "parallel to" and the like also cover the meanings of "substantially perpendicular to", "substantially parallel to".

[0054] In addition, the numbering of the steps of each method of the present disclosure does not limit the execution order of the method steps. Unless specifically indicated, each method step can be executed in a different order.

[0055] The present disclosure will be further described below with reference to the specific embodiments in conjunction with the accompanying drawings.

[0056] Figure 1 A schematic diagram of the framework of an energy storage thermal management system in one embodiment of the present disclosure is shown. The system can include a refrigeration circuit and a coolant circuit, such as Figure 1As shown, wherein the refrigerant circuit can include compressor 1, condenser 4, bypass valve, main throttle valve 8, auxiliary throttle valve 7, evaporator 9, economizer 6, temperature sensor and pressure sensor, the cooling liquid circuit can include evaporator 9, water pump 16, battery pack heat source 17, temperature sensor and pressure sensor.

[0057] The outlet of the compressor 1 is connected with the inlet of the condenser 4, and an exhaust temperature sensor 2 and an exhaust pressure sensor 3 are arranged at the outlet of the compressor 1.

[0058] The outlet of the condenser 4 is connected with the main path inlet of the economizer 5, and a fan 5 is arranged at the condenser 4.

[0059] The main path outlet of the economizer 6 is connected with the inlet of the main throttle valve 8, the outlet of the main throttle valve 8 is connected with the inlet of the refrigerant path of the evaporator 9, and the outlet of the refrigerant path of the evaporator 9 is connected with the inlet of the compressor 1. An suction pressure sensor 10 and a suction temperature sensor 11 are arranged at the inlet of the compressor 1. A main path temperature sensor 14 and a main path pressure sensor 15 are arranged at the inlet of the refrigerant path of the evaporator 9.

[0060] The inlet of the auxiliary throttle valve 7 is connected with the connecting pipeline at the inlet of the main throttle valve 8, the outlet of the auxiliary throttle valve 7 is connected with the auxiliary path inlet of the economizer 6, and the auxiliary path outlet of the economizer 6 is connected with the supplement gas inlet of the compressor 1. A supplement gas temperature sensor 12 and a supplement gas pressure sensor 13 are arranged at the supplement gas inlet of the compressor 1.

[0061] The outlet of the water pump 16 is connected with the cooling liquid side inlet of the evaporator 9, the cooling liquid side outlet of the evaporator 9 is connected with the inlet of the battery pack heat source 17, and the outlet of the battery pack heat source 17 is connected with the inlet of the water pump 16. A water path outlet water temperature sensor 18 and a water path outlet water pressure sensor 19 are arranged at the cooling liquid side outlet of the evaporator 9.

[0062] In the working process of the energy storage thermal management system, the refrigerant in the refrigerant circuit is discharged from the compressor 1 in the form of high-temperature and high-pressure gas, condensed by the condenser 4 to form high-temperature and high-pressure liquid, formed into low-temperature and low-pressure liquid by the main throttle valve 8, and formed into low-temperature and low-pressure gas by the evaporator 9 to return to the compressor 1.

[0063] The auxiliary throttle valve 7 cooperates with the economizer 6 to form a supplement gas path, in which the low-temperature and low-pressure liquid after the economizer 6 is evaporated by the economizer 6 to form low-temperature and low-pressure gas and is discharged into the supplement gas side of the compressor 1.

[0064] The cooling liquid in the cooling liquid circuit exchanges heat with the refrigerant in the evaporator 9 and flows to the battery pack heat source 17 to be cooled and radiated, and after the radiation is completed, the cooling liquid flows into the evaporator 9 to be cooled and radiated.

[0065] Figure 2 A flowchart of a method for air supplement control of an energy storage thermal management system is shown in an embodiment of the present application. As shown in Figure 2 The method can include the following steps:

[0066] Step 201: Determine the exhaust gas superheat and the suction gas superheat of the compressor 1.

[0067] Step 202: Adjust the auxiliary throttle valve 7 according to the exhaust gas superheat and the suction gas superheat.

[0068] The method will be described in detail below in combination with specific embodiments.

[0069] The exhaust gas superheat of the compressor 1 can be calculated according to the measurement values of the exhaust gas temperature sensor 2 and the exhaust gas pressure sensor 3: T exhaust gas - T saturated temperature corresponding to high pressure.

[0070] The suction gas superheat of the compressor 1 can be calculated according to the measurement values of the suction gas pressure sensor 10 and the suction gas temperature sensor 11: T suction gas - T saturated temperature corresponding to low pressure.

[0071] The injection gas superheat of the compressor 1 can be calculated according to the measurement values of the injection gas temperature sensor 12 and the injection gas pressure sensor 13: T injection gas - T saturated temperature corresponding to injection gas pressure.

[0072] The initial opening of the auxiliary throttle valve 7 is set according to the frequency of the compressor 1. And after the energy storage thermal management system unit completes the start-up platform or the compressor 1 continuously starts to run for 3 minutes, that is, after the energy storage thermal management system can continuously and stably run, the auxiliary throttle valve 7 is further adjusted.

[0073] The adjustment mode of the auxiliary throttle valve 7 will be described in detail below for different frequencies of the compressor 1.

[0074] When the frequency of the compressor 1 is 20-50RPS, the initial opening of the auxiliary throttle valve 7 is set to 80P, and the adjustment of the auxiliary throttle valve 7 includes:

[0075] When the exhaust gas superheat is <5K, the valve is prohibited to open;

[0076] When 5K≤exhaust gas superheat≤10K, the auxiliary throttle valve 7 is adjusted with the injection gas superheat 5K as the target;

[0077] When 10K < exhaust gas superheat < 15K, the auxiliary throttle valve 7 is adjusted with a target of 4K of jet gas superheat;

[0078] When 15K < exhaust gas superheat < 20K, the auxiliary throttle valve 7 is adjusted with a target of 4K of jet gas superheat; and

[0079] When the exhaust gas superheat > 20K or the exhaust gas temperature > 100℃, the auxiliary throttle valve 7 is adjusted with a target of 1K of jet gas superheat for temperature reduction.

[0080] When the frequency of the compressor 1 is 50-70RPS, the initial opening of the auxiliary throttle valve 7 is set to 150P, and the adjustment of the auxiliary throttle valve 7 includes:

[0081] When the exhaust gas superheat < 5K, the valve is prohibited from opening;

[0082] When 5K < exhaust gas superheat < 10K, the auxiliary throttle valve 7 is adjusted with a target of 5K of jet gas superheat;

[0083] When 10K < exhaust gas superheat < 15K, the auxiliary throttle valve 7 is adjusted with a target of 4K of jet gas superheat;

[0084] When 15K < exhaust gas superheat < 20K, the auxiliary throttle valve 7 is adjusted with a target of 4K of jet gas superheat; and

[0085] When the exhaust gas superheat > 20K or the exhaust gas temperature > 100℃, the auxiliary throttle valve 7 is adjusted with a target of 1K of jet gas superheat for temperature reduction.

[0086] When the frequency of the compressor 1 is 70-90RPS, the initial opening of the auxiliary throttle valve 7 is set to 250P, and the adjustment of the auxiliary throttle valve 7 includes:

[0087] When the exhaust gas superheat < 6K, the valve is prohibited from opening;

[0088] When 6K < exhaust gas superheat < 10K, the auxiliary throttle valve 7 is adjusted with a target of 5K of jet gas superheat;

[0089] When 10K < exhaust gas superheat < 15K, the auxiliary throttle valve 7 is adjusted with a target of 4K of jet gas superheat;

[0090] When 15K < exhaust gas superheat < 20K, the auxiliary throttle valve 7 is adjusted with a target of 4K of jet gas superheat; and

[0091] When the exhaust gas superheat > 20K or the exhaust gas temperature > 100℃, the auxiliary throttle valve 7 is adjusted with a target of 1K of jet gas superheat for temperature reduction.

[0092] When the frequency of the compressor 1 is 90-120 RPS, the initial opening of the auxiliary throttle valve 7 is set to 300P, and the adjustment of the auxiliary throttle valve 7 includes:

[0093] When the exhaust gas superheat is <8K, the opening of the valve is prohibited;

[0094] When 8K≤exhaust gas superheat≤10K, the auxiliary throttle valve 7 is adjusted with a jet gas superheat of 5K as the target;

[0095] When 10K<exhaust gas superheat<15K, the auxiliary throttle valve 7 is adjusted with a jet gas superheat of 4K as the target;

[0096] When 15K≤exhaust gas superheat<20K, the auxiliary throttle valve 7 is adjusted with a jet gas superheat of 4K as the target; and

[0097] When the exhaust gas superheat>20K or the exhaust gas temperature≥100℃, the auxiliary throttle valve 7 is adjusted with a jet gas superheat of 1K as the target to reduce the temperature.

[0098] Further, protection control can also be performed based on the return gas superheat (suction gas superheat) of the energy storage thermal management system, including:

[0099] When the return gas superheat≥10K, the auxiliary throttle valve 7 is adjusted according to the set opening, and the maximum opening is 480P;

[0100] When 5K<return gas superheat<10K, the opening action rate of the auxiliary throttle valve 7 is limited to 4P / S, and the maximum opening is 300P;

[0101] When 3K≤return gas superheat≤5K, the opening of the auxiliary throttle valve 7 is prohibited, and the maximum opening is 200P, wherein when the opening is <200P, the current opening is maintained, and when the opening is >200P, it is closed to 200P;

[0102] When the return gas superheat<3K, the closing rate of the auxiliary throttle valve 7 is 2P / S, and the maximum opening is 100P, wherein when the return gas superheat is still <3K within 30S of counting, the minimum opening is adjusted to 60P (if the current opening is >100P, it is immediately adjusted to 100P, and if the current opening is <100P, it is maintained), and when it is still <3K within 60S of cumulative counting, the opening of the current auxiliary throttle valve 7 is closed.

[0103] The priority of the protection control is higher than that of the normal control, that is, when the return gas superheat is too low in the normal control of the auxiliary valve, the control mode of the protection control should be used preferentially.

[0104] The method of adjusting the auxiliary throttle valve according to the suction and discharge superheat degrees of the compressor can optimize the control idea of the compressor and prolong the service life of the compressor.

[0105] While the foregoing describes a number of embodiments of the application, it is understood that they have been presented by way of example only, and are not intended to limit the scope of the application. Obviously, various modifications and changes are possible in the light of the above teachings without departing from the spirit and scope of the application. Therefore, the breadth and scope of the application should not be limited by any of the above described exemplary embodiments, but should be defined in accordance with the following claims and their equivalents.

Claims

1. A method for gas supply control in an energy storage thermal management system, the energy storage thermal management system comprising a compressor and an auxiliary throttle valve, characterized in that, The method includes: Determine the discharge superheat and suction superheat of the compressor; and Adjust the auxiliary throttle valve according to the exhaust superheat and the intake superheat; This method includes performing normal controls, including: The initial opening of the auxiliary throttle valve is set according to the compressor frequency, and the auxiliary throttle valve is adjusted accordingly. This method includes protection controls, including: When the intake superheat is ≥10K, the auxiliary throttle valve is adjusted according to the set opening degree, with a maximum opening degree of 480P; When 5K < intake superheat < 10K, the opening rate of the auxiliary throttle valve is limited to 4P / S, and the maximum opening degree is 300P; When 3K≤suction superheat≤5K, the auxiliary throttle valve is prohibited from opening, and the maximum opening is 200P. When the opening is <200P, the current opening is maintained, and when the opening is >200P, it is closed to 200P. When the intake superheat is <3K, the closing rate of the auxiliary throttle valve is 2P / S, and the maximum opening is 100P. When the intake superheat is still <3K within 30 seconds of timing, the minimum opening is adjusted to 60P. When the cumulative timing is still <3K within 60 seconds, the opening of the auxiliary throttle valve is closed. The protection control takes precedence over the normal control.

2. The gas replenishment control method for an energy storage thermal management system according to claim 1, characterized in that, An exhaust temperature sensor and an exhaust pressure sensor are installed at the outlet of the compressor. The exhaust superheat is calculated based on the measurements from the exhaust temperature sensor and the exhaust pressure sensor, expressed as: Exhaust Superheat = T_Exhaust Temperature - T_Saturation Temperature Corresponding to High Pressure; and A suction pressure sensor and a suction temperature sensor are installed at the inlet of the compressor. The suction superheat is calculated based on the measured values ​​of the suction pressure sensor and the suction temperature sensor, and is expressed as follows: Suction superheat = T_suction temperature - T_saturation temperature corresponding to low pressure.

3. The gas replenishment control method for an energy storage thermal management system according to claim 1, characterized in that, When the compressor frequency is 20-50 RPS, the initial opening of the auxiliary throttle valve is set to 80P, wherein adjusting the auxiliary throttle valve includes: Do not open the valve when the exhaust superheat is less than 5K; When 5K Exhaust superheat At 10K, the auxiliary throttle valve is adjusted with a target jet superheat of 5K; When 10K < exhaust superheat < 15K, the auxiliary throttle valve is adjusted with a jet superheat of 4K as the target. When 15K When the exhaust superheat is <20K, the auxiliary throttle valve is adjusted to target an exhaust superheat of 4K; and When the exhaust superheat is >20K or the exhaust temperature At 100°C, the auxiliary throttle valve is adjusted to cool down with a jet superheat of 1K as the target. When the compressor frequency is 50-70 RPS, the initial opening of the auxiliary throttle valve is set to 150 P, wherein adjusting the auxiliary throttle valve includes: Do not open the valve when the exhaust superheat is less than 5K; When 5K Exhaust superheat At 10K, the auxiliary throttle valve is adjusted with a target jet superheat of 5K; When 10K < exhaust superheat < 15K, the auxiliary throttle valve is adjusted with a jet superheat of 4K as the target. When 15K When the exhaust superheat is <20K, the auxiliary throttle valve is adjusted to target an exhaust superheat of 4K; and When the exhaust superheat is >20K or the exhaust temperature At 100°C, the auxiliary throttle valve is adjusted to cool down with a jet superheat of 1K as the target. When the compressor frequency is 70-90 RPS, the initial opening of the auxiliary throttle valve is set to 250 P, wherein adjusting the auxiliary throttle valve includes: Do not open the valve when the exhaust superheat is less than 6K; When 6K Exhaust superheat At 10K, the auxiliary throttle valve is adjusted with a target jet superheat of 5K; When 10K < exhaust superheat < 15K, the auxiliary throttle valve is adjusted with a jet superheat of 4K as the target. When 15K When the exhaust superheat is <20K, the auxiliary throttle valve is adjusted to target an exhaust superheat of 4K; and When the exhaust superheat is >20K or the exhaust temperature At 100°C, the auxiliary throttle valve regulates cooling with a target jet superheat of 1K; and When the compressor frequency is 90-120 RPS, the initial opening of the auxiliary throttle valve is set to 300P. The adjustment of the auxiliary throttle valve includes: Do not open the valve when the exhaust superheat is less than 8K; When 8K Exhaust superheat At 10K, the auxiliary throttle valve is adjusted with a target jet superheat of 5K; When 10K < exhaust superheat < 15K, the auxiliary throttle valve is adjusted with a jet superheat of 4K as the target. When 15K When the exhaust superheat is <20K, the auxiliary throttle valve is adjusted to target an exhaust superheat of 4K; and When the exhaust superheat is >20K or the exhaust temperature is ≥100°C, the auxiliary throttle valve adjusts the temperature to target an exhaust superheat of 1K.

4. The gas replenishment control method for an energy storage thermal management system according to claim 3, characterized in that, The compressor is equipped with a gas supply temperature sensor and a gas supply pressure sensor at the gas supply inlet. The superheat of the compressor's jet is calculated based on the measurements from the gas supply temperature sensor and the gas supply pressure sensor: T_jet temperature - T_saturation temperature corresponding to the jet pipe pressure.

5. An energy storage thermal management system, characterized in that, include: compressor; as well as An auxiliary throttle valve is used to determine the discharge superheat and suction superheat of the compressor and to adjust the auxiliary throttle valve according to the discharge superheat and suction superheat, and to perform normal control and protection control. Normal control includes: The initial opening of the auxiliary throttle valve is set according to the compressor frequency, and the auxiliary throttle valve is adjusted accordingly. The protection and control measures include: When the intake superheat is ≥10K, the auxiliary throttle valve is adjusted according to the set opening degree, with a maximum opening degree of 480P; When 5K < intake superheat < 10K, the opening rate of the auxiliary throttle valve is limited to 4P / S, and the maximum opening degree is 300P; When 3K≤suction superheat≤5K, the auxiliary throttle valve is prohibited from opening, and the maximum opening is 200P. When the opening is <200P, the current opening is maintained, and when the opening is >200P, it is closed to 200P. When the intake superheat is <3K, the closing rate of the auxiliary throttle valve is 2P / S, and the maximum opening is 100P. When the intake superheat is still <3K within 30 seconds of timing, the minimum opening is adjusted to 60P. When the cumulative timing is still <3K within 60 seconds, the opening of the auxiliary throttle valve is closed. The protection control takes precedence over the normal control.

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