Low-power-consumption thermal management control method for cold power energy storage system

Abstract

The invention provides a low-power-consumption heat management control method for a cold electric power energy storage system. An air conditioner comprises a compressor, an evaporator, a condenser and an expansion valve. The working modes of the air conditioner comprise a shutdown mode, a refrigeration mode, a heating mode, an air supply mode and a standby mode, the system state is judged through a heat management control method of the battery management system, a heat management control signal is sent, and the working mode of the air conditioner is requested; the external environment temperature is distinguished, whether the current air-cooled energy storage system is in the high-temperature environment or the low-temperature environment is judged, if the current air-cooled energy storage system is in the low-temperature environment, the heat management control method in the low-temperature environment is executed, and otherwise, the heat management control method in the high-temperature environment is executed. By distinguishing whether the air-cooled energy storage system is in the charging and discharging state or the standing state, the air supply mode control method of the air conditioner in different working states is adjusted, the temperature difference between the single battery cells is reduced, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present application relates to the field of lithium battery energy storage containers, and in particular to a low-power thermal management control method for a cold power storage system. Background Art

[0002] The application environment of existing electric energy storage systems is relatively complex, and there are working conditions in extremely cold, extremely hot and normal temperature environments. In order to keep the internal battery cells, high-voltage devices, fire-fighting devices, etc. of the energy storage system in the best working conditions, the energy storage system is usually equipped with thermal management equipment (air conditioning / liquid cooling unit) to cool or heat the battery cells, ensuring a more stable and good operation of the lithium battery electric energy storage system. However, the power consumption of thermal management equipment (air conditioning / liquid cooling unit) during operation is very large, accounting for about 90% of the auxiliary power consumption on the DC side of the entire electric energy storage system. The main reason is that the thermal management control method is not effective, causing the thermal management equipment to be continuously in the working power consumption mode. Therefore, improving the energy efficiency of thermal management equipment and optimizing thermal management control methods have become key issues in the field of electric energy storage. Summary of the invention

[0003] The present application proposes a low-power thermal management control method for a cold power storage system, aiming to solve the problems of the above-mentioned background technology.

[0004] The present application proposes a low-power thermal management control method for a cold power storage system, including: an air conditioner includes a compressor, an evaporator, a condenser, and an expansion valve; the working modes of the air conditioner include a shutdown mode, a cooling mode, a heating mode, an air supply mode, and a standby mode, and a thermal management control method of a battery management system determines the system state, sends a thermal management control signal, and requests the working mode of the air conditioner;

[0005] The thermal management control method specifically includes:

[0006] Determine whether the ambient temperature is ≥10°C and the battery is in a charge and discharge state. If so, execute the thermal management control method for high ambient temperature and charge and discharge state.

[0007] Determine whether the ambient temperature is ≥10°C and the battery is in a static state. If so, execute the thermal management control method for high ambient temperature and static state;

[0008] Determine whether the ambient temperature is less than 10°C and the battery is in a charge and discharge state. If so, execute the thermal management control method for low ambient temperature and charge and discharge state.

[0009] Determine whether the ambient temperature is less than 10°C and the battery is in a static state. If so, execute the thermal management control method for low ambient temperature and static state.

[0010] Determine whether the air conditioning fault level, BMS fault level, heating or cooling fault are met. If so, execute the shutdown method.

[0011] In one embodiment, the thermal management method in the high temperature environment and the charge and discharge state:

[0012] If the maximum temperature of a single cell is ≥32 degrees Celsius and the average temperature of a single cell is ≥28 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a cooling mode command to the air conditioner, setting the cooling point to 18 degrees Celsius; if the maximum temperature of a single cell is ≤28 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0013] If 32 degrees Celsius> the maximum value of the single cell temperature ≥ 28 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature ≤ 6 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibition fault, the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature ≤ 25 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0014] If 32 degrees Celsius ≥ the maximum value of the single cell temperature ≥ 28 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature > 6 degrees Celsius, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤ 6 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0015] If the minimum temperature of a single cell is ≤13 degrees Celsius and the average temperature of a single cell is ≤15 degrees Celsius and there is no air conditioning fault level, BMS fault level, heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 15 degrees Celsius; if the minimum temperature of a single cell is ≥18 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0016] In one embodiment, the thermal management control method in a high-temperature environment and in a static state specifically includes: if the average temperature of the single cell is ≥30 degrees Celsius and the difference between the maximum temperature of the single cell and the minimum temperature of the single cell is ≤3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling fault prohibited, then the BMS sends a cooling mode instruction to the air conditioner to set the cooling point to 20 degrees Celsius; if the maximum temperature of the single cell is ≤25 degrees Celsius, then the BMS sends a standby mode instruction to the air conditioner;

[0017] If the difference between the maximum temperature of a single cell and the minimum temperature of a single cell is greater than 3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum temperature of the cell and the minimum temperature of the single cell is ≤3 degrees Celsius, the BMS sends a shutdown mode command to the air conditioner;

[0018] If the minimum temperature of a single cell is ≤13 degrees Celsius and the average temperature of a single cell is ≤15 degrees Celsius and there is no air conditioning fault level, BMS fault level, heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 15 degrees Celsius; if the minimum temperature of a single cell is ≥18 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0019] In one embodiment, the thermal management control method in the low temperature environment and the charge and discharge state specifically includes:

[0020] If the maximum temperature of a single cell is ≥36 degrees Celsius and the average temperature of a single cell is ≥30 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a cooling mode command to the air conditioner, setting the cooling point to 18 degrees Celsius; if the maximum temperature of a single cell is ≤30 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0021] If 36 degrees Celsius> the maximum value of the single cell temperature ≥ 30 degrees Celsius and the average value of the single cell temperature ≥ 28 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature ≤ 6 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibition fault, the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature ≤ 27 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0022] If 36 degrees Celsius ≥ the maximum value of the single cell temperature ≥ 30 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature > 6 degrees Celsius, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤ 6 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0023] If the minimum temperature of a single cell is ≤8 degrees Celsius and the average temperature of a single cell is ≤11 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 12 degrees Celsius; if the minimum temperature of a single cell is ≥13 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0024] In one embodiment, if the average value of the single cell temperature is ≥33 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling fault prohibited, the BMS sends a cooling mode instruction to the air conditioner, setting the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature is ≤28 degrees Celsius, the BMS sends a standby mode instruction to the air conditioner;

[0025] If the difference between the maximum temperature of a single cell and the minimum temperature of a single cell is greater than 3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum temperature of the cell and the minimum temperature of the single cell is ≤3 degrees Celsius, the BMS sends a shutdown mode command to the air conditioner;

[0026] If the minimum temperature of a single cell is ≤8 degrees Celsius and the average temperature of a single cell is ≤11 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 12 degrees Celsius; if the minimum temperature of a single cell is ≥13 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0027] In one embodiment, the shutdown thermal management control method specifically includes:

[0028] If the battery management system detects a fault that requires the system to be powered off, the BMS will issue a shutdown command to the air conditioner;

[0029] If the battery management system detects a serious fault forwarded by the air conditioner, the BMS will issue a shutdown command to the air conditioner;

[0030] If the battery management system detects a fault that prohibits heating or cooling, the BMS will issue a shutdown command to the air conditioner;

[0031] If the battery management system detects a communication failure with the liquid cooling unit, the BMS will issue a shutdown command to the air conditioner.

[0032] The beneficial effects of the low power consumption thermal management control method of the cold power storage system in this application are as follows:

[0033] 1. The present invention distinguishes the external ambient temperature to determine whether the current air-cooled energy storage system is in a high temperature environment or a low temperature environment. If it is in a low temperature environment, the thermal management control method in the low temperature environment is executed; otherwise, the thermal management control method in the high temperature environment is executed.

[0034] 2. The present invention distinguishes whether the air-cooled energy storage system is in a charging and discharging state or a static state, adjusts the air supply mode control method of the air conditioner under different working states, reduces the temperature difference between single battery cells, and improves the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the thermal management method of the present application;

[0036] Figure 2 This is a schematic diagram of the thermal management method for this application in a high temperature environment and a charging and discharging state;

[0037] Figure 3 This is a schematic diagram of the thermal management method for this application in a high-temperature environment and static state;

[0038] Figure 4 This is a schematic diagram of the thermal management method for this application in a low-temperature environment and a charging and discharging state;

[0039] Figure 5 This is a schematic diagram of the thermal management method of this application in a low-temperature and static state. DETAILED DESCRIPTION

[0040] In conjunction with the drawings in the embodiments of the present application, the schemes in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments in the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] This application proposes a low-power thermal management control method for a cold power storage system. Figure 1-5 , including: the air conditioner includes a compressor, an evaporator, a condenser, and an expansion valve; the working modes of the air conditioner include a stop mode, a cooling mode, a heating mode, a ventilation mode, and a standby mode. The thermal management control method of the battery management system determines the system state, sends a thermal management control signal, and requests the working mode of the air conditioner;

[0043] The thermal management control method specifically includes:

[0044] Determine whether the ambient temperature is ≥10°C and the battery is in a charge and discharge state. If so, execute the thermal management control method for high ambient temperature and charge and discharge state.

[0045] Determine whether the ambient temperature is ≥10°C and the battery is in a static state. If so, execute the thermal management control method for high ambient temperature and static state;

[0046] Determine whether the ambient temperature is less than 10°C and the battery is in a charge and discharge state. If so, execute the thermal management control method for low ambient temperature and charge and discharge state.

[0047] Determine whether the ambient temperature is less than 10°C and the battery is in a static state. If so, execute the thermal management control method for low ambient temperature and static state.

[0048] Determine whether the air conditioning fault level, BMS fault level, heating or cooling fault are met. If so, execute the shutdown method.

[0049] In one embodiment, the thermal management method in the high temperature environment and the charge and discharge state:

[0050] If the maximum temperature of a single cell is ≥32 degrees Celsius and the average temperature of a single cell is ≥28 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a cooling mode command to the air conditioner, setting the cooling point to 18 degrees Celsius; if the maximum temperature of a single cell is ≤28 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0051] If 32 degrees Celsius> the maximum value of the single cell temperature ≥ 28 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature ≤ 6 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibition fault, the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature ≤ 25 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0052] If 32 degrees Celsius ≥ the maximum value of the single cell temperature ≥ 28 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature > 6 degrees Celsius, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤ 6 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0053] If the minimum temperature of a single cell is ≤13 degrees Celsius and the average temperature of a single cell is ≤15 degrees Celsius and there is no air conditioning fault level, BMS fault level, heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 15 degrees Celsius; if the minimum temperature of a single cell is ≥18 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0054] In one embodiment, the thermal management control method in a high-temperature environment and in a static state specifically includes: if the average temperature of the single cell is ≥30 degrees Celsius and the difference between the maximum temperature of the single cell and the minimum temperature of the single cell is ≤3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling fault prohibited, then the BMS sends a cooling mode instruction to the air conditioner to set the cooling point to 20 degrees Celsius; if the maximum temperature of the single cell is ≤25 degrees Celsius, then the BMS sends a standby mode instruction to the air conditioner;

[0055] If the difference between the maximum temperature of a single cell and the minimum temperature of a single cell is greater than 3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum temperature of the cell and the minimum temperature of the single cell is ≤3 degrees Celsius, the BMS sends a shutdown mode command to the air conditioner;

[0056] If the minimum temperature of a single cell is ≤13 degrees Celsius and the average temperature of a single cell is ≤15 degrees Celsius and there is no air conditioning fault level, BMS fault level, heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 15 degrees Celsius; if the minimum temperature of a single cell is ≥18 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0057] In one embodiment, the thermal management control method in the low temperature environment and the charge and discharge state specifically includes:

[0058] If the maximum temperature of a single cell is ≥36 degrees Celsius and the average temperature of a single cell is ≥30 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a cooling mode command to the air conditioner, setting the cooling point to 18 degrees Celsius; if the maximum temperature of a single cell is ≤30 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0059] If 36 degrees Celsius> the maximum value of the single cell temperature ≥ 30 degrees Celsius and the average value of the single cell temperature ≥ 28 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature ≤ 6 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibition fault, the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature ≤ 27 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0060] If 36 degrees Celsius ≥ the maximum value of the single cell temperature ≥ 30 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature > 6 degrees Celsius, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤ 6 degrees Celsius, the BMS sends a standby mode command to the air conditioner;

[0061] If the minimum temperature of a single cell is ≤8 degrees Celsius and the average temperature of a single cell is ≤11 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 12 degrees Celsius; if the minimum temperature of a single cell is ≥13 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0062] In one embodiment, if the average value of the single cell temperature is ≥33 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling fault prohibited, the BMS sends a cooling mode instruction to the air conditioner, setting the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature is ≤28 degrees Celsius, the BMS sends a standby mode instruction to the air conditioner;

[0063] If the difference between the maximum temperature of a single cell and the minimum temperature of a single cell is greater than 3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum temperature of the cell and the minimum temperature of the single cell is ≤3 degrees Celsius, the BMS sends a shutdown mode command to the air conditioner;

[0064] If the minimum temperature of a single cell is ≤8 degrees Celsius and the average temperature of a single cell is ≤11 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 12 degrees Celsius; if the minimum temperature of a single cell is ≥13 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

[0065] In one embodiment, the shutdown thermal management control method specifically includes:

[0066] If the battery management system detects a fault that requires the system to be powered off, the BMS will issue a shutdown command to the air conditioner;

[0067] If the battery management system detects a serious fault forwarded by the air conditioner, the BMS will issue a shutdown command to the air conditioner;

[0068] If the battery management system detects a fault that prohibits heating or cooling, the BMS will issue a shutdown command to the air conditioner;

[0069] If the battery management system detects a communication failure with the liquid cooling unit, the BMS will issue a shutdown command to the air conditioner.

[0070] The beneficial effects of the low power consumption thermal management control method of the cold power storage system in this application are as follows:

[0071] 1. The present invention distinguishes the external ambient temperature to determine whether the current air-cooled energy storage system is in a high temperature environment or a low temperature environment. If it is in a low temperature environment, the thermal management control method in the low temperature environment is executed; otherwise, the thermal management control method in the high temperature environment is executed.

[0072] 2. The present invention distinguishes whether the air-cooled energy storage system is in a charging and discharging state or a static state, adjusts the air supply mode control method of the air conditioner under different working states, reduces the temperature difference between single battery cells, and improves the service life of the battery.

[0073] The above are only partial or preferred embodiments of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A low power consumption thermal management control method for a cold power storage system, characterized in that: include: The air conditioner includes a compressor, an evaporator, a condenser, and an expansion valve; the working modes of the air conditioner include a shutdown mode, a cooling mode, a heating mode, a ventilation mode, and a standby mode. The thermal management control method of the battery management system determines the system state, sends a thermal management control signal, and requests the working mode of the air conditioner; The thermal management control method specifically includes: Determine whether the ambient temperature is ≥10°C and the battery is in a charge and discharge state. If so, execute the thermal management control method for high ambient temperature and charge and discharge state. Determine whether the ambient temperature is ≥10°C and the battery is in a static state. If so, execute the thermal management control method for high ambient temperature and static state; Determine whether the ambient temperature is less than 10°C and the battery is in a charge and discharge state. If so, execute the thermal management control method for low ambient temperature and charge and discharge state. Determine whether the ambient temperature is less than 10°C and the battery is in a static state. If so, execute the thermal management control method for low ambient temperature and static state. Determine whether the air conditioning fault level, BMS fault level, heating or cooling fault are met. If so, execute the shutdown method.

2. The low power consumption thermal management control method for cold power storage system according to claim 1, characterized in that: Thermal management method for high temperature environment and charging and discharging state: If the maximum temperature of a single cell is ≥32 degrees Celsius and the average temperature of a single cell is ≥28 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a cooling mode command to the air conditioner, setting the cooling point to 18 degrees Celsius; if the maximum temperature of a single cell is ≤28 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If 32 degrees Celsius> the maximum value of the single cell temperature ≥ 28 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature ≤ 6 degrees Celsius and there is no air conditioning fault level, BMS fault level, heating or cooling prohibition fault, then the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; If the maximum temperature of the single cell is ≤25 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If 32 degrees Celsius ≥ the maximum value of the single cell temperature ≥ 28 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature > 6 degrees Celsius, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤ 6 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If the minimum temperature of a single cell is ≤13 degrees Celsius and the average temperature of a single cell is ≤15 degrees Celsius and there is no air conditioner fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 15 degrees Celsius; If the minimum temperature of the single battery cell is ≥18 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

3. The low power consumption thermal management control method for cold power storage system according to claim 1, characterized in that: The thermal management control method in a high-temperature environment and in a static state specifically includes: if the average temperature of the single cell is ≥30 degrees Celsius and the difference between the maximum temperature of the single cell and the minimum temperature of the single cell is ≤3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling fault prohibited, then the BMS sends a cooling mode instruction to the air conditioner to set the cooling point to 20 degrees Celsius; if the maximum temperature of the single cell is ≤25 degrees Celsius, then the BMS sends a standby mode instruction to the air conditioner; If the difference between the maximum temperature of a single cell and the minimum temperature of a single cell is greater than 3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum temperature of the cell and the minimum temperature of the single cell is ≤3 degrees Celsius, the BMS sends a shutdown mode command to the air conditioner; If the minimum temperature of a single cell is ≤13 degrees Celsius and the average temperature of a single cell is ≤15 degrees Celsius and there is no air conditioning fault level, BMS fault level, heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 15 degrees Celsius; if the minimum temperature of a single cell is ≥18 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

4. The low power consumption thermal management control method for cold power storage system according to claim 1, characterized in that: The thermal management control method in the low temperature environment and the charge and discharge state specifically includes: If the maximum temperature of a single cell is ≥36 degrees Celsius and the average temperature of a single cell is ≥30 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a cooling mode command to the air conditioner, setting the cooling point to 18 degrees Celsius; if the maximum temperature of a single cell is ≤30 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If 36 degrees Celsius> the maximum value of the single cell temperature ≥ 30 degrees Celsius and the average value of the single cell temperature ≥ 28 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature ≤ 6 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibition fault, the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; if the maximum value of the single cell temperature ≤ 27 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If 36 degrees Celsius ≥ the maximum value of the single cell temperature ≥ 30 degrees Celsius and the average value of the single cell temperature ≥ 26 degrees Celsius and the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature > 6 degrees Celsius, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum value of the single cell temperature and the minimum value of the single cell temperature is ≤ 6 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If the minimum temperature of a single cell is ≤8 degrees Celsius and the average temperature of a single cell is ≤11 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 12 degrees Celsius; if the minimum temperature of a single cell is ≥13 degrees Celsius, the BMS sends a standby mode command to the air conditioner.

5. The low power consumption thermal management control method for cold power storage system according to claim 1, characterized in that: If the average temperature of the single cell is ≥33 degrees Celsius and the difference between the maximum temperature of the single cell and the minimum temperature of the single cell is ≤3 degrees Celsius and there is no air conditioner fault level, BMS fault level, or heating or cooling prohibition fault, the BMS sends a cooling mode command to the air conditioner and sets the cooling point to 20 degrees Celsius; If the maximum temperature of the single cell is ≤28 degrees Celsius, the BMS sends a standby mode command to the air conditioner; If the difference between the maximum temperature of a single cell and the minimum temperature of a single cell is greater than 3 degrees Celsius and there is no air conditioning fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a wind mode command to the air conditioner; if the difference between the maximum temperature of the cell and the minimum temperature of the single cell is ≤3 degrees Celsius, the BMS sends a shutdown mode command to the air conditioner; If the minimum temperature of a single cell is ≤8 degrees Celsius and the average temperature of a single cell is ≤11 degrees Celsius and there is no air conditioner fault level, BMS fault level, or heating or cooling prohibited fault, the BMS sends a heating mode command to the air conditioner and sets the heating point to 12 degrees Celsius; If the minimum temperature of the single battery cell is ≥13 degrees Celsius, the BMS will send a standby mode command to the air conditioner.

6. The low power consumption thermal management control method for cold power storage system according to claim 1, characterized in that: The shutdown thermal management control method specifically includes: If the battery management system detects a fault that requires the system to be powered off, the BMS will issue a shutdown command to the air conditioner; If the battery management system detects a serious fault forwarded by the air conditioner, the BMS will issue a shutdown command to the air conditioner; If the battery management system detects a fault that prohibits heating or cooling, the BMS will issue a shutdown command to the air conditioner; If the battery management system detects a communication failure with the liquid cooling unit, the BMS will issue a shutdown command to the air conditioner.

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