A thermal management system for energy storage batteries based on voltage and soc level balancing control

Abstract

The present application belongs to the technical field of energy storage battery thermal management, and particularly relates to an energy storage battery thermal management system based on voltage and Soc average balance control. The energy storage battery thermal management system based on voltage and Soc average balance control comprises a thermal management control unit based on voltage change of the energy storage battery. The energy storage battery thermal management system based on voltage and Soc average balance control can be used in large-scale energy storage structure and new energy power system to realize heat dissipation optimization management of high-density energy storage module. By optimizing the operation mode of the energy storage battery and the module, the temperature state in the energy storage system is optimized, the temperature difference is reduced, the problems such as overheating and overcooling of the system are avoided, and each energy storage battery in the energy storage module is kept at the best working temperature as much as possible.

Description

Technical Field

[0001] This invention belongs to the field of energy storage battery thermal management technology, and particularly relates to an energy storage battery thermal management system based on voltage and SOC level equalization control. Background Technology

[0002] With the rapid development of clean energy globally, new energy power systems are becoming an increasingly important component of future power systems in various countries. New energy sources include various types such as wind power, photovoltaic power, and tidal power. Due to the inherent characteristics of new energy generation, they exhibit volatility and randomness, requiring supporting new energy storage systems to store and control electrical energy to achieve stable power output. Thermal management of energy storage batteries is a crucial component of the operation and management of energy storage systems. Energy storage batteries are highly temperature sensitive, and the higher the total capacity of the batteries, the greater the heat generation, which has a greater impact on the operational stability of the batteries. This is a challenge limiting the large-scale stable application of energy storage systems. Traditional solutions aim to optimize the heat generation of energy storage batteries by optimizing the layout design of battery modules and the structure of the heat dissipation system. However, the effectiveness of this approach in thermal management is difficult to guarantee. Summary of the Invention

[0003] The purpose of this invention is to provide an energy storage battery thermal management system based on voltage and Soc level balanced control, which improves the effectiveness and stability of energy storage battery thermal management by combining charge and discharge management based on energy storage battery voltage changes and Soc level.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A thermal management system for an energy storage battery based on voltage and SOC level balancing control includes a thermal management control unit based on changes in the energy storage battery voltage; the thermal management control unit is used to perform the following steps:

[0006] 1a. Monitoring energy storage batteries Level, to determine whether the energy storage battery is in a state of equilibrium. Is the level within the preset stable range? If energy storage battery The level is at the preset level Stable range If the internal process proceeds to step 1b, then the energy storage battery... level Then proceed to step 1e; if the energy storage battery level Then proceed to step 1f;

[0007] 1b. Analyze the maximum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system Difference Does it meet the requirements? and If the conditions are met, the energy storage battery discharge procedure is initiated; otherwise, proceed to step 1c. It is the total number of energy storage modules in the system. This refers to the total number of energy storage batteries within each energy storage module. It refers to the first The voltage value of each energy storage battery; This refers to the preset upper limit of the allowable error for voltage difference detection;

[0008] 1c. Analyze the minimum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system Difference Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, proceed to step 1d.

[0009] 1d. Analyze the maximum energy storage battery capacity within the system. level Does it meet the requirements? and If the conditions are met, the energy storage battery discharge procedure is initiated; otherwise, proceed to step 1g. This refers to the average energy storage batteries within the system. level, It refers to the nth energy storage battery. level;

[0010] 1e. Analyze the maximum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system The difference Does it meet the requirements? If the conditions are met, the energy storage battery discharge procedure will be initiated; otherwise, proceed to step 1 hour. This refers to the preset lower limit of the allowable error for voltage difference detection;

[0011] 1f. Analyze the average energy storage battery voltage within the system. With minimum energy storage battery voltage The difference Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, proceed to step 1i.

[0012] 1g, the smallest energy storage battery in the analysis system. level Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, the next monitoring cycle will begin.

[0013] 1 hour, analyze the average energy storage battery voltage within the system. With minimum energy storage battery voltage The difference Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, the next monitoring cycle will begin.

[0014] 1i. Analyze the maximum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system The difference Does it meet the requirements? If the conditions are met, the energy storage battery discharge program is initiated; otherwise, the next monitoring cycle begins.

[0015] A further improvement or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and SOC level balancing control adopts a combined thermal management approach when multiple energy storage batteries in the energy storage module are simultaneously charging and discharging. Specifically:

[0016] 2a. Based on the voltage monitoring data of the energy storage battery, the voltage of the energy storage battery in the energy storage module is statistically analyzed to determine the maximum and minimum voltage of the energy storage battery. Energy storage batteries with the maximum or minimum voltage in the energy storage module whose voltage difference from the average voltage in the same module exceeds the allowable error are considered as a combined battery pack.

[0017] 2b. Analyze the voltage distribution within the combined battery pack and implement different thermal management measures based on different scenarios:

[0018] Scenario A: If the voltage of the energy storage batteries in the combined battery pack... Higher than The proportion of energy storage batteries is less than the minimum proportion. Then, for the energy storage battery voltage within the combined battery pack Higher than The energy storage battery initiates the energy storage battery discharge program, and the remaining energy storage battery in the combined battery pack initiates the energy storage battery charging program.

[0019] Scenario B: If the voltage of the energy storage batteries in the combined battery pack... Below The proportion of energy storage batteries is less than the minimum proportion. Then, for the energy storage battery voltage within the combined battery pack Below The energy storage battery initiates the energy storage battery charging program, and the remaining energy storage batteries in the combined battery pack initiate the energy storage battery charging program.

[0020] Scenario C: If both Scenario A and Scenario B exist simultaneously, then the voltage of the energy storage batteries within the combined battery pack... Higher than The energy storage battery initiates the energy storage battery discharge program, which affects the voltage of the energy storage batteries within the combined battery pack. Below The energy storage battery starts the energy storage battery charging program, while the remaining energy storage battery does not undergo processing.

[0021] in , , This refers to the average voltage of the energy storage batteries within a combined battery pack. Furthermore, the more energy storage batteries there are, the higher their rated voltage. The larger it is, the smaller it is.

[0022] For the aforementioned improved or preferred implementation scheme of the energy storage battery thermal management system based on voltage and SOC level equalization control, in case C, in order to further optimize the energy storage battery charge equalization control effect, the average charge level of the energy storage batteries in the combined battery pack is analyzed. Level, and based on the average of the energy storage battery Different processes are applied horizontally:

[0023] If the average value of energy storage batteries level If the average value of the energy storage battery is low, then the energy storage battery discharge program should be initiated first to avoid process phenomena; if the average value of the energy storage battery is low, then the energy storage battery discharge program should be initiated first to avoid process phenomena. level If so, the energy storage battery charging program will be initiated first to avoid over-discharge.

[0024] Further improvements or preferred embodiments of the aforementioned energy storage battery thermal management system based on voltage and SOC level balancing control, if the average... level Then compare the maximum battery voltage within the energy storage cells of the combined battery pack. With average voltage The difference and the average voltage of the energy storage cells in the combined battery pack With minimum battery voltage The difference between and Size; if If so, the energy storage battery discharge procedure will be initiated first; if If so, the energy storage battery charging process will be initiated first.

[0025] For further improvements or preferred implementations of the aforementioned energy storage battery thermal management system based on voltage and SOC level balancing control, if the difference between the maximum battery voltage and the average voltage within the energy storage batteries of the combined battery pack cannot be determined... The difference between the average voltage and the minimum voltage of the energy storage cells in the combined battery pack Size;

[0026] Then compare the maximum energy storage cells within the combined battery pack. level Compared with average level The difference and the average energy storage cells in the combined battery pack level With minimum level The difference Size; if If so, the energy storage battery discharge procedure will be initiated first; if If so, the energy storage battery charging process will be initiated first.

[0027] A further improvement or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and SOC level balancing control, wherein the stability range middle , .

[0028] Further improvements or preferred embodiments of the aforementioned energy storage battery thermal management system based on voltage and SOC level equalization control also include an energy storage module protection unit, including an energy storage battery line monitoring component, for monitoring the energy storage battery line status and issuing a line abnormality signal when an error occurs in the line status.

[0029] In a further improvement or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and SOC level equalization control, the energy storage module protection unit also includes an energy storage battery voltage and current monitoring component, which is used to monitor the charging and discharging voltage and charging and discharging current of each energy storage battery in the energy storage module, and to issue an abnormal current and voltage signal when the voltage and current exceed a preset threshold.

[0030] In a further improvement or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and SOC level equalization control, the energy storage module protection unit also includes an energy storage battery temperature monitoring component, which is used to monitor the temperature of each energy storage battery in the energy storage module during operation and to issue a temperature abnormality signal when the temperature exceeds a preset threshold.

[0031] In a further improved or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and SOC level balancing control, the thermal management control unit stops the charging and discharging program control when it detects any abnormal signal.

[0032] In a further improved or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and Soc level equalization control, the energy storage battery temperature monitoring component includes a space temperature sensor located inside the storage space where the energy storage module is located, and an energy storage battery temperature sensor located near the energy storage battery in the energy storage module.

[0033] The space temperature sensor collects the internal temperature of the storage space where the energy storage module is located after the energy storage module is in operation, and determines whether the internal temperature of the storage space is lower than the preset space low temperature threshold (10℃~12℃). If it is lower than the preset space low temperature threshold, the air conditioning heating function in the storage space is activated and the internal temperature of the storage space is continuously monitored.

[0034] When the temperature inside the storage space is detected to be higher than the preset low temperature threshold but lower than the preset high temperature threshold (28℃~30℃), the air conditioner inside the storage space will be put into standby mode.

[0035] When the internal temperature of the storage space is detected to exceed the preset high temperature threshold, the air conditioner inside the storage space is controlled to start the cooling function.

[0036] The energy storage battery temperature sensor collects the energy storage battery temperature after the energy storage module operates, and determines whether the energy storage battery temperature is lower than the preset energy storage battery high temperature threshold (32℃~35℃). If it is lower than the energy storage battery high temperature threshold, the heat dissipation module near the energy storage battery is controlled to remain in standby mode. If it is not lower than the energy storage battery high temperature threshold, the heat dissipation module is activated and the energy storage battery temperature is continuously monitored.

[0037] When the temperature of the energy storage battery is detected to be higher than the preset low temperature threshold (0℃~-2℃) and lower than the preset high temperature threshold, the heat dissipation module is controlled to maintain the current operating state.

[0038] When the temperature of the energy storage battery is detected to be lower than the preset low temperature threshold for the energy storage battery, the heat dissipation module is turned off.

[0039] Its beneficial effects are as follows:

[0040] The energy storage battery thermal management system based on voltage and SOC level equalization control of the present invention can be used in large-scale energy storage structures and new energy power systems to achieve heat dissipation optimization management of high-density energy storage modules. By optimizing the operation mode of energy storage batteries and modules, it optimizes the temperature state within the energy storage system, reduces temperature difference, avoids problems such as overheating and overcooling of the system, and keeps each energy storage battery in the energy storage module at its optimal operating temperature as much as possible. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the execution logic of the thermal management control unit;

[0042] Figure 2 This is a schematic diagram of the execution logic of the energy storage battery temperature monitoring component. Figure 1 ;

[0043] Figure 3 This is a schematic diagram of the execution logic of the energy storage battery temperature monitoring component. Figure 2 . Detailed Implementation

[0044] The present invention will be described in detail below with reference to specific embodiments.

[0045] This invention relates to a thermal management system for energy storage batteries based on voltage and SOC level equalization control. It is mainly used in large-scale integrated energy storage systems to improve the thermal management efficiency of energy storage modules by optimizing the control of the charging and discharging state of the energy storage battery and improving the external working environment temperature of the energy storage battery. This avoids the probability of overheating and overcooling in the energy storage system, optimizes the working state of the energy storage battery, and improves the overall performance of the energy storage system.

[0046] The main components of an energy storage battery thermal management system based on voltage and SOC level balancing control include a thermal management control unit based on changes in energy storage battery voltage.

[0047] The thermal management control unit based on the voltage change of the energy storage battery takes into account the transfer of energy and heat within the energy storage battery. By utilizing the charging and discharging process, it improves the energy storage efficiency within the energy storage battery while simultaneously transferring and balancing the heat within the battery, reducing the heat generation of the energy storage system and minimizing the temperature difference between energy storage batteries.

[0048] like Figure 1 As shown, the thermal management control unit is used to perform the following steps:

[0049] 1a. Monitoring energy storage batteries Level, to determine whether the energy storage battery is in a state of equilibrium. Is the level within the preset stable range? ,in , If energy storage battery The level is at the preset level Stable range If the internal process proceeds to step 1b, then the energy storage battery... level Then proceed to step 1e; if the energy storage battery level Then proceed to step 1f;

[0050] 1b. Analyze the maximum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system Difference Does it meet the requirements? and If the conditions are met, the energy storage battery discharge procedure is initiated; otherwise, proceed to step 1c. It is the total number of energy storage modules in the system. This refers to the total number of energy storage batteries within each energy storage module. It refers to the first The voltage value of each energy storage battery; This refers to the preset upper limit of the allowable error for voltage difference detection;

[0051] 1c. Analyze the minimum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system Difference Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, proceed to step 1d.

[0052] 1d. Analyze the maximum energy storage battery capacity within the system. level Does it meet the requirements? and If the conditions are met, the energy storage battery discharge procedure is initiated; otherwise, proceed to step 1g. This refers to the average energy storage batteries within the system. level, It refers to the nth energy storage battery. level;

[0053] 1e. Analyze the maximum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system The difference Does it meet the requirements? If the conditions are met, the energy storage battery discharge procedure will be initiated; otherwise, proceed to step 1 hour. This refers to the preset lower limit of the allowable error for voltage difference detection;

[0054] 1f. Analyze the average energy storage battery voltage within the system. With minimum energy storage battery voltage The difference Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, proceed to step 1i.

[0055] 1g, the smallest energy storage battery in the analysis system. level Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, the next monitoring cycle will begin.

[0056] 1 hour, analyze the average energy storage battery voltage within the system. With minimum energy storage battery voltage The difference Does it meet the requirements? If the conditions are met, the energy storage battery charging program will be started; otherwise, the next monitoring cycle will begin.

[0057] 1i. Analyze the maximum energy storage battery voltage within the system. Compared with the average energy storage battery voltage in the system The difference Does it meet the requirements? If the conditions are met, the energy storage battery discharge program is initiated; otherwise, the next monitoring cycle begins.

[0058] Specifically, during the aforementioned adjustment process, each energy storage battery achieves thermal management through independent control. Therefore, multiple energy storage batteries within each energy storage module may be charging and discharging simultaneously. To further improve thermal management efficiency, a combined thermal management approach is adopted, specifically:

[0059] 2a. Based on the voltage monitoring data of the energy storage battery, the voltage of the energy storage battery in the energy storage module is statistically analyzed to determine the maximum and minimum voltage of the energy storage battery. Energy storage batteries with the maximum or minimum voltage in the energy storage module whose voltage difference from the average voltage in the same module exceeds the allowable error are considered as a combined battery pack.

[0060] 2b. Analyze the voltage distribution within the combined battery pack and implement different thermal management measures based on different scenarios:

[0061] Scenario A: If the voltage of the energy storage batteries in the combined battery pack... Higher than The proportion of energy storage batteries is less than the minimum proportion. Then, for the energy storage battery voltage within the combined battery pack Higher than The energy storage battery initiates the energy storage battery discharge program, and the remaining energy storage battery in the combined battery pack initiates the energy storage battery charging program.

[0062] Scenario B: If the voltage of the energy storage batteries in the combined battery pack... Below The proportion of energy storage batteries is less than the minimum proportion. Then, for the energy storage battery voltage within the combined battery pack Below The energy storage battery initiates the energy storage battery charging program, and the remaining energy storage batteries in the combined battery pack initiate the energy storage battery charging program.

[0063] Scenario C: If both Scenario A and Scenario B exist simultaneously, then the voltage of the energy storage batteries within the combined battery pack... Higher than The energy storage battery initiates the energy storage battery discharge program, which affects the voltage of the energy storage batteries within the combined battery pack. Below The energy storage battery starts the energy storage battery charging program, while the remaining energy storage battery does not undergo processing.

[0064] in , , This refers to the average voltage of the energy storage batteries within a combined battery pack. Furthermore, the more energy storage batteries there are, the higher their rated voltage. The larger, otherwise the smaller;

[0065] For scenario C mentioned above, in order to further optimize the energy storage battery power balance control effect, the following control scheme is adopted;

[0066] Analysis of the average energy storage cells within the combined battery pack Level, and based on the average of the energy storage battery Different processes are applied horizontally:

[0067] If the average value of energy storage batteries level If the average value of the energy storage battery is low, then the energy storage battery discharge program should be initiated first to avoid process phenomena; if the average value of the energy storage battery is low, then the energy storage battery discharge program should be initiated first to avoid process phenomena. level If so, the energy storage battery charging program will be initiated first to avoid over-discharge;

[0068] If the average value of energy storage batteries level Then compare the maximum battery voltage within the energy storage cells of the combined battery pack. With average voltage The difference and the average voltage of the energy storage cells in the combined battery pack With minimum battery voltage The difference between and Size; if If so, the energy storage battery discharge procedure will be initiated first; if If so, the energy storage battery charging program will be initiated first;

[0069] If the difference between the maximum and average cell voltages within the energy storage cells of the combined battery pack cannot be determined... The difference between the average voltage and the minimum voltage of the energy storage cells in the combined battery pack The size; then compare the largest energy storage battery within the combined battery pack. level Compared with average level The difference and the average energy storage cells in the combined battery pack level With minimum level The difference Size; if If so, the energy storage battery discharge procedure will be initiated first; if If so, the energy storage battery charging program will be initiated first;

[0070] It also includes an energy storage module protection unit, including:

[0071] The energy storage battery line monitoring component is used to monitor the status of the energy storage battery line and issue a line abnormality signal when an error occurs in the line status;

[0072] The energy storage battery voltage and current monitoring component is used to monitor the charging and discharging voltage and current of each energy storage battery in the energy storage module, and to issue an abnormal current and voltage signal when the voltage and current exceed the preset threshold.

[0073] The energy storage battery temperature monitoring component is used to monitor the temperature of each energy storage battery in the energy storage module during operation and to issue a temperature abnormality signal when the temperature exceeds a preset threshold.

[0074] The thermal management control unit stops controlling the charging and discharging process when it detects any abnormal signal.

[0075] like Figure 2 , Figure 3 As shown, the energy storage battery temperature monitoring component includes a space temperature sensor located inside the storage space where the energy storage module is located, and an energy storage battery temperature sensor located near the energy storage battery in the energy storage module.

[0076] The space temperature sensor collects the internal temperature of the storage space where the energy storage module is located after the energy storage module is in operation, and determines whether the internal temperature of the storage space is lower than the preset space low temperature threshold (10℃~12℃). If it is lower than the preset space low temperature threshold, the air conditioning heating function in the storage space is activated and the internal temperature of the storage space is continuously monitored.

[0077] When the temperature inside the storage space is detected to be higher than the preset low temperature threshold but lower than the preset high temperature threshold (28℃~30℃), the air conditioner inside the storage space will be put into standby mode.

[0078] When the internal temperature of the storage space is detected to exceed the preset high temperature threshold, the air conditioner inside the storage space is controlled to start the cooling function.

[0079] The energy storage battery temperature sensor collects the energy storage battery temperature after the energy storage module operates, and determines whether the energy storage battery temperature is lower than the preset energy storage battery high temperature threshold (32℃~35℃). If it is lower than the energy storage battery high temperature threshold, the heat dissipation module near the energy storage battery is controlled to remain in standby mode. If it is not lower than the energy storage battery high temperature threshold, the heat dissipation module is activated and the energy storage battery temperature is continuously monitored.

[0080] When the temperature of the energy storage battery is detected to be higher than the preset low temperature threshold (0℃~-2℃) and lower than the preset high temperature threshold, the heat dissipation module is controlled to maintain the current operating state.

[0081] When the temperature of the energy storage battery is detected to be lower than the preset low temperature threshold for the energy storage battery, the heat dissipation module is turned off.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A thermal management system for energy storage batteries based on voltage and SOC level balancing control, characterized in that, The thermal management control unit based on the voltage change of the energy storage battery; the thermal management control unit is used to perform the following steps: 1a, monitoring the energy storage battery horizontal, determining whether the energy storage battery is in horizontal is in a preset stable interval ; if the energy storage battery horizontal is in a preset stable interval , go to step 1b, if the energy storage battery horizontal , go to step 1e; if the energy storage battery horizontal , go to step 1f; 1b. Analyzing the maximum energy storage cell voltage of the energy storage cells within the system the average energy storage cell voltage of the energy storage cells within the system the difference whether the condition is met and ; if the condition is met, initiating the energy storage cell discharge procedure, and if the condition is not met, proceeding to step 1c; wherein N is the total number of energy storage modules within the system, M is the total number of energy storage cells within each energy storage module, is the voltage value of the energy storage cell ; and is the upper limit of the preset voltage difference detection allowable error 1c. Analyze the minimum energy storage battery voltage of the energy storage battery within the system the average energy storage battery voltage of the energy storage battery within the system the difference whether the condition is met if the condition is met, initiate the energy storage battery charging procedure, if the condition is not met, go to step 1d 1d. Analyze the maximum energy storage battery of the energy storage batteries in the system level whether the condition is met and if the condition is met, start the energy storage battery discharge program, if the condition is not met, go to step 1g; wherein refers to the average level of the energy storage batteries in the system refers to the level of the nth energy storage battery 1e. Analyzing the difference between the maximum energy storage cell voltage of the energy storage cells in the system and the average energy storage cell voltage of the energy storage cells in the system If yes, initiate the energy storage cell discharge procedure, if no, go to step 1h; wherein is a pre-set lower limit of the allowable error for the voltage difference detection​​​ 1f. Analyze the average energy storage cell voltage of the energy storage system the minimum energy storage cell voltage whether the condition is met, if so, initiate the energy storage cell charging procedure, if not, go to step 1i;​ 1g, analyzing system minimum energy storage battery horizontal whether the condition is met if the condition is met, initiate the energy storage battery charging program, if not, proceed to the next monitoring cycle; 1h. analyzing the average energy storage cell voltage of the energy storage system the difference between the minimum energy storage cell voltage whether the condition is met, if so, initiating an energy storage cell charging procedure, if not, proceeding to the next monitoring cycle;​ 1i. Analyzing the maximum energy storage cell voltage of the energy storage cells within the system the difference between the average energy storage cell voltage of the energy storage cells within the system whether the condition is met, and if so, initiating an energy storage cell discharge procedure, and if not, entering the next monitoring cycle.​ 2. The voltage and SOC level balanced control based thermal management system for energy storage battery according to claim 1, wherein, When multiple energy storage batteries in the energy storage module are simultaneously charging and discharging, joint thermal management is adopted, specifically: 2a, based on the voltage monitoring data of the energy storage battery, the voltage of the energy storage battery in the energy storage module is counted, the maximum voltage and the minimum voltage of the energy storage battery are determined, and the energy storage battery with the maximum voltage or the minimum voltage in the energy storage module is determined as the joint battery group; 2b, analyze the voltage distribution state in the joint battery group, and perform different thermal management processes according to different situations: Scenario A: If the voltage of the energy storage batteries in the combined battery pack... Higher than The proportion of energy storage batteries is less than the minimum proportion. Then, for the energy storage battery voltage within the combined battery pack Higher than The energy storage battery initiates the energy storage battery discharge program, and the remaining energy storage battery in the combined battery pack initiates the energy storage battery charging program. Case B: if the proportion of the number of energy storage batteries with voltage lower than in the joint battery pack is less than the minimum proportion , start the energy storage battery charging program for the energy storage batteries with voltage lower than in the joint battery pack, and start the energy storage battery charging program for the remaining energy storage batteries in the joint battery pack; Case C: If both Case A and Case B exist simultaneously, the energy storage battery with voltage higher than starts the energy storage battery discharge program, the energy storage battery with voltage lower than starts the energy storage battery charge program, and the remaining energy storage batteries do not perform processing; wherein , , is the average voltage of the energy storage cells within the joint battery pack; and the more energy storage cells there are and the higher the rated voltage of the energy storage cells the greater, otherwise the smaller.

3. The voltage and SOC level balanced control based thermal management system for energy storage battery according to claim 2, wherein, For the aforementioned case C, in order to further optimize the energy storage battery power balance control effect, the average level of the energy storage batteries in the joint battery pack is analyzed, and different treatments are performed according to the average level of the energy storage batteries: If the average level of the energy storage battery is below the lower threshold, then the energy storage battery discharge program is initiated in preference to avoid process phenomena; if the average level of the energy storage battery is above the upper threshold, then the energy storage battery charge program is initiated in preference to avoid over-discharge phenomena.

4. The voltage and SOC level balanced control based thermal management system for energy storage battery according to claim 3, wherein, If the average value of the energy storage battery level Then compare the maximum battery voltage within the energy storage cells of the combined battery pack. With average voltage The difference and the average voltage of the energy storage cells in the combined battery pack With minimum battery voltage The difference between and Size; if If so, the energy storage battery discharge procedure will be initiated first; if If so, the energy storage battery charging process will be initiated first.

5. The voltage and SOC level balanced control based thermal management system for energy storage battery according to claim 4, wherein, If the difference between the maximum cell voltage and the average cell voltage of the energy storage cells within the joint battery pack cannot be determined and the difference between the average cell voltage and the minimum cell voltage of the energy storage cells within the joint battery pack cannot be determined; then compare the difference between the maximum level of the energy storage cells in the union set to the average level of the energy storage cells in the union set and the difference between the average level of the energy storage cells in the union set to the minimum level of the energy storage cells in the union set ; if , then preferentially initiate the energy storage cell discharge routine; if , then preferentially initiate the energy storage cell charge routine.

6. The voltage and state of charge (Soc) level balanced control based energy storage battery thermal management system of claim 1, wherein, The stable interval In , .

7. The voltage and state of charge (Soc) level balanced control based energy storage battery thermal management system of claim 1, wherein, There is also an energy storage module protection unit, including an energy storage battery line monitoring component, which is used to monitor the line state of the energy storage battery, and sends a line abnormal signal when the line state is wrong.

8. The voltage and SOC level balanced control based thermal management system for energy storage battery according to claim 7, wherein, The energy storage module protection unit also includes an energy storage battery voltage and current monitoring component for monitoring the charging and discharging voltage and current of each energy storage battery in the energy storage module, and sending a current and voltage abnormal signal when the voltage and current exceed the preset threshold; The energy storage module protection unit also includes an energy storage battery temperature monitoring component for monitoring the temperature of each energy storage battery during operation in the energy storage module, and sending a temperature abnormal signal when the temperature exceeds the preset threshold.

9. The voltage and state of charge (Soc) level balanced control based energy storage battery thermal management system of claim 8, wherein, The thermal management control unit stops the charging and discharging program control when any abnormal signal is monitored.

10. The voltage and state of charge (Soc) level balanced control based energy storage battery thermal management system of claim 8, wherein, The energy storage battery temperature monitoring component includes a space temperature sensor arranged inside the storage space where the energy storage module is located, and an energy storage battery temperature sensor arranged near the energy storage battery in the energy storage module; The space temperature sensor collects the temperature inside the storage space where the energy storage module is located after the energy storage module operates, judges whether the temperature inside the storage space is lower than the preset space low temperature threshold, if lower than the preset space low temperature threshold, starts the air conditioning heating function in the storage space and continuously monitors the temperature inside the storage space; When the temperature inside the storage space is monitored to be higher than the preset space low temperature threshold and lower than the preset space high temperature threshold 28~30℃, the air conditioner in the storage space is controlled to standby; When the temperature inside the storage space is monitored to be higher than the preset space high temperature threshold, the air conditioner in the storage space is controlled to start the refrigeration function; The energy storage battery temperature sensor collects the temperature of the energy storage battery after the energy storage module operates, judges whether the temperature of the energy storage battery is lower than the preset energy storage battery high temperature threshold, if lower than the energy storage battery high temperature threshold, controls the heat dissipation module near the energy storage battery to standby state, if not lower than the energy storage battery high temperature threshold, starts the heat dissipation module and continuously monitors the temperature of the energy storage battery; When the temperature of the energy storage battery is monitored to be higher than the preset energy storage battery low temperature threshold and lower than the preset energy storage battery high temperature threshold, the heat dissipation module is controlled to keep the current running state; When the temperature of the energy storage battery is monitored to be lower than the preset energy storage battery low temperature threshold, the heat dissipation module is turned off.

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