Energy storage battery thermal management system based on voltage and Soc level equalization control

Abstract

The invention 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 level balance control. Comprising 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 level balance control can be used in a large-scale energy storage structure and a new energy power system for realizing heat dissipation optimization management of a high-density energy storage module, and by optimizing the operation modes of the energy storage battery and the module, the temperature state in the energy storage system is optimized, the temperature difference is reduced, and the energy storage efficiency is improved. The problems of overheating, supercooling and the like of the system are avoided, and each energy storage battery in the energy storage module is kept at the optimal working temperature as far as possible.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal management of energy storage batteries, and in particular relates to a thermal management system for energy storage batteries based on voltage and SOC level balanced control. Background Art

[0002] With the rapid development of clean energy worldwide, the development of new energy power systems has become an increasingly important component of future power systems in various countries. New energy sources include various types of renewable energy, such as wind power generation, photovoltaic power generation, and tidal power generation. These sources are subject to volatility and randomness due to their inherent power generation characteristics, requiring a supporting new energy storage system to store and control the energy to achieve stable 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 energy storage battery, the greater the heat generated, which in turn has a greater impact on the operational stability of the energy storage battery. This is a challenge that limits the large-scale and stable application of energy storage systems. Traditional solutions address this issue by optimizing the layout design of the energy storage battery modules and the structure of the heat dissipation system. However, the effectiveness of this type of thermal management is difficult to guarantee. Summary of the Invention

[0003] The purpose of the present invention is to provide a thermal management system for energy storage batteries based on voltage and Soc level balanced control to improve the effectiveness and stability of thermal management of energy storage batteries by jointly managing the voltage change and Soc level of energy storage batteries.

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

[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 energy storage battery voltage changes; the thermal management control unit is configured to perform the following steps:

[0006] 1a. Monitoring energy storage batteries level, judge whether the energy storage battery is in Is the level within the preset stable range? If the energy storage battery Level is at preset Stable range Go to step 1b. If the energy storage battery level Go to step 1e; if the energy storage battery level Then go to step 1f;

[0007] 1b. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system Difference Is it satisfied and If the conditions are met, the energy storage battery discharge program is started. If not, go to step 1c. is the total number of energy storage modules in the system, Refers to the total number of energy storage batteries in each energy storage module. It refers to the The voltage value of each energy storage battery; Refers to the preset upper limit of allowable error for voltage difference detection;

[0008] 1c. Analyze the minimum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system Difference Is it satisfied If the conditions are met, the energy storage battery charging process is started. If not, go to step 1d.

[0009] 1d. Analyze the maximum energy storage capacity of the energy storage battery in the system level Is it satisfied and If the condition is satisfied, the energy storage battery discharge procedure is started; if not, go to step 1g; Refers to the average energy storage battery in the system level, Refers to the nth energy storage battery level;

[0010] 1e. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system The difference Is it satisfied If the conditions are met, the energy storage battery discharge procedure is started. If not, go to step 1h. Refers to the preset lower limit of allowable error for voltage difference detection;

[0011] 1f. Analyze the average energy storage battery voltage of the energy storage batteries in the system and minimum energy storage battery voltage The difference Is it satisfied If the conditions are met, the energy storage battery charging procedure is started; if not, go to step 1i;

[0012] 1g. Minimum energy storage battery for analysis system level Is it satisfied If the conditions are met, the energy storage battery charging process is started. If not, the next monitoring cycle is entered.

[0013] 1h, analyze the average energy storage battery voltage of the energy storage battery in the system and minimum energy storage battery voltage The difference Is it satisfied If the conditions are met, the energy storage battery charging program is started; if not, the next monitoring cycle is entered;

[0014] 1i. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system The difference Is it satisfied If the conditions are met, the energy storage battery discharge program is started; if not, the next monitoring cycle is entered.

[0015] A further improvement or preferred implementation of the aforementioned energy storage battery thermal management system based on voltage and SOC level balanced control is to adopt a joint thermal management process when multiple energy storage batteries are simultaneously charged and discharged in the energy storage module. Specifically:

[0016] 2a. Based on the voltage monitoring data of the energy storage batteries, the voltage of the energy storage batteries in the energy storage module is counted to determine the maximum and minimum voltages of the energy storage batteries. The energy storage batteries with the maximum or minimum voltage in the energy storage module and the energy storage batteries whose voltage difference with the average voltage in the same module exceeds the allowable error are regarded as a combined battery group;

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

[0018] Case A: If the voltage of the energy storage battery in the combined battery pack Higher than The proportion of energy storage batteries is less than the minimum proportion , then the voltage of the energy storage battery in the combined battery pack Higher than The energy storage battery starts the energy storage battery discharge program for the energy storage battery, and starts the energy storage battery charging program for the remaining energy storage batteries in the combined battery pack;

[0019] Case B: If the voltage of the energy storage battery in the combined battery pack Lower than The proportion of energy storage batteries is less than the minimum proportion , then the voltage of the energy storage battery in the combined battery pack Lower than The energy storage battery starts the energy storage battery charging program, and the energy storage battery charging program is started for the remaining energy storage batteries in the combined battery pack;

[0020] Case C: If both Case A and Case B exist, the voltage of the energy storage battery in the combined battery pack Higher than The energy storage battery starts the energy storage battery discharge program and adjusts the voltage of the energy storage battery in the combined battery pack. Lower than The energy storage battery starts the energy storage battery charging program, and the remaining energy storage batteries do not perform any processing;

[0021] in , , Refers to the average voltage of the energy storage batteries in the combined battery pack; And the more energy storage batteries there are, the higher the rated voltage of the energy storage batteries The bigger, otherwise the smaller.

[0022] For the above-mentioned further improvement or preferred implementation scheme of the energy storage battery thermal management system based on voltage and Soc level balanced control, for the above-mentioned situation C, in order to further optimize the energy storage battery charge balanced control effect, the average energy storage battery in the combined battery pack is analyzed. level, and based on the average Different levels of treatment:

[0023] If the average energy storage battery level , the energy storage battery discharge program is started first to avoid process phenomena; if the average level , the energy storage battery charging program will be started first to avoid over-discharge.

[0024] Further improvement or preferred implementation of the above energy storage battery thermal management system based on voltage and Soc level balanced control, if the average level , then compare the maximum battery voltage of the energy storage battery in the combined battery pack With the average voltage The difference and the average voltage of the energy storage batteries in the combined battery pack With minimum battery voltage The difference between The size of , the energy storage battery discharge program will be started first; if , the energy storage battery charging program will be started first.

[0025] Further improvement or preferred implementation of the aforementioned energy storage battery thermal management system based on voltage and Soc level balanced control, if the difference between the maximum battery voltage and the average voltage of the energy storage battery in the combined battery pack cannot be determined The difference between the average voltage of the energy storage battery in the combined battery pack and the minimum battery voltage size;

[0026] Then compare the maximum energy storage battery in the combined battery pack level and average level The difference and the average energy storage battery in the combined battery pack level With the minimum level The difference The size of , the energy storage battery discharge program will be started first; if , the energy storage battery charging program will be started first.

[0027] Further improvement or preferred implementation of the aforementioned energy storage battery thermal management system based on voltage and Soc level balanced control, the stable interval middle , .

[0028] A further improvement or preferred implementation scheme of the aforementioned energy storage battery thermal management system based on voltage and Soc level balanced control also includes an energy storage module protection unit, including an energy storage battery line monitoring component, which is used to monitor the energy storage battery line status and issue a line abnormality signal when an error occurs in the line status.

[0029] As a further improvement or preferred implementation of the aforementioned energy storage battery thermal management system based on voltage and Soc level balancing control, the energy storage module protection unit also includes an energy storage battery voltage and current monitoring component, which is used to monitor the charge and discharge voltage and charge and discharge current of each energy storage battery in the energy storage module, and to issue a current and voltage abnormality signal when the voltage and current exceed a preset threshold.

[0030] As a further improvement or preferred implementation of the aforementioned energy storage battery thermal management system based on voltage and Soc level balanced control, the energy storage module protection unit also includes an energy storage battery temperature monitoring component for monitoring the temperature of each energy storage battery in the energy storage module during operation and issuing a temperature abnormality signal when the temperature exceeds a preset threshold.

[0031] As a further improvement or preferred implementation scheme of the aforementioned energy storage battery thermal management system based on voltage and Soc level balanced control, the thermal management control unit stops the charge and discharge program control when any abnormal signal is detected.

[0032] A further improvement or preferred embodiment of the aforementioned energy storage battery thermal management system based on voltage and Soc level balanced control, wherein the energy storage battery temperature monitoring component includes a space temperature sensor provided inside the storage space where the energy storage module is located, and an energy storage battery temperature sensor provided near the energy storage battery in the energy storage module;

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

[0034] When the internal temperature of the storage space is detected to be higher than the preset low temperature threshold and lower than the preset high temperature threshold (28°C to 30°C), the air conditioner in the storage space is controlled to standby mode;

[0035] When the temperature inside the storage space is detected to be higher than the preset high temperature threshold, the air conditioner in 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 is in operation, and determines whether the energy storage battery temperature is lower than a preset energy storage battery high temperature threshold (32°C~35°C). 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 a standby state. If it is not lower than the energy storage battery high temperature threshold, the heat dissipation module is activated and the temperature of the energy storage battery 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 energy storage battery low temperature threshold, the heat dissipation module is turned off.

[0039] Its beneficial effects are:

[0040] The energy storage battery thermal management system based on voltage and Soc level balanced control of the present invention can be used to achieve heat dissipation optimization management of high-density energy storage modules in large-scale energy storage structures and new energy power systems. By optimizing the operating mode of the energy storage batteries and modules, the temperature state in the energy storage system is optimized, the temperature difference is reduced, and problems such as overheating and overcooling of the system are avoided. As much as possible, each energy storage battery in the energy storage module is kept at the optimal operating temperature. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0043] Figure 3 This is the execution logic diagram of the energy storage battery temperature monitoring component Figure 2 . DETAILED DESCRIPTION

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

[0045] The present invention relates to a thermal management system for energy storage batteries based on voltage and SOC level balanced control. The system is primarily used to improve the thermal management efficiency of energy storage modules in large-scale integrated energy storage systems by optimizing and controlling the charge and discharge states within the energy storage batteries and improving the external operating environment temperature of the energy storage batteries. This reduces the probability of overheating and overcooling within the energy storage system, optimizes the operating state of the energy storage batteries, and enhances the overall performance of the energy storage system.

[0046] The main components of the energy storage battery thermal management system based on voltage and Soc level balanced control include a thermal management control unit based on the voltage change of the energy storage battery.

[0047] The thermal management control unit based on the voltage change of the energy storage battery considers the transfer of energy and heat in the energy storage battery and uses the charging and discharging process to improve the energy storage efficiency of the energy storage battery while realizing the transfer and balance of heat in the energy storage battery, reducing the heat generation of the energy storage system and reducing the temperature difference between the 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, judge whether the energy storage battery is in Is the level within the preset stable range? ,in , If the energy storage battery Level is at preset Stable range Go to step 1b. If the energy storage battery level Go to step 1e; if the energy storage battery level Then go to step 1f;

[0050] 1b. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system Difference Is it satisfied and If the conditions are met, the energy storage battery discharge program is started. If not, go to step 1c. is the total number of energy storage modules in the system, Refers to the total number of energy storage batteries in each energy storage module. It refers to the The voltage value of each energy storage battery; Refers to the preset upper limit of allowable error for voltage difference detection;

[0051] 1c. Analyze the minimum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system Difference Is it satisfied If the conditions are met, the energy storage battery charging process is started. If not, go to step 1d.

[0052] 1d. Analyze the maximum energy storage capacity of the energy storage battery in the system level Is it satisfied and If the condition is satisfied, the energy storage battery discharge procedure is started; if not, go to step 1g; Refers to the average energy storage battery in the system level, Refers to the nth energy storage battery level;

[0053] 1e. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system The difference Is it satisfied If the conditions are met, the energy storage battery discharge procedure is started. If not, go to step 1h. Refers to the preset lower limit of allowable error for voltage difference detection;

[0054] 1f. Analyze the average energy storage battery voltage of the energy storage batteries in the system and minimum energy storage battery voltage The difference Is it satisfied If the conditions are met, the energy storage battery charging procedure is started; if not, go to step 1i;

[0055] 1g. Minimum energy storage battery for analysis system level Is it satisfied If the conditions are met, the energy storage battery charging process is started. If not, the next monitoring cycle is entered.

[0056] 1h, analyze the average energy storage battery voltage of the energy storage battery in the system and minimum energy storage battery voltage The difference Is it satisfied If the conditions are met, the energy storage battery charging program is started; if not, the next monitoring cycle is entered;

[0057] 1i. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system The difference Is it satisfied If the conditions are met, the energy storage battery discharge program is started; if not, the next monitoring cycle is entered;

[0058] In particular, during the aforementioned mediation process, each energy storage battery is thermally managed through independent control. Therefore, multiple energy storage batteries may be charged and discharged simultaneously within each energy storage module. To further improve thermal management efficiency, a joint thermal management process is adopted. Specifically:

[0059] 2a. Based on the voltage monitoring data of the energy storage batteries, the voltage of the energy storage batteries in the energy storage module is counted to determine the maximum and minimum voltages of the energy storage batteries. The energy storage batteries with the maximum or minimum voltage in the energy storage module and the energy storage batteries whose voltage difference with the average voltage in the same module exceeds the allowable error are regarded as a combined battery group;

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

[0061] Case A: If the voltage of the energy storage battery in the combined battery pack Higher than The proportion of energy storage batteries is less than the minimum proportion , then the voltage of the energy storage battery in the combined battery pack Higher than The energy storage battery starts the energy storage battery discharge program for the energy storage battery, and starts the energy storage battery charging program for the remaining energy storage batteries in the combined battery pack;

[0062] Case B: If the voltage of the energy storage battery in the combined battery pack Lower than The proportion of energy storage batteries is less than the minimum proportion , then the voltage of the energy storage battery in the combined battery pack Lower than The energy storage battery starts the energy storage battery charging program, and the energy storage battery charging program is started for the remaining energy storage batteries in the combined battery pack;

[0063] Case C: If both Case A and Case B exist, the voltage of the energy storage battery in the combined battery pack Higher than The energy storage battery starts the energy storage battery discharge program and adjusts the voltage of the energy storage battery in the combined battery pack. Lower than The energy storage battery starts the energy storage battery charging program, and the remaining energy storage batteries do not perform any processing;

[0064] in , , Refers to the average voltage of the energy storage batteries in the combined battery pack; And the more energy storage batteries there are, the higher the rated voltage of the energy storage batteries The bigger, otherwise the smaller;

[0065] For the above situation C, in order to further optimize the energy storage battery charge balancing control effect, the following control scheme is further adopted;

[0066] Analyze the average energy storage battery in the combined battery pack level, and based on the average Different levels of treatment:

[0067] If the average energy storage battery level , the energy storage battery discharge program is started first to avoid process phenomena; if the average level , the energy storage battery charging program will be started first to avoid over-discharge;

[0068] If the average energy storage battery level , then compare the maximum battery voltage of the energy storage battery in the combined battery pack With the average voltage The difference and the average voltage of the energy storage batteries in the combined battery pack With minimum battery voltage The difference between The size of , the energy storage battery discharge program will be started first; if , the energy storage battery charging program will be started first;

[0069] If the difference between the maximum cell voltage and the average voltage of the energy storage battery in the combined battery pack cannot be determined The difference between the average voltage of the energy storage battery in the combined battery pack and the minimum battery voltage The size of the energy storage battery in the combined battery pack is compared level and average level The difference and the average energy storage battery in the combined battery pack level With the minimum level The difference The size of , the energy storage battery discharge program will be started first; if , the energy storage battery charging program will be started first;

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

[0071] Energy storage battery line monitoring component, used to monitor the status of the energy storage battery line and send 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 charge and discharge voltage and charge and discharge current of each energy storage battery in the energy storage module, and send a current and voltage abnormality 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 issue a temperature abnormality signal when the temperature exceeds a preset threshold;

[0074] The thermal management control unit stops the charge and discharge program control when detecting any abnormal signal;

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

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

[0077] When the internal temperature of the storage space is detected to be higher than the preset low temperature threshold and lower than the preset high temperature threshold (28°C to 30°C), the air conditioner in the storage space is controlled to standby mode;

[0078] When the temperature inside the storage space is detected to be higher than the preset high temperature threshold, the air conditioner in 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 is in operation, and determines whether the energy storage battery temperature is lower than a preset energy storage battery high temperature threshold (32°C~35°C). 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 a standby state. If it is not lower than the energy storage battery high temperature threshold, the heat dissipation module is activated and the temperature of the energy storage battery 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 energy storage battery low temperature threshold, 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, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents 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 balanced control, characterized in that: It includes a 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 energy storage batteries level, judge whether the energy storage battery is in Is the level within the preset stable range? If the energy storage battery Level is at preset Stable range Go to step 1b. If the energy storage battery level Go to step 1e; if the energy storage battery level Then go to step 1f; 1b. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system Difference Is it satisfied and If the conditions are met, the energy storage battery discharge program is started. If not, go to step 1c. is the total number of energy storage modules in the system, Refers to the total number of energy storage batteries in each energy storage module. It refers to the The voltage value of each energy storage battery; Refers to the preset upper limit of allowable error for voltage difference detection; 1c. Analyze the minimum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system Difference Is it satisfied If the conditions are met, the energy storage battery charging process is started. If not, go to step 1d. 1d. Analyze the maximum energy storage capacity of the energy storage battery in the system level Is it satisfied and If the condition is satisfied, the energy storage battery discharge procedure is started; if not, go to step 1g; Refers to the average energy storage battery in the system level, Refers to the nth energy storage battery level; 1e. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system The difference Is it satisfied If the conditions are met, the energy storage battery discharge procedure is started. If not, go to step 1h. Refers to the preset lower limit of allowable error for voltage difference detection; 1f. Analyze the average energy storage battery voltage of the energy storage batteries in the system and minimum energy storage battery voltage The difference Is it satisfied If the conditions are met, the energy storage battery charging procedure is started; if not, go to step 1i; 1g. Minimum energy storage battery for analysis system level Is it satisfied If the conditions are met, the energy storage battery charging program is started; if not, the next monitoring cycle is entered; 1h, analyze the average energy storage battery voltage of the energy storage battery in the system and minimum energy storage battery voltage The difference Is it satisfied If the conditions are met, the energy storage battery charging program is started; if not, the next monitoring cycle is entered; 1i. Analyze the maximum energy storage battery voltage of the energy storage battery in the system The average energy storage battery voltage of the energy storage batteries in the system The difference Is it satisfied If the conditions are met, the energy storage battery discharge program is started; if not, the next monitoring cycle is entered.

2. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 1, characterized in that: When multiple energy storage batteries are charged and discharged simultaneously within the energy storage module, joint thermal management is adopted. Specifically: 2a. Based on the voltage monitoring data of the energy storage batteries, the voltage of the energy storage batteries in the energy storage module is counted to determine the maximum and minimum voltages of the energy storage batteries. The energy storage batteries with the maximum or minimum voltage in the energy storage module and the energy storage batteries whose voltage difference with the average voltage in the same module exceeds the allowable error are regarded as a combined battery group; 2b. Analyze the voltage distribution within the combined battery pack and implement different thermal management methods based on different situations: Case A: If the voltage of the energy storage battery in the combined battery pack Higher than The proportion of energy storage batteries is less than the minimum proportion , then the voltage of the energy storage battery in the combined battery pack Higher than The energy storage battery starts the energy storage battery discharge program for the energy storage battery, and starts the energy storage battery charging program for the remaining energy storage batteries in the combined battery pack; Case B: If the voltage of the energy storage battery in the combined battery pack Lower than The proportion of energy storage batteries is less than the minimum proportion , then the voltage of the energy storage battery in the combined battery pack Lower than The energy storage battery starts the energy storage battery charging program, and the energy storage battery charging program is started for the remaining energy storage batteries in the combined battery pack; Case C: If both Case A and Case B exist, the voltage of the energy storage battery in the combined battery pack Higher than The energy storage battery starts the energy storage battery discharge program and adjusts the voltage of the energy storage battery in the combined battery pack. Lower than The energy storage battery starts the energy storage battery charging program, and the remaining energy storage batteries do not perform any processing; in , , Refers to the average voltage of the energy storage batteries in the combined battery pack; And the more energy storage batteries there are, the higher the rated voltage of the energy storage batteries The bigger, otherwise the smaller.

3. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 2, characterized in that: For the above situation C, in order to further optimize the energy storage battery charge balancing control effect, the average energy storage battery in the combined battery pack is analyzed. level, and based on the average Different levels of treatment: If the average energy storage battery level , the energy storage battery discharge program is started first to avoid process phenomena; if the average level , the energy storage battery charging program will be started first to avoid over-discharge.

4. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 3, characterized in that: If the average energy storage battery level , then compare the maximum battery voltage of the energy storage battery in the combined battery pack With the average voltage The difference and the average voltage of the energy storage batteries in the combined battery pack With minimum battery voltage The difference between The size of , the energy storage battery discharge program will be started first; if , the energy storage battery charging program will be started first.

5. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 4, characterized in that: If the difference between the maximum cell voltage and the average voltage of the energy storage battery in the combined battery pack cannot be determined The difference between the average voltage of the energy storage battery in the combined battery pack and the minimum battery voltage size; Then compare the maximum energy storage battery in the combined battery pack level and average level The difference and the average energy storage battery in the combined battery pack level With the minimum level The difference The size of , the energy storage battery discharge program will be started first; if , the energy storage battery charging program will be started first.

6. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 1, characterized in that: The stability interval middle , .

7. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 1, characterized in that: There is also an energy storage module protection unit, including an energy storage battery line monitoring component, which is used to monitor the energy storage battery line status and send a line abnormality signal when an error occurs in the line status.

8. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 7, characterized in that: The energy storage module protection unit also includes an energy storage battery voltage and current monitoring component, which is used to monitor the charge and discharge voltage and charge and discharge current of each energy storage battery in the energy storage module, and send a current and voltage abnormality 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, which is used to monitor the temperature of each energy storage battery in the energy storage module during operation and issue a temperature abnormality signal when the temperature exceeds a preset threshold.

9. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 8, characterized in that: The thermal management control unit stops the charge and discharge program control when detecting any abnormal signal.

10. The energy storage battery thermal management system based on voltage and Soc level balanced control according to claim 8, characterized in that: The energy storage battery temperature monitoring component includes a space temperature sensor provided inside the storage space where the energy storage module is located, and an energy storage battery temperature sensor provided near the energy storage battery in the energy storage module; After the energy storage module is in operation, the space temperature sensor collects the internal temperature of the storage space where the energy storage module is located, and determines whether the internal temperature of the storage space is lower than a preset space low temperature threshold. If it is lower than the preset space low temperature threshold, the air conditioning and heating function in the storage space is activated and the internal temperature of the storage space is continuously monitored; When the internal temperature of the storage space is detected to be higher than the preset low temperature threshold and lower than the preset high temperature threshold (28°C to 30°C), the air conditioner in the storage space is controlled to standby mode; When the temperature inside the storage space is detected to be higher than the preset high temperature threshold, the air conditioner in the storage space is controlled to start the cooling function; The energy storage battery temperature sensor collects the temperature of the energy storage battery after the energy storage module is in operation, and determines whether the temperature of the energy storage battery is lower than a preset high temperature threshold of the energy storage battery. If it is lower than the high temperature threshold of the energy storage battery, the heat dissipation module near the energy storage battery is controlled to remain in a standby state. If it is not lower than the high temperature threshold of the energy storage battery, the heat dissipation module is started and the temperature of the energy storage battery is continuously monitored; When the temperature of the energy storage battery is monitored to be higher than the preset low temperature threshold of the energy storage battery and lower than the preset high temperature threshold of the energy storage battery, the heat dissipation module is controlled to maintain the current operating state; When the temperature of the energy storage battery is detected to be lower than the preset energy storage battery low temperature threshold, the heat dissipation module is turned off.

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