Temperature control method and device for energy storage system, energy storage system and electrical equipment

Abstract

The present application relates to the field of energy storage technology and provides a temperature control method, device, energy storage system, and electrical equipment for an energy storage system. The method comprises: determining whether to perform pre-cooling based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value; if pre-cooling is determined to be performed, determining whether to start a liquid cooling unit to cool the energy storage system based on the current temperature, the average temperature of multiple battery cells, and a pre-cooling reference temperature, so as to at least provide additional cooling to the energy storage system when the temperature is low, thereby reducing electrical power, lowering power consumption, and improving cooling energy efficiency.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a temperature control method and device for an energy storage system, an energy storage system, and electrical equipment. Background Art

[0002] Energy storage systems store energy through media or devices and release it when needed. They help address temporal and spatial variations in energy supply and demand, improving the stability of power systems.

[0003] In related technologies, cooling of energy storage systems is one of the important research topics of energy storage systems. If the power consumption of energy storage systems during temperature control can be reduced, the performance of the energy storage systems will be significantly improved. Summary of the Invention

[0004] Based on this, it is necessary to provide a temperature control method, device, energy storage system and electrical equipment for an energy storage system to address the above technical problems, which can at least pre-cool the energy storage system based on the local temperature value and multiple temperature data of the battery cells, so as to achieve additional cooling of the energy storage system under low temperature conditions, reduce electric power, reduce electricity consumption, and improve cooling energy efficiency.

[0005] In a first aspect, an embodiment of the present application provides a temperature control method for an energy storage system, comprising:

[0006] When the energy storage system is not in operation, obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, preset maximum ambient temperature value, and preset minimum ambient temperature value;

[0007] Determining whether to perform pre-cooling based on the highest temperature value among the local daytime temperatures at the location of the energy storage system, the lowest temperature value among the local daytime temperatures at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value;

[0008] If pre-cooling is determined, whether to start the liquid cooling unit to cool the energy storage system is determined based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature;

[0009] The determination of whether to perform pre-cooling is made based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value, including:

[0010] If the local daytime temperature at the location of the energy storage system is higher than the preset maximum ambient temperature and lower than the preset minimum ambient temperature, pre-cooling is performed.

[0011] The local daytime temperature is the real-time temperature within 24 hours every day.

[0012] In some embodiments, the temperature control method of the energy storage system further includes:

[0013] If the local daytime temperature at the location of the energy storage system is such that the highest temperature value is less than or equal to the preset highest ambient temperature value, or the lowest temperature value is greater than or equal to the preset lowest ambient temperature value, it is determined that pre-cooling is not performed.

[0014] In some embodiments, the pre-cooling reference temperature of the liquid cooling unit is determined by the following steps:

[0015] Obtain the nighttime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the daytime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price;

[0016] Determine the reference value based on the nighttime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the daytime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price;

[0017] According to the reference value, the pre-cooling reference temperature is determined.

[0018] In some embodiments, the reference value is determined by the following formula:

[0019] ;

[0020] in, is the nighttime temperature energy efficiency ratio of the liquid-cooled unit; is the daytime temperature energy efficiency ratio of the liquid cooling unit; is the average temperature of the battery cell after pre-cooling; is the average temperature of the battery cell before pre-cooling; is the specific heat capacity of the battery cell; The nighttime electricity price; The daytime electricity price.

[0021] In some embodiments, determining the pre-cooling reference temperature according to the reference value includes:

[0022] The pre-cooling reference temperature is determined according to the reference value and a plurality of pre-set standard values.

[0023] In some embodiments, the method further comprises:

[0024] If the energy storage system is not in operation, determine whether to perform pre-cooling;

[0025] If the energy storage system is in working state, the energy storage system is controlled to perform staged cooling.

[0026] In some embodiments, controlling the energy storage system to perform staged cooling includes:

[0027] Determine whether the energy storage system requires staged cooling based on the maximum temperature of multiple battery cells and pre-set multi-level battery cell temperature thresholds;

[0028] If the energy storage system does not require staged cooling, the liquid cooling unit is controlled to execute the self-circulation mode.

[0029] In some embodiments, the temperature control method of the energy storage system further includes:

[0030] If the energy storage system requires staged cooling, the required cooling level of the energy storage system is determined based on the maximum temperature of multiple battery cells and the pre-set multi-stage battery cell temperature threshold;

[0031] Determine whether the current temperature at the location of the energy storage system is greater than a preset ambient temperature threshold;

[0032] If the current temperature is less than or equal to the preset ambient temperature threshold, the liquid cooling unit is controlled to cool at the current required cooling level;

[0033] If the current temperature is greater than the preset ambient temperature threshold, the liquid cooling unit is controlled to cool at the next cooling level below the current required cooling level;

[0034] The cooling capacity of the next refrigeration level is greater than the cooling capacity of the currently required refrigeration level.

[0035] In some embodiments, the temperature control method of the energy storage system further includes:

[0036] Get the current cooling level of the energy storage system;

[0037] Determine whether the highest temperature of multiple battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and determine whether the current temperature is greater than the preset ambient temperature threshold;

[0038] If the highest temperature of multiple battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and the current temperature is greater than the preset ambient temperature threshold, the liquid cooling unit is controlled to use the next two cooling levels for cooling;

[0039] Among them, the cooling capacity of the lower two refrigeration levels is greater than the cooling capacity of the next refrigeration level.

[0040] In some embodiments, the temperature control method of the energy storage system further includes:

[0041] If the highest temperature of multiple battery cells is less than or equal to the battery cell temperature threshold corresponding to the next cooling level, the liquid cooling unit is controlled to maintain the current cooling level for cooling.

[0042] In a second aspect, an embodiment of the present application further provides a temperature control device for an energy storage system, including a data acquisition module, a pre-cooling judgment module, and a pre-cooling starting module. The data acquisition module is used to obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, a preset maximum ambient temperature value, and a preset minimum ambient temperature value at the location of the energy storage system when the energy storage system is in an inoperative state; the pre-cooling judgment module is used to determine whether to perform pre-cooling based on the maximum temperature value of the local daytime temperature at the location of the energy storage system, the minimum temperature value of the local daytime temperature at the location of the energy storage system, the preset maximum ambient temperature value, and the preset minimum ambient temperature value; the pre-cooling starting module is used to determine whether to start the liquid cooling unit to cool the energy storage system based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature if pre-cooling is determined to be performed;

[0043] The pre-cooling judgment module is specifically configured to determine that pre-cooling is to be performed if the highest temperature value of the local daytime temperature at the location of the energy storage system is greater than a preset maximum ambient temperature value, and the lowest temperature value is less than a preset minimum ambient temperature value;

[0044] The local daytime temperature is the real-time temperature within 24 hours every day.

[0045] In a third aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the following steps are implemented:

[0046] When the energy storage system is not in operation, obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, preset maximum ambient temperature value, and preset minimum ambient temperature value;

[0047] Determining whether to perform pre-cooling based on the highest temperature value among the local daytime temperatures at the location of the energy storage system, the lowest temperature value among the local daytime temperatures at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value;

[0048] If pre-cooling is determined, whether to start the liquid cooling unit to cool the energy storage system is determined based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature;

[0049] The determination of whether to perform pre-cooling is made based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value, including:

[0050] If the local daytime temperature at the location of the energy storage system is higher than the preset maximum ambient temperature and lower than the preset minimum ambient temperature, pre-cooling is performed.

[0051] The local daytime temperature is the real-time temperature within 24 hours every day.

[0052] In a fourth aspect, an embodiment of the present application further provides an energy storage system, comprising: a battery pack, a management subsystem, an energy storage converter, and a thermal management subsystem, wherein the thermal management subsystem is used to execute the steps of the temperature control method of the energy storage system in any of the above embodiments.

[0053] In a fifth aspect, an embodiment of the present application further provides an electrical device, which includes the temperature control device of the energy storage system in any of the above embodiments.

[0054] The temperature control method, device, energy storage system and electrical equipment of the above-mentioned energy storage system can judge pre-cooling based on the local temperature value, multiple temperature data of the battery cell and multiple preset threshold data, and when the conditions are met, pre-cool the energy storage system based on the local temperature value, multiple temperature data of the battery cell and the pre-cooling reference temperature, thereby achieving additional cooling of the energy storage system under low temperature conditions, reducing electric power, lowering electricity consumption and improving cooling energy efficiency.

[0055] At the same time, when the energy storage system cannot be pre-cooled, the energy storage system is cooled in stages according to the ambient temperature, battery cell temperature and multi-level temperature thresholds to ensure the effectiveness of temperature control of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0057] Figure 1is a flow chart of a temperature control method for an energy storage system in some embodiments;

[0058] Figure 2 Schematic diagram of a flow chart of a temperature control method for an energy storage system in other embodiments;

[0059] Figure 3 Schematic diagram of a flow chart of a temperature control method for an energy storage system in some other embodiments;

[0060] Figure 4 Schematic diagram of the structure of a temperature control device of an energy storage system in some embodiments;

[0061] Figure 5 Schematic diagram of the internal structure of a computer device in some embodiments.

[0062] Reference numerals and descriptions:

[0063] 20. Data acquisition module; 30. Pre-cooling judgment module; 40. Pre-cooling starting module. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0065] It should be noted that energy storage systems are generally used to store energy in solar power stations or wind power stations. Solar power stations or wind power stations are generally built in areas rich in wind or solar energy, such as mountainous areas or desert areas. Generally speaking, areas rich in wind or solar energy, such as deserts, mountainous areas and seaside areas, have large temperature differences between day and night. The heat generated by the energy storage system during operation is difficult to be discharged to the outside through the refrigeration system when the ambient temperature is high, resulting in poor cooling effect and high energy consumption of the refrigeration system. The present application aims to propose a temperature control method, device, energy storage system and electrical equipment for an energy storage system, which can at least perform pre-cooling when the ambient temperature is low, thereby improving the cooling effect and reducing power consumption.

[0066] Please refer to Figure 1 In an exemplary embodiment, a temperature control method for an energy storage system is provided, comprising the following steps S101 to S103.

[0067] Step S101 , obtaining the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, preset maximum ambient temperature value, and preset minimum ambient temperature value of the location where the energy storage system is located.

[0068] Here, the local daytime temperature may be obtained by obtaining the local actual temperature or the actual temperature displayed by the weather forecast.

[0069] Step S102 , determining whether to perform pre-cooling based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value.

[0070] Optionally, when it is determined that pre-cooling is not to be performed, a staged cooling strategy may be used for cooling to ensure that the energy storage system is within a normal operating temperature range.

[0071] Here, the highest temperature value in the local daytime temperature at the location of the energy storage system may also be the highest temperature value of the environment in which the energy storage system is operating. However, generally, energy storage systems are in operation during the day, and the highest temperature value is always during the day. Therefore, the highest temperature value in the local daytime temperature at the location of the energy storage system may be the highest temperature value of the environment in which the energy storage system is operating.

[0072] Step S103: If it is determined to perform pre-cooling, it is determined whether to start the liquid cooling unit to cool the energy storage system according to the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature.

[0073] It should be noted that the energy storage system may be charged at night. During the charging period, the control strategy of the liquid cooling unit still follows the staged cooling strategy. The pre-cooling judgment strategy in steps S101 to S103 can only be executed when the system is not in operation.

[0074] In the temperature control method of the above-mentioned energy storage system, the energy storage system can be pre-cooled according to the local temperature value and multiple temperature data of the battery cells, so as to achieve additional cooling of the energy storage system under low temperature conditions, reduce electric power, reduce electricity consumption, and improve cooling energy efficiency.

[0075] In step S102, whether to perform pre-cooling is determined based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value. The determination includes: if the highest temperature value of the local daytime temperature at the location of the energy storage system is greater than the preset maximum ambient temperature value, and the lowest temperature value is less than the preset minimum ambient temperature value, then determining to perform pre-cooling.

[0076] Here, the local daytime temperature is the real-time temperature within 24 hours every day.

[0077] Specifically, the temperature control method of the energy storage system also includes: if the local daytime temperature at the location of the energy storage system has a maximum temperature value less than or equal to a preset maximum ambient temperature value, or a minimum temperature value greater than or equal to a preset minimum ambient temperature value, then determining not to perform pre-cooling.

[0078] In this way, by judging whether the maximum ambient temperature is greater than the preset maximum ambient temperature value and judging whether the local daytime temperature is less than the preset minimum ambient temperature value, it is possible to determine whether the local ambient temperature difference is greater than the preset temperature difference value. When the local ambient temperature difference is greater than the ambient temperature difference required by this application, pre-cooling can be used to achieve the preset effect.

[0079] The pre-cooling reference temperature is determined by the following steps: obtaining the nighttime temperature energy efficiency ratio of the liquid-cooling unit of the energy storage system, the daytime temperature energy efficiency ratio of the liquid-cooling unit of the energy storage system, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price; determining a reference value based on the nighttime temperature energy efficiency ratio of the liquid-cooling unit of the energy storage system, the daytime temperature energy efficiency ratio of the liquid-cooling unit of the energy storage system, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price; and determining the pre-cooling reference temperature based on the reference value.

[0080] Specifically, the reference value is determined by the following formula:

[0081] ;

[0082] in, is the nighttime temperature energy efficiency ratio of the liquid-cooled unit; is the daytime temperature energy efficiency ratio of the liquid cooling unit; is the average temperature of the battery cell after pre-cooling; is the average temperature of the battery cell before pre-cooling; is the specific heat capacity of the battery cell; The nighttime electricity price; The daytime electricity price.

[0083] Here, this application makes a comprehensive judgment based on the cooling energy efficiency ratio between day and night, the battery core temperature, and the difference in electricity prices between day and night to ensure that the energy storage system adopts a pre-cooling strategy when the cooling energy efficiency is good and the cooling cost is low.

[0084] Specifically, determining the pre-cooling reference temperature according to the reference value includes: determining the pre-cooling reference temperature according to the reference value and a plurality of preset standard values.

[0085] For example, the pre-set multiple standard values may be 1, 1.2, etc. When the reference value is greater than 1.2, it can be confirmed that pre-cooling is effective in the current environment, and the pre-cooling reference temperature can be set to 10 degrees Celsius; when the reference value is greater than 1 and less than or equal to 1.2, it can be confirmed that pre-cooling is relatively effective in the current environment, and the pre-cooling reference temperature can be increased to 15 degrees Celsius; when the reference value is less than or equal to 1, it can be considered that the pre-cooling effect is poor, and pre-cooling can only achieve the expected effect when the average temperature of multiple battery cells is high, so the pre-cooling reference temperature can be increased to 20 degrees Celsius.

[0086] Here, the above standard values and reference values are only exemplary, and staff can make adaptive adjustments based on the actual environment and data of the energy storage system.

[0087] Optionally, when performing pre-cooling, the temperature control method of the energy storage system further includes: predicting a predicted maximum temperature of the electric cells for tomorrow based on the temperature predicted by the weather forecast and the heat generated by the electric cells during operation on the previous day; determining a predicted battery cell temperature of the energy storage system before pre-cooling is turned off based on the current pre-cooling power, the time when the energy storage system started operating on the previous day, and the current battery cell temperature; and determining whether it is necessary to increase the cooling power of the pre-cooling based on the predicted maximum temperature of the electric cells for tomorrow and the predicted battery cell temperature of the energy storage system before pre-cooling is turned off.

[0088] For example, when the predicted maximum cell temperature for tomorrow and the predicted cell temperature of the energy storage system before pre-cooling is turned off are both greater than the corresponding preset thresholds, the pre-cooling power needs to be increased to further reduce the cell temperature before the cell is turned on and further improve the pre-cooling effect.

[0089] Optionally, when pre-cooling is performed, after the step of determining the predicted battery cell temperature of the energy storage system before pre-cooling is turned off based on the current pre-cooling power, the time when the energy storage system started working the previous day, and the current battery cell temperature, the temperature control method of the energy storage system further includes: judging whether the predicted battery cell temperature is lower than a preset minimum battery cell temperature; if the predicted battery cell temperature is lower than the preset minimum battery cell temperature, reducing the pre-cooling power to avoid the battery cell temperature being too low due to pre-cooling, thereby causing damage to the battery cell.

[0090] Optionally, when adjusting the cooling power of pre-cooling, when the predicted battery cell temperature is lower than the preset battery cell minimum temperature, the cooling power can be controlled to be closer to the optimal operating power of the liquid cooling system. If cooling using the optimal operating power of the liquid cooling system will cause the battery cell temperature to be too low, pre-cooling will be stopped when the battery cell temperature drops to the preset battery cell minimum temperature.

[0091] Optionally, the temperature control method of the energy storage system also includes: obtaining the return temperature difference of the energy storage system battery cell; judging whether the current temperature is greater than the sum of the preset minimum ambient temperature value and the return temperature difference; if the current temperature is greater than the sum of the preset minimum ambient temperature value and the return temperature difference, continuing to start the liquid cooling unit; if the current temperature is less than or equal to the sum of the preset minimum ambient temperature value and the return temperature difference, shutting down the liquid cooling unit to complete the pre-cooling action.

[0092] Here, the temperature return difference of the battery cell is the difference between the highest and lowest temperatures of the battery cells in the energy storage system due to uneven temperature distribution of multiple battery cells.

[0093] For example, please refer to Figure 2 , after confirming that the energy storage system is not working, execute Figure 2 The flow chart shown in FIG. 1 is used to determine whether to pre-cool.

[0094] Please continue reading Figure 2 First, execute step S201 to obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, preset maximum ambient temperature value and preset minimum ambient temperature value of the energy storage system location.

[0095] Step S202: determine whether the maximum temperature value is greater than a preset maximum ambient temperature value.

[0096] If the maximum temperature value is less than or equal to the preset maximum ambient temperature value, the pre-cooling judgment process ends.

[0097] If the maximum temperature value is greater than the preset maximum value of the ambient temperature, the process proceeds to step S203 to determine whether the minimum temperature value is less than the preset minimum value of the ambient temperature.

[0098] If the minimum temperature value is greater than or equal to the preset minimum ambient temperature value, the pre-cooling judgment process ends.

[0099] If the minimum temperature value is lower than the preset minimum ambient temperature value, step S204 is executed to determine to perform pre-cooling and start the liquid cooling unit.

[0100] During the pre-cooling process, step S205 is executed to determine whether the average temperature of the plurality of battery cells is less than the pre-cooling reference temperature.

[0101] If the average temperature of multiple battery cells is lower than the pre-cooling reference temperature, the liquid cooling unit is turned off and pre-cooling is stopped.

[0102] If the average temperature of the plurality of battery cells is greater than or equal to the pre-cooling reference temperature, step S206 is executed to determine whether the current temperature is greater than the sum of the preset minimum ambient temperature value and the return temperature difference value.

[0103] If the current temperature is greater than the sum of the preset minimum ambient temperature and the return temperature difference, then step S204 is continued to perform the pre-cooling action.

[0104] If the current temperature is less than or equal to the sum of the preset minimum ambient temperature and the return temperature difference, step S207 is executed to shut down the liquid cooling unit.

[0105] In this way, by comprehensively considering multiple aspects such as the working status of the energy storage system, the temperature of the battery cells, the ambient temperature, the temperature return difference, and the electricity price, this application performs additional cooling on the energy storage system when the temperature is low and a comprehensive evaluation of the energy storage system is conducted. Performing additional cooling when the energy storage system is not working not only improves the cooling energy efficiency, but also reduces the consumption of electric power and electricity.

[0106] Optionally, the energy storage system can perform staged cooling when it is being charged or is not suitable for pre-cooling.

[0107] Specifically, the staged cooling method further includes: if the energy storage system is in an inoperative state, determining whether to perform pre-cooling; if the energy storage system is in an operational state, controlling the energy storage system to perform staged cooling.

[0108] Among them, controlling the energy storage system to perform staged cooling includes: judging whether the energy storage system needs staged cooling based on the maximum temperature of multiple battery cells and pre-set multi-stage battery cell temperature thresholds; if the energy storage system does not need staged cooling, controlling the liquid cooling unit to execute the self-circulation mode.

[0109] Specifically, the temperature control method of the energy storage system also includes: if the energy storage system requires graded cooling, determining the current required cooling level of the energy storage system based on the highest temperature of multiple battery cells and a preset multi-level battery cell temperature threshold; judging whether the current temperature is greater than a preset ambient temperature threshold; if the current temperature is less than or equal to the preset ambient temperature threshold, controlling the liquid cooling unit to perform cooling at the currently required cooling level; if the current temperature is greater than the preset ambient temperature threshold, controlling the liquid cooling unit to perform cooling at the next lower cooling level than the currently required cooling level.

[0110] The cooling capacity of the next refrigeration level is greater than the cooling capacity of the currently required refrigeration level.

[0111] Specifically, the temperature control method of the energy storage system also includes: obtaining the current cooling level of the energy storage system; judging whether the highest temperature of multiple battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and judging whether the current temperature is greater than a preset ambient temperature threshold; if the highest temperature of multiple battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and the current temperature is greater than the preset ambient temperature threshold, then controlling the liquid cooling unit to use the next two cooling levels for cooling.

[0112] Among them, the cooling capacity of the lower two refrigeration levels is greater than the cooling capacity of the next refrigeration level.

[0113] Optionally, the temperature control method of the energy storage system further includes: if the highest temperature of the multiple battery cells is less than or equal to the battery cell temperature threshold corresponding to the next cooling level, controlling the liquid cooling unit to maintain the current cooling level for cooling.

[0114] Here, when the energy storage system is operating normally, the appropriate cooling level of the energy storage system is determined based on the battery cell temperature and the current ambient temperature, and the energy storage system is cooled in stages according to the appropriate cooling level to meet the different cooling requirements of the energy storage system under normal working conditions and achieve multi-level precise cooling of the energy storage system.

[0115] For example, see Figure 3 , Figure 3 A schematic diagram of a process for controlling an energy storage system to perform staged cooling is shown.

[0116] For example, Figure 3 As shown in , when controlling the energy storage system to perform staged cooling, step S301 is first executed to determine whether the maximum temperature of the battery cell is greater than a preset first-level battery cell temperature threshold.

[0117] If the highest temperature of the battery cell is less than or equal to the preset first-level battery cell temperature threshold, step S310 is executed to adopt the self-circulation mode for cooling.

[0118] If the highest temperature of the battery cell is greater than the preset first-level battery cell temperature threshold, step S302 is executed to determine whether the current ambient temperature is greater than the preset ambient temperature threshold.

[0119] If the current ambient temperature is greater than the preset ambient temperature threshold, step S306 is executed to adopt the second-level cooling mode.

[0120] Here, when both the ambient temperature and the battery cell temperature are high, cross-stage cooling is directly performed, which can cool the battery cell faster and avoid battery cell overheating incidents caused by untimely cooling.

[0121] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, step S303 is executed to adopt the first-level cooling mode.

[0122] After executing step S303 , step S304 is executed to determine whether the maximum temperature of the battery cell is greater than a preset second-level battery cell temperature threshold.

[0123] If the highest temperature of the battery cell is less than or equal to the preset second-level battery cell temperature threshold, the process continues with step S304 to adopt the first-level cooling mode.

[0124] If the highest temperature of the battery cell is greater than the preset second-level battery cell temperature threshold, step S305 is executed to determine whether the current ambient temperature is greater than the preset ambient temperature threshold.

[0125] If the current ambient temperature is greater than the preset ambient temperature threshold, step S309 is executed to adopt the third level cooling mode.

[0126] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, step S306 is executed to adopt the second-level cooling mode.

[0127] After executing step S306 , step S307 is executed to determine whether the maximum temperature of the battery cell is greater than a preset third-level battery cell temperature threshold.

[0128] If the highest temperature of the battery cell is less than or equal to the preset third-level battery cell temperature threshold, step S306 is executed to adopt the second-level cooling mode.

[0129] If the highest temperature of the battery cell is greater than the preset third-level battery cell temperature threshold, step S308 is executed to determine whether the current ambient temperature is greater than the preset ambient temperature threshold.

[0130] If the current ambient temperature is greater than the preset ambient temperature threshold, the liquid cooling unit should be controlled to adopt the fourth stage cooling mode (not shown in the figure).

[0131] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, step S309 is executed to adopt the third level cooling mode.

[0132] Here, it should be noted that after step S309, the battery cell temperature threshold judgment and ambient temperature judgment of level four, level five, level six, etc. can also be performed. When the maximum battery cell temperature and the ambient temperature are both greater than the corresponding thresholds, cross-level cooling is required. When the maximum battery cell temperature cannot reach the next level battery cell temperature threshold, the current cooling level is continued to be maintained for cooling.

[0133] In this way, according to the battery cell temperature and the current ambient temperature, the appropriate cooling level of the energy storage system can be determined under normal working conditions, and the energy storage system can be cooled according to the appropriate cooling level to meet the different cooling requirements of the energy storage system under normal working conditions and achieve the effect of precise cooling of the energy storage system.

[0134] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0135] Based on the same inventive concept, embodiments of the present application also provide a temperature control device for an energy storage system for implementing the aforementioned temperature control method for an energy storage system. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the temperature control device for an energy storage system provided below can be found in the aforementioned limitations of the temperature control method for an energy storage system, and will not be further elaborated here.

[0136] Please refer to Figure 4 In an exemplary embodiment, a temperature control device for an energy storage system is provided. The temperature control device for the energy storage system includes a data acquisition module 20, a pre-cooling judgment module 30, and a pre-cooling starting module 40. The data acquisition module 20 is used to obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, a preset maximum ambient temperature value, and a preset minimum ambient temperature value at the location of the energy storage system when the energy storage system is not in operation; the pre-cooling judgment module 30 is used to determine whether to perform pre-cooling based on the maximum temperature value of the local daytime temperature at the location of the energy storage system, the minimum temperature value of the local daytime temperature at the location of the energy storage system, the preset maximum ambient temperature value, and the preset minimum ambient temperature value; the pre-cooling starting module 40 is used to determine whether to start the liquid cooling unit to cool the energy storage system based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature if pre-cooling is determined to be performed.

[0137] In some embodiments, the pre-cooling judgment module is specifically used to determine whether to perform pre-cooling if the highest temperature value of the local daytime temperature at the location of the energy storage system is greater than a preset maximum ambient temperature value and the lowest temperature value of the local daytime temperature at the location of the energy storage system is less than a preset minimum ambient temperature value.

[0138] In some embodiments, the pre-cooling judgment module is further used to: determine not to perform pre-cooling if the local daytime temperature at the location of the energy storage system is such that the highest temperature value is less than or equal to a preset maximum ambient temperature value, or the lowest temperature value is greater than or equal to a preset minimum ambient temperature value.

[0139] In some embodiments, the pre-cooling judgment module includes a pre-cooling reference temperature determination unit, which is used to perform the following steps: obtaining the nighttime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the daytime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price; determining a reference value based on the nighttime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the daytime temperature energy efficiency ratio of the energy storage system liquid cooling unit, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price; and determining the pre-cooling reference temperature based on the reference value.

[0140] In some embodiments, the pre-cooling reference temperature determining unit determines the reference value by the following formula:

[0141] ;

[0142] in, is the nighttime temperature energy efficiency ratio of the liquid-cooled unit; is the daytime temperature energy efficiency ratio of the liquid cooling unit; is the average temperature of the battery cell after pre-cooling; is the average temperature of the battery cell before pre-cooling; is the specific heat capacity of the battery cell; The nighttime electricity price; The daytime electricity price.

[0143] In some embodiments, the pre-cooling reference temperature determining unit is specifically configured to determine the pre-cooling reference temperature according to a reference value and a plurality of preset standard values.

[0144] In some embodiments, the temperature control device of the energy storage system further includes:

[0145] A pre-cooling determination module is used to determine whether to perform pre-cooling if the energy storage system is in an inoperative state;

[0146] The staged cooling determination module is used to control the energy storage system to perform staged cooling if the energy storage system is in a working state.

[0147] In some embodiments, the graded cooling determination module is specifically used to determine whether the energy storage system needs graded cooling based on the maximum temperature of multiple battery cells and a pre-set multi-stage battery cell temperature threshold; if the energy storage system does not need graded cooling, the liquid cooling unit is controlled to execute the self-circulation mode.

[0148] In some embodiments, the graded cooling determination module is further used to: if graded cooling is required, determine the current required cooling level of the energy storage system based on the maximum temperature of the battery cell and the preset multi-level battery cell temperature threshold; determine whether the current temperature is greater than the preset ambient temperature threshold; if the current temperature is less than or equal to the preset ambient temperature threshold, control the liquid cooling unit to cool at the currently required cooling level; if the current temperature is greater than the preset ambient temperature threshold, control the liquid cooling unit to cool at the next cooling level below the currently required cooling level; wherein the cooling capacity of the next cooling level is greater than the cooling capacity of the currently required cooling level.

[0149] In some embodiments, the graded cooling determination module is further used to obtain the current cooling level of the energy storage system; determine whether the maximum temperature of multiple battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and determine whether the current temperature is greater than the preset ambient temperature threshold; if the maximum temperature of multiple battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and the current temperature is greater than the preset ambient temperature threshold, then control the liquid cooling unit to use the next two cooling levels for cooling; wherein the cooling capacity of the next two cooling levels is greater than the cooling capacity of the next cooling level.

[0150] In some embodiments, the graded cooling determination module is further used to: if the highest temperature of the multiple battery cells is less than or equal to the battery cell temperature threshold corresponding to the next cooling level, control the liquid cooling unit to maintain the current cooling level for cooling.

[0151] Each module in the temperature control device of the energy storage system described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0152] In an exemplary embodiment, a computer device is provided, which may be a terminal. The computer device includes a processor, memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and computer program stored in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via wired or wireless communication, which may be achieved via Wi-Fi, a mobile cellular network, near-field communication (NFC), or other technologies. When executed by the processor, the computer program implements a temperature control method for an energy storage system. The display unit of the computer device is used to produce a visual image and may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device casing, or an external keyboard, touchpad or mouse.

[0153] Those skilled in the art will understand that Figure 5 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. Specifically, the computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0154] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0155] When the energy storage system is not in operation, obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, preset maximum ambient temperature value, and preset minimum ambient temperature value;

[0156] Determining whether to perform pre-cooling based on the highest temperature value among the local daytime temperatures at the location of the energy storage system, the lowest temperature value among the local daytime temperatures at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value;

[0157] If pre-cooling is determined, whether to start the liquid cooling unit to cool the energy storage system is determined based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature;

[0158] The determination of whether to perform pre-cooling is made based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value, including:

[0159] If the local daytime temperature at the location of the energy storage system is higher than the preset maximum ambient temperature and lower than the preset minimum ambient temperature, pre-cooling is performed.

[0160] The local daytime temperature is the real-time temperature within 24 hours every day.

[0161] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0162] When the energy storage system is not in operation, obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, preset maximum ambient temperature value, and preset minimum ambient temperature value;

[0163] Determining whether to perform pre-cooling based on the highest temperature value among the local daytime temperatures at the location of the energy storage system, the lowest temperature value among the local daytime temperatures at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value;

[0164] If pre-cooling is determined, whether to start the liquid cooling unit to cool the energy storage system is determined based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature;

[0165] The determination of whether to perform pre-cooling is made based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value, including:

[0166] If the local daytime temperature at the location of the energy storage system is higher than the preset maximum ambient temperature and lower than the preset minimum ambient temperature, pre-cooling is performed.

[0167] The local daytime temperature is the real-time temperature within 24 hours every day.

[0168] In some embodiments, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0169] When the energy storage system is not in operation, obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, preset maximum ambient temperature value, and preset minimum ambient temperature value;

[0170] Determining whether to perform pre-cooling based on the highest temperature value among the local daytime temperatures at the location of the energy storage system, the lowest temperature value among the local daytime temperatures at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value;

[0171] If pre-cooling is determined, whether to start the liquid cooling unit to cool the energy storage system is determined based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature;

[0172] The determination of whether to perform pre-cooling is made based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value, including:

[0173] If the local daytime temperature at the location of the energy storage system is higher than the preset maximum ambient temperature and lower than the preset minimum ambient temperature, pre-cooling is performed.

[0174] The local daytime temperature is the real-time temperature within 24 hours every day.

[0175] In some embodiments, an energy storage system is provided, comprising: a battery pack, a management subsystem, an energy storage converter, and a thermal management subsystem, wherein the thermal management subsystem is configured to execute the steps of the temperature control method for the energy storage system in any of the above embodiments.

[0176] In some embodiments, an electrical device is provided, comprising the temperature control device of the energy storage system in any of the above embodiments.

[0177] The temperature control method, device, energy storage system, and electrical equipment of the above-mentioned energy storage system can pre-cool the energy storage system based on the local temperature value and multiple temperature data of the battery cells, thereby achieving additional cooling of the energy storage system under low temperature conditions, reducing electrical power, lowering power consumption, and improving cooling energy efficiency.

[0178] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0179] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0180] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present application, and all such modifications and improvements fall within the scope of protection of the present application.

Claims

1. A temperature control method for an energy storage system, characterized in that: include: When the energy storage system is not in operation, obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, preset maximum ambient temperature value, and preset minimum ambient temperature value of the energy storage system location; Determining whether to perform pre-cooling based on a maximum temperature value among the local daytime temperatures at the location of the energy storage system, a minimum temperature value among the local daytime temperatures at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value; If pre-cooling is determined, determining whether to start a liquid cooling unit to cool the energy storage system based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature; The method of determining whether to perform pre-cooling according to the maximum temperature value of the local daytime temperature at the location of the energy storage system, the minimum temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value includes: If the local daytime temperature at the location of the energy storage system is such that the highest temperature value is greater than the preset highest ambient temperature value, and the lowest temperature value is less than the preset lowest ambient temperature value, then it is determined to perform pre-cooling; The local daytime temperature is the real-time temperature within 24 hours every day.

2. The temperature control method of the energy storage system according to claim 1, characterized in that: Also includes: If the local daytime temperature at the location of the energy storage system has a maximum temperature value less than or equal to a preset maximum ambient temperature value, or a minimum temperature value greater than or equal to a preset minimum ambient temperature value, it is determined that pre-cooling is not performed.

3. The temperature control method of the energy storage system according to claim 1, characterized in that: Determine the pre-cooling reference temperature of the liquid cooling unit by the following steps: Obtaining the nighttime temperature energy efficiency ratio, daytime temperature energy efficiency ratio, average temperature of the battery cells before pre-cooling, average temperature of the battery cells after pre-cooling, specific heat capacity of the battery cells, daytime electricity price, and nighttime electricity price of the liquid cooling unit; Determining a reference value of the liquid cooling unit according to the nighttime temperature energy efficiency ratio, the daytime temperature energy efficiency ratio, the average temperature of the battery cells before pre-cooling, the average temperature of the battery cells after pre-cooling, the specific heat capacity of the battery cells, the daytime electricity price, and the nighttime electricity price; The pre-cooling reference temperature is determined according to the reference value.

4. The temperature control method of the energy storage system according to claim 3, characterized in that: The reference value is determined by the following formula: ； in, is the nighttime temperature energy efficiency ratio of the liquid cooling unit; is the daytime temperature energy efficiency ratio of the liquid cooling unit; is the average temperature of the battery cell after pre-cooling; is the average temperature of the battery cell before pre-cooling; is the specific heat capacity of the battery cell; is the nighttime electricity price; is the daytime electricity price.

5. The temperature control method of the energy storage system according to claim 3, characterized in that: Determining the pre-cooling reference temperature according to the reference value includes: The pre-cooling reference temperature is determined according to the reference value and a plurality of preset standard values.

6. The temperature control method of the energy storage system according to claim 1, characterized in that: The method further comprises: If the energy storage system is in an inoperative state, determining whether to perform pre-cooling; If the energy storage system is in working state, the energy storage system is controlled to perform staged cooling.

7. The temperature control method of the energy storage system according to claim 6, characterized in that: Controlling the energy storage system to perform staged refrigeration includes: Determining whether the energy storage system needs to perform graded cooling based on the highest temperature of the multiple battery cells and a preset multi-level battery cell temperature threshold; If the energy storage system does not need to perform staged refrigeration, the liquid cooling unit is controlled to execute a self-circulation mode.

8. The temperature control method of the energy storage system according to claim 7, characterized in that: Also includes: If the energy storage system requires graded cooling, determining the current required cooling level of the energy storage system according to the highest temperature of the multiple battery cells and the preset multi-level battery cell temperature threshold; Determining whether the current temperature at the location of the energy storage system is greater than a preset ambient temperature threshold; If the current temperature is less than or equal to the preset ambient temperature threshold, controlling the liquid cooling unit to perform cooling at the currently required cooling level; If the current temperature is greater than the preset ambient temperature threshold, controlling the liquid cooling unit to perform cooling at a refrigeration level lower than the currently required refrigeration level; The cooling capacity of the next refrigeration level is greater than the cooling capacity of the currently required refrigeration level.

9. The temperature control method of the energy storage system according to claim 8, characterized in that: include: Obtaining a current cooling level of the energy storage system; Determining whether the highest temperature of the plurality of battery cells is greater than a battery cell temperature threshold corresponding to the next cooling level, and determining whether the current temperature is greater than a preset ambient temperature threshold; If the highest temperature of the plurality of battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, and the current temperature is greater than the preset ambient temperature threshold, controlling the liquid cooling unit to adopt the next two cooling levels for cooling; The cooling capacity of the two lower refrigeration levels is greater than the cooling capacity of the next lower refrigeration level.

10. The temperature control method of the energy storage system according to claim 9, characterized in that: Also includes: If the highest temperature of the plurality of battery cells is less than or equal to the battery cell temperature threshold corresponding to the next cooling level, the liquid cooling unit is controlled to maintain the current cooling level for cooling.

11. A temperature control device for an energy storage system, characterized in that: include: A data acquisition module is used to obtain the local daytime temperature, current temperature, average temperature of multiple battery cells, pre-cooling reference temperature, maximum operating temperature of the energy storage system during charging and discharging, preset maximum ambient temperature value, and preset minimum ambient temperature value of the energy storage system when the energy storage system is not in operation; a pre-cooling judgment module, configured to judge whether to perform pre-cooling based on the highest temperature value of the local daytime temperature at the location of the energy storage system, the lowest temperature value of the local daytime temperature at the location of the energy storage system, a preset maximum ambient temperature value, and a preset minimum ambient temperature value; A pre-cooling start module is used to determine whether to start a liquid cooling unit to cool the energy storage system based on the current temperature, the average temperature of multiple battery cells in the energy storage system, and the pre-cooling reference temperature if pre-cooling is determined; The pre-cooling judgment module is specifically configured to determine to perform pre-cooling if the local daytime temperature at the location of the energy storage system is higher than a preset maximum ambient temperature and lower than a preset minimum ambient temperature. The local daytime temperature is the real-time temperature within 24 hours every day.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the temperature control method according to any one of claims 1 to 10 are implemented.

13. An energy storage system, characterized in that: include: Battery pack; Management subsystem; Energy storage converter; A thermal management subsystem, configured to execute the steps of the temperature control method according to any one of claims 1 to 10.

14. An electrical device, characterized in that: A temperature control device for an energy storage system comprising the device of claim 11.

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