Liquid cooling control method and device of energy storage system, energy storage system and electric equipment

Abstract

The invention relates to the technical field of energy storage, and provides a liquid cooling control method and device of an energy storage system, the energy storage system and electric equipment. The liquid cooling control method of the energy storage system comprises the following steps: judging whether the energy storage system is in a heat quick release stage or not according to the working state of the energy storage system and the residual electric quantity of the energy storage system; if the energy storage system is not in the heat quick release stage, executing a liquid cooling hierarchical control strategy; and if the energy storage system is in the heat quick release stage, the quick refrigeration control strategy is executed, and the energy storage system can be quickly and effectively cooled at least under the condition that it can be ensured that the energy storage system is within the reasonable temperature range.

Description

Technical Field

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

[0002] An energy storage system stores energy through a medium or device and releases energy when needed. The energy storage system helps to solve the problem of spatio-temporal differences in energy supply and demand and can improve the stability of the power system.

[0003] In related technologies, the cooling of an energy storage system is one of the important research topics of the energy storage system. How to effectively control the temperature of the energy storage system while ensuring that the energy storage system battery cells are at the target operating temperature is one of the technical problems that technicians urgently need to solve. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide a liquid cooling control method, device, energy storage system and electrical equipment for an energy storage system, which can at least determine the heat release rate according to the working state and remaining power of the energy storage system, and then control the liquid cooling strategy according to the heat release rate to ensure that the energy storage system is quickly and effectively cooled while the energy storage system is within a reasonable temperature range.

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

[0006] Judging whether the energy storage system is in a rapid heat release stage according to the working state of the energy storage system and the remaining power of the energy storage system;

[0007] If the energy storage system is not in a rapid heat release stage, controlling the energy storage system to execute a liquid cooling hierarchical control strategy;

[0008] If the energy storage system is in a rapid heat release stage, controlling the energy storage system to execute a rapid refrigeration control strategy;

[0009] Wherein, the rapid refrigeration control strategy includes:

[0010] Calculating a temperature change rate according to the average temperature of the battery cells at a first target time of the energy storage system, the average temperature of the battery cells at a second target time, and a preset interval time, where the preset interval time is the time difference between the first target time and the second target time;

[0011] Judging whether the energy storage system needs to perform rapid refrigeration according to the temperature change rate and a preset temperature change rate threshold.

[0012] In some of these embodiments, the liquid cooling control method for the energy storage system further includes:

[0013] Obtain the pressure data of the liquid cooling unit in the energy storage system;

[0014] Determine whether the liquid cooling unit of the energy storage system is in the maximum load state according to the pressure data of the liquid cooling unit of the energy storage system;

[0015] If the liquid cooling unit of the energy storage system is in the maximum load state, determine the maximum cooling state of the liquid cooling unit as the current cooling state.

[0016] In some embodiments, the liquid cooling hierarchical control strategy includes:

[0017] Judge whether the energy storage system needs hierarchical cooling according to the highest temperature of the battery cells in the energy storage system and the preset multi-level battery cell temperature thresholds;

[0018] If hierarchical cooling is not required, control the liquid cooling unit to adopt the self-circulation mode.

[0019] In some embodiments, the liquid cooling control method of the energy storage system further includes:

[0020] If the energy storage system needs hierarchical cooling, determine the current required cooling level of the energy storage system according to the highest temperature of the battery cells and the preset multi-level battery cell temperature thresholds;

[0021] Judge whether the current ambient temperature is greater than the preset ambient temperature threshold;

[0022] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, control the energy storage system to cool at the current required cooling level;

[0023] If the current ambient temperature is greater than the preset ambient temperature threshold, control the energy storage system to cool at the next lower cooling level of the current required cooling level;

[0024] Wherein, the cooling capacity of the next lower cooling level is greater than the cooling capacity of the current required cooling level.

[0025] In some embodiments, the liquid cooling control method of the energy storage system further includes:

[0026] Obtain the current cooling level of the energy storage system;

[0027] Judge whether the highest temperature of the battery cells in the energy storage system is greater than the battery cell temperature threshold corresponding to the next lower cooling level, and judge whether the current ambient temperature is greater than the preset ambient temperature threshold;

[0028] If the highest temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next lower cooling level, and the current ambient temperature is greater than the preset ambient temperature threshold, control the energy storage system to cool at the next lower cooling level.

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

[0030] If the highest temperature of the battery cell is less than or equal to the battery cell temperature threshold corresponding to the next-level refrigeration level, or the current ambient temperature is less than or equal to the preset ambient temperature threshold, then control the energy storage system to maintain the current refrigeration level for refrigeration.

[0031] In some of these embodiments, determining whether the energy storage system is in the rapid heat release stage according to the working state of the energy storage system and the remaining power of the energy storage system includes:

[0032] If the working state of the energy storage system is the discharging working state and the remaining power of the energy storage system is less than the preset first power, then determine that the energy storage system is in the rapid heat release stage;

[0033] If the working state of the energy storage system is the non-discharging working state, or the remaining power of the energy storage system is less than the preset first power, then determine that the energy storage system is not in the rapid heat release stage.

[0034] In some of these embodiments, the rapid refrigeration control strategy further includes:

[0035] If the energy storage system needs to perform rapid refrigeration, then control the energy storage system to refrigerate at the next-level refrigeration level of the current required refrigeration level;

[0036] If the energy storage system does not need to perform rapid refrigeration, then control the energy storage system to maintain the current refrigeration level.

[0037] In some of these embodiments, it further includes:

[0038] Obtain the current refrigeration level of the energy storage system;

[0039] Judge whether the highest temperature of the battery cell in the energy storage system is greater than the battery cell temperature threshold corresponding to the next-level refrigeration level;

[0040] If the highest temperature of the battery cell is greater than the battery cell temperature threshold corresponding to the next-level refrigeration level, then control the energy storage system to refrigerate at the next-level refrigeration level.

[0041] In some of these embodiments, the temperature change rate is calculated by the following formula:

[0042] ;

[0043] Wherein, is the average temperature at the first target time, is the average temperature at the second target time, t is the preset interval time, is the temperature change rate, is the first target time, is the second target time.

[0044] In a second aspect, an embodiment of the present application further provides a liquid cooling control device for an energy storage system, including a heat release rate determination module, a liquid cooling hierarchical control module, and a rapid refrigeration control module. The heat release rate determination module is configured to determine whether the energy storage system is in a rapid heat release stage according to the working state of the energy storage system and the remaining power of the energy storage system.

[0045] The liquid cooling hierarchical control module is configured to control the energy storage system to execute a liquid cooling hierarchical control strategy if the energy storage system is not in a rapid heat release stage.

[0046] The rapid refrigeration control module is configured to control the energy storage system to execute a rapid refrigeration control strategy if the energy storage system is in a rapid heat release stage.

[0047] In a third aspect, an embodiment of the present application further provides a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0048] Determine whether the energy storage system is in a rapid heat release stage according to the working state of the energy storage system and the remaining power of the energy storage system;

[0049] If the energy storage system is not in a rapid heat release stage, control the energy storage system to execute a liquid cooling hierarchical control strategy;

[0050] If the energy storage system is in a rapid heat release stage, control the energy storage system to execute a rapid refrigeration control strategy.

[0051] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0052] Determine whether the energy storage system is in a rapid heat release stage according to the working state of the energy storage system and the remaining power of the energy storage system;

[0053] If the energy storage system is not in a rapid heat release stage, control the energy storage system to execute a liquid cooling hierarchical control strategy;

[0054] If the energy storage system is in a rapid heat release stage, control the energy storage system to execute a rapid refrigeration control strategy.

[0055] In a fourth aspect, an embodiment of the present application further provides an energy storage system, including: a battery pack, a management subsystem, an energy storage inverter, and a thermal management subsystem. The thermal management subsystem is configured to execute the steps of the liquid cooling control method for the energy storage system in any of the above embodiments.

[0056] Fifth aspect, an embodiment of the present application further provides an electrical device, which includes the liquid cooling control device of the energy storage system in any of the above embodiments.

[0057] The above-mentioned liquid cooling control method, device, energy storage system and electrical device of the energy storage system determine the heat release rate according to the working state and remaining power of the energy storage system, and then perform liquid cooling strategy control according to the heat release rate to ensure that the energy storage system is quickly and effectively cooled under the condition that the energy storage system is within a reasonable temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for description in the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0059] Figure 1 It is a schematic flowchart of a liquid cooling control method for an energy storage system in an embodiment;

[0060] Figure 2 It is a schematic flowchart of a fast cooling control strategy for an energy storage system in another embodiment;

[0061] Figure 3 It is a schematic flowchart of a liquid cooling hierarchical control strategy for an energy storage system in yet another embodiment;

[0062] Figure 4 It is a schematic structural diagram of a liquid cooling control device for an energy storage system in an embodiment;

[0063] Figure 5 It is a schematic internal structure diagram of a computer device in an embodiment.

[0064] Reference Signs and Descriptions:

[0065] 20. Heat release rate judgment module; 30. Liquid cooling hierarchical control module; 40. Fast cooling control module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0066] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0067] Please refer to Figure 1 , in an exemplary embodiment, a liquid cooling control method for an energy storage system is provided, including the following steps S101 to step S103. Among them:

[0068] Step S101: Determine whether the energy storage system is in the stage of rapid heat release according to the working state of the energy storage system and the remaining power of the energy storage system.

[0069] Specifically, determining whether the energy storage system is in the stage of rapid heat release according to the working state of the energy storage system and the remaining power of the energy storage system includes: determining whether the working state of the energy storage system is a discharging working state, and determining whether the remaining power of the energy storage system is less than a preset first power; if the working state of the energy storage system is a discharging working state and the remaining power of the energy storage system is less than the preset first power, it is determined that the energy storage system is in the stage of rapid heat release; if the working state of the energy storage system is a non-discharging working state, or the remaining power of the energy storage system is less than the preset first power, it is determined that the energy storage system is not in the stage of rapid heat release.

[0070] Exemplarily, the preset first power can be nine percent, ten percent, eleven percent, etc. of the overall power of the energy storage system.

[0071] Step S102: If the energy storage system is not in the stage of rapid heat release, control the energy storage system to execute the liquid cooling hierarchical control strategy.

[0072] Step S103: If the energy storage system is in the stage of rapid heat release, control the energy storage system to execute the rapid refrigeration control strategy.

[0073] In the above liquid cooling control method of the energy storage system, according to the working state and the remaining power of the energy storage system, the heat release rate is determined, and then according to the heat release rate, the liquid cooling strategy is controlled to ensure that the energy storage system is quickly and effectively cooled under the condition that the energy storage system is within a reasonable temperature range.

[0074] Optionally, the liquid cooling control method of the energy storage system further includes: obtaining the pressure data of the liquid cooling unit of the energy storage system; determining whether the liquid cooling unit of the energy storage system is in the maximum load state according to the pressure data of the liquid cooling unit in the energy storage system; if the liquid cooling unit of the energy storage system is in the maximum load state, determining that the maximum refrigeration state of the liquid cooling unit is the current refrigeration state.

[0075] Among them, the pressure data of the liquid cooling unit can be the real-time monitoring value of the system circulation pressure, the pressure difference between the liquid supply and the liquid return, the node hydraulic fluctuation frequency, or the system work pressure value, etc.

[0076] As an example, the working pressure of the main circulation pipeline of the liquid cooling unit can be collected through a pressure sensor. When the pressure value exceeds the design pressure upper limit of the liquid cooling unit (such as exceeding 85%-90% of the rated value), it indicates that the system may be in a maximum load state; the pressure difference change between the liquid supply end and the liquid return end can be detected. If the pressure difference increases significantly (such as exceeding the set threshold by 15-20%), it indicates that the system may be in a maximum load state; the work power of the liquid cooling system can be calculated to see whether it exceeds the design power pressure upper limit of the liquid cooling unit (such as exceeding 85%-90% of the rated value), which indicates that the system may be in a maximum load state.

[0077] In this way, it is ensured that the liquid cooling unit will not be damaged when it is controlled. That is to say, when the refrigeration capacity of the condenser of the liquid cooling unit is insufficient to meet the refrigeration cycle requirements of the liquid cooling unit, continuing to increase the refrigeration power may cause damage to the liquid cooling unit. Therefore, in this case, no matter what control strategy of the present application is adopted, the energy storage system will not enter the next level of refrigeration state to avoid irreversible damage or damage to the liquid cooling unit.

[0078] Specifically, the liquid cooling graded control strategy includes: judging whether the energy storage system needs graded cooling based on the maximum temperature of the battery cells in the energy storage system and the pre-set multi-level battery cell temperature threshold; if graded cooling is not required, controlling the liquid cooling unit to adopt the self-circulation mode.

[0079] Here, the self-circulation mode means that the compressor, fan and positive temperature coefficient (PTC) heater are all turned off, and only the water pump is kept running to drive the coolant to circulate between the battery pack liquid cold plate and the unit, relying on natural convection and heat conduction of the fluid to remove local heat.

[0080] The liquid cooling control method of the energy storage system also includes: if the energy storage system needs to perform graded cooling, determining the current required cooling level of the energy storage system according to the maximum temperature of the battery cell and the pre-set multi-level battery cell temperature threshold; judging whether the current ambient temperature is greater than the preset ambient temperature threshold; if the current ambient temperature is less than or equal to the preset ambient temperature threshold, controlling the energy storage system to perform cooling at the currently required cooling level; if the current ambient temperature is greater than the preset ambient temperature threshold, controlling the energy storage system to perform cooling at the next cooling level of the currently required cooling level.

[0081] Among them, the cooling capacity of the next refrigeration level is greater than the cooling capacity of the previous refrigeration level.

[0082] The ambient temperature threshold may be 45°C-55°C.

[0083] As an example, the ambient temperature threshold may be 45°C, 47°C, 50°C, 53°C, 55°C, and so on.

[0084] Specifically, the liquid cooling control method for the energy storage system further includes: obtaining the current refrigeration level of the energy storage system; determining whether the highest temperature of the battery cells in the energy storage system is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, and determining whether the current ambient temperature is greater than the preset ambient temperature threshold; if the highest temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, and the current ambient temperature is greater than the preset ambient temperature threshold, then control the energy storage system to perform refrigeration using the next lower refrigeration level.

[0085] Among them, the liquid cooling control method for the energy storage system further includes: if the highest temperature of the battery cells is less than or equal to the battery cell temperature threshold corresponding to the next lower refrigeration level, or the current ambient temperature is less than or equal to the preset ambient temperature threshold, then control the energy storage system to maintain the current refrigeration level for refrigeration.

[0086] Exemplarily, please refer to Figure 3 , Figure 3 which shows a schematic flow diagram of the liquid cooling hierarchical control strategy.

[0087] Exemplarily, as shown in Figure 3 in, for the liquid cooling hierarchical control strategy, first perform step S301 to determine whether the highest temperature of the battery cells is greater than the first-level battery cell temperature threshold set in advance.

[0088] If the highest temperature of the battery cells is less than or equal to the first-level battery cell temperature threshold set in advance, then perform step S310 to perform refrigeration in the self-circulation mode.

[0089] If the highest temperature of the battery cells is greater than the first-level battery cell temperature threshold set in advance, then perform step S302 to determine whether the current ambient temperature is greater than the preset ambient temperature threshold.

[0090] If the current ambient temperature is greater than the preset ambient temperature threshold, then perform step S306 to adopt the second-level refrigeration mode.

[0091] Here, when both the ambient temperature and the battery cell temperature are relatively high, direct cross-level refrigeration can be carried out to cool the battery cells faster and avoid overheating of the battery cells due to untimely cooling.

[0092] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, then perform step S303 to adopt the first-level refrigeration mode.

[0093] After performing step S303, perform step S304 to determine whether the highest temperature of the battery cells is greater than the second-level battery cell temperature threshold set in advance.

[0094] If the highest temperature of the battery cells is less than or equal to the second-level battery cell temperature threshold set in advance, then continue to perform step S304 to adopt the first-level refrigeration mode.

[0095] If the maximum temperature of the battery cell is greater than the preset second-level battery cell temperature threshold, then step S305 is executed to determine whether the current ambient temperature is greater than the preset ambient temperature threshold.

[0096] If the current ambient temperature is greater than the preset ambient temperature threshold, then step S309 is executed to adopt the third-level refrigeration mode.

[0097] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, then step S306 is executed to adopt the second-level refrigeration mode.

[0098] After step S306 is executed, step S307 is executed to determine whether the maximum temperature of the battery cell is greater than the preset third-level battery cell temperature threshold.

[0099] If the maximum temperature of the battery cell is less than or equal to the preset third-level battery cell temperature threshold, then step S306 is executed to adopt the second-level refrigeration mode.

[0100] If the maximum temperature of the battery cell is greater than the preset third-level battery cell temperature threshold, then step S308 is executed to determine whether the current ambient temperature is greater than the preset ambient temperature threshold.

[0101] If the current ambient temperature is greater than the preset ambient temperature threshold, the liquid cooling unit should be controlled to adopt the fourth-level refrigeration mode (not shown in the figure).

[0102] If the current ambient temperature is less than or equal to the preset ambient temperature threshold, then step S309 is executed to adopt the third-level refrigeration mode.

[0103] Here, it should be noted that after step S309, the battery cell temperature threshold judgment and ambient temperature judgment of four levels, five levels, six levels, etc. can also be carried out. When both the maximum temperature of the battery cell and the ambient temperature are greater than the corresponding thresholds, cross-level cooling is required. When the maximum temperature of the battery cell cannot reach the next-level battery cell temperature threshold, the current refrigeration level should continue to be maintained for refrigeration.

[0104] Among them, the refrigeration mode of the energy storage system can be divided into 3 levels, 4 levels, 5 levels, 7 levels, etc.

[0105] Among them, the first-level battery cell temperature threshold can be 22°C - 25°C, and the last-level battery cell temperature threshold can be 35°C - 38°C.

[0106] As an example, the first-level battery cell temperature threshold can be 22°C, 23°C, 24°C, 25°C, etc., and the last-level battery cell temperature threshold can be 35°C, 36°C, 37°C, 38°C, etc.

[0107] Here, according to the selected refrigeration level number, the first-stage cell temperature threshold, and the last-stage cell temperature threshold by the staff, an equal difference distribution can be made among multiple refrigeration levels between the first-stage cell temperature threshold and the last-stage cell temperature threshold to determine the cell temperature threshold corresponding to each refrigeration level.

[0108] In this way, in the liquid cooling hierarchical control strategy of the present application, according to the cell temperature and the current ambient temperature, the appropriate refrigeration level of the energy storage system is determined, and the energy storage system is cooled according to the appropriate refrigeration level, meeting the different refrigeration requirements of the energy storage system in the normal working state, and achieving the effect of accurately cooling the energy storage system.

[0109] Optionally, in the liquid cooling hierarchical control strategy, it further includes: determining whether the current cell temperature is between the two cell temperature thresholds corresponding to the two liquid cooling levels;

[0110] If the current cell temperature is between the two cell temperature thresholds corresponding to the two liquid cooling levels, the refrigeration level is determined as the smallest refrigeration level among the two liquid cooling levels.

[0111] In this way, it is convenient for the liquid cooling control strategy to find the refrigeration level corresponding to the current cell temperature more quickly.

[0112] Optionally, every preset time interval, or when the cell temperature drops to a preset low temperature threshold, the refrigeration level is reset, and the corresponding process in Figure 3 is re-executed to find the corresponding refrigeration level, avoiding overcooling and causing damage to the cells due to too low cell temperature.

[0113] Exemplarily, the low temperature threshold can be -5°C, 0°C, 5 degrees Celsius, etc.

[0114] Specifically, the fast cooling control strategy includes: determining the current refrigeration level of the energy storage system according to the liquid cooling hierarchical control strategy; calculating the temperature change rate according to the average cell temperature at the first target time, the average cell temperature at the second target time, and the preset interval time of the energy storage system, where the preset interval time is the time difference between the first target time and the second target time; judging whether the energy storage system needs fast cooling according to the temperature change rate and the preset temperature change rate threshold; if the energy storage system needs fast cooling, controlling the energy storage system to cool at the next lower refrigeration level of the current required refrigeration level; if the energy storage system does not need fast cooling, controlling the energy storage system to maintain the current refrigeration level.

[0115] Optionally, the liquid cooling control method of the energy storage system further includes: obtaining the current refrigeration level of the energy storage system;

[0116] judging whether the highest cell temperature in the energy storage system is greater than the cell temperature threshold corresponding to the next lower refrigeration level;

[0117] If the highest temperature of the battery cell is greater than the battery cell temperature threshold corresponding to the next-level refrigeration level, control the energy storage system to perform refrigeration using the next-level refrigeration level.

[0118] In this way, by judging the temperature change rate and the battery cell temperature threshold, when the battery cell is in a state of rapid temperature rise, the liquid cooling unit can be quickly controlled to enter the next refrigeration level, and the cooling of the battery cell can be quickly achieved.

[0119] Specifically, the temperature change rate is calculated by the following formula:

[0120] ;

[0121] where, is the average temperature at the first target time, is the average temperature at the second target time, t is the preset interval time, is the temperature change rate, is the first target time, is the second target time.

[0122] In this way, the temperature change rate of the battery cell during operation is intuitively shown through the temperature change rate. When the temperature rises too fast, the refrigeration level can be quickly controlled directly according to the temperature change rate to achieve rapid cooling of the battery cell.

[0123] Exemplarily, please refer to Figure 2 , Figure 2 which shows a schematic flow diagram of the rapid refrigeration control strategy of the energy storage system.

[0124] As Figure 2 shown, when the rapid refrigeration control strategy of the energy storage system includes:

[0125] Step S201, adopt the Nth-level refrigeration mode.

[0126] After step S201, execute step S202 to judge whether the temperature change rate is greater than a preset temperature change rate threshold.

[0127] Among them, the temperature change rate threshold can be 5°C / h - 7°C / h.

[0128] As an example, the temperature change rate threshold can be 5°C / h, 6°C / h, 7°C / h, etc.

[0129] If the temperature change rate is greater than the preset temperature change rate threshold, then execute step S203 to judge whether the liquid cooling unit of the energy storage system is in the maximum load state.

[0130] If the liquid cooling unit of the energy storage system is not in the maximum load state, then step S205 is executed, and the (N + 1)-th level refrigeration mode is adopted, where N is a positive integer.

[0131] In this way, when the battery cells are in the stage of rapid heat release, the liquid cooling unit can be directly controlled to enter the next refrigeration level quickly through the rate of change of the battery cell temperature, and the cooling of the battery cells can be achieved quickly.

[0132] If the rate of temperature change is less than or equal to a preset temperature change rate threshold, then step S201 is executed, and the N-th level refrigeration mode is adopted, where N is a positive integer.

[0133] Among them, the value range of N is 2 - 6.

[0134] As an example, the refrigeration mode of the energy storage system can be divided into 3 levels, 4 levels, 5 levels, 7 levels, etc.

[0135] If the liquid cooling unit of the energy storage system is in the maximum load state, then step S201 is executed, and the N-th level refrigeration mode is adopted.

[0136] In this way, when the refrigeration capacity of the condenser of the liquid cooling unit is not sufficient to meet the requirements of the refrigeration cycle, regardless of the result of the rate of change judgment, it will not enter the next level of refrigeration mode to protect the liquid cooling unit.

[0137] After step S201, step S204 is also executed to determine whether the maximum temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next level of refrigeration.

[0138] If the maximum temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next level of refrigeration, then step S203 is executed to determine whether the liquid cooling unit of the energy storage system is in the maximum load state.

[0139] If the liquid cooling unit of the energy storage system is not in the maximum load state, then step S205 is executed, and the (N + 1)-th level refrigeration mode is adopted.

[0140] If the liquid cooling unit of the energy storage system is in the maximum load state, then step S201 is executed, and the N-th level refrigeration mode is adopted.

[0141] If the maximum temperature of the battery cells is less than or equal to the battery cell temperature threshold corresponding to the next level of refrigeration, then step S201 is executed, and the N-th level refrigeration mode is adopted.

[0142] In this way, when the battery cells are in the stage of rapid heat release, the liquid cooling unit can be directly controlled to enter the next refrigeration level quickly through the battery cell temperature level, and the cooling of the battery cells can be achieved quickly.

[0143] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0144] Based on the same inventive concept, an embodiment of the present application further provides a liquid cooling control device for an energy storage system for implementing the liquid cooling control method of the energy storage system involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the liquid cooling control device for the energy storage system provided below can refer to the limitations on the liquid cooling control method for the energy storage system in the above text, and will not be repeated here.

[0145] Please refer to Figure 4 , in an exemplary embodiment, a liquid cooling control device for an energy storage system is provided, including: a heat release speed judgment module 20, a liquid cooling hierarchical control module 30, and a rapid cooling control module 40. The heat release speed judgment module 20 is configured to judge whether the energy storage system is in a stage of rapid heat release according to the working state of the energy storage system and the remaining power of the energy storage system; the liquid cooling hierarchical control module 30 is configured to control the energy storage system to execute a liquid cooling hierarchical control strategy if the energy storage system is not in a stage of rapid heat release; the rapid cooling control module 40 is configured to control the energy storage system to execute a rapid cooling control strategy if the energy storage system is in a stage of rapid heat release.

[0146] In some of these embodiments, the liquid cooling control device for the energy storage system further includes: a liquid cooling unit load determination module, configured to obtain the pressure data of the liquid cooling unit in the energy storage system; determine whether the liquid cooling unit in the energy storage system is in a maximum load state according to the pressure data of the liquid cooling unit in the energy storage system; if the liquid cooling unit in the energy storage system is in a maximum load state, determine the maximum cooling state of the liquid cooling unit as the current cooling state.

[0147] In some of these embodiments, the liquid cooling hierarchical control module is specifically configured to:

[0148] Judge whether the energy storage system needs to perform hierarchical refrigeration according to the highest temperature of the battery cells in the energy storage system and the pre-set multi-level battery cell temperature thresholds; if hierarchical refrigeration is not required, control the liquid cooling unit to adopt a self-circulation mode.

[0149] In some of these embodiments, the liquid cooling hierarchical control module is further configured to: if the energy storage system needs to perform hierarchical refrigeration, determine the current required refrigeration level of the energy storage system according to the highest temperature of the battery cells and a preset multi-level battery cell temperature threshold; determine whether the current ambient temperature is greater than a preset ambient temperature threshold; if the current ambient temperature is less than or equal to the preset ambient temperature threshold, control the energy storage system to perform refrigeration at the current required refrigeration level; if the current ambient temperature is greater than the preset ambient temperature threshold, control the energy storage system to perform refrigeration at the next lower refrigeration level; wherein, the refrigeration capacity of the next lower refrigeration level is greater than the refrigeration capacity of the current required refrigeration level.

[0150] In some of these embodiments, the liquid cooling hierarchical control module is further configured to: obtain the current refrigeration level of the energy storage system; determine whether the highest temperature of the battery cells in the energy storage system is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, and determine whether the current ambient temperature is greater than the preset ambient temperature threshold; if the highest temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, and the current ambient temperature is greater than the preset ambient temperature threshold, control the energy storage system to use the next lower refrigeration level for refrigeration.

[0151] In some of these embodiments, the liquid cooling hierarchical control module is further configured to: if the highest temperature of the battery cells is less than or equal to the battery cell temperature threshold corresponding to the next lower refrigeration level, or the current ambient temperature is less than or equal to the preset ambient temperature threshold, control the energy storage system to maintain the current refrigeration level for refrigeration.

[0152] In some of these embodiments, the heat release rate judgment module is specifically configured to: if the working state of the energy storage system is a discharging working state and the remaining power of the energy storage system is less than a preset first power, determine that the energy storage system is in a rapid heat release stage; if the working state of the energy storage system is a non-discharging working state, or the remaining power of the energy storage system is less than the preset first power, determine that the energy storage system is not in a rapid heat release stage.

[0153] In some of these embodiments, the rapid refrigeration control module is specifically configured to: determine the current refrigeration level of the energy storage system according to the liquid cooling hierarchical control strategy; calculate a temperature change rate according to the average temperature of the battery cells at a first target time, the average temperature of the battery cells at a second target time, and a preset interval time, where the preset interval time is the time difference between the first target time and the second target time; determine whether the energy storage system needs to perform rapid refrigeration according to the temperature change rate and a preset temperature change rate threshold; if the energy storage system needs to perform rapid refrigeration, control the energy storage system to perform refrigeration at the next lower refrigeration level; if the energy storage system does not need to perform rapid refrigeration, control the energy storage system to maintain the current refrigeration level.

[0154] In some of these embodiments, the rapid cooling control module is further configured to: obtain the current cooling level of the energy storage system; determine whether the highest temperature of the battery cells in the energy storage system is greater than the battery cell temperature threshold corresponding to the next cooling level; and if the highest temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next cooling level, control the energy storage system to perform cooling using the next cooling level.

[0155] In some of these embodiments, the rapid cooling control module is further configured to calculate the temperature change rate through the following formula:

[0156] ;

[0157] where, is the average temperature at the first target time, is the average temperature at the second target time, t is the preset interval time, is the temperature change rate, is the first target time, is the second target time.

[0158] Each module in the liquid cooling control device of the above energy storage system can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above respective modules.

[0159] In an exemplary embodiment, a computer device is provided, which may be a terminal. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. The computer program, when executed by the processor, implements a liquid cooling control method for an energy storage system. The display unit of the computer device is used to form a visually visible picture, which can 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. The input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball, or a touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse, etc.

[0160] Those skilled in the art can understand that Figure 5 the internal structure of the computer device shown in the figure is only a block diagram of a part 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 those shown in the figure, or combine certain components, or have different component arrangements.

[0161] In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the following steps are implemented:

[0162] According to the working state of the energy storage system and the remaining power of the energy storage system, determine whether the energy storage system is in the stage of rapid heat release;

[0163] If the energy storage system is not in the stage of rapid heat release, control the energy storage system to execute a liquid cooling hierarchical control strategy;

[0164] If the energy storage system is in the stage of rapid heat release, control the energy storage system to execute a rapid refrigeration control strategy.

[0165] 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:

[0166] According to the working state of the energy storage system and the remaining power of the energy storage system, determine whether the energy storage system is in a stage of rapid heat release;

[0167] If the energy storage system is not in a stage of rapid heat release, control the energy storage system to execute a liquid cooling hierarchical control strategy;

[0168] If the energy storage system is in a stage of rapid heat release, control the energy storage system to execute a rapid refrigeration control strategy.

[0169] In some embodiments, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0170] According to the working state of the energy storage system and the remaining power of the energy storage system, determine whether the energy storage system is in a stage of rapid heat release;

[0171] If the energy storage system is not in a stage of rapid heat release, control the energy storage system to execute a liquid cooling hierarchical control strategy;

[0172] If the energy storage system is in a stage of rapid heat release, control the energy storage system to execute a rapid refrigeration control strategy.

[0173] In some embodiments, an energy storage system is provided, including: a battery pack; a management subsystem; an energy storage inverter; a thermal management subsystem for executing the steps of the method in any one of the above embodiments.

[0174] In some embodiments, an electrical device is provided, including the liquid cooling control device of the energy storage system in any one of the above embodiments.

[0175] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing 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 methods. Among them, any reference to a memory, database, or other medium 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), magnetoresistive 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 be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0176] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this application.

[0177] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A liquid cooling control method for an energy storage system, characterized in that, Including: Judging whether the energy storage system is in the stage of rapid heat release according to the working state of the energy storage system and the remaining power of the energy storage system; If the energy storage system is not in the stage of rapid heat release, controlling the energy storage system to execute a liquid cooling hierarchical control strategy; If the energy storage system is in the stage of rapid heat release, controlling the energy storage system to execute a rapid refrigeration control strategy; Wherein, the rapid refrigeration control strategy includes: Calculating a temperature change rate according to the average temperature of the battery cells at a first target time of the energy storage system, the average temperature of the battery cells at a second target time, and a preset interval time, where the preset interval time is the time difference between the first target time and the second target time; Judging whether the energy storage system needs to perform rapid refrigeration according to the temperature change rate and a preset temperature change rate threshold.

2. The liquid cooling control method of the energy storage system according to claim 1, characterized in that Also including: Obtaining the pressure data of the liquid cooling unit in the energy storage system; Determining whether the liquid cooling unit is in the maximum load state according to the pressure data; If the liquid cooling unit is in the maximum load state, determining the maximum refrigeration state of the liquid cooling unit as the current refrigeration state.

3. The liquid cooling control method of the energy storage system according to claim 1, characterized in that The liquid cooling hierarchical control strategy includes: Judging whether the energy storage system needs to perform hierarchical refrigeration according to the highest temperature of the battery cells in the energy storage system and a preset multi-level battery cell temperature threshold; If hierarchical refrigeration is not required, controlling the liquid cooling unit to adopt a self-circulation mode.

4. The liquid cooling control method of the energy storage system according to claim 3, characterized in that, Also including: If the energy storage system needs to perform hierarchical refrigeration, determining the current required refrigeration level of the energy storage system according to the highest temperature of the battery cells and the preset multi-level battery cell temperature threshold; Judging whether the current ambient temperature of the environment where the energy storage system is located is greater than a preset ambient temperature threshold; If the current ambient temperature is less than or equal to the preset ambient temperature threshold, controlling the energy storage system to refrigerate at the current required refrigeration level; If the current ambient temperature is greater than the preset ambient temperature threshold, controlling the energy storage system to refrigerate at the next lower refrigeration level of the current required refrigeration level; Wherein, the refrigeration capacity of the next lower refrigeration level is greater than the refrigeration capacity of the current required refrigeration level.

5. The liquid cooling control method of the energy storage system according to claim 4, characterized in that, Also including: Obtaining the current refrigeration level of the energy storage system; Judging whether the highest temperature of the battery cells in the energy storage system is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, and judging whether the current ambient temperature is greater than the preset ambient temperature threshold; If the highest temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, and the current ambient temperature is greater than the preset ambient temperature threshold, controlling the energy storage system to refrigerate at the next lower refrigeration level.

6. The liquid cooling control method of the energy storage system according to claim 5, wherein Also including: If the highest temperature of the battery cells is less than or equal to the battery cell temperature threshold corresponding to the next lower refrigeration level, or the current ambient temperature is less than or equal to the preset ambient temperature threshold, controlling the energy storage system to refrigerate at the current refrigeration level.

7. The liquid cooling control method of the energy storage system according to claim 1, wherein Judging whether the energy storage system is in the stage of rapid heat release according to the working state of the energy storage system and the remaining power of the energy storage system, including: If the operating state of the energy storage system is the discharging operating state and the remaining power of the energy storage system is less than a preset first power, it is determined that the energy storage system is in the stage of rapid heat release; If the operating state of the energy storage system is the non-discharging operating state, or the remaining power of the energy storage system is less than the preset first power, it is determined that the energy storage system is not in the stage of rapid heat release.

8. The liquid cooling control method of the energy storage system according to claim 1, characterized in that, The rapid refrigeration control strategy further includes: If the energy storage system needs to perform rapid refrigeration, control the energy storage system to refrigerate at the next lower refrigeration level of the currently required refrigeration level; If the energy storage system does not need to perform rapid refrigeration, control the energy storage system to maintain the current refrigeration level.

9. The liquid cooling control method of the energy storage system according to claim 8, wherein It further includes: Obtain the current refrigeration level of the energy storage system; Judge whether the highest temperature of the battery cells in the energy storage system is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level; If the highest temperature of the battery cells is greater than the battery cell temperature threshold corresponding to the next lower refrigeration level, control the energy storage system to refrigerate at the next lower refrigeration level.

10. The liquid cooling control method of the energy storage system according to claim 9, characterized in that, Calculate the temperature change rate through the following formula: ； wherein, is the average temperature at the first target time, is the average temperature at the second target time, t is the preset interval time, is the temperature change rate, is the first target time, is the second target time.

11. A liquid cooling control device for an energy storage system, characterized in that, It includes: A heat release speed judgment module, configured to judge whether the energy storage system is in the stage of rapid heat release according to the operating state of the energy storage system and the remaining power of the energy storage system; A liquid cooling hierarchical control module, configured to control the energy storage system to execute the liquid cooling hierarchical control strategy if the energy storage system is not in the stage of rapid heat release; A rapid refrigeration control module, configured to control the energy storage system to execute the rapid refrigeration control strategy if the energy storage system is in the stage of rapid heat release.

12. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the liquid cooling control method of the energy storage system described in any one of claims 1 to 10 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the liquid cooling control method of the energy storage system described in any one of claims 1 to 10 are implemented.

14. A energy storage system, characterized in that, It includes: A battery pack; A management subsystem; An energy storage converter; A thermal management subsystem, configured to execute the steps of the liquid cooling control method of the energy storage system described in any one of claims 1 to 10.

15. An electrical device, characterized in that, It includes the liquid cooling control device of the energy storage system as described in claim 11.

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