Temperature control method of energy storage system, electronic equipment and storage medium

Abstract

The invention provides a temperature control method of an energy storage system, electronic equipment and a storage medium. The method comprises the following steps: acquiring a working state of the energy storage system; monitoring temperature data of a battery cell in the energy storage system; and determining a temperature control strategy of the liquid cooling system in the energy storage system according to the temperature data and the working state. Different thermal management conditions of the energy storage system in different working states are considered, and the temperature control strategy is carried out in combination with the working states and the temperature data of the battery cell, so that the determined temperature control strategy can meet the corresponding working state, and the working efficiency is improved. The method ensures that the cell temperature after the execution of the temperature strategy is at the optimal efficiency position in the charging and discharging process, enables the energy storage system to be in the optimal state, achieves the precise heat management of the energy storage system, and improves the energy efficiency and the charging and discharging performance of the energy storage system.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a temperature control method, electronic device, and storage medium for an energy storage system. Background Technology

[0002] Thermal management systems address the heat dissipation challenges of high-power systems through precise temperature control, reducing the risk of thermal runaway. They are a core guarantee for the safe, efficient, and long-life operation of energy storage systems (such as lithium battery systems). Liquid cooling systems, due to their higher heat dissipation efficiency and better temperature uniformity, are commonly used as the thermal management system for energy storage systems. However, the power consumption of liquid cooling systems accounts for a relatively high proportion of the energy storage system's self-consumption rate. Therefore, optimizing the temperature control strategy of liquid cooling systems is necessary and can significantly improve the performance of energy storage systems.

[0003] In related technologies, the temperature control strategy is usually based on a uniform control method, that is, the temperature control strategy is determined according to the temperature of the cells in the energy storage system and a uniform temperature threshold. It is impossible to make precise adjustments according to the dynamic needs during the charging and discharging process of the battery. This makes it difficult for the cell temperature to be at the optimal position during the charging and discharging process, resulting in the energy storage system failing to perform at its best, reducing the energy efficiency and charging and discharging performance of the energy storage system. Summary of the Invention

[0004] The embodiments of the present invention provide a temperature control method, electronic device and storage medium for an energy storage system, which aims to perform precise thermal management of the energy storage system and improve the energy efficiency and charge / discharge performance of the energy storage system.

[0005] In a first aspect, embodiments of the present invention provide a temperature control method for an energy storage system, the method comprising:

[0006] Obtain the operating status of the energy storage system;

[0007] Monitor the temperature data of the cells in the energy storage system;

[0008] Based on the temperature data and the operating status, a temperature control strategy for the liquid cooling system in the energy storage system is determined.

[0009] Secondly, embodiments of the present invention provide a temperature control device for an energy storage system, the temperature control device for the energy storage system comprising:

[0010] The acquisition module is used to acquire the operating status of the energy storage system.

[0011] The monitoring module is used to monitor the temperature data of the cells in the energy storage system;

[0012] The determination module is used to determine the temperature control strategy of the liquid cooling system in the energy storage system based on the temperature data and the operating status.

[0013] Thirdly, embodiments of the present invention provide an electronic device, the electronic device comprising:

[0014] One or more processors;

[0015] Memory; and

[0016] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the steps in the temperature control method for the energy storage system according to any one of the first aspects.

[0017] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to perform the steps in the temperature control method of the energy storage system according to any one of the first aspects.

[0018] Fifthly, this application also provides a computer program product, including a computer program / instructions, which, when executed by a processor, are used to perform the steps in the temperature control method of the energy storage system described in any of the first aspects above.

[0019] The beneficial effects of the embodiments of the present invention are as follows:

[0020] In embodiments of the present invention, the operating status of the energy storage system is acquired; the temperature data of the battery cells in the energy storage system is monitored; and a temperature control strategy for the liquid cooling system in the energy storage system is determined based on the temperature data and the operating status. Since the thermal management conditions of the energy storage system differ under different operating states, the temperature control strategy, which combines the operating status and the battery cell temperature data, is tailored to the specific operating state. This ensures that the battery cell temperature is at its optimal position during charging and discharging after the implementation of the temperature strategy, allowing the energy storage system to perform at its best. This achieves precise thermal management of the energy storage system, improving its energy efficiency and charging / discharging performance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1This is a schematic flowchart of an embodiment of the temperature control method for an energy storage system provided by the present invention;

[0023] Figure 2 This is a flowchart illustrating the process of determining the working status provided in the embodiments of this application;

[0024] Figure 3 This is a schematic flowchart illustrating the temperature control process of an energy storage system provided in the embodiments of this application;

[0025] Figure 4 This is a schematic diagram of an embodiment of the temperature control device for the energy storage system provided in this application.

[0026] Figure 5 This is a schematic diagram of an embodiment of the electronic device provided in this application. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0028] Currently, the thermal management control in energy storage systems, specifically the temperature control strategy of liquid cooling systems, is relatively crude. For example, it fails to differentiate between the different temperature control requirements during charging / discharging and in a static state, applying a uniform standard to all situations. This leads to frequent activation of the liquid cooling system in the static state, resulting in increased power consumption. Furthermore, the predominantly passive temperature control strategy means that the cell temperature is not at its optimal efficiency position during charging / discharging, causing the system to fail to perform at its best and resulting in decreased energy efficiency.

[0029] Therefore, this application proposes a temperature control method, electronic device, and computer-storable medium for an energy storage system to perform precise thermal management of the energy storage system, thereby improving the energy efficiency and charge / discharge performance of the energy storage system.

[0030] like Figure 1The diagram shown is a flowchart illustrating an embodiment of the temperature control method for an energy storage system in this application. The executing entity in this embodiment is an electrical device or a control module within that device. This control module can be a Battery Management System (BMS), a Vehicle Control Unit (VCU), etc. This application embodiment uses a BMS as an example for detailed explanation. The temperature control method for the energy storage system includes:

[0031] 101. Obtain the operating status of the energy storage system.

[0032] The operating status refers to the specific operating mode or conditions under which the energy storage system operates, reflecting its operational status and functional performance. The thermal management conditions of an energy storage system differ under different operating statuses, and acquiring and determining the operating status is crucial for optimizing system operation, improving efficiency, ensuring safety, and achieving refined management.

[0033] Specifically, the operating status of the energy storage system can be determined based on the operating scenario and the operating data under the operating scenario. It can be understood that in this embodiment, by obtaining the operating status of the energy storage system, the thermal management of the energy storage system can be precisely controlled based on the operating status.

[0034] In one embodiment, such as Figure 2 As shown, step 101 includes:

[0035] 101A, in the first scenario where the energy storage system is in a state where the charging and discharging time can be predicted in advance, the working state is determined to be either a static state or a charging and discharging state based on the charging and discharging operation schedule corresponding to the first scenario.

[0036] 101B, In the second scenario where the energy storage system is in a state where the charging and discharging time is unpredictable, the working state is determined to be either a static state or a charging and discharging state based on the real-time charging and discharging situation corresponding to the second scenario.

[0037] The first scenario involves situations where the discharge of the energy storage system can be predicted in advance, such as peak-valley arbitrage, autonomous allocation of new energy distribution and storage, and reserve capacity. The second scenario involves situations where the charging and discharging time cannot be predicted, such as emergency grid control and fault handling, frequency regulation and dynamic support, and smoothing out fluctuations in renewable energy output, where the accurate charging and discharging time cannot be determined.

[0038] Specifically, for the first scenario, the charging and discharging schedule corresponding to the first scenario can be obtained in advance through the Energy Management System (EMS). Based on the charging and discharging schedule, it can determine whether charging and discharging will occur within a preset time period (e.g., the next 5 minutes) to determine the working status. For example, if charging and discharging will occur within the preset time period, it is determined to be in a charging and discharging state; if charging and discharging will not occur within the preset time period, it is determined to be in a stationary state. For the second scenario, the working status is determined based on the real-time charging and discharging situation corresponding to the second scenario. For example, if charging and discharging are currently in progress, it is determined to be in a charging and discharging state; if charging and discharging are not currently in progress, it is determined to be in a stationary state.

[0039] 102. Monitor the temperature data of the cells in the energy storage system.

[0040] The temperature data of the battery cells can be the highest temperature, the lowest temperature of the battery cells, or the average temperature of multiple battery cells. This temperature data is used to monitor and analyze the operating temperature of the energy storage system in real time, so as to take corresponding temperature control measures to ensure that the battery cells operate within a safe temperature range.

[0041] Specifically, temperature sensors installed in the energy storage system can monitor the cell temperature data in real time. This data is transmitted to the BMS (Battery Management System) for analysis and control of the cell's operating temperature. Understandably, by monitoring the cell temperature data in this embodiment, the energy storage system can achieve more precise temperature control management, improving system safety and reliability.

[0042] 103. Based on the temperature data and the operating status, determine the temperature control strategy of the liquid cooling system in the energy storage system.

[0043] Specifically, by combining temperature data and the temperature thresholds corresponding to the operating state, a temperature control strategy for the liquid cooling system in the energy storage system can be determined, and the liquid cooling system can be controlled to execute the determined temperature control strategy, thereby achieving precise thermal management of the energy storage system. Since the temperature control strategy for the liquid cooling system is determined based on the operating state and temperature data of the energy storage system, it can ensure that the energy storage system operates efficiently and safely under different operating conditions, while reducing energy consumption and extending battery life.

[0044] Understandably, considering the different thermal management conditions of the energy storage system under different operating states, a temperature control strategy is developed by combining the operating state and the temperature data of the battery cells. This ensures that the determined temperature control strategy can meet the requirements of the corresponding operating state, and that the battery cell temperature after implementing the temperature strategy is at the optimal position during charging and discharging. This allows the energy storage system to perform at its best, achieving precise thermal management of the energy storage system and improving its energy efficiency and charging and discharging performance.

[0045] In one embodiment, determining the temperature control strategy of the liquid cooling system in the energy storage system based on the temperature data and the operating state includes: determining the temperature control strategy based on the temperature data and a first temperature threshold under the charging / discharging state when the operating state is the charging / discharging state; and determining the temperature control strategy based on the temperature data and a second temperature threshold under the quiescent state when the operating state is the idling state.

[0046] The first temperature threshold is the relevant temperature threshold under charging and discharging conditions, and the second temperature threshold is the relevant temperature threshold under quiescent conditions. The inventors discovered that when the energy storage system is quiescent, even in summer when the external environment causes the cell temperature to reach 30°C, it remains within its storage temperature range and cooling is not required. However, during charging and discharging, when the cell temperature reaches 30°C, cooling is necessary to prevent overheating, considering the heat generated during the charging and discharging process. If cooling is initiated under quiescent conditions without considering the operating state, self-consumption increases, reducing the energy efficiency of the energy storage system. Therefore, by differentiating operating states and setting different temperature thresholds, the operation of the liquid cooling system can be effectively optimized, improving the overall performance and economy of the energy storage system.

[0047] Specifically, when the operating state is charging / discharging, a temperature control strategy is determined based on temperature data and a first temperature threshold under charging / discharging conditions; when the operating state is stagnant, a temperature control strategy is determined based on temperature data and a second temperature threshold under stagnant conditions. Understandably, in this embodiment, the temperature control strategy is determined based on the temperature thresholds under different operating states and the temperature data of the energy storage system, distinguishing the thermal management conditions of different operating states. This effectively optimizes the operation of the liquid cooling system and improves the overall performance and economy of the energy storage system.

[0048] In one embodiment, the temperature data includes the average temperature of the battery cell, and the first temperature threshold includes a first low temperature threshold and a first high temperature threshold; determining the temperature control strategy based on the temperature data and the first temperature threshold under the charging and discharging state includes: when the average temperature is less than or equal to the first low temperature threshold, determining that the temperature control strategy is to control the liquid cooling system to start the heating mode; every first preset time interval, determining whether the current average temperature is less than or equal to the first low temperature threshold, until the current average temperature is greater than or equal to the first high temperature threshold, determining that the temperature control strategy is to control the liquid cooling system to exit the heating mode.

[0049] The first low temperature threshold refers to the critical value of the average temperature of the battery cell that the liquid cooling system needs to activate the heating mode for during charging and discharging. That is, when the average temperature of the battery cell is lower than or equal to this temperature during charging and discharging, the liquid cooling system needs to activate the heating mode to prevent the battery temperature from getting too low. For example, the first low temperature threshold can be 25°C.

[0050] The first high temperature threshold refers to the critical value of the average temperature of the battery cell that the liquid cooling system needs to exit the heating mode under charging and discharging conditions. That is, when the average temperature of the battery cell reaches or exceeds this temperature under charging and discharging conditions, the liquid cooling system needs to exit the heating mode to prevent the battery temperature from becoming too high. For example, the first high temperature threshold can be 28°C.

[0051] The inventors discovered that when an energy storage system is in a charging / discharging state, it indicates that charging / discharging will occur at that time or within a preset time period. The charging / discharging capacity and efficiency of the energy storage system are both temperature-dependent. Therefore, appropriately increasing the temperature has a significant effect on improving the electrical performance of the energy storage system. Thus, the first low-temperature threshold and the first high-temperature threshold can be increased, thereby ensuring that the corresponding temperature control strategy can maintain the temperature at a controllable high-temperature state.

[0052] The first preset time refers to the period during which the temperature control strategy is adjusted when the heating mode is activated or deactivated. For example, the first preset time can be 15 seconds.

[0053] Starting the heating mode can be done by turning on the heater of the liquid cooling system, such as a PTC; exiting the heating mode can be done by turning off the heater of the liquid cooling system.

[0054] Specifically, when the energy storage system is in a charging / discharging state, if the average temperature is less than or equal to a first low-temperature threshold, it indicates that the battery temperature is too low. Therefore, the temperature control strategy is determined to be to control the liquid cooling system to start the heating mode, and at first preset time intervals, continue to determine whether the current average temperature is less than or equal to the first low-temperature threshold, until the current average temperature is greater than or equal to the first high-temperature threshold, i.e., when the battery temperature is too high, the temperature control strategy is determined to be to control the liquid cooling system to exit the heating mode. It can be understood that in this embodiment, by setting the first low-temperature threshold and the first high-temperature threshold, the liquid cooling system can be precisely controlled according to the actual temperature requirements of the battery, and the energy storage system can maintain a controllable high-temperature state, improving the energy efficiency and charging / discharging performance of the energy storage system.

[0055] In one embodiment, the first temperature threshold includes a second high temperature threshold that is greater than the first high temperature threshold; determining the temperature control strategy based on the temperature data and the first temperature threshold under the charging / discharging state includes: determining that the temperature control strategy is to control the liquid cooling system to enter a self-circulation mode when the average temperature is greater than the first low temperature threshold and less than or equal to the second high temperature threshold; and continuing to execute the step of determining that the temperature control strategy is to control the liquid cooling system to enter a self-circulation mode when the average temperature is greater than the first low temperature threshold and less than or equal to the second high temperature threshold every second preset time interval.

[0056] The second high temperature threshold refers to the critical value of the average temperature of the battery cell that the liquid cooling system needs to enter the self-circulation mode under charging and discharging conditions, and it is greater than the first high temperature threshold. That is, under charging and discharging conditions, when the average temperature of the battery cell is greater than the first high temperature threshold but does not exceed this higher temperature, the liquid cooling system needs to enter the self-circulation mode. For example, the second high temperature threshold can be 29°C.

[0057] Self-circulation mode refers to a liquid cooling system where the compressor does not start but the water pump continues to run to perform temperature equalization, without interfering with the temperature level.

[0058] The second preset time refers to the period during which the temperature control strategy is adjusted when the self-circulation mode is activated. For example, the second preset time can be 15 seconds.

[0059] Specifically, when the energy storage system is in a charging / discharging state, if the average temperature is greater than a first low-temperature threshold and less than or equal to a second high-temperature threshold, it indicates that the battery temperature is suitable. Therefore, the temperature control strategy is determined to control the liquid cooling system to enter a self-circulation mode, and at every second preset time interval, continue to enter the self-circulation mode when the battery temperature is suitable. Understandably, in this embodiment, by setting a second high-temperature threshold, a buffer zone is provided to avoid the liquid cooling system frequently switching between cooling and heating modes when approaching the first high-temperature threshold, thereby reducing energy consumption and improving system stability. This allows the energy storage system to maintain a controllable high-temperature state, improving the energy efficiency and charging / discharging performance of the energy storage system.

[0060] In one embodiment, the temperature data includes the average temperature and maximum temperature of the battery cell, and the first temperature threshold includes a second high-temperature threshold, a third high-temperature threshold, a fourth high-temperature threshold greater than the second high-temperature threshold and less than the third high-temperature threshold, and a fifth high-temperature threshold less than the second high-temperature threshold; the temperature control strategy is determined based on the temperature data and the first temperature threshold under the charging and discharging state; the determination of the temperature control strategy based on the temperature data and the first temperature threshold under the charging and discharging state includes: when the average temperature is greater than the second high-temperature threshold and the maximum temperature is less than the third high-temperature threshold, determining the temperature control strategy as controlling the liquid cooling system to start the first-level cooling mode; when the maximum temperature is less than the third high-temperature threshold, determining the temperature control strategy as controlling the liquid cooling system to start the first-level cooling mode; when the average temperature is greater than the second high-temperature threshold and the maximum temperature is less than the third high-temperature threshold, determining the temperature control strategy as controlling the liquid cooling system to start the first-level cooling mode; when the average ... greater than the second high-temperature threshold and the maximum temperature is less than the third high-temperature threshold, determining the temperature control strategy as controlling the liquid cooling system to start the first-level cooling mode; when the average temperature is greater than the second high-temperature threshold and the maximum temperature is less than the third high-temperature threshold, determining the temperature control strategy as controlling the liquid cooling system to start the first- When the average temperature is less than the fifth high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the first-level cooling mode; when the average temperature is greater than the second high temperature threshold and the highest temperature is greater than or equal to the third high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to start the second-level cooling mode; when the highest temperature is less than or equal to the fourth high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the second-level cooling mode. The first cooling power corresponding to the first-level cooling mode and the second cooling power corresponding to the second-level cooling mode are calculated and determined according to the current heat generation power of the energy storage system using a first gain and a second gain, respectively, where the first gain is less than the second gain.

[0061] The third high-temperature threshold refers to the temperature at which the liquid cooling system needs to activate a secondary cooling mode when the cell's maximum temperature reaches or exceeds this temperature during charging and discharging. It is a higher temperature value than the second high-temperature threshold, used to distinguish different temperature control stages. For example, the third high-temperature threshold could be the system's highest temperature control value (e.g., 35°C) - 2°C, i.e., 33°C.

[0062] The fourth high-temperature threshold refers to the temperature at which the liquid cooling system needs to exit the secondary cooling mode when the maximum temperature of the battery cell is lower than this temperature during charging and discharging. It is a temperature value between the second and third high-temperature thresholds, used to further refine temperature control. For example, the fourth high-temperature threshold can be the highest temperature control value of the energy storage system (e.g., 35°C) - 5°C, i.e., 30°C.

[0063] The fifth high-temperature threshold refers to the temperature at which the liquid cooling system needs to exit the first-level cooling mode when the average temperature of the battery cell is lower than this temperature during charging and discharging. It is a temperature value lower than the second high-temperature threshold, used to further refine temperature control. For example, the fifth high-temperature threshold could be 27°C.

[0064] The first gain and the second gain refer to the gain adjustments made to the energy storage system based on its current heat production capacity when calculating the cooling power of the liquid cooling system. The first gain is used to calculate the cooling power in the first-stage cooling mode, and the second gain is used to calculate the cooling power in the second-stage cooling mode, with the first gain being less than the second gain. For example, the first gain could be 1.1, and the second gain could be 1.3.

[0065] Specifically, when the energy storage system is in a charging and discharging state, if the average temperature is greater than the second high temperature threshold and the highest temperature is less than the third high temperature threshold, it indicates that the battery temperature is high, and the temperature control strategy is to control the liquid cooling system to start the first-level cooling mode; if the highest temperature is less than the third high temperature threshold, or the average temperature is less than the fifth high temperature threshold, it indicates that the battery temperature is not high, and the temperature control strategy is to control the liquid cooling system to exit the first-level cooling mode.

[0066] When the average temperature is greater than the second high temperature threshold and the highest temperature is greater than or equal to the third high temperature threshold, it indicates that the battery temperature is too high, and the temperature control strategy is to control the liquid cooling system to start the secondary cooling mode; when the highest temperature is less than or equal to the fourth high temperature threshold, it indicates that the battery temperature is not high, and the temperature control strategy is to control the liquid cooling system to exit the secondary cooling mode.

[0067] Understandably, in this embodiment, by using a control strategy based on multi-level temperature thresholds and gains, the energy storage system can better adapt to different operating conditions, thereby improving the overall performance and economy of the energy storage system.

[0068] It should be noted that neither the first nor the second cooling power can exceed the rated power of the liquid cooling system to ensure the safety of the liquid cooling system.

[0069] In one embodiment, the method further includes: performing a heat generation simulation test on the energy storage system to obtain the correspondence between the test heat generation power at different test charge and discharge rates under different test states of charge; and determining the current heat generation power of the energy storage system at the current charge and discharge rate under the current state of charge based on the correspondence.

[0070] Specifically, based on the simulation test of the energy storage system, the heat generation power generated by the system at different rates of charge and discharge under different SOCs is obtained. This ensures that the cooling power of the liquid cooling system is kept at a specified ratio. In this way, the cooling power of the energy storage system is greater than its heating power, which can ensure that the temperature of the energy storage system will not rise further, avoid thermal runaway, and ensure safety.

[0071] In one embodiment, the temperature data includes the highest and lowest temperatures of the battery cell, and the second temperature threshold includes a second low-temperature threshold, a third low-temperature threshold greater than the second low-temperature threshold, a sixth high-temperature threshold, and a seventh high-temperature threshold less than the sixth high-temperature threshold. Based on the temperature data and the second temperature threshold in the static state, the temperature control strategy is determined, including: when the lowest temperature is less than or equal to the second low-temperature threshold and the highest temperature is less than the sixth high-temperature threshold, determining the temperature control strategy to control the liquid cooling system to start the heating mode; every third preset time interval, determining whether the current lowest temperature is greater than or equal to the third low-temperature threshold, until the current lowest temperature is greater than or equal to the third low-temperature threshold, determining the temperature control strategy to control the liquid cooling system to exit the heating mode; when the highest temperature is greater than or equal to the sixth high-temperature threshold, determining the temperature control strategy to control the liquid cooling system to start a three-level cooling mode; every fourth preset time interval, determining whether the current highest temperature is less than or equal to the seventh high-temperature threshold, until the current highest temperature is less than or equal to the seventh high-temperature threshold, determining the temperature control strategy to control the liquid cooling system to enter or exit the three-level cooling mode.

[0072] The inventors discovered that when the energy storage system is in a static state, without considering the influence of temperature control strategies, the cell temperature changes with the external ambient temperature. In a short period of time, it does not generate heat on its own. As long as the temperature is within the reasonable storage temperature range of the cell, no additional cooling or heating is required. The liquid cooling unit can be kept in a self-circulating state to reduce the system temperature difference, thereby further achieving energy-saving optimization and improving the energy efficiency of the energy storage system.

[0073] In one embodiment, the three-stage cooling power corresponding to the three-stage cooling mode is a preset cooling power. That is, the three-stage cooling power is a fixed value, so that it does not need to be frequently adjusted, ensuring that the battery temperature can be reduced quickly and effectively under high temperature conditions.

[0074] The second low-temperature threshold refers to the temperature at which the liquid cooling system needs to activate heating mode to prevent the battery temperature from becoming too low when the cell's lowest temperature is below or equal to this value under static conditions. For example, the second low-temperature threshold could be 15°C.

[0075] The third low-temperature threshold refers to the temperature at which the liquid cooling system needs to exit heating mode when the lowest temperature of the battery cell reaches or exceeds this temperature under static conditions. For example, the third low-temperature threshold could be 23°C.

[0076] The sixth high-temperature threshold refers to the temperature at which the liquid cooling system needs to activate a three-stage cooling mode when the cell's highest temperature reaches or exceeds this value under static conditions. It is a relatively high temperature value used to activate a stronger cooling mode in high-temperature situations. For example, the sixth high-temperature threshold could be 33°C.

[0077] The seventh high-temperature threshold refers to the temperature at which the liquid cooling system needs to exit the three-stage cooling mode when the highest temperature of the battery cell is below or equal to this temperature under static conditions. It is a lower temperature value than the sixth high-temperature threshold and is used to stop cooling after the temperature drops. For example, the seventh high-temperature threshold could be 26°C.

[0078] Specifically, when the energy storage system is in a static state, if the lowest temperature is less than or equal to the second low-temperature threshold and the highest temperature is less than the sixth high-temperature threshold, it indicates that the battery temperature is low and does not meet the temperature conditions for activating the three-level cooling mode. The temperature control strategy is then determined to activate the heating mode of the liquid cooling system. Every third preset time interval, it is determined whether the current lowest temperature is greater than or equal to the third low-temperature threshold. Once the current lowest temperature is greater than or equal to the third low-temperature threshold, the temperature control strategy is determined to deactivate the heating mode of the liquid cooling system. Similarly, if the highest temperature is greater than or equal to the sixth high-temperature threshold, the temperature control strategy is determined to activate the three-level cooling mode of the liquid cooling system. Every fourth preset time interval, it is determined whether the current highest temperature is less than or equal to the seventh high-temperature threshold. Once the current highest temperature is less than or equal to the seventh high-temperature threshold, the temperature control strategy is determined to deactivate the three-level cooling mode of the liquid cooling system. By setting multiple temperature thresholds, the liquid cooling system can employ different levels of cooling modes when the battery temperature is high but still within a safe range, reducing unnecessary energy consumption.

[0079] like Figure 3 The diagram shown illustrates the process of temperature control for an energy storage system, used to activate corresponding temperature control strategies under different temperature conditions. The flowchart is divided into two main parts: the system self-circulation state (i.e., the idle state) and the system call state (i.e., the charging and discharging state).

[0080] Check the lowest temperature: If the lowest temperature is ≤15℃, start the system in Level 1 heating mode. If the lowest temperature is >15℃, proceed to the next step.

[0081] Detect the highest temperature: If the highest temperature is ≥33℃, start the system's first-stage cooling (outlet water temperature 20℃). If the highest temperature is <33℃, proceed to the next step.

[0082] Further check the minimum temperature: If the minimum temperature is ≥23℃, return to the starting point of the temperature control strategy. If the minimum temperature is <23℃, delay for 3 minutes and continue to judge.

[0083] The system calls a status check and checks the average temperature: If the average temperature is ≤29℃, it returns to the starting point of the temperature control strategy. If the average temperature is >29℃, it proceeds to the next step.

[0084] Detect the highest temperature: If the highest temperature is ≥33℃, then start the system's secondary cooling.

[0085] If the highest temperature is less than 33℃, proceed to the next step.

[0086] Further check the average temperature: If the average temperature is ≤25℃, activate the system's first-level heating mode. If the average temperature is >25℃, delay for 1.5 seconds before continuing the assessment.

[0087] Check the average temperature again: If the average temperature is ≥28℃, return to the starting point of the temperature control strategy. If the average temperature is <28℃, proceed to the next step.

[0088] Detect the highest temperature: If the highest temperature is ≤30℃, return to the starting point of the temperature control strategy. If the highest temperature is >30℃, delay for 15 seconds and continue the judgment.

[0089] Check the average temperature again: If the average temperature is ≥27℃, activate the system's secondary cooling mode. If the average temperature is <27℃, proceed to the next step.

[0090] Finally, check the highest temperature: if the highest temperature > 33℃, return to the starting point of the temperature control strategy. If the highest temperature ≤ 33℃, delay for 15 seconds and continue the judgment.

[0091] In the self-circulation mode, the focus is on the minimum and maximum temperatures to determine whether to activate heating or cooling.

[0092] Call status: Based on the average temperature and the highest temperature, decide whether to start the first stage of heating, the second stage of cooling, or the first stage of cooling, and make a delay judgment in different temperature ranges to optimize the temperature control strategy.

[0093] By using multiple temperature thresholds and time delays, precise control of the liquid cooling temperature of the energy storage system is achieved, ensuring the safe and efficient operation of the battery under different operating conditions.

[0094] The temperature control method for the aforementioned energy storage system acquires the operating status of the energy storage system; monitors the temperature data of the battery cells in the energy storage system; and determines the temperature control strategy for the liquid cooling system in the energy storage system based on the temperature data and the operating status. Since the thermal management conditions of the energy storage system differ under different operating states, the temperature control strategy, which combines the operating status and the battery cell temperature data, is adapted to the corresponding operating states. This ensures that the battery cell temperature is at its optimal position during charging and discharging after implementing the temperature strategy, allowing the energy storage system to perform at its best. This achieves precise thermal management of the energy storage system, improving its energy efficiency and charging / discharging performance.

[0095] like Figure 4 As shown in the figure, this application embodiment also provides a temperature control device 200 for an energy storage system, the temperature control device 200 for the energy storage system comprising:

[0096] The acquisition module 201 is used to acquire the operating status of the energy storage system;

[0097] Monitoring module 202 is used to monitor the temperature data of the cells in the energy storage system;

[0098] The determination module 203 is used to determine the temperature control strategy of the liquid cooling system in the energy storage system based on the temperature data and the operating status.

[0099] In one embodiment, the acquisition module 201 is specifically used for:

[0100] In the first scenario where the energy storage system is in a state where the charging and discharging time can be predicted in advance, the working state is determined to be either a static state or a charging and discharging state based on the charging and discharging operation schedule corresponding to the first scenario.

[0101] In the second scenario where the energy storage system is in a state where the charging and discharging time is unpredictable, the working state is determined to be either a static state or a charging and discharging state based on the real-time charging and discharging situation corresponding to the second scenario.

[0102] In one embodiment, the determining module 203 is specifically used for:

[0103] When the working state is the charging and discharging state, the temperature control strategy is determined based on the temperature data and the first temperature threshold under the charging and discharging state;

[0104] When the working state is the stationary state, the temperature control strategy is determined based on the temperature data and the second temperature threshold in the stationary state.

[0105] In one embodiment, the determining module 203 is further configured to:

[0106] When the average temperature is less than or equal to the first low temperature threshold, the temperature control strategy is determined to control the liquid cooling system to start the heating mode.

[0107] At each first preset time interval, it is determined whether the current average temperature is less than or equal to the first low temperature threshold, until the current average temperature is greater than or equal to the first high temperature threshold, at which point the temperature control strategy is determined to control the liquid cooling system to exit the heating mode.

[0108] In one embodiment, the determining module 203 is further configured to:

[0109] When the average temperature is greater than the first low temperature threshold and less than or equal to the second high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to enter the self-circulation mode.

[0110] At every second preset time interval, the step of determining that the temperature control strategy is to control the liquid cooling system to enter the self-circulation mode is continued when the average temperature is greater than the first low temperature threshold and less than or equal to the second high temperature threshold.

[0111] In one embodiment, the temperature control device 200 of the energy storage system further includes:

[0112] The testing module is used to perform heat generation simulation tests on the energy storage system and obtain the corresponding relationship between the test heat generation power under different test charge and discharge rates under different test charge states.

[0113] The first determining module is used to determine the current heat generation power of the energy storage system at the current charge / discharge rate under the current state of charge, based on the correspondence.

[0114] In one embodiment, the determining module 203 is further configured to:

[0115] When the average temperature is greater than the second high temperature threshold and the highest temperature is less than the third high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the first-level cooling mode.

[0116] When the highest temperature is less than the third high temperature threshold, or the average temperature is less than the fifth high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the first-level cooling mode.

[0117] When the average temperature is greater than the second high temperature threshold and the highest temperature is greater than or equal to the third high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the secondary cooling mode.

[0118] When the highest temperature is less than or equal to the fourth high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the secondary cooling mode. The first cooling power corresponding to the primary cooling mode and the second cooling power corresponding to the secondary cooling mode are calculated and determined according to the current heat generation power of the energy storage system by performing a first gain and a second gain, respectively. The first gain is less than the second gain.

[0119] In one embodiment, the determining module 203 is further configured to:

[0120] When the lowest temperature is less than or equal to the second low temperature threshold, and the highest temperature is less than the sixth high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the heating mode.

[0121] Every third preset time interval, it is determined whether the current minimum temperature is greater than or equal to the third low temperature threshold. When the current minimum temperature is greater than or equal to the third low temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the heating mode.

[0122] If the highest temperature is greater than or equal to the sixth high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the three-level cooling mode.

[0123] Every fourth preset time interval, it is determined whether the current highest temperature is less than or equal to the seventh high temperature threshold. When the current highest temperature is less than or equal to the seventh high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to enter or exit the third-level cooling mode.

[0124] This application also provides an electronic device that integrates a temperature control device for any of the energy storage systems provided in this application. The electronic device includes:

[0125] One or more processors;

[0126] Memory; and

[0127] One or more applications, wherein the one or more applications are stored in the memory and configured by the processor to execute the temperature control method of the energy storage system as described in any of the embodiments of the above-described temperature control method for the energy storage system.

[0128] This application also provides an electronic device that integrates a temperature control device for any of the energy storage systems provided in this application. For example... Figure 5 As shown, it illustrates a structural schematic diagram of the electronic device involved in the embodiments of this application, specifically:

[0129] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will understand that... Figure 5 The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0130] in:

[0131] The processor 301 is the control center of the electronic device. It connects various parts of the electronic device via various interfaces and lines, and performs various functions and processes data by running or executing software programs and / or modules stored in the memory 302, and by calling data stored in the memory 302, thereby providing overall monitoring of the electronic device. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 301.

[0132] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and data processing by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0133] The electronic device also includes a power supply 303 that supplies power to various components. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 303 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0134] The electronic device may also include an input unit 304, which can be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0135] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 301 in the electronic device loads the executable files corresponding to the processes of one or more applications into the memory 302 according to the following instructions, and the processor 301 runs the applications stored in the memory 302 to realize various functions, as follows:

[0136] Obtain the operating status of the energy storage system;

[0137] Monitor the temperature data of the cells in the energy storage system;

[0138] Based on the temperature data and the operating status, a temperature control strategy for the liquid cooling system in the energy storage system is determined.

[0139] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0140] Therefore, embodiments of this application provide a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk, etc. A computer program is stored thereon, which is loaded by a processor to execute the steps in the temperature control method of any of the energy storage systems provided in this application. For example, the computer program loaded by the processor can execute the following steps:

[0141] Obtain the operating status of the energy storage system;

[0142] Monitor the temperature data of the cells in the energy storage system;

[0143] Based on the temperature data and the operating status, a temperature control strategy for the liquid cooling system in the energy storage system is determined.

[0144] This application also provides a computer program product, including a computer program / instructions, which, when executed by a processor, are used to perform steps in the temperature control method of any of the energy storage systems provided in the application embodiments.

[0145] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0146] In practice, each of the above units or structures can be implemented as an independent entity or can be arbitrarily combined to be implemented as the same or several entities. For the specific implementation of each of the above units or structures, please refer to the previous method embodiments, which will not be repeated here.

[0147] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A temperature control method for an energy storage system, characterized in that, The method includes: Obtain the operating status of the energy storage system; Monitor the temperature data of the cells in the energy storage system; Based on the temperature data and the operating status, a temperature control strategy for the liquid cooling system in the energy storage system is determined.

2. The temperature control method for an energy storage system according to claim 1, characterized in that, The acquisition of the operating status of the energy storage system includes: In the first scenario where the energy storage system is in a state where the charging and discharging time can be predicted in advance, the working state is determined to be either a static state or a charging and discharging state based on the charging and discharging operation schedule corresponding to the first scenario. In the second scenario where the energy storage system is in a state where the charging and discharging time is unpredictable, the working state is determined to be either a static state or a charging and discharging state based on the real-time charging and discharging situation corresponding to the second scenario.

3. The temperature control method for the energy storage system according to claim 2, characterized in that, The step of determining the temperature control strategy for the liquid cooling system in the energy storage system based on the temperature data and the operating status includes: When the working state is the charging and discharging state, the temperature control strategy is determined based on the temperature data and the first temperature threshold under the charging and discharging state; When the working state is the stationary state, the temperature control strategy is determined based on the temperature data and the second temperature threshold in the stationary state.

4. The temperature control method for the energy storage system according to claim 3, characterized in that, The temperature data includes the average temperature of the battery cell, and the first temperature threshold includes a first low temperature threshold and a first high temperature threshold; determining the temperature control strategy based on the temperature data and the first temperature threshold under the charging and discharging state includes: When the average temperature is less than or equal to the first low temperature threshold, the temperature control strategy is determined to control the liquid cooling system to start the heating mode. At each first preset time interval, it is determined whether the current average temperature is less than or equal to the first low temperature threshold, until the current average temperature is greater than or equal to the first high temperature threshold, at which point the temperature control strategy is determined to control the liquid cooling system to exit the heating mode.

5. The temperature control method for an energy storage system according to claim 4, characterized in that, The first temperature threshold includes a second high temperature threshold that is greater than the first high temperature threshold; determining the temperature control strategy based on the temperature data and the first temperature threshold under the charging / discharging state includes: When the average temperature is greater than the first low temperature threshold and less than or equal to the second high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to enter the self-circulation mode. At every second preset time interval, the step of determining that the temperature control strategy is to control the liquid cooling system to enter the self-circulation mode is continued when the average temperature is greater than the first low temperature threshold and less than or equal to the second high temperature threshold.

6. The temperature control method for an energy storage system according to claim 3, characterized in that, The temperature data includes the average temperature and the highest temperature of the battery cell. The first temperature threshold includes a second high temperature threshold, a third high temperature threshold, a fourth high temperature threshold that is greater than the second high temperature threshold and less than the third high temperature threshold, and a fifth high temperature threshold that is less than the second high temperature threshold. The temperature control strategy is determined based on the temperature data and the first temperature threshold under the charging and discharging state. The step of determining the temperature control strategy based on the temperature data and the first temperature threshold under the charging and discharging state includes: When the average temperature is greater than the second high temperature threshold and the highest temperature is less than the third high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the first-level cooling mode. When the highest temperature is less than the third high temperature threshold, or the average temperature is less than the fifth high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the first-level cooling mode. When the average temperature is greater than the second high temperature threshold and the highest temperature is greater than or equal to the third high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the secondary cooling mode. When the highest temperature is less than or equal to the fourth high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the secondary cooling mode. The first cooling power corresponding to the primary cooling mode and the second cooling power corresponding to the secondary cooling mode are calculated and determined according to the current heat generation power of the energy storage system by performing a first gain and a second gain, respectively. The first gain is less than the second gain.

7. The temperature control method for an energy storage system according to claim 6, characterized in that, The method further includes: The energy storage system was subjected to heat generation simulation test to obtain the corresponding relationship between the test heat generation power under different test charge and discharge rates under different test charge states; Based on the correspondence, the current heat generation power of the energy storage system at the current charge / discharge rate under the current state of charge is determined.

8. The temperature control method for an energy storage system according to claim 3, characterized in that, The temperature data includes the highest and lowest temperatures of the battery cell, and the second temperature threshold includes a second low temperature threshold, a third low temperature threshold greater than the second low temperature threshold, a sixth high temperature threshold, and a seventh high temperature threshold less than the sixth high temperature threshold. Based on the temperature data and the second temperature threshold under the static state, the temperature control strategy is determined, including: When the lowest temperature is less than or equal to the second low temperature threshold, and the highest temperature is less than the sixth high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the heating mode. Every third preset time interval, it is determined whether the current minimum temperature is greater than or equal to the third low temperature threshold. When the current minimum temperature is greater than or equal to the third low temperature threshold, the temperature control strategy is determined to control the liquid cooling system to exit the heating mode. If the highest temperature is greater than or equal to the sixth high temperature threshold, the temperature control strategy is determined to be to control the liquid cooling system to start the three-level cooling mode. Every fourth preset time interval, it is determined whether the current highest temperature is less than or equal to the seventh high temperature threshold. When the current highest temperature is less than or equal to the seventh high temperature threshold, the temperature control strategy is determined to control the liquid cooling system to enter or exit the third-level cooling mode.

9. The temperature control method for an energy storage system according to claim 8, characterized in that, The three-level cooling mode corresponds to the preset cooling power.

10. An electronic device, characterized in that, It includes a memory and a processor; the memory stores an application program, and the processor runs the application program within the memory to perform the steps in the temperature control method of the energy storage system according to any one of claims 1 to 9.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that is executed by a processor to implement the steps in the temperature control method for the energy storage system according to any one of claims 1 to 9.

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