Energy storage system thermal management method, device, equipment, medium and product

Abstract

The application provides a kind of energy storage system heat management method, device, equipment, medium and product, it is related to energy storage technical field.The method comprises: obtaining the external environment temperature of current energy storage system, load state, battery charge state (SOC) and battery temperature;Determine the current heat management operation mode according to the external environment temperature, and the heat management operation mode includes extreme cold mode, cold mode, mild mode and high temperature mode;In the current heat management operation mode, a predetermined heat management strategy is used to determine the liquid cooling system water temperature threshold based on load state, SOC and battery temperature;Target dehumidification threshold is calculated based on the liquid cooling system water temperature threshold, to control the dehumidifier to operate according to the target dehumidification threshold.The method of the application realizes efficient, accurate temperature control and energy consumption optimization through joint analysis of environmental temperature, operating state and SOC, while avoiding condensation risk, significantly improving the safety and life of energy storage system.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a thermal management method, device, equipment, medium and product for an energy storage system. Background Technology

[0002] Energy storage systems are a core component of modern energy networks, widely used in grid peak shaving, renewable energy grid integration, and data center power supply. The thermal management performance of a battery system directly determines its safety, operating efficiency, and lifespan. Extreme environmental conditions and frequent switching between charge and discharge conditions can cause cell temperature fluctuations, leading to thermal runaway, capacity decay, and other problems, threatening system stability. Therefore, designing a dynamic adaptive thermal management strategy that integrates ambient temperature, load conditions, and cell characteristics is a key technical requirement for improving energy storage system performance.

[0003] Currently, the thermal management strategy of liquid-cooled energy storage systems mainly involves real-time monitoring of cell temperature and liquid cooler water temperature, using fixed thresholds or simple logic to control the start and stop of the liquid cooler to maintain the cell temperature within a preset range. In high-temperature environments, the system will activate the liquid cooler for continuous forced cooling; in low-temperature environments, it will use electric heating devices to raise the cell temperature, thereby ensuring the basic operational needs of the battery.

[0004] However, the thermal management decision-making process does not integrate ambient temperature, load status, and cell state of charge, making it difficult to achieve adaptive temperature control and resulting in a mismatch between cooling energy consumption and the actual needs of the cells. Furthermore, the liquid cooling system's water temperature and cabin humidity control are independent, making it impossible to avoid the risk of condensation. Summary of the Invention

[0005] This application provides a thermal management method, device, equipment, medium, and product for an energy storage system to solve the problems of poor environmental adaptability, insufficient load response, and high risk of condensation in traditional thermal management strategies.

[0006] In a first aspect, this application provides a thermal management method for an energy storage system, the method comprising:

[0007] Acquire the current ambient temperature, load status, state of charge (SOC) of the battery cells, and cell temperature of the energy storage system.

[0008] The current thermal management operation mode is determined based on the external ambient temperature. The thermal management operation modes include extreme cold mode, cold mode, mild mode, and high temperature mode.

[0009] In the current thermal management operation mode, a preset thermal management strategy is used to determine the water temperature threshold of the liquid cooling system based on the load status, SOC, and cell temperature.

[0010] The target dehumidification threshold is calculated based on the water temperature threshold of the liquid cooling system, so as to control the dehumidifier to operate according to the target dehumidification threshold.

[0011] In one possible design, the step of determining the liquid cooling system water temperature threshold based on load status, SOC, and cell temperature using a preset thermal management strategy under the current thermal management operating mode includes:

[0012] Obtain the base water temperature range corresponding to the current thermal management operation mode;

[0013] Within the basic water temperature range, the reference water temperature value is adjusted according to the current load status of the energy storage system;

[0014] Determine the current SOC stage based on the cell's SOC value;

[0015] The current liquid cooling system water temperature threshold is determined by combining the current SOC stage and the current cell temperature.

[0016] In one possible design, calculating the target dehumidification threshold based on the liquid cooling system water temperature threshold to control the dehumidifier to operate according to the target dehumidification threshold includes:

[0017] Get the current temperature and humidity inside the battery compartment;

[0018] The dew point temperature inside the battery compartment is calculated based on the current temperature and humidity inside the battery compartment using a preset dew point temperature calculation model.

[0019] If the water temperature threshold of the liquid cooling system is less than or equal to the dew point temperature inside the cabin, the target dehumidification threshold will be adjusted to a humidity value lower than the dew point temperature inside the cabin.

[0020] If the water temperature threshold of the liquid cooling system is greater than the dew point temperature inside the cabin, the target dehumidification threshold will be adjusted to a humidity value higher than the dew point temperature inside the cabin.

[0021] In one possible design, the load state includes a charging mode, a post-charging mode, a discharging mode, and a post-discharging mode; the method further includes:

[0022] In high-temperature mode, when the load status is post-charge or post-discharge mode, the liquid cooling unit is turned on in advance to pre-cool the cell temperature to the preset cold standby temperature range.

[0023] One possible design also includes:

[0024] Obtain the maximum and minimum values ​​of the cell temperature;

[0025] Calculate the temperature difference between the maximum and minimum cell temperatures;

[0026] If the temperature difference of the battery cell is greater than or equal to the preset temperature difference threshold, the flow rate of the liquid cooling system is adjusted.

[0027] One possible design also includes:

[0028] Obtain the runtime of the energy storage system;

[0029] If the accumulated runtime reaches the preset maintenance cycle, the liquid cooling system water temperature threshold is increased according to the preset temperature adjustment range and maintained for the preset duration.

[0030] Secondly, this application provides a thermal management device for an energy storage system, the device being located in the BAMS software control system of the energy storage system, the device comprising:

[0031] The acquisition module is used to acquire the current external ambient temperature, load status, cell charge status (SOC), and cell temperature of the energy storage system.

[0032] The determination module is used to determine the current thermal management operation mode based on the external ambient temperature. The thermal management operation mode includes extreme cold mode, cold mode, mild mode and high temperature mode.

[0033] The determining module is also used to determine the water temperature threshold of the liquid cooling system based on the load state, SOC and cell temperature using a preset thermal management strategy under the current thermal management operation mode.

[0034] The calculation module is used to calculate the target dehumidification threshold based on the water temperature threshold of the liquid cooling system, so as to control the dehumidifier to operate according to the target dehumidification threshold.

[0035] Thirdly, this application provides a thermal management device, the device comprising: a processor, and a memory communicatively connected to the processor;

[0036] The memory stores computer-executed instructions;

[0037] The processor executes computer execution instructions stored in the memory to implement the method as described in the first aspect.

[0038] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the method described in any of the first aspects above.

[0039] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method described in any of the first aspects above.

[0040] The thermal management method, device, equipment, medium, and product for energy storage systems provided in this application, by acquiring the external ambient temperature, subdivides the thermal management operation mode into extreme cold mode, cold mode, mild mode, and high temperature mode. This allows the energy storage system to take targeted thermal management measures for different environments, thereby ensuring the stable operation of the energy storage system under various complex environments. After determining the operation mode, the load state, cell charge state (SOC), and cell temperature are comprehensively considered. The load state reflects the current working state of the energy storage system, and different loads generate different amounts of heat; the cell charge state affects the chemical reaction activity and heat generation of the cell; and the cell temperature directly affects the cell's performance and lifespan. Based on the above factors, a preset thermal management strategy is adopted to determine the water temperature threshold of the liquid cooling system, making water temperature control more precise and refined. Based on the liquid cooling system water temperature threshold, a target dehumidification threshold is calculated, and the dehumidifier is controlled to operate according to this threshold. This can effectively regulate the internal humidity of the system, preventing condensation on the cell surface due to excessive humidity, which could lead to short circuits and other safety issues. At the same time, it avoids problems such as cell drying and decreased insulation performance due to excessively low humidity, ensuring the stability of the internal environment of the energy storage system. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0042] Figure 1 This is an application scenario diagram of the thermal management method for an energy storage system provided in an embodiment of this application;

[0043] Figure 2 A flowchart illustrating a thermal management method for an energy storage system provided in an embodiment of this application;

[0044] Figure 3 A flowchart illustrating a thermal management method for an energy storage system provided in another embodiment of this application;

[0045] Figure 4 A schematic diagram of the structure of a thermal management device for an energy storage system provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the structure of a thermal management device provided in an embodiment of this application.

[0047] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0048] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0049] It should be noted that certain software, components, and models may be mentioned in the embodiments of this application. These should be considered as exemplary and are intended only to illustrate the feasibility of implementing the technical solution of this application. However, they do not mean that the applicant has used or necessarily used the solution.

[0050] To clearly understand the technical solution of this application, the solutions of the prior art will be described in detail first.

[0051] Energy storage systems, as a key component of modern energy networks, are widely used in various fields such as grid peak shaving, new energy grid connection, and data center power supply. The thermal management level of battery systems directly affects the operational safety, efficiency, and lifespan of energy storage systems. Under the dual influence of extreme environmental conditions and frequent charge-discharge switching, cell temperatures are prone to significant fluctuations, leading to problems such as thermal runaway and capacity decay, seriously threatening the stable operation of the system. Therefore, developing a dynamic adaptive thermal management strategy that integrates ambient temperature, load status, and cell characteristics is a core technological direction for improving the overall performance of energy storage systems. Currently, the thermal management strategy of liquid-cooled energy storage systems mainly relies on real-time monitoring data of cell temperature and liquid cooler water temperature, using fixed thresholds or simple logic to control the start and stop of the liquid cooler to maintain the cell temperature within a preset range. Specifically, in high-temperature environments, the liquid cooler is activated for continuous forced cooling, while in low-temperature environments, electric heating devices are used to raise the cell temperature to ensure the basic operational needs of the battery. However, this strategy has significant shortcomings. Its thermal management decisions do not take into account ambient temperature, load status, and cell charge status, making it difficult to achieve adaptive temperature control and resulting in a mismatch between cooling energy consumption and the actual needs of the cells. At the same time, the control of liquid cooling system water temperature and cabin humidity are independent, making it impossible to effectively avoid the risk of condensation.

[0052] Therefore, when facing the technical problems in existing technologies, relying solely on cell temperature and liquid cooler water temperature for thermal management control cannot achieve adaptive and precise temperature control of the liquid cooling system in response to the external environment. This paper introduces four core monitoring parameters: ambient temperature, load status, cell SOC, and cell temperature. Based on the external ambient temperature, four thermal management operation modes are defined: extremely cold, cold, mild, and high temperature. A multi-dimensional temperature control framework is established, and a dual-layer correction logic of load status and SOC is superimposed on each mode to output a precise liquid cooling system water temperature threshold, ensuring dynamic matching between the thermal management strategy and the actual operating conditions of the cells. To further improve the adaptability of the liquid cooling system water temperature threshold to the energy storage system's operating state, a pre-set linkage control rule for load status and SOC stages is used. Differentiated water temperature adjustment strategies are formulated for different load modes such as charging, discharging, and idle, as well as different charging stages such as low SOC, plateau SOC, and high SOC. This matches the heat generation characteristics of the cells under different operating conditions, achieving a balance between temperature control accuracy and energy consumption optimization. To address the challenge of mitigating condensation risks, a linkage control mechanism between the liquid cooling system's water temperature threshold and dehumidification threshold is established. Based on the liquid cooling water temperature threshold, the target dehumidification threshold inside the cabin is derived in reverse, driving the dehumidifier to dynamically adjust its operating parameters. This eliminates the temperature and humidity difference between the liquid cooling pipeline and the cabin air, preventing condensation from its source and ensuring the safe operation of the system.

[0053] Figure 1 This is an application scenario diagram of the thermal management method for an energy storage system provided in an embodiment of this application, such as... Figure 1 As shown in the diagram, the application scenario of the thermal management method for the energy storage system provided in this embodiment includes: an energy storage system 101, a BAMS software control system 102, and an environmental monitoring device 103. The thermal management device of the energy storage system is integrated into the BAMS software control system 102.

[0054] Specifically, the BAMS software control system 102 obtains the current external ambient temperature of the energy storage system from the environmental monitoring device 103 in real time, and obtains the current load status, cell charge status (SOC), and cell temperature of the energy storage system 101. Based on the external ambient temperature, the BAMS software control system 102 determines the current thermal management operation mode. After determining the current thermal management operation mode, it uses a preset thermal management strategy to determine the liquid cooling system water temperature threshold based on the load status, SOC, and cell temperature, so that the liquid cooling system in the energy storage system 101 controls the water temperature based on this water temperature threshold. The BAMS software control system 102 then calculates the target dehumidification threshold based on the liquid cooling system water temperature threshold, so as to control the dehumidifier in the energy storage system 101 to operate according to the target dehumidification threshold.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] Figure 2 A flowchart of a thermal management method for an energy storage system provided in an embodiment of this application is shown below. Figure 2 As shown, the execution entity in this embodiment is a BAMS software control system, which is equipped with a thermal management device for an energy storage system. This thermal management device can be implemented through a computer program, or through a medium storing the relevant computer program, such as a USB flash drive and / or optical disc, or it can be integrated into a thermal management device within the energy storage system. The thermal management device method provided in this embodiment includes the following steps:

[0057] Step 201: Obtain the current external ambient temperature, load status, state of charge (SOC) of the battery cell, and battery cell temperature of the energy storage system.

[0058] Among them, the external ambient temperature refers to the real-time ambient temperature outside the energy storage system integrated compartment.

[0059] Among them, load status refers to the real-time operating conditions of the energy storage battery system, such as charging mode, post-charging mode, discharging mode, and post-discharging mode.

[0060] Among them, the state of charge (SOC) of the battery cell refers to the percentage of the current remaining charge of the battery cell relative to its rated capacity, with a value range of 0% to 100%.

[0061] Among them, cell temperature refers to the real-time operating temperature of each cell in the energy storage battery system.

[0062] It is understandable that high-precision temperature sensors are installed on the outer wall of the energy storage system integration cabin, with the sensor's detection end directly contacting the outside air environment.

[0063] Specifically, the sensors continuously collect ambient temperature data from outside the cabin at a preset sampling frequency, converting the collected analog signals into digital signals and transmitting them to the BAMS software control system in real time. A communication connection is established with the energy management system of the energy storage system to read the current flow and operating commands of the battery system in real time. When current is detected from the grid input to the battery system, the system is determined to be in charging mode; after the charging process is completed, if the battery system has no charging or discharging current and is in a static state, it is determined to be in post-charging mode; when current is detected from the battery system output to the grid or load, it is determined to be in discharging mode; after the discharging process is completed, if the battery system has no charging or discharging current and is in a static state, it is determined to be in post-discharging mode.

[0064] Furthermore, a composite estimation method combining the ampere-hour integration method and the open-circuit voltage method is adopted. By using a current sensor connected in series in the battery circuit, the charging and discharging current is collected in real time and the change in charge is accumulated to obtain a preliminary SOC estimate. At the same time, the open-circuit voltage of the battery cell is collected, and the estimated value is calibrated using a preset voltage-SOC curve to finally obtain an accurate SOC value, which is then transmitted to the BAMS software control system.

[0065] Understandably, distributed temperature sensors are placed among the cells within the energy storage battery pack, with each sensor monitoring the temperature of a corresponding group of cells. The sensors collect the operating temperature of the cells in real time and transmit the data to the BAMS software control system. The system synchronously records the real-time temperature of all cells and simultaneously calculates the maximum and minimum cell temperatures.

[0066] Step 202: Determine the current thermal management operation mode based on the external ambient temperature. The thermal management operation modes include extreme cold mode, cold mode, mild mode, and high temperature mode.

[0067] Among them, thermal management operation mode refers to a set of differentiated temperature control strategies based on the external ambient temperature of the energy storage system.

[0068] Specifically, four levels of ambient temperature thresholds are preset as the basis for determining the mode. For example, when the ambient temperature is ≤-15℃, it corresponds to the extreme cold mode; when -15℃ < ambient temperature ≤ 5℃, it corresponds to the cold mode; when 5℃ < ambient temperature < 25℃, it corresponds to the mild mode; and when the ambient temperature is ≥25℃, it corresponds to the high temperature mode.

[0069] Furthermore, the real-time data transmitted from the received external ambient temperature sensor is compared one by one with the preset four-level temperature thresholds to determine the current ambient temperature range and thus the current thermal management operation mode. The corresponding preset control strategy is then retrieved. For example, in extreme cold / cold mode, the heating function of the liquid cooling unit is prioritized, while natural cooling is prioritized when cooling demand is triggered. In mild mode, the water temperature reference range corresponding to the optimal lifespan temperature of the battery cells is retrieved to maintain efficient and low-consumption operation of the liquid cooling system. In high-temperature mode, the pre-cooling control logic is retrieved to start the liquid cooling unit in advance to lower the battery cell temperature to the cold standby range.

[0070] Optionally, when the external ambient temperature changes over time and crosses the threshold, the BAMS software control system will automatically trigger a mode switching process to smoothly transition the temperature control strategy and avoid large fluctuations in cell temperature due to sudden mode changes. During the switching process, the liquid cooling system water temperature reference and dehumidification linkage parameters will be updated simultaneously.

[0071] Step 203: Under the current thermal management operation mode, a preset thermal management strategy is adopted to determine the water temperature threshold of the liquid cooling system based on the load status, SOC and cell temperature.

[0072] Among them, the preset thermal management strategy refers to the set of multi-dimensional temperature control logic pre-stored in the BAMS software control system.

[0073] The liquid cooling system temperature threshold refers to the target temperature value at which the liquid cooling unit delivers coolant to the battery system. The liquid cooling system stabilizes the coolant temperature within this threshold range by adjusting the cooling or heating power, thereby controlling the cell temperature.

[0074] Specifically, based on the determined thermal management operation mode, the preset base water temperature range is retrieved. For example, in extreme cold and cold modes, the base water temperature range is higher to prioritize ensuring the activity of the battery cells; in mild mode, the base water temperature range is the optimal lifespan range for the battery cells, balancing energy consumption and lifespan; in high temperature mode, the base water temperature range is lower to enhance the cooling effect to cope with high ambient temperatures.

[0075] Furthermore, the current load status of the energy storage system is read, and the water temperature reference value is adjusted within the basic water temperature range. For example, the water temperature reference value is lowered in charging mode to suppress heat generation from charging polarization; in post-charging mode, the water temperature reference value is further lowered to meet the precise temperature control requirements when the system is idle at high SOC; in discharging mode, the water temperature reference value is increased to avoid damage to the battery cells during low-temperature discharge; and in post-discharging mode, the water temperature reference value is raised again to reduce cooling power consumption when the system is idle at low SOC.

[0076] Furthermore, based on the current SOC value of the battery cell, the stage is determined, and the water temperature reference value obtained in the second step is adjusted a second time. For example, in the low SOC (≤30%) and high SOC (≥80%) stages, the water temperature reference value is lowered again due to the increased heat generation from end polarization; in the plateau SOC (30%~80%) stage, the heat generation is stable, and the current water temperature reference value is maintained to reduce system power consumption.

[0077] Furthermore, the real-time temperature of all battery cells is collected and compared with the optimal temperature range under this operating condition to perform closed-loop calibration. If the battery cell temperature is higher than the upper limit of the optimal range, the water temperature reference value is lowered based on the second correction to increase the cooling effect; if the battery cell temperature is lower than the lower limit of the optimal range, the water temperature reference value is raised based on the second correction, or the liquid cooling unit is switched to heating mode; if the battery cell temperature is within the optimal range, the water temperature reference value after the second correction is determined as the final water temperature threshold of the liquid cooling system.

[0078] Step 204: Calculate the target dehumidification threshold based on the water temperature threshold of the liquid cooling system, so as to control the dehumidifier to operate according to the target dehumidification threshold.

[0079] The target dehumidification threshold refers to the pre-set target value of relative humidity in the battery compartment to prevent condensation. The dehumidifier will start, stop, or adjust its operating power according to this threshold to maintain the humidity in the compartment within the threshold range.

[0080] Specifically, temperature and humidity sensors are placed at different locations within the battery compartment to continuously collect real-time air temperature and relative humidity data, which is then fed back to the BAMS software control system. A preset dew point temperature calculation model is invoked, and combined with the collected real-time temperature and relative humidity data, the dew point temperature of the air in the current environment is calculated. The dew point temperature is the critical temperature at which air moisture condenses into liquid water; condensation occurs when the surface temperature of the pipes is below this value. The water temperature threshold of the liquid cooling system is converted into the equivalent surface temperature of the liquid cooling pipes, and then compared with the dew point temperature: if the equivalent surface temperature of the pipes is less than or equal to the dew point temperature, a condensation risk is identified, and the target dehumidification threshold is immediately lowered, increasing the dehumidifier's operating power to quickly reduce the relative humidity in the compartment until the dew point temperature is lower than the equivalent surface temperature of the pipes; if the equivalent surface temperature of the pipes is greater than the dew point temperature, no condensation risk is identified, and the target dehumidification threshold is appropriately raised, reducing the dehumidifier's operating power or switching to intermittent operation mode to reduce system auxiliary power consumption.

[0081] The thermal management method for energy storage systems provided in this application, by acquiring the external ambient temperature, subdivides the thermal management operation mode into extreme cold mode, cold mode, mild mode, and high temperature mode. This allows the energy storage system to adopt targeted thermal management measures for different environments, thereby ensuring stable operation of the energy storage system under various complex conditions. After determining the operation mode, the load state, cell charge state (SOC), and cell temperature are comprehensively considered. The load state reflects the current operating state of the energy storage system, and different loads generate different amounts of heat; the cell charge state affects the chemical reaction activity and heat generation of the cell; and the cell temperature directly affects the cell's performance and lifespan. Based on the above factors, a preset thermal management strategy is adopted to determine the water temperature threshold of the liquid cooling system, making water temperature control more precise and refined. Based on the liquid cooling system water temperature threshold, a target dehumidification threshold is calculated, and the dehumidifier is controlled to operate according to this threshold. This can effectively regulate the internal humidity of the system, preventing condensation on the cell surface due to excessive humidity, which could lead to short circuits and other safety issues. At the same time, it avoids problems such as cell drying and decreased insulation performance due to excessively low humidity, ensuring the stability of the internal environment of the energy storage system.

[0082] As an optional implementation, based on the above embodiments, under the current thermal management operation mode, a preset thermal management strategy is adopted to determine the water temperature threshold of the liquid cooling system based on the load state, SOC, and cell temperature, including:

[0083] Obtain the base water temperature range corresponding to the current thermal management operation mode;

[0084] Within the basic water temperature range, the reference water temperature value is adjusted according to the current load status of the energy storage system;

[0085] Determine the current SOC stage based on the cell's SOC value;

[0086] The current liquid cooling system water temperature threshold is determined by combining the current SOC stage and the current cell temperature.

[0087] The basic water temperature range refers to the preset range of coolant temperature in the liquid cooling system under different thermal management operation modes.

[0088] The reference water temperature value refers to the intermediate control temperature of the coolant determined in combination with the load status of the energy storage system within the basic water temperature range.

[0089] Among them, the SOC stage refers to the intervals divided according to the state of charge of the battery cell, such as the low SOC stage (≤30%), the plateau SOC stage (30%~80%), and the high SOC stage (≥80%).

[0090] Specifically, after determining the current thermal management operating mode, the BAMS software control system automatically retrieves the pre-stored baseline water temperature range for that mode. It reads the current load status of the energy storage system and determines a reference water temperature value within the retrieved baseline water temperature range. For example, in charging mode, the reference water temperature value is lowered to suppress heat generation from charging polarization; in post-charging mode, the reference water temperature value is further lowered to meet the precise temperature control requirements during high SOC storage; in discharging mode, the reference water temperature value is increased to avoid damage to the battery cells during low-temperature discharge; and in post-discharging mode, the reference water temperature value is further increased to reduce cooling power consumption during low SOC storage.

[0091] Furthermore, the system receives the cell's State of Charge (SOC) value calibrated using the ampere-hour integration method and the open-circuit voltage method, compares this value with a preset SOC stage division standard to determine the current SOC stage. Based on the current SOC stage, the reference water temperature value is corrected a second time. For example, in the low and high SOC stages, due to increased heat generation from terminal polarization, the reference water temperature value is lowered; during the plateau SOC stage, heat generation is stable, and the reference water temperature value remains unchanged. Subsequently, the system collects the real-time temperature of the cell and compares it with the optimal temperature range under the corresponding operating conditions for final calibration. If the cell temperature is higher than the upper limit of the optimal range, it is lowered again based on the second-corrected temperature; if the cell temperature is lower than the lower limit of the optimal range, it is raised again based on the second-corrected temperature; if the cell temperature is within the optimal range, the second-corrected temperature is determined as the final liquid cooling system water temperature threshold.

[0092] The thermal management method for energy storage systems provided in this application adjusts the reference water temperature value according to the current load state, enabling the liquid cooling system to more accurately match the actual heat generation of the system and ensuring the safe operation of the energy storage system. Determining the water temperature threshold by combining the current SOC stage and cell temperature allows for a more comprehensive consideration of the cell's operating state, ensuring that the liquid cooling system can effectively and promptly control the cell temperature and prevent abnormal temperature from affecting cell performance and lifespan. Using the actual cell temperature as a crucial basis for determining the water temperature threshold ensures that the cell temperature is always controlled within a reasonable range, extending the cell's lifespan and improving the accuracy and effectiveness of thermal management. Employing a preset thermal management strategy, accurately determining the water temperature threshold based on load state, SOC, and cell temperature, avoids over-operation of the liquid cooling system and reduces unnecessary energy consumption.

[0093] As an optional implementation, based on the above embodiments, a target dehumidification threshold is calculated based on the water temperature threshold of the liquid cooling system to control the dehumidifier to operate according to the target dehumidification threshold, including:

[0094] Get the current temperature and humidity inside the battery compartment;

[0095] The dew point temperature inside the battery compartment is calculated based on the current temperature and humidity inside the battery compartment using a preset dew point temperature calculation model.

[0096] If the water temperature threshold of the liquid cooling system is less than or equal to the dew point temperature inside the cabin, the target dehumidification threshold will be adjusted to a humidity value lower than the dew point temperature inside the cabin.

[0097] If the water temperature threshold of the liquid cooling system is greater than the dew point temperature inside the cabin, the target dehumidification threshold will be adjusted to a humidity value higher than the dew point temperature inside the cabin.

[0098] Dew point temperature refers to the critical temperature at which water vapor in the air condenses into liquid water under the current environmental pressure and humidity conditions. When the surface temperature of an object is lower than this value, water vapor in the air will condense on its surface.

[0099] The preset dew point temperature calculation model refers to an algorithm model built based on the principles of air thermodynamics, which can accurately calculate the dew point temperature under the corresponding environment based on the input cabin temperature and relative humidity.

[0100] Specifically, the BAMS software control system continuously collects real-time temperature and relative humidity data within the battery compartment using temperature and humidity sensors deployed at different locations. It then calls upon a pre-stored dew point temperature calculation model, substituting the collected real-time temperature and relative humidity data into the model for calculations. This model has been pre-calibrated through extensive environmental experiments and can accurately output the dew point temperature corresponding to the current environment within the compartment.

[0101] Furthermore, the liquid cooling system water temperature threshold is converted into the equivalent surface temperature of the liquid cooling pipes. When this equivalent temperature is less than or equal to the cabin dew point temperature, a risk of condensation is identified. The target dehumidification threshold is then lowered to a value lower than the relative humidity value corresponding to the current dew point temperature. Simultaneously, the dehumidifier's operating power is increased to rapidly reduce the cabin humidity until the dew point temperature is lower than the equivalent surface temperature of the pipes. When the equivalent surface temperature of the liquid cooling pipes is greater than the cabin dew point temperature, no risk of condensation is identified. The target dehumidification threshold is then appropriately increased to a value higher than the relative humidity value corresponding to the current dew point temperature. Simultaneously, the dehumidifier's operating power is reduced or switched to intermittent operation mode to minimize auxiliary power consumption while ensuring no condensation.

[0102] The thermal management method for the energy storage system provided in this application dynamically adjusts the target dehumidification threshold based on the relationship between the liquid cooling system water temperature threshold and the dew point temperature inside the battery compartment. This ensures that the ambient humidity remains within a safe range that prevents condensation, reducing issues such as battery short circuits and corrosion, and improving battery life. Simultaneously, it avoids excessive dehumidification, preventing problems such as static electricity buildup due to overly dry batteries. It also provides a good operating environment for other electronic devices within the battery compartment, ensuring the stable operation of the entire system.

[0103] As an optional implementation, based on the above embodiments, the load state includes charging mode, post-charging mode, discharging mode, and post-discharging mode; the method further includes:

[0104] In high-temperature mode, when the load status is post-charging or post-discharging, the liquid cooling unit is turned on in advance to pre-cool the cell temperature to the preset cold standby temperature range.

[0105] The post-charging mode refers to the static state of the battery system after the energy storage system has completed the charging process. The battery system neither receives charging from the grid nor discharges externally. At this time, the cell SOC is at a high level and is more sensitive to temperature changes.

[0106] Among them, the post-discharge mode refers to the state in which the battery system is in a static state without charging or discharging current after the energy storage system has completed the discharge process. At this time, the cell SOC is at a low level and the temperature sensitivity is relatively low.

[0107] Among them, the preset cold standby temperature range refers to the optimal temperature range for the battery cell to operate under high temperature conditions, such as 20℃-25℃.

[0108] Specifically, the BAMS software control system continuously monitors the current flow and operating commands of the energy storage system to determine the current load status in real time. When the system is in high-temperature mode, it filters whether the load status is in post-charging or post-discharging mode. If both the high-temperature mode and post-charging / post-discharging mode conditions are met simultaneously, the pre-cooling control logic is triggered. A start command is sent to the liquid chiller unit, which operates according to the preset pre-cooling water temperature threshold in high-temperature mode. This water temperature threshold is lower than the water temperature value under normal static conditions.

[0109] Optionally, distributed temperature sensors continuously collect real-time temperature data of the battery cells and feed it back to the BAMS system. The collected cell temperatures are compared with preset cold standby temperature ranges. When the cell temperature drops to the upper limit of the cold standby temperature range, the liquid cooling unit maintains its current power operation; when the cell temperature reaches the lower limit of the cold standby temperature range, the liquid cooling unit switches to intermittent operation mode to avoid over-cooling and energy waste.

[0110] The thermal management method for the energy storage system provided in this application addresses the issue that, under high-temperature environments, the internal resistance of the battery increases, leading to increased energy loss and reduced efficiency during charging and discharging. By pre-cooling the battery cells to a preset cold standby temperature range by activating the liquid cooling unit in advance, the internal resistance of the battery can be reduced, energy loss decreased, and the charging and discharging efficiency of the battery improved. Furthermore, pre-cooling the battery cells by activating the liquid cooling unit in advance can effectively lower the battery's operating temperature, slow down the rate of internal chemical reactions, and thus extend the battery's lifespan.

[0111] As an optional implementation, based on the above embodiments, it further includes:

[0112] Obtain the maximum and minimum values ​​of the cell temperature;

[0113] Calculate the temperature difference between the maximum and minimum cell temperatures;

[0114] If the cell temperature difference is greater than or equal to the preset temperature difference threshold, adjust the flow rate of the liquid cooling system.

[0115] Among them, cell temperature difference refers to the difference between the maximum and minimum real-time temperatures of all cells in the energy storage battery pack.

[0116] Among them, the preset temperature difference threshold refers to the pre-set safe upper limit of cell temperature difference. This value is determined according to the cell type and system operation requirements. Exceeding this threshold will affect battery performance and lifespan.

[0117] The flow rate of the liquid cooling system refers to the circulation speed of the coolant in the liquid cooling pipeline. Adjusting the flow rate can change the heat exchange efficiency between the coolant and the battery cell, thereby regulating the temperature uniformity of the battery cell.

[0118] Specifically, the BAMS software control system receives real-time temperature data from all battery cells collected by distributed temperature sensors deployed within the battery pack. This data is filtered in real-time to extract the maximum and minimum temperatures of all current battery cells, thus determining the extreme values ​​of temperature distribution within the battery pack. The maximum temperature value is subtracted from the minimum temperature value to calculate the current cell temperature difference. This calculated temperature difference is compared to a preset temperature difference threshold. If the temperature difference is greater than or equal to the threshold, the liquid cooling system flow adjustment mechanism is immediately triggered. The system controls the liquid cooling system's circulation pump to increase its operating power, increase the coolant circulation flow rate, improve heat exchange efficiency, accelerate the heat dissipation of high-temperature cells, and reduce the temperature difference between cells. When the cell temperature difference drops below the preset threshold, the system adjusts the liquid cooling system flow rate back to the baseline range to maintain a balanced cell temperature.

[0119] The thermal management method for energy storage systems provided in this application, by adjusting the flow rate of the liquid cooling system, can more effectively balance the temperature of the battery cells, ensuring that all cells are within a similar suitable temperature range, thereby maintaining the stability of the overall charge and discharge efficiency of the battery. When the temperature of some cells is too high, the internal chemical reactions will intensify, generating a large amount of heat. If this heat cannot be dissipated in time, it will trigger a chain reaction, leading to thermal runaway of the entire battery pack. By adjusting the flow rate of the liquid cooling system in a timely manner to enhance the cooling of high-temperature cells, the risk of thermal runaway can be effectively reduced, ensuring the safe operation of the energy storage system.

[0120] As an optional implementation, based on the above embodiments, it further includes:

[0121] Obtain the runtime of the energy storage system;

[0122] If the cumulative runtime reaches the preset maintenance cycle, the liquid cooling system water temperature threshold will be increased according to the preset temperature adjustment range and maintained for the preset duration.

[0123] Among them, runtime refers to the cumulative time that the energy storage system has been continuously put into operation since the last maintenance or startup was completed.

[0124] The preset maintenance cycle refers to the time interval at which the liquid cooling system needs to be maintained and its temperature adjusted.

[0125] The preset temperature adjustment range refers to the pre-set increase range of the liquid cooling system water temperature threshold for maintenance purposes.

[0126] The preset duration refers to the duration that needs to be maintained after the water temperature threshold of the liquid cooling system is increased.

[0127] Specifically, the BAMS software control system has a built-in timing module that starts timing from the moment the energy storage system completes its last maintenance temperature adjustment or its first startup, accumulating the system's runtime in real time. During the timing process, the system automatically excludes downtime, maintenance, and other non-operational periods. The accumulated runtime is compared with the preset maintenance cycle. If the runtime has not reached the preset maintenance cycle, the current liquid cooling system water temperature threshold remains unchanged, and the normal temperature control strategy continues. When the accumulated runtime reaches the preset maintenance cycle, the liquid cooling system water temperature threshold is increased according to the preset temperature adjustment range. The increased water temperature improves the coolant's fluidity and dissolves trace impurities deposited on the inner walls of the liquid cooling pipes, reducing the risk of pipe blockage. The increased water temperature threshold is maintained for a preset duration to ensure that impurities are fully dissolved and circulated with the coolant.

[0128] Optionally, after the preset duration ends, the liquid cooling system water temperature threshold will be reverted to the normal values ​​corresponding to the current thermal management mode, load status, and SOC. At the same time, the cumulative timer of the running duration will be reset, and the monitoring phase of the next maintenance cycle will begin.

[0129] The thermal management method for the energy storage system provided in this application addresses the issue that under long-term low-temperature operation, equipment may experience stress, leading to fatigue damage. Appropriately increasing the water temperature threshold and maintaining it for a period of time allows these components to operate under relatively mild temperature conditions, alleviating the stress caused by prolonged low temperatures, reducing component fatigue damage, and thus extending their service life. Batteries age at different rates under different temperature environments. While long-term low-temperature operation helps slow down the chemical aging of the battery, it may also cause stress on the internal mechanical structure. Increasing the water temperature threshold during maintenance cycles allows the battery to operate at a relatively higher temperature for a period of time, balancing the aging rate of different parts of the battery and preventing excessively rapid local aging from affecting the overall performance and lifespan of the battery.

[0130] Figure 3 A flowchart of a thermal management method for an energy storage system provided in another embodiment of this application is shown below. Figure 3 As shown, the thermal management method for the energy storage system provided in this embodiment includes the following steps:

[0131] Step 301: Obtain the current external ambient temperature, load status, state of charge (SOC) of the battery cell, and battery cell temperature of the energy storage system.

[0132] Step 302: Determine the current thermal management operation mode based on the external ambient temperature. The thermal management operation modes include extreme cold mode, cold mode, mild mode, and high temperature mode.

[0133] Step 303: Obtain the base water temperature range corresponding to the current thermal management operation mode.

[0134] Step 304: Within the basic water temperature range, adjust the reference water temperature value according to the current load status of the energy storage system.

[0135] Step 305: Determine the current SOC stage based on the cell's SOC value.

[0136] Step 306: Determine the current liquid cooling system water temperature threshold by combining the current SOC stage and the current cell temperature.

[0137] Step 307: Obtain the current temperature and humidity inside the battery compartment.

[0138] Step 308: Calculate the dew point temperature inside the battery compartment based on the current temperature and humidity inside the battery compartment using a preset dew point temperature calculation model.

[0139] Step 309: If the water temperature threshold of the liquid cooling system is less than or equal to the dew point temperature inside the cabin, then adjust the target dehumidification threshold to a humidity value lower than the dew point temperature inside the cabin.

[0140] Step 310: If the water temperature threshold of the liquid cooling system is greater than the dew point temperature inside the cabin, then adjust the target dehumidification threshold to a humidity value higher than the dew point temperature inside the cabin.

[0141] It should be noted that the execution order of steps 3099 and 310 is not important.

[0142] In this embodiment, the implementation method and technical effect of steps 301-310 are similar to those of the corresponding solutions in the above embodiments, and will not be repeated here.

[0143] Figure 4 This is a schematic diagram of the structure of a thermal management device for an energy storage system provided in an embodiment of this application, as shown below. Figure 4 As shown, the thermal management device of the energy storage system provided in this embodiment is located in the BAMS software control system of the energy storage system. The thermal management device 40 of the energy storage system provided in this embodiment includes: an acquisition module 41, a determination module 42, and a calculation module 43.

[0144] The acquisition module 41 is used to acquire the current external ambient temperature, load status, state of charge (SOC) of the battery cells, and battery cell temperature of the energy storage system; the determination module 42 is used to determine the current thermal management operation mode based on the external ambient temperature, including extreme cold mode, cold mode, mild mode, and high temperature mode; the determination module 42 is also used to determine the liquid cooling system water temperature threshold based on the load status, SOC, and battery cell temperature using a preset thermal management strategy under the current thermal management operation mode; the calculation module 43 is used to calculate the target dehumidification threshold based on the liquid cooling system water temperature threshold, so as to control the dehumidifier to operate according to the target dehumidification threshold.

[0145] The thermal management device of the energy storage system provided in this embodiment can perform... Figure 2 The methods provided in the embodiments are similar in their specific implementation principles and technical effects, and will not be described in detail here.

[0146] Optionally, the determining module 42, when determining the liquid cooling system water temperature threshold based on load status, SOC, and cell temperature using a preset thermal management strategy under the current thermal management operation mode, is specifically used for: obtaining the base water temperature range corresponding to the current thermal management operation mode; adjusting the reference water temperature value according to the current load status of the energy storage system within the base water temperature range; determining the current SOC stage based on the cell SOC value; and determining the current liquid cooling system water temperature threshold by combining the current SOC stage and the current cell temperature.

[0147] Optionally, the calculation module 43, in calculating the target dehumidification threshold based on the liquid cooling system water temperature threshold to control the dehumidifier to run according to the target dehumidification threshold, specifically performs the following: acquiring the current battery compartment temperature and current battery compartment humidity; calculating the compartment dew point temperature based on the current battery compartment temperature and current battery compartment humidity using a preset dew point temperature calculation model; if the liquid cooling system water temperature threshold is less than or equal to the compartment dew point temperature, adjusting the target dehumidification threshold to a humidity value lower than the compartment dew point temperature; if the liquid cooling system water temperature threshold is greater than the compartment dew point temperature, adjusting the target dehumidification threshold to a humidity value higher than the compartment dew point temperature.

[0148] Optionally, the thermal management device of the energy storage system provided in this embodiment further includes a control module.

[0149] Accordingly, the load states include charging mode, post-charging mode, discharging mode, and post-discharging mode; the control module is used to control the liquid cooling unit to start in advance when the load state is post-charging mode or post-discharging mode in high temperature mode, so as to pre-cool the cell temperature to the preset cold standby temperature range.

[0150] Optionally, the thermal management device of the energy storage system provided in this embodiment further includes an adjustment module.

[0151] Accordingly, the acquisition module 41 is also used to acquire the maximum and minimum values ​​of the cell temperature; the calculation module 43 is also used to calculate the cell temperature difference between the maximum and minimum values ​​of the cell temperature; and the adjustment module is used to adjust the flow rate of the liquid cooling system if the cell temperature difference is greater than or equal to a preset temperature difference threshold.

[0152] Optionally, the acquisition module 41 is also used to acquire the running time of the energy storage system; the adjustment module is also used to adjust the water temperature threshold of the liquid cooling system according to the preset temperature adjustment range and maintain it for the preset duration if the accumulated running time reaches the preset maintenance cycle.

[0153] Figure 5 This is a schematic diagram of the structure of a thermal management device provided in an embodiment of this application, as shown below. Figure 5 As shown, the thermal management device 50 provided in this embodiment includes a processor 51 and a memory 52 that is communicatively connected to the processor.

[0154] The memory 52 stores computer-executable instructions; the processor 51 executes the computer-executable instructions stored in the memory 52 to implement the gain control method for the receiving channel provided in the above embodiment. Related explanations can be understood by referring to the descriptions and effects corresponding to the steps in the accompanying drawings, and will not be elaborated upon here.

[0155] The program may include program code, which includes computer-executable instructions. Memory 52 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device.

[0156] In this embodiment, the processor 51 and the memory 52 are connected via a bus. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as CAN buses, address buses, data buses, control buses, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0157] This application also provides a computer-readable storage medium storing computer-executable instructions. When the controller executes the computer-executable instructions, it implements the various steps in the methods described above.

[0158] This application also provides a computer program product, including a computer program that, when executed by a controller, implements the various steps in the methods described above.

[0159] The various embodiments described above in this application can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard parts (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0160] The computer-executable instructions used to implement the methods of this application may be written in any combination of one or more programming languages. These computer-executable instructions may be provided to the processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing device, such that when executed by the processor or controller, the computer-executable instructions cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer-executable instructions may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a standalone software package, or entirely on a remote machine or electronic device.

[0161] In the context of this application, a computer-readable storage medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium can be a machine-readable signal medium or a machine-readable storage medium. A computer-readable storage medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of computer-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), optical fibers, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. Alternatively, computer-readable storage media may include: resistive random access memory (RRAM), dynamic random access memory (DRAM), static random access memory (SRAM), enhanced dynamic random access memory (EDRAM), high-bandwidth memory (HBM), hybrid memory cube (HMC), and so on.

[0162] The systems and technologies described herein can be implemented in computing systems that include back-end components (e.g., as data electronic devices), or computing systems that include middleware components (e.g., application electronic devices), or computing systems that include front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and technologies described herein), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0163] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps can be performed in other orders or simultaneously according to this application. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application. In other words, the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps disclosed in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0164] It should be further noted that although the steps in the flowchart are shown sequentially according to 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 on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0165] It should be understood that the above-described device embodiments are merely illustrative, and the device of this application can also be implemented in other ways. For example, the division of units / modules in the above embodiments is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units, modules, or components may be combined, or integrated into another system, or some features may be ignored or not executed.

[0166] Furthermore, unless otherwise specified, the functional units / modules in the various embodiments of this application can be integrated into one unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated together. The integrated units / modules described above can be implemented in hardware or as software program modules.

[0167] When an integrated unit / module is implemented in hardware, that hardware can be digital circuits, analog circuits, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc.

[0168] If the integrated unit / module is implemented as a software program module and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned memory includes various media capable of storing computer-executable instructions, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0169] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0170] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0171] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. Therefore, the specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the principles of this application should be included within the scope of protection of this application.

Claims

1. A thermal management method for an energy storage system, characterized in that, The method includes: Acquire the current ambient temperature, load status, state of charge (SOC) of the battery cells, and cell temperature of the energy storage system. The current thermal management operation mode is determined based on the external ambient temperature. The thermal management operation modes include extreme cold mode, cold mode, mild mode, and high temperature mode. In the current thermal management operation mode, a preset thermal management strategy is used to determine the water temperature threshold of the liquid cooling system based on the load status, SOC, and cell temperature. The target dehumidification threshold is calculated based on the water temperature threshold of the liquid cooling system, so as to control the dehumidifier to operate according to the target dehumidification threshold.

2. The method according to claim 1, characterized in that, The step of determining the liquid cooling system water temperature threshold based on load status, SOC, and cell temperature using a preset thermal management strategy under the current thermal management operating mode includes: Obtain the base water temperature range corresponding to the current thermal management operation mode; Within the basic water temperature range, the reference water temperature value is adjusted according to the current load status of the energy storage system; Determine the current SOC stage based on the cell's SOC value; The current liquid cooling system water temperature threshold is determined by combining the current SOC stage and the current cell temperature.

3. The method according to claim 1, characterized in that, The step of calculating the target dehumidification threshold based on the water temperature threshold of the liquid cooling system, and controlling the dehumidifier to operate according to the target dehumidification threshold, includes: Get the current temperature and humidity inside the battery compartment; The dew point temperature inside the battery compartment is calculated based on the current temperature and humidity inside the battery compartment using a preset dew point temperature calculation model. If the water temperature threshold of the liquid cooling system is less than or equal to the dew point temperature inside the cabin, the target dehumidification threshold will be adjusted to a humidity value lower than the dew point temperature inside the cabin. If the water temperature threshold of the liquid cooling system is greater than the dew point temperature inside the cabin, the target dehumidification threshold will be adjusted to a humidity value higher than the dew point temperature inside the cabin.

4. The method according to claim 1, characterized in that, The load state includes charging mode, post-charging mode, discharging mode, and post-discharging mode; the method further includes: In high-temperature mode, when the load status is post-charge or post-discharge mode, the liquid cooling unit is turned on in advance to pre-cool the cell temperature to the preset cold standby temperature range.

5. The method according to claim 1, characterized in that, Also includes: Obtain the maximum and minimum values ​​of the cell temperature; Calculate the temperature difference between the maximum and minimum cell temperatures; If the temperature difference of the battery cell is greater than or equal to the preset temperature difference threshold, the flow rate of the liquid cooling system is adjusted.

6. The method according to claim 1, characterized in that, Also includes: Obtain the runtime of the energy storage system; If the accumulated runtime reaches the preset maintenance cycle, the liquid cooling system water temperature threshold is increased according to the preset temperature adjustment range and maintained for the preset duration.

7. A thermal management device for an energy storage system, characterized in that, The device is located in the BAMS software control system of the energy storage system, and the device includes: The acquisition module is used to acquire the current external ambient temperature, load status, cell charge status (SOC), and cell temperature of the energy storage system. The determination module is used to determine the current thermal management operation mode based on the external ambient temperature. The thermal management operation mode includes extreme cold mode, cold mode, mild mode and high temperature mode. The determining module is also used to determine the water temperature threshold of the liquid cooling system based on the load state, SOC and cell temperature using a preset thermal management strategy under the current thermal management operation mode. The calculation module is used to calculate the target dehumidification threshold based on the water temperature threshold of the liquid cooling system, so as to control the dehumidifier to operate according to the target dehumidification threshold.

8. A thermal management device, characterized in that, The device includes: a processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method described in any one of claims 1 to 6.

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