CN-122025929-A - Thermal management method, device and system for energy storage system, energy storage device and power utilization device

Abstract

The invention relates to the technical field of energy storage, and provides a thermal management method, a device and a system of an energy storage system, and an energy storage and electricity utilization device. The invention is applied to a thermal management system, which comprises a plurality of parallel branches, a flow resistance adjusting device and a flow detection assembly, wherein the flow resistance adjusting device and the flow detection assembly are respectively arranged on each branch; the method comprises the steps of obtaining actual flow of a target branch through a flow detection assembly, determining flow deviation of the actual flow and the target flow, and controlling a flow resistance adjusting device corresponding to the target branch according to the flow deviation to adjust flow resistance of the target branch. The problem of uneven coolant flow distribution among a plurality of parallel branches in the immersed cooling system is solved.

Inventors

• SUN WEI
• SHI YANYAN
• ZHANG LUHUA

Assignees

• 浙江晶科储能有限公司

Dates

Publication Date

20260512

Application Date

20260408

Claims (18)

1. 1. The thermal management method of the energy storage system is characterized by being applied to the thermal management system, wherein the thermal management system comprises a plurality of branches connected in parallel, a flow resistance adjusting device and a flow detection assembly which are respectively arranged on the branches, and a temperature detection assembly and a pressure detection assembly which are respectively arranged on the branches, wherein a temperature index calibration curve family corresponding to each branch is stored in the thermal management system, and the method comprises the following steps: Acquiring the actual flow of the target branch through the flow detection assembly; Determining the flow deviation of the actual flow and the target flow; Controlling the flow resistance adjusting device corresponding to the target branch according to the flow deviation to adjust the flow resistance of the target branch; the method further comprises the steps of: acquiring the actual temperature of the target branch through the temperature detection assembly, and acquiring the actual inlet-outlet pressure difference of the target branch through the pressure detection assembly; Determining a calibration reference pressure difference according to the actual flow and a target calibration curve, wherein the target calibration curve is obtained based on the temperature index calibration curve family corresponding to the target branch and the actual temperature; and controlling the flow resistance regulating device corresponding to the target branch according to the difference value under the condition that the difference value between the actual inlet and outlet pressure difference and the calibration reference pressure difference is larger than a preset deviation zone, and regulating the flow resistance of the target branch.
2. 2. The method of thermal management of an energy storage system of claim 1, wherein the method comprises: And under the condition that the absolute value of the flow deviation is larger than a first flow deviation threshold value, executing the step of adjusting the flow resistance of the target branch, and returning to the step of acquiring the actual flow of the target branch after a preset time interval is reached until the absolute value of the flow deviation is smaller than or equal to the first flow deviation threshold value.
3. 3. The method of claim 1, further comprising a temperature sensing assembly disposed on each of the branches, wherein the controlling the flow resistance adjustment device corresponding to the target branch according to the flow deviation adjusts the flow resistance of the target branch, and comprises: acquiring the actual temperature of the target branch through the temperature detection assembly; and controlling the flow resistance regulating device corresponding to the target branch circuit to reduce the flow resistance of the target branch circuit under the condition that the actual flow is smaller than the target flow and the actual temperature is larger than or equal to a first temperature threshold value.
4. 4. A method of thermal management of an energy storage system according to claim 3, wherein the flow resistance adjustment means reduces the magnitude of the flow resistance of the target leg in positive correlation with the difference in the actual temperature from the first temperature threshold.
5. 5. The method of thermal management of an energy storage system of claim 1, further comprising: acquiring actual inlet and outlet pressure differences, actual flow and actual temperature of a plurality of branches; respectively determining standardized deviation values of the actual inlet and outlet differential pressures of the branches relative to corresponding calibration reference differential pressures; determining the mean and standard deviation of the normalized deviation values of a plurality of the branches; and under the condition that the standard deviation is larger than a standard deviation threshold value, determining a target abnormal branch with the largest absolute value corresponding to the standardized deviation value in the plurality of branches, and increasing the adjustment amplitude of the flow resistance adjusting device corresponding to the target abnormal branch.
6. 6. The method of thermal management of an energy storage system of claim 1, further comprising: Fitting according to steady-state operation data of each branch in a preset updating period to obtain a current flow resistance coefficient of each branch; determining the relative rate of change of the current flow resistance coefficient of each branch relative to an initial flow resistance coefficient; determining an average rate of change and a standard deviation of the rates of change of the relative rates of change of a plurality of the branches; And under the condition that the average change rate is larger than a first change rate threshold and the change rate standard deviation is smaller than a second change rate threshold, carrying out integral offset correction on the temperature index calibration curve family corresponding to each branch according to the average change rate.
7. 7. The method of thermal management of an energy storage system of any of claims 1-4, wherein prior to determining the flow deviation of the actual flow from a target flow, further comprising: Acquiring state information of a target battery device corresponding to the target branch, and a power scheduling plan in a future preset time window; Predicting a predicted heating power of the target battery device according to the state information and the power scheduling plan; Determining the target flow of the target branch according to the predicted heating power; And before the power scheduling plan is executed, controlling the flow resistance regulating device to regulate the flow resistance of the target branch in advance for a preset time period.
8. 8. The method of claim 7, wherein predicting the predicted heating power of the target battery device based on the status information and the power schedule plan comprises: extracting real-time voltage and internal resistance estimated values of the target battery device from the state information; determining a predicted current according to the power scheduling plan and the real-time voltage; and determining the predicted heating power according to the product of the square value of the predicted current and the internal resistance estimated value.
9. 9. The method of claim 1, further comprising a circulation pump disposed on the main circuit and a temperature detection assembly disposed on each of the branches, wherein prior to obtaining the actual flow of the target branch, further comprising: Acquiring the actual temperature of the target branch; And setting the flow resistance of the flow resistance adjusting device to be a minimum preset flow resistance and controlling the circulating pump to operate at a first rotation speed under the condition that the actual temperature is smaller than a second temperature threshold.
10. 10. The method of thermal management of an energy storage system of claim 9, further comprising: Increasing the rotating speed of the circulating pump according to a preset speed under the condition that the actual temperature is greater than or equal to a third temperature threshold value, wherein the third temperature threshold value is greater than the second temperature threshold value; And under the condition that the rotating speed of the circulating pump reaches a second rotating speed, executing the step of determining the flow deviation between the actual flow and the target flow and the subsequent step, and adopting a first control parameter set to control the flow resistance regulating device, wherein the second rotating speed is larger than the first rotating speed and smaller than the rated rotating speed of the circulating pump.
11. 11. The method of thermal management of an energy storage system of claim 10, further comprising: when the actual temperature is greater than or equal to a fourth temperature threshold, the rotating speed of the circulating pump reaches the rated rotating speed, and the absolute value of the flow deviation is smaller than or equal to a second flow deviation threshold, switching the first control parameter set into a second control parameter set to control the flow resistance adjusting device, wherein the fourth temperature threshold is greater than the third temperature threshold; wherein the integration time constant of the first control parameter set is greater than the integration time constant of the second control parameter set.
12. 12. A thermal management device for an energy storage system, comprising: the flow acquisition module is configured to acquire the actual flow of the target branch through the flow detection assembly; The deviation determining module is configured to determine a flow deviation between the actual flow and a target flow; a flow resistance adjusting module configured to control a flow resistance adjusting device corresponding to the target branch according to the flow deviation, and adjust the flow resistance of the target branch; The calibration curve management module is configured to store a temperature index calibration curve family corresponding to each branch, determine a target calibration curve matched with the actual temperature from the temperature index calibration curve family according to the actual temperature of the target branch acquired by the temperature detection assembly, and determine a calibration reference pressure difference according to the actual flow and the target calibration curve; The deviation detection module is configured to trigger the flow resistance adjustment module to adjust the flow resistance of the target branch according to the difference value when the difference value between the actual inlet and outlet pressure differences of the target branch obtained through the pressure detection assembly and the calibration reference pressure difference is larger than a preset deviation zone.
13. 13. The thermal management device of an energy storage system of claim 12, further comprising: the temperature state judging module is configured to acquire the actual temperature of the target branch through the temperature detecting component, and trigger the flow resistance adjusting module to reduce the flow resistance of the target branch under the condition that the actual flow is smaller than the target flow and the actual temperature is larger than or equal to a first temperature threshold.
14. 14. The thermal management device of an energy storage system of claim 12 or 13, further comprising: The prospective control module is configured to acquire state information of a target battery device corresponding to the target branch and a power scheduling plan in a future preset time window, predict predicted heating power of the target battery device according to the state information and the power scheduling plan, determine the target flow of the target branch according to the predicted heating power, and trigger the flow resistance adjusting module to adjust the flow resistance of the target branch in advance of the execution of the power scheduling plan for a preset time.
15. 15. The thermal management device of an energy storage system of claim 12 or 13, further comprising: the cold start control module is configured to acquire the actual temperature of the target branch, set the flow resistance of the flow resistance adjusting device to be minimum preset flow resistance under the condition that the actual temperature is smaller than a second temperature threshold value, and control the circulating pump to operate at a first rotation speed.
16. 16. A thermal management system for an energy storage system, comprising: A main road; A plurality of branches, each branch being in fluid communication with the main circuit and each branch being disposed in parallel, each branch comprising a submerged cavity, a flow resistance adjustment device, and a flow detection assembly disposed on the branch, and A controller in communication with the flow resistance adjustment device and the flow detection assembly, respectively, on each of the branches, the controller configured to perform the method of thermal management of the energy storage system of any one of claims 1 to 11.
17. 17. An energy storage device, comprising: battery device, and The thermal management system of an energy storage system of claim 16, the battery device disposed within the submerged cavity of the thermal management system.
18. 18. An electrical device, comprising: battery device, and The thermal management system of an energy storage system of claim 16, the battery device disposed within the submerged cavity of the thermal management system.

Description

Thermal management method, device and system for energy storage system, energy storage device and power utilization device Technical Field The invention relates to the technical field of energy storage, in particular to a thermal management method, a device and a system of an energy storage system, and an energy storage and electricity utilization device. Background With the rapid development of energy storage technology, the submerged cooling technology is gradually applied to the field of thermal management of energy storage systems due to the characteristics of high heat dissipation efficiency, good temperature uniformity and the like. In an immersion cooling system, a plurality of parallel branches are generally used to respectively convey cooling liquid to each immersion cavity, so as to realize synchronous heat dissipation of a plurality of battery devices. However, in actual operation, there is often a problem of uneven coolant flow distribution among the multiple parallel branches, resulting in inconsistent heat dissipation effects of the battery devices in part of the cavities, and thus affecting the overall temperature uniformity of the energy storage system. Disclosure of Invention The invention aims to provide a heat management method, a heat management device, a heat management system and an energy storage and power utilization device of an energy storage system, so as to solve the problem of uneven distribution of coolant flow among a plurality of parallel branches in an immersed cooling system. In order to solve the technical problems, the invention provides a thermal management method of an energy storage system, which is applied to a thermal management system, wherein the thermal management system comprises a plurality of branches connected in parallel, and flow resistance adjusting devices and flow detection assemblies respectively arranged on the branches. The invention further provides a thermal management device of the energy storage system, which comprises a flow acquisition module, a deviation determination module and a flow resistance adjustment module, wherein the flow acquisition module is configured to acquire the actual flow of the target branch through the flow detection assembly, the deviation determination module is configured to determine the flow deviation between the actual flow and the target flow, and the flow resistance adjustment module is configured to control the flow resistance adjustment device corresponding to the target branch according to the flow deviation and adjust the flow resistance of the target branch. The invention further provides a thermal management system of the energy storage system, which comprises a main path, a plurality of branches, wherein each branch is in fluid communication with the main path and is arranged in parallel, each branch comprises a submerged cavity, a flow resistance adjusting device and a flow detection assembly, the flow resistance adjusting device and the flow detection assembly are arranged on the branches, the controller is respectively in communication connection with the flow resistance adjusting device and the flow detection assembly on each branch, and the controller is configured to execute the thermal management method of the energy storage system. The invention also provides an energy storage device, which comprises a battery device and the thermal management system of the energy storage system, wherein the battery device is arranged in a submerged cavity of the thermal management system. The invention also provides an electric device, which comprises a battery device and the heat management system of the energy storage system, wherein the battery device is arranged in a submerged cavity of the heat management system. The technical scheme provided by the invention has the following technical effects that the flow detection assembly and the flow resistance adjusting device are respectively arranged on each branch, and the flow resistance of each branch is independently and dynamically adjusted in a closed loop based on the deviation between the actually measured flow and the target flow of each branch, so that the flow rates of the cooling liquid of all parallel branches tend to be distributed uniformly. Compared with the mode of statically setting the opening of the valve or adjusting according to the temperature signal, the scheme can compensate the flow deviation caused by the physical difference of the pipelines in real time, so that the flow of the cooling liquid obtained by each immersed cavity is matched with the heat dissipation requirement of the cooling liquid, and the temperature consistency in the energy storage system is improved. Drawings One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, which are not to be construed as limiting the embodiments unless specifically claimed, and in order to more clearly illustrate the embodiments of the