CN-122025917-A - Energy-saving adjusting method, device and equipment for energy storage box responding to running state

CN122025917ACN 122025917 ACN122025917 ACN 122025917ACN-122025917-A

Abstract

The invention relates to the technical field of thermal management of energy storage systems, in particular to an energy storage box energy-saving adjusting method, device and equipment for responding to an operating state. The technical problem that the thermal management response accuracy is low under the dynamic working condition by taking temperature as the sole decision basis in the prior art is solved. The method comprises the steps of obtaining real-time operation parameters of an energy storage box, determining a fluid transportation time window based on a cooling liquid flow rate, determining a fluid transportation domain heat load characteristic value based on historical battery current in the fluid transportation time window, determining a compressor starting inhibition ratio based on the heat load characteristic value, the cooling liquid flow rate, the battery temperature and the environment temperature, and indicating the compressor to switch the working mode based on a comparison result of the compressor starting inhibition ratio and a preset threshold. The invention is used for the thermal management scene of the energy storage box.

Inventors

JI HUI
MIAO JIE
PANG SHENG

Assignees

江苏亿都智能特种装备有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A method of energy conservation regulation of an energy storage tank responsive to an operating condition, the method comprising: acquiring real-time operation parameters of the energy storage box, wherein the operation parameters comprise battery current, cooling liquid flow rate, battery temperature and ambient temperature; determining a fluid transport time window based on the coolant flow rate; determining a fluid transport domain thermal load characteristic value based on historical battery current within the fluid transport time window, the thermal load characteristic value being used to characterize an accumulated thermal load that will reach a heat exchange interface within the fluid transport time window; determining a compressor start-up inhibition ratio based on the thermal load characteristic value, the coolant flow rate, the battery temperature and the ambient temperature, wherein the compressor start-up inhibition ratio is used for quantifying the unreasonable degree of starting up the compressor for refrigeration at the current moment; and indicating the compressor to switch the working mode based on a comparison result of the compressor starting inhibition ratio and a preset threshold.
2. The energy storage tank economizer condition adjustment method in response to an operating condition of claim 1 wherein said determining a compressor start-up rejection ratio based on said thermal load characteristic value, said coolant flow rate, said battery temperature, and said ambient temperature comprises: Determining a compressor energy consumption cost factor based on the heat load characteristic value and the environment temperature, wherein the energy consumption cost factor is used for representing the degree of deviation of refrigeration from an optimal energy efficiency point under the current working condition; Determining a heat exchange condition non-ready factor based on the battery current and the cooling liquid flow rate, wherein the heat exchange condition non-ready factor is used for representing the degree that heat reaches a heat exchange interface but the flow rate is insufficient to cause ineffective refrigeration; Determining a battery temperature rise imminence weight based on the battery temperature, wherein the temperature rise imminence weight characterizes the urgency degree of the battery temperature approaching a safety threshold; and determining the compressor start inhibition ratio based on the energy consumption cost factor, the heat exchange condition unaddressed factor and the battery temperature rise imminence weight.
3. The method of claim 2, wherein said determining a compressor energy consumption cost factor based on said thermal load characteristic value and said ambient temperature comprises: determining a target refrigeration reference power based on the thermal load characteristic value and the fluid transport time window; Determining an energy efficiency ratio and an optimal energy efficiency working point under the current working condition based on the environment temperature, the target refrigeration reference power and a compressor performance map; And determining the energy consumption cost factor based on the ratio of the energy efficiency ratio under the current working condition to the highest energy efficiency ratio corresponding to the environment temperature in the performance map of the compressor.
4. The method of claim 2, wherein said determining a heat transfer condition unaddressed factor based on said battery current and said coolant flow rate comprises: Determining heat flux reaching a heat exchange interface through a first-order inertia link based on the battery current and the battery internal resistance, wherein the time constant of the first-order inertia link is calibrated according to the heat conduction characteristic of the battery; determining a flow rate duty cycle based on the difference of the coolant flow rate and a nominal flow rate; The heat exchange condition unaddressed factor is determined based on the heat flux and the flow rate duty cycle.
5. The method of claim 2, wherein determining a battery temperature rise imminent weight based on the battery temperature comprises: The battery temperature rise imminence weight is determined based on the battery temperature, a preset high temperature alarm threshold, a preset transition temperature width, and a nonlinear function configured such that the weight approaches zero the closer the battery temperature is to the high temperature alarm threshold.
6. The energy storage tank energy conservation adjustment method responsive to an operational state of claim 1, further comprising: judging whether the flow rate of the cooling liquid is lower than a preset minimum effective flow rate or not; and taking the minimum effective flow rate as the cooling liquid flow rate to determine the fluid transportation time window under the condition that the cooling liquid flow rate is lower than a preset minimum effective flow rate.
7. The energy storage tank energy conservation adjustment method responsive to operating conditions of claim 1, wherein the determining a fluid transport domain thermal load characteristic value based on historical battery current within the fluid transport time window comprises: and accumulating the product of the square value of the historical battery current and the internal resistance of the battery in the fluid transportation time window to determine the thermal load characteristic value of the fluid transportation domain.
8. The method of claim 1, wherein the indicating the compressor to switch the operation mode based on a comparison of the compressor start-up rejection ratio to a preset threshold comprises: Comparing the compressor start-up inhibition ratio with a preset first threshold and a second threshold, wherein the first threshold is smaller than the second threshold; When the compressor start-up rejection ratio is less than the first threshold, indicating that the compressor enters an active refrigeration mode; when the compressor starting inhibition ratio is larger than the second threshold, the compressor is instructed to enter a passive heat absorption mode, in the passive heat absorption mode, the compressor is stopped, and the coolant pump is operated at the lowest maintenance flow rate; and when the compressor starting inhibition ratio is greater than or equal to the first threshold and less than or equal to the second threshold, maintaining the working mode at the last moment.
9. Energy-saving adjusting device of energy storage box of response running state, its characterized in that, energy-saving adjusting device of energy storage box of response running state includes: The system comprises a parameter acquisition module, a control module and a control module, wherein the parameter acquisition module is used for acquiring real-time operation parameters of the energy storage box, wherein the operation parameters comprise battery current, cooling liquid flow rate, battery temperature and environmental temperature; A time window determination module for determining a fluid transport time window based on the coolant flow rate; A thermal load characteristic determination module for determining a fluid transport domain thermal load characteristic value based on historical battery current within the fluid transport time window, the thermal load characteristic value being used to characterize an accumulated thermal load that will reach a heat exchange interface within the fluid transport time window; the starting inhibition ratio determining module is used for determining a compressor starting inhibition ratio based on the heat load characteristic value, the cooling liquid flow rate, the battery temperature and the environment temperature, wherein the compressor starting inhibition ratio is used for quantifying the unreasonable degree of starting the compressor for refrigeration at the current moment; And the mode switching module is used for indicating the compressor to switch the working mode based on the comparison result of the compressor starting inhibition ratio and a preset threshold.
10. The energy storage tank energy-saving adjusting device responding to the operation state is characterized by comprising a memory, a processor and a computer program which is stored on the memory and can run on the processor; The processor is configured to execute the computer program to implement the energy storage tank energy saving adjustment method according to any one of claims 1 to 8 in response to an operation state.

Description

Energy-saving adjusting method, device and equipment for energy storage box responding to running state Technical Field The invention relates to the technical field of thermal management of energy storage systems, in particular to an energy storage box energy-saving adjusting method, device and equipment for responding to an operating state. Background The liquid cooling energy storage system is widely applied to auxiliary service scenes such as power grid frequency modulation, and the like, and under the working conditions, the battery load shows a severe and random fluctuation characteristic, so that the heat generation rate of the battery core is changed rapidly. After heat is generated from the inside of the battery core, the heat is required to be transmitted to the surface of the liquid cooling plate and then carried by cooling liquid to be discharged, and the whole physical transmission process has obvious time delay. To maintain the battery operating in a suitable temperature range, the energy storage system is typically equipped with a compressor-based liquid-cooled thermal management unit for cooling the battery pack. The existing energy storage box thermal management strategy generally adopts a feedback control mode based on battery temperature, namely, the battery temperature is collected in real time and compared with a set threshold value, and the refrigerating output is controlled by starting and stopping the compressor or adjusting the operation frequency of the compressor. The control mode takes the temperature as a unique decision basis, under the dynamic working condition of severe load fluctuation, the response delay of the temperature change relative to the heat production rate in minute level exists, so that time mismatch exists between the refrigeration action and the real heat load demand, the frequent start and stop of the compressor or the long-time deviation from the high-efficiency operation interval is easily caused, and the thermal management response accuracy of the temperature as the unique decision basis under the dynamic working condition is lower. Disclosure of Invention In order to solve the technical problem that the temperature is taken as the sole decision basis in the prior art, and the thermal management response accuracy is low under the dynamic working condition, the invention aims to provide an energy-saving adjusting method, an energy-saving adjusting device and energy-saving adjusting equipment for an energy storage box in response to an operating state, and the adopted technical scheme is as follows: In a first aspect, the invention provides an energy-saving regulation method of an energy storage tank in response to an operation state, the method comprises the steps of obtaining real-time operation parameters of the energy storage tank, wherein the operation parameters comprise battery current, cooling liquid flow rate, battery temperature and environment temperature, determining a fluid transportation time window based on the cooling liquid flow rate, determining a fluid transportation domain heat load characteristic value based on historical battery current in the fluid transportation time window, wherein the heat load characteristic value is used for representing accumulated heat load reaching a heat exchange interface in the fluid transportation time window, determining a compressor starting inhibition ratio based on the heat load characteristic value, the cooling liquid flow rate, the battery temperature and the environment temperature, quantifying unreasonable degree of starting compressor refrigeration at the current moment, and indicating the compressor to switch an operation mode based on comparison results of the compressor starting inhibition ratio and a preset threshold. With reference to the first aspect, in one possible implementation manner, the method specifically includes determining a compressor energy consumption cost factor based on a heat load characteristic value and an ambient temperature, wherein the energy consumption cost factor is used for representing a degree of deviation of refrigeration from an optimal energy efficiency point under a current working condition, determining a heat exchange condition non-ready factor based on a battery current and a cooling liquid flow rate, determining a degree of ineffective refrigeration caused by insufficient flow rate when heat reaches a heat exchange interface, determining a battery temperature rise impending degree weight based on the battery temperature, determining a degree of urgency of the battery temperature approaching a safety threshold by the temperature rise impending degree weight, and determining a compressor starting inhibition ratio based on the energy consumption cost factor, the heat exchange condition non-ready factor and the battery temperature rise impending degree weight. With reference to the first aspect, in one possible implementation manner, the method specifically inclu