Energy storage battery state evaluation method and device, electronic equipment and storage system
An energy storage battery and state evaluation technology, which is applied in measurement devices, measurement of electricity, measurement of electric variables, etc., can solve the problems of high cost, low accuracy, long time consumption, etc., and achieve high accuracy, high universality, real-time strong effect
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[0132] In the actual operation, the working state and the shelving state of the battery alternately exist, and there are more and longer shelving processes under the energy storage condition. However, the existing evaluation methods usually ignore the loss of the battery during shelving. Considering that the battery has different decay mechanisms when it is working and standing still, the present invention establishes battery state evaluation methods under the two decay mechanisms respectively, by judging, extracting, and calculating the time, temperature, voltage, and current parameters of the power station data in the two states Data, combined with two methods to evaluate the state of the battery, and establish a weighted coupling mechanism for the battery state with temperature parameters at different times, which is more in line with the actual characteristics of the battery and improves the accuracy of the evaluation.
[0133] According to the data type and granularity of ...
Embodiment 1
[0135] see figure 1 As shown, under the condition that the historical data of the battery is clear and complete, an energy storage battery state evaluation method of the present invention includes the following steps:
[0136]S1. Obtain the historical data of the energy storage battery, and extract the working parameters of the battery in the historical data: current, voltage, time (running time and shelf time) and temperature;
[0137] S2. Obtain the accumulative energy loss △Q of battery operation through the established coupling relationship;
[0138]
[0139] △t is the time interval for selecting the operation data; the historical data of the energy storage power station is usually uploaded every 1 minute or a few seconds, and this △t is the upload data interval. The granularity of historical data is different, and Δt is also different. In the uploaded data, if the current is 0, it can be judged that the battery is on hold within this △t time, and if the current is no...
Embodiment 2
[0159] The second is to first calibrate the current state of the battery to obtain the calibrated state of health SOH1 when the historical data of the battery is missing and the granularity is low, and then give a specific operation and maintenance strategy based on the final calculated specific SOH.
[0160] The conventional method of calibrating SOH is to fully charge and discharge to obtain the current capacity, which is divided by the factory capacity of the battery to obtain SOH. The calibration method of this embodiment may adopt a conventional method or a quick impedance test method; firstly, the current SOH is calibrated, and then the subsequent SOH changes are obtained in real time through the above method.
[0161] see figure 2 As shown, embodiment 2 is a method for evaluating the state of an energy storage battery, comprising the following steps:
[0162] S0. Calibrate the state of health of the energy storage battery to obtain the calibrated state of health SOH1;...
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