A battery SOC estimation method
A SOCB and battery technology, applied in the field of battery energy management, can solve problems such as data saturation, forgetting factor cannot be optimized, and large fluctuations in estimation errors, so as to avoid saturation and improve the accuracy of SOC real-time estimation
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Embodiment 1
[0031] like figure 1 As shown, this embodiment provides a battery SOC estimation method, and the method is applied to the SOC estimation of a ternary battery, including the following steps:
[0032] A. Obtain the current SOC value of the battery through the battery management system (BMS) BMS , according to SOCBMS Determine the exit condition for recursive least squares. The battery management system updates the battery SOC value in real time. When using this method to estimate the SOC, first obtain the SOC value SOC estimated by the battery management system BMS , and according to SOC BMS to determine the exit condition of the recursive least squares method in this method;
[0033] B. Use the ampere-hour integral algorithm to continuously estimate the real-time SOC value of the battery from the beginning of the estimation procedure;
[0034] The exit condition is: in the recursive process of the recursive least squares method, the cumulative change of SOC recorded by the ...
Embodiment 2
[0050] The difference between this embodiment and the first embodiment is that:
[0051] The exit condition of the recursive least squares method is: the cumulative change of SOC recorded by the ampere-hour integration algorithm ≥ΔErr*dSOC BMS / dOCV BMS And when the number of recurrences N is more than 60 times, or when the number of recurrences has exceeded 300 times, the recurrence is stopped;
[0052] When performing step D, when the SOC variation of the battery is greater than 5%, the recursive least squares method is used to calculate the battery at t B SOC value at time SOC B ;
[0053] in determining SOC B effectiveness when the SOC B Compliant with the SOC B The correlation between OCV value and SOC value at dSOC B / dOCV B B -SOC A -ΔSOC|≤0.5%, the SOC is determined B Valid; when abs|SOC B -SOC A -ΔSOC|≤0.5% and dSOC B / dOCV B When ≥0.05% / mV, it is judged that SOCB is invalid; when abs|SOC appears B -SOC A When -ΔSOC|>0.5%, continue to repeat steps A-D....
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