Battery SOC estimation method
A SOCB and battery technology, applied in the field of battery energy management, can solve problems such as unoptimized forgetting factors, data saturation, and large fluctuations in estimation errors, so as to improve the accuracy of SOC real-time estimation and avoid recursive data saturation.
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Embodiment 1
[0031] Such as figure 1 As shown, this embodiment provides a method for estimating the SOC of a battery. Applying this method to the SOC estimation of a ternary battery includes the following steps:
[0032] A. Obtain the current SOC value SOC of the battery through the battery management system (BMS) BMS , according to SOCBMS Determines the exit criteria for the recursive least squares method. 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 estimated by the battery management system SOC BMS , and according to the SOC BMS To determine the exit condition of the recursive least squares method in this method;
[0033] B. Use the ampere-hour integration algorithm to continuously estimate the real-time SOC value of the battery from the estimation program;
[0034] The exit condition is: in the recursive process of the recursive least squares method, the cumulative change in SOC reco...
Embodiment 2
[0050] The difference between this embodiment and Embodiment 1 is:
[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 recursions N is more than 60 times, or when the number of recursions is more than 300 times, stop the recursion;
[0052] When executing step D, when the SOC variation of the battery is greater than 5%, the recursive least square method is used to calculate the battery at t B SOC value at time SOC B ;
[0053] In judging SOC B validity, when the SOC B complies with the SOC in the B The correlation between the change of OCV value and SOC value at dSOC B / dOCV B B -SOC A When -ΔSOC|≤0.5% is the condition, the SOC is judged 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 ste...
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