Sliding Mode Observer for State of Charge Estimation Based on Battery Equivalent Circuit in Electric Vehicles

Abstract The sliding mode observer (SMO) for battery state of charge (SOC) estimation based on the improved battery equivalent circuit is presented. The convergence of the SMO is proved by Lyapunov stability theory. The advantage of the SMO is that the modelling errors caused by the variation parameters of circuit model can be compensated. Three sets of the testing data under different discharge current profiles generated by DUALFOIL battery simulation program are used to extract the circuit model parameters and to verify the effectiveness of the proposed SMO for the SOC estimation. It shows that the proposed SOC observer can provide robust tracking performance and accurate SOC estimation in electric vehicle driving conditions.

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