Abstract：In order to improve the estimation accuracy of lithium battery SOC, based on adaptive H∞ observer a joint estimation method of lithium battery SOC and capacity is proposed. Based on the second-order RC equivalent circuit model of lithium battery, and the coupling relationship between SOC and capacity is considered, the capacity of lithium battery is also observed as the state variable of the system. An adaptive H∞ observer is designed. The parameters of the observer can be adjusted adaptively with the state change of lithium battery. Since the influence of capacity is considered in SOC estimation, the adaptive H∞ observer can realize the simultaneous accurate estimation of SOC and capacity. The experimental results show that the adaptive H∞ observer has high estimation accuracy and strong robustness. The average SOC estimation error of the battery is always within 0.43%. Compared with EKF and H∞ observers, the adaptive H∞ observer has higher estimation accuracy and stability.
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2024, Vol. 45 
