Abstract
In this paper, the state of charge (SOC) estimation for lithium-ion (Li-ion) battery is considered. In order to reduce the SOC estimation error caused by temperature effect, a temperature-compensated method is proposed. The temperature-compensated method is based on the ohmic resistance of the equivalent circuit model (ECM) of the Li-ion battery. According to the ohmic resistance, a proper temperature model can be chosen. The adaptive extended Kalman filter (AEKF) is then applied to estimate the SOC of Li-ion battery based on the chosen temperature model. Experimental results show that the proposed temperature-compensated SOC estimation method performs better estimation accuracy than that method without temperature-compensated.
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