Abstract
This paper presents a hybrid method for estimating state of charge of Li-ion batteries from frequency domain input-output data using electrochemical impedance spectroscopy (EIS). The hybrid method combines impedance modeling and a fuzzy-logic estimator. Based on an equivalent electrical circuit, a fractional impedance model is identified by minimizing a quadratic norm of the output error. Then, a fuzzy logic estimator is developed on the basis of the estimated parameters.
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