The thesis deals with the development and optimization of an equivalent circuit model for electrochemical impedance spectroscopy (EIS) analysis of lithium-ion batteries. The results of the EIS method are first described with an equivalent circuit model, which consists of the Randles model with extensions. The main problem is the determination of model parameters from measured data. In the second part of the thesis, a numerical procedure for automatic adaptation of the equivalent circuit model using optimization algorithms will be developed. The result of the thesis will be a computer tool for processing EIS data, which allows the determination of physically relevant parameters.
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