Abstract
The evolution in battery technology is the key to developing the most efficient Electric Vehicles and winning the challenge for the future E-mobility. As it is difficult to describe battery behavior, we seek in this study to determine an accurate circuit model of the battery that can be used in simulation software. Different tests were performed on Panasonic model NCR18650B lithium batteries in order to find an accurate model that characterizes their behavior in four essential criteria: state of charge, internal resistance, differential capacitance and efficiency. The novelty of this work is the implementation of a technical approach that considers DC and AC model characteristics with their respective experimental approaches, which leads to achieving reliable model performance in both stationary and transient load conditions. The validation of this model using the results from constant current experiments was performed by impedance spectroscopy. It enables the validation of equivalent circuit models for the battery that reproduce faithfully its dynamic response at one particular state of charge.
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