Lithium‑ion battery modeling using CC–CV and impedance spectroscopy characterizations

摘要

The evolution in battery technology is the key to developing the most efficient Electric Vehicles and winning the challengefor the future E-mobility. As it is difficult to describe battery behavior, we seek in this study to determine an accuratecircuit model of the battery that can be used in simulation software. Different tests were performed on Panasonic modelNCR18650B 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 implementationof 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 ofthis model using the results from constant current experiments was performed by impedance spectroscopy. It enablesthe validation of equivalent circuit models for the battery that reproduce faithfully its dynamic response at one particularstate of charge.