Impedance-based simulation models of supercapacitors and Li-ion batteries for power electronic applications

To predict performance of modern power electronic systems, simulation-based design methods are used. This work employs the method of electrochemical impedance spectroscopy to find new equivalent-circuit models for supercapacitors and Lithium-ion batteries.

I. Introduction

Simulation-Based development methods are increasingly employed to cope with the complexity of modern power electronic systems. For these methods, suitable submodels of all system components are mandatory. However, compared to the submodels of most electric and electronic components, accurate dynamic models of electrochemical energy storage devices are rare. Therefore, this paper employs the method of electrochemical impedance spectroscopy (EIS) to extent the physics-based, nonlinear equivalent circuit models of supercapacitors (SCs) [2] to describe Lithium-ion (Li-ion) batteries.