Analyzing Electrical Equivalent Circuit Models for Solid-State Batteries: Parameterization and Modeling

Solid-state battery (SSB) technology has emerged as a breakthrough technology in energy storage, primarily advancing the electric vehicles (EV) industry and contributing to sustainability goals. SSB offers great advantages over Li-ion batteries, such as high energy density, enhanced safety, extended mileage, and low degradation. This paper focuses on modeling SSB through an electrical equivalent circuit (EEC) and broadly investigates its parameterization and degradation behaviors. Battery parameters are derived from electrochemical impedance spectroscopy (EIS) data to model the SSB. The cell level of the SSB is simulated using different driving patterns. To extend the study, degradation analysis is performed, and it reveals that the SSB demonstrates minimal degradation even after 200 cycles at a high charging rate. The capacity loss measured about 0.16% of the total capacity and retains an impressive 99.84% of its original capacity, and the internal resistance rise remains within the milli ohms range.