Online Impedance Based Hardware-in-the-Loop Testbed for Battery Management Systems

Abstract

This paper presents a hardware-in-the-loop (HIL) testing platform for the real-time validation of an impedance-based battery management system (BMS). The battery model inside the HIL platform updates in real-time with respect to charge and discharge cycles to give an accurate representation of the battery electrical characteristics as aging occurs. This model was validated using experimental data from an 18650 battery. Online impedance measurements are then performed to update the battery management system in real-time. As such, the battery management system’s performance can be evaluated and can be adjusted. In doing so, state-of-charge and state-of-health estimations can be made with respect to real-time battery impedance rather than by traditional voltage and current measurements. From this, the battery charger and impedance based BMS algorithms can be validated in real-time.