Battery/Supercapacitor Hybrid Energy Storage System

PHEVs and EVs generally use the lithium ion battery as the energy storage system. However, the durability of lithium battery needs to be further improved, and the cost of replacing the battery is high. Especially in low temperature environments, the battery degradation rate increases. Therefore, the battery/supercapacitor hybrid energy storage system (HESS) is a good solution to solve the problem mentioned above. We optimize the configuration, component size, and energy management strategy (EMS) of the HESS and propose the integrated optimization methodology to simultaneously optimize the component size and EMS since they are intrinsically coupled. In addition, the control algorithm for current/voltage regulation is designed based on the sliding mode technique and Lyapunov stability theory.