Solid-State Battery-Systems and Thermal Management for Electric Long-Distance Buses

Abstract

Solid-state batteries are promising for electric mobilityas they potentially offer higher energy densities andtherefore driving range, long-life and safety. They comewith changed thermal properties and thermal managementrequirements. In this paper a comparison of a solid-statebattery system with a state-of-the-art liquid batterysystem is presented. This study compares a solid-statebattery with a state-of-the-art liquid NMC battery for anelectric coach on typical real-world long-distance routes,including fast-charging. The thermal management isperformed by a reversible R744 heat pump. By designing bothbattery systems for the same energy capacity, thesolid-state battery releases more heat duringfast-charging. At the same battery system size, thesolid-state battery significantly outperforms the liquidbattery system in driving range and does not need morecooling.