Advanced Solid-State-based Protection Scheme for High-Voltage Li-ion Battery Energy Storage System

The need to increase the charging speed of lithium-ion (Li-ion) battery energy storage systems (BESS) has led to the usage of high-voltage (HV) battery packs in e-mobility applications. External short-circuits (ESCs) might lead to high current rates far beyond the nominal current of a battery pack and hence impose severe impacts on Li-ion batteries by raising the temperature. Moreover, the solid-electrolyte interface (SEI) layer thickness growth rate quickens the capacity fade mechanism due to the increased side reaction current density. To minimize these effects, high-speed and robust protection schemes are required to eliminate ESCs from Li-ion battery pack terminals.