Battery Control Technology of Li-ion Battery System for HEV

Mounting of the lithium-ion batteries (LIB) in hybrid electric vehicles (HEV) calls for the configuration of highly robust control systems. The system configuration described in this paper applies an overcharge prevention system that uses voltage detection with an emphasis on reliability together with a method for varying the range of state of charge (SOC) control in the vehicle according to the battery state in order to assure durability. In order to achieve this, battery-state detection technology was developed for the purpose of correctly detecting and judging the battery state. This battery control system is able to enhancement of durability while obtaining the maximum battery performance.