도시철도차량 운영환경을 적용한 리튬배터리 SoC 고찰

Abstract

Batteries for railway vehicles serve as the fundamental power source to maintain system operations, control power, and emergency power. In this paper, we investigate the operating environment and load usage conditions of lithium batteries applied in a 10-car formation of urban railway vehicles in Korea. We measure the initial capacity and SoC-OCV through charge-discharge experiments and select the partial discharge range based on the operating characteristics of urban railway vehicles. During operation, the load characteristics of railway vehicle batteries supply the load through the charging device, except for a certain section, and the battery discharge time is very short compared to the operating time. The charge and discharge experiments, considering the railway vehicle operating environment, show that the initial voltage of the discharge rapidly decreases, followed by linear discharge, and the charge gradually increases depending on the CV charging method of the railway vehicle. In the future, if we utilize the data acquired through the system established in this paper and the data from urban railway vehicles in operation, it is expected to estimate the State of Health(SoH) of lithium batteries installed in urban railway vehicles and be useful for maintenance.