At present , there were increasingconcerns about environmental and energy problems , electric vehicles have been developed for it ' s benefit of zero emission and low noise . many countries make electric vehicles as the development direction of motor industry . the key technology of electric vehicles is the energy management system 当前,随着环保和能源问题日益突出,电动汽车以其零排放、低噪声等优点而受到关注,世界各国都把电动汽车作为汽车工业的发展方向,电动汽车能量管理系统是关系到电动汽车实用化、商品化的关键技术之一,而作为能量管理系统重要组成部分的电池剩余容量测试的研究对电动汽车的实用化、商品化起着重要作用。