有色金属科学与工程2017，Vol.8Issue(5)：95-102,8.DOI:10.13264/j.cnki.ysjskx.2017.05.014
不同放电倍率磷酸铁锂电池循环性能研究
Study on cycling performance of lithium iron phosphate battery at different discharge rates
摘要
Abstract
The capacity, energy, internal resistance and open-circuit voltage are key indicators to represent the performance of lithium iron phosphate battery and important parameters in battery management system (BMS) design as well.These characteristics are closely related to the charge and discharge rate. The cycling performance of the LiFePO4 battery at different discharge rates was tested at 40℃in terms of battery capacity, energy,AC impedance and open-circuit voltage to investigate their changing laws in the circulation of different discharge rates. The result shows that the relation between discharge capacity and discharge rate follows the rule of power function;battery capacity declines more quickly with a high rate of circulation;the discharge rate has different influences on ohmic impedance and electrochemical impedance of the battery in the course of circulation, that is, the ohmic impedance is little affected by the rate but the electrochemical impedance increases quickly with the rate rising; in addition,the higher the discharge rate,the faster the open-circuit voltage falls in the late cycle;the battery emits less energy,with its heat production increasing,burn-in accelerating and lifetime decreasing in a large current.关键词
磷酸铁锂电池/放电倍率/容量/交流阻抗/开路电压/能量Key words
lithium iron phosphate battery/discharge rate/capacity/AC impedance/open-circuit voltage/energy分类
信息技术与安全科学引用本文复制引用
唐进,徐国锋,李建玲..不同放电倍率磷酸铁锂电池循环性能研究[J].有色金属科学与工程,2017,8(5):95-102,8.基金项目
国家科技支撑计划项目资助(编号:2015BAG01B01) （编号:2015BAG01B01）
