磷酸铁锂电池充放电过程中的热性能  

Thermal performance of LiFePO_4 cell during charge-discharge process

作　　者：张锋[1] 肖忠良[1] 宋刘斌[1,2] 谢峥璨[1] 曾巨澜[1] 

机构地区：[1]长沙理工大学化学与生物工程学院湖南省电力和交通材料保护重点实验室,湖南长沙410004 [2]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《电源技术》2013年第9期1530-1532,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助项目(21003014);湖南省科技计划资助项目(2011GK3119,2010FJ3167);湖南省电力和交通材料保护重点实验室资助项目(2012CL08)

摘　　要：采用电化学-量热法对磷酸铁锂电池在30℃不同倍率下充放电过程中的电参数、热流进行精确测量,研究其热性能。结果表明:电池0.2充电和放电初始阶段的热流缓慢增大,而0.5和1充放电初始阶段的热流快速增大;电池充电和放电过程中的热流、产热量随着充放电倍率的升高而增大。根据电池0.2,0.5,1充放电过程中的电流、热流和时间数据计算得到电池充放电过程的产热量、电极反应物质的量,从而计算出电池0.2充电和放电过程电极反应的驻r m分别为-7.074和7.266 J/mo·lK。The electrical parameter and heat flow of LiFePO4/Li cell during the charge-discharge process at different rates and 30 ℃ were measured precisely by electrochemical-calorimetric method. Then the thermal performance of cell was investigated. The results show that the heat flow of cell increases slowly in the initial stage of charging and discharging at 0.2 C, while increases rapidly in the initial stage of charging and discharging at 0.5 C and 1 C. The heat flow and heat output of cell during the charge-discharge progress increase as the increase of charge-discharge rate. The heat output, quantity of electrode reaction mass for cell during the charge-discharge process at 0.2 C, 0.5 C, 1 C were calculated according to the current, heat flow and time, and the △rSm of electrode reaction for cell during charge-discharge at 0.2 C was calculated as -7.074 and 7.266 J/mol. K respectively on the basis of work above.

关 键 词：电化学-量热法 LIFEPO4 热流 熵变 

分 类 号：TM912[电气工程—电力电子与电力传动]