摘要
锂动力电池内阻是衡量电动汽车用电池性能的一个重要参数。本文中研究了不同环境温度、放电倍率和放电深度下的电池内阻随循环次数而变化的规律。结果表明,电池内阻与循环次数之间呈幂指数关系。电池内阻变化率与环境温度之间近似于二次函数关系,当环境温度为20℃时,电池内阻及其随循环次数的变化率均最小;电池内阻变化率随放电倍率的增大而增大,当放电倍率为1C时,电池内阻变化率基本上不随循环次数而变化,而当放电倍率为1.5C和2C时,电池内阻变化率随循环次数增加而明显增大;放电深度为25%和50%时,电池内阻变化率随循环次数的变化曲线相近,当放电深度达到100%时,电池内阻变化率显著增大。单次循环放电中,放电深度为0~80%时,电池内阻随放电深度的变化较小,当放电深度为80%~100%时,电池内阻随放电深度的增加而急剧增加。
The internal resistance of lithium-ion power battery is one of the important parameters in evalua-ting the perl＇ormance of batteries for electric vehicles. In this paper,the law of the change of battery internal resist-ance with the changes of ambient temperature, discharge rate and the depth of discharge are studied. The results show that the relationship between battery internal resistance and cycle number follows power index function,while that between the changing rate （with cycle number） of battery internal resistance and ambient temperature is close to quadratic function. When temperature is 20^,both battery internal resistance and its changing rate reaches mini-mum. The changing rate of battery internal resistance increases with the rise of discharge rate,and it hardly changes with cycle number at a discharge rate of 1C,while apparently increases with the rise of cycle number when dis-charge rate is 1. 5C or 2C. The curves of the changing rate of battery internal resistance versus cycle number are rather close to each other for discharge depth of 2 5 % and 50%,but the curve rapidly rise when discharge depth rea-ches 100%. In single cycle discharge, the change of battery internal resistance with discharge depth is relatively small when the depth of discharge is below 80%,and it rapidly increases when the depth of discharge exceeds 80%.
出处
《汽车工程》
EI
CSCD
北大核心
2017年第5期503-508,516,共7页
Automotive Engineering
关键词
锂动力电池
电池内阻
放电倍率
放电深度
lithium-ion power battery
battery internal resistance
discharge rate
depth of discharge
