摘要
针对梯次利用锂离子动力电池特性衰退不一致的问题,通过一系列充放电试验,分析了该种电池的容量内阻特性。发现车用电池经多次循环使用后容量和内阻参数符合正态分布,且两者之间没有必然的相关性,继而分析了电池的开路电压特性以及倍率特性。试验表明车用淘汰锂离子电池SOC=0时开路电压离散程度最高,旧电池进行大倍率充放电时相比新电池极化严重,可用容量明显降低,因此梯次利用电池适合投入到小倍率充放电的储能工况中。
Aiming at the characteristic of second use of lithium-ion batteries declining inconsistently, their capacity and resistance were studied through a series of charging-discharging tests. Capacity and resistance parameters conform to the normal distribution after many cycles. And there is no certain correlation between them. Then open circuit voltage and charging-discharging ratio characteristics were analyzed. The open circuit voltage dispersion degree is the highest when SOC is zero. Polarization of the old batteries is higher and available capacity of the old batteries is lower than the new batteries when batteries work at high current. So, the second use of lithium-ion batteries fits energy storage operating condition of small current.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第11期1940-1943,共4页
Chinese Journal of Power Sources
基金
北京市科委项目(Z111100056011014)
关键词
动力锂电池
内阻
容量
开路电压
倍率特性
lithium-ion battery
resistance
capacity
open circuit voltage
ratio characteristic
