摘要
随着电动汽车保有量的增加,从电动汽车上淘汰下的动力电池将大量出现。车用动力电池直接进入材料回收模式将造成资源的严重浪费。将淘汰的车用动力电池用于其他工况,实现动力电池的梯次利用,可以有效延长动力电池的全寿命周期,降低动力电池的使用成本,提高资源的有效利用率。以磷酸铁锂动力电池为研究对象,通过常规循环和典型电网储能工况循环,分析动力电池放电容量、直流内阻、可用功率等特性参数的变化规律,研究磷酸铁锂动力电池电网储能工况梯次利用的可行性。研究发现,不同工况下,动力电池放电容量衰减速率不同。常规循环衰减较快,电网储能工况衰减缓慢,但均遵循y=a+b×x的线性关系衰减。淘汰的车用动力电池用于电网储能工况,可有效增加约3年使用周期,大幅延长动力电池的寿命周期。
As the increasing of NEV holdings, there would be lots of batteries retiring from electric vehicles. It was great waste if these batteries were put into materials recycling phase. So making these batteries would be used in other fields, that could carry the battery echelon use out, extend the battery life, reduce the cost of batteries, and rise the resource utilization. LFP power battery was taken as example, via normal cycle and net grid energy storage cycle, and the attenuation rule of capacity, resistance, and available power were analyzed, research on the feasibility of battery echelon use was done. The rate of capacity decay in different situation was different, it was larger in normal cycle, but they all followed y=a＋b×x. And there was about 3 years when the batteries retired from EV were used in net grid energy storage situation, so it did great benefit to extend the battery life and reduce the cost.
出处
《电源技术》
CAS
CSCD
北大核心
2016年第3期521-524,共4页
Chinese Journal of Power Sources
基金
国家"863"高技术项目(2014AA052211)
