二次利用磷酸铁锂动力电池并联特性研究

Study on the characteristics of second life LiFePO_4 batteries

随着电动汽车的快速发展,未来将有大量的动力电池退役,这些淘汰下来的电池仍有可观的剩余容量和寿命,可以在静态储能等领域实现梯次利用。为了提高安全性和输出性能,淘汰下来的动力电池需要在筛选之后重新串、并联成组使用。以二次利用磷酸铁锂动力电池为研究对象,研究在单体电池内阻不一致、剩余容量不一致、初始SOC不一致等情形下,电池组的并联特性,即并联电池组中各电池直流阻抗、电流不平衡度的变化情况。对于实现磷酸铁锂动力电池的梯次利用具有指导意义。

With the rapid development of electric vehicle, there will be a large number of retired power batteries in the future. These retired batteries have considerable remaining capacity and lifetime, and can be used for energy storage. In order to improve the safety and output performances, the retired cells should be re-sorting and assembling in series/parallel. To study their performance of a battery using cells with distributed internal resistance, capacity, and initial SOC helps to the realization of the reuse of lithium iron phosphate power battery for energy storage.