实际使用工况的锂离子电池SOC-OCV关系

摘要

通过对电动汽车用锂离子电池荷电状态(SOC)与开路电压(OCV)的关系研究,发现其SOC与OCV有着良好的对应关系;同时,在电池实际使用工况(不同使用温度和不同使用寿命)条件下,通过温度修正系数和容量衰减因子的调整,SOC与OCV的关系仍能够始终保持一致.最后提出了基于电池等效电路模型的快速SOC-OCV关系估计方法,从而为开发基于OCV的实际使用工况下的电池管理控制策略提供了理论依据和数据支撑.%The relationship between SOC and OCV of lithium ion battery was studied.It's found that SOC has good relationship with OCV.At the same time,the temperature correction factor and capacity fading factor were adjusted to make the relationship between SOC and OCV still consistent under actual application condition containing different temperature and life.A fast SOC-OCV relation estimation method based on battery equivalent circuit model was put forward,providing theoretical basis and data support for the development of battery management control strategy based on OCV under actual application condition.