动力锂离子电池荷电状态估计综述

Review of state of charge estimation methods for power lithium-ion battery

电池荷电状态(SOC)是电池管理系统的重要参数,然而SOC无法直接测量,且受应用环境、老化程度、自放电、电流倍率等因素影响,因此SOC估计尤其是在线估计是锂电池研究的一个热点和难点问题。通过对现有各种SOC估计算法进行综述,分析了各种方法的原理和优缺点,总结了各种参考SOC的获取方法和应用场合,并且针对在线SOC估计方法给出了未来的发展趋势。

The state of charge(SOC)of the lithium ion battery is an ultimate important parameter of the battery management system.It can't be measured directly and it is affected by ambient condition,degree of aging,self-discharging,C-rate and so on.So that the SOC estimation becomes research hotspots and difficulties.The various estimation methods for lithium ion battery SOC are summarized,and the principle,the advantages and the disadvantages of all kinds of the classified SOC estimation methods are discussed.Meanwhile,how to get the reference SOC and its applicable application are summarized and the future trends of the online estimation methods are given.