一种基于预测开路电压估算SOC初值的方法  

A Method of Initial SOC Estimate based on Prediction of Open-Circuit Voltage

作　　者：龙宇舟 郭毅锋[1] 韩峻峰[1] 潘盛辉[1] 

机构地区：[1]广西科技大学电气与信息工程学院,广西柳州545006

出　　处：《通信电源技术》2014年第3期14-16,24,共4页Telecom Power Technology

基　　金：广西自然科学基金项目(2013GXNSFBA019241);广西汽车零部件与整车技术重点实验室基金项目(13-051-38;2013KFMS02)资助

摘　　要：为解决电动汽车动力电池SOC初值估算问题,文章以锂离子动力电池为对象,进行了脉冲放电实验,拟合了锂离子动力电池开路电压与SOC函数关系式。对七阶Thevenin等效电池模型进行了参数辨识,预测了锂离子电池开路电压,将预测的开路电压代入开路电压与SOC函数关系式进行了SOC初值的估计。通过仿真实验,得出SOC初值估计误差为0.1321%。文中SOC初值估算精度优于市场上通用的电池容量检测仪精度,验证了预测开路电压估算SOC初值方法的可行性。In order to solve the problem of estimating the initial SOC,this paper takes the lithium ion power battery as the research obj ect.According to the pulse discharge experiment ,the relation of the open circuit voltage and the SOC is fit-ted .The paper finished predicting the open circuit voltage by identifying the parameters of the seven classes Thevenin mod-el.Put the predicted open circuit voltage into the relation of the open circuit voltage and the SOC to predict the initial SOC. The initial SOC error is 0.1321% in the simulated experiment .The paper indicated that the estimated accuracy of the initial SOC is better than the accuracy of the common battery capacity estimated machine,so the method of the paper is feasible.

关 键 词：锂离子动力电池 Thevenin等效电池模型 预测开路电压 SOC初值 

分 类 号：TM912[电气工程—电力电子与电力传动]