提高安时积分法估算电池SOC精度的方法比较

Comparison of methods for improving SOC estimation accuracy through an ampere-hour integeration approach

安时积分公式中相关参数的取值是影响安时积分法估算电池SOC(state of charge)的估算精度的重要因素。各类提高估算精度的方法分别对某些参数进行了修正和优化,但缺少各参数对精度影响大小的比较。该文通过对3.2V/11 A.h磷酸铁锂动力电池进行测试,比较了各参数对于提高SOC估算精度的重要性。结果表明,初始SOC修正方法对于提高安时积分法的精度最为重要。

Accurate values of the ampere-hour integration parameters are necessary to accurately estimate battery SOC （state of charge）. Different methods have concentrated on correcting various parameters. However, there is insufficient information on the importance of each parameter on the SOC accuracy. Tests were conducted on a 3.2 V/11 A·h power LiFePO4 Li-ion battery to accurately describe the effect of various parameters on the SOC estimation accuracy. The results show that the initial SOC correction is vital to the accuracy.