汽车用铅酸蓄电池SOC预测研究

电池的开路电压与电池荷电状态(SOC)存在密切的关系,然而大量研究表明,当电池在恒定电流下充放电时,端电压与SOC的变化规律近似于开路电压与SOC的变化规律。但对于汽车用蓄电池来说,并没有文献明确地给出蓄电池在充放电电流变化状态下其端电压与SOC的对应关系表达式。通过对电动汽车用蓄电池进行充放电实验,利用Matlab对实验数据进行曲线拟合处理,得到变化工作电流下的蓄电池SOC与其端电压的数学关系,提出了蓄电池SOC估计的修正经验公式,为电动汽车续航里程的准确估计提供了新方法。

SOC prediction research on lead-acid battery of automobile

It is well known that the open circuit voltage and SOC of battery exist close relationship.However,a large number of studies have shown that when the battery charges and discharges at constant current,the changing rule of the terminal voltage and SOC approximates the changing rule of open circuit voltage and SOC.But for the car battery,no literature clearly gives the corresponding relationship expression of voltage and SOC when charging and discharging current change.Through electricvehicle battery charging and discharging experiments,Matlab was used to process experimental data by curve fitting,getting the mathematical relationship of the battery SOC and voltage under changing current,putting forward the modified empirical formula,providing a new way for accurate estimation of battery driving mileage.