基于EMF等效模型电动车镍氢电池SOC估计

讨论了电动汽车镍氢动力电池荷电状态(State of Charge,简称SOC)的估计方法。提出用电动势(EMF)等效电路模型法来估计电池的SOC。研究确定了EMF与SOC之间的关系,并通过电路分析,计算得出电池EMF与端电压之间的关系,最终建立了端电压与SOC关系。通过实测数据并利用模型估计数据的对比得出,SOC的误差在混合动力汽车的允许误差范围内。该方法在车辆停车和行驶时均适用。

SOC Estimation Of NiMH Battery used in EV based on EMF Equivalent Circuit Model

It is very important to estimate state of charge(SOC) of NiMH battery in EV/HEV.The SOC estimation is discussed and EMF equivalent circuit model is proposed to estimate the SOC of NiMH battery.From the experiment data,it shows a relation between EMF and SOC.Then,according to analysis of the equivalent circuit,a relation curve between EMF and terminal voltage can be drawn.Finally,SOC can be estimated by terminal voltage.A conclusion is that the SOC error of this method is small from measured data and calculated data.Therefore,it is suitable for EV/HEV to use EMF equivalent circuit model to estimate SOC.Both in driving and parking state,the method is good.