电动车用电池充电状态和功率强度估计

Estimation of state of charge and power capability of battery used in electric vehicle

讨论了电动车 (EV)和混合电动车 (HEV )用电池电量模型和功率模型的建立 ,提出了一种新的电池剩余电量(SOC)和电池功率强度 (Powercapability)的综合估计方法。从电化学角度建立了一个电池参考模型 ,以安时计量为主并综合考虑影响电池SOC的多种因素进行SOC估计 ,功率强度估计主要基于电池等效内阻的估算。SOC估计和功率强度估计相结合 ,实现了在功率强度估计的同时对SOC估计提供自调整机制。该综合估计方法已经在我们自主开发的实验平台上实现 。

The establishment of coulombic model and power model of the battery used in electronic vehicle (EV) and hybrid electric vehicle (HEV) was discussed. A novel estimation method of state of charge (SOC) integrating with power capability was also introduced. A battery model was established on the basis of electrochemistry. Referring to the model, SOC is mainly estimated with Ah measurement by co nsidering various influencing factors, while the estimation of power capability is based on the calculation of equivalent internal resistance of battery. By the integration of estimation of SOC combined with power capability, power capability is estimated and the self adjustment mechanism is provided simultaneously. The novel method is realized on the experimental platform that we developed and is proved to be feasible by practice.