电动汽车动力电池变流放电特性与荷电状态实时估计  

VARIABLE CURRENT DISCHARGE CHARACTERISTICS AND SOC ESTIMATION OF EV/HEV BATTERY

作　　者：裴锋[1] 黄向东[1] 罗玉涛[1] 赵克刚[1] 

机构地区：[1]华南理工大学电动汽车研究广东省重点实验室,广东省广州市510640

出　　处：《中国电机工程学报》2005年第9期164-168,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50275053);广东省自然科学基金重点项目(020857);广州市重大科技攻关项目(023G3036)~~

摘　　要：通过对电动汽车常用的铅酸动力电池大电流变流放电实验数据与特性的研究,建立以能动势和计算等效内阻为基本参数的电池动态模型,并得到了当电池放电电流大于某一特定临界电流时电池等效内阻趋于稳定的规律。基于这一重要规律,实现了以能动势为依据来估计电池荷电状态(SOC)的方法。该方法在电池大电流放电时,可以仅根据放电电流和在线端电压来估计SOC。分析和初步实验表明,这种电池SOC估计方法简单易行,实时性强,应用前景良好。Through studying and characterizing variable current-discharge test data, along with dynamic modeling of battery used for EV/HEV with the equivalent electromotive potential and resistance as essential parameters, it is discovered that the equivalent resistance of the battery tends to be stabilized when the discharge current is greater than a certain point. Based on this important fact, a method relies on the equivalent electromotive potential for battery’s state-of-charge (SOC) estimation is detailed, which allows estimating the SOC simply by discharge current and terminal voltage of the battery. Its convenience and effectiveness for on-line real-time application are also proven by analyses and pilot tests.

关 键 词：荷电状态 动力电池 电动汽车 实时估计 放电特性 等效内阻 放电电流 大电流放电 实验数据 电流变流 动态模型 临界电流 估计方法 SOC 端电压 实时性 能动 铅酸 

分 类 号：TM912.1[电气工程—电力电子与电力传动] TN713[电子电信—电路与系统]