电动汽车磷酸铁锂电池放电静置电压预测方法  

A voltage prediction method for still standing LiFePO_4 batteries for EV after discharging

作　　者：侯俊伟 李礼夫[1] HOU Jun-wei;LI Li-fu(Mechanical and Automotive Engineering,South China University of Technology,Guangzhou Guangdong 510640,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《电源技术》2018年第7期968-969,1029,共3页Chinese Journal of Power Sources

基　　金：广东省协同创新与平台环境建设专项资金项目(2014B090901054)

摘　　要：针对纯电动汽车在加速、减速交替期间,由于其动力电池放电后静置开路电压变化而导致电池组荷电状态(SOC)测量困难和估计误差大的难题,以某款磷酸铁锂动力电池为对象,根据电池电化学和等效电路理论,研究了基于行驶过程的纯电动汽车磷酸铁锂动力电池放电后静置开路电压随其时间变化的关系,运用系统辨识方法,通过实验建立了动力电池放电后静置开路电压预测模型,并以此对其进行实验验证,验证了该预测模型的可行性。For that there are difficulties in measuring the state of charge(SOC)and big estimation errors generated by the instability of the open-circuit voltage at the relaxation state after power battery discharging during the alternate acceleration and deceleration of electric vehicle,an LiFePO4 battery was taken as the research object,and based on electrochemistry and equivalent circuit theory.This research studied the change relation between the open-circuit voltage at the relaxation stage after discharging of the LiFePO4 battery in moving electric vehicle with time,and combined with system identification method.An open-circuit voltage prediction model of lithium iron phosphate batteries was established,and the experiment was carried out to verify the feasibility of that model.

关 键 词：电动汽车 磷酸铁锂 开路电压 预测 

分 类 号：TM912.9[电气工程—电力电子与电力传动]