充电极化电压特性建模及估算

摘要

Based on the high-level R-C electrical model, the amplitude characteristics and variation of the charging polarization voltage of lithium-ion power batteries are analyzed quantitatively in the state of charge (SOC) domain and the time domain.So a new model for charging polarization is given, which describes the relationship between polarization voltage with current, SOC, initial polarization state and state of health ( SOH) , and it is proved that the inflection point of polarization voltage gradient with SOC is constant.Finally, a new method to estimate SOC based on the features of charging polarization gradient with SOC is proposed and verified, the estimation error of which is less than 5%.%基于高阶阻容电学模型,对锂离子动力电池充电极化电压的幅值特征和变化规律进行了定量分析,在时域内给出了极化电压的综合模型,阐述了极化电压随电流、荷电状态、初始极化状态以及健康状态(SOH)在时域下的非线性.同时证明了极化电压随荷电状态的变化梯度具有拐点一致性,在此基础上提出了一种基于极化电压和荷电状态估算方法.