锂电池一阶RC等效电路模型的动力学特性分析

Dynamic analysis of first-order RC equivalent circuit model for automotive lithium ion power batteries

为分析锂离子动力电池一阶RC等效电路模型的动力学特性,将荷控忆阻器、电阻及电感作为一阶RC等效电路的负载构成一个四阶混沌系统,运用四阶变步长Runge-Kutta法详细分析了该系统的一些基本动力学行为。结果表明,该混沌系统随一阶RC等效电路欧姆内阻参数的变化具有复杂的动力学行为,随欧姆内阻增大,系统通常经混沌进入倍周期分岔序列,且欧姆内阻越小,系统混沌现象越明显。通过对系统的动力学特性分析,可以在线获取欧姆内阻值,为锂离子动力电池寿命的在线监测提供一种全新的方法。

In order to analyze the dynamic characteristics of the first-order RC equivalent circuit model of lithium ion power battery,a fourth-order chaotic system is composed of charge controlled memristor,resistance and inductance as the load of the first-order RC equivalent circuit.Some basic dynamic behaviors of the system are analyzed in detail by using the fourth-order variable step Runge Kutta method.The results show that the chaotic system has complex dynamic behavior with the change of ohmic internal resistance parameters of the first-order RC equivalent circuit.With the increase of ohmic internal resistance,the system usually enters the period doubling bifurcation sequence through chaos,and the smaller the ohmic internal resistance,the more obvious the chaotic phenomenon of the system.By analyzing the dynamic characteristics of the system,the ohmic resistance value can be obtained online,which provides a new method for online monitoring of lithium ion power battery life.