锂离子电池Thevenin模型参数确定方法研究

Study on method of determining parameters of Thevenin model of lithium-ion battery

电池管理系统中一个重要的作用就是对电池的状态(SOC,SOH)进行快速准确的估计,而这些状态量由于不能直接测量,所以通常采用基于模型的估算方法进行估计。Thevenin模型相比较于其他电池模型,对电池动态特性进行了描述,考虑了电池极化现象,可以较为准确地描述电池的响应特性,被广泛用于电动汽车动力电池的基础建模中。但是对于相关参数的确定存在计算复杂的不足,提出一种工程实用性较强、简单易操作的最小二乘法估算方法,并且用S imulink模型验证该估算方法的准确度。

One of the important effects of battery management system(BMS)is to estimate the state of the battery(SOC,SOH)quickly and accurately.But these parameters cannot be measured directly,usually the model is used to estimate these parameters.Compared to other battery models,the dynamic characteristics of the battery are described by Thevenin model,considering the battery polarization,which can describe the battery response characteristic more accurately and is widely used in the basic modeling of electric vehicle power battery.However,the calculation of the relevant parameters is complex.A method of least squares estimation of strong engineering practicability was proposed,which is easy to operate.And Simulink model was used to verify the accuracy of the estimation method.