储能科学与技术 ›› 2019, Vol. 8 ›› Issue (4): 738-744.doi: 10.12028/j.issn.2095-4239.2019.0015

• 研究开发 • 上一篇    下一篇

车用动力电池二阶RC建模及参数辨识

罗勇1,2,3, 赵小帅2, 祁朋伟2, 刘增玥3, 邓涛3, 李沛然1   

  1. 1 中国汽车工程研究院股份有限公司, 汽车噪声振动和安全技术国家重点实验室, 重庆 400054;
    2 重庆理工大学, 汽车零部件先进制造技术教育部重点实验室, 重庆 400054;
    3 重庆青山工业有限责任公司, 重庆 400054
  • 收稿日期:2019-02-20 修回日期:2019-03-12 出版日期:2019-07-01 发布日期:2019-03-14
  • 通讯作者: 罗勇(1983-),男,副教授,从事新能源汽车、车辆动力传动与控制相关研究,E-mail:77327630@qq.com。
  • 作者简介:罗勇(1983-),男,副教授,从事新能源汽车、车辆动力传动与控制相关研究,E-mail:77327630@qq.com。
  • 基金资助:
    国家自然科学基金资助(51305475);汽车噪声振动和安全技术国家重点实验室2017年度开放基金资助(NVHSKL-201702);重庆市教委科学技术研究项目(KJQN201801143);重庆市重点产业共性关键技术创新专项(cstc2015zdcy-ztzx60013)。

Second-order RC modeling and parameter identification of electric vehicle power battery

LUO Yong1,2,3, ZHAO Xiaoshuai2, QI Pengwei2, LIU Zengyue3, DENG Tao3, LI Peiran1   

  1. 1 State Key Laboratory of Vehicle NVH and Safety Technology, China Automotive Engineering Research Institute Co., Ltd., Chongqing 400054, China;
    2 Key Laboratory of Advanced Manufacturing Technology for Automobile Parts, Chongqing University of Technology, Chongqing 400054, China;
    3 Department of Technology, Chongqing Tsingshan Industrial Co., Ltd., Chongqing 400054, China
  • Received:2019-02-20 Revised:2019-03-12 Online:2019-07-01 Published:2019-03-14

摘要: 建立精确的动力电池模型是电池管理系统(battery management system,BMS)开发过程中的重要环节,电池系统具有较强的非线性特性,其模型参数随多种因素的变化而变化。在电池模型参数辨识过程中,考虑的可变因素越多,辨识结果越准确,但模型的运行速度将降低,影响其实际应用。在各种可变因素中,电池荷电状态(state of charge,SOC)对电池模型参数的影响最为显著,对不同SOC下电池模型参数进行辨识并应用于电池模型,将在提高模型精度的同时保持较好的实时性。本文以动力锂电池为对象,采用二阶RC等效电路模型,通过试验得到电池组在不同SOC下的回弹电压数据,采用最小二乘拟合法辨识不同SOC状态下的模型参数。在此基础上搭建模型参数随SOC变化的实时仿真模型,并对模型进行仿真和试验验证,结果表明模型具有较高的精度和实时性。

关键词: 新能源汽车, 电池管理系统, 参数辨识, 二阶RC模型

Abstract: Establishing accurate power battery model is one of the key issues in the development of battery management system (BMS). Battery has strong non-linear characteristics, and its model parameters vary with various factors. In battery model parameter identifcation, the more variable factors are considered, the more accurate the identification results are, but the running speed of the model will be reduced, which will affect its practical application. Among all kinds of variable factors, state of charge (SOC) has the most significant impact on battery model parameters. Identifcation and application of battery model parameters under different SOC will improve the accuracy of battery model while maintaining good real-time performance. In this paper, the secondorder RC equivalent circuit model is used for power lithium batteries. The rebound voltage data of batteries under different SOC conditions are obtained through experiments. The least square ftting method is used to identify the model parameters under different SOC conditions. Furthermore, a real-time simulation model of model parameters varying with SOC is built, and the model is simulated and verifed by experiments. The results show that the model has high accuracy and realtime performance.

Key words: electric vehicle, battery management system, parameter identifcation, second order RC model

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