华南理工大学学报(自然科学版) ›› 2020, Vol. 48 ›› Issue (2): 69-75.doi: 10.12141/j.issn.1000-565X.180562

• 交通运输工程 • 上一篇    下一篇

基于 STEKF 的锂离子动力电池 SOC 估算

田晟1 吕清1 李亚飞2   

  1. 1. 华南理工大学 土木与交通学院,广东 广州 510640; 2. 广州汽车集团股份有限公司,广东 广州 511434)
  • 收稿日期:2018-11-13 修回日期:2019-09-04 出版日期:2020-02-25 发布日期:2020-02-01
  • 通信作者: 田晟(1969-),男,博士,副教授,硕士生导师,主要从事新能源汽车与动力电池技术研究。 E-mail:shitian1@scut.edu.cn
  • 作者简介:田晟(1969-),男,博士,副教授,硕士生导师,主要从事新能源汽车与动力电池技术研究。
  • 基金资助:
    国家留学基金资助项目 ( 201706155003) ; 广东省科技计划项目 ( 2015A080803001)

SOC Estimation of Li-Ion Power Battery Based on STEKF

TIAN Sheng1 Lü Qing1 LI Yafei2#br#   

  1. 1. School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China; 2. Guangzhou Automobile Group Co.,Ltd.,Guangzhou 511434,Guangdong,China
  • Received:2018-11-13 Revised:2019-09-04 Online:2020-02-25 Published:2020-02-01
  • Contact: 田晟(1969-),男,博士,副教授,硕士生导师,主要从事新能源汽车与动力电池技术研究。 E-mail:shitian1@scut.edu.cn
  • About author:田晟(1969-),男,博士,副教授,硕士生导师,主要从事新能源汽车与动力电池技术研究。
  • Supported by:
    Supported by the China Scholarship Council Program ( 201706155003) and the Science and Technology Plan- ning Project of Guangdong Province ( 2015A080803001)

摘要: 为能在线准确估算电动汽车动力电池的荷电状态 ( SOC) ,提出了一种基于强追踪扩展卡尔曼滤波 ( STEKF) 的锂离子电池的 SOC 估算方法,该滤波器引入了多重次优渐消因子; 以某型锂离子电池为研究对象,基于电池的外特性及相关机理,建立了电池的二阶 RC 等效电路模型,使用最小二乘法辨识模型参数,然后按照等效电路模型建立电池的 STEKF 非线性状态空间方程,最后在 ECE15 工况下进行仿真。结果表明, STEKF 估算电池 SOC 的误差保持在 2% 以内,该方法能准确估算电池的 SOC。

关键词: 锂离子电池, 荷电状态, 等效电路模型, 强追踪扩展卡尔曼滤波

Abstract: A method based on strong tracking extended Kalman filter ( STEKF) with multiple suboptimal fading factors was proposed to accurately estimate the state of charge ( SOC) of EV power batteries online. Taking a lithi- um-ion battery as the research object,the second-order RC equivalent circuit model of a lithium-ion battery was es- tablished based on its external characteristics and related mechanism. Then the least square method was used to identify the model parameters,and the STEKF nonlinear state space equation of the battery was established accor- ding to the equivalent circuit model. Finally,the simulation was carried out under ECE15 condition. The results show that the error of STEKF in estimating battery SOC is kept within 2% ,so this method can estimate battery SOC accurately.

Key words: lithium-ion battery, state of charge, equivalent circuit model, strong tracking extended Kalman fil- ter