汽车工程 ›› 2022, Vol. 44 ›› Issue (7): 1080-1088.doi: 10.19562/j.chinasae.qcgc.2022.07.014

所属专题: 新能源汽车技术-动力电池&燃料电池2022年

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基于AUKF的锂离子电池SOC估计方法

王萍,弓清瑞,程泽(),张吉昂   

  1. 天津大学电气自动化与信息工程学院,天津  300072
  • 收稿日期:2021-12-14 修回日期:2021-12-31 出版日期:2022-07-25 发布日期:2022-07-20
  • 通讯作者: 程泽 E-mail:chengze@tju.edu.cn
  • 基金资助:
    国家自然科学基金(61873180)

An AUKF-Based SOC Estimation Method for Lithium-ion Battery

Ping Wang,Qingrui Gong,Ze Cheng(),Ji’ang Zhang   

  1. School of Electrical and Information Engineering,Tianjin University,Tianjin  300072
  • Received:2021-12-14 Revised:2021-12-31 Online:2022-07-25 Published:2022-07-20
  • Contact: Ze Cheng E-mail:chengze@tju.edu.cn

摘要:

本文中提出一种基于自适应无迹卡尔曼滤波器(AUKF)的锂离子电池荷电状态(SOC)估计方法。首先建立电池的2阶RC等效电路模型,并对模型的参数进行辨识;其次针对无迹卡尔曼滤波(UKF)算法的不足,引入一般滤波器的收敛判据,从自适应调整测量噪声、调整过程噪声和修正卡尔曼增益的角度改进UKF算法,形成了基于AUKF的SOC估计方法。最后用测试数据和公开电池数据集进行验证,结果表明该方法具有较快的收敛速度和较高的估计精度。

关键词: 锂离子电池, 荷电状态估计, 自适应无迹卡尔曼滤波器

Abstract:

A state of charge (SOC) estimation method of lithium-ion battery based on adaptive unscented Kalman filter (AUKF) is proposed in this paper. Firstly, the second-order RC equivalent circuit model of battery is established with its parameters identified. Then, aiming at the deficiency of unscented Kalman filter (UKF) algorithm, the convergence criterion for general filter is introduced, and the UKF algorithm is improved by the adaptive adjustment of measurement noise and process noise and the correction of Kalman gain, forming an AUKF-based SOC estimation method. Finally, verifications are performed with test data and public battery dataset, and the results show that the method proposed has fast convergence speed and high estimation accuracy.

Key words: lithium-ion battery, state of charge estimation, adaptive unscented Kalman filter