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汽车安全与节能学报

JASE ›› 2017, Vol. 08 ›› Issue (02): 198-204.DOI: 10.3969/j.issn.1674-8484.2017.02.013

• 汽车节能与环保 • 上一篇    下一篇

三元锂电池荷电状态估计的传感器误差影响

郑岳久1,2，许霜霜1，张振东1   

  1. 1. 上海理工大学 机械工程学院，上海 200093，中国；
    2. 清华大学 汽车安全与节能国家重点实验室，北京100084，中国
  • 收稿日期:2017-01-08 出版日期:2017-06-25 发布日期:2017-07-04
  • 作者简介:第一作者 / First author ： 郑岳久(1986—)，男( 汉)，上海，讲师，E-mail: Yuejiu_zheng@163.com。 第二作者/ Second author ： 许霜霜(1990—)，女（汉），上海，硕士研究生，E-mail: xu_susie0912@126.com。
  • 基金资助:

    国家自然科学基金青年基金资助项目(51507102)；汽车安全与节能国家重点实验室开放基金资助项目(KF16022)。

Effect of sensor errors on state of charge estimation for ternary lithium-ion cells

ZHENG Yuejiu1,2, XU Shuangshuang1, ZHANG Zhendong1   

  1. 1.College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093，China ；
    2.State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing100084, China
  • Received:2017-01-08 Online:2017-06-25 Published:2017-07-04

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摘要：

锂电池荷电状态（SOC）的准确估计是电池管理系统的关键技术，为了解析传感器误差对SOC 估计精度的影响，以二阶RC 等效电路模型为基础，运用遗传算法进行参数辨识，采用扩展Kalman 滤波算法进行SOC 估计，分析电压、电流传感器存在的漂移和白噪声对SOC 估计的影响。结果表明：电压、电流传感器的漂移与SOC 估计误差的均值近似呈线性关系，电压、电流传感器存在的白噪声对SOC 估计误差的均值无影响；对于实验中的三元锂离子电池，若使SOC 估计精度在5 %以内，电压的偏差值应控制在10 mV 以内、电流偏差值应在1/30 C 以内。

关键词: 三元锂离子电池, 传感器误差, 荷电状态（SOC）, 扩展Kalman 滤波, 电池等效电路模型, 参数辨识

Abstract:

The accurate estimation of state of charge (SOC) of lithium-ion cells is the key technology of battery management system. The influence of SOC estimation accuracy with the drift or white noise of voltage or current sensor was analyzed to determine the sensor errors on the accuracy of SOC estimation using genetic algorithm to identify model parameters and extended Kalman filter based on the second-order RC equivalent circuit model. The results show that the relationship between offset values and the mean of SOC estimation error has an approximately linear when the voltage or current sensor has drift, but the white noise of the voltage and current sensors has no influence on the mean of the SOC estimation error. If the estimation accuracy of SOC is less than 5% for lithium-ion cell used in the experiment, the voltage and current offset should be controlled respectively within 10 mV and 1/30 C.

Key words: ternary lithium-ion cells, sensor error, state of charge (SOC), extended Kalman filter, battery equivalent circuit model, parameter identification