• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (8): 227-235,243.doi: 10.3901/JME.2022.08.227

• 运载工程 • 上一篇    下一篇

扫码分享

锂离子电池开路电压快速估计研究

刘海东, 周萍, 周正, 郑岳久   

  1. 上海理工大学机械工程学院 上海 200093
  • 收稿日期:2021-05-08 修回日期:2021-09-28 出版日期:2022-04-20 发布日期:2022-06-13
  • 通讯作者: 郑岳久(通信作者),男,1986年出生,副教授。主要研究方向为新能源动力电池管理系统的集成、优化与控制。E-mail:yuejiu_zheng@163.com
  • 作者简介:刘海东,男,1997年出生。主要研究方向为锂离子电池开路电压估计。E-mail:cr7haidong@163.com
  • 基金资助:
    国家自然科学基金(51877138)和上海市青年科技启明星计划(19QA1406200)资助项目。

Fast Estimation of Open Circuit Voltage for Lithium-ion Batteries

LIU Haidong, ZHOU Ping, ZHOU Zheng, ZHENG Yuejiu   

  1. College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093
  • Received:2021-05-08 Revised:2021-09-28 Online:2022-04-20 Published:2022-06-13

摘要: 提出了一种离线式锂离子电池开路电压快速估计方法,在短时间内完成对需要经过长时间搁置才能稳定的开路电压的预估。建立了一个带有权重的电压弛豫模型并利用短时间内搁置电压数据和模型预估值构造损失函数,通过优化算法对损失函数中的参数进行寻优。电池开路电压预估流程包括对电池进行放电,搁置和开路电压预估,整个过程所需时间为30~40 min,即通过30~40 min就可以完成对需要进行数小时静置后才能稳定的开路电压的预估。为了检验此模型的适用性,设计了三元锂电池在不同电池荷电状态(State of charge,SOC)下、不同温度下和以不同的放电倍率放电下开路电压预估的试验,以及设计了电池容量循环衰减试验,并在电池容量衰减后继续对电池开路电压进行预估。试验结果表明,此模型可以通过短时间搁置便能精确地预测电池在不同SOC和不同温度下以及电池容量衰减后的开路电压。提出的离线式锂离子电池开路电压快速估计方法能够快速、准确地预估电池稳定开路电压,在电池SOC以及电池健康状态(State of health,SOH)等状态估计及电池容量估计方面有重要作用,能够大大缩短预估时间。

关键词: 开路电压, 快速估计, 电压弛豫, 容量估计

Abstract: An off-line quick battery open circuit voltage estimation method which can be used to estimate the open circuit voltage that need to be stored for a long time to be stable in a short time was proposed. A voltage relaxation model with weights is established and the loss function is constructed by using the voltage data and the model estimated value to be put in a short period of time. Optimizing the parameters in the loss function by using optimization algorithm. The battery open circuit voltage estimation process including discharging, shelving, and estimating the open circuit voltage. The whole process about 30-40 min, that is, the estimation of the open circuit voltage that can be stable after several hours of standing can be completed in 30-40 min. In order to test the feasibility of this model, an experiment was designed for the open-circuit voltage estimation of LiNixCoyMn1-x-y battery under different state of charge(SOC), different temperature and different discharge rate, then an experiment was designed for the cyclic attenuation of battery capacity, and the open-circuit voltage of the battery was further estimated after the battery aging. The results show that the model can well estimate the open circuit voltage of the battery under different SOC and different temperature. The fast estimation method of battery open-circuit voltage proposed can predict the stable open-circuit voltage rapidly and accurately, which is of great significance in SOC, state of health(SOH) and battery capacity estimation and can greatly shorten the time of estimation.

Key words: open circuit voltage, fast estimation, voltage relaxation, capacity estimation

中图分类号: