汽车工程 ›› 2021, Vol. 43 ›› Issue (11): 1702-1709.doi: 10.19562/j.chinasae.qcgc.2021.11.016

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基于平均-差异模型的电池组短路电流估计

张莉(),高兴奇,张健豪   

  1. 大连理工大学电气工程学院,大连 116000
  • 收稿日期:2021-06-28 修回日期:2021-08-09 出版日期:2021-11-25 发布日期:2021-11-22
  • 通讯作者: 张莉 E-mail:zhanglii@dlut.edu.cn
  • 基金资助:
    国家自然科学基金(51577022)

Short-circuit Current Estimation of Battery Pack Based on Average- difference Model

Li Zhang(),Xingqi Gao,Jianhao Zhang   

  1. College of Electrical Engineering,Dalian University of Technology,Dalian 116000
  • Received:2021-06-28 Revised:2021-08-09 Online:2021-11-25 Published:2021-11-22
  • Contact: Li Zhang E-mail:zhanglii@dlut.edu.cn

摘要:

鉴于电池的内短路是触发热失控的关键环节和快速而有效检测短路的困难,本文提出一种适合不同短路阻值的基于平均-差异模型的串联电池组短路电流估计方法。首先分析了短路电池平均-差异模型的适用性和参数校正方法,并利用迭代最小二乘和卡尔曼滤波对模型参数进行在线辨识。然后推导基于模型参数和电池端电压的短路电流估计表达式和瞬时压降与短路阻值之间的关系,并根据是否有明显瞬时压降将短路电流估计方法分为长时和短时两种。最后实验验证结果表明,该方法可以较精准地对短路电流进行估计,适用于不同阻值的短路检测。

关键词: 锂离子电池, 短路, 故障诊断, 短路电流估计

Abstract:

In view of the difficulty in rapidly and effectively detecting the internal short circuitof battery which is the key link in triggering thermal runaway, a short-circuit current estimation method forseries battery pack suitable for different short circuit resistances is proposed in this paper based on the average-difference model. Firstly, the applicability of the average-difference modelfor short-circuit battery and its parameter correction method are analyzed, and the model parameters are identified online by using iterative least squares and Kalman filtering. Then the short-circuit current estimation expression based on model parameters and battery terminal voltage, and the relationship between the instantaneous voltage drop and the short-circuit resistance are derived, and the way of short-circuit current estimation are divided into long-term and short term two methods according to whether there is an obvious instantaneous voltage drop. Finally, the results of verification experiments show that the method proposed can estimate short-circuit current more accurately, and is suitable for short-circuit detection with different resistance values.

Key words: lithium-ion battery, short circuit, fault diagnosis, short circuit current estimation