基于动态规整与改进变分自编码器的异常电池在线检测方法

郭铁峰; 贺建军; 申帅; 王翔; 张彬汉

doi:10.11999/JEIT230084

基于动态规整与改进变分自编码器的异常电池在线检测方法

doi: 10.11999/JEIT230084

中南大学自动化学院长沙 410083

基金项目: 国家重点研发计划(2020YFB1710600)

详细信息

作者简介:
郭铁峰：男，博士生，研究方为智能检测与控制、机器学习等

贺建军：男，教授，博士生导师，研究方向为智能检测与控制、机器学习、系统建模与优化控制等

申帅：男，博士生，研究方向为智能检测、自动控制和机器学习

王翔：男，博士生，研究方向为稀疏表示、深度学习等

张彬汉：男，硕士生，研究方向为稀疏表示、深度学习等

通讯作者:
贺建军　jjhe@csu.edu.cn

中图分类号: TN911; TP183
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- 文章访问数: 324
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- 被引次数: 0
出版历程
- 收稿日期: 2023-02-22
- 修回日期: 2023-06-16
- 网络出版日期: 2023-06-28
- 刊出日期: 2024-02-10

Abnormal Battery On-line Detection Method Based on Dynamic Time Warping and Improved Variational Auto-Encoder

School of Automation, Central South University, Changsha 410083, China

Funds: National Key R&D Program of China (2020YFB1710600)

摘要

摘要: 针对电池生产成组过程中，传统异常检测方法对混入的容量及压差异常电池检测精度低及生产结束后离线异常检测方法效率低等问题，该文提出一种集合长短期记忆变分自编码器与动态时间规整评价的锂电池异常在线检测方法(VAE-LSTM-DTW)，实现了异常电池的在线检测，避免了离线异常检测所造成的时间和能源的浪费。该方法首先将长短期记忆网络(LSTM)引入变分自编码器(VAE)模型，训练电池时序数据重构模型；其次，在电池异常检测的度量标准中引入动态时间规整值(DTW)，并基于贝叶斯寻优获得最优检测阈值，对每个单体电池重构数据的动态规整值进行异常辨别。实验结果表明，相较该领域传统异常检测方法，VAE-LSTM-DTW模型性能优越，查准率和F1值都得到了较大的提升，具有较高的有效性和实用性。
- 锂电池 /
- 异常检测 /
- 变分自编码器 /
- 动态时间规整 /
- 长短期记忆网络 /
- 贝叶斯优化
Abstract: In the process of battery production, the traditional detection accuracy of abnormal batteries is poor, and the offline anomaly detection method after production is inefficient. To solve these problems, a lithium battery anomaly online detection method integrating Long Short-Term Memory Variational AutoEncoder and Dynamic Time Warping evaluation (VAE-LSTM-DTW) is proposed, which realizes the online detection of abnormal battery conditions and prevents the time and energy wastage caused by offlize anomaly detection. Firstly, the Long Short-Term Memory (LSTM) is introduced into the Variational Auto-Encoder (VAE) model to train the battery time series reconstruction model. Secondly, in battery anomaly detection, the Dynamic Time Warping value (DTW) is introduced into the evaluation index, and the optimal detection threshold is obtained based on Bayesian optimization, and the dynamic warping value of each single battery reconstruction data is abnormally identified. The experimental results indicate that, compared with the traditional anomaly detection methods in this field, the VAE-LSTM-DTW model has superior performance, the accuracy rate and F1-score have been greatly improved, and it has high effectiveness and practicability.
- Lithium battery /
- Anomaly detection /
- Variational Auto-Encoder(VAE) /
- Dynamic Time Warping(DTW) /
- Long Short-Term Memory(LSTM) /
- Bayesian optimization

HTML全文

图 1 锂电池异常检测模型结构图

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图 2 变分自编码器模型结构图

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图 3 VAE-LSTM模型结构图

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图 4 DTW最优路径

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图 5 生产现场化成分容设备图

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图 6 原始数据集曲线图

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图 7 重构模型训练损失函数变化

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图 8 异常电池充电曲线分类图

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图 9 DTW分布箱线图

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图 10 阈值寻优流程图

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图 11 4类度量标准检测结果分布对比图

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图 12 消融实验异常检测结果分布对比图

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表 1 数据集构建情况表

数据集分类	正常电池 (个 )	正常占比(%)	异常电池(个)	异常占比(%)
重构训练集	4 000	100	0	0
评价阈值训练集	4 000	50	4 000	50
测试集	4 000	50	4 000	50

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表 2 阈值确定10折验证实验结果表

实验轮次	阈值训练集		阈值测试集	平均最优阈值
实验轮次	最优阈值	F1值	F1值	平均最优阈值
1	0.2175	0.9776	0.9749	0.2169
2	0.2169	0.9766	0.9836
3	0.2159	0.9770	0.9810
4	0.2164	0.9779	0.9710
5	0.2169	0.9773	0.9773
6	0.2159	0.9773	0.9774
7	0.2171	0.9780	0.9707
8	0.2176	0.9776	0.9748
9	0.2179	0.9762	0.9887
10	0.2169	0.9777	0.9735

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表 3 重构效果度量标准对比实验

距离	准确率(%)	查准率(%)	召回率(%)	F1值	阈值
Euclidean	62.8	71.9	72.6	0.72	0.0873
Frechet	65.0	78.6	65.3	0.71	0.5202
Hausdorff	82.7	89.7	83.7	0.87	0.0150
DTW	91.2	95.1	91.7	0.93	0.2169

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表 4 机器学习模型异常检测对比实验

模型	准确率(%)	查准率(%)	召回率(%)	F1值
OCSVM	67.2	61.0	95.4	0.744
LOF	68.2	63.0	88.7	0.736
IForest	62.4	57.1	98.0	0.725
VAE-LSTM-DTW	91.1	94.9	91.7	0.933

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表 5 模型异常检测消融实验结果

模型	准确率(%)	查准率(%)	召回率(%)	F1值	阈值	单体电池检测时间(s)
VAE	68.9	71.9	87.5	0.79	5.1× 10^–5	0.002
VAE-LSTM	73.2	76.0	83.4	0.79	4.3 × 10^–5	0.014
VAE-DTW	87.8	90.6	91.2	0.91	0.2052	0.075
VAE-LSTM-DTW	91.1	94.9	91.7	0.93	0.2169	0.084

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