汽车工程 ›› 2024, Vol. 46 ›› Issue (4): 634-642.doi: 10.19562/j.chinasae.qcgc.2024.04.009

• • 上一篇    

融合K-means聚类和序列分解的实车锂电池剩余使用寿命预测

梁弘毅1,陈继开2,3,刘万里1,兰凤崇2,3,莫丙达1,陈吉清2,3()   

  1. 1.广汽本田汽车有限公司,广州 510700
    2.华南理工大学机械与汽车工程学院,广州 510641
    3.华南理工大学,广东省汽车工程重点实验室,广州 510641
  • 收稿日期:2023-08-03 修回日期:2023-09-30 出版日期:2024-04-25 发布日期:2024-04-24
  • 通讯作者: 陈吉清 E-mail:chenjq@scut.edu.cn

Prediction of the Remaining Useful Life of Real Vehicle Lithium Batteries by Fusion of K-means Clustering and Sequence Decomposition

Hongyi Liang1,Jikai Chen2,3,Wanli Liu1,Fengchong Lan2,3,Bingda Mo1,Jiqing Chen2,3()   

  1. 1.Guangqi Honda Automobile Company Limited,Guangzhou 510700
    2.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641
    3.South China University of Technology,Guangdong Provincial Automobile Engineering Key Laboratory,Guangzhou 510641
  • Received:2023-08-03 Revised:2023-09-30 Online:2024-04-25 Published:2024-04-24
  • Contact: Jiqing Chen E-mail:chenjq@scut.edu.cn

摘要:

电动汽车锂离子动力电池健康状态(SOH)衰退过程受使用工况影响存在较多波动,导致模型预测精度下降,在锂电池剩余使用寿命(RUL)短期预测时,SOH波动情况不可忽略,为了准确预测SOH短期内波动情况,须从实车上传的锂电池运行数据中提取有效的健康因子。本文建立一种联合分布特征输入和序列分解融合的锂电池RUL预测方法,使用K-means聚类方法构建车辆锂电池运行过程的联合分布特征,并通过S-G滤波器对SOH衰退曲线进行序列分解,分别使用长短时记忆神经网络(LSTM)和多层感知机(MLP)对趋势部分和波动部分进行预测,融合得到最终预测结果。理论分析和实车采集数据验证表明,融合模型可以在预测车辆锂电池RUL短期衰退趋势的同时预测SOH的波动情况,有较高的短期预测精度。

关键词: 锂离子动力电池, 剩余使用寿命预测, 数据驱动, 深度学习

Abstract:

Influenced by the usage conditions, the state of health (SOH) declining process of lithium-ion power battery of electric vehicles has a lot of fluctuations, which leads to the decrease of model prediction accuracy. In the short-term prediction of the remaining useful life (RUL) of lithium-ion batteries, the SOH fluctuations cannot be ignored, and in order to accurately predict the SOH fluctuations in the short term, effective health indicators need to be extracted from the lithium-ion battery operation data transmitted from real vehicles. A joint distribution feature input and sequence decomposition fusion method for lithium-ion battery RUL prediction is established, using K-means clustering method to construct joint distribution features of vehicle lithium-ion battery operation process, and using S-G filter for sequence decomposition of SOH decline curve. Long-short term memory neural network (LSTM) and multilayer perceptron (MLP) is used respectively for trend part and fluctuation part. The final prediction results are obtained by fusion. The theoretical analysis and the validation of the real vehicle collection data show that the fusion model can predict the short-term decline trend of the vehicle lithium-ion battery RUL while predicting the fluctuation of SOH, and has a high short-term prediction accuracy.

Key words: lithium-ion power battery, remaining useful life prediction, data driven, deep learning