Battery State-of-Health Estimation: A Step towards Battery Digital Twins

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12 Citations (Scopus)

Abstract

For a lithium-ion (Li-ion) battery to operate safely and reliably, an accurate state of health (SOH) estimation is crucial. Data-driven models with manual feature extraction are commonly used for battery SOH estimation, requiring extensive expert knowledge to extract features. In this regard, a novel data pre-processing model is proposed in this paper to extract health-related features automatically from battery-discharging data for SOH estimation. In the proposed method, one-dimensional (1D) voltage data are converted to two-dimensional (2D) data, and a new data set is created using a 2D sliding window. Then, features are automatically extracted in the machine learning (ML) training process. Finally, the estimation of the SOH is achieved by forecasting the battery voltage in the subsequent cycle. The performance of the proposed technique is evaluated on the NASA public data set for a Li-ion battery degradation analysis in four different scenarios. The simulation results show a considerable reduction in the RMSE of battery SOH estimation. The proposed method eliminates the need for the manual extraction and evaluation of features, which is an important step toward automating the SOH estimation process and developing battery digital twins.
Original languageEnglish
Article number587
JournalElectronics
Volume13
Issue number3
ISSN2079-9292
DOIs
Publication statusPublished - Feb 2024

Keywords

  • CNN-LSTM
  • Data pre-processing
  • Digital Twin
  • Discharging characteristics
  • Lithium-ion batteries (LIBs)
  • State of the health

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