Automated feature extraction and selection for data-driven models of rapid battery capacity fade and end of life

Abstract

Lithium-ion cells may experience rapid degradation in later life, especially with more extreme usage protocols. The onset of rapid degradation is called the `knee point', and forecasting it is important for the safe and economically viable use for batteries. We propose a data-driven method that uses automated feature selection to produce inputs for a Gaussian process regression model that estimates changes in battery health, from which the entire capacity fade trajectory, knee point and end of life may be predicted. The feature selection procedure flexibly adapts to varying inputs and prioritises those that impact degradation. For the datasets considered, it was found that calendar time and time spent in specific voltage regions had a strong impact on degradation rate. The approach produced median root mean square errors on capacity estimates under 1\%, and also produced median knee point and end of life prediction errors of 2.6\% and 1.3\% respectively.

References in corpus (4)

• Gaussian process regression for forecasting battery state of health
• Battery health prediction under generalized conditions using a Gaussian process transition model
• Data-driven nonparametric Li-ion battery ageing model aiming at learning from real operation data -- Part B: Cycling operation
• Data-driven nonparametric Li-ion battery ageing model aiming at learning from real operation data -- Part A: Storage operation

Cited by in corpus (7)

• "Knees" in lithium-ion battery aging trajectories
• Predicting Battery Lifetime Under Varying Usage Conditions from Early Aging Data
• Systematic Feature Design for Cycle Life Prediction of Lithium-Ion Batteries During Formation
• Battery Capacity Knee-Onset Identification and Early Prediction Using Degradation Curvature
• Cycle Life Prediction for Lithium-ion Batteries: Machine Learning and More
• Learning battery model parameter dynamics from data with recursive Gaussian process regression
• A Transferable Physics-Informed Framework for Battery Degradation Diagnosis, Knee-Onset Detection and Knee Prediction