Impact Factor:5.462

DOI number:10.1109/JESTPE.2022.3177451

Journal:IEEE Journal of Emerging and Selected Topics in Power Electronics

Key Words:Electric vehicle, state of health, linear regression, feature selection, feature elimination

Abstract:Knowing the batteries’ health state in the electric vehicles accurately and effectively would directly enhance the system’s reliability and safety. Accordingly, this paper proposes a state of health (SOH) estimation method based on the collaboration of feature selection and machine learning methods. Specifically, actual electric vehicle data from more than 1200 charging processes are analyzed to designate the constrained voltage range for data processing. Features are then derived, extracted, and selected from the capacity-based curves to depict the battery degradation process and estimate the SOH. Afterward, to find the relevant SOH estimation features, a recursive approach is utilized for pruning the unimportant features cooperated with a linear regression model. SOH estimation is therefore realized based on the above-obtained features and a low computation cost linear regressor. Six lithium-ion batteries are used to verify the proposed method. The maximum estimation error can be quantitatively limited in the range of -1% to 1% with the synergy of the model and features. Furthermore, comparative experiments demonstrate that the linear regression with optimized features could achieve a similar SOH estimation accuracy as the complicated nonlinear model but using less operating time.

Indexed by:Journal paper

Discipline:Engineering

Document Type:J

Volume:11

Issue:1

Page Number:131-142

Translation or Not:no

Date of Publication:2023-02-01

Included Journals:SCI

Links to published journals:https://ieeexplore.ieee.org/document/9780372