Estimation of the state of health (SOH) of batteries using discrete curvature feature extraction

Hui, Hwang Goh and Lan, Zhentao and Zhang, Dongdong and Wei Dai, Wei Dai and Kurniawan, Tonni Agustiono and Kai, Chen Goh (2022) Estimation of the state of health (SOH) of batteries using discrete curvature feature extraction. Journal of Energy Storage, 50. pp. 1-15.

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Abstract

Lithium battery applications in a variety of engineering sectors must be safe and reliable while maintaining a high level of energy efficiency. An accurate assessment of the battery's state of health (SOH) is critical in battery management systems (BMS). In recent years, it has been proved that machine learning is effective at estimating SOH. This work proposes a novel approach of health indicator (HI) extraction based on the U-chord curvature model, based on a complete analysis of battery aging data. In contrast to previous approaches for feature extraction, our method splits the discharge process into various phases based on the curvature of the discharge curve and extracts many HIs with a high correlation to battery SOH in the discharge platform stage of the discharge curve. To demonstrate the superiority of the proposed model, several well-known machine learning algorithms are employed to estimate SOH using extracted attributes. Long short-term memory (LSTM) and artificial neural networks (ANNs) are examples of these techniques. Accuracy, reliability, and robustness of the proposed model are evaluated using three publicly available data sets. According to the data, the model appears to be capable of accurately calculating the battery's SOH, with a mean absolute error of less than 1.08% and a root mean square error of less than 1.46% for various battery types.

Item Type:	Article
Uncontrolled Keywords:	Lithium-ion batteries; state of health; feature extraction; u-chord curvature; machine learning
Subjects:	T Technology > T Technology (General)
Depositing User:	Mr. Abdul Rahim Mat Radzuan
Date Deposited:	21 Jul 2022 07:21
Last Modified:	21 Jul 2022 07:21
URI:	http://eprints.uthm.edu.my/id/eprint/7421

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