JOINT ESTIMATION OF SOH AND RUL FOR LITHIUM BATTERIES BASED ON FEATURE RECONSTRUCTION AND MULTIPLE TIMES SCALES

Kou Farong; Yang Tianxiang; Luo Xi; Wang Kan; Zhou Dongming

doi:10.19912/j.0254-0096.tynxb.2024-0382

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 68-78. DOI: 10.19912/j.0254-0096.tynxb.2024-0382

Special Topics of Academic Papers at the 27th Annual Meeting of the China Association for Science and Technology

JOINT ESTIMATION OF SOH AND RUL FOR LITHIUM BATTERIES BASED ON FEATURE RECONSTRUCTION AND MULTIPLE TIMES SCALES

Kou Farong, Yang Tianxiang, Luo Xi, Wang Kan, Zhou Dongming

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Abstract

A joint estimation method of SOH and RUL based on feature reconstruction and multiple time scales is proposed in this paper. Firstly, six health features related to capacity degradation are extracted from the lithium battery aging data set, and the feature data is reconstructed by using variational mode decomposition algorithm. The feature reconstruction was achieved by filtering the participating modes through user-defined indicators; On this basis, the Bayesian algorithm is used to optimize the convolutional long-term and short-term memory network to construct the SOH estimation model. The accurate and efficient estimation of SOH and RUL is achieved by combining the algorithm iteration at the micro scale with the convolutional neural network model at the macro scale. The results show that the estimation error of SOH is stable within 1%, and the estimation accuracy is about 35% higher than that before feature reconstruction; The mean absolute error （MAE） and root mean square error（RMSE） of RUL prediction results are kept within 0.42 and 0.78, respectively, which realizes the high-precision estimation of SOH and RUL.

Key words

lithium battery / long-term and short-term memory network / modal decomposition / multiple time scales / joint estimation / clean energy

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Kou Farong, Yang Tianxiang, Luo Xi, Wang Kan, Zhou Dongming. JOINT ESTIMATION OF SOH AND RUL FOR LITHIUM BATTERIES BASED ON FEATURE RECONSTRUCTION AND MULTIPLE TIMES SCALES[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 68-78 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0382

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