As a core energy component in many fields, accurate prediction of state of health(SOH) is crucial for lithium-ion battery during their lifecycle. A hybrid prediction method based on Neural Basis Expansion Analysis(N-BEATS) and relevance vector machine(RVM) was proposed. Firstly, variational mode decomposition was used to decompose the original time series to improve the accuracy of prediction; Secondly, the decomposed subsequence was divided into high-frequency and low-frequency subsequences based on the center frequency, and the deep neural network N-BEATS model with residual principle and RVM model were used to model and predict them respectively; Finally, the prediction results of each subsequence were overlaid and reconstructed to obtain the final prediction results. To verify the effectiveness of the proposed method, this paper conducted simulation experiments using lithium-ion battery data provided by NASA and CALCE. The experimental results show that compared with the single N-BEATS model and the RVM model, the proposed hybrid method can effectively combine the advantages of the two models and demonstrate higher prediction accuracy. Furthermore, compared with the long short-term memory network, Gaussian process regression, and support vector regression models, the root mean square error of the proposed method is reduced by about 96.5%, 74.5%, and 62.5%, and the mean square error is reduced by 97.3%, 76.7%, and 58.8%, respectively.
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