A Correlation-Augmented Informer-Based Method for State-of-Health Estimation of Li-Ion Batteries

Accurate estimation of the state of health (SOH) of lithium-ion batteries is crucial to ensure their safe and reliable use. To address the issue of neglecting correlations between different charge/discharge cycles in current neural network (NN)-based methods, this article introduces a correlation-augmented informer network. Specifically, the multiple correlation coefficient (MCC) is used to analyze the correlation between different cycles, and then a correlation-augmented informer containing embedding, encoder, and decoder is constructed. To emphasize cycles with stronger correlations during the estimation process, we incorporate multihead local self-attention mechanisms. We validate our approach on two publicly available datasets using mean absolute error (MAE), mean absolute percentage error (MAPE), and root-mean-square error (RMSE), which are 0.2%, 0.3%, and 0.2% on the MIT dataset and 1.0%, 1.4%, and 1.8% on the CALCE dataset, respectively. These results demonstrate the superior accuracy and robustness of the proposed method in comparison to existing state-of-the-art NN methods.