Full
Outline
The state-of-health (SOH) and remaining useful life (RUL) of batteries are important indicators for measuring their performance and conditions, and an accurate prediction of these indicators has high practical value. The electrochemical impedance spectroscopy (EIS) test of batteries can reveal the electrochemical reactions and processes inside them, providing important information for evaluating their SOH. EIS can be used to predict SOH and RUL, but it has high testing costs and limited data volume. The use of variational autoencoder (VAE) for data augmentation can expand the volume of EIS data, which helps improve the model’s generalization capability and reduce the risk of overfitting. Due to the fact that the EIS data is usually high-dimensional and may contain redundant information, principal component analysis (PCA) can be used to reduce the dimensionality of data while retaining the key information. Convolutional neural network (CNN) can recognize the spatial features in the EIS data, while bidirectional long short-term memory (BiLSTM) network can capture features within the time series data. The Attention mechanism can enhance the model’s understanding of data contextual relationships. The research results indicate that the model combining PCA, CNN, BiLSTM network and Attention mechanism can more effectively predict the SOH and RUL of batteries with the addition of augmented data. The proposed EIS data augmentation method can also be applied to other models to improve the predictive performance.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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