Conditional Diffusion Modeling with Attention for Probabilistic Battery Capacity Prediction under Real-World Condition

TL;DR

This paper introduces CDUA, a diffusion-based deep learning model with attention mechanisms, for accurate battery capacity prediction and uncertainty quantification using real-world vehicle data.

Contribution

It presents a novel Conditional Diffusion U-Net with Attention (CDUA) model that integrates feature selection and deep generative modeling for probabilistic battery capacity forecasting.

Findings

Achieves a relative MAE of 0.94% and RMSE of 1.14% on real-world data.

Provides reliable uncertainty quantification with a 95% confidence interval of 3.74%.

Outperforms existing approaches in robustness and accuracy.

Abstract

Accurate prediction of lithium-ion battery capacity and its associated uncertainty is essential for reliable battery management but remains challenging due to the stochastic nature of aging. This paper presents a new method, termed the Conditional Diffusion U-Net with Attention (CDUA), which integrates feature engineering and deep learning to address this challenge. The proposed approach employs a diffusion-based generative model for time-series forecasting and incorporates attention mechanisms to enhance predictive performance. Battery capacity is first derived from real-world vehicle operation data. The most relevant features are then identified using the Pearson correlation coefficient and the XGBoost algorithm. These features are used to train the CDUA model, which comprises two components: (1) a contextual U-Net with self-attention to capture complex temporal dependencies, and (2) a noise predictor network that learns to estimate the added noise, enabling the reconstruction of accurate capacity values from noisy observations. Experimental validation on the real-world vehicle data demonstrates that the proposed CDUA model achieves a relative mean absolute error of 0.94% and a relative root mean square error of 1.14%, with a narrow 95% confidence interval of 3.74% in relative width. These results confirm that CDUA provides both accurate capacity estimation and reliable uncertainty quantification. Comparative experiments further verify its robustness and superior performance over existing mainstream approaches.