Shared Representation Learning for Generalizable SOH Estimation Across Multiple Battery Configurations

Battery health monitoring is essential in applications such as electric vehicles and energy storage systems, where the lifespan and health state of batteries directly impact the safety and operational costs. However, existing works have demonstrated promising performance in predicting the state of health (SOH) of batteries within the same type under certain working conditions. However, batteries are produced with different types and work under different conditions in real applications. Existing methods fail to leverage the inherent correlations between related battery types and overlook the various working conditions, resulting in suboptimal robustness and prediction accuracy. To address this limitation, we propose SRSE: a novel Shared Representation learning framework that jointly learns shared representation (hidden knowledge) across multiple battery configurations for robust and generalized SOH Estimation. In particular, an adversarial training scheme is utilized to eliminate task-specific contamination in the shared feature space. SRSE captures both feature-level and logit-level shared knowledge and subsequently transfers it from the shared layer to task-specific layers, enhancing the adaptability and efficiency of each task. Extensive experiments on three large-scale battery health datasets demonstrate that our proposed method significantly improves SOH estimation performance across diverse battery types and operating conditions.