Multiphysics Feature-Based State-of-Energy Estimation for LiFePO4 Batteries Using Bidirectional Long Short-Term Memory and Particle Swarm-Optimized Kalman Filter. - Wu, Zhengpu; He, Xu; Chen, Haisen; Lv, Lu; Jiang, Jiuchun; Wang, Lujun (Applied Sciences (2076-3417), 2025)