Reconfigurable Battery System-Based Hybrid Self-Heating Method for Low Temperature Applications

Battery performance is significantly reduced at low temperatures, posing a challenge. To overcome this issue, the reconfigurable battery system (RBS) based hybrid self-heating (HSH) method is proposed in this article. This innovative approach leverages the flexible mode-switching characteristics of the RBS, achieving HSH with a high temperature rise rate and minimal energy loss. Additionally, employing square ac heating current with high frequency and low amplitude further mitigates damage to the battery. The physical configuration of the RBS- based HSH method is designed, and the modularized three-switch reconfigurable topology is proposed. Furthermore, the heating strategy is developed to further reduce battery fading. The experimental results demonstrate the efficient heating capability of this approach: the battery can be rapidly heated from -20 degrees C to 10 degrees C in just 239 s, consuming only 6.29% of the nominal capacity.