Battery module active balancing-low temperature self-heating integrated topology and control

In order to address the limitations of traditional battery module balancing and low-temperature self-heating systems, which are often associated with complex topologies and low energy efficiency, a novel integrated topology that combines both functions is proposed in this study. Coordinated control strategies are developed to enhance the synergy between active balancing and self-heating. Simulation results show that increasing the PWM signal period significantly improves both the balancing and self-heating rates, while simultaneous adjustment of inductance and period has limited impact. The proposed active balancing strategy enables the Buck-Boost converter to operate in intermittent current mode, achieving rapid state-of-charge equalization across series-connected cells. In addition, the variable-period self-heating strategy outperforms constant-period approaches in heating efficiency, and a higher limiting voltage further accelerates the heating process. These findings demonstrate the potential of the proposed approach to achieve efficient and compact electro-thermal energy management for battery modules operating in cold climate conditions.