Battery Dynamic Equalization During Self-Heating in EV Packs

The patent implements dynamic equalization by making the equalization current adaptive and variable during self-heating. The control system continuously adjusts the equalization current based on real-time voltage differences between battery packs, transitioning from static to dynamic control. This allows the system to maintain equalization effectiveness while the batteries are being heated, resolving the contradiction between temperature increase and equalization maintenance.

The patent employs feedback control by continuously monitoring the voltage differences between first and second battery packs during self-heating. The control system uses this feedback information to dynamically adjust the equalization current, creating a closed-loop control mechanism. This feedback approach ensures that equalization is actively maintained despite the changing thermal conditions, solving the contradiction between heating and equalization.

The patent achieves multi-functionality by enabling the motor controller to perform both self-heating and equalization functions simultaneously. The same control system and power electronics are used for both heating operations and equalization operations, eliminating the need for separate dedicated equalization hardware. This universal approach improves equalization during self-heating without proportionally increasing device complexity.

The patent merges the self-heating function and equalization function into a unified control process. By combining these two functions that were previously separate, the system achieves equalization during self-heating using the existing control infrastructure, thereby improving reliability without significant increases in device complexity.

The patent applies preliminary anti-action by implementing equalization measures before voltage differences can cause significant capacity reduction or lifespan shortening. The control system proactively monitors and corrects voltage imbalances during self-heating, preventing the accumulation of harmful voltage differences that would otherwise lead to capacity loss and reduced battery life.

The patent converts the harmful effect of voltage differences into a beneficial outcome by using the self-heating process itself as the mechanism for equalization. The same electrical currents that cause heating are also used to perform equalization, turning what would normally be a harmful condition into a useful opportunity for maintaining battery health and extending lifespan.