A Hybrid Method with Serial and Parallel Charging Technologies for Balanced Charging of EV Batteries

摘要

The present invention relates to a uniform charging technology in which a parallel individual charging structure is added to a serial charging structure in order to solve the problem of uneven charging between cell voltages in a serial batch charging method of a battery cell for an electric vehicle. More specifically, the technology is a serial and parallel charging technology for additionally adopting the parallel charging structure in the serial charging structure and controlling a charging speed individually for each cell for uniform charging between cells. For the parallel charging structure to be added to the serial charging structure, a voltage of a small size is rectified and applied to each battery cell individually in parallel through a DC-DC- conversion circuit such that each batter cell is charged. Therefore, the voltage of the whole battery cell summed in series becomes a charging target voltage.