Battery unit element cell equalizing charge controller

The invention discloses a battery unit element cell equalizing charge controller. A buck-boost circuit mainly serves as a core, wherein the buck-boost circuit is composed of an inductor energy storage element, a capacitor energy storage element, two power metal-oxide-semiconductor field effect transistors (MOSFETs) and two schottky diodes. In the circuit of the equalizing charge device, the inductor energy storage element and the capacitor energy storage element form a typical second order oscillation circuit, the buck-boost circuit which is composed of the MOSFETs and the two schottky diodes is utilized, and energy transfer among element cells which are small in power source voltage differences can be rapidly and conveniently achieved. The equalizing charge device is controlled by a program of a digital signal processor so that energy-storage capacitor precharge, itinerant checking and storage of the cell elements of a battery unit, transferring of energy from high-capacity element cells to low-capacity elem