METHOD FOR DETECTING CELL STATE-OF-CHARGE AND STATE-OF-DISCHARGE DIVERGENCE OF SERIES STRING OF BATTERIES OR CAPACITORS

摘要

PROBLEM TO BE SOLVED: To provide control circuitry for appropriately charging lithium ion cells arranged in series.SOLUTION: A system for charging a battery includes a battery pack having at least two lithium ion cells. A controller detects a rate of change of voltage with respect to a state of charge (dV/dSOC) of the battery pack on the basis of calculated dV/dSOC that represents the battery pack as a whole, without calculating dV/dSOC individually on a cell-by-cell basis. Charging is terminated when dV/dSOC reaches a predetermined value.