BATTERY MANAGEMENT SYSTEM AND METHOD FOR EXTENDING BATTERY LIFETIME

A battery management system and method for extending battery lifetime is provided. In a test mode, the battery management system controls a charging frequency of a battery cell according to a plurality of pulse wave modulation signals respectively within a plurality of time intervals. The battery management system monitors impedances of the battery cell respectively within the plurality of time intervals or a plurality of capacitance ranges. The battery management system compares the impedances with each other to select one of the impedances, and sets a frequency of the pulse wave modulation signal that is outputted for controlling the charging frequency of the battery cell such that the battery cell has the selected impedance, as a practical frequency in a practical use mode. As a result, an increase in the impedance of the battery cell is delayed so as to extend lifetime of the battery cell.