METHOD OF BALANCING CELL IN BATTERY PACK OF HEV

摘要

PURPOSE: A cell balancing method of a battery pack for a hybrid vehicle is provided to minimize voltage deviation between cells inside a battery pack by performing the cell balancing until the measured voltage deviation between the cells is a value obtained by subtracting the preset size from the fixed size. CONSTITUTION: A cell voltage is measured by determining a key on state(S100). The cell voltage is measured by determining whether the current is a constant valve or less for one minute or more(S110). It is determined whether the voltage deviation between the cells is a preset size or more(S120). It is determined whether the fault is not generated and the state of charge is above 20%(S130). The corresponding cell is discharged by the cell balancing if the voltage deviation between the cells is above the preset size based on the minimum voltage cell(S140). The cell balancing is released by determining whether the voltage deviation between cells is the value obtained by subtracting the preset size from the fixed size(S150).