APPARATUS FOR DIAGNOSING ABNORMALITY OF A BATTERY CELL GROUP AND METHOD FOR THE SAME

An apparatus for diagnosing abnormality of a battery cell group and a method for the same are provided. The apparatus includes a voltage sensor to measure a voltage value with respect to each battery cell group including a plurality of battery cells connected to each other in parallel, and a controller to determine an accumulated voltage value for an effective time with respect to each battery cell group, determine a representative value for each battery cell group by removing an offset from each accumulated voltage value, and detect a battery cell group having abnormality, based on an average value and a standard deviation of representative values.