BATTERY CELL DIAGNOSTIC DEVICE AND METHOD

The present invention relates to an apparatus and a method for diagnosing an increase in the resistance of a battery cell lead part, and a method for diagnosing a battery cell, according to one embodiment of the present invention, comprises: a first voltage measuring step of measuring the voltage of each unit cell of a battery pack when the battery pack is in an open circuit voltage state; a second voltage measuring step of measuring the voltage for each unit cell according to a predetermined current flowing in the battery pack when the battery pack is in a charged state or discharged state; and a step of detecting whether the unit cell is abnormal by comparing the voltage measured in the first voltage measuring step with the voltage measured in the second voltage measuring step for each unit cell.