DEGRADATION DIAGNOSIS METHOD OF BATTERY CELL OF VEHICLE

摘要

PURPOSE: A cell diagnostic of deterioration method of a battery for a vehicle is provided to diagnose the deterioration of a unit cell by calculating internal resistance using a current and voltage of each unit cell. CONSTITUTION: A current and voltage of each unit cell are measured(S11). Whether a state of the unit cell satisfies a condition for calculating internal resistance or not is checked(S12). The internal resistance of each unit cell is calculated by a minimum square method using the current and voltage of each unit cell(S13). An available capacity and an available output are calculated(S2). The deterioration of each unit cell is diagnosed through the available capacity and the available output which are calculated(S3A).