BATTERY DIAGNOSIS METHOD AND BATTERY TESTING APPARATUS USING SAME

A battery diagnosis method according to an embodiment of the present invention relates to a method for diagnosing a cell abnormality during charge/discharge testing for a module including a plurality of cells, wherein the battery diagnosis method may comprise the steps of: collecting battery-state-related measurement values for respective cycles of the charge/discharge testing; determining whether a voltage deviation between cells within the module among the battery-state-related measurement values is greater than or equal to a set threshold value; if the voltage deviation between cells within the module is greater than or equal to the set threshold value, calculating data representing the amount of capacity changes in the module relative to the amount of changes in a charging voltage or a discharging voltage; and identifying a trend of the data representing the amount of capacity changes in the module relative to the amount of changes in the charging voltage or the discharging voltage, so as to determine an abnormal cell within the module.