ABNORMAL CELL DETECTION METHOD, ABNORMAL CELL DETECTION DEVICE, AND BATTERY PACK

An abnormal cell detection method of a battery pack including a plurality of cells, the method including obtaining a first plurality of discharge rates for each cell during a first rest period in a cell balancing state, prohibiting a cell balancing of the plurality of cells if a first cell having a first discharge rate greater than or equal to a first threshold value is detected, obtaining a second plurality of discharge rates during a second rest period for each of the plurality of cells in a cell balancing prohibition state, and detecting an abnormal cell having a second discharge rate greater than or equal to a second threshold value.