Patent attributes
A battery pack is provided that includes a plurality of battery cells, a detection portion, a plurality of discharge circuits, and a controller. The plurality of battery cells are connected in series with each other. The detection portion detects a cell voltage between both ends of each battery cell. The plurality of discharge circuits respectively discharge the battery cells. The controller controls the discharge circuits based on the cell voltage detected by the detection portion. The controller controls the discharge circuit to discharge at least one first battery cell when a cell voltage equal to or greater than a first threshold value is detected in the first battery cell and discharge at least one second battery cell when a cell voltage equal to or greater than a second threshold value smaller than the first threshold is detected in the second battery cell other than the first battery cell.
