Patent ID: 8010010
Filing Date: 2011-08-30
Classification: G03G

Abstract:
1. An energy storage device that is used in an apparatus, the energy storage device comprising: a plurality of capacitor cells of a first type having a first internal resistance; a plurality of capacitor cells of a second type having a second internal resistance which is higher than the first internal resistance; a detection unit that detects a voltage value between two opposing ends of at least one of the capacitor cells of the first type or at least one of the capacitor cells of the second type; and a control unit that controls discharge operations of said at least one of the capacitor cells of the first type or said at least one of the capacitor cells of the second type when the voltage value detected by the detection unit is greater than a predetermined threshold value, wherein: the capacitor cells of the first type are serially connected to form a first capacitor module, the capacitor cells of the second type are serially connected to form a second capacitor module, and the first capacitor module and the second capacitor module are connected in parallel.