Electric double layer capacitor and an assembled cell type power source device

摘要

An electric double layer capacitor used as a unit capacitor for forming an assembled cell type power source device by connecting a plurality of capacitor elements in series, wherein each of the capacitor elements is formed by impregnating an electrolyte in at least one pair of polarization electrode sheets between which a separator is inserted, wherein a protective circuit in which a Zener diode each having an operation resistance of 10-150 OMEGA at the average operation voltage of the electric double layer capacitor are connected in parallel to each of the electric double layer capacitors.