▎ 摘　　要

NOVELTY - The method involves arranging cells of graphene electric double layer capacitor (GEDLC) and EDLC supercapacitors in series and parallel to match energy storage capacity. The maximum 2.8 volt charging voltage of unit cells is limited, and cells are damaged by distributing the voltage evenly. A balancing circuit of the cells is connected at an electrode terminal of an output stage, and final nominal output voltages of 12 volt, 24 volt, 36 volt, and 48 volt are connected at the electrode terminal. A power switch controller is operated to boost the voltage through a boost/boost circuit. USE - Method for stabilizing output load in electric storage system using electric double layer capacitor (EDLC) cell. ADVANTAGE - The method enables maintaining and supplying constant voltage according to energy density of a battery to prevent malfunctions and extend life of the battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a graphene electric double layer capacitor cell. DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the supercapacitor. (Drawing includes non-English language text) Battery input power balancing unit (10) Voltage step-down unit (20) Voltage boosting unit (21) BMS sensor circuit unit (40) Local area network wireless fidelity module (50)