Ultracapacitor (Ultracapacitor), also known as electrochemical capacitor, gold capacitor, Farad capacitor; including electric double layer capacitor (EDLC) and mass capacitor (Electrochemical pseudocapacitor), store energy by polarized electrolyte. Supercapacitors are a new type of energy storage device that combines the advantages of traditional capacitors and secondary batteries. The energy storage process does not undergo chemical reactions, and the energy storage process is reversible. It is precisely because of this supercapacitor that it can be repeatedly charged and discharged for 500,000 to 1,000,000 times. It is composed of porous carbon electrode material with high specific surface area, current collector, porous separator and electrolyte. Energy storage is carried out by utilizing the electric double layer effect at the interface between the electrode material and the electrolyte.