Integrated carbon/carbon ultracapacitor of high power density and battery composed from said capacitors

An integrated carbon/carbon ultracapacitor of high energy density comprising a cylindrical housing having a bottom and the housing being closed in the opposite end by an end cap, which is integrated with a first current terminal, wherein the first current terminal having a through hole for filling ultracapacitor with an electrolyte, a seal for isolating electrically the end cap from the cylindrical housing of the ultracapacitor, a double-layer carbon electrode placed into the cylindrical housing, and a second current terminal, wherein the bottom of the cylindrical housing is an opening through which protrudes out from the cylindrical housing a terminal end of the second current terminal which is welded to the bottom of the housing along a perimeter of the opening outside of the housing, and the end cap has an opening for guiding out a terminal end of the first current terminal protruding from the capacitor and the end cap and a terminal end of the first current terminal is welded together along the perimeter of the opening of the end cap.