Patent ID: 8098481

Claim:
An energy storage device comprising: a first electrode capable of storing an electrical charge, a second electrode capable of storing an opposite electrical charge, and a dielectric separator therebetween, the first and the second electrodes being in film form; a first collector sheet supporting the first electrode, a second collector sheet supporting the second electrode, each of the first and second collector sheets being electrically conductive, the combination of the first electrode with the first collector sheet, of the dielectric separator, and of the second electrode with the second collector sheet being spirally wound together, a free end of the first collector sheet extending from one edge of the spiral winding and a free end of the second collector sheet extending from the opposite edge of the spiral winding; a container adapted to house the spiral winding, the container comprising an electrically conductive base and one or more walls defining an opening, the spiral winding being housed in the container so to have the free end of the first collector sheet contacting the base and the free end of the second collector sheet oriented towards the opening; an electrolyte in ionic contact with the first and second electrodes; a collector plate shaped to contact the free end of the second collector sheet at one side and oriented towards the opening at the opposite side, the collector plate being interposed between the free end of the second collector sheet and the opening, the collector plate being restrained in position by an inward protrusion of a crimp in the one or more container walls, the inward protrusion of the crimp being between the collector plate and the spiral winding, the collector plate being electrically isolated from the one or more container walls; the crimp extending upward from the inward protrusion, a lid positioned in the opening on the side of the crimp opposite to the collector plate, the lid having a side in electrical contact with the collector plate and an opposite side oriented outwardly of the container, the lid being restrained in position by rolling the one or more container walls at the other side of the crimp over the side of the lid opposite to the collector plate and being electrically isolated from the one or more container walls; and a first terminal post extending from the lid, the electric terminal being structured to carry current from the second electrode and being shaped for attachment to an external load.