Patent ID: 8518573

Claim:
An energy-storage electrode core, adapted for use in an energy-storage device, comprising: a first current-collector foil element having a first side and a second side, comprising: a first plurality of carbon-electrode elements disposed on said first side of said first current-collector foil element, wherein said first plurality of carbon-electrode elements define a first plurality of fold-zone regions defined between a first plurality of fold-zone demarcation regions, and a second plurality of carbon-electrode elements disposed on said second side of said first current-collector foil element, wherein said second plurality of carbon-electrode elements define a second plurality of fold-zone regions defined between a first plurality of fold zone demarcation regions; a second current-collector foil element having a first side and a second side, comprising: a third plurality of carbon-electrode elements disposed on said first side of said second current-collector foil element, wherein said third plurality of carbon-electrode elements define a third plurality of fold-zone regions defined between a second plurality of fold zone demarcation regions, and a fourth plurality of carbon-electrode elements disposed on said second side of said second current-collector foil element, wherein said fourth plurality of carbon-electrode elements define a fourth plurality of fold-zone regions defined between a second plurality of fold zone demarcation regions; a separator element, having a front side and a back side, wherein the front side of said separator element is affixed to said second side of said first current-collector foil element, wherein the back side of said separator element is affixed to said first side of said second current-collector foil element, and wherein said separator element prevents said first current-collector foil element from electronically shorting to said second current-collector foil element, while still allowing ionic current flow therebetween; and a center axis about which said fold-zones of said current-collector foil elements are circumferentially collapsed, wherein folded electrode elements are disposed in a substantially annular form, forming substantially a single loop of radial electrode folds, and wherein said pluralities of fold-zone demarcation regions are approximately laterally and co-axially aligned with respect to said first and second current-collector foils.