Patent ID: 8865335

Claim:
An electrochemical storage cell comprising: a cathode sheet comprising active materials formed on a substrate and a metal foil current collector extending from a longitudinal edge of the cathode sheet, wherein the active materials formed on the substrate of the cathode sheet gradually thin in a direction toward corresponding edges of the substrate; an anode sheet comprising active materials formed on a substrate, and a metal foil current collector extending from a longitudinal edge of the anode sheet, wherein the active materials formed on the substrate of the anode sheet gradually thin in a direction toward corresponding edges of the substrate; a separator sheet between the cathode sheet and the anode sheet; a positive terminal; and a negative terminal; wherein the cathode sheet, separator sheet, and anode sheet are wound in a flattened coil shape to produce a core having edges in a width direction and edges in a height direction, with the metal foil current collector of the cathode sheet extending beyond the separator sheet at one end of the core and with the metal foil current collector of the anode sheet extending beyond the separator sheet at an opposite end of the core; and wherein all overlying layers of the metal foil current collector of the cathode sheet are compressed together along the corresponding edges without space between the overlying layers, and electrically connected to the positive terminal, and wherein overlying layers of the metal foil current collector of the anode sheet are compressed together along the corresponding edges without space between the overlying layers, and electrically connected to the negative terminal.