Cylindrical electrochemical cells and method of manufacture

An electrochemical storage cell, comprising:

• a core;
• a first electrode sheet and a second electrode sheet;
• the first and second electrode sheets wound around the core in the form of a jellyroll structure;
• wherein the first and second electrode sheets each comprise uncoated conductive edges parallel to end faces of the jellyroll structure and coated opposing surfaces between the uncoated conductive edges;
• a first separator sheet and a second separator sheet, wherein the first and second separator sheets mechanically and electrically separate the coated opposing surfaces of the first and second electrode sheets and mechanically and electrically separate the core and the coated opposing surfaces of the first electrode sheet;
• and
• wherein the uncoated conductive edges of the first and second electrode sheets comprise slotted cutouts, the slotted cutouts angularly co-located relative to the core.

An electrochemical storage cell, comprising:

• a first electrode sheet and a second electrode sheet;
• the first and second electrode sheets wound around a cylindrical core forming a jellyroll structure;
• wherein the first and second electrode sheets each comprise uncoated edges parallel to end faces of the jellyroll structure and coated opposing surfaces between the uncoated conductive edges;
• a first separator sheet and a second separator sheet, wherein the first and second separator sheets mechanically and electrically separate the coated opposing surfaces of the first and second electrode sheets and mechanically and electrically separate the cylindrical core and the coated opposing surfaces of the first electrode sheet;
• slotted cutouts from the uncoated conductive edges, the slotted cutouts angularly co-located relative to the cylindrical core upon forming the jellyroll structure;
• compressing angularly co-located portions of the uncoated conductive edges;
• wherein the angularly co-located portions are electrically connected to each other;
• wherein the angularly co-located portions are adjacent to the slotted cutouts;
• wherein the cylindrical core comprises a pair of flat opposing sides, the pair of flat opposing sides forming a flattened ovular cross-section;
• and
• wherein the angularly co-located portions are electrically connected to the cylindrical core at the flat opposing sides.