Patent ID: 6881514

Claim:
A method for preparing electrochemical element which is stacked with a full cell as a basic unit, comprising: (a) preparing a full cell placed in the inner side, wherein the full cell comprises a cathode coated with cathodic materials on both sides of a cathode current collector, a separator layer and an anode coated with anodic materials on both sides of an anode current collector sequentially; (b) preparing a full cell placed in the outermost side, wherein the full cell comprises (i) a cathode coated with cathodic materials on a single side of a cathode current collector, a separator layer and an anode coated with anodic materials on both sides of an anode current collector sequentially or (ii) an anode coated with anodic materials on a single side of an anode current collector, a separator layer and a cathode coated with cathodic materials on both sides of a cathode current collector sequentially, and wherein the outermost side of the full cell is a current collector foil; and (c) laminating at least one full cell placed in the inner side of (a), two full cells placed in the outermost side of (b) and at least two separator films between each full cell.