Patent ID: 8817453

Claim:
An electrical energy storage device comprising an electrode winding body, which includes a positive electrode generating electrons by oxidation and reduction, a negative electrode for absorbing the generated electrons, and separation layers for physically separating the negative electrode from the positive electrode, which are sequentially wound around a winding core, and an electrolyte provided between the positive electrode and the negative electrode, the electrical energy storage device comprising: a terminal plate for connecting the electrode winding body to an external electrode interconnecting member; a cylindrical can for accommodating the electrode winding body connected to the terminal plate; a conductive interconnecting member for connection between the terminal plate and polarity-leads on one side of the electrode winding body by a method selected from the group consisting of plasma-spraying, welding, soldering and adhesion using a conductive adhesive material; an additional interconnecting member having a size capable of being connected into the can and interposed between the interconnecting member and a plurality of toothed polarity-leads projecting from one side of the electrode winding body, wherein the thickness of the polarity-leads, the additional interconnecting member, the interconnecting member, and the terminal plate are gradually increased to increase the welding rate between the polarity-leads projecting from one side of the electrode winding body, the interconnecting member, and the terminal plate.