Patent ID: 7332245

Claim:
The electrode for electrochemical device, comprising an electrode substrate made of a metal plate and an electrode mixture layer formed on the substrate, which comprises metal, metal oxide or metal hydroxide as active materials, wherein said metal plate has a plurality of protuberances that are alternately protruded on both front and back surfaces thereof; each of the protuberances is formed in a truncated pyramid shape in which an area of an upper bottom part thereof is smaller than that of a lower bottom part; the upper bottom part of each of the protuberances is formed with an aperture having blanking burrs blanked in a substantially pyramid shape along a direction from the upper bottom part to the lower bottom part so that an opening of the upper bottom part of each of the protuberances is formed; and said metal plate is formed in accordance with c>s≧0.1 mm 2 and 0.2≦h/d≦0.95 where c is the area of the upper bottom part of each of the protuberances, s is the area of the aperture of the upper bottom part and h is the height of the blanking burrs, said metal plate with the electrode mixture is compressed such that a thickness t of the resulting electrode after compressing is in accordance with 0.2≦t/d≦0.95 where d is the total thickness of the electrode substrate before compressing, wherein said blanking burrs have ends which extend inwardly into the interior of each of said protuberances.