Electrochemical cell having wound electrode structures

Claim 1

An electrochemical cell comprised of: a metal case having a cylindrical wall and a flat bottom; a metal cover in contact with the wall of said metal case; a terminal extending through the center of said cover and electrically insulated therefrom; a first electrode structure including a first elongated metal substrate having a first edge and a second edge extending along its length, a first end, and a second end; a first electrode material covering both sides of said first substrate except for bare borders adjacent to said first and second edges of said first substrate and a bare end extending from said first end; a second electrode structure including a second elongated metal substrate generally covered with a second electrode material; an insulating porous sheet interposed between said first electrode structure and said second electrode structure; said first electrode structure, said insulating porous sheet and said second electrode structure wound in a coil with said bare end of said first substrate on the outside of said coil; said first substrate having a width greater than said second substrate; said coil arranged within said case with one edge of said first substrate in electrical contact with said flat bottom and the other edge of said first substrate in electrical contact with said cover; said bare end of said first substrate in contact with said wall; conducting means for providing electrical communication between said first electrode structure and said terminal; and an electrolytic solution substantially immersing said coil.