Patent ID: 7087345
Filing Date: 2006-08-08
Classification: H01M,Y02E,Y02P

Abstract:
1. Spirally-rolled electrodes for batteries comprising a concentric circle shape or an elliptic shape with a thin nickel positive electrode and a thin metal hydride negative electrode which are wound spirally interposing a separator therebetween has the characteristics as below: (1) said thin nickel positive electrode is the electrode around which plural positive electrode plates are wound in series in order; (2) said thin metal hydride negative electrode is the electrode around which one or plural negative electrodes are wound in series in order; (3) plural electrode plates in each electrode are so combined that the total amount of the active material or pseudo-active material is substantially constant; (4) plural electrode plates in each electrode are wound in series with an interval therebetween and; (5) the thickness of an electrode at the side where the winding starts is thinner than the thickness of an electrode at the side where the winding ends in several electrode plates in an electrode comprising several electrode plates.