| 摘要 |
PURPOSE:To prevent dividing a negative pole into sections, a drop in terminal voltage, the drop in voltage and deterioration in the battery capacity while checking an internal short-cut by forming a part not facing a belt-shaped positive pole along the side peripheral part of a belt-shaped negative pole while providing a collector on a part of the negative pole. CONSTITUTION:Lithium is used as an active material for a belt-shaped negative pole 2, while a collector such as an expanded metal and wire gauze is pressed to one part, for instance, to one side end part of said negative pole 2. Belt- shaped positive poles 5 of manganese dioxide, carbon fluoride and copper fluoride are provided in layers on said belt-shaped negative pole 2 through separators 4 such as polypropylene unwoven cloth. Thereby, the width of the positive pole 5 is made smaller than the width of the negative pole 2, for instance, when matching its upper periphery with the upper periphery of the negative pole 2, a part not facing the positive pole 5 is made to be formed along the lower peripheral part 2a on the side of the negative pole 2. Further, the same separators are piled up on the positive poles 5 while winding them round for constituting a spiral electrode group 1. |
