FLAT BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a flat battery reducing breakage of an electrode plate and failure caused by coming off of an active material layer in housing a flat electrode group in a battery case and enhancing discharge rate characteristics by increasing impregnation of a nonaqueous electrolyte into the flat electrode group in the flat battery in which a lower bottom surface and the side surface of the vicinity of the bottom surface of a flat electrode group comprising almost the straight line part and a curvature part in which a positive plate and a negative plate are insulated through a separator are insulated with an insulating tape and housed in a battery case with a bottom in which the upper part is opened, and the opening part of the battery case is sealed. SOLUTION: The side surface in the vicinity of at least the bottom surface of at least the straight line part of the flat electrode group is covered with an insulating tape obtained by sticking an adhesive mass on a base material. Covering of 1/10 to 8/10 of almost the straight line part is preferable. COPYRIGHT: (C)2004,JPO&NCIPI