| 摘要 |
PURPOSE:To obtain a flat-type battery having a stable high discharge amount while improving the electrochemical insulating property of a coated film by making the part to be sectionally convex of the part to be covered with a coating agent of a pole can into the obtuse or R-shape. CONSTITUTION:An negative pole can 1 consists of a bottomed part 1a and a cylindrical riser part 1b vertically rising from the periphery of said bottomed part 1a while coating the surface of the riser part 1b with a coating film 1d of the fluoric system. The angular parts 1e, 1f, 1g and 1h to become convex in said riser part 1b are provided with the chamfering parts 6e, 6f, 6g and 6h respectively while making the angle of the part to become sectionally convex to be obtuse larger than 90 deg.. Thereby, the coating film 1d at the angular parts 1e, 1f, 1g and 1h is prevented from being thinned and cracked while improving the electrochemical property for preventing an internal short circuit thus removing a drop in the discharge capacity. The same effect can be obtained also by making the angular parts 1e, 1f, 1g and 1h to be R-shaped respectively while being rounded. |
