| 摘要 |
PURPOSE:To obtain the high sealability of a flat sealed battery and prevent the battery bursting under the high pressure by using a metallic ball as sealing body of the flat sealed battery and providing a cross shaped thin part for the explosion proof in the sealing plate. CONSTITUTION:A cylindrical or taper tubelous electrolyte filler hole 12 having its tip at the inner side of a battery is provided at the center of a bottom part 5a of a battery vessel 5, and after the filling of the electrolyte, a sealing plug 13 made of a metallic ball is pressed-in the electrolyte filler hole 12. And the opening of the base end side of the electrolyte filler hole 12 is covered by a metallic sealing plate 14 in which a thin part 15 for the explosion proof is provided, and the outer peripheral part of the sealing plate 14 is welded to the bottom part 5a of the battery vessel 5. Thereby, at the time of welding of the sealing plate 14, the vaporized material of the electrolyte can not come fly to the part to be welded so that the outer peripheral part of the sealing plate 14 can be welded to the bottom part 5a of the battery vessel 5 without any hindrance. And the thin part 15 provided in the sealing plate 14 is destroyed by the pressure within the range that the safety can be secured and the battery bursting under the high pressure can be prevented. |
