| 摘要 |
PROBLEM TO BE SOLVED: To enhance productivity by sealing a concave container more reliably with a sealing plate.SOLUTION: A ramp 3b larger than a concave container 2 is formed partially or entirely on the outer periphery of a sealing plate 3. Positioning is facilitated when setting the sealing plate 3 in the concave container 2 before welding, by inclining the ramp 3b to the concave container 2 side. Furthermore, positional deviation can be prevented, even if the sealing plate 3 is brought into a state floating from the concave container 2 by electrodes 5, 6 or a separator 7. |
