| 摘要 |
PROBLEM TO BE SOLVED: To provide a closed container capable of easily increasing compressive strength and airtightness, and a method of manufacturing the same.SOLUTION: A case 11 for a secondary battery 10 has an opening S of a metal case body 13 closed with a metal lid body 14. The case 11 has two annular weld zones, that is to say, outside and inside weld zones 42 and 41 by welding from its outside. In a mating part 40, the inside weld zone 41 is positioned inside the case 11 with respect to the outside weld zone 42. |
