| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding method by which fatigue limit at a welded portion between a battery case can and a lid can be increased, and an electricity storage device.SOLUTION: A welding method for welding a battery case can 11 and a lid 12 constituting a case 10 of a secondary battery 100 includes: a flux coating step of applying a flux 17a into a gap between the battery case can 11 and the lid 12, at a boundary 13 between the battery case can 11 and the lid 12; and a welding step of welding and joining the battery case can 11 and the lid 12, at the boundary 13. |
