ELECTRICITY STORAGE ELEMENT PRODUCTION METHOD AND ELECTRICITY STORAGE ELEMENT PRODUCTION DEVICE

摘要

This production method for an electricity storage element (500) where welding is carried out on a container (510) of the electricity storage element (500) comprises: a positioning step (S10) of positioning between two weld sections at which welding is to be carried out, a tool (300) having wall surfaces (A11, A12) formed thereon; and a welding step (S20) of carrying out welding at the two weld sections while supplying a shielding gas to the two weld sections from two different directions respectively facing the two weld sections.