Embodiments of the present application provide a battery cell, a battery, and an electrical device. The battery cell comprises: a case with an opening; an electrode assembly accommodated within the case; and an end cover closing the opening, wherein the en...

A tip plug 56 is capped on a boss section 55a so as to fit to a hole 55 which is used for detaching a core which is formed in a blade tip section 52 of the gas turbine blade. A butt-section T is melted so as to form a butt-welding section 57 by using a YAG...