Battery and method for manufacturing same

12, A method of manufacturing a battery, the battery including:

• an electrode body which has a positive electrode and a negative electrode;
• an outer package which has an opening and which houses the electrode body;
• a sealing plate which seals the opening of the outer package and which has a through-hole and a recessed portion provided around the through-hole on a surface an a side opposing the electrode body;
• and a sealing member which seals the through-hole of the sealing plate,
• the sealing member having an inserted portion having been inserted to the through-hole and an enlarged diameter portion which extends from the inserted portion to inside of the outer package and which is formed with a larger diameter than the inserted portion, and
• at least a part of the enlarged diameter portion being arranged inside the recessed portion of the sealing plate,
• the method of manufacturing a battery comprising the steps of:
• forming the enlarged diameter portion by inserting the sealing member into the through-hole from the outside of the outer package and causing a tip of the sealing member to deform;
• and
• after forming the enlarged diameter portion, confirming whether or not the enlarged diameter portion has a predetermined shape by emitting X-rays.

The method of manufacturing a battery according to claim 12, wherein

• the sealing plate has an approximately rectangular shape.
• the enlarged diameter portion has a maximum width portion with a maximum width in a longitudinal direction of the sealing plate,
• when a cross section X1 represents a cross section which is perpendicular to the sealing plate, which extends in a short direction of the sealing plate, and which passes an end in the longitudinal direction of the maximum width portion and
• a cross section X2 represents a cross section which is perpendicular to the sealing plate, which extends in a short direction of the sealing plate, and which passes another end in the longitudinal direction of the maximum width portion,
• the cross section X1 and the cross section X2 have a straight line A which passes the maximum width portion and which does not intersect with the electrode body, and
• in the confirming step, the X-rays are emitted along the straight line A.