Battery, production method for battery, and mask member for production of battery

A production method for a battery, the battery including;

• an electricity-generating element;
• a housing member housing the electricity-generating element, the housing member being a bottomed tubular member having a square shape;
• a lid member being a rectangular member having a through hole, the lid member closing an open face of the housing member;
• an external terminal member protruded outward from the lid member;
• a current-collecting terminal member having a first end and a second end, the first end being provided in the housing member and connected to the electricity-generating element, the second end being cylindrical and inserted through the through hole, and the current-collecting terminal member extending outward of the lid member;
• and
• a connection member being a platy member interconnecting the current-collecting terminal member and the external terminal member outside the lid member, the connection member having an insertion hole, the second end of the current-collecting terminal member being inserted through the insertion hole, the connection member being connected to the current-collecting terminal member, the current-collecting terminal member having a swaged portion and a weld portion, the second end of the current-collecting terminal member being swaged toward the insertion hole of the connection member at the swaged portion, the weld portion being provided between an outer peripheral side end portion of the swaged second end of the current-collecting terminal member and the connection member,
• the production method for the battery comprising:
• placing a battery production-purposed mask member on the lid member, the battery production-purposed mask member having a circular hole that is larger in diameter by a predetermined amount than the swaged second end of the current-collecting terminal member, in such a placement manner that the swaged second end of the current-collecting terminal member is exposed through the circular hole;
• and
• welding the outer peripheral side end portion of the swaged second end of the current-collecting terminal member to the connection member while a portion of the lid member is covered with the battery production-purposed mask member, the portion of the lid member excluding a portion surrounding or adjacent to the swaged second end of the current-collecting terminal member.

A battery production-purposed mask member for production of a battery, the battery including:

• an electricity-generating element;
• a housing member housing the electricity-generating element, the housing member being a bottomed tubular member having a square shape;
• a lid member being a rectangular member having a through hole, the lid member closing an open face of the housing member;
• an external terminal member protruded outward from the lid member;
• a current-collecting terminal member having a first end and a second end, the first end being provided in the housing member and connected to the electricity-generating element, the second end being cylindrical and inserted through the through hole, and the current-collecting terminal member extending outward of the lid member;
• and
• a connection member being a platy member interconnecting the current-collecting terminal member and the external terminal member outside the lid member, the connection member having an insertion hole, the second end of the current-collecting terminal member being inserted through the insertion hole, the connection member being connected to the current-collecting terminal member, the current-collecting terminal member having a swaged portion and a weld portion, the second end of the current-collecting terminal member being swaged toward the insertion hole of the connection member at the swaged portion, the weld portion being provided between an outer peripheral side end portion of the swaged second end of the current-collecting terminal member and the connection member,
• the battery production-purposed mask member comprising:
• a covering member having a circular hole that is larger in diameter by a predetermined amount than the swaged second end of the current-collecting terminal member, and the battery production-purposed mask member not covering a portion surrounding or adjacent to the swaged second end of the current-collecting terminal member of the lid member and covering a portion that excludes the portion surrounding or adjacent to the swaged second end of the current-collecting terminal member of the lid member when the covering member is placed on the lid member.