Battery unit, method of manufacturing battery unit, electronic equipment, electric tool, and electric vehicle

A method of manufacturing a battery unit, the method comprising:

• disposing a first insulating film at least on a side of a first major surface of an electrically conductive member including the first major surface and a second major surface, the first insulating film having an opening;
• disposing a second insulating film at least on a side of the second major surface of the electrically conductive member;
• thermal-fusion-bonding the first insulating film and the second insulating film to each other with the electrically conductive member being exposed through the opening;
• adhering a cushion member to the second insulating film, the cushion member being disposed between a peripheral edge part of an end face on which a terminal part of a battery is provided and the electrically conductive member, the cushion member surrounding the terminal part;
• disposing the electrically conductive member and the terminal part to cause the electrically conductive member and the terminal part to be opposed to each other with a clearance between the electrically conductive member and the terminal part;
• and
• welding the electrically conductive member and the terminal part to each other by compressing the cushion member while pressing a welding rod against a portion, of the electrically conductive member, on an opposite side to a side opposed to the terminal part, and supplying a current to the welding rod.