Battery, battery pack, and vehicle

A battery comprising:

• an outer container including a bottom wall, peripheral walls, and an internal cavity constructed by the bottom wall and the peripheral walls and including an opening to an opposite side to the bottom wall in a height direction, the peripheral walls including a first side wall and a second side wall opposed to each other across the internal cavity in a longitudinal direction crossing the height direction;
• an electrode assembly including a positive electrode and a negative electrode and that is accommodated in the internal cavity of the outer container;
• a lid member attached to the peripheral wall in an end portion on the opposite side to the bottom wall and that blocks the opening of the internal cavity;
• a current collection tab that protrudes from the electrode assembly in a lateral direction crossing both the longitudinal direction and the height direction in the internal cavity;
• an electrode terminal attached to an outer surface of the lid member;
• a lead disposed in the internal cavity and that electrically connects the current collection tab to the electrode terminal;
• an insulation guard formed from a material having electrical insulating properties, and that electrically insulates the lead and the current collection tab from an inner surface of the outer container in the internal cavity;
• a first protrusion connected to the insulation guard and that protrudes from the insulation guard, a protruding end of the first protrusion abutting on a boundary portion between the first side wall and the bottom wall;
• and
• a second protrusion connected to the insulation guard and that protrudes from the insulation guard, a protruding end of the second protrusion abutting on a boundary portion between the second side wall and the bottom wall, wherein
• the insulation guard includes a guard bottom surface opposed to the bottom wall,
• the first protrusion protrudes from the guard bottom surface toward the boundary portion between the first side wall and the bottom wall, and
• the second protrusion protrudes from the guard bottom surface toward the boundary portion between the second side wall and the bottom wall.