Patent ID: 6911802

Claim:
A battery pack in which a plurality of square pole-like battery cells are connected in series and housed in a battery case, characterized in that: the battery case is comprised of a respective box-like upper side case and lower side case combined with each other, the plurality of the battery cells each have a battery lid respectively positioned on the front side thereof and are lined up in the left and right direction to be housed in said battery case, a negative pole side tab extending to the battery lid side connected to the battery can bottom of a battery cell, an intermediate connection tab connecting a positive pole terminal part of the battery cell to the battery can bottom of adjacent another battery cell, and a positive pole side tab connected to a positive pole side terminal part of said another battery cell are provided, said negative pole side tab and intermediate connection tab are provided to creep over the sides of the battery cans of the respective battery cells, said negative pole side tab and intermediate connection tab are respectively divided into two of a can bottom side tab and a battery lid side tab with PTC (positive temperature coefficient) interposed between these can bottom side tab and battery lid side tab, an insulating sheet (hereinafter, referred to as ┌cell side insulating sheet┘) is provided between the respective negative pole side tab, intermediate connection tab and the sides of the respective battery cans; and side edge pressing parts are respectively provided on the inner face of the upper side case and on the inner face of the lower side case to press the side edge portions extending in the front and back direction of the respective battery cells when the upper side case and the lower side case are combined with each other.