Hitachi Automotive Systems, Ltd.

Hiroaki Egawa

Kouichi Kajiwara

Hayato Koguchi

Takeshi Hizono

A prismatic secondary battery includes a battery case in a prismatic shape and a battery cover which seals up an opening part of the battery case. The battery cover has a convex part which projects toward the inside of the battery case, faces an inner surface of a side wall part of the battery case, and extends continuously along the entire periphery of the side wall part. Cover thickness of a contact part of the battery cover which is in contact with the upper end of the side wall part of the battery case at a position outside the convex part is greater than &#xbd; of cover thickness of a blockage part blocking up an opening part at a position inside the convex part and is less than the cover thickness of the blockage part.

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Hitachinaka, Japan

Hiroaki Egawa