Hitachi Automotive Systems, Ltd.

Hayato Koguchi

Shin Onose

Kouichi Kajiwara

Kohtaro Ikeda

Takeshi Hizono

Eiichi Isono

Hiroaki Egawa

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.

Prismatic secondary battery

A plating layeris formed on a surface of a battery cover, and a peripheral edge partof a cover caseis arranged on an upper surface of the plating layer. A welding partis formed at a tip part of the peripheral edge part. The welding partincludes a melted partin which the tip of the peripheral edge partis melted, and an elution partflowing from the tip onto the plating layer, and the melted partand the elution partare welded to the plating layerin the upper surface of the plating layer

Welded structure in battery, forming method of the same, secondary battery cell and secondary battery module

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Hitachinaka, Japan

Hayato Koguchi