Hitachi Automotive Systems, Ltd.

Yukihiro Soga

Shou Saimaru

A square battery includes a battery can surrounded by four side wall portions, and having an upper end portion on one side in a height direction of the side wall portions opened and a bottom portion in a lower end portion on the other side in the height direction, and a battery lid welded to the upper end portion to seal the battery can, wherein between the battery can and the battery lid, a lateral boundary surface in a lateral direction crossing the height direction of the side wall portions and a vertical boundary surface in a vertical direction crossing the lateral boundary surface and along the height direction of the side wall portions are formed, at least a part of the lateral and vertical boundary surfaces being welded by a laser radiated in the vertical direction along the height direction of the side wall portions.

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Hitachinaka, Japan

Yukihiro Soga