Nisshin Steel Co., Ltd.

Nippon Steel Nisshin Co., Ltd.

Masato Ootsuka

Shigeru Morikawa

In a lid for a battery case where an annular thin portion is formed integrally with a lid main body by coining, a pair of ribs formed integrally with the lid main body so as to bulge from the lid main body and extending in a short direction of the lid main body are disposed on both sides of the annular thin portion in a long direction of the lid main body.

Lid including rib adjacent safety valve for a battery case

In a configuration where an annular thin portionis formed integrally with a lid main bodyby coining, a bulging portionis formed integrally with the lid main bodyso as to bulge out from the lid main body, and the annular thin portionis provided in a flat portionof the bulging portion

Lid for battery case with a safety valve

In a method for manufacturing a battery safety valve according to the present invention, a stainless steel metal sheet is used, and an thin annular portion constituting an edge portion of a safety valve is formed in a lid by simultaneously pressing annular projecting portions provided respectively on a punch and a die so as to oppose each other, against respective surfaces of the lid.

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Osaka, Japan

Masato Ootsuka