Patent ID: 9627667
Date: 2017-04-18
CPC Classifications: H01M,Y02E

Claim:
1. A lid for a battery case that is formed from a metallic sheet and constitutes a battery case, comprising: a lid main body that is formed in a rectangular shape having a short side extending in a first direction along the lid main body and a long side that is longer than the short side and which extends in a second direction along the lid main body transverse to the first direction; a safety valve that includes an annular portion formed integrally with the lid main body by coining to form an annular groove in the lid main body that extends about a central portion of the safety valve whereby the annular portion comprises a grooved annular thin portion that is thinner than adjacent portions of the lid main body including the central portion of the safety valve thereof; and a pair of ribs formed integrally with the lid main body to be distinct from one another and so as to bulge from the lid main body, extending in the first direction of the lid main body, and spaced from the safety valve including the grooved annular thin portion thereof in the second direction so that one of the pair of ribs is adjacent to and spaced from one side portion of the grooved annular thin portion in the second direction and the other one of the pair of ribs is adjacent to and spaced from another side portion of the grooved annular thin portion in the second direction opposite the one side portion thereof,