Method for forming protective coating for cell safety valve device, cell safety valve device covered with protective coating, cell sealing plate comprising the same, and closed cell comprising the same

摘要

A method for applying a protective coating on a surface of a safety valve device being part of the outer surface of a cell case so as to prevent corrosion of metallic part of the safety valve device, a cell safety valve device covered with a protective coating, cell sealing plate comprising the same, and a closed cell are disclosed. The safety valve device comprises a metallic base where a through hole is made and a metallic foil so provided on the base as to close the through hole. The safety valve device (hereinafter referred to as "safety valve device comprising a metallic base and a metallic foil") is provided with an organic resin layer on one side serving as part of the outer surface of the cell case. Alternatively, the safety valve device comprising a metallic base and metallic foil is placed in contact with a sealing plate having a through hole therein serving as a valve hole in such a way that the through hole of the metallic base communicates with the through hole of the sealing plate and joined around the through hole of the sealing plate to the sealing plate by using adhesive means, and an organic resin layer is formed on one side of the safety valve device serving as part of the outer surface of the cell case, allowing the organic resin layer to serve as a protective coating of the cell safety valve device.