Method of forming protective coating on cell safety valve element, cell safety valve element, cell safety valve element coated with protective film, cell sealing plate using the element, and enclosed cell using the plate

Abstract

A method of forming a protection film of a safety valve element for battery prevents corrosion. The safety valve element is composed of a safety valve element having a metal substrate with a perforated pore and a metal foil laminated on a metal substrate so as to cover the pore, and a protection film is formed by coating an organic coating at least on one side of the safety valve element.

1 . A method of forming a protection film of a safety valve element for a battery comprising providing a metal substrate having a hole extending therethrough, laminating a metal foil directly to said metal substrate so as to cover said hole, and applying an organic coating on at least one side of said metal foil.  
   
   
       2 . The method of  claim 1 , wherein said organic coating is an organic resin film.  
   
   
       3 . A method of forming a protection film of a safety valve element for a battery comprising providing a metal substrate having a hole extending therethrough, laminating a metal foil directly to said metal substrate so as to cover said hole, and applying an organic coating on at least one side of covering portions of said metal foil.  
   
   
       4 . A safety valve element for a battery comprising a metal substrate having a first hole extending therethrough and a metal foil laminated directly to said metal substrate so as to cover said first hole, wherein a protection film is covered on at least one side of said safety valve element for a battery.  
   
   
       5 . A safety valve element for a battery comprising a metal substrate having a first hole extending therethrough and a metal foil laminated directly to said metal substrate so as to cover said first hole, wherein a protection film is covered on at least one side of covering portions of said metal foil of a safety valve element for a battery.  
   
   
       6 . A safety valve element for a battery according to  claim 4 , wherein said protection film is a continuous coated film of an organic coating.  
   
   
       7 . A safety valve element for a battery according to  claim 4 , wherein said protecting film is an uncut laminated film of an organic resin film.  
   
   
       8 . A safety valve element for a battery according to  claim 5 , wherein said protection film is a coated film of organic coating.  
   
   
       9 . A safety valve element of a battery according to  claim 8 , wherein said protecting film is a laminated film of an organic resin film.