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

• Main Authors: YOSHIYUKI SUGIMOTO, KINJI SAIJO, OKAMOTO HIROAKI
• Format: Patent
• Language: English
• Published: 28.03.2001
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention provide a method of forming a protection film of a safety valve element for battery which prevents from corroding a metal portion by covering protection film on the safety valve element for battery, a closing plate for a battery using same and a closed battery using same. A safety valve element of the present invention is composed of a safety valve element 10 comprising a metal substrate 1 having a perforated pore 4 and a metal foil 2 laminated on a metal substrate 1 so as to cover perforated pore 4 and a protection film 3 which is formed by coating an organic coating at least on one side of a safety valve element 10. Further, a closing plate puts a safety valve element 10 to provide a protection film 3 which is coated with organic film on a closing plate 6 of battery container to provide perforation 4 which is an opening of a safety valve so as to face perforations of a metal substrate 4 and perforation of a closing plate 7 and then to glue around perforation of a closing plate 7, and a closing plate of a battery is made. Furthermore, there is closed an opening of a battery container that fixes electrode which consist of positive electrode, negative electrode and separator, and a closed battery is made.