초록 ▼

The present invention relates to a construction of an explosion-proof safety vent for small-size non-aqueous electrolyte batteries such as prismatic lithium-ion secondary batteries or with an oval cross section hence with a small area of seal plate, and to a method of producing a seal plate. It aims

The present invention relates to a construction of an explosion-proof safety vent for small-size non-aqueous electrolyte batteries such as prismatic lithium-ion secondary batteries or with an oval cross section hence with a small area of seal plate, and to a method of producing a seal plate. It aims at securing safety of a battery by allowing an explosion-proof vent to operate without fail with a simple construction at no sacrifice of the capacity. In order to fulfill this aim, it provides an explosion-proof safety vent wherein upper peripheral edge of an opening of a bottomed cell container made of metal and the periphery of a seal plate made of metal are hermetically sealed by laser welding, a rivet serving as a terminal is inserted in a through hole provided on the central portion of the seal plate and hermetically fixed by crimping via a gasket, an exhaust hole is provided between the terminal and the periphery of the seal plate, and the exhaust hole is closed by a metal foil. With such a simple structure, it allows the vent to operate without fail to prevent accident and also proposes a method of continuously producing seal plates in the form of a hoop.

대표청구항 ▼

[ What is claimed:] [1.] A non-aqueous electrolyte battery, comprising:a positive electrode, a negative electrode, and a non-aqueous electrolyte situated in a container;a rivet coupled to one of said positive electrode and said negative electrode and serving as a terminal thereto;a gasket; anda seal

[ What is claimed:] [1.] A non-aqueous electrolyte battery, comprising:a positive electrode, a negative electrode, and a non-aqueous electrolyte situated in a container;a rivet coupled to one of said positive electrode and said negative electrode and serving as a terminal thereto;a gasket; anda seal plate closing an opening of said container, said seal plate coupled to another of said positive electrode and said negative electrode and serving as a further terminal thereto, said seal plate including (a) a through hole in which said rivet is inserted and fixed thereto via said gasket and (b) an exhaust opening spaced from said through hole and closed with metal foil. [17.] A method of producing seal plates for non-aqueous electrolyte batteries, said method comprising the steps of:forming exhaust holes on a hoop of metal;closing said exhaust holes with a metal foil by pressing under pressure said metal foil to one of the surfaces of said hoop of metal thus producing a clad sheet;providing through holes on the clad sheet, said through holes spaced from said exhaust holes;forming gaskets having respective central holes in said through holes using electrolyte resistant and electrically insulating synthetic resin;inserting rivets serving as terminals in the respective central holes of said gaskets after coating the surface of said gaskets with a film of sealant and crimping said rivets; andcutting said hoop into individual seal plates for single cells. The method of producing seal plate for non-aqueous electrolyte battery as recited in claim 17, wherein the step of forming a gasket in said through hole follows a step of concavely forming the periphery of the through hole. The method of producing seal plate for non-aqueous electrolyte battery as recited in claim 17, wherein the gasket is made of polyphenylene sulfide.