Matsushita Electric Industrial Co., Ltd.

Kenji Mizuno

Hiroshi Yoshizawa

Takashi Takeuchi

Takuya Nakashima

Takabumi Fujii

Kazunori Haraguchi

Kikuo Senoo

Mamoru Iida

Yoshitaka Matsumasa

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.

Method of production of non-aqueous electrolyte battery and seal plate

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Hirakata, Japan

Kenji Mizuno