Matsushita Electric Industrial Co., Ltd.

Shinsei Kagaku Kogyo Co., Ltd.

Shinji Tsurutani

Hideaki Yoshio

Kenjin Masumoto

Seiichi Mizutani

Hideyuki Kobayashi

Fumio Daio

Saburo Nakatsuka

Yoshinori Iwaizono

Mamoru Iida

Syunichi Tanoue

A closure assembly for sealed batteries in which explosion-proof features are incorporated. A metal plate having a hole, an insulating resin sheet, a metal thin sheet, an insulating sheet having an air hole, a metal guide plate having a hole, and a metal cap are laid upon one another within an insulating gasket. Metal plate and metal guide plate are in contact with each other and electrically connected. Upon a build-up of pressure within the battery, the insulating resin sheet expands and ruptures, whereby a narrow part provided in the metal thin sheet positioned above the insulating resin sheet breaks, thus cutting supply of electric current.

Closure assembly for sealed batteries

A metal reinforcing plate is welded in place close to the opening on the inside of the battery case, and a plastic insulation gasket and a sealing member provided with an anti-explosion mechanism or the like are sequentially mounted on the metal reinforcing plate. By this arrangement, higher battery capacity can be realized by eliminating the waste of space because it is unnecessary to form a conventional indentation around the upper wall of a battery case. A sealed battery construction having an anti-explosion mechanism and being highly reliable in terms of leakage prevention can be thereby obtained.

Sealed battery and method for manufacturing same

A secondary battery which may be handled in a same way as conventional single cell, if the gas pressure within battery went unusually high the gas is immediately discharged outside, and bursting of the battery is prevented. Sealing portion of the secondary battery is composed by a flexible circuit board having an aperture and a safety circuit mounted thereon, a plus terminal for input/output of control provided with a gas discharge aperture and minus terminal for safety circuit provided with a gas discharge aperture which keep a surface contact with the flexible circuit board at the upper surface and are connected respectively to the safety circuit by wirings, a PTC element keeping a surface contact with the flexible circuit board at the reverse surface, a vent having a slit and is attached to the reverse surface of PTC element, the above members being united into a one-piece unit by an inner gasket, and a subfilter having an aperture and is welded to said vent at the center, which is clamped, together with the inner gasket, by the circumferential edge of an aperture-bearing filter.

Secondary battery and sealing plate assembly therefor

A closure assembly for sealed batteries in which explosion-proof features are incorporated. A metal plate (,) having a hole (,), an insulating resin sheet (,), a metal thin sheet (,), an insulating sheet (,) having an air hole (,), a metal guide plate (,) having a hole (,), and a metal cap (,) are laid upon one another within an insulating gasket (,). Metal plate (,) and metal guide plate (,) are in contact with each other and electrically connected. Upon a build-up of pressure within the battery, the insulating-resin sheet (,) expands and ruptures, whereby a narrow part (,) provided in the metal thin sheet (,) positioned above the insulating resin sheet (,) breaks, thus cutting supply of electric current.

A method for producing a sealing member for a battery includes integrally insert-molding a gasket on a peripheral edge of a metal sealing plate. The gasket is molded on the peripheral edge of the metal sealing plate by inserting the metal sealing plate between the female and male molds, the female mold having a concave surface conforming to the upper surface of the metal sealing plate and provided with a magnet or vacuum suction mouth to attract the metal sealing plate in its center, and the male mold having a surface conforming to the lower surface of the metal sealing plate, then injecting a molten resin into a cavity formed between the female mold and the male mold while pressing the female and male molds against each other by an elastic member.

Growing community of inventors

Hirakata, Japan

Shinji Tsurutani