TH42402A - Closed battery - Google Patents

Abstract

DC60 (06/09/42) The purpose of this invention is to provide a sealed battery capable of rapidly discharging the internal pressure of the battery and simultaneously disconnecting the current to effectively protect the battery itself from overheating and explosion, so that the safety and reliability of the battery may be ensured, when, the internal pressure rises due to short circuits, overcharging, reverse compression, or similar in such a completely sealed battery. The sealed battery of this invention is provided with a sealing unit reserved as a valve chip, consisting of a metal substrate 1 in which a valve unit 5 is provided and zoned by a brake line 3, and a metal foil 2 attached to the inner surface of the metal substrate 1. When the internal pressure of the battery rises, the valve unit 5 is lifted from the metal substrate from a curved pivot point 4 to allow the opening of valve 7 to be created, so that the metal foil 2 is allowed to burst stably and correctly at a specified pressure, specifically. At low pressures, to vent the gases inside the battery, in addition, with lead wire 6 attached to metal foil 2, this burst can brake the current so that the battery can be prevented in advance from exploding. The purpose of this invention is to provide a sealed battery capable of rapidly releasing the internal pressure of the battery and at the same time disconnecting the current to effectively protect the battery itself from temperature rise and explosion so that it may ensure the safety and reliability of the battery, when the internal pressure rises due to short circuits, overcharging, backcharging, or similar in such a completely sealed battery. The sealed battery of this invention is provided with a sealing unit reserved as a valve chip, consisting of a metal substrate 1 in which the valve unit 5 is provided and zoned by a brake wire 3, and metal foil 2 attached to the inner surface. In the metal substrate 1, when the noise level inside the battery increases, valve unit 5 is lifted above the metal substrate. From the curved pivot point 4, valve 7 is created to allow the metal foil 2 to burst stably and correctly at a specified pressure, especially at low pressures, to vent the gas inside the battery. In addition, with lead wire 6 attached to the metal foil 2, this burst can brake the current so that the battery can be prevented from exploding in advance.

Claims (7)

1. A closed battery consisting of an electrode unit comprising a positive electrode, a negative electrode, and an separator; an electrolyte; a battery container in which the electrode unit is housed together with the electrolyte; and a closed unit that is fitted into the outer inner edge of the open end of the battery container to open that open end of the battery container, where the closed unit contains a metal substrate, a valve unit arranged within the metal substrate and confined by a brake line to reserve it as a discharge chip. In such a way that the internal pressure of the battery is increased, the valve unit bends from a curved pivot point to allow the metal substrate to have an opening for the release of the internal pressure, and a metal foil is attached to the inner surface of the metal substrate. 2. A sealed battery as per claim 1 where the metal foil is in contact with the lead unit for conducting current from the electrode unit to the sealed top, and when the valve unit operates to release the internal pressure, the lead unit does not have electrical contact with the metal foil to cut off the current. 3. A closed battery as per claim 1, in which the valve unit is arranged in a circular form, of which part is a curved pivot point. 4. A closed battery as per claim 1, in which the said valve unit has a circular arrangement and a curved pivot point is provided with one arm. 5. A sealed battery as per claim 1, where the valve unit is arranged in a manner resembling a valve. 6. A sealed battery pursuant to any one of the claims 1 through 5, where the metal substrate is made of one of the metals selected from a group including steel plate, stainless steel plate, copper plate, and aluminum plate. 7. Closed batteries pursuant to claims 1 through 6 where such metal foil is any metal foil selected from a group including iron foil, stainless steel foil, copper foil, aluminum foil, nickel foil, and nickel-iron alloy foil (Clause 7, 2 pages, 6 figures).