TH36610A - Closed cells and sealing devices. - Google Patents

Abstract

DC60 (14/01/42) The purpose of this invention is to provide a sealed battery capable of instantly releasing its internal pressure and simultaneously isolating any existing current connections to effectively protect itself from overheating and explosion, thereby ensuring its safety and reliability. When the internal pressure of the sealed battery is increased due to short circuits, overcharging, reverse charging, or similar causes, the sealing element consists of a sub-part of a valve 5 constructed from a metal base plate 1 on which more than one perforated opening 3 is arranged along a continuous circumference with narrow gaps between them, and a thin metal plate 2 is layered onto the inner surface of the metal base plate 1 to seal the perforated openings 3. When the internal pressure of the sealed battery is increased, areas of the narrow gaps in the metal base plate, which are deformable by small forces, are stretched to form a circular area of the metal base plate. By the numerous perforated openings 3 arranged on a self-extending circumference, a sealing device with such a structure is stretched onto the surrounding inner surface of the open end area of the outer container 30, which contains the electrode sub-assemblies consisting of positive electrode 32a, negative electrode 32c, and separator 32b, with the electrolyte inside, to seal the open end area of the outer container 30 (Figure 3). The purpose of this invention is to provide a sealed battery capable of instantly discharging its internal pressure and simultaneously isolating the existing current connections to effectively protect itself from overheating and explosion, thereby ensuring its safety and reliability. When in a completely sealed battery, internal pressure is increased due to short circuits, overcharging, reverse charging, or similar causes. The sealing device consists of a valve sub-assembly 5, which is made from a metal base plate 1, on which the openings More than one perforated opening 3 is arranged along a continuous circumference with narrow gaps between them, and a thin metal plate 2 is layered onto the inner surface of the metal base plate 1 to close the perforated openings 3. When the internal pressure of the enclosed battery is increased, areas of the narrow gaps of the metal base plate, which can be deformed by small forces, are stretched to create a circular area of the metal base plate enclosed by more than one perforated opening 3 arranged along the continuous circumference. This structural closure is then stretched onto the surrounding inner surface of the open end of the outer container 30, which contains the electrode sub-assembly consisting of positive electrode 32a, negative electrode 32c, and separator 32b with the electrolyte inside, to close the open end of the outer container 30.

Claims (7)

1. A sealed battery consisting of an outer container, electrode components comprising a positive electrode, a negative electrode, and a separator, enclosed within the outer container along with the electrolyte, and a sealing component attached to the surrounding inner surface of the open end of the outer container to close the open end. This sealing component consists of a tongue component and a thin metal plate. The tongue component is made from a metal base plate in which more than one perforated opening is arranged along a continuous circumference with small gaps between each opening, and a thin metal plate is overlaid on the inner surface of the metal base plate to close these perforated openings. The areas of these small gaps between the openings made on the metal base plate, which are deformable by small forces, are stretched to create a circular area of the metal base plate enclosed by the more than one perforated opening. Positioned on a continuous circumference, it is made to protrude as the internal pressure of the battery increases. 2. A sealed battery conforming to clause 1, where thin metal plates are layered within a circular area enclosed by more than one perforated opening, is connected to a lead casing for conducting current from the electrode components. When this circular area enclosed by more than one perforated opening is expanded due to internal battery pressure, the lead casing is electrically isolated from the thin metal plates, cutting off the current. 3. An enclosed battery corresponding to item 1 or 2, where more than one perforated opening is present. Such openings are circular openings of equal diameter, arranged at equal intervals along a circumference with a radius around the center of the tongue sub-part, which is an example of a continuous circumference. 4. A sealed battery that conforms to any of the conditions in clauses 1 through 3, where the total length of all the openings made constitutes more than one perforated opening on such continuous circumference, shall be between 30 and 85% of the total length of the continuous circumference. 5. A sealed battery that conforms to any of the items in clauses 1 through 4, where the metal base plate is made of steel, stainless steel, copper, or aluminum. 6. A sealed battery that conforms to any of the items 1 through 5, where such thin metal sheet is a thin sheet of steel, thin sheet of stainless steel, thin sheet of copper, thin sheet of nickel, or thin sheet of nickel-iron alloy. 7. Cover parts for use in batteries that comply with any of the claims in clauses 1 through 6 (7 claims, drawings, pictures).