JPS593495Y2 - button gata dench - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of button-type alkaline batteries such as silver oxide batteries and mercury oxide batteries, and aims to improve leakage resistance.

In the conventional battery of this kind, as shown in FIG. 3, a disk-shaped anode 1 is inserted into the bottom of an anode wire 2, and an ion-permeable film 3 and an electrolyte absorber 4 are attached to the anode 1. After placing it, the absorber 4 is impregnated with a part of the electrolyte, and then a gasket 5 having an angular cross section is brought into contact with the periphery of the absorber 4, and the remaining electrolyte and the cathode active material 6 such as zinc are removed. The cathode terminal plate 7 containing the anode wire 2 is inserted inside the gasket 5, and the opening of the anode wire 2 is bent inward to seal the battery.

If the gasket 5 is soft, it will easily undergo plastic deformation when the open end of the anode wire 2 is tightened, and a short circuit may occur between the anode wire 2 and the cathode terminal plate 7, so that specific soft plastic deformation may occur. It is made of difficult and hard material.

However, when a hard gasket 5 is used, the gasket 5 does not dig into the fine vertical groove-like scratches formed on the inner surface of the can when anode wire 2 is produced, and a gap is created between the contact surfaces of anode wire 2 and gasket 5. This causes liquid leakage.

In order to improve this, attempts have been made to apply a liquid backing to the inner surface of the anode wire 2 or the outer peripheral surface of the gasket 5 in advance, and then fit the gasket 5 onto the anode wire 2 to seal the battery. When the gasket 5 was inserted, the anode wire 2 and the gasket 5 came into contact and the applied liquid backing was removed, making it impossible to fully exhibit the effect of the liquid backing.

The present invention eliminates these drawbacks, and examples thereof will be described below with reference to FIGS. 1 and 2.

An anode 21 made of a mixture of an anode active material such as silver oxide or mercury oxide and a conductive agent such as phosphorous graphite or carbon black and press-molded into a disk shape is inserted into the bottom of the anode wire 22, and the anode 2
An ion-permeable film 23 made of cellophane, polyvinyl alcohol film, etc., and an electrolyte absorber 24 made of filter paper, mixed paper of polyvinyl alcohol fibers and viscose rayon fibers, etc. are placed on top of the film 1 in order.

Next, the absorber 24 is impregnated with a portion of the alkaline electrolyte, and an annular gasket 25 having an angular cross section is brought into contact with the periphery of the upper surface of the absorber 24 .

The gasket 25 is made of polypropylene, polyethylene, polyamide, etc., and has a gasket 1 on the outer circumferential surface that communicates with the entire circumference.
A groove 26 or a plurality of grooves 26 are formed, and a water-repellent liquid backing 27 such as polyisobutylene is injected into the groove 26 before insertion into the anode wire 22.

After inserting the gasket 25, the cathode terminal plate 29 filled with the cathode active material 28 such as zinc powder and the remainder of the electrolyte is inserted inside the gasket 25, and the opening of the anode wire 22 is bent to seal the battery. .

According to such a configuration, when the anode wire 22 is tightened at the opening, the gasket 25 is compressed and the viscous liquid backing 27 in the groove 26 is pushed out, and the vertical groove formed on the inner surface of the anode wire 22 is pushed out. The liquid backing 27 can penetrate well into scratches of the shape, and the gap between the anode wire 22 and the gasket 25 can be filled with the liquid backing 27, thereby effectively preventing leakage of the electrolyte.

Furthermore, since the liquid backing 27 is filled in the groove 26 of the gasket 25 when assembling the battery, the liquid backing 27 is not removed when the gasket 25 is inserted into the anode wire 22, and the effect of the liquid backing 27 is maintained. can be used effectively.

Note that the liquid backing 27 does not necessarily need to be water repellent, but a liquid backing 27 that is water repellent has a better leakage-proof effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a button-type battery according to this invention, FIG. 2 is an enlarged sectional view of a gasket, and FIG. 3 is a sectional view of a conventional battery. 22... Anode wire, 25... Gasket, 26... Groove, 27... Liquid backing.

Claims (1)

[Scope of utility model registration request] A groove 26 is formed on the outer peripheral surface of the annular gasket 25 that is inserted into the anode wire 22, and a liquid backing 27 is injected into the groove 26.
7 is inserted into the anode wire 22, the opening of the anode wire 22 is tightened inward, and the liquid backing 27 is filled between the anode wire 22 and the gasket 25.