JPS5887780A - How to store air button batteries - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for storing an air button battery having an air hole.

Air button batteries have the advantage of high capacity because they use oxygen in the air as the positive electrode active material. For example, R-44 type (diameter 11.6 mm, height 5.4 mm)
), the discharge capacity of the mercury battery is 220 mAh, while the air button battery has approximately twice the capacity at 400 mAh.

A feature of this battery is that air (oxygen) is taken in through air holes provided in the battery case, and the air (oxygen) is ionized by a catalyst, forming a battery system via zinc at the negative electrode and a separator. The final reaction is expressed by the following formula: % However, since this battery has an air intake hole in the case, during storage, a sticker paper with adhesive is placed over the air hole to prevent consumption of the electrolyte and air intake. The entrance of Runo was suppressed.

When using batteries, this sticker paper is removed.

If the battery is still in use, the electrolyte in the battery is evaporated and consumed, resulting in a decrease in capacity due to the rate-limiting rate of the electrolyte. For example, 1 in 60'C
In a week it's about ÷, in two weeks it's almost ¥ba:, 1 is gone.

In order to eliminate these phenomena, adhesive tape is placed over the air holes of this battery to prevent the electrolyte from getting trapped.
If stored at high temperatures, the adhesive on the tape will extrude and become sticky. Furthermore, it becomes difficult to attach and detach the battery, and the adhesive remains attached to the battery.

Furthermore, the adhesive may act as an insulator when loaded into the equipment to be used.

The present invention eliminates these problems and makes it possible to easily attach and detach the device to the device.

Below, as an example of the present invention, R-44 type (diameter 11
, 6 mm, x height 5.4 mm) will be explained using an air button battery as an example.

A partial cross-sectional view of the battery and a sealing material are shown. In the figure, 1 is the positive electrode case, and there is a hole 2 with a diameter of 066mm at the bottom for taking in air. 3 is a sealing material that closes air holes during storage, which is a feature of the present invention.

On one side of this /-rule material 3, the diameter is 0.511mm, which is the same size as the air hole, and the height is the same as the thickness of the case 1 (here, the case thickness is 0.51mm) at a position corresponding to the air hole 2. 3) convex portions 21L.

When storing the battery, the air holes 2 are closed by the convex portions 2& of the sealing material, thereby suppressing the passage of air.

This sealing material is made of alkali-resistant synthetic resin such as polyvinyl chloride, nylon, polypropylene, polytetrafluoroethylene, polyethylene, and the like. Polypropylene was used here. It is best to set the height of 2a to be the same as the thickness of the case because if it is higher than the thickness of the case, it will put pressure on the inside of the battery. 4 is a diffusion paper made of cellulose; 5 is a diffusion paper made of cellulose;
1 is a water-repellent film made of fluororesin, 6 is an air-activated catalyst mainly composed of activated carbon, 2 is a separator, 8 is a liquid-containing agent, 9 is a gasket made of nylon, 1o is a sealing plate, 11 is a negative electrode active material It is.

The electrolyte used was 10M KOH saturated with zinc oxide.

A comparative evaluation was conducted between the configuration A according to the present invention and the conventional configuration, that is, a configuration in which a sticker paper using an adhesive is applied, and a configuration C in which the air holes are opened without doing anything.

The following table shows the properties after storage for 2 weeks at 60'C.

As a result, although the capacity retention rate was comparable for configurations A and B, in terms of appearance, with sticker paper using adhesive, the adhesive adhered to the case when the sticker paper was removed after storage. Also, adhesive was protruding around the sticker paper.

In the case where no sealant was used, the capacity was significantly reduced and leakage from the air holes was observed.

On the other hand, in the present invention, such a phenomenon is not observed, and the sealing material can be easily attached and removed. Furthermore, whereas sticker papers using adhesives tend to lose their adhesive strength over time, the present invention has no such problem.

[Brief explanation of the drawing]

The figure shows a cross-sectional view of an air button battery and a sealing material. 1...Positive electrode case, 2...Air hole, 2
a. Old... Convex part, 3... Seal material, 4... Song.
Diffusion paper, 5... Water repellent film, 6... Catalyst,
7...Separator, -8...Liquid-containing material,
9...Gasket, 1o...dan/seal r-1 board,
11...Negative electrode active material.

Claims (1)

[Claims] An air button battery with an air hole in the positive electrode case, and a sealing material made of synthetic resin with a convex portion of the same diameter as the air hole at a position corresponding to the air hole, and the convex portion during storage. A method for storing air button batteries characterized by blocking the air holes.