JPS62140380A - air button battery - 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 Field of Industrial Application The present invention relates to improvements in air button batteries, particularly air diffusion papers.

Conventional Technology Conventional air diffusion papers for air button batteries include woven synthetic resin fibers, non-woven fabrics, and even kraft paper.

materials are widely used.

The air diffusion paper has the role of uniformly diffusing the oxygen required during battery discharge to the air electrode, which is the positive electrode.

Therefore, it has been thought that any porous material can be used as air diffusion paper.

Problems to be Solved by the Invention However, since air button batteries absorb oxygen from the air through the air supply hole formed at the bottom of the positive electrode case and use it for battery discharge, they are greatly affected by the battery discharge environment, especially humidity. It's easy to accept. In an environment where the relative temperature is 80 degrees or higher, the effect is significant, and it is impossible to extract 100% of the battery capacity.

When the relative humidity is 80% or higher, the battery capacity decreases to 80-9.
At 0% discharge, the electrolyte inside the battery leaks from the air supply hole. At this time, the air diffusion paper also becomes wet with the electrolyte, making it impossible for oxygen to diffuse to the air electrode.

The object of the present invention is to improve an air diffusion paper for diffusing oxygen from the air diffusion paper to the air electrode even at relative humidity of 80% or more.

3.Means for Solving the Problems The present invention solves the problems mentioned above; in order to solve the problems mentioned above, the present invention is made by using a porous and electrolytic solution. ; Uses air diffusion paper treated with water-repellent paraffin to prevent staining.

Water-repellent treated paraffin/ζ air diffusion paper easily absorbs 7:Ji even if 1141 electrolytic fluid comes out from the air electrode.
Oxygen can be diffused to the air electrode without any trouble and without impairing the function of air waves.

Example DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings.

In the figure, 1 is the negative electrode case, and the nylon ring 2 is attached to the periphery.
1 is fitted with the shape 1, and an electrolytic solution consisting of polar zinc, potassium hydroxide, and water DL, indicated by 3, is housed inside.

It is a 4 in 1, positive 11ν case, and the center of its inner bottom is in the shape of a recess, and an air diffusion paper 5 is placed in the recess. .

The air diffusion paper 5 has a thickness of 0.1 to 0.2 mm, and is made of filter paper, woven or nonwoven fabric made of cellulose or synthetic fibers such as vinylon and nylon.

For water repellent treatment of the air diffusion paper 5, 10 parts by weight of paraffin is added to 1
Water-repellent treatment is possible by immersing air diffusion paper in a solution dissolved in 90 parts by weight of J chloroethane and then drying it under ventilation conditions at 50-6°C. This process allows paraffin to adhere only to the surface of the fibers,
It is possible to obtain water-repellent air diffusion paper without impairing air permeability at all.

After placing the air diffusion paper 5 on the bottom of the positive electrode case 4, a polytetrafluoroethylene porous film 6 was placed on the diffusion paper 5, and a 60-mesh nickel screen was placed using activated carbon and acetylene black as the main catalyst materials. The filled air tube 7 and the separator 8 made of a microporous polypropylene membrane are placed in order on the inner bottom of the positive electrode case 4.

Next, the nylon ring 2 filled with zinc and electrolyte 3 and the negative electrode case 1 are fitted together with the positive case 4, and the opening of the positive electrode case 4 is bent inward. , - air button batteries can be completed. In the figure, 9 is an air supply hole, and 10 is a tape for sealing the air supply hole.

In this case, a battery A and a battery B using air diffusion paper that has not been water-repellent treated as in the past were made with an outer diameter of 11.6πm and a total height of 6.4mm. Continuous discharge of 250Ω was performed at 45° C. and 90% relative humidity, and the results shown in the following table were obtained.

As can be seen from the results of the effect table of the invention, the battery C1 using water-repellent air diffusion paper was found to be able to exhibit very good performance even in a humid environment.

? It was found that leakage of the electrolyte 6benzo from the air supply hole during discharge path r was much better than in conventional batteries.

By treating the air diffusion paper with water repellency as described above, it is possible to provide an air button battery that is excellent even in a humid environment.

[Brief explanation of drawings]

The figure is a cross-sectional view of an air button battery according to an embodiment of the present invention. 100.・Negative electrode case, 2... Nylon ring, 3... Negative electrode zinc and electrolyte, 4... Positive electrode case, 5... Air diffusion paper, 6... Water repellent film, 7
...Air electrode, 8...Separator, 9.
...Air supply hole, 1o...Tape to seal the air supply hole.

Claims (2)

[Claims] (1) An air button battery that has a recess with air supply holes in the inner bottom of the positive electrode case, and an air diffusion paper treated with water repellent mainly with paraffin is placed in the recess. (2) The air button battery according to claim 1, wherein the water-repellent treatment of the air diffusion paper is performed by immersing the air diffusion paper in a dilute paraffin solution prepared by dissolving paraffin in trichloroethane or benzol, and then drying it.