JPH0218524Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a button-type air battery used as a power source for a hearing aid, etc., and aims to improve a sealing material that closes an air hole provided in a positive electrode case.

Generally, a button-type air cell has a structure as shown in FIG. 1, and oxygen in the air is taken in through an air hole 2 provided in a positive electrode case 1 and used as a positive electrode active material. When storing the battery when it is not in use, the alkaline electrolyte inside the battery may evaporate through the air hole 2, or the electrolyte may absorb carbon dioxide gas and produce alkali carbonate, which may significantly deteriorate storage performance. In order to prevent this, the air holes are currently closed with a sealing material 3.

In addition, when using the battery, it is necessary to peel off the sealing material 3 from the outer bottom surface of the positive electrode case 1 to open the air hole 2. In order to facilitate the peeling off of the sealing material 3, a knob 4 extending outward is provided. As shown in FIG. 2, it is provided integrally with the closing portion 5.

The sealing material 3 used here is usually a composite material with excellent gas impermeability, which is made by coating one side of the base material with an adhesive. There will also be an adhesive.

This is not at all desirable, and the knob 4
When peeling the sealing material 3 from the outer bottom surface of the case 1 by picking it up with your hands, the adhesive may stick to your hands or the gripping part 4
There is a problem in that dirt, dust, etc. adhere to the adhesive, resulting in a very unsightly appearance.

Furthermore, when attaching the sealing material to the outer bottom surface of the positive electrode case, the knob 4 of the sealing material 3 may unnecessarily adhere to the side surface of the positive electrode case. If this happens, it becomes difficult to remove the sealing material by hand, and the bent elasticity of the sealing material may cause it to partially peel off from the outer bottom of the positive electrode case, making it impossible to reliably close the air hole. Ta.

The present invention has been made to solve these drawbacks.

That is, resin powder is sprinkled onto the adhesive on the knob of the sealant, and the adhesive is coated with the resin powder, thereby rendering the adhesive ineffective so that it will not adhere to other surfaces.

With such a structure, the grip portion of the sealant is completely free of adhesiveness, so all of the above-mentioned problems are solved.

Hereinafter, the details of the present invention will be explained using examples.

In FIG. 3, the thickness of the base material 6 of the sealing material 3 is
Using a 30μ polyester film, polyacrylic acid ester is applied as the adhesive 7 to a thickness of 15μ.
Then, fluorine resin powder 7a is placed on the adhesive of the knob 4.
Sprinkle it evenly until the adhesive is almost completely covered to eliminate the adhesive strength, and then apply it continuously to the outer bottom of the positive electrode case of 1000 button-type air batteries shown in Figure 1 to solve the problem described above. I checked to see if there were any points. In addition, in FIG. 1, 8 is a positive electrode catalyst layer, 9 is a negative electrode zinc, 10 is a separator, 11 is a water-repellent film, 1
2 is an air diffusion paper, 13 is a sealing ring, and 14 is a sealing plate.

As a result, the knob 4 of the sealing material 3 is free from dust and has a very clean appearance, and there is no crooked knob attached to the side of the positive electrode case. Ta. From this, the present invention can significantly improve battery reliability.

In addition to fluororesin, the resin powder used to disable the adhesive strength of the knob of the sealant can be any resin powder that is normally easily available, such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene fluoride, etc. It was possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a typical structure of a button-type air battery, Fig. 2 is a plan view of a sealing material that closes the air hole of the positive electrode case, and Fig. 3 is a sectional view of a sealing material in an embodiment of the present invention. It is. DESCRIPTION OF SYMBOLS 1...Positive electrode case, 2...Air hole, 3...Sealing material, 4...Knob part, 5...Closing part, 6...Base material of sealing material, 7...Adhesive, 7a...Knob part resin powder that coats the adhesive.

Claims (1)

[Scope of utility model registration request] A button-type air battery in which an air hole provided at the bottom of the positive electrode case is closed with a sealing material, the sealing material being a closing part that is applied to one side of a base material with an adhesive and pasted to the outer bottom surface of the positive electrode case. , a button-type air battery consisting of a plug part connected to the closing part and having an adhesive coated with resin powder and extending outward.