JPS62145668A - Manufacture of button-type air battery - Google Patents

Abstract

PURPOSE:To provide a button-shaped air battery having a good property of preventing a liquid from leaking through air holes, by placing an air layer at the central portion of a sealing metal plate. CONSTITUTION:Granular zinc 8 as a negative electrode and an alkaline electrolytic solution 9 are provided in a sealing metal plate 7 clad with a copper plate on the inside surface of the sealing metal plate, so that the zinc and the solution occupy 70-85% of the internal volume of the sealing metal plate. They are then put with an electric insulation gasket 10 in a positive electrode case 1. The open end of the case 1 is calked inward for sealing. A battery 24 is thus constituted. A magnet 23 is attached to the bottom of the inside surface of a holder 22 to secure the battery 24. An air motor 21 is then rotated in the circumferential direction of the battery 24 as the bottom of the battery is located on the downside thereof, so that an air layer 11 is placed at the central portion of the sealing metal plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing button-type air cells.

In the conventional air button battery, as shown in Fig. 3, a sealing plate 7 formed by interposing an insulating gasket to the sealing plate is filled with a negative electrode active material and an electrolyte, and then a positive electrode case 1 provided with air holes is filled. It was coupled to a positive electrode group containing an air chamber, diffusion paper, water-repellent membrane, catalyst, and separator from the bottom of the cell, and the battery was sealed. In conventional sealed batteries, the volume ratio of zinc and electrolyte to the internal volume of the sealing plate (hereinafter referred to as filling rate)
was designed to be 85% to 96%. On the other hand, since air button batteries use oxygen in the air as the positive electrode active material, the filling rate in the sealing plate is regulated to 70% to 86%, and after the battery is constructed and sealed, the bottom of the positive electrode case is vibrated. The negative electrode zinc was placed in close contact with the separator.

Problems to be Solved by the Invention However, Figure 3 shows a conventional manufacturing method, ie, an excitation method, and Figures B and C show cross-sectional views of the behavior of negative electrode zinc. D indicates the vibration method. 3
The upper part of the battery 11 after sealing is adsorbed by a tip 32 via a vacuum, and the bottom of the battery 11 is applied to a metal paste 35 and vibrated using a vertical movement lever 33 and an eccentric cam 34. was. The number of vibrations was 10 to 200 times, and the height of vibration was in the range of 17 to 40 mm.As shown in 1B, the negative electrode zinc 8 was in close contact with the separator 5, and the number of vibrations was 30 times. The excitation height was set to 4Q-W, and the characteristics of one battery were determined by N(+I).As a result, the following was found.

In other words, if zinc is concentrated near the separator, the copper layer on the inner surface of the first sealing plate will become iced by the water button, causing phenomena such as hydrogen gas generation and black discoloration of the copper layer. Performance deteriorates.Also, because the negative electrode zinc 8 is in close contact with the separator, the gas in the first sealing plate exists in the gap G on the inner surface of the sealing plate, so as the first discharge progresses, the gas remains. As the zinc reaction progresses, the total volume of the negative electrode increases.When that volume exceeds the volume of the sealing plate, it puts pressure on the separator and the positive electrode.Finally, leakage from the air holes occurs. If the above-mentioned excitation is not performed, as shown in GK, the vibration may concentrate on the inner copper layer of the sealing plate, resulting in poor adhesion with the separator 5, increasing the variation in internal resistance, and greatly affecting the discharge characteristics. affect.

The present invention solves the above-mentioned problems, and is a manufacturing method for producing highly reliable air button batteries by suppressing liquid leakage from the air holes after discharge.

Means for Solving the Problem In order to solve this problem, the present invention uses centrifugal force to position the air layer in the sealing plate at the center of the sealing plate after the battery is constructed and sealed.

Function: By this manufacturing method, the inner surface of the sealing plate is uniformly frozen.
In addition to suppressing gas generation, the air located in the center is smoothly released from the air holes as the discharge progresses, and even after the discharge is completed, the volume does not exceed the volume of the sealing plate, and there is no leakage from the air holes under any conditions. It can be made stable.

Example Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

First, FIG. 1 is a sectional view of an air button battery (outer diameter 11.6 mm, height 5.4 ffjf) obtained according to the present invention. The general manufacturing method for this battery is as follows: (1) Inside a cup-shaped positive electrode case (1) made of a nickel-plated steel plate, which serves as a positive electrode terminal, (2) air diffusion paper made of paper mixed with mercerized pipe or vinylon, (3) Activated carbon of the water-repellent film 14 made of polytetrafluoroethylene, a separator made of a graft film made of graft polymerization of polyacrylic acid of the air electrode 5 filled with a nickel screen with acetylene black as the main catalyst material, and a liquid-containing layer 6. As a result, mercerized valves or nonwoven fabrics made of vinylon mixed paper are sequentially inserted and arranged. 7 A metal sealing plate whose inner surface is clad with a copper plate.The interior of the metal sealing plate is filled with bare granular negative electrode zinc 8 and alkaline electrolyte 9 to account for 70 to 85% of the internal volume of the metal sealing plate, and then insulated. gasket 10
It is incorporated into the positive electrode case via. Next, the opening of the positive electrode case 1 is tightened and sealed inward to form a battery.

The present invention is characterized by the method of forming this inner air layer located at the center of the sealing plate, and FIG. 2 shows the manufacturing method.

21 is an air motor used as a rotating body, 22 is a holder for storing a battery 24, and 23 is a magnet attached to the bottom of the holder to fix the battery. After setting in this state, the following combination experiment was conducted by rotating the air motor 21 in the outer circumferential direction using the bottom of the battery as a seat, and positioning the air layer 11 at the center of the sealing plate.

Table 1 shows the combinations.

Table 1 The above combinations were made with 20 pieces each, and after assembly, they were disassembled and the state in which the air layer 11 was located within the sealing plate was examined. As a result, it was found that an air layer 11 was reliably formed in the center of the sealing plate as shown in FIG. 1 if the rotation speed was 10,000 rpm/min for 2 seconds or more.

It was also found that at 5,000 rpm/min for 2.4.6 seconds or 14 seconds, it was difficult for the air layer 11 to be formed in the center of the sealing plate. Below, A using the production method of the present invention
The battery and the conventional product were discharged, and the number of leaks from the air holes after discharge was investigated. The results are shown in Table 2.

Table 2 In the conventional configuration, leakage from the air holes was observed.

When examining these causes, the total height is 8 to 1 in Figure 1.
5 In Figure B, □ was familiar. Furthermore, when the battery is disassembled, Figure 3B shows that although there are sufficient voids near the inner surface of the sealing plate, the zinc expands due to discharge and the separator,
Air is compressed and leakage is promoted. On the other hand, in FIG. 1, no such phenomenon was observed; zinc was uniformly dispersed in the sealing plate thickness, and no pressure on the separator or air electrode was observed.

Effects of the Invention As described above, in the present invention, by locating the air layer in the center of the metal sealing plate, it is possible to provide an air button battery with excellent liquid flow properties from the air holes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a battery according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a device that gives rotation to the battery, and FIG. 3 is a schematic diagram showing a conventional battery vibration device. C is a cross-sectional view of a conventional battery. 1...Positive electrode case, 2...Air diffusion paper, 3...Water repellent film 14...Air electrode 15...
...Separator, 6...Liquid-containing layer, end...
...Metal sealing plate, 8...Negative electrode zinc, 9...
...Electrolyte, 10...Gasket, 11...
...Air layer, 12...Air supply hole, 13...
...Sealing tape. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
・I Case 8-One member Yuzu! Jri 2-Ichitake Kishiki Shikishi 9-m-Electrolytic plate 3--Mizuno 10--1°°Scroll) 1st
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Claims (1)

[Claims] A button battery manufacturing method in which a sealing plate filled with electrolyte and negative electrode zinc is inserted into a positive electrode case housing an air electrode via a sealing ring, and the volume of the sealing plate is equal to or smaller than that of the zinc and electrolyte. A method for manufacturing an air button battery, characterized by positioning an air layer in the center of a sealing plate using centrifugal force.