JPS62170162A - Button type alkaline battery - Google Patents

Abstract

PURPOSE:To increase leakage resistance by forming an insulating ring in a shape having an L-shaped cross section. CONSTITUTION:A positive mix 6 which is press-molded is accommodated in an inner positive container 1, and a separator 7 is placed thereon. An electrolyte absorbing material layer 8 into which an electrolyte is poured is placed on the separator 7. A tablet-like amalgamated zinc negative electrode 9 and a sealing plate 10 are arranged on the absorbing material layer 8. An insulating ring 11 having an L-shaped cross section coated with a sealant is fixed in the periphery of the sealing plate 10, and positioned on a flange 2. An opening edge of an outer positive container 4 is bent inward to fasten the circumference of the sealing plate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a button-type alkaline battery using an alkaline electrolyte, and particularly to a large-sized button-type Alkaline IJX cell.

[Conventional technology]

Conventional button-type alkaline batteries, especially the normal height of about 61cm
Large button-type alkaline batteries having an outer diameter of about 14 mm or more and an outer diameter of about 14 mm or more are known.

A half-sectional view of such a conventional large button-type alkaline battery is shown in FIG. In FIG. 2, 1 is an inner positive electrode container, and the upper part of this inner positive electrode container 1 has a flange part 2,
The tip of this flange portion 2 is in contact with the inner wall portion of an outer positive electrode container 4 having a ventilation hole 3 on the bottom surface. Further, an electrolyte absorbing paper 5 is wrapped around the outer wall of the inner positive electrode container 1.
The inner positive electrode container "a1" and the electrolyte absorbing paper 5 are fitted into the outer positive electrode container 4. A positive electrode mixture 6 is compression molded and fitted inside the inner positive electrode container 1, and the electrolyte absorbing paper 5 is fitted into the outer positive electrode container 4. A separator 7 and an alkaline electrolyte impregnated material layer 8 are placed on top of the separator 7, and a tablet-shaped zinc negative electrode 9 is placed on top of the separator 7. The insulating ring 11 is fitted and positioned, and the opening edge of the outer first positive electrode container 44 is bent inward to seal it.

In the conventional button-type alkaline battery, the insulating ring 11 is provided with a fitting portion 12 that extends further into the inside of the inner positive image container 1 from above the flange portion 2 of the inner positive image container 1, as shown in FIG. IJ electrolyte leakage was prevented.

[Problem that the invention seeks to solve]

In the above-mentioned conventional button-type alkaline battery, the sealing plate 10 is fitted into the above-mentioned insulating ring 11 and sealed, the insulating ring 11 is provided with a fitting part 12, and this is attached to the inner wall of the inner positive electrode container 1. Although consideration has been given to preventing the alkaline electrolyte from leaking, the opening of the outer cathode container 4 is bent inward due to the presence of the fitting portion 12 of the insulating ring 11. That is, when sealing by caulking, the deformation of the insulating ring 11 becomes rather significant, and after the battery is completed, there is a gap between the inner circumference of the insulating ring 11 and the outer circumference of the sealing plate 10, or between the outer circumference of the insulating ring 11 and the outer positive electrode. This results in insufficient adhesion or insufficient adhesion between the fitting portion 12 and the inner circumference of the container 4, and between the fitting portion 12 and the inner circumference of the inner regular image container 1. For this reason, Alkali 1! is removed from these parts after storage or over-discharge of the Alka IJ battery. It had the disadvantage of leaking solution.

As one means of preventing this leakage resistance, a sealant was applied to the insulating ring 11 to ensure close contact between these parts, but even with this, the sealing plate 10 or the outer positive electrode container 4 still At present, the close contact with the insulating ring 11 is still insufficient, and the leakage resistance cannot be sufficiently improved.

In addition, because the above-mentioned insulating ring 11 has a special cross-sectional shape in which it has a fitting part 12 that enters into the inner positive electrode container 1 in a hanging state, the manufacturing cost of the part becomes high. However, there is also an operational problem in that it is difficult to fit into the inner regular image container 1.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an alkaline battery which eliminates the drawback of poor leakage resistance of the relatively large button-type alkaline battery as described above, and which is highly safe and easy to work with.

[Means for solving problems]

The present invention includes an inner positive electrode container having a flange portion on the upper part;
It consists of an outer positive electrode container having a ventilation hole on the bottom surface, the outer wall of the inner positive electrode container is wrapped with electrolyte-absorbing paper, and the tip of the flange of the inner positive electrode container is in contact with the inner wall of the outer positive electrode container, and the inner positive electrode Inside the container are the positive electrode mixture, separator,
``P! Arranged in the order of the dissolved liquid-impregnated material layer, and placed on the flange portion through an insulating ring with a negative cover 4 made of a sealing plate having a tablet-shaped negative drawing inside placed on the periphery. The present invention is a button-type alkaline battery formed by bending the open end of the outer positive electrode container inward and sealing the button-type alkaline battery, in which the insulating ring is formed into a truncated T-shape.

In the button-type alkaline battery described above, the configuration of the previously known button-type alkaline battery described above can be used as is, except for the configuration of the insulating ring used in the present invention.

[Effect]

According to the present invention, since the shape of the insulating ring is made into a cross-sectional shape, when the negative electrode container is fitted into the insulating ring and the opening edge of the outer positive electrode container is bent inward, that is, crimped to seal it, the shape of the insulating ring is Since the change is extremely small, there is no possibility of insufficient contact between the internal and external pressure i-container, and if gas is generated inside the battery, the edge ring can be deformed by the internal pressure, so the gas It passes between the insulating ring and the flange, and between the flange and the outer positive electrode container, and then dissipates through the vent hole provided on the bottom of the outer positive electrode container. At that time, the electrolyte tries to be drawn in along with the gas, but this! /! The decomposing liquid is collected in the electrolyte-absorbing paper to prevent it from getting mixed with the outside, and after the gas has dissipated, the insulating flange prevents the liquid from leaking.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG.

FIG. 1 is a half-plan view of a large button-type alkaline battery with a height of 17 scales and an outer diameter of 30 m.

In this battery, an inner positive electrode container 1 has a flange portion 2 at its upper portion, and the tip of this flange portion 2 fits in contact with the inner wall portion of an outer positive electrode container 4 which has a ventilation hole 3 in its bottom portion. It is. Electrolyte absorbing paper 5 is wrapped around the outer wall of this inner positive electrode container. A compression-molded positive electrode mixture 6 is placed in the inner positive electrode container 1, and a separator 7 is placed on top of the positive electrode mixture 6. Furthermore, an electrolyte-impregnated material layer 8 in which an alkaline electrolyte is injected is placed on top of the layer 8, and a negative electrode container consisting of a tablet-shaped amalgamated zinc negative electrode 9 and a sealing plate 10 is further placed on top of the layer 8. An insulating ring 11 coated with a sealant and having a cross-sectional shape according to the present invention is attached to the periphery and positioned on the seven rungs 2, and the opening edge of the outer positive electrode container 4 is bent inward to surround the sealing plate 10. It's constricting.

The battery of the above example is designated as A, and the conventional battery shown in FIG. 2 is designated as B. The results of evaluating the battery characteristics of each are shown in Table 1 below. Note that batteries A and B were all the same size.

The evaluation was conducted using a set of 10 batteries each at 45°C.
The cells were stored at a relative humidity of 90%, and the leakage state at that time was visually evaluated after the aging test shown in Table 1, and the number of cells leaking from each set is shown.

Table 1 In general, regarding the size of batteries, what are the smaller ones?
The discharge current is also small, and even those without vent holes 3 will not burst. Therefore, when considering both leakage and rupture, the present invention has a diameter of about 6 mm or more and an outer diameter of about 14 mm.
! It is a load movement in a large button type alkaline ytt cell with a battery body size of 0.9- or more.

〔Effect of the invention〕

As is clear from the results in Table 1 above, according to the present invention, a battery with excellent leakage resistance can be provided.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing an example of a button-type alkaline battery according to the present invention, and FIG. 2 is a half-sectional view of a conventional button-type alkaline battery. 1 is the inner positive electrode container, 2 is the 7th rung part of the inner positive electrode container, 3
1 is a ventilation hole, 4 is an outer cathode container, 5 is an electrolyte absorbing paper, 6 is a cathode mixture, 7 is a separator, 8 is an electrolyte impregnated material layer, 9 is a negative electrode, 10 is a sealing plate, and 11 is an insulating ring. Patent author Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1. It consists of an inner cathode container having a flange on the top and an outer cathode container having a ventilation hole on the bottom. The outer wall of the inner cathode container is wrapped with electrolyte-absorbing paper, and the flange of the inner cathode container is The tip is in contact with the inner wall of the outer positive electrode container, and the positive electrode mixture, separator, and electrolyte-impregnated material layer are arranged in this order in the inner positive electrode container, and the negative electrode container consisting of a sealing plate having a tablet-shaped zinc negative electrode inside is attached to the periphery. In a button-type alkaline battery, the battery is placed on the flange portion via an insulating ring placed on the outer cathode container, and the opening edge of the outer positive electrode container is bent inward to seal the button-type alkaline battery, in which the insulating ring has an L-shaped cross section. A button-type alkaline battery characterized by: