JPS6220242A - Manufacture of button type alkaline cell - 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] Industrial applications The present invention relates to alkaline manganese batteries and mercury batteries.

This invention relates to a method for manufacturing a button-type alkaline battery using a silver oxide battery i and an alkaline electrolyte.

BACKGROUND OF THE INVENTION In recent years, button-type alkaline batteries have been widely used as power sources for small electronic devices. When forming the gelled zinc negative electrode of this button-type alkaline battery, as shown in FIG. After filling the mixture 3 with the alkaline electrolyte 4 from the injection nozzle 5,
After the injection, a gelled zinc negative electrode 6 is formed as shown in FIG. At this time, the injection hole diameter of the injection nozzle φ
1 and the inner diameter φ2 of the assembled sealing plate was made at a ratio of 4 to 10:1 o○.

Problems to be Solved by the Invention However, with the ratio of φ1 and φ2 shown above, the injection pressure applied to the center of the mixture surface is large, and as shown in Figure 3, gel-like zinc formed after injection. The negative electrode 6 produced a bulge on a part of the inner periphery of the assembled sealing plate. In order to weaken the injection pressure, the injection speed was lowered (~), but the same swelling still occurred, and in this state, the positive electrode was configured and the completed battery was assembled with the gelled zinc negative electrode assembled on the sealing plate inside the battery. When the φ1/φ2 value is extremely small, a portion of the injected electrolyte may leak into the insulating gasket of the assembled sealing plate immediately after injection. There was a problem in that the liquid was scattered onto the peripheral edge (section 1a in Figure 3) and leaked immediately after being assembled with the positive electrode.

In view of the above-mentioned problems, the present invention provides a method for producing a stable button-type alkaline battery in which the gelled zinc negative electrode formed after injection does not bulge on the periphery and the injected electrolyte does not scatter. Our goal is to provide the following.

Means for Solving the Problems In order to achieve this object, the present invention injects an alkaline electrolyte into a mixture of zinc chloride powder and gelling agent filled in an assembled sealing plate to form a gelled zinc powder. In the method for forming the negative electrode, the ratio between the injection hole diameter φ1a of the nozzle for injecting liquid and the inner diameter φ2 of the assembled sealing plate is within the range of 15 to 4°:100.

Function: With this manufacturing method, the injected electrolyte quickly spreads from the center of the mixture surface inside the assembled sealing plate to the entire surface.
Because it is uniformly dispersed, the gel-like zinc negative electrode that is formed after the electrolyte is injected can be placed inside the assembly sealing plate without bulging at the periphery, and some of the electrolyte will scatter immediately after being injected. can be restrained from doing so. Therefore, leakage of liquid immediately after battery construction can be eliminated, and voltage deterioration after storage can be eliminated.

EXAMPLES Hereinafter, examples of the present invention will be explained with reference to the drawings. Figure 2 shows a 7-type mercury battery HM-M (height s, syim, outer diameter 15.4 mm) obtained conventionally and according to the present invention.
FIG. A general method for manufacturing this battery is to insert the positive electrode mixture 7 into a positive electrode container 8 together with a positive electrode ring 9 and compression mold it. Then, an alkali-resistant separator 10 and an electrolyte impregnation layer 11 are placed on the second side of the molded positive electrode mixture 7,
Furthermore, a predetermined amount of gelled zinc negative electrode 60, which is a mixture of zinc chloride powder, gelling agent, and alkaline electrolyte, is placed on the sealing plate 2.
The opening edge of the positive electrode container 8 is tightened around the sealing plate 2 via the insulating gasket 1 to form a battery. Among these, the present invention is characterized by the method of forming a gelled zinc negative electrode, and as shown in FIG.
After filling the mixture 3 with 0.49 f of alkaline electrolyte 6'. Form horizontally.

At this time, the injection hole diameter φ1a of the liquid injection nozzle is 3.3mm, and the inner diameter φ2 of the assembled sealing plate is 11.0ffff, and the ratio of the former to the latter is 3o:100. As an experiment to determine this ratio, we conducted an experiment under conventional conditions (the above ratio is in the range of 4 to 10:100, but the former is 1o to the latter 1o○, l:!l
If l is small, the battery characteristics will clearly deteriorate, so we only set the ratio of 10:100, which is the most expected ratio. ) including 10:1oO.

16:100, 20: 100, 30:100, 40
100 batteries of each example were assembled under a total of six different conditions: :100°50:100. After the construction of the positive and negative electrodes, that is, immediately after the completion of the battery and after the leakage, the number of deteriorations in open circuit voltage (less than 1, soV) after 2 weeks of force and room temperature was compared, and the results are shown in the following table.

(Left below) This results in a ratio of 16-6o:1o among the above.

In the range of 5, the problem of leakage and voltage deterioration was solved, but
In the case of 0:100, the variation in short circuit current of the battery increased significantly compared to 15 to 40:100. This is because during the manufacturing process, the electrolytic solution that has just been injected gradually adheres to the tip of the injecting nozzle, and irregularly drips into the mixture inside the assembled sealing plate.

Therefore, the above ratio is suitably within the range of 16 to 40:100, but in order to facilitate mass production, it is particularly preferable to set the ratio to 30 to 4.
A range of 0:100 is more appropriate, which is 7 b/d.

As a result of conducting the same experiment with button-type mercury batteries, silver oxide batteries, or alkaline manganese batteries of other sizes, all of them showed leakage and voltage deterioration compared to the ratio applied to the present invention, regardless of size or battery type. found to solve the problem.

Effects of the Invention As described above, the present invention has a ratio of the injection hole diameter of the liquid injection nozzle to the inner diameter of the assembled sealing plate within the range of 16 to 40:100, thereby reducing leakage immediately after battery construction and voltage after storage. It can slow down deterioration, and its practical effects are significant.

[Brief explanation of the drawing]

FIGS. 1a and 1b are cross-sectional views explaining the manufacturing process of the present invention,
Figure a shows the time when the injection nozzle descends and starts pouring the electrolyte, b shows the time when the injection nozzle rises after the injection ends, and Figure 2 shows the results obtained by the conventional method and the present invention. A half-sectional view of a button-type mercury battery, Figure 3 is a cross-sectional view explaining the conventional manufacturing process, a shows the point at which the injection nozzle descends and starts injecting the electrolyte, b shows the point after the injection is finished, It is a figure which each shows the time when a liquid injection nozzle rose. 1... Insulating gasket, 2... Sealing plate,
3...Mixture of zinc chloride powder and gelling agent, 4
...Alkaline electrolyte, 6 and 5a...
・Synthetic resin injection nozzle, 6...gelled zinc negative electrode, 7...positive electrode mixture, 8...positive electrode container, 9...
... Positive electrode ring, 10 ... Separator, 1
1... Electrolyte impregnation. Name of agent: Patent attorney Toshio Nakao and 1 other person
Harley Figure 2 Figure 3

Claims (1)

[Claims] A method in which alkaline electrolyte is injected after a mixture of zinc oxide powder and gelling agent is filled into a sealing plate integrated with an insulating gasket, and the injection hole diameter of the injection nozzle is φ.
The ratio between _1_a and the actual inner diameter φ_2 of the sealing plate is 15 to 40
: A method for manufacturing a button-type alkaline battery, characterized in that it is manufactured within a range of 100.