JPS60258861A - Manufacture of alkaline battery - Google Patents

Abstract

PURPOSE:To obtain a battery with improved discharge performance under the condition of heavy load and low temperature by making a gel-like zinc negative electrode by pouring electrolyte containin a compound such as Na-di-n-octylsulfosuccinate into a mixture powder composed of amalgamated zinc and a pasty material. CONSTITUTION:After given amounts of an amalgamated zinc powder and a pasty material such as soda polyacrylate are packed into a sealing plate also serving as a negative terminal, alkaline electrolyte containing Na-di-n-octylsulphosuccinate or Na-dinonylnaphthalene sulfonate is poured into the packed materials, thereby making a gel-like zinc negative electrode. Then, an alkaline battery of the button type or similar type is assembled by using the thus made negative electrode. Since a surfactant is contained in the electrolyte of this alkaline battery, the evaporation of moisture from the electrolyte can be suppressed between the time of electrolyte pouring and the time when the negative electrode is attached to the positive electrode. Consequently, it is possible to equalize the quality of the zinc negative electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to a method for manufacturing an alkaline battery using an improved gelled zinc cathode.

[Technical background of the invention and its problems]

In alkaline batteries that use a gelled zinc cathode formed by kneading zinc powder, an alkaline electrolyte, and a glue, conventionally, the gelled zinc cathode is formed by dispersing zinc powder in an alkaline electrolyte that has been made into a gel beforehand. I was getting it. However, the zinc cathode obtained by such a method has a drawback of low accuracy in weighing.

Therefore, recently, Japanese Patent Application Publication No. 57-60660 and Japanese Patent Application Publication No. 5
As shown in No. 7-60661, a method has been used in which a mixed powder of zinc powder and a paste is first weighed, and then an alkaline electrolyte is poured into it to form a gelled zinc cathode.

However, in gelled zinc cathodes that are not kneaded, the zinc powder is not uniformly dispersed and the surface of the zinc powder is not sufficiently wetted, resulting in low activity, which deteriorates the discharge performance especially in the early stage of discharge and causes unevenness. Furthermore, there were drawbacks such as shortening of battery life.

[Purpose of the invention]

This invention eliminates the above-mentioned drawbacks, improves the discharge performance of the battery under heavy loads and low temperatures, has a large initial capacity, has a long shelf life, and is a method for producing an alkaline battery that can make each performance uniform. This is what we are trying to provide.

[Summary of the invention]

In the production of alkaline batteries, the present invention involves weighing out a predetermined amount of a mixed powder of zinc chloride and an amount of glue, adding Na-zi-low octyl sulfocinate or N? It is characterized by the use of a zinc cathode obtained by injecting an alkaline electrolyte containing dinonylnaphthalene sulfonate.

〔Effect of the invention〕

In the gelled zinc cathode used in this invention, the alkaline electrolyte contains surfactant Na-di-n-octyl sulfosuccinate or Na-dinonylnaphthalene sulfonate, so that the zinc chloride powder is uniform and stable. This increases the affinity with the electrolytic solution and helps the dispersion of discharge products.

Therefore, it is possible to improve the discharge performance of the battery under heavy loads and at low temperatures, and to increase the initial capacity.

In addition, since the electrolyte contains a surfactant, the zinc cathode prevents moisture in the electrolyte from evaporating into the air between the time the electrolyte is poured and the anode is fitted. It is possible to measure the uniformity of quality.

Therefore, it has the advantage of equalizing each battery's performance and extending its storage life.

[Embodiments of the invention]

Hereinafter, an embodiment of the present invention will be described in the case of a button-type alkaline battery with reference to the drawings.

In the attached drawings, reference numeral 1 denotes a metal outer container that also serves as an anode terminal, which is made of nickel-plated iron, and contains silver oxide (Ago, Ag).
A mixture molded body 2 containing manganese dioxide (Mn02) or manganese dioxide (Mn02) as an anode active material is packed in close contact with the inner wall thereof. Next, a separator 3 is placed on top of the mixture molded body 2. This separator 3 is made of, for example, Q, a 1 mm thick microporous polyethylene layered with cellophane on both sides.

A nonwoven fabric 4 made of rayon is provided on the separator 3,
A gelled zinc cathode 5 made of an alkaline electrolyte is placed on top of the plate ζ. 6 is a sealing plate made of iron plated with copper on the inside and nickel on the outside, which also serves as a cathode terminal; an insulating backing 7 is fitted around its periphery, and the opening 8 of the metal outer container 1 is folded inward. Complete the battery by bending and tightening.

The above-mentioned gelled zinc electrode 5 is made by mixing 100 g of 10% by weight frozen zinc powder of 48 to 100 methane and 5 g of sodium polyacrylate powder as a glue, and weighing out a predetermined amount equivalent to one battery. and insert it into the sealing plate 6 which also serves as a cathode terminal, and
a-Di-n-octyl sulfosuccinate or Na
- It is formed by pouring 26 g of caustic soda solution containing 0.02% by weight of dinonylnaphthalene sulfonate and dissolving zinc oxide.

The performance of the thus obtained button-type silver oxide alkaline battery [A] according to the present invention and a conventional battery of the same type that does not contain a surfactant [B] is as follows.

Table 1 shows the closed-circuit voltage after 5 seconds of discharge with a constant resistance of -1012.2 Ω, according to the discharge depths of 0 inches, 40 inches, and 80 inches. Table 2 also shows the duration up to 1 and 2 ■ in constant resistance discharge at 20° C. and 30Ω. Furthermore, the third
The table shows the results of storage at 60℃ (A) (Bl Both are 100% immediately after manufacture, and 20% after storage for 20 and 40.60 days.
The figure shows the discharge capacity maintenance rate [chi] when discharged at 0°C and 30Ω until the voltage reached 1.2V. Note that the number of test batteries for obtaining these data was 5 each for (A) (Bl).

Table 1 Table 2 Table 3 As is clear from Tables 1 to 3, the product according to the present invention [A] is superior to the conventional product CB in terms of closed circuit voltage, duration, and maintenance rate. It is clear that the discharge performance and storage property are excellent.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

[Brief explanation of drawings]

The accompanying drawing is a sectional view of a button-type alkaline battery obtained according to an embodiment of the present invention. 1... Metal outer container 2... Anode active material 3... Separator 4... Nonwoven fabric 5... Gel-like zinc cathode 6... Sealing plate 7... Insulating backing 8... Opening Section Applicant: Toshiba Battery Corporation 4356 7 A 2 Commissioner of the Patent Office Manabu Shiga Patent Application No. 115861/1983 2 Title of Invention Process for Producing Alkaline Batteries 3 Patent Applicant Related to the Amendment Person Case (353 ) Toshiba Battery Co., Ltd. 4 Agent 6, Amendment 1 Contents of amendment to the specification) Table 1 stated on page 6 of the specification of the present application is corrected as follows. Table 1

Claims (1)

[Claims] Weigh out a predetermined amount of mixed powder of zinc chloride and glue, and add Na-
A method for producing an alkaline battery, which comprises injecting an alkaline electrolyte containing di-n-octyl sulfosuccinate or Na-dinonylnaphthalene sulfonate to form a gelled zinc cathode, and using this to construct a battery. .