JPS5914229B2 - alkaline battery - Google Patents

Description

[Detailed description of the invention] This invention includes silver oxide batteries, manganese dioxide batteries, etc.

The purpose is to improve the leakage resistance of potassium batteries. In this type of battery, a liquid sealant such as asphalt pitch or fatty acid polyamide is generally interposed between the battery container, metal sealing plate, current collector rod, etc. and the gasket to ensure liquid tightness inside the battery. The liquid-tight effect was not sufficient, and the leakage resistance was rather poor.

As a result of intensive studies in light of the above circumstances, the inventors found that adding a specific rust preventive agent to the alkaline electrolyte improves the leakage resistance of the battery, which led to the creation of this invention. Ivy.

This invention will be explained below based on the drawings.

Figures 1 and 2 show an example of an alkaline battery according to the present invention. 2 is a mixture of amalgamated zinc active material and a glue such as sodium polyacrylate/carboxymethyl cellulose, which is then mixed with a specific anti-rust agent. The cathode side is gelatinized by injecting most of the alkaline electrolyte containing the agent, and 31 is a separator consisting of a liquid-absorbing layer such as vinylon-rayon mixed paper, a cellophane layer, and a hydrophilically treated microporous polypropylene film. It is.

Reference numeral 4 denotes an anode can constituting a battery container in which the above-described anode mixture 1 and separator 3 are placed, and a portion of an alkaline electrolyte containing a specific rust preventive agent is injected into the bottom of the can in advance. The can opening, into which the cathode terminal plate 5 constituting the metal sealing plate filled with the cathode agent 2 is fitted via an annular gasket 6 having an L-shaped cross section and made of synthetic resin such as polyethylene, is inserted inward. Tighten to seal the inside of the battery.

T is a sealant made of, for example, asphalt pitch and process oil, which is interposed in a small gap 8 at the interface between the gasket 6, anode can 4, and cathode terminal plate 5.

In the above configuration, the specific rust preventive agent contained in the cathode agent 2 and the electrolyte injected at the bottom of the anode can 4 is benzotriazole or its derivative, and the derivative has the following general formula; represents a substituent such as an alkyl group or halogen, such as methylbenzotriazole, chlorobenzotriazole, and the like.

This rust preventive agent is stable in an alkaline electrolyte and has the ability to dissolve at will. If too much is dissolved, the battery characteristics will be impaired}, and usually 0.01 to 0.5% by weight. The content is preferably about 0.3% by weight.

As is clear from the above structure, if benzotriazole or a derivative thereof is included in the alkaline electrolyte injected into the battery, this rust preventive agent will be added to the anode can.
and chemically bond to the metal surface of the cathode terminal plate 5 to form a film-like substance, which is bonded to the gasket 6 and cathode can 4 through the sealant 7. In order to achieve good adhesion with the cathode terminal plate 5 and the metal surface, as well as to exhibit water repellency and rust prevention functions on the metal surface, the alkaline electrolysis from the gap 8 where the sealant 7 is interposed is due to these factors. Effectively prevents liquid leakage.

The table below shows the leakage resistance test results of the button-type alkaline battery A of the present invention in which 0.3% by weight of benzotriazole was included in the alkaline electrolyte using the above-mentioned configuration. This table shows a comparison with the conventional battery B which did not contain any liquid, and it can be seen from this table that the alkaline battery of the present invention has extremely excellent leakage resistance.

In the leakage resistance test, 100 batteries A and B were tested at 45°C. The number of batteries in which leakage was observed after being left in an atmosphere of 90% RH for three months was investigated.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of an alkaline battery of the present invention;
FIG. 2 is an enlarged view of the portion shown in FIG. 1.

Claims (1)

[Claims] 1. An alkaline battery characterized by containing benzotriazole or a derivative thereof in an alkaline electrolyte.