JPS5942765A - Button type alkaline battery - Google Patents

Abstract

PURPOSE:To prevent leakage of alkaline electrolyte in digestive organs even if a battery is swallowed by accident by constructing a positive container with titanium. CONSTITUTION:A positive container 1 which also acts as a positive terminal is constructed with for example, a 0.2mm. thick titanium plate. An alkaline battery is formed by arranging as shown in the figure the positive container 1, a negative container 2 which also acts as a negative terminal, a positive active material 3 containing alkaline electrolyte, an amalgamated zinc negative electrode 4 containing alkaline electrolyte, a separator 5, and an insulating gasket 6. By constructing the positive container with titanium, the container is not dissolved by gastric juice. Therefore, even if a battery is swallowed by accident, leakage of alkaline electrolyte is prevented, consequently the battery is safety in use.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a button-type alkaline battery used as a power source for cameras, electronic desks, calculators, wristwatches, electronic games, and the like.

Conventional Structure and Problems Conventionally, a nickel-plated steel plate has been used for the positive electrode container of such a button-type alkaline battery. There was no problem with the battery itself, but as electronic games have become more popular in recent years, there have been a number of accidents in which children accidentally swallowed batteries. If a hole develops in the battery and the alkaline electrolyte inside the battery leaks out at a high concentration, it could destroy the stomach tissue, so it had to be removed through an incision.

OBJECTS OF THE INVENTION The present invention aims to prevent alkaline electrolyte from leaking into the digestive system even if accidentally swallowed by improving the positive electrode container of a battery.

In order to achieve all of the above objects, the present invention is characterized in that the positive electrode container of the battery is made of titanium. A battery having such a configuration in which the positive electrode container is disposed on one side does not suffer from perforation due to dissolution of the positive electrode container in the stomach, thereby increasing safety in the event that the positive electrode container is accidentally swallowed.

Description of examples An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a button-type alkaline battery, and in the figure, 1 is a positive electrode container which also serves as a positive electrode terminal, and is made of nickel with a thickness of 0.21 JUL. 2 is a negative electrode container that also serves as a negative electrode terminal; 3
4 is a positive electrode active material containing an alkaline electrolyte, 4 is a frozen zinc negative electrode containing an alkaline electrolyte, 6 is a separator, and 6 is an insulating gasket.

When this battery is immersed in gastric juice, electrolysis is performed by the battery voltage using the gastric juice as an electrolyte and the positive and negative electrode containers as electrodes. In conventional batteries, the cathode container melts and is locally perforated, allowing the alkaline electrolyte to leak out.

However, when the container is made of titanium, no dissolution occurs at all. This is thought to be because the surface of titanium is protected by a thin film.

Therefore, since there is no leakage of alkali within the digestive system, there is little effect on the human body, and it is sufficient to wait for natural excretion.

Now the diameter is 11. A manganese dioxide alkaline button battery with a height of 6.4 ruL was manufactured.

The specifications were as follows.

This example product (Al Conventional product (Bl Manganese dioxide amount (ql 0.57 0.57 Zinc amount (q) o, 14 0.14 thick skin) 0.2o 0.30 These batteries were Sodium 2q, Japanese Pharmacopoeia dilute hydrochloric acid 24r
One piece of rtl was diluted to 1β with distilled water and placed in an artificial gastric juice solution with a pH of approximately 1.3, and the mixture was stirred and left at 37° C., which corresponds to body temperature. Whether or not the alkaline electrolyte leaked was investigated by quantifying the concentration of potassium in the artificial gastric fluid. The results were as shown in Figure 2. Conventional product B
Leakage of the alkaline electrolyte was observed about 4 hours after immersion, whereas no increase in potassium was observed in the product A of this example, so it was determined that the alkaline electrolyte did not leak. Microscopic observation also revealed that many holes in the positive electrode container were observed in Conventional Product B, whereas in Example Field A, no change in the positive electrode container was observed at all.

Effects of the Invention As described above, the cathode container made of titanium will not be dissolved by gastric juice, and therefore, even if the battery is swallowed by mistake, leakage of the alkaline electrolyte is unlikely to occur, making it extremely safe.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of a button-type alkaline battery according to an embodiment of the present invention, and FIG. 2 is a diagram showing an increase curve of potassium concentration in artificial gastric fluid containing the alkaline battery. 1...Positive electrode container, 2...Negative electrode container, A
...Battery of the present invention, B...Conventional battery.

Claims (1)

[Claims] (1) An alkaline battery having a positive electrode made of one selected from the group of metal oxides such as mercury oxide, manganese dioxide, silver oxide, etc. as an active material, a zinc negative electrode, and an alkaline aqueous solution as an electrolyte, the positive terminal being A button-type alkaline battery characterized by a positive electrode container made of titanium.