JPS58106768A - Alkaline battery - Google Patents

Abstract

PURPOSE:To enable the leakage of an alkaline electrolyte to be detected with the eyes in the initial stage of the leakage by providing a matter, which is discolored by an alkali, near the sealing part of an alkaline battery. CONSTITUTION:A positive electrode 1 made of mercury oxide, a negative electrode 2 made of mixture consisting of amalgamated zinc grains and an alkaline electrolyte, and a separator 3 are sealed in the combination of a positive case 4, a negative sealing plate 5 and a gasket 6, thereby constituting a button-type alkaline battery. After that, an indicator layer 12 prepared by dissolving 1 part of cresol red into the mixture liquid consisting of 50 parts ethyl alcohol and 50 parts water, is applied to the periphery of the sealing part of the battery before being dried. As a result, since the indicator layer 12 immediately turns into red when the alkaline electrolyte leaks out of the battery, the leakage of the electrolyte can be judged with the eyes in the early stage.

Description

[Detailed Description of the Invention] The present invention provides for alkaline battery producers, sellers, users, etc.
This technology enables early and clear determination of whether or not the electrolyte contained in the battery has leaked.0 Batteries that use alkaline electrolytes have a lower battery life than batteries that use other electrolytes, such as ammonium chloride. The electrolyte is relatively easy to leak from the sealing part, and the leaked electrolyte corrodes the battery terminals and device terminals, resulting in poor contact. Especially in the early stages of leakage, it is often in the form of water droplets, which is difficult to see with the naked eye, and can be observed under a microscope by an experienced person.

The route of leakage between 0 and 0, which can be understood for the first time, will be explained with a diagram. FIG. 1 is an example of a button-type alkaline battery using mercury oxide. Mercury oxide pressure &1, mixed negative electrode of zinc hydride particles and alkaline electrolyte 2,
The separator 3 is internally sealed with a positive electrode case 4, a negative electrode sealing plate 5, and a gasket 6.

The alkaline electrolyte leakage path is between the sealing plate 5 and the gasket 6.
pressure contact portion 7 between the gasket 6 and the case 4; and a pressure contact portion 8 between the gasket 6 and the case 4.
They leak out to the outside 9 and 10, respectively, and gradually reach the sealing plate outer surface 11 and the case side surface 11'. Then, it absorbs carbon dioxide' from the air, turns into alkali carbonate crystals, adheres to the sealing plate and case surface, corrodes the terminal surface, and at the same time causes contact with the device terminals if it is loaded inside the device. This may cause defects or corrode equipment terminals.

In order to avoid such a situation, the present invention attempts to detect alkaline electrolyte leakage at an early stage, which has conventionally been difficult to detect with the naked eye.

3. In other words, in a battery using an alkaline electrolyte, the present invention allows a substance that changes color due to alkali to be present at least near the sealing part where the electrolyte leaks, so that the color changes immediately if the alkali leaks. By detecting this with the naked eye, it is possible to detect leakage at an early stage.

An example thereof will be explained with reference to FIG. Reference numeral 12 denotes a yellow to tan indicator layer prepared by dissolving Cresol Red Im in a mixture of 50 parts of ethyl alcohol and 60 parts of water and applying it to the periphery of the sealing part and drying it. If the alkaline electrolyte leaks from inside, this layer will immediately turn red to purple-red.

In the example shown in Fig. 2, the indicator layer is applied and formed near the sealing part, but for example, the entire battery or a necessary part may be immersed in the indicator solution, pulled up, and then dried, or the entire gasket or the outside of the gasket may be You can also apply it to the exposed surface.

In addition, in the case of cylindrical batteries or collective batteries formed by connecting multiple unit cells in series or parallel, there may be a finger on the upper surface, lower surface, or both, from which the electrolyte leaks to the outer surface.
Ci8(2) It is also a good method to interpose a ring made of cardboard or the like that has been impregnated with a liquid medicine and dried.

In addition to the cresol red mentioned above, any indicator can be used as long as it has a color reaction that is clearly different in the alkaline range than in the neutral range, such as phenol red, azolitomine (Lidomas), neutral red, and thymol. Blue, phenolphthalene, alizarin yellow, etc.

Although the present invention has been described using a mercury oxide battery as an example, it can be applied to any battery using an alkaline electrolyte.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of a conventional alkaline battery, and FIG. 2 is a half-sectional view of a button-type alkaline battery showing an embodiment of the present invention. 1...0 positive electrode, 2... negative electrode, 3...-
・Separator, 411@1111@@positive electrode case, 6・
・The number is one sealing plate, 6...0...gasket, 12...
...An indicator that changes color when exposed to alkali.

Claims (1)

[Claims] 1. An alkaline battery that includes a power generation element and uses an alkaline electrolyte, characterized in that a substance that changes color due to alkali is present at least in the vicinity of a sealing part.