JPS60250569A - Vapor phase recombination catalyst device for storage battery - Google Patents

Abstract

PURPOSE:To prevent an accident caused by the electrification of static electricity by using a plug body made of synthetic resin and having static electricity conductivity for a vapor phase recombination catalyst device storing a catalyst for binding hydrogen gas and oxygen gas. CONSTITUTION:A plug body 6 is applied with conductivity by adding carbon particulates to synthetic resin such as polypropylene, for example. A palladium catalyst 8 active in the hydrogen gas/oxygen gas binding reaction is stored in an explosion-proof container 7 made by sintering alundum and having a porous structure. Even if the surface of the plug body 6 is rubbed with cotton, gauze, or chemical swabbing cloth, to electric charge is accumulated on the plug body 6, and the plug body 6 does not attain a large surface potential. Thereby, no spark discharge occurs even in the dry atmosphere at a low temperature, the maintenance work of the plug body 6 and a storage battery 1 can be performed safely, and also an accident caused by the electrification of static electricity can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a gas phase recombination catalyst device (hereinafter simply referred to as a generous device) installed in a lead-acid battery or an alkaline storage battery.

[Prior art] When a secondary battery with an aqueous electrolyte such as a lead-acid battery or an alkaline storage battery is overcharged, the electrolyte gradually decreases as water is electrolyzed and becomes hydrogen gas and oxygen gas. . As a result, the temperature of the electrolyte, dilute sulfuric acid (lead acid batteries) and caustic potash (alkaline storage batteries), increases to 111 degrees.
It has a negative effect on the battery's charging/discharging capacity and life performance. Therefore, water had to be replenished periodically, and this maintenance work was quite troublesome. In order to eliminate this drawback, when charging (
A generous device was developed that combines the generated hydrogen gas and oxygen gas using a catalyst to form a book, which is then returned to the M battery. Under conditions where the charger is continuously charged with a relatively small current, such as during float charging,
Since it can convert gas into water with an efficiency of 0.1%, maintenance is extremely simple, and it is widely used as a stationary battery as a backup power source. Conventional general pneumatic devices are porous and explosion-proof, with a cylindrical outer container made of synthetic resin such as polypropylene or epoxy resin, that is, a stopper filled with an alumina-supported catalyst with palladium attached to the surface. It has a structure in which a container is mounted, and the plug is used by attaching it to the exhaust part of a storage battery. The plug of this generous device is particularly acid resistant,
As mentioned above, it is made of synthetic resin because it requires alkali resistance, but if you rub it with cotton or foreign cloth when cleaning the stopper, it will block static electricity. For example, when a polypropylene plug is rubbed with a dry cotton cloth, the surface potential of static electricity generated on the surface of the plug easily reaches -10 kV or more. Therefore, if there is something inside the plug that can serve as an electrode, static electricity spark discharge will occur.

・As is well known (hydrogen and oxygen gases are extremely flammable gases, this spark discharge becomes the ignition source, igniting the smoldering gas and causing an explosion. This explosive energy is extremely large. , not only the device is destroyed, but the battery itself is destroyed, and the fragments and electrolyte that fly out at this time pose a danger to the human body.

[Objective/Structure of the Invention] The object of the present invention is to provide a pneumatic device that can prevent accidents caused by static electricity charging as described above, and the gist thereof is to combine hydrogen gas and oxygen gas inside the device. The main purpose of this invention is to use a stopper made of a synthetic resin having an electrical conductivity of t5 in a pneumatic device containing a catalyst.

[Example] Hereinafter, a generous portion device according to the present invention will be described using an example shown in the drawings. In the figure, 1 is a lead-acid battery or an alkaline storage battery, 2 is a positive electrode, 3 is a negative electrode, 4 (
It's an electrolyte. 5 is a generous device, and 6 is a stopper. The plug body 6 is made of a synthetic resin such as polypropylene to which fine particles of carbon are added to make it conductive, and its specific resistance is about 10-10 Ω·Cl1l. Reference numeral 7 denotes an explosion-proof container having a porous structure made of sintered alundum, and a palladium catalyst 8 active in a hydrogen gas/oxygen gas bonding reaction is housed inside the container. 9 is an opening for releasing unreacted gas. The stopper 6 used in the generous feeding device 5 of the embodiment of the present invention is made by mixing ultrafine particles of conductive carbon with polypropylene, which is an electrically insulating material, to make the polypropylene itself conductive, as described above. Therefore, even if the surface of the plug body 6 is rubbed with cotton, gauze, or a chemical rag, electric charge will not accumulate in the plug body 6.
1 plug body 6 does not reach a large surface potential. Therefore, even if the J3 is in a dry atmosphere with low humidity, spark discharge will not occur, and maintenance work on the plug 6 and storage battery 1 can be performed safely.
ζ Accidents caused by static electricity as described above can also be prevented.

In addition to the carbon shown in the above embodiments, fine particles of metal such as aluminum may also be used to impart static electricity conductivity to the synthetic resin constituting the stopper. Zarani OH-
Even if a compound with a polar group bonded to it, such as 1+ or 1+, is used, electrostatic conductivity can be imparted, although the conductivity is small.

[Effects of the Invention] As described above, the air regeneration device of the present invention can prevent accidents such as explosion and destruction of the air refilling device itself due to static electricity charging in the plug, and can also reduce maintenance work on the plug and storage battery. It has excellent advantages such as being able to.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional view showing an embodiment of a gas phase recombination catalyst device for a storage battery according to the present invention.

Claims (1)

[Claims] A storage battery characterized by using a stopper made of a synthetic resin having electrostatic conductivity in a vapor phase recombination device containing a catalyst for combining hydrogen gas and oxygen gas. - phase recombination catalytic device.