JPS5834565A - Manufacture of silver (ii) oxide battery - Google Patents

Abstract

PURPOSE:To obtain a silver (II) oxide battery which has a high capacity and a stabilized operational discharge voltage. CONSTITUTION:In the figure, the symbol 1 represents a positive case made of a metallic member the entire surface of which is plated with nickel, and the symbol 2 represents a formed body made of a positive mixture, which principally consists of silver dioxide and contains a slight amount of a binder and no conductive members. A thin reducing surface 3 is formed on the surface of the formed body 2, which faces to a negative electrode, by a light irradiation or the like. Next, after an insulating plate 5 is laid on the bottom surface of the case 1, the formed body 2 the side surface of which is provided with an insulating tube 4 is inserted into the case 1 so that the surface 3 faces to the negative electrode. After that, an L-shaped metallic ring 6 the entire surface of which is plated with silver is inserted into the case 1 so that the inner surface of the upper horizontal part 7 of the ring 6 touches the reducing surface 3. Since the L-shaped metallic ring 6 is used as a current collecting body as mentioned above, the wide contact area collects the electric potential of argentous oxide existing in the reducing surface 3, and the collected electric potential is transmitted from the outer surface of a vertical part 8 to the wide contact area of the case 1 through silver. Consequently, a battery which has a small internal resistance and can produce an operational voltage of 1.55V, which is the same as that of an argentous oxide battery, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention #4 relates to a method for filling a molded body of an anode mixture such as silver divalent oxide into an anode container.

Conventionally, this type of alkaline battery was made by mixing divalent dispersion steel number, a conductive material, and a binder, molding it, and filling it with anode (double pressure). However, this type of battery had an initial discharge operating voltage of about 1
．． 8V, 1.55V below the middle stage, and the voltage difference between the early stage and the middle stage of discharge is about 0.25'V, and the disadvantage is that it is not suitable as a power source for high-performance devices such as electronic watches because of the large step. there were. For this reason, research has been conducted on an approximately 1.5V type silver divalent oxide battery that uses divalent silver oxide to maintain high capacity and has no voltage step during discharge. This is an anticathode surface 1 of the anode mixture molded body: The purpose was to form a reduction layer to eliminate voltage aberration and obtain high discharge capacity, but the surface of the divalent silver oxide mixture molded body The majority of the electrode is covered with an electrical insulator, and only the side surface of the reduction layer contacts the anode container and collects current.

For this reason, the current collecting area is extremely small and the internal resistance of the battery is large, or even slight variations in the height of the insulator may cause no current to be collected at all, or the internal resistance of the battery may become extremely large. However, if the height is not sufficient, the silver divalent oxide and the anode container come into contact with each other, resulting in a high operating voltage and a step difference.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and to obtain a high-capacity silver divalent oxide battery with a stable discharge operating voltage.

An embodiment of the present invention will be explained with reference to FIG.

1 is an anode container made of metal plated entirely with nickel; 2
is a molded body made of an anode mixture containing a living substance such as silver divalent oxide and a small amount of a binder but no conductive material added, and a thin reducing surface 3 is formed on the anticathode surface by irradiation with light or the like.

Reference numeral 4 denotes an insulating tube, which is made of elastic synthetic resin such as soft polyethylene, and has a thin cylindrical shape that covers and insulates the side surface of the molded body 2.

In addition, a heat-shrinkable insulating tube having an inner diameter slightly larger than that of the molded body 2 can be reduced and shrunk by the heat of the light irradiation, and can also be used to cover and insulate the sides. The molded body 1 having the insulating tube 4 on the side surface is inserted into the anode container 1 so that the reducing surface 3 faces the cathode. Furthermore, the vertical s8 is inserted between the anode container 1 and the insulating tube 4 so that the inner surface of the upper horizontal part 7 of the 5-shaped metal ring 6, which is entirely plated with steel, is in contact with the reduction surface 3, and the whole is heated. The anode container 1 is filled under pressure. Upper surface 1 of the reducing surface 3 Barrier 9 made of Nicerophane or cellophane and microporous polyethylene/film laminated thereto
A senolator 11 made of a non-woven fabric 10 is inserted, and an insulating gasket 12 made of a synthetic resin such as nylon or polyethylene is fitted on the upper surface of the C false separator 11 (2).

13 is a metal sealing plate filled with a gel cathode 14 made of a mixture of gelling agent powder of sodium polyacrylate or carboxymethyl cellulose, an alkaline electrolyte made of caustic potash or caustic soda, etc., and zinc powder. The battery is sealed by fitting the peripheral edge of the metal sealing plate 13 into the anode container I via the insulating gasket 12, and bending the opening inward C twice.

In the present invention, since the five-figure metal ring 6 is used as a current collector, the entire surface is silver plated, and the inner surface of the upper horizontal part 6 is brought into contact with the reducing surface 3, so that the potential of monovalent silver oxide (Ayso) on the reducing surface 3 is The insulating tube 4
Even though the insulating plate 5r□I slave body 2 is insulated and exposed, the internal resistance of the battery is small, and the operating voltage of 1.55V, which is the same as that of -valent oxidized scissors (Afjg○), can be extracted. It is something.

In addition, as the discharge reaction of the C-battery progresses during use, the reducing surface 3 gradually becomes thicker in a layered manner, and in particular, the reducing surface of the molded body 2 in contact with the inner surface of the horizontal portion 7 is affected by the discharge.
Proceed until. Metallic silver is also a good electrical conductor, so it acts as a current collector, further reducing internal resistance.

Therefore, it is possible to eliminate the gradual drop in the discharge operating voltage that occurs at the end of discharge.

Further, in the present invention, an insulating plate 5 is laid on the bottom of the anode container 1 to insulate it from silver divalent oxide, and the insulating tube 4 is
If a soft and elastic electrical insulating material such as synthetic rubber or synthetic resin is used, filling the molded body 2 into the anode container 1 under pressure may cause it to break, cause dielectric breakdown, and come into contact with silver divalent oxide. do not have. In the case of a small battery, even if the height of the small cylindrical insulating tube 4 varies to some extent, it is held down by the inner surface of the horizontal s7 of the 5-shaped metal ring 6, contracts due to elasticity, and the vertical portion 8 Completely connect the inner surface and the side surface of the molded body 2 (:
It can be insulated and does not come into contact with divalent silver oxide (Ayo) of the molded body 2. Furthermore, since the current collection of the anode is performed on the inner surface of the horizontal portion 7, the influence W of the above-mentioned height variation is not affected at all.

Furthermore, since divalent silver oxide is used as a living material and has a reduction surface 3 of monovalent silver oxide, and the discharge reaction proceeds in a layered manner from the reduction surface 3, it is also possible to not use a conductive material in the molded body 2. It is possible to obtain stable discharge performance with large capacity at the same operating voltage as -valent oxidation. Furthermore, by using a heat shrinkable tube made of material C of the insulating tube 4, the insulating tube 4 of the side surface of the molded body 2 can be shrink coated at the same time as the molded body 2 is reduced by light irradiation.

Next, a button-type silver divalent oxide battery of the present invention with an outer diameter of 6.8 us and a thickness of 26 cm using a silver-plated L-shaped metal ring, a soft insulating tube 4, and an insulating plate 5 [phantom, We made 200 prototypes of each of the conventional products (B) of the same shape, in which insulators were simply applied and dried on the sides and bottom of the molded body, and the inside of the battery was tested at a closed-circuit voltage of 15Ω and an alternating current of 1'KH2. Resistance, 15Ω
The gas capacity of the group 1t11 and the respective variation widths were determined and shown in the table. Further, discharge curve C: clear 1; the number of batteries in which stages occurred is shown as a percentage.

As shown in the table above, the C1 invention product (A) has good stability in closed circuit voltage, has a small internal battery, and is stable. moreover,
The discharge capacity was large, and there were no steps at all. This is because the current collecting area is large, the contact resistance is low, and the insulation with divalent silver oxide is perfect.

As described above, the divalent oxidation SIT cell of the present invention has low internal resistance, good workability, high violet capacity, and stable and excellent discharge performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a button-type silver divalent oxide battery, which is an embodiment of the battery of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the same battery.

Claims (2)

[Claims] (1) A reducing surface is formed on the anticathode surface of an anode mixture molded body containing silver divalent oxide (4PO) as a living substance, and the side surface of this molded body is horizontally covered with an insulating tube. The above-mentioned molded body is inserted into the anode container on which the upper horizontal part of the L-shaped metal ring is placed, and the inner surface of the upper horizontal part of the L-shaped metal ring comes into contact with the above-mentioned reducing surface 6, the outer surface of the peripheral part of the lower part contacts with the anode container, and the inner surface of the vertical part contacts with the above-mentioned reducing surface 6. 1. A method for producing a silver divalent oxide battery, which comprises inserting a metal ring between an anode container and an insulating tube so that the formed body is insulated by the insulating tube, and filling the battery with pressure. (2) The method for producing a silver divalent oxide battery according to claim 1, wherein the KL-shaped metal ring is made of silver, gold, or platinum, or is plated with them. (Silver divalent oxide according to claim 1 or 2, wherein the 81# insulating tube is made of an alkali-resistant synthetic rubber or synthetic resin matrix having electrical insulation properties and elasticity. Battery manufacturing method.