JPS58129773A - Cylindrical alkaline cell - Google Patents

Abstract

PURPOSE:To hold stability of a sealed part at sealing of a cell, umprove leakproof of liquid and prevent deterioration due to a local short-circuit during storage, by using a positive electrode ring of inverted L-shaped section provided with a thickness in the internal corner part to constitute a positive electrode part. CONSTITUTION:Desired graphite powder is firstly mixed with mercury oxide powder, an preliminary molding of this mixed powder is peformed into a hollow cylindrical shape. This molded positive electrode compound 10 is inserted into a positive electrode case 11, and then a positive eleectrode ring 12 of inverted L-shaped section is inserted into the case 11 to insert a center pin into a hollow part of the compound 10 then pressurize the compound 10 by a punch from the upper of a horizontal part of a positive electrode ring 12. And then a cylindrical separator 13 is inserted into the hollow part of the compound 10, further a negative electrode 14, in which a viscosity increasing agent is added to hardened zinc powder, and electrolyte are injected into the inside of the separator. Then an elastic packing 16 consisting of synthetic resin or synthetic rubber is mounted to the periphery of a seal plate 15 combined with a negative electrode terminal, while the plate 15 is fitted to the case 11 and sealed by tightening an opening end of the case.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alkaline battery, and more particularly to a cylindrical alkaline battery in which the positive electrode mixture has a hollow cylindrical shape.
The performance is completely improved by adding thickness to a part of the inner corner of the positive electrode ring.

The conventional cylindrical alkali has a double sealing plate and double case structure as shown in FIG. In the figure, 1 is an inner case having an outward facing flange 1a at the upper end, 2 is an outer case, and inside the case 1 is a cylindrical positive electrode mixture 3, a cylindrical separator 4 with a bottom, and a gel-like negative electrode. 5 is accommodated. Reference numeral 6 denotes a double-sealed plate, on the inside of which all negative electrode current collector rods 7 are installed. 8 is an L-shaped backing, which is attached to the flange 1 of the inner case.
1Li seat, and the rising portion is fastened between the sealing plate 6 and the opening of the outer case 2. 9 is a layer that absorbs leaked electrolyte.

When this battery was sealed, the insulating backing 8 was pressurized and compressed between the flange 1a of the inner case and the folded end of the sealing plate 6 to maintain the sealing performance. However, with this structure, the insulating backing is deformed, the sealing part is unstable, it is difficult to obtain sufficient sealing performance, and there are disadvantages in that leakage resistance is poor.

3.(; Therefore, as a solution to this problem, as shown in Figure 2, we have developed a structure in which a cathode mixture formed into a hollow cylinder is inserted into the cathode case using a sealing plate, and then a cathode ring is inserted. batteries have been proposed.

However, in a mercury battery, the density of the positive electrode part is s f/
/cJ or higher, the metallic mercury generated during discharge tends to separate from the positive electrode, which can cause internal short circuits.
It is not possible to increase the kneading strength. Therefore, due to the pressure when sealing the battery, the positive electrode ring deforms as shown in Figure 3.
The positive electrode itself was deformed and fell off, leading to performance deterioration and leakage due to instability of the sealing part, which was undesirable. In addition, if the sealing pressure is low, place an insulating backing between the positive electrode ring.

The sealing performance of the sealing plate and the positive electrode case is insufficient, resulting in the inconvenience of leakage.

In order to solve this problem, the present invention constructs a positive electrode portion using a positive electrode ring having an inverted cross-sectional shape and a portion of the inner corner thickened.

According to the invention, the stability of the sealing part is maintained when the battery is sealed, the leakage resistance is improved, and the local short 1N opening during storage is maintained.
129773 (2) Deterioration caused by tangling can be prevented.

Hereinafter, non-invention will be explained in detail using actual examples.

Here, we will describe its effects and characteristics by applying it to a mercury battery MR50 type as shown in Figure 2.

First, desired graphite powder is mixed with mercury oxide powder, and the mixed powder is preformed into a completely hollow cylindrical shape. After inserting this molded positive electrode mixture 10i into the positive electrode case 11, insert the positive electrode ring 12 with an inverted cross section into the positive electrode case, insert the center pin into the hollow part of the positive electrode mixture, and then punch the positive electrode Apply eye pressure to the positive electrode mixture from a part of the horizontal part of the ring. Thereafter, a cylindrical separator 13 is inserted into the hollow part of the positive electrode mixture, and a negative electrode 14 made of frozen zinc powder with a thickener added thereto and an electrolyte are further injected into the separator 13. Next, a sealing plate 16 that also serves as a negative electrode terminal is fitted with an elastic banking 16 made of synthetic resin or synthetic rubber around the sealing plate 16, and the sealing plate 16 is fitted into the case 11.
Tighten and seal the open end of the case. Reference numeral 17 denotes a current collector rod coupled to the inner surface of the sealing plate.

The battery according to the present invention constructed in this manner is shown in a fifth base. Shown in Figure 4.

As shown in FIG. 5, the positive electrode ring used here has an end face of a horizontal part 121L with dimension A1 and a vertical part 1 at a part of the inner corner.
A triangular thick part 120 whose one side is a line connecting the top of 2b and the inner surface corresponding to a distance of A2 is provided,
The ratio of A1 and A2 is approximately 2.0 The battery shown in Figure 1 is assumed to be C, the temperature is 45°C, and the humidity is 90%.
Leakage rate when stored for 2 weeks in an atmosphere of 1 at room temperature
The following table shows the comparison results of the remaining capacity after one year of storage.

As is clear from the above results, according to the present invention, since there is no deformation of the positive electrode ring when the battery is sealed, the sealing part is stable and capacity reduction due to liquid leakage and local short circuits during storage can be suppressed. can.

The thickness of a part of the inner corner of the positive electrode ring is preferably triangular in shape, and optimally it is in the relationship of A1 above A2. When A+<12, the volume of the positive electrode ring is too large, the positive electrode capacity decreases, and it is difficult to maintain a constant battery capacity.

In the embodiment, a nickel-plated steel plate was used as the positive electrode ring, but a stainless steel plate is also applicable.

As described above, according to the present invention, a cylindrical alkaline battery with excellent leakage resistance and storage performance can be obtained.

[Brief explanation of the drawing]

1 and 2 are cross-sectional side views of the main parts of a conventional battery, FIG. 3 is a diagram showing a state in which the positive electrode ring is deformed in the battery of FIG. 2, and FIG. 4 is a diagram of a battery according to the present invention. FIG. 6 is a side view showing the entire main part in section, and FIG. 6 is a longitudinal sectional view of the positive electrode ring. 10...Positive electrode mixture, 11. Old...Positive electrode case,
12...Positive electrode ring, 13...Separator, 14...7 ・-7 Negative electrode, 15...Seal [] 1 plate, 16...・・・
backing. Name of agent: Patent attorney Toshio Nakao Haga 1st person
1 Figure 2 Figure 13 Figure 4 Figure 5

Claims (2)

[Claims] (1) A positive electrode case, a positive electrode ring with an L-shaped cross section that covers two sides of the positive and negative electrode mix disposed inside the positive electrode case, and a seal that seals the opening of the positive electrode case. A cylindrical cylinder comprising a batten and a backing interposed between the sealing plate and the opening of the positive electrode case with the horizontal portion of the positive electrode ring as a seat, the positive electrode ring having a thickness at a part of its inner corner. alkaline battery. (2) The thickness of the part of the corner has a triangular shape with one side being a line connecting the end face of the horizontal part with dimension A1 and the inner face corresponding to a distance of A2 from the top of the vertical part, and A2
The cylindrical alkaline battery according to claim 1, which has a relationship of A1 and A2.