JPS59112566A - Alkaline battery - Google Patents

Abstract

PURPOSE:To provide the captioned battery excellent in fluid leakage tightness by using nylon having a specific structural formula and obtained by polycondensating methaxylene diamine and adipic acid, as an insulating packing for separating a positive electrode terminal from and a negative electrode terminal. CONSTITUTION:A cylindrical insulating packing 4 on one end of which a flange part 4a is formed is inserted into a positive electrode vessel 1 from the opening part of said vessel filled with a positive electrode black mixture 2, in a flat type silver oxide-zinc alkaline battery, etc. An insulating packing obtained by molding nylon MXDA having a structural formula and obtained by polycondensating methaxylene diamine and adipic acid is used as said insulating part 4. And, a negative electrode active material 6 is laminated on an electrolyte holding body 5 by fitting a negative electrode sealing body 7 in the above described insulating packing 4. The nylon MXD has those favorable features such small rate of water absorption, high glass transition point, high bending strength, and small thermal expansion coefficient, thus enabling an alkaline battery excellent in fluid leakage tightness to be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an Alka IJ-4 pond with an improved insulating backing for insulating and isolating an anode terminal and a cathode terminal.

In general, the alkaline core pond is made by filling the anode active material so that it is in contact with the bottom of the anode container, which also serves as the anode terminal, and placing an ion-permeable 14III# model on top of the alkaline core dissolving liquid retaining material. (This should be in contact with the inside of the anode container.)
Insert this cylindrical insulating backing.

After fitting a cathode sealing member, which also serves as a cathode terminal and filled with a cathode active material, into this insulating packing, the open end of the positive container is curled to complete the process.

However, if you store this alkaline battery for a long time in November or use it in a device that uses it.

Due to the creeping phenomenon of the alkali solution, positive ions migrate to the surface of the cathode sealing body, and the solution leaks from the periphery of the cathode sealing body. If this electrolyte forms a layer on the electrode terminals or circuits of devices that use batteries, it may cause corrosion and cause malfunctions, or the electrolyte may leak out (this may cause accidents such as a decrease in the capacity of the 111 pond). was.

Conventionally, in order to prevent such leakage accidents.

Chloroprene, as an insulating backing material.

Styrene-butadiene rubber, polyethylene, polypropylene, nylon 6, nylon 66, etc. are used.

Each of these insulating materials has its own advantages and disadvantages, and has not been able to exhibit sufficient leakage resistance.

In particular, nylon backings such as nylon 6 and nylon 66, which are commonly used as insulating backing materials, have recently been widely used as insulating packings for alkaline batteries. However, this nylon-based material has water absorption properties unique to nylon.

Strength and performance: Decrease in vitality 2 Various changes such as dimensional changes 1.
I'm giving birth to a demon.

When compressing the insulating backing by curling the open end of the anode container, increasing the compression ratio to more than 50 modulus will easily damage the insulating backing and cause the electrode and cathode to be damaged. Along with short circuiting.

Magnetic liquid leaks through the damaged part. In addition, the insulating backing expands due to water absorption, making it difficult to insert the cathode storage body.
There were problems such as yelling.

In order to solve these problems, various methods have been devised for drying nylon-based insulating backings. This drying method is disclosed in Japanese Patent Publication No. 1983-F3371.
-6372, 56-6373, etc. are being proposed.

However, this method, which is equipped with a means for drying the insulating backing, has the disadvantage that the drying process is increased, requiring additional man-hours, and the equipment is expensive.

Moreover, if the insulating backing is left in the air, the moisture contained in the air will be absorbed, so the humidity in the factory or storage area must be controlled to keep the insulating backing dry at all times. That is extremely difficult.

This invention was made to solve the above-mentioned problems, and is obtained by polycondensing meta-xylene diamine and adipic acid on an insulating backing that provides an insulation distance between an anode terminal and a cathode terminal. NH-cH2-Q-CH2
By using nylon (hereinafter referred to as nylon MXDA) having the structural formula -NHCO-C, [46-CO9-n -0H2], an alkaline battery with excellent leakage resistance is provided.

A humorous example of the present invention will be described below with reference to one drawing.

FIG. 1 shows the invention applied to a flat type silver oxide-zinc alkali IJ4 pond. In the figure, reference numeral 1 denotes an anode container made of nickel-plated iron that also serves as an anode terminal, and is formed into a short cylindrical shape with a bottom. At the bottom of this anode container 1, an anode mixture 2 formed into a disk shape by adding graphite to a silver oxide active material as a conductive material is filled in the above group <: 1, and on top of it a microporous polyethylene An ion-permeable isolation layer 3 made of cellophane laminated on both sides is overlaid. And anode container l
A cylindrical insulating backing 4 having a flange 4a is fitted into the opening thereof. This insulating backing 4 is made by molding nylon MXDA having the structural formula %, which is obtained by polycondensing meta-xylene diamine and adipic acid.

On the other hand, on the top of the ion-permeable isolation plate 3, a disk-shaped 1d decomposition liquid holder 5 made of a porous fibrous material containing an aqueous solution of caustic potash or bamboo soda is superimposed. Furthermore, a cathode sealing body 7F formed by mixing amalgamated zinc powder with a layer of amalgamated zinc powder and a caking material (for example, carboxymethyl cellulose, polyvinyl alcohol, etc.) is filled thereon. By fitting the cathode opening body 7 into the insulating backing 4, the cathode active material 6 is laminated on the four-liquid holding body 5.

Finally, the openings of each anode layer 1 are tightened inward, the insulating backing 4 is compressed by one inch, and the openings between the anode container 1 and the cathode sealing body 7 are sealed, thereby completing the alkali tank.

Nylon MXDA used as the material for the above-mentioned insulating backing is a polyamide resin having phenyl groups in the molecular chain obtained as a condensate of meta-xylene diamine and adipic acid. The properties of this nylon MXDA and those of nylon 6 and nylon 66 are shown in the table.

Table As can be seen from this table, nylon ~ DA has a lower water absorption rate than nylon 6 and nylon 66.

It has features such as high glass transition point, high bending strength, high bending modulus, low thermal expansion, and low attack.

In total, phenyl groups are present in the molecule and 0 molecules are 1-1
It can be seen that the linearity is large.

By the way, the diameter of the silver oxide-lead alkaline deer made up of this ship is 7. Q mm, height 2.1 mm button batteries were used, and 200 of each were stored in a constant temperature bath with a damp skin of 90 cm at a room temperature of 60°C for 2 months to check for leakage compared to the case of conventional products. When served as a side dish, a comparison diagram of leakage resistance characteristics shown in FIG. 2 was obtained. In this comparison diagram, graph A indicates product A of the present invention using insulating backing (nylon MXI) A;
Graph B is a conventional product B that uses nylon 66 for the edge banking, and graph C is an insulating backing made of nylon 610.
Graph D shows the leakage resistance of conventional product 1), which uses polypropylene for the insulating backing.

According to this comparison diagram of leakage resistance characteristics, 1. Alkaryl cell A of the present invention has extremely better leakage resistance characteristics than conventional products C and D, and battery B uses nylon 66, which has been well-established as a high-quality insulating backing material. In this case, the reason is that nylon M
Since the water absorption rate of , Nylon MXDA itself (this can reduce the amount of moisture sucked in. This allows the I(+ ions in the cicada fluid to be reduced).

This is thought to be because Na+ ions and OH- ions spread through the water and become thicker.
) CI) k's flexural modulus is better than that of other nylons.

This is because the compressibility of the insulating backing 4 can be increased to achieve good sealing between the anode container 41 and the cathode sealing body 7.

Moreover, nylon MXDA has a small thermal resistance.

This is because distortion is small against temperature changes, and gaps are less likely to form between the insulating backing 4 and the cathode body 7 or the anode container 1.

As described above, according to this invention, the anode terminal and the cathode terminal can be connected to each other. It is obtained by polycondensing meta-xylene diamine and adipic acid onto an insulating backing.

"t((-NH-cI(2-(:) -CE(2-NH
By using nylon L\(XJ)A having a structure formula of CO-C, Be able to do it.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications within the scope of the gist.

It goes without saying that this invention can be applied not only to silver batteries but also to other alkaline batteries.

[Brief explanation of the drawing]

- Figure 1 is a vertical sectional view showing one embodiment of the present invention.・Mantle 21" has a resistance (
This is a diagram of the night bite time ratio. 1... Anode container 2... Anode mixture 3... Ion-permeable isolation pattern 4... 7 Edge banking 4a... Flange 5... Patric acid liquid holder 6... Cathode active material 7...Cathode sealing body

Claims (1)

[Claims] In an alkaline battery that is sealed by interposing an insulating backing between the anode container surface and the cathode sealing wood, which also serves as the anode terminal,
Structural formula m6NH-ct obtained by polycondensing meta-xylene diamine and adipic acid as the above-mentioned insulating backing
q2-0-CH2-NHCO-C,) (6-COchinn0
An alkaline battery characterized by using nylon having HJ.