JPH0831394A - Manufacture of flat alkaline storage battery - Google Patents

Abstract

PURPOSE:To improve the liquid leak resistance of a battery by applying sealing material to the portion of a sealing plate put in contact with an insulating gasket, drying it and fitting the sealing plate into the insulating gasket for heating and welding into one unit. CONSTITUTION:Sealant 3 with polyamide based resin dissolved in toluene and isopropyl alcohol is applied to the portion 1a of a sealing plate l also serving as a negative terminal put in contact with an insulating gasket 2 and solvent for the sealant 3 is dried and completely removed. Then, the sealing plate 1 is fitted into the insulating gasket 2 to which the sealant 3 with polyamide based resin is previously applied all over, for heating and welding into one unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat alkaline battery.

[0002]

2. Description of the Related Art A conventional method for manufacturing a flat alkaline battery will be described with reference to FIG. A sealing agent 3 prepared by dissolving a polyamide resin in toluene, isopropyl alcohol or the like is applied to a portion 1a of the sealing plate 1 which also serves as a negative electrode, which is in contact with the insulating gasket 2, and immediately inserted into the insulating gasket 2 made of nylon 66, and then heated. The negative electrode active material 4 is filled in the fused and integrated product. On the other hand, the container 5 also serving as the positive electrode terminal
An alkaline battery was manufactured by inserting an integrated product in which the negative electrode active material 4 was filled into a product in which the positive electrode active material 6, the separator 7, and the liquid retaining agent 8 were placed, and then sealing the product with a sealing die. .

However, in the conventional battery manufacturing method, the sealing agent 3 is applied to the portion 1a of the sealing plate 1 which also functions as the negative electrode terminal and which contacts the insulating gasket 2, and then immediately fitted into the insulating gasket 2 and heat-fused. When the sealing agent 3 is brought into contact with the insulating gasket while being undried, a part 3a of the sealing agent 3 is extruded as shown in the figure.
The adhesion between a and the insulating gasket 2 was insufficient.
Further, when incorporated in a battery, the contact between the sealing plate 1 and the insulating gasket 2 between the location 1a and the insulating gasket 2 is insufficient, so that the electrolyte creeping phenomenon may occur and sufficient leakage resistance may be exhibited. There was a problem that I could not.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a polyamide resin is dissolved in toluene or isopropyl alcohol at a position where it comes into contact with a sealing plate which also serves as a negative electrode terminal and an insulating gasket. After applying the sealant, the solvent of the sealant is removed by drying, and then the sealant is inserted into the insulating gasket in a uniform state, and heat fusion is integrated into a flat alkali with excellent leakage resistance. It is intended to provide a battery.

[0005]

In order to achieve the above object, the present invention is to apply a sealant obtained by dissolving a polyamide resin in toluene or isopropyl alcohol to a portion of the sealing plate which also serves as a negative electrode terminal, in contact with an insulating gasket. In the method for producing a flat alkaline battery, which is filled with a negative electrode active material after being heat-fused and integrated, and is inserted into and sealed in a container that also serves as a positive electrode terminal in which a positive electrode active material, a separator and a liquid retention agent are disposed, A sealant having a polyamide resin dissolved in toluene and isopropyl alcohol is applied to a portion of the plate that is in contact with the insulating gasket, and then the solvent of the sealant is removed by drying, followed by heat fusion.

[0006]

According to the present invention, the sealing agent is applied to the portion of the sealing plate that also serves as the negative electrode terminal, which is in contact with the insulating gasket, and then the sealing agent is dried to prevent the sealing agent from contacting the sealing plate and the insulating gasket. Even after being uniformly applied, fitted into an insulating gasket, and heat-fused to be integrated, it exhibits sufficient adhesion. Further, when incorporated into a battery, since the sealing plate and the insulating gasket are sufficiently adhered to each other, it is possible to suppress the phenomenon of the electrolyte crawling up, and there is a sufficient effect on the leakage resistance of the battery.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a sealing plate which also serves as a negative electrode terminal, 2
Is an insulating gasket, 1a is an insulating gasket 2 of the sealing plate 1.
3 is a sealant obtained by dissolving a polyamide resin applied to the sealing plate 1 in a solvent such as toluene or isopropyl alcohol, 4 is zinc hydride having a conversion rate of 10%, and a set amount of polyacrylic acid and A negative electrode active material in the form of a gel by mixing an aqueous NaOH solution having a predetermined concentration in which zinc oxide is dissolved,
5 is a container that also serves as a positive electrode terminal, 6 is a positive electrode active material formed by pelletizing silver oxide (Ag ₂ O), 7 is a separator obtained by laminating a graft-polymerized microporous polyethylene film and cellophane, and 8 is acetalization A non-woven fabric of polyvinyl alcohol fiber, which is impregnated with an aqueous solution of NaOH in which zinc oxide is dissolved.

In the present invention, as shown in FIG. 1, a portion 1a which abuts on the insulating gasket 2 of the sealing plate 1 which also serves as the negative electrode terminal.
After applying a sealant prepared by dissolving a polyamide resin in toluene and isopropyl alcohol, the solvent in the sealant was completely dried by drying. After that, the sealing plate 1 is fitted into an insulating gasket 2 coated with a sealing agent made of polyamide resin in advance, and the temperature is set to 150 ° C.
-Heating and fusion were performed for 3 seconds and integrated.

In addition, as a comparative example, a sealing agent made of a polyamide resin is immediately applied after applying a sealing agent in which a polyamide resin is dissolved in toluene and isopropyl alcohol to a portion 1a of the sealing plate 1 which is in contact with the insulating gasket 2 according to a conventional method. Was put into an insulating gasket 2 coated on the entire surface, heat-fused, and integrated to manufacture simultaneously.

Next, 50 batteries of the battery according to the present invention and 50 batteries of the comparative example according to the conventional method were experimentally produced and tested for the number of liquid leaks. The storage condition is 45 ° C-93%.

[0011]

[Table 1]

[0012]

As described above, according to the present invention,
Since the sealing agent is applied to the portion of the sealing plate that also serves as the negative electrode terminal in contact with the insulating gasket, the solvent of the sealing agent is removed by drying, and then the insulating gasket is fitted and integrated by heating and fusion. Can significantly improve the leakage resistance of the battery.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional flat alkaline battery.

[Explanation of symbols]

1 ... Sealing plate also serving as a negative electrode terminal, 2 ... Insulation gasket, 1
a: a portion where the sealing plate contacts the insulating gasket, 3 ... sealing agent, 4 ... negative electrode active material, 5 ... container 5 also serving as a positive electrode terminal,
6 ... Positive electrode active material, 7 ... Separator, 8 ... Liquid retention agent.

Claims (1)

[Claims] 1. A sealing agent having a polyamide resin dissolved in toluene and isopropyl alcohol is applied to a portion of the sealing plate which also serves as a negative electrode terminal, which is in contact with the insulating gasket. Filling, positive electrode active material, separator, in the method for manufacturing a flat alkaline battery which is fitted and sealed in a container that also serves as a positive electrode terminal in which a liquid holding agent is arranged, a polyamide-based resin is applied to a portion contacting the insulating gasket of the sealing plate. A method for manufacturing a flat alkaline battery, comprising applying a sealing agent dissolved in toluene or isopropyl alcohol, and then drying the solvent of the sealing agent to remove the solvent, and then heat-sealing.