JPS5821780B2 - Manufacturing method of button type alkaline battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a button type battery, particularly a battery using an alkaline electrolyte, and provides a battery that is easy to manufacture and has excellent leakage resistance and discharge performance.

A conventional method for manufacturing a button battery includes, for example, an alkaline electrolyte, a glue such as CMC or sodium polyacrylate,
A gel cathode agent mixed with a cathode active material consisting of zinc hydride powder is filled into a cathode sealing plate that also serves as a cathode terminal with an insulating backing fitted around the periphery, and then an anode made of silver oxide, manganese dioxide, etc. An anode mixture containing an active material and a conductive agent such as graphite is filled into an anode container that also serves as an anode terminal, a separator is placed on top of the anode container, and the cathode sealing plate and the anode container are covered with an insulating backing. The battery was constructed by fastening it through the wire.

However, during use or storage of this type of button-type battery, the electrolyte may leak outside from the periphery of the cathode sealing plate, causing a short circuit of the battery or corroding external equipment using the battery due to the electrolyte. This caused accidents such as a decrease in battery capacity.

In addition, misalignment and shrinkage of the separator incorporated into the battery during the assembly process can cause the separator to become corrugated, resulting in poor adhesion to the anode mixture and gaps, which increase internal resistance and impair discharge performance. There were drawbacks such as a decrease in

Conventionally, in order to improve the sealing area, there was a method of sealing the cathode sealing plate and the insulating backing by fusing them using ultrasonic vibrations or by injecting various types of adhesives, but during the battery assembly process, etc. However, the electrolyte adhered to the insulating backing, impairing leakage resistance and discharge performance.

The method of the present invention improves the above-mentioned conventional drawbacks, and one embodiment will be explained below with reference to the drawings.

In FIGS. 1, 2, and 3, reference numeral 1 is an insulating backing made of plastic such as polyethylene, polypropylene, polyamide, etc., and the surface thereof is coated with a hot-melt type thermal adhesive 2 made of polyamide or vinyl acetate, for example.

This insulating backing 1 has a cathode sealing plate 3 which also serves as a cathode terminal.
The insulating backing 1 and the cathode sealing plate 3 are fitted onto the periphery 3' and fused together by heating (FIG. 1A).

Next, the inside of the cathode sealing plate 3 is filled with an alkaline electrolyte and CM.
A shell-shaped cathode material 4 made of a mixture of C glue and zinc hydrate powder active material is filled (see Figure 1).

Next, the cathode material 4 is covered with a separator 5 made of a nonwoven fabric made of polyamide, polypropylene, etc., a laminate of cellophane and nonwoven fabric, or various electrolyte holding layers, and the peripheral edge 6 is fused to the insulating backing 1 by heating (
Figure 1 c).

Next, an anode mixture 8 made of a mixture of an anode active material such as silver oxide or manganese dioxide, a conductive agent such as graphite, and a plastic binder, etc. is filled into the anode container 7, which also serves as an anode terminal, and a metal ring 9 is attached. Insert and repressurize (Figure 2).

The cathode material 4 is placed in the anode container 7 filled with the anode mixture 8.
The cathode sealing plate 3 filled with the anode sealing plate 3 is fitted through the insulating backing 1, and the opening 10 of the anode container 7 is bent and fastened inward to complete the battery (FIG. 3).

As described above, in the present invention, before assembling the cathode side with the anode side, the cathode agent 4 containing an electrolyte is filled into the cathode sealing plate 3, and the insulating backing 1 whose surface is coated with the thermal adhesive 2 is attached to the cathode. Since the separator 5 is fused and integrated with the sealing plate 3, and the separator 5 is fused to the insulating backing 1, electrolyte does not adhere to the peripheral edge 3' of the cathode sealing plate 3 or leak outside during battery assembly. Therefore, the electrolyte will not leak out of the battery during use or storage after battery assembly.

Furthermore, since the separator 5 is not displaced or deformed during assembly, there is no internal short circuit or void formation, thereby preventing deterioration of discharge performance.

Furthermore, since the fusion is performed by heating, the assembly process is simple and the adhesion is good.

Next, the battery according to the present invention (A), the conventional battery CB in which the cathode sealing plate and the insulating backing were fused together, and the conventional battery [C] in which neither the cathode sealing plate nor the separator were fused to the insulating backing were heated to 45°C. Table 1 shows the number of leakages to the outside of the battery after storage at a temperature of 90 °C and 90 °C.

In addition, the above-mentioned inventive method batteries (A, 1, conventional method batteries [B] and [C] were continuously discharged to 6.5 Ω at 20°C, and the final voltage was 1.
．． Table 2 shows a comparison of the duration characteristics and variations up to 2V.

The test batteries in both Tables 1 and 2 are WGIO type silver oxide silver oxide button batteries.

As is clear from the above table, the battery manufactured by the method of the present invention has superior leakage resistance and battery discharge characteristics compared to the conventional method.
Its industrial value is extremely large.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views illustrating steps of an embodiment of the method of the present invention, and FIG. 3 is a cross-sectional view of a battery obtained by the method. 1... Insulating backing, 2... Thermal adhesive, 3... Cathode sealing plate, 4... Cathode agent, 5... Separator .

Claims (1)

[Claims] 1 A step of heat-sealing an insulating backing whose surface is coated with a thermal adhesive to the periphery of the cathode sealing plate, a step of filling the inside of the cathode sealing plate with an electrolyte-containing cathode material, and a step of applying a separator to the insulating banking. A process of heat-sealing and coating the cathode agent, and fitting the cathode sealing plate filled with the cathode agent into the anode container filled with the anode mixture via an insulating backing, and also turning the opening of the anode container inward. A method for manufacturing a button-type battery, comprising the steps of bending and tightening the battery to seal the battery.