JPS60148049A - Sealed battery - Google Patents

Abstract

PURPOSE:To improve the liquid leakage resistance of a sealed battery by providing convex areas on the inner and the outer surfaces of the outer bottom of a sealing packing and shifting the convex areas by applying external force during sealing so as to increase the density of the sealing packing. CONSTITUTION:A gap (B) is formed between a sealing packing 7 and a case 1. Convex areas 7a and 7b of 0.05mm.-0.10mm. thickness are provided on the inner and the outer surfaces of the outer bottom of the sealing packing 7. Because of the above constitution, the convex areas 7a and 7b of the sealing packing 7 shift during sealing of the opening of the case 1 due to external force applied during sealing thereby performing complete sealing of the battery without allowing any formation of gaps. Accordingly it is possible to increase the liquid tightness of the battery and improve its liquid leakage resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to battery cases with built-in power generating elements, such as silver oxide batteries, mercury batteries, zinc air batteries, lithium batteries, alkaline manganese batteries, nickel cadmium batteries, etc. The present invention relates to a sealed battery in which an opening is liquid-tightly sealed by a sealing plate via an insulating sealing packing.

The structure of the conventional example and its first problem show the typical structure of a silver oxide battery. In the figure, 1 is a cylindrical metal case with a bottom, and 2 is a positive electrode mixture placed at the inner bottom of the case 1, which is made by press-molding mixed powders of silver oxide, graphite, etc. Reference numeral 3 denotes a metal positive electrode ring inserted to stabilize the position and shape of the positive electrode mixture 2. 4 is positive electrode mixture 2
6 is an electrolyte-impregnated material placed on the separator 4 and impregnated with an alkaline electrolyte.

A negative electrode mixture 6 is placed on the electrolyte-impregnated material 6 and is made of a mixed powder of frozen zinc, a thickener, and the like. 7 is a ring-shaped insulating pair donkey with a cross-sectional shape.1. Made of synthetic rubber with excellent elasticity and flexibility, or synthetic resin with excellent aging resistance and mechanical strength. Reference numeral 8 denotes a single metal sealing plate in the shape of an inverted dish that closes the opening of the case 1 with an insulating pair of donkeys and a king 7 interposed therebetween, and the periphery thereof is connected to a bulge 8a in a U-shape. A folded portion 8b is provided, and a liquid backing is interposed between the sealing plate 8, the sealing lever, and the first king 7.

This is assembled into the battery case 1, and tightened by applying force to the opening from the outside.

The shape of the conventional insulating pair donkey soaking 7 and the component structure of the sealing part are as shown in FIG. Due to manufacturing issues,
The outer diameter of the sealing packing 7 is made smaller than the inner diameter of the case 1, and a gap B is provided to vent gas inside the battery before sealing.
A gap A was created at the lower part of the outer periphery of the sealing rubber, reducing the tightness of the sealing packing and significantly affecting the leakage resistance.

Purpose of the Invention The present invention eliminates the above-mentioned disadvantages by devising the shape of the sealing donkey/soaking, maximizes the liquid-tight effect of the sealing packing, and provides a sealed battery with excellent long-term leakage resistance. The purpose is to provide.

Structure of the Invention In order to achieve the above-mentioned object, the present invention has the outer and inner peripheral parts of the outer bottom of the sealing packing made thick in a convex shape,
When moving the thick part using external force, the sealing donkey...
By increasing the tightness of the knocking and obtaining a good sealing condition of the battery, leakage resistance is improved.

DESCRIPTION OF EMBODIMENTS FIG. 3 is a half-sectional view of a battery 5R44 according to an embodiment of the present invention after sealing, and FIG. 4 is a half-sectional view showing the above-mentioned configuration. The manufacturing method is exactly the same as the conventional one, and as shown in FIG. 4, it is characterized by the use of a sealing ring in which the outer peripheral part 7a and the inner peripheral part 7b of the bottom are made thick and convex.

In the configuration shown in FIG. 4, a gap B is provided between the sealing donkey and the king 7 and the case 1 as in the conventional example shown in FIG. Since the convex wall thicknesses 7a and 7b of 0.05 mm to 0.10 m are provided on the outer and inner circumferential portions of the case opening, the convex wall thickness of the sealing backing is As can be seen in the cross-sectional view after sealing in Figure 3, the first
The gap A seen in the figure can be completely filled.

This increases the liquid-tight effect and provides a battery with excellent leakage resistance.

To explain in detail the effect of the convex wall thickness of the sealing packing,
Due to the external force against the sun, the convex thick wall portion 7b on the inner circumference moves in the direction A, tightening the folded portion of the sealing plate from the inside, eliminating the gap A' in FIG. moves toward the mouth and tightens the folded portion of the sealing plate from the outside. Therefore, by making the gap between the sealing plate and the sealing locking liquid-tight as described above, the leakage resistance is improved. Another problem is that the outer circumferential convex thick part 7a also moves in the direction C, completely filling the gap A seen in FIG. In order to obtain a good sealing condition, it is possible to provide a battery with excellent leakage resistance.

The following table shows 100 each of Battery A according to the present invention and Battery B using conventional sealing packing at a temperature of 45°C.
, which shows the number of batteries that leaked when stored at a relative temperature of 90% to 96%. Note that the number of batteries in the table shows the average value of 12 repeated tests.

Effects of the Invention As described above, according to the present invention, the leakage resistance of a sealed battery is improved by using a sealing packing in which a convex thick wall portion is provided on the outer circumferential portion and the inner circumferential portion of the outer bottom portion, Reliability can be ensured.

[Brief explanation of the drawing]

1σ1 is a half-sectional view of a conventional silver oxide battery, FIG. 2 is a half-sectional view showing its component structure, FIG. 3 is a half-sectional view of a silver oxide battery according to an embodiment of the present invention, and FIG. 4 is its parts. FIG. 3 is a half-sectional view showing the configuration. 1...Battery case, 2...Positive electrode mixture, 3...
... Positive electrode ring, 4 ... Separator, 6.
... Electrolyte impregnated material, 6 ... Negative electrode mixture, 7.
... Sealing backing, 7a, 7b... Convex thick portion, 8... Sealing plate. Figure 1 Man 2 @ ρ Figure 3

Claims (1)

[Claims] A sealed battery in which a power generating element is sealed by a battery case, a sealing plate for sealing an opening of the battery case, and a sealing lever 2 interposed between the battery case and the sealing plate, the sealing lever, What is claimed is: 1. A sealed battery, characterized in that the sealing has a curved cross-section, and has convex thick wall portions on the outer periphery and the inner periphery of the outer bottom.