JPS601752A - Button cell - Google Patents

Abstract

PURPOSE:To improve the leak-proof performance by previously pressing the circumferential rising section of a negative pole sealboard then cutting to predetermined height. CONSTITUTION:A sealboard formed with copper 1, basic material or stainless steel 2 and nickel 3 is pressed such that the circumferential rising section (A) will be longer than the final dimension then said rising section (A) is grinded or cut to predetermined height. The negative pole sealboard 4 produced in such a manner has the rising section made of basic material or stainless steel 2 and maintained vertical to improve the withstandability against the fastening pressure when constructing a cell and to prevent deformation of sealboard 4 resulting in improvement of leak-proof performance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in button batteries using alkaline or organic electrolytes.

Conventional Structures and Problems Due to advances in electronic technology in recent years, the shape of button batteries has become increasingly smaller and thinner.In addition, the leakage resistance of batteries has improved as the equipment used has become more precise. As they become more expensive, there is a strong demand for high reliability.

Page 2 In order to meet these market demands, products with button-shaped batteries whose total height is less than 2.0 mm, called 1.6 mm or 1.0 mm, have been developed.

It is necessary to set the diameter to 0.7 mm.

Figure 1 shows a 5R916S silver oxide battery with a total height of 1.6 mm.
A partial sectional view of the negative electrode sealing plate of W is shown.

The height of this sealing plate is 0.8 mm, and its material is copper 1.
゜It is made of a three-layer cladding material of stainless steel 2 and nickel 3, and the thickness of the cladding material is 0.2 mm.

A in the figure is the rising edge of the periphery, and its height is 0.3+mn
It is. Note that dimensions such as the height of the sealing plate, the rising height of the peripheral edge, and the thickness of the cladding material are shown as an example of a thin battery.

In the sealing plate having the shape described above, since the height of the rising part of the peripheral edge is low, it is difficult to make the base material stainless steel rise at an acute angle and ensure verticality in the rising part. Ah, page 3.

For this reason, as shown in Figure 2, in the final pressing process of the negative electrode sealing plate, a layer of copper 1 with good malleability is pounded out, and the copper layer increases the verticality of the raised part and the distance between the vertical parts. An attempt was made to do so.

In a button battery using such a negative electrode sealing plate, the shape of the rising edge of the stainless steel base material becomes vertical, so it is difficult to resist external pressure applied when the battery is sealed. On the other hand, the strength was low, which caused a decrease in the battery's leakage resistance.

OBJECTS OF THE INVENTION The object of the present invention is to obtain a battery with excellent leakage resistance by improving the negative electrode sealing plate of a thin button battery.

Structure of the Invention In order to achieve the above object, the verticality of the rising part is ensured by press-working the rising part of the peripheral edge of the negative electrode sealing plate into a long length in advance, and then setting the rising part to a predetermined height. It is characterized by:

DESCRIPTION OF EMBODIMENTS Below, the negative electrode sealing plate used in the button-type battery of the present invention will be explained with reference to the drawings. Figure 3 shows copper 1. This is a sealing plate made of a three-layer clad plate made of stainless steel 2 and nickel 3, which is the base material of the sealing plate, and the rising edge 9 A of the sealing plate is larger than the dimension of the rising 9 part at the time of final use. It is long and press-molded.

FIG. 4 shows a high portion of the peripheral rising portion A of the sealing plate shown in FIG. 3 which has been processed to a predetermined height by polishing, cutting, etc.

In the negative electrode sealing plate obtained in this way, the shape of the rising part of the stainless steel 2, which is the base material of the sealing plate, is ensured vertically, and the strength against the clamping pressure during battery construction is improved, and the sealing plate is This prevents deformation and improves leakage resistance as a battery.

It should be noted that whether or not the negative electrode sealing plate according to the present invention is a negative electrode sealing plate according to the present invention can be easily determined by tearing off the rising portion of the peripheral edge and examining the verticality of the stainless steel base material.

Next, a silver oxide battery 5R916SW with the structure shown in FIG. 5 using the negative electrode sealing plate 4 according to the present invention was created, and the leakage resistance was compared with the same type of battery using the conventional negative electrode sealing plate shown in FIG. 1. The comparison yielded the following results.

In addition, the total height of the sealing plate for each battery. , 8 pharynx.

The height of the rising part is 0.3 mm, the thickness of the three-layer clad material is 0.2 mm, and the height of the sealing plate of the present invention when press-formed before cutting is 0.6 mm. 0 of
, with a height of 3 mm. 5 in Figure 6 is the positive electrode case;
6 is a positive electrode mixture, 7 is a positive electrode ring, 7 and 8 are separators,
9 is a zinc negative electrode, and 1o is a gasket.

Test) A is the number of leaks after being left at a temperature of 45℃ and humidity of 90% for 1000 hours, page 6Test) B is the number of leakages after being left for 500 hours at a temperature of 60℃ and a humidity of 90%. It was confirmed that the invented battery had excellent leakage resistance.

In addition, the negative electrode sealing plate with a height of 1.0+mn or more and a sealing plate with a peripheral edge rising part height of 0.5mm or more have a long bending length at the peripheral edge rising part, so it is difficult to use the base material. Some stainless steels can also be bent well and there is no need to employ the method of the present invention.

Effects of the Invention As described above, the present invention can improve the leakage resistance of a button type battery having a total height of 2 gourds or less.

[Brief Description of the Drawings] Figures 1 and 2 are partially enlarged cross-sectional views of the negative electrode sealing plate in a conventional button-type battery, and Figure 3 is a button-type battery according to an embodiment of the present invention in which the rising edge of the periphery is lengthened. Figure 4 is a partially enlarged cross-sectional view of a negative electrode sealing plate, and Figure 4 is a partial enlarged cross-sectional view of a negative electrode sealing plate with the raised peripheral edge at a predetermined height. FIG. 1... Copper, 2... Stainless steel as base material, 3... Nickel, 3...
Negative electrode sealing plate, A... Peripheral rising portion, 6...
...Positive electrode case, 6...Positive electrode mixture, 9...
...Negative electrode zinc. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 3

Claims (2)

[Claims] (1) A button-shaped battery using a negative electrode sealing plate in which the rising edge of the peripheral edge of the negative electrode sealing plate is pressed long in advance, and then the rising edge is polished or cut to a predetermined height. (2) The button-shaped battery according to claim 1, wherein the height of the negative electrode sealing plate is 1.0 mm or less, and the height of the rising portion of the peripheral edge is 0.5 mm or less.