JPS62264552A - Clad material for button battery - Google Patents

Abstract

PURPOSE:To enable to realize the same effect as gold plating by using a 3-layer clad material of Cu/SUS/Cu-Zn-Al alloy, in a specific formation range and with a specific thickness ratio, for a negative electrode sealing plate. CONSTITUTION:A clad material is of a 3-layer structure with a Cu layer 8 on one side a SUS layer 7 and CU-Zn-Al gold colour alloy layer 9 on the other side. Formation of Cu-Zn-Al alloy layer then to be 2.7-36% of Zn and 3.8-6.5% of Al, respectively, from view of holding golden color and ability. On the other hand, a thickness ratio of the 3-layer clad layer is to be 87-68% of SUS layer from the perfect sealing surface of an active material. And from view fof a thickness to withstand pressing process and a thickness for making conductivity equivalent to that of the conventional Ni layers,. the thicknss ration are set to 8-20% of Cu layer and 5-12% of Cu-Zn-Al alloy respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cladding material for button batteries that is useful as a sealing plate for the cathode of button batteries (or micro batteries).

[Prior Art and Problems] A button battery having a cross-sectional configuration as shown in FIG. 1 is widely used as a power source for thin calculators with liquid crystal display, electronic watches, automatic control of cameras, IC lighters, etc. A positive electrode active material (silver oxide) 41 and a negative active material (zinc) 43 are housed in a battery container 3, which also serves as a positive electrode terminal, through a separator 42 that holds an electrolyte, and are placed through an insulating packing 2. It is an extremely small battery sealed with a cathode sealing plate 1 and seemingly button-shaped.

Therefore, as the cathode sealing plate 1, a three-layer cladding material of CI/3113/old (SUS is stainless steel, the same applies hereinafter) has conventionally been mainly used. This is because when used, electrical properties, mechanical strength, and corrosion resistance are well balanced.

However, recently, the main purpose of the above-mentioned product is to give an image of a high-class product in terms of appearance, and at the same time, the above-mentioned Gold plating on 140 boards is becoming more and more common. That is, FIG. 3 shows an enlarged sectional view of the above-described conventional structure of the circle-marked part of the cathode sealing plate 1 in FIG. A gold plating layer 5 is formed on the N1 layer 6 located on the outer surface side.

However, it is extremely rare that the gold plating 5 is applied in such a battery where there is a particularly strong demand for a stable reduction in contact resistance on the cathode side. Applying very expensive gold plating just for this purpose would be considered over-processing, and it is possible to replace the expensive gold plating with an inexpensive one that can be expected to have the same effect as the gold plating. There was a great demand for the appearance of cathode sealing plates.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and instead of gold plating, which leads to a large increase in material costs, the above-mentioned gold plating can be achieved by using a predetermined gold-colored alloy. It is an object of the present invention to provide a cladding material for a cathode sealing plate of a button battery that can exhibit the same effects as those of the present invention.

[Summary of the Invention] In other words, the gist of the present invention is that instead of the four-layer structure including the gold plating layer of the conventional example, a three-layer cladding of Cu/5tlS/Cu-Zn-Al alloy is used as the cathode sealing plate. By using materials in a predetermined composition range and a predetermined thickness ratio, it was possible to provide a similar cathode sealing plate with a golden yellow surface and good workability without applying gold plating. .

[Example] This will be explained below based on examples.

FIG. 2 is an enlarged sectional view of the portion marked with a circle in FIG. 1, in which the cladding material according to the present invention is used as the cathode sealing plate 1 of FIG. 1. The clad material according to the present invention does not have a four-layer structure as shown in FIG. 3, but has a three-layer structure in which one of the 808 layers 7 is clad with a 00 layer 8, and the other is clad with a gold-colored Cl-Zn-Al alloy layer 9. Become. However, since the Cu-Zn-Al alloy layer 9 itself exhibits a golden color, it appears to be gold at first glance.
By providing this on the outer surface side of the sealing plate 1, the aforementioned preference for luxury goods and polarity discrimination ability can be fully exhibited.

However, in order to match the golden color preference mentioned above, Cu
The composition range of the -Zn-Al alloy is not limited to any range, but there is a certain composition range for that purpose.

FIG. 4 is an explanatory diagram showing the composition range on the Cu side in the ternary system phase diagram of the Cu-Zn-Al alloy. In the same figure,
The shaded range is a range where red is so strong that the appearance deviates from golden yellow, and is a range that does not meet the intended purpose of the present invention. When both Zn and Al are added in a predetermined amount or more, a desirable golden color is exhibited, but if the amount added is too large, workability deteriorates, making it difficult to press the cathode sealing as shown in Figure 1. It becomes difficult.

Considering each of the above characteristics, the range that satisfies them is called maintaining the golden color, and when viewed from the back, Zn
2.7% and Al 3.8% or more. When looking at this from the perspective of maintaining workability, Zn3
If the Al content exceeds 6% or Al exceeds 6.5%, the workability deteriorates significantly, and the aluminum is excluded from the scope of the present invention, which is premised on press working.

On the other hand, when looking at the thickness ratio of each plate, it is naturally desired to maintain the characteristics as a cathode sealing plate, and also to achieve both the above-mentioned workability and high-quality directivity, and a plate thickness ratio suitable for this is desired.

From this point of view, the 808 layer needs to be thick enough for the sealing plate to sufficiently press the gasket and completely seal the active material of the battery, and for that purpose, the thickness of 5use should be at least 87 to 68%. It was confirmed through experiments that it is necessary to maintain the thickness configuration of . Therefore, the Cu layer and the Cu-Zn-Al alloy layer need to have a minimum thickness that can sufficiently withstand press working, and the minimum thickness is 8% for the C1 layer and 8% for the Cu-Zn-Al alloy layer. It was also found through press working experiments that there is a lower limit of 5%. On the other hand, C
Since the u-Zn-Al alloy layer itself is a material with high electrical resistance, it is not preferable to make it too thick, and the upper limit of the thickness is 12% to make the conductivity equivalent to that of a conventional Ni layer.
It has been confirmed through actual tests that CIJIH has an upper limit of 20% to satisfy the remainder.

The most suitable golden alloy is the above-mentioned Cu-Zn-Al alloy, but depending on preferences such as price, workability, color tone, etc., Cu-8L may be used.

Cu-3n, Cu-Zn, Cu-Be, Cu-Z
Alloys such as n-Ni type can also be used, and 5US304 or 5US430 is the most preferable SUS material to be used in the present invention, but depending on the application, it may be possible to replace it with a mild steel plate in order to reduce costs. be.

[Effects of the Invention] As described above, the cladding material according to the present invention has a three-layered structure, which makes the structure simpler, and can give the outer surface a golden color without any expensive gold plating. Therefore, it is difficult to visually distinguish it from gold-plated products, making it compatible with today's image of luxury products, and it also makes it possible to judge the polarity by the hue of the surface. When comparing the price, it is possible to reduce the price to 1/6 to 1/10 of that of gold-plated products, and in addition, it has better characteristics as a cathode sealing plate for button batteries than conventional products. The present invention has great significance as a cladding material that can exhibit the three-in-one effect without any inconvenience.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the configuration of a button battery, and Figure 2 is a cross-sectional view showing the configuration of a button battery.
Figure 3 is an enlarged cross-sectional view of the circled part of the figure when using the clad material according to the present invention, Figure 3 is an enlarged cross-sectional view of the circled part of Figure 1 when the conventional material is used, and Figure 4 is Cu.
It is an explanatory diagram showing the state of the Cu side of the -Zn-Al ternary system. DESCRIPTION OF SYMBOLS 1... Cathode sealing plate, 5... Gold plating layer, 7... Stainless steel layer, 8... Copper layer, 9... Golden alloy layer. Agent: Fujio Sato, patent attorney, TL: LF? Hiding; 0 shares 5; Rei no/ki bottle 3 prisoners 41D, u7t

Claims (1)

[Claims] (1) A copper layer on one side of a strip made of stainless steel and a C layer on the other side.
The u-Zn-Al alloy layer is clad in three layers, and the Cu-Zn
-The composition of the Al alloy layer is Zn2.7-36%, Al3.8
~6.5%, the remainder being substantially Cu, and the thickness ratio of the three-layer cladding layer is within the copper layer 8~6.5%.
20%, stainless steel 87-68%, Cu-Zn-Al
A cladding material for a button battery configured to have an alloy figure of 5 to 12%.