JPS614157A - Alkaline battery - Google Patents

Abstract

PURPOSE:To maintain performance and reduce cost when a negative electrode terminal plate housing a negative electrode whose principal component is hardened zinc by cladding the battery inner surface side of a stainless steel matrix with copper and nickel-plating the outer surface side. CONSTITUTION:A negative electrode terminal plate 9 housing a negative electrode 8 in which granulated hardened zinc is diffused in a gel form by means of alkaline electrolytic solution and a gelatinizing agent is formed by cladding the battery inner surface side of a stainless steel matrix 5 with copper 6 by using the hot rolled method, etc. and nickel-plating 7 the outer surface side by using the electroplating method, etc. Then, a button type alkaline battery is formed by combining positive electrode black mix 2 housed in a positive electrode can 1 that is nickel-plated on stainless steel, separator 3, gasket 4, etc. As a result, the incovenience resulting from pinholes can be eliminated like copper plating and the cost of an alkaline battery can be reduced by using the battery inner surface side only as the cladding section.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an alkaline battery, and more particularly to a negative terminal plate in an alkaline battery in which a negative electrode is housed in contact with the negative terminal plate, such as a button-type alkaline battery. This relates to the improvement of materials.

<Prior art> An alkaline battery is composed of an oxide such as manganese dioxide or silver oxide for the positive electrode, gelled zinc chloride for the negative electrode, and an alkaline electrolyte such as a caustic soda solution as the electrolyte. Due to its excellent discharge performance, it is in high demand, especially in the field of small batteries. By the way, for example, in a button-type alkaline battery, the negative terminal plate is made of a stainless steel base material that is clad with copper on the inner surface of the battery and nickel on the outer surface of the battery (hereinafter referred to as "three-layer clad material").
Layered cladding materials with copper plating instead of copper cladding (hereinafter referred to as "copper-plated materials"), or materials in which copper is simply clad on the inner surface of the battery of a stainless steel base material (hereinafter referred to as 12-layer cladding materials). ) etc. have been conventionally used. In this way, by providing a copper layer on the inner surface of the battery of the negative terminal plate that is in direct contact with the negative electrode whose main component is zinc chloride, the inner surface of the battery that comes into contact with the zinc chloride is amalgamated and galvanized. This prevents the generation of hydrogen gas due to contact between the negative terminal plate and the negative electrode electrolyte. However, the conventional negative terminal plate described above has the following drawbacks. In other words, the three-layer clad material is
Since both sides of the stainless steel base metal must be clad with copper and nickel, manufacturing costs rise.

On the other hand, copper-plated materials or two-layer clad materials are advantageous over three-layer clad materials in that manufacturing costs can be reduced. However, if the copper plating material is insufficiently copper plated and a so-called pinhole is formed, the stainless steel fI14 base material, which has a low hydrogen overvoltage, is exposed at the pinhole part, and comes into contact with the alkaline electrolyte of the negative electrode and hydrogen Since gas is generated, the internal pressure of the battery increases after assembly, which tends to cause leakage or battery rupture. In addition, when batteries with double-layer cladding are loaded into a device, the terminals on the device side come into contact with the stainless steel base material, which has a high contact resistance, resulting in a decrease in the battery's discharge performance during use. It's inconvenient.

−〈Problems to be solved by the invention〉 The present invention solves the above-mentioned disadvantages caused by the inappropriate material of the negative terminal plate in conventional alkaline batteries, and provides a negative terminal plate made of the optimal material. The purpose is to provide alkaline batteries with

<Means for Solving the Problems> The alkaline battery of the present invention is an alkaline battery in which a negative electrode containing zinc dihydride as a main component is housed in direct contact with the negative terminal plate. The gist is to use a negative terminal plate made of copper cladding and nickel plated on the outer surface of the battery made of stainless steel lff1 material.

<Example> Figure 1 shows an example in which the present invention is applied to a button-type alkaline battery, in which 1 is a cylindrical cup-shaped positive electrode can made of stainless steel plated with nickel, 2 is a carbon dioxide A positive electrode mixture made by adding a conductive agent and a binder to manganese, silver oxide, etc. and press-molding the mixture after wiring, 3 is a separator made of polypropylene nonwoven fabric, etc., and 4 is a ring-shaped material made of synthetic resin such as polypropylene or polyethylene. gasket,
Reference numeral 8 denotes a negative electrode in which granular or powdered zinc chloride is dispersed in a gel form using an alkaline electrolyte and a gelling agent.

In Figures 1 and 2, 5 is a stainless steel base material, 6 is copper clad on the inner surface of the stainless steel base material 5 by hot rolling, etc., and 7 is clad with electroplating on the outer surface of the battery. It is nickel plated by.

Then, a plate made of such a material is formed into a negative electrode terminal plate 9 by drawing or the like in a conventional manner.

<Effects of the Invention> As described above, the alkaline battery of the present invention uses a stainless steel base material with copper cladding on the inner surface of the battery and nickel plating on the outer surface of the battery as the negative terminal plate. Since the cladding, which is expensive to manufacture, is only on one side, and not all of the cladding is made of cladding material like the conventional three-layer cladding material, the manufacturing cost can be reduced accordingly. In addition, since the structure has copper cladding on the inner surface of the battery with a stainless steel base material,
Unlike conventional copper plating materials, there are no problems caused by pinholes. Even if the cladding part is limited to the inner surface of the battery with a stainless steel base material and the outer surface of the battery is only plated with nickel, the contact resistance of the outer surface of the battery can be made sufficiently low by just nickel plating. Therefore, unlike conventional two-layer clad materials, the discharge performance does not deteriorate during use.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention, and FIG. 2 is an enlarged view of portion A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Positive electrode can, 2... Positive electrode mixture, 5... Stainless steel base material, 6... Copper, 7... Nickel plating, 8...
...Negative electrode, 9...Negative electrode terminal plate.

Claims (1)

[Claims] 1. In an alkaline battery containing a negative electrode containing zinc chloride as a main component in direct contact with the negative terminal plate, the inner surface of the stainless steel base material is clad with copper, and the outer surface of the stainless steel base material is clad with copper. An alkaline battery characterized in that the negative terminal plate is nickel plated.