JPS634546A - Dry battery - Google Patents

Abstract

PURPOSE:To increase discharge capacity by forming an ultraviolet curing resin layer obtained by spreading insulating ultraviolet curing resin solution and curing by irradiating ultraviolet rays on the surface of a battery case on which a printing layer is directly formed and into which power generating elements are accommodated and sealed. CONSTITUTION:A printing layer is formed by directly printing design, characters, or figures on the outer surface of a battery case made of metal, into which power generating elements are accommodated and sealed, except for positive and negative terminal surfaces by a usual curved surface printing method. The positive terminal surface 4 and the negative terminal surface 5 are covered with masking materials 6, 7, and the outer surface of the printing layer 2 on the battery case is uniformly coated with ultraviolet curing resin solution. Ultra violet rays are irradiated to cure the coated resin and an ultraviolet resin layer 3 is formed in the outside of the printing layer 2. Thereby, the outer diameter of the battery case is increased and the number of parts used for the outer jacket of the battery is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a dry battery in which a power generating element is hermetically housed within a battery case formed by combining a battery can and a terminal plate.

<Prior art> For example, in a cylindrical battery such as a cylindrical alkaline battery, a battery case is made of a cylindrical battery can with a bottom and a disc-shaped terminal plate positioned at the opening of the battery can, and a positive electrode and a negative electrode are connected to each other. A configuration is used in which a power generating element, which is formed by opposing the two with a separator interposed therebetween, is hermetically housed in this battery case.

When packaging the battery case of this type of cylindrical battery, conventionally, as shown in FIG. 2 (8), for example, as shown in FIG. Exterior can 1 made of a thin metal sheet, insulating a shrinkable tube without binding it, and further providing a printed layer on the surface.
A configuration in which a completed battery is made by attaching the battery 0 with insulating washers 9 interposed above and below is widely used.

In addition, as shown in FIG. 2(B), a printed paper label 11 with a thickness of 0.2 mm fZ degree is wrapped around the outer periphery of the battery case.
There is also known a type in which a transparent or semi-transparent heat-shrinkable duvet 12 with a thickness of about 0.1 mm is placed over it and bound. In addition, recently, instead of using paper labels, labels with a thickness of 0.1 are made by laminating printed layers, heat-shrinkable tubes, etc.
Some devices are also used in which a small amount of exterior label is wrapped directly around the outer periphery of the battery case.

<Problems to be Solved by the Invention> However, in the case of using the above-mentioned outer can, not only the number of parts used for the battery outer case is large and the cost is high.
The diameter of the battery case must be made more than one size smaller than that of a completed battery with standard dimensions, and the capacity of the battery case to house the power generating elements is reduced, resulting in a problem that the discharge capacity of the battery is limited.

In addition, in the case of a paper label covered with a heat-shrinkable dupe or an exterior label, the structure is such that a film material, which has considerably inferior mechanical strength compared to a thin metal plate, is placed around the battery periphery, so it is difficult to handle it. There is a problem in that the surface of the battery case exposed from the scratches comes into contact with the terminal surface and is likely to cause an external short circuit. Furthermore, in order to obtain the necessary mechanical strength, a thicker film material must be used, which reduces the diameter of the battery case, resulting in the same problem as above that the battery discharge capacity is small.

<Means for Solving the Problems> The dry battery of the present invention is made by applying an insulating ultraviolet curing resin solution to the surface of the battery case, which seals the power generation element and has a printed layer directly on the surface, and then irradiating it with ultraviolet rays. The gist is that an ultraviolet curable resin layer is provided by solidifying the resin.

Examples of the above-mentioned ultraviolet curable resin solution include 2-
Hydroxy-3-phenoxypropylacrylate (trade name: "Aronix M-8060J" manufactured by Toagosei Chemical Co., Ltd., liquid) to which an appropriate photoinitiator is added is used.

This ultraviolet curable resin solution becomes an ultraviolet curable resin having a pencil hardness of 4H1 and an elongation rate of about 10% after being solidified by ultraviolet irradiation. It is known that when such a layer of ultraviolet curing resin is used for the exterior of a battery case, a layer thickness of about 0.05 mm is necessary and sufficient.

Effects> By using the above means, it is possible to use a battery case that has approximately the same diameter as a completed battery of standard dimensions, and the capacity of the power generating element accommodated within the battery case is considerably increased. Furthermore, since the ultraviolet curable resin has a high hardness, it can be practically prevented from being scratched during handling.

<Example> An example in which the present invention is applied to a cylindrical battery will be described below.

A printed layer was provided by directly printing designs, letters, numbers, etc. on the outer surface of the metal battery case in which the power generation element was hermetically housed, excluding the positive and negative terminal surfaces, using a known curved surface printing method. Next, as shown in FIG.
and the negative electrode terminal surface 5 were covered with masking members 6 and 7, and an ultraviolet ray curing resin solution was applied uniformly (0.05 mm thick) to the outer surface of the printed layer 2 on the surface of the battery case 1.

The ultraviolet curing resin solution was prepared by adding 5 parts by weight of BEE (benzoin ethyl ether) as a photoinitiator to 100 parts by weight of Aronix M-8060 (2-hydroxy-3-phenoxypropylacrylate) manufactured by Toagosei Chemical Co., Ltd. was used.

After coating, the solution was cured by irradiation with ultraviolet rays to form an ultraviolet curable resin layer 3 having a thickness of o and osmm on the outside of the printed layer 2. When the hardness of this ultraviolet curable resin layer 3 was examined, it was found to be approximately 41-1 in terms of pencil hardness.

<Effects of the Invention> According to the dry battery of the present invention configured as described above, the outer diameter of the battery case can be increased, the capacity of the power generating elements inside the battery increases, and the battery discharge performance is significantly improved. It is possible to reduce the number of parts used for the battery exterior by /i
), it has the effect of reducing the cost to a greater extent.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention. The explanatory diagrams of A-built culm, Figures 2 (A) and (B), are explanatory diagrams of conventional examples, respectively. DESCRIPTION OF SYMBOLS 1... Battery case, 2... Printing layer, 3... Ultraviolet curing resin layer.

Claims (1)

[Scope of Claims] 1. Ultraviolet curing, which is made by applying an insulating ultraviolet curing resin solution to the surface of a battery case that seals and houses a power generation element and having a printed layer directly provided on the surface, and solidifying it by irradiating it with ultraviolet light. A dry battery characterized by having a resin layer. 2. An ultraviolet curable resin layer is provided by applying an ultraviolet curable resin solution to the entire surface of the battery case, which has masked the battery terminal surface serving as the electrode, and solidifying it by irradiating it with ultraviolet rays. The dry battery described in item 1.