JPS58137956A - Dry cell - Google Patents

Abstract

PURPOSE:To prevent any bad influence upon the performance of a dry cell, which might be caused by heat during manufacturing of the dry cell, by coating both the outer circumference surface of a zinc can and the periphery of a sealing body, which is provided at the upper end of said zinc can, with a synthetic-resin coat layer which is hardened by thermal rays. CONSTITUTION:A three-dimentionally-cross-linked hardening resin liquid such as an unsaturated polyester resin liquid or an unsaturated epoxy resin liquid is mixed with an appropriate amount of a photopolymerization-initiating agent which produces radicals, such as an ultraviolet-ray-polymerization initiating agent or an electron-ray-polymerization initiating agent. A coat layer 6 is formed by applying such a mixture to an area extending from the outer periphery of a sealing body 5 to the outer circumference surface and the bottom surface of a zinc can 1, and hardening thus applied mixture by irradiating thermal rays such as ultraviolet rays or electron rays. Thus, since the above resin liquid absorbs the thermal rays to accelerate its own polymerization, and hardens in a few seconds according to the exposure, the coat layer 6 is formed into a strong film. As a result, since the above resin liquid is hardened at ordinary temperature as mentioned above, there is no thermal influence on the dry cell during its manufacturing. In addition, since the above resin liquid is hardened in an extremely short time, doesn't contain any solvent and is of a mono-liquid type, the manufacturing process can be shortened, and a mass production method can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the outer packaging structure of a cylindrical dry battery.

For conventional cylindrical dry batteries >Vh, there is an electrical connection between the IIi lead can that serves as the container and the metal jacket for the exterior.
In order to prevent electrolyte leakage, the outer periphery of the zinc can is covered with an insulating film layer.

As a conventional means for forming the insulating coating layer, zinc cans are used.
- immersed in sm wax to form a wax coating layer and coated with a thermoplastic resin such as vinyl, acrylic, or thermosetting resin such as alkyd resin, phenol resin, or epoxy resin, Some are dried (or hardened) to form a coating layer.

However, when the former (wax) is used, heat is applied to the unit cells inside the lead can during immersion, causing the cells to roll up and have a negative effect on the active material, electrolyte, and especially the sealing body made of synthetic resin. 9, which melts and flows out, and cracks occur due to temperature cycles such as temperature differences between day and night, which shortens the life of the battery.

On the other hand, although the latter synthetic resin coating layer does not cause any problems during storage, it is also dried by heating, and the lubricious or hot-melt type is coated with heat to form a coating on the outer periphery of the zinc can. As mentioned above, this adversely affects the battery during its manufacture. Among the latter, especially those using thermosetting resin tubes, 4 had a long curing time, and 9 had a long pot life. It has many drawbacks, such as rounding problems and restrictions on production quantities and handling.

The present invention has been made in view of the above points, and its purpose is to enjoy the advantages of the above-mentioned resinous MS layer while reducing its disadvantages in terms of battery performance during manufacture. The negative effects of this and other manufacturing problems are to be resolved in order to provide nine-dry batteries.

That is, the dry battery of the present invention has #! The outer circumferential surface of the lead can and the periphery of the sealing body at the upper end of the zinc can are coated with a synthetic resin coating layer formed by paper-hardening with a cold wire. It is assumed that t-% mold is in close contact with the ship can and the sealing body in a liquid-tight manner.

Next, the present invention will be described according to the accompanying drawings.

The figure shows an example of the configuration of a cylindrical dry cell according to the present invention, in which an anode mixture 8 and a carbon rod 4 are inserted into the inside of an opened zinc can l with a separator 2 interposed therebetween. A synthetic resin tear sealing body 6 made of polyethylene or the like is attached to the upper opening of the zinc can l, and a synthetic resin 1!1a11g is formed from the outer peripheral edge of the sealing body 5 to the outer circumferential surface and bottom surface of the zinc can l. I'm here.

This coating I96 is an unsaturated polyester resin liquid.

A suitable amount of a photopolymerization initiator such as an ultraviolet polymerization initiator or an electron beam polymerization initiator that generates radicals is mixed with a three-dimensional curable resin liquid such as an epoxy resin liquid, and this is mixed into the sealing body 50.
After applying the coating from the outer edge to the outer circumferential surface and bottom of the zinc can, apply cold and hot mF! It is cured by R radiation, and the resin liquid absorbs the cold and hot rays, promoting polymerization, and depending on the irradiation dose, it hardens within a few seconds, forming a tough film. It is a gift.

After forming the coating NI6 in this way, an exterior metal jacket is fitted, and its upper end is fastened to the outer periphery of the metal sealing cap 8 placed on the top surface of the sealing body 6. The lower part 4 was fastened to the outer peripheral edge of the 11 m terminal plate IO disposed on the lower surface of the zinc can 1 through a 9-metal metal ring.

In the figure, reference numeral 11 is an iL nine-sided terminal fitted onto the upper end of the carbon rod 4, reference numeral 12 is brim paper, and reference numeral 13 is a sealant such as pitch filled on the upper surface thereof.

In the nine-dry battery constructed as described above, the resin-coated rill that successively covers the outer periphery of the zinc can 1 from the outer periphery of the sealing body 5 is different from that of conventional wax type batteries. The material is extremely strong and has a three-dimensional network structure, and does not deteriorate at all during storage.Furthermore, compared to conventional synthetic resin coating layers, it hardens at room temperature, so it is less susceptible to thermal effects on batteries during manufacturing. There is no battery at all, and the initial battery and 43i!
In addition to further improving storage performance, it cures in an extremely short period of time, is solvent-free, and is liquid-based, making it possible to shorten the process, make mass production possible, and improve the working environment. It also has various advantages such as ease of handling.

Next, specific embodiments of the present invention will be explained.

Note that the present invention is not limited to the following examples.

Actual example 1゜100 parts of unsaturated polyester resin liquid (weight, same below)
A resin solution to which 8 parts of benzophenone was added as a photopolymerization initiator was applied to all surfaces of 1 liter of clam can and the sealing body 6, and then a mercury lamp (1
The above resin liquid was cured by exposing it to ultraviolet light (100 #400 μ) for 8 to 6 seconds to form a coating layer 6.Then, the dry battery shown in the same figure was assembled in a round shape, and this layer was then assembled into a dry battery as shown in the figure. The initial performance and storage performance of this product were better than that of a conventional round product using a coating layer with an i-shift. This means that the resin is cured at room temperature, so there is no adverse effect on the inside of the battery due to heating, and the inner part of the battery is well protected by a strong three-dimensional network structure that cures even further. This suggests that

Example 18.5 parts of Lewis acid Fj of an aromatic diazonium cation as a photopolymerization initiator was added to 100 parts of Kame epoxy resin, and the resin liquid was applied to the surfaces of the lead-resistant can 1 and the sealing body 6 according to the operating procedure of the example. After coating, the same ultraviolet rays as above were applied to form a coating 16f: a circle.

Similarly to the above-mentioned example, the battery obtained in this way also had a significant improvement in initial performance and storage performance compared to batteries provided with a conventional coating layer.

[Brief explanation of the drawing]

The figure is a longitudinal cross-sectional view showing an example of an internal cylindrical dry battery to which the present invention is applied. l...Zinc can 5...Sealing body 6---Synthetic resin coating layer 7...Metal jacket patent Applicant Fuji Electrochemical Co., Ltd. Agent
Patent attorney - Ken Iro

Claims (1)

[Claims] (1) Synthetic resin 4Ii cured by cold heat 1) on the outer peripheral surface of the zinc can and the outer peripheral edge of the sealing body at the upper end of the tse field.
A dry battery characterized in that it is coated with a covering layer and is in close contact with the zinc can and the sealing body in a liquid-tight manner.