JPH03286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of mounting a plastic film jacket on a battery.

[Conventional technology]

As shown in FIG. 5, a conventional alkaline dry battery 20 has a structure in which a metal jacket A made of a plate-shaped metal plate is included on the outer peripheral surface of a battery body 30.

In recent years, the types of alkaline dry batteries have not only become more diverse, but also the battery performance has been significantly improved. For example, one example is one that has a larger battery capacity than conventional products while maintaining the same battery size. This alkaline dry battery uses a jacket made of heat-shrinkable synthetic resin film link film (hereinafter referred to as ``film''), which has the advantage of being thinner and easier to package than conventional metal jackets. The idea was to take advantage of this fact to improve the capacity of the battery. Furthermore, by using a shrink film jacket for an alkaline battery, it is possible to reduce costs and weight compared to a metal jacket.

The battery has film 1 as shown in FIG.
is wrapped around the battery body 30 and adhered to the surface of the battery body 30 using the adhesive layer 2 on the back side of the film 1, and the overlapping margin 50 at both edges of the film 1 is adhered, and then heat shrinkage treatment such as hot air is applied. The film 1 is manufactured by heat-shrinking the film 1 as shown in FIG. 4, and using the heat-shrinking force to bring it into close contact with the surface of the battery body. Here, the film 1 is longer than the battery main body 30, and in the heat shrinking process, the film 1 has an upper edge la and a lower edge lb.
The projecting parts 5 and 6 are formed by bending and contracting the battery body 30 inward to wrap around the edges of the shoulder part 33 and the bottom part 34 of the battery main body 30.

In this way, the film 1 is attached to the battery body 30.
are tightly integrated by the heat shrinkage force and the adhesive force of the adhesive applied to the bottom surface of the film.

Further, as shown in FIG. 6, the battery main body 30 is made by drawing the peripheral edge of the plate forming the negative electrode 32, bending the lower edge of the cylinder forming the positive electrode 31 inward, and making both electrical insulators. 60, the annular recess 3 is formed on the periphery of the bottom 34.
Generally, there are 5.

On the other hand, since the protruding parts 5 and 6 of the film 1 simply protrude at a right angle to the side part 36 of the battery main body 30, they cannot be bonded to a surface at an angle inside the perpendicular angle.

[Problem that the invention seeks to solve]

However, in the case of such an alkaline dry battery 20, the surface of the recess can be reliably covered simply by covering the annular recess 35 of the battery body 30 with the projecting portion 6 of the film 1 as shown in FIG. It will not become adhesive.

Therefore, when a battery is loaded or removed from an electric appliance that uses dry batteries as a power source, the contact fitting (spring seat-like metal fitting) of the appliance gets into the gap between the protruding part 6 and the annular recess 35, and the protruding part 6 There is a problem in that the film 1 may be torn from that part by applying it. Further, the annular recess 35 is
Since the negative pole and the positive pole are close to each other and face each other, if a contact metal fitting enters this annular recess 35, the contact metal fitting will come into contact with both poles and cause a short circuit.
There is a problem.

The present invention is an improved method for attaching a plastic film jacket to a dry battery to solve the above problems.

[Means and actions for solving problems]

The method of attaching a plastic film jacket to a battery body according to the present invention involves wrapping a shrink film having an adhesive layer on the inner surface of at least the edge portion around the body of the battery body, and applying heat shrink treatment to the film to form a plastic film jacket into the battery body. The film is brought into close contact with the circumferential surface of the battery body, and the end edge of the film is bent inward to form an inwardly bent protrusion extending into the annular recess on the end face of the battery body;
Next, a protrusion of a holding jig having an annular protrusion that fits into an annular recess on the end face of the battery body is applied to the protruding part of the film, and the protruding part of the film is bent inward of the annular recess. It is characterized in that it is bonded to the surface of the annular recess.

The Shrink film is tightly and firmly integrated onto the surface of the dry battery body, except for the positive electrode at the top of the battery body and the negative electrode at the bottom, by the heat shrinkage force and the adhesive force of the adhesive. Therefore, there is no part where the contact fittings etc. can get caught, and since the protruding part is glued to the annular recessed surface, short circuits will not occur even if the contact fittings etc. fit into the annular recessed surface. do not have.

The protruding portion adhered to the annular recess is attached at least to the vicinity of the bottom of the valley.

〔Example〕

An embodiment of the method of the present invention will be described below with reference to the drawings.

This embodiment is the same as the conventional method shown in FIGS. 3 and 4 up to the point where the film 1 is included in the battery body 30, so the explanation thereof will be omitted.

As shown in FIG. 1, a holding jig 70 having an annular protrusion 71 that can be fitted into the annular recess 35 is attached to the protrusion 6 of the film 1 extending into the annular recess 35 on the lower surface of the battery main body 30. By pressing the battery body 30 against the holding jig 70 or, conversely, pressing the holding jig 70 against the battery main body 30, the protruding portion 71 bends the protruding portion 6 inward and presses the protrusion 71 against the positive electrode side of the annular recess 35. Glue it to. at this point
As shown in FIG. 2, a jacket A' is formed in which the film 1 is tightly enclosed around the battery body 30. Furthermore, since the surface of the film 1 is printed with colors, patterns, instructions for use, trademarks, etc., the jacket A' also serves as a label. Here, the holding jig 70 presses the projecting portion 6 into the annular recess 35.
It is made of an elastic material such as rubber that can be pressed against the surface under surface pressure. Although the protruding portion 6 can be bonded to the annular recess 35 even when the presser jig 70 is at room temperature, it is better to heat the presser jig 70 to 40 to 150° C. so that the protruding portion 6 can be bent. In addition, since the adhesion effect is great, the presser jig 70 is usually heated before use. Therefore, as the holding jig 70, silicone rubber or the like having excellent heat resistance is suitable.

Note that the method for wrapping the film 1 around the battery body 30 may be such that the cylindrical film 1 is fitted onto the battery body 30 and then the cylindrical film 1 is subjected to a heat shrinking treatment to obtain the wrapped state. , also film 1
The inner adhesive layer 2 may be applied only to the edge portions of the film 1.

Further, in the above embodiment, a case has been described in which the protruding portion 6 is adhered to the annular recess 35 on the negative electrode side of the alkaline dry battery, but the present invention is not limited to this, and can also be applied to the positive electrode side.

Furthermore, the present invention can be applied to manganese dry batteries and the like.

〔Effect of the invention〕

According to the present invention, it is possible to finish the Shrink film in an inclusive manner in which it is completely adhered to the surface of the dry battery except for the pole parts, and furthermore, the protruding part can be adhered to the annular recess of the dry cell without any gap. A jacket body with excellent protective function and good appearance and appearance can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing the method of the present invention step by step, Figures 3 and 4 are explanatory diagrams showing the conventional method step by step, and Figure 5 is a side view showing a conventional dry battery. FIG. 6 is a partially cutaway sectional view of the battery main body. 1: Shrink Film, 6: Dispatch Department, 30:
Battery body, 35: Annular recess, 70: Holding jig, 7
1: Annular protrusion, A': Plastic film jacket.

Claims (1)

[Claims] 1 Wrap a shrink film having an adhesive layer on the inner surface of at least the edge part around the body of the battery body,
The film is brought into close contact with the circumferential surface of the body of the battery main body by heat shrinking treatment, and the end edge of the film is bent inward to form an inwardly bent protrusion extending into the annular recess on the end face of the battery main body. Applying a protrusion of a holding jig having an annular protrusion that fits into an annular recess on the end face of the battery body to the protruding part of the film,
A method for attaching a plastic film jacket to a battery, comprising bending the protruding portion of the film inward of the annular recess and adhering it to the surface of the annular recess.