JPH0574426A - Label jacket type battery - Google Patents

Abstract

PURPOSE:To improve adhesion of an overlapped margin part of a label jacket of a label jacket type battery. CONSTITUTION:An overlapped margin part (d) is determined in a label jacket 2, in which an end 3a for winding start and an end 3b for winding finish are overlapped with one another, while the jacket is wound around the outer periphery of a unit cell 1 by rolling pressure. Notched parts 4a, 4b that form uneven parts along the longitudinal direction are continuously formed repeatedly on the end 3a for winding start.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the adhesiveness of the overlapping portion of a label jacket of a label-clad battery.

[0002]

2. Description of the Related Art A label jacket for a battery of a label exterior type is a tubular jacket in which a label is printed on the surface of a heat-shrinkable film such as an aluminum vapor-deposited PVC film and an acrylic adhesive is arranged on the back surface. The outer circumference of the unit cell is surrounded by a label jacket, and the outer periphery is completed by heating and bringing them into close contact.

The label-clad battery has an advantage that the outer capacity can be increased with a battery having the same diameter and the manufacturing can be simplified because the outer casing can be made thinner than the metal-clad battery. It is used for cylindrical batteries other than manganese dry batteries whose outer circumference is consumed.

[0004]

In this label-equipped battery, the shape of the label jacket is formed into a rectangular shape which is the developed shape of the outer periphery of the unit cell, and the label jacket is wound around the outer periphery of the unit cell by rolling and the start of winding. And, a method of overlapping the winding end ends is adopted, and the adhesion is strong at the general part because of the metal-acrylic adhesion, but the adhesion at the overlap part is weak because of the PVC-acrylic adhesion.

For this reason, there is a drawback in that, when the battery is loaded in a battery box or the like, if the overlap margin comes into contact with the protrusion, this portion is easily turned over and peeled off.

If the overlap margin is not provided, the winding start end and the winding end end are separated due to heat contraction, and the metal base material constituting the unit cell can be seen. Therefore, the overlap margin dimension in consideration of the heat contraction is secured. Had to do.

The present invention solves the above problems.
The purpose is to increase the contact area between the label jacket and the metal surface of the unit cell in the overlap area as much as possible while ensuring the overlap size of the label jacket, thereby improving the adhesion of the overlap area. is there.

[0008]

In order to achieve the above-mentioned object, the present invention provides a label outer packaging in which the outer periphery of a unit cell is surrounded by a heat-shrinkable label jacket, and the label jacket is heated to adhere to the unit cell. In the battery of the formula type, a notch portion is provided along one end edge portion of one end of the overlapping margin formed by both end portions of the label jacket in the outer peripheral direction of the label cell, which is fixed to the unit cell in advance. It is characterized by being

[0009]

In the label-covered battery having the above structure, the film-adhesive is adhered to the label jacket in a state where the unit cell is surrounded and closely adhered to the label jacket, where the cutouts of both ends of the label jacket are not formed. Therefore, the metal-adhesive is bonded at the portion where the notch is formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a label-clad tubular battery according to the present invention, in which 1 is a cylindrical unit cell, and 2 is a label jacket surrounding the outer periphery of the unit cell 1.

As shown in a partially enlarged view of FIG. 1, the label jacket 2 has a label 2b printed on the surface of a heat-shrinkable film 2a such as an aluminum vapor-deposited PVC film and an acrylic adhesive 2c on the back surface. Are arranged, and the shape is formed in a rectangular shape which is a developed shape of the outer periphery of the unit cell 1.

Then, as shown in FIG. 2, the winding start edge 3 is wound around the outer periphery of the unit cell 1 by rolling.
The overlap margin d is set so that a and the winding end edge 3b are overlapped.

Further, the winding start edge 3a which is fixed to the unit cell in advance is provided with notches 4a and 4b which are uneven along the longitudinal direction thereof and which are continuously and repeatedly formed. Therefore, as shown in FIG. 3, the concave and convex notches 4a,
The portion of the winding end edge 3b that overlaps with 4b faces the convex portion 4a, and the film 2a and the adhesive 2c are bonded to each other, and the adhesive strength at this portion is about the same as the conventional one.
At the portion facing the recess 4b, the metal surface of the unit cell 1 is bonded to the adhesive 2c, and the adhesive strength is extremely high. Therefore, the total area of the recess 4b, that is, the bonding area between the metal surface of the unit cell 1 and the adhesive 2c. Accordingly, it is much higher than the conventional adhesive strength of the overlapping portion.

After the compaction work or in parallel with this compaction work, hot air is blown to the outer periphery of the label jacket 2, and the cylindrically rounded ends 5 are folded into the shoulders 1a at both ends of the unit cell 1. As a result, the exterior of the battery is completed as shown in FIG.

As shown in FIG. 5A, the recess 4a
The shape of -1 may be an arc shape, and the shape can be appropriately selected. Further, as shown in FIG. 2B, the winding end edge 3b may be formed with notches 4a-2 and 4b-2 having irregularities at a different pitch. In this case, the adhesive 2
The adhesion area of c to the metal surface increases. Further, as shown in FIG. 7C, the length of the concave portion 4a-3 is set to the convex portion 4b-
If the length is longer than 3, the adhesive area of the adhesive 2c to the metal surface can be increased.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the cylindrical unit cell has been described. However, the unit cell having another shape such as a cylindrical unit cell having another rectangular cross section. It can also be applied to batteries as appropriate.

[0017]

As described above in detail with reference to the respective embodiments, in the label-clad battery according to the present invention, the label jacket has the notches formed at the both ends of the label jacket which are overlapped with each other. The part that does not have a film
Although the adhesive is bonded to each other, since the metal surface-adhesive is bonded at the portion where the notch is formed, the contact area between the overlap and the unit cell is ensured while ensuring the overlap size of the label jacket. It can be made as large as possible, and the adhesiveness at the overlapping portion, which was a weak point of this type of label exterior method, can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a label-clad battery according to the present invention before assembly.

FIG. 2 is a perspective view showing a state in which a label jacket is wound around the battery.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view showing a completed state of the battery.

FIG. 5 is a partial plan view showing a modified example of a notch shape in which (a), (b) and (c) are uneven.

[Explanation of symbols]

 1 unit cell 2 label jacket 3a winding start edge 3b winding end edge 4a, 4a-1, 4a-2, 4a-3 concave portion 4b, 4b-2, 4b-3 convex portion d overlap size

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinfumi Suzuki 5-11-3 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd.

Claims (1)

[Claims] 1. A label external battery in which the outer periphery of a unit cell is surrounded by a heat-shrinkable label jacket and the label jacket is heated to make close contact with the unit cell. A label-enclosed battery, wherein a stacking portion formed by a portion is provided with a notch along one of the edge portions that are fixed to the unit cell in advance.