JPH0449821Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> This invention involves welding the positive terminal plate integrally to the bottom of the positive electrode can, and wrapping the outer periphery of the positive electrode can with a heat-shrinkable label to complete the exterior. The present invention relates to an improvement of a label jacket type cylindrical battery that allows

<Prior Art> As is well known, in label jacket type cylindrical batteries, a heat-shrinkable label is wrapped around the outer periphery of the positive electrode can, which also serves as a case for the active material, to complete insulation and packaging. Therefore, compared to a conventional metal case type battery, when the battery is of the same standard, the content of the active material is increased and the battery performance is improved.

By the way, large batteries like the LR20 are heavy and the terminals are easily deformed if dropped, so they are reinforced by welding a separate positive terminal plate to the bottom of the positive electrode can. ing.

Therefore, for large-sized batteries such as LR20 (AA batteries), the bottom of the positive electrode can is not an integrated terminal, but a separate positive terminal plate is bonded to the bottom of the positive electrode can. There is.

In this case, with a metal can type, the metal can can be caulked to the positive terminal plate, so there is no need to weld it separately, but with a label jacket type, this is not possible. . Therefore, as shown in FIG. 3, a positive terminal plate 2 is integrated with the bottom surface of the positive electrode can 1 by welding to reinforce this portion.

<<Problem to be solved by the invention>> However, according to this structure, the shoulder part of the continuous part from the bottom to the side of the positive electrode can 1 is rounded, whereas the outermost peripheral part of the terminal plate 2 is rounded. Since it is flat, the shoulder part is at an acute angle, and a gap is created between the two, so the edge of the heat-shrinkable label 3 that covers the outer periphery of the positive electrode can 1 is heated to the peripheral edge of the terminal plate 2. It was bent due to shrinkage and hit this sharp shoulder, causing it to break.

In addition, when thermally shrinking, it tends to dent along the gap d formed between the positive electrode can and the terminal plate, which also causes deterioration in appearance.

The purpose of this invention is to solve the above-mentioned problems and to provide a label jacket type cylindrical battery that prevents tearing and deterioration of appearance due to dents in the shoulder portion of the heat-shrinkable label.

<Means for Solving the Problems> In order to achieve the above object, this invention involves welding the positive terminal plate integrally to the bottom of a cylindrical positive electrode can that also serves as a case for the active material, and attaching it with a heat-shrinkable label. In the label jacket type cylindrical battery, the heat-shrinkable label covers the outer periphery of the positive electrode can, and the edge of the heat-shrinkable label is bent to cover the peripheral edge of the positive electrode terminal plate, Corresponding to the diameter of the bottom surface of the positive electrode can, the outermost periphery is curved along the rounded shape of the shoulder formed between the bottom surface and the side of the positive electrode can, and the outermost periphery The portion was formed to become gradually thinner toward the tip.

<<Operation>> According to the above configuration, the outermost peripheral portion of the positive electrode terminal plate is integrated by welding in a state that corresponds to the rounded shape of the shoulder portion of the positive electrode can.

Therefore, when the heat-shrinkable label is wrapped around the outer periphery of the positive electrode can, the shoulder part is rounded, so it will shrink according to the external shape and will not tear, and since there are no gaps, it will not cause dents or the like. Does not occur.

<<Example>> Hereinafter, an example of this invention will be described in detail using the drawings.

Figures 1 and 2 show the LR20 to which this idea was applied.
The main parts of the label jacket type cylindrical battery are shown.

In the figure, 10 is a positive electrode can that also serves as a case for the active material A, 12 is a positive terminal plate that is integrated with the bottom of the positive electrode can 10 by welding, and 14 covers the outer periphery of the positive electrode can 10. This is a heat-shrinkable label whose edge is bent and joined to the peripheral edge of the positive electrode terminal plate 12.

The positive electrode can 10 has a cylindrical shape with a bottom obtained by deep drawing a thin metal plate such as a nickel-plated steel plate using a press or the like. The shoulder portion 10c formed in the shoulder portion 10c is set to have a relatively rounded curvature R1.

Further, a ring-shaped protrusion 16 for reinforcing the bottom surface is formed by press molding on the peripheral edge of the bottom surface portion 10b.

Like the positive electrode can 10, the positive electrode terminal plate 12 is obtained by press-forming a thin plate such as a nickel-plated steel plate, and has a disk shape with a diameter approximately equal to the diameter of the bottom surface portion 10b. A ring-shaped protrusion 18 that overlaps with the ring-shaped protrusion 16 is provided in a protruding manner, and a connecting protrusion 20 that comes into contact with an external connection terminal is provided in a higher protrusion in the center. Further, the outermost peripheral portion 22 of the positive terminal plate 12 has a curvature R2 approximately equal to the curvature R1 of the shoulder portion 10c.
The outermost periphery is formed to be gradually thinner toward the tip.

The heat shrinkable label 14 is made of a heat shrinkable film 14a.
A label printing 14b is applied to the surface of the , a wear-resistant varnish layer 14e is applied to the surface, aluminum vapor deposition is applied to the back surface, and an adhesive layer 1 is applied to the back surface of this aluminum vapor deposition layer 14c.
4d.

After assembling the unit cell, such as filling with the positive electrode active material A, the positive electrode can 10 and the positive electrode terminal plate 12 are integrated by welding before the heat-shrinkable label 14 is covered.

This work is performed by resistance welding, etc., and the positive electrode can 10
The inner bottom surface and the positive terminal plate 12 side are held between respective welding electrodes, and a welding current is passed between the two to integrate them.

By setting the curvature R2 of the outermost peripheral part 22 of the positive electrode terminal plate 12 to be equal to or slightly larger than the curvature R1 of the shoulder part 10c of the positive electrode can 10, the outermost peripheral part is completely aligned with the shoulder part 10c when pressed. The parts 22 overlap each other and can be integrated without any difference in level.

In the battery, first, before welding the positive terminal plate 12, the positive electrode can 10 is filled with active material A, a separator, etc., and the opening on the opposite side from the bottom 10b is sealed with an insulating sealing gasket. After sealing with a negative terminal plate (all not shown), the positive terminal plate 12 is welded to the bottom 10b of the positive can, and then the heat-shrinkable label 14 is covered in the final step.

The covering work is to attach a heat shrink label 1 to the outer periphery of the positive electrode can 10.
4, the positive electrode can 10 is rolled and squeezed to complete the winding, and then hot air is blown to shrink the heat-shrinkable label 14, so that it is integrated with the outer periphery of the positive electrode can 10 in a tight state. During this contraction, the edges of the heat-shrinkable label 14 protruding from both ends of the positive electrode can 10 contract so as to be bent in the radial direction.

Then, on the positive electrode terminal plate 12 side, the protrusions 18 are bent toward the outer periphery using the dividing line for edging, and the positive electrode terminal plate 12 is joined together in a ring shape with tension generated in the radial and longitudinal directions.

At this time, the edge of the heat-shrinkable label 14 will be bent along the curvature of the shoulder, but since this portion is rounded, no tearing will occur.

Furthermore, the outermost circumferential portion 22 of the positive electrode terminal plate 12 and the shoulder portion 10c of the positive electrode can 10 almost coincide with each other, and there is no gap d as in the conventional case. It becomes something.

<<Effects of the Invention>> As explained in detail using the embodiments above, the label jacket type cylindrical battery according to this invention has the following effects.

The outermost periphery of the positive terminal plate is gradually thinner toward the tip, and is integrated by welding to match the rounded shape of the shoulder of the positive can, so that the outer periphery of the positive terminal plate When the heat-shrinkable label is covered with a heat-shrinkable label, the shoulder portion is rounded, so it will shrink according to its external shape and will not tear. Therefore, the defect rate in this process is reduced and the product yield is improved.

Furthermore, since there is no gap at the joint between the positive electrode can and the positive terminal plate, the heat-shrinkable label will not be dented in this area, and the appearance will be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of the label jacket type cylindrical battery according to this invention, Fig. 2 is a partially sectional exploded perspective view showing the main parts of the label jacket type cylindrical battery, and Fig. 3 1 is a partial cross-sectional view showing a problem with a conventional label jacket type cylindrical battery. 10...Positive electrode can, 10a...Side part, 10b...
Bottom part, 10c... Shoulder part, R1... Shoulder curvature, 1
2...Positive terminal plate, 14...Heat shrink label, 22
...Outermost circumference, R2... Curvature of outermost circumference.

Claims (1)

[Claim for Utility Model Registration] A positive terminal plate is integrally welded to the bottom of a cylindrical positive electrode can that also serves as a case for the active material, and the outer periphery of the positive electrode can is covered with a heat-shrinkable label. In a label jacket type cylindrical battery in which an edge of a shrinkable label is bent to cover the peripheral edge of the positive electrode terminal plate, the positive electrode terminal plate corresponds to the diameter of the bottom surface of the positive electrode can, and The outermost peripheral part is formed in a curved state along the rounded shape of the shoulder formed between the bottom surface and the side part of the positive electrode can, and the outermost peripheral part is formed to become gradually thinner toward the tip. A label jacket type cylindrical battery characterized by: