JP2001243927A - Alkaline cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of outer package of an alkaline cell clad in a heat contraction member. SOLUTION: The alkaline cell seals an opening part of a metal cell case 1 containing an electricity-generating element by a hat-shaped metal sealing plate 7 also serving as a negative terminal through an insulating gasket 6. By doubly packaging the metal cell case 1 with heat contraction material 8, damages to outer packages due to vibration of cells during transport or due to coil spring terminal of an equipment the cell is used for are avoided, and as a result, reliability of the outer package is enhanced preventing generation of an outside short circuit between a positive electrode and a negative electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an alkaline dry battery packaged with a heat-shrinkable member such as a shrink label or a shrink tube.

[0002]

2. Description of the Related Art Conventionally, in an alkaline dry battery, an outer structure has been simplified in order to increase the diameter of a metal battery case. For example, a shrink label or a shrink formed by depositing a metal to form a pattern or the like is used. The metal battery case was covered and insulated by the tube. As such a battery, a shrink label is adhered to the side surface of a battery case also serving as a positive electrode terminal containing a power generating element with an adhesive, and a label-covered battery in which upper and lower protruding portions are thermally shrunk, or a cylindrical heat battery. There is a tube exterior battery in which a battery is housed in a shrinkable tube and the tube is heated and shrunk. These batteries have a single heat-shrinkable member.

FIG. 5 shows an example of such an alkaline dry battery. In FIG. 5, reference numeral 1 denotes a metal battery case that also serves as a positive electrode terminal. The battery case 1 is loaded with a positive electrode mixture 2 mainly composed of manganese dioxide, a separator 3 and a gelled zinc negative electrode 4, and the opening of the battery case has a negative electrode terminal in which a negative electrode current collecting rod 5 and an insulating gasket 6 are combined. Is sealed by a metal sealing plate 7 which also functions as a metal plate. The current collecting rod 5 is joined to the metal sealing plate by spot welding. Reference numeral 8 denotes a resin label that covers the battery case, and is covered with the battery case 1 by heat shrinkage. The lower end is in close contact with the outer periphery of the closed surface of the case 1, and the upper end is a gasket 6
To cover the end face of the caulked opening of the case 1 and further extends to the metal sealing plate 7 side.

[0004]

In the above-described dry battery which is single-packed with a heat-shrinkable member, friction caused by vibration or the like during transfer of the battery causes the outer surface of the outer label shrinking portion to cover the opening of the case. Cracks may occur or labels or tubes may come off. In particular, when the contracted portion of the exterior member that covers the opening end surface of the positive electrode case protrudes from the negative electrode sealing plate, the tube or label is peeled off by the device-side coil spring-shaped terminal when the battery is inserted into or removed from the battery-using device. It is susceptible to damage such as tearing.
In such a case, since the sealing portion of the positive electrode case and the negative electrode sealing plate are both made of metal, the coil spring-like terminal on the instrument contacts the negative electrode sealing plate and the opening of the positive electrode case, and an external short circuit occurs between the positive and negative electrodes. This often causes rupture or leakage of the electrode. In this respect, the reliability of an alkaline battery packaged with a heat-shrinkable member such as a shrink label or a shrink tube is inferior to that of a metal packaged battery.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve the reliability of an alkaline battery packaged with a heat-shrinkable member.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an alkaline dry battery in which the opening of a metal battery case for accommodating a power generating element is sealed with a hat-shaped metal sealing plate also serving as a negative electrode terminal via an insulating gasket. The battery case is characterized in that it is double-wrapped with a heat-shrinkable member.

Since the alkaline dry battery of the present invention is double-wrapped with a heat-shrinkable member, for example, cracks may occur on the outer surface of the shrinkable outer label covering the opening of the case due to friction caused by vibration during the transfer of the battery. In addition, the inconvenience of peeling off the label or the tube is eliminated. In addition, when a battery is taken in and out of a battery-using device, the battery tube or label is not peeled off by a coil spring-like terminal or the like on the device as in the related art, and damage such as breakage does not occur. External short circuit between the positive and negative electrodes of the battery can be prevented.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a portion of an alkaline dry battery of the present invention in which an opening of a battery case is sealed by a metal sealing plate 7. And case 1
Are adhered so as to cover the end face of the opening.

FIG. 2 is a view for explaining an example in which one heat-shrinkable member is double coated on the outside of the battery case. The heat shrink label 8 is doubly wound around the battery case 1. Although not shown here, the upper and lower ends of the heat-shrinkable label are in close contact with each other so as to cover the outer peripheral portion of the closed surface of the case 1 and the end surface of the opening due to the heat shrinkage as described above. FIG. 3 is a longitudinal sectional view (a) and a transverse sectional view (b) of two heat-shrinkable labels 8 wound in a single layer and overlapped only at the joint. FIG. 4 shows one heat-shrinkable label wound,
It shows an example further covered with a heat-shrinkable tube, and shows a longitudinal sectional view (a) and a transverse sectional view (b) thereof.

[0010] In the battery double-coated with the heat-shrinkable member as described above, since the external impact is received by the double displacement of the exterior, the inner label is protected by the friction during transportation, and the insulation is insulated. The effect as a member can be maintained. Also, when the battery is inserted into or removed from the battery-equipped appliance, even if the coil spring-like terminal on the appliance may cause damage such as peeling off of the tube or label, the double outer casing The label reduces the weight, protects the inner label, and does not cause an external short circuit between the positive and negative electrodes as in the related art.

[0011]

As described above, according to the present invention,
Since the heat-shrinkable member provided on the alkaline dry battery is hardly damaged, it is possible to prevent various problems due to the damage of the conventional case, for example, external short circuit between the positive and negative electrodes, and to improve the reliability of the battery. Property can be ensured.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of an alkaline dry battery according to one embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a state of an exterior of a heat-shrinkable member according to the present invention.

3A and 3B are diagrams illustrating another example of the state of the exterior of the heat-shrinkable member according to the present invention, wherein FIG. 3A is a cross-sectional view and FIG.

4A and 4B are diagrams illustrating another example of the state of the exterior of the heat-shrinkable member according to the present invention, wherein FIG. 4A is a cross-sectional view and FIG.

FIG. 5 is a cross-sectional view of a conventional alkaline dry battery.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal battery case, 2 ... Positive electrode mixture, 3 ... Separator, 4 ... Gelled zinc negative electrode, 5 ... Negative electrode current collecting rod, 6 ... Insulating gasket, 7 ... Metal sealing plate, 8 ... Heat shrinkable member.

Claims (4)

[Claims] 1. An alkaline dry battery in which an opening of a metal battery case accommodating a power generating element is sealed by a hat-shaped metal sealing plate also serving as a negative electrode terminal via an insulating gasket, wherein the metal battery case is formed of a heat-shrinkable member. An alkaline dry battery, which is double-wrapped. 2. The alkaline dry battery according to claim 1, wherein the metal battery case is double-wrapped using one heat-shrinkable label. 3. The alkaline dry battery according to claim 1, wherein the metal battery case is single-packed using two heat-shrinkable labels. 4. The alkaline dry battery according to claim 1, wherein the battery is packaged with one heat-shrinkable label and further packaged with a heat-shrinkable tube.