JPH05121057A - Seal for air cell - Google Patents

Abstract

(57) [Abstract] [Purpose] The through hole 4 of the air battery 4 including the positive electrode case 4a having the through hole 4b for taking in air at the bottom.
A seal for sealing b, in order to prevent the seal from peeling off from the battery surface due to external stress such as impact or vibration in the knob 3 of the sealing material 1 made of a gas-impermeable plastic film. , Sealing material 1
The thickness of the knob portion 3 is examined to provide an air battery having excellent battery performance. According to the present invention, even when a large vibration or the like is applied to the grip portion 3 of the seal 1 during transportation of the battery 4 or during handling of the battery 4 such as packing work, the thickness of the grip portion 3 of the seal material 1 is 0. By using a thin sheet of 0.04 to 0.09 mm, peeling can be prevented and the bottom of the positive electrode case 4a and the seal can be sufficiently adhered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a seal for an air battery used to seal a through hole that has been opened to take in air into a positive electrode case of a button type air battery.

[0002]

2. Description of the Related Art Conventionally, as a seal for an air battery, an adhesive is applied on one surface to seal a through hole at the bottom of a positive electrode case, and a seal having a knob portion protruding from the outer periphery of the air battery is used. . The reason for using a seal having such a gripping portion is that air needs to be diffused into the battery when the battery is used. Therefore, a gripping portion that peels off the seal and performs a seal peeling action for taking in air from the through hole. Because it requires.

The larger the area of the knob for peeling the seal, the easier it is to pick with a finger. Therefore, the user has been required to increase the area of the knob.

[0004]

However, since the bonding area between the seal for sealing the through hole in the bottom of the air battery positive electrode case and the case bottom is determined by the battery outer diameter, the battery outer diameter is very small. In a battery, when the area of the grip of the seal is increased, it may become larger than the area of contact between the bottom of the positive electrode case and the seal. Also, if a large vibration is applied to the battery during transportation, or if a sticker with a thick grip is used during battery handling such as packing, the external stress applied to the grip may cause damage to the bottom of the positive electrode case. It becomes a force for peeling the seal, resulting in insufficient adhesion between the two.

As described above, in the case of a battery having a very small battery outer diameter, the thickness of the grip portion for peeling off the seal often causes insufficient adhesion between the bottom of the positive electrode case and the seal during transportation or during work. Let Such inadequate adhesion of the seal leads to self-discharge and evaporation of the electrolytic solution due to intrusion of air from the through hole at the bottom of the battery during storage of the battery, resulting in deterioration of the battery.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a seal for sealing a through hole at the bottom of a positive electrode case of an air battery, which is a sealing material made of a gas-impermeable plastic film having an adhesive applied on one surface. The problem is solved by configuring the thickness of the knob portion protruding from the outer periphery of the air battery of 0.04 to 0.09 mm to be thin.

[0007]

According to the present invention, even if a large vibration is applied during transportation of a battery, or if a large area of the gripping portion becomes an obstacle during handling of the battery during packing or the like, the thickness of the gripping portion is 0.04.
By adopting a thin air battery seal with a thickness of up to 0.09 mm, external stress applied to the knob is absorbed by the knob.

As a result, even in the case of a battery having a very small outer diameter, the close contact between the bottom of the positive electrode case and the seal is not peeled off, and the close contact can be sufficiently maintained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the embodiment according to the present invention will be described below.

FIG. 1 and FIG. 2 show an example of implementation according to the present invention. In the figure, 1 is a gas-impermeable sealing material made of a polyethylene terephthalate (polyester) film, and has a material thickness of 0.04 to 0.09 mm. The gas-impermeable sealing material 1 is usually made of a plastic material such as polyester, polyethylene, or vinyl chloride, or a material obtained by depositing aluminum on these materials. Reference numeral 2 denotes an adhesive layer, which is composed of an acrylic ester-based pressure-sensitive adhesive, and generally uses a removable type pressure-sensitive adhesive having a thickness of about 0.02 mm. Denoted at 3 is a knob portion, which is used when the sealing material 1 is punched out into a predetermined shape with a Thomson die or the like.
It is formed by punching at the same time. Reference numeral 4 is a battery, and the through hole 4b at the bottom of the positive electrode case 4a is adhesively sealed with the seal of this embodiment.

Next, a conventional seal (material thickness 0.10 m
m) and the seal according to the present embodiment (material thickness 0.04 to 0.
100 pieces each of which used 09 mm) were stored in a packaging tray container, dropped from a height of 1 m onto a concrete surface 20 times, and the numbers of peeled seals at that time were compared.
The results are shown in Table 1.

[0012]

[Table 1]

As is clear from Table 1, in the case of the air battery using the conventional seal, many peeling of the seal occurred, whereas in the case of the air battery using the seal according to the present embodiment, the No peeling occurred.

[0014]

INDUSTRIAL APPLICABILITY As described above, the present invention is a seal for an air battery used to seal the through hole of an air battery provided with a positive electrode case having a through hole for taking in air at the bottom, The thickness of the knob portion of the sealing material, which is made of a gas-impermeable plastic film coated with the adhesive on the outer surface of the air battery, is 0.04 to 0.09 m.
By setting m, flexibility can be increased, and an air battery seal that does not separate from the air battery even when stress such as shock or vibration is applied can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of an air battery including a seal according to an embodiment of the present invention.

FIG. 2 is a bottom view of an air battery including a seal according to an embodiment of the present invention.

[Explanation of symbols]

 1 Sealing Material 2 Adhesive Layer 3 Handle 4 Battery 4a Positive Case 4b Through Hole

Claims (1)

[Claims] 1. A seal for an air battery, which is used for sealing the through hole of an air battery having a positive electrode case having a through hole for taking in air at the bottom, the gas having an adhesive applied on one side thereof. A seal for an air battery, wherein a thickness of a knob portion of the sealing material made of an impermeable plastic film, which protrudes from the outer periphery of the air battery, is 0.04 to 0.09 mm.