JPH0831465A - Cylindrical air battery - Google Patents

Abstract

(57) [Abstract] [Purpose] A porous resin layer or non-woven fabric having air permeability is used to cover and coat the air intake holes provided in the positive electrode case to protect the membrane in the positive electrode case and prevent leakage due to membrane destruction. It is possible to easily provide a highly reliable cylindrical air battery that prevents liquid phenomenon and is excellent in discharge performance and safety. A metal positive electrode case 8 having an air intake hole 15 is covered and insulated with a porous resin layer 16 having air permeability so that the air intake hole 15 of the positive electrode case 8 is hidden in appearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical air battery having a metal positive electrode case with an air intake hole.

[0002]

2. Description of the Related Art Generally, a container of a cylindrical air battery uses a positive electrode case made of metal which serves as a positive electrode. The caulking portion of the positive electrode case is close to a metal bottom plate which is a negative electrode terminal. Therefore, if the battery is used without an exterior, it may cause an external short circuit when loading into a device or when using multiple batteries at the same time. There is a risk of problems such as being unable to remove or leaking liquid. Therefore, it is essential for a cylindrical air battery to insulate the positive electrode case with an insulating material.

Further, when the air intake hole is exposed to the outside, needle-like foreign matter may pierce the positive electrode (air electrode) inside the air hole from the outside before and after using the battery.
In addition, since it is expected that a person will intentionally prick, it is better to block the air intake hole of the positive electrode case so that it cannot be seen from the outside.

However, conventionally, as shown in FIG. 2, a large number of air intake holes 15 are provided on the side surface of the metal positive electrode case 8 of the cylindrical air battery so as to take in oxygen, which is a positive electrode active material, inside the battery. In order to insulate without removing the heat-shrinkable resin label or heat-shrinkable resin tube 16 on the positive electrode case 8 made of metal.
A positive electrode case 8 made of metal such as A
A hole 15A, which is an opening, was placed in the label or tube portion at a position corresponding to the air intake hole 15, and the position was accurately aligned with the position of the air intake hole 15 of the positive electrode case. Therefore, there were problems in assembly work and mass production.

[0005]

A conventional problem to be solved by the present invention is that the holes formed in the insulating outer casing are aligned with the air intake holes of the positive electrode case and the outer casing is complicated. is there.

Therefore, an object of the present invention is to realize a cylindrical air battery in which the insulating sheath is simply provided with no holes and the battery performance is sufficiently taken out.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention relates to a first aspect of the invention, in which a cylindrical air electrode is inserted and a large number of air intake holes are formed on the sides. The metal positive electrode case having the above is covered and covered with a porous resin layer having air permeability.

According to a second aspect of the present invention, the porous resin layer of the first aspect has a porosity of 15% or more and 30% or more.
% Or less, and the invention according to claim 3 is a heat-shrinkable adhesive label whose inner surface is partially coated with an adhesive material, and the invention according to claim 4 is claim 1 or The porous resin layer of the invention according to 2 is a heat-shrinkable tube.

According to a fifth aspect of the invention, a cylindrical positive electrode is inserted and a metal positive electrode case having a large number of air intake holes on its side is covered with a non-woven fabric having air permeability. Therefore, the invention according to claim 6 is an adhesive label in which the inner surface of the nonwoven fabric according to claim 5 is partially coated with an adhesive material.

[0010]

According to the present invention, since the porous resin layer or the non-woven fabric itself has the air permeability by the above-mentioned constitution, the air intake hole of the positive electrode case in which the cylindrical air electrode is inserted is formed into the porous resin layer. Alternatively, even if the non-woven fabric is blocked, air can be supplied to the internal cylindrical air electrode through the air intake hole. Therefore, the performance of the air battery can always be taken out normally.

[0011]

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

FIG. 1 is a half sectional view of an AA-type zinc-air battery to which the present invention is applied. Reference numeral 1 in FIG. 1 denotes a cylindrical air electrode, which is composed of a catalyst layer 2, a current collector layer 3, and a water-repellent fluororesin porous membrane layer 4 from the inside.

A metal outer cup 5 is inserted in the upper portion of the three-layered cylindrical air electrode 1, and then a metal inner cup 6 is inserted.
After inserting the inside of the cylindrical air electrode 1, the outer cup 5 is compressed on its side surface by a roller to form a groove 7 to form the cylindrical air electrode 1.
The inner cup 6 has its side surface expanded toward the cylindrical air electrode 1 by the expansion pin having an outer diameter larger than the inner cup inner diameter. As a result, the cylindrical air electrode 1 is pressure-bonded by the metal outer cup 5 and the inner cup 6 to be airtight, so that the sealing portion has excellent liquid leakage resistance. Further, a synthetic rubber sealant is applied from the inner side surface of the outer cup 5 to the bottom surface R for the purpose of improving the reliability of the liquid leakage resistance, thereby providing a highly reliable structure.

After the upper portion of the positive electrode case 8 is thus sealed, the projection portions 5A provided at three positions of the metallic outer cup 5 are spot-welded to complete current collection and conduction of the positive electrode.

The gelled zinc negative electrode 9 is filled inside via a separator 10 which is structured and inserted in the cylindrical air electrode 1. The lower part of the cylindrical air electrode 1 is sealed with a resin sealing body 11 and a positive electrode case 8. 12 is a plate, 13 is a sealant, 1
Reference numeral 4 is an air diffusion paper, 15 is an air intake hole of the positive electrode case 8, and the body of the positive electrode case 8 and the caulking portion of the positive electrode case 8 are covered and insulated by a porous resin layer 16. Further, the battery body is sealed by the hermetic seal 17 until the battery is used.

In this embodiment, the positive electrode case 8 was coated with a porous resin layer 16 made of polytetrafluoroethylene (hereinafter referred to as PTFE). As the exterior material, other than PTFE, tetrafluoroethylene and hexafluoroethylene were used. A resin material such as a copolymer with propylene or polyvinyl chloride can be used, and in general, it has a porosity of 15% or more and can be arbitrarily used.

In the porous resin layer 16 of this embodiment, the porosity is 2
Using PTFE manufactured in the range of 0 to 30% as a packaging material in the form of a tube, the unit cell before packaging is inserted into the tube, and then the tube is contracted by warm air to seal the side surface of the positive electrode case 8 and the sealing. It is attached so as to cover the caulked part.

When used as an exterior material, the porous resin layer 16 is partially coated with an adhesive and wound around the positive electrode case 8 as an adhesive label, and then the positive electrode case 8
It is also possible to attach the part protruding from the cover so as to cover the caulked part by sealing by heat shrinkage.

Similarly, a non-woven fabric such as polypropylene or vinylon is used as the exterior material of the porous resin layer, or the non-woven fabric is partially coated with an adhesive and wound around the positive electrode case 8 as an adhesive label. It is also possible to attach the portion protruding from the case 8 so as to cover the crimped portion by heat shrinkage.

As described above, the AA size cylindrical air zinc battery of the present invention, which is an embodiment of the present invention, and the air intake hole 15 of the positive electrode case 8 are previously prepared as shown in FIG.
With respect to each battery of the conventional example in which the positive electrode case 8 is provided with a polyethylene terephthalate resin tube 16A having a hole 15A formed in a portion corresponding to, a constant current continuous discharge test of 300 mA was performed to measure the electric capacity of each 10 batteries. The final voltage was 0.9 V and the results are shown in Table 1.
Further, in FIG. 2 showing a conventional example, the same components as those in FIG. 1 are designated by the same reference numerals and detailed description thereof is omitted.

[0021]

[Table 1]

As shown in Table 1, it is found that there is no particular difference in battery performance between the cylindrical air zinc battery of the embodiment of the present invention and the conventional cylindrical air zinc battery. As described above, in the case of the battery having the structure according to the present invention, by using the porous resin layer or nonwoven fabric having air permeability as the exterior material, the resin film corresponding to the air intake hole 15 of the positive electrode case 8 can be formed as in the conventional case. The battery can be easily packaged without preliminarily forming the hole 15A in the portion, and at the same time, the discharge performance of the battery can be stably taken out as usual.

[0023]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a metal positive electrode case having an air intake hole is coated and covered with a porous resin layer having air permeability or a non-woven fabric.
The battery can be easily packaged without making holes in the resin layer in advance, and at the same time, the discharge performance of the battery can be taken out the same as with conventional batteries. Or by covering with a non-woven fabric, it is possible to prevent foreign substances from invading from the outside by misuse or intentional purpose and prevent destruction of the air electrode. Can be provided.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view of a cylindrical zinc-air battery according to an embodiment of the present invention.

FIG. 2 is a half-sectional view of a cylindrical zinc-air battery in a conventional example.

[Explanation of symbols]

 1 Cylindrical air electrode 2 Catalyst layer 3 Current collector layer 4 Water repellent fluororesin porous membrane 5 Outer cup 6 Inner cup 8 Positive electrode case 9 Gel-like zinc negative electrode 15 Air intake hole 16 Porous resin layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Eda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A cylindrical shape in which a cylindrical air electrode is inserted and a metal positive electrode case having a large number of air intake holes on its side is covered and covered with a porous resin layer having air permeability. Air battery. 2. The porous resin layer has a porosity of 15% or more 3
It is 0% or less, The cylindrical air battery of Claim 1 characterized by the above-mentioned. 3. The cylindrical air battery according to claim 1, wherein the porous resin layer is a heat-shrinkable adhesive label whose inner surface is partially coated with an adhesive material. 4. The cylindrical air battery according to claim 1, wherein the porous resin layer is a heat-shrinkable tube. 5. A cylindrical air battery in which a cylindrical air electrode is inserted and a metal positive electrode case having a large number of air intake holes on its side is covered with a nonwoven fabric having air permeability. 6. The cylindrical air battery according to claim 5, wherein the non-woven fabric is an adhesive label having an air permeable property, the inner surface of which is partially coated with an adhesive material.