JP3136891B2 - Button type air battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a button-type air battery.
In particular, the present invention relates to a sealing structure using an insulating packing having a substantially L-shaped cross section.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional button type air battery.
Shown in

1 is a negative electrode case, 2 is a negative electrode made of zinc and an alkaline electrolyte, 3 is an insulating gasket having a substantially L-shaped cross section,
4 is an air electrode comprising a catalyst layer and a water-repellent layer, 5 is a separator, 6 is a positive electrode case, 7 is a water-repellent film for preventing electrolyte from leaking out of the battery, 8 is air diffusion paper, 9 is Convex portions 10 formed concentrically upward from the bottom surface of the positive electrode case are air intake holes provided on the bottom surface of the positive electrode case.

[0004] The air diffusion paper 8 is accommodated in a concave portion formed by a convex portion 9 on the bottom surface of the positive electrode case so that the air diffusion paper 8 is not compressed and the air diffusion function is deteriorated.

A sheet-like water-repellent film 7, an air electrode 4 and a separator 5 are laminated on the upper part of the air diffusion paper 8, and the air electrode 4 and the separator 5 are located above the projection 9 on the bottom surface of the positive electrode case. It is located in.

Then, the air electrode 4 and the separator 5 are pressed and clamped between the flat bottom portion of the insulating gasket 3 and the convex portion 9 on the bottom surface of the positive electrode case to fix them, thereby closing the battery and preventing leakage of the electrolyte. Preventing.

[0007]

However, in the button-type air battery of this construction, as shown in FIG. 5, an enlarged cross-sectional view of the bottom of the insulating gasket, the gap between the convex portion on the bottom surface of the positive electrode case and the side surface of the positive electrode case. A gap was formed between the bottom portion of the insulating gasket, the positive electrode case, and the air electrode in the concentric concave portion.

For this reason, the air electrode 4 bends in the vertical direction on both sides of the convex portion 9, causing distortion and deformation of the air electrode. Electrolysis is performed through a gap formed between the insulating gasket, the positive electrode case and the air electrode. The liquid leaked, and the leak resistance of the battery was reduced.

If the deformation of the air electrode is large, the compressive force of the negative electrode containing the electrolyte is reduced by the air electrode, so that the electrolyte is excessively stagnated in the deformed portion, and the accumulated electrolyte causes gas permeation to the air electrode. And the discharge characteristics of the battery were reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a button type air battery in which air diffusion paper is accommodated in a concave portion formed by a convex portion on the bottom surface of a positive electrode case is provided.
An air electrode is fixed so as not to be curved by an insulating gasket and a convex portion on the bottom surface of a positive electrode case, and the battery is sealed in a liquid-tight manner to provide a button-type air battery excellent in liquid leakage resistance and discharge characteristics.

[0011]

In order to solve the above-mentioned problems, a button-type air battery according to the present invention has an air intake hole on the bottom surface and a concentric convex portion formed from the bottom surface toward the inside of the battery. The positive electrode case, the air diffusion paper accommodated in the concave portion of the positive electrode case formed by the convex portion, and a sheet-shaped sheet disposed on the air diffusing paper and the convex portion and larger than the concentric circle formed by the convex portion. An air electrode, a negative electrode case accommodating a negative electrode therein, and an insulating gasket having a substantially L-shaped cross section for pressing the peripheral portion of the air electrode from above, and insulating between the positive and negative electrode cases. The bottom section is convex toward the concentric concave portion between the convex portion on the bottom surface of the positive electrode case and the side surface of the positive electrode case.

[0012]

According to the button type air battery of the present invention, in the positive electrode case having the convex portion formed concentrically from the bottom surface to the inside, the peripheral portion of the sheet-shaped air electrode larger than the concentric circle is connected to the positive electrode. It is pressed and fixed with a convex insulating gasket toward a concentric concave portion between the convex portion on the bottom surface of the case and the side surface of the positive electrode case.

For this reason, since the periphery of the air electrode is sandwiched between the insulating gasket and the positive electrode case so as to be pulled downward, the air electrode does not bend in the vertical direction, and a part of the air electrode is electrolyzed. Excessive accumulation of liquid can be prevented, and the three-phase interface of gas-liquid-solid phase at the air electrode can be kept good, thereby improving the discharge characteristics of the battery.

In the concentric concave portion between the convex portion on the bottom surface of the positive electrode case and the side surface of the positive electrode case, the bottom portion of the insulating gasket,
Since the peripheral edges of the positive electrode case and the air electrode are in close contact with each other without any gap, this portion can be completely sealed, and an air battery having a liquid-tight state and excellent liquid leakage resistance can be provided.

[0015]

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

FIG. 1 is an enlarged sectional view of the bottom of the insulating gasket of the button type air battery of the present invention. Reference numeral 3 denotes an insulating gasket of the present invention provided with a projection 12 having a shape along the cross-sectional shape of the concentric recess 11 between the projection 9 on the bottom surface of the positive electrode case and the side surface of the positive electrode case.

As shown in FIG. 1, since the peripheral portion of the air electrode 4 is sandwiched between the convex portion 12 of the insulating gasket 3 and the convex portion 9 on the bottom surface of the positive electrode case so as to be pulled downward, the air electrode is curved. It can be fixed without doing.

Further, since the peripheral portion of the air electrode is in close contact with the insulating gasket and the positive electrode case without any gap, the liquid leakage resistance of the battery can be improved by complete sealing.

On the other hand, a button-type air battery as shown in FIG. 4 was prepared as a comparative battery, and this was used as a conventional battery.

Here, the size of the button-type air battery of the present invention and the conventional one is 7.9 mm in diameter and 5.4 mm in height.

Next, the present invention and the conventional battery were
A leak resistance test was performed using 0 samples each.

In the leak resistance test, the battery was sealed at a temperature of 60 ° C. and a humidity of 90% in an atmosphere of 200, 400, 600, 800, 1000, 12 with the air intake hole of the battery sealed.
After storage for 00 hours, the number of leaked liquids at each time was examined.

The results are shown in (Table 1).

[0024]

[Table 1]

As shown in (Table 1), in the battery of the present invention, the air electrode is fixed between the insulating gasket and the positive electrode case without any gap, thereby improving the liquid leakage resistance of the battery. I was able to.

Next, using the battery of the present invention and the conventional battery,
Discharge was performed at a resistance of 620 Ω in an atmosphere at 70 ° C. and a humidity of 70%, and the voltage change at this time was examined.

FIG. 2 shows the result. As shown in FIG. 2, in the battery of the present invention, the peripheral edge of the air electrode is sandwiched between the insulating gasket and the positive electrode case so as to be pulled downward, so that the air electrode is fixed without distortion, and The discharge characteristics of the battery could be improved by preventing the electrolyte solution from being excessively accumulated in part.

FIG. 3 shows another example of the button-type air battery of the present invention. As shown in FIG. 3, reference numeral 3 denotes an insulating gasket having a flat bottom, and reference numeral 13 denotes an alkali-resistant fluororesin housed in a concentric concave portion 11 between the convex portion 9 on the bottom surface of the positive electrode case and the side surface of the positive electrode case. O-ring. For this reason, since the peripheral edge of the air electrode 4 is fixed to the bottom of the insulating gasket 3 in close contact with the O-ring 13, the liquid leakage resistance of the battery can be improved. Further, when the insulating gasket is pressed, the O-ring is compressed. At this time, the peripheral portion of the air electrode is pulled downward and fixed by the downward force, so that no distortion occurs in the air electrode.

[0029]

As described above, according to the button-type air battery of the present invention, in the positive electrode case having the convex portion formed concentrically from the bottom surface to the inside, the periphery of the sheet-shaped air electrode larger than the concentric circle is provided. The portion is sandwiched and fixed between the insulating gasket and the positive electrode case without any gap.

Therefore, the electrolyte does not leak from the gap between the air electrode, the insulating gasket and the positive electrode case.

Further, since the air electrode is fixed without being distorted, it is possible to prevent the electrolyte from being excessively accumulated in a part of the air electrode, and it is possible to prevent the gas-liquid-solid phase at the air electrode from having a three-phase interface. And the discharge characteristics of the battery can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of the bottom of an insulating gasket of a button type air battery of the present invention.

FIG. 2 is a diagram showing discharge characteristics of the present invention and a conventional button type air battery.

FIG. 3 is a diagram showing another example of the button-type air battery of the present invention.

FIG. 4 is a cross-sectional view of a conventional button type air battery.

FIG. 5 is an enlarged sectional view of the bottom of the insulating gasket of the battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Negative electrode case 2 Negative electrode 3 Insulating gasket 4 Air electrode 5 Separator 6 Positive case 7 Water-repellent film 8 Air diffusion paper 9 Convex part on the bottom of positive case 10 Air intake hole 11 Concentric concave part 12 Convex part on bottom of insulating gasket 13 O-ring

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-49578 (JP, A) JP-A-60-63880 (JP, A) JP-A-64-35876 (JP, A) JP-A-2- 253573 (JP, A) Fully open 1979-146313 (JP, U) Fully open 1979-38623 (JP, U) Fully open 1979-69330 (JP, U) Fully open 1979-131925 (JP, U) Shokai 55-57961 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01M 2/08 H01M 12/06

Claims (4)

(57) [Claims] 1. A positive electrode case having an air intake hole on the bottom surface and a convex portion formed concentrically from the bottom surface toward the inside of the battery; and air contained in a concave portion of the positive electrode case formed by the convex portion. A diffusion paper, a sheet-shaped air electrode that is arranged on the air diffusion paper and the convex portion and is larger than a concentric circle formed by the convex portion, a negative electrode case containing a negative electrode therein, and a peripheral edge of the air electrode facing upward. And positive,
An insulating gasket having a substantially L-shaped cross section that insulates between the negative electrode cases, wherein a bottom cross section of the insulating gasket is convex toward a concentric concave portion between a convex portion on the bottom surface of the positive electrode case and a side surface of the positive electrode case. Button type air battery. 2. The button shape according to claim 1, wherein the cross section of the bottom of the insulating gasket has a convex shape that follows the cross-sectional shape of the concentric concave portion between the convex portion on the bottom surface of the positive electrode case and the side surface of the positive electrode case. Air battery. 3. The button-type air battery according to claim 1, wherein a bottom section of the insulating gasket has a substantially triangular convex shape inclined toward the outside of the gasket. 4. A positive electrode case having an air intake hole on the bottom surface and a convex portion formed concentrically from the bottom surface toward the inside of the battery; and air accommodated in a concave portion of the positive electrode case formed by the convex portion. A diffusion paper, a sheet-shaped air electrode that is arranged on the air diffusion paper and the convex portion and is larger than a concentric circle formed by the convex portion, a negative electrode case containing a negative electrode therein, and a peripheral edge of the air electrode facing upward. And positive,
An insulating gasket having a substantially L-shaped cross section that insulates between the negative electrode cases. An O-ring is housed in a concentric concave portion between the convex portion on the bottom surface of the positive electrode case and the side surface of the positive electrode case. A button-type air battery that presses and holds the periphery of the air electrode.