JPS62268071A - Air button cell - Google Patents

Abstract

PURPOSE:To enable a cell to correspond to any discharge of strong load or light one, by clamping a sealing plate housing a negative electrode active material and a positive electrode case, having an air supply port in a bottom part where a positive electrode and a separator are housed, together with an insulated sealing ring interposed in between, and installing a layer, regulating an air quantity, in the bottom face outside of the positive electrode case. CONSTITUTION:On the circumference of an air supply hole 8 serving as an admission passage of air and steam between a case inner part and the outside, there are provided with a secondary air regulating film 10 consisting of hermetical seal paper 9, applying a bonding agent to polyethylene to keep off evaporation of steam before application, and a porous fluorocarbon resin film and an air regulating layer 11 using porous fluorocarbon resin. Therefore, in case of light load, the air regulating layer at the case outside bottom, where an oxygen supply per unit time comes to a rate-determining step, works, while in case of strong load, the regulating layer at the case outside bottom is removed whereby air regulation can be done by the regulating film 10 inside the cell, therefore evaporation of water content in a battery electrolyte at the light load discharge is also regulable.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an air button battery.

2. Description of the Related Art Conventional air button batteries generally have a configuration as shown in FIG. In the figure, 7 is the positive electrode case;
8 is an air diffusion paper placed on the inner bottom of the case 7, and 8 is an air supply hole for introducing air into the battery. Oxygen introduced into the cell through the air supply hole 8 passes through the porous fluororesin membrane 10 and is supplied to the reaction portion of the catalyst layer 5. The porosity of the porous fluororesin membrane of 10 regulated the amount of air permeation and the evaporation of water in the electrolyte in the separator 4 and the negative active material 1 to the outside of the battery.

In the configuration of such a conventional air button battery, the porous fluororesin membrane 10 must be in a state where it can supply the required amount of oxygen per unit time even during heavy load discharge. The amount of evaporation of moisture in the electrolyte also increases. Therefore, there is a problem in that the discharge duration during load discharge becomes significantly shorter than the calculated value due to moisture dissipation, evaporation, and the like.

The following methods have been proposed in the past to solve this problem.

(1); Pressurize the porous fluororesin membrane shown in Figure 3.
A method of compressing the battery to minimize porosity and prevent moisture from evaporating inside the battery.

(2); A method in which a homogeneous membrane such as polyethylene is used instead of a porous fluororesin membrane, and only the amount of oxygen necessary for the reaction is diffused into the catalyst layer.

Problems to be Solved by the Invention However, methods (1) and (2) above involve materials that are incorporated inside the battery, and the internal structure cannot be adjusted individually due to changes in external resistance such as heavy or light loads. There was a problem in that it had to be changed and could not handle both external resistances.

The present invention solves these problems, and aims to provide an air button battery that can handle discharge under both heavy loads and light loads.

Means for Solving the Problem In order to solve this problem, the present invention incorporates a membrane inside the battery that supplies the amount of oxygen per unit time required for heavy load discharge, and provides the unit time required for light load discharge. An air regulation layer that only allows the passage of oxygen per hour is glued to the outside bottom of the case.

Function: With this configuration, the air regulation layer at the bottom of the outside of the case works for light loads, where the rate-limiting step is the supply of oxygen per unit time, and for heavy loads, the regulation layer at the bottom of the outside of the case is removed. This allows the regulation film 10 inside the battery to regulate the evaporation of water in the electrolytic solution during light load discharge.

Embodiment FIG. 1 is a sectional view of an air button battery according to an embodiment of the present invention. In Fig. 1, 1 is a gel-like mixture of zinc whose surface is amalgamated as a negative electrode active material and a potassium hydroxide aqueous solution as an electrolyte. 2 is a copper-stainless steel-Ninokel clad plate that houses the negative electrode active material. A sealing plate made by pressing a disc with a plate thickness of 0.25 JIs, 3 an insulating sealing ring made of injection molded nylon, 4 a separator made of porous polyethylene, 5 a mixture of graphite or acetylene black, activated carbon, and a binder. It is a catalyst layer that is pressed onto a metal net and punched out. 6 is a diffusion paper that diffuses air, and 7 is a plate with a thickness of 0.25 that houses 4, 5, 6, and 10.
A steel plate of size M was press-worked, and the central part of the bottom protruded inward by 0.2 m. This case was fastened to a sealing plate with an insulating sealing ring containing No. 1 using a mold. 8 is the air between the inside and outside of the case.

9 is a sealing paper made of polyethylene coated with adhesive to prevent water vapor from evaporating before use; 1o is a thickness of 0.1701. The secondary air regulation membrane is made of a porous fluororesin membrane with a porosity of 16%. No. 11 was an air regulation layer made of porous fluororesin having a thickness of 0.111B and a porosity of 3%, and was adhered to the bottom of the case using an adhesive.

Next i/7: Explain the air regulation layer. FIG. 2A is a plan view of the air regulation layer, B is a cross-sectional view thereof, and 12 is a thickness of 0 and 1.
jlB1 A homogeneous membrane 13 made of porous fluororesin with a porosity of 3% has a thickness of 0.08 JI with a 1.5-diameter hole in the center to protect the surface in order to maintain the surface condition of 12.
The polypropylene protective film 14 of B is a polyamide adhesive that adheres 12, 13, 12, and the positive electrode case 7.

The porous resin membrane that forms the center of the air regulation layer is made of PTFE.
In addition to the 7-carbon resin film typified by, polyethylene or polyester may also be used.

In this way, the air regulation layer 11 shown in FIG. 1 is made and adhered to the air button battery, and the seal paper 9 is attached to complete the battery.

Here, there is a case where there is no air regulation layer at the bottom of the conventional case, and
Table 1 shows the discharge time of continuous discharge of 15 min with a battery equipped with an air regulation layer.

Table 1 (15Ω, 20″G45% continuous discharge)
Effects of the Invention As described above, according to the present invention, for light loads, only the seal paper is removed, and for heavy loads, the seal paper and air regulation layer are removed. It can correspond to the supply of air amount.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an air button battery according to an embodiment of the present invention, FIGS. 2A and B are a plan view and a sectional view of the air regulation layer in FIG. 1, and FIG. 3 is a sectional view of a conventional air button battery. It is a diagram. 1... Negative electrode active material, 2... Sealing plate, 3...
・Insulating sealing ring, 4...Separator, 5...
・Catalyst layer, e...Air diffusion paper, 7...Positive electrode case, 8...Air supply hole, 9...Airtight seal paper, 10...Secondary Air regulation membrane, 11...
Air regulation layer, 12...Porous 7-layer resin membrane, 13
...Protective film, 14...Adhesive. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
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Claims (4)

[Claims] (1) A sealing plate that stores the negative electrode active material and a positive electrode case that stores the positive electrode and the separator and has an air supply hole at the bottom are fastened together with an insulating sealing ring interposed between them, and the bottom of the positive electrode case is connected to the outside of the bottom surface of the positive electrode case. , an air button battery characterized by being equipped with a layer that regulates the amount of air. (2) The air button battery according to claim 1, wherein the layer regulating the amount of air is a porous resin homogeneous membrane. (3) The porous resin homogeneous membrane is made of PTFE, polyethylene,
The air button battery according to claim 2, which is made of polyester. (4) The air button battery according to claim 2, wherein a protective film is provided on one or both sides of the layer that regulates the amount of air.