CN2462550Y

CN2462550Y - Zinc-air battery

Info

Publication number: CN2462550Y
Application number: CN 00245135
Authority: CN
Inventors: 甘立才; 李平; 孙唯
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-20
Filing date: 2000-11-20
Publication date: 2001-11-28
Anticipated expiration: 2010-11-20

Abstract

The utility model relates to a zinc-air battery. The air electrode 8 is a circular cylinder with one end open, and the other end is hermetically connected with the nonmetal base 5. The air electrode 8 has micropores on its cylinder, porous current collector on its outer surface, catalytic film on its inner surface, which is connected with cylindrical diaphragm 7, zinc electrode 6 filled in diaphragm 7, negative electrode cap 9 connected with electrode whisker 4, sealing sleeve 10 sealed with the open end of air electrode cylinder and electrode cap 9, battery case 3 connected with sealing sleeve 10 and base 5, and positive electrode cap 1 and air inlet 2 on the case. The air inlet 2 is communicated with an air gap formed by the base 5 and the shell. Reasonable structure, simple manufacturing process, good sealing effect and suitability for industrial production.

Description

Zinc-air battery

The utility model relates to a battery especially relates to a cylindrical zinc-air battery.

A zinc-air battery is a chemical battery that is composed of a positive electrode, a negative electrode, a separator, and an electrolyte solution. The anode of the battery adopts an adsorption catalysis film as a carrier to directly absorb oxygen in the air to participate in a discharge reaction, the cathode is a zinc powder porous electrode with high activity, a diaphragm is arranged between the anode and the cathode, and an electrochemical reaction is completed in an alkaline potassium hydroxide material.

The positive electrode only consumes oxygen from air in the reaction, which is inexhaustible, as long as the air electrode is kept normal, the battery capacity is only determined by the quantity of zinc in the negative electrode, so that the zinc-air battery has the characteristics of high capacity, light weight and high specific energy. In addition, the battery has the advantages of wide and stable discharge voltage range, rich raw materials, low price and the like, and is one of the preferred varieties of high-energy batteries developed in various battery communities.

The existing zinc-air battery is non-circular, the contact area of the current collector is small, the air enters the electrode unevenly, the battery capacity and the specific energy are not high, the production is inconvenient, and the cost is high.

The utility model aims at providing a circular air electrode cylinder zinc-air battery with high capacity and large specific energy. The battery can meet the following requirements that the structural design is reasonable, the manufacturing process is simple, the sealing effect is good, the large-scale industrial production can be carried out, the external dimension is standardized, and the battery can be used interchangeably with corresponding batteries sold in the market.

The utility model is realized in this way

The air electrode 8 is a round cylinder with an open end, the other end is connected with the non-metal base 5, the cylinder of the air electrode 8 is provided with micropores, the outer surface of the cylinder is covered with a porous current collector 12, the inner surface of the cylinder is provided with a catalytic film, a cylindrical diaphragm 7 is arranged in the catalytic film, a pasty zinc electrode 6 is filled in the diaphragm 7, a negative electrode cap 9 is connected with an electrode whisker 4, a sealing sleeve 10 is hermetically connected with the open end of the cylinder of the air electrode and the electrode cap 9, the battery shell 3 is connected with the sealing sleeve 10 and the base 5, the shell is provided with an anode cap 1 and an air inlet 2, and the air inlet is communicated with an air gap formed by the base 5 and the shell.

The current collector 12 is a porous metal belt which is directly contacted with the metal shell 3, and the catalytic film, the waterproof breathable conductive film air electrode 8 and the porous metal belt 12 are sequentially overlapped.

In the air gap formed by the base 5 and the shell, a ventilated membrane 11 is arranged below the air inlet 2.

The electrode whisker 4 is spirally lead fluid and is welded with the electrode cap 9.

The utility model has the characteristics of as follows:

1. the anode adopts a circular air electrode, and the battery shell also adopts a cylindrical shape, so that the mechanical production is facilitated, and the efficiency is improved.

2. After the external dimension of the battery is standardized, the components, raw materials and part of tooling equipment of the alkaline zinc-manganese battery can be adopted, the reliability of the process technology is improved, and the production cost is reduced.

3. The positive electrode is directly contacted with the battery shell through the porous metal band, so that the assembly process is simplified, the electric contact resistance is reduced, and the high-current characteristic is facilitated. The welding electrode on the negative electrode cap is needed to be a drainage body directly inserted into the zinc electrode, and the drainage body is spiral, so that the contact area of the electrified current collector is increased, and the polarization is reduced.

4. The packaging technology of the common zinc-manganese battery is adopted, so that the alkali leakage phenomenon is effectively prevented, and the sealing effect is good.

5. A breathable film is added below the air inlet hole, so that air can uniformly enter the air electrode, and the polarization characteristic of the battery is improved.

The following are the drawings of the utility model:

FIG. 1 is a block diagram of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;

fig. 3 is a structure diagram of the cathode cap and the electrode whisker.

The embodiment of the utility model is as follows:

the air electrode 8 is a round cylinder with one open end, the other end and the non-metal base 5 form a closed end, the high-activation-state microporous electrocatalytic oxidation reduction air electrode is arranged in the battery shell 3,

because the air electrode takes the porous metal band as an outer layer to form an electric path with the battery shell, the battery shell becomes a positive electrode current collector, and electric energy is transmitted outwards through the positive electrode cap 1. The outside air directly reaches the whole surface of the air electrode through the air inlet holes 2 distributed around the anode cap and the ventilation gap provided by the base and the porous metal strips, and enters the electrochemical reaction area of the battery to complete the electrochemical reaction and obtain electric energy. The diaphragm 7 is filled in the air electrode in a cylindrical form and is tightly attached to the inner wall, a true pasty zinc electrode 6 is filled in the diaphragm cylinder, a negative electrode cap 9 is connected with a polar whisker 4, a sealing sleeve 10 is sleeved on the polar whisker, and the polar whisker can be inserted into zinc paste from the open end of the air electrode to form a negative electrode current collector and simultaneously seal the battery.

The air electrode of the battery is formed by superposing a conductive waterproof breathable conductive film, a catalytic film and a porous metal strip. The waterproof and breathable film is made of acetylene black, fluoroplastic emulsion, additives and the like, and the specific film is prepared by fully mixing 13-26% of acetylene black, 67-60% of fluorine emulsion, 20-14% of additives and the like, and then continuously stirring the mixture with ethanol to mix coagulates. The aggregate is fished out and rolled into a film with the thickness of 0.15-0.30 mm in a rolling machine, and the film is dried for standby. The catalytic membrane is prepared by mixing activated carbon (13-26%), manganese dioxide (67-60%) prepared by chemical method, fluorine emulsion (20-14%), adding ethanol, stirring, taking out after black aggregate appears, rolling into 0.05-0.20mm film in a roller press, extracting, and oven drying to obtain the final product. The catalytic membrane, the waterproof and breathable conductive membrane and the porous metal foil are stacked together in order at 250-400Mpa/cm ² Pressing under static pressure to obtain air electrode plate, cutting into 42 × 10mm substrate, assembling with base to obtain circular air electrode 8 with one end closed and the other end open, placing diaphragm sleeve 7 therein, and injecting zinc paste 6. The pasty zinc paste is prepared from metal zinc powder (66-66.5%)9-4% of corrosion inhibitor, 7-1.5% of adhesive and absorbent(1.5-0.5%) and alkaline electrolyte solution (22.5-28.5%) with zinc oxide. The negative pole cap 9 is provided with a sealing sleeve 10 for leading the fluid 4, and after the zinc paste is inserted, the open end of the air electrode is sealed.

Claims

1. A zinc-air battery is characterized in that an air electrode (8) is a round cylinder with an opening at one end, the other end of the air electrode is connected with a non-metal base (5), micropores are formed in the cylinder of the air electrode (8), a porous current collector (12) is covered on the outer surface of the cylinder, a catalytic film is arranged on the inner surface of the cylinder, a cylindrical diaphragm (7) is arranged in the catalytic film, a pasty zinc electrode (6) is filled in the diaphragm (7), a negative electrode cap (9) is connected with an electrode whisker (4), a sealing sleeve (10) is hermetically connected with the opening end of the air electrode cylinder and the electrode cap (9), a battery shell (3) is connected with the sealing sleeve (10) and the base (5), an anode cap (1) and an air inlet (2) are arranged on the shell, and the air inlet is communicated with an air gap formed by the base (5) and the shell.

2. Zinc-air battery according to claim 1, characterized in that the current collector (12) is a porous metal band directly in contact with the metal casing (3), the catalytic membrane, the waterproof breathable conductive membrane air electrode (8), the porous metal band (12) being superimposed in sequence.

3. Zinc-air battery according to claim 1 or 2, characterized in that a gas permeable membrane (11) is present under the gas inlet opening (2) in the air gap formed by the base (5) and the housing.

4. Zinc-air battery according to claim 1 or 2, characterized in that the whiskers (4) are helically fluid-conducting and welded to the cap (9).