Air cell

Details Air cell Air cell

1991-02-12

1995-12-19

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 34, 429 14, H01M 1206

Patent

active

054767300

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to an air cell.
In order to drive a motor mounted on a model airplane, one or more cells to be mounted must be compact and light. Therefore, nickel-cadmium cells are generally used.
For instance, seven U No. 3 cells (about 170 g) mounted on a model helicopter can provide a flight time on the order of two minutes.
In order for such model airplanes to be put to such uses as cropdusting, surveying and photographing, there is a demand for lengthening the flight time. However, because the conventional cells have a small output per unit weight and many cells cannot be mounted on a model airplane, a sufficiently long flight time is difficult to achieve.
The conventional cells have a further problem not only in connection with model helicopters as mentioned above but also with driving power supplies which must supply high power, in that such cells cannot meet the demands for higher power per unit weight and a long service life.


SUMMARY OF THE INVENTION

An object of the present invention is to provide an air cell which is compact and light and yet is capable of supplying a high power output.
The air cell in accordance with the present invention is characterized in that a current collector is disposed between a cathode and an anode and contacts the cathode.
According to another aspect of the present invention, the cathode has a plurality of spaced-apart sections or at least one through-hole extending therethrough.
As described above, the current collector is disposed between the cathode and the anode and contacts the cathode. Accordingly, the air cell can be compact and lightweight, has a low degree of internal resistance, and advantageously generates high current.
Further, because the cathode has a plurality of spaced-apart sections or at least one through-hole extending therethrough, the air cell can be compact and light and yet is capable of producing a high output.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a longitudinal sectional view of a first embodiment of the present invention;
FIG. 1B is an exploded view illustrating the component parts thereof;
FIG. 2 is a graph indicating the relationship between cathode area and output density;
FIG. 3 illustrates the steps for the fabrication of a cathode 20 in the first embodiment;
FIG. 4 is a graph indicating the relationship between the quantity of active carbon contained in a petroleum-series graphite powder and the output density;
FIG. 5A is a longitudinal sectional view of a second embodiment of the present invention;
FIG. 5B is an exploded view illustrating the component parts thereof;
FIG. 6 is a graph showing discharge curves; and
FIG. 7 is a sectional elevation view of a third embodiment of the invention .


BEST MODE FOR CARRYING OUT THE INVENTION

The air cell 1 of the first embodiment of the present invention has a porous glass sheet 10, a cathode 20, a current collector 30, a separator 40, an anode 50 and a liquid storage reservoir 60 storing therein liquid KCl 61.
The porous glass sheet 10 is a mounting plate for supporting the cathode 20 and is water repellent.
The cathode 20 is a film mainly consisting of petroleum graphite powder.
As shown in FIG. 1B, the cathode 20 is in intimate contact with the surface of the porous glass sheet 10 facing toward anode 50 and is divided into a plurality of sections.
The current collector 30 is in the form of a wire net or a screen which is fabricated from a metal such as nickel, copper or the like and has a mesh of from 200 to 300, so that moisture may pass through the current collector 30. It is disposed between the cathode 20 and the anode 50 and is in intimate contact with the cathode 20.
The separator 40 is made of a water absorbing material such as glass fiber sheet which has not been subjected to a water repellent treatment. It electrically isolates the current collector 30 from the anode 50 and absorbs liquid KCl or NaCl (electrolyte) 61 by a capillary phenomenon, so that the cathode 20 and the anode 50 are wetted. Instead of a glass fiber shee

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