Metal-air cathode can, and electrochemical cell made therewith

Details Metal-air cathode can, and electrochemical cell made therewith Metal-air cathode can, and electrochemical cell made therewith

1995-09-19

1998-08-18

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 86, 429 87, 429164, H01M 212, H01M 1206

Patent

active

057956677

ABSTRACT:
This invention pertains to metal-air electrochemical cells wherein one or more air entry ports is located in the bottom of the cathode can, to provide for entry of oxygen-rich air into the cathode can, where the oxygen participates in the chemical reaction whereby the cell produces electrical energy. In this invention, multiple small air entry ports are provided. Generally, the use of multiple ports distributed over the bottom of the cathode can, opposite the reaction surface of the cathode assembly, while not increasing the overall open area of the ports, results in an increase in the ratio of the cell limiting current to the rate at which moisture is lost from the cell. Accordingly, moisture loss as a function of electrical energy produced, is reduced. Preferred embodiments of the air entry ports have a stepped cross-sectional opening that provides a larger diffusion area controlling diffusion of air into and out of the cell through a covering tab prior to the cell being put into use, and a smaller untabbed diffusion area controlling diffusion of air into and out of the cell when the cell is in use.

REFERENCES:
patent: 4118544 (1978-10-01), Przybyla et al.
patent: 4649090 (1987-03-01), Oltman et al.
patent: 4687714 (1987-08-01), Oltman et al.
patent: 5191274 (1993-03-01), Lloyd et al.
patent: 5279905 (1994-01-01), Mansfield et al.
patent: 5306578 (1994-04-01), Ohashi et al.

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