Method and apparatus for charging and discharging electric...

H - Electricity – 01 – M

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H01M 8/22 (2006.01) H01M 2/40 (2006.01) H01M 12/02 (2006.01) H01M 12/08 (2006.01) H01M 6/50 (2006.01) H01M 10/34 (2006.01)

Patent

CA 2117905

A method and apparatus for storing and producing electrical energy in an electrochemical cell (32), where the cathode is a porous air electrode (7) and the anode is a hydrogen-containing metal hydride (4). According to the invention, an overpressure is allowed to form inside the porous air electrode during charging, the said pressure preventing the formation of hydrogen bubbles on the metal hydride electrode. The overpressure remains at the desired level because the pores of the air electrode are made so small that the surface tension of the electrolytic solution (6) penetrating into the pores seals the porous air electrode.

Méthode et appareil pour le stockage et la production d'énergie électrique dans une cellule électrochimique (32), dans laquelle la cathode est une électrode oxydoréductrice poreuse (7) et l'anode, une électrode à hydrure métallique contenant de l'hydrogène (4). Selon l'invention, une surpression se crée à l'intérieur de l'électrode oxydoréductrice poreuse pendant le chargement, cette pression prévenant la formation de bulles d'hydrogène sur l'électrode d'hydrure métallique. La surpression demeure au niveau désiré parce que les pores de l'électrode oxydoréductrice sont si petits que la tension superficielle de la solution électrolytique (6) pénétrant dans les pores scelle l'électrode oxydoréductrice poreuse.

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