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....http://www.google.de/patents/US5904998?utm_source=gb-gplus-sharePatent US5904998 - Metal-air cathode can and electrochemical cell made therewith
