Patent ID: 6383674
Filing Date: 2002-05-07
Classification: H01M

Abstract:
An electrochemical cell comprising:a cell housing having a first end including at least one air opening to allow air to enter into a first portion of said cell housing from the surrounding environment; a first positive electrode provided in said first portion of said cell housing and exposed to the air entering said cell housing through said air opening; a second positive electrode disposed in a second portion of said cell housing; a membrane disposed in said cell housing across said first end between said first and second positive electrodes so as to divide the inside of said cell housing into said first and second portions, said membrane being formed of a material capable of absorbing hydroxyl ions and water while restricting oxygen transmission, so as to allow ion and water transport between said first and second positive electrodes and substantially prevent the air entering said first portion of said cell housing from reaching said second portion of said cell housing; a negative electrode disposed in said second portion of said cell housing; and an electrolyte disposed in said second portion of said cell housing.