Process for adding electrolyte to a fuel cell stack

Details Process for adding electrolyte to a fuel cell stack Process for adding electrolyte to a fuel cell stack

H - Electricity

01

M

319/10

H01M 8/04 (2006.01) H01M 2/36 (2006.01)

Patent

CA 1246139

Process for Adding Electrolyte to a Fuel Cell Stack Abstract Electrolyte is replenished in a fully assembled stack of fuel cells by depositing dilute electrolyte of known concentration on an external vertical face of the stack. The electrolyte is absorbed into the cell components through their edges by capillary action. Electrolyte is continuously deposited on the stack surface until the electrodes and matrix layers of the stack are fully saturated. Thereafter the stack is heated and water is evaporated until the stack has a desired operable electrolyte volume and electrolyte concentration therein. By knowing the total volume of electrolyte in the stack when the stack is fully saturated, and by knowing the concentration of the electrolyte in the fully saturated stack, the conditions under which water is thereafter evaporated may be controlled to result in the desired electrolyte volume and electrolyte concentration within the stack.

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