Fuel cell flow-field structure formed by layer deposition

Details Fuel cell flow-field structure formed by layer deposition Fuel cell flow-field structure formed by layer deposition

H - Electricity

01

M

H01M 8/02 (2006.01) H01M 8/22 (2006.01)

Patent

CA 2329729

A flow-field structure (20, 30, 40, 50, 60, 70) for an electrochemical fuel cell plate is manufactured by sequentially depositing layers of a suspension of formable initially liquid material, typically conductive material, such as screen printing ink in which fine graphite particles are suspended, onto a substrate (22, 32, 41) in conformity with a flow-field wall pattern formed in a screen stencil (116) through the porous mesh of which the suspension is passed. The deposited material bonds with the substrate to form flow-channel boundary walls (24, 34, 44) in a three-dimensional pattern conforming to the stencil pattern. Fuel cell plates with complex flow field topographies may be manufactured using this method. Hydrogen can be used as a fuel gas in fuel cells comprising such plates.

L'invention concerne une structure (20, 30, 40, 50, 60, 70) de champ d'écoulement utile pour une plaque de pile à combustible électrochimique, qu'on fabrique en déposant de manière séquentielle des couches d'une suspension constituée d'une matière initialement liquide pouvant être mise en forme, généralement une matière conductrice telle que de l'encre pour sérigraphie dans laquelle sont suspendues de fines particules de graphite, sur un substrat (22, 32, 41) conformément à un motif de parois de champ d'écoulement formé dans un pochoir (116) à trame, à travers les mailles poreuses duquel on fait passer la suspension. La matière déposée se lie au substrat pour former des parois (24, 34, 44) limitant le champ d'écoulement selon un motif en trois dimensions conforme au motif du pochoir. Des plaques de pile à combustible à topographie complexe de champ d'écoulement peuvent être fabriquées à l'aide de ce procédé. On peut utiliser de l'hydrogène comme gaz combustible dans les piles à combustible comportant ces plaques.

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