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Flow field design for high fuel utilization fuel cells

A fuel cell and flow field technology, applied to fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of electrode reaction rate reduction, uneven current density, etc.

Inactive Publication Date: 2006-05-10
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reduction in partial pressure can be drastic, causing a drop in the Nernst potential across the cell, whereby the electrode reaction rate is significantly reduced along the direction of flow, resulting in a non-uniform current density through the fuel cell

Method used

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  • Flow field design for high fuel utilization fuel cells
  • Flow field design for high fuel utilization fuel cells
  • Flow field design for high fuel utilization fuel cells

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Embodiment Construction

[0031] A schematic diagram of a typical SOFC stack is shown in FIG. 1 . However, for simplicity, only one battery cell in the battery stack is shown in FIG. 1 . Battery cell 10 comprises an electrolyte-electrode assembly comprising a solid oxide electrolyte 12 sandwiched between a cathode 14 and an anode 16 . During operation, oxidant (typically air) and fuel (typically hydrogen) are supplied to flow field plates 18, 20 at inlets 22, 24, respectively. Oxidant and fuel streams exit the stack 10 at outlets 26 , 28 . During operation, power is delivered to a load represented by resistor 30 .

[0032] Flow fields are incorporated in the distribution or flow channels 32, 34 formed in the flow field plates 18, 20 for direct delivery of reactants in the outflow direction to the surfaces of the cathode and anode.

[0033] see figure 2 , which schematically shows the flow field design of the fuel cell flow channel 36 formed in the flow field plate 18 or 20 . The flow field 38 incl...

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Abstract

A flow field (38) forming a wall of a channel (36) in a flow field plate (18) of a solid oxide fuel cell (10), the flow field comprising a flow field having a different shape protruding from the substrate into the channel A flat substrate (40) forming a patterned array of barriers (52, 64, 66), the cross-sectional area of ​​the flow field channels decreases in the direction of flow.

Description

technical field [0001] The present invention relates to high performance fuel cells and, more particularly, to optimized flow field and channel designs for promoting consistent performance and increasing the efficiency of fuel cell systems. Background technique [0002] A fuel cell converts reactants, namely fuel and oxidant, into electricity and reaction products. Fuel cells typically use an electrolyte disposed between two electrodes, a cathode and an anode. Preferred types of fuel cells include solid oxide fuel cells (SOFCs), which include a solid oxide electrolyte and operate at relatively high temperatures. Generally, solid oxide fuel cells use oxygen-ion conductors (such as stabilized zirconia, doped ceria, doped lanthanum gallate) or proton conductors (such as doped perovskite Ba(Sr) CeO 3 , Ba(Sr)ZrO 3 , and the hybrid perovskite A 3 (B'B")O 9 ) as the electrolyte. Currently, solid oxide fuel cells almost exclusively use oxygen-ion-conducting yttria-stabilized...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86
CPCH01M8/0258H01M8/0265H01M2008/1293Y02E60/50H01M8/2483H01M8/0263H01M8/02
Inventor F·伊萨茨J·关E·T·翁
Owner GENERAL ELECTRIC CO
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