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Fuel cell coolant flowfield configuration

A fuel cell and coolant technology, applied in fuel cell additives, fuel cells, fuel cell grouping, etc., which can solve the problems of CSA durability limitation, membrane wear, performance decay, etc.

Active Publication Date: 2015-07-01
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] CSA durability may be limited by multiple decay mechanisms or factors
For example, voltage cycling can cause performance to decay over time
Membrane abrasion may be caused by localized membrane humidity cycles
Both types of cycling may occur in response to changes in load or power demand

Method used

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  • Fuel cell coolant flowfield configuration
  • Fuel cell coolant flowfield configuration
  • Fuel cell coolant flowfield configuration

Examples

Experimental program
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Embodiment Construction

[0012] figure 1 A schematic diagram showing selected components of an example fuel cell assembly 20, including: a first electrode 22, such as a cathode; a second electrode 24, such as an anode; and, a membrane 26 positioned between the first electrode 22 and the second electrode 24 . The first gas diffusion layer 28 is positioned adjacent to the first electrode 22 and the second gas diffusion layer 30 is positioned adjacent to the second electrode 24 . The first gas diffusion layer 28 and the second gas diffusion layer 30 are positioned on opposite sides of the first electrode 22 and the second electrode 24 from the membrane 26, respectively.

[0013] The example first fluid distribution plate assembly 32 includes a first reactant flow channel 34 on a first side 36 of the first fluid distribution plate assembly 32 and a coolant flow channel on a second, opposite side 40 of the first fluid distribution plate assembly 32 . Supply channel 38. The first reactant flow channel 34...

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Abstract

An exemplary method of cooling a fuel cell includes directing coolant through a coolant supply channel near at least one reactant flow channel. The coolant supply channel extends from a coolant inlet spaced from a reactant inlet to a coolant outlet. The coolant supply channel includes a first portion starting at the coolant inlet and a second portion near the reactant inlet. The first portion facilitates coolant flow from the coolant inlet directly toward the second portion. The second portion includes a plurality of channel sections that collectively facilitate coolant flow in a plurality of directions along the second portion near the reactant inlet. The coolant supply channel includes a third portion between the second portion and the coolant outlet.

Description

Background technique [0001] A typical fuel cell arrangement includes multiple fuel cells placed together in a cell stack assembly (CSA). Each fuel cell generally includes an anode, a cathode, and a membrane between the anode and cathode. A cathode reactant, such as oxygen, and an anode reactant, such as hydrogen, are used in an electrochemical reaction at the membrane to generate electrical energy. [0002] CSA durability may be limited by multiple decay mechanisms or factors. For example, voltage cycling may cause performance to decay over time. Membrane abrasion may be caused by localized membrane humidity cycling. Both types of cycling may occur in response to changes in load or power demand. Another source of CSA decay is high operating temperature. Higher operating temperatures tend to correlate with higher decay rates in CSA performance. Various approaches have been taken to slow down the decay of CSAs caused by high operating temperatures. Contents of the invent...

Claims

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Application Information

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IPC IPC(8): H01M8/24H01M8/04H01M8/02
CPCY02E60/50H01M2008/1095H01M8/0263H01M8/0267H01M8/04134H01M8/04067H01M8/2465H01M8/04074
Inventor J.D.奥奈尔S.S.巴达格
Owner AUDI AG
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