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Modified startup strategy to improve startup reliability after extended off time

A reliable, fuel cell stack technology for electric vehicles, electrochemical generators, transportation and packaging, which can solve problems such as startup failures

Inactive Publication Date: 2012-05-02
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, system start-up failures often occur after the fuel cell system has been shut down for a significant period of time due to the lack of capability of one or more cells within the fuel cell stack to deliver the required amount of current

Method used

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  • Modified startup strategy to improve startup reliability after extended off time
  • Modified startup strategy to improve startup reliability after extended off time
  • Modified startup strategy to improve startup reliability after extended off time

Examples

Experimental program
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Embodiment Construction

[0013] The following description of an embodiment of the invention of the process of altering the start-up procedure of a fuel cell system in order to increase system start-up reliability in response to a determination that a membrane in a fuel cell stack may be too dry and have too high a resistance is merely exemplary in nature, It is not meant to limit the invention or its application or uses.

[0014] figure 1 is a schematic configuration diagram of a fuel cell system 10 including a fuel cell stack 12 . The system 10 also includes a compressor 14 driven by a motor 16 that provides cathode input air on a cathode input line 18 to the stack 12 . The cathode exhaust gas is output on the cathode exhaust gas line 20 . A water vapor transport (WVT) unit 22 is provided in the cathode input line 18 to humidify the cathode air flow in a manner known to those skilled in the art. Although not explicitly stated, moisture for the WVT unit 22 is typically provided by the cathode exhau...

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PUM

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Abstract

A system and method for improving fuel cell system start-up reliability. The method includes determining if the resistance of the membranes in a fuel cell stack is too high, where the reliability of system start-up will be reduced, and if so, providing one or more remedial actions to help ensure that the start-up is more reliable. In one embodiment, the system and method determine that the fuel cell membranes are too dry based on the time that has gone by since the last shut-down. If the time threshold has been exceeded, a special start-up procedure is used that increases the reliability thatthe start-up will be successful using the remedial actions, such as reducing cathode airflow and turning on stack end cell heaters.

Description

technical field [0001] The present invention relates generally to a system and method for improving the start-up reliability of a fuel cell system, and more particularly to a system and method for improving the start-up reliability of a fuel cell system after the system has been shut down for a substantial period of time , the systems and methods reduce cathode air compressor flow and / or provide stack load for stack current flow, thereby reducing membrane drying and / or increasing membrane humidity. Background technique [0002] Hydrogen is a very attractive fuel because it is clean and efficiently generates electricity in fuel cells. A hydrogen fuel cell is an electrochemical device that includes an anode, a cathode, and an electrolyte therebetween. The anode receives hydrogen and the cathode receives oxygen or air. In the anode hydrogen is decomposed to generate free protons and electrons. Protons travel through the electrolyte to the cathode. The protons react with oxy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H02J7/00H01M8/24
CPCH01M8/04223H01M8/04828Y02E60/50H01M8/04492H01M8/04141H01M8/04303H01M8/04302H01M8/04225H01M8/04228
Inventor A·乔扈里
Owner GM GLOBAL TECH OPERATIONS LLC
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