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Online detection of stack crossover rate for adaptive hydrogen bleed strategy

A battery stack and fuel cell stack technology, applied in the direction of fuel cells, fuel cell grouping, fuel cell additives, etc., can solve problems such as changes in membrane permeability that are not considered

Inactive Publication Date: 2008-09-10
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] [0008] Known anode offgassing strategies do not take into account changes in membrane permeability over the life of the stack

Method used

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  • Online detection of stack crossover rate for adaptive hydrogen bleed strategy
  • Online detection of stack crossover rate for adaptive hydrogen bleed strategy
  • Online detection of stack crossover rate for adaptive hydrogen bleed strategy

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Embodiment Construction

[0014] [0014] The following discussion of embodiments of the invention is merely exemplary in nature and is not intended to limit the invention or its use or use. The following discussion relates to a method for determining when fuel cell The system provides a method for anode exhaust gas discharge.

[0015] 【0015】 figure 1 is a diagram of a fuel cell 50 comprising an anode side 52, a cathode side 54 and a membrane 56 therebetween. Line 58 represents nitrogen crossover flow from cathode side 54 to anode side 52, line 60 represents flow from anode side 52 during anode exhaust and line 62 represents nitrogen permeation from anode side 52 through pinholes in membrane 56 . Because internal permeation is through pinholes in the membrane, the flow of nitrogen gas from the anode side 52 to the cathode side 54 when the stack 50 is new is very low, so anode exhaust emission models generally do not consider this permeation to determine when to provide Anode exhaust emissions. Becaus...

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Abstract

The invention relates to online detection of stack crossover rate for adaptive hydrogen bleed strategy, in particularly, a system and method for determining when to provide an anode exhaust gas bleed from a fuel cell stack as the fuel cell stack ages. The method determines the amount of nitrogen flowing from a cathode side to an anode side of the fuel cell stack. The method also determines the amount of nitrogen flowing from the anode side to the cathode side by determining a standard deviation of voltage outputs of the fuel cells, and using the standard deviation as a model for determining the leak rate of nitrogen from the anode side to the cathode side. The method determines the concentration of nitrogen in the anode side based on the nitrogen flow between the cathode and anode side, and opens a bleed valve to bleed the anode exhaust gas if the concentration of nitrogen in the anode side goes above a predetermined value.

Description

technical field [0001] [0001] The present invention relates generally to a method of determining when to perform an anode bleed to remove nitrogen from the anode side of a fuel cell stack, and more particularly, to a method of determining when to perform an anode bleed to remove nitrogen from the anode side of a fuel cell stack. A method for lateral nitrogen removal that takes into account the rate of gas leakage through the cell membrane from the anode side to the cathode side due to pinholes in the cell membrane. Background technique [0002] [0002] Hydrogen is a very attractive fuel because it is clean and can be used in fuel cells to efficiently generate electricity. A hydrogen fuel cell is an electrochemical device that includes an anode and a cathode with an electrolyte in between. The anode receives hydrogen and the cathode receives oxygen or air. In the anode hydrogen is dissociated to produce free protons and electrons. The protons travel through the electrolyte ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04G01N11/02H01M8/24
CPCH01M8/04089H01M8/04104H01M8/04231H01M8/04432H01M8/04462H01M8/04761H01M2008/1095H01M2250/20Y02T90/40Y02E60/50
Inventor M·辛哈P·加德D·迪菲奥尔
Owner GM GLOBAL TECH OPERATIONS LLC
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