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Method for fast online recovery of reversible voltage drop of fuel cell stack

A fuel cell stack and voltage drop technology, applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of reducing the service life of the stack, affecting the performance and normal operation of the stack, and improving the performance and reducing the recovery oxidant. Supply, Guaranteed Integrity Effect

Inactive Publication Date: 2019-05-17
WUHAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the bottleneck of the commercial use of fuel cell stacks, the durability of the stack is the breakthrough that needs to be opened urgently. However, during the operation of the stack, the voltage will drop due to different reasons, which will affect the performance and normal operation of the stack. operation, which will greatly reduce the service life of the stack

Method used

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  • Method for fast online recovery of reversible voltage drop of fuel cell stack
  • Method for fast online recovery of reversible voltage drop of fuel cell stack
  • Method for fast online recovery of reversible voltage drop of fuel cell stack

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Assembly circuit diagram: as figure 1 As shown, connect the auxiliary parts in normal operation and the stack that meet the standard according to the assembly drawing, and fill the flow channel with 20kPa of N2 to detect whether there is air leakage in the connected line. If there is air leakage, it is necessary to detect the leakage point and fix it Solved, if there is no air leakage, proceed to the next step.

[0025] Strategy loading: Turn on the constant temperature water circulation system of the system to keep the stack at a constant temperature of 60°C. Before filling the stack with hydrogen, it is necessary to use nitrogen to purge the hydrogen flow channel to remove impurities in the hydrogen flow channel. Switch after a certain period of time. Hydrogen supply The fuel cell generates electricity normally, and increases the current at a certain speed. Before loading, the gas supply under the next load of the stack needs to be given to ensure sufficient fuel supp...

Embodiment 2

[0030] Assembly circuit diagram: Connect the auxiliary parts in normal operation and the standard stack according to the assembly diagram, and fill the flow channel with 20kPa of N2 to detect whether there is air leakage in the connected line. If there is air leakage, it is necessary to detect the air leakage point and Solve it, and proceed to the next step if there is no air leakage.

[0031] Strategy loading: Turn on the constant temperature water circulation system of the system to keep the stack at a constant temperature of 60°C. Before filling the stack with hydrogen, it is necessary to use nitrogen to purge the hydrogen flow channel to remove impurities in the hydrogen flow channel. Switch after a certain period of time. Hydrogen supply The fuel cell generates electricity normally, and increases the current at a certain speed. Before loading, the gas supply under the next load of the stack needs to be given to ensure sufficient fuel supply. When the load reaches 100A, sto...

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Abstract

The invention provides a method for fast online recovery of reversible voltage drop of a fuel cell stack. According to the method for fast online recovery of the reversible voltage drop of the fuel cell stack, the fuel cell stack instantaneously reduce the supply of an oxidant in the process of operation of high current and high back pressure, so that reduction of oxide in a catalyst is rapidly carried out by the fuel cell stack, and then the supply of the oxidant is restored to restore the performance of the fuel cell stack; and meanwhile, the anode pressure is stabilized by using a proportional adjustment method to avoid irreversible loss of the fuel cell stack caused by the excessive pressure difference. By adopting the method for fast online recovery of the reversible voltage drop of the fuel cell stack, the fuel cell stack can quickly recover the reversible voltage drop on line without downtime, and therefore long time continuous high-efficiency operation of the fuel cell stack isrealized.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a fast on-line recovery method for reversible voltage drop of a fuel cell stack. Background technique [0002] The fuel cell stack is the core part of the fuel cell power system. It is a large energy conversion component that can convert chemical energy into electrical energy, and can provide high power for the use of electrical equipment. As the bottleneck of the commercial use of fuel cell stacks, the durability of the stack is the breakthrough that needs to be opened urgently. However, during the operation of the stack, the voltage will drop due to different reasons, which will affect the performance and normality of the stack. operation, which will greatly reduce the service life of the stack. [0003] There are different types of voltage drop for different reasons. Voltage drop is usually classified as reversible or irreversible. Both voltage drops can cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04858H01M8/04746
CPCY02E60/50
Inventor 郭伟洪丰潘牧肖宽张泽远杨云
Owner WUHAN UNIV OF TECH
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