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Fuel cell activation method and method for preventing /improving membrane dryness

A fuel cell and activation method technology, which is applied in the field of MEA dry film, can solve the problems of dry film and reduce the operating efficiency of the stack, and achieve the effects of simple operation, performance recovery, and shortened activation time

Active Publication Date: 2019-12-13
WUHAN GROVE HYDROGEN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] If the water is not properly managed during the operation of the stack, it will easily cause dry film, which will lead to the interruption of the operation of the stack and greatly reduce the operating efficiency of the stack.

Method used

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  • Fuel cell activation method and method for preventing /improving membrane dryness
  • Fuel cell activation method and method for preventing /improving membrane dryness
  • Fuel cell activation method and method for preventing /improving membrane dryness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The hydrogen fuel cell stack was activated according to the conditions in Table 1 below.

[0091] Table 1: Stack activation conditions

[0092]

[0093] First, humidified hydrogen is provided to the anode of the stack and humidified air is provided to the cathode. Set the hydrogen metering ratio to 3 and the air metering ratio to 5. Set the first dew point temperature of air and hydrogen to 60°C, and the temperature of the cooling water for battery operation to 55°C. Keep the battery current stable at about 0.1A / cm 2 At low current density. Run for 30-60min under this condition.

[0094] At the same time, a high-frequency impedance meter is used for online measurement of the fuel cell stack.

[0095] When the measured value of resistance tends to no longer change, it is converted to 2A / cm 2 At the same time, adjust the dew point temperature of air and hydrogen to 45℃, and the cooling water temperature of the battery is 70℃. Continue to operate under high current density unt...

Embodiment 2

[0102] In the self-humidifying fuel cell stack, the current density is 2A / cm 2 , The cooling water temperature is 70-85 ℃ under the condition of normal operation. At this time, the dew point temperature of hydrogen is set at 45-55°C, the metering ratio of hydrogen is 1.25-1.3, and the metering ratio of air is 1.5-2. During the monitoring, the high-frequency resistance value is about 300mΩcm2 and the voltage is 0.6V.

[0103] When the resistance value is found to continue to rise> 350mΩcm2, while the voltage continues to drop 2 , And then adjust the stack temperature so that the cooling water temperature is 55°C and the hydrogen dew point is 60°C. And adjust the metering ratio of hydrogen to 2.2, and the metering ratio of air to 2.0.

[0104] Observe that the resistance value begins to decrease, and the voltage begins to increase. Run for 30-60 minutes under this low current density condition until the voltage returns to 0.845V and the voltage fluctuation range is less than 5mV.

...

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Abstract

The invention relates to a fuel cell activation method and a method for preventing / improving membrane dryness. The fuel cell activation method comprises the following steps that: cooling water, hydrogen and oxygen-containing gas are introduced into a cell stack, and the first temperature of the cooling water, the first dew point temperature of the oxygen-containing gas and the first dew point temperature of the hydrogen are set; the cell stack is made to operate at a low current density, and the high-frequency resistance of the fuel cell stack, and the average voltage or output power of unitcells of the fuel cell stack are monitored; the second temperature of the cooling water, the second dew-point temperature of the oxygen-containing gas and the second dew-point temperature of the hydrogen are set when the high-frequency resistance is reduced from a high resistance value to a low resistance value or when the average voltage of the unit cells or a voltage obtained by the output powertends to be stable; and current is gradually increased to 2A / cm <2>, and the cell stack is made to operate under the current density until the average voltage change of the unit cells is less than 5mV, the first dew point temperature of the oxygen-containing gas and the first dew point temperature of the hydrogen gas are set to be higher than the first temperature of the cooling water by 5 DEG Cto 10 DEG C.

Description

Technical field [0001] The present invention relates to fuel cells, in particular to the activation of fuel cell stacks and methods for preventing or improving MEA dry film during stack operation. Background technique [0002] Fuel cells have the advantages of high energy conversion rate and environmental friendliness, while Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of low temperature operation and high specific power, and is a new type of power source with wide application prospects. The anode and cathode of a fuel cell using hydrogen as a fuel react as shown in the following equations. [0003] H 2 -2e - →2H + Anode reaction [0004] 1 / 2O 2 +2H + +2e - →H 2 O cathode reaction [0005] Among them, the hydrogen used as fuel at the anode is oxidized to hydrogen ions (protons), and transferred to the cathode through a proton exchange membrane, where it reacts with oxygen used as an oxidant to produce water. [0006] Membrane Electrode Assembly (MEA) is the core compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/008H01M8/04119H01M8/04291H01M8/04537H01M8/04701H01M8/04828H01M8/2457
CPCH01M8/008H01M8/04126H01M8/04291H01M8/04552H01M8/04649H01M8/04701H01M8/04708H01M8/04835H01M8/0485H01M8/2457Y02E60/50Y02W30/84
Inventor 李祥帆郝义国刘超
Owner WUHAN GROVE HYDROGEN AUTOMOBILE CO LTD
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