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Method for testing defects of single membrane electrode assembly in fuel cell stack

A fuel cell stack and membrane electrode group technology, applied in the direction of material resistance, etc., can solve the problems of fuel cell stack operation impact and difficult detection

Active Publication Date: 2009-10-28
HANERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, defective monolithic membrane electrodes in the fuel cell stack have a great impact on the operation of the fuel cell stack, and its detection is also a big problem

Method used

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  • Method for testing defects of single membrane electrode assembly in fuel cell stack
  • Method for testing defects of single membrane electrode assembly in fuel cell stack
  • Method for testing defects of single membrane electrode assembly in fuel cell stack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Connect the two electrodes of the constant current source to the positive and negative poles of the fuel cell stack, and fix the single-chip acquisition fixture of the voltage detection system on the fuel cell stack. The temperature of the fuel cell stack is controlled at 60°C. Inject saturated and humidified hydrogen gas at a flow rate of 0.1L / min, adjust the current of the constant current source to 1A after 10 minutes, and collect the voltage values ​​of 28 membrane electrode groups after 4 minutes, respectively in V 1 , V 2 、···V 28 , and the results are shown in Table 1.

[0020] Table 1 Voltage values ​​of each membrane electrode group (in mV)

[0021] V 1

V 2

V 3

V 4

V 5

V 6

V 7

V 8

V 9

V 10

V 11

V 12

V 13

V 14

5

5.1

5.1

5.2

5.1

4.9

5.1

5.0

5.0

5.0

5.8

5.2

5.2

5.1

V...

Embodiment 2

[0028] Connect the two electrodes of the constant current source to the positive and negative poles of the fuel cell stack, and fix the single-chip acquisition fixture of the voltage detection system on the fuel cell stack. The temperature of the fuel cell stack is controlled at 65°C. On both sides of the fuel cell MEA Inject saturated and humidified hydrogen gas at a flow rate of 10 L / min, adjust the current of the constant current source to 10 A after 20 minutes, and collect the voltage values ​​of 28 membrane electrode groups after 10 minutes, respectively expressed as V 1 -V 28 , and the results are shown in Table 2.

[0029] Table 2 Voltage values ​​of each membrane electrode group (in mV)

[0030] V 1

V 2

V 3

V 4

V 5

V 6

V 7

V 8

V 9

V 10

V 11

V 12

V 13

V 14

50

51

51

52

51

49

51

50

50

50

58

52

52

51

V 15...

Embodiment 3

[0036] Connect the two electrodes of the constant current source to the positive and negative poles of the fuel cell stack, and fix the monolithic acquisition fixture of the voltage detection system on the fuel cell stack. The temperature of the fuel cell stack is controlled at 75°C. Inject saturated and humidified hydrogen gas at a flow rate of 5L / min, adjust the current of the constant current source to 5A after 15 minutes, and collect the voltage values ​​of 28 membrane electrode groups after 8 minutes, respectively in V 1-V 28 , and the results are shown in Table 3.

[0037] Table 3 Voltage values ​​of each membrane electrode group (in mV)

[0038] V 1

V 2

V 3

V 4

V 5

V 6

V 7

V 8

V 9

V 10

V 11

V 12

V 13

V 14

25

25.5

25.6

26

25.5

24.8

25.6

25.1

25

25.1

29.1

26

26

25.5

V 15

...

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Abstract

The invention discloses a method for testing defects of a single membrane electrode assembly in a fuel cell stack, which comprises that: two electrodes of a constant current source are connected with an anode and a cathode of the fuel cell stack; a single acquisition fixture of a voltage detecting system is fixed on the fuel cell stack; the temperature of the fuel cell stack is controlled to be between 60 and 75 DEG C; two sides of an MEA of a fuel cell are introduced with saturated humidifying hydrogen at a flow rate of between 0.1 and 10 L / min, the current of the constant current source is adjusted to be between 1 and 10A after 10 to 20 minutes, and voltage data of each membrane electrode assembly is acquired after 4 to 10 minutes to calculate a voltage average; and the defective membrane electrode assembly is determined by comparing the voltage data of the single membrane electrode assembly and the voltage average. The method has the advantages of simple and easy implementation and accurate test result, and belongs to the field of fuel cell internal resistance test.

Description

technical field [0001] The invention relates to a method for inspecting a defect of a cell stack, in particular to a method for inspecting a defect of a monolithic membrane electrode group in a fuel cell stack. Background technique [0002] A fuel cell is a device that converts chemical energy into electrical energy through a fuel combustion reaction in the battery. The negative electrode serves as the common interface between the fuel and the electrolyte, and catalyzes the oxidation reaction of the fuel; while the positive electrode serves as the common interface between oxygen and the electrolyte, and Catalyzes the reduction reaction of oxygen. Fuel cells are divided into phosphoric acid type (PAFC, phosphate fuel cell), molten carbonate type (MCFC, melt carbonate fuel cell), solid oxide type (SOFC, solidoxide fuel cell) and proton exchange membrane type (PEMFC, proton exchange membrane fuel cell). Among them, the proton exchange membrane fuel cell (PEMFC) can work in a ...

Claims

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Application Information

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IPC IPC(8): G01N27/20
Inventor 孙永欣肖钢
Owner HANERGY TECH
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