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GB/T 20042.6-2011 English PDF (GBT20042.6-2011)

GB/T 20042.6-2011 English PDF (GBT20042.6-2011)

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GB/T 20042.6-2011: Proton exchange membrane fuel cell -- Part 6: Test method of bipolar plate properties

This part of GB/T 20046 specifies the terms and definitions, the gas tightness test for bipolar plate materials, bending strength test, density test, resistance test and corrosion current density test, etc.; the bipolar plate parts gas tightness test, resistance drop test, area utilization test, thickness uniformity test, flatness test, weight test and resistance test for the characteristic test method for the proton exchange membrane fuel cell bipolar plates.
GB/T 20042.6-2011
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.070
K 82
Proton exchange membrane fuel cell ?€?
Part 6. Test method for bipolar plate properties
ISSUED ON. DECEMBER 30, 2011
IMPLEMENTED ON. MAY 01, 2012
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword . 3
1 Scope .. 4
2 Normative references . 4
3 Terms and definitions . 4
4 Bipolar plate material gas tightness test . 6
5 Bipolar plate material bending strength test . 8
6 Bipolar plate material density test . 10
7 Bipolar plate material resistance test . 11
8 Bipolar plate material corrosion current density test . 14
9 Bipolar plate component gas tightness test . 16
10 Bipolar plate component resistance drop test . 17
11 Bipolar board component area utilization test . 19
12 Bipolar plate part thickness uniformity test .. 20
13 Bipolar plate component flatness test . 22
14 Bipolar plate component weight test . 23
15 Bipolar plate component resistance test . 24
16 Test preparation and test report .. 26
Appendix A (Informative) Test preparation . 27
Appendix B (Informative) Test report .. 28
Proton exchange membrane fuel cell ?€?
Part 6. Test method for bipolar plate properties
1 Scope
This part of GB/T 20046 specifies the terms and definitions, the gas tightness test for bipolar plate materials, bending strength test, density test, resistance test and corrosion current density test, etc.; the bipolar plate parts gas tightness test, resistance drop test, area utilization test, thickness uniformity test, flatness test, weight test and resistance test for the characteristic test method for the proton exchange membrane fuel cell bipolar plates.
This part applies to various types of bipolar plate materials and components for proton exchange membrane fuel cells. This standard is mainly divided into two parts. bipolar plate material characteristics test and bipolar plate component characteristics test.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB/T 7962.20-1987 Colorless optical glass test methods - Density
GB/T 13465.2-2002 Test method for flexure strength of impermeable
graphite materials
GB/T 19922-2005 Standard test methods for measuring site flatness on
silicon wafers by noncontact scanning
GB/T 20042.1 Proton exchange membrane fuel cell - Terminology
JJG 508-2004 Verification regulation of resistivity measuring instruments with four-probe array method
3 Terms and definitions
The terms and definitions defined in GB/T 19596 and GB/T 20042.1 and the following terms and definitions apply to this part.
Note. The flatness of the bipolar plate directly affects the contact resistance between the bipolar plate and the carbon paper, thereby affecting the battery performance.
3.7
Resistance drop
The pressure difference of the gas which flows through the inlet and outlet of the bipolar plate.
3.8
Area utilization
The effective area ratio of the bipolar plate, i.e., the ratio of the effective area of the bipolar plate (area of the flow-field) to the total area of the bipolar plate. 4 Bipolar plate material gas tightness test
4.1 Test instruments and equipment
Test instruments and equipment include.
- Gas chromatograph.
- Infiltration pool.
4.2 Sample preparation
4.2.1 The shape of the sample is a square (5 cm x 5 cm), the area is 25 cm2; the shape and size of the sample can also be determined through negotiation between the two parties.
4.2.2 The number of samples is 5 (guaranteed to obtain 3 valid values), there shall be no wrinkles, scratches and damage.
4.2.3 For different batches of bipolar plate materials, they shall be sampled separately; single materials shall be randomly sampled, different materials shall be separately sampled.
4.3 Test methods
4.3.1 SANDWICH the sample in between two stainless steel clamps, each
having a gas inlet and outlet, SEAL it to form a gas chamber on both sides, as a test infiltration cell.
4.3.2 INSTALL the infiltration cell on the test device in accordance with the 2 - Infiltration cell;
3 - Oxygen/hydrogen;
4 - Clamps;
5 - Sample;
6 - Clamps;
7 - Gas chromatography.
Note. The infiltration cell consists of two stainless steel plate clamps with gas inlet and outlet. The sample is placed between the two clamps. A line seal is used between the fixture and the sample to form a gas chamber on both sides. Oxygen/hydrogen gas and inert gas flow into the infiltration cell at both sides of the sample, so that a constant pressure difference can be maintained on both sides of the bipolar plate. The pressure on both sides is controlled mainly by precision pressure gauges. The driving force of the measured gas penetration is the gas concentration difference on both sides of the sample, so that the inert gas flowing from the infiltration cell contains the measured gas permeating from the other side of the bipolar plate; the gas chromatograph is used to detect the concentration of the gas to be
measured at the outlet of the infiltration cell.
Figure 1 -- Schematic diagram of testing device for bipolar plate air
permeability test
4.4.2 TEST the air permeability at different pressure differences (??P), DRAW the relationship curve between ??P and air permeability.
TAKE 3 valid samples as a group, CALCULATE the average value as the test result.
5 Bipolar plate material bending strength test
5.1 Test instruments
5.1.1 Test machine
Any test machine that meets the test requirements of this standard can be used. 5.1.2 Test clamps
The test clamps shall not cause the specimen to break at the fixture. When the load is applied, the longitudinal axis of the specimen shall be matched with the direction of tensioning through the center line of the clamp.
L - Support span, in millimeters (mm);
b - Width of the specimen, in millimeters (mm);
h - Thickness of the specimen, in millimeters (mm).
TAKE 3 valid samples as a group, CALCULATE the average value as the test result.
6 Bipolar plate material density test
6.1 Test instruments and appliances
Test instruments and appliances include.
- Analytical balance. The precision is 0.1 mg;
- Thermometer. Used to determine the air temperature and water
temperature, the precision is 0.5 ??C;
- Metal wire. Nickel-chromium-iron or platinum-alloy wire, with a diameter of less than 0.2 mm, used for hanging specimen.
6.2 Sample preparation
6.2.1 The shape of the sample is square (5 cm x 5 cm) and the area is 25 cm2; the shape and size of the sample can also be determined through negotiation between the two parties.
6.2.2 The number of samples is 5 (guaranteed to obtain 3 valid values), there shall be no wrinkles, scratches and damage.
6.2.3 For different batches of bipolar plate materials, samples shall be taken separately; single materials are randomly sampled, and different materials are separately sampled.
6.2.4 USE anhydrous ethanol to rinse the sample, DRY it naturally, PLACE it in the desiccator to prepare for use.
6.2.5 REMOVE the grease from nickel-chrome wire and platinum wire, to
prepare for use.
6.3 Test methods
6.3.1 WEIGH the mass m1 of the sample and the mass m3 of the metal wire at a temperature of 25??C.
6.3.2 IMMERSE this sample which is suspended by the metal wire in distilled 7.2 Sample preparation
7.2.1 The shape of the sample is a square (5 cm x 5 cm), the area is 25 cm2. The shape and size of the sample can also be determined by the parties to the test.
7.2.2 The number of samples is 5 (guaranteed to obtain 3 valid values), they shall be free of wrinkles, scratches and breakage.
7.2.3 For different batches of bipolar plate materials, they shall be sampled separately; single materials shall be randomly sampled, different materials shall be separately sampled.
7.3 Test methods
7.3.1 Bulk resistivity test
7.3.1.1 Before each measurement, it shall calibrate the zero point of the test device. During measurement, it shall avoid the influence of such factors as sample deformation or sample surface dust accumulation.
7.3.1.2 USE a four-probe low-resistance measuring instrument to measure at least five locations near the edge and center of the sample, RECORD the bulk resistance at different locations.
7.3.2 Contact resistance test
7.3.2.1 As shown in Figure 3, INSTALL the sample on the test device. USE the low resistance meter to measure the electrical resistance, the measuring electrode is the gold-plated copper electrode. During the measurement, USE the carbon papers at both sides of the sample on which the fuel cell diffusion layer is placed as the support, to further improve the contact conditions. During the test, RECORD a resistance value for every 0.1 MPa increase in pressure, until the rate of change between the current resistance test value and the previous resistance test value is ??? 5%, it is considered that the minimum resistance value is reached, STOP the test. RECORD the resistance values at different pressures as R1.
Note. The measurement pressure range is generally 0.1 MPa ~ 3.0 MPa, it may select the resistance value when the pressure is 1.5 MPa.
7.3.2.2 In the same way, PLACE a sheet of carbon paper which is used for the fuel cell diffusion layer between two copper electrodes, APPLY a certain pressure. RECORD the resistance R2 at different pressures tested in the same manner as desc...

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