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GB/T 26990-2023 PDF in English


GB/T 26990-2023 (GB/T26990-2023, GBT 26990-2023, GBT26990-2023)
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GB/T 26990-2023: PDF in English (GBT 26990-2023)

GB/T 26990-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.01
CCS T 47
Replacing GB/T 26990-2011, GB/T 29126-2012
Fuel cell electric vehicles - Onboard hydrogen system
technical specifications
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: NOVEMBER 27, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Measurement parameters, units, accuracy, resolution ... 6
5 Requirements ... 6
5.1 General requirements ... 6
5.2 Safety protection requirements ... 7
5.3 Installation strength requirements ... 7
5.4 Air tightness requirements ... 8
5.5 Environmental adaptability requirements ... 8
6 Test conditions ... 9
7 Test methods ... 9
7.1 Test method of main shut-off valve ... 9
7.2 Test method of installation strength ... 10
7.3 Test method of air tightness ... 11
7.4 Test method of environmental adaptability ... 13
Appendix A (Informative) Schematic diagram of onboard hydrogen system ... 19
Appendix B (Informative) Conversion of hydrogen and helium leak rate ... 20
Fuel cell electric vehicles - Onboard hydrogen system
technical specifications
1 Scope
This document specifies the technical requirements and test methods for on-board
hydrogen systems of fuel cell electric vehicles.
This document applies to fuel cell electric vehicles, that use compressed gaseous
hydrogen as fuel and have an operating pressure not exceeding 70 MPa, at an ambient
temperature of 15 °C.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 2423.4 Environmental testing for electric and electronic products - Part 2: Test
method - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
GB/T 2423.17 Environmental testing for electric and electronic products - Part 2:
Test method - Test Ka: Salt mist
GB/T 2423.43 Environmental testing for electric and electronic products - Part 2:
Test methods - Mounting of specimens for vibration, impact and similar dynamic
tests
GB/T 2423.56 Environmental testing - Part 2: Test methods - Test Fh: Vibration,
broadband random and guidance
GB/T 24548 Fuel cell electric vehicles - Terminology
GB/T 24549 Fuel cell electric vehicles - Safety requirements
3 Terms and definitions
The terms and definitions as defined in GB/T 24548 and GB/T 24549, as well as the
following terms and definitions, apply to this document.
be complete. The hydrogen cylinders, valves, pipelines, pipeline joints shall not be
damaged. The installation brackets shall have clear anti-loosening marks. The high-
pressure pipeline shall be made of materials with proven good hydrogen compatibility.
If austenitic stainless steel is selected, its nickel content should be greater than 12%.
5.1.2 The on-board hydrogen system shall be manufactured in accordance with the
product drawings and other technical documents approved by the prescribed procedures.
The hydrogenation port, hydrogen storage cylinder, valves and other components shall
comply with relevant standards; a product certificate and batch inspection certificate
shall be provided.
5.1.3 Each hydrogen storage cylinder shall be equipped with a manual stop valve, which
can be used to isolate each hydrogen storage cylinder individually, during
hydrogenation, dehydration or maintenance.
5.2 Safety protection requirements
5.2.1 In order to prevent the pressure downstream of the pressure regulator from
abnormally increasing, the following two methods can be used:
a) Discharge hydrogen gas through safety pressure relief device;
b) Turn off the hydrogen supply upstream of the pressure regulator.
5.2.2 An over-flow protection device or other measures shall be set up to automatically
shut off the hydrogen supply from the hydrogen storage cylinder, when the device that
detects the pressure in the hydrogen storage cylinder or pipeline detects an abnormal
decrease in pressure or an abnormal increase in flow rate. The over-flow protection
valve, if use, shall be installed on or close to the main shut-off valve.
5.2.3 The main shut-off valve, hydrogen storage cylinder's one-way valve, temperature
driven safety pressure relief device (TPRD) shall be installed at the end of the hydrogen
storage cylinder. The operation of the main shut-off valve shall be electric. The test shall
be carried out in accordance with the provisions of 7.1. It shall be ensured that it opens
normally when the power is turned on and closes automatically when the power is
turned off.
5.3 Installation strength requirements
5.3.1 After the hydrogen storage cylinder (group) is installed and tightened, conduct a
dynamic impact test according to the provisions of 7.2.2. It shall be ensured that the
hydrogen storage cylinder (group) is still fixed on the fixed seat; the fastening parts
shall not be deformed, broken, loosen, etc.
5.3.2 After the hydrogen storage cylinder (group) is installed and tightened, conduct a
static thrust test according to the provisions of 7.2.3. It shall be ensured that the relative
displacement of the fixed point of the hydrogen storage cylinder (group) and its holder
is not greater than 13 mm.
5.4 Air tightness requirements
5.4.1 The cylinder, valve, pipeline and each connection shall be well sealed. They shall
be tested according to the test method in 7.3.
5.4.2 When using a gas detector to test air tightness, the hydrogen leakage rate at each
detection point in each stage shall not be greater than 0.167 mL/min or the leakage
concentration shall not be greater than 300 mL/m3. See Appendix B for the calculation
of leakage rate conversion between different gases.
5.5 Environmental adaptability requirements
5.5.1 The test pressure shall be the nominal working pressure of the on-board hydrogen
system.
5.5.2 Environmental adaptability test includes high and low temperature test, damp heat
test, vibration test, salt spray test. After each test, the air tightness of the system under
the nominal working pressure shall be checked and meet the requirements of 5.4.2.
When all tests are finished, the action of the main shut-off valve shall be tested
according to the provisions of 7.1 and meet the requirements of 5.2.3. The test sequence
and requirements are as follows:
a) After the on-board hydrogen system is subjected to high and low temperature tests
according to the method specified in 7.4.1, there shall be no cracks, deformations,
loose connections, etc.;
b) After the on-board hydrogen system is subjected to the damp heat test according
to the method specified in 7.4.2, there shall be no corrosion, surface peeling, loose
connections, etc.;
c) After the on-board hydrogen system is subjected to the vibration test according to
the method specified in 7.4.3, there shall be no cracks, deformations, loose
connections, etc.;
d) After the on-board hydrogen system is subjected to the salt spray test according
to the method specified in 7.4.4, there shall be no corrosion, surface peeling, loose
connections, etc.
6 Test conditions
6.1 During the test, the atmospheric pressure shall be no less than 91 kPa; the
temperature shall be between 5 °C and 35 °C; the relative humidity shall be less than
95%; the test site shall be kept dry.
6.2 Measure the wind speed at a height of 1.2 m above the ground at the test site. The
average wind speed shall be less than 3 m/s and the gust shall be less than 5 m/s.
6.3 Unless otherwise specified, the test gas shall be clean dry hydrogen, dry helium or
a mixture of 10% helium and 90% nitrogen.
7 Test methods
7.1 Test method of main shut-off valve
Connect the pipeline downstream of the main shut-off valve to the flow detection device,
pressure detection device, stop valve (as shown in Figure 1). For multiple cylinder
groups, each main shut-off valve shall be tested one by one. During the test, the non-
test main shut-off valve is in a manual cut-off closed state.
Fill the hydrogen storage cylinder (group) with test gas to the nominal working pressure.
Close the shut-off valve and energize the main shut-off valve to open according to
technical requirements, until the pressure in the downstream pipeline is consistent with
the pressure in the cylinder.
- Keep the main shut-off valve energized; open the shut-off valve; monitor the
pressure and flow changes in the downstream pipeline, to ensure that the flow does
not exceed the limit value specified by the manufacturer. If after a period of time,
the downstream pressure and flow rate remain stable and within the normal range,
the main shut-off valve opens normally. The test is repeated three times.
- Control the main shut-off valve to cut off power. Open the shut-off valve. Monitor
the pressure and flow changes in the downstream pipeline. If after a period of time,
the downstream pressure is normal pressure and the flow rate is 0, the main shut-
off valve closes normally. The test is repeated three times.
● 5 g acceleration in the upward direction of the vertically fixed base.
c) For category M3 and N3 vehicles, they shall withstand:
● 6.6 g acceleration in the forward direction of the car;
● 5 g acceleration in either direction of the car;
● 5 g acceleration in the upward direction of the vertically fixed base.
7.2.3 Static test
The test method of static installation strength is as follows:
- Adjust the force application mechanism, so that the force application point passes
through the center of gravity of any hydrogen storage cylinder. The force
application directions are the forward direction of the car, either the left or right
directions of the car, the upward direction of the vertically fixed base. The force
application size is 8 times the mass of the hydrogen storage cylinder after it is filled;
- Apply force to the test object. When it reaches the set value, it will automatically
stop applying force. Record the force and displacement data in real time. Draw the
"force-displacement" relationship curve.
7.3 Test method of air tightness
7.3.1 Gas replacement
Gas sampling and analysis shall be carried out after replacement. The volume
concentration of oxygen shall not exceed 0.5%.
7.3.2 Air tightness test
Test as follows.
a) Fill test gas to the set pressure through the hydrogenation port and maintain the
pressure. The 35 MPa on-board hydrogen system and the 70 MPa on-board
hydrogen system are pressurized, according to the steps in Table 2 and Table 3,
respectively.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.