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| Detecting dimensions | Chinese Standard | International/EU standards | Core testing content |
|---|---|---|---|
| System Security and Performance |
GB/T 24549 GB/T 33978 |
IEC 62282-3-100 ISO 23828 |
Airtightness, overload response, emergency shutdown (cutting off hydrogen supply for<1 second). |
| Performance and durability of fuel cell stack | GB/T 20042 series | IEC 62282-2-100 | Polarization curve, 5000-10000 hour durability test (voltage attenuation rate ≤ 10%). |
| Vehicle mounted hydrogen system safety |
GB/T 26990 GB/T 29126 |
UN R134 (EU) HGV 3.1 (Hydrogen Storage Container) |
Fire test, shooting test, extreme temperature and pressure cycle. |
| Emissions and Environmental Protection | GB/T 34593 | EU 2018/858 | Tail exhaust hydrogen concentration (must be<4% LEL to prevent exhaust pipe explosion). |
The biggest risk of hydrogen fuel cells is hydrogen leakage and high-pressure hydrogen storage bottle explosion, so the detection focus is completely different from traditional batteries.
| test project | Test Method Overview | basis for determination |
|---|---|---|
| airtightness test | Helium leak detection or hydrogen sensor inspection | The total leakage rate of the system is less than 10 mL/h (vehicle grade), and fixed power generation is allowed to be slightly higher. |
| Emergency Shutdown (EMO) Test | Simulate hydrogen leak triggering alarm | The time from alarm to cutting off the main hydrogen valve is less than 1 second, and residual hydrogen gas must be blown clean with inert gas. |
| Extreme temperature start | -30 ℃ low temperature cold start | It must be successfully started and reach idle power within 30 seconds (without auxiliary heating). |
| Vibration and impact | Simulated Vehicle Vibration Spectrum (GB/T 2423) | After vibration, the torque attenuation of the hydrogen pipeline joint is less than 10%, and there are no cracks. |
This is the component with the highest threshold and longest cycle in hydrogen energy detection.
| Test Type | Standard Number | Extreme testing content | remark |
|---|---|---|---|
| Fire test | UN R134 | The bottle body must be placed in a 590 ℃ flame, and the pressure relief device (TPRD) must be activated to release pressure within 10 minutes. | Must not explode, only controllable release is allowed. |
| Shooting test | GB/T 35544 | Use 7.62mm armor piercing bullets to shoot gas cylinders filled with hydrogen gas. | Explosion is not allowed, leakage is allowed. |
| pressure cycle | ISO 19881 | Charge and discharge hydrogen 11000 times (simulating a lifespan of 15 years). | The blasting pressure after completion shall not be lower than 85% of the design value. |
| penetration test | GB/T 42612 | Measure the rate of hydrogen gas passing through the plastic liner. | Ultimate permeability<1 cc/L/hr (to prevent hydrogen accumulation inside the vehicle). |
The power system of fuel cell vehicles is required by ASIL B/C level.
Durability cycle conditions: Referring to GB/T 35178, simulate four cycles of start stop, idle, rated, and overload conditions, with a cumulative operation of ≥ 5000 hours per stack (passenger car).
Single cell voltage monitoring (CVM) failure: Simulate a single battery voltage that is too low, and the system must reduce the load protection within 100ms to prevent the reverse electrode from burning out the membrane electrode.
Functional safety objective: Prevent unexpected hydrogen release (Safety Goal), Safety Integrity Level ASIL C.
If you are concerned about MW level hydrogen storage power plants (hydrogen electric coupling), you also need to pay attention to:
| rule | zone of application | core requirements |
|---|---|---|
| Grid fault crossing | China GB/T 36558 | When the grid voltage drops to 20%, the hydrogen power generation system must operate without disconnecting for 0.625 seconds. |
| Hydrogen purity certification | Global ISO 14687 | The purity of hydrogen entering the fuel cell stack must be ≥ 99.97%, with sulfide and CO content<0.2 ppm. |
| CE certification (PED directive) | European Union | Hydrogen storage pressure vessels must comply with the 2014/68/EU Pressure Equipment Directive and be inspected in Module G mode. |
| Standard Number | name | Implementation/Release Status | influence |
|---|---|---|---|
| GB 50516 | Technical specifications for hydrogen refueling stations (revised) | Implemented | Clearly define the fire separation distance between hydrogen storage containers within the station and surrounding buildings. |
| GB/T 37154 | Hydrogen emission testing of fuel cell electric vehicles | Under revision | Increase the requirement for continuous monitoring of tail hydrogen concentration under dynamic operating conditions. |
| GB/T 42626 | Periodic inspection of compressed hydrogen fiber wrapped gas cylinders for vehicles | Implemented | Require gas cylinders to be inspected every 3 years and use acoustic emission to detect cracks in the inner liner. |
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