GB/T 38954-2020 in English

GB/T38954-2020 is my country's first national standard for hydrogen fuel cell power generation systems for drones, which specifies the technical requirements for drone power systems with an empty mass of ≤116kg and a maximum take-off mass of ≤150kg. The standard contains 7 chapters of main content and 2 informative appendices, focusing on clarifying key indicators such as system performance, safety control, and test methods.

The standard constructs a three-level safety protection system:

1. Intrinsically safe design: requires that a single fault does not escalate (4.2.4), and key components must pass special certifications such as GB/T36288
2. Real-time monitoring system: includes 15 types of mandatory monitoring parameters (5.20.2), such as hydrogen pressure, stack temperature, etc.
3. Emergency response mechanism: When the hydrogen concentration in the cabin is greater than 50% LEFL, the alarm must be automatically triggered (5.15)

Special provisions require the fuel system to adopt redundant safety components, including multiple protection devices such as pressure relief valves and over-current valves (3.9).

Key Points for Product Development

• Give priority to hydraulic hose assemblies that comply with GB/T15329
• The control module must meet the functional safety SIL2 requirements of GB/T20438.1
• It is recommended to add vibration isolation design to meet the vibration resistance requirements of 5.11

Test and Certification Process

1. Complete the environmental adaptability pretreatment specified in Section 6.1
2. Perform 500-hour accelerated life test according to Appendix A
3. Pass the electromagnetic compatibility test of GB/T17626.3
4. Noise testing must be performed in an anechoic chamber according to GB/T4980

For the first time, this standard incorporates the auxiliary energy storage module into the system boundary (Figure 1), reflecting the trend of hybrid technology. Compared with traditional power systems:

• Energy density increased by 2-3 times (typical value > 800Wh/kg)
• Operating temperature range extended to -5~40℃ (4.4.1)
• Supports digital interfaces such as CAN bus (5.13)

It is worth noting that the standard reserves space for the expansion of test methods for key parameters such as hydrogen supply flow (5.14) and exhaust gas concentration (5.16).