Fuel-cell systems are sensitive to weight, space and long-term environmental stability. Cu-Al conductors can reduce the mass of longer DC paths, but only when end interfaces, sealing and temperature-rise data are defined.
Decide where the composite conductor creates value
Long DC runs show the strongest mass benefit; short, frequently serviced ends place more emphasis on contact surfaces, fasteners and maintenance. Define the conductor body, end transition and equipment interface as separate materials and processes.
Manage moisture at the Cu-Al boundary
Aluminum, copper and the bonded interface respond differently to moisture, electrolyte and thermal cycling. Drawings should define cut ends, sealants, plating and drainage. Any corrosion result must state the exact material combination, finish and test duration.
- Record continuous, peak current and allowable temperature rise
- Test end voltage drop, pull force, bending and thermal cycling
- Include material compatibility and cleanliness around the hydrogen system
Supplier evidence for an early-stage RFQ
Ask for interface construction, end-processing windows, finish thickness, sealing method, lot traceability and test method in addition to dimensions. For concept work, use small lots on the real equipment interface before committing to volume tooling.