Toughened Carbon-Polymer Bipolar Plate
Main Product Description
Many conventional weldable flexible-graphite bipolar plates adopt carbon-fiber reinforcing networks, yet project planners are continuously seeking cost-balanced alternatives with robust chemical tolerance for long-duration electrochemical service. This composite bipolar plate leverages continuous basalt-fiber filaments sourced from natural volcanic rock as its internal reinforcing backbone, rather than carbon-fiber reinforcements.
Basalt fibers extend outward toward the plate's outer boundary during composite molding, forming two functionally-separated zones within a single monolithic substrate. The central graphite-rich domain serves as the primary electrochemically-active region, undertaking current conduction and core electrochemical reactions for cell operation. The surrounding peripheral band is enriched with thermoplastic polymer, creating weld-compatible borders suitable for thermal welding processes.
This dual-functional layout removes heavy reliance on auxiliary gaskets during stack assembly. Thermal welding along plate peripheries tightens module sealing and suppresses hydrogen cross-leakage risks. Thanks to basalt-fiber reinforcement, the composite maintains stable mechanical properties while bringing cost-optimized material performance compared to carbon-fiber-based counterparts, well-suited for large-scale energy-storage stack deployment.
We support custom adjustments for thickness, width and length to match client-specific stack layouts. Every production batch undergoes multi-item performance validation covering mechanical strength, gas barrier performance and conductive-zone conductivity before shipment.
|
Item |
Unit |
Parameter |
|
Thickness |
mm |
0.6 / 0.8 |
|
Density |
g/cm³ |
1.4-1.6 |
|
Max Width |
mm |
≤850 |
|
Max Length |
mm |
≤1300 |
|
Tensile Strength |
MPa |
≥50 |
|
Compressive Strength |
MPa |
≥100 |
|
Conductive-zone Conductivity |
S/cm |
≥300 |
|
Welding-zone Conductivity |
S/cm |
0 |
|
Carbon Content |
% |
≥80 |
|
Hydrogen Transmission Rate @0.2 MPa |
cm³/cm²·min |
<5×10⁻⁶ |
|
Corrosion Current |
A |
<5×10⁻⁶ |
FAQ
Q: What benefits does basalt-fiber reinforcement bring versus carbon-fiber versions?
A: Basalt fiber delivers competitive mechanical performance with better cost efficiency for large-volume projects, retaining the dual-zone weld-edge architecture for simplified stack sealing.
Q: Why is conductivity zero within the welding perimeter?
A: The outer perimeter is formulated with high thermoplastic content optimized for thermal welding; this section focuses on sealing performance instead of electrical conduction.
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