Reinforced Flexible Graphite Bipolar Plate

Traditional flexible graphite sheets often suffer from brittleness, which raises failure risks during stack stacking and module assembly. To mitigate such drawbacks, this composite bipolar plate adopts an inter-penetrating carbon-fiber network as internal reinforcing phase to upgrade mechanical robustness without sacrificing graphite's intrinsic electrical transport capacity.

Even undergoing full 360-degree folding cycles, the composite substrate will not crack or develop internal fractures, while sustaining in-plane electrical conductivity above 320 S/cm. Its mechanical properties satisfy stack-assembly load requirements: minimum compressive strength hits 100 MPa alongside flexural strength reaching 50 MPa. When exposed to 0.15 MPa differential pressure, hydrogen gas crossover is restricted below 5×10⁻⁶ cm³/cm²·min, effectively suppressing cross-gas mixing inside cell assemblies.

Thanks to continuous carbon-fiber filaments extending all the way toward board peripheries, the outer borders of this bipolar plate become weld-accessible. This special structural trait removes obstacles for perimeter welding operations, streamlining sealing workflows and improving overall structural integrity of finished electrochemical modules. It works well across PEM fuel-cell stacks, water-splitting electrolyzers as well as large-scale redox flow battery systems.

We support dimension customization for thickness, width and length to match client-specific stack layouts. Each batch undergoes multi-item performance inspection covering mechanical resilience, gas permeability and conductive performance before delivery.

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