Proton Exchange Membrane Fuel Cell (PEMFC) Bipolar Plate (BPP)
modules.brochure_downloadBipolar plates are produced from two different types of materials based on metal or composite graphite. Metal based bipolar plates are produced by forming metal foils under pressure, while composite based plated are produced with machining method. These plates have different shock/vibration, and thermal profiles. For metallic bipolar plates, basic production method includes; design, pre-treatment, precision moulding, laser welding/cutting, cleaning before coating, coating, sealing, inspection and product delivery steps respectively.
TECHNICAL SPECIFICATIONS
| Carbon Composite based | Metal based | |
| Advantages | Excellent corrosion resistance | Suitable for serial production |
| Low cost, traditional stainless steel foil | ||
| Simple design | High volumetric power density | |
| High electrical conductivity after coating | ||
| High mechanical stability | ||
| Disadvantages | High material cost | Low corrosion resistance |
| Low electrical conductivity | ||
| Low volumetric power density | Relatively difficult design | |
| Brittle material |
| Features of Metal Based Plate | |
| Feature Description | Numerical Values |
| Physical Properties | |
| Net weight (g) | 85 |
| External measurements (mm) | 1.0 (thickness) X 143 (length) X 447 (width) |
| Active area (mm2) | 260 X 113.5 = 295.1 |
| Flatness (mm) | < 2 |
| Manifold area of cathode side (mm2) *1 | 1327 |
| Manifold area of cooling side (mm2) | 1381 |
| Manifold area of anode side (mm2) *2 | 522 |
| Available channel length (mm) | 283.6 |
| Integrated Gasket Option | |
| Gasket channel width (mm) | 4 |
| Gasket dimensions (mm) | 430 X 126 |
| Gasket materials | FKM/VMQ |
| Gasket compression ratio | Approximately 25% |
| Features of Metallic Plate | |
| Metallic plate material | EN 1.4404 |
| Metallic plate thickness (mm) | 0.07-0.12 |
| Coating Properties | |
| ICR (interface contact resistance) | < 10mΩ X cm2 @140N |
| Results of Corrosion Test | <1µA/cm2 @ -0.2V / +0.6V |
| Coating thickness (nm) | Approximately 250 |
*1 Arranged for air feed.
*2 Arranged for hydrogen feed.