Bipolar plates are mainly divided into graphite bipolar plates (hard graphite bipolar plates and flexible graphite bipolar plates), composite bipolar plates and metal bipolar plates. Among them, hard graphite through mechanical grinding and carving, hard graphite bipolar plate corrosion resistance and conductivity are good, can meet the fuel cell use, but the type of bipolar plate brittle, lack of toughness, and is the processing cost is high, is not suitable for batch preparation. And foreign countries developed a flexible graphite bipolar plate, with high conductivity and corrosion resistance, but also has a certain toughness, can be moulded batch production, is the more ideal fuel cell bipolar plate, but flexible graphite bipolar plate raw material strength is limited, the thickness of the bipolar plate prepared on the thicker side, the finished plate thickness of about 2mm ~ 3mm, resulting in a large volume of fuel cell stacks, is not conducive to the increase in the volume of the battery than the power. The bipolar plate is an important component in the liquid flow battery, which is used to realise the series connection and separation of multiple cells, the conduction of the current generated in the cell, and to provide support for the reaction electrode in the liquid flow battery. Therefore, the bipolar plate needs to have good electrical conductivity, high mechanical strength, considerable air tightness and strong corrosion resistance, and at the same time, the bipolar plate with good application prospects also needs to have the characteristics of reprocessing and low cost. At present, the bipolar plate material type mainly includes graphite bipolar plate, graphite-based composite bipolar plate and metal bipolar plate.
Flexible composite graphite bipolar plate extrusion line
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