The bipolar plate, also known as the collector plate, is one of the important components of the fuel cell. It has the following functions and properties: separates fuel and oxidant, prevents gas from permeating; collects and conducts current, with high conductivity; designed and processed flow channels can evenly distribute gas to the reaction layer of the electrode for electrode reaction; can discharge heat , keep the battery temperature field uniform; corrosion resistance; shock and vibration resistance; thin thickness; light weight; at the same time, low cost, easy machining, suitable for batch manufacturing, etc.
Bipolar plates require proper surface treatment. The anode side of the bipolar plate has good electrical conductivity after nickel plating treatment, and is not easily wetted by the electrolyte, which can avoid electrolyte loss. The flexible contact between the electrolyte membrane and the bipolar plate outside the effective area of the electrode can effectively prevent the gas from leaking out, which is the so-called "wet seal". In order to reduce the corrosion of stainless steel by molten carbonate in the "wet seal" part, it is necessary to do "aluminizing" protection treatment on the bipolar plate frame