A bipolar plate is a type of electrochemical cell component that acts as a separator between two electrodes, allowing current to pass between them while preventing them from coming into contact with each other. It is usually made from a conductive material, such as graphite or metal, and is used in batteries, electrolyzers, and fuel cells. The bipolar plate helps to improve the efficiency of the cell by reducing the internal resistance and providing a larger surface area for the electrochemical reactions.