Electrochemical device and method for producing an electrochemical unit for an electrochemical device

A method for producing an electrochemical unit for an electrochemical device in which a plurality of electrochemical units succeed one another in a stacking direction,

• wherein the electrochemical unit includes an electrochemically active membrane electrode assembly, at least one gas diffusion layer and a bipolar plate having at least one flow field for at least one fluid medium and at least one edge web, which borders a flow field of the bipolar plate at least in certain areas and is in contact with a gas diffusion layer adjacent to the bipolar plate, and
• wherein the method includes the following:
• arranging the gas diffusion layer on the bipolar plate or on a bipolar plate layer of the bipolar plate;
• producing a flow field seal element on the bipolar plate or the bipolar plate layer and on the gas diffusion layer such that the flow field seal element is in contact both with the bipolar plate or the bipolar plate layer and also with the gas diffusion layer;
• providing two bipolar plates that succeed one another in the stacking direction on mutually facing sides with a respective edge web that is in contact with a respective flow field seal element, wherein the flow field seal elements with which the edge webs of the bipolar plates are in contact abut against one another in sealing manner.