Bipolar plate and method for producing a bipolar plate

A bipolar plate for electrochemical cells, constructed from two half-plates situated one above the other, comprising:

• three ports arranged next to each other, an active field and a distributor field which connects the ports to the active field and is designed to conduct three different fluids between the ports and the active field, wherein a flow space for one of the fluids is formed between the half-plates and flow spaces for the other two fluids are formed on outer sides of the half-plates, wherein the distributor field comprises four flow fields of flat design, comprising:
• one coolant flow field which is open to a central port,
• two two-media flow fields which each at one end adjoin the coolant flow field and at the other end are open to one of two outer ports and which are each designed for coolant to flow through and with an operating medium as a further fluid in layers that are parallel to each other,
• one three-media flow field which adjoins the two two-media flow fields, is open to the active field and is designed for coolant to flow through and with an operating media as further fluids in three layers that are parallel to each other,
• wherein the half-plates are structured by embossed structures, which are designed as points, that is to say in the form of islands, in each of the four flow fields in such a way that the half-plates are supported both against each other and against flat components arranged outside the half-plates.