Bipolar plate for a fuel cell and fuel cell stack

摘要

A bipolar plate which can be produced particularly economically for a fuel cell, with which a high degree of efficiency is guaranteed over a long service life. The bipolar plate has a core layer consisting of a steel material, the surfaces of said core layer, which are associated with the respective electrolyte carriers of the fuel cell, having a corrosion protection layer, protecting the core layer against corrosion. The corrosion protection layers consist of a metal material and extend on both sides over the whole surface of the core layer. At the same time the corrosion protection layers are in turn coated over the whole surface with an electrically conductive functional coating, which is essentially entirely impermeable for the metal ions emerging from the core layer and/or the corrosion protection layers. The invention likewise relates to at least one fuel cell comprising a bipolar plate according to the invention.

主权项

1. A bipolar plate for a fuel cell with a core layer consisting of a steel material, the surfaces of said core layer, which are associated with the respective electrolyte carriers of the fuel cell, being provided in each case with a corrosion protection layer, protecting the core layer against corrosion,
wherein the corrosion protection layers consist in each case of a metal material and extend in each case on both sides over the whole surface of the core layer; wherein the corrosion protection layers are in turn coated in each case over the whole surface with an electrically conductive functional coating, which is essentially entirely impermeable for the metal ions emerging from the core layer, the corrosion protection layers, or both; wherein the metal material of at least one of the corrosion protection layers is a steel material with a higher corrosion resistance than the steel material of the core layer; and wherein the functional coating comprises two layers in which the first layer is applied directly onto the corrosion protection layer and formed as an amorphous C/H coating or plasma polymer coating and in which the second layer is applied on the first layer and formed from a conductive inorganic compound.