Channel-less proton exchange membrane fuel cell
View Patent ↗The present invention is a proton exchange membrane fuel cell that includes a fuel cell assembly. The fuel cell assembly includes a bipolar separator, which includes an anode separator, a cathode separator and a membrane electrode assembly. The bipolar separator includes a highly porous, electrically conductive, non-metallic interface and a non-porous frame. The highly porous interface includes micro-channels for fluid communication and diffusion. Both the cathodic interface and anodic interface of the bipolar separator contain the highly porous material in a fluid diffusion region that interfaces with the active area of the MEA interposed between two bipolar separators. The highly porous material connects the fluid diffusion regions with their respective external sources of oxidant and fuel. The bipolar separator includes a non-porous frame that seals the highly porous material and isolates the fluids within the proton exchange membrane fuel cell.
1. An electrochemical fuel cell stack, comprising at least one fuel cell assembly, wherein said fuel cell assembly comprises:
a. an anode separator, comprising electrically conductive, non-metallic material, wherein said material is a carbon paper product that is highly porous and includes micro-channels, and further, wherein said anode separator comprises at least one fuel ingress and at least one means for fuel distribution from said fuel ingress to an anode flow field;
b. a cathode separator, comprising electrically conductive, non-metallic material, wherein said material is a carbon paper product that is highly porous and includes micro-channels, and further, wherein said cathode separator comprises at least one oxidant ingress and at least one means for oxidant distribution from said oxidant ingress to a cathode flow field;
c. a membrane electrode assembly interposed between said anode separator and said cathode separator, wherein said membrane electrode assembly comprises a proton exchange membrane interposed between an anode and a cathode; and
d. a coolant separator interposed between said anode separator and said cathode separator, wherein said coolant separator comprises:
(i) electrically conductive, non-metallic material, wherein said material is a carbon paper product that is highly porous and includes micro-channels;
(ii) at least one coolant ingress;
(iii) at least one means for coolant distribution from said coolant ingress to a coolant flow field;
(iv) at least one coolant egress; and
(v) at least one means for coolant distribution from said coolant flow field to said coolant egress.