Bipolar plate and membrane electrode unit for a fuel cell arranged in a fuel cell stack, fuel cell and fuel cell stack
View Patent ↗The invention relates to a bipolar plate ( 1 ) for a fuel cell ( 100 ) comprising a profiled anode plate ( 7 ) and a profiled cathode plate ( 8 ), each having an active region ( 6 ) as well as two distributor regions ( 2 ) for supply and discharge of operating media to or from the active region ( 6 ), wherein the distributor regions ( 2 ) each have one main anode gas port ( 3 ) for supply and discharge of fuel, one main cathode gas port ( 4 ) for supply and discharge of oxidizer, which is arranged in such a manner that cathode channels ( 41 ) extending therefrom run straight, at least across the distributor region ( 2 ) of the bipolar plate ( 1 ), and have a flow direction that corresponds to a main flow direction in the cathode channels ( 41 ) in the active region, as well as a main coolant port ( 5 ) for the supply and discharge of coolant. It is provided according to the invention that the main coolant port ( 5 ) and the main anode gas port ( 3 ) are adjacent to one another, adjacent to the main cathode gas port ( 4 ), and are arranged out of alignment with the active region.
1. A bipolar plate for a fuel cell, the bipolar plate comprising:
a profiled anode plate and a profiled cathode plate, the bipolar plate having an active region and two distributor regions for supply and discharge of operating media to and from the active region, wherein the distributor regions each have:
one main anode gas port for supply or discharge of fuel;
one main cathode gas port for supply or discharge of oxidizing agent, which is arranged in such a manner that cathode channels extending therefrom run straight at least across the distributor region of the bipolar plate and have a flow direction that corresponds to a main flow direction in the cathode channels in the active region; and
one main coolant port for supply or discharge of coolant;
wherein the anode and cathode plates are formed and arranged atop each other in such a manner that the bipolar plate has channels for the operating media that connect the main operating media ports of the two distributor regions;
wherein the distributor regions have a first overlapping section in which cathode channels and anode channels overlap each other in a non-fluid communicating manner, and a second overlapping section in which anode channels and coolant channels overlap each other in a non-fluid communicating manner; and
wherein the main coolant port and the main anode gas port are adjacent to one another, are collectively adjacent to the main cathode gas port, and are arranged out of alignment with the active region.
2. The bipolar plate according to claim 1 , wherein the first overlapping section is arranged in an extension direction of the active region relative to its alignment.
3. The bipolar plate according to claim 1 , wherein the first overlapping section has the shape of a triangle.
4. The bipolar plate according to claim 1 , wherein the first overlapping section is arranged in such a manner that a first side edge of the first overlapping section runs as an extension of an edge of the active region.
5. The bipolar plate according to claim 1 , wherein the first overlapping section is arranged in such a manner that a side edge of the first overlapping section runs with a border line of the active region perpendicular to its extension direction.
6. The bipolar plate according to claim 1 , wherein the second overlapping section is arranged out of alignment with the active region.
7. The bipolar plate according to claim 1 , wherein a flow direction of the anode gas runs in the anode channels in the second overlapping section in a direction facing away from the active region.
8. A method of fabricating a bipolar fuel cell plate having an active region and two distributor regions for supply and discharge of operating media to and from the active region, comprising:
forming a profiled anode plate and a profiled cathode plate and arranging the anode and cathode plates atop each other in such a manner that:
the distributor regions each have:
one main anode gas port for supply or discharge of fuel;
one main cathode gas port for supply or discharge of oxidizing agent, which is arranged in such a manner that cathode channels extending therefrom run straight at least across the distributor region of the bipolar plate and have a flow direction that corresponds to a main flow direction in the cathode channels in the active region; and
one main coolant port for supply or discharge of coolant;
the bipolar plate has channels for the operating media that connect the main operating media ports of the two distributor regions;
the distributor regions have a first overlapping section in which cathode channels and anode channels overlap each other in a non-fluid communicating manner, and a second overlapping section in which anode channels and coolant channels overlap each other in a non-fluid communicating manner; and
the main coolant port and the main anode gas port are adjacent to one another, are collectively adjacent to the main cathode gas port, and are arranged out of alignment with the active region.
9. The method of claim 8 wherein the anode and cathode plates are formed and arranged in such a manner that the first overlapping section is arranged in an extension direction of the active region relative to its alignment.
10. The method of claim 8 wherein the anode and cathode plates are formed and arranged in such a manner that the first overlapping section has the shape of a triangle.
11. The method of claim 8 wherein the anode and cathode plates are formed and arranged in such a manner that the first overlapping section is arranged in such a manner that a first side edge of the first overlapping section runs as an extension of an edge of the active region.
12. The method of claim 8 wherein the anode and cathode plates are formed and arranged in such a manner that the first overlapping section is arranged in such a manner that a side edge of the first overlapping section runs with a border line of the active region perpendicular to its extension direction.
13. The method of claim 8 wherein the anode and cathode plates are formed and arranged in such a manner that the second overlapping section is arranged out of alignment with the active region.
14. The method of claim 8 wherein the anode and cathode plates are formed and arranged in such a manner that a flow direction of the anode gas runs in the anode channels in the second overlapping section in a direction facing away from the active region.