Fuel cell system

Patent metadata

Field	Value
Publication number	US-9614238-B2
Application number	US-201214240121-A
Country	US
Kind code	B2
Filing date	Jul 21, 2012
Priority date	Aug 24, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A fuel cell system includes at least one fuel cell and a humidifying device for humidifying a supply air flow flowing to a cathode chamber of the fuel cell by an exhaust air flow discharged from the cathode chamber of the fuel cell. The supply air flow and the exhaust air flow are separated from one another by water vapor-permeable membranes. An anode water separator, through which exhaust gas from an anode chamber of the fuel cell flows, is integrated into the humidifying device.

First claim

The invention claimed is:

1. A fuel cell system, comprising:
at least one fuel cell;
a humidifying device having a first region and a second region arranged below the first region, the humidifying device structurally configured to humidify a supply air flow flowing to a cathode chamber of the fuel cell by an exhaust air flow discharged from the cathode chamber of the fuel cell, wherein the first region receives the supply air flow and the second region receives the exhaust air flow and the first and second regions are separated from one another by water vapor-permeable membranes; and
an anode water separator structurally configured so that exhaust gas from an anode chamber of the fuel cell flows through the anode water separator, wherein the anode water separator is integrated into the humidifying device and arranged below the water vapor-permeable membranes.

2. The fuel cell system according to claim 1 , further comprising:
a cathode water separator structurally configured so that the exhaust air flows through the cathode water separator, wherein the cathode water separator is integrated into the humidifying device.

3. The fuel cell system according to claim 1 , further comprising:
a humidifier bypass line, having a valve unit, integrated into the humidifying device, wherein the humidifier bypass line is structurally configured to bypass a humidifier of the humidifying device.

4. The fuel cell system according to claim 1 , further comprising:
at least one heat exchanger structurally configured so that cooling medium of a cooling circuit of the fuel cell flows through the at least one heat exchanger, wherein the at least one heat exchanger is integrated into the humidifying device.

5. The fuel cell system according to claim 1 , further comprising:
an intercooler for the supply air flow, which is cooled by a cooling medium or the exhaust air flow, wherein the intercooler is integrated into the humidifying device.

6. The fuel cell system according to claim 1 , further comprising:
a turbine which is structurally configured so that it is acted on by the exhaust air flow, wherein a turbine exhaust air line for a turbine exhaust air flow is mechanically connected to the humidifying device or integrated into the humidifying device.

7. The fuel cell system according to claim 1 , wherein the anode water separator is structurally configured so that it is switchably connected to one or more components of a cathode side of the fuel cell system via at least one valve unit.

8. The fuel cell system according to claim 1 , wherein the anode water separator is structurally configured so that it is switchably connected to one or more components of cathode side of the fuel cell system via at least two valve units, a first one of the two valve units branching off from the anode water separator in such a way that primarily a liquid volume flow passes through the first one of the two valve units, and a second one of the two valve units branching off in the anode water separator in such a way that primarily a gaseous volume flow passes through the second one of the two valve units.

9. The fuel cell system according to claim 2 , wherein the anode water separator is structurally configured so that it is switchably connected to the cathode water separator.

10. The fuel cell system according to claim 6 , wherein the anode water separator is structurally configured so that it is switchably connected to the turbine exhaust air flow.

11. The fuel cell system according to claim 1 , wherein the anode water separator is structurally configured so that it is switchably connected to the supply air flow.

12. The fuel cell system according to claim 7 , wherein the fuel cell and the humidifying device are integrated in a manner to form a structural unit, so that when the at least one valve unit is open, water from the anode water separator flows into the cathode chamber of the fuel cell due to the force of gravity.

13. The fuel cell system according to claim 1 , wherein the humidifying device is arranged on top of the at least one fuel cell to form a structural unit.

Assignees

• Handgraetinger Markus
• Muetschele Armin
• Richter Holger
• Runde Miriam
• Daimler Ag

Inventors

• Handgraetinger Markus
• Muetschele Armin
• Richter Holger
• Runde Miriam

Classifications

• H01M8/04029 Primary

  Heat exchange using liquids · CPC title

• H01M8/04111

  using a compressor turbine assembly · CPC title

• H01M8/04253

  Means for solving freezing problems · CPC title

• H01M8/04141 Primary

  by water containing exhaust gases · CPC title

• H01M8/04067

  Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins · CPC title