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US 2026/0128331 A1Published application
Fuel cell coolant over-pressurization system
AssigneeHoneywell International Inc.
InventorsPavel Trnka, Filip Brenner, Jan Macka, Ondrej Kotaba, Jaroslav Tesar, Martin Zlomek
Life of this patent
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Abstract
A system includes a fuel cell stack. A liquid coolant loop is coupled to provide coolant to the fuel cell stack. An expansion tank is coupled to the coolant loop and has an expansion tank inlet to couple to a fuel cell stack cathode inlet. An inlet check valve has a relative cracking pressure dpin and is coupled between the fuel cell stack cathode inlet and the expansion tank inlet to over-pressurize the coolant in the coolant loop.
Claims20
A system comprising:
- a fuel cell stack;
- a liquid coolant loop coupled to provide coolant to the fuel cell stack;
- an expansion tank coupled to the coolant loop;
- an expansion tank inlet to couple to a fuel cell stack cathode inlet;
- an inlet check valve with a relative cracking pressure dpin coupled between the fuel cell stack cathode inlet and the expansion tank inlet.
2 more elements
A method comprising:
- providing liquid coolant to a fuel cell stack via a coolant loop;
- providing air to a cathode input of the fuel cell stack;
- and
- maintaining a pressure of the liquid coolant in the fuel cell stack greater than a pressure of gas in the cathode wherein a difference in pressure is within a selected range of pressures.
1 more element
A system comprising:
- a fuel cell stack having a cathode input;
- a coolant loop coupled to cool the fuel cell stack;
- and
- means for maintaining a pressure of coolant in the fuel cell stack to be greater than a pressure of gas in the cathode.
1 more element
Dependencies are inferred from the claim text.