Patent ID: 11916263
Assignee: BLOOM ENERGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A fuel cell stack, comprising:
interconnects stacked over one another;
fuel cells disposed between the interconnects, facing fuel and air flow fields of adjacent interconnects;
a fuel inlet riser at least partially defined by the inlets of the interconnects and configured to provide fuel to the fuel flow fields;
a fuel outlet riser at least partially defined by fuel outlets of the interconnects and configured to receive anode exhaust from the fuel flow fields;
riser seals disposed on a riser seal region of each interconnect and configured to prevent fuel in the fuel inlet and outlet risers from entering the air flow fields; and
perimeter seals disposed on a perimeter seal region of each interconnect and configured to prevent air from entering the fuel flow fields;
wherein the riser and perimeter seals are formed of a seal material comprising, by weight:
SiO2 in an amount ranging from 35% to about 55%;
B2O3 in an amount ranging from about 0.5% to about 15%;
Al2O3 in an amount ranging from about 0.5% to about 5%;
CaO in an amount ranging from about 5% to about 30%;
MgO in an amount ranging from about 2% to about 25%;
La2O3 in an amount ranging from about 2% to about 12%; and
at least 0.5% of at least one of BaO and SrO.