公开(公告)号：US11742503B2

公开(公告)日：2023-08-29

申请号：US17291155

申请日：2019-11-06

Applicant: BALLARD POWER SYSTEMS INC.

Inventor： Emerson R. Gallagher ,  Alan Young ,  Yingduo Chen

IPC: H01M8/04746 ,  H01M8/04302 ,  H01M8/04303 ,  H01M8/04537 ,  H01M8/04664 ,  H01M8/04955

CPC classification number: H01M8/04753 ,  H01M8/04302 ,  H01M8/04303 ,  H01M8/04559 ,  H01M8/04589 ,  H01M8/04679 ,  H01M8/04776 ,  H01M8/04955

Abstract: A method is provided for operating a fuel cell stack with improved performance recovery from sub-saturated conditions, the method comprising setting an alert for the performance recovery of the fuel cell stack, performing at least one oxidant starvation by supplying oxidant at a stoichiometric ratio below 1 to the fuel cell stack in at least one pulse for a preset amount of time and at low current while the fuel cell stack does not generate power. The fuel cell system with an improved performance recovery comprises a shorting circuit which is connected to the fuel cell stack at predetermined times (startup, shutdown or standby mode) and an air compressor powered by a DC-DC converter which supplies a predetermined number of oxidant pulses of a predetermined duration to the fuel cell stack.