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.

公开(公告)号：US11239471B2

公开(公告)日：2022-02-01

申请号：US16336462

申请日：2017-09-29

Applicant: Ballard Power Systems Inc.

Inventor： Siyu Ye ,  Alexander Man-Chung Leung ,  Kyoung Bai ,  Dustin William H. Banham ,  Alan Young

IPC: H01M4/86 ,  H01M8/1004 ,  H01M4/88 ,  H01M4/90 ,  C08F214/26

Abstract: A membrane electrode assembly including: an anode electrode; a cathode electrode; and a polymer electrolyte membrane; wherein the cathode includes a first cathode catalyst sublayer including a first precious metal catalyst composition and a first ionomer composition including a first ionomer and a second ionomer; and a second cathode catalyst sublayer including a second precious metal catalyst composition and a second ionomer composition including a third ionomer; wherein the first ionomer is different from the second ionomer in at least one of chemical structure and equivalent weight.

公开(公告)号：US11355759B2

公开(公告)日：2022-06-07

申请号：US16604537

申请日：2018-04-13

Applicant: Ballard Power Systems Inc.

Inventor： Rajesh Bashyam ,  Alan Young

IPC: H01M4/92 ,  H01M4/86 ,  H01M4/88 ,  H01M8/1004 ,  H01M8/1023 ,  H01M8/1039 ,  H01M8/1044 ,  H01M8/10

Abstract: A membrane electrode assembly comprises an anode electrode comprising an anode catalyst layer; a cathode electrode comprising a cathode catalyst layer; and a polymer electrolyte membrane interposed between the anode electrode and the cathode electrode; wherein at least one of the anode and cathode catalyst layers comprises a block co-polymer comprising poly(ethylene oxide) and poly(propylene oxide).