US 11,843,140 B2
Fuel cell system and method for removing water from the fuel cell system
Alexander Schnabel, Graz (AT)
Assigned to AVL List GmbH, Graz (AT)
Appl. No. 17/608,166
Filed by AVL List GmbH, Graz (AT)
PCT Filed May 8, 2020, PCT No. PCT/AT2020/060188
§ 371(c)(1), (2) Date Nov. 2, 2021,
PCT Pub. No. WO2020/223754, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. A 50417/2019 (AT), filed on May 9, 2019.
Prior Publication US 2022/0320537 A1, Oct. 6, 2022
Int. Cl. H01M 8/04119 (2016.01); H01M 8/043 (2016.01); H01M 8/04223 (2016.01); H01M 8/04746 (2016.01); H01M 8/04828 (2016.01)
CPC H01M 8/04179 (2013.01) [H01M 8/043 (2016.02); H01M 8/04253 (2013.01); H01M 8/04761 (2013.01); H01M 8/04843 (2013.01)] 10 Claims
OG exemplary drawing
 
1. The method for removing water from a fuel cell system comprising a fuel cell stack having an anode portion and a cathode portion, a purge valve downstream of the anode portion for controlling a purge pressure in the anode portion, and a back pressure valve downstream of the cathode portion for controlling a back pressure in the cathode portion, comprising the steps:
a) increasing the purge pressure in the anode portion to a predefined purge pressure setpoint (AP1) with the purge valve closed,
b) increasing the back pressure in the cathode portion to a predefined back pressure setpoint (KP1) with the back pressure valve closed, and subsequently
c) reducing the increased purge pressure as well as the increased back pressure in pulses by opening the purge valve and the back pressure valve;
wherein the fuel cell system is operated in an electricity-generating mode for generating electricity;
wherein the fuel cell system is operated at a low load point in a purging and drying mode for purging and drying the fuel cell stack, wherein the steps a), b) and c) are carried out during the purging and drying model.