US 12,407,007 B2
Method for operating a fuel cell system and control device for same
Helerson Kemmer, Vaihingen (DE); Ingo Brauer, Vaihingen (DE); Felix Guenther, Stuttgart (DE); and Michael Schmidt, Weinstadt (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 17/773,133
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Oct. 13, 2020, PCT No. PCT/EP2020/078740
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2021/083660, PCT Pub. Date May 6, 2021.
Claims priority of application No. 10 2019 216 656.3 (DE), filed on Oct. 29, 2019.
Prior Publication US 2024/0186548 A1, Jun. 6, 2024
Int. Cl. H01M 8/04 (2016.01); H01M 8/04082 (2016.01); H01M 8/04089 (2016.01); H01M 8/0444 (2016.01); H01M 8/04746 (2016.01)
CPC H01M 8/04462 (2013.01) [H01M 8/04097 (2013.01); H01M 8/04201 (2013.01); H01M 8/0447 (2013.01); H01M 8/04761 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for operating a fuel cell system (1), the method comprising:
supplying a hydrogen-containing anode gas to a fuel cell (2) via an anode gas path (3),
recycling the hydrogen-containing anode gas exiting from the fuel cell (2) via a recirculation path (4), wherein a flush valve (5) arranged in the recirculation path (4) is opened and the recirculation path (4) is flushed for reduction of a proportion of nitrogen contained in the anode gas, and
providing the hydrogen-containing anode gas to a waste gas turbine (14) arranged in a cathode waste gas path (8) directly connectable to the recirculation path (4) via the flush valve (5) in a flush path (7) or indirectly connectable to the recirculation path (4) via the flush path (7),
wherein a hydrogen content of the hydrogen-containing anode gas is determined with the aid of a sensor (6) and is used as a control variable in controlling the flushing of the recirculation path (4).