US 12,460,653 B2
Method for operating a multi-stage air compression system, multi-stage air compression system, and fuel cell system
Helerson Kemmer, Vaihingen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 18/855,473
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Mar. 6, 2023, PCT No. PCT/EP2023/055599
§ 371(c)(1), (2) Date Oct. 9, 2024,
PCT Pub. No. WO2023/208459, PCT Pub. Date Nov. 2, 2023.
Claims priority of application No. 10 2022 204 160.7 (DE), filed on Apr. 28, 2022.
Prior Publication US 2025/0237220 A1, Jul. 24, 2025
Int. Cl. F04D 25/06 (2006.01); F04D 27/02 (2006.01); H01M 8/04111 (2016.01)
CPC F04D 25/06 (2013.01) [F04D 27/0215 (2013.01); F04D 27/0253 (2013.01); H01M 8/04111 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of operating a multi-stage air compression system (1) comprising an electrically driven first compressor (1.1) and a second compressor (1.2) driven by a turbine (2), wherein the compressors (1.1, 1.2) are arranged in a supply air path (3) and the turbine (2) is arranged in an exhaust air path (4) of an air system for supplying air to a fuel cell stack (5),
wherein, when the air compression system (1) is started, air compressed by the first compressor (1.1) is supplied to the fuel cell stack (5) via a bypass (6) to bypass the second compressor (1.2) and the second compressor (1.2) is connected to surrounding environment on both inlet and outlet sides via at least one valve (7, 8) and/or a throttle valve (9).