Methods for operating a fuel cell system and fuel cell system

By diverting excess cathode gas through bypass lines and regulating flow with mass flow control devices, the humidifier's service life is extended and stress is minimized, addressing the issue of high mass flow rates in fuel cell systems.

DE102024212005A1Pending Publication Date: 2026-06-18ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
ROBERT BOSCH GMBH
Filing Date
2024-12-16
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Fuel cell systems face challenges in managing high mass flow rates of cathode gas, which can lead to increased stress and reduced service life of the humidifier due to internal leakage and overload.

Method used

Implementing a bypass line in the cathode outlet and utilizing mass flow control devices to divert excess cathode gas, with characteristic values set as maximum permissible mass flow rates or pressure differences, to regulate and limit the cathode gas flow through the humidifier.

Benefits of technology

This approach reduces the load on the humidifier, minimizing the risk of internal leakage and extending its service life by optimizing the cathode gas flow, ensuring precise control and reducing stress on the membrane.

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Abstract

Method for operating a fuel cell system (100) with at least one fuel cell stack (11) and a cathode system (300) in which a cathode supply line (31), a cathode outlet (32) and a humidifier (37) are arranged, wherein the humidifier (37) is connected to the cathode supply line (31) and the cathode outlet (32) in a fluid-permeable manner, wherein at least one means for controlling the mass flow (33, 34) is configured to divert at least a proportionate amount of the mass flow of cathode gas to the humidifier (37) when a characteristic value of the humidifier (37) is exceeded.
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