Fuel cell system

The fuel cell system addresses drainage inefficiencies by using dual injectors and ejectors with controlled injection modes to efficiently remove stagnant water, ensuring stable power generation and electrode performance.

JP7888856B2Active Publication Date: 2026-07-13HONDA MOTOR CO LTD
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Patent Information

Application Number
JP2025510025
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2023-03-29
Filing Date
2024-02-28
Publication Date
2026-07-13
Estimated Expiration
2044-02-28

AI Technical Summary

Technical Problem

The existing fuel cell systems with a pair of ejectors having different circulation capabilities face challenges in optimizing drainage from the fuel cell, particularly in efficiently removing stagnant water that can cause power generation instability and electrode performance degradation.

Method used

A fuel cell system with a first and second supply unit, each equipped with an injector and an ejector, where the first injector injects fuel gas at a higher rate than the second, and the ejectors have different circulation flow rate ratios, controlled by an ECU to alternate fuel gas injection modes based on power requirements, ensuring efficient drainage of stagnant water.

Benefits of technology

The system effectively discharges stagnant water from the fuel cell stack, maintaining stable power generation and electrode performance by optimizing fuel gas flow rates and injection patterns, enhancing drainage performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

This fuel cell system is provided with: a first supply unit which has a first injector and a first ejector and supplies a fuel gas to a fuel cell via a first supply flow path that is connected to a gas inflow unit; a second supply unit which has a second injector and a second ejector and supplies a fuel gas to the fuel cell via a second supply flow path that is connected to the gas inflow unit; and a control unit which controls the first injector and the second injector. The circulation flow rate ratio of the second ejector is higher than the circulation flow rate ratio of the first ejector. The control unit controls the first injector and the second injector so that when one of the first injector and the second injector injects the fuel gas with a predetermined cycle, the other of the first injector and the second injector injects the fuel gas between the predetermined cycles.
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Citation Information

Patent Citations

  • Fuel cell system

    JP2021103670A

  • Fuel cell system

    JP2021118047A