Fuel Cell Moisture Control for Reliable Startup
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Summary
Problems
In proton-exchange membrane fuel cells, accurately estimating and controlling moisture content distribution across the cell plane is challenging due to water transfer between anode and cathode electrodes, leading to issues like high pressure drop and insufficient hydrogen gas supply during startup, caused by residual water.
Innovation solutions
A fuel cell system that includes an estimating unit for residual water content distribution in reactant gas flow channels and moisture content in the electrolyte membrane, considering water transfer between electrodes, and an operation control unit to optimize scavenging time before startup, ensuring accurate water removal and preventing cell voltage drops.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional moisture control techniques are used without considering water transfer between electrodes, then pressure drop and humidity control can be managed, but accuracy of moisture content estimation deteriorates
Why choose this principle:
The patent introduces an estimating unit as an intermediary component that calculates water transfer between anode and cathode electrodes based on operating conditions. This intermediary calculation mechanism enables accurate moisture content estimation without requiring direct measurement of water transfer, thus improving measurement precision while avoiding excessive system complexity.
Principle concept:
If conventional moisture control techniques are used without considering water transfer between electrodes, then pressure drop and humidity control can be managed, but accuracy of moisture content estimation deteriorates
Why choose this principle:
The patent replaces direct physical measurement of moisture content with a computational estimation approach. The estimating unit uses mathematical models and operating condition data to calculate moisture content and water transfer, substituting mechanical measurement systems with information processing, thereby improving estimation accuracy without proportionally increasing device complexity.
Application Domain
Data Source
AI summary:
A fuel cell system that includes an estimating unit for residual water content distribution in reactant gas flow channels and moisture content in the electrolyte membrane, considering water transfer between electrodes, and an operation control unit to optimize scavenging time before startup, ensuring accurate water removal and preventing cell voltage drops.
Abstract
It is an object of the invention to improve the accuracy of estimating a moisture content and suppress an effect of remaining water at the startup of the fuel cell system. A fuel cell system includes: a fuel cell including a cell laminate; an estimating unit for estimating a residual water content distribution in the reactant gas flow channel and a moisture content distribution in the electrolyte membrane in a cell plane of each single cell while taking into consideration water transfer that occurs between the anode electrode and the cathode electrode via the electrolyte membrane; and an operation control unit for, based on an estimation result from the estimating unit, setting a scavenging time used in a scavenging process for the fuel cell after the fuel cell system is shut down.