Open-Cathode Fuel Cell Humidification Using Hollow Fiber Membranes
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Solution Overview
Problem
Conventional open-cathode-type fuel cell systems lack a humidifier, leading to the introduction of dry external air into the fuel cell stack, which can cause the electrolyte membrane to dry out and fail to function properly.
Innovation Solution
An open-cathode-type fuel cell system is configured with a humidifying structure that extracts moisture from unreacted hydrogen discharged from the fuel cell stack and transfers it to the air flowing into the fuel cell stack, using hollow fiber membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional open-cathode-type fuel cell system is used without a humidifier, then the system structure is simple and manufacturing cost is low, but the electrolyte membrane dries out and performance deteriorates
Solution Approach 1:
The fuel cell system uses its own unreacted hydrogen discharge as the moisture source for humidifying the inlet air, eliminating the need for external humidifiers. The hollow fiber membrane module enables the system to self-regulate humidity by transferring moisture from the hydrogen discharge to the inlet air stream, maintaining electrolyte membrane performance while keeping the system simple.
Solution Approach 2:
The hollow fiber membrane module serves multiple functions simultaneously: it acts as a moisture transfer medium, a filter for removing foreign substances from inlet air, and a structural component of the air supply system. This multi-functionality resolves the contradiction by providing humidification and filtration without adding complex dedicated subsystems.
2Ease of operation
If dry external air is introduced directly into the fuel cell stack, then the system operation is simple, but the electrolyte membrane is completely dried and fails to work properly
Solution Approach 1:
The hollow fiber membrane module acts as an intermediary between the unreacted hydrogen discharge and the inlet air stream. It facilitates passive moisture transfer through the membrane walls without requiring active pumping or complex control mechanisms, thus maintaining ease of operation while ensuring proper humidification for electrolyte membrane functionality.
3Reliability
If a humidifier is added to the fuel cell system, then the electrolyte membrane performance is maintained, but the system structure becomes complex and manufacturing cost increases
Solution Approach 1:
The humidification function is merged with the existing air supply and hydrogen discharge systems. The hollow fiber membrane module is integrated into the air inlet path and connected to the hydrogen discharge line, combining humidification, filtration, and air supply functions into a single integrated structure that does not require separate humidifier equipment.
4Device complexity
If the fuel cell system operates without moisture recovery from unreacted hydrogen, then the system structure is simple, but moisture is wasted and electrolyte membrane dries out
Solution Approach 1:
Instead of discarding the unreacted hydrogen discharge, the system recovers the moisture contained within it by transferring water vapor through the hollow fiber membrane to the inlet air. This recovery process prevents moisture loss and eliminates the need for external humidification sources, resolving the contradiction between system simplicity and substance conservation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution improves the performance of the fuel cell stack by maintaining the ion conductivity of the electrolyte membrane, while also filtering external foreign substances and simplifying the system structure, making it easier to manufacture and assemble.
Implementation Method 1
a humidifying structure disposed on one side of the fuel cell stack in order to transfer moisture included in unreacted hydrogen, discharged from the fuel cell stack, to air flowing into the fuel cell stack
Data Source
AI summary
An open-cathode-type fuel cell system includes hollow fiber membranes, through which moisture contained in unreacted hydrogen discharged from a fuel cell stack is transferred to air flowing into the fuel cell stack, and an aerial vehicle using the same. The open-cathode-type fuel cell system includes a fuel cell stack configured to generate electricity through a reverse electrolysis reaction using hydrogen and air supplied from the outside, a humidifying structure disposed on one side of the fuel cell stack in order to transfer moisture included in unreacted hydrogen, discharged from the fuel cell stack, to air flowing into the fuel cell stack, and a cooling fan disposed on the other side of the fuel cell stack in order to discharge unreacted air, discharged from the fuel cell stack, and cooling air to the outside. Accordingly, the performance of the air-cooled fuel cell system may be improved.