Fuel Cell Humidifier Cleaning for Contamination Control

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Solution Overview

Problem

The durability and stability of fuel cell systems are compromised due to internal contamination of the humidifier by foreign substances from the fuel cell stack, leading to degradation of the membrane electrode assembly and separator.

Innovation Solution

A fuel cell system with a humidifier that includes a cleaning substance supply line and discharge line to selectively clean the humidifier, an on-off valve, and a contamination degree measurement sensor to manage cleaning based on internal contamination levels, with cleaning performed in a non-operation mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the humidifier is continuously operated to humidify air using moist air from the fuel cell stack, then the humidification function is maintained, but foreign substances accumulate and contaminate the humidifier and fuel cell stack

Engineering Contradiction:

Improvedurability and stability of fuel cell stackVSAvoidinternal contamination of humidifier

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs cleaning operations periodically rather than continuously. A cleaning water supply line and discharge line are provided to supply cleaning water to the humidifier and discharge it after cleaning, with cleaning performed in non-operation mode when the fuel cell stack is not operating. This periodic cleaning action removes accumulated foreign substances while maintaining continuous humidification during operation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The humidifier cleans itself by using cleaning water supplied through the cleaning water supply line. The cleaning water flows through the humidifier to remove foreign substances and is then discharged through the cleaning water discharge line. This self-cleaning mechanism eliminates the need for manual disassembly and cleaning of the humidifier.

Inventive Principle:

Principle #25Self-service

2Object-affected harmful factors

If cleaning water is supplied to the humidifier to remove foreign substances, then contamination is reduced, but the system complexity increases due to additional lines and valves

Engineering Contradiction:

Improveforeign substance accumulationVSAvoidcleaning water supply line and discharge line

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The cleaning water supply line and discharge line are integrated into the existing humidifier system, allowing the same infrastructure to serve both humidification and cleaning functions. The on-off valve controls fluid flow for both normal operation and cleaning modes, reducing the need for separate dedicated components and minimizing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The on-off valve acts as an intermediary component that controls the flow of cleaning water through the humidifier system. By using a simple valve to regulate fluid flow between the cleaning water supply line, humidifier, and discharge line, the system achieves effective cleaning functionality without requiring complex control mechanisms or multiple specialized components.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Duration of action of stationary object

If the humidifier is cleaned frequently to remove foreign substances, then durability is improved, but operational time is lost due to cleaning interruptions

Engineering Contradiction:

Improvelifespan of humidifier and fuel cell stackVSAvoidcleaning operation time

Core Design Contradiction:

Duration of action of stationary objectVSLoss of time

Solution Approach 1:

The cleaning operation is performed periodically during non-operation modes of the fuel cell stack rather than continuously or frequently during operation. This timing strategy allows the system to maintain the humidifier and fuel cell stack without losing operational time, as cleaning occurs only when the system is already stopped or idle.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The cleaning water is supplied to the humidifier before foreign substances can cause significant damage or contamination buildup. By performing cleaning operations during scheduled non-operation periods, the system proactively maintains component condition without interrupting normal fuel cell operations, thus extending lifespan without operational time loss.

Inventive Principle:

Principle #10Preliminary action

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 system effectively minimizes contamination and damage to the humidifier, enhances the durability and stability of the fuel cell stack, and extends its lifespan by timely removal of foreign substances.

Implementation Method 1

a humidifier configured to humidify, using the moist air discharged from the fuel cell stack, air, which is to be supplied to the fuel cell stack

Methodology Applied

Scientific EffectHumidification: Evaporation

Data Source

PatentUS20260051521A1Fuel cell system

Publication Date: 2026.02.19 HYUNDAI MOTOR CO LTD

AI summary

The present disclosure relates to a fuel cell system including a fuel cell stack, a humidifier configured to humidify air, which is to be supplied to the fuel cell stack, by means of moist air discharged from the fuel cell stack, a cleaning water supply line connected to the humidifier and configured to selectively supply cleaning water to the humidifier, and a cleaning water discharge line connected to the humidifier and configured to discharge the cleaning water to the outside of the humidifier, thereby obtaining an advantageous effect of improving durability and stability.