PEM Fuel Cell Membrane Water Modeling for Electro-Osmotic Drag

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Solution Overview

Problem

Existing simulation models for proton exchange membrane fuel cells (PEMFCs) inaccurately address the electro-osmotic drag effect, leading to unreliable water conservation processes and affecting the overall performance and reliability of the fuel cell.

Innovation Solution

A discretization modeling method is introduced to accurately model the electro-osmotic drag effect by considering both the water conservation portion caused by membrane water content gradient and proton transport flux gradient, using specific calculation expressions and conservation equations to establish a discretization simulation model.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If simplified methods are used to calculate the electro-osmotic drag effect by ignoring the complete effect, then the calculation process is simplified, but the accuracy of water conservation solution deteriorates

Engineering Contradiction:

Improvecalculation process complexityVSAvoidwater conservation calculation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent segments the electro-osmotic drag effect into two distinct parts: the water conservation portion caused by membrane water content gradient and the water conservation portion caused by proton transport flux gradient. This segmentation allows each component to be discretized and calculated separately using finite difference methods, improving accuracy while maintaining computational tractability through systematic breakdown of the complex effect

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If test methods are used to measure the electro-osmotic drag effect, then direct measurement is obtained, but measurement of operating state effect is impossible

Engineering Contradiction:

Improveelectro-osmotic drag effect measurementVSAvoidmeasurement applicability to operating state

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent replaces physical test measurement methods with a numerical simulation system based on finite difference discretization. This substitution enables the measurement and analysis of electro-osmotic drag effect under actual operating conditions where traditional test methods fail, while maintaining quantitative accuracy through mathematical modeling of the conservation equations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If numerical simulation method is used to characterize the electro-osmotic drag effect, then operating state measurement is enabled, but reliability deteriorates due to simplified calculations

Engineering Contradiction:

Improvesimulation applicability to operating stateVSAvoidsimulation model reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent enhances simulation reliability by segmenting the electro-osmotic drag effect into two calculable components and applying finite difference discretization to each. This systematic segmentation and numerical treatment maintains fidelity to the complete physical effect while enabling practical computation under operating conditions, thereby improving reliability over simplified simulation approaches

Inventive Principle:

Principle #1Segmentation

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 method improves the accuracy of water conservation simulations in PEMFCs, enhancing the reliability of the simulation technology and reducing experimental costs and product development cycles.

Implementation Method 1

A Proton Exchange Membrane Fuel Cell (PEMFC) is a device that converts chemical energy into electrical energy through electrochemical reaction

Methodology Applied

Scientific EffectElectrochemical reaction:

Implementation Method 2

a certain number of water molecules are carried when the protons are transported from the anode to the cathode, a transport mechanism known as the electro-osmotic drag effect

Methodology Applied

Scientific EffectElectro-osmotic drag effect: Electro-Osmosis

Implementation Method 3

Protons can move directly in the proton exchange membrane while electrons can only move through external circuits

Methodology Applied

Scientific EffectProton conduction: Conduction (electrical)

Data Source

PatentUS12614743B2Discretization modeling method for electro-osmotic drag effect of water conservation in a fuel cell

Publication Date: 2026.04.28 CATARC NEW ENERGY VEHICLE TEST CENT (TIANJIN) CO LTD

AI summary

The present disclosure provides a discretization modeling method for electro-osmotic drag effect of water conservation in a fuel cell, comprising: establishing a conservation equation of membrane water in the fuel cell, performing a discretization for a complete electro-osmotic drag effect, obtaining a discretization simulation model of the complete electro-osmotic drag effect based on results of the discretization, solving the conservation equation of membrane water to establish a discretization simulation model of electro-osmotic drag effect of water conservation in the fuel cell. The discretization modeling method for the electro-osmotic drag effect of water conservation in a fuel cell in the present disclosure can perform a discretization and a numerical calculation for a complete electro-osmotic drag effect, the discretization comprising a water conservation portion caused by a membrane water content gradient and a water conservation portion caused by a proton transport flux gradient.