Non-Parallel Fuel Cell Gas Flow Channels for Water Management

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Solution Overview

Problem

Fuel cells face challenges with water management, including flooding, blockage, and purging issues under freezing conditions, as well as pressure management and ease of manifolding, due to parallel gas flow configurations.

Innovation Solution

A non-parallel gas flow configuration is implemented, where channels between the anode and cathode are oriented in a non-parallel configuration, with gravitational assistance for water removal, varying lengths, and intrusion regions to enhance water management and pressure drop reduction, simplifying manifolding and coolant channel integration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If parallel gas flow configuration is used, then ease of manifolding is improved, but water management deteriorates (flooding, blockage, purging issues)

Engineering Contradiction:

Improveease of manifoldingVSAvoidwater management

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies asymmetry by transitioning from a parallel gas flow configuration to a non-parallel configuration where channels are offset and oriented at angles relative to each other. This asymmetric arrangement prevents water accumulation and flooding in the catalyst region while maintaining manufacturability through standardized channel geometries and systematic spacing patterns.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent introduces a new spatial dimension by arranging channels in a non-parallel, three-dimensional configuration rather than simple parallel planes. The channels are offset in both position and orientation, creating a more complex spatial arrangement that enhances water removal pathways and prevents blockage while still allowing for practical manufacturing.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If non-parallel gas flow configuration is used, then water management is improved (reduced flooding, blockage), but device complexity increases

Engineering Contradiction:

Improvewater managementVSAvoidchannel configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the channel system into distinct, modular sections with standardized geometries. Each channel segment follows consistent design rules with uniform spacing and orientation patterns, which simplifies manufacturing despite the overall non-parallel configuration. The segmented approach allows for systematic assembly and maintenance while achieving superior water management.

Inventive Principle:

Principle #1Segmentation

3Productivity

If channels are oriented for gravitationally assisted water removal, then water removal efficiency is improved, but pressure drop increases

Engineering Contradiction:

Improvewater removal efficiencyVSAvoidpressure drop

Core Design Contradiction:

ProductivityVSStress or pressure

Solution Approach 1:

The patent applies local quality by optimizing channel orientation and spacing in different regions of the fuel cell. Channels are strategically positioned and angled to provide gravitationally assisted water removal in areas where water accumulation is most problematic, while maintaining shorter flow paths and more direct configurations in regions where pressure drop is a greater concern. This localized optimization balances water removal efficiency with pressure management.

Inventive Principle:

Principle #3Local quality

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

The non-parallel gas flow configuration effectively minimizes flooding, reduces pressure drop, and simplifies manifolding, improving the efficiency and reliability of fuel cells, especially under cold start conditions, by facilitating better water removal and gas transport.

Implementation Method 1

at least one of: at least one of the first set of channels or the second set of channels are oriented to provide gravitationally assisted water removal

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS11038181B2Fuel cells with a non-parallel gas flow channel configuration and methods thereof

Publication Date: 2021.06.15 ROCHESTER INSTITUTE OF TECHNOLOGY

AI summary

A fuel cell apparatus including a fuel cell comprising a membrane electrode assembly between an anode and a cathode, a first set of channels between the anode and the assembly, and a second set of channels between the cathode and the assembly. The first set of channels is spaced from and extends across a width of the second set of channels in a non-parallel configuration and at least one of the first or second set of channels are oriented to provide gravitationally assisted water removal; at least one of the first set or second set of channels has a shorter length than the other one of the first set and second set of channels; or at least one of the first set or second set of channels has intrusion regions that extend portions of the assembly into at least one of the first set or second set of channels.