Fuel Cell Intermediate Seal Zone for Hydrogen Leak Containment

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Solution Overview

Problem

Fuel cells with proton-exchange membranes at low temperatures face challenges with imperfect seals, leading to fuel leaks, particularly with dihydrogen, which is difficult to contain due to its low viscosity, and existing solutions are either expensive or technically incompatible for all applications.

Innovation Solution

The design incorporates an intermediate zone between the peripheral and reactive zone seals, with separate flow manifolds and a flow circuit that allows for the detection and recovery of leaked fuel, using a fluid different from the reactive zone fluids, and can be configured to circulate air or coolant to prevent accumulation and reduce ignition risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ventilation devices are added to limit fuel leakage risks, then safety is improved, but device complexity and cost increase

Engineering Contradiction:

ImprovesafetyVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

An intermediate zone is introduced between the reactive zone and the external environment, filled with an inert fluid (nitrogen or carbon dioxide). This intermediary zone acts as a buffer that prevents leaked fuel from directly contacting air, thereby maintaining safety without requiring complex ventilation systems. The inert atmosphere in this zone eliminates the need for active ventilation while still containing and neutralizing fuel leaks.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates an inert atmosphere within the intermediate zone by filling it with nitrogen or carbon dioxide. This inert environment prevents fuel ignition even when leaks occur, as the fuel cannot mix with oxygen. This approach improves safety by eliminating the combustion risk associated with fuel leaks, while avoiding the complexity of ventilation devices that would be needed to actively manage fuel-air mixtures.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Loss of substance

If peripheral seals are used to prevent fuel leakage, then fuel containment is improved, but sealing effectiveness deteriorates due to low viscosity of dihydrogen

Engineering Contradiction:

Improvefuel containmentVSAvoidsealing effectiveness

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The intermediate zone serves as an additional containment barrier between the fuel cell and the external environment. Even when peripheral seals fail to completely prevent dihydrogen leakage due to its low viscosity, the intermediate zone filled with inert gas captures and contains the leaked fuel, preventing it from reaching the external atmosphere. This intermediary zone effectively compensates for seal imperfections.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The intermediate zone is pre-filled with inert gas before operation, creating a protective cushion that is ready to contain any fuel leaks immediately when they occur. This preparatory measure ensures that even small leaks of low-viscosity dihydrogen are captured before they can accumulate or reach ignition sources, enhancing both containment and safety.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Difficulty of detecting and measuring

If detection probes are positioned in intermediate zone manifolds, then leak detection capability is improved, but device complexity and positioning constraints increase

Engineering Contradiction:

Improveleak detection capabilityVSAvoiddevice complexity

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The intermediate zone acts as a collection chamber for leaked fuel, concentrating it in a controlled environment. Detection probes positioned in the intermediate zone manifolds can detect fuel presence more easily because the inert gas environment prevents fuel dispersion and accumulation in hard-to-reach areas. The intermediate zone serves as an intermediary that facilitates easier detection compared to direct monitoring at the seal interfaces.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration effectively contains and recovers leaked fuel, preventing its concentration around the fuel cell and reducing the risk of ignition, making it suitable for various applications beyond experimental use.

Implementation Method 1

a flow circuit is provided in the intermediate zone (57) between the seals (517, 518)

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS11482714B2System including a fuel cell having a protons exchanging membrane limiting fuel leakage

Publication Date: 2022.10.25 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

AI summary

A fuel cell includes a flow guide, a component for allowing a first fluid to flow from a first manifold to a second manifold and through a reactive zone, a peripheral seal disposed between the flow guide and the component, an intermediate seal disposed between the flow guide and the component, the intermediate seal being encircled by the peripheral seal and encircling the reactive zone, another component opposite the flow guide to allow a second fluid to flow from a third manifold to a fourth manifold and through another reactive zone, and a fluid flow circuit provided between the intermediate seal and the peripheral seal between fifth and sixth manifolds. One of the fifth and sixth manifolds is separated from the first to fourth manifolds by the intermediate seal.