Dome-Ended High-Pressure Electrolyzer Assembly for Reduced Sealing Complexity

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Solution Overview

Problem

Conventional high-pressure electrolyzers are bulky and heavy due to the need for robust sealing between electrolyzer cell stacks and atmospheric pressure, which complicates their design and increases weight.

Innovation Solution

A high-pressure electrolyzer assembly featuring a pressure vessel with dome-shaped ends, pressurized using an inert gas, allowing for a lightweight and efficient design by minimizing pressure differences between the electrolyzer interior and the encapsulated atmosphere, thus eliminating the need for complex sealing and reducing the overall weight and size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If robust sealing is used between electrolyzer cell stacks and atmospheric pressure, then leakage prevention is improved, but device complexity and weight increase

Engineering Contradiction:

Improveleakage preventionVSAvoidsealing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of sealing the electrolyzer against atmospheric pressure from the outside, the invention inverts the approach by placing the electrolyzer inside a pressure vessel that is sealed against the atmosphere. The electrolyzer operates in a pressurized environment (30-700 bar) while the pressure vessel provides the seal against atmospheric pressure, eliminating complex seals on the electrolyzer itself.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The pressure vessel acts as an intermediary between the high-pressure electrolyzer interior and the atmospheric exterior. It provides the sealing function that would otherwise require complex mechanisms on the electrolyzer, while also providing structural strength to contain the high pressure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stress or pressure

If robust sealing structures are used to contain high pressure, then pressure containment is improved, but weight increases

Engineering Contradiction:

Improvepressure containmentVSAvoidelectrolyzer weight

Core Design Contradiction:

Stress or pressureVSWeight of moving object

Solution Approach 1:

The invention inverts the traditional approach by placing the electrolyzer inside a pressure vessel rather than having the electrolyzer itself contain the pressure. This allows the electrolyzer to be lighter since it doesn't need to provide its own pressure containment structure.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The pressure vessel can be constructed using composite materials that provide high strength-to-weight ratio, enabling containment of 30-700 bar pressure while minimizing the added weight. The vessel walls can be optimized for strength while remaining lightweight.

Inventive Principle:

Principle #40Composite materials

3Reliability

If thick sealing material is used in conventional electrolyzers, then sealing reliability is improved, but productivity per volume decreases

Engineering Contradiction:

Improvesealing reliabilityVSAvoidproductivity per volume

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

By inverting the sealing approach and using a pressure vessel to contain the electrolyzer, the invention eliminates the need for thick sealing material around the electrolyzer cells. This increases the active electrolyzer volume relative to the total device volume, improving productivity per volume.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The pressure vessel can use thin-walled structures that are sufficient for pressure containment, replacing the need for thick sealing materials. This allows more of the device volume to be dedicated to productive electrolyzer components rather than sealing structures.

Inventive Principle:

Principle #30Flexible shells and thin films

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 dome-shaped ends provide structural strength, enabling a thinner and lighter electrolyzer assembly that is more productive and compact, while utilizing a process gas to pressurize the vessel, reducing the need for additional compressors and simplifying the structure.

Implementation Method 1

The dome-shaped ends of the pressure vessel provide a high structural strength due to its dome shape

Methodology Applied

Scientific EffectDome shape structural strength: Geometry

Implementation Method 2

The pressure vessel is pressurized using an inert gas or a process gas of the electrolyzer

Methodology Applied

Scientific EffectGas pressurization: Pressurisation

Data Source

PatentUS12428739B2High-pressure electrolyzer assembly and vehicle with an electrolyzer assembly

Publication Date: 2025.09.30 AIRBUS DEFENCE & SPACE GMBH

AI summary

A high-pressure electrolyzer assembly includes a pressure vessel having two dome-shaped ends, and an electrolyzer arranged inside the pressure vessel. The pressure vessel is pressurized using an inert gas or a process gas of the electrolyzer. A vehicle may include at least one such electrolyzer assembly.