Fuel Cell Electrode Isolation for Membrane Leak Detection
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Solution Overview
Problem
Fuel battery cells with openings are vulnerable to residual and thermal stress, leading to potential electrolyte membrane destruction, gas leakage, and reduced power generation output due to gas mixing and electrode contact.
Innovation Solution
The fuel battery cell design includes a first and second electrode laminated on a support substrate with an insulating member electrically separating at least one of them, forming distinct regions to detect electrolyte membrane destruction without overlapping with the substrate opening, allowing for built-in leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an electrolyte membrane is made thin to compensate for low conductivity, then energy efficiency is improved, but the membrane becomes more vulnerable to destruction from stress and pressure differences
Solution Approach 1:
The patent applies beforehand cushioning by introducing a buffer layer between the electrolyte membrane and the opening of the support substrate. This buffer layer absorbs and cushions the stress and pressure differences that would otherwise directly affect the thin electrolyte membrane, preventing its destruction while maintaining the thin-film configuration for energy efficiency.
2Ease of manufacture
If a through window is formed in the support substrate to enable electrode lamination, then manufacturing capability is improved, but the electrolyte membrane becomes exposed and vulnerable to destruction
Solution Approach 1:
The buffer layer is positioned between the electrolyte membrane and the opening in the support substrate, providing beforehand cushioning against stress and pressure. This allows the through-window configuration for ease of manufacture to be maintained while protecting the electrolyte membrane from destruction.
3Measurement precision
If the electrolyte membrane is destroyed, then gas leakage occurs and power generation output decreases, but detecting the destruction requires complex external sensing equipment
Solution Approach 1:
The patent merges the leak detection function with the existing electrode structure by using the electrode as both a current-collecting component and a leak-detection sensor. The electrode monitors for gas leakage by detecting changes in its electrical properties, eliminating the need for separate external sensing equipment and reducing device complexity while maintaining detection precision.
Solution Approach 2:
The electrode is given dual functionality: it serves as both a current-collecting electrode for power generation and as a sensor for detecting electrolyte membrane destruction and gas leakage. This multi-functionality reduces the overall system complexity by eliminating dedicated external detection equipment.
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 enables simple and efficient detection of electrolyte membrane destruction, reducing the need for external leak detection tools, minimizing energy consumption, and facilitating the integration of sensing units within the fuel battery cell, thereby enhancing reliability and power generation efficiency.
Implementation Method 1
a solid electrolyte is sandwiched between a fuel electrode and an air electrode
Implementation Method 2
a fuel battery cell uses the electrolyte as a partition wall, supplies a fuel gas such as hydrogen to the fuel electrode side and supplies air or an oxygen gas to the oxygen station side
Data Source
AI summary
The present invention aims to provide a fuel battery system improved in reliability by accurately detecting when a fuel electrode gas or an air electrode gas has leaked. A fuel battery cell according to the present invention includes a first electrode, an electrolyte membrane, and a second electrode which are layered on a support substrate. Further, at least any one of the first electrode, the electrolyte membrane, and the second electrode is electrically isolated by an insulating member to form a first region and a second region. The insulating member is disposed at a position where the insulating member does not overlap with an opening portion of the support substrate (refer to FIG. 3).