Diaphragm-Electrode Seal Integration for Roll-to-Roll Fuel Cell Stacks
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Solution Overview
Problem
Current methods for manufacturing fuel cell stacks, particularly for electric vehicle applications, face challenges in achieving mass production efficiency due to time-consuming elastomer seal application and difficulties in recycling and separating individual components.
Innovation Solution
A method involving a band-shaped diaphragm-electrode arrangement made of electrode and layer materials, processed through injection molding to create a seal, allowing for efficient roll-to-roll manufacturing and integration of a duct system within the injection molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomer seals are applied manually to bipolar plates, then sealing reliability is improved, but manufacturing time and labor costs increase significantly
Solution Approach 1:
The patent replaces manual mechanical seal application with an injection molding process that automatically embeds seals into the bipolar plates during manufacturing. This substitution of manual operations with automated molding technology simultaneously achieves reliable sealing and high-volume production capability.
Solution Approach 2:
The patent combines the seal application process with the bipolar plate manufacturing process by embedding seals directly into the plate structure during injection molding. This merging of previously separate operations (plate fabrication and seal installation) into a single integrated process eliminates manual labor while ensuring consistent seal placement.
2Adaptability or versatility
If individual fuel cell stack components are adhesively bonded, then assembly flexibility is improved, but component recycling and separation become extremely difficult
Solution Approach 1:
The patent designs the bipolar plate with integrated seal structures that can be cleanly separated during recycling. The injection molded seal creates distinct functional zones that allow for easy disassembly and component recovery, enabling both flexible assembly and efficient recycling through segmented design.
Solution Approach 2:
The patent facilitates component recovery by designing the integrated seal structure to enable clean separation of bipolar plates and seals during recycling processes. The injection molding creates bonds that are strong during operation but allow for controlled separation and material recovery at end-of-life.
3Adaptability or versatility
If discrete seal application methods are used, then seal placement flexibility is improved, but manufacturing complexity and time consumption increase
Solution Approach 1:
The patent merges seal placement flexibility with manufacturing simplicity by integrating the seal directly into the bipolar plate mold cavity. This allows the seal to be positioned precisely where needed while eliminating separate seal application equipment, fixtures, and manual operations, thereby reducing overall manufacturing complexity.
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 enables efficient mass production of diaphragm-electrode arrangements with integrated seals, reducing manual operations, and allowing for automated process control, while also simplifying the creation of gas-conveying duct systems, thus improving handling and cost-effectiveness.
Implementation Method 1
connecting the electrode material to the at least one layer material by an injection molding process; filling up cavities and edge areas in the at least one layer material in the injection molding process using injection molding material to create a seal
Data Source
AI summary
A method for manufacturing a diaphragm-electrode arrangement including seal from at least one layer material and an electrode material. A diaphragm-electrode arrangement made of an electrode material and at least one layer material is provided either from a common roll store or as a layer assemblage from individual rolls. The electrode material is connected to the at least one layer material by an injection molding process. Cavities and edge areas in the at least one layer material are filled up by the injection molding material and form a seal of the band-shaped diaphragm-electrode arrangement. The injection molding material, in particular TPE, is used in the following stacking process as a seal between the electrodes.