Polymer Electrolyte Membrane Preassembly for Fuel Cell Stacking
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Solution Overview
Problem
The assembly of proton exchange membrane fuel cells is challenging due to the sensitivity of polymer electrolyte membranes to humidity variations, which can cause contraction and make handling and centering difficult, especially when combining reinforcement membranes with the polymer electrolyte membrane.
Innovation Solution
A method involving preassembling the polymer electrolyte membrane under specific temperature and humidity conditions, followed by transferring it to a support under different conditions where it can expand, ensuring the membrane does not contract, and using laser welding to secure the membranes while cutting the polymer electrolyte membrane to fit within the reinforcing membranes, maintaining flatness and facilitating stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the polymer electrolyte membrane is preassembled with the reinforcing membrane under standard temperature conditions, then the membrane is easy to handle and center, but the membrane contracts due to humidity variations causing assembly difficulties
Solution Approach 1:
The patent applies parameter changes by controlling temperature and humidity conditions during the preassembly process. Specifically, the membrane is preassembled at elevated temperature (e.g., 50-70°C) and controlled humidity (e.g., 30-50% RH) to prevent contraction, then cooled to operating temperature after assembly. This temperature parameter change ensures the membrane maintains its dimensions during handling while avoiding contraction issues that would occur at standard temperatures.
Solution Approach 2:
The patent implements preliminary action by performing the preassembly operation under controlled temperature and humidity conditions before the final assembly. The membrane is pre-assembled with the reinforcing membrane at elevated temperature to establish a stable configuration, then the entire assembly is cooled to operating temperature. This preliminary action at controlled parameters prevents contraction during the assembly process itself.
2Shape
If the polymer electrolyte membrane is heated to prevent contraction, then the membrane maintains its shape for easy handling, but additional temperature control equipment is required
Solution Approach 1:
The patent uses an intermediary approach by introducing a controlled atmosphere environment (temperature and humidity chamber) as a mediator between the membrane and the surrounding environment. Rather than directly heating the membrane during assembly, the entire assembly process occurs within a controlled atmosphere chamber that maintains elevated temperature and controlled humidity, allowing the membrane to maintain its shape without direct thermal intervention during handling.
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 ensures the polymer electrolyte membrane does not induce stress on the reinforcing membranes, maintaining their flatness and ease of handling, thereby simplifying the assembly process and ensuring proper stacking of layers in fuel cell manufacturing.
Implementation Method 1
the polymer electrolyte membrane undergoes expansion with respect to its state under the first conditions of temperature and humidity
Implementation Method 2
the polymer electrolyte membrane is very sensitive to humidity variations resulting from temperature variations
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for producing a polymer electrolyte membrane/electrode assembly for a fuel cell, consisting in assembling a reinforcing membrane with a polymer electrolyte membrane at a temperature above a subsequent handling temperature of the assembly thus formed.