Fuel Cell Bonding Device with Vacuum Suction and Edge Heating
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Solution Overview
Problem
Conventional methods for bonding gas diffusion layers to membrane-electrode assemblies in fuel cells often result in distorted bonding positions and performance deterioration due to water evaporation and shrinkage, leading to leaks and compromised ion conduction.
Innovation Solution
A device with vacuum suction holes and movable dies and hot presses is used to maintain precise loading positions and apply thermal compression uniformly, preventing water evaporation and deformation, while using heating members to minimize heat exposure to the MEA matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hot press device compresses the gas diffusion layer and MEA matrix under high temperature and pressure, then bonding strength is improved, but the gas diffusion layer may roll up and distort the bonding position
Solution Approach 1:
The gas diffusion layer is preliminarily fixed to the MEA matrix at predetermined positions before the compression bonding process. This preliminary fixation prevents the gas diffusion layer from rolling up or shifting during the high-temperature high-pressure compression, ensuring accurate bonding positions while still achieving strong bonding
2Strength
If the MEA matrix is exposed to high temperature during hot press bonding, then bonding is achieved, but water evaporates causing shrinkage and wrinkle formation
Solution Approach 1:
Heating members are positioned only at the edge regions of the MEA matrix rather than covering the entire surface. This localized heating approach provides sufficient heat for bonding at the edges while minimizing heat exposure to the central region, preventing water evaporation, shrinkage, and wrinkle formation in the MEA matrix
3Productivity
If high temperature is applied during bonding, then bonding efficiency is improved, but ion conduction performance deteriorates due to water evaporation
Solution Approach 1:
The heating members are configured to heat only the edge regions of the MEA matrix, maintaining sufficient temperature for effective bonding while preserving the water content and ion conduction performance in the central region where the membrane-electrode assembly functions
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 approach ensures accurate bonding of gas diffusion layers to both sides of the MEA, preventing distortion and maintaining ion conduction performance, thus enhancing the reliability and efficiency of fuel cell manufacturing.
Implementation Method 1
a lower die (10) which forms vacuum suction holes (11) on an upper surface
Implementation Method 2
a lower hot press (30)... an upper hot press (90)... bonding the MEA matrix and the upper side of the gas diffusion layer at high-temperature/high-pressure
Data Source
AI summary
A device for bonding fuel cell parts may include a die, which forms vacuum suction holes, a lower hot press, respectively installed on both edges of a lower die to be movable in a vertical direction an upper die, installed to be movable in a vertical direction from the upper side of the lower die, a vacuum attachment member, which constitutes the same plane with the lower surface of the upper die, forms vacuum suction holes on the lower surface, and is installed on the upper die to be movable in a vertical direction while corresponding to the upper surface of the lower die between the lower hot press, and an upper hot press, respectively installed between both edges of the upper die to be movable in a vertical direction while corresponding to the lower hot press and constituting the same plane with the lower surface of the upper die.