Fuel Cell Bonding Dies with Segmented Inner Outer Structure
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Solution Overview
Problem
Conventional bonding dies for fuel cells cause the resin frame to float off the membrane electrode assembly during thermal compression bonding, leading to gaps and gas leakage.
Innovation Solution
The bonding dies include a first die with a central and outer periphery receiving portion for one separator and a second die with an inner and outer die to pressurize and thermally compress the other separator, extending to reduce moments acting on the resin frame, ensuring secure bonding and preventing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding dies are used to thermally compress separators to the electrode assembly, then the separators are bonded to the resin frame, but the resin frame floats off the membrane electrode assembly causing gaps and gas leakage
Solution Approach 1:
The second die is divided into an inner die and an outer die that can move independently. The outer die thermally compresses the separator to bond it to the resin frame, while the inner die presses the membrane electrode assembly to prevent the resin frame from floating off. This segmentation allows simultaneous application of different forces to different components, resolving the contradiction between bonding reliability and preventing gas leakage.
2Strength
If thermal compression bonding is applied to bond separators to the electrode assembly, then bonding strength is achieved, but moments act on the resin frame causing it to peel off from the membrane electrode assembly
Solution Approach 1:
The second die is segmented into inner and outer dies that independently control different regions. The outer die provides thermal compression for bonding strength, while the inner die provides counter-pressure to maintain structural stability and prevent peeling. This segmentation allows simultaneous optimization of both bonding strength and structural stability.
Solution Approach 2:
Different regions of the electrode assembly receive different types of pressure: the separator region receives thermal compression pressure for bonding, while the membrane electrode assembly region receives pressing force for stability. This local differentiation of pressure application resolves the contradiction between achieving bonding strength and maintaining structural stability.
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 securely bonds the resin frame to the membrane electrode assembly, preventing floating and gas leakage, thus stabilizing the fuel cell stack quality.
Implementation Method 1
thermally compress a pair of separators that are arranged on opposite faces of the electrode assembly, thereby bonding the pair of separators to the resin frame
Implementation Method 2
the inner die being adapted to pressurize a central region of the other separator that faces and contacts the electrode assembly
Data Source
AI summary
Bonding dies for producing a fuel cell that can suppress floating of a portion of a resin frame bonded to a membrane electrode assembly include first and second dies facing and contacting respective first and second separators. The first die includes a central receiving portion and an outer periphery receiving portion. The second die includes an inner die that pressurizes a central region of the second separator, and an outer die formed to surround the inner die to thermally compress a peripheral region of the second separator. The inner die extends from a portion corresponding to the central region along an open edge in the resin frame, up to a region closer to an outer periphery side of the electrode assembly than a portion of the resin frame bonded to the membrane electrode assembly, so as to pressurize the resin frame via the other separator.