Fuel Cell Electrolyte Membrane Laser Welding
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Solution Overview
Problem
In fuel cell manufacturing, the stress concentration on the electrode sheet, particularly the electrolyte membrane, due to the thickness variation between the support frame and the gas diffusion layers leads to potential damage, and traditional thermal compression bonding methods struggle to adequately weld the joining material within the support frame's opening.
Innovation Solution
A manufacturing method involving laser irradiation processes to selectively melt and weld a thermoplastic resin joining material both between the support frame and the electrode sheet and within the support frame's opening, ensuring a robust bond and reinforcing the electrolyte membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thermal compression bonding is used to join the support frame to the electrode sheet, then the joining process is simple, but the joining material within the opening cannot be sufficiently welded to the electrode sheet
Solution Approach 1:
The patent replaces the mechanical thermal compression bonding system with a laser beam irradiation system. The laser beam directly irradiates the joining material within the opening to melt and weld it to the electrode sheet, achieving sufficient welding quality without relying on mechanical pressure transmission through the support frame.
Solution Approach 2:
The patent introduces the laser beam as an intermediary energy carrier between the support frame assembly and the joining material. The laser beam selectively heats and melts the joining material within the opening, enabling precise welding without direct mechanical contact or pressure application.
2Strength
If the joining material is extended within the opening of the support frame to reinforce the electrode sheet, then stress concentration on the electrode sheet is reduced, but the joining material cannot be adequately welded by traditional thermal compression bonding
Solution Approach 1:
The patent replaces the mechanical thermal compression bonding system with a laser beam irradiation system. The laser beam directly irradiates the joining material within the opening to melt and weld it to the electrode sheet, achieving sufficient welding quality without relying on mechanical pressure transmission through the support frame.
Solution Approach 2:
The patent applies local quality by using laser beam irradiation to selectively weld only the joining material within the opening to the electrode sheet, while the support frame itself remains unwelded to the electrode sheet. This localized welding approach enables precise reinforcement where needed without requiring extensive welding of the entire assembly.
3Ease of manufacture
If the support frame is joined to the electrode sheet via thermal compression bonding, then the joining process is straightforward, but stress concentrates on the electrode sheet at the space between the opening and gas diffusion layer
Solution Approach 1:
The patent applies local quality by using laser beam irradiation to selectively weld only the joining material within the opening to the electrode sheet, while the support frame itself remains unwelded to the electrode sheet. This localized welding approach enables precise reinforcement where needed without requiring extensive welding of the entire assembly.
Solution Approach 2:
The patent replaces the mechanical thermal compression bonding system with a laser beam irradiation system. The laser beam directly irradiates the joining material within the opening to melt and weld it to the electrode sheet, achieving sufficient welding quality without relying on mechanical pressure transmission through the support frame.
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 effectively joins the support frame to the electrode sheet while reinforcing the electrolyte membrane, reducing stress concentrations and enhancing the sealing performance, thereby preventing damage and gas leaks.
Implementation Method 1
performing a first laser irradiation process in which the support frame is irradiated with a laser beam such that a first portion of the joining material between the support frame and the electrolyte membrane melts
Implementation Method 2
the first portion of the joining material between the support frame and the electrolyte membrane melts and the electrolyte membrane and the support frame are welded to each other
Implementation Method 3
performing a second laser irradiation process in which a second portion of the joining material that is positioned inside the opening of the support frame is irradiated with a laser beam such that the second portion of the joining material melts
Implementation Method 4
the second portion of the joining material melts and is welded to the electrolyte membrane
Data Source
AI summary
A manufacturing method for a fuel cell may comprise preparing an electrode sheet including at least an electrolyte membrane; arranging a joining material constituted of a thermoplastic resin in a frame shape on the electrolyte membrane; arranging a support frame having an opening on the joining material arranged on the electrolyte membrane; performing a first laser irradiation process in which the support frame is irradiated with a laser beam such that a first portion of the joining material between the support frame and the electrolyte membrane melts and the electrolyte membrane and the support frame are welded to each other; and performing a second laser irradiation process in which a second portion of the joining material that is positioned inside the opening of the support frame is irradiated with a laser beam such that the second portion of the joining material melts and is welded to the electrolyte membrane.