Heat-Resistant Lead Bonding for Gas-Diffusion Layer Sheets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing processing methods for gas-diffusion layer sheets in fuel cells face issues with tape resistance to heat in drying ovens, leading to potential detachment and wrinkle formation in the electrolyte membrane sheets.
Innovation Solution
A processing apparatus that includes a heat-resistant lead bonded with thermosetting resin to the gas-diffusion layer sheet, extending through a drying oven, to maintain bonding strength and reduce wrinkles, with anti-wrinkle features like cuts in the lead to further minimize creasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tapes are used to connect the dummy sheet and back sheet, then the connection is simple and easy to implement, but the tapes cannot maintain bonding strength in the drying oven and may come off or exert adverse effects on the electrolyte membrane sheet
Solution Approach 1:
The patent changes the material parameter of the connecting element from ordinary tape to heat-resistant lead, which can withstand the high temperatures in the drying oven. This parameter change enables the connecting element to maintain its bonding strength and structural integrity during the heat treatment process, resolving the contradiction between ease of manufacture and high-temperature reliability
Solution Approach 2:
The patent employs a composite structure where the heat-resistant lead is impregnated with thermosetting resin. This composite material combination provides both the heat resistance of the lead and the bonding strength of the cured resin, ensuring reliable connection that can withstand the drying oven conditions while maintaining ease of implementation
2Strength
If thermosetting resin is applied to bond the heat-resistant lead to the gas-diffusion layer sheet, then bonding strength is improved, but solvent vaporization may cause wrinkle formation in the sheet
Solution Approach 1:
The patent utilizes the porous structure of the gas-diffusion layer sheet to allow solvent vapor to escape during the drying process. The pores provide channels for vapor release, preventing pressure buildup that would cause wrinkles. This enables the use of thermosetting resin for strong bonding without the adverse shape effects of wrinkle formation
Solution Approach 2:
The patent applies the thermosetting resin to the heat-resistant lead before bonding to the gas-diffusion layer sheet. This preliminary application allows controlled impregnation and solvent evaporation through the porous structure before the resin cures, preventing wrinkle formation while ensuring strong bonding strength in the final product
3Reliability
If the heat-resistant lead extends through the processing oven, then heat resistance and bonding durability are ensured, but the lead may exert adverse effects on the product during heat processing
Solution Approach 1:
The porous structure of the gas-diffusion layer sheet allows solvent vapor from the thermosetting resin to escape during heat processing. This prevents vapor accumulation that could cause adverse effects on the product, while the heat-resistant lead maintains its position and bonding durability throughout the process
Solution Approach 2:
The gas-diffusion layer sheet acts as an intermediary between the heat-resistant lead and the external environment during heat processing. It allows controlled interaction by permitting solvent vapor to pass through its porous structure, thereby protecting the product from adverse effects while maintaining the bonding durability provided by the heat-resistant lead
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
Ensures heat resistance and bonding durability, preventing adverse effects from thermosetting resin and reducing wrinkle formation during heat processing, while allowing solvent vapor release through the porous sheet.
Implementation Method 1
solvent vapor resulting from vaporization of the solvent contained in the thermosetting resin
Implementation Method 2
a processing oven (e.g., a drying oven 30 to be described later) configured to heat process a portion of the gas-diffusion layer sheet
Data Source
AI summary
The processing apparatus includes: a first roller 10 around which a gas-diffusion layer sheet (carbon paper CP) is wound, the gas-diffusion layer sheet being an electrically conductive porous member; a second roller 20 configured to take up the carbon paper CP wound around the first roller 10; and a processing oven configured to heat process a portion of the carbon paper CP, the portion having been fed from the first roller 10 but not yet taken up by the second roller 20. A heat-resistant lead LE is provided, the heat-resistant lead LE having a length at least extending from the first roller 10 to the second roller 20 through the processing oven, being configured to be taken up by the second roller 20, and being bonded to the carbon paper CP impregnated with a thermosetting resin AD.