Fuel Cell Separator Layout for Straight Gas Flow and Burr Prevention
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Solution Overview
Problem
The existing separator structures in fuel cells often result in gasket burrs during gasket injection, which block the flow field and hinder the smooth flow of reaction gases and the discharge of generated water.
Innovation Solution
The proposed separator design features a reaction surface with inlet and outlet flow field plates that replace the conventional gasket support, ensuring a straight flow path for reaction gases and preventing deformation, while omitting gasket lines between reaction gas inlet and discharge holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional gasket support structure is used between reaction gas inlet holes, then the gasket can be properly supported during injection, but gasket burrs form that block the flow field and hinder gas flow
Solution Approach 1:
The patent removes the conventional gasket support structure between reaction gas inlet holes and extracts only the essential function of supporting the gasket during injection. The gasket support is eliminated in the region between inlet holes and reaction regions, preventing burr formation while maintaining airtightness through alternative design features.
Solution Approach 2:
The separator is divided into distinct functional regions: reaction regions with gasket support for airtightness, and inlet regions without gasket support to prevent burrs. This segmentation allows different parts of the separator to have different gasket support configurations optimized for their specific functions.
2Reliability
If gasket lines are formed between reaction gas inlet and discharge holes, then airtightness is maintained, but the flow path is blocked and gas cannot flow smoothly
Solution Approach 1:
The gasket line configuration varies by location: in reaction regions, gasket lines are formed to ensure airtightness, while in inlet regions between manifolds and reaction regions, gasket lines are intentionally omitted to create open flow paths. This local differentiation resolves the contradiction between airtightness and flow smoothness.
3Productivity
If the separator structure is simplified to allow straight gas flow, then gas flow efficiency improves, but the separator may deform under operating conditions
Solution Approach 1:
Flow field plates are pre-installed on the separator surface before operation to maintain the separator's structural stability. These plates provide reinforcement without blocking the straight flow path, allowing the separator to resist deformation while maintaining high gas flow efficiency.
Data Source
AI summary
An enhanced fuel cell separator design prevents gasket burrs during gasket line formation and facilitates straight-line movement of reaction gas and water, thereby improving overall gas flow. The fuel cell unit incorporates the fuel cell separator featuring a reaction surface, a cooling surface, a central reaction region, and surrounding manifolds.