Fuel Cell Unit with Integrated Resin Frame Fastening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell units require complex and costly production processes, are prone to displacement under impact loads, and have inefficient assembly due to the use of multiple dedicated fastening members and separators with different shapes, leading to increased production costs and reduced miniaturization potential.
Innovation Solution
A fuel cell unit design featuring a rectangular membrane electrode assembly with a picture-frame-like resin frame and integrated fastening members on its sides, allowing for secure integration with a common separator without overlapping fastening members, enabling reliable positioning, retention, and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holding pins and retaining rings are used as fastening members, then the membrane electrode assembly and separator are retained, but the unit cell cannot reliably withstand external impact loads and components may displace under shear load
Solution Approach 1:
The fastening member integrates multiple functions: positioning (protrusion fits into recess), retention (clamps components), and impact resistance (rigid structure with integrated fastening). This merging eliminates the need for separate holding pins and retaining rings, providing reliable impact load resistance while simplifying the fastening structure.
2Reliability
If stepped-shaped holding pin insert hole and retaining ring insert hole are formed in separators, then fastening members are retained, but remarkably complicated drilling process and increased number of components result in high production cost
Solution Approach 1:
The separator is designed with integrated positioning recesses and fastening holes that serve multiple purposes: positioning the membrane electrode assembly, retaining fastening members, and withstanding impact loads. This universal design eliminates the need for separate stepped-shaped holes and multiple insert holes, significantly simplifying the drilling process while maintaining reliable retention.
3Reliability
If multiple dedicated fastening members are used, then the membrane electrode assembly is retained, but assembly efficiency is reduced and production cost increases
Solution Approach 1:
The fastening member combines positioning protrusions, retention clamps, and fastening functions into a single integrated component. This eliminates the need for multiple dedicated fastening members, significantly improving assembly efficiency by reducing the number of parts to be installed while maintaining reliable component retention through the integrated structure.
4Adaptability or versatility
If separators with different shapes are used for adjacent cells, then fuel gas and oxygen-containing gas flow fields are formed, but device complexity increases and miniaturization is hindered
Solution Approach 1:
The separator employs an asymmetric design with positioning recesses and flow fields configured to work with the fastening member's protrusions. This asymmetric configuration enables a single separator shape to accommodate both fuel gas and oxygen-containing gas flow fields in adjacent cells, eliminating the need for different separator shapes while maintaining proper gas flow configuration and reducing device complexity.
Data Source
AI summary
A fuel cell unit of a fuel cell contains a first membrane electrode assembly having a frame portion on an outer circumference thereof, a first separator, a second membrane electrode assembly having a frame portion on an outer circumference thereof, a second separator, and a third separator. A plurality of resin pins are formed integrally on the frame portion of the first membrane electrode assembly. The resin pins are integrally inserted into holes in the first separator, holes in the second membrane electrode assembly, holes in the second separator, and holes in the third separator.