Fuel Cell Stack Insulator With Separator-Matching Recesses
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Solution Overview
Problem
Existing fuel cell stacks face challenges in efficiently integrating separators and insulators, leading to complex and costly structures that hinder the simplicity and economy of the overall system.
Innovation Solution
The fuel cell stack design incorporates a stacked body with membrane electrode assemblies and separators, where terminal plates, insulators, and end plates are strategically positioned with protrusion and recess portions that match the shape of the separators, allowing for a simpler and more economical structure by eliminating the need for specialized separator designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If dummy cells are disposed on end portions of stacked body to function as heat insulating layers, then thermal insulation is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent combines the heat insulating layer with the existing end plate structure, eliminating the need for separate dummy cells. The end plate is designed with integrated insulation functionality, merging two components (insulator and end plate) into one unified structure that performs both thermal insulation and structural support functions.
Solution Approach 2:
The end plate is designed to serve multiple functions simultaneously: it provides thermal insulation, structural support, and sealing functions. This multi-functional design eliminates the need for separate dummy cells while maintaining all necessary functions, thereby reducing device complexity.
2Device complexity
If specialized separator designs are used to integrate with insulators, then structural integration is improved, but manufacturing cost increases
Solution Approach 1:
Instead of modifying the separator to integrate with the insulator (which would increase manufacturing cost), the patent inverts the approach by designing the insulator to match the separator's protrusion and recess shape. This allows standard separators to be used without modification while achieving seamless integration.
Solution Approach 2:
The insulator is designed with a shape that copies or corresponds to the protrusion and recess features of the separator. This shape correspondence allows the insulator to fit around the separator perfectly, achieving structural integration without requiring specialized or modified separators.
3Device complexity
If insulators with protrusion and recess portions matching separator shapes are used, then structural integration and simplicity are improved, but manufacturing precision requirements increase
Solution Approach 1:
The separator's protrusion and recess shape features are designed first as standard components. The insulator is then preliminarily designed to correspond to these existing features, allowing for standardized manufacturing processes and reducing the need for high-precision custom fitting.
Data Source
AI summary
A fuel cell stack includes a stacked body which includes separators and a membrane electrode assembly. A first terminal plate, a first insulator, and a first end plate are disposed at a first end of the stacked body. A second terminal plate, a second insulator, and a second end plate are disposed at a second end of the stacked body. Each of the first terminal plate and the second terminal plate is provided in a first recessed portion formed in each of the first insulator and the second insulator. Each of the first and second insulators includes an outer peripheral part and a protrusion and recess portion in the outer peripheral part which is in contact with each of the separators that is disposed at the first and second ends. The protrusion and recess portion has a shape corresponding to a protrusion and recess shape of the separator.