Bonded Polyimide Fuel Cell Package Integrating Heaters and Manifolds
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Solution Overview
Problem
Existing fuel cell technologies face challenges in efficiently managing temperature control, fuel distribution, and by-product removal within a compact and integrated system, particularly at elevated temperatures up to 200°C, which affects the performance and efficiency of fuel cell systems.
Innovation Solution
A bonded polyimide microfluidic fuel cell system is developed, comprising multiple polyimide layers with integrated resistive heaters, microfluidic channels, anode and cathode manifolds, and a membrane electrode assembly (MEA) with an electrolyte, where each layer is carefully patterned and bonded to form a sealed system with electrical and fluidic connections, enabling efficient fuel flow and by-product removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate components are used for temperature control, fuel distribution, and by-product removal, then system functionality is achieved, but device complexity increases
Solution Approach 1:
The patent combines temperature control heaters, fuel distribution manifolds, and by-product removal channels into a single integrated polyimide layer structure. This merging of previously separate components into one multifunctional layer directly reduces device complexity while maintaining all necessary system functionalities.
Solution Approach 2:
The polyimide layers are designed to perform multiple functions simultaneously - serving as structural support, thermal management elements, fluid distribution networks, and sealing barriers. This multi-functionality allows a single component to replace multiple specialized parts, thereby reducing overall system complexity.
2Device complexity
If a compact integrated system is used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The polyimide layers are pre-patterned with alignment features, bonding surfaces, and integrated functional elements before assembly. This preliminary preparation ensures that when layers are bonded together, the alignment requirements are already built into the structure, reducing the precision demands during the actual bonding process.
Solution Approach 2:
The use of flexible polyimide layers allows for some tolerance in alignment during bonding, as the material can accommodate minor variations without compromising the seal or functionality. This flexibility reduces the stringent precision requirements that would be necessary with rigid materials.
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
The system effectively controls temperature, distributes fuel, and removes reaction by-products, enhancing the performance and efficiency of fuel cells, allowing for power outputs ranging from 100 milliwatts to 20 Watts, and enabling scalable and compact fuel cell designs.
Implementation Method 1
at least one layer contains at least one resistive heater
Data Source
AI summary
Described herein are processes for fabricating microfluidic fuel cell systems with embedded components in which micron-scale features are formed by bonding layers of DuPont Kapton™ polyimide laminate. A microfluidic fuel cell system fabricated using this process is also described.