Micro Fuel Cell on Flexible Substrate with 3D Interchange
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Solution Overview
Problem
Conventional fuel cells face challenges in miniaturization for portable applications like cell phones due to limitations in power density, energy density, and reliability, particularly in providing hydrogen access and aligning holes in rigid substrates, which leads to fragility and high fabrication costs.
Innovation Solution
The development of integrated micro fuel cells on a flexible substrate with a three-dimensional fuel/oxidant interchange, using a templated process to create high aspect ratio anodes and cathodes, allowing for increased surface area and eliminating the need for precise hole alignment, thus enhancing manufacturing ease and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional planar stacked layers with rigid substrates are used, then structural stability is achieved, but manufacturing precision deteriorates due to alignment difficulties of holes and increased fabrication complexity
Solution Approach 1:
The patent transitions from planar 2D fuel cell design to a 3D vertical stacked architecture. Multiple fuel cell layers are stacked vertically with fuel channels extending through multiple layers, enabling fuel distribution in three dimensions. This eliminates the need for precise lateral alignment of holes while maintaining structural stability through vertical stacking and bonding interfaces.
Solution Approach 2:
The fuel cell is divided into multiple discrete stacked layers, each containing fuel channels and electrochemical components. These modular layers can be fabricated separately and then bonded together, allowing independent optimization of each layer and simplifying the manufacturing process by eliminating complex in-plane alignment requirements.
2Strength
If functional area is restricted to perimeter by vias, then structural integrity is maintained, but power density deteriorates due to limited active area
Solution Approach 1:
The patent extends fuel channels vertically through multiple stacked layers, transforming the fuel distribution system from a 2D perimeter-based via structure to a 3D vertical channel network. This enables the active functional area to extend throughout the entire volume of the fuel cell stack, dramatically increasing power density while maintaining structural integrity through the bonded layer architecture.
3Volume of moving object
If miniaturization is pursued for portable applications, then size is reduced, but reliability deteriorates due to fragility and alignment issues in rigid substrates
Solution Approach 1:
The fuel cell is segmented into multiple thin stacked layers that can be fabricated using standard microfabrication techniques and then bonded together. This modular approach enables miniaturization while improving reliability, as each thin layer is less prone to cracking and the stacked architecture provides mechanical robustness. The modular design also simplifies assembly and potential replacement of individual layers.
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
This approach enables the creation of high-power density, reliable micro fuel cells with increased surface area, facilitating easier integration and packaging, while avoiding the fragility and alignment issues of traditional methods, thus meeting the requirements for portable power sources.
Implementation Method 1
integrated micro fuel cells on a flexible substrate with a three-dimensional fuel/oxidant interchange
Implementation Method 2
templated process to create high aspect ratio anodes and cathodes
Data Source
AI summary
A method is provided for fabricating an integrated micro fuel cell that derives power from a three-dimensional fuel/oxidant interchange having increased surface area and that is positioned on a second substrate that may be either porous or flexible with gas access holes, thereby avoiding precise alignment requirements of the openings providing fuel thereto. The method comprises forming on a first substrate, a plurality of pedestals including an anode and a cathode each comprising a porous metal; positioning an electrolyte between the anode and the cathode; and forming first metal contacts on the anode and cathode. The first substrate is removed and a second substrate is positioned against the fuel cell wherein the first metal contacts are selectively positioned to make electrical contact with second metal contacts on the second substrate.