Micro Fuel Cell System with Common Diffusion Chamber
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Solution Overview
Problem
Existing micro fuel cell systems for portable electronic applications face challenges with complex construction, high material usage, and limited versatility due to the need for high-pressure gaseous reactants and bulky substrates, which affect power density and cost-effectiveness.
Innovation Solution
A modular system comprising at least two micro fuel cells with a spacer element having a common diffusion chamber and annular cavity, allowing simultaneous fuel supply and improved energy generation efficiency, while reducing occupied surface area and enabling series or parallel connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional micro fuel cell systems use high-pressure gaseous reactants and bulky substrates, then reliable power generation is achieved, but device complexity and material usage increase
Solution Approach 1:
The patent merges multiple micro fuel cells into a single integrated unit with shared components. The common diffusion chamber serves multiple anodes simultaneously, and the single cathode structure is shared across all fuel cell units, reducing the number of separate substrates and simplifying the overall system construction while maintaining reliable power generation.
Solution Approach 2:
The bipolar plate structure serves multiple functions simultaneously: it acts as a cathode for one fuel cell unit, an anode for the next unit, provides structural support, facilitates gas distribution, and enables electrical connections. This multi-functionality reduces the need for separate components and simplifies system construction.
2Power
If multiple separate micro fuel cells are used to increase power output, then energy generation increases, but occupied surface area and material usage increase
Solution Approach 1:
The patent combines multiple fuel cell units into a compact integrated structure where they share common diffusion chambers, cathodes, and bipolar plates. This merging allows the system to generate increased power through multiple anodes while occupying significantly less surface area than separate fuel cells would require.
Solution Approach 2:
The fuel cell units are arranged in a planar configuration rather than stacked vertically, utilizing horizontal space efficiently. The bipolar plates are positioned to facilitate both gas flow and electrical connections in a two-dimensional layout, maximizing power output per unit surface area.
3Strength
If traditional substrates with high mechanical strength are used, then structural integrity is maintained, but weight and material cost increase
Solution Approach 1:
The bipolar plates are treated mechanically only in the specific regions where structural support and gas distribution are needed, rather than requiring high strength throughout the entire substrate. This localized treatment reduces material usage and weight while maintaining sufficient structural integrity for the application.
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 achieves double the energy generation on a given surface area, improves power density, and reduces material usage, making it more compact, versatile, and cost-effective, with enhanced performance and adaptability to varying power demands.
Implementation Method 1
The membrane PEM has the characteristic of easily absorbing the water, of not allowing the passage of the gases, thus maintaining hydrogen and oxygen separated from each other, and of being a conductor of ions but not of electrons.
Implementation Method 2
an anode A supplied with gaseous hydrogen H2 as a reactant and here, by means of a catalyst, it is separated into protons and electrons
Implementation Method 3
an anode A supplied with gaseous hydrogen H2 as a reactant and here, by means of a catalyst, it is separated into protons and electrons
Implementation Method 4
a cathode C supplied with oxygen as a reactant... To the cathode C: 1⁄2 O2+2H++2e−→H2O
Implementation Method 5
The oxide-reduction reactions for the generation of the electric power to the anode A and to the cathode C, with a suitable catalyst being present
Implementation Method 6
The carbon layers have a portion of a front layer that serves as a diffusion layer of the gas or GDL (Gas Diffusion Layer) and that comprises prearranged and suitable serpentines of outflow channels of the gaseous hydrogen H2
Data Source
AI summary
Embodiment of a system for generating electric power with micro fuel cells comprising at least one first micro cell and at least one second micro cell, each micro cell having an anode and a cathode with a membrane being sandwich-wise interposed, the system comprising a spacer element having an annular element that surrounds a cavity, said spacer element being associated with said anode of said first micro cell and with said anode of said second micro cell to realize a common diffusion chamber for the fuel of said first micro cell a of said second micro cell.