Stacked PCB Fuel Cell Boards With Integrated Cooling and MEA Control
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Solution Overview
Problem
Current fuel cell designs face challenges such as complex and expensive bipolar plates, risk of fuel mixing, corrosion issues, and inefficient cooling, leading to reduced power density and reliability due to the need for cumbersome cooling systems and monolithic power electronics.
Innovation Solution
The design incorporates electrically insulating spacers between fuel cell boards, using plastic instead of conductive bipolar plates, with integrated cooling channels and independent switches for each MEA, allowing for efficient reactant separation and control, and employs PCB technology for manufacturing, enabling simpler assembly and fault tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bipolar plates are used to conduct current between MEAs, then electrical conductivity is achieved, but device complexity and manufacturing cost increase due to the need for complex flow-field channels and corrosion-resistant materials
Solution Approach 1:
The bipolar plate is segmented into two separate functional components: a conductive plate for electrical current collection and a separate flow field plate for reactant distribution. This segmentation allows each component to be optimized independently, reducing overall complexity while maintaining electrical conductivity functionality.
Solution Approach 2:
The flow-field channel structure is extracted from the bipolar plate and integrated directly into the MEA design. This removes the need for complex bipolar plate structures with embedded channels, simplifying the bipolar plate to its essential electrical conduction function while reducing manufacturing complexity.
2Reliability
If metallic bipolar plates are used for electrical conduction, then conductivity is achieved, but corrosion resistance deteriorates in the humid fuel cell environment
Solution Approach 1:
The bipolar plate employs a composite structure combining a metallic substrate (providing electrical conductivity) with a corrosion-resistant coating layer (providing protection against humid environment degradation). This composite approach maintains electrical performance while eliminating corrosion issues.
Solution Approach 2:
The design uses inexpensive, easily replaceable polymer components with integrated flow fields that can be discarded and replaced without affecting the expensive metallic bipolar plates, thereby protecting the investment in corrosion-resistant materials.
3Ease of operation
If monolithic power electronics are used for output regulation, then electrical output control is achieved, but reliability decreases due to point failure affecting the whole system
Solution Approach 1:
The power electronics system is segmented into multiple independent modular units, each associated with specific fuel cell stacks or MEAs. This modular architecture allows individual units to fail without affecting the entire system, maintaining reliability while preserving output regulation capability through parallel operation of multiple modules.
4Temperature
If complex cooling systems are added to fuel cell stacks, then overheating is prevented, but device complexity and practical applicability worsen
Solution Approach 1:
The cooling system is merged with the existing bipolar plate and MEA structure, utilizing the same physical components for multiple functions. The bipolar plates and MEAs serve both electrical conduction/reactant distribution and thermal management functions, eliminating the need for separate complex cooling systems.
Solution Approach 2:
The fuel cell stack structure itself provides cooling functionality through its inherent design features, such as natural convection channels and thermal conduction paths built into the bipolar plates and MEAs, eliminating the need for external active cooling systems.
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 design enhances power density, reduces manufacturing costs, and improves reliability by allowing independent control and monitoring of each MEA, preventing fuel mixing, and simplifying cooling, resulting in a more resilient and efficient fuel cell system.
Implementation Method 1
the use of a Shape Memory Alloy (SMA) in low profile valves in fuel cells
Data Source
Figure 1
Figure 2a
Figure 2b~3
AI summary
A fuel cell comprising at least two stacked fuel cell boards (22) which each comprise a membrane of substantially gas impervious electrolyte material and at least two electrode pairs wherein the anode and cathode of each said electrode pair are arranged on respective faces of said membrane. An electrode of each pair of electrodes is connected to an electrode of an adjacent pair of electrodes by a through-membrane connection (13) or by an external connection on a Printed Circuit Board, comprising an electrically conductive region of said electrolyte material. A method for forming the through-membrane electrical connections in the electrolyte membrane is also disclosed.