Fuel Cell Separator Plate Dual-Airflow Heat Dissipation
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Solution Overview
Problem
Open-cathode proton exchange membrane fuel cells face challenges in heat management, particularly in high power operations, where uneven thermal distribution can damage membranes and reduce power output, due to the generation of large quantities of heat in compact spaces.
Innovation Solution
A fuel cell assembly with a dual-airflow system, where oxidant flow channels in separator plates form both a primary and secondary flow passage, with radiating fins extending beyond the active area to facilitate even heat distribution, using materials with good thermal conductivity for effective heat conduction and airflow through the stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If open-cathode PEM fuel cells operate in high power mode, then power output increases, but heat generation increases causing uneven thermal distribution and membrane damage
Solution Approach 1:
The separator plate is segmented into multiple functional zones: an active area portion that contacts the fuel cell and a peripheral portion that extends beyond the active area. This segmentation allows different regions to serve different purposes - the active area portion for electrochemical reactions and the peripheral portion for heat dissipation, thereby resolving the thermal management issue during high power operation
Solution Approach 2:
The invention extends the separator plate structure from a two-dimensional plane within the active area into a three-dimensional configuration by adding a peripheral portion that protrudes beyond the active area boundaries. This dimensional extension creates additional surface area for heat radiation and airflow, enabling effective thermal management while maintaining high power output
2Volume of moving object
If compact fuel cell stacks are used, then space efficiency increases, but heat management becomes difficult due to limited space for heat dissipation
Solution Approach 1:
The separator plate performs multiple functions simultaneously: it serves as a structural component separating cells, provides flow channels for reactants, collects current, and acts as a heat dissipation structure through its peripheral portion. This multi-functionality allows compact stack design without compromising heat management capabilities
Solution Approach 2:
The peripheral portion of the separator plate automatically serves as a heat dissipation structure without requiring additional external cooling components. The extended portion naturally facilitates heat radiation and airflow in the peripheral region, enabling the compact stack to self-regulate its thermal environment during operation
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 dual-airflow system achieves uniform thermal distribution, improving the stability and durability of the fuel cell stack by effectively removing heat and maintaining power output, suitable for high power applications.
Implementation Method 1
using materials with good thermal conductivity for effective heat conduction and airflow through the stack
Implementation Method 2
A plurality of oxidant flow channels is formed in the separator plates. The oxidant flow channels define a first flow passage.
Data Source
AI summary
A fuel cell assembly (10) is provided. The fuel cell assembly (10) includes a first endplate (12), a second endplate (14), a plurality of separator plates (16) provided between the first and second endplates (12) and (14), and a plurality of fuel cells (18) forming a fuel cell stack (20). Each of the fuel cells (18) is provided between adjacent ones of the separator plates (16). A plurality of oxidant flow channels (22) is formed in the separator plates (16). The oxidant flow channels (22) define a first flow passage. Each of the fuel cells (18) has an active area. A portion (28) of the separator plates (16) extends beyond the active area of the fuel cells (18) to define a second flow passage at a downstream portion of the first flow passage.