Wavy Rib Bipolar Plate for Fuel Cell Mass Transfer and Sealing
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Solution Overview
Problem
Existing bipolar plates for fuel cells face challenges in enhancing fluid disturbance, sealing performance, and production cost, which limit their effectiveness in improving water and gas management and mass transfer efficiency.
Innovation Solution
A bipolar plate design featuring wavy surface ribs and lofted side plates, with specific cosine and Gaussian function-based profiles, allows for enhanced fluid disturbance and sealing, constructed from metal alloy sheets for easy assembly and mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rib/channel structure is used, then structural support is provided, but gas diffusion layer is compressed and water-gas transmission performance is limited
Solution Approach 1:
The patent applies curvature by designing wavy surfaces on the ribs instead of flat surfaces. The wavy ribs create a non-compressing contact with the gas diffusion layer, allowing gas and water to pass through more effectively while still providing structural support. This resolves the contradiction by maintaining structural integrity without compressing the porous layers.
Solution Approach 2:
The patent introduces three-dimensional wavy structures that add vertical dimensionality to the rib design. By creating peaks and valleys in the rib surfaces, the design allows fluid to flow through multiple pathways and levels, improving water-gas transmission while maintaining structural support function.
2Productivity
If multiple three-dimensional through-hole units are used, then gas flow separation and turbulent condition are achieved, but sealing performance is lost and production cost increases
Solution Approach 1:
The wavy surface design creates natural flow separation and turbulence through its curved peaks and valleys, achieving the fluid disturbance effect without requiring separate through-hole units. This maintains sealing integrity while improving mass transfer and water discharge performance.
Solution Approach 2:
The patent combines multiple functions (structural support, flow separation, turbulence generation, and sealing) into a single integrated wavy rib structure. This eliminates the need for separate through-hole components, maintaining sealing performance while achieving the desired fluid disturbance effects.
3Productivity
If cross-shaped protrusion array is used, then forced convection in horizontal direction is enhanced, but forced convection in perpendicular direction cannot be realized
Solution Approach 1:
The wavy rib structure introduces vertical undulations that enable forced convection in the perpendicular direction. The three-dimensional wavy surfaces create flow paths that extend through the thickness of the bipolar plate, achieving multi-directional forced convection that enhances mass transfer and heat exchange efficiency.
4Ease of manufacture
If simple plane bottom surfaces and uniform gas flow paths are used, then manufacturing is simple, but forced convection in perpendicular direction is difficult to realize
Solution Approach 1:
The wavy surface design can be manufactured using standard forming processes for metal sheets, creating curved surfaces through rolling or stamping operations. This maintains relative manufacturing simplicity while achieving the complex three-dimensional flow patterns needed for perpendicular forced convection.
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 design achieves forced convection perpendicular to the reaction plane, improves mass transfer and heat exchange efficiency, ensures sealing performance, and reduces material usage, making it suitable for high-power fuel cell stacks.
Implementation Method 1
The design achieves forced convection perpendicular to the reaction plane
Implementation Method 2
a flow field with high disturbance can promote mass transfer, water discharge, and heat exchange of fuel cells
Data Source
AI summary
A bipolar plate capable of enhancing fluid disturbance for fuel cells includes an anode plate and a cathode plate. The anode plate and the cathode plate include a plurality of polar plate units. Each of the polar plate units includes a left rib, a left side plate, a middle rib, a right side plate, and a right rib. Each of the ribs are formed by wavy surfaces, and peaks of the wavy surfaces of every two adjacent ribs are spaced apart from each other. Every two adjacent ribs are connected through one side plate, and the side plates are formed by lofted surfaces. The anode plate and the cathode plate are mounted back-to-back and are attached together.