Additive Fuel Cell Flow Fields with Varying Cross-Sectional Areas
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Solution Overview
Problem
Conventional methods for manufacturing flow field plates for fuel cells often result in stress points and increased thickness or weight due to machining, which contradicts the goal of creating smaller and lighter fuel cells.
Innovation Solution
The use of additive manufacturing to create flow field channels with varying cross-sectional areas, allowing for precise material application and elimination of special tooling, resulting in thinner, lighter plates with controlled pressure drop and gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional machining or molding methods are used to create flow field channels, then the channels can be formed in the plate, but stress points are created within the plate requiring greater thickness and/or weight for structural accommodation
Solution Approach 1:
The patent changes the manufacturing method from subtractive (machining) or high-pressure molding to additive manufacturing. This parameter change in the manufacturing process eliminates stress points while enabling lighter plate designs with varying cross-sectional areas in the flow channels
Solution Approach 2:
The patent introduces dimensional variation in the flow channel cross-section by adding depth variation (varying cross-sectional area as a function of depth). This third dimension allows for optimized flow distribution without increasing overall plate thickness or weight
2Ease of manufacture
If conventional machining or molding methods are used to create flow field channels, then the channels can be formed in the plate, but the plate thickness and/or weight must be greater than desired for structural accommodation
Solution Approach 1:
The patent changes the manufacturing method from conventional machining or molding to additive manufacturing, which eliminates the need for increased plate thickness to accommodate stress points. The additive process inherently creates stress-free structures
Solution Approach 2:
The patent utilizes depth variation of the flow channels (varying cross-sectional area as a function of depth) to optimize flow distribution while maintaining reduced plate thickness. This dimensional approach allows structural efficiency without compromising flow performance
3Manufacturing precision
If additive manufacturing is used to form channel walls directly onto the plate body, then material is applied precisely and special tooling is eliminated, but the manufacturing process complexity increases
Solution Approach 1:
The additive manufacturing process is self-service in that it builds channels layer by layer directly on the plate body without requiring external tooling or fixtures. The process inherently positions and forms the channels with precise material deposition
Solution Approach 2:
The patent extracts the need for special machining tooling and complex fixture setups by using additive manufacturing. This eliminates the complex manufacturing equipment and tooling required for conventional methods
Data Source
AI summary
A plate for a fuel cell includes a first plate body defining a first flow field channel in a first surface thereof. The first flow field channel has a cross-sectional area that varies as a function of depth from the first surface of the plate body toward an opposed second surface. The cross-sectional area can increase and/or decrease from the first surface toward the opposed second surface.