Offset Sealing Members for Uniform Fuel Cell Pressure
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Solution Overview
Problem
Existing plate assemblies in fuel cells face challenges in achieving uniform pressure and sealing force along the seal path due to the fixed alignment of sealing members, leading to potential fluid leakage and inefficiencies in energy generation.
Innovation Solution
The use of offset-aligned sealing members with varying base widths and cyclical patterns on bipolar plates, where the maximum and minimum widths of one pair of sealing members are aligned with the minimum and maximum widths of another pair, respectively, to achieve uniform pressure and increased sealing force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing members are aligned in a fixed straight line configuration, then the structure is simple and easy to manufacture, but the pressure distribution along the seal path is non-uniform leading to potential fluid leakage
Solution Approach 1:
The sealing members are intentionally misaligned in an asymmetric pattern rather than being positioned in a straight line. The offset distances between adjacent sealing members vary along the seal path, creating an asymmetric configuration that distributes compression forces more uniformly across the sealing interface, thereby improving sealing performance without requiring complex active control mechanisms
Solution Approach 2:
The non-uniform offset distances between sealing members are pre-calculated and built into the assembly during manufacturing. This preliminary configuration ensures that when compression is applied, the sealing members engage in an optimized sequence that achieves uniform pressure distribution along the seal path, eliminating the need for real-time adjustment or complex control systems
2Reliability
If sealing members have uniform width along their length, then manufacturing is simpler, but the sealing force is insufficient to prevent fluid leakage under varying compression conditions
Solution Approach 1:
The sealing members feature variable width along their length, with wider sections positioned at locations requiring greater sealing force and narrower sections where less force is needed. This local variation in geometry optimizes the sealing force distribution to match the actual sealing requirements at different positions along the seal path, preventing fluid leakage while avoiding unnecessary material usage and manufacturing complexity
Solution Approach 2:
The width parameter of the sealing members is intentionally varied along their length rather than maintaining a constant uniform width. This parameter change creates a non-uniform cross-sectional profile that allows the sealing members to generate appropriate sealing forces at different locations under compression, improving reliability while the variable geometry can be incorporated into standard manufacturing processes
Data Source
AI summary
A plate assembly includes a first plate and a second plate positioned adjacent to one another. The first plate includes a first sealing member formed thereon. The second plate includes a second sealing member formed thereon. The first sealing member includes a first end surface and first opposing sides extending from the first end surface. The second sealing member includes a second end surface and second opposing sides extending from the second end surface. The first and second sealing members are offset relative to one another by a first offset distance (D1) in a first longitudinal direction. By varying the sealing member's base width periodically, a greater sealing force is achieved. By offsetting alignment of pairs of sealing members along the seal path, uniform pressure along the seal path is achieved.