Bipolar Plate Seal Split Corners for Uniform Contact Pressure
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Solution Overview
Problem
Existing fuel cell bipolar plate seals, particularly raised bead seals, face issues with non-uniform stiffness leading to incomplete sealing under normal conditions and potential leakage under extreme loads due to uneven contact pressure, especially at corners.
Innovation Solution
Incorporating split corners with connections in the raised beads of bipolar plates to reduce contact pressure and enhance uniformity of seal contact pressure along the seal path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a raised bead seal is used to prevent fluid leakage, then sealing effectiveness is improved, but non-uniform stiffness distribution causes uneven contact pressure especially at corners leading to potential sealing failure
Solution Approach 1:
The patent applies local quality by modifying only the corner regions of the raised bead seal while leaving the mid-section intact. Split corners are introduced at the four corners of the raised bead, creating localized compliance zones where the seal material can deform more easily to achieve uniform contact pressure, while the stiffer mid-section maintains overall structural integrity and sealing force.
Solution Approach 2:
The patent segments the corner regions of the raised bead seal by introducing split corners with connections. This segmentation divides the continuous corner material into separate segments that can independently deform and conform to the sealing surface, allowing each segment to optimize its contact pressure independently rather than being constrained by the rigid corner structure.
2Reliability
If the raised bead seal is compressed to form a tight seal, then leakage prevention is improved, but under extreme loads the bead becomes over-compressed leading to leaking or fuel cell stack failure
Solution Approach 1:
The patent applies beforehand cushioning by introducing split corners with connections that act as built-in compliance elements. These split corners provide a cushioning effect by allowing controlled deformation and energy absorption during extreme compression events, preventing the seal from becoming over-compressed and failing catastrophically under crash or extreme load conditions.
3Stress or pressure
If connections are added at bead corners to reduce contact pressure, then contact pressure uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the corner regions by introducing split corners with connections, which are simple geometric modifications rather than complex additional components. This segmentation achieves contact pressure uniformity through straightforward structural division that can be integrated into the existing raised bead seal manufacturing process without significantly increasing device complexity.
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 solution effectively reduces average corner contact pressure and improves the uniformity of seal contact pressure, preventing leakage and ensuring a tighter seal even under extreme conditions.
Implementation Method 1
The generally arcuate cross sectional shape of the raised bead seal provides an elastic response to a load in a direction normal to the planar metal sheet
Data Source
AI summary
A number of variations may include a product that may include a fuel cell stack assembly that may include at least one bipolar plate including at least one first raised bead which may include a first split corner which may include a first connection.