Fuel Cell Bipolar Plate Bead Structure for Crash Seal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel cells experience seal deformation during crashes due to varying seal forces in leading and trailing cells, leading to potential reactant and coolant leakage, which compromises the structural integrity and impact resistance.
Innovation Solution
Incorporation of an energy attenuating bead with distinct stiffness from the seal bead, positioned to absorb acceleration forces and maintain seal integrity by deforming to accommodate changes in seal forces during crashes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal bead is used to prevent reactant leakage, then sealing reliability is improved, but during crash events the seal bead deforms due to varying seal forces causing leakage
Solution Approach 1:
The seal bead is divided into multiple segments or cells along its length, allowing each segment to independently deform and absorb impact forces while maintaining overall sealing integrity. This segmentation enables the seal to accommodate crash-induced forces without compromising the sealing function.
Solution Approach 2:
The seal bead's physical parameters such as stiffness, elasticity, or material composition are modified to enable it to deform under crash conditions while maintaining sealing capability. This parameter change allows the seal to transition from a rigid structure to a more compliant one that can absorb impact forces.
2Object-affected harmful factors
If the seal bead is made more compliant to accommodate crash forces, then impact resistance is improved, but sealing precision may deteriorate
Solution Approach 1:
Different portions of the seal bead are given different local properties - some regions are made more compliant to absorb impact forces while other regions maintain higher stiffness to ensure precise sealing. This local differentiation allows the seal to simultaneously achieve impact resistance and sealing precision.
Solution Approach 2:
The seal bead is designed with dynamic characteristics that allow it to change its effective stiffness based on applied forces. Under normal operating conditions, it maintains a rigid state for precise sealing, but under crash conditions, it transitions to a more compliant state to absorb impact forces.
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 energy attenuating bead effectively absorbs crash-induced forces, maintaining seal integrity and preventing leakage, enhancing the structural resilience of the fuel cell system.
Implementation Method 1
An energy attenuating bead extends about the bipolar plate spaced from the seal bead... the energy attenuating bead effectively absorbs crash-induced forces, maintaining seal integrity and preventing leakage
Data Source
AI summary
A fuel cell system includes a plurality of stacked bipolar plate assemblies. Each of the plurality of stacked bipolar plate assemblies includes a first subgasket including a first peripheral edge. The first subgasket supports a first membrane electrode assembly (MEA). A second subgasket including a second peripheral edge. The second subgasket supports a second MEA. A bipolar plate is disposed between the first subgasket and the second subgasket. The bipolar plate has a first side defining a first plurality of passages receptive of a cathode fluid, a second side defining a second plurality of passages receptive of an anode fluid, and a plurality of coolant passages defined between the first subgasket and the second subgasket. A seal bead extends around the bipolar plate. The seal bead seals against the first subgasket and the second subgasket. An energy attenuating bead extends about the bipolar plate spaced from the seal bead.