Fuel Cell Separator Protrusions for Load Transfer
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Solution Overview
Problem
Fuel cell stacks face challenges in load transfer and pressure equalization in the stacking direction, leading to potential misalignment and shear stress on components.
Innovation Solution
The arrangement of protrusions on separators, where first and second ridges of one separator overlap with corresponding ridges of another separator in the stacking direction, creating a mechanism for load transfer and pressure equalization across cell units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separators have simple flat structures, then manufacturing is simple and cost is low, but load transfer in stacking direction is insufficient and pressure cannot be equalized
Solution Approach 1:
The patent applies curvature by forming protrusions (ridges) on the separator surfaces. These curved/raised structures distribute mechanical loads more effectively across the separator area, enabling better load transfer in the stacking direction while maintaining manufacturing simplicity through conventional forming processes
2Strength
If separators have protrusions arranged to overlap in stacking direction, then load transfer and pressure equalization improve, but separator structure becomes more complex
Solution Approach 1:
The separator surface is segmented into multiple protrusions (ridges) arranged in specific patterns. This segmentation allows the load transfer function to be distributed across multiple discrete elements, achieving effective pressure equalization and load distribution while keeping each individual protrusion simple in form
Solution Approach 2:
The patent employs asymmetric arrangement of protrusions where first and second ridges are positioned at different locations and orientations. This asymmetric configuration optimizes load transfer paths and pressure distribution patterns, achieving superior mechanical performance without requiring complex three-dimensional structures
3Stress or pressure
If separators have overlapping protrusions, then pressure equalization improves, but manufacturing precision requirements increase
Solution Approach 1:
The protrusion structures serve multiple functions simultaneously: they provide mechanical support for load transfer, create pressure equalization through their arrangement pattern, and define reaction gas channels. This multi-functionality reduces the need for additional components and relaxes overall manufacturing precision requirements by combining functions into single structural elements
Data Source
AI summary
A fuel cell stack includes cell units and separators that are alternately stacked, in which each of the cell units includes a single cell. Each of the separators includes: at least one first ridge that is disposed on a first main surface of each of the separators at a predetermined interval to form at least one first gas channel; and at least one second ridge that is disposed on a second main surface of each of the separators at a predetermined interval to form at least one second gas channel. The at least one first ridge and the at least one second ridge are disposed at a regular interval around a center of each of the separators in a cross section perpendicular to the first or second gas channel. The at least one first ridge and the at least one second ridge of the separators are arranged such that a first ridge and a second ridge of a first separator of two of the separators holding each cell unit at least partly overlap respectively with a second ridge and a first ridge of a second separator of the two of the separators in a stacking direction of the separators across a single cell intervened between the two of the separators.