Fuel Cell Separator Positioning Structure to Limit Stacking Deformation
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Solution Overview
Problem
In fuel cell stacks, the frictional force between positioning holes and knock pins can cause deformation of separators, which is undesirable for maintaining electrical insulation and accurate positioning of stack units.
Innovation Solution
The separators are designed with a positioning section that has a bent surface, reducing friction when guided by a guide bar, thereby minimizing deformation during stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If positioning holes and knock pins are used to position stack units, then positioning accuracy is improved, but separator deformation increases due to frictional force
Solution Approach 1:
The invention changes the surface parameter of the positioning section by forming a bent surface with a specific radius of curvature (R1 ≥ 5mm). This parameter change reduces the friction coefficient between the positioning section and guide bar, thereby reducing frictional force and separator deformation while maintaining positioning accuracy.
Solution Approach 2:
The invention applies curvature to the positioning section by forming a bent surface with a predetermined radius of curvature. This curved surface reduces contact friction compared to a flat surface, allowing smooth movement along the guide bar while maintaining accurate positioning, thus resolving the contradiction between positioning accuracy and separator deformation.
2Reliability
If stack units are stacked together with high positioning accuracy, then fluid seal performance is improved, but separator deformation increases due to frictional force
Solution Approach 1:
The bent surface with radius of curvature R1 ≥ 5mm changes the friction parameter, reducing frictional force during stacking. This allows achieving high positioning accuracy for fluid seal performance while minimizing separator deformation that would compromise reliability.
Solution Approach 2:
The curved bent surface on the positioning section reduces friction during the stacking process, enabling accurate positioning of stack units for fluid seal performance without causing excessive separator deformation that would affect reliability.
3Ease of manufacture
If the positioning section has a flat surface, then manufacturing is simpler, but frictional force increases causing separator deformation
Solution Approach 1:
The invention forms a bent surface with a specific radius of curvature (R1 ≥ 5mm) on the positioning section. This can be achieved through standard bending or forming processes during separator manufacturing, adding minimal complexity while dramatically reducing frictional force and separator deformation.
Solution Approach 2:
By forming a bent surface with predetermined radius of curvature, the invention reduces friction between the positioning section and guide bar. This curvature can be integrated into the manufacturing process with minimal additional steps, achieving reduced separator deformation without significantly increasing manufacturing 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
This design allows for easy and accurate positioning of stack units while suppressing deformation of the separators, ensuring reliable electrical insulation and efficient stacking.
Implementation Method 1
the frictional force generated between the inner peripheral surface of the positioning hole and the outer peripheral surface of the knock pin
Data Source
AI summary
A separator for a fuel cell is overlapped with a membrane electrode assembly to form a stack unit of a power generation cell stack body. The separator is provided with a positioning section to be overlapped in the stacking direction in a manner that the stack units are positioned with respect to each other. A marginal portion of the positioning section has a bent surface formed by bending the separator.