Integrated Disc Spring Clamping for Uniform Fuel Cell Stack Force
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Solution Overview
Problem
The existing clamping systems for fuel cell stacks using disk springs result in a non-uniform distribution of force, leading to potential damage due to sensitivity to errors in arrangement and alignment, and require more material for the same spring force, which affects the power density and weight ratio.
Innovation Solution
A clamping system with disk springs connected in a bonded or force-fitting manner, arranged in packages with integral connections and web-like or full-surface connections, providing a more uniform force distribution and reduced material usage, enhancing stability and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If individual disk springs are used in a clamping system, then the spring force can be adjusted, but the force distribution over the fuel cell stack surface becomes non-uniform and the system becomes sensitive to arrangement errors
Solution Approach 1:
Multiple individual disk springs are merged into a single integrated spring element with a unified force-generating structure. This integration ensures that the spring force is distributed uniformly across the fuel cell stack surface through a continuous, monolithic structure that eliminates arrangement errors and positioning variations inherent in using separate springs.
Solution Approach 2:
The integrated spring element is designed with a segmented or modular geometry that allows it to contact multiple points on the fuel cell stack simultaneously. The segmentation is built into the single piece structure, ensuring uniform force distribution while maintaining the benefits of an integrated design.
2Force
If more material is used to increase spring force, then the clamping capability improves, but the weight increases and power density decreases
Solution Approach 1:
The spring element's geometric parameters are optimized to maximize force generation per unit mass. By carefully selecting and adjusting parameters such as thickness, radius, and curvature of the spring element, the design achieves high clamping capability with minimal material usage, thereby reducing weight while maintaining or improving power density.
Solution Approach 2:
The spring element is made from high-strength materials or composite materials that provide exceptional strength-to-weight ratio. This allows the spring to generate the required clamping force with significantly less material compared to conventional springs, directly reducing system weight while maintaining clamping capability.
3Force
If individual disk springs are used, then the spring force can be adjusted, but the arrangement requires high precision and has low fault tolerance
Solution Approach 1:
Multiple spring functions are merged into a single integrated element that is designed to be positioned as one unit. This eliminates the need for precise arrangement of multiple individual springs, as the single piece structure inherently ensures uniform force distribution regardless of minor positioning variations.
Solution Approach 2:
The geometric parameters of the integrated spring element are designed to provide a tolerance buffer, allowing for greater manufacturing and assembly variations while still achieving the desired force distribution. The spring's geometry compensates for positioning errors, reducing the required manufacturing precision.
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 solution achieves a more homogeneous force transmission, reduces material requirements, and improves the power density-to-weight ratio, making the fuel cell system more fracture-resistant and efficient.
Implementation Method 1
A disk spring is in the form of the lateral surface of a flat truncated cone or spherical segment. It is elastically compressed between its peripheral circles
Data Source
AI summary
A fuel cell system comprises a clamping system for a fuel cell stack, the clamping system including a plurality of disc springs. The disc springs are connected together in a bonded and/or force-fitting manner on a plane perpendicular to an axis of rotational symmetry running through the center of the circle described by the disc.