Folded Sheet Metal Clamp for Reliable Bipolar Plate Contact
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Solution Overview
Problem
Existing electrical contacting elements for bipolar plates in fuel cell systems lack reliability and versatility, particularly in densely stacked configurations, where they fail to ensure consistent contact and are difficult to assemble efficiently.
Innovation Solution
A sheet metal clip with a folded U-shape design, featuring two planar clamp parts connected by a linear region, which provides spring-elastic properties for reliable contact and easy assembly, even in densely stacked fuel cell configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrical contacting elements are used for bipolar plates in fuel cell systems, then assembly is simpler with conventional designs, but process reliability is insufficient and contact consistency fails under densely stacked conditions
Solution Approach 1:
The contacting element is divided into two separate planar clamp parts (first and second clamp parts) that can be independently positioned and adjusted. This segmentation allows each clamp part to independently contact the bipolar plate, ensuring consistent contact even in densely stacked configurations while maintaining assembly feasibility through modular installation
Solution Approach 2:
The contacting element transitions from a conventional single-plane design to a three-dimensional structure with clamp parts extending in different spatial dimensions. The first clamp part extends in a first direction while the second clamp part extends in a second direction, creating a multi-dimensional contact configuration that ensures reliable electrical contact under stacked fuel cell plates
2Volume of moving object
If densely stacked bipolar plates are used to increase system compactness, then installation space is reduced, but contact consistency and assembly reliability deteriorate
Solution Approach 1:
Different regions of the contacting element are designed with specialized functions: the first clamp part is optimized for contact in one direction while the second clamp part is optimized for contact in another direction. This local differentiation ensures that each region of the bipolar plate surface receives appropriate contact pressure and electrical connection, maintaining contact consistency even when plates are densely stacked with minimal clearance
3Ease of operation
If manual assembly methods are used for contacting elements, then assembly flexibility is maintained, but productivity and assembly efficiency are reduced
Solution Approach 1:
The contacting element is designed with self-aligning features where the first and second clamp parts automatically position themselves relative to the bipolar plate during assembly. The spring-loaded mechanism provides self-adjusting contact pressure, eliminating the need for complex alignment procedures or specialized assembly tools, thereby enabling both manual flexibility and automated high-speed assembly
4Reliability
If spring-loaded clamp parts are used to ensure consistent contact, then contact reliability is improved, but manufacturing complexity and production difficulty increase
Solution Approach 1:
The spring constant and preload force of the spring-loaded clamp parts are carefully selected to provide sufficient contact pressure for reliable electrical contact while remaining within the elastic deformation limits of the sheet material. This parameter optimization ensures that the clamp parts can be manufactured using standard sheet metal forming processes without requiring specialized high-pressure spring components, thereby maintaining ease of manufacture while achieving contact reliability
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 sheet metal clip ensures high process reliability and efficient assembly, maintaining consistent contact with bipolar plates while requiring minimal additional installation space, thus enhancing the performance and efficiency of fuel cell systems.
Implementation Method 1
Due to the spring-elastic properties of the sheet metal clamp, the planar clamp parts are spring-loaded against each other
Data Source
AI summary
An electrical contacting element for a bipolar plate is disclosed. The contacting element has the form of a folded sheet metal clamp, wherein a planar lower clamp part is integrally connected to a likewise planar upper clamp part by a connecting region that is linear when viewed from above, and is spring-loaded against the upper clamp part. The side lines that belong to the planar clamp parts and are opposite the connecting region are designed in such a way that, both when the bottom side of the sheet metal clamp is viewed from above and when the top side of the sheet metal clamp is viewed from above, one of the clamp parts is partially covered by the other clamp part.