Separator Plate Channel Geometry to Prevent End Cracking
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Solution Overview
Problem
Conventional separator plates in electrochemical systems experience material thinning and cracking at channel ends due to embossing processes, leading to reduced service life and increased reject rates during manufacturing.
Innovation Solution
The separator plate design features channels with a constant depth in one region and a decreasing depth in the transition region, where the channel base continuation is curved, maintaining parallel surface lines to reduce material curvature and stress, thereby minimizing material thinning and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional embossing processes are used to create channels in separator plates, then fluid guidance and media flow are enabled, but material thinning and cracking occur at channel ends leading to reduced service life and increased manufacturing reject rates
Solution Approach 1:
The invention changes the geometric parameters of the channel, specifically introducing a transition region with gradually varying depth from the channel opening to the channel base. This gradual parameter change reduces stress concentration and prevents material thinning and cracking at the channel ends, thereby improving service life while maintaining manufacturability through embossing processes
2Productivity
If conventional embossing processes are used to create channels in separator plates, then fluid guidance and media flow are enabled, but material stresses increase leading to cracking and reduced manufacturing yield
Solution Approach 1:
The invention modifies the channel geometry by introducing a transition region with gradually varying depth, which reduces material stresses during embossing. This parameter change prevents cracking and reduces reject rates, thereby improving manufacturing yield while maintaining the necessary fluid guidance functionality
3Device complexity
If channel depth is constant throughout the channel length, then manufacturing is simplified, but material stress concentration occurs at channel ends leading to cracking
Solution Approach 1:
The invention introduces a transition region with gradually varying channel depth, which increases geometric complexity but significantly improves material integrity by reducing stress concentration at channel ends. This parameter change prevents cracking and ensures higher manufacturing precision while maintaining reasonable manufacturing complexity
Data Source
AI summary
A separator plate is disclosed for an electrochemical system. The plate comprises a multitude of mutually parallel and adjacent channels that are designed to guide a fluid at least along a region of the separator plate, wherein the channels each have a depth, a longitudinal extent, a channel base and two sidewalls, wherein the following conditions apply to at least one of the channels: the depth of the channel in a first region of the channel is essentially constant along the longitudinal extent, the channel base in the first region of the channel is essentially flat and the depth of the channel in a transition region of the channel that adjoins the first region decreases along the longitudinal extent, as a result of which a channel base continuation in the transition region is curved.