Fuel Cell Polar Plate Forming With In-Press Mark Alignment
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Solution Overview
Problem
The stamping process in the production of metallic bipolar plates for fuel cells causes significant deformation and misalignment of centering holes, leading to reduced manufacturing precision and quality, particularly in cutting operations.
Innovation Solution
A forming process involving a stamping press with a secondary locating tool that forms a mark on the strip during the stamping stage, followed by precise positioning using this mark in a downstream press, ensuring accurate alignment and deformation of fluid channels and perforations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stacking methods are used to assemble membrane electrode assemblies onto a bipolar plate, then the assembly process is simple, but defects such as foreign object contamination and resin protrusion occur frequently
Solution Approach 1:
The membrane electrode assembly is pre-formed within the recess of the bipolar plate before final assembly. The recess is prepared in advance with specific dimensions and shape, and the membrane electrode assembly is inserted and fixed in this pre-prepared space, ensuring proper positioning and preventing defects before the stacking process begins
Solution Approach 2:
A recess structure acts as an intermediary between the membrane electrode assembly and the bipolar plate. This recess serves as a guiding and containing structure that facilitates proper alignment and prevents foreign object contamination and resin protrusion during the stacking process
2Manufacturing precision
If manual or conventional alignment methods are used to position membrane electrode assemblies, then the equipment is simple, but alignment accuracy is insufficient leading to defective products
Solution Approach 1:
A sensor detects the position of the membrane electrode assembly during the stacking process and provides feedback information. Based on this feedback, the system automatically adjusts the positioning to ensure precise alignment between the membrane electrode assembly and the bipolar plate recess, thereby improving manufacturing precision
Solution Approach 2:
The patent replaces manual or simple mechanical alignment methods with an automated system that uses sensors for detection and control systems for positioning. This substitution of mechanical alignment with sensor-based automated positioning improves alignment accuracy while managing equipment complexity
3Productivity
If multiple separate processes are used for stacking, cleaning, and inspection, then each process can be optimized independently, but the overall production efficiency is low
Solution Approach 1:
The patent combines the stacking process, cleaning process, and inspection process into a single integrated forming plant. These previously separate processes are merged into one continuous automated system that performs all operations in sequence without manual intervention between steps, thereby improving overall production efficiency
Solution Approach 2:
The forming plant is designed as a multi-functional system that performs stacking, cleaning, and inspection operations within a single integrated structure. This universal system handles multiple functions that were previously performed by separate equipment, improving productivity while managing system complexity through integration
Data Source
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AI summary
Said method for forming a polar plate (100) involves: - an embossing step (220): - which is carried out by an embossing press (40) comprising an embossing tool (43A) mounted on a slide that undergoes a reciprocating vertical movement, and - during which a network of fluid flow channels (104) is embossed on the strip, - a downstream step (230) that follows the embossing step and is carried out by a downstream press (60). According to the invention: - once the network of channels (104) is embossed on the strip (12), while the strip (12) is kept clamped in the embossing tool (43A), a mark (222) is formed in the strip by means of a marking tool (224) carried by the slide, - during the downstream step (230), the strip is positioned in relation to the downstream press (60) by means of positioning members (238) which are mounted on the downstream press and cooperate with the mark (222).