Bipolar Plate Groove Base Elevation for Stamping Integrity

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Solution Overview

Problem

Conventional bipolar plates in electrochemical systems suffer from material thinning and cracking due to excessive reshaping during the stamping process, leading to reduced durability and increased waste in production.

Innovation Solution

The bipolar plate design features grooves with a rising groove base towards the contact surface in transition regions, reducing the height difference and reshaping stress, along with specific curvature radii to minimize material thinning and cracking, and merging grooves with controlled radii to maintain structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional stamping process is used to form grooves in bipolar plates, then coolant channels can be formed, but material thinning and cracking occur due to excessive reshaping

Engineering Contradiction:

Improvecoolant channel formationVSAvoidplate durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The groove base is preliminarily raised in the transition region before the final stamping operation. This preliminary action reduces the height difference that needs to be bridged during stamping, thereby minimizing material reshaping, preventing excessive thinning and cracking, while still allowing coolant channels to be formed effectively

Inventive Principle:

Principle #10Preliminary action

2Strength

If grooves are formed with large stamping radius to ensure smooth transitions, then structural integrity improves, but material thinning increases due to great reshaping

Engineering Contradiction:

Improvestructural integrityVSAvoidmaterial thinning

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

By preliminarily raising the groove base in the transition region, the patent reduces the amount of reshaping required during final stamping. This allows the use of appropriate stamping radii that maintain structural integrity through smooth transitions while minimizing material thinning, as the baseline height difference has already been reduced

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The groove base elevation is applied locally only in the transition region where grooves merge with distribution or collection regions. This localized modification maintains structural integrity in critical areas while minimizing overall material reshaping and thinning, as other regions of the plate remain unaffected

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If grooves end at transition regions to simplify manufacturing, then production complexity reduces, but cracks occur due to large degree of reshaping

Engineering Contradiction:

Improveproduction simplicityVSAvoidgroove quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The groove base is preliminarily raised in the transition region before final stamping. This preliminary action ensures that even when grooves end at transition regions for manufacturing simplicity, the reduced height difference prevents excessive reshaping, material thinning, and crack formation, thereby maintaining groove quality

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230253577A1Bipolar plate and fuel cell

Publication Date: 2023.08.10 REINZ DICHTUNGS G M B H

AI summary

A bipolar plate having an anode plate and a cathode plate and a contact surface between the two surfaces. In a transition region, at least one first groove ends and/or a second groove ends or at least one first groove merges into a second groove, wherein the grooves guide fluid. In at least one of the first grooves and second grooves, the groove base rises such that the distance of the groove base from the contact surface decreases.