Bipolar Plate Assembly With Compensating Regions for MEA Thickness Variation

Solution Overview

Problem

Conventional bipolar plates in electrochemical systems are prone to damage due to thickness fluctuations of the membrane electrode assembly, leading to potential breakage and perforation under dynamic pressure and load conditions, especially when the spacing between bipolar plates varies.

Innovation Solution

The design incorporates compensating regions in the distribution or collection regions of the separator plates, where flow channels are formed to create a spacing between the channel bottoms, allowing for tolerance compensation of thickness fluctuations and reducing the risk of damage by preventing direct contact between the separator plates in these regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the separator plates are joined directly against each other in the distribution and collection regions to provide mechanical support and sealing, then the structural stability is improved, but the bipolar plate becomes susceptible to damage from thickness fluctuations of the membrane electrode assembly under dynamic pressure conditions

Engineering Contradiction:

Improvestructural stabilityVSAvoiddamage resistance

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The bipolar plate is divided into two functionally distinct regions: a contact region where separator plates are joined for structural stability, and a non-contact region where separator plates are spaced apart to accommodate thickness fluctuations of the membrane electrode assembly. This segmentation allows each region to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the bipolar plate are designed with different properties: the contact region has direct separator plate contact for mechanical support and sealing, while the non-contact region has spaced separator plates with flow channels to accommodate dimensional changes. This local differentiation optimizes both structural stability and damage resistance.

Inventive Principle:

Principle #3Local quality

2Reliability

If the separator plates are spaced apart to accommodate thickness fluctuations, then the damage resistance is improved, but the mechanical support and sealing effectiveness deteriorates

Engineering Contradiction:

Improvedamage resistanceVSAvoidmechanical support

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The bipolar plate is divided into two functionally distinct regions: a contact region where separator plates are joined for structural stability, and a non-contact region where separator plates are spaced apart to accommodate thickness fluctuations. This segmentation allows each region to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the bipolar plate are designed with different properties: the contact region has direct separator plate contact for mechanical support and sealing, while the non-contact region has spaced separator plates with flow channels to accommodate dimensional changes. This local differentiation optimizes both structural stability and damage resistance.

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If the flow channels are designed with deep embossments for adequate coolant flow, then the cooling efficiency is improved, but the separator plates come into contact under compression, exposing joints and risking breakage

Engineering Contradiction:

Improvecooling efficiencyVSAvoidjoint integrity

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The bipolar plate is divided into two functionally distinct regions: a contact region where separator plates are joined for structural stability, and a non-contact region where separator plates are spaced apart to accommodate thickness fluctuations. This segmentation allows each region to fulfill its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the bipolar plate are designed with different properties: the contact region has direct separator plate contact for mechanical support and sealing, while the non-contact region has spaced separator plates with flow channels to accommodate dimensional changes. This local differentiation optimizes both structural stability and damage resistance.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230395825A1Bipolar plate for an electrochemical system, and assembly of such bipolar plates

Publication Date: 2023.12.07 REINZ DICHTUNGS G M B H

AI summary

A bipolar plate for an electrochemical system, comprising a first separator plate and a second separator plate. The first and the second separator plate each comprising: at least two through-openings, an active region, and a distribution or collection region with structures for guiding a reaction medium between one of the through-openings and the active region. The structures for guiding the reaction medium in the distribution or collection region comprise flow channels for the respective reaction medium, said flow channels being separated from each other by webs. Adjacent to the first through-opening, the separator plates bear directly against each other in a contact plane. The distribution or collection region of the first separator plate and/or the distribution or collection region of the second separator plate have at least one compensating region.