Bipolar Separator Layered Structure for Electrochemical Reactors

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Solution Overview

Problem

Existing electrochemical reactors face challenges in manufacturing bipolar separators that are both economical and perform satisfactorily, particularly in terms of fluid distribution and cooling efficiency.

Innovation Solution

A bipolar separator is formed by superimposing two distribution plates and two cooling plates, with the cooling plates positioned between the distribution plates, featuring internal conduits for cooling fluid circulation and distribution channels for reactive fluids, made from graphite-based materials, and manufactured using a method involving shaping strips between rollers to create a laminate structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If bipolar separators are manufactured using conventional methods, then manufacturing cost is reduced, but manufacturing precision and performance are insufficient

Engineering Contradiction:

Improvebipolar separator performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The bipolar separator is divided into multiple functional layers including distribution plates with reactive fluid channels and cooling plates with cooling fluid conduits. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall performance requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bipolar separator employs composite construction with different materials for distribution plates and cooling plates, each selected for optimal performance in their respective functions. This composite approach enables simultaneous achievement of fluid distribution efficiency and cooling performance.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If bipolar separators are designed with integrated cooling and distribution functions, then device complexity is reduced, but manufacturing precision requirements increase

Engineering Contradiction:

Improvebipolar separator structureVSAvoidalignment and sealing

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The distribution function and cooling function are merged into a single bipolar separator assembly where cooling plates are positioned between distribution plates. This integration reduces the number of separate components while maintaining precise functional relationships through the layered structure.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cooling plates are nested between the distribution plates in a sandwich structure, with sealing elements positioned within grooves on the cooling plates. This nesting arrangement ensures precise alignment and sealing without requiring complex external fastening mechanisms.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Temperature

If cooling plates are positioned between distribution plates, then cooling efficiency is improved, but manufacturing steps increase

Engineering Contradiction:

Improvecooling efficiencyVSAvoidassembly process

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The cooling channels and distribution channels are pre-formed in the respective plates during manufacturing, with sealing grooves already positioned on the cooling plates. This preliminary preparation of features simplifies the final assembly process despite the multi-layer structure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The cooling plates serve as intermediary elements between the distribution plates, mediating the thermal management function while maintaining the structural integrity of the bipolar separator assembly. The sealing elements on the cooling plates facilitate easy assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This design allows for efficient fluid distribution and cooling, facilitating the production of bipolar separators that are easy to manufacture and achieve satisfactory performance in electrochemical reactors, such as fuel cells and electrolyzers, with improved operational efficiency and cost-effectiveness.

Implementation Method 1

the cooling plates defining internal conduits for the circulation of a cooling fluid

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

the outer face of each distribution plate being provided with distribution channels for the flow of a reactive fluid

Methodology Applied

Scientific EffectFluid flow through channels:

Implementation Method 3

each membrane electrode assembly is in the form of a laminate comprising an ion exchange membrane inserted between two electrodes

Methodology Applied

Scientific EffectIon exchange: Ion Exchange

Data Source

PatentUS20220384821A1Bipolar separator for electrochemical reactor

Publication Date: 2022.12.01 ALSTOM HYDROGENE SAS

AI summary

The bipolar separator is formed by the superimposition of two distribution plates and two cooling plates, the two cooling plates being arranged between the two distribution plates, each distribution plate having an outer face and an inner face, the outer face of each distribution plate being provided with distribution channels for the flow of a reactive fluid, the cooling plates defining internal conduits for the circulation of a cooling fluid.