Bipolar Plate Polymer Anchoring for Precise Fuel Cell Stacking

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Solution Overview

Problem

Existing electrochemical cells, particularly fuel cells, face challenges in securing membrane-electrode assemblies and bipolar plates during stacking, leading to potential slippage and misalignment, which affects the precision and functionality of the cell stack.

Innovation Solution

Incorporating a polymeric connecting element made from thermoplastic polymers like PEN, which is melted or materially bonded to the membrane-electrode assembly's frame structure, providing a positive-locking connection with the bipolar plate, and optionally using different materials for sealing contours to enhance sealing and mechanical stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional stacking methods are used without specialized connecting elements, then the stacking process is simpler, but slippage and misalignment occur between bipolar plates and membrane-electrode assemblies

Engineering Contradiction:

Improveposition accuracyVSAvoidstacking process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The connecting elements are pre-integrated into the bipolar plate structure before stacking. These elements protrude from the bipolar plate surface and are designed to engage with the membrane-electrode assembly frame structure in advance, ensuring precise positioning is established before the actual stacking operation occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The connecting elements serve as intermediary components between the bipolar plate and the membrane-electrode assembly. Made from thermoplastic material, they act as a mediator that can be melted to create a positive-locking connection, transferring transverse forces and preventing slippage while maintaining alignment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If connecting elements are anchored in recesses of the bipolar plate, then transverse force transfer capability increases, but the bipolar plate structure becomes more complex

Engineering Contradiction:

Improvetransverse force transferVSAvoidbipolar plate structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The bipolar plate is segmented with multiple recesses distributed across its surface, each accommodating a connecting element. This segmentation allows the plate to maintain structural integrity while providing multiple discrete anchoring points that collectively enhance transverse force transfer capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connecting elements are made from thermoplastic polymer material that can be melted to form a composite connection with the membrane-electrode assembly frame structure. This composite approach creates a strong mechanical bond that significantly improves transverse force transfer.

Inventive Principle:

Principle #40Composite materials

3Strength

If the same thermoplastic material is used for both the connecting element and the frame structure film, then bonding strength increases, but material selection becomes more restricted

Engineering Contradiction:

Improvebonding strengthVSAvoidmaterial selection flexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The connecting element and the frame structure film are both made from the same thermoplastic polymer material (such as PEN), creating homogeneous materials that can be melted together to form a strong, unified bond. This material homogeneity ensures optimal bonding strength and compatibility.

Inventive Principle:

Principle #33Homogeneity

4Reliability

If sealing contours are used to surround active surfaces and distributor openings, then sealing effectiveness improves, but the risk of slippage increases without additional connecting elements

Engineering Contradiction:

Improvesealing effectivenessVSAvoidposition accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The sealing contour and the connecting element are merged into a single integrated structure. The sealing contour is formed from the same thermoplastic material as the connecting element, creating a dual-function component that provides both sealing effectiveness and anti-slippage capability through its anchoring in bipolar plate recesses.

Inventive Principle:

Principle #5Merging (Combining)

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 solution ensures precise positioning and secure stacking of electrochemical cells by transferring high transverse forces and preventing slippage, while maintaining the integrity of functional surfaces and sealing effectiveness between the bipolar plates and membrane-electrode assemblies.

Implementation Method 1

The connecting element can subsequently be melted or materially bonded to the membrane-electrode assembly, in particular to a film of a frame structure of the membrane-electrode arrangement

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 2

the connecting element is preferably formed from a thermoplastic polymer, for example PEN (polyethylene naphthalate)

Methodology Applied

Scientific EffectThermal bonding: Welding

Data Source

PatentUS20240047709A1Bipolar plate, electrochemical cell, and process for manufacturing an electrochemical cell

Publication Date: 2024.02.08 POWERCELL SWEDEN AB

AI summary

Disclosed is a bipolar plate (20) for an electrochemical cell (100), in particular a fuel cell. The bipolar plate (20) includes at least one polymeric connecting element (21) for connection to a membrane-electrode assembly (1).