Electrode Sheet Cutting via Support Layer Inversion

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Solution Overview

Problem

The existing methods for manufacturing electrode sheets, particularly in fuel cells, face challenges such as deformation, chipping of the active layer, and contamination due to compressive stress and burrs generated during the cutting process, which affect the quality and integrity of the electrode sheets.

Innovation Solution

A method and apparatus where the cutting blade is pressed into the sheet body from the side of the support layer, generating tensile stress in the active layer and preventing burrs from protruding, while using protective films and back sheets to manage the cutting process and prevent contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the cutting blade is pressed from the side of the active layer, then the cutting process is simple, but the active layer becomes deformed or chipped off due to compressive stress

Engineering Contradiction:

Improvecutting process simplicityVSAvoidactive layer integrity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The cutting direction is inverted from pressing the blade from the active layer side to pressing from the support layer side. This reversal allows the support layer to absorb compressive stress and generate tensile stress in the active layer, preventing deformation and chipping while maintaining cutting effectiveness.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The support layer acts as an intermediary between the cutting blade and the active layer. By pressing the blade through the support layer, the support layer mediates the stress distribution, converting compressive stress into tensile stress that prevents active layer damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the cutting blade is pressed into the sheet body, then cutting is achieved, but burrs are generated in the support layer that may protrude outwardly

Engineering Contradiction:

Improvecutting efficiencyVSAvoidsurface quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The burrs generated in the support layer during cutting are converted from a harmful factor into a beneficial one. By pressing from the support layer side, burrs are generated inside the support layer rather than on the active layer surface, and the tensile stress prevents them from protruding, thus eliminating the harmful effect while maintaining cutting efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If punching is performed on the sheet body, then the electrode sheet is formed, but the surface of the active layer may become contaminated in the conveying step

Engineering Contradiction:

Improveproduction throughputVSAvoidactive layer surface cleanliness

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The cutting is performed preliminarily from the support layer side, creating a clean surface on the active layer before the conveying step. This preliminary action prevents contamination during subsequent handling and conveying operations.

Inventive Principle:

Principle #10Preliminary action

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 approach enables high-quality cutting of the active layer, suppresses deformation and chipping, and prevents burrs from protruding, enhancing the productivity and performance of electrode sheets by maintaining the integrity of the active layer and preventing contamination.

Implementation Method 1

a tensile stress is generated on a portion of the active layer that is pressed by the cutting blade

Methodology Applied

Scientific EffectStress:

Implementation Method 2

the support layer becomes separated from the cutting blade, and then accompanying separation of the support layer from the cutting blade

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS11508950B2Electrode sheet manufacturing method and electrode sheet manufacturing apparatus

Publication Date: 2022.11.22 TORAY ENG CO LTD

AI summary

A method of manufacturing an electrode sheet by using an electrode sheet manufacturing apparatus for manufacturing the electrode sheet includes a feeding step of feeding out a sheet body from a roll on which the sheet body is wound, the sheet body including an active layer containing a catalyst laminated on a support layer, and a cutting step of forming the electrode sheet by punching the sheet body by pressing a cutting blade from a side of the support layer against the sheet body that was fed out in the feeding step.