Patterned Plasma Coating on Separation Sheets for Battery Adhesion

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Solution Overview

Problem

Existing methods for manufacturing electrode assemblies in secondary batteries deteriorate electrolyte impregnation and gas discharge properties due to the formation of adhesive layers on the entire surface of separation sheets, compromising adhesion between the separation sheet and radical units.

Innovation Solution

A plasma generation device forms a patterned adhesive layer on the separation sheet by using a roller part with a transfer roller and plasma generator to create a patterned adhesive layer, improving adhesion between the separation sheet and radical units while enhancing electrolyte impregnation and gas discharge properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If an adhesive layer is formed on the entire surface of the separation sheet, then adhesion between the separation sheet and radical unit is improved, but electrolyte impregnation property and gas discharge property are significantly deteriorated

Engineering Contradiction:

ImproveadhesionVSAvoidelectrolyte impregnation property

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The adhesive layer is applied selectively to specific regions of the separation sheet rather than the entire surface. The plasma generation device creates a patterned adhesive layer that adheres to the radical unit only at designated areas, allowing the remaining portions of the separation sheet to maintain their natural properties for electrolyte impregnation and gas discharge functions.

Inventive Principle:

Principle #3Local quality

2Strength

If an adhesive layer is formed on the entire surface of the separation sheet, then adhesion between the separation sheet and radical unit is improved, but gas discharge property is significantly deteriorated

Engineering Contradiction:

ImproveadhesionVSAvoidgas discharge property

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

3Reliability

If a patterned adhesive layer is formed on the separation sheet, then adhesion, electrolyte impregnation property, and gas discharge property are improved, but device complexity increases

Engineering Contradiction:

Improveelectrolyte impregnation propertyVSAvoidplasma generation device structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The plasma generation device is divided into multiple electrode members arranged in a specific pattern, with each electrode member corresponding to a specific region of the separation sheet. This segmentation allows independent control of adhesive layer formation in different areas, achieving the desired patterned structure while maintaining manageable device complexity through modular design.

Inventive Principle:

Principle #1Segmentation

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

The patterned adhesive layer improves adhesion between the separation sheet and radical units, while simultaneously enhancing electrolyte impregnation and gas discharge properties, resulting in a high-quality electrode assembly.

Implementation Method 1

a plasma generator including a main body disposed to be spaced apart from the transfer roller and provided to be elongated in a width direction of the separation sheet, which is perpendicular to a transfer direction of the separation sheet, a plurality of electrode members disposed in the width direction of the separation sheet and configured to generate plasma on only a surface of the separation sheet

Methodology Applied

Scientific EffectPlasma: Plasma

Data Source

PatentUS12552150B2Plasma generation device and facility for manufacturing electrode assembly including the same

Publication Date: 2026.02.17 LG ENERGY SOLUTION LTD

AI summary

A plasma generation device forms a patterned adhesive layer on a separation sheet surface and includes a roller part and plasma generator. The roller part includes a transfer roller for transferring the separation sheet and a metal member embedded in the transfer roller. The plasma generator includes a main body, electrode members, and a guide member. The main body is configured to be spaced from the transfer roller and elongated in a width direction perpendicular to a transfer direction of the separation sheet. The electrode members are disposed in the width direction and generate plasma on only a separation sheet surface disposed facing the metal member to form the patterned adhesive layer. The guide member fixes the electrode members to the main body and is detachably coupled to the main body to fix the electrode members to or separate the electrode members from the main body at the same time.