Electrode Plate Pattern Coating With Peelable Adhesive Film

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Solution Overview

Problem

Conventional methods for manufacturing electrode plates for secondary batteries face challenges in achieving high coating speed, forming accurate electrode patterns, and maximizing battery capacity and energy density due to discontinuous coating processes that are slow and difficult to synchronize at higher speeds.

Innovation Solution

A method involving the use of adhesive films attached to non-coated areas on the electrode current collector sheet, followed by consecutive coating and heat-drying to reduce adhesive force, allowing easy peeling and retrieval of the adhesive film, enabling continuous pattern formation and exposing non-coated parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If intermittent coating is used to form non-coated parts, then electrode patterns can be formed, but coating speed and productivity decrease

Engineering Contradiction:

Improveelectrode pattern formationVSAvoidcoating speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

Adhesive films are attached to the current collector sheet in advance at positions where non-coated parts are needed before the coating process begins. This preliminary placement of adhesive films eliminates the need to interrupt the coating process, allowing continuous coating while still forming the required electrode patterns.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Adhesive films serve as an intermediary substance that temporarily occupies spaces where electrode slurry should not be applied. These films act as a mediator between the coating process and the final electrode pattern, enabling continuous coating by providing a physical barrier that prevents slurry adhesion in non-coated areas.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If non-coated parts are formed between coated parts, then electrode assembly terminals can be created, but battery capacity and energy density decrease

Engineering Contradiction:

Improveterminal formationVSAvoidbattery capacity

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

Adhesive films are selectively attached only at specific positions where terminals are needed, rather than creating broad non-coated areas. This localized approach maintains electrode slurry coating in most regions, preserving battery capacity while still enabling terminal formation where the adhesive films are placed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The current collector sheet is divided into coated regions and non-coated regions through selective adhesive film placement. This segmentation allows the electrode to be divided into active coating areas for energy storage and terminal areas for electrical connection, optimizing both battery capacity and ease of assembly.

Inventive Principle:

Principle #1Segmentation

3Productivity

If adhesive films are used for pattern coating, then continuous coating is enabled, but additional process steps are added

Engineering Contradiction:

Improvecoating continuityVSAvoidprocess steps

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The attachment of adhesive films and the coating process are merged into an integrated workflow where adhesive films are placed on the current collector sheet and then the entire sheet undergoes continuous coating. This combination eliminates the need for separate intermittent coating operations while the subsequent peeling step removes the adhesive films to reveal the final electrode pattern.

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 approach significantly improves coating speed, increases battery capacity and energy density by enlarging the coated area, and enhances productivity through automated peeling and retrieval of adhesive films.

Implementation Method 1

heating and drying the electrode slurry; and peeling the adhesive film from the electrode current collector sheet and retrieving the adhesive film. Herein, an adhesive force of the adhesive film is reduced by the heating and drying of the electrode slurry

Methodology Applied

Scientific EffectHeat: Heating

Data Source

PatentUS12609291B2Method for manufacturing electrode plate for secondary battery, and electrode plate for secondary battery

Publication Date: 2026.04.21 LG ENERGY SOLUTION LTD

AI summary

A method for manufacturing an electrode plate for a secondary battery, by performing a pattern-coating to have a coated part, on which an electrode slurry has been coated, and a non-coated part, on which the electrode slurry has not been coated, on an electrode current collector sheet, including: attaching at least one adhesive film on at least one portion of the non-coated part on the electrode current collector sheet; consecutively coating an electrode slurry on the electrode current collector sheet including the adhesive-film-attached portion; heating and drying the electrode slurry; and peeling the adhesive film from the electrode current collector sheet and retrieving the adhesive film.