Electrode Plate Laser Notching With Molten Material Removal

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Solution Overview

Problem

Existing laser notching apparatuses for secondary battery electrode plates struggle to efficiently remove molten materials that can cause internal shorts during battery assembly or operation.

Innovation Solution

An electrode plate manufacturing apparatus utilizing a first laser radiation unit for notching the electrode film and a second laser radiation unit, which radiates a second laser beam at an inclined angle to efficiently remove the molten material from the notched area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If laser notching is used to form electrode tabs, then production efficiency is improved and damage to electrode is reduced, but molten material accumulates on the surface causing internal shorts

Engineering Contradiction:

Improveproduction efficiencyVSAvoidinternal short prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A second laser beam is introduced as an intermediary tool to remove the molten material that accumulates during the first laser notching process. This second laser acts as a mediator that cleans the surface without requiring additional mechanical intervention, thus maintaining production efficiency while preventing internal shorts.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces mechanical cleaning methods with a second laser beam to remove molten material. This substitution eliminates the need for physical contact with the electrode surface, maintaining the non-contact advantage of laser processing while effectively removing contaminants that cause internal shorts.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If traditional punching is used to form electrode tabs, then equipment complexity is reduced, but damage to electrode increases and production efficiency decreases

Engineering Contradiction:

Improveequipment complexityVSAvoidelectrode damage

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent replaces mechanical punching with a laser-based notching system that uses light energy to cut the electrode material. This substitution eliminates mechanical contact, preventing electrode damage while achieving the same tab formation function, thus improving reliability without significantly increasing device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Speed

If molten material is not removed after laser notching, then production speed is maintained, but internal short occurs during battery assembly or operation

Engineering Contradiction:

Improveproduction speedVSAvoidinternal short prevention

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent implements a continuous two-stage laser process where the second laser beam continuously removes molten material immediately after the first laser creates the tab. This continuous action ensures that no molten material remains to cause internal shorts, while the entire process occurs in one continuous operation without stopping the production line, thus maintaining production speed.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The second laser beam performs preliminary cleaning of molten material before the electrode enters the battery assembly process. By removing contaminants in advance, the system prevents future internal shorts without requiring additional cleaning steps later in the manufacturing process, thereby maintaining production speed.

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

The apparatus effectively prevents internal shorts by quickly and efficiently removing molten materials, while also enabling the formation of electrode tabs in various shapes without spatial limitations.

Implementation Method 1

a first laser radiation unit (20) that radiates a first laser beam (L1) in a first direction (−Z-axis direction) perpendicular to an electrode film (10) located between rollers of a transfer device to notch at least a portion of the electrode film (10)

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Implementation Method 2

a second laser radiation unit (30) that radiates a second laser beam (L2) to a notched area of the electrode film (10), which is notched by the first laser radiation unit (20), to remove a material of a surface of the electrode film (10) melted by the first laser beam (L1)

Methodology Applied

Scientific EffectLaser heating: Heating

Data Source

PatentUS20250128357A1Electrode plate manufacturing apparatus, electrode plate manufactured using the same, and method thereof

Publication Date: 2025.04.24 PHILENERGY CO LTD

AI summary

The present invention relates to an electrode plate manufacturing apparatus including a first laser radiation unit that radiates a first laser beam in a first direction perpendicular to an electrode film located between rollers of a transfer device to notch at least a portion of the electrode film and a second laser radiation unit that radiates a second laser beam to a notched area of the electrode film, which is notched by the first laser radiation unit, to remove a material of a surface of the electrode film melted by the first laser beam.