Electrode Rolling Line Reconnection After Coating Edge Breakage

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Solution Overview

Problem

The existing battery manufacturing process is prone to electrode breakage during the rolling process due to stress concentration at the interface between coated and uncoated regions, leading to operational interruptions and reduced productivity.

Innovation Solution

A battery manufacturing device equipped with tension sensors and stoppers that detect and respond to tension abnormalities, allowing broken electrodes to be reconnected without stopping the manufacturing process by using moving rollers to guide and fix the broken sections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a rolling process is performed to increase the density of active material, then the energy density of the battery is improved, but stress concentration occurs at the interface between coated and uncoated regions causing electrode breakage

Engineering Contradiction:

Improvedensity of active materialVSAvoidelectrode integrity

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The patent applies preliminary protective action by positioning stoppers at predetermined locations where electrode breakage is likely to occur during rolling. These stoppers are placed before the breaking event happens, creating a safety mechanism that prevents the electrode from detaching when stress concentration causes breakage at the interface between coated and uncoated regions.

Inventive Principle:

Principle #10Preliminary action

2Ease of repair

If the manufacturing process is stopped to reconnect broken electrodes, then the electrode can be properly reconnected, but the productivity and operation rate of the manufacturing equipment are significantly deteriorated

Engineering Contradiction:

Improveelectrode reconnectionVSAvoidmanufacturing operation rate

Core Design Contradiction:

Ease of repairVSProductivity

Solution Approach 1:

The patent implements beforehand cushioning by providing stoppers that prevent the electrode from completely detaching when breakage occurs. The stoppers act as a cushioning mechanism that maintains the electrode in a manageable state, allowing operators to reconnect broken electrodes without stopping the manufacturing process, thus protecting against productivity loss.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The stoppers serve as intermediary elements between the broken electrode sections and the manufacturing process. They mediate the situation by holding the electrode in place and preventing complete separation, enabling continuous operation while facilitating easy reconnection of broken sections.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If stoppers are positioned to prevent electrode breakage, then electrode detachment is prevented, but the device complexity increases due to additional components

Engineering Contradiction:

Improveelectrode stabilityVSAvoidmanufacturing device structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by positioning stoppers only at specific critical locations where electrode breakage is most likely to occur during the rolling process, rather than providing continuous support along the entire electrode path. This targeted approach maintains electrode stability where needed while minimizing the addition of components, thus limiting the increase in device complexity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3764430B1Battery manufacturing device and battery manufacturing method using the same

Publication Date: 2026.01.14 LG ENERGY SOLUTION LTD

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AI summary

The present invention relates to a battery manufacturing device including: a fixed roller that moves an electrode where an active material is applied; a roller that rolls the electrode; and a stopper that is disposed between the fixed roller and the roller, and when the electrode is disconnected, moves the disconnected electrode.