Layered Electrode Bonding With Partial Edge Adhesion

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Solution Overview

Problem

Existing methods for producing layered electrode assemblies often result in damage during the adhesion process, leading to degradation of the electrode assembly due to excessive pressing, which affects the integrity and performance of lithium-ion secondary batteries.

Innovation Solution

A technique involving a quadrangular electrode plate and separator configuration where only specific sides of the electrode plates are adhered to the separator, using a thermoplastic layer for thermal adhesion, and an adhesion device with a holding unit and electrode plate adhesion unit that compensates for distance variations and reduces pressing at ends to prevent damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the electrode plate is fully adhered to the separator during the adhesion process, then the bonding strength is improved, but the electrode plate may be damaged due to excessive pressing

Engineering Contradiction:

Improvebonding strengthVSAvoidelectrode assembly integrity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies different pressing forces to different regions of the electrode plate. The central region is pressed with higher force to ensure strong bonding, while the peripheral regions are pressed with lower force to avoid damage. This local differentiation of pressing intensity resolves the contradiction between achieving sufficient bonding strength and preventing electrode plate damage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The adhesion process is segmented into different zones with distinct pressing characteristics. The pressing device divides the electrode plate into multiple adhesion regions, each subjected to appropriate pressing force. This segmentation allows the system to achieve overall bonding while protecting vulnerable areas from excessive stress.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If the pressing force is increased to ensure proper adhesion, then the bonding quality is improved, but the electrode plate may be damaged

Engineering Contradiction:

Improveadhesion qualityVSAvoidelectrode plate damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The pressing force is locally optimized across different regions of the electrode plate. High pressing force is applied only where needed for proper adhesion, while peripheral areas receive reduced force to prevent damage. This local quality approach ensures manufacturing precision without introducing harmful effects.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The pressing device is designed with cushioning mechanisms that prevent excessive force application. By incorporating compliance elements and controlled force distribution, the system cushions against potential damage before it occurs, ensuring high adhesion quality without electrode plate damage.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Stability of the object's composition

If all four sides of the electrode plate are adhered to the separator, then the structural stability is improved, but the risk of damage during adhesion increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidadhesion process damage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

Different sides of the electrode plate are subjected to different adhesion treatments. Some sides are fully adhered to provide structural stability, while other sides are partially adhered or left unadhered to reduce damage risk. This local differentiation resolves the contradiction between stability and damage prevention.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of fully adhering all four sides of the electrode plate, the patent applies partial adhesion to certain sides. This partial action approach provides sufficient structural stability while avoiding the excessive pressing that would cause damage to all edges.

Inventive Principle:

Principle #16Partial or excessive 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 effectively suppresses damage during the adhesion process, ensuring a stable and high-quality layered electrode assembly with improved performance and longevity of lithium-ion secondary batteries.

Implementation Method 1

using a thermoplastic layer for thermal adhesion

Methodology Applied

Scientific EffectThermal adhesion: Heating

Data Source

PatentUS12183891B2Layered electrode body and bonding device for layered electrode body

Publication Date: 2024.12.31 PANASONIC ENERGY CO LTD

AI summary

A layered electrode body manufacturing device comprising: a negative electrode cut drum cuts a negative electrode single plate at a first width, generates a negative electrode plate, and conveys same; a negative electrode heat drum heats the negative electrode plate; a positive electrode cut drum cuts a positive electrode single plate at a second width, generates a positive electrode plate, and conveys same; a positive electrode heat drum heats the positive electrode plate; and a bonding drum which positions the negative electrode plate on a first separator single plate, positions a second separator single plate thereon, and positions and bonds the positive electrode plate thereon. The pressing forces between the bonding drum, and the negative and positive electrode heat drums are adjusted. At least a portion of two sides from the outer edge part of the electrode plate is bonded to a separator, and the other two sides are not.