Dotted Functional Layer Laminate for Battery Transfer

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Solution Overview

Problem

Conventional laminates for non-aqueous secondary batteries face challenges in achieving a balance between easy peeling of the functional layer from the releasable substrate and strong adhesion to the substrate during transfer, which affects the adhesiveness and close adherence between battery components.

Innovation Solution

A laminate with a functional layer formed in a dotted form on a releasable substrate, where the functional layer is easily peeled and well-adhered to the substrate, utilizing a binder with specific properties and a contact angle difference between the two surfaces to inhibit excessive adhesion and enhance transfer efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the amount of binder in the functional layer is reduced to facilitate peeling from the releasable substrate, then peelability is improved, but adhesiveness to the substrate for secondary battery is lost

Engineering Contradiction:

Improvepeelability of functional layer from releasable substrateVSAvoidadhesiveness of functional layer to substrate for secondary battery

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The functional layer is formed in a dotted form rather than as a continuous layer. This segmentation allows the functional layer to be easily peeled from the releasable substrate while maintaining sufficient adhesiveness to the substrate for secondary battery through the distributed dots of binder material.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The binder is distributed in a dotted pattern rather than uniformly across the entire surface. This creates local concentrations of adhesive material at specific points, providing sufficient bonding strength where needed while leaving other areas with minimal binder content that facilitates easy peeling from the releasable substrate.

Inventive Principle:

Principle #3Local quality

2Strength

If the functional layer is formed as a continuous layer to ensure sufficient adhesion, then adhesiveness is improved, but peeling from the releasable substrate becomes difficult

Engineering Contradiction:

Improveadhesiveness of functional layer to substrate for secondary batteryVSAvoidpeelability of functional layer from releasable substrate

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The continuous functional layer is divided into discrete dotted regions. This segmentation reduces the total contact area between the functional layer and the releasable substrate, making peeling easier while still providing sufficient adhesion through the distributed dots.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of forming a complete continuous layer, only partial dotted regions are formed. This partial action provides just enough adhesive coverage to ensure sufficient bonding to the substrate for secondary battery while facilitating easy peeling from the releasable substrate.

Inventive Principle:

Principle #16Partial or excessive action

3Ease of operation

If the contact angle with water of the releasable substrate is increased to improve peeling, then peelability is improved, but the functional layer may not adhere sufficiently to the substrate for secondary battery

Engineering Contradiction:

Improvepeelability of functional layer from releasable substrateVSAvoidadhesiveness to substrate for secondary battery

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The contact angle with water of the releasable substrate is set to 70° or more to create a surface that facilitates peeling. Combined with the dotted formation of the functional layer, this surface property allows easy peeling while the localized binder dots ensure sufficient adhesion to the substrate for secondary battery.

Inventive Principle:

Principle #3Local quality

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 solution enables efficient transfer and adhesion of the functional layer, improving the balance of peelability and adhesiveness, resulting in enhanced battery component production with improved close adherence and reduced metal deposition on electrodes.

Implementation Method 1

a releasable substrate having a contact angle with water of 70° or more

Methodology Applied

Scientific EffectContact angle with water: Surface Tension

Data Source

PatentUS11613098B2Laminate for non-aqueous secondary battery and method of producing same, roll for non-aqueous secondary battery, and method of producing non-aqueous secondary battery component

Publication Date: 2023.03.28 ZEON CORP

AI summary

Provided is a laminate for a non-aqueous secondary battery that, in transfer of a functional layer onto a substrate for a non-aqueous secondary battery, enables easy peeling of the functional layer from a releasable substrate while also enabling good adhesion of the functional layer to the substrate for a non-aqueous secondary battery. The laminate for a non-aqueous secondary battery includes a releasable substrate and a functional layer containing a binder. The functional layer is formed in a dotted form on a surface A at one side of the releasable substrate.