Flexible Battery Connecting Member With Fewer Peel-Prone Interfaces

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Solution Overview

Problem

Existing flexible batteries suffer from a relatively short fatigue life due to the peeling-off of interfaces between layers in their connecting members during repeated bending, which limits their flexibility and durability.

Innovation Solution

A connecting member for flexible batteries is designed with a reduced number of contact interfaces by directly forming a flexible conductive layer on a polymer layer and adding a bonding layer, followed by a second polymer layer, enhancing adhesion and reducing the risk of layer separation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple layers are stacked in the connecting member, then electrical conductivity and structural complexity are improved, but the number of contact interfaces increases leading to layer peeling during bending

Engineering Contradiction:

Improvefatigue lifeVSAvoidnumber of contact interfaces

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the flexible conductive layer and the first polymer layer into a single integrated structure where the conductive layer is formed directly on the polymer layer surface. This reduces the number of separate contact interfaces while maintaining electrical conductivity and structural integrity during bending cycles.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses composite materials by forming a flexible conductive layer (containing metal particles, conductive polymer, or carbon material) on the polymer layer. This composite structure provides both electrical conductivity and mechanical flexibility, reducing the need for additional protective layers and contact interfaces.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional multi-layer structure is used, then electrical conductivity is achieved, but adhesion between layers deteriorates during repeated bending

Engineering Contradiction:

Improveadhesion strengthVSAvoidbending cycle life

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent applies preliminary action by forming the flexible conductive layer directly on the polymer layer surface before any bonding operations. This preliminary formation ensures strong adhesion from the start, preventing layer separation during subsequent bending cycles and extending the battery's operational life.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The flexible conductive layer serves as an intermediary between the polymer layer and the bonding layer, providing both electrical conductivity and mechanical adhesion. This intermediary structure prevents direct contact between the bonding layer and polymer layer, reducing stress concentration and improving overall adhesion during bending.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12519184B2Connecting member, flexible battery, electronic device, and manufacturing method

Publication Date: 2026.01.06 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a connecting member for a flexible battery, a flexible battery, an electronic device, and a manufacturing method. The connecting member includes: a first polymer layer; a flexible conductive layer on a surface of the first polymer layer, the flexible conductive layer being in direct contact with the first polymer layer; a bonding layer on a side of the flexible conductive layer away from the first polymer layer; and a second polymer layer on a side of the bonding layer away from the flexible conductive layer.