Cable-Type Battery Electrode Design for Flexibility and Reliability

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Solution Overview

Problem

Cable-type secondary batteries face degradation in life characteristics and output due to increased intervals between electrodes, limiting their flexibility and performance.

Innovation Solution

A cable-type secondary battery design featuring a cable-type electrode assembly with a sheet-form outer electrode that surrounds the inner electrode assembly, minimizing the distance between electrodes through a specific circumference-to-width ratio, and incorporating a conductive material coating layer and porous supporting layers to enhance ion conductivity and flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the cable-type secondary battery is designed with high flexibility for frequent deformation, then the interval between electrode and separation layer increases, but this causes degradation of life characteristics and output

Engineering Contradiction:

ImproveflexibilityVSAvoidlife characteristics and output

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies this principle by using a thin separation layer that maintains effective ion conduction while minimizing the distance between electrodes. The separation layer is designed as a thin film structure that provides both flexibility for deformation and sufficient barrier function to prevent short circuits, thus resolving the contradiction between flexibility and reliability

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent changes the thickness parameter of the separation layer to optimize performance. By controlling the separation layer thickness to be within a specific range (1-10 μm), the patent achieves both flexibility for frequent deformation and maintained ion conduction efficiency, preventing degradation of life characteristics and output

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the separation layer thickness is reduced to maintain close contact between electrodes, then ion conduction efficiency improves, but the risk of short-circuit between electrodes increases

Engineering Contradiction:

Improveion conduction efficiencyVSAvoidshort-circuit risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a thin film separation layer with optimized thickness (1-10 μm) that maintains close contact between electrodes for efficient ion conduction while still providing sufficient physical barrier function to prevent direct contact and short circuits between electrodes

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The separation layer is constructed using composite materials that combine excellent ion conduction properties with sufficient mechanical strength and insulation properties. This composite structure enables the thin separation layer to simultaneously achieve high ion conduction efficiency and adequate short-circuit prevention

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS10586968B2Cable-type secondary battery

Publication Date: 2020.03.10 LG ENERGY SOLUTION LTD

AI summary

The present disclosure provides a cable-type secondary battery which includes: a cable-type electrode assembly comprising an inner electrode and a separation layer surrounding the outer surface of the inner electrode to prevent a short-circuit between electrodes; and a sheet-form outer electrode surrounding the outer surface of the cable-type electrode assembly, and satisfies the mathematical formula of C≥W (wherein C is the circumference of the section perpendicular to the longitudinal direction of the cable-type electrode assembly, and W is the width of the sheet-form outer electrode).