Cable Battery Spiral Winding Polymer Electrolyte
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Solution Overview
Problem
Cable-type secondary batteries with minimized inner diameters face challenges in electrolyte injection and capacity characteristics due to their compact design, which limits their application in wearable and smart fabric devices.
Innovation Solution
A cable-type secondary battery design featuring a sheet-type outer electrode formed by spiral winding with a polymer electrolyte coating layer, including polar and oxide-based linear polymers, and a support layer to facilitate electrolyte injection and improve flexibility, allowing for woven or sheet-type configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a cable-type secondary battery uses a polymer electrolyte to form an electrolyte layer, then the battery achieves a minimized inner diameter and improved flexibility, but it becomes difficult to inject an electrolyte to the active material of an electrode, resulting in increased resistance and degraded capacity characteristics
Solution Approach 1:
The patent employs a porous polymer electrolyte layer with controlled porosity (30-80%) to enable electrolyte penetration while maintaining structural integrity. The porous structure allows electrolyte to reach the electrode active material effectively, resolving the contradiction between minimized inner diameter and reliable electrolyte injection for maintaining capacity characteristics.
2Volume of moving object
If a cable-type secondary battery uses a polymer electrolyte to form an electrolyte layer, then the battery achieves a minimized inner diameter and improved flexibility, but it results in increased resistance of the battery
Solution Approach 1:
The patent uses a composite structure combining porous polymer electrolyte with conductive additives and optimized electrode materials. This composite approach reduces the overall resistance of the minimized battery structure while maintaining the compact inner diameter, effectively resolving the contradiction between size reduction and resistance control.
3Ease of manufacture
If secondary batteries are manufactured as cylindrical, prismatic or pouch-type batteries, then the batteries achieve stable structure and ease of manufacture, but they require a predetermined space for installation and function as limitations in developing various types of portable systems
Solution Approach 1:
The patent adopts a flexible cable-type structure with thin-film electrodes and polymer electrolyte, replacing traditional rigid cylindrical,prismatic or pouch containers. This flexible design enables the battery to be deformed, woven, or configured in various shapes while maintaining ease of manufacture through continuous processing methods, effectively resolving the contradiction between manufacturing simplicity and adaptability.
Data Source
AI summary
The present disclosure provides a cable-type secondary battery which includes: at least one inner electrode; a separation layer formed to surround the outer surface of the inner electrode and configured to prevent a short of the electrodes; a sheet-type outer electrode surrounding the separation layer or the inner electrode and formed by spiral winding; and a polymer electrolyte coating layer formed to surround the sheet-type outer electrode, wherein the sheet-type outer electrode is formed by spiral winding to avoid an overlap.