Cable-Type Battery Hollow Core Electrolyte Penetration
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Solution Overview
Problem
Conventional secondary batteries face limitations in shape adaptability and flexibility, with existing linear batteries exhibiting poor flexibility and electrolyte inflow issues, leading to increased resistance and deteriorated capacity and cycle characteristics.
Innovation Solution
A cable-type secondary battery design featuring a lithium ion supplying core with a hollow inner electrode support, allowing easy electrolyte penetration, and including inner and outer electrodes with current collectors and active material layers, along with a separation layer to prevent short circuits, facilitating lithium ion supply and exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer electrolyte is used to form an electrolyte layer in a linear battery, then the battery structure is formed, but the electrolyte inflow into electrode active material is difficult, increasing resistance and deteriorating capacity and cycle characteristics
Solution Approach 1:
The patent employs a porous polymer electrolyte membrane with controlled porosity (30-70%) to facilitate electrolyte distribution. The porous structure allows electrolyte to penetrate effectively into electrode active materials while maintaining mechanical integrity, resolving the contradiction between forming a stable battery structure and enabling easy electrolyte inflow.
Solution Approach 2:
The patent optimizes the thickness of the polymer electrolyte layer (5-50 μm) and controls the porosity parameters to balance electrolyte flow resistance with structural stability. By adjusting these parameters, the patent achieves both effective electrolyte distribution and maintenance of capacity and cycle characteristics.
2Adaptability or versatility
If conventional cylindrical, prismatic, or pouch shapes are used for secondary batteries, then the fabrication process is standardized, but the shape adaptability for various mobile devices is limited
Solution Approach 1:
The patent segments the battery into modular components (electrode assembly, polymer electrolyte layer, current collectors) that can be independently manufactured and then assembled in various configurations. This segmentation enables the battery to adapt to different shapes while maintaining a standardized fabrication process for each module.
Solution Approach 2:
The patent employs flexible current collectors and a polymer electrolyte membrane that can be bent and shaped without compromising structural integrity. This dynamic flexibility allows the battery to adapt to various device shapes while using standardized fabrication processes for the components themselves.
3Ease of manufacture
If the electrolyte layer thickness is increased to improve electrolyte distribution, then electrolyte inflow is enhanced, but the battery resistance increases and capacity deteriorates
Solution Approach 1:
The patent uses a porous polymer electrolyte membrane with optimized porosity (30-70%) that enables effective electrolyte distribution throughout the electrode structure without requiring excessive thickness. The porous network provides multiple pathways for electrolyte flow, achieving good distribution with thinner layers (5-50 μm) that maintain low resistance and high capacity.
4Adaptability or versatility
If a linear battery structure is used to achieve high length-to-cross-sectional diameter ratio, then shape adaptability is improved, but flexibility is poor
Solution Approach 1:
The patent employs thin-film polymer electrolyte membranes (5-50 μm thickness) and flexible current collectors that provide both the linear shape configuration and the necessary flexibility. These thin-film structures can be bent and deformed without breaking, combining shape adaptability with mechanical flexibility.
Solution Approach 2:
The patent creates a composite structure combining the polymer electrolyte membrane with porous electrodes and flexible current collectors. This composite design provides both the linear geometry for shape adaptability and the flexible properties needed for mechanical durability, resolving the contradiction between linear structure and flexibility.
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 cable-type secondary battery achieves superior capacity and cycle characteristics while enhancing flexibility, allowing for easier shape changes without the need for excessive electrolyte layer thickness, thus improving overall battery performance.
Implementation Method 1
an inner electrode support of a hollow structure formed to surround an outer surface of the lithium ion supplying core
Data Source
AI summary
Provided is a cable-type secondary battery extending longitudinally including a lithium ion supplying core comprising an electrolyte, an inner electrode support of a hollow structure formed to surround an outer surface of the lithium ion supplying core, an inner electrode formed on a surface of the inner electrode support and including an inner current collector and an inner electrode active material, a separation layer formed to surround an outer surface of the inner electrode to prevent a short circuit between electrodes, and an outer electrode formed to surround an outer surface of the separation layer and including an outer electrode active material layer and an outer current collector.