Cable Battery Winding Core Guide Portions Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cable-type secondary batteries face challenges with flexibility, deformation, and quality due to poor electrode alignment, high resistance, and electrolyte distribution issues, which limit their capacity and cycle characteristics.
Innovation Solution
The design incorporates a winding core with spiral guide portions, sheet-type electrodes, and a lithium ion supplying core portion with an open structure to facilitate electrolyte infiltration and maintain alignment, using sheet-type current collectors to reduce resistance and enhance flexibility, allowing for easy deformation and high-capacity performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a polymer electrolyte is used to form an electrolyte layer in a cable-type secondary battery, then the battery structure is simplified, but it becomes difficult to inject electrolyte to the active material of the electrode, resulting in increased resistance and degradation of capacity characteristics
Solution Approach 1:
The battery structure is segmented into distinct functional regions: a core portion containing the electrolyte layer, and electrode layers wrapped around it. This segmentation allows the electrolyte to be pre-loaded in the core where it can effectively contact the electrode active materials, resolving the injection difficulty while maintaining structural simplicity
Solution Approach 2:
The core portion acts as an intermediary structure that facilitates electrolyte distribution. It serves as a reservoir and distribution channel, ensuring electrolyte reaches the electrode active materials effectively, thus preventing increased resistance and capacity degradation
2Ease of manufacture
If a non-uniform gap is generated between each electrode and the separator, then the battery structure is formed, but electrolyte cannot be introduced to the outer electrode active material layer smoothly, resulting in degradation of battery quality
Solution Approach 1:
The electrolyte is preliminarily loaded into the core portion before the electrode layers are fully assembled. This preliminary action ensures that electrolyte is already positioned to flow into gaps and contact active materials, preventing quality degradation despite non-uniform gaps forming during assembly
3Device complexity
If a wire-type current collector is used for a cable-type secondary battery, then the battery structure is simplified, but resistance becomes high as compared to a sheet-type current collector, resulting in degradation of battery quality
Solution Approach 1:
The current collector is changed from a wire-type (one-dimensional) structure to a sheet-type (two-dimensional) structure. This parameter change in geometry dramatically reduces electrical resistance while maintaining the simplified battery structure, thereby improving battery quality
4Adaptability or versatility
If a linear battery structure is adopted to allow easy deformation, then flexibility is improved, but poor flexibility and high resistance problems occur in conventional implementations
Solution Approach 1:
The electrode layers are nested around the core portion in a concentric arrangement. This nesting configuration allows the battery to be flexible and deformable like a cable, while the core provides structural support and electrolyte reservoir function, preventing the poor flexibility and high resistance issues
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
This configuration improves the flexibility and quality of the battery, reduces resistance, and maintains excellent capacity and cycle characteristics by ensuring proper electrolyte distribution and electrode alignment, enabling efficient lithium ion supply and stress relief.
Implementation Method 1
a sheet-type first inner electrode formed on the outside of the winding core surface between the guide portions by spiral winding; a sheet-type first separation layer formed on the outside of the first inner electrode by spiral winding
Implementation Method 2
a lithium ion supplying core portion with an open structure to facilitate electrolyte infiltration
Implementation Method 3
using sheet-type current collectors to reduce resistance
Implementation Method 4
a cable-type secondary battery which realizes high capacity and allows easy deformation
Data Source
AI summary
Disclosed is a cable-type secondary battery, including: a winding core having guide portions formed by intaglio or relief in a spiral shape on the surface thereof; a sheet-type first inner electrode formed on the outside of the winding core surface between the guide portions by spiral winding; a sheet-type first separation layer formed on the outside of the first inner electrode by spiral winding; a sheet-type second inner electrode formed on the outside of the first separation layer by spiral winding; a second separation layer formed on the outside of the second inner electrode by spiral winding; and an outer electrode formed on the outside of the second separation layer by spiral winding.