Cable-Type Battery Spaced Spring Support and Porous Electrodes
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Solution Overview
Problem
Conventional cable-type secondary batteries face challenges with flexibility, deformation, and quality due to poor electrode alignment, high resistance, and uneven electrolyte distribution, which affect their capacity and cycle characteristics.
Innovation Solution
A cable-type secondary battery design featuring a winding core with a spaced spring inner electrode support, sheet-type electrodes, and a lithium ion supplying core portion with an open structure to facilitate electrolyte infiltration and ion supply, using sheet-type current collectors to reduce resistance and maintain alignment, and a polymer film layer for enhanced flexibility and stress relief.
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 an electrode, resulting in increased resistance and degraded capacity characteristics
Solution Approach 1:
The patent employs a porous three-dimensional current collector with high porosity (50-90%) that allows electrolyte to penetrate deeply into the electrode structure. The porous structure enables efficient electrolyte distribution to active material particles while maintaining electrical conductivity, thus improving capacity characteristics without requiring complex electrolyte injection systems.
Solution Approach 2:
The patent implements a nested structure where the porous current collector is wound around a central core, with electrodes and separators layered concentrically. This nested arrangement allows electrolyte to flow through the central core and distribute uniformly to all electrode layers, ensuring reliable capacity characteristics while maintaining a simplified overall battery structure.
2Shape
If a wire-type current collector is used for a cable-type secondary battery, then the linear structure is achieved, but resistance becomes high as compared to a sheet-type current collector, resulting in degradation of battery quality
Solution Approach 1:
The patent uses a composite current collector structure combining a conductive core (wire or sheet) with a porous three-dimensional outer layer. This composite design maintains the linear cable shape while providing large surface area and low resistance through the porous conductive material, thereby improving battery quality without sacrificing the desired linear form factor.
Solution Approach 2:
The patent transitions from a one-dimensional wire-type current collector to a three-dimensional porous structure with high surface area. This dimensional expansion provides multiple conduction pathways and reduces electrical resistance while maintaining the overall linear cable configuration, thus improving battery quality.
3Shape
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 patent employs a flexible, compressible porous current collector that can dynamically adjust to accommodate non-uniform gaps between electrodes and separators. The porous structure compresses in regions with larger gaps, maintaining consistent electrolyte pathways and ensuring smooth electrolyte introduction to all active material layers, thereby preserving battery quality.
Solution Approach 2:
The patent applies local quality by allowing the porous current collector to have varying density and porosity in different regions. Areas with larger gaps have higher porosity and compressibility to maintain electrolyte flow, while areas with tighter spacing have lower porosity. This localized adaptation ensures uniform electrolyte distribution throughout the electrode assembly.
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 design achieves high-capacity, flexible, and deformable batteries with improved resistance and quality characteristics by ensuring proper electrolyte distribution and electrode alignment, minimizing damage and short-circuit risks during bending.
Implementation Method 1
an inner electrode support wound on the outside of the winding core in the form of a spaced spring
Implementation Method 2
a lithium ion supplying core portion with an open structure to facilitate electrolyte infiltration and ion supply
Implementation Method 3
open structure to facilitate electrolyte infiltration
Data Source
AI summary
Disclosed is a cable-type secondary battery, including: a winding core; an inner electrode support wound on the outside of the winding core in the form of a spaced spring so that the winding core may be exposed partially; a sheet-type first inner electrode formed on the outside of the exposed winding core 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.