Cable-Type Secondary Battery With 3D Network Current Collector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary batteries face limitations in shape flexibility and electrolyte infiltration, leading to poor performance and cycle characteristics due to their rigid structures and polymer electrolytes.
Innovation Solution
A cable-type secondary battery with a core for supplying lithium ions, featuring an inner electrode with a three-dimensional network current collector and a separation layer to prevent short circuits, allowing for easy electrolyte penetration and improved ion exchange, along with an outer electrode and current collector configuration for enhanced surface area and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If secondary batteries use cylindrical, prismatic, or pouch shapes with metal casings, then the batteries have structural strength and stability, but the shape flexibility is limited and cannot adapt to various mobile device configurations
Solution Approach 1:
The patent adopts a flexible cable-type structure with thin-film electrodes and a porous three-dimensional network current collector. This design eliminates the need for rigid metal casings while maintaining sufficient structural strength through the engineered porous network, enabling the battery to be bent and shaped to fit various mobile device configurations
Solution Approach 2:
The patent transitions from traditional two-dimensional planar electrode structures to a three-dimensional cable-type configuration with a porous network architecture. This dimensional transformation provides both mechanical flexibility for shape adaptation and sufficient structural strength through the three-dimensional framework
2Adaptability or versatility
If the battery uses a linear structure with high length to cross-sectional diameter ratio, then the battery can change shape freely, but the electrolyte infiltration into electrode active material becomes insufficient, increasing resistance
Solution Approach 1:
The patent utilizes a porous three-dimensional network current collector that provides extensive internal surface area and numerous infiltration pathways. This porous structure ensures adequate electrolyte penetration even in linear cable-type configurations with high length to diameter ratios, maintaining low resistance while preserving shape flexibility
Solution Approach 2:
The patent employs a three-dimensional porous network architecture that adds vertical dimensionality to the current collector structure. This three-dimensional configuration increases the surface area and creates multiple pathways for electrolyte infiltration, overcoming the limitations of linear structures while maintaining 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 battery exhibits superior capacity, cycle, and rate characteristics while maintaining flexibility, as the three-dimensional network structure facilitates lithium ion supply and exchange without the need for excessive electrolyte thickness, improving overall performance and stability.
Implementation Method 1
a core for supplying lithium ions, which comprises an electrolyte
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention provides a cable-type secondary battery having a horizontal cross section of a predetermined shape and extending longitudinally, comprising: a core for supplying lithium ions, which comprises an electrolyte; an inner electrode surrounding the outer surface of the core for supplying lithium ions, and comprising an inner current collector in the form of a pipe having a three-dimensional network structure, the inner current collector being coated with an inner electrode active material on the outer surface thereof; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and an outer electrode surrounding the outer surface of the separation layer and comprising an outer electrode active material layer and an outer current collector. In accordance with the present invention, the core for supplying lithium ions, which comprises an electrolyte, is disposed in the inner electrode having an open structure, which comprises an inner current collector in the form of a pipe having a three-dimensional network structure, so the electrolyte of the core for supplying lithium ions can be easily penetrated into an electrode active material, thereby facilitating the supply and exchange of lithium ions. Accordingly, the cable-type secondary battery of the present invention has such a core for supplying lithium ions to exhibit superior capacity and cycle characteristics.