Cable-Type Battery Open-Structured Outer Current Collector
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Solution Overview
Problem
Existing secondary batteries face limitations in shape flexibility and are prone to short circuits due to deformation of their outer current collectors, restricting their adaptability in various applications and posing safety concerns.
Innovation Solution
A cable-type secondary battery design featuring an inner electrode with an inner current collector and active material layer, a separation layer to prevent short circuits, and an outer electrode with an open-structured current collector and conductive paste layer, which enhances flexibility and reduces the risk of deformation-induced short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional outer current collector structure is used, then structural strength is maintained, but flexibility and shape adaptability deteriorate
Solution Approach 1:
The outer current collector is designed as a thin-walled hollow cylindrical structure that provides flexibility and shape adaptability while maintaining sufficient structural strength through its hollow configuration
Solution Approach 2:
The hollow cylindrical outer current collector encloses the inner electrode assembly, creating a nested structure where the outer shell protects and contains the internal components while allowing shape flexibility
2Adaptability or versatility
If the outer current collector is made flexible, then shape adaptability improves, but short circuit risk increases due to deformation
Solution Approach 1:
An insulating coating layer is applied to the outer surface of the outer current collector to prevent direct contact between the outer and inner current collectors during deformation, thereby eliminating the short circuit risk while maintaining flexibility
Solution Approach 2:
The insulating coating is applied in advance to the outer current collector to provide protective cushioning against potential short circuits that may occur during subsequent deformation or bending operations
3Adaptability or versatility
If a solid outer current collector is used, then structural stability is maintained, but flexibility and weight reduction deteriorate
Solution Approach 1:
The outer current collector transitions from a solid structure to a thin-walled hollow cylindrical shell that achieves both flexibility and structural stability through its hollow configuration
Solution Approach 2:
The outer current collector combines the hollow structural form with an insulating coating material to create a composite structure that simultaneously provides flexibility, stability, and electrical insulation
Data Source
AI summary
The present invention relates to a cable-type secondary battery having a horizontal cross section of a predetermined shape and extending longitudinally, comprising: an inner electrode having an inner current collector and an inner electrode active material layer surrounding the outer surface of the inner current collector; 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 having an outer electrode active material layer, an open-structured outer current collector and a conductive paste layer.The outer electrode having a conductive paste layer and an open-structured outer current collector according to the present invention has good flexibility to improve the flexibility of a cable-type secondary battery having the same. Also, the conductive paste layer is made of a light material, and thus can contribute to the lightening of the cable-type secondary battery.