Cable Battery Open Current Collector Shape Adaptation
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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 risks to performance.
Innovation Solution
A cable-type secondary battery design featuring an open-structured outer current collector, which can be in the form of a wound wire, wound sheet, or mesh, surrounded by an outer electrode active material layer, along with an inner electrode and separation layer, enhancing flexibility and preventing short circuits through elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional solid outer current collector is used, then structural strength is maintained, but flexibility and shape adaptability are limited
Solution Approach 1:
The patent replaces the conventional solid outer current collector with a flexible membrane structure that can bend and deform without breaking. This membrane acts as both the outer current collector and protective casing, enabling the battery to adapt to various shapes while maintaining structural integrity through its flexible nature.
Solution Approach 2:
The outer current collector is designed with a porous or mesh-like structure instead of being solid. This porous configuration provides both flexibility for shape adaptation and sufficient mechanical strength through the interconnected network structure, resolving the contradiction between flexibility and strength.
2Adaptability or versatility
If the outer current collector is made flexible to change shape, then shape adaptability improves, but short circuit risk increases due to deformation
Solution Approach 1:
The patent introduces a separation layer as an intermediary between the inner and outer electrodes. This separation layer maintains a consistent distance between the electrodes even when the flexible outer current collector deforms, preventing direct contact and short circuits while allowing the battery to change shape freely.
Solution Approach 2:
The flexible membrane structure of the outer current collector is designed to deform in a controlled manner before any potential short circuit could occur. This prior cushioning through elastic deformation absorbs external forces and prevents the electrodes from coming into contact, maintaining reliability during shape changes.
3Reliability
If a rigid structure is used to prevent short circuit, then reliability improves, but flexibility and ease of operation deteriorate
Solution Approach 1:
The patent employs a flexible membrane as the outer current collector that can bend and deform to provide ease of operation and shape adaptability. The membrane's flexibility allows the battery to be easily manipulated and configured in different shapes while maintaining its function.
Solution Approach 2:
The separation layer serves as a mediator that ensures reliable short circuit prevention even when the flexible structure is used. It maintains electrode separation through its physical presence and spacing function, decoupling the reliability function from the need for rigid structure.
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 and an open-structured outer current collector.