Cable Battery Taping Layer Bending Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional secondary batteries face limitations in flexibility and durability due to their cylindrical or prismatic shapes, which restrict their use in portable systems requiring high bending characteristics, such as in Bluetooth earphones, where electrode separation can lead to increased contact resistance and physical deterioration upon bending.
Innovation Solution
A cable type secondary battery design featuring a taping layer spirally wound around the electrode assembly to prevent separation, combined with a sheet type packaging that disperses external forces and includes a water barrier film and sealant polymer layers to maintain adhesion and prevent water infiltration, enhancing the battery's bending characteristics and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cable type secondary battery is designed with high bending characteristics (5R bend radius), then flexibility and adaptability are improved, but electrode separation and contact resistance increase occur
Solution Approach 1:
A taping layer is introduced as an intermediary component between the separator layer and outer electrode. This taping layer prevents separation of the electrode assembly during bending while maintaining electrical contact, thus resolving the contradiction between flexibility and contact resistance stability
Solution Approach 2:
The patent employs thin film structures including the separator layer and taping layer that can flex during bending without breaking or separating. These flexible thin films maintain electrode integrity and prevent contact resistance increase while allowing the battery to achieve high bending characteristics
2Adaptability or versatility
If conventional cylindrical or prismatic battery shapes are used, then manufacturing simplicity is maintained, but flexibility and adaptability for portable systems are limited
Solution Approach 1:
The battery is segmented into distinct functional layers (inner electrode, separator layer, outer electrode, taping layer) that can be independently manufactured and then assembled. This segmentation allows each layer to be optimized for its specific function while enabling the overall flexible cable structure
Solution Approach 2:
The patent transitions from conventional 3D cylindrical or prismatic battery shapes to a 1D cable-like structure with high length-to-diameter ratio. This dimensional change enables the battery to be integrated into portable devices where space is constrained and flexibility is required
3Ease of manufacture
If the battery structure is simplified for easy manufacturing, then production efficiency is improved, but bending characteristics and durability are compromised
Solution Approach 1:
Multiple protective functions are merged into the taping layer, which simultaneously prevents electrode separation, maintains structural integrity during bending, and provides mechanical reinforcement. This merging allows enhanced bending durability without significantly complicating the manufacturing process
Data Source
AI summary
The present disclosure relates to a cable type secondary battery which includes: a cable type electrode assembly including an inner electrode, a separator layer formed to surround the outer surface of the inner electrode and preventing a short-circuit between electrodes, and an outer electrode formed to surround the separator layer; a taping layer formed by spirally winding a sheet type tape so that it surrounds the outer surface of the cable type electrode assembly; and a packaging formed to surround the outer surface of the taping layer. According to the present disclosure, it is possible to prevent separation of the separator layer or the outer electrode, and thus to reinforce the bending characteristics of the cable type secondary battery.