Rechargeable Battery Fuse With Sliding Insulation
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Solution Overview
Problem
Rechargeable batteries face challenges in effectively managing overcurrents, leading to arc generation and poor short-circuit characteristics due to the difficulty in isolating separated fuse parts efficiently.
Innovation Solution
The rechargeable battery incorporates a fuse portion with a sliding insulation portion that, upon melting, creates a gas pressure to separate the fuse parts, preventing arc generation and enhancing the short-circuit characteristic by sliding engagement with a current collecting portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse portion is used to protect against overcurrent, then safety is improved, but arc generation occurs when fuse parts separate due to poor isolation
Solution Approach 1:
The harmful arc generation is extracted and isolated from the main circuit by introducing a dedicated insulation portion that physically separates the fuse parts when they separate during overcurrent protection, preventing arc formation while maintaining the fuse's protective function
Solution Approach 2:
The insulation portion acts as an intermediary element between the fuse parts, providing a non-conductive barrier that prevents direct contact and arc generation between separated fuse parts while allowing the fuse to perform its protective function
2Reliability
If insulation structure is added to prevent arc generation, then safety is improved, but device complexity increases
Solution Approach 1:
The insulation portion is merged with the current collecting lead portion structure, where the insulation portion integrates sliding engagement features with the lead member, reducing the need for separate isolation components and simplifying the overall device structure
Solution Approach 2:
The insulation portion performs multiple functions simultaneously: providing electrical isolation, enabling sliding engagement for separation, and maintaining structural integrity, thereby reducing the need for additional dedicated components and simplifying the overall design
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
This design effectively extinguishes arcs and improves the short-circuit characteristic by ensuring the separation of fuse parts, thereby enhancing the battery's stability and safety against overcurrents.
Implementation Method 1
a gas pressure created by melting of the fuse portion when a current exceeding a predetermined level flows in the fuse portion
Implementation Method 2
the insulation portion being slidable in response to pressure applied in the fuse portion
Data Source
AI summary
A rechargeable battery includes an electrode assembly for charging and discharging, a case in which the electrode assembly is stored; an electrode terminal electrically connected to the electrode assembly; a current collecting portion that electrically connects the electrode assembly with the electrode terminal, the current collecting portion including a fuse portion; and an insulation portion that insulates the fuse portion, the insulation portion being slidable in response to pressure applied in the fuse portion.