Secondary Battery Fuse Portion and Insulating Unit
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Solution Overview
Problem
Secondary batteries are prone to explosions due to overcurrent flow caused by overcharging or abnormal phenomena, which existing technologies fail to effectively prevent.
Innovation Solution
Incorporating a fuse portion with higher resistance into the current collector, which melts and disconnects the electrode plate from the terminal when an overcurrent flows, coupled with an insulating unit to prevent contact with the electrolyte and potential explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse portion is added to the current collector to prevent explosions, then safety is improved, but device complexity increases
Solution Approach 1:
The fuse portion is integrated into the current collector as a unified structure, merging the protective function with the existing current collection component. This eliminates the need for separate fuse components and reduces overall device complexity while maintaining safety functionality.
Solution Approach 2:
The fuse portion automatically responds to overcurrent conditions through its inherent lower melting point, causing it to melt and disconnect the circuit without requiring external control systems or additional safety mechanisms. The system protects itself through the intrinsic properties of the fuse material.
2Reliability
If an insulating unit is added to cover the fuse portion, then safety is improved by preventing contact with electrolyte, but device complexity increases
Solution Approach 1:
The insulating unit acts as an intermediary barrier between the fuse portion and the electrolyte, preventing harmful interactions. This thin insulating layer provides necessary protection without significantly increasing device complexity, as it can be applied as a coating or thin wrap during manufacturing.
3Reliability
If the fuse portion has higher resistance to enable current interruption, then protective function is improved, but energy loss increases
Solution Approach 1:
The fuse portion has localized higher resistance only at the specific section designed to melt, while the rest of the current collector maintains low resistance for efficient current collection. This localized quality change allows the fuse to perform its protective function without significantly increasing overall energy loss during normal operation.
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 solution effectively prevents or substantially prevents explosions by interrupting the overcurrent flow and isolating the fuse from the electrolyte, ensuring the stability and reliability of the secondary battery.
Implementation Method 1
the fuse portion configured to melt and disconnect the first electrode plate from the electrode terminal when a current having a magnitude greater than or equal to a set current flows through the current collector
Implementation Method 2
the fuse portion has a higher resistance than other portions of the current collector
Implementation Method 3
an insulating unit on the fuse portion of the current collector
Data Source
AI summary
A secondary battery including an electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a case containing the electrode assembly; an electrode terminal electrically connected to the first electrode plate; a current collector coupled between and electrically connecting the first electrode plate and the electrode terminal, the current collector including a fuse portion; and an insulating unit on the fuse portion of the current collector.