Secondary Battery Fuse Unit With Notch Control
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Solution Overview
Problem
Secondary batteries face safety risks due to excessive current charging or discharging, which can lead to heat generation, electrolyte decomposition, increased internal pressure, and potential explosion or ignition, necessitating a reliable overcurrent blocking mechanism.
Innovation Solution
A secondary battery design incorporating a fuse unit with a fracture unit surrounding a through hole and a blocking point control unit, which blocks current beyond a preset point by melting due to resistance heat, ensuring precise control of the blocking point while minimizing structural strength reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse unit is added to block excessive current, then safety is improved, but structural strength is reduced
Solution Approach 1:
The current collecting member is segmented into a fracture unit and a remaining part, with the fracture unit forming a fuse unit that surrounds a through hole. This segmentation allows the fuse unit to be a separate, sacrificial component that can break without compromising the overall structural integrity of the current collecting member.
Solution Approach 2:
A blocking point control unit is introduced as an intermediary element formed on the fracture unit. This control unit precisely defines the blocking point by controlling the cross-sectional area, acting as a mediator between the fuse unit and the through hole to ensure reliable current blocking at the designed point while maintaining structural strength.
2Reliability
If the through hole is enlarged to form the fuse unit, then overcurrent blocking capability is improved, but current collecting ability is reduced
Solution Approach 1:
The fuse unit is formed with a specific local quality by creating a fracture unit with a controlled cross-sectional area around the through hole. The blocking point control unit further refines this local quality by precisely defining the cross-sectional area at the blocking point, ensuring that the fuse unit has the exact properties needed for overcurrent blocking without unnecessarily reducing the current collecting ability of the remaining current collecting member.
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 safety accidents like explosions or fires by reliably blocking excessive current paths and precisely controlling the blocking point, thereby enhancing safety and maintaining structural integrity.
Implementation Method 1
a blocking point control unit formed in a notch shape on the fracture unit... blocks current beyond a preset blocking point by melting due to resistance heat
Data Source
AI summary
A secondary battery includes an electrode assembly; a cap plate and a case accommodating the electrode assembly; an electrode terminal protruding above the cap plate; a current collecting member that electrically connects the electrode assembly to the electrode terminal; and a fuse unit on the current collecting member and configured to block a current beyond a preset blocking point, wherein the fuse unit includes a fracture unit surrounding a through hole in the current collecting member; and a blocking point control unit formed as a notch on the fracture unit.