Fuse Cutout Structure for Arc-Suppressing Battery Protection
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Solution Overview
Problem
Existing protective elements in battery packs with high-voltage/large-current paths are prone to arc discharge due to the cutting of fuse elements, and such discharges can continue, while the cut portion of the fuse element may also be triggered by temperature variations, leading to reliability issues.
Innovation Solution
A protective element design featuring a fuse element with a cut portion having a penetration hole and/or thin portion, a movable member with a projection, and a recessed member, where the cut portion is sandwiched between them, and a pressing means applies force to cut the fuse element at its softening temperature, with specific dimensions and materials to minimize arc discharge and temperature-induced cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the cut portion is made thinner to facilitate cutting, then arc discharge can be reduced, but the structural strength of the fuse element decreases
Solution Approach 1:
The fuse element employs local quality variation with a thinner cut portion (first thickness) that generates less arc discharge when cut, while thicker portions (second thickness) away from the cut maintain structural strength and mechanical integrity. This differential thickness design optimizes both arc suppression and structural robustness.
2Reliability
If a pressing means is added to apply force to cut the fuse element, then the cutting reliability at softening temperature improves, but the device complexity increases
Solution Approach 1:
The fuse element design enables self-service cutting through its differential thickness structure. During overcurrent, heat naturally concentrates at the thinner cut portion, causing it to soften and cut automatically without requiring external pressing means. This eliminates complex mechanical structures while maintaining reliable cutting functionality.
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 design effectively reduces and curbs arc discharge occurrence and continuation, while minimizing cuts due to temperature variations, ensuring reliable operation in high-voltage/large-current environments.
Implementation Method 1
the cut portion is cut due to a force of the pressing means when the temperature of the cut portion of the fuse element reaches or exceeds a softening temperature
Implementation Method 2
a pressing means applying a force so as to shorten a relative distance in a direction in which the cut portion is sandwiched between the movable member and the recessed member. The cut portion is cut due to the force of the pressing means
Data Source
AI summary
A protective element includes a fuse element having a cut portion between a first end portion and a second end portion and electrified in a first direction from the first end portion toward the second end portion; a movable member, having a projection portion, and a recessed member having a recessed portion allowing the projection portion to be inserted therein, which are disposed facing each other such that the cut portion is sandwiched therebetween; and a pressing means applying a force so as to shorten a relative distance in a direction in which the cut portion is sandwiched between the movable member and the recessed member. The cut portion is cut due to the force of the pressing means at a temperature equal to or higher than a softening temperature of the fuse element. The cut portion of the fuse element has one of or both a penetration hole and a thin portion in at least part thereof.