Fuse Body Narrow-Path Layout for Overload and Short-Circuit Protection
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Solution Overview
Problem
Existing fuses used in electric vehicle power distribution systems lack the necessary overload and short-circuit protection capabilities, particularly for higher current ratings and varying operating conditions.
Innovation Solution
A fuse body design featuring differentiated narrow paths with constant and tapering cross-sectional areas, respectively, to enhance heat dissipation and thermal conductivity, allowing for 1.1 In overload tolerance and 2 In, 3 In, and 5 In overload and short-circuit protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fuse body design is used, then the structure is simple and manufacturing is easy, but it cannot provide differentiated overload and short-circuit protection capabilities
Solution Approach 1:
The fuse body is segmented into multiple fusing sections (first and second fusing sections), each containing multiple narrow paths. This segmentation allows different sections to handle different overcurrent scenarios, providing both 1.1In overload tolerance and 2In/3In/5In short-circuit protection capabilities simultaneously.
Solution Approach 2:
Different fusing sections are designed with different local qualities: the first fusing section has narrow paths with constant cross-sectional area for overload tolerance, while the second fusing section has narrow paths with tapering cross-sectional area for short-circuit protection. This local differentiation enables each section to optimize its thermal conductivity and heat dissipation characteristics for specific protection requirements.
2Loss of energy
If the narrow paths have constant cross-sectional area, then the heat dissipation is improved, but the arc initiation time becomes inconsistent under high current conditions
Solution Approach 1:
The patent applies different cross-sectional area profiles to different fusing sections: the first fusing section uses constant cross-sectional area narrow paths optimized for heat dissipation during overload conditions, while the second fusing section uses tapering cross-sectional area narrow paths that ensure consistent arc initiation time during high current short-circuit conditions. This local quality differentiation resolves the contradiction between heat dissipation efficiency and arc initiation consistency.
3Temperature
If the transverse spacing between narrow paths is reduced, then the heat collection capability is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The fuse body is divided into multiple fusing sections with different transverse spacing between narrow paths. The first fusing section has smaller transverse spacing to enhance heat collection for overload tolerance, while the second fusing section has larger transverse spacing that is easier to manufacture with consistent precision. This segmentation allows each section to optimize its spacing for its specific function without compromising overall manufacturability.
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 fuse body effectively meets the enhanced protection requirements by ensuring consistent arc initiation and ignition times under high current conditions, while maintaining a low-cost conductor material and wide range of overcurrent protection capabilities.
Implementation Method 1
the first set of narrow paths to collect heat more easily compared to the second set of narrow paths, resulting in a difference in thermal conductivity and heat dissipation coefficients between the two sets of narrow paths
Implementation Method 2
A fuse is a circuit protection device that disconnects a circuit by fusing the fuse body with its own heat within a certain time frame when the current exceeds a specified value
Data Source
AI summary
This disclosure relates to fuse body for the fuse and the fuse. The fuse body has a longitudinal direction along a length direction and a transverse direction along a width direction, wherein the fuse body comprises: a main body; a first fusing section comprising a first set of through holes arranged in the main body along the transverse direction and a first set of narrow paths formed in the main body along the orientation of the first set of through holes, wherein along the longitudinal direction, the area of the cross-section of each narrow path of the first set of narrow paths is constant; a second fusing section spaced apart from the first fusing section along the longitudinal direction, wherein the second fusing section comprises a second set of through holes disposed in the main body along the transverse direction and a second set of narrow paths formed in the main body along the orientation of the second set of through holes, wherein along the longitudinal direction, the area of the cross-sectional of each narrow path of the second set of narrow paths tapers in a direction toward the center of this narrow path; wherein a transverse spacing between two adjacent narrow paths of the first set of narrow paths is less than a transverse spacing between two adjacent narrow paths of the second set of narrow paths.