Surge-Absorbing Element Structure for Better Heat Dissipation
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Solution Overview
Problem
Existing surge-absorbing elements face challenges in efficiently dissipating heat generated when a surge current flows, which affects their performance and reliability.
Innovation Solution
The surge-absorbing element incorporates a sintered body with a functioning part having a void and an outer shell part with a lower void ratio, along with internal and external electrodes. The external electrodes have a first portion covering the end surfaces and second portions covering the side surfaces, with the second portions having a smaller thickness than the first portion, facilitating efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the external electrodes have uniform thickness covering all surfaces, then the structural simplicity is maintained, but the heat dissipation efficiency is insufficient
Solution Approach 1:
The external electrodes are designed with non-uniform thickness: a first thickness for portions covering the first and second end surfaces, and a second thickness (smaller than the first) for portions covering the side surfaces. This local differentiation optimizes heat dissipation efficiency while maintaining structural feasibility, directly resolving the contradiction between heat dissipation performance and structural complexity.
2Reliability
If the sintered body has high void ratio, then the surge absorption capability is improved, but the heat dissipation performance deteriorates
Solution Approach 1:
The sintered body is segmented into two functional regions: a functioning part with high void ratio for surge absorption, and an outer shell part with lower void ratio for heat dissipation. This segmentation allows each region to optimize its specific function, resolving the contradiction between surge absorption capability and heat dissipation performance.
Solution Approach 2:
Different void ratios are assigned to different regions of the sintered body: the functioning part has a high void ratio to enhance surge absorption, while the outer shell part has a lower void ratio to improve heat dissipation. This local quality differentiation enables simultaneous optimization of both surge absorption and heat dissipation functions.
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 configuration enables effective heat dissipation into the substrate, improving the surge-absorbing element's ability to manage heat generated during surge current flow, thereby enhancing its performance and reliability.
Implementation Method 1
heat generated when a surge current flows
Implementation Method 2
heat dissipation into the substrate
Data Source
AI summary
A surge-absorbing element includes a sintered body, a pair of internal electrodes, and a pair of external electrodes. The sintered body has a pair of end surfaces facing away from each other and a plurality of side surfaces each adjacent to the pair of end surfaces. The sintered body includes a functioning part having a void and an outer shell part covering the functioning part and having a lower void ratio than the functioning part. The pair of internal electrodes face each other while the functioning part is disposed between the pair of internal electrodes. Each of the pair of external electrodes includes a first portion covering a corresponding one of the pair of end surfaces and second portions each covering a corresponding one of the plurality of side surfaces. A thickness of each of the second portions is greater than a thickness of the first portion.