MLCC Support Member Structure for Piezoelectric Crack Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) used in high-voltage environments face deformation and cracking due to piezoelectric phenomena, compromising their reliability.
Innovation Solution
A multilayer electronic component design featuring a dielectric layer, internal electrodes, external electrodes, and support members with varying thicknesses to suppress expansion and disperse stress, enhancing reliability in high-voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage is applied to MLCCs, then the piezoelectric phenomenon causes expansion of the MLCC body, but cracks may occur in the MLCC body due to this deformation
Solution Approach 1:
The support member is divided into a first end with greater thickness and a second end with lesser thickness, creating a segmented structural configuration that distributes mechanical stress differently across the support member, thereby reducing stress concentration that could lead to cracks in the MLCC body
Solution Approach 2:
The support member has non-uniform thickness with the first end being thicker than the second end, creating local variations in mechanical properties. The thicker first end provides enhanced support where needed, while the thinner second end reduces overall stress on the MLCC body, addressing the local stress distribution problem
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 suppresses piezoelectric expansion and stress, improving the reliability and durability of MLCCs in high-voltage environments by using support members with thinner ends to disperse stress.
Implementation Method 1
When high voltage is applied to MLCCs, the piezoelectric phenomenon in the dielectric material may cause deformation such as expansion of the MLCC body
Data Source
AI summary
A multilayer electronic component includes a body having a dielectric layer and an internal electrode alternately stacked in a first direction. An external electrode is disposed on the body and connected to the internal electrode. A support member is disposed on at least one of the two opposing surfaces of the body in the first direction. The support member has a first end in contact with the external electrode and a second end opposite the first end, wherein the second end has a smaller thickness than the first end in the first direction.