Floating Electrode Layout in MLCCs for Electrostriction Stress Relief
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Solution Overview
Problem
The electrostriction phenomenon in multilayer ceramic capacitors leads to increased tensile stress, resulting in reliability issues such as electrostriction cracks and burnt defects, particularly in regions where upper and lower electrode patterns do not overlap.
Innovation Solution
A multilayer electronic component design with a floating electrode layer that includes a third electrode pattern having a specific width ratio of space portion to electrode pattern, which offsets electrostriction tensile stress by introducing a space portion in regions of non-overlap, using a structure with a first and second main portion connected by connection portions spaced apart by a space portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floating electrode layer is introduced to distribute voltage, then voltage distribution is improved, but electrostriction tensile stress concentrates in the center region where upper and lower electrode patterns do not overlap
Solution Approach 1:
The floating electrode layer is segmented into multiple electrode patterns arranged in a matrix configuration, with insulating layers positioned between adjacent electrode patterns. This segmentation prevents stress concentration by distributing the electrostriction effects across multiple separated regions rather than allowing uniform stress buildup in the center region.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between adjacent electrode patterns in the floating electrode layer. These insulating layers act as stress relief zones that prevent direct stress transmission between electrode patterns, thereby reducing the concentration of electrostriction tensile stress in the center region while maintaining voltage distribution benefits.
2Use of energy by moving object
If electrode patterns are arranged to maximize capacitance, then energy storage is improved, but regions without electrode overlap experience increased stress leading to cracks and burnt defects
Solution Approach 1:
The electrode patterns are segmented into multiple units arranged in a matrix with insulating layers between them. This segmentation allows the structure to maintain high energy storage capacity through increased electrode surface area while the insulating layers prevent stress concentration that would lead to cracks and burnt defects in regions without overlap.
Solution Approach 2:
Different regions of the floating electrode layer are given different properties: electrode patterns provide capacitance for energy storage, while insulating layers provide stress relief. This local differentiation of function allows the structure to simultaneously achieve high energy storage and resistance to electrostriction-induced damage.
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 electrostriction cracks and burnt defects by distributing stress more evenly, enhancing the reliability and durability of the multilayer ceramic capacitors.
Implementation Method 1
When voltage is applied to a multilayer ceramic capacitor, stress may occur inside the multilayer ceramic capacitor due to an electrostriction phenomenon of a dielectric layer
Data Source
AI summary
In a multilayer electronic component according to an example embodiment of the present disclosure, a floating electrode layer may include a third electrode pattern including a first main portion overlapping at least a portion of the first electrode pattern in the first direction, a second main portion overlapping at least a portion of the second electrode pattern in the first direction, and a pair of connection portions connecting the first main portion and the second main portion and spaced apart from each other in the third direction with a space portion interposed therebetween, and when a maximum width of the third electrode pattern in the third direction is defined as W1, and a maximum width of the space portion in the third direction is defined as W2, W2/W1 may satisfy 0.08 or more and 0.92 or less.