Multilayer Ceramic Capacitor Layout to Prevent Interface Delamination
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Solution Overview
Problem
Series-structured multilayer ceramic capacitors face delamination issues at the interface between internal electrode layers and dielectric layers due to differences in shrinkage, which is exacerbated by increasing the number of stacked layers to maintain capacitance.
Innovation Solution
The solution involves positioning electrodes at specific locations within the multilayer body, including floating island electrodes between the end and lateral surfaces, to reduce intrinsic stress and prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of stacked internal electrode layers and dielectric layers is increased to maintain capacitance, then voltage resistance is improved, but intrinsic stress increases causing delamination at the interface between internal electrode layers and dielectric layers
Solution Approach 1:
The internal electrode layers are segmented into first internal electrode layers, second internal electrode layers, and intermediate electrode layers. This segmentation allows for the introduction of floating island electrodes that can independently manage stress in different regions, preventing delamination while maintaining the series-connected capacitance structure for high voltage resistance.
Solution Approach 2:
Floating island electrodes are introduced as intermediary elements between the internal electrode layers and dielectric layers. These floating island electrodes act as stress buffers that absorb differential shrinkage stress, preventing direct stress transmission that would cause delamination at the interfaces.
2Reliability
If the number of stacked internal electrode layers and dielectric layers is increased to maintain capacitance, then voltage resistance is improved, but device complexity increases
Solution Approach 1:
The floating island electrodes serve multiple functions: they act as stress buffers to prevent delamination, maintain the series-connected capacitance structure for high voltage resistance, and provide a unified design approach that can be applied across different capacitor configurations. This multi-functionality reduces the need for additional specialized components.
Solution Approach 2:
The invention changes the structural parameters by introducing floating island electrodes with specific positioning and connectivity characteristics. This parameter change allows the system to achieve the desired stress management and electrical performance without proportionally increasing the total number of stacked layers, thus controlling device complexity.
Data Source
AI summary
A multilayer ceramic capacitor includes first and second internal electrode layers, and an intermediate electrode layer, a first floating island electrode in a region between an end surface and the intermediate electrode layer of the multilayer body, and a second floating island electrode in a region between a lateral surface and an internal electrode layer of the multilayer body, in a dielectric region including a dielectric layer interposed between the first internal electrode layers or the second internal electrode layers in the lamination direction.