Multilayer Electrode Layout for Crack-Resistant Capacitance Retention
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Solution Overview
Problem
Conventional multilayer ceramic capacitors face issues with deformation and piezoelectric cracks in high-pressure environments due to shrinkage and expansion, leading to a decrease in capacitance when methods to enhance withstand voltage and reduce cracks are implemented.
Innovation Solution
A multilayer electronic component design with first and second internal electrode layers alternately disposed with an auxiliary electrode layer interposed, where portions of internal electrodes overlap auxiliary electrodes, distributing voltage efficiently to reduce piezoelectric stress and maintain capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of cover portion, margin portion, and/or dielectric layer is increased, then the withstand voltage is improved and cracks are suppressed, but the area of capacitance formation portion is reduced and capacitance is lowered
Solution Approach 1:
The patent divides the internal electrode structure into multiple segments by introducing auxiliary electrode layers between first and second internal electrode layers. This segmentation allows the capacitance formation portion to be distributed across multiple smaller regions, reducing the area of each individual capacitance formation portion while maintaining the total capacitance. The auxiliary electrode layers act as intermediate segments that enable voltage distribution without requiring increased thickness of cover or margin portions.
Solution Approach 2:
The patent transitions from a conventional planar electrode arrangement to a three-dimensional multilayer structure with auxiliary electrode layers positioned between internal electrode layers. This dimensional change creates additional capacitance formation regions in the vertical direction, allowing voltage to be distributed across multiple layers rather than relying on increased thickness of existing layers, thereby maintaining capacitance while improving withstand voltage.
2Reliability
If the area of capacitance formation portion is reduced to improve withstand voltage, then cracks are suppressed, but capacitance is inevitably lowered
Solution Approach 1:
By segmenting the electrode structure into multiple layers with auxiliary electrodes, the patent creates multiple smaller capacitance formation portions distributed across different layers. This segmentation reduces the area of each individual capacitance formation portion, suppressing cracks, while the cumulative capacitance across all segments maintains the required total capacitance value.
Solution Approach 2:
The auxiliary electrode layers are nested between the first and second internal electrode layers, creating a nested multilayer structure. This nesting arrangement allows capacitance formation portions to be distributed throughout the volume of the component, reducing the area of each portion and suppressing cracks while maintaining total capacitance through the combined effect of multiple nested capacitance layers.
3Reliability
If auxiliary electrode layers are introduced to distribute voltage, then withstand voltage is improved, but the structure becomes more complex and capacitance formation area is reduced
Solution Approach 1:
The auxiliary electrode layers serve multiple functions simultaneously: they distribute voltage across the structure to improve withstand voltage, create additional capacitance formation regions to maintain capacitance, and reduce the area of individual capacitance formation portions to suppress cracks. This multi-functionality justifies the increased structural complexity by delivering multiple benefits from a single design feature.
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 reduces piezoelectric stress and minimizes capacitance loss while improving withstand voltage, preventing cracks and maintaining electrical performance in high-pressure conditions.
Implementation Method 1
at least a portion of the first internal electrode overlaps the second auxiliary electrode in the first direction, and at least a portion of the second internal electrode overlaps the first auxiliary electrode in the first direction
Data Source
AI summary
A multilayer electronic component includes a body having a first internal electrode, a second internal electrode, and a first auxiliary electrode and a second auxiliary electrode spaced apart from each other, in which the first internal electrode and the second internal electrode are alternately arranged with the first and second auxiliary electrode layers interposed therebetween; a first external electrode connected to the first internal electrode and the first auxiliary electrode; and a second external electrode connected to the second internal electrode and the second auxiliary electrode, in which at least a portion of the first internal electrode overlaps the second auxiliary electrode, and at least a portion of the second internal electrode overlaps the first auxiliary electrode.