Multilayer Ceramic Capacitor Electrode Extensions Against Delamination
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Solution Overview
Problem
As the number of electrode layers increases in multilayer ceramic capacitors to enhance capacitance, the internal stress difference between layers leads to increased delamination, particularly in the extension regions of internal electrodes.
Innovation Solution
Incorporating through holes and pillar portions made of the same dielectric material as the dielectric layers within the extension portions of internal electrodes, which connect adjacent dielectric layers, reducing the extension distance and providing structural support to prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of electrode layers is increased to enhance capacitance, then the capacitance is improved, but the internal stress difference between layers increases leading to delamination
Solution Approach 1:
The internal electrode is segmented into multiple portions: a counter portion, a first extension portion, a second extension portion, and an intermediate portion. This segmentation allows each portion to serve specific functions in managing stress distribution and preventing delamination while maintaining high capacitance through increased layer count.
Solution Approach 2:
Different portions of the internal electrode are designed with distinct characteristics: the counter portion has specific dimensions for electrical connection, the extension portions have controlled lengths for stress management, and the intermediate portion has reduced dimensions. This local differentiation optimizes both capacitance and delamination resistance in different regions of the capacitor.
2Volume of stationary object
If the thickness of dielectric layers is reduced to decrease capacitor size, then the volume is reduced, but the internal stress between layers increases
Solution Approach 1:
The intermediate portion of the internal electrode is designed with reduced dimensions compared to other portions, creating a dynamic stress distribution pattern. This allows the structure to adapt to thermal and mechanical stresses that occur during operation, preventing delamination even when dielectric layers are thin.
Solution Approach 2:
The dimensions of the intermediate portion are specifically controlled to be smaller than those of the counter and extension portions. This parameter change creates a stress-relief zone that accommodates internal stresses in thin-layer structures, maintaining reliability while enabling compact capacitor design.
3Reliability
If the extension distance of internal electrodes is reduced to prevent delamination, then the delamination resistance is improved, but the capacitance decreases
Solution Approach 1:
The internal electrode structure is extended into multiple dimensions with different portions having different characteristics. The counter portion, extension portions, and intermediate portion are arranged in specific spatial configurations that allow sufficient extension distance for capacitance while incorporating stress-relief features to prevent delamination.
Data Source
AI summary
A multilayer ceramic capacitor includes a laminate including dielectric layers and internal electrodes. The internal electrodes include opposing portions, and extension portions extending to a lateral surface and/or an end surface of laminate. The extension portions include through-holes, and column portions in the through-holes. The column portions are made of a same material as the dielectric layers, and connect adjacent dielectric layers to each other in a lamination direction so as to sandwich the extension portions therebetween. When the direction in which the extension portions extend is defined as an extension direction, and a distance of extension of the extension portions toward the lateral surface or the end surface is defined as the extension distance, the dimension of the column portions, in the extension direction is from about 20% to about 80%.