MLCC External Electrode Resin Structure Against Band-End Peeling
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face issues with reduced bending strength due to peeling-off phenomena at the ends of external electrode band portions, which are exacerbated by lower adhesive strength between the external electrodes and the body, leading to potential cracks and reduced reliability.
Innovation Solution
The MLCC design includes resin layers in contact with the external electrodes, ensuring that the size of the resin layer exceeds that of the conductive resin layer in the band portions, enhancing adhesive strength and preventing peeling-off, thereby improving bending strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive resin layer includes a large amount of metal particles to secure electrical characteristic, then the electrical characteristic is improved, but the adhesive strength between the external electrode and the body portion is reduced
Solution Approach 1:
The external electrode is divided into two distinct layers: a conductive resin layer containing metal particles for electrical conduction, and a resin layer without metal particles for adhesion. This segmentation allows each layer to specialize in its primary function without compromising the other.
Solution Approach 2:
Different regions of the external electrode have different compositions tailored to their specific functions. The conductive resin layer has high metal particle content for electrical conductivity, while the resin layer has no metal particles for maximum adhesive strength. This local differentiation resolves the contradiction between electrical characteristic and adhesive strength.
2Strength
If the band portion length is increased to disperse stress and improve bending strength, then the bending strength is improved, but the peeling-off phenomenon occurs at the end of the band portion due to lower adhesive strength
Solution Approach 1:
The external electrode is segmented into a conductive resin layer and a resin layer, with the resin layer specifically positioned at the band portion ends to prevent peeling-off while the conductive resin layer maintains electrical conductivity throughout.
Solution Approach 2:
The resin layer is strategically placed at the band portion ends where peeling-off occurs, providing localized adhesive reinforcement exactly where needed. This local quality enhancement prevents peeling-off without requiring a reduction in band portion length, thereby maintaining bending strength.
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 improved adhesive strength and resin layer configuration effectively disperse bending stress, enhancing the MLCC's reliability and preventing cracks, even at reduced thicknesses for smaller sizes and higher capacitance.
Implementation Method 1
a peeling-off phenomenon may occur, in which an end of the band portion is separated when a lower adhesive strength acts between the external electrodes and a body portion
Implementation Method 2
the conductive resin layer applied to the external electrode may include a large amount of metal particles dispersed in resin to secure an electrical characteristic of the MLCC
Implementation Method 3
more stress acting on the external electrode may be dispersed as the band portion has a longer length
Data Source
AI summary
A multilayer electronic component includes: a body having a dielectric layer and first and second internal electrodes alternately disposed with each other while having the dielectric layer interposed therebetween in a first direction; and an external electrode including a connection portion and a band portion extending from the connection portion onto first and second surfaces of the body, wherein the external electrode further includes an electrode layer connected to one of the first and second internal electrodes, a resin layer in contact with the first and second surfaces, and a conductive resin layer disposed on the electrode layer and extending to the resin layer, and L1′≥L1 when L1 indicates a second-directional size of the resin layer in the band portion, and L1′ indicates a second-directional size of the conductive resin layer in the band portion.