MLCC External Electrode Resin Structure for Flexural Strength
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Solution Overview
Problem
Existing multilayer ceramic capacitors (MLCCs) face challenges in achieving high reliability and strength characteristics, particularly in automotive applications, where they are required to withstand mechanical stress and maintain electrical performance.
Innovation Solution
A multilayer electronic component design featuring external electrodes with a dual-layer structure comprising an electrode layer and a conductive resin layer, where the resin layer includes a combination of conductive metal, epoxy resin, and acrylic resin to enhance flexural strength and reduce equivalent series resistance (ESR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-layer structure including an electrode layer and a conductive resin layer is used, then reliability is improved by preventing penetration of plating solution, but device complexity increases
Solution Approach 1:
The external electrode is divided into two distinct layers: an electrode layer and a conductive resin layer. This segmentation allows each layer to perform its specific function - the electrode layer provides electrical conductivity while the conductive resin layer prevents plating solution penetration, thereby improving reliability without requiring complex multi-component assemblies
Solution Approach 2:
The conductive resin layer is formed as a composite material combining conductive particles with resin matrix. This composite structure provides both electrical conductivity and protective properties, preventing plating solution penetration while maintaining the electrical functionality needed for reliable operation
2Strength
If the conductive resin layer is made thicker to improve flexural strength, then strength is improved, but equivalent series resistance increases
Solution Approach 1:
The thickness of the conductive resin layer is precisely controlled within the range of 1 μm to 10 μm. This parameter optimization ensures that the layer is thick enough to provide adequate flexural strength and protection, yet thin enough to maintain low equivalent series resistance, resolving the trade-off between mechanical strength and electrical performance
Solution Approach 2:
The conductive resin layer is applied selectively on specific regions of the electrode layer, particularly on the outer surfaces where mechanical strength is most needed. This localized application provides enhanced flexural strength where required while minimizing the overall conductive material usage, thereby keeping ESR low
Data Source
AI summary
A multilayer electronic component includes a body including first and second surfaces opposing each other in a first direction, third and fourth surfaces connected to the first and second surfaces and opposing each other in a second direction, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other in a third direction and including a dielectric layer and internal electrodes alternately disposed with the dielectric layer interposed therebetween in the first direction, and external electrodes disposed on the third and fourth surfaces, wherein the external electrodes include an electrode layer disposed on the body and a conductive resin layer disposed on the electrode layer, and the conductive resin layer includes a conductive metal, an epoxy resin, and an acrylic resin.