MLCC External Electrode Grading for Bending Strength and Plating
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) for automotive electronics face challenges in achieving both excellent bending strength and electrical properties, as reducing metal particle content in conductive resin layers improves bending strength but compromises plating properties and Equivalent Series Resistance (ESR), while increasing metal particle content enhances plating properties and ESR but reduces bending strength.
Innovation Solution
A multilayer electronic component with a conductive resin layer that includes metal particles, core-shell particles with a polymer core and metal shell, and a resin. The conductive resin layer is divided into two regions: a first region adjacent to the body and a second region adjacent to the outside. In at least one cross-section, the area fraction occupied by core-shell particles in the second region is greater than in the first region, improving bending strength and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of metal particles in the conductive resin layer is reduced, then bending strength is improved, but plating properties and ESR characteristics deteriorate
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of core-shell particles within the conductive resin layer. Specifically, the concentration of core-shell particles varies across different regions of the layer, with higher concentrations positioned to optimize both mechanical strength and electrical properties. This localized variation allows different areas of the conductive resin layer to fulfill different functional requirements simultaneously.
Solution Approach 2:
The patent employs composite materials by combining metal particles with core-shell particles (consisting of a polymer core and metal shell) within the conductive resin layer. This composite structure leverages the advantages of both material types: the metal particles provide electrical conductivity and plating properties, while the core-shell particles contribute to bending strength through their polymer core that can absorb mechanical stress. The synergistic combination resolves the contradiction between strength and electrical properties.
2Reliability
If the content of metal particles in the conductive resin layer is increased, then plating properties and ESR characteristics are improved, but bending strength is reduced
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of core-shell particles within the conductive resin layer. Specifically, the concentration of core-shell particles varies across different regions of the layer, with higher concentrations positioned to optimize both mechanical strength and electrical properties. This localized variation allows different areas of the conductive resin layer to fulfill different functional requirements simultaneously.
Solution Approach 2:
The patent employs composite materials by combining metal particles with core-shell particles (consisting of a polymer core and metal shell) within the conductive resin layer. This composite structure leverages the advantages of both material types: the metal particles provide electrical conductivity and plating properties, while the core-shell particles contribute to bending strength through their polymer core that can absorb mechanical stress. The synergistic combination resolves the contradiction between strength and electrical properties.
Data Source
AI summary
A multilayer electronic component includes a body containing a dielectric layer and an internal electrode alternately disposed with the dielectric layer, and an external electrode disposed on the body and connected to the internal electrode. The external electrode includes a conductive resin layer including metal particles, core-shell particles including a polymer core and a metal shell disposed on at least a portion of the polymer core, and a resin. The conductive resin layer includes a first region adjacent to the body and a second region adjacent to an outside of the conductive resin layer. In at least one cross section passing through the body, an area fraction occupied by the core-shell particles in the second region is greater than an area fraction occupied by the core-shell particles in the first region.