MLCC External Electrode Resin Structure for Higher Capacitance
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Solution Overview
Problem
The issue with existing multilayer ceramic capacitors is that thick external electrodes occupy a large volume, leading to a reduction in effective capacitance.
Innovation Solution
The design incorporates a first and second external electrode with a non-conductive resin layer and a conductive resin layer, where the non-conductive resin layer is longer than the conductive resin layer, and both are partially covering the external electrode, reducing the overall volume and enhancing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external electrode is made thick to ensure sufficient electrical connection and durability, then the reliability of electrical connection is improved, but the volume occupied by the external electrode increases, reducing the effective capacitance
Solution Approach 1:
The external electrode is segmented into multiple functional layers: a base electrode layer for electrical connection, a non-conductive resin layer for insulation and mechanical protection, and a conductive resin layer for enhanced electrical connection. This segmentation allows each layer to be optimized independently, reducing the overall volume while maintaining reliability.
Solution Approach 2:
The external electrode uses composite material structure combining metal (electrode layer), non-conductive resin, and conductive resin. This composite approach provides both the electrical conductivity needed for reliable connection and the insulation required, while the resin components reduce overall electrode volume compared to solid metal construction.
2Volume of stationary object
If the external electrode volume is reduced to increase effective capacitance, then the ceramic main body size increases improving capacitance, but the electrical connection area and durability may be compromised
Solution Approach 1:
By dividing the external electrode into functional segments (electrode layer, non-conductive resin layer, conductive resin layer), the design reduces total volume while each segment maintains its specific function for reliable electrical connection and durability.
Solution Approach 2:
The composite structure of metal electrode layer combined with conductive and non-conductive resin layers provides both reduced volume and maintained electrical connection durability, as each material contributes its superior properties in a compact integrated structure.
Data Source
AI summary
A disclosed multilayer ceramic capacitor includes: a ceramic main body; a plurality of first internal electrodes and a plurality of second internal electrodes that are disposed inside the ceramic main body; and a first external electrode and a second external electrode that are disposed outside the ceramic main body. Each of the first and second external electrodes includes an electrode layer disposed on an end surface of the body and electrically connected to the first or second internal electrodes, a non-conductive resin layer disposed on at least one surface connected to the end surface of the ceramic main body and in contact with the electrode layer, and a conductive resin layer covering at least a portion of the non-conductive resin layer.