MLCC External Electrode Resin Layout for Arc and Moisture Control
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Solution Overview
Problem
Multilayer ceramic capacitors used in electronic devices, particularly in electric and autonomous vehicles, face challenges in achieving sufficient moisture resistance reliability and bending strength characteristics while maintaining low equivalent series resistance (ESR).
Innovation Solution
A multilayer electronic component design featuring a body with dielectric layers and alternately laminated internal electrodes, along with external electrodes that include an electrode layer and a conductive resin layer. A non-conductive resin layer is strategically disposed between the electrode and conductive resin layers, and between the electrode layers and the external surfaces, to enhance moisture resistance and suppress arc discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-layer structure including an electrode layer and a conductive resin layer is used to improve reliability and prevent plating liquid permeation, then moisture resistance and impact absorption are improved, but arc discharge may occur between the electrode layer and conductive resin layer
Solution Approach 1:
A non-conductive resin layer is introduced as an intermediary between the electrode layer and the conductive resin layer. This intermediate layer prevents direct contact between conductive components, thereby suppressing arc discharge while maintaining the moisture resistance and impact absorption benefits of the double-layer structure.
2Reliability
If the conductive resin layer is applied to absorb external impacts and prevent plating liquid permeation, then reliability is improved, but bending strength characteristics deteriorate
Solution Approach 1:
The non-conductive resin layer is selectively applied only in regions where it is needed to prevent arc discharge, while allowing other regions to maintain their original mechanical properties. This localized approach preserves bending strength while providing arc discharge suppression where conductive layers are present.
3Object-affected harmful factors
If a non-conductive resin layer is disposed between the electrode layer and conductive resin layer to suppress arc discharge, then arc discharge is suppressed, but electrical connectivity and equivalent series resistance (ESR) are affected
Solution Approach 1:
The non-conductive resin layer is segmented or patterned rather than forming a continuous layer, creating isolated regions that prevent arc discharge while leaving gaps that maintain electrical connectivity between the electrode layer and conductive resin layer where needed.
Data Source
AI summary
A multilayer electronic component has a body and a non-conductive resin layer. The non-conductive resin layer includes a body cover portion disposed in a region of an external surface of the body in which an electrode layer of an external electrode is not disposed, and an extending portion extending from the body cover portion between the electrode layer and a conductive resin layer of the external electrode, to thereby suppress arc discharge, improve bending strength, and improve moisture resistance.