Multilayer Ceramic Capacitor Corner Sealing for Infiltration Prevention
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with infiltration of foreign substances through corner portions, leading to degradation of insulation resistance and reliability, especially in ultra-high capacitance devices with thin covers and narrow margins, where increased internal electrode overlap is required for high capacitance.
Innovation Solution
The design includes a ceramic sintered body with dielectric layers and internal electrodes, where sealing parts enclose both end and corner portions, and external electrodes are formed to be electrically connected to lead-out portions, with a specific ratio of exposed lead-out portion length to ceramic body width to prevent infiltration, and margin portions are strategically placed to enhance capacitance while minimizing foreign substance ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cover is made thin and margins are narrowed to achieve ultra-miniaturization, then the size is reduced, but foreign substances infiltrate through corner portions causing deterioration of insulation resistance and reliability
Solution Approach 1:
The external electrode is segmented into a body electrode portion and a terminal electrode portion, with the terminal electrode extending beyond the corner portions of the ceramic body. This segmentation allows the terminal electrode to act as a protective barrier that prevents foreign substances from infiltrating through the corner portions while maintaining the thin cover and narrow margins for miniaturization.
Solution Approach 2:
The terminal electrode is designed to extend in advance beyond the corner portions of the ceramic body before any potential infiltration can occur. This preliminary extension creates a protective barrier that preemptively blocks the infiltration path of foreign substances, plating liquid, or moisture through the corner portions.
2Quantity of substance
If internal electrode overlapping areas are significantly increased to achieve ultra-high capacitance, then capacitance is increased, but the margin for error becomes narrow and infiltration risk increases
Solution Approach 1:
The external electrode is divided into body electrode and terminal electrode portions, with the terminal electrode extending beyond the ceramic body corners. This segmentation allows the terminal electrode to serve as a protective barrier that prevents foreign substance infiltration, enabling the internal electrodes to be closely spaced for high capacitance without compromising reliability.
3Volume of moving object
If external electrodes are made thinner over corner portions to reduce size, then miniaturization is achieved, but conductive foreign substances infiltrate through corner portions
Solution Approach 1:
The external electrode is segmented into a body electrode portion that covers the corner portions and a terminal electrode portion that extends beyond them. This segmentation ensures that the corner portions are covered by conductive material (preventing infiltration) while the overall electrode structure remains compact for miniaturization.
Solution Approach 2:
The terminal electrode extends in advance beyond the corner portions to create a protective barrier before foreign substances can infiltrate. This preliminary extension ensures that even though the cover is thin and margins are narrow, the corner portions are protected from infiltration by the extended terminal electrode.
Data Source
AI summary
There is provided a multilayer ceramic electronic component, including: a ceramic sintered body having a plurality of dielectric layers laminated therein; first and second capacitance portions being formed on surfaces of the dielectric layers; first and second lead-out portions being respectively extended from both sides of the first and second capacitance portions to be respectively exposed through both side surfaces of the ceramic sintered body and spaced apart from each other; sealing parts enclosing both end portions and corner portions of the ceramic sintered body; and first and second external electrodes enclosing the sealing parts and formed on both end portions of the ceramic sintered body to be electrically connected to the first and second lead-out portions, respectively.