Multilayer Ceramic Capacitor Auxiliary Electrode Design
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Solution Overview
Problem
Multilayer ceramic capacitors face reliability issues due to moisture penetration and mechanical weakness, particularly in harsh environments, leading to electrode peeling and short circuits.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with internal and external electrodes, and auxiliary electrodes disposed between the end portions of the external electrode layers and the ceramic body's inflection points, with the auxiliary electrode's width ranging from 20% to 70% of the internal electrode's margin width, enhancing mechanical strength and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the multilayer ceramic capacitor is miniaturized to meet electronic product requirements, then the capacity and compact size are improved, but the mechanical strength and reliability deteriorate
Solution Approach 1:
The external electrode is segmented into multiple layers (first electrode layer, second electrode layer, and auxiliary electrode layer), with each layer serving specific functions. This segmentation allows the electrode structure to maintain electrical functionality while enhancing mechanical strength through distributed stress coverage, resolving the contradiction between miniaturization and mechanical strength.
Solution Approach 2:
The patent employs composite material structures in the electrode system, combining different electrode layers with distinct properties. The auxiliary electrode layer acts as a composite structural element that provides both electrical connection and mechanical reinforcement, enabling the miniaturized capacitor to maintain sufficient mechanical strength.
2Reliability
If the multilayer ceramic capacitor operates in harsh environments, then the capacity and functionality are maintained, but moisture penetration and electrode peeling occur
Solution Approach 1:
The auxiliary electrode layer is preliminarily positioned between the end portion of the external electrode and the inflection point of the ceramic body before operation. This preliminary structural arrangement creates a protective barrier that prevents moisture penetration and electrode peeling during harsh environment operation, maintaining reliability.
Solution Approach 2:
The auxiliary electrode layer acts as an intermediary element between the external electrode and the ceramic body structure. This intermediary structure prevents direct contact and potential peeling between the electrode and ceramic surfaces, while also blocking moisture penetration paths, thus resolving the contradiction between maintaining functionality and preventing harmful environmental effects.
3Reliability
If the auxiliary electrode width is increased to improve moisture resistance, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The auxiliary electrode layer is applied with local quality considerations, with its width specifically controlled to be 20-70% of the internal electrode width. This localized dimensional control provides sufficient moisture resistance and mechanical support at critical locations without unnecessarily increasing overall device complexity.
Solution Approach 2:
The patent optimizes the auxiliary electrode width parameter within a specific range (20-70% of internal electrode width) to achieve the best balance between moisture resistance and structural simplicity. This parameter optimization ensures adequate protection against moisture penetration while avoiding excessive device complexity.
Data Source
AI summary
A multilayer ceramic electronic component includes a ceramic body including a dielectric layer, and first and second internal electrodes disposed to oppose each other with the dielectric layer therebetween; first and second external electrodes having first electrode layers connected to the first and second internal electrodes, respectively, and second electrode layers disposed on the first electrode layers, respectively; and an auxiliary electrode disposed between an end portion of each of the second electrode layers and an inflection point of the ceramic body, wherein a width of the auxiliary electrode is in a range of 20 to 70% of a width of a margin portion of the first or second internal electrode.