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, especially in harsh environments, leading to electrode peeling and short circuits.
Innovation Solution
A multilayer ceramic electronic component design featuring a ceramic body with dielectric layers, internal and external electrodes, and auxiliary electrodes strategically placed 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 compact size requirements, then the component size is reduced, but the mechanical strength decreases and reliability deteriorates
Solution Approach 1:
The external electrode is segmented into multiple functional layers: first electrode layer for electrical connection, second electrode layer for environmental protection, and auxiliary electrode layer for mechanical reinforcement. This segmentation allows each layer to specialize in one function, enabling the miniaturized component to maintain mechanical strength while reducing overall size.
Solution Approach 2:
The auxiliary electrode layer uses a composite structure combining conductive material with enhanced mechanical properties. This composite approach allows the electrode to simultaneously provide electrical conductivity, mechanical reinforcement, and environmental protection, resolving the contradiction between miniaturization and mechanical strength maintenance.
2Ease of manufacture
If the external electrode structure is simplified, then the manufacturing process is easier, but moisture resistance and reliability deteriorate
Solution Approach 1:
The auxiliary electrode layer serves multiple functions simultaneously: it provides electrical conductivity for signal transmission, mechanical reinforcement to prevent cracking, and environmental protection by sealing the electrode-ceramic interface. This multi-functionality allows a single additional layer to address multiple reliability concerns without significantly complicating the manufacturing process.
3Adaptability or versatility
If the component is exposed to harsh environments, then the operational capability is maintained, but electrode peeling and moisture penetration occur due to oxidation and mechanical stress
Solution Approach 1:
The second electrode layer and auxiliary electrode layer are applied beforehand to create a protective barrier against oxidation and mechanical stress. This pre-protection structure cushions the internal electrodes from harsh environmental conditions, preventing electrode peeling and moisture penetration before they can occur during operation.
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 electrically 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 first electrode layers and an inflection point of the ceramic body. 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.