Capacitor Component With Plating Layers For Humidity Resistance
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face challenges in achieving reliable humidity resistance, which is critical for their performance in compact, high-performance electronic devices and severe conditions encountered in automotive applications.
Innovation Solution
The capacitor component design includes a body with dielectric and internal electrodes, external electrodes with plating layers, and humidity-resistant layers to prevent moisture ingress, enhancing reliability by blocking humidity permeation paths and sealing potential cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capacitor structures are used, then manufacturing is simpler, but humidity resistance reliability deteriorates
Solution Approach 1:
The external electrode is segmented into multiple functional layers: a base external electrode layer and an additional plating layer with specific patterns. This segmentation allows different regions to serve different purposes - the plating layer provides humidity resistance at critical areas while the base layer maintains electrical connectivity, thereby improving humidity resistance reliability without requiring complete structural redesign.
Solution Approach 2:
The plating layer is applied selectively to specific regions of the external electrode rather than uniformly across the entire surface. The patterned plating covers areas prone to humidity ingress (such as edges and connection regions) while leaving other areas with standard electrode material. This local quality approach targets humidity protection where most needed, improving reliability without excessive complexity.
2Volume of moving object
If the capacitor size is reduced for compact devices, then device compactness is improved, but humidity resistance reliability deteriorates
Solution Approach 1:
Instead of increasing the size of individual electrode elements to improve humidity resistance, the solution adds a dimensional layer (the plating layer) on top of the existing electrode structure. This vertical addition provides enhanced humidity protection through the extra material layer and patterned coverage, compensating for the reduced overall capacitor dimensions and maintaining reliability in compact form factors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly improves humidity resistance reliability, ensuring the capacitors' performance in harsh conditions and minimizing defects and acoustic noise during mounting.
Implementation Method 1
plating layers disposed on the first and second band portions... The first and second plating layers are disposed in the openings of the humidity resistant layers, respectively, and are in contact with the first and second band portions, respectively
Implementation Method 2
humidity resistant layers disposed between the first and second external electrodes, disposed on the first and second external electrodes... blocking humidity permeation paths and sealing potential cracks
Data Source
AI summary
A capacitor component includes: a body including a dielectric layer and first and second internal electrodes alternately disposed with the dielectric layer interposed therebetween; first and second external electrodes including first and second connection portions, and first and second band portions extending onto portions of a surface from the first and second connection portions, respectively; first and second plating layers disposed on the first and second band portions, respectively; humidity resistant layers disposed between the first and second external electrodes, disposed on the first and second external electrodes, and having openings respectively exposing portions of the first and second band portions. The first and second plating layers are disposed in the openings of the humidity resistant layers, respectively, and are in contact with the first and second band portions, respectively.