Multilayer Ceramic Capacitor Electrode Segmentation and Glass Buffering
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Solution Overview
Problem
Multilayer ceramic capacitors face issues with positional deviations of inner electrodes during manufacturing, leading to reduced capacitance generation and mounting stability, and compromised moisture resistance reliability due to the stacking of a large number of inner electrodes.
Innovation Solution
The design includes a ceramic body with a specific configuration of inner and outer electrodes, where the connection proportion of inner electrodes to outer electrodes is between 30% to 70%, with glass present between unconnected inner electrodes, and the use of auxiliary electrodes and boundary layers containing Mg and Mn to enhance stability and reduce positional deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of inner electrodes are stacked to achieve higher capacitance, then capacitance increases, but the distance between inner electrodes and ceramic body surfaces decreases causing reduced moisture resistance reliability
Solution Approach 1:
The patent divides the inner electrodes into two groups: connected inner electrodes (electrically connected to outer electrodes) and unconnected inner electrodes (not electrically connected to outer electrodes). This segmentation allows the unconnected inner electrodes to maintain larger distances from ceramic body surfaces, preventing moisture ingress while the connected inner electrodes provide the required capacitance. The division resolves the contradiction by separating the functional requirements of capacitance generation from moisture protection.
2Quantity of substance
If inner electrodes are stacked closer together to increase capacitance, then capacitance increases, but positional deviations occur during manufacturing reducing mounting stability
Solution Approach 1:
The patent introduces glass as an intermediary substance present between unconnected inner electrodes and outer electrodes. This glass layer acts as a buffer that compensates for positional deviations during manufacturing processes. The glass fills gaps and accommodates misalignments, ensuring that even when inner electrodes are stacked closely together, the structural integrity and mounting stability are maintained while preventing direct contact that would exacerbate positional deviations.
3Reliability
If the connection proportion of inner electrodes is increased to improve electrical performance, then electrical performance improves, but the area of effective region for capacitance generation decreases
Solution Approach 1:
The patent applies different electrical connection configurations to different regions of inner electrodes. Specifically, only certain inner electrodes are electrically connected to outer electrodes (connected inner electrodes), while others remain unconnected. This local differentiation optimizes the electrical performance by ensuring proper connectivity where needed while preserving capacitance generation area in regions with unconnected inner electrodes. The connection proportion is controlled within 30-70% to balance electrical performance and capacitance generation.
Data Source
AI summary
In a multilayer ceramic capacitor, a ceramic body includes dielectric layers and inner electrodes stacked in a stacking direction, outer electrodes on the ceramic body and connected to the plurality of inner electrodes. When viewing a first cross section of the ceramic body parallel or substantially parallel to first and second side surfaces of the ceramic body and having the plurality of inner electrodes exposed, a connection proportion is about 30% to about 70% and is a proportion of a number of the inner electrodes connected to the outer electrodes to a number of all of the plurality of inner electrodes exposed at the first cross section, and when the first cross section is viewed, glass is present between one of the inner electrodes not connected to each of the outer electrodes, and each of the outer electrodes.