MLCC Electrode Layout to Prevent Interlayer Peeling
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Solution Overview
Problem
Miniaturization and increased capacitance in multilayer ceramic capacitors lead to reduced anti-fracture strength and a higher likelihood of dielectric layers peeling off from internal electrode layers, as the volume of non-electrode regions decreases, necessitating measures to prevent interlayer peeling.
Innovation Solution
The design features a multilayer ceramic capacitor configuration where the lead-out portion of internal electrode layers has a narrower width than the opposing portion, with specific relationships between their widths, thicknesses, and deviations, and includes rounded corner portions and varying thicknesses to enhance contact area and prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is miniaturized and increased in capacitance, then the size of the capacitor is reduced, but the anti-fracture strength is reduced and interlayer peeling is more likely to occur
Solution Approach 1:
The patent applies local quality by making the lead-out portion of the internal electrode layer narrower than the opposing portion. This creates a localized structural difference that reduces stress concentration at the interface between the internal electrode layer and dielectric layer, thereby preventing interlayer peeling while maintaining the overall miniaturized structure of the capacitor.
2Ease of manufacture
If the lead-out portion has the same width as the opposing portion, then the manufacturing is simpler, but the connection efficiency and moisture resistance are reduced
Solution Approach 1:
The patent implements local quality by creating a narrower lead-out portion compared to the opposing portion. This localized structural change improves connection efficiency and moisture resistance without fundamentally altering the manufacturing process, as it can be achieved through standard lamination and sintering techniques.
Solution Approach 2:
The patent applies curvature by rounding the corner portions of the internal electrode layer. This rounded configuration reduces stress concentration at sharp corners, improves the connection area with adjacent layers, and enhances moisture resistance by eliminating sharp edges where moisture could penetrate, thereby improving reliability.
Data Source
AI summary
A multilayer ceramic capacitor includes an element body portion including dielectric layers and internal electrode layers laminated in a thickness direction, and external electrodes respectively on first and second end surfaces and electrically connected to the internal electrode layers. Each of the internal electrode layers includes an opposing portion opposed to another internal electrode layer, and a lead-out portion connected to the opposing portion and extending to the first or second end surface, a width of the opposing portion is larger than a width of the lead-out portion in the width direction, and a relationship of C1>C2 is satisfied when a continuity of an end portion of the opposing portion in the width direction is defined as C1 and a continuity of an end portion of the lead-out portion in the width direction is defined as C2.