Multilayer Capacitor Side Margin Structure for Crack Prevention
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Solution Overview
Problem
Multilayer ceramic capacitors face reliability issues due to step differences in internal electrode printing, leading to stress, delamination, and electrostriction cracks, particularly in high-voltage applications.
Innovation Solution
The multilayer electronic component incorporates side margin portions made of resin to cover the ends of connection electrodes, preventing cracks and enhancing reliability by reducing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a margin is present in the width direction during internal electrode printing, then the printing process is simpler and more conventional, but step differences accumulate in the margin portion leading to severe bending and delamination defects
Solution Approach 1:
The patent removes the margin portion from the width direction entirely, extracting the problematic accumulated step differences from the structure. By designing without a margin in the width direction and exposing the internal electrode, the invention eliminates the continuous accumulation of step differences that causes bending and delamination, while maintaining manufacturing simplicity through conventional printing processes.
2Strength
If the side margin portion is formed of ceramic material to maintain structural integrity, then the component maintains structural continuity, but cracks easily occur reducing reliability
Solution Approach 1:
The patent employs composite materials by forming the side margin portion with a resin material different from the ceramic body. This resin material specifically covers both ends of the connection electrode in the width direction, providing crack resistance and stress relief while maintaining structural integrity. The composite structure combines the electrical functionality of ceramic with the mechanical flexibility of resin to prevent cracks.
3Manufacturing precision
If the internal electrode area is increased by exposing the electrode in the width direction, then step differences are eliminated, but the side margin portion becomes more vulnerable to cracks
Solution Approach 1:
The patent introduces a resin material as an intermediary substance in the side margin portion that covers the exposed internal electrode ends. This resin mediator protects the vulnerable electrode ends from crack propagation while allowing the internal electrode to be exposed in the width direction for increased area and step difference elimination. The resin acts as a protective buffer between the ceramic body and the exposed electrode.
Data Source
AI summary
A multilayer electronic component includes a body including a capacitance formation portion including a dielectric layer and internal electrodes disposed alternately with the dielectric layer in a first direction, and cover portions disposed on both surfaces in the first direction of the capacitance formation portion, and including first and second surfaces opposing each other in the first direction, third and fourth surfaces connected to the first and second surfaces and connected to each other in a second direction, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other in a third direction; connection electrodes disposed on the third and fourth surfaces and connected to the internal electrode; side margin portions disposed on the fifth and sixth surfaces and including resin; and external electrodes disposed on the connection electrodes and including conductive metal and resin.