Multilayer Ceramic Capacitor Bending Strength via Dummy Electrodes

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Solution Overview

Problem

Multilayer ceramic capacitors with high voltage and low capacitance characteristics face challenges in securing bending strength due to the reduced number of stacked internal electrodes.

Innovation Solution

Incorporating a capacitance forming part with floating electrodes and a protective part featuring dummy electrodes within the ceramic body, where the dummy electrodes are strategically positioned to enhance bending strength without compromising capacitance, and the electrodes are designed to overlap and connect appropriately to improve structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the number of stacked internal electrodes is reduced to achieve high voltage and low capacitance characteristics, then the voltage rating and capacitance performance are improved, but the bending strength of the ceramic body deteriorates

Engineering Contradiction:

Improvevoltage rating and capacitance performanceVSAvoidbending strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The electrode structure is segmented into three distinct types: first internal electrodes connected to external electrodes, second internal electrodes forming floating electrodes not connected to external electrodes, and third internal electrodes disposed in the protective part. This segmentation allows the capacitor to achieve high voltage rating through the floating electrode configuration while maintaining bending strength through the distributed electrode structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the ceramic body are assigned different electrode configurations: the capacitance forming part has a specific arrangement of internal electrodes for electrical performance, while the protective part has a different arrangement optimized for mechanical strength. The floating electrodes are strategically positioned to provide both electrical isolation for high voltage capability and structural support for bending strength.

Inventive Principle:

Principle #3Local quality

2Reliability

If the number of stacked internal electrodes is reduced to achieve high voltage characteristics, then the voltage rating is improved, but the adhesive strength between internal and external electrodes deteriorates

Engineering Contradiction:

Improvevoltage ratingVSAvoidadhesive strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The electrode system is divided into multiple functional groups with distinct connection configurations. The first internal electrodes provide primary electrical connection to external electrodes, the second internal electrodes create floating potential regions for voltage stress distribution, and the third internal electrodes in the protective part enhance interfacial adhesion. This segmentation allows optimization of both voltage rating and adhesive strength independently.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The floating electrodes and protective part electrodes are pre-configured during manufacturing to establish optimal stress distribution patterns before the component is subjected to operational voltage or mechanical stress. This preliminary structural arrangement ensures that adhesive bonds are formed at multiple strategic locations, preventing delamination under high voltage conditions.

Inventive Principle:

Principle #10Preliminary action

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 solution effectively increases the bending strength of multilayer ceramic capacitors while maintaining high capacitance, addressing the structural weaknesses associated with fewer internal electrodes, and enhances adhesive strength between internal and external electrodes.

Implementation Method 1

a capacitance forming part in which a plurality of first and second dielectric layers are alternately stacked in a thickness direction of the ceramic body

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

first and second dielectric layers are alternately stacked in a thickness direction of the ceramic body

Methodology Applied

Scientific EffectDielectric: Dielectric

Data Source

PatentUS10283267B2Multilayer ceramic electronic component and board having the same

Publication Date: 2019.05.07 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A multilayer ceramic electronic component includes: a ceramic body including a capacitance forming part in which first and second dielectric layers are alternately disposed; and external electrodes disposed on both end surfaces of the ceramic body. The capacitance forming part includes first and second internal electrodes, first floating electrodes, and second floating electrodes. The ceramic body further includes a protective part having third dielectric layers on which first and second dummy electrodes exposed to the end surfaces of the ceramic body are disposed and a third dummy electrode is disposed between the first and second dummy electrodes.