MLCC Shock Absorbing Layer for Warpage Strength

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Solution Overview

Problem

Multilayer capacitors face challenges in achieving high warpage strength and reliability against mechanical stress, particularly in applications involving strong vibrations, such as in vehicles, due to their vulnerability to external mechanical stress.

Innovation Solution

Incorporating a shock absorbing layer with a longer length than the conductive resin layer between the capacitor body and the external electrode, formed from an insulating material with a metal content of 50 wt % or less, including silica, glass, and zirconium dioxide as fillers, to enhance mechanical stability while maintaining electrical connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a conventional external electrode structure is used, then the manufacturing process is simple, but the warpage strength and reliability under mechanical stress are insufficient

Engineering Contradiction:

Improvewarpage strengthVSAvoidexternal electrode structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The external electrode is segmented into multiple functional layers: a conductive resin layer for electrical connectivity and a shock absorbing layer for mechanical protection. This segmentation allows each layer to specialize in its function, improving warpage strength while maintaining manufacturing feasibility through established layering processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shock absorbing layer acts as an intermediary between the capacitor body and the conductive resin layer, absorbing mechanical stress and preventing it from transmitting to the fragile capacitor body. This mediator layer protects the internal structure while allowing the external electrode to maintain its electrical function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the shock absorbing layer length is increased to improve stress distribution, then the warpage strength improves, but the device dimensions increase

Engineering Contradiction:

Improvewarpage strengthVSAvoidexternal electrode length

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The shock absorbing layer is applied selectively at critical stress points and regions where mechanical stress concentrates, rather than uniformly across the entire external electrode. This localized application provides maximum protection with minimal increase in overall device dimensions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The external electrode uses a composite structure combining conductive resin material and shock absorbing material with different mechanical properties. This composite approach allows the electrode to maintain electrical conductivity while gaining enhanced mechanical strength and stress resistance without proportionally increasing size.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS11562859B2MLCC module and method of manufacturing the same

Publication Date: 2023.01.24 SAMSUNG ELECTRO MECHANICS CO LTD

AI summary

A multilayered capacitor includes a shock absorbing layer disposed between an upper layer of a capacitor body and a conductive resin layer of an external electrode and between a lower layer of the capacitor body and the conductive resin layer of the external electrode. A length of the shock absorbing layer is longer than that of the conductive resin layer, thereby improving warpage strength characteristics of the capacitor body.