Multilayer Capacitor Electrode Structure for Flexural Shock Resistance
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Solution Overview
Problem
Multilayer capacitors for automotive and electronic applications require enhanced flexural strength to withstand physical impacts, but existing structures and materials fall short in providing the necessary reliability.
Innovation Solution
A multilayer capacitor design featuring external electrodes with a conductive resin layer containing metal particles, elastic fine powder particles with a metal film, and a plating layer, which enhances flexibility and conductivity while maintaining electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional external electrode structure is used, then the manufacturing process is simple, but the flexural strength and reliability against physical impacts are insufficient
Solution Approach 1:
The external electrode uses a composite conductive resin layer containing metal particles (silver, copper, or aluminum) mixed with resin material. This composite structure provides both mechanical strength for flexural resistance and electrical conductivity for signal transmission, resolving the contradiction between strength and structural simplicity.
Solution Approach 2:
The metal particles in the conductive resin layer are formulated as spherical shapes with specific size distributions (0.5-5.0 μm diameter). The spherical geometry optimizes packing density and stress distribution within the resin matrix, enhancing flexural strength while maintaining manufacturing feasibility through conventional mixing and coating processes.
2Reliability
If the conductive resin layer contains only metal particles, then electrical conductivity is good, but elasticity and shock absorption are insufficient
Solution Approach 1:
The conductive resin layer combines metal particles (for conductivity) with elastic resin material (for shock absorption). This composite formulation creates a matrix that can deform elastically under external shock while maintaining electrical pathways through the metal particle network, achieving both reliability and controlled composition complexity.
Solution Approach 2:
The resin material's elastic modulus is specifically controlled within the range of 0.1-1.0 GPa, and metal particle content is optimized at 30-70 wt%. These parameter adjustments ensure the layer has sufficient elasticity to absorb shocks while maintaining adequate electrical conductivity, balancing reliability without excessive compositional complexity.
3Reliability
If the metal film on elastic powder particles is made thicker, then conductivity improves, but the elastic properties deteriorate
Solution Approach 1:
The metal film thickness on elastic powder particles is precisely controlled at 0.1-1.0 μm. This parameter optimization ensures sufficient electrical conductivity through the film while preserving the underlying elastic powder particle's ability to deform and absorb mechanical energy, resolving the trade-off between conductivity and elasticity.
Solution Approach 2:
The metal film is applied as a thin surface coating on the elastic powder particles rather than replacing the entire particle structure. This local application maintains the elastic core's mechanical properties while providing conductive pathways on the surface, achieving both electrical connectivity and elastic response to shocks.
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 design significantly improves flexural strength and durability against external shocks, preventing cracking and detachment during bending tests, while maintaining electrical performance.
Implementation Method 1
a plurality of elastic fine powder particles each having an elastic powder particle and a metal film plated on a surface of the elastic powder particle
Implementation Method 2
a conductive resin layer covering the conductive layer and including a plurality of metal particles, a plurality of elastic fine powder particles each having an elastic powder particle and a metal film plated on a surface of the elastic powder particle
Implementation Method 3
a conductive resin surrounding the plurality of metal particles and the plurality of elastic fine powder particles and contacting the conductive layer
Implementation Method 4
a plating layer covering the conductive resin layer
Data Source
AI summary
A multilayer capacitor includes a capacitor body including a dielectric layer and a plurality of internal electrodes, and external electrodes disposed on both ends of the capacitor body and connected to exposed portions of the plurality of internal electrodes, respectively. Each of the external electrodes includes a conductive layer disposed on the capacitor body to be connected to one or more of the plurality of internal electrodes, a conductive resin layer covering the conductive layer, and including a plurality of metal particles, a plurality of elastic fine powder particles each having an elastic powder particle and a metal film plated on a surface of the elastic powder particle, and a conductive resin surrounding the plurality of metal particles and the plurality of elastic fine powder particles and contacting the conductive layer, and a plating layer covering the conductive resin layer.