Multilayer Ceramic Capacitor Electrode Structure Against Hydrogen Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multilayer ceramic capacitors face issues with insulation resistance deterioration due to hydrogen absorption during the plating layer formation process, which affects their reliability.
Innovation Solution
The multilayer ceramic capacitor design includes an inner glass layer on the inner base electrode layer, connected to an outer electrode through a plating layer, which reduces hydrogen absorption and maintains insulation resistance by minimizing the alloy area between the electrode and plating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plating layer is formed on the outer electrode during manufacturing, then the electrical conductivity and connection reliability are improved, but hydrogen is generated by chemical reaction and absorbed into inner electrodes, causing insulation resistance deterioration
Solution Approach 1:
A barrier layer is introduced between the plating layer and the outer electrode to act as an intermediary that prevents hydrogen generated during plating from penetrating into the inner electrodes. This barrier layer serves as a mediating structure that allows electrical connection while blocking hydrogen diffusion paths.
Solution Approach 2:
The outer electrode structure is segmented into multiple functional layers: the plating layer for electrical connection, the barrier layer for hydrogen prevention, and the outer electrode base for structural support. This segmentation allows each layer to perform its specific function independently, resolving the conflict between conductivity and hydrogen absorption.
2Ease of manufacture
If the plating layer is directly formed on the outer electrode, then the manufacturing process is simple, but the insulation resistance deteriorates due to hydrogen absorption in inner electrodes
Solution Approach 1:
The barrier layer serves as an intermediary structure that is relatively simple to manufacture (can be applied as a thin coating) but provides critical protection against hydrogen absorption. This adds minimal manufacturing complexity while significantly improving insulation resistance reliability.
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
This design effectively reduces hydrogen absorption, preventing insulation resistance degradation and enhancing the reliability of the capacitor.
Implementation Method 1
hydrogen generated by a chemical reaction during a plating layer formation process is absorbed into inner electrodes
Data Source
AI summary
A multilayer body includes a first surface and a second surface opposite each other in a lamination direction, a third surface and a fourth surface opposite each other in a first direction, and a fifth surface and a sixth surface opposite each other in a second direction orthogonal. An inner layer portion includes an inner dielectric layer and an inner electrode laminated on the inner dielectric layer in the lamination direction. The inner electrode includes an end portion at the fifth surface. An outer electrode on the fifth surface includes an inner base electrode layer on the inner layer portion at the fifth surface and connected to the inner electrode, an inner glass layer on the inner base electrode layer, a plating layer on the inner glass layer, and a connecting portion penetrating through the inner glass layer and electrically connecting the inner base electrode layer to the plating layer.