Capacitor Internal Electrode Composite Young's Modulus
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Solution Overview
Problem
Porous capacitors face issues with internal electrode stability and capacity value fluctuations due to thermal stress, leading to potential disconnection from the dielectric and external electrodes, which reduces their mechanical and electrical properties.
Innovation Solution
The capacitor design incorporates internal electrodes with two distinct conductive materials, one with a high Young's modulus for stability and another with a low Young's modulus for stress alleviation, connected via through-holes in the dielectric layer, ensuring improved resistance to thermal stress and maintaining capacity value stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal electrodes are formed in pores and connected to external conductors, then the capacitor achieves its basic electrical function, but the internal electrodes become unstable and may be disconnected due to thermal stress
Solution Approach 1:
The internal electrode is constructed as a composite structure with two different conductive materials: a first conductive material (higher Young's modulus) providing mechanical strength and stability, and a second conductive material (lower Young's modulus) that absorbs thermal stress. This composite configuration prevents electrode disconnection while maintaining electrical conductivity.
Solution Approach 2:
Different portions of the internal electrode are assigned different material properties: the first electrode portion uses a material with higher Young's modulus for structural stability, while the second electrode portion uses a material with lower Young's modulus for stress relief. This local differentiation of material quality optimizes both mechanical stability and thermal stress resistance.
2Manufacturing precision
If the internal electrode uses a single conductive material, then the structure is simple, but the capacity value fluctuates under thermal stress
Solution Approach 1:
The internal electrode employs a composite structure with two conductive materials having different Young's moduli. The first material provides structural integrity while the second material absorbs thermal expansion stress, thereby stabilizing the capacity value despite the increased structural complexity.
Solution Approach 2:
The invention changes the material parameter (Young's modulus) along the internal electrode structure. By selecting materials with different mechanical properties for different portions, the electrode can withstand thermal stress without capacity fluctuation, accepting the trade-off of more complex material selection and manufacturing.
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 configuration effectively prevents internal electrode disconnection and maintains capacity value stability under thermal stress, enhancing the capacitor's thermal stress resistance and electrical performance.
Implementation Method 1
the second conductive material having a smaller Young's modulus than the first conductive material
Data Source
AI summary
A capacitor includes a dielectric layer having a first plane, a second plane opposite to the first plane, and a plurality of through-holes communicated with the first and second planes; a first external electrode layer disposed on the first plane; a second external electrode layer disposed on the second plane; a first internal electrode having first and second electrode portions, the first and second electrode portions being formed of a first conductive material, and a second conductive material, respectively, the second electrode material connecting the first electrode portion with the first external electrode layer, the second conductive material having a smaller Young's modulus than the first conductive material, the first internal electrode being formed in a part of the plurality of through-holes; and a second internal electrode formed in another part of the plurality of through-holes, the second internal electrode being connected to the second external electrode layer.