Ceramic Multilayer Electrode Layout for Uniform Current Density
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Solution Overview
Problem
Ceramic multilayer components face challenges in designing internal electrodes to manage high current densities without damage, particularly in overvoltage protection elements and thermal sensors, where current density can exceed critical levels, and existing designs often result in oversized electrodes due to uniform material distribution.
Innovation Solution
The ceramic multilayer component features electrode layers with a decreasing current carrying capacity and specific electrical conductivity along the main extension direction, achieved through varying material composition and geometry, such as a mixture of conductive and insulating materials, and adjusted thickness and width, allowing for optimized current distribution and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform material distribution is used in electrode layers, then manufacturing is simplified, but current density becomes non-uniform leading to electrode damage at high current levels
Solution Approach 1:
The electrode layer is designed with spatially varying material composition and geometry. The cross-sectional area and material composition change along the main extension direction, creating locally optimized properties that match the current density distribution, with larger cross-sections and higher conductive material content in high-current regions
Solution Approach 2:
The patent varies physical parameters of the electrode layer including cross-sectional area, material composition ratio, and thickness along the main extension direction. These parameter changes are designed to compensate for current density variations, maintaining safe operating conditions throughout the electrode structure
2Reliability
If minimum cross-section of internal electrodes is increased to handle high current density, then current-carrying capacity improves, but material consumption and component size increase
Solution Approach 1:
Instead of uniformly increasing electrode cross-section throughout, the patent applies larger cross-sections and higher conductive material content only in regions where current density is highest (near external electrodes), while using smaller cross-sections in regions with lower current density, thereby optimizing material usage
Solution Approach 2:
The patent optimizes the cross-sectional area and material composition parameters along the electrode length to match local current density requirements, reducing material consumption while maintaining adequate current-carrying capacity where needed
3Reliability
If electrode layer geometry is optimized for current distribution, then current density uniformity improves, but manufacturing complexity increases
Solution Approach 1:
The patent implements localized geometric variations in the electrode layer, such as changing thickness or width in specific regions, rather than complex three-dimensional structures throughout, balancing current distribution improvement with manufacturing feasibility
Solution Approach 2:
The electrode layer can be divided into multiple zones with different geometric properties along the main extension direction, allowing independent optimization of each zone's current-carrying characteristics while maintaining overall structural simplicity
Data Source
Figure 1~2A
Figure 2B~2C
Figure 2D~3B
AI summary
The invention relates to a ceramic multi-layer component (100), which has a stack (1) of ceramic layers (2) and electrode layers (3, 4) arranged therebetween, wherein the ceramic layers and the electrode layers are arranged one above the other along a stack direction (S), at least one first electrode layer (3) extending along a main extension direction (H) from a first end region (31) to a second end region (32) of the first electrode layer and the at least one electrode layer having a current carrying capacity which decreases along the main extension direction. The invention further relates to a method for producing a ceramic multi-layer component.