Multilayer Coil External Electrode Segmentation for Thermal Peeling
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Solution Overview
Problem
Multilayer coil components face characteristic deterioration due to peeling of external electrodes caused by differences in thermal expansion or contraction between the element body and external electrodes, leading to electrical and magnetic property degradation.
Innovation Solution
The multilayer coil component design includes an external electrode configuration where the electrode conductors are positioned in a way that they are not in the same layer as the second and third coil conductors, with specific conductor parts overlapping and connecting to maintain electrical connection, reducing the volume of the external electrode relative to the element body, and ensuring it does not peel off even with thermal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external electrode is made larger to ensure adequate electrical connection, then the electrical connection is improved, but the external electrode is more prone to peeling off due to thermal expansion differences
Solution Approach 1:
The patent transitions from a planar electrode configuration to a three-dimensional structure by having the external electrode extend in multiple directions (first direction along the element body length, second direction protruding from the surface). This spatial arrangement reduces the electrode's volume relative to the element body while maintaining adequate electrical connection through multi-point contact.
Solution Approach 2:
The external electrode is divided into multiple electrode conductors (first outermost, second outermost, and intermediate electrode conductors) that are distributed across different layers. This segmentation allows the electrical connection to be maintained through multiple discrete contact points rather than requiring a large continuous electrode area.
2Strength
If the external electrode volume is reduced to prevent peeling, then peeling resistance is improved, but the electrical connection may be compromised
Solution Approach 1:
The electrode conductors extend in multiple spatial dimensions - along the first direction within the element body and in the second direction protruding from the surface. This multi-dimensional arrangement allows the electrode to maintain adequate electrical connection with minimal volume, as the connection is achieved through distributed contact along the length rather than through large surface area.
Solution Approach 2:
The electrode conductors are strategically positioned at specific locations (outermost positions and intermediate positions) rather than being uniformly distributed. This localized placement optimizes the electrical connection at critical points while minimizing the overall electrode volume and reducing thermal mass that could contribute to peeling.
3Device complexity
If the electrode conductors are positioned in the same layer as all coil conductors, then the electrical connection is simplified, but the external electrode volume increases causing peeling
Solution Approach 1:
The electrode conductors are segmented into different groups positioned in different layers: first and second outermost electrode conductors in one layer, and intermediate electrode conductors in another layer. This layering distributes the electrode volume along the first direction while maintaining electrical connection through vertical overlaps with coil conductors, thereby reducing the electrode's volume relative to the element body and improving peeling resistance.
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 suppresses the deterioration of the multilayer coil component's characteristics by maintaining a reliable electrical connection and preventing external electrode peeling, thus improving mountability and performance on electronic devices.
Implementation Method 1
The peeling of the external electrode is attributable to the difference in coefficient of thermal expansion or thermal contraction between the element body and the external electrode
Data Source
AI summary
A multilayer coil component includes an element body, a coil, and an external electrode. The element body includes a main surface, side surfaces opposing each other in a first direction, and end surfaces opposing each other in a second direction. The external electrode is electrically connected to the coil. The coil includes a plurality of coil conductors disposed in the first direction. The external electrode includes a plurality of electrode conductors disposed in the first direction. The plurality of coil conductors include coil conductors positioned in the same layer as the plurality of electrode conductors and coil conductors not positioned in the same layer as any of the plurality of electrode conductors.