Laminated Coil Electrode Recess Structure for Lower DC Resistance
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Solution Overview
Problem
Existing laminated coil components face challenges in reducing direct current resistance while maintaining a compact size, as methods to reduce resistance, such as thick outer electrodes, lead to increased volume and potential lower mounting density.
Innovation Solution
A laminated coil component design featuring depressions on the end surfaces of the multilayer body, with outer electrodes covering these depressions, allowing for increased thickness without altering the outer appearance, thus reducing current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outer electrodes are made thick to reduce direct current resistance, then current density is reduced, but the volume of the component increases
Solution Approach 1:
The patent applies the nesting principle by forming the thick outer electrode within a depression (concave portion) on the end surface of the multilayer body. The electrode is nested inside the depression rather than extending outward, allowing the electrode thickness to be increased without increasing the overall component volume. This resolves the contradiction between needing thick electrodes for low resistance and maintaining compact component dimensions.
Solution Approach 2:
The patent transitions from a flat surface electrode configuration to a three-dimensional depression-based configuration. By utilizing the depth dimension of the depression, the electrode can achieve greater thickness while the horizontal footprint remains constrained. This dimensional approach allows the electrode to extend inward rather than outward, reducing current density without increasing the component's external dimensions.
2Loss of energy
If outer electrodes are made thick to reduce current density, then heat generation is reduced, but mounting density decreases due to increased volume
Solution Approach 1:
By nesting the thick electrode within the depression, the overall component volume is maintained while achieving the necessary electrode thickness for reduced current density and heat generation. This allows the component to maintain compact dimensions suitable for high-density mounting while still reducing energy loss through lower heat generation.
Solution Approach 2:
The depression is created locally at specific positions on the end surface, allowing the thick electrode to be concentrated where it is most needed for current flow, while the rest of the component maintains its original compact form factor. This localized approach enables heat reduction without compromising mounting density.
Data Source
AI summary
A laminated coil component includes a multilayer body including laminated insulation layers and a coil inside; and first and second outer electrodes electrically connected to the coil. The coil is composed of coil conductors laminated together with the insulation layers and electrically connected to one another. The multilayer body has first and second end surfaces opposed to each other in a longitudinal direction, a first and second main surfaces opposed to each other in a height direction orthogonal to the longitudinal direction, and first and second side surfaces opposed to each other in a width direction orthogonal to the longitudinal direction and the height direction. The first outer electrode covers at least part of the first end surface, the second outer electrode covers at least part of the second end surface, and a coil axis of the coil is parallel to the first main surface.