Laminated Thermoelectric Element Insulating Layer Spacing
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Solution Overview
Problem
Laminated thermoelectric conversion elements face increased resistance when adjacent p-type and n-type thermoelectric conversion material layers directly abut, leading to reduced power generation due to narrowed contact areas.
Innovation Solution
The laminated body features alternating p-type and n-type thermoelectric conversion layers with insulating layers positioned to extend from heat absorption and release surfaces, creating a serpentine current flow path and maintaining adequate spacing between the layers to prevent significant narrowing of contact areas, even after barrel polishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating layers are made to extend fully between heat absorption and release surfaces, then electrical insulation is improved, but current flow path is blocked and power generation decreases
Solution Approach 1:
The insulating layers are designed with varying lengths: in the intermediate portion between heat absorption and release surfaces, the insulating layers extend fully to ensure electrical insulation, while at the end portions near the heat absorption and release surfaces, the insulating layers do not extend fully, leaving spaces that allow current flow. This local differentiation of insulating layer length resolves the contradiction by providing insulation where needed while maintaining current pathways where power generation is required.
2Manufacturing precision
If barrel polishing is applied to the laminated body, then surface finish is improved, but the interface area between adjacent thermoelectric layers is reduced, increasing resistance
Solution Approach 1:
The insulating layers are designed to extend beyond the interface regions between adjacent thermoelectric conversion layers before polishing. This preliminary extension creates a buffer zone that compensates for the material removed during barrel polishing, ensuring that the interface area between thermoelectric layers is maintained even after the polishing process improves surface finish.
3Reliability
If insulating layers are positioned to prevent interface narrowing, then resistance is reduced, but device complexity increases due to varied insulating layer lengths
Solution Approach 1:
The insulating layers are segmented into different length portions: intermediate portions that extend fully between heat absorption and release surfaces for insulation, and end portions near the heat absorption and release surfaces that are shorter to allow current flow. This segmentation allows the insulating layers to perform multiple functions at different locations, reducing resistance while avoiding the need for completely complex insulation schemes.
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 a nonnegligible increase in resistance value, ensuring efficient power generation by maintaining adequate spacing between p-type and n-type thermoelectric conversion material layers, thereby reducing the impact of barrel polishing on the interface area.
Implementation Method 1
The p-type thermoelectric conversion material has a positive Seebeck coefficient, the n-type thermoelectric conversion material has a negative Seebeck coefficient. When a temperature difference is applied, holes (+) move in the p-type thermoelectric conversion material layers, whereas electrons (−) move in the n-type thermoelectric conversion material layers.
Data Source
AI summary
A plurality of p-type and n-type thermoelectric conversion layers extend between opposed heat absorption and heat release surfaces such that the layers alternate between the p-type and n-type thermoelectric conversion layers with a respective insulating layer located between each adjacent pair of thermoelectric conversion layers. Each of the insulating layers extends from a respective one of the heat absorption and heat release surfaces towards, but does not reach, the other of the heat absorption and heat release surfaces such that each insulating later is spaced from the other of the heat absorption and heat release surfaces by a respective length. First and second outer sets of insulating layers are located closest to the first and second end surfaces, respectively, The insulating layers of the first and second outer sets are spaced from the other of the heat absorption and heat release surfaces by a length which is longer than the insulating layers located inwardly of the first and second outer sets.