Welding integration technology of medium- and high-temperature thermoelectric power generation devices and manufacturing tool

Abstract

The invention discloses a welding integration technology of medium- and high-temperature thermoelectric power generation devices and a manufacturing tool and belongs to the technical field of thermoelectric power generation device integration. The welding integration technology comprises the following steps of material sintering, surface treatment, connecting layer deposition, particle cutting, silk-screen printing, positioning assembly and welding. According to the welding integration technology and manufacturing tool of the invention, the screen printing technology is adopted to coat high-temperature soldering paste on the substrate electrode of a high-temperature thermoelectric device or the end face of the electrode of a thermoelectric material, and the vacuum welding process is also adopted, so that batch integrated development of the medium-and high-temperature thermoelectric devices is realized; on one hand, high-precision self-adhesion of the soldering paste can be achieved, the assembling complexity degree and the positioning difficulty are simplified, meanwhile, full contact between thermoelectric blocks and electrode bonding pads and between heterogeneous materials can be achieved through the soldering paste, and the welding quality at the high temperature and the size precision of the whole device are guaranteed; and on the other hand, the integration efficiency of the medium- and high-temperature thermoelectric devices is greatly improved.

Description

technical field [0001] The invention relates to the technical field of integration of thermoelectric power generation devices, in particular to a welding integration technology and tooling for medium and high temperature thermoelectric power generation devices. Background technique [0002] The implementation of the current carbon neutralization and carbon peaking strategy puts forward higher requirements for the efficient recycling of energy, and the thermoelectric power generation technology based on semiconductor materials is a static energy conversion technology with high reliability, long life, and miniaturization. It has a very broad application prospect in the field of low-grade waste heat recovery. [0003] At present, thermoelectric power generation devices are mainly divided into low-temperature devices, medium-temperature devices and high-temperature devices according to the working temperature. Among them, low-temperature devices usually use bismuth telluride mat...

AI Technical Summary

Problems solved by technology

However, the solid-state diffusion welding process puts forward high requirements on the processing and assembly accuracy of the device. If the processing tolerance of the material party is too large, it will easily lead to too low local welding strength, or poor dimensional consistency of the formed device; at the same time, the solid-state soldering piece The efficiency of positioning and assembly is also very low, which cannot meet the requirements of industrial mass production

In addition, in the integration of multi-level structure devices, due to the great difference in the temperature tolerance of different materials, the solid-state diffusion welding process cannot meet the simultaneous integration welding of multi-level heterogeneous interfaces at the same time.

Images