Method for primary sealing and secondary sealing protection of gas circuit interface of isotope thermoelectric cell

Abstract

The invention relates to a method for primary sealing and secondary sealing protection of a gas circuit interface of an isotope thermoelectric cell. The method comprises the following steps: manufacturing an atmosphere disposal interface and a protective cap; screwing and positioning the atmosphere disposal interface and a battery shell end cover, and carrying out sealed connection; combining an ultrasonic high-frequency oscillation principle with a specially-selected thin-wall aluminum alloy material and adopting an ultrasonic sealing machine to carryout sealing welding on the atmosphere disposal interface, thus completing primary sealing of the gas circuit interface; and sealing the protective cap for the second time, enabling an atmosphere disposal interface pipe body and a welded junction exposed out of the battery shell end cover to completely extend into the inner cavity of the protective cap, and welding the sealed protective cap at the circular seam of the step groove of the protective cap in an argon arc welding manner to finish secondary sealing protection. According to the invention, the interface sealing yield and sealing performance of the isotope thermoelectric cell are effectively improved, the safety of a thin-wall interface is enhanced, the interface sealing operation time is shortened, and the safety and reliability of the isotope thermoelectric cell, the on-orbit service life and the radiation safety of operators are effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of isotope thermoelectric batteries, and in particular relates to a method for sealing an atmosphere treatment interface of a metal sealed casing of a battery and a secondary sealing protection method for the sealed interface. Background technique [0002] Isotope thermoelectric batteries have the characteristics of compact structure, long life, high reliability, and independence from the external environment, and are widely used in deep space exploration missions. Since the internal working temperature of the product is as high as hundreds of degrees Celsius, in order to ensure the reliability and safety application requirements of the product, the product must be a fully sealed structure. Due to the characteristics of the product, it is necessary to carry out the atmosphere treatment inside the battery after the product has completed all the assembly and integration of the body. This makes it necessary to ...

AI Technical Summary

Problems solved by technology

However, since the interface connection pipe is usually a hollow thin-walled pipe, when the internal atmosphere of the battery is positive pressure, it is sealed by direct fusion welding, and the position of the weld is prone to air holes leading to leakage, so that through general fusion welding (such as TIG Argon arc welding) is difficult to achieve a sealed connection under positive pressure conditions

In addition, because the isotope thermoelectric battery is radioactive, if the sealing connection itself takes a long time, or requires multiple welding to achieve sealing, it will increase the exposure dose of the operator and cause unnecessary injury

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