Preparation method of bimetallic strip of magnesium alloy and silver-plated copper foil

Abstract

Provided is a preparation method of a bimetallic strip of a magnesium alloy and a silver-plated copper foil. By using the method, a thicker magnesium alloy plate and the silver-plated copper foil canbe firmly welded, so that the problem of short discharging time of a battery caused by reaction hole etching of a magnesium alloy negative electrode of the water-activated battery is solved. Accordingto the preparation method of the bimetallic strip of the magnesium alloy and the silver-plated copper foil, the magnesium alloy is welded to the silver-plated copper foil at the welding temperature of 380-400 DEG C; the welding temperature provides proper energy for atomic diffusion, atomic diffusion is sufficient, large-grain grain boundaries migrate out of an initial connection position, commoncrystal grains are generated between the connecting grain boundaries, the good diffusion welding joint tissue is generated, welding is firm, the grain growth and diffusion are uniform under the temperature, the magnesium alloy is uniform in surface reaction when used as the negative electrode, battery failure due to hole etching is avoided, and the battery can be discharged for a long time, so that the working time of the long-service-life seawater battery is prolonged to 9 h from the original 5h.

Description

technical field [0001] The invention belongs to the technical field of seawater batteries, and in particular relates to a method for preparing bimetallic sheets of magnesium alloy and silver-plated copper foil. Background technique [0002] Magnesium-silver chloride long-life seawater battery is used as a buoy power source due to its characteristics of fast activation, long working time, long storage life, and safe use. The negative electrode magnesium alloy and the isolation metal foil are bonded together by the surrounding of the adhesive coating film, but due to the uneven reaction of the negative electrode magnesium alloy, pitting corrosion is easy to occur, and the electrolyte enters between the negative electrode and the isolation metal foil, causing the internal resistance of the battery to decrease. increase, the battery discharge time is shortened, and even cannot meet the usage requirements. Moreover, the gluing process is time-consuming and laborious, and the dai...

AI Technical Summary

Problems solved by technology

The negative electrode magnesium alloy and the isolation metal foil are bonded together by the surrounding of the adhesive coating film. However, due to the uneven reaction of the negative electrode magnesium alloy, pitting corrosion is easy to occur, and the electrolyte enters between the negative electrode and the isolation metal foil, causing the internal resistance of the battery to decrease. increase, the battery discharge time is shortened, and even cannot meet the use requirements

Moreover, the gluing process is time-consuming and laborious, and the daily production volume is limited, and the adhesive is harmful to human health.

Publication No. CN106808078A "A Diffusion Welding Method for Dissimilar Metals" The welding technology provided by the patent makes the hydrogen evolution of the battery too large, and the paper "The Influence of Vacuum Diffusion Welding on the Performance of Magnesium Alloy Electrodes" ("Power Technology", 2011 No. 5, pp. 537-539) the vacuum diffusion welding technology provided cannot completely weld thicker and large-area magnesium alloy weldments

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