Method for fabricating anode plate electrode of alkaline secondary battery

Abstract

The method includes following steps: (1) painting pulp of active material onto plate body of positive pole; (2) drying; (3) pressure molding; (4) setting up position for pole ear to be welded to positive pole plate with active material being painted; (5) carrying out reduction treatment under high temperature for pole ear positioned by using flame of reducing gas in order to convert the active material to conductive metal powder; (6) densifying the conductive metal powder at pole ear to be welded; (7) welding the pole ear. Comparing with ultrasonic method of cleaning up active material, the invention raises weldability, increases conduction effect at place of pole ear. The method also increases weld strength and reliability.

Description

technical field [0001] The invention relates to the manufacture of electrodes for batteries that directly convert chemical energy into electrical energy, and in particular to a method for manufacturing positive plates of alkaline secondary batteries Background technique [0002] Alkaline secondary batteries have the characteristics of high capacity, high power, and no pollution, and are one of the important development directions of batteries today. The positive electrode of the alkaline secondary battery is manufactured by the foamed nickel process, which has a high active material filling rate and lower manufacturing cost, and has gradually replaced the sintered process. The traditional foamed nickel positive plate manufacturing is to first weld the positive tab on the positive plate base, then coat the active material slurry, then dry, press, and finally cut into the specified size. Therefore, it is not suitable for The active material slurry is first coated on the posit...

AI Technical Summary

Problems solved by technology

This technical solution can solve the welding problem of the positive electrode tab in the continuous pulping process, but the ultrasonic treatment has the following defects: (1) The instantaneous high temperature generated during the ultrasonic removal of the active material will make the foamed nickel exposed to the air The matrix is ​​oxidized, which is manifested by yellowing of the nickel wire at the ear position after powder cleaning, which is likely to cause poor welding; (2) the instantaneous high temperature will also reduce the strength of the foamed nickel wire, and the nickel wire is easy to break and fall off under ultrasonic vibration. The nickel substrate is soaked or even perforated, resulting in a decrease in the welding strength of the tabs, resulting in desoldering; (3) Ultrasonic waves are used to remove active substances, and the removed active substance particles are scattered in the air, which will cause environmental pollution

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