A method for controlling electrode switching of a three-electrode zinc-air battery or battery pack

Abstract

The invention relates to an electrode switching control method of a three-electrode zinc air battery or a battery pack, and belongs to the field of energy storage and power supply. The zinc air battery is a three-electrode system, and comprises an air electrode, a charging electrode and a zinc electrode, wherein the charging electrode and the zinc electrode form a working circuit when the batteryis charged, and the air electrode and the zinc electrode form a working circuit when the battery discharges. According to the present invention, during the charging and the discharging of the zinc airbattery, the air electrode and the charging electrode in the battery are automatically switched according to the current change in the charging and discharging process, such that the electrode switching problem in the charging and discharging process of the battery is solved, the synchronization of the electrode switching and the charging-discharging working is achieved, the air electrode can beprevented from high-potential corrosion, and the service life of the air electrode and the cycle life of the battery are increased.

Description

technical field [0001] The invention belongs to the field of energy storage and power supply, and in particular relates to an electrode switching control method of a three-electrode zinc-air battery or a battery pack. Background technique [0002] Zinc-air batteries are one of the important technical directions for efficient conversion and large-scale storage of electrical energy. The battery utilizes oxygen in the air as the positive electrode electrochemical reaction active material, and metal zinc as the negative electrode electrochemical reaction active material. During the operation of the battery, the metal electrode is dissolved or deposited, and the discharge product is dissolved in the alkaline electrolyte; the oxygen in the air is used to perform oxygen reduction (ORR) or oxygen evolution (OER) electrochemical reaction on the air electrode to complete the electrical energy and The mutual conversion of chemical energy has the advantages of cheap raw materials, high...

AI Technical Summary

Problems solved by technology

[0003] At present, in the two-electrode mode of zinc-air batteries, the air electrode needs to contain a bifunctional catalyst. The catalyst must not only ensure the catalysis of oxygen evolution reaction during charging, but also meet the requirements of catalyzing the oxygen reduction reaction during discharge, which has become very difficult in technology and technology. In order to avoid this situation, the third electrode is introduced, which is specially used to charge the zinc electrode, but it also brings about the switching problem of the three electrodes when the battery is charged and discharged.

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