Lithium battery low-temperature pyrolysis system and pyrolysis method thereof

Abstract

The invention relates to the field of waste lithium battery recovery, and provides a lithium battery low-temperature pyrolysis system and a pyrolysis method thereof. The lithium battery low-temperature pyrolysis system comprises a pyrolysis cavity, a screw is arranged in the pyrolysis cavity, and two ends of the screw are connected with two electrodes of a power supply. The pyrolysis method comprises the following steps: processing a battery into battery fragments; putting battery fragments in the pyrolysis cavity and continuously conveying the battery fragments through a spiral, and poweringon the two ends of the spiral, so the temperature in the pyrolysis cavity is increased to 222 DEG C and 2,222 DEG C, and enabling the battery fragments to be pyrolyzed. According to the application, the heating is performed by adopting a resistance principle, so the rapid heating of the pyrolysis cavity in a short time is realized; the system has the advantages of cleanness, environmental protection and no pollution, the resistance of the battery fragments in the pyrolysis cavity is changed by adjusting the rotation frequency of the screw, and then the temperature in the pyrolysis cavity is adjusted, so the battery fragments are uniformly heated, the pyrolysis temperature can be accurately controlled, the pyrolysis effect is ensured, and the resource utilization of the battery is effectively realized.

Description

technical field [0001] The invention relates to the field of waste lithium battery recycling, in particular to a lithium battery low-temperature pyrolysis system and a pyrolysis method thereof. Background technique [0002] Lithium-ion batteries have been widely used in 3C electronic products, power vehicles, and military industries due to their advantages such as high energy density, long cycle life, wide operating temperature range, and safety and reliability. [0003] With the increasing development of the electric vehicle industry, a large number of decommissioned lithium-ion power batteries have entered the treatment and disposal link as an emerging solid waste. Waste lithium battery is used as an energy storage facility. The internal material of the battery is a mixture of metal and non-metallic substances. It is divided into battery shell, battery current collector, positive electrode material, negative electrode material, electrolyte, separator and others in structur...

AI Technical Summary

Problems solved by technology

In order to ensure full combustion of the fuel and reduce the blackness and CO content in the flue gas, the air excess coefficient is usually 1.222.2, and the combustion reaction equipment is dynamic equipment, and the sealing effect is not good, so the oxygen content and the temperature of the rotary kiln cannot be precisely controlled.

The external heating type is mainly indirect heating. The high-temperature flue gas produced by fuel and air does not contact the material. The high-temperature flue gas is usually operated under negative pressure. The negative pressure is subject to fluctuations in the incineration and flue gas purification system, resulting in changes in the amount of oxygen supplemented. The temperature is also difficult to control, which will affect the pyrolysis effect

And both of them use combustion method, which is easy to produce polluting gas

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