A rapid discharge method and discharge treatment equipment for waste lithium batteries

Abstract

The invention relates to a rapid discharge method for a waste lithium battery. The method comprises the following steps: putting the waste lithium battery into a salt solution, so as to soak the wastelithium battery; applying ultrasonic wave and magnetic field to the salt solution, so as to perform auxiliary discharge. The method ensures that the waste lithium battery realizes rapid discharged under the coaction of the ultrasonic wave and the magnetic field, and compared with the traditional mixed liquor agent discharge method, the method can reduce environment pollution and agent usage costwhile greatly quicken the discharge speed of the waste lithium battery; compared with independent ultrasonic-assisted discharge, the method can further improve the discharge speed, and shorten the period of recovery treatment of the waste lithium battery. The invention further relates to rapid discharge treatment equipment for the waste lithium battery, corresponding to the method.

Description

technical field [0001] The invention belongs to the technical field of waste battery treatment, and in particular relates to a rapid discharge method and discharge treatment equipment for waste lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of low environmental pollution, no memory effect and excellent electrochemical performance, and have been widely used in portable electronic devices, electric vehicles, power grids and other fields. The service life of rechargeable lithium-ion batteries as green energy is generally 3-8 years. With the wide application of lithium-ion batteries, waste lithium-ion batteries not only cause a large amount of solid waste pollution, but also bring serious waste of resources . It is estimated that from 2018 to 2020, there will be a wave of power battery retirement. It is expected that the retired power battery capacity from 2018 to 2020 will reach 2.7GWh, 9.1GWh, and 14.4GWh, respectively. Solving the ...

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Problems solved by technology

[0006] (1) The mixed liquid agent used in this method contains heavy metal ions, which is a highly polluted solution. The relevant enterprises must be equipped with special waste liquid treatment facilities. In addition, this method needs to rotate or stir the mixed liquid agent every predetermined time, which will cause lead to increased operating costs

[0007] (2) This method uses ultrasonic assisted discharge, but the ultrasonic wave mainly achieves the purpose of increasing the conductivity of the mixed liquid agent by increasing the number of conductive ions and the number of charges in the process of assisted discharge, but when the salt is dissolved in water to generate an electrolyte solution , the electrostatic force of ions destroys the original water structure, forming a certain layer of water molecules around the ions, that is, the ion hydration layer, which hinders the movement of ions, resulting in that the speed cannot be accelerated.

However, the acceleration of the movement speed of conductive ions by ultrasound and the destructive ability of the ion hydration layer are poor. Therefore, in this method, the effect of ultrasound on the conductivity of the mixed liquid agent is still insufficient, and the discharge speed of the used battery cannot be further increased.

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