Dry process discharge technology of waste lithium ion batteries

Abstract

The invention discloses a dry process discharge technology of waste lithium ion batteries. The dry process discharge technology comprises the following steps: (1) uniformly adding the waste lithium ion batteries with remaining electricity and a discharge medium into a stirring device in the volume ratio of 1: 4 through a vibration feeder respectively, and simultaneously injecting liquid nitrogen accounting for 2.5% to 3.5% of the volume of the cavity, wherein the volume of the lithium ion batteries and the discharge medium accounts for 85% to 90% of the cavity of the stirring device; (2) under the conditions of liquid nitrogen cooling and inert gas protection, firstly rotating the stirring device for 10 minutes at the rotating speed of 30 rpm so that materials inside the cavity are uniformly mixed; then rotating at a low speed of 2 rpm and stirring, and continuously discharging for 6 to 12 hours; (3) after the discharging is completed, discharging the stirring device, sieving through a sieve with the mesh size of 50 meshes, recycling the waste lithium ion batteries without remaining electricity above the sieve, and recycling a discharge medium under the sieve; and (4) enabling the waste lithium ion batteries without remaining electricity to enter into subsequent treatment disposal working procedures, enabling the recycled discharge medium to return to a medium storage device, and carrying out subsequent discharge preparation.

Description

technical field [0001] The invention relates to the technology in the field of recycling waste batteries, in particular to a dry discharge process for waste lithium-ion batteries. Background technique [0002] The existing technology is to use sodium chloride aqueous solution to short-circuit discharge the waste lithium-ion battery. During the discharge process, the battery will undergo electrochemical corrosion, and the anode material will enter the discharge solution in the form of ions, forming a large amount of anode slime. Cause environmental pollution; on the other hand, the electrolysis of the aqueous solution during the discharge process releases a large amount of hydrogen and oxygen, which has a potential explosion risk. After the waste lithium-ion battery is discharged, it needs to increase the dehydration or drying process, which has high energy consumption, complicated process and low efficiency. Contents of the invention [0003] In view of this, the present ...

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Problems solved by technology

[0002] The existing technology is to use sodium chloride aqueous solution to short-circuit discharge the waste lithium-ion battery. During the discharge process, the battery will undergo electrochemical corrosion, and the anode material will enter the discharge solution in the form of ions, forming a large amount of anode slime. Cause environmental pollution; on the other hand, during the discharge process, the aqueous solution is electrolyzed, releasing a large amount of hydrogen and oxygen, which has a potential explosion risk

After the waste lithium-ion battery is discharged, it needs to increase the dehydration or drying process, which has high energy consumption, complicated process and low efficiency.

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