A device and method for removing magnetic foreign matter from lithium battery materials

Abstract

The invention discloses a device and method for removing magnetic foreign matter from lithium battery materials. The device includes a housing, a demagnetization cavity composed of magnetic plates, a plurality of cylinders installed in the demagnetization cavity, a magnetic rod inserted in each cylinder, and a magnetic bar on the top of the demagnetization cavity A liquid inlet and a liquid outlet are respectively opened at the bottom and the bottom. The method of the present invention enters from the liquid inlet of the magnetic foreign matter removal device, and when passing through the magnetic bar and the magnetic plate, the magnetic foreign matter in the liquid raw material or slurry will be sucked and will not enter the next process; if the magnetic foreign matter If the content does not meet the index requirements, it can be recycled to remove magnetic foreign matter. The invention can efficiently reduce the content of magnetic foreign matter in liquid raw materials or slurry.

Description

Technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a device and method for removing magnetic foreign bodies in lithium ion battery materials. Background technique [0002] The presence of magnetic foreign bodies brings great hidden dangers to the safety performance of lithium batteries. The product quality of lithium-ion battery materials, especially the control of magnetic foreign bodies, is the key to solving the safety problems of lithium-ion batteries. At present, lithium ion battery materials have very high requirements for magnetic foreign matter. Domestic battery manufacturers generally require about 100ppb for the content of magnetic foreign matter in lithium battery cathode materials. High-end battery manufacturers generally require 50ppb for the content of magnetic foreign matter in lithium ion battery cathode materials. Around, foreign power battery companies have higher requirements for the content of magnetic fo...

AI Technical Summary

Problems solved by technology

The existing demagnetization equipment is mainly electromagnetic demagnetization equipment. The principle is to absorb the magnetic foreign matter in the powder material or liquid by exciting the magnetic body, and then demagnetize the magnetic body to remove the magnetic foreign matter from the magnetic body. Flush on the top to discharge magnetic foreign matter, and the material of the magnetic body is mainly stainless steel. In the process of processing materials, as the properties of the material change, long-term use may cause corrosion to the material of the equipment, and it is difficult to guarantee the effect of removing magnetic foreign matter on the material. ;Secondly, the electromagnetic demagnetization equipment generates a lot of heat and consumes a lot of energy during the working process, and the selection of the type is limited due to the characteristics of some materials; finally, most powder materials use strong magnetic equipment to reduce the content of magnetic foreign matter. At present, the content of magnetic foreign matter Generally, it is best to control it at about 50ppb, and the direct yield of the product will not be very high by removing magnetic foreign matter by dry method

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