System and method for crushing and recycling non-injected lithium battery positive plate

Abstract

The invention discloses a system and method for crushing and recycling a non-injected lithium battery positive plate. A belt conveying line is connected with a buffer storage bin through a primary crusher and a secondary crusher; the buffer storage bin is connected with an inlet of a high-temperature rotary kiln through a pressure relief bin and a bucket elevator; a powder remover is connected with one end of a linear screen, one end of the second pressure relief bin and a first negative pressure collection bin, the first negative pressure collection bin, a first airflow crushing device, a first cyclone separation bin, a first disc screen and a second negative pressure collection bin are sequentially connected, the first disc screen and the second disc screen are connected with a finished product bin through negative pressure conveying, the primary crusher, the secondary crusher, the first pressure relief bin, the second pressure relief bin, the first cyclone separation bin and the high-temperature rotary kiln are all connected with a tail gas system. A binder is removed from the material through the high-temperature rotary kiln after two primary crushing, secondary crushing and screening are not needed if the requirement for the purity of the positive electrode active material is not high, secondary crushing, screening and recycling can be carried out if the requirement for the purity of the positive electrode active material is high, the process route is simple, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of crushing and recycling systems for lithium battery positive electrodes, in particular to a crushing and recycling system and method for lithium battery positive electrodes that have not been injected with liquid. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long life, and low pollution, and are widely used in many fields such as networks, computers, electric bicycles, electric vehicles, and national defense. Especially in recent years, with the explosive growth of electric vehicles, the large-scale power lithium battery market will be accompanied by a substantial increase in the demand and scrapping of lithium batteries. [0003] The general process of lithium-ion battery manufacturing process is: active material, binder and conductive agent are mixed to prepare slurry, and then coated on both sides of copper or aluminum current collector, after drying, the solve...

AI Technical Summary

Problems solved by technology

[0014] These technologies have the following problems: (1) The process route is complex: the positive electrode active material is coated on the current collector through a binder, and it is difficult to make it fall off by physical methods, so multiple crushing and screening processes are required to increase the powder fall-off rate; However, due to the complex composition of active materials, hydrometallurgy needs to be dissolved and separated one by one by specific solvents, and even requires a third-party carrier for precipitation and separation. Compared with physical methods, it is more complicated and consumes more resources.

[0015] (2) The recovery accuracy is not high: the positive and negative electrode materials are coated on the surface of the positive and negative electrode collectors with a binder, and it is difficult to completely peel them off through conventional crushing, and multi-stage crushing will cause some of the aluminum foils of the positive electrode collector to be broken Part of the ultra-fine aluminum powder, it is difficult to separate this part of the aluminum powder in the subsequent screening, resulting in excessive aluminum powder content in the collected positive electrode active material, increasing the processing capacity of the subsequent hydrometallurgical process

[0016] (3) Production continuity problem: The linkage between the various equipment in the above process is not strong. Once one of the equipment fails, the entire production line cannot be shut down immediately. If there is too much material remaining inside the equipment, it may damage the equipment and must be cleaned up. After that, it can be turned on again, and it will take a long time for the production line to resume production.

[0017] (4) Serious environmental pollution: Dust leakage during the crushing process leads to poor site environment, high-temperature incineration of electrolytes, binders, etc. will cause various harmful substances in the tail gas to exceed the standard, polluting the environment

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