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A method for removing diaphragms in waste lithium-ion power batteries

A power battery and lithium-ion technology, which is applied in the field of waste lithium-ion power battery recycling and processing, can solve problems such as poor effect and residual electrode materials, achieve good cooling effect, complete decomposition, and solve removal problems

Active Publication Date: 2020-10-27
ZHUZHOU DINGDUAN EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After the power battery is broken, the polyolefin microporous diaphragm is dispersed in the scrap, and the particles of the electrode material after crushing are easy to adhere to the inside of the microporous diaphragm. The effect of ordinary separation methods is not very good, and there are still a large number of particles in the microporous diaphragm. Residues of Electrode Material

Method used

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  • A method for removing diaphragms in waste lithium-ion power batteries

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Effect test

Embodiment 1

[0035] A method for removing polyolefin microporous diaphragms in waste lithium-ion power batteries of the present invention, such as figure 1 shown, including the following steps:

[0036] (1) Crushing waste lithium-ion power batteries into fragments with a diameter of no more than 15 mm and passing through a 5-mesh sieve to obtain small-grained fragments with a particle diameter of less than 5 mesh and large-grained fragments with a particle diameter greater than 5 mesh;

[0037] (2) The large-size crushed material obtained after the step (1) is transported to the rotary kiln reaction furnace of the removing device of the diaphragm by a conveyor belt for preheating, the temperature of the preheating is controlled at 150 ° C, and the preheating time is 1.0h;

[0038] (3) Continue to heat and decompose the scrap obtained after the preheating in step (2) is completed in the rotary kiln reaction furnace until the diaphragm in the scrap is completely thermally decomposed, and th...

Embodiment 2

[0043] A method for removing polyolefin microporous diaphragms in waste lithium-ion power batteries of the present invention, comprising the steps of:

[0044] (1) Crushing waste lithium-ion power batteries into fragments with a diameter of no more than 15 mm and passing through a 5-mesh sieve to obtain small-grained fragments with a particle diameter of less than 5 mesh and large-grained fragments with a particle diameter greater than 5 mesh;

[0045] (2) The large-size crushed material obtained after the step (1) is transported to the rotary kiln reaction furnace of the diaphragm removal device by a conveyor belt for preheating. The preheating temperature is controlled at 100 ° C. The preheating time is 2.0h;

[0046] (3) Continue to heat and decompose the scrap obtained after the preheating in step (2) in the rotary kiln reactor until the diaphragm in the scrap is completely thermally decomposed, and the temperature of thermal decomposition is controlled at 300°C. The time...

Embodiment 3

[0051] A method for removing polyolefin microporous diaphragms in waste lithium-ion power batteries of the present invention, comprising the steps of:

[0052] (1) Crushing waste lithium-ion power batteries into fragments with a diameter of no more than 15 mm and passing through a 5-mesh sieve to obtain small-grained fragments with a particle diameter of less than 5 mesh and large-grained fragments with a particle diameter greater than 5 mesh;

[0053] (2) The large-size crushed material obtained after the step (1) is transported to the rotary kiln reaction furnace of the diaphragm removal device by a conveyor belt for preheating. The preheating temperature is controlled at 300 ° C. The preheating time is 0.5h;

[0054] (3) Continue to heat and decompose the scrap obtained after the preheating in step (2) is completed in the rotary kiln reaction furnace until the diaphragm in the scrap is completely thermally decomposed, and the temperature of thermal decomposition is controll...

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Abstract

The invention discloses a method for removing a separator in a waste lithium ion power battery, which comprises the following steps: crushing the waste lithium ion power battery into crumbs and passing through a 5-mesh screen to obtain small crumbs with a particle size less than 5 mesh and large crumbs with a particle size greater than 5 mesh; Preheating the large particle size crushed material, and controlling the preheating temperature at 100-300 DEG C; Heating and decomposing the crumbs obtained after the preheating is completed until the thermal decomposition of the diaphragm in the crumbsis complete and the temperature of the thermal decomposition is controlled at 300 to 500 DEG C; cooling and recovering The scrap obtained after decomposition. The method adopts two-stage heating design, improves the pyrolysis efficiency of the separator in the scrap material, the pyrolysis of the separator is more complete, the separator in the waste lithium ion power battery can be directly decomposed and removed, and the problem of removing the separator in the scrap material after the scrap material of the waste power battery is broken is solved; At that same time, the process method is simple to operate and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of recycling and processing waste lithium-ion power batteries, and in particular relates to a method for removing diaphragms in waste lithium-ion power batteries. Background technique [0002] Lithium-ion power battery is a new type of high-energy battery successfully developed in the 20th century. The negative electrode of this battery is metallic lithium, and the positive electrode uses MnO 2 , SOCl 2 , (CFx) n etc., because of its advantages of high energy, high battery voltage, wide operating temperature range, and long storage life, it has been widely used in military and civilian small electrical appliances. The diaphragm material is assembled between the positive and negative electrodes of the battery after absorbing the electrolyte, which is a very important part of the lithium-ion power battery. The main function of the separator is to separate the positive and negative electrodes of the battery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 薛辛马成朱龙冠殷康健
Owner ZHUZHOU DINGDUAN EQUIP CO LTD
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