CN111326813A - Battery electrolyte recovery device and electrolyte recovery method thereof - Google Patents

Abstract

The invention relates to a battery electrolyte recovery device and a recovery method of electrolyte thereof, and particularly discloses a waste lithium ion battery electrolyte recovery device, which comprises a closed cover, an electrolyte liquid collector, an exhaust fan, a vent pipe, a solvent tank, an evaporation tank and a condenser, wherein a material transition cabin is arranged in the closed cover; one end of the exhaust fan is connected with the closed cover through a vent pipe, and the other end of the exhaust fan is connected with the solvent tank through a pipeline; the solvent tank is connected with the evaporating tank through a delivery pump, the evaporating tank is connected with a first condenser and a second condenser, the first condenser is connected with the solvent tank, the second condenser is connected with the recovery tank, a first valve is arranged above the first condenser, and a second valve is arranged above the second condenser; and a mechanical battery disassembling device is arranged in the sealing cover. The device has simple structure, high recovery efficiency and less pollution.

Description

A kind of battery electrolyte recovery device and recovery method of electrolyte

technical field

The invention belongs to the field of waste battery regeneration, and specifically designs a battery electrolyte recovery device.

Background technique

Lithium-ion power batteries have the advantages of high specific energy, large capacity, high operating voltage, and long cycle life, and are the main power source for electric vehicles. With the requirements of environmental protection and the introduction of national policies, the electric vehicle industry is already at the peak of its development. Since the life of lithium-ion power batteries is only three to five years, there will be a large number of waste lithium-ion power batteries waiting to be recycled. The electrolyte of lithium ion battery is mainly composed of organic solvent and lithium salt. The organic solvent includes propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, etc. The lithium salt includes lithium hexafluorophosphate and lithium chlorate. , lithium bis-trifluoromethanesulfonimide, etc., these substances are more or less harmful to the human body, especially lithium hexafluorophosphate will release corrosive and highly toxic hydrogen fluoride when exposed to water, so in the battery recycling process Special attention should be paid to the control of electrolyte leakage and volatilization to prevent environmental pollution during the recycling process.

At present, there are few studies on the recovery and collection process of lithium-ion battery electrolyte in China. The main method is to open or break the battery by physical means, and then use centrifugal (CN201310290286), vacuum (CN201110427431, CN201310374644), liquid nitrogen freezing (CN201410069599) and other means To recover the electrolyte, in fact, the electrolyte has leaked in the physical opening stage of the battery and the transfer process. In order to overcome the shortcomings of the existing equipment, the present invention integrates the electrolyte recovery system into the disassembly, drying and pulverization of the battery. process to prevent the leakage of electrolyte waste liquid and exhaust gas during the battery disassembly process, so as to maximize the recovery of electrolyte and achieve safety and environmental protection.

SUMMARY OF THE INVENTION

The invention provides a waste lithium-ion power battery electrolyte recovery device, which adopts an environmentally friendly and harmless method for the recovery process of the lithium-ion power battery to realize the recycling and utilization of the waste lithium-ion power battery electrolyte, and avoids the electrolyte to the environment. hazard.

The present invention provides a waste lithium-ion battery electrolyte recovery device, comprising a closed cover 1, an electrolyte liquid collector 2, an exhaust fan 3, a ventilation pipe 4, a solvent tank 5, an evaporation tank 6 and condensers 7 and 8,

The airtight cover 1 is provided with a material transition cabin 9, and the electrolyte liquid collector 2 is disposed inside the airtight cover, and is connected to the solvent tank 5 through a transfer pump 10;

One end of the exhaust fan 3 is connected with the airtight cover 1 through the ventilation pipe 4, and the other end is connected with the solvent tank 5 through the pipeline 11;

The solvent tank 5 is connected with the evaporation tank 6 through the delivery pump 12, the evaporation tank 6 is connected with the first condenser 7 and the second condenser 8, the first condenser 7 is connected with the solvent tank 5, and the first condenser 7 is connected with the solvent tank 5. The second condenser 8 is connected to the recovery tank 13, a first valve 14 is arranged above the first condenser 7, and a second valve 15 is arranged above the second condenser 8;

A battery mechanical disassembly device is provided in the sealing cover.

In the technical solution of the present invention, the material transition cabin has two doors that can be opened and closed independently, the first door is connected to the outside world, and the second door is connected to the sealing cover.

In the technical solution of the present invention, the airtight cover 1, the electrolyte liquid collector 2, the exhaust fan 3, the ventilation pipe 4, the solvent tank 5, the evaporation tank 6 and the connection between the first condenser 7 and the second condenser 8 All are sealed connections.

In the technical solution of the present invention, the battery mechanical disassembly device is a fixing robot arm and a battery dividing device.

In the technical solution of the present invention, the battery dividing device is a cutting machine.

Another aspect of the present invention provides a method for recycling waste lithium ion battery electrolyte, which uses the waste lithium ion battery electrolyte recycling device of the present invention for recycling.

When using the present invention, the battery is put into the airtight cover 1 through the material transition chamber 9 to be fixed by the fixing arm, and disassembled by the battery dividing device, and the electrolyte liquid collector 2 is used to collect the liquid electrolyte obtained during the disassembly process. The liquid is transported to the solvent tank 5 through the delivery pump 10, and the exhaust fan 3 is turned on to collect the air containing the electrolyte in the airtight cover 1 through the ventilation pipe 4, and is transported to the solvent tank 5 through the pipeline 11. The organic solvent in the solvent tank 5 is fully contacted and dissolved, and the delivery pump 12 transports the solvent to the evaporation tank 6 for evaporation. Because the boiling points of the electrolyte and the organic solvent are different, the gases with different boiling points are used to condense to achieve the purpose of separation. When the temperature reached the boiling point of the organic solvent, the first valve 14 was opened, and the organic solvent vapor was transported to the first condenser 7 for condensation, and the condensed organic liquid was transported to the solvent tank 5 for recycling; when the temperature reached the boiling point of the electrolyte , close the first valve 14, open the second valve 15, transport the electrolyte vapor to the second condenser 8 for recovery, and finally transport the condensed electrolyte to the recovery tank 13.

beneficial effect

The invention is simple in structure, practical and convenient, can fully recover the electrolyte in the battery recycling process, and avoids serious environmental pollution caused by electrolyte leakage.

The organic solvent used in the present invention can be effectively separated from the battery electrolyte and recycled through a recycling device, thereby improving the utilization efficiency and reducing pollution.

Description of drawings

Fig. 1 is the structural representation of the present invention, wherein 1-airtight cover, 2-liquid electrolyte collector, 3-exhaust fan, 4-vent pipe, 5-solvent tank, 6-evaporating tank, 7-first condenser, 8-Second condenser, 9-Material transition cabin, 10-Transport pump, 11-Pipeline, 12-Transport pump, 13-Recovery tank, 14-First valve, 15-Second valve.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

The specific structure of the waste battery electrolyte recovery device provided in this embodiment is shown in FIG. 1 .

A waste lithium-ion power battery electrolyte recovery device, comprising a closed cover 1, an electrolyte liquid collector 2, an exhaust fan 3, a ventilation pipe 4, a solvent tank 5, an evaporation tank 6 and condensers 7 and 8,

The airtight cover 1 is provided with a material transition cabin 9, and the electrolyte liquid collector 2 is disposed inside the airtight cover, and is connected to the solvent tank 5 through a transfer pump 10;

One end of the exhaust fan 3 is connected with the airtight cover 1 through the ventilation pipe 4, and the other end is connected with the solvent tank 5 through the pipeline 11;

The solvent tank 5 is connected with the evaporation tank 6 through the delivery pump 12, the evaporation tank 6 is connected with the first condenser 7 and the second condenser 8, the first condenser 7 is connected with the solvent tank 5, and the first condenser 7 is connected with the solvent tank 5. The second condenser 8 is connected to the recovery tank 13, a first valve 14 is arranged above the first condenser 7, and a second valve 15 is arranged above the second condenser 8;

A battery mechanical disassembly device is provided in the sealing cover.

In a preferred embodiment, the material transition cabin has two doors that can be opened and closed independently, the first door is connected to the outside world, and the second door is connected to the sealing cover.

In a preferred embodiment, the airtight cover 1, the electrolyte liquid collector 2, the exhaust fan 3, the ventilation pipe 4, the solvent tank 5, the evaporation tank 6 and the connection between the first condenser 7 and the second condenser 8 All are sealed connections.

In a preferred embodiment, the battery mechanical disassembly device is a fixed robot arm and a battery dividing device.

In a more preferred embodiment, the battery dividing device is a cutting machine.

When using the present invention, the battery is put into the airtight cover 1 through the material transition chamber 9 to be fixed by the fixing arm, and disassembled by the battery dividing device, and the electrolyte liquid collector 2 is used to collect the liquid electrolyte obtained during the disassembly process. The liquid is transported to the solvent tank 5 through the delivery pump 10, the exhaust fan 3 is turned on, and the air containing the electrolyte in the airtight cover 1 is collected through the ventilation pipe 4, and is transported to the solvent tank 5 through the pipeline 11. The organic solvent in the solvent tank 5 is fully contacted and dissolved, and the delivery pump 12 transports the solvent to the evaporation tank 6 for evaporation. Because the boiling points of the electrolyte and the organic solvent are different, the gases with different boiling points are used to condense to achieve the purpose of separation. When the temperature reached the boiling point of the organic solvent, the first valve 14 was opened, and the organic solvent vapor was transported to the first condenser 7 for condensation, and the condensed organic liquid was transported to the solvent tank 5 for recycling; when the temperature reached the boiling point of the electrolyte , close the first valve 14, open the second valve 15, transport the electrolyte vapor to the second condenser 8 for recovery, and finally transport the condensed electrolyte to the recovery tank 13.

Those skilled in the art can easily understand that, on the premise of no conflict, the above preferred solutions can be freely combined and superimposed.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. A waste lithium-ion power battery electrolyte recovery device, comprising a closed cover (1), an electrolyte liquid collector (2), an exhaust fan (3), a ventilation pipe (4), a solvent tank (5), and an evaporation tank (6) and condensers (7) and (8), A material transition cabin (9) is arranged in the airtight cover (1), and the electrolyte liquid collector (2) is arranged inside the airtight cover and is connected to the solvent tank (5) through a delivery pump (10); One end of the exhaust fan (3) is connected with the airtight cover (1) through the ventilation pipe (4), and the other end is connected with the solvent tank (5) through the pipe (11); The solvent tank (5) is connected with the evaporation tank (6) through the delivery pump (12), and the evaporation tank (6) is connected with the first condenser (7) and the second condenser (8), the first condenser (7) and the second condenser (8). The condenser (7) is connected with the solvent tank (5), the second condenser (8) is connected with the recovery tank (13), the first valve (14) is arranged above the first condenser (7), and the first A second valve (15) is arranged above the second condenser (8); A battery mechanical disassembly device is provided in the sealing cover. 2. The waste lithium-ion power battery electrolyte recovery device according to claim 1, wherein the material transition cabin has two doors that can be opened and closed independently, the first door is connected to the outside world, and the second door is connected to the sealing cover. 3. The waste lithium-ion power battery electrolyte recovery device according to claim 1 or 2, wherein the airtight cover (1), the electrolyte liquid collector (2), the exhaust fan (3), the ventilation pipe (4), The connections between the solvent tank (5), the evaporation tank (6) and the first condenser (7) and the second condenser (8) are all sealed connections. 4 . The electrolyte recovery device for waste lithium-ion power batteries according to claim 1 , wherein the battery mechanical disassembly device is a fixed robotic arm and a battery dividing device. 5 . 5. The waste lithium-ion power battery electrolyte recovery device according to claim 4, wherein the battery dividing device is a cutting machine. 6. A method for recycling waste and old lithium ion battery electrolyte, which adopts the waste and old lithium ion battery electrolyte recycling device according to any one of claims 1 to 5 for recycling.

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