CN107024080A - A kind of vacuum drying process and drying equipment of lithium ion battery raw material - Google Patents
A kind of vacuum drying process and drying equipment of lithium ion battery raw material Download PDFInfo
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- CN107024080A CN107024080A CN201710351072.4A CN201710351072A CN107024080A CN 107024080 A CN107024080 A CN 107024080A CN 201710351072 A CN201710351072 A CN 201710351072A CN 107024080 A CN107024080 A CN 107024080A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/041—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying flowable materials, e.g. suspensions, bulk goods, in a continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
- F26B25/225—Controlling the drying process in dependence on liquid content of solid materials or objects by repeated or continuous weighing of the material or a sample thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of vacuum drying process and drying equipment of lithium ion battery raw material.The equipment includes drier, vacuum system and nitrogen heating system；It is characterized in that the drier has sampler, for being sampled in the drying process to raw material, water content test is carried out in the case where not contacted with the external world；The nitrogen heating system includes defective material Rose Box, the first nitrogen drying tower, the second nitrogen drying tower, air-introduced machine, the first pressure-reducing valve, gasifier, the second pressure-reducing valve, heater and high pressure positive blower.The technique uses new airflow circulating drying process, it compensate for conventional drawer type baking method and do not reach dynamic drying, the drawbacks of top layer is easily caused in drying process and be internal heated uneven, and in the drying process by dropping hypobaric method, the boiling point of water is reduced, the water effective in material is overflowed and accelerates evaporation, the state modulator requirement of equipment is reduced and consumes, and defective material Rose Box is provided with, the utilization rate of material is improved.
Description
Technical field
The invention belongs to battery manufacturing field, the vacuum drying process of specifically a kind of lithium ion battery raw material and drying are set
It is standby.
Background technology
Lithium ion battery has the advantages that high voltage, specific energy are big, had extended cycle life, Stability Analysis of Structures, can fast charging and discharging,
And with excellent safety and environmental protection performance, the excellent energy as electronic equipment and hybrid vehicle.And these brilliances
It is a non-aqueous electrochemical system in itself that performance, which largely comes from lithium ion battery, then the battery in cell fabrication processes
The moisture control of raw material is extremely important.Because lithium ion battery powder easily absorbs water during drying and storage, battery is caused to rouse
Swollen and battery performance is unstable, in some instances it may even be possible to bring potential safety hazard.Battery powder moisture how is effectively reduced, production is improved
Efficiency, it is cost-effective, it is an important process problem in modern lithium ion battery commercial process.
At present, the method for battery moisture drying is generally baking, and powder is contained in fixed container in certain temperature
It is lower to carry out prolonged heated baking, then using the round-robin method for vacuumizing, inflating.Application number 201010601374.0 is disclosed
The drying means of lithium ion secondary battery pole piece, separates according to following steps and positive pole coiled strip and negative pole coiled strip is dried：Will
Coiled strip is put into the pallet in drying box；Drying box is evacuated to after -0.1MPa and persistently takes out closing in 1~30 minute；Utilize heating
Device carries out 2~10 hours of heating to drying box；Inert gas is filled with drying box, reach until vacuum list index-
0.01MPa stops, allowing inert gas in drying box with exchange of moisture 5~30 minutes；Drying box is evacuated to after -0.1MPa
Persistently take out closing in 1~30 minute.The invention can thoroughly exclude the moisture in pole piece coiled strip, so as to improve battery performance and eliminate electricity
The potential safety hazard that pond bulging is brought.However, the method toasted using this drawer type, easily causes in drying process top layer and interior
Portion is heated uneven, causes material surface to overheat and influence the performance of material, does not reach dynamic drying, so that whole dry
Time lengthening.
The content of the invention
In view of the shortcomings of the prior art, the technical problem that the present invention is intended to solve is to provide a kind of lithium ion battery raw material
Vacuum drying process and drying equipment.The technique uses new airflow circulating drying process, compensate for the baking of conventional drawer type
Method, which does not reach, easily causes top layer and internal heated uneven in dynamic drying, drying process, so that whole drying time
Extension, causes the drawbacks of material surface overheats and influences the performance of material, and in the drying process by dropping hypobaric side
Method, the boiling point of reduction water is overflowed the water effective in material and accelerates evaporation, made the more thorough of powder drying, changed using less
Gas cycle-index, the state modulator requirement and consume of reduction equipment simplify whole drying process, and be provided with defective material filtering
Case, improves the utilization rate of material.
The present invention solves the problems, such as that the technical scheme of the equipment and technology is to provide a kind of drying of lithium ion battery raw material and set
It is standby, including drier, vacuum system and nitrogen heating system；It is characterized in that the drier has sampler, for dry
Raw material is sampled during dry, water content test is carried out in the case where not contacted with the external world；The nitrogen heating system includes
Defective material Rose Box, the first nitrogen drying tower, the second nitrogen drying tower, air-introduced machine, the first pressure-reducing valve, gasifier, the second pressure-reducing valve,
Heater and high pressure positive blower；The gas outlet of the drier is connected by pressure gauge and the first valve with defective material Rose Box；It is described residual
Expect that the discharging opening of Rose Box is connected by the charging aperture of pipeline and drier, the gas outlet of defective material Rose Box passes through the second valve and the
Three valves are connected with the first nitrogen drying tower；The first nitrogen drying tower is connected by the 4th valve with the second nitrogen drying tower；Institute
The second nitrogen drying tower is stated to be connected with air-introduced machine by the 5th valve；The air-introduced machine is connected with the first pressure-reducing valve；Described first subtracts
Pressure valve is connected with the passage where the 8th valve and the 9th valve respectively by the 6th valve；One end of gasifier passes through the 7th valve and the external world
Connection, the input for liquid nitrogen；The other end of gasifier by the second pressure-reducing valve respectively with it is logical where the 8th valve and the 9th valve
Road is connected；Second pressure-reducing valve is connected by the 8th valve with heater, and heater is connected with high pressure positive blower；Second decompression
Valve is connected by the 9th valve with high pressure positive blower；The high pressure positive blower is connected by the tenth valve with the air inlet of drier.
The present invention solves the problems, such as that the technical scheme of the technology is to provide a kind of vacuum of lithium ion battery raw material and done
Drying process, it is characterised in that the technique comprises the following steps：
(1) lithium ion battery powder raw material is added in drier；
(2) vacuum pumping is carried out to drier so that the vacuum in drier reaches -85KPa~-100KPa；
(3) 75 DEG C -130 DEG C of nitrogen is passed through to drier, to uniformly 20~30 points of the heating of lithium ion battery powder raw material
Clock；
(4) repeat step 2) and step 3) once more than, from the sampler in drier sample, to the original in drier
Material carries out water content test in the case where not contacted with the external world；If not being inconsistent standardization, step 2 is repeated) and step 3) one
Water content that is secondary and measuring raw material；Until the water content of raw material is reached after standard, vacuum pumping is carried out to drier so that dry
Vacuum in dry device reaches -85KPa~-100KPa；Then cold nitrogen is passed through in drier so that the temperature drop of drier
To room temperature, drying terminates.
The vacuum drying process of lithium ion battery raw material described above, it is characterised in that the technique is comprised the following steps that：
(1) lithium ion battery powder raw material is added in drier；
(2) vacuum system is worked, and nitrogen heating system is closed, and the 11st valve is opened, and vacuum pumping is carried out to drier,
Vacuum in drier reaches after -85KPa~-100KPa that vacuum system is stopped, and the 11st valve is closed；
(3) nitrogen heating system works, the first valve of nitrogen heating system, the second valve, the 3rd valve, the 4th valve, the 5th valve,
6th valve, the 7th valve, the 8th valve and the tenth valve are opened, and the 9th valve is closed；Liquid nitrogen sequentially passes through the 7th valve, gasifier, second subtracted
After pressure valve, the 8th valve and heater, as the hot nitrogen that temperature is 75 DEG C -130 DEG C；Hot nitrogen is after high pressure positive blower and the tenth valve
Into in drier, heating uniform to raw material 20~30 minutes；Temperature drop and nitrogen containing impurity are from drier after work
Outflow, sequentially passes through the first valve, defective material Rose Box, the second valve, the 3rd valve, the first nitrogen drying tower, the 4th valve, the second nitrogen and does
After dry tower, the 5th valve, air-introduced machine, the first pressure-reducing valve, the 6th valve and the 8th valve, heater heating is come back to；After heating terminates
The first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th valve, the 8th valve and the tenth valve are closed successively；
In hot nitrogen drying process, part powder flows out drier with hot nitrogen, is filtered after the first valve by defective material
Case returns to drier, continues drying；
(4) repeat step 2) and step 3) once more than, from the sampler in drier sample, to the original in drier
Material carries out water content test in the case where not contacted with the external world；If not being inconsistent standardization, step 2 is repeated) and step 3) one
Water content that is secondary and measuring raw material；Until the water content of raw material is reached after standard, and vacuum system work, the 11st valve is opened, right
The vacuum that drier is carried out in vacuum pumping, drier reaches after -85KPa~-100KPa that vacuum system is stopped,
11st valve is closed；Nitrogen heating system works, the first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th valve, the 7th
Valve, the 9th valve and the tenth valve are opened, and the 8th valve is closed, and cold nitrogen is passed through in drier, the temperature of device to be dried is down to room temperature
Afterwards, nitrogen supply (NS) system is closed, drying terminates.
Compared with prior art, beneficial effect of the present invention is：
(1) new airflow circulating drying process is used, conventional drawer type baking method is compensate for and does not reach dynamic drying,
Top layer is easily caused in drying process and internal heated uneven, so that whole drying time extension, causes material surface mistake
Heat and the drawbacks of influence the performance of material, and in the drying process by dropping hypobaric method, make that powder dries is more thorough
Bottom, using less ventilation cycle number of times, the state modulator requirement and consume of reduction equipment simplify whole drying process, and set
Defective material Rose Box has been put, the utilization rate of material is improved.
(2) when the air pressure in drier drops to below -85KPa, the boiling point reduction of water, so as at 75 DEG C -130 DEG C
At a temperature of make moisture evaporation completely, reach preferable water removal effect, be also possible to prevent raw material because temperature is too high and fails.High is true
Reciprocal of duty cycle is also beneficial to the moisture discharge in raw material, accelerates rate of drying.
(3) hot nitrogen is passed through in the drying process, can not only be dried by heat radiation mode, raw material can also be allowed to pass through
Thermal convection current, the heat exchange pattern heating of gas, make moisture therein quickly spread, reduce the time required for heating, powder
Equably dried, in case heating is uneven or local excessive is heated.
(4) realize and recycle in terms of hot nitrogen, the hot nitrogen initially produced enters from drier air inlet, realize
Circulation is taken out of after steam from gas outlet, then realizes by defective material Rose Box, nitrogen drying tower and pressure-reducing valve the recovery of nitrogen, then with
The nitrogen being continually fed into enters drier after heating and pressurization, realizes the circulation of nitrogen.
(5) defective material Rose Box is added during nitrogen circulation is utilized, made while filter nitrogen with nitrogen
The raw material of outflow departs from circulating nitrogen gas, be again introduced into drier and be dried, improve the utilization rate of raw material, it is to avoid material
Waste.
(6) low temperature drying nitrogen is passed through after dry terminate accelerates temperature reducing rate in drier, substantially reduces
The production cycle of battery powder, energy expenditure is saved, and by quickly cooling down, it is to avoid high temperature feedstock is in ensuing life
It is oxidized during production.
(7) 5~10h of the overall process used time is dried, dry speed and efficiency is improved, substantially reduces arid cycle.And
And the moisture of raw material is significantly reduced, dried feed moisture content is less than 200ppm, improve the quality of battery powder.
Brief description of the drawings
Fig. 1 is a kind of drying equipment of embodiment of vacuum drying process and drying equipment of lithium ion battery raw material of the present invention
Overall structure diagram；
Embodiment
The specific embodiment of the present invention is given below.Specific embodiment is only used for that the present invention is further described, and does not limit
The application scope of the claims processed.
The invention provides a kind of drying equipment of lithium ion battery raw material (referring to Fig. 1, abbreviation equipment), including drier
1st, vacuum system and nitrogen heating system；The drier 1 can realize that vacuum is more than 100%, and heat resisting temperature is higher than 130 DEG C；
The vacuum system includes turbomolecular pump 2 and screw pump 3；The turbomolecular pump 2 is under the drive of motor by drier
Gas compression, it is driven onto exhaust outlet, prime air taken away；The screw pump 3 discharges air under the drive of motor,
The vacuum specified is realized in monitoring for each instrument；It is characterized in that the drier 1 has sampler 13, in drying
During to raw material sample, not with the external world contact in the case of progress water content test；The nitrogen heating system includes residual
Material Rose Box 4, the first nitrogen drying tower 5, the second nitrogen drying tower 6, air-introduced machine 7, the first pressure-reducing valve 8, gasifier 9, second subtract
Pressure valve 10, heater 11 and high pressure positive blower 12；The gas outlet of the drier 1 passes through pressure gauge and the first valve and defective material Rose Box
4 connections；The discharging opening of the defective material Rose Box 4 is connected by pipeline with the charging aperture of drier 1, the outlet of defective material Rose Box 4
Mouth is connected by the second valve and the 3rd valve with the first nitrogen drying tower 5；The first nitrogen drying tower 5 passes through the 4th valve and second
Nitrogen drying tower 6 is connected；The second nitrogen drying tower 6 is connected by the 5th valve with air-introduced machine 7；The air-introduced machine 7 and first
Pressure-reducing valve 8 is connected；First pressure-reducing valve 8 is connected with the passage where the 8th valve and the 9th valve respectively by the 6th valve；Gasification
One end of device 9 is in communication with the outside by the 7th valve, the input for liquid nitrogen；The other end of gasifier 9 passes through the second pressure-reducing valve 10
Connected respectively with the passage where the 8th valve and the 9th valve；Second pressure-reducing valve 10 is connected by the 8th valve with heater 11,
Heater 11 is connected with high pressure positive blower 12；Second pressure-reducing valve 10 is connected by the 9th valve with high pressure positive blower 12；The high pressure
Blower fan 12 is connected by the tenth valve with the air inlet of drier 1.
Invention also provides a kind of vacuum drying process of lithium ion battery raw material (abbreviation technique), it is characterised in that
The technique is comprised the following steps that：
(1) lithium ion battery powder raw material is added in drier 1；
(2) vacuum system is worked, and nitrogen heating system is closed, and the 11st valve is opened, and drier 1 is carried out to vacuumize behaviour
Make, the vacuum in drier reaches after -85KPa~-100KPa that vacuum system is stopped, the 11st valve is closed；-85KPa
~-100KPa vacuum can not only reduce the boiling point of water, it is accelerated evaporation, and the water effective in raw material can also be made to overflow
Go out, accelerate drying process；
(3) nitrogen heating system works, the first valve of nitrogen heating system, the second valve, the 3rd valve, the 4th valve, the 5th valve,
6th valve, the 7th valve, the 8th valve and the tenth valve are opened, and the 9th valve is closed；Liquid nitrogen sequentially passes through the 7th valve, gasifier 9, second subtracted
After pressure valve 10, the 8th valve and heater 11, as pure hot nitrogen is dried, hot nitrogen temperature is 75 DEG C -130 DEG C；Hot nitrogen
Enter after the valve of high pressure positive blower 12 and the tenth in drier 1, heating uniform to raw material 20~30 minutes；After work temperature drop and
Nitrogen containing impurity flows out from drier 1, sequentially passes through the first valve, defective material Rose Box 4, the second valve, the 3rd valve, the first nitrogen
After drying tower 5, the 4th valve, the second nitrogen drying tower 6, the 5th valve, air-introduced machine 7, the first pressure-reducing valve 8, the 6th valve and the 8th valve, weight
Newly heater 11 is returned to heat；Heating closes the first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th successively after terminating
Valve, the 8th valve and the tenth valve；
In hot nitrogen drying process, have part powder and flow out drier with hot nitrogen, defective material is passed through after the first valve
Rose Box 4 returns to drier 1, continues drying；
By importing high temperature drying nitrogen raw material can be made to be rapidly heated under conditions of thermally conductive heat convection current, and make to add
Heat and drying are more uniformly distributed；And in whole drying process, the heating-up temperature to raw material can not be too high.Due to the peace of defective material Rose Box
Dress, the utilization nitrogen that can not only be circulated, and improve the utilization rate of raw material, it is to avoid the waste of material；
(4) repeat step 2) and step 3) once more than, depending on number of times is according to actual drying material, out of drier 1
Sampled in sampler 13, water content test is carried out in the case where not contacted with the external world to the raw material in drier 1；If not meeting
Standard, then repeat step 2) and step 3) once and measure the water content of raw material；Until the water content of raw material is reached after standard,
Vacuum system is worked, and the 11st valve is opened, and carrying out the vacuum in vacuum pumping, drier to drier 1 reaches -85KPa
After~-100KPa, vacuum system is stopped, and the 11st valve is closed；Nitrogen heating system works, the first valve, the second valve, the 3rd
Valve, the 4th valve, the 5th valve, the 6th valve, the 7th valve, the 9th valve and the tenth valve are opened, and the 8th valve is closed, and cold nitrogen is passed through into drying
In device, the temperature of device to be dried is down to after room temperature, closes nitrogen supply (NS) system, and drying terminates.The process for being passed through cold nitrogen accelerates
The cooling procedure of raw material, and drying is more uniformly distributed, total time-consuming is shortened.
Embodiment 1
A kind of vacuum drying process of lithium ion battery raw material, it is characterised in that the technique comprises the following steps：
(1) lithium ion battery powder raw material is added in drier 1；
(2) vacuum system is worked, and nitrogen heating system is closed, and the 11st valve is opened, and drier 1 is carried out to vacuumize behaviour
Make, the vacuum in drier reaches after -99KPa that vacuum system is stopped, the 11st valve is closed；
(3) nitrogen heating system works, the first valve of nitrogen heating system, the second valve, the 3rd valve, the 4th valve, the 5th valve,
6th valve, the 7th valve, the 8th valve and the tenth valve are opened, and the 9th valve is closed；Liquid nitrogen sequentially passes through the 7th valve, gasifier 9, second subtracted
After pressure valve 10, the 8th valve and heater 11, as pure hot nitrogen is dried, hot nitrogen temperature is 100 DEG C；Hot nitrogen is through high pressure
Enter after the valve of blower fan 12 and the tenth in drier 1, heating uniform to raw material 30 minutes；Temperature drop and contain impurity after work
Nitrogen flows out from drier 1, sequentially passes through the first valve, defective material Rose Box 4, the second valve, the 3rd valve, the first nitrogen drying tower 5,
After four valves, the second nitrogen drying tower 6, the 5th valve, air-introduced machine 7, the first pressure-reducing valve 8, the 6th valve and the 8th valve, heating is come back to
Device 11 is heated；Heating terminate after close successively the first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th valve, the 8th valve and
Tenth valve；
(4) repeat step 2) and step 3) more than five times, sampled from the sampler 13 in drier 1, in drier 1
Raw material not with the external world contact in the case of progress water content test；It is not inconsistent standardization, repeats step 2) and step 3) one
Water content that is secondary and measuring raw material；Repeat step 2) and step 3) twice after, the water content of raw material reaches standard, vacuum system
Work, the 11st valve is opened, and carrying out the vacuum in vacuum pumping, drier to drier 1 reaches after -99KPa, vacuum system
System is stopped, and the 11st valve is closed；Nitrogen heating system work, the first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve,
6th valve, the 7th valve, the 9th valve and the tenth valve are opened, and the 8th valve is closed, and cold nitrogen is passed through in drier, the temperature of device to be dried
Degree is down to after room temperature, closes nitrogen supply (NS) system, and drying terminates.Flow drying time is 6 hours, the water content test knot of raw material
Fruit is in 145ppm.
The present invention does not address part and is applied to prior art.
Claims (3)
1. a kind of drying equipment of lithium ion battery raw material, including drier, vacuum system and nitrogen heating system；Its feature exists
There is sampler in the drier, for being sampled in the drying process to raw material, carried out in the case where not contacted with the external world
Water content is tested；The nitrogen heating system includes defective material Rose Box, the first nitrogen drying tower, the second nitrogen drying tower, air inducing
Machine, the first pressure-reducing valve, gasifier, the second pressure-reducing valve, heater and high pressure positive blower；The gas outlet of the drier passes through pressure gauge
It is connected with the first valve with defective material Rose Box；The discharging opening of the defective material Rose Box is connected by the charging aperture of pipeline and drier,
The gas outlet of defective material Rose Box is connected by the second valve and the 3rd valve with the first nitrogen drying tower；The first nitrogen drying tower leads to
The 4th valve is crossed to be connected with the second nitrogen drying tower；The second nitrogen drying tower is connected by the 5th valve with air-introduced machine；It is described to draw
Blower fan is connected with the first pressure-reducing valve；First pressure-reducing valve is connected with the passage where the 8th valve and the 9th valve respectively by the 6th valve
It is logical；One end of gasifier is in communication with the outside by the 7th valve, the input for liquid nitrogen；The other end of gasifier passes through the second decompression
Valve is connected with the passage where the 8th valve and the 9th valve respectively；Second pressure-reducing valve is connected by the 8th valve with heater, plus
Hot device is connected with high pressure positive blower；Second pressure-reducing valve is connected by the 9th valve with high pressure positive blower；The high pressure positive blower passes through
Ten valves are connected with the air inlet of drier.
2. a kind of vacuum drying process of lithium ion battery raw material, it is characterised in that the technique comprises the following steps：
(1) lithium ion battery powder raw material is added in drier；
(2) vacuum pumping is carried out to drier so that the vacuum in drier reaches -85KPa~-100KPa；
(3) 75 DEG C -130 DEG C of nitrogen is passed through to drier, lithium ion battery powder raw material is uniformly heated 20~30 minutes；
(4) repeat step 2) and step 3) once more than, from the sampler in drier sample, the raw material in drier is existed
Water content test is carried out in the case of not contacted with the external world；If not being inconsistent standardization, step 2 is repeated) and step 3) once simultaneously
Measure the water content of raw material；Until the water content of raw material is reached after standard, vacuum pumping is carried out to drier so that drier
Interior vacuum reaches -85KPa~-100KPa；Then cold nitrogen is passed through in drier so that the temperature of drier is down to room
Wen Hou, drying terminates.
3. the vacuum drying process of lithium ion battery raw material according to claim 2, it is characterised in that the technique is specifically walked
It is rapid as follows：
(1) lithium ion battery powder raw material is added in drier；
(2) vacuum system is worked, and nitrogen heating system is closed, and the 11st valve is opened, and vacuum pumping is carried out to drier, is dried
Vacuum in device reaches after -85KPa~-100KPa that vacuum system is stopped, and the 11st valve is closed；
(3) nitrogen heating system works, the first valve of nitrogen heating system, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th
Valve, the 7th valve, the 8th valve and the tenth valve are opened, and the 9th valve is closed；Liquid nitrogen sequentially pass through the 7th valve, gasifier, the second pressure-reducing valve,
After 8th valve and heater, as the hot nitrogen that temperature is 75 DEG C -130 DEG C；Hot nitrogen enters after high pressure positive blower and the tenth valve
In drier, heating uniform to raw material 20~30 minutes；Temperature drop and nitrogen containing impurity flows out from drier after work,
Sequentially pass through the first valve, defective material Rose Box, the second valve, the 3rd valve, the first nitrogen drying tower, the 4th valve, the second nitrogen drying tower,
After 5th valve, air-introduced machine, the first pressure-reducing valve, the 6th valve and the 8th valve, heater heating is come back to；Heating is closed successively after terminating
Close the first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th valve, the 8th valve and the tenth valve；
In hot nitrogen drying process, part powder flows out drier with hot nitrogen, is returned after the first valve by defective material Rose Box
To drier, continue drying；
(4) repeat step 2) and step 3) once more than, from the sampler in drier sample, the raw material in drier is existed
Water content test is carried out in the case of not contacted with the external world；If not being inconsistent standardization, step 2 is repeated) and step 3) once simultaneously
Measure the water content of raw material；Until the water content of raw material is reached after standard, and vacuum system work, the 11st valve is opened, to drying
The vacuum that device is carried out in vacuum pumping, drier reaches after -85KPa~-100KPa that vacuum system is stopped, the tenth
One valve is closed；Nitrogen heating system works, the first valve, the second valve, the 3rd valve, the 4th valve, the 5th valve, the 6th valve, the 7th valve, the
Nine valves and the tenth valve are opened, and the 8th valve is closed, and cold nitrogen is passed through in drier, the temperature of device to be dried is down to after room temperature, are closed
Nitrogen supply (NS) system is closed, drying terminates.
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| CN112747565A (en) * | 2021-01-26 | 2021-05-04 | 昆山聚创新能源科技有限公司 | Vacuum baking method of electrode roll |
| CN114583417A (en) * | 2022-04-28 | 2022-06-03 | 深圳市鸿华自动化科技有限公司 | Lithium battery liquid injection machine for new energy automobile and control system |
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Application publication date: 20170808 |