CN106855343A - A kind of lithium ion battery rapid draing cool-down method - Google Patents
A kind of lithium ion battery rapid draing cool-down method Download PDFInfo
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- CN106855343A CN106855343A CN201611183892.9A CN201611183892A CN106855343A CN 106855343 A CN106855343 A CN 106855343A CN 201611183892 A CN201611183892 A CN 201611183892A CN 106855343 A CN106855343 A CN 106855343A
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- inert gas
- lithium ion
- ion battery
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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
-
- 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
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- Health & Medical Sciences (AREA)
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Abstract
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, and heat transfer medium is inert gas；Its heating steps is：Inert gas is filled with during heating 10-40 minutes, is kept for 1-12 hours and heated, then vacuumized, circulated according to this；Its cooling step is：Stop heating, be filled with inert gas 10-40 minutes, kept for 0.5-6 hours, then vacuumize, circulate according to this.Lithium ion battery rapid draing cool-down method of the invention have firing rate fast, cooling efficiency high and it is with low cost the characteristics of.
Description
Technical field
The present invention relates to technical field of lithium ion, a kind of lithium ion battery rapid draing cool-down method is specifically referred to.
Background technology
Lithium ion battery is a kind of battery for making positive pole with the compound containing lithium with Carbon Materials as negative pole, is entered when to battery
When row charges, there is lithium ion to generate on the positive pole of battery, the lithium ion of generation is by electrolyte movement to negative pole.And as negative pole
Carbon be in layer structure, it has many micropores, and the lithium ion for reaching negative pole is just embedded into the micropore of carbon-coating.Equally, when to electricity
When pond is discharged（I.e. we use the process of battery）, the lithium ion abjection in negative pole carbon-coating is embedded in, positive pole is moved back again.
In charge and discharge process, lithium ion is in the motion state from positive pole → negative pole → positive pole.Lithium ion battery generally has two kinds of external forms：
Cylindrical type and square.Inside battery uses helically wound structures, the very strong polyethylene film of permeability with a kind of very fine
Isolated material is formed in positive and negative pole spacing.Positive pole is included by cobalt acid lithium（Or nickle cobalt lithium manganate, LiMn2O4, LiFePO4 etc.）
And the current collector of aluminium foil composition.Negative pole is made up of the current collector that graphitized carbon material and Copper Foil are constituted.Filled in battery
There is organic electrolyte solution.Safety valve and PTC-element are also equipped with addition（Partial cylinder formula is used）, so that battery is in abnormal shape
Protect the battery from damaging when state and output short-circuit.
Lithium ion battery is because operating voltage is high, small volume, light weight, energy high, memory-less effect, it is pollution-free, put certainly
Electricity it is small, have extended cycle life, be 21 century development the preferable energy.Lithium ion battery is widely used in waterpower, firepower, wind-force and too
Accumulation power supply system, the uninterrupted power source of post and telecommunications, and electric tool, electric bicycle, the electric motorcycles such as positive energy power station
The multiple fields such as car, electric automobile, military equipment, Aero-Space.With the energy the in short supply and world environmental protection in terms of pressure,
Lithium electricity is widely used in electric motor car industry, the particularly appearance of LiFePO 4 material battery now, has more promoted lithium-ion electric
The development and application of pond industry.
At present, lithium ion battery manufacture process flow is generally included：
Slurrying：By automatic batching system by electrode active material（Such as positive pole LiFePO4 or negative pole graphite）, conductive agent etc. presses
Weighed according to constant weight ratio, addition is stirred in the colloid of the adhesive and solvent composition for preparing by a certain percentage, through too high
Speed dispersion is fabricated to slurry after stirring.
Coating：The slurry that pulping process is made is equal according to certain pole piece surface density and thickness requirement using coating machine
It is coated in evenly in metal collector and through overbaking, the moisture in removal slurry.
Film-making：By coated coiled positive plate or negative plate by continuous full-automatic roll squeezer roll-in to appointed thickness,
Cut using continuous full-automatic cutting machine, positive and negative lug has then been respectively welded using automatic pelleter and welding region is added
Patch insulating tape, and by moisture in baking box drying and processing removal pole piece.
Battery core makes：Using sutomatic winding machine, according to positive plate-barrier film-spaced mode of negative plate-barrier film, volume
Around being cylindrical battery core, it is fitted into box hat, enters back into the moisture carried out during baking removes battery core in baking box.
Fluid injection and standing：Battery core is sealed after injecting electrolyte under glove box dew point environment using sealing machine, and right
Battery appearance stands after carrying out cleaning, drying, to ensure that electrolyte fully infiltrates battery core.
Forming and capacity dividing：Charge and discharge electric treatment is carried out to battery, it is ensured that positive/negative plate surface reactive material is fully activated.Carry out again
Battery capacity and voltage detecting, detection data as battery combo data.Spec battery is transferred to cell degradation.
In the manufacturing process of lithium ion battery, processing procedure must be controlled strictly, especially moisture.Moisture is to lithium ion battery
Influence is huge, can mainly cause following adverse consequences：
（1）Electrolyte goes bad
By taking phosphoric acid iron cell as an example, the electrolyte used by ferric phosphate lithium cell is can not to be used under the too high environment of moisture.
Hasten to seal when battery liquid-filling, it is necessary in the environment of less than 1% humidity, and after fluid injection, prevent inside battery and sky
Gas is contacted.If moisture is too high, electrolyte and reaction of moisture generate trace harmful gases, have harmful effect to fluid injection room environment；
This can also influence electrolyte quality in itself so that battery performance is bad.
（2）Cell internal pressure is excessive
Moisture can generate pernicious gas with a kind of reaction of the composition in electrolyte.When moisture is enough, the pressure of inside battery
Just become big, so as to cause battery stress deformation.When internal pressure is high again, battery is just dangerous, and explosion causes electrolysis
Liquid splash, battery fragment is also easily hurted sb.'s feelings.
（3）High internal resistance
When in use, internal resistance is small for battery, and temperature rise is relatively small；If internal resistance is big, temperature rise is relatively large.Moisture content influences internal resistance, water
The big internal resistance of part is high, and the small internal resistance of moisture content is low.
（4）Self discharge is big
Self discharge, refer to battery in the case of not use, electricity can also be lost.When this loss exceedes in the case of regulation
After a certain amount of, this battery is regarded as self discharge high, and moisture content influence self discharge, the big self discharge of moisture content is big, and moisture content is small certainly
Electric discharge is small.
（5）Low capacity
Inside battery moisture is too high, and the active ingredient of electrolyte has been lost, and lithium ion has also been lost so that lithium ion is negative in battery
There is irreversible chemical reaction in pole piece.Lithium ion is consumed, the energy of battery is just reduced.
（6）Battery leakage
When inside battery it is washy when, electrolyte and the water reaction of inside battery, its product will be gas and hydrofluoric acid,
Hydrofluoric acid is the very strong acid of corrosivity in one, and it can corrode the metal parts of inside battery, and then make the final leakage of battery.
If battery leakage, the performance of battery can also corrode dramatic decrease, and electrolyte to the machine of user, draw eventually
Play more dangerous failure.
Current battery core toasts maturation process：Battery core roasting plant uses vacuum drying chamber, will be covered with article to be dried
Charging tray is placed in drying box, closes chamber door, and the interior vavuum pump of case is evacuated.Article is heated to assigned temperature, moisture is out
Begin to evaporate and gradually taken away with vacuumizing.
Existing battery core baking and cool-down method are：Vacuumize and do not use medium, reduction reaches the speed for setting temperature, sealing
The temperature inside the box is uneven, causes baking time long, and space hold is big.
The content of the invention
It is an object of the invention to provide a kind of lithium ion battery rapid draing cool-down method, the uniform of the temperature inside the box is improved
Property, shorten the time, so as to improve efficiency reduces cost, with firing rate is fast, cooling efficiency high and it is with low cost the characteristics of.
The present invention can be achieved through the following technical solutions：
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 10-40 minutes, is kept for 1-12 hours and heated, then vacuumized, according to
This circulation；
Its cooling step is：Stop heating, be filled with inert gas 10-40 minutes, kept for 0.5-6 hours, then vacuumize, according to this
Circulation.
Include that quick heating removes two flows of moisture and fast cooling with quick-drying flow of the invention, it is described fast
The dewatered flow of speed heating：
1. medium is served as to inert gas is injected in vacuum tank by inert gas tube；
2. heat-generating pipe is heated to inert gas；
3. the inert gas of heat enters in battery core, to battery core and moisture content heat conduction；
4. moisture content expansion in battery core；
5. moisture content volatilization in battery core；
6. vacuumize, moisture content is taken away together with inert gas.
The flow of the fast cooling is：
1. medium is served as to inert gas is injected in vacuum tank by inert gas tube；
2 inert gases absorb heat in vacuum tank；
3. inert gas enters in battery core, absorbs heat in battery core；
4. heat is absorbed by inert gas in battery core；
5. vacuum the temperature inside the box tends towards stability saturation, and inert gas is pumped in the vacuum tank of heat；
6. vacuum the temperature inside the box tends towards stability saturation, and inert gas is pumped in the battery core of heat
By cold medium（Inert gas）The heat in the heat and battery core in vacuum tank is absorbed, so as to the temperature in battery core
Quick to reduce, then vacuum takes the mixture of the nitrogen of saturation and moisture content away, so as to reach the effect of fast cooling.
In rapid draing cool-down method of the present invention, need to complete heat and matter simultaneously in heat drying process
Measure the transmission of (moisture), it is ensured that battery core surface moisture vapor partial pressure (concentration) is higher than inert gas moisture vapor partial pressure, it is ensured that lazy
Property gas temperature be higher than battery core temperature.Heat passes to battery core from inert gas, battery core surface moisture is vaporized and is spilt into outer
Portion space, so as to the difference of moisture content occur on battery core surface and inside.Internal moisture is diffused to the surface and vaporized, and makes battery core water
Point content is constantly reduced, and is gradually completing the overall drying of battery core；Cooling is to pass to the low object of temperature from temperature object high, drop
Warm result is that the temperature difference disappears, and after being filled with cryogenic inert gas, battery core heat transfer is taken away to inert gas and with vacuumizing.
Further, the temperature that inert gas is filled with during heating is 20-60 DEG C；The temperature of inert gas is filled with during cooling
Spend is -20-40 DEG C.
Further, the inert gas is nitrogen.
Further, cycle-index during heating is 1-10 times.
Further, cycle-index during cooling is 1-10 times.
A kind of lithium ion battery rapid draing cool-down method of the present invention, with following beneficial effect：
Firstth, firing rate is fast, by inert gas medium convection heat transfer' heat-transfer by convection to battery core during heating；
Secondth, cooling efficiency high, battery core passes through inert gas medium heat-transfer to inert gas during cooling, then the indifferent gas of heat
Body is taken away, so as to reach the effect of cooling；
3rd, with low cost, by effectively shortening heating and temperature fall time, it is high to improve process efficiency, saves production cost.
Specific embodiment
In order that those skilled in the art will better understand the technical solution of the present invention, with reference to embodiment and to this
Invention product is described in further detail.
Embodiment 1
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 40 minutes, is kept for 6.5 hours and heated, then vacuumized, followed according to this
Ring；
Its cooling step is：Stop heating, be filled with inert gas 10 minutes, kept for 6 hours, then vacuumize, circulate according to this.
In the present embodiment, the temperature that inert gas is filled with during heating is 40 DEG C；Inert gas is filled with during cooling
Temperature is -20 DEG C.The inert gas is nitrogen.Cycle-index during heating is 10 times., cycle-index during cooling is 5 times.
Embodiment 2
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 25 minutes, is kept for 1 hour and heated, then vacuumized, circulated according to this；
Its cooling step is：Stop heating, be filled with inert gas 40 minutes, kept for 3.25 hours, then vacuumize, circulate according to this.
In the present embodiment, the temperature that inert gas is filled with during heating is 50 DEG C；Inert gas is filled with during cooling
Temperature is 40 DEG C.The inert gas is nitrogen.Cycle-index during heating is 5 times., cycle-index during cooling is 1 time.
Embodiment 3
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 10 minutes, is kept for 12 hours and heated, then vacuumized, circulated according to this；
Its cooling step is：Stop heating, be filled with inert gas 25 minutes, kept for 0.5 hour, then vacuumize, circulate according to this.
In the present embodiment, the temperature that inert gas is filled with during heating is 60 DEG C；Inert gas is filled with during cooling
Temperature is -30 DEG C.The inert gas is nitrogen.Cycle-index during heating is 1 time., cycle-index during cooling is 10 times.
Embodiment 4
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 20 minutes, is kept for 8 hours and heated, then vacuumized, circulated according to this；
Its cooling step is：Stop heating, be filled with inert gas 30 minutes, kept for 2 hours, then vacuumize, circulate according to this.
In the present embodiment, the temperature that inert gas is filled with during heating is 20 DEG C；Inert gas is filled with during cooling
Temperature is -20 DEG C.The inert gas is nitrogen.Cycle-index during heating is 10 times., cycle-index during cooling is 8 times.
Embodiment 5
The invention discloses a kind of lithium ion battery rapid draing cool-down method, the lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 25 minutes, is kept for 6.5 hours and heated, then vacuumized, followed according to this
Ring；
Its cooling step is：Stop heating, be filled with inert gas 25 minutes, kept for 3.25 hours, then vacuumize, circulate according to this.
In the present embodiment, the temperature that inert gas is filled with during heating is 40 DEG C；Inert gas is filled with during cooling
Temperature is 10 DEG C.The inert gas is nitrogen.Cycle-index during heating is 2 times., cycle-index during cooling is 2 times.
In order to assess the technique effect obtained by the present invention, performance is carried out by Application Example 1 and Application Example 2 respectively
Assessment.
Application Example 1
Baking box 1.5m long, 0.9m wide, 0.7m high；Nitrogen flow is passed through for 94.5L/min, battery core quantity is 7800pcs, step
Such as table 1, shown
Table 1 toasts the influence to battery core moisture
As can be seen from Table 1, this flow is directed to battery core by medium baking removal moisture content, and data display is the present invention be significantly better than
Existing conventional art.
Application Example 2
Baking box 1.5m long, 0.9m wide, 0.7m high；Nitrogen flow is passed through for 94.5L/min, battery core quantity is 7800pcs, step
As shown in table 2
The influence that table 2 is lowered the temperature to battery core temperature
As can be seen from Table 2, this flow is by the capacity in heat and battery core in Absorption of Medium vacuum tank, so as to improve battery core
The method of fast cooling, the data display present invention is significantly better than existing conventional method.
The above, only presently preferred embodiments of the present invention not makees any formal limitation to the present invention；It is all
The those of ordinary skill of the industry can shown in by specification and the above and swimmingly implement the present invention；But, it is all to be familiar with
Professional and technical personnel without departing from the scope of the present invention, makes using disclosed above technology contents
A little variation, modification and evolution equivalent variations, be Equivalent embodiments of the invention；Meanwhile, it is all according to reality of the invention
Variation, modification and evolution of any equivalent variations that matter technology is made to above example etc., still fall within technology of the invention
Within the protection domain of scheme.
Claims (5)
1. a kind of lithium ion battery rapid draing cool-down method, it is characterised in that：The lithium ion battery is placed in baking oven, heat transfer
Medium is inert gas；
Its heating steps is：Inert gas is filled with during heating 10-40 minutes, is kept for 1-12 hours and heated, then vacuumized, according to
This circulation；
Its cooling step is：Stop heating, be filled with inert gas 10-40 minutes, kept for 0.5-6 hours, then vacuumize, according to this
Circulation.
2. lithium ion battery rapid draing cool-down method according to claim 1, it is characterised in that：It is filled with during heating lazy
Property gas temperature be 20-60 DEG C；The temperature that inert gas is filled with during cooling is -20-40 DEG C.
3. lithium ion battery rapid draing cool-down method according to claim 2, it is characterised in that：The inert gas is
Nitrogen.
4. the lithium ion battery rapid draing cool-down method according to Claims 2 or 3, it is characterised in that：Following during heating
Ring number of times is 1-10 times.
5. the lithium ion battery rapid draing cool-down method according to Claims 2 or 3, it is characterised in that：Following during cooling
Ring number of times is 1-10 times.
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| CN201611183892.9A CN106855343A (en) | 2016-12-20 | 2016-12-20 | A kind of lithium ion battery rapid draing cool-down method |
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| CN201611183892.9A CN106855343A (en) | 2016-12-20 | 2016-12-20 | A kind of lithium ion battery rapid draing cool-down method |
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Cited By (7)
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| CN107959047A (en) * | 2017-12-25 | 2018-04-24 | 北京乐华锂能科技有限公司 | A kind of soft package lithium battery and soft package lithium battery water-eliminating method |
| CN108091937A (en) * | 2017-12-04 | 2018-05-29 | 广州市融成锂能锂电池有限公司 | The pole piece drying means and high multiplying power lithium ion battery of a kind of high multiplying power lithium ion battery |
| CN109489346A (en) * | 2018-09-19 | 2019-03-19 | 多氟多（焦作）新能源科技有限公司 | A kind of baking method of lithium ion battery cell |
| CN111948090A (en) * | 2020-08-12 | 2020-11-17 | 东北大学 | Method and device for monitoring moisture content change of material in vacuum drying process |
| CN112595035A (en) * | 2020-12-07 | 2021-04-02 | 山东天瀚新能源科技有限公司 | Efficient baking method for lithium ion battery roll core |
| CN114111228A (en) * | 2021-06-16 | 2022-03-01 | 合肥国轩高科动力能源有限公司 | Lithium battery rapid drying method |
| CN115451662A (en) * | 2022-09-02 | 2022-12-09 | 大连北方互感器集团有限公司 | Vacuum drying operation process of silicon micropowder pre-drying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108091937A (en) * | 2017-12-04 | 2018-05-29 | 广州市融成锂能锂电池有限公司 | The pole piece drying means and high multiplying power lithium ion battery of a kind of high multiplying power lithium ion battery |
| CN107959047A (en) * | 2017-12-25 | 2018-04-24 | 北京乐华锂能科技有限公司 | A kind of soft package lithium battery and soft package lithium battery water-eliminating method |
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| CN111948090A (en) * | 2020-08-12 | 2020-11-17 | 东北大学 | Method and device for monitoring moisture content change of material in vacuum drying process |
| CN111948090B (en) * | 2020-08-12 | 2022-02-01 | 东北大学 | Method and device for monitoring moisture content change of material in vacuum drying process |
| CN112595035A (en) * | 2020-12-07 | 2021-04-02 | 山东天瀚新能源科技有限公司 | Efficient baking method for lithium ion battery roll core |
| CN114111228A (en) * | 2021-06-16 | 2022-03-01 | 合肥国轩高科动力能源有限公司 | Lithium battery rapid drying method |
| CN115451662A (en) * | 2022-09-02 | 2022-12-09 | 大连北方互感器集团有限公司 | Vacuum drying operation process of silicon micropowder pre-drying system |
| CN115451662B (en) * | 2022-09-02 | 2023-10-31 | 大连北方互感器集团有限公司 | Vacuum drying operation process of silica micropowder pre-drying system |
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Application publication date: 20170616 |
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