CN201946660U - Power lithium ion battery separator producing system - Google Patents
Power lithium ion battery separator producing system Download PDFInfo
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- CN201946660U CN201946660U CN2011200635637U CN201120063563U CN201946660U CN 201946660 U CN201946660 U CN 201946660U CN 2011200635637 U CN2011200635637 U CN 2011200635637U CN 201120063563 U CN201120063563 U CN 201120063563U CN 201946660 U CN201946660 U CN 201946660U
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- barrier film
- ion battery
- biaxial tension
- power lithium
- lithium ion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model provides a power lithium ion battery separator producing method and system thereof. The power lithium ion battery separator preparation system comprises a stirring device, an extruding device, a cooling and forming device, a bidirectional stretching device, an extracting device, a second bidirectional stretching device and a heat treating device. The stirring device, the extruding device, the cooling and forming device, the bidirectional stretching device, the extracting device, the second bidirectional stretching device and the heat treating device are sequentially connected. Based on the power lithium ion battery separator producing method, six-micrometer ultra thinned battery separators can be produced and have the advantages of good stability, long service life and the like.
Description
Technical field
The utility model relates to a kind of preparation method and system, relates in particular to a kind of power lithium-ion battery barrier film preparation system.
Background technology
The chargeable lithium ion secondary cell has the characteristic of high-energy-density, long circulation life, memory-less effect, have again safety, reliable and can fast charging and discharging etc. advantage, thereby become the focus of novel power supply technical research in recent years.Because lithium ion battery is the free of contamination secondary cell of environmental type, meet the big growth requirement in countries nowadays energy environment protection aspect, increase sharply in the use amount of all trades and professions.Secondary lithium battery is also being brought into use aspect some high power batteries such as electric motor car, electric bicycle except that being widely used in digital electronic goods such as the daily mobile phone of knowing, notebook computer and MP3 in recent years at present.From calendar year 2001, global lithium ion battery output is increasing progressively rapidly with annual 40% speed.
Barrier film is the important component part of lithium ion battery, and its performance has determined interfacial structure, internal resistance of battery etc., directly influences the characteristic such as capacity, cycle performance of battery.The barrier film of excellent performance has important effect to the combination property that improves battery.But preparation technology in the past can cause the inhomogeneous and membrane thickness unevenness of lithium ion battery separator pore-forming, thereby influences the quality of lithium ion battery.
China Patent No. is the method that 200810042043.0 utility model patent has been announced a kind of lithium ion battery separator.The method step of this lithium ion battery separator is as follows:
One, with molecular weight be 7,000,000 ~ 1,000,000 ultra high molecular polyethylene, polynorbornene crosslinking agent, antioxidant and mineral oil by a certain percentage proportioning add that the speed with 40～300rpm fully stirs raw material in the mixer, wherein, the mass ratio of mineral oil and antioxidant is 1500 ~ 1600: 1, the mass ratio of mineral oil and ultra high molecular polyethylene is 4 ~ 8: 1, and the mass ratio of crosslinking agent and mineral oil is 1: 30 ~ 35;
Two, will drop into double screw extruder by the step 1 mixture after being mixed and extrude continuously, form substrate with 100～250 ℃ of heating;
Three, making the substrate extruded from double screw extruder with 2～20 meters/minute speed is that 5～40 ℃ cooling forming machine carries out cooling forming by temperature range;
Four, with 2～20 meters/minute speed substrate is carried out horizontal stroke, vertical two-way simultaneous stretching by biaxial tension equipment, make substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 30～100 μ m, and barrier film acupuncture intensity is 300～600gf;
Five, using 98% ~ 99.5% high concentration alkanes extractant, is that 1500～2500 millimeters barrier film extracts mineral oil in the barrier film by extraction tank with width;
Six, under 100～160 ℃ temperature, barrier film carried out 1～3 minute heat treatment;
Seven, curling lithium battery diaphragm is cut packing.
Said method has solved the even and cost problem of higher of conventional art septation thickness low LCL, but also exists following defective:
The first, the polynorbornene crosslinking agent that uses in the step 1 in the said method has increased cost of manufacture.
The second, behind the mineral oil in the said method extraction barrier film, extractant remaining on the barrier film can not guarantee sufficient volatilization, causes diaphragm quality to descend; Barrier film exists shape to occur the big problem of deviation easily simultaneously.
The utility model content
The purpose of this utility model is to provide a kind of power lithium-ion battery barrier film preparation system, to solve lithium ion battery separator substandard products incidence and the higher defective of cost that prior art makes.
In order to achieve the above object, the utility model provides a kind of power lithium-ion battery barrier film preparation method, may further comprise the steps:
The utility model also proposes a kind of power lithium-ion battery barrier film preparation system, comprise the agitating device that fully stirs in order to a certain proportion of ultra high molecular polyethylene, antioxidant and mineral oil, wherein, the mass ratio of mineral oil and antioxidant is 500 ~ 1800: 1, and the mass ratio of mineral oil and ultra high molecular polyethylene is 3 ~ 9: 1; In order to extruding continuously with 80～300 ℃ of heating through the agitating device mixture after being mixed, form the extrusion device of substrate, it links to each other with agitating device; With so that the substrate that extrusion device is extruded passes through with 5～50 meters/minute speed, and substrate is carried out the cooling forming device of cooling forming with 5～80 ℃ temperature range, it links to each other with extrusion device; In order to the speed with 5～50 meters/minute the substrate through the cooling forming device cooling forming is carried out horizontal stroke, vertical two-way simultaneous stretching, make substrate be drawn into the biaxial tension device that thickness is the barrier film of 10～150 μ m, it links to each other with cooling forming device; Carry out single extraction in order to the barrier film to biaxial tension device drawing and forming, and extract the extraction equipment of barrier film mineral oil in fluid, it links to each other with the biaxial tension device; In order to the second biaxial tension device that the stripped barrier film typing of extraction equipment, stretching, correction, extract is volatilized with 8 ~ 50 meters/minute speed, it links to each other with extraction equipment; To carrying out 1～10 minute heat treated annealing device, it links to each other with the second biaxial tension device barrier film of rectifying a deviation in order to the second biaxial tension device is finalized the design under 60～150 ℃ temperature.
With respect to prior art, the utlity model has following advantage:
1, the utility model has improved technical merit in the use of having removed crosslinking agent aspect the raw material practicality, provides cost savings.
2, power lithium-ion battery barrier film preparation flow of the present utility model has added the technology of barrier film cross directional stretch, and barrier film has been carried out the work of stretching, correction and typing, remaining extractant is volatilized fully, and reduced the appearance of defect rate.
3, new utility model selects for use range of choice wider at supra polymer.
4, can select for use the low extractant of concentration to extract, reach same effect.
5, stretch with 8 ~ 50 meters/minute speed, can increase work efficiency, reduce cost.
6, use cross directional stretch equipment after, heat treated temperature also will reduce, heat treatment temperature is reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces cost.
7, use cross directional stretch equipment after, can produce the wideer barrier film of fabric width by tensile membrane once more.
Description of drawings
Fig. 1 is a kind of lithium ion battery separator preparation system structure chart of the utility model embodiment;
Fig. 2 is the second biaxial tension structure drawing of device.
Embodiment
Embodiment 1, and a kind of power lithium-ion battery barrier film preparation method's step is as follows in the present embodiment:
One, will in ultra high molecular polyethylene, antioxidant and the mineral oil proportioning adding by a certain percentage mixer raw material fully be stirred, wherein, the mass ratio of mineral oil and antioxidant is 500 ~ 1800: 1, and the mass ratio of mineral oil and ultra high molecular polyethylene is 3 ~ 9: 1.
The molecular weight of the molecule of ultra high molecular polyethylene is more than 1,000,000 in the present embodiment.
Two, will drop into double screw extruder by the step 1 mixture after being mixed and extrude continuously, form substrate with 80～300 ℃ of heating.
Here the screw diameter of double screw extruder is 10 ~ 200 millimeters, and its extrusion capacity greater than 200 kilograms per hour.
Three, the substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
Four, with 5～50 meters/minute speed substrate is carried out horizontal stroke, vertical two-way simultaneous stretching by biaxial tension equipment, make substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 10～150 μ m.
Five, be that 1000～3000 millimeters barrier film extracts mineral oil in the barrier film and one-step pore-creating by extraction tank with width.
Six, the barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film with 8 ~ 50 meters/minute speed, and guarantee the volatilization of the remaining extract on the barrier film by cross directional stretch equipment.
Seven, under 60～150 ℃ temperature, barrier film carried out 1～10 minute heat treatment.
In addition, after the heat treatment of barrier film completing steps seven, also need the work that the finished product barrier film is curled, cuts and packs.
The utility model also proposes a kind of power lithium-ion battery barrier film preparation system, and as shown in Figure 1, it is a kind of power lithium-ion battery barrier film preparation system structure chart of the utility model embodiment.This power lithium-ion battery barrier film preparation system comprises agitating device 103, extrusion device 105, cooling forming device 107, biaxial tension device 109, extraction equipment 111, the second biaxial tension device 113, annealing device 115.And agitating device 103, extrusion device 105, cooling forming device 107, biaxial tension device 109, extraction equipment 111, the second biaxial tension device 113, annealing device 115 connect successively.
When power lithium-ion battery barrier film preparation system of the present utility model work, at first will a certain proportion of ultra high molecular polyethylene, antioxidant and mineral oil adds in the agitating device 103 and fully stir.Wherein, the mass ratio of mineral oil and antioxidant is 500 ~ 1800: 1, and the mass ratio of mineral oil and ultra high molecular polyethylene is 3 ~ 9: 1.The molecular weight of ultra high molecular polyethylene is more than 1,000,000.The utilized viscosity grade of mineral oil is between 30～60.
Through after the abundant stirring of agitating device 103, its mixture is added extrusion device 105 at ultra high molecular polyethylene, antioxidant and mineral oil, and extrude continuously with 80～300 ℃ of heating, form substrate, the thickness of this substrate is 0.1～15mm.Wherein extrusion device 105 can be a double screw extruder, and its screw diameter is 10 ~ 150 millimeters, extrusion capacity greater than 200 kilograms per hour, the temperature of head generally can be 80～300 ℃.
After extrusion device 105 is extruded substrate, the substrate of extruding is passed through cooling forming device 107 with 5～50 meters/minute speed, and substrate is carried out cooling forming with 5～80 ℃ temperature range.Cooling forming device 107 can be made up of six groups of chill rolls, the temperature difference of every group of chill roll, and cooling forming can make in the substrate ultra high molecular polyethylene non-crystallizable, reaches the purpose of film thickness homogeneous.
Behind substrate process cooling forming device 107 cooling formings, carry out horizontal stroke, vertical two-way simultaneous stretching by biaxial tension device 109 with 5～50 meters/minute speed again, make substrate be drawn into the barrier film that thickness is 10～150 μ m.Biaxial tension device 109 stretches simultaneously for transverse and longitudinal, can regulate hot strength by regulating stretch ratio, can guarantee that like this film thickness is even, and the transverse and longitudinal stretch ratio can be adjusted according to the thickness degree.
Behind barrier film process biaxial tension device 109 drawing and formings, carry out single extraction through extraction equipment 111 again, and extract the mineral oil in the barrier film.Extraction equipment 111 can be an extraction tank.Extractant in the extraction equipment 111 can be positive flow silane, normal heptane, carrene etc., and wherein the extractant of alkanes can make the mineral oil in the barrier film separate out fully.
Barrier film enters the second biaxial tension device 113 after extracting through extraction equipment 111.The strutting piece 1133 that the second biaxial tension device 113 comprises in order to the clamping device 1131 that clamps the barrier film after the extraction, make track 1132 that clamping device moves forward and clamping device and track are supported.After barrier film entered the second biaxial tension device 113, left clamping unit 1131 and right clamping unit clamped the both sides of barrier film.After the clamping, barrier film is along with clamping device 1131 speed with 5 ~ 50 meters/minute under guide rail 1132 effects travels forward.Because track 1132 becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction, along with travelling forward of barrier film, distance between left side clamping unit 1131 and the right clamping unit increases gradually, and barrier film is launched by cross directional stretch gradually, and this process has been finished the correction and the typing of barrier film.Simultaneously, the length setting of guide rail is 20 ~ 30 meters, remains in extractant on the barrier film and can access volatilization more fully in the process of whole motion, and the thickness homogeneity by the cross directional stretch barrier film is controlled better.The second biaxial tension device also can adopt existing biaxial tension device 109 structures, equally also can realize above-mentioned effect.
At last by annealing device 115 with its under 60～150 ℃ temperature to carrying out heat treatment in 1～10 minute.
As long as to the barrier film after handling curl, cut and operation such as packing after just can obtain the finished product of power lithium-ion battery barrier film.
With respect to prior art, the utlity model has following advantage:
1, the utility model has improved technical merit in the use of having removed crosslinking agent aspect the raw material practicality, provides cost savings.
2, power lithium-ion battery barrier film preparation flow of the present utility model has added the technology of barrier film cross directional stretch, and barrier film has been carried out the work of stretching, correction and typing, remaining extractant is volatilized fully, and reduced the appearance of defect rate.
3, new utility model selects for use range of choice wider at supra polymer.
4, can select for use the low extractant of concentration to extract, reach same effect.
5, stretch with 8 ~ 50 meters/minute speed, can increase work efficiency, reduce cost.
6, use cross directional stretch equipment after, heat treated temperature also will reduce, heat treatment temperature is reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces cost.
7, use cross directional stretch equipment after, can produce the wideer barrier film of fabric width by tensile membrane once more.
More than disclosed only be several specific embodiment of the present utility model, but the utility model is not limited thereto, any those skilled in the art can think variation, all should drop in the protection range of the present utility model.
Claims (3)
1. power lithium-ion battery barrier film preparation system, it is characterized in that, comprise agitating device, extrusion device, cooling forming device, biaxial tension device, extraction equipment, the second biaxial tension device, annealing device, described agitating device, extrusion device, cooling forming device, biaxial tension device, extraction equipment, the second biaxial tension device, annealing device connect successively.
2. a kind of power lithium-ion battery barrier film preparation system as claimed in claim 1, it is characterized in that, the strutting piece that the described second biaxial tension equipment comprises in order to the clamping device that clamps the barrier film after the extraction, make track that clamping device moves forward and clamping device and track are supported, clamping device comprises left clamping unit and the right clamping unit that is positioned at the barrier film both sides, track length is 20 ~ 30 meters, and track becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction.
3. power lithium-ion battery barrier film preparation system as claimed in claim 2 is characterized in that the second biaxial tension device and biaxial tension device adopt same device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200635637U CN201946660U (en) | 2011-03-11 | 2011-03-11 | Power lithium ion battery separator producing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200635637U CN201946660U (en) | 2011-03-11 | 2011-03-11 | Power lithium ion battery separator producing system |
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| CN201946660U true CN201946660U (en) | 2011-08-24 |
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| CN2011200635637U Expired - Fee Related CN201946660U (en) | 2011-03-11 | 2011-03-11 | Power lithium ion battery separator producing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315405A (en) * | 2011-08-30 | 2012-01-11 | 上海乾呈玩具科技有限公司 | Biaxial tension apparatus for power lithium ion battery membrane |
-
2011
- 2011-03-11 CN CN2011200635637U patent/CN201946660U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315405A (en) * | 2011-08-30 | 2012-01-11 | 上海乾呈玩具科技有限公司 | Biaxial tension apparatus for power lithium ion battery membrane |
| CN102315405B (en) * | 2011-08-30 | 2013-11-06 | 上海乾呈玩具科技有限公司 | Biaxial tension apparatus for power lithium ion battery membrane |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20170311 |
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| CF01 | Termination of patent right due to non-payment of annual fee |