CN102324480A - Preparation method and system of power lithium ion battery diaphragm - Google Patents
Preparation method and system of power lithium ion battery diaphragm Download PDFInfo
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- CN102324480A CN102324480A CN201110252076A CN201110252076A CN102324480A CN 102324480 A CN102324480 A CN 102324480A CN 201110252076 A CN201110252076 A CN 201110252076A CN 201110252076 A CN201110252076 A CN 201110252076A CN 102324480 A CN102324480 A CN 102324480A
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Abstract
The invention provides a preparation method and a system of a power lithium ion battery diaphragm. The preparation method comprises the following steps: firstly, adding raw materials into a stirrer for stirring; secondly, heating and extruding in a double screw extruder to obtain a substrate; thirdly, cooling and molding the extruded substrate; fourthly, shunting the substrate after cooling and molding into two identical processing lines for respective and simultaneous processing. The processing route comprises the following steps: 1. performing bidirectional simultaneous stretching of the substrate in transverse and longitudinal directions by a bidirectional stretching apparatus so as to allow the substrate to become a diaphragm; 2. extracting mineral oil in the diaphragm; 3. performing fixing, stretching, and deviation correction of the extracted diaphragm by a transverse stretching apparatus so as to ensure the volatilization of the residual extract on the diaphragm; 4. performing heat treatment of the diaphragm; and finally performing rolling, cutting and packaging of the diaphragm finished product. The invention solves the defects of large using load and high cost of apparatus for battery diaphragm production, and high substandard product yield and high production requirements of the prepared lithium ion battery diaphragms in the prior art.
Description
Technical field
The present invention relates to a kind of preparation method, relate in particular to a kind of preparation method of power lithium-ion battery barrier film.
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.
Chinese patent number is the method that 200810042043.0 patent of invention has been announced a kind of lithium ion battery separator.The method step of this lithium ion battery separator is following:
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, the substrate that uses 2～20 meters/minute speed to make to extrude from double screw extruder is that 5～40 ℃ cooling forming machine carries out cooling forming through temperature range;
Four, with 2～20 meters/minute speed substrate is carried out horizontal stroke, vertical two-way simultaneous stretching through 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, be that 1500～2500 millimeters barrier film extracts the mineral oil in the barrier film through 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 disadvantage:
The first, in the said method processing technology that adopts one continuous line, can increase the quantity and the cost of process equipment like this;
The second, the polynorbornene crosslinking agent that uses in the step 1 in the said method has increased cost of manufacture;
The 3rd, 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 bigger problem of barrier film deviation easily simultaneously;
The 4th, in the said method qualification of the term of reference of parameters relatively harsh, all higher to the requirement of raw material and production technology.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of power lithium-ion battery barrier film, to solve lithium ion battery separator substandard products incidence, the higher defective of production requirement that the equipment use amount of producing lithium ion battery separator in the prior art is big, equipment cost is higher and make.
In order to achieve the above object, the present invention provides a kind of preparation method of power lithium-ion battery barrier film, may further comprise the steps:
One, with in ultra high molecular polyethylene, antioxidant and the mineral oil proportioning adding by a certain percentage mixer raw material fully being stirred;
Two, will drop into the double screw extruder heating by the step 1 mixture after being mixed and extrude continuously, form substrate;
Three, the substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
Four, the substrate behind the cooling forming flows into first processing line and second processing line through branch and processes respectively simultaneously;
Get into the processing of substrate of the cooling forming of first processing line:
(1) substrate that gets into the cooling forming of first processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment, makes substrate be drawn into barrier film;
(2) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment;
(4) barrier film is heat-treated;
(5) the finished product barrier film after the heat treatment is carried out rolling;
Get into the processing of substrate of the cooling forming of second processing line:
(1) substrate that gets into the cooling forming of second processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment, makes substrate be drawn into barrier film;
(2) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment;
(4) barrier film is heat-treated;
(5) the finished product barrier film after the heat treatment is carried out rolling.
Preferably; The strutting piece that said cross directional stretch 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; Said track length is 20 ~ 30 meters, and track becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction.
Preferably, the molecular weight of the employed ultra-high molecular weight polyethylene of step 1 is more than 1,000,000, and 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.
Preferably, the said double screw extruder of step 2 is extruded with 80～300 ℃ of heating continuously.
Preferably, biaxial tension equipment carries out horizontal stroke, vertical two-way simultaneous stretching with 5～50 meters/minute speed to substrate, and the membrane thicknesses of drawing and forming is 10～150 μ m.
Preferably, the concentration of the employed alkanes extractant of step 4 is 80% ~ 99.9%.
Preferably, the equipment of cross directional stretch described in the step 4 is finalized the design to barrier film with 8 ~ 50 meters/minute speed.
Preferably, under 60～150 ℃ temperature, barrier film carried out 1～10 minute heat treatment.
Preferably, the finished product barrier film after the rolling is cut and packed.
The present invention also provides a kind of preparation system of power lithium-ion battery barrier film; Comprise agitating device, extrusion device, cooling forming device, the first processing line subsystem and the second processing line subsystem; Said extrusion device is connected after the said agitating device; Said cooling forming device is connected after the said extrusion device; Said first processing line subsystem and the said second processing line subsystem are connected to after the said cooling forming device, and the said first processing line subsystem is identical with the said second processing line subsystem, comprises biaxial tension device, extraction equipment, cross directional stretch device, annealing device and wrap-up respectively; Said biaxial tension device is connected after the said cooling forming device, and said biaxial tension device, extraction equipment, cross directional stretch device, annealing device, wrap-up connect successively.
With respect to prior art, the present invention has the following advantages:
1, the present invention connects two identical processing lines at the back at cooling forming device and processes simultaneously, and promptly the front of two processing lines is used mixer, extruder and chill roll group jointly, has reduced the use amount of equipment, has reduced the cost of equipment;
2, the present invention has improved technical merit in the use of having removed crosslinking agent aspect the raw material practicality, provides cost savings;
3, power lithium-ion battery barrier film preparation flow of the present invention 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;
4, relaxed the limited range of partial parameters, reduced requirement raw material and production technology;
5, new invention selects for use range of choice wider at supra polymer;
6, can select for use the low extractant of concentration to extract, reach same effect;
7, improved draw speed, can increase work efficiency, reduced cost;
8, behind the use cross directional stretch equipment, heat treated temperature also will reduce, and heat treatment temperature can be reduced to 60～150 ℃ by original 100～160 ℃, save energy consumption, reduces cost;
9, through adding after the cross directional stretch process stretches to barrier film, can produce the wideer lithium battery diaphragm of width.
Description of drawings
Fig. 1 connects sketch map for the preparation of a kind of power lithium-ion battery barrier film of the present invention;
Fig. 2 is the cross directional stretch structure drawing of device.
Embodiment
The present invention provides a kind of preparation method of power lithium-ion battery barrier film, may further comprise the steps:
One, with in ultra high molecular polyethylene, antioxidant and the mineral oil proportioning adding by a certain percentage mixer raw material fully being stirred;
Two, will drop into the double screw extruder heating by the step 1 mixture after being mixed and extrude continuously, form substrate;
Three, the substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
Four, the substrate behind the cooling forming flows into first processing line and second processing line through branch and processes respectively simultaneously;
Get into the processing of substrate of the cooling forming of first processing line:
(1) substrate that gets into the cooling forming of first processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment, makes substrate be drawn into barrier film;
(2) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment;
(4) barrier film is heat-treated;
(5) the finished product barrier film after the heat treatment is carried out rolling;
At last, the finished product barrier film is cut and packed.
Get into the processing of substrate of the cooling forming of second processing line:
(1) substrate that gets into the cooling forming of second processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment, makes substrate be drawn into barrier film;
(2) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment;
(4) barrier film is heat-treated;
(5) the finished product barrier film after the heat treatment is carried out rolling.
At last, the finished product barrier film is cut and packed.
First processing line and second processing line have used the processing technology of mixer, extruder and chill roll group jointly, and first processing line is identical with equipment and method of operation thereof that second processing line uses, below enumerates a specific embodiment and describes in detail.
Embodiment 1, and a kind of lithium ion battery separator preparation method's step is following in the present embodiment:
One, with in ultra high molecular polyethylene, antioxidant and the mineral oil proportioning adding by a certain percentage mixer raw material fully being stirred; Wherein, The mass ratio of mineral oil and antioxidant is 1000 ~ 2000: 1, and the mass ratio of mineral oil and ultra high molecular polyethylene is 2 ~ 10: 1.
The molecular weight of the molecule of the ultra high molecular polyethylene in the present embodiment is more than 1,000,000.
Two, will drop into the double screw extruder heating by the step 1 mixture after being mixed and extrude continuously, form substrate.
Here the screw diameter of double screw extruder is 10 ~ 150 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, the substrate behind the cooling forming flows into first processing line and second processing line through branch and processes respectively simultaneously;
Get into the processing of substrate of the cooling forming of first processing line:
(1) substrate that gets into first processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment to substrate, makes substrate be drawn into barrier film, and the membrane thicknesses of drawing and forming reaches 10～150 μ m.
(2) using 80% ~ 99.9% high concentration alkanes extractant, is that 1000～3000 barrier film extracts the mineral oil in the barrier film through extraction tank with width, and one-step pore-creating.
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film with 5 ~ 50 meters/minute speed, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment.
(4) barrier film is carried out 3～15 minutes heat treatment.
(5) after barrier film is accomplished the heat treatment of (4), through winder the finished product barrier film is carried out rolling, and then cut and pack.
Get into the processing of substrate of the cooling forming of second processing line:
(1) substrate that gets into second processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment to substrate, makes substrate be drawn into barrier film, and the membrane thicknesses of drawing and forming reaches 10～150 μ m.
(2) using 80% ~ 99.9% high concentration alkanes extractant, is that 1000～3000 barrier film extracts the mineral oil in the barrier film through extraction tank with width, and one-step pore-creating.
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film with 5 ~ 50 meters/minute speed, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment.
(4) barrier film is carried out 3～15 minutes heat treatment.
(5) after barrier film is accomplished the heat treatment of (4), through winder the finished product barrier film is carried out rolling, and then cut and pack.
Method of the present invention can prepare equipment through following a kind of power lithium-ion battery barrier film and realize that please refer to Fig. 1, it is a kind of power lithium-ion battery barrier film preparation system structure chart of the embodiment of the invention.This power lithium-ion battery barrier film preparation system comprises agitating device 1, extrusion device 2, cooling forming device 3, the first processing line subsystem and the second processing line subsystem; Extrusion device 2 is connected after the agitating device 1; Cooling forming device 3 is connected after the extrusion device 2; The first processing line subsystem and the second processing line subsystem are connected to after the cooling forming device 3; The first processing line subsystem is identical with the second processing line subsystem; Comprise biaxial tension device 4, extraction equipment 5, cross directional stretch device 6, annealing device 7 and wrap-up 8 respectively, biaxial tension device 4 is connected after the cooling forming device 3, and biaxial tension device 4, extraction equipment 5, cross directional stretch device 6, annealing device 7, wrap-up 8 connect successively.
Be that this preparation system comprises agitating device 1, extrusion device 2, cooling forming device 3; Agitating device 1, extrusion device 2, cooling forming device 3 connect successively; Cooling forming device 3 back connect two identical apparatus processing lines; I.e. first processing line and second processing line; First processing line and second processing line comprise biaxial tension device 4, extraction equipment 5, cross directional stretch device 6, annealing device 7 and wrap-up 8 respectively, and cooling forming device 3, biaxial tension device 4, extraction equipment 5, cross directional stretch device 6, annealing device 7, wrap-up 8 connect successively, and biaxial tension device 4 is connected after the cooling forming device 3.
When power lithium-ion battery barrier film preparation system of the present invention is worked, at first a certain proportion of ultra high molecular polyethylene, antioxidant and mineral oil are added in the agitating device 1 and fully stir.Wherein, the mass ratio of mineral oil and antioxidant is 1000 ~ 2000: 1, and the mass ratio of mineral oil and ultra high molecular polyethylene is 2 ~ 10: 1.The molecular weight of ultra high molecular polyethylene is more than 1,000,000.The viscosity grade capable of using of mineral oil is between 30～60.
Through after the abundant stirring of agitating device 1, its mixture is added extrusion device 2 at ultra high molecular polyethylene, antioxidant and mineral oil, and heat and extrude continuously, form substrate, the thickness of this substrate is 0.1～15mm.Wherein extrusion device 2 can be a double screw extruder, and its screw diameter is 10 ~ 150 millimeters, and extrusion capacity greater than 200 kilograms per hour.
The substrate of extruding from extrusion device 2 carries out cooling forming through cooling forming device 3.Wherein, cooling forming device 3 comprises some groups of refrigerating modules, and every pack module comprises two chill rolls.In the present embodiment, cooling forming device 3 can be made up of six groups of refrigerating modules, and every pack module has two chill rolls, and the temperature of every group of refrigerating module is different, and cooling forming can make in the substrate ultra high molecular polyethylene non-crystallizable, reaches the purpose of film thickness homogeneous.
Through the substrate behind cooling forming device 3 cooling formings; Be split into two-way through two conveyer belts; Be the first via substrate and the second roadbed sheet, first via substrate gets into first processing line, and the second roadbed sheet gets into second processing line; The process equipment of first processing line and second processing line is identical with processing technology, below is that example is described with first processing line:
Through the first via substrate behind cooling forming device 3 cooling formings, carry out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension device 4 again, making substrate be drawn into thickness is 10～150 μ m.Biaxial tension device 4 stretches for transverse and longitudinal simultaneously, can regulate hot strength through 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 4 drawing and formings, carry out single extraction through extraction equipment 5 again, and extract the mineral oil in the barrier film.Extraction equipment 5 can be an extraction tank.Extractant in the extraction equipment 5 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 gets into cross directional stretch device 6 after extracting through extraction equipment 5.Please refer to Fig. 2, the strutting piece 603 that cross directional stretch equipment comprises in order to the clamping device 601 that clamps the barrier film after the extraction, make track 602 that clamping device moves forward and clamping device and track are supported.After barrier film got into cross directional stretch device 6, left clamping unit and right clamping unit clamped the both sides of barrier film.After the clamping, barrier film is along with clamping device 601 speed with 5 ~ 50 meters/minute under track 602 effects travels forward.Because track 602 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 601 and the right clamping unit increases gradually, and barrier film is launched by cross directional stretch gradually, and this process has been accomplished the correction and the typing of barrier film.Simultaneously, the length setting of track 602 is 20 ~ 30 meters, in the process of whole motion, remains in extractant on the barrier film and can access volatilization more fully, and the thickness homogeneity through the cross directional stretch barrier film is controlled better.
Through annealing device 7 it is carried out heat treatment in 6～12 minutes then.
Just become the finished product barrier film after barrier film is heat-treated, the finished product barrier film is through wrap-up 8 rolling of curling, and then through cutting and operation such as packing after just can obtain the finished product of power lithium-ion battery barrier film.
The second road mixture gets into second processing line, and its operating procedure, operating equipment and operational sequence and first processing line are identical, so present embodiment no longer elaborates.
With respect to prior art, the present invention has the following advantages:
1, the present invention connects two identical processing lines at the back at cooling forming device and processes simultaneously, and promptly the front of two processing lines is used mixer, extruder and chill roll group jointly, has reduced the use amount of equipment, has reduced the cost of equipment;
2, the present invention has improved technical merit in the use of having removed crosslinking agent aspect the raw material practicality, provides cost savings;
3, power lithium-ion battery barrier film preparation flow of the present invention 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;
4, relaxed the limited range of partial parameters, reduced requirement raw material and production technology;
5, new invention selects for use range of choice wider at supra polymer;
6, can select for use the low extractant of concentration to extract, reach same effect;
7, improved draw speed, can increase work efficiency, reduced cost;
8, behind the use cross directional stretch equipment, heat treated temperature also will reduce, and heat treatment temperature can be reduced to 60～150 ℃ by original 100～160 ℃, save energy consumption, reduces cost;
9, through adding after the cross directional stretch process stretches to barrier film, can produce the wideer lithium battery diaphragm of width.
More than disclosedly be merely a specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (10)
1. the preparation method of a power lithium-ion battery barrier film is characterized in that, may further comprise the steps:
One, with in ultra high molecular polyethylene, antioxidant and the mineral oil proportioning adding by a certain percentage mixer raw material fully being stirred;
Two, will drop into the double screw extruder heating by the step 1 mixture after being mixed and extrude continuously, form substrate;
Three, the substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
Four, the substrate behind the cooling forming flows into first processing line and second processing line through branch and processes respectively simultaneously;
Get into the processing of substrate of the cooling forming of first processing line:
(1) substrate that gets into the cooling forming of first processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment, makes substrate be drawn into barrier film;
(2) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment;
(4) barrier film is heat-treated;
(5) the finished product barrier film after the heat treatment is carried out rolling;
Get into the processing of substrate of the cooling forming of second processing line:
(1) substrate that gets into the cooling forming of second processing line carries out horizontal stroke, vertical two-way simultaneous stretching through biaxial tension equipment, makes substrate be drawn into barrier film;
(2) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(3) barrier film after will extracting is finalized the design, stretches, is rectified a deviation barrier film, and guarantee the volatilization of the remaining extract on the barrier film through cross directional stretch equipment;
(4) barrier film is heat-treated;
(5) the finished product barrier film after the heat treatment is carried out rolling.
2. the preparation method of power lithium-ion battery barrier film as claimed in claim 1; It is characterized in that; The strutting piece that said cross directional stretch 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, and said track length is 20 ~ 30 meters, and track becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction.
3. the preparation method of power lithium-ion battery barrier film as claimed in claim 1; It is characterized in that; The molecular weight of the employed ultra-high molecular weight polyethylene of step 1 is more than 1,000,000; 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.
4. the preparation method of power lithium-ion battery barrier film as claimed in claim 1 is characterized in that, the said double screw extruder of step 2 is extruded with 80～300 ℃ of heating continuously.
5. the preparation method of power lithium-ion battery barrier film as claimed in claim 1 is characterized in that, biaxial tension equipment carries out horizontal stroke, vertical two-way simultaneous stretching with 5～50 meters/minute speed to substrate, and the membrane thicknesses of drawing and forming is 10～150 μ m.
6. the preparation method of power lithium-ion battery barrier film as claimed in claim 1 is characterized in that, the concentration of the employed alkanes extractant of step 4 is 80% ~ 99.9%.
7. the preparation method of power lithium-ion battery barrier film as claimed in claim 1 is characterized in that, the equipment of cross directional stretch described in the step 4 is finalized the design to barrier film with 8 ~ 50 meters/minute speed.
8. the preparation method of power lithium-ion battery barrier film as claimed in claim 1 is characterized in that, under 60～150 ℃ temperature, barrier film is carried out 1～10 minute heat treatment.
9. the preparation method of power lithium-ion battery barrier film as claimed in claim 1 is characterized in that, the finished product barrier film after the rolling is cut and packed.
10. the preparation system of a power lithium-ion battery barrier film; It is characterized in that; Comprise agitating device, extrusion device, cooling forming device, the first processing line subsystem and the second processing line subsystem; Said extrusion device is connected after the said agitating device, and said cooling forming device is connected after the said extrusion device, and said first processing line subsystem and the said second processing line subsystem are connected to after the said cooling forming device; The said first processing line subsystem is identical with the said second processing line subsystem; Comprise biaxial tension device, extraction equipment, cross directional stretch device, annealing device and wrap-up respectively, said biaxial tension device is connected after the said cooling forming device, and said biaxial tension device, extraction equipment, cross directional stretch device, annealing device, wrap-up connect successively.
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| CN201110252076A CN102324480A (en) | 2011-08-30 | 2011-08-30 | Preparation method and system of power lithium ion battery diaphragm |
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| CN201110252076A CN102324480A (en) | 2011-08-30 | 2011-08-30 | Preparation method and system of power lithium ion battery diaphragm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111129395A (en) * | 2019-12-12 | 2020-05-08 | 中材锂膜有限公司 | Transverse stretching and shrinking shaping process after extraction of wet lithium battery diaphragm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201946659U (en) * | 2011-03-11 | 2011-08-24 | 上海乾呈玩具科技有限公司 | Preparation system of battery diaphragm |
| CN202210545U (en) * | 2011-08-30 | 2012-05-02 | 上海乾呈玩具科技有限公司 | Power lithium battery diaphragm preparation system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201946659U (en) * | 2011-03-11 | 2011-08-24 | 上海乾呈玩具科技有限公司 | Preparation system of battery diaphragm |
| CN202210545U (en) * | 2011-08-30 | 2012-05-02 | 上海乾呈玩具科技有限公司 | Power lithium battery diaphragm preparation system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111129395A (en) * | 2019-12-12 | 2020-05-08 | 中材锂膜有限公司 | Transverse stretching and shrinking shaping process after extraction of wet lithium battery diaphragm |
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Application publication date: 20120118 |