CN102315404A - Preparation method and system for power lithium ion battery diaphragm - Google Patents
Preparation method and system for power lithium ion battery diaphragm Download PDFInfo
- Publication number
- CN102315404A CN102315404A CN201110251850A CN201110251850A CN102315404A CN 102315404 A CN102315404 A CN 102315404A CN 201110251850 A CN201110251850 A CN 201110251850A CN 201110251850 A CN201110251850 A CN 201110251850A CN 102315404 A CN102315404 A CN 102315404A
- Authority
- CN
- China
- Prior art keywords
- barrier film
- processing line
- ion battery
- equipment
- preparation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- Cell Separators (AREA)
Abstract
The invention brings forward a preparation method and system for a power lithium ion battery diaphragm. According to the method, firstly, raw materials are put into a mixer for complete stirring; secondly, stirred mixture is allowed to enter into two same processing lines after shunting for simultaneous processing, wherein, the processing line comprises the following procedures: 1, heating the mixture and extruding out substrates, 2, cooling the substrates to allow molding of the substrates, 3, carrying out simultaneous transverse and longitudinal bidirectional drawing on the molded substrates with bidirectional drawing equipment so as to enable the substrates to become diaphragms under drawing, 4, extracting mineral oil from the diaphragms through an extraction tank by using alkanes as an extractant, 5, fixing, drawing and rectifying the diaphragms after extraction with transverse drawing equipment and ensuring volatilization of residual extracting solution on the diaphragms, and 6, carrying out heat treatment on the diaphragms; thirdly, the finished products of diaphragms are curled, cut and packaged. The invention enables the defects in the prior art that utilization amount of equipment for production of battery diaphragms is great, that cost for the equipment is high and that the incidence rate of substandard products of and production requirements for lithium ion battery diaphragms are high to be overcome.
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, flow into first processing line and second processing line is processed respectively simultaneously by the step 1 mixture after being mixed through dividing;
Get into the processing of the mixture of first processing line:
The mixture input double screw extruder heating that (1) will get into first processing line is extruded continuously, forms substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) carry out horizontal stroke, indulge the two-way simultaneous stretching through the substrate of biaxial tension equipment, make substrate be drawn into barrier film cooling forming;
(4) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(5) 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;
(6) barrier film is heat-treated;
(7) the finished product barrier film after the heat treatment is carried out rolling;
Get into the processing of the mixture of second processing line:
The mixture input double screw extruder heating that (1) will get into second processing line is extruded continuously, forms substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) carry out horizontal stroke, indulge the two-way simultaneous stretching through the substrate of biaxial tension equipment, make substrate be drawn into barrier film cooling forming;
(4) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(5) 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;
(6) barrier film is heat-treated;
(7) 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 2 is 80% ~ 99.9%.
Preferably, the equipment of cross directional stretch described in the step 2 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.
A kind of preparation system of power lithium-ion battery barrier film; Comprise agitating device, the first processing line subsystem and the second processing line subsystem; Said first processing line subsystem and the said second processing line subsystem are connected to after the said agitating device; The said first processing line subsystem is identical with the said second processing line subsystem; Comprise extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device, annealing device and wrap-up respectively; Said extrusion device is connected after the said agitating device, and said extrusion device, cooling forming device, 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 mixer and processes simultaneously, and promptly the front of two processing lines is used mixer 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, flow into first processing line and second processing line is processed respectively simultaneously by the step 1 mixture after being mixed through dividing;
Get into the processing of the mixture of first processing line:
(1) the mixture input double screw extruder heating that gets into first processing line is extruded continuously, forms substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) carry out horizontal stroke, indulge the two-way simultaneous stretching through the substrate of biaxial tension equipment, make substrate be drawn into barrier film cooling forming;
(4) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(5) 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;
(6) barrier film is heat-treated;
(7) 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 the mixture of second processing line:
(1) the mixture input double screw extruder heating that gets into second processing line is extruded continuously, forms substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) carry out horizontal stroke, indulge the two-way simultaneous stretching through the substrate of biaxial tension equipment, make substrate be drawn into barrier film cooling forming;
(4) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(5) 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;
(6) barrier film is heat-treated;
(7) 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 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 flow into first processing line and second processing line is processed respectively simultaneously through dividing by the step 1 mixture after being mixed.
Three, get into the processing of the mixture of first processing line:
(1) the mixture input double screw extruder heating that gets into first processing line is extruded continuously, forms substrate.
Here the screw diameter of double screw extruder is 10 ~ 150 millimeters, and its extrusion capacity greater than 200 kilograms per hour.
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) through biaxial tension equipment substrate is carried out horizontal stroke, vertical two-way simultaneous stretching, make substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 10～150 μ m.
(4) 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.
(5) 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.
(6) barrier film is carried out 3～15 minutes heat treatment.
(7) after barrier film is accomplished the heat treatment of (5), through winder the finished product barrier film is carried out rolling, and then cut and pack.
Get into the processing of the substrate of second processing line:
(1) the mixture input double screw extruder heating that gets into second processing line is extruded continuously, forms substrate.
Here the screw diameter of double screw extruder is 10 ~ 150 millimeters, and its extrusion capacity greater than 200 kilograms per hour.
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) through biaxial tension equipment substrate is carried out horizontal stroke, vertical two-way simultaneous stretching, make substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 10～150 μ m.
(4) 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.
(5) 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.
(6) barrier film is carried out 3～15 minutes heat treatment.
(7) after barrier film is accomplished the heat treatment of (5), 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, the first processing line subsystem and the second processing line subsystem; The first processing line subsystem and the second processing line subsystem are connected to after the agitating device 1; The first processing line subsystem is identical with the second processing line subsystem; Comprise extrusion device 2, cooling forming device 3, biaxial tension device 4, extraction equipment 5, cross directional stretch device 6, annealing device 7 and wrap-up 8 respectively; Extrusion device 2 is connected after the agitating device 1, and extrusion device 2, cooling forming device 3, 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; Agitating device 1 back connects two identical apparatus processing lines; I.e. first processing line and second processing line; First processing line and second processing line comprise extrusion device 2, cooling forming device 3, biaxial tension device 4, extraction equipment 5, cross directional stretch device 6, annealing device 7 and wrap-up 8 respectively; Extrusion device 2, 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 extrusion device 2 is connected after the agitating device 1.
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.
After ultra high molecular polyethylene, antioxidant and the abundant stirring of agitating device 1 of mineral oil process; Obtain mixture; These a little mixtures are through being divided into the first via mixture and the second road mixture, and first via mixture joins first processing line, and the second road mixture joins 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:
First via mixture is added extrusion device 2, 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 first via 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.
Behind first via substrate process 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 602 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 mixer and processes simultaneously, and promptly the front of two processing lines is used mixer 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, flow into first processing line and second processing line is processed respectively simultaneously by the step 1 mixture after being mixed through dividing;
Get into the processing of the mixture of first processing line:
The mixture input double screw extruder heating that (1) will get into first processing line is extruded continuously, forms substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) carry out horizontal stroke, indulge the two-way simultaneous stretching through the substrate of biaxial tension equipment, make substrate be drawn into barrier film cooling forming;
(4) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(5) 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;
(6) barrier film is heat-treated;
(7) the finished product barrier film after the heat treatment is carried out rolling;
Get into the processing of the mixture of second processing line:
The mixture input double screw extruder heating that (1) will get into second processing line is extruded continuously, forms substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) carry out horizontal stroke, indulge the two-way simultaneous stretching through the substrate of biaxial tension equipment, make substrate be drawn into barrier film cooling forming;
(4) use the alkanes extractant, barrier film is extracted the mineral oil in the barrier film through extraction tank;
(5) 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;
(6) barrier film is heat-treated;
(7) 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 2 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 2 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, the first processing line subsystem and the second processing line subsystem; Said first processing line subsystem and the said second processing line subsystem are connected to after the said agitating device; The said first processing line subsystem is identical with the said second processing line subsystem; Comprise extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device, annealing device and wrap-up respectively, said extrusion device is connected after the said agitating device, and said extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device, annealing device, wrap-up connect successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110251850.5A CN102315404B (en) | 2011-08-30 | 2011-08-30 | Preparation method and system for power lithium ion battery diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110251850.5A CN102315404B (en) | 2011-08-30 | 2011-08-30 | Preparation method and system for power lithium ion battery diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102315404A true CN102315404A (en) | 2012-01-11 |
| CN102315404B CN102315404B (en) | 2014-04-09 |
Family
ID=45428353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110251850.5A Expired - Fee Related CN102315404B (en) | 2011-08-30 | 2011-08-30 | Preparation method and system for power lithium ion battery diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102315404B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102731883A (en) * | 2012-06-25 | 2012-10-17 | 上海乾呈玩具科技有限公司 | Preparation method of polyethylene microporous membrane and system thereof |
| CN103427060A (en) * | 2012-05-22 | 2013-12-04 | 颖台科技股份有限公司 | Production method for porous composite membrane |
| WO2015017987A1 (en) * | 2013-08-06 | 2015-02-12 | 深圳市冠力新材料有限公司 | Preparation method of thickness-customized aperture porous membrane |
| CN107482150A (en) * | 2017-07-21 | 2017-12-15 | 苏州捷力新能源材料有限公司 | The horizontal drawing extraction process of lithium battery diaphragm |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345296A (en) * | 2008-08-25 | 2009-01-14 | 陆英 | Preparation method and system for septum of lithium ion battery |
| CN101870164A (en) * | 2009-04-23 | 2010-10-27 | 富士胶片株式会社 | The drawing process of polymer film and the manufacture method of thin polymer film |
| CN202205831U (en) * | 2011-08-30 | 2012-04-25 | 上海乾呈玩具科技有限公司 | Preparation system of diaphragm of power lithium ion battery |
-
2011
- 2011-08-30 CN CN201110251850.5A patent/CN102315404B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345296A (en) * | 2008-08-25 | 2009-01-14 | 陆英 | Preparation method and system for septum of lithium ion battery |
| CN101870164A (en) * | 2009-04-23 | 2010-10-27 | 富士胶片株式会社 | The drawing process of polymer film and the manufacture method of thin polymer film |
| CN202205831U (en) * | 2011-08-30 | 2012-04-25 | 上海乾呈玩具科技有限公司 | Preparation system of diaphragm of power lithium ion battery |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427060A (en) * | 2012-05-22 | 2013-12-04 | 颖台科技股份有限公司 | Production method for porous composite membrane |
| CN103427060B (en) * | 2012-05-22 | 2015-07-08 | 颖台科技股份有限公司 | Production method for porous composite membrane |
| CN102731883A (en) * | 2012-06-25 | 2012-10-17 | 上海乾呈玩具科技有限公司 | Preparation method of polyethylene microporous membrane and system thereof |
| CN102731883B (en) * | 2012-06-25 | 2014-11-05 | 上海乾呈玩具科技有限公司 | Preparation method of polyethylene microporous membrane and system thereof |
| WO2015017987A1 (en) * | 2013-08-06 | 2015-02-12 | 深圳市冠力新材料有限公司 | Preparation method of thickness-customized aperture porous membrane |
| CN107482150A (en) * | 2017-07-21 | 2017-12-15 | 苏州捷力新能源材料有限公司 | The horizontal drawing extraction process of lithium battery diaphragm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102315404B (en) | 2014-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101345296B (en) | Preparation method for septum of lithium ion battery | |
| CN102731883B (en) | Preparation method of polyethylene microporous membrane and system thereof | |
| CN101623947B (en) | Ultra-thin BOPET film and manufacturing method thereof | |
| CN102315404B (en) | Preparation method and system for power lithium ion battery diaphragm | |
| CN102208586B (en) | Method and system for preparing dynamic lithium ion battery diaphragm | |
| CN102601885A (en) | Process for preparing lithium-ion battery diaphragms strengthened by drawing transversely and longitudinally | |
| CN102241142A (en) | Method for producing lithium battery diaphragm and transverse stretcher | |
| CN104559082A (en) | Modified BOPET transparent high-barrier composite membrane and preparing method thereof | |
| CN111391267A (en) | Dry-process single-drawing production process of lithium battery diaphragm | |
| CN102569699A (en) | Preparation method of power lithium battery diaphragm | |
| CN105235226A (en) | High-temperature extrusion method for preparing polyolefin microporous films | |
| CN104538471A (en) | Multi-layer packaging material used for solar module and preparation technology and device thereof | |
| CN104064706A (en) | Production technology of lithium ion battery membrane with uniform aperture and uniform appearance | |
| WO2022247505A1 (en) | Large-area ultra-high molecular weight polyethylene ultra-thin film and preparation method therefor | |
| CN201369354Y (en) | Lithium ion battery diaphragm producing system | |
| CN102509610A (en) | Preparation method for 2.5 mu m polypropylene capacitor thin film | |
| CN102555218B (en) | Method and system for preparing power lithium ion battery diaphragm | |
| CN214447919U (en) | Online recovery unit of sheet leftover bits in PVC sheet production process | |
| CN201946659U (en) | Preparation system of battery diaphragm | |
| CN202210545U (en) | Power lithium battery diaphragm preparation system | |
| CN202205831U (en) | Preparation system of diaphragm of power lithium ion battery | |
| CN201946660U (en) | Power lithium ion battery separator producing system | |
| CN102324480A (en) | Preparation method and system of power lithium ion battery diaphragm | |
| CN102569695B (en) | Preparation method for battery diaphragm | |
| CN202004069U (en) | Power lithium ion battery diaphragm preparation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20140409 Termination date: 20160830 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |