CN102315404B - Preparation method and system for power lithium ion battery diaphragm - Google Patents
Preparation method and system for power lithium ion battery diaphragm Download PDFInfo
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- CN102315404B CN102315404B CN201110251850.5A CN201110251850A CN102315404B CN 102315404 B CN102315404 B CN 102315404B CN 201110251850 A CN201110251850 A CN 201110251850A CN 102315404 B CN102315404 B CN 102315404B
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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 diaphragm of power lithium ion battery.
Background technology
Chargeable lithium ion secondary cell has the characteristic of high-energy-density, long circulation life, memory-less effect, has again the advantages such as safe, reliable and energy fast charging and discharging, thereby becomes 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 large growth requirement in countries nowadays energy environment protection aspect, in the use amount of all trades and professions, increase sharply.Secondary lithium battery, except being widely used in the digital electronic goods such as the daily mobile phone of knowing, notebook computer and MP3, is also being brought into use aspect some high power batteries such as electric motor car, electric bicycle 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 affects the characteristic such as capacity, cycle performance of battery.The barrier film of excellent performance has important effect to improving the combination property of battery.But preparation technology in the past can cause the inhomogeneous and membrane thickness unevenness of lithium ion battery separator pore-forming, thereby affect the quality of lithium ion battery.
China Patent No. is a kind of method that 200810042043.0 patent of invention has been announced lithium ion battery separator.The method step of this lithium ion battery separator is as follows:
One, by 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 the speed with 40～300rpm in mixer that raw material are fully stirred, 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, the mixture after being stirred by step 1 is dropped into double screw extruder and extrude continuously with 100～250 ℃ of heating, form substrate;
Three, with the cooling forming machine that the substrate that the speed of 2～20 ms/min makes to extrude from double screw extruder is 5～40 ℃ by temperature range, carry out cooling forming;
Four, by biaxial tension equipment with the speed of 2～20 ms/min to substrate carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 30～100 μ m, barrier film acupuncture intensity is 300～600gf;
Five, by width, be that the barrier film of 1500～2500 millimeters extracts the mineral oil in barrier film by extraction tank;
Six, barrier film is carried out the heat treatment of 1～3 minute at the temperature of 100～160 ℃;
Seven, curling lithium battery diaphragm is cut packing.
Said method has solved conventional art septation thickness low LCL evenly and the higher problem of cost, but also exists following defect:
The first, in said method, be to adopt streamlined processing technology, can increase like this quantity and the cost of process equipment;
The second, the polynorbornene crosslinking agent using in step 1 in said method, has increased cost of manufacture;
The 3rd, after the mineral oil in said method extraction barrier film, extractant remaining on barrier film can not guarantee sufficient volatilization, causes diaphragm quality to decline; Barrier film exists shape easily to occur the problem that barrier film deviation is larger simultaneously;
The 4th, in said method the restriction of the term of reference of parameters harsher, 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 diaphragm of power lithium ion battery, to solve, in prior art, produce lithium ion battery separator substandard products incidence, the higher defect of production requirement that the equipment use amount of lithium ion battery separator is large, equipment cost is higher and make.
In order to achieve the above object, the invention provides a kind of preparation method of diaphragm of power lithium ion battery, comprise the following steps:
One, by ultra high molecular polyethylene, antioxidant and mineral oil by a certain percentage proportioning add in mixer raw material fully stirred;
Two, the mixture after being stirred by step 1 enters the first processing line through shunting and the second processing line is processed respectively simultaneously;
Enter the processing of the mixture of the first processing line:
(1) mixture that enters the first processing line is dropped into double screw extruder heating and extrude continuously, form substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) by biaxial tension equipment to the substrate of cooling forming carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film;
(4) use alkanes extractant, barrier film is extracted to the mineral oil in barrier film by extraction tank;
(5) barrier film after extraction is passed through to transverse stretching equipment, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film;
(6) barrier film is heat-treated;
(7) the finished product barrier film after heat treatment is carried out to rolling;
Enter the processing of the mixture of the second processing line:
(1) mixture that enters the second processing line is dropped into double screw extruder heating and extrude continuously, form substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) by biaxial tension equipment to the substrate of cooling forming carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film;
(4) use alkanes extractant, barrier film is extracted to the mineral oil in barrier film by extraction tank;
(5) barrier film after extraction is passed through to transverse stretching equipment, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film;
(6) barrier film is heat-treated;
(7) the finished product barrier film after heat treatment is carried out to rolling.
Preferably, the strutting piece that described transverse stretching equipment comprises clamping device in order to clamp the barrier film after 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 barrier film both sides, described track length is 20～30 meters, and track becomes an oblique angle that is less than 5 ° outwards to depart from diaphragm movement direction.
Preferably, the molecular weight of the ultra high molecular polyethylene that step 1 is used 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, described in step 2, double screw extruder is extruded continuously with 80～300 ℃ of heating.
Preferably, biaxial tension equipment carries out horizontal stroke, vertical two-way simultaneous stretching with the speed of 5～50 ms/min to substrate, and the membrane thicknesses of drawing and forming is 10～150 μ m.
The concentration of the alkanes extractant that preferably, step 2 is used is 80%～99.9%.
Preferably, transverse stretching equipment described in step 2, shapes to barrier film with the speed of 8～50 ms/min
Preferably, barrier film is carried out the heat treatment of 1～10 minute at the temperature of 60～150 ℃.
Preferably, the finished product barrier film after rolling is cut and packed.
A kind of preparation system of diaphragm of power lithium ion battery, comprise agitating device, the first processing line subsystem and the second processing line subsystem, after described the first processing line subsystem and described the second processing line subsystem are connected to described agitating device, described the first processing line subsystem is identical with described the second processing line subsystem, comprise respectively extrusion device, cooling forming device, two-way stretch device, extraction equipment, transversal stretching device, annealing device and wrap-up, after described extrusion device is connected to described agitating device, described extrusion device, cooling forming device, two-way stretch device, extraction equipment, transversal stretching device, annealing device, wrap-up connects successively.
With respect to prior art, the present invention has the following advantages:
1, the present invention connects two identical processing lines and processes simultaneously after mixer, i.e. the common mixer that uses above of two processing lines has reduced the use amount of equipment, has reduced the cost of equipment;
2, the present invention, in the use of having removed crosslinking agent aspect raw material practicality, has improved technical merit, provides cost savings;
3, diaphragm of power lithium ion battery preparation flow of the present invention has added the technique of barrier film cross directional stretch, barrier film has been carried out to the work of stretching, correction and sizing, makes remaining extractant be volatilized fully simultaneously, and has reduced the appearance of defect rate;
4, relax the limited range of partial parameters, reduced the requirement to raw material and production technology;
5, new invention selects range of choice wider at supra polymer;
6, can select the extractant that concentration is low to extract, reach same effect;
7, improved draw speed, can increase work efficiency, reduced costs;
8, use after transverse stretching equipment, heat treated temperature also will reduce, and heat treatment temperature can be reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces costs;
9, by after adding cross directional stretch process to stretch to barrier film, can produce the wider lithium battery diaphragm of width.
Accompanying drawing explanation
Fig. 1 is the preparation connection diagram of a kind of diaphragm of power lithium ion battery of the present invention;
Fig. 2 is transversal stretching device structure chart.
Embodiment
The utility model provides a kind of preparation method of diaphragm of power lithium ion battery, comprises the following steps:
One, by ultra high molecular polyethylene, antioxidant and mineral oil by a certain percentage proportioning add in mixer raw material fully stirred;
Two, the mixture after being stirred by step 1 enters the first processing line through shunting and the second processing line is processed respectively simultaneously;
Enter the processing of the mixture of the first processing line:
(1) the mixture input double screw extruder heating that enters the 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) by biaxial tension equipment to the substrate of cooling forming carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film;
(4) use alkanes extractant, barrier film is extracted to the mineral oil in barrier film by extraction tank;
(5) barrier film after extraction is passed through to transverse stretching equipment, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film;
(6) barrier film is heat-treated;
(7) the finished product barrier film after heat treatment is carried out to rolling;
Finally, finished product barrier film is cut and packed.
Enter the processing of the mixture of the second processing line:
(1) the mixture input double screw extruder heating that enters the 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) by biaxial tension equipment to the substrate of cooling forming carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film;
(4) use alkanes extractant, barrier film is extracted to the mineral oil in barrier film by extraction tank;
(5) barrier film after extraction is passed through to transverse stretching equipment, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film;
(6) barrier film is heat-treated;
(7) the finished product barrier film after heat treatment is carried out to rolling.
Finally, finished product barrier film is cut and packed.
The first processing line and the second processing line have been used the processing technology of mixer jointly, and the first processing line is identical with equipment and method of operation thereof that the second processing line is used, below enumerates a specific embodiment and is described in detail.
Embodiment 1, and in the present embodiment, a kind of lithium ion battery separator preparation method's step is as follows:
One, by ultra high molecular polyethylene, antioxidant and mineral oil by a certain percentage proportioning add in mixer raw material fully 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, mixture after being stirred by step 1 is entered to the first processing line through shunting and the second processing line is processed respectively simultaneously.
Three, enter the processing of the mixture of the first processing line:
(1) the mixture input double screw extruder heating that enters the first processing line is extruded continuously, forms substrate.
Here the screw diameter of double screw extruder is 10～150 millimeters, its extrusion capacity be 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) by biaxial tension equipment to substrate carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 10～150 μ m.
(4) the high concentration alkanes extractant of use 80%～99.9%, the barrier film that is 1000～3000 by width extracts the mineral oil in barrier film by extraction tank, and one-step pore-creating.
(5) barrier film after extraction is passed through to transverse stretching equipment, with the speed of 5～50 ms/min, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film.
(6) barrier film is carried out to the heat treatment of 3～15 minutes.
(7) complete the heat treatment of (5) at barrier film after, by winder, finished product barrier film is carried out to rolling, and then cut and pack.
Enter the processing of the substrate of the second processing line:
(1) the mixture input double screw extruder heating that enters the second processing line is extruded continuously, forms substrate.
Here the screw diameter of double screw extruder is 10～150 millimeters, its extrusion capacity be 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) by biaxial tension equipment to substrate carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 10～150 μ m.
(4) the high concentration alkanes extractant of use 80%～99.9%, the barrier film that is 1000～3000 by width extracts the mineral oil in barrier film by extraction tank, and one-step pore-creating.
(5) barrier film after extraction is passed through to transverse stretching equipment, with the speed of 5～50 ms/min, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film.
(6) barrier film is carried out to the heat treatment of 3～15 minutes.
(7) complete the heat treatment of (5) at barrier film after, by winder, finished product barrier film is carried out to rolling, and then cut and pack.
Method of the present invention can realize by following a kind of diaphragm of power lithium ion battery Preparation equipment, please refer to Fig. 1, its a kind of power lithium ion battery separator producing system structure chart that is the embodiment of the present invention.This power lithium ion battery separator producing system comprises agitating device 1, the first processing line subsystem and the second processing line subsystem, after the first processing line subsystem and the second processing line subsystem are connected to agitating device 1, the first processing line subsystem is identical with the second processing line subsystem, comprise respectively extrusion device 2, cooling forming device 3, two-way stretch device 4, extraction equipment 5, transversal stretching device 6, annealing device 7 and wrap-up 8, after extrusion device 2 is connected to agitating device 1, extrusion device 2, cooling forming device 3, two-way stretch device 4, extraction equipment 5, transversal stretching device 6, annealing device 7, wrap-up 8 connects successively.
Be that this preparation system comprises agitating device 1, agitating device 1 connects two identical equipment processing lines below, i.e. the first processing line and the second processing line, the first processing line and the second processing line comprise respectively extrusion device 2, cooling forming device 3, two-way stretch device 4, extraction equipment 5, transversal stretching device 6, annealing device 7 and wrap-up 8, extrusion device 2, cooling forming device 3, two-way stretch device 4, extraction equipment 5, transversal stretching device 6, annealing device 7, wrap-up 8 connect successively, after extrusion device 2 is connected to agitating device 1.
When power lithium ion battery separator producing system work of the present invention, first a certain proportion of ultra high molecular polyethylene, antioxidant and mineral oil are added in agitating device 1 and fully 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 ultra high molecular polyethylene is more than 1,000,000.The utilized viscosity grade of mineral oil is between 30～60.
At ultra high molecular polyethylene, antioxidant and mineral oil after the abundant stirring of agitating device 1, obtain mixture, these a little mixtures are through being divided into first via mixture and the second road mixture, first via mixture joins the first processing line, the second road mixture joins the second processing line, the process equipment of the first processing line and the second processing line is identical with processing technology, below take the first processing line and is described as example:
First via mixture is added to 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 double screw extruder, and its screw diameter is 10～150 millimeters, extrusion capacity be greater than 200 kilograms per hour.
The first via substrate of extruding from extrusion device 2 carries out cooling forming by 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 comprised 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 substrate ultra high molecular polyethylene non-crystallizable, reaches the object of film thickness homogeneous.
First via substrate after cooling forming device 3 cooling formings, then by two-way stretch device 4 carry out horizontal stroke, vertical two-way simultaneous stretches, making substrate be drawn into thickness is 10～150 μ m.Two-way stretch device 4 stretches for transverse and longitudinal simultaneously, can guarantee that like this film thickness is even by regulating stretch ratio to regulate hot strength, and transverse and longitudinal stretch ratio can be adjusted according to thickness degree.
Barrier film, after two-way stretch device 4 drawing and formings, then carries out single extraction through extraction equipment 5, and extracts the mineral oil in barrier film.Extraction equipment 5 can be extraction tank.Extractant in extraction equipment 5 can be positive flow silane, normal heptane, carrene etc., and wherein the extractant of alkanes can make the mineral oil in barrier film separate out completely.
Barrier film, after extraction equipment 5 extractions, enters transversal stretching device 6.Please refer to Fig. 2, the strutting piece 603 that transverse stretching equipment comprises clamping device 601 in order to clamp the barrier film after extraction, make track 602 that clamping device moves forward and clamping device and track 602 are supported.When barrier film enters after transversal stretching device 6, left clamping unit and right clamping unit clamp the both sides of barrier film.After clamping, barrier film is along with clamping device 601 speed with 5～50 ms/min under track 602 effects travels forward.Because becoming an oblique angle that is less than 5 ° with diaphragm movement direction, outwards departs from track 602, along with travelling forward of barrier film, distance between left clamping unit 601 and right clamping unit increases gradually, and barrier film is launched by cross directional stretch gradually, and this process has completed correction and the sizing of barrier film.Meanwhile, the length setting of track 602 is 20～30 meters, remains in extractant on barrier film and can access volatilization more fully in the process of whole motion, and the thickness homogeneity by cross directional stretch barrier film is controlled better.
Then by annealing device 7, it is carried out to heat treatment in 6～12 minutes.
Barrier film just becomes finished product barrier film after heat-treating, finished product barrier film carries out curling rolling by wrap-up 8, and then through cutting and the operation such as packing after just can obtain the finished product of diaphragm of power lithium ion battery.
The second road mixture enters the second processing line, and its operating procedure, operating equipment and operational sequence are identical with the first processing line, therefore the 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 and processes simultaneously after mixer, i.e. the common mixer that uses above of two processing lines has reduced the use amount of equipment, has reduced the cost of equipment;
2, the present invention, in the use of having removed crosslinking agent aspect raw material practicality, has improved technical merit, provides cost savings;
3, diaphragm of power lithium ion battery preparation flow of the present invention has added the technique of barrier film cross directional stretch, barrier film has been carried out to the work of stretching, correction and sizing, makes remaining extractant be volatilized fully simultaneously, and has reduced the appearance of defect rate;
4, relax the limited range of partial parameters, reduced the requirement to raw material and production technology;
5, new invention selects range of choice wider at supra polymer;
6, can select the extractant that concentration is low to extract, reach same effect;
7, improved draw speed, can increase work efficiency, reduced costs;
8, use after transverse stretching equipment, heat treated temperature also will reduce, and heat treatment temperature can be reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces costs;
9, by after adding cross directional stretch process to stretch to barrier film, can produce the wider lithium battery diaphragm of width.
Disclosed is above only a specific embodiment of the present invention, but the present invention is not limited thereto, and the changes that any person skilled in the art can think of, all should drop in protection scope of the present invention.
Claims (6)
1. a preparation method for diaphragm of power lithium ion battery, is characterized in that, comprises the following steps:
One, by ultra high molecular polyethylene, antioxidant and mineral oil by a certain percentage proportioning add in mixer raw material fully stirred;
Wherein, the molecular weight of ultra high molecular polyethylene 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;
Two, the mixture after being stirred by step 1 enters the first processing line through shunting and the second processing line is processed respectively simultaneously;
Enter the processing of the mixture of the first processing line:
(1) mixture that enters the first processing line is dropped into double screw extruder heating and extrude continuously, form substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) by biaxial tension equipment to the substrate of cooling forming carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film;
(4) use alkanes extractant, barrier film is extracted to the mineral oil in barrier film by extraction tank;
(5) barrier film after extraction is passed through to transverse stretching equipment, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film;
(6) barrier film is heat-treated;
(7) the finished product barrier film after heat treatment is carried out to rolling;
Enter the processing of the mixture of the second processing line:
(1) mixture that enters the second processing line is dropped into double screw extruder heating and extrude continuously, form substrate;
(2) substrate of extruding from double screw extruder carries out cooling forming through one group of chill roll group;
(3) by biaxial tension equipment to the substrate of cooling forming carry out horizontal stroke, vertical two-way simultaneous stretches, and makes substrate be drawn into barrier film;
(4) use alkanes extractant, barrier film is extracted to the mineral oil in barrier film by extraction tank;
(5) barrier film after extraction is passed through to transverse stretching equipment, barrier film is shaped, stretches, rectified a deviation, and guarantee the volatilization of the remaining extract on barrier film;
(6) barrier film is heat-treated;
(7) the finished product barrier film after heat treatment is carried out to rolling;
Wherein, the strutting piece that described transverse stretching equipment comprises clamping device in order to clamp the barrier film after 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 barrier film both sides, described track length is 20～30 meters, and track becomes an oblique angle that is less than 5 ° outwards to depart from diaphragm movement direction;
Wherein, barrier film is heat-treated and is specially: barrier film is carried out the heat treatment of 1～10 minute at the temperature of 60～150 ℃.
2. the preparation method of diaphragm of power lithium ion battery as claimed in claim 1, is characterized in that, double screw extruder is extruded continuously with 80～300 ℃ of heating described in step 2.
3. the preparation method of diaphragm of power lithium ion battery as claimed in claim 1, is characterized in that, biaxial tension equipment carries out horizontal stroke, vertical two-way simultaneous stretching with the speed of 5～50 ms/min to substrate, and the membrane thicknesses of drawing and forming is 10～150 μ m.
4. the preparation method of diaphragm of power lithium ion battery as claimed in claim 1, is characterized in that, the concentration of the alkanes extractant that step 2 is used is 80%～99.9%.
5. the preparation method of diaphragm of power lithium ion battery as claimed in claim 1, is characterized in that, transverse stretching equipment described in step 2 is shaped to barrier film with the speed of 8～50 ms/min.
6. the preparation method of diaphragm of power lithium ion battery as claimed in claim 1, is characterized in that, the finished product barrier film after rolling is cut and packed.
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| CN103427060B (en) * | 2012-05-22 | 2015-07-08 | 颖台科技股份有限公司 | Production method for porous composite membrane |
| 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 |
| CN107482150B (en) * | 2017-07-21 | 2021-03-19 | 苏州捷力新能源材料有限公司 | Transverse drawing extraction process of lithium battery diaphragm |
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| 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 power lithium ion battery diaphragm |
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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 power lithium ion battery diaphragm |
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