CN201946659U - Preparation system of battery diaphragm - Google Patents
Preparation system of battery diaphragm Download PDFInfo
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- CN201946659U CN201946659U CN201120063550XU CN201120063550U CN201946659U CN 201946659 U CN201946659 U CN 201946659U CN 201120063550X U CN201120063550X U CN 201120063550XU CN 201120063550 U CN201120063550 U CN 201120063550U CN 201946659 U CN201946659 U CN 201946659U
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- barrier film
- clamping
- track
- diaphragm
- preparation system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a preparation system of a battery diaphragm, which is characterized by comprising a stirring device, an extrusion device, a cooling and molding device, a bidirectional stretching device, an extraction device, a transverse stretching device and a heat treatment device, which are connected sequentially, wherein the transverse stretching device comprises a clamping device which is used for clamping the extracted diaphragm, a track which is used for moving the clamping device forwards, and a support member which is used for supporting the clamping device and the track; and the clamping device comprises a left clamping unit and a right clamping unit at two sides of the diaphragm. The preparation process of the battery diaphragm comprises the steps of stirring, extrusion, cooling and molding, bidirectional stretching, extraction, transverse stretching and heat treatment, which are carried out sequentially. By adopting the preparation method provided by the utility model, ultrathin battery diaphragms with thickness of 6 microns can be made and the advantages of being good in stability and long in service life are shown.
Description
Technical field
The utility model relates to a kind of preparation system, relates in particular to a kind of preparation system 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.
China Patent No. is the method that 200810042043.0 utility model patent has been announced a kind of lithium ion battery separator.The method step of this lithium ion battery separator is as follows:
One, with molecular weight be 7,000,000 ~ 1,000,000 ultra high molecular polyethylene, polynorbornene crosslinking agent, antioxidant and mineral oil by a certain percentage proportioning add that the speed with 40～300rpm fully stirs raw material in the mixer, wherein, the mass ratio of mineral oil and antioxidant is 1500 ~ 1600: 1, the mass ratio of mineral oil and ultra high molecular polyethylene is 4 ~ 8: 1, and the mass ratio of crosslinking agent and mineral oil is 1: 30 ~ 35;
Two, will drop into double screw extruder by the step 1 mixture after being mixed and extrude continuously, form substrate with 100～250 ℃ of heating;
Three, making the substrate extruded from double screw extruder with 2～20 meters/minute speed is that 5～40 ℃ cooling forming machine carries out cooling forming by temperature range;
Four, with 2～20 meters/minute speed substrate is carried out horizontal stroke, vertical two-way simultaneous stretching by biaxial tension equipment, make substrate be drawn into barrier film, the membrane thicknesses of drawing and forming reaches 30～100 μ m, and barrier film acupuncture intensity is 300～600gf;
Five, be that 1500～2500 millimeters barrier film extracts mineral oil in the barrier film by extraction tank with width;
Six, under 100～160 ℃ temperature, barrier film carried out 1～3 minute heat treatment;
Seven, curling lithium battery diaphragm is cut packing.
Said method has solved the even and cost problem of higher of conventional art septation thickness low LCL, but also exists following defective:
The first, the polynorbornene crosslinking agent that uses in the step 1 in the said method has increased cost of manufacture.
The second, behind the mineral oil in the said method extraction barrier film, extractant remaining on the barrier film can not guarantee sufficient volatilization, causes diaphragm quality to descend; Barrier film exists shape to occur the bigger problem of barrier film deviation easily simultaneously.
Three, the qualification of the term of reference of parameters is relatively harsher in the said method, and is all higher to the requirement of raw material and production technology.
The utility model content
The purpose of this utility model is to provide a kind of preparation system of battery diaphragm, to solve lithium ion battery separator substandard products incidence, production requirement and the higher defective of cost that prior art makes.
A kind of preparation system of battery diaphragm, comprise agitating device, extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device and annealing device, and agitating device, extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device, annealing device connect successively.
Preferably, the strutting piece that described 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.
Preferably, track length is 20 ~ 30 meters, and track becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction.
With respect to prior art, the utlity model has following advantage:
1, the utility model has improved technical merit in the use of having removed crosslinking agent aspect the raw material practicality, provides cost savings.
2, power lithium-ion battery barrier film of the present utility model preparation has added the barrier film cross directional stretch, and barrier film has been carried out the work of stretching, correction and typing, remaining extractant is volatilized fully, and reduced the appearance of defect rate.
3, relaxed the limited range of partial parameters, reduced requirement raw material and production technology.
4, new utility model selects for use range of choice wider at supra polymer.
5, can select for use the low extractant of concentration to extract, reach same effect.
6, improved draw speed, can increase work efficiency, reduced cost.
7, 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.
8, by 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 is the preparation system structure chart of a kind of lithium ion battery separator of the utility model embodiment;
Fig. 2 is the cross directional stretch structure drawing of device.
Embodiment
Embodiment 1, and a kind of battery diaphragm in the present embodiment refers to that especially a kind of lithium ion battery separator preparation method's step is as follows:
One, will in ultra high molecular polyethylene, antioxidant and the mineral oil proportioning adding by a certain percentage mixer raw material fully be stirred, wherein, the mass ratio of mineral oil and antioxidant is 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, by 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.
Five, use 80% ~ 99.9% high concentration alkanes extractant, being 1000～3000 barrier film with width extracts mineral oil in the barrier film and one-step pore-creating by extraction tank.
Six, the 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 by cross directional stretch equipment.
Seven, barrier film is carried out 3～15 minutes heat treatment.
In addition, after the heat treatment of barrier film completing steps seven, also need the work that the finished product barrier film is curled, cuts and packs.
Method of the present utility model can prepare equipment by following a kind of power lithium-ion battery barrier film and realize that as shown in Figure 1, it is the preparation system structure chart of a kind of power lithium-ion battery barrier film of the utility model embodiment.The preparation system of this power lithium-ion battery barrier film comprises agitating device 103, extrusion device 105, cooling forming device 107, biaxial tension device 109, extraction equipment 111, cross directional stretch device 113, annealing device 115.And agitating device 103, extrusion device 105, cooling forming device 107, biaxial tension device 109, extraction equipment 111, cross directional stretch device 113, annealing device 115 connect successively.
When the preparation system work of power lithium-ion battery barrier film of the present utility model, at first a certain proportion of ultra high molecular polyethylene, antioxidant and mineral oil are added in the agitating device 103 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 utilized viscosity grade of mineral oil is between 30～60.
Through after the abundant stirring of agitating device 103, its mixture is added extrusion device 105 at ultra high molecular polyethylene, antioxidant and mineral oil, and heat and extrude continuously, form substrate, the thickness of this substrate is 0.1～15mm.Wherein extrusion device 105 can be a double screw extruder, and its screw diameter is 10 ~ 150 millimeters, and extrusion capacity greater than 200 kilograms per hour.
After extrusion device 105 is extruded substrate, the substrate of extruding is passed through cooling forming device 107, substrate is carried out cooling forming.Cooling forming device 107 can be made up of six groups of refrigerating modules, and every pack module has two chill rolls, the temperature difference of every group of refrigerating module, and cooling forming can make in the substrate ultra high molecular polyethylene non-crystallizable, reaches the purpose of film thickness homogeneous.
Behind substrate process cooling forming device 107 cooling formings, carry out horizontal stroke, vertical two-way simultaneous stretching by biaxial tension device 109 again, making substrate be drawn into thickness is 10～150 μ m.Biaxial tension device 109 stretches simultaneously for transverse and longitudinal, can regulate hot strength by regulating stretch ratio, can guarantee that like this film thickness is even, and the transverse and longitudinal stretch ratio can be adjusted according to the thickness degree.
Behind barrier film process biaxial tension device 109 drawing and formings, carry out single extraction through extraction equipment 111 again, and extract the mineral oil in the barrier film.Extraction equipment 111 can be an extraction tank.Extractant in the extraction equipment 111 can be positive flow silane, normal heptane, carrene etc., and wherein the extractant of alkanes can make the mineral oil in the barrier film separate out fully.
Barrier film enters cross directional stretch device 113 after extracting through extraction equipment 111.The strutting piece 1133 that cross directional stretch equipment comprises in order to the clamping device 1131 that clamps the barrier film after the extraction, make track 1132 that clamping device moves forward and clamping device and track are supported.After barrier film entered cross directional stretch device 113, left clamping unit 1131 and right clamping unit clamped the both sides of barrier film.After the clamping, barrier film is along with clamping device 1131 speed with 5 ~ 50 meters/minute under guide rail 1132 effects travels forward.Because track 1132 becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction, along with travelling forward of barrier film, distance between left side clamping unit 1131 and the right clamping unit increases gradually, and barrier film is launched by cross directional stretch gradually, and this process has been finished the correction and the typing of barrier film.Simultaneously, the length setting of guide rail is 20 ~ 30 meters, remains in extractant on the barrier film and can access volatilization more fully in the process of whole motion, and the thickness homogeneity by the cross directional stretch barrier film is controlled better.
By annealing device 115 it is carried out heat treatment in 6～12 minutes at last.
As long as to the barrier film after handling curl, cut and operation such as packing after just can obtain the finished product of power lithium-ion battery barrier film.
With respect to prior art, the utlity model has following advantage:
1, the utility model has improved technical merit in the use of having removed crosslinking agent aspect the raw material practicality, provides cost savings.
2, power lithium-ion battery barrier film preparation flow of the present utility model has added the technology of barrier film cross directional stretch, and barrier film has been carried out the work of stretching, correction and typing, remaining extractant is volatilized fully, and reduced the appearance of defect rate.
3, relaxed the limited range of partial parameters, reduced requirement raw material and production technology.
4, new utility model selects for use range of choice wider at supra polymer.
5, can select for use the low extractant of concentration to extract, reach same effect.
6, stretch with 8 ~ 50 meters/minute speed, can increase work efficiency, reduce cost.
7, use cross directional stretch equipment after, heat treated temperature also will reduce, heat treatment temperature is reduced to 60～150 ℃ by original 100～160 ℃, saves energy consumption, reduces cost.
8, by adding after the cross directional stretch process stretches to barrier film, can produce the wideer lithium battery diaphragm of width.
More than disclosed only be several specific embodiment of the present utility model, but the utility model is not limited thereto, any those skilled in the art can think variation, all should drop in the protection range of the present utility model.
Claims (3)
1. the preparation system of a battery diaphragm, it is characterized in that, comprise agitating device, extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device and annealing device, and agitating device, extrusion device, cooling forming device, biaxial tension device, extraction equipment, cross directional stretch device, annealing device connect successively.
2. the preparation system of battery diaphragm as claimed in claim 1, it is characterized in that, the strutting piece that described 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.
3. the preparation system of battery diaphragm as claimed in claim 2 is characterized in that, track length is 20 ~ 30 meters, and track becomes an oblique angle less than 5 ° outwards to depart from the diaphragm movement direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120063550XU CN201946659U (en) | 2011-03-11 | 2011-03-11 | Preparation system of battery diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120063550XU CN201946659U (en) | 2011-03-11 | 2011-03-11 | Preparation system of battery diaphragm |
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| CN201946659U true CN201946659U (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120063550XU Expired - Fee Related CN201946659U (en) | 2011-03-11 | 2011-03-11 | Preparation system of battery diaphragm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324480A (en) * | 2011-08-30 | 2012-01-18 | 上海乾呈玩具科技有限公司 | Preparation method and system of power lithium ion battery diaphragm |
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2011
- 2011-03-11 CN CN201120063550XU patent/CN201946659U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324480A (en) * | 2011-08-30 | 2012-01-18 | 上海乾呈玩具科技有限公司 | Preparation method and system of power lithium ion battery diaphragm |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20170311 |
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| CF01 | Termination of patent right due to non-payment of annual fee |