CN102881852A - Method and device for manufacturing microporous films - Google Patents
Method and device for manufacturing microporous films Download PDFInfo
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- CN102881852A CN102881852A CN2012103699714A CN201210369971A CN102881852A CN 102881852 A CN102881852 A CN 102881852A CN 2012103699714 A CN2012103699714 A CN 2012103699714A CN 201210369971 A CN201210369971 A CN 201210369971A CN 102881852 A CN102881852 A CN 102881852A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a method and a device for manufacturing microporous films. The method and the device are used for continuous manufacturing of a first film material and a second film material and are characterized in that the method includes: step A, extruding a thin film to obtain the first film material and the second film material; step B, connecting the first film material and the second film material to form a connection film material; and step C, stretching the second film material. In the method for manufacturing the microporous films, the first film material and the second film material are directly hot-seal connected, or the first film material and the second film material are connected by a third film material, so that continuous manufacturing during reel alternation in microporous film manufacturing is achieved, and stability and manufacturing efficiency of the manufacturing process are improved.
Description
Technical field
The present invention relates to a kind of production method and equipment thereof of microporous barrier, espespecially a kind of production method and equipment thereof of the microporous barrier for battery isolating film.
Background technology
The production method of lithium battery diaphragm mainly is divided into two classes at present: dry process and wet method preparation.Dry process refers to that polymer melt at first obtains unidirectional tubulose alignment films by melt extruding, then promote the crystalline texture of material by heat treatment, next a large amount of microcellular structure formed by stretching, last at high temperature thermal finalization discharges internal stress and obtains the little microporous barrier of shrinkage.The wet method preparation is with high polymer and the miscible formation homogeneous phase solution of high boiling compound, then passes through extrusion, stretching, extractant, obtains the micropore barrier film finally by drying.Dry process and wet method preparation all need stretched formation micropore barrier film.
In the actual production, before stretching, the blank film material that melt extrudes (or extrusion) can be reeled to be fixed in and carry out again drawing process on the unreeling shaft.Because unreeling shaft bears pressure limit, bear only the coiled strip of constant weight, but actual production may need a volume blank film material incessantly, therefore, can regularly change the new blank film material of a volume on unreeling shaft, and the end of reel of the blank film material that last volume is just being stretched engages with the volume head of a new volume blank film material, in order to produce continuously.Traditional film mode that connects is artificial entanglement film, or double faced adhesive tape or glue coating engage.Film entanglement meeting causes the loss of coiled strip so that very long one section of film can not open and flatly be held, and has reduced productivity ratio, in addition, can produce large joint owing to tangle, and roll need to be opened, and treats that joint closes later, can have influence on the stable of processing procedure; The tension force of the poor generation of drawing process middling speed may cause double faced adhesive tape or glue coating juncture to form disconnected film phenomenon, and it is stable finally can to affect processing procedure, if to be joinedly pointed out the hot-stretch baking oven that the speed that stretches is set is poor again, can reduce productivity ratio equally.
Summary of the invention
Therefore, one of purpose of the present invention is to provide a kind of film method that connects, to solve the technical problem in the above-mentioned microporous barrier preparation process.
The invention provides a kind of method for producing microporous barrier, be used for the continuous production of the first film material and the second film material, it is characterized in that the method comprises: steps A. this first film material of film extrusion and this second film material; Step B. connects this first film material and this second film material forms the junctional membrane material; Step C. this second film material that stretches.
As further alternative technical scheme, in step B, the method specifically comprises: the end of reel of stacked this first film material of step D. is first in the volume of this second film material; Step e. seal the stacked place of this first film material and this second film material.
As further alternative technical scheme, in step B, the method specifically comprises: step F. stacked one section tertiary membrane material is in the end of reel of this first film material and the volume head of this second film material; Step G. seals the stacked place of this first film material and this tertiary membrane material and the stacked place of this second film material and this tertiary membrane material.
As further alternative technical scheme, the method comprises that also this junctional membrane material of cooling is to room temperature behind step B.
As further alternative technical scheme, the method is the dry type preparation method, and the method also comprises this first film material of heat treatment and this second film material before step B; Step C is described to be stretched as cold stretch.
As further alternative technical scheme, this first film material is in stretching step, and this second film material has been finished the pending stretching step of heat treatment step.
As further alternative technical scheme, the method is the wet type preparation method, the described uniaxial tension or biaxial stretch-formed that is stretched as of step C.
As further alternative technical scheme, this first film material is in stretching step, and this second film material has been finished the pending stretching step of film extrusion step.
The invention provides a kind of microporous barrier production equipment, this equipment comprises heat sealing machine.
As further alternative technical scheme, this equipment comprises stretching-machine, is provided with unreeling shaft before this stretching-machine, and when connecing film, this heat sealing machine is arranged between unreeling shaft and this stretching-machine; When connecing the film end, this heat sealing machine leaves the position between this unreeling shaft and this stretching-machine.
Compared with prior art, the film method that connects of the present invention engages by the first film material is directly sealed with the second film material, or by the tertiary membrane material the first film material is connected with the second film material, realize the continuous production of change of lap process in the microporous barrier production, improved stability and the production efficiency of processing procedure.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of dry process microporous barrier of the present invention.
Fig. 2 is the flow chart of an embodiment of dry process microporous barrier of the present invention.
Fig. 3 A and Fig. 3 B are the schematic diagram of another embodiment of dry process microporous barrier of the present invention.
Fig. 4 is the flow chart of another embodiment of dry process microporous barrier of the present invention.
Fig. 5 is the flow chart that wet method of the present invention prepares a preferred embodiment of microporous barrier.
Fig. 6 is the flow chart that wet method of the present invention prepares another preferred embodiment of microporous barrier.
Embodiment
For making purpose of the present invention, structure, feature and function thereof there are further understanding, hereby cooperate embodiment to be described in detail as follows.
The microporous barrier of embodiment of the present invention is to describe as an example of battery isolating film example, and in other embodiment, this method also is applicable to the microporous barrier (such as used filter membranes such as filtration, ultrafiltration) of other kind.Below all take the production method of battery isolating film as example describes, repeat no more.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of an embodiment of dry process microporous barrier.Method for producing microporous barrier of the present invention is used for the consecutive production of the first film material 10 and the second film material 20, the first film material 10 is held in the roll 3 of cold stretch machine, and the first film material 10 has also been finished film extrusion and heat treatment step, be in the cold stretch step, the front end coiled strip of the first film material 10 has carried out or has been in cold stretch technique, and its end of reel then is the blank that stretches; The roll of cold stretch machine may more than one group in the actual production, and the embodiment of the invention is all with one group of signal, and may also have some other trickle mechanism before the cold stretch machine board, and is also not shown herein, and namely this sentences one group of roll 3 and illustrates the cold stretch machine.The second film material 20 is wound on the unreeling shaft 1 that is arranged on before the cold stretch machine, and the second film material 20 is successively through film extrusion and heat treatment step, pending cold stretch step, and the second film material 20 is blanks that entire volume stretches.It below is the concrete production procedure that process in detail is produced the first film material 10 and the second film material 20 continuously.
Please refer to Fig. 2, Fig. 2 is the flow chart of an embodiment of dry process microporous barrier of the present invention, specifically may further comprise the steps:
101: film extrusion the first film material 10 and the second film material 20.
102: heat treatment the first film material 10 and the second film material 20.
103: the end of reel of stacked the first film material 10 is first in the volume of the second film material 20.
As shown in Figure 1, the end of reel of the first film material 10 is stacked and placed on the volume head of the second film material 20, certainly, the volume head of the second film material 20 can also be stacked and placed on the end of reel of the first film material 10 during actual production.
104: seal the stacked place of the first film material 10 and the second film material 20, form the junctional membrane material.As shown in Figure 1, after step 103 finishes, heat sealing machine 2 is moved to the first film material 10 between the roll 3 of unreeling shaft 1 and cold stretch machine and the stacked place of the second film material 20, open heat sealing machine 2, be heated to sealing temperature the film material at stacked place is carried out hot-press sealed (namely connecing film), so that the first film material 10 and the second film material 20 form the junctional membrane materials.Sealing temperature is relevant with the material of the first film material 10 and the second film material 20.
When the first film material 10 was identical material with the second film material 20, heat-sealing temperature need be higher than the vitrification point of the first film material 10 or the second film material 20, and was lower than the melting temperature of the first film material 10 or the second film material 20+10 ℃.For instance, the vitrification point of supposing the first film material 10 is 110 ℃, and fusing point is 130 ℃, and then the scope of heat-sealing temperature is in 110 ℃-140 ℃.When the first film material 10 and the second film material 20 during for identical material not, can be through the purpose of heat fused sealing for reaching the first film material 10 and the second film material 20, and consider and produce microporous barrier material character commonly used, the fusing point of the first film material 10 and the second film material 20 need differ in 40 ℃, certainly, in actual production, when connecing film for the film material of other unlike material, this fusing point is poor not as limit.One of them has higher melt the first film material 10 and the second film material 20, in present embodiment, the first film material 10 is for having higher melt person, and also has higher vitrification point, and then heat-sealing temperature is higher than the vitrification point of the first film material 10 and is lower than the fusing point of the first film material 10+10 ℃.The fusing point of supposing the first film material 10 is that 135 ℃, vitrification point are 100 ℃, and then heat-sealing temperature is between 100 ℃-145 ℃.In other embodiment, can also exist the second film material 20 have simultaneously higher melt with than high glass transition temperature, or first film material 10 one of them have higher melt, wherein another has the situation than high glass transition temperature, and heat-sealing temperature then is to be higher than this than high glass transition temperature and to be lower than this higher melt+10 ℃ to choose.
105: cooling junctional membrane material is to room temperature.The first film material 10 and the second film material 20 after the sealing need to be cooled to first room temperature, treat the end of reel of the first film material 10 and the second film material 20 and the film material stable bond at the stacked place of volume head, just can carry out follow-up drawing process, peel off in case the film material at stacked place is stretched to cause.After step 105 was finished, heat sealing machine 2 left the position between the roll 3 of unreeling shaft 1 and cold stretch machine, to avoid hindering the subsequent production of the first film material 10 and the second film material 20.
Above-mentioned steps 103 to step 105 has namely been finished the step that connects the first film material 10 and the second film material 20 formation junctional membrane materials, need to prove, when carrying out the Connection Step of above-mentioned two film materials, the front end coiled strip of the first film material 10 has carried out the cold stretch step, the second film material 20 has then been finished heat treatment step, just pending cold stretch, the end of reel of the first film material 10 have formed the junctional membrane material after being connected with the volume of the second film material 20 is first.
106: cold stretch the second film material 20.
Need to prove herein, peel off and that the different stretchings speed of bringing of the first film material 10 and the second film material 20 materials etc. differ from is different for anti-, stacked place and near film material thereof for the junctional membrane material do not arrange fast poor the stretching, but this stacked place and near roll drive the film material at stacked place with identical speed, it is poor for example to treat that this stacked place begins to arrange speed later about 1m, and the second film material 20 is stretched.Certainly, in actual production, it is poor how far the combination degree that need look the first film material 10 and the second film material 20 determines at stacked place later that distance arranges speed again.
107: successively hot-stretch and heat setting the first film material 10 and the second film material 20.
Above-mentioned steps has namely been finished the continuous flow procedure of dry process microporous barrier.
Please referring to Fig. 3 A and Fig. 3 B, Fig. 3 A and Fig. 3 B are the schematic diagram of another embodiment of dry process microporous barrier of the present invention.Be with difference embodiment illustrated in fig. 1, when present embodiment is connected with the second film material 20 at the first film material 10, introduced a bit of tertiary membrane material 30 (shown in dash area among Fig. 3 A and Fig. 3 B).Specifically please refer to Fig. 4, Fig. 4 is the flow chart of another embodiment of dry process microporous barrier of the present invention, has been described in detail in the present embodiment, and the first film material 10 is connected with the second film material 20, specifically comprises:
201: film extrusion the first film material 10 and the second film material 20.
202: heat treatment the first film material 10 and the second film material 20.
203: stacked one section tertiary membrane material 30 is on the volume head of the end of reel of the first film material 10 and the second film material 20.
204: seal the first film material 10 and the stacked place of tertiary membrane material 30 and the stacked place of the second film material 20 and tertiary membrane material 30.
In the present embodiment, the length of tertiary membrane material 30 need to not only overlapping with the end of reel of the first film material 10 but also with first overlapping being advisable of the volume of the second film material 20, shown in Fig. 3 A and Fig. 3 B, so that heat sealing machine 2 is enough to and the stacked place hot-press sealed (connection) of the first film material 10 with tertiary membrane material 30 can be arrived, and with the second film material 20 with the stacked place hot-press sealed of tertiary membrane material 30 to, reach the purpose that the first film material 10 and the second film material 20 are coupled together by tertiary membrane material 30.
Behind completing steps 203, heat sealing machine 2 need be moved to the stacked place of film material between unreeling shaft 1 and the roll 3, respectively the first film material 10 is connect film with the stacked place of tertiary membrane material 30 and the stacked place of the second film material 20 and tertiary membrane material 30.In present embodiment, heat-sealing temperature is determined with vitrification point and the fusing point of tertiary membrane material 30 by the first film material 10, the second film material 20.Specifically, one of them has higher vitrification point and higher fusing point the first film material 10, the second film material 20 and tertiary membrane material 30, and the first film material 10, the second film material 20 differ in 40 ℃ with the melting temperature of tertiary membrane material 30, one of them has the first film material 10, the second film material 20 and tertiary membrane material 30 than high glass transition temperature, and then heat-sealing temperature is higher than this than high glass transition temperature and is lower than this higher melt+10 ℃.In present embodiment, the first film material 10 has higher fusing point, and has simultaneously higher vitrification point, and the vitrification point of supposing the first film material 10 is that 100 ℃, fusing point are 135 ℃, and then the heat-sealing temperature scope is 100 ℃-145 ℃.In other embodiment, also may exist the second film material 20 or tertiary membrane material 30 to have simultaneously higher vitrification point and fusing point, or the first film material 10, the second film material 20 and tertiary membrane material 30 one of them have higher fusing point, wherein another has the situation than high glass transition temperature, and heat-sealing temperature then is still to be higher than this than high glass transition temperature and is lower than this higher melt+10 ℃ to be determined.Therefore, the described method that connects the first film material 10 and the second film material 20 with tertiary membrane material 30 of present embodiment compares the first film material 10 shown in Figure 1 and the second film material 20 direct-connected methods have better Practical Performance, especially at the fusing point of the first film material 10 and the second film material 20 not simultaneously, select the tertiary membrane material 30 of a kind of fusing point between the first film material 10 and the second film material 20, can be so that the first film material 10 be more firm with being connected of the second film material 20.
205: cooling junctional membrane material is to room temperature.
After step 205 was finished, heat sealing machine 2 left the position between the roll 3 of unreeling shaft 1 and cold stretch machine, to avoid hindering the subsequent production of the first film material 10 and the second film material 20.
206: cold stretch the second film material 20.
207: successively hot-stretch and heat setting the first film material 10 and the second film material 20.
Please refer to Fig. 5, Fig. 5 is the flow chart that wet method of the present invention prepares a preferred embodiment of microporous barrier.The concrete steps that wet method of the present invention prepares microporous barrier are as follows:
301: macromolecular material and solvent are mixing.
302: film extrusion the first film material 10 and the second film material 20.
303: the end of reel of stacked the first film material 10 is first in the volume of the second film material 20.
304: seal the film at stacked place, form the junctional membrane material.
305: cooling junctional membrane material is to room temperature.
Implementation method and the change in location of equipment of step 303 to step 305 and step 103 to step 105 is basic identical, and namely the definite etc. of stacked, the hot-press sealed of the first film material 10 and the second film material 20, sealing temperature follows same procedure with previous embodiment.Difference is that present embodiment is the method that wet method prepares microporous barrier, and different when employed equipment and dry process, please referring to Fig. 1, present embodiment still describes this enforcement with Fig. 1.The present embodiment device therefor is all known wet method and prepares the used equipment of microporous barrier, be that roll 3 prepares microporous barrier uniaxial tension commonly used or biaxial stretch-formed roll with stretching-machine for known wet method, unreeling shaft 1 also is to adopt known equipment, and heat sealing machine 2 is then identical with heat sealing machine in above-described embodiment.Another difference is that the first film material 10 is different than previous embodiment from the second film material 20 residing state when connecing film.When carrying out step 304, the front end coiled strip of the first film material 10 is in uniaxial tension or biaxial stretch-formed step, and the second film material 20 has then been finished the pending uniaxial tension of film extrusion step or biaxial stretch-formed.Behind above-mentioned steps formation junctional membrane material, again the first film material 10 and the second film material 20 are carried out the subsequent step that wet method prepares.
306: single shaft or biaxial stretch-formed the second film material 20.
307: successively solvent extraction and dry the first film material 10 and the second film material 20.
Fig. 6 is the flow chart that wet method of the present invention prepares another preferred embodiment of microporous barrier.The flow process of present embodiment and flow process shown in Figure 5 are basic identical, and difference is also to have introduced one section tertiary membrane material 30 when the first film material 10 is connected with the second film material 20.Please be simultaneously with reference to Fig. 3 A and Fig. 3 B, unreeling shaft 1, stretching-machine roll 3 are all known wet method and prepare the used equipment of microporous barrier shown in Fig. 3 A and Fig. 3 B at this moment, and 2 of heat sealing machines are identical with the used heat sealing machine of above-described embodiment.The present embodiment concrete steps are as follows:
401: macromolecular material and solvent are mixing.
402: film extrusion the first film material 10 and the second film material 20.
403: stacked one section tertiary membrane material 30 is on the volume head of the end of reel of the first film material 10 and the second film material 20.
404: seal the first film material 10 and the stacked place of tertiary membrane material 30 and the stacked place of the second film material 20 and tertiary membrane material 30.
405: cooling junctional membrane material is to room temperature.
406: single shaft or biaxial stretch-formed the second film material 20.
407: successively solvent extraction and dry the first film material 10 and the second film material 20.
In sum, method for producing microporous barrier provided by the invention engages by the first film material 10 is directly sealed with the second film material 20, or by tertiary membrane material 30 the first film material 10 is connected with the second film material 20, realize the continuous production of change of lap process in the microporous barrier production, improved stability and the production efficiency of processing procedure.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that the embodiment that has disclosed does not limit the scope of the invention.On the contrary, the change of doing without departing from the spirit and scope of the present invention and retouching all belong to scope of patent protection of the present invention.
Claims (10)
1. a method for producing microporous barrier is used for the continuous production of the first film material and the second film material, it is characterized in that the method comprises:
Steps A. this first film material of film extrusion and this second film material;
Step B. connects this first film material and this second film material forms the junctional membrane material;
Step C. this second film material that stretches.
2. method for producing microporous barrier as claimed in claim 1 is characterized in that the method specifically comprises in step B:
The end of reel of stacked this first film material of step D. is first in the volume of this second film material;
Step e. seal the stacked place of this first film material and this second film material.
3. method for producing microporous barrier as claimed in claim 1 is characterized in that the method specifically comprises in step B:
Step F. stacked one section tertiary membrane material is in the end of reel of this first film material and the volume head of this second film material;
Step G. seals the stacked place of this first film material and this tertiary membrane material and the stacked place of this second film material and this tertiary membrane material.
4. method for producing microporous barrier as claimed in claim 1 is characterized in that the method comprises that also this junctional membrane material of cooling is to room temperature behind step B.
5. method for producing microporous barrier as claimed in claim 1, the method is the dry type preparation method, it is characterized in that the method also comprises this first film material of heat treatment and this second film material before step B; Step C is described to be stretched as cold stretch.
6. method for producing microporous barrier as claimed in claim 5 is characterized in that this first film material is in stretching step, and this second film material has been finished the pending stretching step of heat treatment step.
7. method for producing microporous barrier as claimed in claim 1, the method is the wet type preparation method, it is characterized in that the described uniaxial tension or biaxial stretch-formed that is stretched as of step C.
8. method for producing microporous barrier as claimed in claim 7 is characterized in that this first film material is in stretching step, and this second film material has been finished the pending stretching step of film extrusion step.
9. a microporous barrier production equipment is characterized in that this equipment comprises heat sealing machine.
10. microporous barrier production equipment as claimed in claim 9, this equipment comprises stretching-machine, is provided with unreeling shaft before this stretching-machine, and when it is characterized in that connecing film, this heat sealing machine is arranged between unreeling shaft and this stretching-machine; When connecing the film end, this heat sealing machine leaves the position between this unreeling shaft and this stretching-machine.
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| CN2012103699714A CN102881852A (en) | 2012-09-28 | 2012-09-28 | Method and device for manufacturing microporous films |
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| CN2012103699714A CN102881852A (en) | 2012-09-28 | 2012-09-28 | Method and device for manufacturing microporous films |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106920911A (en) * | 2014-10-10 | 2017-07-04 | 住友化学株式会社 | The battery manufacture method and manufacture device of separator winding body |
| CN114368634A (en) * | 2021-12-17 | 2022-04-19 | 南京三英软件有限公司 | Separator roll changing connection method for storage battery separator conveying line |
| WO2023241194A1 (en) * | 2022-06-17 | 2023-12-21 | 宁德时代新能源科技股份有限公司 | Separation membrane roll, electrode assembly, battery cell, battery and electric apparatus |
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| WO2023241194A1 (en) * | 2022-06-17 | 2023-12-21 | 宁德时代新能源科技股份有限公司 | Separation membrane roll, electrode assembly, battery cell, battery and electric apparatus |
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Application publication date: 20130116 |