CN117944252A - Length direction stretching device for preparing secondary battery separation membrane - Google Patents
Length direction stretching device for preparing secondary battery separation membrane Download PDFInfo
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- CN117944252A CN117944252A CN202211645421.0A CN202211645421A CN117944252A CN 117944252 A CN117944252 A CN 117944252A CN 202211645421 A CN202211645421 A CN 202211645421A CN 117944252 A CN117944252 A CN 117944252A
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- stretching
- separation film
- secondary battery
- roller
- steel
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- 238000000926 separation method Methods 0.000 title claims abstract description 104
- 239000012528 membrane Substances 0.000 title claims description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 230000006641 stabilisation Effects 0.000 claims description 16
- 238000011105 stabilization Methods 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 23
- 230000008569 process Effects 0.000 description 23
- 239000011148 porous material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Cell Separators (AREA)
Abstract
The present invention relates to a longitudinal stretching apparatus for producing a secondary battery separator by stretching a separator film in the longitudinal direction by using a speed difference between rolls. For this purpose, a lengthwise stretching apparatus for preparing a secondary battery separation film includes: a preheating part, wherein a compression roller connected with an air cylinder is arranged at one side of a steel roller in the chamber, and the compression roller preheats the separation film passing through the steel roller by pressing the separation film; a stretching part, wherein the compression roller is obliquely arranged by taking the center line of the vertical direction of the steel roller as a reference to press the separation film; and a heat fixing portion disposed adjacent to the stretching portion, wherein a pressing roller is disposed on one side of the steel roller, and the pressing roller maintains a stretched state by pressing the separation film to fix a temperature of the separation film passing through the steel roller.
Description
Technical Field
The present invention relates to a longitudinal stretching apparatus for producing a secondary battery separation film.
Background
In general, in the process of preparing a secondary battery separator, a dry separator process of forming pores by stretching an extruded PP film or a wet separator process of forming pores by extruding a PE film using a solvent is used.
In the case of the dry separation membrane process, the pores are formed by mechanical force, so that it is difficult to form uniform pores.
In the case of the wet separation membrane process, the wet separation membrane process has advantages such as excellent mechanical strength, uniform pore formation, and process stability, which are advantageous for the electronic device for maintaining the rated output and long-term battery performance, but has disadvantages such as high process cost and low thermal stability.
The wet separation membrane production process includes a raw material extrusion process for mixing oil (wax) for forming pores, a Casting post-longitudinal stretching (MDO) process, a primary transverse stretching (TDO, 1 st) process, an oil (wax) extraction process, and a secondary transverse stretching (TDO, 2 st) process.
In this case, when the shape of the air hole is a uniform circular shape and has a uniform size, the passage of ions is smooth, so that a battery having high reliability can be produced. However, although the separation membrane production process is generally subjected to a longitudinal stretching process after casting, a transverse stretching process, and a post-extraction heat setting process, the separation membrane film is contracted in the oil extraction process, and in this process, the pore shape of the film is formed into an oval shape. This causes a problem of lowering the ion electrical efficiency because ions hardly pass through.
Therefore, in order to secure the reliability of the separation membrane, uniform stretching, process design to optimize the stretching ratio, minimization of heat shrinkage, formation of pores by the heat process, and securing mechanical strength are required in the stretching process.
However, the existing separation film production apparatus is composed of an MD (longitudinal direction) stretching apparatus and a TD (transverse direction) stretching apparatus, and exhibits a nonlinear stretching result due to stress when producing a separation film, so that an operation of correcting this is required, and there is also a problem that the quality of the separation film is lowered.
Prior art literature
Patent literature
Patent document 1: korean patent publication No. 10-1858566 (title of invention: preparation method and apparatus for separation film of secondary battery, published on 2018, 01, 04)
Patent document 2: korean patent publication No. 10.1561971 (title of invention: preparation System of separation film for Secondary Battery, published on 14 th month of 2015)
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a longitudinal stretching apparatus for producing a secondary battery separation film as follows: the stretching of the separation membrane film in the longitudinal direction is performed by using the speed difference between the rolls while stably maintaining the tension of the separation membrane film, so that the stretching can be more effectively performed.
According to a preferred embodiment for achieving the above object of the present invention, a lengthwise stretching apparatus for preparing a secondary battery separation film of the present invention may comprise: a preheating part for heating the separation film passing through the plurality of steel rollers in the chamber, wherein a press roller connected with the air cylinder is arranged at one side of the steel rollers, and the press roller preheats the separation film passing through the steel rollers by pressing the separation film; a stretching section for stretching the preheated separation membrane film in the longitudinal direction while passing through a plurality of steel rolls, wherein the press rolls are arranged obliquely with respect to the center line of the steel rolls in the vertical direction so as to press the separation membrane film; and a heat fixing portion disposed adjacent to the stretching portion, wherein a pressing roller is disposed on one side of the steel roller, and the pressing roller presses the separation film to fix a temperature of the separation film passing through the steel roller, thereby maintaining a stretched state.
The present invention may further include a movable bogie provided at an upper portion of the chamber, for maintaining and repairing the apparatus by moving with the upper frame.
In the present invention, a stabilization zone may be provided between the stretching section and the heat-setting section to stabilize the stretched separation membrane film.
The thermal fixing portion is provided so as to be movable to one side, and the stabilization zone is changed by movement of the thermal fixing portion.
The preheating part may include a scraper which contacts the steel roller to remove oil from the surface of the steel roller.
The scraper may include: a blade which is in direct contact with the surface of the steel roller to scrape off oil; a movable shaft for fixedly arranging the blade; and a working cylinder connected to the moving shaft, for causing the blade to contact with or separate from the steel roller by raising or lowering the moving shaft.
The tension detecting portion may be provided at both ends of the pressing roller of the stretching portion to detect inclination of the pressing roller.
The tension detecting section may be connected to a regulating cylinder, and the position of the pressure roller may be regulated by operating the regulating cylinder by a signal of a pressure regulating valve.
The heat fixing part may lengthen a distance from the stretching part by moving a lower bottom plate along an LM Guide (LM Guide), thereby elongating the stabilizing section.
The invention can be provided with a door frame at the lower part of the movable bogie, and a door which can enable operators to enter the equipment can be arranged at the door frame.
According to the lengthwise stretching device for manufacturing a separation film for a secondary battery of the present invention, the separation film can be more effectively stretched by lengthwise stretching of the separation film using a speed difference between rolls, and the quality of the produced separation film can be improved by stably maintaining the tension of the separation film subjected to the stretching process.
Further, the stabilization zone of the separation membrane film is provided for stabilization of the separation membrane film after stretching, and stabilization of the separation membrane preparation process can be achieved by inducing natural shrinkage of the separation membrane film.
Further, the operator can safely enter the longitudinal stretching device to maintain and repair the device, and thus the workability can be improved while protecting the operator.
Drawings
Fig. 1 is a view showing a longitudinal stretching apparatus for preparing a secondary battery separation film according to an embodiment of the present invention.
Fig. 2 is a view showing an oil scraper of a preheating part according to an embodiment of the present invention.
Fig. 3 is a view showing an arrangement state of a pressing roller of a longitudinal stretching apparatus according to an embodiment of the present invention.
Fig. 4 is a diagram showing a tension detecting section of a roller of a longitudinal stretching apparatus according to an embodiment of the present invention.
Fig. 5 is a view showing a heat fixing portion of a longitudinal stretching apparatus according to an embodiment of the present invention.
Fig. 6 is a diagram showing a mobile bogie of a longitudinal stretching apparatus according to an embodiment of the present invention.
Description of the reference numerals
1: Stretching device 2: chamber chamber
2A: upper frame 10: preheating part
11: Steel roller 12: compression roller
12A: the cylinder 13: scraping device
13A: blade 13b: movable shaft
13C: working cylinder 20: stretching part
21: Steel roller 22: compression roller
22A: adjusting cylinder 23: tension detecting part
24: Pressure regulating valve 30: thermal fixing part
31: Steel roller 32: compression roller
33: The bottom plate 34: LM guide rail
35: The moving unit 40: movable bogie
40A: bogie frame 40b: door frame
41: Guide rail 42: mobile handle
43: Door
F: separation membrane film
SZ: stabilization interval
Detailed Description
An embodiment of a longitudinal stretching apparatus for producing a secondary battery separation film according to the present invention is described below with reference to the drawings. In this case, the present invention is not limited to or by the embodiments. In describing the present invention, descriptions of well-known functions and configurations will be omitted so as to not obscure the gist of the present invention.
Fig. 1 is a view showing a longitudinal stretching apparatus for preparing a separation film of a secondary battery according to an embodiment of the present invention, and fig. 2 is a view showing an oil scraper of a preheating part according to an embodiment of the present invention.
Referring to fig. 1 and 2, a longitudinal stretching apparatus 1 for preparing a separation film of a secondary battery according to the present invention includes a preheating part 10, a stretching part 20, a heat fixing part 30, and a movable bogie 40, and stretches a separation film F passing through the stretching apparatus 1 in the longitudinal direction.
In the present embodiment, the preheating unit 10 of the stretching apparatus 1 includes the following sections: the separation film F passing through the plurality of steel rolls 11 is heated in the chamber 2, and a press roll 12 connected to a cylinder 12a is disposed on one side of the steel rolls 11, and the press roll 12 preheats the separation film F passing through the steel rolls 11 by pressing the separation film F.
The stretching unit 20 is provided with the following sections: the preheated separation film F is stretched in the longitudinal direction while passing through the plurality of steel rolls 21, and the press rolls 22 are arranged obliquely with respect to the vertical center line of the steel rolls 21 to press the separation film F.
The thermal fixing unit 30 is configured as follows: a press roll 32 is disposed adjacent to the stretching section 20 on one side of the steel roll 31, and the press roll 32 presses the separation film F to fix the temperature of the separation film F passing through the steel roll 31, thereby maintaining the stretched state.
The movable bogie 40 provided at the upper portion of the chamber 2 of the stretching apparatus 1 is moved along with the upper frame 2a to maintain and repair equipment, and an operator can perform a desired operation of the stretching apparatus 1 after moving the movable bogie 40 to the upper portion of the stretching apparatus 1 and entering the chamber 2.
That is, the stretching apparatus 1 stretches the separation film F in the longitudinal direction by using the speed difference between the rolls, and the separation film F becomes thinner and narrower in width as the separation film F is stretched in the longitudinal direction.
The press rolls 12, 22, 32 of the stretching apparatus 1 described above are in contact with the steel rolls 11, 21, 31 in an inclined state, and the separation film F passing through the steel rolls 11, 21, 31 can be made to have an appropriate tension by stably pressing the separation film F, and can be effectively stretched in this manner.
In the present embodiment, a stabilization zone SZ is provided between the stretching unit 20 and the heat fixing unit 30 of the stretching apparatus 1, so that the stretched separation film F can be stabilized, the heat fixing unit 30 is provided so as to be movable to one side, and the stabilization zone SZ can be changed by the movement of the heat fixing unit 30.
The preheating section 10 of the stretching apparatus 1 includes a scraper 13, which is in contact with the steel roller 11 to remove oil from the surface of the steel roller 11, and the scraper 13 includes: a blade 13a which is in direct contact with the surface of the steel roller 11 to scrape off oil; a movable shaft 13b for fixedly disposing the blade 13a; and a working cylinder 13c connected to the movable shaft 13b, for bringing the blade 13a into contact with or out of contact with the steel roller 11 by raising or lowering the movable shaft 13 b.
The amount of oil removed from the steel roll 11 can be adjusted by adjusting the position where the blade 13a contacts the steel roll 11. When the blade 13a is brought into close contact with the steel roller 11, a larger amount of oil can be removed, and when the blade 13a is brought into contact with the steel roller 11 with an appropriate force, an appropriate amount of oil can be removed.
That is, since the separation membrane film F is put in an unshaped state during the process of putting it into the stretching apparatus 1, the oil adhering to the surface of the separation membrane film F is excessively applied to the steel roll 11, and the scraper 13 is provided at a position adjacent to the steel roll 11 in order to remove the oil.
The scraper is provided on three steel rolls 11 arranged at the initial position where the separation membrane film F is placed in the stretching apparatus 1, and the oil applied to the three steel rolls 11 is preferentially removed, so that the amount of oil applied to the separation membrane film F passing through the remaining steel rolls 11, 21, 31 is appropriately maintained, and the quality of the produced separation membrane film F can be improved.
Fig. 3 is a diagram showing a state of installation of a pressing roller of the longitudinal stretching device according to an embodiment of the present invention, and fig. 4 is a diagram showing a tension detecting portion of the roller of the longitudinal stretching device according to an embodiment of the present invention.
Referring to fig. 3 and 4, the stretching unit 20 of the stretching apparatus 1 presses the separation film F by disposing the pressing roller 22 obliquely with respect to the vertical center line of the steel roller 21, and the pressing roller 22 of the stretching unit 20 is disposed at a point where the separation film F and the steel roller 21 meet at the earliest with an angle (θ) ranging from 35 ° to 45 ° with respect to the vertical center line of the steel roller 21. .
Preferably, the press roller 22 is inclined at an angle of 40 ° with respect to the vertical center line of the steel roller 21.
In this way, the pressure roller 22 uniformly presses the separation film F, so that the separation film F can be stably stretched, and breakage of the separation film F, which may occur during the stretching of the separation film F, can be prevented.
The tension detecting portions 23 are provided at both ends of the pressure roller 22 of the stretching portion 20 to sense the inclination of the pressure roller 22, and the tension detecting portions 23 are connected to the adjusting cylinder 22a, and the adjusting cylinder 22a is operated by a signal of the pressure adjusting valve 24 to adjust the position of the pressure roller 22.
That is, in the stretching process of the separation film F, since the pressing roller 22 pressing the separation film F may be inclined to one side, the inclination of the pressing roller 22 is sensed by the tension sensing part 23 to maintain the level of the pressing roller 22.
The pressure regulating valve 24 is operated by sensing a signal of the inclined tension detecting part 23 of the pressing roll 22, and the regulating cylinder 22a is operated by the operation of the pressure regulating valve 24, so that the pressing roll 22 is maintained horizontally, and in this way, the pressing roll 22 uniformly presses the separation membrane film F.
Fig. 5 is a view showing a heat fixing portion of a longitudinal stretching apparatus according to an embodiment of the present invention.
Referring to fig. 5, the heat fixing part 30 of the stretching apparatus 1 moves along the LM guide 34 by the lower bottom plate 33 to lengthen the distance from the stretching part 20, thereby elongating the stabilization zone SZ of the separation film F.
The bottom plate 33 is connected to a moving unit 35, and can be moved along the LM guide 34 by the operation of the moving unit 35. The heat fixing portion 30 can be moved by about 550mm by the above-mentioned moving portion 35, and therefore the stabilization zone SZ of the separation membrane film F can be further obtained.
The stabilization zone SZ may give a time for naturally shrinking the separation membrane film F after the longitudinal stretching (MDO) and before the transverse stretching (TDO) of the separation membrane film F.
Fig. 6 is a diagram showing a mobile bogie of a longitudinal stretching apparatus according to an embodiment of the present invention.
Referring to fig. 6, the movable bogie 40 of the stretching apparatus 1 is provided so as to be movable along a guide rail 41 provided in the upper frame 2a of the chamber 2, a movable handle 42 is connected to the movable bogie 40 in a direction perpendicular to the guide rail 41, and the movable handle 42 is operated to move the movable bogie 40.
A door frame 40b is provided at a lower portion of the bogie frame 40a of the movable bogie 40, and a door 43 for allowing an operator to enter the facility is provided at the door frame 40 b.
After the movable bogie 40 is moved to a position where maintenance and repair of the stretching apparatus 1 are required, an operator enters the inside of the chamber 2 of the stretching apparatus 1 with the door 43 of the movable bogie 40 opened, and performs maintenance and repair work.
Accordingly, the above-described longitudinal stretching apparatus 1 for producing a separation film for a secondary battery can more effectively stretch the separation film by performing longitudinal stretching of the separation film F using a speed difference between rolls, and can improve the quality of the produced separation film by maintaining the tension of the separation film F subjected to the stretching process.
The stabilization zone SZ of the separation membrane film F is provided for stabilization of the separation membrane film F after stretching, and stabilization of the separation membrane preparation process can be achieved by inducing natural shrinkage of the separation membrane film F.
Further, the operator can safely enter the longitudinal stretching device 1 to maintain and repair the device, and thus the workability can be improved while protecting the operator.
While the invention has been shown and described with reference to the preferred embodiments for illustrating the principles of the invention, the structure and operation of the invention are not limited to those shown and described. It will be appreciated by those skilled in the art that various changes and modifications can be made in the invention without departing from the spirit and scope of the appended claims.
Claims (10)
1. A lengthwise stretching apparatus for producing a secondary battery separation film, comprising:
A preheating part for heating the separation film passing through the plurality of steel rollers in the chamber, wherein a press roller connected with the air cylinder is arranged at one side of the steel rollers, and the press roller preheats the separation film passing through the steel rollers by pressing the separation film;
A stretching section for stretching the preheated separation membrane film in the longitudinal direction while passing through a plurality of steel rolls, wherein the press rolls are arranged obliquely with respect to the center line of the steel rolls in the vertical direction so as to press the separation membrane film; and
And a heat fixing portion disposed adjacent to the stretching portion, wherein a pressing roller is disposed on one side of the steel roller, and the pressing roller presses the separation film to fix a temperature of the separation film passing through the steel roller, thereby maintaining a stretched state.
2. The longitudinal stretching apparatus for preparing a separation membrane of a secondary battery according to claim 1, further comprising a movable bogie provided at an upper portion of the chamber, for maintaining and repairing equipment by moving with an upper frame.
3. The longitudinal stretching device for producing a secondary battery separator according to claim 1, wherein a stabilization zone is provided between the stretching portion and the heat fixing portion to stabilize the stretched separator film.
4. The longitudinal stretching device for producing a secondary battery separation film according to claim 3, wherein the heat fixing portion is provided so as to be movable to one side, and the stabilization zone is changed by movement of the heat fixing portion.
5. The longitudinal stretching apparatus for preparing a separation membrane for a secondary battery according to claim 1, wherein the preheating part comprises a scraper, which is contacted with the steel roll to remove oil from the surface of the steel roll.
6. The longitudinal stretching apparatus for preparing a separation film for a secondary battery according to claim 5, wherein the scraper comprises:
a blade which is in direct contact with the surface of the steel roller to scrape off oil;
a movable shaft for fixedly arranging the blade; and
And a working cylinder connected to the moving shaft, for moving the moving shaft up or down to contact or separate the blade with or from the steel roller.
7. The longitudinal stretching device for preparing a secondary battery separation film according to claim 1, wherein the pressing rolls of the stretching part are respectively provided with tension detecting parts at both ends to sense the inclination of the pressing rolls.
8. The longitudinal stretching apparatus for preparing a separation membrane of a secondary battery according to claim 7, wherein the tension detecting part is connected to a regulating cylinder, and the position of the pressing roller is regulated by operating the regulating cylinder by a signal of a pressure regulating valve.
9. The longitudinal stretching device for preparing a secondary battery separation film according to claim 4, wherein the heat fixing part stretches a distance from the stretching part by moving a lower bottom plate along an LM guide, thereby stretching the stabilizing section.
10. The longitudinal stretching apparatus for preparing a separation film for a secondary battery according to claim 2, wherein a door frame is provided at a lower portion of the movable bogie, and a door for allowing an operator to enter the apparatus is provided at the door frame.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020220135535A KR102615777B1 (en) | 2022-10-20 | 2022-10-20 | Machine direction orientation of stretching apparatus for manufacturing secondary battery separator |
| KR10-2022-0135535 | 2022-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117944252A true CN117944252A (en) | 2024-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211645421.0A Pending CN117944252A (en) | 2022-10-20 | 2022-12-16 | Length direction stretching device for preparing secondary battery separation membrane |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR102615777B1 (en) |
| CN (1) | CN117944252A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118404803A (en) * | 2024-04-29 | 2024-07-30 | 徐州屹之澜光电科技有限公司 | Stretching device for manufacturing POF matte high-shrinkage film |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2071422C (en) * | 1991-09-06 | 1996-06-25 | Jack N. Shirrell | Method for making prestretched film |
| KR0184113B1 (en) * | 1996-05-10 | 1999-04-01 | 전장열 | Bogie control method of movable working table for bridge maintaining and the apparatus therefor |
| KR100208538B1 (en) * | 1997-06-24 | 1999-07-15 | 성수경 | Extrusion and extension apparatus for film manufacturing |
| JP2009255992A (en) * | 2006-07-07 | 2009-11-05 | Hirata Corp | Carriage device |
| JP5186267B2 (en) * | 2007-04-04 | 2013-04-17 | 富士フイルム株式会社 | Cellulose acylate film and method for producing the same, polarizing plate, optical compensation film for liquid crystal display plate, antireflection film and liquid crystal display device |
| KR100908551B1 (en) * | 2007-12-10 | 2009-07-20 | 구승회 | Sheet forming machine |
| US9315007B2 (en) * | 2013-01-23 | 2016-04-19 | Fives Machining Systems, Inc. | Composites system with dockable heads |
| KR101561971B1 (en) | 2013-10-04 | 2015-10-20 | 주식회사 엘지화학 | System for manufacturing separator film for secondary battery |
| KR20160116702A (en) * | 2015-03-31 | 2016-10-10 | 코오롱인더스트리 주식회사 | Polyester and manufacturing method thereof |
| KR101858566B1 (en) | 2016-06-27 | 2018-06-28 | (주)피엔티 | Method and apparatus for manufacturing separator of secondary battery |
| KR102145363B1 (en) * | 2019-08-26 | 2020-08-19 | 정효연 | A tension control device for conveying excess vinyl fabric in vinyl fabric manufacturing equipment |
| KR102313792B1 (en) * | 2020-05-19 | 2021-10-15 | 윤중식 | Casting device used in manufacturing separator of secondary battery |
-
2022
- 2022-10-20 KR KR1020220135535A patent/KR102615777B1/en active IP Right Grant
- 2022-12-16 CN CN202211645421.0A patent/CN117944252A/en active Pending
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| KR102615777B1 (en) | 2023-12-19 |
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