KR102313792B1 - Casting device used in manufacturing separator of secondary battery - Google Patents

Abstract

The present invention provides a casting device for manufacturing a separator of a secondary battery used when manufacturing a separator of a secondary battery with a raw material containing a synthetic resin and a diluent and comprises: a T-die for forming an extruded raw material in the form of a sheet; a cooling roll provided under the T-die so as to receive and rotate the sheet-shaped raw material in the T-die alone; a pinch roll positioned adjacent to the cooling roll to form a gap through which the sheet-shaped raw material, which is placed on the cooling roll and moves, passes upward while being pressurized and supporting the sheet-shaped raw material passing through the gap; and a diluent removing means for a cooling roll provided to remove a diluent from a surface of the cooling roll separated from the sheet-shaped raw material. Accordingly, the cooling efficiency of the pinch roll does not decrease.

Description

Casting device for manufacturing separator of secondary battery {CASTING DEVICE USED IN MANUFACTURING SEPARATOR OF SECONDARY BATTERY}

The present invention relates to a casting apparatus, and more particularly, to a casting apparatus for use in a casting step of a separator manufacturing process of a secondary battery.

A secondary battery is a rechargeable battery, unlike a primary battery, and is used in batteries of various devices such as cell phones, notebook computers, camcorders, and automobiles. In general, such a secondary battery has a structure in which electrodes (anode, anode) and a separator are alternately stacked, and in order to manufacture a secondary battery, an electrode and a separator must first be manufactured.

A separator manufacturing process for a secondary battery is generally disclosed in Patent Publication No. 10-2014-0062692 (Method for Manufacturing Separator and Separator and Battery Using Same) and Patent Registration No. 10-1914249 (Method for Manufacturing Separator for Secondary Battery) As such, it includes an extrusion step, a casting step, a stretching step, an extraction/drying step, and a heat setting/winding step.

In the extrusion step, a raw material mixed with a synthetic resin and a diluent is heated and pressurized by an extruder and extruded. Polyolefin resins such as polyethylene and polypropylene are mainly used as the synthetic resins, and oils such as mineral oil and paraffin oil are mainly used as diluents.

In the casting step, the raw material that has passed through the extrusion step is formed in the form of a sheet by a casting device. The above casting device includes a T-die, a cooling roll, and the like. The raw material that has undergone the extrusion step is first in the form of a gel-like sheet through the T-die and is supplied between the pinch roll and the cooling roll, and then placed on the cooling roll and moved while moving. It is passed between the cooling roll and another pinch roll.

In the stretching step, the sheet formed in the casting step is stretched in the machine direction (Machine Direction, MD) and the transverse direction (Transverse Dircection, TD). And in the extraction/drying step, the sheet that has undergone the stretching step is immersed in an organic solvent and then dried. Then, the diluent is extracted in the immersion process to form a porous membrane. In the heat setting/winding step, the porous membrane formed in the extraction/drying step is again stretched in the transverse direction and then wound on a winding roll. What is wound on the winding roll is a porous separator used as a separator for secondary batteries.

Laid-Open Patent Publication No. 10-2014-0062692 (Method for manufacturing separator and separator and battery using same) Registered Patent No. 10-1914249 (Method for manufacturing separator for secondary battery)

In the casting step of the secondary battery separator manufacturing process, as described above, the gel-like sheet supplied from the T-die passes between the cooling roll and the pinch roll twice. Since the diluent is included, there is a problem in that the diluent of the oil type accumulates between the cooling roll and the pinch roll, particularly between the cooling roll and the second pinch roll.

Accordingly, an object of the present invention is to provide a casting apparatus for manufacturing a separator of a secondary battery capable of solving the problem of accumulation of oil diluents.

The present invention provides a casting apparatus for manufacturing a separator for a secondary battery used when manufacturing a separator for a secondary battery with a raw material including a synthetic resin and a diluent, comprising: a T-die for forming the extruded raw material in a sheet form; a cooling roll provided under the T-die so as to receive and rotate the raw material in the form of a sheet formed in the T-die; a pinch roll positioned adjacent to the cooling roll to form a gap through which the sheet-shaped raw material, which is placed on the cooling roll and moves, passes upward while being pressed, supporting the sheet-shaped raw material passing through the gap; and a diluent removing means for the cooling roll provided to remove the diluent from the surface of the cooling roll separated from the sheet-shaped raw material.

The diluent removing means for the cooling roll may include: a scraper having a scraping blade which is buried on the surface of the cooling roll and scrapes the diluent approaching from the gap upward; a suction nozzle having a suction slit having an inlet near an end of the scraping blade abutting the cooling roll surface; and an inhaler that applies a suction force to the suction nozzle so that the diluent scraped off by the scraping blade can be sucked into the suction slit.

A suction path communicating with the suction slit is provided in the suction nozzle parallel to the suction slit. One end of the opposite ends of the suction passage is blocked, and the other end is connected to the inhaler.

On the other hand, the pinch roll is composed of a cooling roll, and a diluent removing means for the pinch roll for removing the diluent from the surface of the pinch roll separated from the sheet-form raw material is provided under the pinch roll.

The diluent removal means for the pinch rolls may include: a suction nozzle having a suction slit having an inlet near the surface of the pinch roll; and an inhaler that applies a suction force to the suction nozzle so that the diluent attached to the surface of the pinch roll can be sucked into the suction slit.

According to the present invention, the surface of the cooling roll on which the raw material in the form of a sheet discharged from the T-die is placed is always maintained in a state in which the diluent is removed. does not occur

In addition, according to the present invention, since the cooling roll receives the raw material in the form of a sheet discharged from the T-die alone, the surface of the raw material in the form of a sheet after passing through the gap between the cooling roll and the pinch roll can be formed flat. have.

In addition, according to the present invention, the surface of the pinch roll composed of the cooling roll is also always maintained in a state in which the diluent is removed, so that the cooling efficiency of the pinch roll is not reduced.

1 schematically shows a casting apparatus for manufacturing a separator for a secondary battery according to the present invention, mainly in its main configuration.
FIG. 2 is an enlarged cross-sectional view illustrating part A of FIG. 1 .
3 is an enlarged cross-sectional view illustrating a portion B of FIG. 1 .
4 is a plan view illustrating the casting apparatus of FIG. 1 in a state in which the T-die and the suction nozzle are excluded.
5 is a bottom view showing the suction nozzle of the casting apparatus shown in FIG.
FIG. 6 is a main configuration of a support member for supporting both ends of the scraper and the suction nozzle shown in FIG. 1 .

Hereinafter, preferred embodiments of a casting apparatus for manufacturing a separator for a secondary battery according to the present invention will be described in detail with reference to the drawings. The terms or words used below should not be construed as being limited to conventional or dictionary meanings, and on the basis of the principle that the inventor can appropriately define the concept of a term to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention.

The casting apparatus 100 for manufacturing a separator for a secondary battery according to the present invention is used when manufacturing a separator for a secondary battery using a raw material including a synthetic resin and a diluent. As the synthetic resin, polyolefin-based resins such as polyethylene and polypropylene may be mainly used, and other known resins may also be used. Oils such as mineral oil and paraffin oil may be used as the diluent.

The casting apparatus 100 includes a T-die 110 , a cooling roll 120 , a pinch roll 130 , and diluent removal means 140 , 150 , 170 for a cooling roll as shown in FIG. 1 . Hereinafter, the above configurations of the casting apparatus 100 will be described in detail, but for convenience of explanation and ease of understanding, the left and right sides in FIG. The description will be based on the example of the set direction.

The T-die 110 forms the raw material extruded by the extruder (not shown) in the form of a sheet 10 and discharges it downward. The T-die 110 is provided in a posture extending from side to side, and is installed in a frame (not shown) constituting the overall frame of the casting and casting apparatus 100 .

The cooling roll 120 has left and right ends rotatably coupled to the frame (not shown), and thus can rotate about an axis extending in the left and right directions. In addition, the cooling roll 120 is provided under the T-die 110 so as to rotate by receiving the raw material 10 in the form of a sheet formed in the T-die 110 alone.

Here, to receive the raw material 10 in the form of a sheet alone means that the raw material 10 in the form of a sheet discharged from the T-die 110 is placed on the surface of the cooling roll 120 . 1 as an example, the raw material 10 in the form of a sheet discharged from the T-die 110 is placed on the surface of the cooling roll 120 at a point located between approximately 10 o'clock and 12 o'clock.

In Laid-Open Patent Publication No. 10-2014-0062692 (Method for Manufacturing Separator and Separator and Battery Using Same), which was previously introduced as a prior art, a cooling roll and a pinch roll in which sheet-type raw materials discharged from T-die are adjacent to each other. As it flows through the gap, the cooling roll does not receive the raw material in the form of a sheet discharged from the T-die. However, in the present invention, since the cooling roll 120 receives the raw material 10 in the form of a sheet discharged from the T-die 110 alone, the pinch roll is not provided at the rear of the cooling roll 120 .

The pinch roll 130 has left and right ends rotatably coupled to the frame (not shown). Accordingly, the pinch roll 130 may rotate about an axis extending in the left and right directions. In addition, the pinch roll 130 is positioned in front of the cooling roll 120 so that a gap (G, see FIG. 4 ) is formed between the cooling roll 120 and the pinch roll 130 . The sheet-shaped raw material 10 placed on the cooling roll 120 and moving is pressed while passing through the upper gap G upward. The raw material 10 in the form of a sheet passing through the gap G proceeds while being supported by the pinch roll 130 , and is separated from the surface of the cooling roll 120 .

In the casting apparatus 100 described above, the raw material 10 in the form of a sheet discharged from the T-die 110 is placed on the surface of the rotating cooling roll 120 and moved, passes through the gap G, and then passes through the pinch roll 130 ) is supported by And the raw material 10 in the form of a sheet out of the pinch roll 130 is subjected to subsequent steps (stretching step, extraction/drying step, heat setting/winding step) necessary for manufacturing the secondary battery separator.

At this time, since the raw material 10 in the form of a sheet contains an oil-based diluent, a phenomenon in which the diluent is continuously deposited on the surface of the cooling roll 120 and a phenomenon in which the diluent is accumulated in the upper portion of the gap G occur. , if this phenomenon is left as it is, an oil film is formed and hardened on the surface of the cooling roll 120 , and then the cooling efficiency of the cooling roll 120 is remarkably reduced and the raw material 10 in the form of a sheet cannot be cooled well. do. Therefore, in the present invention, by removing the diluent from the surface of the cooling roll separated from the raw material 10 in the form of a sheet through the diluent removing means 140, 150, and 170 for the cooling roll, a decrease in the cooling efficiency of the cooling roll 120 is prevented.

The diluent removing means 140, 150, 170 for the cooling roll includes a scraper 140, and the scraper 140 includes a scraping blade 142 and a scraping body (as shown in FIGS. 2 and 4). 144).

The scraping blade 142 is provided to extend in the left and right direction, and is provided to have a left and right width slightly longer than the left and right width of the cooling roll 120 . And the tip of the scraping blade 142 is in contact with the surface of the cooling roll within the section between the gap G and the apex of the cooling roll 130 (the section between the 9 o'clock direction and the 12 o'clock direction in the case of FIG. 1). . In addition, the scraping blade 142 is provided to have an inclination in the form of lying on its back. This scraping blade 142 scrapes the diluent coming from the gap G upwardly by being buried on the surface of the cooling roll. On the other hand, the scraping body 144 is a member that fixedly supports the scraping blade 142 .

The diluent removing means 140 , 150 , 170 for the cooling roll also includes a suction nozzle 150 . As shown in FIG. 5 , the suction nozzle 150 is provided to extend in the left and right directions, and has a suction slit 152 on its lower surface. The suction slit 152 has a left and right width equal to or slightly longer than the left and right width of the scraping blade 142 . And the inlet of the suction slit 152 is located near the end of the scraping blade 142 as shown in FIG.

A suction path 154 extending in the left and right directions is provided inside the suction nozzle 150 , and the suction path 154 communicates with the suction slit 152 over the entire left and right sections. And one end of the left and right ends of the suction path 154 (the right end is illustrated in FIG. 5) is connected to a suction line 172, and the opposite end is blocked.

The diluent removing means 140 , 150 , 170 for the cooling roll also includes an inhaler 170 . The inhaler 170 is provided with a suction port to which the suction line 172 is coupled and a discharge port to which the discharge line 176 is coupled. A ring blower may be used as the inhaler 170 .

When the inhaler 170 is operated, suction is made in the suction line 172 and discharge is made in the discharge line 176 . Therefore, when the inhaler 170 operates, suction force is applied to the suction nozzle 150, and then the diluent scraped by the scraping blade 142 passes through the suction slit 152, the suction path 154, and the suction line 172. It is sucked through the inhaler 170 . The diluent drawn into the inhaler 170 is discharged to the diluent tank 174 via a discharge line 176 .

Due to the above-described diluent removal means 140, 150, 170 for the cooling roll, in the casting apparatus 100 according to the present invention, the surface of the cooling roll on which the raw material 10 in the form of a sheet discharged from the T-die 110 is placed is always As the diluent is maintained in the removed state, an oil film is formed on the surface of the cooling roll 120 , thereby reducing the cooling efficiency of the cooling roll 120 .

In addition, in the present invention, as described above, the cooling roll 120 receives the raw material 10 in the form of a sheet discharged from the T-die 110 alone, and the pinch roll is not provided at the rear of the cooling roll 120 . Therefore, the sheet-form raw material 10 is cooled slowly while moving to the gap G, and is cooled relatively rapidly while being pressurized when passing through the gap G. Then, the sheet-form raw material 10 is cooled while moving to the gap G. Even if a part of the oil diluent from 10) falls by gravity, the raw material 10 in sheet form after passing through the gap G because the raw material 10 in the form of a sheet passes through the gap G in a relatively less rigid state. The surface of may be formed flat.

On the other hand, as in the prior art, when the raw material 10 in the form of a sheet discharged from the T-die 110 passes directly between the cooling roll 120 and the pinch roll at the rear thereof, when this passage is made, the raw material in the form of a sheet ( 10) is cooled relatively rapidly. And even in this state, a part of the oil diluent falls by gravity from the sheet-shaped raw material 10 moving to the gap G, and the surface flatness of the sheet-shaped raw material 10 becomes poor, and this surface flatness is relatively Even after the raw material 10 in the form of a sheet, which has become more hardened, passes through the gap G, it cannot be recovered to the level in the present invention.

On the other hand, in the casting apparatus 100 according to the present invention, the raw material 10 in the form of a sheet can be cooled by the pinch roll 130 in the gap G and can be cooled even in a state supported by the pinch roll 130 . so that the pinch roll 130 is composed of a cooling roll. And in order to prevent the problem that the cooling efficiency of the pinch roll 130 is lowered because the surface of the pinch roll 130 is continuously stained with an oil diluent, in the present invention, the pinch roll separated from the raw material 10 in the form of a sheet Diluent removal means 160 and 170 for pinch rolls for removing the diluent from the surface are provided.

The diluent removing means 160 and 170 for the pinch roll includes a suction nozzle 160 . The upper suction nozzle 160 is provided under the pinch roll 130 in a posture extending in the left and right direction (an example provided between the 6 o'clock and 9 o'clock directions in FIG. 1 is shown), and a suction slit 162 on one surface. to provide The suction slit 162 has a left and right width equal to or slightly longer than the left and right width of the pinch roll 130 . And the inlet of the suction slit 162 is located near the surface of the pinch roll 130 as shown in FIG.

A suction path 164 extending in the left and right directions is provided inside the suction nozzle 160 , and the suction path 164 communicates with the suction slit 162 over the entire left and right sections. And one end of the left and right ends of the suction path 164 is connected to a suction line (not shown), and the opposite end is blocked. The suction line (not shown) is connected to the intake port of the inhaler 170 of the diluent removing means for the cooling roll. Therefore, when the inhaler 170 operates, the diluent on the surface of the pinch roll is sucked into the inhaler 170 through the suction slit 162 , the suction path 164 and the suction line (not shown).

On the other hand, the left and right ends of the scraper 140 and the suction nozzle 150 of the diluent removal device for a cooling roll are respectively supported by a pair of support members. The pair of support members are configured in the same way, and only the right support member will be described below with reference to FIG. 6 .

The support member includes a lifting block 182 , a forward and backward block 184 and a fixed block 186 .

The fixing block 186 is a block fixed to the frame (not shown), and includes a vertical plate 186a and a horizontal plate 186b fixed to the vertical plate 186a. A forward and backward cylinder 186d is fixed to the vertical plate 186a, and a forward and backward rail 186c is provided on the upper surface of the horizontal plate 186b.

The forward and backward block 184 includes a horizontal plate 184b slidably coupled to the forward and backward rail 186c, and a vertical plate 184a fixed to the horizontal plate 184b. A lifting cylinder 184d is fixed to the horizontal plate 184b, and the cylinder rod of the forward/backward cylinder 186d is coupled. Therefore, when the forward and backward cylinder 186d operates, the forward and backward block 184 and the lifting cylinder 184d move forward and backward. The upper end plate (184a) is provided with a lifting rail (184c).

The lifting block 182 includes a vertical plate 182a slidably coupled to the lifting rail 184c, and a horizontal plate 182b fixed to the vertical plate 182a. The bracket 144a of the scraping body 144 is rotatably coupled to the end plate 182a, and the bracket 150a of the suction nozzle 150 is also rotatably coupled. The operator may adjust the inclination angle of the scraper 140 and the inclination angle of the suction nozzle 150 by manually rotating the upper brackets 144a and 150a. The cylinder rod of the lifting cylinder (184d) is coupled to the upper horizontal plate (182b). Therefore, when the lifting cylinder 184d is operated, the lifting block 182, the scraper 140, and the suction nozzle 150 are simultaneously raised and lowered.

Due to the pair of support members described above, the inclination angle, the front-rear position, and the vertical position of the scraper 140 and the suction nozzle 150 can be adjusted.

On the other hand, the left and right ends of the suction nozzle 160 of the diluent removal device for pinch rolls are also supported by the pair of support members as above. have.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations can be made within the equivalent scope of the claims to be described, and the above-described embodiments can be variously combined.

100: Casting device for manufacturing separator of secondary battery
110: T-die 120: cooling roll
130: pinch roll 140: scraper
142: scraping blade 144: scraping body
150: suction nozzle 152: suction slit
154: suction path 160: suction nozzle
162: suction slit 164: suction path
170: inhaler 172: suction line
174: thinner tank 176: discharge line
182: elevating block 184: forward and backward block
186: fixed block 10: raw material in the form of a sheet

Claims (5)

As a casting device for manufacturing a separator of a secondary battery used when manufacturing a separator of a secondary battery with a raw material containing a synthetic resin and a diluent of oils,
T-die for forming the extruded raw material in the form of a sheet;
a cooling roll provided under the T-die so as to rotate while cooling the raw material in the form of a sheet formed in the T-die alone;
a pinch roll positioned adjacent to the cooling roll to form a gap through which the sheet-shaped raw material, which is placed on the cooling roll and moves, passes upward while being pressed, supporting the sheet-shaped raw material passing through the gap; and
a diluent removing means for a cooling roll provided to remove the diluent from the surface of the cooling roll separated from the raw material in the sheet form;
The diluent removal means for the cooling roll,
a scraper having a scraping blade that is buried on the surface of the cooling roll and scrapes the diluent coming from the gap upward;
a suction nozzle having a suction slit having an inlet near an end of the scraping blade in contact with the surface of the cooling roll; and
and an inhaler that applies a suction force to the suction nozzle so that the diluent scraped by the scraping blade can be sucked into the suction slit. delete According to claim 1,
In the inside of the suction nozzle, a suction path communicating with the suction slit is provided parallel to the suction slit, one end of the opposite ends of the suction path is blocked and the other end is a casting device for manufacturing a separator of a secondary battery connected to the suction unit . According to claim 1,
The pinch roll is composed of a cooling roll, and a diluent removing means for a pinch roll for removing the diluent from the surface of the pinch roll separated from the sheet-form raw material is provided at the lower portion of the pinch roll. 5. The method of claim 4,
The pinch roll diluent removal means,
a suction nozzle having a suction slit having an inlet in the vicinity of the pinch roll surface; and
and an inhaler that applies a suction force to the suction nozzle so that the diluent on the surface of the pinch roll can be sucked into the suction slit.

Images