CN213242754U - Cast sheet forming and cooling device for lithium battery diaphragm production - Google Patents
Cast sheet forming and cooling device for lithium battery diaphragm production Download PDFInfo
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- CN213242754U CN213242754U CN202022180304.4U CN202022180304U CN213242754U CN 213242754 U CN213242754 U CN 213242754U CN 202022180304 U CN202022180304 U CN 202022180304U CN 213242754 U CN213242754 U CN 213242754U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a cast sheet forming cooling device for lithium battery diaphragm production, which comprises a cooling tank, a first chill roll, a second chill roll and a stripping roll; the cooling tank is used for containing cooling liquid; the first chill roll and the second chill roll are oppositely matched and arranged in the cooling tank and are used for synchronously cooling the front and back surfaces of the melt, and then the first chill roll runs and is immersed in the cooling tank, so that the front and back surfaces of the first chill roll are respectively cooled by the first chill roll and the cooling liquid in the cooling tank to form a cast sheet; the stripping roller and the second chill roller are respectively arranged at two sides of the first chill roller, and the stripping roller is used for stripping the cast sheet from the first chill roller. The utility model discloses cast piece shaping cooling device can be used to lithium cell diaphragm production, wherein sets up through the cooperation of first chill roll, second chill roll and cooling bath, can improve the rerum natura uniformity of film greatly.
Description
Technical Field
The utility model relates to a lithium cell production facility especially relates to a cast piece shaping cooling device for production of lithium cell diaphragm.
Background
The lithium ion battery diaphragm is divided into a dry method and a wet method according to different preparation processes, and the wet method is also called a phase separation method or a thermal separation method. The wet process is to mix polypropylene (PP) or Polyethylene (PE) with white oil, to form uniform melt mixture after heating and melting by an extruder, then to cool and phase separate by a casting process to prepare a microporous membrane, to heat the membrane to a temperature close to the melting point, to perform biaxial tension to align molecular chains, to preserve heat for a certain time, to elute residual solvent by volatile substances, to prepare the mutually communicated microporous membrane material.
Currently, the following two common methods for thermally induced phase separation in the sheet casting process are used: 1. the method comprises the following steps of (1) setting the temperature of a chilling roller by using the chilling roller, attaching melt flowing out of a die head to the chilling roller, enabling the melt to be rapidly cooled, and enabling white oil to be rapidly separated from PE/PP to form micropores; 2. the method comprises the following steps of using a chilling roller and a water tank, wherein water with a certain temperature is filled in the water tank, cooling the melt by using the water and the chilling roller simultaneously when the melt is attached, and reducing the difference of the thermal phase separation speed of the front side (namely the film surface contacting the chilling roller) and the back side (namely the film surface not contacting the chilling roller) of the diaphragm. In the former method using the chill roll, when the melt is attached with the sheet, because the temperature of the air is inconsistent with that of the chill roll, the phase separation rate of the front surface and the back surface is inconsistent, and the crystallization rate is inconsistent, the consistency of the physical properties of the film is influenced; in the latter method using a chill roll and a water tank, since the boiling point of water is 100 ℃, and the melt enters the water tank after being cast, the film surface temperature is not necessarily lower than 100 ℃, and when the film surface temperature is higher than or equal to 100 ℃, the water in contact with the film surface boils, which adversely affects the appearance of the film.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a cast sheet shaping cooling device for lithium cell diaphragm production.
In a first aspect, an embodiment of the present invention provides a cast sheet forming cooling device for lithium battery diaphragm production, including a cooling tank, a first chill roller, a second chill roller and a stripping roller; the cooling tank is used for containing cooling liquid; the first chill roll and the second chill roll are oppositely matched and arranged in the cooling tank and are used for synchronously cooling the front and back surfaces of the melt, and then the melt is immersed into the cooling tank along with the operation of the first chill roll, so that the front and back surfaces of the melt are respectively cooled by the first chill roll and the cooling liquid in the cooling tank to form a cast sheet; the stripping roller and the second chill roller are respectively arranged at two sides of the first chill roller, and the stripping roller is used for stripping the cast sheet from the first chill roller.
The utility model discloses a cast sheet shaping cooling device for lithium battery diaphragm production has following beneficial effect at least: the cast sheet forming and cooling device is arranged by matching the first chill roll, the second chill roll and the cooling tank, in the using process, high-temperature melt flowing out of the die head is attached to the first chill roll, meanwhile, the second chill roll can be matched to synchronously cool a high-temperature melt film attached to the first chill roll, the back surface of the diaphragm is contacted with the second chill roll when the front surface of the diaphragm is contacted with the first chill roll to carry out thermally induced phase separation, and simultaneously, the thermally induced phase separation is fully carried out, and by controlling the temperature consistency of the two chill rolls, the front surface and the back surface of the diaphragm can be fully subjected to thermally induced phase separation at the same speed, so that the physical property consistency of the film is greatly improved; after being synchronously cooled by the first chilling roller and the second chilling roller, the liquid is cooled by the first chilling roller and the cooling liquid in the cooling tank, so that the problem that the film surface appearance is influenced by boiling of the cooling liquid caused by overhigh temperature when the liquid enters the cooling tank can be avoided.
According to other embodiments of the utility model, a cast sheet shaping cooling device for lithium battery diaphragm production still includes the compression roller, the compression roller with peel roller sets up relatively, be used for with peel roller cooperation extrusion is got rid of remaining coolant liquid on the cast sheet.
According to other embodiments of the utility model, a cast sheet shaping cooling device for lithium battery diaphragm production still includes the deoiling device, it is relative to deoiling the device the roll surface setting of first chill roll.
According to other embodiments of the present invention, the oil removing device is an oil scraping knife.
According to other embodiments of the present invention, the cast sheet molding cooling device for lithium battery separator production further comprises a die head, the die head has a discharge port, the discharge port is provided between the first chill roll and the second chill roll.
According to other embodiments of the present invention, the first chill roller and the first chill roller are angularly symmetric with respect to the die.
According to other embodiments of the present invention, the die head has at least two discharge channels arranged in a stack.
According to other embodiments of the utility model, a cast sheet shaping cooling device for lithium battery diaphragm production still includes temperature control device, temperature control device respectively with first chill roll with the second chill roll is connected, is used for regulating and control first chill roll with the roll surface temperature of second chill roll.
According to other embodiments of the present invention, the cast sheet forming and cooling device for lithium battery separator production further comprises a position control device, wherein the position control device is connected to the second chill roller for driving the second chill roller to move in a direction close to or away from the first chill roller.
According to further embodiments of the present invention, the first chill roll has a diameter of 0.8 to 1 m; the diameter of the second chill roll is 0.1-0.3 m.
Drawings
Fig. 1 is a schematic structural diagram of a cast sheet forming and cooling device for producing a lithium battery diaphragm according to an embodiment of the present invention.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, but not for indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected", or "mounted" on another feature, it can be directly disposed, fixed, or connected to the other feature or indirectly disposed, fixed, connected, or mounted on the other feature. In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a cast sheet forming and cooling device for lithium battery separator production according to an embodiment of the present invention. The cast sheet forming cooling device comprises a cooling tank 10, a first chill roller 20, a second chill roller 30 and a stripping roller 40; the cooling tank 10 is used for containing cooling liquid; the first chill roll 20 and the second chill roll 30 are arranged in the cooling tank 10 in a matching manner (specifically, can be arranged above the inside of the cooling tank 10) and used for synchronously cooling the front and back sides of the melt, and then the melt is immersed into the cooling tank 10 along with the operation of the first chill roll 20, so that the front and back sides of the melt are respectively cooled by the first chill roll 20 and the cooling liquid in the cooling tank 10 to form a cast piece 50; the stripping roller 40 and the second chill roller 30 are respectively arranged at two sides of the first chill roller 20, and the stripping roller 40 is used for guiding the cast sheet 50 to be stripped from the first chill roller 20.
The size and material of first chill roller 20 and second chill roller 30 may be set as desired. The first chill roll 20 is used as a main chill roll, melt is coated on the first chill roll 20 after being extruded, if the roll diameter of the first chill roll 20 is too small, the cooling time of the attached sheet is insufficient, the cooling uniformity is poor, and the cooling effect of the attached sheet is affected, so the roll diameter of the first chill roll 20 cannot be too small; the second chill roller 30 is used as an auxiliary chill roller, the influence of the roller diameter on the cooling effect is smaller than that of the first chill roller 20, the manufacturing cost can be reduced by properly reducing the roller diameter, the production operation and the equipment maintenance and replacement are convenient, and therefore, the roller diameter of the second chill roller 30 is not larger than that of the first chill roller 20; preferably, the diameter of the first chill roll 20 can be designed to be 0.8-1 m, and the diameter of the second chill roll 30 is 0.1-0.3 m; the material of both can adopt 321 stainless steel or other materials.
In the present embodiment, the cast piece forming and cooling apparatus further includes a pressing roller 60, and the pressing roller 60 is disposed opposite to the peeling roller 40, and is used for cooperating with the peeling roller 40 to press and remove the residual cooling liquid on the cast piece 50. In use, the cast slab 50 is passed around the nip between the pinch roll 60 and the stripping roll 40 to remove residual coolant from the cast slab 50 by the squeezing action of the two. Through the above structure arrangement, the peeling roller 40 can serve as an auxiliary pressing roller matched with the pressing roller 60 while playing a role in peeling and guiding, so that the device structure arrangement can be simplified, and the cost can be reduced.
In addition, the cast sheet forming and cooling device may further include an oil removing device 70, the oil removing device 70 is disposed opposite to the roller surface of the first chill roller 20, and the oil removing device 70 may employ an oil removing roller or an oil scraping knife. In the present embodiment, the oil removing device 70 is an oil scraping blade, and the length of the oil scraping blade may be designed to be greater than or equal to the length of the first chill roller 20, so as to improve the oil scraping efficiency.
In order to facilitate production operation, the cast sheet forming cooling device may further include a die head 80, the die head 80 has a discharge port, and the discharge port of the die head 80 may be specifically disposed between the first chill roller 20 and the second chill roller 30, so that, in use, a high-temperature melt flowing out from the die head 80 may be attached to the first chill roller 20, and the second chill roller 30 may be adapted to synchronously cool a high-temperature melt film attached to the first chill roller 20. To improve the uniformity of the shaped cast sheet, first chill roll 20 and second chill roll 30 may be designed to be angularly symmetric with respect to die 80.
In addition, in order to flexibly set the diaphragm with the corresponding number of layers according to the layer structure requirement of the lithium battery diaphragm, the die head 80 may be designed to have at least two discharging channels arranged in a stacked manner, for example, the die head 80 may be designed to have two, three or five discharging channels arranged in a stacked manner, the number of the discharging channels may be specifically set according to the structure requirement of the diaphragm, and when in use, the material corresponding to the layer body may be injected into the corresponding discharging channels. Of course, in some embodiments, die 80 may also be designed with a single exit channel.
In order to accurately control the cooling temperature of the chill roll, the cast sheet forming cooling device can also be designed to comprise a temperature control device, and the temperature control device is respectively connected with the first chill roll 20 and the second chill roll 30 and is used for regulating and controlling the roll surface temperature of the first chill roll 20 and the second chill roll 30. The temperature control device can adopt process chilled water control, and particularly, a water inlet pipe and a water outlet pipe can be arranged on the chilling roller, and the flow of process chilled water entering and exiting the chilling roller is controlled through the water inlet pipe and the water outlet pipe so as to control the temperature. In addition, the cast strip forming cooling device can also be designed to comprise a position control device, and the position control device is connected with the second chill roller 30 and is used for driving the second chill roller 30 to move towards or away from the first chill roller 20. Through the arrangement of the position control device, the specific position of the second chill roll 30 can be flexibly adjusted according to the size of the diaphragm, and the applicability of the device is improved. When the cooling device is used, high-temperature melt is attached to the first chill roller 20, the second chill roller 30 can be synchronously operated to be attached to the other side of the high-temperature melt on the first chill roller 20 through the position control device, the temperature and the rotating speed of the second chill roller 30 are controlled to be the same as those of the first chill roller 20, the rotating directions of the second chill roller 30 and the first chill roller 20 are opposite, and therefore the front side and the back side of the high-temperature melt attached to the first chill roller 20 are synchronously cooled through the first chill roller 20 and the second chill roller 30 respectively. In addition, to facilitate uniform control, it may be desirable that the first chill roller 20 and the second chill roller 30 be controlled by the same control system.
The utility model discloses cast sheet shaping cooling device can be used to lithium cell diaphragm production, wherein, through first chill roll 20, second chill roll 30 and cooling bath 10's cooperation setting, in the use, the high temperature fuse-element that flows out from die head 80 is attached on first chill roll 20, can use second chill roll 30 cooperation to carry out synchronous cooling to the high temperature fuse-element tectorial membrane that attaches on first chill roll 20 simultaneously, the front of diaphragm is when contacting first chill roll 20 and carrying out thermally induced phase separation, the reverse side contacts with second chill roll 30, fully carry out thermally induced phase separation simultaneously, temperature through controlling two chill rolls is unanimous, can make the positive and negative of diaphragm fully carry out thermally induced phase separation with same speed, improve the rerum natura uniformity of film greatly; after being synchronously cooled by the first chill roll 20 and the second chill roll 30, the cooling liquid in the first chill roll 20 and the cooling tank 10 is cooled, so that the problem that the film surface appearance is influenced by the boiling of the cooling liquid caused by overhigh temperature when the cooling liquid enters the cooling tank can be avoided.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A cast sheet forming and cooling device for lithium battery diaphragm production is characterized by comprising a cooling tank, a first chill roll, a second chill roll and a stripping roll; the cooling tank is used for containing cooling liquid; the first chill roll and the second chill roll are oppositely matched and arranged in the cooling tank and are used for synchronously cooling the front and back surfaces of the melt, and then the melt is immersed into the cooling tank along with the operation of the first chill roll, so that the front and back surfaces of the melt are respectively cooled by the first chill roll and the cooling liquid in the cooling tank to form a cast sheet; the stripping roller and the second chill roller are respectively arranged at two sides of the first chill roller, and the stripping roller is used for stripping the cast sheet from the first chill roller.
2. The cast sheet forming and cooling device for lithium battery diaphragm production as claimed in claim 1, further comprising a pressing roller, wherein the pressing roller is arranged opposite to the peeling roller and is used for being matched with the peeling roller to squeeze and remove the residual cooling liquid on the cast sheet.
3. The cast sheet forming and cooling device for lithium battery diaphragm production as claimed in claim 1, further comprising an oil removing device, wherein the oil removing device is arranged opposite to the roller surface of the first chill roller.
4. The cast sheet forming and cooling device for lithium battery diaphragm production as claimed in claim 3, wherein the oil removing device is an oil scraper.
5. The cast sheet forming and cooling device for producing the lithium battery diaphragm as claimed in claim 1, further comprising a die head, wherein the die head is provided with a discharge port, and the discharge port is arranged between the first chill roller and the second chill roller.
6. The cast sheet forming and cooling device for lithium battery separator production as claimed in claim 5, wherein the first chill roll and the first chill roll are angle symmetric with respect to the die head.
7. The cast sheet forming and cooling device for producing the lithium battery diaphragm as claimed in claim 5, wherein the die head is provided with at least two discharging channels which are arranged in a stacked mode.
8. The cast sheet forming and cooling device for producing the lithium battery diaphragm as claimed in claim 1, further comprising a temperature control device, wherein the temperature control device is respectively connected with the first chill roller and the second chill roller and is used for regulating and controlling the roller surface temperature of the first chill roller and the second chill roller.
9. The cast sheet forming and cooling device for lithium battery diaphragm production as claimed in claim 1, further comprising a position control device, wherein the position control device is connected with the second chill roller and is used for driving the second chill roller to move towards or away from the first chill roller.
10. The cast sheet forming and cooling device for lithium battery diaphragm production as claimed in any one of claims 1 to 9, wherein the diameter of the first chill roll is 0.8-1 m; the diameter of the second chill roll is 0.1-0.3 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022180304.4U CN213242754U (en) | 2020-09-28 | 2020-09-28 | Cast sheet forming and cooling device for lithium battery diaphragm production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022180304.4U CN213242754U (en) | 2020-09-28 | 2020-09-28 | Cast sheet forming and cooling device for lithium battery diaphragm production |
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| CN213242754U true CN213242754U (en) | 2021-05-18 |
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| CN202022180304.4U Active CN213242754U (en) | 2020-09-28 | 2020-09-28 | Cast sheet forming and cooling device for lithium battery diaphragm production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188657A (en) * | 2021-11-11 | 2022-03-15 | 乐凯胶片股份有限公司 | Lithium battery diaphragm casting cooling method and system and application thereof |
| CN114950875A (en) * | 2022-05-31 | 2022-08-30 | 广东嘉拓自动化技术有限公司 | Two-sided coating equipment simultaneously |
-
2020
- 2020-09-28 CN CN202022180304.4U patent/CN213242754U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114188657A (en) * | 2021-11-11 | 2022-03-15 | 乐凯胶片股份有限公司 | Lithium battery diaphragm casting cooling method and system and application thereof |
| CN114950875A (en) * | 2022-05-31 | 2022-08-30 | 广东嘉拓自动化技术有限公司 | Two-sided coating equipment simultaneously |
| CN114950875B (en) * | 2022-05-31 | 2023-08-04 | 广东嘉拓自动化技术有限公司 | Double-sided simultaneous coating equipment |
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