CN210733231U

CN210733231U - Lithium battery diaphragm casting cooling system and casting machine

Info

Publication number: CN210733231U
Application number: CN201921574367.9U
Authority: CN
Inventors: 郅立鹏; 孙启龙; 金圣国; 陈继朝; 杨波
Original assignee: Qingdao Zhongke Hualian New Material Co ltd
Current assignee: Qingdao Zhongke Hualian New Material Co ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-06-12
Anticipated expiration: 2029-09-20

Abstract

The utility model relates to a lithium battery diaphragm casts piece cooling system and sheet casting machine, concretely relates to lithium battery diaphragm who combines with the chill roll cold casts piece cooling system and casts piece machine. The system comprises a shaping cooling roller used for conveying and cooling the melt cast sheet, a driven roller arranged at the rear section and used for conveying the cast sheet, and a cold water bath, wherein the lower part of the shaping cooling roller is immersed below the liquid level of the cold water bath. Compared with the prior art, the cooling device has simple structure and operation method, can realize the exchange or combination of two cooling modes of the cooling roller and the water bath, solves the problem of inconsistent cooling temperatures of the front side and the back side of the cast piece, and has strong adaptability to various cast pieces and cast pieces with various thicknesses.

Description

Lithium battery diaphragm casting cooling system and casting machine

Technical Field

The utility model relates to a lithium battery diaphragm casts piece cooling system, concretely relates to lithium battery diaphragm who combines with the chill roll cold casts piece cooling system of water bath.

The utility model discloses still relate to a lithium battery diaphragm casting machine who contains above-mentioned lithium battery diaphragm casting cooling system.

Background

The wet lithium ion battery diaphragm is formed by melt extrusion of high molecular polymer, biaxial stretching, extraction and secondary stretching. Melt extrusion means that a solid high molecular polymer is heated to a melt at a high temperature and then extruded from a die. The cast sheet is a sheet formed by extruding molten high molecular polymer from a die head and cooling and crystallizing the molten high molecular polymer by a shaping cooling roller.

That is to say, when the cast sheet of the existing lithium ion battery diaphragm casting machine is shaped, the cast sheet is attached to a shaping cooling roller, so that heat exchange is realized, and the purpose of cooling is achieved. But the cast sheet cannot be fully cooled when the thickness of the cast sheet is thicker, meanwhile, the back surface of the cast sheet is not provided with a cooling medium, the cooling purpose is achieved only through heat transfer of the cast sheet, the temperature difference between the surface attached to the roller surface and the back surface of the cast sheet can be caused by the cast sheet sizing mode, and finally the quality of a diaphragm product can be influenced.

In view of this, the present invention is especially provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a lithium battery diaphragm casts piece cooling system and casts piece machine, its structure and operating method are simple, can realize exchanging or combining of two kinds of cooling methods of chill roll cold and water bath cold, have solved the inconsistent problem of cast piece tow sides cooling temperature, and strong adaptability casts piece to various cast pieces and various thickness.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a lithium battery diaphragm casts piece cooling system, is including the design chill roll that is used for transmission and cooling melt to cast the piece and locate the back end and be used for the transmission cast the passive roller of piece, still include the cold water bath, the design chill roll lower part is immersed below the liquid level in cold water bath. One side of the cast sheet is contacted with a shaping cooling roller for cooling, and the other side is cooled in a cold water bath. Meanwhile, the two cooling methods may be switched to each other.

Preferably, a plurality of cooling water inlet pipes are arranged below the liquid level in the cold water bath and close to the shaping cooling roller. And cooling water is continuously introduced into the cooling water inlet pipe, so that the consistency of the cooling temperature is kept. Furthermore, an overflow port is arranged at the upper part of the cold water bath tank, and a circulating water pipeline is connected to the outside of the overflow port. And after heat exchange, the continuously introduced cooling water reaches the water level of the overflow port and flows out of the overflow port, and enters an external circulating water pipeline to start new circulation.

Preferably, a filtering device is further arranged between the overflow port and the circulating water pipeline. The filter means may be a filter screen. The filtering device can filter out particles left in water or cast pieces when the cast pieces are cooled, and the particles are removed periodically.

More preferably, the cold water bath may be a structure including an inner tank and an outer tank, that is, the inner tank is a cold water bath, the upper part of the inner tank is communicated with the outer tank through the overflow port, and the lower part of the outer tank is connected with the circulating water pipe. Further, the filter may be disposed between the outer wall of the inner tank and the inner wall of the outer tank.

Preferably, lithium battery diaphragm casts piece cooling system still includes the level set up side by side in setting chill roll next to, be used for cooling and supplementary setting backup roll chill roll, backup roll chill roll with setting chill roll presss from both sides tightly and cools off jointly the cast piece. The backup roll cooling roll and the shaping cooling roll rotate in the opposite direction and can also play a role in double-sided cooling, and the contact area between the cast sheet and the backup roll cooling roll is small, so that the backup roll cooling roll only plays a role in cooling a small amount.

And a plurality of cooling driving rollers are arranged between the shaping cooling roller and the driven roller. The cooling driving roller can play the roles of cooling and conveying the casting sheet.

And the upper part of the shaping cooling roller is also provided with a water scraping roller so as to scrape the moisture brought out of the shaping cooling roller.

When the cast sheet is produced to be thin and does not need to be cooled by a cold water bath, the water bath system can be closed, water in the cold water bath is completely emptied, and only the cooling roller is used for heat exchange, so that the purpose of cooling the cast sheet is achieved.

The utility model also provides a lithium battery diaphragm casting machine, included foretell lithium battery diaphragm casting piece cooling system.

Compared with the prior art, the utility model has the advantages of as follows:

(1) through the arrangement of the cold water bath tank, the cooling modes can be switched according to specific conditions when the cast pieces are cooled, and double-side cooling can be performed by combining application, so that the problem of inconsistent cooling temperatures of the front side and the back side of the cast pieces is solved, and the adaptability to various cast pieces and cast pieces with various thicknesses is strong.

(2) Through circulating cooling water system, further make cooling temperature keep the uniformity, ensured cast sheet cooling stability and diaphragm quality.

Drawings

Fig. 1 is a schematic structural view of a lithium battery separator cast sheet cooling system according to embodiment 1 of the present invention.

Description of reference numerals: 1-die head, 2-backup roller cooling roller, 3-cold water bath, 4-overflow port, 5-filter screen, 6-circulating water pipeline, 7-cooling water inlet pipe, 8-water scraping roller, 9-sizing cooling roller, 10-cooling driving roller and 11-driven roller.

Detailed Description

The technical solutions of the present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which should not be construed as limiting the scope of the present invention.

Example 1

A lithium battery diaphragm casting sheet cooling system comprises a shaping cooling roller 9 used for conveying and cooling a melt casting sheet, a driven roller 11 arranged at the rear section and used for conveying the casting sheet, and a cold water bath 3, wherein the lower part of the shaping cooling roller 9 is immersed below the liquid level of the cold water bath 3, as shown in figure 1. One side of the cast piece is contacted with a shaping cooling roller 9 for cooling, and the other side is cooled in a cold water bath 3. Meanwhile, the two cooling methods may be switched to each other.

In the embodiment, a plurality of cooling water inlet pipes 7 are arranged below the liquid level in the cold water bath 3 and close to the shaping cooling roller 9, and cooling water is continuously introduced into the cooling water inlet pipes 7 to keep the consistency of the cooling temperature.

Furthermore, the upper part of the cold water bath tank 3 is provided with an overflow port, and the outside of the overflow port is connected with a circulating water pipeline. And after heat exchange, the continuously introduced cooling water reaches the water level of the overflow port and flows out of the overflow port, and enters an external circulating water pipeline to start new circulation.

In the embodiment, as shown in fig. 1, the cold water bath 3 includes an inner tank and an outer tank, the inner tank is a cold water bath, an overflow port 4 is provided at the upper part of the inner tank, the upper part of the inner tank is communicated with the outer tank through the overflow port 4, and a circulating water pipe 6 is connected to the lower part of the outer tank. And a filter screen 5 is arranged between the outer wall of the inner groove and the inner wall of the outer groove.

The system also comprises a backup cooling roller 2 which is horizontally arranged beside the shaping cooling roller 9 side by side, and the backup cooling roller 2 and the shaping cooling roller 9 clamp the cast sheet together. The backup cooling roller 2 and the shaping cooling roller 9 rotate in opposite directions, and can also play a role in double-sided cooling.

A plurality of cooling driving rollers 10 are arranged between the shaping cooling roller 9 and the driven roller 11, and the cooling driving rollers 10 can play a role in cooling and conveying the cast pieces.

The upper part of the shaping cooling roller 9 is also provided with a water scraping roller 8 so as to scrape the moisture carried out on the shaping cooling roller 9.

The melt cast sheet flowing out of the die head 1 flows between the shaping cooling roller 9 and the backup roller cooling roller 2 for initial cooling, then enters the cold water bath 3 for full double-sided cooling, passes through the cooling driving roller 10 and the driven roller 11, and is pulled to the next device. When the equipment works, cold water continuously flows into the cooling water inlet pipe 7 in the cold water bath 3, and the surface layer cold water overflows the overflow port 4 and is pumped out by the circulating water pipeline 6 after being filtered by the filter screen 5.

When the cast sheet is produced to be thin and does not need to be cooled by the cold water bath 3, the water bath system can be closed, water in the cold water bath 3 is completely emptied, and only the cooling roller is used for heat exchange, so that the purpose of cooling the cast sheet is achieved.

The embodiment also provides a lithium battery diaphragm casting machine which comprises the lithium battery diaphragm casting cooling system.

While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

1. The utility model provides a lithium battery diaphragm casts piece cooling system, is including the design chill roll that is used for transmission and cooling melt to cast the piece and locate the back end and be used for the transmission cast the driven roll of piece, its characterized in that still includes the cold water bath, the design chill roll lower part is immersed below the liquid level in cold water bath.

2. The lithium battery diaphragm casting cooling system according to claim 1, wherein a plurality of cooling water inlet pipes are arranged below the liquid level in the cooling water bath and near the shaping cooling roller.

3. The lithium battery diaphragm casting cooling system according to claim 1 or 2, wherein an overflow port is formed in the upper portion of the cold water bath tank, and a circulating water pipeline is connected to the outside of the overflow port.

4. The lithium battery diaphragm casting cooling system according to claim 3, wherein a filtering device is further arranged between the overflow port and the circulating water pipeline.

5. The lithium battery diaphragm cast sheet cooling system according to claim 4, wherein the cold water bath comprises an inner tank and an outer tank, the inner tank is a cold water bath, the upper part of the inner tank is communicated with the outer tank through the overflow port, and the lower part of the outer tank is connected with the circulating water pipeline.

6. The lithium battery separator cast sheet cooling system according to claim 5, wherein the filtering device is disposed between the outer wall of the inner tank and the inner wall of the outer tank.

7. The lithium battery separator cast sheet cooling system according to claim 1, further comprising backup cooling rollers horizontally arranged beside the sizing cooling rollers side by side, wherein the backup cooling rollers and the sizing cooling rollers jointly clamp the cast sheet.

8. The lithium battery separator cast sheet cooling system according to claim 1, wherein a plurality of cooling transmission rollers are arranged between the shaping cooling roller and the driven roller.

9. The lithium battery diaphragm casting cooling system according to claim 1, wherein a water scraping roller is further arranged on the upper portion of the shaping cooling roller.

10. A lithium battery separator casting machine, characterized by comprising a lithium battery separator casting cooling system according to any one of claims 1 to 9.