CN213000873U

CN213000873U - Coating unit and coating system having the same

Info

Publication number: CN213000873U
Application number: CN202021466757.7U
Authority: CN
Inventors: 郑晓醒; 秦士林; 赵晓宁; 蔡挺威; 马忠龙
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-04-20
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses a coating unit and coating system who has this coating unit, the coating unit includes: coating mechanism, stoving mechanism and swager construct, coating mechanism includes material pond, sizing roller and compression roller, the compression roller with the sizing roller is relative and the clearance sets up to the messenger treats that the base member of coating is suitable for the follow the compression roller with pass through between the sizing roller, at least part of sizing roller is located in the material pond, in order will when rolling feed liquid in the material pond takes out and the coating is in on the base member, stoving mechanism locates coating mechanism's low reaches, and is used for with the coating and is in feed liquid stoving on the base member is the material powder, swager constructs to locate stoving mechanism's low reaches, and be used for with the material powder compaction after drying in the base member. According to the utility model discloses a coating unit adopts the mode of wet process impression, can improve the flying powder problem, has improved the security to can improve the even and the reliability of coating.

Description

Coating unit and coating system having the same

Technical Field

The utility model belongs to the technical field of the coating technique and specifically relates to a coating unit and coating system who has this coating unit are related to.

Background

With the increasing demand for long standby time of portable electronic products and the rapid development of high-power devices such as electric vehicles and electric bicycles, the demand for energy density and service life of batteries is increasing dramatically. Lithium metal has extremely high theoretical specific capacity and lowest potential, so the lithium metal secondary battery is a preferred system of the next generation of high energy density energy storage devices. However, during the first charging process of the battery, a solid electrolyte layer formed on the surface of the negative plate consumes a part of lithium, which results in lithium loss in the positive electrode material, and thus the capacity of the battery is reduced; or lithium and some active materials in the negative plate, such as: silicon, tin, etc. form alloys and also cause lithium loss from the positive electrode material. In order to reduce the capacity loss, the negative electrode sheet is considered to be subjected to pre-lithiation treatment, and although some pre-lithiation treatment methods exist in the related art, the methods have some disadvantages more or less and need to be improved.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention aims to provide a coating unit, which can improve the powder flying problem, improve the safety, and improve the uniformity and reliability of coating.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a coating unit, comprising: the coating mechanism comprises a material pool, a bonding roller and a press roller, wherein the press roller is opposite to the bonding roller and is arranged at a gap so that a substrate to be coated is suitable for passing between the press roller and the bonding roller, and at least part of the bonding roller is positioned in the material pool so as to take out the material liquid in the material pool and coat the material liquid on the substrate when rolling; the drying mechanism is arranged at the downstream of the coating mechanism and is used for drying the feed liquid coated on the substrate into powder; and the pressing mechanism is arranged at the downstream of the drying mechanism and is used for compacting the dried powder on the substrate.

In some embodiments, the coating mechanism comprises: and the stirring paddle is positioned in the feed tank and is used for stirring the feed liquid in the feed tank.

In some embodiments, the coating mechanism comprises: and the scraping plate is matched with the bonding roller and is used for scraping the redundant feed liquid on the bonding roller before the bonding roller coats the feed liquid on the substrate.

In some embodiments, one end of the scraping plate is mounted to the material pool, and the other end of the scraping plate extends towards the direction of the material sticking roller and is used for scraping materials.

In some embodiments, the glue roller has a threaded groove thereon.

In some embodiments, the swage mechanism comprises: the two nip rolls are opposite and arranged at a gap so that the substrate is suitable for passing between the two nip rolls.

In some embodiments, the coating unit comprises: the sealed cabin is provided with an inlet and an outlet, the inlet is suitable for the base body to enter the sealed cabin, the outlet is suitable for the base body to move out of the sealed cabin, and the drying mechanism is located in the sealed cabin so as to dry the feed liquid on the base body in the sealed cabin.

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

the utility model discloses coating unit adopts the mode of wet process impression, can improve the flying powder problem, has improved the security to can improve the even and the reliability of coating.

Another objective of the present invention is to provide a coating system, which comprises a traction unit, wherein the traction unit comprises an unwinding mechanism and a winding mechanism, and the substrate is unwound by the unwinding mechanism and wound by the winding mechanism; and the coating unit is positioned at the downstream of the unreeling mechanism and the upstream of the reeling mechanism.

In some embodiments, the coating system comprises two of the coating units, the traction unit further comprising: and the turnover mechanism is positioned between the two coating units, so that the coating unit at the upstream of the turnover mechanism coats the surface of one side of the thickness of the substrate, and the coating unit at the downstream of the turnover mechanism coats the surface of the other side of the thickness of the substrate.

In some embodiments, the coating system is used for supplementing lithium to a pole piece of a lithium battery, the substrate is the pole piece, the powder is lithium powder, and the coating system further includes: the cloth film unwinding mechanism is used for covering a film on the base body when the base body is wound, so that the film and the base body enter the winding mechanism together.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic view of a coating system according to an embodiment of the present invention.

Description of reference numerals:

1000-coating system; 100-coating unit: 200-a traction unit;

1-a coating mechanism; 11-a material pool; 12-a sizing roller; 13-a press roll; 14-stirring paddle; 15-scraping plate;

2-a drying mechanism; 3-a material pressing mechanism; 31-nip rolls; 4-sealing the cabin;

5, an unwinding mechanism; 6, a winding mechanism; 7-turning over mechanism; 8-a guide roller; 9-a cloth film unwinding mechanism;

2000-base body; 3000-film.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

Next, referring to fig. 1, a coating unit 100 and a coating system 1000 having the coating unit 100 according to an embodiment of the present invention are described.

As shown in fig. 1, the coating unit 100 includes a coating mechanism 1, the coating mechanism 1 includes a material pool 11, a material sticking roller 12 and a press roller 13, the press roller 13 is arranged opposite to and at a gap from the material sticking roller 12, so that a substrate 2000 to be coated is suitable for passing between the press roller 13 and the material sticking roller 12, at least a part of the material sticking roller 12 is positioned in the material pool 11, so that a part of the material sticking roller 12 can be contacted with a material liquid in the material pool 11, and the material liquid in the material pool 11 can be taken out and coated on the substrate 2000 during the rolling process of the material sticking roller 12.

That is, during the rolling process of the adhesive roller 12, the feed liquid in the material pool 11 can be taken out and then coated on the substrate 2000 contacting with the adhesive roller 12, wherein a gap exists between the press roller 13 and the adhesive roller 12, and the press roller 13 cooperates with the adhesive roller 12 to provide pressure, so that the substrate 2000 can reliably contact with the adhesive roller 12, and the feed liquid on the adhesive roller 12 can be transferred to the substrate 2000.

The feed liquid refers to a dispersion liquid mixed with the powder, that is, a powder dispersion liquid, and for example, when the powder is lithium powder, the feed liquid is a lithium powder dispersion liquid. In addition, the substrate 2000 may be selected according to actual conditions, and may be, for example, a pole piece of a battery, other cloth, a metal sheet, a plastic sheet, or the like. For example, in some specific examples, when base 2000 is the pole piece, when the feed liquid is the lithium powder dispersion, coating mechanism 1 can be used for transferring the lithium powder dispersion to the pole piece surface, thereby the utility model discloses coating mechanism 1 of embodiment can be used to mend the lithium operation to the pole piece of lithium cell, and wherein, the lithium cell can be lithium ion battery, lithium metal battery, lithium empty battery, lithium sulphur battery etc.. However, the utility model is not limited to this, the utility model discloses also can be used to other products that need the coating to have material powder dispersion, other material powder dispersion coatings can adopt equally promptly the utility model discloses a coating mechanism 1.

As shown in fig. 1, the coating unit 100 includes a drying mechanism 2 and a pressing mechanism 3, the drying mechanism 2 is disposed at the downstream of the coating mechanism 1, and the pressing mechanism 3 is disposed at the downstream of the drying mechanism 2, that is, after the substrate 2000 leaves the coating mechanism 1, the substrate is processed by the drying mechanism 2 and then processed by the pressing mechanism 3, wherein the drying mechanism 2 is configured to dry the material liquid coated on the substrate 2000 into the material powder, and the pressing mechanism 3 is configured to compact the dried material powder on the substrate 2000, so as to reliably coat the material powder on the substrate 2000. Wherein, through setting up stoving mechanism 2 to be favorable to follow-up swager mechanism 3 to handle, appear the problem that the powder glues on swager mechanism 3 when avoiding pressing, thereby can promote the product yield, and can make the powder coating on base member 2000 reliably through setting up swager mechanism 3.

From this, according to the utility model discloses coating unit 100, the mode through wet process impression will expect the powder to coat in base member 2000 to can avoid adopting the dry powder direct coating to the flying powder problem that probably takes place when base member 2000 in the correlation technique, and then improve the security of operation, moreover, will expect the powder dispersion and obtain the feed liquid in the dispersion, coat base member 2000 with the feed liquid for directly coating base member 2000 with the dry powder, the material powder can be more even on base member 2000 dispersedly, the coating effect is better.

In some embodiments of the present invention, as shown in fig. 1, the coating mechanism 1 further includes a stirring paddle 14, and the stirring paddle 14 is located in the material pool 11 for stirring the material liquid in the material pool 11. Therefore, the mixing uniformity of the material powder and the dispersion liquid in the material liquid can be improved by utilizing the stirring of the stirring paddle 14, so that the material powder can be dispersed on the substrate 2000 more uniformly, and the coating effect is better. It should be noted that the number of the paddles 14 in the material tank 11 is not limited, and may be one or more, and the rotation speed of the paddles 14 is not limited, and may be uniform speed or variable speed, etc.

In some embodiments of the present invention, as shown in fig. 1, the coating mechanism 1 further includes a scraping plate 15, the scraping plate 15 cooperates with the adhesive roller 12, and is used to scrape off the excessive material liquid on the adhesive roller 12 before the adhesive roller 12 coats the material liquid on the substrate 2000, thereby effectively improving the uniformity of the coating of the material powder on the substrate 2000. For example, in the example shown in fig. 1, for the upper adhesive roll 12, when the adhesive roll 12 rotates clockwise, the scraper 15 is arranged at the left side of the adhesive roll 12, so that the excess liquid on the adhesive roll 12 can be scraped before the adhesive roll 12 applies the liquid to the substrate 2000; in the case of the lower adhesive roll 12, when the adhesive roll 12 rotates counterclockwise, the scraper 15 is disposed at the right side of the adhesive roll 12, so that the excess liquid on the adhesive roll 12 can be scraped before the adhesive roll 12 applies the liquid to the substrate 2000.

In some embodiments of the present invention, as shown in fig. 1, one end of the scraping plate 15 is installed in the material pool 11, and the other end of the scraping plate 15 extends toward the direction of the material sticking roller 12 and is used for scraping. Therefore, the scraper 15 is simple in installation mode and reliable in scraping effect. Of course, the utility model is not limited to this, in the utility model discloses an in other embodiments, can also install scraping flitch 15 on other parts, in addition, can set scraping flitch 15 to relative material pond 11 movable, adjustable or fixed and so on, as long as satisfy scrape the material effect can, here does not describe repeatedly.

In some embodiments of the present invention, as shown in fig. 1, the glue roll 12 has a threaded groove, i.e., a groove extending along the spiral line around the glue roll 12. That is, the surface of the material sticking roller 12 is threaded, so that the material liquid can be uniformly adsorbed by the capillary action of the thread groove, and the adsorption amount of the material liquid can be controlled by changing the depth of the thread groove, so as to control the coating amount of the material liquid on the substrate 2000, for example, when the substrate 2000 is a pole piece and the material liquid is a lithium powder dispersion liquid, the pre-lithium amount of the pole piece can be controlled by changing the depth of the thread groove. It should be noted that the depth of the thread groove is not limited, and may be, for example, 0.1mm to 5mm, etc., so that the coating mechanism 1 may be detached and replaced with a plurality of adhesive rollers 12 having thread grooves with different depths, thereby meeting the pre-lithium amount requirements of different products.

Furthermore, in some embodiments of the present invention, the glue roll 12 may be made of a high hardness, wear resistant alloy steel material. In addition, the adsorption capacity of the feed liquid can be controlled by adjusting the concentration of the feed liquid, i.e. the pre-lithium amount can be controlled by adjusting the concentration of the feed liquid and the depth of the thread groove of the material sticking roller 12, for example, the pre-lithium amount can be controlled at 0.01mg/cm²-5mg/cm²To obtain precise control.

In some embodiments of the present invention, as shown in fig. 1, the nip mechanism 3 may include two nip rolls 31, and the two nip rolls 31 are opposite and arranged with a gap, so that the substrate 2000 is suitable for passing between the two nip rolls 31. From this, swager constructs 3 simply, can guarantee on the one hand that base member 2000 passes through smoothly, and on the other hand can simply and effectively with the powder compaction in base member 2000. Of course, the present invention is not limited to this, and the compacting of the powder can also be realized through other modes, for example, the pressing mechanism 3 can also include two pressing plates that can move in opposite directions and in opposite directions, and the details are not described here.

In some embodiments, the gap between the bonding roll 12 and the press roll 13 can be adjusted, and the gap between the two nip rolls 31 can be adjusted, so that the coating requirements of different substrates 2000 can be better met. In addition, the material of the pressure roll 13 and the nip roll 31 is not limited, and may be made of, for example, an alloy steel material having a smooth surface, low friction, high hardness, and wear resistance.

In some embodiments of the present invention, as shown in fig. 1, the coating unit 100 includes a sealed cabin 4, the sealed cabin 4 has an inlet and an outlet, the inlet is suitable for the substrate 2000 to enter the sealed cabin 4, the outlet is suitable for the substrate 2000 to move out of the sealed cabin 4, that is, the sealed cabin 4 is sealed except for the inlet and the outlet, and the other parts are sealed, and the drying mechanism 2 is located in the sealed cabin 4 to dry the material liquid on the substrate 2000 in the sealed cabin 4. Therefore, the problem of powder flying in the drying process can be avoided, and the safety is improved.

In addition, it should be noted that the specific configuration of the drying mechanism 2 is not limited, for example, it may be an electric heating device or other heating devices, and the heating adjustable temperature of the drying mechanism 2 is not limited, for example, it may be adjusted between room temperature and 200 ℃, and may be specifically selected and set according to the actual situation, and is not described herein again.

As shown in fig. 1, a coating system 1000 according to an embodiment of the present invention includes a drawing unit 200 and the coating unit 100 of any of the above embodiments. The traction unit 200 includes an unwinding mechanism 5 and a winding mechanism 6, the substrate 2000 is unwound by the unwinding mechanism 5 and wound by the winding mechanism 6, at least one coating unit 100 is provided, and each coating unit 100 is located at the downstream of the unwinding mechanism 5 and the upstream of the winding mechanism 6. Thus, the substrate 2000 discharged from the unwinding mechanism 5 may be wet-embossed by the at least one coating unit 100 before being wound by the winding mechanism 6, thereby improving uniformity, reliability, and safety of coating powder on the substrate 2000.

In some embodiments of the present invention, as shown in fig. 1, the coating system 1000 includes two coating units 100, the traction unit 200 further includes a turnover mechanism 7, and the turnover mechanism 7 is located between the two coating units 100, so that the coating unit 100 at the upstream of the turnover mechanism 7 applies a surface coating to one side of the thickness of the substrate 2000, and the coating unit 100 at the downstream of the turnover mechanism 7 applies a surface coating to the other side of the thickness of the substrate 2000. That is, the substrate 2000 paid out by the unwinding mechanism 5 may be subjected to the single-sided wet embossing by one coating unit 100 before being wound by the winding mechanism 6, and then may be transferred to another coating unit 100 by being turned over by the turning mechanism 7, and may be subjected to the other-sided wet embossing by another coating unit 100, thereby implementing the double-sided wet embossing of the substrate 2000. From this, according to the utility model discloses coating system 1000's powerful can realize two-sided wet process impression. In addition, tilting mechanism 7 can also play the effect of tensioning base member 2000 to a certain extent, improves base member 2000 and appears the fold, not hard up scheduling problem, guarantees the reliability of coating.

In the specific example shown in fig. 1, the two side surfaces of the substrate 2000 on the thickness side are the first surface and the second surface, respectively, and the two coating units 100 may be placed at different positions, and first, the substrate 2000 discharged from the unwinding mechanism 5 may have a state in which the first surface faces downward and the second surface faces upward, at which time, the first surface of the substrate 2000 located below may be wet-stamped by the coating unit 100 located at a high position, and then the substrate 2000 may be transferred to the coating unit 100 located at a low position by the turnover mechanism 7, at which time, the substrate 2000 may be turned over to have a state in which the first surface faces upward and the second surface faces downward, at which time, the second surface of the substrate 2000 located below may be wet-stamped by the coating unit 100 located at a low position, and thus, the double-sided wet-stamping of the substrate 2000 may be simply and efficiently achieved.

In some embodiments of the present invention, as shown in fig. 1, the coating system 1000 further includes a film unwinding mechanism 9, and the film unwinding mechanism 9 is configured to cover the substrate 2000 with the film 3000 when the substrate 2000 is rolled, so that the film 3000 enters the rolling mechanism 6 together with the substrate 2000. This can prevent the occurrence of a sticking phenomenon between adjacent layers after the substrate 2000 is wound, and further improve the reliability of applying the powder to the substrate 2000. The material of the film 3000 is not limited, and may be made of, for example, polyethylene terephthalate, nylon, polytetrafluoroethylene, or the like.

In some embodiments of the present invention, as shown in fig. 1, the traction unit 200 may further include a guide roller 8, etc., so as to tension the base body 2000, thereby enabling the traction unit 200 to achieve traction more stably and reliably, and preventing the base body 2000 from loosening and wrinkling during the production process.

In some embodiments of the present invention, as shown in fig. 1, the coating system 1000 of any of the above embodiments, and the coating unit 100 of any of the above embodiments, can be used to supplement lithium to the pole piece of the lithium battery, that is, the substrate 2000 is a pole piece, the material powder is lithium powder, and the material liquid is a lithium powder dispersion liquid, wherein the lithium battery can be a lithium ion battery, a lithium metal battery, a lithium air battery, a lithium sulfur battery, etc. Therefore, the uniformity, reliability and safety of lithium supplement can be improved.

With the increasing demand for long standby time of portable electronic products and the rapid development of high-power devices such as electric vehicles and electric bicycles, the demand for energy density and service life of batteries is increasing dramatically. Lithium metal has extremely high theoretical specific capacity and lowest potential, so the lithium metal secondary battery is a preferred system of the next generation of high energy density energy storage devices. However, during the first charging process of the battery, a solid electrolyte layer formed on the surface of the negative plate consumes a part of lithium, which results in lithium loss in the positive electrode material, so that the battery capacity is reduced and the first effect is reduced; or lithium and some active materials in the negative plate, such as: silicon, tin, etc. form alloys and also cause lithium loss from the positive electrode material. In order to reduce the capacity loss, the negative electrode sheet is considered to be subjected to pre-lithiation treatment, and although some pre-lithiation treatment methods exist in the related art, the methods have some disadvantages more or less and need to be improved.

For example, there are two prelithiation processes in the related art, one being the lithium foil prelithiation technique: the lithium foil is pressed and embedded on the surface of the silicon negative plate, and then the lithium foil is activated to lithiate the silicon negative plate, so that the lithiation method of the silicon negative plate for the lithium ion battery is adopted, however, due to the limitation of the thickness of mass production lithium foil, the thinnest lithium foil can only be about 3um, and the lithium amount actually provided by the lithium foil is far higher than the lithium supplement amount required by the negative plate, so that the pre-lithium of the conventional lithium foil can cause the excessive pre-lithium, the condition of lithium precipitation of the negative electrode occurs in the battery circulation process, and the circulation life and the battery safety are influenced; another is a lithium powder pre-lithium technology: the lithium powder is sprinkled on the surface of the pole piece in a vibration and static mode and then rolled, however, the method can not accurately control the supply amount of the material powder, and can also cause the uneven distribution of the lithium powder on the pole piece, and the powder flying is easy to cause to have safety risk, has great potential safety hazard and is not suitable for continuous production.

In order to solve at least one of the above technical problems, a coating system 1000 according to an embodiment of the present invention is described below. It should be noted that the coating system 1000 of the present embodiment can be used for continuously replenishing lithium powder to both sides of a pole piece, but the coating system 1000 of the present embodiment is not limited to the operation of replenishing lithium to a pole piece of a lithium battery, and other dispersion liquid coatings are also applicable.

As shown in fig. 1, the coating system 1000 includes: a drawing unit 200 and two coating units 100, the drawing unit 200 each comprising: unwinding mechanism 5, winding mechanism 6, tilting mechanism 7 and deflector roll 8, every coating unit 100 all includes: coating mechanism 1, stoving mechanism 2 and swager mechanism 3. Each coating mechanism 1 includes: the lithium ion battery comprises a material pool 11, a bonding roller 12, a press roller 13, a stirring paddle 14 and a scraping plate 15, wherein the stirring paddle 14 can uniformly stir lithium powder dispersion liquid in the material pool 11 to ensure the mixing uniformity of the lithium powder dispersion liquid, the bonding roller 12 scrapes off the redundant part through the scraping plate 15 after bonding from the material pool 11 to ensure the uniformity of the lithium powder dispersion liquid coated on a pole piece by the bonding roller 12, a gap exists between the press roller 13 and the bonding roller 12, and the press roller 13 is matched with the bonding roller 12 to provide pressure so that the lithium powder dispersion liquid on the bonding roller 12 can be reliably transferred to the surface of the pole piece.

The material sticking roller 12 is provided with a thread groove, can uniformly adsorb the lithium powder dispersion liquid through the capillary action of the thread groove, and can control the coating amount of the lithium powder through changing the depth of the thread groove, thereby controlling the pre-lithium amount of the pole piece. The adhesive roll 12 is made of high-hardness and wear-resistant alloy steel material. The adhesive roller 12 can be a plurality of adhesive rollers 12 with different thread groove depths, so that the adhesive rollers 12 can be detached and replaced for use. Thus, the amount of pre-lithium can be controlled by adjusting the concentration of the dispersion and the depth of the thread groove of the tack roll 12. The pressing mechanism 3 comprises two pressing rolls 31, a gap is formed between the two pressing rolls 31, and the two pressing rolls 31 cooperate to provide pressure to compact the lithium powder on the surface of the pole piece. The press roll 13 and the nip roll 31 are both made of alloy steel materials with smooth surfaces, low friction, high hardness and wear resistance.

As shown in fig. 1, the drying mechanism 2 performs preliminary drying on the lithium powder solution coated on the pole piece, so that rolling is performed conveniently and subsequently to prevent the roller sticking phenomenon, improve the yield, and the drying mechanism 2 can be arranged in the sealed cabin 4 to prevent the potential safety hazard caused by flying powder possibly generated in the drying process and facilitate the collection and treatment of the flying powder.

As shown in figure 1, the turnover mechanism 7 can turn over the pole piece and adjust the tension of the pole piece, prevent the pole piece from generating loose wrinkles in the production process, and is favorable for continuous double-sided lithium supplement of the pole piece. The guide roller 8 can play a role in drawing the pole piece, and adjust the tension of the pole piece, so that the pole piece is prevented from being loosened and folded in the production process. As shown in fig. 1, the film unwinding mechanism 9 is used for winding the pole piece and covering a layer of protective film to prevent the pole piece from being bonded to another layer. In addition, the operating environment of the coating system 1000 is not limited, and may be, for example: the operation requirement of a dry environment with the dew point below-40 ℃ can be as follows: the person wears the antistatic clothing, antistatic shoes, wearing mask and the like, and the detailed description is omitted here.

The specific operation of the coating system 1000 may be as follows: the pole piece is placed in the unreeling mechanism 5 and enters the first coating unit 100 under the traction of the guide rollers 8, the material sticking roller 12 in the coating mechanism 1 rotates to stick the lithium powder dispersion liquid in the material pool 11, the scraper scrapes off the redundant dispersion liquid, the lithium powder dispersion liquid is uniformly pressed on the pole piece through the uniform rotation matching of the pressing roller 13 and the material sticking roller 12, and the stirring paddle 14 in the material pool 11 always rotates at a uniform speed during the period, so that the lithium powder is uniformly dispersed in the solution. And then, the pole piece is subjected to primary drying through a drying mechanism 2 by using a solvent in the lithium powder dispersion liquid, so that the phenomenon of roller sticking in a subsequent rolling process of lithium supplement layer is prevented, and the yield is improved. After drying, the lithium powder enters a material pressing mechanism 3, and under the uniform rotation coordination of the two material pressing rollers 31, the lithium powder coated on the pole piece is compacted. Under the traction of a guide roller 8 and a turnover mechanism 7, for example, a turnover roller, the pole piece is turned over up and down to enter a second coating unit 100, and lithium supplement operation is performed on the other side of the pole piece, in the second coating unit 100, the pole piece sequentially passes through a coating mechanism 1, a drying mechanism 2 and a pressing mechanism 3, the specific process is the same as that of the first coating unit 100, and finally the pole piece enters a winding mechanism 6 under the traction of a plurality of guide rollers 8, and when the pole piece enters the winding mechanism 6, a film 3000 serving as a protective film is covered on the surface of the pole piece by a film distributing and unwinding mechanism 9 and enters the winding mechanism 6 together.

Therefore, according to the coating system 1000 of the embodiment, the continuous double-sided lithium supplement operation can be performed on the pole piece, the lithium powder dispersion liquid is coated on the surface of the pole piece in a wet-process imprinting mode, the drying mechanism 2 with the semi-closed sealed cabin 4 is provided, the safety problem caused by powder flying in the dry-process coating process is avoided, the lithium powder dispersion liquid is easier to disperse uniformly relative to the dry powder, so the coating is more uniform, in addition, the pre-lithium amount can be controlled by adjusting the concentration of the dispersion liquid and the depth of the thread groove of the adhesive roller 12, and the pre-lithium control system is superior to the lithium foil pre-lithium technology. In short, according to the utility model discloses coating system 1000 can realize lithium in advance more simply effectively to ensure the security in preparation process, the controllability of lithium volume and the homogeneity that the lithium source distributes on the pole piece in advance can guarantee accurate ration of lithium powder, homodisperse and safety, and can realize that the two-sided lithium powder of pole piece of serialization production is lithium in advance.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coating unit (100), comprising:

the coating mechanism (1) comprises a material pool (11), a bonding roller (12) and a pressing roller (13), wherein the pressing roller (13) is opposite to the bonding roller (12) and is arranged at a gap, so that a substrate (2000) to be coated is suitable for passing between the pressing roller (13) and the bonding roller (12), and at least part of the bonding roller (12) is positioned in the material pool (11) so as to take out the material liquid in the material pool (11) and coat the material liquid on the substrate (2000) when rolling;

the drying mechanism (2) is arranged at the downstream of the coating mechanism (1), and is used for drying the feed liquid coated on the substrate (2000) into powder; and

the pressing mechanism (3) is arranged at the downstream of the drying mechanism (2) and is used for compacting the dried powder on the base body (2000).

2. The coating unit (100) according to claim 1, wherein said coating means (1) comprises:

the stirring paddle (14) is positioned in the material pool (11) and is used for stirring the material liquid in the material pool (11).

3. The coating unit (100) according to claim 1, wherein said coating means (1) comprises:

and the scraping plate (15) is matched with the bonding roller (12), and is used for scraping off the redundant feed liquid on the bonding roller (12) before the bonding roller (12) coats the feed liquid on the substrate (2000).

4. The coating unit (100) according to claim 3, wherein one end of the scraper plate (15) is mounted to the material basin (11), and the other end of the scraper plate (15) extends towards the direction of the gluing roller (12) and is used for scraping.

5. The coating unit (100) according to claim 1, characterized in that said glue roll (12) has a threaded groove thereon.

6. The coating unit (100) according to claim 1, wherein said nip mechanism (3) comprises:

two nip rolls (31), the two nip rolls (31) being disposed opposite to each other with a gap therebetween so that the substrate (2000) is adapted to pass between the two nip rolls (31).

7. The coating unit (100) according to any one of claims 1-6, wherein the coating unit (100) comprises:

a sealed cabin (4), sealed cabin (4) have entry and export, the entry is suitable for base member (2000) gets into sealed cabin (4), the export is suitable for base member (2000) move out sealed cabin (4), stoving mechanism (2) are located in sealed cabin (4), with in sealed cabin (4) right feed liquid on the base member (2000) is dried.

8. A coating system (1000), comprising:

the traction unit (200) comprises an unwinding mechanism (5) and a winding mechanism (6), and the substrate (2000) is unwound by the unwinding mechanism (5) and wound by the winding mechanism (6);

-at least one coating unit (100), said coating unit (100) being a coating unit (100) according to any one of claims 1 to 7 and being located downstream of said unwinding mechanism (5) and upstream of said winding mechanism (6).

9. The coating system (1000) according to claim 8, wherein said coating system (1000) comprises two of said coating units (100), said drawing unit (200) further comprising:

the turnover mechanism (7) is positioned between the two coating units (100), so that the coating unit (100) at the upstream of the turnover mechanism (7) coats the surface of one side of the thickness of the substrate (2000), and the coating unit (100) at the downstream of the turnover mechanism (7) coats the surface of the other side of the thickness of the substrate (2000).

10. The coating system (1000) according to claim 8 or 9, wherein the coating system (1000) is configured to supplement lithium to a pole piece of a lithium battery, the substrate (2000) is a pole piece, the powder is lithium powder, and the coating system (1000) further comprises:

the cloth film unwinding mechanism (9) is used for covering the base body (2000) with the film (3000) when the base body (2000) is wound, so that the film (3000) and the base body (2000) enter the winding mechanism (6) together.