Coating system

Abstract

The utility model relates to the technical field of battery current collector preparation, in particular to a coating system which comprises a storage container, a circulating pump, a trough, a gravure roller and a scraper mechanism. Wherein a backflow area and an infiltrating area which are separated from each other are formed in the trough, the gravure roller is arranged above the infiltrating area, and the infiltrating area is used for containing slurry, so that the gravure roller can be infiltrated in the slurry; the scraper mechanism is arranged on the roller surface side of the gravure roller and used for scraping part of slurry on the roller surface of the gravure roller, and the backflow area is used for receiving the slurry scraped by the scraper mechanism; a feed port, a discharge port and a reflux port are formed in the storage container, the discharge port is communicated with the circulating pump through a pipeline, and the circulating pump is communicated with the infiltration area through a pipeline; the backflow area is communicated with the backflow port of the storage container through a pipeline. According to the novel coating system provided by the invention, the trough with the grids and the circulating system are arranged, and the double blade coating mechanisms are matched, so that the effects of defoaming at a high speed and reducing dry materials are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of battery current collector preparation, and in particular to a coating system. Background Art

[0002] Currently, carbon-coated aluminum foil is commonly used as a battery current collector, reducing interfacial contact impedance, lowering battery internal resistance, and alleviating internal polarization, thereby improving the battery's discharge rate. The presence of a carbon coating increases the surface roughness of the aluminum foil, increasing surface tension and reducing the wetting angle, ensuring good wetting between the slurry and the current collector during coating, increasing the contact points between the current collector and the active material, and enhancing adhesion.

[0003] Currently, carbon-coated aluminum foil is commonly produced at high speed and continuously using gravure coating. Typically, a gravure roller is immersed in a trough containing conductive slurry and rotates along with a drive shaft. After being coated by a fixed scraper, the slurry is impressed onto the surface of the foil before being dried and wound up. During high-speed coating, the gravure roller rotates at high speed within the trough, creating a thick layer of slurry on the roller surface. After being coated by the scraper, the slurry layer easily entraps air as it falls back into the trough, forming bubbles and foam. This results in an uneven carbon coating. Thick slurry layers are also prone to entraining dry materials, impurities, and agglomerates, which can become trapped between the scraper and the gravure roller, causing scratches on the carbon coating and even wear on the gravure groove lines. Utility Model Content

[0004] The purpose of this application is to provide a coating system, which to a certain extent solves the technical problems existing in the prior art that when the gravure roller is coated, the gravure roller is immersed in the material tank and rotates at high speed, and a thicker slurry layer is attached to the roller surface. After being scraped by the scraper, the material layer is easily drawn into the air and forms bubbles and foams in the process of falling back into the material tank, resulting in uneven carbon coating layer. The thicker slurry layer is also easy to entrain dry materials, impurities, agglomerates, etc., which are easily sandwiched between the scraper and the gravure roller and cause scratching of the carbon coating layer and even wear of the gravure groove line.

[0005] The present application provides a coating system, comprising: a storage container, a circulation pump, a material tank, a gravure roller, and a scraper mechanism; wherein the material tank is formed with a recirculation zone and an infiltration zone separated from each other, the gravure roller is arranged above the infiltration zone, and the infiltration zone is used to hold slurry so that the gravure roller can be immersed in the slurry;

[0006] The scraper mechanism is arranged on the roller surface side of the gravure roller and is used to scrape off part of the slurry on the roller surface of the gravure roller. The reflux zone is used to receive the slurry scraped off by the scraper mechanism. The storage container is formed with a feed port, a discharge port and a reflux port, and the discharge port is connected to the circulation pump via a pipeline, and the circulation pump is connected to the infiltration zone via a pipeline; the reflux zone is connected to the reflux port of the storage container via a pipeline.

[0007] In the above technical solution, further, at least one of the scraper mechanisms includes a blade holder, a scraper, a fixing member, and a fixing nut; wherein the scraper is mounted on the blade holder, and one of the blade holder and the target mounting location is provided with a waist-shaped hole, and the waist-shaped hole extends in a direction forming an angle with the radial direction of the gravure roller, and the other is provided with a circular hole;

[0008] The fixing component is installed in the waist-shaped hole and the circular hole in sequence, and both ends of the fixing component exposed from the waist-shaped hole and the circular hole are formed with threads, and are respectively locked by the fixing nuts on both sides to fix the tool holder and the target installation site together.

[0009] In any of the above technical solutions, further, the tool holder includes a first clamping member, a second clamping member, a locking bolt, and a locking nut; wherein a first mounting through hole is formed at one end of the first clamping member, and the first clamping member is sleeved on the fixing member through the first mounting through hole;

[0010] A second mounting through hole is formed at one end of the second clamping member, and the second clamping member is sleeved on the fixing member through the second mounting through hole; the scraper is clamped between the first clamping member and the second clamping member, and the first clamping member and the second clamping member are locked and fixed by the locking bolt and the locking nut.

[0011] In any of the above technical solutions, further, at least one of the scraper mechanisms also includes a baffle, and the baffle is arranged on the side of the target installation site away from the blade holder, and the baffle blocks the waist-shaped hole, and the threaded end of the fixing member passes through the through hole on the baffle and is threadedly connected to the fixing nut.

[0012] In any of the above technical solutions, further, the waist-shaped hole extends along a radial direction perpendicular to the gravure roller.

[0013] In any of the above technical solutions, further, along the rotation direction of the gravure roller, the scraper mechanism that the gravure roller first passes through after picking up the slurry in the immersion area of ​​the material tank is arranged in the reflux area of ​​the material tank.

[0014] In any of the above technical solutions, further, the material trough is a rectangular trough, and the reflow zone and the infiltration zone are both arranged along the length direction of the material trough.

[0015] In any of the above technical solutions, further, the length of the short side of the trough is 250-500 mm, and the length of the long side of the trough is 700-1500 mm;

[0016] The length of the short side of the reflow zone is 50 to 120 mm, and the length of the short side of the wetting zone is 30 to 50 mm greater than the diameter of the gravure roller.

[0017] In any of the above technical solutions, further, the reflow zone is a rectangular area, and two edges of the reflow zone away from the wetting zone are formed with rounded corners, and the radius of the rounded corners is 50 to 150 mm.

[0018] In any of the above technical solutions, further, the infiltration zone is a rectangular area, and the two edges of the infiltration zone away from the reflow zone are formed with elliptical fillets, and the length of the short axis of the elliptical fillet is 1 / 6 to 1 / 4 of the length of the short side of the material trough, and the length of the long axis of the elliptical fillet is 1 / 5 to 1 / 3 of the length of the long side of the material trough.

[0019] In any of the above technical solutions, further, the coating system also includes a filtering device, which is arranged on the pipeline connecting the circulation pump and the discharge port of the storage container and / or the pipeline connecting the circulation pump and the immersion area of ​​the material tank.

[0020] In any of the above technical solutions, further, the coating system also includes a reflux baffle, and the reflux baffle is arranged above the reflux area of ​​the material trough and is located on the side of the scraper mechanism away from the gravure roller, for shielding the slurry.

[0021] In any of the above technical solutions, further, the material trough includes a trough body and a partition plate connected to each other, and the partition plate is arranged in the trough body to separate the interior of the trough body into a reflow area and an infiltration area; the partition plate is formed by a flexible material that has been coated with glue.

[0022] In any of the above technical solutions, further, an outlet is formed on the side wall of the reflux zone, and the outlet is connected to the reflux port of the storage container via a pipeline.

[0023] In any of the above technical solutions, further, an inlet is formed on the side wall of the immersion area, and the inlet is connected to the circulation pump via a pipeline.

[0024] In any of the above technical solutions, further, the feed port and the discharge port are respectively formed on opposite sides of the storage container near the top thereof, and the reflux port is formed at the bottom of the storage container.

[0025] In any of the above technical solutions, further, the material of the material trough is stainless steel or painted steel plate.

[0026] In any of the above technical solutions, further, the storage container is a stirring tank.

[0027] In any of the above technical solutions, further, the reflux port is arranged below the reflux zone, and / or the coating system further includes a delivery pump, and the pipeline connecting the reflux port and the immersion zone passes through the delivery pump.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The present application provides a novel coating system equipped with a compartmentalized material trough and a circulation system. The slurry after being scraped by the scraper mechanism will enter the reflux area and be recycled through the circulation system to achieve the effect of defoaming and reducing dry material at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 A schematic diagram of the structure of the coating system provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of the feed trough provided in an embodiment of the present application;

[0033] Figure 3 A schematic structural diagram of a primary scraper mechanism provided in an embodiment of the present application;

[0034] Figure 4 Another structural schematic diagram of the primary scraper mechanism provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 1-storage container, 11-feed port, 12-discharge port, 13-reflux port, 2-circulation pump, 3-material trough, 31-trough body, 32-partition plate, 33-infiltration area, 34-reflux area, 35-inlet, 36-outlet, 37-waist-shaped hole, 4-gravure roller, 5-scraper mechanism, 51-primary scraper mechanism, 511-blade holder, 5111-first clamping member, 5112-second clamping member, 5113-locking bolt, 512-scraper, 513-fixing member, 514-fixing nut, 515-baffle, 52-secondary scraper mechanism, 6-filtering device, 7-reflux baffle, 8-scraped slurry. DETAILED DESCRIPTION

[0037] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0038] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0039] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0040] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0042] Refer to the following Figures 1 to 4 The coating system according to some embodiments of the present application is described.

[0043] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a coating system, comprising: a storage container 1, a circulation pump 2, a material tank 3, a gravure roller 4, and a scraper mechanism 5; wherein the material tank 3 is formed with a recirculation zone 34 and an infiltration zone 33 separated from each other, the gravure roller 4 is arranged above the infiltration zone 33, and the infiltration zone 33 is used to hold slurry so that the gravure roller 4 can be immersed in the slurry;

[0044] The scraper mechanism 5 is arranged on the roller surface side of the gravure roller 4, and is used to scrape off part of the slurry on the roller surface of the gravure roller 4. The reflux zone 34 is used to receive the slurry scraped off by the scraper mechanism 5; the storage container 1 is formed with a feed port 11, a discharge port 12 and a reflux port 13, and the discharge port 12 is connected to the circulation pump 2 via a pipeline, and the circulation pump 2 is connected to the infiltration zone 33 via a pipeline; the reflux zone 34 is connected to the reflux port 13 of the storage container 1 via a pipeline.

[0045] According to the structure described above, the working process of the coating system provided by this application is as follows:

[0046] During gravure coating, the conductive paste is pumped into the storage container 1 from the feed port 11, and the conductive paste is sent from the discharge port 12 through the pipeline by the circulation pump 2 to the filtering device 6 described below, and then enters the material tank 3 after filtration;

[0047] The conductive paste in the wetted area 33 of the trough 3 rotates with the gravure roller 4, forming a thick paste layer attached to the surface of the gravure roller 4. After the thick paste layer is scraped by the scraper mechanism 5, a gravure layer of a preset thickness is formed. The excess paste scraped off is affected by the high-speed rotation of the lower line and falls along the lower edge of the primary scraper 512 into the reflow area 34 of the trough 3.

[0048] The conductive slurry in the reflux zone 34 flows back into the storage container 1 from the discharge port 12 of the material tank 3 through the pipeline, the reflux port 13 and the inner wall of the storage container 1, forming a slurry circulation.

[0049] It can be seen that the present application provides a new coating system, which is equipped with a compartmented material trough 3 and a circulation system. The slurry after being scraped by the scraper mechanism 5 will enter the reflux area 34 and be recycled through the circulation system to achieve the effect of defoaming and reducing dry material at high speed.

[0050] Furthermore, preferably, the circulation pump 2 is preferably a peristaltic pump or a small-flow diaphragm pump, so that the conductive slurry can enter the material tank 3 at a low speed, continuously and stably, thereby reducing the generation of jets.

[0051] Furthermore, preferably, the filter element of the filter device 6 is preferably a replaceable disposable filter element with a mesh size of 150 to 300 meshes.

[0052] Furthermore, preferably, an outlet 36 is formed on the side wall of the reflux zone 34 , and the outlet 36 is communicated with the reflux port 13 of the storage container 1 via a pipeline.

[0053] Furthermore, preferably, an inlet 35 is formed on the side wall of the wetting area 33 , and the inlet 35 is connected to the circulation pump 2 via a pipeline.

[0054] Further, preferably, the feed port 11 and the discharge port 12 are respectively formed on opposite sides of the storage container 1 near the top thereof, and the reflux port 13 is formed at the bottom of the storage container 1. Of course, it is not limited thereto and can be designed according to actual needs.

[0055] In this embodiment, preferably, Figure 1 As shown, there are multiple scraper mechanisms 5 , and the multiple scraper mechanisms 5 are sequentially arranged along the rotation direction of the gravure roller 4 , and at least a portion of the scraper mechanisms 5 are arranged corresponding to the reflow zone 34 side.

[0056] According to the structure described above, compared with the prior art which uses a single scraping structure to scrape off a thicker slurry, the present application uses multiple scraper mechanisms 5 to scrape off the slurry on the roller surface of the platen roller, so that the thickness of the slurry layer scraped off each time is thinner, and thus no air will be drawn in, and no bubbles or foam will be formed, thereby ultimately ensuring the uniformity of the thickness of the carbon coating layer.

[0057] Furthermore, preferably, the number of scraper 512 components is two. For the sake of convenience in distinguishing, one of them is named the primary scraper mechanism 51, and the other is named the secondary scraper mechanism 52. Along the rotation direction of the gravure roller 4, the primary scraper mechanism 51 is arranged in front of the secondary scraper mechanism 52, so that the gravure roller 4 after picking up the slurry in the wetting area 33 of the material trough 3 first passes through the primary scraper mechanism 51, and then passes through the secondary scraper mechanism 52; the primary scraper mechanism 51 and the secondary scraper mechanism 52 are both arranged close to the side of the reflow area 34, and this will be used as an example to illustrate later. Of course, the number of scraper mechanisms 5 is not limited to this, and can also be greater than two, such as three, four or five, etc., and is specifically designed according to actual needs. The number of scraper mechanisms 5 can also be less than two, such as one, and is specifically selected according to actual needs.

[0058] In this embodiment, preferably, Figure 3 and Figure 4 As shown, the primary scraper mechanism 51 includes a blade holder 511, a scraper 512, a fixing member 513 and a fixing nut 514; wherein the scraper 512 is mounted on the blade holder 511, and one of the blade holder 511 and the target installation site is provided with a waist-shaped hole 37, and the waist-shaped hole 37 extends in a direction forming an angle with the radial direction of the gravure roller 4, and the other is provided with a circular hole; the fixing member 513 is sequentially installed in the waist-shaped hole 37 and the circular hole, and both ends of the fixing member 513 exposed to the waist-shaped hole 37 and the circular hole are formed with threads, and are respectively locked by the fixing nuts 514 on both sides to fix the blade holder 511 and the target installation site together. It should be noted that: Figure 3 The scraped slurry 8 is shown in FIG. 5 , that is, both sides of the scraper 512 and certain areas on the gravure roller 4 are scraped with slurry 8 .

[0059] According to the structure described above, it can be known that the position of the fixing component 513 in the waist-shaped hole 37 can be adjusted according to actual needs, and then the distance between the scraper 512 and the roller surface of the gravure roller 4 can be adjusted to meet different usage requirements. Moreover, the above structure is relatively convenient to adjust. It is only necessary to loosen the fixing nut 514 to adjust the position of the fixing component 513 in the waist-shaped hole 37. When the adjustment is completed, it is only necessary to tighten the fixing nut 514. The operation is simple and convenient, saving time and effort, and improving production efficiency.

[0060] Further, preferably, along the rotation direction of the gravure roller 4, the scraper mechanism 5 that the gravure roller 4 first passes through after picking up the slurry in the immersion area of ​​the material trough 3 is arranged in the reflux area 34 of the material trough 3, that is, the primary scraper mechanism 51 is arranged in the reflux area 34 of the material trough 3, and the primary scraper mechanism 51 is directly connected to the side wall of the material trough 3, then the aforementioned target installation place is the side wall of the material trough 3, or the primary scraper mechanism 51 is connected to the side wall of the material trough 3 through the mounting seat, that is, the mounting seat can be fixed on the side wall of the material trough 3, and the primary scraper mechanism 51 is connected to the mounting seat, then the target installation place at this time is the mounting seat. Of course, it is not limited to this, and other structures can also be used. For example, the mounting seat can be fixed on the bottom wall of the material trough 3, and the specific selection is based on actual needs.

[0061] Furthermore, preferably, the waist-shaped hole 37 extends perpendicular to the radius of the gravure roller 4. Of course, it is not limited to this. The extension direction of the waist-shaped hole 37 can also form an acute angle or an obtuse angle with the radius of the gravure roller 4, etc., which can be selected according to actual needs.

[0062] Furthermore, preferably, the scraper mechanism 5 also includes a baffle 515, and the baffle 515 is arranged on the side of the target installation site away from the knife seat 511, and the baffle 515 blocks the waist-shaped hole 37, and the threaded end of the fixing member 513 passes through the through hole on the baffle 515 and is threadedly connected to the fixing nut 514 to improve the locking and fixing effect. Of course, this baffle 515 may not be provided, and the specific selection is based on actual needs.

[0063] Furthermore, preferably, in order to ensure the locking effect of the fixing member 513 and the fixing nut 514, a locking washer can also be provided, which can be selected according to actual needs.

[0064] It should be noted that the secondary scraper 512 in this embodiment adopts the scraper 512 equipped with the existing gravure roller 4, so it will not be described in detail. Of course, it is not limited to this. The secondary scraper mechanism 52 can also be designed into the aforementioned structure. That is to say, for multiple scraper mechanisms 5, a part of them can be selected to be designed with the same structure as the aforementioned primary scraper mechanism 51, and the other part of the scraper mechanism 5 adopts the inherent scraper 512 structure equipped with the gravure roller 4 in the prior art, or all scraper mechanisms 5 adopt the structure of the aforementioned primary scraper mechanism 51, and the specific selection is based on actual needs.

[0065] In this embodiment, preferably, Figure 3 As shown, the blade holder 511 includes a first clamping member 5111, a second clamping member 5112, a locking bolt 5113, and a locking nut; wherein a first mounting through hole is formed at one end of the first clamping member 5111, and the first clamping member 5111 is sleeved on the fixing member 513 through the first mounting through hole;

[0066] A second mounting through hole is formed at one end of the second clamping member 5112, and the scraper 512 is mounted on the fixing member 513 through the second mounting through hole; the scraper 512 is clamped between the first clamping member 5111 and the second clamping member 5112, and the first clamping member 5111 and the second clamping member 5112 are fastened and fixed by a locking bolt 5113 and a locking nut.

[0067] According to the structure described above, it can be seen that the blade holder 511 provided in the present application is a detachable structure. When the scraper 512 needs to be replaced, it is only necessary to remove the locking bolt 5113 and the locking nut, open the first clamping member 5111 and the second clamping member 5112, and then take out the scraper 512, and then repair or replace the scraper 512. When the repair or replacement is completed, the scraper 512 can be reinstalled between the first clamping member 5111 and the second clamping member 5112, and can be locked and fixed by the aforementioned locking bolt 5113 and locking nut, which is simple and convenient to operate.

[0068] It should be noted that the structure of the knife holder 511 is not limited to the above-mentioned detachable structure, and other structures may be selected according to actual needs, for example, a non-detachable knife holder 511 structure may be selected.

[0069] In this embodiment, preferably, Figure 2 As shown, the material trough 3 is a rectangular trough, and the reflow area 34 and the infiltration area 33 are both arranged along the length direction of the material trough 3. The shape is regular, which is convenient for processing, manufacturing and use.

[0070] In this embodiment, preferably, Figure 2As shown, the length L1 of the short side of the trough 3 is 250 to 500 mm, and the length L2 of the long side of the trough 3 is 700 to 1500 mm.

[0071] According to the structure described above, it can be seen that the material trough 3 with the above-mentioned size meets the wetting requirement of the gravure roller 4 and can also receive the slurry scraped off by the scraper mechanism 5 .

[0072] Further, preferably, Figure 2 As shown, the reflow zone 34 is a rectangular area, and the two edges of the reflow zone 34 away from the wetting zone 33 are formed with rounded corners, and the radius R1 of the rounded corners is 50 to 150 mm; the length L3 of the short side of the reflow zone 34 is 50 to 120 mm, and the length L4 of the short side of the wetting zone 33 is greater than the diameter of the gravure roller 4 by 30 to 50 mm.

[0073] According to the structure described above, the rounded corners of the recirculation zone 34, i.e., the small rounded corners, are designed to reduce the flow dead zone in the recirculation zone 34 while ensuring compatibility with the scraper 512 and the gravure roller 4, thereby reducing the generation and accumulation of dry materials.

[0074] Further, preferably, Figure 2 As shown, the wetting area 33 is a rectangular area, and the two edges of the wetting area 33 away from the reflow area 34 are formed with elliptical fillets, and the length L5 of the short axis of the elliptical fillet is 1 / 6 to 1 / 4 of the length of the short side of the material trough 3, and the length of the long axis of the elliptical fillet is 1 / 5 to 1 / 3 of the length L6 of the long side of the material trough 3.

[0075] According to the structure described above, the design purpose of the elliptical fillet of the wetting area 33, that is, the large fillet, is: on the one hand, while ensuring compatibility with the scraper 512 and the gravure roller 4, it greatly reduces the flow dead zone in the wetting area 33, thereby reducing the generation and accumulation of dry material; on the other hand, it cooperates with the flow generated by the rotation of the gravure roller 4 to make the conductive slurry entering through the feed port 11 more fully mixed, thereby ensuring the uniformity of the slurry in the wetting area 33 and improving the uniformity of the scraping.

[0076] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the material tank 3 includes a tank body 31 and a partition plate 32 connected to each other, and the partition plate 32 is disposed in the tank body 31 to separate the interior of the tank body 31 into a reflow area 34 and a wetting area 33 .

[0077] Furthermore, preferably, the material of the trough 3 is stainless steel such as 304 or painted steel plate, which has corrosion resistance.

[0078] Furthermore, preferably, the partition plate 32 is formed of a flexible material such as rubber or plastic that has been coated with rubber to prevent the partition plate 32 from colliding with the gravure roller 4 and causing damage or defects to the roller surface.

[0079] In this embodiment, preferably, Figure 1 As shown, the coating system further includes a filtering device 6, which is provided on a pipeline connecting the circulation pump 2 and the infiltration area 33 of the material tank 3, and plays a role in filtering impurities to ensure uniformity of coating.

[0080] Of course, this is not limited to the above. A filter device 6 may be provided on the pipeline connecting the circulation pump 2 and the discharge port 12 of the storage container 1, or a filter device 6 may be provided on the pipeline connecting the circulation pump 2 and the discharge port 12 of the storage container 1 and / or on the pipeline connecting the circulation pump 2 and the infiltration area 33 of the material tank 3 at the same time. The specific selection is based on actual needs.

[0081] In this embodiment, preferably, Figure 4 As shown, the coating system also includes a reflux baffle 7, and the reflux baffle 7 is arranged above the reflux area 34 of the material trough 3, and is located on the side of the scraper mechanism 5 away from the gravure roller 4, for shielding the slurry and ensuring that the scraped slurry can fall back into the reflux area 34 of the material trough 3. Of course, this reflux baffle 7 cannot be set, and it can be selected according to actual needs.

[0082] In this embodiment, preferably, Figure 1 As shown, the storage container 1 is a stirring tank, that is, the storage container 1 is equipped with a driving motor and a stirring paddle, and the stirring paddle is provided with a stirring blade for stirring the slurry, which can further remove bubbles and make the slurry uniform, thereby improving the coating effect.

[0083] Of course, the present invention is not limited thereto. The storage container 1 may also be an ordinary tank without a stirring structure, and the specific selection is based on actual needs.

[0084] In this embodiment, preferably, Figure 1 As shown, the reflux port 13 is provided below the reflux zone 34, and preferably on the lower side, using gravity as a power source to transport the slurry in the reflux zone 34 to the storage container 1. Of course, this is not limited to this. A delivery pump can also be provided on the pipeline connecting the reflux port and the immersion zone to provide power. In summary, the detailed working process of the coating system provided by this application is as follows:

[0085] During gravure coating, the conductive slurry is pumped into the storage container 1 through the feed port 11 and stirred and buffered. The conductive slurry is then fed from the discharge port 12 through the pipeline by the circulation pump 2 into the filtering device 6 described below, and then enters the material tank 3 after filtration.

[0086] The conductive paste in the wetted area 33 of the trough 3 rotates with the gravure roller 4, forming a thick paste layer attached to the surface of the gravure roller 4. The thick paste layer is scraped by the primary scraper 512 with adjustable position and angle described below to form a thin paste layer a of 0.5 to 3 mm. The excess paste scraped off is affected by the high-speed rotation of the lower line and falls along the lower edge of the primary scraper 512 into the reflow area 34 of the trough 3.

[0087] After the thin slurry layer rotates with the gravure plate, it is scraped by the secondary scraper 512 on the coating machine, which is close to the gravure roller 4, to form a gravure layer (its thickness is usually 0.2-2 μm). After scraping, the excess slurry flows along the lower edge of the machine scraper 512, the reflux baffle 7 and the upper edge of the primary scraper 512 into the reflux area 34 of the trough 3;

[0088] The conductive slurry in the reflux zone 34 flows back into the storage container 1 from the discharge port 12 of the material tank 3 through the pipeline, the reflux port 13 and the inner wall of the storage container 1, forming a slurry circulation.

[0089] It can be seen that the novel coating system provided in the present application is equipped with a compartmented material trough 3 and a circulation system, and is combined with a double scraping mechanism to achieve the effects of defoaming and reducing dry material at high speed.

[0090] In combination with the above, a comparative experiment was conducted. Specifically, in experiment 1, the same manufacturer and the same batch of water-based conductive slurry were used. On a double-layer gravure coating machine, the two material troughs provided by the coating machine and the material trough 3 provided in this application were used respectively. The density and morphology of the gravure grooves on the A and B sides of the gravure roller 4 were consistent. The depth of the gravure grooves on the A side was 2 μm, and the depth of the grooves on the B side was 3 μm. Under the same slurry screening, circulation system, oven parameters and the same batch of aluminum foil (that is, one group of the two experiments used this coating system, and the other group only replaced the material trough 3 in the coating system with the material trough in the prior art), the thickness of each double-sided carbon-coated aluminum foil was 300 μm. The carbon-coated aluminum foil obtained using the material trough provided by the coating machine was recorded as Group A, and the carbon-coated aluminum foil obtained using the material trough 3 provided by this design was recorded as Group B. Samples were taken every 30 m to measure the thickness of the carbon coating layer on the A and B sides and the impedance of the double-sided carbon-coated aluminum foil. Comparative test data: The thickness of both sides A and B in Group B is closer to the groove depth than that in Group A, and the impedance fluctuation in Group B is smaller than that in Group A. The data shows that the carbon-coated aluminum foil produced in trough 3 using the double scraper 512 has a thickness closer to the groove depth of the gravure, with less impedance fluctuation and better uniformity.

[0091]

[0092] Experiment 2: On a double-layer gravure coating machine, using water-based conductive slurry from the same manufacturer and the same batch, the density, morphology and depth of the gravure grooves on the A and B sides of the gravure roller 4 are consistent. The A side uses the material trough provided by the coating machine and does not use a screening or circulation system. The B side uses the secondary scraper mechanism 52, the gridded material trough 3 and the circulation system provided by this design, that is, this system is used. Under the same oven parameters and the same batch of aluminum foil, double-sided carbon-coated carbon-coated aluminum foil is continuously prepared for 4 hours at a speed of 50m / min. A roll of double-sided carbon-coated aluminum foil is produced every 0.5 hours. The double-sided carbon coating layer of the core, middle and outer ring of each roll of carbon-coated aluminum foil is obtained by rewinding, and the appearance defects of the carbon coating layers on the A and B sides are compared. Among them, group A is recorded as the appearance of the carbon coating layer on the A side, and group B is recorded as the appearance of the carbon coating layer on the B side.

[0093] Comparative test data: The carbon-coated aluminum foil produced using the dual-scraper circulation system, or trough 3 of this system, exhibits essentially no dry material, streaks, or bubbles. These results demonstrate that the dual-scraper circulation system provided by this design, or trough 3 of this system, effectively reduces dry material and bubble issues during the continuous production of carbon-coated aluminum foil, contributing to an improved carbon coating surface.

[0094]

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coating system, characterized in that: include: A storage container, a circulation pump, a material tank, a gravure roller, and a scraper mechanism; wherein the material tank is formed with a reflux zone and an infiltration zone separated from each other, the gravure roller is arranged above the infiltration zone, and the infiltration zone is used to hold the slurry so that the gravure roller can be immersed in the slurry; The scraper mechanism is arranged on the roller surface side of the gravure roller and is used to scrape off part of the slurry on the roller surface of the gravure roller. The reflux zone is used to receive the slurry scraped off by the scraper mechanism. The storage container is formed with a feed port, a discharge port and a reflux port, and the discharge port is connected to the circulation pump via a pipeline, and the circulation pump is connected to the infiltration zone via a pipeline; the reflux zone is connected to the reflux port of the storage container via a pipeline.

2. The coating system according to claim 1, characterized in that There are multiple scraper mechanisms, and the multiple scraper mechanisms are arranged in sequence along the rotation direction of the gravure roller, and at least a part of the scraper mechanisms are arranged corresponding to the reflow zone side.

3. The coating system according to claim 2, characterized in that At least one of the scraper mechanisms includes a blade holder, a scraper, a fixing member, and a fixing nut; wherein the scraper is mounted on the blade holder, and one of the blade holder and the target mounting location is provided with a waist-shaped hole, and the waist-shaped hole extends in a direction forming an angle with the radial direction of the gravure roller, and the other is provided with a circular hole; The fixing component is installed in the waist-shaped hole and the circular hole in sequence, and both ends of the fixing component exposed from the waist-shaped hole and the circular hole are formed with threads, and are respectively locked by the fixing nuts on both sides to fix the tool holder and the target installation site together.

4. The coating system according to claim 3, characterized in that The tool holder includes a first clamping member, a second clamping member, a locking bolt, and a locking nut; wherein a first mounting through hole is formed at one end of the first clamping member, and the first clamping member is sleeved on the fixing member through the first mounting through hole; A second mounting through hole is formed at one end of the second clamping member, and the scraper is sleeved on the fixing member through the second mounting through hole; the scraper is clamped between the first clamping member and the second clamping member, and the first clamping member and the second clamping member are locked and fixed by the locking bolt and the locking nut; and / or At least one of the scraper mechanisms further comprises a baffle, and the baffle is arranged on a side of the target installation site away from the blade holder, and the baffle blocks the waist-shaped hole, and the threaded end of the fixing member passes through the through hole on the baffle and is threadedly connected to the fixing nut; and / or The waist-shaped holes extend along a radial direction perpendicular to the gravure roller.

5. The coating system according to claim 2, characterized in that Along the rotation direction of the gravure roller, the scraper mechanism that the gravure roller first passes through after picking up the slurry in the immersion area of ​​the material tank is arranged in the reflux area of ​​the material tank.

6. The coating system according to claim 1, characterized in that The material trough is a rectangular trough, and the reflow zone and the infiltration zone are both arranged along the length direction of the material trough.

7. The coating system according to claim 6, characterized in that The length of the short side of the trough is 250-500 mm, and the length of the long side of the trough is 700-1500 mm; The length of the short side of the reflow zone is 50 to 120 mm, and the length of the short side of the wetting zone is 30 to 50 mm greater than the diameter of the gravure roller.

8. The coating system according to claim 7, characterized in that The reflow zone is a rectangular area, and two edges of the reflow zone away from the wetting zone are formed with rounded corners, and the radius of the rounded corners is 50-150 mm.

9. The coating system according to claim 7, characterized in that The infiltration zone is a rectangular area, and the two edges of the infiltration zone away from the reflow zone are formed with elliptical fillets, and the length of the short axis of the elliptical fillet is 1 / 6 to 1 / 4 of the length of the short side of the material trough, and the length of the long axis of the elliptical fillet is 1 / 5 to 1 / 3 of the length of the long side of the material trough.

10. The coating system according to any one of claims 1 to 9, characterized in that The coating system further comprises a filtering device, which is provided on a pipeline connecting the circulation pump and the discharge port of the storage container and / or a pipeline connecting the circulation pump and the immersion area of ​​the material tank; and / or The coating system further includes a reflux baffle, and the reflux baffle is arranged above the reflux area of ​​the material trough and located on the side of the scraper mechanism away from the gravure roller, for shielding the slurry; and / or The material trough includes a trough body and a partition plate connected to each other, and the partition plate is arranged in the trough body to separate the interior of the trough body into a reflow area and an infiltration area; the partition plate is formed by a flexible material that has been coated with rubber; and / or An outlet is formed on a side wall of the reflux zone, and the outlet is connected to the reflux port of the storage container via a pipeline; and / or An inlet is formed on a side wall of the immersion zone, and the inlet is connected to the circulation pump via a pipeline; and / or The feed port and the discharge port are respectively formed on opposite sides of the storage container near the top thereof, and the reflux port is formed at the bottom of the storage container; and / or The material of the trough is stainless steel or painted steel plate; and / or The storage container is a stirred tank; and / or The reflux port is arranged below the reflux zone, and / or the coating system further comprises a delivery pump, and the pipeline connecting the reflux port and the immersion zone passes through the delivery pump.

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