Drying device for preventing pole piece coating from cracking

Abstract

The drying device capable of preventing the pole piece coating from cracking comprises a box body and a second drying device, a first drying device and a conveying device are arranged in the box body, the first drying device is connected with a heat source, the heat source is provided with an air inlet valve, and the air inlet valve controls the air outlet amount of the first drying device. The second drying device is connected with the cold source and is arranged close to the output end of the conveying device, the conveying device is used for conveying battery pole pieces coated with coatings, the first drying device is used for incompletely drying the coatings, the second drying device is used for thoroughly drying the coatings, and the coatings are incompletely dried in a high-temperature environment. The coating is kept wet when being output from the box body, and then the coating is not heated under the action of a cold source and the coating, so that the coating is thoroughly dried under the action of cold air; and wrinkles, dark marks and surface cracking of the coating in a high-temperature environment are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pole piece production, and particularly relates to a drying device for preventing the coating of a pole piece from cracking. Background Art

[0002] In the lithium battery manufacturing industry, in the coating process, positive and negative electrode slurries are coated on corresponding battery pole pieces and dried through an oven to remove solvents in the coated slurries to form a coating. However, defects such as wrinkles, dark marks, and surface cracks will occur when the coating is dried. For example, a patent document with a Chinese application number of 201620340849.8 and a publication date of September 21, 2016 discloses a capacitor pole piece coating drying oven, which includes a drying oven body. The drying oven body at least includes a rapid drying sub-oven body and a slow drying sub-oven body. At least one row of upper air nozzles and at least one row of lower air nozzles are arranged in both the rapid drying sub-oven body and the slow drying sub-oven body. A drying channel for a feed belt to pass through is left between the upper air nozzles and the lower air nozzles.

[0003] This drying oven uses multiple drying sub-oven bodies to dry the coating, so that the coating is completely dried at high temperature. However, defects such as wrinkles, dark marks, and surface cracks will still occur in the coating. At the same time, the coating is only arranged on one side surface of the battery pole piece. The upper air nozzles are used to heat the coating, and the lower air nozzles are used to heat the battery pole piece. Since the heat absorption and heat dissipation effects of the battery pole piece and the coating are different, when the same amount of heat is transferred to the battery pole piece and the coating, the time for the coating and the battery pole piece to expand due to heat and contract due to cooling is inconsistent. The battery pole piece and the coating do not expand and contract synchronously, so the coating is prone to cracking. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a drying device for preventing the coating of a pole piece from cracking. The coating is not completely dried in a high-temperature environment, and the coating remains moist when it exits the box body. Then, the coating is acted on by a cold source without heating the coating, so that the coating is completely dried under the action of cold air, and wrinkles, dark marks, and surface cracks of the coating in a high-temperature environment are avoided.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] A drying device for preventing the coating of a pole piece from cracking according to the utility model includes a box body and a second drying device. A first drying device and a conveying device are arranged in the box body. The first drying device is connected to a heat source, and the heat source is provided with an intake valve, and the intake valve controls the air output volume of the first drying device. The second drying device is connected to a cold source and is arranged near the output end of the conveying device. The conveying device is used for conveying a battery pole piece coated with a coating. The first drying device is used for incompletely drying the coating, and the second drying device is used for completely drying the coating.

[0007] Preferably, the first drying device includes more than one upper air nozzle and more than one lower air nozzle, the upper air nozzle and the lower air nozzle are arranged opposite to each other, and both the upper air nozzle and the lower air nozzle are connected to a heat source.

[0008] Preferably, the upper air nozzle and the lower air nozzle are alternately arranged along the length direction of the box body.

[0009] Preferably, an upper adjusting device and a lower adjusting device are arranged in the box body. The upper air nozzle is connected to the upper adjusting device, and the lower air nozzle is connected to the lower adjusting device. The upper adjusting device is used to adjust the distance between the upper air nozzle and the coating, and the lower adjusting device is used to adjust the distance between the lower air nozzle and the battery electrode plate. The distance between the lower air nozzle and the battery electrode plate is greater than the distance between the upper air nozzle and the coating.

[0010] Preferably, the heat source includes an air box and a heat exchanger. The output end of the air box is connected to the input end of the heat exchanger, and the upper air nozzle and the lower air nozzle are connected to the output end of the heat exchanger. The intake valve is arranged at the input end of the air box.

[0011] Preferably, the second drying device includes a frame. An air knife is arranged on the frame, and a roller is arranged below the air knife. The air knife includes an air chamber, and the air chamber is connected to a cold source. An air outlet is arranged on one side of the air chamber.

[0012] Preferably, the air knife further includes an adjusting bracket and an adjusting screw. The air chamber is fixedly connected to the adjusting bracket. A waist-shaped hole is arranged on the adjusting bracket, and the waist-shaped hole is arranged along the height direction of the air chamber. The adjusting screw passes through the waist-shaped hole and is threadedly connected to the threaded hole on the frame.

[0013] The beneficial effects of the gearbox of the present invention compared with the prior art are mainly reflected in:

[0014] The intake valve is provided to reduce the air output of the first drying device, so that the coating is not completely dried in a high-temperature environment. Then, the coating can still remain moist after exiting the box body, and then the second drying device continues to dry the coating. By the action of the cold source on the coating without heating the coating, the coating is dried under the action of cold air. In this way, it can not only avoid wrinkles, dark marks, and surface cracks of the coating in a high-temperature environment, but also make the coating completely dry.

[0015] By arranging the upper air nozzle and the lower air nozzle to act on the coating simultaneously and drying the coating in different directions, the heating is uniform. At the same time, the upper air nozzle and the lower air nozzle are alternately arranged to avoid the interference between the air output of the upper air nozzle and the lower air nozzle.

[0016] The upper adjusting device is set to drive the upper air nozzle to move, and the lower adjusting device is set to drive the lower air nozzle to move, so as to adjust the distance between the upper air nozzle and the coating and the distance between the lower air nozzle and the battery electrode. In this way, the positions of the upper air nozzle and the lower air nozzle can be adjusted according to the thickness of the battery electrode and the thickness of the coating. At the same time, due to the different heat absorption and heat dissipation effects of the battery electrode and the coating, increasing the distance between the lower air nozzle and the battery electrode makes the heat transferred to the battery electrode less than the heat transferred to the coating, so that the coating and the battery electrode can remain synchronized during thermal expansion and cooling contraction, further reducing the risk of coating cracking.

[0017] In the second drying device, the height of the adjustment bracket is changed by the cooperation of the adjustment screw and the adjustment bracket, so as to change the distance between the air knife and the roller; the position of the air knife can be adjusted according to the thickness of the battery electrode and the thickness of the coating, which is convenient for use.

[0018] In the present utility model, the coating is not completely dried in a high-temperature environment, and the coating remains moist to avoid cracking. Then, the coating is acted on by a cold source without heating the coating, so that the coating is completely dried under the action of cold air; in this way, not only can the coating avoid wrinkles, dark marks and surface cracking in a high-temperature environment, but also the coating can be completely dried. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present utility model will become clearer through the preferred embodiments of the present utility model shown in the drawings. The same reference numerals in all the drawings indicate the same parts, and the drawings are not deliberately drawn to scale in actual size, and the focus is on showing the gist of the present utility model.

[0020] Figure 1 It is a schematic diagram of the present utility model.

[0021] Figure 2 It is a schematic diagram of the positions of the upper air nozzle and the lower air nozzle in the present utility model.

[0022] Figure 3 It is a schematic diagram of the air knife in the present utility model.

[0023] BRIEF DESCRIPTION OF THE DRAWINGS: Box body 1, second drying device 2, battery electrode 3, coating 4, first drying device 10, conveying device 11, upper adjusting device 12, lower adjusting device 13, upper air nozzle 14, lower air nozzle 15, frame 21, air knife 22, roller 23, upper adjusting bracket 121, upper adjusting part 122, lower adjusting bracket 131, lower adjusting part 132, air chamber 221, adjusting bracket 222, air outlet 223, waist hole 224, threaded hole 211. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solution of the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it. However, the embodiments given are not intended to limit the present utility model. In this embodiment, it should be understood that the orientation or positional relationships indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model.

[0025] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated therewith, or there may be an intermediate element present at the same time. The terms "installation", "one end", "the other end" and similar expressions used in the present utility model are only for the purpose of illustration.

[0026] This embodiment provides a drying device for preventing the coating of the electrode sheet from cracking, as Figures 1-3 shown, which includes a box body 1 and a second drying device 2. A first drying device 10 and a conveying device 11 are provided in the box body 1. The first drying device 10 is connected to a heat source, and the heat source is provided with an air inlet valve (not shown in the figure). The air inlet valve controls the air output volume of the first drying device 10. The second drying device 2 is connected to a cold source and is arranged near the output end of the conveying device 11. The conveying device 11 is used to convey the battery electrode sheet coated with a coating. The first drying device 10 is used to incompletely dry the coating, and the second drying device 2 is used to completely dry the coating.

[0027] The heat source outputs hot air; the cold source outputs cold air. The air inlet valve is set to reduce the air output volume of the first drying device 10, so that the coating is incompletely dried in a high-temperature environment. Then, the coating can still remain moist after being output from the box body 1, and then the second drying device 2 continues to dry the coating. By the action of the cold source on the coating, the coating is not heated, and the coating is dried under the action of cold air; in this way, it can not only avoid the coating from having wrinkles, dark marks, and surface cracking in a high-temperature environment, but also make the coating completely dry.

[0028] The first drying device 10 includes an upper adjusting device 12, a lower adjusting device 13, more than one upper air nozzle 14 and more than one lower air nozzle 15. More than one upper air nozzle 14 is connected to the upper adjusting device 12, and more than one lower air nozzle 15 is connected to the lower adjusting device 13. The upper air nozzle 14 and the lower air nozzle 15 are arranged opposite to each other, and both the upper air nozzle 14 and the lower air nozzle 15 are connected to the heat source. By setting the upper air nozzle 14 and the lower air nozzle 15 to act on the coating at the same time and drying the coating in different directions, the heating is uniform.

[0029] The upper adjusting device 12 is used to adjust the distance between the upper air nozzle 14 and the coating 4, and the lower adjusting device 13 is used to adjust the distance between the lower air nozzle 15 and the battery electrode plate 3; the distance L2 between the lower air nozzle 15 and the battery electrode plate 3 is greater than the distance L1 between the upper air nozzle 14 and the coating 4. The upper adjusting device 12 is provided to drive the upper air nozzle 14 to move, and the lower adjusting device 13 is provided to drive the lower air nozzle 15 to move, so as to adjust the distance between the upper air nozzle 14 and the coating and the distance between the lower air nozzle 15 and the battery electrode plate. In this way, the positions of the upper air nozzle 14 and the lower air nozzle 15 can be adjusted according to the thickness of the battery electrode plate and the thickness of the coating. Since the heat absorption and heat dissipation effects of the battery electrode plate and the coating are different, increasing the distance between the lower air nozzle 15 and the battery electrode plate, the heat transferred to the battery electrode plate is less than the heat transferred to the coating, so that the coating and the battery electrode plate can be synchronized during thermal expansion and cooling contraction, further reducing the risk of coating cracking.

[0030] The upper adjusting device 12 includes an upper adjusting bracket 121 and an upper adjusting member 122. The upper air nozzle 14 is arranged at the bottom of the upper adjusting bracket 121, and the upper adjusting member 122 is connected to the upper adjusting bracket 121 for adjusting the height of the upper adjusting bracket 121; the lower adjusting device 13 includes a lower adjusting bracket 131 and a lower adjusting member 132. The lower air nozzle 15 is arranged at the top of the lower adjusting bracket 131, and the lower adjusting member 132 is connected to the lower adjusting bracket 131 for adjusting the height of the lower adjusting bracket 131. The upper adjusting member 122 and the lower adjusting member 132 are both screw jacks.

[0031] In a preferred embodiment, the upper adjusting member 122 and the lower adjusting member 132 are cylinders; the lifting is driven by the cylinders, and the structure is simple.

[0032] In a preferred embodiment, the upper air nozzle 14 and the lower air nozzle 15 are alternately arranged along the length direction of the box body 1. At the same time, the upper air nozzle 14 and the lower air nozzle 15 are alternately arranged to avoid the interference between the air output of the upper air nozzle 14 and the air output of the lower air nozzle 15.

[0033] The heat source includes an air box (not shown in the figure) and a heat exchanger (not shown in the figure). The output end of the air box is connected to the input end of the heat exchanger, and both the upper air nozzle 14 and the lower air nozzle 15 are connected to the output end of the heat exchanger; the intake valve is arranged at the input end of the air box. The conveying device 11 is a roller conveyor, and the roller conveyor is prior art and will not be described in detail here.

[0034] The second drying device 2 includes a frame 21, on which there is an air knife 22. More than one air knife 22 is provided. In this embodiment, two air knives 22 are provided. Below the air knife 22, there is a roller 23; the air knife 22 includes an air chamber 221, an adjustment bracket 222 and an adjustment screw (not shown in the figure); the air chamber 221 is connected to a cold source, and an air outlet 223 is provided on one side of the air chamber 221; the air chamber 221 is fixedly connected to the adjustment bracket 222, and a waist-shaped hole 224 is provided on the adjustment bracket 222. The waist-shaped hole 224 is arranged along the height direction of the air chamber 221; the adjustment screw passes through the waist-shaped hole 224 and is threadedly connected to the threaded hole 211 on the frame 21. The battery electrode plate is continuously conveyed through the roller 23, driving the battery electrode plate to move and act with the air knife 22. By cooperating the adjustment screw with the adjustment bracket 222, the height of the adjustment bracket 222 is changed, so as to change the distance between the air knife 22 and the roller 23; the position of the air knife 22 can be adjusted according to the thickness of the battery electrode plate and the thickness of the coating, which is convenient for use.

[0035] The working principle of this utility model: reduce the opening degree of the intake valve, reduce the air intake volume of the air box, so as to reduce the hot air output volume of the first drying device 10, make the coating not completely dried in the high-temperature environment of the box body 1, and the coating on the surface of the battery electrode plate output from the box body 1 still remains moist, and then the second drying device 2 is used to thoroughly dry the coating with cold air.

[0036] In this specification, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] In the description of this specification, the description with reference to terms such as "preferred embodiment", "another embodiment", "other embodiments" or "specific examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0038] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A drying device for preventing cracking of a pole piece coating, characterized in that: It comprises a box body and a second drying device, wherein a first drying device and a conveying device are arranged in the box body, the first drying device is connected to a heat source, the heat source is provided with an air intake valve, the air intake valve controls the air output of the first drying device, the second drying device is connected to a cold source and is arranged close to the output end of the conveying device, the conveying device is used to convey the battery pole piece coated with the coating, the first drying device is used to incompletely dry the coating, and the second drying device is used to thoroughly dry the coating.

2. The drying device for preventing cracking of the electrode coating according to claim 1 is characterized in that: The first drying device comprises more than one upper air nozzle and more than one lower air nozzle, the upper air nozzle and the lower air nozzle are arranged opposite to each other, and both the upper air nozzle and the lower air nozzle are connected to a heat source.

3. The drying device for preventing cracking of the electrode coating according to claim 2 is characterized in that: The upper air nozzles and the lower air nozzles are alternately arranged along the length direction of the box body.

4. The drying device for preventing cracking of the electrode coating according to claim 2 is characterized in that: An upper adjusting device and a lower adjusting device are provided in the box body, the upper air nozzle is connected to the upper adjusting device, and the lower air nozzle is connected to the lower adjusting device; the upper adjusting device is used to adjust the distance between the upper air nozzle and the coating, and the lower adjusting device is used to adjust the distance between the lower air nozzle and the battery electrode; the distance between the lower air nozzle and the battery electrode is greater than the distance between the upper air nozzle and the coating.

5. The drying device for preventing cracking of the electrode coating according to claim 1 is characterized in that: The heat source comprises a bellows and a heat exchanger, the output end of the bellows is connected to the input end of the heat exchanger, the upper air nozzle and the lower air nozzle are connected to the output end of the heat exchanger; and the air inlet valve is arranged at the input end of the bellows.

6. The drying device for preventing cracking of the electrode coating according to claim 1 is characterized in that: The second drying device comprises a frame, a wind knife is arranged on the frame, and a roller is arranged below the wind knife; the wind knife comprises a wind chamber, the wind chamber is connected to a cold source, and an air outlet is arranged on one side of the wind chamber.

7. The drying device for preventing cracking of the electrode coating according to claim 6 is characterized in that: The wind knife also includes an adjustment bracket and an adjustment screw. The wind chamber is fixedly connected to the adjustment bracket. A waist hole is provided on the adjustment bracket. The waist hole is arranged along the height direction of the wind chamber. The adjustment screw passes through the waist hole and is threadedly connected to the threaded hole on the frame.

Images