Drying device and coating equipment

Abstract

The utility model relates to the field of pole piece processing, and provides a drying device and coating equipment. The drying device comprises a heating assembly arranged on a running path of the pole piece and used for heating and drying the pole piece; the flattening assemblies are arranged on the two sides of the running path, each flattening assembly comprises a carrier roller, a pressing roller and a driving device, the carrier rollers and the pressing rollers can rotate and are parallel, the driving devices are used for driving the carrier rollers and the pressing rollers to rotate in the opposite directions, and the pressing rollers and the carrier rollers are arranged on the upper side and the lower side of the edge of the pole piece in a clamped mode respectively; and the rotating axis of the compression roller intersects with the running direction of the pole piece. An acute angle is formed between the friction force provided by the compression roller for the pole piece and the running direction of the pole piece, so that the friction force can be decomposed into an acting force along the running direction and an acting force vertical to the running direction, and the acting force along the running direction can reduce the resistance of the compression roller, so that the pole piece acts more smoothly and is vertical to the running direction; and the effect of transversely tensioning the pole piece can be achieved, so that the pole piece is flattened.

Description

Technical Field

[0001] The utility model relates to the technical field of pole piece processing, in particular to a drying device and a coating device. Background Art

[0002] Coating is an indispensable and important step in the production process of lithium batteries. Coating is a process in which the active material, binder and other slurries are first coated on the surface of the current collector through a coating head, and then dried by a drying device to obtain the electrode.

[0003] In the coating process of the prior art, the slurry is usually first coated on one side of the current collector and dried, and then the slurry is coated on the other side of the current collector and dried.

[0004] The inventors have found in practice that when single-sided coating and drying is used, the side of the current collector with the slurry shrinks due to drying, which can cause the foil to wrinkle and curl at the edges during the drying process, which can easily cause tensile force concentration and increase the probability of the current collector breaking. Utility Model Content

[0005] The utility model provides a drying device and a coating device, which are used to solve or improve the defects of the prior art that the foil material is prone to wrinkles or edge warping during the drying process.

[0006] On the one hand, the utility model provides a drying device for drying a pole piece, comprising:

[0007] A heating component is arranged on the running path of the pole piece and is used to heat and dry the pole piece;

[0008] A flattening assembly is provided on both sides of the running path, and the flattening assembly includes a supporting roller, a pressure roller and a driving device. The supporting roller and the pressure roller are both rotatable and their rotation axes are parallel. The driving device is used to drive the supporting roller and the pressure roller to rotate in opposite directions. The pressure roller and the supporting roller are respectively clamped on the upper and lower sides of the edge of the pole piece, the rotation axis of the pressure roller intersects with the running direction of the pole piece, and the end of the pressure roller close to the center of the pole piece is inclined toward the running direction of the pole piece relative to the other end of the pressure roller.

[0009] According to a drying device provided by the utility model, the support roller, the pressure roller and the driving device are all arranged on the heating component.

[0010] According to a drying device provided by the utility model, the flattening assembly also includes a support, the support roller and the pressure roller are both rotatably connected to the support, the driving device is installed on the support, and the support is installed on the heating assembly.

[0011] According to a drying device provided by the utility model, the support is arranged on the support in an adjustable angle around a preset axis, and the preset axis is perpendicular to the rotation axis of the pressure roller and the running path.

[0012] According to a drying device provided by the utility model, the flattening component also includes a locking screw, an arc groove is provided on the support, the center of the arc groove coincides with the preset axis, and the locking screw passes through the arc groove and is connected to the heating component.

[0013] According to a drying device provided by the utility model, the heating component includes an air supply duct and an air outlet structure, the air supply duct is used to transport hot air, the air supply duct is arranged opposite to the pole piece, the air outlet structure is installed on the air supply duct and connected with the air supply duct, the air outlet structure faces the pole piece and is used to supply air to the pole piece, and the support roller, the pressure roller and the driving device are all arranged on the air supply duct.

[0014] According to a drying device provided by the utility model, the air supply duct is provided with a plurality of the air outlet structures distributed along the running path, and the flattening component is arranged between two adjacent air outlet structures.

[0015] According to a drying device provided by the utility model, the driving device includes a rotating driving component, a first gear and a second gear, the first gear is coaxially connected to the supporting roller, the second gear is coaxially connected to the pressure roller, the first gear and the second gear are meshed, and the output shaft of the rotating driving component is transmission-connected to the supporting roller or the pressure roller.

[0016] According to a drying device provided by the utility model, a friction layer is provided on the surface of at least one of the support roller and the pressure roller.

[0017] On the other hand, the utility model also provides a coating device, including a coating head and the drying device as described above.

[0018] The drying device provided by the utility model can heat and dry the pole piece through the heating component. By setting the flattening component, the supporting roller and the pressure roller of the flattening component can be rotatably set and the rotation axes of the two are parallel, and the supporting roller and the pressure roller are clamped on the upper and lower sides of the edge of the pole piece, the rotation axis of the pressure roller intersects with the running direction of the pole piece, and the end of the pressure roller close to the center of the pole piece is inclined to the running direction of the pole piece relative to the other end of the pressure roller, and the supporting roller is parallel to the pressure roller, so the inclination posture of the supporting roller is the same as that of the pressure roller. The driving device drives the supporting roller and the pressure roller to rotate in opposite directions.

[0019] During use, the driving device drives the pressure roller and the supporting roller to rotate in opposite directions. By setting the driving direction of the driving device, the linear velocity of the part of the pressure roller that contacts the pole piece forms an acute angle with the running direction of the pole piece, that is, the friction force provided by the pressure roller to the pole piece forms an acute angle with the running direction of the pole piece. Therefore, the friction force can be decomposed into a force along the running direction and a force perpendicular to the running direction. The force along the running direction can reduce the resistance of the pressure roller, making the pole piece move more smoothly. The force perpendicular to the running direction can play the role of horizontally tensioning the pole piece, so that the pole piece is flattened, thereby reducing the wrinkles and warping problems of the pole piece. The principle of the supporting roller is actually the same as that of the pressure roller, which will not be repeated here.

[0020] The coating arrangement provided by the utility model includes the drying device provided by the utility model, and thus includes all the above advantages of the drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural schematic diagram of a flattening assembly provided in an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 Schematic diagrams of other angles of the view shown;

[0024] Figure 3 It is a structural schematic diagram of a drying device provided in an embodiment of the utility model;

[0025] Figure 4 yes Figure 3 Axonometric drawing of the view shown;

[0026] Figure 5 yes Figure 4 A partial enlarged view of position I in the view shown;

[0027] Figure 6 It is a schematic diagram of the posture of the flattening component provided in an embodiment of the utility model relative to the pole piece.

[0028] Reference numerals:

[0029] 1. Heating assembly; 101. Air supply duct; 102. Air outlet structure; 2. Flattening assembly; 201. Support roller; 202. Pressing roller; 203. Support; 204. Rotating drive assembly; 205. First gear; 206. Second gear; 3. Pole piece. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Combine the following Figure 1-Figure 6 The drying device provided in the embodiment of the utility model is described.

[0032] Specifically, the drying device is used to dry the electrode piece 3. Specifically, the electrode piece 3 runs between the unwinding roller and the winding roller, and the drying device is arranged between the unwinding roller and the winding roller to dry the electrode piece 3. The drying device includes a heating component 1 and a flattening component 2.

[0033] The heating component 1 is arranged on the running path of the pole piece 3 and is used to heat and dry the pole piece 3. For example, the heating component 1 can be a hot air heating device or an infrared heating device.

[0034] Flattening components 2 are provided on both sides of the running path of the pole piece 3. The flattening component 2 includes a support roller 201, a pressure roller 202 and a driving device. Both the support roller 201 and the pressure roller 202 can be rotatably arranged, and the rotation axis of the support roller 201 is parallel to the rotation axis of the pressure roller 202. The driving device is used to drive the support roller 201 and the pressure roller 202 to rotate in opposite directions. The pressure roller 202 and the support roller 201 are respectively clamped on the upper and lower sides of the edge of the pole piece 3, that is, the pressure roller 202 is arranged above the edge of the pole piece 3, and the support roller 201 is arranged below the edge of the pole piece 3. Reference Figure 6 As shown, the rotation axis of the pressure roller 202 intersects with the running direction of the pole piece 3, and one end of the pressure roller 202 close to the center of the pole piece 3 is inclined toward the running direction of the pole piece 3 relative to the other end of the pressure roller 202, for example, Figure 6 For example, the running direction of the pole piece 3 is toward the upper part in the figure, so the end of the pressure roller 202 close to the center of the pole piece 3 is inclined toward the upper part in the figure relative to the other end of the pressure roller 202. The support roller 201 is parallel to the pressure roller 202 and the two are arranged opposite to each other, so the support roller 201 and the pressure roller 202 have the same inclination direction, so it will not be repeated.

[0035] In this embodiment, during use, the driving device drives the pressure roller 202 and the support roller 201 to rotate in opposite directions. By setting the driving direction of the driving device, the linear velocity of the portion of the pressure roller 202 contacting the pole piece 3 forms an acute angle with the running direction of the pole piece 3, for example Figure 6 As shown, the direction of the linear velocity of the portion of the pressure roller 202 contacting the pole piece 3 is the same as the direction of the friction force f in the figure, so that the friction force f provided by the pressure roller 202 to the pole piece 3 is at an acute angle to the running direction V of the pole piece 3, so the friction force can be decomposed into a force along the running direction and a force perpendicular to the running direction, wherein the force along the running direction can reduce the resistance of the pressure roller 202, making the pole piece 3 move more smoothly, and the force perpendicular to the running direction can play the effect of lateral tensioning the pole piece 3, making the pole piece 3 flat, thereby reducing the wrinkles and warping problems of the pole piece 3. The principle of the roller 201 is actually the same as that of the pressure roller 202, and will not be repeated here.

[0036] In addition, refer to Figure 6 As shown, the grid lines in the figure are areas that need to be coated with slurry, while the edges on both sides of the pole piece 3 are areas that do not need to be coated with slurry. The pressure roller 202 contacts the area that is not coated with slurry and will not affect the coated slurry.

[0037] In this embodiment, optionally, the flattening components 2 on both sides of the running path of the pole piece 3 are symmetrically arranged, so that the lateral tension forces received on both sides of the pole piece 3 offset each other, avoiding the problem of the pole piece 3 being pulled off. Further, multiple flattening components 2 are arranged on both sides of the pole piece 3, and the multiple flattening components 2 are distributed along the running path of the pole piece 3. Such an arrangement can make the pole piece 3 in the range where the multiple flattening components 2 are located in a flattened state, ensuring the flattening effect of the pole piece 3 during the drying process.

[0038] In this embodiment, optionally, the linear velocity of the portion of the pressure roller 202 contacting the pole piece 3 along the running direction is equal to the running speed of the pole piece 3. This arrangement can further reduce the resistance of the pressure roller 202 to the pole piece 3. The same is true for the roller 201, which will not be described in detail.

[0039] In some embodiments provided by the present invention, the roller 201, the pressure roller 202 and the driving device are all arranged on the heating component 1. In this embodiment, by arranging the roller 201, the pressure roller 202 and the driving device on the heating component 1, the installation space on the heating component 1 can be fully utilized, thereby improving the space utilization rate of the drying device.

[0040] Of course, the supporting roller 201, the pressure roller 202 and the driving device are not limited to being arranged on the heating component 1. For example, in other embodiments provided by the present utility model, the heating component 1, the supporting roller 201, the pressure roller 202 and the driving device are all arranged on the frame.

[0041] In some embodiments provided by the utility model, the flattening assembly 2 further includes a support 203, the roller 201 and the pressure roller 202 are both rotatably connected to the support 203, the driving device is mounted on the support 203, and the support 203 is mounted on the heating assembly 1. In this embodiment, by mounting the roller 201, the pressure roller 202 and the driving device on the support 203, the flattening assembly 2 can be assembled and then mounted on the heating assembly 1, thereby facilitating the assembly and debugging of the flattening assembly 2, and reducing the difficulty of mounting and debugging of each component directly on the heating assembly 1.

[0042] In some embodiments provided by the utility model, the support 203 is arranged on the support 203 with an adjustable angle around a preset axis, and the preset axis is perpendicular to the rotation axis of the pressure roller 202 and the running path. That is, the running path of the pole piece 3 and the rotation axis of the pressure roller 202 are both perpendicular to the preset axis. In this embodiment, by adjusting the angle of the support 203 on the support 203, the angle between the rotation axis of the pressure roller 202 and the running path can be changed by adjusting the angle of the support 203, so that the rotation axis of the pressure roller 202 and the running path have a suitable angle, ensuring the flattening effect on the pole piece 3. In addition, when the number of flattening components 2 is multiple, it is convenient to make the flattening component 2 at each position have a suitable angle with the pole piece 3.

[0043] In some embodiments provided by the utility model, the flattening assembly 2 further includes a locking screw. An arc groove is provided on the support 203, the center of the arc groove coincides with the preset axis, and the locking screw passes through the arc groove and is connected to the heating assembly 1. In this embodiment, when the angle of the flattening assembly 2 needs to be adjusted, the locking screw is first loosened, and then the support 203 is rotated. After the adjustment is completed, the locking screw is tightened. In this arrangement, the connection structure between the support 203 and the heating assembly 1 is simple and convenient to process.

[0044] In this embodiment, optionally, the number of arc grooves is set to at least two, and each arc groove is provided with a corresponding locking screw. Such a setting can improve the connection strength between the support 203 and the heating component 1 and avoid the problem of loosening of the support 203.

[0045] In this embodiment, optionally, the locking screw passes through the arc groove and is threadedly connected to the heating component 1, or the locking screw passes through the arc groove and is connected to the heating component 1 through a nut.

[0046] In this embodiment, optionally, scale lines distributed circumferentially along a preset axis are provided on the support 203 , and the accuracy of adjusting the angle of the flattening component 2 can be improved through the scale lines.

[0047] Of course, the support 203 is not limited to adjusting the angle by means of the arc groove. For example, in other embodiments provided by the present invention, the support 203 can be rotatably connected to the heating component 1 through a rotating shaft, and the rotating shaft of the support 203 can be locked by a nut after passing through the heating component 1. Alternatively, the rotating shaft of the support 203 is driven by a motor, and the motor drives the rotating shaft to rotate, thereby adjusting the angle of the support 203.

[0048] In some embodiments provided by the present invention, the heating assembly 1 includes an air supply duct 101 and an air outlet structure 102 .

[0049] The air supply duct 101 is used to transport hot air. The air supply duct 101 is arranged opposite to the pole piece 3, for example, the air supply duct 101 is arranged above or below the pole piece 3. The air outlet structure 102 is installed on the air supply duct 101 and communicates with the air supply duct 101. The air outlet structure 102 faces the pole piece 3 and is used to supply air to the pole piece 3. The roller 201, the pressure roller 202 and the driving device are all arranged on the air supply duct 101. For example, as described above, the roller 201, the pressure roller 202 and the driving device are all installed on the air supply duct 101 through the support 203.

[0050] In this embodiment, the circulation of hot air can quickly evaporate the moisture and solvent in the pole piece 3, thereby shortening the drying time. By arranging the roller 201, the pressure roller 202 and the driving device on the air supply duct 101, the installation space on the air supply duct 101 can be fully utilized to improve the space utilization rate of the drying device. In addition, since the roller 201 and the pressure roller 202 of the flattening assembly 2 can stretch the pole piece 3, the problem of the pole piece 3 shaking under the action of wind can be reduced.

[0051] refer to Figure 3 and Figure 4 As shown, in some embodiments provided by the present invention, the air supply duct 101 is provided with a plurality of air outlet structures 102 distributed along the running path, and the flattening component 2 is arranged between two adjacent air outlet structures 102. In this embodiment, by arranging the flattening component 2 between two adjacent air outlet structures 102, the space between the air outlet structures 102 can be fully utilized.

[0052] refer to Figure 3 and Figure 4 As shown, in some embodiments provided by the present invention, air supply ducts 101 are provided on both upper and lower sides of the running path of the pole piece 3, and each air supply duct 101 is provided with an air outlet structure 102 on one side close to the pole piece 3. In this way, the pole piece 3 can be dried at the same time through the air supply ducts 101 provided on the upper and lower sides, which can improve the drying efficiency of the pole piece 3.

[0053] In some embodiments provided by the present utility model, the air outlet structure 102 includes a shell, the shell is connected to the air supply duct 101, and a plurality of air outlet holes are provided on the surface of the shell, and the air outlet holes are all facing the pole piece 3. In this embodiment, by providing a plurality of air outlet holes on the shell, the air outlet of the air outlet structure 102 is uniform, which can improve the drying effect and drying efficiency of the drying device on the pole piece 3.

[0054] In some embodiments provided by the present invention, the driving device includes a rotation driving assembly 204 , a first gear 205 and a second gear 206 .

[0055] Among them, the first gear 205 is coaxially connected to the roller 201, the second gear 206 is coaxially connected to the pressure roller 202, the first gear 205 and the second gear 206 are meshed, and the output shaft of the rotation drive component 204 is transmission-connected to the roller 201 or the pressure roller 202. In this embodiment, the rotation drive component 204 drives the roller 201 and the pressure roller 202 to rotate, and at the same time, the first gear 205 and the second gear 206 are meshed and transmitted, so that the pressure roller 202 and the roller 201 rotate synchronously in the opposite direction. With such an arrangement, the structure of the driving device is simple and the cost is low.

[0056] Optionally, the first gear 205 and the second gear 206 have the same number of teeth, and the diameters of the roller 201 and the pressure roller 202 are the same. This arrangement can reduce the design cost and processing cost of the drive device, the roller 201 and the pressure roller 202.

[0057] Optionally, the rotation driving assembly 204 can be configured as a motor, and the output shaft of the motor is transmission-connected to the support roller 201 or the pressure roller 202 via a coupling.

[0058] Of course, the driving device is not limited to the above-mentioned manner. For example, in other embodiments, the driving device includes two motors, and the two motors are respectively connected to the supporting roller 201 and the pressure roller 202 through transmission.

[0059] In some embodiments provided by the present invention, a friction layer is provided on the surface of at least one of the roller 201 and the pressure roller 202. In this embodiment, by providing a friction layer on the surface of the roller 201 or the pressure roller 202, the friction force between the roller 201 or the pressure roller 202 and the pole piece 3 can be increased, thereby improving the flattening effect on the pole piece 3.

[0060] Optionally, the friction layer is configured to be a high temperature resistant plastic material, such as but not limited to polytetrafluoroethylene, polyetheretherketone and polyimide.

[0061] A coating device is also provided in an embodiment of the utility model.

[0062] Specifically, the coating device includes a coating head and a drying device as described above.

[0063] The coating equipment includes a drying device, and also includes all the above advantages of the drying device.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model 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 of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A drying device, characterized in that: Used for drying the pole pieces, including: A heating component is arranged on the running path of the pole piece and is used to heat and dry the pole piece; A flattening assembly is provided on both sides of the running path, and the flattening assembly includes a supporting roller, a pressure roller and a driving device. The supporting roller and the pressure roller are both rotatable and their rotation axes are parallel. The driving device is used to drive the supporting roller and the pressure roller to rotate in opposite directions. The pressure roller and the supporting roller are respectively clamped on the upper and lower sides of the edge of the pole piece, the rotation axis of the pressure roller intersects with the running direction of the pole piece, and the end of the pressure roller close to the center of the pole piece is inclined toward the running direction of the pole piece relative to the other end of the pressure roller.

2. The drying device according to claim 1, characterized in that: The support roller, the pressure roller and the driving device are all arranged on the heating component.

3. The drying device according to claim 2, characterized in that: The flattening assembly also includes a support, the support roller and the pressure roller are both rotatably connected to the support, the driving device is installed on the support, and the support is installed on the heating assembly.

4. The drying device according to claim 3, characterized in that: The support is arranged on the support in an adjustable manner around a preset axis, and the preset axis is perpendicular to the rotation axis of the pressure roller and the running path.

5. The drying device according to claim 4, characterized in that: The flattening assembly also includes a locking screw. The support is provided with an arc groove, the center of the arc groove coincides with the preset axis, and the locking screw passes through the arc groove and is connected to the heating assembly.

6. The drying device according to claim 2, characterized in that: The heating assembly includes an air supply duct and an air outlet structure, the air supply duct is used to transport hot air, the air supply duct is arranged opposite to the pole piece, the air outlet structure is installed on the air supply duct and connected with the air supply duct, the air outlet structure faces the pole piece and is used to supply air to the pole piece, and the roller, the pressure roller and the driving device are all arranged on the air supply duct.

7. The drying device according to claim 6, characterized in that: The air supply duct is provided with a plurality of the air outlet structures distributed along the running path, and the flattening component is arranged between two adjacent air outlet structures.

8. The drying device according to any one of claims 1 to 7, characterized in that: The driving device includes a rotating driving component, a first gear and a second gear, the first gear is coaxially connected to the supporting roller, the second gear is coaxially connected to the pressure roller, the first gear and the second gear are meshed, and the output shaft of the rotating driving component is transmission-connected to the supporting roller or the pressure roller.

9. The drying device according to any one of claims 1 to 7, characterized in that: A friction layer is provided on the surface of at least one of the support roller and the pressure roller.

10. A coating device, characterized in that: The invention comprises a coating head and a drying device as claimed in any one of claims 1 to 9.

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