Coating device and coating machine
By using a second coating die head to abut downwards and form an acute angle with the electrode in the electrode coating equipment, combined with a support structure and tension roller, the problem of uneven coating caused by electrode vibration is solved, thereby improving production efficiency and coating quality.
Patent Information
- Application Number
- CN202422410280.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In the existing technology, after the electrode sheet is coated on the front side, the electrode sheet shakes, resulting in uneven coating on the back side and the slurry cannot be coated stably, which affects production efficiency and cost.
The second coating die head is used to press downward against the second surface of the electrode, and the discharge direction forms an acute angle with the extension direction of the electrode. Combined with the support structure and tension roller, it provides stability and uniformity, and reduces vibration and slurry impact.
It improves the stability and uniformity of the electrode coating process, enhances the coating effect, and reduces slurry waste and production costs.
Smart Images
Figure CN223465013U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery preparation, in particular to a coating device and a coating machine. BACKGROUND
[0002] In the production process of the electrode sheet of the battery, the coating and drying device is usually used for single-sided coating of the electrode sheet, that is, after the single-sided coating is completed, drying is needed before the other side is coated, and finally drying is needed. This way not only increases the number of ovens, resulting in rising production costs, but also reduces production efficiency.
[0003] In the related art, to solve the above problems, a double-layer coating device can be used to coat both sides of the electrode sheet, and the electrode sheet coated on both sides is dried at the same time. However, the double-layer coating device has the following problems: in the double-layer coating device, after the front side of the electrode sheet is coated, the second die along the conveying direction of the electrode sheet usually uses an upward coating type die with a discharge slot facing upward to realize coating of the back side of the electrode sheet. However, because the wet material on the front side of the electrode sheet has not yet solidified, a roller cannot be arranged on the front side of the electrode sheet to stabilize the electrode sheet, which leads to the electrode sheet being easily shaken during coating of the back side. This shaking will cause the distance between the discharge position and the surface of the electrode sheet to fluctuate, and the slurry extruded from the upward coating type die cannot reach the upwardly offset electrode sheet under the action of gravity, resulting in coating failure. CONTENT OF THE UTILITY MODEL
[0004] To solve at least one of the above technical problems, the present application provides a coating device and a coating machine, which can reduce the shaking of the electrode sheet during coating and reduce the impact of the fluctuation of the second coating die on the electrode sheet, improve the stability of the electrode sheet, and the technical solutions adopted are as follows.
[0005] The coating device provided in the first aspect of the present application comprises a first coating assembly and a second coating assembly. The first coating assembly comprises a first coating die for coating slurry on the first side of the electrode sheet. The second coating assembly comprises a second coating die for abutting downwardly against the second surface of the electrode sheet. The discharge direction of the second coating die forms an acute angle with the extension direction of the electrode sheet. The second coating assembly is arranged upstream or downstream of the first coating assembly along the conveying direction of the electrode sheet.
[0006] As an optional implementation, in some embodiments of the first aspect of the present application, the second coating die is provided with a discharge port, and the orientation of the discharge port is the same as the moving direction of the electrode sheet, or the orientation of the discharge port is opposite to the moving direction of the electrode sheet.
[0007] As an optional implementation, in some embodiments of the first aspect of the present application, the discharge direction of the second coating die forms an acute angle with the gravity direction.
[0008] As an optional implementation, in some embodiments of the first aspect of the present application, the second coating die is arranged to have a discharge direction forming an angle θ with the extension direction of the pole piece, where 0 < θ ≤ 45°.
[0009] As an optional implementation, in some embodiments of the first aspect of the present application, the second coating die is arranged to have a discharge direction forming an angle θ with the extension direction of the pole piece, where 0 < θ ≤ 45°.
[0010] As an optional implementation, in some embodiments of the first aspect of the present application, the support structure comprises a support block, which is arranged to protrude from the discharge port and has an arc surface for contacting the pole piece.
[0011] As an optional implementation, in some embodiments of the first aspect of the present application, the first coating assembly is arranged upstream of the second coating assembly, and the first coating assembly further comprises a tension roller arranged to wrap around the pole piece and contact the second surface of the pole piece, so that the first surface of the pole piece faces away from the tension roller, and the first coating die is arranged outside the periphery of the tension roller.
[0012] As an optional implementation, in some embodiments of the first aspect of the present application, the first coating assembly further comprises a transfer roller, and the first coating die is arranged to coat the slurry onto the surface of the transfer roller, and the transfer roller is arranged to wrap around the pole piece and contact the first surface of the pole piece.
[0013] As an optional implementation, in some embodiments of the first aspect of the present application, the first coating assembly further comprises a surplus material scraper arranged upstream of the first coating die along the feeding direction of the transfer roller, and the surplus material scraper is arranged to contact the surface of the transfer roller.
[0014] In a second aspect, the present application further provides a coating machine comprising the coating device provided in the first aspect.
[0015] The embodiments of the present application have at least the following beneficial effects: On the one hand, the present application adopts a method of abutting the electrode with the second coating die head, which can enable the second coating die head to provide a certain tensioning force and stabilizing effect on the electrode piece. The electrode piece can be tightened under the abutting force of the second coating die head, thereby reducing the vibration of the electrode piece itself and reducing the fluctuation of the distance between the discharge port of the second coating die head and the surface of the electrode piece, thereby improving the stability of the electrode piece during the coating process, and improving the uniformity and coating effect of the slurry coating. On the other hand, the second coating die head is set downward, and the discharge direction of the second coating die head is set at an acute angle to the extension direction of the electrode piece. In this way, when the slurry leaves the second coating die head, the force of the slurry on the electrode piece can be decomposed into a component force perpendicular to the surface of the electrode piece and a component force parallel to the surface of the electrode piece, thereby reducing the impact of the slurry on the surface of the electrode piece, thereby improving the uniformity and coating density of the coating on the second surface of the electrode piece and improving the coating effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The aspects and advantages described and / or attached in the embodiments of the present application will become apparent and easily understood in conjunction with the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.
[0017] Figure 1 A schematic structural diagram of a first example of a coating device provided in an embodiment of the present application;
[0018] Figure 2 A schematic structural diagram of a second example of a coating device provided in an embodiment of the present application;
[0019] Figure 3 for Figure 1 A local enlarged view of point A;
[0020] Figure 4 A schematic structural diagram of a third example of a coating device provided in an embodiment of the present application;
[0021] Figure 5 A schematic structural diagram of a fourth example of a coating device provided in an embodiment of the present application;
[0022] Figure 6 This is a schematic structural diagram of the fifth example of the coating device provided in the embodiments of the present application.
[0023] Figure numerals: 100, coating device; 10, first coating component; 11, first coating die; 12, tensioning roller; 13, transfer roller; 14, residual material scraper; 20, second coating component; 21, second coating die; 22, discharge port; 23, discharge channel; 24, supporting structure; 200, pole piece; 201, first surface; 202, second surface; 30, auxiliary roller. DETAILED DESCRIPTION
[0024] The embodiments of the present application will be described below in Figures 1 to 6 The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the drawings are exemplary only, for the purpose of explanation only, and are not to be understood as limiting the present application.
[0025] In the description of the present application, it is to be understood that the orientation or positional relationship indicated by terms such as "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.
[0026] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0027] In the production process of battery electrode sheet, active material needs to be coated on the opposite two surfaces (first surface, second surface) of the electrode sheet. Generally, after the active material is coated on the surface of the electrode sheet in the form of slurry, it needs to be dried and solidified to be stably attached to the surface of the electrode sheet. In the process of preparing the electrode sheet, the electrode sheet is transported in the form of a continuous strip, and the tensioning and transportation of the electrode sheet are realized by using auxiliary rollers. The electrode sheet surface is usually coated with slurry by winding the electrode sheet around the tensioning roller, so that the first surface of the electrode sheet faces away from the tensioning roller (at the same time, the second surface of the electrode sheet is in contact with the tensioning roller), so that the electrode sheet can maintain a certain tension and the surface of the electrode sheet is flat, and the first surface of the electrode sheet is coated with slurry by using a coating die. After the coating of the first surface of the electrode sheet is completed, if the second surface is still coated in this way, it means that the electrode sheet needs to be tensioned by using the tensioning roller to expose the second surface, but since the slurry on the first surface has not been solidified at this time, if the first surface is in contact with the tensioning roller, the freshly coated slurry on the first surface will be smudged or scratched, resulting in coating failure. If the tensioning and stabilizing effect of the electrode sheet is not provided by using the tensioning roller, the slurry cannot be uniformly and stably coated due to shaking and other problems during the coating process, which will also result in coating failure.
[0028] Based on this, please refer to Figure 1The first aspect of the present application provides a coating device 100, comprising a first coating assembly 10 and a second coating assembly 20, the first coating assembly 10 comprising a first coating die 11 for coating the first surface of the pole piece 200 with slurry; the second coating assembly 20 comprising a second coating die 21, the second coating die 21 being used to abut against the second surface 202 of the pole piece 200 downward, and the discharge direction a of the second coating die 21 and the extension direction of the pole piece 200 form an acute angle; wherein the second coating assembly 20 is arranged upstream or downstream of the first coating assembly 10 along the transportation direction of the pole piece 200. On the one hand, the present application adopts the mode that the second coating die 21 abuts against the pole piece 200, so that the second coating die 21 can provide a certain tension and stable effect to the pole piece 200, and the pole piece 200 can be tightened under the abutting force of the second coating die 21, thereby reducing the shaking of the pole piece 200 itself and reducing the fluctuation of the distance between the discharge port 22 of the second coating die 21 and the surface of the pole piece 200, thereby improving the stability of the pole piece 200 in the coating process and improving the uniformity and coating effect of the slurry coating. On the other hand, the second coating die 21 is arranged downward, and the discharge direction a of the second coating die 21 and the extension direction of the pole piece 200 form an acute angle, so that when the slurry leaves the second coating die 21, the force of the slurry on the pole piece 200 can be decomposed into a component perpendicular to the surface of the pole piece 200 and a component parallel to the surface of the pole piece 200, thereby reducing the impact of the slurry on the surface of the pole piece 200. During the discharging process of the second coating die 21, due to the shaking of the self-feeding of the second coating die 21, the shaking of the discharging process and the gravity of the slurry itself, the output pressure of the second coating die 21 itself has a certain fluctuation, which will affect the uniformity of the coating. Therefore, by arranging an included angle between the discharge direction a of the slurry and the extension direction of the pole piece 200, the influence of the fluctuation of the discharging process of the second coating die 21 on the coating stability of the pole piece 200 can be reduced, thereby improving the uniformity, coating density and coating effect of the second surface 202 of the pole piece 200.
[0029] In some embodiments, referring to Figure 1 and Figure 2 , the second coating die 21 is provided with a discharge port 22, the orientation of the discharge port 22 is the same as the moving direction of the pole piece 200 (as shown in Figure 1 ), or the orientation of the discharge port 22 is opposite to the moving direction of the pole piece 200 (as shown in Figure 2The second coating die 21 is provided with a discharge channel 23, and the discharge channel 23 is communicated with the discharge port 22. The slurry can be discharged along the extension direction of the discharge channel 23. Therefore, the setting direction of the structure of the discharge channel 23 is the discharge direction a. The discharge channel 23 can be provided in a straight way. At this time, the extension direction of the structure of the discharge channel 23 is the discharge direction a. Of course, the discharge channel 23 can also be provided in a curved way. At this time, the tangent direction of the discharge channel 23 at the discharge port 22 is the discharge direction a.
[0030] In some embodiments, the moving direction of the pole piece 200 is the same as the orientation of the discharge port 22, and the included angle between the discharge direction a and the gravity direction is an acute angle. By setting the orientation of the discharge port 22 to be the same as the moving direction of the pole piece 200, the pole piece 200 can immediately leave the projection area of the second coating die 21 after being coated with the slurry, so as to avoid the surface of the pole piece 200 that has been coated from being scratched by the shell of the second coating die 21 due to the small included angle between the pole piece 200 and the second coating die 21. The included angle between the discharge direction a and the gravity direction is an acute angle, and the discharge direction a also needs to satisfy the acute angle with the pole piece 200. At this time, the pole piece 200 is substantially horizontally arranged, or even if the pole piece 200 is arranged to be inclined, the included angle between the pole piece 200 and the horizontal direction is small. Therefore, when the surface of the pole piece 200 is coated with the liquid slurry, the problem of the slurry flowing or falling off the surface of the pole piece 200 before solidification due to the gravity of the slurry can be avoided, and the stability and coating effect of the coating can be improved.
[0031] In some embodiments, the included angle θ between the discharge direction a of the second coating die 21 and the extension direction of the pole piece 200 satisfies 0<θ≤45°, for example, the included angle θ can be 5°, 10°, 20°, 30°, 45°, etc. By controlling the included angle between the discharge direction a of the second coating die 21 and the extension direction of the pole piece 200 within the above range, the impact force of the second coating die 21 on the pole piece 200 during discharging can be decomposed, so as to reduce the influence of the vibration of the second coating die 21 and the gravity of the slurry on the stability of the pole piece 200, and the problem of the surface of the pole piece 200 being scratched due to the small distance between the pole piece 200 and the second coating die 21 can also be avoided. It can be understood that the smaller the θ is, the more the impact force of the second coating die 21 on the pole piece 200 in the direction perpendicular to the pole piece 200 can be decomposed, so as to effectively reduce the shaking problem of the pole piece 200.
[0032] In some embodiments, referring to Figure 3 , the second coating die 21 is provided with a discharge port 22 and a support structure 24, the support structure 24 is located upstream of the discharge port 22 along the transportation direction of the pole piece 200, and the support structure 24 is used to abut against the second surface 202 of the pole piece 200. By providing the support structure 24 upstream of the discharge port 22, the support structure 24 can be used to contact the pole piece 200, thereby avoiding direct contact between the discharge port 22 and the pole piece 200. Under the premise of meeting the support and tensioning effect of the second coating die 21 on the pole piece 200, avoiding direct contact between the discharge port 22 and the pole piece 200 can avoid wear or blockage of the discharge port 22, and also avoid scratching of the pole piece 200 by the discharge port 22, thereby playing a protective role for the discharge port 22 and improving the service life and use reliability of the discharge port 22. It can be seen from Figure 3 that along the moving direction of the pole piece 200, the pole piece 200 first contacts the support structure 24 and is lifted up under the abutting action of the support structure 24, that is, the pole piece 200 can be tensioned, thereby maintaining the tension and flatness of the surface of the pole piece 200 and avoiding shaking of the pole piece 200 during coating. Then the pole piece 200 reaches the position of the discharge port 22, the slurry is extruded from the discharge port 22 to the second surface 202 of the pole piece 200 and the coating is completed. Using this arrangement helps to improve the stability of the pole piece 200 and the coating effect during coating.
[0033] In some embodiments, the support structure 24 includes a support block, the support block is provided protruding from the discharge port 22, and the surface of the support block for contacting the pole piece 200 is arc-shaped. By setting the contact surface of the support block as arc-shaped, the friction between the support block and the surface of the pole piece 200 can be reduced, so that the pole piece 200 can pass through the support block more smoothly, and scratching of the pole piece 200 by the sharp corners of the support block can be avoided. It can be understood that the support block structure is simple to arrange, and the support block can be integrally formed with the shell of the second coating die 21. Of course, in other examples, the support block can also be arranged separately from the shell of the second coating die 21.
[0034] As an alternative implementation, the support structure 24 can also be provided in the form of a support rod in addition to the support block, the support rod can be arranged parallel to the surface of the pole piece 200, and the axial direction of the support rod is perpendicular to the moving direction of the pole piece 200. The outer circumferential surface of the support rod abuts against the surface of the pole piece 200, and the pole piece 200 is tightened by the support rod before reaching the discharge port 22. The support rod can be provided as a round rod, which has an arc-shaped outer circumferential surface, which also helps to reduce the friction between the round rod and the pole piece 200 and improve the smoothness when they slide relative to each other.
[0035] In the case that the second coating assembly 20 adopts the above-mentioned embodiment, the first coating assembly 10 can adopt a different coating mode from the second coating assembly 20. For example, the first surface 201 of the pole piece 200 can be coated by direct coating or indirect coating. The following describes the arrangement of the first coating assembly 10.
[0036] In the first embodiment, please refer to Figure 1 and Figure 2 , the first surface 201 of the pole piece 200 is taut by the tensioning roller 12, and the first surface 201 is directly coated. Specifically, the first coating assembly 10 is arranged upstream of the second coating assembly 20, and the first coating assembly 10 further comprises a tensioning roller 12, which is used to wrap the pole piece 200 and contact the second surface 202 of the pole piece 200, so that the first surface 201 of the pole piece 200 faces away from the tensioning roller 12, and the first coating die 11 is arranged on the outer periphery of the tensioning roller 12. By the tensioning action of the tensioning roller 12, the first surface 201 of the pole piece 200 can be exposed, and the pole piece 200 can be in a taut state, ensuring that the first surface 201 is flat and improving the coating effect. The first coating die 11 is arranged on the outer periphery of the tensioning roller 12, and the first coating die 11 can directly contact the pole piece 200 during coating, thereby achieving coating of the first surface 201 of the pole piece 200. The tensioning roller 12 can also stabilize the pole piece 200 and the first coating die 11, avoiding shaking of the pole piece 200 during coating, thereby reducing fluctuations in the distance between the pole piece 200 and the first coating die 11, improving the stability and uniformity of the coating. When the pole piece 200 is taut by the tensioning roller 12 and coated by the coating die on the exposed surface of the pole piece 200, it is necessary to consider that the surface of the pole piece 200 in contact with the tensioning roller 12 is dry (for example, no slurry is coated, or the slurry has been solidified after being coated), so as to avoid the problem that the un-solidified slurry on the contact surface of the pole piece 200 is wiped off. Therefore, in this embodiment, by arranging the first coating assembly 10 upstream of the second coating assembly 20, it can be ensured that the surface (the second surface 202) of the pole piece 200 in contact with the tensioning roller 12 is not coated with slurry, thereby avoiding wiping off of the un-solidified slurry. After the pole piece 200 is coated on the first surface 201, it is then moved to the second coating assembly 20, and the second coating die 21 can be used to coat the second surface 202 of the pole piece 200.
[0037] Of course, as an alternative implementation, the second surface 202 of the pole piece 200 can also be coated first by using the second coating assembly 20, and after the second surface of the pole piece 200 is coated, the surface of the pole piece 200 is dried, so that after the slurry is solidified, the pole piece 200 enters the first coating assembly 10, at this time, the first surface 201 is exposed by using the contact between the tension roller 12 and the second surface 202 of the pole piece 200, so as to complete the coating of the first surface 201. In this arrangement, the second coating assembly 20 can be arranged upstream of the first coating assembly 10.
[0038] In the second embodiment, please refer to Figures 4 to 6 , the first coating assembly 10 further comprises a transfer roller 13, the first coating die 11 is used to coat the slurry to the surface of the transfer roller 13, and the transfer roller 13 is used to surround the pole piece 200 and contact the first surface 201 of the pole piece 200. By coating the slurry on the surface of the transfer roller 13, not only can the slurry be transferred to the first surface 201 of the pole piece 200 by using the contact between the transfer roller 13 and the first surface 201 of the pole piece 200, thereby realizing the coating of the first surface 201, but also the transfer roller 13 can provide tension to the pole piece 200, thereby avoiding problems such as shaking of the pole piece 200 during coating, uneven coating, or coating failure, thereby improving the coating effect of the first surface 201 of the pole piece 200. In the arrangement of the present example, since the transfer roller 13 only contacts the first surface 201 and does not contact the second surface 202, whether the first surface 201 or the second surface 202 of the pole piece 200 is coated first, the surface that is coated first will not contact the tension roller 12 arranged downstream, so in the present example, the coating order of the first surface 201 and the second surface 202 can not be limited, that is, the upstream and downstream positions between the first coating assembly 10 and the second coating assembly 20 can be arranged arbitrarily, for example Figure 4 and Figure 5 shows that the first coating assembly 10 is arranged upstream of the second coating assembly 20, Figure 6 shows that the first coating assembly 10 is arranged downstream of the second coating assembly 20. Therefore, it can be seen that the arrangement of the present example can further improve the flexibility of the coating device 100.
[0039] In some embodiments, the transfer roller 13 and the second coating die 21 can be arranged in a horizontal direction (as shown in Figure 5 and Figure 6 or arranged in a vertical direction (as shown in Figure 4As shown in FIG. 1, the transfer roller 13 and the second coating die 21 can be arranged on the same horizontal plane, or there can be a vertical gap between the transfer roller 13 and the second coating die 21. The specific arrangement can be flexibly set according to actual needs, which is not limited in the present application.
[0040] In order to avoid the slurry on the transfer roller 13 not being completely transferred to the surface of the pole piece 200, and residual slurry being present on the surface of the transfer roller 13, when the coating die is coated on the transfer roller 13 again, the residual slurry and the newly coated slurry will be superimposed on each other, which will cause the thickness of the slurry to increase, and possibly exceed the thickness tolerance range of the slurry, resulting in the problem of uneven thickness of the slurry on the surface of the pole piece 200 and generating defective products. Therefore, in some embodiments, referring to Figure 5 and Figure 6 , the first coating assembly 10 further comprises a surplus scraper 14, which is arranged upstream of the first coating die 11 along the feeding direction of the transfer roller 13, and abuts against the surface of the transfer roller 13. By arranging the surplus scraper 14, the residual slurry on the surface of the transfer roller 13 can be scraped off before the transfer roller 13 is rotated to the first coating die 11 to be coated with slurry. In this way, it can be ensured that the surface of the transfer roller 13 is free of residual slurry when the first coating die 11 is coated on the transfer roller 13 each time, thereby ensuring the uniformity of the thickness of the slurry on the transfer roller 13, and enabling the surface of the pole piece 200 to be coated with slurry of uniform thickness, and improving the coating effect of the pole piece 200.
[0041] It can be understood that the coating machine can also be provided with a plurality of auxiliary rollers 30 to guide or adjust the transportation direction of the pole piece 200, so that the pole piece 200 can be smoothly transported in the coating machine. The number, specific arrangement, position, etc. of the auxiliary rollers 30 can be flexibly set according to needs, and the constitution and operation of the auxiliary rollers 30 have been recorded in the related art for those skilled in the art, which will not be described in detail here.
[0042] In a second aspect, the present application also provides a coating machine (not shown) comprising the coating device 100 provided in the first aspect. On the basis of the coating device 100, the coating machine can also be provided with a mounting structure for fixing the first coating assembly 10 and the second coating assembly 20, and a feeding device and a discharging device, etc. to enable the pole piece 200 to be transported into the first coating assembly 10 and the second coating assembly 20.
[0043] In the description of the application, if the description of the terms "one embodiment", "some examples", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" appears, it 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 application. In the description of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0044] The embodiments of the application described above in conjunction with the drawings are not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art in the technical field without departing from the purpose of the application.
[0045] In the description of the application, if the patent name appears as "and", it means "and" relationship, not "or" relationship. For example, the patent name is "one A, B", which means that the content claimed by the application is: the technical solution of the subject name A and the technical solution of the subject name B.
Claims
1. A coating apparatus characterized by: Comprising A first coating assembly comprising a first coating die for coating a first surface of the pole piece with the paste; A second coating assembly comprising a second coating die for abutting against a second surface of the pole piece, the second coating die having a discharge direction forming an acute angle with the extending direction of the pole piece; Wherein the second coating assembly is arranged upstream or downstream of the first coating assembly along the transporting direction of the pole piece.
2. The coating apparatus of claim 1, wherein: The second coating die is provided with a discharge port, the discharge port having the same direction as the moving direction of the pole piece, or the discharge port having the opposite direction as the moving direction of the pole piece.
3. The coating apparatus of claim 2, wherein: The acute angle between the discharge direction and the gravity direction is formed.
4. The coating apparatus of claim 1, wherein: The acute angle θ between the discharge direction of the second coating die and the extending direction of the pole piece satisfies 0 < θ ≤ 45°.
5. The coating apparatus of claim 1, wherein: The second coating die is provided with a discharge port and a support structure, the support structure being arranged upstream of the discharge port along the transporting direction of the pole piece, the support structure being used for abutting against the second surface of the pole piece.
6. The coating apparatus of claim 5, wherein: The support structure comprises a support block, the support block being protruded from the discharge port, and the surface of the support block for contacting the pole piece being an arc surface.
7. The coating apparatus according to any one of claims 1 to 6, characterized in that: The first coating assembly is arranged upstream of the second coating assembly, the first coating assembly further comprising a tension roller, the tension roller being used for wrapping around the pole piece and contacting the second surface of the pole piece, so that the first surface of the pole piece is away from the tension roller, the first coating die being arranged on the outer periphery of the tension roller.
8. The coating apparatus according to any one of claims 1 to 6, characterized in that: The first coating assembly further comprises a transfer roller, the first coating die being used for coating the paste to the surface of the transfer roller, the transfer roller being used for wrapping around the pole piece and contacting the first surface of the pole piece.
9. The coating apparatus of claim 8, wherein: The first coating assembly further comprises a surplus material scraper, the surplus material scraper being arranged upstream of the first coating die along the feeding direction of the transfer roller, the surplus material scraper abutting against the surface of the transfer roller.
10. A coater characterized by comprising: A coating device comprising any one of claims 1 to 9.