A coating device
By setting axially arranged heating elements on the outside of the coating roller, the temperature of the coating roller can be adjusted, thus solving the problem of uneven coating thickness and achieving uniform coating and consistent electrode coating.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SHANGSHUI INTELLIGENT CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-10
Smart Images
Figure CN224475211U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrode coating technology, and more particularly to a coating apparatus. Background Technology
[0002] Roll coating is a widely used coating process in thin film lamination, battery electrode preparation, and flexible electronics manufacturing. This process involves uniformly applying a slurry between two film layers and using the pressure between two relatively rotating rollers to form the desired coating on the substrate surface. However, this method suffers from poor coating uniformity, resulting in a thicker coating in the center and thinner coating at the edges. Utility Model Content
[0003] This application provides a coating apparatus that can solve the problem of coating thickness in the middle and thinness at both sides by setting a heating element on the radially outer side of the coating roller, thereby improving the uniformity of the coating.
[0004] In a first aspect, this application provides a coating apparatus, comprising at least two coating rollers arranged in parallel, wherein there is a gap between two adjacent coating rollers for passing an electrode sheet; and heating elements, wherein at least three heating elements are arranged along the axial direction of each coating roller on its radially outer side, the at least three heating elements being used to heat the outer peripheral surface of the coating roller.
[0005] In this application, each coating roller is provided with a heating element on its radial outer side for heating the outer peripheral surface of the coating roller. At least three heating elements are arranged along the axial direction of the coating roller on its outer side, thereby dividing the coating roller into multiple heating zones in the axial direction that can be individually controlled in temperature. According to the coating thickness distribution, the temperature of the corresponding part of the coating roller in the axial direction can be adjusted in a targeted manner, thereby controlling the thermal expansion of the coating roller, adjusting the gap between two adjacent coating rollers, and improving the consistency of electrode coating quality.
[0006] In one possible implementation, the at least three heating elements are symmetrically arranged in a radial section along the axial center of the coating roller. This application provides at least three heating elements symmetrically arranged along a symmetrical plane. This arrangement allows the heating elements to symmetrically heat the outer periphery of the coating roller, specifically adjusting the temperature difference between the axial center of the coating roller and other axial positions. This compensates for coating thickness variations caused by uneven slurry distribution, achieves consistent control of the gap between adjacent coating rollers, and improves the uniformity of the coating thickness.
[0007] In one possible implementation, the sum of the lengths of each heating element along the axial direction of the coating roller is greater than or equal to half the axial length of the coating roller. This can increase the heating range of the heating elements along the axial direction of the coating roller, which is beneficial to forming a more uniform temperature field distribution and avoids uneven thermal deformation of the coating roller due to excessive temperature difference between the heated and unheated areas.
[0008] In one possible implementation, the sum of the lengths of each heating element along the axial direction of the coating roller is less than the axial length of the coating roller, and the projection of each heating element along the axial direction of the coating roller is located within the projection of the coating roller. No separate heating elements are provided for the axial end regions of the coating roller. The coating edge regions corresponding to the axial end regions of the coating roller are relatively thinner than the central region. While ensuring coating uniformity, the required gap adjustment in this region is smaller, resulting in less thermal deformation and relatively lower heating requirements. Through the heat conduction effect of adjacent heating elements, auxiliary temperature control in this region can be achieved, thereby reducing the number of heating elements. Simultaneously, collisions or scratches between the heating elements and the electrode sheets can be avoided, improving the safety and stability of the coating device operation.
[0009] In one possible implementation, the distance between each heating element and the outer peripheral surface of the coating roller is equal along the radial direction of the coating roller. This ensures that the heat transfer path between each heating element and the coating roller is the same. Even if the heating temperatures of each heating element are different, the heating effect of each heating element on the coating roller is relatively consistent, thus improving the uniformity of heating.
[0010] In one possible implementation, the distance between the outer circumferential surface of the coating roller and the heating element along the radial direction of the coating roller is in the range of 5 mm to 15 mm. Within this distance range, the heating effect between the heating element and the coating roller is better and the heating efficiency is higher.
[0011] In one possible implementation, the heating element has a heating surface, which is an arc surface coaxial with the outer peripheral surface of the coating roller. The heating surface is used to heat the outer peripheral surface of the coating roller to ensure that the heating surface can be adapted to the outer peripheral surface of the coating roller, thereby increasing the heating area and heat transfer efficiency between the heating surface and the outer peripheral surface of the coating roller, achieving a uniform heating effect on the outer peripheral surface of the coating roller, and continuously heating the outer peripheral surface of the coating roller without interfering with the rotation of the coating roller, ensuring that the outer peripheral surface of the coating roller can be uniformly heated.
[0012] In one possible implementation, the length of each heating surface along the axial direction of the coating roller is equal. Each heating surface has the same heating area and heat input in the axial direction of the outer peripheral surface of the coating roller, thereby ensuring the uniformity of heating of the coating roller at different axial positions.
[0013] In one possible implementation, the arc length of each heating surface along the circumference of the coating roller is equal. Each heating surface has the same heating area and heat input in the circumferential direction of the outer circumferential surface of the coating roller, thereby ensuring the uniformity of heating of the coating roller at different circumferential positions.
[0014] In one possible implementation, the coating apparatus includes a sensor, the coating roller has a receiving cavity, and the sensor is located within the receiving cavity. The sensor, the outer circumferential surface of the coating roller, and the heating element are sequentially arranged along the radial direction of the coating roller. The sensor is used to detect the temperature of the outer circumferential surface of the coating roller. Each sensor corresponds one-to-one with each heating element, and each sensor is used to detect the temperature of the area of the outer circumferential surface of the coating roller heated by its corresponding heating element. This enables independent temperature monitoring of each heated area on the outer circumferential surface of the coating roller, ensuring uniform and controllable temperature distribution on the outer circumferential surface of the coating roller.
[0015] In one possible implementation, the heating element is an electromagnetic heating element. Electromagnetic heating has the advantages of high heating efficiency, fast response speed and high temperature control accuracy, which can ensure that the coating roller maintains a stable heating state during operation, making the gap adjustment between two adjacent coating rollers more precise and controllable, which is beneficial to improving the uniformity and consistency of electrode coating.
[0016] In one possible implementation, the coating apparatus includes a controller and a regulator. The controller is electrically connected to both the sensor and the regulator, and the regulator is electrically connected to the heating element. The controller controls the regulator to adjust the temperature of the heating element based on the sensor's detection results. The sensor, controller, regulator, and heating element work together to achieve real-time monitoring and adjustment of the temperature in various areas of the outer circumference of the coating roller. By precisely controlling the temperature of the heating element, the gap between two adjacent coating rollers can be adjusted, ensuring the consistency of the coating thickness. Attached Figure Description
[0017] Figure 1 A schematic diagram of the coating apparatus provided in the embodiments of this application;
[0018] Figure 2 for Figure 1 A side view of the coating roller and heating element of the coating apparatus;
[0019] Figure 3 for Figure 1 A schematic diagram of one of the coating rollers and its corresponding heating element in the coating apparatus;
[0020] Figure 4 for Figure 3 A top view of the coating roller and heating element;
[0021] Figure 5for Figure 1 Enlarged view of the coating roller and heating element of the coating device;
[0022] Figure 6 for Figure 1 A schematic diagram of the heating element in the coating device;
[0023] Figure 7 for Figure 1 A schematic diagram showing the relationship between the internal structure of the coating roller and the heating element in the coating device.
[0024] Figure 8 for Figure 1 A schematic diagram showing the relationship between the sensors, controllers, regulators, and heating elements in the coating apparatus.
[0025] Explanation of main reference numerals: 10-Coating device; 100-Coating roller; 101-Symmetry plane; 110-Gap; 120-Outer peripheral surface; 130-Receiving cavity; 200-Heating element; 300-Sensor; 400-Controller; 500-Regulator; 20-Electrode. Detailed Implementation
[0026] The embodiments of this application are described below with reference to the accompanying drawings.
[0027] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0028] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0029] It should be understood that the term "and / or" used in this document is merely a description of the same field in the related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0030] It should be understood that the terms "first," "second," etc., used in this application are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order.
[0031] In the description of this application, the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can be fixed connections, detachable connections, mating connections or integral connections; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0033] This application provides a coating apparatus, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the coating apparatus 10 provided in an embodiment of this application. Figure 2 for Figure 1 The coating apparatus 10 includes at least two coating rollers 100. The at least two coating rollers 100 are arranged in parallel, with a gap 110 between adjacent coating rollers 100 for the electrode 20 to pass through.
[0034] The number of coating rollers 100 is at least two, but can be two, three, four, or more. This embodiment of the application uses two coating rollers 100 as an example for illustration. Figure 1 As shown, there are two coating rollers 100, which are parallel in axis and have a gap 110 between them. Each coating roller 100 is used to transport the electrode sheet, allowing the electrode sheet 20 to pass through the gap 110 and move relative to the two coating rollers 100. Figure 1 The arrows in the diagram show the movement path of the electrode 20 as it passes the coating roller 100. The coating die applies slurry to the electrode 20, which is sandwiched between the two layers of electrode 20. As the coating roller 100 rotates, the slurry is carried into the gap 110, forming a coating of a certain thickness under the squeezing action of the two coating rollers 100.
[0035] like Figure 2 and Figure 3 As shown, Figure 3 for Figure 1A schematic diagram of one of the coating rollers 100 and its corresponding heating element 200 in the coating apparatus 10. The coating apparatus 10 also includes heating elements 200, and at least three heating elements 200 arranged along the axial direction of the coating roller 100 are provided on the radially outer side of each coating roller 100. The at least three heating elements 200 are used to heat the outer peripheral surface 120 of the coating roller 100.
[0036] In this embodiment, at least three heating elements 200 are arranged radially outside the coating roller 100 along the axial direction of the coating roller 100, and the at least three heating elements 200 are arranged in a straight line along the axial direction of the coating roller 100, with the line connecting the centers of each heating element 200 parallel to the axial direction of the coating roller 100.
[0037] In this embodiment, at least three heating elements 200 are arranged along the axial direction of the coating roller 100, with adjacent heating elements 200 in contact with each other. It is understood that although adjacent heating elements 200 are in contact, the wall thickness of each heating element 200 effectively isolates them, preventing heat transfer and thus avoiding temperature interference caused by heat conduction. This ensures that each heating element 200 can independently and stably heat the coating roller 100.
[0038] At least three heating elements 200 are used to heat the outer peripheral surface 120 of the coating roller 100. Each heating element 200 corresponds to heating a local area of the outer peripheral surface 120 of the coating roller 100. Thus, the outer peripheral surface 120 of the coating roller 100 is divided into different independent heating areas by the heating elements 200. Each area can be heated by each heating element 200 individually, so as to realize the zoned adjustment and precise control of the temperature of the outer peripheral surface 120 of the coating roller 100.
[0039] When the heating element 200 heats the outer peripheral surface 120 of the coating roller 100, the temperature of the outer peripheral surface 120 of the coating roller 100 increases, the kinetic energy of the molecules inside the outer peripheral surface 120 of the coating roller 100 increases, and the average distance between molecules increases, thereby triggering thermal expansion. This expansion manifests as a change in the radial dimension of the coating roller 100, which in turn causes a change in the gap 110 between two adjacent coating rollers 100. By controlling the heating temperature of the heating element 200, the amount of thermal deformation of the coating roller 100 can be regulated, thereby adjusting the gap between two adjacent coating rollers 100 and ensuring that the electrode located in the gap 110 obtains a consistent coating thickness during the coating process. For example, in areas with thicker coatings, by increasing the temperature of the heating element 200 in the corresponding coating section, the coating roller 100 in that area undergoes thermal expansion, reducing the gap between adjacent coating rollers 100, thereby reducing the coating thickness of the electrode 20 in that area. Conversely, in areas with thinner coatings, the temperature of the heating element 200 in the corresponding section can be decreased, reducing the amount of thermal expansion of the coating roller 100 in that section, thus increasing the coating thickness of the electrode 20 in that area. Furthermore, the temperature of the heating element 200 in areas with thinner coatings can be set lower than that in areas with thicker coatings, resulting in a smaller gap variation in areas with thinner coatings compared to areas with thicker coatings. By controlling the temperature of the heating element 200, the uniformity of the overall coating thickness of the electrode 20 can be optimized, improving the consistency of the electrode 20 coating quality.
[0040] In this application, each coating roller 100 is provided with a heating element 200 on its radial outer side for heating the outer peripheral surface 120 of the coating roller 100. At least three heating elements 200 are arranged along the axial direction of the coating roller 100 on its outer side, thereby dividing the coating roller 100 into multiple heating zones in the axial direction that can be individually controlled. The temperature of the corresponding part of the coating roller 100 in the axial direction can be adjusted in a targeted manner according to the coating thickness distribution, thereby controlling the thermal expansion of the coating roller 100, adjusting the gap between two adjacent coating rollers 100, and improving the consistency of the coating quality of the electrode 20.
[0041] In some other embodiments, such as Figure 1 As shown, the coating roller 100 rotates around the axis of the coating roller 100, and the heating element 200 is fixed on the bracket 600 to maintain a relatively stable state. The coating roller 100 rotates relative to the heating element 200 and continuously passes over the heating element 200, so that the heating element 200 heats the entire outer peripheral surface 120 of the coating roller 100.
[0042] One possible implementation, such as Figure 3As shown, at least three heating elements 200 are symmetrically arranged in a radial section along the axial center of the coating roller 100. The radial section along the axial center of the coating roller 100 is a symmetry plane 101. The at least three heating elements 200 are symmetrically arranged along the symmetry plane 101. Figure 3 It is shown in dashed lines.
[0043] During the extrusion molding of the slurry by two adjacent coating rollers 100, the slurry flows along the moving direction of the electrode 20 and continuously rolls up from the middle region of the coating roller 100 (i.e., the location of the symmetry plane 101) and diffuses towards both ends of the axial direction. This results in a larger accumulation of slurry in the middle region and relatively less slurry on both sides, thus forming a symmetrical distribution of coating thickness with "thick in the middle and thin at both sides". In this application, at least three heating elements 200 are symmetrically arranged along the symmetry plane 101. Through this arrangement of heating elements 200, the heating elements 200 can symmetrically heat the outer peripheral surface 120 of the coating roller 100, specifically adjust the temperature difference between the axial middle part and other axial positions of the coating roller 100, compensate for the coating thickness variation caused by uneven slurry distribution, achieve consistent control of the gap 110 between two adjacent coating rollers 100, and improve the uniformity of coating thickness.
[0044] In some other embodiments, the heating elements 200 arranged symmetrically in pairs along the plane of symmetry 101 have the same temperature. Since the thickness of the coating is symmetrically distributed along the plane of symmetry, that is, it exhibits a symmetrical change trend of "thick in the middle and thin on both sides", the heating elements 200 arranged symmetrically in pairs along the plane of symmetry 101 have the same temperature, which ensures that the heating effect received by the outer peripheral surface 120 of the coating roller 100 along the plane of symmetry 101 is symmetrical and consistent. At the same time, synchronous control can be achieved when adjusting the temperature, reducing the complexity and cost of temperature control.
[0045] In the embodiments of this application, such as Figure 3 As shown, five heating elements 200 are sequentially arranged on the radial outer side of each coating roller 100 along the axial direction of the coating roller 100. The five heating elements 200 are symmetrically distributed along the radial cross-section of the axial center of the coating roller 100. The temperature of the heating elements 200 shows a symmetrical distribution trend with the middle heating element 200 having a higher temperature and the heating elements 200 on both sides having a lower temperature. Furthermore, the temperature of the heating elements 200 decreases linearly. That is, along the axial direction of the coating roller 100, the third heating element 200, located in the middle of the five heating elements 200, has the highest temperature. The temperatures of the second and fourth heating elements 200 are equal to and lower than the temperature of the third heating element. The temperatures of the first and fifth heating elements are equal to and lower than the temperatures of the second and fourth heating elements.
[0046] Understandably, in some other embodiments, the first heating element 200 and the fifth heating element 200 may not heat the outer peripheral surface 120 of the coating roller 100. Alternatively, in some other embodiments, three heating elements 200 are sequentially arranged along the axial direction of each coating roller 100 on its radially outer side, and the three heating elements 200 are symmetrically distributed along the radial cross-section at the axial center of the coating roller 100. The temperature of the heating elements 200 exhibits a symmetrical distribution trend, with the middle heating element 200 having a higher temperature and the two outer heating elements 200 having a lower temperature, and the temperature of the heating elements 200 decreases linearly.
[0047] One possible implementation, such as Figure 4 As shown, Figure 4 for Figure 3 A top view of the coating roller 100 and heating element 200 shows that the sum of the lengths of each heating element 200 along the axial direction of the coating roller 100 is greater than or equal to half the axial length of the coating roller 100. In this application, the lengths of each heating element 200 along the axial direction of the coating roller 100 are all equal. In some other embodiments, the lengths of each heating element 200 along the axial direction of the coating roller 100 may be unequal. The axial length of the coating roller 100 is A, and the sum of the lengths of each heating element 200 along the axial direction of the coating roller 100 is L1, where L1 is greater than or equal to half of A. The total length of all heating elements 200 along the axial direction of the coating roller 100 is at least half the length of the coating roller 100, which can increase the heating range of the heating elements 200 along the axial direction of the coating roller 100, which is beneficial to forming a more uniform temperature field distribution and avoiding excessive temperature difference between the heated and unheated areas, thus preventing uneven thermal deformation of the coating roller 100.
[0048] One possible implementation, such as Figure 2 and Figure 4 As shown, the sum of the lengths of each heating element 200 along the axial direction of the coating roller 100 is less than the axial length of the coating roller 100, and the projection of each heating element 200 along the axial direction of the coating roller 100 is located within the projection of the coating roller 100.
[0049] In this embodiment, the length of each heating element 200 along the axial direction of the coating roller 100 is equal. In some other embodiments, the length of each heating element 200 along the axial direction of the coating roller 100 may be unequal. The axial length of the coating roller 100 is A, and the sum of the lengths of each heating element 200 along the axial direction of the coating roller 100 is L1, where L1 is less than A. The projection of each heating element 200 along the axial direction of the coating roller 100 is within the projection of the coating roller 100, meaning that each heating element 200 does not protrude beyond the coating roller 100. The sum of the lengths of each heating element 200 along the axial direction of the coating roller 100 is less than the axial length of the coating roller 100, and each heating element 200 does not protrude beyond the coating roller 100. No separate heating elements 200 are provided for heating the axial end regions of the coating roller 100. The coating edge regions corresponding to the axial end regions of the coating roller 100 are relatively thinner than the central region. While ensuring coating uniformity, the required gap 110 adjustment in this region is small, resulting in less thermal deformation and relatively lower heating requirements. Through the heat conduction effect of adjacent heating elements 200, auxiliary temperature control in this region can be achieved, thereby reducing the number of heating elements 200. Simultaneously, collisions or scratches between the heating elements 200 and the electrode 20 can be avoided, improving the safety and stability of the coating apparatus 10.
[0050] In some other embodiments, such as Figure 2 As shown, the radial projection of each heating element 200 onto the coating roller 100 is located within the projection of the coating roller 100. The radial length of the region of the radial projection of each heating element 200 onto the coating roller 100 is less than the diameter of the coating roller 100. The heating elements 200 are positioned radially outside the coating roller 100, and the electrode 20 moves on the outer circumferential surface 120 of the coating roller 100. The radial projection of each heating element 200 onto the coating roller 100 is located within the projection of the coating roller 100. The positioning of the heating elements 200 will not interfere with the movement of the electrode 20, avoiding collisions or scratches with the electrode 20, and improving the safety and stability of the coating apparatus 10.
[0051] In one possible implementation, each heating element 200 is equidistant from the outer peripheral surface 120 of the coating roller 100 along the radial direction of the coating roller 100. For example... Figure 5 As shown, Figure 5 for Figure 1An enlarged view of the coating roller 100 and heating element 200 in the coating apparatus 10 shows that the distance between the heating element 200 and the outer peripheral surface 120 of the coating roller 100 along the radial direction is L2. At least three heating elements 200 arranged axially along the coating roller 100 are provided on the radially outer side of the coating roller 100. Each heating element 200 is used to heat the outer peripheral surface 120 of the coating roller 100. The distance between each heating element 200 and the outer peripheral surface 120 of the coating roller 100 along the radial direction is kept consistent, which can ensure that the heat transfer path between each heating element 200 and the coating roller 100 is the same. Even if the heating temperatures of each heating element 200 are different, the heating effect of each heating element 200 on the coating roller 100 can be relatively consistent, thus improving the uniformity of heating.
[0052] One possible implementation, such as Figure 5 As shown, the distance between the outer peripheral surface 120 of the coating roller 100 and the heating element 200 along the radial direction of the coating roller 100 is in the range of 5 mm to 15 mm. For example, the distance between the outer peripheral surface 120 of the coating roller 100 and the heating element 200 along the radial direction of the coating roller 100 is 5 mm, 7 mm, 10 mm, 12 mm and 15 mm, etc.
[0053] If the distance between the outer peripheral surface 120 of the coating roller 100 and the heating element 200 is too close along the radial direction of the coating roller 100, it can easily lead to localized overheating of the coating roller 100, causing deformation or even cracking of the roller body. If the distance between the outer peripheral surface 120 of the coating roller 100 and the heating element 200 is too far along the radial direction of the coating roller 100, it can easily lead to low heating efficiency of the heating element 200, resulting in wasted heating resources. The distance between the outer peripheral surface 120 of the coating roller 100 and the heating element 200 is in the range of 5 mm to 15 mm. Within this distance range, the heating effect between the heating element 200 and the coating roller 100 is better and the heating efficiency is higher.
[0054] One possible implementation, such as Figure 6 As shown, Figure 6 for Figure 1 A schematic diagram of the heating element 200 of the coating apparatus 10 is shown. The heating element 200 has a heating surface 210, which faces the outer peripheral surface 120 of the coating roller 100 and is used to heat the outer peripheral surface 120 of the coating roller 100. The heating surface 210 is arc-shaped and coaxial with the outer peripheral surface 120 of the coating roller 100, ensuring that the heating surface 210 can be adapted to the outer peripheral surface 120 of the coating roller 100, thereby increasing the heating area and heat transfer efficiency between the heating surface 210 and the outer peripheral surface 120 of the coating roller 100, and achieving a uniform heating effect on the outer peripheral surface 120 of the coating roller 100.
[0055] In addition, during operation, the coating roller 100 rotates relative to the heating element 200. The heating surface 210 of the heating element 200 continuously heats the coating roller 100 passing through the heating surface 210. The heating surface 210 is an arc surface coaxial with the outer peripheral surface 120 of the coating roller 100, which can continuously heat the outer peripheral surface 120 of the coating roller 100 without interfering with the rotation of the coating roller 100, ensuring that the outer peripheral surface 120 of the coating roller 100 can be uniformly heated.
[0056] One possible implementation, such as Figure 6 As shown, the length of each heating surface 210 along the axial direction of the coating roller 100 is equal. This equal length ensures that when each heating element 200 heats the outer peripheral surface 120 of the coating roller 100, each heating surface 210 has the same heating area and heat input in the axial direction of the outer peripheral surface 120, thereby guaranteeing the uniformity of heating of the coating roller 100 at different axial positions.
[0057] One possible implementation, such as Figure 5 As shown, the arc length of each heating surface 210 along the circumference of the coating roller 100 is equal. The heating surface 210 is an arc surface and matches the outer circumferential surface 120 of the coating roller 100. The equal arc length of each heating surface 210 along the circumferential direction of the coating roller 100 ensures that when each heating element 200 heats the outer circumferential surface 120 of the coating roller 100, each heating surface 210 has the same heating area and heat input in the circumferential direction of the outer circumferential surface 120 of the coating roller 100, thereby ensuring the uniformity of heating of the coating roller 100 at different circumferential positions.
[0058] In some other embodiments, the length of each heating surface 210 along the axial direction of the coating roller 100 is equal, and the arc length of each heating surface 210 along the circumferential direction of the coating roller 100 is also equal. Thus, the area of the heating surface 210 of each heating element 200 is equal. When each heating element 200 heats the outer peripheral surface 120 of the coating roller 100, it can ensure that the heating area of each heating element 200 on the outer peripheral surface 120 of the coating roller 100 is consistent, avoiding temperature deviation caused by differences in heating area and improving heating uniformity.
[0059] One possible implementation, such as Figure 7 As shown, Figure 7 for Figure 1The diagram shows the relationship between the internal structure of the coating roller 100 and the heating element 200 in the coating apparatus 10. The coating apparatus 10 includes a sensor 300. The coating roller 100 is provided with a receiving cavity 130. The sensor 300 is located in the receiving cavity 130. The sensor 300, the outer peripheral surface 120 of the coating roller 100 and the heating element 200 are arranged in sequence along the radial direction of the coating roller 100. The sensor 300 is used to detect the temperature of the outer peripheral surface 120 of the coating roller 100.
[0060] At least three heating elements 200 are arranged radially on the outer side of the coating roller 100, and these three heating elements 200 are arranged axially along the coating roller 100. Each heating element 200 is used to heat a different area of the outer peripheral surface 120 of the coating roller 100. Sensors 300 are disposed inside the coating roller 100 and are used to detect the temperature of the outer peripheral surface 120 of the coating roller 100. The number of sensors 300 is the same as the number of heating elements 200, and each sensor 300 corresponds one-to-one with each heating element 200. Each sensor 300 is used to detect the temperature of the area of the outer peripheral surface 120 of the coating roller 100 heated by its corresponding heating element 200, thereby realizing independent temperature monitoring of each heated area of the outer peripheral surface 120 of the coating roller 100 and ensuring uniform and controllable temperature distribution on the outer peripheral surface 120 of the coating roller 100.
[0061] In one possible implementation, the heating element 200 is an electromagnetic heating element, and each heating element 200 includes at least one set of electromagnetic coils. The coating roller 100 is usually made of metal material. When the electromagnetic coil is energized, it generates an alternating magnetic field at its corresponding coating roller 100, thereby inducing eddy currents and generating heat to heat the coating roller 100.
[0062] Electromagnetic heating is used to heat the coating roller 100, utilizing the thermal expansion characteristics of metallic materials to control the gap between adjacent coating rollers 100. Electromagnetic heating features high heating efficiency, fast response speed, and high temperature control accuracy, ensuring that the coating roller 100 maintains a stable heating state during operation. This makes the gap adjustment between adjacent coating rollers 100 more precise and controllable, which is beneficial to improving the uniformity and consistency of the coating on the electrode 20.
[0063] One possible implementation, such as Figure 1 and Figure 8 As shown, Figure 8 for Figure 1The diagram shows the relationship between the sensor 300, controller 400, regulator 500, and heating element 200 in the coating apparatus 10. The coating apparatus 10 includes a controller 400 and a regulator 500. The controller 400 is electrically connected to both the sensor 300 and the regulator 500. The regulator 500 is electrically connected to the heating element 200. The controller 400 controls the regulator 500 to adjust the temperature of the heating element 200 based on the detection result of the sensor 300.
[0064] When each heating element 200 heats the outer peripheral surface 120 of the coating roller 100, the sensor 300 detects the temperature of each heated area on the outer peripheral surface 120 of the coating roller 100 in real time and feeds the detected data back to the controller 400. The controller 400 receives the temperature detection values from each sensor 300 and compares them with the preset target temperature to determine whether the current heating state meets the process requirements and whether the temperature of the heating element 200 needs to be adjusted. If there is a deviation between the detected temperature and the target temperature, the controller 400 calculates the required temperature adjustment amount and generates a corresponding control command, which is transmitted to the corresponding regulator 500. The regulator 500 adjusts the heating power of the corresponding heating element 200 (e.g., adjusts the voltage or current) according to the command output by the controller 400 to adjust the heating temperature of the corresponding heating element 200, thereby achieving precise control of the temperature of each heated area on the outer peripheral surface 120 of the coating roller 100. The sensor 300, controller 400, regulator 500 and heating element 200 work together to achieve real-time monitoring and adjustment of the temperature of each area on the outer periphery 120 of the coating roller 100. By precisely controlling the temperature of the heating element 200, the gap 110 between two adjacent coating rollers 100 can be adjusted to ensure the consistency of the coating thickness.
[0065] In some other embodiments, the heating element 200 is an electromagnetic heating element, and the controller 400 adjusts the electromagnetic field strength generated by each heating element 200 by controlling the current output of the regulator 500, thereby controlling the temperature of each heating element 200.
[0066] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A coating apparatus (10), characterized in that, include: At least two coating rollers (100) are arranged in parallel, wherein there is a gap (110) between two adjacent coating rollers (100) for passing through the electrode sheet (20). Heating elements (200): Each of the coating rollers (100) has at least three heating elements (200) arranged along the axial direction of the coating roller (100) on its radially outer side. The at least three heating elements (200) are used to heat the outer peripheral surface (120) of the coating roller (100).
2. The coating apparatus (10) according to claim 1, characterized in that, The at least three heating elements (200) are symmetrical about the radial section of the axial center of the coating roller (100).
3. The coating apparatus (10) according to claim 1, characterized in that, The sum of the lengths of each of the heating elements (200) along the axial direction of the coating roller (100) is greater than or equal to half the axial length of the coating roller (100).
4. The coating apparatus (10) according to claim 1, characterized in that, The sum of the lengths of each heating element (200) along the axial direction of the coating roller (100) is less than the axial length of the coating roller (100), and the projection of each heating element (200) along the axial direction of the coating roller (100) is located within the projection of the coating roller (100).
5. The coating apparatus (10) according to claim 1, characterized in that, Each of the heating elements (200) is equidistant from the outer peripheral surface (120) of the coating roller (100) along the radial direction of the coating roller (100).
6. The coating apparatus (10) according to claim 5, characterized in that, The distance between the outer peripheral surface (120) of the coating roller (100) and the heating element (200) along the radial direction of the coating roller (100) is in the range of 5 mm to 15 mm.
7. The coating apparatus (10) according to claim 1, characterized in that, The heating element (200) has a heating surface (210), which is an arc surface coaxial with the outer peripheral surface (120) of the coating roller (100). The heating surface (210) is used to heat the outer peripheral surface (120) of the coating roller (100).
8. The coating apparatus (10) according to claim 7, characterized in that, The length of each of the heating surfaces (210) along the axial direction of the coating roller (100) is equal.
9. The coating apparatus (10) according to claim 7, characterized in that, The arc length of each of the heating surfaces (210) along the circumference of the coating roller (100) is equal.
10. The coating apparatus (10) according to any one of claims 1-9, characterized in that, The coating apparatus (10) includes a sensor (300), the coating roller (100) is provided with a receiving cavity (130), the sensor (300) is located in the receiving cavity (130), the sensor (300), the outer peripheral surface (120) of the coating roller (100) and the heating element (200) are arranged in sequence along the radial direction of the coating roller (100), and the sensor (300) is used to detect the temperature of the outer peripheral surface (120) of the coating roller (100).