A coating apparatus
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-16
Smart Images
Figure CN224358781U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery manufacturing technology, and in particular to a coating device. Background Technology
[0002] Coating is a process of applying coating to a substrate to form a coating layer in order to prepare the target material. In the battery manufacturing process, coating can be used to prepare battery electrodes. After the electrode substrate is coated on both sides, it needs to be sent to an oven for heating and drying to form a coating layer.
[0003] In thicker coatings on the substrate surface, prolonged heating of the coating is usually required, which can cause heat to accumulate on the coating and lead to problems such as cracking, thus affecting the quality of the electrode. Utility Model Content
[0004] This application provides a coating apparatus designed to improve the quality of electrode sheets.
[0005] To solve the above problems, this application provides the following technical solution:
[0006] This utility model provides a coating equipment, which includes: an unwinding machine, a coating machine, an oven, and a rewinding machine;
[0007] The unwinding machine is used to release the substrate;
[0008] The coating machine includes: a first front coating machine, a first rear coating machine, a second front coating machine, and a second rear coating machine arranged sequentially along the conveying direction of the substrate; the first front coating machine and the first rear coating machine are used to coat a coating on a first side of the substrate, and the second front coating machine and the second rear coating machine are used to coat a coating on a second side of the substrate.
[0009] The oven includes: a first front oven, a first rear oven, a second front oven, and a second rear oven arranged sequentially along the conveying direction of the substrate; the first front oven is located between the first front coating machine and the first rear coating machine, the first rear oven is located between the second front coating machine and the second rear coating machine, the second front oven is located between the second front coating machine and the second rear coating machine, and the second rear oven is located on the side of the second rear coating machine opposite to the second front oven;
[0010] The winding machine is used to collect the substrate after the coating operation has been completed.
[0011] Optionally, along the conveying direction of the substrate, the winding machine is located at the end of the conveying direction of the substrate, and an infrared drying device is also provided between the second rear oven and the winding machine;
[0012] The infrared drying device includes a first infrared drying component, a second infrared drying component, and a first roller; a plurality of first rollers are arranged sequentially along the conveying direction of the substrate for conveying the substrate, and the first infrared drying component and the second infrared drying component are arranged on opposite sides of the first roller.
[0013] Optionally, the first infrared drying assembly includes a plurality of first infrared dryers, which are arranged sequentially along the conveying direction of the substrate, and the temperature of the plurality of first infrared dryers increases along the conveying direction of the substrate.
[0014] And / or, the second infrared drying assembly includes a plurality of second infrared dryers arranged sequentially along the conveying direction of the substrate, and the temperature of the plurality of second infrared dryers increases along the conveying direction of the substrate.
[0015] Optionally, the first infrared drying assembly faces a first side of the substrate, and the second infrared drying assembly faces a second side of the substrate;
[0016] The first infrared drying assembly includes a plurality of first infrared dryers, and the second infrared drying assembly includes a plurality of second infrared dryers, wherein the number of first infrared dryers is less than the number of second infrared dryers.
[0017] Optionally, the first infrared drying component is disposed opposite to the second infrared drying component, and the first infrared drying component is located below the second infrared drying component, with the first infrared dryer and the first roller arranged alternately at intervals.
[0018] Optionally, along the conveying direction of the substrate, the first infrared dryer in the first infrared drying assembly is located after the first second infrared dryer in the second infrared drying assembly.
[0019] Optionally, the coating equipment is divided into upper and lower layers;
[0020] The first front coating machine, the first front drying oven, the first rear coating machine, and the first rear drying oven are sequentially arranged on the lower layer of the coating equipment; the second front coating machine, the second front drying oven, the second rear coating machine, and the second rear drying oven are sequentially arranged on the upper layer of the coating equipment.
[0021] The substrate is conveyed in the opposite direction to the substrate conveyed in the upper layer of the coating equipment.
[0022] Optionally, the oven includes a plurality of second rollers and a plurality of drying nozzles; the second rollers are used to convey the substrate, and the drying nozzles are used to discharge hot air to the surface of the substrate to dry the coating on the surface of the substrate; the second rollers and the drying nozzles are arranged alternately at intervals; the drying nozzles face the interval between the second rollers.
[0023] Optionally, along the conveying direction of the substrate, the operating temperature gradient of each of the plurality of drying nozzles increases.
[0024] Optionally, the coating equipment further includes multiple guide rollers arranged sequentially along the conveying direction of the substrate. The conveying line formed by the guide rollers is used to convey the substrate. The unwinding machine and the rewinding machine are located on the same side of the coating equipment, and the unwinding machine and the rewinding machine are located in the lower layer of the coating equipment.
[0025] Compared with the prior art, the embodiments of this application have the following advantages:
[0026] The coating equipment provided in this embodiment includes an unwinding machine, a coating machine, an oven, and a rewinding machine. The substrate to be coated is released through the unwinding machine, coated by the coating machine, dried in the oven, and finally collected by the rewinding machine. The coating machine is sequentially divided into a first front coating machine, a first rear coating machine, a second front coating machine, and a second rear coating machine along the conveying direction of the substrate, and correspondingly equipped with a first front oven, a first rear oven, a second front oven, and a second rear oven. In this embodiment, independent front coating machines, front ovens, and rear coating machines are respectively provided for opposite sides of the substrate. The subsequent drying oven breaks down the coating process. The front coating machine and front drying oven prepare the coating closest to the substrate, while the rear coating machine and rear drying oven prepare the coating further away from the substrate. By performing the coating and corresponding drying operations in segments, the substrate can be cooled between multiple ovens during coating preparation, avoiding heat accumulation and thus preventing damage to the coating structure. On the other hand, segmented coating and drying reduce the size requirements of the ovens, improve the adaptability of the coating machines and ovens to the available space, reduce the footprint of the coating equipment, and enhance the flexibility of the coating equipment deployment.
[0027] In this embodiment of the invention, by performing the coating operation and the corresponding drying operation in segments, the problems of substrate damage and inflexible equipment deployment caused by excessively long drying ovens in related technologies are solved.
[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0029] Figure 1This is a side view of a coating device provided in an embodiment of the present invention;
[0030] Figure 2 This is a side view of the unwinding machine in an embodiment of this utility model;
[0031] Figure 3 This is a side view of the coating machine in an embodiment of this utility model;
[0032] Figure 4 This is a side view of the winding machine in an embodiment of this utility model;
[0033] Figure 5 This is a side view of the oven structure in an embodiment of this utility model.
[0034] The components include: 1. Unwinder; 2. Coating machine; 3. Oven; 4. Rewinder; 5. Substrate; 6. Infrared drying device; 7. Overhead roller; 21. First front coating machine; 22. First rear coating machine; 23. Second front coating machine; 24. Second rear coating machine; 25. Rubber roller; 26. Steel roller; 27. Extrusion die; 28. Feeding system; 31. First front oven; 32. First rear oven; 33. Second front oven; 34. Second rear oven; 35. Second roller; 36. Drying nozzle; 37. Blower; 61. First infrared drying assembly; 62. Second infrared drying assembly; 63. First roller; 611. First infrared dryer; 621. Second infrared dryer. Detailed Implementation
[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0036] In the process of preparing electrode sheets through coating, an oven in the coating equipment is needed to heat the substrate coated with paint to maintain the solvent in the paint at an ideal level, thereby forming a coating with the required electrical properties. In high-coating-weight scenarios, due to the large amount of paint on the electrode substrate and the high total amount of solvent in the paint, insufficient drying will result in significant solvent residue, affecting the electrode's performance. Therefore, related technologies increase the length of the oven and extend the drying time to meet the drying requirements in high-coating-weight scenarios. However, the applicant has found the following problems with increasing the length of the oven:
[0037] On the one hand, prolonged heating of the substrate can cause heat to accumulate on the substrate, potentially damaging its structure. Prolonged high-temperature drying of the coating can cause excessive evaporation of the solvent in the coating, resulting in significant drying stress within the coating and causing the electrode to crack. On the other hand, the long drying oven requires a large overall space for the coating equipment, making it less flexible to deploy in a fixed area and increasing additional adaptation and adjustment costs.
[0038] To address the aforementioned problems, this utility model provides a coating device, referring to... Figure 1 , Figure 1 This is a side view of a coating apparatus according to an embodiment of the present invention. The coating apparatus includes: an unwinding machine 1, a coating machine 2, an oven 3, and a rewinding machine 4. The unwinding machine 1 is used to release a substrate 5. The coating machine 2 includes: a first front coating machine 21, a first rear coating machine 22, a second front coating machine 23, and a second rear coating machine 24 arranged sequentially along the conveying direction of the substrate 5. The first front coating machine 21 and the first rear coating machine 22 are used to coat the first side of the substrate 5 with a coating, and the second front coating machine 23 and the second rear coating machine 24 are used to coat the second side of the substrate 5 with a coating. The oven 3 includes: along the substrate 5... The first front drying oven 31, the first rear drying oven 32, the second front drying oven 33, and the second rear drying oven 34 are arranged sequentially in the conveying direction. The first front drying oven 31 is located between the first front coating machine 21 and the first rear coating machine 22. The first rear drying oven 32 is located between the second front coating machine 23 and the second rear coating machine 24. The second front drying oven 33 is located between the second front coating machine 23 and the second rear coating machine 24. The second rear drying oven 34 is located on the side of the second rear coating machine 24 away from the second front drying oven 33. The winding machine 4 is located at the end of the conveying direction of the substrate 5. The winding machine 4 is used to collect the substrate 5 after the coating operation is completed.
[0039] Combined with reference Figure 1 , Figure 2 and Figure 3 , Figure 2 This is a side view of the unwinding machine 1 in an embodiment of the present invention. Figure 3 This is a side view of the winding machine 4 in this embodiment of the present invention; the substrate 5 is fed into the coating machine 2 of the coating equipment by the unwinding machine 1, and then collected by the winding device after being heated by the oven 3; in view of the problems in the above-mentioned related technologies, the present invention sets the coating machine 2 and the oven 3 in the coating equipment in sections.
[0040] The coating machine 2 includes a first front coating machine 21, a first rear coating machine 22, a second front coating machine 23, and a second rear coating machine 24. The first front coating machine 21 and the first rear coating machine 22 are used to coat the first side of the substrate 5 with coating, and the first front coating machine 21 and the second rear coating machine 24 are used to coat the second side of the substrate 5 with coating. The first side and the second side are two opposite surfaces of the substrate 5. The oven 3 includes a first front oven 31, a first rear oven 32, a second front oven 33, and a second rear oven 34, which are connected along the conveyor belt of the substrate 5. In terms of feeding direction, the oven 3 is set after the corresponding coating machine 2, that is, the first front oven 31 is set between the first front coating machine 21 and the first rear coating machine 22, the first rear oven 32 is set between the second front coating machine 23 and the second rear coating machine 24, the second front oven 33 is set between the second front coating machine 23 and the second rear coating machine 24, and the second rear oven 34 is set on the side of the second rear coating machine 24 away from the second front oven 33; with this arrangement, at least two sets of coating machines 2 and ovens 3 are configured for each of the opposite sides of the substrate 5.
[0041] After being released from the unwinding machine 1, the substrate 5 first enters the first pre-coating machine 21 to coat a portion of the coating on the first side of the substrate 5. Then, the substrate 5 enters the first pre-drying oven 31 to dry the coating applied in the first pre-coating machine 21, forming at least a partial coating on the first side of the substrate 5. Afterward, the substrate 5 enters the first post-coating machine 22 to coat the already coated first side of the substrate 5 with coating again. Next, the substrate 5 enters the first post-drying oven 32 to dry the newly coated first side of the substrate 5, thus forming a complete coating on the first side of the substrate 5. Afterward, the substrate 5 enters the second pre-coating machine 23 to... A portion of the coating is applied to the second side of the substrate 5. The substrate 5 then enters the second pre-drying oven 33 to dry the coating applied to the substrate 5 in the second pre-coating machine 23, forming at least a partial coating on the second side of the substrate 5. After that, the substrate 5 enters the second post-coating machine 24 to apply the coating again to the second side of the substrate 5 that has already been coated. Then, the substrate 5 enters the second post-drying oven 34 to dry the newly applied coating on the second side of the substrate 5, thereby forming a complete coating on the second side of the substrate 5. At this point, the coating operation on both the first and second sides of the substrate 5 is completed, forming a complete coating. The substrate 5 is finally handed over to the winding machine 4 for collection.
[0042] The quantities of the first front coating machine 21, the first rear coating machine 22, the second front coating machine mechanism, and the second thick coating machine 2 can be as follows: Figure 1As shown, one or more can be set simultaneously. For example, two of each of the first front coating machine 21, the first rear coating machine 22, the second front coating machine mechanism, and the second thick coating machine 2 can be set. The number of ovens 3 is the same as the number of coating machines 2. The positional relationship can be referred to the description of the positional relationship between coating machines 2 and ovens 3 in the above embodiment. It should be noted that when multiple coating mechanisms are set simultaneously, the positional relationship between coating machines 2 remains unchanged. That is, along the conveying direction of the substrate 5, they are in the following order: all of the first front coating machines 21, all of the first rear coating machines 22, all of the second front coating machines 23, and all of the second rear coating machines 24.
[0043] The front coating machine 2 (first front coating machine 21, second front coating machine 23) and the rear coating machine 2 (first rear coating machine 22, second rear coating machine 24) can be divided according to the preset target coating weight of each side of the substrate 5; for example, for a certain substrate 5, the target coating weight of the first side is 900mg / 1540.25mm. 2 In the coating machine 2 used for coating the first side, the coating machine 2 used for coating the first 40% of the paint is the first front coating machine 21 (i.e., the coating weight of the first front coating machine 21 is 360mg / 1540.25mm). 2 The coating machine 2, used to coat the remaining 60% of the paint, is the first post-coating machine 22 (i.e., the coating weight of the first post-coating machine 22 is 540mg / 1540.25mm). 2 For example, if the coating weight of the first front coating machine 21 is a% of the target coating weight on the first side (preferably, 40≤a≤60), then the coating weight of the first rear coating machine 22 is b% of the target coating weight on the first side (b=100-a); the division setting method of the second front coating machine 23 and the second rear coating machine 24 is the same as the division setting method of the first front coating machine 21 and the first rear coating machine 22, and will not be repeated here.
[0044] It should be noted that the coating weight of the first front coating machine 21 and the first rear coating machine 22, respectively, relative to the target coating weight of the first side of the substrate 5, may differ from the coating weight of the second front coating machine 23 and the second rear coating machine 24, respectively, relative to the target coating weight of the second side of the substrate 5. For example, the coating weight of the first front coating machine 21 and the first rear coating machine 22, respectively, relative to the target coating weight of the first side of the substrate 5, may be 40% and 60%, respectively, while the coating weight of the second front coating machine 23 and the second rear coating machine 24, respectively, relative to the target coating weight of the second side of the substrate 5, may be 50% and 50%, respectively.
[0045] Because the coating machine 2 and the oven 3 are segmented, the oven 3 can heat and dry the coated part of the coating after the coating machine 2 has completed the coating operation. This reduces the thickness of the coating processed in each coating operation and heating and drying operation, so that the coating on the inner side (closer to the substrate 5) is heated and dried for a longer time, and the coating on the outer side is heated and dried for a shorter time. This reduces the gradient difference of solvent evaporation on the inner and outer sides of the coating, and ensures that all coatings on the substrate 5 are fully and appropriately heated and dried.
[0046] Combined with reference Figure 1 and Figure 4 , Figure 3 This is a side view of the coating machine 2 in this embodiment of the present invention. The coating machine 2 includes a rubber roller 25, a steel roller 26, an extrusion die 27, and a feeding system 28. The diameter of the steel roller 26 is larger than the diameter of the rubber roller 25. Along the conveying direction of the substrate 5, the rubber roller 25 and the extrusion die 27 are sequentially arranged to contact the steel roller 26. The rubber roller 25 and the steel roller 26 are used to change the conveying direction of the substrate 5 and cause the substrate 5 to undergo continuous plastic deformation, so as to stretch and adhere to the surface of the steel roller 26 for coating. The feeding system 28 is connected to the extrusion die 27, which is used to extrude the substrate 5 adhered to the surface of the steel roller 26, so that the coating in the feeding system 28 is applied to the surface of the substrate 5. By controlling the discharge rate of the feeding system 28, the coating weight of the coating machine 2 can be controlled, thereby further realizing segmented coating operation.
[0047] For example, the electrode prepared by the coating equipment is a lithium iron phosphate (LiFePO4, LFP) electrode, the substrate 5 is aluminum foil, and the solvent in the coating is N-methylpyrrolidone (NMP).
[0048] The coating equipment provided in this embodiment includes an unwinding machine, a coating machine, an oven, and a rewinding machine. The substrate to be coated is released through the unwinding machine, coated by the coating machine, dried in the oven, and finally collected by the rewinding machine. The coating machine is sequentially divided into a first front coating machine, a first rear coating machine, a second front coating machine, and a second rear coating machine along the conveying direction of the substrate, and correspondingly equipped with a first front oven, a first rear oven, a second front oven, and a second rear oven. In this embodiment, for each side of the substrate, an independent front coating machine, a front oven, a rear coating machine, and a rear oven are provided. The drying oven enables the segmentation of the coating operation. The front coating machine and front drying oven prepare the coating near the substrate, while the rear coating machine and rear drying oven prepare the coating away from the substrate. By performing the coating operation and the corresponding drying operation in segments, the substrate can be cooled between multiple drying ovens during coating preparation, avoiding heat accumulation and thus preventing damage to the substrate structure. On the other hand, segmented coating and drying reduce the size requirements of the drying oven, improve the adaptability of the coating machine and drying oven to the site space, reduce the footprint of the coating equipment, and enhance the flexibility of the coating equipment deployment.
[0049] In one embodiment, reference is made to Figure 1 Along the conveying direction of the substrate 5, an infrared drying device 6 is also provided between the second rear drying oven 34 and the winding machine 4; the infrared drying device 6 includes a first infrared drying component 61, a second infrared drying component 62 and a first roller 63; a plurality of first rollers 63 are arranged sequentially along the conveying direction of the substrate 5 for conveying the substrate 5, and the first infrared drying component 61 and the second infrared drying component 62 are arranged on opposite sides of the first roller 63.
[0050] The coating equipment provided in this embodiment of the present invention also includes an infrared drying device 6; between the second rear oven 34 and the winding machine 4 along the conveying direction of the substrate 5; a plurality of first rollers 63 are provided inside the infrared drying device 6 along the conveying direction of the substrate 5, and the substrate 5 moves inside the infrared drying device 6 through the first rollers 63; a first infrared drying component 61 and a second infrared drying component 62 are respectively provided on opposite sides (both sides along the conveying direction) of the first rollers 63, which are used to perform infrared drying on the first side and the second side of the moving substrate 5, respectively.
[0051] After the coating on the substrate 5 is heated and dried in the oven 3, the substrate 5 is sent to the infrared drying device 6 for infrared drying. Infrared drying is based on the thermal effect of infrared rays to heat and dry the target object. Infrared rays have a certain penetrating ability and can heat the coating located inside the coating (the side closer to the substrate 5) to achieve deep treatment of the solvent in the coating. At the same time, the first infrared drying device 6 and the second infrared drying device 6 are respectively set on opposite sides of the first roller 63, which can heat and dry the first side and the second side of the substrate 5 at the same time to ensure the consistency of heating and drying of the first side and the second side of the substrate 5.
[0052] In one embodiment, reference is made to Figure 1 The first infrared drying assembly 61 includes a plurality of first infrared dryers 611, which are arranged sequentially along the conveying direction of the substrate 5, and the temperature of the plurality of first infrared dryers 611 increases along the conveying direction of the substrate 5; and / or, the second infrared drying assembly 62 includes a plurality of second infrared dryers 621, which are arranged sequentially along the conveying direction of the substrate 5, and the temperature of the plurality of second infrared dryers 621 increases along the conveying direction of the substrate 5.
[0053] The first infrared drying assembly 61 can be configured as a plurality of first infrared dryers 611 spaced apart along the conveying direction of the substrate 5. The operating temperature of the first infrared dryers 611 increases along the conveying direction of the substrate 5, thereby achieving gradient heating and drying of the first side of the substrate 5 in the infrared drying device 6. Correspondingly, the second infrared drying assembly 62 can be configured as a plurality of second infrared dryers 621 spaced apart along the conveying direction of the substrate 5. The operating temperature of the second infrared dryers 621 increases along the conveying direction of the substrate 5, thereby achieving gradient heating and drying of the second side of the substrate 5 in the infrared drying device 6.
[0054] Gradient heating and drying allows the solvent to slowly migrate from the inside of the coating to the outside, ensuring a uniform reduction in solvent residue in the coating, reducing stress caused by uneven drying inside and outside the coating, ensuring the structural stability of the substrate 5 and the coating, and ensuring the quality of the electrode.
[0055] An infrared dryer is a component that emits infrared radiation, i.e., a radiant heat source. For example, an infrared dryer may include an infrared lamp, a metal heating element, a ceramic heater, etc.
[0056] In one embodiment, reference is made to Figure 1 The first infrared drying assembly 61 faces the first side of the substrate 5, and the second infrared drying assembly 62 faces the second side of the substrate 5. The first infrared drying assembly 61 includes a plurality of first infrared dryers 611, and the second infrared drying assembly 62 includes a plurality of second infrared dryers 621. The number of first infrared dryers 611 is less than the number of second infrared dryers 621.
[0057] The first infrared dryer 611 is configured to face the first side of the substrate 5 to reduce the dissipation of infrared radiation and maximize the drying effect of the first infrared dryer 611 on the first side of the substrate 5; similarly, the second infrared dryer 621 is configured to face the second side of the substrate 5 to reduce the dissipation of infrared radiation and maximize the drying effect of the second infrared dryer 621 on the second side of the substrate 5.
[0058] Since the first side of the substrate 5 is first coated in the first front coating machine 21 and then heated and dried in the first front coating machine 21, and the second side of the substrate 5 is subsequently heated and dried in the first rear oven 32, the second front oven 33, and the second rear oven 34, the heating time of the first side of the substrate 5 will be longer than that of the second side before entering the infrared drying device 6. Therefore, by setting the number of first infrared dryers 611 to be less than the number of second infrared dryers 621, the heating and drying time of the second side of the substrate 5 can be increased while the specifications of the first infrared dryers 611 and the second infrared dryers 621 are the same, thereby ensuring the consistency of the drying degree of the first side and the second side of the substrate 5.
[0059] In one embodiment, reference is made to Figure 1 The first infrared drying component 61 and the second infrared drying component 62 are arranged opposite to each other, and the first infrared drying component 61 is located below the second infrared drying component 62. The first infrared dryer 611 and the first roller 63 are arranged alternately at intervals.
[0060] The first infrared drying component 61 is located below the second infrared drying component 62, that is, the first infrared drying component 61 and the second infrared drying component 62 are arranged opposite each other so that the infrared radiation area of the first infrared drying component 61 and the infrared radiation area of the second infrared drying component 62 overlap. When the substrate 5 enters the working range of the first infrared drying component 61, it can be ensured that both sides of the substrate 5 are simultaneously heated and dried by infrared radiation, thereby reducing the temperature gradient between the first side and the second side of the substrate 5 and improving the consistency of drying on both sides of the substrate 5.
[0061] Furthermore, since the substrate 5 is supported and transported from below by the first conveying roller, and the number of first infrared dryers 611 in the first row of infrared drying assemblies is less than the number of second infrared dryers 621 in the second infrared drying assembly 62, placing the first infrared drying assembly 61 below the second infrared drying assembly 62 allows the first infrared dryers 611 and the first roller 63 to be arranged alternately, thus balancing the space utilization efficiency of the infrared drying device 6 with the heating and drying effect.
[0062] In one embodiment, reference is made to Figure 1Along the conveying direction of the substrate 5, the first infrared dryer 611 in the first infrared drying assembly 61 is located after the first second infrared dryer 621 in the second infrared drying assembly 62.
[0063] When the number of first infrared dryers 611 is less than the number of second infrared dryers 621, the first first infrared dryer 611 in the first infrared drying assembly 61 can be placed after the first second infrared dryer 621 in the second infrared drying assembly 62. This allows the second infrared drying assembly 62 to heat and dry the second side of the substrate 5 first. While the first side of the substrate 5 has been heated by the first front oven 31, the first rear oven 32, the first front oven 31, and the second rear oven 34, the consistency of the heating and drying effect of the first and second sides of the substrate 5 is ensured, and damage to the structure of the substrate 5 caused by uneven heating of the first and second sides is avoided.
[0064] In one embodiment, reference is made to Figure 1 The coating equipment is divided into upper and lower layers; the first front coating machine 21, the first front drying oven 31, the first rear coating machine 22 and the first rear drying oven 32 are arranged in sequence on the lower layer of the coating equipment; the second front coating machine 23, the second front drying oven 33, the second rear coating machine 24 and the second rear drying oven 34 are arranged in sequence on the upper layer of the coating equipment; the conveying direction of the substrate 5 on the upper layer of the coating equipment is opposite to the conveying direction of the substrate 5 on the lower layer of the coating equipment.
[0065] Because the coating machine 2 and the oven 3 are segmented in this invention, the length of each individual oven 3 is reduced compared to the length of the oven 3 in related technologies. This allows for layered arrangement of the coating equipment, reducing the footprint of the coating equipment and increasing the flexibility of its deployment. This arrangement also allows the winding machine 4 and the unwinding machine 1 to be placed on the same side of the coating equipment, facilitating the handling and unloading of the substrate 5.
[0066] In one embodiment, in conjunction with reference Figure 1 and Figure 5 The oven 3 includes a plurality of second rollers 35 and a plurality of drying nozzles 36; the second rollers 35 are used to convey the substrate 5, and the drying nozzles 36 are used to discharge hot air to the surface of the substrate 5 to dry the coating on the surface of the substrate 5; the second rollers 35 and the drying nozzles 36 are arranged alternately at intervals; the drying nozzles 36 face the interval between the second rollers 35.
[0067] Second rollers 35 are spaced apart inside the oven 3 along the conveying direction of the substrate 5. The substrate 5 moves inside the oven 3 via the second rollers 35. Drying nozzles 36 are provided on the side of the second rollers 35 facing the substrate 5. The drying nozzles 36 are used to discharge hot air to heat and dry the moving substrate 5. A corresponding blower 37 can be installed outside the oven 3 to supplement air. To avoid the influence of the second rollers 35 on the heating and drying effect of the drying nozzles 36, the second rollers 35 and the drying nozzles 36 are alternately spaced, with the drying nozzles 36 facing the gaps between the second rollers 35. The hot air from the drying nozzles 36 dries the coating applied by the coating machine 2 to remove solvents from the coating. The substrate 5 is heated and dried in the gaps between the second rollers 35. This avoids heating and drying the substrate 5 when the second rollers 35 are pressing against the contact surface of the substrate 5, thus preventing uneven stress on the coating on the substrate 5 and ensuring the structural stability of the electrode.
[0068] In one embodiment, the operating temperature gradient of each of the plurality of drying nozzles 36 increases along the conveying direction of the substrate 5.
[0069] The operating temperature of the drying nozzle 36 increases gradually along the conveying direction of the substrate 5, achieving gradient heating and drying of the side of the substrate 5 to be heated in the corresponding oven 3. Through gradient heating and drying, the solvent slowly migrates from the inside of the coating to the outside, ensuring that the residual solvent in the coating is reduced uniformly, reducing the stress caused by uneven drying inside and outside the coating, ensuring the structural stability of the substrate 5 and the coating, and guaranteeing the quality of the electrode.
[0070] In one embodiment, in conjunction with reference Figure 1 , Figure 2 and Figure 3 The coating equipment may also include multiple rollers 7, which are arranged sequentially along the conveying direction of the substrate 5, and the conveying line formed by the rollers 7 is used to convey the substrate 5.
[0071] The conveying direction of the substrate 5 can be determined by multiple guide rollers 7. By setting the guide rollers 7 at preset positions, the substrate 5 can be stretched, contracted, bent, and turned to adapt to different conveying route requirements. The support of the guide rollers 7 can prevent the substrate 5 from sagging during conveying and avoid wear. When the substrate 5 is tightened by the guide rollers 7, it can ensure that there is sufficient friction between the substrate 5 and the guide rollers 7 to prevent the substrate 5 from slipping or deviating, which could cause wear on the substrate 5 or failure of the coating equipment.
[0072] In one embodiment, the unwinder 1 and the rewinder 4 are located on the same side of the coating equipment, and the unwinder 1 and the rewinder 4 are located on the lower layer of the coating equipment; this facilitates the handling and unloading of the substrate 5.
[0073] In summary, the coating equipment provided in this embodiment includes an unwinding machine, a coating machine, an oven, and a rewinding machine. The substrate to be coated is released by the unwinding machine, coated by the coating machine, dried in the oven, and finally collected by the rewinding machine. The coating machine is sequentially divided into a first front coating machine, a first rear coating machine, a second front coating machine, and a second rear coating machine along the substrate conveying direction, and correspondingly equipped with a first front oven, a first rear oven, a second front oven, and a second rear oven. The substrate first enters the first front coating machine to coat a portion of the coating on its first side, and then enters the first front oven to further coat the substrate. The coating applied in the middle is dried to form at least a partial coating on the first side of the substrate. After that, the substrate enters a second pre-coating machine, where the coating is applied again to the first side of the substrate that has already been coated. Then, the substrate enters a first post-drying oven to dry the newly applied coating on the first side of the substrate, thereby forming a complete coating on the first side of the substrate. After that, the substrate sequentially enters a second pre-coating machine, a second pre-drying oven, a second post-coating machine, and a second post-drying oven. Through the same coating and drying method as the first side of the substrate, a complete coating is formed on the second side of the substrate. At this point, the coating operations on both the first and second sides of the substrate are completed, and the substrate is handed over to a winding machine for collection. In this embodiment of the invention, for each side of the substrate, an independent front coating machine, a front drying oven, a rear coating machine, and a rear drying oven are respectively set up, realizing the decomposition and segmentation of the coating operation. The front coating machine and the front drying oven prepare the coating part close to the substrate, and the rear coating machine and the rear drying oven prepare the coating part far away from the substrate. The coating operation and the corresponding drying operation are performed in segments. On the one hand, during the coating preparation, the substrate can be cooled between multiple ovens to avoid heat accumulation and thus avoid damage to the substrate structure. On the other hand, segmented coating and drying reduce the size requirements of the ovens, improve the adaptability of the coating machine and ovens to the site space, reduce the footprint of the coating equipment, and enhance the flexibility of the coating equipment deployment.
[0074] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.
[0075] The present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A coating apparatus characterized by comprising: The coating equipment includes: Unwinder (1), used to release substrate (5); The coating machine (2) includes a first front coating machine (21), a first rear coating machine (22), a second front coating machine (23), and a second rear coating machine (24) arranged sequentially along the conveying direction of the substrate (5); the first front coating machine (21) and the first rear coating machine (22) are used to coat the first side of the substrate (5) with coating material, and the second front coating machine (23) and the second rear coating machine (24) are used to coat the second side of the substrate (5) with coating material; The oven (3) includes a first front oven (31), a first rear oven (32), a second front oven (33), and a second rear oven (34) arranged sequentially along the conveying direction of the substrate (5); the first front oven (31) is located between the first front coating machine (21) and the first rear coating machine (22), the first rear oven (32) is located between the second front coating machine (23) and the second rear coating machine (24), the second front oven (33) is located between the second front coating machine (23) and the second rear coating machine (24), and the second rear oven (34) is located on the side of the second rear coating machine (24) away from the second front oven (33); A winding machine (4) is used to collect the substrate (5) after the coating operation has been completed.
2. The coating equipment according to claim 1, characterized in that, Along the conveying direction of the substrate (5), the winding machine (4) is located at the end of the conveying direction of the substrate (5), and an infrared drying device (6) is also provided between the second rear oven (34) and the winding machine (4); The infrared drying device (6) includes a first infrared drying component (61), a second infrared drying component (62), and a first roller (63); a plurality of first rollers (63) are arranged sequentially along the conveying direction of the substrate (5) for conveying the substrate (5), and the first infrared drying component (61) and the second infrared drying component (62) are arranged on opposite sides of the first roller (63).
3. The coating equipment according to claim 2, characterized in that, The first infrared drying assembly (61) includes a plurality of first infrared dryers (611), which are arranged sequentially along the conveying direction of the substrate (5), and the temperature of the plurality of first infrared dryers (611) increases along the conveying direction of the substrate (5). And / or, the second infrared drying assembly (62) includes a plurality of second infrared dryers (621), which are arranged sequentially along the conveying direction of the substrate (5), and the temperature of the plurality of second infrared dryers (621) increases along the conveying direction of the substrate (5).
4. The coating equipment according to claim 2, characterized in that, The first infrared drying assembly (61) faces the first side of the substrate (5), and the second infrared drying assembly (62) faces the second side of the substrate (5); The first infrared drying assembly (61) includes a plurality of first infrared dryers (611), and the second infrared drying assembly (62) includes a plurality of second infrared dryers (621), wherein the number of first infrared dryers (611) is less than the number of second infrared dryers (621).
5. The coating equipment according to claim 4, characterized in that, The first infrared drying component (61) is arranged opposite to the second infrared drying component (62), and the first infrared drying component (61) is located below the second infrared drying component (62). The first infrared dryer (611) and the first roller (63) are arranged alternately at intervals.
6. The coating equipment according to claim 4, characterized in that, Along the conveying direction of the substrate (5), the first first infrared dryer (611) in the first infrared drying assembly (61) is located after the first second infrared dryer (621) in the second infrared drying assembly (62).
7. The coating equipment according to claim 1, characterized in that, The coating equipment consists of two layers: upper and lower. The first front coating machine (21), the first front drying oven (31), the first rear coating machine (22) and the first rear drying oven (32) are sequentially arranged in the lower layer of the coating equipment; the second front coating machine (23), the second front drying oven (33), the second rear coating machine (24) and the second rear drying oven (34) are sequentially arranged in the upper layer of the coating equipment; The conveying direction of the substrate (5) in the upper layer of the coating equipment is opposite to the conveying direction of the substrate (5) in the lower layer of the coating equipment.
8. The coating equipment according to claim 1, characterized in that, The oven (3) includes a plurality of second rollers (35) and a plurality of drying nozzles (36); the second rollers (35) are used to convey the substrate (5), and the drying nozzles (36) are used to discharge hot air to the surface of the substrate (5) to dry the coating on the surface of the substrate (5); the second rollers (35) and the drying nozzles (36) are alternately spaced; the drying nozzles (36) face the gap between the second rollers (35).
9. The coating equipment according to claim 8, characterized in that, Along the conveying direction of the substrate (5), the operating temperature gradient of each of the plurality of drying nozzles (36) increases.
10. The coating equipment according to claim 7, characterized in that, The coating equipment also includes multiple guide rollers (7), which are arranged sequentially along the conveying direction of the substrate (5). The conveying line formed by the guide rollers (7) is used to convey the substrate (5). The unwinding machine (1) and the winding machine (4) are located on the same side of the coating equipment, and the unwinding machine (1) and the winding machine (4) are located in the lower layer of the coating equipment.