Fold-back coating oven

Abstract

This application relates to a folding coating oven. The folding coating oven includes a hull unit, a roller assembly, a coating unit, and a heating unit. A first conveyor belt channel is formed between a first hull and a second hull. The first conveyor belt channel is divided by a first partition to form a first drying channel and a second drying channel. The second conveyor belt channel is divided by a second partition to form a third drying channel and a fourth drying channel. The roller assembly is used to drive the electrode sheet sequentially through the first drying channel, the second drying channel, the third drying channel, and the fourth drying channel. The coating unit is used to coat both sides of the electrode sheet. The heating unit includes a first dryer and a second dryer. The air outlets of at least two first dryers are respectively connected to the first drying channel and the third drying channel. The air outlets of at least two second dryers are respectively connected to the second drying channel and the fourth drying channel. The solution provided by this application can achieve a consistent outlet air temperature.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a folding coating oven. Background Technology

[0002] In related technologies, traditional ovens often require multiple layers or multiple transfers to dry both sides of the electrode sheets during double-sided baking, resulting in low space utilization and a large oven length. This leaves room for optimization in terms of factory layout compactness and ease of maintenance. In addition, the oven's heating and temperature control methods lack independent zoning design for the wet film drying channel, which can easily lead to insufficient temperature uniformity in different areas and affect the consistency of electrode drying. Utility Model Content

[0003] To address or partially address the problems existing in related technologies, this application provides a folding coating oven that can achieve consistent outlet air temperature and improve the consistency of drying of wet and dry films on electrode sheets.

[0004] This application provides a reversible coating oven, comprising a hull unit, a roller assembly, a coating unit, and a heating unit. The hull unit includes a first hull, a second hull, a third hull, a fourth hull, a first partition, and a second partition. The first hull and the second hull are arranged facing each other, forming a first conveyor belt channel. The first conveyor belt channel is divided by the first partition to form a first drying channel and a second drying channel. The third hull and the second hull are arranged opposite to each other, and the third hull and the fourth hull are arranged facing each other, forming a second conveyor belt channel. The second conveyor belt channel passes through... The second partition separates and forms a third drying channel and a fourth drying channel; the roller assembly is used to drive the electrode sheet to pass through the first drying channel, the second drying channel, the third drying channel, and the fourth drying channel in sequence; the coating unit is used to coat the opposite sides of the electrode sheet; the heating unit includes a first dryer and a second dryer; the air inlet of the first dryer is used to introduce fresh air, and at least two air outlets of the first dryer are respectively connected to the first drying channel and the third drying channel; the air inlet of the second dryer is used to introduce fresh air, and at least two air outlets of the second dryer are respectively connected to the second drying channel and the fourth drying channel.

[0005] Furthermore, a second drying channel is formed between the first hull and the first bulkhead, and a first drying channel is formed between the second hull and the first bulkhead; a third drying channel is formed between the third hull and the second bulkhead, and a fourth drying channel is formed between the fourth hull and the second bulkhead.

[0006] Furthermore, at least two return air vents of the first dryer are respectively connected to the first drying channel and the third drying channel; at least two return air vents of the second dryer are respectively connected to the second drying channel and the fourth drying channel.

[0007] Furthermore, in any of the first drying channel, the second drying channel, the third drying channel, or the fourth drying channel, the return air inlet of the first dryer is in the forward direction of the air outlet of the first dryer along the electrode tape direction, and the return air inlet of the second dryer is in the forward direction of the air outlet of the second dryer along the electrode tape direction.

[0008] Furthermore, the coating unit includes a first coating machine for coating the electrode sheet, and the roller assembly includes a suspension roller located between the first coating machine and the third drying channel.

[0009] Furthermore, a second drying channel is formed between the first hull and the first bulkhead, and a first drying channel is formed between the second hull and the first bulkhead; a fourth drying channel is formed between the third hull and the second bulkhead, and a third drying channel is formed between the fourth hull and the second bulkhead.

[0010] Furthermore, at least three return air vents of the first dryer are respectively connected to the first drying channel, the third drying channel, and the fourth drying channel; at least three return air vents of the second dryer are respectively connected to the first drying channel, the second drying channel, and the fourth drying channel.

[0011] Furthermore, the folding coating oven also includes a turning mechanism, and the coating unit includes a second coating machine for coating the electrode sheet. The turning mechanism is located between the second coating machine and the second drying channel.

[0012] Furthermore, the flipping mechanism and the coating unit are located on the same side of the hull unit.

[0013] Furthermore, the first hull, the second hull, the third hull, and the fourth hull are arranged sequentially from bottom to top.

[0014] The technical solution provided in this application may include the following beneficial results: by connecting the air outlet of the first dryer to the first drying channel and the third drying channel respectively, and connecting the air outlet of the second dryer to the second drying channel and the fourth drying channel respectively, the first drying channel and the third drying channel are supplied with hot air by the same first dryer, the first dryer dries the electrode wet film, and the second drying channel and the fourth drying channel are supplied with hot air by the same second dryer, the second dryer dries the electrode dry film, ensuring that the air outlet temperature is consistent when drying the electrode wet film or dry film, improving the drying consistency of the electrode wet film and dry film, and realizing the high efficiency, precision and energy saving of the electrode coating drying process.

[0015] 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

[0016] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0017] Figure 1 This is a schematic diagram of the structure of the folding coating oven shown in the embodiments of this application; Figure 2 This is a schematic diagram of the heating unit shown in an embodiment of this application; Figure 3 This is another structural schematic diagram of the folding coating oven shown in the embodiments of this application; Figure 4 This is another structural schematic diagram of the heating unit shown in the embodiment of this application.

[0018] Reference numerals: Hull unit 1; First hull 11; Second hull 12; Third hull 13; Fourth hull 14; First bulkhead 15; Second bulkhead 16; First conveyor belt channel 17; First drying channel 171; Second drying channel 172; Second conveyor belt channel 18; Third drying channel 181; Fourth drying channel 182; Roller assembly 2; Suspension roller 21; Coating unit 3; A-side coating machine 31; First coating machine 32; Second coating machine 33; Heating unit 4; First dryer 41; First air inlet 411; First outlet Air outlet 412; second air outlet 413; first heating element 414; first circulating fan 415; first return air outlet 416; first exhaust outlet 417; fourth return air outlet 418; second dryer 42; second air inlet 421; third air outlet 422; fourth air outlet 423; second heating element 424; second circulating fan 425; second return air outlet 426; third return air outlet 427; second exhaust outlet 428; third exhaust outlet 43; fourth exhaust outlet 44; unwinding mechanism 5; winding mechanism 6; flipping mechanism 7; electrode sheet 8. Detailed Implementation

[0019] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0020] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0022] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In related technologies, traditional ovens often require multiple layers or transfers to dry both sides of the electrode sheets during double-sided baking, resulting in low space utilization and a large oven length. This leaves room for optimization in terms of factory layout compactness and ease of maintenance. Furthermore, the oven's heating and temperature control methods lack independent zoning design for the wet film drying channel, easily leading to insufficient temperature uniformity in different areas and affecting the consistency of electrode drying. To address these issues, this application provides a folding coating oven that can achieve consistent outlet air temperature, improving the consistency of wet and dry film drying.

[0024] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0025] See Figure 1 and Figure 2 The folding coating oven includes a hull unit 1, a roller assembly 2, a coating unit 3, and a heating unit 4. The hull unit 1 includes a first hull 11, a second hull 12, a third hull 13, a fourth hull 14, a first partition 15, and a second partition 16. The first hull 11 and the second hull 12 are arranged facing each other, forming a first conveyor channel 17. The first conveyor channel 17 is divided by the first partition 15 into a first drying channel 171 and a second drying channel 172, wherein the extending direction of the first drying channel 171 is parallel to the extending direction of the second drying channel 172. The electrode 8 can be driven within the first drying channel 171, then folded back by the roller assembly 2, and then driven within the second drying channel 172.

[0026] See Figure 1 and Figure 2The third hull 13 is connected to the second hull 12, and the third hull 13 and the second hull 12 are arranged back-to-back. The third hull 13 and the fourth hull 14 are arranged facing each other, forming a second conveyor channel 18. The second conveyor channel 18 is divided by a second partition 16 to form a third drying channel 181 and a fourth drying channel 182, wherein the extending direction of the third drying channel 181 is parallel to the extending direction of the fourth drying channel 182. The electrode 8 can be driven in the third drying channel 181, then folded back by the roller assembly 2, and then driven in the fourth drying channel 182. The roller assembly 2 is used to drive the electrode 8 to pass through the first drying channel 171, the second drying channel 172, the third drying channel 181, and the fourth drying channel 182 in sequence. The coating unit 3 can coat the opposite sides of the electrode 8 with slurry. The roller assembly 2 includes multiple active rollers, which are distributed in the first drying channel 171, the second drying channel 172, the third drying channel 181, and the fourth drying channel 182. The active rollers can drive the electrode 8 to move within the first drying channel 171, the second drying channel 172, the third drying channel 181, and the fourth drying channel 182, thereby reducing the wrinkling and misalignment of the electrode 8.

[0027] See Figure 1 and Figure 2The heating unit 4 includes a first dryer 41 and a second dryer 42. The air inlet of the first dryer 41 is designated as the first air inlet 411, which is used to introduce fresh air, which can be gas from the atmosphere. At least two air outlets of the first dryer 41 are connected to the first drying channel 171 and the third drying channel 181, respectively. The air outlets of the first dryer 41 include a first air outlet 412 and a second air outlet 413. Gas from the atmosphere enters the first dryer 41 through the first air inlet 411 and is then heated by the first dryer 41 to form hot air. The first dryer 41 then supplies hot air to the first drying channel 171 through the first air outlet 412, and further supplies hot air to the third drying channel 181 through the second air outlet 413. The air inlet of the second dryer 42 is designated as the second air inlet 421. The second air inlet 421 is used to introduce fresh air, which can be gas from the atmospheric environment or an inert gas. At least two air outlets of the second dryer 42 are connected to the second drying channel 172 and the fourth drying channel 182, respectively. The air outlets of the second dryer 42 include the third air outlet 422 and the fourth air outlet 423. The first air inlet 411 and the second air inlet 421 are independent of each other. Gas from the atmospheric environment enters the second dryer 42 through the second air inlet 421 and is then heated by the second dryer 42 to form hot air. The second dryer 42 then supplies hot air to the second drying channel 172 and the fourth drying channel 182, respectively. The first dryer 41 includes a first heating element 414 and a first circulating fan 415. The first circulating fan 415 is connected to the first air inlet 411 through a pipe. The first heating element 414 is connected to the first air outlet 412 and the second air outlet 413 through pipes. The first circulating fan 415 is connected to the first heating element 414. The first circulating fan 415 delivers gas to the first heating element 414. After the gas is heated by the first heating element 414, it is then transported to the first air outlet 412 and the second air outlet 413 through pipes. The second dryer 42 includes a second heating element 424 and a second circulating fan 425. The second circulating fan 425 is connected to the second air inlet 421 through a pipe. The second heating element 424 is connected to the third air outlet 422 and the fourth air outlet 423 through pipes. The second circulating fan 425 is connected to the second heating element 424 and supplies gas to the second heating element 424. The gas is heated by the second heating element 424 and then transported to the third air outlet 422 and the fourth air outlet 423 through pipes. The heating method of the first heating element 414 and the second heating element can be electric heating, oil heating, or steam heating. The first dryer 41 mainly dries the wet surface of the electrode 8. The second dryer 42 mainly further dries the dry film of the electrode 8.

[0028] See Figure 1 and Figure 2In actual operation, the folding coating oven also includes an unwinding mechanism 5 and a winding mechanism 6. The unwinding mechanism 5 outputs the electrode sheet 8. Before the electrode sheet 8 enters the first drying channel 171, the coating unit 3 first coats one side of the electrode sheet 8 with slurry. After the electrode sheet 8 enters the first drying channel 171, the first dryer 41 dries the electrode sheet 8 in the first drying channel 171. After the electrode sheet 8 comes out of the first drying channel 171, it is folded back by the roller assembly 2 and then enters the second drying channel 172. The second dryer 42 dries the electrode sheet 8 in the second drying channel 172. The electrode sheet 8 is dried. After the electrode sheet 8 comes out of the second drying channel 172, the coating unit 3 coats the other side of the electrode sheet 8 with slurry. Then the electrode sheet 8 enters the third drying channel 181. The first dryer 41 dries the electrode sheet 8 in the third drying channel 181. After the electrode sheet 8 comes out of the third drying channel 181, it is folded back by the roller assembly 2 and then enters the fourth drying channel 182. The second dryer 42 dries the electrode sheet 8 in the fourth drying channel 182. After both sides of the electrode sheet 8 are dried, the winding mechanism 6 finally winds up the electrode sheet 8.

[0029] This application connects the air outlet of the first dryer 41 to the first drying channel 171 and the third drying channel 181, respectively, and connects the air outlet of the second dryer 42 to the second drying channel 172 and the fourth drying channel 182, respectively. The first drying channel 171 and the third drying channel 181 are supplied with hot air by the same first dryer 41, which dries the wet film of the electrode 8. The second drying channel 172 and the fourth drying channel 182 are supplied with hot air by the same second dryer 42, which dries the dry film of the electrode 8. This ensures that the air outlet temperature is consistent when drying the wet or dry film of the electrode 8, improves the drying consistency of the wet and dry films of the electrode 8, and achieves high efficiency, precision, and energy saving in the electrode 8 coating and drying process.

[0030] See Figure 1 and Figure 2In some embodiments, a second drying channel 172 is formed between the first hull 11 and the first bulkhead 15, and a first drying channel 171 is formed between the second hull 12 and the first bulkhead 15; a third drying channel 181 is formed between the third hull 13 and the second bulkhead 16, and a fourth drying channel 182 is formed between the fourth hull 14 and the second bulkhead 16; wherein the air outlets of the first dryer 41 can be respectively disposed on the second hull 12 and the third hull 13, and respectively facing the first drying channel 171 and the third drying channel 181. Specifically, the first air outlet 412 can be disposed on the second hull 12, and the second air outlet 413 can be disposed on the third hull 13; the air outlets of the second dryer 42 can be respectively disposed on the first hull 11 and the fourth hull 14, and respectively facing the second drying channel. Specifically, the third air outlet 422 can be located on the first hull 11, and the fourth air outlet 423 can be located on the fourth hull 14. The first dryer 41 can also extend directly into the first drying channel 171 through a pipe and have the first air outlet 412 located in the first drying channel 171. The first dryer 41 can also extend directly into the third drying channel 181 through a pipe and have the second air outlet 413 located in the third drying channel 181. The second dryer 42 can also extend directly into the second drying channel 172 through a pipe and have the third air outlet 422 located in the second drying channel 172. The second dryer 42 can also extend directly into the fourth drying channel 182 through a pipe and have the fourth air outlet 423 located in the fourth drying channel 182.

[0031] See Figure 1 and Figure 2At least two return air vents of the first dryer 41 are respectively connected to the first drying channel 171 and the third drying channel 181. The return air vents of the first dryer 41 include at least two first return air inlets 416. The first circulating fan 415 is connected to the first return air inlets 416 via a pipe. After the first dryer 41 supplies hot air to the first drying channel 171, the hot air heats the electrode plates 8 in the first drying channel 171. Part of the hot air can flow back into the first dryer 41 from the first return air inlets 416 in the first drying channel 171. After the first dryer 41 supplies hot air to the third drying channel 181, the hot air heats the electrode plates 8 in the third drying channel 181. The electrode 8 in the drying channel 181 is heated, and part of the hot air can flow back into the first dryer 41 from the first return air port 416 in the third drying channel 181. The hot air flowing back into the first dryer 41 from the first return air port 416 is heated by the first dryer 41 and then sent back to the first drying channel 171 and the third drying channel 181. The hot air output from the first dryer 41 is recovered through the first return air port 416, thereby reducing energy consumption. In addition, part of the hot air can be sent to the first exhaust port 417 of the first dryer 41 through the first return air port 416, and discharged outside the folding coating oven from the first exhaust port 417. Specifically, at least two first return air ports 416 can be respectively set on the second hull 12 and the third hull 13.

[0032] See Figure 1 and Figure 2 At least two return air vents of the second dryer 42 are respectively connected to the second drying channel 172 and the fourth drying channel 182. The return air vents of the second dryer 42 include a second return air vent 426 and a third return air vent 427. The second circulating fan 425 is connected to the return air vents of the second dryer 42 via a pipe. Specifically, the second return air vent 426 can be located on the first hull 11, and the third return air vent 427 can be located on the fourth hull 14. After the second dryer 42 supplies hot air to the second drying channel 172, the hot air heats the electrode plates 8 in the second drying channel 172. Part of the hot air can flow back into the second dryer 42 from the second return air vent 426 in the second drying channel 172. The second dryer 42 then flows to the fourth drying channel... After hot air is delivered to the fourth drying channel 182, the hot air heats the electrode 8 in the fourth drying channel 182. Some of the hot air can flow back into the second dryer 42 from the third return air port 427 in the fourth drying channel 182. The hot air flowing back into the second dryer 42 from the second return air port 426 and the third return air port 427 is heated by the second dryer 42 and then delivered back to the second drying channel 172 and the fourth drying channel 182. The hot air output from the second dryer 42 is recovered through the second return air port 426 and the third return air port 427, thereby reducing energy consumption. In addition, some of the hot air can be sent to the second exhaust port 428 of the second dryer 42 through the second return air port 426 and the third return air port 427, and discharged outside the folding coating oven from the second exhaust port 428.

[0033] See Figure 1 and Figure 2 Specifically, the first exhaust port 417 and the second exhaust port 428 are independent of each other. The exhaust gas in the high-temperature wet film zone contains high concentrations of solvents (such as NMP and toluene-based organic solvents), which can be recycled through the independent first exhaust port 417. The exhaust gas in the low-temperature dry film zone has a low solvent concentration, which can be combined and fed into the second exhaust port 428 for treatment. Compared with the traditional single large exhaust system, this can improve the solvent recovery efficiency and reduce the end-of-pipe treatment load.

[0034] See Figure 1 and Figure 2 Preferably, in any of the first drying channel 171, second drying channel 172, third drying channel 181, or fourth drying channel 182, the return air inlet of the first dryer 41 is in the same direction as the air outlet of the first dryer 41 along the forward direction of the electrode 8, that is, the direction of the electrode 8 is the same as the direction in which hot air flows from the air outlet of the first dryer 41 to the return air inlet of the first dryer 41. The return air inlet of the second dryer 42 is in the same direction as the air outlet of the second dryer 42 along the forward direction of the electrode 8, that is, the direction in which the electrode 8 is the same as the direction in which hot air flows from the air outlet of the second dryer 42 to the return air inlet of the second dryer 42. This avoids the hot air affecting the belt speed of the electrode 8, making the electrode 8 move more smoothly during transmission.

[0035] See Figure 1 and Figure 2The electrode 8 is divided into two sides, A and B, by a coating unit 3, which includes an A-side coating machine 31 and a first coating machine 32. The A-side coating machine 31 coats the electrode 8 with slurry, and the first coating machine 32 coats the electrode 8 with slurry on the B side. The roller assembly 2 includes a suspension roller 21, which is located between the first coating machine 32 and the third drying channel 181. In actual operation, after the unwinding mechanism 5 outputs the electrode 8, the A-side coating machine 31 coats the electrode 8 with slurry on the A side. The electrode 8 then enters the first drying channel 171, where the first dryer 41 outputs hot air to dry the A side of the electrode 8. After leaving the first drying channel 171, the electrode 8 passes through the roller assembly 2 and returns to the second drying channel 172. The second dryer 42 then outputs hot air from the second drying channel 172. The electrode 8 is dried on side A in the second drying channel 172. After leaving the second drying channel 172, the electrode 8 is coated with slurry on side B by the first coating machine 32. Then, guided by the suspension roller 21, the electrode 8 enters the third drying channel 181, where the first dryer 41 dries side B. After leaving the third drying channel 181, the electrode 8 passes through the roller assembly 2 and returns to the fourth drying channel 182, where the second dryer 42 dries side B again. After leaving the fourth drying channel 182, the electrode 8 is wound up by the winding mechanism 6. The suspension roller 21 guides the electrode 8 while avoiding contact with it, preventing the slurry on the electrode 8 from adhering to the suspension roller 21, thus ensuring the production quality of the electrode 8. The suspension roller 21 can be one or more combinations of non-contact rollers such as air-floating rollers and magnetic levitation rollers. Each of the first drying channel 171, the second drying channel 172, the third drying channel 181, and the fourth drying channel 182 is equipped with an electric air valve. The opening and closing of the electric air valves in real time by the PLC system can adjust the mixing ratio of fresh air and return air and precisely control the temperature of each zone.

[0036] See Figure 3 and Figure 4In some embodiments, a second drying channel 172 is formed between the first hull 11 and the first bulkhead 15, and a first drying channel 171 is formed between the second hull 12 and the first bulkhead 15; a fourth drying channel 182 is formed between the third hull 13 and the second bulkhead 16, and a third drying channel 181 is formed between the fourth hull 14 and the second bulkhead 16; wherein the air outlet of the first dryer 41 can be respectively disposed on the second hull 12 and the fourth hull 14, and respectively facing the first drying channel 171 and the third drying channel 181. Specifically, the first air outlet 412 is disposed on the second hull 12, and the second... Air outlet 413 is located on the fourth hull 14; the air outlets of the second dryer 42 can be located on the first hull 11 and the third hull 13 respectively, and face the second drying channel 172 and the fourth drying channel 182 respectively. Specifically, the third air outlet 422 is located on the first hull 11, and the fourth air outlet 423 is located on the third hull 13; the air outlet of the first dryer 41 can also extend directly into the first drying channel 171 and the third drying channel 181 through a pipe, and the air outlet of the second dryer 42 can also extend directly into the second drying channel 172 and the fourth drying channel 182 through a pipe.

[0037] See Figure 3 and Figure 4 The return air vents of the first dryer 41 are connected to the first drying channel 171, the third drying channel 181, and the fourth drying channel 182, respectively. The return air vents of the first dryer 41 include at least two first return air vents 416 and one fourth return air vent 418. Specifically, at least two first return air vents 416 are respectively located on the third hull 12 and the third hull 13, and the fourth return air vent 418 is located on the fourth hull 14. After the first dryer 41 supplies hot air to the first drying channel 171, the hot air heats the electrode plates 8 in the first drying channel 171. Some of the hot air can flow back into the first dryer 41 from the first return air vents 416 in the first drying channel 171. The first dryer 41 supplies hot air to the third drying channel 181. After the initial heating, the hot air heats the electrode 8 in the third drying channel 181. Part of the hot air can flow back into the second dryer 42 through the fourth return air vent 418 in the third drying channel 181. After the second dryer 42 supplies hot air to the fourth drying channel 182, the hot air heats the electrode 8 in the fourth drying channel 182. Part of the hot air can flow back into the first dryer 41 through the first return air vent 416 in the fourth drying channel 182. The hot air flowing back into the first dryer 41 through the return air vent is heated by the first dryer 41 and then supplied back to the first drying channel 171 and the third drying channel 181. The hot air output from the first dryer 41 is recovered through the return air vent of the first dryer 41, thereby reducing energy consumption. Furthermore, part of the hot air can be sent to the third exhaust vent 43 through the first return air vent 416; the third exhaust vent 43 discharges the hot air outside the folding coating oven.

[0038] See Figure 3 and Figure 4 At least three return air vents of the second dryer 42 are respectively connected to the first drying channel 171, the second drying channel 172, and the fourth drying channel 182. The return air vents of the second dryer 42 include a second return air vent 426. The second dryer 42 and the first dryer 41 share a return air vent in the first drying channel 171 and the fourth drying channel 182. After the second dryer 42 supplies hot air to the second drying channel 172, the hot air heats the electrode plates 8 in the second drying channel 172. Some of the hot air can flow back into the second dryer 42 from the second return air vent 426 in the second drying channel 172. After the second dryer 42 supplies hot air to the fourth drying channel 182, the hot air heats the electrode plates 8 in the fourth drying channel 182. Some of the hot air can flow back into the second dryer 42 from the first return air vent 416 in the fourth drying channel 182. The hot air is returned to the second dryer 42. After the first dryer 41 supplies hot air to the first drying channel 171, the hot air heats the electrode 8 in the first drying channel 171. Some of the hot air can flow back to the second dryer 42 from the first return air port 416 in the first drying channel 171. The hot air flowing back to the second dryer 42 from the return air port of the second dryer 42 is heated by the first dryer 41 and then supplied to the second drying channel 172 and the fourth drying channel 182. The hot air output by the second dryer 42 is recovered through the return air port of the second dryer 42, thereby reducing energy consumption. In addition, some of the hot air can be sent to the fourth exhaust port 44 through the second return air port 426, and some of the hot air can be sent to the fourth exhaust port 44 through the fourth return air port 418, and discharged to the outside of the folding coating oven from the fourth exhaust port 44.

[0039] See Figure 3 and Figure 4The electrode 8 is divided into two sides, A and B, by a coating unit 3, which includes an A-side coating machine 31 and a second coating machine 33. The A-side coating machine 31 coats the electrode 8 with slurry, and the second coating machine 33 coats the electrode 8 with slurry on the B side. The folding coating oven also includes a turning mechanism 7. The coating unit 3 includes a second coating machine 33, which is used to coat the electrode 8. The turning mechanism 7 is located between the second coating machine 33 and the second drying channel 172. In actual operation, after the unwinding mechanism 5 outputs the electrode 8, the A-side coating machine 31 coats the electrode 8 with slurry on the A side. The electrode 8 then enters the first drying channel 171, where the first dryer 41 outputs hot air to dry the A side of the electrode 8 within the first drying channel 171. After leaving the first drying channel 171, electrode 8 is folded back to the second drying channel 172 by the roller assembly 2. The second dryer 42 outputs hot air from the second drying channel 172 to dry the A side of electrode 8 in the second drying channel 172. After leaving the second drying channel 172, electrode 8 is flipped over by the flipping mechanism 7. The second coating machine 33 then coats the B side of electrode 8 with slurry. Then, guided by the roller assembly 2, electrode 8 enters the third drying channel 181, where the B side of electrode 8 is dried by the first dryer 41. After leaving the third drying channel 181, electrode 8 is folded back to the fourth drying channel 182 by the roller assembly 2. The B side of electrode 8 is dried again by the second dryer 42. After leaving the fourth drying channel 182, electrode 8 is wound up by the winding mechanism 6.

[0040] See Figure 1 and Figure 2 In some embodiments, the flipping mechanism 7 and the coating unit 3 are located on the same side of the hull unit 1, which is conducive to centralized material supply and cleanroom design, thereby reducing the footprint of the entire folding coating oven, making the flipping mechanism 7 and the coating unit 3 more compact, and facilitating the miniaturization of the folding coating oven.

[0041] See Figure 1 and Figure 2 In some embodiments, the first hull 11, the second hull 12, the third hull 13, and the fourth hull 14 are arranged sequentially from bottom to top, the first partition 15 and the second partition 16 extend horizontally, and the first drying channel 171, the second drying channel 172, the third drying channel 181, and the fourth drying channel 182 extend horizontally, thereby making full use of the longitudinal space of the folding coating oven, improving the space utilization rate of the folding coating oven, and reducing the length of the folding coating oven.

[0042] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0043] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A folding coating oven, characterized in that, include: The hull unit includes a first hull, a second hull, a third hull, a fourth hull, a first bulkhead, and a second bulkhead; The first hull and the second hull are arranged facing each other, and a first conveyor belt channel is formed between the first hull and the second hull. The first conveyor belt channel is divided by the first partition to form a first drying channel and a second drying channel. The third hull and the second hull are arranged opposite to each other, and the third hull and the fourth hull are arranged facing each other. A second conveyor belt channel is formed between the third hull and the fourth hull. The second conveyor belt channel is divided by the second partition to form a third drying channel and a fourth drying channel. A roller conveyor assembly is used to drive the electrode sheet to pass sequentially through the first drying channel, the second drying channel, the third drying channel, and the fourth drying channel; A coating unit, wherein the coating unit is used to coat two opposing sides of the electrode sheet; The heating unit includes a first dryer and a second dryer; the air inlet of the first dryer is used to introduce fresh air, and at least two air outlets of the first dryer are respectively connected to the first drying channel and the third drying channel; the air inlet of the second dryer is used to introduce fresh air, and at least two air outlets of the second dryer are respectively connected to the second drying channel and the fourth drying channel.

2. The folding coating oven according to claim 1, characterized in that: A second drying channel is formed between the first hull and the first bulkhead, and a first drying channel is formed between the second hull and the first bulkhead; The third drying channel is formed between the third hull and the second bulkhead, and the fourth drying channel is formed between the fourth hull and the second bulkhead.

3. The folding coating oven according to claim 2, characterized in that: At least two return air vents of the first dryer are respectively connected to the first drying channel and the third drying channel; at least two return air vents of the second dryer are respectively connected to the second drying channel and the fourth drying channel.

4. The folding coating oven according to claim 3, characterized in that: In any of the first drying channel, the second drying channel, the third drying channel, or the fourth drying channel, the return air inlet of the first dryer is in the forward direction of the first dryer's air outlet along the electrode tape direction, and the return air inlet of the second dryer is in the forward direction of the second dryer's air outlet along the electrode tape direction.

5. The folding coating oven according to claim 2, characterized in that: The coating unit includes a first coating machine for coating electrode sheets, and the roller assembly includes a suspension roller located between the first coating machine and the third drying channel.

6. The folding coating oven according to claim 1, characterized in that: A second drying channel is formed between the first hull and the first bulkhead, and a first drying channel is formed between the second hull and the first bulkhead; The fourth drying channel is formed between the third hull and the second bulkhead, and the third drying channel is formed between the fourth hull and the second bulkhead.

7. The folding coating oven according to claim 6, characterized in that: At least three return air vents of the first dryer are respectively connected to the first drying channel, the third drying channel and the fourth drying channel; at least three return air vents of the second dryer are respectively connected to the first drying channel, the second drying channel and the fourth drying channel.

8. The folding coating oven according to claim 7, characterized in that: It also includes a flipping mechanism. The coating unit includes a second coating machine for coating the electrode sheet. The flipping mechanism is located between the second coating machine and the second drying channel.

9. The folding coating oven according to claim 8, characterized in that: The flipping mechanism and the coating unit are located on the same side of the hull unit.

10. The folding coating oven according to claim 1, characterized in that: The first hull, the second hull, the third hull, and the fourth hull are arranged sequentially from bottom to top.

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