Wide infrared oven

Abstract

The wide infrared oven comprises a drying cavity, two air blowing ship bodies, an air suction ship body, a plurality of air nozzles and a plurality of air return pipes, the two air blowing ship bodies and the air suction ship body are arranged above the drying cavity side by side in the width direction of the drying cavity, and the air suction ship body is clamped between the two air blowing ship bodies; the multiple air nozzles and the multiple air return pipes are alternately arranged at the top of the drying cavity at intervals in the length direction of the drying cavity, strip-shaped air blowing openings are formed in the joints of the two air blowing ship bodies and the air nozzles, a plurality of air inlet guide plates used for enabling inlet air to be evenly distributed on the air nozzles are arranged on the air nozzles, and strip-shaped air suction openings are formed in the joints of the air suction ship bodies and the air return pipes. And a plurality of air exhaust guide plates for uniformly guiding air to the strip-shaped air suction openings from the air return pipe are arranged on the air return pipe. The air flow uniformity in the oven can be improved, NMP accumulation caused by small local air flow is prevented, and the hidden danger of oven explosion is eliminated.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery production, and particularly to a wide-width infrared oven for positive electrode coating baking, which can make the air flow in the oven more uniform and is beneficial to preventing the explosion of the oven. Background Art

[0002] In the production and manufacturing of lithium batteries, the baking process of lithium battery electrode sheets is an important step. The infrared oven uses infrared radiation to dry the electrode sheets. Compared with the hot air oven, the heating in the coating thickness direction is more uniform, which can reduce the cracking of the coating. Since the material coated on the positive electrode sheet contains NMP solvent, after baking, NMP evaporates into the air. NMP itself is a flammable and explosive gas at high temperatures. When the NMP concentration reaches the explosion limit value, it is easy to cause the explosion of the oven. Therefore, an air inlet and exhaust system is provided on the infrared oven to take away the NMP gas.

[0003] As Figure 5 shown, in the traditional infrared oven 60, the air suction hull 61 is arranged above the air blowing hull, and the return air pipe 65 is connected to the air suction hull 61 through the side wall connecting pipes 63 at both ends. When the width of the oven is relatively large, because the cross-sectional area of the side wall connecting pipe 63 is small and it is far from the center part of the return air pipe, the suction force in the middle part of the return air pipe 65 is small. Most of the gas in the oven is sucked away from both ends of the return air pipe 65, and the air flow mainly flows to both sides of the oven, resulting in relatively less air flow near the middle part of the return air pipe 65. Therefore, the NMP gas in the middle part of the return air pipe 65 is not easily taken out of the oven, leading to local NMP accumulation. When the accumulated NMP concentration reaches the explosion limit value, it is easy to cause the explosion of the oven. Utility Model Content

[0004] Based on this, this application provides a wide-width infrared oven, which can improve the uniformity of gas flow in the oven, prevent the accumulation of NMP due to small local gas flow, and eliminate the hidden danger of oven explosion.

[0005] To achieve the above object, the technical solution adopted in this application is as follows:

[0006] A wide-width infrared oven, comprising a drying chamber, two blowing hulls, one suction hull, a plurality of air nozzles and a plurality of return air ducts. The blowing hulls and the suction hull extend along the length direction of the drying chamber. The air nozzles and the return air ducts extend along the width direction of the drying chamber. The two blowing hulls and the one suction hull are arranged side by side above the drying chamber along the width direction of the drying chamber. The suction hull is clamped between the two blowing hulls. The plurality of air nozzles and the plurality of return air ducts are alternately and spaced along the length direction of the drying chamber and arranged at the top of the drying chamber. Strip-shaped air blowing openings are provided at the joints of the two blowing hulls and the air nozzles. A number of air inlet guide plates for evenly distributing the incoming air to the air nozzles are provided on the air nozzles. A strip-shaped air suction opening is provided at the joint of the suction hull and the return air duct. A number of exhaust air guide plates for evenly guiding the air from the return air duct to the strip-shaped air suction opening are provided on the return air duct.

[0007] Further, it further comprises an infrared heating device. The infrared heating device is arranged below the air nozzles. The infrared heating device comprises a lamp tube box and infrared lamp tubes arranged in the lamp tube box. The lamp tube box is hermetically arranged, and the lower end housing of the lamp tube box is a wave-transmitting plate.

[0008] Further, the lower end of the air nozzle is arranged as a flared opening. The lamp tube box is plugged at the flared opening. Slit openings are reserved between the two side edges of the flared opening and the lamp tube box. The air nozzle communicates with the drying chamber through the slit openings.

[0009] Further, it further comprises a lamp tube cooling assembly. The lamp tube cooling assembly comprises a cooling air duct, a cold air inlet main pipe, cold air inlet branch pipes, a cold air exhaust main pipe and cold air exhaust branch pipes. The cooling air duct is arranged in the lamp tube box and extends along the length direction of the lamp tube box. A number of through holes communicating with the inner cavity of the lamp tube box are provided on the cooling air duct. One end of the cooling air duct is connected to the cold air inlet main pipe through the cold air inlet branch pipe. The end of the lamp tube box far from the cold air inlet branch pipe is connected to the cold air exhaust main pipe through the cold air exhaust branch pipe.

[0010] Further, it further comprises a traction roller group. The traction roller group is arranged in the drying chamber and is used for traction of the pole piece through the drying chamber.

[0011] Further, a bottom blowing air duct is provided at the bottom of the drying chamber.

[0012] Further, it further comprises a air supply pipeline with a blowing fan and an air extraction pipeline with an air extraction fan. The two blowing hulls and the bottom blowing air duct are all communicated with the air supply pipeline. The suction hull is communicated with the air extraction pipeline.

[0013] In the wide-width infrared oven of the present application, two air-blowing hulls and an air-sucking hull are arranged side by side along the width direction of the drying chamber. The air-sucking hull is arranged between the two air-blowing hulls. A strip-shaped air-blowing port communicating with air nozzles is opened on the air-blowing hull. The gas blown in from the strip-shaped air-blowing port is uniformly guided into the air nozzles by a number of air inlet guide plates, and then enters the drying chamber through the air nozzles. A strip-shaped air-sucking port communicating with a return air pipe is opened on the air-sucking hull. The gas in the drying chamber enters the return air pipe and is guided to the strip-shaped air-sucking port by a number of exhaust guide plates, then enters the air-sucking hull from the strip-shaped air-sucking port, and is discharged from the air-sucking hull. In this way, the air inlet of the air nozzles can be ensured to be uniform, and because the strip-shaped air-sucking port expands the length of the air-sucking port in the width direction of the drying chamber, the return air pipe can suck air from the drying chamber more uniformly, thereby improving the uniformity of gas flow in the wide-width oven and preventing the accumulation of NMP due to small local gas flow, so as to eliminate the hidden danger of explosion in the wide-width oven. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of the wide-width infrared oven according to the embodiment of the present application.

[0016] Figure 2 is Figure 1 A schematic cross-sectional view of the wide-width infrared oven shown at the strip-shaped air-blowing port of the air-blowing hull.

[0017] Figure 3 is Figure 1 A schematic cross-sectional view of the wide-width infrared oven shown at the strip-shaped air-sucking port of the air-sucking hull.

[0018] Figure 4 is Figure 1 A schematic structural diagram of the infrared heating device in the wide-width infrared oven shown.

[0019] Figure 5 It is a schematic structural diagram of a traditional infrared oven.

[0020] Explanation of the Reference Numerals:

[0021] 10. Drying chamber; 21. Blowing hull; 211. Strip-shaped blowing air outlet; 22. Suction hull; 221. Strip-shaped suction air outlet; 23. Air nozzle; 231. Air inlet flow deflector; 232. Slit; 24. Return air duct; 241. Exhaust air flow deflector; 25. Bottom blowing air duct of the chamber; 26. Air supply pipeline; 27. Air extraction pipeline; 31. Guide roller; 40. Infrared heating device; 41. Lamp tube box; 411. Wave-transmitting plate; 42. Infrared lamp tube; 51. Total cold air inlet main pipe; 52. Cold air inlet branch pipe; 53. Total cold air exhaust main pipe; 54. Cold air exhaust branch pipe; 55. Cooling air duct; 551. Through hole; 60. Conventional infrared oven; 61. Suction hull; 62. Blowing hull; 63. Side wall connecting pipe; 64. Air nozzle; 65. Suction air pipe. Detailed implementation manners

[0022] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. The present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0027] Reference Figures 1 to 3 , this application provides a wide-width infrared oven, which includes a drying chamber 10, two blowing hulls 21, one suction hull 22, a plurality of air nozzles 23 and a plurality of return air ducts 24.

[0028] Both the blowing hull 21 and the suction hull 22 extend along the length direction of the drying chamber 10, and both the air nozzles 23 and the return air ducts 24 extend along the width direction of the drying chamber 10. The two blowing hulls 21 and one suction hull 22 are arranged side by side along the width direction of the drying chamber 10 above the drying chamber 10, and the suction hull 22 is clamped between the two blowing hulls 21. A plurality of air nozzles 23 and a plurality of return air ducts 24 are alternately and spaced along the length direction of the drying chamber 10 at the top of the drying chamber 10. Strip-shaped air blowing openings 211 are provided at the joints of the two blowing hulls 21 and the air nozzles 23. A number of air inlet guide plates 231 for evenly distributing the incoming air to the air nozzles 23 are provided on the air nozzles 23. A strip-shaped air suction opening 221 is provided at the joint of the suction hull 22 and the return air ducts 24. A number of exhaust air guide plates 241 for evenly guiding the air from the return air ducts 24 to the strip-shaped air suction opening 221 are provided on the return air ducts 24.

[0029] For the wide-width infrared oven of the present application, two air-blowing hulls 21 and an air-sucking hull 22 are arranged side by side along the width direction of the drying chamber 10. The air-sucking hull 22 is arranged between the two air-blowing hulls 21. A strip-shaped air-blowing port 211 communicating with an air nozzle 23 is opened on the air-blowing hull 21. The gas blown in from the strip-shaped air-blowing port 211 is evenly guided into the air nozzle 23 by a plurality of air inlet guide plates 231, and then enters the drying chamber 10 through the air nozzle 23. A strip-shaped air-sucking port 221 communicating with a return air pipe 24 is opened on the air-sucking hull 22. The gas in the drying chamber 10 enters the return air pipe 24 and is guided to the strip-shaped air-sucking port 221 by a plurality of exhaust guide plates 241, and then enters the air-sucking hull 22 from the strip-shaped air-sucking port 221 and is discharged from the air-sucking hull 22. In this way, the air inlet of the air nozzle 23 can be ensured to be uniform, and because the strip-shaped air-sucking port 221 expands the length of the air-sucking port in the width direction of the drying chamber 10, the return air pipe 24 can suck air from the drying chamber 10 more evenly, thereby improving the uniformity of gas flow in the wide-width oven and preventing the accumulation of NMP due to small local gas flow, so as to eliminate the hidden danger of explosion in the wide-width oven.

[0030] The wide-width infrared oven of this embodiment further includes a traction roller group for pulling the pole piece through the drying chamber 10. The traction roller group includes a plurality of guide rollers 31 evenly spaced along the length direction of the drying chamber 10.

[0031] Reference Figure 1 , based on the previous technical solutions, it can also be set that a bottom blowing air pipe 25 is provided at the bottom of the drying chamber 10. It can be understood that in the drying chamber 10, NMP vapor may also enter below the pole piece. By providing the bottom blowing air pipe 25 at the bottom of the drying chamber 10, the accumulation of NMP vapor below the pole piece can be prevented.

[0032] Such as Figure 1 As shown, the wide-width infrared oven of this embodiment further includes a air supply pipe 26 with a blowing fan and an air extraction pipe 27 with an exhaust fan. The two air-blowing hulls 21 and the bottom blowing air pipe 25 are both communicated with the air supply pipe 26, and the air-sucking hull 22 is communicated with the air extraction pipe 27. In this way, the blowing fan blows fresh air into the two air-blowing hulls 21 and the bottom blowing air pipe 25, and the exhaust fan takes away the gas with NMP in the air-sucking hull 22.

[0033] Reference Figure 1 and Figure 4, in the wide-width infrared oven of this embodiment, an infrared heating device 40 is provided below any air nozzle 23. The infrared heating device 40 includes a lamp tube box 41 and infrared lamp tubes 42 arranged in the lamp tube box 41. The lamp tube box 41 is hermetically arranged, and the lower end housing of the lamp tube box 41 is a wave-transmitting plate 411. The infrared lamp tubes 42 emit infrared rays, and the infrared rays penetrate through the wave-transmitting plate 411 and irradiate on the coating of the electrode plate, which can uniformly heat the coating in the thickness direction, and the coating is not easy to crack. The lamp tube box 41 is hermetically arranged so that the infrared lamp tubes 42 cannot directly contact the gas in the drying chamber 10, which can avoid the explosion risk caused by the ignition of NMP gas when the infrared lamp tubes 42 generate electric sparks.

[0034] Specifically, the lower end of the air nozzle 23 is set as a flared opening, the lamp tube box 41 is blocked at the flared opening, and there are slit openings 232 reserved between the two side edges of the flared opening and the lamp tube box 41. The air nozzle 23 communicates with the drying chamber 10 through the slit openings 232. The lamp tube box 41 is arranged at the lower end of the air nozzle 23, and the air nozzle 23 blows air into the drying chamber 10 from the slit openings 232 on both sides. In this way, the fresh air can absorb the heat of the lamp tube box 41. On the one hand, it can cool down the lamp tube box 41, and on the other hand, it can heat the fresh air, which is beneficial to energy saving.

[0035] Reference Figure 1 and Figure 4 , it can also be set that the wide-width infrared oven of this embodiment further includes a lamp tube cooling assembly. The lamp tube cooling assembly includes a cooling air duct 55, a cold air inlet main pipe 51, cold air inlet branch pipes 52, a cold air exhaust main pipe 53 and cold air exhaust branch pipes 54. The cooling air duct 55 is arranged in the lamp tube box 41 and extends along the length direction of the lamp tube box 41. A plurality of through holes 551 communicating with the inner cavity of the lamp tube box 41 are provided on the cooling air duct 55. One end of the cooling air duct 55 is connected to the cold air inlet main pipe 51 through the cold air inlet branch pipe 52, and one end of the lamp tube box 41 far from the cold air inlet branch pipe 52 is connected to the cold air exhaust main pipe 53 through the cold air exhaust branch pipe 54.

[0036] It can be understood that cold air is blown into the cold air inlet main pipe 51, the cold air enters each infrared heating device 40 through each cold air inlet branch pipe 52, and then the cold air passing through each infrared heating device 40 is collected into the cold air exhaust main pipe 53 through each cold air exhaust branch pipe 54 and then discharged from the cold air exhaust main pipe 53. In the infrared heating device 40, the cold air enters the inner cavity of the lamp tube box 41 from the cooling air duct 55 through a plurality of through holes 551, and then advances in a spiral form in a turbulent flow and enters the cold air exhaust branch pipe 54. The lamp tube cooling assembly can cool down the infrared lamp tubes 42 and the lamp tube box 41, so that the temperature of the gas near the lamp tube box 41 will not be too high, which is beneficial to the uniform heat in the drying chamber 10.

[0037] It can also be set that the cold air exhaust main pipe 53 is communicated with the air supply duct 26. In this way, after the cold air passes through the infrared heating device 40 and is heated up before entering the drying chamber 10, the heat in the lamp tube box 41 can be utilized, which is beneficial to energy conservation.

[0038] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0039] The above-described embodiments only represent several implementation manners of the present application, and thus cannot be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A wide-width infrared oven, characterized in that: The invention comprises a drying chamber, two blowing hulls, a suction hull, a plurality of air nozzles and a plurality of return air ducts, wherein the blowing hull and the suction hull both extend along the length direction of the drying chamber, and the air nozzles and the return air duct both extend along the width direction of the drying chamber, the two blowing hulls and the suction hull are arranged side by side above the drying chamber along the width direction of the drying chamber, the suction hull is clamped between the two blowing hulls, a plurality of air nozzles and a plurality of return air ducts are alternately and spacedly arranged at the top of the drying chamber along the length direction of the drying chamber, a strip blowing port is provided at the junction of the two blowing hulls and the air nozzles, a plurality of air inlet guide plates for evenly distributing the incoming air to the air nozzles are provided on the air nozzles, a strip suction port is provided at the junction of the suction hull and the return air duct, and a plurality of exhaust guide plates for evenly guiding air from the return air duct to the strip suction port are provided on the return air duct.

2. The wide-width infrared oven according to claim 1, characterized in that: It also includes an infrared heating device, which is arranged below the wind nozzle. The infrared heating device includes a lamp tube box and an infrared lamp tube arranged in the lamp tube box. The lamp tube box is sealed, and the lower end shell of the lamp tube box is a wave-transmitting plate.

3. The wide-width infrared oven according to claim 2, characterized in that: The lower end of the air nozzle is configured as a bell mouth, the lamp tube box is blocked at the bell mouth, and slits are reserved between the two sides of the bell mouth and the lamp tube box, and the air nozzle is connected to the drying chamber through the slits.

4. The wide-width infrared drying oven according to claim 2 or 3, characterized in that: It also includes a lamp tube cooling component, which includes a cooling air duct, a cold air inlet main pipe, a cold air inlet branch pipe, a cold air exhaust main pipe and a cold air exhaust branch pipe. The cooling air duct is arranged in the lamp tube box and extends along the length direction of the lamp tube box. The cooling air duct is provided with a plurality of through holes connected to the inner cavity of the lamp tube box. One end of the cooling air duct is connected to the cold air inlet main pipe through the cold air inlet branch pipe, and the end of the lamp tube box away from the cold air inlet branch pipe is connected to the cold air exhaust main pipe through the cold air exhaust branch pipe.

5. The wide-width infrared oven according to claim 1, characterized in that: It also includes a traction roller group, which is arranged in the drying chamber and is used to pull the pole piece through the drying chamber.

6. The wide-width infrared oven according to claim 1, characterized in that: A cavity bottom blowing pipe is arranged at the cavity bottom of the drying cavity.

7. The wide-width infrared oven according to claim 6, characterized in that: It also includes an air supply duct with a blowing fan and an exhaust duct with an exhaust fan. The two blowing hulls and the cavity bottom blowing pipe are both connected to the air supply duct, and the suction hull is connected to the exhaust duct.

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