Coating oven and coating equipment

Abstract

The utility model discloses a coating oven and coating equipment. The coating oven comprises an oven body which is provided with a cavity, an air inlet and an air outlet; the air guide box body group is positioned in the cavity and is communicated with the air inlet; the air blowing assembly is located in the cavity, communicates with the air guide box body set and is used for blowing air to the to-be-dried workpieces passing through the workpiece conveying path; the air return box body is located in the cavity and communicates with the air outlet, the air return box body is provided with an air return opening, the air guide box body set comprises at least two first air guide box bodies, the first air guide box bodies are arranged at intervals in the first direction and extend in the second direction, and the first air guide box bodies are located on the same side of the workpiece conveying path in the third direction; the interval between every two adjacent first air guide box bodies communicates with the corresponding air return opening, and the first direction, the second direction and the third direction intersect with one another. According to the coating oven and the coating equipment, the gas flow area is increased, and the drying consistency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a coating oven and coating equipment used in the battery manufacturing process. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] With the continuous development of batteries, higher requirements are placed on the performance of battery production equipment. Drying the electrode-forming slurry coated on the sheet is one of the key links in battery production. The drying effect of the coating oven affects the production efficiency and manufacturing quality of the battery. Therefore, how to improve the drying effect of the coating oven is one of the research directions of the industry. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a coating oven and a coating device including the coating oven, which can improve the drying effect of the workpiece and enhance the overall drying consistency of the workpiece.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides a coating oven, which includes a box body, having a cavity, an air inlet and an air outlet; an air guide box group, which is located in the cavity and connected to the air inlet; a blowing assembly, which is located in the cavity and connected to the air guide box group, and the blowing assembly is used to blow air to a workpiece to be dried passing through a workpiece conveying path; a return air box, which is located in the cavity and connected to the air outlet, and the return air box has a return air opening, and the air guide box group includes at least two first air guide boxes, the first air guide boxes are arranged at intervals along a first direction and extend respectively along a second direction, the first air guide boxes are located on the same side of the workpiece conveying path along a third direction, and the spaces on both sides of each first air guide box along the first direction are connected to the return air opening, and the first direction, the second direction and the third direction intersect with each other.

[0007] In the embodiment of the present application, since there is a gap between adjacent first air guide boxes and the gap is connected to the return air opening, the gas blown out of the blowing assembly into the coating oven can flow into the return air box through the space on both sides of each first air guide box along the first direction including the gap between the first air guide boxes. Compared with the conventional case of only one air guide box, the hot air flow area is increased, the gas unevenness on the workpiece surface is reduced, and the drying consistency of the workpiece is improved. In addition, the pressure of the gas on the workpiece surface becomes more balanced, the movement of the workpiece in the workpiece conveying path is more stable, and it is also helpful to improve the drying consistency of the workpiece as a whole.

[0008] In some embodiments, a first air inlet box is provided at one end of the first air guide box in the second direction, and each first air guide box is connected to the air inlet via the first air inlet box; a return air box is provided at the other end of the first air guide box in the second direction, and the return air opening opens along the second direction toward the side where the first air inlet box is located.

[0009] In an embodiment of the present application, the first air inlet box and the return air box are respectively located at the two end positions in the extension direction of the first air guide box, which is conducive to the gas passing through the entire first air guide box as much as possible, so that the workpieces in the coating oven can be blown and dried in the largest possible range.

[0010] In some embodiments, the blowing assembly and the return air box are respectively located on two sides of the first air guide box along the third direction, and the blowing assembly is located on a side close to the workpiece conveying path along the third direction.

[0011] By arranging the blowing assembly, the first air guide box and the return air box in sequence along the third direction, it is beneficial for the gas to circulate in the coating oven along the third direction, and it is beneficial to fully utilize the gas to blow and dry the workpiece.

[0012] In some embodiments, the return air opening is located on a side of the return air box body, the width of the return air opening along the first direction is greater than the width of the interval between adjacent first air guide boxes along the first direction, and the return air opening spans the interval along the first direction.

[0013] By making the width of the return air opening along the first direction larger than the width of the gap between adjacent first air guide boxes along the first direction, and arranging it across the gap, the gas flowing through the gap can flow into the return air box faster and in greater quantities, thereby increasing the gas circulation rate, further weakening the impact of the gas on the workpiece surface, and making the workpiece drying more uniform.

[0014] In some embodiments, a plurality of air equalizing plates are provided in the return air box body, the air equalizing plates extend from the return air opening along the second direction toward the return air box body and are arranged at intervals along the first direction, and a plurality of return air gaps are formed between the air equalizing plates and the side surfaces of the return air box body and between adjacent air equalizing plates along the first direction; a return air cavity is provided on the side of the air equalizing plate facing away from the return air opening, and each return air gap is connected to the air outlet via the return air cavity.

[0015] By arranging an air distribution plate at the return air opening, the return air uniformity of the return air box is improved, which helps to reduce the impact of gas on the surface of the workpiece. The structure is simple, the installation is convenient, and the replacement is easy.

[0016] In some embodiments, the gap width of the return air gap along the first direction is in the range of 100 mm to 250 mm.

[0017] By setting the spacing distance between the air balancing plates along the first direction, the return air difference can be reduced, and the return air uniformity of the return air box can be further improved. In addition, by designing the number of air balancing plates and the gap width, the opening width of the return air opening in the first direction can cover the entire air guide box group, which helps to further increase the flow area of ​​hot air and improve the efficiency and drying consistency of air drying.

[0018] In some embodiments, the blowing assembly includes a plurality of first air nozzles extending along a first direction, the plurality of first air nozzles are arranged at intervals along a second direction, and each first air nozzle is connected to all first air guide boxes.

[0019] Thereby, the gas introduced by the first air guide box can be blown out more evenly, which helps to improve the uniformity of the gas on the workpiece surface and improve the drying consistency.

[0020] In some embodiments, the air guide box group also includes at least one second air guide box, a second air inlet box is provided at one end of the second direction of the second air guide box, and the second air guide box is connected to the air inlet via the second air inlet box; along the third direction, the second air guide box is located on the opposite side of the first air guide box relative to the workpiece conveying path.

[0021] By further providing a second air guide box, air can be blown and dried from both sides of the workpiece, thereby improving the workpiece drying efficiency for workpieces that need to be dried on both sides.

[0022] In some embodiments, the blowing assembly includes a plurality of second air nozzles extending along the first direction, the plurality of second air nozzles are arranged at intervals along the second direction, and each second air nozzle is connected to the second air guide box.

[0023] Thereby, the gas introduced by the second air guide box can be blown out more evenly, which helps to improve the uniformity of the gas on the workpiece surface and improve the drying consistency.

[0024] In some embodiments, the flow area of ​​each first air guide box gradually decreases as it moves away from the first air inlet box along the second direction.

[0025] This helps to improve the uniformity of the gas flow rate, helps to improve the uniformity of the gas pressure on the workpiece surface, and improves the transportation stability of the workpiece.

[0026] In some embodiments, the flow area of ​​the second air guide box gradually decreases as it moves away from the second air inlet box along the second direction.

[0027] This helps to improve the uniformity of the gas flow rate, helps to improve the uniformity of the gas pressure on the workpiece surface, and improves the transportation stability of the workpiece.

[0028] In some embodiments, the coating oven further includes a heat exchange filtering device, the air outlet is connected to the heat exchange filtering device, and the heat exchange filtering device is connected to the air inlet.

[0029] By providing a heat exchange and filtering device, the gas that has completed workpiece drying can be recycled and reused, thereby reducing energy loss and reducing adverse effects on the environment.

[0030] In some embodiments, the workpiece to be dried is a sheet including a slurry layer for forming an electrode.

[0031] This allows the sheet including the electrode-forming slurry layer to be dried satisfactorily, thereby contributing to improved manufacturing quality of the battery.

[0032] A second aspect of the present application provides a coating device, which includes a workpiece conveying device and the coating oven as described above, wherein the workpiece conveying device is used to allow the workpiece to be dried to pass through a workpiece conveying path in the coating oven.

[0033] This allows for continuous, more uniform drying.

[0034] The beneficial effects of the embodiments of the present application include: improving the drying effect of the workpiece and improving the overall drying consistency of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] Figure 1 A schematic diagram of the box structure of a coating oven provided in some embodiments of the present application;

[0037] Figure 2A schematic diagram of the internal device of a coating oven provided for some embodiments of the present application;

[0038] Figure 3 for Figure 1 The AA cross-sectional schematic diagram of the coating oven provided by some embodiments of the present application is shown;

[0039] Figure 4 A schematic diagram of the structure of a return air box provided for some embodiments of the present application;

[0040] Figure 5 for Figure 4 The BB cross-sectional schematic diagram of the return air box provided by some embodiments of the present application is shown;

[0041] Figure 6 A bottom view of a first air nozzle provided for some embodiments of the present application;

[0042] Figure 7 A schematic diagram of the composition of a coating device provided for some embodiments of the present application.

[0043] Description of Reference Numerals

[0044] 1000 coating equipment; 100 coating oven; 200 workpiece conveying device; 1 box; 11 cavity; 12 air inlet; 13 air outlet; 141 workpiece inlet; 142 workpiece outlet; 2 air guide box group; 21 first air guide box; 22 interval; 23 second air guide box; 3 blowing assembly; 31 first air nozzle; 311 first air outlet; 32 second air nozzle; 4 return air box; 41 return air opening; 42 air balancing plate; 43 return air cavity; 44 return air gap; 51 first air inlet box; 52 second air inlet box; 6 workpiece; 7 heat exchange filtering device; d1 width of the return air opening along the first direction; d2 width of the interval along the first direction. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "connection" should be understood in a broad sense, for example, it can be direct connection or connection through an intermediate medium layer; it can be fixed connection or detachable connection, or integrated. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0052] Below, this application is described in detail.

[0053] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage. In new energy vehicles equipped with batteries, batteries can be used to provide power in whole or in part. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0054] With the continuous development of batteries, higher requirements are placed on the performance of battery production equipment. Drying the electrode-forming slurry coated on the sheet is one of the key links in battery production. The drying effect of the coating oven affects the production efficiency and manufacturing quality of the battery. Therefore, how to improve the drying effect of the coating oven is one of the research directions of the industry.

[0055] In the related art, the coating oven has an air guide box located roughly in the middle, and gas is blown toward the workpiece from the air guide box. After the gas dries the workpiece, the air is returned from both sides of the air guide box. According to research, when the coating oven is drying the workpiece, if the gas in the middle of the coating oven flows back to both sides of the coating oven, there is a situation where the flow area of ​​the hot air is too small, and there is a risk that when the middle of the workpiece is completely dry, the edge of the workpiece will crack due to over-drying, or when the edge of the workpiece is completely dry, the middle part of the workpiece is under-dried. In addition, the design of air return on both sides also has the risk of high pressure in the center of the workpiece surface, resulting in unstable workpiece conveying state.

[0056] Research has found that by setting the two air guide boxes at intervals and making the interval between the air guide boxes also serve as a return air channel, the flow area of ​​the return air gas can be increased, which helps to make the air flow field in the coating oven more evenly distributed, and reduce the impact of uneven pressure of the gas on the surface of the workpiece, so that the overall drying consistency of the workpiece is better. In addition, the stable movement of the workpiece in the workpiece conveying path also helps to improve the overall drying consistency of the workpiece.

[0057] Based on such a design concept, the inventor of the present application designed a coating oven, which includes a box body, having a cavity, an air inlet and an air outlet; an air guide box group, which is located in the cavity and connected to the air inlet; a blowing assembly, which is located in the cavity and connected to the air guide box group, and the blowing assembly is used to blow air to the workpiece to be dried passing through the workpiece conveying path; a return air box, which is located in the cavity and connected to the air outlet, and the return air box has a return air opening, and the air guide box group includes at least two first air guide boxes, the first air guide boxes are arranged at intervals along a first direction and extend respectively along a second direction, the first air guide boxes are located on the same side of the workpiece conveying path along the third direction, and the spaces on both sides of each first air guide box along the first direction are connected to the return air opening, and the first direction, the second direction and the third direction intersect with each other.

[0058] Since there is a gap between adjacent first air guide boxes and the gap is connected to the return air opening, the gas blown out of the blowing assembly into the oven can flow into the return air box through the spaces on both sides of each first air guide box along the first direction, including the gap between the first air guide boxes. Compared with the conventional case of only one air guide box, the hot air flow area is increased, the unevenness of the gas on the workpiece surface is reduced, and the drying consistency of the workpiece is improved. In addition, the pressure of the gas on the workpiece surface becomes more balanced, the movement of the workpiece in the workpiece conveying path is more stable, and it is also helpful to improve the drying consistency of the workpiece as a whole.

[0059] An embodiment of the present application further provides a coating device, which includes a workpiece conveying device and the coating oven as described above, wherein the workpiece conveying device is used to allow the workpiece to be dried to pass through a workpiece conveying path in the coating oven.

[0060] The coating oven and coating equipment provided in the embodiments of the present application can be used for, but not limited to, drying scenarios of battery pole pieces.

[0061] In an embodiment of the present application, the workpiece can be used to manufacture a positive electrode sheet of a battery cell or a negative electrode sheet of a battery cell. The electrode sheet may include a current collector and an active material layer. The active material may be a positive electrode active material or a negative electrode active material.

[0062] As an example, the current collector has two surfaces facing each other in its thickness direction, and the active material is disposed on either or both of the two facing surfaces of the current collector.

[0063] As an example, the positive electrode current collector may be a metal foil or a composite current collector. As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0064] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0065] As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0066] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0067] Figure 1 A three-dimensional diagram of a coating oven provided for some embodiments of the present application; Figure 2 A schematic diagram of the internal device of a coating oven provided for some embodiments of the present application; Figure 3 for Figure 1 The AA cross-sectional schematic diagram of the coating oven provided by some embodiments of the present application is shown; Figure 4 A schematic diagram of the structure of a return air box provided for some embodiments of the present application; Figure 5 for Figure 4 The BB cross-sectional schematic diagram of the return air box provided by some embodiments of the present application is shown; Figure 6 A bottom view of a first air nozzle provided for some embodiments of the present application; Figure 7 A schematic diagram of the composition of a coating device provided for some embodiments of the present application.

[0068] In some embodiments, Figures 1 to 3 As shown, the embodiment of the present application provides a coating oven 100. The coating oven 100 includes: a box body 1, having a cavity 11, an air inlet 12 and an air outlet 13; an air guide box body group 2, located in the cavity 11 and connected to the air inlet 12; a blowing assembly 3, located in the cavity 11 and connected to the air guide box body group 2, and the blowing assembly 3 is used to blow air to the workpiece 6 to be dried passing through the workpiece conveying path; a return air box body 4, located in the cavity 11 and connected to the air outlet 13, and the return air box body 4 has a return air opening 41, and the air guide box body group 2 includes at least two first air guide boxes 21, the first air guide boxes 21 are arranged at intervals along the first direction X and extend respectively along the second direction Y, the first air guide boxes 21 are located on the same side of the workpiece conveying path along the third direction Z, and the spaces on both sides of each first air guide box body 21 along the first direction X are connected to the return air opening 41, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0069] In some embodiments of the present application, for the convenience of description, a first direction, a second direction, and a third direction are set, and the first direction, the second direction, and the third direction are directions that intersect each other. Figures 1 to 7 In the illustrated embodiment, the first direction, the second direction, and the third direction are perpendicular to each other. However, those skilled in the art should understand that the embodiments of the present application are not limited to the case where the three directions are perpendicular to each other. Figures 1 to 7 As shown by the arrows in , the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction. Sometimes the direction indicated by arrow Z along the third direction is called "top", and the opposite direction is called "bottom".

[0070] like Figure 1 and Figure 2 As shown, the box body 1 is provided with an air inlet 12 and an air outlet 13, the air inlet 12 is used to allow gas to flow in, and the air outlet 13 is used to allow gas to flow out, and a cavity 11 is formed inside the box body 1, and the cavity 11 is used to accommodate the internal devices of the oven. Optionally, the gas can be hot air. The hot air temperature can be set according to actual conditions, and can be set to 40°C, 60°C, 80°C, etc. for example.

[0071] Optionally, the box body 1 may be a cube, a cuboid, a sphere or other shapes, which is not limited in this embodiment.

[0072] Optionally, the air inlet 12 and / or the air outlet 13 may be square, rectangular, circular or other shapes; the air inlet 12 and / or the air outlet 13 may be one or more; the air inlet 12 and / or the air outlet 13 may be located at the top, bottom or side of the box 1. As a specific example in the embodiment of the present application, the air inlet 12 and the air outlet 13 are arranged near the top of the box 1.

[0073] In some embodiments, the box 1 may have an opening that allows the workpiece 6 to be dried to enter and exit. The opening may be one, and the workpiece 6 to be dried enters the box 1 from the opening, and is pushed out from the opening after the workpiece 6 is dried; the opening may be two, namely a workpiece inlet 141 and a workpiece outlet 142, and the workpiece 6 to be dried enters the box 1 through the workpiece inlet 141, and is pushed out from the workpiece outlet 142 after the workpiece 6 is dried, which is conducive to strengthening the continuity of the drying of the workpiece 6 and accelerating the improvement of the drying efficiency of the workpiece 6. This application does not make any special restrictions on the shape, position, and number of the openings.

[0074] like Figure 1 and Figure 2 As shown, the air guide box group 2 is located in the cavity 11 , and after the gas enters from the air inlet 12 , it can flow into the air guide box group 2 connected to the air inlet 12 .

[0075] Optionally, the air inlet 12 may be directly connected to the air guide box assembly 2, or the air inlet 12 may be connected to the air guide box assembly 2 via a pipeline (eg, a first air inlet box described later).

[0076] like Figure 1 and Figure 2 As shown, the blowing assembly 3 is located in the cavity 11, and the gas flows through the air guide box group 2 and is blown out from the blowing assembly 3 connected to the air guide box group 2. The blown gas is used to blow air to the workpiece 6 to be dried passing through the workpiece conveying path.

[0077] Optionally, the blowing assembly 3 may be located at the top or bottom of the air guide box assembly 2, and is configured to blow air toward the workpiece to be dried 6. In some embodiments, the blowing port of the blowing assembly 3 is directed toward the part to be dried in the workpiece to be dried.

[0078] like Figure 2 As shown, the return air box 4 is located in the cavity 11 , and the gas in the cavity 11 flows into the return air box 4 from the return air opening 41 , and then flows out from the air outlet 13 connected to the return air box 4 .

[0079] Optionally, the return air box 4 may be square, rectangular, circular or other shapes; the return air box 4 may be one or more; the return air box 4 may be located at the top, bottom or side of the air guide box group 2. In one embodiment of the present application, the return air box 4 is generally formed as a rectangular box and is arranged at the top of the air guide box group 2.

[0080] Optionally, the return air opening 41 may be square, rectangular, circular or other shapes; there may be one or more return air openings 41; the return air opening 41 may be located at the top, bottom or side of the return air box 4. In one embodiment of the present application, a plurality of return air openings 41 are formed along the first direction, and each return air opening 41 is generally formed in a rectangular shape.

[0081] like Figure 2 As shown, the air guide box group 2 includes at least two first air guide boxes 21, the first air guide boxes 21 are arranged at intervals along the first direction X, the first air guide boxes 21 extend along the second direction Y, and the first air guide boxes 21 are located on the same side of the workpiece conveying path along the third direction Z. Along the first direction X, the spaces on both sides of the first air guide box 21 are connected to the return air opening 41, that is, the gas in the cavity 11 (mainly the gas after being used to dry the workpiece 6) can flow through the spaces on both sides of the first air guide box 21 including the interval 22 and flow into the return air opening 41.

[0082] Optionally, there may be two first air guide boxes 21, and a gap 22 is formed between the two first air guide boxes 21; there may be three first air guide boxes 21, and two gaps 22 are formed by the three first air guide boxes 21; there may be four or five first air guide boxes 21, etc., which are not limited in this embodiment. In the embodiment of the present application, two first air guide boxes 21 are used as an example for illustration.

[0083] Specifically, the two first air guide boxes 21 are arranged along the second direction Y, and a gap 22 is provided between the two first air guide boxes 21. The gap 22 is connected to the cavity 11, for example Figure 2 As shown, the top of the interval 22 and both ends in the second direction Y are open, which facilitates hot air to flow into the interval 22 and enter the return air opening 41 through the interval 22. The interval 22 has a certain width along the first direction X, which can be set in combination with the space size of the cavity 11, the width of the first air guide box 21 in the first direction, etc.

[0084] In the embodiment of the present application, since there is a gap 22 between adjacent first air guide boxes 21 and the gap 22 is connected to the return air opening 41, the gas blown out of the blowing assembly 3 into the coating oven 100 can flow into the return air box 4 through the space on both sides of each first air guide box 21 along the first direction X, including the gap 22 between the first air guide boxes 21. Compared with the conventional case of only one air guide box, the hot air flow area is increased, the gas unevenness on the surface of the workpiece 6 is reduced, and the drying consistency of the workpiece 6 is improved. In addition, the pressure of the gas on the surface of the workpiece 6 becomes more balanced, the movement of the workpiece in the workpiece conveying path is more stable, and it is also helpful to improve the drying consistency of the workpiece 6 as a whole.

[0085] In some embodiments, a first air inlet box 51 is provided at one end of the first air guide box 21 in the second direction Y, and each first air guide box 21 is connected to the air inlet 12 via the first air inlet box 51; a return air box 4 is provided at the other end of the first air guide box 21 in the second direction Y, and the return air opening 41 opens along the second direction Y toward the side where the first air inlet box 51 is located.

[0086] like Figure 2 As shown, along the second direction Y, a first air inlet box 51 is provided at one end of the first air guide box 21 , and each first air guide box 21 is connected to the air inlet 12 via the first air inlet box 51 .

[0087] Optionally, the first air inlet box 51 may be a cube, a cuboid or an ellipsoid, etc.; the first air inlet box 51 may be located at the bottom, top or side of the first air guide box 21. In one embodiment of the present application, the first air inlet box 51 is located at the top of the first air guide box 21.

[0088] Optionally, each first air guide box 21 may share a first air inlet box 51 connected to the air inlet 12, or each first air guide box 21 may have a first air inlet box 51 connected to the air inlet 12, which is not limited in this embodiment. Figure 2 In the illustrated embodiment, each first air guide box 21 shares a first air inlet box 51. The first air inlet box 51 is arranged crosswise with each first air guide box 21, and is connected to and internally communicated with each first air guide box 21. It should be noted that the interior of the first air inlet box 51 is not communicated with the interval 22 between the two first air guide boxes 21.

[0089] like Figure 2 As shown, along the second direction Y, the other end of the first air guide box 21 is provided with a return air box 4, and the return air opening 41 opens toward the side where the first air inlet box 51 is located.

[0090] In the embodiment of the present application, the first air inlet box 51 and the return air box 4 are respectively located at the two end positions in the extension direction of the first air guide box 21, which is conducive to the gas passing through the entire first air guide box 21 as much as possible, so that the workpiece 6 in the coating oven 100 can be blown and dried in the largest possible range.

[0091] In some embodiments, the blowing assembly 3 and the return air box 4 are respectively located on both sides of the first air guide box 21 along the third direction Z, and the blowing assembly 3 is located on the side along the third direction Z close to the conveying path of the workpiece 6.

[0092] like Figure 2 As shown, along the third direction Z, the blowing assembly 3 and the return air box 4 are respectively located on both sides of the first air guide box 21, and the blowing assembly 3 is located on the side close to the conveying path of the workpiece 6.

[0093] Optionally, the blowing assembly 3 may be directly welded to the first air guide box body 21 , may be fixed to the first air guide box body 21 with bolts, or may be integrated with the first air guide box body 21 .

[0094] Optionally, the return air box 4 can be directly welded to the first air guide box 21, or can be fixed to the first air guide box 21 by bolts, which is not limited in this embodiment. In some embodiments, the projection of the return air box 4 along the third direction Z on the imaginary projection plane perpendicular to the third direction Z has an overlapping portion with the projection of the interval 22 on the imaginary projection plane.

[0095] By arranging the blowing assembly 3, the first air guide box 21 and the return air box 4 in sequence along the third direction Z, it is beneficial for the gas to circulate in the coating oven 100 along the third direction Z, so as to fully utilize the gas to blow and dry the workpiece 6.

[0096] In some embodiments, the return air opening 41 is located on the side of the return air box 4, the width d1 of the return air opening 41 along the first direction X is greater than the width d2 of the interval 22 between adjacent first air guide boxes 21 along the first direction X, and the return air opening 41 spans the interval 22 along the first direction X.

[0097] like Figure 2 and Figure 5 As shown, the return air opening 41 is located on the side of the return air box 4 facing the first air inlet box 51 . Along the first direction X, the width d1 of the return air opening 41 is greater than the width d2 of the adjacent interval 22 , and the return air opening 41 spans the interval 22 .

[0098] Optionally, the area of ​​the return air opening 41 may occupy a portion of the area of ​​the side surface where it is located, or may occupy the entire area of ​​the side surface where it is located.

[0099] By making the width d1 of the return air opening 41 along the first direction X larger than the width d2 of the interval 22 between adjacent first air guide boxes 21 along the first direction X, and arranging it across the interval 22, the airflow passing through the interval 22 can be made to flow faster and more into the return air box 4, thereby increasing the flow rate of the airflow, further weakening the influence of the airflow on the surface of the workpiece 6, and making the workpiece 6 dry more uniformly.

[0100] In some embodiments, a plurality of air balancing plates 42 are provided in the return air box body 4, and the air balancing plates 42 extend from the return air opening 41 along the second direction Y toward the return air box body 4 and are arranged at intervals along the first direction X, and a plurality of return air gaps 44 are formed between the air balancing plates 42 and the side surfaces of the return air box body 4 and between adjacent air balancing plates 42 along the first direction X; a return air cavity 43 is provided on the side of the air balancing plate 42 away from the return air opening 41, and each return air gap 44 is connected to the air outlet 13 via the return air cavity 43.

[0101] like Figure 4 and Figure 5 As shown, a plurality of air equalizing plates 42 are provided in the return air box body 4. Along the second direction Y, the air equalizing plates 42 extend from the return air openings 41 toward the return air box body 4, and the air equalizing plates 42 are arranged at intervals along the first direction X. The gas flows through the return air gaps 44 formed between the air equalizing plates 42 and the side surfaces of the return air box body 4 and between the air equalizing plates 42, and then flows into the return air cavity 43, and finally flows out from the air outlet 13 connected to the return air cavity 43.

[0102] Optionally, the air balancing plate 42 may be plate-shaped or sheet-shaped; the air balancing plate 42 may be rectangular, square, polygonal, circular or irregular in shape; the surface of the air balancing plate 42 may be smooth, rough or have some protrusions. This embodiment does not limit this.

[0103] Optionally, the number of the air balancing plates 42 may be one, two, three, four, etc.; the air balancing plates 42 may be arranged in parallel with each other, may be arranged at equal intervals, or may be arranged at different intervals.

[0104] Optionally, the air balancing plate 42 can be welded to the return air box body 4, or a slide groove matching the air balancing plate 42 can be provided at the return air opening 41, and the air balancing plate 42 can be fixed in the return air box body 4 through the slide groove, which is not limited in this embodiment.

[0105] By arranging an air distribution plate 42 at the return air opening 41, the return air uniformity of the return air box 4 is improved, thereby reducing the impact of the gas on the surface of the workpiece 6, and the structure is simple, easy to install and easy to replace.

[0106] In some embodiments, the gap width of the return air gap 44 along the first direction X is in a range of 100 mm to 250 mm.

[0107] In some specific embodiments, the gap width of the return air gap 44 along the first direction X can be 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 240mm, 250mm, and of course it can also be other gap widths within the above range.

[0108] In a specific embodiment, 8 air balancing plates 42 are provided in the return air box 4. The length of each air balancing plate 42 along the second direction Y accounts for approximately half of the length of the return air box 4 along the second direction Y. Each air balancing plate 42 runs through the entire space in the return air box 4 along the third direction Z, and the upper end and the lower end of each air balancing plate 42 respectively abut against the upper cover and the lower bottom of the return air box 4. Along the first direction X, 8 return air gaps 44 are formed between the air balancing plates 42 and between the air balancing plates 42 and the two side walls of the return air box 4. The gap widths of each return air gap 44 along the first direction may be the same or different. In a specific example, starting from the side away from the air outlet 13, the gap widths of each return air gap 44 along the first direction are 190mm, 240mm, 210mm, 192mm, 168mm, 155mm, 148mm, and 130mm, respectively.

[0109] By setting the spacing distance between the air balancing plates 42 along the first direction X, the return air difference can be reduced, and the return air uniformity of the return air box 4 is further improved. In addition, by designing the number and gap width of the air balancing plates 42, the opening width of the return air opening 41 in the first direction X can cover the entire air guide box group 2, which helps to further increase the flow area of ​​the gas and improve the efficiency and drying consistency of the air drying.

[0110] In some embodiments, the blowing assembly 3 includes a plurality of first air nozzles 31 extending along the first direction X, the plurality of first air nozzles 31 are arranged at intervals along the second direction Y, and each first air nozzle 31 is connected to all the first air guide boxes 21 .

[0111] like Figure 2 and Figure 3 As shown, along the second direction Y, the blowing assembly 3 includes a plurality of first air nozzles 31 , and the first air nozzles 31 extend along the first direction X. The gas flows into the first air nozzles 31 from the first air guide box 21 , and then blows out from the first air nozzles 31 , so that the gas dries the surface of the workpiece 6 .

[0112] Optionally, the number of the first air nozzles 31 may be two, three, four, six, eight or ten, etc., which is not limited in the embodiments of the present application.

[0113] Optionally, the first air nozzles 31 may be arranged at equal intervals along the second direction Y, or may be arranged at unequal intervals along the second direction Y, which is not limited in the embodiments of the present application.

[0114] like Figure 6 As shown, the first air nozzle 31 has a first air outlet 311, which can be located on the bottom or side of the first air nozzle 31; the first air outlet 311 can be a circular opening, a square opening, or a long strip opening, etc. The embodiments of the present application are not limited to this.

[0115] This can improve the uniformity of the airflow on the surface of the workpiece 6 and improve the drying consistency.

[0116] In some embodiments, the air guide box group 2 also includes at least one second air guide box 23, and a second air inlet box 52 is provided at one end of the second air guide box 23 along the second direction Y, and the second air guide box 23 is connected to the air inlet 12 via the second air inlet box 52; along the third direction Z, the second air guide box 23 is located on the opposite side of the first air guide box 21 relative to the workpiece conveying path.

[0117] like Figure 2 As shown, along the third direction Z, the first air guide box 21 and the second air guide box 23 are arranged opposite to each other, and the first air guide box 21 and the second air guide box 23 are respectively located on both sides of the workpiece conveying path, and the gas flows out from the first air guide box 21 and the second air guide box 23 respectively, and the outflowing gas blows and dries both sides of the workpiece 6 respectively, and the gas after drying the workpiece 6 flows out of the outlet 13 through the return air box 4.

[0118] Optionally, the number of the second air guide box bodies 23 may be one, two, or three, etc., which is not limited in the embodiments of the present application.

[0119] Optionally, the second air inlet box 52 may be a cube, a cuboid, or an ellipsoid, etc.; the second air inlet box 52 may be located at the bottom, top, or side of the second air guide box 23. The embodiments of the present application are not limited to this. Figure 2 and Figure 3 In the illustrated embodiment, the second air inlet box 52 is located at the bottom of the second air guide box 23 .

[0120] By further providing the second air guide box 23, air drying can be performed from both sides of the workpiece 6. For the workpiece 6 that needs to be dried on both sides, the drying efficiency of the workpiece 6 is improved.

[0121] In some embodiments, the blowing assembly 3 further includes a plurality of second air nozzles 32 extending along the first direction X, the plurality of second air nozzles 32 are arranged at intervals along the second direction Y, and each second air nozzle 32 is connected to the second air guide box 23 .

[0122] Optionally, the number of the second air nozzles 32 may be two, three, four, six, eight or ten, etc., which is not limited in the embodiments of the present application.

[0123] Optionally, the second air nozzles 32 may be arranged at equal intervals along the second direction Y, or may be arranged at unequal intervals along the second direction Y, which is not limited in the embodiments of the present application. The first air nozzle 31 and the second air nozzle 32 may be arranged opposite to each other along the third direction Z, or may be arranged staggered with each other.

[0124] Optionally, the second air nozzle 32 has a second air outlet, which may be located on the top surface or side surface of the second air nozzle 32; the second air outlet may be a circular opening, a square opening, or a long strip opening, etc. The embodiments of the present application are not limited to this.

[0125] This can improve the uniformity of the gas on the surface of the workpiece 6 and improve the drying consistency.

[0126] In some embodiments, the flow area of ​​each first air guide box 21 gradually decreases as it moves away from the first air inlet box 51 along the second direction Y.

[0127] like Figure 2 and Figure 3 As shown, along the second direction Y, the flow area of ​​each first air guide box 21 gradually decreases as it moves away from the first air inlet box 51. When the gas flows in the first air guide box 21, the kinetic energy of the gas will gradually dissipate as the gas moves away from the first air inlet box 51 along the second direction Y, resulting in a decrease in the wind speed away from the first air inlet box 51 along the second direction Y. By controlling the flow area of ​​the first air guide box 21 at different positions along the second direction Y, the wind speed blown into the cavity 11 is made more uniform.

[0128] For the convenience of description, the following embodiments are Figure 3 The description is made in the direction shown, optionally, the upper inner wall of the first air guide box 21 is inclined downward in the direction away from the first air inlet box 51, and the lower inner wall of the first air guide box 21 is inclined upward in the direction away from the first air inlet box 51, thereby, as the air is away from the first air inlet box 51 along the second direction Y, the cross-sectional area of ​​the ventilation passage in the first air guide box 21 gradually decreases. Also optionally, the upper inner wall of the first air guide box 21 is inclined downward in the direction away from the first air inlet box 51, and the lower inner wall of the first air guide box 21 is substantially parallel to the second direction Y, thereby, as the air is away from the first air inlet box 51 along the second direction Y, the cross-sectional area of ​​the ventilation passage in the first air guide box 21 gradually decreases.

[0129] This is beneficial to improving the uniformity of the gas flow rate, helping to improve the uniformity of the gas pressure on the surface of the workpiece 6, and improving the transportation stability of the workpiece 6.

[0130] In some embodiments, the flow area of ​​the second air guide box 23 gradually decreases as it moves away from the second air inlet box 52 along the second direction Y.

[0131] like Figure 2 and Figure 3 As shown, along the second direction Y, the flow area of ​​each second air guide box 23 gradually decreases as it moves away from the second air inlet box 52. When the gas flows in the second air guide box 23, the kinetic energy of the gas will gradually dissipate as the gas moves away from the second air inlet box 52 along the second direction Y, resulting in a decrease in the wind speed away from the second air inlet box 52 along the second direction Y. By controlling the flow area of ​​the second air guide box 23 at different positions along the second direction Y, the wind speed blown into the cavity 11 is made more uniform.

[0132] For the convenience of description, the following embodiments are Figure 3 The second air guide box 23 is described in the direction shown, optionally, the upper inner wall of the second air guide box 23 is inclined downward in the direction away from the second air inlet box 52, and the lower inner wall of the second air guide box 23 is inclined upward in the direction away from the second air inlet box 52, thereby, as the second air inlet box 52 is away from the second air inlet box 52 along the second direction Y, the cross-sectional area of ​​the ventilation passage in the second air guide box 23 gradually decreases. Also optionally, the upper inner wall of the second air guide box 23 is substantially parallel to the second direction Y, and the lower inner wall of the second air guide box 23 is inclined upward in the direction away from the second air inlet box 52, thereby, as the second air inlet box 52 is away from the second direction Y, the cross-sectional area of ​​the ventilation passage in the second air guide box 23 gradually decreases.

[0133] This is beneficial to improving the uniformity of the gas flow rate, helping to improve the uniformity of the gas pressure on the surface of the workpiece 6, and improving the transportation stability of the workpiece 6.

[0134] In some embodiments, the coating oven 100 further includes a heat exchange filter device 7 , the air outlet 13 is in communication with the heat exchange filter device 7 , and the heat exchange filter device 7 is in communication with the air inlet 12 .

[0135] like Figure 7 As shown, the coating oven 100 includes a heat exchange filter device 7, an air outlet 13 connected to the heat exchange filter device 7, and the heat exchange filter device 7 is connected to the air inlet 12. The gas that has completed drying the workpiece 6 is blown out from the air outlet 13 and flows into the heat exchange filter device 7. The gas is filtered by the heat exchange filter device 7 and supplemented with appropriate heat, and then flows into the air inlet 12, so as to be used to dry the workpiece 6, thereby realizing the internal circulation of the hot gas.

[0136] The heat exchange and filtering device 7 can be an integrated device integrating heat exchange and filtering functions; it can also be a heat exchange device and a filtering device set separately, which can mainly realize heat exchange and filtering functions, and the embodiments of the present application do not limit this.

[0137] Optionally, the gas blown out from the air outlet 13 can be directly discharged after being processed; a portion of the gas blown out from the air outlet 13 can be processed by the heat exchange filter device 7 and then re-introduced into the air inlet 12; all of the gas blown out from the air outlet 13 can be processed by the heat exchange filter device 7 and then re-introduced into the air inlet 12. The embodiments of the present application are not limited to this. A fresh air intake device for introducing fresh air from the outside can also be connected to the upstream side of the heat exchange filter device 7.

[0138] By providing the heat exchange and filtering device 7, the gas used to dry the workpiece 6 can be recycled, thereby reducing energy loss and adverse effects on the environment.

[0139] In some embodiments, the workpiece 6 to be dried is a sheet including a slurry layer for forming an electrode.

[0140] Optionally, the sheet material may be a positive electrode sheet or a negative electrode sheet, which is not limited in the embodiments of the present application.

[0141] This allows the sheet including the electrode-forming slurry layer to be dried satisfactorily, thereby contributing to improved manufacturing quality of the battery.

[0142] A second aspect of the present application provides a coating device 1000 , which includes a workpiece conveying device 200 and the coating oven 100 as described above. The workpiece conveying device 200 is used to allow a workpiece 6 to be dried to pass through a workpiece conveying path in the coating oven 100 .

[0143] like Figure 7As shown, the coating equipment 1000 includes the coating oven 100 as described above, and the coating equipment 1000 may also include a workpiece conveying device 200, which conveys the workpiece 6 to be dried into the coating oven 100, conveys the workpiece 6 that has been dried out of the coating oven 100, and can also move the workpiece 6 in the coating oven 100.

[0144] Optionally, the workpiece conveying device 200 may include a conveyor belt, a roller or / and a conveying roller, etc.; the workpiece conveying device 200 may also include a driving motor, which is used to drive the conveyor belt, the roller or / and the conveying roller to rotate, thereby allowing the workpiece 6 to enter and exit the coating oven 100 and move in the coating oven 100. The embodiments of the present application are not limited to this.

[0145] Continuous drying can thereby be achieved.

[0146] A specific embodiment of the present application is described below.

[0147] like Figures 1 to 5 As shown, the overall structure of the coating oven 100 includes a box body 1, the box body 1 has an air inlet 12 and an air outlet 13, a cavity 11 is formed inside the box body 1, and two first air guide boxes 21, a plurality of first air nozzles 31, a return air box body 4 and a first air inlet box body 51 are located in the cavity 11. The workpiece inlet 141 is used for the workpiece 6 to enter the box body 1, and the workpiece outlet 142 is used for the workpiece 6 to exit the box body 1. The workpiece inlet 141 and the workpiece outlet 142 are respectively located on two opposite sides of the box body 1.

[0148] The air inlet 12 is connected to the first air inlet box 51, the first air inlet box 51 is connected to the first air guide box 21, all the first air guide boxes 21 are connected to a plurality of first air nozzles 31 extending along the first direction X and spaced along the second direction Y, all the first air nozzles 31 are connected to the cavity 11, the cavity 11 is connected to the return air box 4, the return air box 4 is connected to the air outlet 13, the gas flows from the air inlet 12 into the first air inlet box 51, then flows into the first air guide box 21, and then flows out from the first air nozzle 31, blowing air to the workpiece 6 to be dried passing through the workpiece conveying path, the gas in the cavity 11 flows into the return air box 4 via the two sides of the first air inlet box 51 and the return air passages between each other, and then flows out from the air outlet 13. Sometimes, the two first air guide boxes 21 are also called double hulls, and the total width of the double hull in the first direction X can be wider than the width of a single hull in the first direction X.

[0149] The return air box 4 and all the first air nozzles 31 are respectively located on both sides of the first air guide box 21 along the third direction Z, and the first air nozzle 31 is located on the side close to the workpiece conveying path along the third direction Z. The first air inlet box 51 and the return air box 4 are located at both ends of the first air guide box 21 along the second direction Y. There are two first air guide boxes 21, and the first air guide boxes 21 are arranged in parallel and spaced apart along the first direction X. The first air guide boxes 21 extend along the second direction Y. The first air guide boxes 21 are located on the same side of the workpiece conveying path along the third direction Z. The flow area of ​​the first air guide box 21 gradually decreases as it moves away from the first air inlet box 51 along the second direction Y. The height of the first air guide box 21 (the height of the top surface of the first air guide box 21 from the bottom of the oven) also gradually decreases as it moves away from the first air inlet box 51 along the second direction Y.

[0150] The return air opening 41 is located on the side of the return air box 4, and the width d1 of the return air opening 41 along the first direction X is greater than the width d2 of the interval 22 between the adjacent first air guide boxes 21 along the first direction X, and the return air opening 41 spans the interval 22 along the first direction X. A plurality of air equalizing plates 42 are arranged in the return air box 4, and the air equalizing plates 42 extend from the return air opening 41 along the second direction Y toward the return air box 4 and are arranged at intervals along the first direction X, and a plurality of return air gaps 44 are formed between the air equalizing plates 42 and the side of the return air box 4 and between the adjacent air equalizing plates 42 along the first direction X; a return air cavity 43 is arranged on the side of the air equalizing plate 42 away from the return air opening 41, and the return air gap 44 is connected to the air outlet 13 via the return air cavity 43. Starting from the side away from the air outlet 13, the gap widths of each return air gap 44 along the first direction X are 190 mm, 240 mm, 210 mm, 192 mm, 168 mm, 155 mm, 148 mm, and 130 mm, respectively.

[0151] Since there is a gap 22 between adjacent first air guide boxes 21 and the gap 22 is connected to the return air opening 41, the gas blown out of the first air nozzle 31 into the coating oven 100 can flow into the return air box 4 through the space on both sides of each first air guide box 21 along the first direction X, including the gap 22 between the first air guide boxes 21. Compared with the conventional case of only one air guide box, the hot air flow area is increased, the gas unevenness on the surface of the workpiece 6 is reduced, and the drying consistency of the workpiece 6 is improved. In addition, the pressure of the gas on the surface of the workpiece 6 becomes more balanced, the movement of the workpiece in the workpiece conveying path is more stable, and it is also helpful to improve the drying consistency of the workpiece 6 as a whole. The overall structure of this solution is simple, maintenance is convenient, and cost is reduced.

[0152] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein.

Claims

1. A coating oven, characterized in that: include: A box body having a cavity, an air inlet and an air outlet; An air guide box group is located in the cavity and is connected to the air inlet; An air blowing assembly is located in the cavity and is in communication with the air guide box assembly, and the air blowing assembly is used to blow air to the workpiece to be dried passing through the workpiece conveying path; The return air box is located in the cavity and is connected to the air outlet. The return air box has a return air opening. The air guide box group includes at least two first air guide boxes, which are arranged at intervals along the first direction and extend respectively along the second direction, and the first air guide boxes are located on the same side of the workpiece conveying path along the third direction, and the spaces on both sides of each of the first air guide boxes along the first direction are connected to the return air opening, the first direction, the second direction and the third direction intersect with each other, and the conveying path for the workpiece to be dried extends along the second direction.

2. The coating oven according to claim 1, characterized in that: A first air inlet box is provided at one end of the first air guide box in the second direction, and each of the first air guide boxes is connected to the air inlet via the first air inlet box; The return air box is provided at the other end of the first air guide box in the second direction, and the return air opening opens along the second direction toward the side where the first air inlet box is located.

3. The coating oven according to claim 2, characterized in that: The blowing assembly and the return air box are respectively located on two sides of the first air guide box along the third direction, and the blowing assembly is located on one side close to the workpiece conveying path along the third direction.

4. The coating oven according to claim 2, characterized in that: The return air opening is located on a side of the return air box body, the width of the return air opening along the first direction is greater than the width of the interval between adjacent first air guide boxes along the first direction, and the return air opening spans the interval along the first direction.

5. The coating oven according to claim 4, characterized in that: A plurality of air balancing plates are provided in the return air box body, the air balancing plates extend from the return air opening along the second direction toward the return air box body and are arranged at intervals along the first direction, and a plurality of return air gaps are formed between the air balancing plates and the side surfaces of the return air box body and between the adjacent air balancing plates along the first direction; A return air cavity is arranged on a side of the air balancing plate away from the return air opening, and each of the return air gaps is communicated with the air outlet via the return air cavity.

6. The coating oven according to claim 5, characterized in that: A gap width of the return air gap along the first direction is in a range of 100 mm to 250 mm.

7. The coating oven according to any one of claims 1 to 6, characterized in that The blowing assembly includes a plurality of first air nozzles extending along the first direction, and the plurality of first air nozzles are arranged at intervals along the second direction. Each of the first air nozzles is connected to all of the first air guide boxes.

8. The coating oven according to any one of claims 1 to 6, characterized in that The air guide box group further includes at least one second air guide box, one end of the second air guide box in the second direction of which is provided with a second air inlet box, and the second air guide box is connected to the air inlet via the second air inlet box; Along the third direction, the second air guide box is located on a side opposite to the first air guide box relative to the workpiece conveying path.

9. The coating oven according to claim 8, characterized in that: The blowing assembly includes a plurality of second air nozzles extending along the first direction, and the plurality of second air nozzles are arranged at intervals along the second direction. Each of the second air nozzles is communicated with the second air guide box.

10. The coating oven according to any one of claims 2 to 6, characterized in that The flow area of ​​each of the first air guide boxes gradually decreases as it moves away from the first air inlet box along the second direction.

11. The coating oven according to claim 8, characterized in that: The flow area of ​​the second air guide box gradually decreases as it moves away from the second air inlet box along the second direction.

12. The coating oven according to any one of claims 1 to 6, characterized in that The coating oven further comprises a heat exchange filtering device, the air outlet is communicated with the heat exchange filtering device, and the heat exchange filtering device is communicated with the air inlet.

13. The coating oven according to any one of claims 1 to 6, characterized in that The workpiece to be dried is a sheet material including a slurry layer for electrode formation.

14. A coating device, characterized in that: The coating equipment comprises a workpiece conveying device and the coating oven according to any one of claims 1 to 13, wherein the workpiece conveying device is used to allow the workpiece to be dried to pass through the workpiece conveying path in the coating oven.

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