Drying oven and coating drying equipment

Abstract

The invention provides a drying oven and coating drying equipment, and belongs to the technical field of batteries. The drying oven comprises an oven body, an infrared heating assembly and an air supply chamber, and the oven body is provided with an air inlet and an air outlet; the infrared heating assembly is arranged in the box body and used for emitting infrared rays so as to heat a to-be-dried pole piece conveyed into the box body in the pole piece conveying direction; the air supply chamber is arranged in the box body, the air supply chamber is communicated with the air inlet, the air supply chamber comprises a first sub-air chamber, a second sub-air chamber and a communicating chamber for communicating the first sub-air chamber with the second sub-air chamber, the air supply chamber is provided with an air blowing part for facing a to-be-dried pole piece, and the air blowing part is arranged in at least one of the first sub-air chamber and the second sub-air chamber; the air inlet is used for conveying air flow into the air supply chamber so that the air flow can be blown to the to-be-dried pole piece through the air blowing part and flow out of the box body through the air outlet. According to the drying oven, heat can directly act on slurry on the pole piece to be dried through the infrared heating assembly, and the drying efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to an oven and a coating drying device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is an important factor related to their development.

[0003] With the development of battery technology, the performance requirements for battery production equipment have also been gradually improved. In related technologies, the electrode sheet is formed by coating an active material on a sheet and drying it through a coating dryer. How to improve the drying efficiency of the coating dryer is of great significance to the production efficiency of batteries. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the background art. For this purpose, an object of the present application is to provide an oven and a coating drying device to improve the problem of low drying efficiency of the coating dryer in related technologies.

[0005] An embodiment of the first aspect of the present application provides an oven, including: a box body, an infrared heating component, and a blowing chamber. The box body has an air inlet and an air outlet; the infrared heating component is arranged inside the box body, and the infrared heating component is used to emit infrared rays to heat the electrode sheet to be dried conveyed into the box along the conveying direction of the electrode sheet; the blowing chamber is arranged inside the box body, and the blowing chamber is communicated with the air inlet. The blowing chamber includes a first sub-chamber, a second sub-chamber, and a communication chamber connecting the first sub-chamber and the second sub-chamber. The blowing chamber is provided with a blowing part for blowing towards the electrode sheet to be dried, and the blowing part is arranged in at least one of the first sub-chamber and the second sub-chamber; the air inlet is used to convey air flow into the blowing chamber, so that the air flow can blow towards the electrode sheet to be dried through the blowing part and leave the box body through the air outlet.

[0006] In the technical solution of the embodiment of the present application, the electrode sheet to be dried is dried through the infrared heating component. Compared with the circulating hot air heating in related technologies, the heating method is changed from heat convection to heat radiation. The heat can directly act on the active material (slurry) on the electrode sheet to be dried, heat deeply inside, with high energy utilization rate and high drying efficiency. And because of the high energy utilization rate, the heating temperature of the infrared heating component can reach the temperature required for drying (for example, 150°C to 160°C), without the need to rely on the heat of the circulating air in related technologies to ensure the drying efficiency and maintain the temperature inside the box. Thus, the amount of air required inside the box can be reduced, and there is no need to heat the air flow through a heat transfer oil heating package. Only the infrared heating component and the normal-temperature air flow can achieve an efficient drying effect, thereby greatly reducing energy consumption.

[0007] In some embodiments, the infrared heating assembly includes a plurality of heating elements arranged at intervals along the pole piece conveying direction. The heating elements extend along a first direction perpendicular to the pole piece conveying direction, and each heating element has a heating surface facing the pole piece to be dried, and the heating surface is used to emit infrared rays.

[0008] In this embodiment, by providing a plurality of heating elements, the heating elements can generally cover the pole piece to be dried along the pole piece conveying direction, thereby increasing the heating area and the drying efficiency. In addition, the heating element has a heating surface facing the pole piece to be dried, and the two are arranged opposite to each other, so that the infrared rays emitted by the heating surface can directly act on the pole piece to be dried, resulting in high drying efficiency. Moreover, since the pole piece to be dried is also generally flat, by radiating heat through the heating surface, the radiation received by the pole piece to be dried is relatively uniform, which can improve problems such as wrinkling or cracking caused by uneven heating.

[0009] In some embodiments, a bracket is provided in the box body, the heating element is connected to the bracket, and the heating element can move relative to the bracket along a second direction to adjust the distance between the heating element and the pole piece to be dried; wherein, the first direction, the pole piece conveying direction, and the second direction are perpendicular to each other pairwise.

[0010] In this embodiment, by adjusting the height of the heating element in the second direction, the distance between the heating element and the pole piece to be dried can be adjusted, and thus different coating thicknesses of the active material can be adapted, that is, the oven can be used for pole pieces to be dried with various thicknesses, improving the versatility of the oven.

[0011] In some embodiments, the heating element includes a base body connected in the box body and a heating layer provided on one side of the base body, and the surface of the heating layer facing away from the base body constitutes the heating surface.

[0012] In this embodiment, by providing the base body and the heating layer, the structure of the heating element can be simplified, and at the same time, by using the infrared rays emitted by the heating layer, the energy consumption can be greatly reduced while maintaining the drying effect.

[0013] In some embodiments, the minimum distance L1 between two adjacent heating elements in the pole piece conveying direction satisfies: 100mm ≤ L1 ≤ 200mm.

[0014] In this embodiment, by setting the maximum value of L1 to 200mm, the distance between two adjacent heating elements can be prevented from being too large, so that the surface of the pole piece to be dried can be covered as much as possible, thereby improving the drying efficiency. In addition, the minimum value of the size of L1 is 100mm, which can reserve a certain space for the installation of the blowing part, facilitating the installation of the blowing part, and at the same time, the cost can be reduced.

[0015] In some embodiments, the distance between the heating surface of the heating element and the electrode sheet to be dried in the second direction satisfies: 10 mm ≤ L2 ≤ 15 mm. Among them, the first direction, the electrode sheet conveying direction, and the second direction are perpendicular to each other in pairs.

[0016] In this embodiment, by setting the maximum value of L2 to 15 mm, the heating element can be prevented from being too far away from the electrode sheet to be dried, thereby improving the utilization rate of thermal energy and the drying efficiency. In addition, the minimum value of the size of L2 is 10 mm, which can prevent the distance between the heating element and the electrode sheet to be dried from being too close, so that the electrode sheet to be dried can be heated more evenly, and the problem of cracking of the active material layer will not occur, and the drying effect is better.

[0017] In some embodiments, the air supply chamber has a first bottom wall facing the electrode sheet to be dried, and the infrared heating assembly is connected to the outer surface of the first bottom wall facing away from the air supply chamber.

[0018] In this embodiment, by arranging the infrared heating assembly on the first bottom wall, the infrared heating assembly can be close to the electrode sheet to be dried, so that the infrared rays emitted by the infrared heating assembly can directly act on the electrode sheet to be dried, shortening the radiation path between the two, which is beneficial to improving the drying efficiency.

[0019] In some embodiments, the blowing part is connected to the first bottom wall of the air supply chamber facing the electrode sheet to be dried. The blowing part includes a plurality of air nozzles arranged at intervals along the electrode sheet conveying direction. The air nozzles extend along the first direction perpendicular to the electrode sheet conveying direction, and a heating element is arranged between two adjacent air nozzles.

[0020] In this embodiment, the blowing part is close to the electrode sheet to be dried, so that the air flow blown out can first pass through the surface of the electrode sheet to be dried, and the air flow is relatively concentrated, so that water vapor and other gases can be quickly carried away, further improving the drying efficiency. By arranging a plurality of air nozzles, the air can be discharged more evenly, the electrode sheet to be dried is subjected to uniform and stable force, the probability of jitter is small, and the coating stability is high. In addition, by alternately arranging the air nozzles and the heating elements, the air flow can be more evenly distributed at each position of the electrode sheet to be dried, so that water vapor can be taken away in time and the drying effect can be improved.

[0021] In some embodiments, the air nozzle includes a first section connected to the first bottom wall and a second section connected to the first section away from the first bottom wall; the first section is communicated with the air supply chamber through a plurality of first through holes, the second section is communicated with the first section through a plurality of second through holes, and the end of the second section away from the first section has a holding section. The through-flow area of the holding section is equal everywhere, and the through-flow area S1 of the holding section and the through-flow area S2 of the end of the second section close to the first section satisfy: S1 < S2.

[0022] In this embodiment, through a plurality of first through-holes and a plurality of second through-holes, the air flow can be made to flow more stably from the air supply chamber, through the first section and into the second section. At the same time, by setting S1 greater than S2 and S1 being equal everywhere, the flow area of the air flow can be gradually reduced, so that the air flow can be blown out at a relatively stable speed.

[0023] In some embodiments, a folding section parallel to the first bottom wall is further provided at one end of the holding section facing away from the first section, and the folding is provided on both sides of the holding section along the pole piece conveying direction.

[0024] In this embodiment, the folding section can play a role in converging the air flow, so that the air blown out from the holding section can be blown towards the pole piece to be dried as much as possible, thereby minimizing the movement of the air flow along the second direction away from the pole piece to be dried, and thus improving the drying efficiency. At the same time, since the pole piece to be dried may vibrate during the conveying process, the folding section can provide a relatively large plane, which can contact this plane when the pole piece to be dried vibrates. Compared with the pole piece to be dried directly contacting the relatively small air nozzle opening, the folding section can reduce the damage to the active material layer and contribute to improving the processing quality of the pole piece.

[0025] In some embodiments, the distance L3 between two adjacent air nozzles in the pole piece conveying direction satisfies: 400mm ≤ L3 ≤ 500mm.

[0026] In this embodiment, by setting the minimum value of L3 to 400mm, the distance between the air nozzles will not be too small, so that there is enough space between the air nozzles to set the heating element, and the size of the heating surface can meet the drying effect of the pole piece to be dried. With the maximum value of L3 being 500mm, the distance between the air nozzles will not be too large, and the water vapor can be taken away by the air flow in time, so that a good drying effect can be achieved.

[0027] In some embodiments, the air outlet direction of the air nozzle is parallel to the second direction; or, the air outlet direction of the air nozzle is inclined relative to the second direction; wherein, the first direction, the pole piece conveying direction, and the second direction are perpendicular to each other pairwise.

[0028] In this embodiment, by making the air outlet direction of the air nozzle parallel to the second direction, the air flow can be made to be approximately perpendicular to the pole piece to be dried, and the air flow can directly act on the surface of the pole piece to be dried, thereby quickly taking away the water vapor and improving the drying efficiency. In addition, by setting the air outlet direction of the air nozzle to be inclined relative to the second direction, the air nozzle has a guiding effect, so that when the air flow blows towards the pole piece to be dried, it can also have a component along the pole piece conveying direction, thereby promoting the air flow inside the box, contributing to the circulation of the air inside and outside the box, and keeping the inside of the box dry.

[0029] In some embodiments, the oven further includes a conveying assembly. The conveying assembly includes a plurality of over-rollers spaced along the conveying direction of the electrode sheet. The over-rollers extend in a first direction and are used to carry and convey the electrode sheet to be dried. And each air nozzle is arranged corresponding to one over-roller in a second direction. Wherein, the first direction, the conveying direction of the electrode sheet, and the second direction are perpendicular to each other pairwise.

[0030] In this embodiment, since the air from the air nozzle blows downward relatively concentratedly, by corresponding the air nozzle with the over-roller, it is possible to avoid problems such as the electrode sheet to be dried being bent due to the air flow blowing, and improve the drying effect.

[0031] In some embodiments, among the plurality of air nozzles, the first distance between each air nozzle and the corresponding over-roller in the second direction is equal.

[0032] In this embodiment, by making the first distance between each over-roller and the corresponding air nozzle equal, the distance between the air nozzle and the electrode sheet to be dried can be kept consistent, so that the air flow can uniformly carry away gases such as water vapor on the surface of the electrode sheet to be dried, and the drying effect is more uniform.

[0033] In some embodiments, the box body has a second bottom wall perpendicular to the second direction. The conveying assembly is located between the second bottom wall and the air supply chamber, and the second distance between the plurality of over-rollers and the second bottom wall gradually decreases from the middle to both ends along the conveying direction of the electrode sheet.

[0034] In this embodiment, by making the heights of the plurality of over-rollers different, the wrap angle between the electrode sheet to be dried and the over-rollers can be increased, thereby increasing the contact area and improving the conveying effect of the electrode sheet to be dried. Since the electrode sheet to be dried can pass through the box body relatively uniformly and will not stay, by increasing the wrap angle between it and the over-rollers, the conveying effect can be further improved, preventing the electrode sheet to be dried from slipping and improving the processing efficiency of the electrode sheet.

[0035] In some embodiments, both the first sub-air chamber and the second sub-air chamber extend along the conveying direction of the electrode sheet, and the first sub-air chamber and the second sub-air chamber are spaced in a first direction perpendicular to the conveying direction of the electrode sheet. One end of the first sub-air chamber facing away from the second sub-air chamber is communicated with the air inlet. The first sub-air chamber has a third bottom wall facing the electrode sheet to be dried, and the second sub-air chamber has a fourth bottom wall facing the electrode sheet to be dried. The blowing part is arranged on the third bottom wall and the fourth bottom wall.

[0036] In this embodiment, by providing the first sub-air chamber and the second sub-air chamber arranged at intervals, the space for air return can be increased, which is beneficial to the timely discharge of air, can avoid the formation of condensed water in the box body, and improves the drying effect.

[0037] In some embodiments, the air inlet communicates with a first end of the first sub-air chamber in a third direction parallel to the polar plate conveying direction. The communication chamber extends in a first direction, one end of the communication chamber communicates with the first end of the first sub-air chamber, and the other end of the communication chamber communicates with a first end of the second sub-air chamber in the third direction; and in the third direction, the flow-through area of the first sub-air chamber decreases from the end close to the communication chamber to the end away from the communication chamber, and the flow-through area of the second sub-air chamber decreases from the end close to the communication chamber to the end away from the communication chamber.

[0038] In this embodiment, since the air flow is generally conveyed from left to right along the polar plate conveying direction to each air nozzle, the air flow path to the rightmost air nozzle is the longest. By setting the flow-through area at this position to be smaller, the wind speed can be increased, so that the wind speeds of the air flows blown out by each air nozzle are approximately the same, making the air flow blown out by the blowing part more uniform.

[0039] In some embodiments, the air flow blown by the blowing part towards the polar plate to be dried can flow towards the air outlet through the gap between the inner wall of the box body and the air supply chamber.

[0040] In this embodiment, the interval between the inner wall of the box body and the air supply chamber is used for exhausting air. After the air flow blows towards the polar plate to be dried, it can flow towards the air outlet through the gap between the side wall of the box body and the air supply chamber and the interval between the bottom wall of the box body and the air supply chamber. There is no need to additionally set an exhaust channel, which simplifies the air path structure. Moreover, it can promote the air circulation in the box body and maintain a dry environment in the box body.

[0041] In some embodiments, the temperature T1 of the air flow at the air inlet satisfies: 20°C ≤ T1 ≤ 30°C.

[0042] In this embodiment, by setting the temperature range of T1, T1 can be a normal temperature, and the air flow can play a role in taking away water vapor and other gases without bearing the heating function. Thus, the heat transfer oil heating pack in the related art can be cancelled, reducing the energy consumption and the volume of the equipment.

[0043] In some embodiments, the box body has a feed port and a discharge port oppositely arranged along the polar plate conveying direction. The feed port is used to allow the polar plate to be dried to enter the box body, and the discharge port is used to allow the polar plate to be dried after being heated by the infrared heating component to leave the box body; a temperature sensor is further arranged in the box body, and the temperature sensor is arranged at a position of the box body close to the discharge port. The temperature sensor is used to detect the temperature of the polar plate to be dried at the discharge port, and the temperature is used to adjust the heating power of the infrared heating component.

[0044] In this embodiment, by arranging a temperature sensor at the discharge port, the heating power of the infrared heating assembly can be adjusted in real time according to the temperature measured by the temperature sensor, realizing temperature closed-loop control, so that the drying degree can be adjusted in time and the drying effect can be improved. Moreover, arranging a temperature sensor at the discharge port can determine in time the temperature of the part of the to-be-dried electrode sheet about to leave the box body, thereby understanding its drying effect in time, making the adjustment of the heating power more targeted and the adjustment effect better.

[0045] In some embodiments, a humidity sensor is arranged in the box body. The humidity sensor is arranged at a position in the box body close to the air outlet. The humidity sensor is used to detect the humidity of the air flow at the air outlet, and the humidity is used to adjust the air volume of the air flow.

[0046] In this embodiment, by arranging a humidity sensor at the air outlet, the air volume can be adjusted in real time according to the humidity measured by the humidity sensor, so as to keep the inside of the box body dry and avoid the formation of condensed water. Moreover, arranging a humidity sensor at the air outlet can immediately determine the humidity of the air flow about to leave the box body. It can be understood that the humidity of the air flow about to leave the box body can represent the maximum humidity inside the box body. Therefore, by measuring the humidity at the air outlet, the maximum humidity inside the box body can be made not to exceed the preset humidity, thus better maintaining the dryness inside the box body.

[0047] In some embodiments, a coating drying device is further provided, which includes a plurality of ovens in any of the above embodiments, and the plurality of ovens are sequentially connected along the electrode sheet conveying direction of the to-be-dried electrode sheet.

[0048] In this embodiment, since it has the oven in any of the above embodiments, the coating drying device also has the advantages of the oven. In addition, after canceling the heat-conducting oil heating package and the circulation pipeline, the coating drying device including this oven can be compressed in the width direction (the first direction), and because the drying efficiency is improved, the volatilization efficiency of steam and other gases is improved, and the device can be compressed in the length direction (the electrode sheet conveying direction). Therefore, the space occupied by the whole device can be greatly reduced, and the manufacturing cost of the device can be reduced.

[0049] In some embodiments, the coating drying device further includes: the heat exchanger has a first channel and a second channel that are isolated from each other. The first channel is communicated with the air inlet of the oven, and the second channel is communicated with the air outlet of the oven. The heat exchanger is used to exchange heat between the air flow in the first channel and the air flow in the second channel.

[0050] In this embodiment, through the heat exchanger, the inlet air temperature can be increased, so that more water vapor can be taken away, the drying effect is better, and the temperature of the box body can be increased, which can reduce the formation of condensed water. In addition, the outlet air temperature can be reduced. Even if there is a problem with the negative pressure of the box body, resulting in air leakage to the outside of the box body, since the temperature of the air flow is relatively low, it will not scald the on-site personnel, improving production safety.

[0051] In some embodiments, the coating drying equipment further includes a total inlet air duct and a total outlet air duct; the total inlet air duct extends along the direction of the electrode sheet conveyance, and the air inlet of the oven is communicated with the total inlet air duct, the total outlet air duct extends along the direction of the electrode sheet conveyance, and the air outlet of the oven is communicated with the total outlet air duct, and the total inlet air duct and the total outlet air duct are arranged in a direction perpendicular to the electrode sheet to be dried.

[0052] In this embodiment, by arranging the total inlet air duct and the total outlet air duct vertically, the floor space occupied by the equipment can be reduced, and the volume of the equipment can be reduced.

[0053] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. Brief Description of the Drawings

[0054] In the drawings, unless otherwise specified, the same reference numerals throughout the drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application, and should not be regarded as limiting the scope of the present application.

[0055] Figure 1 It is a cross-sectional view of the oven according to an embodiment of the present application; Figure 2 is Figure 1 a partial enlarged schematic view of the mid-infrared heating component and the blowing part; Figure 3 is Figure 2 the front view of the air nozzle in Figure 4 is Figure 2 the top view of the air nozzle in Figure 5 is Figure 2 the side view of the air nozzle in Figure 6 is Figure 3 the cross-sectional view at A-A in Figure 7 It is a partial enlarged schematic view of the infrared heating component and the blowing part according to another embodiment of the present application; Figure 8 isFigure 1 Schematic diagram of the structure of the middle air supply chamber; Figure 9 Schematic diagram of the structure of the coating and drying equipment according to the embodiment of the present application; Figure 10 is Figure 9 Schematic diagram of the structure of the heat exchanger in the middle.

[0056] Description of the reference numerals: Oven 10, the electrode sheet to be dried 20, heat exchanger 30, first channel 31, second channel 32, total air inlet pipe 40, total air outlet pipe 50, fan 60; Box body 100, air inlet 110, air outlet 120, second bottom wall 130, feeding port 140, discharging port 150, temperature sensor 160, humidity sensor 170; Infrared heating assembly 200, heating element 210, substrate 211, heating layer 212, heating surface 220, bracket 230, Air supply chamber 300, first sub-air chamber 310, third bottom wall 311, second sub-air chamber 320, fourth bottom wall 321, communication chamber 330, first bottom wall 340; Blowing part 400, air nozzle 410, first section 411, second section 412, holding section 413, folding section 414, first through hole 420, second through hole 430; Transportation assembly 500, passing roller 510. Detailed implementation manners

[0057] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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 the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0060] Reference to "embodiments" in this specification means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, a and / or b can represent: a exists alone, a and b exist simultaneously, and b exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0062] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of 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, and therefore should not be construed as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also 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 internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0065] At present, from the perspective of the development of the market situation, rechargeable batteries are more and more widely used. Rechargeable batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in various electronic devices, such as electric bicycles, electric motorcycles, electric vehicles and other electric transportation tools, as well as military equipment and aerospace and other fields. With the continuous expansion of the application fields of rechargeable batteries, the market demand is also constantly increasing.

[0066] In the related art, as a manufacturing device for the electrode plate of a rechargeable battery, a coating and drying machine includes a coating device and an oven device. The coating device can coat the active material on the sheet of the electrode plate, and then send it into the oven device for heating. The oven device can remove the moisture in the active material, so as to obtain a dry and stable electrode plate.

[0067] The oven device in the related art uses a hot air circulation heating system to dry the active material. Specifically, the oven device includes an oven body. A heat transfer oil heating package is arranged at the air inlet of the oven body. A circulation pipeline is also arranged between the air outlet and the air inlet of the oven body. The circulation pipeline is located outside the oven body. The cold air is heated by the heat transfer oil heating package to form hot air. The hot air is sent into the oven body through the air inlet for drying. In order to ensure the drying efficiency, the hot air will not be directly discharged from the oven body. A part of the hot air after heating and drying leaves the oven body through the air outlet, and another part of the hot air passes through the circulation pipeline outside the oven body and converges with the new hot air heated by the heat transfer oil, and then returns to the oven body together through the air inlet to realize the hot air circulation.

[0068] However, during this drying process, the heat transfer efficiency between the heat transfer oil and the air is low and the loss is large. The energy actually used for drying is less than 10%, and the energy utilization rate is low, resulting in low drying and production efficiency. And because the structure of the circulation air path is complex and the volume is large, the manufacturing cost of the equipment is high and the floor area is large. In addition, due to the complex air path of the circulation air path, it is difficult to control the negative pressure environment of the oven device. For example, the debugging time required to adjust it to negative pressure is relatively long.

[0069] To solve at least one of the above problems, an embodiment of the present application provides an oven, including a box body, an infrared heating component and a blowing chamber; the box body has an air inlet and an air outlet; the infrared heating component is arranged in the box body, and the infrared heating component is used to emit infrared rays to heat the electrode plate to be dried conveyed into the box body along the conveying direction of the electrode plate; the blowing chamber is arranged in the box body, and the blowing chamber is communicated with the air inlet. The blowing chamber includes a first sub-air chamber, a second sub-air chamber and a communication chamber connecting the first sub-air chamber and the second sub-air chamber. The blowing chamber is provided with a blowing part, and the blowing part is arranged in at least one of the first sub-air chamber and the second sub-air chamber; the air inlet is used to convey air flow into the blowing chamber so that the air flow leaves the box body.

[0070] In this embodiment, an infrared heating component is used to dry the electrode sheet to be dried. Compared with the circulating hot air heating in the related art, the heating method is converted from heat convection to heat radiation, and the heat can directly act on the slurry on the electrode sheet to be dried, heating deeply inside, with high drying efficiency. The drying speed can be increased by more than 25%. At the same time, the air flow can enter the box body from the air inlet and leave the box body from the air outlet, without the need for circulation. The heat transfer oil heating package and the circulation pipeline in the related art can be cancelled, reducing the structural complexity and volume of the equipment, reducing the manufacturing cost, and also reducing the control difficulty in complex environments and shortening the debugging time.

[0071] The embodiment of the present application also provides a coating and drying device, and the coating and drying device includes the oven in any of the above embodiments.

[0072] The oven and the coating and drying device provided by the embodiment of the present application can be used in, but not limited to, the drying scenario of battery electrode sheets. It can also be used in the drying process of other slurries.

[0073] In the embodiment of the present application, the oven and the coating and drying device can be used to dry the electrode sheet to be dried, so as to manufacture the positive electrode sheet of the battery cell or the negative electrode sheet of the battery cell. The electrode sheet can include a current collector and an active material layer, and the active material can be a positive electrode active material or a negative electrode active material.

[0074] As an example, the current collector has two surfaces opposite to each other in its own thickness direction, and the active material is disposed on any one or both of the two opposite surfaces of the current collector.

[0075] As an example, the positive electrode current collector can be a metal foil or a composite current collector. As an example, the negative electrode current collector can be a metal foil, a foam metal or a composite current collector.

[0076] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0077] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide and their respective modified compounds. However, the embodiment of the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate can include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated 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 manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0078] 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, and lithium titanate, etc. The silicon-based materials may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the embodiments of the present application are not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0079] In addition, the electrode sheet dried by the embodiments of the present application can be used in battery cells, battery devices including battery cells, electrical devices using battery devices, and energy storage devices.

[0080] In the embodiments of the present application, the energy storage device using the battery device as a power source includes one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0081] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electric energy as needed and output electric energy at an appropriate time. For example, the energy storage device can store electric energy during low electricity consumption periods and provide electric energy to relevant users or electrical devices during high electricity consumption periods. The energy storage system provided by the embodiments of the present application can be any power system that requires an energy storage device. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0082] In the embodiments of the present application, the electrical device using the battery device as a power source can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0083] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described energy storage devices and electrical devices, but also applicable to all battery devices having electrode sheets and electrical devices using battery devices.

[0084] Figure 1 Is a cross-sectional view of the oven for the embodiments of the present application; Figure 2 Is Figure 1Partial enlarged schematic diagram of the mid-infrared heating component and the blowing part; Figure 3 is Figure 2 Front view of the middle air nozzle; Figure 4 is Figure 2 Top view of the middle air nozzle; Figure 5 is Figure 2 Side view of the middle air nozzle; Figure 6 is Figure 3 Cross-sectional view at A-A in the middle; Figure 7 Partial enlarged schematic diagram of the infrared heating component and the blowing part of another embodiment of the present application; Figure 8 is Figure 1 Schematic diagram of the structure of the air supply chamber in the middle.

[0085] Please refer to Figures 1 to 8 , an oven 10 provided by an embodiment of the present application includes: a box body 100, an infrared heating component 200, and an air supply chamber 300. The box body 100 has an air inlet and an air outlet; the infrared heating component 200 is arranged in the box body 100, and the infrared heating component 200 is used to emit infrared rays to heat the to-be-dried pole piece 20 conveyed into the box body 100 along the pole piece conveying direction; the air supply chamber 300 is arranged in the box body 100, and the air supply chamber 300 is communicated with the air inlet 110. The air supply chamber 300 includes a first sub-air chamber 310, a second sub-air chamber 320, and a communication chamber 330 communicating the first sub-air chamber 310 and the second sub-air chamber 320. The air supply chamber 300 is provided with a blowing part 400 for blowing towards the to-be-dried pole piece. The blowing part 400 is arranged in at least one of the first sub-air chamber 310 and the second sub-air chamber 320; the air inlet 110 is used to convey air flow into the air supply chamber 300, so that the air flow can blow towards the to-be-dried pole piece 20 through the blowing part 400 and leave the box body through the air outlet 120.

[0086] Among them, the to-be-dried pole piece may include a current collector and an active material layer coated on the surface of the current collector. The active material layer may be a positive active material layer or a negative active material layer. The coating method of the active material layer may be gravure coating, that is, the to-be-dried pole piece may be obtained by forming an active material layer on the surface of the current collector by gravure coating. The active material layer formed by gravure coating is thinner and is convenient for drying. In other embodiments, the coating method may also be dip coating, extrusion coating and other coating methods.

[0087] It can be understood that since the active material layers can be provided on both surfaces of the current collector, during processing, the active material layer can be coated on one surface of the current collector first, then dried through the oven 10, and then the active material layer is coated on the other surface of the current collector, and then dried through the oven 10 again to obtain the electrode sheet. The electrode sheet to be dried in this embodiment can refer to the structure in which only one surface is coated with the active material layer to be dried in the above steps, or it can also be the structure in which one side has been dried and the other surface is coated with the active material layer to be dried.

[0088] In this embodiment, the box body 100 can be a box-shaped or shell-shaped structure with a space inside. The shape of the box body 100 can be various, such as a cube, a sphere, a cuboid or other irregular shapes, etc.

[0089] Figure 1 and Figure 2 In the figure, X represents the electrode sheet conveying direction, Y represents the first direction perpendicular to the electrode sheet conveying direction, Z represents the second direction perpendicular to the electrode sheet conveying direction, and the first direction Y and the second direction Z are perpendicular to each other. The electrode sheet 20 to be dried can be conveyed into the box body along the electrode sheet conveying direction X for drying. The electrode sheet conveying direction X can be Figure 1 the direction from left to right in the figure.

[0090] An air inlet 110 and an air outlet 120 are provided on the box body 100. The air inlet 110 can be an opening directly provided on the wall surface of the box body 100, or an air inlet box can be provided on the box body 100. The air inlet box can be a boxed structure, which can be embedded on the box body 100 and can have an opening for air flow to pass through. The opening of the air inlet box can form the air inlet 110. It can be understood that some air guiding plates can also be provided in the air inlet box, so as to play a role in guiding air and stabilizing the air flow.

[0091] The air outlet 120 can also be an opening provided on the box body 100, or an air outlet box can be provided on the box body 100. The air outlet box can be a boxed structure, which can be embedded on the box body 100 and can have an opening for air flow to pass through inside. The opening of the air outlet box can form the air outlet 120. It can be understood that some air guiding plates can also be provided in the air inlet box, so as to play a role in guiding air and stabilizing the air flow.

[0092] In this embodiment, the air inlet 110 and the air outlet 120 can be provided on the same side of the box body 100. Of course, in other embodiments, they can also be provided on different sides of the box body 100. In addition, taking Figure 2 the up and down direction in the figure as the height direction (the second direction Z), the air inlet 110 and the air outlet 120 can also be located Figure 2On the same height plane, or the air inlet 110 can be located at a higher position, and the air outlet 120 can be located in the middle or above the middle to facilitate the discharge of hot air.

[0093] The infrared heating component 200 can be a heating structure capable of emitting infrared rays. The infrared rays can include far-infrared rays with a wavelength range of 5.6 micrometers to 1000 micrometers. Due to the longer wavelength, the far-infrared rays can penetrate deeper into the object, heating both the inside and the surface of the object simultaneously, resulting in a better drying effect.

[0094] It can be understood that the infrared heating component 200 can radiate electromagnetic waves outward. After the polar plate to be dried absorbs them, the internal molecules and atoms "resonate" to generate heat energy, achieving the heating effect. The infrared heating component enables the infrared rays to directly act on the polar plate to be dried, quickly drying the polar plate and significantly reducing energy consumption. The infrared heating component 200 can be in various shapes such as plate-shaped, tubular, and arc-shaped.

[0095] The air supply chamber 300 can be located inside the box body. There can be a cavity inside the air supply chamber 300 to facilitate the flow of air. It can be understood that the air supply chamber 300 can be provided with an air supply chamber opening, which can communicate with the air inlet 110 on the box body 100, so that the air flow can enter the air supply chamber 300 through the air inlet 110.

[0096] The air supply chamber 300 can include a first sub-air chamber 310, a second sub-air chamber 320, and a connecting chamber 330 connecting the first sub-air chamber 310 and the second sub-air chamber 320. The shapes of the first sub-air chamber 310 and the second sub-air chamber 320 can be the same or different. The first sub-air chamber 310 and the second sub-air chamber 320 can be connected through the connecting chamber 330, and the connecting chamber 330 can have various shapes, such as tubular or prismatic.

[0097] The air supply chamber 300 can be provided with a blowing part 400. The blowing part 400 can be a hole structure provided on the air supply chamber 300. The blowing part 400 can be oriented towards the polar plate 20 to be dried, so that the air flow in the air supply chamber 300 can blow towards the polar plate 20 to be dried. In this embodiment, the blowing part 400 can be provided on the first sub-air chamber 310, or on the second sub-air chamber 320, or on both the first sub-air chamber 310 and the second sub-air chamber 320 simultaneously.

[0098] In some embodiments, a plurality of air guide plates can be provided inside the air supply chamber 300 to play a role in guiding air flow and equalizing pressure.

[0099] It can be understood that the air flow can enter the air supply chamber 300 through the air inlet 110, then leave the air supply chamber 300 via the air blowing part 400, and blow towards the polar plate 20 to be dried. It can be understood that after being heated by the infrared heating component 200, substances such as moisture in the polar plate to be dried can be evaporated, and the air flow blown out by the air blowing part 400 can carry away these substances, and then leave the box body through the air outlet 120, so as to send the evaporated water vapor and other gases away from the box body 100 and maintain a dry environment in the box body.

[0100] It can be understood that in some embodiments, an air flow passage can be arranged in the box body, such as a pipeline or a separated air flow space, so that the air flow blowing towards the polar plate 20 to be dried can flow towards the air outlet via the air flow passage or the air flow space. In this embodiment, the air flow can flow from the space between the first sub-air chamber 310 and the second sub-air chamber 320 to the air outlet 120, so as to increase the air discharge volume, enable the air with water vapor to be discharged in time, avoid the formation of condensed water in the box body, and improve the drying effect.

[0101] In some embodiments, the air flow blown by the air blowing part 400 towards the polar plate 20 to be dried can flow towards the air outlet 120 through the gap between the inner wall of the box body 100 and the air supply chamber 300.

[0102] In this embodiment, the volume of the air supply chamber 300 can be smaller than the volume of the box body 100, so that there is a space between the inner wall of the air supply chamber 300 and the box body 100. The air flow blowing towards the polar plate to be dried flows towards the air outlet 120 through the space and leaves the box body 100. The shape and size of the space can be set according to the actual situation.

[0103] In this embodiment, the gap between the inner wall of the box body and the air supply chamber is used for exhaust. After the air flow blows towards the polar plate 20 to be dried, it can flow towards the air outlet through the gap between the side wall of the box body and the air supply chamber and the space between the bottom wall of the box body and the air supply chamber, without the need to additionally arrange an exhaust passage, which simplifies the air path structure. Moreover, it can also promote the air circulation in the box body, be beneficial to the circulation of the air flow, and maintain a dry environment in the box body.

[0104] In some embodiments, the air flow entering the box body through the air inlet 110 can be normal temperature air flow.

[0105] According to some embodiments of the present application, the temperature T1 of the air flow at the air inlet 110 satisfies: 20°C ≤ T1 ≤ 30°C.

[0106] In this embodiment, the temperature T1 at the air inlet 110 can be 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, etc. Additionally, T1 can also have different temperature ranges, such as 22°C ≤ T1 ≤ 30°C, or 20°C ≤ T1 ≤ 28°C, or 22°C ≤ T1 ≤ 28°C.

[0107] By setting the temperature range of T1 in this embodiment, T1 can be at room temperature, and the air flow can play a role in taking away gases such as water vapor without having to bear the heating function. Thus, the heat-conducting oil heating pack in the related art can be eliminated, reducing energy consumption and the volume of the equipment.

[0108] In this embodiment, an infrared heating component is used to dry the electrode sheet to be dried. Compared with the circulating hot air heating in the related art, the heating method is converted from heat convection to heat radiation. The heat can directly act on the active material (slurry) on the electrode sheet to be dried, heating deeply inside, with high energy utilization efficiency and high drying efficiency. The drying speed can be increased by more than 25%. Moreover, due to the high energy utilization efficiency, the heating temperature of the infrared heating component can reach the temperature required for drying (such as 150°C to 160°C), and there is no need to rely on the heat of the circulating air in the related art to ensure the drying efficiency and maintain the temperature inside the box. Thus, the air volume required inside the box can be reduced (by about 80%), and there is no need to heat the air flow through a heat-conducting oil heating pack. Only the infrared heating component and the room-temperature air flow can achieve an efficient drying effect, thereby significantly reducing energy consumption (by more than 40%).

[0109] Meanwhile, the room-temperature air flow can enter the box from the air inlet and leave the box from the air outlet without the need for circulation. The heat-conducting oil heating pack and the circulation pipeline in the related art can be eliminated, optimizing the air path structure, reducing the structural complexity and volume of the equipment, and reducing the manufacturing cost.

[0110] It can be understood that in the related art, in order to maintain the negative pressure inside the oven device, negative pressure chambers are usually set on both sides. The negative pressure chambers are connected to the air outlet pipe through pipelines. When positive pressure is generated inside the device, the internal air and external air can enter the negative pressure chambers and then enter the air outlet pipe through the pipelines and be discharged to maintain the negative pressure inside the device and prevent the hot air inside the device from being discharged and hurting people. Therefore, in the related art, it is necessary to ensure the stability of the circulating air path, air inlet, and air exhaust simultaneously and maintain the negative pressure inside the main body of the oven device. However, in this embodiment, there is no need for circulating air, and the negative pressure of the box is easy to control, thereby reducing the control difficulty, shortening the debugging time, and improving the stability of the air path. Additionally, since the negative pressure is easy to achieve, positive pressure is not easily generated inside the box, and because room-temperature air flow can be used, the exhaust temperature is relatively low. Even if positive pressure is generated inside the box, the relatively low gas temperature will not cause scalding. Moreover, since the negative pressure is easy to achieve, the negative pressure chamber can be eliminated in this embodiment, further reducing the volume of the equipment.

[0111] In addition, in the related art, when the oven device starts up, shuts down, or experiences an abnormal shutdown, such as during the cutting, first-piece production, or abnormal shutdown of the electrode sheet to be dried, it takes a long time to wait for the device to heat up and cool down. By using the infrared heating component in the embodiments of the present application, the heating up and cooling down can be quickly achieved. The start-up heating time of originally 30 minutes can be compressed to about 5 minutes, and the abnormal shutdown cooling time of originally about 2 hours can be compressed to about half an hour.

[0112] In the related art, when using hot air for heating, all positions on the electrode sheet are evenly heated, but the tab position is prone to heat softening and wrinkling, resulting in risks such as tape breakage, tab marking, and winding scrapping. However, the infrared heating method provided in the embodiments of the present application can directly act on the active material (slurry), and the heat absorption range is controlled within the active material range. Due to the specular reflection and poor silver heat absorption effect at the tab position, the temperature is lower than that of the active material position. The tab is less affected by infrared rays and is not easily softened by high temperature, reducing the risk of tab high-temperature wrinkling. It can be understood that tab glue needs to be set on both sides of the tab of some electrode sheets. In the hot air drying method in the related art, the tab glue dries slowly and is prone to sticking to the roller. However, in this embodiment, through the infrared drying method, the tab glue can be quickly dried, which can improve the coating speed of the coating and drying equipment and alleviate the bottleneck of production capacity.

[0113] According to some embodiments of the present application, as Figure 2 shown, the infrared heating component 200 includes a plurality of heating elements 210 arranged at intervals along the electrode sheet conveying direction. The heating element 210 extends along a first direction perpendicular to the electrode sheet conveying direction, and the heating element 210 has a heating surface 220 for facing the electrode sheet 20 to be dried, and the heating surface 220 is used to emit infrared rays.

[0114] In this embodiment, Figure 2 the direction from left to right is the electrode sheet conveying direction X of the electrode sheet 20 to be dried. The direction perpendicular to the paper surface in the figure can be the first direction Y, and the up and down direction in the figure can be the second direction Z. Any two of the electrode sheet conveying direction X, the first direction Y, and the second direction Z can be perpendicular to each other.

[0115] In this embodiment, the infrared heating component 200 includes a plurality of heating elements 210. The plurality of heating elements 210 can be arranged at intervals along the electrode sheet conveying direction X, for example, they can be arranged at equal intervals. Each heating element 210 can extend in a strip shape along the first direction Y. The dimension length of the heating element 210 along the first direction Y can be 1 m - 2 m. For example, it can be 1.4 m, 1.5 m, 1.6 m, 1.7 m, 1.8 m, etc.

[0116] Of course, in some embodiments, the heating element 210 may also include multiple segments arranged at intervals along the first direction, and each segment may also extend in a strip shape along the first direction Y.

[0117] In addition, the heating element 210 may be directly connected to the inner wall of the box body 100, or may be indirectly connected to the inside of the box body 100 through a connecting member or an air supply chamber, etc. For example, Figure 2 the air supply chamber 300 has a first bottom wall 340 facing the to-be-dried electrode sheet 20, and the heating element 210 may be connected to the outer surface of the first bottom wall 340. The heating element 210 has a heating surface 220, and the heating surface of the heating element 210 may be the surface of the heating element 210 facing the to-be-dried electrode sheet. For example, Figure 2 the surface of the heating element 210 facing away from the first bottom wall 340 may constitute the heating surface. The heating element 210 can emit infrared rays through the heating surface 220 to heat the to-be-dried electrode sheet. It can be understood that the heating surface 220 of the heating element 210 may face the to-be-dried electrode sheet 20, that is, the two may be arranged opposite to each other, the two may be parallel, or may have a certain inclination angle.

[0118] In this embodiment, by providing a plurality of heating elements 210, the heating elements can generally cover the to-be-dried electrode sheet along the electrode sheet conveying direction, improving the heating area and the drying efficiency. In addition, the heating element has a heating surface facing the to-be-dried electrode sheet, and the two are arranged opposite to each other, so that the infrared rays emitted by the heating surface can directly act on the to-be-dried electrode sheet, and the drying efficiency is high. And since the to-be-dried electrode sheet is also generally flat, heat is radiated through the heating surface, so that the radiation received by the to-be-dried electrode sheet is relatively uniform, and problems such as wrinkling or cracking caused by uneven heating can be improved.

[0119] According to some embodiments of the present application, such as Figure 1 and Figure 2 shown, the air supply chamber 300 has a first bottom wall 340 for facing the to-be-dried electrode sheet 20, and the infrared heating assembly 200 is connected to the outer surface of the first bottom wall 340 facing away from the air supply chamber 300.

[0120] In this embodiment, such as Figure 1 shown, the air supply chamber 300 is arranged above the to-be-dried electrode sheet 20, and the wall surface of the air supply chamber 300 facing the to-be-dried electrode sheet 20 may be the first bottom wall 340, and the first bottom wall 340 may extend in the plane direction.

[0121] The outer surface of the first bottom wall 340 may be the outer surface of the first bottom wall 340 facing away from the inner cavity of the air supply chamber 300, that is, Figure 1 the lower surface of the first bottom wall 340 in

[0122] In this embodiment, by arranging the infrared heating component 200 and the blowing part 400 on the first bottom wall, the two can be close to the to-be-dried electrode sheet 20, so that the infrared rays emitted by the infrared heating component 200 can directly act on the to-be-dried electrode sheet 20, shortening the radiation path between the two, which is beneficial to improving the drying efficiency.

[0123] According to some embodiments of the present application, a bracket 230 is arranged in the box body 100, the heating element 210 is connected to the bracket 230, and the heating element 210 can move relative to the bracket 230 along the second direction to adjust the distance between the heating element 210 and the to-be-dried electrode sheet 20; wherein, the first direction, the electrode sheet conveying direction, and the second direction are perpendicular to each other in pairs.

[0124] The bracket 230 can be directly or indirectly connected to the inside of the box body 100 through common connection methods, such as screwing, welding, or riveting, etc. In some embodiments, such as Figure 2 , the bracket 230 can be connected to the outer surface of the air supply chamber 300, such as the outer surface of the first bottom wall 340, so as to be indirectly connected to the inside of the box body 100 through the air supply chamber 300.

[0125] The structure of the bracket 230 can be various. For example, the bracket 230 can be in an inverted U-shaped structure, and the heating element 210 can be connected to the opening position of the U-shaped structure. Another example is that the bracket 230 can be arranged around the heating element 210 in the XY plane, and the heating element 210 can be located in the space surrounded by the bracket.

[0126] The heating element 210 can move relative to the bracket 230 along the second direction Z, and there are various implementation methods. For example, screws that can rotate relative to the bracket can be arranged on both sides of the bracket 230 along the electrode sheet conveying direction X, and the screws can extend along the second direction Z. Nuts can be arranged on both sides of the heating element 210, and the nuts can be screwed onto the screws to form a lead screw-nut mechanism, so that the heating element 210 can move up and down relative to the bracket.

[0127] Another example is that the bracket 230 has a plurality of clamping positions arranged at intervals along the second direction Z, and the heating element 210 can be clamped in one of the plurality of clamping positions. By adjusting the clamping position of the heating element 210, the height of the heating element 210 in the second direction can be adjusted. In addition, the movement of the heating element 210 relative to the bracket 230 can be adjusted manually or automatically by equipment, and can be selected and set according to actual situations.

[0128] It can be understood that by adjusting the height of the heating element 210 in the second direction Z, the distance between it and the to-be-dried electrode sheet can be adjusted, and thus the active material with different coating thicknesses can be adapted, that is, the oven can be used for to-be-dried electrode sheets of various thicknesses, improving the versatility of the oven.

[0129] According to some embodiments of the present application, please refer to Figure 2 , the heating element 210 includes a substrate 211 connected inside the box body 100 and a heating layer 212 disposed on one side of the substrate 211. The surface of the heating layer 212 facing away from the substrate 211 constitutes the heating surface 220 of the heating element 210.

[0130] Among them, the substrate 211 may be a plate-like structure, for example, it may be made of materials such as glass, plastic, or metal. The substrate 211 can be connected inside the box body 100, and this connection can be a direct connection or an indirect connection. For example, a connecting member can be provided inside the box body 100, and the substrate 211 can be installed on the connecting member to be indirectly connected to the box body 100. Or, the substrate 211 can be directly connected to the inner wall of the box body 100 by means of bonding, screwing, clamping, etc.

[0131] In some embodiments, the substrate 211 can be connected to the outer surface of the first bottom wall 340, so that it can be indirectly connected to the inside of the box body 100 through the air supply chamber. In addition, when a bracket 230 is provided on the first bottom wall 340, the substrate 211 can be connected to the bracket 230 to be connected to the first bottom wall 340 through the bracket 230. The heating layer 212 can be a structure provided on the surface of the substrate 211, and it can be a heat-generating coating structure. The heating layer 212 can be connected to the substrate 211 by means of coating, gluing, or other common methods. The heating layer 212 can be provided on the surface of the substrate 211 facing away from the first bottom wall 340, such as the lower surface in the figure.

[0132] In one embodiment, the substrate 211 can be glass-ceramics. As a kind of fireproof material for aviation, the softening temperature of glass-ceramics can reach 900 °C, which is extremely high-temperature resistant. The heating layer 212 can be a graphene coating. The graphene coating has a small resistivity, and only a small potential can make electrons move rapidly and collide to generate heat, and thermal radiation occurs, so that it can heat up quickly.

[0133] It can be understood that through experimental verification, compared with hot air drying in the related art, the cost and energy consumption are significantly reduced after using the heating element with the substrate and the heating layer.

[0134] In this embodiment, through the substrate and the heating layer, the structure of the heating element can be simplified and the cost can be reduced. At the same time, by using the infrared rays emitted by the heating layer to radiate electromagnetic waves outward, the energy consumption can be greatly reduced while maintaining the drying effect.

[0135] In some embodiments, the width dimension of multiple heating elements along the pole piece conveying direction X may gradually decrease along the pole piece conveying direction. It can be understood that since the pole piece 20 to be dried is transported into the box body 100 along the pole piece conveying direction, as it passes through multiple heating elements in sequence, the degree of drying gradually increases. That is to say, the pole piece 20 to be dried requires more heat when it first enters the box body 100, and as it moves, the required heat gradually decreases. By gradually decreasing the width of the heating elements along the pole piece conveying direction, the heat generation of the heating elements can be reduced, thereby improving the utilization rate of thermal energy.

[0136] In some embodiments, the width dimension of the heating element 210 along the pole piece conveying direction X may be 350 mm - 500 mm. For example, it may be 400 mm, 450 mm, etc. The heating element 210 can keep the temperature of the active material at approximately 150°C to 160°C, thereby meeting the drying effect.

[0137] According to some embodiments of the present application, such as Figure 2 , the minimum distance L1 between two adjacent heating elements 210 in the pole piece conveying direction satisfies: 100 mm ≤ L1 ≤ 200 mm.

[0138] In this embodiment, L1 may be the interval dimension between two adjacent heating elements 210. L1 may be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc. In some embodiments, L1 may also have other ranges. For example, 120 mm ≤ L1 ≤ 200 mm, or 100 mm ≤ L1 ≤ 180 mm, or 120 mm ≤ L1 ≤ 180 mm.

[0139] In this embodiment, by setting the maximum value of L1 to 200 mm, the distance between two adjacent heating elements can be prevented from being too large, so as to cover the surface of the pole piece to be dried as much as possible, thereby improving the drying efficiency. In addition, the minimum value of the dimension of L1 is 100 mm, which can reserve a certain space for setting the blowing part, facilitating the installation of the blowing part, and at the same time, reducing costs.

[0140] In some embodiments, the minimum distance L1 between two adjacent heating elements may also gradually increase along the pole piece conveying direction X. It can be understood that since the pole piece 20 to be dried is transported into the box body 100 along the pole piece conveying direction, as it passes through multiple heating elements in sequence, the degree of drying gradually increases. That is to say, the pole piece 20 to be dried requires more heat when it first enters the box body 100, and as it moves, the required heat gradually decreases. By gradually increasing L1, the utilization rate of thermal energy can be improved.

[0141] According to some embodiments of the present application, continue to refer toFigure 2 The distance L2 between the heating surface 220 of the heating member 210 and the to-be-dried electrode sheet 20 in the second direction satisfies: 10 mm ≤ L2 ≤ 15 mm. Among them, the first direction, the electrode sheet conveying direction, and the second direction are perpendicular to each other pairwise.

[0142] In this embodiment, L2 can be the interval dimension between the heating member 210 and the to-be-dried electrode sheet 20. When the heating member 210 and the to-be-dried electrode sheet 20 are parallel, L2 can be the perpendicular distance between the planes where they are located. When the heating member is not parallel to the to-be-dried electrode sheet 20, L2 can be the distance of each position between the two in the second direction Z.

[0143] It can be understood that the heating surface can be close to the to-be-dried electrode sheet 20. In addition, there can be an interval between the two to avoid scratching the active material layer on the heating surface.

[0144] L2 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc. In some embodiments, L1 can also have other ranges. For example, 12 mm ≤ L2 ≤ 15 mm, or for another example, 10 mm ≤ L2 ≤ 13 mm, or 12 mm ≤ L2 ≤ 14 mm.

[0145] In this embodiment, by setting the maximum value of L2 to 15 mm, the heating member can be prevented from being too far away from the to-be-dried electrode sheet, thereby improving the utilization rate of thermal energy and the drying efficiency. In addition, the minimum value of the size of L2 is 10 mm, which can avoid the distance between the heating member and the to-be-dried electrode sheet from being too close, so that the to-be-dried electrode sheet can be heated more evenly, and the problem of cracking of the active material layer will not occur, and the drying effect is better.

[0146] According to some embodiments of the present application, such as Figures 1 to 6 The blowing part 400 is connected to the first bottom wall 340 of the air supply chamber 300 facing the to-be-dried electrode sheet 20. The blowing part 400 includes a plurality of air nozzles 410 arranged at intervals along the electrode sheet conveying direction. The air nozzles 410 extend in the first direction perpendicular to the electrode sheet conveying direction, and a heating member 210 is arranged between two adjacent air nozzles 410.

[0147] The blowing unit 400 can be arranged on the first bottom wall 340, that is, the air flow in the air supply chamber 300 can pass through the first bottom wall 340 and blow towards the to-be-dried electrode sheet 20. The blowing unit 400 includes a plurality of air nozzles 410. The plurality of air nozzles 410 can be arranged at intervals along the electrode sheet conveying direction X, for example, they can be arranged at equal intervals. Each air nozzle 410 can extend in a strip shape along the first direction Y. It can be understood that the air nozzle 410 can have an air nozzle opening for air outlet, and the air nozzle opening extends in a strip shape along the first direction Y. The length dimension of the air nozzle 410 along the first direction Y can be greater than or equal to 1 m and less than or equal to 2 m. For example, it can be 1.4 m, 1.5 m, 1.6 m, 1.7 m, 1.8 m, etc.

[0148] Of course, in some embodiments, the air nozzle 410 can also include a plurality of sub-air nozzles arranged at intervals along the first direction, and each sub-air nozzle can also extend in a strip shape along the first direction Y.

[0149] In addition, the air nozzle 410 can be connected to the first bottom wall 340. For example, the air nozzle 410 can be directly formed by opening a hole in the first bottom wall 340. Or, there is an opening provided on the first bottom wall 340, and the air nozzle 410 can be a separate component, and it can be fixed to the first bottom wall 340 around the opening by common connection methods such as screwing, clamping, welding, etc.

[0150] It can be understood that the air nozzle 410 can be arranged facing the to-be-dried electrode sheet 20, so that the air flow blown out by the air nozzle 410 can directly blow towards the to-be-dried electrode sheet 20.

[0151] In this embodiment, normal-temperature air can form an air flow entering from the air inlet 110. The air flow enters the air supply chamber 300, and then uniformly blows out through a plurality of air nozzles 410 above the to-be-dried electrode sheet 20, taking away the water vapor evaporated on the to-be-dried electrode sheet 20, and then can flow towards the air outlet through the space between the box body 100 and the air supply chamber 300, and then be blown out from the air outlet.

[0152] In some embodiments, the air nozzle 410 can blow air downward along the second direction Z. That is to say, the air nozzle can blow air in the downward direction in Figure 1 so that the air outlet is more uniform, and the air flow can directly act on the to-be-dried electrode sheet, and the drying efficiency is higher.

[0153] As Figure 1 shown, the air nozzle 410 and the heating element 210 can be arranged alternately, that is, one heating element 210 can be arranged between two air nozzles.

[0154] In this embodiment, the blowing part 400 is close to the to-be-dried electrode sheet 20, so that the air flow blown out by it can first pass through the surface of the to-be-dried electrode sheet 20. The air flow is relatively concentrated, so that water vapor and other gases can be quickly carried away, further improving the drying efficiency. By providing a plurality of air nozzles, the air can be discharged more evenly, the to-be-dried electrode sheet is uniformly and stably stressed, the probability of jitter is small, and the coating stability is high. In addition, by alternately arranging the air nozzle 410 and the heating element 210, the air flow can be more evenly distributed at various positions of the to-be-dried electrode sheet, so that water vapor can be taken away in time and the drying effect is improved.

[0155] According to some embodiments of the present application, the air nozzle 410 includes a first section 411 connected to the first bottom wall 340 and a second section 412 connected to the end of the first section 411 facing away from the first bottom wall 340; the first section 411 communicates with the air supply chamber 300 through a plurality of first through holes 420, the second section 412 communicates with the first section 411 through a plurality of second through holes 430, and the end of the second section 412 facing away from the first section 411 has a holding section 413. The flow-through area of the holding section 413 is equal everywhere, and the flow-through area S1 of the holding section 413 and the flow-through area S2 of the end of the second section close to the first section 411 satisfy: S1 < S2.

[0156] In this embodiment, the flow-through area may be the area of a cross-section perpendicular to the direction of the air flow. The air nozzle 410 may include a first section 411 and a second section 412. The first section 411 is connected to the first bottom wall 340, and the second section 412 is connected to the end of the first section 411 facing away from the first section 411. It can be understood that both the first section and the second section can be components with cavities inside, so as to facilitate the passage of air flow. The first section and the second section can be connected by a snap connection method, thus simplifying the connection complexity.

[0157] Such as Figure 4 and Figure 6 , the first section 411 communicates with the air supply chamber 300 through a plurality of first through holes 420. It can be understood that a plurality of first through holes 420 may be provided on the top surface of the first section 411, and corresponding first openings may be provided on the first bottom wall of the air supply chamber 300. The plurality of first through holes 420 may communicate with the first openings. Among them, the first opening may be an opening with a relatively large area covering the plurality of first through holes 420, or the first opening may include a plurality of first sub-holes, and each first sub-hole may communicate with a first through hole 420.

[0158] In addition, the second section 412 can communicate with the first section 411 through a plurality of second through-holes 430. It can be understood that a plurality of second through-holes 430 can be provided on the top surface of the second section 412, and corresponding second openings can be provided on the bottom wall of the first section 411. The plurality of second through-holes 430 can communicate with the second openings. Among them, the second opening can be an opening covering a relatively large area of the plurality of second through-holes 430, or the second opening can include a plurality of second sub-holes, and each second sub-hole can communicate with one second through-hole 430.

[0159] In one embodiment, the first section 411 can be generally in an inverted U-shaped structure, and the opening at its bottom can form the second opening, thereby simplifying the structure of the air nozzle 410.

[0160] In addition, as Figure 5 and Figure 6 shown, one end of the second section 412 close to the electrode sheet 20 to be dried can have a holding section 413, and the air nozzle opening can be provided at one end of the holding section 413 facing the electrode sheet 20 to be dried. In this embodiment, the flow-through area S1 of the holding section 413 can refer to the area at the cross-section where the arrow S1 is located. It can be understood that since the holding section 413 blows air downward in the second direction Z, taking the plane perpendicular to the second direction Z as the cross-section, the flow-through area of the holding section 413 is equal everywhere, which can refer to that the cross-sectional area of the holding section 413 is equal everywhere in the second direction Z.

[0161] The flow-through area S2 of one end of the second section 412 close to the first section 411 can refer to the area of the cross-section where the arrow S2 is located. S2 is greater than S1, so that the second section 412 can gradually reduce the flow-through area of the air flow, so that the air flow can be blown out at a relatively stable speed.

[0162] In some embodiments, the second section 412 can further include a constant cross-section section and a variable cross-section section. The constant cross-section section, the variable cross-section section and the holding section can be connected in sequence. The flow-through areas of the constant cross-section section can be substantially equal, and it can communicate with the first section 411. The flow-through area of the variable cross-section section can gradually decrease from the constant cross-section section to the holding section, so that the air flow can transition more stably from the first section to the holding section, which helps the stability of the air flow.

[0163] In addition, continuing to refer to Figure 6 , in some embodiments, the flow-through area S3 of the first section 411 can be greater than the flow-through area S2 of one end of the second section 412 close to the first section 411, and since the two are communicated through a plurality of second through-holes 430, it can play a role in stabilizing the air flow while converging the air flow, and the air outlet is more uniform.

[0164] In this embodiment, through a plurality of first through-holes and a plurality of second through-holes, the air flow can enter the second section from the air supply chamber through the first section more stably. At the same time, by setting S1 greater than S2 and S1 being equal everywhere, the flow area of the air flow can be gradually reduced, so that the air flow can be blown out at a relatively stable speed.

[0165] In some embodiments, the length of the holding section 413 along the pole piece conveying direction X can be 1 mm - 3 mm. For example, it can be 2 mm, so that each air flow can be blown out at a speed of approximately 125 m 3 / h, so as to better achieve drying.

[0166] According to some embodiments of the present application, such as Figure 5 and Figure 6 , a folding section 414 parallel to the first bottom wall 340 is further provided at one end of the holding section 413 facing away from the second section 412. The folding section 414 is arranged on both sides of the holding section 413 along the pole piece conveying direction.

[0167] In this embodiment, the folding section 414 can be parallel to the XY plane. It can be arranged at the end of the holding section 413 facing away from the first section 411, that is, on both sides of the air nozzle opening. The folding section 414 can include two parts. Taking the direction parallel to the pole piece conveying direction as the third direction, one part is located at the left end of the holding section 413 along the third direction, and the other part is located at the right end of the holding section 413 along the third direction.

[0168] It can be understood that the first section 411, the second section 412, the holding section 413 and the folding section 414 can also extend in a strip shape along the second direction Y following the air nozzle.

[0169] The folding section 414 can be formed by sheet metal processing, or the folding section 414 can be connected to the holding section 413 by welding, gluing or other means.

[0170] In this embodiment, the folding section 414 can play a role in converging the air flow, so that the air blown out from the holding section can be blown towards the pole piece to be dried as much as possible, thereby minimizing the movement of the air flow along the second direction Z away from the pole piece to be dried, and thus improving the drying efficiency. At the same time, since the pole piece to be dried may vibrate during the conveying process, the folding section 414 can provide a relatively large plane, which can contact this plane when the pole piece to be dried vibrates. Compared with the pole piece to be dried directly contacting the relatively small air nozzle opening, the folding section 414 can reduce the damage to the active material layer and help improve the processing quality of the pole piece.

[0171] According to some embodiments of the present application, such as Figure 2 , the distance L3 between two adjacent air nozzles 410 in the pole piece conveying direction satisfies: 400 mm ≤ L3 ≤ 500 mm.

[0172] In some embodiments, L3 may be the spacing dimension between the centerlines of two adjacent air nozzles 410, and L3 may be 400mm, 410mm, 420mm, 430mm, 440mm, 450mm, 460mm, 470mm, 480mm, 490mm, 500mm, etc. In some embodiments, L3 may also have other ranges. For example, 420mm ≤ L3 ≤ 500mm, or, 400mm ≤ L3 ≤ 480mm, or, 420mm ≤ L3 ≤ 480mm.

[0173] It can be understood that by setting the minimum value of L3 to 400mm, the spacing between the air nozzles will not be too small, so that there is enough space between the air nozzles to set the heating element, and the size of the heating surface can meet the drying effect of the electrode sheet to be dried. With the maximum value of L3 being 500mm, the spacing between the air nozzles will not be too large, and the water vapor can be taken away by the air flow in time, so that a good drying effect can be achieved.

[0174] In some embodiments, the height dimension of the air nozzle 410 in the second direction Z may be 10mm - 30mm. For example, it may be 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, etc.

[0175] In addition, the dimension length of the air nozzle 410 in the first direction Y may be 1m - 2m. For example, it may be 1.4m, 1.5m, 1.6m, 1.7m, 1.8m, etc.

[0176] In some embodiments, please refer to Figure 2 , the air outlet direction of the air nozzle 410 is parallel to the second direction Z; among them, the first direction Y, the electrode sheet conveying direction X, and the second direction Z are perpendicular to each other in pairs.

[0177] Figure 2 The arrow at the air nozzle 410 in Figure 2 shows the air outlet direction of the air nozzle 410, and the air flow can be blown out along the direction parallel to the second direction Z, that is, the air flow can be blown out along the

[0178] vertically downward direction in

[0179] Please refer to Figure 7In some embodiments, the air outlet direction of the air nozzle 410 is tilted relative to the second direction Z; wherein the first direction Y, the pole piece conveying direction X and the second direction Z are perpendicular to each other.

[0180] Understandably, Figure 7 The arrow at the wind nozzle shows the wind direction of the wind nozzle 410. The wind flow can be tilted relative to the second direction Z, that is, there can be an angle between the second direction Z and the wind direction, and the angle can be greater than 0° and less than 90°.

[0181] In some embodiments, one end of the wind flow along the wind outlet direction (the lower end of the wind outlet direction arrow) is located on the side of the other end of the wind flow away from the wind outlet direction (the upper end of the wind outlet direction arrow) close to the air outlet, so that the wind flow blown out by the air nozzle can have a component from the air inlet toward the air outlet.

[0182] refer to Figure 1 and Figure 7 The air inlet 110 is arranged on the left side of the box body 100, and the air outlet 120 is arranged on the right side of the box body 100. At this time, the wind flow blown out by the air nozzle 410 can be blown out from the upper left to the lower right, and the blown wind flow has a movement tendency close to the direction of the air outlet.

[0183] In this embodiment, the air outlet direction of the air nozzle is inclined to the second direction, and the air nozzle has a guiding function, so that the wind flow can have a component along the direction of conveying the electrode while blowing toward the electrode to be dried, thereby helping the wind flow to flow toward the air outlet, promoting the circulation of air in the box, helping the circulation of air inside and outside the box, and keeping the box dry.

[0184] It can be understood that the retaining section 413 of the air nozzle 410 can be used to control the air outlet direction. Figure 5 and Figure 6 In the embodiment, the retaining section 413 can be parallel to the second direction Z, so that the air outlet direction can be as follows Figure 2 In other embodiments, the retaining section 413 can also be arranged to be inclined relative to the second direction Z, so that the wind direction can be as follows: Figure 7 The direction shown is tilted downward.

[0185] According to some embodiments of the present application, Figure 1 The oven 10 also includes: a conveying assembly 500, the conveying assembly 500 includes a plurality of rollers 510 arranged at intervals along the electrode conveying direction, the rollers 510 extend along the first direction, and the rollers 510 are used to carry and convey the electrode 20 to be dried; and each air nozzle 410 is correspondingly arranged with a roller 510 along the second direction; wherein the first direction, the electrode conveying direction and the second direction are perpendicular to each other.

[0186] In this embodiment, the conveying assembly 500 may include a plurality of over rollers 510 arranged at intervals along the pole piece conveying direction X. Each over roller may be of a roller structure and may extend in a strip shape along the first direction Y. The pole piece 20 to be dried can be placed on the over roller 510, so as to increase the contact area with the pole piece to be dried and provide a better supporting and conveying effect.

[0187] When conveying the pole piece to be dried, the over roller 510 can rotate around its own axis, so as to play a conveying role through the static friction force with the pole piece 20 to be dried. It can be understood that in this embodiment, the over roller can always rotate at a relatively uniform speed, so that the pole piece to be dried can be heated and dried when passing through the box body 100, so that it is not necessary to make the pole piece to be dried stay in the box body waiting for heating and drying, thereby improving the production efficiency.

[0188] In addition, in this embodiment, the number of the air nozzles 410 may be the same as the number of the over rollers 510, and each air nozzle 410 may be correspondingly arranged with an over roller 510 along the second direction Z. It can be understood that Figure 1 an over roller 510 may be arranged directly below each air nozzle 410.

[0189] In this embodiment, since the air outlet of the air nozzle is relatively concentrated downward, by corresponding the air nozzle 410 with the over roller 510, it is possible to avoid problems such as the pole piece to be dried being bent due to the air flow blowing the pole piece to be dried, and improve the drying effect.

[0190] According to some embodiments of the present application, such as Figure 1 and Figure 2 , among the plurality of air nozzles 410, the first distance D1 between each air nozzle 410 and the over roller 510 corresponding to the air nozzle in the second direction is equal.

[0191] In this embodiment, such as Figure 2 , the first distance D1 may refer to the distance between the geometric center of the air nozzle and the geometric center of the over roller.

[0192] By making the first distance between each over roller and the corresponding air nozzle equal, the distance between the air nozzle and the pole piece to be dried can be kept consistent, so that the air flow can uniformly carry away the water vapor and other gases on the surface of the pole piece to be dried, and the drying effect is more uniform.

[0193] According to some embodiments of the present application, such as Figure 1 and Figure 2 shown, the box body 100 has a second bottom wall 130 perpendicular to the second direction Z. The conveying assembly 500 is located between the second bottom wall 130 and the air supply chamber 300, and the second distance D2 between the plurality of over rollers 510 and the second bottom wall 130 gradually decreases from the middle to both ends along the pole piece conveying direction.

[0194] In this embodiment, the second bottom wall 130 may be the wall surface below the box body 100 along the second direction Z, and the passing roller may be arranged on the second bottom wall 130.

[0195] Taking the second direction Z as the height direction, in this embodiment, multiple passing rollers may not be in the same height plane. The second distance D2 between the multiple passing rollers 510 and the second bottom wall 130 may first increase and then decrease along the pole piece conveying direction X, so that the height of the middle passing roller 510 is higher than the height of the passing rollers 510 on both sides.

[0196] In addition, since the distance between the air nozzle 410 and the corresponding passing roller 510 remains the same, the height between the air nozzle 410 and the second bottom wall 130 can also first increase and then decrease along the pole piece conveying direction, so that the force on the pole piece to be dried at each air nozzle position is approximately the same, and problems such as bending of the pole piece to be dried caused by uneven force can be avoided.

[0197] In this embodiment, by having different heights of multiple passing rollers, the wrap angle between the pole piece to be dried and the passing rollers can be increased, thereby increasing the contact area and improving the conveying effect of the pole piece to be dried. It can be understood that since the pole piece to be dried can pass through the box body relatively uniformly without staying, by increasing the wrap angle between it and the passing rollers, the conveying effect can be further improved, the pole piece to be dried can be prevented from slipping, and the pole piece processing efficiency can be improved.

[0198] According to some embodiments of the present application, please refer to Figure 8 , the first sub-air chamber 310 and the second sub-air chamber 320 both extend along the pole piece conveying direction, and the first sub-air chamber 310 and the second sub-air chamber 320 are arranged at intervals along a first direction perpendicular to the pole piece conveying direction. One end of the first sub-air chamber 310 facing away from the second sub-air chamber 320 is communicated with the air inlet 110; the first sub-air chamber 310 has a third bottom wall 311 facing the pole piece to be dried 20, and the second sub-air chamber 320 has a fourth bottom wall 321 facing the pole piece to be dried 20, and the blowing part is arranged on the third bottom wall 311 and the fourth bottom wall 321.

[0199] In this embodiment, the first sub-air chamber 310 and the second sub-air chamber 320 may have the same shape, both may extend along the pole piece conveying direction X, and the first sub-air chamber 310 and the second sub-air chamber may be communicated through a communication chamber 330. The communication chamber 330 may extend substantially along the first direction Y. In other embodiments, the shapes of the first sub-air chamber 310 and the second sub-air chamber 320 may also be different.

[0200] The air inlet 110 can be arranged at one end of the first sub-air chamber 310 facing away from the second sub-air chamber 320. The air flow can enter the first sub-air chamber 310 through the air inlet 110 and enter the second sub-air chamber 320 through the communication chamber 330, thus facilitating the transportation of the air flow outside the box body to the inside of the air supply chamber 300.

[0201] In some embodiments, the air inlet 110 is located at a position near the top of the side wall of the box body 100, so that the air flow can enter the air approximately along the horizontal direction (the direction of the XY plane). Compared with the way of the air entering from the top downward, the air flow can enter the first sub-air chamber and the second sub-air chamber more evenly.

[0202] In addition, the two can be arranged at intervals along the first direction Y, that is, there can be a space between the two. This space can be used for air return, so that the air flow blown out by the air nozzle can flow to the air outlet 120 through the interval between the first sub-air chamber 310 and the second sub-air chamber 320, the interval between the first sub-air chamber 310 and the side wall of the box body 100, and the interval between the second sub-air chamber 320 and the side wall of the box body 100, thereby increasing the air exhaust volume, enabling the air with water vapor to be discharged in time, avoiding the formation of condensed water in the box body, and improving the drying effect.

[0203] It can be understood that the first sub-air chamber 310 has a third bottom wall 311 facing the polar plate 20 to be dried, the second sub-air chamber 320 has a fourth bottom wall 321 facing the polar plate 20 to be dried, and the third bottom wall 311 and the fourth bottom wall 321 constitute the first bottom wall 340. The blowing part 400 can be arranged on the third bottom wall 311 and the fourth bottom wall 321, and the infrared heating component 200 can also be arranged on the third bottom wall 311 and the fourth bottom wall 321.

[0204] It can be understood that in the case where the air supply chamber 300 includes the first sub-air chamber 310 and the second sub-air chamber 320, the air nozzle 410 can span the first sub-air chamber 310 and the second sub-air chamber 320 along the first direction Y, that is to say, the air nozzle 410 is an integral body, a part of which is connected to the third bottom wall 311, and the other part is connected to the fourth bottom wall 321. As Figure 4 shown, the first through holes 420 on the air nozzle are roughly divided into two groups, one group facing the third bottom wall 311 of the first sub-air chamber 310, and the other group facing the fourth bottom wall 321 of the second sub-air chamber 320, so that the air received by the polar plate to be dried is more uniform.

[0205] In some embodiments, the air nozzle 410 can include two sub-air nozzles arranged at intervals along the first direction Y, and these two sub-air nozzles can be not connected, so that one sub-air nozzle is connected to the third bottom wall 311 of the first sub-air chamber 310, and the other sub-air nozzle is connected to the fourth bottom wall 321 of the second sub-air chamber 320.

[0206] Similarly, the infrared heating component 200 can also extend along the first direction Y, so that it can span across the third bottom wall 311 and the fourth bottom wall 321. Alternatively, the infrared heating component 200 can include two segments, one segment of the infrared heating component is disposed on the third bottom wall 311, and the other segment of the infrared heating component is disposed on the fourth bottom wall 321.

[0207] In this embodiment, by providing the first sub-air chamber and the second sub-air chamber which are spaced apart, the space for the return air can be increased, which is beneficial to the timely discharge of the air, can avoid the formation of condensed water in the box body, and improves the drying effect.

[0208] According to some embodiments of the present application, continue to refer to Figure 8 , the air inlet 110 communicates with the first end of the first sub-air chamber 310 along the third direction parallel to the electrode sheet conveying direction. The communication chamber 330 extends along the first direction, and one end of the communication chamber 330 communicates with the first end of the first sub-air chamber 310, and the other end of the communication chamber 330 communicates with the first end of the second sub-air chamber 320 along the third direction; and in the third direction, the flow-through area of the first sub-air chamber 310 decreases from the end close to the communication chamber 330 to the end away from the communication chamber 330, and the flow-through area of the second sub-air chamber 320 decreases from the end close to the communication chamber 330 to the end away from the communication chamber 330.

[0209] Among them, as Figure 8 , the electrode sheet conveying direction X is the direction from left to right. The third direction is parallel to the electrode sheet conveying direction, which can be the direction from left to right or the direction from right to left. The left end of the third direction is the first end. The first end (left end) of the first sub-air chamber 310 can communicate with the communication chamber 330. Similarly, the first end (left end) of the second sub-air chamber 320 can also communicate with the communication chamber 330. The communication chamber 330 can extend along the first direction Y, so as to shorten the path of the air flow flowing from the air inlet 110 to the second sub-air chamber 320 and reduce the wind resistance.

[0210] It can be understood that the flow-through area of the first sub-air chamber 310 refers to the area of the cross-section perpendicular to the third direction. The flow-through area of the first sub-air chamber 310 decreases from left to right along the electrode sheet conveying direction. As Figure 8 shown, it can gradually decrease in an inclined plane manner. Similarly, the flow-through area of the second sub-air chamber 320 refers to the area of the cross-section perpendicular to the third direction. The flow-through area of the second sub-air chamber 320 decreases from left to right along the electrode sheet conveying direction. As Figure 8 shown, it can gradually decrease in an inclined plane manner.

[0211] In this embodiment, the shapes of the first sub-air chamber 310 and the second sub-air chamber 320 can be the same.

[0212] Since the air flow is generally transported from left to right along the direction of the electrode transport to each air nozzle 410, the air flow path to the rightmost air nozzle 410 is the longest. By setting the flow area at this position to be smaller, the wind speed can be increased, so that the wind speeds of the air flows blown out by each air nozzle are approximately the same, making the air flow blown out by the blowing part more uniform.

[0213] According to some embodiments of the present application, as Figure 1 shown, the box body 100 has a feeding port 140 and a discharging port 150 oppositely arranged along the electrode transport direction. The feeding port 140 is used to allow the electrode to be dried 20 to enter the box body 100, and the discharging port 150 is used to allow the electrode to be dried 20 after being heated by the infrared heating component 200 to leave the box body 100; a temperature sensor 160 is also arranged in the box body 100. The temperature sensor 160 is arranged at a position in the box body 100 close to the discharging port 150. The temperature sensor 160 is used to detect the temperature of the electrode to be dried 20 at the discharging port 150, and the temperature is used to adjust the heating power of the infrared heating component 100.

[0214] Figure 1 In, it is assumed that the electrode to be dried 20 passes through the box body 100 from left to right. The feeding port 140 is arranged at the left end of the box body 100, and the discharging port 150 is arranged at the right end of the box body 100.

[0215] The temperature sensor 160 can be arranged at a position in the box body 100 close to the discharging port 150. The temperature sensor 160 can be a sensor capable of detecting temperature. For example, it can be an infrared temperature measuring sensor, so that non-contact measurement can be realized.

[0216] The temperature sensor 160 can detect the temperature of the electrode to be dried 20 at the discharging port 150 in real time and adjust the heating power of the infrared heating component according to the temperature.

[0217] It can be understood that when the detected temperature is lower than the preset temperature, the opening degree of the infrared heating component can be increased, so as to increase the heating power. When the detected temperature is higher than the preset temperature, the opening degree of the infrared heating component can be reduced, so as to reduce the heating power.

[0218] Among them, the preset temperature can be a temperature value or a temperature range, which can be the temperature required for drying the electrode, for example, it can be 150°C to 160°C.

[0219] In this embodiment, by arranging a temperature sensor at the discharge port, the heating power of the infrared heating component can be adjusted in real time according to the temperature measured by the temperature sensor, realizing temperature closed-loop control, so that the drying degree can be adjusted in time and the drying effect can be improved. Moreover, arranging a temperature sensor at the discharge port can determine in time the temperature of the part of the to-be-dried electrode sheet about to leave the box body, so as to understand its drying effect in time, making the adjustment of the heating power more targeted and the adjustment effect better.

[0220] According to some embodiments of the present application, such as Figure 1 , a humidity sensor 170 is arranged in the box body 100. The humidity sensor 170 is arranged at a position of the box body 100 close to the air outlet 120. The humidity sensor 170 is used to detect the humidity of the air flow at the air outlet 120, and the humidity is used to adjust the air volume of the air flow.

[0221] The humidity sensor 170 can be arranged in the box body 100 and at a position close to the air outlet 120. In addition, the humidity sensor 170 can be a general sensor capable of detecting humidity.

[0222] The humidity sensor 170 can detect the humidity at the air outlet 120 in real time and adjust the air volume according to the humidity.

[0223] It can be understood that when the detected humidity is higher than the preset humidity, the air volume can be increased. For example, the air volume of the fan used to generate the air flow can be increased, so that more water vapor can be taken away.

[0224] Among them, the preset humidity can be a humidity value or a humidity range, which can be the humidity required to keep the inside of the box body dry and prevent the formation of condensed water.

[0225] In this embodiment, by arranging a humidity sensor at the air outlet, the air volume can be adjusted in real time according to the humidity measured by the humidity sensor, so as to keep the inside of the box body dry and avoid the formation of condensed water. Moreover, arranging a humidity sensor at the air outlet can determine in time the humidity of the air flow about to leave the box body. It can be understood that the humidity of the air flow about to leave the box body can represent the maximum humidity inside the box body. Therefore, by measuring the humidity at the air outlet, the maximum humidity inside the box body can be made not to exceed the preset humidity, so as to better maintain the dryness inside the box body.

[0226] Figure 9 The following is a schematic structural diagram of the coating and drying equipment according to the embodiment of the present application. Please refer to Figure 9 , the embodiment of the present application provides a coating and drying equipment, including a plurality of ovens 10 in any one of the above embodiments. The plurality of ovens 10 are connected in sequence along the electrode sheet conveying direction of the to-be-dried electrode sheet 20.

[0227] Among them, the oven 10 can be the oven 10 in any of the above embodiments. In this embodiment, a plurality of ovens 10 can be connected in sequence along the electrode sheet conveying direction X, and the electrode sheet to be dried can pass through the plurality of ovens 10 in sequence, so as to gradually dry the electrode sheet to be dried through the plurality of ovens, improving the drying effect.

[0228] It can be understood that the coating and drying equipment can also include a coating mechanism and a conveying mechanism. The coating mechanism can coat the active material on the surface of the current collector to form an electrode sheet to be dried, and the conveying mechanism can convey the electrode sheet to be dried to a plurality of ovens for drying.

[0229] In addition, the coating mechanism can be a gravure coating mechanism, and the thickness of the active material coated by the gravure coating mechanism is approximately 0-10 microns. In addition, the coating mechanism can also be other coating mechanisms, such as an extrusion coating mechanism, etc. The coating thickness of these coating mechanisms is relatively thick, approximately 70-200 microns. By directly acting on the inside of the active material through the infrared heating component, comprehensive heating is carried out, and the heating effect is better, which can more obviously reflect the heating advantage of the infrared heating component, further reducing the equipment energy consumption and equipment development cost, and improving the production speed and efficiency.

[0230] In this embodiment, due to having the oven 10 in any of the above embodiments, therefore, the coating and drying equipment also has the advantages of the oven 10. In addition, after canceling the heat-conducting oil heating package and the circulation pipeline, the coating and drying equipment including the oven 10 can be compressed by more than 17% in the width direction (the first direction Y), and due to the improvement of the drying efficiency, the evaporation efficiency of steam and other gases is improved, and the equipment can be compressed by more than 25% in the length direction (the electrode sheet conveying direction X). Therefore, the space occupied by the entire equipment can be reduced by more than 35%, and the equipment manufacturing cost can be reduced by more than 7.8%.

[0231] Figure 10 is Figure 9 a schematic structural diagram of the heat exchanger in the middle. According to some embodiments of the present application, please refer to Figure 9 and Figure 10 , the coating and drying equipment further includes: a heat exchanger 30. The heat exchanger 30 has a first channel 31 and a second channel 32 that are isolated from each other. The first channel 31 is communicated with the air inlet 110 of the oven 10, and the second channel 32 is communicated with the air outlet 120 of the oven 10. The heat exchanger 30 is used for exchanging heat between the air flow in the first channel 31 and the air flow in the second channel 32.

[0232] In this embodiment, the first channel 31 can be directly communicated with the air inlet 110, or can be indirectly communicated with the air inlet 110 through a pipeline. Similarly, the second channel 32 can be directly communicated with the air outlet 120, or can be indirectly communicated with the air outlet 120 through a pipeline.

[0233] In addition, the first channel 31 and the second channel can be isolated from each other and not connected. Moreover, the direction of the air flow in the first channel 31 is opposite to that in the second channel, so that heat exchange can be achieved through convection.

[0234] It can be understood that the air flow blown out by the blowing part 400 will also pass between the infrared heating component and the polar plate to be dried, and its temperature will also increase. For example, it can increase by at least more than 10°C. Generally speaking, the temperature of the air flow at the air inlet is 20°C - 30°C, and the temperature of the air flow at the air outlet is approximately 60°C - 80°C. That is to say, the temperature of the air flow at the air outlet 120 can be higher than that at the air inlet 110. After heat exchange through the heat exchanger 30, the temperature of the air flow in the first channel 31 can be 40°C - 50°C, and the temperature of the air flow in the second channel 32 can be 50°C - 60°C, and the heat exchange efficiency can reach about 70%.

[0235] In this embodiment, through the heat exchanger, the inlet air temperature can be increased, so that more water vapor can be taken away, the drying effect is better, and the temperature of the box body 100 can be increased, which can reduce the formation of condensed water. In addition, the outlet air temperature can be reduced. Even if positive pressure occurs in the box body, resulting in air flow leakage to the outside of the box body, since the air flow temperature is relatively low, it will not scald the on-site personnel, improving production safety.

[0236] According to some embodiments of the present application, continue to refer to Figure 9 , the coating and drying equipment further includes a total inlet air pipe 40 and a total outlet air pipe 50; the total inlet air pipe 40 extends along the polar plate conveying direction, and the air inlet 110 of the oven 10 is communicated with the total inlet air pipe 40. The total outlet air pipe 50 extends along the polar plate conveying direction, and the air outlet 120 of the oven 10 is communicated with the total outlet air pipe 50. The total inlet air pipe 40 and the total outlet air pipe 50 are arranged in a direction perpendicular to the polar plate to be dried.

[0237] In this embodiment, multiple ovens 10 can have multiple air inlets 110, and the multiple air inlets 110 can be connected in parallel and all communicated with the total inlet air pipe 40. Similarly, multiple ovens 10 can have multiple air outlets 120, and the multiple air outlets 120 can be connected in parallel and all connected to the total outlet air pipe 50.

[0238] As Figure 9 , both the total outlet air pipe 50 and the total inlet air pipe 40 can extend along the polar plate conveying direction. In addition, the total inlet air pipe 40 and the total outlet air pipe 50 are arranged in a direction perpendicular to the polar plate to be dried, that is, perpendicular to Figure 9 the plane of the paper. It can be understood that this direction can be the second direction Z. In this embodiment, the XY plane can be the horizontal plane, the second direction Z can be the vertical direction, the coating and drying equipment can be arranged on the horizontal plane, and the total inlet air pipe 40 and the total outlet air pipe 50 can be arranged in the vertical direction.

[0239] In some embodiments, the heat exchanger 30 may be located at one end of the main outlet air duct 50, and it may also be connected to the fan 60. The fan 60 can be used to form an air current, thereby controlling the magnitude of the air current.

[0240] In this embodiment, by arranging the main inlet air duct and the main outlet air duct vertically, the floor space occupied by the equipment can be reduced, and the volume of the equipment can be minimized.

[0241] In one embodiment, as Figures 1 to 9 shown, the coating and drying equipment includes more than 3 sections of ovens 10. Each oven 10 has an air inlet 110 and an air outlet 120. A plurality of air inlets 110 are separately connected in parallel, and a plurality of air outlets 120 are separately connected in parallel. By controlling the fan 60, the air velocity and air volume can be controlled. The fan 60 can send the dry air current into the oven 10 through the air inlet 110, and take away water vapor and other gaseous substances and discharge them from the air outlet 120.

[0242] An infrared heating component 200 and a air supply chamber 300 are arranged inside the box body 100 of the oven 10. The air supply chamber 300 is connected with a blowing part 400. The blowing part 400 includes a plurality of air nozzles 410. The infrared heating component 200 includes a plurality of heating elements 210. Since the drying effect of the infrared heating component is better than that of the hot air heating in the related art, the air current is reduced from 150°C - 160°C required in the related art to a conventional temperature. Thus, the heat conduction oil heating package and the circulation pipeline can be cancelled, reducing the heat conduction oil energy consumption for heating the air current. And after cancelling the circulating air, it is no longer necessary to control the negative pressure of the air path to maintain the stability of the circulating air, and the air path is simpler and easier to operate.

[0243] As Figure 1 shown, the polar plate to be dried can enter from the feeding port 140 on the left side of the oven 10. The conveying component 500 can provide power. Alternately distributed air nozzles 410 and heating elements 210 are arranged inside the box body 100. The heating element 210 can be a graphene heating plate. The air nozzles 410 can blow out air evenly. After the heating elements on both sides are powered on, the graphene nano-coating on the surface will quickly heat up, thereby radiating infrared rays outward and transferring heat. As an electromagnetic wave, the wavelength range of the infrared rays conforms to the fixed absorption wavelength of substances such as water that need to be absorbed. The active material on the polar plate 20 to be dried can absorb the energy of the infrared rays, and resonance occurs between the internal molecules and atoms, thereby generating heat and quickly drying the polar plate 20 to be dried.

[0244] In some embodiments, the optimal heating distance L2 between the heating element 210 and the polar plate 20 to be dried is 10 mm - 15 mm. And the heating element 210 can be connected to the air supply chamber 300 through an adjustable bracket 230, so as to conveniently adjust the optimal heating distance to achieve the best heating effect.

[0245] Meanwhile, the air supply chamber 300 may include a first sub-air chamber 310, a second sub-air chamber 320, and a connecting chamber 330 connecting the first sub-air chamber 310 and the second sub-air chamber 320. The first sub-air chamber 310, the second sub-air chamber 320, and the connecting chamber 330 may be provided with a flow guiding structure. By controlling the flow areas of the first sub-air chamber 310 and the second sub-air chamber 320, the air outlet speeds of each air nozzle are made consistent, and the air flow can be uniformly output to the air nozzles and evenly blown onto the surface of the to-be-dried electrode sheet 20, taking away the evaporated gaseous water and other substances, and then leaving the box body through the air outlet.

[0246] The to-be-dried electrode sheet may be continuously dried in sequence through 3 or more sections of the oven 10, and after being completely dried, it may be conveyed from the discharge port 150 of the outermost oven 10 to the next process.

[0247] In this embodiment, since the hot air drying in the related art is replaced by infrared drying, the heat utilization rate is high, and the inside of the to-be-dried electrode sheet can be quickly and deeply heated, improving the drying speed. Compared with the hot air drying in the related art, the system energy consumption can be reduced by more than 37.5%. It can be understood that pole ear glue needs to be provided on both sides of the pole ears of some electrode sheets. In the hot air drying method in the related art, the pole ear glue dries slowly and is prone to sticking to the roller. However, in this embodiment, through the infrared drying method, the pole ear glue can be quickly dried, the coating speed of the coating and drying equipment can be improved, and the bottleneck of production capacity is improved.

[0248] In addition, the coating and drying equipment provided in this embodiment can remove the circulation pipeline. The air flow can enter the air supply chamber 300 from the air inlet 110, and uniformly discharge air through the air nozzles 410 above the to-be-dried electrode sheet 20, and then take away the evaporated water vapor through the air outlet, optimizing the air path structure. Moreover, the air nozzles can uniformly blow air from top to bottom along the second direction Z, with uniform air outlet, uniform and stable force on the to-be-dried electrode sheet, small probability of jitter, and high coating stability.

[0249] In this embodiment, the to-be-dried electrode sheet is dried by the infrared heating component. Compared with the circulating hot air heating in the related art, the heating method is converted from heat convection to heat radiation. The heat can directly act on the active material (slurry) on the to-be-dried electrode sheet, deeply heating the inside, with high energy utilization rate and high drying efficiency. The drying speed can be increased by more than 25%. Moreover, due to the high energy utilization rate, the heating temperature of the infrared heating component can reach the temperature required for drying (for example, 150°C to 160°C), and there is no need to rely on the heat of the circulating air in the related art to ensure the drying efficiency and maintain the temperature inside the box. Therefore, the air volume required inside the box can be reduced (by about 80%), and there is no need to heat the air flow through the heat transfer oil heating package. Only the infrared heating component and the normal-temperature air flow can achieve an efficient drying effect, thereby significantly reducing the energy consumption (by more than 40%).

[0250] Meanwhile, the normal-temperature air flow can enter the box body from the air inlet and leave the box body from the air outlet without circulation. The heat-conducting oil heating pack and the circulation pipeline in the related technology can be cancelled, optimizing the air duct structure, reducing the structural complexity and volume of the equipment, reducing the manufacturing cost, and also eliminating the need to ensure the stability of the circulating air duct, the incoming air, and the exhaust air simultaneously as in the related technology, and there is no need to adjust the negative pressure. Thus, the control difficulty can be reduced, the debugging time can be shortened, and the stability of the air duct can be improved. In addition, in the related technology, when the oven device starts up, shuts down abnormally, such as during the cutting, pulling, first-piece inspection, or abnormal shutdown of the polar plates to be dried, it takes a long time to wait for the equipment to heat up and cool down. In the embodiment of the present application, by using the infrared heating component, the heating up and cooling down can be achieved quickly. The original start-up heating time of 30 minutes can be compressed to about 5 minutes, and the original abnormal shutdown cooling time of about 2 hours can be compressed to about half an hour.

[0251] In the related technology, when heating with hot air, all positions on the polar plate will be evenly heated, but the tab position is prone to heat softening and wrinkling, resulting in risks such as tape breakage, tab marking, and winding rejection. However, the infrared heating method provided in the embodiment of the present application can directly act on the active material (slurry), and the heat absorption range is controlled within the active material range. Due to the mirror reflection and poor silver heat absorption effect at the tab position, the temperature is lower than that of the active material position. The tab is less affected by infrared rays and is not easily softened by high temperature, reducing the risk of high-temperature wrinkling of the tab.

[0252] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An oven, characterized in that, Comprising: A box body having an air inlet and an air outlet; An infrared heating component disposed inside the box body, and the infrared heating component is used to emit infrared rays to heat the to-be-dried electrode sheet conveyed into the box body along the electrode sheet conveying direction; A blowing chamber disposed inside the box body, and the blowing chamber is communicated with the air inlet. The blowing chamber includes a first sub-air chamber, a second sub-air chamber, and a communication chamber communicating the first sub-air chamber and the second sub-air chamber. The blowing chamber is provided with a blowing portion for blowing towards the to-be-dried electrode sheet, and the blowing portion is disposed in at least one of the first sub-air chamber and the second sub-air chamber; The air inlet is used to convey air flow into the blowing chamber, so that the air flow can be blown towards the to-be-dried electrode sheet through the blowing portion and leave the box body through the air outlet.

2. The oven according to claim 1, wherein: The infrared heating component includes a plurality of heating elements arranged at intervals along the electrode sheet conveying direction. Each heating element extends along a first direction perpendicular to the electrode sheet conveying direction, and the heating element has a heating surface for facing the to-be-dried electrode sheet, and the heating surface is used to emit the infrared rays.

3. The oven according to claim 2, wherein: A bracket is disposed inside the box body, the heating element is connected to the bracket, and the heating element can move relative to the bracket along a second direction to adjust the distance between the heating element and the to-be-dried electrode sheet; Wherein, the first direction, the electrode sheet conveying direction, and the second direction are perpendicular to each other in pairs.

4. The oven according to claim 2, wherein: The heating element includes a base body connected inside the box body and a heating layer disposed on one side of the base body. The surface of the heating layer facing away from the base body constitutes the heating surface of the heating element.

5. The oven according to claim 2, wherein: The minimum distance L1 between two adjacent heating elements in the electrode sheet conveying direction satisfies: 100mm ≤ L1 ≤ 200mm.

6. The oven according to claim 2, wherein: The distance L2 between the heating surface of the heating element and the to-be-dried electrode sheet in the second direction satisfies: 10mm ≤ L2 ≤ 15mm; Wherein, the first direction, the electrode sheet conveying direction, and the second direction are perpendicular to each other in pairs.

7. The oven according to claim 1, characterized in that, The blowing chamber has a first bottom wall for facing the to-be-dried electrode sheet, and the infrared heating component is connected to the outer surface of the first bottom wall facing away from the blowing chamber.

8. The oven according to claim 2, wherein: The blowing portion is connected to the first bottom wall of the blowing chamber facing the to-be-dried electrode sheet. The blowing portion includes a plurality of air nozzles arranged at intervals along the electrode sheet conveying direction. The air nozzles extend along a first direction perpendicular to the electrode sheet conveying direction, and there is one heating element disposed between two adjacent air nozzles.

9. The oven according to claim 8, wherein: The air nozzle includes a first section connected to the first bottom wall and a second section connected to the first section and facing away from the first bottom wall; The first section communicates with the air supply chamber through a plurality of first through holes. The second section communicates with the first section through a plurality of second through holes. An end of the second section facing away from the first section has a holding section, and the flow-through area of the holding section is equal everywhere. The flow-through area S1 of the holding section and the flow-through area S2 of one end of the second section close to the first section satisfy: S1 < S2.

10. The oven according to claim 9, characterized in that, An end of the holding section facing away from the first section is further provided with a folding section parallel to the first bottom wall, and the folding section is arranged on both sides of the holding section along the pole piece conveying direction.

11. The oven according to claim 8, wherein The distance L3 between two adjacent air nozzles in the pole piece conveying direction satisfies: 400 mm ≤ L3 ≤ 500 mm.

12. The oven according to claim 8, wherein The air outlet direction of the air nozzle is parallel to the second direction; or, the air outlet direction of the air nozzle is inclined relative to the second direction; Wherein, the first direction, the pole piece conveying direction, and the second direction are perpendicular to each other in pairs.

13. The oven according to claim 8, characterized in that, The oven further comprises: A conveying assembly, the conveying assembly includes a plurality of idler rollers arranged at intervals along the pole piece conveying direction, the idler rollers extend along the first direction, and the idler rollers are used to carry and convey the pole pieces to be dried; And each air nozzle is arranged corresponding to one idler roller along the second direction; Wherein, the first direction, the pole piece conveying direction, and the second direction are perpendicular to each other in pairs.

14. The oven according to claim 13, wherein Among the plurality of air nozzles, the first distance between each air nozzle and the corresponding idler roller in the second direction is equal.

15. The oven according to claim 13, wherein The box body has a second bottom wall perpendicular to the second direction, the conveying assembly is located between the second bottom wall and the air supply chamber, and the second distance between the plurality of idler rollers and the second bottom wall gradually decreases from the middle to both ends along the pole piece conveying direction.

16. The oven according to any one of claims 1-15, wherein Both the first sub-air chamber and the second sub-air chamber extend along the pole piece conveying direction, and the first sub-air chamber and the second sub-air chamber are arranged at intervals along a first direction perpendicular to the pole piece conveying direction. One end of the first sub-air chamber facing away from the second sub-air chamber communicates with the air inlet; the first sub-air chamber has a third bottom wall facing the pole pieces to be dried, the second sub-air chamber has a fourth bottom wall facing the pole pieces to be dried, and the blowing part is arranged on the third bottom wall and the fourth bottom wall.

17. The oven according to claim 16, wherein The air inlet communicates with the first end of the first sub-air chamber along a third direction parallel to the pole piece conveying direction. The communication chamber extends along the first direction, and one end of the communication chamber communicates with the first end of the first sub-air chamber, and the other end of the communication chamber communicates with the first end of the second sub-air chamber along the third direction; And in the third direction, the flow-through area of the first sub-air chamber decreases from the end close to the communication chamber to the end away from the communication chamber, and the flow-through area of the second sub-air chamber decreases from the end close to the communication chamber to the end away from the communication chamber.

18. The oven according to any one of claims 1-15, characterized in that the air flow blown by the blowing part towards the to-be-dried electrode sheet can flow towards the air outlet through the gap between the inner wall of the box body and the air supply chamber.

19. The oven according to any one of claims 1-15, characterized in that the temperature T1 of the air flow at the air inlet satisfies: 20°C ≤ T1 ≤ 30°C.

20. The oven according to any one of claims 1-15, characterized in that the box body has a feed port and a discharge port oppositely arranged along the electrode sheet conveying direction. The feed port is used to allow the to-be-dried electrode sheet to enter the box body, and the discharge port is used to allow the to-be-dried electrode sheet heated by the infrared heating component to leave the box body; a temperature sensor is further arranged in the box body. The temperature sensor is arranged at a position of the box body close to the discharge port. The temperature sensor is used to detect the temperature of the to-be-dried electrode sheet at the discharge port, and the temperature is used to adjust the heating power of the infrared heating component.

21. The oven according to any one of claims 1-15, characterized in that a humidity sensor is arranged in the box body. The humidity sensor is arranged at a position of the box body close to the air outlet. The humidity sensor is used to detect the humidity of the air flow at the air outlet, and the humidity is used to adjust the air volume of the air flow.

22. A coating and drying device, characterized in that, Including a plurality of ovens according to any one of claims 1-21, and the plurality of ovens are sequentially connected along the electrode sheet conveying direction of the to-be-dried electrode sheet.

23. The coating and drying equipment according to claim 22, characterized in that, The coating drying equipment further includes: a heat exchanger, which has a first channel and a second channel isolated from each other. The first channel is communicated with the air inlet of the oven, and the second channel is communicated with the air outlet of the oven. The heat exchanger is used to exchange heat between the air flow in the first channel and the air flow in the second channel.

24. The coating and drying equipment according to claim 22 or 23, characterized in that, The coating drying equipment further includes a total air inlet pipe and a total air outlet pipe; the total air inlet pipe extends along the electrode sheet conveying direction, and the air inlet of the oven is communicated with the total air inlet pipe. The total air outlet pipe extends along the electrode sheet conveying direction, and the air outlet of the oven is communicated with the total air outlet pipe. The total air inlet pipe and the total air outlet pipe are arranged along a direction perpendicular to the to-be-dried electrode sheet.

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