Drying apparatus and electrode sheet manufacturing system

Abstract

The present application relates to the field of batteries. Provided are a drying apparatus and an electrode sheet manufacturing system. The drying apparatus comprises a housing and a drying device, the housing being provided with a drying cavity, the drying cavity being provided with a material strip inlet and a material strip outlet, and the drying device being arranged inside the drying cavity. The drying device comprises a first drying module, a second drying module and a conveying mechanism; the first drying module and the second drying module are used for drying material strips; the conveying mechanism is used for conveying the material strips, so that the material strips, from the material strip inlet, sequentially pass the first drying module, the second drying module and the material strip outlet; and the drying temperature of the first drying module is higher than the drying temperature of the second drying module. The drying apparatus is provided with the first drying module and the second drying module and the drying temperature of the first drying module is higher than the drying temperature of the second drying module; after entering the drying cavity through the material strip inlet, material strips are first rapidly dried at a high temperature by the first drying module and then are continuously dried by the second drying module, thereby improving the drying efficiency and achieving better drying quality.

Description

Drying equipment and electrode manufacturing system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application entitled “Drying Equipment and Electrode Manufacturing System” filed on November 14, 2023 (Application Number: 2023115161895), the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and more specifically, to a drying device and a pole piece manufacturing system. Background Art

[0004] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. Pole sheet manufacturing is a crucial step in battery manufacturing. This typically involves coating an active material layer on a current collector. This layer then needs to be dried in drying equipment. However, current drying equipment has low drying efficiency.

[0005] Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a drying device and an electrode manufacturing system, which aims to improve the problem of low drying efficiency of the drying equipment in the related art.

[0007] In the first aspect, an embodiment of the present application provides a drying device, which includes a shell and a drying device, the shell having a drying chamber, the drying chamber having a material belt inlet and a material belt outlet; the drying device is arranged in the drying chamber, and the drying device includes a first drying module, a second drying module and a conveying mechanism, the first drying module and the second drying module are used to dry the material belt, and the conveying mechanism is used to convey the material belt so that the material belt passes through the first drying module, the second drying module and the material belt outlet in sequence from the material belt inlet, and the drying temperature of the first drying module is greater than the drying temperature of the second drying module.

[0008] In the above technical solution, the drying equipment is provided with a first drying module and a second drying module, wherein the drying temperature of the first drying module is greater than the drying temperature of the second drying module. After the material strip enters the drying chamber from the material strip inlet, it is first dried quickly and at high temperature by the first drying module, and then continuously dried by the second drying module. In this way, not only can the drying efficiency be improved, but also the drying quality is better.

[0009] As an optional technical solution of an embodiment of the present application, the first drying module extends along a first direction, the second drying module includes multiple drying sections, the multiple drying sections are arranged along the first direction, the material belt passes around the multiple drying sections in sequence, and the drying sections are used to dry the material belt.

[0010] In the above technical solution, by setting up multiple drying sections and allowing the material belt to bypass the multiple drying sections in sequence, the space in the drying chamber is effectively utilized, the extension length of the material belt in the drying chamber is extended, and the multiple drying sections jointly dry the material belt, thereby improving the drying effect.

[0011] As an optional technical solution of the embodiment of the present application, along the second direction, the drying part is located at the bottom of the first drying module, and the second direction intersects with the first direction.

[0012] In the above technical solution, the drying part is located at the bottom of the first drying module along the second direction, which can fully utilize the space of the drying chamber in the second direction and reduce the volume occupied by the drying equipment in the first direction.

[0013] As an optional technical solution of an embodiment of the present application, the drying equipment also includes a third drying module. Along the conveying direction of the conveying mechanism, the third drying module is located downstream of the second drying module. The drying temperature of the third drying module is lower than the drying temperature of the second drying module. Along the second direction, the third drying module is located at the bottom of the drying section.

[0014] In the above technical solution, by providing a third drying module with a lower drying temperature than the second drying module, the material strip passes through the first, second, and third drying modules in sequence, achieving a better drying effect. Furthermore, the third drying module is closer to the strip exit than the second drying module. The third drying module dries the strip at a lower temperature, lowering its temperature to near the ambient temperature outside the drying equipment. This minimizes the temperature difference between the strip before and after leaving the drying equipment, reducing the risk of the strip buckling due to a sudden drop in temperature.

[0015] As an optional technical solution of an embodiment of the present application, the conveying mechanism includes multiple top winding mechanisms and multiple bottom winding mechanisms, and the multiple top winding mechanisms and the multiple bottom winding mechanisms are arranged along the first direction. Along the second direction, the top winding mechanism is located at the top of the drying section, and the bottom winding mechanism is located at the bottom of the drying section; the material belt alternately wraps around the top winding mechanism and the bottom winding mechanism.

[0016] In the above technical solution, by setting up multiple top winding mechanisms and multiple bottom winding mechanisms, and making the material belt alternately bypass the top winding mechanism and the bottom winding mechanism, the material belt forms a curved extension path in the drying chamber, extending the extension length of the material belt in the drying chamber, making it easier for multiple drying sections to jointly dry the material belt, thereby improving the drying effect.

[0017] As an optional technical solution of an embodiment of the present application, at least one of the top winding mechanisms includes a plurality of first rollers arranged at intervals along an arc-shaped trajectory, and the first rollers are used for winding the material strip.

[0018] In the above technical solution, by providing multiple first rollers, each of which contacts the wound web, the total contact area between the multiple first rollers and the web is increased, making the web less susceptible to wrinkling and deviation. Furthermore, by spacing the multiple first rollers along an arcuate trajectory, the web's gravity is not entirely concentrated on a single first roller, but rather distributed across multiple first rollers. This reduces the web tension between adjacent first rollers, making it less susceptible to wrinkling or breakage.

[0019] As an optional technical solution of an embodiment of the present application, at least one of the bottom winding mechanisms includes a heating roller for winding the material strip, and the heating roller is used to heat and dry the material strip.

[0020] In the above technical solution, by providing a heating roller, the heating roller can not only play the role of conveying the material belt, but also heat and dry the material belt, which is beneficial to improving the drying efficiency.

[0021] As an optional technical solution of an embodiment of the present application, the conveying mechanism also includes a side winding mechanism. Along the first direction, the side winding mechanism is provided on at least one side of the drying section, and the material belt sequentially winds around the top winding mechanism, the side winding mechanism and the bottom winding mechanism.

[0022] In the above technical solution, by providing a side winding mechanism, the weight of the material strip is distributed to the side winding mechanism, reducing the risk of the material strip being subjected to excessive tension due to its own weight, making the material strip less likely to wrinkle or break. In addition, by providing a side winding mechanism and allowing the material strip to pass through the top winding mechanism, the side winding mechanism, and the bottom winding mechanism in sequence, the material strip receives more support, reducing the risk of the material strip shaking under external forces.

[0023] As an optional technical solution of an embodiment of the present application, the side winding mechanism includes at least one second roller for winding the material strip.

[0024] In the above technical solution, the second roller feeding belt is provided for winding, which is simple, convenient and low-cost.

[0025] As an optional technical solution of an embodiment of the present application, the conveying mechanism includes a heating roller for the material belt to be wound around, and the heating roller is used to heat and dry the material belt.

[0026] In the above technical solution, by providing a heating roller, the heating roller can not only play the role of conveying the material belt, but also heat and dry the material belt, which is beneficial to improving the drying efficiency.

[0027] As an optional technical solution of the embodiment of the present application, the first drying module is an infrared drying module, and the second drying module is a hot air drying module.

[0028] In the above technical solution, when the strip first enters the drying chamber, the active material layer contains a high amount of moisture, and the strip's own gravity is high, making it more likely to vibrate when subjected to external forces. Therefore, the strip is dried using an infrared drying module, which does not apply force to the strip, thereby reducing the risk of vibrating. The hot air drying module generates hot air to dry the strip, providing more uniform drying and improving drying quality.

[0029] As an optional technical solution of an embodiment of the present application, the drying equipment also includes a third drying module. Along the conveying direction of the conveying mechanism, the third drying module is located downstream of the second drying module, and the drying temperature of the third drying module is lower than the drying temperature of the second drying module.

[0030] In the above technical solution, by providing a third drying module with a lower drying temperature than the second drying module, the material strip passes through the first, second, and third drying modules in sequence, achieving a better drying effect. Furthermore, the third drying module is closer to the strip exit than the second drying module. The third drying module dries the strip at a lower temperature, lowering its temperature to near the ambient temperature outside the drying equipment. This minimizes the temperature difference between the strip before and after leaving the drying equipment, reducing the risk of the strip buckling due to a sudden drop in temperature.

[0031] As an optional technical solution of the embodiment of the present application, the third drying module is an infrared drying module.

[0032] In the above technical solution, an infrared drying module is used for low-temperature drying. The drying temperature is easy to control, the drying cost is low, and the drying is not easily disturbed by external airflow, thereby achieving a better drying effect.

[0033] As an optional technical solution of the embodiment of the present application, the shell has two independent drying chambers, the two drying chambers are arranged along the direction of gravity, and the drying device is provided in each drying chamber.

[0034] In the above technical solution, by providing two drying chambers, one drying chamber can be used to dry one side of the material strip, and the other drying chamber can be used to dry the other side of the material strip, thereby improving the drying effect of the material strip. By arranging the two drying chambers along the direction of gravity, the space in the direction of gravity is effectively utilized, reducing the floor space of the drying equipment.

[0035] As an optional technical solution of an embodiment of the present application, along a first direction, the shell has a first side and a second side relative to each other, the first direction intersects with the direction of gravity, the material belt inlet of one drying chamber and the material belt outlet of another drying chamber are located on the first side, and the material belt outlet of one drying chamber and the material belt inlet of another drying chamber are located on the second side.

[0036] In the above technical solution, by locating the material belt inlet of one drying chamber and the material belt outlet of another drying chamber on the first side, and the material belt outlet of one drying chamber and the material belt inlet of another drying chamber on the second side, after the material belt is output from the material belt outlet of one drying chamber, it can turn to enter the other drying chamber from the material belt inlet of another drying chamber, which is simple and fast and reduces the transportation of the material belt.

[0037] In the second aspect, an embodiment of the present application also provides a pole piece manufacturing system, which includes pole piece manufacturing equipment and the above-mentioned drying equipment, the pole piece manufacturing equipment is used to manufacture pole pieces, the drying equipment is arranged downstream of the pole piece manufacturing equipment, and the drying equipment is used to dry the pole pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0039] FIG1 is a schematic diagram of the internal structure of a drying device provided in some embodiments of the present application;

[0040] FIG2 is a schematic diagram of the internal structure of a drying device provided in some other embodiments of the present application;

[0041] FIG3 is a schematic diagram of the internal structure of a drying device provided in some other embodiments of the present application;

[0042] FIG4 is a schematic diagram of the internal structure of a drying device provided in some other embodiments of the present application;

[0043] FIG5 is a schematic diagram of the internal structure of a drying device provided in some embodiments of the present application.

[0044] Icons: 10-drying equipment; 11-shell; 111-drying chamber; 112-material belt inlet; 113-material belt outlet; 12-drying device; 121-first drying module; 122-second drying module; 1221-drying section; 13-conveyance mechanism; 131-top winding mechanism; 1311-first roller; 132-bottom winding mechanism; 1321-heating roller; 133-side winding mechanism; 1331-second roller; 14-third drying module; 20-material belt. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0047] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0049] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. 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 application generally indicates that the related objects are in an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0051] The term "plurality" used in this application refers to two or more (including two).

[0052] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0053] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing for enclosing one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0054] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer protrudes from the portion coated with the positive active material layer. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure high current flow without melting, multiple positive tabs are stacked together, and multiple negative tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the present invention is not limited thereto.

[0055] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0056] Pole sheet manufacturing is an important part of battery manufacturing. During pole sheet manufacturing, an active material layer is usually coated on the current collector. The coated active material layer needs to be dried by drying equipment. However, the drying efficiency of current drying equipment is relatively low.

[0057] In the prior art, hot air drying is generally used to dry the electrode. However, the drying temperature of the hot air drying is the same near the electrode inlet and the electrode outlet, which takes a long time to dry the electrode and is inefficient.

[0058] In view of this, an embodiment of the present application provides a drying device, comprising a housing and a drying device. The housing has a drying chamber, the drying chamber having a material belt inlet and a material belt outlet, and the drying device is disposed within the drying chamber. The drying device includes a first drying module, a second drying module, and a conveying mechanism. The first and second drying modules are used to dry the material belt, and the conveying mechanism is used to convey the material belt so that the material belt passes through the first drying module, the second drying module, and the material belt outlet in sequence from the material belt inlet. The drying temperature of the first drying module is higher than that of the second drying module.

[0059] The drying equipment is provided with a first drying module and a second drying module, wherein the drying temperature of the first drying module is greater than the drying temperature of the second drying module. After the material strip enters the drying chamber from the material strip inlet, it is first dried quickly and at high temperature by the first drying module, and then continuously dried by the second drying module. In this way, not only the drying efficiency can be improved, but also the drying quality can be better.

[0060] The technical solution described in the embodiment of the present application is applicable to drying a material strip, which may be a pole piece. The material strip is dried using the drying equipment provided in the embodiment of the present application, which has a high drying efficiency.

[0061] Please refer to Figure 1, which is a schematic diagram of the internal structure of a drying device 10 provided in some embodiments of the present application. The embodiments of the present application provide a drying device 10, which includes a housing 11 and a drying device 12. The housing 11 has a drying chamber 111, and the drying chamber 111 has a material belt inlet 112 and a material belt outlet 113. The drying device 12 is disposed within the drying chamber 111. The drying device 12 includes a first drying module 121, a second drying module 122, and a conveying mechanism 13. The first drying module 121 and the second drying module 122 are used to dry the material belt 20. The conveying mechanism 13 is used to convey the material belt 20 so that the material belt 20 passes through the first drying module 121, the second drying module 122, and the material belt outlet 113 in sequence from the material belt inlet 112. The drying temperature of the first drying module 121 is greater than the drying temperature of the second drying module 122.

[0062] The housing 11 is the outer shell of the drying device 10 and provides a mounting base for the various components of the drying device 10. A chamber is formed within the housing 111 for accommodating the drying device 12. The drying chamber 111 has a material inlet 112 and a material outlet 113. The material inlet 112 allows the material belt 20 to enter the drying chamber 111, while the material outlet 113 allows the material belt 20 to exit the drying chamber 111.

[0063] The first drying module 121 and the second drying module 122 are the main functional modules that implement the drying function of the drying device 12. The first drying module 121 and the second drying module 122 are both used to dry the material strip 20. The structure of the first drying module 121 can be the same as or different from the structure of the second drying module 122. The first drying module 121 and the second drying module 122 can be electric heating modules, infrared drying modules, hot air drying modules, etc.

[0064] The first drying module 121 is closer to the material belt inlet 112 than the second drying module 122 , and the second drying module 122 is closer to the material belt outlet 113 than the first drying module 121 . The drying temperature of the first drying module 121 is higher than that of the second drying module 122 .

[0065] The conveyor mechanism 13 is used to convey the material strip 20. Under the action of the conveyor mechanism 13, the material strip 20 can pass through the first drying module 121, the second drying module 122, and the material strip outlet 113 in sequence from the material strip inlet 112. During the process of conveying the material strip 20 by the conveyor mechanism 13, the first drying module 121 and the second drying module 122 dry the material strip 20.

[0066] The drying equipment 10 is provided with a first drying module 121 and a second drying module 122, wherein the drying temperature of the first drying module 121 is greater than the drying temperature of the second drying module 122. After the material strip 20 enters the drying chamber 111 from the material strip inlet 112, it is first dried quickly and at high temperature by the first drying module 121, and then continuously dried by the second drying module 122. In this way, not only can the drying efficiency be improved, but also the drying quality is better.

[0067] Referring to FIG. 1 , in some embodiments, a first drying module 121 extends along a first direction. A second drying module 122 includes a plurality of drying sections 1221 arranged along the first direction. The material strip 20 sequentially passes through the plurality of drying sections 1221, which are used to dry the material strip 20.

[0068] The first direction is the extension direction of the first drying module 121, that is, the length direction of the first drying module 121. Referring to Figure 1, the first direction may be the X direction shown in the figure.

[0069] The second drying module 122 includes multiple drying sections 1221, which are arranged in the same direction as the first drying module 121. The drying sections 1221 can dry the material strip 20, and the material strip 20 passes through the multiple drying sections 1221 in sequence. In this way, the multiple drying sections 1221 can jointly dry the material strip 20.

[0070] By setting up multiple drying sections 1221 and allowing the material strip 20 to pass through the multiple drying sections 1221 in sequence, the space in the drying chamber 111 is effectively utilized, the extension length of the material strip 20 in the drying chamber 111 is extended, and the multiple drying sections 1221 jointly dry the material strip 20, thereby improving the drying effect.

[0071] 1 , in some embodiments, along the second direction, the drying portion 1221 is located at the bottom of the first drying module 121. The second direction intersects with the first direction.

[0072] The angle between the second direction and the first direction can be an acute angle or a right angle. Referring to FIG1 , the second direction can be the Y direction shown in the figure, in which case the first direction and the second direction are perpendicular.

[0073] The drying portion 1221 is located at the bottom of the first drying module 121 along the second direction. Referring to FIG. 1 , in the figure, the drying portion 1221 is located below the first drying module 121 along the second direction.

[0074] The drying portion 1221 is located at the bottom of the first drying module 121 along the second direction, which can fully utilize the space of the drying chamber 111 in the second direction and reduce the volume occupied by the drying device 10 in the first direction.

[0075] Please refer to Figure 2, which is a schematic diagram of the internal structure of a drying device 10 according to other embodiments of the present application. In other embodiments, the drying device 10 further includes a third drying module 14, which is located downstream of the second drying module 122 along the conveying direction of the conveying mechanism 13. The drying temperature of the third drying module 14 is lower than that of the second drying module 122. Along the second direction, the third drying module 14 is located at the bottom of the drying section 1221.

[0076] The third drying module 14 is used to dry the material strip 20. It is located closer to the material strip exit 113 than the second drying module 122. Under the action of the conveyor mechanism 13, the material strip 20 enters the drying chamber 111 from the material strip entrance 112 and passes through the first drying module 121, the second drying module 122, the third drying module 14, and the material strip exit 113. The structure of the third drying module 14 can be the same as or different from that of the first drying module 121 and / or the second drying module 122. The third drying module 14 can be an electric heating module, an infrared drying module, a hot air drying module, or the like.

[0077] The drying temperature of the first drying module 121 is greater than the drying temperature of the second drying module 122 , and the drying temperature of the second drying module 122 is greater than the drying temperature of the third drying module 14 .

[0078] The third drying module 14 is located at the bottom of the drying section 1221 along the second direction. Please refer to Figure 2. In the figure, the third drying module 14 is located below the drying section 1221 along the second direction, that is, along the second direction, the second drying module 122 is located between the first drying module 121 and the second drying module 122.

[0079] By providing the third drying module 14, whose drying temperature is lower than that of the second drying module 122, the material strip 20 is dried sequentially through the first drying module 121, the second drying module 122, and the third drying module 14, achieving a better drying effect. Furthermore, the third drying module 14 is closer to the material strip exit 113 than the second drying module 122. The third drying module 14 dries the material strip 20 at a low temperature, causing the temperature of the material strip 20 to drop, approaching the ambient temperature outside the drying apparatus 10. This minimizes the temperature difference between the material strip 20 before and after it leaves the drying apparatus 10, reducing the risk of the material strip 20 buckling due to a sudden drop in temperature.

[0080] Referring to Figure 2 , in some embodiments, the conveying mechanism 13 includes multiple top winding mechanisms 131 and multiple bottom winding mechanisms 132 , each arranged along a first direction. Along a second direction, the top winding mechanisms 131 are located at the top of the drying section 1221 , while the bottom winding mechanisms 132 are located at the bottom of the drying section 1221 . The web 20 alternately winds around the top winding mechanisms 131 and the bottom winding mechanisms 132 .

[0081] The top winding mechanism 131 is disposed at the top of the drying section 1221 along the second direction and is used to wind the feed tape 20. It should be noted that the top winding mechanism 131 can be located above the drying section 1221 along the second direction or on either side of the upper end of the drying section 1221. In short, the top winding mechanism 131 is disposed at the top region of the drying section 1221 along the second direction.

[0082] The bottom winding mechanism 132 is disposed at the bottom of the drying section 1221 along the second direction and is used to wind the feed tape 20. It should be noted that the bottom winding mechanism 132 can be located below the drying section 1221 along the second direction or on either side of the bottom end of the drying section 1221. In short, the bottom winding mechanism 132 is disposed at the bottom end of the drying section 1221 along the second direction.

[0083] The multiple top winding mechanisms 131 and the multiple bottom winding mechanisms 132 are arranged along a first direction. Along the first direction, a bottom winding mechanism 132 may be disposed between two adjacent top winding mechanisms 131, and a top winding mechanism 131 may also be disposed between two adjacent bottom winding mechanisms 132. In other words, the top winding mechanisms 131 and the bottom winding mechanisms 132 are alternately disposed along the first direction. The material strip 20 alternately passes around the top winding mechanisms 131 and the bottom winding mechanisms 132, thereby forming a curved extension path within the drying chamber 111.

[0084] By setting up multiple top winding mechanisms 131 and multiple bottom winding mechanisms 132, and making the material belt 20 alternately wind around the top winding mechanism 131 and the bottom winding mechanism 132, the material belt 20 forms a curved extension path in the drying chamber 111, extending the extension length of the material belt 20 in the drying chamber 111, making it easier for multiple drying sections 1221 to jointly dry the material belt 20, thereby improving the drying effect.

[0085] Referring to FIG. 2 , in some embodiments, at least one top winding mechanism 131 includes a plurality of first rollers 1311 spaced apart along an arc-shaped trajectory, and the first rollers 1311 are used for winding the feed tape 20 .

[0086] The at least one top winding mechanism 131 includes a plurality of first rollers 1311, which are arranged at intervals along an arc-shaped trajectory. In some embodiments, the plurality of first rollers 1311 are arranged at intervals along a circular arc trajectory. In other embodiments, the plurality of first rollers 1311 are arranged at intervals along a parabolic trajectory (with the open end of the parabola facing the bottom of the drying section 1221).

[0087] By providing multiple first rollers 1311, each of which is in contact with the web 20, the total contact area between the multiple first rollers 1311 and the web 20 is increased, making the web 20 less susceptible to wrinkling and deviation. Furthermore, by spacing the multiple first rollers 1311 along an arcuate trajectory, the weight of the web 20 is not entirely concentrated on a single first roller 1311. Instead, the weight of the web 20 is distributed among the multiple first rollers 1311. The tension of the web 20 between two adjacent first rollers 1311 is reduced, making the web 20 less susceptible to wrinkling and breakage.

[0088] 3 , in some further embodiments, at least one top winding mechanism 131 includes a first roller 1311 for winding the supply tape 20. The supply tape 20 alternately winds around the first roller 1311 and the bottom winding mechanism 132.

[0089] In some embodiments, at least one bottom winding mechanism 132 includes a heating roller 1321 around which the supply tape 20 is wound, and the heating roller 1321 is used to heat and dry the supply tape 20 .

[0090] The heating roller 1321 is a roller structure that can generate heat by itself. The heating roller 1321 can heat and dry the material belt 20 wound thereon.

[0091] By providing the heating roller 1321 , the heating roller 1321 can not only convey the material belt 20 , but also heat and dry the material belt 20 , which is beneficial to improving the drying efficiency.

[0092] Please refer to Figure 4, which illustrates the internal structure of a drying device 10 according to yet other embodiments of the present application. In yet other embodiments, the conveying mechanism 13 further includes a side winding mechanism 133. Along the first direction, the side winding mechanism 133 is disposed on at least one side of the drying section 1221. The material strip 20 sequentially winds around the top winding mechanism 131, the side winding mechanism 133, and the bottom winding mechanism 132.

[0093] Along the first direction, the side winding mechanism 133 may be provided only on one side of the drying section 1221 , or may be provided on both sides of the drying section 1221 .

[0094] Optionally, along the first direction, the side winding mechanism 133 is located between the top winding mechanism 131 and the bottom winding mechanism 132 , so that the material strip 20 sequentially winds around the top winding mechanism 131 , the side winding mechanism 133 and the bottom winding mechanism 132 .

[0095] By providing the side winding mechanism 133, the weight of the strip 20 is distributed to the side winding mechanism 133, reducing the risk of excessive tension on the strip 20 due to its own weight, making the strip 20 less likely to wrinkle or break. In addition, by providing the side winding mechanism 133 and allowing the strip 20 to sequentially pass through the top winding mechanism 131, the side winding mechanism 133, and the bottom winding mechanism 132, the strip 20 receives greater support, reducing the risk of the strip 20 vibrating under external forces.

[0096] 4 , in some embodiments, the side winding mechanism 133 includes at least one second roller 1331 around which the supply belt 20 is wound.

[0097] The side winding mechanism 133 may include only one second roller 1331 , or may include multiple second rollers 1331 . For example, the side winding mechanism 133 may include two second rollers 1331 , three second rollers 1331 , or more than three second rollers 1331 .

[0098] The second roller 1331 is provided to wind the feeding belt 20 , which is simple, convenient and low-cost.

[0099] In some embodiments, the conveying mechanism 13 includes a heating roller 1321 around which the supply belt 20 is wound, and the heating roller 1321 is used to heat and dry the supply belt 20 .

[0100] By providing the heating roller 1321 , the heating roller 1321 can not only convey the material belt 20 , but also heat and dry the material belt 20 , which is beneficial to improving the drying efficiency.

[0101] 4 , in some embodiments, the first drying module 121 is an infrared drying module, and the second drying module 122 is a hot air drying module.

[0102] The infrared drying module may include an infrared lamp tube, which can emit infrared light to dry the material strip 20 .

[0103] The hot air drying module can blow out hot air to dry the material strip 20 .

[0104] When the strip 20 first enters the drying chamber 111, the active material layer contains a high amount of moisture, and the strip 20's own gravity is high, making it more susceptible to vibration when subjected to external forces. Therefore, the strip 20 is dried using an infrared drying module, which does not exert any force on the strip 20, thereby reducing the risk of vibration. The hot air drying module generates hot air to dry the strip 20, providing more uniform drying and improving drying quality.

[0105] 4 , in some embodiments, the drying device 10 further includes a third drying module 14 located downstream of the second drying module 122 along the conveying direction of the conveying mechanism 13 . The drying temperature of the third drying module 14 is lower than that of the second drying module 122 .

[0106] The third drying module 14 is used to dry the material strip 20. The third drying module 14 is closer to the material strip outlet 113 than the second drying module 122. Under the action of the conveying mechanism 13, the material strip 20 enters the drying chamber 111 from the material strip inlet 112 and passes through the first drying module 121, the second drying module 122, the third drying module 14, and the material strip outlet 113 in sequence. The structure of the third drying module 14 can be the same as or different from that of the first drying module 121 and / or the second drying module 122. The third drying module 14 can be an electric heating module, an infrared drying module, a hot air drying module, or the like. The drying temperature of the first drying module 121 is higher than that of the second drying module 122, and the drying temperature of the second drying module 122 is higher than that of the third drying module 14.

[0107] By providing the third drying module 14, whose drying temperature is lower than that of the second drying module 122, the material strip 20 is dried sequentially through the first drying module 121, the second drying module 122, and the third drying module 14, achieving a better drying effect. Furthermore, the third drying module 14 is closer to the material strip exit 113 than the second drying module 122. The third drying module 14 dries the material strip 20 at a low temperature, causing the temperature of the material strip 20 to drop, approaching the ambient temperature outside the drying apparatus 10. This minimizes the temperature difference between the material strip 20 before and after it leaves the drying apparatus 10, reducing the risk of the material strip 20 buckling due to a sudden drop in temperature.

[0108] In some embodiments, the third drying module 14 is an infrared drying module.

[0109] The infrared drying module is used for low-temperature drying. The drying temperature is easy to control, the drying cost is low, and the drying is not easily disturbed by external airflow, which has a better drying effect.

[0110] Referring to FIG. 5 , in some embodiments, the housing 11 has two independent drying chambers 111 . The two drying chambers 111 are arranged along the direction of gravity, and a drying device 12 is disposed in each drying chamber 111 .

[0111] The housing 11 has two drying chambers 111 that are not connected to each other. The two drying chambers 111 are arranged along the direction of gravity. Each drying chamber 111 is equipped with a drying device 12. One drying chamber 111 can be used to dry one side of the material strip 20 in the thickness direction, and the other drying chamber 111 can be used to dry the other side of the material strip 20 in the thickness direction.

[0112] By providing two drying chambers 111, one drying chamber 111 can be used to dry one side of the material strip 20, and the other drying chamber 111 can be used to dry the other side of the material strip 20, thereby improving the drying effect of the material strip 20. By arranging the two drying chambers 111 along the direction of gravity, the space in the direction of gravity is effectively utilized, and the floor space of the drying equipment 10 is reduced.

[0113] Referring to Figure 5 , in some embodiments, the housing 11 has a first side and a second side opposite each other along a first direction. The first direction intersects the direction of gravity. The material inlet 112 of one drying chamber 111 and the material outlet 113 of the other drying chamber 111 are located on the first side, while the material outlet 113 of one drying chamber 111 and the material inlet 112 of the other drying chamber 111 are located on the second side.

[0114] The housing 11 has a first side and a second side along a first direction, the first side and the second side being arranged opposite each other. The first side has a material strip inlet 112 for one drying chamber 111 and a material strip outlet 113 for the other drying chamber 111, while the second side has the material strip outlet 113 for the one drying chamber 111 and the material strip inlet 112 for the other drying chamber 111.

[0115] By locating the material strip inlet 112 of one drying chamber 111 and the material strip outlet 113 of another drying chamber 111 on the first side, and the material strip outlet 113 of one drying chamber 111 and the material strip inlet 112 of another drying chamber 111 on the second side, the material strip 20 can be output from the material strip outlet 113 of one drying chamber 111 and then enter the other drying chamber 111 from the material strip inlet 112 of another drying chamber 111, which is simple and quick, and reduces the transportation of the material strip 20.

[0116] An embodiment of the present application also provides a pole piece manufacturing system, which includes pole piece manufacturing equipment and the above-mentioned drying equipment 10. The pole piece manufacturing equipment is used to manufacture pole pieces, and the drying equipment 10 is arranged downstream of the pole piece manufacturing equipment. The drying equipment 10 is used to dry the pole pieces.

[0117] According to some embodiments of the present application, please refer to Figures 1 to 5.

[0118] An embodiment of the present application provides a drying device 10, comprising a housing 11 and a drying device 12. The housing 11 has a drying chamber 111, which has a material strip inlet 112 and a material strip outlet 113. The drying device 12 is disposed within the drying chamber 111. The drying device 12 includes a first drying module 121, a second drying module 122, and a conveying mechanism 13. The first drying module 121 and the second drying module 122 are used to dry a material strip 20. The conveying mechanism 13 is used to convey the material strip 20 so that the material strip 20 passes through the first drying module 121, the second drying module 122, and the material strip outlet 113 in sequence from the material strip inlet 112. The drying temperature of the first drying module 121 is higher than that of the second drying module 122. The drying equipment 10 is provided with a first drying module 121 and a second drying module 122, wherein the drying temperature of the first drying module 121 is greater than the drying temperature of the second drying module 122. After the material strip 20 enters the drying chamber 111 from the material strip inlet 112, it is first dried quickly and at high temperature by the first drying module 121, and then continuously dried by the second drying module 122. In this way, not only can the drying efficiency be improved, but also the drying quality is better.

[0119] The first drying module 121 extends along a first direction. The second drying module 122 includes multiple drying sections 1221 arranged along the first direction, with the material strip 20 passing through each of the drying sections 1221 in sequence. The drying sections 1221 are used to dry the material strip 20. The conveying mechanism 13 includes multiple top winding mechanisms 131 and multiple bottom winding mechanisms 132, both arranged along the first direction. In the second direction, the top winding mechanisms 131 are located at the top of the drying sections 1221, and the bottom winding mechanisms 132 are located at the bottom of the drying sections 1221. The material strip 20 alternates between the top winding mechanisms 131 and the bottom winding mechanisms 132. By setting up multiple top winding mechanisms 131 and multiple bottom winding mechanisms 132, and making the material belt 20 alternately wind around the top winding mechanism 131 and the bottom winding mechanism 132, the material belt 20 forms a curved extension path in the drying chamber 111, extending the extension length of the material belt 20 in the drying chamber 111, making it easier for multiple drying sections 1221 to jointly dry the material belt 20, thereby improving the drying effect.

[0120] At least one top winding mechanism 131 includes a plurality of first rollers 1311 arranged at intervals along an arcuate trajectory. The first rollers 1311 are used to wind the material strip 20. By providing multiple first rollers 1311, each first roller 1311 is in contact with the material strip 20 during winding, thereby increasing the total contact area between the multiple first rollers 1311 and the material strip 20, making the material strip 20 less susceptible to wrinkling and deviation. Furthermore, by arranging the multiple first rollers 1311 at intervals along the arcuate trajectory, the weight of the material strip 20 is not entirely concentrated on a single first roller 1311. Instead, the weight of the material strip 20 can be distributed among the multiple first rollers 1311. The tension of the material strip 20 between two adjacent first rollers 1311 is reduced, making the material strip 20 less susceptible to wrinkling or breaking.

[0121] At least one bottom winding mechanism 132 includes a heating roller 1321 around which the feed belt 20 is wound. The heating roller 1321 is used to heat and dry the feed belt 20. By providing the heating roller 1321, the heating roller 1321 can not only convey the feed belt 20 but also heat and dry the feed belt 20, thereby improving drying efficiency.

[0122] The drying device 10 also includes a third drying module 14, which is located downstream of the second drying module 122 along the conveying direction of the conveying mechanism 13. The drying temperature of the third drying module 14 is lower than that of the second drying module 122. By providing the third drying module 14, the drying temperature of the third drying module 14 is lower than that of the second drying module 122. The material strip 20 is dried sequentially through the first drying module 121, the second drying module 122, and the third drying module 14, achieving a good drying effect. Furthermore, the third drying module 14 is closer to the material strip outlet 113 than the second drying module 122. The third drying module 14 performs low-temperature drying on the material strip 20, which reduces the temperature of the material strip 20 and brings it closer to the ambient temperature outside the drying device 10. This minimizes the temperature difference between the material strip 20 before and after it leaves the drying device 10, reducing the risk of the material strip 20 buckling due to a sudden drop in temperature.

[0123] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A drying device, wherein: The drying equipment comprises: The housing has a drying chamber, wherein the drying chamber has a material strip inlet and a material strip outlet; A drying device is arranged in the drying chamber, and the drying device includes a first drying module, a second drying module and a conveying mechanism. The first drying module and the second drying module are used to dry the material belt. The conveying mechanism is used to convey the material belt so that the material belt passes through the first drying module, the second drying module and the material belt outlet in sequence from the material belt entrance. The drying temperature of the first drying module is greater than the drying temperature of the second drying module.

2. The drying device according to claim 1, wherein: The first drying module extends along a first direction, the second drying module includes a plurality of drying parts, the plurality of drying parts are arranged along the first direction, the material belt passes around the plurality of drying parts in sequence, and the drying parts are used to dry the material belt.

3. The drying device according to claim 2, wherein: The drying part is located at the bottom of the first drying module along a second direction, and the second direction intersects with the first direction.

4. The drying device according to claim 3, wherein: The drying equipment also includes a third drying module. Along the conveying direction of the conveying mechanism, the third drying module is located downstream of the second drying module. The drying temperature of the third drying module is lower than the drying temperature of the second drying module. Along the second direction, the third drying module is located at the bottom of the drying section.

5. The drying device according to claim 3 or 4, wherein: The conveying mechanism comprises a plurality of top winding mechanisms and a plurality of bottom winding mechanisms, wherein the plurality of top winding mechanisms and the plurality of bottom winding mechanisms are arranged along the first direction, and along the second direction, the top winding mechanisms are located at the top of the drying section, and the bottom winding mechanisms are located at the bottom of the drying section; The material strip is alternately wound around the top winding mechanism and the bottom winding mechanism.

6. The drying device according to claim 5, wherein: At least one of the top winding mechanisms includes a plurality of first rollers arranged at intervals along an arc track, and the first rollers are used for winding the material strip.

7. The drying device according to claim 5 or 6, wherein: At least one of the bottom winding mechanisms includes a heating roller for winding the material strip, and the heating roller is used to heat and dry the material strip.

8. The drying device according to any one of claims 5 to 7, wherein: The conveying mechanism also includes a side winding mechanism. Along the first direction, at least one side of the drying section is provided with the side winding mechanism, and the material belt sequentially winds around the top winding mechanism, the side winding mechanism and the bottom winding mechanism.

9. The drying device according to claim 8, wherein: The side winding mechanism includes at least one second roller for winding the material strip.

10. The drying device according to any one of claims 1 to 9, wherein: The conveying mechanism comprises a heating roller around which the material belt is wound, and the heating roller is used to heat and dry the material belt.

11. The drying device according to any one of claims 1 to 10, wherein: The first drying module is an infrared drying module, and the second drying module is a hot air drying module.

12. The drying device according to any one of claims 1 to 11, wherein: The drying device further includes a third drying module, which is located downstream of the second drying module along the conveying direction of the conveying mechanism, and a drying temperature of the third drying module is lower than a drying temperature of the second drying module.

13. The drying device according to claim 12, wherein: The third drying module is an infrared drying module.

14. The drying device according to any one of claims 1 to 12, wherein: The shell has two drying chambers that are independent of each other. The two drying chambers are arranged along the direction of gravity, and the drying device is arranged in each drying chamber.

15. The drying device according to claim 14, wherein: Along a first direction, the shell has a first side and a second side opposite to each other, the first direction intersects with the gravity direction, the material belt inlet of one drying chamber and the material belt outlet of another drying chamber are located on the first side, and the material belt outlet of one drying chamber and the material belt inlet of another drying chamber are located on the second side.

16. A pole piece manufacturing system, wherein: include: Pole piece manufacturing equipment, used for manufacturing pole pieces; The drying equipment according to any one of claims 1 to 15 is arranged downstream of the electrode manufacturing equipment, and the drying equipment is used to dry the electrode.

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