Pole piece drying equipment

Abstract

The invention relates to pole piece drying equipment. The pole piece drying equipment comprises a drying oven unit and an infrared heating assembly. A drying channel for conveying the pole piece is formed in a spacing area between the drying oven unit and the infrared heating assembly; a plurality of airflow heating pieces are arranged on the side portion of the drying oven unit in the transmission direction of the pole pieces, the airflow heating pieces are used for generating circulating hot air in the drying channel, and the infrared heating assembly is used for enabling infrared radiation to act on the pole pieces so as to achieve internal heating type heating. According to the scheme provided by the invention, infrared heating and hot air convection are combined, so that different parts of the pole piece can be heated more uniformly, volatilization of a solvent on the surface of the pole piece is accelerated, and the drying and curing efficiency of the pole piece can be improved.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to an electrode drying device. Background Art

[0002] The coating machine oven is a key equipment for drying the pole pieces after coating in the production of lithium batteries. In the manufacture of lithium batteries, the pole pieces are coated with slurry containing active substances and other ingredients after the coating process. The pole piece coating machine oven is used to quickly dry and solidify these slurries. It generally uses a hot air circulation system and the principles of convection and conduction to quickly evaporate the solvent on the pole piece, so that the slurry forms a uniform, dense and well-adhesive coating, which is crucial to improving the overall performance and production yield of lithium batteries.

[0003] In the related art, the coating machine oven is mostly heated by hot air drying. When the hot air circulates in the oven, there is an uneven airflow distribution, which causes uneven heating of different parts of the electrode and inconsistent drying degree, which in turn leads to low drying and curing efficiency of the electrode. Summary of the invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a pole piece drying device, which combines infrared heating with hot air convection, can make different parts of the pole piece heated more evenly, accelerate the volatilization of the solvent on the surface of the pole piece, and thus improve the drying and curing efficiency of the pole piece.

[0005] The present application provides a pole piece drying device, comprising: Oven unit and infrared heating components; Among them, a drying channel for transmitting the electrode is formed in the spacing area between the oven unit and the infrared heating component; a plurality of airflow heating elements are arranged on the side of the oven unit along the transmission direction of the electrode, and the airflow heating elements are used to generate circulating hot air in the drying channel, and the infrared heating component is used to apply infrared radiation to the electrode to realize internal heating.

[0006] In one embodiment, the base of the airflow heating element is connected to the oven unit, and the base is provided with an air inlet; The end of the air flow heating element is arranged away from the base, and a pressure relief chamber and an air outlet are provided at the end. At least two layers of air uniformity plates are provided between the air inlet and the air outlet, and air uniformity holes are opened on the air uniformity plate. The air uniformity holes of the air uniformity plate close to the pressure relief chamber are opposite to the air outlet, and the pressure relief chamber is adjacent to the air outlet.

[0007] In one embodiment, a first air uniformity plate and a second air uniformity plate spaced apart from each other are provided between the air inlet and the air outlet, the first air uniformity plate is provided close to the air duct of the oven unit, and the second air uniformity plate is located between the first air uniformity plate and the pressure relief chamber; The first wind uniforming plate is provided with a first wind uniforming hole, the second wind uniforming plate is provided with a second wind uniforming hole, and the second wind uniforming hole is opposite to the air outlet.

[0008] In one embodiment, at least two air outlets are provided and distributed on the side of the pressure relief chamber, and at least two rows of the second uniform air holes are provided along the width direction of the airflow heating element, and the interval between the second uniform air holes in adjacent rows is 5-10 mm; and / or, The distance between the first air uniformity plate and the second air uniformity plate is 10-20 mm; and / or, The aperture of the first air uniforming hole and / or the second air uniforming hole is 2-5 mm.

[0009] In one embodiment, the infrared heating component includes a substrate and an infrared heating portion disposed on a side of the substrate. The infrared heating part includes a base layer, a protective layer and an infrared heating layer arranged between the base layer and the protective layer; the base layer is arranged on the surface of the substrate, and the protective layer is arranged on the surface of the infrared heating layer away from the base layer.

[0010] In one embodiment, the substrate is a hollow structure, and the interior of the substrate is filled with heat insulating material.

[0011] In one embodiment, the infrared heating portion includes at least three columns of sub-infrared heating portions arranged along the width direction of the substrate, each column of the sub-infrared heating portions includes a plurality of infrared heating plates spliced ​​along the length direction of the substrate, and the infrared heating plates in adjacent columns are staggered at the connection points.

[0012] In one embodiment, the oven unit comprises a first oven and a second oven arranged opposite to each other, a plurality of airflow heating elements are arranged on opposite sides of the first oven and the second oven, and the infrared heating component is arranged between the first oven and the second oven; Infrared heating parts are provided on both sides of the infrared heating component, wherein a first drying channel is formed between the infrared heating part on one side and the first oven, and a second drying channel is formed between the infrared heating part on the other side and the second oven; It also includes a rotating mechanism, which is arranged between the output end of the first drying channel and the input end of the second drying channel, and is used to transport the electrode sheets dried in the first drying channel to the second drying channel.

[0013] In one embodiment, it further includes a rotation correction unit, which is arranged between the outlet end of the first drying channel and the inlet end of the second drying channel; The rotary deviation correction unit includes a deviation correction device, a first roller, a second roller and a deviation correction detection device. The rotary mechanism is arranged between the first roller and the second roller; the first roller is arranged at the outlet end of the first drying channel, and the second roller is arranged at the inlet end of the second drying channel; the deviation correction device is transmission-connected to the first roller, and the deviation correction detection device is arranged between the rotary mechanism and the second roller. The deviation correction detection device is used to detect the lateral position offset of the pole piece during the transmission process, and feed the offset back to the deviation correction device. The deviation correction device adjusts the lateral displacement of the first roller according to the offset information to realize the rotary deviation correction of the pole piece.

[0014] In one embodiment, the rotary mechanism includes a driving roller, a first driven roller and a second driven roller; The first driven roller and the second driven roller are respectively arranged on both sides of the active roller, and correspond to the first drying channel and the second drying channel respectively. The first passing roller, the first driven roller, the active roller, the second driven roller, the deviation correction detection device and the second passing roller are arranged in sequence along the tape running direction of the pole piece.

[0015] The technical solution provided by this application may have the following beneficial effects: The electrode drying equipment provided by the present application includes an oven unit and an infrared heating component, wherein the interval area between the oven unit and the infrared heating component forms a drying channel for transmitting the electrode; the side of the oven unit is provided with a plurality of airflow heating elements along the transmission direction of the electrode, and the airflow heating elements are used to generate circulating hot air in the drying channel, and the infrared heating component is used to apply infrared radiation to the electrode to achieve internal heating. The present application adopts two heating and drying methods, namely infrared heating and airflow heating, to combine infrared heating with hot air convection, so that the temperature of the electrode slurry coating and the internal temperature of the substrate are uniformly increased, and the solvent volatilization of the slurry coating on the surface of the electrode is accelerated, so that different parts of the electrode can be heated more evenly, thereby improving the drying and curing efficiency of the electrode.

[0016] Further, the oven unit comprises a first oven, a second oven and a rotary mechanism arranged opposite to each other, a plurality of airflow heating elements are arranged on opposite sides of the first oven and the second oven, and the infrared heating component is arranged between the first oven and the second oven; infrared heating parts are arranged on both sides of the infrared heating component, wherein a first drying channel is formed between the infrared heating part on one side and the first oven, and a second drying channel is formed between the infrared heating part on the other side and the second oven; the rotary mechanism is arranged between the output end of the first drying channel and the input end of the second drying channel, and is used to transport the electrode dried in the first drying channel to the second drying channel. The first drying channel and the second drying channel are separated by the infrared heating component to form two independent drying channels, so as to avoid interference of the airflow interference generated by the airflow heating parts of the first oven and the second oven on the electrode, and ensure the stable operation of the electrode tape. The electrode is dried for the first time in the first drying channel, and then input into the second drying channel for secondary drying through the rotary mechanism, so as to realize baking twice in the same device, which can further improve the drying speed of the electrode and improve the drying efficiency.

[0017] Furthermore, the airflow heating element provided by the present application is evenly adjusted by multiple air-distributing plates, and the airflow throttling effect is formed by the arc-shaped slit-shaped air outlet, which can balance the pressure fluctuation in the airflow heating element cavity, and at the same time use the arc surface of the inner wall of the air outlet to guide the airflow to transition smoothly, reduce turbulence and noise, and ensure the stability of the air outlet pressure. At the same time, the wind guided out of the air outlet at least partially diffuses to the pressure relief chamber, forming a vortex accumulation inside the pressure relief chamber, avoiding direct contact between the vortex and the pole piece, thereby reducing the influence of the vortex on the wind speed and temperature on the surface of the pole piece, and improving the consistency of airflow drying.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0020] Figure 1 It is a structural schematic diagram of an electrode drying device shown in an embodiment of the present application; Figure 2 is a cross-sectional view of an infrared heating component shown in an embodiment of the present application; Figure 3 is a cross-sectional view of an infrared heating unit shown in an embodiment of the present application; Figure 4 is a plan view of an infrared heating component shown in an embodiment of the present application; Figure 5 is a schematic structural diagram of an airflow heating element shown in an embodiment of the present application; Figure 6 It is a schematic diagram of the structure of the rotary deviation correction unit of the electrode drying equipment shown in the embodiment of the present application.

[0021] Reference numerals: 100, first oven; 110, first drying channel; 200, second oven; 210, second drying channel; 300, air flow heating element; 310, first air uniform plate; 311, first air uniform hole; 320, second air uniform plate; 321, second air uniform hole; 330, pressure relief chamber; 340, air outlet; 400, infrared heating component; 410, substrate; 420, infrared heating part; 421, base layer; 422, infrared heating layer; 423, protective layer; 424, electrode; 425, infrared heating plate; 500, rotating mechanism; 510, active roller; 511, first driven roller; 512, second driven roller; 600, rotating deviation correction unit; 610, deviation correction device; 611, first over roller; 612, actuator; 620, second over roller; 630, deviation correction detection device. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the related art, the coating machine oven is mostly heated by hot air drying, which has a single drying method and low efficiency. Moreover, when the hot air circulates in the oven, there is an uneven distribution of airflow, which causes uneven heating of different parts of the electrode and inconsistent drying degree, affecting the consistency of the electrode performance. In view of the above problems, the embodiment of the present application provides an electrode drying device. The solution provided by the present application can make different parts of the electrode more evenly heated, thereby improving the drying and curing efficiency of the electrode.

[0026] In some embodiments, the electrode drying equipment provided in the present application includes an oven unit and an infrared heating component, and the spacing area between the oven unit and the infrared heating component forms a drying channel for transmitting the electrode; a plurality of airflow heating elements are arranged on the side of the oven unit along the transmission direction of the electrode, and the airflow heating elements are used to generate circulating hot air in the drying channel, and the infrared heating component is used to apply infrared radiation to the electrode to achieve internal heating.

[0027] The present application adopts two heating and drying methods, infrared heating and airflow heating, which work together on both sides of the electrode, combining infrared heating with hot air convection to increase the temperature of the electrode slurry coating and the internal temperature of the substrate, and achieves drying through heat conduction. The volatile solvent and moisture in the electrode are brought out by circulating airflow, which can not only achieve rapid drying of the electrode and improve drying efficiency, but also make different parts of the electrode evenly heated, thereby improving the drying consistency of the electrode.

[0028] In the related art, only hot air drying may have the problem of uneven drying caused by uneven airflow distribution. The infrared heating component of the present application uses infrared radiation to directly act on the inside of the pole piece, and performs relatively uniform internal heating on different parts of the pole piece. By combining hot air drying and infrared drying, such a fast and uniform drying method can effectively avoid cracking, bubbles, wrinkles and other defects of the pole piece during the drying process, making the pole piece surface smoother and the internal structure more stable, thereby improving the quality and performance of the pole piece, which is beneficial to improving the key indicators such as the charging and discharging performance and cycle life of lithium batteries.

[0029] Hot air drying in related technologies consumes a certain amount of energy in the process of heating air and maintaining hot air circulation. The application uses infrared heating components to heat with concentrated energy and strong targeting. When infrared heating and hot air drying are combined, the energy output of hot air and infrared can be flexibly adjusted according to the drying needs of the electrode, so that energy can be used more reasonably in different drying stages and the overall energy consumption can be reduced.

[0030] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0031] Figure 1 It is a schematic diagram of the structure of the electrode drying equipment shown in the embodiment of the present application.

[0032] See also Figure 1 In some embodiments, the electrode sheet drying equipment provided by the present application comprises an oven unit including a first oven 100, a second oven 200 and a rotating mechanism 500 arranged opposite to each other, and a plurality of airflow heating elements 300 are arranged on opposite sides of the first oven 100 and the second oven 200; an infrared heating component 400 is arranged between the first oven 100 and the second oven 200, and a first drying channel 110 for the first transmission of the electrode sheet is formed between one side of the infrared heating component 400 and the first oven 100, and a second drying channel 210 for the second transmission of the electrode sheet 700 is formed between the other side of the infrared heating component 400 and the second oven 200; the rotating mechanism 500 is arranged between the output end of the first drying channel 110 and the input end of the second drying channel 210, and is used to transport the electrode sheet 700 dried in the first drying channel 110 to the second drying channel 210, so as to perform secondary drying of the electrode sheet in the second drying channel 210.

[0033] After such arrangement, the first drying channel 110 and the second drying channel 210 are separated by the infrared heating component 400 to form two independent drying channels, so as to avoid the interference of the airflow interference generated by the airflow heating element 300 of the first oven 100 and the second oven 200 on the electrode, and ensure the stable operation of the electrode belt. The electrode is dried for the first time in the first drying channel 110, and then input into the second drying channel 210 for secondary drying through the rotary mechanism 500, so as to realize the baking twice in the same device, which can further improve the drying speed of the electrode and improve the drying efficiency.

[0034] The first drying channel 110 and the second drying channel 210 are separated by a heating component, and two independent drying channels are formed between the first oven 100 and the second oven 200, so as to avoid interference of the airflow interference generated by the airflow heating element 300 of the first oven 100 and the second oven 200 on the electrode, and ensure the stable operation of the electrode belt. The electrode is dried for the first time in the first drying channel 110, and then input into the second drying channel 210 through the rotary mechanism 500 for secondary drying, so as to realize baking twice in the same equipment and realize rapid drying of the electrode.

[0035] A group of airflow heating elements 300 are arranged on the top / bottom sides of the first drying channel 110 and the second drying channel 210. Each airflow heating element 300 realizes bidirectional penetrating heating through the flow equalizing plate and the guide hole to avoid warping and deformation caused by unilateral heating. The airflow heating element 300 is combined with graphene infrared heating, and heat does not need to be transferred by a medium. The electrode can reach the target temperature in a short time, which can accelerate the volatilization of the electrode solvent and the diffusion of heat, improve the drying efficiency, and thus ensure the drying quality and production efficiency of the electrode.

[0036] In the solution of the present application, the first oven 100 and the second oven 200 can be arranged up and down, and the first drying channel 110 and the second drying channel 210 adopt a horizontal U-shaped layout, combined with the high-pressure air supply of the airflow heating elements 300 of the first oven 100 and the second oven 200, to ensure that the hot air circulates quickly in the first drying channel 110 and the second drying channel 210 to avoid local overheating of the electrode or the occurrence of airflow dead corners.

[0037] Figure 2 is a cross-sectional view of an infrared heating component 400 shown in an embodiment of the present application; Figure 3 It is a cross-sectional view of the infrared heating unit shown in the embodiment of the present application. See also Figure 1-Figure 3 In some embodiments, the infrared heating component 400 includes a substrate 410 and infrared heating parts 420 fixed on both sides of the substrate 410. The infrared heating parts 420 on both sides of the substrate 410 are arranged in opposite directions in the thickness direction of the substrate 410. The infrared heating parts 420 on one side of the substrate 410 face the first drying channel 110, and the infrared heating parts on the other side of the substrate 410 face the second drying channel 210. The infrared heating parts 420 on each side include a base layer 421, a protective layer 423, and an infrared heating layer arranged between the base layer 421 and the protective layer 423.

[0038] The substrate 410 can be a plate-shaped component, with its length direction along the running direction of the pole piece 700. The base layer 421 is arranged on both side surfaces of the substrate 410, the infrared heating layer is arranged on the base layer 421, and the protective layer 423 is arranged on the outer surface of the infrared heating layer away from the base layer 421, for protecting the infrared heating layer.

[0039] In this embodiment, the infrared heating layer 422 is a graphene film, for example, a nano-scale graphene film material. The graphene film is connected to the electrode 424, and radiates heat to the outside in the form of far infrared after power is turned on. The high-energy infrared rays emitted pass through the protective layer 423 and act on the electrode piece, which can increase the temperature of the current collector and the slurry coating of the electrode piece, and achieve drying through heat conduction.

[0040] Because graphene has ultra-high thermal conductivity and can quickly convert electrical energy into thermal energy, the pole piece can reach the required drying temperature in a short time. Compared with traditional heating methods, it can effectively shorten the heating time and thus improve production efficiency. Its two-dimensional structure enables it to quickly transfer heat, and the heat can quickly diffuse on the pole piece, achieving rapid temperature rise, meeting the demand for rapid drying in pole piece production.

[0041] Moreover, because graphene has good chemical and physical stability, it is not prone to oxidation and aging during long-term heating. It can maintain stable heating performance and a long service life, which can reduce the maintenance and replacement costs of equipment.

[0042] The graphene heating layer of the present application can achieve uniform thickness and provide very uniform heat distribution when powered on to generate heat, thereby avoiding local overheating or overcooling of the electrode, helping to ensure the consistency and stability of the electrode drying, and forming a uniform thermal field on the entire surface of the electrode, so that the slurry on the electrode can be evenly solidified during the drying process, reducing coating defects caused by uneven drying, such as cracking and blistering.

[0043] The infrared heating layer 422 can be applied to the base layer 421 by coating, printing, chemical vapor deposition, hot pressing or lamination of graphene slurry. The base layer 421 is made of a material with good thermal conductivity, insulation and mechanical strength. On the one hand, the base layer 421 can quickly transfer the heat generated by the graphene to the surface of the infrared heating part to avoid local overheating; on the other hand, the base layer 421 is made of a material with good insulation, which can isolate the circuits of the graphene films on both sides of the substrate 410 to prevent electric shock or short circuit; moreover, the base layer 421 can provide physical support for the graphene film to ensure the overall stability and durability of the graphene film.

[0044] In some embodiments, the material of the base layer 421 includes microcrystalline glass or ceramic material, and the material of the protective layer 423 may include a coating of at least one of a polymer film, a ceramic coating, a glass coating or a metal oxide material. The protective layer 423 may be coated, hot pressed or laminated on the infrared heating layer 422, or the protective layer 423 may be adhered to the heating layer by coating an adhesive. The protective layer 423 can be moisture-proof, dust-proof, and corrosion-proof, extend the service life of the graphene film, prevent human body from contacting live parts, avoid the risk of electric shock, resist external scratches, bending or impact, assist in heat dissipation or heat preservation, and optimize thermal efficiency.

[0045] In some embodiments, the substrate 410 is a plate-shaped hollow structure, and the interior of the substrate 410 is filled with a heat-insulating material, so that the substrate 410 has a good heat-insulating effect to avoid heat transfer between the graphene films on both sides. Specifically, the heat-insulating material can be at least one of a nanoplate, aluminum silicate wool, and asbestos board, but is not limited thereto. Figure 4 It is a plan view of the infrared heating component shown in the embodiment of the present application.

[0046] See also Figure 3 and Figure 4In some embodiments, the infrared heating unit 420 includes at least three columns of sub-infrared heating units (420a, 420b, 420c) arranged along the width direction of the substrate 410, and each column of sub-infrared heating units includes a number of infrared heating plates 425 spliced ​​along the length direction of the substrate 410, and the infrared heating plates 425 of adjacent columns are staggered at the connection. Compared with the flush arrangement, the staggered arrangement can cover the radiation missing area of ​​the connecting part of the adjacent infrared heating plates 425, and realize the full range of radiation coverage in the direction of the pole piece. Since the connection between two adjacent sub-infrared heating plates 425 in each column does not have the infrared radiation function, the adjacent staggered parts are covered by the radiation area, which can avoid or reduce the part of the pole piece that cannot be heated or the heating dead corner, thereby improving the baking uniformity of the pole piece.

[0047] In addition, since the entire large-area graphene infrared heating plate 425 is prone to uneven coating of the graphene slurry and incomplete drying during the manufacturing process, the heating performance of the graphene film is affected. Moreover, the large-area graphene infrared heating plate 425 may produce stress due to local thermal expansion during the heating process, causing deformation or damage to the material. The present application achieves the following technical effects by arranging at least three rows of sub-infrared heating portions (420a, 420b, 420c) of the infrared heating portion along the width direction of the substrate 410, and staggering the connection points of adjacent rows of sub-infrared heating plates 425: 1. It can avoid the defects of poor heating performance of the graphene film caused by manufacturing process limitations such as uneven coating of the graphene slurry and incomplete drying; 2. The splicing layout can disperse thermal stress and improve the durability of the graphene heating plate; 3. Installation and maintenance are more convenient. The splicing design can flexibly adjust the size and shape of the red graphene heating plate, can adapt to the spatial layout of the oven, and can replace damaged sub-infrared heating portions separately to reduce maintenance costs; 4. It can achieve uniform heat transfer between the sub-infrared heating portions to avoid heating performance problems caused by uneven local heat distribution of a whole infrared heating portion; 5. The heating plates can be cut and spliced ​​according to actual needs to reduce material waste.

[0048] Figure 5 It is a schematic diagram of the structure of the airflow heating element shown in the embodiment of the present application.

[0049] See also Figure 1 and Figure 5In some embodiments, the first oven 100 and the second oven 200 are provided with air ducts, and the airflow heating unit includes a plurality of airflow heating elements 300 connected to the air ducts. The airflow heating element 300 is provided with an air inlet at its base, and a pressure relief chamber 330 and an air outlet 340 at its end. At least two layers of uniform air plates are provided between the air inlet and the air outlet 340, and uniform air holes are provided on the uniform air plates. The wind guided out of the air outlet 340 is at least partially diffused to the pressure relief chamber 330 to form a vortex accumulation inside the pressure relief chamber 330, so as to avoid direct contact between the vortex and the pole piece, thereby reducing the influence of the vortex on the wind speed and temperature on the surface of the pole piece, and improving the consistency of airflow drying. The air outlet 340 is in the shape of an arc slit, so as to reduce the rapid change of the direction of the airflow and make the transition of the hot air at the air outlet 340 smoother. The airflow in the airflow heating element 300 is evenly adjusted in multiple layers, and cooperates with the arc-shaped slit-shaped air outlet 340 to form an airflow throttling effect, which can balance the pressure fluctuations in the cavity of the airflow heating element 300. At the same time, the arc surface of the inner wall of the air outlet 340 is used to guide the airflow to transition smoothly, reduce turbulence and noise, and ensure stable air outlet pressure.

[0050] In some embodiments, a first air uniformity plate 310 and a second air uniformity plate 320 are provided between the air inlet and the air outlet 340 of the air flow heating element 300, the first air uniformity plate 310 is provided close to the air duct, the air inlet of the air flow heating element 300 is located above the first air uniformity plate 310, the air inlet cross section may be rectangular, and the rectangular cross section of the air inlet is designed to match the layout of the oven air duct to ensure a large flow of air supply. The second air uniformity plate 320 is located between the first air uniformity plate 310 and the pressure relief chamber 330; the first air uniformity plate 310 is provided with a first air uniformity hole 311, the second air uniformity plate 320 is provided with a second air uniformity hole 321, and the second air uniformity hole 321 is opposite to the air outlet 340.

[0051] Hot air enters the corresponding airflow heating elements 300 from the air ducts of the first oven 100 and the second oven 200. The airflow first passes through the first air uniformity holes 311 on the first air uniformity plate 310, and the airflow is adjusted for the first time. The airflow after the first uniformity passes through the second air uniformity holes 321 of the second air uniformity plate 320, and is adjusted for the second time, thereby achieving multi-level and uniform diffusion of the airflow in the horizontal and vertical directions, avoiding the local eddy current or uneven pressure problems caused by the concentrated airflow in the traditional airflow heating element 300, and can significantly improve the drying uniformity.

[0052] In some embodiments, the air flow heating element 300 is provided with at least two air outlets 340, and they are distributed on the side of the pressure relief chamber 330. For example, when two air outlets 340 are provided, they are respectively located on both sides of the pressure relief chamber 330, and the second air uniforming plate 320 is provided with a second air uniforming hole 321 in the area opposite to the two air outlets 340.

[0053] In some embodiments, the second air uniformity holes 321 are arranged in at least two rows along the width direction of the air flow heating element 300, and the interval between the second air uniformity holes 321 in adjacent rows is 5-10 mm. The interval between the first air uniformity plate 310 and the second air uniformity plate 320 is 10-20 mm; the apertures of the first air uniformity holes 311 and the second air uniformity holes 321 are 2-5 mm.

[0054] Figure 6 It is a schematic diagram of the structure of the rotary deviation correction unit of the electrode drying equipment shown in the embodiment of the present application.

[0055] See also Figure 1 and Figure 6 In some embodiments, the electrode drying equipment of the present application also includes a rotation correction unit 600, which is arranged between the outlet end of the first drying channel 110 and the inlet end of the second drying channel 210; the rotation correction unit 600 is used to detect the position offset of the electrode during the transmission process, and perform rotation correction on the electrode entering the second drying channel 210 according to the offset information.

[0056] In some embodiments, the rotation and deflection correction unit 600 includes a deflection correction device 610, a first roller 611, a second roller 620, and a deflection correction detection device 630. The deflection correction detection device 630 may be a displacement sensor, which can sense the displacement information of the pole piece in the width direction. The rotation mechanism 500 is arranged between the first roller 611 and the second roller 620. The first roller 611 is arranged at the outlet end of the first drying channel 110, and the second roller 620 is arranged at the inlet end of the second drying channel 210. The deflection correction device 610 is connected to the first roller 611 by transmission, and the deflection correction detection device 630 is arranged between the rotation mechanism 500 and the second roller 620. The deflection correction detection device 630 is used to detect the lateral position offset of the pole piece during the transmission process, and feed the offset back to the deflection correction device 610. The deflection correction device 610 adjusts the lateral displacement of the first roller 611 according to the offset information to realize the rotation and deflection correction of the pole piece.

[0057] In some embodiments, the rotary mechanism 500 includes an active roller 510 and a plurality of driven rollers, and the pole piece is wound around the active roller 510 and the plurality of driven rollers, thereby enhancing the adaptability of the system to the pole piece tension. Specifically, the rotary mechanism 500 includes an active roller 510, a first driven roller 511, and a second driven roller 512, the first driven roller 511 and the second driven roller 512 are respectively arranged on both sides of the active roller 510, the first driven roller 511 is adjacent to the first over-roller 611, the second driven roller 512 is adjacent to the deviation correction detection device, the active roller 510, the first driven roller 511, and the second driven roller 512 are respectively located at the three vertices of the virtual triangle, and after the pole piece is output from the first drying channel 110, it passes through the first over-roller 611, the first driven roller 511, the active roller 510, the second driven roller 512, the deviation correction detection device, and the second over-roller 620 in sequence before entering the second drying channel 210.

[0058] After such arrangement, after the electrode is baked in the first drying channel 110, it passes through the first roller 611 and the rotating mechanism 500 for rotation, and then enters the second drying channel 210 for the second baking. Since the deviation correction detection device is arranged in front of the second roller 620, when the deviation correction detection device detects that the running direction and position information of the electrode material belt have changed, the signal is transmitted to the deviation correction device 610. The deviation correction device 610 controls the lateral position of the first roller 611 to correct the material belt and return it to the normal operating trajectory, thereby achieving uniformity and stability in the drying of the electrode.

[0059] In this embodiment, the correction device 610 includes a controller and an actuator 612. After receiving the detection signal from the displacement sensor, the controller processes the signal and issues a command. The actuator 612, such as a cylinder or a motor, can adjust the position or angle of the first roller 611 to return the pole piece to the correct position. The axial ends of the first roller 611 are mounted on a slider or a guide rail, and the first roller 611 can be driven by a servo motor or a cylinder to move laterally as a whole. In the solution of the present application, the correction device 610 detects the lateral offset of the pole piece in real time through a correction detection device, and quickly adjusts the position of the first roller 611 through feedback, thereby realizing dynamic correction. It can be accurately adjusted without manual intervention, thereby reducing the risk of edge wear or tear caused by pole piece deviation.

[0060] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A pole piece drying device, characterized in that: include: Oven unit and infrared heating components; Among them, a drying channel for transmitting the electrode is formed in the spacing area between the oven unit and the infrared heating component; a plurality of airflow heating elements are arranged on the side of the oven unit along the transmission direction of the electrode, and the airflow heating elements are used to generate circulating hot air in the drying channel, and the infrared heating component is used to apply infrared radiation to the electrode to realize internal heating.

2. The electrode drying device according to claim 1, characterized in that: The base of the airflow heating element is connected to the oven unit, and the base is provided with an air inlet; The end of the air flow heating element is arranged away from the base, and a pressure relief chamber and an air outlet are provided at the end. At least two layers of air uniformity plates are provided between the air inlet and the air outlet, and air uniformity holes are opened on the air uniformity plate. The air uniformity holes of the air uniformity plate close to the pressure relief chamber are opposite to the air outlet, and the pressure relief chamber is adjacent to the air outlet.

3. The electrode drying device according to claim 2, characterized in that: A first air uniformity plate and a second air uniformity plate spaced apart from each other are provided between the air inlet and the air outlet, the first air uniformity plate is provided close to the air duct of the oven unit, and the second air uniformity plate is located between the first air uniformity plate and the pressure relief chamber; The first wind uniforming plate is provided with a first wind uniforming hole, the second wind uniforming plate is provided with a second wind uniforming hole, and the second wind uniforming hole is opposite to the air outlet.

4. The electrode drying device according to claim 3, characterized in that: The air outlets are provided with at least two and are distributed on the side of the pressure relief chamber, the second air uniformity holes are provided in at least two rows along the width direction of the air flow heating element, and the interval between the second air uniformity holes in adjacent rows is 5-10 mm; and / or, The distance between the first air uniformity plate and the second air uniformity plate is 10-20 mm; and / or, The aperture of the first air uniforming hole and / or the second air uniforming hole is 2-5 mm.

5. The electrode drying device according to claim 1, characterized in that: The infrared heating component comprises a substrate and an infrared heating part arranged on the side of the substrate. The infrared heating part includes a base layer, a protective layer and an infrared heating layer arranged between the base layer and the protective layer; the base layer is arranged on the surface of the substrate, and the protective layer is arranged on the surface of the infrared heating layer away from the base layer.

6. The electrode drying device according to claim 5, characterized in that: The substrate is a hollow structure, and the interior of the substrate is filled with heat insulation material.

7. The electrode drying device according to claim 5, characterized in that: The infrared heating unit comprises at least three columns of sub-infrared heating units arranged along the width direction of the substrate, each column of sub-infrared heating units comprises a plurality of infrared heating plates spliced ​​along the length direction of the substrate, and the infrared heating plates in adjacent columns are staggered at the connection points.

8. The electrode drying device according to claim 1, characterized in that: The oven unit comprises a first oven and a second oven which are arranged opposite to each other, a plurality of airflow heating elements are arranged on opposite sides of the first oven and the second oven, and the infrared heating component is arranged between the first oven and the second oven; Infrared heating parts are provided on both sides of the infrared heating component, wherein a first drying channel is formed between the infrared heating part on one side and the first oven, and a second drying channel is formed between the infrared heating part on the other side and the second oven; It also includes a rotating mechanism, which is arranged between the output end of the first drying channel and the input end of the second drying channel, and is used to transport the electrode sheets dried in the first drying channel to the second drying channel.

9. The electrode drying device according to claim 8, characterized in that: It also includes a rotation correction unit, which is arranged between the outlet end of the first drying channel and the inlet end of the second drying channel; The rotary deviation correction unit comprises a deviation correction device, a first passing roller, a second passing roller and a deviation correction detection device, wherein the rotary mechanism is arranged between the first passing roller and the second passing roller; the first passing roller is arranged at the outlet end of the first drying channel, and the second passing roller is arranged at the inlet end of the second drying channel; The deflection correction device is connected to the first roller transmission, and the deflection correction detection device is arranged between the rotating mechanism and the second roller. The deflection correction detection device is used to detect the lateral position offset of the pole piece during the transmission process, and feed the offset back to the deflection correction device. The deflection correction device adjusts the lateral displacement of the first roller according to the offset information to realize the rotational deflection correction of the pole piece.

10. The electrode drying device according to claim 8, characterized in that: The rotary mechanism comprises a driving roller, a first driven roller and a second driven roller; The first driven roller and the second driven roller are respectively arranged on both sides of the active roller, and correspond to the first drying channel and the second drying channel respectively. The first passing roller, the first driven roller, the active roller, the second driven roller, the deviation correction detection device and the second passing roller are arranged in sequence along the tape running direction of the pole piece.

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