WO2025055152A1 - 烘箱及涂布装置 - Google Patents

烘箱及涂布装置 Download PDF

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Publication number
WO2025055152A1
WO2025055152A1 PCT/CN2023/136779 CN2023136779W WO2025055152A1 WO 2025055152 A1 WO2025055152 A1 WO 2025055152A1 CN 2023136779 W CN2023136779 W CN 2023136779W WO 2025055152 A1 WO2025055152 A1 WO 2025055152A1
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WO
WIPO (PCT)
Prior art keywords
heating
roller
heating roller
oven
pole piece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2023/136779
Other languages
English (en)
French (fr)
Other versions
WO2025055152A9 (zh
Inventor
刘明丽
商红武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of WO2025055152A1 publication Critical patent/WO2025055152A1/zh
Publication of WO2025055152A9 publication Critical patent/WO2025055152A9/zh
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery production equipment, and in particular to an oven and a coating device.
  • the battery In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles.
  • the battery consists of a box and multiple battery cells contained in the box.
  • the battery cells are assembled into electrode assemblies (bare cells) by winding or laminating positive electrode sheets, negative electrode sheets and diaphragms, and then loaded into a shell and injected with electrolyte.
  • the pole piece needs to go through a coating process during the production process, that is, an active material layer is coated on the current collector of the pole piece to form a coating area on one side of the current collector. After the coating is completed, it needs to be dried to obtain the required pole piece.
  • the current electrodes are prone to curling and cracking during the drying process, which reduces the production efficiency of the electrodes.
  • the present application provides an oven and a coating device, which can improve the problems of curling, cracking, etc. of the electrode during the drying process.
  • a drying oven for heating a workpiece to be dried, the drying oven comprising a housing and a plurality of heating rollers.
  • the plurality of heating rollers can rotate in opposite directions relative to the housing, the plurality of heating rollers are spaced apart in the housing along a first direction, all the heating rollers jointly support and guide the workpiece to be dried to travel along the first direction, and a wrap angle a is formed between the heating rollers and the workpiece to be dried, and the wrap angle a satisfies: 30° ⁇ a ⁇ 180°.
  • the tension of the pole piece between two adjacent heating rollers can be increased to produce a certain binding force on the pole piece, which can reduce the probability of the pole piece generating drying stress and shrinking in volume after drying, thereby reducing the probability of the pole piece curling and cracking.
  • a first hollow cavity is formed inside the heating roller, the heating roller is rotatably connected to the box body, the surface of the heating roller is used to tension the workpiece to be dried, and the first hollow cavity is used to access an external heat exchange medium flow path.
  • Such an arrangement can improve the heat stability of each part of the heating roller, so as to evenly heat each part of the pole piece.
  • the oven further comprises a tensioning roller, each heating roller is equipped with at least one tensioning roller, the tensioning roller and the heating roller rotate in opposite directions, and both the heating roller and the tensioning roller are used to guide the pole piece.
  • a tensioning roller is arranged next to the heating roller. Adding the tensioning roller can increase the contact area between the pole piece and the heating roller, thereby increasing the wrap angle formed between the pole piece and the heating roller, so as to further increase the tension of the pole piece located between two adjacent heating rollers, so as to produce a certain binding force on the pole piece, which can reduce the probability of the pole piece generating drying stress and shrinking volume after drying, thereby reducing the probability of the pole piece curling and cracking.
  • the diameter of the tension roller is smaller than the diameter of the heated roller.
  • the diameter of the tension roller By setting the diameter of the tension roller to be smaller than the diameter of the heating roller, the contact area between the pole piece and the heating roller can be increased, thereby appropriately increasing the wrap angle formed between the pole piece and the heating roller.
  • a tensioning roller is provided on both sides of each heating roller, and a wrap angle is formed between the heating roller and the object to be dried, and the wrap angle is less than or equal to 180°.
  • the wrap angle formed between the pole piece and the heating roller can be maximized, thereby increasing the tension of the pole piece between two adjacent heating parts to reduce the phenomenon that the pole piece is attached to the heating roller and is not easy to fall off or the pole piece is curled.
  • all the heating rollers include a feed heating roller and a discharge heating roller, the feed heating roller is located at the feed end of the box, the discharge heating roller is located at the discharge end of the box, the feed heating roller and the discharge heating roller are each equipped with a tensioning roller, and the tensioning roller of the feed heating roller and the tensioning roller of the discharge heating roller are arranged facing each other;
  • the remaining heating rollers are each equipped with a tensioning roller on both sides along the first direction, and a wrap angle is formed between the heating rollers and the workpiece to be dried, and the wrap angle is less than or equal to 180°.
  • the tension on the pole piece is greater, which can reduce the phenomenon that the pole piece is not easy to fall off when attached to the heating roller or the pole piece is curled.
  • a second hollow cavity is formed inside the tensioning roller, the surface of the tensioning roller is used to tension the object to be dried, and the second hollow cavity is used to access an external heat exchange medium flow path.
  • the heat stability of each part of the tensioning roller can be improved to uniformly heat each part of the pole piece.
  • the tensioning roller and the heating roller can heat the pole piece at the same time, which can speed up the heating speed of the pole piece.
  • the distance between two adjacent heating rollers is L, which satisfies: 400 mm ⁇ L ⁇ 1400 mm.
  • the tension of the electrode sheet can be adjusted by adjusting the distance between two adjacent heating rollers to reduce the probability of curling of the electrode sheet during the drying process.
  • the oven further comprises an air supply member, which is disposed on the inner wall of the oven, and an air supply port of the air supply member is disposed toward the direction where the heating roller is located.
  • the hot air discharged from the air supply member can be blown toward the pole piece, so as to implement a heating method in which the heating roller is the main heating member and the air supply member is the auxiliary heating member, thereby accelerating the heating efficiency of the pole piece.
  • the oven further includes a first mounting portion and a second mounting portion, the heating roller is disposed between the first mounting portion and the second mounting portion, and at least one of the first mounting portion and the second mounting portion is provided with an air supply member.
  • the above arrangement expands the positions where the air supply components can be installed and enriches the diversity of the internal structure of the oven.
  • the air supply members provided on the first mounting portion and the air supply members provided on the second mounting portion are arranged alternately. At the same time, the electrode is heated in multiple directions to speed up the heating speed of the electrode.
  • the oven also includes a moisture detector
  • the box body includes a feed end and a discharge end, the feed end and the discharge end are arranged opposite to each other along a first direction, the heating roller is located between the feed end and the discharge end, and the moisture detector is arranged on the side of the feed end away from the discharge end.
  • the oven will stop running to remind the user that the moisture content of the electrode to be tested is too high and the user needs to replace the electrode with a lower moisture content.
  • the drying oven further comprises a flattening member, which is disposed at the feeding end and is used to flatten the objects to be dried.
  • the flattening member Before the pole piece enters the area where the heating roller is located, the flattening member can flatten the pole piece to smooth the surface of the pole piece and reduce the probability of wrinkling on the surface of the pole piece.
  • the present application provides a coating device, which includes the oven in the above embodiment.
  • FIG. 1 is a schematic structural diagram of an oven according to one or more embodiments.
  • FIG. 2 is a partial schematic diagram of a pole piece attached to a heating roller according to one or more embodiments.
  • FIG. 3 is a schematic diagram of the structure of a pole piece attached to a heating roller belt according to one or more embodiments.
  • FIG. 4 is a schematic structural diagram of an oven provided with a tensioning roller according to one or more embodiments.
  • FIG. 5 is a schematic structural diagram of an oven provided with a tensioning roller according to one or more embodiments.
  • FIG. 6 is a schematic structural diagram of an oven provided with a tension roller according to one or more embodiments.
  • FIG. 7 is a schematic diagram of a structure in which an oven according to one or more embodiments is provided with a first part and a second part at the same time.
  • tensioning roller 40. air supply member; 50. first mounting portion; 60. second mounting portion; 70. moisture detector; 80. flattening member; 90. pole piece; X, first direction.
  • multiple refers to more than two (including two).
  • multiple groups refers to more than two groups (including two groups), and “multiple pieces” refers to more than two pieces (including two pieces).
  • any technical terms such as “installed”, “connected”, “connected”, “fixed” and the like are to be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • installed e.g., it can be a fixed connection, a detachable connection, or an integral one
  • it can be a mechanical connection or an electrical connection
  • it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • the battery mentioned in the embodiments of the present application refers to a battery comprising one or more battery cells to provide a higher voltage and capacity.
  • a battery is a single physical module that can be used to store a large amount of electricity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • a battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery can include multiple battery cells, wherein multiple battery cells can be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator.
  • the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • a battery cell is composed of a positive electrode sheet, a negative electrode sheet and a separator assembled into a bare cell by winding or laminating, then loaded into a shell and injected with electrolyte.
  • the electrode sheet (a general term for the positive electrode sheet and the negative electrode sheet)
  • it is necessary to dry it.
  • the electrode sheet enters the oven, as the moisture content of the electrode sheet decreases, the part of the electrode sheet that shrinks due to drying will form drying stress. The release of this drying stress causes the electrode sheet to curl up inside the oven. After leaving the oven, the curled part of the electrode sheet is flattened by a roller and is prone to cracking.
  • some embodiments of the present application provide an oven, which provides a plurality of heating rollers distributed along a first direction in the oven body, and uses all the heating rollers to support and guide the electrode to be dried along the first direction. Because two adjacent heating rollers rotate in opposite directions relative to the box body, and the wrap angle formed between the electrode and each heating roller is large, the electrode can be restrained to reduce the degree of volume shrinkage of the electrode during the drying process, and reduce the generation of drying stress, thereby reducing the probability of curling and cracking of the electrode.
  • the oven provided in the embodiment of the present application can be used, but is not limited to, for drying lithium battery pole pieces or other materials having a film layer on the surface and needing to be dried.
  • the following description will take the pole piece as an example of the object to be dried.
  • some embodiments of the present application provide an oven 100, which can be used to heat a workpiece to be dried (such as a pole piece 90).
  • the oven 100 includes a housing 10 and a plurality of heating rollers 20.
  • the plurality of heating rollers 20 are distributed in the housing 10 at intervals along a first direction X. All the heating rollers 20 jointly support and guide the workpiece to be dried to run along the first direction X.
  • An angle a is formed between the heating roller 20 and the workpiece to be dried, and the angle a satisfies: 30° ⁇ a ⁇ 180°.
  • the box body 10 may be in a shape of, but not limited to, a hexahedron, and a cavity extending along the first direction X may be defined inside the box body 10 .
  • the heating roller 20 can generate heat on its surface.
  • the heating roller 20 can be heated by, but is not limited to, resistance heating, electromagnetic induction heating, or passing hot oil into the heating roller 20 to increase the surface temperature of the heating roller 20.
  • the rotation directions of two adjacent heating rollers 20 are opposite.
  • the heating rollers 20 arranged along the first direction X can rotate in sequence in an alternating manner of clockwise and counterclockwise.
  • the housing 10 may include a first end and a second end that are arranged opposite to each other along a first direction X. From the first end to the second end, a plurality of heating rollers 20 that are spaced apart may be sequentially distributed in the housing 10. In order to facilitate the description of the matching mode between the pole piece 90 and the heating rollers 20, the heating rollers 20 distributed from the first end to the second end may be named as the first heating roller, the second heating roller, and a third heating roller and the like.
  • the pole piece 90 is fed from the first end to the second end, when the pole piece 90 is placed on the heating roller 20 and starts feeding, the pole piece 90 first goes around the top of the first heating roller, then goes around the bottom of the second heating roller, and then goes around the top of the third heating roller, and so on and so forth, until the pole piece 90 is delivered to the second end.
  • the feeding path of the pole piece 90 is similar to a wave shape.
  • the pole piece 90 can contact the heating roller 20 and form a wrap angle, where the wrap angle refers to the center angle of the arc corresponding to the pole piece 90 in contact with the heating roller 20.
  • the two contact endpoints between the pole piece 90 and the heating roller 20 are b and c.
  • the central angle of the arc formed by connecting b and c is a, that is, the wrap angle a.
  • the tension of the pole piece 90 located between two adjacent heating rollers 20 can be increased to generate a certain binding force on the pole piece 90, which can reduce the probability of the pole piece 90 generating drying stress and shrinking in volume after drying, thereby reducing the probability of the pole piece 90 curling and cracking.
  • the above-mentioned oven 100 can be used alone or in combination with a common oven 100.
  • a common oven 100 can be used to dry the pole piece 90.
  • the oven 100 provided in the embodiment of the present application can be used to reduce the probability of curling and cracking of the pole piece 90 after drying.
  • a first hollow cavity (not shown in the figure) is formed inside the heating roller 20 and is rotatably connected to the box body 10.
  • the surface of the heating roller 20 is used to tension the workpiece to be dried, and the first hollow cavity is used to connect to an external heat exchange medium flow path.
  • the external heat exchange medium flow path may include but is not limited to heat sources and pipes that provide thermal energy such as hot oil and hot air.
  • the heat source may be connected to the first hollow cavity through a pipe to continuously provide heat for the first hollow cavity.
  • One end of the first hollow cavity is connected to the heat source, and the other end can be connected to the storage component.
  • hot oil or the like flows into the first hollow cavity and undergoes heat exchange, it can flow out of the first hollow cavity and enter the storage component, so that the storage component can be used to store hot oil or the like with reduced heat.
  • hot oil can flow in from one end of the first hollow cavity, perform heat exchange in the first hollow cavity, and then flow out from the other end of the first hollow cavity, and repeat this process until the heating roller 20 stops running.
  • This arrangement can improve the heat stability of each part of the heating roller 20, so as to evenly heat each part of the pole piece 90.
  • the storage element is provided with a heating device and is connected to an external heat exchange medium flow path.
  • the heating device can heat the coolant in the storage element and transport it back to the first hollow cavity for heat exchange to achieve recycling.
  • the heating rollers 20 may be staggered along the first direction X, and the wrap angle formed between the pole pieces 90 and a portion of the heating rollers 20 may be equal to 180°.
  • Controlling the wrap angle within a certain range can avoid the wrap angle being too large or too small. If the wrap angle is too large, it means that the pole piece The contact area between the pole piece 90 and the heating roller 20 is large, and the friction force generated between the pole piece 90 and the heating roller 20 is large. At this time, the pole piece 90 may be attached to the heating roller 20 and not easy to fall off.
  • wrap angle is too small, it means that the contact area between the pole piece 90 and the heating roller 20 is smaller, and the friction force generated between the pole piece 90 and the heating roller 20 is smaller. At this time, the tension of the pole piece 90 located between two adjacent heating rollers 20 is smaller, and the pole piece 90 generates drying stress during the drying process and curls up under the action of the drying stress.
  • the pole piece 90 can have a more appropriate tension, so as to reduce the phenomenon that the pole piece 90 is not easily attached to the heating roller 20 or the pole piece 90 is curled.
  • the oven 100 further includes a tensioning roller 30 .
  • Each heating roller 20 is equipped with at least one tensioning roller 30 .
  • the tensioning roller 30 and the heating roller 20 rotate in opposite directions. Both the heating roller 20 and the tensioning roller 30 are used to support the pole piece 90 .
  • the tension roller 30 and the heating roller 20 are arranged in parallel, and the tension roller 30 and the heating roller 20 rotate in different directions.
  • a tension roller 30 is provided on the same side of each heating roller 20 along the first direction X.
  • a tension roller 30 is provided on both sides of the heating roller 20 along the first direction X.
  • adding the tensioning roller 30 can increase the contact area between the pole piece 90 and the heating roller 20, thereby increasing the wrap angle formed between the pole piece 90 and the heating roller 20, so as to further increase the tension of the pole piece 90 located between two adjacent heating rollers 20, so as to generate a certain binding force on the pole piece 90, which can reduce the probability of the pole piece 90 generating drying stress and shrinking in volume after drying, thereby reducing the probability of the pole piece 90 curling and cracking.
  • the diameter of the tension roller 30 is smaller than the diameter of the heating roller 20 .
  • the embodiment of the present application sets the diameter of the tensioning roller 30 to be smaller than the diameter of the heating roller 20, which can increase the contact area between the pole piece 90 and the heating roller 20, thereby increasing the wrap angle formed between the pole piece 90 and the heating roller 20.
  • setting the diameter of the tension roller 30 to be smaller than the diameter of the heating roller 20 can increase the contact area between the pole piece 90 and the heating roller 20, thereby appropriately increasing the wrap angle formed between the pole piece 90 and the heating roller 20.
  • a tensioning roller 30 is provided on both sides of each heating roller 20 .
  • a wrap angle is formed between the heating roller 20 and the object to be dried, and the wrap angle is less than or equal to 180°.
  • the heating roller 20 is equipped with two tension rollers 30 as a group of heating parts.
  • the belt conveying path of the pole piece 90 is roughly wavy, and the pole piece 90 sequentially passes around the first tension roller 30, the heating roller 20, and the second tension roller 30.
  • the wrap angle formed between the pole piece 90 and the heating roller 20 can be as close to 180° as possible.
  • the above solution can maximize the wrap angle formed between the pole piece 90 and the heating roller 20, thereby increasing the tension of the pole piece 90 between two adjacent heating parts, so as to reduce the possibility that the pole piece 90 is attached to the heating roller 20 and is not easy to fall off or The pole piece 90 shows a curling phenomenon.
  • all the heating rollers 20 include a feed heating roller 20a and a discharge heating roller 20b.
  • the feed heating roller 20a is located at the feed end 11 of the box 10, and the discharge heating roller 20b is located at the discharge end 12 of the box 10.
  • the feed heating roller 20a and the discharge heating roller 20b are both equipped with a tensioning roller 30.
  • the tensioning roller 30 of the feed heating roller 20a and the tensioning roller 30 of the discharge heating roller 20b are arranged opposite to each other.
  • the remaining heating rollers 20 are each equipped with a tensioning roller 30 on both sides along the first direction X, and a wrap angle is formed between the heating roller 20 and the workpiece to be dried, and the wrap angle is less than or equal to 180°.
  • the feed end 11 and the discharge end 12 of the box body 10 can be distributed along the first direction X, and the heating roller 20 closest to the feed end 11 is regarded as the feed heating roller 20a, and the heating roller 20 closest to the discharge end 12 is regarded as the discharge heating roller 20b.
  • the feed heating roller 20a and the discharge heating roller 20b are each equipped with a tensioning roller 30, and the remaining heating rollers 20 can be equipped with two tensioning rollers 30.
  • the wrap angle formed between each heating roller 20 and the pole piece 90 is roughly equal to 180°, and the tension on the pole piece 90 is relatively large, which can reduce the phenomenon that it is not easy to fall off from the heating roller 20 or the pole piece 90 is curled.
  • the tension roller 30 may have only a transmission function, or may have both a transmission function and a heating function.
  • a second hollow cavity is formed inside the tensioning roller 30 , the surface of the tensioning roller 30 is used to tension the object to be dried, and the second hollow cavity is used to access an external heat exchange medium flow path.
  • the distance between two adjacent heating rollers 20 is L, which satisfies: 400 mm ⁇ L ⁇ 1400 mm.
  • L refers to the shortest distance between the roller surfaces of two adjacent heating rollers 20 .
  • each heating roller 20 is equipped with a tensioning roller 30, the spacing between the tensioning rollers 30 corresponding to two adjacent heating rollers 20 is 200 mm, and the wrap angle formed between each heating roller 20 and the pole piece 90 is 180°.
  • the heating roller 20 can be used to control the torque and thus the tension of the pole piece 90, so that the binding force of the pole piece 90 is larger, which can reduce the probability of the pole piece 90 drying and curling.
  • the spacing between two adjacent heating rollers 20 is 500 mm, and the wrap angle formed between each heating roller 20 and the pole piece 90 is 45°.
  • the heating roller 20 is heated to 200° C., after the pole piece 90 moves 5 m in the oven 100, the weight loss rate of the pole piece 90 obtained can be reduced to 1%, and the pole piece 90 is flat and has no curling in the oven 100.
  • the tension of the pole piece 90 can be adjusted by adjusting the distance between two adjacent heating rollers 20 to reduce the probability of curling of the pole piece 90 during the drying process.
  • the oven 100 further includes an air supply member 40 .
  • the air supply member 40 is disposed on the oven 100 .
  • the air supply port of the air supply member 40 is arranged toward the direction where the heating roller 20 is located.
  • the air supply member 40 may be an air nozzle disposed in the oven 100 , and the number of the air supply member 40 and the heating roller 20 may be one-to-one corresponding, or the number of the air supply member 40 may be more than the heating roller 20 .
  • the heating roller 20 heats the pole piece 90 , the hot air discharged from the air supply member 40 can be blown toward the pole piece 90 , so that the heating roller 20 is the main heating member and the air supply member 40 is the auxiliary heating member, thereby accelerating the heating efficiency of the pole piece 90 .
  • the oven 100 further includes a first mounting portion 50 and a second mounting portion 60 .
  • the heating roller 20 is disposed between the first mounting portion 50 and the second mounting portion 60 .
  • At least one of the first mounting portion 50 and the second mounting portion 60 is provided with an air supply member 40 .
  • the first mounting portion 50 and the second mounting portion 60 can both be extended along the first direction X, and the first mounting portion 50 and the second mounting portion 60 are spaced apart, and a space is reserved between the two for the pole piece 90 to run.
  • the setting position of the air supply member 40 can be determined according to actual conditions.
  • the first mounting portion 50 or the second mounting portion 60 is installed with the air supply member 40.
  • the first mounting portion 50 and the second mounting portion 60 are both provided with the air supply member 40.
  • the above arrangement expands the positions where the air supply member 40 can be installed and enriches the diversity of the internal structure of the oven 100.
  • the air supply members 40 provided on the first installation portion 50 and the air supply members 40 provided on the second installation portion 60 are arranged alternately.
  • the air outlet of the air supply member 40 on the first mounting portion 50 can be arranged toward the heating roller 20, and the air outlet of the air supply member 40 on the second mounting portion 60 can be arranged toward the area between two adjacent heating rollers 20.
  • the pole piece 90 can be heated in multiple directions at the same time to accelerate the heating speed of the pole piece 90.
  • the drying oven 100 also includes a moisture detector 70.
  • the box body 10 includes a feed end 11 and a discharge end 12. The feed end 11 and the discharge end 12 are arranged opposite to each other along the first direction X.
  • the heating roller 20 is located between the feed end 11 and the discharge end 12.
  • the moisture detector 70 is arranged on the side of the feed end 11 away from the discharge end 12.
  • the electrode 90 Before the electrode 90 enters the area where the heating roller 20 is located, it can first pass through the moisture detector 70.
  • the moisture detector 70 can detect the moisture inside the electrode 90. When the moisture content of the electrode 90 exceeds a preset value, the oven 100 will stop running to remind the user that the moisture content of the electrode 90 to be tested is too high, and the user needs to replace the electrode 90 with a lower moisture content.
  • the drying oven 100 further includes a flattening member 80 .
  • the flattening member 80 is disposed at the feeding end 11 .
  • the flattening member 80 is used to flatten the objects to be dried.
  • the pressing member can be a flattening roller, which can be arranged on the side of the moisture detector 70 away from the discharge end 12. Before the electrode 90 enters the area where the heating roller 20 is located, the flattening member 80 can flatten the electrode 90 to smooth the surface of the electrode 90 and reduce the probability of wrinkling on the surface of the electrode 90.
  • some embodiments of the present application further provide a coating device.
  • the coating device includes the oven 100 provided in any of the above embodiments.
  • the oven 100 please refer to the relevant contents recorded above.
  • the box 10 includes a feed end 11 and a discharge end 12 distributed along a first direction X.
  • the box 10 is provided with air supply members 40 and heating rollers 20 spaced apart along the first direction X.
  • the spacing between the rollers 20 is 500 mm.
  • a moisture detector 70 and a flattening member 80 are also provided in the box 10. The moisture detector 70 is located near the heating roller 20 at the feed end 11, and the flattening member 80 is located on the side of the moisture detector 70 away from the discharge end 12.
  • the electrode piece 90 When the electrode piece 90 enters the box 10, the electrode piece 90 first passes through the flattening member 80 and is flattened by it to reduce the wrinkles formed on the surface of the electrode piece 90. Subsequently, the electrode piece 90 can be detected by the moisture detector 70. When the moisture content of the electrode piece 90 is higher than the preset moisture content, the oven 100 stops running to remind the user to replace the electrode piece 90 with a lower moisture content. When the electrode piece 90 meets the demand, the electrode piece 90 continues to move forward and enters the area where the heating roller 20 is located. The wrap angle formed between the electrode piece 90 and the heating roller 20 is 45°. The heating roller 20 and the air supply member 40 can heat the electrode piece 90 at the same time until the electrode piece 90 is discharged from the discharge end 12.
  • the wrap angle formed between the pole piece 90 and the heating roller 20 is relatively large, the tension of the pole piece 90 can be increased, thereby reducing the probability of curling and cracking of the pole piece 90 during the drying process.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

一种烘箱(100)用于对极片(90)进行加热，烘箱(100)包括箱体(10)和多个加热辊(20)。全部加热辊(20)中，至少两个相邻的加热辊(20)能够相对箱体(10)反向转动，全部加热辊(20)沿第一方向(X)间隔分布于箱体(10)内，全部加热辊(20)共同承托并引导极片(90)沿第一方向(X)走带。

Description

烘箱及涂布装置
交叉引用
本申请引用于2023年09月15日递交的名称为“烘箱及涂布装置”的第2023225074850号中国专利申请，其通过引用被全部并入本申请。
技术领域
本申请涉及电池生产设备领域，特别是涉及一种烘箱及涂布装置。
背景技术
在电动汽车领域，动力电池作为电动汽车的动力源，起着不可替代的重要作用。电池由箱体和容纳于箱体内的多个电池单体构成，电池单体是由正极极片、负极极片和隔膜通过卷绕或者叠片等方式组装成电极组件(裸电芯)，之后装入外壳，再注入电解液后得到的。其中，极片在生产过程中需要经过涂布工艺，即在极片的集流体上涂覆活性物质层，以在集流体的一侧形成涂覆区，当涂覆完成后需要对其进行干燥，以获得所需的极片。
可是目前的极片在干燥过程中容易出现卷翘、开裂的现象，降低了极片的生产效率。
发明内容
鉴于上述问题，本申请提供一种烘箱及涂布装置，能够改善极片在干燥过程中出现卷翘、开裂等的问题。
根据本申请的一个方面，本申请提供了一种烘箱，用于对待烘干件进行加热，该烘箱包括箱体和多个加热辊。全部加热辊中，至少有两个相邻的加热辊能够相对箱体反向转动，多个加热辊沿第一方向间隔分布于箱体内，全部加热辊共同承托并引导待烘干件沿第一方向走带，加热辊和待烘干件之间形成包角a，包角a满足：30°≤a≤180°。
本申请实施例的技术方案中，因为加热辊和极片为接触式加热，而且将极片的走带路径设置为类似于波浪形，所以可提高位于相邻两个加热辊之间的极片的张力，以对极片产生一定的束缚力，可降低极片在干燥后产生干燥应力并收缩体积的概率，进而降低了极片产生卷翘并开裂的概率。
在一些实施例中，加热辊的内部形成有第一中空腔，加热辊与箱体转动连接，加热辊的表面用于张紧待烘干件，第一中空腔用于接入外部换热介质流路。
如此设置，可提高加热辊各部位的热量的恒定性，以对极片各部位进行均匀加热。
在一些实施例中，烘箱还包括张紧辊，各加热辊配备有至少一个张紧辊，张紧辊和加热辊反向转动，加热辊和张紧辊均用于引导极片。
在加热辊旁设置张紧辊，增加张紧辊可增加极片和加热辊之间的接触面积，从而增大极片和加热辊之间所形成的包角，以进一步提高位于相邻两个加热辊之间的极片的张力，以对极片产生一定的束缚力，可降低极片在干燥后产生干燥应力并收缩体积的概率，进而降低了极片产生卷翘并开裂的概率。
在一些实施例中，张紧辊的直径小于加热辊的直径。
将张紧辊的直径设置为小于加热辊的直径，可提高极片和加热辊之间的接触面积，从而适当增加极片和加热辊之间所形成的包角。
在一些实施例中，沿第一方向，各加热辊的两侧均配备一个张紧辊，加热辊和待烘干件之间形成包角，包角小于等于180°。
如此，可最大化的提高极片和加热辊之间所形成的包角，从而提高位于相邻两个加热部之间的极片的张力，以降低极片出现贴附于加热辊上不容易脱落或者极片出现卷翘的现象。
在一些实施例中，全部加热辊包括进料加热辊和出料加热辊，进料加热辊位于箱体的进料端，出料加热辊位于箱体的出料端，进料加热辊和出料加热辊均配备有一个张紧辊，进料加热辊的张紧辊和出料加热辊的张紧辊相向设置；
其余加热辊在沿第一方向的两侧均配备一个张紧辊，加热辊和待烘干件之间形成包角，包角小于等于180°。
如此，极片所受的张力较大，可降低出现贴附于加热辊上不容易脱落或者极片出现卷翘的现象。
在一些实施例中，张紧辊的内部形成有第二中空腔，张紧辊的表面用于张紧待烘干件，第二中空腔用于接入外部换热介质流路。
可提高张紧辊各部位的热量的恒定性，以对极片各部位进行均匀加热。其中，张紧辊和加热辊可同时对极片进行加热，可加快对极片的加热速度。
在一些实施例中，相邻两个加热辊之间的间距为L，满足：400mm≤L＜1400mm。
可通过调节相邻两个加热辊之间的间距，来调节极片的张力，以降低极片在干燥过程中发生卷翘的概率。
在一些实施例中，烘箱还包括送风件，送风件设于烘箱的内壁，而且送风件的送风口朝向加热辊所在的方向设置。
当加热辊对极片进行加热时，从送风件排出的热风可吹向极片，以进行加热辊为主送风件为辅的加热方式，从而加快极片的加热效率。
在一些实施例中，烘箱还包括第一安装部和第二安装部，加热辊设于第一安装部和第二安装部之间，第一安装部和第二安装部中的至少一者设有送风件。
上述设置，扩大了送风件能够安装的位置，丰富了烘箱内部结构的多样性。
在一些实施例中，第一安装部设置的送风件和第二安装部设置的送风件交错设置。可 同时对极片进行多方位的加热，以加快对极片的加热速度。
在一些实施例中，烘箱还包括水分检测仪，箱体包括进料端和出料端，进料端和出料端沿第一方向相对设置，加热辊位于进料端和出料端之间，水分检测仪设于进料端背离出料端的一侧。
当极片所含的水分超过预设值时，烘箱会停止运行，以提醒用户待检测的极片的水分含量过高，用户需更换水分含量较低的极片。
在一些实施例中，烘箱还包括压平件，压平件设于进料端，压平件用于压平待烘干件。
当极片在进入加热辊所在的区域前，压平件可压平极片，以抚平极片的表面，降低极片的表面起皱的概率。
根据本申请的一个方面，本申请提供了一种涂布装置，其包括上述实施例中的烘箱。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。在附图中：
图1为根据一个或多个实施例中的烘箱的结构示意图。
图2为根据一个或多个实施例中的极片贴附于加热辊时的局部示意图。
图3为根据一个或多个实施例中的极片贴附于加热辊走带时的结构示意图。
图4为根据一个或多个实施例中的烘箱设有张紧辊时的结构示意图。
图5为根据一个或多个实施例中的烘箱设有张紧辊时的结构示意图。
图6为根据一个或多个实施例中的烘箱设有张紧辊时的结构示意图。
图7为根据一个或多个实施例中的烘箱同时设有第一部分和第二部分时的结构示意图。
具体实施方式中的附图标号如下：
100、烘箱；
10、箱体；11、进料端；12、出料端；
20、加热辊；20a、进料加热辊；20b、出料加热辊；
30、张紧辊；40、送风件；50、第一安装部；60、第二安装部；70、水分检测仪；80、压平件；90、极片；X、第一方向。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，若有出现技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述地中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，若有出现术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，若有出现，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，若有出现，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，若有出现，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，若有出现，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容 量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
为了满足不同的使用电力需求，电池可以包括多个电池单体，其中，多个电池单体之间可以串联或并联或混联，混联是指串联和并联的混合。电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔离膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。
电池单体是由正极极片、负极极片和隔离膜通过卷绕或者叠片等方式组装成裸电芯，之后装入壳体，再注入电解液后组成的。在极片(正极极片和负极极片的统称)的生产制造过程中，需要对其进行干燥，当极片进入烘箱后，随着极片水分的降低，极片因干燥而收缩的部位会形成干燥应力，这种干燥应力释放导致极片在烘箱内部形成卷翘，出烘箱后极片的卷翘部位被过辊展平后容易开裂。
为了改善极片等待烘干件在进入烘箱后出现开裂、卷翘等问题，本申请一些实施例提供了一种烘箱，通过在烘箱的箱体内设置沿第一方向分布的多个加热辊，利用全部加热辊共同承托并引导待极片沿第一方向走带。因为相邻两个加热辊相对于箱体反向转动，而且极片和各加热辊之间所形成的包角较大，可对极片进行束缚，以降低在烘干过程中极片体积收缩的程度，并减小干燥应力的产生，从而降低了极片发生卷翘并开裂的概率。
本申请实施例提供的烘箱可以但不限用于对锂电池极片进行烘干或其他表面具有膜层且需要烘干的材料，下文以极片为待烘干件为例进行说明。
请参阅图1，本申请一些实施例提供了一种烘箱100，其可用于对待烘干件(如极片90)进行加热。该烘箱100包括箱体10和多个加热辊20。全部加热辊20中，至少有两个相邻的加热辊20能够相对箱体10反向转动，多个加热辊20沿第一方向X间隔分布于箱体10内，全部加热辊20共同承托并引导待烘干件沿第一方向X走带。加热辊20和待烘干件之间形成包角a，包角a满足：30°≤a≤180°。
箱体10的形状可以但不限于为六面体，箱体10内部可开设有沿第一方向X延伸的容腔。
加热辊20在使用的过程中，其表面能够产生热量，加热辊20的加热方式可以但不限于为电阻加热、电磁感应加热或者是向加热辊20内通入热油等来提高加热辊20表面的温度。相邻设置的两个加热辊20的转动方向相反，例如，沿第一方向X排布的加热辊20可按照顺时针和逆时针交替的方式依次转动。
如图1所示，箱体10可包括沿第一方向X相对设置的第一端和第二端。从第一端至第二端，箱体10内可依次分布多个间隔分布的加热辊20。为了便于说明极片90和加热辊20之间的配合方式，可将从第一端至第二端分布的加热辊20命名为第一加热辊、第二加热辊和 第三加热辊等等。
假设极片90从第一端向第二端走带，将极片90等放置于加热辊20上开始走带时，极片90先绕到第一加热辊的上方，再绕到第二加热辊的下方，再绕到第三加热辊的上方，如此反复，直至极片90被输送至第二端。换言之，极片90的走带路径类似于波浪形。当极片90绕道加热辊20的上方或下方时，极片90能够和加热辊20接触并形成包角，此处的包角指与加热辊20接触的极片90，其形成的圆弧形所对应的圆心角。
如图2所示，极片90被加热辊20引导走带时，极片90和加热辊20之间的两个接触端点分别为b和c。b和c相连所形成的圆弧对应的圆心角为a，即包角a。
因为加热辊20和极片90为接触式加热，而且将极片90的走带路径设置为类似于波浪形，所以可提高位于相邻两个加热辊20之间的极片90的张力，以对极片90产生一定的束缚力，可降低极片90在干燥后产生干燥应力并收缩体积的概率，进而降低了极片90产生卷翘并开裂的概率。
需要说明的是，上述烘箱100可单独使用也可配合普通烘箱100使用，示例性地，当极片90的失重率大于20％时，可使用普通烘箱100对极片90进行烘干。当极片90的失重率小于20％时，可使用本申请实施例所提供的烘箱100，可降低烘干后的极片90出现卷翘并开裂的概率。
请继续参阅图1，在一些实施例中，加热辊20的内部形成有第一中空腔(图中未示出)，且与箱体10转动连接，加热辊20的表面用于张紧待烘干件，第一中空腔用于接入外部换热介质流路。
外部换热介质流路可以但不限于包括提供热油、热空气等热能量的供热源及管道等部件，供热源可通过管道与第一中空腔连通，以便为第一中空腔不断提供热源。
第一中空腔的一端与供热源连通，另一端可与储存件连通，当热油等流入第一中空腔后进行热交换后，可流出第一中空腔并进入储存件，以利用储存件储存热量下降的热油等物质。
在加热辊20工作时，热油可从第一中空腔的一端流入，在第一中空腔内进行热交换后，再从第一中空腔的另一端流出，如此反复，直至加热辊20停止运行。如此设置，可提高加热辊20各部位的热量的恒定性，以对极片90各部位进行均匀加热。
在其他实施例中，储存件设有加热设备并与外部换热介质流路相连通。如此，加热设备可对储存件内的冷却物进行加热，并将其重新输送至第一中空腔内进行热交换，以实现循环使用。
如图3所示，加热辊20可沿第一方向X交错设置，极片90和部分加热辊20之间所形成的包角可等于180°。
将包角控制在一定范围内，可避免包角过大或者过小。如果包角过大，就意味着极片 90和加热辊20之间的接触面积较多，极片90和加热辊20之间所产生的摩擦力较大，此时极片90有可能出现贴附于加热辊20上不容易脱落的现象。
如果包角过小，就意味着极片90和加热辊20之间的接触面积较少，极片90和加热辊20之间所产生的摩擦力较小，此时，位于相邻两个加热辊20之间的极片90的张力较小，极片90在干燥过程中产生干燥应力，并在干燥应力的作用下发生卷翘。
因此，将包角的控制在一定范围内，可使得极片90具有较适宜的张力，以降低极片90出现贴附于加热辊20上不容易脱落或者极片90出现卷翘的现象。
请参阅图4，在一些实施例中，烘箱100还包括张紧辊30，各加热辊20配备有至少一个张紧辊30，张紧辊30和加热辊20反向转动，加热辊20和张紧辊30均用于承托极片90。
张紧辊30和加热辊20平行设置，张紧辊30和加热辊20分别沿不同的方向转动，在一些示例中，如图4所示，沿第一方向X，各加热辊20的同一侧设有一个张紧辊30。在另一些示例中，如图5所示，沿第一方向X，加热辊20的两侧均设有一个张紧辊30。
因为极片90在经过加热辊20和张紧辊30时，其走带路径类似波浪形，所以相对于没有在加热辊20旁设置张紧辊30，增加张紧辊30可增加极片90和加热辊20之间的接触面积，从而增大极片90和加热辊20之间所形成的包角，以进一步提高位于相邻两个加热辊20之间的极片90的张力，以对极片90产生一定的束缚力，可降低极片90在干燥后产生干燥应力并收缩体积的概率，进而降低了极片90产生卷翘并开裂的概率。
请继续参阅图5，在一些实施例中，张紧辊30的直径小于加热辊20的直径。
相对于将张紧辊30的直径设置为大于等于加热辊20的直径，本申请实施例将张紧辊30的直径设置为小于加热辊20的直径，可提高极片90和加热辊20之间的接触面积，从而增加极片90和加热辊20之间所形成的包角。
综上，将张紧辊30的直径设置为小于加热辊20的直径，可提高极片90和加热辊20之间的接触面积，从而适当增加极片90和加热辊20之间所形成的包角。
请参阅图5，在一些实施例中，沿第一方向X，各加热辊20的两侧均配备一个张紧辊30，加热辊20和待烘干件之间形成包角，包角小于等于180°。
示例性地，如图5所示，将极片90放置于加热辊20进行走带时，将加热辊20配备两个张紧辊30看做一组加热部，以其中一组加热部为例，极片90的走带路径大致呈波浪形，极片90依次绕过第一张紧辊30、加热辊20和第二张紧辊30。此时，极片90和加热辊20之间所形成的包角能够尽可能的接近180°。
如此反复，极片90在各组加热部中的走带路径相同，即，各加热辊20和极片90之间所形成的包角相等。
上述方案，可最大化的提高极片90和加热辊20之间所形成的包角，从而提高位于相邻两个加热部之间的极片90的张力，以降低极片90出现贴附于加热辊20上不容易脱落或者 极片90出现a卷翘的现象。
请参阅图6，在一些实施例中，全部加热辊20包括进料加热辊20a和出料加热辊20b，进料加热辊20a位于箱体10的进料端11，出料加热辊20b位于箱体10的出料端12，进料加热辊20a和出料加热辊20b均配备有一个张紧辊30，进料加热辊20a的张紧辊30和出料加热辊20b的张紧辊30相向设置；其余加热辊20在沿第一方向X的两侧均配备一个张紧辊30，加热辊20和待烘干件之间形成包角，包角小于等于180°。
示例性地，如图6所示，箱体10的进料端11和出料端12可沿第一方向X分布，将最靠近进料端11的加热辊20看做进料加热辊20a，将最靠近出料端12的加热辊20看做出料加热辊20b。进料加热辊20a和出料加热辊20b均配备有一个张紧辊30，其余加热辊20则均可配备两个张紧辊30。将极片90放置于加热辊20进行走带时，极片90的走带路径大致呈波浪状。此时，各加热辊20和极片90之间所形成的包角大致等于180°，极片90所受的张力较大，可降低出现贴附于加热辊20上不容易脱落或者极片90出现卷翘的现象。
在一些实施例中，张紧辊30可仅具备传输作用，也可同时具备传输和加热作用。
当张紧辊30同时具备传输和加热作用时，张紧辊30的内部形成有第二中空腔，张紧辊30的表面用于张紧待烘干件，第二中空腔用于接入外部换热介质流路。
在张紧辊30工作时，热油可从第二中空腔的一端流入，在第二中空腔内进行热交换后，再从第二中空腔的另一端流出，如此反复，直至张紧辊30停止运行。如此设置，可提高张紧辊30各部位的热量的恒定性，以对极片90各部位进行均匀加热。其中，张紧辊30和加热辊20可同时对极片90进行加热，可加快对极片90的加热速度。
在一些实施例中，相邻两个加热辊20之间的间距为L，满足：400毫米(mm)≤L＜1400毫米(mm)。
如图6所示，L是指相邻两个加热辊20的辊面之间的最短距离。
示例性地，如图6所示，各加热辊20均配备有张紧辊30，相邻两个加热辊20对应的张紧辊30之间的间距为200mm，各加热辊20和极片90之间所形成的包角为180°。此时，可利用加热辊20来控制扭矩从而控制极片90的张力，以使得极片90的束缚力较大，可降低极片90发生干燥卷翘的概率。
在另一些示例中，如图7所示，沿第一方向X，相邻两个加热辊20之间的间距为500mm，各加热辊20和极片90之间所形成的包角为45°。当加热辊20加热到200℃时，极片90在烘箱100内移动5m后，所得到的极片90的失重率可降低到1％，而且极片90在烘箱100内平整无卷翘。
如此，可通过调节相邻两个加热辊20之间的间距，来调节极片90的张力，以降低极片90在干燥过程中发生卷翘的概率。
请参阅图7，在一些实施例中，烘箱100还包括送风件40，送风件40设于烘箱100 的内壁，而且送风件40的送风口朝向加热辊20所在的方向设置。
送风件40可为设置于烘箱100内的风嘴，其与加热辊20之间的数量的关系可为一一对应，或者多于加热辊20。
当加热辊20对极片90进行加热时，从送风件40排出的热风可吹向极片90，以进行加热辊20为主送风件40为辅的加热方式，从而加快极片90的加热效率。
请参阅图7，在一些实施例中，烘箱100还包括第一安装部50和第二安装部60，加热辊20设于第一安装部50和第二安装部60之间，第一安装部50和第二安装部60中的至少一者设有送风件40。
第一安装部50和第二安装部60均可沿第一方向X延伸设置，第一安装部50和第二安装部60间隔设置，两者之间预留有供极片90走带的空间。送风件40的设置位置可根据实际情况确定，例如，在一些示例中，第一安装部50或者第二安装部60安装有送风件40。在另一些示例中，第一安装部50和第二安装部60均设有送风件40。
上述设置，扩大了送风件40能够安装的位置，丰富了烘箱100内部结构的多样性。
具体到一些实施例，第一安装部50设置的送风件40和第二安装部60设置的送风件40交错设置。
例如，第一安装部50上的送风件40的送风口可朝向加热辊20设置，第二安装部60上的送风件40的送风口可朝向相邻两个加热辊20之间的区域设置。如此，可同时对极片90进行多方位的加热，以加快对极片90的加热速度。
请继续参阅图7，在一些实施例中，烘箱100还包括水分检测仪70，箱体10包括进料端11和出料端12，进料端11和出料端12沿第一方向X相对设置，加热辊20位于进料端11和出料端12之间，水分检测仪70设于进料端11背离出料端12的一侧。
当极片90在进入加热辊20所在的区域前，能够先经过水分检测仪70，水分检测仪70能够对极片90内部的水分进行检测，当极片90所含的水分超过预设值时，烘箱100会停止运行，以提醒用户待检测的极片90的水分含量过高，用户需更换水分含量较低的极片90。
请参阅图7，在一些实施例中，烘箱100还包括压平件80，压平件80设于进料端11，压平件80用于压平待烘干件。
压片件可为展平辊，其可设置于水分检测仪70背离出料端12的一侧，当极片90在进入加热辊20所在的区域前，压平件80可压平极片90，以抚平极片90的表面，降低极片90的表面起皱的概率。
此外，本申请一些实施例还提供了一种涂布装置。该涂布装置包括上述任一实施例提供的烘箱100。关于烘箱100可参见上文记载的相关内容。
请参阅图7，在一具体的示例中，箱体10包括沿第一方向X分布的进料端11和出料端12，箱体10的内部设有沿第一方向X间隔分布的送风件40及加热辊20，相邻两个加热 辊20之间的间距为500mm。其中，箱体10内还设有水分检测仪70和压平件80，水分检测仪70位于进料端11的加热辊20附近，压平件80位于水分检测仪70背离出料端12的一侧。
当极片90进入箱体10时，极片90先经过压平件80并被其压平，以减少极片90表面所形成的褶皱。随后，极片90可被水分检测仪70检测，当极片90所含的水分高于预设的水分时，烘箱100停止运行，以提醒用户更换水分含量更低的极片90。当极片90满足需求时，极片90继续向前走带进入加热辊20所在的区域，极片90和加热辊20之间所形成的包角为45°，加热辊20和送风件40能够同时对极片90进行加热，直至极片90从出料端12排出。
因为极片90和加热辊20之间所形成的包角较大，所以可提高极片90的张力，降低极片90在干燥过程中出现卷翘并开裂的概率。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对申请专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (14)

  1. 一种烘箱，用于对待烘干件进行加热，其中，包括：
    箱体；
    多个加热辊，全部加热辊中，至少有两个相邻的所述加热辊能够相对所述箱体反向转动，所述多个加热辊沿第一方向间隔分布于所述箱体内，全部所述加热辊共同承托并引导所述待烘干件沿所述第一方向走带；
    所述加热辊和所述待烘干件之间形成包角a，所述包角a满足：30°≤a≤180°。
  2. 根据权利要求1所述的烘箱，其中，所述加热辊的内部形成有第一中空腔，所述加热辊与所述箱体转动连接，所述加热辊的表面用于张紧所述待烘干件，所述第一中空腔用于接入外部换热介质流路。
  3. 根据权利要求1-2中任一项所述的烘箱，其中，所述烘箱还包括张紧辊，各所述加热辊配备有至少一个所述张紧辊，所述张紧辊和所述加热辊反向转动，所述加热辊和所述张紧辊均用于引导极片。
  4. 根据权利要求3所述的烘箱，其中，所述张紧辊的直径小于所述加热辊的直径。
  5. 根据权利要求3所述的烘箱，其中，沿所述第一方向，各所述加热辊的两侧均配备一个所述张紧辊，所述加热辊和所述待烘干件之间形成包角，所述包角小于等于180°。
  6. 根据权利要求3所述的烘箱，其中，全部所述加热辊包括进料加热辊和出料加热辊，所述进料加热辊位于所述箱体的进料端，所述出料加热辊位于所述箱体的出料端，所述进料加热辊和所述出料加热辊均配备有一个所述张紧辊，所述进料加热辊的所述张紧辊和所述出料加热辊的所述张紧辊相向设置；
    其余所述加热辊在沿所述第一方向的两侧均配备一个所述张紧辊，所述加热辊和所述待烘干件之间形成包角，所述包角小于等于180°。
  7. 根据权利要求3所述的烘箱，其中，所述张紧辊的内部形成有第二中空腔，所述张紧辊的表面用于张紧所述待烘干件，所述第二中空腔用于接入外部换热介质流路。
  8. 根据权利要求1-7中任一项所述的烘箱，其中，相邻两个所述加热辊之间的间距为L，满足：400mm≤L＜1400mm。
  9. 根据权利要求1-8中任一项所述的烘箱，其中，所述烘箱还包括送风件，所述送风件设于所述烘箱的内壁，而且所述送风件的送风口朝向所述加热辊所在的方向设置。
  10. 根据权利要求9所述的烘箱，其中，所述烘箱还包括第一安装部和第二安装部，所述加热辊设于所述第一安装部和所述第二安装部之间，所述第一安装部和所述第二安装部中的至少一者设有所述送风件。
  11. 根据权利要求10所述的烘箱，其中，所述第一安装部设置的所述送风件和所述第二安装部设置的所述送风件交错设置。
  12. 根据权利要求1-11中任一项所述的烘箱，其中，所述烘箱还包括水分检测仪，所述箱体包括进料端和出料端，所述进料端和所述出料端沿所述第一方向相对设置，所述加热辊位于所述进料端和所述出料端之间，所述水分检测仪设于所述进料端背离所述出料端的一侧。
  13. 根据权利要求12所述的烘箱，其中，所述烘箱还包括压平件，所述压平件设于所述进料端，所述压平件用于压平所述待烘干件。
  14. 一种涂布装置，其中，包括如权利要求1-13中任一项所述的烘箱。
PCT/CN2023/136779 2023-09-15 2023-12-06 烘箱及涂布装置 Pending WO2025055152A1 (zh)

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