Oven and coating device

Abstract

An oven (100) is used for heating an electrode sheet (90), and the oven (100) comprises an oven body (10) and a plurality of heating rollers (20). Among all the heating rollers (20), at least two adjacent heating rollers (20) can rotate reversely relative to the oven body (10). All the heating rollers (20) are distributed in the oven body (10) at intervals in a first direction (X), and all the heating rollers (20) jointly support and guide the electrode sheet (90) to move in the first direction (X).

Description

Oven and coating device

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 2023225074850, filed on September 15, 2023, entitled “Oven and Coating Device,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of battery production equipment, and in particular to an oven and a coating device. Background Art

[0004] 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 the positive electrode sheets, negative electrode sheets and separators, which are then placed in a casing and injected with electrolyte. Among them, the electrode sheets need to go through a coating process during the production process, that is, an active material layer is coated on the current collector of the electrode sheet 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 electrode sheets.

[0005] However, the current electrodes are prone to curling and cracking during the drying process, which reduces the production efficiency of the electrodes.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides an oven and a coating device that can improve problems such as curling and cracking of the electrode during the drying process.

[0008] According to one aspect of the present application, a drying oven is provided for heating items to be dried, the oven comprising a housing and a plurality of heating rollers. At least two adjacent heating rollers are capable of rotating in opposite directions relative to the housing. The plurality of heating rollers are spaced apart within the housing along a first direction. The plurality of heating rollers collectively support and guide the items to be dried along the first direction. An angle a is formed between the heating rollers and the items to be dried, and the angle a satisfies the following conditions: 30° ≤ a ≤ 180°.

[0009] In the technical solution of the embodiment of the present application, because the heating roller and the electrode are heated by contact, and the electrode walking path is set to be similar to a wave shape, the tension of the electrode located between two adjacent heating rollers can be increased to produce a certain binding force on the electrode, which can reduce the probability of the electrode generating drying stress and shrinking in volume after drying, thereby reducing the probability of the electrode curling and cracking.

[0010] In some embodiments, 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 connect to an external heat exchange medium flow path.

[0011] This arrangement can improve the heat stability of each part of the heating roller, so as to evenly heat each part of the pole piece.

[0012] In some embodiments, 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.

[0013] A tensioning roller is set next to the heating roller. Adding the tensioning roller can increase the contact area between the electrode and the heating roller, thereby increasing the wrap angle formed between the electrode and the heating roller, so as to further increase the tension of the electrode located between two adjacent heating rollers, so as to generate a certain binding force on the electrode, which can reduce the probability of the electrode generating drying stress and shrinking volume after drying, thereby reducing the probability of the electrode curling and cracking.

[0014] In some embodiments, the diameter of the tension roller is smaller than the diameter of the heated roller.

[0015] Setting the diameter of the tensioning roller to be smaller than the diameter of the heating roller can increase the contact area between the pole piece and the heating roller, thereby appropriately increasing the wrap angle formed between the pole piece and the heating roller.

[0016] In some embodiments, along the first direction, 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°.

[0017] In this way, the wrap angle formed between the electrode and the heating roller can be maximized, thereby increasing the tension of the electrode between two adjacent heating parts to reduce the phenomenon that the electrode is not easily attached to the heating roller or the electrode curls up.

[0018] In some embodiments, all 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, and both the feed heating roller and the discharge heating roller are 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;

[0019] 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°.

[0020] In this way, the tension on the electrode is greater, which can reduce the phenomenon that the electrode is not easily removed from the heating roller or the electrode is curled.

[0021] In some embodiments, a second hollow cavity is formed inside the tensioning roller, the surface of the tensioning roller is used to tension the workpiece to be dried, and the second hollow cavity is used to connect to an external heat exchange medium flow path.

[0022] 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.

[0023] In some embodiments, the distance between two adjacent heating rollers is L, which satisfies: 400 mm ≤ L < 1400 mm.

[0024] The tension of the electrode can be adjusted by adjusting the distance between two adjacent heating rollers to reduce the probability of the electrode curling during the drying process.

[0025] In some embodiments, the oven further includes an air supply member, which is disposed on an 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.

[0026] When the heating roller heats the pole piece, the hot air discharged from the air supply member can be blown toward the pole piece, so as to implement a heating method with the heating roller as the main component and the air supply member as the auxiliary component, thereby accelerating the heating efficiency of the pole piece.

[0027] In some embodiments, 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.

[0028] 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.

[0029] In some embodiments, the air supply members provided on the first mounting portion and the air supply members provided on the second mounting portion are arranged alternately, so as to heat the electrode piece in multiple directions at the same time, thereby accelerating the heating speed of the electrode piece.

[0030] In some embodiments, 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 located on the side of the feed end away from the discharge end.

[0031] When the moisture content of the electrode exceeds the preset value, 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.

[0032] In some embodiments, the drying oven further includes a flattening member, which is disposed at the feed end and is used to flatten the items to be dried.

[0033] Before the electrode sheet enters the area where the heating roller is located, the flattening member can flatten the electrode sheet to smooth the surface of the electrode sheet and reduce the probability of wrinkling on the surface of the electrode sheet.

[0034] According to one aspect of the present application, the present application provides a coating device, which includes the oven in the above embodiment.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without inventive work. In the drawings:

[0037] FIG1 is a schematic structural diagram of an oven according to one or more embodiments.

[0038] FIG2 is a partial schematic diagram of a pole piece attached to a heating roller according to one or more embodiments.

[0039] FIG3 is a schematic diagram of the structure of a pole piece attached to a heating roller when traveling according to one or more embodiments.

[0040] FIG4 is a schematic structural diagram of an oven provided with a tensioning roller according to one or more embodiments.

[0041] FIG5 is a schematic structural diagram of an oven provided with a tensioning roller according to one or more embodiments.

[0042] FIG6 is a schematic structural diagram of an oven provided with a tensioning roller according to one or more embodiments.

[0043] FIG. 7 is a schematic structural diagram of an oven according to one or more embodiments having both a first portion and a second portion.

[0044] The accompanying drawings in the specific implementation manner are as follows:

[0045] 100. Oven;

[0046] 10. Box body; 11. Feed end; 12. Discharge end;

[0047] 20. Heating roller; 20a. Feed heating roller; 20b. Discharge heating roller;

[0048] 30. 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. DETAILED DESCRIPTION

[0049] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0051] In the description of the embodiments of this application, the use of technical terms such as "first" and "second" is only used to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0052] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of this application, the term "and / or" is used to describe the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document, if it appears, generally indicates that the related objects are in an "or" relationship.

[0054] In the description of the embodiments of the present application, if it appears, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, if any, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0057] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0058] To meet varying power requirements, batteries can include multiple cells, which can be connected in series, parallel, or hybrid. Hybrid refers to a combination of series and parallel connections. A cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The cell operates primarily through the movement of metal ions between the positive and negative electrode sheets.

[0059] A battery cell is composed of a positive electrode sheet, a negative electrode sheet, and a separator, which are assembled into a bare cell through winding or lamination, then placed in a casing and injected with electrolyte. During the manufacturing process of the electrode sheets (a general term for positive and negative electrode sheets), they need to be dried. When the electrode sheets enter the drying oven, as the moisture content of the electrode sheets decreases, drying stress is formed in the areas of the electrode sheets that shrink due to drying. This drying stress release causes the electrode sheets to curl up inside the oven. After exiting the oven, the curled areas of the electrode sheets are flattened by rollers and are prone to cracking.

[0060] To address issues such as cracking and curling of electrode pieces awaiting drying after entering an oven, some embodiments of the present application provide an oven in which a plurality of heating rollers distributed along a first direction are disposed within the oven housing, with all of the heating rollers jointly supporting and guiding the electrode pieces to be dried along the first direction. Because two adjacent heating rollers rotate in opposite directions relative to the housing, and because the wrap angle formed between the electrode pieces and the heating rollers is relatively large, the electrode pieces can be constrained, thereby reducing the extent of their volume shrinkage during the drying process and minimizing the generation of drying stress, thereby reducing the probability of curling and cracking of the electrode pieces.

[0061] The oven provided in the embodiment of the present application can be used for, but is not limited to, drying lithium battery pole pieces or other materials having a film layer on the surface that need to be dried. The following description will take the pole piece as an example of the object to be dried.

[0062] Referring to FIG. 1 , some embodiments of the present application provide an oven 100 that can be used to heat a workpiece to be dried (e.g., an electrode 90 ). The oven 100 includes a housing 10 and a plurality of heating rollers 20 . Among all the heating rollers 20 , at least two adjacent heating rollers 20 are capable of rotating in opposite directions relative to the housing 10 . The plurality of heating rollers 20 are spaced apart within the housing 10 along a first direction X. All of the heating rollers 20 collectively support and guide the workpiece to be dried along the first direction X. An angle a is formed between the heating rollers 20 and the workpiece to be dried, and the angle a satisfies the following conditions: 30° ≤ a ≤ 180°.

[0063] The shape of the box body 10 may be, but is not limited to, a hexahedron, and a cavity extending along the first direction X may be defined inside the box body 10 .

[0064] During use, the surface of the heating roller 20 can generate heat. The heating method of the heating roller 20 can be, but is not limited to, resistance heating, electromagnetic induction heating, or the introduction of hot oil into the heating roller 20 to increase the surface temperature of the heating roller 20. Two adjacent heating rollers 20 rotate in opposite directions. For example, the heating rollers 20 arranged along the first direction X can rotate in sequence in an alternating clockwise and counterclockwise manner.

[0065] As shown in FIG1 , the housing 10 may include a first end and a second end disposed opposite each other along a first direction X. Multiple heating rollers 20 may be sequentially distributed within the housing 10 from the first end to the second end. To facilitate description of the coordination between the electrode piece 90 and the heating rollers 20, the heating rollers 20 distributed from the first end to the second end may be named the first heating roller, the second heating roller, the third heating roller, and so on.

[0066] Assuming that the electrode piece 90 is fed from the first end to the second end, when the electrode piece 90 is placed on the heating roller 20 and begins feeding, the electrode piece 90 first passes over the top of the first heating roller, then passes under the second heating roller, and then passes over the top of the third heating roller, and so on and so forth, until the electrode piece 90 is delivered to the second end. In other words, the feeding path of the electrode piece 90 is similar to a wave shape. When the electrode piece 90 passes over or under the heating roller 20, the electrode piece 90 can contact the heating roller 20 and form a wrap angle. The wrap angle here refers to the center angle corresponding to the arc formed by the electrode piece 90 in contact with the heating roller 20.

[0067] As shown in Figure 2, when the electrode piece 90 is guided by the heating roller 20, the two contact points between the electrode 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.

[0068] Because the heating roller 20 and the electrode 90 are contact heated, and the tape path of the electrode 90 is set to be similar to a wave shape, the tension of the electrode 90 located between the two adjacent heating rollers 20 can be increased to generate a certain binding force on the electrode 90, which can reduce the probability of the electrode 90 generating drying stress and shrinking in volume after drying, thereby reducing the probability of the electrode 90 curling and cracking.

[0069] It should be noted that the above-mentioned oven 100 can be used alone or in conjunction with a common oven 100. For example, when the weight loss rate of the electrode 90 is greater than 20%, a common oven 100 can be used to dry the electrode 90. When the weight loss rate of the electrode 90 is less than 20%, the oven 100 provided in the embodiment of the present application can be used to reduce the probability of curling and cracking of the electrode 90 after drying.

[0070] Please continue to refer to Figure 1. In some embodiments, 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 the external heat exchange medium flow path.

[0071] The external heat exchange medium flow path may include, but is not limited to, a heat source 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 to the first hollow cavity.

[0072] One end of the first hollow cavity is connected to the heat source, and the other end can be connected to the storage component. When 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 other substances with reduced heat.

[0073] When the heating roller 20 is operating, hot oil flows into one end of the first cavity, undergoes heat exchange within the cavity, and then flows out of the other end of the cavity. This process repeats until the heating roller 20 stops. This arrangement improves the heat consistency of various parts of the heating roller 20, thereby uniformly heating all parts of the pole piece 90.

[0074] In other embodiments, the storage element is provided with a heating device and is connected to an external heat exchange medium flow path. In this way, the heating device can heat the coolant in the storage element and re-transfer it to the first hollow cavity for heat exchange, thereby achieving recycling.

[0075] As shown in FIG. 3 , 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°.

[0076] Controlling the wrap angle within a certain range can prevent the wrap angle from being too large or too small. If the wrap angle is too large, it means that the contact area between the pole piece 90 and the heating roller 20 is large, and the friction between the pole piece 90 and the heating roller 20 is large. In this case, the pole piece 90 may be stuck to the heating roller 20 and difficult to fall off.

[0077] If the 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 the 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.

[0078] Therefore, by controlling the wrap angle within a certain range, the electrode piece 90 can have a more appropriate tension, thereby reducing the phenomenon that the electrode piece 90 is not easily attached to the heating roller 20 or the electrode piece 90 is curled.

[0079] Please refer to FIG. 4 . In some embodiments, 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 .

[0080] The tensioning roller 30 and the heating roller 20 are arranged in parallel, and the tensioning roller 30 and the heating roller 20 rotate in different directions. In some examples, as shown in FIG4 , a tensioning roller 30 is provided on the same side of each heating roller 20 along the first direction X. In other examples, as shown in FIG5 , a tensioning roller 30 is provided on both sides of the heating roller 20 along the first direction X.

[0081] Because the pole piece 90 has a wave-like belt path when passing through the heating roller 20 and the tensioning roller 30, compared with not setting the tensioning roller 30 next to the heating roller 20, 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 the 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 volume after drying, thereby reducing the probability of the pole piece 90 curling and cracking.

[0082] Continuing to refer to FIG. 5 , in some embodiments, the diameter of the tension roller 30 is smaller than the diameter of the heating roller 20 .

[0083] Compared with setting the diameter of the tensioning roller 30 to be greater than or equal to 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.

[0084] In summary, 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.

[0085] Referring to FIG. 5 , in some embodiments, along the first direction X, a tensioning roller 30 is provided on both sides of each heating roller 20 , and 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°.

[0086] For example, as shown in FIG5 , when the pole piece 90 is placed on the heating roller 20 for tape transport, the heating roller 20 equipped with two tensioning rollers 30 is considered as a set of heating sections. Taking one set of heating sections as an example, the tape transport path of the pole piece 90 is roughly wavy, with the pole piece 90 passing around the first tensioning roller 30, the heating roller 20, and the second tensioning roller 30 in sequence. At this time, the wrap angle formed between the pole piece 90 and the heating roller 20 can be as close to 180° as possible.

[0087] This process is repeated, and the pole piece 90 has the same running path in each group of heating parts, that is, the wrap angles formed between each heating roller 20 and the pole piece 90 are equal.

[0088] The above solution can maximize the wrap angle formed between the electrode 90 and the heating roller 20, thereby increasing the tension of the electrode 90 located between two adjacent heating parts, so as to reduce the phenomenon that the electrode 90 is not easily attached to the heating roller 20 or the electrode 90 is curled.

[0089] Please refer to Figure 6. In some embodiments, 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 body 10, and the discharge heating roller 20b is located at the discharge end 12 of the box body 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 facing 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°.

[0090] For example, as shown in FIG6 , the feed end 11 and the discharge end 12 of the box body 10 can be distributed along the first direction X, with the heating roller 20 closest to the feed end 11 being considered the feed heating roller 20a, and the heating roller 20 closest to the discharge end 12 being considered the discharge heating roller 20b. The feed heating roller 20a and the discharge heating roller 20b are each equipped with a tensioning roller 30, while the remaining heating rollers 20 can each be equipped with two tensioning rollers 30. When the pole piece 90 is placed on the heating roller 20 for tape movement, the tape movement path of the pole piece 90 is roughly wavy. At this time, 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 of the pole piece 90 being attached to the heating roller 20 and not easily falling off or curling.

[0091] In some embodiments, the tension roller 30 may have only a transmission function, or may have both a transmission function and a heating function.

[0092] When the tensioning roller 30 has both transmission and heating functions, a second hollow cavity is formed inside the tensioning roller 30. The surface of the tensioning roller 30 is used to tension the workpiece to be dried, and the second hollow cavity is used to connect to the external heat exchange medium flow path.

[0093] When the tension roller 30 is operating, hot oil flows into one end of the second cavity, undergoes heat exchange within the cavity, and then flows out of the other end. This process repeats until the tension roller 30 stops operating. This configuration improves the heat consistency of various parts of the tension roller 30, thereby uniformly heating all parts of the electrode sheet 90. The tension roller 30 and the heating roller 20 can heat the electrode sheet 90 simultaneously, accelerating the heating of the electrode sheet 90.

[0094] In some embodiments, the distance between two adjacent heating rollers 20 is L, which satisfies the following relationship: 400 mm ≤ L < 1400 mm.

[0095] As shown in FIG. 6 , L refers to the shortest distance between the roller surfaces of two adjacent heating rollers 20 .

[0096] For example, as shown in Figure 6, 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°. In this case, the heating roller 20 can be used to control the torque and thus the tension of the pole piece 90, so that the restraining force of the pole piece 90 is greater, which can reduce the probability of the pole piece 90 curling due to drying.

[0097] In other examples, as shown in FIG7 , the spacing between two adjacent heating rollers 20 along the first direction X is 500 mm, and the wrap angle formed between each heating roller 20 and the pole piece 90 is 45°. When the heating rollers 20 are heated to 200°C, the pole piece 90 can reduce its weight loss rate to 1% after moving 5 meters within the oven 100, and the pole piece 90 remains flat within the oven 100 without curling.

[0098] In this way, the tension of the electrode piece 90 can be adjusted by adjusting the distance between two adjacent heating rollers 20, so as to reduce the probability of curling of the electrode piece 90 during the drying process.

[0099] Referring to FIG. 7 , in some embodiments, the oven 100 further includes an air supply member 40 . The air supply member 40 is disposed on an inner wall of the oven 100 , and an air supply port of the air supply member 40 is disposed toward the direction where the heating roller 20 is located.

[0100] 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 .

[0101] When 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 .

[0102] Please refer to Figure 7. In some embodiments, 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.

[0103] Both the first mounting portion 50 and the second mounting portion 60 can extend along the first direction X. The first mounting portion 50 and the second mounting portion 60 are spaced apart, with space reserved between them for the electrode plate 90 to pass through. The location of the air supply member 40 can be determined based on actual conditions. For example, in some examples, the air supply member 40 is mounted on either the first mounting portion 50 or the second mounting portion 60. In other examples, the air supply member 40 is mounted on both the first mounting portion 50 and the second mounting portion 60.

[0104] 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.

[0105] Specifically in some embodiments, 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.

[0106] For example, 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. In this way, the electrode piece 90 can be heated in multiple directions at the same time, thereby accelerating the heating speed of the electrode piece 90.

[0107] Please continue to refer to Figure 7. In some embodiments, the drying oven 100 further 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.

[0108] 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 the 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.

[0109] Please refer to FIG. 7 . In some embodiments, the drying oven 100 further includes a flattening member 80 . The flattening member 80 is disposed at the feed end 11 and is used to flatten the objects to be dried.

[0110] 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.

[0111] In addition, 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. For details about the oven 100, please refer to the relevant contents described above.

[0112] Referring to Figure 7 , in a specific example, a housing 10 includes a feed end 11 and a discharge end 12 arranged along a first direction X. Air supply members 40 and heating rollers 20 are disposed within the housing 10 at intervals along the first direction X, with the spacing between adjacent heating rollers 20 being 500 mm. Furthermore, a moisture detector 70 and a flattening member 80 are disposed within the housing 10. The moisture detector 70 is located near the heating rollers 20 at the feed end 11, and the flattening member 80 is located on the side of the moisture detector 70 facing away from the discharge end 12.

[0113] When the electrode 90 enters the box 10, the electrode 90 first passes through the flattening member 80 and is flattened by it to reduce the wrinkles formed on the surface of the electrode 90. Subsequently, the electrode 90 can be detected by the moisture detector 70. When the moisture content of the electrode 90 is higher than the preset moisture content, the oven 100 stops running to remind the user to replace the electrode 90 with a lower moisture content. When the electrode 90 meets the requirements, the electrode 90 continues to move forward and enters the area where the heating roller 20 is located. The wrap angle formed between the electrode 90 and the heating roller 20 is 45°. The heating roller 20 and the air supply member 40 can heat the electrode 90 at the same time until the electrode 90 is discharged from the discharge end 12.

[0114] Since the wrap angle formed between the electrode piece 90 and the heating roller 20 is relatively large, the tension of the electrode piece 90 can be increased, thereby reducing the probability of curling and cracking of the electrode piece 90 during the drying process.

[0115] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An oven for heating a dried object, wherein: include: Box; A plurality of heating rollers, among which at least two adjacent heating rollers can rotate in opposite directions relative to the housing, the plurality of heating rollers are distributed in the housing at intervals along a first direction, and all the heating rollers jointly support and guide the object to be dried to travel along the first direction; An angle a is formed between the heating roller and the object to be dried, and the angle a satisfies: 30°≤a≤180°.

2. The oven according to claim 1, wherein: 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 object to be dried, and the first hollow cavity is used to access an external heat exchange medium flow path.

3. The oven according to any one of claims 1 to 2, wherein: The oven further comprises a tensioning roller, each of the heating rollers 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.

4. The oven according to claim 3, wherein: The diameter of the tension roller is smaller than the diameter of the heating roller.

5. The oven according to claim 3, wherein: Along the first direction, each heating roller is provided with a tensioning roller on both sides, 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°.

6. The oven according to claim 3, wherein: 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 object to be dried, and the wrap angle is less than or equal to 180°.

7. The oven according to claim 3, wherein: 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.

8. The oven according to any one of claims 1 to 7, wherein: The distance between two adjacent heating rollers is L, which satisfies: 400mm≤L<1400mm.

9. The oven according to any one of claims 1 to 8, wherein The oven further comprises an air supply member, which is arranged on the inner wall of the oven, and an air supply port of the air supply member is arranged towards the direction where the heating roller is located.

10. The oven according to claim 9, wherein: 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 the air supply member.

11. The oven according to claim 10, wherein: The air supply members arranged on the first installation portion and the air supply members arranged on the second installation portion are arranged alternately.

12. The oven according to any one of claims 1 to 11, wherein 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 the first direction, the heating roller is located between the feed end and the discharge end, and the moisture detector is arranged on a side of the feed end away from the discharge end.

13. The oven according to claim 12, wherein: The drying oven further comprises a flattening member, which is arranged at the feeding end and is used for flattening the object to be dried.

14. A coating device, wherein: Comprising an oven as described in any one of claims 1-13.

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