Baking apparatus

Abstract

The utility model relates to battery manufacturing technical field, concretely provides a kind of baking equipment, to solve the tension of pole piece in the box of existing baking equipment is not controlled, there is the problem of abnormal risk of running tape.For this purpose, the utility model's baking equipment, including box, conveying roller and heating element;Box is provided with pole piece import and pole piece export;Conveying roller is provided with multiple, multiple conveying roller is rotatably arranged in box, conveying roller is set to be able to convey to be dried pole piece, wherein, the diameter of all or part conveying roller gradually increases along the running tape direction of to be dried pole piece;Heating element is arranged in box, heating element is set to be able to heat to be dried pole piece.In the running tape direction of to be dried pole piece, the diameter of conveying roller gradually increases, even after pole piece elongation can always be wrapped on conveying roller.Effectively maintain the tension of to be dried pole piece, to avoid pole piece from conveying roller drop, reduce the risk of abnormal running tape.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically providing a baking device. Background Technology

[0002] The lithium battery production process is lengthy and involves numerous pieces of equipment. The quality of lithium battery drying equipment has a significant impact on lithium battery performance and cost, making it one of the key pieces of equipment in lithium battery production. Moisture in lithium batteries can cause irreversible damage to their capacity, cycle life, and safety. Therefore, moisture control during battery manufacturing is an extremely important aspect of lithium battery production.

[0003] Roll-to-roll online baking effectively improves the consistency of the baked electrodes. Common roll-to-roll online baking methods utilize hot oil rollers as a heat source, with the electrodes continuously bonded to the rollers at a large 180° wrap angle to ensure heating efficiency. However, due to static friction, this large wrap angle makes it difficult to transmit tension, and the high temperature causes electrode expansion, leading to uncontrolled internal tension and the risk of abnormal belt movement (wrinkling, loosening, tightness, etc.). Furthermore, because the oven is at a high temperature, it is difficult to add other tension control components.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, and to address the issue that the tension of the inner electrode sheet in the oven of existing baking equipment is uncontrolled, which poses a risk of abnormal belt movement.

[0006] This utility model provides a baking device, including a box, a conveyor roller and a heating element;

[0007] The housing is equipped with an electrode inlet and an electrode outlet;

[0008] Multiple conveyor rollers are provided, and the multiple conveyor rollers are rotatably arranged in the box. The conveyor rollers are configured to convey the electrode sheet to be dried, wherein the diameter of all or part of the conveyor rollers gradually increases along the conveying direction of the electrode sheet to be dried.

[0009] The heating element is disposed in the housing and is configured to heat the electrode sheet to be dried.

[0010] With the above-mentioned technical solution, the electrode sheet to be dried gradually elongates as the temperature inside the chamber rises. In the direction the electrode sheet travels, the diameter of the conveyor roller gradually increases. This ingenious design ensures that even after the electrode sheet elongates, it remains wrapped around the conveyor roller. This effectively maintains the tension of the electrode sheet, preventing it from detaching from the conveyor roller or wrinkling. It significantly reduces the risk of belt conveyor malfunctions, ensuring the stability and continuity of production.

[0011] In a specific embodiment of the baking equipment described above, the conveyor roller includes an upper conveyor roller and a lower conveyor roller, which are spaced apart. The electrode sheets to be dried alternately travel on the upper conveyor roller and the lower conveyor roller, thereby forming an S-shaped conveyor.

[0012] When the above technical solution is adopted, the S-shaped conveyor belt can increase the baking length of the electrode sheet to be dried in the chamber and improve the baking efficiency.

[0013] In a specific embodiment of the baking equipment described above, the upper conveyor roller and the lower conveyor roller are arranged in a manner that allows the electrode sheet to be dried to be conveyed in a vertical direction.

[0014] When the above technical solution is adopted, the electrode sheet to be dried is in close contact with the upper and lower conveyor rollers at a large wrap angle, which facilitates the drying of the electrode sheet.

[0015] In a specific embodiment of the baking equipment described above, the diameter of all the conveyor rollers gradually increases along the belt direction of the electrode to be dried.

[0016] In a specific embodiment of the baking equipment described above, the diameter of the adjacent conveyor roller along the conveying direction of the electrode to be dried is increased by any value between 0.03 mm and 0.05 mm.

[0017] In a specific embodiment of the baking equipment described above, a drive motor is also included, which is connected to the conveyor roller via a transmission connection.

[0018] In a specific embodiment of the baking equipment described above, air ducts are provided on the upper and lower sides of the chamber, and air outlets are provided on the air ducts.

[0019] When the above technical solution is adopted, the air vents allow the air inside the box to circulate, making it easier to remove moisture from the box.

[0020] In a specific embodiment of the baking equipment described above, an upper air inlet is provided in the air duct on the upper side of the chamber, and a lower air inlet is provided in the air duct on the lower side of the chamber. Both the upper air inlet and the lower air inlet face the electrode sheet to be dried.

[0021] In a specific embodiment of the baking equipment described above, the heating element is disposed inside the conveyor roller and is configured to heat the conveyor roller.

[0022] When the above technical solution is adopted, the heating element is set inside the conveyor roller, which can save space inside the box. After the heating element heats the conveyor roller, the conveyor roller heats the electrode sheet to be dried.

[0023] In a specific embodiment of the baking equipment described above, the baking equipment further includes a steering roller, which is disposed inside the housing and close to the electrode inlet and the electrode outlet, respectively. The steering roller contacts the electrode to be dried and is configured to change the belt direction of the electrode to be dried.

[0024] When the above technical solution is adopted, after the electrode to be dried enters the chamber, it first passes through a guide roller so that the electrode to be dried can pass through the electrode to be dried in a set direction. Before the electrode to be dried exits the chamber, it finally passes through another guide roller so that the electrode to be dried passes through the electrode outlet in a set direction. Attached Figure Description

[0025] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a structural diagram of the baking equipment.

[0027] List of reference numerals in the attached diagram: 1-Box body; 111-Upper air outlet; 112-Lower air outlet; 12-Electrode inlet; 13-Electrode outlet; 14-Air duct; 2-Transfer roller; 21-Upper transfer roller; 22-Lower transfer roller; 3-Directional roller; 4-Electrode sheet to be dried. Detailed Implementation

[0028] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, although the upper conveyor rollers are described in combination as four in the specification, the number of upper conveyor rollers in this application can obviously be three, five, or six, etc.

[0029] It should be noted that, in the description of this application, unless otherwise explicitly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or other type of connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, in the description of this application, "multiple" refers to at least two. It should be understood that the terms "upper," "lower," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Roll-to-roll online baking effectively improves the consistency of the baked electrodes. Common roll-to-roll online baking methods utilize hot oil rollers as a heat source, with the electrodes continuously bonded to the rollers at a large 180° wrap angle to ensure heating efficiency. However, due to static friction, this large wrap angle makes it difficult to transmit tension, and the high temperature causes electrode expansion, leading to uncontrolled internal tension and the risk of abnormal belt movement (wrinkling, loosening, tightness, etc.). Furthermore, because the oven is at a high temperature, it is difficult to add other tension control components.

[0031] It is important to understand that in existing technologies, the tension of the electrode sheets entering the drying chamber is typically controlled by the winding and unwinding devices. Without considering the friction between the oil rollers and the electrode sheets, the tension of the electrode sheets remains constant. However, due to the continuous 180° large wrap angle contact between the electrode sheets and the oil rollers, static friction affects the tension of the electrode sheets on different oil rollers. Due to the combined effects of the winding and unwinding devices and static friction, the point of minimum electrode tension generally occurs after the electrode sheets have passed through several oil rollers. At this point, the low electrode tension and the elongation of the electrode sheets during drying make them prone to wrinkling and loosening, posing a risk of belt slippage abnormalities.

[0032] like Figure 1 As shown, to address the problem of uncontrolled tension of the electrode sheets inside the oven chamber in existing baking equipment, which poses a risk of abnormal belt movement, this utility model provides a baking device, including a chamber 1, conveyor rollers 2, and a heating element; the chamber 1 is provided with an electrode sheet inlet 12 and an electrode sheet outlet 13; multiple conveyor rollers 2 are provided, and the multiple conveyor rollers 2 are rotatably arranged inside the chamber 1, and the conveyor rollers 2 are configured to convey the electrode sheets 4 to be dried, wherein the diameter of all or part of the conveyor rollers 2 gradually increases along the belt movement direction of the electrode sheets 4 to be dried; the heating element is provided in the chamber 1, and the heating element is configured to heat the electrode sheets 4 to be dried.

[0033] In this way, the electrode sheet 4 to be dried gradually elongates as the temperature inside the chamber 1 rises. Along the belt conveyor direction of the electrode sheet 4, the diameter of the conveyor roller 2 gradually increases. This ingenious design ensures that even after the electrode sheet elongates, it remains wrapped around the conveyor roller 2. This effectively maintains the tension of the electrode sheet 4, preventing it from detaching from the conveyor roller 2 or wrinkling. It greatly reduces the risk of belt conveyor abnormalities, ensuring the stability and continuity of production.

[0034] See further Figure 1 In a preferred embodiment of the baking equipment of this utility model, the baking equipment includes a box body 1, a conveying roller 2, a heating element, a drive motor and a steering roller 3. On both sides of the box body 1, there are electrode inlets 12 and electrode outlets 13 at the same height. The electrode 4 to be dried enters the box body 1 from the electrode inlet 12 and exits the box body 1 through the electrode outlet 13.

[0035] Air ducts 14 are provided on both the upper and lower sides of the housing 1. An upper air vent 111 is provided on the upper air duct 14 of the housing 1, and a lower air vent 112 is provided on the lower air duct 14 of the housing 1. The air vents 111 and 112 allow air to circulate inside the housing 1, facilitating the discharge of moisture from the housing 1.

[0036] It should be noted that the installation of air duct 14 is not mandatory. Those skilled in the art can choose whether to install air duct 14 and the specific structure of air duct 14 based on the specific application scenario. For example, air duct 14 can be installed only on the upper side of housing 1, or only on the lower side of housing 1. Alternatively, air duct 14 can be installed outside housing 1, with the outlets of upper air inlet 111 and lower air inlet 112 communicating with the internal cavity of housing 1.

[0037] It should also be noted that the installation of the upper air vent 111 and the lower air vent 112 is not mandatory, and those skilled in the art can set them according to specific application scenarios. For example, only the upper air vent 111 or only the lower air vent 112 may be installed. Alternatively, the air duct 14 may be located outside the housing 1, and both the upper air vent 111 and the lower air vent 112 may be located inside the housing 1 and connected to the air duct 14.

[0038] Continue to refer to Figure 1The conveyor rollers 2 include four upper conveyor rollers 21 and four lower conveyor rollers 22 spaced apart vertically. The four upper conveyor rollers 21 are located at the same height near the top inside the housing 1, and the two lower conveyor rollers 22 are located at the same height near the bottom inside the housing 1. The electrode sheets 4 to be dried alternately travel on the upper conveyor rollers 21 and lower conveyor rollers 22, forming an S-shaped travel pattern. The electrode sheets 4 to be dried are arranged vertically between the upper conveyor rollers 21 and lower conveyor rollers 22. The S-shaped travel pattern increases the baking length of the electrode sheets 4 within the housing 1, improving baking efficiency. The electrode sheets 4 to be dried are fitted with the upper conveyor rollers 21 and lower conveyor rollers 22 at a large wrap angle, facilitating the drying of the electrode sheets 4. The diameter of all conveyor rollers 2 gradually increases by 0.04 mm along the travel direction of the electrode sheets 4 to be dried.

[0039] Specifically, by Figure 1 Looking from left to right, the diameter of the first upper conveyor roller 21 is 0.04 mm larger than that of the first lower conveyor roller 22; the diameter of the second lower conveyor roller 22 is 0.04 mm larger than that of the first upper conveyor roller 21; the diameter of the second upper conveyor roller 21 is 0.04 mm larger than that of the second lower conveyor roller 22; the diameter of the third lower conveyor roller 22 is 0.04 mm larger than that of the second upper conveyor roller 21; the diameter of the third upper conveyor roller 21 is 0.04 mm larger than that of the third lower conveyor roller 22; the diameter of the fourth lower conveyor roller 22 is 0.04 mm larger than that of the third upper conveyor roller 21; and the diameter of the fourth upper conveyor roller 21 is 0.04 mm larger than that of the fourth lower conveyor roller 22.

[0040] It should be noted that the arrangement of the conveyor rollers 2 is not mandatory. Those skilled in the art can choose the number and specific structure of the conveyor rollers 2 based on the specific application scenario. For example, the number of upper conveyor rollers 21 can be three, five, or six, etc. Similarly, the number of lower conveyor rollers 22 can be three, five, or six, etc. Furthermore, multiple upper conveyor rollers 21 can be located at different heights near the upper side inside the housing 1. Again, multiple lower conveyor rollers 22 can be located at different heights near the lower side inside the housing 1. Finally, the electrode sheet 4 to be dried may pass through two upper conveyor rollers 21 and then one or two lower conveyor rollers 22.

[0041] It should also be noted that it is preferred that the diameter of all conveyor rollers 2 gradually increases along the belt travel direction of the electrode sheet 4 to be dried. Those skilled in the art may choose to have the diameter of some conveyor rollers 2 gradually increase along the belt travel direction of the electrode sheet 4, depending on the specific circumstances. For example, the diameter of the upper conveyor roller 21 gradually increases along the belt travel direction of the electrode sheet 4, while the diameter of the lower conveyor roller 22 remains the same. Alternatively, the diameter of the lower conveyor roller 22 gradually increases along the belt travel direction of the electrode sheet 4, while the diameter of the upper conveyor roller 21 remains the same. Furthermore, the conveyor rollers 2 located upstream of the electrode sheet 4 in the belt travel direction have the same diameter, while the diameter of the downstream conveyor rollers gradually increases.

[0042] The diameter of the conveyor roller 2 gradually increases by 0.04 mm along the belt direction of the electrode 4 to be dried, which is an example. The value of the gradual increase of the diameter of the conveyor roller 2 along the belt direction of the electrode 4 to be dried is determined according to the amount of growth of the electrode 4 to be dried during the drying process. Specifically, it can be 0.03 mm or 0.05 mm.

[0043] A heating element is disposed inside the conveyor roller 2 and is configured to heat the conveyor roller 2. The heating element is disposed inside the conveyor roller 2 and can heat the conveyor roller 2, which heats the electrode sheet 4 to be dried to the drying temperature for moisture removal.

[0044] It should be noted that the installation of a heating element is not mandatory, and those skilled in the art can choose the specific structure of the heating element based on the specific application scenario. For example, the heating element may consist of a heating element and a fan, with the fan transferring the heat from the heating element to the electrode sheet 4 to be dried. Alternatively, the heating element may include a heater and a heating medium, with a heating cavity inside the conveyor roller 2 for the flow of the heating medium. The heater is located outside the housing 1, and after heating the heating medium, it is conveyed into the heating cavity to heat the conveyor roller 2.

[0045] The drive motor is located on the outside of the housing 1. The drive motor drives the conveyor roller 2 to rotate, enabling the conveyor roller 2 to rotate at the same angular velocity. The drive motor drives the rotation of the conveyor roller 2 through belt drive, chain drive, or gear drive. The specific drive method is existing technology and will not be described in detail here.

[0046] It should be noted that the setting of the drive motor is not necessary. Those skilled in the art can also use other methods to drive the conveyor roller 2 to rotate, such as a pneumatic motor.

[0047] Two guide rollers 3 are disposed inside the housing 1. The two guide rollers 3 are located near the electrode inlet 12 and the electrode outlet 13, respectively. The guide rollers 3 are in contact with the electrode 4 to be dried and are configured to change the conveyor direction of the electrode 4 to be dried. Thus, after the electrode 4 to be dried enters the housing 1, it first passes through the guide rollers 3, allowing the electrode 4 to pass through in a set direction. Before the electrode 4 to be dried exits the housing 1, it finally passes through the other guide roller 3, allowing the electrode 4 to pass through the electrode outlet 13 in a set direction.

[0048] It should be noted that the setting of the guide roller 3 is not mandatory. Technicians in the field can choose whether to set the guide roller 3 based on the specific application scenario. Of course, the guide roller 3 can also be omitted, and when the electrode enters the housing 1, it directly contacts the conveyor roller 2.

[0049] In use, a winding device and an unwinding device are respectively installed outside the electrode inlet 12 and electrode outlet 13 of the housing 1. The electrode 4 to be dried is placed on the unwinding device. After the electrode 4 on the unwinding device is dried by the baking equipment, the winding device winds up the dried electrode. The winding device can also drag the dried electrode to maintain the tension of the electrode itself. The winding device, the unwinding device, and static friction work together, and the diameter of the conveyor roller 2 gradually increases along the belt direction, so that the tension of the electrode 4 to be dried at different positions in the housing 1 gradually increases with the belt direction, avoiding wrinkling and loosening caused by electrode heating and elongation, and reducing the risk of belt abnormalities.

[0050] It should be noted that the specific structures of the unwinding and rewinding devices are existing technologies and will not be described in detail here. The installation of unwinding and rewinding devices is not mandatory; those skilled in the art can choose whether to install them and their specific structures based on the specific application scenario. For example, an unwinding device may be omitted, and the electrode can be directly fed into the baking equipment after production. Similarly, a rewinding device may be omitted, and the electrode can be directly fed into the next process after drying.

[0051] The following describes possible usage methods of the baking equipment during use. Those skilled in the art will understand that the methods described below are merely illustrative and not intended to limit the scope of protection of this application.

[0052] The electrode sheet 4 to be dried is unwound from the unwinding device. It enters the housing 1 through the electrode inlet 12, passes through the guide roller 3, then successively passes the conveyor roller 2, and exits the housing 1 from the electrode outlet 13 after passing another guide roller 3, where it is wound onto the winding device. After entering the housing 1, the electrode sheet 4 expands due to heat. The diameter of the conveyor roller 2 gradually increases along the direction of the electrode sheet 4's movement. Therefore, even if the electrode sheet 4 expands, it can still contact the conveyor roller 2 and maintain tension.

[0053] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0054] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A baking apparatus, characterized in that, Includes the housing, conveyor rollers, and heating elements; The housing is equipped with an electrode inlet and an electrode outlet; Multiple conveyor rollers are provided, and the multiple conveyor rollers are rotatably arranged in the box. The conveyor rollers are configured to convey the electrode sheet to be dried, wherein the diameter of all or part of the conveyor rollers gradually increases along the conveying direction of the electrode sheet to be dried. The heating element is disposed in the housing and is configured to heat the electrode sheet to be dried.

2. The baking equipment according to claim 1, characterized in that, The conveyor rollers include an upper conveyor roller and a lower conveyor roller, which are spaced apart. The electrode sheets to be dried alternately travel on the upper conveyor roller and the lower conveyor roller, thereby forming an S-shaped conveyor.

3. The baking equipment according to claim 2, characterized in that, The upper conveyor roller and the lower conveyor roller are arranged in a manner that allows the electrode sheet to be dried to be conveyed in a vertical direction.

4. The baking equipment according to claim 1, characterized in that, The diameter of all the conveyor rollers gradually increases along the belt direction of the electrode to be dried.

5. The baking equipment according to claim 4, characterized in that, The diameter of the adjacent conveyor roller along the belt direction of the electrode to be dried is increased by any value between 0.03 mm and 0.05 mm.

6. The baking equipment according to claim 1, characterized in that, It also includes a drive motor, which is connected to the conveyor roller in a transmission connection.

7. The baking equipment according to claim 1, characterized in that, Air ducts are provided on the upper and lower sides of the box, and air outlets are provided on the air ducts.

8. The baking apparatus according to claim 7, characterized in that, An upper air vent is provided in the air duct on the upper side of the box, and a lower air vent is provided in the air duct on the lower side of the box. Both the upper air vent and the lower air vent face the electrode sheet to be dried.

9. The baking equipment according to claim 1, characterized in that, The heating element is disposed inside the conveying roller and is configured to heat the conveying roller.

10. The baking apparatus according to claim 1, characterized in that, The baking equipment also includes a steering roller, which is disposed inside the housing and close to the electrode inlet and the electrode outlet, respectively. The steering roller contacts the electrode to be dried and is configured to change the belt direction of the electrode to be dried.

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