A coating oven and a coating oven assembly

Abstract

The utility model relates to the technical field of battery discloses a kind of coating over roller assembly and its coating oven, including main over roller and side over roller, side over roller is located in the one end of main over roller in axial direction, main over roller is coaxially connected with side over roller, side over roller is equipped with temperature-adjusting cavity, liquid inlet and liquid outlet, and liquid inlet and liquid outlet are communicated with temperature-adjusting cavity respectively.The coating over roller assembly and its coating oven of the utility model are connected with temperature-control type over roller on the side of over roller, adjust the temperature of coating over roller side part, avoid the edge curling or crack phenomenon of coating in thinning area.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a coating roller assembly and its coating oven. Background Technology

[0002] Currently, in lithium electrode coating processes, traditional coating ovens generally employ an integrated roller structure, which has significant technical limitations in practical applications. Because the coating thickness in the thinned areas on both sides of the electrode is significantly thinner and directly connected to the uncoated foil areas, a significant temperature difference arises between the thinned areas and the main coating area under uniform heating conditions throughout the oven. This temperature difference leads to various quality problems at the electrode edge: firstly, thermal stress caused by uneven temperature can cause curling and deformation at the electrode edge; secondly, overheating in the thinned areas can easily cause coating cracking, resulting in a persistently high defect rate at the electrode edge. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. It provides a coating roller assembly and its coating oven, wherein a temperature-controlled roller is connected to one side of the roller to adjust the temperature of the side of the coating roller, thereby preventing the coating in the thinned area from curling or cracking.

[0004] To achieve the above objectives, this utility model provides a coating roller assembly, including a main roller and a side roller. The side roller is located at one axial end of the main roller, and the main roller and the side roller are coaxially connected. The side roller is provided with a temperature regulating chamber, a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively connected to the temperature regulating chamber.

[0005] As a preferred embodiment, the main roller includes a main roller body and a main connecting part. The main connecting part is connected to the side of the main roller body facing the side roller. The side roller facing the main roller has a connecting hole, and the main connecting part is inserted into the connecting hole to connect with the side roller.

[0006] As a preferred embodiment, the main connecting part is a screw, the inner peripheral wall of the connecting hole is provided with threads, and the screw is connected to the threads.

[0007] As a preferred embodiment, the temperature regulating cavity is arranged axially around the side roller.

[0008] As a preferred embodiment, the side roller includes a side connecting portion and an outer peripheral portion coaxially arranged. The outer peripheral portion surrounds the outer periphery of the side connecting portion. The temperature regulating cavity is disposed between the outer peripheral portion and the side connecting portion and surrounds the side connecting portion. The connecting hole is opened on the side of the side connecting portion facing the main connecting portion.

[0009] As a preferred embodiment, the liquid inlet and the liquid outlet are located at the two ends of the temperature regulating cavity in the radial direction.

[0010] As a preferred embodiment, the side roller includes a liquid inlet connector, the liquid inlet is located at one end of the side roller opposite to the main connecting part, and the liquid inlet connector is connected to the liquid inlet.

[0011] As a preferred embodiment, the side roller includes a liquid outlet connector, the liquid outlet is located at one end of the side roller opposite to the main connecting part, and the liquid outlet connector is connected to the liquid outlet.

[0012] As a preferred embodiment, the main guide roller is connected to the side guide rollers on both sides of the axial direction.

[0013] A coating oven includes the coating roller assembly, wherein a connecting shaft is connected to one end of the side roller opposite to the main roller, and the connecting shaft is used for rotatable connection with the oven body.

[0014] Compared with existing technologies, the coating roller assembly and coating oven of this utility model have the following advantages: By connecting an independently temperature-controlled side roller to one side of the main roller, zoned temperature control in the coating process is achieved. The main roller and side roller are coaxially connected. The side roller has a built-in temperature-regulating chamber with an inlet and an outlet for connecting to an external temperature-regulating medium circulation system, forming a closed-loop temperature control circuit. Since the coating thinning zone and the empty foil zone are located at the side end of the main coating zone of the electrode sheet, the coating thickness in the coating thinning zone is relatively thin and directly connected to the empty foil zone. Under conventional uniform heating conditions, edge curling and cracking defects are easily generated. The temperature-regulating medium circulation system connected to the inlet and outlet independently controls the temperature of the side roller, creating a reasonable temperature gradient with the main roller, thereby effectively suppressing edge curling caused by temperature difference stress. Simultaneously, the temperature-regulating medium enters the temperature-regulating chamber through the inlet, undergoes heat exchange, and exits through the outlet, achieving temperature regulation and preventing cracking defects in the coating thinning zone due to overheating. The side roller with a temperature-regulating cavity is connected to the main roller, which not only ensures the normal drying requirements of the main coating area of ​​the electrode, but also specifically solves the problem of edge curling or cracking in the coating thinning area, significantly improving the quality stability of the electrode coating. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 This is a schematic diagram of the main roller structure in an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram of the side roller structure of an embodiment of this utility model.

[0018] Figure 4This is a schematic cross-sectional view of the side roller parallel to the axial direction in an embodiment of this utility model.

[0019] Figure 5 This is a schematic cross-sectional view of the side roller in the direction perpendicular to the axis of this utility model embodiment.

[0020] Figure 6 This is a schematic diagram of the connection between the side roller and the connecting shaft in an embodiment of this utility model.

[0021] In the picture: 10. Main guide roller; 11. Main roller body; 12. Main connecting part; 20. Side roller; 21. Temperature regulating chamber; 22. Liquid inlet; 23. Liquid outlet; 24. Connecting hole; 25. Side connecting part; 26. Outer periphery; 27. Liquid inlet connector; 28. Liquid outlet connector; 29. ​​Connecting shaft.

[0022] 30. Electrode main coating area; 31. Coating thinning area; 32. Empty foil area. Detailed Implementation

[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] like Figures 1 to 6As shown, a preferred embodiment of the present invention provides a coating roller assembly, which includes a main roller 10 and a side roller 20. The side roller 20 is located at one axial end of the main roller 10. The main roller 10 and the side roller 20 are coaxially connected. The side roller 20 is provided with a temperature regulating chamber 21, a liquid inlet 22 and a liquid outlet 23. The liquid inlet 22 and the liquid outlet 23 are respectively connected to the temperature regulating chamber 21.

[0027] This invention relates to a coating roller assembly and its coating oven. By connecting an independently temperature-controlled side roller 20 to one side of the main roller 10, it achieves zoned temperature control in the coating process. The main roller 10 and the side roller 20 are coaxially connected. The side roller 20 has a built-in temperature-regulating cavity 21 with an inlet 22 and an outlet 23 for connecting to an external temperature-regulating medium circulation system, forming a closed-loop temperature control circuit. Since the coating thinning zone 31 and the empty foil zone 32 are located at the side end of the main coating zone 30 of the electrode sheet, the coating thickness in the coating thinning zone 31 is relatively thin and directly connected to the empty foil zone 32. Under normal uniform heating conditions, it is prone to edge curling and cracking defects. The temperature-regulating medium circulation system connected by the inlet 22 and outlet 23 independently controls the temperature of the side roller 20, creating a reasonable temperature gradient with the main roller 10, thereby effectively suppressing edge curling caused by temperature difference stress. Simultaneously, the temperature-regulating medium enters the temperature-regulating chamber 21 through the inlet 22, and after heat exchange, it is discharged from the outlet 23, thus achieving temperature regulation and preventing the coating thinning zone 31 from cracking due to overheating. The side roller 20 with the temperature-regulating chamber 21 is connected to the main roller 10, which not only ensures the normal drying requirements of the main coating zone 30 of the electrode, but also specifically solves the problem of edge curling or cracking in the coating thinning zone 31 through the side roller 20 with the temperature-regulating chamber 21, significantly improving the quality stability of the electrode coating.

[0028] Furthermore, such as Figures 1 to 2 As shown, the main roller 10 includes a main roller body 11 and a main connecting part 12. The main connecting part 12 is connected to the side of the main roller body 11 facing the side roller 20. The side roller 20 facing the main roller 10 has a connecting hole 24. The main connecting part 12 is inserted into the connecting hole 24 and connected to the side roller 20. Through the insertion and engagement of the main connecting part 12 of the main roller 10 and the connecting hole 24 of the side roller 20, the main connecting part 12 is inserted into the connecting hole 24 to form a mechanical connection, ensuring that the main roller 10 and the side roller 20 rotate coaxially while establishing thermal isolation. At the same time, the assembly method is simple.

[0029] Furthermore, such as Figures 1 to 2As shown, the main connecting part 12 is a screw, and the inner circumferential wall of the connecting hole 24 is threaded, with the screw connected to the thread. Through the engagement of the screw-type main connecting part 12 and the threaded connecting hole 24, the meshing of the screw and the thread ensures a rigid connection between the main guide roller 10 and the side guide roller 20, improving the connection stability and reliability of the main guide roller 10 and the side guide roller 20. The self-locking characteristic of the threaded connection allows the main guide roller 10 and the side guide roller 20 to maintain a stable connection even during high-speed operation.

[0030] As one embodiment, such as Figures 1 to 2 As shown, the main coating roller 10 and the side coating roller 20 have the same diameter, achieving a smooth transition and uniform stress during the coating process, making the transition between the main coating area 30 and the coating thinning area 31 of the electrode sheet smoother. The equal diameter design ensures uniform pressure distribution between the electrode sheet and the roller surface, avoiding edge stress concentration caused by diameter differences, and effectively preventing wrinkles or deformation of the electrode sheet in the temperature control transition area. This structure, while ensuring the temperature zone control function, further improves the stability of the coating process and the consistency of product quality.

[0031] In one embodiment, the inlet 22 and outlet 23 are respectively connected to a water temperature controller. That is, the external temperature regulating medium circulation system is a water temperature controller. By directly connecting the inlet 22 and outlet 23 to the water temperature controller in the prior art, a complete closed-loop temperature control system is constructed, realizing the automated circulation control of the cooling medium. The water temperature controller can accurately adjust the medium temperature and flow rate, making the temperature control of the side roller 20 more precise and stable.

[0032] In one embodiment, the temperature regulating medium is water.

[0033] Furthermore, such as Figures 3 to 5 As shown, the temperature regulating cavity 21 is arranged axially around the side roller 20 to form an annular cavity. By axially arranging the temperature regulating cavity 21 around the side roller 20, a more efficient temperature control effect is achieved. The annular cavity structure allows the cooling medium to flow uniformly along the circumference of the side roller 20, making the temperature adjustment of the temperature regulating cavity 21 more uniform. The surrounding annular cavity increases the heat exchange area, improves the temperature adjustment response speed, and ensures a uniform temperature field distribution throughout the side roller 20. This makes the temperature control corresponding to the coating thinning zone 31 more precise and stable, effectively solving the problems of electrode edge curling and cracking caused by local temperature differences, and significantly improving the coating quality.

[0034] Furthermore, such as Figures 3 to 5As shown, the side roller 20 includes a coaxially arranged side connecting portion 25 and an outer peripheral portion 26. The outer peripheral portion 26 surrounds the outer periphery of the side connecting portion 25. A temperature regulating cavity 21 is disposed between the outer peripheral portion 26 and the side connecting portion 25 and surrounds the side connecting portion 25. A connecting hole 24 is opened on the side of the side connecting portion 25 facing the main connecting portion 12. The side connecting portion 25 provides space for the connecting hole 24, enabling it to form a stable connection with the screw of the main roller 10, while avoiding structural interference between the connecting hole 24 and the temperature regulating cavity 21. The temperature regulating cavity 21, arranged around the outer periphery of the connecting hole 24, forms an annular heat exchange channel with the connection structure as its core, ensuring both the mechanical strength of the connection and achieving efficient circumferential heat exchange. The coordinated cooperation between the side connecting portion 25 and the outer temperature regulating cavity 21 ensures that the equipment maintains a compact structure while guaranteeing connection stability and temperature control accuracy.

[0035] Furthermore, such as Figure 6 As shown, the inlet 22 and outlet 23 are located at the radial ends of the temperature control cavity 21. By placing the inlet 22 and outlet 23 at the radial ends of the temperature control cavity 21, the flow path of the cooling medium is optimized. The radially opposed layout of the inlet 22 and outlet 23 extends the flow path of the medium within the temperature control cavity 21, thereby improving heat exchange efficiency.

[0036] Furthermore, such as Figure 1 and Figure 6 As shown, the side roller 20 includes a liquid inlet connector 27, and a liquid inlet 22 is located at the end of the side roller 20 opposite to the main connecting part 12. The liquid inlet connector 27 is connected to the liquid inlet 22. Positioning the liquid inlet 22 at the end of the side roller 20 opposite to the main connecting part 12 and configuring the liquid inlet connector 27 further optimizes the piping layout of the cooling system. The location of the liquid inlet connector 27 at the end of the side roller 20 makes it easier to connect to an external temperature control system and facilitates rapid integration into the cooling circulation system.

[0037] In one embodiment, the liquid inlet 22 and the liquid inlet connector 27 are connected by threads.

[0038] Furthermore, such as Figure 1 and Figure 6 As shown, the side roller 20 includes a liquid outlet connector 28, and a liquid outlet 23 is located at the end of the side roller 20 opposite to the main connecting part 12. The liquid outlet connector 28 is connected to the liquid outlet 23. Positioning the liquid outlet 23 at the end of the side roller 20 opposite to the main connecting part 12 and configuring the liquid outlet connector 28 further optimizes the piping layout of the cooling system. The location of the liquid outlet connector 28 at the end of the side roller 20 makes it easier to connect to an external temperature control system and facilitates rapid integration into the cooling circulation system.

[0039] In one embodiment, the liquid outlet 23 and the liquid outlet connector 28 are connected by threads.

[0040] Furthermore, the main roller 10 is connected to the side rollers 20 on both sides of the axial direction. By symmetrically arranging the side rollers 20 on both sides of the main roller 10, synchronous and precise temperature control of the coating thinning zones 31 on both sides of the electrode sheet is achieved. This also solves the problems of edge curling and cracking in the coating thinning zones 31 on both sides, significantly improving the overall quality uniformity of the electrode sheet.

[0041] In one embodiment, the side rollers 20 on both sides are connected to the same temperature control system, ensuring the synchronicity and consistency of temperature response.

[0042] A coating oven includes a coating roller assembly. A connecting shaft 29 is connected to the end of a side roller 20 facing away from the main roller 10. The connecting shaft 29 is rotatably connected to the oven body. The connection between the connecting shaft 29 and the coating oven body achieves integration of the coating roller assembly and the oven body. The connecting shaft 29, located at the end of the side roller 20 facing away from the main roller 10 and rotatably connected to the oven body, ensures stable support for the roller assembly. The rotatable connection structure of the connecting shaft 29 ensures smooth operation of the rollers.

[0043] In summary, this utility model embodiment provides a coating roller assembly and its coating oven. By connecting an independently temperature-controlled side roller 20 to one side of the main roller 10, zoned temperature control in the coating process is achieved. The main roller 10 and the side roller 20 are coaxially connected. The side roller 20 has a built-in temperature-regulating cavity 21 and is equipped with an inlet 22 and an outlet 23 for connecting to an external temperature-regulating medium circulation system, forming a closed-loop temperature control circuit. Since the coating thinning zone 31 and the empty foil zone 32 are located at the side end of the main coating zone 30 of the electrode sheet, the coating thickness in the coating thinning zone 31 is relatively thin and directly connected to the empty foil zone 32. Under normal uniform heating conditions, edge curling and cracking defects are easily generated. Through the temperature-regulating medium circulation system connected by the inlet 22 and the outlet 23, the temperature of the side roller 20 is independently controlled, forming a reasonable temperature gradient with the main roller 10, thereby effectively suppressing edge curling caused by temperature difference stress. Simultaneously, the temperature-regulating medium enters the temperature-regulating chamber 21 through the inlet 22, and after heat exchange, it is discharged from the outlet 23, thus achieving temperature regulation and preventing the coating thinning zone 31 from cracking due to overheating. The side roller 20 with the temperature-regulating chamber 21 is connected to the main roller 10, which not only ensures the normal drying requirements of the main coating zone 30 of the electrode, but also specifically solves the problem of edge curling or cracking in the coating thinning zone 31 through the side roller 20 with the temperature-regulating chamber 21, significantly improving the quality stability of the electrode coating.

[0044] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A coating roller assembly, characterized in that: It includes a main passing roller and a side passing roller. The side passing roller is located at one end of the main passing roller in the axial direction. The main passing roller and the side passing roller are coaxially connected. The side passing roller is provided with a temperature regulating cavity, a liquid inlet and a liquid outlet. The liquid inlet and the liquid outlet are respectively connected to the temperature regulating cavity.

2. The coating roller assembly according to claim 1, characterized in that: The main roller includes a main roller body and a main connecting part. The main connecting part is connected to the side of the main roller body facing the side roller. The side roller facing the main roller has a connecting hole. The main connecting part is inserted into the connecting hole and connected to the side roller.

3. The coating roller assembly according to claim 2, characterized in that: The main connecting part is a screw, and the inner peripheral wall of the connecting hole is threaded, and the screw is connected to the thread.

4. The coating roller assembly according to claim 2, characterized in that: The temperature regulating cavity is arranged axially around the side roller to form an annular cavity.

5. The coating roller assembly according to claim 2, characterized in that: The side roller includes a side connecting part and an outer peripheral part arranged coaxially. The outer peripheral part is arranged around the outer periphery of the side connecting part. The temperature regulating cavity is arranged between the outer peripheral part and the side connecting part and surrounds the side connecting part. The connecting hole is opened on the side of the side connecting part facing the main connecting part.

6. The coating roller assembly according to claim 2, characterized in that: The liquid inlet and the liquid outlet are located at the radial ends of the temperature regulating cavity.

7. The coating roller assembly according to claim 2, characterized in that: The side roller includes a liquid inlet connector, the liquid inlet is located at one end of the side roller away from the main connecting part, and the liquid inlet connector is connected to the liquid inlet.

8. The coating roller assembly according to claim 2, characterized in that: The side roller includes a liquid outlet connector, and the liquid outlet is located at one end of the side roller away from the main connecting part. The liquid outlet connector is connected to the liquid outlet.

9. The coating roller assembly according to claim 1, characterized in that: The main roller is connected to the side rollers on both sides of the axial direction.

10. A coating oven, characterized in that: The coating roller assembly according to any one of claims 1-9 is provided, wherein the end of the side roller opposite to the main roller is connected to a connecting shaft, and the connecting shaft is used for rotatable connection with the housing.

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