Coating apparatus and battery production system

Abstract

The embodiment of the application provides a coating device and a battery production system, and relates to the technical field of batteries. The coating device comprises a coating mechanism, a detection mechanism and a compensation mechanism. The coating mechanism comprises a coating die and a coating roller. The detection mechanism is installed on the coating die and has a first detection piece. The first detection piece is used to obtain round runout data of the coating roller offline. The compensation mechanism is signal-connected with the first detection piece and driving-connected with the coating die. The compensation mechanism is configured to drive the coating die to approach or move away from the coating roller according to the round runout data, so that the distance between the coating die and the coating roller is constant. The application can keep the coating die and the coating roller at a constant distance, thereby improving the uniformity of the coating thickness of the coating device and ultimately improving the consistency and yield of the coating process.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a coating apparatus and a battery production system. Background Technology

[0002] In the production process of battery devices, electrode coating is required. For example, a slurry is applied to the surface of a substrate on a rotating coating roller through a coating die to form an active material layer of a specific thickness on the substrate surface.

[0003] Uneven thickness of the slurry coated on the substrate can negatively affect the electrochemical performance of the electrode. Therefore, improving the uniformity of coating thickness in coating equipment is a research direction in battery technology. Utility Model Content

[0004] This application provides a coating apparatus and a battery production system, which can improve the uniformity of coating thickness of the coating apparatus.

[0005] In a first aspect, embodiments of this application provide a coating apparatus, including a coating mechanism, a detection mechanism, and a compensation mechanism. The coating mechanism includes a coating die and a coating roller, wherein the coating die and the coating roller are disposed opposite to each other and have an interval. The coating roller is used to drive a substrate to move, and the coating die is used to coat the substrate that has moved to the interval with a slurry. The detection mechanism is installed on the coating die and has a first detection element. The first detection element is used to acquire the circular runout data of the coating roller offline. The first detection element has a first state and a second state. In the first state, the first detection element is located within the interval, and in the second state, the first detection element is located outside the interval. The compensation mechanism is signal-connected to the first detection element and drively connected to the coating die. The compensation mechanism is configured to drive the coating die to move towards or away from the coating roller according to the circular runout data, so that the distance between the coating die and the coating roller remains constant.

[0006] By adopting the above technical solution, the coating device is designed to include a coating mechanism, a detection mechanism, and a compensation mechanism. Since the first detection element is removed to the area outside the space between the coating die and the coating roller, the circular runout data of the coating roller can be detected using the first detection element when the coating device is offline. During coating, the first detection element is removed to the area outside the space between the coating die and the coating roller. Since the first detection element is located between the coating die and the coating roller during detection, it can more accurately reflect the circular runout of the coating roller and the change in the distance between the coating die and the coating roller. This provides more accurate data support for the compensation mechanism, enabling the compensation mechanism to move the coating die to compensate for the change in the distance between the coating roller and the coating die during coating. The coating die and the coating roller are at a constant distance, thereby improving the uniformity of the coating thickness of the coating device and ultimately improving the consistency and yield of the coating process.

[0007] In some embodiments of this application, the detection mechanism is detachably mounted on the coating die head so that the first detection element can be removed to an area outside the interval.

[0008] By adopting the above technical solution, the detection mechanism can be detachably installed on the coating die head, which not only enables the first detection piece to be removed to the area outside the coating die head and the coating roller, but also facilitates the disassembly and assembly of the detection mechanism.

[0009] In some embodiments of this application, the testing mechanism includes a mounting component and a connector. The mounting component is detachably mounted to the coating die head, one end of the connector is mounted to the mounting component, and the first testing component is mounted to the other end of the connector.

[0010] The above technical solution is adopted to design the testing mechanism to include a mounting component and a connector. The mounting component facilitates the docking of the testing mechanism with the coating die head, and the connector not only facilitates the connection between the testing component and the mounting component, but also allows the testing component to be extended and placed between the coating die head and the coating roller.

[0011] In some embodiments of this application, the connector is an adjustable structure capable of adjusting the position of the first detection element.

[0012] By adopting the above technical solution, the connector is configured to adjust the position of the first detection element, which can be adjusted to the optimal detection position and improve detection accuracy.

[0013] In some embodiments of this application, the connector is a deformable component.

[0014] By adopting the above technical solution, the connector is designed as a deformable part, and the position of the first detection part is adjusted by the deformation of the connector. The structure is simple and easy to adjust.

[0015] In some embodiments of this application, the mounting component is magnetically connected to the coating die head, or the mounting component is detachably connected to the coating die head via a detachable component.

[0016] The above technical solution utilizes magnetic or detachable connectors to connect the mounting parts and the coating die head, making the connection simple and easy to assemble and disassemble.

[0017] In some embodiments of this application, the detection mechanism includes a mounting component and a connector. The mounting component is mounted on the coating die head, one end of the connector is mounted on the mounting component, and the first detection component is mounted on the other end of the connector. The connector is a deformable component, and the deformation of the connector is used to move the first detection component to an area outside the space between the coating die head and the coating roller.

[0018] The above technical solution utilizes the deformation of the connector to move the first detection component to the area outside the coating die head and coating roller. The structure is simple, easy to implement, and does not require disassembling the entire detection mechanism.

[0019] In some embodiments of this application, the first detection element includes a laser sensor.

[0020] By adopting the above technical solution, the first detection component is designed to include a laser sensor, which is used to measure the circular runout data of the coating roller, resulting in high detection accuracy.

[0021] In some embodiments of this application, the detection mechanism further includes an adjustment member connected to the laser sensor and used to adjust the horizontality and parallelism of the laser sensor's spot.

[0022] By using the above technical solution, the horizontality and parallelism of the laser sensor spot can be adjusted by adjusting the adjustment component, so that the spot is aligned with the generatrix of the coating roller, thereby improving the detection accuracy and data reliability.

[0023] In some embodiments of this application, the compensation mechanism includes a data processing module and a drive module. The data processing module is connected to the first detection element and the drive module respectively. The data processing module is used to match the circular runout data with the action of the drive module to generate compensation data. The drive module is connected to the coating die head for transmission and drives the coating die head to move closer to or away from the coating roller according to the compensation data.

[0024] By adopting the above technical solution, the circular runout data is processed and analyzed by the data processing module to guide the action of the drive module. This can reduce malfunctions caused by laser sensor signal fluctuations, reduce dependence on raw sensor data, improve anti-interference ability, enhance system stability, achieve dynamic adaptive adjustment, more accurately offset the circular runout error of the coating roller at different speeds, and further improve the uniformity of coating thickness.

[0025] In some embodiments of this application, the drive module includes a drive member and a transmission assembly connected by transmission. The transmission assembly is connected to the coating die head and is used to convert the rotary motion of the drive member into linear motion, so as to drive the coating die head to move towards or away from the coating roller.

[0026] By adopting the above technical solution, a linear drive method using a motor and transmission components can achieve high-precision displacement control and rapid dynamic response, directly and effectively adjusting the position of the coating die head. Moreover, the transmission is smooth and reliable, without the lag problems found in pneumatic or hydraulic systems.

[0027] In some embodiments of this application, the drive module further includes a second detection element, which is mounted on the drive element and used to detect the rotation angle of the motor shaft of the drive element, and the data processing module is connected to the second detection element.

[0028] By adopting the above technical solution, the rotation angle of the motor shaft is fed back in real time through the second detection element, so that the data processing module forms a closed-loop control. This allows the motor execution accuracy to be strictly matched with the compensation command, eliminating transmission errors. Moreover, the position deviation is corrected in real time through angle feedback, improving the positioning accuracy of the coating die head.

[0029] In some embodiments of this application, the second detection element includes an encoder.

[0030] By adopting the above technical solution, the second detection component is designed to include an encoder. The encoder can perform high-resolution angle feedback to achieve precise closed-loop control of the motor rotation angle and reduce the accumulation of transmission errors. The digital signal output of the encoder can directly and efficiently interact with the data processing module to improve the system response speed. At the same time, the encoder can still detect stably under complex working conditions, making the dynamic adjustment of the coating die head more accurate and reliable, and significantly improving the uniformity of coating thickness and process consistency.

[0031] In some embodiments of this application, the coating die head has a discharge port, and the first detection element in the first state is located between the discharge port and the coating roller.

[0032] By adopting the above technical solution, the first detection component is set between the discharge port and the coating roller, which can directly detect the real-time fluctuation data of the coating roller and eliminate the transmission error caused by traditional indirect measurement. The close arrangement of the first detection component with the coating roller and coating die head can minimize environmental interference and improve the authenticity of the detection signal. At the same time, the measured data has a direct correspondence with the change of coating gap, making the compensation command generated by the data processing module more accurate, and finally realizing dynamic and precise control of coating thickness, significantly improving the uniformity of coating thickness.

[0033] Secondly, embodiments of this application provide a battery production system, including a coating apparatus as described in any of the above technical solutions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0035] Figure 1 This is a partial structural schematic diagram of a coating apparatus provided in some embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the coating die head and coating roller of a coating apparatus provided in some embodiments of this application.

[0037] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0038] 100. Coating apparatus;

[0039] 10. Coating mechanism; 11. Coating die; 111. Discharge port; 12. Coating roller; 13. First baseline; 14. Second baseline;

[0040] 20. Testing organization; 21. First test piece; 22. Mounting component; 23. Connecting component; 24. Adjusting component;

[0041] 30. Compensation mechanism; 31. Data processing module; 32. Drive module; 321. Drive component; 322. Transmission assembly;

[0042] 200. Substrate. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "including," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0049] In this application, "multiple" means two or more (including two).

[0050] The embodiments of this application will now be described in detail.

[0051] In battery manufacturing, coating equipment is used to uniformly coat the substrate surface with slurry to form an active material layer. The coating quality directly affects the electrochemical performance and consistency of the battery. Coating equipment typically uses a combination of coating rollers and coating dies to control slurry transfer. The rotation of the coating rollers drives the substrate movement, while the coating die adjusts the slurry coating thickness. Therefore, the stability of the distance between the coating rollers and the coating die is crucial.

[0052] However, the coating roller is prone to circular runout when rotating at high speed, which causes dynamic changes in the distance between it and the coating die, thus affecting the uniformity of the slurry coating thickness. If the circular runout problem is not effectively compensated, it will cause fluctuations in coating thickness, and may even lead to problems such as uneven thickness and surface defects in the battery electrodes, reducing battery performance and production yield.

[0053] While existing technologies can detect the circular runout of coating rollers online, the structural layout of the coating die limits the ability of sensors to be directly installed in the critical detection area between the coating die and the coating roller. This results in discrepancies between the detected data and the actual operating conditions, affecting measurement accuracy. Furthermore, existing compensation systems require data processing after detecting circular runout before driving the coating die to adjust, resulting in a certain response lag. This makes it difficult to promptly compensate for dynamic runout errors during high-speed coating, ultimately affecting coating uniformity.

[0054] Therefore, improving the uniformity of coating thickness in coating equipment is an important issue in battery production and processing.

[0055] In view of this, this application provides a technical solution that uses a detachable detection mechanism to detect the circular runout data of the coating roller facing the coating die head offline, and then uses a compensation mechanism to perform online displacement compensation of the coating die head based on the detected circular runout data, thereby solving the above-mentioned technical problem.

[0056] The following is in conjunction with the appendix Figure 1 and 2 The coating apparatus 100 provided in the embodiments of this application will be described.

[0057] Combined with appendix Figure 1As shown in the figure, this application embodiment provides a coating apparatus 100, including a coating mechanism 10, a detection mechanism 20, and a compensation mechanism 30. The coating mechanism 10 includes a coating die 11 and a coating roller 12, which are arranged opposite to each other and have a gap. The coating roller 12 is used to drive the substrate 200 to move towards the coating die 11, and the coating die 11 is used to coat the substrate 200 that has moved to the gap with a slurry. The detection mechanism 20 is installed on the coating die 11 and has a first detection element 21. The first detection element 21 is used to acquire the circular runout data of the coating roller 12 offline. It has a first state and a second state. In the first state, the first detection element 21 is located within the interval. In the second state, the first detection element 21 is located outside the interval. The compensation mechanism 30 is signal-connected to the first detection element 21 and drive-connected to the coating die head 11. The compensation mechanism 30 is configured to drive the coating die head 11 to move closer to or further away from the coating roller 12 according to the circular runout data, so that the distance between the coating die head 11 and the coating roller 12 is constant.

[0058] The coating die 11 in this embodiment is used to uniformly coat the slurry onto the surface of the substrate 200. It includes a discharge chamber (not shown in the figure) and a discharge port 111. The coating thickness can be controlled by adjusting the slit width or pressure of the discharge port 111.

[0059] In this embodiment, the coating roller 12 supports the substrate 200 and works with the coating die 11 to complete the coating process. The coating roller 12 drives the substrate 200 to move by rotating through a drive structure (not shown in the figure). The coating die 11 and the coating roller 12 are arranged opposite to each other and form the aforementioned interval, which refers to the space between the coating die 11 and the coating roller 12.

[0060] The first detection element 21 is configured to switch between a first state and a second state. In the first state, the first detection element is located within the interval between the coating die 11 and the coating roller 12. In the second state, the first detection element is removed to the area outside the interval between the coating die 11 and the coating roller 12. When performing offline detection, the first detection element 21 is in the first state. When performing online coating, the first detection element 21 is removed to the second state so as not to affect the coating operation of the coating roller 12 and the coating die 11.

[0061] The above structure allows the first detection element 21 of this embodiment to be located between the coating die 11 and the coating roller 12 during detection. Compared with the related technology, which cannot install the detection element between the coating die 11 and the coating roller 12 when online detection of the circular runout data of the coating roller 12 is not possible, and can only set the detection element diagonally above or below the coating roller 12, this embodiment designs the first detection element 21 to obtain the circular runout data of the coating roller 12 between the coating die 11 and the coating roller 12.

[0062] This allows the first detection element 21 to be positioned closer to the critical mating area between the coating roller 12 and the coating die 11, directly reflecting the actual dynamic deviation of the coating roller 12 during the coating process, thereby improving the accuracy and representativeness of the detection data. Moreover, since the gap between the coating die 11 and the coating roller 12 directly affects the coating uniformity, detecting circular runout here can provide real-time feedback on the dynamic changes of the coating roller 12, facilitating timely adjustment of the roller position or compensation for runout errors, thereby reducing coating thickness fluctuations and improving coating quality.

[0063] The circular runout data of the coating roller 12 in this embodiment refers to the radial deviation of the coating roller 12 from the ideal circumferential motion during rotation, which is used to characterize the degree of dynamic eccentricity or deformation of the roller. The circular runout data can be obtained by real-time detection of the radial distance change between the surface of the coating roller 12 and the reference position by a displacement sensor, and is presented in the form of maximum runout or runout curve. Excessive circular runout will cause fluctuations in the gap between the coating roller 12 and the die, which will lead to problems such as uneven coating thickness, streaks, or edge defects. Circular runout data is particularly critical in high-speed coating processes because it directly affects coating accuracy and consistency. For example, in lithium battery electrode coating, micron-level runout can cause differences in the distribution of active materials, affecting battery performance. Therefore, this embodiment optimizes the detection position of the first detection element 21 to more accurately capture the dynamic runout characteristics of the coating roller 12 in the critical working area (between the die and the roller), providing data support for real-time compensation control, thereby improving coating quality.

[0064] In this embodiment, the compensation mechanism 30 is used to dynamically adjust the position of the coating die head 11 based on the circular runout data of the coating roller 12 fed back by the first detection element 21. Specifically, the compensation mechanism 30 pre-compensates the position of the coating die head 11 based on the circular runout data of the coating roller 12 obtained in the offline state when the coating device 100 is running.

[0065] This design leverages the consistent circular runout characteristics (such as eccentricity and runout period) of the coating roller 12 in both offline and online states. The compensation mechanism 30 synchronously drives the coating die head 11 to make periodic displacement adjustments based on pre-stored circular runout data, ensuring that the gap between the die head and the coating roller 12 remains at a set value. This technical solution eliminates the need for real-time online detection. By pre-matching the rotation phase of the coating roller 12 with the compensation action, the gap fluctuations caused by circular runout can be offset. This simplifies the control system structure and avoids signal interference that might be introduced by online detection, making it particularly suitable for high-speed coating scenarios.

[0066] In addition to the coating mechanism 10, the detection mechanism 20, and the compensation mechanism 30 described above, the coating apparatus 100 also includes a drying device (for hot air or infrared heating to cure the coating), a tension control device (for adjusting the tension of the substrate 200), a deviation correction device (for keeping the substrate 200 aligned), and a winding and unwinding device (for conveying and winding the substrate 200). This embodiment will not describe these in detail.

[0067] As explained above, since the first detection element 21 is removed to the area outside the space between the coating die 11 and the coating roller 12, the circular runout data of the coating roller 12 can be detected using the first detection element 21 when the coating device 100 is offline. Because the first detection element 21 is located between the coating die 11 and the coating roller 12 during detection, it can more accurately reflect the change in the distance between the circular runout of the coating roller 12 and the coating die 11, thereby providing more accurate data support for the compensation mechanism 30. This allows the compensation mechanism 30 to move the coating die 11 during coating in the coating device 100 to compensate for the change in the distance between the coating roller 12 and the coating die 11 caused by the circular runout. The coating die 11 and the coating roller 12 are at a constant distance, thereby improving the uniformity of the coating thickness of the coating device 100 and ultimately improving the consistency and yield of the coating process.

[0068] In some examples, the detection mechanism 20 is optionally detachably mounted to the coating die head 11 so that the first detection element 21 can be removed to an area outside the interval.

[0069] The area outside the space between the coating die 11 and the coating roller 12 refers to any position other than between the coating die 11 and the coating roller 12. For example, it can be located on one side of the coating die 11 and / or the coating roller 12 along a preset direction, which is perpendicular to the arrangement direction of the coating die 11 and the coating roller 12, or it can be the area away from the coating die 11 and the coating roller 12.

[0070] In this embodiment, the detection mechanism 20 is detachably installed on the coating die head 11. When performing offline detection, the detection mechanism 20 is located on the coating die head 11 and obtains the circular runout data of the coating roller 12 through the first detection element 21. When coating is required, the detection mechanism 20 can be directly removed.

[0071] The detection mechanism 20 is detachably installed on the coating die head 11, which not only enables the first detection piece 21 to be removed to the area outside the interval, but also facilitates the disassembly and assembly of the detection mechanism 20.

[0072] In some examples, the detection mechanism 20 may optionally include a mounting member 22 and a connector 23, the mounting member 22 being detachably mounted to the coating die head 11, one end of the connector 23 being mounted to the mounting member 22, and the first detection member 21 being mounted to the other end of the connector 23.

[0073] In this embodiment, the mounting component 22 serves as the connection base between the detection mechanism 20 and the coating die head 11. It adopts a detachable design (such as bolt fixing, snap-fit, or magnetic structure) to facilitate quick installation or removal from the coating die head 11. The main function of the mounting component 22 is to provide a stable mechanical interface, enabling the detection mechanism 20 to maintain a fixed relative position with the coating die head 11 during offline measurement, while reducing interference with the original structure of the die head.

[0074] In this embodiment, the connector 23 serves as an intermediate carrier between the mounting component 22 and the first detection component 21. One end of the connector is fixed to the mounting component 22, and the other end extends to the detection area between the coating die head 11 and the coating roller 12.

[0075] This embodiment employs a modular combination of mounting components 22 and connectors 23, which facilitates the rapid deployment and precise positioning of the detection mechanism 20, making it particularly suitable for offline measurement scenarios. The detachable structure facilitates the maintenance or replacement of the detection device while reducing interference with the process during online coating; the extended connector 23 allows the first detection component 21 to penetrate deep into the narrow space between the die head and the coating roller 12, directly measuring the dynamic fluctuation data of the coating roller 12 and improving measurement reliability.

[0076] In some examples, the connector 23 may optionally be an adjustable structure capable of adjusting the position of the first detection element 21.

[0077] In this embodiment, the connector 23 is designed as an adjustable structure, which allows for flexible adjustment of the position of the first detection element 21. This adjustment function allows the operator to precisely move the first detection element 21 to a suitable measurement point close to the surface of the coating roller 12 according to the actual size of the coating roller 12, the die installation position, and the detection requirements.

[0078] The aforementioned "adjusting the position of the first detection element 21" may include adjusting the horizontal and vertical height and detection angle of the first detection element 21 to adapt to the detection requirements of coating rollers 12 of different specifications, so that the first detection element 21 can accurately obtain circular runout data.

[0079] In some embodiments, the connector 23 may be an adjustable length rod-shaped or arm-shaped structure (e.g., a telescopic rod, a hinged arm, a damping hinge, or a deformable component described below). The connector 23 can flexibly adjust the spatial position of the first detection element 21 so that it is more accurately aligned with the surface of the coating roller 12, thereby obtaining effective circular runout data.

[0080] The adjustable capability of connector 23 reduces measurement errors caused by installation position deviations in the first detection element 21. Simultaneously, this design enhances the versatility of the detection mechanism 20, making it applicable to more types of coating equipment and reducing equipment modification costs. It also facilitates the maintenance and calibration of the detection mechanism 20, improving its practicality.

[0081] In some embodiments of this application, the connector 23 is a deformable component.

[0082] The connector 23 is a deformable component, meaning it is made of a deformable material (such as a metal spring, flexible connecting rod, or shape memory alloy) and can undergo controllable elastic deformation under external force. This allows the position of the first detection component 21 to be adjusted manually or by applying force with tools, and it can maintain a relatively stable shape after deformation. The deformable component has sufficient rigidity to maintain the detection position, and can also adapt to different detection angle requirements through moderate bending, providing a more flexible positioning method for the detection mechanism 20.

[0083] The stepless adjustment of the first detection element 21, achieved through a deformable component, allows for more precise conformation of the coating roller 12's surface contour, improving the quality of circular runout data acquisition. Compared to the rigid connector 23, the deformable structure is more adaptable to installation requirements in confined spaces, reducing the risk of interference with the coating die 11's structure. Its simple mechanical structure also reduces the complexity of the adjustment mechanism, improving the reliability and economy of the detection device.

[0084] In addition, the first detection element 21 can be moved to a position that does not affect the coating roller 12 and coating die head 11 during coating by deforming the connector 23, as described below. In this case, it is not necessary to remove the mounting part 22.

[0085] Of course, the structural form of the connector 23 in this embodiment is not limited to a deformable part. For example, the connector 23 can also be a telescopic part, a rotating joint part, or a slide rail mechanism, etc. This embodiment will not list them one by one.

[0086] In some examples, the mounting element 22 is optionally magnetically connected to the coating die 11, or the mounting element 22 is detachably connected to the coating die 11 via a detachable part (not shown).

[0087] Magnetic connection refers to setting a permanent magnet or electromagnet on the mounting part 22 so that it can be attracted and fixed to the metal part of the coating die head 11.

[0088] The magnetic connection allows for quick assembly and disassembly, facilitating repeated installation and position adjustment of the testing mechanism 20, while reducing mechanical damage to the coating die head 11 structure.

[0089] The detachable parts can be components such as clips or bolts. When using mechanically detachable parts such as bolts or clips for connection, the mounting part 22 is fixed to the coating die head 11 by threaded fastening or snap-fit ​​structure. Detachable parts connection has high structural stability, can withstand greater vibration, is suitable for high-precision testing requirements, and does not require special tools for disassembly and assembly, making maintenance relatively convenient.

[0090] Of course, in addition to the detachable parts mentioned above, detachable parts can also be quick-release pins, spring clips, or Velcro, etc., which will not be listed one by one in this embodiment.

[0091] In some examples, the detection mechanism 20 may optionally include a mounting member 22 and a connector 23. The mounting member 22 is mounted on the coating die head 11, one end of the connector 23 is mounted on the mounting member 22, and the first detection member 21 is mounted on the other end of the connector 23. The connector 23 is a deformable member, and the deformation of the connector 23 is used to drive the first detection member 21 to be removed to an area outside the interval.

[0092] In addition to the above-described method of removing the first detection element 21 to the area outside the space between the coating die head 11 and the coating roller 12, the method of removing the first detection element 21 can also be that the mounting element 22 is removably mounted on the coating die head 11, or the connector 23 is designed to have a deformable structure.

[0093] The deformable structure and optional materials of connector 23 have been given above, and will not be repeated in this embodiment.

[0094] By deforming the connector 23, this embodiment provides another way to move the first detection element 21 to the area outside the space between the coating die head 11 and the coating roller 12. The structure is simple, easy to implement, and does not require disassembling the entire detection mechanism 20.

[0095] In some examples, the first detection element 21 may optionally include a laser sensor.

[0096] The laser sensor emits a laser beam onto the surface of the coating roller 12 and receives the reflected signal, measuring the change in radial distance between the coating roller 12 surface and the sensor in real time, thereby obtaining the circular runout data during the rotation of the coating roller 12. The non-contact measurement method of the laser sensor can effectively reduce wear or interference to the roller surface.

[0097] Laser sensors have advantages such as high resolution, high response speed, and strong anti-interference ability. They can achieve micron-level precision measurement, adapt to vibration and temperature fluctuations in industrial environments, and have flexible installation positions, making them easy to integrate into the detection mechanism 20.

[0098] In addition to laser sensors, eddy current sensors, capacitive displacement sensors or contact probes can also be used as the first detection element 21. This embodiment will not list them all.

[0099] In some examples, the detection mechanism 20 may optionally include an adjustment element 24 connected to the laser sensor and used to adjust the horizontality and parallelism of the laser sensor's spot.

[0100] The adjustment component 24 can adopt a structure of precision knob in conjunction with universal joint or tilting platform, and change the pitch angle and deflection angle of the laser sensor through a fine adjustment mechanism.

[0101] The adjusting component 24 can precisely control the projection direction of the laser spot, so that it maintains good parallelism and horizontality with the generatrix of the coating roller 12, providing an alignment reference for accurately measuring the circular runout data of the coating roller 12.

[0102] With the addition of the adjustment component 24, the measuring spot of the laser sensor can be more accurately aligned with the characteristic position of the coating roller 12, which helps to reduce measurement errors caused by installation deviations. This allows the laser sensor to adapt to the detection requirements of coating rollers 12 with different diameters, improving the adaptability of the detection system and the reliability of the measurement data.

[0103] In some examples, the compensation mechanism 30 may optionally include a data processing module 31 and a drive module 32. The data processing module 31 is connected to the first detection element 21 and the drive module 32 respectively. The data processing module 31 is used to match the circular runout data with the action of the drive module 32 to generate compensation data. The drive module 32 is connected to the coating die head 11 and drives the coating die head 11 to move closer to or away from the coating roller 12 according to the compensation data.

[0104] The data processing module 31 can be integrated into the control system of the coating apparatus 100. In some embodiments, the data processing module 31 may include a signal conversion unit, a data storage unit, and a motion control unit (not shown in the figure). The signal conversion unit is used to convert the analog signal collected by the first detection element 21 into a digital signal and perform preliminary filtering processing. The data storage unit is used to store the circular runout characteristic data of the coating roller 12 and the corresponding phase information. The motion control unit generates displacement commands for the drive module 32 based on the processed data to realize the synchronous compensation motion of the coating die head 11.

[0105] The data processing module 31 can be connected to the first detection element 21 and the drive module 32 through a communication interface (such as CAN bus or Ethernet), and uses a PLC or motion controller as the core processing unit to realize real-time data reception and command issuance.

[0106] The data processing module 31 receives the raw circular runout data collected by the first detection element 21, and after filtering and phase analysis, establishes the correspondence between the rotation angle of the coating roller 12 and the radial runout. Then, it generates a position compensation command according to a preset algorithm, and converts the compensation data into a displacement control signal for the drive module 32 to realize the synchronous position adjustment of the coating die head 11.

[0107] The data processing module 31 processes and analyzes the circular runout data to guide the action of the drive module 32. This reduces malfunctions caused by fluctuations in the laser sensor signal, lowers the dependence on the original sensor data, improves anti-interference ability, enhances system stability, achieves dynamic adaptive adjustment, and more accurately offsets the circular runout error of the coating roller 12 at different speeds, further improving the uniformity of the coating thickness.

[0108] In some examples, the drive module 32 may optionally include a drive member 321 and a transmission assembly 322 connected by a transmission link. The transmission assembly 322 is connected to the coating die head 11 and is used to convert the rotary motion of the drive member 321 into linear motion to drive the coating die head 11 to move toward or away from the coating roller 12.

[0109] The driving component 321 in this embodiment can be a motor, and the transmission component 322 in this embodiment can include structures such as ball screws, gear racks, crank sliders, etc. Of course, it can also be other structures that can convert rotary motion into linear motion, which will not be listed one by one in this embodiment.

[0110] The linear drive method using the drive component 321 and the transmission component 322 enables high-precision displacement control and rapid dynamic response, directly and effectively adjusting the position of the coating die head 11. Moreover, the transmission is smooth and reliable, without the lag problems found in pneumatic or hydraulic systems.

[0111] Combined with appendix Figure 2As shown (the dashed line on the coating die 11 represents the compensated coating die 11, and the dashed line on the coating roller 12 represents the coating roller 12 after circular runout), when the drive module 32 of this embodiment includes the drive component 321 with transmission connection, the data processing module 31 realizes circular runout compensation control through the following steps: First, in the offline (shutdown) state of the coating device 100, the complete circular runout data of the coating roller 12 is collected offline by the first detection component 21, and the radial circular runout amount (Δα) of the coating roller 12 at different rotation angles is recorded to form a circular runout fluctuation curve; then, the data processing module 31 The collected circular runout data is correlated with the rotation phase of the coating roller 12 drive mechanism to generate a die head displacement compensation curve. The compensation amount (-Δα) is equal in magnitude and opposite in direction to the circular runout amount, so that the peaks and troughs of the circular runout fluctuation curve and the die head displacement compensation curve add up to zero. Finally, when the coating device 100 is running, the drive module 32 adjusts the die head position synchronously with the real-time rotation phase of the coating roller 12 according to the pre-stored compensation curve, so that the die head compensation displacement and the circular runout of the coating roller 12 form an opposite superposition, thereby eliminating the influence of circular runout on the gap between the die head and the coating roller 12.

[0112] In some examples, the drive module 32 may optionally include a second detection element (not shown in the figure), which is mounted on the drive unit 321 and used to detect the rotation angle of the motor shaft of the drive unit 321, and the data processing module 31 is connected to the second detection element.

[0113] The data processing module 31 can be connected to the second detection element, the first detection element 21, and the drive module 32 via communication. "Communication connection" refers to the way in which the two interact with each other via wireless signals (Bluetooth, Wi-Fi, CAN bus, etc.) or wired connections.

[0114] The second detection element can be installed on the motor shaft of the drive unit 321 to monitor the angular displacement of the motor rotor in real time. The detection data of the second detection element is transmitted to the data processing module 31. The data processing module 31 compares the actual rotation angle with the theoretical value of the compensation command, and dynamically adjusts the output through control algorithms such as PID to form a position closed-loop control.

[0115] The second detection element provides real-time feedback on the motor shaft angle information. The data processing module 31 can dynamically compare the deviation between the actual displacement and the compensation command, and output a correction signal.

[0116] The aforementioned closed-loop control mechanism can actively compensate for mechanical errors in the transmission system (such as lead screw backlash and gear meshing clearance), effectively suppressing positioning deviations caused by wear of transmission components 322 or assembly tolerances. Under high-speed coating conditions, the data processing module 31 significantly reduces dynamic following errors caused by changes in inertial load by adjusting the motor torque output in real time, ensuring that the displacement of the coating die 11 remains synchronized with the pre-stored compensation curve. While retaining the high efficiency of offline detection, online closed-loop correction further improves compensation accuracy, enabling higher stability in the gap control between the coating die 11 and the coating roller 12.

[0117] In some examples, the second detection element includes an encoder.

[0118] An encoder is a precision sensor that converts mechanical motion parameters into electrical signals. By designing the second detection element to include the encoder, the encoder can provide high-resolution angle feedback to achieve precise closed-loop control of the motor rotation angle and reduce the accumulation of transmission errors.

[0119] In addition, the encoder's digital signal output can directly and efficiently interact with the data processing module 31, improving the system response speed. At the same time, the encoder can still detect stably under complex working conditions, making the dynamic adjustment of the coating die 11 more accurate and reliable, and significantly improving the uniformity of coating thickness and process consistency.

[0120] In some examples, the coating die 11 optionally has an outlet 111, with the first detection element 21 located between the outlet 111 and the coating roller 12 in the first state.

[0121] The first detection element 21 is positioned in a critical area between the discharge port 111 and the coating roller 12. This allows the first detection element 21 to be positioned closer to or directly on the first baseline 13 of the coating die 11 and the second baseline 14 of the coating roller 12 (for ease of understanding, the first baseline 13 and the second baseline 14 are shown as dashed lines in this embodiment). This enables the first detection element 21 to directly monitor the relative positional changes between the two baselines. In some embodiments, the first baseline 13 and the second baseline 14 coincide. This arrangement allows the detection data to more accurately reflect the dynamic fluctuations of the actual coating gap, providing a more comprehensive benchmark for gap compensation.

[0122] The first baseline 13 mentioned above refers to the linear reference formed by the lower edge of the discharge port 111, and its flatness directly affects the slurry extrusion morphology. The second baseline 14 mentioned above is the contact generatrix between the surface of the coating roller 12 and the lip, and its circular runout will cause periodic changes in the gap. The coating slit formed by the two generatrixes is the core area that determines the uniformity of the coating, and the measurement of the test piece at this position can most directly reflect the actual process state.

[0123] In addition, this application embodiment also provides a battery production system, including a coating device 100 as described in any of the above technical solutions. In addition to the coating device 100, the battery production system may also include a slurry mixing device, a rolling device, an electrode slitting device, etc., which will not be listed in detail in this embodiment.

[0124] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0125] Combined with appendix Figure 1 and attached Figure 2As shown in the figure, this application embodiment provides a coating apparatus 100, including a coating mechanism 10, a detection mechanism 20, and a compensation mechanism 30. The coating mechanism 10 includes a coating die 11 and a coating roller 12, which are arranged opposite to each other and have a gap. The coating roller 12 is used to drive the substrate 200 to move towards the coating die 11, and the coating die 11 is used to coat the substrate 200 that has moved to the gap with a slurry. The detection mechanism 20 is installed on the coating die 11 and has a first detection element 21. For offline acquisition of circular runout data of coating roller 12, the first detection element 21 has a first state and a second state. In the first state, the first detection element 21 is located within the interval, and in the second state, the first detection element 21 is located outside the interval. A compensation mechanism 30 is signal-connected to the first detection element 21 and drive-connected to the coating die head 11. The compensation mechanism 30 is configured to move the coating die head 11 towards or away from the coating roller 12 based on the circular runout data, so that the distance between the coating die head 11 and the coating roller 12 remains constant. The detection mechanism 20 is detachably mounted on the coating die head 11 so that the first detection element 21 can be removed to an area outside the interval. The detection mechanism 20 includes a mounting member 22 and a connecting member 23. The mounting member 22 is detachably mounted on the coating die head 11, one end of the connecting member 23 is mounted on the mounting member 22, and the first detection element 21 is mounted on the other end of the connecting member 23. The connecting member 23 is an adjustable structure capable of adjusting the position of the first detection element 21. The connecting member 23 is a deformable component. The mounting component 22 is magnetically connected to the coating die head 11, or the mounting component 22 is detachably connected to the coating die head 11 via a detachable component. The detection mechanism 20 includes the mounting component 22 and the connecting component 23. The mounting component 22 is mounted on the coating die head 11, one end of the connecting component 23 is mounted on the mounting component 22, and the first detection component 21 is mounted on the other end of the connecting component 23. The connecting component 23 is a deformable component, and the deformation of the connecting component 23 is used to remove the first detection component 21 to an area outside the interval. The first detection component 21 includes a laser sensor. The detection mechanism 20 also includes an adjusting component 24, which is connected to the laser sensor and is used to adjust the horizontality and parallelism of the laser sensor's spot. The compensation mechanism 30 includes a data processing module 31 and a drive module 32. The data processing module 31 is connected to the first detection element 21 and the drive module 32, respectively. The data processing module 31 is used to match the circular runout data with the action of the drive module 32 to generate compensation data. The drive module 32 is connected to the coating die head 11 and drives the coating die head 11 closer to or away from the coating roller 12 according to the compensation data. The drive module 32 includes a drive element 321 and a transmission assembly 322 connected to it. The transmission assembly 322 is connected to the coating die head 11 and is used to convert the rotational motion of the drive element 321 into linear motion to drive the coating die head 11 to move closer to or away from the coating roller 12.The drive module 32 also includes a second detection element, which is mounted on the drive component 321 and used to detect the rotation angle of the motor shaft of the drive component 321. The data processing module 31 is connected to the second detection element. The second detection element includes an encoder. The coating die head 11 has a discharge port 111, and the first detection element 21 is located between the discharge port 111 and the coating roller 12.

[0126] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A coating apparatus, characterized in that, include: A coating mechanism includes a coating die and a coating roller. The coating die and the coating roller are arranged opposite to each other and have an interval. The coating roller is used to drive the substrate to move, and the coating die is used to coat the substrate that has moved to the interval with a slurry. The detection mechanism is installed on the coating die head and has a first detection element. The first detection element is used to acquire the circular runout data of the coating roller offline. The first detection element has a first state and a second state. In the first state, the first detection element is located within the interval range, and in the second state, the first detection element is located outside the interval range. as well as A compensation mechanism is connected to the first detection element via a signal and to the coating die head via a transmission connection. The compensation mechanism is configured to drive the coating die head to move closer to or further away from the coating roller based on the circular runout data, so as to keep the distance between the coating die head and the coating roller constant.

2. The coating apparatus according to claim 1, characterized in that, The detection mechanism is detachably mounted on the coating die head so that the first detection piece can be removed to an area outside the interval.

3. The coating apparatus according to claim 2, characterized in that, The testing mechanism includes an installation component and a connector. The installation component is detachably installed on the coating die head, one end of the connector is installed on the installation component, and the first testing component is installed on the other end of the connector.

4. The coating apparatus according to claim 3, characterized in that, The connector is an adjustable structure capable of adjusting the position of the first detection element.

5. The coating apparatus according to claim 4, characterized in that, The connector is a deformable component.

6. The coating apparatus according to claim 3, characterized in that, The mounting component is magnetically connected to the coating die head, or the mounting component is detachably connected to the coating die head via a detachable component.

7. The coating apparatus according to claim 1, characterized in that, The detection mechanism includes a mounting component and a connector. The mounting component is mounted on the coating die head, one end of the connector is mounted on the mounting component, and the first detection component is mounted on the other end of the connector. The connector is a deformable component, and the deformation of the connector is used to move the first detection component to an area outside the space between the coating die head and the coating roller.

8. The coating apparatus according to claim 1, characterized in that, The first detection element includes a laser sensor.

9. The coating apparatus according to claim 8, characterized in that, The detection mechanism also includes an adjustment component, which is connected to the laser sensor and is used to adjust the horizontality and parallelism of the laser sensor's spot.

10. The coating apparatus according to any one of claims 1-9, characterized in that, The compensation mechanism includes a data processing module and a drive module. The data processing module is connected to the first detection element and the drive module respectively. The data processing module is used to match the circular runout data with the action of the drive module to generate compensation data. The drive module is connected to the coating die head and drives the coating die head to move closer to or away from the coating roller according to the compensation data.

11. The coating apparatus according to claim 10, characterized in that, The drive module includes a drive component and a transmission assembly connected by a transmission link. The transmission assembly is connected to the coating die head and is used to convert the rotary motion of the drive component into linear motion, so as to drive the coating die head to move towards or away from the coating roller.

12. The coating apparatus according to claim 11, characterized in that, The drive module further includes a second detection element, which is installed on the drive element and used to detect the rotation angle of the motor shaft of the drive element. The data processing module is connected to the second detection element.

13. The coating apparatus according to claim 12, characterized in that, The second detection element includes an encoder.

14. The coating apparatus according to any one of claims 1-9, characterized in that, The coating die head has a discharge port, and in the first state, the first detection element is located between the discharge port and the coating roller.

15. A battery production system, characterized in that, Includes the coating apparatus as described in any one of claims 1-14.

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