A double air nozzle device for preventing the coated pole piece from being scratched

Abstract

The utility model relates to the technical field of lithium battery coating technology, specifically discloses a kind of double wind nozzle device of coating pole piece scratch prevention, including box, main wind nozzle, vice wind nozzle, the inside of box is equipped with shunt cavity, the main wind nozzle is equipped with two and it is symmetrically inwardly inclined and is arranged, and it is communicated with the shunt cavity;The vice wind nozzle is arranged at the outside of main wind nozzle and is perpendicular to pole piece, the air outlet of vice wind nozzle is equipped with retractable baffle;The air outlet side of box is equipped with feedback control system and distance sensing component, the feedback control system is connected with distance sensing component signal, and the feedback control system is connected with retractable baffle transmission.The scheme is by being equipped with main wind nozzle and vice wind nozzle, so that main wind nozzle meets the drying demand when normal coating, vice wind nozzle is automatically air when sensing very close to pole piece, and the air volume of main wind nozzle is supplemented, effectively protects pole piece from being scratched by air nozzle, maintains dry efficiency, improves pole piece quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery coating technology, and in particular to a dual-nozzle device for coating electrode sheets to prevent scratches. Background Technology

[0002] In the production process of lithium-ion batteries, the coating process is a core step in the production of lithium-ion electrodes. The coating process refers to the process of uniformly, continuously and stably coating the prepared electrode slurry (composed of active materials, conductive agents, binders and solvents) with a specific viscosity and solid content onto the surface of the metal current collector (aluminum foil for the positive electrode and copper foil for the negative electrode) through the lip of the coating die to a preset thickness and width, and then drying it to remove the solvent, thereby forming a specific active material loading. The coating process is crucial and directly affects the performance and quality of lithium batteries.

[0003] Currently, in the lithium battery coating process, the electrodes need to be dried in an oven, and the design of the air nozzles plays a crucial role in the drying effect and quality of the electrodes. In existing technologies, common air nozzle structures cannot effectively balance the normal coating drying requirements with electrode protection. When the upper air nozzle continuously dries the electrodes with a high airflow, the electrodes are easily damaged by the strong airflow and scratched by the lower air nozzle. Conversely, when the upper air nozzle continuously dries the electrodes with a low airflow, the electrodes are easily damaged by the airflow from the lower air nozzle and scratched by the upper air nozzle. This requires a significant amount of time for troubleshooting and adjustment, resulting in severe waste of manpower and time, low efficiency, and negatively impacting electrode quality and the yield rate of subsequent battery production, leading to a large amount of scrap. On the other hand, reducing the overall airflow to avoid scratches fails to meet the demand for rapid and efficient drying, resulting in low production efficiency. Therefore, there is an urgent need for an air nozzle structure that can meet the needs of electrode drying and protection under different operating conditions. Utility Model Content

[0004] The purpose of this invention is to provide a dual-nozzle device for preventing scratches on coated electrodes. By setting a main nozzle and a secondary nozzle, the main nozzle meets the drying requirements during normal coating, while the secondary nozzle automatically emits air when it senses that it is very close to the electrode to supplement the air volume of the main nozzle. This effectively protects the electrode from being scratched by the air outlet, maintains drying efficiency, improves electrode quality and production efficiency, and solves the problems encountered in the above-mentioned background technology.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A dual-nozzle device for preventing scratches on coated electrodes includes a housing, a main nozzle, and a secondary nozzle. The housing has a flow-dividing channel inside. Two main nozzles are provided and are symmetrically inclined inwards, communicating with the flow-dividing channel. The secondary nozzles are located outside the main nozzles and perpendicular to the electrode. A retractable baffle is provided at the air outlet of the secondary nozzle. A feedback control system and a distance sensing component are provided on one side of the air outlet of the housing. The feedback control system is signal-connected to the distance sensing component and drive-connected to the retractable baffle.

[0006] In the above scheme, a main air inlet is provided in the middle of the air inlet side of the box, and secondary air inlets are provided on both sides of the air inlet side of the box. The secondary air inlets are symmetrically arranged with the central axis of the main air inlet as the central axis. As a preferred scheme, the main air outlet duct has a "Z" or "K" shaped structure, and the secondary air outlet duct has an "I" shaped structure.

[0007] In the above scheme, a diverter block is installed inside the housing. The diverter block has a rhomboid structure and diverts the airflow from the diverter cavity to the main air nozzles on both sides. As a preferred embodiment, the main air nozzles are at an angle of 30 to 45 degrees to the electrode plate.

[0008] In the above scheme, the box body is provided with side frames on both sides, the feedback control system is installed inside the side frames, and the distance sensing component is installed on the outside of the side frames. The main air nozzle and the auxiliary air nozzle are horizontally arranged on the box body, and the retractable baffle (41) has three working states, namely fully closed, retracted by 50%, and retracted by 100%.

[0009] Compared with existing technologies, the beneficial effects of this invention are as follows: The dual-nozzle device in this solution precisely controls the distance between the electrode and the nozzle through a feedback control system and a distance sensing component, achieving uniformity and stability in the electrode drying process and improving the overall performance and consistency of the lithium battery. The dual-nozzle device effectively prevents the electrode from being scratched by the nozzles through the main and auxiliary nozzles, reducing scratches and defect rates caused by the electrode rubbing against the nozzles, and improving product yield. This dual-nozzle device has a high degree of automation, capable of adjusting the airflow from the nozzles in real time according to changes in the electrode position, eliminating the need for frequent manual intervention, improving production efficiency, providing data for production process optimization and equipment maintenance, and helping to reduce production costs and improve production management. Attached Figure Description

[0010] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is a schematic diagram showing the three states of the retractable baffle in this utility model; Figure 3 This is a schematic diagram of the installation position of the infrared sensor in this utility model. Figure 4 This is a schematic diagram of the servo motor driven retractable baffle of this utility model. Figure 5 This is a flowchart of the PLC control logic of this utility model.

[0011] Numbering in the diagram: 1-Box body; 11-Compartment; 12-Diverter block; 13-Side frame; 14-Diverter cavity; 2-Main air inlet; 21-Main air outlet duct; 22-Main air nozzle; 3-Secondary air inlet; 31-Secondary air outlet duct; 32-Secondary air nozzle; 4-Feedback control system; 41-Retractable baffle; 42-Servo motor; 43-Bearing seat; 44-Screw and nut mechanism; 5-Distance sensing component. Detailed Implementation

[0012] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0013] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0014] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] Example 1, as Figure 1 As shown, a dual-nozzle device for coating electrode sheets to prevent scratches includes a housing 1, a main nozzle 22, and a secondary nozzle 32. The housing 1 has a diversion channel 14 inside to divert the airflow delivered by the main nozzle 22. There are two main nozzles 22, which are symmetrically inclined inward and connected to the diversion channel 14. By inclining inward, the airflow at the outlet can be dispersed over a larger area, thereby stably outputting the airflow blown onto the electrode sheet.

[0016] In this scheme, the main air nozzle 22 mainly provides a constant dry hot air flow. It has a large air outlet area and a stable air outlet structure. The dry hot air flow enters the diversion cavity 14 from the main air inlet 2, then enters the main air outlet duct 21, and finally exits from the main air nozzle 22. It can form a uniform heat exchange area on the electrode surface, which promotes the rapid evaporation of solvent on the electrode.

[0017] The secondary air nozzle 32 is located outside the main air nozzle 22 and perpendicular to the electrode plate. A retractable baffle 41 is provided at the air outlet of the secondary air nozzle 32. The secondary air nozzle 32 is designed with an independent "1"-shaped secondary air outlet duct 31, perpendicular to the electrode plate, and located horizontally outside the main air nozzle 22. The secondary air nozzle 32 is designed with a separate secondary air inlet 3. The dry hot airflow enters a separate flow chamber through the secondary air inlet 3 and then enters the secondary air outlet duct 31.

[0018] A feedback control system 4 and a distance sensing component 5 are provided on one side of the air outlet of the housing 1. The feedback control system 4 and the distance sensing component 5 are connected by a signal line. The feedback control system 4 is connected to the retractable baffle 41. The feedback control system 4 controls the blocking state of the retractable baffle 41 at the air outlet of the secondary air nozzle 32, thereby determining the size of the airflow, affecting the proximity of the electrode, and preventing the air nozzle from scratching the electrode.

[0019] The dual-nozzle device in this solution precisely controls the distance between the electrode and the nozzles through the feedback control system 4 and the distance sensing component 5, achieving uniformity and stability in the electrode drying process and improving the overall performance and consistency of the lithium battery. The dual-nozzle device, with its main nozzle 22 and auxiliary nozzle 32, effectively prevents the electrode from being scratched by the nozzles, reducing scratches and defect rates caused by the electrode rubbing against the nozzles, and improving the product yield. This dual-nozzle device has a high degree of automation, capable of adjusting the airflow from the nozzles in real time according to changes in the electrode position, eliminating the need for frequent manual intervention, improving production efficiency, providing data for production process optimization and equipment maintenance, and helping to reduce production costs and improve production management.

[0020] Example 2, based on the solution of Example 1, please refer to... Figure 1 and Figure 2 The box body 1 has a main air inlet 2 in the middle of the air inlet side, and secondary air inlets 3 on both sides of the air inlet side. The secondary air inlets 3 are symmetrically arranged with the central axis of the main air inlet 2 as the central axis. As a preferred embodiment, the main air outlet duct 21 has a "Z" or "K" shaped structure, and the secondary air outlet duct 31 has an "I" shaped structure.

[0021] In terms of specific layout, the main air inlet 2 is connected to the main air nozzle 22 through the main air outlet duct 21, and the secondary air inlet 3 is connected to the secondary air nozzle 32 through the secondary air outlet duct 31. A compartment 11 is installed inside the air inlet side of the box body 1. The compartment 11 separates the main air outlet duct 21 and the secondary air outlet duct 31, thus separating the air outlet ducts of the main air nozzle 22 and the secondary air nozzle 32. Each of them completes the airflow delivery by cooperating with each other.

[0022] The main air nozzle 22 and the auxiliary air nozzle 32 are horizontally arranged on the housing 1, and a diverter block 12 is installed inside the housing 1. The diverter block 12 has a diamond-shaped structure and diverts the air intake of the diverter cavity 14 to the main air nozzles 22 on both sides. By outputting dry hot air from both sides, the position of the electrode can be stabilized, keeping the electrode at a safe working distance. As a preferred embodiment, the main air nozzle 22 is at an angle of 30 to 45 degrees to the electrode, which can blow air evenly onto the electrode.

[0023] The air outlets installed horizontally on both sides of the same box 1 are divided into main air outlet 22 and auxiliary air outlet 32. The main and auxiliary air outlets use separate air inlet / outlet channels. The air outlet channel of the main air outlet 22 has a "Z" shape design, which helps to accumulate and release air volume. The main air outlet 22 is tilted inward at 30 to 45 degrees to the electrode, which increases the diameter of the air outlet and increases the air outlet area, so as to provide continuous, efficient and stable drying air for the electrode during normal coating process.

[0024] The air outlet of the secondary air nozzle 32 is designed in a "1" shape, perpendicular to the electrode, which helps the air force to be directly fed back to the electrode. A retractable baffle 41 is designed at the air outlet of the secondary air nozzle 32. The baffle in the retractable baffle 41 has the function of blocking the airflow. During normal coating, the baffle can extend to close the air duct. When the distance between the electrode and the air nozzle is too close, the baffle retracts, and the air force of the secondary air nozzle 32 acts on the electrode to quickly create distance, thereby avoiding scratching the outer wall of the electrode.

[0025] Example 3: Based on Example 1 or 2, the following method is used for the installation and layout of the feedback control system 4 and the distance sensing component 5 in order to install and implement them.

[0026] Side brackets 13 are screwed onto both sides of the housing 1. The feedback control system 4 is installed inside the side brackets 13, and the distance sensing component 5 is installed on the outside of the side brackets 13. (See attached image for details on distance sensing component 5.) Figure 3 As shown, the main and auxiliary air nozzles are located on both sides of the box 1, with a funnel-shaped structure to facilitate the output of dry and hot airflow.

[0027] Please see Figure 4The feedback control system 4 includes a servo motor 42, a bearing housing 43, a lead screw and nut mechanism 44, and a PLC. The servo motor 42 is installed inside the side frame 13, and its output end is rotatably connected to the lead lever of the lead screw and nut mechanism 44 via a coupling. When the output end of the servo motor 42 is on the same horizontal plane as the retractable baffle 41, it can be directly rotatably connected to the lead lever of the lead screw and nut mechanism 44. When the output end of the servo motor 42 is not on the same horizontal plane as the retractable baffle 41, it can be rotatably connected to the lead lever of the lead screw and nut mechanism 44 via a sprocket or pulley mechanism.

[0028] The nut of the lead screw and nut mechanism 44 is fixedly connected to the telescopic baffle 41. The two ends of the lead screw and nut mechanism 44 are mounted on bearing seats 43, which are installed on the outside of the auxiliary air nozzle 32. The PLC is connected to the servo motor 42 and the distance sensing component 5 respectively. The PLC controls the start and stop of the servo motor 42 according to the signal from the distance sensing component 5, and then the servo motor 42 controls the extension and retraction of the telescopic baffle 41 through the lead screw and nut mechanism 44 to adjust the airflow output from the auxiliary air nozzle 32.

[0029] The retractable baffle 41 has three working states: fully closed, 50% retracted, and 100% retracted. During normal coating, the retractable baffle 41 is in the closed state. When the distance sensing component 5, in conjunction with the feedback control system 4, detects that the distance between the nozzle and the electrode is ≤5mm, the retractable baffle 41 retracts by 50%. When the distance between the nozzle and the electrode is ≤3mm, the retractable baffle 41 retracts by 100%. When the distance between the nozzle and the electrode is >5mm, the retractable baffle 41 automatically closes, and the auxiliary nozzle 32 stops venting.

[0030] By installing a parallel retractable baffle 41 at the air outlet of the secondary air nozzle 32, the retractable baffle 41 has a three-stage state stroke and a push-pull design controlled by a servo motor 42. The servo motor 42 is installed in the side frame 13 inside the fixed box 1, which is close to the secondary air nozzle 32. When the retractable baffle 41 retracts, the dry hot airflow of the secondary air outlet duct 31 starts to work, and the secondary air nozzle 32 automatically starts to output air.

[0031] The feedback control system 4 employs a PLC (Programmable Logic Controller), a standard motion control system for automated production lines. Equipped with specialized software, it possesses powerful data processing and control command generation capabilities. Installed in an electrical cabinet outside the housing 1, it receives distance data transmitted from the distance sensing component 5 via signal lines. A first-stage threshold (≤5mm) is set, and the PLC outputs the analyzed control quantity as a command to the driver. The driver drives the servo motor 42 to rotate, which, via a lead screw, retracts the retractable baffle 41 in the auxiliary air nozzle 32 to 50%. The same logic is used to set a second-stage threshold (≤3mm), opening the retractable baffle 41 of the auxiliary air nozzle 32 to 100%. When the transmitted distance is >5mm, the retractable baffle 41 of the auxiliary air nozzle 32 is pushed back to full closure. By forming a closed loop in this solution, a "measurement-transmission-calculation-analysis-command-execution-feedback" control system found in existing systems, it is easier to apply to the lithium battery coating process.

[0032] In implementation, the distance sensing component 5 is an infrared sensor. It calculates the distance between the secondary air nozzle 32 and the electrode plate based on the time difference between emitting and receiving infrared light, and transmits this information to the PLC via a signal line. The distance sensing component 5 of the secondary air nozzle 32 uses infrared sensing. When it detects that the distance between the electrode plate and the secondary air nozzle 32 is too close (3-5mm), it sends feedback to the feedback control system 4. Upon receiving the signal, the feedback control system 4 automatically retracts the baffle of the secondary air nozzle 32, allowing the airflow in the secondary air outlet duct 32 to supplement the airflow and precisely control the distance between the electrode plate and the secondary air nozzles on both sides, replacing manual adjustment.

[0033] Infrared sensing technology is used to accurately monitor the distance between the electrode and the main / auxiliary nozzles. A side frame 13 is fixed to the outside of the box 1 of the coating process oven. A high-precision STMicroelectronics VL53L4ED infrared sensor is installed on the outside of the side frame 13, directly facing the electrode. The box 1 uses polyphenylene sulfide (PPS) high-temperature resistant material as a protective shell. When the infrared sensor is working, it emits an infrared beam. When the electrode passes through the monitoring range of the infrared sensor during transport, the infrared light is reflected back from the electrode surface. Based on the time difference between the emission and reception of the infrared light, the infrared sensor uses a logical calculation formula to quickly and accurately calculate the distance between the nozzle and the electrode, and transmits the result to the feedback control system 4 via a signal line. This non-manual, non-contact measurement method has many advantages: fast response speed, real-time capture of minute changes in the electrode position, high accuracy, and no physical damage to the electrode.

[0034] Example 4: To better and more systematically introduce the workflow of this solution, a comprehensive overview and flowchart are provided below. The workflow is as follows: Figure 5 As shown.

[0035] Step 1: Component Installation: Install a dual-nozzle device in the oven during the lithium battery coating process. The dual-nozzle device is as follows: Figure 1 The fixed housing 1 shown has a main air nozzle 22 with a "Z" or "K" shaped main air outlet duct 21, which forms a 30-45 degree angle with the electrode conveying path. A secondary air nozzle 32 is installed horizontally outside the main air nozzle 22, with an "I" shaped secondary air outlet duct 31, perpendicular to the electrode conveying direction. A retractable baffle 41 is assembled to the secondary air nozzle 32 and connected to the lead screw of a servo motor 42 fixed to the outside of the housing 1 and close to the secondary air nozzle 32, ensuring that the retractable baffle 41 can switch between three states: 50% retraction, 100% retraction, and complete closure. A high-precision infrared sensor of STMicroelectronics VL53L4ED model is installed on the outside of the box 1, facing the electrode conveying trajectory. The outside is wrapped with a high-temperature resistant polyphenylene sulfide protective shell. The infrared sensor is connected to the PLC controller in the external electrical cabinet of the oven through a signal line to complete the circuit connection between the PLC and the driver and servo motor 42. The preset control software is loaded and the data transmission channel is debugged.

[0036] Step Two: System Initialization: Start the oven and control system, check whether the power supply and signal transmission of each component are normal, calibrate the infrared sensor, and test the distance measurement accuracy using standard spacing templates (such as 5mm, 3mm) to ensure that the error is ≤0.1mm. Adjust the travel of the retractable baffle 41: Control the servo motor 42 to drive the baffle to complete the "close - 50% retraction - 100% retraction - close" cycle, confirming that the switching between each state is smooth and there is no jamming or overtravel.

[0037] Step 3: Normal Drying Process (Electrode Distance to Nozzle > 5mm): The electrode enters the oven via a conveyor. At this time, the infrared sensor monitors the distance between the electrode and the nozzle in real time. If the detection result is > 5mm, the drying hot airflow enters the distribution chamber 14 through the flow chamber. The airflow is ejected through the main nozzle 22, forming a uniform heat exchange area on the electrode surface, and the solvent begins to evaporate. The PLC receives the distance data (> 5mm) transmitted by the infrared sensor, determines that the auxiliary nozzle 32 does not need to be activated, and outputs a command to the driver to drive the servo motor 42 to push the retractable baffle 41 to a fully closed state. The small amount of hot airflow in the auxiliary air outlet duct 31 is temporarily not working.

[0038] Step 4: First Stage Adjustment (Electrode Distance from Nozzle ≤ 5mm and > 3mm): Due to transmission fluctuations, the electrode moves closer to the nozzle. The infrared sensor detects a distance ≤ 5mm and immediately transmits the data to the PLC via the signal line. After analyzing the data, the PLC triggers the first stage threshold and outputs a control command to the driver, instructing the servo motor to start. The servo motor, through the transmission of the lead screw and nut mechanism 44, retracts the telescopic baffle 41 by 50%, opening part of the secondary air outlet duct 31. Dry, hot air is ejected from the secondary nozzle 32 and blows vertically toward the electrode. The position of the electrode is finely adjusted using airflow pressure and wind force, while simultaneously assisting the main nozzle 22 in enhancing local heat exchange.

[0039] Step 5: Second Stage Adjustment (When the distance between the electrode and the nozzle is ≤3mm): The electrode is moved closer to the nozzle, and the infrared sensor detects a distance of ≤3mm, triggering an emergency data transmission to the PLC. The PLC identifies the second stage threshold and outputs an enhanced control command. The driver drives the servo motor 42 to increase its stroke, the telescopic baffle 41 retracts by 100%, the secondary air outlet duct 31 fully opens, and more hot air is ejected from the secondary nozzle 32, forming a stronger vertical airflow and wind force. The airflow pressure further adjusts the electrode position to prevent the electrode from contacting the nozzle.

[0040] Step Six: Restoring Normal State (Electrode Distance from Nozzle > 5mm): The electrode moves away from the nozzle due to airflow adjustment or stable transmission. The infrared sensor detects a distance > 5mm and transmits the data to the PLC. The PLC determines the electrode position is safe and outputs a closing command. The driver drives the servo motor 42 to rotate in the opposite direction. The retractable baffle 41 is pushed back to a fully closed state, the secondary nozzle 32 stops airflow, and the system returns to the normal drying mode where only the main nozzle 22 operates. Throughout the process, the infrared sensor continuously monitors the distance → data is transmitted to the PLC in real time → the PLC analyzes the data based on thresholds and outputs commands → the servo motor 42 drives the baffle to move → changes in electrode position are re-detected by the sensor, forming a closed-loop control of "measurement-transmission-calculation-execution-feedback" to ensure electrode drying efficiency and operational safety.

[0041] The following are examples comparing the air nozzles in existing ovens with those in ovens using this dual-nozzle device.

[0042] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dual-nozzle device for coating electrodes to prevent scratches, characterized in that: The device includes a housing (1), a main air nozzle (22), and a secondary air nozzle (32). The housing (1) has a flow distribution channel (14) inside. There are two main air nozzles (22) that are symmetrically inclined inward and connected to the flow distribution channel (14). The secondary air nozzle (32) is located outside the main air nozzle (22) and perpendicular to the electrode plate. The outlet of the secondary air nozzle (32) is provided with a retractable baffle (41). The outlet side of the housing (1) is provided with a feedback control system (4) and a distance sensing component (5). The feedback control system (4) is signal-connected to the distance sensing component (5), and the feedback control system (4) is drive-connected to the retractable baffle (41).

2. The dual-nozzle device for preventing scratches on coated electrodes according to claim 1, characterized in that: The box (1) has a main air inlet (2) in the middle of the air inlet side, and secondary air inlets (3) on both sides of the air inlet side. The secondary air inlets (3) are symmetrically arranged with the central axis of the main air inlet (2) as the central axis.

3. The dual-nozzle device for preventing scratches on coated electrodes according to claim 2, characterized in that: The main air inlet (2) is connected to the main air nozzle (22) through the main air outlet channel (21), and the secondary air inlet (3) is connected to the secondary air nozzle (32) through the secondary air outlet channel (31). A compartment (11) is installed inside the air inlet side of the box (1), and the compartment (11) separates the main air outlet channel (21) and the secondary air outlet channel (31).

4. The dual-nozzle device for preventing scratches on coated electrodes according to claim 3, characterized in that: The main air outlet duct (21) has a "Z" or "K" shaped structure, and the secondary air outlet duct (31) has an "I" shaped structure.

5. The dual-nozzle device for preventing scratches on coated electrodes according to claim 1, characterized in that: The box (1) is equipped with a diverter block (12), which has a rhomboid structure. The diverter block (12) diverts the air intake of the diverter cavity (14) to the main air nozzles (22) on both sides.

6. The dual-nozzle device for preventing scratches on coated electrodes according to claim 5, characterized in that: The main air nozzle (22) is at an angle of 30 to 45 degrees to the electrode plate.

7. The dual-nozzle device for preventing scratches on coated electrodes according to claim 1, characterized in that: The box (1) has side frames (13) on both sides, the feedback control system (4) is installed inside the side frames (13), and the distance sensing component (5) is installed outside the side frames (13).

8. The dual-nozzle device for preventing scratches on coated electrodes according to claim 7, characterized in that: The feedback control system (4) includes a servo motor (42), a bearing housing (43), a lead screw and nut mechanism (44), and a PLC. The servo motor (42) is installed inside the side frame (13). The output end of the servo motor (42) is rotatably connected to the lead lever of the lead screw and nut mechanism (44) through a coupling. The nut of the lead screw and nut mechanism (44) is fixedly connected to the telescopic baffle (41). The two ends of the lead lever of the lead screw and nut mechanism (44) are installed on the bearing housing (43). The bearing housing (43) is installed on the outside of the auxiliary air nozzle (32). The PLC is connected to the servo motor (42) and the distance sensing component (5) respectively.

9. A dual-nozzle device for preventing scratches on coated electrodes according to claim 8, characterized in that: The distance sensing component (5) is an infrared sensor. The distance sensing component (5) calculates the distance between the auxiliary nozzle (32) and the electrode based on the time difference between emitting and receiving infrared rays, and transmits the distance to the PLC through a signal line.

10. A dual-nozzle device for preventing scratches on coated electrodes according to claim 1, characterized in that: The main air nozzle (22) and the auxiliary air nozzle (32) are horizontally arranged on the box body (1). The retractable baffle (41) has three working states: fully closed, retracted by 50%, and retracted by 100%.

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