Coating and winding apparatus

Abstract

The utility model discloses a kind of coating winding devices, it is related to lithium battery manufacturing technical field, including porous roller, top block integrated suction nozzle, negative pressure controller and three groups of self-cleaning module, two groups of top integrated suction nozzle symmetrical rotation installation at the both ends of porous roller, porous roller includes three groups of independent air chamber, negative pressure controller and three groups of self-cleaning module are communicated with three groups of air chamber respectively by top block integrated suction nozzle. Through the collaborative design of micropore and internal independent partition air chamber, combined with top block integrated suction nozzle flow guide and PLC controller dynamic negative pressure control, realize first layer pole piece adhesive tape adsorption fixation, eliminate the problem of bag, wrinkle and colloid residue;Integrated high pressure pulse self-cleaning module solves the problem of channel blockage, high-speed winding, winding efficiency is improved, tension fluctuation change is small, copper foil winding wrinkle rate is reduced, and adhesive tape cost is saved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery manufacturing technology, and specifically relates to a coating and winding device. Background Technology

[0002] In the coating process of lithium-ion battery electrodes, the winding quality directly affects the consistency of battery performance. Traditional winding processes use double-sided tape to fix the first layer of electrodes, which has the following defects: 1. Uneven tape adhesion: Manual operation can easily lead to misalignment of the first end of the electrode, resulting in local stress concentration, causing wrinkles or even tape breakage during subsequent winding; 2. Residual adhesive contamination: Residue after tape peeling contaminates the roller surface, increasing cleaning and maintenance costs; 3. Poor adaptability to ultra-thin foils: Copper / aluminum foils below 6μm have low strength, and the tape removal can easily cause the foil to tear or the coating to peel off.

[0003] Therefore, there is an urgent need to develop a highly integrated and fast-responding winding and fixing device to achieve damage-free and high-precision electrode winding control. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a coating and winding device to solve the problems mentioned in the background art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A coating and winding device includes a porous roller, a top block integrated suction nozzle, a negative pressure controller, and three sets of self-cleaning modules. Two sets of top integrated suction nozzles are symmetrically rotated and installed at both ends of the porous roller. The porous roller includes three sets of independent air chambers. The negative pressure controller and the three sets of self-cleaning modules are all connected to the three sets of air chambers through the top block integrated suction nozzles.

[0007] The negative pressure controller is used to individually control the negative pressure intensity of the three independent air chambers, and the self-cleaning module is used to perform pulse cleaning on the three independent air chambers after winding. The three independent air chambers can realize zoned negative pressure control to suppress the stress concentration problem of ultra-thin electrode sheets. Compared with the traditional single air chamber setting, it achieves fault isolation effect and avoids the work process from being affected by the damage of one air chamber.

[0008] Preferably, the surface of the porous roller is uniformly distributed with a honeycomb-shaped micropore array.

[0009] Uniform adsorption of the electrode is achieved through evenly distributed micropores.

[0010] Preferably, each air chamber has at least five micropores distributed circumferentially.

[0011] This ensures the adsorption effect when the electrode tip adheres to the surface of the gas chamber.

[0012] Preferably, a fluororubber sealing ring is installed on the top block integrated suction nozzle, and the top block integrated suction nozzle and the porous roller are dynamically rotated and sealed by the fluororubber sealing ring.

[0013] Compared to traditional O-rings, fluororubber sealing rings have stronger wear resistance and practicality due to their material properties; compared to traditional O-rings, fluororubber sealing rings have a higher compression ratio, which fills the shaft end machining error when the porous roller rotates relative to the top block integrated suction nozzle, preventing negative pressure from leaking from the gap.

[0014] Preferably, the negative pressure controller includes a variable frequency centrifugal fan, and the top block integrated suction nozzle includes three sets of annular negative pressure chambers. One end of each of the three sets of annular negative pressure chambers is connected to three independent air chambers, and the other end is independently connected to the negative pressure controller and the variable frequency centrifugal fan through a metal hose.

[0015] The variable frequency centrifugal fan generates negative pressure in three air chambers through three sets of annular negative pressure chambers, and independently controls the magnitude of the negative pressure in the three air chambers.

[0016] Preferably, the negative pressure controller further includes a PLC controller and multiple sets of pressure sensors installed in the air chamber, all of which are electrically connected to the PLC controller.

[0017] Pressure sensors monitor the pressure in each air chamber in real time, and the PLC controller dynamically adjusts the negative pressure value according to the winding speed and electrode material.

[0018] Preferably, the variable frequency centrifugal fan is electrically connected to the PLC controller, and the variable frequency centrifugal fan independently controls the negative pressure of the three air chambers through the annular negative pressure chamber.

[0019] The pressure output of the variable frequency centrifugal fan to the three air chambers is intelligently controlled by a PLC controller.

[0020] Preferably, the air chamber in contact with the electrode is the first air chamber, and the other two sets of air chambers along the extension direction of the electrode are the middle air chamber and the tail air chamber, respectively, and the preset air pressure of the first air chamber, the middle air chamber and the tail air chamber gradually decreases.

[0021] The first air chamber is used to quickly adsorb and fix the electrode sheet when it comes into contact with the porous roller, offsetting the inertial impact when winding starts. High pressure is required to ensure complete adhesion between the electrode sheet and the roller surface, eliminating the risk of misalignment from manual tape fixing. The middle air chamber is used to dynamically balance the tension during winding, avoiding the risk of the ultra-thin foil being stretched and broken due to continuous high negative pressure. The PLC controller adjusts the air pressure in real time according to the winding speed and electrode material, appropriately increasing the pressure during high-speed winding and decreasing the pressure during low-speed winding to simulate the "elastic buffer" effect. The tail air chamber is used to prevent the electrode sheet from loosening at the end of winding, while also reducing the difficulty of tearing.

[0022] Preferably, the self-cleaning module includes a high-pressure air pump, a solenoid valve, an airflow diversion channel, and a pulse controller. The high-pressure air pump is electrically connected to the pulse controller, and the high-pressure air pump is connected to the integrated suction nozzle of the top block through the airflow diversion channel. The solenoid valve is installed in the airflow diversion channel.

[0023] During winding, the solenoid valve is closed and the self-cleaning module is shut down; after winding is completed, the solenoid valve is opened, the high-pressure air pump outputs compressed air, and the pulse controller triggers pulse airflow at regular intervals, which blows away residual dust in the channel through the airflow diversion channel.

[0024] Preferably, the top block integrated nozzle includes three sets of pulse cleaning channels, one end of each of the three sets of pulse cleaning channels is connected to three sets of independent air chambers, and the other end of each of the three sets of pulse cleaning channels is connected to three sets of airflow diversion channels.

[0025] The airflow in the airflow diversion channel cleans the three independent air chambers through the pulse cleaning channel.

[0026] This invention proposes a coating and winding device that, through the coordinated design of micropores and internally independent partitioned air chambers, combined with the top block integrated suction nozzle for airflow guidance and PLC controller dynamic negative pressure control, achieves tape-free fixation of the first-layer electrode sheet, eliminating problems such as bulging, wrinkles, and adhesive residue. An integrated high-pressure pulse self-cleaning module solves the problem of channel blockage, enabling high-speed winding, improved roll-changing efficiency, minimal tension fluctuations, reduced copper foil winding wrinkles, and savings on tape costs. This device is compatible with the retrofitting of existing coating machines, and its modular design supports the production of multiple electrode specifications. It overcomes the technical bottlenecks of positioning accuracy and tension balance in ultra-thin foil winding, providing a highly reliable solution for lithium battery manufacturing.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Fig. 1 This is a three-dimensional structural diagram of a coating and winding device proposed in this utility model;

[0029] Fig. 2 This is a three-dimensional structural diagram of a porous roller for a coating and winding device proposed in this utility model.

[0030] Fig. 3 This is a three-dimensional structural diagram of the negative pressure controller of the coating and winding device proposed in this utility model.

[0031] Reference numerals: 1. Perforated roller; 2. Top block integrated suction nozzle; 3. Negative pressure controller; 4. Self-cleaning module; 5. Micropore; 6. Air chamber; 7. Fluororubber sealing ring; 8. Variable frequency centrifugal fan; 9. Pressure sensor; 10. PLC controller. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] Example 1

[0034] refer to Figs. 1 to 3 The coating and winding device described in this embodiment includes a porous roller 1, a top block integrated suction nozzle 2, a negative pressure controller 3, and three sets of self-cleaning modules 4. Two sets of top integrated suction nozzles 2 are symmetrically rotated and installed at both ends of the porous roller 1. The porous roller 1 includes three sets of independent air chambers 6. The negative pressure controller 3 and the three sets of self-cleaning modules 4 are all connected to the three sets of air chambers 6 through the top block integrated suction nozzles 2 respectively.

[0035] The surface of the porous roller 1 is uniformly distributed with an array of honeycomb-shaped micropores 5.

[0036] Preferably, the pore diameter of the micropore 5 is 0.5-1.5 mm, the center distance between adjacent micropores 5 is 2-3 mm, and the porosity is 15%-25%.

[0037] Each gas chamber 6 has at least five micropores 5 distributed circumferentially to ensure the adsorption effect when the end of the electrode is attached to the surface of the gas chamber 6.

[0038] The top integrated suction nozzle 2 is equipped with a fluororubber sealing ring 7. The top integrated suction nozzle 2 is rotatably engaged with the shaft ends of the porous roller 1 through the fluororubber sealing ring 7, and is fixed as a whole to the coating machine take-up frame. When the porous roller 1 rotates, the top integrated suction nozzle 2 remains stationary, and the top integrated suction nozzle 2 and the porous roller 1 are dynamically rotated and sealed through the fluororubber sealing ring 7.

[0039] The compression rate of the fluororubber sealing ring 7 is 30%-40%.

[0040] The negative pressure controller 3 includes a variable frequency centrifugal fan 8, multiple pressure sensors 9, and a PLC controller 10. At least one pressure sensor 9 is installed in each air chamber 6 to monitor the pressure in each chamber 6 in real time. All pressure sensors 9 are electrically connected to the PLC controller 10. The pressure information obtained by the pressure sensors 9 is transmitted to the PLC controller 10. The variable frequency centrifugal fan 8 is also electrically connected to the PLC controller 10. The PLC controller 10 controls the variable frequency centrifugal fan 8 to independently and dynamically adjust the negative pressure values ​​of the three air chambers 6 according to the winding speed and electrode material.

[0041] The top-mounted integrated suction nozzle 2 includes three sets of annular negative pressure chambers. One end of each of the three annular negative pressure chambers is connected to one of the three independent air chambers 6, and the other end is independently connected to the negative pressure controller 3 and the variable frequency centrifugal fan 8 via a metal hose. The variable frequency centrifugal fan 8 independently controls the negative pressure of the three air chambers 6.

[0042] Specifically, the first gas chamber (6) in contact with the electrode is designated as the first gas chamber. Along the electrode's extension direction, the other two gas chambers (6) are designated as the middle and final gas chambers, respectively. The preset gas pressures of the first, middle, and final gas chambers gradually decrease. For example, the negative pressure value of the first gas chamber is -800 to -1000 Pa, the negative pressure value of the middle gas chamber is 0 to -400 Pa, and the negative pressure value of the final gas chamber is 0 to -250 Pa.

[0043] The first air chamber is used to quickly adsorb and fix the electrode sheet when it comes into contact with the porous roller 1, offsetting the inertial impact when winding starts. High pressure is required to ensure complete adhesion between the electrode sheet and the roller surface, eliminating the risk of misalignment caused by manual tape fixing. The middle air chamber is used to dynamically balance the tension during winding, avoiding the risk of the ultra-thin foil being stretched and broken due to continuous high negative pressure. The PLC controller 10 adjusts the air pressure in real time according to the winding speed and electrode material, appropriately increasing the pressure during high-speed winding and decreasing the pressure during low-speed winding to simulate the "elastic buffer" effect. The tail air chamber is used to prevent the electrode sheet from loosening at the end of winding, while reducing the difficulty of tearing.

[0044] The top block integrated nozzle 2 includes three sets of pulse cleaning channels, one end of which is connected to three sets of independent air chambers 6. The self-cleaning module 4 includes a high-pressure air pump, a solenoid valve, an airflow diversion channel, and a pulse controller. The high-pressure air pump is electrically connected to the pulse controller. The high-pressure air pump is connected to the top block integrated nozzle 2 through the airflow diversion channel. The solenoid valve is installed in the airflow diversion channel. The airflow diversion channel and the pulse cleaning channel are connected one-to-one.

[0045] Preferably, both the solenoid valve and the pulse controller are electrically connected to the PLC controller 10. When the cleaning program needs to be started, the PLC controller 10 controls the solenoid valve and the pulse controller to open, opening the channel between the airflow diversion channel, the pulse cleaning channel, and the air chamber 6. The high-pressure air pump outputs compressed air, and the pulse controller triggers pulse airflow at regular intervals to blow away residual dust in the channel in the reverse direction, cleaning the air chamber 6 and preventing the micropores 5 from becoming blocked.

[0046] Installation and commissioning: Use a forklift to horizontally hoist the perforated roller 1 onto the coating machine take-up frame, and adjust the parallelism error between the axis of roller 1 and the unwinding roller to ≤0.1mm / m; push the top block integrated suction nozzle 2 into the shaft ends of the perforated roller 1, and fix the top block integrated suction nozzle 2 onto the perforated roller 1 by tightening the high-strength bolts, and check that the compression of the fluororubber sealing ring 7 is ≥2mm to ensure airtightness; install the metal hoses one by one with the annular negative pressure chambers, start the variable frequency centrifugal fan 8, and preset the first end air chamber pressure to -900Pa, the middle air chamber pressure to -300Pa, and the tail end air chamber pressure to -200Pa through the PLC controller 10.

[0047] First-layer electrode adsorption and winding: The first end of the electrode is laid flat on the surface of the porous roller 1, covering at least 5 micropores 5; the PLC controller 10 controls the negative pressure controller 3, and applies high negative pressure to the porous roller 1 through the top block integrated suction nozzle 2 to quickly complete the adsorption and fixation of the electrode; winding is started in low speed mode and gradually increased in speed. The pressure sensor 9 provides real-time feedback of tension data, and the PLC controller 10 dynamically adjusts the negative pressure value to ensure that the tension fluctuation is ≤±1.5%.

[0048] Roll changing and self-cleaning: After winding to the set length, the PLC controller 10 controls the negative pressure to return to zero, triggering the self-cleaning module 4. The pulse airflow blows the micropores 5 in the opposite direction through the top block integrated suction nozzle 2; the full roll of electrode is removed, and the adsorption process is repeated.

[0049] This lithium-ion battery coating and winding multi-hole roller and top block integrated negative pressure suction nozzle device, through the coordinated design of micropores 5 and internal independently partitioned air chambers 6, combined with the air guiding of the top block integrated suction nozzle 2 and the dynamic negative pressure control of the PLC controller 10, achieves tape-free fixation of the first layer of electrode sheet, eliminating problems such as bulging, wrinkles, and adhesive residue. The integrated high-voltage pulse self-cleaning module 4 solves the problem of channel blockage, high-speed winding, improved roll-changing efficiency, small tension fluctuations, reduced copper foil winding wrinkles, and savings on tape costs. This device is compatible with the retrofitting of existing coating machines, and its modular design supports the production of multiple electrode sheet specifications. It overcomes the technical bottlenecks of ultra-thin foil winding positioning accuracy and tension balance, providing a highly reliable solution for lithium battery manufacturing.

[0050] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A coating and winding device, characterized in that: It includes a multi-hole roller (1), a top block integrated suction nozzle (2), a negative pressure controller (3) and three sets of self-cleaning modules (4). Two sets of top integrated suction nozzles (2) are symmetrically rotated and installed at both ends of the multi-hole roller (1). The multi-hole roller (1) includes three sets of independent air chambers (6). The negative pressure controller (3) and the three sets of self-cleaning modules (4) are all connected to the three sets of air chambers (6) through the top block integrated suction nozzle (2).

2. The coating and winding device according to claim 1, characterized in that: The surface of the porous roller (1) is uniformly distributed with a honeycomb-shaped array of micropores (5).

3. The coating and winding device according to claim 1, characterized in that: Each air chamber (6) has at least five micropores (5) distributed circumferentially.

4. The coating and winding device according to claim 1, characterized in that: The top block integrated suction nozzle (2) is equipped with a fluororubber sealing ring (7), and the top block integrated suction nozzle (2) and the porous roller (1) are dynamically sealed by the fluororubber sealing ring (7).

5. The coating and winding device according to claim 1, characterized in that: The negative pressure controller (3) includes a variable frequency centrifugal fan (8), and the top block integrated suction nozzle (2) includes three sets of annular negative pressure chambers. One end of each of the three sets of annular negative pressure chambers is connected to three sets of independent air chambers (6), and the other end is independently connected to the negative pressure controller (3) and the variable frequency centrifugal fan (8) through a metal hose.

6. The coating and winding device according to claim 5, characterized in that: The negative pressure controller (3) also includes a PLC controller (10) and multiple pressure sensors (9) installed in the air chamber (6), and the multiple pressure sensors (9) are electrically connected to the PLC controller (10).

7. The coating and winding device according to claim 6, characterized in that: The variable frequency centrifugal fan (8) is electrically connected to the PLC controller (10). The variable frequency centrifugal fan (8) independently controls the negative pressure of the three air chambers (6) through the annular negative pressure chamber.

8. The coating and winding device according to claim 7, characterized in that: The first gas chamber is the gas chamber in contact with the electrode. The other two gas chambers (6) along the extension direction of the electrode are the middle gas chamber and the tail gas chamber, respectively. The gas pressure of the first gas chamber, the middle gas chamber and the tail gas chamber gradually decreases.

9. The coating and winding device according to claim 1, characterized in that: The self-cleaning module (4) includes a high-pressure air pump, a solenoid valve and an airflow diversion channel. The high-pressure air pump is connected to the top block integrated nozzle (2) through the airflow diversion channel, and the solenoid valve is installed in the airflow diversion channel.

10. The coating and winding apparatus according to claim 9, characterized in that: The top block integrated nozzle (2) includes three sets of pulse cleaning channels. One end of each of the three sets of pulse cleaning channels is connected to one of the three independent air chambers (6), and the other end of each of the three sets of pulse cleaning channels is connected to one of the three airflow diversion channels.

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