A lithium battery winding system and process

Abstract

This invention relates to the field of lithium battery technology, and in particular to a lithium battery winding system and process. The system includes an unwinding unit, a leveling unit, a film-tearing unit, a winding unit, and a material unloading unit. The winding unit includes a film stacking mechanism, a fixed shaft, a rotation drive mechanism, and a cutting mechanism. The film stacking mechanism forces multiple film materials to be stacked, the rotation drive mechanism drives the fixed shaft to rotate, and the cutting mechanism cuts the connection between the film material and the battery cell. One side of the fixed shaft has a notch, within which a clamping module is installed. The clamping module is used to clamp the film material inserted into the notch. This invention, by providing a notch on the fixed shaft to accommodate the first end of the stacked structure of the positive electrode, separator, and negative electrode, and clamping it with a clamping module, has a simple structure and requires little space, enabling reliable core extraction from small lithium batteries.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a lithium battery winding system and process. Background Technology

[0002] Currently, lithium batteries are being used more and more widely, becoming one of the core components in electronic devices. The winding process is one of the manufacturing processes for lithium batteries. It involves stacking and winding the positive electrode, separator, and negative electrode to form a cylindrical structure. The separator ensures that the positive and negative electrodes do not come into contact, thus preventing short circuits.

[0003] Currently, the winding process uses two rollers to clamp the positive electrode, separator, and negative electrode for winding. However, the structure of the two rollers is not stable enough in clamping the positive electrode, separator, and negative electrode. To address this, Chinese utility model patent No. 202021761302.8 discloses a separator clamping mechanism for a lithium battery winding machine. This mechanism separates the other two separator needles by controlling the retraction of the spring-loaded separator needles, thereby preventing core pulling.

[0004] However, this method still has the following shortcomings: the structure is relatively complex, and it still requires two sets of mechanisms to work together to achieve this effect. It is only suitable for extracting taller lithium battery cells, but not suitable for application in small cells. Summary of the Invention

[0005] This invention addresses the problems of existing technologies by providing a lithium battery winding system and process, which has a simple structure and ensures stable core pulling.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This invention provides a lithium battery winding system, comprising an unwinding unit, a leveling unit, a film-tearing unit, a winding unit, and a cutting unit. The unwinding unit releases multiple film materials, the leveling unit levels the multiple film materials, the film-tearing unit removes release paper from the leveled film materials, the winding unit stacks and winds the multiple film materials to form a battery cell, and the cutting unit removes the battery cell from the winding unit. The winding unit includes a film stacking mechanism, a fixed shaft, a rotation drive mechanism, and a cutting mechanism. The film stacking mechanism forces the multiple film materials to be stacked sequentially, the rotation drive mechanism drives the fixed shaft to rotate, and the cutting mechanism cuts off the connection between the film material and the battery cell. One side of the fixed shaft has a notch for accommodating the stacked film materials, and a clamping module is provided within the notch; the clamping module clamps the film material inserted into the notch and stacked.

[0008] Furthermore, the clamping module includes a movable component, a fixed component, and an electromagnetic structure. The fixed component is installed on the inner top wall of the notch, the movable component is movably disposed on the inner bottom wall of the notch, and the driver is installed inside the fixed shaft. The driver is used to drive the movable component to move closer to or away from the fixed component.

[0009] Both the moving and fixed parts are made of magnetizable metal. The electromagnetic structure is used to magnetize the fixed part when energized so that the fixed part magnetically attracts the moving part.

[0010] Furthermore, the fixed component has multiple magnetized posts at the end opposite to the movable component. The electromagnetic structure includes multiple coils, each coil being wound around a corresponding magnetized post. An electric slip ring is provided inside the fixed shaft, and the coils and the electric slip ring are electrically connected. The movable component has several guide posts at the end opposite to the fixed component. Several guide holes are provided at the bottom of the notch, each guide hole being movably configured to correspond with a corresponding guide post. Springs are wound around the guide posts, and the springs are used to force the movable component to move in the direction of the fixed component. A limiting component is provided at the bottom of the guide post to prevent the guide post from disengaging from the guide hole.

[0011] Furthermore, the winding unit also includes a sensor and a welding mechanism. The sensor is used to sense the number of rotations of the fixed shaft and its current posture, and the sensor is signal-connected to the rotation drive mechanism. The welding mechanism is used to weld the electrode sheet to the corresponding film material.

[0012] Furthermore, the unloading unit includes an unloading and conveying mechanism, a pressing mechanism, and an adhesive applicator. The pressing mechanism is used to press the battery cell to maintain its shape. The adhesive applicator is used to apply adhesive tape to the end of the battery cell after it has been cut by the cutting mechanism. The pressing mechanism has a suction cup for picking up the battery cell. The unloading and conveying mechanism is used to drive the pressing mechanism to move horizontally and move vertically.

[0013] The present invention also provides a process for using the above-described lithium battery winding system, comprising the following steps:

[0014] A. The positive electrode sheet, separator, and negative electrode sheet are unwound and wound through the unwinding unit;

[0015] B. Level the positive electrode, separator, and negative electrode respectively;

[0016] C. After stacking the positive electrode, separator, and negative electrode in sequence, the plates are transferred to the notch of the fixed shaft and clamped by the clamping module.

[0017] D. A rotary drive mechanism drives a fixed shaft to rotate so that the stacked positive electrode, separator and negative electrode are wound to form a battery cell;

[0018] E. Cut the end of the battery cell and then unload the battery cell.

[0019] Furthermore, the clamping by the clamping module specifically includes:

[0020] C1. The electromagnetic structure is powered by an electric slip ring, and the electromagnetic structure magnetizes the fixed part;

[0021] C2. The fixed part magnetically attracts the movable part, so that the movable part cooperates with the fixed part to clamp the positive electrode, the separator and the negative electrode;

[0022] C3. Sensing changes in pressure on the fixing component and adjusting the current of the electromagnetic structure according to the pressure changes.

[0023] Furthermore, step D specifically includes:

[0024] D1. The rotation drive mechanism drives the fixed shaft to rotate at a first speed to achieve winding, while the monitor monitors the number of rotations of the fixed shaft;

[0025] D2. When the number of rotations of the fixed shaft reaches the preset number of rotations, the rotation drive mechanism drives the fixed shaft to rotate at the second speed until the number of rotations of the fixed shaft reaches the target number of rotations;

[0026] D3. The rotation drive mechanism drives the fixed shaft to rotate to the initial position based on the data fed back by the monitor;

[0027] The first speed is greater than the second speed, and the difference between the number of laps achieved and the preset number of laps is 1-5 laps.

[0028] Furthermore, in step D2, the fixed shaft is uniformly reduced from the first speed to the second speed within 1-5 seconds, while the unwinding rate and tension of the unwinding unit are adjusted.

[0029] Step D4 is followed by step D5. The fixed shaft is driven to rotate a distance S by a rotation drive mechanism so that the stacked positive electrode, separator and negative electrode do not come into contact with the fixed part and the moving part.

[0030] The maximum distance between the fixed part and the moving part is H, and S:H = 1:2-1:3.

[0031] Furthermore, step E specifically includes:

[0032] E1. The feeding and conveying mechanism drives the pressing mechanism to move to the battery cell, where the pressing mechanism presses the end of the battery cell.

[0033] E2. When the electromagnetic structure is de-energized, the moving parts move away from the fixed parts under the action of gravity and springs to release the positive electrode, diaphragm and negative electrode.

[0034] E3. The cutting mechanism operates to cut off the end of the battery cell and clamp the cut positive electrode, separator, and negative electrode.

[0035] E4. The adhesive application mechanism applies adhesive tape to the end of the battery cell;

[0036] E5. The pressing mechanism switches to a negative pressure state to adsorb the battery cell using negative pressure; then the unloading and conveying mechanism moves to control the pressing mechanism to drive the battery cell away from the fixed shaft;

[0037] The order of steps E2 and E3 is not important.

[0038] The beneficial effects of the present invention are as follows: The present invention provides a notch on a fixed shaft to accommodate the first end of the structure after the positive electrode, separator and negative electrode are stacked, and clamps it with a clamping module. The structure is simple and does not require much space, and can reliably extract cells from small lithium batteries. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of Example 1.

[0040] Figure 2 This is a schematic diagram of the fixed shaft in Example 1.

[0041] Figure 3 for Figure 2 The internal view at point A.

[0042] Figure 4 This is a schematic diagram of the feeding unit in Example 1.

[0043] Figure 5 This is a flowchart of Example 2.

[0044] Reference numerals: 1—Unwinding unit, 2—Leveling unit, 3—Tearing film unit, 4—Winding unit, 5—Unloading unit, 6—Positive electrode sheet, 7—Separator, 8—Negative electrode sheet, 21—Leveling drive module, 22—Support roller, 23—Pressure roller, 41—Layering mechanism, 42—Fixed shaft, 43—Rotation drive mechanism, 44—Cutting mechanism, 45—Notch, 46—Clamping module, 47—Sensor, 48—Welding mechanism, 51—Unloading and conveying mechanism, 52—Pressure mechanism, 53—Adhesive application mechanism, 54—Suction cup, 461—Moving part, 462—Fixed part, 463—Electromagnetic structure, 464—Magnetized column, 465—Electrical slip ring, 466—Guide column, 467—Guide hole, 468—Spring. Detailed Implementation

[0045] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0046] Example 1

[0047] like Figures 1 to 4 As shown, this embodiment of a lithium battery winding system includes an unwinding unit 1, a leveling unit 2, a film-tearing unit 3, a winding unit 4, and a cutting unit 5. The unwinding unit 1 is used to unwind various film materials, the leveling unit 2 is used to level the various film materials respectively, the film-tearing unit 3 is used to peel off the release paper from the leveled film materials, the winding unit 4 is used to stack and wind the various film materials to form a battery cell, and the cutting unit 5 is used to remove the battery cell from the winding unit 4. The film materials include a positive electrode sheet 6, a separator 7, and a negative electrode sheet 8.

[0048] Specifically, the unwinding unit 1 includes multiple unwinding mechanisms, which can adopt conventional schemes, with the purpose of releasing the positive electrode 6, the separator 7 and the negative electrode 8 respectively.

[0049] The leveling unit 2 includes multiple leveling mechanisms, each including a leveling drive module 21, a support roller 22, and a pressure roller 23. A gap is formed between the support roller 22 and the pressure roller 23 to allow the positive electrode 6 / diaphragm 7 / negative electrode 8 to pass through. The leveling drive module 21 drives the support roller 22 and / or the pressure roller 23 to rotate, thereby achieving the effects of traction and flattening of the film material. This straightens the film material with a certain degree of curvature released from the winding point, ensuring that the three types of film materials can be tightly bonded during subsequent stacking.

[0050] The film-peeling unit 3 peels the film after it has been flattened. This peeling mainly involves removing the release film from the surface of the film. For example, the positive electrode 6 and negative electrode 8 have release films attached to the ends with the coating, while the separator 7 does not. Therefore, only the positive electrode 6 and negative electrode 8 need to be peeled. Setting the peeling action after flattening is mainly to prevent the pressure roller 23 / support roller 22 from contacting the coating, ensuring that the coating layer is not damaged.

[0051] The winding unit 4 includes a film stacking mechanism 41, a fixed shaft 42, a rotation drive mechanism 43, and a cutting mechanism 44. The film stacking mechanism 41 is used to force multiple film materials to be stacked sequentially. The rotation drive mechanism 43 is used to drive the fixed shaft 42 to rotate. The cutting mechanism 44 is used to cut the connection between the film material and the battery cell. One side of the fixed shaft 42 has a notch 45 for accommodating the stacked film materials. A clamping module 46 is provided in the notch 45. The clamping module 46 is used to clamp the film material that is inserted into the notch 45.

[0052] The winding unit 4 also includes conventional structures such as a tension adjustment mechanism and a correction mechanism. After the film material has been leveled and the release film has been torn, the tension is adjusted and the deviation is corrected before it is fed into the lamination mechanism 41 for lamination. The three materials are stacked in sequence before entering the fixed shaft 42. Specifically, the lamination mechanism 41 preferably has two rollers. The three types of film material after deviation correction are placed between the two rollers to accurately complete the lamination operation.

[0053] In actual use, the rotating drive mechanism 43 preferably uses a conventional structure with a motor as the drive source. After the three types of film materials are stacked, they are inserted into the notch 45, and then the film materials are clamped by the clamping module 46. This allows the first end of the stacked structure to start winding without loosening or separating, ensuring the quality and effect of winding.

[0054] In this embodiment, the clamping module 46 includes a movable part 461, a fixed part 462, and an electromagnetic structure 463. The fixed part 462 is installed on the inner top wall of the notch 45, the movable part 461 is movably disposed on the inner bottom wall of the notch 45, and the driver is installed in the fixed shaft 42. The driver is used to drive the movable part 461 to move closer to or away from the fixed part 462.

[0055] Both the movable part 461 and the fixed part 462 are made of magnetizable metal. The electromagnetic structure 463 is used to magnetize the fixed part 462 when energized so that the fixed part 462 magnetically attracts the movable part 461. The clamping of the film material can be achieved by using the cooperation of the movable part 461 and the fixed part 462.

[0056] Specifically, the electromagnetic structure 463 is mainly used to magnetize the fixing member 462. When the fixing member 462 is magnetic, it will inevitably magnetically attract the movable member 461 with barbed properties, thereby stably adsorbing the movable member 461 and allowing the movable member 461 to cooperate with the fixing member 462 to clamp the film material. Since the clamping of this invention is all set in a fixed shaft 42, the required space is small, and the determining factor of the magnetic force is mainly the current value. When the current value reaches the required value, the fixed shaft 42 will not loosen the fixing member 462 and the movable member 461 even when rotating at high speed.

[0057] Specifically, the fixed member 462 has multiple magnetized posts 464 at one end opposite to the movable member 461, and the electromagnetic structure 463 includes multiple coils, which are wound around the magnetized posts 464 in a one-to-one correspondence. The fixed shaft 42 has an electric slip ring 465, and the coils are electrically connected to the electric slip ring 465. The movable member 461 has several guide posts 466 at one end opposite to the fixed member 462, and the bottom of the notch 45 has several guide holes 467, which are movably arranged in a one-to-one correspondence with the guide posts 466. The guide posts 466 are wound with springs 468, which are used to force the movable member 461 to move in the direction of the fixed member 462. The bottom of the guide posts 466 is provided with a limiting member, which is used to prevent the guide posts 466 from disengaging from the guide holes 467.

[0058] By using the magnetized pillars 464 and the coil to form an electromagnet structure, the fixed part 462 can be effectively magnetized. The number of magnetized pillars 464 needs to be calculated according to the principle of magnetic field superposition. This ensures that the magnetic field of the magnetized pillars 464 is basically the same at different positions, further making the clamping force between the fixed part 462 and the movable part 461 uniform, resulting in a better clamping effect.

[0059] The spring 468 is designed to force the movable part 461 to always have a tendency to move away from the fixed part 462, so as to ensure that the movable part 461 can effectively and reliably detach from the fixed part 462 when the coil is de-energized.

[0060] Since the fixed shaft 42 needs to rotate, the present invention utilizes an electric slip ring 465 to connect the coil to the outside world. The coil can also be connected to the outside world through a wire. The structure formed by the wire and the electric slip ring 465 can ensure that the wire will not get tangled when the fixed shaft 42 rotates and that it will remain connected to the outside world.

[0061] In this embodiment, the winding unit 4 further includes a sensor 47 and a welding mechanism 48. The sensor 47 is used to sense the number of rotations of the fixed shaft 42 and its current posture. The sensor 47 is signal-connected to the rotation drive mechanism 43. The welding mechanism 48 is used to weld the electrode sheet to the corresponding film material.

[0062] The sensor 47 is preferably a Hall element or a proximity switch, etc. Using the sensor 47 to obtain the number of rotations of the fixed shaft 42 helps to ensure that the specifications of the battery cells are consistent each time they are wound. Using the sensor 47 to obtain the specific posture of the fixed shaft 42 helps to accurately place the film material into the notch 45 later.

[0063] The welding mechanism 48 welds the corresponding electrodes to the positive electrode 6 / negative electrode 8. This welding can be performed at a specific position before winding, so that the electrodes move as the winding is completed.

[0064] In this embodiment, the feeding unit 5 includes a feeding and conveying mechanism 51, a pressing mechanism 52, and an adhesive applicator 53. The pressing mechanism 52 is used to press the battery cell to maintain its shape. The adhesive applicator 53 is used to apply adhesive tape to the end of the battery cell after the cutting mechanism 44 cuts the material. The pressing mechanism 52 has a suction cup 54 for picking up the battery cell. The feeding and conveying mechanism 51 is used to drive the pressing mechanism 52 to move horizontally and move vertically.

[0065] The unloading and conveying mechanism 51 is preferably a three-axis drive module, or a robot with more axes may also be used. The pressing mechanism 52 uses a suction cup 54 to press the battery cell to the outside, thereby generating a pressing force, which facilitates the cutting mechanism 44 to cut and separate the battery cell from the stacked positive electrode 6, separator 7, and negative electrode 8. After the cutting is completed, the adhesive applicator 53 first applies adhesive tape to the cut part of the battery cell, so that the structure of the battery cell is fixed. Then, the suction cup 54 picks up the battery cell by negative pressure, which achieves the effect of gripping the battery cell and removing it.

[0066] Example 2

[0067] like Figure 5As shown, this embodiment provides a process for applying the lithium battery winding system described in Embodiment 1, including the following steps:

[0068] A. The positive electrode 6, the separator 7, and the negative electrode 8 are unwound through the unwinding unit 1;

[0069] B. The positive electrode 6, the separator 7, and the negative electrode 8 are leveled respectively;

[0070] C. After the positive electrode 6, the separator 7 and the negative electrode 8 are stacked in sequence, they are transferred to the notch 45 of the fixed shaft 42 and clamped by the clamping module 46.

[0071] D. The rotation drive mechanism 43 drives the fixed shaft 42 to rotate so that the stacked positive electrode 6, separator 7 and negative electrode 8 are wound to form a battery cell.

[0072] E. Cut the end of the battery cell and then unload the battery cell.

[0073] Based on the system of Example 1, this example realizes the single-axis completion of winding of lithium battery cores.

[0074] In this embodiment, the clamping by the clamping module 46 specifically includes:

[0075] C1. The electromagnetic structure 463 is powered by the slip ring 465, and the electromagnetic structure 463 magnetizes the fixing part 462.

[0076] C2. The fixing part 462 magnetically attracts the movable part 461, so that the movable part 461 and the fixing part 462 cooperate to clamp the positive electrode 6, the separator 7 and the negative electrode 8.

[0077] C3. Sensing the pressure change on the fixing member 462, and adjusting the current of the electromagnetic structure 463 according to the pressure change.

[0078] Due to manufacturing process limitations, the dimensions of the membrane material inevitably have a certain degree of error. When the errors of the positive electrode 6, separator 7, and negative electrode 8 are added together, the range of this error is further amplified. Based on this phenomenon, this invention adds a pressure sensor to Example 1. The pressure sensor provides feedback on the clamping force value, and the current value is adjusted according to this clamping force value, causing a change in the magnetic field strength, thus achieving the effect of adjusting the clamping force.

[0079] The adjustable clamping force ensures that the clamping force value is always suitable, which not only ensures stable clamping, but also avoids damage to the positive electrode 6 / separator 7 / negative electrode 8.

[0080] In this embodiment, step D specifically includes:

[0081] D1. The rotation drive mechanism 43 drives the fixed shaft 42 to rotate at a first speed to achieve winding, while the monitor monitors the number of rotations of the fixed shaft 42.

[0082] D2. When the number of rotations of the fixed shaft 42 reaches the preset number of rotations, the rotation drive mechanism 43 drives the fixed shaft 42 to rotate at the second speed until the number of rotations of the fixed shaft 42 reaches the target number of rotations;

[0083] D3. The rotation drive mechanism 43 drives the fixed shaft 42 to rotate to the initial posture based on the data fed back by the monitor;

[0084] The first speed is greater than the second speed, and the difference between the number of laps achieved and the preset number of laps is 1-5 laps.

[0085] Generally speaking, the first speed is the fast winding speed, and the second speed is the slow winding speed. The reason for setting these two speeds is that the first speed ensures winding efficiency, while the second speed ensures winding accuracy and the final position of the notch 45, thereby ensuring the stability of the cell specifications in this embodiment.

[0086] Similarly, since the second speed is slower, the posture of the fixed shaft 42 after winding can be guaranteed, so that the position of the notch 45 does not need to be specially adjusted before the cell is removed and the film material is put back into the notch 45, which further improves the smoothness of the process.

[0087] Specifically, in step D2, the fixed shaft 42 decreases uniformly from the first speed to the second speed within 1-5 seconds, while the unwinding rate and tension of the unwinding unit 1 are adjusted.

[0088] In other words, the descent from the first speed to the second speed is essentially uniform, ensuring that the traction force and tension adjustment of the membrane material change uniformly with the speed change. This avoids severe stretching of the membrane material due to sudden speed changes, thus ensuring the quality of the battery cell. Typically, the value of the second speed is small, so the decrease from the second speed to zero speed can be abrupt without causing excessive stretching of the membrane material.

[0089] Specifically, after step D4, step D5 is also included. The fixed shaft 42 is driven to rotate a distance S by the rotation drive mechanism 43, so that the stacked positive electrode 6, diaphragm 7 and negative electrode 8 do not contact the fixed part 462 and the moving part 461.

[0090] The maximum distance between the fixed part 462 and the movable part 461 is H, and S:H = 1:2-1:3.

[0091] This position is for fine-tuning. When the fixing part 462 and the moving part 461 are loosened, the stacked membrane material may still be in contact with the fixing part 462. At this time, a small rotation will not affect the change of the battery cell specifications, and can also ensure that the stacked structure of the positive electrode 6, separator 7 and negative electrode 8 in the notch 45 is separated from the fixing part 462 and does not contact the moving part 461, thereby minimizing the contact area between the battery cell and the fixed shaft 42 and achieving the effect of reducing friction.

[0092] In this embodiment, step E specifically includes:

[0093] E1. The feeding and conveying mechanism 51 drives the pressing mechanism 52 to move to the battery cell, where the pressing mechanism 52 presses the end of the battery cell.

[0094] E2. When the electromagnetic structure 463 is de-energized, the movable part 461 moves away from the fixed part 462 under the action of gravity and spring 468, so as to release the positive electrode 6, the diaphragm 7 and the negative electrode 8.

[0095] E3. The cutting mechanism 44 operates to cut off the end of the battery cell and clamp the cut positive electrode 6, separator 7 and negative electrode 8.

[0096] E4. Adhesive application mechanism 53 applies adhesive tape to the end positions of the battery cells;

[0097] E5. The pressing mechanism 52 switches to a negative pressure state and uses negative pressure to adsorb the battery cell; then the unloading and conveying mechanism 51 moves to control the pressing mechanism 52 to drive the battery cell away from the fixed shaft 42.

[0098] The order of steps E2 and E3 is not important.

[0099] That is, after the winding is completed, the pressing mechanism 52 needs to press the battery cell before controlling the electromagnetic structure 463 to cut off the power, so as to ensure that the fixed part 462 and the moving part 461 are released only after the battery cell structure is stable. The suction cup 54 of the pressing mechanism 52 does not generate negative pressure when pressing the battery cell. At this time, it only maintains the pressing action to avoid the tight structure of the battery cell being loosened due to suction. Only after the adhesive is applied will the pressing mechanism use negative pressure to suck up the battery cell, and then take the battery cell away from the fixed shaft 42 and transfer it to the unloading.

[0100] The process described in this embodiment enables single-axis clamping and winding of the film material, and allows the battery cell to smoothly detach from the fixed shaft 42 after winding without causing a core-pulling effect.

[0101] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A lithium battery winding system, comprising an unwinding unit, a leveling unit, a film-peeling unit, a winding unit, and a cutting unit, wherein the unwinding unit is used to unwind multiple film materials, the leveling unit is used to level the multiple film materials respectively, the film-peeling unit is used to peel off the release paper from the leveled film materials, the winding unit is used to stack and wind the multiple film materials to form a battery cell, and the cutting unit is used to remove the battery cell from the winding unit, characterized in that... The winding unit includes a film stacking mechanism, a fixed shaft, a rotation drive mechanism, and a cutting mechanism. The film stacking mechanism is used to force multiple film materials to be stacked sequentially. The rotation drive mechanism is used to drive the fixed shaft to rotate. The cutting mechanism is used to cut the connection between the film material and the battery cell. One side of the fixed shaft has a notch for accommodating the stacked film materials, and a clamping module is provided in the notch. The clamping module is used to clamp the film material stacked inside the insertion notch; The clamping module includes a movable component, a fixed component, and an electromagnetic structure. The fixed component is installed on the inner top wall of the notch, the movable component is movably disposed on the inner bottom wall of the notch, and the driver is installed inside the fixed shaft. The driver is used to drive the movable component to move closer to or away from the fixed component. Both the moving and fixed parts are made of magnetizable metal. The electromagnetic structure is used to magnetize the fixed part when energized so that the fixed part magnetically attracts the moving part. It also includes the following steps: A. The positive electrode sheet, separator, and negative electrode sheet are unwound and wound through the unwinding unit; B. Level the positive electrode, separator, and negative electrode respectively; C. After stacking the positive electrode, separator, and negative electrode in sequence, the plates are transferred to the notch of the fixed shaft and clamped by the clamping module. D. A rotary drive mechanism drives a fixed shaft to rotate so that the stacked positive electrode, separator and negative electrode are wound to form a battery cell; E. Cut the end of the battery cell and then unload the battery cell; The clamping by the clamping module specifically includes: C1. The electromagnetic structure is powered by an electric slip ring, and the electromagnetic structure magnetizes the fixed part; C2. The fixed part magnetically attracts the movable part, so that the movable part cooperates with the fixed part to clamp the positive electrode, the separator and the negative electrode; C3. Sensing changes in pressure on the fixing component and adjusting the current of the electromagnetic structure according to the pressure changes.

2. The lithium battery winding system according to claim 1, characterized in that, The fixed component has multiple magnetized posts at its opposite end to the movable component. The electromagnetic structure includes multiple coils, each coil being wound around a corresponding magnetized post. An electric slip ring is provided inside the fixed shaft, and the coils and the slip ring are electrically connected. The movable component has several guide posts at its opposite end to the fixed component. Several guide holes are provided at the bottom of the notch, each guide hole being movably connected to a corresponding guide post. Springs are wound around the guide posts, and the springs are used to force the movable component to move in the direction of the fixed component. A limiter is provided at the bottom of the guide post to prevent the guide post from disengaging from the guide hole.

3. The lithium battery winding system according to claim 1, characterized in that, The winding unit also includes a sensor and a welding mechanism. The sensor is used to sense the number of rotations of the fixed shaft and its current posture. The sensor is signal-connected to the rotation drive mechanism. The welding mechanism is used to weld the electrode sheet to the corresponding film material.

4. The lithium battery winding system according to claim 1, characterized in that, The unloading unit includes an unloading and conveying mechanism, a pressing mechanism, and an adhesive applicator. The pressing mechanism is used to press the battery cell to maintain its shape. The adhesive applicator is used to apply adhesive tape to the end of the battery cell after it has been cut by the cutting mechanism. The pressing mechanism has a suction cup for picking up the battery cell. The unloading and conveying mechanism is used to drive the pressing mechanism to move horizontally and move vertically.

5. A process for using the lithium battery winding system according to any one of claims 1-4, characterized in that, Includes the following steps: A. The positive electrode sheet, separator, and negative electrode sheet are unwound and wound through the unwinding unit; B. Level the positive electrode, separator, and negative electrode respectively; C. After stacking the positive electrode, separator, and negative electrode in sequence, the plates are transferred to the notch of the fixed shaft and clamped by the clamping module. D. A rotary drive mechanism drives a fixed shaft to rotate so that the stacked positive electrode, separator and negative electrode are wound to form a battery cell; E. Cut the end of the battery cell and then unload the battery cell; The clamping by the clamping module specifically includes: C1. The electromagnetic structure is powered by an electric slip ring, and the electromagnetic structure magnetizes the fixed part; C2. The fixed part magnetically attracts the movable part, so that the movable part cooperates with the fixed part to clamp the positive electrode, the separator and the negative electrode; C3. Sensing changes in pressure on the fixing component and adjusting the current of the electromagnetic structure according to the pressure changes.

6. The process according to claim 5, characterized in that, Step D specifically includes: D1. The rotation drive mechanism drives the fixed shaft to rotate at a first speed to achieve winding, while the monitor monitors the number of rotations of the fixed shaft. D2. When the number of rotations of the fixed shaft reaches the preset number of rotations, the rotation drive mechanism drives the fixed shaft to rotate at the second speed until the number of rotations of the fixed shaft reaches the target number of rotations; D3. The rotation drive mechanism drives the fixed shaft to rotate to the initial position based on the data fed back by the monitor; The first speed is greater than the second speed, and the difference between the number of laps achieved and the preset number of laps is 1-5 laps.

7. The process according to claim 6, characterized in that, In step D2, the fixed shaft is uniformly reduced from the first speed to the second speed within 1-5 seconds, while the unwinding rate and tension of the unwinding unit are adjusted. After step D4, step D5 is also included. The fixed shaft is driven to rotate a distance S by a rotation drive mechanism so that the stacked positive electrode, separator and negative electrode do not come into contact with the fixed part and the moving part. The maximum distance between the fixed part and the moving part is H, and S:H = 1:2-1:

3.

8. The process according to claim 5, characterized in that, Step E specifically includes: E1. The feeding and conveying mechanism drives the pressing mechanism to move to the battery cell, where the pressing mechanism presses the end of the battery cell. E2. When the electromagnetic structure is de-energized, the moving parts move away from the fixed parts under the action of gravity and springs to release the positive electrode, diaphragm and negative electrode. E3. The cutting mechanism operates to cut off the end of the battery cell and clamp the cut positive electrode, separator, and negative electrode. E4. The adhesive application mechanism applies adhesive tape to the end of the battery cell; E5. The pressing mechanism switches to a negative pressure state to adsorb the battery cell using negative pressure; then the unloading and conveying mechanism moves to control the pressing mechanism to drive the battery cell away from the fixed shaft; The order of steps E2 and E3 is not important.

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