An automatic wrapping machine for assembling a pole group and a working method thereof

Abstract

The application discloses an automatic film wrapping machine for pole group assembly and a working method thereof, and belongs to the field of storage battery production. The film wrapping machine comprises a film wrapping device, the film wrapping device comprises a rack, the rack is rotationally connected with a barrel, a plurality of pole group channels arranged along a radial direction are arranged in the barrel, and suction holes are uniformly arranged on the circumferential surface of the barrel; the inside of the barrel is communicated with a negative pressure device through a pipeline, a film is adsorbed through the suction holes, the film is attached to the outer wall of the barrel, and the pole group is pushed into the pole group channel through a pushing assembly, so that the film is wrapped outside the pole group. Through rotation of the barrel, the film is attached to the outer wall of the barrel by negative pressure adsorption, so that the film can be pulled out by rotation of the barrel, the process that a clamping assembly needs to reciprocate to pull out the film in the existing film wrapping equipment is reduced, the waiting time of the equipment is effectively reduced, the working hours of the whole film wrapping process are effectively reduced, and the overall production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, and in particular to an automatic chip wrapping machine for electrode assembly and its working method. Background Technology

[0002] During the battery production process, the interior is filled with electrode groups assembled from positive plates, negative plates, and separator paper. After the positive and negative plates are covered with separator paper, they are stacked in an orderly manner to form electrode groups. Electrode groups of corresponding specifications enter the fixture of the pre-sinking machine through a designated conveying channel. The side cylinders of the pre-sinking fixture are activated to clamp the electrode groups and compress them to a specified thickness. Finally, the pre-sinking operation is completed by pre-sinking the electrode groups into the grooves of the battery casing.

[0003] However, during the pre-slotting process of existing electrode groups, the electrode plates may scrape against the pre-slotting fixture and the slot opening of the battery casing, causing the lead paste on the electrode plates to fall off. In severe cases, if the lead paste falls into the battery casing, it can cause a short circuit between the positive and negative electrode plates. The current conventional practice is that after the positive electrode sheet, insulating separator, and negative electrode sheet are assembled into an electrode group by a battery electrode group wrapping machine, a coating treatment is required on the outside of the electrode group. By wrapping the electrode group with a thin film, the electrode group is protected, thereby avoiding direct scratching of the electrode plate surface and the lead paste falling off.

[0004] In the existing coating process, after one coating is completed, the film needs to be cut, and then a certain length of film is pulled out by the reciprocating motion of the clamping component to carry out the next coating operation, so as to achieve continuous operation.

[0005] However, the existing wrapping process requires waiting for the film to be pulled out before the film can be processed. During this process, the clamping and conveying of the film take time, resulting in a long overall wrapping time and low overall production efficiency. Summary of the Invention

[0006] This invention provides an automatic wafer wrapping machine for electrode assembly, which can solve the problems of long working time and low overall production efficiency in the existing coating process.

[0007] An automatic coating machine for electrode assembly includes: an electrode feeding conveyor line, an electrode unloading conveyor line, and a pushing assembly. A coating device is provided between the electrode feeding conveyor line and the electrode unloading conveyor line. The coating device includes a frame, a cylinder rotatably connected to the frame, a driving device for driving the cylinder to rotate fixedly connected, and a cutting assembly for cutting the film fixedly connected. The cylinder is sealed at both ends and has a plurality of radially arranged electrode channels inside, which penetrate the circumferential surface of the cylinder. Adsorption holes are evenly distributed on the circumferential surface of the cylinder. The inside of the cylinder is connected to a negative pressure device through a pipe for adsorbing the film through the adsorption holes, so that the film adheres to the outer wall of the cylinder. During the process of pushing the electrode into the electrode channels by the pushing assembly, the film covers the outside of the electrode, and the electrode covered with film enters the electrode unloading conveyor line through the electrode channels. As a preferred embodiment of the present invention, the cylinder includes two end walls, one end wall being fixedly connected to the cylinder wall and rotatably connected to the frame; the other end wall being rotatably connected to the cylinder wall and fixedly connected to the frame, and this end wall being fixedly connected to a pipe interface communicating with a negative pressure device.

[0008] As a preferred embodiment of the present invention, the plurality of polar channels divide the inner wall of the cylinder into independent sector-shaped cavities, which are used to enable the adsorption pores in the corresponding areas to adsorb the film when the sector-shaped cavities are connected to the pipe interface during the rotation of the cylinder. Furthermore, during the rotation of the cylinder, the sector-shaped cavities that do not participate in the adsorption of the film are not connected to the pipe interface.

[0009] As a preferred embodiment of the present invention, a clearance opening is provided at the intersection of several pole group channels, and a guide roller is rotatably connected to each clearance opening to guide the pole group and avoid jamming at the intersection of pole group channels.

[0010] As a preferred embodiment of the present invention, a partition is fixedly connected to the inner wall of the sector-shaped cavity. The partition is used to separate the sector-shaped cavity into an independent negative pressure cavity, and during the rotation of the cylinder, only the negative pressure cavity is connected to the pipe interface.

[0011] As a preferred embodiment of the present invention, the cutting assembly includes a telescopic device fixedly connected to the frame, and a cutter is fixedly connected to the telescopic end of the telescopic device.

[0012] As a preferred embodiment of the present invention, the circumferential surface of the cylinder is provided with an axially arranged groove, the groove being located between any two adjacent pole group channel ports, and a pad is installed in the groove, which is used to contact the cutter when the cutting assembly cuts the film.

[0013] As a preferred embodiment of the present invention, the frame is fixedly connected with a guide tube, and the end of the guide tube facing the pusher assembly has a flared structure for guiding the electrode group so that the electrode group corresponds to the electrode group channel position.

[0014] As a preferred embodiment of the present invention, the frame is rotatably connected with a support roller for mounting the film roll and a plurality of pressure rollers for pressing the film tightly against the outer wall of the cylinder, and at least two pressure rollers are symmetrically arranged relative to the guide tube opening.

[0015] A method for operating an automatic die-packing machine for electrode group assembly, applied to the automatic die-packing machine for electrode group assembly as described above, specifically includes the following steps: Step 1: Take the membrane. Drive the cylinder to rotate using the drive device. Adsorb the membrane using the adsorption holes. During the rotation of the cylinder, the membrane adheres to the outer wall of the cylinder and covers the port of one of the electrode channels. Step 2: Cut the film. Rotate the cylinder to a position where the pole group channel covered by the film at the port is in a horizontal state. Cut the film attached to the outer wall of the cylinder using the cutting component. The two ends of the cut film are symmetrical with respect to the port of the pole group channel. Step 3: Feeding and wrapping. The feeding assembly pushes the electrode group on the feeding conveyor line into the electrode group channel, and the cut film is wrapped around the outside of the electrode group during the pushing process. Step 4: Unloading. The pusher component pushes the electrode group out from the port at the other end of the electrode group channel and pushes it to the electrode group unloading conveyor line to realize unloading.

[0016] The present invention has the following beneficial effects: 1. This invention utilizes the rotation of the cylinder and negative pressure adsorption to adhere the film to the outer wall of the cylinder. The film can then be pulled out by rotating the cylinder, reducing the need for the clamping components to reciprocate in existing wrapping equipment. This effectively reduces the waiting time of the equipment and thus the overall working time of the wrapping process, thereby improving overall production efficiency.

[0017] 2. This invention divides the inner wall of the cylinder into independent sector-shaped cavities through a series of channels. During the rotation of the cylinder, when a sector-shaped cavity is connected to the pipe interface, the adsorption pores in the corresponding area can adsorb the film. During the rotation of the cylinder, the sector-shaped cavities that do not participate in the film adsorption are not connected to the pipe interface, thereby enabling the adsorption pores that adsorb the film to obtain a large suction force, ensuring the adsorption effect of the film, and ensuring the overall reliability and stability of use. Attached Figure Description

[0018] Figure 1 This invention provides a structural schematic diagram of an automatic chip wrapping machine for electrode group assembly; Figure 2 for Figure 1 A structural diagram from another perspective; Figure 3 for Figure 1 The front view; Figure 4 This is a structural diagram of the frame and cylinder; Figure 5 for Figure 4 A structural diagram from a rear-view perspective; Figure 6 for Figure 4 The front view; Figure 7 for Figure 6 Sectional view at point AA; Figure 8 A schematic diagram of the structure when the film is applied to the cylinder; Figure 9 This is a schematic diagram of the internal structure of the cylinder; Figure 10 This is a schematic diagram of the end wall structure; Figure 11 for Figure 7 The front view; Figure 12 for Figure 11 Schematic diagram of the structure during encapsulation; Figure 13 for Figure 12 A magnified schematic diagram of the structure of B in the middle. Explanation of reference numerals in the attached figures: 1-Pole group feeding conveyor line, 2-Pole group unloading conveyor line, 3-Pushing assembly, 4-Cylinder, 10-Frame, 20-Film, 101-Drive device, 102-Telescopic device, 103-Cutter, 104-Guide pipe opening, 105-Pressure roller, 401-Pole group channel, 402-Adsorption hole, 403-End wall, 404-Pipe interface, 405-Fan-shaped cavity, 406-Guide roller, 407-Partition plate, 408-Negative pressure chamber, 409-Pad plate. Detailed Implementation

[0019] Example 1 The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0020] After the battery electrode group is covered with separator paper, a protective film needs to be wrapped around the outside of the electrode group to prevent direct scratching between the electrode plates and the clamps or plastic casing grooves during the subsequent pre-grooving process, which could cause lead paste to fall off. In the existing electrode group wrapping process, a clamping assembly is used to hold the end of the film and reciprocate to pull out a set length of film from the film roll for the next wrapping. In this working mode, after one wrapping is completed, the machine needs to wait for the clamping assembly to pull the film into place. This waiting time is non-productive, resulting in an excessively long overall cycle time for the wrapping process and limiting the improvement of production efficiency.

[0021] like Figures 1 to 3 As shown, to solve the above problems, this invention proposes an automatic wafer wrapping machine for electrode assembly, which can perform continuous and efficient wrapping. Specifically, it includes: an electrode loading conveyor line 1, an electrode unloading conveyor line 2, and a pushing assembly 3, with a wrapping device disposed between the electrode loading conveyor line 1 and the electrode unloading conveyor line 2.

[0022] The electrode loading conveyor line 1 and the electrode unloading conveyor line 2 can refer to the existing technology for conveying electrode groups. The former is used to continuously convey the electrode groups to be coated to the loading station in front of the pushing component 3, and the latter is used to receive the coated electrode groups and convey them to the subsequent pre-groove process.

[0023] The pushing assembly 3 can be driven by a cylinder, hydraulic cylinder or electric push rod. Its front end is connected to a push plate or push block that matches the shape of the electrode group. It is used to push the electrode group from the electrode group feeding conveyor line 1 into the coating device during the coating process, and push the electrode group from the coating device to the electrode group unloading conveyor line 2 after the coating is completed.

[0024] like Figures 4 to 6 As shown, a cylinder 4 is rotatably connected to the frame 10 via bearings. The cylinder 4 is a cylindrical hollow structure with sealed ends. Inside, there are several radially arranged pole group channels 401 that penetrate the circumference of the cylinder 4. Taking the structure in the attached figure as an example, there are two pole group channels 401, which intersect in a cross shape and are connected at the intersection.

[0025] A drive unit 101 is fixedly mounted on the frame 10. The drive unit 101 can be a servo motor or a stepper motor, and its output end is connected to the cylinder 4 via a gear pair, sprocket pair, or synchronous belt mechanism to drive the cylinder 4 to rotate precisely around its central axis. A support roller is mounted on the frame 10 for mounting the film roll and releasing the film. A cutting assembly is also fixedly mounted on the frame 10 for cutting the film after it has been applied in place.

[0026] like Figures 7 to 9As shown, a plurality of adsorption holes 402 are evenly distributed on the circumferential surface (i.e., the outer cylindrical wall) of the cylinder 4. The adsorption holes 402 penetrate the cylinder wall and connect the outside of the cylinder 4 with the internal cavity. The internal cavity of the cylinder 4 is connected to an external negative pressure device through a pipe. The negative pressure device can be a negative pressure fan or a vacuum pump.

[0027] When the negative pressure device is activated, a negative pressure is generated inside the cylinder 4, and external air is drawn into the cylinder 4 through the adsorption hole 402, thereby generating an adsorption force at the port of the adsorption hole 402. This adsorption force can adsorb the film drawn out of the film roll and make it adhere tightly to the outer wall of the cylinder 4. As the cylinder 4 rotates, the film is continuously pulled out and wrapped around part of the outer circumference of the cylinder 4 until it covers the port of one of the pole group channels 401.

[0028] like Figures 11 to 13 As shown, the pushing assembly 3 then pushes the electrode group to be coated into the electrode group channel 401 from the electrode group loading conveyor line 1. As the electrode group passes through the electrode group channel 401, the film attached to the outer wall of the cylinder 4 enters the channel along with the electrode group and is coated on the outside of the electrode group. The coated electrode group is then pushed out from the other end of the electrode group channel 401 and enters the electrode group unloading conveyor line 2, completing one automatic coating operation.

[0029] It should be emphasized that the core improvement of this embodiment lies in replacing the traditional clamping and stretching mechanism with a rotating cylinder 4 to achieve film delivery and pre-spreading. When the cylinder 4 rotates under the drive of the drive device 101, the adsorption holes 402 on its outer wall adsorb the film under negative pressure and adhere it to the outer circumference of the cylinder 4. The arc length through which the cylinder 4 rotates is the length of the film pulled out.

[0030] This solution combines the film pulling action with the rotation of the cylinder 4 itself using a "rotational film picking" method, eliminating the need for a separate clamping assembly for reciprocating film pulling motion. After one film coating is completed, the cylinder 4 can immediately begin the next film picking rotation. The pusher assembly 3 pushes out the coated electrode group and immediately prepares for the next push. The connection between each action is more compact, significantly reducing the waiting time for film pulling and clamping, thereby effectively shortening the overall working time of the coating process and improving production efficiency.

[0031] Example 2 Based on Embodiment 1, since the cylinder 4 needs to be able to rotate and also needs to be connected to the external negative pressure device through pipes, this brings difficulties to the connection between pipes. Therefore, the structure of the cylinder 4 needs to be further optimized.

[0032] like Figures 8 to 10As shown, the cylinder 4 includes two end walls 403. One end wall 403 is an independent integral disc structure, which is fixedly connected to the cylinder wall of the cylinder 4 by welding or bolts. The center or edge of this end wall 403 is rotatably connected to the frame 10 via bearings. The rotational motion output by the drive device 101 is transmitted to the fixed end wall 403 or the journal fixed thereto through a gear mechanism or coupling, thereby driving the entire cylinder 4 to rotate.

[0033] The other end wall 403 differs in that it is rotatably connected to the cylinder wall of the cylinder 4, meaning the cylinder wall can rotate relative to the end wall 403. Simultaneously, the end wall 403 itself is fixedly connected to the frame 10 and does not rotate with the cylinder wall. A pipe interface 404 is fixedly connected to this end wall 403, penetrating the end wall 403 and communicating with the negative pressure device's pipeline. This allows the end wall 403 to remain stationary when the cylinder 4 rotates, effectively reducing the difficulty of pipeline installation.

[0034] However, if negative pressure is directly applied to the entire inner cavity of the cylinder 4 in the above scheme, all adsorption holes 402 will be in an adsorption state regardless of their position. On the one hand, this will consume a large amount of negative pressure air volume, increasing energy consumption, and reduce the suction force of the adsorption holes 402 when adsorbing the film. On the other hand, continuous suction from the adsorption holes 402 in non-working areas may cause the film to be adsorbed on the cylinder wall in a position where it should not be adsorbed, disrupting the smooth transport of the film.

[0035] Therefore, such as Figure 7 , Figure 9 and Figure 11 As shown, the present invention designs the internal structure of the cylinder 4 into a partitioned negative pressure structure. Specifically, two polar group channels 401 are arranged radially inside the cylinder 4, forming a cross shape. The polar group channels 401 divide the inner wall of the cylinder 4 into four independent fan-shaped cavities 405.

[0036] Each sector cavity 405 corresponds to an arc-shaped area on the outer circumference of the cylinder 4 located between the ports of adjacent two pole group channels 401. The position of the pipe interface 404 on the end wall 403 is designed so that during the rotation of the cylinder 4, the pipe interface 404 can only communicate with the sector cavities 405 within a specific angle range. When a sector cavity 405 rotates with the cylinder wall to align with the pipe interface 404, the air inside the sector cavity 405 is extracted through the pipe interface 404, forming a negative pressure. The adsorption holes 402 on the corresponding arc surface then generate adsorption force, achieving the adsorption and coating of the film. Those sector cavities 405 that are not connected to the pipe interface 404 are not connected to the negative pressure source, and the adsorption holes 402 on the corresponding arc surface do not generate adsorption force and do not participate in film adsorption.

[0037] Through this zoned negative pressure control design, during the rotation of the cylinder 4, only the adsorption holes 402 on the arc surface currently responsible for film extraction and spreading are in working condition, while the other adsorption holes 402 do not draw suction. This ensures both effective concentration of suction force and reliable adsorption in the adsorption area, while avoiding unnecessary waste of negative pressure energy, thus ensuring overall reliability and economy.

[0038] like Figure 11 and Figure 12 As shown, to further optimize the adsorption efficiency, a partition 407 is also fixedly connected to the inner wall of the sector cavity 405. The partition 407 divides the sector cavity 405 into an independent negative pressure chamber 408, the volume of which is smaller than the overall volume of the sector cavity 405.

[0039] During the rotation of the cylinder 4, the pipe interface 404 is only connected to the negative pressure chamber 408, and not to the entire fan-shaped chamber 405. The purpose of this design is to reduce the volume of the negative pressure action space, so that the negative pressure can be established more quickly and the suction response is more rapid. At the same time, the negative pressure can be concentrated on the key arc surface area where the film needs to be adsorbed, thereby further enhancing the adsorption and adhesion effect on the film 20.

[0040] It should be noted that, as Figure 8 and Figure 9 As shown, rotary seals are installed on the outer walls of the partition 407 and the electrode group channel 401, thereby achieving a seal between the rotary seal and the end wall 403, further improving the sealing effect of the negative pressure chamber 408. At the same time, when one of the electrode group channels 401 is in a horizontal position, the two negative pressure chambers 408 near the feeding conveyor line 1 are connected to the pipe interface 404. That is, at this time, the arc-shaped area on the outer wall of the cylinder 4 where the film is adsorbed still has adsorption capacity, so that the film position remains stable, thereby ensuring that the film can be accurately wrapped on both sides of the electrode group during the coating process.

[0041] As a preferred option, such as Figure 7 and Figure 9 As shown, the two pole group channels 401 inside the cylinder 4 extend radially and converge at the central axis of the cylinder 4. In the convergence area of ​​each pole group channel 401, the walls of the two channels form sharp edges. During the process of pushing the pole group in, the edge of the pole plate or partition paper at its front end is prone to bumping or rubbing against the channel wall, causing jamming or damage.

[0042] To address this issue, each electrode group channel 401 has a clearance opening at its intersection, eliminating sharp corners and creating an open space. Simultaneously, guide rollers 406 are rotatably connected to each clearance opening at the intersection via bearings or pins. The axis of the guide rollers 406 is perpendicular to the length direction of the electrode group channel 401. When the pushing assembly 3 pushes the electrode group into a certain electrode group channel 401, if the front end of the electrode group touches the wall of an adjacent channel in the intersection area, the guide rollers 406 can rotate freely, converting sliding friction into rolling friction. This guides and corrects the deviation of the front end of the electrode group, allowing it to smoothly enter and pass through the target electrode group channel 401, effectively preventing downtime and electrode group damage caused by jamming.

[0043] Meanwhile, the frame 10 is fixedly connected to a guide tube 104, the cross-sectional shape of which matches the cross-sectional shape of the electrode group to be coated, and the end of the guide tube 104 facing the pusher assembly 3 is a flared structure, that is, it is flared outward in the shape of a trumpet, which is used to guide the electrode group so that the electrode group corresponds to the position of the electrode group channel 401.

[0044] The purpose of the flared structure is that when the pushing component 3 pushes the electrode group on the electrode group feeding conveyor line 1 to the electrode group channel 401 of the cylinder 4, even if there is a slight positional deviation of the electrode group at the starting point of the push, the flared guide tube 104 can automatically guide the electrode group through its gradually narrowing inner wall, so that it is accurately aligned with the target electrode group channel 401 port on the cylinder 4, ensuring that the electrode group enters the channel smoothly.

[0045] Furthermore, to facilitate continuous film supply and lamination, a support roller for mounting the film roll is rotatably connected to the frame 10. The film roll is mounted on the support roller and can rotate freely as the film is pulled out. Several pressure rollers 105 are also rotatably connected to the frame 10. The pressure rollers 105 are arranged around the cylinder 4, and the film is guided to the outer wall of the cylinder 4 by the pressure rollers 105 after being drawn from the film roll. The function of the pressure rollers 105 is to maintain a certain tension on the film before it is laminated to the outer wall of the cylinder 4, and to make it flat and tightly adhered to the outer wall of the cylinder 4, avoiding wrinkles or bulges in the film, and ensuring effective adsorption of the film by the adsorption holes 402.

[0046] like Figure 12 and 13 As shown, at least two pressure rollers 105 are symmetrically arranged relative to the guide tube opening 104, so that the film can be flatly covered at the port position of the electrode group channel 401. During the process of the electrode group being pushed into the electrode group channel 401, both ends of the film can be pulled evenly, thereby further ensuring that the film can be evenly covered on both sides of the electrode group.

[0047] In addition, such as Figure 4 , Figure 7 and Figure 12As shown, another preferred embodiment is as follows: the cutting assembly is mounted on the frame 10, and the cutting assembly includes a telescopic device 102 fixedly connected to the frame 10. The telescopic device 102 can be a cylinder. A cutter 103 is fixedly connected to the telescopic end of the telescopic device 102, and the cutting edge of the cutter 103 faces the outer circumferential surface of the cylinder 4. When the cylinder 4 has rotated to adsorb and spread the film to cover the port of a certain electrode group channel 401, and the electrode group channel 401 has rotated to a horizontal or near-horizontal position, the telescopic device 102 is activated, driving the cutter 103 to extend towards the cylinder 4, cutting the continuous film adhering to the outer wall of the cylinder 4 at a predetermined position. The cut film segment is used for coating the current electrode group, and the film end on one side of the film roll continues to be adsorbed onto the outer wall of the cylinder 4 by the adsorption hole 402, preparing for the next film removal.

[0048] like Figure 8 and Figure 9 As shown, to ensure that the cutting edge of the cutter 103 is not damaged when cutting the film and to ensure a complete cut, an axially oriented groove is provided on the circumferential surface of the cylinder 4. This groove is located in the arc-shaped area between any two adjacent pole group channel 401 ports, corresponding to the position where the film is cut. A pad 409 is embedded in the groove. The pad 409 can be made of engineering plastic, nylon, or rubber with moderate hardness and a certain degree of toughness, serving as an "anvil" for cutting the film. When the cutter 103 presses against the surface of the cylinder 4 to cut the film, the blade tip can be slightly embedded in the pad 409, which not only ensures that the film is completely cut but also avoids direct contact between the blade and the metal cylinder wall of the cylinder 4, preventing wear or chipping. This improves the cutting effect and extends the service life of the cutter 103.

[0049] Example 3 A method for operating an automatic die-wrapping machine for electrode group assembly, applied to the automatic die-wrapping machine for electrode group assembly in Embodiment 1 or Embodiment 2, specifically includes the following steps: Step 1: Take the membrane, such as Figure 7 and Figure 8 As shown, the driving device 101 drives the cylinder 4 to rotate, and the negative pressure device starts synchronously, with the pipe interface 404 connected to the negative pressure pipeline. During the rotation of the cylinder 4, the adsorption holes 402 on its outer wall generate adsorption force when passing through the area where the fan-shaped cavity 405 connects to the pipe interface 404, adsorbing and attaching the end of the rolled-out film 20 to the outer wall of the cylinder 4. As the cylinder 4 continues to rotate, the film 20 is continuously pulled out and spread to cover the arc-shaped outer wall of the cylinder 4 until the film 20 covers the port of one of the electrode group channels 401. At this point, the cylinder 4 stops rotating, and the film removal is completed.

[0050] Step 2: Film cutting. The cylinder 4 rotates to adjust its angle, so that the pole group channel 401, whose port is covered by the film 20, rotates to a horizontal state (i.e., the port faces the pusher assembly 3). At this time, the telescopic device 102 of the cutting assembly is activated, driving the cutter 103 to extend. The cutter 103 cuts the film 20 attached to the outer wall of the cylinder 4 at a predetermined position between the ports of two adjacent pole group channels 401. The two ends of the cut film segment are symmetrical vertically with respect to the ports of the pole group channel 401, that is, the middle part of the film segment covers the port, and the two ends are of equal length and are arranged on both sides of the port.

[0051] Step 3: Loading and wrapping the material, such as... Figures 11 to 13 As shown, the pusher assembly 3 operates, pushing the electrode groups already in place on the electrode group feeding conveyor line 1 towards the cylinder 4. The electrode groups are guided into the electrode group channel 401 through the flared end of the guide tube 104. The pusher assembly 3 continues to push the electrode groups deeper into the electrode group channel 401. During this process, because the cut film segment covers the entrance port of the electrode group channel 401, the end face of the electrode group first contacts the middle part of the film segment. As the electrode group is pushed into the channel, the film segment is driven by the electrode group and gradually wraps around the end and upper and lower surfaces of the electrode group. When the electrode group has completely passed through the electrode group channel 401, the tail end of the film segment is also brought into the channel and completely covers the upper and lower surfaces of the electrode group, completing the coating.

[0052] Step 4: Unloading. The pusher assembly 3 continues to push, completely ejecting the electrode group already coated with film 20 from the other end of the electrode group channel 401, allowing it to enter the electrode group unloading conveyor line 2. The electrode group unloading conveyor line 2 starts, transporting the coated electrode group to the next process, thus completing the unloading. The pusher assembly 3 retracts back to its original position, and the cylinder 4 starts rotating again to pick up the film, preparing for the next round of coating cycle.

[0053] Through the aforementioned continuous cycle of film taking, cutting, coating, and unloading operations, this invention achieves full automation of the electrode group coating process. The rotating film taking mechanism of the cylinder 4 cleverly integrates the film pulling and storage actions, eliminating the reciprocating waiting time of traditional film pulling mechanisms. Zoned negative pressure control ensures reliable adsorption and energy savings. Auxiliary structures such as the guide roller 406 and guide nozzle 104 ensure smooth electrode group insertion and stable coating quality. The overall equipment has a compact structure and high cycle time, effectively improving the production efficiency and quality consistency of the battery electrode group coating process.

[0054] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An automatic chip packaging machine for electrode assembly, comprising an electrode feeding conveyor line (1), an electrode unloading conveyor line (2), and a pushing assembly (3), characterized in that, A wrapping device is provided between the electrode group feeding conveyor line (1) and the electrode group unloading conveyor line (2); The coating device includes a frame (10), a cylinder (4) rotatably connected to the frame (10), a drive device (101) for driving the cylinder (4) to rotate fixedly connected, and a cutting assembly for cutting the film fixedly connected. The cylinder (4) is sealed at both ends and has a number of radially arranged pole groups (401) inside, and the pole groups (401) penetrate the circumferential surface of the cylinder (4); the circumferential surface of the cylinder (4) is evenly provided with adsorption holes (402). The inside of the cylinder (4) is connected to a negative pressure device through a pipe, which is used to adsorb the film through the adsorption hole (402) so that the film adheres to the outer wall of the cylinder (4). During the process of pushing the electrode group into the electrode group channel (401) by the pusher assembly (3), the film covers the outside of the electrode group, and the electrode group covered with the film enters the electrode group feeding conveyor line (2) through the electrode group channel (401).

2. The automatic die-packing machine for electrode group assembly as described in claim 1, characterized in that, The cylinder (4) includes two end walls (403), one end wall (403) being fixedly connected to the cylinder wall and rotatably connected to the frame (10); Another end wall (403) is rotatably connected to the cylinder wall and fixedly connected to the frame (10), and this end wall (403) is fixedly connected to a pipe interface (404) that communicates with the negative pressure device.

3. The automatic die-packing machine for electrode group assembly as described in claim 2, characterized in that, Several of the aforementioned polar channels (401) divide the inner wall of the cylinder (4) into independent sector cavities (405), which are used to allow the adsorption holes (402) in the corresponding areas to adsorb the film when the sector cavity (405) is connected to the pipe interface (404) during the rotation of the cylinder (4). Furthermore, during the rotation of the cylinder (4), the sector cavity (405) that does not participate in the film adsorption is not connected to the pipe interface (404).

4. The automatic die-packing machine for electrode group assembly as described in claim 2 or 3, characterized in that, Each of the intersection points of the several pole group channels (401) is provided with a clearance opening, and each clearance opening is rotatably connected to a guide roller (406) for guiding the pole group through the guide roller (406) to avoid jamming at the intersection point of the pole group channels (401).

5. The automatic die-packing machine for electrode group assembly as described in claim 4, characterized in that, The inner wall of the sector cavity (405) is fixedly connected to a partition (407). The partition (407) is used to separate the sector cavity (405) into an independent negative pressure chamber (408). During the rotation of the cylinder (4), only the negative pressure chamber (408) is connected to the pipe interface (404).

6. The automatic die-packing machine for electrode group assembly as described in claim 1, characterized in that, The cutting assembly includes a telescopic device (102) fixedly connected to the frame (10), and a cutter (103) is fixedly connected to the telescopic end of the telescopic device (102).

7. The automatic die-packing machine for electrode group assembly as described in claim 6, characterized in that, The cylindrical body (4) has an axially arranged groove on its circumferential surface. The groove is located between any two adjacent pole group channels (401) ports, and a pad (409) is installed in the groove. The pad (409) is used to contact the cutter when the cutting assembly cuts the film.

8. The automatic die-packing machine for electrode group assembly as described in claim 1, 5, or 7, characterized in that, The frame (10) is fixedly connected to a guide pipe (104). The end of the guide pipe (104) facing the pusher assembly (3) is a flared structure, which is used to guide the pole group so that the pole group corresponds to the pole group channel (401).

9. The automatic die-packing machine for electrode group assembly as described in claim 8, characterized in that, The frame (10) is rotatably connected to a support roller for mounting the film roll, and several pressure rollers (105) for pressing the film tightly against the outer wall of the cylinder (4) by means of the pressure rollers (105), and at least two pressure rollers (105) are symmetrically arranged relative to the guide tube opening (104).

10. A method for operating an automatic chip wrapping machine for electrode group assembly, characterized in that, The automatic die-packing machine for electrode group assembly as described in claims 1 to 9 specifically includes the following steps: Step 1: Take the membrane. Drive the cylinder (4) to rotate using the drive device (101). Use the adsorption holes (402) to adsorb the membrane. During the rotation of the cylinder (4), the membrane adheres to the outer wall of the cylinder (4) and covers the port of one of the polar group channels (401). Step 2: Cut the film. Rotate the cylinder (4) to a position where the pole group channel (401) with the film covering the port is in a horizontal state. Cut the film attached to the outer wall of the cylinder (4) by the cutting component. The two ends of the cut film are symmetrical with respect to the port of the pole group channel (401). Step 3: Feeding and wrapping: The feeding assembly (3) pushes the electrode group on the feeding conveyor line (1) into the electrode group channel (401), and the cut film is wrapped around the outside of the electrode group during the pushing process. Step 4: Unloading. The pusher assembly (3) pushes the pole group out from the port at the other end of the pole group channel (401) and pushes it to the pole group unloading conveyor line (2) to realize unloading.

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