Battery shell punching and feeding device

Abstract

The utility model discloses a battery shell punching and feeding device, a static electricity eliminating structure and a self-weight tensioning roller are sequentially arranged in the film conveying direction, and the self-weight tensioning roller is used for stretching an aluminum plastic film in the vertical direction through the gravity of the self-weight tensioning roller; guide rollers used for conveying films are arranged between the raw material roller and the static electricity eliminating structure, between the static electricity eliminating structure and the self-weight tensioning roller and between the self-weight tensioning roller and the stamping die. Compared with the prior art, the static electricity of the aluminum-plastic film is eliminated, and the static electricity is prevented from adsorbing dust or adhering a film layer, so that the film surface strain caused by the dust during stamping is prevented, and the film layer deformation nonuniformity caused by the static electricity during stamping is prevented; the self-weight tensioning roller tensions the aluminum plastic film with constant weight, tensioning uniformity is guaranteed, tension fluctuation is avoided, wrinkles are avoided, and consistency of punch forming depth and thickness is guaranteed.

Description

Technical Field

[0001] This utility model relates to lithium battery manufacturing, and more particularly to a battery casing punching and feeding device. Background Technology

[0002] In a pouch cell, an aluminum-plastic film (aluminum-plastic composite film) is punched out to form a preliminary outer shell. The cells formed by winding or stacking are placed into the corresponding slots of the preliminary outer shell, and then the preliminary outer shell is folded together. The top and one side of the folded preliminary outer shell are then heat-pressed together for sealing, while the other side is reserved as an injection end.

[0003] Among these, the precision of the battery cell slot, the absence of wrinkles or dents in the outer casing, and the absence of scratches are all important quality indicators. The aluminum-plastic film stamping process is particularly crucial, and its feeding device is one of the key components. Specifically, the aluminum-plastic film is released from the film roll, stamped by a mold, and then the preliminary outer casing is cut out. Therefore, factors such as tension during the feeding process from the film roll to the mold, and static electricity or dust adhesion, can easily affect the stamping quality of the outer casing. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems mentioned above, and to provide a battery casing punching and feeding device that improves tension stability and consistency, eliminates static electricity, and ensures the stamping quality of the battery casing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A battery casing punching and feeding device includes a raw material roller, an electrostatic elimination structure, and a self-weight tensioning roller. The raw material roller is used to mount the film roll and is driven to connect to a film feeding motor. The electrostatic elimination structure and the self-weight tensioning roller are arranged sequentially along the film transfer direction. The self-weight tensioning roller is used to stretch the aluminum-plastic film vertically by its own weight. Guide rollers for film transfer are provided between the raw material roller and the electrostatic elimination structure, between the electrostatic elimination structure and the self-weight tensioning roller, and between the self-weight tensioning roller and the punching die.

[0007] Compared with the prior art, the beneficial effects of this application include: eliminating static electricity in the aluminum-plastic film, preventing static electricity from attracting dust or causing film adhesion, thereby preventing film surface tearing caused by dust during stamping, and preventing uneven film deformation caused by static electricity during stamping; the self-weight tensioning roller keeps the aluminum-plastic film under constant weight tension, ensuring uniform tension, avoiding tension fluctuations, avoiding wrinkles, and ensuring consistent and deep stamping.

[0008] As an improvement to the above technical solution, at least one of the guide rollers is provided with a limiting ring to stop the aluminum-plastic film from shifting, and a limiting channel is defined between the two limiting rings to allow the aluminum-plastic film to pass through.

[0009] As an improvement to the above technical solution, the electrostatic elimination structure includes an ion fan, which is used to blow air toward the aluminum-plastic film being transported.

[0010] As an improvement to the above technical solution, a dust collection hood is also included. The air inlet of the dust collection hood is used to receive the air from the ion fan and to blow air towards the aluminum-plastic film being transported. The air outlet of the dust collection hood is used to connect to the dust collector.

[0011] As an improvement to the above technical solution, the two dust collection hoods are used to eliminate static electricity and dust on the top and bottom surfaces of the aluminum-plastic film, respectively.

[0012] As an improvement to the above technical solution, the frame is equipped with guide rods, and the dust collection hood is used to move closer to or away from the aluminum-plastic film along the guide rods.

[0013] As an improvement to the above technical solution, the dust collection hood is equipped with an air guide plate and a cotton brush roller located below the air guide plate. The air sprayed from the air inlet onto the aluminum-plastic film is guided away from the aluminum-plastic film by the air guide plate. The cotton brush roller is used to wipe the aluminum-plastic film, and the side of the cotton brush roller away from the aluminum-plastic film is used for dust removal by the air.

[0014] As an improvement to the above technical solution, the guide roller is a ceramic-coated guide roller.

[0015] As an improvement to the above technical solution, an electrostatic elimination structure, a self-weight tensioning roller, and an appearance inspection structure are sequentially arranged along the film transfer direction. The appearance inspection structure is used to identify defects to the processor to which it is connected. The appearance inspection structure includes a first camera and a second camera that respectively image the top and bottom surfaces of the aluminum-plastic film.

[0016] As an improvement to the above technical solution, a dustproof housing is also included, in which the raw material roller, the static electricity elimination structure, and the self-weight tensioning roller are disposed. Attached Figure Description

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the battery casing punching and feeding device according to an embodiment of the present invention, with a hidden dustproof casing;

[0019] Figure 2 for Figure 1 A schematic diagram of the battery casing punching and feeding device is shown after some components are hidden.

[0020] Figure 3 for Figure 2 The front view shows the battery casing punching and feeding device.

[0021] The accompanying drawings are only one specific embodiment of this utility model, and the form and structure of this specific embodiment should not limit the extension of other embodiments.

[0022] Frame 100, vertical rod 110, guide rod 120;

[0023] Raw material roller 200, driven gear 210;

[0024] Static electricity elimination structure 300, dust collection hood 310, air inlet 311, air outlet 312, air guide plate 313, cotton brush roller 320;

[0025] 400 self-weight tensioning roller;

[0026] Guide roller 500, limit ring 510;

[0027] Visual inspection structure 600, first camera 610, second camera 620, light ring 630;

[0028] 700 film roll, 710 aluminum-plastic film. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figures 1 to 3 This utility model provides a battery casing punching and feeding device, including a frame 100, a raw material roller 200, an electrostatic elimination structure 300, and a self-weight tensioning roller 400. The raw material roller 200, the electrostatic elimination structure 300, and the self-weight tensioning roller 400 are arranged on the frame 100. The raw material roller 200 is used to mount the film roll 700 and is driven and connected to the film feeding motor. The electrostatic elimination structure 300 and the self-weight tensioning roller 400 are arranged sequentially along the film conveying direction. The two ends of the self-weight tensioning roller 400 are rotatably connected to sliders, and the sliders slide... The vertical rod 110 / vertical rail connecting the frame 100 facilitates the vertical directional lifting and lowering of the self-weight tensioning roller 400. The self-weight tensioning roller 400 is used to stretch the aluminum-plastic film 710 vertically by its own weight. When the aluminum-plastic film 710 is pulled towards the stamping die, the self-weight tensioning roller 400 is lifted by the aluminum-plastic film 710. Guide rollers 500 for film transfer are provided between the raw material roller 200 and the static elimination structure 300, between the static elimination structure 300 and the self-weight tensioning roller 400, and between the self-weight tensioning roller 400 and the stamping die.

[0031] Reference Figures 1 to 3It is understandable that during membrane transport, the membrane belt sequentially winds around various process components along the path, such as the guide roller 500, the static elimination structure 300, and the self-weight tensioning roller 400 of this invention. The bearings connected to the guide roller 500 are lubricated weekly to ensure flexible and stable rotation of the guide roller. (Refer to...) Figure 1 , Figure 2 The frame 100 is provided with a station for installing the film feeding motor, and the raw material roller 200 is connected to a driven gear 210 for driving the film feeding motor.

[0032] When aluminum-plastic film 710 is produced in rolls, a bottom film is connected to the end of the roll. This bottom film is used for priority winding of the film roll mandrel and for final pull-out of the mandrel, ensuring full utilization of the film end. In practice, the film roll 700 is connected to the raw material roller 200 via the film roll mandrel. The film roll mandrel belongs to the film roll 700, and the raw material roller 200 belongs to the feeding device of this utility model. (See also...) Figure 1 , Figure 2 The raw material roller 200 fixes the film roll 700 by means of air jacking; air is blown inside the raw material roller 200, and multiple abutment bars of the raw material roller 200 jointly support the inner wall of the film roll mandrel to complete the fixation of the film roll 700.

[0033] The tension force is usually set to 5-15N. Too much tension will cause the aluminum-plastic film to stretch and deform, while too little tension will easily cause wrinkles. Further optimized, the self-weight tension roller 400 has detachable rotating connecting sliders at both ends. The self-weight tension roller 400 is available in a variety of different quality specifications. The corresponding quality of the self-weight tension roller 400 can be selected according to the different thicknesses and composition ratios of the aluminum-plastic film 710.

[0034] For example, at least one slider includes a first segment that is slidably connected to a vertical rod 110 and a second segment that is rotatably connected to a self-weight tensioning roller 400, the second segment being screwed to the first segment.

[0035] The operation process of this utility model can be as follows: film roll installation step, film roll 700 is put into raw material roller 200, raw material roller 200 fixes film roll 700, and the film head pulled out by film roll 700 passes through static elimination structure 300, self-weight tension roller 400, punching device and cutting device in sequence.

[0036] In the single-piece film feeding step, when the self-weight tension roller 400 is in the high position, it indicates that the temporarily placed aluminum-plastic film 710 is insufficient. The high position proximity switch detects this, and the film feeding motor drives the film roll 700 to rotate. The aluminum-plastic film 710 pulls out a new temporarily placed aluminum-plastic film. The self-weight tension roller 400 stretches the new temporarily placed aluminum-plastic film by its own gravity. When the self-weight tension roller 400 is in the low position, it indicates that the buffer and tension of the temporarily placed aluminum-plastic film is sufficient. The low position proximity switch detects this, and the film feeding motor stops the film roll 700, completing the preparation of a single piece of aluminum-plastic film.

[0037] In the stamping shell step, the film-pulling structure of the stamping device or cutting device intermittently pulls the new temporary aluminum-plastic film according to the length of each shell, so that the aluminum-plastic film 710 is intermittently fed into the stamping die and the cutter, so as to intermittently stamp out the prototype shell, and the cutter cuts out each intermittent prototype shell one by one.

[0038] As the temporary aluminum-plastic film is gradually pulled toward the stamping device, the weight of the temporary aluminum-plastic film is gradually used up, and the self-weight tensioning roller 400 is gradually lifted by the temporary aluminum-plastic film; the single film feeding step, the outer shell punching step, the single film feeding step, the outer shell punching step, ... are repeated.

[0039] Compared with the prior art, the beneficial effects of this application include: eliminating static electricity in the aluminum-plastic film 710, preventing static electricity from attracting dust or causing film adhesion, thereby preventing film surface tearing caused by dust during stamping, and preventing uneven film deformation caused by static electricity during stamping; the self-weight tensioning roller 400 tensions the aluminum-plastic film 710 with constant weight, ensuring uniform tension, avoiding tension fluctuations, avoiding wrinkles, and ensuring consistent and deep stamping.

[0040] In some embodiments of this invention, photoelectric sensors or CCD vision are used to monitor the edge position in real time. The photoelectric sensors and CCD cameras are electrically connected to the processor, and the correction accuracy must be ≤ ±0.4mm to avoid film material deviation causing stamping position offset. This ensures stamping position accuracy.

[0041] Reference Figure 1 , Figure 2 In some embodiments of this invention, at least one guide roller 500 is provided with a limiting ring 510 to stop the aluminum-plastic film 710 from shifting, and a limiting channel is defined between two limiting rings 510 to allow the aluminum-plastic film 710 to pass through. In some configurations, one guide roller 500 with correction and limiting is provided, which is used for correction and limiting before being fed into the stamping die; furthermore, the positioning structure of the stamping die and the limiting channel together correct the aluminum-plastic film 710. In some configurations, at least two guide rollers 500 with correction and limiting are provided.

[0042] In some embodiments of this invention, at least one guide roller 500 is connected to a correction cylinder or correction motor, which drives the guide roller 500 to move erratically. When a photoelectric sensor or CCD camera detects a deviation vector x of the aluminum-plastic film 710, the corresponding erratic movement of the guide roller 500 is vector y = -x.

[0043] The static eliminator structure 300 can be a metal roller or a metal fiber composite roller. The metal roller is used to contact the aluminum-plastic film 710 being transported, and the metal roller is electrically connected to the ground wire. In some embodiments of this utility model, the static eliminator structure 300 includes an ion fan, also known as a static eliminator, which is used to blow air (ionize air) toward the aluminum-plastic film 710 being transported.

[0044] Understandably, the fan blades of the ion fan rotate to generate airflow. The ion fan is also equipped with an ionization structure to ionize the air and generate positive and negative ions. The positive and negative ions mainly flow due to the high flow rate. A small number of positive / negative ions that are easily attracted by negative / positive static electricity are guided to the aluminum-plastic film 710 to eliminate the static electricity of the aluminum-plastic film 710.

[0045] The ion blower can directly spray 710 aluminum-plastic film. In some cases, the purchased 700 film roll may contain a small amount of residual dust. To simultaneously address static electricity and dust, please refer to... Figures 1 to 3 In some embodiments of this utility model, a dust collection hood 310 is also included. The air inlet 311 of the dust collection hood 310 is used to receive the air from the ion fan and also to blow air toward the aluminum-plastic film 710 being transported. That is, the opening of the dust collection hood 310 faces the aluminum-plastic film 710. The air outlet 312 of the dust collection hood 310 is used to connect to a dust collector, such as a filter, liquid suction tank, atomizing spray tower, etc.

[0046] Reference Figures 1 to 3 Ideally, the dust collection hood 310 is equipped with an air guide plate 313, so that the air sprayed from the air inlet 311 onto the aluminum-plastic film 710 is guided away from the aluminum-plastic film 710 by the air guide plate 313.

[0047] Reference Figures 1 to 3 In some embodiments of this utility model, two dust collection hoods 310 respectively cover the top and bottom surfaces of the aluminum-plastic film 710, that is, the top and bottom surfaces of the aluminum-plastic film 710 are respectively covered by the openings of the corresponding dust collection hoods 310, and the two dust collection hoods 310 are respectively used to eliminate static electricity and dust on the top and bottom surfaces of the aluminum-plastic film 710.

[0048] Reference Figure 1 , Figure 2 In some embodiments of this utility model, the frame 100 is provided with a guide rod 120, and the dust collection hood 310 is used to move closer to or further away from the aluminum-plastic film 710 along the guide rod 120. After the dust collection hood 310 covers the aluminum-plastic film 710, the movement of the dust collection hood 310 is limited by a retaining ring; the two dust collection hoods 310 are far apart so that the gap can be opened to facilitate the operation of the aluminum-plastic film 710.

[0049] Reference Figure 3In some embodiments of this utility model, a cotton brush roller 320 is provided inside the dust collection hood 310, located below the air guide plate 313. The cotton brush roller 320 is used to wipe the aluminum-plastic film 710. The side of the cotton brush roller 320 facing away from the aluminum-plastic film 710 is used for dust removal by airflow, with the dust being blown away by ionized airflow and / or the dust being sucked away by the airflow. The cotton brush roller 320 can wipe away the de-energized dust while being rubbed by the aluminum-plastic film 710. In some configurations, the cotton brush roller 320 is connected to a sweeping motor, and the cotton brush roller 320 actively wipes the aluminum-plastic film 710. The cotton brush roller 320 only needs to be able to contact and wipe away the dust, avoiding tight contact between the cotton brush roller 320 and the aluminum-plastic film 710 to prevent frictional resistance during wiping. This slight wiping is unlikely to cause the aluminum-plastic film 710 to heat up, and the cotton brush roller 320 and the aluminum-plastic film 710 are not prone to heat generation due to airflow.

[0050] In some embodiments of this utility model, the guide roller 500 is a ceramic-coated guide roller, and the surface of the guide roller 500 is not easily contaminated or damaged, thus avoiding scratches on the aluminum-plastic film 710 by the scratched or dusty guide roller 500.

[0051] Reference Figures 1 to 3 In some embodiments of this utility model, an electrostatic elimination structure 300, a self-weight tensioning roller 400, and an appearance inspection structure 600 are sequentially arranged along the film transfer direction. The appearance inspection structure 600 is used to mark defects to the processor it is connected to. That is, if an appearance defect is found when the aluminum-plastic film 710 is transferred for a length L1 during the intermittent film transfer and punching process, the L1 position of that transfer is marked as defective, and that section of aluminum-plastic film 710 for L1 length should be cut out as scrap. A new set of shell material is then calculated, and the aluminum-plastic film 710 is transferred again for a shell length. Further preferably, the appearance inspection structure 600 includes a first camera 610 and a second camera 620 that respectively image the top and bottom surfaces of the aluminum-plastic film 710. It is confirmed that the section of aluminum-plastic film 710 to be divided into shells is free of defects such as scratches, creases, oxidation spots, and coating peeling. Any defective areas found again are also cut off.

[0052] A processor, such as a CPU, is used to receive signals, process and calculate signals, and output signals. A battery casing punching machine includes a feeding device, a punching device, and a cutting device. A battery casing punching machine may only have one central control panel (containing a processor).

[0053] Reference Figures 1 to 3 In some embodiments of this utility model, the appearance inspection structure 600 further includes a light ring 630, and the first camera 610 and the second camera 620 are respectively surrounded by the corresponding light ring 630.

[0054] In some embodiments of this utility model, a dustproof housing is also included, in which the frame 100, raw material roller 200, static elimination structure 300, self-weight tensioning roller 400, and appearance inspection structure 600 are disposed.

[0055] Furthermore, the battery punching and cutting machine is installed in a cleanroom to ensure no dust adheres. Some requirements specify a Class 100,000 cleanroom standard. The battery casing punching and cutting machine can be housed in a single enclosure, with the feeding device, punching device, and cutting device all located within it.

[0056] The dustproof enclosure is equipped with temperature and humidity sensors, which are used to detect the temperature and humidity inside the dustproof enclosure.

[0057] Humidity should be ≤30% to prevent moisture absorption by the aluminum-plastic film 710, which could lead to poor heat sealing later. The preferred temperature for transferring the aluminum-plastic film 710 is 20–25℃; the stamping temperature can be 25℃–40℃ to improve the consistency of the forming depth.

[0058] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A battery casing punching and feeding device, characterized in that, include: Raw material roller, used to mount the film roll and drive the film feeding motor; An electrostatic elimination structure and a self-weight tensioning roller are arranged sequentially along the film transfer direction. The self-weight tensioning roller is used to stretch the aluminum-plastic film vertically by its own weight. Guide rollers for film transfer are provided between the raw material roller and the static elimination structure, between the static elimination structure and the self-weight tensioning roller, and between the self-weight tensioning roller and the stamping die.

2. The battery casing punching and feeding device according to claim 1, characterized in that, At least one of the guide rollers is provided with a limiting ring to stop the aluminum-plastic film from deviating, and a limiting channel is defined between the two limiting rings to allow the aluminum-plastic film to pass through.

3. The battery casing punching and feeding device according to claim 1, characterized in that, The static elimination structure includes an ion fan for blowing air toward the aluminum-plastic film being transported.

4. The battery casing punching and feeding device according to claim 3, characterized in that, It also includes a dust collection hood, whose air inlet is used to receive the air from the ion fan and to blow air towards the aluminum-plastic film being transported, and whose air outlet is used to connect to the dust collector.

5. The battery casing punching and feeding device according to claim 4, characterized in that, The two dust collection hoods are used to eliminate static electricity and dust on the top and bottom surfaces of the aluminum-plastic film, respectively.

6. The battery casing punching and feeding device according to claim 4 or 5, characterized in that, The frame is equipped with guide rods, and the dust collection hood is used to move closer to or away from the aluminum-plastic film along the guide rods.

7. The battery casing punching and feeding device according to claim 4 or 5, characterized in that, The dust collection hood is equipped with an air guide plate and a cotton brush roller located below the air guide plate. The air sprayed from the air inlet onto the aluminum-plastic film is guided away from the aluminum-plastic film by the air guide plate. The cotton brush roller is used to wipe the aluminum-plastic film, and the side of the cotton brush roller away from the aluminum-plastic film is used for dust removal by the air.

8. The battery casing punching and feeding device according to any one of claims 1 to 5, characterized in that, The guide roller is a ceramic-coated guide roller.

9. The battery casing punching and feeding device according to any one of claims 1 to 5, characterized in that, An electrostatic elimination structure, a self-weight tensioning roller, and a visual inspection structure are sequentially arranged along the film transfer direction. The visual inspection structure is used to identify defects to the processor to which it is connected. The visual inspection structure includes a first camera and a second camera that respectively image the top and bottom surfaces of the aluminum-plastic film.

10. The battery casing punching and feeding device according to any one of claims 1 to 5, characterized in that, It also includes a dustproof housing, in which the raw material roller, the static elimination structure, and the self-weight tensioning roller are disposed.

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