Laser die cutting and winding all-in-one machine

Abstract

The utility model relates to the technical field of battery production equipment, in particular to a laser die cutting and winding all-in-one machine, and aims to solve the problems that in the prior art, in the process that a laser die cutting and winding all-in-one machine detects poor rolling of a pole piece, raw material waste of the pole piece is easily caused during waste discharge, and the production cost is high. In order to achieve the purpose, the laser die cutting and winding all-in-one machine comprises a roller passing assembly, a pole piece detection assembly and a die cutting assembly, and the roller passing assembly, the pole piece detection assembly and the die cutting assembly are suitable for being sequentially arranged in the conveying direction of pole pieces. The die cutting assembly comprises a control unit and a cutting unit, the cutting unit and the pole piece detection assembly are both electrically connected with the control unit, and the control unit is configured to control the cutting unit to reset and cut when the pole piece detection assembly detects that the pole piece is not rolled in place. According to the technical scheme, waste is discharged in time, pole piece raw materials are saved, the utilization rate of the pole piece raw materials is increased, the production cost is reduced, and the production economy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production equipment, and particularly provides a laser die-cutting and winding integrated machine. Background Art

[0002] At present, winding machines are generally used in the energy storage industry to produce battery cores. Since winding machines have very high requirements for the thickness fluctuation of incoming pole pieces, if the thickness fluctuation of incoming pole pieces is large, it will affect the alignment of the tabs of the battery core and have an impact on the subsequent production processes and the performance of the battery core. Therefore, a laser die-cutting and winding integrated machine has emerged, integrating the die-cutting and winding processes. This equipment can improve the process quality of the battery, increase the utilization rate of the pole pieces, save material costs, and improve the utilization rate of the factory building, with great advantages.

[0003] Currently, a CCD is used to online detect unrolled pole pieces on the laser die-cutting and winding integrated machine. This detection device is installed 1 meter after the laser die-cutting. The CCD captures the grayscale value of the surface of the pole piece to determine whether there is an unrolled phenomenon. If there are defects, the signal is fed back to the laser die-cutting PLC for the tab cutting and resetting operation, and the previous pole piece is scraped off starting from the tail tab. However, in the above solution, 1 meter of pole piece will be wasted, increasing production costs and reducing economic benefits. In addition, the grayscale of the pole piece changes greatly and is not easy to distinguish from other types of defects, resulting in misjudgment. It is easy for unrolled pole pieces to flow into the subsequent processes, and the unrolled and undetected pole pieces wound into the battery core will affect the battery performance.

[0004] Correspondingly, the field needs a new laser die-cutting and winding integrated machine to solve the above problems. Summary of the Utility Model

[0005] The utility model aims to solve the above technical problems, that is, to solve the problem that in the prior art, during the detection of unrolled defects of pole pieces by a laser die-cutting and winding integrated machine, waste of pole piece raw materials is easily caused during waste discharge, resulting in relatively high production costs.

[0006] In a first aspect, the utility model provides a laser die-cutting and winding integrated machine, which includes:

[0007] A roller assembly, a pole piece detection assembly and a die-cutting assembly, and the roller assembly, the pole piece detection assembly and the die-cutting assembly are adapted to be arranged in sequence along the conveying direction of the pole piece;

[0008] The die-cutting assembly includes a control unit and a cutting unit, and both the cutting unit and the pole piece detection assembly are electrically connected to the control unit. The control unit is configured to control the cutting unit to reset and cut when the pole piece detection assembly measures that the pole piece is not rolled in place.

[0009] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the pole piece detection component includes at least two detection sensors, and the at least two detection sensors are adapted to be respectively arranged on the upper and lower sides of the pole piece.

[0010] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the pole piece detection component further includes a detection bracket, and the detection sensors on the upper and lower sides of the pole piece are both connected to the detection bracket.

[0011] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the detection sensor is a color mark sensor.

[0012] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the cutting unit includes a cutting cavity and a laser cutting component arranged in the cutting cavity. The cutting cavity is provided with an inlet and an outlet, the pole piece is adapted to pass through the cutting cavity, and the laser cutting component is adapted to cut the pole tabs of the pole piece.

[0013] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the laser cutting component includes a laser and a field lens. The light-emitting end of the laser is coaxial with the field lens, and the light-emitting side of the field lens faces the pole piece.

[0014] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the laser cutting component further includes a cutting workbench, and the pole piece is adapted to be arranged between the cutting workbench and the field lens.

[0015] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the roller assembly includes a first roller, a second roller and a third roller. Among them, the pole piece detection component is arranged between the first roller and the second roller, and the third roller is arranged on the front side of the inlet of the cutting cavity.

[0016] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the laser die-cutting and winding integrated machine further includes a winding component. The winding component is arranged on the outlet side of the cutting cavity, and the pole piece is adapted to be wound on the winding component.

[0017] In the specific embodiment of the above-mentioned laser die-cutting and winding integrated machine, the winding component includes a winding needle, and a receiving groove is arranged on the winding needle to fix the ends of the pole piece and the separator.

[0018] In the case of adopting the above technical solution, the laser die-cutting and winding integrated machine disclosed by the present utility model improves the overall layout structure of the equipment, installs the pole piece detection component in front of the die-cutting component, and then optimizes the waste discharging logic of the control unit. According to the feedback result of the pole piece detection component, reset cutting is carried out in a timely manner at the position where the pole piece is detected to be defective. On the one hand, it can more effectively detect the defects of the pole piece and avoid flowing into the subsequent processes. On the other hand, it can also minimize the waste of the pole piece raw material during waste discharging, realize timely reset cutting when detecting defects, and avoid the waste of the pole piece length between the die-cutting component and the pole piece detection component. It realizes timely waste discharging, saves the pole piece raw material, improves the utilization rate of the pole piece raw material, reduces the production cost, and improves the production economy. Brief Description of the Drawings

[0019] The following describes the preferred embodiments of the present utility model in conjunction with the drawings, in which:

[0020] Figure 1 is the overall layout schematic diagram of the laser die-cutting and winding integrated machine in the present utility model;

[0021] Figure 2 is the partial structure schematic diagram of the winding part of the winding needle in the present utility model.

[0022] Among them, 1. Control unit, 2. Detection sensor, 3. Detection bracket, 4. Cutting cavity, 5. Inlet, 6. Outlet, 7. Laser, 8. Field lens, 9. Cutting workbench, 10. First idler roller, 11. Second idler roller, 12. Third idler roller, 13. Winding needle. Detailed Embodiments

[0023] The following describes the preferred embodiments of the present utility model with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not used to limit the protection scope of the present utility model. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0024] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation" and "connection" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Referring to Figure 1 , the present utility model provides a laser die-cutting and winding integrated machine, including a roller assembly, a pole piece detection assembly and a die-cutting assembly. The roller assembly, the pole piece detection assembly and the die-cutting assembly are arranged in sequence along the conveying direction of the pole piece. The die-cutting assembly includes a control unit 1 and a cutting unit. The cutting unit and the pole piece detection assembly are both electrically connected to the control unit 1. The control unit 1 is configured to control the cutting unit to reset the cutting when the pole piece detection assembly detects that the pole piece is not rolled in place.

[0027] In this embodiment, the pole piece is conveyed by means of the roller assembly. The roller assembly is a roller group formed by multiple rollers. The pole piece passes through each roller, and the rollers rotate to drive the pole piece to be conveyed along the set conveying direction. The pole piece detection assembly and the die-cutting assembly are arranged in the conveying direction of the pole piece. The installation position of the pole piece detection assembly should be based on the basic requirement of being able to detect the coating surface of the pole piece. The pole piece detection assembly detects whether the surface of the pole piece has been rolled and meets the requirements. When the surface of the pole piece meets the production process requirements, the die-cutting assembly located downstream of the pole piece detection assembly will cut the pole piece. The die-cutting assembly cuts pole lugs on the pole piece according to the design requirements to prepare for subsequent production.

[0028] The die-cutting assembly further includes a control unit 1 and a cutting unit. The pole piece detection assembly and the cutting unit are both electrically connected to the control unit 1. The control unit 1 can receive the detection data from the pole piece detection unit and analyze it to judge whether there are defects on the surface of the pole piece that have not been rolled to meet the production process requirements. If there are defects, the control unit 1 will control the cutting unit to reset the cutting in time. Resetting the cutting can be understood as avoiding the defective position of the pole piece and then re-cutting the pole lugs according to the set program, or cutting off all the pole lug parts at the defective position and then re-cutting the pole lugs according to the set program. After resetting the cutting, it is convenient to remove and discharge the defective part in the subsequent process. Exemplarily, the control unit 1 can be any one of a control unit based on a PLC (programmable logic controller), a control unit based on an embedded system, a control unit based on a PC (personal computer), and a distributed control system. Different types of control units are selected according to the actual situation to meet different application requirements.

[0029] It should be noted that in this embodiment, the connection methods of the pole piece detection component and the cutting unit to the control unit 1 can be wired communication connections or wireless communication connections, which are not limited herein. Wired communication connection is a common and stable connection method. It usually realizes the transmission of data and control signals through physical media such as cables and optical fibers. Wireless connection realizes the transmission of data and control signals through wireless signals (such as Wi-Fi, Bluetooth, ZigBee, etc.). The advantage of this connection method lies in its flexibility and convenience. The specific connection method can be selected according to actual needs and the on-site environment. No matter which connection method is adopted, it is necessary to ensure the stability and reliability of communication to meet the accuracy and efficiency requirements of pole piece detection and cutting.

[0030] Based on the above embodiment, the pole piece detection component includes at least two detection sensors 2, and at least one detection sensor 2 is arranged on the upper and lower surfaces of the pole piece. Since the gray scale of the pole piece changes greatly, misjudgment is likely to occur during detection. Therefore, the position layout of the detection sensors 2 is optimized. Taking two detection sensors 2 as an example, one detection sensor 2 is arranged on each side of the pole piece, and the two detection sensors 2 can be arranged opposite to each other to detect the upper and lower surfaces of the same area of the pole piece, so as to reduce the possibility of misjudgment.

[0031] It should be noted that the number and installation position of the detection sensors 2 are optional, and different detection schemes can be adaptively selected according to the width of the pole piece to meet different detection accuracies and comprehensiveness.

[0032] Based on the above embodiment, the detection sensors 2 can be installed on the detection bracket 3 to keep a relatively stable detection distance between the multiple detection sensors 2 and the pole piece. In conceivable embodiments, the detection bracket 3 can adopt a U-shaped bracket structure. The U-shaped detection bracket 3 is placed horizontally, and the pole piece passes through the two cantilevers of the detection bracket 3. The detection sensors 2 can be reasonably arranged at intervals and installed on the upper and lower cantilevers. Of course, the detection bracket 3 can also adopt other structural forms as long as it can stably install the detection sensors 2.

[0033] The detection sensor 2 can adopt a color mark sensor, but this is not the only limitation. Considering the large gray scale change on the surface of the pole piece, using a color mark sensor can better identify the defects on the surface of the pole piece. The detection sensor 2 can also adopt a gray scale sensor, a macro sensor, a light intensity sensor, etc. The sensor for detecting the surface of the pole piece can be selected according to specific needs and application scenarios.

[0034] Exemplarily, taking the color mark sensor as an example, the available color mark sensor model is Keyence LR-w500C. The color value of the pole piece before rolling is within 500, and the color value of the rolled pole piece is above 900. The threshold of the color mark sensor can be set according to the color value. When the value detected by the color mark sensor is lower than 500, this value is fed back to the control unit 1, and the control unit 1 will give that there is a defect of unrolled pole piece at the detection position, thereby controlling the cutting unit to reset the cutting.

[0035] On the basis of the above embodiment, the pole piece is cut for the tab in the cutting unit. The cutting unit includes a cutting cavity body 4, the cutting cavity body 4 has an inlet 5 and an outlet 6. The pole piece enters from the inlet 5 of the cutting cavity body 4 and exits from the outlet 6. A laser cutting component is installed in the cutting cavity body 4, and the laser cutting component cuts the tab of the pole piece, cutting out the tab shape and tab spacing according to the process requirements. The cutting cavity body 4 provides an independent working environment for laser cutting, isolates external environmental dust, and can also play a safety protection role.

[0036] On the basis of the above embodiment, the laser cutting component includes a laser 7 and a field lens 8. The connection line between the laser 7 and the field lens 8 is perpendicular to the surface of the pole piece to be cut. The laser 7 generates laser radiation, and the field lens 8 can focus the collimated laser beam on a smaller area of the focus, improving the energy density of the laser beam, and further improving the cutting ability and efficiency of laser processing.

[0037] On the basis of the above embodiment, the connection line between the laser 7 and the field lens 8 is perpendicular to the surface of the pole piece to be cut. On the other side of the pole piece, there is also a cutting workbench 9. On the one hand, the cutting workbench 9 can support the pole piece. On the other hand, it can prevent the laser from irradiating other positions and causing cutting damage, improving the safety during the use of laser cutting.

[0038] On the basis of the above embodiment, the over-roller assembly provides support and conveying power for the pole piece. The over-roller assembly can be provided with multiple rollers, and the pole piece passes through the middle of the rollers. The support between the rollers makes the pole piece taut. In this embodiment, the over-roller assembly can be provided with a first over-roller 10, a second over-roller 11 and a third over-roller 12. The first over-roller 10 and the second over-roller 11 are installed on both sides of the pole piece detection component to tighten the pole piece and keep the surface flat, so as to facilitate the pole piece detection component to detect defects. The third over-roller 12 is installed on the front side of the inlet 5 of the cutting cavity body 4. A winding assembly is also installed on the outlet 6 side of the cutting cavity body 4. The winding assembly and the third over-roller 12 tighten the part of the pole piece located in the cutting cavity body 4, enabling the cutting unit to cut the tab and improving the accuracy of tab cutting.

[0039] Refer to Figure 2, the winding assembly winds the positive and negative electrode plates and the separator after laser cutting into the cylindrical structure of the battery cell in a specific order and process requirements, which are the lower separator 14, the negative electrode plate 15, the upper separator 16, and the positive electrode plate 17 in sequence. The winding assembly includes a winding needle 13, and the winding needle 13 is provided with a receiving groove, and the ends of the positive and negative electrode plates and the separator can be fixed in the groove, and rotating the winding needle 13 can wind the electrode plates. The shape of the winding needle 13 generally includes a circular shape, an oval shape, and a flat diamond shape. Different shapes of the winding needle 13 have an impact on the flatness of the tabs of the battery cell, the winding speed, and the stress uniformity inside the wound core. The shape of the winding needle 13 generally includes a circular shape, an oval shape, and a flat diamond shape. Different shapes of the winding needle 13 have an impact on the flatness of the tabs of the battery cell, the winding speed, and the stress uniformity inside the wound core. Therefore, the winding needle 13 needs to be adaptively selected according to the actual situation.

[0040] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A laser die-cutting and winding integrated machine, characterized in that The laser die-cutting and winding integrated machine includes: a roller assembly, a pole piece detection assembly, and a die-cutting assembly. The roller assembly, the pole piece detection assembly, and the die-cutting assembly are sequentially arranged along the conveying direction of the pole piece; the die-cutting assembly includes a control unit (1) and a cutting unit. The cutting unit and the pole piece detection assembly are both electrically connected to the control unit (1). The control unit (1) is configured to control the cutting unit to reset and cut when the pole piece detection assembly measures that the pole piece is not rolled in place.

2. The laser die-cutting and winding integrated machine according to claim 1, characterized in that The pole piece detection assembly includes at least two detection sensors (2), and the at least two detection sensors (2) are respectively arranged on the upper and lower sides of the pole piece.

3. The laser die-cutting and winding integrated machine according to claim 2, characterized in that, The pole piece detection assembly further includes a detection bracket (3), and the detection sensors (2) on the upper and lower sides of the pole piece are both connected to the detection bracket (3).

4. The laser die-cutting and winding integrated machine according to claim 2 or 3, characterized in that, The detection sensor (2) is a color mark sensor.

5. The laser die-cutting and winding integrated machine according to claim 1, wherein, The cutting unit includes a cutting cavity (4) and a laser cutting component arranged in the cutting cavity (4). The cutting cavity (4) is provided with an inlet (5) and an outlet (6). The pole piece is adapted to pass through the cutting cavity (4), and the laser cutting component is adapted to cut the pole lug of the pole piece.

6. The laser die-cutting and winding integrated machine according to claim 5, wherein The laser cutting component includes a laser (7) and a field lens (8). The light-emitting end of the laser (7) is coaxial with the field lens (8), and the light-emitting side of the field lens (8) faces the pole piece.

7. The laser die-cutting and winding integrated machine according to claim 6, characterized in that, The laser cutting component further includes a cutting workbench (9), and the pole piece is adapted to be arranged between the cutting workbench (9) and the field lens (8).

8. The laser die-cutting and winding integrated machine according to any one of claims 5-7, characterized in that The roller assembly includes a first roller (10), a second roller (11), and a third roller (12). Among them, the pole piece detection assembly is arranged between the first roller (10) and the second roller (11), and the third roller (12) is arranged on the front side of the inlet (5) of the cutting cavity (4).

9. The laser die-cutting and winding integrated machine according to claim 8, wherein, The laser die-cutting and winding integrated machine further includes a winding assembly. The winding assembly is arranged on the outlet (6) side of the cutting cavity (4), and the pole piece is adapted to be wound on the winding assembly.

10. The laser die-cutting and winding integrated machine according to claim 9, wherein, The winding assembly includes a winding needle (13), and a receiving groove is arranged on the winding needle (13) to fix the ends of the pole piece and the diaphragm.

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