A lithium battery aluminum foil coating processing production line

Abstract

The present invention discloses a lithium battery aluminum foil coating processing production line, which relates to the field of lithium battery processing and includes: an unwinder, a coater, an inspection and correction integrated machine, a winder arranged in sequence from upstream to downstream, and a control device for connecting and controlling the above-mentioned devices; by combining the detection mechanisms that need to be adjusted in the X and Y directions in the edge detection device with the moving mechanisms that can move in the X and Y directions in the feeding correction device, the present invention eliminates the investment in additional power devices and electricity, and two sets of edge detection devices are arranged on the front side of the unfolding mechanism to more rigorously judge the types of faults and filter out false reports of faults. The carbon-coated aluminum foil processed by the present invention has a high pass rate of good products, good product consistency, low technical requirements for coating equipment, small floor area, low equipment cost, and energy saving, showing significant technological progress in the field.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery processing, and particularly to a lithium battery aluminum foil coating processing production line. Background Art

[0002] The carbon-coated foil is mainly applied to the battery field, especially in lithium-ion batteries with a silicon-based negative electrode of high energy density. There are extremely high requirements for the coverage rate of the carbon coating layer on the surface of the overall carbon-coated foil. At present, the main quality inspection method for the coverage rate of the carbon coating layer on the surface of the printed carbon-coated foil in China is to sample and inspect after printing or not monitor at all, and only inspect when new products are promoted. The printing production of the carbon-coated foil is usually continuous production with a high printing speed, and the daily production volume is tens of thousands of meters. The length of a single roll is in kilometers. For the conventional inspection, only the first and last pieces are taken from a section of finished foil before starting and after printing. In the actual printing process, only the human eye is used to measure and inspect the printing appearance, such as: the substrate wrinkling when passing through the roller, printing omission, printing size, etc. It is impossible to monitor the printing coverage rate of the carbon-coated foil. Simply analyzing from the printing quality, the monitoring intensity of using the manual inspection method to monitor the printing effect is insufficient. Along with the long inspection time in the actual production process and the inability to monitor the whole process, at the same time, the printing coverage rate of the actual foil cannot be monitored.

[0003] Application No. CN201920760900.4 proposes an on-line appearance image detection device for carbon-coated foil printing, which uses CCD cameras arranged on the upper and lower sides of the foil to detect defects on both carbon-coated sides. However, this device cannot detect other faults generated during the transportation of the carbon-coated aluminum foil.

[0004] Application No. CN201320089961.5 proposes a lithium battery rolling automatic edge alignment and deviation correction device, which uses a photoelectric sensor to align the edge of the foil during transportation and then adjusts the rear take-up roller for correction. However, it can only detect and process the deviation of the foil and cannot detect and process other abnormal conditions such as the wrinkling, missing edge, and warping of the foil.

[0005] To solve the above problems, our company has developed a lithium battery aluminum foil carbon coating CCD edge detection device for detecting transportation faults and a lithium battery foil feeding correction device for correcting faults. However, in the actual use process, there are still the following defects:

[0006] 1. Since the two belong to two sets of equipment, they occupy a large area and the distance between them is long. After the front CCD edge detection device detects a fault, the correction time point and position of the lithium battery foil feeding correction device calculated using the distance between the two and the feeding speed will inevitably deviate.

[0007] 2. Also, since the two belong to two sets of equipment, a relatively large number of position adjustment devices will be used to move the detection mechanism and the correction mechanism, resulting in an increase in cost and a relatively high possibility of system errors;

[0008] 3. The lithium battery foil feeding and correcting device uses two relatively large flattening rollers, one in the front and the other in the back, to flatten the wrinkled foil. It must use a lifting mechanism to lower the flattening rollers for operation when needed and then raise them for standby. This not only consumes electricity, but also has a relatively large static friction force, which may cause the foil to break;

[0009] 4. The lithium battery aluminum foil carbon coating CCD edge detection device is prone to false alarms of faults due to sudden situations such as mechanical jitter and jump. Summary of the Invention

[0010] In order to solve the above problems existing in the existing production line at one time during the lithium battery aluminum foil coating process, the present invention proposes a lithium battery aluminum foil coating processing production line, including: an unwinder, a coater, an inspection and correction integrated machine, a rewinder arranged in sequence from upstream to downstream, and a control device for connecting and controlling the above-mentioned devices; the inspection and correction integrated machine includes: a processing platform, a guide roller A and a guide roller B are arranged at the front end of the processing platform, and a guide roller C is arranged at the rear end, wherein the bottoms of the guide roller B and the guide roller C are tangent to the upper surface of the processing platform; a through groove perpendicular to the feeding direction is arranged on the upstream side of the processing platform, and a telescopic device is arranged at each end of the through groove, and each telescopic device drives a slider A to slide in the through groove. A backlight is installed on one side of the slider A close to the edge of the processing platform, and two plug-in type edge detection components are installed on the side close to the center line of the processing platform, one of the plug-in type edge detection components is close to the upstream, and the other is close to the downstream; a gantry is arranged in the middle section of the processing platform, and an inverted T-shaped frame is arranged on each side of the cross beam of the gantry. A motor A is installed at each of the lower ends of one of the T-shaped frames, and each motor A drives a set of unwinding rollers to rotate. The other end of the set of unwinding rollers is movably connected to the lower ends of the two ends of the T-shaped frame on the other side of the gantry; on the inner side of the two T-shaped frames of the gantry, a pair of connecting rods extending upstream are also arranged respectively, and each pair of connecting rods is fixed with an X-axis guide rail; the upper end of the Y-axis guide rail slides and positions in the X-axis guide rail, and the trimming and correction mechanism is fixed on the jaw, and the jaw slides and positions up and down in the Y-axis guide rail; a detection mechanism mounting plate is fixed on one side of the trimming and correction mechanism, and four plug-in type edge detection components are installed at the bottom of the detection mechanism mounting plate. After adjusting the horizontal position, two of the plug-in type edge detection components can be positioned directly above the two plug-in type edge detection components on the slider A and form a one-to-one correspondence relationship. At the same time, the other two plug-in type edge detection components of the detection mechanism mounting plate are positioned directly above the backlight; two opposed photoelectric switches are also arranged on the processing platform, and the two opposed photoelectric switches are arranged in an upstream and downstream relationship, and the connection line of one of them and the plug-in type edge detection component close to the upstream on the slider A is perpendicular to the feeding direction, and the connection line of the other and the plug-in type edge detection component close to the downstream on the slider A is also perpendicular to the feeding direction.

[0011] Preferably, the pluggable edge detection component includes: a columnar main body with a socket at the bottom for docking with the plug on the slider A or the detection mechanism mounting plate. At the top of the main body, there is a CCD camera for receiving light intensity information and converting it into an electrical signal. On one side of the upper part of the main body, there is an inclined spotlight for illuminating the aluminum foil carbon-coated area and the blank area above or below the adjacent pluggable edge detection component. The power supply wires and signal wires of the CCD camera and the spotlight are electrically connected to the socket through the inside of the main body. The pluggable edge detection component may also include: a columnar main body with a socket at the bottom for docking with the plug on the slider A or the detection mechanism mounting plate. At the top of the main body, there is a CCD camera for receiving light intensity information and converting it into an electrical signal. On the upper part of the main body, a square platform is provided around the CCD camera. On the top of the square platform, an annular LED light strip is arranged outside the CCD camera. The top of the LED light strip is inclined inward to facilitate the light to irradiate the carbon-coated area and the blank area of the aluminum foil directly above or below the CCD camera.

[0012] Preferably, the telescopic device includes: a motor B, the shaft end of the motor B drives a lead screw to rotate. The lead screw passes through the through hole on the slider A and is movably connected to the baffle. A lead screw nut is sleeved outside the lead screw and is fixed to one end of the slider A by a bolt. On one side of the slider A away from the motor B, there is a groove, and two plugs arranged in the upstream and downstream directions are provided in the groove. The bottoms of two pluggable edge detection components are inserted into these two plugs for installation. On the side of the slider A close to the motor B, there is a socket A, and the socket A and the plug are electrically connected through the internal wiring of the slider A. On the inner wall of the through groove, there is a socket B, and on the side of the processing platform, there is a socket C. The socket B and the socket C are electrically connected, the socket A and the socket B are electrically connected by a pluggable wire, and the socket C is electrically connected to the control device.

[0013] Preferably, the spreading roller group includes: mounting disks provided at both ends. The outer periphery of the mounting disk is provided with three struts with an included angle of 120° adjacent to each other. The shaft part of the mounting disk is fixed to the rotating shaft of the motor A or is movably connected to both ends of the T-shaped frame. At the end of the strut far from the shaft part of the mounting disk, a flattening roller is fixed. The flattening roller does not rotate by itself, and a rubber layer with a thickness of 1 - 2 cm is provided on the outside of the flattening roller. When the flattening roller rotates to the lowest point, the rubber layer is squeezed by the processing platform, and the thickness of the squeezed part is reduced by 0.5 - 1 cm. Both motors A are stepper motors and rotate in opposite directions during operation.

[0014] Preferably, both the emitting end and the receiving end of the opposed photoelectric switch are provided on the top of the motor B, and the laser emitted by it is tangent to the upper surface of the processing platform.

[0015] Preferably, among the four plug-in type edge detection components installed at the bottom of the detection mechanism mounting plate, they are divided into two groups, namely the upstream group and the downstream group, with two in each group. Among them, the two plug-in type edge detection components in the upstream are in the same plane A as the transmitting end and receiving end of the opposed photoelectric switch in the upstream, and the plug-in type edge detection component on the slider A in the upstream. The two plug-in type edge detection components in the downstream are in the same plane B as the transmitting end and receiving end of the opposed photoelectric switch in the downstream, and the plug-in type edge detection component on the slider A in the downstream. Plane A and plane B are parallel and both plane A and plane B are perpendicular to the feeding direction.

[0016] Preferably, a strip-shaped notch is provided at the front end of the processing platform. A guide roller A is installed in the notch, and a guide roller B is installed on the downstream side of the notch. The top of the guide roller A is higher than the bottom of the guide roller B.

[0017] Preferably, a friction layer is further provided under the unwinding roller group on the processing platform. The friction layer is made of rubber material and is installed in an embedded manner, and its upper surface is at the same horizontal plane as the upper surface of the processing platform.

[0018] Preferably, the control device receives the information of the plug-in type edge detection components and the opposed photoelectric switches, and analyzes the feedback information to send corresponding control instructions to the unwinder, coater, detection and correction integrated machine, and winder. All the detection devices in plane A are regarded as a set of edge detection devices, and all the detection devices in plane B are regarded as a set of edge detection devices. The control device judges faults as follows:

[0019] a. Within 0.5 s - 1 s after the edge detection device in plane A detects a fault code, if the edge detection device in plane B detects normally, the control device determines that the result is normal operation;

[0020] b. Within 0.5 s - 1 s after the edge detection device in plane A detects a fault code, if the detection result of the edge detection device in plane B is the same as the former, the control device determines that the edge detection device in plane A detects a fault code;

[0021] c. Within 0.5 s - 1 s after the edge detection device in plane A detects a fault code, if the detection result of the edge detection device in plane B is different from the former and abnormal, the control device controls the production line to stop for manual inspection to determine the specific fault.

[0022] In the lithium battery aluminum foil coating processing production line of the present invention, when using a set of edge detection devices in plane A or plane B to perform edge detection on the carbon-coated aluminum foil, the following steps are included:

[0023] S1. Use light to irradiate the edges of the carbon-coated area of the aluminum foil being transported from the upper and lower sides, and set a certain point within the irradiated area as the acquisition point. Use a CCD detection device to monitor the voltage generated by the pixels excited by the reflected light of the acquisition point from the upper and lower sides of the aluminum foil. The acquisition point is set to include half of the carbon-coated area and half of the blank area under normal transportation and normal coating conditions of the aluminum foil.

[0024] At the same time, use light to irradiate vertically upward from the lower side of the edge of the aluminum foil being transported, and set a certain point within the irradiated area as the acquisition point. Use a CCD detection device closely arranged with the above CCD detection device to monitor the voltage generated by the pixels excited by the backlight of the acquisition point from the upper side of the aluminum foil. The acquisition point is set to include half of the aluminum foil occlusion area and half of the backlight area under normal transportation conditions of the aluminum foil. The connection line of the two acquisition points on the upper surface of the aluminum foil is perpendicular to the transportation direction of the aluminum foil.

[0025] At the same time, separately arrange the transmitter and receiver of the opposed photoelectric switch on both sides of the aluminum foil. The laser beam emitted by the transmitter is tangent to the upper surface of the aluminum foil. The laser beam is perpendicular to the transportation direction of the aluminum foil and is directly above the acquisition point. The positions of the CCD detection device and the opposed photoelectric switch are set to make the monitoring results synchronous.

[0026] S2. Transmit the monitoring information of the CCD detection device and the opposed photoelectric switch to the control device. The control device analyzes the operation status of the aluminum foil transportation and the coating quality according to the detection information, issues a warning, and controls the operation of the subsequent correction and deviation rectification device.

[0027] Preferably, in step S2, the control device analyzes the operation status of the aluminum foil transportation and the coating quality according to the aluminum foil detection information, including the following steps:

[0028] A1. Take a certain section of aluminum foil with normal coating, pass through the acquisition point in t time, monitor and record the voltage values feedback by each CCD detection device. Among them, take the interval between the maximum and minimum voltage values within t time as the normal value, and the control device assigns 0. If the voltage is less than the normal value and the continuous duration is greater than 0.1 s, then assign 1. If the voltage is greater than the normal value and the continuous duration is greater than 0.1 s, assign 2. Take the assignments of the three CCD detection devices in plane A or plane B as the first, second, and third check bits respectively. Set the receiver receiving light as 0 and not receiving light as 1. The assignment of the receiver is used as the fourth check bit.

[0029] A2. The control device judges the operation status of the coating system according to the check bits generated in step A1. The judgment method is as follows:

[0030] 0000: Normal carbon coating and normal transportation;

[0031] 0001: Normal carbon coating, and there are arches or wrinkles on the aluminum foil surface;

[0032] 0010: Carbon coating is normal, and there is lateral bulge on the edge of the aluminum foil;

[0033] 0020: Carbon coating is normal, and there is a gap on the aluminum foil surface;

[0034] 1000, 0100, 1100: There is too much carbon coating in the carbon coating area and the transportation is normal;

[0035] 1010, 0110, 1110: The carbonized area is over-coated and the edge of the aluminum foil has lateral protrusions;

[0036] 1020, 0120, 1120: There is too much coating in the carbonized area and there are gaps on the edge of the aluminum foil;

[0037] 1001, 0101, 1101: The carbonized area is over-coated and the aluminum foil surface is arched or wrinkled;

[0038] 2000, 0200, 2200: less carbonization in the carbonized area and normal transportation;

[0039] 2010, 0210, 2210: less carbonized area and lateral bulges on the edge of the aluminum foil;

[0040] 2020, 0220, 2220: The carbonized area is less coated and there is a gap on the edge of the aluminum foil;

[0041] 2001, 0201, 2201: The carbonized area is less coated, and the aluminum foil surface is arched or wrinkled;

[0042] 2100, 1200: One side of the carbonized area is less coated and the other side is more coated, and the transportation is normal;

[0043] 2110, 1210: The carbonized area has less coating on one side and more coating on the other side, and the edge of the aluminum foil has lateral protrusions;

[0044] 2100, 1200: The carbonized area has less coating on one side and more coating on the other side, and there is a gap on the edge of the aluminum foil;

[0045] 2101, 1201: The carbonized area has less coating on one side and more coating on the other side, and the aluminum foil surface has arches or wrinkles;

[0046] 1110, 2220: The aluminum foil conveying is offset;

[0047] The last two digits are 11 and 21: one side of the aluminum foil is lifted or bent, and if there is an abnormality in the carbonized area, it is not certain whether the specific factor causing the abnormal carbonization is due to offset or the aluminum foil is not in the same plane, so manual inspection and analysis is required.

[0048] The control device control detection and correction integrated machine has the following working modes when correcting feeding failures:

[0049] 1. Handling wrinkles and folds: The edge trimming and alignment mechanism installed in the Y-axis guide rail is in an initial retracted state, above the foil. Two motors A are turned on, driving two expansion roller groups to rotate in opposite directions relative to each other to simulate the operation of flattening the foil by hand from both sides of the crease. To achieve this operation, the linear speed of the downstream roller group needs to be greater than the feeding speed of the foil. It is better that the linear speed of the upstream roller group can establish reverse tension at a low speed. After a short period of reverse operation of the two roller groups to flatten, the motor A drives the expansion roller group to rotate to an angle where the flattening roller does not contact the processing platform, thus achieving detachment, eliminating the need for an additional lifting device;

[0050] 2. Handling excess carbon coating: The Y-axis guide rail installed in the X-axis guide rail is adjusted to a matching position according to the width of the carbon coating area of the foil. Only one side or both sides of the edge trimming and alignment mechanism are lowered, and the exhaust fan connected to this side of the edge trimming and alignment mechanism is turned on. The excess carbon coating is scraped off and sucked away using its scraper, and then the exhaust fan is turned off, and the edge trimming and alignment mechanism is retracted to complete the operation;

[0051] 3. Handling missing carbon coating: The Y-axis guide rail retracts the edge trimming and alignment mechanism to a preset height. The Y-axis guide rail in the X-axis guide rail is adjusted to a matching position according to the width of the carbon coating area of the foil. Only one side or both sides of the edge trimming and alignment mechanism are lowered, and the hot air blower and spray head connected to this side of the edge trimming and alignment mechanism are turned on. After coating and drying, the spraying is stopped and the hot air blower is turned off, and the edge trimming and alignment mechanism is retracted to complete the operation.

[0052] By combining the detection mechanism that requires X-direction and Y-direction adjustment in the edge detection device with the moving mechanism that can move in the X-direction and Y-direction in the feeding and alignment device, the present invention eliminates the need for additional power devices and power input. And two sets of edge detection devices are arranged on the front side of the expansion mechanism to more rigorously judge the type of fault and filter out false reports of faults. At the same time, for the existing alignment mechanism that requires a lifting mechanism to achieve the contact and detachment between the expansion mechanism and the processing platform, the present invention adopts a new expansion mechanism, that is, three flattening rollers installed on the support rods of the mounting plate, with an included angle of 120° to each other. The flattening rollers only contact the processing platform at the bottom when rotating to the lowest end, and the rubber layer on its surface is squeezed to form a static friction force on the aluminum foil to achieve flattening. This design reduces power consumption and cost input, and the static friction force during the flattening operation will not cause potential damage to the aluminum foil. Compared with the existing equipment, the detection result of the present invention is more accurate, and it is convenient to cooperate with the feeding and alignment device to realize automatic error correction in the aluminum foil carbon coating processing. The present invention has a high yield rate of carbon-coated aluminum foil, good product consistency, low technical requirements for the coating equipment, small floor area, low equipment cost, and energy saving, showing significant technological progress in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a three-dimensional view of the detection and alignment integrated machine.

[0054] Figure 2 Schematic diagram of the installation plate for the detection mechanism

[0055] Figure 3 Front view of the integrated detection and calibration machine

[0056] Figure 4 Top view of the integrated detection and calibration machine

[0057] Figure 5 Stereogram of the telescopic device

[0058] Figure 6 Stereogram of the unfolding roller group

[0059] Figure 7 Stereogram of a plug-in type edge detection component

[0060] Figure 8 Front view of a plug-in type edge detection component

[0061] Figure 9 Schematic structural diagram of the present invention

[0062] In the figure: 1. Processing platform; 2. Gantry; 3. Notch; 4. Through groove; 5. Guide roller A; 6. Guide roller B; 7. Motor B; 8. Opposite type photoelectric switch; 9. Jack C; 10. Lead screw; 11. Slide block A; 12. Backlight; 13. Baffle; 14. Plug-in type edge detection component; 15. Installation plate for the detection mechanism; 16. Jack B; 17. Trimming and calibration mechanism; 18. Claw; 19. Y-axis guide rail; 20. X-axis guide rail; 21. Connecting rod; 22. T-shaped frame; 23. Motor A; 24. Flattening roller; 25. Guide roller C; 26. CCD camera; 27. Spot lamp; 28. Support rod; 29. Groove; 30. Lead screw nut; 31. Jack A; 32. Square platform; 33. LED light strip; 34. Socket; 35. Unwinder; 36. Coater; 37. Control device; 38. Integrated detection and calibration machine; 39. Rewinder Specific implementation mode

[0063] Example 1, as Figures 1-9As shown in the figure, the aluminum foil coating processing production line of the present invention includes: an unwinder 35, a coater 36, an inspection and correction integrated machine 38, a winder 39 arranged in sequence from upstream to downstream, and a control device 37 that connects and controls the above-mentioned devices. In the following orientation descriptions, the upstream refers to the direction close to the unwinder 35, and the downstream refers to the direction close to the winder 39; the inspection and correction integrated machine 38 includes: a processing platform 1. A guiding roller A5 and a guiding roller B6 are provided at the front end of the processing platform 1, and a guiding roller C25 is provided at the rear end. The bottoms of the guiding roller B6 and the guiding roller C25 are tangent to the upper surface of the processing platform 1, which can ensure that the aluminum foil travels on the upper surface of the processing platform 1; a through groove 4 perpendicular to the feeding direction is provided on the upstream side of the processing platform 1. A telescopic device is provided at each end of the through groove 4. Each telescopic device drives a slider A11 to slide in the through groove 4. A backlight 12 is installed on one side of the slider A11 close to the edge of the processing platform 1, and two plug-in type edge detection components 14 are installed on the side close to the center line of the processing platform 1. One of the plug-in type edge detection components 14 is close to the upstream, and the other is close to the downstream. This design enables the plug-in type edge detection components 14 to adjust the position in the X-axis direction according to the width of the aluminum foil and the width of the carbon coating area, so as to ensure that the backlight 12 is below the edge of the aluminum foil and the plug-in type edge detection components 14 are below the edge of the carbon coating, so as to perform edge detection. In this case, the X-axis refers to the axis that is horizontal and perpendicular to the feeding direction, and the Y-axis refers to the axis perpendicular to the upper surface of the processing platform 1; a gantry 2 is provided in the middle section of the processing platform 1. An inverted T-shaped frame 22 is provided on each side of the cross beam of the gantry 2. A motor A23 is installed at each of the lower ends of one of the T-shaped frames 22. Each motor A23 drives a set of spreading rollers to rotate. The other end of the set of spreading rollers is movably connected to the lower ends of the two ends of the T-shaped frame 22 on the other side of the gantry 2. In this example, the movable connection uses a bearing connection to reduce wear; on the inner side of the two T-shaped frames 22 of the gantry 2, a pair of connecting rods 21 extending upstream are respectively provided. Each pair of connecting rods 21 is fixed with an X-axis guide rail 20; the upper end of the Y-axis guide rail 19 slides and positions in the X-axis guide rail 20, that is, it is fixed to the lower part of the slider B of the X-axis guide rail 20. The trimming and correction mechanism 17 is fixed to the jaw 18. The jaw 18 slides and positions up and down in the Y-axis guide rail 19, that is, the jaw 18 is fixed to the slider C of the Y-axis guide rail 19; a detection mechanism mounting plate 15 is fixed on one side of the trimming and correction mechanism 17. Four plug-in type edge detection components 14 are installed at the bottom of the detection mechanism mounting plate 15. After adjusting the horizontal position, that is, adjusting the position of the X-axis guide rail 20, two of the plug-in type edge detection components 14 can be made to be directly above the two plug-in type edge detection components 14 on the slider A11 and form a one-to-one correspondence. At the same time, the other two plug-in type edge detection components 14 of the detection mechanism mounting plate 15 are directly above the backlight 12 for detecting the edge of the aluminum foil;The processing platform 1 is also provided with two opposed photoelectric switches 8. The two opposed photoelectric switches 8 are arranged in an upstream and downstream relationship, and the connection line of one of them and the plug-in edge detection component 14 near the upstream on the slider A11 is perpendicular to the feeding direction, and the connection line of the other and the plug-in edge detection component 14 near the downstream on the slider A11 is also perpendicular to the feeding direction.

[0064] Embodiment 2. The plug-in edge detection component 14 of the present invention includes: as Figure 2 shown, it has a columnar main body. A socket 34 is provided at the bottom of the main body for docking with the plug on the slider A11 or the detection mechanism mounting plate 15. A CCD camera 26 for receiving light intensity information and converting it into an electrical signal is provided at the top of the main body. An inclined spotlight 27 is provided on one side of the upper part of the main body for illuminating the carbon-coated area and the blank area of the aluminum foil above or below the adjacent plug-in edge detection component 14. The power supply wires and signal wires of the CCD camera 26 and the spotlight 27 are electrically connected to the socket 34 from the inside of the main body. Of course, in order to save space, the spotlight 27 may not protrude from the surface of the main body; the plug-in edge detection component 14 may also include: as Figure 7 、 Figure 8 shown, it has a columnar main body. A socket 34 is provided at the bottom of the main body for docking with the plug on the slider A11 or the detection mechanism mounting plate 15. A CCD camera 26 for receiving light intensity information and converting it into an electrical signal is provided at the top of the main body. A square platform 32 is provided on the upper part of the main body around the CCD camera 26. On the top of the square platform 32, an annular LED light strip 33 is arranged outside the CCD camera 26. The top of the LED light strip 33 is inclined inward. The square platform 32 is provided to facilitate inclining and converging the irradiation direction of the arranged surrounding light strip inward, so as to facilitate the light to irradiate the carbon-coated area and the blank area of the aluminum foil directly above or below the CCD camera 26. Figure 7 、 Figure 8 In the shown scheme, since it illuminates directly above or below, when the height of the detection mechanism mounting plate 15 is adjusted by the Y-axis guide rail 19, the irradiation position will not deviate.

[0065] Embodiment 3. As Figure 1 、 Figure 5As shown in the figure, the telescopic device of the present invention includes: a motor B7, the shaft end of the motor B7 drives the screw rod 10 to rotate, the screw rod 10 passes through the through hole on the slider A11 and is movably connected to the baffle 13, the screw rod nut 30 is sleeved outside the screw rod 10 and is fixed to one end of the slider A11 by a bolt; a groove 29 is provided on the side of the slider A11 away from the motor B7, and two plugs arranged in the upstream and downstream directions are provided in the groove 29, and the bottoms of the two plug-in type opposite side detection components 14 are inserted into these two plugs for installation; a socket A31 is provided on the side of the slider A11 close to the motor B7, and the socket A31 and the plug are electrically connected through the internal wiring of the slider A11; a socket B16 is provided on the inner wall of the through groove 4, and a socket C9 is provided on the side of the processing platform 1, the socket B16 and the socket C9 are electrically connected, the socket A31 and the socket B16 are electrically connected by a pluggable wire, and the socket C9 is electrically connected to the control device 37, forming a control path via the control device 37, the socket C9, the socket B, the socket A31, the plug, and the plug-in type opposite side detection component 14, reducing the exposed wires and being more beautiful and safe.

[0066] Example 4, as Figure 1 , Figure 3 , Figure 4 As shown in the figure, the unfolding roller group of the present invention includes: mounting disks provided at both ends, three struts 28 with an adjacent included angle of 120° are provided on the outer periphery of the mounting disks, the shaft part of the mounting disk is fixed to the rotating shaft of the motor A23 or is movably connected to both ends of the T-shaped frame 22; a flattening roller 24 is fixed to one end of the strut 28 far from the shaft part of the mounting disk, the flattening roller 24 does not rotate by itself, and a rubber layer with a thickness of 1-2 cm is provided on the outside of the flattening roller 24. When the flattening roller 24 rotates to the lowest point, the rubber layer is squeezed by the processing platform 1, and the thickness of the squeezed part is reduced by 0.5-1 cm; both motors A23 are stepping motors and rotate in opposite directions during operation.

[0067] In Example 5, the emitting end and the receiving end of the opposed photoelectric switch 8 are both provided on the top of the motor B7, and the laser emitted by it is tangent to the upper surface of the processing platform 1.

[0068] Example 6. Among the four plug-in type edge detection components 14 installed at the bottom of the detection mechanism mounting plate 15, they are divided into two groups, namely the upstream group and the downstream group, with two in each group. Among them, the two plug-in type edge detection components 14 in the upstream are in the same plane A as the emission end and the receiving end of the transmissive photoelectric switch 8 in the upstream, and the plug-in type edge detection component 14 on the slider A11 in the upstream, which is equivalent to five points being coplanar; the two plug-in type edge detection components 14 in the downstream are in the same plane B as the emission end and the receiving end of the transmissive photoelectric switch 8 in the downstream, and the plug-in type edge detection component 14 on the slider A11 in the downstream, which is also equivalent to five points being coplanar. Plane A and plane B are parallel and both plane A and plane B are perpendicular to the feeding direction, so as to form two sets of edge detection devices to filter out the judgment errors caused by accidental mechanical changes in a single set of edge detection devices. In practical applications, if the distance between plane A and plane B is too close, there will be almost no deviation in their judgment results; if the distance is too far, it will affect the positioning of the defect position by the correction mechanism. In this example, the distance between plane A and plane B is set to 30 cm, which can achieve better results.

[0069] Example 7. A strip-shaped notch 3 is provided at the front end of the processing platform 1. A guide roller A5 is installed in the notch 3, and a guide roller B6 is installed on the downstream side of the notch 3. The top of the guide roller A5 is higher than the bottom of the guide roller B6.

[0070] Example 8. A friction layer is further provided under the unwinding roller group of the processing platform 1. The friction layer is made of rubber material and is installed in an embedded manner, and its upper surface is at the same horizontal plane as the upper surface of the processing platform 1.

[0071] Example 9. In the lithium battery aluminum foil coating processing production line of the present invention, a set of edge detection device in plane A or plane B is used to perform edge detection on the carbon-coated aluminum foil, including the following steps:

[0072] S1. Use light to irradiate the edges of the carbon-coated area of the aluminum foil being conveyed from the upper and lower sides, and set a certain point in the irradiation area as the acquisition point. Use a CCD detection device to monitor the voltage generated by the pixels excited by the reflected light of the acquisition point from the upper and lower sides of the aluminum foil. The acquisition point is set to include half of the carbon-coated area and half of the blank area under the normal conveying and normal coating states of the aluminum foil;

[0073] At the same time, use light to irradiate directly upward from the lower side of the edge of the aluminum foil being conveyed, and set a certain point in the irradiation area as the acquisition point. Use a CCD detection device closely arranged with the above CCD detection device to monitor the voltage generated by the pixels excited by the backlight of the acquisition point from the upper side of the aluminum foil. The acquisition point is set to include half of the aluminum foil shielding area and half of the backlight area under the normal conveying state of the aluminum foil. The connection line of the two acquisition points on the upper surface of the aluminum foil is perpendicular to the conveying direction of the aluminum foil;

[0074] Meanwhile, the emitter and receiver of the opposed photoelectric switch are respectively arranged on both sides of the aluminum foil. The laser beam emitted by the emitter is tangent to the upper surface of the aluminum foil. The laser beam is perpendicular to the conveying direction of the aluminum foil and is directly above the collection point. The positions of the CCD detection device and the opposed photoelectric switch are set to synchronize the monitoring results;

[0075] S2. The monitoring information of the CCD detection device and the opposed photoelectric switch is transmitted to the control device. The control device analyzes the operation status of the aluminum foil conveying and the coating quality according to the detection information, issues a warning, and controls the operation of the subsequent correction and deviation rectification device.

[0076] Example 10. The control device 37 receives the information of the plug-in edge detection component 14 and the opposed photoelectric switch 8, and analyzes the feedback information to issue corresponding control instructions to the unwinder 35, the coater 36, the detection and correction integrated machine 38, and the winder 39. All the detection devices in plane A are regarded as a set of edge detection devices, and all the detection devices in plane B are regarded as a set of edge detection devices. The control device 37 judges faults as follows:

[0077] a. Within 0.5 s - 1 s after the edge detection device in plane A detects a fault code, this time is determined according to the distance between plane A and plane B and the feeding speed. If the edge detection device in plane B detects normally, the control device 37 determines that the result is normal operation to filter out the influence of accidental changes;

[0078] b. Within 0.5 s - 1 s after the edge detection device in plane A detects a fault code, if the detection result of the edge detection device in plane B is the same as the former, the control device 37 determines that the edge detection device in plane A detects a fault code, and the double - determination fault is more accurate;

[0079] c. Within 0.5 s - 1 s after the edge detection device in plane A detects a fault code, if the detection result of the edge detection device in plane B is different from the former and abnormal, the control device 37 controls the production line to stop for manual inspection to determine the specific fault. Since the edge detection device in the downstream has a higher weight, it is more necessary to use manual determination when it is uncertain whether the fault is affected by accidental changes.

[0080] Example 11. In step S2 described in Example 9, the control device analyzes the operation status of the aluminum foil conveying and the coating quality according to the aluminum foil detection information, including the following steps:

[0081] A1. Take a section of normally coated aluminum foil, pass it through the collection point within time t, and monitor and record the voltage values fed back by each CCD detection device. Among them, the interval of the maximum and minimum voltage values within time t is taken as the normal value, and the control device assigns 0. If the voltage is less than the normal value and the duration is greater than 0.1 s, then assign 1. If the voltage is greater than the normal value and the duration is greater than 0.1 s, assign 2. The assignments of the three CCD detection devices in plane A or plane B are respectively used as the first, second, and third check bits. The receiver receiving light is set to 0, and not receiving light is set to 1. The assignment of the receiver is used as the fourth check bit;

[0082] A2. The control device judges the operation status of the coating system according to the check bits generated in step A1. The judgment method is as follows:

[0083] 0000: The carbon coating is normal and the conveying is normal;

[0084] 0001: The carbon coating is normal, and there are arches or wrinkles on the aluminum foil surface;

[0085] 0010: The carbon coating is normal, and there are lateral protrusions on the aluminum foil edge;

[0086] 0020: The carbon coating is normal, and there are notches on the aluminum foil surface;

[0087] 1000, 0100, 1100: There is overcoating in the carbon coating area and the conveying is normal;

[0088] 1010, 0110, 1110: There is overcoating in the carbon coating area, and there are lateral protrusions on the aluminum foil edge;

[0089] 1020, 0120, 1120: There is overcoating in the carbon coating area, and there are notches on the aluminum foil edge;

[0090] 1001, 0101, 1101: There is overcoating in the carbon coating area, and there are arches or wrinkles on the aluminum foil surface;

[0091] 2000, 0200, 2200: There is undercoating in the carbon coating area and the conveying is normal;

[0092] 2010, 0210, 2210: There is undercoating in the carbon coating area, and there are lateral protrusions on the aluminum foil edge;

[0093] 2020, 0220, 2220: There is undercoating in the carbon coating area, and there are notches on the aluminum foil edge;

[0094] 2001, 0201, 2201: There is undercoating in the carbon coating area, and there are arches or wrinkles on the aluminum foil surface;

[0095] 2100, 1200: There is undercoating on one side and overcoating on the other side in the carbon coating area and the conveying is normal;

[0096] 2110, 1210: There is undercoating on one side and overcoating on the other side in the carbon coating area, and there are lateral protrusions on the aluminum foil edge;

[0097] 2100, 1200: The carbonized area has less coating on one side and more coating on the other side, and there is a gap on the edge of the aluminum foil;

[0098] 2101, 1201: The carbonized area has less coating on one side and more coating on the other side, and the aluminum foil surface has arches or wrinkles;

[0099] 1110, 2220: The aluminum foil conveying is offset;

[0100] The last two digits are 11 and 21: one side of the aluminum foil is lifted or bent, and if there is an abnormality in the carbonized area, it is not certain whether the specific factor causing the abnormal carbonization is due to offset or the aluminum foil is not in the same plane, so manual inspection and analysis is required.

[0101] Embodiment 12, the control device controls the detection and correction integrated machine to have the following working modes when correcting a feeding failure:

[0102] 1. Dealing with wrinkles and folds: The trimming and correction mechanism installed in the Y-axis guide rail is in the initial retracted state, located above the foil. The two motors A are turned on to drive the two unfolding rollers to rotate in opposite directions to simulate the operation of flattening the foil from both sides of the crease by hand. To achieve this operation, the linear speed of the downstream roller group must be greater than the foil feeding speed, and the linear speed of the upstream roller group should be low enough to establish reverse tension. After a short period of flattening by the two roller groups in reverse operation, the motor A drives the unfolding roller group to rotate to an angle where the flattening rollers are not in contact with the processing platform, thus achieving separation, eliminating the need for additional lifting devices;

[0103] 2. Dealing with excess carbon coating: The Y-axis guide rail installed in the X-axis guide rail is adjusted to a matching position according to the width of the carbon coating area of ​​the foil, and only one or both sides of the trimming and correction mechanism are lowered, and the exhaust fan connected to the trimming and correction mechanism on that side is turned on, and the excess carbon coating is scraped off and sucked away with its scraper, and then the exhaust fan is turned off and the trimming and correction mechanism is folded to complete the operation;

[0104] 3. Dealing with missing carbon coating: The Y-axis guide rail will retract the trimming correction mechanism to the preset height, and the Y-axis guide rail in the X-axis guide rail is adjusted to a matching position according to the width of the carbon-coated area of ​​the foil. Only one or both sides of the trimming correction mechanism are lowered, and the hot air blower and nozzle connected to the trimming correction mechanism on that side are turned on. After coating and drying, stop spraying and turn off the hot air blower, and retract the trimming correction mechanism to complete the operation.

[0105] It should also be noted that the trimming and correction mechanism involved in the present invention is a prior art, which includes auxiliary equipment that can realize its spraying, drying and suction functions. These auxiliary equipment and the plug-in edge detection components and motor A installed on the detection mechanism mounting plate are electrically connected to the control device and controlled by it.

[0106] In the present invention, the detection mechanism that needs to be adjusted in the X and Y directions in the edge detection device is combined with the moving mechanism that can move in the X and Y directions in the feeding correction device, eliminating the need for additional power devices and power input. In addition, two sets of edge detection devices are provided on the front side of the unfolding mechanism to more rigorously judge the type of faults and filter out false alarms of faults. At the same time, for the existing correction mechanism that requires a lifting mechanism to realize the contact and separation between the unfolding mechanism and the processing platform, a new unfolding mechanism is adopted, that is, three flattening rollers installed on the support rods of the mounting plate, with an included angle of 120° with each other. The flattening rollers only contact the processing platform at the bottom when rotating to the lowest point, and the rubber layer on their surfaces is squeezed to form a static friction force on the aluminum foil to achieve flattening. This design reduces power consumption and cost investment, and the static friction force during flattening operation will not cause potential damage to the aluminum foil. Compared with the existing equipment, the present invention has more accurate detection results, is convenient to cooperate with the feeding correction device to realize automatic error correction in the aluminum foil carbon coating process. The present invention has a high yield of carbon-coated aluminum foil products, good product consistency, low technical requirements for coating equipment, small floor area, low equipment cost, and energy saving, showing significant technological progress in the field.

[0107] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aluminum foil coating processing production line for lithium batteries, characterized in that: Including: An unwinder, a coater, an inspection and correction integrated machine, a rewinder arranged in sequence from upstream to downstream, and a control device for connecting and controlling the above-mentioned devices; The integrated detection and correction machine includes: a processing platform. At the front end of the processing platform, there are guide rollers A and B, and at the rear end, there is a guide roller C. The bottoms of the guide rollers B and C are tangent to the upper surface of the processing platform. On one side upstream of the processing platform, there is a through groove perpendicular to the feeding direction. At both ends of the through groove, there is a telescopic device respectively. Each telescopic device drives a slider A to slide in the through groove. On one side of the slider A close to the edge of the processing platform, there is a backlight, and on the side close to the center line of the processing platform, there are two plug-in type edge detection components. One of the plug-in type edge detection components is close to the upstream, and the other is close to the downstream. In the middle section of the processing platform, there is a gantry. On both sides of the cross beam of the gantry, there is an inverted T-shaped frame respectively. At both lower ends of one of the T-shaped frames, there is a motor A respectively. Each motor A drives a set of spreading rollers to rotate. The other end of the set of spreading rollers is movably connected to both lower ends of the T-shaped frame on the other side of the gantry. On the inner side of the two T-shaped frames of the gantry, there is also a pair of connecting rods extending upstream respectively. Each pair of connecting rods is fixed with an X-axis guide rail. The upper end of the Y-axis guide rail slides and positions in the X-axis guide rail. The trimming and correction mechanism is fixed on the clamping jaw. The clamping jaw slides and positions up and down in the Y-axis guide rail. On one side of the trimming and correction mechanism, there is a detection mechanism mounting plate. At the bottom of the detection mechanism mounting plate, there are four plug-in type edge detection components. After adjusting the horizontal position, two of the plug-in type edge detection components can be positioned directly above the two plug-in type edge detection components on the slider A and form a one-to-one correspondence relationship. At the same time, the other two plug-in type edge detection components of the detection mechanism mounting plate are positioned directly above the backlight. The processing platform also has two opposed photoelectric switches. The two opposed photoelectric switches are arranged in an upstream and downstream relationship. One of them is perpendicular to the feeding direction when connected to the plug-in type edge detection component on the slider A close to the upstream, and the other is also perpendicular to the feeding direction when connected to the plug-in type edge detection component on the slider A close to the downstream. The plug-in type edge detection component includes: a columnar main body. At the bottom of the main body, there is a socket for docking with the plug on the slider A or the detection mechanism mounting plate. At the top of the main body, there is a CCD camera for receiving the light intensity information and converting it into an electrical signal. On one side of the upper part of the main body, there is an obliquely arranged spotlight for illuminating the carbon-coated area and the blank area of the aluminum foil above or below the adjacent plug-in type edge detection component. The power supply wires and signal wires of the CCD camera and the spotlight are electrically connected to the socket from the inside of the main body. Or the plug-in type edge detection component includes: a columnar main body. At the bottom of the main body, there is a socket for docking with the plug on the slider A or the detection mechanism mounting plate. At the top of the main body, there is a CCD camera for receiving the light intensity information and converting it into an electrical signal. On the upper part of the main body, there is a square platform around the CCD camera. At the top of the square platform, there is an annular LED light strip arranged around the outer circle of the CCD camera. The top of the LED light strip is inclined inward to facilitate the light to irradiate the carbon-coated area and the blank area of the aluminum foil directly above or below the CCD camera.The unfolding roller set includes: mounting discs provided at both ends, the mounting discs are provided with three struts with an adjacent included angle of 120°, the shaft part of the mounting disc is fixedly connected to the rotating shaft of motor A or movably connected to both ends of the T-shaped frame; a flattening roller is fixed to one end of the strut far from the shaft part of the mounting disc, the flattening roller does not rotate by itself, and a rubber layer with a thickness of 1-2 cm is provided on the outer side of the flattening roller. When the flattening roller rotates to the lowest point, the rubber layer is squeezed by the processing platform, so that the thickness of the squeezed part is reduced by 0.5-1 cm; both motors A are stepper motors and rotate in opposite directions during operation.

2. The lithium battery aluminum foil coating processing production line according to claim 1, wherein: The telescopic device includes a motor B. The shaft end of the motor B drives a lead screw to rotate. The lead screw passes through a through-hole baffle on the slider A and is movably connected. A lead screw nut is sleeved outside the lead screw and is fixed to one end of the slider A by a bolt. On the side of the slider A away from the motor B, there is a groove. Inside the groove, there are two plugs arranged in the upstream and downstream directions. The bottoms of two plug-in type edge detection components are inserted into these two plugs for installation. On the side of the slider A close to the motor B, there is a jack A. The jack A is electrically connected to the plug through internal wiring of the slider A. On the inner wall of the through groove, there is a jack B. On the side of the processing platform, there is a jack C. The jack B is electrically connected to the jack C. The jack A is electrically connected to the jack B through a pluggable wire. The jack C is electrically connected to the control device.

3. The lithium battery aluminum foil coating processing production line according to claim 2, wherein: The emitting end and the receiving end of the opposed photoelectric switch are both arranged on the top of the motor B, and the laser emitted by it is tangent to the upper surface of the processing platform.

4. The lithium battery aluminum foil coating processing production line according to claim 3, characterized in that: Among the four plug-in type edge detection components installed at the bottom of the inspection mechanism mounting plate, they are divided into two groups, upstream and downstream, with two in each group. Among them, the two plug-in type edge detection components in the upstream are in the same plane A as the emitting end and the receiving end of the opposed photoelectric switch in the upstream, and the plug-in type edge detection component in the upstream on the slider A; the two plug-in type edge detection components in the downstream are in the same plane B as the emitting end and the receiving end of the opposed photoelectric switch in the downstream, and the plug-in type edge detection component in the downstream on the slider A. The plane A and the plane B are parallel and both the plane A and the plane B are perpendicular to the feeding direction.

5. The lithium battery aluminum foil coating processing production line according to claim 4, characterized in that: At the front end of the processing platform, there is a strip-shaped notch. A guide roller A is installed in the notch, and a guide roller B is installed on the downstream side of the notch. The top of the guide roller A is higher than the bottom of the guide roller B.

6. The lithium battery aluminum foil coating processing production line according to claim 5, wherein: Below the unwinding roller group on the processing platform, there is also a friction layer. The friction layer is made of rubber material and is installed in an embedded manner. Its upper surface is in the same horizontal plane as the upper surface of the processing platform.

7. The lithium battery aluminum foil coating processing production line according to claim 6, wherein: The control device receives the information of the plug-in type edge detection components and the opposed photoelectric switch, analyzes the feedback information, and issues corresponding control instructions to the unwinder, coater, inspection and correction integrated machine, and rewinder. All the detection devices in the plane A are regarded as a set of edge detection devices, and all the detection devices in the plane B are regarded as a set of edge detection devices. The control device judges faults as follows: a. Within 0.5 s - 1 s after the edge detection device in the plane A detects a fault code, if the edge detection device in the plane B detects normally, the control device determines that the result is normal operation; b. Within 0.5 s - 1 s after the edge detection device in the plane A detects a fault code, if the detection result of the edge detection device in the plane B is the same as the former, the control device determines that the edge detection device in the plane A detects a fault code; c. Within 0.5 s - 1 s after the edge detection device in the plane A detects a fault code, if the detection result of the edge detection device in the plane B is different from the former and abnormal, the control device controls the production line to stop for manual inspection to determine the specific fault.

Images