Charge coupled device (CCD) processing device for lithium battery lamination process

Abstract

The invention discloses a CCD (Charge Coupled Device) processing device for a lithium battery lamination process. The CCD processing device comprises a fixed plate; the diaphragm unwinding roller is arranged at one end of the front surface of the fixed plate so as to unwind the diaphragm; the membrane pulling assembly is arranged in the middle of the front surface of the fixing plate so as to pull the membrane to move, and a roller guide assembly is arranged between the membrane pulling assembly and the membrane unwinding roller; the lamination mechanism is arranged at the lower end of the front surface of the fixed plate and is used for laminating the diaphragms; at least two CCD cameras; according to the utility model, the diaphragm can swing left and right relative to the lamination table through the diaphragm drawing assembly, the diaphragm on the lamination table is alternately pressed through the two groups of pressing knife assemblies on the lamination table to complete Z-shaped lamination, and the two CCD cameras, the light source and the infrared sensor are arranged to photograph the pole pieces in the positive and negative pole piece material areas before the mechanical arm works, so that the working efficiency of the mechanical arm is improved. Whether the pole piece has defects and the area of the defects are judged, and the risk that the pole piece is stacked into the stacked core is eliminated.

Description

Technical Field

[0001] The present invention specifically relates to a CCD processing device for a lithium battery lamination process. Background Art

[0002] The stacking machine is suitable for the stacking process of square lithium-ion batteries. It adopts a Z-shaped stacking method, and finally forms a multi-layer stacking structure with "diaphragm-positive electrode-diaphragm-negative electrode" as the unit. The existing stacking machine has three CCD detection systems: the pole piece defect CCD detection system, that is, the computer determines whether it needs to be discharged later by analyzing and calculating the area of ​​defects on the front and back sides of the pole piece; the pole piece size CCD detection system, that is, the computer grabs the measurement edge according to the obvious grayscale difference presented by the different reflective values ​​of the foil and the material area. Various measurement edges can be combined to measure the pole piece size data such as the width and height of the pole ear, so as to discharge the abnormal pole piece; the overhang detection system on the stacking table, that is, by grabbing the required diaphragm edge, negative electrode edge and positive electrode edge to measure the core stacking coating. If there is an abnormality, the machine will alarm and discharge the abnormal pole piece.

[0003] The pole piece defect CCD detection system and the pole piece size CCD detection system are uniformly discharged at the subsequent inverted belt. If the inverted belt has abnormal vacuum absorption or other problems, the abnormal pole pieces will not be discharged normally, but will flow to the next stacking process. In this way, even if there is an overhang detection system on the stacking table, only some abnormal pole pieces will be discharged. However, some abnormal pole pieces with large defects in the material area or folded pole pieces will be stacked into the stacking core as normal pole pieces, causing many problems such as poor ear alignment, short circuit and lithium precipitation, which is not convenient for ensuring product yield. For this reason, we propose a CCD processing device for the lithium battery stacking process. Summary of the invention

[0004] The purpose of the present invention is to provide a CCD processing device for a lithium battery lamination process, so as to solve the problem that the existing lamination process mentioned in the above background technology is not convenient for detecting the defects of the pole pieces of the previous process, resulting in a low yield rate after lamination.

[0005] To achieve the above object, the present invention provides the following technical solution: a CCD processing device for a lithium battery lamination process, comprising:

[0006] Fixed plate;

[0007] A diaphragm unwinding roller is arranged at one end of the front surface of the fixed plate to unwind the diaphragm;

[0008] A film pulling assembly is arranged in the middle of the front surface of the fixed plate to pull the diaphragm to move, and a roller guide assembly is arranged between the film pulling assembly and the diaphragm unwinding roller;

[0009] A lamination mechanism is arranged at the lower end of the front surface of the fixed plate to laminate the diaphragm;

[0010] At least two CCD cameras are symmetrically arranged on the front surface of the fixed plate, and the shooting ports of the CCD cameras face the lamination mechanism;

[0011] The light source is arranged at the lower end of the front surface of the fixing plate to illuminate the lamination mechanism during shooting.

[0012] It is convenient to illuminate with two CCD cameras and light sources, photograph and identify the pole pieces during lamination, eliminate defects when they exist, and perform lamination when there are no defects, thereby improving product quality. In addition, the diaphragms can be well stretched during lamination to ensure the neatness of the diaphragms.

[0013] Preferably, the film pulling assembly includes a first positioning clamping rod, a second positioning clamping rod, a sliding plate, a guide rail and a linear drive mechanism. The sliding plate is arranged on the front surface of the fixed plate, and the front surface of the fixed plate is provided with a guide rail that slides with the sliding plate. Two second positioning clamping rods are symmetrically arranged on the front surface of the sliding plate, and a first positioning clamping rod for feeding material to the second positioning clamping rod is symmetrically arranged in the middle part of the front surface of the fixed plate. A linear drive mechanism is connected to the sliding plate to drive it to move left and right.

[0014] It is convenient to stack the diaphragms in a Z shape when stacking, which ensures that the surface of the diaphragm is flat, reduces the occurrence of wrinkles, and drives the diaphragm to move well.

[0015] Preferably, the linear drive mechanism includes a driving nut, a screw, a second motor and a support. The screw is rotatably mounted on the front surface of the fixed plate through supports at both ends, and a driving nut is sleeved on the outer surface of the screw. The driving nut is fixed to the sliding plate. A second motor is provided at one end of the screw, and the second motor is fixedly connected to the fixed plate.

[0016] It is convenient to drive the sliding plate to move back and forth, thereby realizing Z-shaped stacking of the diaphragms. The threaded joints of the screw rod and the driving nut improve the fine movement effect of the sliding plate and ensure the accuracy of the diaphragm stacking.

[0017] Preferably, the sliding plate is rectangular, and the outer diameter of the second positioning clamping rod is greater than the outer diameter of the first positioning clamping rod.

[0018] It is convenient to adjust and stack the diaphragm. At the same time, the second positioning clamp with a larger outer diameter is helpful to ensure the flatness of the diaphragm surface and reduce the situation where the diaphragm is wrinkled due to the small outer diameter.

[0019] Preferably, the stacking mechanism includes a stacking platform, a knife pressing assembly and an infrared sensor. The stacking platform is fixed to the lower end of the front surface of the fixed plate. Two knife pressing assemblies are symmetrically arranged on the stacking platform, and an infrared sensor for detecting the movement of the knife pressing assembly is arranged on one side of the knife pressing assembly.

[0020] It is convenient to detect the movement of the knife pressing assembly through the infrared sensor, so as to avoid stacking defects caused by the knife pressing assembly not working during stacking, which is beneficial to ensure the quality of the product.

[0021] Preferably, the roller guide assembly includes a front guide roller, a tension mechanism and a rear guide roller. The tension mechanism is arranged at the upper end of the front surface of the fixed plate, and a front guide roller is provided between the tension mechanism and the diaphragm unwinding roller. The rear guide roller is arranged between the tension mechanism and the film pulling assembly to guide the diaphragm.

[0022] It is convenient to better guide the movement of the diaphragm and to tension the diaphragm during the guiding process to avoid wrinkles caused by relaxation and improve the flatness of the diaphragm.

[0023] Preferably, two front guide roller wheels are provided.

[0024] This facilitates better guiding effect on the diaphragm.

[0025] Preferably, the tension mechanism includes a first tensioning wheel, a mounting plate, a connecting rod, a first guide roller and a second guide roller. The connecting rod is rotatably mounted on the front surface of the fixed plate, and a servo motor for driving the connecting rod to deflect is provided on the rear surface of the fixed plate corresponding to the connecting rod. Mounting plates are fixed at both ends of the connecting rod, and the first tensioning wheel is rotatably mounted on the front surface of the mounting plate. The first guide roller and the second guide roller are staggered and arranged on both sides of the connecting rod.

[0026] It is convenient to tension the diaphragm to avoid the diaphragm loosening which will cause wrinkles when stacked later and affect the quality of the product.

[0027] Preferably, the CCD camera is a tilting structure, and one end of the CCD camera cooperates with a fixed plate through a rotating damper to adjust the tilt angle of the CCD camera.

[0028] It is convenient to adjust the direction of the CCD camera in the later stage so that it can be better aimed at the pole piece to photograph and identify the pole piece.

[0029] Preferably, the number of the light sources is the same as the number of CCD cameras.

[0030] This is convenient for ensuring the lighting effect, thereby facilitating better image acquisition of the positive electrode sheet area and the negative electrode sheet area.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This patent realizes the left and right swing of the diaphragm relative to the stacking table through the film pulling assembly, and alternately presses the diaphragm on the stacking table through two sets of pressing knife assemblies on the stacking table. The external robotic arm takes out the positive and negative electrode sheets from the positive and negative electrode sheet material area and stacks them alternately on both sides of the diaphragm to complete the Z-type stacking. By setting two CCD cameras, light sources and infrared sensors, the electrode sheets in the positive and negative electrode sheet material area are photographed before the robotic arm starts working to determine whether the electrode sheets have defects and the area of ​​the defects, thereby eliminating the risk of electrode sheets stacked into the stacking core and better ensuring the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 It is a schematic diagram of the tension mechanism structure of the present invention.

[0035] In the figure: 1. diaphragm unwinding roller; 2. roller guide assembly; 2-1. front guide roller; 2-2. tension mechanism; 2-21. first tensioning wheel; 2-22. mounting plate; 2-23. connecting rod; 2-24. first guide roller; 2-25. second guide roller; 2-3. rear guide roller; 3. film pulling assembly; 3-1. first positioning clamping rod; 3-2. second positioning clamping rod; 3-3. sliding plate; 3-4. guide rail; 4. lamination mechanism; 4-1. lamination table; 4-2. knife pressing assembly; 4-3. infrared sensor; 5. fixing plate; 6. CCD camera; 7. light source; 8. driving nut; 9. screw rod; 10. second motor; 11. support. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 2 The present invention provides a technical solution: a CCD processing device for a lithium battery lamination process, comprising:

[0038] Fixed plate 5;

[0039] A diaphragm unwinding roller 1 is arranged at one end of the front surface of the fixed plate 5 to unwind the diaphragm;

[0040] The film pulling assembly 3 is arranged at the middle of the front surface of the fixed plate 5 to pull the diaphragm to move, and a roller guide assembly 2 is arranged between the film pulling assembly 3 and the diaphragm unwinding roller 1;

[0041] A lamination mechanism 4 is provided at the lower end of the front surface of the fixing plate 5 to laminate the diaphragm;

[0042] At least two CCD cameras 6 are symmetrically arranged on the front surface of the fixing plate 5, and the shooting ports of the CCD cameras 6 face the stacking mechanism 4;

[0043] The light source 7 is disposed at the lower end of the front surface of the fixing plate 5 to illuminate the stacking mechanism 4 during shooting.

[0044] It is convenient to illuminate through two CCD cameras 6 and light source 7, photograph and identify the pole pieces during lamination, eliminate defects when they exist, and perform lamination when there are no defects, thereby improving product quality, and being able to stretch the diaphragm well when laminating the diaphragm to ensure the neatness of the diaphragm.

[0045] Preferably, the film pulling assembly 3 includes a first positioning clamp 3-1, a second positioning clamp 3-2, a sliding plate 3-3, a guide rail 3-4 and a linear drive mechanism. The sliding plate 3-3 is arranged on the front surface of the fixed plate 5, and the front surface of the fixed plate 5 is provided with a guide rail 3-4 that slides with the sliding plate 3-3. Two second positioning clamps 3-2 are symmetrically arranged on the front surface of the sliding plate 3-3. The middle part of the front surface of the fixed plate 5 is symmetrically provided with a first positioning clamp 3-1 that feeds the second positioning clamp 3-2. The sliding plate 3-3 is connected to a linear drive mechanism that drives it to move left and right, so that the diaphragm can be stacked in a Z shape when stacking. The surface of the diaphragm is ensured to be flat during stacking, the occurrence of wrinkles is reduced, and the diaphragm can be driven to move well.

[0046] Preferably, the linear drive mechanism includes a driving nut 8, a screw 9, a second motor 10 and a support 11. The screw 9 is rotatably mounted on the front surface of the fixed plate 5 through the supports 11 at both ends, and the driving nut 8 is sleeved on the outer surface of the screw 9. The driving nut 8 is fixed to the sliding plate 3-3. A second motor 10 is provided at one end of the screw 9, and the second motor 10 is fixedly connected to the fixed plate 5 to facilitate driving the sliding plate 3-3 to reciprocate, thereby realizing Z-shaped stacking of the diaphragm. The threaded cooperation between the screw 9 and the driving nut 8 improves the fine movement effect of the sliding plate 3-3 and ensures the accuracy of diaphragm stacking.

[0047] Preferably, the sliding plate 3-3 is rectangular, and the outer diameter of the second positioning clamp 3-2 is larger than the outer diameter of the first positioning clamp 3-1, which is convenient for adjusting and stacking the diaphragm. At the same time, the second positioning clamp 3-2 with a larger outer diameter is helpful to ensure the flatness of the diaphragm surface and reduce the situation where the small outer diameter causes wrinkles in the diaphragm.

[0048] Preferably, the stacking mechanism 4 includes a stacking platform 4-1, a knife pressing assembly 4-2 and an infrared sensor 4-3. The stacking platform 4-1 is fixed to the lower end of the front surface of the fixed plate 5. Two knife pressing assemblies 4-2 are symmetrically arranged on the stacking platform 4-1, and an infrared sensor 4-3 for detecting its movement is arranged on one side of the knife pressing assembly 4-2. It is convenient to detect the movement of the knife pressing assembly 4-2 through the infrared sensor 4-3 and feed it back to the external CCD processing system. After receiving the signal from the infrared sensor, the CCD processing system controls the CCD camera 6 to take a snapshot to avoid defects in stacking caused by the knife pressing assembly 4-2 not working during stacking, which is beneficial to ensuring product quality.

[0049] Preferably, the roller guide assembly 2 includes a front guide roller 2-1, a tension mechanism 2-2 and a rear guide roller 2-3. The tension mechanism 2-2 is arranged at the upper end of the front surface of the fixed plate 5, and a front guide roller 2-1 is provided between the tension mechanism 2-2 and the diaphragm unwinding roller 1. The rear guide roller 2-3 is arranged between the tension mechanism 2-2 and the film pulling assembly 3 to guide the diaphragm, so as to better guide the movement of the diaphragm. During the guiding process, the diaphragm is tensioned to avoid wrinkles caused by relaxation, thereby improving the flatness of the diaphragm.

[0050] Preferably, two front guide roller wheels 2-1 are provided to facilitate better guiding effect on the diaphragm.

[0051] Preferably, the tension mechanism 2-2 includes a first tensioning wheel 2-21, a mounting plate 2-22, a connecting rod 2-23, a first guide roller 2-24 and a second guide roller 2-25. The connecting rod 2-23 is rotatably mounted on the front surface of the fixed plate 5, and a servo motor for driving the connecting rod 2-23 to deflect is provided on the rear surface of the fixed plate 5 corresponding to the connecting rod 2-23. Mounting plates 2-22 are fixed at both ends of the connecting rod 2-23, and the first tensioning wheel 2-21 is rotatably mounted on the front surface of the mounting plate 2-22. The first guide roller 2-24 and the second guide roller 2-25 are staggered and arranged on both sides of the connecting rod 2-23 to facilitate tensioning of the diaphragm and avoid wrinkles caused by loosening of the diaphragm during later stacking, which affects the quality of the product.

[0052] Preferably, the CCD camera 6 is a tilting structure, and one end of the CCD camera 6 cooperates with the fixed plate 5 through a rotating damper to adjust the tilt angle of the CCD camera 6. The CCD camera 6 is a high-frequency CCD camera. The CCD camera is a digital camera with a charge-coupled device image sensor, which is convenient for adjusting the direction of the CCD camera 6 at a later stage so that it can be better aligned with the pole piece to photograph and identify the pole piece.

[0053] Preferably, the number of light sources 7 is the same as the number of CCD cameras 6, so as to ensure the lighting effect, thereby facilitating better image acquisition of the positive electrode sheet area and the negative electrode sheet area.

[0054] The working principle and use process of the present invention are as follows: when the lithium battery stacking device is working, the diaphragm unwinding roller 1 retracts and unwinds the diaphragm, and the diaphragm passes through the front guide roller 2-1, the tension mechanism 2-2 and the rear guide roller 2-3 and enters the two first positioning rollers 3-1 for positioning, and then enters the two second positioning rollers 3-2, and the two second positioning rollers 3-2 are driven by the linear drive mechanism to move left and right, thereby swinging the diaphragm above the stacking platform left and right. Specifically, when the second positioning roller 3-2 is located on the right side, as shown in FIG. Figure 1 As shown, at this time, the knife pressing assembly 4-2 on the right presses the diaphragm downward on the stacking platform 4-1, and the action of the knife pressing assembly is sensed by the infrared sensor 4-3. The CCD camera 6 on the left takes a picture of the positive electrode sheet area, and the CCD processing system determines whether the positive electrode sheet to be taken has defects. The system selects the position of the electrode sheet by the change of the gray value before and after the light source 7 is illuminated, and determines whether the electrode sheet has defects and the area of ​​the defects. When the feedback is that there are no defects, the left side of the stacking platform 4-1 may be provided with a positive electrode sheet area and a first robotic arm, and the right side of the stacking platform 4-1 may be provided with a negative electrode sheet area and a second robotic arm. The first robotic arm on the left takes out the positive electrode sheet from the positive electrode sheet area and performs the stacking operation. When defects exist, the defective positive electrode sheet is automatically excluded, and the next positive electrode sheet is repeatedly photographed and determined to have defects until the next positive electrode sheet is qualified; when the stacking of the positive electrode sheet on the left is completed When the pressure knife assembly 4-2 on the right side is kept in a pressed state, the pressure knife assembly 4-2 on the left side is loosened, and the linear drive mechanism drives the two second positioning rollers 3-2 to move to the left side. When the diaphragm is loose, it is adjusted by the tension mechanism. When it reaches a certain position on the left side, the pressure knife assembly 4-2 on the left side presses the diaphragm on the stacking table, and the infrared sensor 4-3 on the left side senses the action of the pressure knife assembly on the left side. The CCD camera 6 on the right side takes pictures of the negative electrode sheet area, and the external CCD processing system determines whether the negative electrode sheet to be taken has defects. When there is no defect, the second mechanical arm on the right side takes out the negative electrode sheet from the negative electrode sheet area and performs the stacking operation. When there is a defect, the defective negative electrode sheet is automatically excluded, and the next negative electrode sheet is repeatedly photographed and judged whether there is a defect until the next negative electrode sheet is qualified. The second mechanical arm completes the stacking work and repeats the above action to perform Z-type stacking. By repeatedly taking pictures and sampling with two CCD cameras 6, defective positive and negative electrode sheets can be prevented from being stacked into the stacking core. This detection process is added on the basis of the existing technology and solves the technical problems found in the actual production process.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A CCD processing device for lithium battery lamination process, It is characterized in that include: Fixed plate (5); A diaphragm unwinding roller (1) is arranged at one end of the front surface of the fixed plate (5) to unwind the diaphragm; A film pulling assembly (3) is arranged in the middle of the front surface of the fixed plate (5) to pull the diaphragm to move, and a roller guide assembly (2) is arranged between the film pulling assembly (3) and the diaphragm unwinding roller (1); A lamination mechanism (4) is arranged at the lower end of the front surface of the fixing plate (5) to laminate the diaphragm; At least two CCD cameras (6) are symmetrically arranged on the front surface of the fixing plate (5), and the shooting ports of the CCD cameras (6) face the lamination mechanism (4); A light source (7) is arranged at the lower end of the front surface of the fixing plate (5) to illuminate the stacking mechanism (4) during shooting.

2. A CCD processing device for a lithium battery lamination process according to claim 1, Features: The film-pulling assembly (3) comprises a first positioning clamping rod (3-1), a second positioning clamping rod (3-2), a sliding plate (3-3), a guide rail (3-4) and a linear drive mechanism. The sliding plate (3-3) is arranged on the front surface of the fixed plate (5), and the front surface of the fixed plate (5) is provided with a guide rail (3-4) that slidably cooperates with the sliding plate (3-3). Two second positioning clamping rods (3-2) are symmetrically arranged on the front surface of the sliding plate (3-3). A first positioning clamping rod (3-1) for feeding material to the second positioning clamping rod (3-2) is symmetrically arranged in the middle of the front surface of the fixed plate (5). The sliding plate (3-3) is connected to a linear drive mechanism that drives it to move left and right.

3. A CCD processing device for a lithium battery lamination process according to claim 2, Features: The linear drive mechanism comprises a driving nut (8), a screw rod (9), a second motor (10) and a support (11); the screw rod (9) is rotatably mounted on the front surface of the fixed plate (5) through the supports (11) at both ends, and the driving nut (8) is sleeved on the outer surface of the screw rod (9); the driving nut (8) is fixed to the sliding plate (3-3); a second motor (10) is arranged at one end of the screw rod (9), and the second motor (10) is fixedly connected to the fixed plate (5).

4. A CCD processing device for a lithium battery lamination process according to claim 2, Features: The sliding plate (3-3) is rectangular, and the outer diameter of the second positioning clamping rod (3-2) is greater than the outer diameter of the first positioning clamping rod (3-1).

5. A CCD processing device for a lithium battery lamination process according to claim 1, Features: The stacking mechanism (4) comprises a stacking platform (4-1), a knife pressing assembly (4-2) and an infrared sensor (4-3); the stacking platform (4-1) is fixed to the lower end of the front surface of the fixed plate (5); two knife pressing assemblies (4-2) are symmetrically arranged on the stacking platform (4-1); and an infrared sensor (4-3) for detecting the movement of the knife pressing assembly (4-2) is arranged on one side of the knife pressing assembly (4-2).

6. A CCD processing device for a lithium battery lamination process according to claim 1, Features: The roller guide assembly (2) comprises a front guide roller (2-1), a tension mechanism (2-2) and a rear guide roller (2-3); the tension mechanism (2-2) is arranged at the upper end of the front surface of the fixed plate (5), and a front guide roller (2-1) is provided between the tension mechanism (2-2) and the diaphragm unwinding roller (1); the rear guide roller (2-3) is arranged between the tension mechanism (2-2) and the film pulling assembly (3) to guide the diaphragm.

7. A CCD processing device for a lithium battery lamination process according to claim 6, Features: Two front guide roller wheels (2-1) are provided.

8. A CCD processing device for a lithium battery lamination process according to claim 6, Features: The tension mechanism (2-2) comprises a first tensioning wheel (2-21), a mounting plate (2-22), a connecting rod (2-23), a first guide roller (2-24) and a second guide roller (2-25); the connecting rod (2-23) is rotatably mounted on the front surface of the fixed plate (5); a servo motor for driving the connecting rod (2-23) to deflect is arranged on the rear surface of the fixed plate (5) corresponding to the connecting rod (2-23); mounting plates (2-22) are fixed at both ends of the connecting rod (2-23); the first tensioning wheel (2-21) is rotatably mounted on the front surface of the mounting plate (2-22); the first guide roller (2-24) and the second guide roller (2-25) are staggered and arranged on both sides of the connecting rod (2-23).

9. A CCD processing device for a lithium battery lamination process according to claim 1, Features: The CCD camera (6) is of a tilting structure, and one end of the CCD camera (6) cooperates with the fixing plate (5) via a rotating damper to adjust the tilting angle of the CCD camera (6).

10. A CCD processing device for a lithium battery lamination process according to claim 1, Features: The number of the light sources (7) is the same as the number of the CCD cameras (6).

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