A battery piece film coating system and a battery piece film coating quality control system

Abstract

A solar cell coating system, belonging to the field of solar cell manufacturing technology, includes a coating frame with several film rollers for mounting film rolls. Each film roller has a film thickness sensor on one side for detecting the amount of film used. The coating frame also includes a pressing roller assembly for pressing the film onto the surface of the solar cell, a cutting assembly for cutting the film roll when the film thickness sensor detects that the roll thickness has reached a preset value during operation, and a roll-changing adsorption assembly for adsorbing the cut film onto a new roll. Furthermore, this invention discloses a solar cell coating quality control system, including a feeding system. The feeding end of the feeding system is equipped with a visual sensor for detecting solar cell position deviation, and the discharging end of the feeding system is equipped with a coating system. This ensures both production capacity and coating quality.

Description

Technical Field

[0001] This invention belongs to the field of solar cell manufacturing technology, and specifically relates to a cell coating system and a cell coating quality control system. Background Technology

[0002] Interdigitated back contact (IBC) cells emerged in the 1970s and were among the earliest back-junction cells studied. Initially used primarily in concentrated photovoltaic systems, these cells utilize n-type substrates, with both front and back surfaces covered by a thermal oxide film to reduce surface recombination. Using photolithography, phosphorus and boron are locally diffused onto the back of the cell, forming finger-like, interlaced P-regions and N-regions, as well as P+ and n+ regions above them. The re-diffused P+ and N+ regions effectively eliminate voltage saturation under high-concentration conditions. Furthermore, the coverage area of ​​the P+ and N+ contact electrodes almost reaches half of the back surface, significantly reducing series resistance. Therefore, IBC cells are highly popular in the photovoltaic field.

[0003] However, during the production or transportation of IBC batteries, surface damage to the cells is a frequent problem. This damage is caused by the structural characteristics of the IBC cells themselves (one side has grid lines, and the other side is smooth). To solve this problem, researchers first changed the size of the storage box for stacking IBC cells to prevent the IBC cells from shaking inside the storage box. However, this setting is not ideal. As a result, they placed separator paper between two adjacent IBC cells. However, this method reduces production capacity. At the same time, the placement of the separator paper needs to be precise, otherwise the problem of cell damage will still exist. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cell coating system and a battery cell coating quality control system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A solar cell coating system includes a coating frame, on which are arranged a plurality of film rollers for mounting film rolls and film thickness sensors for detecting the amount of film used on the plurality of film rollers; wherein, the coating frame is further provided with a pressing roller assembly for pressing the film onto the surface of the solar cell, a cutting blade assembly for cutting the film roll when the film thickness sensor detects that the film roll thickness has reached a preset value during operation, and a roll-changing adsorption assembly for adsorbing the cut film together with a new film roll.

[0007] Preferably, one side of each of the membrane rollers is provided with a membrane thickness sensor for detecting the amount of membrane used.

[0008] Preferably, the roll-changing adsorption assembly includes a base vertically disposed on the laminating machine frame, a first adsorption plate and a second adsorption plate disposed on the base, the first adsorption plate and the second adsorption plate being disposed opposite each other vertically, and both the first adsorption plate and the second adsorption plate being slidably disposed relative to the base.

[0009] Preferably, an anti-sticking layer is provided on the opposite end faces of the first adsorption plate and the second adsorption plate.

[0010] Preferably, the second adsorption plate is provided with a vacuum adsorption area.

[0011] Preferably, the assembly also includes a guide roller assembly for conveying the film, the guide roller assembly including a mounting frame, on one side of which a guide roller is disposed, and on the side of the mounting frame opposite to the guide roller, a correction component for driving the guide roller assembly to correct its deviation.

[0012] Preferably, the correction assembly includes a correction block disposed on the side of the mounting frame away from the guide roller, and a connecting block is fixedly disposed on the end face of the mounting frame away from the guide roller. A roller is rotatably connected to the connecting block, and a correction track is provided on the correction block. The roller is housed in the correction track and slides relative to the correction track.

[0013] Preferably, the correction assembly further includes a correction sensor, on which a sliding block is connected, and the sliding block is slidably connected to a correction guide rod.

[0014] Preferably, the coating system also includes several auxiliary rollers.

[0015] Preferably, the pressing roller assembly includes a pressing roller for pressing film and a lifting mechanism 71 for adjusting the lifting and lowering of the pressing roller.

[0016] Preferably, the film thickness sensor is an ultrasonic sensor.

[0017] Preferably, the cutter assembly includes a slide rail, on which a sliding blade holder is disposed that slides relative to the slide rail, and a cutter is detachably connected to the sliding blade holder.

[0018] The present invention also discloses a battery cell coating quality control system, including a feeding system, wherein the feeding end of the feeding system is provided with a visual sensor for detecting the positional deviation of the battery cells, and the discharging end of the feeding system is provided with a coating system as described in any of the above embodiments.

[0019] Preferably, a conveyor line for transporting the battery cells is also included.

[0020] Preferably, the conveyor line is provided with at least one, and the conveyor line includes a set of adsorption belt rollers, which are connected by a vacuum adsorption belt.

[0021] Preferably, the output end of the conveyor line is connected to a vision system for visually photographing the coated battery cells, and the vision system is electrically connected to a laser scribing system for scribing lines on the battery cells.

[0022] Preferably, the laser marking system includes a laser and a 3D dynamic galvanometer, with the output end of the laser equipped with the 3D dynamic galvanometer.

[0023] Preferably, the system also includes a feeding system, which includes a feeding vacuum adsorption conveyor belt, and the output end of the feeding vacuum adsorption conveyor belt is provided with a feeding module.

[0024] Preferably, the unloading module includes a robotic arm, the clamping end of which is provided with a suction cup, and the contact surface between the suction cup and the battery cell is made of POM material.

[0025] Preferably, the feeding module also includes a PL device for detecting the film application effect.

[0026] Compared with existing technologies, this technical solution has the following advantages:

[0027] (1) By using a film coating method to replace the traditional method of storing with isolation paper or material boxes, the problem of surface damage caused by the structure of existing IBC cells during storage or transportation can be solved.

[0028] (2) The thickness of the film roll on the corresponding film roller is detected by the film thickness sensor. When the thickness reaches the preset value, the cutter assembly cuts the film that is participating in the coating. At this time, the roll changing adsorption assembly presses the cut film with the end of the new film roll to be used, thereby realizing the film changing without stopping the machine during the coating process.

[0029] (3) The quality control system in this invention ensures production capacity while guaranteeing the quality of film coating by positioning the material feeding and combining non-stop film replacement and deviation correction during film coating. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall architecture of the present invention;

[0031] Figure 2 This is a schematic diagram of the conveyor line architecture in this invention;

[0032] Figure 3 A schematic diagram of the coating system in this invention;

[0033] Figure 4 This is a schematic diagram of the combined structure of the web-correcting component and the guide roller component in the film coating system of the present invention;

[0034] Figure 5 yes Figure 4 A magnified view of the partial structure at point "A" in the middle;

[0035] Figure 6 This is a schematic diagram of the cutter assembly in the coating system of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the roll-changing adsorption component in the coating system of the present invention;

[0037] Figure 8 This is a schematic diagram of the coating roller assembly in the coating system of the present invention. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] like Figure 1 The illustrated battery cell coating quality control system includes a feeding system 101. The feeding end of the feeding system 101 is equipped with a vision sensor 100 for detecting the positional deviation of the battery cells, and the discharging end of the feeding system 101 is equipped with a coating system for coating the battery cells. In this embodiment, the feeding system 101 is an intelligent robot. The robot and the vision sensor 100 are used to position the battery cells during feeding. The vision device finds the center point and rotation angle of the battery cell after grasping its edge, and compares it with the standard position to obtain the amount of movement required to move to the standard unloading position, thereby ensuring the accuracy of the battery cell feeding.

[0040] In addition, this quality control system also includes a conveyor line 102 for transporting battery cells, see reference. Figure 2The conveyor line 102 is provided at least once, and the conveyor line 102 includes a set of adsorption belt rollers. The set of adsorption belt rollers are connected by a vacuum adsorption belt. It is worth noting that in this invention, the conveyor line 102 runs through the entire system from beginning to end. That is, the conveyor line 102 is required for the feeding and unloading of the battery cells, as well as the coating and post-coating inspection processes in the intermediate processing steps. In this embodiment, the conveyor line 102 adopts a dual-line parallel setting in the feeding and coating processes to improve the overall machine capacity. Of course, the vacuum adsorption belt uses a high-flow vacuum pump to provide a continuous and stable vacuum suction force to ensure that the battery cells can be firmly adsorbed during the transmission process, thereby ensuring the stability and consistency of the coating effect. The vacuum force of the battery cells adsorbed and the feeding force of the belt conveyor pull the film roller 2 in the coating system to passively release the material. At the same time, the adsorption belt rollers are made of polyurethane coated rollers, which are not prone to static electricity adsorption of dust when in contact with the belt, thus reducing battery cell contamination.

[0041] Following the positioning of the loading material, a novel battery cell coating system was designed to improve the continuity and quality assurance of the coating process. Details are as follows: Figure 3-8 As shown, it includes a laminating frame 1, on which several functional components are provided;

[0042] In this embodiment, the functional components include: several film rollers 2 for mounting film rolls; a guide roller assembly 6 for conveying the film; and a pressing roller assembly 7 for pressing the film onto the surface of the battery cell. Two film rollers 2 are selected, and these two film rollers 2 are vertically spaced apart. To more accurately detect the thickness of the film roll mounted on the corresponding film roller 2, i.e., the distance between the surface of the film roller 2 and the outermost surface of the film roll fixed thereon, a film thickness sensor, which is an ultrasonic sensor, is provided on one side of the film roller 2. Therefore, in practical applications, this film thickness sensor first selects a point on the outer surface of the film roller 2 as a first positioning point. Then, after mounting the film roll, it extends from this positioning point to the outermost surface of the film roll to capture a second point as a second positioning point. The thickness of the film roll at the corresponding moment is calculated using the first and second positioning points, so that the cutting assembly 3 can be activated to cut the film.

[0043] Secondly, two cutting assemblies 3 and one roll-changing adsorption assembly 4 are sequentially arranged on the left side of the film roller 2 (i.e., in the film conveying direction). The two cutting assemblies 3 are consistent with the two film rollers 2 and are arranged vertically at intervals to facilitate subsequent cutting of the film on the corresponding film roller 2. The cutting assemblies 3 are used to cut the film roll when the film thickness sensor detects that the film roll thickness has reached the preset value. Then, under the action of the roll-changing adsorption assembly 4, the cut film is adsorbed onto the film roll on the other film roller 2.

[0044] In this embodiment, the cutter assembly 3 includes a slide rail 30, on which a sliding blade holder 31 is provided that slides relative to the slide rail 30, and a cutter 32 is detachably connected to the sliding blade holder 31; the detachable connection described in this specific embodiment is one of bolt connection, snap-fit ​​connection or insert.

[0045] In this embodiment, a double unwinding reel is used, and when one reel is used up, it is promptly replaced with another reel, so as not to cause machine downtime or production stoppage due to reel replacement. The reel replacement adsorption assembly 4 includes a base 40 vertically arranged on the laminating frame 1. The base 40 is provided with a first adsorption plate 41 and a second adsorption plate 42. The first adsorption plate 41 and the second adsorption plate 42 are arranged vertically opposite each other, and both the first adsorption plate 41 and the second adsorption plate 42 are slidably arranged relative to the base 40.

[0046] To better understand the membrane replacement process, we will explain it in conjunction with a practical application scenario. First, the film on the upper film roller 2 (hereinafter referred to as the first film) is used to coat multiple battery cells. The first film then contacts the first auxiliary roller 5 and the guide roller assembly 6 in sequence, so that the front end of the first film hangs above the conveyor belt used to transport the battery cells. Alternatively, the front end of the first film is adsorbed onto the surface of the pressure roller in the pressure roller assembly 7. The first adsorption plate 41 is located above the first film. At the same time, the front end of the film on the lower film roller 2 (hereinafter referred to as the second film), i.e. the traction end, is adsorbed onto the lower second adsorption plate 42.

[0047] As the number of lamination cycles increases, the first film gradually decreases. When the film thickness sensor detects that the film replacement standard has been reached, the first adsorption plate 41 moves downward and / or the second adsorption plate 42 moves upward, thereby bonding the second film and the first film together. At this time, the cutter assembly 3 near the upper film roller 2 cuts the connection between the first film and the upper film roller 2, so that subsequent lamination work can proceed normally. Meanwhile, since the film itself has a certain degree of adhesion, in order to prevent it from sticking to the first adsorption plate 41 and / or the second adsorption plate 42, an anti-sticking layer 43 is provided on the opposite end faces of the first adsorption plate 41 and the second adsorption plate 42. When changing rolls, the joint of the two rolls of film is clamped to avoid poor connection such as loose protective film and wrinkles.

[0048] It is worth mentioning that, in order to achieve this operation and improve the smoothness of film transport, this coating system also includes several auxiliary rollers, including a first auxiliary roller 5 and a second auxiliary roller 9 arranged horizontally at intervals. In actual application scenarios, the end of the film roll on the lower film roller 2 is located on the second adsorption plate 42. In order to prevent the film from falling off before it is pressed with the film in use, a vacuum adsorption area is added to the second adsorption plate 42. At the same time, in order to prevent the vacuum adsorption from interfering with the film transport after subsequent pressing, there are two ways to set it up: first, the vacuum device of the vacuum adsorption area will be turned off during pressing, so that the suction force disappears; second, the vacuum device of the vacuum adsorption area is always on, but the following requirements must be met: film transport force > adsorption force > film self-falling force.

[0049] In this embodiment, the film pressing roller assembly 7 includes a film pressing roller 70, and both ends of the film pressing roller 70 are connected to a lifting mechanism 71; wherein, the lifting mechanism 71 includes a driving member 710, the driving end of the driving member 710 is poweredly connected to a lifting member 711, and the end of the lifting member 711 away from the driving member 710 is connected to the film pressing roller 70; the driving member 710 is one or more of a hydraulic cylinder, a motor, and a pneumatic cylinder.

[0050] In this application scenario, the pressing roller 70 can be used as one of the traction components for pulling the film. The pressing roller 70 is a silicone-coated roller. At the same time, the driving component 710 in this embodiment is a pressing roller cylinder with adjustable stroke, which can control and adjust the force of the pressing roller 70 to ensure that the pressing roller 70 does not easily cause fragmentation when pressing the battery cell. Then, combined with the function of the guide roller assembly 6, the film can be smoothly pressed onto the surface of the battery. The guide roller assembly 6 includes a mounting frame 60. On one side of the mounting frame 60, a first guide roller 61 and a second guide roller 62 are arranged in sequence according to the film conveying direction. On the side of the mounting frame 60 opposite to the first guide roller 61 and the second guide roller 62, a correction component 63 for driving the guide roller assembly 6 to correct deviation is provided.

[0051] refer to Figure 4 or Figure 5It is known that the correction assembly 63 includes a power box, and a crank connecting rod is connected to one side of the upper end face of the power box. The crank connecting rod is rotatably connected to the mounting frame 60. Two correction blocks 630 are fixed on the upper end face of the power box opposite to the position of the crank connecting rod. Correction tracks 631 are respectively provided on the two correction blocks 630. The roller 632 is housed in the correction track 631 and slides relative to the correction track 631. A connecting block 633 is fixed on the end face of the mounting frame 60 away from the first guide roller 61 and the second guide roller 62. The connecting block 633 is rotatably connected to the roller 632.

[0052] The appendix in conjunction with this embodiment Figure 3-5 To elaborate on the specific working process of the correction component 63: First, the drive device in the power box drives the crank connecting rod to make a circular motion around the drive shaft. In this embodiment, the crank connecting rod is a common crank component on the market. The crank component and the mounting bracket 60 are connected to each other by a shaft / pin. Because a crank component is used, when the crank component is driven, it will drive the mounting bracket 60 to make a curved sliding motion in the plane. Combined with the correction block 630 and the roller 632, the mounting bracket 60 is made to swing horizontally in a plane parallel to the horizontal plane, thereby achieving the correction effect.

[0053] In addition, in order to accommodate films of different widths, the correction assembly 63 also includes a correction sensor 64, on which a sliding block is connected, and the sliding block is slidably connected to a correction guide rod 65.

[0054] After the coating is completed, the output end of the conveyor line is connected to a vision system for visually photographing the coated battery cells. The vision system is electrically connected to a laser scribing system for scribing lines on the battery cells. The laser scribing system includes a laser and a 3D dynamic galvanometer. The output end of the laser is equipped with a 3D dynamic galvanometer. Based on the battery cell position information fed back by the vision system, the galvanometer adjusts the light output parameters in real time to ensure the consistency and accuracy of the scribing.

[0055] In addition, this quality control system also includes a feeding system 105, which includes a feeding vacuum adsorption conveyor belt. The output end of the feeding vacuum adsorption conveyor belt is equipped with a feeding module. During visual positioning and laser marking, the vacuum is turned on and the battery cells do not move. After the laser marking is completed, the vacuum is turned off and the battery cells are transported to the feeding belt by the feeding module.

[0056] To ensure production capacity and CT (Cycle Time) cycle time, the unloading module includes a robotic arm, the clamping end of which is equipped with a suction cup, and the contact surface between the suction cup and the battery cell is made of POM material.

[0057] In addition, in order to detect the film application effect in real time and reject defective products, the feeding module also includes a PL (Photoluminescence) device for detecting the film application effect. When continuous film application defects occur, the device alarms and stops to avoid batch defective products.

[0058] In the description of this invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a number" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0059] This invention has been described with reference to embodiments. Several modifications and improvements can be made to this device without departing from its fundamental principles. It should be noted that all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of this invention.

Claims

1. A battery cell coating system, comprising a coating frame (1), characterized in that: The laminating frame (1) is provided with a number of film rollers (2) for mounting film rolls and film thickness sensors for detecting the amount of film used on the film rollers (2); wherein, the laminating frame (1) is also provided with a pressing roller assembly (7) for pressing the film onto the surface of the battery cell, a cutting blade assembly (3) for cutting the film roll when the film thickness sensor detects that the film roll thickness has reached the preset value during the working process, and a roll changing adsorption assembly (4) for adsorbing the cut film together with the new film roll.

2. The battery cell coating system as described in claim 1, characterized in that: Each of the membrane rollers (2) is provided with a membrane thickness sensor on one side for detecting the amount of membrane used.

3. The battery cell coating system as described in claim 1, characterized in that: The roll-changing adsorption assembly (4) includes a base (40) vertically arranged on the film-coating frame (1). A first adsorption plate (41) and a second adsorption plate (42) are arranged on the base (40). The first adsorption plate (41) and the second adsorption plate (42) are arranged opposite each other vertically, and both the first adsorption plate (41) and the second adsorption plate (42) are slidably arranged relative to the base (40).

4. The battery cell coating system as described in claim 3, characterized in that: An anti-sticking layer (43) is provided on the opposite end faces of the first adsorption plate (41) and the second adsorption plate (42).

5. A battery cell coating system as described in claim 4, characterized in that: The second adsorption plate (42) is provided with a vacuum adsorption area.

6. The battery cell coating system as described in claim 1, characterized in that: It also includes a guide roller assembly (6) for conveying film, the guide roller assembly (6) including a mounting frame (60), one side of which is provided with a guide roller, and the side of the mounting frame (60) opposite to the guide roller is provided with a correction component (63) for driving the guide roller assembly (6) to correct its deviation.

7. A battery cell coating system as described in claim 6, characterized in that: The correction assembly (63) includes a correction block (630) disposed on the side of the mounting frame (60) away from the guide roller, and a connecting block (633) is fixedly disposed on the end face of the mounting frame (60) away from the guide roller. A roller (632) is rotatably connected to the connecting block (633). A correction track (631) is provided on the correction block (630). The roller (632) is housed in the correction track (631) and slides relative to the correction track (631).

8. A cell coating system as described in claim 7, characterized in that: The correction assembly (63) also includes a correction sensor (64), on which a sliding block is connected, and the sliding block is slidably connected to a correction guide rod (65).

9. A battery cell coating system as described in claim 6, characterized in that: The coating system also includes several auxiliary rollers.

10. A battery cell coating system as described in claim 1, characterized in that: The pressure roller assembly (7) includes a pressure roller (70) for pressing the film and a lifting mechanism (71) for adjusting the lifting of the pressure roller.

11. A cell coating system as described in claim 1 or 2, characterized in that: The film thickness sensor is an ultrasonic sensor.

12. The battery cell coating system as described in claim 1, characterized in that: The cutter assembly (3) includes a slide rail (30), on which a sliding blade holder (31) is provided that slides relative to the slide rail (30), and a cutter (32) is detachably connected to the sliding blade holder (31).

13. A quality control system for solar cell coating, comprising a feeding system (101), characterized in that: The feeding end of the feeding system is provided with a vision sensor (100) for detecting the positional deviation of the battery cells, and the discharging end of the feeding system is provided with a coating system as described in any one of claims 1-11.

14. The battery cell coating quality control system as described in claim 13, characterized in that: It also includes a conveyor line (102) for transporting the battery cells.

15. A battery cell coating quality control system as described in claim 14, characterized in that: The conveyor line (102) is provided at least one, and the conveyor line (102) includes a set of adsorption belt rollers, which are connected by a vacuum adsorption belt.

16. A battery cell coating quality control system as described in claim 14 or 15, characterized in that: The output end of the conveyor line (102) is connected to a vision system (103) for visually photographing the coated battery cells, and the vision system (103) is electrically connected to a laser scribing system (104) for scribing the battery cells.

17. A battery cell coating quality control system as described in claim 16, characterized in that: The laser marking system (104) includes a laser and a 3D dynamic galvanometer, and the output end of the laser is provided with a 3D dynamic galvanometer.

18. A battery cell coating quality control system as described in claim 13, characterized in that: It also includes a feeding system (105), which includes a feeding vacuum adsorption conveyor belt, and the output end of the feeding vacuum adsorption conveyor belt is provided with a feeding module.

19. A battery cell coating quality control system as described in claim 18, characterized in that: The unloading module includes a robotic arm, and the clamping end of the robotic arm is equipped with a suction cup. The contact surface between the suction cup and the battery cell is made of POM material.

20. A battery cell coating quality control system as described in claim 18, characterized in that: The feeding module also includes a PL device for detecting the film application effect.

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