Front and back surface printing and glue stringing production line and process of solar cell

Abstract

The invention relates to a front and back face printing and glue stringing production line and process for solar cell pieces. The production line comprises a front face glue applying device, a string dividing device, a turn-over device, a back face glue applying device, an EL detection device and a screening device. On one hand, on the premise of shortening the length of the assembly line, the layout space limitation required by the production line is eliminated, the practicability is enhanced, and meanwhile, the structure of the production line is optimized and the cost is reduced based on 90-degree turnover vertical detection and transverse transfer of the detection manipulator; on the other hand, in the glue stringing process, the two scrapers are switched between the upper position and the lower position, the deformation quantity caused by the two scrapers to the glue applying mesh plate is relatively eliminated, glue is kept between the two scrapers to pass through a mesh area in a reciprocating mode, glue scraping is carried out twice, the glue scraping quality and efficiency are improved, meanwhile, the scrapers form whole-process attaching glue scraping, and the glue scraping efficiency is improved. The size of formed glue points is uniform, the probability of deformation of the gluing mesh plate is small, in addition, glue injection operation can be conducted anytime and anywhere, and glue mixing is kept in a mode that the glue amount is sufficient.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a front and back printing glue stringing production line for solar cell sheets, and also relates to a front and back printing glue stringing process for solar cell sheets. Background Art

[0002] Traditional solar cells have metal electrodes on the front and back sides used to derive internal current, which can be divided into main grid and fine grid. The main grid mainly collects the current of the sub-grid and connects in series, while the fine grid is used to collect photogenerated carriers. As the grid line patterns develop successively, and they are 4BB, 5BB, MBB, and SMBB respectively, the main grid becomes thinner (reducing shading loss and silver consumption) and more (ensuring conductive performance). 0BB (no main grid) is a further upgrade of SMBB technology, using thinner welding ribbons and connecting fine grids to collect and derive current. This design significantly reduces the metal shading area of ​​the battery backplane, increases the light receiving area, and thus improves the power generation efficiency of the photovoltaic panel. At the same time, the main grid and pad points are both composed of silver. In order to reduce costs and increase efficiency to the greatest extent, many factories have also cancelled the pad points after upgrading the no main grid technology. However, this will make it difficult for the welding ribbon to be firmly fixed on the solar cell. Therefore, it is necessary to use corresponding fixed-point and positioning to implement glue application, and then solidify to connect the welding ribbon to the corresponding position.

[0003] At present, for the processing of printed glue on the front and back sides of 0BB type solar cells, the production line operation mode is basically adopted, first applying glue and curing on the front side; then dividing into strings and turning over; finally applying glue and curing on the back side; and inspecting and screening the front and back sides of the battery strings (qualified or unqualified).

[0004] However, there are the following defects in actual operation: 1) The entire production line formed by the above-mentioned stringing is basically laid out from beginning to end (basically using a circular conveyor belt for transmission). In addition, the length limit of the battery string itself makes it difficult to perform reversing or turning operations. Therefore, the assembly line is very long. It cannot meet the needs of many manufacturers who cannot make normal layout due to limited workshop area, which greatly reduces the practicality of the production line; 2) In the glue application process (including glue injection, glue scraping, and curing), regardless of front or back glue application, the battery cell is sent to the glue application station by fixed-point glue application, and then the glue application mesh plate (usually a steel plate) above the glue application station is used to scrape the glue and squeeze the glue liquid onto the battery cell below. Then the battery cell enters the curing area for curing glue points (it should be noted that the glue itself has viscosity, so the fluidity is relatively poor). However, the thickness of the steel plate used is relatively thin, generally about 0.1~0.3mm, and in general, there are at least two battery cells under the steel plate, so the area formed is at least 350*350mm 2 In this way, the contact position changes during the scraping process, and the steel plate is more likely to deform as it moves toward the middle. In addition, the scraping force used cannot be adjusted adaptively, resulting in uneven glue application in the middle and at both ends. Therefore, the final bonding strength is uneven. At the same time, the glue spots formed are of different sizes. If the glue spots are too large, they will cause hidden cracks when passing through the laminator. If the glue spots are too small, they cannot meet the required tension of the welding strip. In addition, since the scraper has a certain inclination angle, most of the scraping is unidirectional, that is, after completing one scraping, it is reset before the next scraping. Moreover, the deformation caused by unidirectional scraping is also unidirectional, resulting in the inability of the steel plate to effectively compensate for each other due to deformation variables, thus greatly shortening the service life of the steel plate. At the same time, there is also a glue injection problem in unidirectional scraping, because each time the glue needs to be injected on the moving side of the scraper, so the scraping efficiency is low. 3) After the glue string is completed, EL detection is required (the working principle of EL detection is as follows: 1. Excitation process: In a dark environment, a certain voltage is applied to the solar cell, and the application and size of the current are controlled by the excitation circuit. This process excites the electrons inside the solar cell with enough energy to emit electroluminescence. 2. Image capture: Use optical equipment such as infrared cameras to capture and record the light radiation emitted by the solar cell to form an image of the solar cell module. These images can clearly show the details inside the solar cell, including potential defects. 3. Defect identification: By analyzing the captured images, defects in the solar cell can be identified, such as hidden cracks, fragments, broken grids, black chips, black spots, etc. These defects will appear in different forms in the image, such as changes in brightness, shape, size, etc.), and the battery string after curing from the back is transmitted horizontally. Therefore, at least the battery string needs to be erected before EL detection. At the same time, after EL detection, qualified and unqualified products are screened based on the output of the detection conveyor belt, which not only increases the length of the production line, but also needs to match the corresponding robot structure, further complicating the production line structure and increasing costs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved front and back printing glue production line for solar cells. It is mainly used to produce 0BB battery structures.

[0006] At the same time, the present invention also relates to a front and back printing glue stringing process for solar cell sheets.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A front and back printing glue string production line for solar cell sheets, comprising a front glue applying device, a string dividing device, a flipping device, a back glue applying device, an EL detection device, and a screening device. The front glue applying device comprises a first conveyor belt, a front glue applying unit, and a front curing unit. The back glue applying device comprises a second conveyor belt, a back glue applying unit, and a back curing unit. The front glue applying unit and the back glue applying unit have the same structure, both comprising a glue applying groove with a glue applying mesh plate forming the groove bottom, and a glue scraping mechanism. In particular, The flipping device includes a transfer conveyor belt aligned with the output end of the first conveyor belt and arranged side by side with the second conveyor belt, and a transfer unit that flips the battery sheets arranged side by side on the transfer conveyor belt by 180 degrees and transfers them to the second conveyor belt; The scraping mechanism comprises a double scraper assembly capable of switching states up and down relative to each other, a power assembly for driving the double scraper assembly to reciprocate along the length direction of the glue-applying mesh plate, the double scraper assembly comprises a scraper seat, and a left and right scraper group mounted on the scraper seat, wherein two scrapers of the left and right scraper groups and the glue-applying mesh plate constitute a glue injection area, the length of each scraper itself is greater than the width of the mesh area formed by the mesh holes on the glue-applying mesh plate, and the two scrapers gradually open outward from top to bottom and intersect with the glue-applying mesh plate. During the reciprocating motion of the double scraper assembly, the two scrapers switch between upper and lower positions, and the deformation of the glue-applying mesh plate caused by the two scrapers is relatively eliminated and the glue is kept between the two scrapers, and then the glue is reciprocated through the mesh area to implement two times of scraping; The EL detection device comprises a detection connection belt aligned with the second conveyor belt, a detection manipulator located above the detection connection belt, a detection camera for acquiring images, and an image analysis unit, wherein the detection manipulator can switch the battery string between an upright state and a horizontal state with a rotation period of 90° around the length direction of the detection connection belt; The screening device includes an NG storage belt and a discharge conveyor belt which are arranged side by side with the detection connection belt and located on opposite sides of the detection connection belt. The detection robot can also move in the width direction of the detection connection belt to transfer the detected battery strings to the NG storage belt or the discharge conveyor belt for screening.

[0008] According to another specific implementation and preferred aspect of the present invention, the left and right scraper groups both include a lifting part that can be adjusted up and down, and a scraper installed at the output end of the lifting part, wherein the lifting part can provide power to drive the scraper to be pressed against the glue mesh plate to keep the scraper in the single-pass scraping process in full contact with the glue mesh plate. The active pressing here is adjusted in real time based on the deformation of the glue mesh plate. Note that this is a real-time change, not a positive pressure, because if the positive pressure exists all the time, it will inevitably increase the deformation rate of the glue mesh plate.

[0009] Preferably, the lifting part includes a main regulator and an auxiliary regulator mounted on the scraper seat, wherein the main regulator is used to drive the scraper to move up and down relative to the glue mesh plate to fit and disengage; the auxiliary regulator is installed between the main regulator and the scraper and is used to adjust the drive of the scraper to adapt to the deformation of the glue mesh plate. In some specific embodiments, the main regulator and the auxiliary regulator are both telescopic rods, wherein the main regulator and the auxiliary regulator share a power source, and the power source adaptively adjusts the output power of the auxiliary regulator based on the pressure change formed by the scraper.

[0010] Preferably, the auxiliary regulator is a telescopic rod controlled by a proportional valve to adjust the power output; the main regulator is used to drive the auxiliary regulator to move up and down. Specifically, the telescopic rod is a pneumatic cylinder or a hydraulic cylinder, and can be adaptively adjusted according to the proportional valve to provide power to match the scraper movement to keep the glue mesh plate in contact (in other words, no matter in any position, it keeps dynamic balance in the up and down directions, so as to minimize the deformation rate of the glue mesh plate); and the main regulator can use commonly used lifting components (such as: power screw, telescopic cylinder, other linear motion methods).

[0011] Alternatively, both the main regulator and the auxiliary regulator are telescopic rods, wherein the main regulator and the auxiliary regulator share a power source, and the power source adaptively adjusts the output power of the auxiliary regulator based on the pressure change formed by the scraper. Here, the power source is capable of actively changing the pressure to meet the adaptive adjustment of the output power of the auxiliary regulator (in short, the forces in the up and down directions are kept in a dynamic balance state to complete the laminating and scraping of the glue). The effect formed in this way is better than the elastic pressure formed by the "spring", because the elastic pressure will increase the deformation rate of the glue mesh plate, while the adaptive adjustment is triggered by the deformation of the glue mesh plate itself, resulting in a small deformation rate of the glue mesh plate. In some specific embodiments, the telescopic rod is pneumatically or hydraulically driven, the main regulator and the auxiliary regulator are relatively connected through a proportional valve, and the output power of the auxiliary regulator is adjusted in real time based on the adjustment of the proportional valve.

[0012] According to another specific implementation and preferred aspect of the present invention, when scraping glue on the front side, one of the two scrapers is defined as a scraper knife and the other is defined as an intercepting knife. When the scraper knife completes a single-pass scraping, the intercepting knife descends and switches to the scraper knife. The first conveyor belt delivers the glued battery cells to the front curing unit, and the battery cells that have not been glued are supplemented to the gluing station to achieve continuous gluing operation.

[0013] Preferably, the two scrapers are tilted to the left and right respectively, wherein the tilt angle is an acute angle, and the two tilt angles are kept equal. The specific tilt angle is 45~75°, and when the scraper is moved to the left to scrape the glue, the scraper on the right is selected; when the scraper is moved to the right to scrape the glue, the scraper on the left is selected; the bottom of each scraper forms a scraper surface, wherein the scraper surface is arranged to intersect with the glue mesh plate, and a line-surface contact is formed between the bottom edge of the scraper surface and the glue mesh plate for scraping the glue, and the angle formed by the scraper surface and the glue mesh plate is less than the tilt angle. In general, the angle formed by the scraper surface and the glue mesh plate is within 30°. This design facilitates sufficient glue to fill the area, thereby ensuring that the glue is scraped under the condition of sufficient glue and improving the uniformity of glue application; at the same time, through the line-surface contact, not only the friction between the scraper and the glue mesh plate is reduced, but also the best glue injection area is formed between the other parts of the scraper surface and the glue mesh plate. Therefore, once there is no glue, whether it is manual or automatic, you only need to inject the glue into the corresponding glue injection area. At the same time, due to the poor fluidity of the glue and the long scraper, the probability of glue escaping from the scraper is small. Taking a step back, even if a small amount of glue leaks out from the end of the scraper, it will not cause interference with the scraping of the glue because it is far away from the mesh area.

[0014] According to another specific implementation and preferred aspect of the present invention, each scraper includes a blade seat and a blade body, wherein the blade body is mounted on the blade seat so as to be rotatably adjusted around its own length direction, and the blade body includes a connecting portion rotatably connected to the blade seat, and a blade body which is detachable from the connecting portion and forms a scraper surface at the bottom, and the connecting portion limits the inclination angle of the blade body relative to the glue applying mesh plate by an external part detachable from the blade seat.

[0015] According to another specific implementation and preferred aspect of the present invention, the string dividing device is located between the first conveyor belt and the transfer conveyor belt, and divides the battery string according to the set number of battery cells; and / or, the transfer unit includes a first carrier that can move in the left-right direction; a first material picker installed on the first carrier and can rotate around the left-right direction with a period of 180° and move up and down; a second carrier that can move in the up-down and front-to-back directions; and a second material picker installed on the second carrier; and / or, the length of the transfer conveyor belt is less than the length of the second conveyor belt; and / or, the second conveyor belt is located above the side of the transfer conveyor belt and the distance is equal to the change in height formed by the flipping of the battery cells. The front and back sides are switched based on the 180° flip, and the side-by-side battery cells are transferred to the corresponding conveyor belt in combination with the three-axis movement in the up-down, left-right, and front-to-back directions, so as to complete the gluing and curing operations on the front and back sides of the battery cells in a flow-line manner.

[0016] Preferably, the first picker and the second picker have similar structures, and both include a picker arm extending in the left-right direction, and a plurality of negative pressure adsorption heads installed side by side on the picker arm, wherein the plurality of negative pressure adsorption heads constitute an adsorption row, and the negative pressure adsorption heads of the adsorption row perform synchronous negative pressure adsorption and pressure release to implement the pick-up and placement of side-by-side battery cells. The whole row is picked up and placed by negative pressure adsorption, and one battery cell corresponds to one negative pressure adsorption head, and of course one battery cell can also correspond to multiple negative pressure adsorption heads (such as: 2, 3 or more).

[0017] Furthermore, the first picker has two adsorption rows, and the two adsorption rows are installed in opposite directions on the upper and lower parts of the picker arm. In this way, the first picker only needs to turn 180 degrees to continuously pick and place a whole row of battery cells; and the second picker can pick up the cells from above the first picker each time, and can unload the battery cells to the second conveyor belt below without turning over.

[0018] According to another specific implementation and preferred aspect of the present invention, the front curing unit and the back curing unit have the same structure, both include a curing device located above the conveyor belt, and a visual inspection camera is also provided at the conveyor belt outlet of each curing unit; and / or, the power assembly includes a power screw, a power nut seat, and a power motor, wherein the power screw extends in the left-right direction; and / or, the front gluing device also includes a height adjustment mechanism for driving the front gluing unit to adjust the position of the gluing mesh plate in the up-down direction; the back gluing device forms a corresponding height adjustment mechanism identical thereto. In short, based on the visual inspection camera, it is possible to detect whether there is glue leakage on the surface of the battery cell; based on the transmission screw, high-precision transmission in the left-right and up-down directions is achieved, and at the same time, in order to further improve the stability of the movement, a slide rail is used for assistance; as for the curing device, UV curing, LED curing, or other curing can be used.

[0019] In some specific embodiments, the detection connection belt is located above the NG storage belt and the discharge conveyor belt, wherein the discharge conveyor belt can be adjusted along its width direction; an NG storage belt that can extend inward and outward of the detection connection belt is also provided between the NG storage belt and the detection connection belt. Here, based on the dual material connection mode of the storage belt and the storage belt in a limited space, it is convenient to collect NG battery strings; at the same time, based on the lateral adjustment of the discharge conveyor belt, the adjustment of the output position is met, and the convenience of discharge is improved.

[0020] In addition, the two front and back printing glue string production lines are side by side in the same rack; the two front and back printing glue string production lines are symmetrically arranged and share the NG storage belt and / or NG storage belt; the two front and back printing glue string production lines are relatively separated by the temporary storage belt, and the detection robot can transfer the NG battery string from the temporary storage belt to the NG storage belt or NG storage belt. Based on the dual-line layout, they can fill each other's space, and NG collection is carried out on the same side for easy processing. At the same time, in order to distinguish the two production lines, the NG storage belt and NG storage belt can store their own NG products, so that the products can quickly find the NG location point, which is convenient for manual replacement or other operations.

[0021] Another technical solution of the present invention is: a front and back printing glue stringing process of a solar cell, which adopts the front and back printing glue stringing production line of the solar cell, and comprises the following steps: S1, front glue First, the battery string is sent to the glue application station by the first conveyor belt from the front side, and is placed below the glue application mesh plate, and then glue is injected into the glue injection area so that the glue forms a cover in the wide direction of the mesh area; Secondly, when scraping glue to the left, select the right scraper; when scraping glue to the right, select the left scraper, and then switch the two scrapers up and down to form one blocking and one scraping. One of the two scrapers is defined as a scraping knife and the other is defined as an intercepting knife, wherein the intercepting knife is located on the glue-applying mesh plate, and the scraping knife fits the glue-applying mesh plate until the scraping knife scrapes the entire mesh area, and then the intercepting knife moves downward to intercept the glue from moving forward, and the intercepting knife and the scraping knife switch their states; furthermore, the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups, and the scraper can be adjusted in real time as the glue-applying mesh plate is deformed. The one-way lamination and scraping are completed in the pressure formed; at the same time, the first conveyor belt delivers the next batch of batteries to the corresponding glue application station, and then the scraper is switched up and down, and the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups, and the scraper can adjust the pressure formed in real time with the deformation of the glue application mesh plate to complete the return lamination and scraping. That is, the deformation amount of the glue application mesh plate caused by the scraper is relatively eliminated in combination with the reciprocating motion, and two scrapings can be completed in one round trip. After each glue application, the battery cell enters the front curing unit for UV curing, and the glue application position is detected based on the visual camera. S2, split into strings, turn over The end of the battery string transmitted from the first conveyor belt is divided into strings, that is, divided according to the number of battery cells of the set battery string, and after all the battery strings are located on the transfer conveyor belt, the flipping device is used to flip the front and back 180 degrees and transfer them to the second conveyor belt, wherein the battery cells transmitted from the first conveyor belt enter the transfer conveyor belt, and then the whole row of battery strings is adsorbed by the synchronous negative pressure of the adsorption row at the bottom of the first material picking hand on the first carrier, and then turned upward 180 degrees around the left and right directions so that the back of the battery cells faces upward, and moved to the left for the alignment of the second material picking hand, and then the battery string is negatively adsorbed by the second material picking hand by moving forward and backward and transferred to the second conveyor belt; S3, glue on the back The same steps as the front gluing are used to sequentially perform the gluing, scraping and curing, and finally the gluing is transmitted from the second conveyor belt; S4.EL detection When the outgoing battery string moves to the transmission detection belt, the detection manipulator above performs negative pressure adsorption and rotates 90° around the length direction of the detection connection belt to stand the battery string upright, so that the battery string faces the detection camera from the front, and the detection camera acquires and analyzes the image; S5. Screening After the analysis, the battery strings are reset first, and then qualified and unqualified are screened based on the analysis results. The qualified battery strings are transferred horizontally to the discharge conveyor belt, and the unqualified battery strings are transferred horizontally to the NG storage belt.

[0022] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art: Based on the existing battery cell stringing construction, the entire production line is basically laid out from beginning to end (basically using a circular conveyor belt for transmission), and coupled with the length limitation of the battery string itself, it is difficult to perform reversing or turning operations. Therefore, the assembly line is very long and cannot meet the needs of many manufacturers who cannot have a normal layout due to limited workshop area, greatly reducing the practicality of the production line; in the glue application process of the string (including glue injection, glue scraping, and curing), regardless of front or back glue application, the battery cell is sent to the glue application station by a fixed-point glue application method, and then the glue application mesh plate (commonly used is a steel plate) above the glue application station is used for scraping glue, and the glue is squeezed onto the battery cell in the lower position, and then the battery cell enters the curing area for curing. However, the thickness of the steel plate used is relatively thin, generally about 0.1~0.3mm, and in general, there are at least two battery cells under the steel plate, so the area formed is at least 350*350mm 2In this way, the contact position changes during the scraping process, and the steel plate is more likely to deform as it moves toward the middle. In addition, the scraping force used cannot be adjusted adaptively, resulting in uneven glue application in the middle and at both ends. Therefore, the final bonding strength is uneven. At the same time, the glue spots formed are of different sizes. If the glue spots are too large, they will cause hidden cracks when passing through the laminator. If the glue spots are too small, they cannot meet the required tension of the welding strip. In addition, since the scraper has a certain inclination angle, most of the scraping is unidirectional, that is, after completing one scraping, it is reset before the next scraping. Moreover, the deformation caused by unidirectional scraping is also unidirectional, resulting in the inability of the steel plate to effectively compensate for each other due to deformation variables, thus greatly shortening the service life of the steel plate. At the same time, there is also a glue injection problem in unidirectional scraping, because each time the glue needs to be injected on the moving side of the scraper, so the scraping efficiency is low. After the glue string is completed, EL detection is required (the working principle of EL detection is as follows: 1. Excitation process: In a dark environment, a certain voltage is applied to the solar cell, and the application and size of the current are controlled by the excitation circuit. This process makes the solar cell The electrons inside are excited by enough energy to emit electroluminescence. 2. Image capture: Use optical equipment such as infrared cameras to capture and record the light radiation emitted by solar cells to form images of solar cell modules. These images can clearly show the details inside the solar cell, including potential defects. 3. Defect identification: By analyzing the captured images, defects in solar cells, such as hidden cracks, fragments, broken grids, black chips, black spots, etc., can be identified. These defects will appear in different forms in the image, such as changes in brightness, shape, size, etc. ), and the battery string after curing from the back is transmitted horizontally, therefore, at least the battery string needs to be erected, and then EL detection is performed. At the same time, after EL detection, qualified and unqualified products are screened based on the output of the detection conveyor belt, which not only increases the length of the production line, but also needs to match the corresponding manipulator structure, further complicates the production line structure, increases costs, and other shortcomings. The present invention cleverly solves the various shortcomings of the existing structure by overall designing the front and back printing glue production line of solar cells.After adopting this production line, glue is firstly strung on the front side, then separated and turned over, then glue is strung on the back side, and then EL detection is performed, and finally qualified and unqualified screening is performed based on the EL detection results. Therefore, on the one hand, the present invention is based on the alignment and side-by-side layout of each conveyor belt, and directly moves horizontally for screening after EL detection, so as to shorten the length of the assembly line, realize the assembly line operation of glue strung on the front and back sides of the battery string in sequence, eliminate the layout space limitation required for the production line, and enhance practicality. At the same time, based on the 90° flip vertical detection, accurate screening can be performed, and the detection robot can also be used for screening and transfer, optimize the production line structure, and reduce Cost; on the other hand, during the glue stringing process, based on the reciprocating motion of the double scraper assembly, the two scrapers switch between the upper and lower positions, and the deformation caused to the glue-applying mesh plate by the two scrapers is relatively eliminated and the glue is kept between the two scrapers and then reciprocates through the mesh area to implement two scrapings, which greatly improves the quality and efficiency of the scraping. At the same time, the scraper forms a full-length glue-fitting scraping, which not only improves the uniformity of the glue point size, but also reduces the probability of deformation of the glue-applying mesh plate and extends the life of the glue-applying mesh plate. In addition, the movable glue injection area can not only inject glue anytime and anywhere, but also squeeze the glue into the corresponding mesh holes while maintaining sufficient glue mode, thereby improving the uniformity of glue application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the front and back printing glue production line of the solar cell of this embodiment; Figure 2 for Figure 1 A magnified schematic diagram of the structure; Figure 3 for Figure 2 Structural schematic diagram of the front side gluing device, string dividing device, flipping device and back side gluing device; Figure 4 for Figure 3 A schematic diagram of the main view; Figure 5 for Figure 3 A schematic diagram of the structure of the middle front glue application device; Figure 6 for Figure 5 The structural diagram of the middle glue application unit; Figure 7 for Figure 5 Structural diagram of the middle scraper mechanism; Figure 8 for Figure 7 A schematic diagram of the main view; Fig. 9 for Figure 7 Schematic diagram of the left side; Fig.10 for Figure 7 Schematic diagram of partial structural decomposition; Fig.11 for Figure 3 Schematic diagram of the structure of the center stringing device, the turning device, and the back glue application device; Fig.12 for Figure 2 Schematic diagram of the structure of the EL detection device and the screening device; Fig.13 for Fig.12 A schematic diagram of the structure from another perspective; Fig.14 for Fig.13 A schematic diagram of the main view; Wherein: ①, front glue application device; A, first conveyor belt; B, front glue application unit; 1, glue application slot; 10, glue application mesh plate; 10a, mesh; 2, glue scraping mechanism; 20, double scraper assembly; a, scraper seat; b, left and right scraper groups; b1, lifting part; b10, main regulator; b11, auxiliary regulator; b2, scraper; b20, knife seat; b21, knife body; b210, connecting part; b211, knife body; m, scraper surface; b22, external parts; 21, power assembly; c, c1, power screw rod; d, d1, power nut seat; e, e1, power motor; h, h1, slide rail; 3, height adjustment mechanism; C, front curing unit; ②, string dividing device; ③, turning device; G, transfer conveyor belt; Y, transfer unit; Y1, first carrier; Y2, first material picker; Y3, second carrier; Y4, second material picker; y1, material picker arm; y2, negative pressure adsorption head; ④, back side gluing device; D, second conveyor belt; E, back side gluing unit; F, back side curing unit; ⑤, EL detection device; Q, detection connection belt; S, detection manipulator; s1, material picking hand; T, detection camera; ⑥, screening device; J, NG storage belt; K, discharging conveyor belt; L, NG storage belt; Z, temporary storage belt; P, battery cell; W, rack; X, visual camera. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] like Figures 1 to 14As shown, the front and back printing glue string production line of the solar cell sheet of this embodiment includes a front glue applying device ①, a string dividing device ②, a flipping device ③, a back glue applying device ④, an EL detection device ⑤, and a screening device ⑥.

[0031] Specifically, the front gluing device ① and the back gluing device ④ have the same structure, the stringing device ② connects the front gluing device ① and the turning device ③, and directly enters the back gluing device ④ after turning over, and the EL detection device ⑤ is carried out after the gluing is completed, and it is directly screened to one side according to the analysis result.

[0032] In some specific embodiments, the front gluing device ① includes a first conveyor belt A, a front gluing unit B, a front curing unit C, and a front detection unit; the back gluing device ④ includes a second conveyor belt D, a back gluing unit E, a back curing unit F, and a back detection unit, wherein the front gluing unit B and the back gluing unit E have the same structure, both including a gluing groove 1 with a gluing mesh plate 10 forming a groove bottom, a gluing mechanism 2, and a height adjustment mechanism 3 that drives the gluing groove 1 and the gluing mechanism 2 to adjust the position of the gluing mesh plate 10 in the up and down directions; the front curing unit C and the back curing unit F have the same structure; the string dividing device ② uses a string divider to directly divide the strings; the flipping device ③ includes a transfer conveyor belt G that is aligned with the output end of the first conveyor belt A and is arranged side by side with the second conveyor belt D, and a transfer unit Y that flips the battery cells arranged side by side on the transfer conveyor belt E by 180° and transfers them to the second conveyor belt D.

[0033] Specifically, with regard to gluing, the first conveyor belt A crosses the front gluing unit B and the front curing unit C, and the battery cells P on the first conveyor belt A keep the front side facing upward and pass through the front gluing unit B and the front curing unit C one by one, and then after the gluing is completed, the front inspection unit performs visual inspection (the visual camera X obtains information by taking pictures); the second conveyor belt D crosses the back gluing unit E and the back curing unit F, and the battery cells P on the second conveyor belt D keep the back side facing upward and pass through the back gluing unit E and the back curing unit F one by one, and then after the gluing is completed, the back inspection unit performs visual inspection (the visual camera X obtains information by taking pictures).

[0034] In this example, during the specific glue application process, the glue application station is located directly below the glue application tank, and a mesh 10a for fixed-point glue application is formed on the glue application mesh plate 10, and the mesh area formed by the mesh 10a corresponds to two battery cells P; the glue scraping mechanism 2 is installed above the glue application tank 1, and the glue scraping mechanism 2 includes a double scraper assembly 20 that can switch between upper and lower states relative to each other, and a power assembly 21 for driving the double scraper assembly 20 to reciprocate along the length direction of the glue application mesh plate 10.

[0035] In some specific embodiments, the double scraper assembly 20 includes a scraper seat a, a left and right scraper group b installed on the scraper seat a, and the left and right scraper groups b both include a lifting part b1 that can be adjusted up and down, and a scraper b2 installed at the output end of the lifting part b1 and having a length covering the width of the mesh area of ​​the glue-applying mesh plate 10. At the same time, the two scrapers b2 of the left and right scraper groups b gradually open outward from top to bottom, and a glue injection area is formed between the open area and the glue-applying mesh plate 10. When the scraper b2 contacts the glue-applying mesh plate 10 and moves to scrape the glue, the lifting part b1 can also provide power to drive the scraper b2 to be pressed against the glue-applying mesh plate 10 to keep the scraper in single-pass coating in full contact with the glue-applying mesh plate 10.

[0036] In some specific embodiments, the lifting part b1 includes a main regulator b10 and an auxiliary regulator b11 installed on the scraper seat a, wherein the main regulator b10 is used to drive the scraper b2 to move up and down relative to the glue mesh plate 10 to fit and disengage; the auxiliary regulator b11 is installed between the main regulator b10 and the scraper b2 and is used to adjust the drive of the scraper b2 to adapt to the deformation of the glue mesh plate 10. Here, the auxiliary regulator plays a role similar to that of a spring, and can keep the scraper in contact with the glue mesh plate regardless of how the glue mesh plate is deformed. Furthermore, the auxiliary regulator b11 is a telescopic rod controlled by a proportional valve to adjust the power output; the main regulator b10 is used to drive the auxiliary regulator b11 to move up and down. Specifically, the telescopic rod is a cylinder or a hydraulic cylinder, and the supply ratio can be adaptively adjusted according to the proportional valve to provide matching scraper movement to keep the power of the glue mesh plate (in other words, no matter in any position, it is dynamic balanced in the up and down directions, so as to minimize the deformation rate of the glue mesh plate); and the main regulator can use commonly used lifting components (such as: power screw, telescopic cylinder, other linear motion methods). Of course, the main regulator and the auxiliary regulator can also be telescopic rods, wherein the main regulator and the auxiliary regulator share a power source, and the power source adaptively adjusts the output power of the auxiliary regulator based on the pressure change formed by the scraper. Here, the power source can actively change the pressure to meet the adaptive adjustment of the auxiliary regulator output power. The effect formed in this way is better than the elastic pressure formed by the "spring", because the elastic pressure will increase the deformation rate of the glue mesh plate, while the adaptive adjustment is triggered by the deformation of the glue mesh plate itself, resulting in a small deformation rate of the glue mesh plate. That is, the pressure is controlled in real time by adjusting the power flow based on the force change of the scraper to meet the need for uniform scraping.

[0037] Specifically, the bottom of each scraper b2 forms a scraper surface m, wherein the scraper surface m is arranged to intersect with the glue-applying mesh plate 10, and a line-surface contact is formed between the bottom edge of the scraper surface m and the glue-applying mesh plate 10 for scraping glue. Through the line-surface contact, not only the friction between the scraper and the glue-applying mesh plate is reduced, but also the best glue injection area is formed between the other parts of the scraper surface and the glue-applying mesh plate. Therefore, once there is no glue, whether it is manual or automatic, it is necessary to inject the glue into the corresponding glue injection area. At the same time, due to the poor fluidity of the glue and the long scraper, the probability of the glue escaping from the scraper is small. To put it another way, even if a small amount of glue leaks from the end of the scraper, it will not cause interference in the scraping of glue because it is far away from the mesh area. Each scraper b2 includes a knife seat b20 and a knife body b21, wherein the knife body b21 is mounted on the knife seat b20 in a rotationally adjustable manner around its own length direction. In short, its inclination angle can be adjusted to meet other different usage conditions.

[0038] Furthermore, the blade body b21 includes a connecting portion b210 rotatably connected to the blade holder b20, and a blade body b211 detachably mounted on the connecting portion b210 and having a scraper surface m formed at the bottom. The connecting portion b210 limits the inclination angle of the blade body b211 relative to the glue mesh plate 10 through an external component b22 detachably mounted on the blade holder b20. Furthermore, the blade body b211 gradually narrows from top to bottom from the left and right sides, and the angle formed between the scraper surface m formed and the glue mesh plate 10 is smaller than the inclination angle of the blade body itself. Here, based on the formation of the best glue accommodating area between the other parts of the inclined scraper surface and the glue mesh plate, the glue scraping is implemented more evenly (because the glue fills this area first, and as the scraper moves, the glue scraping is performed under the premise of sufficient glue). At the same time, the scraper on the left is tilted to the right, and the scraper on the right is tilted to the left, and the tilt angle is 45-75° (preferably 50-70°), and the angle formed between the scraper surface m and the glue mesh plate 10 is less than 30°. In this example, three positioning holes are provided on the blade holder b20, and the external part b22 is a commonly used bolt part. After the angle is adjusted by rotation, the position is limited based on the positioning hole selected by the external part b22, so that its tilt angle is determined.

[0039] In addition, the power assembly 21 includes a power screw c, a power nut seat d, and a power motor e, wherein the power screw c extends in the left-right direction; the height adjustment mechanism 3 has a similar structure to the power assembly 21, and has a corresponding power screw c1, a power nut seat d1, a power motor e1, and a slide rail h1, wherein the power screw c1 extends in the up-down direction. In addition, whether it is horizontal movement or up-down movement, the slide rail h matched with the power nut seat d can also be used to guide the left-right movement; the slide rail h1 matched with the power nut seat d1 can be used to guide the up-down movement.

[0040] The transfer unit Y includes a first carrier Y1 that can move in the left-right direction; a first picker Y2 installed on the first carrier Y1 and capable of rotating in the left-right direction with a period of 180° and moving up and down; a second carrier Y3 that can move in the up-down and front-to-back directions; and a second picker Y4 installed on the second carrier Y3. The front and back sides are switched based on a 180° flip, and combined with the three-axis movement in the up-down, left-right, and front-to-back directions, the side-by-side battery cells are transferred to the corresponding conveyor belt, and the gluing and curing operations on the front and back sides of the battery cells are completed in a flow-line manner.

[0041] The first material picker Y2 and the second material picker Y4 have similar structures, and both include a material picker arm y1 extending in the left-right direction, and a plurality of negative pressure adsorption heads y2 installed side by side on the material picker arm y1, wherein the plurality of negative pressure adsorption heads y2 constitute an adsorption row, and the negative pressure adsorption heads y2 of the adsorption row are synchronously negatively adsorbed and pressure-released to implement the pick-up and placement of side-by-side battery cells. Negative pressure adsorption is used to pick and place the entire row, and one battery cell corresponds to one negative pressure adsorption head, and of course one battery cell can also correspond to multiple negative pressure adsorption heads (such as: 2, 3 or more). Specifically, the first material picker Y2 has two adsorption rows, and the two adsorption rows are installed in opposite directions on the upper and lower parts of the material picker arm y1. In this way, the first material picker Y2 only needs to flip 180° to continuously pick and place the entire row of battery cells; and the second material picker Y4 can pick materials from above the first material picker Y2 each time, and the battery cell P can be unloaded to the second conveyor belt D below without flipping.

[0042] In this example, the first carrier Y1 is a rectangular frame, and is relatively slidably arranged along a track extending in the left-right direction. At the same time, a telescopic cylinder extending up and down is arranged on the rectangular frame, and the first material grabber Y2 is integrally installed on the moving ends of the two telescopic cylinders, that is, the up and down movement of the first material grabber Y2 is realized by the synchronous telescopic extension of the telescopic cylinders; as for the flipping of the first material grabber Y2 itself, it is realized by a flip shaft and a flip motor, that is, the end of the material grabber arm y1 is installed on the shaft end through the rotation of the flip shaft, and the flip motor is installed on the shaft end, and the telescopic rod also acts on the shaft end. The second carrier Y3 has a moving frame that moves in the up and down direction, and a transmission member of a rack and gear transmission that drives the entire moving frame to move horizontally along the front and back directions. The second material grabber Y4 is installed on the moving frame.

[0043] In addition, the length of the transfer conveyor belt G is shorter than that of the second conveyor belt D, which makes the space layout reasonable and shortens the length of the entire production line. At the same time, the second conveyor belt D is located above the transfer conveyor belt G and the distance is equal to the height change caused by the flipping of the battery cell. In this way, the second picker Y4 only needs to move forward and backward to unload the entire row of battery cells onto the second conveyor belt D.

[0044] The EL detection device ⑤ includes a detection connection belt Q aligned with the second conveyor belt D, a detection manipulator S located above the detection connection belt Q, a detection camera T for acquiring images, and an image analysis unit, wherein the detection manipulator S can switch the battery string between the vertical and horizontal states with a rotation period of 90° around the length direction of the detection connection belt Q. Specifically, the detection manipulator S itself can move in the up and down directions, and at the bottom of the detection manipulator S is provided with a material picking hand s1 that can rotate in a 90° cycle, wherein the structure of the material picking hand s1 is the same as that of the second material picking hand Y4, and it switches between vertical and horizontal under a 90° rotation; as for the detection camera T, it is installed in parallel through a rack. In short, the material picking hand s1 also rotates around the left and right directions through its own material picking arm to form a 90° flip, and then realizes the up and down lifting adjustment based on the cylinders set in the up and down directions, and cooperates with the gears and racks (or telescopic cylinders) based on the left and right movements to realize the movement in the front and back directions, thereby assisting screening.

[0045] The screening device ⑥ includes an NG storage belt J and a discharge conveyor belt K which are arranged side by side with the detection connection belt Q and located on opposite sides of the detection connection belt Q. The detection manipulator S can also move in the width direction of the detection connection belt Q to transfer the detected battery string to the NG storage belt J or the discharge conveyor belt K for screening. The detection connection belt is located above the NG storage belt J and the discharge conveyor belt K, wherein the discharge conveyor belt K can be adjusted along its own width direction; an NG storage belt L which can extend inside and outside the detection connection belt Q is also provided between the NG storage belt J and the detection connection belt Q. Here, based on the dual material connection mode of the storage belt and the storage belt in a limited space, the collection of NG battery strings is facilitated; at the same time, based on the lateral adjustment of the discharge conveyor belt, the adjustment of the output position is met, thereby improving the convenience of discharge.

[0046] In addition, in order to better carry out the layout, two production lines are used in this example to form a symmetrical layout to fill the gap, so as to meet the layout of the two production lines in the rectangular area. Specifically, the two front and back printing glue production lines are side by side in the same rack W; the two front and back printing glue production lines are symmetrically arranged and share the NG storage belt J and NG storage belt; the two front and back printing glue production lines are relatively separated by the temporary storage belt Z, and the detection robot S can transfer the NG battery string from the temporary storage belt Z to the NG storage belt J or NG storage belt L. Based on the dual-line layout, the space can be filled with each other, and NG collection can be carried out on the same side for easy processing. At the same time, in order to distinguish the two production lines, the NG storage belt and the NG storage belt can store their own NG products, so that the product can quickly find the NG location point, which is convenient for manual replacement or other operations.

[0047] In summary, the front and back printing glue stringing process of solar cell includes the following steps: S1, front glue First, the battery string is sent to the glue application station by the first conveyor belt from the front side, and is placed below the glue application mesh plate, and then glue is injected into the glue injection area so that the glue forms a cover in the wide direction of the mesh area; Secondly, when scraping glue to the left, select the right scraper; when scraping glue to the right, select the left scraper, and then switch the two scrapers up and down to form one blocking and one scraping. One of the two scrapers is defined as a scraping knife and the other is defined as an intercepting knife, wherein the intercepting knife is located on the glue-applying mesh plate, and the scraping knife fits the glue-applying mesh plate until the scraping knife scrapes the entire mesh area, and then the intercepting knife moves downward to intercept the glue from moving forward, and the intercepting knife and the scraping knife switch their states; furthermore, the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups, and the scraper can be adjusted in real time as the glue-applying mesh plate is deformed. The one-way lamination and scraping are completed in the pressure formed; at the same time, the first conveyor belt delivers the next batch of batteries to the corresponding glue application station, and then the scraper is switched up and down, and the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups, and the scraper can adjust the pressure formed in real time with the deformation of the glue application mesh plate to complete the return lamination and scraping. That is, the deformation amount of the glue application mesh plate caused by the scraper is relatively eliminated in combination with the reciprocating motion, and two scrapings can be completed in one round trip. After each glue application, the battery cell enters the front curing unit for UV curing, and the glue application position is detected based on the visual camera. S2, split into strings, turn over The end of the battery string transmitted from the first conveyor belt is divided into strings, that is, divided according to the number of battery cells of the set battery string, and after all the battery strings are located on the transfer conveyor belt, the flipping device is used to flip the front and back 180 degrees and transfer them to the second conveyor belt, wherein the battery cells transmitted from the first conveyor belt enter the transfer conveyor belt, and then the whole row of battery strings is adsorbed by the synchronous negative pressure of the adsorption row at the bottom of the first material picking hand on the first carrier, and then turned upward 180 degrees around the left and right directions so that the back of the battery cells faces upward, and moved to the left for the alignment of the second material picking hand, and then the battery string is negatively adsorbed by the second material picking hand by moving forward and backward and transferred to the second conveyor belt; S3, glue on the back The same steps as the front gluing are used to sequentially perform the gluing, scraping and curing, and finally the gluing is transmitted from the second conveyor belt; S4.EL detection When the outgoing battery string moves to the transmission detection belt, the detection manipulator above performs negative pressure adsorption and rotates 90° around the length direction of the detection connection belt to stand the battery string upright, so that the battery string faces the detection camera from the front, and the detection camera acquires and analyzes the image; S5. Screening After the analysis, the battery strings are reset first, and then qualified and unqualified are screened based on the analysis results. The qualified battery strings are transferred horizontally to the discharge conveyor belt, and the unqualified battery strings are transferred horizontally to the NG storage belt.

[0048] In addition, the so-called "one blocking and one scraping" means: intercepting the glue liquid after scraping to prevent it from continuing to move forward due to inertia; scraping means: the movement of the glue-applying mesh plate covers the entire mesh area. At the same time, the specific meaning of "the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups" is: when the scraping movement is to the left, select the scraper on the right; when the scraping movement is to the right, select the scraper on the left. Preferably, the inclination angles of the two scrapers are acute angles, and the inclination angles remain equal. Generally, the inclination angle is between 45 and 75°. Through the decomposition of pressure, part of the pressure to maintain adhesion is formed, and the other part forms the power in the direction of movement, so that the deformation rate of the glue-applying mesh plate caused by the scraper is small.

[0049] Therefore, on the one hand, the present invention is based on the alignment and side-by-side layout of each conveyor belt, and directly moves horizontally for screening after EL detection, so as to shorten the length of the assembly line, realize the assembly line operation of glue stringing on the front and back sides of the battery string in sequence, eliminate the layout space limitation required for the production line, and enhance practicality. At the same time, based on the 90° flip vertical detection, it can accurately screen, and the detection robot can also be used for screening and transfer, optimize the production line structure, and reduce costs; on the other hand, in the glue stringing process, based on the reciprocating motion of the double scraper assembly, the two scrapers switch between the upper and lower positions, and the deformation amount caused by the two scrapers to the glue mesh plate is relatively eliminated and the glue is kept between the two scrapers. Then the glue is scraped twice through the mesh area reciprocatingly, which greatly improves The quality and efficiency of glue scraping are high, and the scraper forms a full-length glue scraping, which not only improves the uniformity of the size of the glue dots, but also reduces the probability of deformation of the glue-applying mesh plate and prolongs the life of the glue-applying mesh plate. In addition, the movable glue injection area can not only inject glue anytime and anywhere, but also squeeze the glue into the corresponding mesh holes while maintaining sufficient glue volume, thereby improving the uniformity of glue application. The third aspect is based on a 180° flip to achieve front and back switching, and combined with the three-axis movement in the up and down, left and right, and front and back directions, the side-by-side battery cells are transferred to the corresponding conveyor belt, and the glue application and curing operations on the front and back of the battery cells are completed in a flow-line manner. At the same time, negative pressure adsorption is used to pick and place the entire row, and one battery cell corresponds to one negative pressure adsorption head, of course, it can also be done in one Each battery cell corresponds to multiple negative pressure suction heads (such as 2, 3 or more); fourthly, the length of the transfer conveyor belt is shorter than that of the second conveyor belt, so that a reasonable spatial layout can be made to shorten the length of the entire production line; the second conveyor belt is located above the side of the transfer conveyor belt and the distance is equal to the height change caused by the flipping of the battery cell. In this way, the second picker only needs to move horizontally back and forth to unload the entire row of battery cells onto the second conveyor belt; fifthly, through the coordinated use of the main regulator and the auxiliary regulator, the auxiliary regulator can adjust the pressure of the scraper on the glue-applying mesh plate according to the control of the proportional valve, and keep the upper and lower directions in a dynamic balance state for glue lamination, so that the effect formed is better than the "elastic" The elastic pressure formed by the "spring" is because the elastic pressure will increase the deformation rate of the glue mesh plate, while the adaptive adjustment is triggered by the deformation of the glue mesh plate itself, resulting in a small deformation rate of the glue mesh plate; the sixth aspect is that through line-surface contact, not only the friction between the scraper and the glue mesh plate is reduced, but also the best glue injection area is formed between the other parts of the scraper surface and the glue mesh plate. Therefore, once there is no glue, whether it is manual or automatic, it is necessary to inject the glue into the corresponding glue injection area. At the same time, due to the poor fluidity of the glue and the long scraper, the probability of glue escaping from the scraper is small. Taking a step back, even if a small amount of glue leaks from the end of the scraper, it will not cause interference in scraping glue because it is far away from the mesh area;The seventh aspect is based on forming the best glue accommodating area between the other parts of the inclined scraper surface and the glue-applying mesh plate, so that the glue is scraped more evenly (because the glue fills this area first, and as the scraper moves, the glue is scraped under the premise of sufficient glue); the eighth aspect is that the scraper on the left is inclined to the right and the scraper on the right is inclined to the left. When scraping glue to the left, the scraper on the right is selected; when scraping glue to the right, the scraper on the left is selected, further explaining and perfecting the meaning of "the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups", and at the same time, the inclination angles of the two scrapers are acute angles, and the inclination angles remain equal, generally between 45 and 75 degrees. Through the decomposition of pressure, part of the pressure to maintain the fit is formed, and the other part forms the power in the direction of movement, so that the deformation rate of the glue-applying mesh plate caused by the scraper is small; the ninth aspect is based on the transmission screw arranged in the left and right directions. Reciprocating drive, height adjustment based on the transmission screw arranged in the up and down directions, not only is it easy to implement, but also has high motion accuracy and is easy to control; the front curing unit and the back curing unit have the same structure, both of which include a curing device located above the conveyor belt. As for the curing device, UV curing, LED curing or other curing can be used to facilitate actual molding processing; the tenth aspect is based on the dual material connection mode of the storage belt and the storage belt in a limited space to facilitate the collection of NG battery strings; at the same time, based on the lateral adjustment of the discharge conveyor belt, the adjustment of the output position is met to improve the convenience of discharge. In addition, based on the double-line layout, the space can be filled with each other, and NG collection can be carried out on the same side for easy processing; at the same time, in order to distinguish the two production lines, the NG storage belt and the NG storage belt can store their own NG products, so that the product can quickly find the NG position point, which is convenient for manual replacement or other operations. ;

[0050] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A front and back printing glue production line for solar cell sheets, comprising a front glue applying device, a string dividing device, a flipping device, a back glue applying device, an EL detection device, and a screening device, wherein the front glue applying device comprises a first conveyor belt, a front glue applying unit, and a front curing unit, and the back glue applying device comprises a second conveyor belt, a back glue applying unit, and a back curing unit. The front glue applying unit and the back glue applying unit have the same structure, both comprising a glue applying groove with a glue applying mesh plate forming the bottom of the groove, and a glue scraping mechanism, characterized in that: The flipping device includes a transfer conveyor belt aligned with the output end of the first conveyor belt and arranged side by side with the second conveyor belt, and a transfer unit that flips the battery sheets arranged side by side on the transfer conveyor belt by 180 degrees and transfers them to the second conveyor belt; The scraping mechanism comprises a double scraper assembly capable of relatively switching states up and down, a power assembly for driving the double scraper assembly to reciprocate along the length direction of the glue-applying mesh plate, the double scraper assembly comprises a scraper seat, and a left and right scraper group mounted on the scraper seat, wherein the two scrapers of the left and right scraper groups and the glue-applying mesh plate constitute a glue injection area, the length of each scraper itself is greater than the width of the mesh area formed by the mesh holes on the glue-applying mesh plate, and the two scrapers gradually open outward from top to bottom and intersect with the glue-applying mesh plate, and during the reciprocating motion of the double scraper assembly, the two scrapers switch between the upper and lower positions, and the deformation amount of the glue-applying mesh plate caused by the two scrapers is relatively eliminated and the glue is kept between the two scrapers, and then reciprocates through the mesh area to implement two times of scraping glue; The EL detection device comprises a detection connection belt aligned with the second conveyor belt, a detection manipulator located above the detection connection belt, a detection camera for acquiring images, and an image analysis unit, wherein the detection manipulator can switch the battery string between an upright state and a horizontal state with a rotation period of 90° around the length direction of the detection connection belt; The screening device includes an NG storage belt and a discharge conveyor belt which are arranged side by side with the detection connection belt and located on opposite sides of the detection connection belt. The detection robot can also move in the width direction of the detection connection belt to transfer the detected battery strings to the NG storage belt or the discharge conveyor belt for screening.

2. The front and back printing glue production line of solar cell according to claim 1, characterized in that: The left and right scraper groups both include a lifting part that can be adjusted up and down, and a scraper installed at the output end of the lifting part, wherein the lifting part can provide power to drive the scraper to be pressed against the glue mesh plate to keep the scraper in full contact with the glue mesh plate during single-pass coating.

3. The front and back printing glue production line of solar cell according to claim 2, characterized in that: The lifting part includes a main regulator and an auxiliary regulator installed on the scraper seat, wherein the main regulator is used to drive the scraper to move up and down relative to the glue applying mesh plate for adhesion and disengagement; the auxiliary regulator is installed between the main regulator and the scraper and is used to adjust the scraper to maintain adaptive adhesion as the glue applying mesh plate deforms.

4. The front and back printing glue production line of solar cell according to claim 3, characterized in that: The main regulator and the auxiliary regulator are both telescopic rods, wherein the main regulator and the auxiliary regulator share a power source, and the power source adaptively adjusts the output power of the auxiliary regulator based on the pressure change formed by the scraper; and / or, the auxiliary regulator is a telescopic rod controlled by a proportional valve to adjust the power output, and the main regulator is used to drive the auxiliary regulator to rise and fall.

5. The solar cell front and back printing glue production line according to claim 1, characterized in that: When scraping glue on the front side, one of the two scrapers is defined as a scraper knife and the other is defined as an intercepting knife. When the scraper knife completes a single-pass scraping, the intercepting knife descends and switches to the scraper knife. The first conveyor belt delivers the glue-applied battery cells to the front curing unit, and the un-glued battery cells are moved to the gluing station; and / or the two scrapers are tilted to the left and right respectively, wherein the tilt angle is an acute angle, and the two tilt angles remain equal.

6. The solar cell front and back printing glue production line according to claim 5, characterized in that: The inclination angle is 45~75°, and when the scraper is moved to the left, the scraper on the right is selected; when the scraper is moved to the right, the scraper on the left is selected; and / or, the bottom of each scraper forms a scraper surface, wherein the scraper surface is arranged to intersect with the glue applying mesh plate, and a line-surface contact for scraping glue is formed between the bottom edge of the scraper surface and the glue applying mesh plate, and the angle formed by the scraper surface and the glue applying mesh plate is smaller than the inclination angle.

7. The solar cell front and back printing glue production line according to claim 1, characterized in that: Each of the scrapers includes a blade seat and a blade body, wherein the blade body is mounted on the blade seat so as to be rotatably adjusted around its own length direction, and the blade body includes a connecting portion rotatably connected to the blade seat, and a blade body which is detachable from the connecting portion and has a scraper surface formed on the bottom, and the connecting portion limits the inclination angle of the blade body relative to the glue mesh plate through an external part detachable from the blade seat.

8. The solar cell front and back printing glue production line according to claim 1, characterized in that: The string dividing device is located between the first conveyor belt and the transfer conveyor belt, and divides the battery string according to the set number of battery cells; and / or, the transfer unit includes a first carrier that can move along the left-right direction; a first material picker installed on the first carrier and can rotate around the left-right direction with a period of 180° and move up and down; a second carrier that can move along the up-down and front-back directions; And a second material picker installed on the second carrier; and / or, the length of the transfer conveyor belt is smaller than the length of the second conveyor belt; and / or, the second conveyor belt is located above the side of the transfer conveyor belt and the distance is equal to the change in height formed by the flipping of the battery cell.

9. The solar cell front and back printing glue production line according to claim 8, characterized in that: The structures of the first material picking arm and the second material picking arm are similar, and both include a material picking arm extending along the left-right direction, and a plurality of negative pressure adsorption heads installed side by side on the material picking arm, wherein the plurality of negative pressure adsorption heads constitute an adsorption row, and the negative pressure adsorption heads of the adsorption row perform synchronous negative pressure adsorption and pressure release to implement the picking and placing of side-by-side battery cells.

10. The solar cell front and back printing glue production line according to claim 9, characterized in that: The first material taking arm has two adsorption rows, and the two adsorption rows are installed in opposite directions on the upper and lower parts of the material taking arm.

11. The solar cell front and back printing glue production line according to claim 1, characterized in that: The front curing unit and the back curing unit have the same structure and both include a curing device located above the conveyor belt, and a visual inspection camera is also provided at the conveyor belt outlet of each curing unit; and / or, the power assembly includes a power screw, a power nut seat, and a power motor, wherein the power screw extends in the left and right directions; and / or, the front gluing device also includes a height adjustment mechanism for driving the front gluing unit to adjust the position of the gluing mesh plate in the up and down directions; the back gluing device correspondingly forms the same height adjustment mechanism.

12. The solar cell front and back printing glue production line according to claim 1, characterized in that: The detection connection belt is located above the NG storage belt and the discharge conveyor belt, wherein the discharge conveyor belt can be adjusted along its own width direction; an NG storage belt that can extend inward and outward of the detection connection belt is also provided between the NG storage belt and the detection connection belt.

13. The solar cell front and back printing glue production line according to claim 12, characterized in that: The two front and back printing glue string production lines are arranged side by side in the same frame; the two front and back printing glue string production lines are symmetrically arranged and share the NG storage belt and / or NG storage belt; the two front and back printing glue string production lines are relatively separated by a temporary storage belt, and the detection robot can transfer the NG battery string from the temporary storage belt to the NG storage belt or NG storage belt.

14. A process for printing glue on the front and back of a solar cell, characterized in that: It adopts the front and back printing glue production line of any one of claims 1 to 13 for solar cell sheets, and comprises the following steps: S1, front glue First, the battery string is sent to the glue application station by the first conveyor belt from the front side, and is placed below the glue application mesh plate, and then glue is injected into the glue injection area so that the glue forms a cover in the wide direction of the mesh area; Secondly, when scraping glue to the left, select the right scraper; when scraping glue to the right, select the left scraper, and then switch the two scrapers up and down to form one blocking and one scraping, one of the two scrapers is defined as a scraping knife, and the other is defined as an intercepting knife, wherein the intercepting knife is located on the glue applying mesh plate, and the scraping knife fits the glue applying mesh plate until the scraping knife scrapes the entire mesh area, then the intercepting knife moves downward to intercept the glue from moving forward, and the intercepting knife and the scraping knife switch their states; furthermore, the direction of the scraping movement is opposite to the inclination direction of the selected left and right scraper groups, and the scraper can move along the glue applying mesh. The one-way lamination and scraping of glue is completed in the pressure formed by the real-time adjustment of the plate deformation; at the same time, the first conveyor belt sends the next batch of batteries to the corresponding glue application station, and then the scraper switches up and down, and continues to move in the opposite direction of the scraping movement direction and the tilt direction of the selected left and right scraper groups, and the return lamination and scraping of glue is completed in the pressure formed by the real-time adjustment of the scraper with the deformation of the glue application mesh plate, that is, the deformation amount of the glue application mesh plate caused by the scraper is relatively eliminated in combination with the reciprocating motion, and two scrapings can be completed in one round trip, and the battery cell after each glue application enters the front curing unit for UV curing; S2, split into strings, turn over The end of the battery string transmitted from the first conveyor belt is divided into strings, that is, divided according to the number of battery cells of the set battery string, and after all the battery strings are located on the transfer conveyor belt, the flipping device is used to flip the front and back 180 degrees and transfer them to the second conveyor belt, wherein the battery cells transmitted from the first conveyor belt enter the transfer conveyor belt, and then the whole row of battery strings is adsorbed by the synchronous negative pressure of the adsorption row at the bottom of the first material picking hand on the first carrier, and then turned upward 180 degrees around the left and right directions so that the back of the battery cells faces upward, and moved to the left for the alignment of the second material picking hand, and then the battery string is negatively adsorbed by the second material picking hand by moving forward and backward and transferred to the second conveyor belt; S3, glue on the back The same steps as the front gluing are used to sequentially perform the gluing, scraping and curing, and finally the gluing is transmitted from the second conveyor belt; S4.EL detection When the outgoing battery string moves to the transmission detection belt, the detection manipulator above performs negative pressure adsorption and rotates 90° around the length direction of the detection connection belt to stand the battery string upright, so that the battery string faces the detection camera from the front, and the detection camera acquires and analyzes the image; S5. Screening After the analysis, the battery strings are reset first, and then qualified and unqualified are screened based on the analysis results. The qualified battery strings are transferred horizontally to the discharge conveyor belt, and the unqualified battery strings are transferred horizontally to the NG storage belt.

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