Front and back surface printing and glue stringing equipment for solar cells

Abstract

The invention relates to front and back surface printing and glue stringing equipment for solar cells. The front and back surface printing and glue stringing equipment comprises a front surface forming device, a turnover device and a back surface forming device, on the basis of the overturning device, the front and back forming devices are connected and the front and back surfaces of the battery string are overturned, so that the length of a forming assembly line is greatly shortened, the layout space limitation required by equipment is eliminated, and the practicability is enhanced; on the other hand, each sizing process is based on the reciprocating motion of the double-scraper assembly, the two scrapers are switched between the upper position and the lower position, the deformation quantity of the sizing mesh plate caused by the two scrapers is relatively eliminated, and the glue is kept between the two scrapers to pass through a mesh area in a reciprocating manner to be scraped twice, so that the quality and the efficiency of glue scraping are greatly improved, and the production efficiency is improved. Meanwhile, the scraping knife forms whole-process fitting glue scraping, the deformation probability of the glue applying mesh plate is small, the service life of the glue applying mesh plate is prolonged, in addition, a movable glue injection area is arranged, glue injection operation can be conducted anytime and anywhere, glue applying is conducted under the condition that the glue amount is kept sufficient, and the glue applying uniformity is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a front-back side printing and glue stringing device for a solar cell sheet. 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 printing and gluing of the front and back sides of 0BB solar cells, the production line operation is basically adopted, firstly, the front side is glued and cured; then the strings are divided and turned over; finally, the back side is glued and cured to form the required printed circuit. However, there are the following defects in actual operation: 1) For glue application (whether it is the front or back), the fixed-point glue application method mainly uses a glue application station composed of a steel plate, a fixed-point glue application hole is formed on the steel plate, and then the glue is injected and the scraper is moved horizontally to scrape the steel plate surface, gradually scraping the glue into the fixed-point glue application hole and squeezing it onto the aligned battery cells below, and then curing (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 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. 2) The layout of the printing glue stringing equipment used is basically arranged from back to front in sequence and is in an assembly line type, that is, the gluing and curing operation lines for front and back printing are long, which cannot meet the needs of many manufacturers who cannot have a normal layout due to limited workshop area, greatly reducing the practicality of the printing glue stringing equipment. Summary of the invention

[0004] 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 stringing device for solar cell sheets, which is particularly suitable for 0BB battery structure.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A front and back printing glue stringing device for solar cell sheets, comprising a front molding device, a flipping device, and a back molding device, wherein the front molding device comprises a first conveyor belt, a front glue applying unit, and a front curing unit, and the back molding 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 glue scraping mechanism includes a double scraper assembly that can switch between upper and lower states relative to each other, and 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 includes a scraper seat, and left and right scraper groups installed 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. 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 it reciprocates through the mesh area to implement two glue scraping operations.

[0006] According to a specific implementation and preferred aspect of the present invention, the transfer unit includes a first carrier that can move in the left-right direction; a first picker mounted on the first carrier and capable of rotating around the left-right direction with a period of 180° and moving up and down; a second carrier that can move in the up-down and front-back directions; and a second picker mounted on the second carrier. The front-back switching is achieved based on the 180° flip, and combined with the three-axis movement in the up-down, left-right, and front-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 of the battery cells are completed in a flow-line manner.

[0007] 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).

[0008] In some specific embodiments, 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.

[0009] According to another specific implementation and preferred aspect of the present invention, the length of the transfer conveyor belt is shorter than that of the second conveyor belt, so as to achieve a reasonable spatial layout and shorten the length of the entire production line.

[0010] Preferably, the second conveyor belt is located above and to the side of the transfer conveyor belt and the distance is equal to the height change formed by the flipping of the battery cell. In this way, the second picker only needs to move forward and backward to unload the entire row of battery cells onto the second conveyor belt.

[0011] 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.

[0012] Preferably, 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 mesh plate for bonding and disengagement; the auxiliary regulator is installed between the main regulator and the scraper and is used to adjust the scraper to maintain adaptive bonding as the glue mesh plate deforms.

[0013] Furthermore, 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).

[0014] Alternatively, 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 auxiliary regulator output power 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 (in short, keep the forces in the up and down directions in a dynamic balance state to complete the laminating and scraping of 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. 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 needs of uniform scraping of glue.

[0015] 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.

[0016] 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 about 20°. 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.

[0017] 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.

[0018] In addition, 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 molding device also includes a height adjustment mechanism for adjusting the position of the glue mesh plate in the up-down direction by driving the glue application unit. That is, the power screw and the power nut seat form a transmission screw, and the height adjustment mechanism can use the same power assembly as the transmission screw, and for ease of implementation, a slide rail in the same direction as the screw can be used to form a motion guide.

[0019] Preferably, the front curing unit and the back curing unit have the same structure, and both include a curing device located above the conveyor belt. The curing device may adopt UV curing, LED curing or other curing methods.

[0020] 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 printed circuit gluing and curing molding, the fixed-point gluing method mainly uses a gluing station composed of a steel plate, a fixed-point gluing hole is formed on the steel plate, and then the glue is injected and the scraper is moved horizontally to scrape the steel plate surface to gradually scrape the glue into the fixed-point gluing hole and squeeze it onto the aligned battery cell below, and then solidify. 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 and then the next scraping is performed. Moreover, the deformation caused by unidirectional scraping is also unidirectional, resulting in deformation of the steel plate. The amount cannot effectively complement each other, thus greatly shortening the service life of the steel plate; at the same time, one-way scraping also has a glue injection problem, because each time it is necessary to form glue injection on the moving side of the scraper, so the scraping efficiency is low; in addition, the layout of the adopted printing glue stringing equipment is basically arranged from back to front in sequence and in an assembly line type, that is, the front and back printing glue application and curing operation lines are long, which cannot meet the needs of many manufacturers who cannot have a normal layout due to limited workshop area, greatly reducing the practicality of the printing glue stringing equipment and other shortcomings. The present invention cleverly solves various deficiencies of the existing structure by overall design of the front and back printing glue stringing equipment for solar cells. After adopting the printing glue stringing equipment, firstly, based on the transmission of the first conveyor belt, the front side is glued and cured; secondly, the flipping device is used to flip the front and back sides 180 degrees and transfer them to the second conveyor belt; finally, the back side is glued and cured under the transmission of the second conveyor belt to complete the front and back side printing glue application of the solar cell. Therefore, on the one hand, the present invention connects the front and back side molding devices with two lines and flips the front and back sides based on the flipping device, so as to greatly shorten the length of the molding line, eliminate the layout space limitation required for the printing glue stringing equipment, and enhance practicality; on the other hand, each gluing process is based on the double scraper assembly The parts move back and forth, and the two scrapers switch between the upper and lower positions. 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. Then the glue is scraped twice through the mesh area, which greatly improves the quality and efficiency of the glue scraping. At the same time, the scraper forms a full-length glue-fitting scraping, which not only improves the uniformity of the size of the formed glue spots, 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 under the same and sufficient glue mode to improve the uniformity of glue application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the glue stringing equipment for printing the front and back sides of the solar cell of this embodiment; Figure 2 for Figure 1 A schematic diagram of the main view; Figure 3 for Figure 1 A schematic diagram of the structure of the middle front side forming device; Figure 4 for Figure 3 The structural diagram of the middle glue application unit; Figure 5 for Figure 4 Structural diagram of the middle scraper mechanism; Figure 6 for Figure 5 A schematic diagram of the main view; Figure 7 for Figure 5 Schematic diagram of the left side; Figure 8 for Figure 5 Schematic diagram of partial structural decomposition; Wherein: ①, surface forming 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, flip device; D, second conveyor belt; E, back glue application unit; F, back curing unit; ③, back molding device; G, transfer conveyor belt; Y, transfer unit; Y1, first carrier; Y2, first pick-up arm; Y3, second carrier; Y4, second pick-up arm; y1, pick-up arm; y2, negative pressure adsorption head; P. Battery cell. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] like Figures 1 to 8As shown, the front and back printing glue stringing equipment of the solar cell sheet of this embodiment includes a front forming device ①, a turning device ②, and a back forming device ③, wherein the front forming device ① includes a first conveyor belt A, a front glue applying unit B, and a front curing unit C, and the back forming device ③ includes a second conveyor belt D, a back glue applying unit E, and a back curing unit F, wherein the front glue applying unit B and the back glue applying unit E have the same structure, both of which include a glue applying groove 1 with a glue mesh plate 10 forming a groove bottom, a glue scraping mechanism 2, and a height adjustment mechanism 3 that drives the glue applying groove 1 and the glue scraping mechanism 2 to adjust the position of the glue mesh plate 10 in the up and down directions; the front curing unit C and the back curing unit F have the same structure.

[0029] Specifically, 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 up and pass through the front gluing unit B and the front curing unit C one by one; 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 up and pass through the back gluing unit E and the back curing unit F one by one; the flipping device ② includes a transfer conveyor belt G that is aligned with the output end of the first conveyor belt A and arranged side by side with the second conveyor belt D, and a transfer unit Y that flips the battery cells side by side on the transfer conveyor belt E by 180° and transfers them to the second conveyor belt D.

[0030] In some specific embodiments, 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.

[0031] In this example, 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.

[0032] 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 glue mesh plate in contact with the power (in other words, no matter in any position, it is dynamic balanced in the up and down directions, so that the deformation rate of the glue mesh plate is minimized); 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 glue scraping.

[0033] 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.

[0034] 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 in 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In summary, the implementation process of this embodiment is as follows: S1, front glue Firstly, based on the transmission of the first conveyor belt, the front side is glued and cured, wherein the battery cells are sent side by side into the glue application station below the glue application mesh plate, and glue is injected into the open area of ​​the two scrapers and the glue injection area between the glue application mesh plates; then, when scraping the glue to the left, the right scraper is selected; when scraping the glue to the right, the left scraper is selected, and then the two scrapers are switched up and down to form one blocking and one scraping, wherein 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 application mesh plate, and the scraping knife is attached to the glue application mesh plate until the scraping knife has scraped 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, in the direction of the scraping movement, The direction of the scraping movement is opposite to the tilt direction of the selected left and right scraper groups, and the one-way lamination scraping is completed in the pressure formed by the scraper being able to adjust in real time as the glue mesh plate is deformed; at the same time, the first conveyor belt delivers the next batch of batteries to the corresponding glue application station, and the scraper is then switched up and down, and the direction of the scraping movement is continued to be opposite to the tilt direction of the selected left and right scraper groups, and the return lamination scraping is completed in the pressure formed by the scraper being able to adjust in real time as the glue mesh plate is deformed, that is, the deformation amount caused by the scraper to the glue mesh plate is relatively eliminated in combination with the reciprocating motion, and two scrapings can be completed in one round trip, and the battery sheet after each glue application enters the front curing unit for UV curing (or LED curing or other curing); S2, flip reprint The flip device is used to flip the front and back sides 180° and transfer them to the second conveyor belt, where the battery cells 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 picker on the first carrier, and then flipped upward 180° around the left and right directions so that the back of the battery cells face up, and moved to the left for the alignment of the second picker, and then the second picker moves forward and backward to negatively adsorb the battery string and transfer it to the second conveyor belt; S3, back glue The same steps as the front glue application are adopted to sequentially perform glue injection, glue scraping and curing, and finally the glue is transmitted by the second conveyor belt to complete the front and back printing glue application of the solar cell sheet.

[0040] 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.

[0041] Therefore, after adopting the printing glue stringing equipment, firstly, based on the transmission of the first conveyor belt, the front side is glued and cured; secondly, the flipping device is used to flip the front and back sides 180° and transfer them to the second conveyor belt; finally, the back side is glued and cured under the transmission of the second conveyor belt to complete the front and back side printing glue application of the solar cell. Therefore, on the one hand, the present invention connects the two lines of the front and back side molding devices and flips the front and back sides based on the flipping device, so as to greatly shorten the length of the molding assembly line, eliminate the layout space limitation required for the printing glue stringing equipment, and enhance practicality; on the other hand, each gluing process is based on the reciprocating motion of the double scraper assembly, the two scrapers switch between the upper and lower positions, and the deformation caused by the two scrapers to the glue mesh plate is relatively eliminated and the glue is kept in The two scrapers then reciprocate through the mesh area to implement two times of scraping glue, which greatly improves the quality and efficiency of scraping glue. At the same time, the scrapers form full-length glue adhesion, which not only improves the uniformity of the size of the formed glue spots, but also reduces the probability of deformation of the glue-applied mesh plate and extends the life of the glue-applied 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 in the same and sufficient glue mode to improve the uniformity of glue application; the third aspect is based on 180° flipping to achieve front and back side 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 sides of the battery cells are completed in a flow-line manner; at the same time, negative pressure adsorption is used to take and place the entire row, And one battery cell corresponds to one negative pressure adsorption head, of course, one battery cell can also correspond to multiple negative pressure adsorption heads (such as: 2, 3 or more); fourthly, the length of the transfer conveyor belt is less than the length of the second conveyor belt, so that a reasonable spatial layout can shorten the length of the entire production line; the second conveyor belt is located on the upper side of the transfer conveyor belt and the distance is equal to the change in height formed by the flipping of the battery cell. In this way, the second material 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 laminating and scraping the glue, so The effect formed 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; 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. Even if a small amount of glue leaks out from the end of the scraper, it will not cause interference in scraping glue because it is far away from the mesh area.In the seventh aspect, the best glue accommodating area is formed 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); in the eighth aspect, 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, one The general inclination angle is between 45 and 75 degrees. Through the decomposition of pressure, part of it forms the pressure to maintain the fit, and the other part forms the power in the direction of movement, so that the deformation rate of the squeegee mesh plate caused by the scraper is small; the ninth aspect is based on the reciprocating drive of the transmission screw arranged in the left and right directions, and the height adjustment is based on the transmission screw arranged in the up and down directions. It is not only convenient to implement, but also has high movement accuracy and is easy to control; the tenth aspect is that 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. ;

[0042] 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 stringing device for solar cell sheets, comprising a front molding device, a turning device, and a back molding device, wherein the front molding device comprises a first conveyor belt, a front glue applying unit, and a front curing unit, and the back molding device comprises a second conveyor belt, a back glue applying unit, and a back curing unit, and 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, 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 includes a double scraper assembly that can switch between upper and lower states relative to each other, and 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 includes a scraper seat, and left and right scraper groups installed 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. 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 it reciprocates through the mesh area to implement two scraping operations.

2. The front and back printing glue stringing equipment of solar cell according to claim 1, characterized in that: The transfer unit comprises a first carrier capable of moving in the left-right direction; a first material picker mounted on the first carrier capable of rotating in the left-right direction with a period of 180° and moving up and down; and a second carrier capable of moving in the up-down and forward-backward directions; And a second material taking arm installed on the second carrier.

3. The front and back printing glue stringing equipment of solar cell according to claim 2, 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.

4. The front and back printing glue stringing equipment of solar cell according to claim 3, 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.

5. The front and back printing glue stringing equipment of solar cell according to claim 1, characterized in that: The length of the transfer conveyor belt is less than that of the second conveyor belt; and / or, the second conveyor belt is located above and to the side of the transfer conveyor belt and the distance is equal to the height change formed by the flipping of the battery cell.

6. The front and back printing glue stringing equipment 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.

7. The front and back printing glue stringing equipment of solar cell according to claim 6, 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.

8. The front and back printing glue stringing equipment of solar cell according to claim 7, characterized in that: 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; or, 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 changes formed by the scraper.

9. The front and back printing glue stringing equipment of solar cell 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.

10. The front and back printing glue stringing equipment of solar cell according to claim 9, 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 intersected 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.

11. The solar cell front and back printing glue stringing equipment 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.

12. The front and back printing glue stringing equipment of solar cell according to claim 1, characterized in that: 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 forming 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, and the back forming device is correspondingly formed with a height adjustment mechanism; and / or the front curing unit and the back curing unit have the same structure, and both include a curing device located above the conveyor belt.

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