Battery piece back surface film covering device

Abstract

The utility model provides a battery piece back surface film covering device, which comprises a film cutting and conveying device and a back surface adhesive film carrying device, the back surface adhesive film carrying device is used for translating and adhering an adhesive film on an adhesive film conveying platform to the back surface of a battery piece, and the film cutting and conveying device comprises an adhesive film adsorption turntable, an adhesive film transverse cutting mechanism and an adhesive film conveying platform, the adhesive film transverse cutting mechanism is provided with a first cutting knife, the first cutting knife can cut off an adhesive film at a gap between two adjacent adsorption surfaces of the adhesive film adsorption rotating column, the adhesive film conveying platform is used for bearing and conveying an adhesive film section, and the back adhesive film carrying device is provided with a first adhesive film carrying hand and a second adhesive film carrying hand; the adhesive films are arranged on the back faces of the battery pieces and do not correspond to the welding strip hold-down tools in position. The first adhesive film carrying hand and the second adhesive film carrying hand are adopted for horizontally moving, carrying and attaching the adhesive films inside and outside the area occupied by the welding strip pressing tool, the adhesive films are attached more smoothly, and position deviation and bubbles of the adhesive films in the re-pressing process are prevented.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell string manufacturing technology, specifically to a device for coating the back of a cell. Background Technology

[0002] During the stringing process of photovoltaic module cells, solder ribbons need to be attached to the grid lines on the surface of the cells to conduct the electrical energy generated by the cells. Common methods for positioning solder ribbons on the surface of the cells include welding, dispensing adhesive, and applying adhesive film.

[0003] In existing battery stringing technologies, the adhesive film is typically fed in a roll, then cut and transported to achieve the desired length. It is then directly pressed and attached to the surface of the battery cell to position the solder ribbon. Patent application CN202311187472.8 discloses a rotating adhesive tape application mechanism that forms adhesive film segments of the target length and directly attaches them to the surface of the battery cell below. However, in practical applications, the inventors discovered that this method of directly pressing and attaching the cut adhesive film segments to the surface of the battery cell easily leads to crushing and damage to the battery cell (due to stress concentration at the contact points caused by the rotation of the rotating cylinder), reducing the performance of the battery string and product quality. For bonding and fixing the solder ribbons on the back of the battery cell using an adhesive film, in order to ensure the relatively stable position of the solder ribbons during the adhesive film adhesion process, a solder ribbon press is first used to press and position the solder ribbons on the back of the battery cell before the adhesive film is adhered. The adhesive film has a portion corresponding to the area of ​​the solder ribbon press and a portion outside the area held by the solder ribbon press. When adhering the adhesive film, the portion of the adhesive film not occupied by the solder ribbon press is adhered first. The unadheded free portion is then re-pressed with a roller after the solder ribbon press is removed to achieve adhesion and positioning of the solder ribbon. In this method, the unadheded free portion has a warping phenomenon, which leads to inaccurate adhesion position and the possibility of air bubbles during re-pressing, thus reducing the adhesion quality. Utility Model Content

[0004] The battery cell back coating device designed in this utility model can overcome the shortcomings of the prior art, which is that when the welding strip is positioned by the welding strip press, the unattached free part of the adhesive film after the welding strip is removed will have a warping phenomenon, which will lead to inaccurate adhesion position and the possibility of air bubbles during repressing, resulting in low adhesion quality.

[0005] The purpose of this utility model is to provide a back-side coating device for battery cells, including a film cutting and conveying device and a film translation and transporting device. The film translation and transporting device is used to translate and adhere the film from the film transport platform to the back side of the battery cells on the string platform. The film cutting and conveying device includes a film adsorption turntable, a film transverse cutting mechanism, and a film transport platform. The film adsorption turntable has a polygonal cross-section film adsorption rotating column. The film transverse cutting mechanism has a first cutting blade, which can cut adjacent two... The adhesive film is cut at the gap position between the adsorption surfaces. The adhesive film transport platform is located below the adhesive film adsorption rotating column to receive and transport the adhesive film segments released from the adsorption surface on the lower side of the adhesive film adsorption rotating column. The adhesive film translation and transport device includes a back adhesive film transport device. The back adhesive film transport device has a first adhesive film transporter and a second adhesive film transporter. The first adhesive film transporter is used to transport and adhere the adhesive film on the back of the battery cell that does not correspond to the position of the solder strip clamp. The second adhesive film transporter is used to transport and adhere the adhesive film on the back of the battery cell that corresponds to the position of the solder strip clamp.

[0006] In some embodiments, the first film transporter has four adsorption strips, namely a first adsorption strip, a second adsorption strip, a third adsorption strip, and a fourth adsorption strip, and the spacing between the adsorption strips in the first film transporter can be adjusted at least partially along the battery cell transport direction of the string platform; and / or, the second film transporter has two adsorption strips, namely a fifth adsorption strip and a sixth adsorption strip.

[0007] In some embodiments, the second film transporter is provided with a third longitudinal cylinder, which is used to drive the fifth and sixth adsorption strips to move synchronously.

[0008] In some embodiments, the first adsorption strip, the second adsorption strip, and the third adsorption strip are connected as a whole by a first connecting plate. The first film transporter is also provided with a first longitudinal movement cylinder. The fixed end of the first longitudinal movement cylinder is fixedly connected to the fourth adsorption strip, and the telescopic end of the first longitudinal movement cylinder is fixedly connected to the third adsorption strip.

[0009] In some embodiments, the first film transporter is further provided with a second longitudinal cylinder, which is used to drive the fourth adsorption strip to move horizontally.

[0010] In some embodiments, the film transport platform includes a film conveyor belt, tension rollers, and a vacuum adsorption plate. The tension rollers are at least two in number and are horizontally spaced apart. The film conveyor belt is wrapped around and tensioned on the two tension rollers. The film conveyor belt has ventilation holes that penetrate both sides of its thickness. The vacuum adsorption plate is located below the load-bearing conveying surface of the film conveyor belt to create negative pressure at the ventilation holes.

[0011] In some embodiments, the film transport platform also has a heating structure to heat the film on the film conveyor belt.

[0012] In some embodiments, the film transverse cutting mechanism further includes at least one second cutting blade, which is capable of cutting the film on the adsorption surface of the film adsorption rotating column corresponding to its position into at least two segments.

[0013] In some embodiments, the film cutting and conveying device further includes a film feeding mechanism and a film longitudinal cutting and slitting mechanism. The film feeding mechanism contains a film roll, and the film strip on the film roll can be introduced into the film longitudinal cutting and slitting mechanism and cut into preset roots along the width direction of the film roll. The film strip cut into preset roots is then guided to the adsorption surface of the film adsorption rotating column after being slid back and forth multiple times along the width of the film.

[0014] In some embodiments, the film feeding mechanism includes a film welding component and a roll detection mechanism. The film welding component is located on the film transport path between the film roll and the roll detection mechanism, and is used to weld the free ends of two upstream and downstream sections of film. The film welding component includes a receiving plate and a welding plate arranged opposite to each other. An adsorption limiting groove is formed on the bearing surface of the receiving plate. The adsorption limiting groove is used to adsorb and limit the upstream and downstream film. The roll detection mechanism is used to detect the remaining amount of film in the film roll.

[0015] The present invention relates to a battery cell back-side coating device, which includes a back-side adhesive film transport device equipped with a first adhesive film transporter and a second adhesive film transporter. This device can separately transport the adhesive film in the area occupied by the solder ribbon press on the back of the battery cell and in the area outside the area occupied by the solder ribbon press, thereby significantly improving the efficiency and quality of adhesive film adhesion on the back of the battery cell. Since the first adhesive film transporter and the second adhesive film transporter are used to separately transport and attach the adhesive film in the area occupied by the solder ribbon press and in the area outside the area occupied by the solder ribbon press, the adhesive film adhesion is smoother and there is no warping of the adhesive film in the prior art. There is no need to repress the free section of the adhesive film, thereby effectively preventing the positional deviation of the adhesive film and the generation of air bubbles during the repressing process. Attached Figure Description

[0016] Figure 1 This is a side view of the battery cell coating device in an embodiment of the present invention, wherein some components, such as the back adhesive film conveying device, are not shown.

[0017] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0018] Figure 3 yes Figure 1 A partial structural schematic diagram of the film conveying device;

[0019] Figure 4 yes Figure 1 A three-dimensional structural diagram of the longitudinal cutting and spacing mechanism for the adhesive film;

[0020] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0021] Figure 6 yes Figure 1 A schematic diagram showing the interaction between the rotating adsorption plate and the spacing roller on the film adsorption rotating column.

[0022] Figure 7 yes Figure 1 A schematic diagram showing the relative positions of the film adsorption rotating column and the film transverse cutting mechanism.

[0023] Figure 8 yes Figure 4 A three-dimensional structural diagram of the cutting component;

[0024] Figure 9 yes Figure 8 A magnified view of a section at point C;

[0025] Figure 10 yes Figure 1 Side view of the film transport platform in the middle;

[0026] Figure 11 yes Figure 10 A three-dimensional structural diagram of the film transport platform, omitting components such as the film conveyor belt;

[0027] Figure 12 yes Figure 1 A three-dimensional structural diagram of the adhesive film welding component in the diagram;

[0028] Figure 13 yes Figure 12 A three-dimensional structural diagram of the supporting plate in the middle;

[0029] Figure 14 This is a side view of the adhesive film translation and conveying device in an embodiment of this utility model;

[0030] Figure 15 yes Figure 14 A three-dimensional structural diagram of the first transporter in the process;

[0031] Figure 16 yes Figure 15 A bottom view;

[0032] Figure 17 yes Figure 14 The first transporter in the process has four adsorption strips with three spacing states, namely state 1, state 2 and state 3.

[0033] Figure 18 yes Figure 14 A three-dimensional structural diagram of the second transporter in the diagram;

[0034] Figure 19 yes Figure 18 A bottom view.

[0035] In the diagram: 11. Adhesive film adsorption rotating column; 111. Rotating adsorption plate; 1111. Limiting groove; 1112. Cutting groove; 112. Control panel; 12. Adhesive film transverse cutting mechanism; 121. First cutting blade; 122. Second cutting blade; 123. Adhesive film holding component; 13. Adhesive film transport platform; 131. Adhesive film conveyor belt; 132. Tensioning roller; 133. Vacuum adsorption plate; 134. Rotary drive motor; 14. Rotating column position adjustment mechanism; 2. Adhesive film feeding mechanism; 21. Adhesive film roll; 22. Adhesive film welding component; 221. Receiving plate; 2211. Adhesion limiting groove; 2212. Welding groove; 222. Welding plate; 223. Welding plate moving drive cylinder; 23. Material roll detection mechanism; 3. Adhesive film longitudinal cutting and spacing mechanism; 31. Cutting component; 311 311. First cutting roller; 312. Second cutting roller; 313. Cutting groove; 314. Longitudinal cutting blade; 32. Splitting component; 321. Splitting roller; 3211. Limiting ring; 322. Splitting brush; 3221. Brush rod; 33. Traction roller; 34. Guide roller; 41. First film transporter; 411. First adsorption strip; 412. Second adsorption strip; 413. Third adsorption strip; 414. Fourth adsorption strip; 415. First connecting plate; 416. First longitudinal movement cylinder; 417. Second longitudinal movement cylinder; 418. First frame; 419. First sliding guide post; 42. Second film transporter; 421. Fifth adsorption strip; 422. Sixth adsorption strip; 423. Third longitudinal movement cylinder; 424. Second connecting plate; 425. Second frame; 426. Second sliding guide post. Detailed Implementation

[0036] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, for clarity, the thickness of regions and layers is exaggerated. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed descriptions will be omitted.

[0037] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0038] The following example describes a battery cell back-side coating device of this utility model. This example is only a part of the embodiments of this utility model, but the protection scope of this utility model is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the protection scope of this utility model.

[0039] Please refer to the reference. Figures 1 to 19According to an embodiment of the present invention, a film cutting and transporting device is provided, including a film adsorption turntable, a film transverse cutting mechanism 12, and a film transport platform 13. The film adsorption turntable has a film adsorption rotating column 11 with a polygonal cross-section. The film transverse cutting mechanism 12 has a first cutting blade 121, which can cut the film corresponding to the gap position between two adjacent adsorption surfaces of the film adsorption rotating column 11. The film transport platform 13 is located below the film adsorption rotating column 11 to receive and transport the film segments released from the adsorption surface of the film adsorption rotating column 11 on the lower side. It should be noted that the aforementioned film transverse cutting mechanism 12 can cut the film into film segments of target length along a direction perpendicular to the length direction of the film (i.e., its transport direction). The aforementioned film adsorption rotating column 11 can specifically adopt a hexagonal adsorption rotating body already available in the prior art. In a specific embodiment, the outer peripheral wall of the film adsorption rotating column 11 has a rotating adsorption plate 111. Under the drive control of the rotating drive motor 134 and the lifting mechanism, the film adsorption rotating column 11 can rotate around its axis by a certain angle and rise and fall, thereby realizing the position adjustment of each face of the polygon. The film adsorption rotating column 11 is also equipped with a control disk 112. The control disk 112 is used to controllably communicate with a negative pressure source (e.g., a vacuum pump) to control the vacuum on / off of the vacuum adsorption holes on the rotating adsorption plates 111 on each face of the polygon, thereby controlling the adsorption of the film or film segments on the adsorption surface of the rotating adsorption plate 111. It can be understood that when the film is adsorbed by vacuum (negative pressure), along with the rotation of the film adsorption rotating column 11, it can form a traction on the entire film. At the same time, the film segments formed after the film is cut by the aforementioned first cutting blade 121 can be transported and transferred along the circumferential direction of the film adsorption rotating column 11.

[0040] In this technical solution, the adhesive film is cut into segments by the first cutting blade 121 on the adhesive film adsorption rotating column 11 and then transferred to the adhesive film transport platform 13 located below the adhesive film adsorption rotating column 11 for turnover. The adhesive film transport device can be used to adhere the prepared adhesive film segments to the surface of the battery cells on the stringing platform in a translational manner. This can help to avoid the stress concentration that occurs when the adhesive film segments are directly adhered to the surface of the battery cells after preparation by the existing rotary tape application mechanism, which can damage the battery cells. This improves the stringing qualification rate of the battery cells, thereby improving the quality and performance of the battery cells.

[0041] In some embodiments, the film transport platform 13 includes a film conveyor belt 131, tension rollers 132, and a vacuum adsorption plate 133. At least two tension rollers 132 are horizontally spaced apart. The film conveyor belt 131 is wrapped around and tensioned on the two tension rollers 132. The film conveyor belt 131 has ventilation holes (not shown in the figure, not indexed) penetrating both sides of its thickness. The vacuum adsorption plate 133 is positioned below the load-bearing transport surface of the film conveyor belt 131 to create negative pressure at the ventilation holes. In this technical solution, by setting the vacuum adsorption plate 133 below the load-bearing transport surface of the film conveyor belt 131 and by providing ventilation holes on the film conveyor belt 131 that communicate with the aforementioned vacuum adsorption plate 133, it is possible to ensure that the film (i.e., the prepared film segment) can be reliably and stably transported.

[0042] In some embodiments, the film transport platform 13 also has a heating structure to heat the film on the film conveyor belt 131, thereby preheating the film during transport, improving the adhesion of the film to the battery cells, and further improving the manufacturing quality of the battery cells. The aforementioned heating structure can be a component independent of the film conveyor belt 131 and the vacuum adsorption plate 133. Alternatively, it can be an integrated component built into the film conveyor belt 131 or the vacuum adsorption plate 133, and can be implemented using commonly used heating structures in the industry, such as heating films or resistance wires.

[0043] In some embodiments, the cross-section of the adhesive film adsorption rotating column 11 is a regular octagon. Using a regular octagonal adhesive film adsorption rotating column 11 can increase the adsorption area of ​​the adhesive film and ensure the reliable and stable position of the adhesive film during the rotation of the adhesive film adsorption rotating column 11. In other words, it reduces the probability of the adhesive film sliding and shifting due to insufficient adsorption force during the rotation. Correspondingly, the aforementioned control disk 112 has seven adsorption ports and one vent port. The adsorption ports and vent port are in fixed positions, so that the adsorption and vent positions on the rotating adsorption plate 111 do not change with the rotation of the control disk. At the same time, the aforementioned rotating adsorption plate 111 is provided with one on each side corresponding to the side of the octagon. Several adsorption slots (not marked in the figure) are opened on the side of the rotating adsorption plate 111 away from the control disk 112. An adsorption air passage (not shown in the figure, not marked) is opened on the side of the rotating adsorption plate 111 facing the control disk 112. The adsorption air passage connects the adsorption port and the adsorption slot, or connects the vent port and the adsorption slot. The eight rotating adsorption plates 111 are connected to each other and driven by the rotation drive motor 134 at the end to rotate around the center of the control disk 112.

[0044] In some embodiments, the film transverse cutting mechanism 12 further includes at least one second cutting blade 122, which is capable of cutting the film on the adsorption surface of the film adsorption rotating column 11 corresponding to its position into at least two segments. It is understood that a cutting groove 1112 is provided on the adsorption surface in the area corresponding to the position of the second cutting blade 122.

[0045] Specifically, the required length of the adhesive film segment varies depending on the type of battery cell. For example, the adhesive film segment length for a two-piece battery cell is approximately twice the length for a four-piece battery cell. To address this objective requirement, this technical solution incorporates a second cutting blade 122 within the adhesive film transverse cutting mechanism 12. This allows for the preparation of adhesive film segments of different lengths based on the type of battery cell, thus meeting diverse production needs. Taking a single second cutting blade 122 as an example, when the battery cell is two-piece, only the first cutting blade 121 needs to be controlled to cut the adhesive film during the preparation of the adhesive film segment on the front side of the battery cell. The second cutting blade 122 does not need to perform its cutting function. However, when the battery cell is four-piece, both the first cutting blade 121 and the second cutting blade 122 are controlled to cut the adhesive film on the adsorption surface during the preparation of the adhesive film segment on the front side of the battery cell, resulting in an adhesive film segment length that is half that of a two-piece battery cell.

[0046] In some embodiments, the number of second cutting blades 122 used in the fabrication of the front-side adhesive film of the battery cell is n, and the number of second cutting blades 122 used in the fabrication of the back-side adhesive film of the battery cell is 3n+2. Specifically, for example, when preparing the front-side adhesive film for two-piece cells, the second cutting blades 122 are not used, i.e., n=0. Then, when preparing the back-side adhesive film for two-piece cells, the number of second cutting blades 122 used is 2. Correspondingly, the back-side adhesive film is formed in three segments. One segment is adhered to the back of the battery cell after the solder strip clamp is removed, while the other two segments are adhered to the back of the battery cell before the solder strip clamp is removed, ensuring reliable connection and positioning of the back-side adhesive film to the solder strip on the back of the battery cell. Of course, the number of the aforementioned second cutting blades 122 can be reasonably adjusted according to actual production needs. To ensure smooth cutting of the adhesive film, corresponding adhesive film holding members 123 can be provided on both sides of the second cutting blade 122. When the second cutting blade 122 cuts the adhesive film, each adhesive film holding member 123 reliably positions the portion of the adhesive film located on both sides of the second cutting blade 122.

[0047] In some embodiments, the film cutting and conveying device further includes a film feeding mechanism 2 and a film longitudinal cutting and slitting mechanism 3. The film feeding mechanism 2 contains a film roll 21. The film strip on the film roll 21 can be introduced into the film longitudinal cutting and slitting mechanism 3 and cut into preset lengths along the width direction of the film roll 21. The film strips, after being cut into preset lengths, are then guided to the adsorption surface of the film adsorption rotating column 11 after being slid back and forth multiple times along the width of the film. The aforementioned film longitudinal cutting and slitting mechanism 3 cuts the film longitudinally, specifically in the direction parallel to the film's transport direction (i.e., the length direction).

[0048] In this technical solution, the film feeding mechanism 2 and the longitudinal cutting and slitting mechanism 3 can improve the automation level of film preparation. At the same time, the longitudinal cutting and slitting mechanism 3 can not only cut the wide film into multiple strands (multiple pieces) of film, but also classify and separate the multiple pieces of film formed by cutting, which can avoid the phenomenon of flipping and sticking of each film during the slitting process.

[0049] In some embodiments, the film feeding mechanism 2 includes a film welding component 22 and a roll detection mechanism 23. The film welding component 22 is located on the film transport path between the film roll 21 and the roll detection mechanism 23, and is used to weld the free ends of two upstream and downstream sections of film. The film welding component includes a receiving plate 221 and a welding plate 222 arranged opposite to each other. An adsorption limiting groove 2211 is formed on the bearing surface of the receiving plate 221. Figure 13 As shown, the adsorption limiting groove 2211 is used to adsorb and limit the upstream and downstream adhesive films, and the material roll detection mechanism 23 is used to detect the remaining amount of adhesive film in the adhesive film roll 21. It can be understood that the aforementioned welding plate 222 has a corresponding heating element so as to realize the heat melting of the two sections of adhesive film and thus achieve the purpose of connecting the upper and lower sections of adhesive film.

[0050] In this technical solution, by constructing an adsorption limiting groove 2211 on the receiving surface of the receiving plate 221 that can limit the upstream and downstream adhesive films, the dimensional accuracy of the two adhesive films after hot-melt connection can be guaranteed, thereby ensuring the smoothness of subsequent adhesive film being pulled and transported.

[0051] As is customary, the aforementioned welding plate 222 is connected to the telescopic end of the welding plate moving drive cylinder 223. By controlling the telescopic movement of the cylinder, the welding plate 222 and the receiving plate 221 are clamped and welded together to achieve the purpose of the adhesive film. Corresponding welding grooves 2212 are also provided at the corresponding positions of the receiving plate 221 and the welding plate 222. During the replacement of the adhesive film roll 21, the operator pulls the free ends of the new (downstream) and old (upstream) adhesive films simultaneously and positions them at the welding groove 2212, and controls the aforementioned cylinder to extend so that the welding plate 222 is close to the receiving plate 221. After pressing, it is heated.

[0052] In one specific embodiment, the roll detection mechanism 23 includes a detection turntable (not labeled in the figure), a first photoelectric sensor (not labeled in the figure), a second photoelectric sensor (not labeled in the figure), and a film detection roller (not labeled in the figure). The detection turntable is rotatably connected to the frame, and the rotation center of the turntable is located at the center of the turntable's length. The film detection roller is fixedly connected to one end of the detection turntable, and the first photoelectric sensor and the second photoelectric sensor are both located on the rotation path at the other end of the detection turntable. In the initial state, the end of the detection plate is located at the first sensor. When the film starts to be transported, the film adheres to the film detection roller, and the film detection roller is subjected to force. The end of the detection plate rotates between the first photoelectric sensor and the second photoelectric sensor. When the film roll is used up, the end of the film in the film roll is subjected to increased force by the film placement roller (i.e., the aforementioned film roll 21) and the film driving structure (used to pull the film out of the film roll, i.e., the traction roller 33) (the film detection roller is located between the film placement roller and the film driving structure along the film transport path). This causes the end of the detection plate to be located at the second photoelectric sensor, realizing the detection of the remaining amount of film in the film roll. At this time, the operator is prompted to replace the film roll 21.

[0053] In some embodiments, the longitudinal cutting and spacing mechanism 3 of the adhesive film is located at the adhesive film output end of the adhesive film feeding mechanism 2. The longitudinal cutting and spacing mechanism 3 of the adhesive film includes a cutting component 31 and multiple spacing components 32 arranged back and forth along the conveying direction of the adhesive film. Each spacing component 32 includes a spacing roller 321 and a corresponding spacing brush 322. The spacing between the adhesive film grooves on the spacing roller 321 is equal to the spacing between the brush rods 3221 of the spacing brush 322. Along the conveying direction of the adhesive film from front to back, the spacing between the adhesive film grooves of each spacing roller 321 and the spacing between the brush rods 3221 of the spacing brush 322 increases sequentially, thereby realizing the step-by-step spacing of the adhesive film and finally making the spacing between two adjacent adhesive films reach the set value, reducing the probability of the adhesive film twisting due to excessive single spacing. In a specific embodiment, four sets of spacing components 32 are provided.

[0054] See details Figure 8 As shown, in some embodiments, the cutting component 31 includes a first cutting roller 311 and a second cutting roller 312. Cutting grooves 313 are formed on the outer roller surfaces of both the first and second cutting rollers 311 and 312. A longitudinal cutting blade 314 is assembled within each cutting groove 313 of the first cutting roller 311, and the blades of the longitudinal cutting blades 314 are correspondingly positioned within each cutting groove 313 of the second cutting roller 312, thereby achieving accurate and efficient cutting of the adhesive film. It is understood that the blades of the longitudinal cutting blades 314 are parallel to the conveying direction of the adhesive film. Figure 8In the specific embodiment shown, two sets of the aforementioned second cutting rollers 312 are provided. The two sets of second cutting rollers 312 are respectively located on both sides of the first cutting roller 311. Each cutting groove 313 of the two sets of second cutting rollers 312 corresponds to each cutting groove 313 of the first cutting roller 311. At the same time, the blade of the longitudinal cutting knife 314 is simultaneously located in the cutting groove 313 of the corresponding second cutting roller 312.

[0055] In some embodiments, the end separation component (not indicated in the figure) is provided adjacent to the film adsorption rotating column 11 in each separation component 32. The film groove of the separation roller 321 in the end separation component is formed by the spaced limiting rings 3211. The adsorption surface is formed on the outer side of the rotating adsorption plate 111. The adsorption surface is formed with limiting grooves 1111 corresponding to the positions of the limiting rings 3211. Each limiting ring 3211 and each limiting groove 1111 are fitted and matched one by one. This can ensure that the position of each film (strip) is accurately corresponding to each adsorption groove on the adsorption surface, thereby ensuring the reliable traction and transportation of the film by the film adsorption rotating column 11.

[0056] See details Figure 4 As shown, the longitudinal cutting and sizing mechanism 3 for the adhesive film also includes a traction roller 33 and multiple sets of guide rollers 34. The main function of the traction roller 33 is to pull the adhesive film out from the adhesive film feeding mechanism 2, while the multiple sets of guide rollers 34 are used to plan and restrict the transport path of the adhesive film.

[0057] The frames of the film feeding mechanism 2 and the film longitudinal cutting and spacing mechanism 3 are independent of each other. There is a correction photoelectric sensor (not marked in the figure) between the film longitudinal cutting and spacing mechanism 3 and the film feeding mechanism 2. The correction photoelectric sensor can independently control the frame position of the film feeding mechanism 2 to achieve overall correction of the film feeding mechanism 2.

[0058] This utility model also provides a battery cell back coating device, including the above-mentioned film cutting and conveying device and a back adhesive film transport device (not shown in the figure). The back adhesive film transport device is used to transfer and adhere the adhesive film on the adhesive film transport platform 13 to the back of the battery cell (not shown in the figure) on the string platform (not shown in the figure).

[0059] In this technical solution, the adhesive film placed on the adhesive film transport platform 13 is transferred and adhered to the back of the solar cell by the back adhesive film handling device. This effectively prevents the stress concentration that occurs when the adhesive film is directly adhered to the surface of the solar cell after the adhesive film section is prepared by the existing rotary adhesive tape mechanism, which can cause damage to the solar cell. This improves the string qualification rate of solar cells and thus improves the quality and performance of the solar cells.

[0060] See details Figure 14As shown, the back film handling device has a first film handling hand 41 and a second film handling hand 42. In a specific embodiment, the first film handling hand 41 and the second film handling hand 42 are assembled on the same displacement driving mechanism (not labeled in the figure). The displacement driving mechanism can drive the first film handling hand 41 and the second film handling hand 42 to move horizontally and vertically between the film transport platform 13 and the battery stringing platform. The first film handling hand 41 is used to handle and adhere the film on the back of the battery cell that does not correspond to the position of the solder strip holder (not shown in the figure). The second film handling hand 42 is used to handle and adhere the film on the back of the battery cell that corresponds to the position of the solder strip holder. It should be noted that the aforementioned solder strip holder is specifically used to be placed on the back of the battery cell on the battery stringing platform to achieve the pressing and positioning of the solder strip on the back of the battery cell, preventing the solder strip from deviating during the film adhesion process, which would lead to a decrease in the stringing quality and battery cell performance.

[0061] In this technical solution, the back film handling device is equipped with a first film handling hand 41 and a second film handling hand 42, which can respectively move and handle the film in the area occupied by the solder ribbon press on the back of the battery cell and the area outside the area. This can significantly improve the efficiency and quality of film adhesion on the back of the battery cell. Since the first film handling hand 41 and the second film handling hand 42 are used to respectively move and handle the film in the area occupied by the solder ribbon press and the area outside the area occupied by the solder ribbon press, the film adhesion is more even and there is no film warping as in the prior art. There is no need to repress the free section of the film, thus effectively preventing the positional deviation of the film and the generation of air bubbles during the repressing process.

[0062] To improve the efficiency of battery string fabrication, under certain conditions, it is necessary to fabricate two battery strings simultaneously. In this case, since the spacing between the cells within the two battery strings is different from the spacing between cells between strings, the spacing of the adhesive film segments formed needs to be reasonably adjusted before adhesion to match the stringing process of fabricating two battery strings simultaneously. In some embodiments, the first adhesive film transporter 41 has four adsorption strips, namely the first adsorption strip 411, the second adsorption strip 412, the third adsorption strip 413, and the fourth adsorption strip 414. The spacing of each adsorption strip in the first adhesive film transporter 41 can be adjusted at least partially along the cell conveying direction of the stringing platform. Thus, by adjusting the spacing between each adsorption strip, the different technical requirements of the spacing between cells within the battery string and the spacing between cells between strings can be met, thereby improving the efficiency of battery stringing.

[0063] See also Figures 15 to 17As shown, in some embodiments, the first adsorption strip 411, the second adsorption strip 412, and the third adsorption strip 413 are connected as a whole by the first connecting plate 415. The first film transporter 41 is also provided with a first longitudinal movement cylinder 416. The fixed end of the first longitudinal movement cylinder 416 is fixedly connected to the fourth adsorption strip 414, and the telescopic end of the first longitudinal movement cylinder 416 is fixedly connected to the third adsorption strip 413. In this way, the first longitudinal movement cylinder 416 can simultaneously drive the first adsorption strip 411, the second adsorption strip 412, and the third adsorption strip 413 to move synchronously, thereby adjusting the distance between the third adsorption strip 413 and the fourth adsorption strip 414 and realizing adaptive compensation for the distance between the two battery strings.

[0064] In some embodiments, the first adhesive film transporter 41 is also provided with a second longitudinal cylinder 417, which is used to drive the fourth adsorption strip 414 to move horizontally, that is, to achieve synchronous adjustment of the positions of the four adsorption strips.

[0065] It is understood that the first film transporter 41 specifically includes a first frame 418, and the aforementioned four adsorption strips are all assembled on the first frame 418. In another preferred embodiment, the two ends of the aforementioned four adsorption strips are slidably connected to the first frame 418 through the first sliding guide post 419, so as to ensure that the position adjustment of each adsorption strip is stable and reliable.

[0066] See details Figure 18 and Figure 19 As shown, the second film transporter 42 has two adsorption strips, namely the fifth adsorption strip 421 and the sixth adsorption strip 422, so that it can simultaneously transport the back film of two battery cells, improving the preparation efficiency. The second film transporter 42 is provided with a third longitudinal cylinder 423, which is used to drive the fifth adsorption strip 421 and the sixth adsorption strip 422 to move synchronously. Specifically, the fifth adsorption strip 421 and the sixth adsorption strip 422 are fixedly connected as one unit by the second connecting plate 424, thereby realizing the synchronous position adjustment of the two adsorption plates by the third longitudinal cylinder 423. In a preferred embodiment, the second film transporter 42 includes a second frame 425, and the fifth adsorption strip 421 and the sixth adsorption strip 422 are connected to the second frame 425 by the second sliding guide post 426.

[0067] It is understandable that each of the aforementioned adsorption strips has multiple negative pressure holes, which are controllably connected to a negative pressure source to achieve negative pressure adsorption of the adhesive film.

[0068] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0069] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for coating the back of a battery cell, characterized in that, The device includes a film cutting and conveying device and a back adhesive film conveying device. The back adhesive film conveying device is used to transfer and adhere the adhesive film on the adhesive film conveying platform (13) to the back of the battery cells on the string platform. The film cutting and conveying device includes an adhesive film adsorption turntable, an adhesive film transverse cutting mechanism (12), and an adhesive film conveying platform (13). The adhesive film adsorption turntable has an adhesive film adsorption rotating column (11) with a polygonal cross-section. The adhesive film transverse cutting mechanism (12) has a first cutting blade (121). The first cutting blade (121) can cut the adhesive film adsorption rotating column (11) into... The adhesive film corresponding to the gap position between two adjacent adsorption surfaces is cut off. The adhesive film transport platform (13) is located below the adhesive film adsorption rotating column (11) to receive and transport the adhesive film segment released from the adsorption surface on the lower side of the adhesive film adsorption rotating column (11). The back adhesive film transport device has a first adhesive film transporter (41) and a second adhesive film transporter (42). The first adhesive film transporter (41) is used to transport and adhere the adhesive film on the back of the battery cell that does not correspond to the position of the solder strip press. The second adhesive film transporter (42) is used to transport and adhere the adhesive film on the back of the battery cell that corresponds to the position of the solder strip press.

2. The battery cell back-side coating device according to claim 1, characterized in that, The first film transporter (41) has four adsorption strips, namely the first adsorption strip (411), the second adsorption strip (412), the third adsorption strip (413) and the fourth adsorption strip (414), and the spacing between the adsorption strips in the first film transporter (41) can be adjusted at least partially along the battery cell transport direction of the string platform; and / or, the second film transporter (42) has two adsorption strips, namely the fifth adsorption strip (421) and the sixth adsorption strip (422).

3. The battery cell back-side coating device according to claim 2, characterized in that, The second adhesive film transporter (42) is equipped with a third longitudinal cylinder (423), which is used to drive the fifth adsorption strip (421) and the sixth adsorption strip (422) to move synchronously.

4. The battery cell back-side coating device according to claim 3, characterized in that, The first adsorption strip (411), the second adsorption strip (412) and the third adsorption strip (413) are connected as one unit by the first connecting plate (415). The first film transporter (41) is also provided with a first longitudinal cylinder (416). The fixed end of the first longitudinal cylinder (416) is fixedly connected to the fourth adsorption strip (414), and the telescopic end of the first longitudinal cylinder (416) is fixedly connected to the third adsorption strip (413).

5. The battery cell back-side coating apparatus according to claim 4, characterized in that, The first film transporter (41) is also provided with a second longitudinal cylinder (417), which is used to drive the fourth adsorption strip (414) to move horizontally.

6. The battery cell back-side coating apparatus according to claim 1, characterized in that, The film transport platform (13) includes a film conveyor belt (131), tension rollers (132), and a vacuum adsorption plate (133). There are at least two tension rollers (132), which are horizontally spaced apart. The film conveyor belt (131) is wrapped around and tensioned on the two tension rollers (132). The film conveyor belt (131) has ventilation holes that penetrate through both sides of its thickness. The vacuum adsorption plate (133) is located below the bearing and conveying surface of the film conveyor belt (131) to form a negative pressure at the ventilation holes.

7. The battery cell back-side coating apparatus according to claim 6, characterized in that, The film transport platform (13) also has a heating structure to heat the film on the film conveyor belt (131).

8. The battery cell back-side coating apparatus according to claim 1, characterized in that, The film transverse cutting mechanism (12) further includes at least one second cutting blade (122). At least one second cutting blade (122) can cut the film on the adsorption surface of the film adsorption rotating column (11) corresponding to its position into at least two segments. The number of second cutting blades (122) used when making the front film of the battery cell is n, and the number of second cutting blades (122) used when making the back film of the battery cell is 3n+2.

9. The battery cell back-side coating apparatus according to claim 1, characterized in that, The film cutting and conveying device further includes a film feeding mechanism (2) and a film longitudinal cutting and splitting mechanism (3). The film feeding mechanism (2) is provided with a film roll (21). The film strip on the film roll (21) can be introduced into the film longitudinal cutting and splitting mechanism (3) and cut into preset roots along the width direction of the film roll (21). The film cut into preset roots is then guided to the adsorption surface of the film adsorption rotating column (11) after being split back and forth multiple times along the width of the film.

10. The battery cell back-side coating apparatus according to claim 9, characterized in that, The film feeding mechanism (2) is provided with a film welding component (22) and a roll detection mechanism (23). The film welding component (22) is located on the film transport path between the film roll (21) and the roll detection mechanism (23) and is used to weld the free ends of the two upstream and downstream sections of film. The film welding component includes a receiving plate (221) and a welding plate (222) arranged opposite to each other. An adsorption limiting groove (2211) is formed on the bearing surface of the receiving plate (221). The adsorption limiting groove (2211) is used to adsorb and limit the upstream and downstream film. The roll detection mechanism (23) is used to detect the remaining amount of film in the film roll (21).

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