Photovoltaic carrier film

Abstract

The utility model discloses a photovoltaic bearing film for photovoltaic cell production, which comprises a first film layer and a second film layer, and the second film layer is arranged on the first film layer. The first film layer is a substrate layer, the second film layer is a bearing layer, and the substrate layer is optionally of a single-layer or multi-layer structure; the bearing layer is provided with a fixing part, the bottom of the fixing part is lower than the surface of the bearing layer, and the fixing part is used for containing strip-shaped objects; the number of the fixing parts is multiple, and the multiple fixing parts are parallel to one another. A strip-shaped object such as a welding strip is contained in the groove to be transported and is attached to the surface of the battery pole piece along with the adhesive film, and then the welding strip is welded to the surface of the battery pole piece. By means of the process, it can be ensured that the distance between the welding strips is not changed in the transportation and welding process, the use of a binding agent can be reduced or omitted, the production cost is reduced, meanwhile, the situations of unsoldering and solder skips caused by non-uniform coating of the binding agent can be avoided, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates generally to industrial special films, and in particular to a photovoltaic carrier film for photovoltaic cell production. BACKGROUND

[0002] A photovoltaic cell is a device that converts solar energy into electrical energy. In order to achieve the effect of conduction, metal electrodes for conduction are usually arranged on the front and / or back of the cell. These metal electrodes can be divided into busbars and fingers. The busbars mainly serve to collect the current of the fingers, and the fingers are used to collect photo-generated carriers.

[0003] The busbar has a certain width, which is usually arranged on the front of the cell, and its width will affect the effective area of the cell receiving light energy. Therefore, the 0BB (0-busbar) technology is proposed. The 0BB cell cancels the busbar electrode of the cell and replaces it with a plurality of thinner ribbons, which can be directly interconnected with the fingers to collect the current of the fingers. The use of 0BB technology can make the shading area of the front of the cell smaller and the current transmission distance shorter, thereby reducing power loss and improving power generation efficiency.

[0004] As for the preparation process of the 0BB cell, there are usually three ways to weld the ribbons, including SmartWire, dispensing, and welding dispensing. Among them, the dispensing and welding dispensing processes need to be operated on the ribbons respectively, and the process is complex and the yield is high. In the SmartWire process, the ribbons are first arranged on the photovoltaic adhesive film, and then the photovoltaic adhesive film is attached to the surface of the cell electrode. Using this process, the welding efficiency of the ribbons can be greatly improved, and the yield of the product can be ensured.

[0005] However, in the SmartWire process, the ribbons usually need to be uniformly arranged on the surface of the photovoltaic adhesive film first. In order to improve the connection strength between the two, an adhesive needs to be applied on the surface of the photovoltaic adhesive film to prevent the ribbons from falling off the surface of the photovoltaic adhesive film during transportation or changing the distance between the ribbons to cause uneven distribution.

[0006] This traditional photovoltaic adhesive film for SmartWire, due to the introduction of the adhesive, on the one hand, increases the overall cost, and on the other hand, due to the coating thickness and uniformity of the adhesive, higher requirements are also put forward, otherwise it will result in excessive embedding of the ribbons and virtual welding, affecting the yield of the product.

[0007] In view of the above technical problems, the scheme of the present application is proposed. CONTENT OF THE INVENTION

[0008] In one embodiment, the utility model discloses a photovoltaic bearing film for photovoltaic cell piece production, including first film layer and second film layer, second film layer sets up on first film layer, first film layer is base layer, and second film layer is bearing layer, and the base layer can be selected single layer or multilayer structure, and the bearing layer is provided with fixed part, and the bottom of fixed part is lower than the surface of bearing layer, and fixed part is used to accommodate strip object, and fixed part has a plurality of, and a plurality of fixed parts are parallel to each other.

[0009] Further, the fixed part has an opening, and the maximum horizontal distance of the inner surface of the fixed part is greater than the width of the opening.

[0010] Further, the fixed part has an opening, and the maximum horizontal distance of the inner surface of the fixed part is less than or equal to the width of the opening.

[0011] Further, the cross section of the fixed part is in the shape of a circular arc, the depth of the fixed part is less than the diameter of the circular arc and greater than the radius of the circular arc, or the cross section of the fixed part is in the shape of a partial ellipse, the depth of the fixed part is less than the length of the minor axis of the ellipse and greater than half the length of the minor axis of the ellipse.

[0012] Further, the cross section of the fixed part is in the shape of a circular arc, the depth of the fixed part is less than or equal to the radius of the circular arc.

[0013] Further, the cross section of the fixed part is in the shape of a U, and the equivalent diameter of the circular arc at the bottom of the fixed part is greater than the width of the opening at the upper part of the fixed part.

[0014] Further, the photovoltaic bearing film includes a first film layer and a second film layer, the second film layer is arranged on the first film layer, the first film layer is a base layer, the second film layer is a bearing layer, and the base layer can be selected as a single layer or a multilayer structure; the bearing layer is provided with a fixed part, the surface of the fixed part is higher than the surface of the bearing layer, and the fixed parts are arranged at intervals to form a containing space for containing strip objects.

[0015] Further, the fixed parts are arranged in multiple rows; the multiple rows of fixed parts are parallel to each other, and the multiple rows of fixed parts are respectively parallel to the edges of the photovoltaic bearing film.

[0016] Further, for two adjacent fixed parts, from the root of the fixed part upwards, the spacing between the outer surfaces of the two adjacent fixed parts first decreases and then increases.

[0017] Further, the fixed parts are arranged in multiple rows; the multiple rows of fixed parts are not parallel to the edges of the photovoltaic bearing film.

[0018] The foregoing description of this utility model does not include an exhaustive list of all aspects of the present utility model. It is contemplated that the present utility model encompasses all suitable combinations of the aspects outlined above and those disclosed in the detailed embodiments below and specifically pointed out in the claims filed with this patent application. Such combinations have specific advantages not specifically set forth in the foregoing description. Attached Figure Description

[0019] The embodiments are illustrated in the accompanying drawings by way of example rather than limitation, and similar reference numerals in the drawings indicate similar elements. It should be noted that embodiments referred to as "a" or "an" in this disclosure are not necessarily the same embodiments.

[0020] Figure 1 A schematic cross-sectional view of the photovoltaic carrier film of the first embodiment of this utility model is shown;

[0021] Figure 2 A schematic cross-sectional view of the photovoltaic carrier film of the second embodiment of this utility model is shown;

[0022] Figure 3 A schematic cross-sectional view of the photovoltaic carrier film of the third embodiment of this utility model is shown;

[0023] Figure 4 A schematic cross-sectional view of the photovoltaic carrier film of the fourth embodiment of this utility model is shown;

[0024] Figure 5 A schematic cross-sectional view of the photovoltaic carrier film of the fifth embodiment of this utility model is shown;

[0025] Figure 6 A schematic cross-sectional view of the photovoltaic carrier film of the sixth embodiment of this utility model is shown;

[0026] Figure 7 A schematic cross-sectional view of the photovoltaic carrier film of the seventh embodiment of this utility model is shown;

[0027] Figure 8 A schematic cross-sectional view of the photovoltaic carrier film of the eighth embodiment of this utility model is shown;

[0028] Figure 9 A schematic diagram illustrating an embodiment of the system for producing photovoltaic carrier films according to this utility model is shown.

[0029] Figure 10 A schematic diagram of an embodiment of the angle adjustment mechanism of this utility model is shown. Detailed Implementation

[0030] In this section, we will refer to the drawings to explain several embodiments of the present application. Whenever a component in an embodiment is described as having a particular shape, relative position, or other aspect that is not explicitly defined, the scope of the present application is not limited to only the illustrated component. The illustrated components are for illustrative purposes only. Additionally, although a number of details are set forth, it is understood that some embodiments of the application can be practiced without these details. In other instances, well-known structures and techniques have not been shown in detail in order not to obscure the understanding of this description.

[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Spatially relative terms, such as "under", "below", "lower", "on", "above", "upper", and the like, can be used herein for ease of description to describe one element's or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. The exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0032] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0033] The terms "or" and "and / or" as used herein are to be interpreted as inclusive or meaning any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C." An exception to this definition will occur only when two elements are

[0034] The connection as referred to herein includes various connection modes such as direct connection and indirect connection, and does not require physical contact between the connected parts. For example, various specific connection modes such as snap connection, screw connection, connection without fixing device, welding, riveting, and integral molding are included. In the case of component cooperation, various cooperation relationships such as clearance fit, transition fit, interference fit, or variable clearance are included.

[0035] The photovoltaic carrying film comprises a substrate layer and a carrying layer arranged above the substrate layer, and the materials of the substrate layer and the carrying layer are both selected from polymer materials.

[0036] As an optional embodiment, the material of the substrate layer is selected from one or both of EVA (ethylene-vinyl acetate copolymer) and POE (ethylene-octene copolymer). Optionally, the substrate layer has one layer, and the material thereof is selected from EVA. Alternatively, the substrate layer has one layer, and the material thereof is selected from POE.

[0037] For the above two materials, EVA has polarity, and the electrons thereof can migrate under voltage conditions. The photovoltaic module using the EVA photovoltaic adhesive film will have a PID effect (potential-induced degradation) during power generation, thereby causing a significant decrease in the power generation of the photovoltaic module. The POE material can partially solve the above problem, but the bonding performance of the POE material is weaker than that of the EVA, and the cost of the POE material is relatively high.

[0038] As an embodiment, the substrate layer of the utility model has a two-layer structure, comprising a first layer and a second layer. The first layer is adjacent to the carrying layer, and the second layer is away from the carrying layer. The material of the first layer is selected from POE, and the material of the second layer is selected from EVA. Since the first layer is closer to the battery tab, the use of POE material can reduce the PID effect, improve the power generation efficiency of the photovoltaic cell, and prolong the service life. The use of EVA material in the second layer can improve the bonding performance of the photovoltaic adhesive film and reduce the cost.

[0039] The carrying layer is arranged above the substrate layer, and the material thereof is selected from PO (polyolefin), TPU (polyurethane), TPEE (polyester elastomer), etc. Specifically, the melt index of the material of the carrying layer is 0.1-50 g / 10 min, and optionally, the melt index is 1-15 g / 10 min. The Shore hardness of the carrying layer material is 10-80 D, and optionally, the Shore hardness is 25-70 D. Such materials have low fluidity and certain supportability, and the use of such materials can better achieve the function of carrying the solder strip. At the same time, such materials have certain adhesion, which can improve the connection firmness between the carrying layer and the solder strip.

[0040] As an embodiment, the carrying layer is provided with fixing portions, which are grooves, and a plurality of grooves are provided for accommodating the solder strips. The plurality of grooves are parallel to each other, so as to ensure that there is no interference between the grooves and the solder strips after the solder strips are accommodated into the grooves. The solder strips are transported in the grooves and are attached to the surface of the battery pole piece together with the adhesive film, and then the solder strips are welded to the surface of the battery pole piece. Through such a process, it can be ensured that the spacing between the solder strips does not change during transportation and welding, and the use of adhesive can be reduced or omitted, the production cost is reduced, and the product quality is improved.

[0041] As an optional embodiment, as shown in Figure 1 the cross section of the groove is in the shape of a circular arc. In terms of the cross-sectional shape of the groove, the distance from the uppermost end to the bottom end of the groove is defined as the depth of the groove. In this embodiment, the depth h1 of the groove is less than the diameter D1 of the circular arc and greater than the radius D1 / 2 of the circular arc. It should be noted that the "diameter of the circular arc" in this specification refers to the diameter of the whole circle corresponding to the circular arc. With such a configuration, the cross section of the groove is in the shape of "narrow on the top and wide inside". At this time, when the solder strip is arranged in the groove, the solder strip can be buckled into the groove in a buckling manner, that is, the uppermost end of the groove can exert a clamping force on the solder strip to further stably accommodate the solder strip. At this time, the upper surface of the solder strip is still higher than the carrying surface, and the groove can make the solder strip exposed while limiting the solder strip, so that the solder strip can be smoothly welded to the surface of the battery pole piece.

[0042] As another optional embodiment, as shown in Figure 2 the cross section of the groove is in the shape of a circular arc. In this embodiment, the depth h2 of the groove is less than or equal to the radius D2 / 2 of the circular arc. With such a configuration, the cross section of the groove is in the shape of "wide on the top and narrow on the bottom". Since there is no interference at the upper end of the groove, the solder strip can be arranged in the groove more easily. At this time, the upper surface of the solder strip is exposed from the groove. The groove can make the solder strip exposed while limiting the solder strip, so that the solder strip can be smoothly connected to the surface of the electrode. At the same time, since the depth of the groove is less than or equal to the radius of the circular arc, the solder strip can be conveniently arranged in the groove without exerting additional force to "buckle" the solder strip into the groove. Compared with the previous embodiment, since the exposed part of the solder strip is larger in this embodiment, the welding between the solder strip and the battery pole piece can be more reliable.

[0043] As another optional embodiment, as shown in Figure 3As shown, the groove has a U-shaped cross-section, and the equivalent diameter D3 of the bottom arc of the U-shaped groove is greater than the width w of the upper opening of the U-shaped groove. The "equivalent diameter of the bottom arc" as used in this disclosure refers to the diameter of the circle when the bottom arc is considered as part of a larger circle. The U-shaped groove of this embodiment is easier to manufacture. The equivalent diameter of the bottom arc of the U-shaped groove is greater than the width of the upper opening of the U-shaped groove, meaning that the bottom of the U-shaped groove in this embodiment is relatively flat. With this design, when the solder strip mates with the groove, the solder strip can fit as closely as possible to the bottom of the groove, reducing the air gap between the solder strip and the supporting layer and improving the adhesion effect of the photovoltaic film. At the same time, with this design, the groove can also provide good support and fixation for solder strips with a rectangular cross-section.

[0044] As another alternative implementation method, such as Figure 4 As shown, the cross-section of the groove is a portion of a flat ellipse, with the major axis of the ellipse being substantially parallel to the surface of the bearing layer. The depth of the groove can be greater than, less than, or equal to, the minor axis of the ellipse. This design increases the space at the bottom of the groove, allowing it to fully accommodate excess adhesive generated during cell processing and improving the welding reliability of the solder strip.

[0045] As another alternative implementation method, such as Figures 5 to 8 As shown, protrusions are provided on the surface of the bearing layer. The protrusions have a certain height and their shape can be a cone, a hemisphere, or other shapes (the attached figure only shows a hemisphere or a partial sphere as an example), and this disclosure does not limit the shape. With this arrangement, the welding strip can be clamped between the protrusions, and the gaps between the protrusions serve to fix the welding strip.

[0046] like Figure 5 The diagram illustrates one possible distribution of the protrusions. The protrusions are arranged in multiple rows laterally on the surface of the supporting layer, with a first spacing d1 between adjacent protrusions and a second spacing d2 between rows of protrusions. This arrangement allows the protrusions on the photovoltaic film surface to accommodate solder ribbons in different directions, such as solder ribbons perpendicular to each other or solder ribbons at an angle. The first spacing d1 and the second spacing d2 on the photovoltaic film surface can be customized according to the specific values ​​of the spacing between solder ribbons in different directions on the photovoltaic cell. Figure 5 As shown in this embodiment, for most of the protrusions, the distance between two adjacent protrusions closer to the root is smaller than the distance between their upper parts. With this setting, the solder strip can be conveniently placed between the protrusions without applying additional clamping force.

[0047] like Figure 6 The image shows another way to set the protrusion, compared to... Figure 5 The raised design shown is in Figure 6In the embodiment, the distance between the roots of two adjacent protrusions is greater than the distance between the waists above the roots of the protrusions, in other words, along the height direction of the protrusions, the distance between the outer surfaces of two adjacent protrusions first decreases and then increases from bottom to top. By adopting such an arrangement, a buckle-like positional relationship can be formed between two adjacent protrusions, and a clamping force can be applied to the solder strip arranged between the two adjacent protrusions to prevent displacement of the solder strip, thereby improving the yield of soldering of the solder strip.

[0048] As shown in Figure 7 Another distribution state of the protrusions is shown in the figure, in which the protrusions are arranged in multiple rows on the surface of the carrier layer, and the rows are parallel to each other and form a certain angle with the edges of the carrier film. For the same row, the distance between two adjacent protrusions along the width direction of the carrier film is d1', and the distance along the length direction of the carrier film is d2'. Figure 8 As shown in

[0049] By arranging the above various forms of solder strip fixing portions, the solder strip can be more firmly laid on the surface of the carrier layer, the use of adhesive is reduced, and the mutual interference between the solder strips is prevented. At the same time, the solder strip is laid on the carrier film first, and then the solder strip and the carrier film are laid on the battery pole piece together, which reduces the processing procedures, improves the processing efficiency, and ensures the processing quality.

[0050] As a laying system for laying the solder strip on the surface of the carrier layer, the laying system comprises a shaft roller, and the wound solder strip, photovoltaic carrier film, etc. are arranged on the shaft roller and rotate together with the shaft roller. In the process of rotation, the solder strip and the photovoltaic carrier film are released. As an optional embodiment, the solder strip can also be arranged on the rollers (not shown in the figure), and the rollers are arranged at intervals. The number and interval of the rollers are determined according to the number and interval of the battery pole piece and the solder strip required by the battery pole piece. As an optional embodiment, the rollers are uniformly distributed. As another optional embodiment, the rollers are unevenly distributed.

[0051] The photovoltaic carrier film is wound on the shaft roller in the form of a shaft, and is released by the rotation of the shaft. The shaft roller or roller winding the solder strip rotates together with the shaft roller winding the photovoltaic carrier film, and the linear velocity of the solder strip release is basically consistent with the linear velocity of the carrier film release.

[0052] As shown in Figure 9The shaft roller system 100 for laying the solder ribbon on the surface of the carrier film is shown, including a solder ribbon release roller 101, a carrier film release roller 102, a pressing roller 103, and a winding roller 104. The solder ribbon 1011 is wound on the solder ribbon release roller 101, and is released by the rotation of the solder ribbon release roller 101. The carrier film 1021 is wound on the carrier film release roller 102, and is released by the rotation of the shaft roller. The solder ribbon release roller 101 and the carrier film release roller 102 rotate substantially synchronously, so that the solder ribbon 1011 is laid on the carrier film 1021. Further, the solder ribbon cooperates with the fixed part on the carrier film, so that the solder ribbon is laid in the fixed part on the carrier film. The carrier film with the solder ribbon is passed through the pressing roller 103, which makes the solder ribbon and the carrier film further adhere by pressing and optional heating. In the embodiment, according to the movement sequence of the solder ribbon and the carrier film, the solder ribbon release roller and the carrier film release roller are arranged in the front process of the pressing roller, and the solder ribbon release roller and the carrier film release roller release the solder ribbon and the carrier film respectively, and there is no sequence relationship between the two. In this case, the solder ribbon release roller and the carrier film release roller are located in the "front stage" of the pressing roller, and the solder ribbon release roller and the carrier film release roller belong to the "same stage".

[0053] The winding roller 104 is arranged in the rear stage of the pressing roller 103, and is used for winding the carrier film with the solder ribbon, and can optionally provide a rotating driving force for one or more of the solder ribbon release roller, the carrier film release roller, the pressing roller, and the winding roller. As another optional embodiment, each shaft roller can apply a rotating driving force or apply a driving force through an additional driving roller, which is not limited in the present application.

[0054] In order to more accurately control the distance between the solder ribbons, a guide system can be arranged between the solder ribbon release roller 101 (or the roller) and the photovoltaic carrier film 1021. After the solder ribbon 1011 is released by the shaft roller or the roller, it is guided to the surface of the carrier layer of the photovoltaic carrier film by the guide system. The guide system is arranged in the rear stage of the solder ribbon release roller and the carrier film release roller, and in the front stage of the pressing roller.

[0055] As an optional embodiment, the guide system includes a guide piece. As an optional embodiment, the guide piece is provided with a perforation or a guide groove (not shown) for the solder ribbon to pass through. By adjusting the distance between the perforations or the guide grooves of the guide piece, the distance between the solder ribbons arranged on the photovoltaic carrier film can be controlled, and the control accuracy of the distance between the solder ribbons is improved.

[0056] As another optional embodiment, as shown in FIG. 4, the guide system includes a guide piece 401. The guide piece 401 is arranged in the rear stage of the solder ribbon release roller and the carrier film release roller, and in the front stage of the pressing roller. The guide piece 401 is provided with a guide groove 4011 for the solder ribbon to pass through. The distance between the guide grooves 4011 of the guide piece 401 is adjusted, so that the distance between the solder ribbons arranged on the photovoltaic carrier film can be controlled, and the control accuracy of the distance between the solder ribbons is improved. Figure 9As shown, the guiding system comprises a guiding roller 105. The guiding roller 105 is used to guide the solder tape 1011 released by the solder tape release roller 101 and the carrier film 1021 released by the carrier film release roller 102, and to lay the solder tape on the surface of the carrier film. The horizontal height of the guiding roller 105 is higher than that of the solder tape release roller. With such an arrangement, the solder tape passing through the guiding roller has a downward component, which better enables the solder tape to be laid on the surface of the carrier film. As an optional embodiment, the carrier film 1021 is closer to the surface of the guiding roller 105 than the solder tape 1011, i.e., as shown in FIG. 1B, the solder tape 1011 is laid above the carrier film 1021. Figure 9 As shown, the solder tape 1011 is laid above the carrier film 1021. As another optional embodiment, the solder tape is closer to the surface of the guiding roller than the carrier film (not shown), i.e., the solder tape 1011 is laid below the carrier film 1021.

[0057] Optionally, a groove is arranged on the surface of the guiding roller 105 as a guiding mechanism. The solder tape passes through the groove, which can simultaneously play a guiding and positioning role, and ensure that the spacing between the solder tapes meets the preset.

[0058] The laying system further comprises an angle adjustment mechanism (not shown), as shown in FIG. 1C. Figure 10 As shown, the angle adjustment mechanism is directly or indirectly connected to the rotation shaft of any one or more of the guiding roller, the solder tape release roller, and the carrier film release roller, so that the rotation shaft of the guiding roller, the rotation shaft of the solder tape release roller, and the rotation shaft of the carrier film release roller can be rotated per se, thereby changing the relative angle θ between the rotation shaft of the guiding roller and the rotation shaft of the solder tape release roller and / or the rotation shaft of the carrier film release roller and the initial position.

[0059] In the process of laying the solder tape on the surface of the photovoltaic carrier film, since the carrier film, the solder tape, etc. have a relatively large length, if the alignment angle between the solder tape and the carrier film or the fixed part on the carrier film is slightly offset, the solder tape may be misaligned with the carrier film or the fixed part on the carrier film during the long-distance laying process, resulting in the solder tape being out of the fixed part. In the case that the solder tape is deviated or out of the fixed part, the subsequent photovoltaic carrier film laying and soldering effect will be affected, and thus the yield of the photovoltaic cell will be affected. The angle adjustment mechanism can timely adjust and correct the relative angle between the solder tape and the carrier film. Through such fine adjustment, the quality of the solder tape laying can be ensured.

[0060] As an optional embodiment, the angle adjustment mechanism can be manually adjusted, or can be electronically adjusted by using a servo motor, a stepping motor, or other electronic driving mechanisms. The specific angle adjustment implementation of the present disclosure is not limited.

[0061] In the case of electronic adjustment, the guiding system can further comprise an optical detection system, which identifies the relative angle between the solder strip and the surface fixing part of the carrier film through image recognition or other means. When the solder strip deviates from the carrier film or the solder strip is out of the surface fixing part of the carrier film, the optical detection system sends a correction signal to the angle adjustment mechanism to adjust the relative angle between the solder strip and the carrier film in real time, thereby ensuring the processing precision.

[0062] As shown in Figure 9 the present embodiment, the optical detection system comprises a first camera 201 for photographing the surface of the carrier film on which the solder strip is arranged and obtaining the distance / angle between the solder strip and the edge of the carrier film, so as to determine whether the solder strip is deviated when laid on the carrier film. If it is found that the solder strip is deviated, the optical detection system sends a control signal to the controller of the shaft roller system to adjust the deflection angle of a specific shaft roller in the shaft roller system.

[0063] As an optional embodiment, the optical detection system further comprises a second camera 202 arranged behind the pressing roller 103 and before the winding roller 104, which is used to detect whether the solder strip on the photovoltaic adhesive film after pressing is deviated, so as to ensure that the edge of the photovoltaic adhesive film wound by the winding roller 104 is flat.

[0064] As an embodiment, the roller shaft of the solder strip release roller 101 is provided with an angle adjustment structure, and the adjustment range of the angle θ is 0-10°. When the optical detection mechanism determines that the solder strip is deviated from the carrier film, the deflection angle of the solder strip release roller 101 is adjusted. Since the solder strip release roller 101 is wound with a strip-shaped solder strip, the tension of the solder strip on the solder strip release roller 101 is small, and the solder strip release roller can be deflected by a relatively large angle, so that a large angle deviation can be corrected.

[0065] As another embodiment, the roller shaft of one or more of the carrier film release roller 102, the guiding roller 105 and the winding roller 104 is provided with an angle adjustment structure, and the adjustment range of the angle θ is 0-5°. When the optical detection mechanism determines that the solder strip is deviated from the carrier film, the angle of one or more of the carrier film release roller 102, the guiding roller 105 and the winding roller 104 is adjusted, so as to adjust the positional relationship between the carrier film and the solder strip, and make the end face of the product wound more flat. Since the carrier film release roller 102, the guiding roller 105 and the winding roller 104 are all in contact with the carrier film, and the tension of the carrier film on the carrier film release roller 102, the guiding roller 105 and the winding roller 104 is large, if the adjustment range of the angle θ exceeds the upper limit value, it may cause the product wound finally to have "explosion of muscle" or tearing, etc., affecting the product yield.

[0066] As another optional embodiment, the roll shaft of the solder strip release roller 101 is provided with an angle adjusting structure, and the roll shaft of one or more of the carrier film release roller 102, the guide roller 105 and the winding roller 104 is also provided with an angle adjusting structure.

[0067] The application is not limited to the specific structure and arrangement shown, as long as a similar technical solution is adopted and a similar effect can be achieved, it should be considered to belong to the protection scope of the application. The utility model is not limited to the specific structure and arrangement shown, as long as a similar technical solution is adopted and a similar effect can be achieved, it should be considered to belong to the protection scope of the utility model.

Claims

1.A photovoltaic (PV) carrier film for PV cell production, characterized in that: the PV carrier film comprises a first film layer and a second film layer, the second film layer is arranged on the first film layer; the first film layer is a base layer, and the second film layer is a carrier layer; the base layer is optionally a single layer or a multi-layer structure; the carrier layer is provided with a fixing part, a bottom of the fixing part is lower than a surface of the carrier layer, and the fixing part is used for accommodating a strip-shaped object; and a plurality of fixing parts are arranged in parallel with each other. 2.The PV carrier film according to claim 1, characterized in that: the fixing part has an opening, and a maximum horizontal distance of an inner surface of the fixing part is greater than a width of the opening. 3.The PV carrier film according to claim 1, characterized in that: the fixing part has an opening, and a maximum horizontal distance of an inner surface of the fixing part is less than or equal to a width of the opening. 4.The PV carrier film according to claim 2, characterized in that: a cross section of the fixing part is in a circular arc shape, a depth of the fixing part is less than a diameter of the circular arc and greater than a radius of the circular arc; or a cross section of the fixing part is in a partial elliptical shape, the depth of the fixing part is less than a length of a minor axis of the elliptical shape and greater than a length of a half of the minor axis of the elliptical shape. 5.The PV carrier film according to claim 3, characterized in that: a cross section of the fixing part is in a circular arc shape, and a depth of the fixing part is less than or equal to a radius of the circular arc. 6.The PV carrier film according to claim 3, characterized in that: a cross section of the fixing part is in a U shape, and a diameter of an equivalent circular arc at a bottom of the fixing part is greater than a width of an opening at an upper part of the fixing part. 7.A PV carrier film, characterized in that: the PV carrier film comprises a first film layer and a second film layer, the second film layer is arranged on the first film layer; the first film layer is a base layer, and the second film layer is a carrier layer; the base layer is optionally a single layer or a multi-layer structure; the carrier layer is provided with a fixing part, a surface of the fixing part is higher than a surface of the carrier layer, and the fixing parts are arranged at intervals to form an accommodation space for accommodating a strip-shaped object. 8.The PV carrier film according to claim 7, characterized in that: the fixing parts are arranged in multiple rows; and the multiple rows of fixing parts are arranged in parallel with each other, and the multiple rows of fixing parts are respectively parallel to edges of the PV carrier film. 9.The PV carrier film according to claim 8, characterized in that: for two adjacent fixing parts, from a root of the fixing part to an upper part of the fixing part, a spacing between outer surfaces of the two adjacent fixing parts first decreases and then increases. 10.The PV carrier film according to claim 7, characterized in that: the fixing parts are arranged in multiple rows; and the multiple rows of fixing parts are not parallel to edges of the PV carrier film. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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