Battery string and photovoltaic module thereof

Abstract

The utility model relates to a battery string and a photovoltaic module thereof, and the battery string comprises battery pieces, each battery piece is provided with a plurality of welding strips, and each welding strip stretches across the surface of the battery piece and intersects with a fine grid; a bearing film is arranged on one side, deviating from the surface of the battery piece, of each welding strip at the intersection of the welding strip and the fine grid; the first end of the thin film bonding part is provided with an avoiding opening used for avoiding a welding strip. The second end of the thin film bonding part is placed on the front surface of the previous battery piece, and covers and is bonded above the bearing film on the front surface of the battery piece; and the first end of the thin film bonding part passes through the welding strip, is placed on the back surface of the next battery piece, and covers and is bonded above the bearing film on the back surface of the battery piece. By using the thin film bonding part, the solder strip can be prevented from deviating, bending and inclining and the thin grid line is prevented from being broken after the film is connected in series, the current collection capability and the output power are ensured, the inter-chip solder strip area with large stress is effectively fixed, the packaging adhesive film is prevented from flowing into the space between the bearing film and the battery piece from the edge of the bearing film during lamination, and the reliability of the battery piece is improved. And assembly reliability is improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic module technology, and in particular to a battery string and its photovoltaic module. Background Technology

[0002] Busbarless module technology is a highly efficient module technology. Compared to traditional busbar technology, busbarless cells eliminate PAD points and main busbar lines, retaining only fine busbar lines. Because there are no main busbar lines, this type of busbarless cell can significantly reduce the amount of silver paste used. In addition, it can increase the effective illumination area of ​​the busbarless cell, use more solder ribbons, and reduce the current transmission distance.

[0003] Currently, the mainstream stringing method for busbarless solar cells consists of steps such as lamination, dispensing, and welding. Among these steps, lamination fixes the solder ribbons to the busbarless solar cell to achieve current collection. However, existing lamination methods prevent the carrier film from covering the entire busbarless solar cell. In areas not covered by the carrier film, the solder ribbons are prone to misalignment and bending, leading to breakage of the fine grid lines, reduced current collection capacity, and decreased output power. At the same time, during lamination, the encapsulating film can easily enter between the carrier film and the busbarless solar cell from the edge, thereby reducing the fixing effect of the solder ribbons at the edge and reducing the reliability of the module.

[0004] Therefore, it is necessary to design a battery string and its photovoltaic module to solve the technical problems mentioned above. Utility Model Content

[0005] Based on this, a battery string and its photovoltaic module are provided. By using a thin film adhesive part to bond between the cells of a gridless battery string, the encapsulating film can be prevented from entering between the carrier film and the cells during lamination, thus affecting the fixing effect of the carrier film on the solder ribbon. At the same time, it can also effectively prevent the solder ribbon from shifting, bending, and tilting after film coating and stringing, as well as the breakage of fine grid lines, ensuring current collection capacity and output power. It can also effectively fix the inter-cell solder ribbon area with high stress, improving the reliability of the module.

[0006] To address the above problems, this application provides a battery string comprising: a plurality of gridless battery cells, each battery cell having two opposing surfaces, each surface having a fine grid; solder ribbons, each battery cell having multiple solder ribbons, each solder ribbon crossing the surface of the battery cell and intersecting the fine grid; a carrier film, each solder ribbon having the carrier film on the side away from the surface of the battery cell at its intersection with the fine grid; and a thin film bonding portion disposed between two adjacent battery cells; wherein the thin film bonding portion has opposing first and second ends, the first end of the thin film bonding portion having a clearance opening for avoiding the solder ribbons; the second end of the thin film bonding portion being placed on the front side of the preceding battery cell, covering and bonding to the carrier film on the front side of the battery cell; and the first end of the thin film bonding portion passing through the solder ribbons and being placed on the back side of the following battery cell, covering and bonding to the carrier film on the back side of the battery cell.

[0007] Preferably, the two ends of the battery string are respectively provided with the film bonding portion; the first end of the film bonding portion passes through the welding ribbon and is bonded to the carrier film on one side of the battery cell, and the second end is folded over and bonded to the carrier film on the other side of the battery cell.

[0008] Preferably, the clearance opening is configured as a serrated and hollowed-out opening, and the number of clearance openings is consistent with the number of welding strips; the two sides of the clearance opening are arranged parallel to each other.

[0009] Preferably, the width of the clearance is set to 0.3-1mm and the length is set to 3-5mm.

[0010] Preferably, the clearance opening is a non-perforated opening, and the number of clearance openings is consistent with the number of solder strips; the clearance opening includes a strip-shaped area for the solder strip to pass through and a circular hole area communicating with the strip-shaped area, the circular hole area being used to accommodate the solder strip.

[0011] Preferably, the width of the strip area is set to 0.1-0.3 mm and the length is set to 3-5 mm.

[0012] Preferably, the film bonding part is made of PET material with a melting point of 250-255°C;

[0013] And / or, the thickness of the film adhesive portion is set to 90-110 μm, and the width is set to 8-12 mm.

[0014] Preferably, the carrier film is made of thermoplastic or thermosetting material.

[0015] Preferably, the welding strip is a low-temperature welding strip, and the melting point of the low-temperature welding strip is set to 140-150℃.

[0016] This application embodiment also provides a photovoltaic module, which, from top to bottom, includes a front panel material, a front encapsulation material, the aforementioned battery string, a rear encapsulation material, and a back sheet material.

[0017] Beneficial effects:

[0018] The aforementioned battery string and its photovoltaic module involve placing the second end of the thin-film adhesive portion on the front side of the preceding battery cell, covering and bonding it to the carrier film on the front side of the cell; and placing the first end of the thin-film adhesive portion, after passing through the solder ribbon, on the back side of the following battery cell, covering and bonding it to the carrier film on the back side of the cell. Because the first end has a clearance opening for avoiding the solder ribbon, the thin-film adhesive portion can be placed between the cells in a gridless battery string. The use of this thin-film adhesive portion effectively prevents the solder ribbon from shifting, bending, or tilting after lamination and stringing, as well as the breakage of fine grid lines, ensuring current collection capacity and output power. It also effectively fixes the inter-cell solder ribbon area with high stress, improving module reliability; and prevents the encapsulating film from flowing from the edge of the carrier film into the space between the carrier film and the gridless battery cell during lamination, further improving module reliability. Attached Figure Description

[0019] Figure 1 This is a top view of a battery string using the existing coating method.

[0020] Figure 2 This is a side view of a battery string with an existing coating method.

[0021] Figure 3 Diagram showing the offset / bending of the start and end points and inter-cell solder strips in existing coated battery strings;

[0022] Figure 4 This is a side view of the battery string in this embodiment;

[0023] Figure 5 This is a partial top view of the battery string in this embodiment;

[0024] Figure 6 for Figure 5 Enlarged view of section A (left side is the back of the gridless solar cell, right side is the front of the gridless solar cell);

[0025] Figure 7 This is a schematic diagram of the film bonding portion in this embodiment. Figure 1 ;

[0026] Figure 8 This is a schematic diagram of the film bonding portion in this embodiment. Figure 2 ;

[0027] Figure 9 This is a schematic diagram of the photovoltaic module in this embodiment.

[0028] Reference numerals: 1. Battery cell; 11. Grid; 2. Welding ribbon; 3. Carrier film; 4. Film bonding part; 41. Clearance opening; 411. Strip area; 412. Circular hole area; 5. Front panel material; 6. Front encapsulation material; 7. Battery string; 8. Back panel encapsulation material; 9. Backplate material. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0032] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] Currently, the mainstream string connection method for gridless solar cells consists of processes such as coating, dispensing, and welding. The coating process fixes the solder ribbon to the gridless solar cell to collect current. However, this method is prone to solder ribbon misalignment and bending, leading to breakage of the fine grid lines, reduced current collection capacity, and decreased output power. Figure 1 , Figure 2As shown, the carrier film 3 in the existing coating method cannot cover the entire gridless solar cell 1. During series connection, in order to avoid the pull handle of the solder ribbon, there needs to be a gap between the two fixtures 101. Therefore, the width of the fixture 101 is narrower than that of the gridless solar cell 1. The carrier film 3 needs the fixture 101 to block the light and press it down to adhere to the gridless solar cell 1 and perform heat coating. Therefore, the width of the carrier film 3 can only be approximately the same as the width of the fixture 101. The coating effect cannot be achieved in the areas where the fixture 101 is not pressed down, and the solder ribbon is prone to displacement (e.g., Figure 3 (As shown). Therefore, currently, after the carrier film 3 is coated, it cannot be laminated to the entire gridless cell 1. During lamination, the encapsulating film easily enters from the edge of the carrier film 3 between the carrier film 3 and the gridless cell 1, thereby reducing the fixing effect of the solder strip at the edge and consequently reducing the reliability of the module.

[0034] This application provides a battery string and its photovoltaic module. By using a thin-film adhesive portion disposed between the cells of a gridless battery string, the front and back carrier films can be bonded through this thin-film adhesive portion. This prevents the adhesive film from entering between the carrier film and the gridless battery cells during lamination, which would affect the fixing effect of the carrier film on the solder ribbon. At the same time, it can also fix the solder ribbon, preventing the solder ribbon from shifting or bending, which could lead to grid breakage and affect current transmission. It can also enhance the reliability of the module, preventing the solder ribbon between cells from shifting due to stress generated during reliability testing, which would reduce the electrical connection effect and affect reliability.

[0035] The following detailed description of a battery string provided in this embodiment, with reference to the accompanying drawings, is provided in detail. Figures 4-6 As shown, the assembly includes: several gridless solar cells 1, solder ribbons 2, a carrier film 3, and a thin film bonding portion 4. Each solar cell 1 has two opposing surfaces, and each surface has a fine grid 11. Each solar cell 1 has multiple solder ribbons 2, and each solder ribbon 2 crosses the surface of the solar cell 1 and intersects with the fine grid 11. Each solder ribbon 2 has the carrier film 3 on the side away from the surface of the solar cell 1 at its intersection with the fine grid 11, and the carrier film 3 is bonded to the solar cell 1 by heating. The thin film bonding portion 4 is disposed between two adjacent solar cells 1, wherein the thin film bonding portion 4 has opposing first and second ends. The first end of the thin film bonding portion 4 has a clearance opening 41 for avoiding the solder ribbons 2. The second end of the thin film bonding portion 4 is placed on the front side of the previous solar cell 1, covering and bonding it to the carrier film 3 on the front side of the solar cell 1. The first end of the thin film bonding portion 4 passes through the solder ribbons 2 and is placed on the back side of the next solar cell 1, covering and bonding it to the carrier film 3 on the back side of the solar cell 1.

[0036] In this embodiment, a thin-film adhesive portion 4 is disposed between two adjacent gridless solar cells 1. The second end of the thin-film adhesive portion 4 is placed on the front side of the first solar cell 1, covering and bonding it to the carrier film 3 on the front side of the solar cell 1. The first end with the clearance opening 41 passes through the solder ribbon 2 and is placed on the back side of the second solar cell 1, covering and bonding it to the carrier film 3 on the back side of the solar cell 1. Thus, by using the thin-film adhesive portion 4, it is possible to effectively prevent the solder ribbon 2 from shifting, bending, and tilting after lamination and the fine grid 11 lines from breaking, ensuring current collection capacity and output power. At the same time, it also effectively fixes the area of ​​the inter-cell solder ribbon 2 with high stress, improves the reliability of the module, and prevents the encapsulating film from flowing from the edge of the carrier film 3 into the space between the carrier film 3 and the gridless solar cell 1 during lamination, further improving the reliability of the module.

[0037] In this embodiment, it should be noted that the thin-film adhesive portion 4 is also provided at both ends of the battery string. The first end of the thin-film adhesive portion 4 passes through the solder ribbon 2 and is pasted onto the carrier film 3 on one side of the battery cell 1, and the second end is folded over and pasted onto the carrier film 3 on the other side of the battery cell 1. Thus, by pasting the thin-film adhesive portion 4 onto both ends of the battery string, the solder ribbon 2 at the ends of the battery string is further prevented from shifting, bending, tilting, or the fine grid lines breaking after the film is coated and connected, thereby improving the reliability of the component.

[0038] Please refer to Figures 4-8 As shown, in this embodiment, it should also be noted that the film bonding part 4 is strip-shaped, and the length of the film bonding part 4 is set to be equal to or slightly longer than the length of the battery cell 1. The width of the film bonding part 4 is set to be greater than the spacing between the battery cells 1. Thus, the film bonding part 4 can ensure that both sides can be bonded to the carrier film 3 of the two adjacent battery cells 1 during use.

[0039] In some embodiments, the clearance opening 41 is configured as a serrated and hollowed-out opening, and the number of clearance openings 41 is consistent with the number of solder ribbons 2. The clearance openings 41 are arranged at equal intervals along the length direction of the film adhesive portion 4. In use, each solder ribbon 2 passes through each corresponding clearance opening 41, thereby making way for the solder ribbon 2 and also limiting the position of the solder ribbon 2. It is understood that the side of the clearance opening 41 that connects to the first end of the film bonding part 4 is an open end, and the other end is a closed end. The shape of the closed end of the clearance opening 41 is not limited, such as it can be a circle, triangle, square, etc. The two sides of the clearance opening 41 are arranged parallel. In other words, the open end of the clearance opening 41 is arranged parallel to the two sides of the closed end. In this arrangement, the width of the clearance opening 41 is set to 0.3-1mm and the length is set to 3-5mm. Of course, the width of the clearance opening 41 is set to be compatible with the solder ribbon 2 so that the solder ribbon 2 can be inserted. Specifically, the width is sufficient to allow the solder ribbon 2 to be inserted. When the film bonding part 4 is placed between two adjacent battery cells 1, the second end of the film bonding part 4 is placed directly on the front side of the previous battery cell 1, covering and bonding it to the carrier film 3 on the front side of the battery cell 1. The first end with a serrated and hollowed-out opening can pass through the solder ribbon 2 and be placed on the back side of the next battery cell 1, covering and bonding it to the carrier film 3 on the back side of the battery cell 1. Thus, by using the serrated and hollowed-out opening, the solder ribbon 2 can be moved aside, making it easier for the first end of the film bonding part 4 to cover and bond to the carrier film 3 on the back side of the battery cell 1. At the same time, the clearance opening 41 can also limit the solder ribbon 2 and prevent the solder ribbon 2 from swaying left and right.

[0040] Of course, in other embodiments, the clearance opening 41 can also be configured as an opening without any perforation. This clearance opening 41 includes a strip-shaped area 411 and a circular hole area 412 communicating with the strip-shaped area 411. The strip-shaped area 411 is used for the welding strip 2 to pass through, and the circular hole area 412 is used to accommodate the welding strip 2 after passing through the strip-shaped area 411. In this configuration, the width of the strip-shaped area 411 is set to 0.1-0.3mm and the length is set to 3-5mm. In this configuration, the width of the strip-shaped area 411 is relatively narrow, so the welding strip 2 is not easy to fall out after passing through. Furthermore, the circular hole area 412 is adapted to the welding strip 2, and the welding strip 2 is not easy to shake when wrapped in the circular hole area 412, which can further fix the welding strip 2.

[0041] In this embodiment, there are no specific restrictions on how to set the structure of the clearance opening 41, as long as it can achieve the clearance and limitation of the welding strip 2.

[0042] In this embodiment, it should also be noted that the film adhesive part 4 needs to have a certain degree of adhesion to form a certain adhesive force with the carrier film 3, and should also have a certain degree of temperature resistance. Therefore, in this embodiment, the film adhesive part 4 is made of a heat-resistant and adhesive material such as PET (polyethylene terephthalate). The melting point of this material is 250-255℃. When the battery string is in operation at high temperature, hot spots will appear. However, the film adhesive part 4 has a high melting point and can withstand high temperature, so it is not easy to melt or be damaged.

[0043] If the thickness of the film adhesive portion 4 is too thin, the adhesion will be weak; if it is too thick, the cost will be high and it will be difficult to install between the battery cells. Therefore, in this embodiment, the thickness of the film adhesive portion 4 is set to be approximately the same as the thickness of the carrier film 3, at 90-110 μm. The width of the film adhesive portion 4 is set to 8-12 mm, which is sufficient to cover the spacing between the battery cells while also being able to adhere to them. The dimensions of the film adhesive portion 4 are designed to be adaptable to the dimensions of the battery cell 1 and the carrier film 3; no specific limitations are imposed in this embodiment.

[0044] In this embodiment, it should also be noted that the carrier film 3 is a thermoplastic or thermosetting material.

[0045] In this embodiment, it should also be noted that the solder ribbon 2 is a low-temperature solder ribbon with a melting point of 140-150°C and a diameter of 0.18-0.3 mm. Since this embodiment involves a gridless solar cell 1, which does not involve welding, and the lamination temperature is above 145°C, a low-temperature solder ribbon with a melting point of 140-150°C is used to melt tin during lamination.

[0046] Please refer to Figure 9 As shown in the figure, this application embodiment also provides a photovoltaic module, which, from top to bottom, includes a front panel material 5, a front encapsulation material 6, the aforementioned cell string 7, a rear encapsulation material 8, and a backsheet material. 9

[0047] The specific steps for manufacturing photovoltaic modules in this embodiment are as follows:

[0048] Step 1: Laser scribing. The gridless solar cell is scribed using a non-destructive laser to form several gridless solar cells 1 that meet certain dimensions, such as 182x91.

[0049] Step 2: Connect the aforementioned gridless solar cells 1 into a string by lamination. Using a machine, place the cut carrier film backing onto the belt, then place the solder ribbon 2 onto the carrier film backing, followed by the gridless solar cells 1, then the solder ribbon 2, and then the cut carrier film fronting. The belt continues to place the solder ribbon 2, carrier film 3, and gridless solar cells 1 in the previous order. Finally, the carrier film 3 is laminated and fixed to the solder ribbon 2 through an infrared light box, thereby connecting the gridless solar cells 1 into a string.

[0050] Step 3: Continue to connect the subsequent battery strings 7 according to the above steps.

[0051] Step 4: Use a machine to cut the film bonding part 4 in this embodiment. The cutting length is equal to or slightly longer than the length of the gridless battery cell 1. Then, use a machine to set the cut film bonding part 4 between the battery cells 1 and at both ends of the gridless battery string 7. For the battery cells 1, place the second end of the film bonding part 4 on the front of the previous battery cell 1, cover and bond it to the carrier film 3 on the front of the battery cell 1. Pass the first end of the film bonding part 4 through the welding ribbon 2 and place it on the back of the next battery cell 1, similarly covering and bonding it to the carrier film 3. For the two ends of the battery string 7, pass the second end of the film bonding part 4 with the clearance 41 through the welding ribbon 2 and stick it to the carrier film 3 on one side of the battery cell 1. Fold the first end of the film bonding part 4 over and stick it to the carrier film 3 on the other side of the battery cell 1. By sequentially setting it between the battery cells 1 and at both ends, the battery string 7 of this embodiment is obtained.

[0052] Step 5: Stack, laminate, frame, cure, and clean the above-mentioned battery strings 7 in sequence to obtain photovoltaic modules.

[0053] The implementation principle of this embodiment is as follows: The film bonding part 4 is pre-set with a serrated and hollowed-out opening or without a hollowed-out opening, and is cut to the length of the gridless battery cell 1 using a film plugging device, and is set between the battery cells and at both ends of the battery string 7.

[0054] For the cells, the first end of the film bonding part 4 is placed on the front of the previous cell 1, covering and bonding it to the carrier film 3, while the second end with the relief opening 41 passes through the welding strip 2 and is placed on the back of the next cell 1, similarly covering and bonding it to the carrier film 3.

[0055] For both ends of the battery string 7, the second end of the thin film adhesive part 4 with the clearance opening 41 is passed through the welding strip 2 and pasted onto the carrier film 3 on one side of the battery cell 1, and the first end of the thin film adhesive part 4 is folded over and pasted onto the carrier film 3 on the other side of the battery cell 1.

[0056] Therefore, by using the thin film adhesive part 4 to be disposed between the cells and at both ends of the gridless cell string 7, the front and back carrier films 3 can be bonded through the thin film adhesive part 4, preventing the adhesive film from entering between the carrier film 3 and the gridless cell 1 during lamination, which would affect the fixing effect of the carrier film 3 on the solder ribbon 2; at the same time, it can also fix the solder ribbon 2, preventing the solder ribbon 2 from shifting or bending, which would lead to grid breakage, affect current transmission, enhance module reliability, and prevent the inter-cell solder ribbon 2 from shifting due to stress generated during reliability testing, which would reduce the electrical connection effect and affect reliability.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery string, characterized in that, include: Several gridless solar cells (1) are provided, each of which has two opposing surfaces, and each surface is provided with fine grids (11). The solder strips (2) are provided on each of the battery cells (1), and each solder strip (2) spans across the surface of the battery cell (1) and intersects with the grid (11); The carrier film (3) is provided on the side of each of the welding strips (2) facing away from the surface of the battery cell (1) at the intersection with the fine grid (11); A thin film bonding portion (4) is disposed between two adjacent battery cells (1); The film bonding part (4) is provided with a first end and a second end opposite to each other, and the first end of the film bonding part (4) is provided with a relief opening (41) for avoiding the solder strip (2). The second end of the film bonding part (4) is placed on the front side of the previous battery cell (1), covering and bonding it to the carrier film (3) on the front side of the battery cell (1). The first end of the film bonding part (4) passes through the welding strip (2) and is placed on the back of the next battery cell (1), covering and bonding it above the carrier film (3) on the back of the battery cell (1).

2. The battery string according to claim 1, characterized in that, The thin film adhesive portion (4) is provided at both ends of the battery string; The first end of the film adhesive part (4) passes through the welding strip (2) and is pasted onto the carrier film (3) on one side of the battery cell (1), and the second end is folded over and pasted onto the carrier film (3) on the other side of the battery cell (1).

3. The battery string according to claim 1 or 2, characterized in that, The clearance opening (41) is configured as a serrated and hollowed-out opening, and the number of clearance openings (41) is consistent with the number of welding strips (2); The two sides of the clearance opening (41) are arranged in parallel.

4. The battery string according to claim 3, characterized in that, The width of the clearance (41) is set to 0.3-1mm and the length is set to 3-5mm.

5. The battery string according to claim 1 or 2, characterized in that, The clearance opening (41) is set as an opening without any perforation, and the number of clearance openings (41) is consistent with the number of welding strips (2); The clearance opening (41) includes a strip-shaped area (411) for the welding strip (2) to pass through and a circular hole area (412) communicating with the strip-shaped area (411), the circular hole area (412) being used to accommodate the welding strip (2).

6. The battery string according to claim 5, characterized in that, The width of the strip region (411) is set to 0.1-0.3 mm and the length is set to 3-5 mm.

7. The battery string according to claim 1, characterized in that, The film bonding part (4) is made of PET material with a melting point of 250-255℃; And / or, The thickness of the film adhesive portion (4) is set to 90-110 μm, and the width is set to 8-12 mm.

8. The battery string according to claim 1, characterized in that, The carrier film (3) is made of thermoplastic or thermosetting material.

9. The battery string according to claim 1, characterized in that, The welding strip (2) is a low-temperature welding strip with a melting point of 140-150℃.

10. A photovoltaic module, characterized in that, From top to bottom, it includes front panel material (5), front encapsulation material (6), battery string (7) as described in any one of claims 1-9, rear encapsulation material (8), and back panel material (9).

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