Method for producing a bc-type photovoltaic module

Abstract

The application provides a preparation method of a BC battery photovoltaic module, which comprises the following steps: preparing a BC battery string semi-finished product, which comprises first battery pieces and first solder strips which need to be connected with bus bars, second battery pieces and second solder strips which do not need to be connected with bus bars, and the back surface of each battery piece is fixedly connected with a second solder strip, and each second solder strip on the second battery piece is fixedly connected through a common adhesive film; the first battery piece has a connection position corresponding to the bus bar, and at least the second solder strip corresponding to the connection position is subjected to insulation isolation treatment; preparing a bus bar composite; arranging the BC battery string semi-finished product; placing each bus bar composite at each connection position and fixedly connecting the first solder strip in the bus bar composite, then placing a back surface encapsulating adhesive film and a photovoltaic back plate on the BC battery string with the bus bar to form a photovoltaic pre-module, and forming the BC battery photovoltaic module after lamination. The application reduces the preparation cost of the photovoltaic module.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic cell string fabrication technology, and specifically to a method for fabricating BC-type cell photovoltaic modules. Background Technology

[0002] Common photovoltaic modules are made by heat-pressing photovoltaic cell units connected in series and parallel using interconnecting materials (such as solder ribbons and busbars) and encapsulation materials (film, backsheet, glass, frame, junction box, sealant, etc.).

[0003] Film-coated stringing technology is a technique that connects solar cells together to form a cell string using an adhesive film and solder ribbons. In the manufacturing process of BC-type solar photovoltaic modules, the busbar needs to be connected to the solder ribbon of the corresponding polarity in the cell string, and directly insulated from the solder ribbon of the other polarity. In existing technologies, solder ribbons that do not need to be connected to the busbar are covered with an insulating film, while solder ribbons that need to be electrically connected to the busbar are exposed. The busbar is then placed directly on the solar cell to achieve the required electrical connection. However, the cost of the insulating film is higher than that of the film used in conventional film-coated stringing technology (i.e., the non-insulating film that only fixes the solder ribbon to the solar cell, called ordinary film). Therefore, the manufacturing cost of photovoltaic modules in existing technologies is high. Summary of the Invention

[0004] The BC-type solar photovoltaic module manufacturing method designed in this invention can overcome the shortcomings of the existing technology, which uses insulating film to fix the solder strips in the cell stringing process, resulting in high overall manufacturing cost of the photovoltaic module.

[0005] The purpose of this invention is to provide a method for preparing a BC-type solar photovoltaic module, comprising the following steps: S1, a BC type battery string semi-finished product is prepared using a string welding machine. The prepared BC type battery string semi-finished product includes a first type of battery cell that needs to be connected to the busbar, a second type of battery cell that does not need to be connected to the busbar, a first type of welding strip that needs to be directly electrically connected to the busbar, and a second type of welding strip that does not need to be directly electrically connected to the busbar. The back of the first type of battery cell and the second type of battery cell are both fixedly connected with the second type of welding strip, and each second type of welding strip on the back of the second type of battery cell is fixedly connected by ordinary adhesive film. S2, the first type of battery cell has a connection position corresponding to the busbar, and at least the second type of solder strip corresponding to the connection position is insulated and isolated by a first insulating film; S3, Prepare a busbar composite component, the busbar composite component comprising a busbar and a first type of solder strip electrically connected thereto; S4, In the typesetting machine, the photovoltaic front panel and the front sealing film are placed from bottom to top in sequence. The BC type battery string semi-finished product with insulation and isolation treatment is placed on the front sealing film according to the preset typesetting method to complete the typesetting of the BC type battery string semi-finished product. S5, the busbars in each of the prepared busbar composites are placed at the corresponding connection positions, and the first type of welding strips in each of the busbar composites are fixedly connected to the battery cell to form a BC type battery string with busbars. Then, the back sealing film and photovoltaic backsheet are placed on the BC type battery string with busbars from bottom to top to form a photovoltaic pre-module. S6, the photovoltaic pre-module is fed into a laminator for lamination to form a BC-type battery photovoltaic module.

[0006] In some implementations, in step S2, insulation isolation is performed at the connection location in the following manner: The length of the first insulating film is equal to the width of the connection position along the length of the solder strip. The portion of the first type of battery cell other than the connection position of each type of second solder strip is fixedly connected to the battery cell via the ordinary film.

[0007] In some implementations, in step S2, insulation isolation is performed at the connection location in the following manner: All the second type of solder strips on the first type of battery cell are fixedly connected by the first insulating film.

[0008] In some embodiments, the busbars within the busbar composite are connected to the first type of weld strip by welding.

[0009] In some embodiments, the busbars within the busbar composite are connected to the first type of solder strip via adhesive dispensing.

[0010] In some embodiments, the busbars within the busbar composite are connected to the first type of solder strip via a positioning adhesive film.

[0011] In some embodiments, the positioning adhesive film is applied to the side of the busbar facing away from the battery cell, and the positioning adhesive film extends from opposite sides of the busbar in the length extension direction of the solder strip to form an adhesive bond with the back of the battery cell.

[0012] In some embodiments, the positioning adhesive film is a second insulating adhesive film.

[0013] In some embodiments, in step S5, the first type of welding strips in each of the busbar composites are fixedly connected to the back of the battery cell via a third insulating film.

[0014] In some embodiments, in step S5, the first type of welding strips in each of the busbar composites are fixedly connected to the back of the battery cell via a common adhesive film.

[0015] The BC-type photovoltaic module manufacturing method of the present invention, on the one hand, classifies the cells in the cell string according to whether they are connected to the busbars. The solder ribbons on the cells that are not connected to the busbars, i.e., the aforementioned second type of cells, are connected and fixed with ordinary adhesive film, i.e., conventional film coating, instead of using insulating adhesive film to fix the solder ribbons on all cells. This can significantly reduce the manufacturing cost of BC-type photovoltaic modules. On the other hand, the solder ribbons on the aforementioned first type of cells that need to be electrically connected to the busbars are not connected in series in the series connection device, but are formed into composites with the corresponding busbars and then finally connected to the cells in the layout device. This can improve the connection reliability of each solder ribbon and realize the synchronous fixing connection of the busbars, solder ribbons and cells, thereby improving the manufacturing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the steps in the method for preparing a BC-type battery photovoltaic module according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the BC-type battery string semi-finished product prepared in the first embodiment of the present invention. In the figure, the yellow line indicates the first polarity solder strip, the pink line indicates the second polarity solder strip, the black rectangle indicates the ordinary adhesive film, the green rectangle indicates the first insulating adhesive film, and the blue rectangle indicates the battery cell. Figure 3 This is a schematic diagram of the structure of the BC-type battery string semi-finished product prepared in the second embodiment of the present invention. In the figure, the yellow line indicates the first polarity solder strip, the pink line indicates the second polarity solder strip, the black rectangle indicates the ordinary adhesive film, the green rectangle indicates the first insulating adhesive film, and the blue rectangle indicates the battery cell. Figure 4 This is a schematic diagram of the structure of the BC type battery string semi-finished product prepared in the third embodiment of the present invention. In the figure, the yellow line indicates the first polarity solder strip, the pink line indicates the second polarity solder strip, the black rectangle indicates the ordinary adhesive film, the green rectangle indicates the first insulating adhesive film, and the blue rectangle indicates the battery cell. Figure 5 This is a schematic diagram of the structure of the BC-type battery string semi-finished product prepared in the fourth embodiment of the present invention. In the figure, the yellow line indicates the first polarity solder strip, the pink line indicates the second polarity solder strip, the black rectangle indicates the ordinary adhesive film, the green rectangle indicates the first insulating adhesive film, and the blue rectangle indicates the battery cell. Figure 6This is a schematic diagram of the state of each BC type battery string semi-finished product after being arranged in one embodiment of the present invention. The length of each first insulating film in the figure is equal to the width (vertical direction) of the first connection position and the second connection position. Figure 7 This is a schematic diagram of the state after the semi-finished BC type battery strings are arranged in another embodiment of the present invention. The length of each first insulating film in the figure is greater than the width (vertical direction) of the first connection position and the second connection position. The figure shows that the length of the first insulating film covers the full length of the corresponding battery cell (in the stringing direction of the battery string). Figure 8 This is a schematic diagram of the structure of a plurality of first busbar composites or second busbar composites in one embodiment of the present invention; Figure 9 This is a structural schematic diagram of multiple central busbar composite components in one embodiment of the present invention. According to the actual layout requirements, the left and right widths of the central busbars in each central busbar composite component are different. Figure 10 This is a schematic diagram of a structure in which the end busbar and the second polarity solder strip are electrically connected as one unit through the second insulating film in one embodiment of the present invention. The second polarity solder strip in the figure is sandwiched between the end busbar and the second insulating film. Figure 11 This is a schematic diagram of a structure in which the central busbar and the first polar solder strip are electrically connected as one unit through the second insulating film in one embodiment of the present invention. The first polar solder strip in the figure is sandwiched between the central busbar and the second insulating film. Figure 12 This is a schematic diagram of the structure of the second polar welding strip synchronous composite film in the first busbar composite component in another embodiment of the present invention, wherein the film in (a) is a common film and the film in (b) is a third insulating film. Figure 13 This is a schematic diagram of the structure of the first polar welding strip synchronous composite film in the middle busbar composite component in another embodiment of the present invention, wherein the film in (a) is a common film and the film in (b) is a third insulating film. Figure 14 This is a schematic diagram of the structure of each BC type battery string in the layout state in an embodiment of the present invention. In the figure, only the area between each bus bar and the corresponding position of the battery cell uses an insulating film (i.e., the first insulating film), while other parts use ordinary film, which has the lowest cost of film use. Figure 15 and Figure 14 The difference is that, Figure 15 The first insulating film extends to the entire length of the corresponding solar cell, and the cost of using the film is relatively low. Figure 14 The proposed solution is slightly more expensive, but the process cost can be reduced. Figure 16 and Figure 15 The difference is that, Figure 16 The bonding tape for the composite components on the battery cells where the busbars are placed is also secured using an insulating film (i.e., a third insulating film). The cost of using this film is relatively low. Figure 15 The proposed solution is further improved, but the process cost can be reduced. Figure 17 and Figure 16 The difference is that, Figure 17 For fixing the solder strips of the composite component on the other central battery cell where no central busbar is placed, an insulating film (i.e., a third insulating film) is also used. The cost of using this film is relatively low. Figure 16 The solution is further improved, but the photovoltaic module lamination process only requires the preparation of an insulating film (without the need for a simultaneous preparation of a regular film), thus reducing the process cost.

[0017] In the diagram: 10. Semi-finished BC type battery string; 11. First end battery cell; 12. Second end battery cell; 13. Middle battery cell; 101. First polarity solder strip; 102. Second polarity solder strip; 201. Ordinary adhesive film; 202. First insulating adhesive film; 203. Second insulating adhesive film; 204. Third insulating adhesive film; 301. First busbar composite; 3011. End busbar; 302. Second busbar composite; 303. Middle busbar composite; 3031. Middle busbar. Detailed Implementation

[0018] 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, they are provided so that the invention will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed 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.

[0019] 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 invention. However, those skilled in the art will recognize that the invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.

[0020] The following example describes a method for preparing a BC-class photovoltaic module according to the present invention. This example is only a part of the embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. All other embodiments obtained by those skilled in the art without inventive effort should be covered within the scope of protection of the present invention.

[0021] See also Figures 1 to 17 As shown in the embodiment of the present invention, a method for preparing a BC-type solar photovoltaic module is provided, comprising the following steps: S1, a BC-type battery string semi-finished product 10 is prepared using a string welding machine. The prepared BC-type battery string semi-finished product 10 includes a first type of battery cell that needs to be connected to the busbar, a second type of battery cell that does not need to be connected to the busbar, a first type of welding strip that needs to be directly electrically connected to the busbar, and a second type of welding strip that does not need to be directly electrically connected to the busbar. The back of both the first type of battery cell and the second type of battery cell is fixedly connected with a second type of welding strip, and each second type of welding strip on the back of the second type of battery cell is fixedly connected via a common adhesive film 201. Figure 2 In one specific embodiment shown, the first type of battery cell includes a first end battery cell 11 and a second end battery cell 12 located at both ends in the string direction, and two adjacent middle battery cells 13 located in the middle region in the string direction. The remaining battery cells in the same battery string correspond to the second type of battery cell. The aforementioned first type of solder ribbon and second type of solder ribbon may include at least one of a first polarity solder ribbon 101 and a second polarity solder ribbon 102 according to actual connection requirements. Figure 2 In the illustrated embodiment, in the BC-type battery string semi-finished product 10, only a first polarity solder ribbon 101 fixed to the battery sheet is laid on the back of the first end battery sheet 11 and the second end battery sheet 12, and only a second polarity solder ribbon 102 fixed to the battery sheet is laid on the back of each of the middle battery sheets 13. The first polarity solder ribbon 101 and the second polarity solder ribbon 102 on the back of each battery sheet in the second type of battery sheet are respectively fixedly connected to the battery sheet via a common adhesive film 201. For example, if the first polarity solder ribbon 101 is the positive electrode, then the second polarity solder ribbon 102 is the negative electrode. It is understood that, see [reference needed] Figure 2 As shown, on the back of the first end cell 11 and the second end cell 12, only the first polarity solder ribbon 101 is placed, and the second polarity solder ribbon 102 is not placed in this step. On the back of the two middle cells 13, only the second polarity solder ribbon 102 is placed, and the first polarity solder ribbon 101 is not placed in this step. On the back of the remaining cells, according to the stringing requirements of BC type cells, the first polarity solder ribbon 101 and the second polarity solder ribbon 102 are placed and connected at the same time. S2, the first type of battery cell has connection positions corresponding to the busbars. At least for the second type of solder strips corresponding to the connection positions, a first insulating film 202 is used for insulation isolation. Specifically, the aforementioned connection positions vary depending on the placement position of the busbars. For example, the positions of the first polarity solder strips 101 on the first end battery cell 11 and the second end battery cell 12 corresponding to the busbar positions are the first connection positions (e.g., ...). Figure 2 The positions occupied by the green rectangles on the first end battery cell 11 and the second end battery cell 12, respectively, are the second connection positions (e.g., the positions of the second polarity solder strips 102 on the middle battery cell 13 corresponding to the positions of the busbars). Figure 2 (The position occupied by the green rectangle on the central battery cell 13). S3, prepare a busbar composite, the busbar composite including a busbar and a first type of solder strip electrically connected thereto. Specifically, the busbar composite includes a first busbar composite 301, a second busbar composite 302 and a middle busbar composite 303. The first busbar composite 301 and the second busbar composite 302 each include an end busbar 3011 and multiple second polarity solder strips 102 electrically connected to the end busbar 3011. The middle busbar composite 303 includes a middle busbar 3031 and multiple first polarity solder strips 101 electrically connected to the middle busbar 3031. It is understood that the preparation of the aforementioned busbar composites can be carried out simultaneously with the preparation process of the aforementioned BC type battery string semi-finished product 10 to improve the work cycle and thus improve the preparation efficiency of the battery string. S4, In the layout machine, the photovoltaic front panel (not labeled in the figure) and the front sealing film (not labeled in the figure) are placed from bottom to top. The BC type battery string semi-finished product 10 with insulation and isolation treatment is placed on the front sealing film according to the preset layout method to complete the layout of the BC type battery string semi-finished product 10. S5, the busbars in each of the prepared busbar composites are placed at the corresponding connection positions, and the first type of welding strips in each of the busbar composites are fixedly connected to the battery cells to form a BC type battery string with busbars. Specifically, the first busbar composite 301, the second busbar composite 302 and the middle busbar composite 303 are respectively placed at the first connection positions of the first end battery cell 11, the second end battery cell 12 and the second connection position of a middle battery cell 13 of each parallel and spaced BC type battery string semi-finished product 10, and the welding strips in each composite are fixedly connected to the back of the battery cell corresponding to the position to form a BC type battery string with busbars. Then, the back sealing film and photovoltaic backsheet are placed on the BC type battery string with busbars from bottom to top to form a photovoltaic pre-module. S6, the photovoltaic pre-module is fed into a laminator for lamination to form a BC-type battery photovoltaic module.

[0022] In this technical solution, on the one hand, the cells in the battery string are classified according to whether they are connected to the busbars. The solder ribbons on the cells that are not connected to the busbars, i.e., the second type of cells, are connected and fixed with ordinary adhesive film, i.e., conventional film coating, instead of using insulating adhesive film to fix the solder ribbons on all cells. This can significantly reduce the manufacturing cost of BC type photovoltaic modules. On the other hand, the solder ribbons on the first type of cells that need to be electrically connected to the busbars are not connected in series in the stringing equipment, but are formed into composites with the corresponding busbars and then finally connected to the cells in the layout equipment. This can improve the connection reliability of each solder ribbon and achieve synchronous fixing and connection of the busbars, solder ribbons and cells, thereby improving the manufacturing efficiency.

[0023] In some implementations, in step S2, insulation isolation is performed at the connection location in the following manner: The length of the first insulating film 202 is equal to the width of the connection position along the length of the solder strip. The portions of the second-type solder strips on the first type of battery cell, excluding the connection positions, are fixedly connected to the battery cell via the ordinary film 201. Specifically, the length of the first insulating film 202 is equal to the width of the first and second connection positions along the length of the solder strip. The remaining portions of the first polarity solder strips 101 on the first end battery cell 11 and the second end battery cell 12 are fixedly connected to the battery cell via the ordinary film 201. The remaining portions of the second polarity solder strips 102 on the middle battery cell 13 are fixedly connected to the battery cell via the ordinary film 201. See details [link to details]. Figure 2 As shown, the length of each first insulating film 202 is approximately the same as the length of the corresponding busbar in the direction of battery stringing, and is generally slightly larger. That is, for the solder strips on the first end battery cell 11, the second end battery cell 12 and the middle battery cell 13 that do not need to be electrically connected to the busbar, their fixation is achieved by the first insulating film 202 and the ordinary film 201 together, so as to minimize the cost of using the film.

[0024] See Figures 2 to 5 As shown, the positions of the aforementioned first and second connection positions on each battery cell can be reasonably selected according to actual needs, such as at the upper, lower, or middle end of the corresponding battery cell in the illustrated orientation. Specifically, the first busbar composite 301 is located at the end or middle of the first end battery cell 11, the second busbar composite 302 is located at the end or middle of the second end battery cell 12, and the middle busbar composite 303 is located at the end or middle of one of the middle battery cells 13.

[0025] Please see Figures 16 to 17 As shown, in some embodiments, in step S2, insulation isolation treatment is performed at the connection location in the following manner: All the second type of solder strips on the first type of battery cell are fixedly connected by the first insulating film 202. That is, the length of the first insulating film 202 is greater than the width of the first connection position and the second connection position in the length direction of the solder strip, so that the fixing of the corresponding solder strip that does not need to be electrically connected to the busbar on the battery cell is completely achieved by the first insulating film 202, and no longer works together with the ordinary film 201.

[0026] The busbars within each busbar and the first type of solder strip, i.e., the busbars and solder strips within the first busbar composite 301, the second busbar composite 302, and the middle busbar composite 303, are connected by welding, adhesive application, or positioning adhesive film (e.g.) Figure 10 and Figure 11 As shown in the figure, in principle, any method that can achieve a reliable electrical connection between the solder strip and the busbar is acceptable.

[0027] In some implementations, see Figures 12 to 13 When the busbars in the first busbar composite 301, the second busbar composite 302, and the middle busbar composite 303 are connected to the solder strips via a positioning adhesive film, the positioning adhesive film covers and adheres to the side of the busbar facing away from the battery cell, and the positioning adhesive film extends from the opposite sides of the busbar in the length extension direction of the solder strip to form an adhesive bond with the back of the battery cell. Specifically, Figure 10 or Figure 11 With the orientation in the middle as a reference, the positioning adhesive film extends vertically to the upper and lower sides of the busbar or horizontally to the left and right sides of the busbar. In this way, the extended part can form a reliable bond with the back of the battery cell, thereby ensuring the reliable connection between each solder strip and the busbar, as well as the reliability of the position of each busbar and the battery cell.

[0028] In some embodiments, the positioning adhesive film is a second insulating adhesive film 203 to improve the insulation of the busbar location.

[0029] In some embodiments, in step S5, when the welding strips in each composite component are fixedly connected to the back of the battery cell via an adhesive film, the adhesive film is a third insulating adhesive film 204.

[0030] In other embodiments, in step S5, the first type of welding strips in each of the busbar composites are fixedly connected to the back of the battery cell via a common adhesive film 201, so as to further reduce material costs.

[0031] In some embodiments, the preparation of the aforementioned first insulating film 202 and third insulating film 204 is incorporated into the cell string arrangement process of the photovoltaic module. That is, the preparation of all insulating films is not performed within the cell stringing equipment, which greatly simplifies the cell stringing process and makes the photovoltaic module manufacturing flow more rational. Meanwhile, the preparation of the second insulating film 203 can be carried out in parallel with the cell stringing process without affecting the preparation of the insulating film during the arrangement process.

[0032] The aforementioned first insulating film 202, second insulating film 203 and third insulating film 204 can be made of the same material or different materials. Specifically, the aforementioned insulating films can be synthesized using PET + pressure-sensitive material, or PET + thermosetting material, or PET + pressure-sensitive material + thermosetting material, or low-flow polyolefin material with a density of 250 g / cm² or higher.

[0033] The aforementioned ordinary adhesive film 201 can be made of low-flow polyolefin material with a density of more than 50 g / cm² and less than 250 g / cm².

[0034] All of the aforementioned welding strips are low-temperature welding strips. Specifically, the welding temperature range of the low-temperature welding strips is 80℃-200℃.

[0035] 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.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a BC-type solar photovoltaic module, characterized in that, Includes the following steps: S1, a BC type battery string semi-finished product (10) is prepared using a string welding machine. The BC type battery string semi-finished product (10) includes a first type of battery cell that needs to be connected to the busbar, a second type of battery cell that does not need to be connected to the busbar, a first type of welding strip that needs to be directly electrically connected to the busbar, and a second type of welding strip that does not need to be directly electrically connected to the busbar. The back of the first type of battery cell and the second type of battery cell are both fixedly connected with the second type of welding strip, and each second type of welding strip on the back of the second type of battery cell is fixedly connected by a common adhesive film (201). S2, the first type of battery cell has a connection position corresponding to the busbar, and at least the second type of solder strip corresponding to the connection position is insulated and isolated by a first insulating film (202); S3, Prepare a busbar composite component, the busbar composite component comprising a busbar and a first type of solder strip electrically connected thereto; S4, place the photovoltaic front panel and the front sealing film in the layout machine from bottom to top, and place the BC type battery string semi-finished product (10) with insulation and isolation treatment on the front sealing film according to the preset layout method to complete the layout of the BC type battery string semi-finished product (10). S5, the busbars in each of the prepared busbar composites are placed at the corresponding connection positions, and the first type of welding strips in each of the busbar composites are fixedly connected to the battery cell to form a BC type battery string with busbars. Then, the back sealing film and photovoltaic backsheet are placed on the BC type battery string with busbars from bottom to top to form a photovoltaic pre-module. S6, the photovoltaic pre-module is fed into a laminator for lamination to form a BC-type battery photovoltaic module.

2. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, In step S2, insulation isolation is performed at the connection points in the following manner: The length of the first insulating film (202) is equal to the width of the connection position in the direction of the solder strip length. The portion of the first type of battery cell other than the connection position of each second type of solder strip is fixedly connected to the battery cell via the ordinary film (201).

3. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, In step S2, insulation isolation is performed at the connection points in the following manner: All the second type of solder strips on the first type of battery cell are fixedly connected by the first insulating film (202).

4. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, The busbar in the busbar composite is connected to the first type of welding strip by welding.

5. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, The busbar in the busbar composite is connected to the first type of solder strip by dispensing adhesive.

6. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, The busbar in the busbar composite is connected to the first type of solder strip by a positioning adhesive film.

7. The method for preparing a BC-type solar photovoltaic module according to claim 6, characterized in that, The positioning adhesive film is applied to the side of the busbar facing away from the battery cell, and the positioning adhesive film extends from the opposite sides of the busbar in the length extension direction of the solder strip so as to form an adhesive with the back of the battery cell.

8. The method for preparing a BC-type solar photovoltaic module according to claim 7, characterized in that, The positioning adhesive film is the second insulating adhesive film (203).

9. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, In step S5, the first type of welding strip in each of the busbar composite components is fixedly connected to the back of the battery cell via a third insulating film (204).

10. The method for preparing a BC-type solar photovoltaic module according to claim 1, characterized in that, In step S5, the first type of welding strip in each of the busbar composite components is fixedly connected to the back of the battery cell via a common adhesive film (201).

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