Preparation method of photovoltaic module with hidden bus bar

Abstract

The invention provides a preparation method of a photovoltaic module with a hidden bus bar. The preparation method comprises the following steps: S1, arranging battery pieces on a module substrate according to a module model; s2, arranging a first welding strip on the battery piece according to the module model; s3, arranging a bus bar and a second welding strip which are fixedly connected on the battery piece according to the module model; s4, covering the assembly substrate with a flexible film, vacuumizing the covering area of the flexible film to enable the flexible film to tightly press the welding strip and the battery piece, and enabling laser to penetrate through the flexible film to weld the welding strip and the battery piece; the first welding strip is a welding strip which is not directly connected and welded with the bus bar, and the second welding strip is a welding strip which is directly connected and welded with the bus bar; wherein before or at the same time of the step S3, the step of arranging an insulating strip at the to-be-arranged position of the bus bar is further included, and the insulating strip covers the first welding strip at the to-be-arranged position of the bus bar. According to the method, the front light receiving area of the photovoltaic module can be increased, so that the module power is improved, the technological process is simplified, deformation of the bus bar in the welding process can be avoided, and subfissure of the battery piece caused by deformation is avoided.

Description

Technical Field

[0001] The present application relates to a method for preparing a photovoltaic module with hidden busbars, belonging to the technical field of photovoltaic modules. Background Art

[0002] In the prior art, a plurality of back-contact cells are formed into a photovoltaic module through steps such as string welding or full-panel welding, lamination, and packaging. The photovoltaic module includes a plurality of cell strings, and two cell strings are connected by a bus bar. The bus bar of the prior art is set in the gap area between two rows of cells, or in the gap area on one side of a row of cells, see Figure 1 Schematic diagram of a photovoltaic module in the prior art. Due to the existence of the gap area, the busbars can also be seen from the front of the photovoltaic module, which affects the appearance; moreover, the existence of the gap area also occupies the space of the photovoltaic module and squeezes the area of ​​the battery cell. Summary of the invention

[0003] The present invention aims to solve at least one of the problems of the prior art and provides a method for preparing a photovoltaic module with hidden busbars.

[0004] A method for preparing a photovoltaic module with hidden busbars, the method steps comprising:

[0005] S1. Arrange the cells on the component substrate according to the component layout;

[0006] S2. Arrange the first welding strip on the battery cell according to the component layout;

[0007] S3. Arrange the fixedly connected bus bars and second welding strips on the battery cells according to the module layout;

[0008] S4. Covering the module substrate with a flexible film, evacuating the area covered by the flexible film so that the flexible film presses the welding ribbon and the battery cell, and welding the welding ribbon and the battery cell with a laser through the flexible film;

[0009] The first welding strip is a welding strip that is not directly connected and welded to the bus bar, and the second welding strip is a welding strip that is directly connected and welded to the bus bar;

[0010] Among them, before or at the same time as S3. arranging the fixedly connected bus bar and the second welding strip on the battery cell according to the component layout, it also includes the step of setting an insulating strip at the position where the bus bar is to be arranged, wherein the insulating strip covers the first welding strip at the position where the bus bar is to be arranged.

[0011] In some embodiments, a method for preparing a photovoltaic module with hidden bus bars includes the step of prefabricating the fixedly connected bus bars and second welding strips before arranging the fixedly connected bus bars and second welding strips on the battery cells according to the module layout in S3. The steps include preparing the bus bars and the second welding strips, placing a plurality of second welding strips extending along the width direction of the bus bars at intervals along the extension direction of the bus bars, and welding the second welding strips to the bus bars.

[0012] In some embodiments, a method for preparing a photovoltaic module with hidden bus bars is provided, wherein the bus bars include three groups, which are respectively arranged on both sides and in the middle of the photovoltaic module, namely an edge bus bar and a middle bus bar, the middle bus bar connects two battery strings in parallel, and the edge bus bar connects two battery strings in series.

[0013] In some embodiments of a method for preparing a photovoltaic module with hidden bus bars, the edge bus bars are arranged between two adjacent rows of battery cells at the edges, and the middle bus bars are arranged between two adjacent rows of battery cells in the middle.

[0014] In some embodiments, a method for preparing a photovoltaic module with hidden bus bars is provided, wherein the edge bus bars are arranged on a row of cells at the edge, and the middle bus bars are arranged on a row of cells in the middle, wherein the bus bars are arranged to avoid PAD points of the cells.

[0015] In some embodiments of a method for preparing a photovoltaic module with hidden busbars, a second welding ribbon is disposed under the busbar.

[0016] In some embodiments of a method for preparing a photovoltaic module with hidden bus bars, the insulating strips are intermittently arranged insulating strips that cover corresponding positions of the first welding strips covered by the bus bars.

[0017] In some embodiments of a method for preparing a photovoltaic module with hidden busbars, the insulating strip is a continuous insulating strip, and its width is slightly greater than that of the busbar.

[0018] In some embodiments, a method for preparing a photovoltaic module with hidden bus bars is provided, wherein the insulating strip comprises an insulating strip body and protrusions protruding along the width direction and spaced apart in the length direction of the insulating strip body, and the protrusions are arranged corresponding to the position of the first welding strip at the position of the bus bar to be arranged covered by the insulating strip.

[0019] In some embodiments of a method for preparing a photovoltaic module with hidden bus bars, the step of setting insulating bars at the position where the bus bars are to be arranged is set in S3. Before arranging the fixedly connected bus bars and the second welding strips on the battery cells according to the module layout, the method is to arrange the insulating bars at the position where the bus bars are to be arranged.

[0020] In some embodiments of a method for preparing a photovoltaic module with a hidden bus bar, the step of setting an insulating strip at the position where the bus bar is to be arranged is set in S3. While arranging the fixedly connected bus bar and the second welding strip on the battery cell according to the module layout, the method is to prefabricate the fixedly connected bus bar and the second welding strip, fix the insulating strip and the fixedly connected bus bar and the second welding strip, and in S3. when arranging the fixedly connected bus bar and the second welding strip on the battery cell according to the module layout, make the insulating strip located between the bus bar and the battery cell.

[0021] In some embodiments, a method for preparing a photovoltaic module with hidden bus bars is provided, wherein the module substrate is photovoltaic glass and a heat-sealing material disposed thereon, and after step S4, the heat-sealing material and photovoltaic glass are placed thereon and laminated to complete the steps of preparing the photovoltaic module with hidden bus bars.

[0022] The method for preparing a photovoltaic module with hidden busbars according to the present invention has the following beneficial effects.

[0023] By adopting the method for preparing a photovoltaic module with hidden busbars of the present invention, the busbars cannot be seen from the front of the photovoltaic module, making the module beautiful.

[0024] By adopting the method for preparing a photovoltaic module with hidden busbars of the present invention, the busbars are hidden on the back of the battery cells, so that more positions can be used to place the battery cells, increasing the light-receiving area of ​​the front side of the photovoltaic module, thereby increasing the module power.

[0025] The method for preparing a photovoltaic module with hidden bus bars of the present invention simplifies the process flow on the one hand, and on the other hand, the bus bars and the second welding strips are prefabricated and then arranged and welded, which can effectively avoid deformation of the bus bars during the welding process and avoid hidden cracks in the battery cells caused by this. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of a photovoltaic module in the prior art;

[0028] Figure 2 A schematic diagram of the structure after S1. arranging the battery cells on the component substrate according to the component format using the method of the present invention;

[0029] Figure 3A schematic diagram of the structure after the method of the present invention is used and the first welding strip is arranged on the battery sheet according to the component format through S2.;

[0030] Figure 4 A schematic diagram of the structure of the fixedly connected bus bar and the second welding strip;

[0031] Figure 5 It is a schematic diagram of the structure after the insulating strips are arranged at the position where the busbars are to be arranged by the method of the present invention;

[0032] Figure 6 It is a structural schematic diagram of an insulating strip;

[0033] Figure 7 and Figure 8 This is a schematic diagram of the structure after the method of the present invention is used and S3. the bus bar and the second welding strip that are fixedly connected are arranged on the battery sheet according to the component format.

[0034] The figure includes: 1-battery cell, 21-first welding strip, 22-second welding strip, 3-bus bar, 31-edge bus bar, 32-middle bus bar, 4-insulating bar. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0037] Secondly, the present application is described in detail with reference to the schematic diagram. When describing the embodiments of the present application in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present application. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0038] In the prior art, the busbars of the prior art are arranged in the gap area between two rows of battery cells, or in the gap area on one side of a row of battery cells, see Figure 1 Schematic diagram of a photovoltaic module in the prior art; due to the existence of the gap area, the busbar can also be seen from the front of the photovoltaic module, affecting the appearance; and the existence of the gap area also occupies the space of the photovoltaic module and squeezes the area of ​​the battery sheet. To this end, the present invention provides a method for preparing a photovoltaic module with hidden busbars, and the specific implementation method of preparing a photovoltaic module with hidden busbars is as follows.

[0039] Example 1

[0040] A method for preparing a photovoltaic module with hidden busbars, the steps comprising:

[0041] S1. Arrange the battery cell 1 on the component substrate according to the component layout;

[0042] S2. Arrange the first welding strip 21 on the battery cell according to the component version;

[0043] S3. Arrange the bus bar 3 and the second welding strip 22 fixedly connected on the battery sheet according to the component version;

[0044] S4. Covering the module substrate with a flexible film, evacuating the area covered by the flexible film so that the flexible film presses the welding ribbon and the battery cell, and welding the welding ribbon and the battery cell with a laser through the flexible film;

[0045] Among them, before S4. arranging the fixedly connected bus bar and the second welding strip on the battery cell according to the component layout, it also includes the step of setting an insulating strip at the position where the bus bar is to be arranged, and the method is to arrange the insulating strip 4 at the position where the bus bar is to be arranged, and the insulating strip 4 is arranged between the bus bar 3 and the battery cell 1, covering the first welding strip 21 at the position where the bus bar is to be arranged on the battery cell 1.

[0046] Wherein, before S3., it also includes the step of prefabricating the fixedly connected busbar and the second welding strip. The step of prefabricating the fixedly connected busbar and the second welding strip includes respectively preparing the busbar 3 and the second welding strip 22, placing a plurality of second welding strips 22 extending along the width direction of the busbar at intervals along the extension direction of the busbar 3, and welding the second welding strip 22 and the busbar 3 to complete the prefabrication of the fixedly connected busbar and the second welding strip. The present invention is not limited to this, and other methods of fixing the busbar and the second welding strip are also acceptable.

[0047] Among them, the step of prefabricating the fixedly connected bus bars and the second welding strips can be performed before the step S3. of arranging the fixedly connected bus bars and the second welding strips on the battery cells according to the component layout, and it can be performed in parallel with the steps before step S3.

[0048] It should be noted that the first welding strip 21 and the second welding strip 22 are not distinguished by their polarity. The first welding strip 21 refers to a welding strip that is not directly connected and welded to the bus bar, and the second welding strip is a welding strip that is directly connected and welded to the bus bar. The first welding strip 21 and the second welding strip 22 may both include a positive electrode welding strip and a negative electrode welding strip.

[0049] See also Figures 2 to 7 , Figure 2 A schematic diagram of the structure after S1. arranging the battery cells on the component substrate according to the component format using the method of the present invention; Figure 3A schematic diagram of the structure after the method of the present invention is used and the first welding strip is arranged on the battery sheet according to the component format through S2.; Figure 4 A schematic diagram of the structure of the fixedly connected bus bar and the second welding strip; Figure 5 It is a schematic diagram of the structure after the insulating strips are arranged at the position where the busbars are to be arranged by the method of the present invention; Figure 6 It is a structural schematic diagram of an insulating strip; Figure 7 and Figure 8 This is a schematic diagram of the structure after the method of the present invention is used and S3. the bus bar and the second welding strip that are fixedly connected are arranged on the battery sheet according to the component format.

[0050] In the prior art, when welding photovoltaic modules, after the battery cells are arranged according to the pattern, the first welding strip and the second welding strip are arranged on the battery cells and the first welding strip and the second welding strip are welded to the battery cells, and then the insulating strips are arranged, and then the bus bars are arranged, and then the bus bars and the second welding strip that have been welded to the battery cells are welded together. However, the method of the present invention is adopted, and the bus bars and the second welding strips are welded together to complete the prefabrication, and after the battery cells are arranged according to the pattern, the first welding strip is arranged, and then the insulating strip is arranged, and then the prefabricated second welding strip is arranged together with the bus bars, and finally, the welding strips and the battery cells are pressed by vacuuming the covering flexible film, and the first welding strip and the second welding strip are welded to the battery cells by laser. The adoption of this method, on the one hand, simplifies the process flow, and on the other hand, after the bus bars and the second welding strips are prefabricated, they are arranged and welded, which can effectively avoid the deformation of the bus bars during the welding process and avoid the resulting hidden cracks of the battery cells.

[0051] The cell described in the present invention is a back-contact solar cell, and the photovoltaic module is a back-contact solar cell photovoltaic module. Those skilled in the art are aware of the ways of connecting the cell with the welding tape of the back-contact solar cell photovoltaic modules of different versions, and the ways of connecting the welding tape with the busbar, and can refer to the prior art for details. Specifically, the back-contact solar cell includes alternating positive and negative grid lines of opposite sex arranged on the back thereof. The positive grid lines are connected by positive welding tapes, and the negative grid lines are connected by negative welding tapes. The grid lines can be arranged on the back of the cell by screen printing or other methods, and the grid lines welded by welding tapes play a role in guiding current. In a string of cell cells (cell cells arranged in columns in the figure), two adjacent cell cells are connected by positive welding tapes, or by negative welding tapes, which can be set according to the version of the photovoltaic module. Multiple groups of cell strings can be arranged in rows and columns and connected by busbars, wherein, Figure 2 The cells are shown arranged in rows and columns.

[0052] Specifically, as an embodiment, the busbar 3 includes three groups, which are respectively arranged on both sides of the photovoltaic module and on a row of cells in the middle (or on two adjacent rows of cells), namely, edge busbars 31 and middle busbars 32. It can be understood by those skilled in the art that the middle busbar 31 connects two cell strings in parallel, and the edge busbar 32 connects two cell strings in series.

[0053] See also Figure 7 and Figure 8 As a photovoltaic module of a half-cell back-contact solar cell, the edge busbars 31 and the middle busbars 32 of the photovoltaic module both include a plurality of busbars arranged in a row direction, which are disconnected in the middle. The disconnected position of the middle busbar 32 is staggered from the disconnected position of the edge busbar 31.

[0054] As an optional implementation, see Figure 7 and Figure 8 , as an optional embodiment, taking six columns of battery cells as an example, from top to bottom, they are the first column to the sixth column. The edge bus bar 31 connects the negative electrode welding strip, positive electrode welding strip, negative electrode welding strip, positive electrode welding strip, negative electrode welding strip and positive electrode welding strip on the first column to the sixth column of battery cells respectively; it is disconnected between the second column and the third column, and between the fourth column and the fifth column. The middle bus bar connects the positive electrode welding strip, negative electrode welding strip, positive electrode welding strip, negative electrode welding strip, positive electrode welding strip and negative electrode welding strip on the first column to the sixth column of battery cells respectively; it is disconnected between the first column and the second column, between the third column and the fourth column, and between the fifth column and the sixth column. The present invention is not limited to Yuci. If the photovoltaic module version is not a symmetrically arranged half-cell configuration, the corresponding way of connecting the battery cells with the welding strip and the way of connecting the bus bar with the welding strip vary with the design of the module circuit.

[0055] See also Figure 7 The edge bus bar 31 is arranged between two rows of cells adjacent to each other, and the middle bus bar 32 is arranged between two rows of cells adjacent to each other. This method is more suitable for 0BB solar cell photovoltaic modules, and can weld the second welding strip to each grid line of the corresponding polarity of the cell to the maximum extent.

[0056] See also Figure 8 For MBB solar cell photovoltaic modules, the edge bus bar 31 can be arranged on a row of cells at the edge, and the middle bus bar 32 can be arranged on a row of cells in the middle. The bus bar is positioned to avoid the PAD points on the cells, and the welding of the second welding strip and each PAD point of the cells can be ensured.

[0057] Among them, the spacing between adjacent battery cells in a row of battery cells can be positive, zero or negative. Different from the prior art, the busbar is arranged above the battery cell, instead of Figure 1in the gap shown.

[0058] The second welding strip 22 may be disposed above or below the bus bar 3. Preferably, it is disposed below the bus bar 3, which is more conducive to its close contact with the battery cell and achieving good welding with the battery cell.

[0059] The insulating strip may be Figure 4 , Figure 7 and Figure 8 The insulating strip is provided intermittently as shown. The corresponding position of the first welding strip 21 covered by the bus bar 3 is covered to prevent the bus bar and the first welding strip from contacting and leaking electricity. It can also be a continuous insulating strip, and its width is slightly larger than the width of the bus bar. As a preferred embodiment, see Figure 5 It includes an insulating strip main body and protrusions protruding along the width direction and spaced apart in the length direction of the insulating strip main body. The protrusions correspond to the corresponding positions of the first welding strip covered by the bus bar, covering it over a larger width, and more effectively avoiding contact between the bus bar and the first welding strip.

[0060] Those skilled in the art will appreciate that, although the present invention uses the description of arranging insulating strips, the insulating strips may be insulating glue, which is arranged by coating, dispensing, etc., or they may be insulating strips, which are arranged by placing them.

[0061] In the present invention, S4. covers the module substrate with a flexible film, evacuates the area covered by the flexible film, and makes the flexible film press the welding strip and the battery sheet tightly, and the laser penetrates the flexible film for welding. Among them, reference can be made to the public text CN118106614A, a welding, production method and product of a photovoltaic cell module. Of course, after the welding of S4. is completed, the step of breaking the vacuum and uncovering the flexible film can also be included.

[0062] By adopting the method for preparing a photovoltaic module with hidden busbars of the present invention, the busbars cannot be seen from the front of the photovoltaic module, making the module beautiful.

[0063] By adopting the method for preparing a photovoltaic module with hidden busbars of the present invention, the busbars are hidden on the back of the battery cells, so that more positions can be used to place the battery cells, increasing the light-receiving area of ​​the front side of the photovoltaic module, thereby increasing the module power.

[0064] The method for preparing a photovoltaic module with hidden bus bars of the present invention simplifies the process flow on the one hand, and on the other hand, the bus bars and the second welding strips are prefabricated and then arranged and welded, which can effectively avoid deformation of the bus bars during the welding process and avoid hidden cracks in the battery cells caused by this.

[0065] Those skilled in the art can understand that the component substrate is usually photovoltaic glass and heat-sealing materials disposed thereon, such as EVA, POE, etc. After completing step S5. of the present invention, the step of placing heat-sealing materials and photovoltaic glass thereon and performing lamination packaging is also included.

[0066] Example 2

[0067] The rest of this embodiment is the same as that of Embodiment 1, except that in S3, while the bus bars and second welding strips are arranged and fixedly connected on the battery cell according to the assembly layout, insulating strips are provided at the positions where the bus bars are to be arranged. Specifically, the insulating strips are first fixed to the prefabricated bus bars and second welding strips that are fixedly connected, and then, when the bus bars and second welding strips are arranged and fixedly connected on the battery cell according to the assembly layout, the insulating strips are located under the bus bars to achieve insulation.

[0068] The insulating strip is a non-conductive tape or insulating film, such as a PET or PI tape with acrylic or silicone, or a PET or PI substrate coated with ethylene-vinyl acetate copolymer or hot melt adhesive on one or both sides. For example, the insulating strip can be fixed on the bus bar by heating it.

[0069] The above is only a preferred implementation of the present application. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

Claims

1. A method for preparing a photovoltaic module with hidden busbars, characterized in that: The preparation method comprises the following steps: S1. Arrange the cells on the component substrate according to the component layout; S2. Arrange the first welding strip on the battery cell according to the component layout; S3. Arrange the fixedly connected bus bars and second welding strips on the battery cells according to the module layout; S4. Covering the module substrate with a flexible film, evacuating the area covered by the flexible film so that the flexible film presses the welding ribbon and the battery cell, and welding the welding ribbon and the battery cell with a laser through the flexible film; The first welding strip is a welding strip that is not directly connected and welded to the bus bar, and the second welding strip is a welding strip that is directly connected and welded to the bus bar; Among them, before or at the same time as S3. arranging the fixedly connected bus bar and the second welding strip on the battery cell according to the component layout, it also includes the step of setting an insulating strip at the position where the bus bar is to be arranged, wherein the insulating strip is set between the bus bar and the battery cell, covering the first welding strip at the position where the bus bar is to be arranged.

2. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: In S3. before arranging the fixedly connected bus bars and second welding strips on the battery cells according to the component layout, the steps include prefabricating the fixedly connected bus bars and second welding strips, the steps include preparing the bus bars and the second welding strips, placing a plurality of second welding strips extending along the width direction of the bus bars at intervals along the extension direction of the bus bars, and welding the second welding strips to the bus bars.

3. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: The busbars include three groups, which are respectively arranged on both sides and in the middle of the photovoltaic module, namely the edge busbar and the middle busbar. The middle busbar connects two battery strings in parallel, and the edge busbar connects two battery strings in series.

4. The method for preparing a photovoltaic module with hidden busbars according to claim 3, characterized in that: The edge bus bar is arranged between two adjacent rows of battery cells at the edge, and the middle bus bar is arranged between two adjacent rows of battery cells in the middle.

5. The method for preparing a photovoltaic module with hidden busbars according to claim 3, characterized in that: The edge bus bars are arranged on a row of battery cells at the edge, and the middle bus bars are arranged on a row of battery cells in the middle, wherein the bus bars are arranged away from the PAD points of the battery cells.

6. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: The second welding strip is arranged below the bus bar.

7. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: The insulating strip is an intermittently arranged insulating strip, which covers the corresponding position of the first welding strip covered by the bus bar.

8. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: The insulating strip is a continuous insulating strip, and its width is slightly greater than that of the bus bar.

9. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: The insulating strip comprises an insulating strip body and protrusions protruding in the width direction and arranged at intervals in the length direction of the insulating strip body. The protrusions are arranged corresponding to the positions of the first welding strips at the positions of the bus bars to be arranged and covered by the insulating strip.

10. The method for preparing a photovoltaic module with hidden busbars according to claim 1, characterized in that: The step of arranging insulating strips at the positions where the bus bars are to be arranged is provided in S3. before arranging the fixedly connected bus bars and the second welding strips on the battery cells according to the assembly format, the method is to arrange the insulating strips at the positions where the bus bars are to be arranged.

11. The method for preparing a photovoltaic module with hidden busbars according to claim 2, characterized in that: The step of setting an insulating strip at the position where the bus bar is to be arranged is set in S3. When the fixedly connected bus bar and the second welding strip are arranged on the battery cell according to the component layout, the method is to prefabricate the fixedly connected bus bar and the second welding strip, fix the insulating strip and the fixedly connected bus bar and the second welding strip, and in S3. when the fixedly connected bus bar and the second welding strip are arranged on the battery cell according to the component layout, the insulating strip is located between the bus bar and the battery cell.

12. A method for preparing a photovoltaic module with hidden busbars according to any one of claims 1 to 11, characterized in that: The component substrate is photovoltaic glass and heat-sealing material disposed thereon. After step S4, the process also includes placing the heat-sealing material and photovoltaic glass thereon and performing lamination packaging to complete the preparation of a photovoltaic component with hidden busbars.

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