Photovoltaic module and preparation method thereof

Abstract

The invention relates to the field of photovoltaic technology, and provides a photovoltaic module and a preparation method thereof, and the photovoltaic module comprises a plurality of solar cells; the plurality of welding strips are used for electrically connecting the adjacent solar cells through the grid lines on the solar cells and comprise first welding strips and second welding strips, and the polarity of the grid lines connected with the first welding strips is opposite to the polarity of the grid lines connected with the second welding strips on the surface of the same solar cell; and the plurality of bus bars are electrically connected to the backlight surface of the solar cell by being welded with the welding strips, and comprise a first bus bar which is used for being electrically connected with the first welding strip and is insulated from the second welding strip, and a second bus bar which is used for being electrically connected with the second welding strip and is insulated from the first welding strip. The bus bars are arranged on the backlight surfaces of the solar cells, the light receiving surfaces on the front surfaces of the solar cells are not shielded, the space between the solar cells is not occupied, the effective light receiving area of the solar cells can be increased, and the photoelectric conversion efficiency of the photovoltaic module is further improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a method for preparing the same. Background Art

[0002] In a photovoltaic module, solar cells are connected in series or in parallel through a specific connection method to form a path for current transmission. Adjacent solar cells are connected by welding ribbons, and bus bars are used to collect the current transmitted by multiple welding ribbons, thereby collecting the current generated by the cells to the output end of the photovoltaic module.

[0003] The welding ribbon is usually connected to the electrode on the surface of the solar cell by welding, and the bus bar is usually directly welded to the welding ribbon between adjacent cells, or the bus bar and the welding ribbon are connected by additional connectors. The above-mentioned additional connectors are usually pre-set when the cell and the welding ribbon are welded, and then after the cell string is formed, the bus bar is welded to these connectors.

[0004] However, the conventional busbar setting method requires occupying a large external space, especially when the busbar is set between adjacent battery cells, which makes it difficult to narrow the spacing between the battery cells, thereby reducing the effective light-receiving area of ​​the photovoltaic module, reducing the overall photoelectric conversion efficiency of the photovoltaic module, and making it difficult to improve the performance of the photovoltaic module.

[0005] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country for those skilled in the art. Summary of the invention

[0006] The main purpose of the present application is to provide a photovoltaic module and a method for preparing the same, so as to solve the problem in the prior art that the performance of the photovoltaic module is difficult to improve due to the arrangement of the busbars.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a photovoltaic module is provided, which includes: a plurality of solar cells; a plurality of welding strips, located on the surface of the solar cells, for electrically connecting adjacent solar cells through grid lines on the solar cells, the plurality of welding strips include a first welding strip and a second welding strip, and on the surface of the same solar cell, the polarity of the grid lines connected by the first welding strip is opposite to the polarity of the grid lines connected by the second welding strip; a plurality of bus bars, the extension direction of the bus bars intersects with the extension direction of the welding strips, and the orthographic projection of the bus bars on the solar cells has an overlapping part with the orthographic projection of the welding strips on the solar cells, the bus bars are electrically connected to the backlight surface of the solar cells by welding with the welding strips, the plurality of bus bars include a first bus bar and a second bus bar, the first bus bar is used to be electrically connected to the first welding strip and insulated from the second welding strip, and the second bus bar is used to be electrically connected to the second welding strip and insulated from the first welding strip.

[0008] In some embodiments of the present application, the photovoltaic assembly further includes: a plurality of first insulating components, the plurality of first insulating components are arranged at intervals, the first insulating components cover a partial area of ​​the welding strip, and the first insulating components are used to fix the welding strip to the surface of the solar cell.

[0009] In some embodiments of the present application, the first insulating component includes solid glue.

[0010] In some embodiments of the present application, the photovoltaic assembly further includes a second insulating component, wherein the second insulating component is located between the first bus bar and the second welding ribbon, and the second insulating component is located between the second bus bar and the first welding ribbon.

[0011] In some embodiments of the present application, the second insulating component includes ethylene-vinyl acetate copolymer or polyethylene terephthalate.

[0012] In some embodiments of the present application, the solar cell is a back-contact solar cell.

[0013] According to another aspect of the present application, a method for preparing a photovoltaic module is provided, the method comprising: fixing a welding strip on the surface of a solar cell using a first insulating component; placing a second insulating component at a set position of the welding strip; placing a bus bar on a side of the welding strip away from the solar cell; welding the bus bar to a position to be connected of the welding strip, so that the bus bar is electrically connected to the solar cell through the welding strip at the position to be connected.

[0014] In some embodiments of the present application, during the process of welding the bus bar and the welding ribbon at the position to be connected, the method for preparing the photovoltaic module further includes: welding the welding ribbon and the solar cell at the position not to be connected between the bus bar and the welding ribbon.

[0015] In some embodiments of the present application, after fixing the welding ribbon on the surface of the solar cell using the first insulating component and before welding the bus bar and the welding ribbon at a position to be connected, the method for preparing the photovoltaic module further includes: welding the welding ribbon and the solar cell at a position where the bus bar and the welding ribbon are not to be connected.

[0016] In some embodiments of the present application, after placing the bus bar on the side of the welding strip facing away from the solar cell sheet and before welding the bus bar and the welding strip to a position to be connected, the method for preparing the photovoltaic module further includes: heating the second insulating component to fix the bus bar and the welding strip to a position not to be connected.

[0017] The technical effects of this application are as follows:

[0018] The photovoltaic module includes: a plurality of solar cells; a plurality of welding strips, which are located on the surface of the solar cells and are used to electrically connect adjacent solar cells through grid lines on the solar cells, the plurality of welding strips include a first welding strip and a second welding strip, and on the surface of the same solar cell, the polarity of the grid lines connected by the first welding strip is opposite to the polarity of the grid lines connected by the second welding strip; a plurality of bus bars, the extension direction of the bus bars intersects with the extension direction of the welding strips, and the orthographic projection of the bus bars on the solar cells overlaps with the orthographic projection of the welding strips on the solar cells, the bus bars are electrically connected to the backlight surface of the solar cells by welding with the welding strips, the plurality of bus bars include a first bus bar and a second bus bar, the first bus bar is used to be electrically connected to the first welding strip and insulated from the second welding strip, and the second bus bar is used to be electrically connected to the second welding strip and insulated from the first welding strip. The bus bar is arranged on the backlight side of the solar cell, without blocking the light-collecting surface of the front side of the solar cell. Moreover, the bus bar does not occupy the space between the cells. The spacing between the cells can be set small enough to increase the effective light-collecting area of ​​the cell, thereby improving the photoelectric conversion efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a photovoltaic module provided according to an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a partial structure of a photovoltaic module provided according to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a partial structure of another photovoltaic module provided according to an embodiment of the present application;

[0023] Figure 4 A schematic diagram of a partial structure of another photovoltaic module provided according to an embodiment of the present application;

[0024] Figure 5 A schematic diagram of a partial structure of another photovoltaic module provided according to an embodiment of the present application;

[0025] Figure 6 The present invention is a flow chart of a method for preparing a photovoltaic module according to an embodiment of the present application.

[0026] The above drawings include the following reference numerals:

[0027] 1. Solar cell; 2. Welding ribbon; 21. First welding ribbon; 22. Second welding ribbon; 3. Bus bar; 31. First bus bar; 32. Second bus bar; 4. First insulating component; 5. Second insulating component; X, first direction; Y, second direction; Q1, first region; Q2, second region; Q3, third region. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when it is described that an element is "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0032] As introduced in the background technology, the bus bar arrangement in the prior art needs to occupy a large external space, which may lead to a reduction in the effective light-receiving area of ​​the photovoltaic module, thereby reducing the overall photoelectric conversion efficiency of the photovoltaic module, and making it difficult to improve the performance of the photovoltaic module. In order to solve the problem that the performance of the photovoltaic module is difficult to improve due to the bus bar arrangement in the prior art, the embodiments of the present application provide a photovoltaic module and a preparation method thereof.

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Figure 1 A schematic diagram of the structure of a photovoltaic module provided according to an embodiment of the present application.

[0035] like Figure 1 As shown, the photovoltaic module includes: a solar cell 1, a welding ribbon 2 and a bus bar 3. The bus bar 3 is arranged on the backlight side of the solar cell 1, and does not block the light-collecting side of the front side of the solar cell 1. In addition, the bus bar 3 does not occupy the space between the cells, and the spacing between the cells can be set small enough, so as to increase the effective light-collecting area of ​​the cell, thereby improving the photoelectric conversion efficiency of the photovoltaic module.

[0036] The connection relationship between the solar cell 1, the welding ribbon 2 and the bus bar 3 is as follows:

[0037] A plurality of solar cells 1 may be arranged in an array along a first direction X and a second direction Y. In each row of solar cells 1 arranged along the first direction X, a plurality of cells are sequentially connected to form a solar cell string. The plurality of solar cell strings are arranged along the second direction Y.

[0038] A soldering ribbon 2 is provided on the surface of the solar cell 1. The soldering ribbon 2 can be used to electrically connect adjacent solar cells 1 through grid lines (not shown in the figure) on the solar cell 1, so as to form the above-mentioned solar cell string. The extension direction of the soldering ribbon 2 can be the same as the arrangement direction of the multiple solar cells 1 in the same solar cell string. For example, the soldering ribbon 2 extends along the first direction X.

[0039] Figure 2 is a schematic diagram of a partial structure of a photovoltaic module provided according to an embodiment of the present application, Figure 2 by Figure 1 Take the first region Q1 in the example to represent Figure 1 The connection relationship between two adjacent solar cells 1.

[0040] According to the different polarities of the grid lines connected by the welding strips 2, the multiple welding strips 2 may include a first welding strip 21 and a second welding strip 22, wherein, on the surface of the same solar cell 1, the polarity of the grid lines connected by the first welding strip 21 is opposite to the polarity of the grid lines connected by the second welding strip 22. For example, the first welding strip 21 may be used to connect the grid lines with positive polarity on a certain set solar cell 1, and at the same time connect the grid lines with negative polarity on the solar cell 1 adjacent to the set solar cell 1, and the second welding strip 22 may be used to connect the grid lines with negative polarity on the set solar cell 1, and at the same time connect the grid lines with positive polarity on the solar cell 1 adjacent to the set solar cell 1, thereby connecting two adjacent solar cells in series. It is understandable that the above-mentioned grid lines with positive polarity may be defined as grid lines for collecting positive carriers, and the above-mentioned grid lines with negative polarity may be defined as grid lines for collecting negative carriers.

[0041] The busbar 3 is located on the surface of the solar cell 1 where the welding strip 2 is located, and the extension direction of the busbar 3 intersects with the extension direction of the welding strip 2. For example, the busbar 3 extends along the second direction Y, and the second direction Y can be perpendicular to the first direction X. The orthographic projection of the busbar 3 on the solar cell 1 and the orthographic projection of the welding strip 2 on the solar cell 1 have an overlapping portion, then at the position where the above-mentioned overlapping portion is located, the busbar 3 and the welding strip 2 overlap, and the busbar 3 can be welded with the welding strip 2 to be electrically connected to the backlight surface of the solar cell 1. Specifically, the overlapping portion of the busbar 3 and the welding strip 2 is welded, and the overlapping portion of the welding strip 2 and the grid line is welded, so as to form an electrical interconnection between the busbar 3, the welding strip 2 and the solar cell 1.

[0042] Figure 3 is a partial structural schematic diagram of another photovoltaic module provided according to an embodiment of the present application, Figure 4 is a partial structural schematic diagram of another photovoltaic module provided according to an embodiment of the present application, Figure 3 and Figure 4 Respectively Figure 1 Taking the second area Q2 and the third area Q3 in FIG. 1 as an example, the connection relationship between the bus bar 3 and the welding ribbon 2 is illustrated.

[0043] In the embodiment of the present application, each bus bar 3 is used to connect multiple welding strips 2, and the same bus bar 3 is connected to multiple welding strips 2 connected to grid lines with the same polarity. Depending on the welding strips 2 connected to the bus bar 3, the multiple bus bars 3 may include a first bus bar 31 and a second bus bar 32, wherein the first bus bar 31 is used to be electrically connected to the first welding strip 21 and insulated from the second welding strip 22, and the second bus bar 32 is used to be electrically connected to the second welding strip 22 and insulated from the first welding strip 21, thereby ensuring that the transmission path of the positive carriers and the transmission path of the negative carriers do not interfere with each other.

[0044] In the embodiment of the present application, the solar cell 1 can be a back contact (BC) solar cell, and the electrodes, grid lines and bus bars 3 of the BC cell are all arranged on the back of the solar cell 1, which greatly reduces the shielding of the incident light by the above components, thereby increasing the amount of light absorbed, which is beneficial to improving the photoelectric conversion efficiency of the photovoltaic module, and the above-mentioned conductive components are arranged on the back of the solar cell 1, which is beneficial to a more refined and personalized design of the arrangement of the above-mentioned conductive components, so that the arrangement of the above-mentioned conductive components can be adjusted according to different product requirements, optimize the collection and transmission of current, reduce internal resistance losses, and improve the performance of photovoltaic modules.

[0045] It is understandable that the number and position of the welding ribbons 2 and the busbars 3 in the photovoltaic module can be designed according to the needs, wherein the number and position of the welding ribbons 2 can be set according to the number and arrangement of the electrodes and grid lines on each solar cell 1, and the number and position of the busbars 3 can be set according to the requirements of the photovoltaic module for the current transmission capacity. The embodiment of the present application does not limit the number and position of the welding ribbons 2 and the busbars 3 in the photovoltaic module. For example, Figure 1 As shown, bus bars 3 can be arranged near the edge positions on both sides of the photovoltaic module and in the middle of the photovoltaic module. This arrangement method can meet the photovoltaic module's demand for current transmission capacity while keeping the number of bus bars 3 as small as possible, which is conducive to reducing the design difficulty and preparation difficulty of the transmission circuit.

[0046] Figure 5It is a schematic diagram of the partial structure of another photovoltaic assembly provided according to an embodiment of the present application.

[0047] like Figure 5 As shown, the photovoltaic assembly may further include a plurality of first insulating components 4 , which are arranged at intervals and cover a portion of the welding ribbon 2 , and may be used to fix the welding ribbon 2 to the surface of the solar cell 1 .

[0048] The first insulating component 4 can be formed of a sticky material including but not limited to solid glue, or a material that can be sticky under changes in temperature, pressure and other conditions. In the area where the first insulating component 4 covers the welding ribbon 2, the first insulating component 4 can adhere the welding ribbon 2 it covers to the surface of the solar cell 1, so that under the pressure applied by the first insulating component 4 to the welding ribbon 2 and the bonding force between the two, the welding ribbon 2 and the solar cell 1 can be more closely combined, thereby avoiding the welding ribbon 2 from moving or deforming in the subsequent process, ensuring the connection quality between the welding ribbon 2 and the solar cell 1 and the structural stability of the photovoltaic module.

[0049] The first insulating component 4 may be, but is not limited to, a dot-shaped, block-shaped or strip-shaped insulating component, and its size is not limited here, and it is only required that the portion covered by the first insulating component 4 avoids the portion where the busbar 3 is to be set. For example, the first insulating component 4 may be arranged in a regular array or irregularly. It can be seen that there is a greater degree of freedom when setting the first insulating component 4, and the requirements for process accuracy are lower, which is conducive to reducing the difficulty of production.

[0050] like Figure 1 , Figure 3 and Figure 4 As shown, the photovoltaic module further includes a second insulating component 5, which is located between the first bus bar 31 and the second welding strip 22, and between the first bus bar 31 and the first welding strip 21. The second insulating component 5 can effectively provide direct electrical contact between the first bus bar 31 and the second welding strip 22, and between the second bus bar 32 and the first welding strip 21, to avoid short circuits, and ensure that the transmission paths of positive carriers and negative carriers do not interfere with each other, thereby ensuring the normal operation of the photovoltaic module.

[0051] In some embodiments of the present application, the second insulating component 5 may include ethylene vinyl acetate copolymer (EVA) or polyethyleneterephthalate (PET). EVA and PET have good adhesion and insulation properties, and can bond the bus bar 3 to the surface of the welding ribbon 2 and the solar cell 1, thereby preventing the bus bar 3 from moving or deforming, and achieving electrical isolation between the bus bar 3 and other conductive components on the surface of the welding ribbon 2 and the solar cell 1, so that the above-mentioned conductive components form the required current transmission path, ensure the normal operation of the photovoltaic module, and improve the reliability of the photovoltaic module. The second insulating component 5 can be an insulating component including but not limited to a block or strip shape, and its size is not limited here.

[0052] Based on the same concept, the embodiment of the present application also provides a method for preparing a photovoltaic module. Figure 6 Flow chart of a method for preparing a photovoltaic module according to an embodiment of the present application. Figure 6 As shown, the photovoltaic module preparation method includes the following steps S1 to S4:

[0053] Step S1, using the first insulating component 4 to fix the welding ribbon 2 on the surface of the solar cell 1. Specifically, step S1 may include the following steps S11 and S12: Step S11, placing the welding ribbon 2 at a set position on the surface of the solar cell 1. Exemplarily, the welding ribbon 2 is located on the surface of the solar cell 1, and the welding ribbon 2 extends along the first direction X. Step S12, setting the first insulating component 4 at the set position of the welding ribbon 2. Exemplarily, glue dots can be set at the set positions of each welding ribbon 2 as the first insulating component 4 by dispensing glue, and the glue dots can be arranged in an array and cover the set positions of each welding ribbon 2. After the glue dots are set at the desired positions, the glue dots can be heated to improve the adhesion of the glue dots, so that the welding ribbon 2 can be fixed to the surface of the solar cell 1 by using the pressure and adhesion of the glue dots on the welding ribbon 2, so as to avoid displacement of the welding ribbon 2 in subsequent process steps. In addition, the position where the first insulating component 4 is set should avoid the area where the second insulating component 5 and the bus bar 3 are to be set.

[0054] Step S2, placing a second insulating component 5 at a set position of the welding ribbon 2. The welding ribbon 2 includes a first welding ribbon 21 and a second welding ribbon 22, and the first welding ribbon 21 and the second welding ribbon 22 are used to connect grid lines with different polarities on the surface of the solar cell 1. The bus bar 3 to be set in the subsequent steps includes a first bus bar 31 and a first bus bar 31, the first bus bar 31 is used to connect to the first welding strip 21, and the first bus bar 31 is used to connect to the second welding strip 22. Since the bus bar 3 and the welding strip 2 have different extension directions, the first bus bar 31 and the first welding strip 21 and the second welding strip 22 may overlap. Therefore, a second insulating component 5 needs to be set at a position where the first bus bar 31 to be set may overlap with the second welding strip 22, thereby forming electrical isolation between the first bus bar 31 and the second welding strip 22. Similarly, the first bus bar 31 and the first welding strip 21 and the second welding strip 22 may overlap. Therefore, a second insulating component 5 needs to be set at a position where the first bus bar 31 to be set may overlap with the first welding strip 21, thereby forming electrical isolation between the first bus bar 31 and the first welding strip 21.

[0055] Step S3, placing the bus bar 3 on the side of the welding ribbon 2 and the second insulating component 5 facing away from the solar cell 1. The bus bar 3 can extend along the second direction Y, and the bus bar 3 is placed in the interval between the first insulating components 4, does not overlap with the first insulating component 4, and overlaps with the welding ribbon 2 to be connected and the second insulating component 5.

[0056] After completing step S3, the preparation method may further include: heating the second insulating component 5 to fix the non-to-be-connected position of the busbar 3 and the welding ribbon 2. This is because the second insulating component 5 can be made of adhesive materials such as EVA or PET, and heating the second insulating component 5 can improve its adhesion, so that the second insulating component 5 can be used to strengthen the connection between the busbar 3 and the welding ribbon 2, and between the second insulating component 5 and the solar cell 1, thereby further fixing the position of the busbar 3 to prevent it from shifting, thereby improving the reliability of the product.

[0057] Step S4, welding the bus bar 3 and the welding ribbon 2 at the position to be connected, so that the bus bar 3 is electrically connected to the solar cell 1 at the position to be connected through the welding ribbon 2. Exemplarily, the bus bar 3 and the welding ribbon 2 can be welded at the overlapping position by spot welding, so that the bus bar 3 and the welding ribbon 2 are welded to the solar cell 1 at one time.

[0058] According to the preparation method adopted in the embodiment of the present application, the welding ribbon 2 is first fixed to the solar cell 1 by the first insulating component 4, and then the bus bar 3, the welding ribbon 2 and the part to be connected of the solar cell 1 can be welded by only one welding. It can be seen that the preparation method provided in the embodiment of the present application does not need to weld the welding ribbon 2 to the solar cell 1 first and then weld the bus bar 3 to the welding ribbon 2, thereby avoiding two weldings at the position to be connected between the bus bar 3 and the welding ribbon 2, avoiding the thermal stress and deformation that may be generated during the second welding process, and avoiding the problems of cold welding and broken grid caused by repeated heating of the welding ribbon 2 or the solar cell, thereby improving the reliability of welding.

[0059] The welding strip 2 may also have parts that are not covered by the first insulating component 4 , the second insulating component 5 or the bus bar 3 , and these parts can be connected to the grid lines on the solar cell 1 by welding.

[0060] In some embodiments of the present application, during the process of welding the bus bar 3 and the welding ribbon 2 at the position to be connected in step S4, the preparation method may further include: welding the welding ribbon 2 and the solar cell 1 at the position where the bus bar 3 and the welding ribbon 2 are not to be connected, so that the electrical connection between the welding ribbon 2 and the solar cell 1 and the electrical connection between the parts to be connected of the bus bar 3, the welding ribbon 2 and the solar cell 1 can be completed in the same step, which is conducive to simplifying the process flow and improving production efficiency.

[0061] In some other embodiments of the present application, after completing step S1, i.e., after fixing the welding ribbon 2 on the surface of the solar cell 1 by using the first insulating component 4, and before performing step S4, i.e., before welding the bus bar 3 and the position to be connected with the welding ribbon 2, the preparation method may further include the following steps: welding the welding ribbon 2 and the solar cell 1 at the position not to be connected between the bus bar 3 and the welding ribbon 2. The above steps may be performed between step S1 and step S2, between step S2 and step S3, or between step S3 and step S4. By avoiding the position not to be connected between the bus bar 3 and the welding ribbon 2, the welding ribbon 2 is welded to the solar cell 1. For each welding position of the welding ribbon 2, only one welding is performed, thereby avoiding repeated heating to have adverse effects on the components. Among them, if the above steps are performed between step S1 and step S2, the portion of the welding ribbon 2 covered by the first insulating component 4 is connected by bonding, and the remaining portions are welded to the solar cell 1; if the above steps are performed between step S2 and step S3, or between step S3 and step S4, the portion of the welding ribbon 2 covered by the first insulating component 4 and the second insulating component 5 is connected to the solar cell 1 by bonding, and the other portions are connected to the solar cell 1 by welding.

[0062] After completing step S4, a battery assembly formed by a plurality of solar cells 1 connected by busbars 3 and welding strips 2 can be obtained. The preparation method can also include: packaging the battery assembly. Exemplarily, the front and back surfaces of the battery assembly can be coated respectively, and placed between the cover plates to form a stacked component formed by sequentially stacking the front cover plate, the front adhesive film, the battery assembly, and the back adhesive film, and then the stacked component is pressed into a whole by a lamination process to form a photovoltaic assembly. The adhesive film and cover plates on the front and back surfaces of the battery assembly can provide protection for the battery assembly and improve the reliability of the photovoltaic assembly.

[0063] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: A plurality of solar cells, wherein the solar cells are back-contact solar cells; A plurality of welding strips, located on the backlight surface of the solar cell, for electrically connecting the adjacent solar cell by welding with the grid lines on the solar cell, the plurality of welding strips comprising a first welding strip and a second welding strip, and on the surface of the same solar cell, the polarity of the grid line connected to the first welding strip is opposite to the polarity of the grid line connected to the second welding strip; A plurality of bus bars, wherein the extension direction of the bus bars intersects with the extension direction of the welding strip, and the orthographic projection of the bus bars on the solar cell sheet overlaps with the orthographic projection of the welding strip on the solar cell sheet, and the bus bars are electrically connected to the backlight surface of the solar cell sheet by welding with the welding strip, and the plurality of bus bars include a first bus bar and a second bus bar, the first bus bar is used to be electrically connected to the first welding strip and insulated from the second welding strip, and the second bus bar is used to be electrically connected to the second welding strip and insulated from the first welding strip.

2. The photovoltaic module according to claim 1, characterized in that: The photovoltaic module further comprises: A plurality of first insulating components are arranged at intervals, the first insulating components cover a partial area of ​​the welding strip, and the first insulating components are used to fix the welding strip to the surface of the solar cell sheet.

3. The photovoltaic module according to claim 2, characterized in that: The first insulating component includes solid glue.

4. The photovoltaic module according to claim 1, characterized in that: The photovoltaic assembly further includes a second insulating component, wherein the second insulating component is located between the first bus bar and the second welding ribbon, and the second insulating component is located between the second bus bar and the first welding ribbon.

5. The photovoltaic module according to claim 4, characterized in that: The second insulating member includes ethylene vinyl acetate or polyethylene terephthalate.

6. A method for preparing a photovoltaic module, characterized in that: The method for preparing the photovoltaic module comprises: Fixing the welding strip on the surface of the solar cell using the first insulating component; placing a second insulating component at a set position of the welding strip; Placing a bus bar on a side of the welding ribbon and the second insulating component away from the solar cell sheet; The bus bar is welded to the position to be connected of the welding ribbon, so that the bus bar is electrically connected to the solar cell sheet at the position to be connected through the welding ribbon.

7. The method for preparing a photovoltaic module according to claim 6, characterized in that: In the process of welding the bus bar and the position to be connected of the welding strip, the method for preparing the photovoltaic module further includes: The welding ribbon and the solar cell are welded at positions where the bus bar and the welding ribbon are not to be connected.

8. The method for preparing a photovoltaic module according to claim 6, characterized in that: After fixing the welding strip on the surface of the solar cell using the first insulating component and before welding the bus bar to the position to be connected with the welding strip, the method for preparing the photovoltaic module further includes: The welding ribbon and the solar cell are welded at positions where the bus bar and the welding ribbon are not to be connected.

9. The method for preparing a photovoltaic module according to claim 7 or 8, characterized in that: After placing the bus bar on the side of the welding ribbon facing away from the solar cell sheet and before welding the bus bar to the position to be connected with the welding ribbon, the method for preparing the photovoltaic module further includes: The second insulating member is heated to fix the bus bar and the welding ribbon at positions not to be connected.

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