JP7609904B2 - Photovoltaic module and method of manufacturing same - Google Patents

Description

This application relates to the field of photovoltaics, and in particular to photovoltaic modules and methods for manufacturing the same.

An interdigitated back contact (IBC) solar cell refers to a back-junction solar cell structure in which positive and negative metal electrodes are arranged in a comb shape on the backlight surface of the cell, and the PN junction and electrodes are located on the back surface of the cell, i.e., the electrodes of the emitter region and base region of an IBC cell are both on the back surface, and there is no grid line shielding on the front surface, which can improve the photoelectric conversion efficiency of the cell.

Generally, the pull-out wire is used to pull out the current collected in the battery grid wire to the outside of the photovoltaic module. One end of the pull-out wire is connected to the end of the busbar of the battery, the pull-out wire is perpendicular to the surface of the photovoltaic module or the surface of the solar cell, and one end of the pull-out wire is connected to a junction box, which is then connected to an external element. With the development of solar cells, the pull-out wire faces a series of risks, such as short circuit.

The embodiments of the present application provide a photovoltaic module and a method for manufacturing the same that are advantageous in solving at least the short circuit problem caused by an excessively small pitch of the pull-out wires.

According to some embodiments of the present application, an embodiment of the present invention provides a photovoltaic module, comprising: a battery module including a plurality of cell string sets; and a first connection structure and a second connection structure, the cell string set includes cell strings arranged at a distance along a first direction X, the cell string set includes a plurality of the cell strings connected in a first electrical connection manner, the cell string includes a plurality of solar cells connected in a first electrical connection manner, the solar cells include a first grid line of a first conductivity type and a second grid line of a second conductivity type, and a pitch between the first grid line and an adjacent second grid line along the first direction is L, the cell string set includes a first cell string set and a second cell string set, and the first cell strings are arranged in a first direction X and a second direction X, the first cell strings are arranged in a first direction X and a second direction X, the second cell strings are arranged in a first direction X and a second cell string set are arranged in a second direction X, the first cell strings are arranged in a first direction X and a second cell string set are arranged in a second direction X, the first cell strings are arranged in a first direction X and a second cell string set are arranged in a second direction X, the second ... The ring set and the second cell string set are connected in a second electrical connection manner, the first connection structure extends along a first direction, the first connection structure is connected to the cell string, the second connection structure is connected to the grid line, and the second connection structure located at the end of the cell string is connected to the first connection structure, the first connection structure includes at least one middle first connection structure, the middle first connection structure is respectively connected to a cell string of the first cell string set and a cell string of the second cell string set, the second connection structure connected to the end of the middle first connection structure is adjacent to the second connection structure connected to the end of the adjacent middle first connection structure, and the distance along the first direction is S, and the distance S is greater than the pitch L between the first grid line and the second grid line of the solar cell.

Also, along the second direction, the first grid line of the solar cell close to the middle first connection structure of the first cell string set is an extension of the first grid line of the solar cell close to the middle first connection structure of the second cell string set, and the second grid line of the solar cell close to the middle first connection structure of the first cell string set is an extension of the second grid line of the solar cell close to the middle first connection structure of the second cell string set.

The first connection structure further includes an end first connection structure, which connects the other end of the cell string away from the middle first connection structure, the number of solar cells in the cell string is odd, the second connection structure connected to the end of the end first connection structure and the second connection structure connected to the end of the adjacent end first connection structure are adjacent along the first direction, and the distance along the first direction is M, and the distance M is greater than twice the pitch L between the first grid lines and the second grid lines of the solar cells.

The first connection structure further includes an end first connection structure, which connects the other end of the cell string away from the middle first connection structure, the number of solar cells in the cell string is an even number, the second connection structure connected to the end of the end first connection structure and the second connection structure connected to the end of the adjacent end first connection structure are adjacent along the first direction, and the distance along the first direction is N, and the distance N is less than twice the pitch L between the first grid lines and the second grid lines of the solar cells.

In addition, the solar cell is a split battery, and the solar cell has an even number of grid lines.

The solar cell is a back-junction type cell.

Furthermore, the second connection structure connected to the end of the central first connection structure and the second connection structure connected to the end of the adjacent central first connection structure are adjacent to each other, and the distance S along the first direction is greater than twice the pitch L between the first grid lines and the second grid lines of the solar cell.

The range of the pitch L between the first grid lines and the second grid lines of the solar cell is 3.5 mm to 20 mm, and/or the second connection structure connected to the end of the central first connection structure is adjacent to the second connection structure connected to the end of the adjacent central first connection structure, and the range of the distance S along the first direction is 8 mm to 50 mm.

The cell string set also includes a first cell string and an adjacent second cell string, and the grid lines of the edges of the solar cells on the first cell string are adjacent to the grid lines of the edges of the solar cells on the second cell string and are of opposite conductivity type.

According to some examples of the present application, an embodiment of the present invention provides a photovoltaic module, provides an initial battery, and forms a battery module, wherein a plurality of solar cells are connected to form a cell string in a first electrical connection manner by a second connection structure, the plurality of cell strings are connected to form a cell string set in a first electrical connection manner, the cell strings are arranged at a distance along a first direction, the plurality of cell string sets constitute the battery module, the solar cells have a first grid line of a first conductivity type and a second grid line of a second conductivity type, and a pitch between the first grid line and the adjacent second grid line along the first direction is L, the cell string set includes a first cell string set and a second cell string set, and the first cell string set and the second cell string set are connected to form a cell string set ... second direction. The cell string set is connected in a second electrical connection manner; and forming a first connection structure and a second connection structure, the first connection structure extending along a first direction, the first connection structure connected to the cell string, and the second connection structure connected to the grid line, the first connection structure including at least one middle first connection structure, the middle first connection structure respectively connected to a cell string of the first cell string set and a cell string of the second cell string set, the second connection structure of the solar cell located at the end of the cell string is connected to the middle first connection structure, the second connection structure connected to the end of the middle first connection structure is adjacent to the second connection structure connected to the end of the adjacent middle first connection structure, and the distance along the first direction is S, the distance S being greater than the pitch L between the first grid line and the second grid line of the solar cell.

In addition, when the number of solar cells in the cell string is an even number, the step of forming the first cell string set and the second cell string set includes forming a third cell string and a fourth cell string, forming a first cell string set and a second cell string set, and configuring the first cell string set by arranging a plurality of the third cell strings and the third cell string rotated by 180 degrees at a distance along the first direction, and configuring the second cell string set by arranging a plurality of the fourth cell strings and the fourth cell string rotated by 180 degrees at a distance.

In addition, when the number of solar cells in the cell string is an odd number, the step of forming the cell string set includes forming a fifth cell string and a sixth cell string, forming the cell string set, and configuring the cell string set by arranging a plurality of the fifth cell strings and a sixth cell string rotated 180 degrees at a distance along the first direction.

The solar cell includes a first battery cell and a second battery cell, and the initial battery is divided to form the first battery cell and the second battery cell, which are symmetrical along the cut line of the initial battery. The third cell string or the fifth cell string is configured by arranging the first battery cell and the second battery cell rotated 180 degrees at a distance along the second direction, and the fourth cell string or the sixth cell string is configured by arranging the second battery cell and the first battery cell rotated 180 degrees at a distance along the second direction.

The step of forming the second connection structure further includes connecting the second connection structure to a first grid line having a first conductivity type in the first battery cell and a second grid line having a second conductivity type opposite the first grid line in the second battery cell, or connecting the second connection structure to a second grid line having a second conductivity type in the first battery cell and a first grid line having a first conductivity type opposite the first grid line in the second battery cell.

The technical ideas provided in the embodiments of the present invention have at least the following advantages:

In the embodiment of the present invention, the configuration of the cell string and the arrangement of the cell strings in the cell string set are changed to ensure that the second connection structure connected to the end of the central first connection structure and the second connection structure connected to the end of the adjacent central first connection structure are adjacent to each other, and the distance along the first direction is S, and the distance S is greater than the distance L between the first grid line and the second grid line of the solar cell. Therefore, the pitch between the lead lines connected to the adjacent central first connection structures is large, which avoids the risk of short circuiting, and the pitch between the adjacent lead lines is large, i.e., the adjacent lead lines do not contact each other, so there is no need to insulate the adjacent lead lines with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and helps reduce manufacturing costs.

One or more embodiments are illustratively described in the figures in the corresponding attached drawings, but these illustrative descriptions are not intended to limit the embodiments, and unless otherwise specified, the figures in the attached drawings are not limited to scale. In order to more clearly explain the embodiments of the present application and the technical solutions of the prior art, the drawings to be used in the embodiments are briefly introduced below, but it is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings from these drawings without creative labor.
FIG. 1 is an electrical circuit diagram of a battery module provided in one embodiment of the present invention. FIG. 2 is a schematic diagram of a photovoltaic module provided in one embodiment of the present invention. FIG. 3 is a schematic diagram showing a local configuration of a photovoltaic module provided in one embodiment of the present invention. FIG. 4 is a schematic diagram showing a local configuration of a photovoltaic module provided in one embodiment of the present invention. FIG. 5 is a schematic diagram showing a local configuration of a photovoltaic module provided in one embodiment of the present invention. FIG. 6 is a schematic diagram of another photovoltaic module provided in one embodiment of the present invention. FIG. 7 is a schematic local configuration diagram of another photovoltaic module provided in one embodiment of the present invention. FIG. 8 is a schematic diagram showing a local configuration of another photovoltaic module provided in one embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of a photovoltaic module provided in one embodiment of the present invention. FIG. 10 is a schematic diagram of an initial cell formed in a method for manufacturing a photovoltaic module provided in one embodiment of the present invention. FIG. 11 is a schematic diagram of a solar cell formed by a method for manufacturing a photovoltaic module provided in one embodiment of the present invention. FIG. 12 is a schematic diagram of a third cell string formed by the method for manufacturing a photovoltaic module provided in one embodiment of the present invention. FIG. 13 is a schematic diagram of a fourth cell string formed by the method for manufacturing a photovoltaic module provided in one embodiment of the present invention. FIG. 14 is a schematic diagram of a cell string set formed by a method for manufacturing a photovoltaic module provided in one embodiment of the present invention. FIG. 15 is a schematic diagram of a fifth cell string formed by the method for manufacturing a photovoltaic module provided in one embodiment of the present invention. FIG. 16 is a schematic diagram of a sixth cell string formed by a method for manufacturing a photovoltaic module according to an embodiment of the present invention. FIG. 17 is another schematic diagram of a cell string set formed by the method for manufacturing a photovoltaic module provided in one embodiment of the present invention.

As can be seen from the background art, conventional photovoltaic modules have short circuit problems due to wire pitches that are too small.

One of the causes of the above-mentioned small pitch of the lead wires is that the manufacturing and arrangement of cell strings made of current IBC cells are almost the same as those of conventional batteries (non-back junction type batteries). The positive and negative electrodes of IBC cells are generally arranged in parallel at a distance from each other, and because conventional cell string manufacturing and arrangement techniques are used, the pitch of the lead wires between adjacent cell strings is too small, which further leads to the risk of short circuits due to the small pitch of the lead wires.

In the embodiment of the present invention, the configuration of the cell string and the arrangement of the cell strings in the cell string set are changed to ensure that the second connection structure connected to the end of the central first connection structure and the second connection structure connected to the end of the adjacent central first connection structure are adjacent to each other, and the distance along the first direction is S, and the distance S is greater than the distance L between the first grid line and the second grid line of the solar cell. Therefore, the pitch between the lead lines connected to the adjacent central first connection structures is large, which avoids the risk of short circuiting, and the pitch between the adjacent lead lines is large, i.e., the adjacent lead lines do not contact each other, so there is no need to insulate the adjacent lead lines with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and helps reduce manufacturing costs.

Each embodiment of the present application will be described in detail below with reference to the accompanying drawings. However, as will be understood by those skilled in the art, many technical details are proposed in each embodiment of the present application in order to allow the reader to better understand the present application, but even without these technical details, the technical solution sought to be protected by the present application can be realized through various changes and modifications based on each embodiment below.

1 is an electrical circuit diagram of a battery module provided in one embodiment of the present invention, FIG. 2 is a schematic diagram of a photovoltaic module provided in one embodiment of the present invention, FIG. 3 is one of the local schematic diagrams of a photovoltaic module provided in one embodiment of the present invention, FIG. 4 is one of the local schematic diagrams of a photovoltaic module provided in one embodiment of the present invention, FIG. 5 is one of the local schematic diagrams of a photovoltaic module provided in one embodiment of the present invention, FIG. 6 is a schematic diagram of another photovoltaic module provided in one embodiment of the present invention, FIG. 7 is a local schematic diagram of another photovoltaic module provided in one embodiment of the present invention, FIG. 8 is one of the local schematic diagrams of another photovoltaic module provided in one embodiment of the present invention, and FIG. 9 is a cross-sectional schematic diagram of a photovoltaic module provided in one embodiment of the present invention. In the figures, the thickness of the lines indicates the distinction between the first grid lines and the second grid lines, in which the thin lines are the first grid lines and the thick lines are the second grid lines. The middle in the middle first connection structure refers to the pitch between two cell string sets connected in the second electrical connection manner along the second direction Y or the middle of the battery module set, and the end in the end first connection structure refers to the end of the battery module set or the end of the cell string set close to the edge of the battery module along the second direction Y.

As shown in Figures 1 to 8, the photovoltaic module includes a battery module 10 including a plurality of cell string sets, the cell string set including cell strings 20 spaced apart along a first direction X, the cell string set including a plurality of cell strings 20 connected by a first electrical connection method, the cell string 20 including a plurality of solar cells 200 connected by a first electrical connection method, the solar cells 200 including a first grid line 201 of a first conductivity type and a second grid line 202 of a second conductivity type, and the pitch between the first grid line 201 and the adjacent second grid line 202 along the first direction X is L, the cell string set including a first cell string set 11 and a second cell string set 12, and the first cell string set 11 and the second cell string set 12 are connected along the second direction Y by a second electrical connection method. the first connection structure extends along a first direction X, the first connection structure is connected to the cell string 20, the second connection structure 40 is connected to the grid line 210, and the second connection structure 40 located at the end of the cell string is connected to the first connection structure, the first connection structure includes at least one middle first connection structure 31, the middle first connection structure 31 is respectively connected to the cell string 20 of the first cell string set 11 and the cell string 20 of the second cell string set 12, the second connection structure 40 connected to the end of the middle first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent middle first connection structure 31, and the distance along the first direction X is S, the distance S is greater than the pitch L between the first grid line 201 and the second grid line 202 of the solar cell. By changing the configuration structure of the cell string 20 and the arrangement method of the cell string 20 in the cell string set, the second connection structure 40 connected to the end of the middle first connection structure 31 and the second connection structure 40 connected to the end of the adjacent middle first connection structure 31 are adjacent to each other, and the distance along the first direction X is S, and the distance S is greater than the pitch L between the first grid line 201 and the second grid line 202 of the solar cell. Therefore, the pitch between the lead lines connected to the adjacent middle first connection structures 31 is large, which avoids the risk of short circuit, and the pitch between the adjacent lead lines is large, i.e., the adjacent lead lines do not contact each other, so there is no need to insulate them with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and reduces manufacturing costs.

The solar cell 200 is a split battery. In some embodiments, the split battery is a half-split battery, which can be understood as a half-cut battery or a two-split battery, and in other embodiments, the split battery can be a three-split battery, a four-split battery, or an eight-split battery, etc. The solar cell 200 is a back-junction type battery, and the solar cell 200 has a grid line 210, which is the main grid line of the solar cell 200 or an electrode of the solar cell 200, and the grid line 210 is divided into a first grid line 201 of a first conductivity type and a second grid line 202 of a second conductivity type according to the conductivity type, and the first grid line 201 and the second grid line 202 can be arranged at a distance in the first direction X. The number of grid lines 210 may be any value, and is usually 8 to 30, and the number of the first grid lines 201 and the second grid lines 202 may be equal. Preferably, the number of grid lines 210 is 14-22, specifically 8, 10, 12, 14, 16, 18, 20. The width of grid lines 210 is 40-80 μm, specifically 40 μm, 50 μm, 60 μm, 70 μm, or 80 μm, and the width of grid lines 210 is 50 μm-60 μm, specifically 50 μm, 53 μm, 56 μm, or 60 μm. In some other embodiments, the number of first grid lines 201 and second grid lines 202 is not equal, specifically 7, 9, 11, 13, 15, 17, or 19, for example, the number of first grid lines 201 may be 4, and the number of second grid lines 202 may be 3. In one specific example, a solar cell 200 having eight grid lines 210 is used, where the grid lines 210 include four first grid lines 201 and four second grid lines 202, the first conductivity type is positive, the second conductivity type is negative, the first electrical connection method is series connection, and the second electrical connection method is parallel connection.

In some embodiments, the solar cell 200 further includes fine grid lines, and the number of fine grid lines may be any number, typically 100-250, and more preferably 100, 110, 120, 130, 140, 150, 160, 170, or 180. Preferably, the number of fine grid lines is 140-180, and more preferably 148, 150, 156, 166, 171, 178, or 180. The width of the fine grid lines is 20 μm-60 μm, and more preferably 20 μm, 30 μm, 40 μm, 50 μm, or 60 μm. Preferably, the width of the fine grid lines is 20 μm-40 μm, and more preferably 23 μm, 26 μm, 34 μm, or 39 μm. The number of soldering spots on the grid line 210 is 8-20, and the area of each soldering spot is the same; in other embodiments, the areas of the soldering spots may be different, for example, the area of the soldering spots located at both ends of the grid line 210 is larger than the area of the soldering spots other than the ends of the grid line 210. The soldering spots are considered to be contact points where the grid line 210 and the second connection structure 40 come into contact.

In some embodiments, a back junction cell includes a silicon substrate having a first doped region and a second doped region located in a front surface field region FSF (same conductivity type as the silicon substrate) and a first passivation layer on a first surface of the silicon substrate or located on a second surface of the silicon substrate, a second passivation layer located on the silicon substrate surface in the first doped region and the second doped region, a first electrode penetrating the second passivation layer and connected to the first doped region, and a second electrode penetrating the second passivation layer and connected to the second doped region. In some other embodiments, a back junction cell includes a silicon substrate with a first doped region located in a first passivation layer on a first surface of the silicon substrate or located on a second surface of the silicon substrate, the first doped region being of the same conductivity type as the silicon substrate or of a different conductivity type than the silicon substrate, a tunnel oxide layer and a doped polysilicon layer located on the second surface of the silicon substrate, a second passivation layer located on the first doped region and the surface of the doped polysilicon layer, a first electrode penetrating the second passivation layer and connected to the doped polysilicon layer, and a second electrode penetrating the second passivation layer and connected to the first doped region. In some other embodiments, the back junction cell includes a silicon substrate with a tunnel oxide layer, a first doped polysilicon layer, and a second doped polysilicon layer, the tunnel oxide layer being located on a first passivation layer on a first surface of the silicon substrate or on a second surface of the silicon substrate; a second passivation layer located on the first doped polysilicon layer, the second doped polysilicon layer, and the surface of the silicon substrate; a first electrode penetrating the second passivation layer and connected to the first doped polysilicon layer; and a second electrode penetrating the second passivation layer and connected to the second doped polysilicon layer. The first surface is the surface of the silicon substrate, the second surface is the back surface of the silicon substrate, the first doped region is one of an N-type doped region or a P-type doped region, and the second doped region is the other of the N-type doped region or the P-type doped region.

In some embodiments, the thickness of the solar cells may be 100 μm to 300 μm, more specifically 100 μm, 180 μm, 220 μm, or 300 μm, and preferably the thickness of the solar cells is 120 to 180 μm, more specifically 120 μm, 134 μm, 153 μm, or 179 μm. In other embodiments, the size of the entire solar cell 200 sheet may be 150 mm to 300 mm, more specifically 156.75 mm, 158.75 mm, 166 mm, 182 mm, or 210 mm, and the shape of the solar cells 200 may be rectangular, circular, square, approximately rectangular, etc. In some other embodiments, the solar cell may have a thickness-to-width ratio of 0.5×10 to 2×10, more preferably 0.5×10, 0.8×10, 1.6×10, or 1.89×10, and preferably 1×10 to 1.8×10, more preferably 1.1×10, 1.32×10, 1.65×10, or 1.79×10. In some other embodiments, the solar cell 200 may be a monocrystalline silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, or a multicomponent solar cell, and more preferably the multicomponent solar cell may be a cadmium sulfide solar cell, a gallium arsenide solar cell, a copper indium selenium solar cell, or a perovskite solar cell. In one specific example, the thickness-to-width ratio of the solar cell 200 is 1×103, the thickness of the solar cell is 166 μm, the size of the entire solar cell 200 sheet is 166 mm, the shape of the solar cell 200 is rectangular, and the solar cell 200 may be a monocrystalline silicon solar cell.

In some embodiments, the cell string set includes a first cell string 21 and an adjacent second cell string 22, and the grid lines 210 of the edges of the solar cells 200 on the first cell string 21 are adjacent to the grid lines 210 of the edges of the solar cells 200 on the second cell string 22 and have opposite conductivity types. The second connection structure 40 connected to the end of the middle first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent middle first connection structure 31, and has a distance S along the first direction X, where the distance S is greater than twice the pitch L between the solar cell first grid lines 201 and the second grid lines 202.

In some embodiments, the cell string set is divided into first cell strings 21 and second cell strings 22 in the first direction X, and the first cell strings 21 and second cell strings 22 are arranged parallel to each other in the first direction X at a distance, and the positive and negative poles of the first cell strings 21 and the second cell strings 22 are opposite in direction or the current flows in opposite directions. A cell string set having an overall rectangular shape is formed by connecting the positive pole of the first cell string 21 to the negative pole of the second cell string 22 and connecting the positive pole of the second cell string 22 to the negative pole of another adjacent first cell string 21 in a connection order.

In some embodiments, the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the first cell string set 11 faces directly, and the second grid line 202 of the solar cell 200 close to the middle first connection structure 31 of the first cell string set 11 faces directly, and the second grid line 202 of the solar cell 200 close to the middle first connection structure 31 of the second cell string set 12 faces directly. Therefore, the second connection structure 40 located above the middle first connection structure 31 along the second direction Y and connected to the first grid line 201 faces directly, and the second connection structure 40 below faces directly, and the length of the middle first connection structure 31 can be reduced compared to a positional relationship where they are not directly opposed, which means that the use of material is reduced and manufacturing costs are reduced.

In some embodiments, along the second direction Y, the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the first cell string set 11 is an extension of the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the second cell string set 22, and the second grid line 202 of the solar cell 200 close to the middle first connection structure 31 of the first cell string set 11 is an extension of the second grid line 202 of the solar cell 200 close to the middle first connection structure 31 of the second cell string set 12. In some other embodiments, as shown in FIG. 4 , along the second direction Y, the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the first cell string set 11 is close to an extension of the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the second cell string set 12, the pitch between the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the first cell string set 11 and the extension of the first grid line 201 of the solar cell 200 close to the middle first connection structure 31 of the second cell string set 12 is W, and the range of the pitch W is the distance between the first grid line 201 and the second grid line 202 of the solar cell 200. The pitch is less than 0.5 times the pitch L, and the second grid line 202 of the solar cell 200 close to the central first connection structure 31 of the first cell string set 11 is close to the extension of the second grid line 202 of the solar cell 200 close to the central first connection structure 31 of the second cell string set 12, and the pitch of the second grid line 202 of the solar cell 200 close to the central first connection structure 31 of the first cell string set 11 and the extension of the second grid line 202 of the solar cell 200 close to the central first connection structure 31 of the second cell string set 12 is U, and the range of the pitch U is less than 0.5 times the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200.

In some embodiments, the middle first connection structure 31 can prevent the number of cell strings connected in parallel to the end first connection structure 32 from exceeding the reverse bias limit of the battery and destroying the photovoltaic module. The first connection structure further includes an end first connection structure 32, which is an end bus bar, and connects the other ends of the cell strings away from the middle first connection structure 31, and the end first connection structure 32 is provided at both ends of the battery module.

In some embodiments, as shown in FIG. 5, the number of solar cells 200 in the cell string is an odd number, the second connection structure 40 connected to the end of the end first connection structure 32 and the second connection structure 40 connected to the end of the adjacent end first connection structure 32 are adjacent along the first direction X, and the distance along the first direction X is M, the distance M being greater than twice the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200. In some other embodiments, as shown in FIG. 8, the number of solar cells 200 in the cell string is an even number, the second connection structure 40 connected to the end of the end first connection structure 32 and the second connection structure 40 connected to the end of the adjacent end first connection structure 32 are adjacent along the first direction X, and the distance along the first direction X is N, the distance N being less than twice the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200. In some embodiments, the photovoltaic module further includes a lead wire (not shown in the figure) and a junction box (not shown in the figure), the lead wire is connected to the central first connection structure 31, adjacent lead wires are respectively connected to the positive output side or negative output side of the cell string 20 and the other of the positive output side or negative output side of the adjacent cell string 20, and there is a diode in the junction box, both ends of which are connected in anti-parallel to the cell string via the lead wire, to avoid exceeding the reverse bias limit of the battery and destroying the photovoltaic module.

In some embodiments, the pitch L between the first grid lines 201 and the second grid lines 202 of the solar cell 200 may range from 3.5 mm to 20 mm, specifically 4 mm, 8 mm, 12 mm, 16 mm, or 19 mm, and preferably, the pitch L between the first grid lines 201 and the second grid lines 202 of the solar cell 200 may range from 4 mm to 10 mm, specifically 4.3 mm, 5.6 mm, 6.3 mm, 8.2 mm, or 9.9 mm. The second connection structure 40 connected to the end of the middle first connection structure 31 and the second connection structure 40 connected to the end of the adjacent middle first connection structure 31 are adjacent to each other, and the distance S along the first direction X may range from 8 mm to 50 mm, specifically 9 mm, 20 mm, 30 mm, 40 mm, or 45 mm. Preferably, the second connection structure 40 connected to the end of the middle first connection structure 31 and the second connection structure 40 connected to the end of the adjacent middle first connection structure 31 are adjacent to each other, and the range of the distance S along the first direction X is 10 mm to 25 mm, specifically, it may be 12 mm, 15 mm, 16.9 mm, 19 mm, 23.9 mm. In a specific example, the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200 is 4.3 mm, the second connection structure 40 connected to the end of the middle first connection structure 31 and the second connection structure 40 connected to the end of the adjacent middle first connection structure 31 are adjacent to each other, and the distance S along the first direction X is 12 mm, and the distance S is greater than twice the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200. For this reason, the pitch between the lead wires connected to adjacent central first connection structures 31 is large, which avoids the risk of short circuits, and because the pitch between adjacent lead wires is large, meaning that adjacent lead wires do not come into contact with each other, there is no need to insulate them with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and reduces manufacturing costs.

In some embodiments, as shown in FIG. 9, the photovoltaic module further includes a cover plate 51 and a sealing layer 52. The sealing layer 52 may be an organic sealing film such as EVA or POE, which covers and seals the surface of the cell string, and the cover plate 51 may be a glass cover plate or a plastic cover plate, etc., which covers the surface of the sealing layer remote from the cell string. The cover plate 51 is provided with a light trapping structure to enhance the utilization rate of the incident light. The photovoltaic module has a high current collection capability and a low carrier recombination rate, and can achieve a high photoelectric conversion efficiency.

In the embodiment of the present invention, by changing the configuration structure of the cell string 20 and the arrangement method of the cell string in the cell string set, a photovoltaic module is provided in which the second connection structure 40 connected to the end of the middle first connection structure 31 and the second connection structure 40 connected to the end of the adjacent middle first connection structure 31 are adjacent to each other, and the distance along the first direction is S, and the distance S is greater than the pitch L between the solar cell first grid line 201 and the second grid line 202. Therefore, the pitch between the adjacent drawers connected to the middle first connection structure 31 is large, avoiding the risk of short circuit, and the pitch between the adjacent drawers is large, i.e., the adjacent drawers do not contact each other, so there is no need to insulate with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and reduces manufacturing costs.

Based on some embodiments of the present invention, an embodiment of the present invention further provides a method for manufacturing a photovoltaic module, which is used to form the photovoltaic modules included in the above embodiments.

10 is a schematic diagram of an initial cell formed in a method for manufacturing a photovoltaic module provided in one embodiment of the present invention. As shown in FIG. 10, an initial cell 220 is provided, the initial cell 220 is a back-junction solar cell, and the initial cell 220 has an even number of grid lines 210, the grid lines 210 are main grid lines of the initial cell 220 or electrodes of the initial cell 220, and the grid lines 210 are divided into first grid lines 201 of a first conductivity type and second grid lines 202 of a second conductivity type according to the conductivity type, the first grid lines 201 and the second grid lines 202 are arranged at a distance from each other along the first direction X, and the pitch between the first grid lines 201 and the adjacent second grid lines 202 along the first direction X is L. The number of grid lines 210 may be any value, typically 8-30, as long as the number of first grid lines 201 and second grid lines 202 is equal, and preferably the number of grid lines 210 is 14-22, specifically 8, 10, 12, 14, 16, 18, or 20. The width of the grid lines 210 is 40 μm-80 μm, and preferably the width of the grid lines 210 is 50 μm-60 μm, specifically 50 μm, 53 μm, 56 μm, or 60 μm. In some other embodiments, the number of the first grid lines 201 and the second grid lines 202 is not equal, for example, the number of the first grid lines 201 is four, and the number of the second grid lines 202 is three. Specifically, for an initial battery 220 having eight grid lines 210, the first conductivity type is positive and the second conductivity type is negative.

Figure 11 is a schematic diagram of a solar cell formed by a method for manufacturing a photovoltaic module provided in one embodiment of the present invention. As shown in Figure 11, an initial battery 220 is divided to form a solar cell, which includes a first battery cell 221 and a second battery cell 222. The initial battery 220 is divided to form the first battery cell 221 and the second battery cell 222, and is symmetrical along the cut line A1-A2 (see Figure 10) of the initial battery. The first battery cell 221 has four first grid lines 201 and four second grid lines 202, and the first grid lines 201 and the second grid lines 202 are arranged at a distance from each other. Similarly, the second battery cell 222 has four first grid lines 201 and four second grid lines 202, and the first grid lines 201 and the second grid lines 202 are arranged at a distance from each other.

In some other embodiments, the solar cell includes a first battery cell, a second battery cell, and a third battery cell, i.e., the solar cell is a three-part battery. In some other embodiments, the solar cell is a four-part battery or an eight-part battery.

Figure 12 is a schematic diagram of a third cell string formed by the manufacturing method of a photovoltaic module provided in one embodiment of the present invention, Figure 13 is a schematic diagram of a fourth cell string formed by the manufacturing method of a photovoltaic module provided in one embodiment of the present invention, Figure 15 is a schematic diagram of a fifth cell string formed by the manufacturing method of a photovoltaic module provided in one embodiment of the present invention, and Figure 16 is a schematic diagram of a sixth cell string formed by the manufacturing method of a photovoltaic module provided in one embodiment of the present invention.

As shown in Figures 12, 13, 15 and 16, a cell string including a third cell string 23, a fourth cell string 24, a fifth cell string 25 and a sixth cell string 26 is formed, and the third cell string 23 or the fifth cell string 25 is arranged such that a first battery cell 221 and a second battery cell 222 rotated 180 degrees are arranged at a distance along the second direction Y, and the fourth cell string 24 or the sixth cell string 26 is arranged such that a second battery cell 222 rotated 180 degrees and a first battery cell 221 are arranged at a distance along the second direction Y.

In some embodiments, the specific steps for forming the third cell string 23 and the fifth cell string 25 are:

S1: Electrical connection between the second connection structure 40 and the first grid line 201 of the first battery cell 221 is realized by a method such as soldering or bonding, and the second connection structure 40 extends along the extension direction of the grid line 210 and exceeds one edge of the first battery cell 221;

S2: Rotate the second battery cell 222 by 180 degrees, and ensure that the polarity of the grid line 210 of the second battery cell 222 along the extension direction of the grid line 210 is different from that of the grid line 210 of the first battery cell 221, and that the extension lines of both are on the same horizontal line or overlap, that is, the second grid line 202 of the second battery cell 222 and the first grid line 201 of the first battery cell 221 are directly opposite each other, and the second connection structure 40 connects to the second main grid on the first battery cell 221 and the first grid line 201 of the second battery cell 222 respectively;

S3: After placing another first battery cell 221 on the second battery cell 222, the second connection structure 40 is used to electrically connect the second grid line 202 on the second battery cell 222 to which the second connection structure 40 is not soldered and the first grid line 201 on the first battery cell 221.

S2 and S3 are repeated until the soldering of the last battery cell of each cell string and the soldering of the second connection structure 40 to the grid line 210 of the last battery cell of the cell string are completed, and the second connection structure 40 extends along the extension direction of the grid line 210 beyond one edge of the first battery cell 221.

As shown in FIG. 12, when the number of solar cells in the cell string is an even number, the last battery cell of the cell string is the second battery cell 222, which is located directly in front of the second connection structures 40 at both ends of the cell string, or on an extension of the second connection structure 40 connected to the last battery cell of the cell string, which is connected to the first battery cell 221 of the cell string. The cell string formed is the third cell string 23.

As shown in FIG. 15, when the number of solar cells in the cell string is an odd number, the last battery cell in the cell string is the first battery cell 221, and the pitch between the second connection structures 40 located at both ends of the cell string along the first direction X is the pitch L between the first grid line 201 and the second grid line 202, i.e., the pitch between the second connection structure 40 connected to the first battery cell in the cell string and the extension line of the second connection structure 40 connected to the last battery cell in the cell string is the pitch L between the first grid line 201 and the second grid line 202 (see FIG. 11). The cell string formed is the fifth cell string 25.

In some embodiments, the specific steps for forming the fourth cell string 24 and the sixth cell string 26 are:

S1: Rotate the second battery cell 222 by 180°, and realize an electrical connection between the second connection structure 40 and the first grid line 201 of the second battery cell 222 by a method such as soldering or bonding, so that the second connection structure 40 extends along the extension direction of the grid line 210 and exceeds one edge of the second battery cell 222;

S2: The first battery cell 221 is placed on one side away from the second connection structure 40 of the second battery cell 222, and the polarity of the grid line 210 of the second battery cell 222 along the extension direction of the grid line 210 is different from that of the grid line 210 of the first battery cell 221, and the extension lines of both are on the same horizontal line or overlap, that is, the second grid line 202 of the second battery cell 222 and the first grid line 201 of the first battery cell 221 are directly opposite each other, and the second connection structure 40 is respectively connected to the first main grid on the first battery cell 221 and the second grid line 202 of the second battery cell 222;

S3: Rotating another second battery cell 222 180 degrees and placing it on the first battery cell 221, and then electrically connecting the second grid line 202 on the first battery cell 221 to which the second connection structure 40 is not soldered and the first grid line 201 on the second battery cell 222 by the second connection structure 40.

S2 and S3 are repeated until the soldering of the last battery cell of each cell string and the soldering of the second connection structure 40 to the grid line 210 of the last battery cell of the cell string are completed, and the second connection structure 40 extends along the extension direction of the grid line 210 beyond one edge of the first battery cell 221.

As shown in FIG. 13, when the number of solar cells in the cell string is an even number, the last battery cell of the cell string is the first battery cell 221, which is located directly in front of the second connection structures 40 at both ends of the cell string, or on an extension of the second connection structure 40 connected to the last cell of the cell string and the second connection structure 40 connected to the first battery cell of the cell string. The cell string formed is the fourth cell string 24.

As shown in FIG. 16, when the number of solar cells in the cell string is an odd number, the last battery cell in the cell string is the second battery cell, and the pitch between the second connection structures 40 located at both ends of the cell string along the first direction X is the pitch L between the first grid line 201 and the second grid line 202, i.e., the pitch between the second connection structure 40 connected to the first battery cell in the cell string and the extension line of the second connection structure 40 connected to the last battery cell in the cell string is the pitch L between the first grid line 201 and the second grid line 202 (see FIG. 11). The cell string formed is the sixth cell string 26.

The first battery cell 221 and the second battery cell 222 are symmetrical along the cut line A1-A2 (see FIG. 10) of the initial battery 220, and the first battery cell 221 and the second battery cell 222 shown in the figure are examples only, and it is considered that the battery cell located on the upper side may be either the first battery cell 221 or the second battery cell 222.

Figure 14 is a schematic diagram of a cell string set formed by a method for manufacturing a photovoltaic module provided in one embodiment of the present invention, and Figure 17 is another schematic diagram of a cell string set formed by a method for manufacturing a photovoltaic module provided in one embodiment of the present invention.

As shown in FIG. 14 and FIG. 17, a cell string set is formed, in which a plurality of cell strings are connected in a first electrical connection manner to form a cell string set, and the cell strings 20 are arranged at intervals along a first direction X, and the cell string set includes a first cell string 21 and a second cell string 22 adjacent thereto, and the edge grid lines 210 of the solar cells 200 on the first cell string 21 and the edge grid lines 210 of the solar cells 200 on the second cell string 22 are adjacent and have opposite conductivity types. The cell string set includes a first cell string set 11 and a second cell string set 12, and the first cell string set 11 and the second cell string set 12 are connected in a second electrical connection manner along a second direction Y. Specifically, the first electrical connection manner is a series connection, and the second electrical connection manner is a parallel connection.

In some embodiments, the number of cell strings is an even number, as shown in FIG. 14, and the step of forming the first cell string set 11 and the second cell string set 12 includes arranging a plurality of third cell strings and a third cell string rotated by 180 degrees at a distance along the first direction X to form the first cell string set 11, and arranging a plurality of fourth cell strings and a fourth cell string rotated by 180 degrees at a distance along the first direction X to form the second cell string set 12. In other embodiments, as shown in FIG. 17, a cell string set is formed, and a plurality of fifth cell strings and a sixth cell string rotated by 180 degrees at a distance along the first direction X to form the cell string set.

Furthermore, as shown in Figures 14 and 17, a battery pack is formed, and multiple cell string sets constitute a battery module.

In some embodiments, the method for manufacturing a photovoltaic module further includes forming a first connection structure and a second connection structure 40, the first connection structure extending along a first direction X, the first connection structure and the cell string are connected, the second connection structure 40 and the grid line 210 are connected, the first connection structure has at least one middle first connection structure 31, the middle first connection structure 31 is connected to the cell string of the first cell string set 11 and the cell string of the second cell string set 12, respectively, the second connection structure 40 of the solar cell 200 at the end of the cell string is connected to the middle first connection structure 31, the second connection structure 40 connected to the end of the middle first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent middle first connection structure 31, and the distance along the first direction X is S, the distance S is greater than the distance L between the solar cell first grid line 201 and the second grid line 202. Therefore, the pitch between the lead wires connected to the adjacent central first connection structures 31 is large, which avoids the risk of short circuit, and the pitch between the adjacent lead wires is large, i.e., the adjacent lead wires do not contact each other, so there is no need to insulate them with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and reduces manufacturing costs. In some other embodiments, the second connection structure 40 connected to the end of the central first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent central first connection structure 31, and the distance along the first direction X is S, and the distance S is greater than twice the pitch L between the solar cell first grid line 201 and the second grid line 202.

In some embodiments, the first connection structure further includes an end first connection structure 32, which is an end bus bar, and the end first connection structure 32 is connected to the other end of the cell string away from the middle first connection structure 31, and the end first connection structure 32 is provided at both ends of the battery module, respectively.

In some embodiments, as shown in FIG. 17, the number of solar cells 200 in the cell string is an odd number, and along the first direction X, the second connection structure 40 connected to the end of the end first connection structure 32 is adjacent to the second connection structure 40 connected to the end of the adjacent end first connection structure 32, the distance along the first direction X is M, and the distance M is greater than twice the distance L between the first grid line 201 and the second grid line 202 of the solar cell 200. In other embodiments, as shown in FIG. 12, the number of solar cells 200 in the cell string is an even number, and along the first direction X, the second connection structure 40 connected to the end of the end first connection structure 32 is adjacent to the second connection structure 40 connected to the end of the adjacent end first connection structure 32, the distance along the first direction X is N, and the distance N is less than twice the distance L between the first grid line 201 and the second grid line 202 of the solar cell 200.

In some embodiments, the step of forming the second connection structure 40 includes the second connection structure 40 being connected to a first grid line 201 having a first conductivity type in the first battery cell 221 and a second grid line 202 facing the second battery cell 222 and having a second conductivity type, respectively, or the second connection structure 40 being connected to a second grid line 202 having a second conductivity type in the first battery cell 221 and a first grid line 201 facing the second battery cell 222 and having a first conductivity type, respectively.

In some embodiments, after forming the battery module, the method further includes forming an outgoing wire and a junction box, where the outgoing wire is connected to the middle first connection structure 31, the adjacent outgoing wires are respectively connected to the positive output side or negative output side of the cell string and the other side of the positive output side or negative output side of the adjacent cell string 20, and there is a diode in the junction box, both ends of which are connected in anti-parallel to the cell string via the outgoing wire to avoid exceeding the battery reverse bias limit and destroying the photovoltaic module.

In some embodiments, the pitch L between the first grid lines 201 and the second grid lines 202 of the solar cell ranges from 3.5 mm to 20 mm, and preferably the pitch L between the first grid lines 201 and the second grid lines 202 of the solar cell 200 ranges from 4 mm to 10 mm, and may be specifically 4.3 mm, 5.6 mm, 6.3 mm, 8.2 mm, or 9.9 mm. The second connection structure 40 connected to the end of the middle first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent middle first connection structure 31, and the distance S along the first direction X ranges from 8 mm to 50 mm. Preferably, the second connection structure 40 connected to the end of the middle first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent middle first connection structure 31, and the range of the distance S along the first direction X is 10 mm to 25 mm, specifically, it may be 12 mm, 15 mm, 16.9 mm, 19 mm, 23.9 mm. In a specific example, the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200 is 4.3 mm, the second connection structure 40 connected to the end of the middle first connection structure 31 is adjacent to the second connection structure 40 connected to the end of the adjacent middle first connection structure 31, and the distance S along the first direction X is 12 mm, and the distance S is greater than twice the pitch L between the first grid line 201 and the second grid line 202 of the solar cell 200. For this reason, the pitch between the lead wires connected to adjacent central first connection structures 31 is large, which avoids the risk of short circuits, and because the pitch between adjacent lead wires is large, meaning that adjacent lead wires do not come into contact with each other, there is no need to insulate them with an insulating material, which not only simplifies the process and improves processing efficiency, but also reduces the use of materials and reduces manufacturing costs.

Those skilled in the art will understand that the above embodiments are specific examples of realizing the present application, but that in practice various changes in form and details are possible without departing from the spirit and scope of the present application. Since anyone skilled in the art can make changes and modifications without departing from the spirit and scope of the present application, the scope of protection of the present application should be based on the scope limited by the claims.

Claims (11)

A battery module including a plurality of cell string sets;
a first connection structure and a second connection structure,
the cell string set includes cell strings spaced apart from one another along a first direction, the cell string set is made up of a plurality of the cell strings connected in a first electrical connection manner, the cell strings are made up of a plurality of solar cells connected in a first electrical connection manner, the solar cells have a first grid line of positive polarity and a second grid line of negative polarity provided on the same surface, and a pitch between the first grid line and the second grid line adjacent to each solar cell along the first direction is a pitch L;
the cell string set includes a first cell string set and a second cell string set, the first cell string set and the second cell string set are connected in a second electrical connection manner along a second direction, and the first direction is perpendicular to the second direction;
the first connection structure extends along a first direction, the first connection structure is connected to the cell string, the second connection structure extends along a second direction, the second connection structure is connected to the first grid line and the second grid line, and the second connection structure located at an end of the cell string is connected to the first connection structure, the first connection structure includes at least one middle first connection structure, the middle first connection structure is respectively connected to a cell string of the first cell string set and a cell string of the second cell string set, the second connection structure connected to an end of the middle first connection structure is adjacent to a second connection structure connected to an end of the adjacent middle first connection structure, and a distance S along the first direction is greater than the pitch L;
In the second direction, the second connection structure located above the central first connection structure faces the second connection structure located below the central first connection structure,
the first connection structure further includes an end first connection structure, the end first connection structure connects the other end of the cell string away from the middle first connection structure, the number of the solar cells in the cell string is an even number, along the first direction, a second connection structure connected to an end of the end first connection structure and a second connection structure connected to an end of the adjacent end first connection structure are adjacent to each other, and a distance along the first direction is N, and the distance N is less than twice the pitch L;
A photovoltaic module comprising: Along the second direction, a first grid line of a solar cell close to the middle first connection structure of the first cell string set is on an extension of a first grid line of a solar cell close to the middle first connection structure of the second cell string set, and a second grid line of a solar cell close to the middle first connection structure of the first cell string set is on an extension of a second grid line of a solar cell close to the middle first connection structure of the second cell string set.
2. The photovoltaic module of claim 1. 10. The photovoltaic module of claim 1 , wherein the solar cell is a split cell, and the solar cell has an even number of grid lines. 2. The photovoltaic module of claim 1 , wherein the solar cell is a back-junction type cell. a second connection structure connected to an end of the central first connection structure and a second connection structure connected to an end of an adjacent central first connection structure are adjacent to each other, and a distance S along the first direction is greater than twice the pitch L;
2. The photovoltaic module of claim 1. the pitch L is in the range of 3.5 mm to 20 mm, and/or the second connection structure connected to the end of the central first connection structure and the second connection structure connected to the end of the adjacent central first connection structure are adjacent to each other, and the distance S along the first direction is in the range of 8 mm to 50 mm;
2. The photovoltaic module of claim 1 . the cell string set includes a first cell string and an adjacent second cell string, and grid lines of edges of solar cells on the first cell string are adjacent to grid lines of edges of solar cells on the second cell string and are of opposite conductivity type;
2. The photovoltaic module of claim 1. Providing an initial battery;
forming a battery module, a plurality of solar cells being connected to form cell strings in a first electrical connection manner through a second connection structure, the plurality of cell strings being connected to form a cell string set in the first electrical connection manner, the cell strings being spaced apart along a first direction, the plurality of cell string sets constituting the battery module, the solar cells having first grid lines of positive polarity and second grid lines of negative polarity arranged on the same surface, a pitch between the first grid lines and the second grid lines adjacent to each solar cell along the first direction is pitch L, the cell string sets include a first cell string set and a second cell string set, the first cell string set and the second cell string set being connected to each other in a second direction in a second electrical connection manner, the first direction being perpendicular to the second direction;
forming a first connection structure and a second connection structure, the first connection structure extending along a first direction, the first connection structure being connected to the cell string, the second connection structure extending along a second direction, the second connection structure being connected to the first grid line and the second grid line, the first connection structure including at least one middle first connection structure, the middle first connection structure being connected to a cell string of the first cell string set and a cell string of a second cell string set, respectively, the second connection structure of a solar cell located at an end of the cell string being connected to the middle first connection structure, a second connection structure connected to an end of the middle first connection structure and a second connection structure connected to an end of an adjacent middle first connection structure are adjacent to each other, and a distance along the first direction is S, the distance S being greater than the pitch L, and in the second direction, a second connection structure located above the middle first connection structure faces a second connection structure located below the middle first connection structure,
the first connection structure further includes an end first connection structure, the end first connection structure connects the other end of the cell string away from the middle first connection structure, the number of the solar cells in the cell string is an even number, along the first direction, a second connection structure connected to an end of the end first connection structure and a second connection structure connected to an end of the adjacent end first connection structure are adjacent to each other, and a distance along the first direction is N, and the distance N is less than twice the pitch L;
A method for producing a photovoltaic module comprising the steps of: When the number of solar cells in the cell string is an even number, the step of forming the first cell string set and the second cell string set includes forming a third cell string and a fourth cell string, forming the first cell string set and the second cell string set, and arranging a plurality of the third cell strings and the third cell string rotated by 180 degrees at a distance from each other along the first direction to form the first cell string set, and arranging a plurality of the fourth cell strings and the fourth cell string rotated by 180 degrees at a distance from each other to form the second cell string set.
The method for manufacturing a photovoltaic module according to claim 8 . The solar cell includes a first battery cell and a second battery cell, the initial battery is divided to form the first battery cell and the second battery cell, and the first battery cell and the second battery cell are symmetrical along a cut line of the initial battery. A third cell string or a fifth cell string is configured by arranging the first battery cell and the second battery cell rotated by 180 degrees at a distance along the second direction, and a fourth cell string or a sixth cell string is configured by arranging the second battery cell and the first battery cell rotated by 180 degrees at a distance along the second direction.
The method for manufacturing a photovoltaic module according to claim 9 . The step of forming a second connection structure further includes: the second connection structure is respectively connected to a first grid line having a first conductivity type in the first battery cell and a second grid line having a second conductivity type opposite to the first grid line in the second battery cell; or the second connection structure is respectively connected to a second grid line having a second conductivity type in the first battery cell and a first grid line having a first conductivity type opposite to the first grid line in the second battery cell.
The method for manufacturing a photovoltaic module according to claim 10 .