Photovoltaic module

Abstract

At least some embodiments of the present disclosure provide a photovoltaic module, which includes at least one battery string. The at least one battery string includes a plurality of battery cells connected in series. The plurality of battery cells includes right-angled battery cells and non-right-angled battery cells. The right-angled battery cells have a first main grid electrode and a second main grid electrode extending in a first direction, and the non-right-angled battery cells have a third main grid electrode and a fourth main grid electrode extending in the first direction. The first main grid electrode of one of the adjacent right-angled battery cells overlaps and is connected and lapped with the second main grid electrode of the other of the adjacent right-angled battery cells. The third main grid electrode of the non-right-angled battery cell among the adjacent right-angled battery cell and non-right-angled battery cell overlaps and is connected and lapped with the second main grid electrode of the right-angled battery cell among the adjacent right-angled battery cell and non-right-angled battery cell.

Description

Technical Field

[0001] The present disclosure relates to a photovoltaic module. Background Art

[0002] Photovoltaic modules with small gaps or even no gaps are one of the important development directions of future high-efficiency photovoltaic modules. Their significant feature is that the distance between adjacent cells inside the cell string is reduced or eliminated, and the edges of adjacent cells can even overlap each other to form a conductive path.

[0003] The "shingled connection method" refers to a connection method in which the back main grid electrode of one cell is lapped on the front main grid electrode of an adjacent cell to serially connect multiple cells to form a cell string. Among them, the two adjacent cells overlap each other in the thickness direction of the photovoltaic module. For example, the cells can be divided cells obtained by cutting a whole cell. For example, instead of using solder ribbons, conductive materials such as conductive adhesives can be used to electrically connect the back main grid electrode of one cell to the front main grid electrode of another cell. The "shingled connection method" has been increasingly applied in the production of high-efficiency photovoltaic modules.

[0004] Generally, a whole cell is cut into multiple divided cells (for example, 1 / 2 divided cells, 1 / 3 divided cells, 1 / 4 divided cells, 1 / 5 divided cells, 1 / 6 divided cells, etc.). However, due to considerations such as production cost and process, the multiple divided cells obtained by cutting include right-angled cells and non-right-angled cells.

[0005] The common practice for shingled modules is: after cutting the whole cell, the right-angled cells are separately made into cell strings and modules, and the remaining non-right-angled cells are made into cell strings and modules. Since it is necessary to distinguish between right-angled cells and non-right-angled cells, this solution increases the complexity of production equipment, increases the process difficulty, and in addition, it is difficult to perform effective process iteration and upgrade. Summary of the Invention

[0006] At least some embodiments of the present disclosure provide a photovoltaic module, which includes at least one battery string. The at least one battery string includes a plurality of solar cells connected in series in a shingled connection manner. The plurality of solar cells includes right-angled solar cells and non-right-angled solar cells. The right-angled solar cells have a first main grid electrode and a second main grid electrode disposed on opposite sides of the right-angled solar cell and extending in a first direction. The non-right-angled solar cells have a third main grid electrode and a fourth main grid electrode disposed on opposite sides of the non-right-angled solar cell and extending in the first direction. The non-right-angled solar cells include a first edge adjacent to the non-right angle and extending in the first direction and a second edge not adjacent to the non-right angle and extending in the first direction. The first edge and the second edge are opposite to each other. The third main grid electrode is disposed close to the first edge, and the fourth main grid electrode is disposed close to the second edge. The first main grid electrode of one of at least a pair of adjacent right-angled solar cells overlaps with the second main grid electrode of the other of the at least a pair of right-angled solar cells. The third main grid electrode of the non-right-angled solar cell in at least a pair of adjacent right-angled solar cells and non-right-angled solar cells overlaps with the second main grid electrode of the right-angled solar cell in the at least a pair of right-angled solar cells and non-right-angled solar cells.

[0007] Therefore, the photovoltaic module according to the embodiments of the present disclosure includes right-angled solar cells and non-right-angled solar cells connected in series in a shingled connection manner. There is no need to distinguish and screen right-angled solar cells and non-right-angled solar cells, but to adapt and connect the non-right-angled solar cells in series with the right-angled solar cells, which reduces the complexity of production equipment and helps effective process iteration and upgrade.

[0008] For example, in some embodiments, the widths of the first main grid electrode and the third main grid electrode in a second direction perpendicular to the first direction are equal and greater than the widths of the second main grid electrode and the fourth main grid electrode in the second direction, and the widths of the second main grid electrode and the fourth main grid electrode are equal.

[0009] Since the widths of the main grid electrodes on one side (e.g., the back or the front) of the right-angled solar cells and the non-right-angled solar cells are set to be greater than the widths of the main grid electrodes on the other side (e.g., the front or the back), therefore, regardless of whether it is a right-angled solar cell or a non-right-angled solar cell, the positions of the back main grid electrodes and the front main grid electrodes of adjacent solar cells can be configured to overlap with each other, so as to be connected in series in a shingled connection manner. In addition, at least there is no need to widen the widths of the main grid electrodes on the other side, which helps to reduce the material cost of the main grid electrodes on the other side and improve the power generation efficiency of the photovoltaic module. The widths of the first main grid electrode and the third main grid electrode are equal, and the widths of the second main grid electrode and the fourth main grid electrode are equal, which helps to simplify the production process for forming each back main grid and each front main grid.

[0010] For example, in some embodiments, the widths of the second main grid electrode and the fourth main grid electrode are in the range of 0.4-0.6 mm.

[0011] For example, in some embodiments, the widths of the first main grid electrode and the third main grid electrode are in the range of 0.8 - 1.0 mm.

[0012] For example, in some embodiments, the overlapping width of the at least one pair of right-angled cell pieces in the second direction is less than or equal to the overlapping width of the at least one pair of right-angled cell pieces and non-right-angled cell pieces in the second direction.

[0013] Setting the overlapping width of adjacent right-angled cell pieces to be equal to the overlapping width of adjacent right-angled cell pieces and non-right-angled cell pieces helps to make the processing of the cell pieces more adaptable to existing production machinery.

[0014] Setting the overlapping width of adjacent right-angled cell pieces to be less than the overlapping width of adjacent right-angled cell pieces and non-right-angled cell pieces helps to reduce the overlapping width of adjacent right-angled cell pieces, thereby increasing the amount of light that the right-angled cell pieces can receive and improving the power generation efficiency of the right-angled cell pieces.

[0015] For example, in some embodiments, the widths of the first main grid electrode, the third main grid electrode, the second main grid electrode, and the fourth main grid electrode in the second direction perpendicular to the first direction are equal. And, the overlapping width of the at least one pair of right-angled cell pieces in the second direction is less than the overlapping width of the at least one pair of right-angled cell pieces and non-right-angled cell pieces in the second direction.

[0016] Since the overlapping width of adjacent right-angled cell pieces is set to be less than the overlapping width of adjacent right-angled cell pieces and non-right-angled cell pieces, therefore, whether it is a right-angled cell piece or a non-right-angled cell piece, the positions of the back main grid electrode and the front main grid electrode of adjacent cell pieces can be configured to overlap each other, so as to be connected in series in a shingled connection manner. In addition, in this case, the area of the right-angled cell pieces and non-right-angled cell pieces blocked by each main grid electrode, that is, the width of each main grid electrode, can also be set to be very small.

[0017] For example, in some embodiments, the widths of the first main grid electrode, the third main grid electrode, the second main grid electrode, and the fourth main grid electrode are in the range of 0.4 - 0.6 mm.

[0018] For example, in some embodiments, the plurality of cell pieces further includes a connecting cell piece, and the connecting cell piece includes a fifth main grid electrode and a sixth main grid electrode that extend in the first direction and are disposed on opposite sides of the connecting cell piece, and an additional back main grid electrode disposed on the back of the connecting cell piece. The connecting cell piece can be a right-angled cell piece or a non-right-angled cell piece.

[0019] The additional backside main grid electrodes can be connected to a current lead-out member (such as a welding rod) for, for example, parallel connection between individual cell strings. The additional backside main grid electrodes allow the current lead-out member to be disposed on the backside of the photovoltaic module, thereby saving space, increasing the effective front-side power generation area of the photovoltaic module, and contributing to improving the aesthetics of the photovoltaic module.

[0020] For example, in some embodiments, the additional backside main grid electrodes include a plurality of electrode blocks arranged at intervals in a first direction.

[0021] For example, in some embodiments, the plurality of electrode blocks are in contact with and conductively connected to the main grid electrode among the fifth main grid electrode and the sixth main grid electrode that is disposed on the backside of the connected cell.

[0022] Arranging the plurality of electrode blocks to be in contact with and conductively connected to the fifth main grid electrode or the sixth main grid electrode helps to reduce the line loss inside the module and improve the power generation efficiency of the module.

[0023] For example, in some embodiments, the connected cell includes an aluminum back surface field disposed on its backside, and the aluminum back surface field extends in the first direction and is in contact with and electrically connected to the plurality of electrode blocks.

[0024] The aluminum back surface field can electrically connect and thermally connect the plurality of electrode blocks of the additional backside main grid electrodes, which helps to improve the conductive efficiency of the additional backside main grid electrodes and helps to better dissipate the heat generated at the electrical connection point between the additional backside main grid electrodes and the current lead-out member, avoiding local overheating.

[0025] For example, in some embodiments, the surface of the additional backside main grid electrodes has uneven patterns for increasing the roughness of the surface.

[0026] The additional backside main grid electrodes having a high surface roughness can be connected to the current lead-out member more firmly and easily.

[0027] For example, in some embodiments, at least one cell string includes a plurality of cell strings, and the plurality of cells of the plurality of cell strings are arranged in an array, and the additional backside main grid electrodes of the connected cells of the plurality of cell strings adjacent to each other in a second direction are electrically connected through a current lead-out member.

[0028] For example, in some embodiments, the distance from the first main grid electrode to the edge of the right-angled cell is less than the distance from the third main grid electrode to the first edge of the non-right-angled cell.

[0029] For example, in some embodiments, the non-right-angled cell includes a first edge with a chamfer extending in the first direction and a second edge without a chamfer extending in the first direction, the first edge and the second edge are opposite to each other, the third main grid electrode is disposed close to the first edge, and the fourth main grid electrode is disposed close to the second edge.

[0030] For example, in some embodiments, the first main grid electrode is disposed on the back surface of the right-angled cell, the second main grid electrode is disposed on the front surface of the right-angled cell, the third main grid electrode is disposed on the back surface of the non-right-angled cell, and the fourth main grid electrode is disposed on the front surface of the non-right-angled cell.

[0031] Therefore, according to the present disclosure, the following technical solutions are provided:

[0032] Solution 1. A photovoltaic module, comprising:

[0033] At least one battery string, which includes a plurality of cells connected in series in an overlapping connection manner,

[0034] The plurality of cells include right-angled cells and non-right-angled cells,

[0035] The right-angled cell has a first main grid electrode and a second main grid electrode disposed on opposite sides of the right-angled cell and extending in a first direction, and the non-right-angled cell has a third main grid electrode and a fourth main grid electrode disposed on opposite sides of the non-right-angled cell and extending in the first direction,

[0036] The non-right-angled cell includes a first edge adjacent to the non-right angle and extending in the first direction and a second edge not adjacent to the non-right angle and extending in the first direction, the first edge and the second edge are opposite to each other, the third main grid electrode is disposed close to the first edge, and the fourth main grid electrode is disposed close to the second edge,

[0037] The first main grid electrode of one of at least a pair of adjacent right-angled cells overlaps with the second main grid electrode of the other of the at least a pair of right-angled cells,

[0038] The third main grid electrode of the non-right-angled cell in at least a pair of adjacent right-angled cells and non-right-angled cells overlaps with the second main grid electrode of the right-angled cell in the at least a pair of right-angled cells and non-right-angled cells.

[0039] Solution 2. The photovoltaic module according to Solution 1, wherein the right-angled cell and the non-right-angled cell are formed by scribing a whole cell.

[0040] Solution 3. The photovoltaic module according to Solution 1 or 2, wherein

[0041] The first main grid electrode and the third main grid electrode have equal widths in a second direction perpendicular to the first direction and are greater than the widths of the second main grid electrode and the fourth main grid electrode in the second direction, and the second main grid electrode and the fourth main grid electrode have equal widths.

[0042] Solution 4. The photovoltaic module according to any one of Solutions 1-3, wherein,

[0043] The widths of the second main grid electrode and the fourth main grid electrode are in the range of 0.4-0.6 mm.

[0044] Solution 5. The photovoltaic module according to any one of Solutions 1-4, wherein,

[0045] The widths of the first main grid electrode and the third main grid electrode are in the range of 0.8-1.0 mm.

[0046] Solution 6. The photovoltaic module according to any one of Solutions 1-5, wherein,

[0047] The overlapping width of the at least one pair of right-angled solar cells in the second direction is less than or equal to the overlapping width of the at least one pair of right-angled solar cells and non-right-angled solar cells in the second direction.

[0048] Solution 7. The photovoltaic module according to Solution 1 or 2, wherein,

[0049] The widths of the first main grid electrode, the third main grid electrode, the second main grid electrode and the fourth main grid electrode in a second direction perpendicular to the first direction are equal, and

[0050] The overlapping width of the at least one pair of right-angled solar cells in the second direction is less than the overlapping width of the at least one pair of right-angled solar cells and non-right-angled solar cells in the second direction.

[0051] Solution 8. The photovoltaic module according to Solution 7, wherein,

[0052] The widths of the first main grid electrode, the third main grid electrode, the second main grid electrode and the fourth main grid electrode are in the range of 0.4-0.6 mm.

[0053] Solution 9. The photovoltaic module according to any one of Solutions 1-8, wherein,

[0054] The plurality of solar cells further includes connecting solar cells, and the connecting solar cells include a fifth main grid electrode and a sixth main grid electrode that extend in the first direction and are disposed on opposite sides of the connecting solar cells, and an additional back main grid electrode disposed on the back surface of the connecting solar cells. The connecting solar cells are right-angled solar cells or non-right-angled solar cells.

[0055] Solution 10. The photovoltaic module according to Solution 9, wherein,

[0056] The additional back main grid electrode includes a plurality of electrode blocks arranged at intervals in the first direction.

[0057] Solution 11. The photovoltaic module according to Solution 10, wherein,

[0058] The plurality of electrode blocks are in contact with and conductively connected to the main grid electrode disposed on the back surface of the connected cell among the fifth main grid electrode and the sixth main grid electrode.

[0059] Solution 12. The photovoltaic module according to Solution 10, wherein,

[0060] The connected cell includes an aluminum back surface field disposed on its back surface, and the aluminum back surface field extends in the first direction and is in contact with and electrically connected to the plurality of electrode blocks.

[0061] Solution 13. The photovoltaic module according to any one of Solutions 9 - 12, wherein,

[0062] The surface of the additional back main grid electrode has a concavo-convex pattern for increasing the roughness of the surface.

[0063] Solution 14. The photovoltaic module according to any one of Solutions 9 - 13, wherein,

[0064] The at least one cell string includes a plurality of cell strings, the plurality of cells of the plurality of cell strings are arranged in an array, and the additional back main grid electrodes of the connected cells of the plurality of cell strings adjacent to each other in the second direction are electrically connected through current lead-out members.

[0065] Solution 15. The photovoltaic module according to any one of Solutions 1 - 14, wherein,

[0066] The distance from the first main grid electrode to the edge of the right-angled cell is less than the distance from the third main grid electrode to the first edge of the non-right-angled cell.

[0067] Solution 16. The photovoltaic module according to any one of Solutions 1 - 15, wherein,

[0068] The first main grid electrode is disposed on the back surface of the right-angled cell, the second main grid electrode is disposed on the front surface of the right-angled cell, the third main grid electrode is disposed on the back surface of the non-right-angled cell, and the fourth main grid electrode is disposed on the front surface of the non-right-angled cell.

[0069] Solution 17. A monolithic photovoltaic cell, including a front surface and a back surface opposite to the front surface, wherein the monolithic photovoltaic cell can be split into a plurality of segmented cells, and the plurality of segmented cells include right-angled cells, non-right-angled cells and connected cells, which are overlapped with each other to form a photovoltaic module;

[0070] Among them, each of the right-angled cell pieces has a first main grid electrode disposed on one of the front and back surfaces of the right-angled cell piece and extending in a first direction, and a second main grid electrode disposed on the other of the front and back surfaces of the right-angled cell piece and extending in the first direction. The non-right-angled cell piece has a third main grid electrode disposed on one of the front and back surfaces of the non-right-angled cell piece and extending in the first direction, and a fourth main grid electrode disposed on the other of the front and back surfaces of the non-right-angled cell piece and extending in the first direction.

[0071] The non-right-angled cell piece includes a first edge adjacent to the non-right angle and extending in the first direction and a second edge not adjacent to the non-right angle and extending in the first direction. The first edge is opposite to the second edge. The third main grid electrode is disposed close to the first edge, and the fourth main grid electrode is disposed close to the second edge.

[0072] The connecting cell piece includes a fifth main grid electrode extending in the first direction and disposed on one of the front and back surfaces of the connecting cell piece, a sixth main grid electrode disposed on the other of the front and back surfaces of the connecting cell piece, and an additional back main grid electrode disposed on the back surface of the connecting cell piece.

[0073] Solution 18. The whole-piece photovoltaic cell piece according to Solution 17, wherein the widths of the first main grid electrode and the third main grid electrode in a second direction perpendicular to the first direction are equal and greater than the widths of the second main grid electrode and the fourth main grid electrode in the second direction, and the widths of the second main grid electrode and the fourth main grid electrode are equal.

[0074] Solution 19. The whole-piece photovoltaic cell piece according to Solution 18, wherein the widths of the first main grid electrode and the third main grid electrode are in the range of 0.8 mm to 1.0 mm, and / or the widths of the second main grid electrode and the fourth main grid electrode are in the range of 0.4 mm to 0.6 mm.

[0075] Solution 20. The whole-piece photovoltaic cell piece according to Solution 17, wherein the distance between the third main grid electrode and the first edge is greater than the distance between the fourth main grid electrode and the second edge.

[0076] Solution 21. A manufacturing method of a photovoltaic module, comprising:

[0077] Fragmenting the whole-piece photovoltaic cell piece according to any one of Solutions 17 to 20 into a plurality of segmented cell pieces including at least one right-angled cell piece, at least one non-right-angled cell piece, and at least one connecting cell piece;

[0078] Lapping the plurality of segmented cell pieces to form a photovoltaic module.

[0079] The overlapping of the plurality of segmented solar cells includes overlapping a first main grid electrode of one of at least one pair of right-angle solar cells adjacent to each other with a second main grid electrode of the other of the at least one pair of right-angle solar cells,

[0080] The third main grid electrode of the non-right-angled cell in at least one pair of right-angled cells and non-right-angled cells adjacent to each other overlaps the second main grid electrode of the right-angled cell in the at least one pair of right-angled cells and non-right-angled cells.

[0081] The first main grid electrode or the second main grid electrode of the right-angle cell in at least one pair of right-angle cells adjacent to each other and the connecting cell is overlapped with the sixth main grid electrode or the fifth main grid electrode of the connecting cell.

[0082] Option 22. The manufacturing method as described in Option 21 further includes: electrically connecting the additional back main grid electrodes of the connected battery cells adjacent to each other in the second direction through a current conducting member. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0084] Figure 1 A schematic diagram showing the back side of a whole battery cell according to an embodiment of the present disclosure is shown;

[0085] Figure 2 Shown along Figure 1 A schematic cross-sectional view taken along line AA in FIG.

[0086] Figure 3 Shown along Figure 1 A schematic cross-sectional view taken along line BB in FIG.

[0087] Figure 4 Shows Figure 1 A cross-sectional schematic diagram of two first battery cells connected by a shingled connection method;

[0088] Figure 5 Shows Figure 1 A cross-sectional schematic diagram of a first battery cell and a second battery cell connected by a shingled connection method;

[0089] Figure 6 A cross-sectional schematic diagram showing two first battery cells connected by a shingled connection method according to another embodiment of the present disclosure is shown;

[0090] Figure 7 shows a schematic diagram of a photovoltaic module made of a whole solar cell in Figure 1 ;

[0091] Figure 8 shows Figure 7 a partial enlarged view of the circled part in

[0092] Figure 9 shows Figure 7 a schematic diagram of the electrical connection of the solar cells of the photovoltaic module in

[0093] Figure 10 shows a schematic diagram of the back of a whole solar cell according to another embodiment of the present disclosure;

[0094] Figure 11 shows Figure 10 a partial enlarged view of the circled part in

[0095] Figure 12 shows Figure 10 a cross-sectional schematic diagram of the connection of two first solar cells by the shingling connection method in

[0096] Figure 13 shows Figure 10 a cross-sectional schematic diagram of the connection of the first solar cell and the second solar cell by the shingling connection method in

[0097] Figure 14 shows a schematic diagram of a photovoltaic module made of a whole solar cell in Figure 10 ;

[0098] Figure 15 shows a schematic diagram of the back of a whole solar cell according to another embodiment of the present disclosure;

[0099] Figure 16 shows a schematic diagram of a photovoltaic module made of a whole solar cell in Figure 15 ; Detailed Embodiments

[0100] Next, a photovoltaic module according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. To make the objectives, technical solutions, and advantages of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure.

[0101] Accordingly, the following detailed description of the embodiments of the present disclosure provided in conjunction with the accompanying drawings is not intended to limit the scope of the claimed present disclosure, but merely represents selected embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0102] Photovoltaic modules are generally plate-shaped or sheet-shaped, extending substantially in a plane and having a certain thickness. For the convenience and clear description of the photovoltaic module according to the present disclosure, the direction perpendicular to the plane in which the photovoltaic module extends is defined as the "thickness direction". In addition, in the description herein and the appended claims, a "right-angled cell" is defined as a cell having a regular rectangular shape, and a "non-right-angled cell" is defined as a cell not having a regular rectangular shape, that is, a cell having a non-right angle, such as including a "chamfered cell", which is a generally rectangular cell having a chamfer at at least one corner.

[0103] In a shingled module, the cells adjacent to each other in a cell string are connected by a shingled connection method. The "shingled connection method" is defined as a connection method in which the back main grid electrode of one cell is overlapped on the front main grid electrode of an adjacent other cell in the thickness direction of the photovoltaic module. Due to notches such as chamfers, the distance between the main grid electrode on one side (back or front) of a non-right-angled cell and the edge of the cell (i.e., the edge of the cell close to the main grid electrode) is greater than the distance between the main grid electrode on the same side of a right-angled cell and the edge of the cell. Therefore, when a right-angled cell and a non-right-angled cell are overlapped, the main grid electrodes of the right-angled cell and the non-right-angled cell are not easily aligned, resulting in inability to connect or poor connection. Thus, as described above, the common practice in shingled modules is to separately fabricate right-angled segmented cells into cell strings and modules, and fabricate the remaining non-right-angled segmented cells into cell strings and modules.

[0104] At least some embodiments of the present disclosure provide a photovoltaic module, which includes at least one cell string. The at least one cell string includes a plurality of solar cells connected in series in an overlapping connection manner. The plurality of solar cells includes right-angle solar cells and non-right-angle solar cells. The right-angle solar cells have a first main grid electrode and a second main grid electrode disposed on opposite sides (i.e., the front side and the back side) of the right-angle solar cells and extending in a first direction. The non-right-angle solar cells have a third main grid electrode and a fourth main grid electrode disposed on opposite sides (i.e., the front side and the back side) of the non-right-angle solar cells and extending in the first direction. The non-right-angle solar cells include a first edge adjacent to the non-right angle and extending in the first direction and a second edge not adjacent to the non-right angle and extending in the first direction. The first edge is opposite to the second edge. The third main grid electrode is disposed close to the first edge, and the fourth main grid electrode is disposed close to the second edge. The first main grid electrode of one of at least a pair of adjacent right-angle solar cells overlaps with the second main grid electrode of the other of the at least a pair of adjacent right-angle solar cells. The third main grid electrode of the non-right-angle solar cell in at least a pair of adjacent right-angle solar cells and non-right-angle solar cells overlaps with the second main grid electrode of the right-angle solar cell in the at least a pair of adjacent right-angle solar cells and non-right-angle solar cells.

[0105] Therefore, the photovoltaic module according to the embodiments of the present disclosure has right-angle solar cells and non-right-angle solar cells connected in series in an overlapping connection manner. There is no need to distinguish and screen right-angle solar cells and non-right-angle solar cells, but to adapt the non-right-angle solar cells to the right-angle solar cells, which reduces the complexity of production equipment and helps effective process iteration and upgrade.

[0106] There is a cell string having right-angle solar cells and non-right-angle solar cells connected in series. In order to adapt the right-angle solar cells and non-right-angle solar cells, the corresponding front main grid electrodes and the corresponding back main grid electrodes of the right-angle solar cells and non-right-angle solar cells are both widened, and the overlapping distance between adjacent solar cells is also increased. For example, the width of the front main grid electrode and the back main grid electrode is greater than 1.0 mm, for example, in the range of 1.0 - 1.5 mm. In this way, the cost of the photovoltaic module becomes higher and the power generation efficiency is reduced, sacrificing the performance of the photovoltaic module.

[0107] In some embodiments of the present disclosure, the width of the back main grid electrode of the right-angled cell and the non-right-angled cell is set to be greater than the width of its front main grid electrode, or the width of the front main grid electrode of the right-angled cell and the non-right-angled cell is set to be greater than the width of its back main grid electrode. That is, only the width of the back main grid electrode is widened while keeping the width of the front main grid electrode small, or only the width of the front main grid electrode is widened while keeping the width of the back main grid electrode small. Since the width of the main grid electrode (the first main grid electrode and the third main grid electrode) on one side is widened, especially the main grid electrode (the first main grid electrode) on this side of the right-angled cell is extended in a direction away from the edge of the right-angled cell, therefore, for both the right-angled cell and the non-right-angled cell, the positions of the back main grid electrodes and the front main grid electrodes of adjacent cells can be configured to overlap each other, so as to be connected in series in a shingled connection manner. Since the width of the main grid electrode on the other side (the second main grid electrode and the fourth main grid electrode) is small, the material cost is reduced and the power generation efficiency loss of the photovoltaic module is reduced.

[0108] For example, the width of the second main grid electrode and the fourth main grid electrode can be in the range of 0.4 - 0.6 mm, and the width of the first main grid electrode and the third main grid electrode can be in the range of 0.8 - 1.0 mm.

[0109] In addition, in some embodiments of the present disclosure, the widths of the first main grid electrode, the third main grid electrode, the second main grid electrode, and the fourth main grid electrode in a second direction perpendicular to the first direction are equal. And the overlapping width of at least a pair of adjacent right-angled cells in the second direction is less than the overlapping width of an adjacent right-angled cell and a non-right-angled cell in the second direction.

[0110] Therefore, in this case, for both the right-angled cell and the non-right-angled cell, the positions of the back main grid electrodes and the front main grid electrodes of adjacent cells can be configured to overlap each other, so as to be connected in series in a shingled connection manner. In addition, in this case, the area of the right-angled cell and the non-right-angled cell blocked by each main grid electrode, that is, the width of each main grid electrode, can also be set to be very small, thereby improving the power generation efficiency.

[0111] For example, the widths of the second main grid electrode, the fourth main grid electrode, the first main grid electrode, and the third main grid electrode can be in the range of 0.4 - 0.6 mm.

[0112] Figure 1 FIG. shows a schematic diagram of the back of a whole cell according to an embodiment of the present disclosure (for clarity, components such as fine grids are omitted), Figure 2 FIG. shows along Figure 1 a cross-sectional schematic diagram taken along line A-A in Figure 3 FIG. shows along Figure 1The cross-sectional schematic view taken along line B-B in Figure 1 As shown, the entire solar cell can be a P-type square single-crystal solar cell with a small chamfer of 158.75 m, which can be cut into two non-rectangular solar cells with chamfers on both sides and three rectangular right-angle solar cells in the middle. For example, in order to make the areas of the individual solar cells and thus the short-circuit currents equal (differing by less than 2%), the width of the non-rectangular solar cells is set to be greater than the width of the right-angle solar cells, but this is not limited thereto.

[0113] As Figures 1-3 shown, the right-angle solar cell serves as the first solar cell 1, one of the non-rectangular solar cells serves as the second solar cell 2, and the other serves as the third solar cell 3, i.e., the connecting solar cell. The first solar cell 1 includes a first main grid electrode 11 on its back and a second main grid electrode 12 on its front. The second solar cell 2 includes a third main grid electrode 21 on its back and a fourth main grid electrode 22 on its front. The third solar cell 3 includes a fifth main grid electrode 31, an additional back main grid electrode 33 on its back, and a sixth main grid electrode 32 on its front. Each main grid electrode extends in the first direction ( Figure 1 the up-down direction in

[0114] The back of the solar cell is opposite to the front. The "front" can be defined as the side facing a light source such as the sun when the solar cell is assembled into a photovoltaic module, and the "back" can be defined as the side facing away from a light source such as the sun when the solar cell is assembled into a photovoltaic module. In the manufacturing process of the solar cell, an insulating film is coated on the front and back of the solar cell, and then the corresponding main grid electrodes are formed on the insulating film through steps such as coating a paste containing silver particles and drying. Among them, the main grid electrode on one side (front or back) of the non-rectangular solar cell is arranged close to the edge adjacent to the chamfer (non-rectangle) of the non-rectangular solar cell. The main grid electrode is set at a certain distance from the edge of the solar cell to avoid a decrease in electrical performance. Compared with the distance between the main grid electrode of the right-angle solar cell and the corresponding edge of the right-angle solar cell (for example, within the range of 0 - 300 μm), the distance between the main grid electrode near the edge adjacent to the chamfer of the right-angle solar cell and the edge of the adjacent chamfer of the solar cell (for example, within the range of 300 - 600 μm) is greater.

[0115] In this embodiment, the third main grid electrode 21 is disposed near the first edge of the second solar cell 2 adjacent to the chamfer, and the fourth main grid electrode 22 is disposed near the second edge of the second solar cell 2 opposite to the first edge that is not adjacent to the chamfer. The fifth main grid electrode 31 is disposed near the edge of the third solar cell 3 adjacent to the chamfer, and the sixth main grid electrode 32 is disposed near the opposite edge of the third solar cell 3 that is not adjacent to the chamfer. Therefore, compared with the distance between the first main grid electrode 11 of the first solar cell 1, which is a right-angled solar cell, and the edge of the first solar cell 1, the distances between the third main grid electrode 21 of the second solar cell 2 and the fifth main grid electrode 31 of the third solar cell 3, which are non-right-angled solar cells, and the edges of the corresponding solar cells are greater.

[0116] In this embodiment, in order to better adapt the first solar cell 1, the second solar cell 2, and the third solar cell 3 to be connected in series to connect each solar cell, the front main grid electrodes (the second main grid electrode, the fourth main grid electrode, the sixth main grid electrode) and the back main grid electrodes (the first main grid electrode, the third main grid electrode, the fifth main grid electrode) of each solar cell are respectively set to have a first width and a second width greater than the first width in a second direction ( Figures 1-3 the left-right direction in ) perpendicular to the first direction. That is, each back main grid electrode, especially the first main grid electrode 11, is extended and widened in the direction away from the edge of the first solar cell 1. For example, the first width can be in the range of 0.4 - 0.6 mm, and the second width can be in the range of 0.8 - 1.0 mm.

[0117] For example, in one example, the widths of the second main grid electrode 12 and the fourth main grid electrode 22 are 0.5 mm, the widths of the first main grid electrode 11 and the third main grid electrode 21 are 1.0 mm, the distance between the first main grid electrode 11 and the edge of the first solar cell 1 is 0.25 mm, and the distance between the third main grid electrode 21 and the edge of the second solar cell 2 is 0.5 mm.

[0118] Figure 4 shows Figure 1 a cross-sectional schematic diagram of two first solar cells 1 connected by the overlapping connection method in. As Figure 4 shown, the second main grid electrode 12 of one first solar cell 1 is overlapped on the first main grid electrode 11 of another first solar cell 1.

[0119] Figure 5 shows Figure 1 a cross-sectional schematic diagram of the first solar cell 1 and the second solar cell 2 connected by the overlapping connection method in. As Figure 5 shown, the second main grid electrode 12 of the first solar cell 1 is overlapped on the third main grid electrode 21 of the second solar cell 2.

[0120] For example, two overlapping main grid electrodes can be connected to each other by a conductive adhesive (not shown).

[0121] From Figure 4 and Figure 5 It can be seen that since the first main grid electrode 11 and the third main grid electrode 21 are widened, both the first main grid electrode 11 of the first cell 1 as a right-angled cell and the third main grid electrode 21 of the second cell 2 as a non-right-angled cell can overlap with the second main grid electrode 12 of another first cell 1. Therefore, in this embodiment, the widened design of the back main grid electrodes of each cell can simplify the complexity of the cell design and assembly, allowing cells of different types (right-angled cells and non-right-angled cells) to be stacked and connected. In addition, the second main grid electrode 12 and the fourth main grid electrode 22 have a smaller second width, which is smaller than the first width of the first main grid electrode 11 and the third main grid electrode 21. Therefore, the second main grid electrode 12 and the fourth main grid electrode 22 with smaller widths save material costs (for example, the electrode material includes precious metal silver), reducing the manufacturing cost of the photovoltaic module. In addition, although a part of the front surface of the first cell 1 located in the upper part of the figure is blocked by the first cell 1 or the second cell 2 located in the lower part, light still obliquely enters the area not covered by the second main grid electrode 12 in the actual power generation environment. Therefore, the second main grid electrode 12 and the fourth main grid electrode 22 with smaller widths also help to improve the actual power generation efficiency of the cell and the photovoltaic module including it.

[0122] In addition, the fifth main grid electrode 31 of the third cell 3, which is also a non-right-angled cell like the second cell 2, can be Figure 5 connected to the second main grid electrode 11 of the first cell 1 similarly as shown.

[0123] In addition, the first main grid electrode 11 of the first cell 1 can be Figure 4 connected to the fourth main grid electrode 21 of the second cell 2 or the sixth main grid electrode 31 of the third cell 3 similarly as shown.

[0124] In addition, an additional back main grid electrode 33 can be provided on one first cell 1 to form another third cell 3, and such a third cell 3 is a right-angled cell.

[0125] In this embodiment, the widths of the first main grid electrodes 11 of the first solar cell 1, the third main grid electrodes 21 of the second solar cell 2, and the fifth main grid electrodes 31 of the third solar cell 3 are set to be equal. In addition, the widths of the second main grid electrodes 12 of the first solar cell 1, the fourth main grid electrodes 22 of the second solar cell 2, and the sixth main grid electrodes 32 of the third solar cell 3 are set to be equal. Therefore, when forming each back main grid electrode or each front main grid electrode, it is not necessary to distinguish different types of solar cells, which helps to simplify the processing flow and reduce the processing cost.

[0126] In addition, in Figure 4 and Figure 5 the shown embodiment, the overlapping width of two adjacent first solar cells 1 in the second direction is equal to the overlapping width of an adjacent first solar cell 1 and a second solar cell 2 in the second direction. Such equal overlapping widths help to adapt to existing processing machinery.

[0127] Figure 6 FIG. shows a cross-sectional schematic view of two first solar cells 1 connected by an overlapping connection method according to another embodiment of the present disclosure. As Figure 6 shown, in this embodiment, the overlapping width of the two first solar cells 1 is reduced and is less than the overlapping width of an adjacent first solar cell 1 and a second solar cell 2 in the second direction. Therefore, the area of the front surface of the upper first solar cell 1 blocked by the lower second solar cell 2 is reduced, further improving the power generation efficiency of the photovoltaic module.

[0128] It should be noted that, in the above embodiment, the first main grid electrode 11 and the second main grid electrode 12 are respectively arranged on the back surface and the front surface of the first solar cell 1, the third main grid electrode 21 and the fourth main grid electrode 22 are respectively arranged on the back surface and the front surface of the second solar cell 2, and the fifth main grid electrode 31 and the sixth main grid electrode 32 are respectively arranged on the back surface and the front surface of the third solar cell 3. However, in other embodiments, the first main grid electrode 11 and the second main grid electrode 12 can be respectively arranged on the front surface and the back surface of the first solar cell 1, the third main grid electrode 21 and the fourth main grid electrode 22 can be respectively arranged on the front surface and the back surface of the second solar cell 2, and the fifth main grid electrode 31 and the sixth main grid electrode 32 can be respectively arranged on the front surface and the back surface of the third solar cell 3. In this case, the front main grid electrodes can be widened.

[0129] Figure 7 FIG. shows a schematic diagram of a photovoltaic module made of a whole solar cell in Figure 1 , Figure 8 FIG. shows Figure 7 a partial enlarged view of the circled part in Figure 9 FIG., Figure 7 and FIG. shows a schematic diagram of the electrical connection of the solar cells of the photovoltaic module in

[0130] Using Figure 1 The small cell pieces obtained after splitting the whole cell piece shown are used to fabricate Figures 7-9 The steps of the photovoltaic module shown include:

[0131] S11, pre-cutting the whole cell into 5 split cell pieces, including 3 first cell pieces 1, 1 second cell piece, and 1 third cell piece 3, as Figure 1 shown;

[0132] S12, using methods such as screen printing to coat conductive glue at the corresponding back main grid electrodes (the first main grid electrode 11, the third main grid electrode 21, and the fifth main grid electrode 31) of the cell piece, and then splitting the cell piece to form 5 independent cell pieces;

[0133] S13, stacking the cell pieces on each other and connecting them in series in a laminating connection manner to form a total of 6 strings of cell pieces. Each string of cell pieces is connected in series with 56 cell pieces in total, which includes the first cell piece 1, the second cell piece 2, and the third cell piece 3. Among them, the 19th, 38th, and 56th cell pieces are selected as the third cell piece 3;

[0134] S14, laying a first encapsulation film on the front plate, and arranging the 6 strings of the above cell strings as Figure 7 and Figure 9 shown and laying them on the first encapsulation film;

[0135] S15, using a current lead-out member 4 to connect the front main grid electrode (negative electrode) of the first cell piece of each cell string;

[0136] S16, using a current lead-out member 4 to connect the additional back main grid electrodes 33 of the 19th, 38th, and 56th cell pieces in each cell string;

[0137] S17, setting electrode lead-out terminals, and laying a second encapsulation film and a back plate with a black coating, and performing operations such as EL testing, lamination, framing, and installing a junction box.

[0138] In the above step S12, splitting can also be performed first, and then conductive glue is coated. The coating method can be screen printing, pneumatic dispensing, etc. In addition, conductive glue can also be coated at the corresponding front main grid electrodes (the second main grid electrode 12, the fourth main grid electrode 22, and the sixth main grid electrode 32).

[0139] In the above step S13, the adjacent cell pieces are connected in series by heating and curing the conductive glue coated in step S12. The adjacent cell pieces can be laminated and connected, for example, as Figure 4 and Figure 5 shown.

[0140] In the above step S16, the additional back main grid electrode 33 is used to connect adjacent third cell wafers 3 in each cell string by means of the current lead-out member 4, so as to connect each cell string in parallel.

[0141] In the above steps S15 and S16, the current lead-out members 4 used may be the same or different.

[0142] The current lead-out member 4 may be a solder strip, which can be connected to the additional back main grid electrode 33 by means of welding or bonding with conductive glue, etc. In addition, a black coating may be provided on the current lead-out member 4 to reduce reflection and increase aesthetics.

[0143] For example, the additional back main grid electrode 33 may be a plurality of electrode blocks arranged at intervals in the first direction. In addition, in other examples, the additional back main grid electrode 33 may also be a continuous long strip. Compared with the continuous long-strip additional back main grid electrode 33, the plurality of electrode blocks arranged at intervals help to save material costs. As can be seen from the above manufacturing process, the additional back main grid electrode 33 of the third cell wafer 3 can be used to connect with the current lead-out member 4 so as to connect each cell string in parallel. Since the additional back main grid electrode 33 is arranged on the back of the third cell wafer 3, it saves space and increases the effective front-side power generation area of the photovoltaic module. In addition, it also helps to improve the aesthetics of the photovoltaic module. For example, a shingled module with a black front appearance can be finally manufactured.

[0144] It should be noted that the present disclosure is not limited to the third cell wafer having only one additional back main grid electrode 33, and it may have a plurality of additional back main grid electrodes 33.

[0145] Figure 10 FIG. shows a schematic diagram of the back of a whole cell wafer according to another embodiment of the present disclosure. As Figure 10 shown, the whole cell wafer may be a 158.75 mm P-type monocrystalline double-sided PERC cell wafer with small chamfers, which can be cut into two non-right-angled cell wafers with chamfers on both sides and three rectangular right-angled cell wafers in the middle. For example, in order to make the areas and thus the short-circuit currents of each cell wafer equal, the width of the non-right-angled cell wafer is set to be greater than the width of the right-angled cell wafer, but it is not limited thereto.

[0146] In this embodiment, two of the right-angled solar cells can be used as the first solar cell 1, the non-right-angled solar cells can all be used as the second solar cell 2, and the other of the right-angled solar cells can be used as the third solar cell 3, i.e., the connecting solar cell. The first solar cell 1 includes a first main grid electrode 11 on its back and a second main grid electrode 12 on its front. The second solar cell 2 includes a third main grid electrode 21 on its back and a fourth main grid electrode 22 on its front. The third solar cell 3 includes a fifth main grid electrode 31, an additional back main grid electrode 33 on its back and a sixth main grid electrode 32 on its front. Each main grid electrode extends in the first direction ( Figure 10 the up-down direction in

[0147] It should be noted that, in this embodiment, the first main grid electrode 11 and the second main grid electrode 12 are respectively arranged on the back and the front of the first solar cell 1, the third main grid electrode 21 and the fourth main grid electrode 22 are respectively arranged on the back and the front of the second solar cell 2, and the fifth main grid electrode 31 and the sixth main grid electrode 32 are respectively arranged on the back and the front of the third solar cell 3. However, in other embodiments, the first main grid electrode 11 and the second main grid electrode 12 can be respectively arranged on the front and the back of the first solar cell 1, the third main grid electrode 21 and the fourth main grid electrode 22 can be respectively arranged on the front and the back of the second solar cell 2, and the fifth main grid electrode 31 and the sixth main grid electrode 32 can be respectively arranged on the front and the back of the third solar cell 3.

[0148] In order to further reduce the material cost of the main grid electrode and reduce the area covered by the main grid electrode on each solar cell to improve the power generation efficiency of the photovoltaic module. In this embodiment, the front main grid electrode and the back main grid electrode of each solar cell are respectively arranged to have the same smaller width, for example, within the range of 0.4 - 0.6 mm.

[0149] Figure 12 Shows Figure 10 a cross-sectional schematic view of two first solar cells 1 connected by the shingling connection method in Figure 13 Shows Figure 10 a cross-sectional schematic view of the first solar cell 1 and the second solar cell 2 connected by the shingling connection method in Figure 12 As shown, the second main grid electrode 12 of one first solar cell 1 is lapped on the first main grid electrode 11 of another first solar cell 1. As shown in Figure 13 As shown, the second main grid electrode 12 of the first solar cell 1 is lapped on the third main grid electrode 21 of the second solar cell 2.

[0150] As Figure 12 and Figure 13 shown, the overlapping width of two adjacent first solar cells 1 in the second direction is less than the overlapping width of an adjacent first solar cell 1 and a second solar cell 2 in the second direction. Therefore, regardless of whether the solar cell is a right-angled solar cell or a non-right-angled solar cell, the positions of the back main grid electrodes and the front main grid electrodes of adjacent solar cells can be configured to overlap and connect with each other, so as to be connected in series in a shingled connection manner.

[0151] When performing shingled connection, the corresponding back main grid electrode and front main grid electrode can be identified (e.g., image recognition) and aligned by a processing machine, so as to overlap and connect the back main grid electrode and the front main grid electrode. For example, the widths of the first main grid electrode, the third main grid electrode, the second main grid electrode, and the fourth main grid electrode can be equal.

[0152] In addition, a third solar cell 3, which is also a right-angled solar cell, can be connected to Figure 12 the first solar cell 1 in a similar manner.

[0153] In addition, the first main grid electrode 11 of the first solar cell 1 or the fifth main grid electrode 31 of the third solar cell 3 can be connected to Figure 13 the fourth main grid electrode 22 of the second solar cell 2 in a similar manner.

[0154] In addition, the sixth main grid electrode 32 of the third solar cell 3, which is also a right-angled solar cell like the first solar cell 1, can be connected to Figure 13 the third main grid electrode 21 of the second solar cell 2 similarly as shown.

[0155] In addition, an additional back main grid electrode 33 can be provided on a second solar cell 2 to form another third solar cell 3, and such a third solar cell 3 is a non-right-angled solar cell.

[0156] Figure 11 Shows Figure 10 a partial enlarged view of the circled part in Figure 10 and Figure 11 shown, the additional back main grid electrode 33 includes a plurality of electrode blocks arranged at intervals in the first direction, and the third solar cell 3 further includes an aluminum back surface field 34 extending in the first direction provided on the back surface of the third solar cell 3. The aluminum back surface field 34 contacts and connects the plurality of electrode blocks.

[0157] Since the aluminum back surface field 34 can electrically connect and thermally connect the plurality of electrode blocks of the additional back main grid electrode 33, it helps to improve the conductive efficiency of the additional back main grid electrode 33, and helps to better dissipate the heat generated at the electrical connection point between the additional back main grid electrode 33 and the current lead-out member 4, avoiding local overheating.

[0158] For example, multiple electrode blocks for forming the additional back main grid electrode 33 may be first formed on the back surface of the third cell 3, and then a paste including aluminum particles is coated and the paste is dried to form an aluminum back surface field 34. The aluminum back surface field 34 partially covers the peripheries of the multiple electrode blocks and is electrically and thermally connected to the electrode blocks.

[0159] In addition, as Figure 11 shown, the surface of the additional back main grid electrode 33 has a concavo-convex pattern for increasing the roughness of the surface. The concavo-convex pattern is, for example, an array of circular protrusions, a wavy protrusion, etc. The additional back main grid electrode 33 having a high surface roughness can be more firmly and easily connected to the current lead-out member 4. For example, the current lead-out member 4 can be connected to the additional back main grid electrode 33 by welding or bonding with a conductive adhesive.

[0160] Figure 14 The schematic diagram of a photovoltaic module made of small cell pieces obtained by cleaving the whole cell piece shown in Figure 10 is shown. As Figure 14 shown, different from the embodiment in Figures 7-9 , a total of 10 strings of cell pieces are formed, and each string of cell pieces is connected in series with 34 cell pieces in total, which includes the first cell 1, the second cell 2, and the third cell 3. Among them, the 11th, 23rd, and 34th cell pieces are selected as the third cell 3.

[0161] Figure 15 The schematic diagram of the back surface of the whole cell piece according to another embodiment of the present disclosure is shown. As Figure 15 shown, the whole cell piece can be a 210 mm P-type cell piece, which can be cut into two non-right-angled cell pieces with chamfers on both sides and five rectangular right-angled cell pieces in the middle. For example, in order to make the areas of the respective cell pieces and thus the short-circuit currents equal, the width of the non-right-angled cell piece is set to be greater than the width of the right-angled cell piece, but it is not limited thereto.

[0162] The right-angled cell piece can be used as the first cell 1, one of the non-right-angled cell pieces can be used as the second cell 2, and the other non-right-angled cell piece can be used as the third cell 3, that is, the connecting cell piece. The first cell 1 includes a first main grid electrode 11 on its back surface and a second main grid electrode 12 on its front surface. The second cell 2 includes a third main grid electrode 21 on its back surface and a fourth main grid electrode 22 on its front surface. The third cell 3 includes a fifth main grid electrode 31, an additional back main grid electrode 33, and a sixth main grid electrode 32 on its front surface. Each main grid electrode is in the first direction ( Figure 15extends in the vertical direction (up and down direction) therein. The third main grid electrode 21 and the fifth main grid electrode 31 of the non-right-angle cell are arranged close to an edge adjacent to the chamfer. Compared with the first cell 1 which is a right-angle cell, the third main grid electrode 21 of the second cell 2 which is a non-right-angle cell and the fifth main grid electrode 31 of the third cell 3 are at a greater distance from the cell edge.

[0163] Two adjacent right-angle cells and an adjacent right-angle cell and non-right-angle cell can be, for example, Figure 4 and Figure 5 connected in the lamination connection manner shown, Figure 6 connected in the lamination connection manner shown, and Figure 12 and Figure 13 connected in the lamination connection manner shown.

[0164] Different from the embodiments shown in Figure 1 and Figure 10 in this embodiment, a plurality of electrode blocks arranged at intervals in the first direction of the additional back main grid electrode 33 can contact and be electrically connected to the fifth main grid electrode 31, which helps to reduce the line loss inside the component and improve the power generation efficiency of the component.

[0165] Figure 16 shows a schematic diagram of a photovoltaic module made of small cells obtained by splitting the whole cells in Figure 15 . As shown in Figure 16 , different from the embodiment in Figures 7-9 , a total of 8 strings of cells are formed, and each string of cells is connected in series with 35 cells in total, including the first cell 1, the second cell 2, and the third cell 3. Among them, the 12th, 24th, and 35th cells are selected as the third cell 3.

[0166] The scope of the present disclosure is not limited by the above-described embodiments, but is limited by the appended claims and their equivalent scope.

Claims

1. A photovoltaic module, comprising: At least one battery string, which includes a plurality of battery cells connected in series in an overlapping connection manner, The plurality of battery cells include right-angled battery cells and non-right-angled battery cells, The right-angled battery cell has a first main grid electrode provided on the back surface of the right-angled battery cell and a second main grid electrode provided on the front surface of the right-angled battery cell. The non-right-angled battery cell has a third main grid electrode provided on the back surface of the non-right-angled battery cell and a fourth main grid electrode provided on the front surface of the non-right-angled battery cell. The first main grid electrode, the second main grid electrode, the third main grid electrode, and the fourth main grid electrode extend in a first direction, The non-right-angled battery cell includes a first edge adjacent to the non-right angle and extending in the first direction and a second edge not adjacent to the non-right angle and extending in the first direction. The first edge is opposite to the second edge. The third main grid electrode is provided close to the first edge, and the fourth main grid electrode is provided close to the second edge, The widths of the first main grid electrode and the third main grid electrode in a second direction perpendicular to the first direction are equal and greater than the widths of the second main grid electrode and the fourth main grid electrode in the second direction. The widths of the second main grid electrode and the fourth main grid electrode are equal, The first main grid electrode of one of at least a pair of adjacent right-angled battery cells overlaps with the second main grid electrode of the other of the at least a pair of right-angled battery cells. The side surface of the first main grid electrode of a right-angled battery cell close to its second main grid electrode is flush with the side surface of the second main grid electrode of another right-angled battery cell far from its first main grid electrode, The third main grid electrode of the non-right-angled battery cell in at least a pair of adjacent right-angled battery cells and non-right-angled battery cells overlaps with the second main grid electrode of the right-angled battery cell in the at least a pair of right-angled battery cells and non-right-angled battery cells. The side surface of the second main grid electrode of the right-angled battery cell close to its first main grid electrode is flush with the side surface of the third main grid electrode of the non-right-angled battery cell far from its fourth main grid electrode line, Wherein, the overlapping width of a pair of right-angled battery cells in the second direction is less than the overlapping width of the right-angled battery cell and the non-right-angled battery cell in the second direction.

2. The photovoltaic module according to claim 1, wherein, The right-angled battery cell and the non-right-angled battery cell are formed by scribing a whole battery cell.

3. The photovoltaic module according to claim 1 or, wherein, The widths of the second main grid electrode and the fourth main grid electrode are in the range of 0.4 - 0.6 mm.

4. The photovoltaic module according to any one of claims 1 - 3, wherein, The widths of the first main grid electrode and the third main grid electrode are in the range of 0.8 - 1.0 mm.

5. The photovoltaic module according to claim 1, wherein, The plurality of battery cells further includes a connecting battery cell, and the connecting battery cell includes a fifth main grid electrode and a sixth main grid electrode extending in the first direction and provided on opposite side surfaces of the connecting battery cell, and an additional back main grid electrode provided on the back surface of the connecting battery cell. The connecting battery cell is a right-angled battery cell or a non-right-angled battery cell.

6. The photovoltaic module according to claim 5, wherein, The additional back main grid electrode includes a plurality of electrode blocks arranged at intervals in the first direction.

7. The photovoltaic module according to claim 6, wherein the plurality of electrode blocks are in contact with and electrically conductively connected to the main grid electrode disposed on the back surface of the connected cell among the fifth main grid electrode and the sixth main grid electrode.

8. The photovoltaic module according to claim 6, wherein the connected cell includes an aluminum back surface field disposed on its back surface, and the aluminum back surface field extends in the first direction and is in contact with and electrically connected to the plurality of electrode blocks.

9. The photovoltaic module according to any one of claims 5-8, wherein the surface of the additional back main grid electrode has a concavo-convex pattern for increasing the roughness of the surface.

10. The photovoltaic module according to any one of claims 5-8, wherein the at least one cell string includes a plurality of cell strings, and a plurality of cells of the plurality of cell strings are arranged in an array, and the additional back main grid electrodes of the connected cells adjacent to each other in the second direction of the plurality of cell strings are electrically connected through a current lead-out member.

11. The photovoltaic module according to any one of claims 1-3, wherein the distance from the first main grid electrode to the edge of the right-angled cell is less than the distance from the third main grid electrode to the first edge of the non-right-angled cell.

12. A method for manufacturing a photovoltaic module, comprising: dicing a whole photovoltaic cell into a plurality of diced cells including at least one right-angled cell, at least one non-right-angled cell, and at least one connected cell; overlapping the plurality of diced cells to form the photovoltaic module according to claim 1, wherein the right-angled cell has a first main grid electrode disposed on the back surface of the right-angled cell and a second main grid electrode disposed on the front surface of the right-angled cell, the non-right-angled cell has a third main grid electrode disposed on the back surface of the non-right-angled cell and a fourth main grid electrode disposed on the front surface of the non-right-angled cell, and the first main grid electrode, the second main grid electrode, the third main grid electrode, and the fourth main grid electrode extend in a first direction, the non-right-angled cell includes a first edge adjacent to the non-right angle extending in the first direction and a second edge not adjacent to the non-right angle extending in the first direction, the first edge and the second edge are opposite to each other, the third main grid electrode is disposed close to the first edge, and the fourth main grid electrode is disposed close to the second edge, the widths of the first main grid electrode and the third main grid electrode in a second direction perpendicular to the first direction are equal and greater than the widths of the second main grid electrode and the fourth main grid electrode in the second direction, and the widths of the second main grid electrode and the fourth main grid electrode are equal. The overlapping of the plurality of segmented solar cells includes overlapping the first main grid electrode of one of at least one pair of right-angle solar cells adjacent to each other with the second main grid electrode of the other of the at least one pair of right-angle solar cells, and the side of the first main grid electrode of one right-angle solar cell close to its second main grid electrode is flush with the side of the second main grid electrode of another right-angle solar cell away from its first main grid electrode, The third main grid electrode of the non-right-angle cell in at least one pair of right-angle cells and non-right-angle cells adjacent to each other overlaps with the second main grid electrode of the right-angle cell in the at least one pair of right-angle cells and non-right-angle cells, and the side of the second main grid electrode of the right-angle cell close to its first main grid electrode is flush with the side of the third main grid electrode of the non-right-angle cell away from its fourth main grid line, The first main grid electrode or the second main grid electrode of at least one pair of right-angle cells adjacent to each other and the connecting cell is overlapped with the sixth main grid electrode or the fifth main grid electrode of the connecting cell. An overlapping width of a pair of right-angled solar cells in the second direction is smaller than an overlapping width of a right-angled solar cell and a non-right-angled solar cell in the second direction.

13. The manufacturing method according to claim 12 further includes: The additional back main grid electrodes of the connected battery cells adjacent to each other in the second direction are electrically connected through the current conducting member.

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