Photovoltaic module

Abstract

The utility model discloses a photovoltaic assembly, which belongs to the photovoltaic field and comprises a plurality of battery string groups and a string connection structure connected with the plurality of battery string groups, each battery string group comprises a plurality of battery strings arranged at intervals along a first direction, each battery string comprises a plurality of battery pieces connected through a plurality of piece connection pieces, and the plurality of battery pieces are connected through a plurality of piece connection pieces. The battery piece comprises a plurality of electric components electrically connected with the piece connecting piece; the string connection structure comprises a plurality of string connection pieces, the piece connection pieces located at the ends of the battery strings are connected with the string connection pieces, and the piece connection piece connected with the leading-out end of each string connection piece is connected with the edge electric components in the battery pieces. According to the utility model, the distance between the leading-out end parts of the adjacent string connecting pieces is small, so that the size of the through hole on the back plate is small, water vapor is not easy to enter the photovoltaic assembly, and the sealing performance of the photovoltaic assembly is good.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] The photovoltaic module includes a battery string group, which is connected to a bus bar. The end of the bus bar is provided with a vertical lead-out section, and a through hole is provided on the back plate for the lead-out section to pass through. After passing through the through hole, the lead-out section is connected to a junction box.

[0003] At present, the distance between adjacent busbars is large, which leads to a large distance between adjacent lead-out sections, and a correspondingly large through hole needs to be opened on the back plate. However, when the through hole on the back plate is large, water vapor can easily enter the interior of the photovoltaic module, and the size of the junction box is also large. Utility Model Content

[0004] The utility model provides a photovoltaic component, aiming to at least solve the technical problems in the prior art that the spacing between adjacent bus bars is large and the through holes on the back plate are large.

[0005] The utility model provides a photovoltaic assembly, comprising a plurality of battery string groups and a string connection structure connected to the plurality of battery string groups, each of the battery string groups comprising a plurality of battery strings arranged at intervals along a first direction, the battery string comprising a plurality of battery sheets connected by a plurality of sheet connectors, the battery sheets comprising a plurality of electrical components electrically connected to the sheet connectors;

[0006] The string connection structure comprises a plurality of string connectors, the sheet connectors at the ends of the battery string are connected to the string connectors, and the sheet connectors connected to the lead-out ends of each string connector are connected to the edge electrical components in the battery sheet;

[0007] The plurality of electrical components include a first electrical component and a second electrical component of opposite conductivity types. Along the first direction, the distance between the center line of the adjacent first electrical component and the center line of the second electrical component is a first distance, and the distance between the sheet connectors connected by the lead ends of two adjacent series connectors is a second distance. The second distance is less than or equal to the first distance.

[0008] Optionally, the plurality of battery string groups include a first battery string group and a second battery string group, and the plurality of string connectors are located between the first battery string group and the second battery string group; the first battery string group includes a first battery string and a third battery string adjacent to the first battery string, and the first battery string and the third battery string are alternately distributed; the second battery string group includes a second battery string and a fourth battery string adjacent to the second battery string, and the second battery string and the fourth battery string are alternately distributed.

[0009] Optionally, the battery cells in the first battery string have a first right-angled side close to the third battery string, the battery cells in the third battery string have a third right-angled side close to the first battery string, and along the first direction, the distance between the first right-angled side and the third right-angled side is L3, the battery cells in the second battery string have a second right-angled side close to the fourth battery string, and the battery cells in the fourth battery string have a fourth right-angled side close to the second battery string, and along the first direction, the distance between the second right-angled side and the fourth right-angled side is L4, satisfying: the absolute value of the difference between L3 and L4 is less than or equal to a preset value.

[0010] Optionally, the preset value is 2 mm or 3 mm; and / or, L3 is less than or equal to 5 mm; and / or, L4 is less than or equal to 5 mm.

[0011] Optionally, along the first direction, adjacent sheet connectors electrically connected to the same series connector from both sides are arranged in a staggered manner.

[0012] Optionally, along the first direction, positions of adjacent sheet connectors electrically connected to the same series connector from both sides correspond to each other.

[0013] Optionally, the sheet connectors located at the ends of the battery string include an end sheet connector connecting the first battery string group and the string connection structure and a head end sheet connector connecting the second battery string group and the string connection structure.

[0014] Optionally, the end-piece connector includes a plurality of first end-piece connectors connecting the first battery string and the string connection structure and a plurality of second end-piece connectors connecting the third battery string and the string connection structure, and the head-end piece connector includes a plurality of first head-end piece connectors connecting the second battery string and the string connection structure and a plurality of second head-end piece connectors connecting the fourth battery string and the string connection structure.

[0015] Optionally, the electrical components connected to the first end piece connector and the second end piece connector have opposite conductivity types; and / or the electrical components connected to the first head end piece connector and the second head end piece connector have opposite conductivity types.

[0016] Optionally, the electrical components connected to the first end piece connector and the first head end piece connector have the same conductivity type; and / or the electrical components connected to the second end piece connector and the second head end piece connector have the same conductivity type.

[0017] Optionally, along the first direction, the conductivity types of two edge electrical components close to each other on two adjacent battery cells in two adjacent battery strings are the same or opposite.

[0018] Optionally, along the first direction, the distance between two adjacent first end piece connectors, the distance between two adjacent second end piece connectors, the distance between two adjacent first head end piece connectors, and the distance between two adjacent second head end piece connectors are all equal to twice the first distance.

[0019] Optionally, along the first direction, the distance between adjacent first end piece connectors and first head end piece connectors electrically connected on the same series connector from both sides is equal to the first distance; and / or, along the first direction, the distance between adjacent second end piece connectors and second head end piece connectors electrically connected on the same series connector from both sides is equal to the first distance.

[0020] Optionally, along the first direction, extension lines of adjacent sheet connectors electrically connected from both sides to the same series connector overlap; or, along the first direction, extension lines of adjacent sheet connectors electrically connected from both sides to the same series connector do not overlap, and along the first direction, the distance between adjacent sheet connectors electrically connected from both sides to the same series connector is less than 0.5 times the first distance.

[0021] Optionally, the multiple string connectors include a first string connector, a second string connector, a third string connector and a fourth string connector arranged in sequence, and the multiple first battery strings and the second battery strings are connected to at least one of the multiple string connectors through the sheet connector, and the multiple third battery strings and the fourth battery strings are connected to at least one of the multiple string connectors through the sheet connector.

[0022] Optionally, the plurality of battery cells include a plurality of first battery cells and second battery cells arranged in sequence, the first battery cells are rotationally symmetrical with the second battery cells; and / or, the battery cells have a right-angle portion, and the right-angle portions of at least two adjacent battery cells in each battery string are adjacent; and / or, the battery cells have a chamfered portion, and the chamfered portions of at least two adjacent battery cells in each battery string are adjacent.

[0023] Optionally, the sheet connector connects the first electrical component and / or the second electrical component; and / or the battery cell has at least one chamfered portion, and the positive projection of the sheet connector on the battery cell does not overlap with the chamfered portion; and / or the battery cell is a back-contact battery cell; and / or the first electrical component is a main grid line or a pad and the second electrical component is a main grid line or a pad; and / or the number of battery cells in each of the battery strings is an odd number or an even number.

[0024] In the present invention, the sheet connector connected to the lead-out end of each series connector is connected to the edge electrical component in the battery cell, and the distance between the edge electrical components in two adjacent battery cells along the first direction is small. In addition, the distance between the sheet connectors connected to the lead-out ends of two adjacent series connectors is less than or equal to the distance between the center line of the adjacent first electrical component and the center line of the second electrical component, thereby making the distance between the lead-out ends of adjacent series connectors small, and further making the size of the through hole on the back plate small, making it difficult for water vapor to enter the interior of the photovoltaic module, the sealing performance of the photovoltaic module is good, and the size of the junction box can also be set small. In addition, the positive projection of the sheet connector on the battery cell does not overlap with the chamfered portion, thereby avoiding the risk of the chamfered portion breaking due to the sheet connector crossing over the chamfered portion.

[0025] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 1 of the present utility model;

[0027] Figure 2 A schematic diagram of the structure of a photovoltaic module provided in the second embodiment of the present utility model;

[0028] Figure 3 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 3 of the present utility model;

[0029] Figure 4 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 4 of the present utility model;

[0030] Figure 5 for Figure 4 Schematic diagram of the local structure in;

[0031] Figure 6 A schematic diagram of the structure of a cell in a photovoltaic module provided by an embodiment of the utility model;

[0032] Figure 7 A schematic diagram of the structure of another type of cell in a photovoltaic module provided by an embodiment of the utility model;

[0033] Figure 8 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 5 of the present utility model;

[0034] Fig. 9 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 6 of the present utility model;

[0035] Fig.10 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 7 of the present utility model;

[0036] Fig.11 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 8 of the present utility model;

[0037] Fig.12 A schematic diagram of the structure of a photovoltaic module provided in Embodiment 9 of the present utility model;

[0038] Fig.13 A schematic diagram of the structure of a first battery string provided in Embodiment 2 of the present utility model;

[0039] Fig.14 A schematic diagram of the structure of a second battery string provided in Embodiment 2 of the present utility model;

[0040] Fig.15 A schematic diagram of the structure of the first battery string and the third battery string in the photovoltaic module provided by the embodiment of the utility model;

[0041] Fig.16 A schematic diagram of the structure of the second battery string and the fourth battery string in the photovoltaic module provided by the embodiment of the utility model;

[0042] Fig.17 This is a schematic diagram of the structure of a photovoltaic assembly provided in the tenth embodiment of the present utility model.

[0043] Reference numerals:

[0044] 1-first battery string group, 11-first battery string, 12-third battery string, 2-second battery string group, 21-second battery string, 22-fourth battery string, 3-battery cell, 31-first battery cell, 32-second battery cell, 33-first electrical component, 34-second electrical component, 35-edge electrical component, 36-chamfered portion, 4-string connector, 41-first string connector, 42-second string connector, 43-third string connector, 44-fourth string connector, 45-lead-out end, 5-piece connector, 51-end piece connector, 511-first end piece connector, 512-second end piece connector, 52-head end piece connector, 521-first head end piece connector, 522-second head end piece connector. DETAILED DESCRIPTION

[0045] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0046] Reference Figure 1 , Figure 4 and Figure 6 The utility model discloses a photovoltaic module, including a plurality of battery string groups and a series connection structure connected to the plurality of battery string groups, each battery string group includes a plurality of battery strings arranged at intervals along a first direction, the battery string includes a plurality of battery sheets 3 connected by a plurality of sheet connectors 5, the battery sheet 3 includes a plurality of electrical components electrically connected to the plurality of sheet connectors 5; the series connection structure includes a plurality of series connectors 4, the sheet connectors located at the ends of the battery string are connected to the series connectors 4, the sheet connectors 5 connected to the lead-out ends 45 of each series connector are connected to the edge electrical components 35 in the battery sheet 3; the plurality of electrical components include a first electrical component 33 and a second electrical component 34 of opposite conductive types, along the first direction, the distance between the center line of the adjacent first electrical component 33 and the center line of the second electrical component 34 is the first distance, the distance between the sheet connectors 5 connected to the lead-out ends 45 of two adjacent series connectors is the second distance L, and the second distance is less than or equal to the first distance.

[0047] Specifically, the distance between the sheet connectors 5 connected to the lead-out ends 45 of two adjacent serial connectors 4, that is, the distance between the sheet connectors 5 at the edges connected to the lead-out ends 45 of two adjacent serial connectors 4, may be the distance between the sheet connectors 5 at the edges adjacent to each other in the upper and lower directions, for example Figure 5 The distance L shown in, or the distance between the sheet connectors 5 of two adjacent edges along the first direction, the distance between the sheet connectors 5 of two adjacent edges can at least mean: the distance between the center lines of the sheet connectors 5 of two adjacent edges, or the distance between the inner sides of the sheet connectors 5 of two edges.

[0048] Each battery string group includes a plurality of battery strings arranged at intervals along a first direction, and the number of battery cells 3 in each battery string is an odd number or an even number. Battery cell 3 may be a back contact battery cell, specifically an IBC (Interdigitated Back Contact) battery. There is no electrode on the front of the back contact battery cell, and both the positive and negative electrodes are arranged on the backlight side of the battery cell, thereby reducing the shading of the electrode on the front of the battery cell, increasing the light receiving area on the front of the battery cell, and improving the photoelectric conversion performance of the battery cell. Battery cell 3 is a sliced ​​battery cell, and the sliced ​​battery cell may be a two-slice battery, a three-slice battery, or a four-slice battery.

[0049] Battery or eight-piece battery.

[0050] The electrical components on the battery cell 3 are main grid lines or pads. The sheet connector 5 can be a welding strip. The welding strip is a flat welding strip or a round welding strip, and the welding strip can also be set to other shapes according to actual needs. The welding strip can be a tin-plated welding strip, and the thickness of the tin-plated layer in the tin-plated welding strip is 1 micron-25 microns. The welding strip can also be a non-tin-plated welding strip, such as an oxygen-free copper strip. The serial connector 4 can be a bus bar. Multiple serial connectors 4 are arranged at intervals along the first direction. The multiple serial connectors can be partially the same or completely different. The first direction can refer to Figure 1 The arrow in A shows the direction.

[0051] The multiple electrical components in the battery cell 3 include edge electrical components 35, that is, electrical components located at the edges of both sides of the battery cell 3. The series connector 4 has a lead-out end 45 close to the adjacent series connector 4, and the lead-out end 45 is connected to a lead-out section, and the lead-out section passes through the through hole on the back plate and is connected to the junction box. The sheet connector 5 connected to the lead-out end 45 of each series connector is connected to the edge electrical component 35 in the battery cell 3, so that along the first direction, the distance between the lead-out ends 45 of two adjacent series connectors 4 is smaller than the distance between the edge electrical components 35 in two adjacent battery cells 3 along the first direction, but because the edge electrical component 35 is connected to the sheet connector 5, the distance between the lead-out ends 45 of two corresponding adjacent series connectors 4 is smaller than the second distance L.

[0052] The first distance can be referred to Figure 6 The first distance L1 shown in FIG. 1 is the distance between the center line of the first electrical component 33 and the center line of the second electrical component 34 adjacent to each other along the first direction on the same battery cell 3. The second distance L between the sheet connectors 5 connected by the lead-out ends 45 of two adjacent series connectors 4 is less than or equal to the first distance L1. It should be noted that the figure is only for illustration, and the distance between the edge electrical component 35 on the actual battery cell and the edge of the battery cell is very small, so that the second distance is less than or equal to the first distance.

[0053] In the embodiment of the utility model, the sheet connector 5 connected to the lead-out end 45 of each series connector 4 is connected to the edge electrical component 35 in the battery cell 3, and the distance between the edge electrical components 35 in two adjacent battery cells 3 along the first direction is small, and the distance between the sheet connector 5 connected to the lead-out end 45 of two adjacent series connectors 4 is less than or equal to the distance between the center line of the adjacent first electrical component 33 and the center line of the second electrical component 34, thereby making the distance between the lead-out end 45 of adjacent series connectors 4 smaller, and further making the size of the through hole on the back panel smaller, making it difficult for water vapor to enter the interior of the photovoltaic module, and the sealing performance of the photovoltaic module is good. At the same time, the size of the junction box can also be set smaller, thereby reducing the cost of the photovoltaic module.

[0054] The first electrical component 33 is specifically an electrical component of the first conductivity type, and the second electrical component 34 is specifically an electrical component of the second conductivity type. The first conductivity type is positive polarity, and the second conductivity type is negative polarity, or the first conductivity type is negative polarity, and the second conductivity type is positive polarity. The electrical component is a main grid line or a pad. Preferably, the electrical component is a main grid line, and the first electrical component 33 is specifically a first main grid line of the first conductivity type, and the second electrical component 34 is specifically a second main grid line of the second conductivity type. The first main grid line and the second main grid line are arranged at intervals along the first direction on the battery cell 3.

[0055] The sliced ​​battery cell is preferably a two-piece battery, refer to Figure 6 and Figure 7 , the two-piece battery is obtained by cutting the entire battery cell into two halves. The number of electrical components in each battery cell 3 is preferably an even number. The number of main grid lines on the entire battery cell can specifically be 8, 10, 12, 14, 16, 18, 20, etc., and the number of main grid lines on the entire battery cell is preferably 10-20. The number of first main grid lines on the entire battery cell is equal to the number of second main grid lines. For example, when there are 8 main grid lines on the entire battery cell, the 8 main grid lines include 4 first main grid lines and 4 second main grid lines.

[0056] The width of the main grid line is 40 microns to 80 microns, specifically 40 microns, 50 microns, 60 microns, 70 microns or 80 microns. The width of the main grid line is preferably 50 microns to 60 microns, specifically 50 microns, 55 microns, 60 microns. The number of solder joints on the main grid line is 8 to 20, and the area of ​​each solder joint is substantially the same.

[0057] Reference Figure 1 , the multiple battery string groups include a first battery string group 1 and a second battery string group 2, and the multiple string connectors are all located between the first battery string group 1 and the second battery string group 2; the first battery string group 1 includes a first battery string 11 and a third battery string 12 adjacent to the first battery string 11, and the first battery string 11 and the third battery string 12 are alternately distributed, and the second battery string group 2 includes a second battery string 21 and a fourth battery string 22 adjacent to the second battery string 21, and the second battery string 21 and the fourth battery string 22 are alternately distributed.

[0058] Specifically, a plurality of first battery strings 11 and third battery strings 12 are arranged parallel to each other and spaced apart in a first direction. The positive and negative poles of the first battery string 11 and the third battery string 12 are in opposite directions or the current transmission directions are opposite. A plurality of second battery strings 21 and fourth battery strings 22 are arranged parallel to each other and spaced apart in a first direction. The positive and negative poles of the second battery string 21 and the fourth battery string 22 are in opposite directions or the current transmission directions are opposite.

[0059] Reference Fig.15 , Fig.16, the battery cell in the first battery string has a first right-angled side close to the third battery string, the battery cell in the third battery string has a third right-angled side close to the first battery string, and along the first direction, the distance between the first right-angled side and the third right-angled side is L3, the battery cell in the second battery string has a second right-angled side close to the fourth battery string, the battery cell in the fourth battery string has a fourth right-angled side close to the second battery string, and along the first direction, the distance between the second right-angled side and the fourth right-angled side is L4, satisfying: the absolute value of the difference between L3 and L4 is less than or equal to a preset value, and the preset value is 2mm or 3mm.

[0060] The absolute value of the difference between L3 and L4 is less than or equal to the preset value, which can appropriately make the string spacing of the first battery string group 1 and the second battery string group 2 close to each other, avoid too large a difference in the string spacing of the first battery string group 1 and the second battery string group 2, ensure the regularity of the overall structure of the multiple battery string groups, and appropriately reduce the overall structural size of the multiple battery string groups, so that the overall structure of the photovoltaic module is more compact.

[0061] Reference Fig.15 The battery cell in the first battery string 11 has a first right-angled side close to the third battery string 12, and the battery cell in the third battery string 12 has a third right-angled side close to the first battery string 11. Along the first direction, the distance between the first right-angled side and the third right-angled side is less than or equal to 5 mm.

[0062] Specifically, the first right angle side is parallel to the third right angle side. Along the first direction, the distance between the first right angle side and the third right angle side can be referred to as Fig.15 As shown in L3, the distance L3 between the first right angle side and the third right angle side is less than or equal to 5 mm, and can be specifically 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. When the distance between the first right angle side and the third right angle side is within the above range, the creepage distance between the first battery string 11 and the third battery string 12 can also be properly guaranteed.

[0063] Reference Fig.16 The battery cell in the second battery string 21 has a second right-angled side close to the fourth battery string 22, and the battery cell in the fourth battery string 22 has a fourth right-angled side close to the second battery string 21. Along the first direction, the distance between the second right-angled side and the fourth right-angled side is less than or equal to 5 mm.

[0064] Specifically, the second right-angled side is parallel to the fourth right-angled side. Along the first direction, the distance between the second right-angled side and the fourth right-angled side can be referred to as Fig.16As shown in L4, the distance L4 between the second right angle side and the fourth right angle side is less than or equal to 5 mm, and can be specifically 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc. L4 can be equal to L3 or different from L3. When the distance between the second right angle side and the fourth right angle side is within the above range, the creepage distance between the second battery string 21 and the fourth battery string 22 can also be properly guaranteed.

[0065] Reference Figures 1 to 5 , Figures 8 to 11 , along the first direction, adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides are arranged in a staggered manner.

[0066] Specifically, along the first direction, adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides are not aligned. The two sides mentioned above specifically refer to the two sides along the second direction, for example, referring to Figure 1 , along the first direction, the sheet connector 5 connected to the serial connector 4 from one side of the second direction is offset from the adjacent sheet connector 5 connected to the same serial connector 4 from the other side of the second direction. The second direction is perpendicular to the first direction, and the second direction can be referred to Figure 1 The direction indicated by the arrow B in the figure. The sheet connector 5 is specifically welded on the string connector 4. Along the first direction, the electrical components on the battery sheets 3 on both sides electrically connected to the same string connector 4 can also be aligned and distributed, that is, the extension lines of the electrical components on the battery sheets 3 on both sides electrically connected to the same string connector 4 are on the same straight line. In the embodiment of the utility model, when multiple sheet connectors 5 are welded on the same string connector 4, they are staggered welding, which makes welding easier to operate, has high welding reliability, and is easy to repair.

[0067] Reference Figure 2 The sheet connectors at the ends of the battery string include an end sheet connector 51 connecting the first battery string group 1 with the string connection structure and a head end sheet connector 52 connecting the second battery string group 2 with the string connection structure.

[0068] Specifically, one end of the end piece connector 51 is connected to the string connection structure, and the other end is connected to the battery cell at the end of the first battery string group 1, wherein the end of the first battery string group 1 refers to an end of the first battery string group 1 close to the string connection structure. One end of the head end piece connector 52 is connected to the string connection structure, and the other end is connected to the battery cell at the head end of the second battery string group 2, wherein the head end of the second battery string group 2 refers to an end of the second battery string group 2 close to the string connection structure.

[0069] Reference Figure 3The end piece connector 51 includes a plurality of first end piece connectors 511 connecting the first battery string 11 with the string connection structure and a plurality of second end piece connectors 512 connecting the third battery string 12 with the string connection structure, and the head end piece connector 52 includes a plurality of first head end piece connectors 521 connecting the second battery string 21 with the string connection structure and a plurality of second head end piece connectors 522 connecting the fourth battery string 22 with the string connection structure.

[0070] Specifically, one end of the first terminal piece connector 511 is connected to the string connector 4, and the other end is connected to the battery cell at the end of the first battery string 11, wherein the end of the first battery string 11 refers to an end of the first battery string 11 close to the string connector 4. One end of the second terminal piece connector 512 is connected to the string connector, and the other end is connected to the battery cell at the end of the third battery string 12, wherein the end of the third battery string 12 refers to an end of the third battery string 12 close to the string connector 4.

[0071] One end of the first head-end piece connector 521 is connected to the string connector 4, and the other end is connected to the cell at the head end of the second battery string 21, wherein the head end of the second battery string 21 refers to an end of the second battery string 21 close to the string connector 4. One end of the second head-end piece connector 522 is connected to the string connector, and the other end is connected to the cell at the head end of the fourth battery string 22, wherein the head end of the fourth battery string 22 refers to an end of the fourth battery string 22 close to the string connector 4.

[0072] Reference Figure 1 , Figure 4 , Figure 8 and Fig.11 The end piece connectors 51 are respectively located on the same side of the head end piece connector 52 along the first direction.

[0073] The first side is the first battery string 11 located at the edge. Figure 1 The left side of the third battery string 12 located at the edge in the first direction is taken as the second side, that is, Figure 1 on the right side of the screen. Figure 1 and Figure 8 In the embodiment, the end piece connectors 51 are respectively located at the first side of the head end piece connector 52 along the first direction, that is, the end piece connector 51 is offset to the left from the head end piece connector 52 . Figure 4 and Fig.11 In the embodiment, the end piece connecting members 51 are respectively located at the second side of the head end piece connecting member 52 along the first direction, that is, the end piece connecting member 51 is right-staggered with the head end piece connecting member 52 .

[0074] Reference Figure 2 , Figure 3 , Fig. 9 and Fig.10The multiple first end piece connectors 511 are respectively located on one side of the corresponding multiple first head end piece connectors 521 along the first direction; the multiple second end piece connectors 512 are respectively located on the other side of the corresponding multiple second head end piece connectors 522 along the first direction.

[0075] Reference Figure 2 and Fig. 9 The plurality of first end piece connectors 511 are respectively located at the first side of the corresponding plurality of first head end piece connectors 521 along the first direction, and the plurality of second end piece connectors 512 are respectively located at the second side of the corresponding plurality of second head end piece connectors 522 along the first direction.

[0076] Reference Figure 3 and Fig.10 The plurality of first end piece connectors 511 are respectively located at the second side of the corresponding plurality of first head end piece connectors 521 along the first direction, and the plurality of second end piece connectors 512 are respectively located at the first side of the corresponding plurality of second head end piece connectors 522 along the first direction.

[0077] Reference Figure 1 , Figure 4 , Figure 8 and Fig.11 The two sheet connectors 5 respectively connected to the lead-out ends 45 of two adjacent string connectors 4 are respectively connected to the battery sheets in the first battery string group 1 and the battery sheets in the second battery string group 2 .

[0078] Reference Figure 2 and Fig. 9 The two sheet connectors 5 respectively connected to the lead-out ends 45 of two adjacent string connectors 4 are both connected to two battery sheets in the second battery string group 2 .

[0079] Reference Figure 3 and Fig.10 The two sheet connectors 5 respectively connected to the lead-out ends 45 of two adjacent string connectors 4 are both connected to two battery sheets in the first battery string group 1 .

[0080] Reference Figures 1 to 4 , Figures 8 to 11 , the conductivity types of the electrical components connected to the first end piece connector 511 and the second end piece connector 512 are opposite; and / or, the conductivity types of the electrical components connected to the first head end piece connector 521 and the second head end piece connector 522 are opposite; the conductivity types of the electrical components connected to the first end piece connector 511 and the first head end piece connector 521 are the same; and / or, the conductivity types of the electrical components connected to the second end piece connector 512 and the second head end piece connector 522 are the same.

[0081] Reference Figure 5The plurality of string connectors include a first string connector 41, a second string connector 42, a third string connector 43 and a fourth string connector 44 arranged in sequence. The plurality of first battery strings 11 and the second battery strings 21 are connected to at least one of the plurality of string connectors 4 through the sheet connector, and the plurality of third battery strings 12 and the fourth battery string 22 are connected to at least one of the plurality of string connectors 4 through the sheet connector.

[0082] In some embodiments, a plurality of first battery strings 11 may be connected to at least one of the first string connector 41, the second string connector 42, and the third string connector 43 through the sheet connector, a plurality of third battery strings 12 may be connected to at least one of the second string connector 42, the third string connector 43, and the fourth string connector 44 through the sheet connector, and a plurality of second battery strings 21 may be connected to at least one of the second string connector 42, the third string connector 43, and the fourth string connector 44 through the sheet connector.

[0083] At least one of the first string connector 41 , the second string connector 42 , and the third string connector 43 , and a plurality of fourth battery strings 22 may be connected to at least one of the second string connector 42 , the third string connector 43 , and the fourth string connector 44 through the sheet connector.

[0084] In some embodiments, multiple first end-piece connectors 511 connect the first electrical component 33 and the first string connector 41 on the battery cell at the end of the first battery string 11, and multiple first head-end piece connectors 521 connect the first electrical component 33 and the first string connector 41 on the battery cell at the head end of the second battery string 21. The multiple first end-piece connectors 511 and the multiple first head-end piece connectors 521 are all staggered.

[0085] A plurality of second end-piece connectors 512 connect the second electrical components 34 and the second string connectors 42 on the battery cells at the end of the third battery string 12, and a plurality of second head-end piece connectors 522 connect the second electrical components 34 and the second string connectors 42 on the battery cells at the head end of the fourth battery string 22. The plurality of second end-piece connectors 512 and the plurality of second head-end piece connectors 522 are staggeredly distributed.

[0086] In some embodiments, multiple first end-piece connectors 511 connect the first electrical component 33 and the second string connector 42 on the battery cell at the end of the first battery string 11, and multiple first head-end piece connectors 521 connect the first electrical component 33 and the second string connector 42 on the battery cell at the head end of the second battery string 21. The multiple first end-piece connectors 511 and the multiple first head-end piece connectors 521 are staggered.

[0087] In some embodiments, a plurality of second end-piece connectors 512 connect the second electrical components 34 and the third string connector 43 on the battery cell at the end of the third battery string 12, a plurality of second head-end piece connectors 522 connect the second electrical components 34 and the third string connector 43 on the battery cell at the head end of the fourth battery string 22, and the plurality of second end-piece connectors 512 and the plurality of second head-end piece connectors 522 are staggeredly distributed.

[0088] In some embodiments, multiple first end-piece connectors 511 connect the first electrical component 33 and the third string connector 43 on the battery cell at the end of the first battery string 11, and multiple first head-end piece connectors 521 connect the first electrical component 33 and the third string connector 43 on the battery cell at the head end of the second battery string 21. The multiple first end-piece connectors 511 and the multiple first head-end piece connectors 521 are all staggered.

[0089] In some embodiments, a plurality of second end-piece connectors 512 connect the second electrical component 34 and the fourth string connector 44 on the battery cell at the end of the third battery string 12, a plurality of second head-end piece connectors 522 connect the second electrical component 34 and the fourth string connector 44 on the battery cell at the head end of the fourth battery string 22, and the plurality of second end-piece connectors 512 and the plurality of second head-end piece connectors 522 are staggeredly distributed.

[0090] Reference Figures 1 to 4 , Figures 8 to 11 Along the first direction, the conductivity types of two edge electrical components 35 close to each other on two adjacent battery cells 3 in two adjacent battery strings are the same or opposite.

[0091] In some embodiments, Figure 1 , Figure 4 In the figure, along the first direction, the battery cell at the end of the first battery string 11 is adjacent to the battery cell at the end of the third battery string 12, and the two edge electrical components 35 close to each other on the two battery cells 3 have the same conductivity type, both of which are the first conductivity type or the second conductivity type.

[0092] In some embodiments, Figure 2 , Figure 3 In the figure, along the first direction, the battery cell at the end of the first battery string 11 is adjacent to the battery cell at the end of the third battery string 12, and the conductivity types of the two edge electrical components 35 close to each other on the two battery cells 3 are opposite, one of which is the first conductivity type and the other is the second conductivity type.

[0093] Along the first direction, the distance between two adjacent first end piece connectors 511, the distance between two adjacent second end piece connectors 512, the distance between two adjacent first head end piece connectors 521, and the distance between two adjacent second head end piece connectors 522 are all equal to twice the first distance.

[0094] The distance between the two adjacent first end piece connectors 511 specifically refers to the distance between the center lines of the two adjacent first end piece connectors 511 along the first direction, and the distance between the two adjacent second end piece connectors 512 specifically refers to the distance between the center lines of the two adjacent second end piece connectors 512 along the first direction. The distance between the two adjacent first head end piece connectors 521 specifically refers to the distance between the center lines of the two adjacent first head end piece connectors 521 along the first direction, and the distance between the two adjacent second head end piece connectors 522 specifically refers to the distance between the center lines of the two adjacent second head end piece connectors 522 along the first direction.

[0095] Along the first direction, the distance between adjacent first end piece connectors 511 and first head end piece connectors 521 electrically connected on the same series connector from both sides is equal to the first distance; and / or, along the first direction, the distance between adjacent second end piece connectors 512 and second head end piece connectors 522 electrically connected on the same series connector from both sides is equal to the first distance.

[0096] Apart from Fig.12 , Fig.17 In addition, along the first direction, the distance between the center lines of two adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides is equal to the first distance.

[0097] The distance between the adjacent first end piece connectors 511 and the first head end piece connectors 521 electrically connected from both sides to the same series connector 4 specifically refers to the distance between the center lines of the adjacent first end piece connectors 511 and the first head end piece connectors 521 electrically connected from both sides to the same series connector 4 along the first direction. The distance between the adjacent second end piece connectors 512 and the second head end piece connectors 522 electrically connected from both sides to the same series connector 4 specifically refers to the distance between the center lines of the adjacent second end piece connectors 512 and the second head end piece connectors 522 electrically connected from both sides to the same series connector 4 along the first direction, which can be specifically referred to Figure 2 L2 shown in FIG. In the embodiment of the present invention, the plurality of sheet connectors 5 are evenly staggered, so that the current transmission is more even.

[0098] Reference Fig.12 and Fig.17 , along the first direction, the positions of adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides correspond.

[0099] In this embodiment, the lead-out end 45 of each string connector 4 is connected to two sheet connectors 5, wherein one sheet connector 5 is connected to the battery sheets in the first battery string group 1, and the other sheet connector 5 is connected to the battery sheets in the second battery string group 2. Along the first direction, the positions of the adjacent sheet connectors 5 electrically connected to the same string connector 4 from both sides correspond to each other, that is, the positions of the adjacent sheet connectors 5 electrically connected to the same string connector 4 from both sides are completely non-misaligned or non-significantly misaligned.

[0100] In some embodiments, along the first direction, the extension lines of adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides overlap. At this time, the positions of adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides are completely non-misaligned.

[0101] In some embodiments, along the first direction, the extension lines of adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides do not overlap, and along the first direction, the distance between adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides is less than 0.5 times the first distance. In this embodiment, the misalignment of adjacent sheet connectors 5 electrically connected to the same series connector 4 from both sides is small, less than 0.5 times the first distance.

[0102] Each battery string includes a plurality of battery cells 3 arranged at intervals along the second direction. The plurality of battery cells 3 include a plurality of first battery cells 31 and second battery cells 32 arranged in sequence. Figure 6 The first battery cell 31 is rotationally symmetrical with the second battery cell 32. The first electrical component 33 on the first battery cell 31 is rotationally symmetrical with the second battery cell 32.

[0103] The second electrical component 34 on the cell 32 is on the extension line, and the second electrical component 34 on the first cell 31 is on the extension line of the first electrical component 33 on the second cell 32. The center point of rotational symmetry between the first cell 31 and the second cell 32 is the center point of the entire cell before slicing.

[0104] Reference Figure 7 , the first battery cell 31 and the second battery cell 32 each include a plurality of first electrical components 33 of the first conductivity type and a plurality of second electrical components 34 of the second conductivity type, the first electrical components 33 and the second electrical components 34 are sequentially distributed on the first battery cell 31, and the first electrical components 33 and the second electrical components 34 are sequentially distributed on the second battery cell 32. The first electrical components 33 and the second electrical components 34 on the first battery cell 31 correspond to the first electrical components 33 and the second electrical components 34 on the second battery cell 32, respectively. In this embodiment, after the entire battery cell is cut into the first battery cell 31 and the second battery cell 32, the second battery cell 32 needs to be rotated 180 degrees during typesetting.

[0105] However, in the embodiment of the utility model, since the first electrical component 33 and the second electrical component 34 on the first battery cell 31 correspond to the second electrical component 34 and the first electrical component 33 on the second battery cell 32, respectively, after the entire battery cell is cut into the first battery cell 31 and the second battery cell 32, the number of times the first battery cell 31 or the second battery cell 32 is rotated during the actual battery string preparation process can be reduced during typesetting.

[0106] Figure 7 , Fig.13 , Fig.14 As shown, the sheet connector 5 connects the first electrical component 33 and / or the second electrical component 34. In some embodiments, the sheet connector 5 connects the first electrical component 33 on the corresponding first battery sheet 31 or the second electrical component 34 on the second battery sheet 32; or, the sheet connector 5 can also connect the second electrical component 34 on the corresponding first battery sheet 31 and the first electrical component 33 on the second battery sheet 32.

[0107] The battery cell 3 has a right angle portion, and the right angle portions of at least two adjacent battery cells 3 in each battery string are adjacent; and / or the battery cell 3 has a chamfered portion, and the chamfered portions 36 of at least two adjacent battery cells 3 in each battery string are adjacent.

[0108] Specifically, each battery string includes a plurality of battery cells 3 arranged at intervals along the second direction, and the plurality of battery cells 3 include a plurality of first battery cells 31 and second battery cells 32 arranged in sequence. Figure 3 In the first battery string 11 and the third battery string 12, the right angle portion of the first battery cell 31 is adjacent to the right angle portion of the second battery cell 32 adjacent to one side, and the chamfered portion 36 of the first battery cell 31 is adjacent to the chamfered portion 36 of the second battery cell 32 adjacent to the other side.

[0109] Further, see Figure 2 , Figure 3 In the embodiment of the utility model, along the first direction, in two adjacent battery strings, the right-angled parts of at least two adjacent battery cells 3 are adjacent, and the chamfered parts 36 of at least two adjacent battery cells 3 are adjacent, thereby ensuring the aesthetics of the photovoltaic module layout.

[0110] The photovoltaic module provided by the embodiment of the utility model also includes a back plate, which is provided with a through hole. The cross-section of the through hole is circular or elliptical or quasi-circular or quasi-elliptical, and the radius of the circular through hole is 6mm-12mm.

[0111] Specifically, the radius of the through hole may be 6 mm, 7 mm, 8 mm, 10 mm, 11 mm, 12 mm, etc. When the size of the through hole on the back plate is within the above range, the size of the through hole is small, and the sealing performance of the photovoltaic module is good.

[0112] The battery cell 3 has at least one chamfered portion 36 , and the orthographic projection of the cell connector 5 on the battery cell 3 does not overlap with the chamfered portion 36 .

[0113] The battery cell 3 preferably has two chamfered portions 36, and the two chamfered portions 36 are located on the same side of the battery cell 3. The orthographic projection of the sheet connector 5 connected to the edge electrical component 35 on the battery cell 3 does not overlap with the chamfered portion 36. In the embodiment of the utility model, on the basis of ensuring that the sheet connector 5 connected to the lead-out end 45 of each string connector 4 is connected to the edge electrical component 35 in the battery cell 3, it is also ensured that the orthographic projection of the sheet connector 5 on the battery cell 3 does not overlap with the chamfered portion 36, thereby avoiding the risk of the chamfered portion being broken due to the sheet connector crossing over the chamfered portion.

[0114] Reference Figures 1 to 4 , Fig.12 , the number of cells 3 in each battery string is an odd number. Figures 1 to 4 The battery cell at the end of the first battery string 11 is rotationally symmetrical with the battery cell at the end of the second battery string 21, and the battery cell at the end of the third battery string 12 is rotationally symmetrical with the battery cell at the end of the fourth battery string 22. Fig.12 The battery cell at the end of the first battery string 11 has the same structure as the battery cell at the end of the second battery string 21 , and the battery cell at the end of the third battery string 12 has the same structure as the battery cell at the end of the fourth battery string 22 .

[0115] Reference Figures 8 to 11 , Fig.17 , the number of battery cells 3 included in each battery string is an even number. Figures 8 to 11 , the battery cell at the end of the first battery string 11 has the same structure as the battery cell at the end of the second battery string 21, and the battery cell at the end of the third battery string 12 has the same structure as the battery cell at the end of the fourth battery string 22. Fig.17 The battery cell at the end of the first battery string 11 is rotationally symmetrical with the battery cell at the end of the second battery string 21 , and the battery cell at the end of the third battery string 12 is rotationally symmetrical with the battery cell at the end of the fourth battery string 22 .

[0116] When the number of cells 3 in each cell string is an odd number or an even number, the specific steps for preparing the photovoltaic module in each embodiment are as follows:

[0117] 1) Firstly, the first battery cell 31 and the second battery cell 32 are arranged in sequence, and then all the sheet connectors 5 are laid, and then the first battery cell 31 and the second battery cell 32 are connected in series to form a first battery string 11; then, the first battery cell 31 and the second battery cell 32 are arranged in sequence, and then all the sheet connectors 5 are laid, and then the first battery cell 31 and the second battery cell 32 are connected in series to form a third battery string 12;

[0118] 2) Firstly, arrange the first battery cell 31 and the second battery cell 32 in sequence, then lay all the sheet connectors 5, and finally connect the first battery cell 31 and the second battery cell 32 in series to form a second battery string 21; then, firstly, arrange the first battery cell 31 and the second battery cell 32 in sequence, then lay all the sheet connectors 5, and finally connect the first battery cell 31 and the second battery cell 32 in series to form a fourth battery string 22.

[0119] 3) Preparing a first battery string group 1 and a second battery string group 2. Arrange the plurality of first battery strings 11 and the third battery string 12 along the first direction, arrange the second battery string 21 and the fourth battery string 22 along the first direction, and simultaneously arrange the plurality of first battery strings 11 and the third battery string 12 along the second direction, and arrange the second battery string 21 and the fourth battery string 22 along the second direction, thereby forming the first battery string group 1 and the second battery string group 2.

[0120] 4) Connecting the first battery string group 1 to the second battery string group 2 at least through a plurality of series connectors 4. For example, an end series connector may also be used, and the end series connector and the plurality of series connectors may all be bus bars, i.e., end bus bars and intermediate bus bars commonly found in photovoltaic modules, so that a photovoltaic module to be laminated may be formed.

[0121] In an embodiment of the utility model, the sheet connector connected to the lead-out end of each series connector is connected to the edge electrical component in the battery cell, and the distance between the edge electrical components in two adjacent battery cells along the first direction is small. In addition, the distance between the sheet connectors connected to the lead-out ends of two adjacent series connectors is less than or equal to the distance between the center line of the adjacent first electrical component and the center line of the second electrical component, thereby making the distance between the lead-out ends of adjacent series connectors smaller, thereby making the size of the through hole on the back panel smaller, making it difficult for water vapor to enter the interior of the photovoltaic module, the sealing performance of the photovoltaic module is good, and the size of the junction box can also be set smaller.

[0122] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0123] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A photovoltaic module, characterized in that: The invention comprises a plurality of battery string groups and a string connection structure connected to the plurality of battery string groups, each of the battery string groups comprises a plurality of battery strings arranged at intervals along a first direction, the battery string comprises a plurality of battery sheets connected by a plurality of sheet connectors, and the battery sheets comprise a plurality of electrical components electrically connected to the sheet connectors; The string connection structure comprises a plurality of string connectors, the sheet connectors at the ends of the battery string are connected to the string connectors, and the sheet connectors connected to the lead-out ends of each string connector are connected to the edge electrical components in the battery sheet; The plurality of electrical components include a first electrical component and a second electrical component of opposite conductivity types. Along the first direction, the distance between the center line of the adjacent first electrical component and the center line of the second electrical component is a first distance, and the distance between the sheet connectors connected to the lead ends of two adjacent series connectors is a second distance. The second distance is less than or equal to the first distance.

2. The photovoltaic module according to claim 1, characterized in that: The plurality of battery string groups include a first battery string group and a second battery string group, and the plurality of string connectors are all located between the first battery string group and the second battery string group; the first battery string group includes a first battery string and a third battery string adjacent to the first battery string, and the first battery string and the third battery string are alternately distributed; the second battery string group includes a second battery string and a fourth battery string adjacent to the second battery string, and the second battery string and the fourth battery string are alternately distributed.

3. The photovoltaic module according to claim 2, characterized in that: The battery cells in the first battery string have a first right-angled side close to the third battery string, the battery cells in the third battery string have a third right-angled side close to the first battery string, and along the first direction, the distance between the first right-angled side and the third right-angled side is L3, the battery cells in the second battery string have a second right-angled side close to the fourth battery string, and the battery cells in the fourth battery string have a fourth right-angled side close to the second battery string, and along the first direction, the distance between the second right-angled side and the fourth right-angled side is L4, satisfying: the absolute value of the difference between L3 and L4 is less than or equal to a preset value.

4. The photovoltaic module according to claim 3, characterized in that: The preset value is 2 mm or 3 mm; and / or, L3 is less than or equal to 5 mm; and / or, L4 is less than or equal to 5 mm.

5. The photovoltaic module according to claim 1 or 2, characterized in that: Along the first direction, adjacent sheet connectors electrically connected to the same series connector from both sides are arranged in a staggered manner.

6. The photovoltaic module according to claim 1 or 2, characterized in that: Along the first direction, the positions of adjacent sheet connectors electrically connected to the same series connector from both sides correspond to each other.

7. The photovoltaic module according to claim 2, characterized in that: The sheet connectors located at the ends of the battery string include an end sheet connector connecting the first battery string group and the string connection structure and a head end sheet connector connecting the second battery string group and the string connection structure.

8. The photovoltaic module according to claim 7, characterized in that: The end-piece connector includes a plurality of first end-piece connectors connecting the first battery string and the string connection structure and a plurality of second end-piece connectors connecting the third battery string and the string connection structure, and the head-end piece connector includes a plurality of first head-end piece connectors connecting the second battery string and the string connection structure and a plurality of second head-end piece connectors connecting the fourth battery string and the string connection structure.

9. The photovoltaic module according to claim 8, characterized in that: The electrical components connected by the first end piece connector and the second end piece connector have opposite conductivity types; and / or the electrical components connected by the first head end piece connector and the second head end piece connector have opposite conductivity types.

10. The photovoltaic module according to claim 8, characterized in that: The electrical components connected to the first end piece connector and the first head end piece connector have the same conductivity type; and / or the electrical components connected to the second end piece connector and the second head end piece connector have the same conductivity type.

11. The photovoltaic module according to claim 5, characterized in that: Along the first direction, the conductivity types of two edge electrical components close to each other on two adjacent battery cells in two adjacent battery strings are the same or opposite.

12. The photovoltaic module according to claim 8, characterized in that: Along the first direction, the distance between two adjacent first end piece connectors, the distance between two adjacent second end piece connectors, the distance between two adjacent first head end piece connectors, and the distance between two adjacent second head end piece connectors are all equal to twice the first distance.

13. The photovoltaic module according to claim 8, characterized in that: Along the first direction, the distance between adjacent first end piece connectors and first head end piece connectors electrically connected on the same series connector from both sides is equal to the first distance; and / or, along the first direction, the distance between adjacent second end piece connectors and second head end piece connectors electrically connected on the same series connector from both sides is equal to the first distance.

14. The photovoltaic module according to claim 6, characterized in that: Along the first direction, the extension lines of adjacent sheet connectors electrically connected to the same series connector from both sides overlap; or, along the first direction, the extension lines of adjacent sheet connectors electrically connected to the same series connector from both sides do not overlap, and along the first direction, the distance between adjacent sheet connectors electrically connected to the same series connector from both sides is less than 0.5 times the first distance.

15. The photovoltaic module according to claim 2, characterized in that: The plurality of string connectors include a first string connector, a second string connector, a third string connector and a fourth string connector which are arranged in sequence, the plurality of the first battery strings and the second battery strings are connected to at least one of the plurality of string connectors via the sheet connector, and the plurality of the third battery strings and the fourth battery strings are connected to at least one of the plurality of string connectors via the sheet connector.

16. The photovoltaic module according to claim 1 or 2, characterized in that: The plurality of battery cells include a plurality of first battery cells and second battery cells arranged in sequence, wherein the first battery cells are rotationally symmetrical with the second battery cells; and / or the battery cells have a right-angle portion, and the right-angle portions of at least two adjacent battery cells in each battery string are adjacent; and / or the battery cells have a chamfered portion, and the chamfered portions of at least two adjacent battery cells in each battery string are adjacent.

17. The photovoltaic module according to claim 1 or 2, characterized in that: The sheet connector connects the first electrical component and / or the second electrical component; and / or the battery cell has at least one chamfered portion, and the positive projection of the sheet connector on the battery cell does not overlap with the chamfered portion; and / or the battery cell is a back-contact battery cell; and / or the first electrical component is a main grid line or a pad and the second electrical component is a main grid line or a pad; and / or the number of battery cells in each of the battery strings is an odd number or an even number.

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