CN111640812A

CN111640812A - Photovoltaic module

Info

Publication number: CN111640812A
Application number: CN202010462918.3A
Authority: CN
Inventors: 邓士锋; 董经兵; 夏正月; 许涛; 邢国强
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd; Canadian Solar Manufacturing Changshu Inc
Priority date: 2017-12-30
Filing date: 2017-12-30
Publication date: 2020-09-08
Anticipated expiration: 2037-12-30
Also published as: CN109994567B; CN109994567A; CN111640812B

Abstract

The invention discloses a photovoltaic module, which comprises: the solar cell module comprises a cell array, wherein the cell array comprises N groups of cell string modules which are connected in series, the Nth group of cell string modules is a string of mother cell strings, two ends of the mother cell strings of the Nth group of cell string modules are connected with first bus bars, the rest groups of cell string modules comprise m strings of mother cell strings which are connected in parallel, and each mother cell string in the m strings of mother cell strings comprises A solar cells which are connected in series; the mother unit string in the Nth group of battery string modules comprises m sub-unit strings connected in parallel, each sub-unit string comprises B solar cells connected in series, the number B of the solar cells in the sub-unit strings is 1/m of the number A of the solar cells in the mother unit string, and B is A/m; wherein N is an integer of 2 or more, and m is an integer of 2 or more. According to the photovoltaic module, the stability of the output current is ensured, the internal loss of a circuit is reduced, and the overall power is improved.

Description

Photovoltaic module

The scheme is a divisional application with the application number of 201711490232.X and the application date of 2017, 12 and 30 months, and is named as a photovoltaic module.

Technical Field

The invention relates to the technical field of solar cells, in particular to a photovoltaic module.

Background

Due to the rapid growth in market demand for photovoltaic modules and the continuous innovation in photovoltaic module technology, photovoltaic modules are constantly evolving towards higher power. Fig. 1 is a layout of a base solar cell 100 'and a bus bar 120' in a conventional photovoltaic module, and it is clear from fig. 1 that each cell 100 'is connected to each other to form a string, and then two adjacent strings are connected to each other in series through an interconnection bar 110' at the lower end, and the other bus bar 120 'is led out of the cell string at the upper end to connect with a bypass diode 130'. The traditional photovoltaic module is usually to arrange the string with the welding of whole battery piece, and based on the restriction of traditional photovoltaic module self structure, the power and the conversion efficiency of traditional photovoltaic module are low, consequently, for solving the problem that the power and the conversion efficiency of traditional photovoltaic module are low, section photovoltaic module takes place in due charge.

Specifically, the slicing photovoltaic module divides a basic solar cell piece 100' into at least X slicing cell pieces through laser scribing, and then connects the slicing cell pieces in series to form a slicing cell string, wherein the current of each string of the slicing cell string is 1/X of the basic solar cell piece; and connecting the X series of sliced cells in series and parallel in a parallel mode to form a cell group, and increasing the voltage in a parallel mode to ensure the output power of the sliced photovoltaic module. Because the current in the sliced photovoltaic module is reduced to the original 1/X, the sliced photovoltaic module can effectively reduce the current mismatch of the battery pieces in the module, and the self loss of the current in the module is reduced, so that the output power of the sliced photovoltaic module is higher by about 10W compared with the photovoltaic module with the same type (namely the traditional photovoltaic module), and the sliced photovoltaic module has the advantages of low temperature coefficient, good weak light and the like; in addition, theoretically, the smaller the sliced photovoltaic cell is, the smaller the loss is, compared with the basic solar cell 100', the smaller the loss is, the output power of the sliced photovoltaic module can be effectively improved, and the popularization and the use of the sliced photovoltaic module are facilitated.

Meanwhile, as the current of the sliced battery strings is reduced, the series connection structure between the sliced battery strings is changed to ensure the power of the sliced photovoltaic module, so that the connection mode and the circuit structure of the battery pieces in the circuit of the traditional photovoltaic module are not suitable for the use of the sliced photovoltaic module.

In view of the above, there is a need for an improved photovoltaic module to solve the above problems.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a photovoltaic module, which reduces internal loss of a cell array in the photovoltaic module and increases the overall power of the photovoltaic module on the basis of ensuring stable output current of the photovoltaic module.

A photovoltaic module according to an embodiment of the present invention includes: the solar cell module comprises a cell array, wherein the cell array comprises N groups of cell string modules which are connected in series, the Nth group of cell string modules is a string of mother cell strings, two ends of the mother cell strings of the Nth group of cell string modules are connected with first bus bars, the rest groups of cell string modules comprise m strings of mother cell strings which are connected in parallel, and each mother cell string in the m strings of mother cell strings comprises A solar cells which are connected in series; the mother unit string in the Nth group of battery string modules comprises m sub-unit strings connected in parallel, each sub-unit string comprises B solar cells connected in series, the number B of the solar cells in the sub-unit strings is 1/m of the number A of the solar cells in the mother unit string, and B is A/m; wherein N is an integer of 2 or more, and m is an integer of 2 or more.

According to some embodiments of the present invention, N groups of the cell string modules are arranged in a module arrangement direction perpendicular to a string arrangement direction of the photovoltaic module, m sub-unit strings of the nth group of the cell string modules are arranged in the string arrangement direction, m string mother unit strings of the remaining groups of the cell string modules are arranged in the module arrangement direction, a solar cell in each string mother unit string of the remaining groups of the cell string modules is arranged in the string arrangement direction, and B solar cells in each sub-unit string are arranged in the string arrangement direction.

According to some embodiments of the present invention, the nth battery string module is disposed on the same side of the rest of the battery string modules.

According to some embodiments of the invention, the photovoltaic module further comprises: the bus bars are respectively positioned on two sides of the N groups of battery string modules in the string arrangement direction, the m strings of mother unit strings of each other group of battery string modules are connected in parallel through the two bus bars, one end of the other bus bar is connected with one of the two bus bars, and the other end of the other bus bar is connected between the two adjacent sub unit strings so as to realize the parallel connection between the two adjacent sub unit strings.

According to some embodiments of the invention, the photovoltaic module further comprises: and the jumper wire is positioned between two adjacent battery string modules, two ends of the jumper wire are respectively connected with two of the bus bars, and the other battery string modules are reversely connected with one bypass diode in parallel through the jumper wire.

According to some embodiments of the present invention, the plurality of bypass diodes are located on the same side of the N groups of cell string modules in the string arrangement direction.

According to some embodiments of the present invention, each of the solar cells has a long side and a short side perpendicular to each other, and the short side extends in the same direction as the string arrangement direction; each solar wafer still include with the long limit is relative the third edge that sets up, the third edge with the contained angle between the short side is greater than 45 degrees and is less than 135 degrees.

According to some embodiments of the invention, when the included angle between the third side and the short side is 90 degrees, the ratio of the lengths of the long side and the short side of the solar cell piece is m.

According to some embodiments of the invention, the cell array comprises 3 groups of the cell string modules, wherein the 3 rd group of the cell string modules is 1 row of the mother cell string, the remaining 2 groups of the cell string modules comprise 2 rows of the mother cell string, the 1 row of the mother cell string of the 3 rd group of the cell string modules comprises 2 sub-cell strings, and the number of the solar cells of the sub-cell strings is 1/2 of the number of the solar cells of the mother cell string.

According to some embodiments of the invention, each string of mother cell strings comprises 20 or 24 interconnected battery plates.

According to some embodiments of the invention, the distance between two adjacent solar cells along the string arrangement direction is 2-3 mm.

According to some embodiments of the invention, the distance between two adjacent strings of mother units is 2-3 mm.

According to some embodiments of the invention, the long side of the solar cell sheet is 156-170 mm in size.

According to some embodiments of the invention, the solar cell sheet is cut from a base solar cell sheet whose planar shape is substantially square.

The invention has the beneficial effects that: according to the photovoltaic module, the battery string modules connected in series are arranged, and the number and the connection form of the mother cell strings in the battery string modules are controlled, so that the internal loss of a battery piece array in the photovoltaic module is reduced and the overall power of the photovoltaic module is improved on the basis of ensuring the stability of the output current of the photovoltaic module, and then the purposes of reducing the operation temperature of the photovoltaic module and reducing the hot spot effect of the photovoltaic module are achieved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a photovoltaic module cell array in the prior art.

Fig. 2 is a schematic structural view of a photovoltaic module of the present invention.

Fig. 3 is a schematic structural diagram of a photovoltaic module cell array according to the present invention.

Fig. 4 is a schematic structural diagram of the solar cell in fig. 3.

Fig. 5 is a schematic structural diagram of a cell array according to a preferred embodiment of the photovoltaic module of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 2-5.

Referring to fig. 2, a photovoltaic module 100 according to the present disclosure includes a battery array 1, a first package layer 2 and a second package layer 3 respectively disposed on two sides of the battery array 1, a light-transmitting and light-receiving layer 4 disposed adjacent to the first package layer 2, and a back plate 5 disposed adjacent to the second package layer 3.

Referring to fig. 3 and 4, the battery sheet array 1 is formed by connecting N sets of battery string modules 11 in series through bus bars 12. The battery string module 11 is formed by a plurality of solar cells 13 through interconnection bars 14 and bus bars 12, and each group of battery string modules 11 is connected in parallel with bypass diodes 15.

The nth group of battery string modules 11 is a string of mother unit strings 111, two ends of the mother unit strings 111 of the nth group of battery string modules 11 are connected with first bus bars 17, and the rest groups of battery string modules 11 are formed by connecting m strings of mother unit strings 111 in parallel through the bus bars 12; the mother cell strings 111 in the nth group of battery string modules 11 are formed by connecting m sub cell strings 112 in parallel through the bus bars 12, that is, in the present invention, the number of the sub cell strings 112 in the nth group of battery string modules 11 is equal to the number of the mother cell strings 111 in each remaining group of battery string modules 11, and m is an integer greater than or equal to 2.

For example, in the example of fig. 3 and 5, the first bus bar 17 is provided on the side of the mother cell string 111 of the above-described nth group battery string module 11 away from the remaining battery string modules 11, that is, the rightmost side in fig. 3 and 5. With this arrangement, the first bus bar 17 can be disposed outside the plurality of cells 13 in the mother cell string 111 of the nth group cell string module 11, and will not intersect with the cells 13, so that the normal operation of the photovoltaic module 100 will not be affected, and the overall occupied space of the cells 13 will not be affected.

In the nth group of battery string modules 11, each subunit string 112 is formed by connecting B solar battery cells 13 in series; each mother unit string 111 in the rest m strings of mother unit strings 111 is formed by connecting a solar cells 13 in series through the interconnection bars 14; further, the number B of solar cells 13 in the subunit string 112 is 1/m of the number a of solar cells 13 in the parent unit string 111, that is, B is a/m. With such an arrangement, it can be ensured that each group of the cell string modules 11 has the same output voltage, so as to ensure the output power of the photovoltaic module 100.

Referring to fig. 3 and 5, a photovoltaic module 100 according to an embodiment of the present invention includes a cell array 1, where the cell array 1 includes N sets of cell string modules 11, and the N sets of cell string modules 11 are connected in series and arranged along a module arrangement direction perpendicular to a string arrangement direction of the photovoltaic module 100. The nth group of battery string modules 11 includes a string of mother unit strings 111, the mother unit strings 111 of the nth group of battery string modules 11 includes m sub-unit strings 112 connected in parallel and arranged along a string arrangement direction, each remaining group of battery string modules includes m strings of mother unit strings 111 connected in parallel and arranged along a module arrangement direction, each string of the m strings of mother unit strings 111 of each remaining group of battery string modules 11 includes a solar cell 13 connected in series and arranged along a string arrangement direction, each sub-unit string 112 includes B solar cells 13 connected in series and arranged along a string arrangement direction, wherein B is a/m, N, m is an integer greater than or equal to 2.

It should be noted that the above-mentioned "string arrangement direction" may be understood as an arrangement direction of the a-piece cells 13 in the mother unit string 111 (for example, an up-down direction in fig. 3 and 5), and the "module arrangement direction" is a direction perpendicular to the arrangement direction of the a-piece cells 13 in the mother unit string 111 (for example, a left-right direction in fig. 3 and 5).

In some embodiments of the present invention, referring to fig. 3 and 5, photovoltaic module 100 further comprises a plurality of bus bars 12. In the description of the present invention, "a plurality" means two or more.

Two of the bus bars 12 are respectively located on both sides of the N groups of battery string modules 11 in the string arrangement direction, the m strings of the mother cell strings 111 of each remaining group of battery string modules 11 are connected in parallel by two of the bus bars 12, one end (e.g., an upper end in fig. 3 and 5) of the other bus bar 12 is connected to one of the two bus bars 12, and the other end (e.g., a lower end in fig. 3 and 5) is connected between the adjacent two sub cell strings 112 to achieve parallel connection between the adjacent two sub cell strings 112.

For example, three sets of the battery string modules 11 and three bus bars 12 are shown in the example of fig. 3 and 5, and the three bus bars 12 may include a first sub-bus bar, a second sub-bus bar, and a third sub-bus bar. The first sub-bus bar is located on the upper side of the cell array 1, the second sub-bus bar is located on the lower side of the cell array 1, and the first sub-bus bar and the second sub-bus bar extend along the module arrangement direction. The third sub-bus bars extend along the string arrangement direction, and the upper ends of the third sub-bus bars are connected to the first sub-bus bars, and the lower ends of the third sub-bus bars are connected between two adjacent sub-unit strings 112. Therefore, by arranging the plurality of bus bars 12, the series connection between the N groups of battery string modules 11 can be well realized, and the parallel connection between the m strings of the mother cell strings 111 and the parallel connection between the two adjacent daughter cell strings 112 of each group of the rest battery string modules 11 can be realized, which is beneficial to reducing the design and process difficulties and has a simple structure.

Further, as shown in fig. 3 and 5, the photovoltaic module 100 further includes at least one jumper 16, the jumper 16 is located between two adjacent ones of the remaining battery string modules 11, two ends of the jumper 16 are respectively connected to two of the bus bars 12, and the remaining battery string modules 11 are connected in parallel with one bypass diode 15 in an opposite direction through the jumper 16. For example, referring to fig. 3 and 5, the jumper line 16 extends in the string arrangement direction, and both ends of the jumper line 16 are connected to the first sub-bus bar and the second sub-bus bar, respectively. In the example of fig. 3 and 5, three bypass diodes 15 are shown, two groups of cell string modules 11 located at the left side of the photovoltaic module 100 are connected in reverse parallel with one bypass diode 15 through a jumper 16, respectively, and the other of the three bypass diodes 15 is connected between the upper ends of the interconnection bars 14 on the third group of cell string modules 11 and the upper ends of the third sub-bus bars. Therefore, by arranging the jumper wire 16, the jumper wire 16 can facilitate the setting of the bypass diode 15, so that the bypass function can be realized when the battery string module 11 is shielded by a shadow, and the photovoltaic module 100 is prevented from being damaged due to overheating.

Alternatively, referring to fig. 3 and 5, a plurality of bypass diodes 15 are located on the same side of the N groups of cell string modules 11 in the string arrangement direction. So set up, when guaranteeing that bypass diode 15 can realize fine bypass function when battery cluster module 111 receives the shadow to shelter from, make photovoltaic module 100's simple structure, conveniently arrange.

In the invention, the distance between two adjacent strings of the mother unit strings 111 is 2-3 mm, each string of the mother unit strings 111 comprises 20 or 24 solar cells 13 connected with each other through the interconnection bar 14, and the distance between two adjacent solar cells 13 is 2-3 mm along the extension direction of the interconnection bar 14.

The solar cell sheet 13 is cut out of a base solar cell sheet (i.e., the cell sheet 100' in fig. 1) whose planar shape is substantially square. The surface of the solar cell 13 is provided with a main grid line 131 connected with the interconnection bar 14; the solar cell piece 13 is also provided with a long side 132 and a short side 133 which are perpendicular to each other, and the size of the long side of the solar cell piece 132 is 156-170 mm; the extension direction of the short side 133 is the same as the extension direction of the interconnection bar 14; and the main grid line 131 is parallel to the short side 133; each solar cell 13 further includes a third edge 134 disposed opposite to the long edge 132, and an included angle α between the third edge 134 and the short edge 133 is greater than 45 degrees and smaller than 135 degrees. When the third edge 134 and the included angle between the main grid lines 131 is 90 degrees, the length ratio of the long edge 132 and the short edge 133 of the solar cell 13 is m, that is, the solar cell 13 is arranged in a rectangular shape, so that the solar cell 13 can be conveniently cut and prepared, and meanwhile, the solar cell is convenient to weld and fix.

In the present invention, the solar cell 13 is obtained by halving the base solar cell 100 ', that is, the size of the solar cell 13 is 1/2 of the base solar cell 100', and at this time, m is 2, that is, in the present invention, the number of the subunit strings 112 in the nth group of the cell string module 11 and the number of the subunit strings 111 in each remaining group of the cell string module 11 are equal to the number of the solar cell 13 cut into halves, and are m. Of course, the cutting of the base solar cell piece 100' is not limited to the halving cutting, and the halving (m is 3) and the quartering (m is 4) cutting may be performed according to the application requirement, so as to further reduce the power loss of the solar cell piece 13 and improve the output power of the photovoltaic module 100.

Fig. 5 is a schematic structural diagram of a battery cell array 1 according to a preferred embodiment of the invention; in the present embodiment, the battery sheet array 1 'is formed by connecting 3 sets (i.e., N ═ 3) of battery string modules 11' in series, wherein the 3 rd set of battery string modules 11 'is a 1-row mother cell string 111', and the remaining 2 sets of battery string modules 11 'are respectively formed by connecting 2 rows (m ═ 2) of mother cell strings 111' in parallel; the 1-row mother cell string 111 'of the 3 rd group cell string module is divided into 2 sub-cell strings 112' connected in parallel, and the number B of the solar cells 13 in the sub-cell string 112 'is 1/2 of the number a of the solar cells in the mother cell string 111'.

In some embodiments of the present invention, as shown in fig. 3 and 5, the nth battery string module 11 is disposed on the same side of the rest of the battery string modules 11. For example, 3 sets of the battery string modules 11 are shown in the examples of fig. 3 and 5, and the 3 rd set of the battery string modules 11 are provided on the right side of the above-described remaining 2 sets of the battery string modules 11. Thus, the circuit of the photovoltaic module 100 is simple in design, convenient to arrange and high in appearance attractiveness.

In the photovoltaic module 100 according to the embodiment of the present invention, the number N of the cell string modules 11 is only 3. Of course, in other embodiments, the number N of the cell string modules 11 in the photovoltaic module 100 may also be other positive integers greater than or equal to 2, and the specific value of the number N of the cell string modules 11 is not limited herein.

In summary, in the photovoltaic module 100 of the present invention, the battery string modules 11 connected in series are arranged, and the number and connection form of the mother cell strings 111 in the battery string modules 11 are controlled, so that on the basis of ensuring stable output current of the photovoltaic module 100, the internal loss of the cell array 1 in the photovoltaic module 100 is reduced, the overall power of the photovoltaic module 100 is improved, and then the purposes of reducing the operating temperature of the photovoltaic module 100 and reducing the hot spot effect of the photovoltaic module 100 are achieved.

Other constructions and operations of photovoltaic modules according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature", "the second feature", and "the third feature" may include one or more of the features

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Claims

1. A photovoltaic module, comprising:

the solar cell module comprises a cell array, wherein the cell array comprises N groups of cell string modules which are connected in series, the Nth group of cell string modules is a string of mother cell strings, two ends of the mother cell strings of the Nth group of cell string modules are connected with first bus bars, the rest groups of cell string modules comprise m strings of mother cell strings which are connected in parallel, and each mother cell string in the m strings of mother cell strings comprises A solar cells which are connected in series; the mother unit string in the Nth group of battery string modules comprises m sub-unit strings connected in parallel, each sub-unit string comprises B solar cells connected in series, the number B of the solar cells in the sub-unit strings is 1/m of the number A of the solar cells in the mother unit string, and B is A/m; wherein N is an integer of 2 or more, and m is an integer of 2 or more.

2. The pv module according to claim 1, wherein N groups of the cell string modules are arranged in a module arrangement direction perpendicular to a string arrangement direction of the pv module, m sub-unit strings of the nth group of the cell string modules are arranged in the string arrangement direction, m strings of the cell string modules of the remaining groups are arranged in the module arrangement direction, a solar cells in each string of the sub-unit strings of the remaining groups of the cell string modules are arranged in the string arrangement direction, and B solar cells in each sub-unit string are arranged in the string arrangement direction.

3. The pv module of claim 1 wherein the nth group of said string modules is disposed on the same side of the remaining string modules.

4. The photovoltaic module of claim 1, further comprising:

the bus bars are respectively positioned on two sides of the N groups of battery string modules in the string arrangement direction, the m strings of mother unit strings of each other group of battery string modules are connected in parallel through the two bus bars, one end of the other bus bar is connected with one of the two bus bars, and the other end of the other bus bar is connected between the two adjacent sub unit strings so as to realize the parallel connection between the two adjacent sub unit strings.

5. The photovoltaic module of claim 4, further comprising:

and the jumper wire is positioned between two adjacent battery string modules, two ends of the jumper wire are respectively connected with two of the bus bars, and the other battery string modules are reversely connected with one bypass diode in parallel through the jumper wire.

6. The photovoltaic module according to claim 5, wherein a plurality of the bypass diodes are located on the same side of the N groups of the cell string modules in the string arrangement direction.

7. The photovoltaic module according to any one of claims 1 to 6, wherein each of the solar cells has a long side and a short side perpendicular to each other, and the short side extends in the same direction as the string arrangement direction; each solar wafer still include with the long limit is relative the third edge that sets up, the third edge with the contained angle between the short side is greater than 45 degrees and is less than 135 degrees.

8. The photovoltaic module according to claim 7, wherein when the included angle between the third side and the short side is 90 degrees, the ratio of the lengths of the long side and the short side of the solar cell is m.

9. The pv module of any of claims 1-6 wherein the array of cells comprises 3 groups of the string modules, wherein the 3 rd group of the string modules is a 1-column string of mother cells, the remaining 2 groups of the string modules comprise 2-column strings of mother cells, the 1 column of the string modules of the 3 rd group of the string modules comprises 2 strings of daughter cells, and the number of solar cells of the daughter strings is 1/2 of the number of solar cells of the mother strings.

10. The photovoltaic module of any of claims 1-6 wherein each string of female unit strings comprises 20 or 24 interconnected cell pieces.

11. The photovoltaic module according to any one of claims 1 to 6, wherein the distance between two adjacent solar cells along the string arrangement direction is 2-3 mm.

12. The photovoltaic module according to any one of claims 1 to 6, wherein the distance between two adjacent strings of female units is 2-3 mm.

13. The photovoltaic module according to any one of claims 1 to 6, wherein the solar cell sheet has a long side dimension of 156 to 170 mm.

14. The photovoltaic module according to any one of claims 1 to 6, wherein the solar cell sheet is cut from a base solar cell sheet whose planar shape is substantially square.