CN116031319A - Photovoltaic module - Google Patents

Abstract

The invention discloses a photovoltaic module, comprising: the battery comprises a first battery unit, a second battery unit and a third battery unit. The first battery unit comprises three first battery strings, the second battery unit is connected with the first battery unit in series and is arranged along the extending direction of the battery strings, and the second battery unit comprises three second battery strings. The third battery unit is connected with the first battery unit in parallel and is distributed along the string arrangement direction perpendicular to the extending direction of the battery strings, the third battery unit comprises two third battery strings and at least one fourth battery string, the third battery strings and the fourth battery strings are connected in parallel and are distributed along the extending direction of the battery strings, and each battery unit is connected with a bypass diode in parallel respectively. The number of the third battery pieces is 2 times that of the fourth battery pieces, the sum of the number of the third battery pieces and the number of the fourth battery pieces is N, and N is an integer multiple of 3. From this, can reduce photovoltaic module's width, reduce photovoltaic module and take off the risk of frame, improve load capacity, increase photovoltaic module size's variety.

Description

Photovoltaic module

Technical Field

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

Background

The demand on the high-power photovoltaic module in the current market is larger and larger, and the large-size battery piece and the large-size photovoltaic module have great advantages by combining cost, power and efficiency analysis, so that the market share of the photovoltaic module adopting the battery piece of 210mm in recent years is larger and larger.

However, for the circuit design of the photovoltaic module, the current of the whole battery piece is larger, the power loss caused by the resistor after a plurality of battery pieces are connected in series is more, the half-piece photovoltaic module developed in recent years can reduce the short-circuit current of the photovoltaic module, but for the large-size battery piece, the whole battery piece is cut into half and cannot meet the use current of the conventional bypass diode, and the temperature of the bypass diode is rapidly increased due to the excessively high photovoltaic module current, so that the risk of failure of the bypass diode is increased. Moreover, the bypass diode capable of passing larger current in the market is high in price, so that the production cost of the photovoltaic module is reduced and the power generation of the photovoltaic module is improved. In addition, because the size of the battery piece is larger, the width of the whole photovoltaic module is also larger and is basically more than 1300mm, challenges are brought to glass production, meanwhile, the mechanical load capacity of the photovoltaic module is also relatively reduced, and the load frame-removing risk of the photovoltaic module is increased.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a photovoltaic module, which can reduce the width of the photovoltaic module, improve the load capacity of the photovoltaic module, and reduce the failure risk of the photovoltaic module.

According to an embodiment of the invention, a photovoltaic module includes: the battery comprises a first battery unit, a second battery unit and a third battery unit. The first battery unit comprises three first battery strings, each first battery string comprises a plurality of first battery pieces which are arranged along the extending direction of the battery string, and the first battery units are reversely connected with first bypass diodes in parallel. The second battery units are connected with the first battery units in series and are distributed along the extending direction of the battery strings, each second battery unit comprises three second battery strings, each second battery string comprises a plurality of second battery pieces distributed along the extending direction of the battery string, and the second battery units are reversely connected with second bypass diodes in parallel. The third battery units are connected in series with the first battery units and are distributed along a string distribution direction perpendicular to the extending direction of the battery strings, the third battery units comprise two third battery strings and at least one fourth battery string, the two third battery strings and the fourth battery strings are connected in parallel and are distributed along the extending direction of the battery strings, each third battery string comprises a plurality of third battery pieces distributed along the extending direction of the battery strings, the fourth battery string comprises a plurality of fourth battery pieces distributed along the extending direction of the battery strings, and the third battery units are reversely connected with a third bypass diode in parallel. Along the extending direction of the battery strings, the number of the third battery pieces of the third battery string is 2 times that of the fourth battery string, the sum of the number of the third battery pieces of the third battery string and the number of the fourth battery string is N, and the N is an integer multiple of 3.

According to the photovoltaic module provided by the embodiment of the invention, the first battery unit and the second battery unit are distributed along the extending direction of the battery string, the third battery string and the fourth battery string are distributed along the extending direction of the battery string, and the number relation of the third battery piece and the fourth battery piece is controlled, so that the third battery string and the fourth battery string can be reasonably distributed along the extending direction of the battery string, the formed battery units are distributed more reasonably, the internal space of the photovoltaic module is optimized, the load frame-removing risk of the photovoltaic module is effectively reduced, the battery pieces can conveniently form battery strings and the photovoltaic module with different sizes, and more occasions can be met and applied. Moreover, by enabling the first bypass diode to be in inverse parallel connection with the first battery unit and enabling the second bypass diode to be in inverse parallel connection with the second battery unit, the reverse voltage drop of the bypass diode can be reduced, so that the risk of failure of the photovoltaic module can be reduced, the power generation of the photovoltaic module is improved, the specification of the bypass diode required to be used can be reduced, and the production cost of the photovoltaic module can be reduced.

In some embodiments, the N satisfies: n is more than or equal to 39 and less than or equal to 156.

In some embodiments, the two third battery strings are connected in parallel and arranged along the string arrangement direction, and the fourth battery string includes two sub-strings connected in series and arranged along the string arrangement direction.

In some embodiments, the photovoltaic module further comprises: the end bus bars are located at one ends, far away from the second battery units, of the first battery units and the third battery units along the extending direction of the battery strings, and extend along the arrangement direction of the battery strings, the end bus bars are electrically connected with one ends of three of the first battery units, and the end bus bars are electrically connected with one ends of two of the third battery units, so that the series connection of the first battery units and the third battery units is realized. One end of the first bus bar is connected with the end bus bar, the other end of the first bus bar is connected with the other ends of the two third battery strings and the fourth battery string, and the third bypass diode is connected to the first bus bar.

In some embodiments, the first bus bar comprises: the first sub bus bar and the second sub bus bar extend along the extending direction of the battery string, and one end of the first sub bus bar is connected with one ends of the first battery unit and the two third battery strings, which are far away from the fourth battery string. The second sub bus bar extends along the string arrangement direction, one end of the second sub bus bar is connected with the other end of the first sub bus bar, the other end of the second sub bus bar is connected with the other ends of the two third battery strings and the two ends of the fourth battery strings, and the third bypass diode is connected in series with the second sub bus bar.

In some embodiments, the second sub-bus bar comprises: the first bus section and the second bus section, wherein the first bus section extends along the string arrangement direction, and the other ends of the two third battery strings and one end of the fourth battery string are connected with the first bus section. The second bus section extends along the string arrangement direction, the second bus section is connected with the other end of the first sub bus bar and the other end of the fourth battery string, the third bypass diode is connected between the second bus section and the first bus section, the second bus section is overlapped with the first bus section, and an insulating strip is arranged between the second bus section and the first bus section.

In some embodiments, the second bus bar segment is spaced apart from at least a portion of the first bus bar segment corresponding to the second bus bar segment along the battery string extending direction.

In some embodiments, the second bus section is located on a side of the first bus section remote from the fourth battery cell when the second bus section overlaps the first bus section.

In some embodiments, the first sub-bus bar is located between the first battery cell and the third battery cell.

In some embodiments, the first sub-bus bar is located on the back of the corresponding two third battery cells; or the first sub-bus bar is located in a string gap of the adjacent first and third battery strings.

In some embodiments, the photovoltaic module further comprises: the second bus bar extends along the string arrangement direction, the first battery unit and the second battery unit are connected in series through the second bus bar, one end of the second bus bar is connected with the first bus bar, and the first bypass diode is connected in series on the second bus bar and located between the first battery unit and the first bus bar. The third bus bar extends along the extending direction of the battery string, one end of the third bus bar is connected with the second bus bar, the other end of the third bus bar is connected with one ends, far away from the second bus bar, of the three second battery strings of the second battery unit, and the second bypass diode is connected in series with the third bus bar.

In some embodiments, the photovoltaic module further comprises: fourth busbar, fifth busbar, sixth busbar, the fourth busbar is followed the cluster is arranged the direction and is extended, the fourth busbar with first battery cell with weld area connection between the second battery cell. The fifth bus bar extends along the extending direction of the battery string, one end of the fifth bus bar is connected with the fourth bus bar, the other end of the fifth bus bar is connected with one ends, far away from the fourth bus bar, of the three first battery strings of the first battery unit, and the first bypass diode is connected with the fifth bus bar to realize that the first bypass diode is in anti-parallel connection with the first battery unit. The sixth bus bar extends along the extending direction of the battery string, one end of the sixth bus bar is connected with the fourth bus bar, the other end of the sixth bus bar is connected with one end, far away from the fourth bus bar, of the fourth battery string of the second battery unit, and the second bypass diode is connected to the sixth bus bar.

In some embodiments, the number of the first battery pieces of the first battery string is twice the number of the second battery pieces of the second battery string, each of the battery pieces being one-M-th of a complete battery piece, wherein the M satisfies: m is more than or equal to 3 and less than or equal to 6.

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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic circuit configuration of a photovoltaic module according to an embodiment of the present invention.

Fig. 2 is a layout schematic of the photovoltaic module shown in fig. 1.

Fig. 3 is another layout schematic of the photovoltaic module shown in fig. 1.

Fig. 4 is a schematic circuit configuration of a photovoltaic module according to another embodiment of the present invention.

Fig. 5 is a layout schematic of the photovoltaic module shown in fig. 4.

Fig. 6 is a schematic view of a first cell, a second cell, a third cell, and a first bus bar of a photovoltaic module according to one embodiment of the present invention.

Fig. 7 is a partial enlarged view at P circled in fig. 6.

Fig. 8 is a schematic view of a first battery cell, a second battery cell, a third battery cell, and a first bus bar of a photovoltaic module according to another embodiment of the present invention.

Fig. 9 is a partial enlarged view at Q circled in fig. 8.

Reference numerals:

a photovoltaic module 100;

a first battery cell 10; a first battery string 11; a first battery piece 111; a first bypass diode 12;

a second battery cell 20; a second battery string 21; a second battery piece 211; a second bypass diode 22;

a third battery cell 30; a third battery string 31; a third battery piece 311; a fourth battery string 32; a substring 32a; a fourth battery piece 321; a third bypass diode 33;

a first bus bar 40; a first sub-bus bar 41; a second sub-bus bar 42; a first bus section 421; a second bus section 422; an insulating bar 423;

a second bus bar 50; a third bus bar 60; a fourth bus bar 70; a fifth bus bar 80; a sixth bus bar 90; an end bus bar a.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and a photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 9.

As shown in fig. 1 to 9, a photovoltaic module 100 according to an embodiment of the present invention includes a first battery cell 10, a second battery cell 20, and a third battery cell 30.

Specifically, the first battery cell 10 includes a plurality of three first battery strings 11, each first battery string 11 including a plurality of first battery pieces 111 arranged along a battery string extending direction (for example, up-down direction in fig. 1), and the first battery cell 10 is antiparallel with a first bypass diode 12. The second battery cells 20 are connected in series with the first battery cells 10 and arranged along the extending direction of the battery strings, the second battery cells 20 include three second battery strings 21, each second battery string 21 includes a plurality of second battery pieces 211 arranged along the extending direction of the battery string, and the second battery cells 20 are connected in anti-parallel with second bypass diodes 22. For example, in the example of fig. 1, the first battery cells 10 and the second battery cells 20 are arranged in the battery string extending direction, and the three first battery strings 11 of the first battery cells 10 and the three second battery strings 21 of the second battery cells 20 are connected in series in the battery string extending direction, the first bypass diode 12 is connected in anti-parallel with the first battery strings 11, and the second bypass diode 22 is connected in anti-parallel with the second battery strings 21.

The third battery cells 30 are connected in series with the first battery cells 10 and arranged in a string arrangement direction (e.g., left-right direction in fig. 1) perpendicular to the battery string extension direction, the third battery cells 30 include two third battery strings 31 and at least one fourth battery string 32, the two third battery strings 31 and the fourth battery strings 32 are connected in parallel and arranged in the battery string extension direction, each third battery string 31 includes a plurality of third battery pieces 311 arranged in the battery string extension direction, the fourth battery string 32 includes a plurality of fourth battery pieces 321 arranged in the battery string extension direction, and the third battery cells 30 are antiparallel with third bypass diodes 33. The number of the third battery pieces 311 of the third battery string 31 is 2 times the number of the battery pieces of the fourth battery string 32 in the extending direction of the battery strings, the sum of the number of the third battery pieces 311 of the third battery string 31 and the number of the fourth battery string 32 is N, and N is an integer multiple of 3.

For example, referring to fig. 1, the third battery unit 30 is connected in parallel with the first battery unit 10 in the string arrangement direction, and the third battery unit 30 may include two third battery strings 31 and one fourth battery string 32, and the two third battery strings 31 are connected in parallel with each other and then connected in parallel with the fourth battery string 32. The third bypass diode 33 is connected in anti-parallel with both the third battery string 31 and the fourth battery string 32. Here, it should be noted that the number of the first battery strings 11, the second battery strings 21, the third battery strings 31, the fourth battery strings 32, and the first battery pieces 111, the second battery pieces 211, the third battery pieces 311, and the fourth battery pieces 321 may be specifically set according to practical requirements to better satisfy practical applications, specifically, the sum of the number of the third battery pieces 311 and the fourth battery pieces 321 may be N, and meanwhile, in order to facilitate arrangement of the battery pieces, the number of the battery pieces N is an integer multiple of 3.

Therefore, by providing the first bypass diode 12, the second bypass diode 22 and the third bypass diode 33, when the battery piece (for example, the first battery piece 111, the second battery piece 211, the third battery piece 311 or the fourth battery piece 321) in the photovoltaic module 100 is subjected to the hot spot effect or damage, the corresponding bypass diode can perform the bypass effect on the battery piece, and protect other battery pieces in the photovoltaic module 100 which do not generate the hot spot effect or damage, so that the current in the photovoltaic module 100 can be smoothly led out, and the output power of the photovoltaic module 100 can be effectively ensured.

Moreover, by arranging the third cell string 31 and the fourth cell string 32 connected in parallel in the third cell unit 30 along the extending direction of the cell strings, and simultaneously controlling the number of the cell sheets forming the third cell string 31 and the fourth cell string 32 on the photovoltaic module 100, the size of the whole photovoltaic module 100, for example, the width of the photovoltaic module 100 in the string arrangement direction, can be relatively reduced, so that the challenges to glass production are reduced, the mechanical load capacity of the photovoltaic module can be improved, the load frame-removing risk of the photovoltaic module 100 is effectively reduced, the diversity of the cell sheet arrangement modes is facilitated to be increased, and the photovoltaic module 100 with various sizes is formed. Moreover, the arrangement of large-size battery pieces, such as 210mm battery pieces, can be realized by adopting glass with a conventional width, and for example, the arrangement of four, three and five strings can be realized. In addition, by arranging the first battery cells 10 and the second battery cells 20 which are arranged along the extending direction of the battery string and are connected in series, and enabling the first bypass diode 12 to be in anti-parallel connection with the first battery cells 10, and enabling the second bypass diode 22 to be in anti-parallel connection with the second battery cells 20, the number of corresponding battery pieces protected by the corresponding bypass diodes is relatively reduced, so that the reverse voltage drop of the bypass diodes can be reduced, the risk of failure of the photovoltaic module 100 can be reduced, the power generation of the photovoltaic module 100 is improved, the specification of the bypass diodes required to be used can be reduced, and the production cost of the photovoltaic module 100 can be reduced.

In summary, according to the photovoltaic module 100 of the embodiment of the present invention, the first battery unit 10 and the second battery unit 20 are arranged along the extending direction of the battery string, and the third battery string 31 and the fourth battery string 32 are arranged along the extending direction of the battery string, so that the number relationship between the third battery piece 311 and the fourth battery piece 321 is controlled, so that the third battery string 31 and the fourth battery string 32 can be reasonably distributed in the extending direction of the battery string, the formed battery units are more reasonably arranged, the internal space of the photovoltaic module 100 is optimized, the load frame-removing risk of the photovoltaic module 100 is effectively reduced, and battery pieces can form battery strings with different sizes and the photovoltaic module 100 conveniently, so that the battery strings can meet and be suitable for more occasions. Moreover, by reversely connecting the first bypass diode 12 with the first battery cell 10 in parallel and connecting the second bypass diode 22 with the second battery cell 20 in parallel, the reverse voltage drop of the bypass diode can be reduced, so that the risk of failure of the photovoltaic module 100 can be reduced, the generated power of the photovoltaic module 100 can be improved, the specification of the bypass diode to be used can be reduced, and the production cost of the photovoltaic module 100 can be reduced.

Further, N satisfies: n is more than or equal to 39 and less than or equal to 156. For example, n=39, n=117, or n=156. Thus, the number of the battery pieces of the photovoltaic module 100 forming the third battery string 31 and the fourth battery string 32 is controlled, the size of the photovoltaic module 100 in the string arrangement direction can be relatively reduced, challenges to glass production are reduced, and the mechanical load capacity of the photovoltaic module 100 can be improved.

According to some embodiments of the present invention, referring to fig. 1 and 4, two third battery strings 31 are connected in parallel and arranged in a string arrangement direction. The fourth battery string 32 includes two sub-strings 329, and the two sub-strings 329 are connected in series and arranged in the string arrangement direction. For example, in the example of fig. 1 and 4, the number of the third battery strings 31 is two, the two third battery strings 31 are arranged in the string arrangement direction and connected in parallel, the fourth battery string 32 includes two sub-strings 329, the two sub-strings 329 are arranged in the string arrangement direction and connected in series, and the two sub-strings 329 are respectively opposite to the two third battery strings 31. So set up, two substrings 329 can set up with two third battery strings 31 relatively, when reducing the width of photovoltaic module 100, have improved space utilization, have optimized the structure of arranging of battery strings and photovoltaic module 100.

According to some alternative embodiments of the present invention, as shown in fig. 1 to 5, the photovoltaic module 100 further includes an end bus bar a, a first bus bar 40, the end bus bar a being located at one end (e.g., an upper end in fig. 1) of the first and third battery cells 10 and 30, which is remote from the second battery cell 20, in the battery string extending direction, and the end bus bar a extending in the battery string arranging direction, the end bus bar a being electrically connected with one end of three first battery strings 11 in the first battery cell 10, and the end bus bar a being electrically connected with one end of two third battery strings 31 in the third battery cell 30, to achieve the series connection of the first and third battery cells 10 and 30. One end (e.g., upper end in fig. 1) of the first bus bar 40 is connected to the end bus bar a, and the other end (e.g., lower end in fig. 1) of the first bus bar 40 is connected to the other ends (e.g., lower end in fig. 1) of the two third battery strings 31 and the fourth battery string 32. For example, referring to fig. 1 to 5, the upper end of the first bus bar 40 is connected to the end bus bar a between the first battery cell 10 and the third battery cell 30, and the lower end of the first bus bar 40 is connected between the third battery string 31 and the fourth battery string 32. The third bypass diode 33 is connected to the first bus bar 40, and the third bypass diode 33 is located between two adjacent substrings 329. Thus, by providing the above-described first bus bar 40 and end bus bar a, the parallel connection of the third battery string 31 and fourth battery string 32 can be well achieved, the series connection between the first battery cell 10 and third battery cell 30 can be facilitated, and the third bypass diode 33 can be arranged on the first bus bar 40 to simultaneously bypass the realization of the third battery string 31 and fourth battery string 32.

Specifically, as shown in fig. 1 and 4, the first bus bar 40 includes a first sub-bus bar 41 and a second sub-bus bar 42, the first sub-bus bar 41 extending in the cell string extending direction, one end (e.g., the upper end in fig. 1) of the first sub-bus bar 41 being connected to one end (the end where the end bus bar a is located) of the first cell 10 and the two third cell strings 31 remote from the fourth cell string 32. The second sub bus bar 42 extends in the string arrangement direction, one end (e.g., the left end in fig. 1) of the second sub bus bar 42 is connected to the other end (e.g., the lower end in fig. 1) of the first sub bus bar 41, the other end (e.g., the right end in fig. 1) of the second sub bus bar 42 is connected to both the other ends of the two third battery strings 31 and both ends of the fourth battery string 32, and the third bypass diode 33 is connected in series to the second sub bus bar 42. Thus, by providing the first bus bar 40 as the first sub-bus bar 41 and the second sub-bus bar 42 described above, the layout of the first bus bar 40 in the photovoltaic module 100 is facilitated, and the structure is simple and easy to realize.

In some embodiments, referring to fig. 6 and 7, the second sub-bus bar 42 includes a first bus bar section 421 and a second bus bar section 422, the first bus bar section 421 extending in the string arrangement direction, and the other ends of the two third battery strings 31 and one end of the fourth battery string 32 are connected to the first bus bar section 421. The second bus bar 422 extends in the string arrangement direction, the second bus bar 422 is connected to the other end of the first sub bus bar 41 and the other end of the fourth battery string 32, and the third bypass diode 33 is connected between the second bus bar 422 and the first bus bar 421. The second bus bar 422 may overlap the first bus bar 421, and an insulating bar 423 is disposed between the second bus bar 422 and the first bus bar 421.

For example, as shown in fig. 6 and 7, the first bus bar section 421 connects one end of the fourth battery string 32, which is distant from the sub string 329 of the first sub bus bar 41, and the other ends of all the third battery strings 31, and the length of the first bus bar section 421 is substantially equal to the width of the third battery cells 30 in the string arrangement direction. The second bus bar 422 is connected between the first sub-bus bar 41 and the other end of the fourth battery string 32, the second bus bar 422 is disposed adjacent to the first sub-bus bar 41, and the length of the second bus bar 422 is substantially equal to the width of one of the two sub-strings 329 adjacent to the first sub-bus bar 41 in the string arrangement direction. Since the first and second bus bars 421 and 422 are stacked in the thickness direction of the battery sheet, in order to ensure the normal operation of the photovoltaic module 100, an insulating bar 423 is disposed between the first and second bus bars 421 and 422, and the third bypass diode 33 is connected between the first and second bus bars 421 and 422.

Thus, by providing the second sub-bus bar 42 including the above-described first and second bus bars 421 and 422, it is possible to effectively ensure that the third and fourth battery strings 31 and 32 are connected in parallel. Moreover, the first and second bus bars 421 and 422 are arranged in a stacked manner, and the insulating bars 423 are disposed between the first and second bus bars 421 and 422, and the stacked first and second bus bars 421 and 422 can reduce the occupation of the gaps between the third and fourth battery strings 31 and 32 and the size of the photovoltaic module 100 in the extending direction of the battery strings while ensuring the normal operation of the photovoltaic module 100.

Further, as shown in fig. 7, when the second bus bar 422 is overlapped with the first bus bar 421, the second bus bar 422 may be located at a side of the first bus bar 421 away from the fourth battery cell 321. The first bus bar 421 is located between the second bus bar 422 and the battery cell. So set up, because the length of first conflux section 421 in the direction of the cluster arrangement can be greater than the length of second conflux section 422 in the direction of the cluster arrangement, the third bypass diode 33 of being convenient for links to each other with first conflux section 421 and second conflux section 422.

Of course, the present invention is not limited thereto, and the second bus bar segment 422 may be spaced apart from at least a portion of the first bus bar segment 421 corresponding to the second bus bar segment 422 in the battery string extending direction, as shown in fig. 8 and 9. The portion of the first bus bar 421 adjacent to the first sub bus bar 41 and the second bus bar 422 are opposite to each other in the cell string extending direction, and a gap is provided between the first bus bar 421 and the second bus bar 422 to ensure the normal operation of the photovoltaic module 100.

Alternatively, as shown in connection with fig. 9, the width of the portion of the first bus bar section 421 corresponding to the second bus bar section 422 is smaller than the width of the remaining portion of the first bus bar section 421.

Alternatively, the first sub-bus bar 41 is located between the first battery cell 10 and the third battery cell 30, as shown in fig. 1 to 5. Thus, the arrangement of the first sub-bus bars 41 is facilitated, so that the cost can be reduced.

Alternatively, referring to fig. 3 and 5, the first sub-bus bar 41 is located at the rear surface of the corresponding plurality of third battery cells 311. Therefore, the size of the photovoltaic module 100 in the string arrangement direction can be reduced, the photovoltaic module 100 can be conveniently installed and transported, and the string gaps of the battery strings can be equal, so that the appearance of the whole photovoltaic module 100 is more attractive.

Or alternatively, in conjunction with fig. 1 and 2, the first sub-bus bar 41 is located in the string gap of the adjacent first and third battery strings 11 and 31. The first sub bus bar 41 may be spaced apart from the first battery tab 111 of the first battery string 11 and the third battery tab 311 of the third battery string 31 at the same time. By the arrangement, the utilization of the string gap between the adjacent first battery strings 11 and third battery strings 31 in the photovoltaic module 100 is improved, the situation of cracking of the battery pieces is not easy to occur, shielding of the battery pieces of the photovoltaic module 100 can be avoided, and the output power of the photovoltaic module 100 is improved.

Further, as shown in fig. 4 and 5, the photovoltaic module 100 further includes: the second bus bar 50 and the third bus bar 60, the second bus bar 50 extends in the string arrangement direction, the first battery cell 10 and the second battery cell 20 are connected in series by the second bus bar 50, and one end of the second bus bar 50 is connected with the first bus bar 40, the first bypass diode 12 is connected in series on the second bus bar 50, and the first bypass diode 12 is located between the first battery cell 10 and the first bus bar 40. The third bus bar 60 extends along the battery string extending direction, one end of the third bus bar 60 is connected to the second bus bar 50, the other end of the third bus bar 60 is connected to one end of the three second battery strings 21 of the second battery cells 20, which is remote from the second bus bar 50, and the second bypass diode 22 is connected in series to the third bus bar 60.

For example, in the example of fig. 4 and 5, a second bus bar 50 is provided between the first battery cell 10 and the second battery cell 20, three first battery strings 11 and three second battery strings 21 are connected in series by the second bus bar 50, and the right end of the second bus bar 50 adjacent to the first sub-bus bar 41 is connected to the first sub-bus bar 41 by the first bypass diode 12. The third bus bar 60 has an upper end connected to the second bus bar 50, and the third bus bar 60 has a lower end connected to one end of the three second battery strings 21 of the second battery cells 20, which is remote from the second bus bar 50, through the second bypass diode 22.

Thus, by providing the second bus bar 50 and the third bus bar 60, the first bypass diode 12 and the third bypass diode 33 can be disposed at the substantially middle position of the photovoltaic module 100 in the extending direction of the cell string, and when the photovoltaic module 100 is a double-glass module, the shielding area for the cell sheet can be reduced, and the output power of the photovoltaic module 100 can be increased. Furthermore, the first bypass diode 12 and the third bypass diode 33 may be disposed in the same junction box, which may reduce the number of junction boxes and reduce the cost of the photovoltaic module 100.

According to other embodiments of the present invention, as shown in fig. 1 to 3, the photovoltaic module 100 further includes a fourth bus bar 70, a fifth bus bar 80, and a sixth bus bar 90, the fourth bus bar 70 extending in the string arrangement direction, the fourth bus bar 70 being connected with a solder ribbon (not shown) between the first and second battery cells 10 and 20. The fifth bus bar 80 extends along the extending direction of the battery strings, one end of the fifth bus bar 80 is connected with the fourth bus bar 70, the other end of the fifth bus bar 80 is connected with one end, far away from the fourth bus bar 70, of the three first battery strings 11 of the first battery cells 10, and the first bypass diode 12 is connected with the fifth bus bar 80 to realize the antiparallel connection of the first bypass diode 12 and the first battery cells 10. The sixth bus bar 90 extends in the battery string extending direction, one end of the sixth bus bar 90 is connected to the fourth bus bar 70, the other end of the sixth bus bar 90 is connected to one end of the fourth battery string 32 of the second battery cell 20 remote from the fourth bus bar 70, and the second bypass diode 22 is connected to the sixth bus bar 90.

For example, in the example of fig. 1 to 3, three first battery strings 11 and three second battery strings 21 are connected in series through a fourth bus bar 70, the lower end of a fifth bus bar 80 is connected to the fourth bus bar 70, the upper end of the fifth bus bar 80 is connected to the upper ends of the three first battery strings 11, and a first bypass diode 12 is connected in series to the fifth bus bar 80. The sixth bus bar 90 is disposed opposite to the fifth bus bar 80 in the extending direction of the battery string, the upper end of the sixth bus bar 90 is connected to the fourth bus bar 70, the lower end of the sixth bus bar 90 is connected to the lower end of the fourth battery string 32, and the second bypass diode 22 is connected in series to the sixth bus bar 90.

Therefore, by arranging the fourth bus bar 70, the fifth bus bar 80 and the sixth bus bar 90, the circuit structure is simple, and the first bypass diode 12, the second bypass diode 22 and the third bypass diode 33 can be respectively located in a plurality of junction boxes, so that replacement of the bypass diodes is facilitated, and meanwhile, since one bypass diode is arranged in each junction box, the volume of the junction box is reduced, and thus the occupied space of the junction box can be reduced.

Alternatively, the number of the first battery cells 111 of the first battery string 11 is twice the number of the second battery cells 211 of the second battery string 21. At this time, since the first battery string 11 and the third battery string 31 may include the same number of battery pieces, and the second battery string 21 and the fourth battery string 32 may include the same number of battery pieces, the first battery string 11 and the third battery string 31 may include 2N/3 battery pieces, and the second battery string 21 and the fourth battery string 32 may include N/3 battery pieces. The length of the first battery string 11 in the battery string extending direction may be twice the length of the second battery string 21 in the battery string extending direction. Thus, by reasonably distributing the number of the first battery pieces 111 of the first battery string 11 and the second battery pieces 211 of the second battery string 21, the number of the third battery pieces 311 of the third battery string 31 of the third battery unit 30 can be made equal to the number of the fourth battery pieces 321 of the fourth battery string 32, so that the third bypass diode 33 can protect the same number of the third battery pieces 311 and the fourth battery pieces 321, and thus the power of the photovoltaic module 100 can be increased as much as possible.

Optionally, each cell (including the aforementioned first cell 111, second cell 211, third cell 311, and fourth cell 321) is one-M-th of a complete cell, where M satisfies: m is more than or equal to 3 and less than or equal to 6. For example, m=4. But is not limited thereto. At this time, the battery piece can be cut into 4 equal parts, and a plurality of 1/4 battery pieces are connected in series to form a battery string. Therefore, lower series resistance power loss can be brought, CTM (Cell To Module) of the photovoltaic Module 100 can be effectively improved, and power gain is brought. In addition, since the short-circuit current of the photovoltaic module 100 is low, the specification requirement on the bypass diode can be reduced, and thus the cost of the photovoltaic module 100 can be reduced. In addition, the photovoltaic module 100 has a moderate current, so that the matching of the inverter is high.

In the description of the present invention, it should be understood that the terms "length," "width," "thickness," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the invention, a "first feature" or "second feature" may include one or more of such features. In the description of the present invention, "plurality" means two or more. In the description of the invention, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween. In the description of the invention, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in multiple embodiments or examples of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many variations, modifications, adaptations, and variations of the embodiments may be made without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (12)

1. A photovoltaic module, comprising:

the first battery unit comprises three first battery strings, each first battery string comprises a plurality of first battery pieces which are arranged along the extending direction of the battery string, and the first battery units are reversely connected with first bypass diodes in parallel;

the second battery units are connected with the first battery units in series and are distributed along the extending direction of the battery strings, each second battery unit comprises three second battery strings, each second battery string comprises a plurality of second battery pieces distributed along the extending direction of the battery string, and the second battery units are reversely connected with a second bypass diode in parallel;

the third battery units are connected in series with the first battery units and are distributed along a string arrangement direction perpendicular to the extending direction of the battery strings, each third battery unit comprises two third battery strings and at least one fourth battery string, the two third battery strings and the fourth battery strings are connected in parallel and are distributed along the extending direction of the battery strings, each third battery string comprises a plurality of third battery pieces distributed along the extending direction of the battery strings, each fourth battery string comprises a plurality of fourth battery pieces distributed along the extending direction of the battery strings, and the third battery units are reversely connected in parallel with a third bypass diode;

along the extending direction of the battery strings, the number of the third battery pieces of the third battery string is 2 times that of the fourth battery string, the sum of the number of the third battery pieces of the third battery string and the number of the fourth battery string is N, and the N is an integer multiple of 3.

2. The photovoltaic module of claim 1, wherein N satisfies: n is more than or equal to 39 and less than or equal to 156.

3. The photovoltaic module according to claim 1, wherein two of the third cells are connected in series-parallel and arranged along the string arrangement direction;

the fourth battery string comprises two sub-strings, wherein the two sub-strings are connected in series and are arranged along the string arrangement direction.

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

the end bus bars are located at one ends, far away from the second battery units, of the first battery units and the third battery units along the extending direction of the battery strings, extend along the arrangement direction of the battery strings, are electrically connected with one ends of three of the first battery units, and are electrically connected with one ends of two of the third battery units so as to realize the serial connection of the first battery units and the third battery units.

And one end of the first bus bar is connected with the end bus bar, the other end of the first bus bar is connected with the other ends of the third battery strings and the fourth battery strings, and the third bypass diode is connected to the first bus bar.

5. The photovoltaic assembly of claim 4, wherein the first bus bar comprises:

a first sub-bus bar extending in a battery string extending direction, one end of the first sub-bus bar being connected to one end of the first battery cell and one end of the two third battery strings, which are far away from the fourth battery string;

the second sub-bus bar extends along the string arrangement direction, one end of the second sub-bus bar is connected with the other end of the first sub-bus bar, the other end of the second sub-bus bar is connected with the other ends of the third battery string and the two ends of the fourth battery string, and the third bypass diode is connected in series with the second sub-bus bar.

6. The photovoltaic assembly of claim 5, wherein the second sub-bus bar comprises:

the first bus section extends along the string arrangement direction, and the other ends of the two third battery strings and one end of the fourth battery string are connected with the first bus section;

a second bus section extending in a string arrangement direction, the second bus section being connected to the other end of the first sub-bus bar and the other end of the fourth battery string, the third bypass diode being connected between the second bus section and the first bus section,

the second bus section is overlapped with the first bus section, and an insulating strip is arranged between the second bus section and the first bus section; or (b)

The second bus section and at least the part of the first bus section corresponding to the second bus section are arranged at intervals along the extending direction of the battery string.

7. The photovoltaic assembly of claim 6, wherein the second bus bar segment is located on a side of the first bus bar segment that is remote from the fourth cell when the second bus bar segment overlaps the first bus bar segment.

8. The photovoltaic assembly of claim 5, wherein the first sub-bus bar is located between the first cell and the third cell.

9. The photovoltaic assembly of claim 5, wherein the first sub-bus bar is located on a back side of the corresponding plurality of third cells; or (b)

The first sub-bus bar is located in a string gap of the adjacent first and third battery strings.

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

a second bus bar extending in the string arrangement direction, the first battery cells and the second battery cells being connected in series by the second bus bar, and one end of the second bus bar being connected to the first bus bar, the first bypass diode being connected in series on the second bus bar and located between the first battery cells and the first bus bar;

and the third bus bar extends along the extending direction of the battery string, one end of the third bus bar is connected with the second bus bar, the other end of the third bus bar is connected with one ends, far away from the second bus bar, of the three second battery strings of the second battery unit, and the second bypass diode is connected in series with the third bus bar.

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

a fourth bus bar extending in the string arrangement direction, the fourth bus bar being connected with a solder strip between the first battery cell and the second battery cell;

a fifth bus bar extending along the extending direction of the battery strings, one end of the fifth bus bar being connected with the fourth bus bar, the other end of the fifth bus bar being connected with one end of the three first battery strings of the first battery unit, which is far away from the fourth bus bar, the first bypass diode being connected with the fifth bus bar to realize the antiparallel connection of the first bypass diode and the first battery unit;

and the sixth bus bar extends along the extending direction of the battery string, one end of the sixth bus bar is connected with the fourth bus bar, the other end of the sixth bus bar is connected with one end, far away from the fourth bus bar, of the fourth battery string of the second battery unit, and the second bypass diode is connected to the sixth bus bar.

12. The photovoltaic assembly of claim 1, wherein the number of the first cells of the first string is twice the number of the second cells of the second string, each of the cells being one-M-th of a complete cell, wherein the M satisfies: m is more than or equal to 3 and less than or equal to 6.

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