Photovoltaic power generation device

Abstract

The present invention discloses a photovoltaic power generation device, which relates to the technical field of solar cells. The photovoltaic power generation device includes a first photovoltaic component and a second photovoltaic component; the first photovoltaic component and the second photovoltaic component respectively include an odd number of solar cell strings connected in series, a first connector and a second connector; the first photovoltaic component also includes a first bypass diode, the first end of the solar cell string group at one side edge of the first photovoltaic component is connected to the first connector through the first bypass diode, and the second end is connected to the second connector; the first end of the solar cell string group at one side edge of the second photovoltaic component is connected to the second connector, and the second end is connected to the first connector; the first photovoltaic component and the second photovoltaic component are connected through the first connector and the second connector at one side edge. This implementation reduces the number of bypass diodes used in the photovoltaic component including an odd number of solar cell strings, and improves the power generation efficiency of the photovoltaic component.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular to a photovoltaic power generation device. Background Art

[0002] In order to ensure the safety of the internal circuit of the photovoltaic module, the solar cell string group in the photovoltaic module is generally connected in parallel with a bypass diode to prevent the cells in the solar cell string group from being burned due to the hot spot effect.

[0003] At present, in a photovoltaic module including an odd number of solar cell strings, each pair of solar cell strings is connected in parallel with a bypass diode, and the remaining solar cell string needs to be connected to a bypass diode in the form of a flying wire using an independent bus bar. In other words, in a photovoltaic module including an odd number of solar cell strings, one solar cell string inevitably needs to be connected in parallel with a bypass diode alone, which to a certain extent causes a waste of materials and increases the cost of the photovoltaic module. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a photovoltaic power generation device that can reduce the number of bypass diodes used in a photovoltaic module including an odd number of solar cell strings, thereby saving materials used in the photovoltaic module and reducing the cost of the photovoltaic module.

[0005] To achieve the above objective, according to one aspect of an embodiment of the present invention, a photovoltaic power generation device is provided.

[0006] A photovoltaic power generation device according to an embodiment of the present invention comprises: a first photovoltaic component and a second photovoltaic component; wherein:

[0007] The first photovoltaic assembly and the second photovoltaic assembly respectively include: an odd number of solar cell strings connected in series, a first connector and a second connector; the first connector and the second connector have opposite polarities;

[0008] The first photovoltaic assembly further includes a first bypass diode, and the first bypass diode is arranged at a first side edge of the first photovoltaic assembly;

[0009] In the first photovoltaic assembly, a first end of the solar cell string group at the first side edge is connected to the first connector through the first bypass diode, and a second end of the solar cell string group at the first side edge is connected to the second connector;

[0010] In the second photovoltaic assembly, two ends of the solar cell string group (14) at the second side edge are respectively connected to the first connector and the second connector; the first side edge and the second side edge are opposite to each other;

[0011] The first photovoltaic assembly and the second photovoltaic assembly are connected through the first connector and the second connector, so that the solar cell string group at one edge of the first photovoltaic assembly and the second photovoltaic assembly is connected in parallel with the first bypass diode.

[0012] Optionally, the first end of the solar cell string group at the second side edge of the second photovoltaic component is connected to the second connector, and the second end of the solar cell string group at the second side edge is connected to the first connector; the first end of the solar cell string group at the second side edge of the second photovoltaic component has opposite polarity to the first end of the solar cell string group at the first side edge of the first photovoltaic component.

[0013] Optionally,

[0014] The first photovoltaic assembly and the second photovoltaic assembly further include: a second bypass diode;

[0015] In other solar cell string groups in the first photovoltaic assembly except at the first side edge and in other solar cell string groups in the second photovoltaic assembly except at the second side edge, each pair of the solar cell string groups is connected in parallel with one second bypass diode.

[0016] Optionally,

[0017] The first bypass diode and the second bypass diode in the first photovoltaic assembly are located at the same end of the solar cell string group.

[0018] Optionally,

[0019] The second bypass diode at the second side edge of the first photovoltaic component is connected to the first connector;

[0020] The second bypass diode at the first side edge of the second photovoltaic assembly is connected to the second connector.

[0021] Optionally,

[0022] The first photovoltaic assembly and the second photovoltaic assembly further include: a junction box, a bus bar and a connecting wire respectively; wherein,

[0023] The first bypass diode and the second bypass diode are respectively arranged in the junction box;

[0024] The solar cell strings are connected via the busbars;

[0025] In the first photovoltaic assembly, the lead wire of the bus bar at the first end of the solar cell string group at the first side edge is connected to the first bypass diode; the junction box where the first bypass diode and the second bypass diode at the second side edge are located are respectively connected to the first connector through the connecting wire;

[0026] In the second photovoltaic assembly, the junction box where the second bypass diode is located at the first side edge is connected to the second connector through the connecting line.

[0027] Optionally,

[0028] In the first photovoltaic assembly, the lead wire of the bus bar at the second end of the solar cell string group at the first side edge is connected to the junction box, and the junction box is connected to the second connector via a connecting wire in the junction box;

[0029] In the second photovoltaic assembly, the lead wires of the busbars at both ends of the solar cell string group at the second side edge are respectively connected to the junction box, and the junction box is respectively connected to the second connector and the first connector through the connecting wires.

[0030] Optionally,

[0031] The first photovoltaic assembly and the second photovoltaic assembly respectively include the same number of solar cell strings.

[0032] Optionally,

[0033] The solar cell string group includes: one solar cell string or at least two solar cell strings connected in parallel with each other, and each of the solar cell strings includes: a plurality of solar cell sheets connected in series with each other.

[0034] Optionally,

[0035] The number of solar cell strings included in each of the solar cell string groups in the first photovoltaic assembly and the second photovoltaic assembly is the same.

[0036] One embodiment of the above invention has the following advantages or beneficial effects: the first end of the solar cell string group at the edge of one side of the first photovoltaic component is connected to the first connector through the first bypass diode, and the second end of the solar cell string group is connected to the second connector. In addition, the solar cell string group at the edge of one side of the second photovoltaic component does not need to be connected in parallel with a bypass diode separately, but only needs to connect the second connector and the first connector at both ends of the solar cell string group at the edge, so that the first photovoltaic component and the second photovoltaic component can be connected through the first connector and the second connector at the edge to form a photovoltaic power generation device. In the photovoltaic power generation device, the solar cell string group at the edge of the first photovoltaic component and the second photovoltaic component is connected in parallel with the first bypass diode, that is, the solar cell string group at the edge of the first photovoltaic component and the second photovoltaic component shares a first bypass diode. Thereby, the number of bypass diodes used in the photovoltaic component including an odd number of solar cell string groups is reduced, thereby saving the materials used in the photovoltaic component and reducing the cost of the photovoltaic component. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0038] Figure 1 is a schematic structural diagram of a first photovoltaic assembly according to an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of electrical connections of a first photovoltaic assembly according to an embodiment of the present invention;

[0040] Figure 3 is a schematic structural diagram of a second photovoltaic assembly according to an embodiment of the present invention;

[0041] Figure 4 is a schematic diagram of electrical connection of a second photovoltaic assembly according to an embodiment of the present invention;

[0042] Figure 5 is a structural schematic diagram of a connection method of a first photovoltaic component and a second photovoltaic component according to an embodiment of the present invention;

[0043] Figure 6 is an electrical schematic diagram of a connection method of a first photovoltaic component and a second photovoltaic component according to an embodiment of the present invention;

[0044] Figure 7 is a schematic structural diagram of another first photovoltaic assembly according to an embodiment of the present invention;

[0045] Figure 8 is another electrical connection schematic diagram of a first photovoltaic assembly according to an embodiment of the present invention;

[0046] Fig. 9 is a schematic structural diagram of another second photovoltaic assembly according to an embodiment of the present invention;

[0047] Fig.10 is another electrical connection schematic diagram of a second photovoltaic assembly according to an embodiment of the present invention;

[0048] Fig.11 is a structural schematic diagram of another connection method of a first photovoltaic assembly and a second photovoltaic assembly according to an embodiment of the present invention;

[0049] Fig.12 1 is an electrical schematic diagram of another connection method of a first photovoltaic component and a second photovoltaic component according to an embodiment of the present invention.

[0050] The reference numerals are as follows:

[0051] 10 Photovoltaic power generation device

[0052] 11. The first photovoltaic module

[0053] 12 Second photovoltaic module

[0054] 13 First bypass diode

[0055] 14, 14' Solar cell string

[0056] 15, 15' First connector

[0057] 16, 16' Second connector

[0058] 17, 17' Second bypass diode

[0059] 18, 18' Junction Box

[0060] 19, 19' bus bar

[0061] 20, 20' connecting line DETAILED DESCRIPTION

[0062] The details are described below.

[0063] like Figures 1 to 6 As shown, a photovoltaic power generation device 10 provided in an embodiment of the present invention mainly comprises: a first photovoltaic component 11 and a second photovoltaic component 12; wherein,

[0064] The first photovoltaic assembly 11 and the second photovoltaic assembly 12 respectively include: an odd number of solar cell strings 14, 14' connected in series, a first connector 15, 15' and a second connector 16, 16'; the first connector 15, 15' and the second connector 16, 16' have opposite polarities.

[0065] refer to Figure 1 and Figure 2 , the first photovoltaic assembly 11 further includes a first bypass diode 13, which is disposed at a first side edge of the first photovoltaic assembly 11; in the first photovoltaic assembly 11, a first end of a solar cell string group 14 at the first side edge is connected to the first connector 15 through the first bypass diode 13, and a second end of the solar cell string group 14 at the first side edge is connected to the second connector 16. Wherein, Figure 1 is a schematic structural diagram of the first photovoltaic module 11, Figure 2 is an electrical schematic diagram of the first photovoltaic component 11 .

[0066] refer to Figure 3 and Figure 4 , the first end of the solar cell string group 14' at the second side edge of the second photovoltaic assembly 12 is connected to the second connector 16', and the second end of the solar cell string group 14' at the second side edge is connected to the first connector 15'; the first end of the solar cell string group 14' at the second side edge of the second photovoltaic assembly 12 is opposite in polarity to the first end of the solar cell string group 14' at the first side edge of the first photovoltaic assembly 11. Figure 3 is a schematic structural diagram of the second photovoltaic assembly 12, Figure 4 is an electrical schematic diagram of the second photovoltaic assembly 12 .

[0067] like Figure 5 and Figure 6 As shown, the first photovoltaic component 11 and the second photovoltaic component 12 are connected through the first connector 15, 15' and the second connector 16, 16', so that the solar cell string group 14, 14' at one side edge of the first photovoltaic component 11 and the second photovoltaic component 12 is connected in parallel with the first bypass diode 13, thereby forming a photovoltaic power generation device 10.

[0068] According to the above embodiment, the first end of the solar cell string group 14 at the first side edge of the first photovoltaic component 11 is connected to the first connector 15 through the first bypass diode 13, and the solar cell string group 14' at the second side edge of the second photovoltaic component 12 does not need to be connected in parallel with a bypass diode separately. In the photovoltaic power generation device 10 formed by connecting the first photovoltaic component 11 and the second photovoltaic component 11, the solar cell string groups 14, 14' at the edges of the first photovoltaic component 11 and the second photovoltaic component 12 are connected in parallel with the first bypass diode 13, that is, the solar cell string groups 14, 14' at the edges of the first photovoltaic component 11 and the second photovoltaic component 12 share a first bypass diode 13. Therefore, compared with the prior art in which each photovoltaic component has a solar cell string group connected in parallel with a bypass diode separately, the photovoltaic power generation device 10 provided by the embodiment of the present invention reduces the number of bypass diodes used in the first photovoltaic component 11 and the second photovoltaic component 12, thereby saving the materials used in the photovoltaic components and reducing the cost of the photovoltaic components.

[0069] For example, when a photovoltaic module includes five solar cell strings, since each photovoltaic module has one solar cell string that needs to be connected in parallel with a bypass diode in the prior art, one photovoltaic module needs to be connected in parallel with three bypass diodes, and two photovoltaic modules need to be connected in parallel with six bypass diodes. Figure 5 and Figure 6 As shown, since the solar cell strings at the edge of one side of the first photovoltaic module 11 and the second photovoltaic module 12 can be connected in parallel with the same first bypass diode 13, when the first photovoltaic module 11 and the second photovoltaic module 12 each include 5 solar cell strings, the photovoltaic power generation device 10 composed of the first photovoltaic module 11 and the second photovoltaic module 12 only needs to be connected in parallel with 5 bypass diodes. Therefore, compared with the prior art, the number of bypass diodes used is reduced, thereby saving materials used in the photovoltaic module.

[0070] In addition, Figure 3 and Figure 4In the connection method shown, the solar cell string group 14' at the second side edge of the second photovoltaic component 12 can be connected to the first connector 15' and the second connector 16' in other ways. For example, the first end of the solar cell string group 14' at the second side edge of the second photovoltaic component 12 can be connected to the first connector 15', and the second end of the solar cell string group 14' at the second side edge is connected to the second connector 16'; the first end of the solar cell string group 14' at the second side edge of the second photovoltaic component 12 has the same polarity as the first end of the solar cell string group 14' at the first side edge of the first photovoltaic component 11. In this case, when the first photovoltaic component 11 and the second photovoltaic component 12 are connected, the first connectors 15, 15' and the second connectors 16, 16' on the diagonal line can be connected by another connecting line.

[0071] In a preferred embodiment of the present invention, in order to reduce the use of connecting wires and reduce the complexity of electrical connections, the second photovoltaic module 12 is used as follows: Figure 3 and Figure 4 The connection method shown is used to connect the solar cell string group and the connector.

[0072] Among them, Figure 1 and Figure 3 As shown, the first side edge of the first photovoltaic component 11 is opposite to the second side edge of the second photovoltaic component 12. For example, if the first side edge of the first photovoltaic component is its right side edge, then the second side edge of the second photovoltaic component 12 is its left side edge, so as to facilitate the connection between the first photovoltaic component 11 and the second photovoltaic component 12.

[0073] In addition, the first connector 15, 15' and the second connector 16, 16' of opposite polarity are respectively a positive connector and a negative connector. That is, when the first connector 15, 15' is a positive connector, the second connector 16, 16' is a negative connector. When the first connector 15, 15' is a negative connector, the second connector 16, 16' is a positive connector.

[0074] When the first connector 15, 15' and the second connector 16, 16' are respectively connected to the two ends of the solar cell group 14, the polarities of the first connector 15, 15' and the second connector 16, 16' are respectively the same as the polarities of the ends of the solar cell groups 14, 14'. The first end and the second end of the solar cell string group 14, 14' may be the upper end and the lower end of the solar cell string group 14, 14', respectively.

[0075] In one embodiment of the present invention, Figure 1 and Figure 3As shown, the first end of the solar cell group 14, 14' is its upper end, and the second end of the solar cell group 14, 14' is its lower end. The upper end of the solar cell group 14 at the first side edge of the first photovoltaic assembly 11 is the positive pole, which is connected to the positive pole connector through a junction box, and the lower end of the solar cell group 14 is the negative pole, which is connected to the negative pole connector through a junction box. Of course, if in another embodiment of the present invention, when the first end of the solar cell group 14 in the first photovoltaic assembly 11 is the negative pole, the first end is connected to the negative pole connector, and when the second end of the solar cell group 14 is the positive pole, the second end is connected to the positive pole connector.

[0076] like Figure 3 As shown, in the second photovoltaic assembly 12, the connection method of the first connector 15' and the second connector 16' is the same as the connection method in the first photovoltaic assembly 11. It is worth noting that, since the first photovoltaic assembly 11 and the second photovoltaic assembly 12 are connected through the first connector 15, 15' and the second connector 16, 16' at one side edge, the positive connector on the first photovoltaic assembly 11 is connected to the negative connector on the second photovoltaic assembly 12, and the negative connector on the first photovoltaic assembly 11 is connected to the positive connector on the second photovoltaic assembly 12. Therefore, in the second photovoltaic assembly 12, the polarity of the first end of the solar cell string group 14' at the second side edge is opposite to that of the first end of the solar cell string group 14' at the first side edge in the first photovoltaic assembly 11. Reference Figure 1 and Figure 3 , when the first end (upper end) of the solar cell string group 14 at the first side edge of the first photovoltaic component 11 is the positive pole, it is connected to the positive pole connector; then, the first end (upper end) of the solar cell string group 14' at the second side edge of the second photovoltaic component 12 is the negative pole, which is connected to the negative pole connector. Similarly, when the second end (lower end) of the solar cell string group 14 at the first side edge of the first photovoltaic component 11 is the negative pole, it is connected to the negative pole connector; then, the second end (lower end) of the solar cell string group 14' at the second side edge of the second photovoltaic component 12 is the positive pole, which is connected to the positive pole connector. The structural schematic diagram of the first photovoltaic component 11 and the second photovoltaic component 12 connected via the first connector 15 and the second connector 16 can be shown as follows. Figure 5 The corresponding electrical connection diagram is shown in Figure 6 As shown. Thus, the same end of the first photovoltaic component 11 and the second photovoltaic component 12 can be directly connected through two connectors with opposite polarities, which is simple to operate and easy to implement, and facilitates the assembly of the first photovoltaic component 11 and the second photovoltaic component 12 to form the photovoltaic power generation device 10. In addition, the length of the connection line between the first photovoltaic component 11 and the second photovoltaic component 12 can be shortened, further saving the materials used in the photovoltaic components.

[0077] In addition, in the first photovoltaic assembly 11 and the second photovoltaic assembly 12, except for the solar cell string groups 14, 14' at the above-mentioned one side edge, other solar cell string groups 14, 14' are connected in parallel with the second bypass diodes 17, 17', so as to protect the circuit safety of other solar cell string groups 14, 14' through the second bypass diodes 17, 17'. That is to say, the first photovoltaic assembly 11 and the second photovoltaic assembly 12 also include second bypass diodes 17, 17' respectively; in other solar cell string groups 14, 14' in the first photovoltaic assembly 11 except at the first side edge and in the second photovoltaic assembly 12 except at the second side edge, each pair of the solar cell string groups 14, 14' is connected in parallel with one second bypass diode 17, 17'.

[0078] The first side edge of the first photovoltaic component 11 is opposite to the second side edge of the second photovoltaic component 12. For example, if the first side edge of the first photovoltaic component is its right side edge, then the second side edge of the second photovoltaic component 12 is its left side edge, so as to facilitate the connection between the first photovoltaic component 11 and the second photovoltaic component 12.

[0079] Continue to refer Figure 1 , the first photovoltaic assembly 11 includes 5 solar cell string groups 14, wherein the upper end of the solar cell string group 14 located at the right edge (i.e., the 5th solar cell string group from the left) is connected to the first bypass diode 13. In the other 4 solar cell string groups 14 in the first photovoltaic assembly 11 except the right edge, each pair of solar cell string groups 14 is connected in parallel with a second bypass diode 17. Specifically, the first and second solar cell string groups 14 from the left in the first photovoltaic assembly 11 are connected to a second bypass diode 17, and the third and fourth solar cell string groups 14 from the left are connected to another second bypass diode 17.

[0080] Similarly, refer to Figure 3 , the second photovoltaic assembly 12 also includes 5 solar cell string groups 14', among which the solar cell string group 14' located at the left edge (i.e., the first solar cell string group from the left) is the solar cell string group connected to the first photovoltaic assembly 11. In the second photovoltaic assembly 12, except for the other 4 solar cell string groups 14' at the left edge, each pair of solar cell string groups 14' is also connected in parallel with a second bypass diode 17'. Specifically, the second and third solar cell string groups 14' from the left in the second photovoltaic assembly 12 are connected to a second bypass diode 17', and the fourth and fifth solar cell string groups 14' from the left are connected to another second bypass diode 17'.

[0081] from Figure 1 and Figure 3It can also be seen that the first side edge of the first photovoltaic component 11 and the second side edge of the second photovoltaic component 12 are opposite to each other on the left and right. For example, in the first photovoltaic component 11, the first side edge connected to the first bypass diode 13 is its right edge, and in the second photovoltaic component 12, the second side edge connected to the first photovoltaic component 11 is its left edge. Thus, adopting the left-right relative manner facilitates the connection between the first photovoltaic component 11 and the second photovoltaic component 12, and further facilitates the sharing of the first bypass diode 13 by the solar cell string group 14 on the right edge of the first photovoltaic component 11 and the solar cell string group 14' on the left edge of the second photovoltaic component 12. The structural schematic diagram of the first photovoltaic component 11 and the second photovoltaic component 12 connected by the first connector 15, 15' and the second connector 16, 16' can be shown as follows. Figure 5 The corresponding electrical connection diagram is shown in Figure 6 shown.

[0082] It can be understood that the structures and functions of the first bypass diode 13 and the second bypass diode 17, 17' described in the above embodiment are the same, and the main difference between the two is that the positions of the first bypass diode 13 and the second bypass diode 17, 17' in the photovoltaic module are different. Among them, the first bypass diode 13 refers to the bypass diode connected to the solar cell string group 14 at the first side (right side) edge of the first photovoltaic module 11, and the solar cell string group at the side edge can be connected to the solar cell string group 14' at the second side edge of the second photovoltaic module 12 through a connector. In other words, the first bypass diode 13 is a bypass diode commonly connected to the solar cell string group 14 at the first side edge of the first photovoltaic module 11 and the solar cell string group 14' at the second side edge of the second photovoltaic module 12. The second bypass diode 17, 17' refers to the bypass diodes connected to the other solar cell string groups 14, 14' except the first side edge in the first photovoltaic module 11 and the other solar cell string groups 14, 14' except the second side edge in the second photovoltaic module 12.

[0083] In one embodiment of the present invention, the first bypass diode 13 and the second bypass diode 17, 17' are located at the same end of the solar cell string group 14, 14'. Figure 1 and Figure 2 As shown, the first bypass diode 13 and the second bypass diode 17 are both located at the upper end of the first photovoltaic module 11. Therefore, the first bypass diode 13 and the solar cell string group can be directly connected at the first end of the solar cell string group 14 at one side edge of the first photovoltaic module 11 by using a bus bar without using a flying wire. Compared with the prior art that uses a flying wire to connect a bypass diode alone, not only the bypass diodes are reduced, but also the length of the connection wire inside the photovoltaic module is shortened.

[0084] Furthermore, because the prior art uses flying wires to individually connect bypass diodes in parallel, the individually connected bypass diodes are designed diagonally with other bypass diodes, so that the bus bar in the flying wire form is generally located between the solar cell group at one edge and the adjacent solar cell group. This method relatively increases the area of ​​the photovoltaic module and reduces the power generation efficiency of the photovoltaic module.

[0085] In the embodiment of the present invention, since there is no need to use a flying wire to connect the bypass diode, in the first photovoltaic module 11, there is no longer a flying wire bus bar (such as Figure 1 As shown), the spacing between the solar cell group 14 at the first side edge and its adjacent solar cell group is reduced, so that when the number of solar cell string groups 14 is the same, the area of ​​the first photovoltaic component 11 is reduced, thereby improving the power generation efficiency of the first photovoltaic component 11.

[0086] In addition, in the second photovoltaic assembly 12, since there is no need to connect a bypass diode in parallel at the second side edge thereof, there is no flying wire bus bar (such as Figure 3 As shown), when the number of solar cell strings 14' is the same, the power generation efficiency of the second photovoltaic assembly 12 is also improved.

[0087] In addition, if Figures 1 to 4 In one embodiment of the present invention, the second bypass diode 17 at the second side edge of the first photovoltaic component 11 is connected to the first connector 15; the second bypass diode 17' at the first side edge of the second photovoltaic component 12 is connected to the second connector 16'.

[0088] In this example, the second side edge of the first photovoltaic component 11 is its left edge, and the upper end of the solar cell string group at the left edge is the positive pole, then the second bypass diode 17 at the left edge of the first photovoltaic component 11 is connected to the positive pole connector. Correspondingly, the first side edge of the second photovoltaic component 12 is its right edge, and the upper end of the solar cell string group at the right edge is the negative pole, then the second bypass diode 17' at the right edge of the second photovoltaic component 12 is connected to the negative pole connector. Thus, through the connector connected to the left edge of the first photovoltaic component 11 and the right edge of the second photovoltaic component 12, it is convenient for the photovoltaic power generation device formed by the connection of the first photovoltaic component 11 and the second photovoltaic component 12 to be connected to the external cable.

[0089] In one embodiment of the present invention, the first photovoltaic assembly 11 and the second photovoltaic assembly 12 further include: a junction box 18, 18', a bus bar 19, 19' and a connecting line 20, 20'; wherein the first bypass diode 3 and the second bypass diode 17, 17' are respectively arranged in the junction box 18, 18'; the solar cell string groups 14, 14' are connected through the bus bars 19, 19'.

[0090] Continue to refer Figure 1 In the first photovoltaic module 11, the lead wire of the bus bar 19 at the first end of the solar cell string group 14 at the first side edge is connected to the first bypass diode 13; the first bypass diode 13 and the second bypass diode 17 at the second side edge are respectively connected to the first connector 15 through a connecting wire 20. One end of the connecting wire 20 is connected to the first connector 15, and the other end is connected to the junction box 18 where the first bypass diode 13 is located. Correspondingly, the lead wire of the bus bar 19 at the second end of the solar cell string group 14 at the first side edge of the first photovoltaic module 11 is connected to the junction box 18, and is connected to the second connector 16 through the connecting wire 20. One end of the connecting wire 20 is connected to the second connector 16, and the other end is connected to the junction box 18.

[0091] In this embodiment, the first end (upper end) of the solar cell string group 14 at the right edge of the first photovoltaic module 11 is connected to the first bypass diode 13 through the lead-out line of the bus bar 19. Since the upper end of the solar cell string group 14 is the positive electrode, the bus bar 19 connected to the upper end of the solar cell string group 14 is connected to the negative electrode of the first bypass diode 13 through the positive lead-out line. The first bypass diode 13 is arranged in the junction box 18, and the junction box 18 is provided with a connecting line, so that the first bypass diode 13 can be connected to the positive electrode connector through the connecting line 20 in the junction box 18. Similarly, the second end (lower end) of the solar cell string group 14 at the edge of one side of the first photovoltaic module 11 can be connected to the junction box 18 through the negative bus bar lead-out line, and then connected to the negative electrode connector through the connecting line 20 in the junction box 18.

[0092] Similarly, the first end (upper end) of the solar cell string group 14 at the left edge of the first photovoltaic component 11 is connected to the second bypass diode 17 through the lead-out line of the bus bar 19. Since the upper end of the solar cell string group 14 is the positive electrode, the bus bar 19 connected to the upper end of the solar cell string group 14 is connected to the negative electrode of the second bypass diode 17 through the positive bus bar lead-out line. The second bypass diode 17 is arranged in a junction box 18, and a connecting line 20 is arranged in the junction box 18, so that the second bypass diode 17 can be connected to the positive connector through the connecting line 20 in the junction box 18.

[0093] Similar to the connection method in the first photovoltaic assembly 11, in the second photovoltaic assembly 12, the junction box 18' where the second bypass diode 17' is located at the first side edge is connected to the second connector 16' through a connecting line 20'. The lead wires of the busbar 19' at both ends of the solar cell string group 14' at the second side edge are respectively connected to the junction box 18', and the junction box 18' is respectively connected to the second connector 16' and the first connector 15' through the connecting line 20'. The specific connection diagram is as follows: Figure 3 shown.

[0094] exist Figure 3 In the embodiment, the second bypass diode 17' on the right edge of the second photovoltaic assembly 12 is arranged in the junction box 18', and since the first end (upper end) of the solar cell string group 14' on the right edge of the second photovoltaic assembly 12 is a negative electrode, the positive electrode of the second bypass diode 17' is connected to the negative electrode lead-out line of the bus bar 19' at the upper end of the solar cell string group 14' on the right edge. In addition, the lead-out lines of the bus bar 19' at both ends of the solar cell string group 14' on the left edge of the second photovoltaic assembly 12 are also connected to the junction box 18' respectively, and since the upper end of the solar cell string group 14' on the left edge is a negative electrode, the bus bar 19' at the upper end is connected to the junction box 18' through the negative electrode lead-out line, and is connected to the negative electrode connector through the connection line 20' of the junction box 18'. Correspondingly, the lower end of the solar cell string group 14' on the left edge is the positive pole, so the bus bar 19' at the lower end is connected to the junction box 18' through the positive lead wire, and is connected to the positive connector through the connection wire 20' of the junction box 18'.

[0095] According to the above embodiment, each solar cell string group is connected by a bus bar, and the bus bar lead wire is connected to the junction box, and connected to the connector through the junction box, thereby facilitating the conduction of the current generated by the photovoltaic assembly and facilitating the connection of the photovoltaic assembly with the external circuit.

[0096] As described above, the first photovoltaic assembly 11 and the second photovoltaic assembly 12 provided in the embodiment of the present invention include an odd number of solar cell strings 14, 14'. That is, the first photovoltaic assembly 11 and the second photovoltaic assembly 12 may include 1, 3 or more than 3 solar cell strings 14, 14' respectively.

[0097] When the first photovoltaic assembly 11 and the second photovoltaic assembly 12 each include one solar cell string group, the photovoltaic power generation device 10 formed by connecting the first photovoltaic assembly 11 and the second photovoltaic assembly 12 only needs to be connected in parallel with one first bypass diode. Of course, in practical applications, in order to ensure the stability of the output voltage of the photovoltaic assembly and improve the power generation efficiency of the photovoltaic assembly, a photovoltaic assembly generally includes at least three solar cell string groups. In other words, in the embodiment of the present invention, the first photovoltaic assembly 1 and the second photovoltaic assembly 2 respectively include at least three solar cell string groups 14, 14'.

[0098] Furthermore, in order to facilitate the production of photovoltaic modules and the assembly of the photovoltaic power generation device 10, the first photovoltaic module 11 and the second photovoltaic module 12 respectively include the same number of solar cell strings 14, 14'. Figures 1 to 4 As shown, the first photovoltaic assembly 11 and the second photovoltaic assembly 12 include five solar cell string groups 14, 14', respectively. Of course, the number of solar cell string groups 14, 14' included in the first photovoltaic assembly 11 and the second photovoltaic assembly 12 may also be different. For example, the first photovoltaic assembly 11 includes five solar cell string groups 14, and the second photovoltaic assembly 12 includes seven solar cell string groups 14'.

[0099] Each solar cell string group 14, 14' in the first photovoltaic assembly 11 and the second photovoltaic assembly 12 may include a solar cell string or at least two solar cell strings connected in parallel, and each solar cell string includes: a plurality of solar cells connected in series. The solar cell may be a sliced ​​solar cell.

[0100] For the case where each solar cell string group 14, 14' in the first photovoltaic assembly 11 and the second photovoltaic assembly 12 includes one solar cell string, reference can be made to Figures 1 to 4 In this example, a solar cell string group 14, 14' is a solar cell string, and each solar cell string includes 10 solar cells.

[0101] In another embodiment of the present invention, reference Figures 7 to 12 The first photovoltaic module 11 and the second photovoltaic module 12 respectively include five solar cell strings 14, 14', and each solar cell string group 14, 14' includes two solar cell strings connected in parallel. Figure 7 and Figure 8 As shown, the first photovoltaic assembly 11 includes 5 solar cell string groups, each solar cell string group 14 includes two solar cell strings connected in parallel, and each solar cell string includes 9 solar cells. Fig. 9 and Fig.10The second photovoltaic assembly 12 also includes five solar cell string groups. Each solar cell string group 14' includes two solar cell strings connected in parallel. Each solar cell string includes nine solar cells.

[0102] When the solar cell string group 14, 14' includes a plurality of solar cell strings connected in parallel, the number of solar cell strings included in each of the solar cell string groups 14, 14' in the first photovoltaic assembly 11 and the second photovoltaic assembly 12 is the same. Figure 7 and Figure 8 In the embodiment, each solar cell string group 14 in the first photovoltaic assembly 11 includes two solar cell strings, and the number of solar cell strings is 2; Fig. 9 and Fig.10 In the embodiment, each solar cell string group 14 ′ in the second photovoltaic assembly 12 includes two solar cell strings, and the number of solar cell strings is also 2. This ensures that the output current of each solar cell string is the same, so as to ensure the circuit safety of the first photovoltaic assembly 11 and the second photovoltaic assembly 12 .

[0103] It can be understood that, whether the solar cell string group 14, 14' includes only one solar cell string or includes multiple solar cell strings connected in parallel, the connection between the solar cell string group 14 at one edge of the first photovoltaic module 11 and the first bypass diode 13, the connection between the other solar cell string groups 14 outside the one edge and the second bypass diode 17, the connection between the other solar cell string groups 14' outside the one edge of the second photovoltaic module 12 and the second bypass diode 17', and the first photovoltaic module 11 and the second photovoltaic module 12 are all the same. Therefore, if Figures 7 to 12 The solar cell groups 14, 14' shown in the figure include two solar cell strings connected in parallel. The connection method thereof can refer to the above description for the solar cell groups 14, 14' including only one solar cell string (eg Figures 1 to 6 As shown), no further description is given here.

[0104] In summary, according to the technical solution of the embodiment of the present invention, at least the following beneficial effects can be achieved:

[0105] 1. The first end of the solar cell string group at the edge of one side of the first photovoltaic component is connected to the first connector through the first bypass diode, and the second end of the solar cell string group is connected to the second connector. In addition, the solar cell string group at the edge of one side of the second photovoltaic component does not need to be connected in parallel with a bypass diode separately, but only needs to connect the second connector and the first connector at both ends of the solar cell string group at the edge, so that the first photovoltaic component and the second photovoltaic component can be connected through the first connector and the second connector at the edge to form a photovoltaic power generation device. In the photovoltaic power generation device, the solar cell string group at the edge of the first photovoltaic component and the second photovoltaic component is connected in parallel with the first bypass diode, that is, the solar cell string group at the edge of the first photovoltaic component and the second photovoltaic component shares a first bypass diode. Thereby reducing the number of bypass diodes used in the photovoltaic component including an odd number of solar cell string groups, thereby saving the materials used in the photovoltaic component and reducing the cost of the photovoltaic component.

[0106] 2. The same end of the first photovoltaic component and the second photovoltaic component is connected by two connectors with opposite polarities, which is simple to operate and easy to implement, and facilitates the assembly of the first photovoltaic component and the second photovoltaic component 12 to form a photovoltaic power generation device. It can also shorten the length of the connecting line between the first photovoltaic component and the second photovoltaic component, further saving the materials used in the photovoltaic components.

[0107] 3. In the first photovoltaic module and the second photovoltaic module, there is no need to use a flying wire bus bar to separately connect the bypass diode in parallel, which not only shortens the length of the connecting wires inside the first photovoltaic module and the second photovoltaic module, but also reduces the area of ​​the first photovoltaic module and the second photovoltaic module, thereby improving the power generation efficiency of the first photovoltaic module and the second photovoltaic module.

[0108] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic power generation device (10), characterized in that: include: A first photovoltaic module (11) and a second photovoltaic module (12); wherein: The first photovoltaic component (11) and the second photovoltaic component (12) respectively comprise: an odd number of solar cell string groups (14, 14') connected in series, a first connector (15, 15') and a second connector (16, 16'); the polarities of the first connector (15, 15') and the second connector (16, 16') are opposite; wherein the first photovoltaic component (11) and the second photovoltaic component (12) respectively comprise the same number of solar cell string groups (14, 14'); the solar cell string groups (14, 14') comprise: one solar cell string or at least two solar cell strings connected in parallel, each solar cell string comprising: a plurality of solar cell sheets connected in series; The first photovoltaic component (11) further comprises a first bypass diode (13), wherein the first bypass diode (13) is arranged at a first side edge of the first photovoltaic component (11); In the first photovoltaic assembly (11), the first end of the solar cell string group (14) at the first side edge is connected to the first connector (15) via the first bypass diode (13), and the second end of the solar cell string group (14) at the first side edge is connected to the second connector (16); In the second photovoltaic assembly (12), two ends of the solar cell string group (14') at the second side edge are respectively connected to the first connector (15') and the second connector (16'); the first side edge and the second side edge are opposite to each other; The first photovoltaic assembly (11) and the second photovoltaic assembly (12) are connected via the first connector (15, 15') and the second connector (16, 16'), so that the solar cell string group (14, 14') at one side edge of the first photovoltaic assembly (11) and the second photovoltaic assembly (12) is connected in parallel with the first bypass diode (13).

2. The photovoltaic power generation device (10) according to claim 1, characterized in that: The first end of the solar cell string group (14') at the second side edge of the second photovoltaic component (12) is connected to the second connector (16'), and the second end of the solar cell string group (14') at the second side edge is connected to the first connector (15'); the first end of the solar cell string group (14') at the second side edge of the second photovoltaic component (12) has opposite polarity to the first end of the solar cell string group (14) at the first side edge of the first photovoltaic component (11).

3. The photovoltaic power generation device (10) according to claim 1, characterized in that: The first photovoltaic assembly (11) and the second photovoltaic assembly (12) further include: a second bypass diode (17, 17'); In other solar cell string groups (14, 14') in the first photovoltaic component (11) except at the first side edge and in other solar cell string groups (14, 14') in the second photovoltaic component (12) except at the second side edge, each pair of the solar cell string groups (14, 14') is connected in parallel with one of the second bypass diodes (17, 17').

4. The photovoltaic power generation device (10) according to claim 3, characterized in that: The first bypass diode (13) and the second bypass diode (17) in the first photovoltaic assembly (11) are located at the same end of the solar cell string group (14).

5. The photovoltaic power generation device (10) according to claim 3, characterized in that: The second bypass diode (17) at the second side edge of the first photovoltaic component (11) is connected to the first connector (15); The second bypass diode (17') at the first side edge of the second photovoltaic component (12) is connected to the second connector (16').

6. The photovoltaic power generation device (10) according to claim 3, characterized in that: The first photovoltaic assembly (11) and the second photovoltaic assembly (12) further comprise: a junction box (18, 18'), a bus bar (19, 19') and a connecting wire (20, 20'); wherein: The first bypass diode (13) and the second bypass diode (17, 17') are respectively arranged in the junction box (18, 18'); The solar cell string groups (14, 14') are connected via the bus bars (19, 19'); In the first photovoltaic assembly (11), the lead wire of the bus bar (19) at the first end of the solar cell string group (14) at the first side edge is connected to the first bypass diode (13); the junction box (18) where the first bypass diode (13) and the second bypass diode (17) at the second side edge are located is respectively connected to the first connector (15) via the connecting wire (20); In the second photovoltaic assembly (12), the junction box (18') where the second bypass diode (17') at the first side edge is located is connected to the second connector (16') via the connecting line (20').

7. The photovoltaic power generation device (10) according to claim 6, characterized in that: In the first photovoltaic assembly (11), the lead wire of the bus bar (19) at the second end of the solar cell string group (14) at the first side edge is connected to the junction box (18), and the junction box (18) is connected to the second connector (16) via the connecting wire (20); In the second photovoltaic assembly (12), lead wires of the busbars (19') at both ends of the solar cell string group (14') at the second side edge are respectively connected to the junction box (18'), and the junction box (18') is respectively connected to the second connector (16') and the first connector (15') via the connection wires (20').

8. The photovoltaic power generation device (10) according to claim 1, characterized in that: The number of solar cell strings included in each of the solar cell string groups (14, 14') in the first photovoltaic assembly (11) and the second photovoltaic assembly (12) is the same.

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