CN113130688A

CN113130688A - Photovoltaic module

Info

Publication number: CN113130688A
Application number: CN201911420465.1A
Authority: CN
Inventors: 潘秀娟; 董经兵; 许涛
Original assignee: CSI Cells Co Ltd; Atlas Sunshine Power Group Co Ltd
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16

Abstract

The invention discloses a photovoltaic module, which comprises: the battery pack comprises 2N +1 battery packs connected in series, each battery pack comprises two battery strings connected in parallel, and each battery string comprises a plurality of battery pieces which are connected in series and equal in number; the battery string and the short side of the assembly are arranged in parallel, the battery piece is a third battery piece formed by cutting the whole battery piece, the long side of the battery piece is parallel to the long side direction of the assembly, and N is a positive integer. The photovoltaic module avoids damage caused by overhigh current of the module.

Description

Photovoltaic module

Technical Field

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

Background

With the development of photovoltaic cell module technology, the market demand for high power modules is continuously increasing, and besides the use of new technology of cells, the size of the cells is increased, which gradually becomes a shortcut for rapidly increasing the power and efficiency of the modules.

In the related art, the maximum size of the battery piece has been changed from 157mm to 210mm, but the challenges of the large-size battery piece to the module end have gradually increased, for example, the module current has increased to 1.8 times of the existing battery, which is different from the existing module, and is easy to cause impact on the existing system, and as the battery piece becomes larger, if the number of battery pieces or strings of the original conventional module is still maintained, the module width is too wide, for example, according to the existing half-piece symmetric structure, the width of 6 strings of battery modules has exceeded 1.3m, but the module width is far beyond the process capability of the glass manufacturers and other original material manufacturers on the market.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention is directed to a photovoltaic module, which can avoid damage caused by too high current of the module.

In order to solve the above problem, an embodiment of the present invention provides a photovoltaic module, including: the battery pack comprises 2N +1 battery packs connected in series, each battery pack comprises two battery strings connected in parallel, and each battery string comprises a plurality of battery pieces which are connected in series and equal in number; all the battery strings are arranged in parallel with the short edge direction of the assembly, the battery piece is one third of battery pieces formed by cutting the whole battery piece, and N is a positive integer.

According to the photovoltaic module provided by the embodiment of the invention, one third of the battery pieces formed by cutting the whole battery piece are adopted, the internal resistance of the module can be reduced, the internal loss of the module is reduced, and the current reduction caused by the connection of the cut battery pieces can be recovered by connecting the two adjacent batteries in series and parallel to form the battery pack, namely by a parallel connection method, but the output current of the module is still lower than that of the module connected by the whole battery piece, so that along with the increase of the size of the battery piece, the output power of the module can be improved, and the impact of the overhigh current on the module can be avoided.

In some embodiments, the number of battery packs is five, and the number of battery slices in each battery string is fifteen one-third battery slices. Aiming at the large-size battery piece, the width of the component can be reduced under the condition of ensuring the output power of the component, and the difficulty of the front plate manufacturing process of the component is reduced.

In some embodiments, the 1 st battery pack to the 2 nth battery pack are connected with a first bypass diode in parallel in a reverse direction between every two adjacent battery packs, and the 2N +1 th battery pack and the 2 nth battery pack are connected with a second bypass diode in parallel in a reverse direction between them, so that the arrangement of diodes is facilitated, the number of bypass diodes used is reduced, and the cost is reduced.

In some embodiments, N of the first bypass diodes are disposed at a first end of the panel, and the second bypass diode is disposed at a second end of the panel, the first end of the panel being opposite the second end.

In some embodiments, the second bypass diode is arranged in one junction box, and the N first bypass diodes are arranged in at least one junction box, so that the number of the junction boxes can be reduced, and the cost can be reduced.

In some embodiments, N of said first bypass diodes are disposed at a first end of said panel; 2N +1 it has the lead wire busbar to draw forth the negative pole end of group battery, the second bypass diode passes through the lead wire busbar sets up the first end of panel to avoid the terminal box at two sides, especially to two-sided two glass class subassembly, do benefit to and improve two-sided rate and reliability.

In some embodiments, the N first bypass diodes and the N second bypass diodes are disposed in at least one junction box, so that the number of the junction boxes used can be reduced, and the cost can be reduced.

In some embodiments, the size of the entire cell sheet is 210 mm.

In some embodiments, the battery strings in five of the battery packs are arranged in parallel with a pack short side direction to form the battery panel; and a first bypass diode is connected between the first battery pack and the second battery pack in parallel, a first bypass diode is connected between the third battery pack and the fourth battery pack in parallel, and a second bypass diode is connected between the fourth battery pack and the fifth battery pack in parallel.

In some embodiments, two of the first bypass diodes and the second bypass diode are respectively disposed in one junction box.

In some embodiments, two of the first bypass diodes are disposed in one junction box and the second bypass diode is disposed in one junction box.

In some embodiments, two of the first bypass diodes are disposed at a first end of the panel, and the second bypass diode is disposed at the first end of the panel through a lead bus bar; two of the first bypass diodes and the second bypass diode are disposed in at least one junction box.

In some embodiments, at least one bypass diode is connected to the common junction box by edge bus bars, the edge bus bars having overlapping regions, and an insulating bar is disposed between the edge bus bars of the overlapping regions, the insulating bar covering at least the overlapping regions to avoid short circuit, current leakage, and the like.

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

Drawings

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

FIG. 1 is a schematic view of a photovoltaic module according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a panel of a junction box arrangement in a photovoltaic module according to one embodiment of the present invention;

fig. 3 is a schematic diagram of a panel provided with a junction box in a photovoltaic module according to another embodiment of the invention.

Reference numerals:

a battery panel 10; a battery pack 1; a battery string 2; a battery piece 3; a first bypass diode 4; a second bypass diode 5; a junction box 6; and a lead bus bar 7.

Detailed Description

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

In order to solve the above problems, a photovoltaic module according to an embodiment of the present invention, which can prevent damage due to excessive current of the module, is described below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a photovoltaic module according to an embodiment of the present invention, and as shown in fig. 1, the photovoltaic module includes a cell panel 10, the cell panel 10 includes 2N +1 cell groups 1 connected in series, each cell group 1 includes two cell strings 2 connected in parallel, each cell string 2 includes a plurality of cell pieces 3 connected in series and equal in number, where the cell strings 2 are arranged in parallel with a short side direction of the photovoltaic module, the cell pieces 3 are one-third of the whole cell pieces, and N is a positive integer.

Wherein, the photovoltaic module of the embodiment of the invention adopts one third of the battery plates, compared with the whole battery plate, the internal loss of the photovoltaic module can be reduced, and the two battery strings 2 are connected in parallel, the voltage reduction caused by adopting one third of the battery plates can be avoided, so as to ensure the output power of the photovoltaic module, namely, when the size of the battery plate is increased, the purpose of improving the power of the module can be still achieved, furthermore, the one third of the battery plates is adopted, so that the output current of each battery string 2 is reduced, and then the battery strings 2 are connected in parallel, so that the current reduction caused by connecting one third of the battery plates can be recovered, but the output current of the module is still lower than the current of the module connected by adopting the whole battery plate, therefore, when the size of the battery plate is increased, the power of the module is improved, the current of the photovoltaic module can not be greatly increased, and the power loss of the component is reduced, so that the impact on the photovoltaic component caused by overhigh current is avoided.

In the embodiment, with respect to the laying direction of the battery string 2, in the circuit module of the symmetrical structure, the battery string is laid in such a manner as to be placed parallel to the long side of the module, in the photovoltaic module according to the embodiment of the present invention, as shown in fig. 1, all the cell strings 2 are disposed parallel to the short side of the module, the long side of one-third cell piece 3 is parallel to the long side of the module, namely, the battery plates are arranged in a horizontal row mode, so that the battery plates 10 do not need to be arranged according to two parts which are symmetrical up and down, the circuit connection is simpler, if the number of the battery pieces or the number of the battery strings of the original conventional assembly is still kept, the invention can reduce the width of the assembly on the premise of ensuring the competitive power of the photovoltaic assembly, thereby solving the problem that the raw materials such as glass and the like can not be supplied, and simultaneously, because all battery strings 2 are arranged in parallel along the same direction, complex jumper laying can be reduced, and the component manufacturing process is facilitated to be simplified.

It should be noted that the number of the battery packs 1 in the photovoltaic module provided by the present invention can be adjusted according to the number of the battery pieces 3 or the width of the module, and is not limited as the case may be.

According to the photovoltaic module provided by the embodiment of the invention, through a circuit processing mode of cutting three and two, namely, adopting the one third cell piece 3 formed by cutting the whole cell piece to reduce the internal resistance of the module and reduce the internal loss of the module, and connecting the two adjacent cell strings 2 in parallel to form the battery pack 1, compared with the circuit of the whole cell piece, the output current of each cell string 2 is reduced, and then the two cell strings 2 are connected in parallel, the current reduction caused by the connection of the one third cell piece can be recovered, but the output current of the module is still lower than the current of the module connected by the whole cell piece, so that the increase amplitude of the module current is reduced and the impact of the current on the module is avoided by increasing the size of the cell piece, and meanwhile, all the cell strings are arranged in parallel along the short edge of the module, the photovoltaic module is characterized in that the photovoltaic module is provided with a plurality of photovoltaic modules, the photovoltaic modules are arranged in a vertical symmetrical mode, the circuit connection is simpler, the process of the photovoltaic modules is simplified, the width of the photovoltaic modules can be reduced on the premise that the power of the photovoltaic modules is competitive, and the problem that raw materials such as glass cannot be supplied is solved.

Further, a bypass diode 4 is arranged in the battery plate 10 and used for realizing a bypass function when the battery string 2 is shielded by a shadow, so that the components are prevented from being damaged due to overheating. Specifically, the 1 st group battery 1 to the 2N group battery 1, a first bypass diode 4 that connects in reverse parallel between two adjacent group batteries 1 to and, a second bypass diode 5 that connects in reverse parallel between the 2N +1 group battery 1 and the 2N group battery 1, lay with same direction based on with battery cluster 2, are favorable to the setting of bypass diode, can reduce the quantity that uses bypass diode, reduce cost.

For example, as shown in fig. 1, where N ═ 2, i.e. the photovoltaic module includes five battery packs 1, specifically, when the whole photovoltaic module includes 50pcs whole piece, the whole piece with a side length of 210mm is divided into three by laser scribing, each battery string 2 includes one third of the battery pieces 3 connected in series by 15pcs, which makes up 10 battery strings 2, and the battery strings 2 are laid parallel to the short side of the photovoltaic module, i.e. in a horizontal arrangement, and two adjacent battery strings 2 are in a parallel state, thereby making up five parallel structures, i.e. five battery packs 1, and then five battery packs 1 are connected in series, where, in the first battery pack 1 to the fourth battery pack 1, a first bypass diode 4 is connected in reverse parallel between two adjacent battery packs 1, and a second bypass diode 5 is connected in reverse parallel between the fifth battery pack 1 and the fourth battery pack 1, thereby forming the circuit board 10 for a 50pcs210mm size large silicon wafer photovoltaic module.

In the embodiment, as the conventional diode is limited by the reverse voltage-withstanding capability of the conventional diode, the number of the battery pieces which can be protected at most is not more than 24, and the number of the battery pieces 3 in each battery string 2 needs to be matched according to the bypass diode, so that the situation that the voltage of the battery pieces 3 in each battery string 2 is too high and the bypass diode is in breakdown risk is avoided, for example, the number of the battery pieces 3 in each battery string 2 is fifteen-one third of the battery pieces, so that when two adjacent battery strings 2 are connected in parallel, the number of the battery pieces 3 protected by the single bypass diode is not more than 24pcs, and the problem of reverse breakdown of the bypass diode is avoided.

In an embodiment, the bypass diode is arranged within the junction box 6.

Specifically, as shown in fig. 2, N first bypass diodes 4 are disposed at a first end of the battery panel 10, and a second bypass diode 5 is disposed at a second end of the battery panel 10, where the first end of the battery panel 10 is opposite to the second end, at this time, the second bypass diode 5 may be disposed in one junction box 6, and the N first bypass diodes 4 are disposed in at least one junction box 6, that is, when bypass diodes are disposed at both sides of the battery panel 10, the second bypass diode 5 at the second end of the battery panel 10 needs to be disposed in one single junction box 6, and a plurality of first bypass diodes 4 at the first end of the battery panel 10 may be disposed in the junction box 6, so as to reduce the number of the junction boxes 6 and reduce the cost.

Alternatively, as shown in figure 3, N first bypass diodes 4 are provided at a first end of the panel 10; lead wire bus bar 7 is led out from the negative end of the 2N +1 th battery pack 1, and second bypass diode 5 is arranged at the first end of battery board 10 through lead wire bus bar 7, that is, second bypass diode 5 at the second end of battery board 10 can be moved to the first end of battery board 10 in the form of negative jumper wire, thereby making N first bypass diodes 4 and second bypass diodes 5 all located at the same side of battery board 10, which is beneficial to reducing the occupation space of photovoltaic module, at the moment, N first bypass diodes 4 and second bypass diodes 5 are arranged in at least one junction box 6, the number of used junction boxes 6 can be reduced, and the cost is reduced.

Further, in the module circuit, since there may be a partial overlapping region between the jumper wire and the battery cell, when the lead bus bar 7 is provided, an insulating layer is provided at least in the overlapping region to avoid a short circuit, a leakage current, or the like. It can be understood that, for convenience of preparation, the insulating layer may also be disposed in the surrounding area at the same time, or other ways capable of achieving insulation between the jumper and the cell, which is not specifically limited in this embodiment as long as the normal operation of the photovoltaic module is not affected. The insulating layer can be a reflective film, so that the insulating effect can be achieved, light reflection can be performed, and the performance of a photovoltaic module device can be improved. On the premise of achieving the insulating effect, the thickness of the insulating layer is reduced as much as possible so as to avoid lamination and cracking.

Wherein, to two-sided dual glass class subassembly, if the subassembly back produces shelters from and can lead to subassembly back power to descend, can bring reliability hidden danger such as hot spot because shelter from even, if terminal box 6 is in the long limit both sides of subassembly, then shelters from the 3 backs of battery piece for avoiding terminal box 6, then need reserve enough space and give terminal box 6 to lead to the subassembly width widen, the change reduces subassembly efficiency mutually. Consequently, all set up the bypass diode in the circuit connection mode of panel 10 first side more be applicable to two-sided dual glass assembly, can avoid the problem that subassembly efficiency reduces, be favorable to improving two-sided rate and reliability.

The following describes the arrangement of the junction box 6 in the photovoltaic module according to the present invention in further detail with reference to the accompanying drawings.

In the embodiment, the size of the whole battery piece is 210mm, the invention divides the whole battery piece with the side length of 210mm into three by means of laser scribing, namely, one third of the battery piece is adopted, as shown in fig. 1, wherein the number of the battery packs 1 is five, the adjacent battery packs 1 are connected in series, and two adjacent battery strings 2 are connected in parallel, so as to form 14 strings of battery strings 2, 15pcs of one third of the battery piece 3 is adopted on each battery string 2, wherein the battery strings 2 in the five battery packs 1 are arranged in parallel with the short side of the assembly, so as to form the battery panel 10.

In the embodiment, as shown in fig. 1, a first bypass diode 4 is connected in parallel between a first battery pack 1 and a second battery pack 1, a first bypass diode 4 is connected in parallel between a third battery pack 1 and a fourth battery pack 1, and a second bypass diode 5 is connected in parallel between a fourth battery pack 1 and a fifth battery pack 1, so that two first bypass diodes 4 and one second bypass diode 5 are arranged in the whole photovoltaic module.

Further, when the junction boxes 6 are provided, two first bypass diodes 4 and one second bypass diode 5 may be respectively provided in one junction box 6, as shown in fig. 2, the corresponding junction boxes 6 are provided as three single junction boxes, two junction boxes 6 respectively and separately provided corresponding to the two first bypass diodes 4 are located at a first end of the battery panel 10, and the junction box 6 separately provided corresponding to the second bypass diode 5 is located at a second end of the battery panel 10. Alternatively, the two first bypass diodes 4 are arranged in one junction box 6, and the second bypass diode 5 is arranged in one junction box 6 separately, i.e. the two first bypass diodes 4 are integrated in one junction box 6 by circuit connection, while the junction box 6 of the second end of the battery plate 10 is still a single diode junction box in which the second bypass diode 5 is arranged.

Alternatively, in an embodiment in which two first bypass diodes 4 are provided at the first end of the battery panel 10 and a second bypass diode 5 is provided at the first end of the battery panel 10 through the lead bus bar 7 as shown in fig. 3, the two first bypass diodes 4 and the second bypass diode 5 may be provided in at least one junction box 6. Specifically, as shown in fig. 3, the second bypass diode 5 at the second end of the cell plate 10 is moved to the first end of the cell plate 10 in the form of the lead bus bar 7, so that three bypass diodes are located on the same side of the cell plate 10, and therefore all or part of the bypass diodes can be arranged in the same junction box 6, that is, three to one junction box 6 can be arranged, for example, all three bypass diodes can be arranged in the same junction box 6, or four bypass diodes can be respectively and independently arranged in the junction box 6 as shown in fig. 3, or any two adjacent bypass diodes can be integrated in one junction box, and the other bypass diode can be independently arranged in one junction box 6, and the arrangement mode is not particularly limited.

It should be noted that, in the present invention, when each bypass diode is separately disposed in the terminal box 6, the circuit connection manner of the battery panel 10 is relatively simpler than the other terminal box 6 arrangement manners.

In an embodiment, when the at least one bypass diode is connected to the common junction box 6 by edge bus bars, there is an overlap region of the edge bus bars, and an insulation bar is disposed between the edge bus bars of the overlap region, the insulation bar covering at least the overlap region. Specifically, in the present invention, when partial bypass diodes are integrated and combined in the same junction box 6, the edge bus bar needs to be extended at the overlapping position of the edge bus bar, and at this time, there is overlapping between the edge bus bar and the edge bus bar, and an insulating bar needs to be disposed at the overlapping position for corresponding insulating treatment, so as to avoid the problem of electrical connection at the overlapping position due to direct contact, and ensure the normal operation of the photovoltaic module. It is understood that, for the convenience of preparation, the insulating strips may also be disposed in the surrounding area at the same time, and this embodiment is not particularly limited thereto as long as the normal operation of the photovoltaic module is not affected.

Further, the edge bus bar may include a center conductive line and a peripheral insulating layer wrapped outside the center conductive line. It should be noted that when the edge bus bar with the structure is in contact with other lead structures, the peripheral insulating layer can play an insulating role, and an additional insulating layer is not required, so that the photovoltaic module structure and the process are simplified.

In summary, according to the photovoltaic module of the embodiment of the present invention, one third of the cells 3 are adopted, and all the cells 2 are arranged in parallel along the short side of the module, and the long side of the one third of the cells 3 is parallel to the long side of the module, i.e. the arrangement manner of horizontal row is adopted, compared with the arrangement manner of two symmetrical parts, the circuit connection is simpler, the complicated processes of jumper wire laying and insulation can be reduced, and the manufacturing process of the module is further simplified, and the productivity is improved, meanwhile, compared with the circuit adopting the whole cell module, the increase amplitude of the module current is reduced by adopting the circuit processing manner of cutting three and two, i.e. adopting one third of the cells 3 and connecting the cells 2 in parallel, and especially, for the design of the cell with the size of 50pcs210mm, the cell with the current of 1.8 times originally is reduced to 0.6 times by the circuit connection manner of the photovoltaic module of the present invention, and then the current of the component is recovered to 1.2 times by a parallel circuit mode, so that the current of the component is close to that of the component corresponding to the existing 166mm battery, the power of the component can reach more than 460W and is higher than that of the component corresponding to the 166mm battery, the impact on the component caused by overhigh current is avoided, and the width of the component can be reduced as much as possible on the premise of ensuring the competitiveness of the component power, so that the problem that raw materials such as glass cannot be supplied is solved.

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

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, comprising:

the battery pack comprises 2N +1 battery packs connected in series, each battery pack comprises two battery strings connected in parallel, each battery string comprises a plurality of battery pieces which are connected in series and equal in number, and N is a positive integer;

all the battery strings are arranged in parallel with the short side direction of the assembly, and the battery piece is a one-third battery piece formed by cutting the whole battery piece.

2. The pv assembly according to claim 1 wherein the number of said groups is five and the number of said tiles in each said string is fifteen-one-third tiles.

3. The photovoltaic module of claim 1,

the battery pack comprises 1 st battery pack to 2 Nth battery pack, wherein a first bypass diode is connected between every two adjacent battery packs in parallel in a reverse direction, and a second bypass diode is connected between the 2N +1 th battery pack and the 2 Nth battery pack in parallel in the reverse direction.

4. The photovoltaic module of claim 3,

n first bypass diodes are arranged at a first end of the solar panel, the second bypass diodes are arranged at a second end of the solar panel, and the first end of the solar panel is opposite to the second end.

5. The photovoltaic module of claim 4, wherein the second bypass diode is disposed in a junction box and N of the first bypass diodes are disposed in at least one junction box.

6. The photovoltaic module of claim 3,

the N first bypass diodes are arranged at the first end of the battery panel;

and a lead bus bar is led out from the cathode end of the 2N +1 th battery pack, and the second bypass diode is arranged at the first end of the battery board through the lead bus bar.

7. The photovoltaic module of claim 6, wherein N of the first bypass diodes and the second bypass diodes are disposed in at least one junction box.

8. The photovoltaic module of claim 1, wherein the size of the entire cell sheet is 210 mm.

9. The photovoltaic module of claim 2,

the battery strings in the five battery packs are arranged in parallel with the short side direction of the assembly to form the battery plate;

and a first bypass diode is connected between the first battery pack and the second battery pack in parallel, a first bypass diode is connected between the third battery pack and the fourth battery pack in parallel, and a second bypass diode is connected between the fourth battery pack and the fifth battery pack in parallel.

10. The photovoltaic module of claim 9,

the two first bypass diodes and the second bypass diode are respectively arranged in a junction box.

11. The photovoltaic module of claim 9,

the two first bypass diodes are arranged in one junction box, and the second bypass diode is arranged in one junction box.

12. The photovoltaic module of claim 9,

two first bypass diodes are arranged at the first end of the battery plate, and the second bypass diode is arranged at the first end of the battery plate through a lead bus bar;

two of the first bypass diodes and the second bypass diode are disposed in at least one junction box.

13. Photovoltaic cell according to any of claims 5 or 6 or 11 or 12, characterized in that at least one bypass diode is connected to a common junction box by edge busbars, which have overlapping areas, between which are arranged insulating strips, which cover at least the overlapping areas.