CN210607287U

CN210607287U - Photovoltaic module

Info

Publication number: CN210607287U
Application number: CN201922061607.1U
Authority: CN
Inventors: 黄甫阳; 董经兵; 潘秀娟
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-05-22
Anticipated expiration: 2029-11-26

Abstract

The utility model discloses a photovoltaic module. The photovoltaic module comprises at least 6 battery cell groups connected in series, each battery cell group comprises two battery cells connected in parallel, each battery cell comprises two battery strings connected in series, each battery string comprises n battery pieces connected in series, n is a positive integer, and n is more than 6 and less than or equal to 12; the two battery units are connected with the same diode in parallel in an opposite direction; the battery piece is a half battery piece formed by cutting a whole battery piece. The embodiment of the utility model provides a technical scheme has reached increase photovoltaic module output's beneficial effect, and has reduced photovoltaic module's hot spot temperature simultaneously.

Description

Photovoltaic module

Technical Field

The embodiment of the utility model provides a relate to the photovoltaic power generation field, especially relate to a photovoltaic module.

Background

With the continuous development of photovoltaic power generation technology, photovoltaic modules are gradually applied to various fields of social life and are favored by users.

The photovoltaic module in the prior art adopts the mode of setting up the diode to reduce the influence of hot spot effect, is subject to the reverse breakdown voltage of diode, and the number of the battery piece that every diode protected is 24 at most, and the diode number of photovoltaic module is 144 at most, and under the prerequisite that maintains the battery piece connected mode of photovoltaic module and diode quantity unchangeable, the battery piece quantity in the photovoltaic module can't continue to increase, and then leads to the unable increase of output of photovoltaic module. On the other hand, the hot spot temperature of the photovoltaic module in the prior art is higher.

SUMMERY OF THE UTILITY MODEL

The utility model provides a photovoltaic module to guaranteeing under the prerequisite that the diode can not be punctured by reverse, increasing photovoltaic module middle cell piece quantity, promoting photovoltaic module's output reduces photovoltaic module's hot spot temperature simultaneously.

The embodiment of the utility model provides a photovoltaic module, including at least 6 series connection's battery cell group, the battery cell group includes two battery cell of parallel connection, the battery cell includes two series connection's battery cluster, the battery cluster includes n series connection's battery piece, n is the positive integer, and 6 < n is less than or equal to 12; the two battery units are connected with the same diode in parallel in an opposite direction;

the battery piece is a half battery piece formed by cutting a whole battery piece.

The embodiment of the utility model provides a photovoltaic module includes at least 6 series connection's battery cell group, and the battery cell group includes two battery cell of parallel connection, and battery cell includes two series connection's battery cluster, and the battery cluster includes n series connection's battery piece, and n is the positive integer, and 6 < n is less than or equal to 12; the two battery units are connected with the same diode in parallel in the reverse direction, wherein the battery pieces are half battery pieces formed by cutting the whole battery piece, so that the number of the battery pieces in the photovoltaic module is larger than 144 battery pieces which are the maximum number of the battery pieces which can be arranged in the photovoltaic module in the prior art, and the beneficial effect of increasing the output power of the photovoltaic module is achieved. In addition, the number of the battery pieces connected with any battery piece in series is smaller than 23 battery pieces connected with any battery piece in the photovoltaic module in the prior art, the number of the battery pieces connected with a single battery piece in series is reduced, and further when a certain battery piece is partially shielded, the total output power provided for the battery piece by other battery pieces connected with the certain battery piece in series is reduced, so that the hot spot temperature of the photovoltaic module is reduced.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a schematic circuit diagram of a photovoltaic module according to the prior art;

fig. 2 is a schematic circuit structure diagram of a photovoltaic module according to an embodiment of the present invention;

FIG. 3 is a diagram of the actual orientation of the photovoltaic module after installation in this embodiment;

FIG. 4 is a diagram illustrating a relationship between a ratio of output power of a photovoltaic module and a number of rows of shielded cells according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the photovoltaic module of FIG. 2;

FIG. 6 is a schematic cross-sectional view taken along the dashed line AB of FIG. 5;

fig. 7 is a schematic view of another configuration of the photovoltaic module of fig. 2.

Description of the reference numerals

A battery string-1;

tandem structure-2;

parallel configuration-3;

a diode-4;

a battery piece-5;

a cell stack-100;

a battery cell-120;

a battery string-101;

a battery piece-201;

a diode-300;

a center bus bar-400;

a sub-bus bar-410;

edge bus bar-500

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects of a photovoltaic module according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

The embodiment of the utility model provides a photovoltaic module, including at least 6 series connection's battery cell group, the battery cell group includes two battery cell of parallel connection, the battery cell includes two series connection's battery cluster, the battery cluster includes n series connection's battery piece, n is the positive integer, and 6 < n ≤ 12; the two battery units are connected with the same diode in parallel in an opposite direction;

The above is the core idea of the present application, and the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, under the premise that creative work is not done by ordinary skilled in the art, all other embodiments obtained all belong to the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and one skilled in the art may readily devise many other varied embodiments that are not limited to the specific details disclosed herein.

Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of explanation, the schematic drawings showing the structure of the device are not partially enlarged according to the general scale, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.

Fig. 1 is a schematic circuit diagram of a photovoltaic module in the prior art. As shown in fig. 1, a photovoltaic module in the prior art includes 12 cell strings 1, where every two cell strings 1 form a series structure 2, every two series structures 2 form a parallel structure 3, and the parallel structures 3 are connected in series, where a cell is a half cell cut from a whole cell. Further, every two series structures 2 forming the parallel structure 3 are reversely connected with the same diode 4 in parallel, and the number of the battery pieces 5 protected by each diode 4 is the number of the battery pieces 5 in the series structures 2, namely the number of the total battery pieces 5 in the two battery strings 1, so that the number of the battery pieces 5 in the battery strings 1 is limited by the reverse voltage-resisting capacity of the diode 4, the number of the total battery pieces 5 in the photovoltaic module cannot be increased, and the performance improvement of the photovoltaic module is affected. On the other hand, in the orientation shown in fig. 1, the lowermost region of the photovoltaic module shown in fig. 1 is easily shielded, and for example, a row of cells 5 at the lowermost position in the photovoltaic module shown in fig. 1 is shielded, so that only the upper series-connection structure 2 passes current, but no current passes through the lower series-connection structure 2, and the output power of the photovoltaic module is about 50% of the original output power. It can be seen that the shielding of part of the cell 5 has a great influence on the output power of the photovoltaic module. And the number of the battery pieces 5 connected in series is 24, when a single battery piece 5 is partially shielded, 23 battery pieces 5 supply energy to the shielded battery piece 5 by using the shielded battery piece 5 as a load, so that the hot spot temperature is high.

Fig. 2 is a schematic circuit structure diagram of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 2, the photovoltaic module includes at least 6 cell groups 100 connected in series, the cell group 100 includes two battery cells 120 connected in parallel, the battery cell 120 includes two battery strings 101 connected in series, the battery string 101 includes n battery sheets 201 connected in series, n is a positive integer, and n is greater than 6 and less than or equal to 12; the two battery units 120 are connected in parallel with the same diode 300 in an opposite direction, wherein the battery sheet 201 is a half battery sheet formed by cutting a whole battery sheet.

The diode 300 is used, among other things, to reduce the effects of hot spot effects in photovoltaic modules. In addition, the reason why the two battery cells 120 in each battery cell group 100 are connected in parallel is that: when all the cells 201 are connected in series, the output voltage across the photovoltaic module is large, and the arrangement can reduce the output voltage of the photovoltaic module by half.

In the photovoltaic module shown in fig. 2, the voltage of the single cell string 101 is the total voltage V1 of the n series-connected cells 201, and the two cell strings 101 are connected in series to form the cell unit 120, so that the total voltage V2 of the single cell 120 is equal to the total voltage of the two series-connected cells 101, that is, V2 is equal to 2V1, that is, the total voltage V2 of the single cell 120 is equal to the total voltage of the 2n series-connected cells 201, and assuming that the voltage of the single cell 201 is Va, V2 is equal to 2n × Va. On the other hand, the number of the battery pieces 201 connected in reverse parallel with the single diode 300 is at most 24 limited by the reverse breakdown voltage of the conventional diode, and thus, there is 2n × Va ≦ 24 × Va, that is, n ≦ 12, on the premise of ensuring that the diode 300 is not reverse-broken.

In addition, when the number of the cell groups 100 in the photovoltaic module is 6, and n is 6, the total number of the cells 201 in the photovoltaic module is equal to the total number of the cells in the conventional photovoltaic module in the prior art, and the cells 201 in the present embodiment and the cells in the photovoltaic module in the prior art are both half of the cells 201 formed by cutting a whole cell, so the output powers of the single cells 201 in the two are equal, and at this time, the structure of the photovoltaic module provided in the present embodiment cannot achieve the purpose of increasing the output power. When n is less than 6, the total number of the cells 201 in the photovoltaic module provided by the embodiment is less than the total number of the cells in the conventional photovoltaic module in the prior art, and the output powers of the cells 201 in the two are equal, at this time, the output power of the photovoltaic module provided by the embodiment is less than the output power of the photovoltaic module in the prior art, and the effect of increasing the output power can no longer be achieved.

In summary, in order to provide the output power of the photovoltaic device, n is preferably set to be greater than 6 and less than or equal to 12 in the embodiment.

The photovoltaic module provided by the embodiment includes 6 battery cell groups 100 connected in series, each battery cell group 100 includes two battery units 120 connected in parallel, each battery unit 120 includes two battery strings 101 connected in series, each battery string 101 includes n battery pieces 201 connected in series, n is greater than 6 and is less than or equal to 12, each two battery units 120 are connected in parallel with the same diode 300 in a reverse direction, wherein each battery piece 201 is a half battery piece formed by cutting a whole battery piece, so that the number of the battery pieces 201 in the photovoltaic module is greater than the maximum number 144 of the battery pieces which can be set by the photovoltaic module in the prior art, and the beneficial effect of increasing the output power of the photovoltaic module is achieved. In addition, the number of the cells 201 connected in series with any cell 201 is less than 23 cells connected in series with any cell in the photovoltaic module in the prior art, the number of the cells connected in series with a single cell is reduced, and further, when a certain cell 201 is partially shielded, the total output power provided by other cells 201 connected in series with the certain cell 201 to the cell 201 is reduced, so that the hot spot temperature of the photovoltaic module is reduced.

It should be noted that, when the number of the cell units 100 in the photovoltaic module is the minimum value 6, corresponding to fig. 1, fig. 3 is an actual orientation diagram after the photovoltaic module is installed in the present embodiment, and at this time, the lowermost area of the photovoltaic module is an easily-shielded area. For example, when a row of the battery sheets 201 at the bottom of the photovoltaic module shown in fig. 3 is completely covered, no current passes through the serial structure of the battery sheets 201, that is, no current passes through the battery unit group 100 at the bottom, and currents pass through all the other battery unit groups 100 connected in series with the battery unit group 100, at this time, the output power of the photovoltaic module is about 83.3% of the original output power, and compared with 50% in the prior art, the influence of the covering of a part of the battery sheets 201 in the photovoltaic module provided in this embodiment on the output power of the photovoltaic module is significantly reduced. Specifically, fig. 4 is a graph illustrating a relationship between a ratio of output power of a photovoltaic module and a number of rows of shielded cells according to an embodiment of the present invention. It is noted that the corresponding cell rows in fig. 4 are defined as follows: 1. for the photovoltaic module provided by the embodiment, the direction perpendicular to the arrangement direction of the three diodes is the extending direction of the cell rows; 2. for the photovoltaic module in the prior art, the arrangement direction of the three diodes is the extending direction of the cell rows. Specifically, in fig. 4, a is a curve of the output power of the photovoltaic module formed by using the whole cell along with the change of the shielding area, B is a curve of the output power of the photovoltaic module provided by the embodiment of the present invention along with the change of the shielding area, and C is a curve of the output power of the photovoltaic module along with the change of the shielding area in the prior art shown in fig. 1. As shown in fig. 4, compared to the photovoltaic device in the prior art, the output power ratio of the photovoltaic device provided in the present embodiment is significantly increased.

Fig. 5 is a schematic diagram of the structure of the photovoltaic module of fig. 2. As shown in fig. 5, all the cells 201 in the photovoltaic module are arranged in 2n rows and 2m columns, the extending direction of the cell rows is a first direction X, and the extending direction of the cell columns is a second direction Y, where m is a positive integer greater than 5.

It should be noted that such an arrangement enables the arrangement of the cell sheets 201 in the photovoltaic module to be more orderly and regular, and is convenient for design and production.

Optionally, with continued reference to fig. 5, n battery pieces 201 in the 1 st row to the nth row and n battery pieces 201 in the n +1 st row to the 2 nth row in each battery piece column are respectively connected in series to form one battery string 101. Two adjacent battery strings 101 are connected in series as one battery cell 120 along the extending direction of the battery sheet row, i.e., the first direction X, and two battery cells 120 in the same column are connected in parallel as the battery cell group 100 along the extending direction of the battery sheet column, i.e., the second direction Y.

It should be noted that, due to the arrangement, the battery sheets 201 in the same battery cell group 100 are closely arranged, and it is convenient to implement a series connection process between the adjacent battery sheets 201, so as to avoid overlapping between the signal lines.

Optionally, with continued reference to fig. 5, the number of at least 6 series-connected cell stacks 100 is 6.

Further, n is 7.

When the number of at least 6 cell groups 100 connected in series is 6 and n is 6, the number of the whole cells that can be formed by all the cells 201 in the photovoltaic module is equal to the number of the whole cells that can be formed by all the cells in the photovoltaic module of the related art, and therefore, the areas of the cell arrays may be equal, and the area of the photovoltaic module may be equal. Meanwhile, considering that the overall size of the battery array in the present application is the same as the overall size of the battery array in the prior art, a glass substrate having the same size as the glass substrate carrying the battery piece array in the photovoltaic module in the prior art can be used in the present embodiment, so that the size of the photovoltaic module provided by the present embodiment is the same as the size of the photovoltaic module in the prior art. Therefore, when the number of the at least 6 battery cell groups 100 connected in series is 6 and n is 7, the size of the photovoltaic module provided by the embodiment is similar to that of the photovoltaic module in the prior art, and the packaging and transportation of the photovoltaic module only need to be finely adjusted on the related parameters of the conventional photovoltaic module in the prior art, so that the packaging and transportation difficulty and the design cost are favorably reduced, and the photovoltaic module can achieve the beneficial effect of increasing the output power because 6 is less than 7 and less than 12.

As shown in fig. 5, the photovoltaic module may further include a central bus bar 400 extending in the first direction X, and two battery cells 120 in the same cell group 100 are connected in parallel to the central bus bar 400.

It should be noted that the central bus bar 400 is arranged such that the parallel connection of two battery units 120 in the plurality of battery unit groups 100 and the series connection of six battery unit groups 100 can be simultaneously realized only by forming one wire, which is beneficial to simplifying the manufacturing process steps of the assembly, reducing the production difficulty, reducing the number of wires, reducing the area occupied by the wires in the photovoltaic assembly, and being beneficial to reducing the overall size of the photovoltaic assembly.

Alternatively, fig. 6 is a schematic cross-sectional view taken along the dashed line AB in fig. 5. As shown in fig. 5 and 6, two battery pieces adjacently disposed in the same battery string partially overlap in a direction Z perpendicular to a plane in which the battery piece arrays are disposed, and a center bus bar is disposed between the battery pieces in the n-th row and the n + 1-th row.

It should be noted that fig. 5 and 6 illustrate a structure of a photovoltaic module formed by stacking the battery cells 201, in other embodiments of this embodiment, a photovoltaic module may also be formed by using a tile method, and specifically, fig. 7 is a schematic view of another structure of the photovoltaic module in fig. 2. Fig. 7 illustrates a structure of a photovoltaic module formed by the cell sheets 201 in a tiled manner, as shown in fig. 7, two adjacent cell sheets 201 in the same cell string 101 are not overlapped in a direction perpendicular to a plane of the cell sheet array, and the central bus bar 400 is disposed between the n-th and n + 1-th cell sheets 201.

Referring to fig. 5 and 7, the central bus bar 400 includes at least 7 sub-bus bars 410 arranged along the extending direction of the cell rows, and each two adjacent sub-bus bars 410 are electrically connected with one diode 300, so as to realize that two battery cells 120 in the same battery cell group 100 are connected in parallel with the same diode 300 in an opposite direction, and the difference between the number of the sub-bus bars 410 and the number of the battery cell group 100 is 1.

With continued reference to fig. 5 and 7, the diode 300 is disposed between any two of the battery strings 101 connected in series in the corresponding battery cell group 100 in the extending direction of the cell row. Such an arrangement allows for a more uniform distribution of the diodes 300 and facilitates routing and connection of the diodes 300 to the traces.

With continued reference to fig. 5, the photovoltaic module may further include a plurality of edge bus bars 500, the edge bus bars 500 corresponding to the battery units 120 one-to-one, the edge bus bars 500 being located at a side of the two battery strings 101 away from the center bus bar 400 in the corresponding battery unit 120, and both sides of the two battery strings 101 away from the center bus bar 400 being electrically connected to the corresponding edge bus bars 500 to form the battery unit 120.

It should be noted that, in such an arrangement manner, the series connection of the two battery strings 101 in the battery unit 120 can be simply realized through the edge bus bar 500 located outside the battery piece array, so that the number of the wires arranged in the battery piece array is reduced, the arrangement of the battery pieces 201 in the battery piece array is tighter, the influence of the wires on the size of the battery piece array is reduced, and the edge bus bar 500 has a larger space arrangement, so that the difficulty in production and design is reduced.

Illustratively, all diodes in the photovoltaic module are disposed in the same junction box. Such an arrangement enables the diodes to be closely spaced and the electrical connection of all the diodes to the array of cells to be achieved by a simple connection of the junction box.

Optionally, the number of the at least 6 battery cell groups 100 is p, and every q adjacent diodes in the photovoltaic module are disposed in the same junction box, where p is an integer multiple of q, and p is a positive integer. Illustratively, p is 6, q is 2, and the photovoltaic module includes 3 junction boxes, and 2 diodes are disposed in each junction box. Under the arrangement, the junction box connected with 2 diodes can be directly connected into the battery plate array, so that the beneficial effect of simplifying the diode connection process is achieved.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A photovoltaic module is characterized by comprising at least 6 battery cell groups connected in series, wherein each battery cell group comprises two battery cells connected in parallel, each battery cell comprises two battery strings connected in series, each battery string comprises n battery pieces connected in series, n is a positive integer and is more than 6 and less than or equal to 12; the two battery units are connected with the same diode in parallel in an opposite direction;

2. The photovoltaic module according to claim 1, wherein all the cells in the photovoltaic module are arranged in 2n rows and 2m columns, the extending direction of the cell rows is a first direction, the extending direction of the cell columns is a second direction, and m is a positive integer greater than 5.

3. The photovoltaic module according to claim 2, wherein n of the cell pieces in the 1 st to nth rows and n of the cell pieces in the n +1 th to 2 nth rows in each cell column are respectively connected in series to form one cell string;

along the extending direction of the battery piece row, every two adjacent battery strings are connected in series to form one battery unit;

and two battery units in the same row are connected in parallel along the extension direction of the battery sheet row to form the battery unit group.

4. The photovoltaic module of claim 3, wherein the number of the at least 6 series-connected cell stacks is 6.

5. The photovoltaic module of claim 4, wherein n-7.

6. The photovoltaic assembly of claim 3, further comprising a central bus bar extending along the first direction; two of the battery cells in the same battery cell group are connected in parallel to the center bus bar.

7. The photovoltaic module according to claim 6, wherein two adjacent cells in the same cell string are non-overlapped along a direction perpendicular to a plane of the cell array; the center bus bar is disposed between the battery cells in the nth row and the (n + 1) th row.

8. The photovoltaic module according to claim 6, wherein two of the cell sheets adjacently disposed in the same cell string partially overlap in a direction perpendicular to a plane in which the cell sheet arrays lie; the center bus bar is disposed between the battery cells in the nth row and the (n + 1) th row.

9. The photovoltaic module according to claim 6, wherein the central bus bar comprises at least 7 sub-bus bars arranged along the extending direction of the cell row, and each two adjacent sub-bus bars are electrically connected with one diode; the difference between the number of the sub-bus bars and the number of the cell groups is 1.

10. The pv module according to claim 9 wherein the diodes are disposed between any two of the strings connected in series in the corresponding cell group along the direction of the row of cells.

11. The photovoltaic module of claim 6, further comprising a plurality of edge bus bars, wherein the edge bus bars correspond to the battery cells one-to-one, the edge bus bars are located on a side of two of the battery strings corresponding to the battery cells away from the center bus bar, and a side of the two of the battery strings away from the center bus bar is electrically connected to the corresponding edge bus bar to form the battery cells.

12. The photovoltaic module of claim 1, wherein all of the diodes in the photovoltaic module are disposed in the same junction box.

13. The pv module according to claim 1, wherein the number of the at least 6 cell groups is p, and each q adjacent diodes in the pv module are disposed in the same junction box, wherein p is an integer multiple of q, and p is a positive integer.