CN213366610U - Solar cell module and solar cell array - Google Patents

Abstract

The application discloses a solar cell module and a solar cell array. The solar cell module comprises a back plate, a first junction box, a second junction box, a third junction box and 2n +1 rows of cell string groups which are sequentially arranged, the third junction box is located in the center of the back plate, third bypass diodes which are reversely connected with the n +1 row of cell string groups in parallel are arranged in the third junction box, the first junction box is provided with first bypass diodes, the second junction box is provided with second bypass diodes, the first bypass diodes are reversely connected in parallel with the 1 st row of cell string groups to the n +1 row of cell string groups, and the second bypass diodes are reversely connected in parallel with the n +2 row of cell string groups to the 2n +1 row of cell string groups. According to the scheme, the third bypass diode is independently connected in parallel with the battery string group positioned at the middle of the battery string groups in odd-numbered rows, and the third bypass diode is positioned at the center of the back plate, so that the battery assembly with the battery string groups in odd-numbered rows can still be rotationally symmetrical, and the appearance is attractive and elegant.

Description

Solar cell module and solar cell array

Technical Field

The utility model relates to a photovoltaic field especially relates to a solar module and solar cell array.

Background

At present, when a solar cell module is designed, an even number of solar cell string groups are generally selected, but in actual use, specific requirements may be imposed on the power, specification and the like of solar cells, so that the situation that the number of rows of the solar cell string groups is odd inevitably occurs, but in the existing scheme, extra junction boxes are placed on the side edges, as shown in fig. 5 and 6, so that the solar cell module is asymmetric, and the appearance of the solar cell module is not attractive.

SUMMERY OF THE UTILITY MODEL

The problem to be solved by the embodiments of the present disclosure is to provide a solar cell module with an odd number of cell strings and a symmetrical and beautiful appearance.

In a first aspect, the disclosed embodiment provides a solar cell module, which includes a back plate, a first junction box, a second junction box, a third junction box, and a 2n +1 row of cell string sets arranged in sequence, where n is an integer greater than or equal to 1 and the cell string sets are connected in series, the cell string set is disposed on one surface of the back plate, the first junction box, the second junction box, and the third junction box are disposed on the other surface of the back plate, the third junction box is located at the center of the back plate, the first junction box and the second junction box are symmetric with respect to the center of the back plate, a third bypass diode is disposed in the third junction box, an anode of the third bypass diode is connected with a cathode of the n +1 row of cell string sets, a cathode of the third bypass diode is connected with an anode of the n +1 row of cell string sets, the first junction box is provided with a first bypass diode, the second junction box is provided with a, when n is 1, the first bypass diode is connected with the 1 st row of battery string in an inverse parallel mode, the second bypass diode is connected with the 2n +1 th row of battery string in an inverse parallel mode, when n is larger than 1, the first bypass diode is connected with the 1 st row of battery string to the nth row of battery string in an inverse parallel mode, and the second bypass diode is connected with the n +2 nd row of battery string to the 2n +1 th row of battery string in an inverse parallel mode.

In some embodiments, the first junction box and the second junction box are respectively located at opposite corners of the back panel.

In some embodiments, n is an even number.

In some embodiments, n is equal to 2.

In some embodiments, the battery string set consists of an even number of strings of batteries.

In some embodiments, the battery string set consists of 2 strings of battery strings.

In some embodiments, the battery string set consists of one or more parallel battery strings, and the battery string consists of a plurality of battery pieces connected in series.

In some embodiments, the battery piece is obtained by cutting a whole battery piece.

In some embodiments, the battery cells are 1/2-1/20 of the size of a whole battery cell, the whole battery cell is square and the side length size range is 150-250 mm.

In a second aspect, the present disclosure provides a solar cell array, which includes a plurality of solar cell modules in any of the above embodiments, each solar cell module is identical, and the first junction box of a solar cell module is connected to the second junction box of an adjacent solar cell module, so that the solar cell module and other solar cell modules are connected in series.

Compared with the prior art, one of the above schemes has the advantages that:

according to the scheme, the third bypass diode is independently connected with the battery string group positioned at the middle of the battery string groups in odd-numbered rows in parallel, the first bypass diode and the second bypass diode are respectively used for controlling the battery string groups on two sides, the third bypass diode is positioned at the center of the back plate, and the first bypass diode and the second bypass diode are rotationally symmetrical about the center of the back plate, so that the battery assembly with the battery string groups in odd-numbered rows can still be rotationally symmetrical, and the battery assembly is attractive and elegant.

Drawings

Fig. 1 is a schematic structural diagram of a solar cell module in an exemplary embodiment.

Fig. 2 is a schematic circuit diagram of a solar cell module according to an exemplary embodiment.

FIG. 3 is an assembly diagram of various structures on a backplane in an exemplary embodiment.

FIG. 4 is a schematic diagram of the structure of each junction box in an exemplary embodiment.

Fig. 5 is a schematic structural diagram of a known solar cell module assembly.

Fig. 6 is a schematic structural diagram of a known solar cell module assembly.

Fig. 7 is a schematic structural diagram of a solar module assembly in an exemplary embodiment.

Fig. 8 is a schematic structural diagram of a solar module assembly in an exemplary embodiment.

The labels in the figure are: 100. a back plate; 200. a first packaging adhesive film; 310. the 1 st row of battery string groups; 320. the 2 nd row of battery string groups; 330. a 3 rd battery string group; 340. a 4 th battery string group; 350. a 5 th battery string group; 301. a battery string; 3011. a battery piece; 360. a first pass diode; 370. a third bypass diode; 380. a second bypass diode; 390. a bus bar; 400. a second packaging adhesive film; 500. a cover plate; 610. A first junction box; 620. a second junction box; 630. and a third junction box.

Detailed Description

Further explaining the technical means and effects of the present invention to achieve the intended purpose, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments as follows:

in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "provided", "connected" and "disposed" are to be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The term "communicating" is also to be understood in a broad sense, i.e., either directly or indirectly through an intermediary. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The terms "plurality" and "a plurality" in the present disclosure and appended claims refer to two or more than two unless otherwise specified.

Fig. 1 is a schematic structural diagram of a solar cell module in an exemplary embodiment. As shown in fig. 1, a solar cell module includes: the back sheet 100, the first packaging adhesive film 200, the battery sheet 3011, the bus bar 390, the second packaging adhesive film 400, the cover sheet 500 and a plurality of junction boxes.

In some embodiments, the backsheet 100 is a photovoltaic backsheet, which may be made of tempered glass, aluminum foil, or other materials; in some embodiments, the first adhesive packaging film 200 and the second adhesive packaging film 400 may be EVA film or POE film; in some embodiments, the cover plate 500 is photovoltaic glass or other transparent structure.

In some embodiments, the solar cell module includes a back panel 100, a first junction box 610, a second junction box 620, a third junction box 630, and a series of 2n +1 rows of cell strings arranged in sequence, where n is an integer greater than or equal to 1 and the series of cell strings are connected in series, the series of cell strings is located on one side of the back panel 100, the first junction box 610, the second junction box 620, and the third junction box 630 are all disposed on the other side of the back panel 100, the third junction box 630 is located at the center of the back panel, the first junction box 610 and the second junction box 620 are symmetric with respect to the center of the back panel, a third bypass diode 370 is disposed in the third junction box 630, an anode of the third bypass diode 370 is connected to a cathode of the series of the n +1 row of cell strings, a cathode of the third bypass diode 370 is connected to an anode of the series of the n +1 row of cell strings, the first junction box 610, the second junction box 620 is provided with a second bypass diode 380, when n is equal to 1, the first bypass diode 360 is connected in reverse parallel with the 1 st row of battery string set, the second bypass diode 380 is connected in reverse parallel with the 2n +1 th row of battery string set, when n is greater than 1, the first bypass diode 360 is connected in reverse parallel with the 1 st row of battery string set to the n th row of battery string set, and the second bypass diode 380 is connected in reverse parallel with the n +2 nd row of battery string set to the 2n +1 th row of battery string set.

It should be noted that, the first bypass diode is connected in reverse parallel to the 1 st row of battery string group to the nth row of battery string group means: the series connection of the battery string groups in the 1 st to nth rows is connected in series and then connected in reverse parallel with one first bypass diode, which does not mean that a plurality of first bypass diodes are connected in reverse parallel with the battery string groups in the 1 st and the 2 nd rows … nth rows, respectively. Similarly, the reverse parallel connection of the second bypass diodes means that the battery string sets of the (n + 2) th row to the (2n + 1) th row are connected in series and then reversely connected in parallel with one second bypass diode, and does not mean that a plurality of second bypass diodes are respectively connected in reverse parallel with the battery string sets of the (n + 2) th row and the (n + 3) th row … and the (2n + 1) th row. When the battery piece works normally, the bypass diode is cut off in the reverse direction, and no action is produced on the circuit; if the battery piece group connected in parallel with the bypass diode has an abnormally working battery piece due to shielding, the bypass diode is conducted by reverse bias formed by other battery pieces, and at the moment, the abnormally working battery piece is short-circuited.

More specifically, as shown in fig. 1 and fig. 2, in some embodiments, the battery assembly includes a first junction box 610, a second junction box 620, a third junction box 630, and 5(2n +1, where n is equal to 2) rows of battery string sets arranged in sequence, and the battery string sets are connected in series; the battery string set is disposed on one surface of the back plate 100. The first junction box 610, the second junction box 620 and the third junction box 630 are all disposed on the other side of the backplane 100, the third junction box 630 is disposed in the center of the backplane 100, the first junction box 610 and the second junction box 620 are symmetrical with respect to the center of the backplane 100, a third bypass diode 370 is disposed in the third junction box 630, the anode of the third bypass diode 370 is connected to the cathode of the 3 rd row battery string 330, the cathode of the third bypass diode 370 is connected to the anode of the 3 rd row battery string 330, the first junction box 610 is provided with a first bypass diode 360, the cathode of the first bypass diode 360 is connected to the anode of the 1 st row battery string 310, the cathode of the 1 st row battery string 310 is connected to the anode of the 2 nd row battery string 320, the anode of the first bypass diode 360 is connected to the cathode of the 2 nd row battery string 320, the second junction box 620 is provided with a second bypass diode 380, the cathode of the second bypass diode 380 is connected to the anode of the 4 th row battery string 340, and the anode of the second bypass diode 380 is connected to the cathode of the 5 th row battery string 350. In the above solution, the third bypass diode 370 is used as a bypass diode of the 3 rd row battery string set 330 alone, the first bypass diode 360 is used as a bypass diode for controlling the 1 st row battery string set 310 and the 2 nd row battery string set 320, and the second bypass diode 380 is used as a bypass diode for controlling the 4 th row battery string set 340 and the 5 th row battery string set 350, all battery strings can be controlled by 3 diodes, and the third bypass diode 370 is placed in the center of the backboard 100, and the first bypass diode 360 and the second bypass diode 380 are rotationally symmetric with respect to the center of the backboard 100, so that the entire battery assembly with odd-numbered row battery strings can be rotationally symmetric, and the aesthetic property of the entire battery assembly is improved.

It should be understood that a battery string group consists of one or more strings of batteries connected in parallel, and a battery string consists of a plurality of battery pieces connected in series. The structure of the battery sheet 3011 can be various, for example, the battery sheet 3011 can be obtained by cutting a whole battery sheet 3011 and has the size of 1/2-1/20 of the whole battery sheet 3011, and the whole battery sheet 3011 is square and has the side length size range of 150-250 mm. The above structures are only one or more of the structures of the battery sheet 3011, and a user can adjust the shape and size of the battery sheet 3011 according to actual situations as long as the shape and size of the battery sheet 3011 on the back plate 100 are the same, and the disclosure is not limited in any way.

When n is an even number, the input ends and the output ends of the 1 st to nth battery string groups are positioned on the same side, so that the wiring length between the first bypass diode and the 1 st and nth battery string groups is shortened, and the energy consumption is reduced. It should be understood that n is an even number only as an alternative, and in other embodiments, the value of n may be changed according to the actual environment, as long as n is a positive integer greater than or equal to 1.

As the size of the silicon wafer becomes larger, the current of the photovoltaic module becomes larger, and the requirement for controlling the connection loss of the solar cell or the solar module becomes higher. At present, the solar modules of the split type junction box are used, the junction box is placed in a straight line and is placed parallel to a frame, but as the situation that the solar cell modules are horizontally arranged in the original design but become vertically arranged in the final assembly process possibly occurs in the actual assembly process, as shown in figures 5 and 6, the demand quantity of connecting wires among the solar modules is longer in the vertical assembly process, but the demand quantity of the connecting wires among the solar modules is shorter in the horizontal assembly process, and if the solar modules are designed according to the optimized demand quantity of the connecting wires which are horizontally arranged, the situation that the connecting wires are short in length can occur in the vertical assembly process of the modules; if design according to the optimization connecting wire demand of erectting dress, the overlength condition can appear in the connecting wire when violently adorning to this type of subassembly, and power loss also can increase, is unfavorable for very much the production planning. (as shown in fig. 5, "horizontal installation" means that the short sides of the battery arrays are adjacent to each other; as shown in fig. 6, "vertical installation" means that the long sides of the battery arrays are adjacent to each other.) therefore, in one embodiment, as shown in fig. 4, the first terminal box 610 and the second terminal box 620 are located at opposite corners of the back panel 100. Because the first junction box 610 and the second junction box 620 are respectively arranged at the diagonal positions of the back panel 100, when the solar cell array is assembled, no matter the solar cell module is horizontally or vertically installed, the length of the connecting wire between the solar cell modules cannot be overlong, and the connecting wire adopting the horizontally installing mode and the vertically installing mode is approximately the same, so that the power loss caused by overlong connecting wire cannot be greatly increased.

Since the central axis of the back plate 100 is not occupied by the battery strings 301 when the battery string set is composed of even number of battery strings 301, it is more beneficial for the third junction box 630 to be installed in the center of the back plate 100. Therefore, in some embodiments, the battery string set consists of an even number of strings 301. Alternatively, the battery string group is composed of 2 strings of battery strings 301.

In a second aspect, the present disclosure provides a solar cell array, which includes a plurality of solar cell modules in any of the above embodiments, each solar cell module is identical, and the first junction box 610 of a solar cell module is connected to the second junction box 620 of an adjacent solar cell module, so that the solar cell module and other solar cell modules are connected in series. In the scheme, a user only needs to produce one solar cell module and assemble the solar cell module, two solar cell modules (symmetrical solar cell modules) do not need to be produced, and the production efficiency is improved.

It should be understood that the solar array in the above scheme may be part of a large solar array, with the array being connected in series or parallel with other arrays to form a larger solar array.

The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present disclosure, and these modifications and substitutions should also be regarded as the protection scope of the present disclosure.

Claims (10)

1. A solar cell module is characterized by comprising a back plate, a first junction box, a second junction box, a third junction box and a 2n +1 row of cell string groups which are sequentially arranged, wherein n is an integer which is more than or equal to 1, the cell string groups are connected in series, the cell string groups are arranged on one surface of the back plate, the first junction box, the second junction box and the third junction box are arranged on the other surface of the back plate, the third junction box is positioned in the center of the back plate, the first junction box and the second junction box are symmetrical relative to the center of the back plate, a third bypass diode is arranged in the third junction box, the anode of the third bypass diode is connected with the cathode of the n +1 row of cell string groups, the cathode of the third bypass diode is connected with the anode of the n +1 row of cell string groups, the first junction box is provided with a first bypass diode, the second junction box is provided with a second bypass diode, when n is 1, the first bypass diode is connected with the 1 st row of battery string in an inverse parallel mode, the second bypass diode is connected with the 3 rd row of battery string in an inverse parallel mode, when n is larger than 1, the first bypass diode is connected with the 1 st row of battery string to the nth row of battery string in an inverse parallel mode, and the second bypass diode is connected with the n +2 nd row of battery string to the 2n +1 th row of battery string in an inverse parallel mode.

2. The solar cell module as claimed in claim 1, wherein the first junction box and the second junction box are located at opposite corners of the back sheet.

3. The solar cell module as claimed in claim 1, wherein n is an even number.

4. The solar module according to claim 3, wherein n is equal to 2.

5. The solar cell module of claim 1 wherein the string set is comprised of an even number of strings.

6. The solar cell module as claimed in claim 5, wherein the cell string group is composed of 2 strings of cell strings.

7. The solar cell module of claim 1 wherein the string of cells is comprised of one or more strings of cells connected in parallel, the string of cells being comprised of a plurality of series connected cells.

8. The solar cell module as claimed in claim 7, wherein the cell sheet is obtained by cutting a whole cell sheet.

9. The solar cell module as claimed in claim 8, wherein the cell sheet is 1/2-1/20 of the size of a whole cell sheet, and the whole cell sheet is square and has a side length of 150-250 mm.

10. A solar cell array comprising a plurality of solar cell modules according to any of claims 1-9, wherein each solar cell module is identical, and wherein a first junction box of a solar cell module is connected to a second junction box of an adjacent solar cell module such that the solar cell module is connected in series with other solar cell modules.

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