CN214203701U - Photovoltaic module - Google Patents

Abstract

The utility model discloses a photovoltaic module, the related photovoltaic module comprises a plurality of battery strings, each battery string comprises a plurality of half batteries which are connected in series in sequence, the extending direction of the long edge of the half battery is vertical to the length direction of the battery string where the half battery is located, and the size of the long edge of the half battery is 200-235 mm; based on the utility model provides a technical scheme can further improve photovoltaic module's power compared with prior art, and then can be better satisfy the trade to photovoltaic module's high power demand.

Description

Photovoltaic module

Technical Field

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

Background

Photovoltaic power generation is a technology of directly converting light energy into electric energy by using the photovoltaic effect of a semiconductor interface. A conventional power generation system mainly comprises a photovoltaic module, a controller and an inverter, wherein the photovoltaic module is formed by packaging a plurality of solar cells after series-parallel connection. The solar cell sheets on the market for manufacturing photovoltaic modules are generally 125mm by 125mm and 156mm by 156mm, and in order to improve the efficiency, the solar cell sheets with the above specifications are also cut into half cells. However, the solar cell based on the above conventional specifications in the prior art cannot meet the continuous improvement requirement of the module for high power.

In view of the above, there is a need to provide an improved solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the technical problem that prior art exists at least, for realizing the above-mentioned utility model purpose, the utility model provides a photovoltaic module, its concrete design as follows.

A photovoltaic module comprises a plurality of cell strings, wherein each cell string comprises a plurality of half cells which are sequentially connected in series, the extending direction of the long edge of each half cell is perpendicular to the length direction of the cell string where the half cell is located, and the size of the long edge of each half cell is 200-235 mm.

Further, the battery string is provided with a welding strip for connecting two adjacent half batteries, the welding strip comprises a light receiving surface section and a backlight section, the light receiving surface section is connected to the front surface of one of the two adjacent half batteries, the backlight section is connected to the back surface of the other one of the two adjacent half batteries, and at least one part of the light receiving surface section is smaller than the backlight section in width.

Further, the light receiving surface section is provided with a transition section connected to the backlight section, and the width of the transition section is gradually increased in the direction from the light receiving surface section to the backlight section.

Furthermore, the width of the narrowest part of the light receiving surface section is 0.2-0.4mm, and the width of the backlight surface section is 0.6-1.2 mm.

Further, the thickness of the backlight surface section is smaller than or equal to that of the light receiving surface section.

Further, the thickness of the backlight surface section is consistent with the thickness of the thinnest part of the light receiving surface section.

Further, the thickness of the backlight surface section is 0.08-0.25 mm.

Further, the thickness of the light receiving surface section is 0.1-0.4 mm.

Further, a cross-sectional shape of a part of the light receiving surface section is a circle, a triangle, or a trapezoid, and the backlight surface section is a flat shape.

Furthermore, the photovoltaic module further comprises an upper packaging adhesive film arranged on one side of the front face of the battery string and a lower packaging adhesive film arranged on one side of the back face of the battery string, and the thickness of the upper packaging adhesive film is larger than that of the lower packaging adhesive film.

Further, the thickness of the upper packaging adhesive film is 0.35-0.7mm, and the thickness of the lower packaging adhesive film is 0.18-0.6 mm.

Further, the half-cell is provided with a front electrode positioned on the front side, and the front electrode is provided with 10-15 main grids, the extending direction of which is consistent with the length direction of the corresponding cell string.

Further, the front electrode is provided with 12 main grids, and the distance between every two adjacent main grids is 16-18 mm.

Furthermore, in each battery string, the distance between two adjacent half batteries is-0.5-2.0 mm.

Furthermore, at least two battery strings are arranged side by side in the width direction, and the distance between two adjacent battery strings arranged side by side is 1.0-3.0 mm.

Further, photovoltaic module includes that two sets ofly are the battery cluster group of symmetry setting with a symmetry axis, each battery cluster group include 6 in set up side by side in proper order in the battery cluster width direction the battery cluster constitutes two the battery cluster of battery cluster group is in the both sides one-to-one of symmetry axis sets up.

Furthermore, the photovoltaic module is also provided with a light-transmitting glass plate arranged on one side of the front surface of the battery string and a back plate arranged on the back surface of the battery string.

Further, the thickness of the back plate is 0.25-0.35mm, and the distance between the upper surface of the light-transmitting glass plate and the lower surface of the back plate is 4-5 mm.

Furthermore, the photovoltaic module is provided with a rectangular frame arranged on the periphery, and at least one reinforcing rod connected with a pair of long edges of the rectangular frame.

Furthermore, the photovoltaic module is provided with a rectangular frame arranged on the periphery, and the photovoltaic module is also provided with at least one reinforcing rod connected with a pair of short edges of the rectangular frame.

Furthermore, the half-chip battery is provided with main grids which are positioned on the front surface and are connected by welding strips, and each main grid is provided with a plurality of welding pads; in each half cell, the light receiving surface section of the welding strip connected to the front surface of the half cell points to the direction of the backlight surface section, the last welding pad has a first distance with the rear side edge of the half cell, the first welding pad has a second distance with the front side edge of the half cell, and the first distance is larger than the second distance.

Further, the first distance is 9-16 mm.

Further, the difference between the first distance and the second distance ranges from 3mm to 6 mm.

Further, the number of the bonding pads on each main grid is 6-10.

The utility model has the advantages that: based on the utility model provides a technical scheme can further improve photovoltaic module's power compared with prior art, and then can be better satisfy the trade to photovoltaic module's high power demand.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic front view of an embodiment of a photovoltaic module according to the present invention;

FIG. 2 is an enlarged partial schematic view of the photovoltaic module of FIG. 1 showing the mating of the strings;

FIG. 3 is a schematic view of the half cell and solder strip combination;

FIG. 4 is a schematic illustration of a partial explosion cut through a photovoltaic module along the length of a string of cells;

FIG. 5 is another schematic illustration of a partial explosion of a photovoltaic module cut along the length of a string of cells;

FIG. 6 is a schematic view of the back side of the photovoltaic module shown in FIG. 1;

FIG. 7 is a schematic electrical circuit diagram of the photovoltaic module of FIG. 1;

fig. 8 is a schematic front view of another embodiment of the photovoltaic module of the present invention.

In the drawing, 100 is a half cell, 101 is a first half cell, 102 is a second half cell, 11 is a main grid, 110 is a bonding pad, 1101 is a first bonding pad, 1102 is a second bonding pad, 111 is a rear side edge, 112 is a front side edge, 200 is a bonding tape, 21 is a light receiving surface section, 22 is a backlight surface section, 210 is a transition section, 31 is an upper packaging adhesive film, 32 is a lower packaging adhesive film, 41 is a glass cover plate, 42 is a back plate, 500 is a frame, and 51 is a reinforcing rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely 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, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the photovoltaic module of the present invention includes a plurality of cell strings, each cell string includes a plurality of half-cells 100 connected in series in sequence. The utility model discloses the length direction of its place battery cluster of long limit extending direction perpendicular to of half 100 of well battery, and the long limit size of half battery is 200 and supplyes 235 mm. As will be readily understood from fig. 3, the half cell 100 refers to a cell having a length of a long side twice as long as a length of a narrow side, and is generally formed by half-cutting a square positive cell; in the illustrated planar coordinate system, the extending direction of the long side of the half cell 100 is the direction of the X axis, and the length direction of the cell string is the direction of the Y axis.

Based on the technical scheme that the utility model provides a half battery for the size is bigger than prior art for the battery piece of preparation photovoltaic module, and prior art can further improve photovoltaic module's power relatively, and then can be better satisfy the trade to photovoltaic module's high power demand.

Referring to fig. 3 and 4 or fig. 3 and 5, the battery string has a solder strip 200 connecting two adjacent half-cell 100, the solder strip 200 includes a light receiving section 21 and a backlight section 22, the light receiving section 21 is connected to the front surface of one of the two adjacent half-cell 100, and the backlight section 2 is connected to the back surface of the other of the two adjacent half-cell 100. Specifically, in the illustrated embodiment, the two adjacent half cells 100 include a first half cell 101 and a second half cell 102, wherein the light receiving surface segment 2 of the solder strip 200 is connected to 1 the front surface of the first half cell 101, and the backlight surface segment 22 of the solder strip 200 is connected to the back surface of the second half cell 102.

As shown in fig. 3, the width of at least a part of the light receiving surface section 21 is smaller than the width of the backlight section 22. Based on this setting, can reduce to a certain extent and weld the sheltering from of taking 200 can the positive photic area of photovoltaic module, improve half cell 100's photoproduction current.

In a preferred embodiment, the light receiving surface section 21 further has a transition section 210 connected to the backlight section 22, and the width of the transition section 210 gradually increases from the light receiving surface section 21 to the backlight section 22. In practice, the widest end of the transition section 210 is connected to the backlight section 22, and the width of the main portion of the light receiving surface section 21 excluding the transition section 210 is generally uniform, and the width is consistent with the width of the narrowest end of the transition section 210.

In the utility model, the width of the narrowest part of the light receiving surface section 21 is 0.2-0.4mm, and the width of the backlight surface section is 0.6-1.2 mm. Specifically, in the embodiment shown in fig. 3, the width of the main portion of the light receiving section 21 excluding the transition section 210 is 0.2-0.4mm, and the widest end of the transition section 210 has a width dimension that is consistent with the width dimension of the backlight section 22.

In the present invention, referring to fig. 4 and 5, the thickness of the backlight section 22 of the solder ribbon 200 is equal to or less than the thickness of the light receiving surface section 21. I.e., the thickness of the backlight section 22 is not greater than the thickness of the light receiving section 21. Based on this arrangement, the probability of splitting of the half-cell 100 due to an excessive thickness of the backlight section 22 can be greatly reduced when the photovoltaic module is formed by specific lamination.

Referring to fig. 4 and 5, the thickness of the backlight section 22 corresponds to the thinnest portion of the light receiving surface section 21. Specifically, in the direction in which the light receiving surface section 21 points toward the backlight section 22, the transition section 210 of the light receiving surface section 21 for connecting the backlight section 22 has a gradually decreasing thickness, and the end portion of the transition section 210 having the smallest thickness is connected to the backlight section 22, and the thickness of the main portion of the light receiving surface section 21 excluding the transition section 210 is equal to the thickness of the end portion having the largest thickness of the transition section 210.

In a specific implementation, the thickness of the backlight section 22 is 0.08-0.25 mm. Further, the thickness of the light receiving surface section is 0.1-0.4 mm.

It is understood that in the practice of the present invention, the transition section 210 is disposed entirely on the front surface of the corresponding half cell 100 and does not extend to the back surface of the adjacent half cell 100. Referring to fig. 4 and 5, regardless of whether the two adjacent half cells 100 are stacked or spaced, the transition section 210 is completely disposed on the front surface of the first half cell 101, and there is no portion extending to the back surface of the second half cell 102, so that the portion of the solder strip 100 between the two adjacent half cells 100 has a relatively thin thickness, and the probability of damage to the half cells 100 during the lamination of the photovoltaic module can be reduced.

In a preferred embodiment of the present invention, a cross-sectional shape of a part of the light receiving surface section 21 is a circle, a triangle, or a trapezoid, and the backlight surface section 22 is a flat shape. More specifically, in a preferred embodiment, the main body portion of the light receiving surface section 21 has a circular, triangular or trapezoidal cross-section. Therefore, sunlight irradiated to the main body of the light receiving surface section 21 can be further reflected to be absorbed by the half cell 100, and the light generation current of the half cell 100 can be further improved, and the flat arrangement mode of the backlight surface section 22 can also greatly reduce the damage probability of the half cell 100 when the photovoltaic module is laminated.

Referring to fig. 4 and 5, the photovoltaic module of the present invention further includes an upper packaging adhesive film 31 disposed on one side of the front surface of the battery string and a lower packaging adhesive film 32 disposed on one side of the back surface of the battery string, wherein the thickness of the upper packaging adhesive film 31 is greater than the thickness of the lower packaging adhesive film 32. It is understood that the thickness of the encapsulant film (including the upper encapsulant film 31 and the lower encapsulant film 32) refers to the thickness of the encapsulant film on the surface of the half-cell 100 where the solder strip 200 is not disposed after the photovoltaic module is laminated.

The utility model discloses in, especially to the implementation structure that light receiving face section 21 thickness is big in relative backlight face section 22 thickness, the thickness of going up encapsulation glued membrane 31 is greater than the thickness size matching that the thickness of lower encapsulation glued membrane 32 can be better with solder strip 200, can effectively reduce photovoltaic module laminate moulding in-process half 100's of battery impaired probability.

In the specific implementation process, preferably, the thickness of the upper packaging adhesive film 31 is 0.35-0.7mm, and the thickness of the lower packaging adhesive film 32 is 0.18-0.6 mm.

In the present invention, the half-cell 100 concerned has a front electrode on the front side, wherein the front electrode has 10 to 15 main grids 11 extending in the same direction as the length direction of the corresponding cell string.

Referring to fig. 3, there is shown a preferred embodiment of the present invention, in which the front electrode has 12 main grids 11 extending in the same direction as the length direction of the corresponding cell string, wherein the distance D3 between two adjacent main grids 11 is 16-18 mm.

Furthermore, in each battery string of the present invention, the distance d1 between two adjacent half batteries 100 is-0.5-2.0 mm. Specifically, the adjacent two half-cells 100 may overlap with each other or may be spaced apart from each other. Referring to fig. 2 and 4, in each battery string of this embodiment, two adjacent half-cells 100 are in an overlapping arrangement, that is, two adjacent sides have an overlap with a certain width, and the width d1 of the overlap is not more than 0.5mm (corresponding to a spacing of-0.5-0 mm); referring to fig. 4, in each battery string of this embodiment, two adjacent half batteries 100 are spaced apart from each other, i.e., two adjacent sides do not overlap, and the distance d1 between two adjacent edges is not greater than 2.0mm (corresponding to a distance of 0-2.0 mm).

Further, in the present invention, at least two battery strings are arranged side by side in the width direction, as shown in fig. 2, and the distance d2 between two adjacent battery strings arranged side by side is 1.0-3.0 mm.

As the utility model discloses photovoltaic module's preferred version type, it is shown with reference to fig. 1, photovoltaic module includes that two sets of battery cluster groups that are the symmetry and set up with a symmetry axis L, and each battery cluster group includes 6 battery clusters that set up side by side in proper order on battery cluster width direction, and the battery cluster that constitutes two battery cluster groups sets up in the both sides one-to-one of symmetry axis L. Fig. 7 shows a schematic circuit diagram of the photovoltaic module shown in fig. 1, in which each cell string has 10 half-cells 100 connected in series.

In another embodiment of the present invention, referring to fig. 8, the difference from the embodiment shown in fig. 1 and 7 is that each battery string in this embodiment has 11 half batteries 100 connected in series in sequence.

Referring to fig. 4 and 5, the photovoltaic module further has a transparent glass plate 41 disposed on the front side of the cell string and a back plate 42 disposed on the back side of the cell string. Specifically, the transparent glass plate 41 is disposed on the upper side of the upper encapsulant film 31, and the back plate 42 is disposed on the lower side of the lower encapsulant film 32. Preferably, the photovoltaic module is a single glass module, and the back plate 42 is made of a polymer composite material, which has excellent air and moisture barrier properties. It is understood that in other embodiments of the present invention, the photovoltaic module can also be a dual glass module, i.e. the back plate 42 is replaced by a transparent glass plate.

In the specific implementation process, the thickness of the back plate is 0.25-0.35mm, and the distance between the upper surface of the light-transmitting glass plate and the lower surface of the back plate is 4-5 mm.

The utility model discloses the parameter that provides above can ensure that photovoltaic module has better output through experimental verification, is the utility model discloses an optimal implementation mode.

Referring to fig. 1, 6 and 8, the photovoltaic module of the present invention further has a rectangular frame 500 disposed on the periphery, the rectangular frame 500 can protect the module body disposed inside the rectangular frame 500, and the rectangular frame 500 and the module body are bonded by silica gel.

Referring to fig. 6, the photovoltaic module further has at least one stiffener 51 connecting a pair of long sides of the rectangular border 500. It is easy to select the reinforcing rods preferably disposed on the back of the back plate 42, so as to effectively avoid affecting the light receiving area of the front surface of the photovoltaic module.

In other embodiments of the present invention, the stiffener 51 may also connect a pair of short sides (not shown) of the rectangular frame 500. It is of course understood that in still other embodiments, the photovoltaic module has stiffeners connecting a pair of long sides of the rectangular border 500 and stiffeners connecting a pair of short sides of the rectangular border 500 (not shown).

As a further preferred embodiment of the present invention, referring to fig. 3, each main grid 11 of the half cell 100, which is located on the front side and connected by the solder strip 200, has a plurality of solder pads 110. In each half cell 100, in a direction (i.e., a direction opposite to the positive direction of the Y axis in fig. 3) from the light receiving surface section 21 of the solder ribbon 200 connected to the front surface thereof toward the backlight surface 22 section, a first distance D1 is provided between the last land 110 and the rear side edge 111 of the half cell 100, and a second distance D2 is provided between the first land 110 and the front side edge 112 of the half cell 100. As shown in fig. 3, it is easy to understand that the last bonding pad 110 is the first bonding pad 1101, and the first bonding pad 110 is the second bonding pad 1102, in the direction from the light receiving surface section 21 of the solder ribbon 200 connected to the front surface thereof to the section of the backlight surface 22.

Preferably, the first distance D1 is greater than the second distance D2. Thus, when the half-cell 100 is specifically applied to a photovoltaic module, every two adjacent half-cells 100 in a cell string of the photovoltaic module are connected through the solder strip 200 with a certain length, and the position of the first pad 1101 can be closer to the center of the half-cell 100, so that the starting solder point of the solder strip 200 can be closer to the center of the half-cell 100 when the solder strip 200 is welded, thereby effectively reducing the length of the solder strip 200, reducing the loss of an interconnected structural member, and further reducing the cost of the photovoltaic module; the relatively small distance between second pad 1102 and second edge 112 ensures a bonding tension of bonding ribbon 200 at second pad 2112.

In some embodiments of the present invention, the first distance D1 is 9-16 mm.

Further, as a further preferred aspect of the present invention, the difference between the first distance D1 and the second distance D2 is in the range of 3 to 6 mm. Namely, D1-D2 is more than or equal to 3mm and less than or equal to 6 mm.

Further, in some preferred embodiments of the present invention, the number of the pads 110 on each main gate 11 is 6 to 10. For example, in the embodiment shown in fig. 3, there are 8 pads 110 on each main gate 11.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (24)

1. A photovoltaic module comprises a plurality of cell strings and is characterized in that each cell string comprises a plurality of half cells which are sequentially connected in series, the extending direction of the long edge of each half cell is perpendicular to the length direction of the cell string where the half cell is located, and the size of the long edge of each half cell is 200 mm and 235 mm.

2. The assembly according to claim 1, wherein the string has a solder strip connecting two adjacent half cells, the solder strip includes a light receiving section and a backlight section, the light receiving section is connected to the front surface of one of the two adjacent half cells, the backlight section is connected to the back surface of the other of the two adjacent half cells, and the width of at least a portion of the light receiving section is smaller than the width of the backlight section.

3. The photovoltaic module according to claim 2, wherein the light receiving surface section has a transition section connected to the backlight section, and the width of the transition section is gradually increased in a direction from the light receiving surface section to the backlight section.

4. The photovoltaic module according to claim 2, wherein the narrowest width of the light receiving surface section is 0.2-0.4mm, and the width of the backlight section is 0.6-1.2 mm.

5. The photovoltaic module according to claim 2, wherein a thickness of the backlight section is equal to or less than a thickness of the light receiving surface section.

6. The photovoltaic module according to claim 5, wherein the thickness of the backlight section is equal to the thickness of the thinnest part of the light receiving surface section.

7. The photovoltaic module of claim 5, wherein the thickness of the backlight section is 0.08-0.25 mm.

8. The photovoltaic module of claim 5, wherein the thickness of the light receiving surface section is 0.1-0.4 mm.

9. The photovoltaic module according to any one of claims 2 to 8, wherein a cross-sectional shape of a part of the light receiving surface section is a circle, a triangle or a trapezoid, and the backlight surface section is a flat shape.

10. The photovoltaic module according to any one of claims 1 to 8, further comprising an upper encapsulant film disposed on a front side of the cell string and a lower encapsulant film disposed on a back side of the cell string, wherein a thickness of the upper encapsulant film is greater than a thickness of the lower encapsulant film.

11. The photovoltaic module of claim 10, wherein the upper encapsulant film has a thickness of 0.35-0.7mm and the lower encapsulant film has a thickness of 0.18-0.6 mm.

12. The assembly according to any one of claims 1 to 8, wherein the half-cells have a front electrode on the front side, the front electrode having 10 to 15 main grids extending in the same direction as the length of the corresponding string.

13. The photovoltaic module of claim 12, wherein the front electrode has 12 main grids, and the distance between two adjacent main grids is 16-18 mm.

14. The photovoltaic module according to any one of claims 1 to 8, wherein the distance between two adjacent half cells in each cell string is-0.5 mm to 2.0 mm.

15. The photovoltaic module according to any one of claims 1 to 8, wherein at least two of the cell strings are arranged side by side in a width direction thereof, and a distance between two adjacent cell strings arranged side by side is 1.0 to 3.0 mm.

16. The pv module according to claim 15 wherein the pv module comprises two sets of cell strings symmetrically disposed about a symmetry axis, each of the cell strings includes 6 cell strings sequentially disposed side-by-side in a width direction of the cell string, and the cell strings forming the two cell string sets are disposed in a one-to-one correspondence on two sides of the symmetry axis.

17. The assembly according to any one of claims 1 to 8, further comprising a light-transmitting glass plate disposed on a front side of the string and a back plate disposed on a back side of the string.

18. The photovoltaic module of claim 17, wherein the thickness of the backsheet is 0.25-0.35mm and the distance between the upper surface of the light-transmissive glass sheet and the lower surface of the backsheet is 4-5 mm.

19. The assembly according to any one of claims 1-8, wherein the assembly has a rectangular peripheral frame, and further comprising at least one stiffener connecting a pair of long sides of the rectangular peripheral frame.

20. The assembly according to any one of claims 1-8, wherein the assembly has a rectangular peripheral frame, and wherein the assembly further has at least one stiffener connecting a pair of short sides of the rectangular peripheral frame.

21. The photovoltaic module according to any one of claims 2 to 8, wherein the half-cell has a main grid on the front side for solder ribbon connection, each main grid having a plurality of solder pads; in each half cell, the light receiving surface section of the welding strip connected to the front surface of the half cell points to the direction of the backlight surface section, the last welding pad has a first distance with the rear side edge of the half cell, the first welding pad has a second distance with the front side edge of the half cell, and the first distance is larger than the second distance.

22. The photovoltaic module of claim 21, wherein the first distance is 9-16 mm.

23. The photovoltaic module of claim 21, wherein the first distance differs from the second distance by a value in a range of 3-6 mm.

24. The assembly defined in claim 21 wherein the number of said bonding pads on each said primary grid is 6-10.

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