CN210778625U

CN210778625U - Photovoltaic module suitable for jumbo size solar cell

Info

Publication number: CN210778625U
Application number: CN201921658975.8U
Authority: CN
Inventors: 陈雪; 张舒; 王乐
Original assignee: Trina Solar Co Ltd
Current assignee: Trina Solar Changzhou Technology Co ltd; Trina Solar Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-16
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a photovoltaic module suitable for jumbo size solar cell, wherein, the solar wafer layer is the jumbo size solar cell who forms through the series connection and/or parallelly connected back by a plurality of small batteries that form through the cutting, connects its characterized in that through welding the area between the small battery: the small-chip battery is cut into 3-10 equally-divided small chips by battery chips with the side length size range of 160-220mm, the number of the main grids is 5-22, and the cross section width of the welding strip is 0.2-0.5 mm. The utility model discloses the design of having comprehensively considered battery and subassembly structure two aspects welds and takes the main bars and welds the combination of taking the size to obtain the optimum collocation, has effectively increased the collection ability of main bars to the electric current, has reduced resistive loss simultaneously, and the shading loss still less obtains optimum optics and electricity utilization ratio for subassembly power realizes the maximize at jumbo size battery power, simultaneously through reasonable setting EVA glued membrane thickness, the effectual probability that has reduced the latent crack.

Description

Photovoltaic module suitable for jumbo size solar cell

Technical Field

The utility model belongs to the technical field of solar energy, concretely relates to photovoltaic module suitable for jumbo size solar cell.

Background

The conventional common solar module is generally divided into a whole piece or a whole piece by laser, the size of a cell is more than 156.75 x 156.75mm, and then the cell is connected in series or in series-parallel to form a circuit, along with the continuous improvement of the market on the demand of a high-power module, under the condition that the improvement effect of the conventional cell technology is gradually limited, the area of a silicon wafer is increased, a large silicon wafer is introduced, and the shortcut for quickly improving the power and the efficiency of the module is gradually formed. Meanwhile, various high-efficiency photovoltaic technologies are diversified, and typically, a multi-main-grid cell assembly, a half-cutting assembly for cutting a cell slice into halves, and a stack assembly for cutting the cell slice into a plurality of small slices are adopted, and a technology called parallel slice welding connected through a welding strip is also started to be common.

However, the highest design of the battery efficiency does not mean that the optimal power can be obtained after the design of the matched components, because the solder strip shading and resistance and the component model design of the components also have influence on the component power, for example, the number of the main grids is increased, the solder strip resistance can be reduced according to a resistance calculation formula, but the shading area is also increased, so that the increase of the number of the main grids is not paid for. In the sliced battery assembly, if the current is reduced by half after the battery piece is cut into halves, the resistance loss influence brought by the welding strip is changed into 1/4 of the whole piece, and correspondingly, the proportion occupied by the shading loss influence brought by the welding strip is increased, so that the design of the size of the welding strip and the number of the main grids which are suitable for the whole piece is not suitable for the half-piece assembly any more. Similarly, assuming that the battery piece is cut into 3 parts, the current becomes 1/3, and the resistance loss becomes 1/9 of a whole piece, which means that the resistance loss accounts for the package loss of the assembly, while the relative proportion of the shading loss of the solder strip increases, and the more the battery piece is cut, the lower the current is, which means that the power loss caused by the resistance of the solder strip of the assembly becomes smaller and smaller, and the proportion of the shading loss of the solder strip becomes relatively larger.

Therefore, as the size of the silicon chip becomes larger and various overlay techniques are applied, the number of main gates and the size of the solder strips need to be redesigned. More laminated sheets and combined sheets are cut aiming at half-sheet and whole solar cell sheets, the number of the required main grids and the size of the solder strip are different, and the corresponding process technological requirements are also different. Therefore, for the improvement of the cell process, the corresponding design of the assembly is needed, so that the efficient cell ultimately forms the efficient photovoltaic assembly.

Disclosure of Invention

In order to solve the problem, the utility model provides a photovoltaic module suitable for jumbo size solar cell through the design and the selection to solder strip and main bars quantity, realizes jumbo size solar cell photovoltaic module's efficiency optimization.

Therefore, the utility model adopts the following technical scheme:

a photovoltaic module suitable for large-size solar cells comprises a plurality of solar cells which are sequentially stacked and laminated from top to bottom: the solar module comprises upper glass (1), a transparent EVA front film (2), a solar cell sheet layer (3), an EVA rear film (4), a back plate or photovoltaic glass (5), wherein the upper glass (1), the transparent EVA front film (2), the solar cell sheet layer (3), the EVA rear film (4), the back plate or the photovoltaic glass (5) are bonded together through a laminating machine to form a module body (100), and the upper glass (1) is coated glass and is an illuminated surface; a frame (7) is arranged on the periphery of the winding component body (100), and the frame (7) is bonded with the component body through a sealant (6);

the solar cell sheet layer (3) is a large-size solar cell formed by connecting a plurality of cut small cells (101) in series and/or in parallel, the small cells (101) are connected through solder strips (10), and the small cells (101) are collected and led out through a main grid, and the solar cell sheet layer is characterized in that: the small-chip battery (101) is cut into 3-10 equally-divided small chips by battery chips with the side length size range of 160-220mm, the number of the main grids is 5-22, and the cross section width of the welding strip (10) is 0.2-0.5 mm.

Further, the cross section of the welding strip (10) is circular, rectangular or triangular.

Furthermore, the welding strip (10) is a copper welding strip with a circular cross section, the surface of the copper welding strip is plated with tin-lead alloy, and the diameter of the cross section of the welding strip (10) is 0.2-0.5 mm.

Further, the thicknesses of the transparent EVA front film (2) and the EVA rear film (4) are controlled as follows: the height of the solder strip is added by 0.1 to 0.3 mm.

As a specific implementation mode, the small-sized cell (101) is cut into 3 equal parts by a cell slice with the side length of 160-170mm, the number of the main grids is 5-15, the welding strip (10) is a copper welding strip with a circular cross section, and the cross section diameter of the welding strip (10) is 0.25mm-0.45 mm.

As a more preferable embodiment, the cross section diameter of the welding strip (10) is 0.4mm, and the number of the main grids is 7; or the diameter of the cross section of the welding strip (10) is 0.35mm, and the number of the main grids is 8; or the diameter of the cross section of the welding strip (10) is 0.32mm, and the number of the main grids is 9; or the diameter of the cross section of the welding strip (10) is 0.29mm, and the number of the main grids is 9; or the diameter of the cross section of the welding strip (10) is 0.25mm, and the number of the main grids is 11.

As a specific implementation mode, the small-sized cell (101) is cut into 3 equal parts by a cell slice with the side length of 200-210mm, the number of the main grids is 8-22, and the cross section diameter of the welding strip (10) is 0.25-0.45 mm.

As a more preferable embodiment, the cross section diameter of the welding strip (10) is 0.4mm, and the number of the main grids is 11; or the diameter of the cross section of the welding strip (10) is 0.35mm, and the number of the main grids is 12; or the diameter of the cross section of the welding strip (10) is 0.32mm, and the number of the main grids is 13; or the diameter of the cross section of the welding strip (10) is 0.29mm, and the number of the main grids is 14; or the diameter of the cross section of the welding strip (10) is 0.25mm, and the number of the main grids is 16.

As a specific implementation mode, the small-sized cell (101) is cut into 5 equal parts by a cell slice with the side length of 200-210mm, the number of the main grids is 7-19, and the cross section diameter of the welding strip (10) is 0.25-0.45 mm.

As a more preferable embodiment, the cross section diameter of the welding strip (10) is 0.4mm, and the number of the main grids is 9; or the diameter of the cross section of the welding strip (10) is 0.35mm, and the number of the main grids is 10; or the diameter of the cross section of the welding strip (10) is 0.3mm, and the number of the main grids is 11; or the diameter of the cross section of the welding strip (10) is 0.25mm, and the number of the main grids is 12; or the cross section diameter of the welding strip (10) is 0.22mm, and the number of the main grids is 14.

Compared with the prior art, the utility model discloses the design of having comprehensively considered battery and subassembly structure two aspects welds and takes the main bars and welds the combination of taking the size to obtain the optimum collocation, has effectively increased the main bars to the collection ability of electric current, has reduced resistive loss simultaneously, and the shading loss still less obtains optimum optics and electricity utilization ratio for the power realization maximize is gone up to the jumbo size battery to the subassembly power, simultaneously through the reasonable EVA glued membrane thickness that sets up, the effectual probability that has reduced the latent crack. The high-efficiency battery is finally a high-efficiency battery assembly.

Drawings

Fig. 1-3 are schematic structural views of the present invention, wherein fig. 1 is a schematic sectional view, fig. 2 is a schematic front view of the module, and fig. 3 is a schematic back view of the module;

fig. 4 is a power diagram of the module of embodiment 1 of the present invention;

fig. 5 is a power diagram of the module according to embodiment 2 of the present invention;

fig. 6 is a power diagram of the module according to embodiment 3 of the present invention;

wherein: 1 is last glass, 2 is transparent EVA front film, 3 is the solar wafer layer, 4 is the membrane behind the EVA, 5 is backplate or photovoltaic glass, 6 is sealed glue, 7 is the frame, 8 is the terminal box, 9 is the busbar, 10 is the solder strip, 100 is the subassembly body, 101 is the small cell.

Detailed Description

Example 1

As shown in fig. 1-3, the utility model provides a photovoltaic module suitable for jumbo size solar cell, including from top to bottom superpose in proper order and through the lamination: the solar module comprises upper glass 1, a transparent EVA front film 2, a solar cell sheet layer 3, an EVA rear film 4, a back plate or photovoltaic glass 5, wherein the upper glass 1, the transparent EVA front film 2, the solar cell sheet layer 3, the EVA rear film 4, the back plate or photovoltaic glass 5 are bonded together through a laminating machine to form a module body 100, and the upper glass 1 is coated glass and is a light receiving surface; the periphery of winding subassembly body 100 is provided with frame 7, bonds by sealed glue 6 between frame 7 and the subassembly body, and in this embodiment, frame 7 is the aluminium frame.

The solar cell sheet layer 3 is a large-size solar cell formed by connecting a plurality of cut small cells 101 in series and/or in parallel, the small cells 101 are connected through solder strips 10, a junction box 8 is arranged on the back plate or the back glass 5, a bus bar 9 penetrates through a preset hole of the back plate or the back glass to be connected with the junction box 8, and the bus bar 9 is connected with the solder strips 10 to form a finished circuit loop among the small cells 101.

Specifically, the small-sized cell 101 is cut into 3 equally divided small pieces from a cell piece with the side length size range of 160-170 mm.

The thicknesses of the transparent EVA front film 2 and the EVA rear film 4 are controlled as follows: the height of the solder strip is added by 0.1 to 0.3 mm. The thickness has the optimal effect, and the problems of hidden cracking and glue overflow can be effectively avoided, such as too thick glue film and easy glue overflow, and such as too thin glue film and easy cell fragment or hidden cracking.

If only the battery is considered, the number of the main grids is preferably 6-16, and the number of the main grids is preferably 6-9 in view of cost and complexity of engineering process. If the cell design is not considered, only the component design is considered, in order to obtain minimal optical and electrical losses,

when a 0.4mm circular brazing strip is adopted, the number of the selectable main grids is 3-10, and the preferred range is 3-6; however, after combining the optical and electrical properties of the module and cell, the number of optional primary grid designs should be 5-10, preferably 5-7, and the module power can be maximized in the 7-grid design. Compared with the traditional rectangular solder strip, the optical utilization rate of the circular solder strip is improved by about 54 percent, and the optical loss is reduced.

The thicker the belt size, the fewer the number of required optimal main grids; when the more the fraction of the battery piece is cut, the fewer the number of the main grids is needed, and the smaller the size of the welding strip can be used.

When using 0.35mm round braze strips, the number of alternative primary grid designs is 4-12, preferably in the range of 4-7, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 6-11, preferably in the range of 6-8, and the module power can be maximized at 8 designs.

When using 0.32mm round braze strips, the number of alternative primary grid designs is 5-13, preferably in the range of 5-8, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 6-12, preferably in the range of 6-9, and the module power can be maximized at 9 designs.

When using 0.29mm circular braze strips, the number of alternative primary grid designs is 6-15, preferably in the range of 6-9, if only the module design is considered, but after combining the optical and electrical performance of the module and the cell, the number of alternative primary grid designs should be 7-13, preferably in the range of 7-9, and the module power can be maximized at 9 designs.

When using 0.25mm round braze strips, the number of alternative primary grid designs is 8-19, preferably in the range of 8-12, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 8-15, preferably in the range of 8-11, and the module power can be maximized at 11 designs.

The specific parameter design in this example is as follows in table 1:

through practical tests, in this embodiment, the power of the component obtained by setting different numbers of main gates and sizes of solder strips is as shown in fig. 4.

Example 2:

the present embodiment is different from embodiment 1 in that:

the small-scale cell 101 is cut into 3 equal-scale small-scale pieces by a cell slice with the side length size range of 200-210 mm.

If only the battery is considered, the number of the optional main grids is designed to be 8-21, and the number of the main grids is preferably in the range of 8-13 from the aspects of cost and complexity of engineering process; if the cell design is not considered and only the module design is considered, in order to obtain the minimum optical and electrical loss, when the 0.4mm circular brazing strip is adopted, the number of the optional main grids is 6-14, and the preferred range is 6-9, but after the optical and electrical performances of the module and the cell are combined, the number of the optional main grids is 8-15, and the preferred range is 8-11, and the module power can be maximized in the 11 designs.

When using 0.35mm round braze strips, the number of alternative primary grid designs is 8-17, preferably in the range of 8-11, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 9-16, preferably in the range of 9-12, and the module power can be maximized at 12 designs.

When using 0.32mm round braze strips, the number of alternative primary grid designs is 9-20, preferably in the range of 9-13, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 10-18, preferably in the range of 10-13, and the module power can be maximized at 13 designs.

When using 0.29mm circular braze strips, the number of alternative primary grid designs is 10-23, preferably in the range of 10-15, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 11-19, preferably in the range of 11-14, and the module power can be maximized at 14 designs.

When using 0.25mm round braze strips, the number of alternative primary grid designs is 13-29, preferably in the range of 13-19, if only the module design is considered, but after combining the optical and electrical performance of the module and the cell, the number of alternative primary grid designs should be 12-22, preferably in the range of 12-16, and the module power can be maximized at 16 designs. The specific parameters in this embodiment are designed as follows

Table 2:

through practical tests, in this embodiment, the power of the component obtained by setting different numbers of main gates and sizes of solder strips is as shown in fig. 5.

Example 3:

the present embodiment is different from embodiment 1 in that:

the small-piece cell 101 is cut into 5 equally-divided small pieces by a cell piece with the side length size range of 200-210 mm.

If only the battery is considered, the number of the optional main grids is designed to be 8-21, and the number of the main grids is preferably in the range of 8-13 from the aspects of cost and complexity of engineering process; if the cell design is not considered and only the module design is considered, in order to obtain the minimum optical and electrical loss, when a 0.4mm circular brazing tape is used, the number of the optional main grids is 3-10, and the preferred range is 3-5, but after the optical and electrical properties of the module and the cell are integrated, the number of the optional main grids is 7-13, and the preferred range is 7-9, and the module power can be maximized in 9 designs.

When using 0.35mm round braze strips, the number of alternative primary grid designs is 4-12, preferably in the range of 4-7, if only the module design is considered, but after combining the optical and electrical performance of the module and cell, the number of alternative primary grid designs should be 7-14, preferably in the range of 7-10, and the module power can be maximized at 10 designs.

When using 0.30mm round braze strips, the number of alternative primary grid designs is 5-15, preferably in the range of 5-9, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 8-15, preferably in the range of 8-11, and the module power can be maximized at 11 designs.

When using 0.25mm round braze strips, the number of alternative primary grid designs is 8-20, preferably in the range of 8-11, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 9-17, preferably in the range of 9-12, and the module power can be maximized at 12 designs.

When using 0.25mm round braze strips, the number of alternative primary grid designs is 9-24, preferably in the range of 9-14, if only the module design is considered, but after combining the optical and electrical performance of the module and the battery, the number of alternative primary grid designs should be 10-19, preferably in the range of 10-14, and the module power can be maximized at 14 designs.

The specific parameter design in this example is as follows in table 3:

through practical tests, in this embodiment, the power of the component obtained by setting different numbers of main gates and sizes of solder strips is as shown in fig. 6.

It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims. According to the utility model provides a configuration scheme of main bars quantity and solder strip size can carry out various configurations to make the subassembly reach the highest efficiency.

Claims

1. A photovoltaic module suitable for large-size solar cells comprises a plurality of solar cells which are sequentially stacked and laminated from top to bottom: the solar module comprises upper glass (1), a transparent EVA front film (2), a solar cell sheet layer (3), an EVA rear film (4), a back plate or photovoltaic glass (5), wherein the upper glass (1), the transparent EVA front film (2), the solar cell sheet layer (3), the EVA rear film (4), the back plate or the photovoltaic glass (5) are bonded together through a laminating machine to form a module body (100), and the upper glass (1) is coated glass and is an illuminated surface; a frame (7) is arranged on the periphery of the winding component body (100), and the frame (7) is bonded with the component body through a sealant (6);

the solar cell sheet layer (3) is a large-size solar cell formed by connecting a plurality of cut small cells (101) in series and/or in parallel, the small cells (101) are connected through solder strips (10), and the small cells (101) are connected with each other through a main grid to collect and guide current, and the solar cell sheet layer is characterized in that: the small-chip battery (101) is cut into 3-10 equally-divided small chips by battery chips with the side length size range of 160-220mm, the number of the main grids is 5-22, and the cross section width of the welding strip (10) is 0.2-0.5 mm.

2. The photovoltaic module of claim 1, wherein: the cross section of the welding strip (10) is circular, rectangular or triangular.

3. The photovoltaic module of claim 2, wherein: the welding strip (10) is a copper welding strip with a circular cross section, the surface of the copper welding strip is plated with tin-lead alloy, and the diameter of the cross section of the welding strip (10) is 0.2-0.5 mm.

4. The photovoltaic module of claim 1, wherein: the thicknesses of the transparent EVA front film (2) and the EVA rear film (4) are controlled as follows: the height of the solder strip is added by 0.1 to 0.3 mm.

5. The photovoltaic module of claim 3, wherein: the small-sized battery (101) is cut into 3 equal parts by battery pieces with the side length of 160-170mm, the number of the main grids is 5-15, the welding strip (10) is a copper welding strip with a circular cross section, and the diameter of the cross section of the welding strip (10) is 0.25-0.45 mm.

6. The photovoltaic module of claim 5, wherein: the diameter of the cross section of the welding strip (10) is 0.4mm, and the number of the main grids is 7; or the diameter of the cross section of the welding strip (10) is 0.35mm, and the number of the main grids is 8; or the diameter of the cross section of the welding strip (10) is 0.32mm, and the number of the main grids is 9; or the diameter of the cross section of the welding strip (10) is 0.29mm, and the number of the main grids is 9; or the diameter of the cross section of the welding strip (10) is 0.25mm, and the number of the main grids is 11.

7. The photovoltaic module of claim 3, wherein: the small battery (101) is cut into 3 equal parts by a battery piece with the side length of 200-210mm, the number of the main grids is 8-22, and the diameter of the cross section of the welding strip (10) is 0.25-0.45 mm.

8. The photovoltaic module of claim 7, wherein: the diameter of the cross section of the welding strip (10) is 0.4mm, and the number of the main grids is 11; or the diameter of the cross section of the welding strip (10) is 0.35mm, and the number of the main grids is 12; or the diameter of the cross section of the welding strip (10) is 0.32mm, and the number of the main grids is 13; or the diameter of the cross section of the welding strip (10) is 0.29mm, and the number of the main grids is 14; or the diameter of the cross section of the welding strip (10) is 0.25mm, and the number of the main grids is 16.

9. The photovoltaic module of claim 3, wherein: the small battery (101) is cut into 5 equal parts by a battery piece with the side length of 200-210mm, the number of the main grids is 7-19, and the diameter of the cross section of the welding strip (10) is 0.25-0.45 mm.

10. The photovoltaic module of claim 9, wherein: the diameter of the cross section of the welding strip (10) is 0.4mm, and the number of the main grids is 9; or the diameter of the cross section of the welding strip (10) is 0.35mm, and the number of the main grids is 10; or the diameter of the cross section of the welding strip (10) is 0.3mm, and the number of the main grids is 11; or the diameter of the cross section of the welding strip (10) is 0.25mm, and the number of the main grids is 12; or the cross section diameter of the welding strip (10) is 0.22mm, and the number of the main grids is 14.