CN210866208U

CN210866208U - Solar cell module capable of reducing electrical loss of laminating part

Info

Publication number: CN210866208U
Application number: CN201921695092.4U
Authority: CN
Inventors: 郑滨; 贾川川; 于冰
Original assignee: Beijing Guoxin'an Information Technology Co ltd
Current assignee: Beijing Guoxin'an Information Technology Co ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-06-26
Anticipated expiration: 2029-10-11

Abstract

The utility model discloses a solar cell module for reducing electrical loss of a laminating part, which comprises a plurality of sliced cell pieces, wherein a space is arranged between the adjacent sliced cell pieces, the adjacent sliced cell pieces are respectively a P-type sliced cell piece and an N-type sliced cell piece, the front surfaces of the adjacent sliced cell pieces are connected through an upper conductor, and the back surfaces of the adjacent sliced cell pieces are connected through a lower conductor; the front side of the sliced cell is provided with a plurality of main grids, first fine grids and second fine grids, the first fine grids are parallel to the second fine grids, the first fine grids are perpendicular to the main grids, and the first fine grids are connected with the second fine grids through connecting grid lines; the distance between the adjacent first fine grids on the same sliced battery piece is the same, and the distance between the adjacent second fine grids is the same but smaller than the distance between the adjacent first fine grids; and the distance between the adjacent second fine grids on the second fine grid columns on the different sliced battery pieces is different. The utility model discloses reducible adjustment that technology, production line need be made because the difference of different regional thin bars quantity.

Description

Solar cell module capable of reducing electrical loss of laminating part

Technical Field

The utility model relates to a reduce solar module of lamination spare electricity loss.

Background

The development and utilization of solar clean energy become important projects for utilizing new energy in countries in the world, and how to improve the power generation efficiency of the solar cell is the key point of research and development work of various large photovoltaic enterprises; the power loss of the photovoltaic module mainly includes optical loss and electrical loss. Electrical losses include losses due to current matching, power losses from the junction box (primarily due to joule heating generated by the internal resistance of the junction box), and solder ribbon resistance losses (also joule heating). The front side of the cell is provided with a main grid and a fine grid, the main function of the main grid is similar to that of the fine grid, and the main grid collects carriers, but the number and the width of the main grid are optimized, so that the requirement that all effective carriers are collected sufficiently and coarsely is met, and the blocking effect on sunlight is reduced as much as possible as little as possible and as thin as possible is met; the design width of the existing thin grid line is constant, namely the resistance of the thin grid line is constant, and the larger the current collected by the thin grid line is or the larger the photo-generated current density is, the larger the electrical loss caused by the thin grid line is; at present, the thin grid lines between the main grids are in the same number and constant intervals, the closer to the main grids, the higher the current on the thin grids is, and the design requirements of efficiency gain brought by high light-generated current density and superfine grid line printing are met, and the design of the main grids and the thin grids must be changed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects in the prior art and providing a solar cell module for reducing the electrical loss of a laminating part, wherein the working current in a single cell string is one half of that of a conventional cell, thereby simplifying the connection mode between sliced cells, realizing the homonymy connection of adjacent sliced cells and reducing the electrical loss caused by resistance; the power loss generated when the current is conducted on the fine grid and the main grid is reduced, the main grid and the fine grid can be used for putting the battery pieces in the same area with the same number of the fine grids together by screen printing, and the adjustment of the process and the production line due to the different numbers of the fine grids in different areas is reduced.

In order to achieve the purpose, the technical scheme of the utility model is to design a solar cell module for reducing electrical loss of a laminating part, which comprises a glass layer, an EVA (ethylene vinyl acetate) packaging layer, a solar cell string layer and a back plate which are sequentially arranged from top to bottom, wherein the solar cell string layer comprises a plurality of sliced cells, a gap is arranged between every two adjacent sliced cells and is respectively a P-type sliced cell and an N-type sliced cell, the front sides of the adjacent sliced cells are connected through an upper conductor, the back sides of the adjacent sliced cells are connected through a lower conductor, the upper conductor and the lower conductor are arranged in a staggered manner, and the thickness of the lower conductor is larger than that of the upper conductor; the front side of the sliced battery piece is provided with a plurality of main grids, first fine grids and second fine grids, two adjacent rows of first fine grid rows and second fine grid rows are arranged between the adjacent main grids, the first fine grids are parallel to the second fine grids, the first fine grids are arranged perpendicular to the main grids and are connected through connecting grid lines, and the connecting grid lines are arranged parallel to the main grids; the distance between the adjacent first fine grids on the same sliced battery piece is the same, and the distance between the adjacent second fine grids is the same but smaller than the distance between the adjacent first fine grids; and the distance between the adjacent second fine grids on the second fine grid columns on the different sliced battery pieces is different. The solar cell slice is firstly cut into a plurality of slice cell slices by laser, and the working current in a single cell string is one half of that of a conventional cell slice by using the solar cell slice (the slice is a half cell slice); the P-type battery piece and the N-type battery piece are combined for use, so that the connection mode between the battery pieces is simplified, the connection of the adjacent battery pieces at the same side is realized, and the lower conductor with a larger sectional area is used for reducing the series resistance (namely, the thickness is thicker) of the assembly due to the fact that the lower conductor is connected at the back of the battery piece, so that the electrical loss caused by the resistance is further reduced; the power loss caused by the fine grids is reduced by combining the design of the number difference of the fine grids in different areas, the power loss generated when current is conducted on the fine grids and the main grids can be reduced by additionally arranging the second fine grid lines between the main grids and the fine grids, and the main grids and the fine grids can be used for putting the battery pieces in the areas with the same number of the fine grids together by screen printing, so that the adjustment of processes and production lines required by different numbers of the fine grids on different sliced battery pieces is reduced. The sliced battery pieces with the same second fine grid distance can be put together for batch production, the adjustment times of a process production line are reduced, and the working hours are reduced to the maximum extent.

The technical scheme is that a second thin grid array and a first thin grid array are sequentially arranged between adjacent main grids, two ends of each second thin grid are respectively connected with the main grids and the connecting grid lines, and two ends of each first thin grid are respectively connected with the connecting grid lines and the adjacent main grids close to the main grids. Just because the closer to the main grid, the larger the current on the fine grid, the arrangement can reduce the power loss generated when the current is conducted on the fine grid and the main grid, and reduce the electrical loss. In addition, to further expand the effect brought by this way, three columns, namely, a second fine gate column, a first fine gate column and a second fine gate column, may be sequentially arranged between adjacent main gates.

The further technical scheme is that a breakage-proof grid line parallel to the main grid is arranged between the second fine grids. The adjacent anti-breaking grid lines are not connected; in addition, the similar structure can be arranged between the adjacent first fine grids, the anti-breaking grid lines are arranged, and the adjacent anti-breaking grid lines are not connected. This avoids the el (electroluminescence) gate break problem.

The further technical proposal is that a welding strip is welded and fixed on the main grid; the width of the solder strip is 1.6mm, and the thickness of the solder strip is 0.2 mm. The thicker the welding strip is, the smaller the resistance of the welding strip is, and the lower the electrical loss is, and the experiment shows that the peak power is very large when the thickness of the welding strip is 0.2 mm.

The utility model has the advantages and the beneficial effects that: the solar cell slice (slicing into half cell slices) is used, so that the working current in a single cell string is one half of that of a conventional cell slice; the P-type battery piece and the N-type battery piece are combined for use, so that the connection mode between the battery pieces is simplified, the connection of the adjacent battery pieces at the same side is realized, and the lower conductor with a larger sectional area is used for reducing the series resistance (namely, the thickness is thicker) of the assembly due to the fact that the lower conductor is connected at the back of the battery piece, so that the electrical loss caused by the resistance is further reduced; the power loss caused by the fine grids is reduced by combining the design of the number difference of the fine grids in different areas, the power loss generated when current is conducted on the fine grids and the main grids can be reduced by additionally arranging the second fine grid lines between the main grids and the fine grids, and the main grids and the fine grids can be used for putting the battery pieces in the areas with the same number of the fine grids together by screen printing, so that the adjustment of processes and production lines required by different numbers of the fine grids on different sliced battery pieces is reduced. The sliced battery pieces with the same second fine grid distance can be put together for batch production, the adjustment times of a process production line are reduced, and the working hours are reduced to the maximum extent. The thicker the welding strip is, the smaller the resistance of the welding strip is, and the lower the electrical loss is, and the experiment shows that the peak power is very large when the thickness of the welding strip is 0.2 mm.

Drawings

Fig. 1 is a schematic view of a layer structure of a first embodiment of a solar cell module for reducing electrical loss of a laminate according to the present invention;

FIG. 2 is an enlarged schematic view of the solar cell string layer of FIG. 1;

FIG. 3 is a top view of a conductor from the block of FIG. 2;

fig. 4 is a top view of a certain upper conductor in the second embodiment of the present invention.

In the figure: 1. slicing the battery pieces; 2. an upper conductor; 3. a lower conductor; 4. a main grid; 5. a first fine gate; 6. a second fine gate; 7. connecting the grid lines; 8. preventing the grid line from being broken; 9. welding a strip; 10. a glass layer; 11. an EVA packaging layer; 12. a solar cell string layer; 13. a back plate.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows:

as shown in fig. 1 to 3, the utility model relates to a solar cell module for reducing electrical loss of laminated parts, which comprises a glass layer 10, an EVA encapsulating layer 11, a solar cell string layer 12 and a back plate 13, which are sequentially arranged from top to bottom, wherein the solar cell string layer 12 comprises a plurality of sliced cells 1, a space is arranged between adjacent sliced cells 1 and is respectively a P-type sliced cell 1 and an N-type sliced cell 1, the front sides of adjacent sliced cells 1 are connected through an upper conductor 2 and the back sides of adjacent sliced cells are connected through a lower conductor 3, the upper conductor 2 and the lower conductor 3 are arranged in a staggered manner, and the thickness of the lower conductor 3 is larger than that of the upper conductor 2; the front surface (namely the upper surface of an upper conductor) of the sliced battery piece 1 is provided with a plurality of main grids 4, first fine grids 5 and second fine grids 6, two adjacent rows of the first fine grids 5 and the second fine grids 6 are arranged between the adjacent main grids 4, the first fine grids 5 are parallel to the second fine grids 6, the first fine grids 5 are perpendicular to the main grids 4, the first fine grids 5 are connected with the second fine grids 6 through connecting grid lines 7, and the connecting grid lines 7 are parallel to the main grids 4; the distance between the adjacent first fine grids 5 on the same sliced battery piece 1 is the same, and the distance between the adjacent second fine grids 6 is the same but smaller than the distance between the adjacent first fine grids 5; the distance between the adjacent second fine grids 6 on the second fine grid 6 columns on different sliced battery pieces 1 is different. Second thin grid 6 rows and first thin grid 5 rows are sequentially arranged between adjacent main grids 4, two ends of each second thin grid 6 are respectively connected with the main grids 4 and the connecting grid lines 7, and two ends of each first thin grid 5 are respectively connected with the connecting grid lines 7 and the adjacent main grids 4 close to the main grids 4. And an anti-breaking grid line 8 parallel to the main grid 4 is arranged between the second fine grids 6. A welding strip 9 is welded and fixed on the main grid 4; the width of the solder strip 9 is 1.6mm, and the thickness of the solder strip 9 is 0.2 mm. And a breakage-proof grid line 8 is also arranged between the adjacent first fine grids 5, and the adjacent breakage-proof grid lines are not connected.

Example two:

the difference from the first embodiment is that three columns, namely, a second fine gate 6 column, a first fine gate 5 column and a second fine gate 6 column, are sequentially arranged between adjacent main gates as shown in fig. 4, and two connecting gate lines 7 are arranged between adjacent main gates 4.

The method comprises the steps of carrying out packaging comparison tests on six groups of 72 serially connected single crystal solar cells with the specification of 125 × 125mm, wherein the widths of welding strips of all groups are the same and are 1.6mm, the thicknesses of the welding strips are 0.14mm, 0.16mm, 0.18mm, 0.20mm, 0.22mm and 0.24mm respectively, and after the tests, the peak power of the single crystal solar cell module of the welding strip with the thickness of 0.20mm is not greatly different from the peak power values (193.9 +/-0.2W) of the single crystal solar cell module of the welding strips with the thicknesses of 0.22mm and 0.24mm, and is larger than the peak power of the single crystal solar cell module of other thin welding strips.

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

Claims

1. A solar cell module capable of reducing electrical loss of a laminating part is characterized by comprising a glass layer, an EVA (ethylene vinyl acetate) packaging layer, a solar cell string layer and a back plate which are sequentially arranged from top to bottom, wherein the solar cell string layer comprises a plurality of sliced cells, a distance is arranged between every two adjacent sliced cells and is respectively a P-type sliced cell and an N-type sliced cell, the front sides of the adjacent sliced cells are connected through an upper conductor, the back sides of the adjacent sliced cells are connected through a lower conductor, the upper conductor and the lower conductor are arranged in a staggered mode, and the thickness of the lower conductor is larger than that of the upper conductor; the front side of the sliced battery piece is provided with a plurality of main grids, first fine grids and second fine grids, two adjacent rows of first fine grid rows and second fine grid rows are arranged between the adjacent main grids, the first fine grids are parallel to the second fine grids, the first fine grids are arranged perpendicular to the main grids and are connected through connecting grid lines, and the connecting grid lines are arranged parallel to the main grids; the distance between the adjacent first fine grids on the same sliced battery piece is the same, and the distance between the adjacent second fine grids is the same but smaller than the distance between the adjacent first fine grids; and the distance between the adjacent second fine grids on the second fine grid columns on the different sliced battery pieces is different.

2. The solar cell module with reduced electrical loss of laminate as claimed in claim 1, wherein the second fine grid rows and the first fine grid rows are sequentially arranged between adjacent main grids, two ends of each second fine grid are respectively connected with the main grids and the connecting grid lines, and two ends of each first fine grid are respectively connected with the connecting grid lines and the adjacent main grids close to the main grids.

3. The solar cell module with reduced electrical loss of laminate of claim 2, wherein the second fine grid has a break-proof grid line between them parallel to the main grid.

4. The solar cell module with reduced electrical loss of laminate of claim 3 wherein said main grid is solder bonded with solder strips; the width of the solder strip is 1.6mm, and the thickness of the solder strip is 0.2 mm.