CN210325818U - Multi-main-grid solar cell and cell front electrode structure - Google Patents
Multi-main-grid solar cell and cell front electrode structure Download PDFInfo
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- CN210325818U CN210325818U CN201921207197.0U CN201921207197U CN210325818U CN 210325818 U CN210325818 U CN 210325818U CN 201921207197 U CN201921207197 U CN 201921207197U CN 210325818 U CN210325818 U CN 210325818U
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Abstract
The utility model discloses a many main grids solar cell and positive electrode structure of battery. The front electrode structure of the multi-main-gate battery comprises a leading-out electrode, a current collecting electrode and a current leading-out electrode, wherein the current collecting electrode comprises a plurality of auxiliary grid lines which are uniformly distributed along the transverse direction, the current leading-out electrode comprises a plurality of main grid lines which are uniformly distributed along the longitudinal direction, the main grid lines are mutually vertical to the auxiliary grid lines, each main grid line is connected with all the auxiliary grid lines, and the plurality of auxiliary grid lines between every two adjacent main grid lines are arranged at intervals of a solid line segment and a broken line segment in the middle; the lead-out electrode is arranged at the intersection of the main grid line and the auxiliary grid line, and a welding spot is arranged at the intersection provided with the lead-out electrode. The utility model discloses reduce the use amount of silver thick liquid, under keeping the unchangeable condition of shading loss, reduced series resistance, improved conversion efficiency.
Description
Technical Field
The utility model relates to a many main grids solar cell and positive electrode structure of battery belongs to solar cell technical field.
Background
In the manufacturing process of the solar cell, in order to collect and guide out the current generated by the solar cell, an electrode needs to be prepared on the surface of the solar cell, the solar front electrode consists of a main grid and an auxiliary grid line, the auxiliary grid line collects the current in the solar cell, and the main grid line collects the current on the auxiliary grid line and conducts the current out through a welding strip. The high efficiency and low cost are the development trend of solar cell technology, the solar photovoltaic power generation electricity cost is continuously reduced, and the realization of the flat price internet surfing is the final goal of the development of the photovoltaic industry. The method for greatly improving the photoelectric conversion efficiency of the solar cell is the most effective way for reducing the photovoltaic power consumption cost.
The mainstream solar cell products in the current market are concentrated on 4-5 main grids, the main grids are generally in a solid rectangular structure with the thickness of about 1.2mm, and the structure not only influences the shading area, but also wastes silver paste. In order to achieve the win-win effect and cost, the number of the main grids of the solar cell becomes a key point of research, the multi-main grid solar technology gradually becomes a direction for improving the efficiency, and solar cell manufacturers improve the number of the main grids from 3 to 4, even 15 from the aspect of improving the efficiency.
With the continuous development of new technologies, a great deal of research in the industry at present shows that the efficiency of the solar cell gradually rises with the increase of the number of the main grids, and the multi-main-grid solar technology is popular in the industry due to the fact that the multi-main-grid solar technology realizes effective combination of high efficiency and low cost. The multi-main-grid technology increases the number of main grids, reduces the current transmission distance of the fine grid and enables the resistance loss on the fine grid to be smaller. Although the wider main grid lines ensure that the welding strip of the front electrode and the battery can be well welded, the shading area of the main grid lines is larger in the process, the effective light receiving area of the battery is reduced, the number of the main grid lines is increased by the multi-main-grid technology, the current transmission distance of the fine grid is reduced, the resistance loss on the fine grid is smaller, the number of the main grid lines is increased, the width of the main grid is further reduced under the condition that the shading is not changed, the difficulty of subsequent welding is further increased due to the reduction of the width of the main grid, in order to ensure a good welding effect, welding spots are increased on the main grid lines by manufacturers so as to facilitate the good welding effect, the welding spots are mostly rectangular welding spots with agreed sizes at present, and the area of the welding spots is large; but a special multi-main-grid series welding machine is adopted to weld in the multi-main-grid (not less than 10 main grids) welding process, when series welding is carried out, firstly, the welding strip soaked with the soldering flux is cut into the length suitable for welding, the welding strip is placed on a heating platform, then the battery piece is placed, then the front welding strip is placed, the welding strips are aligned with the main grids through the adjustment of related mechanisms, the welding strips of the battery pieces are uniformly placed in an infrared region for heating after being placed, the welding strips of the prior multi-main grid are limited by the welding strip process and mostly adopt circular welding strips coated with tin and copper, the structure of the welding strips can increase the incidence of light, however, the circular-structure solder strip is easier to roll and displace in the high-temperature welding process of infrared welding due to high-temperature deformation, so that the aligned solder strip and the main grid deviate to cause partial welding and virtual welding, and the displacement and the rolling of the deformation of the high-temperature area of the solder strip are the main reasons for the low yield of the conventional multi-main-grid product.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the conversion efficiency that traditional solar cell leads to because of the main grid line structure is not good is low, the welded reliability is poor, and the battery openly welds partially and rosin joint easily appears, and solder joint department silver thick liquid use amount scheduling problem greatly.
In order to solve the problem, the utility model provides a many main grid battery positive electrode structure which is characterized in that, including derivation electrode and current collection electrode, current derivation electrode, current collection electrode contains along many vice grid lines of horizontal evenly distributed, current derivation electrode includes along many main grid lines of vertical evenly distributed, main grid line and vice grid line mutually perpendicular, every main grid line all is connected with all vice grid lines, many vice grid lines between two adjacent main grid lines are the dotted line section interval arrangement of solid line section and middle disconnection; the lead-out electrode is arranged at the intersection of the main grid line and the auxiliary grid line, and a welding spot is arranged at the intersection provided with the lead-out electrode.
The increase of main grid line quantity has reduced the transmission distance of the electric current of vice grid line to main grid line, makes the resistance loss on the vice grid line littleer, and every interval of vice grid line has the disconnection simultaneously, not only does not influence the derivation of this department electric current at an interval, but also has increased the incident area of light, has reduced the use amount of silver thick liquid.
Preferably, the number of the main grid lines is not less than 10, and the number of the welding spots on each main grid line is not less than 7 and is odd.
More preferably, the area of the welding spot at the middle position and at the two ends of each main grid line is larger than that of other welding spots by more than 10%. Because the area is big, silver thick liquid also can correspondingly increase, and at high temperature welding region, the calendering time of the great solder joint of area is short, can combine with the solder strip earlier than other solder joints, and head and the tail and intermediate point can fix the solder strip position earlier, have avoided when follow-up all the other less solder joints still do not weld with the solder strip, and the solder strip has produced roll and displacement because of high temperature deformation, has guaranteed the welded precision.
Preferably, the center positions of all the welding points coincide with the intersection points of the main grid lines/the auxiliary grid lines.
Preferably, the shape of the welding spot is a diamond shape. Compared with a rectangular structure, the diamond-shaped structure has the advantages that the length and width of the rectangle are changed into the length of the diagonal line of the diamond, the contactable width of the solder strip is also guaranteed, the area of the diamond is only half of that of the rectangle, the usage amount of silver paste at a solder joint can be reduced by half, and the contact area of one time of light is increased.
Preferably, the number of the secondary grid lines is not less than 100, and the width of each secondary grid line is less than 40 μm.
Preferably, the disconnected part in the middle of the auxiliary grid line is located in the middle of two adjacent main grid lines, and the disconnection distance is 2-3 mm.
Preferably, the spacing distance of the main grid lines is larger than that of the auxiliary grid lines.
The utility model also provides a solar cell, its characterized in that, battery front electrode structure is above-mentioned many main grid battery front electrode structure.
Compared with the traditional 4-grid battery, the utility model reduces the usage amount of silver paste, reduces the series resistance under the condition of keeping the shading loss unchanged, and improves the conversion efficiency; compared with the prior multi-main-grid technology, the area of the first welding point, the tail welding point and the middle welding point on the main grid line is increased by changing the size of the welding point on the main grid line, so that the main grid and the welding strip are positioned first in the first region, the tail region and the middle region, the main grid line is ensured to be accurately contacted with the welding strip when the welding strip is welded, the accurate welding can be realized, the welding strip is not deformed and deviated due to high temperature during high-temperature welding, and a good and remarkable welding effect is obtained; meanwhile, the pattern of the welding spot is optimized on the premise of not influencing the welding effect, the conventional rectangular welding spot is changed into the rhombic welding spot, the area of the welding spot is obviously reduced, but the contact between the welding spot and the welding strip is not influenced, the area of the front electrode is further reduced, and the using amount of silver paste is reduced.
Drawings
Fig. 1 is a schematic diagram of a front electrode structure of a multi-main gate battery provided by the present invention;
fig. 2 is a partial schematic view of fig. 1.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 2, for the utility model provides a many main grid battery positive electrode structure, it includes derived electrode and current collection electrode, current derived electrode, current collection electrode contains along many vice grid lines 1 of horizontal evenly distributed, current derived electrode includes along 15 main grid lines 2 of vertical evenly distributed, main grid line 2 and vice grid line 1 mutually perpendicular, every main grid line 2 all is connected with all vice grid lines 1, many vice grid lines 1 between two adjacent main grid lines 2 are the dotted line segment interval arrangement of solid line segment and middle disconnection; the lead-out electrode is arranged at the intersection of the main grid line 2 and the auxiliary grid line 1, and a welding spot 3 is arranged at the intersection provided with the lead-out electrode. The cross section of the current lead-out electrode is rectangular.
The width of the bus bar line 2 is 0.1 mm. The number of the welding spots 3 on each main grid line 2 is 15. The 1 st, 8 th and 15 th welding spots 3 on each main grid line 2 are rhombuses with the diagonal line of 0.6mm multiplied by 0.6mm, and the other welding spots 3 are rhombuses with the diagonal line of 0.5mm multiplied by 0.6 mm. The intersection of the diagonals coincides with the intersection of the main grid line 2/the sub grid line 1.
The width of the finger 1 is 25 μm. The number of the sub-gate lines 1 is 121. The disconnected part in the middle of the auxiliary grid line 1 is positioned in the middle of two adjacent main grid lines 2, and the disconnection distance is 2 mm. The spacing distance of the main grid lines 2 is larger than that of the auxiliary grid lines 1. The lengths of the main grid line and the auxiliary grid line are both 155.5 mm.
The front electrode structure of the multi-main-grid battery is made into a solar cell sheet with the thickness of 157.4mm multiplied by 157.4 mm. Comparing the shading area of the solar cell with that of a solar cell with a conventional four-main-grid cell front electrode structure:
the width of main grid lines of a conventional four-main-grid battery front electrode structure is 1.2mm, the number of auxiliary grid lines is 95, the width of the auxiliary grid lines is 0.04mm, and the lengths of the main grid lines and the auxiliary grid lines are 155.5 mm. The light-shielding area is 1.2mm × 155.5mm × 4+0.04mm × 155.5mm × 95 ═ 746.4+590.9 (mm)2)＝1337.3mm2。
The solar cell of the present example had a light-shielding area of 0.6mm × 0.6mm × 3 × 15 ÷ 2+0.6mm × 0.5mm × 12 × 15 ÷ 2+0.025mm × 155.5mm × 121-0.025mm × 14 × 60+0.1mm × 15 × 155.5mm ═ 16.2+54+470.38-21+233.25(mm × 15 × 15.5 mm ÷ 16.2+54+470.38-21+233.25 (mm)2)＝752.83mm2。
As can be seen, the light-shielding area of the front electrode structure of the multi-main-grid cell adopted in the embodiment is significantly smaller than that of the solar cell with the conventional front electrode structure of the four-main-grid cell. Meanwhile, the head and the tail of each row of main grids and the middle welding points are properly enlarged, the larger welding points are provided with more silver paste in the subsequent welding process, and under the condition that the welding temperature is consistent, the head and the tail of the welding strip are firstly fixed, so that the middle department is arranged, the phenomenon that the welding strip is deformed due to rolling in the subsequent process is avoided, and the yield of series welding of the battery is improved.
The weld spot area of the diamond weld spot in this example was compared to the weld spot area of the rectangular weld spot that achieved the same weld spot effect (i.e., the two diagonals of the diamond weld spot were the same as the rectangular length/width specification):
the welding spot area of the rectangular welding spot is as follows: 0.6mm × 0.6mm × 3 × 15+0.6mm × 0.5mm × 12 × 15 ═ 54+16.2 (mm)2)＝70.2mm2。
The welding spot area of the diamond welding spot is as follows: 0.6 mm. times.0.6 mm. times.3X 15X 0.5+0.6 mm. times.0.5 mm. times.12X 15X 0.5mm 35.1mm2。
It can be seen that the welding spot area of the diamond welding spot adopted by the embodiment is 50% smaller than that of the rectangular welding spot.
Claims (9)
1. The front electrode structure of the multi-main-gate battery is characterized by comprising a lead-out electrode, a current collecting electrode and a current lead-out electrode, wherein the current collecting electrode comprises a plurality of auxiliary grid lines (1) which are uniformly distributed along the transverse direction, the current lead-out electrode comprises a plurality of main grid lines (2) which are uniformly distributed along the longitudinal direction, the main grid lines (2) are perpendicular to the auxiliary grid lines (1), each main grid line (2) is connected with all the auxiliary grid lines (1), and the plurality of auxiliary grid lines (1) between every two adjacent main grid lines (2) are arranged at intervals of solid line segments and broken line segments in the middle; the lead-out electrode is arranged at the intersection of the main grid line (2) and the auxiliary grid line (1), and a welding spot (3) is arranged at the intersection of the lead-out electrode.
2. The front electrode structure of a multi-main-gate battery as claimed in claim 1, wherein the number of the main gate lines (2) is not less than 10, and the number of the pads (3) on each main gate line (2) is an odd number not less than 7.
3. The front electrode structure of a multi-main-gate battery as claimed in claim 2, wherein the area of the pad (3) at the middle of each main gate line (2) is more than 10% larger than the area of the other pads (3).
4. The front electrode structure of a multi-main-gate battery as claimed in claim 1, wherein the center position of all the pads (3) coincides with the main gate line (2)/sub-gate line (1) intersection.
5. A multi-main-gate battery front electrode structure as claimed in any one of claims 1-4, wherein the shape of said solder joint (3) is a diamond shape.
6. The front electrode structure of a multi-main-gate battery as claimed in claim 1, wherein the number of the minor gate lines (1) is not less than 100, and the width of each minor gate line (1) is less than 40 μm.
7. The front electrode structure of a multi-main-gate battery as claimed in claim 1, wherein the broken part in the middle of the sub-gate line (1) is located in the middle of two adjacent main gate lines (2), and the breaking distance is 2-3 mm.
8. The front electrode structure of a multi-main-gate battery as claimed in claim 1, wherein the main gate lines (2) are distributed with a larger spacing distance than the sub-gate lines (1).
9. A solar cell, characterized in that the cell front electrode structure is a multi-main-grid cell front electrode structure according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921207197.0U CN210325818U (en) | 2019-07-29 | 2019-07-29 | Multi-main-grid solar cell and cell front electrode structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921207197.0U CN210325818U (en) | 2019-07-29 | 2019-07-29 | Multi-main-grid solar cell and cell front electrode structure |
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| CN210325818U true CN210325818U (en) | 2020-04-14 |
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| CN201921207197.0U Active CN210325818U (en) | 2019-07-29 | 2019-07-29 | Multi-main-grid solar cell and cell front electrode structure |
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