CN204516783U - Solar cell - Google Patents

Abstract

The utility model provides a solar cell, which comprises a battery sheet and an electrode grid line arranged on the battery sheet. The electrode grid line includes an auxiliary grid line connected to the battery sheet and a main grid line connected to the auxiliary grid line. Alternately arranged grooves are formed on the side. The technical solution of the utility model can effectively solve the problem of the consumption of silver paste in the solar cell in the prior art caused by too wide wide busbar lines.

Description

Solar battery

technical field

The utility model relates to the field of photovoltaic technology, in particular to a solar cell.

Background technique

In the field of photovoltaic solar energy technology, how to improve the conversion efficiency of cells and reduce manufacturing costs is a technical problem that the photovoltaic manufacturing industry needs to solve. The most closely related to the battery conversion efficiency and manufacturing cost is the design of the battery grid pattern structure. A reasonable design of the battery grid pattern structure can reduce the resistance of the battery sheet and prepare high-efficiency solar cells.

Fig. 1 shows the structure of a current conventional solar cell, which includes a battery sheet and electrode grid lines arranged on the battery sheet. The electrode grid line is mainly composed of three main grid lines 20' and several auxiliary grid lines 10'. The current generated by the silicon chip is collected by the auxiliary grid lines 10' and collected on the main grid line 20', and finally led out by the welding strip. The busbars 20' in the prior art are usually elongated gridlines of equal width to collect current. Since the busbars 20' are very wide, a large amount of silver paste will be consumed during the manufacture of solar cells, which will increase the cost. During the use of the solar cell, the wide busbar 20' will also affect the lighting of the solar cell.

Utility model content

The main purpose of the utility model is to provide a solar cell to solve the problem of silver paste consumption in the solar cell in the prior art due to too wide wide busbar lines.

In order to achieve the above object, the utility model provides a solar cell, which includes a battery sheet and an electrode grid line arranged on the battery sheet. The electrode grid line includes an auxiliary grid line connected to the battery sheet and a main grid line connected to the auxiliary grid line. Alternately arranged grooves are formed on the long sides of the busbars.

Further, the main grid line includes a first long side and a second long side, and the groove includes a first groove and a second groove, and alternately arranged first grooves are formed along the first long side of the main grid line. Alternately arranged second grooves are formed on the second long side of the busbar.

Further, the first groove and the second groove have the same shape.

Further, the first groove and the second groove correspond to each other on the busbar.

Further, the solar cell includes 4 busbars.

Further, the solar cell includes at least 5 busbars.

With the technical solution of the utility model, since the grooves arranged alternately are formed on the long side of the busbar, printing silver paste equal to the volume of the groove can be saved when printing the busbar on the battery sheet, and the cost is saved. At the same time, when the solar cell is in use, the design of the groove can also avoid the shielding of the light by the busbar, so that the cell can receive more sunlight for power generation, and enhance the luminous efficiency of the solar cell.

In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. Below with reference to figure, the utility model is described in further detail.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 shows a schematic structural view of a solar cell in the prior art;

Fig. 2 shows a schematic structural view of an embodiment of a solar cell according to the present invention;

FIG. 3 shows an enlarged schematic view of the busbar structure of the solar cell in FIG. 2 .

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10', auxiliary grid line; 20', main grid line; 10, auxiliary grid line; 20, main grid line.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

FIG. 2 shows the solar cell of this embodiment, which includes a battery sheet and electrode grid lines arranged on the battery sheet. The electrode grid lines include sub-grid lines 10 connected to the cells and main grid lines 20 connected to the sub-grid lines 10 , and alternately arranged grooves are formed along the long sides of the main grid lines 20 . The alternate arrangement here refers to the alternate arrangement between grooves and non-grooves.

Since the grooves arranged alternately are formed on the long sides of the busbars 20 , when the busbars 20 are printed on the battery sheet, printing silver paste with the same volume as the grooves can be saved, thereby saving costs. At the same time, when the solar cell is in use, the design of the groove can also avoid the shielding of light by the busbar 20, so that the cell can receive more sunlight for power generation, and enhance the luminous efficiency of the solar cell.

In this embodiment, the main grid line 20 includes a first long side and a second long side, the groove includes a first groove and a second groove, and alternately arranged second grooves are formed along the first long side of the main grid line 20 . A groove, alternately arranged second grooves are formed along the second long side of the busbar 20 . In this way, more printing silver paste can be saved, and the influence of the busbar 20 on sunlight can be reduced as much as possible.

As shown in Fig. 3, in this embodiment, the first groove and the second groove have the same shape. This design is more convenient for printing. Preferably, in this embodiment, the first grooves and the second grooves correspond to each other on the busbar 20 , and the busbars 20 form a gourd structure in series. Such a shape of the busbar 20 is more convenient for printing.

In the prior art, the arrangement of three busbar lines is adopted, so that the distance between each busbar line is relatively large, and the length of the auxiliary gate lines between each main barline is also relatively long. Since the line width of the auxiliary grid line is much smaller than that of the main grid line, the resistance of the auxiliary grid line will be greater than that of the main grid line. The current generated by the battery sheet will first pass through the longer length of the auxiliary grid line before being transmitted to the main grid line. Then, the resistance consumes a lot of power. On the other hand, there is a certain probability that the auxiliary grid lines will be broken, and the distribution of the existing main grid lines is relatively sparse. If the cells connected by the broken auxiliary grid lines are not collected by the main grid lines, it will cause Some cells failed.

However, in the technical solution of this embodiment, the solar cell includes four main grid lines 20. The arrangement of four main grid lines 20 shortens the distance between each main grid line 20 and the sub-grid between each main grid line 20. The length of the line 10. The current generated by the cell can reach the main grid line 20 only through the short auxiliary grid line 10 , which reduces the current consumption on the auxiliary grid line 10 and effectively improves the efficiency of the solar cell. In addition, in this embodiment, the number of main grid lines 20 is changed from 3 in the prior art to 4, so that the distribution of the main grid lines 20 is denser than that of the prior art. At the same time, the main grid line 20 is also more likely to connect the battery slices connected to the broken sub-grid line 10, which can reduce the probability of black spots and shadows in the solar cell.

It should be noted that the structure of the elongated busbar in the prior art is:

Length: 153mm;

Width: 1mm;

Number of busbar lines: 3;

Then the area of the existing busbar is: 153*1*3=459 square millimeters.

The structure of the gourd-type busbar 20 in this embodiment is:

Length: 153mm;

Width: 1mm;

Corresponding width of non-groove: 1mm;

Corresponding length of non-groove: 9mm;

Number of corresponding non-groove locations in one busbar line: 6;

Corresponding width at the groove: 0.40mm;

Corresponding length at the groove: 9.7mm;

The number of corresponding grooves in one busbar line: 7;

The length of both ends of the main grid line: 15.55mm;

Width at both ends of the busbar: 1mm;

Then the area of the gourd-type busbar 20 in this embodiment is: (9*1*6+15.55*1*2+9.7*0.4*7)*4=449.04 square millimeters.

It can be seen that even if the technical solution of this embodiment adopts the arrangement of four busbar lines 20 , it saves silver paste compared with the arrangement of three busbar lines in the prior art. At the same time, since the technical solution of this embodiment adopts the setting of four main grid lines 20, the technical solution of this embodiment reduces the current consumption on the auxiliary grid lines 10, and reduces the black spots and shadows that appear on the solar cell. chance, effectively improving the efficiency of solar cells. The technical solution of this embodiment is greatly superior to the solar cells in the prior art.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (6)

1. a solar cell, comprise cell piece and be arranged on the gate electrode line on described cell piece, described gate electrode line comprises the secondary grid line (10) connecting described cell piece and the main gate line (20) connecting described secondary grid line (10), it is characterized in that, be formed with along on the long limit of described main gate line (20) groove be alternately arranged.

2. solar cell according to claim 1, it is characterized in that, described main gate line (20) comprises the first long limit and the second long limit, described groove comprises the first groove and the second groove, described first long limit along described main gate line (20) is formed with described first groove be alternately arranged, and the described second long limit along described main gate line (20) is formed with described second groove be alternately arranged.

3. solar cell according to claim 2, is characterized in that, described first groove is identical with described second groove shapes.

4. solar cell according to claim 3, is characterized in that, upper described first groove of described main gate line (20) and described second groove corresponding between two.

5. solar cell according to claim 4, is characterized in that, described solar cell comprises 4 described main gate line (20).

6. solar cell according to claim 4, is characterized in that, described solar cell comprises at least 5 described main gate line (20).