CN204332975U - A kind of multi-grid cell and solar cell assembly - Google Patents

Abstract

The utility model relates to a kind of multiple-grid line cell piece and solar module.The sensitive surface of this multiple-grid line cell piece is provided with many secondary grid lines and n root main gate line, secondary grid line and the interlaced arrangement of main gate line, the end that two of described sensitive surface are relative is provided with a main gate line Rendezvous Point separately, one end of described main gate line comes together in the main gate line Rendezvous Point of described sensitive surface one end, the other end of described main gate line comes together in the main gate line Rendezvous Point of the described sensitive surface other end, and n root main gate line is symmetrical arranged along the line of two main gate line Rendezvous Points, wherein, n root or n-1 root main gate line occur at middle part to bend at least one times, and n >=4.This solar module comprises several solar battery sheets in series or in parallel with each other, and wherein, described solar battery sheet is above-mentioned multiple-grid line cell piece.The described multiple-grid line cell piece that the utility model provides can obtain higher electricity conversion.

Description

A kind of multi-grid cell and solar cell module

technical field

The utility model relates to the battery field, in particular to a multi-grid battery sheet and a solar battery assembly.

Background technique

Due to the gradual depletion of fossil energy sources, new energy sources such as solar energy and wind energy are gradually emerging. As a device that directly converts solar energy into electrical energy, solar power generation devices have the advantages of various installation forms, safety and pollution-free, inexhaustible, and inexhaustible, so they have been vigorously developed.

In solar power generation devices, solar cells are one of the core components. In order to meet the more demanding demands of the photovoltaic market, improving the conversion efficiency and/or reducing the production cost of solar cells has attracted more and more attention.

As shown in FIG. 1 , a traditional solar cell is provided with multiple auxiliary grid lines 2 parallel to each other and three main grid lines 1 parallel to each other on the light-receiving surface of the solar cell. For this traditional cell, on the one hand, the main grid line 1 and the sub-grid line 2 are relatively scattered, and the distance from the electrons generated on the sub-grid line to the main grid line is relatively long, which makes the photoelectric conversion efficiency of the cell sheet low; On the one hand, the diameter of the busbar 1 is relatively large, usually 1.4-1.6mm, so the shading area of the busbar is relatively large, so that the effective area on the battery sheet is small, and the material used to form the busbar, such as silver paste The dosage is relatively large.

Utility model content

The purpose of this utility model is to provide a new multi-grid cell and solar cell assembly to overcome the long distance from the electrons on the sub-grid to the main grid in the existing battery, which leads to relatively low photoelectric conversion efficiency. low defect.

The utility model provides a multi-grid battery sheet, wherein, the light-receiving surface of the multi-grid battery sheet is provided with a plurality of auxiliary grid lines and n main grid lines, and the auxiliary grid lines and the main grid lines are arranged alternately , the two opposite ends of the light-receiving surface are each provided with a busbar converging point, one end of the busbar converges at the busbar converging point at one end of the light-receiving surface, and the other of the busbar One end converges at the busbar converging point at the other end of the light-receiving surface, and n busbar lines are arranged symmetrically along the line connecting the two busbar converging points, wherein n or n-1 busbar lines are At least one bending occurs in the middle part, and n≥4, preferably 6-20.

Preferably, each of the main grid lines is located on one side of a connection line connecting the two main grid lines or on the connection line.

Preferably, the plurality of sub-gate lines are arranged in parallel with each other.

Further preferably, n or n-1 main grid lines are bent once in the middle, and each formed bending point is located on the same auxiliary grid line.

Further preferably, each bending point is a midpoint of a corresponding busbar.

Further preferably, the line connecting the converging points of the main grid lines at the two ends and the auxiliary grid lines are perpendicular to each other.

Further preferably, on the sub-grid line where the bending point is located, among the contact points between each main grid line and the sub-grid line, the distance between any two adjacent contact points is equal.

Preferably, n is an odd number, there is one busbar line that is not bent, and the busbar line that is not bent overlaps with a line connecting two busbar line convergence points.

Preferably, n is an even number, and all busbar lines are bent.

Preferably, the diameter of the busbars is 50-300 microns.

The utility model also provides a solar cell assembly, which includes several solar cells connected in series or in parallel, wherein the solar cells are the above-mentioned multi-grid cells provided by the utility model.

According to the multi-grid battery sheet provided by the utility model, by increasing the number of main grid lines and setting the main grid lines on the light-receiving surface of the battery sheet in a specific structure, it can ensure that the current generated by the battery sheet passes through the The auxiliary grid lines converge to the nearby main grid lines, thereby shortening the distance between electrons and the main grid lines, reducing the loss of electrons, and improving the photoelectric conversion efficiency of the cell.

In addition, compared with the traditional solar cells, the diameter of the busbars on the multi-grid cells of the utility model can be greatly reduced, thereby reducing the shading area of the busbars and increasing the effective area, thereby improving the photoelectric conversion efficiency of the cell.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

FIG. 1 is a schematic structural view of an existing battery sheet;

Fig. 2 is a schematic structural view of the battery sheet provided by the present invention.

Explanation of reference signs

1 main grid line 2 auxiliary grid line

Detailed ways

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

As shown in Figure 2, in the multi-grid battery sheet provided by the utility model, a plurality of auxiliary grid lines 2 and n main grid lines 1 are arranged on the light-receiving surface of the battery sheet, and the auxiliary grid lines 2 and the main grid lines Lines 1 are arranged alternately, two opposite ends of the light-receiving surface are respectively provided with a busbar convergence point, and one end of the busbar converges at the busbar convergence point at one end of the light-receiving surface, so The other end of the busbars is collected at the busbar converging point at the other end of the light receiving surface, and n busbars are arranged symmetrically along the line connecting the two busbar converging points, wherein n or n- One busbar is bent at least once in the middle, and n≥4, preferably 6-20.

In the present invention, the middle part of the busbar does not refer to the midpoint of the busbar, but refers to the position between the two ends of the busbar.

In the multi-grid battery sheet, each of the busbars is located on one side of the line connecting the two busbar lines or on the line.

In the multi-grid battery sheet, a plurality of auxiliary grid lines 2 may be arranged in parallel to each other, or may be arranged in an irregular shape, such as arranged in a spider web.

In the multi-grid battery sheet, the n or n-1 busbars may be bent once in the middle, or may be bent multiple times, for example, twice. Preferably, n or n-1 busbar lines are bent once in the middle. Further preferably, the formed bending points are located on the same sub-grid line.

According to a preferred embodiment of the present invention, as shown in Figure 2, in the multi-grid battery sheet, two opposite ends of the light-receiving surface are respectively provided with a main grid line converging point, and a plurality of auxiliary grid lines 2 are arranged in parallel with each other, n or n-1 main grid lines are bent once in the middle, and each formed bending point is located on the same auxiliary grid line. In this preferred embodiment, the main grid line forms an umbrella-shaped structure on both sides of the sub-grid line where each bending point is located.

In the multi-grid battery sheet, when n or n-1 busbars are bent once in the middle, preferably, each bending point is the midpoint of the corresponding busbar. Further preferably, two opposite ends of the light-receiving surface are each provided with a main grid line converging point, and a line connecting the main grid line converging points at the two ends is perpendicular to the auxiliary grid lines. In this case, the main grid line forms mutually symmetrical mushroom structures on both sides of the sub grid line where each bending point is located.

In the multi-grid battery sheet, when two opposite ends of the light-receiving surface are respectively provided with a main grid line converging point, a plurality of sub-grid lines 2 are arranged in parallel with each other, and n or n-1 main grid lines When a bend occurs in the middle, and each formed bending point is located on the same auxiliary grid line, on the auxiliary grid line where the bending point is located, at the contact point between each main grid line and the auxiliary grid line In , the distance between any two adjacent contact points is equal, and the equality here is only equal under the ideal state. In actual use, due to the influence of process differences, environmental differences, and measurement tool differences, it may cause certain Errors, therefore, equality here, can allow for errors to some extent. In this case, the busbars are evenly distributed on the light-receiving surface of the battery sheet, which is more conducive to improving the photoelectric conversion efficiency of the battery sheet.

In the multi-grid battery sheet, when the number n of the main grid lines is an odd number, preferably, there is one main grid line that is not bent, and the unbent main grid line and the two main grid lines converge The connecting lines of the points overlap.

In the multi-grid battery sheet, when the number n of the busbars is an even number, preferably, all the busbars are bent.

In the present invention, the diameter of the busbars may be 50-300 microns, preferably 100-200 microns. The busbars may be metal wires, such as copper wires.

In the present invention, the auxiliary grid line may be silver, copper, tin, tin alloy and the like. The width of the auxiliary gate line may be 40-80 microns, and the thickness may be 5-20 microns. There may be 50-120 auxiliary grid lines, and the distance between two adjacent auxiliary grid lines may be 0.5-3 mm.

The utility model also provides a solar cell assembly, which includes several solar cells connected in series or in parallel, wherein the solar cells are the above-mentioned multi-grid cells provided by the utility model.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment, and within the scope of the technical concept of the utility model, the technical solution of the utility model can be carried out in many ways. These simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, the utility model will not further describe various possible combinations.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (12)

1. A multi-grid solar cell, characterized in that the light-receiving surface of the multi-grid solar cell is provided with a plurality of auxiliary grid lines and n main grid lines, and the auxiliary grid lines and the main grid lines are alternately arranged, The two opposite ends of the light-receiving surface are each provided with a busbar converging point, one end of the busbar converges at the busbar converging point at one end of the light-receiving surface, and the other end of the busbar Converging at the busbar converging point at the other end of the light-receiving surface, and n busbar lines are arranged symmetrically along the line connecting the two busbar converging points, wherein n or n-1 busbar lines are in the middle At least one bend occurs, and n≥4. 2. The multi-grid battery sheet according to claim 1, wherein each busbar is located on one side of the connecting line connecting the two busbar lines or on the connecting line . 3. The multi-grid battery sheet according to claim 1 or 2, wherein n is 6-20. 4. The battery sheet with multiple grid lines according to claim 1 or 2, characterized in that, a plurality of auxiliary grid lines are arranged parallel to each other. 5. The multi-grid battery sheet according to claim 4, characterized in that n or n-1 main grid lines are bent once in the middle, and each formed bending point is located on the same auxiliary grid line . 6 . The battery sheet with multiple grid lines according to claim 5 , wherein each bending point is a midpoint of a corresponding busbar line. 7 . 7 . The multi-grid battery sheet according to claim 1 or 2 , characterized in that, the connecting line of the convergence points of the main grid lines at the two ends is perpendicular to the auxiliary grid lines. 7 . 8. The battery sheet with multi-grid lines according to claim 5, characterized in that, on the sub-grid line where the bending point is located, in the contact points between each main grid line and the sub-grid line, any phase The distance between two adjacent contact points is equal. 9. The multi-grid battery sheet according to claim 1 or 2, wherein n is an odd number, there is one busbar that is not bent, and the busbar that is not bent and the two busbars The connecting lines of the sink points overlap. 10. The multi-grid battery sheet according to claim 1 or 2, wherein n is an even number, and all busbars are bent. 11. The multi-grid battery sheet according to claim 1 or 2, characterized in that the diameter of the busbars is 50-300 microns. 12. A solar cell assembly, comprising several solar cells connected in series or in parallel, characterized in that the solar cells are the multi-grid cell according to any one of claims 1-11.