A solar cell surface grid wire structure

Abstract

The invention discloses a grid line design on surface of a solar battery, which comprises a plurality of ring-shaped thin grid lines arranged on the solar battery and are distributed with equal intervals, and two or more than two main grid lines arranged perpendicular to the ring-shaped thin grid lines, wherein the interval between adjacent two ring-shaped thin grid lines is 0.1 mm to 2 mm, and the width of each ring-shaped thin grid line is 1 mm to 10 mm. Through the grid line design on the surface of a line concentrating battery, the surface of each strip-shaped battery unit obtained by separation after cutting has same distribution; the ring-shaped thin grid lines are uniformly distributed at edges of strip-shaped batteries, so that not only the matching of the electrical properties of the all strip-shaped batteries is guaranteed, but also no thin grid line conduct sheltering for incident light when middle areas of the strip-shaped batteries affected by strong light intensity in medium and lower power concentrating photovoltaic application as the thin grid lines are distributed on edges of the batteries; therefore, the photoelectric converting efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, and in particular relates to a grid line design on the surface of a solar cell. Background technique [0002] The traditional process of preparing grid wire electrodes for ordinary crystalline silicon solar cells is generally to use screen printing to print silver paste on the emitter of the cell to form a specific pattern, and then sinter with the Al electrode on the back at high temperature to finally form the front and back electrodes. . In the case of a fixed area of ​​crystalline silicon cells, the grid design of solar cells is very important. It not only affects the effective light-receiving area of ​​solar cells, but also determines the series resistance of cells, thus affecting the power generation efficiency of solar cells. [0003] At present, dozens of solar cells are generally made into solar cell modules through single welding, series welding, stacking, lamination a...

AI Technical Summary

Problems solved by technology

Generally, the way to obtain strip-shaped crystalline silicon solar cells is to directly cut ordinary crystalline silicon solar cells to obtain them. However, the grid line design of ordinary crystalline silicon solar cells is based on the optimization of the power and cost of the entire solar cell. The surface grid lines are designed to be evenly distributed, so when cutting into strip batteries with a certain width, such as cutting into 3mm, the number and position of the surface grid lines on each battery obtained are not consistent, for example, some There is one thin grid line, and some have two, and some thin grid lines will be damaged when cutting the cell sheet, such as just cutting to the thin grid line, which leads to the obtained strip solar cell. The number and layout of grid lines present a certain degree of randomness, which affects the performance of the battery

On the other hand, when the strip battery is used in low-to-medium magnification concentrating conditions, since the concentrated light spot is generally concentrated in the middle of the battery, and the light spot is non-uniform, if the thin grid lines of the strip battery happen to be randomly Located in the middle of the battery, it will inevitably cause a relatively serious shading effect on the light in this area, thereby affecting the efficiency of the battery. The shading effect of the thin grid lines in different positions is different, resulting in differences in the efficiency of the battery

In addition, the ability of grid lines to collect photo-generated current is also different at different positions, so these factors lead to the performance of crystalline silicon cells designed with general grid lines after being cut into strip cells of the same size in actual use. The difference is large, resulting in performance mismatch in series or parallel, which affects the performance of low-to-medium concentrated photovoltaics or other products using strip batteries

Therefore, when the existing ordinary crystalline silicon cells are cut and used in low-to-medium concentration photovoltaic products, the efficiency cannot be maximized.

Images