Electrode structure with grid lines on front surface

Abstract

The invention discloses an electrode structure with grid lines on the front surface. The electrode structure comprises a plurality of first secondary grid lines (11) and at least two main grid lines (20) which are intersected with the first secondary grid lines (11), wherein each main grid line (20) is divided into a plurality of sections which are connected through connecting lines (22); third secondary grid lines (13) are also arranged on the front section and the tail section of each main grid lines (20); internally embedded sections (13b) of each third secondary grid line (13) are overlapped with the corresponding front sections or tail sections; and exposed sections (13a) of each third secondary grid line (13) are intersected with the first secondary grid lines (11). By adopting the electrode structure with the grid lines on the front surface, in a secondary overprinting process, counterpoint printing can be quickly and accurately performed, the using amount of silver slurry is reduced, and the battery conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of crystalline silicon solar cells, in particular to a front grid line electrode structure of a crystalline silicon solar cell manufactured by a secondary overprinting process. Background technique [0002] In the front grid electrode of the solar cell, the function of the auxiliary grid is to collect photo-generated carriers. In order to reduce the series resistance, the larger the aspect ratio, the better, while the main grid is mainly for component welding, not to collect The function of the current, no need to pursue the aspect ratio. But at present, since the main grid lines and the sub grid lines are printed with the same screen, while pursuing the aspect ratio of the sub grid lines, the height of the main grid lines will also increase accordingly, which increases the amount of silver paste used. Increased production costs. [0003] The website of the State Intellectual Property Office discloses a pa...

AI Technical Summary

Problems solved by technology

[0003] The website of the State Intellectual Property Office discloses a patent application document for a secondary overprinting process, which separates and prints the main grid line and the sub grid line of the front electrode by adding a printing process, but the patent application document only provides a process , simply printed the main grid lines and auxiliary grid lines separately, without redesigning the front grid line electrode structure, the cell efficiency was not further improved, and the amount of paste used did not get the expected reduction. The other two There is an alignment process in printing, and the busbars are easy to print offset, which makes it difficult to solder components

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