Manufacturing method of metallization wrap-through (MWT) battery

Abstract

The invention provides a manufacturing method of a metallization wrap-through (MWT) battery, and the manufacturing method comprises the following steps of symmetrically perforating a silicon chip so as to acquire a plurality of through holes which are symmetrically distributed in the silicon chip; carrying out the diffusion technique on the silicon chip; scribing the surface of the diffused silicon chip according to the through holes so as to divide the silicon chip into a plurality of sub-cells, and ensuring that each sub-cell comprises a through hole; printing a front electrode on the front surface of the silicon chip; printing an aluminum back surface field on the back surface of the silicon chip; and printing a connecting electrode on the back surface of the silicon chip, and making the sub-cells mutually connected with each other in series in the longitudinal direction and mutually connected with each other in parallel in the transverse direction, wherein the front electrode is communicated with the connecting electrode through the through hole. According to the manufacturing method of the MWT battery, one silicon battery chip is physically divided into a plurality of sub-cells, and the sub-cells are connected with one another in series or in parallel, so that the efficiency bottleneck caused by the nonuniformity of material impurities and nonuniformity in diffusion can be reduced.

Description

technical field [0001] The invention relates to the field of solar cell manufacturing, in particular to a method for manufacturing MWT (Metallisation Wrap-Through, metal perforated winding) cells. Background technique [0002] When non-renewable energy sources such as electricity, coal, and oil are running out frequently, and energy issues have increasingly become a bottleneck restricting the development of the international society and economy, more and more countries have begun to implement the "Sunshine Plan" to develop solar energy resources and seek new impetus for economic development. The solar cell manufacturing industries of various countries are scrambling to invest huge sums of money and expand production in order to compete for a place. [0003] The photoelectric conversion efficiency of a solar cell is closely related to the light-receiving area of ​​the front surface of the cell. Traditional solar cells are limited by their front electrodes and are prone to lo...

AI Technical Summary

Problems solved by technology

Traditional solar cells are limited by their front electrodes and are prone to loss of a large amount of light-receiving area, resulting in low photoelectric conversion efficiency

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