Manufacturing method of back-contacted solar cell bunches

Abstract

The invention discloses a manufacturing method of the back-contacted solar cell bunches. A plurality of battery pieces are welded into a bunch through a net made of straight solder strips. Positive and negative electrodes of the battery pieces are in linear arrangement and are spaced apart. The distances of any two adjacent rows of positive and negative electrodes are the same, and electrode patterns of the adjacent battery pieces are the same. Opposite electrodes of the adjacent battery pieces are welded on the same solder strip without rotating the battery pieces. After the battery pieces are welded, solder strips of odd number or even number between the adjacent battery pieces are cut off, so that the adjacent battery pieces are connected in series. The manufacturing method of the back-contacted solar cell bunches has the advantages that welding is rapid, precision is high, number of solder strips is increased greatly, and quantity of battery piece electrodes is increased accordingly. Further, density of electrodes is increased, influence on component performance caused by fragments is decreased, problem of interconnection of back-contacted solar cells is solved creatively, and the method has significance in promoting technology leapfrogging of photovoltaic industry. Compared with other welding technologies, the manufacturing method of the back-contacted solar cell bunches is simple in technological process and helpful in decreasing fragments and realizing automation.

Description

technical field [0001] The invention relates to a manufacturing method of a back-contact solar cell string, which can realize the manufacturing of the back-contact solar cell string at low cost. It belongs to the field of solar photovoltaic. Background technique [0002] Solar energy is abundant and widely distributed, and it is the renewable energy with the greatest development potential. With the increasingly serious problems of global energy shortage and environmental pollution, solar photovoltaic power generation has become an emerging industry that is widely concerned and focused on development because of its clean, safe, convenient, and high-efficiency characteristics. In this context, in recent years, the photovoltaic industry has grown rapidly, the scale of the industry has continued to expand, and the cost of products has continued to decline. It is estimated that by 2015, the domestic photovoltaic installed capacity target will reach 10GW, and by 2020 it will rea...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the positive and negative electrodes are required to be symmetrically distributed, which destroys the principle of uniform electrode distribution and is not conducive to current collection; secondly, the rotation of adjacent cells by 180 degrees will increase the probability of fragmentation and increase the difficulty of automation

[0007] 3. Chinese patent 201210188615.2 discloses a method of connecting adjacent back-contact cells in series with folded or curved ribbons, without rotating the battery sheets 180 degrees during serial welding; the folded or curved ribbons are produced by punching and shearing, and the same as through the calendering process Compared with the straight ribbon produced, the flatness of the folded or curved ribbon is reduced. The disadvantage of this technology is that it is easy to cause battery fragments, resulting in mismatching of the cells in the module, and a large drop in power.

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