Half-chip assembly

Abstract

The invention provides a half-chip assembly, comprising a plurality of solar cell strings and a junction box, wherein, a plurality of solar cell strings are arranged in parallel, and each solar cell string comprises a plurality of half-chip cells connected in series; The number of solar cell strings is an integer multiple of 4. The positive and negative electrodes of the solar cell strings in eachgroup are arranged in the same direction, and the positive and negative electrodes of the solar cell strings in the two adjacent groups are arranged in the opposite direction. The solar cell string in each group is connected in parallel to form a solar cell string group through a bus bar, and the adjacent solar cell string groups are connected in series to form a battery loop through the bus bar,and the positive and negative electrodes of the battery loop are located on the same side of the half-chip module. The junction box is arranged on the same side as the positive and negative electrodes of the battery circuit, and the bus bar on the same side as the positive and negative electrodes of the battery circuit is connected into the junction box, and the positive and negative electrodes of the half-piece assembly are led out from the junction box. The half-chip assembly provided by the invention has high reliability and high conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of photovoltaics, in particular to a half-chip module. Background technique [0002] The cells obtained by cutting the solar cells of standard specifications (that is, the solar cells with the shape of the positive direction or the rounded positive direction) are called half cells. For example, after cutting a solar cell of 125mm×125mm, two half cells of 125mm×62.5mm can be obtained, and by cutting a solar cell of 156mm×156mm, two half cells of 156mm×78mm can be obtained. Correspondingly, an assembly made of several half-cell batteries connected and packaged is called a half-cut assembly. At present, the mainstream half-cut modules on the market are composed of 120 (6 columns×20 rows) half-cut cells or 144 (6 columns×24 rows) half-cut cells. Among them, according to the different lead-out methods of the bus bar, the half-cut module can be divided into the middle lead-out type and the edge lead-out type. ...

AI Technical Summary

Problems solved by technology

Specifically, the middle lead-out half-cut module requires opening a hole in the middle of the back plate of the module. This design method will increase the stress concentration at the opening, which will lead to a decrease in the overall mechanical load-carrying capacity of the module, which in turn will lead to a decrease in the reliability of the half-cut module. reduce

The edge-leading half-cut module requires a bus bar that runs through the head and tail of the module. Although this design method satisfies the rationality of the module circuit design, it increases the area of ​​the module and reduces the conversion efficiency of the half-cut module.

In addition, the bus bar running through the head and tail of the module also destroys the symmetry of the half-cut module, which affects the aesthetics of the half-cut module

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