Method for reducing hidden cracking of back electrode region of MWT (Metal Wrap Technology) battery

Abstract

The invention discloses a method for reducing hidden cracking of a back electrode region of a MWT (Metal Wrap Technology) battery. In the preparation process of a positive electrode region of a back electrode of the MWT battery, hollow-out and antenna designs are adopted for the positive electrode region; the hollow-out design is that a plurality of non-printing regions are arranged in a middle region of a positive pole printing region, and the antenna design is that a plurality of printing regions are arranged in an edge region of the positive pole printing region; in the preparation processof an aluminium back field, a hollow-out design is adopted for a region of the aluminium back field, which is overlapped with the positive electrode region; and the hollow-out design of the aluminiumback field is that a plurality of non-printing regions are arranged in the overlap region of the aluminium back field and the positive electrode region. The hollow-out design of the positive electroderegion can effectively reduce an overall height of the positive electrode region under the condition of ensuring that a welding area of a component is unchanged, and the antenna design can reduce a coverage area of the overlap region under the condition of effectively ensuring current transmission of the positive electrode region and the aluminium back field. The hollow-out design of the overlapregion of the aluminium back field can reduce a height of the overlap region under the condition of ensuring that an area of the overlap region of the aluminium back field and the positive electrode region is unchanged.

Description

technical field [0001] The invention relates to a method for reducing hidden cracks in the electrode region on the back of a MWT battery, and belongs to the technical field of processing of MWT solar battery components. Background technique [0002] Currently, crystalline silicon solar technologies include heterojunction solar cells (HIT), back contact silicon solar cells (IBC), emitter wrap-through silicon solar cells (EWT), laser grooved buried gate cells, inclined evaporated metal contact silicon solar cells Solar cell (OECO) and metal perforated silicon solar cell (MWT), among which MWT cell has received more and more attention because of its high efficiency, small shading area and better appearance. [0003] MWT crystalline silicon solar cells transfer the energy collected by the light-receiving surface through the cell to the electrode on the backlight surface of the cell through laser drilling, so as to reduce the shading area of ​​the light-receiving surface to achie...

AI Technical Summary

Problems solved by technology

[0005] Due to the need for back current collection, the aluminum back field and the positive pole need to overlap to ensure current transmission, and the height of the overlapping area is higher than the height of the positive pole and the aluminum back field. Unreasonable design will easily lead to subsequent battery processes, packaging and transportation, and components. Fragmentation rate rises

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