Repair method for short circuit between MWT photovoltaic module strings

Abstract

The invention discloses a repair method for short circuit between MWT photovoltaic module strings. The repair method comprises the steps of: step 1, judging a cause of a defect module according to an EL picture, and determining that the defect module is caused by inter-string short circuit; step 2, finding out a position of residual metal foil according to the EL picture and a circuit board of the metal foil, irradiating a cell panel surface corresponding to the residual metal foil with lamplight, determining a residual length of the metal foil on a gap, and marking the length on a back plate; step 3, stripping off the back plate and EVA at the residual position according to the mark, slitting the residual metal foil at the gap, and finally tearing down the residual metal foil, wherein the slitting width of the metal foil ought to be smaller than a battery string interval; step 4, subjecting the module processed in the step 3 to an EL test, and confirming whether an anomaly occurs or not; step 5, and sequentially laying the EVA and the back plate on the back plate side of the module undergone the step 4, and placing the laminated module into a laminating machine for further lamination. According to the repair method, the module to be repaired can be repaired without removing the back plate, the time consumption of the process is shorter, and the production and manufacturing cost is low.

Description

technical field [0001] The invention relates to a repair process, in particular to a method for repairing a short circuit between MWT photovoltaic module strings, and belongs to the technical field of MWT solar cell module processing. Background technique [0002] MWT (Metal Wrap Through) photovoltaic module is a photovoltaic module based on a new metal foil circuit design. The cells are interconnected by conductive glue and metal foil circuit to form a complete circuit. During the production process of the conductive core board, there are often metal foil residues in the gaps, which leads to short circuits between the finished component strings. In the existing rework process, most of the methods are to peel off the whole backplane, and then rework the components. After the rework is successful, then cover the EVA and the backplane for lamination. In the existing operation, after the backplane is peeled off by heating to melt the EVA, the backplane is peeled off manually o...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to solve the short circuit problem of MWT photovoltaic modules caused by residual metal foil gaps, thereby providing a repair method suitable for short circuits between MWT photovoltaic module strings