The invention provides a preparation method of a back contact
cell assembly and the back contact
cell assembly, and relates to the technical field of solar cells, a long
cell string is firstly prepared, confluence fixing glue
layers are formed on the back surfaces of a first piece, a
tail piece and a middle piece, and then a first
interconnection strip and a second
interconnection strip are arranged. A plurality of long battery strings are then laid on the substrate. And an insulating isolation strip is arranged on the second
interconnection strip at the preset position. And then
bus bars are arranged on the insulating isolating bars and the
bus fixing
adhesive layer, and finally, a back plate is laid and laminated
welding is carried out. Compared with the prior art, the
bus bar can be hidden on the back surface of the battery, so that the size of the battery is increased, the space
utilization rate of the module is improved, and the power of the module is improved. And meanwhile, by preparing the bus bar fixing
adhesive layer in advance, high-temperature
welding on the edge of the battery piece when the bus bar is fixed in the conventional technology is avoided, the warping phenomenon of the battery piece can be effectively avoided, the risk of subfissure or piece
cracking is reduced, and the quality and yield of the battery are improved.