The invention relates to a back contact
solar cell string and preparation method thereof, a component, and a
system. The back contact
solar cell string comprises a back contact
solar cell and a conductive part electrically connected with the back contact solar
cell; an emitter segmented
electrode of an emitter p+ region and the segmented
electrode of a base n+ region are arranged on the back surface of the segmented
electrode of the emitter; an emitter
metal wire electrode is arranged on the emitter segmented electrode, a
base metal wire electrode is arranged on the base segmented electrode, the emitter
metal wire electrode and the
base metal wire electrode reversely extend out a battery piece; the emitter
metal wire electrode of the back contact solar
cell is electrically connected with the
base metal wire electrode of an adjacent back contact
solar battery through the conductive piece. The back contact solar
cell string disclosed by the invention has the advantages that the operation is simple, the high-precision
welding equipment alignment is unnecessary, the
horizontal transmission loss of the carrier between the electrodes is reduced, a
fill factor of the cell is improved, the short-circuit current of the component is lowered, thereby obviously lowering the component encapsulation loss.