The invention discloses a metallization method for a back contact
solar battery. The metallization method for the back contact
solar battery includes the following steps that firstly, a through hole
electrode is manufactured, at least one N
type metal contact column is formed, and the
diameter of the N
type metal contact is 0.5-1 mm; secondly, a
metal layer is arranged in a
P type doping area or a P+
doping area of the back face of a
semiconductor substrate; thirdly, the position, opposite to the N type
meal contact column, on the
metal layer of the back face is provided with bar-shaped insulating medium
layers; fourthly, second
metal layers are arranged on all the insulating medium
layers, and the second metal layers are electrically connected with N
type metal contacts below the second metal layers, and a
welding electrode is formed. The invention discloses a metallization preparing method of the back contact
solar battery, the insulating medium layers and the second metal layers are led in, the
maximum efficiency is achieved, electric leakage caused by contact between metal and a
semiconductor is reduced, and meanwhile consumption of Ag metal
slurry is reduced. The battery efficiency obtained before and after with the method is promoted by 0.4 percent, and an unexpected effect is obtained.