The utility model discloses a solar energy battery and a module thereof, comprising a basal plate, a passivation layer configured on the basal plate, a plurality of opening holes on the passivation layer, and a plurality of secondary electrodes in the plurality of opening holes and in contact with the back surface. Without any increase in the multiple hole relative to the passivation layer under the condition of the rear projection area ratio, the plurality of holes are extended toward different directions and in different arrangement structures, so that the plurality of second electrodes are uniformly distributed on the back surface in order to increase the chance of guiding out the basal plate and improve the capability of collecting carrier. In the meantime, the rate of the passivation layer area is not reduced and the passivation layer has good quality. As a result, the open circuit voltage and the photoelectric conversion efficiency can be improved and the series resistance is reduced.