A solar cell, comprising: a substrate having first edges and second edges , wherein the first edges comprises two opposite edges of the substrate along a second direction (Y) and the second edges are comprises two opposite edges of the substrate along a first direction (X); a passivation layer disposed on the substrate ; a plurality of secondary electrodes arranged at intervals along the second direction (Y) on the substrate , wherein each of the plurality of secondary electrodes extends along the first direction (X), and penetrates through the passivation layer to be in contact with the substrate ; two first main electrodes , disposed on a surface of the passivation layer, wherein each of the two first main electrodes is close to a corresponding first edge and comprises a plurality of first sub-connection pads arranged at intervals along the second direction and a first connection wire , and the first connection wire is in contact with a side of each of at least one of the plurality of first sub-connection pads close to the corresponding first edge ; and at least two second main electrodes , where the at least two second main electrodes are disposed on the surface of the passivation layer, and are disposed between the two first main electrodes , wherein each of the at least two second main electrodes comprises a plurality of second sub-connection pads arranged at intervals along the second direction (Y) and a second connection wire , and the second connection wire is in contact with at least one of the plurality of second sub-connection pads , wherein a first pitch (m) between a respective first main electrode and a second main electrode adjacent to the respective first main electrode is not equal to a second pitch (n) between adjacent second main electrodes . a substrate having first edges and second edges , wherein the first edges comprises two opposite edges of the substrate along a second direction (Y) and the second edges are comprises two opposite edges of the substrate along a first direction (X); a passivation layer disposed on the substrate ; a plurality of secondary electrodes arranged at intervals along the second direction (Y) on the substrate , wherein each of the plurality of secondary electrodes extends along the first direction (X), and penetrates through the passivation layer to be in contact with the substrate ; two first main electrodes , disposed on a surface of the passivation layer, wherein each of the two first main electrodes is close to a corresponding first edge and comprises a plurality of first sub-connection pads arranged at intervals along the second direction and a first connection wire , and the first connection wire is in contact with a side of each of at least one of the plurality of first sub-connection pads close to the corresponding first edge ; and at least two second main electrodes , where the at least two second main electrodes are disposed on the surface of the passivation layer, and are disposed between the two first main electrodes , wherein each of the at least two second main electrodes comprises a plurality of second sub-connection pads arranged at intervals along the second direction (Y) and a second connection wire , and the second connection wire is in contact with at least one of the plurality of second sub-connection pads , wherein a first pitch (m) between a respective first main electrode and a second main electrode adjacent to the respective first main electrode is not equal to a second pitch (n) between adjacent second main electrodes . <EOS>