Back contact cell and photovoltaic module

A back contact cell, comprising:

• a cell substrate;
• a first busbar and a second busbar alternately arranged on the cell substrate in a first direction, the first busbar comprising a plurality of first sections spaced apart in a second direction, and the second busbar comprising a plurality of second sections spaced apart in the second direction;
• a first through-wire extending in the first direction and in contact connection with a plurality of first sections in a same row in the first direction;
• and
• a second through-wire extending in the first direction and in contact connection with a plurality of second sections in a same row in the first direction;
• wherein the first through-wire and the second through-wire adjacent to each other form a through-wire set, the number of the through-wire set is designed to decrease as the number of busbars increases;
• and wherein when the number of the busbars is less than 21, the number of the through-wire set is greater than 4, the number of the busbars being a sum of the number of the first busbar and the number of the second busbar.