Back contact photovoltaic module

A back contact photovoltaic module, comprising:

• solar cells, wherein one respective solar cell of the solar cells includes a first surface, a plurality of bus bars and a plurality of finger electrodes formed on the first surface;
• and
• insulation portions arranged on the first surface;
• wherein the plurality of finger electrodes include first finger electrodes and second finger electrodes extending along a first direction and alternatingly arranged along a second direction, the first direction intersecting the second direction, and the first finger electrodes are of a polarity that is different from a polarity of the second finger electrodes;
• wherein the plurality of bus bars include first bus bars and second bus bars extending along the second direction and alternatingly arranged along the first direction, each first bus bar of the first bus bars is in electrical contact with a respective plurality of first finger electrodes of the first finger electrodes, and each second bus bar of the second bus bars is in electrical contact with a respective plurality of second finger electrodes of the second finger electrodes;
• wherein each bus bar of the plurality of bus bars includes a respective main body extending along the second direction and respective welding portions formed at intervals on the respective main body, and each welding portion of the respective welding portions has a dimension larger than a dimension of the respective main body in the first direction;
• wherein the insulation portions are configured to cover at least ends of the first finger electrodes facing any of the second bus bars and ends of the second finger electrodes facing any of the first bus bars, the insulation portions includes first insulation portions and second insulation portions, the first insulation portions are respectively arranged on opposing sides of the main body of a respective bus bar in the first direction, and are respectively arranged to adjacent to the welding portions of the respective bus bar in the second direction, and the second insulation portions are respectively arranged on opposing sides of the main body of the respective bus bar and space apart from the main body of the respective bus bar in the first direction;
• and
• wherein in the first direction, two first insulation portions of the first insulation portions respectively arranged on opposing sides of the main body of the respective bus bar are spaced apart by a first distance, and two second insulation portions of the second insulation portions respectively arranged on opposing sides of the main body of the respective bus bar are spaced apart by a second distance that is greater than the first distance.