Back contact battery assembly and photovoltaic system

Abstract

The utility model discloses a back contact battery assembly and a photovoltaic system, the battery assembly comprises a battery string, a first insulating strip, a second insulating strip, a third insulating strip and a fourth insulating strip, the battery string comprises battery pieces which are connected in series, the battery pieces comprise a first battery piece and a second battery piece which are arranged along a first direction, and the first battery piece is arranged at the end part of the battery string; the first insulating strip is arranged at one end, close to the first battery piece, of the second battery piece, the first bus bar is arranged on one side, back on to the second battery piece, of the first insulating strip, the first insulating strip and the first bus bar are arranged in an extending mode in the second direction, and the first welding strip is used for electrically connecting the first bus bar and the first battery piece. The end, close to the first battery piece, of the first bus bar is provided with an extension section, the extension section extends out of the edge of the first insulating strip in the first direction and is electrically connected with the first welding strip, and a connecting end is formed at the connecting position of the extension section and the first welding strip. According to the utility model, the effective light-receiving area of the battery assembly can be increased, the conversion efficiency of the assembly can be improved, the observed area of the bus bar from one side of the light-receiving surface is smaller and even can be completely hidden, the production difficulty can be effectively reduced, the risks of subfissure and fragmentation of the battery piece can be reduced, and the reliability can be improved.

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