Abstract: The disclosure provides a method for heat-treating a boron steel, which includes: carburizing a boron steel on a surface thereof to obtain a carburized boron steel; austenitizing the carburized boron steel at a temperature of 885-895° C. for 25-35 min, to obtain an austenitized boron steel; sequentially subjecting the austenitized boron steel to an oil quenching and a tempering, wherein the oil quenching is performed at a temperature of 55-65° C. for 29-31 min.

Abstract: A photovoltaic assembly includes a cell unit layer, a backplate and a reflective layer. The backplate is provided on a back side of the cell unit layer, and one side of the backplate away from the cell unit layer is provided with at least one junction box. The reflective layer is disposed between the cell unit layer and the backplate. The reflective layer includes a plurality of reflective longitudinal strips. Each of the plurality of reflective longitudinal strips covers edges of cell chips within at least one cell string. At least one of the plurality of reflective longitudinal strips is broken at a location adjacent to a cell chip covered by the junction box so as to form at least one opening.