A half-cell assembly includes an integrated junction box and multiple cell string sets connected in series sequentially. Each cell string set includes multiple cell strings connected in parallel, and each cell string includes multiple half-cells connected in series sequentially. The multiple cell string sets are arranged along a first preset direction. In each cell string set, the multiple cell strings are arranged along the first preset direction. In each cell string, the multiple half-cells are arranged along a second preset direction. One of the first preset direction and the second preset direction is the long side direction of the half-cell, and the other is the short side direction of the half-cell. The integrated junction box and the multiple cell string sets are arranged along the second preset direction. The multiple cell string sets are connected in parallel with diodes of the integrated junction box.