Circuit board, circuit board assembly, and electronic device

A circuit board assembly, comprising:

• a circuit board body, comprising a first surface;
• a first group of pads and a second group of pads, wherein the first group of pads and the second group of pads are disposed on the first surface, the first group of pads is distributed along a first ring, the first group of pads comprises first pads, and the first pads are arranged on an edge that is of the first ring and that is close to the second group of pads, wherein
• the second group of pads and the first pad are distributed along a second ring;
• a first shielding case, wherein the first shielding case comprises a first sidewall, and the first sidewall forms a sidewall that is of the first shielding case and that is close to the second group of pads;
• the first sidewall comprises a first main body portion and a first flange portion, and the first flange portion is located on an outer surface that is of the first main body portion and that is close to one end of the first pad;
• and the first main body portion and the first flange portion are connected to the first pad;
• and
• a second shielding case, wherein the second shielding case comprises a second sidewall, and the second sidewall forms a sidewall that is of the second shielding case and that is close to the first sidewall;
• and the second sidewall is at least partially located on a side that is of the first flange portion and that is back-to-back with the first pad, and the second sidewall is at least partially connected to the first flange portion.

A circuit board assembly, comprising:

• a circuit board body, comprising a first surface;
• a first group of pads and a second group of pads, wherein the first group of pads and the second group of pads are disposed on the first surface, the first group of pads is distributed along a first ring, the first group of pads comprises first pads, and the first pads are arranged on an edge that is of the first ring and that is close to the second group of pads, wherein
• the second group of pads is distributed along a second ring, the second group of pads comprises second pads, and the second pads are arranged on an edge that is of the second ring and that is close to the first group of pads;
• and
• the edge that is of the first ring and that is close to the second group of pads overlaps the edge that is of the second ring and that is close to the first group of pads to form an overlapping edge, and the first pads and the second pads are alternately disposed along the overlapping edge;
• a first shielding case, wherein the first shielding case comprises a first sidewall, and the first sidewall forms a sidewall that is of the first shielding case and that is close to the second group of pads;
• the first sidewall comprises a first main body portion and a first flange portion, and a plurality of first flange portions are located on an outer surface that is of the first main body portion and that is close to one end of the first pad;
• and the first flange portion comprises first convex portions and first concave portions, the first convex portions and the first concave portions are alternately disposed along the overlapping edge, and the first pad is at least partially opposite to and connected to the first convex portion;
• and
• a second shielding case, wherein the second shielding case comprises a second sidewall, and the second sidewall forms a sidewall that is of the second shielding case and that is close to the first group of pads;
• the second sidewall comprises a second main body portion and a second flange portion, and a plurality of second flange portions are located on an outer surface that is of the second main body portion and that is close to one end of the second pad;
• and the second flange portion comprises second convex portions and second concave portions, the second convex portions and the second concave portions are alternately disposed along the overlapping edge, and the second pad is at least partially opposite to and connected to the second convex portion.