Power bank assembly

A power bank assembly, comprising:

• a housing having a space defined therein for accommodating components of an electronic device and having a first end and a second end opposite the first end;
• a power bank casing having a first end and a second end, wherein the first end of the power bank casing is adjacent to the first end of the housing, and the second end of the power bank casing is adjacent to the second end of the housing;
• a clasp structure correspondingly formed on the first end of the housing and the first end of the power bank casing to enable the first end of the housing to engage with the first end of the power bank casing and to allow the housing to rotate relative to the power bank casing and about the first end of the housing serving as a pivot;
• and
• a fastening structure correspondingly formed on the second end of the housing and the second end of the power bank casing, the fastening structure comprising:
• a screw hole formed on the second end of the housing;
• and
• a screw and a spring correspondingly disposed on the second end of the power bank casing, wherein the housing touches a top surface of the screw to force the screw to move towards a bottom of the power bank casing and compress the spring, and the screw pushed by the housing is forced by the spring to slide into the screw hole and tightened in the screw hole to secure the housing to the power bank casing.