Electrical connection device

An electrical connection device used to be provided in an electronic device casing, the electrical connection device comprising:

• a first circuit board having a first side edge;
• a second circuit board substantially coplanar with the first circuit board and having a second side edge opposite to the first side edge;
• a receptacle connector provided to the first circuit board and closely adjacent to the first side edge, comprising
• an housing having a first mounting surface abutting against a board surface of the first circuit board, a first mating surface, and a pair of sliding contact grooves respectively adjacent to both sides of the first mating surface, and the first mating surface and the sliding contact grooves being substantially perpendicular to a plane where the first mounting surface is present;
• and
• a plurality of first terminals each having a first fixed portion fixedly provided to the housing, a first contact portion exposed from the first mating surface, and a first tail portion exposed from the first mounting surface and electrically connected to the first circuit board;
• and
• a plug connector provided to the second circuit board and partially protruding from the second side edge, comprising
• an body, having a second mounting surface abutting against a board surface of the second circuit board, a second mating surface substantially perpendicular to a plane where the second mounting surface is present and corresponding to the first mating surface, and a pair of side flanges respectively adjacent to both sides of the second mating surface and respectively engaged with and received in the sliding contact grooves;
• and
• a plurality of second terminals each having a second fixed portion fixedly provided to the body, a second contact portion exposed from the second mating surface, and a second tail portion exposed from the second mounting surface and electrically connected to the second circuit board, the second contact portions of the second terminals respectively contacting the first contact portions of the first terminals so as to form an electrical connection.