Fan device group, fan device and connecting piece

The invention discloses a fan device group, fan devices and a connecting piece. The fan device group comprises two fan devices and at least one connecting piece. Each fan device comprises a fan frame, a fan blade and at least one first terminal. The fan frame is provided with at least one first clamping groove. The fan blades are rotatably arranged on the fan frame. The at least one first terminal is located in the at least one first clamping groove. The at least one connecting piece comprises a first connecting block and two second terminals. The first assembling block comprises two first clamping parts which are connected with each other; the two second terminals are respectively arranged on the two first clamping parts. The two first clamping parts of the first assembling block are respectively clamped in the at least two first clamping grooves of the two fan frames, and the two second terminals are respectively inserted and electrically connected with the at least two first terminals. 一种风扇装置组、风扇装置及衔接件，风扇装