Locking mechanism, locking system and vehicle

The invention provides a locking mechanism, a locking system and a vehicle, and the system comprises the locking mechanism which is used for fixing a battery pack or releasing the fixation of the battery pack through locking or unlocking; the controller is used for sending a control instruction; the power exchange gateway is used for controlling a vehicle-mounted external power supply to be electrically connected with a stepping motor in the locking mechanism according to the control instruction so as to drive a locking piece of the locking mechanism to be pushed into a locking hole or pulled out of the locking hole for locking or unlocking; and the air storage cylinder is used for supplying air to an air cylinder of the locking mechanism when the pressure meets a preset pressure value so as to drive a locking piece of the locking mechanism to be pulled out of the locking hole or pushed into the locking hole for unlocking or locking. When the locking piece cannot be driven through the air cylinder to achieve