A lock, a lid lock and a locking mechanism are provided. The lock includes a base, and a driving mechanism, a connecting mechanism and a locking mechanism which are provided on the base. The base is buckled to a housing. The connecting mechanism has a first end connected to the driving mechanism, and a second end thereof connected to the locking mechanism. The locking mechanism is rotatably connected to the base to perform a locking operation or an unlocking operation. A return spring is sleeved on the locking mechanism, one end of the return spring is connected to the housing, and the other end to the locking portion of the locking mechanism. The locking mechanism is connected to a control system. In the unlocking operation, the control system determines that the locking portion is disconnected to the return spring according to the locking portion in an unfolded position relative to the base, and determines that the locking mechanism is connected to the return spring according to the locking mechanism in a retracted position relative to the base.