LOCKING METHOD AND UNLOCKING METHOD

A locking method and an unlocking method are provided. The locking method is used to mount a battery to a fixing seat of an electric vehicle by a locking device. The locking device includes: a lock base including a lock body, a surface of the lock body being provided with a lock groove recessed towards the interior of the lock body, the lock body being internally provided with a lock tongue groove and a lock tongue movably mounted in the lock tongue groove, and the lock tongue groove being in communication with the lock groove; and a lock shaft including a shaft rod configured to be inserted into the lock groove of the lock base to perform unlocking and locking.