Self-locking mechanism of cell box and cell box using same

The utility model discloses a self-locking mechanism of a cell box and the cell box using the self-locking mechanism. The cell box comprises the self-locking mechanism, wherein the self-locking mechanism comprises a locking structure fixedly arranged on the cell box; the locking structure comprises a lock head and a lock tongue; the self-locking mechanism further comprises a lock tongue disengagement-preventing structure; the lock tongue disengagement-preventing structure comprises a lock tongue positioning pin; the lock tongue positioning pin is provided with a pressure spring; the lock tongue is provided with a locking disengagement-preventing step; the left side and the right side of the locking disengagement-preventing step on the lock tongue are provided with a lock tongue locking position and a lock tongue unlocking position which respectively correspond to the locking state and the unlocking state of the locking structure; the locking disengagement-preventing step is provided with a locking disengagement-preventing stopping surface facing to one side of the lock tongue locking position; the lock tongue positioning pin is provided with a lock tongue positioning pin locking surface which is used for being matched with the locking disengagement-preventing stopping surface in a corresponding disengagement-preventing way when the locking structure in a locking state; and when the lock tongue is moved under the action of external surface to unlock, the lock tongue positioning pin spans the locking disengagement-preventing stopping surface from the lock tongue locking position to reach the lock tongue unlocking position.