Subway storage battery system with self-locking function

The utility model relates to the technical field of rail transit. The utility model relates to a storage battery system, in particular to a subway storage battery system with a self-locking function.The device comprises a box, trays and battery packs, battery pack placed in tray, the tray is connected with the box body through telescopic guide rails on two sides; a self-locking structure is arranged between the tray and the box body; the self-locking structure comprises a limiting mechanism installed on the box body and a buckle installed on the tray. The limiting mechanism comprises a rotating handle, a limiting plate and a rotating shaft; the rotating shaft connects the rotating handle and the limiting plate; the rotating handle freely rotates along the rotating shaft; a guide inclinedsurface is arranged at the end part of the buckle; a clamping groove is formed in the guide inclined surface; during locking, the guide inclined surface penetrates into the guide hole in the limitingplate; during unlocking, th