Acid return structure of maintenance-free storage battery cover

The utility model belongs to the technical field of storage batteries, and particularly relates to an acid return structure of a maintenance-free storage battery cover, which comprises a protective shell and a storage battery, the storage battery is mounted in the protective shell, a protective device is mounted at the top of the protective shell, and the protective device comprises a dismounting unit, a fixing unit and a buffering unit. The dismounting unit is installed on the top of the protective shell, the fixing unit is installed on the side face of the protective shell, and the buffering unit is installed in the protective shell. According to the acid return structure of the maintenance-free storage battery cover, the left side protection cover and the right side protection cover are movably connected through a connecting shaft in an overturning groove by mounting and dismounting units, so that the left side protection cover or the right side protection cover can be overturned unilaterally, and an elect