Secondary battery top cover structure

The utility model discloses a top cover structure of a secondary battery. Top cover plate, pole holes are formed in the top cover plate in a penetrating manner; the pole holes comprise a positive polehole and a negative pole hole; pole assemblies are arranged on the pole holes; the pole assembly comprises a pole, a sealing ring, an upper injection molding piece and a connecting piece; the connecting piece comprises a connecting piece outer ring and a connecting piece inner ring; the connecting piece inner ring is hollow, the connecting piece inner ring is located in the pole hole, the sealingring is fixedly connected with the surface of the top cover plate, the pole comprises a pole protrusion and a pole outer ring, the pole protrusion penetrates through the sealing ring to be matched with the connecting piece inner ring, an upper injection molding piece is arranged in a gap between the pole outer ring and the top cover plate, and a lower injection molding piece is arranged on the lower surface of the top cov