Sealing structure of lead pipe of lead-acid storage battery

The utility model relates to a sealing structure of a lead pipe of a lead-acid storage battery. The sealing structure is used for solving the problem of acid climbing of a storage battery terminal. The technical scheme adopted by the utility model is as follows: the sealing structure comprises one lead pipe, wherein the lower part of the lead pipe is a plastic coated part; a plastic layer is coated at the outside of the plastic coated part; the sealing structure is characterized in that the plastic coated part of the lead pipe is provided with annular grooves; an annular bulge is formed between adjacent annular grooves; the longitudinal sections of the annular grooves are in ladder shapes, i.e., a gap the tops of the annular grooves is less than that at the bottoms of the annular grooves and the thickness of the top of the bulge is larger than that of the bottom of the bulge. Because the gap of the bottoms of the annular grooves of the lead pipe is larger and the gap of the tops of the annular grooves is smal