A galvanic element in round cell form has a closed fluid-tight housing comprising a cell cup and a lid insulated from it by a seal. The seal is formed from a sealing blank made by deep drawing from a plastic foil. The sealing mould is shrink-fitted on the edge of the cell lid. Its thickness is between 0.1 and 0.3 millimetres and it is made from a polyamide. Before the deep-drawing process the plastic foil is heated to a temperature of 100 to 120 degC. The drawing is done in a vacuum.
