The invention concerns a positioning spacer (7, 9) for positioning electrical energy storage elements (3), such as supercapacitors or ultracapacitors connected in series, in an electrical energy storage module, characterised in that the spacer comprises a first support part (6) and a second part (71) forming a rim (71) relative to the first part (6), the positioning spacer (7) comprising, at the free end of the second part (71) thereof, at least one housing recess, the spacer being made from an electrically insulating material.