The invention relates to a module comprising at least two electrical energy storage assemblies (20), each storage assembly (20) comprising a first face topped by a cover (30) electrically connected to said energy storage assembly (20) and a second face opposite the first face, each cover being in contact with a respective end of a strip (40) in order to electrically connect the two storage assemblies (20), in which the strip (40) and the faces of the covers (30) in contact with the strip (40) are flat, the strip (40) being welded to the faces of the covers (30) along weld leads (50, 50′).