Capacitive element including a separator adhered to a complex

The element has positive and negative complexes (26, 30) including electrodes (31A, 31B, 33A, 33B), where the complexes are superimposed. Electrically insulating separators (28A, 28B), made of porous plastic material, are interposed between the complexes. One of the separators is connected to the adjacent complex or with an element connected to the adjacent complex by bonding a melted plastic material in vicinity of an end of the separator according to a preset direction normal to superposition direction (D). An independent claim is also included for a method for manufacturing a capacitive element.