Patent ID: 6724610
Filing Date: 2004-04-20
Classification: H01G

Abstract:
A capacitor element (1) for a power capacitor comprising a first foil (3) of metal material and a second foil (5) of metal material arranged to form a pair of electrodes, and also film (2a, 2b, 4a, 4b) of dielectric material arranged between the foils (3, 5) in order to form a dielectric medium, which capacitor element (1) is produced by said foils (3, 5) and films (2a, 2b, 4a, 4b) being arranged one on top of the other and wound to a roll, the capacitor element (1) displaying a first end surface (12) where the second foil (5) has a long edge (10) indented between two of said films (2a, 4b) situated adjacent to the second foil (5), and also a second and surface (13) where the first foil (3) has a long edge (9) indented between two of said films (2b, 4a) situated adjacent to the first foil (3), each of which indented long edge (9, 10) has an edge portion (15; 16) surrounded by an elongate field equalizer (18; 19) of dielectric material surrounding the edge portion (15, 16), characterized in that the field equalizer (18, 19) is in the form of an elongate strip having a thickness within the interval 5-10 &mgr;m which is folded around the indented long edge (9, 10) and surrounds the latter and which extends axially though the capacitor element (1).