Patent ID: 7780066

Claim:
A method for manufacturing a power capacitor comprising at least one capacitor element, wherein the capacitor element comprises a roll of alternate dielectric films and electrode films, wherein the roll has first and second end surfaces, facing away from each other, in which said electrode films are connectably exposed, the method comprising: preheating a solder tip in a solder pot with a preheated pre-solder, wherein the pre-solder is a solder material, wherein the solder tip is arranged on a shaft, whereby the shaft is journalled in a bearing housing which permits relative axial movement, automatically coating the solder tip with pre-solder in the solder pot through capillary forces, coating at least one of the end surfaces of the capacitor element with the pre-solder by bringing the coated solder tip into contact with said at least one end surface of the capacitor element, wherein the solder tip when first being brought into contact with the end of the capacitor element presses down the end surface of the capacitor element, wherein the depth into which the solder tip is pressed down is determined by the total weight of the solder tip and the shaft and by the friction in the bearing housing, and wherein the solder tip is pressed down to a depth of between 0 and 6 mm in the end surface of the capacitor element, moving the solder tip along the at least one end surface of the capacitor element, ceasing the contact between the solder tip and said at least one end surface of the capacitor element, and fixing at least one lead to said pre-solder by soldering the at least one lead to said pre-solder on said at least one end surface of the capacitor element with another solder material, wherein at least the pre-soldering of the at least one end surface of the capacitor element is automated.