Heat dissipation aluminum electrolytic capacitor

• US 4,546,415 A
• Filed: 03/27/1984
• Issued: 10/08/1985
• Est. Priority Date: 12/10/1981
• Status: Expired due to Term

• Current Assignee: BC Components Holding BV, BC Components Holdings B.V.
• Original Assignee: North American Philips Corp. (Koninklijke Philips N.V.)
• Inventors: Shaffer, Jesse S., Kent, Thomas A.
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Lee, Douglas S.
• Application Number:
  US06/593,226
• Time in Patent Office: 560 Days
• Field of Search: 361/433, 29/570
• US Class Current: 361/511
• CPC Class Codes: H01G 9/00 Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture

Abstract

An aluminum electrolytic capacitor having improved axial heat dissipation resulting from a smaller ratio between the width of the anode foil and the diameter of the capacitor foil roll.

Claims

1. An electrolytic capacitor having a capacitor foil roll of interleaved anode foil, spacer and cathode foil which capacitor roll is snuggly accommodated in a housing enclosed by means of a cover, said anode foil and said cathode foil being electrically connected to the corresponding terminals in said cover, characterized in that:

said capacitor foil roll has a ratio of anode foil width to foil roll diameter of 1 to 2 or greater;

the cathode foil layer of said capacitor foil roll extending below said anode foil and said spacer, the lower edges of said cathode foil engaging and being force fitted against the base of said housing for the conduction of heat from said foil to the base of said housing;

a circumferential compressible pad positioned between the cover of said housing and the top of said foil roll to maintain downward pressure on said foil roll; and

the diameter of said foil roll being increased and the height of said foil roll being decreased within said ratio to provide optimal axial heat dissipation for a given capacitance and power level.