Copper encased flat electrolytic capacitor manufacture and capacitor

• US 4,267,565 A
• Filed: 04/02/1979
• Issued: 05/12/1981
• Est. Priority Date: 04/02/1979
• Status: Expired due to Term

• Current Assignee: Sprague Electric Company
• Original Assignee: Sprague Electric Company
• Inventors: Puppolo, Henry F., Markarian, Mark
• Primary Examiner(s): JAMES, ANDREW
• Application Number:
  US06/026,467
• Time in Patent Office: 771 Days
• Field of Search: 361/433, 361/271, 361/272, 357/72, 357/74, 29/570
• US Class Current: 361/530
• CPC Class Codes: H01G 9/08 Housing; Encapsulation

Abstract

A copper-encased flat electrolytic capacitor is produced by sealing the capacitor unit in a heat-sealable polymer-copper laminate. The polymer side of the laminate is adjacent the capacitor section, and the copper side forms the exterior of the sealed unit. Leads may be attached to opposite surfaces of the capacitor, or electrical connection may be made prior to sealing, e.g., to leg-like extensions of the laminate that, after sealing, serve as the leads.

Claims

1. A copper-encased sealed flat capacitor comprising a flat impregnated capacitor section with associated spacers and electrode tabs, said section being housed between two layers of an insulating heat-sealable polymer-copper laminate, the polymer portion of both of said layers being adjacent said section and sealed together around the periphery thereof, one of said electrode tabs contacting the copper portion of one of said layers and the other of said electrode tabs contacting the copper portion of the other of said layers.

2. A capacitor according to claim 1 wherein said section comprises an anodized anode foil with said associated electrode tab located with a fold of spacer located within a folded cathode foil with its associated electrode tab.

3. A capacitor according to claim 1 wherein each of said electrode tabs extends through said periphery and is bent opposite to the other into contact with the respective copper surface.

4. A capacitor according to claim 3 wherein leads are attached to said respective copper surfaces.

5. A capacitor according to claim 1 wherein each of said laminates has a leg-like extension to which the anode and cathode tabs are electrically connected, said extensions being heat-sealed with the rest of the unit forming integral terminals thereof.

6. A capacitor according to claim 1 wherein the polymer portion of the laminate is chosen from the group of heat-sealable polyester, polyolefin, perfluoroethylene, cellophane, and the copper portion of the laminate is chosen from the group of electrotinplated copper and copper-clad aluminum.

7. A capacitor according to claim 1 wherein said laminate is chosen from the group of polyethylene-electrotinplated-copper, polyethylene-aluminum foil-polyethylene-copper clad aluminum, and polyethylene-polyester-polyethylene-electrotinned copper laminate.