Electrolyte capacitor and method of making the same

• US 5,628,801 A
• Filed: 05/02/1994
• Issued: 05/13/1997
• Est. Priority Date: 05/02/1994
• Status: Expired due to Term

• Current Assignee: Telectronics Pacing Systems, Inc (Abbott Laboratories)
• Original Assignee: Specialised Conductives Pty Limited
• Inventors: Lunsmann, Paul D., MacFarlane, Douglas R.
• Primary Examiner(s): FOURSON III, GEORGE R
• Application Number:
  US08/235,179
• Time in Patent Office: 1,107 Days
• Field of Search: 29/25.03, 361/525, 361/526
• US Class Current: 29/25.03
• CPC Class Codes: H01G 9/151 with wound foil electrodes

Abstract

A substantially flat electrolytic capacitor capable of retaining several joules of energy has anode and cathodes held together by a solid or elastomeric solid adhesive which is also the electrolyte within the capacitor.

Claims

1. A method for construction of a substantially flat, low volume, high capacity storage device suitable for use in a cardiac defibrillator or pacemaker comprising an electrolytic capacitor having a gel or solid electrolyte, without a separate adhesive to maintain the spatial relation between the capacitor anode and cathode comprising

preparing an etched anode by shaping a deeply etched anode foil to a planar configuration,

de-oxygenating the anode and cathode,

impregnating said etched anode with a polymerizable liquid electrolyte adapted to form an adhesive when polymerized,

employing press means to maintain a planar cathode layer in contact with said liquid electrolyte, passing an electric current through said anode and cathode to form an oxide dielectric layer on said anode,

polymerizing said liquid electrolyte, and removing said press means, wherein said capacitor anode and cathode are adhered by the polymerized electrolyte.

2. The method of claim 1, wherein said polymerized electrolyte comprises a metal salt in a polymer matrix.

3. The method of claim 1, wherein said electrolyte comprises hydroxyethylmethacrylate, ethylene glycol, ammonium adipate, ammonium glutarate and tetraethyleneglycol diacrylate.

4. The method of claim 1, wherein said electrolyte comprises 17.5 parts of hydroxyethylmethacrylate, 32.5 parts ethylene glycol, 7.0 parts ammonium adipate, 6.7 parts ammonium glutarate and 0.45 parts tetraethyleneglycol diacrylate.