Long-Life Capacitors

Abstract

A capacitor manufacturing method described herein includes a process for the isolation of edges of electrode foils in an electrolytic capacitor after slitting the electrode foils from a mother foil. For example, a coating process may be incorporated into the capacitor manufacturing so that the edges of the electrode foils may undergo isolation with a deposition of a layer of epoxy or resin. A manufacturing machine that incorporates a resin coating process may be positioned in the manufacturing line, such that the edges of the slit electrode foils undergo a deposition of a coating of an electrical isolator, such as a polymer, an epoxy, a resin, a ceramic, and/or an oxide layer. As another example, a combined foil with interleaving conducting bands and isolating strips may also be used to form the electrode foils with isolated edges.

1 . An electrolytic capacitor comprising an electrode foil, wherein the electrode foil comprises at least one edge covered by an isolating material. 
     
     
         2 . The electrolytic capacitor of  claim 1 , wherein the electrode foil is configured as an anode. 
     
     
         3 . The electrolytic capacitor of  claim 1 , wherein the electrode foil is configured as a cathode. 
     
     
         4 . The electrolytic capacitor of  claim 1 , wherein the electrode foil comprises aluminum. 
     
     
         5 . The electrolytic capacitor of  claim 1 , wherein the isolating material is an electrically isolating material. 
     
     
         6 . The electrolytic capacitor of  claim 1 , wherein the isolating material is a chemically isolating material. 
     
     
         7 . The electrolytic capacitor of  claim 1 , wherein the isolating material is an electrically and chemically isolating material. 
     
     
         8 . A method of manufacturing for an electrolytic capacitor, comprising:
 slitting an electrode foil after forming;   coating at least one edge of the electrode foil exposed by the slitting with an isolating material; and   manufacturing the electrolytic capacitor using the edge-isolate electrode foil.   
     
     
         9 . The method of  claim 8 , wherein the electrode foil is configured as an anode. 
     
     
         10 . The method of  claim 8 , wherein the electrode foil is configured as a cathode. 
     
     
         11 . The method of  claim 8 , wherein the isolating material is an electrically isolating material. 
     
     
         12 . The method of  claim 8 , wherein the isolating material is a chemically isolating material. 
     
     
         13 . The method of  claim 8 , wherein the isolating material is an electrically and chemically isolating material. 
     
     
         14 . A composite electrode foil for manufacturing an electrolytic capacitor, wherein the composite electrode foil comprises alternating strips of an electrode foil and an isolating material, wherein the alternating strips are positioned along a width of the composite electrode foil at locations corresponding to a length of an inner cavity of a case of the electrolytic capacitor. 
     
     
         15 . The composite electrode foil of  claim 14 , wherein e electrode foil is configured as an anode. 
     
     
         16 . The composite electrode foil of  claim 14 , wherein the electrode foil is configured as a cathode. 
     
     
         17 . The composite electrode foil of  claim 14 , wherein the electrode foil comprises aluminum. 
     
     
         18 . The composite electrode foil of  claim 14 , wherein the isolating material is an electrically isolating material. 
     
     
         19 . The composite electrode foil of  claim 14 , wherein the isolating material is a chemically isolating material. 
     
     
         20 . The composite electrode foil of  claim 14 , wherein the isolating material is an electrically and chemically isolating material.