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Method for interconnecting anodes and cathodes in a flat capacitor
| Details |
Inventors: O'Phelan, Michael J.; Krautkramer, Michael; Sherwood, Gregory J.; Barr, A. Gordon;
Assignee: Cardiac Pacemakers, Inc. (St. Paul, MN)
Primary Examiner: Nelms; David
Assistant Examiner: Vu; David
Attorney, Agent or Firm: Schwegman, Lundberg, Woessner & Kluth, P.A.
In one aspect, a method of interconnecting two or more foils of a capacitor, the method comprising connecting together one or more anode connection members of one or more anode foils and one or more cathode connection members of one or more cathode foils and electrically isolating the one or more anode foils from the one or more cathode foils. In one aspect, a capacitor having a first anode layer, a second anode layer, a cathode layer between the first anode layer and the second anode layer, a first separator layer between the first anode layer and the cathode layer, a second separator layer between the second anode layer and the cathode layer; and a conductive interconnect between the first anode layer and the second anode layer, the conductive interconnect passing through a cathode hole in the cathode; wherein the conductive interconnect has a cross section which is smaller than the cathode hole and the conductive interconnect is placed to avoid direct electrical contact with the cathode layer and wherein the first anode and the second anode are electrically connected through the conductive interconnect. |
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DETAILED DESCRIPTION The following detailed description, which references and incorporates the figures, describes and illustrates one or more specific embodiments of the invention.
These embodiments, offered not to limit but only to exemplify and teach the invention, are shown and described in sufficient detail to enable those skilled in the art to practice the invention.
Thus, where appropriate to avoid obscuring the invention, the description may omit certain information known to those of skill in the art.
FIG.
1 shows a flat capacitor 100 constructed according to one embodiment of the present invention.
Although capacitor 100 is a D-shaped capacitor, in other embodiments, the capacitor is another desirable shape, including, but not limited to rectangular, circular, oval or other symmetrical or asymmetrical shape.
Capacitor 100 includes a case 101 which contains a capacitor stack 102.
In the exemplary embodiment, case 101 is manufactured from a conductive material, such as aluminum.
In other embodiments, the case is manufactured using a nonconductive material, such as a ceramic or a plastic.
Capacitor 100 includes a first terminal 103 and a second terminal 104 for connecting capacitor stack 102 to an outside electrical component, such as heart monitor circuitry, including defibrillator, cardioverter, and pacemaker circuitry.
In the exemplary embodiment, terminal 103 is a feedthrough terminal insulated from case 101, while terminal 104 is directly connected to case 101.
In other embodiments, the capacitor incorporates other connection methods, depending on other design factors.
For instance, in some embodiments, capacitor 100 includes two or more feedthrough terminals 103.
Capacitor stack 102 includes capacitor elements 105a, 105b, 105c, .
.
.
, 105n, with each capacitor element 105a-105n including one or more cathodes, anodes, and separators.
Each cathode is a foil structure and can include aluminum, tantalum, hafnium, niobium, titanium, zirconium, and combinations of these metals.
In one embodiment, each cathode of capacitor stack 102 is connected to the other cathodes by welding or other connection methods which will be discussed below
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Metal Working 
