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Implantable medical device having flat electrolytic capacitor formed with nonthrough-etched and through-hole punctured anode sheets
| Details |
Inventors: Yan, Jenn-Feng; Untereker, Darrel F.; Crespi, Ann M.;
Assignee: Medtronic, Inc. (Minneapolis, MN)
Primary Examiner: Nguyen; Ha Tran
Assistant Examiner:
Attorney, Agent or Firm: Wolde-Michael; Girma
Implantable medical devices (IMDs) and their various components, including flat electrolytic capacitors for same, and methods of making and using same, particularly an improved electrolytic capacitor with optimized ESR and anode layer surface area. An electrode stack assembly and electrolyte are located within the interior case chamber of a hermetically sealed capacitor case. The electrode stack assembly comprises a plurality of capacitor layers stacked in registration upon one another, each capacitor layer comprising a cathode layer having a cathode tab, an anode sub-assembly comprising at least one anode layer having an anode tab, and a separator layer located between adjacent anode and cathode layers, whereby all adjacent cathode layers and anode layers of the stack are electrically insulated from one another by a separator layer. Anode terminal means extend through the capacitor case side wall for electrically connecting a plurality of the anode tabs to one another and providing an anode connection terminal at the exterior of the case. Cathode terminal means extend through or to an encapsulation area of the capacitor case side wall for electrically connecting a plurality of the cathode tabs to one another and providing a cathode connection terminal at the exterior of the case. A connector assembly is electrically attached to the anode connection terminal for making electrical connection with the anode tabs and to the cathode connection terminal for making electrical connection with the cathode tabs. The anode layers are formed of one or more nonthrough-etched anode sheet bearing an oxide layer and formed with a plurality of punctures therethrough. |
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DETAILED DESCRIPTION The present invention provides for anode layers of electrolytic capacitors that minimize ESR and maximize surface area wherein such capacitors are formed of one or a plurality of stacked capacitor layers each having anode layers formed of one or a plurality of nonthrough-etched and through-hole punctured anode sheets.
This invention provides paths for electrolyte transfer by forming small through-holes through nonthrough-etched anodes in order that the ESR is reduced and there are more paths for the ions to migrate.
The number and size of these through-holes are chosen to reduce the ESR to a minimum while not unnecessarily reducing surface area.
In general a minimal number and size of through-hole will be chosen so that the finished capacitor still meets the application requirements.
The through-holes need not be round, but that is a convenient shape to use.
In one embodiment employing multiple anode sheets sandwiched together forming an anode layer, the innermost anode sheet is nonthrough etched and not punctured to form a barrier to ion migration or communication through the innermost anode sheet, whereas the outer anode sheets are punctured to enable ion migration and electrolyte distribution to all anode sheet surfaces.
In one embodiment, an exemplary electrolytic capacitor formed in accordance with the present invention comprises an electrode stack assembly and electrolyte located within the interior case chamber of a hermetically sealed capacitor case.
The electrode stack assembly comprises a plurality of capacitor layers stacked in registration upon one another, each capacitor layer comprising a cathode layer having a cathode tab, an anode layer comprising at least one anode layer having an anode tab, and a separator layer located between adjacent anode and cathode layers, whereby all adjacent cathode layers and anode sheets of the stack are electrically insulated from one another by a separator layer.
Anode terminal means extend through the capacitor case side wall for electrically connecting a plurality of the anode tabs to one another and providing an anode connection terminal at the exterior of the case
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