Electric energy storage device electrode including an overcurrent protector

• US 8,725,252 B2
• Filed: 12/15/2010
• Issued: 05/13/2014
• Est. Priority Date: 12/18/2009
• Status: Active Grant

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Sherwood, Gregory J.
• Primary Examiner(s): Schaetzle, Kennedy
• Application Number:
  US12/968,584
• Publication Number:
  US 20110152961A1
• Time in Patent Office: 1,245 Days
• Field of Search: 361/534
• US Class Current: 607/5
• CPC Class Codes: A61N 1/3931 Protecting, e.g. back-up systems
• CPC Class Codes: A61N 1/3975 Power supply A61N1/378 takes precedence
• CPC Class Codes: H01G 9/0003 Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films H01G9/12 takes precedence
• CPC Class Codes: H01G 9/012 specially adapted for solid capacitors
• CPC Class Codes: H01G 9/052 Sintered electrodes
• CPC Class Codes: H01G 9/08 Housing; Encapsulation

Abstract

One embodiment includes a capacitor case sealed to retain electrolyte, at least one electrode disposed in the capacitor case, the at least one electrode comprising an overcurrent protector, a conductor coupled to the overcurrent protector and in electrical communication with a remainder of the electrode, the conductor sealingly extending through the capacitor case to a terminal disposed on an exterior of the capacitor case, a second electrode disposed in the capacitor case, a separator disposed between the electrode and the second electrode and a second terminal disposed on the exterior of the capacitor case and in electrical communication with the second electrode, with the terminal and the second terminal electrically isolated from one another, wherein the overcurrent protector is to interrupt electrical communication between the terminal and the remainder of the electrode at a selected current level.

Claims

1. An apparatus, comprising:

a capacitor case sealed to retain electrolyte;

at least one electrode disposed in the capacitor case, the at least one electrode comprising an overcurrent protector formed from a portion of the electrode, wherein the at least one electrode comprises a sheet with a main body comprising a sintered portion, and a connection member extending away from the main body, the connection member comprising the overcurrent protector;

a conductor coupled to the overcurrent protector and in electrical communication with remainder of the electrode, the conductor sealingly extending through the capacitor case to a terminal disposed on an exterior of the capacitor case;

a second electrode disposed in the capacitor case;

a separator disposed between the electrode and the second electrode; and

a second terminal disposed on the exterior of the capacitor case and in electrical communication with the second electrode, with the terminal and the second terminal electrically isolated from one another,

wherein the overcurrent protector is to interrupt electrical communication between the terminal and the remainder of the electrode at a selected current level.

2. The apparatus of claim 1, wherein the overcurrent protector includes the sintered portion.

3. The apparatus of claim 1, wherein the sintered portion is disposed on a foil substrate, and the overcurrent protector comprises a portion of the foil substrate that is substantially free of sintered material.

4. The apparatus of claim 1, wherein the overcurrent protector is selected to conduct a defibrillator pulse.

5. The apparatus of claim 1, wherein the overcurrent protector is selected to interrupt electrical communication to the electrode after the overcurrent protector exceeds a threshold temperature for a predetermined period of time.

6. The apparatus of claim 1, wherein the overcurrent protector comprises another sintered portion disposed on the connection member.

7. The apparatus of claim 6, wherein the at least one electrode is resistance welded to the overcurrent protector.

8. The apparatus of claim 1, wherein the overcurrent protector comprises one or more holes termed in the connection member.

9. A system, comprising:

a hermetically seated device housing;

a battery disposed in the hermetically sealed device housing;

a capacitor disposed in the hermetically seated device housing, the capacitor comprising;

a capacitor case sealed to retain electrolyte;

at least one electrode disposed in the capacitor case, the at least one electrode comprising an overcurrent protector formed from a portion of the electrode, wherein the at least one electrode comprises a sheet with a main body comprising a sintered portion, and a connection member extending away from the main body, the connection member comprising the overcurrent protector;

a conductor coupled to the overcurrent protector and in electrical communication with a remainder of the electrode, the conductor sealingly extending through the capacitor case to a terminal disposed on an exterior of the capacitor case;

a second electrode disposed in the capacitor case;

a separator disposed between the electrode and the second electrode; and

a second terminal disposed on the exterior of the capacitor case and in electrical communication with the second electrode, with the terminal and the second terminal electrically isolated from one another,

wherein the overcurrent protector is to interrupt electrical communication between the terminal and the remainder of the electrode at a selected current level, and

an electronic cardiac rhythm management circuit coupled to the battery and the capacitor and adapted to charge the capacitor with the battery and to discharge the capacitor to provide a therapeutic defibrillation pulse.

10. The system of claim 9, wherein at least two electrodes including the at least one electrode and the second electrode are stacked against one another and abutting one another.

11. The system of claim 9, wherein the case includes a dish portion and lid portion, with the overcurrent protector fixed to the dish portion.

12. The system of claim 9, wherein the electronic cardiac rhythm management circuit comprises a defibrillator circuit.

13. The system of claim 12, wherein the at least one electrode is part of an anode, and the second electrode is part of a cathode, and the defibrillator circuit is to entirely discharge the anode and the cathode to provide a single therapeutically effective defibrillator pulse.

14. The system of claim 13, wherein the anode and the cathode are sized to deliver a defibrillation pulse of approximately 50 joules.

15. The system of claim 13, wherein the anode and the cathode are sized and packaged to deliver a defibrillation pulse of approximately 50 joules.

16. The system of claim 9, wherein the sintered portion is disposed on a foil substrate, and the overcurrent protector comprises a portion of the foil substrate that is substantially free of sintered material.

17. The system of claim 9, wherein the overcurrent protector comprises one or more holes formed in the connection member.

18. A method of constructing a capacitor, comprising:

forming a first electrode including a connection member;

forming an overcurrent protector from the connection member;

stacking a separator onto the first electrode;

stacking a second electrode onto the separator;

disposing the first electrode, the separator, the second electrode and overcurrent protector into a capacitor case;

electrically coupling the overcurrent protector to a first terminal disposed on an exterior of the capacitor case;

electrically coupling the second electrode to a second terminal disposed on the exterior of the capacitor case, the second terminal electrically isolated from the first terminal;

filling the capacitor case with an electrolyte;

sealing the electrolyte in the capacitor case; and

forming the first electrode by sintering material onto a foil substrate, and forming the overcurrent protector out of the foil substrate.

19. The method of claim 18, wherein forming the overcurrent protector includes excising the foil substrate.