Capacitors with low equivalent series resistance

• US 7,864,507 B2
• Filed: 09/05/2007
• Issued: 01/04/2011
• Est. Priority Date: 09/06/2006
• Status: Expired due to Fees

• Current Assignee: TPL Incorporated
• Original Assignee: TPL Incorporated
• Inventors: Lakeman, Charles D. E., Fuge, Mark, Fleig, Patrick Franz
• Primary Examiner(s): Ha; Nguyen T
• Application Number:
  US11/850,633
• Publication Number:
  US 20090168305A1
• Time in Patent Office: 1,217 Days
• Field of Search: 361/502, 361503-504, 361508-512, 361516-519, 361523-529
• US Class Current: 361/502
• CPC Class Codes: H01G 11/16 against electric overloads, e.g. including fuses
• CPC Class Codes: H01G 11/22 Electrodes
• CPC Class Codes: H01G 11/26 characterised by their structure, e.g. multi-layered, porosity or surface features
• CPC Class Codes: H01G 11/58 Liquid electrolytes
• CPC Class Codes: H01G 11/74 Terminals, e.g. extensions of current collectors
• CPC Class Codes: H01G 11/86 specially adapted for electrodes carbonisation or activation of carbon for the manufacture of electrodes H01G11/34
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

An electric double layer capacitor (EDLC) in a coin or button cell configuration having low equivalent series resistance (ESR). The capacitor comprises mesh or other porous metal that is attached via conducting adhesive to one or both the current collectors. The mesh is embedded into the surface of the adjacent electrode, thereby reducing the interfacial resistance between the electrode and the current collector, thus reducing the ESR of the capacitor.

Claims

1. A coin cell capacitor comprising:

two current collectors configured to form a coin cell capacitor;

a porous electrode; and

a porous metal disc in electrical contact with one of said current collectors and at least partially embedded in a surface of said electrode;

wherein during manufacture said electrode was sufficiently locally deformable to be imprinted by a surface pattern of said disc.

2. The coin cell capacitor of claim 1 wherein said porous metal disc comprises expanded mesh.

3. The coin cell capacitor of claim 1 wherein at least one of said current collectors is at least partially coated with a conductive material.

4. The coin cell capacitor of claim 3 wherein said conductive material comprises aluminum.

5. The coin cell capacitor of claim 1 wherein said porous metal disc is coated with a conducting adhesive.

6. The coin cell capacitor of claim 1 wherein said electrode comprises carbon powder.

7. The coin cell capacitor of claim 1 wherein said electrode comprises an aerogel.

8. A device for storing and delivering power to a load, the device comprising a battery and the coin cell capacitor of claim 1 for charging said battery and delivering power to said load.

9. The device of claim 8 further comprising a charge switching module.

10. The device of claim 8 wherein said battery charges said capacitor.