Electric double layer capacitor and aggregation thereof

• US 7,589,955 B2
• Filed: 11/14/2006
• Issued: 09/15/2009
• Est. Priority Date: 11/16/2005
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Yanagisawa, Hiroyuki, Kuriyama, Chojiro
• Primary Examiner(s): THOMAS, ERIC W
• Application Number:
  US11/559,715
• Publication Number:
  US 20070109723A1
• Time in Patent Office: 1,036 Days
• Field of Search: 361/502, 361/503
• US Class Current: 361/502
• CPC Class Codes: H01G 11/10 Multiple hybrid or EDL capacitors, e.g. arrays or modules housings, cases, encapsulations or mountings thereof H01G11/78
• CPC Class Codes: H01G 11/12 Stacked hybrid or EDL capacitors
• 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 11/32 Carbon-based
• CPC Class Codes: H01G 11/74 Terminals, e.g. extensions of current collectors
• CPC Class Codes: H01G 11/84 Processes for the manufacture of hybrid or EDL capacitors, or components thereof
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

An electric double layer capacitor includes an anode, a cathode, and an electrolytic solution provided between the anode and the cathode. The anode may be a niobium porous sintered body with an oxide film formed as a dielectric layer on a surface thereof. The cathode allows an electric double layer at an interface with the electrolytic solution. The electric double layer capacitor has a large capacitance and increased voltage.

Claims

1. An electric double layer capacitor comprising:

a pair of electrodes each including a carbon layer and arranged opposite to each other;

a partition wall separating the pair of electrodes from each other;

a pair of external electrodes each conductively connected to the pair of electrodes; and

an electrolytic solution provided between the pair of electrodes;

wherein

the carbon layer is about 6 μ

m or less in thickness; and

a high-resistance portion is arranged between at least one of the pair of electrodes and the external electrodes conductive thereto and is smaller in cross-sectional area than the at least one electrode and the external electrodes.

2. The electric double layer capacitor according to claim 1, wherein a thickness in a direction in which the pair of electrodes and the partition wall are layered is about 1,000 μ

m or less.

3. The electric double layer capacitor according to claim 1, wherein a withstand voltage of the electric double layer capacitor is about 1.2V or more.

4. The electric double layer capacitor according to claim 1, wherein an operating temperature limit of the electric double layer capacitor is about 100°

C. or more.

5. The electric double layer capacitor according to claim 1, wherein the high-resistance portion includes wires.

6. An aggregation of electric double layer capacitors, comprising a plurality of electric double layer capacitors according to claim 1.

7. The aggregation of electric double layer capacitors according to claim 6, wherein the plurality of electric double layer capacitors are connected to one another in series.

8. The aggregation of electric double layer capacitors according to claim 6, wherein the plurality of electric double layer capacitors are connected to one another in parallel.

9. An electric double layer capacitor comprising:

a pair of electrodes each including a carbon layer and arranged opposite to each other;

a partition wall separating the pair of electrodes from each other;

a pair of external electrodes each conductively connected to the pair of electrodes; and

an electrolytic solution provided between the pair of electrodes;

wherein

a thickness of the electric double layer capacitor in a direction in which the pair of electrodes and the partition wall are layered is about 1/50 or less of a width thereof in a direction that is substantially perpendicular to the direction of the layering; and

a high-resistance portion is arranged between at least one of the pair of electrodes and the external electrodes conductive thereto and is smaller in cross-sectional area than the at least one electrode and the external electrodes.

10. The electric double layer capacitor according to claim 9, wherein a withstand voltage of the electric double layer capacitor is about 1.2V or more.

11. The electric double layer capacitor according to claim 9, wherein an operating temperature limit of the electric double layer capacitor is about 100°

C. or more.

12. The electric double layer capacitor according to claim 9, wherein the high-resistance portion includes wires.

13. An aggregation of electric double layer capacitors, comprising a plurality of electric double layer capacitors according to claim 9.

14. The aggregation of electric double layer capacitors according to claim 13, wherein the plurality of electric double layer capacitors are connected to one another in series.

15. The aggregation of electric double layer capacitors according to claim 13, wherein the plurality of electric double layer capacitors are connected to one another in parallel.

16. An electric double layer capacitor comprising:

a pair of electrodes each including a carbon layer and arranged opposite to each other;

a partition wall separating the pair of electrodes from each other;

a pair of external electrodes each conductively connected to the pair of electrodes; and

an electrolytic solution provided between the pair of electrodes;

wherein

the electric double layer capacitor is flexible and can bend at an angle of from about 15 degrees to about 45 degrees; and

a high-resistance portion is arranged between at least one of the pair of electrodes and the external electrodes conductive thereto and is smaller in cross-sectional area than the at least one electrode and the external electrodes.

17. The electric double layer capacitor according to claim 16, wherein a withstand voltage of the electric double layer capacitor is about 1.2V or more.

18. The electric double layer capacitor according to claim 16, wherein an operating temperature limit of the electric double layer capacitor is about 100°

C. or more.

19. The electric double layer capacitor according to claim 16, wherein the high-resistance portion includes wires.

20. An aggregation of electric double layer capacitors, comprising a plurality of electric double layer capacitors according to claim 16.

21. The aggregation of electric double layer capacitors according to claim 20, wherein the plurality of electric double layer capacitors are connected to one another in series.

22. The aggregation of electric double layer capacitors according to claim 20, wherein the plurality of electric double layer capacitors are connected to one another in parallel.