Claims
- 1. An electric double layer capacitor having an outer packaging can containing therein an electrode rolled body obtained by interposing a separator between a pair of a positive electrode plate having a positive electrode foil, on both sides of which an active substance is applied, and a negative electrode plate having a negative electrode foil, on both sides of which the active substance is applied, and winding them, characterized in that the negative electrode foil is electrically connected directly to a bottom of the outer packaging can, and the negative electrode foil has a greater thickness than that of the positive electrode foil, which is not electrically connected to the outer packaging can.
- 2. The electric double layer capacitor according to claim 1, wherein the bottom of the outer packaging can includes a plurality of convex ridges formed to extend inside thereof and radially toward an outer periphery thereof from a central portion thereof.
- 3. The electric double layer capacitor according to claim 2, wherein each of a plurality of the convex ridges is tapered to be increased in height toward an outer periphery thereof from a central portion thereof.
Priority Claims (3)
Number |
Date |
Country |
Kind |
11-235810 |
Aug 1999 |
JP |
|
11-237540 |
Aug 1999 |
JP |
|
11-237548 |
Aug 1999 |
JP |
|
Parent Case Info
This application is a divisional of application Ser. No. 09/643,975, filed Aug. 22, 2002 now U.S. Pat. No. 6,456,484, which application(s) are incorporated herein by reference.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4546415 |
Kent et al. |
Oct 1985 |
A |
5579203 |
Klaschka |
Nov 1996 |
A |
Foreign Referenced Citations (1)
Number |
Date |
Country |
10294101 |
Nov 1998 |
JP |