| US 7,576,969 B2 | ||
| Coin-shaped storage cell | ||
| Masayuki Sato, Osaka (Japan); Masashige Ashizaki, Osaka (Japan); Koichi Morikawa, Kyoto (Japan); Isamu Nishiyama, Osaka (Japan); Nario Niibo, Osaka (Japan); and Masayuki Taniguchi, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/581,339 PCT Filed Dec. 02, 2004, PCT No. PCT/JP2004/017960 § 371(c)(1), (2), (4) Date Jun. 02, 2006, PCT Pub. No. WO2005/055259, PCT Pub. Date Jun. 16, 2005. |
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| Claims priority of application No. 2003-404161 (JP), filed on Dec. 03, 2003; application No. 2004-007686 (JP), filed on Jan. 15, 2004; and application No. 2004-147429 (JP), filed on May 18, 2004. | ||
| Prior Publication US 2007/0109721 A1, May 17, 2007 | ||
| Int. Cl. H01G 9/00 (2006.01) | ||
| U.S. Cl. 361—502 [361/503; 361/504; 361/512; 361/536; 361/537] | 18 Claims |
| 14. A coin-shaped storage cell comprising:
a pair of polarizable electrodes;
an insulating separator which is interposed between the polarizable electrodes;
an electrolytic solution which is impregnated in the polarizable electrode pair and the separator;
a metal case for housing the polarizable electrode pair;
an insulating ring packing which is disposed inside the metal case;
a top lid which is integrally caulked with the metal case via the ring packing; and
a first annular bulging portion which is integrally formed with an outer periphery of the metal case, the first annular bulging
portion protruding toward the ring packing;
wherein the metal case includes an inner bottom surface formed with asperities.
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