| US 7,468,222 B2 | ||
| Electrochemical device | ||
| Tetsuya Takahashi, Tokyo (Japan); Masayuki Ohtsuka, Tokyo (Japan); Kunio Miyabara, Tokyo (Japan); Saburou Tsuchida, Tokyo (Japan); and Mitsuyoshi Harano, Tokyo (Japan) | ||
| Assigned to TDK Corporation, Tokyo (Japan) | ||
| Filed on Dec. 21, 2004, as Appl. No. 11/16,719. | ||
| Claims priority of application No. P2003-434002 (JP), filed on Dec. 26, 2003. | ||
| Prior Publication US 2005/0147880 A1, Jul. 07, 2005 | ||
| Int. Cl. H01M 2/04 (2006.01); H01M 2/08 (2006.01); H01M 4/64 (2006.01); H01G 9/10 (2006.01) | ||
| U.S. Cl. 429—177 [429/162; 429/185; 429/233; 361/518] | 14 Claims |
| 1. An electrochemical device comprising:
a matrix including first and second electrodes;
an electrolyte; and
a shell for accommodating the matrix and the electrolyte in a closed state,
wherein the shell includes first and second lids made of a metal opposing each other, and a gasket placed between the first
and second lids;
wherein the first and second lids and the gasket are arranged so as to define a space for accommodating the matrix;
wherein at least one of the first and second lids is formed with a projection protruding toward the matrix so that the first
lid and the first electrode electrically come into contact with each other and that the second lid and the second electrode
electrically come into contact with each other, and the projection has a leading end part that is a flat part, at least one
of the first and second lids contacts the matrix only at the leading end part of the projection formed on the one of the first
and second lids;
wherein the electrochemical device is formed by a placing step of placing the matrix within the shell;
wherein the matrix, the gasket, and the first and second lids used in the placing step simultaneously satisfy conditions represented
by the following expressions (1) and (2):
T2>T1 (1), and
T3>(T2−T1) (2)
where T1 is the thickness of the matrix, T2 is the thickness of the gasket, and T3 is the total height of the projection formed at the first lid and/or the second lid; and
wherein the electrochemical device is rectangular.
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