The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 2006
Filed:
Dec. 19, 2002
Hironori Marubayashi, Sumoto, JP;
Takuma Morishita, Sumoto, JP;
Yoshihiro Tobita, Hyogo, JP;
Shigeki Fujii, Hyogo, JP;
Hironori Marubayashi, Sumoto, JP;
Takuma Morishita, Sumoto, JP;
Yoshihiro Tobita, Hyogo, JP;
Shigeki Fujii, Hyogo, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A cell according to the present invention comprises a positive electrode, a negative electrode, an electrolyte solution, and an outer casing, wherein the outer casing comprises a valve platehaving a thickness, an annular-shaped break grooveformed on the valve plate, and one or more of break aiding groovesin the inner area of the break groove, and wherein the break aiding groove comprises such configurations that remaining thickness of the valve plate at the break aiding groove is thicker than remaining thickness of the valve plate at the break groove, and at least one end of the break aiding groove is connected with the break groove. In a cell provided with a valve plate which is a safety valvecomprising the break groove and the break aiding groove, the safety valve operates smoothly and releases a gas inside the cell quickly, and resistance to dropping impact is improved.