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:
Mar. 13, 2001
Filed:
Nov. 27, 1998
Hirotaka Hayashida, Fujisawa, JP;
Hiroshi Kitayama, Fujisawa, JP;
Masaaki Yamamoto, Inzai, JP;
Shusuke Inada, Yokohama, JP;
Isao Sakai, Yokohama, JP;
Tatsuoki Kono, Kawasaki, JP;
Hideki Yoshida, Yokohama, JP;
Takamichi Inaba, Yokohama, JP;
Motoya Kanda, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A nickel-hydrogen secondary battery having a negative electrode comprising a hydrogen-absorbing alloy containing magnesium, a rare earth element and nickel as essential elements, which is capable of suppressing the self-discharge being occurred under the condition of high temperature storage, or the like. This secondary battery comprises a negative electrode containing a hydrogen-absorbing alloy, a positive electrode containing nickel hydroxide, a separator comprising a non-woven fabric, and an alkaline electrolyte. The hydrogen-absorbing alloy is represented by (R,Mg,)Ni,A,(wherein R is at least one element selected from rare earth elements (including yttrium), Ca, Zr and Ti, A is at least one element selected from Co, Mn, Fe, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P and B), and x, y and z are atomic ratio individually defined as 0<x<1, 0≦z≦1.5, 2.5≦y+z<4.5). The ratio between the weight of the hydrogen-absorbing alloy per unit area of the negative electrode (M,(mg/cm,)) and the weight per unit area of the separator (M,(g/m,)) meets the condition of M,/M,≦6.