Patent · US Expired

Ni/metal hydride accumulator

US5500309A · kind A · utility

9Cited by

5References

9Claims

0Family size

Assignee

Varta Batterie Aktiengesellschaft · DE

Inventors

Frank Lichtenberg · Adliswil, CH
Klaus Kleinsorgen · Kelkheim, DE
Gunter A. Hofmann · San Diego, US

Key dates

Filing date	Nov 30, 1994
Grant date	Mar 19, 1996
Priority date	—
Expiry date	Nov 30, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E60/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The positive electrode of a Ni/metal hydride accumulator is formed from a mass mixture of Ni(OH).sub.2 and an oxidation-resistant graphite. The stable graphite is notable for a high degree of crystallinity and a low ash content. In conventional Ni/metal hydride accumulators, cobalt compounds play an essential part in developing a conductive matrix within their positive nickel hydroxide electrodes, leading to reductive destruction of the matrix by severe high temperature short circuit testing. In contrast, the same accumulators, with positive electrodes produced according to the present invention, survive the test with only a temporary and slight decline in capacity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.