Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
1998-09-02
2001-07-31
Weiner, Laura (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S223000, C429S247000
Reexamination Certificate
active
06268083
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improvement of alkaline storage batteries, particularly to an improvement of the structure of electrode assemblies suited for high electric current discharge at low temperature.
2. Description of Related Art
In recent years, with the strong trend toward lighter-weight and smaller-sized electric appliances, there has been an increasing demand for small-sized high capacity batteries as the power source therefor. Also in alkaline storage batteries, which are batteries with high reliability, in line with the above-mentioned trend, efforts have been made to increase the capacity of nickel-cadmium storage batteries or to develop and improve nickel-metal hydride storage batteries which use as the negative electrode hydrogen absorbing alloys having a high energy density. The alkaline storage batteries of this kind have a great advantage in that since the electrolyte thereof is an alkaline electrolyte of aqueous solution type, they can be charged and discharged at large electric currents.
These batteries are generally prepared by constructing a positive electrode plate and a negative electrode plate, with a separator interposed therebetween, into a spirally coiled electrode assembly, then welding current collectors to the respective end planes of the positive electrode plate and the negative electrode plate, housing the whole in a battery case, and then pouring a predetermined amount of an aqueous alkaline solution as the electrolyte into the case.
Previous nickel-metal hydride storage batteries, as compared with nickel-cadmium storage batteries, show a marked decrease of their discharge capacity when discharged at high electric currents, particularly at low temperatures.
BRIEF SUMMARY OF THE INVENTION
The main object of the present invention is to provide an alkaline storage battery excellent in high-rate discharge characteristics at low temperatures by suppressing the decrease of the negative electrode reactivity at low temperatures, particularly by suppressing the increase of the electrode resistance.
To solve the above-mentioned problems, the present invention provides an alkaline storage battery which comprises a positive electrode comprising as the main constituent material a metal oxide, preferably nickel hydroxide, a negative electrode comprising a hydrogen absorbing alloy, an alkaline electrolyte and a separator wherein the negative electrode has a capacity per unit area of 10-40 mAh/cm
2
.
REFERENCES:
patent: 5032475 (1991-07-01), Hasebe et al.
patent: 5695530 (1997-12-01), Hong et al.
patent: 5773163 (1998-06-01), Suzuki et al.
patent: 6042753 (2000-03-01), Izumi et al.
patent: 2215057 (1990-08-01), None
Hattori Yohei
Iida Takuma
Ohnishi Masato
Yoshii Fumihiko
Matsushita Electric - Industrial Co., Ltd.
Stevens Davis Miller & Mosher LLP
Weiner Laura
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