Metal working – Method of mechanical manufacture – Electrical device making
Patent
1998-04-09
1999-10-26
Nuzzolillo, Maria
Metal working
Method of mechanical manufacture
Electrical device making
429217, H01M 404
Patent
active
059720565
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to electrical engineering industry, in particular to the manufacture of nickel-cadmium, nickel-hydride, and other alkaline accumulators and can be used in the production of primary current generator cells.
BACKGROUND ART
There has been known a process for manufacturing a battery electrode, comprising the steps of mixing active material with a binder, applying the mixture so obtained to a current collector and drying (see Japanese patent application No. 17545/71, C1. 57C2, 1971).
One of the major drawbacks of said process is its limitation in utilizing more efficient methods of applying the active material to the current collector, with the exception of a method for smearing. This is caused by the fact that, when using these methods of applying active materials to a collector, namely milling and pressing, which allow preparation of electrodes with higher capacities per unit weight, a wet mixture of active materials will be squeezed out. In addition to the above problem, when drying an active material of a smeared electrode, warping is unavoidable so that an additional process for milling becomes necessary to straighten said electrode. Drying requires a complete hardening of a binder. As a result, the destruction of the electrode skeleton structure takes place when the binder polymerizes during rolling and drying. The destruction results in the decrease of electrode strength and flexibility. The destruction also disturbs the contact between separate particles of active materials, leading to the decrease of capacity of such electrodes.
The closest prior art dealing with processes for making electrodes of the same purpose has been described in a method for manufacturing a battery electrode, comprising the steps of mixing an active material with a binder, applying a mixture so obtained to the lead, and drying (see French Patent No.2415882, Int. C1. HO1M 4/32, 1979).
It is, however, impossible to use the above method during one main stage (rolling and pressing), to obtain an electrode with predetermined weight characteristics due to an intense creep of the paste. When applying the paste onto a current collector using the said method, additional means (porous bands, cords, etc.) for dehydrating and keeping clear of the paste to operating parts are required, resulting in considerable complication of the manufacturing process.
Moreover, electrodes made by the said method using a tentative binder possess a limited flexibility which narrows the spectrum of applicability of, for example, small-scale cylindrical primary current generator cells due to the cracking of electrodes while coiling.
SUMMARY OF THE PRESENT INVENTION
The present invention is made in order to solve the above problems in the prior arts, and an object of this invention is to provide a new method of manufacturing a battery electrode which, as compared to previously known methods for the same purpose, allows simplification of the manufacturing process and improvement in mechanical strength of the electrode.
An achievement of the present invention is the simplification of battery electrode manufacturing process by reducing the number of equipments required to implement the process. Another achievement is the separation of the drying stage from the direct manufacturing of a finished electrode. One result of these achievements is that drying itself does not predetermine a direct manufacture time and the active materials with a given end moisture content that does not affect electrochemical and gravimetric characteristics of the electrode allow flexible use of the aforementioned time. Another result of the present is the improvement in mechanical strength of the electrodes due to the decrease in its brittleness and tendency to crack while coiling for small-scale cylindrical primary current generator cells.
The present invention provides a method of manufacturing a battery electrode, comprising the steps of mixing an active material with a binder, drying the mixture so that it contains a residual moistu
REFERENCES:
patent: 3954506 (1976-05-01), Sullivan
patent: 4297420 (1981-10-01), Chenaux et al.
patent: 5262255 (1993-11-01), Ito et al.
patent: 5595841 (1997-01-01), Suzuki
patent: 5639100 (1997-06-01), Yoshino et al.
Masanori, "Flat Plate Type Battery", Patent Abstracts of Japan, vol. 11, No. 88 (E-490), Mar. 18, 1987.
Masayuki, "Manufacture Of Cadmium Negative Plate For Alkaline Storage Batter", Patent Abstracts of Japan, vol. 10, No. 268, Sep. 12, 1986.
Aktsionernoe Obschestvo Zakrytogo Tipa "Elit"
Aktsionernoe Obschestvo Zakrytogo Tipa "Esma"
Chaney Carol
Nuzzolillo Maria
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