Exposed conductive core battery

Details Exposed conductive core battery Exposed conductive core battery

1998-07-31

2001-01-30

Nuzzolillo, Maria (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S233000, C429S242000, C429S060000

Reexamination Certificate

active

06180285

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a battery having a wound electrode, and more particularly to an organic electrolyte cell.
BACKGROUND OF THE INVENTION
Hitherto, as organic electrolyte cells having wound electrodes, for example, lithium graphite-fluoride cells and lithium manganesedioxide cells have been known. The organic electrolyte cells have excellent discharge characteristics and storage properties, and are hence widely used in applications momentarily requiring a large current such as a camera and a strobe, applications of long-term use such as memory back-up, and others. Recently, as these appliances are enhanced in performance, the organic electrolyte cells are also required to be further enhanced in discharge capacity.
In these cells, foils of an alkaline metal such as lithium or its alloy are used as negative electrodes. A conductive metal is used as the active material for the negative electrode. Accordingly, except for a lead-like current collector to be welded to the can, a conductive core not relating to the discharge reaction is not needed. Instead, the filling amount of the active material can be increased by a corresponding portion. However, if a difference in speed occurs in the discharge reaction due to non-uniformity of the partial active material amount or an imbalance of pressure applied to electrode plates, part of the negative electrode may be extremely consumed, and the electric connection between the current collector and the active material of negative electrode may be lost. As a result, at the end of discharge, due to a decrease in the reaction area of the negative electrode, a sudden drop of discharge voltage occurs. In particular, this discharge voltage drop is notable in the case of low current discharge.
The invention hence solves the problem of localized consumption of the organic electrolyte cell as described in the prior art, suppresses the voltage drop at the end of cell discharge, and presents an organic electrolyte cell of high performance having an excellent discharge capacity.
SUMMARY OF THE INVENTION
The cell of the present invention comprises an electrolyte, a negative electrode, and a positive electrode including a conductive core and an active material disposed so as to cover the core, in which at least part of the core is exposed from the active material at a position confronting the negative electrode.
Preferably, the core is at least one metal selected from a porous metal plate and a metal mesh, and the width of the narrowest part of the metal is larger than the thickness of the negative electrode.
Preferably, one side of the core is exposed.
In this constitution, the discharge reaction is delayed in the exposed portion of the core of the positive electrode. By this delay of the discharge reaction, electric connection of the negative electrode is maintained up to the end of discharge. Accordingly, voltage drop at the end of discharge is suppressed. As a result, a battery having an excellent discharge capacity up to the end of discharge is obtained.


REFERENCES:
patent: 5458993 (1995-10-01), Terao et al.
patent: 5965290 (1999-10-01), Shimizu et al.

Affiliated with

Also associated with

Rating

Exposed conductive core battery does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exposed conductive core battery, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposed conductive core battery will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2460581