Chemistry: electrical current producing apparatus – product – and – Plural concentric or single coiled electrode
Reexamination Certificate
2000-08-15
2002-10-08
Ryan, Patrick (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Plural concentric or single coiled electrode
C429S163000, C429S164000, C429S176000, C429S178000, C429S186000
Reexamination Certificate
active
06461760
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a non-aqueous electrolyte secondary battery and particularly, to a structure of the non-aqueous electrolyte secondary battery having a rolled body therein.
2. Description of the Prior Art
In order to derive a large electric current from a non-aqueous electrolyte secondary battery, it is necessary to reduce an inner resistance due to electric leads. Therefore, it is also necessary to connect a plurality of electric leads with a rolled body to derive an electric current therefrom. In addition, in order to draw out these electric leads, it is necessary to define a gap between the rolled body and the bottom of a case and another gap between the rolled body and a header.
However, in a conventional non-aqueous electrolyte secondary battery, a structure as shown in
FIG. 4
which is disclosed in JPA 9-259857 is popular. Referring to
FIG. 4
, although recess
204
is formed on the upper side of case
201
, the purpose of forming recess
204
is not to hold rolled body
200
but to have recess
204
function as a receiver of a stress caused when caulking case
201
with header
203
to seal case
201
.
In the conventional non-aqueous electrolyte secondary battery, rolled body
200
is merely enclosed in case
201
, and there are free spaces over and under rolled body
200
. Therefore, rolled body
200
may move freely inside case
201
. Thus, when using the conventional non-aqueous electrolyte secondary battery, a relative position of rolled body
200
with respect to case
201
varies by vibration, and stresses are applied to both terminals of a plurality of negative electrode leads (not shown) connecting a lower terminal of rolled body
200
with a bottom of case
201
and terminals of a plurality of positive electrode leads (not shown) connection an upper terminal of rolled body
200
with header
203
, resulting in that at least parts of these leads are disconnected and an inner resistance due to leads increases. In addition, when parts of positive electrode leads are disconnected, the disconnected leads contact with case
201
, resulting in short circuit.
SUMMARY OF THE INVENTION
In order to overcome the aforementioned disadvantages, the present invention has been made and accordingly, has an object to provide a non-aqueous electrolyte secondary battery in which a rolled body does not relatively move with respect to a case.
According to an aspect of the present invention, there is provided a non-aqueous electrolyte secondary battery which comprises: a case comprising a bottom and a sidewall; a rolled body comprising: a positive electrode comprised of a first electric plate and a positive electrode active material applied on the first electric plate; a negative electrode comprised of a second electric plate and a negative electrode active material applied on the second electric plate; and a separator inserted between the positive electrode and the negative electrode; wherein the rolled body is formed by laminating and rolling the positive electrode, the negative electrode, and the separator; and the rolled body is enclosed in the body; non-aqueous electrolyte enclosed in the case; a header used for sealing the case; a plurality of positive electrode leads connecting the positive electrode with the header; a plurality of negative electrode leads connecting the negative electrode with a bottom of the case; and holding means for holding the rolled body so that the rolled body does not relatively move with respect to the case while keeping a gap between a lower terminal of the rolled body and the bottom of the case and a gap between an upper terminal of the rolled body and the header.
In the non-aqueous electrolyte secondary battery, the holding means may comprise: a first recess at least partially formed in the neighborhood of an upper end of the sidewall of the case; and a second recess at least partially formed in the neighborhood of a lower end of the sidewall of the case;
wherein the first recess and the second recess hold the rolled body.
In the non-aqueous electrolyte secondary battery, the holding means may comprise: a first recess at least partially formed in the neighborhood of an upper end of the sidewall of the case; and a short-diameter portion formed in the neighborhood of a lower end of the sidewall of the case; wherein the first recess and a shoulder of the short-diameter portion hold the rolled body.
In the non-aqueous electrolyte secondary battery, the holding means may comprise: a first recess at least partially formed in the neighborhood of an upper end of the sidewall of the case; and a spacer disposed between the bottom of the case and the lower terminal of the rolled body; wherein the first recess and the spacer hold the rolled body.
The non-aqueous electrolyte secondary battery may further comprise: a spacer disposed between the first recess and the rolled body.
The non-aqueous electrolyte secondary battery may further comprise: an insulator disposed between the rolled body and the holding means.
These and other objects, features and advantages of the present invention will become more apparent in the light of the following detailed description of the best mode embodiments thereof, as illustrated in the accompanying drawings.
REFERENCES:
patent: 5916707 (1999-06-01), Omaru et al.
patent: 2001/0007729 (2001-07-01), Kitoh et al.
patent: 0 486 950 (1992-05-01), None
patent: 0 622 862 (1994-11-01), None
patent: 0 895 297 (1999-02-01), None
patent: 09259857 (1997-10-01), None
patent: 09259866 (1997-10-01), None
patent: 09283178 (1997-10-01), None
Hayes & Soloway P.C.
Martin Angela J
NEC Tokin Corporation
Ryan Patrick
LandOfFree
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