Chemistry: electrical current producing apparatus – product – and – Plural concentric or single coiled electrode
Reexamination Certificate
2001-04-24
2004-06-01
Chaney, Carol (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Plural concentric or single coiled electrode
C429S053000, C429S178000, C429S180000
Reexamination Certificate
active
06743544
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electric energy storage device, more particularly, to a capacitor of which internal electric resistance between electrodes and their terminals is greatly reduced by increasing the contact area between the electrodes and terminals using irregular interfaces.
2. Discussion of Related Art
Supplied electric energy is stored in an electric energy storage device. And, the storage device such as a battery, an electrolyte condenser, a double-layered electric condenser or the like supplies an external load with the stored electric energy for operation. When the stored electric energy is applied by the electric energy storage device to the external load, the amount of the supplied electric energy greatly depends on their own internal resistance.
FIG. 1A
shows a bird's-eye view of stacked electrodes of an electric energy storage device such as a capacitor according to a related art, and
FIG. 1B
shows a bird's-eye view of a cylindrical electric energy storage device by rolling the device in
FIG. 1A
for illustrating the stacked and rolled electrodes.
FIG. 2A
shows a bird's-eye view of stacked electrodes of an electric energy storage device having a plurality of terminals according to a related art, and
FIG. 2B
shows a bird's-eye view of a cylindrical electric energy storage device by rolling the device in
FIG. 2A
for illustrating the stacked and rolled electrodes.
Referring to
FIG. 1A
, an electrode body
110
includes a film type anode electrode
100
, a film type cathode electrode
102
, an anode terminal
104
connected to the anode electrode
100
, and a cathode terminal
106
connected to the cathode electrode
102
. And, the film type anode electrode
100
and the film type cathode electrode
102
are stacked and isolated each other by an insulating film(not shown in the drawing).
The anode and cathode electrodes
100
and
102
are formed with films to store electrons. The insulating layer inserted between the electrodes
100
and
102
isolates the anode electrode
100
from the cathode electrode
102
. The anode terminal
104
is connected to the anode electrode
100
by welding or riveting, and the cathode terminal
106
is also connected to the cathode electrode
102
by the same method.
Referring to
FIG. 1B
, a cylindrical electric energy storage device
110
is attained by rolling up the electrode body
110
having the above structure.
The anode and cathode terminals
104
and
106
attached to the anode and cathode electrodes
100
and
102
protrude out of the electrode body
100
so as to transfer the electric energy to the external load.
Another electric energy storage device having a pair of terminals connected to a plurality of corresponding lead wires according to a related art will be explained by referring to FIG.
2
A and
FIG. 2B
so as to reduce the internal electric resistance generated between terminals and relatively-long electrodes.
Referring to
FIG. 2A
, an electrode body
208
includes a film type anode electrode
200
, a film type cathode electrode
202
stacked on the anode electrode
200
, an insulating film(not shown in the drawing) inserted between the anode and cathode electrodes
200
and
202
, a first to a third lead wire
204
a
,
204
b
, and
204
c
connected to the anode electrode
200
by welding or riveting with constant intervals apart, and a first to a third cathode lead wire
206
a
,
206
b
, and
206
c
connected to the cathode electrode
202
by welding or riveting with constant intervals apart. Namely, the first to third anode and cathode lead wires
204
a
,
204
b
,
204
c
,
206
a
,
206
b
, and
206
c
are separated from one another with predetermined intervals apart.
A cylindrical electric energy storage device is provided by rolling up the electrode body
208
as shown in FIG.
2
B.
Referring to
FIG. 2B
, the first to third anode lead wires
204
a
,
204
b
, and
204
c
are coupled by welding all in one. Then, the welded first to third anode lead wires are connected to an anode terminal
210
by welding.
The first to third cathode lead wires
206
a
,
206
b
, and
206
c
are coupled by welding all in one. Then, the welded first to third cathode lead wires are connected to a cathode terminal
212
by welding.
Therefore, the first to third anode and cathode lead wires
204
a
/
204
b
/
204
c
, and
206
a
/
206
b
/
206
c
are connected to the anode and cathode terminals
210
and
212
, respectively.
On the other hand, the first to third anode and cathode lead wires
204
a
,
204
b
,
204
c
,
206
a
,
206
b
, and
206
c
can be connected to the corresponding terminals
210
and
212
respectively by rivet joint as well.
FIG. 3
shows a bird's-eye view of a regular polygon type electric energy storage devide according to a related art for illustrating terminal connections.
Referring to
FIG. 3
, a plurality of rectangular film type anode electrodes
300
and cathode electrodes
302
are stacked alternatively, and a plurality of insulating films(not shown in the drawing) are inserted between the anode and cathode films
300
and
302
, respectively. A plurality of anode and cathode lead wires
308
and
310
are formed by extending predetermined ends of the anode and cathode electrodes
300
and
302
so as to huddle up in different corners to be coupled with an anode terminal
304
and a cathode terminal, respectively. Namely, the lead wires
308
and
310
to be connected to the corresponding terminals may be built in bodies of the electrodes
300
and
302
.
In the above-structures electric energy storage device, the anode and cathode lead wires
308
and
310
of the anode and cathode electrodes
300
and
302
are connected to the anode and cathode terminals
304
and
306
by welding or riveting.
Methods of connecting a plurality of cells in an electric energy storage device by jointing anode and/or cathode terminals according to the related art will be explained as follows by referring to FIG.
4
and FIG.
5
.
FIG. 4
shows a schematic view of an electric energy storage device using a multi-cell method according to a related art, and
FIG. 5
shows a schematic view of an electric energy storage device using a bipolar method according to a related art.
Referring to
FIG. 4
, anode and cathode terminals + and − of a plurality of electrode bodies
400
-
1
,
400
-
2
,
400
-
3
, . . . in an electric energy storage device are connected in series using lead wires
402
or plate type conductors
402
.
Referring to
FIG. 5
, anode electrodes
500
are separated from cathode electrodes
502
by insulating layers
504
so as to connect in series a plurality of stacked electrode bodies in an electric energy storage device.
Unfortunately, the electric energy storage device according to the related art, as shown in
FIG. 1
a
and
FIG. 1
b
, when the anode and cathode electrodes are connected by welding or riveting a singe anode terminal and a single cathode terminal, fails to reduce electric resistance generated between the electrodes and terminals because the resistance is proportional to length and inverse proportional to the contact area.
And, in the electric energy storage device according to the related art, as shown in
FIG. 2
a
,
FIG. 2
b
and
FIG. 3
, a plurality of lead wires are connected to the anode and cathode electrodes of the electrode body to increase the contact area between the electrode body and the anode and cathode terminals by welding. And, the lead wires are again connected to the anode and cathode terminals by welding or riveting.
Thus, the electric energy storage device according to the related art may somewhat reduce the electric resistance between the electrodes and terminals due to the reduced electrode length of each terminal. Yet, the related art requires more complicated fabrication method, thereby decreasing productivity.
Moreover, the electric energy storage device according to the related art has to connect the terminals to the lead wires one by one or stack the electr
Jung Yong Ho
Kim Sun Wook
Kim Sung Min
Avruch Philip G.
Chaney Carol
Ness Capacitor Co., Ltd.
Rabin & Berdo PC
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