Description
BATTERY HAVING ENHANCED ELECTRICAL INSULATION
CAPABILITY
Technical Field
[ 1 ] The present invention relates to a battery having enhanced electrical insulation ca-
pability, and more particularly, to a battery wherein an insulator tape is attached to the
boundary of a cathode active-material coating layer at a position where an anode
active-material coating layer faces a cathode uncoated part where no cathode active-
material coating layer is present, achieving enhanced electrical insulation capability
and consequential safety of the battery.
[2]
Background Art
[3 ] Conventionally, differently from a primary battery having no charge ability, a
rechargeable secondary battery having charge and discharge characteristics is actively
under study with the development of advanced technologies including digital cameras,
cellular phones, laptop computers, hybrid cars, etc. Examples of the secondary battery
include a nickel-cadmium battery, nickel-metal hydride battery, nickel-hydrogen
battery, a lithium secondary battery, etc.
[4] Of the above-mentioned secondary batteries, a lithium secondary battery has a
driving voltage of 3.6V or more. The lithium secondary battery may be utilized as a
power source for portable electronic appliances, or may be utilized in high-power
hybrid cars when a plurality of lithium secondary batteries are connected in series.
Since the lithium secondary battery has a higher driving voltage three times that of the
nickel-cadmium battery or nickel-metal hydride battery and also, has superior energy
density per unit weight, the use of the lithium secondary battery is rapidly increasing.
[5] At present, a lithium ion battery has been fabricated, wherein a cathode and an
anode, which are insulated by a separator interposed therebetween, are wound into a
cylindrical or prismatic electrode assembly, and after the resulting electrode assembly
is inserted into a metal can, an electrolyte is injected into the metal can. As the metal
can is sealed, the fabrication of the lithium ion battery is completed.
[6] More particularly, a conventional lithium ion battery includes a cathode in which a
cathode active-material coating layer is provided on one surface or both surfaces of a
cathode collector, and an anode in which an anode active-material coating layer is
provided on one surface or both surfaces of an anode collector, the cathode and anode

being wound with a plurality of separators interposed therebetween.
[7] In the case where active-material coating layers are provided on both surfaces of an
electrode collector, the active-material coating layer provided on one surface of the
electrode collector is generally shorter than the active-material coating layer provided
on the other surface of the electrode collector. Typically, it is desirable that a length
and width of an anode be longer than a length and width of a cathode, to prevent ex-
traction of lithium ions from the cathode.
[8] Recently, a battery has been developed, which is changed in configuration such that
active-material coating layers applied to both surfaces of a cathode collector are longi-
tudinally deviated from each other, causing a part of one active-material coating layer
so as not to be included in the other active-material coating layer.
[9] FIG. 1 is a sectional view of a conventional battery having the above-described con-
figuration, and FIG. 2 illustrates a "jelly-roll" configuration of the wound battery. Con-
sidering the configuration of the conventional battery in detail with reference to the
drawings, the battery includes a cathode in which cathode active-material coating
layers 20a and 20b are provided on at least one surface of a cathode collector 10, an
anode in which anode active-material coating layers 43a and 4)b are provided on at
least one surface of an anode collector 30, and a plurality of separators 50a and 50b in-
terposed between the cathode and the anode. At least one of a winding beginning
portion and winding ending portion of the cathode collector 10 or anode collector 30
contains a cathode uncoated part 10' or anode uncoated part 30' where no electrode
active-material coating layer is present. These uncoated parts 10' and 30' are provided
with electrode leads 60 and 70 to be connected to exterior terminals. Both the electrode
leads, i.e. cathode lead 60 and anode lead 70 are arranged in the same direction.
[TO] When the cathode active-material coating layer 20a comes into contact with the
anode with the separator interposed therebetween, the cathode active-material coating
layer 20a must overlap the facing anode active-material coating layer 4)b (in other
words, must have a smaller area than that of the anode active-material coating layer
40b). in consideration of a winding deviation and positional change caused upon
charge and discharge of the battery. Under this condition, the boundary between the
cathode active-material coating layer and the cathode uncoated part 10' comes across
the anode active-material coating layer 40b. This causes occurrence of micro-holes or
shrinkage and damages to other functions of the facing separator 50, resulting in sig-
nificant heat emission upon contact between the anode active-material coating layer
43b and the cathode uncoated part 10'.

[11] As shown in FIG. 1, the cathode lead 60 faces the anode uncoated part 30' with the
separator 50b interposed therebetween and thus, there is a risk of short circuit between
the cathode lead 60 and the anode uncoated part 30' (see region A).
[12] Further, as shown in FIG. 1. since the anode active-material coating layer 40a
provided at an upper surface of the anode collector 30 (see region B) faces the
boundary of the cathode active-material coating layer 20b (see region C) with the
separator 50a interposed therebetween, and the anode active-material coating layer 40b
provided at a lower surface of the anode collector 30 faces the boundary of the cathode
active-material coating layer 20a (see the region B) with the separator 50b interposed
therebetween, there is also a risk of short circuit. Meanwhile, when the anode and
cathode active-material coating layer come into contact with each other under the oc-
currence of short circuit, there exist a negligible short circuit current and heat emission
because of a high electric resistance of the cathode active-material coating layer.
However, when the anode comes into contact with the cathode uncoated part (i.e. a
part of the cathode collector where no cathode active-material coating layer is present),
an insufficient electric resistance causes a serious short circuit current and heat
emission which act as dangerous factors significantly deteriorating safety of the
battery.
[13] To solve the stove-described problems, conventionally, a method for providing an
insulator in facing region between the cathode uncoated part and the anode has been
adopted.
[14] FIG. 3 illustrates a configuration wherein insulators 90a, 90b, 90c and 90d are
provided in the conventional battery shown in FIG. 1. Referring to FIG. 3 together
with FIGS. 1 and 2, the anode lead 70 is attached to the anode uncoated part 30' of the
anode collector 30 where the anode active-material coating layers 4)a and 40b are not
present, and the anode lead 70 faces the cathode with seven layers of separators 50 in-
terposed therebetween. Provision of the sufficient number of separators 50 eliminates a
necessity for an insulator around the anode lead 70 facing the separators 50. Fur-
thermore, a protective tape 80a is provided at an opposite side of the anode lead 70,
eliminating a necessity for an insulator.
[15] Note that a distal end of the winding ending portion of the anode faces, in either
direction, the cathode with only one layer of the separator interposed therebetween and
therefore, an insulator must be provided therebetween.
[16] Also, the cathode lead 60 is attached to one side of the cathode uncoated part 10' in
the winding beginning portion of the cathode collector 10 where the cathode active-

material coating layers 20a and 20b are not present, and although not shown in the
drawing, the cathode lead 60 faces another cathode with four layers of separators 50
interposed therebetween, eliminating a necessity for an insulator. However, the other
side of the cathode collector 10 opposite to the cathode lead 60 faces the anode with
only one layer of separator 50 interposed therebetween, having a necessity for an
insulator.
[17] Note that both a beginning portion and ending portion of the cathode active-material
coating layer face the anode with only one layer of the separator interposed
therebetween and therefore, it is necessary to provide an insulator therebetween.
[18]
Disclosure of Invention
Technical Problem
[19] Therefore, the present invention has been made to solve several problems of a battery
having a cathode wherein active-material coating layers applied to both surfaces of a
cathode collector are longitudinally deviated from each other, causing a part of one
active-material coating layer so as not to be included in the other active-material
coating layer, and in particular, to prevent short circuit caused between an electrode
uncoated part where no active-material coating layer is present and a facing electrode.
[20] To prevent short circuit between electrodes and consequential deterioration in
electrical insulation capability, the present invention proposes that a cathode lead and
anode lead are arranged in opposite directions, rather than being arranged in the same
direction, and that an insulator tape is additionally attached to the boundary of a
cathode active-material coating layer at a position where an anode active-material
coating layer faces a cathode uncoated part where no cathode active-material coating
layer is present.
[21] Accordingly, it is an object of the present invention to provide a battery having
enhanced electrical insulation capability.
[22]
Technical Solution
[23] In accordance with the present invention, the above and other objects can be ac-
complished by the provision of a battery including: a cathode having a cathode active-
material coating layer provided on at least one surface of a cathode collector; and an
anode having an anode active-material coating layer provided on at least one surface of
an anode collector, the cathode and anode being wound to face each other with a

separator interposed therebetween, wherein the cathode active-material coating layer
applied to the at least one surface of the cathode collector is longitudinally deviated
from a cathode active-material coating layer applied to the other surface of the cathode
collector such that application beginning and ending portions of bom the cathode
active-material coating layers are not consistent with each other, and only at least one
of a winding beginning portion and winding ending portion of the cathode is provided
with a cathode uncoated part for installation of a cathode lead, and wherein an
insulator tape is attached to the boundary of the cathode active-material coating layer
at a position where the anode active-material coating layer faces a non-coating part of
the cathode not containing the cathode active-material coating layer.
[24]
Advantageous Effects
[25] In the case of a battery designed such that active-material coating layers applied to
both surfaces of a cathode collector are longitudinally deviated from each other,
causing a part of one active-material coating layer so as not to be included in the other
active-material coating layer, an insulator tape is attached to the boundary of the
cathode active-material coating layer at a position where an anode active-material
coating layer faces a cathode uncoated part where no cathode active-material coating
layer is present, achieving enhanced electrical insulation capability and safety of the
battery.
[26]
Brief Description of the Drawings
[27] The above and other objects, features, and other advantages of the present invention
will be more clearly understood from the following detailed description taken in con-
junction with the accompanying drawings, in which:
[28] FIG. 1 is a sectional view illustrating a configuration of a conventional battery;
[29] FIG. 2 is a view illustrating a jelly-roll configuration of the wound battery;
[30] FIG. 3 is a view illustrating a configuration wherein insulators are provided in the
battery shown in FIG. 1;
[31 ] FIG. 4 is a view illustrating a configuration of a battery according to the present
invention;
[32] FIGS. 5 and 6 are views illustrating a configuration of a battery and a jelly-roll con-
figuration of the wound battery according to a first embodiment of the present
invention;

[33] FIGS. 7 and 8 are views illustrating a configuration of a battery and a jelly-roll con-
figuration of the wound battery according to a second embodiment of the present
invention;
[34] FIGS. 9 and 10 are views illustrating a configuration of a battery and a jelly-roll con-
figuration of the wound battery according to a third embodiment of the present
invention; and
[35] FIGS. 11 and 12 are views illustrating a configuration of a battery and a jelly-roll
configuration of the wound battery according to a fourth embodiment of the present
invention.
[36]
Best Mode for Carrying Out the Invention
[37] Hereinafter, the present invention will be described in more detail with reference to
the accompanying drawings.
[38] Referring to FIG. 4 illustrating an electrode configuration according to the present
invention, an electrode, more particularly, a cathode is configured in such a manner
that cathode active-material coating layers 120a and 120b are applied to both upper
and lower surfaces of a cathode collector 110, respectively, and the cathode active-
material coating layers 120a and 120b are longitudinally deviated from each other,
causing a part of one cathode active-material coating layers 120a or 120b so as not to
be included in the other cathode active-material coating layer 120b or 120a. In
addition, at least one of distal ends of a winding beginning portion and winding ending
portion of the cathode collector 110 has no cathode uncoated part (in the drawing, the
arrow indicates a winding direction), and only the other end of the cathode collector
110 defines a cathode uncoated part 110' for installation of an electrode lead (i.e.
cathode lead) 160 to be connected to an exterior terminal.
[39] In the cathode according to the present invention, since both the cathode active-
material coating layers 120a and 120b are longitudinally deviated from each other,
with respect to a region where a part of one cathode active-material coating layer is not
included in the other cathode active-material coating layer, the cathode active-material
coating layer is provided at only one surface of the cathode collector 110, and the other
surface of the cathode collector 110 defines a non-coating part containing no cathode
active-material coating layer.
[40] The cathode having the above-described configuration is arranged to face an anode
with a separator 150 interposed therebetween, and the anode is configured such that
anode active-material coating layers 140a and 140b are applied to both upper and

lower surfaces of an anode collector 130, respectively. At least one of distal ends of a
winding beginning portion and winding ending portion of the anode collector 130
defines an anode uncoated part 130' where the anode active-material coating layers
140a and 140b are not present. An electrode lead (i.e. anode lead) 170 to be connected
to an exterior terminal is connected to the anode uncoated part 130'.
[41] In the present invention, the cathode lead 160 and anode lead 170 are arranged in
opposite directions, rather than being arranged in the same direction. As known, in-
stallation of an electrode lead requires an electron uncoated part where no electrode
active-material is coated. Thus, when the cathode lead and anode lead are arranged in
the same direction as described with relation to the conventional battery, a cathode
uncoated part and anode uncoated part must be arranged in the same direction, causing
the above-described several problems including short circuit. To solve these problems,
in accordance with the present invention, both the cathode lead and the anode lead are
arranged in opposite directions, and at least one side of the cathode is not provided
with the cathode uncoated part.
[42] In the present invention, as shown in the several drawings, an ending portion of the
separator is positioned to extend lengthwise beyond the winding ending portion of the
anode. This arrangement can prevent short circuit between the electrodes even if the
separators 150a and 150b undergo heat shrinkage. Preferably, the ending portion of the
separator extends from the winding ending portion of the anode by a length of at least
5mm or more. In addition, a beginning portion of the separator may be wound in a
conventional jelly-roll winding manner, but is not particularly limited thereto.
[43] In the above-described configuration of the present invention, with respect to the
winding beginning portion of the anode collector 130, the anode active-material
coating layer 140a provided at the upper surface of the anode collector 130 comes into
indirect contact with the boundary of the cathode active-material coating layer 120b in
region B with the separator 150a interposed therebetween. In this case, an insulator
tape 190c is attached to the boundary of the cathode active-material coating layer
120b, so as to prevent a non-coating part where the cathode active-material coating
layer 120b is not present from coming into contact with the anode active-material
coating layer 140a. Also, the anode active-material coating layer 140b provided at the
lower surface of the anode collector 130 faces the cathode active-material coating layer
120a in region A with the separator 150b interposed therebetween, rather than coming
into indirect contact with a non-coating part where the cathode active-material coating
layer 120a is not present.

[44] In addition, with respect to the winding ending portion of the anode collector 130,
the anode active-material coating layer 14)a provided at the upper surface of the anode
collector 130 comes into indirect contact with the boundary of the cathode active-
material coating layer 120b in region D with the separator 150a interposed
therebetween. In this case, an insulator tape 190a is attached to the boundary of the
cathode active-material coating layer 120b. so as to prevent the cathode uncoated part
110' where the cathode active-material coating layers 120a and 120b are not present
from coming into contact with the anode active-material coating layer 140a. The anode
active-material coating layer 143b provided at the lower surface of the anode collector
130 comes into indirect contact with the boundary of the cathode active-material
coating layer 120a in region C with the separator 150b interposed therebetween. An
insulator tape 190b is attached to the boundary of the cathode active-material coating
layer 120a, preventing the anode active-material coating layer 140b from coming into
contact with the cathode uncoated part where the cathode active-material coating
layers 120a and 120b are not present.
[45] The insulator tape 190c also serves to come into contact with a cut-face of the anode
uncoated part 130' at a tip end of the anode, preventing short circuit that may be caused
by sharp burrs present at the cut face of the anode uncoated part 130'. Similarly, the
insulator tapes 190a and 190b cover burrs present at a cut-face of the anode uncoated
part 130' provided at a distal end of the anode, preventing short circuit with the cathode
collector 110.
[46] In the present invention, additionally, an insulator film 180a for insulation of the
anode lead 170 is provided at the rear side of the anode lead 170, to face the insulator
tape 190c. Accordingly, the insulator film 180a may be omitted for the purpose of
designing a battery having a more simplified configuration.
[47] In the present invention, the cathode lead 160 is located at a distal end of the winding
ending portion. Upon winding, although a cathode region F containing the cathode
lead 160 comes into contact with a cathode region E (more particularly, an upper
surface of the region E), contact between these cathode regions reduces a risk of short
circuit due to tap edge transfer.
[48] Hereinafter, exemplary embodiments of the present invention will be described in
more detail with reference to the accompanying drawings. Of course, it will be ap-
preciated that the present invention is not limited to these embodiments.
[49] FIGS. 5 and 6 are, respectively, a sectional view of a battery according to a first em-
bodiment of the present invention, and a view illustrating a jelly-roll configuration of

the wound battery. Referring to FIGS. 5 and 6. the battery includes a cathode in which
cathode active-material coating layers provided at upper and lower surfaces of a
cathode collector are longitudinally deviated from each other, causing a part of one
cathode active-material coating layer so as not to be included in the other cathode
active-material coating layer, an anode in which an anode active-material coating layer
provided at one surface of an anode collector has a shorter length than that of an anode
active-material coating layer provided at the other surface of the anode collector so as
to be entirely included in the other anode active-material coating layer, and a plurality
of separators interposed between the cathode and the anode facing each other.
[50] Upon winding, the cathode active-material coating layer in a winding beginning
portion of the cathode (i.e. the innermost portion of the jelly-roll configuration) comes
into indirect contact with the anode active-material coating layer with the separator in-
terposed therebetween, and a non-coating part of the cathode collector, which is
provided at an opposite side of the cathode active-material coating layer and does not
contain the cathode active-material coating layer, comes into indirect contact with
another non-coating part with at least two layers of separators (in FIG. 6, four layers of
separators) interposed therebetween.
[51] Specifically, in the cathode according to the present embodiment wherein the
cathode active-material coating layers provided on at least one surface of the cathode
collector are longitudinally deviated from each other, with respect to a region where a
part of one cathode active-material coating layer is not included in the other cathode
active-material coating layer, the cathode active-material coating layer is provided at
only one surface of the cathode collector, and the other surface of the cathode collector
defines a non-coating part containing no cathode active-material coating layer.
[52] Further, in the present embodiment, the winding beginning portion of the cathode
does not contain the cathode uncoated part where both the surfaces of the cathode
collector are provided with no cathode active-material coating layer. This con-
figuration may be realized via. for example, a block-cutting method, or a two-step
cutting method wherein a cathode collector, which initially defines a cathode uncoated
part prior to coating a cathode active-material, is cut once, and after coating the
cathode active-material to both surfaces of the cathode collector, the resulting cathode
active-material coating layers are cut.
[53] In the above-described first embodiment of the present invention, an insulator tape
for prevention of short circuit between electrodes is provided at the boundary of the
cathode active-material coating layer, to prevent short circuit between the anode and

the non-coating part where the cathode active-material coating layer is provided at
only one surface of the cathode collector.
[54] More specifically, the insulator tape 190c is attached to the boundary of the cathode
active-material coating layer provided at the lower surface of the cathode collector at a
tip end of the cathode, and insulator tapes 190b and 190a are attached to the
boundaries of the cathode active-material coating layers 120b and 120a provided at the
lower and upper surfaces of the cathode collector in the winding ending portion of the
cathode, so as to prevent electrical short circuit between the non-coating part
containing no cathode active-material, the anode active-material coating layer and the
anode uncoated part. Preferably, the insulator tapes 190a, 190b and 190c are attached
to the boundaries of the cathode active-material coating layers during an electrode
winding process or during fabrication of a large-width electrode.
[55] As described above, both the cathode lead 160 and the anode lead 170 are arranged
in opposite directions, rather than being arranged in the same direction. In particular,
the cathode collector 110 is not provided at an opposite side of the cathode lead 160
with the cathode uncoated part, so as to prevent short circuit with the anode.
[56] With respect to the cut face of the anode uncoated part 130' provided at the tip end of
the anode, several layers of separators are provided between one side of the cut face
and an innermost end of the wound jelly-roll, and the insulator tape 190c is attached to
the boundary of the cathode active-material coating layer 120b at the other side of the
cut face, achieving enhanced safety against burrs on the cut face. Similarly, the
insulator tapes 190a and 190b are attached to the boundaries of the cathode active-
material coating layers 120b and 120a with respect to a cut face of the anode uncoated
part 130' provided at the winding ending portion of the anode, achieving enhanced
safety against burrs on the cut face.
[57] The separators 150 according to the present invention are positioned such that an
ending portion of each separator extends lengthwise beyond the distal end of the
anode. Accordingly, even if the separators 150a and 150b undergo heat shrinkage, it is
possible to prevent short circuit between the electrodes. Preferably, the ending portion
of the separator extends from the winding ending portion of the anode by a length of at
least 5mm or more.
[58] FIGS. 7 and 8 illustrate an exemplary second embodiment of the present invention.
As compared to the previously described first embodiment, a cathode active-material
coating layer 220a' is further provided at a distal end of a cathode uncoated part at
which a cathode lead 260 is installed. With addition of the cathode active-material

coating layer 220a' at the distal end of the cathode uncoated part, the second em-
bodiment of the present invention can be realized by a one-step cutting method.
[59] Referring to the above drawings, the battery includes a cathode in which cathode
active-material coating layers provided at upper and lower surfaces of a cathode
collector are longitudinally deviated from each other, causing a part of one cathode
active-material coating layer so as not to be included in the other cathode active-
material coating layer, an anode in which an anode active-material coating layer
provided at one surface of an anode collector has a shorter length than that of an anode
active-material coating layer provided at the other surface of the anode collector so as
to be entirely included in the other anode active-material coating layer, and a plurality
of separators interposed between the cathode and the anode facing each other.
[60] Upon winding, the cathode active-material coating layer in a winding beginning
portion of the cathode comes into indirect contact with the anode active-material
coating layer with the separator interposed therebetween, and a non-coating part of the
cathode collector, which is provided at an opposite side of the cathode active-material
coating layer and does not contain the cathode active-material coating layer, comes
into indirect contact with another non-coating part with at least two layers of
separators (in FIG. 10, four layers of separators) interposed therebetween.
[61] Specifically, in the cathode according to the present embodiment wherein the
cathode active-material coating layers provided on both the surfaces of the cathode
collector are longitudinally deviated from each other, with respect to a region where a
part of one cathode active-material coating layer is not included in the other cathode
active-material coating layer, the cathode active-material coating layer is provided at
only one surface of the cathode collector, and the other surface of the cathode collector
defines a non-coating part containing no cathode active-material coating layer.
[62] Further, in the present embodiment, the winding beginning portion of the cathode
does not contain the cathode uncoated part where both the surfaces of the cathode
collector are provided with no cathode active-material coating layer. This con-
figuration may be realized via a one-step cutting method.
[63] Similar to the previously described first embodiment of the present invention, an
insulator tape 290c is attached to the boundary of a cathode active-material coating
layer 220b provided at a lower surface of a cathode collector 210 at a tip end of the
cathode, and insulator tapes 290b and 290a are attached to the boundaries of cathode
active-material coating layers 220b and 220a provided at the lower and upper surfaces
of the cathode collector 210 in the winding ending portion of the cathode, so as to

prevent electrical short circuit between a non-coating part containing no cathode
active-material (cathode uncoated part) and the anode. The insulator tapes 290a. 290b
and 290c are attached to the boundaries of the cathode active-material coating layers
220a and 220b during an electrode winding process or during fabrication of a large-
width electrode.
[64] As described above, both a cathode lead 260 and an anode lead 270 are arranged in
opposite directions, rather than being arranged in the same direction. In particular, the
cathode collector 210 is not provided at an opposite side of the cathode lead 260 with
the cathode uncoated part, so as to prevent short circuit with the anode.
[65] With respect to a cut face of an anode uncoated part 230' provided at a tip end of the
anode, several layers of separators are provided between one side of the cut face and
an innermost end of the wound jelly-roll, and the insulator tape 290c is attached to the
boundary of the cathode active-material coating layer 220b at the other side of the cut
face, achieving enhanced safety against burrs on the cut face. Similarly, the insulator
tapes 290a and 290b are attached to the boundaries of the cathode active-material
coating layers 220b and 220a with respect to a cut face of the anode uncoated part 230'
provided at the winding ending portion of the anode, achieving enhanced safety
against burrs on the cut face.
[66] The separators 250 according to the present invention are positioned such that an
ending portion of each separator extends lengthwise beyond the distal end of the
anode. Accordingly, even if the separators 250a and 250b undergo heat shrinkage, it is
possible to prevent short circuit between the electrodes. Preferably, the ending portion
of the separator extends from the winding ending portion of the anode by a length of at
least 5mm or more.
[67] FIGS. 9 and 10 illustrate an exemplary third embodiment of the present invention. As
compared to the previously described second embodiment, a cathode active-material
coating layer 320a' is further provided in the same manner as the cathode active-
material coating layer 220a', and additionally, an insulator tape 390e is provided on the
cathode active-material coating layer 320a', and an insulator tape 393d is further
provided on a beginning portion of the cathode active-material coating layer at a tip
end of a cathode.
[68] The tip end of the cathode according to the present embodiment can be realized by a
one-step cutting method, and the additional insulator tape 390d is provided thereon.
With provision of the insulator tape 390d at a beginning portion of the cathode active-
material coating layer on the tip end of the cathode, it is possible to prevent short

circuit between a cathode active-material coating layer 320a and an anode active-
material coating layer 343b. which face each other with a separator inteiposed
therebetween.
[69] Explaining the configuration of the battery according to the third embodiment of the
present invention in detail, the battery includes a cathode in which cathode active-
material coating layers provided at upper and lower surfaces of a cathode collector are
longitudinally deviated from each other, causing a part of one cathode active-material
coating layer so as not to be included in the other cathode active-material coating
layer, an anode in which an anode active-material coating layer provided at one surface
of an anode collector has a shorter length than that of an anode active-material coating
layer provided at the other surface of the anode collector so as to be entirely included
in the other anode active-material coating layer, and a plurality of separators in-
terposed between the cathode and the anode facing each other.
[70] Upon winding, the cathode active-material coating layer in a winding beginning
portion of the cathode (i.e. the innermost portion of the jelly-roll configuration) comes
into indirect contact with the anode active-material coating layer with the separator in-
teiposed therebetween, and a non-coating part of the cathode collector, which is
provided at an opposite side of the cathode active-material coating layer and does not
contain the cathode active-material coating layer, comes into indirect contact with
another non-coating part with at least two layers of separators (in FIG. 10, four layers
of separators) interposed therebetween.
[71] Specifically, in the cathode according to the present embodiment wherein the
cathode active-material coating layers provided on both the surfaces of the cathode
collector are longitudinally deviated from each other, with respect to a region where a
part of one cathode active-material coating layer is not included in the other cathode
active-material coating layer, the cathode active-material coating layer is provided at
only one surface of the cathode collector, and the other surface of the cathode collector
defines a non-coating part containing no cathode active-material coating layer.
[72] Insulator tapes 393d and 390c are attached to the boundaries of cathode active-
material coating layers provided at upper and lower surfaces of the cathode collector at
the tip end of the cathode, and insulator tapes 390b and 390a are attached to the
boundaries of the cathode active-material coating layers provided at the upper and
lower surfaces of the cathode collector at an ending portion of the cathode, so as to
prevent electrical short circuit between the non-coating part not containing the cathode
active-material coating layer and an anode active-material coating layer facing each

other. The insulator tapes are attached to the boundaries of the cathode active-material
coating layers during an electrode winding process, or during fabrication of a large-
width electrode.
[73] Both a cathode lead 360 and an anode lead 370 are arranged in opposite directions,
rather than being arranged in the same direction. In particular, the cathode collector
310 is not provided at an opposite side of the cathode lead 360 with the cathode
uncoated part, so as to prevent short circuit with the anode.
[74] With respect to a cut face of an anode uncoated part 330' provided at a tip end of the
anode, several layers of separators are provided between one side of the cut face and
an innermost end of the wound jelly-roll, and the insulator tape 350c is attached to the
boundary of the cathode active-material coating layer 320b at the other side of the cut
face, achieving enhanced safety against burrs on the cut face. Similarly, the insulator
tapes 399a and 390b are attached to the boundaries of the cathode active-material
coating layers 320b and 320a with respect to a cut face of the anode uncoated part 330'
provided at the ending portion of the anode, achieving enhanced safety against burrs
on the cut face.
[75] The separators 350 according to the present invention are positioned such that an
ending portion of each separator extends lengthwise beyond the distal end of the
anode. Accordingly, even if the separators 350a and 350b undergo heat shrinkage, it is
possible to prevent short circuit between the electrodes. Preferably, the ending portion
of the separator extends from the winding ending portion of the anode by a length of at
least 5mm or more.
[76] FIGS. 11 and 12 illustrate an exemplary fourth embodiment of the present invention.
In the present embodiment, a cathode collector 410 is provided at both distal ends
thereof with cathode uncoated parts 410' wherein no cathode active-material coating
layer is present. Accordingly, a cathode active-material coating layer begins to extend
from a position spaced apart from a winding beginning portion of the cathode by a pre-
determined distance. The winding beginning portion of the cathode comes into indirect
contact with an anode active-material coating layer with a separator interposed
therebetween, and a non-coating part of the cathode collector, which is provided at an
opposite side of the cathode active-material coating layer and does not contain the
cathode active-material coating layer, comes into indirect contact with another non-
coating part with at least two layers of separators (in FIG. 12, four layers of separators)
interposed therebetween.
[77] The winding beginning portion of the cathode is formed with a cathode uncoated part

where no cathode active-material coating layer is present via a one-step cutting
method. To prevent electrical short circuit between the non-coating part not containing
the cathode active-material coating layer and an anode active-material coating layer
facing each other, insulator tapes 490d and 490c are attached to the boundaries of
cathode active-material coating layers provided at upper and lower surfaces of the
cathode collector at the tip end of the cathode, and insulator tapes 490b and 490a are
attached to the boundaries of the cathode active-material coating layers provided at the
upper and lower surfaces of the cathode collector at an ending portion of the cathode.
Also, an insulator tape 490e is attached to an upper surface of the cathode uncoated
part at the distal end of the cathode collector where the cathode lead is located. The
insulator tapes 490a, 490b 490c, 490d and 490e are preferably attached to the
boundaries of the cathode active-material coating layers during an electrode winding
process, or during fabrication of a large-width electrode.
[78] Both a cathode lead 460 and an anode lead 470 are arranged in opposite directions,
rather than being arranged in the same direction. In particular, the cathode collector
410 is not provided at an opposite side of the cathode lead 460 with the cathode
uncoated part, so as to prevent short circuit with the anode.
[79] With respect to a cut face of an anode uncoated part 430' provided at a tip end of the
anode, several layers of separators are provided between one side of the cut face and
an innermost end of the wound jelly-roll, and the insulator tape 490c is attached to the
boundary of the cathode active-material coating layer 420b at the other side of the cut
face, achieving enhanced safety against burrs on the cut face. Similarly, the insulator
tapes 490a and 490b are attached to the boundaries of the cathode active-material
coating layer 420b and 420a with respect to a cut face of the anode uncoated part 430'
provided at the winding ending portion of the anode, achieving enhanced safety
against burrs on the cut face.
[80] The separators 450 according to the present invention are positioned such that an
ending portion of each separator extends lengthwise beyond the distal end of the
anode. Accordingly, even if the separators 450a and 450b undergo heat shrinkage, it is
possible to prevent short circuit between the electrodes. Preferably, the ending portion
of the separator extends from the winding ending portion of the anode by a length of at
least 5mm or more.
[81] Although the insulator tapes, used in the respective embodiments of the present
invention, are not limited to special insulator tapes so long as they have excellent
electrical insulation capability, materials having no heat shrinkage up to 200°C are

preferable. Further, using materials having slight shrinkage under the influence of heat
is more preferable to prevent any troubles of a separator interposed between
electrodes.
[82] The insulator tapes may be one or more selected from the group consisting of
polyimide tapes, acetate tapes, glass-cloth tapes, polyester tapes, polyphenylenesulfide
(PPS) tapes and polypropylene tapes, although the present invention is not limited
thereto.
[83] Preferably, the insulator tapes provided in the battery according to the present
invention have a thickness of 10µm to 100µm.
[84] Hereinafter, other constituent elements of the battery according to the present
invention will be described, in particular, with respect to a secondary battery.
[85] Preferably, the cathode collector according to the present invention may be made of
stainless steel, nickel, aluminum, titanium, or alloys thereof, or may have an aluminum
or stainless steel surface treated with carbon, nickel, titanium, or silver. Of these
various materials, aluminum or aluminum alloy is preferable.
[86] Specific examples of a cathode active-material according to the present invention
may include, but are not limited to: lamellar compounds such as lithium cobalt oxide
(LiCoO2), lithium nickel oxide (LiNiO2), etc., or compounds substituted by one or
more transition metals; lithium manganese oxide represented by chemical formula Li
1+xMn2_xO4 (where, x is a value of 0-0.33), such as LiMnO 3, LiMn2O3, LiMnO2, etc.;
lithium copper oxide (Li2CuO2); LiFe3O4; vanadium oxide, such as LiV3O8, V2O5, Cu2
V2O7, etc.; Ni-site type lithium nickel oxide represented by chemical formula LiNi1-x
MxO2 (where, M is Co, Mn, Al. Cu, Fe, Mg, B or Ga, and x is a value of 0.01~0.3);
lithium manganese composite oxide represented by chemical formula LiMn2-xMxO2
(where, M is Co, Ni, Fe, Cr, Zn or Ta, and x is a value of 0.01~0.1) or Li2Mn3MO8
(where, M is Fe, Co, Ni, Cu or Zn); LiMn2O4 in which Li in chemical formula is sub
stituted by alkaline earth metal ions; disulfide compounds; Fe2(Mo04)3, etc. Preferably,
the cathode active-material may be lithium cobalt oxide, lithium manganese oxide,
lithium nickel oxide, lithium manganese cobalt nickel oxide, or composites of two or
more thereof.
[87] The anode collector according to the present invention may be made of stainless
steel, nickel, copper, titanium, or alloys thereof, or may have a copper or stainless steel
surface treated with carbon, nickel, titanium, or silver. Of these various materials,
aluminum or aluminum alloy is preferable.
[88] Specific examples of an anode active-material according to the present invention

may include, but are not limited to; carbon and graphite materials, such as natural
graphite, artificial graphite, expanded graphite, carbon fiber, non-graphitizing carbon,
carbon black, carbon nano-tubes, fullerenes, activated carbon, etc.; metals capable of
being alloyed with lithium, such as Al. Si, Sn, Ag. Bi, Mg. Zn. In. Ge. Ph, Pd, Pt. Ti,
etc. and compounds containing these elements; composites of metals and compounds
thereof and carbon and graphite materials; lithium-based nitrides, etc. Preferably, the
anode active-material may be only one or combinations of two or more selected from
the group consisting of crystalline carbon, amorphous carbon, silicon-based active
materials, tin-based active materials, and silicon-carbon-based active materials. In
addition, a conventional binder, conductor, and additive may be added to the anode,
and detailed examples or contents thereof are sufficient if they fulfill conventional
levels.
[89] The binder serves to assist coupling between the active material and the conductor as
well as coupling between the active material and the collector, and may be added at 1
to 50 weight% based on the total weight of electrode compound mixture. Examples of
the binder include polyvinylidenefluoride (PVDF), polyvinylalcohol, carboxymethyl-
cellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose,
polyvinylpyrrolidone, tetrafluoroethylene, polyethelene, polypropylene, ethylene-
propylene-diene polymer (EPDM), sulfonized EPDM, styrene-butadiene rubber, fluoro
rubber, and various copolymers thereof.
[90] The conductor is a component to further improve conductivity of an electrode active
material, and may be added at 1 to 20 weight% based on the total weight of electrode
compound mixture. The conductor may be selected, without particular limitation, from
materials, which have a desired conductivity and do not cause any chemical variation
in the battery. Examples of the conductor may include graphite, such as natural
graphite, artificial graphite, etc.; black matters, such as carbon black, acetylene black,
Ketjen black, channel black, perneis black, lamp black, summer black, etc.; conductive
fiber, such as carbon fiber, metal fiber, etc.; metal powders, such as fluorocarbon,
aluminum, nickel powder, etc.; conductive whisker, such as zinc oxide, potassium
titanate, etc.; conductive metal oxide, such as titanium oxide, etc.; polyphenylene
derivative, etc.
[91 ] The additive is selectively used to restrict expansion of the anode. The additive is
selected, without particular limitation, from fibrous materials not causing a chemical
variation in the battery. Examples of the additive include olefin-based polymers, such
as polyethylene, polypropylene, etc.: and other fibrous materials, such as glass fiber,

carbon fiber, etc.
[92] The separator, interposed between the cathode and the anode, is an insulating thin-
film having a high ion transmissivity and mechanical strength. The separator has pore
sizes having a diameter of 0.01/µm to 10µm. and a thickness of the separator is within a
range of 5µm to 300µm. For example, the separator may be composed of chemical-
resistant and hydrophobic olefin-based polymers, such as polypropylene, etc.: sheets or
non-woven fabrics made of glass fiber or polyethylene, etc.; and kraft paper, etc. Rep-
resentative examples of currently commercially available separators include Celgard
series products (CelgardTM 24X) & 2300) by Hoechest Celanese Corp., polypropylene
separators by Ube Industries Ltd. or Pall RAI MFG Co.. polyethylene-based separators
by Tonen or Entek, etc.
[93] As occasion demands, to enhance stability of the battery, a gel polymer electrolyte
may be coated over the separator. Representative examples of gel polymers may
include polyethyleneoxide, polyvinylidenefluoride, polyacrylonitrile. etc. When a solid
electrolyte, such as polymers, etc., is used, the solid electrolyte may also serve as a
separator.
[94] The cathode lead and anode lead are attached, in an electrically conductive manner,
to the cathode and anode via welding, such as laser welding, ultrasonic welding or
resistant welding, or by use of a conductive adhesive. Protective tapes, made of in-
sulating materials, are attached to the electrode leads, to prevent short circuit between
the electrodes.
[95] The present invention provides a prismatic battery obtained as the battery having the
above-described configuration is received in a prismatic battery can together and then,
a non-aqueous electrolyte is added.
[96] The non-aqueous electrolyte contains lithium salt, and consists of a non-aqueous
electrolyte solution and lithium salt. The non-aqueous electrolyte is selected from
among a non-aqueous electrolyte solution, solid electrolyte, inorganic solid electrolyte,
etc.
[97] For example, the non-aqueous electrolyte solution may be an aprotic organic solvent,
such as N-methyl-2-pyrollidinon, propylene carbonate, ethylene carbonate, butylene
carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, gamma-
butyro lactone, 1,2-dimethoxy ethane, 1,2-diethoxy ethane, tetrahydroxy franc,
2-mefhyl tetrahydrofurane, dimethylsulfoxide, 1,3-dioxolene, 4-methyl-l,3-dioxene,
diethylether, formamide, dimethylformamide, dioxolene, acetonitrile, nitromethane,
methyl formic acid, methyl acetic acid, phosphoric acid triester, trimethoxy methane,

dioxolene derivative, sulfolane, methyl sulfolane. l,3-dimethyl-24midasolidinone,
propylene carbonate derivative, tetrahydrofurane derivative, ethers, methyl propionic
acid, ethyl propionic acid. etc.
[98] For example, the organic solid electrolyte may be a polyethylene derivative,
polyethylene oxide derivative, polypropylene oxide derivative, phosphoric acid ester
polymer, polyagitation lysine, polyester sulfide, polyvinylalcohol. poly fluo-
rovinylidene. polymers containing ionic disintegrators, etc.
[99] The inorganic solid electrolyte, for example, may include Li-based nitrides, such as
Li3N, Lil, Li5NI,, Li3N-LiI-LiOH. LiSiO4, LiSiO4-LiI-LiOH, Li2SiS3, Li4SiO4, Li4SiO4 -
Lil-LiOH. Li3Po4-Li2S-SiS2. etc. halides, sulfates, etc.
[100] The lithium salt is a material sufficiently soluble in the non-aqueous electrolyte and
for example, may be LiCl. LiBr. Lil, LiClO4. LiBF4, LiB10ClI0. LiPF6, LiCF3SO3,
LiAsF6, LiSbF6, LiAlCL,, CH3SO3Li, CF3SO3Li, LiSCN, LiC(CF3SO2)3, (CF3SO2)2NLi,
chloroboranlithium. low-grade aliphatic carbonic acid lithium. 4-phenyl-boric acid
lithium, imides, etc.
[101] For the purpose of enhancing charge and discharge characteristics, fire-retardancy,
etc., for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylene
diamine, n-glyme, hexa phosphoric acid tri amide, nitrobenzene derivative, sulfur,
quinone imine colorant. N-substituted oxasolidinone, N,N-substituted imidasolidine,
ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxy ethanol, trichloro
aluminum, etc. may be added to the non-aqueous electrolyte. As occasion demands, to
endow incombustibility, a halogen containing solvent, such as tetrachlorocarbon, tri-
fluoroethylene, etc., may be added to the non-aqueous electrolyte. Further, to improve
high-temperature maintenance characteristics, carbon dioxide gas may be further
added to the non-aqueous electrolyte.
[102] Now, the fabrication of the prismatic lithium battery according to the present
invention will be described in brief. First, an electrode group having an approximately
oval cross section is prepared by winding a cathode and an anode with a separator in-
terposed therebetween, the separator being made of a non-porous polyethylene film
having a thickness of 20/µm. The electrode group is received in a prismatic aluminum
battery can having the bottom and sidewall. The top of the battery can define an
opening and has an approximately square form. Thereafter, an insulator tape to prevent
short circuit between a cathode lead or anode lead and the battery can is prepared and
additionally, insulator tapes are prepared at respective regions having a risk of short
circuit.

[103] In the present invention, when an insulator tape is attached to a non-coating part
containing no cathode active-material coating layer which faces an anode active-
material coating layer, the insulator tape may be formed via an insulator tape at-
tachment apparatus in a winding process, or may be attached by a length corre-
sponding to a width of an electrode during an electrode coating process. Then, a
spherical sealing member in which an anode terminal surrounded by an insulating
gasket is centrally provided is disposed in the opening of the battery can, and the anode
lead is connected to the anode terminal. The cathode lead is connected to a lower
surface of the sealing member. As the sealing member is welded to the periphery of the
opening via laser welding, the opening of the battery can is sealed. Thereafter, a non-
aqueous electrolyte is injected into the battery can through an injection hole perforated
in the sealing member. Finally, as the injection hole is blocked by a plug via welding,
the fabrication of the prismatic lithium secondary battery is completed.
[104] The batteries fabricated according to the first to fourth embodiments as shown in
FIGS. 5 and 6, FIGS. 7 and 8, FIGS. 9 and 10 and FIGS. 11 and 12 and the con-
ventional battery as shown in FIG. 1 were subjected to stability estimation via a hot
box test, and the results of which are shown in the following Table 1. Here, the hot box
test was performed at 150°C for 1 hour.
[105]
[106] Table 1
[Table 1]
[Table ]

[107]
[108] As can be seen from the results of the above Table 1, the prismatic battery fabricated
according to the present invention has no risk of internal short circuit under any
dangerous environment, achieving considerably enhanced safety of the battery.
[109]
Mode for the Invention

[110] Various embodiments have been described in the best mode for carrying out the
invention.
[111]
Industrial Applicability
[112] The present invention is applicable to a lithium secondary battery for achieving
enhanced electrical insulation capability and consequential safety of the battery.
[113] Although the preferred embodiments of the present invention have been disclosed for
illustrative purposes, those skilled in the art will appreciate that various modifications,
additions and substitutions are possible, without departing from the scope and spirit of
the invention as disclosed in the accompanying drawings.

Claims
[ 1 ] A battery comprising: a cathode having a cathode active-material coating layer
provided on at least one surface of a cathode collector; and an anode having an
anode active-material coating layer provided on at least one surface of an anode
collector, the cathode and anode being wound to face each other with a separator
interposed therebetween.
wherein the cathode active-material coating layer applied to the at least one
surface of the cathode collector is longitudinally deviated from a cathode active-
material coating layer applied to the other surface of the cathode collector such
that application beginning and ending portions of both the cathode active-
material coating layers are not consistent with each other, and only at least one of
a winding beginning portion and winding ending portion of the cathode is
provided with a cathode uncoated part for installation of a cathode lead, and
wherein an insulator tape is attached to the boundary of the cathode active-
material coating layer at a position where the anode active-material coating layer
faces a non-coating part of the cathode not containing the cathode active-material
coating layer.
[2] A battery comprising: a cathode having a cathode active-material coating layer
provided on at least one surface of a cathode collector; and an anode having an
anode active-material coating layer provided on at least one surface of an anode
collector, the cathode and anode being wound to face each other with a separator
interposed therebetween,
wherein the cathode active-material coating layer applied to the at least one
surface of the cathode collector is longitudinally deviated from a cathode active-
material coating layer applied to the other surface of the cathode collector such
that application beginning and ending portions of both the cathode active-
material coating layers are not consistent with each other, only at least one of a
winding beginning portion and winding ending portion of the cathode is
provided with a cathode uncoated part for installation of a cathode lead, and an
additional cathode active-material coating layer is provided on at least one
surface of a distal end of the cathode uncoated-part, and
wherein an insulator tape is attached to the boundary of the cathode active-
material coating layer at a position where the anode active-material coating layer
faces a non-coating part of the cathode not containing the cathode active-material

coating layer.
[3] A battery comprising: a cathode having a cathode active-material coating layer
provided on at least one surface of a cathode collector; and an anode having an
anode active-material coating layer provided on at least one surface of an anode
collector, the cathode and anode being wound to face each other with a separator
interposed therebetween.
wherein the cathode active-material coating layer applied to the at least one
surface of the cathode collector is longitudinally deviated from a cathode active-
material coating layer applied to the other surface of the cathode collector such
that application beginning and ending portions of both the cathode active-
material coating layers are not consistent with each other,
wherein the cathode is provided at a winding beginning portion and winding
ending portion thereof with cathode uncoated parts, respectively, a cathode lead
is installed to at least one of the cathode uncoated parts of the winding beginning
portion and winding ending portion, and an insulator tape is provided at a distal
end of the cathode uncoated-part containing the cathode lead, and
wherein an insulator tape is attached to the boundary of the cathode active-
material coating layer at a position where the anode active-material coating layer
faces a non-coating part of the cathode not containing the cathode active-material
coating layer.
[4] The battery according to claim 1 or 2, wherein a tip end of the cathode, which
corresponds to the application beginning portion of the cathode active-material
coating layer provided on the at least one surface of the cathode collector and the
application beginning portion of the cathode active-material coating layer
provided on the other surface of the cathode collector, is provided on only at
least one surface thereof with the cathode active-material coating layer, and is
provided on the other surface thereof with a non-coating part not containing the
cathode active-material coating layer.
[5] The battery according to claim 3,
wherein the cathode has the cathode uncoated-parts not containing the cathode
active-material coating layer at both distal ends of the cathode collector, and
wherein a tip end of the cathode, which corresponds to the application beginning
portion of the cathode active-material coating layer provided on the at least one
surface of the cathode collector and the application beginning portion of the
cathode active-material coating layer provided on the other surface of the

cathode collector, is provided on only at least one surface thereof with the
cathode active-material coating layer, and is provided on the other surface
thereof with a non-coating part not containing the cathode active-material
coating layer.
[6] The battery according to any one of claims 1 to 3, wherein the non-coating part,
not containing the cathode active-material coating layer, provided at the tip end
of the cathode faces another non-coating part not containing the cathode active-
material coating layer with the separator interposed therebetween.
[7] The battery according to claim 6, wherein the separator is provided in at least
two layers.
[8] The battery according to claim 1. wherein, on the basis of the winding beginning
portion, the insulator tape is attached to the boundary of the cathode active-
material coating layer at both distal ends of a lower surface of the cathode
collector and to the boundary of the cathode active-material coating layer at a
distal end of an upper surface of the cathode collector.
[9] The battery according to claim 2, wherein, on the basis of the winding beginning
portion, the insulator tape is attached to the boundary of the cathode active-
material coating layer at both distal ends of a lower surface of the cathode
collector and to the boundary of the cathode active-material coating layer at a
distal end of an upper surface of the cathode collector.
[10] The battery according to claim 2, wherein, on the basis of the winding beginning
portion, the insulator tape is attached to the boundary of the cathode active-
material coating layer at both distal ends of an upper surface of the cathode
collector, to the boundary of the cathode active-material coating layer at both
distal ends of a lower surface of the cathode collector, and to the boundary of the
cathode active-material coating layer at the distal end of the cathode uncoated-
part.
[11] The battery according to claim 3, wherein, on the basis of the winding beginning
portion, the insulator tape is attached to the boundary of the cathode active-
material coating layer at both distal ends of an upper surface of the cathode
collector, to the boundary of the cathode active-material coating layer at a distal
end of a lower surface of the cathode collector, and to the distal end of the
cathode collector where the cathode lead is installed.
[12] The battery according to any one of claims 1 to 3, wherein the insulator tape is
provided during a winding process or electrode coating process.

[ 13] The buttery according to any one of claims I to 3. wherein the cathode lead and
an anode lead of the battery are arranged in opposite directions.
[ 14] The buttery according to any one of claims 1 to 3. wherein the anode is provided
on at least one of a winding beginning portion and winding ending portion
thereof with an anode uncoated-part not containing the anode active-material
coating layer for connection of an anode lead, and wherein two or more insulator
layers are provided on the other surface of the anode collector, to which the
anode lead is connected, at a position corresponding to the anode lead.
[15] The buttery according to any one of claims 1 to 3. wherein a cut face of an anode
uncoated part provided at a tip end of the anode as a winding beginning portion
is insulated and protected by a plurality of separators, and an opposite side of the
anode uncoated part is protected by the insulator tape on the boundary of the
cathode active-material coating layer, and wherein a cut face of the anode
uncoated part at a distal end of the anode as a winding ending portion is
protected by the insulator tape on the boundary of the cathode active-material
coating layer.
[16] The buttery according to any one of claims 1 to 3. wherein an ending portion of
the separator extends beyond a distal end of the anode.
[17] The battery according to claim 16. wherein the ending portion of the separator
extends from the distal end of the anode by about 5mm or more.
[ 18] The battery according to any one of claims 1 to 3. wherein the insulator tape is
one or more selected from the group consisting of a polyimide tape, acetate tape,
glass cloth tape, polyester tape, polyphenylenesulfide (PPS) tape, and
polypropylene tape.
[191 The battery according to any one of claims 1 to 3. wherein the insulator tape has
a thickness of 10/µm to 100/µm.
[201 A prismatic battery wherein the battery according to claim 1 is received in a
prismatic battery can, and a non-aqueous electrolyte is further provided.
[21] A prismatic battery wherein the battery according to claim 2 is received in a
prismatic battery can, and a non-aqueous electrolyte is further provided.
[22] A prismatic battery wherein the battery according to claim 3 is received in a ,
prismatic battery can, and a non-aqueous electrolyte is further provided.

Disclosed is a battery including a cathode in which cathode active-material coating layers provided on both surfaces
of a cathode collector are longitudinally deviated from each other, and an anode having at least one anode active-material coating
layer provided on an anode collector, the cathode and anode being wound to face each other with a separator interposed therebetween.
At least one of a winding beginning portion and winding ending portion of the cathode is provided with a cathode uncoated part for
installation of a cathode lead. An insulator tape is attached to the boundary of the cathode active-material coating layer at a position
where the anode active-material coating layer faces a non-coating part of the cathode not containing the cathode active-material
coating layer, achieving enhanced electrical insulation capability and consequential safety of the battery.