JP2002239440A - Wiping removal device and wiping removal method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To significantly improve the yield and quality of a strip-shaped base material obtained by wiping and removing excess coating liquid attached to an uncoated portion. SOLUTION: A wiping removal device 10 has a woven fabric 22 containing abrasive grains, and slides the woven fabric 22 on a running intermittently coated band-shaped base material 2 to thereby form an intermittently coated strip. The coating liquid scattered matter 3b attached to the uncoated portion 15 of the base material 2 is wiped off and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiping and removing apparatus and a wiping and removing method for wiping and removing a coating liquid adhering to an uncoated portion of a band-shaped substrate intermittently coated with a coating liquid at a predetermined interval. .

[0002]

2. Description of the Related Art In recent years, a camera-integrated VTR (v
video tape recorder), mobile phones,
Many portable electronic devices such as portable computers have appeared, and their size and weight have been reduced. In these electronic devices, a battery is used as a portable power supply, and in particular, a secondary battery capable of repeating charge and discharge is often used. Among these secondary batteries, lithium ion secondary batteries have high energy density, cycle life,
Research and development on safety, rapid charging performance, and the like are being actively promoted, and the demand for them is increasing.

On the electrode of a lithium ion secondary battery, an electrode active material is coated on a portion where the current collector is exposed, that is, on a side end of the current collector in order to weld a terminal for current collection. There are unworked parts. In such an electrode, a coating liquid containing an electrode active material is intermittently applied at a predetermined interval on a main surface of a belt-shaped base material serving as a current collector, dried, and then coated with a coating liquid. It is manufactured by cutting every missing part. Alternatively, a coating liquid is applied on the main surface of the belt-shaped base material serving as a current collector without gaps, and after drying, the coating liquid is removed at predetermined intervals. It is produced by cutting.

When the above-mentioned intermittent coating is performed, for example, a coating apparatus 100 as shown in FIG. 6 is used.

[0005] The coating apparatus 100 includes a die head 103 for extruding a coating liquid 101 on a main surface of a belt-shaped base material 102 at a predetermined interval, and a backup roll 104 opposed to the die head 103.

The die head 103 opens and closes a shutter 105 in a direction indicated by an arrow X in FIG.
01 is extruded onto the main surface of the band-shaped base material 102 at a predetermined interval, and the coating liquid 101 extruded on the main surface of the band-shaped base material 102 is scraped off with a blade 106 to perform intermittent coating to a predetermined thickness. To go.

The backup roll 104 is indicated by an arrow Y in FIG.
In the state where the belt-like base material 102 is hung on the peripheral surface thereof in a state where it is rotatable in the direction shown by
The vehicle travels in the direction indicated by.

In the coating apparatus 100, a shutter 105 of a die head 103 disposed opposite to a backup roll 104 opens and closes at a predetermined interval. Then, when the shutter 105 is opened, the coating liquid 101 falls under its own weight and is extruded onto the main surface of the belt-shaped substrate 102 at a predetermined interval. As a result, in the coating apparatus 100, a coating portion 101a on which the coating liquid 101 is coated and a coating portion 101a on which the coating liquid 101 is not coated on the main surface of the belt-shaped base material 102 as shown in FIG. Intermittent coating in which the coating portions 107 are alternately formed can be performed.

[0009]

By the way, in the above-described coating apparatus 100, when the intermittent coating is performed, the band-shaped substrate 1
In some cases, the scattered coating liquid 101 adheres to the non-coated portion 107 of No. 02 as a scattered coating liquid 101b.

Specifically, in the coating apparatus 100, a wedge-shaped gap 108 is formed between the die head 103 and the backup roll 104, and air enters the gap 108 due to the traveling of the belt-shaped base material 102. At this time,
With respect to the boundary position R between the blade 106 of the die head 103 and the coated portion 101a of the band-shaped base material 102, the band-shaped base material 1
In the traveling direction 02, the pressure on the front stage side is higher than the pressure on the rear stage side. For this reason, in the coating apparatus 100, when the coating part 101a separates from the blade 106 at the boundary position R, the pressure on the front stage in the traveling direction of the strip-shaped base material 102 is released toward the rear stage. , This coated part 101a
Of the end portion of the coating material 101 is blown away,
In some cases, the coating liquid flying object 101b might adhere to the uncoated portion 107 of No. 2.

In the case where an electrode of a lithium ion secondary battery is manufactured using the band-shaped substrate 102 having the coating liquid scattered matter 101b adhered to the uncoated portion 107, the uncoated portion of the band-shaped substrate 102 Since the processing portion 107 is a portion for welding the above-described current collecting terminal, the metallic lithium is attached to the coating liquid scattered matter 101b attached to the current collecting terminal welding portion when charging and discharging are performed. Is deposited, and the deposited metallic lithium breaks through the separator, thereby causing a risk of causing an internal short circuit.

Therefore, conventionally, after the drying step of drying the coating liquid 101 intermittently applied on the main surface of the belt-shaped base material 102, the wiping and removing device 200 as shown in FIG. The scattered coating liquid 101b adhering to the uncoated portion 107 of the material 102 is wiped off and removed.

The wiping and removing apparatus 200 includes an uncoated portion 1
The wiping / removal rotor 201 for wiping and removing the coating liquid scattered matter 101b attached to the reference numeral 07, and a backup roll 202 facing the wiping / removing rotor 201 are provided.

As shown in FIGS. 8 and 9, the wiping-removal rotor 201 has a substantially cylindrical shape which is rotatable in a direction indicated by an arrow S in the figure. Brushes 203 are provided at predetermined intervals in the width direction of the wiping and removing rotor 201. In addition,
FIG. 9 is a cross-sectional view taken along line TT ′ in FIG.

The backup roll 202 has a substantially cylindrical shape which is rotatable in the direction indicated by the arrow U in FIG. 8, and the intermittently coated band-shaped substrate 102 is hung on its peripheral surface in FIG. The vehicle travels in the direction indicated by arrow V.

In the wiping and removing apparatus 200, the brush 203 provided on the peripheral surface of the wiping and removing rotor 202 is brought into sliding contact with the main surface of the strip-shaped substrate 102 in the width direction while rotating the wiping and removing rotor 202. Thus, the wiping and removing apparatus 200 can wipe and remove the coating liquid flying object 101b attached to the uncoated portion 107 of the intermittently coated band-shaped base material 102.

However, in such a conventional wiping and removing apparatus 200, when the brush 203 provided on the peripheral surface of the wiping and removing rotor 201 is brought into sliding contact with the intermittently coated band-shaped base material 102, the brush 203 is It comes into linear contact with the belt-shaped base material 102.

For this reason, in the wiping and removing apparatus 200, even if the brush 203 is slid in the width direction on the main surface of the belt-shaped base material 102, a gap is generated between the brushes 203. Therefore, the coating liquid scattered matter 101b attached to the uncoated portion 107 of the band-shaped base material 102 cannot be completely wiped and removed, and the coating liquid scattered matter 101b is not removed from the uncoated portion 107 of the band-shaped base material 102. There was a problem that it remained.

In the conventional wiping and removing apparatus 200, the brush 203 is liable to be worn because the brush 203 linearly slides on the band-shaped base material 102, and the brush 203 needs to be replaced frequently. This causes a problem that productivity is greatly reduced.

As described above, in the conventional wiping and removing apparatus 200, the uncoated portion 107 of the intermittently coated band-shaped base material 102 is used.
It is difficult to completely wipe and remove the coating liquid scattered matter 101b attached to the surface. Therefore, when a lithium ion secondary battery is manufactured using the band-shaped base material 102 on which the coating liquid splatter 101b remains, metallic lithium is deposited on the coating liquid splatter 101b as described above, and an internal short circuit occurs. There is a risk of occurrence.

Therefore, when manufacturing an electrode of a lithium ion secondary battery, it is important to know how the coating liquid splatter 101b adhering to the uncoated portion 107 of the intermittently coated belt-like substrate 102 can be wiped and removed. It is extremely important.

Therefore, the present invention has been devised in view of such conventional circumstances, and by appropriately wiping and removing the coating liquid adhering to the uncoated portion of the belt-like base material, It is an object of the present invention to provide a wiping and removing apparatus and a wiping and removing method which can significantly improve the yield and quality of a band-shaped base material intermittently coated.

[0023]

In order to achieve the above-mentioned object, a wiping and removing apparatus according to the present invention comprises: a traveling means for traveling a band-shaped substrate on which a coating liquid is intermittently coated at predetermined intervals;
Wiping and removing means for wiping and removing the coating liquid adhered to the uncoated portion of the belt-shaped substrate while slidingly contacting the belt-shaped substrate traveled by the traveling means, wherein the wiping and removing means comprises a woven material containing abrasive grains. It is characterized by having a cloth and sliding the woven cloth against the belt-like base material traveled by the traveling means, thereby wiping and removing the coating liquid attached to the uncoated portion of the belt-like base material.

As described above, in the wiping and removing apparatus according to the present invention, the wiping and removing means slides the woven fabric containing the abrasive grains on the belt-like base material traveled by the running means, so that the belt-like base material is used. The coating liquid adhering to the uncoated portion is appropriately wiped off and removed.

Further, in order to achieve the above object, the wiping and removing method according to the present invention is directed to a method for removing a coating liquid adhering to an uncoated portion of a band-shaped substrate intermittently coated with a coating liquid at a predetermined interval. When wiping and removing, using a woven fabric containing abrasive grains, while slidably contacting the woven fabric with the running strip-shaped substrate, wiping and removing the coating liquid attached to the uncoated portion of the strip-shaped substrate. It is characterized by:

As described above, in the wiping and removing method according to the present invention, the woven fabric containing abrasive grains is brought into sliding contact with the belt-shaped base material so that the coating liquid adhering to the uncoated portion is appropriately wiped and removed. can do.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As an embodiment of the present invention, an electrode manufacturing apparatus 1 shown in FIG. 1 has a coating liquid 3 containing an electrode active material on a main surface of a band-shaped base material 2 serving as a current collector of an electrode at a predetermined interval. For intermittent coating.

Here, the band-shaped substrate 2 is made of, for example, foil-like aluminum or the like when producing a positive electrode, and is made of foil-like copper or the like when producing a negative electrode.

The coating liquid 3 comprises a positive electrode coating liquid containing a positive electrode active material when producing a positive electrode, and comprises a
It is composed of a negative electrode coating solution containing a negative electrode active material.

The positive electrode coating solution is, for example, of the general formula Li _x MO
₂ (M in the formula is one or more transition metals, and x is 0.
05 ≦ x ≦ 1.10), a positive electrode active material which is a lithium composite oxide, a conductive agent such as a carbon material, and a binder which is a fluorine-based binder such as polyvinylidene fluoride resin. N-methyl-2-pyrrolidone (hereinafter, referred to as NMP) is added as a solvent to the positive electrode mixture mixed with the adhesive, and the mixture is dispersed by, for example, a planetary mixer or the like to prepare a slurry. .

As the positive electrode active material, it is preferable to use at least one of Co, Ni and Mn as the transition metal M included in the above formula representing the lithium composite oxide. In particular, it is preferable to use Co. The lithium composite oxide includes a salt of lithium and a transition metal M, for example, a carbonate,
Manufactured using nitrates, oxides, halides and the like as raw materials. Then, the lithium salt raw material and the transition metal M raw material are respectively weighed according to a desired composition, mixed sufficiently, and then heated and fired in an oxygen atmosphere at a temperature range of about 600 ° C to 1000 ° C. In addition, in such a positive electrode active material, the mixing method of each component is not particularly limited, and powdery salts may be mixed in a state of being dissolved in water or the like.

The negative electrode coating liquid is prepared by mixing a negative electrode active material such as a carbon material capable of doping and dedoping lithium with a binder such as a polyvinylidene fluoride resin and a fluorine-based binder. It is prepared by adding NMP as a solvent and dispersing it with, for example, a planetary mixer or the like to prepare a slurry.

The negative electrode active material may be a low crystalline carbon material obtained by firing at a relatively low temperature of about 2000 ° C. or a high crystalline material obtained by firing a crystallizable raw material at a temperature of about 3000 ° C. It is made of conductive carbon material. For example, pyrolytic carbons, cokes (pitch coke, needle coke, petroleum coke, etc.), artificial graphites, natural graphites,
Glassy carbons, organic polymer compound fired bodies (furan resin or the like fired at an appropriate temperature and carbonized), carbon fibers, activated carbons, and the like are available. In particular, (00)
2) The surface spacing is 3.70 or more, and the true density is 1.70 g.
/ Cc, 700 ° C in differential thermal analysis in air flow
It is desirable to use a low crystalline carbon material having no heat generation peak as described above.

The electrode manufacturing apparatus 1 includes a supply roll 4 for feeding a strip-shaped base material 2 running in the direction indicated by A in the figure, and a winding roll 5 for winding the strip-shaped base material 2 on which the coating liquid 3 is intermittently applied. And rolls 6 a to 6, which draw the strip-shaped base material 2 running between the supply roll 4 and the take-up roll 5.
Roll 6i. Also, this electrode manufacturing apparatus 1
Are tension rolls 7a and 7b which are located between the rolls 6a and 6b and between the rolls 6h and 6i and always apply a constant tension to the running belt-shaped substrate 2.
It has.

The electrode manufacturing apparatus 1 is interposed between the roll 6e and the roll 6f in the traveling path of the strip-shaped base material 2 and intermittently applies the coating liquid 3 on the main surface of the strip-shaped base material 2. Coating device 8 for performing coating, a drying device 9 that is located at a later stage side in the running direction of the band-shaped substrate 2 with respect to the coating device 8 and dries the intermittently applied coating liquid 3, a roll 6f and a roll 6 g, the coating liquid 3 attached to the uncoated portion of the belt-shaped base material 2.
And a wiping and removing apparatus 10 to which the present invention is applied.

In this electrode manufacturing apparatus 1, a coating apparatus 8
Is for intermittently applying the coating liquid 3 on the main surface of the strip-shaped base material 2 running between the supply roll 4 and the winding roll 5 described above. A die head 11 for extruding the coating liquid 3 at a predetermined interval, and a backup roll 12 arranged to face the die head 11.

As shown in FIG. 2, the die head 11 pushes the coating liquid 3 onto the main surface of the belt-shaped base material 2 at a predetermined interval by opening and closing the shutter 13 in the direction indicated by the arrow B in the drawing. The coating liquid 3 extruded onto the main surface of the belt-shaped substrate 2 is scraped off by a blade 14 to perform intermittent coating to a predetermined thickness.

The backup roll 12 has a substantially cylindrical shape which is rotatable in the direction indicated by the arrow C in the figure, and runs in a state where the belt-shaped base material 2 is hung on its peripheral surface.

In the coating apparatus 8 configured as described above,
Die head 1 arranged opposite backup roll 12
One shutter 13 opens and closes at a predetermined interval. Then, when the shutter 13 is opened, the coating liquid 3 falls by its own weight and is pushed out onto the main surface of the belt-shaped substrate 2 at a predetermined interval. Thereby, in the coating device 8, the coating portion 3a on which the coating liquid 3 is applied and the coating portion 3a on which the coating liquid 3 is not applied are formed on the main surface of the belt-shaped base material 2 as shown in FIG. Intermittent coating in which the coating portions 15 are alternately formed can be performed.

In the electrode manufacturing device 1, the drying device 9
This is for drying the intermittently applied coating liquid 3 on the main surface of the belt-shaped base material 2 by the above-described coating device 8, and is provided with, for example, a drying furnace (not shown) divided into a plurality. And an infrared dryer, a hot-air dryer, a hot-roll scan dryer, and the like.

In the drying device 9 configured as described above,
The solvent component of the coating liquid 3 intermittently coated on the main surface of the belt-shaped substrate 2 can be dried by the various dryers described above.

By the way, in the electrode manufacturing apparatus 1 described above,
As shown in FIG. 2, when intermittent coating is performed by the coating device 8, the coating liquid 3 scattered on the uncoated portion 15 of the strip-shaped base material 2 adheres as a coating liquid scattered matter 3 b. There was something.

Specifically, in the coating apparatus 8, the die head 1
1 and the backup roll 12, a wedge-shaped gap 16
Is formed, and air enters into the gap 16 by the traveling of the belt-shaped base material 2. At this time, with respect to the boundary position D between the blade 14 of the die head 11 and the coated portion 3a of the strip-shaped base material 2, the pressure on the front side in the running direction of the strip-shaped base material 2 becomes higher than the pressure on the rear side. .

For this reason, in the coating device 8, when the coating portion 3a separates from the blade 14 at the boundary position D, the pressure on the front side in the running direction of the strip-shaped base material 2 is released toward the rear side. Therefore, the coating liquid 3 was blown off at the end of the coating part 3a, and the coating liquid scattered matter 3b might adhere to the uncoated part 15 of the belt-shaped base material 2.

In the coating apparatus 8, when intermittent coating is performed on both main surfaces of the strip-shaped base material 2, the intermittent coating is performed after intermittent coating is performed on one main surface side of the strip-shaped base material 2. The number of the coating liquid splatters 3b attached to the uncoated portion 15 on the main surface side is reduced. This is because if one main surface side of the belt-shaped base material 2 is intermittently coated and then the other main surface side is intermittently coated, the position of the coating portion 3a coincides between the front and back sides. This is because the pressure at which the coating liquid 3 is blown off decreases by the thickness of the coated portion 3a.

Therefore, in the above-described electrode manufacturing apparatus 1, by using the wiping and removing apparatus 10 to which the present invention is applied,
The coating liquid splatter 3b attached to the uncoated portion 15 of the belt-shaped base material 2
To remove.

More specifically, in the electrode manufacturing apparatus 1, the wiping and removing apparatus 10 is for wiping and removing the coating liquid scattered matter 3 b adhered to the uncoated portion 15 of the intermittently coated band 2. The wiping-removal rotor 20 for wiping and removing the coating liquid scattered object 3b, and a backup roll 21 arranged opposite to the wiping-removal rotor 20 are provided.

As shown in FIGS. 4 and 5, the wiping-removal rotor 20 has a substantially columnar shape, and a woven cloth 22 containing abrasive grains is provided on its peripheral surface in the width direction of the wiping-removal rotor 20. It is provided over the entire circumference. FIG. 5 is a cross-sectional view taken along line EE ′ in FIG.

The woven fabric 22 is formed by knitting, for example, a nylon fiber containing abrasive grains made of Al ₂ O ₃ into a cloth. The grain size of the abrasive grains is 5 μm or more,
Moreover, it is about 25 μm or less.

The wiping removal rotor 20 is rotationally driven by a drive motor (not shown) connected to its support shaft in the same direction as the running direction of the strip-shaped substrate 2 shown by the arrow F in FIG. . Further, a rotation control unit (not shown) for controlling the rotation speed of the wiping removal rotor 20 is connected to the drive motor, and the rotation control unit arbitrarily adjusts the rotation speed of the wiping removal rotor 20. It is possible to do. Specifically, the rotation control unit determines that the woven fabric 22 is not coated on the uncoated portion of the strip-shaped base material 2 than the rotation speed of the wiping removal rotor 20 while the woven fabric 22 is in sliding contact with the coated portion 3a of the strip-shaped base material 2. The number of revolutions of the wiping-removal rotor 20 is controlled so that the number of revolutions of the wiping-removal rotor 20 during the sliding contact with the rotor 15 increases. The wiping-removal rotor 20 is not necessarily driven to rotate in the same direction as the traveling direction of the belt-shaped substrate 2, and is driven to rotate in the opposite direction to the traveling direction of the belt-shaped substrate 2. It may be made to do.

The backup roll 21 has a substantially cylindrical shape rotatable in a direction indicated by an arrow G in the figure, and runs in a state where the intermittently coated band-shaped base material 2 is hung on its peripheral surface. It has been done. The traveling speed of the belt-shaped base material 2 traveling on the peripheral surface of the backup roll 21 is 1 m /
Min and not more than 150 m / min, here, 150 m / min.

The wiping and removing apparatus 10 configured as described above.
, The uncoated portion 15 of the intermittently coated band-shaped base material 2
When the wiping removal rotor 20 is rotated while rotating the wiping removal rotor 20, the intermittently coated belt-like shape is used to wipe and remove the coating liquid scattered matter 3 b attached to the belt. The main surface of the substrate 2 is slid in the width direction.

Thus, in the wiping and removing device 10, the fibers woven into the cloth of the woven fabric 22 wipe the coating liquid scattered matter 3 b attached to the uncoated portion 15 of the intermittently coated band-shaped base material 2. However, since the abrasive grains contained in the woven fabric 22 are scraped off, the scattered coating liquid 3b attached to the uncoated portion 15 of the strip-shaped base material 2 can be appropriately wiped and removed.

Incidentally, the above-described conventional wiping and removing apparatus 2
In 00, while rotating the wiping-removal rotor 202, the brush 203 provided on the peripheral surface is slidably contacted on the main surface of the belt-shaped base material 102 in the width direction. It will slide linearly on the other hand.

For this reason, in the conventional wiping and removing apparatus 200, even if the brush 203 is slid in the width direction on the main surface of the belt-shaped substrate 102, a gap is generated between the brushes 203. Therefore, the coating liquid scattered matter 101b attached to the uncoated portion 107 of the belt-shaped base material 102 cannot be completely wiped and removed, and the coating liquid scattered material 101b There is a problem that 101b remains.

On the other hand, in the wiping and removing apparatus 10 to which the present invention is applied, while the wiping and removing rotor 20 is rotated,
A woven fabric 22 containing abrasive grains provided on the peripheral surface thereof is slid in the width direction on the main surface of the belt-shaped base material 2, and the woven fabric 22 containing the abrasive grains is placed in the belt-shaped base material 2. Slidable contact with the surface.

For this reason, in the wiping and removing apparatus 10, when the woven fabric 22 containing the abrasive grains is slid in the width direction on the main surface of the belt-shaped substrate 2, the woven fabric 22 containing the abrasive grains is removed. Since the sliding member 22 is in close sliding contact with the belt-shaped base member 2 without any gap, the coating liquid scattered matter 3b attached to the uncoated portion 15 of the belt-shaped base member 2 can be appropriately wiped and removed.

Further, in the wiping and removing apparatus 10, since the woven fabric 22 is in close sliding contact with the strip-shaped base material 2 without any gap, the abrasion of the woven fabric 22 is suppressed, and the woven fabric 22 is frequently removed. There is no need for replacement, and the productivity can be greatly improved.

Further, the wiping and removing apparatus 10 contains abrasive grains with respect to the number of rotations of the wiping and removing rotor 20 while the woven fabric 22 containing the abrasive grains is in sliding contact with the coated portion 3a of the belt-shaped substrate 2. The rotation control unit controls the rotation speed of the wiping-removal rotor 20 such that the rotation speed of the wiping-removal rotor 20 increases while the woven fabric 22 to be slid on the uncoated portion 15 of the belt-shaped substrate 2.

Thus, in the wiping and removing apparatus 10,
It is possible to appropriately wipe and remove only the coating liquid scattered matter 3b attached to the uncoated portion 15 without damaging the coated portion 3a of the intermittently coated band-shaped substrate 2.

In the wiping and removing apparatus 10, the abrasive particles are contained in the wiping and removing rotor 20 while the woven fabric 22 containing the abrasive particles is in sliding contact with the coating portion 3 a of the belt-shaped substrate 2. The wiping removal rotor 20 is rotated by the rotation control unit such that the number of rotations of the wiping-removal rotor 20 while the woven fabric 22 is in sliding contact with the uncoated portion 15 of the belt-shaped base material 2 is more than 1 and less than 250 times. Preferably, the number of revolutions of the removal rotor 20 is controlled.

Here, the rotation speed of the wiping removal rotor 20 is
The number of rotations of the wiping-removal rotor 20 while the woven fabric 22 is in sliding contact with the coated portion 3a of the intermittently coated belt-shaped substrate 2 is 1
When the wiping and removing device 10 is controlled to be no more than twice, the frictional force with which the woven fabric 22 provided on the peripheral surface of the wiping and removing rotor 20 slidably contacts the uncoated portion 15 of the strip-shaped substrate 2 is reduced. Therefore, it is difficult to completely wipe and remove the coating liquid scattered matter 3b attached to the uncoated portion 15.

On the other hand, the number of rotations of the wiping-removal rotor 20 is 25 times the number of rotations of the wiping-removal rotor 20 while the woven fabric 22 is in sliding contact with the coating portion 3a of the intermittently coated band-shaped substrate 2.
If the control is made to be larger than 0 times, the wiping and removing device 10
Then, the woven cloth 22 provided on the peripheral surface of the wiping-removal rotor 20 is applied to the uncoated portion 15 of the intermittently coated band-shaped base material 2.
Since the frictional force for sliding contact of the belt-like base material 2 becomes excessive, there is a possibility that the strip-shaped base material 2 exposed at the uncoated portion 15 may be damaged and cut.

Therefore, in the wiping and removing apparatus 10,
Wiping removal while the woven fabric 22 is in sliding contact with the coated portion 3a of the belt-shaped base material 2, and wiping removal while the woven fabric 22 is in sliding contact with the uncoated portion 15 of the belt-shaped base material 2. Rotor 2
By setting the number of rotations of 0 to be greater than 1 and less than or equal to 250 times, the woven fabric 2
The frictional force for sliding contact of the coating material 2 becomes good, and the coating liquid scattered matter 3b attached to the uncoated portion 15 is appropriately wiped and removed, and the strip-shaped base material 2 exposed at the uncoated portion 15 is cut. Etc. can be prevented. As a result, in the wiping and removing apparatus 10, waste of the coating liquid 3, the strip-shaped base material 2, and the like is eliminated.
The yield and productivity of the intermittently coated band-shaped substrate 2 can be greatly improved. Further, in the wiping and removing apparatus 10, the number of rotations of the wiping and removing rotor 20 while the woven fabric 22 containing the abrasive grains is in sliding contact with the uncoated portion 15 of the belt-shaped substrate 2 becomes larger than 20 rpm and 5000 rpm. The wiping removal rotor 20 is controlled by the rotation control unit as follows.
Is preferably controlled.

Here, the rotation speed of the wiping removal rotor 20 is
The uncoated portion 15 of the band-shaped substrate 2 on which the woven fabric 22 is intermittently coated
When it is controlled so as to be 20 rpm or less during sliding contact with the wiping and removing device 10, the uncoated portion 1 of the belt-shaped substrate 2 is
5, since the frictional force of the woven fabric 22 provided on the peripheral surface of the wiping removal rotor 20 in sliding contact decreases, the coating liquid scattered matter 3b attached to the uncoated portion 15 is completely wiped and removed. It will be difficult to do.

On the other hand, if the number of revolutions of the wiping and removing rotor 20 is controlled to be larger than 5000 rpm while the woven fabric 22 is in sliding contact with the coating portion 3a of the intermittently coated band-like substrate 2, the wiping and removing is performed. In the device 10, the frictional force that causes the woven fabric 22 provided on the peripheral surface of the wiping-removal rotor 20 to slidably contact the uncoated portion 15 of the intermittently coated band-shaped substrate 2 becomes excessive, There is a possibility that the strip-shaped substrate 2 exposed at the uncoated portion 15 may be damaged and cut.

Therefore, in the wiping and removing apparatus 10,
By setting the rotation speed of the wiping-removal rotor 20 while the woven fabric 22 is in sliding contact with the uncoated portion 15 of the belt-shaped substrate 2 to be greater than 20 rpm and 5000 rpm or less, the uncoated portion of the belt-shaped substrate 2 is The frictional force for sliding the woven fabric 22 against the portion 15 becomes good, and the coating liquid scattered matter 3 attached to the uncoated portion 15 is improved.
In addition to appropriately wiping and removing b, it is possible to prevent the strip-shaped base material 2 exposed at the uncoated portion 15 from being cut or the like. As a result, in the wiping and removing apparatus 10, the coating liquid 3 and the band-shaped base material 2 are not wasted, and the yield and productivity of the band-shaped base material 2 intermittently coated can be greatly improved.

In the electrode manufacturing apparatus 1 described above,
The strip-shaped base material 2 from which the coating liquid scattered matter 3b attached to the uncoated portion 15 is appropriately wiped and removed by the wiping and removing device 10 is wound up by the winding roll 5. Then, the band-shaped substrate 2 wound by the winding roll 5 is removed from the electrode manufacturing apparatus 1, and the uncoated portion 1 is removed in a subsequent cutting step.
An electrode is obtained by cutting every five. Then, a battery element is formed using the electrodes and sealed in a battery can or the like together with, for example, an electrolytic solution or the like, whereby a lithium ion secondary battery can be manufactured.

In this lithium ion secondary battery, an electrolytic solution obtained by dissolving an electrolyte conventionally used for a non-aqueous electrolyte secondary battery in a non-aqueous solvent conventionally used for a non-aqueous electrolyte secondary battery is used. The non-aqueous solvent is a solvent having a high dielectric constant, for example, propylene carbonate, ethylene carbonate, butylene carbonate, γ-butyl lactone, dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate and the like are suitable. Alternatively, two or more kinds are mixed and used. When the conductive ion is lithium as in a lithium ion secondary battery, for example, LiClO ₄ , LiAsF
₆ , LiPF ₄ , LiBF ₄ , LiCl, CH ₃ SO ₃
Li or the like is preferable, and these electrolytes are used alone or in combination of two or more. In addition, this lithium ion secondary battery has other members constituting the battery, for example, a separator, a positive temperature (PTC).
The coefficient element and the like are not necessarily limited, and may be any element that is used in a conventional lithium ion secondary battery. The shape of the lithium ion secondary battery is not necessarily limited, and may be, for example, a cylinder, a square, a coin, a button, or the like.

In the lithium ion secondary battery configured as described above, the uncoated portion 15 of the belt-shaped substrate 2 is a portion where the current collecting terminal is welded. For this reason, in this lithium ion secondary battery, at the time of charging and discharging, since the coating liquid scattered matter 3b at the portion where the current collecting terminal is welded is appropriately wiped and removed, the metallic lithium at this portion is removed. Precipitation is suppressed, and the occurrence of an internal short circuit can be suppressed.

Therefore, by using the wiping and removing apparatus 10 according to the present invention, it is possible to manufacture a high quality lithium ion secondary battery in which occurrence of an internal short circuit is suppressed.

[0073]

Hereinafter, an embodiment in which an electrode and a lithium ion secondary battery are actually manufactured using the above-described electrode manufacturing apparatus 1 will be described. Further, a comparative example manufactured for comparison with these examples will be described.

<Example 1> In Example 1, in order to produce a positive electrode, first, LiCoO ₂ was used as a positive electrode active material.
Parts by weight, 30 parts by weight of polyvinylidene fluoride resin (NV = 5%) as a binder, 26 parts by weight of graphite as a conductive agent, and N-methyl-2-pyrrolidone (hereinafter referred to as NMP) as a solvent. ) And kneading and dispersion with a planetary mixer to produce a positive electrode coating solution.

Next, using the coating device 8 of the electrode manufacturing device 1, the positive electrode coating solution is intermittently coated on one main surface of the strip-shaped base material 2 made of aluminum foil having a thickness of 20 μm and running at 150 m / min. .

Next, the solvent contained in the positive electrode coating solution intermittently coated on one main surface of the belt-shaped substrate 2 is dried using the drying device 9 of the electrode manufacturing device 1.

Next, using the wiping and removing apparatus 10 to which the present invention of the electrode manufacturing apparatus 1 is applied, the woven fabric 22 containing abrasive grains provided on the peripheral surface of the By sliding along the direction, the coating liquid scattered matter 3b attached to the uncoated portion 15 of the strip-shaped base material 2 is wiped off and removed.

At this time, the material of the abrasive grains is Al ₂ O ₃ ,
The particle size of the abrasive grains was 5 μm, the number of revolutions of the wiping removal rotor 20 was 2500 rpm, and the pushing amount of the woven fabric 22 into the uncoated portion 15 was 2000 μm.

Next, using the coating apparatus 8, the positive electrode coating liquid is also intermittently coated on the other main surface side of the belt-shaped substrate 2 so that the total thickness becomes 180 μm.

Next, after the positive electrode coating solution intermittently applied to the belt-shaped substrate 2 is dried by using the drying device 9, one main surface of the band-shaped substrate 2 is dried by using the wiping and removing device 10. The scattered coating liquid 3b adhering to the uncoated portion 15 on the other main surface side of the belt-shaped base material 2 is wiped off in the same manner as the condition applied to the side.

Next, in a cutting step, the belt-shaped substrate 2 having the main surface coated with the positive electrode coating solution intermittently is cut at each uncoated portion 15. A positive electrode was produced as described above.

Next, to prepare a negative electrode, 100 parts by weight of graphite as a negative electrode active material, 4 parts by weight of oxalic acid as an additive, and polyvinylidene fluoride resin (NV = 5% ) And NM as a solvent
20 parts by weight of P is added and kneaded and dispersed by a planetary mixer to prepare a negative electrode coating solution.

Next, using the coating device 8,
Base material 2 made of copper foil with a thickness of 10 μm running at a speed
A negative electrode coating solution is intermittently applied on one main surface of the substrate.

Next, the solvent contained in the negative electrode coating liquid intermittently coated on one main surface of the belt-shaped substrate 2 is dried using the drying device 9 described above.

Next, using the wiping and removing apparatus 10, the woven cloth 22 containing abrasive grains provided on the peripheral surface of the wiping and removing rotor 20 is slid in the width direction of the belt-shaped base material 2 by sliding. The coating liquid scattered matter 3b attached to the uncoated portion 15 of the belt-shaped substrate 2 is wiped off and removed.

At this time, in the wiping and removing apparatus 10, the particle size of the abrasive grains, the number of rotations of the wiping and removing rotor 20,
In the same manner as in the case of the positive electrode, the amount of the woven fabric 22 pushed into the coating liquid 5 was wiped off the coating liquid scattered matter 3b.

Next, using the coating device 8, the negative electrode coating liquid is also intermittently coated on the other main surface side of the belt-shaped substrate 2 so that the total thickness becomes 150 μm.

Next, after the negative electrode coating solution intermittently applied to the belt-shaped substrate 2 is dried by using the drying device 9, one main surface of the belt-shaped substrate 2 is dried by using the wiping and removing device 10. The scattered coating liquid 3b adhering to the uncoated portion 15 on the other main surface side of the belt-shaped base material 2 is wiped off in the same manner as the condition applied to the side.

Next, in a cutting step, the band-shaped substrate 2 having the negative electrode coating liquid intermittently coated on both main surfaces is cut at each uncoated portion 15. A negative electrode was manufactured as described above.

Next, a battery element is produced using the produced positive electrode and negative electrode to produce a lithium ion secondary battery.

Next, the produced battery element is sealed in a battery can together with the electrolytic solution. As described above, a lithium ion secondary battery was manufactured.

In the following description, for convenience, the positive electrode and the negative electrode are collectively referred to as an electrode, and the lithium ion secondary battery is simply referred to as a battery.

<Embodiment 2> In Embodiment 2, in the wiping and removing apparatus 10 to which the present invention is applied, the particle size of the abrasive grains is set to 10 μm.
The rotation speed of the wiping removal rotor 20 is 3000 rpm,
The pushing amount of the woven fabric 22 into the uncoated portion 15 is 30
An electrode and a battery were produced in the same manner as in Example 1 except that the thickness was set to 00 μm.

<Embodiment 3> In Embodiment 3, in the wiping and removing apparatus 10 to which the present invention is applied, the particle size of the abrasive grains is 15 μm.
The rotation speed of the wiping removal rotor 20 is set to 3500 rpm, and the pushing amount of the woven fabric 22 into the uncoated portion 15 is set to 400.
An electrode and a battery were produced in the same manner as in Example 1 except that the thickness was set to 0 μm.

<Embodiment 4> In Embodiment 4, in the wiping and removing apparatus 10 to which the present invention is applied, the grain size of the abrasive grains is set to 20 μm.
The rotation speed of the wiping-removal rotor 20 is set to 4000 rpm, and the pushing amount of the woven fabric 22 into the uncoated portion 15 is set to 500.
An electrode and a battery were produced in the same manner as in Example 1 except that the thickness was set to 0 μm.

<Embodiment 5> In Embodiment 5, in the wiping and removing apparatus 10 to which the present invention is applied, the particle size of the abrasive grains is 25 μm.
The rotation speed of the wiping-removal rotor 20 is 5000 rpm, and the pushing amount of the woven fabric 22 into the uncoated portion 15 is 500
An electrode and a battery were produced in the same manner as in Example 1 except that the thickness was set to 0 μm.

<Comparative Example 1> In Comparative Example 1, instead of the wiping and removing apparatus 10 to which the present invention is applied, a conventional wiping and removing apparatus in which a brush is provided on the peripheral surface of a wiping and removing rotor is used.
An electrode and a battery were produced in the same manner as in Example 1, except that the number of revolutions of the wiping-removal rotor was set to 2000 rpm and the amount of pushing the woven fabric into the uncoated portion was set to 1000 μm.

<Comparative Example 2> In Comparative Example 2, instead of the wiping and removing apparatus 10 to which the present invention is applied, a wiping and removing apparatus in which a woven cloth containing no abrasive grains is provided on the peripheral surface of the wiping and removing rotor is used. An electrode and a battery were produced in the same manner as in Example 1, except that the number of revolutions of the wiping-removal rotor was set to 2000 rpm and the amount of pushing the woven fabric into the uncoated portion was set to 1000 μm.

Comparative Example 3 In Comparative Example 3, in the wiping and removing apparatus 10 to which the present invention was applied, the grain size of the abrasive grains was 25 μm.
The rotation speed of the wiping-removal rotor 20 is set to 6000 rpm, and the pushing amount of the woven fabric 22 into the uncoated portion 15 is set to 500.
An electrode and a battery were produced in the same manner as in Example 1 except that the thickness was set to 0 μm.

Using the electrodes of Examples 1 to 5 and Comparative Examples 1 to 3 manufactured as described above,
The number of coating liquid splatters adhering to the uncoated portion was examined. Also,
Using the batteries of these Examples and Comparative Examples, the charge voltage drop failure rate at the time of the first charge was examined.

Table 1 below shows the number of scattered coating liquids in the uncoated portions of the electrodes of each of the examples and comparative examples, and the evaluation results of the charging voltage drop failure rates of the batteries of each of the examples and comparative examples. Show.

[0102]

[Table 1]

In Table 1, the items of the number of coating liquid splatters in the uncoated portion are those in which one main surface is intermittently coated first and the other main surface is intermittently coated later. As a side, the result of visually examining the number of coating liquid scattered matters in the uncoated portion of the electrode is shown.

In the item of charging voltage drop defect rate, the percentage of batteries having a voltage drop defect after charging the manufactured battery is displayed as a percentage. This indicates that the occurrence rate is high. In order to evaluate the voltage drop failure of the battery, first, the manufactured battery is aged for 12 hours under a general environment (temperature: 25 ° C., humidity: 60%). Next, the aged battery is
The battery is charged to 4.25 V under a constant current condition of mA. next,
The voltage of the charged battery is measured after 4 hours. Next, after storing the charged battery for 30 days, the voltage is measured again. At this time, a battery having a voltage drop of 10% or more with respect to the voltage 4 hours after the completion of charging was determined to have a voltage drop failure. The battery voltage drop defect was evaluated as described above.

From the evaluation results shown in Table 1, in the electrodes of Examples 1 to 5, the number of the coating liquid splatters 3b adhering to the uncoated portion 15 indicates that the brush is provided on the peripheral surface of the wiping removal rotor. It can be seen that the number is smaller on both main surfaces compared to the electrode of Comparative Example 1 using the conventional wiping and removing apparatus.

In the electrode of Comparative Example 1, the brush was linearly slid on the strip-shaped substrate by using the conventional wiping and removing device in which the brush was provided on the peripheral surface of the wiping and removing rotor. Since a gap is formed between the brush and the brush to make sliding contact, it is difficult to completely wipe and remove the scattered coating liquid attached to the uncoated portion.

On the other hand, in the electrodes of Examples 1 to 5, the wiping and removing apparatus 10 to which the present invention is applied is used.
Since the woven fabric 22 containing abrasive grains provided on the peripheral surface of the wiping-removal rotor 20 is brought into sliding contact with the belt-shaped base material 2 by surface contact, that is, in close contact with no gap, the uncoated portion 15 It is possible to appropriately wipe and remove the coating liquid flying object 3b attached to the surface. Thus, it is considered that the number of the coating liquid flying objects 3b was significantly reduced as compared with the comparative example 1.

Also, from the evaluation results shown in Table 1, the results of Example 1 were obtained.
In addition, it can be seen that the charge voltage drop failure rate of the batteries of Example 5 is smaller than that of the battery of Comparative Example 1.

In the battery of Comparative Example 1, since the battery was manufactured using the electrode from which the scattered coating liquid was not completely wiped off, metallic lithium was deposited at the portion where the current collecting terminal was welded. It is considered that the internal short circuit caused by the deposition of metallic lithium caused the charging voltage drop failure rate to increase.

On the other hand, in the batteries of Examples 1 to 5, the batteries were manufactured using the electrodes from which the above-mentioned coating liquid splatters 3b were appropriately wiped and removed. It is considered that the internal short circuit could be suppressed, and the charging voltage drop failure rate was reduced.

Further, from the evaluation results shown in Table 1, the results of Example 1 were obtained.
In the electrodes of Examples 5 to 5, the number of the coating liquid splatters 3b adhering to the uncoated portion 15 was smaller than that of the electrode using the wiping and removing device provided with a woven cloth containing no abrasive particles on the peripheral surface of the wiping and removing rotor. It can be seen that, compared to the electrode of Example 2, there is less on both principal surfaces.

In the electrode of Comparative Example 2, the wiping and removing device in which the woven cloth containing no abrasive grains was provided on the peripheral surface of the wiping and removing rotor was used to scrape off the scattered coating liquid adhering to the uncoated portion. And it is difficult to completely wipe and remove.

On the other hand, in the electrodes of Examples 1 to 5, the wiping / removing device 10 in which the woven cloth 22 containing abrasive particles is provided on the peripheral surface of the wiping / removing rotor 20 is used. Can scrape off the coating liquid splatter 3b adhering to the uncoated portion 15 and appropriately wipe and remove it. Thus, it is considered that the number of the coating liquid flying objects 3b was suppressed as compared with Comparative Example 2.

Further, from the evaluation results shown in Table 1, the results of Example 1 were obtained.
In addition, it can be seen that the batteries of Example 5 have a lower charging voltage drop failure rate than the battery of Comparative Example 2.

[0115] In the battery of Comparative Example 2, since the battery was manufactured using the electrode which was not completely wiped off because the coating liquid splattered substance was not scraped, metallic lithium was deposited at the portion where the current collecting terminal was welded. However, it is considered that the internal short circuit caused by the deposition of the metallic lithium caused the charging voltage drop failure rate to increase.

On the other hand, in the batteries of Examples 1 to 5, the batteries were manufactured using the electrodes from which the coating liquid scattered matter 3b was appropriately wiped and removed by the woven fabric 22 containing the abrasive grains. From this, it is considered that the internal short circuit due to the deposition of metallic lithium can be suppressed, and the charging voltage drop failure rate has decreased.

As described above, when the coating liquid scattered matter 3b attached to the uncoated portion 15 of the belt-shaped base material 2 is wiped off and removed, the woven fabric 22 containing abrasive grains is used to remove the coating liquid scattered matter 3b. It has been found that wiping and removing the coating liquid splatter 3b attached to the coating portion 15 is very effective in producing a lithium ion secondary battery.

Further, from the evaluation results shown in Table 1, Comparative Example 3
In this case, since the rotation speed of the wiping-removal rotor 20 was set to 6000 rpm, the frictional force for sliding the woven fabric 22 against the uncoated portion 15 of the strip-shaped base material 2 became excessive, and the strip-shaped base material 2 was uncoated. In contrast to the cutting at 15, in the first to fifth embodiments, the rotation speed of the wiping removal rotor 20 is set to be higher than 20 rpm, which is preferable, and 500 rpm.
It is in the range of 0 rpm or less.

As described above, in the electrodes of the first to fifth embodiments, in the wiping removal rotor 20 to which the present invention is applied,
The rotation speed of the wiping removal rotor 20 is set to 2500 rpm to 50
By setting it to the range of 00 rpm, the frictional force for sliding the woven fabric 22 against the uncoated portion 15 of the belt-shaped base material 2 becomes good, and the coating liquid scattered matter 3b attached to the uncoated portion 15 is appropriately wiped. It is possible to prevent the strip-shaped base material 2 from being cut while removing it.

[0120]

As described above, in the wiping and removing apparatus according to the present invention, the wiping and removing means slides the woven fabric containing abrasive grains on the belt-shaped base material traveled by the traveling means. The coating liquid adhering to the uncoated portion of the belt-shaped substrate can be appropriately wiped off and removed. Therefore, it is possible to greatly improve the yield and quality of the band-shaped substrate on which the coating liquid is intermittently applied.

Further, according to the present method, the excess coating liquid adhering to the uncoated portion can be appropriately wiped and removed by sliding the woven cloth containing abrasive grains into sliding contact with the running belt-like base material. . Therefore, the yield and quality of the band-shaped substrate on which the coating liquid is intermittently applied can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of an electrode manufacturing apparatus.

FIG. 2 is a schematic sectional view showing one configuration example of a coating apparatus.

FIG. 3 is a schematic plan view showing a state where a coating liquid is intermittently applied on a main surface of a belt-shaped base material.

FIG. 4 is a schematic side view showing one configuration example of a wiping and removing apparatus to which the present invention is applied.

FIG. 5 is a schematic sectional view of the wiping-removal rotor taken along line EE ′ in FIG. 4;

FIG. 6 is a schematic sectional view showing one configuration example of a coating apparatus.

FIG. 7 is a schematic plan view showing a state in which a coating liquid is intermittently applied on a main surface of a belt-shaped base material.

FIG. 8 is a schematic side view showing one configuration example of a conventional wiping and removing apparatus.

FIG. 9 is a schematic sectional view of the wiping-removal rotor taken along line TT ′ in FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electrode manufacturing apparatus, 2 strip-shaped base material, 3 coating liquid, 3a coating part, 3b coating liquid scattered matter, 8 coating apparatus, 9 drying apparatus, 10 wiping removal apparatus, 11 die head, 12 backup roll, 13 shutter, 14 Blade, 15 uncoated part, 20 Wiping removal rotor, 21
Backup roll, 22 woven cloth

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 4D075 AC84 BB20Z BB24Z CA23 DA04 DB06 DB07 DC18 EB01 EB17 EC01 4F042 AA22 BA05 BA08 CC09 DC00 DF23 5H050 AA19 BA17 CA07 CA08 CA09 CB07 DA02 DA03 FA05 FA16 GA04 GA12 GA22 GA29 HA29

Claims (20)

[Claims] 1. A running means for running a band-shaped substrate intermittently coated with a coating liquid at a predetermined interval, and a sliding means for sliding the belt-shaped base material traveled by the running means. Wiping and removing means for wiping and removing the coating liquid adhered to the coating portion, wherein the wiping and removing means has a woven cloth containing abrasive grains, and the strip is moved by the running means. A wiping and removing apparatus characterized by wiping and removing a coating liquid adhering to an uncoated portion of the belt-shaped substrate by slidingly contacting the substrate. 2. The wiping and removing means includes a rotor having the woven fabric provided on a peripheral surface thereof, and while rotating the rotor, slides the woven fabric on the band-shaped base material traveled by the traveling means. 2. The wiping and removing apparatus according to claim 1, wherein the coating liquid attached to the uncoated portion of the strip-shaped base material is wiped and removed by being brought into contact. 3. A rotor control means for controlling the number of rotations of the rotor, wherein the rotor control means controls the number of rotations of the rotor while the woven fabric is in sliding contact with the coated portion of the strip-shaped base material. 3. The wiping method according to claim 2, wherein the rotation speed of the rotor is controlled so that the rotation speed of the rotor increases while the woven fabric is in sliding contact with the uncoated portion of the strip-shaped base material. Removal device. 4. The apparatus according to claim 1, wherein the woven cloth is provided on an uncoated portion of the belt-shaped base material with respect to a rotation speed of the rotor while the woven fabric slides on the coated portion of the band-shaped base material. 4. The wiping and removing apparatus according to claim 3, wherein the number of rotations of the rotor is controlled so that the number of rotations of the rotor during sliding contact with the rotor is greater than 1 and less than or equal to 250 times. 5. The rotor control means according to claim 1, wherein the rotation speed of the rotor while the woven fabric is in sliding contact with the uncoated portion of the band-shaped base material is larger than 20 rpm, and 5000 rpm.
The wiping and removing apparatus according to claim 3, wherein the number of rotations of the rotor is controlled as follows. 6. The wiping and removing apparatus according to claim 1, wherein the coating liquid contains an electrode active material. 7. The wiping and removing apparatus according to claim 1, wherein the woven fabric is made of nylon fibers. 8. The wiping and removing apparatus according to claim 1, wherein the material of the abrasive grains is Al ₂ O ₃ . 9. The abrasive grain has a particle size of 5 μm or more, and
The wiping and removing apparatus according to claim 1, wherein the wiping and removing apparatus has a thickness of 25 µm or less. 10. The wiping and removing apparatus according to claim 1, wherein said traveling means travels said strip-shaped base material at a speed of 1 m / min or more and 150 m / min or less. 11. A woven cloth containing abrasive grains is removed by wiping and removing a coating liquid adhering to an uncoated portion of a band-shaped substrate to which a coating liquid has been intermittently applied at predetermined intervals. While sliding on the material,
A wiping and removing method comprising wiping and removing a coating liquid attached to an uncoated portion of the belt-shaped substrate. 12. The woven cloth adheres to an uncoated portion of the strip-shaped base material by sliding the woven cloth against the running strip-shaped base material while rotating a rotor provided on the peripheral surface. The coating liquid is wiped off and removed.
The wiping removal method described. 13. The rotation speed of the rotor while the woven fabric is in sliding contact with the coated portion of the strip-shaped substrate, and the rotation speed of the woven fabric is in sliding contact with an uncoated portion of the strip-shaped substrate. 13. The wiping and removing method according to claim 12, wherein the rotation speed of the rotor is increased. 14. The rotation speed of the rotor while the woven fabric is in sliding contact with the coated portion of the belt-shaped substrate, and the rotation of the woven fabric is in sliding contact with the uncoated portion of the belt-shaped substrate. 14. The wiping and removing method according to claim 13, wherein the number of rotations of the rotor is set to be more than 1 and not more than 250 times. 15. The rotating speed of the rotor while the woven fabric is in sliding contact with an uncoated portion of the strip-shaped substrate is set to be greater than 20 rpm and equal to or less than 5000 rpm. Wiping removal method. 16. The wiping and removing method according to claim 11, wherein said coating liquid contains an electrode active material. 17. The wiping and removing method according to claim 11, wherein a nylon fiber is used as the woven fabric. 18. The wiping and removing method according to claim 11, wherein Al ₂ O ₃ is used as said abrasive grains. 19. The wiping and removing method according to claim 11, wherein the particle size of the abrasive grains is 5 μm or more and 25 μm or less. 20. The wiping and removing method according to claim 11, wherein the traveling speed of the strip-shaped substrate is set to 1 m / min or more and 150 m / min or less.