KR20240043607A - Electrode manufacturing method and electrode manufacturing apparatus for secondary battery - Google Patents

Abstract

The present invention relates to a method for manufacturing electrodes for secondary batteries and an electrode manufacturing apparatus for secondary batteries. The method for manufacturing electrodes for secondary batteries according to the present invention includes a single-side coating step of coating an electrode active material slurry on one side of an electrode current collector through a coating portion; And after the one-side coating step, the electrode current collector is inverted to position the other side of the electrode current collector to face upward, and a second side coating step of coating the other side of the electrode current collector with an electrode active material slurry through a coating portion. , It further includes a flattening step of applying an external force to at least one end in the width direction of the electrode current collector through a flattening means during the other surface coating step to flatten the electrode current collector.

Description

Electrode manufacturing method and electrode manufacturing apparatus for secondary battery}

The present invention relates to a method for manufacturing electrodes for secondary batteries and an apparatus for manufacturing electrodes for secondary batteries.

Unlike primary batteries, secondary batteries can be recharged and have been extensively researched and developed in recent years due to their small size and high capacity. As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.

Secondary batteries are classified into coin-shaped batteries, cylindrical batteries, square-shaped batteries, and pouch-shaped batteries, depending on the shape of the battery case. In a secondary battery, the electrode assembly mounted inside the battery case is a power generating element capable of charging and discharging consisting of a stacked structure of electrodes and a separator.

The electrode assembly is a jelly-roll type wound with a separator interposed between a sheet-like anode and a cathode coated with an active material, and includes unit cells in which at least one electrode and at least one separator are stacked. It can be roughly classified into a stack type in which the cells are sequentially stacked, and a stack/folding type in which unit cells are wound with a long length of separation film.

Electrodes for secondary batteries include an electrode current collector and an electrode active material coated on one or both sides of the electrode current collector.

When manufacturing electrodes for secondary batteries by coating the electrode active material slurry on the electrode current collector, the top side and back side of the electrode current collector are separated, and when the top side is coated first, the edge is formed due to the fluidity of the slurry. ) The coating shape of the part becomes thinner than the central part, and as a result, the edge part of the back surface is turned off, and there is a problem in that the edge part of the back surface of the electrode becomes relatively thick.

Therefore, when the edge of the electrode becomes thick, there is a risk that lithium may precipitate in the surrounding area due to the difference in porosity of the area, so it is necessary to improve the edge to obtain a uniform thickness compared to the center when coating the back surface.

One aspect of the present invention is to provide a method for manufacturing electrodes for secondary batteries and an electrode manufacturing apparatus for secondary batteries that can manufacture electrodes of uniform thickness by flattening the electrodes.

A method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention includes a single-side coating step of coating an electrode active material slurry on one side of an electrode current collector; And after the one-side coating step, the other side coating step includes inverting the electrode current collector so that the other side of the electrode current collector faces upward, and coating the other side of the electrode current collector with an electrode active material slurry, wherein the other side is During the coating step, a flattening step of applying an external force to at least one end of the electrode current collector in the width direction through a flattening means to flatten the electrode current collector may be further included.

In addition, the apparatus for manufacturing an electrode for a secondary battery according to an embodiment of the present invention includes a coating unit for coating the upper part of the electrode current collector by applying an electrode active material slurry; and a flattening unit that applies an external force to at least one end of the electrode current collector in the width direction to flatten it, wherein the coating portion applies the electrode active material slurry to one surface of the electrode current collector, then inverts and moves upward. The electrode active material slurry may be applied to the other surface of the electrode current collector positioned to face.

According to the present invention, when manufacturing an electrode by coating both sides of the electrode current collector with an electrode active material slurry, an external force can be applied to the width direction end of the electrode current collector through a flattening means to flatten the electrode current collector. In particular, when one side of the electrode current collector is coated and then reversed to coat the other side, when the width direction end of the electrode current collector is bent downward, it is flattened through a flattening means, so that the width direction end of the electrode current collector is bent downward. By preventing burnout and preventing the electrode active material slurry from being thickly coated in the width direction of the electrode current collector, an electrode of uniform thickness can be manufactured. Accordingly, it is possible to prevent the problem of lithium precipitating due to the thickening of the end of the electrode.

1 is a flowchart showing a method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention.
Figure 2 is a side view showing the one-side coating step of the method for manufacturing electrodes for secondary batteries according to an embodiment of the present invention.
Figure 3 is a front view showing a state in which an electrode active material slurry is coated on one side of an electrode in the one-side coating step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention.
Figure 4 is a side view showing the other side coating step and planarization step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention.
Figure 5 is a front view showing a state before flattening the end of the electrode current collector in the planarization step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention.
Figure 6 is a front view showing the state after flattening the end of the electrode current collector in the planarization step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention.

The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when adding reference numbers to components in each drawing, it should be noted that identical components are given the same number as much as possible even if they are shown in different drawings. Additionally, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Also, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

Method for manufacturing electrodes for secondary batteries according to examples

Figure 1 is a flowchart showing a method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention, Figure 2 is a side view showing a single-side coating step of a method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention, and Figure 3 is a flowchart showing a method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention. It is a front view showing a state in which an electrode active material slurry is coated on one side of an electrode in the one-side coating step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention, and Figure 4 shows the other side coating step and the other side coating step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention. This is a side view showing the flattening stage.

Referring to Figures 1 to 4, the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention includes a single-side coating step (S10) of coating an electrode active material slurry 20 on one side 11 of the electrode current collector 10 and It includes a surface coating step (S50) of coating the electrode active material slurry 30 on the other surface 12 of the electrode current collector 10, and during the other surface coating step (S50), the electrode current collector 10 is flattened by applying an external force. A flattening step (S60) may be further included.

In addition, the method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention may further include a detection step, a control step, a winding step (S30), a supply step (S40), and a drying step (S20).

In more detail, referring to FIGS. 1 to 3, the one-side coating step (S10) may be performed by coating the electrode active material slurry 20 on one side 11 of the electrode current collector 10 through the coating portion 110. At this time, the electrode current collector 10 may be wound around the current collector roll R1, unwound, and supplied toward the coating portion 110.

In the one-side coating step (S10), the electrode active material slurry 20 is applied to the electrode current collector 10 except for the end portions 10a on both sides in the width direction of the electrode current collector 10, A holding area (T) to which the active material slurry 20 is applied and a non-coating area (N) to which the electrode active material slurry 20 is not applied may be formed.

Meanwhile, the electrode active material slurry 20 may include, for example, an electrode active material, a binder, and a conductive material.

In the drying step (S20), before the other side coating step (S50), the electrode active material slurry 20 coated on one side 11 of the electrode current collector 10 through the one side coating step (S10) is dried through the drying unit 130. It can be dried. At this time, in the drying step (S20), the electrode active material slurry 20 may be semi-dried or completely dried.

Additionally, the drying step (S20) may be performed before the winding step (S30), for example. Here, the drying step (S20) may be performed by applying heat to the electrode active material slurry 20 coated on one side 11 of the electrode current collector 10 through the drying unit 130 including a heater to dry it.

Meanwhile, the drying step (S20) can be performed after the winding step (S30), as another example. Here, in the drying step (S20), the electrode current collector 10 wound on the winding roll (R2) in the winding step (S30) is accommodated in a vacuum-type drying unit including a chamber and a vacuum means, thereby forming the electrode current collector 10. The electrode active material slurry 20 coated on one surface 11 can be vacuum dried.

In the winding step (S30), the electrode current collector 10 coated with the electrode active material slurry 20 on one side 11 through the one-side coating step (S10) may be wound on the winding roll R2.

Referring to Figures 1 and 4, in the supply step (S40), the electrode current collector 10 wound on the winding roll (R2) is unwound and supplied to the coating unit 110 after the winding step (S30), and the electrode active material slurry ( The electrode current collector 10 may be supplied so that the other side 12 of the electrode current collector 10 that is not coated 20 is facing upward.

In the other side coating step (S50), after the one side coating step (S10), the electrode current collector 10 is reversed and the other side 12 of the electrode current collector 10 is positioned to face upward, and the electrode current collector 10 is positioned so that the other side 12 is facing upward. The electrode active material slurry 30 may be coated on the other surface 12 through the coating portion 110. Here, the coating portion 110 used in the other side coating step (S50) may be the same as or different from the coating portion 110 used in the one side coating step (S10). That is, the coating portion 110 used in the other side coating step (S50) may use the coating portion 110 used in the one side coating step (S10), and the coating portion 110 used in the other side coating step (S50) may be used. You can use it by additionally installing it.

In addition, the other side coating step (S50) applies the electrode active material slurry 30 to the electrode current collector 10 except for the ends 10a on both sides in the width direction of the electrode current collector 10, thereby forming the electrode current collector 10. A holding region (T) to which the electrode active material slurry 30 is applied and a non-coating region (N) to which the electrode active material slurry 30 is not applied can be formed.

Meanwhile, the electrode 1 coated with the electrode active material slurry 20 and 30 on both sides of the electrode current collector 10 through the other side coating step can be wound around the electrode roll R3.

Meanwhile, the one-side coating step (S10) and the other side coating step (S50) may include a transfer process in which the electrode current collector 10 is transferred through the transfer means 120.

The transfer means 120 may include a plurality of transfer rollers. The outer surface of the transfer roller is in contact with the electrode current collector 10 or the electrode active material slurry 20, and as the transfer roller rotates, the electrode current collector 10 is transferred in the traveling direction (G), which is the X-axis direction in FIG. 2. You can. Here, a plurality of transfer rollers are located toward the bottom of the electrode current collector 10, but some of them may be located toward the top of the electrode current collector 10.

In the transfer process, the lower surface of the electrode current collector 10 can be supported and transferred through the transfer means 120 in the one-side coating step (S10). At this time, the transfer means 120 faces and contacts the lower surface of the electrode current collector 10, thereby preventing the end portion 10a of the electrode current collector 10 from sagging.

In addition, in the transfer process, the lower surface of the electrode active material slurry 20 coated on one surface 11 of the electrode current collector 10 can be supported and transferred through the transfer means 120 in the other surface coating step (S50). At this time, the transfer means 120 is brought into contact with the lower surface of the electrode active material slurry 20 coated on one surface 11 of the electrode current collector 10, thereby reducing the lower sagging of the end portion 10a of the electrode current collector 10. This may occur, and in this case, the end portion 10a of the electrode current collector 10 bent downward may be flattened through the flattening means 140.

Meanwhile, the transfer means 120 used in the other side coating step (S50) may be the same as or different from the transfer means 120 used in the one side coating step (S10). That is, the transfer means 120 used in the other side coating step (S50) may use the transfer roller used in the one side coating step (S10), or the transfer roller used in the other side coating step (S50) may be additionally installed. You can use it.

Figure 5 is a front view showing a state before flattening the end of the electrode current collector in the planarization step of the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention, and Figure 6 is a view showing a state before flattening the end of the electrode current collector according to an embodiment of the present invention. This is a front view showing the state after flattening the end of the electrode current collector in the flattening step.

Referring to FIGS. 1 and 4 to 5, the planarization step (S60) is performed by flattening the end portion (10a) of at least one side in the width direction of the electrode current collector (10) through the planarization means (140) during the other side coating step (S50). You can apply an external force to make it flat.

In the flattening step (S60), an external force may be applied to both ends 10a in the width direction, which are the uncoated regions N of the electrode current collector 10.

The flattening means 140 includes an air blower, and the flattening step (S60) flattens the bent portion by spraying air to the end 10a of the electrode current collector 10 through the air blower. You can do it.

In addition, in the flattening step (S60), an air blower is placed below the end 10a of the electrode current collector 10, and air is sprayed upward to form the end of the electrode current collector 10 that is bent downward. (10a) can be flattened by bending in the opposite direction of the bending direction.

In addition, the flattening step (S60) is performed by positioning the limiter 150 on the upper part of the end 10a of the electrode current collector 10 and spraying air from the bottom to the top. The holding area T of the electrode current collector 10 ) can be controlled so that the end portion 10a of the electrode current collector 10 is not bent further upward than the upper surface of the electrode current collector 10.

In the detection step, the presence or absence of bending or the amount of bending of the end portion 10a of the electrode current collector 10 may be detected through the detection unit 160 during the other side coating step (S50).

The detection unit 160 may be made of, for example, a vision camera sensor.

In the control step, the presence or absence of bending or the amount of bending of the end portion 10a of the electrode current collector 10 is received through the detection step, and the operation of the flattening means 140 can be controlled through the control unit 170.

In addition, in the control step, the control unit 170 receives the bending amount detection value through the detection unit 160 and does not operate the flattening means 140 when it is determined that the end portion 10a of the electrode current collector 10 is not bent. Alternatively, when it is determined that the end portion 10a of the electrode current collector 10 is bent, the flattening means 140 can be operated.

In addition, in the control step, the control unit 170 receives the bending amount detection value through the detection unit 160, and when it is determined that the bending amount of the end portion 10a of the electrode current collector 10 is small, the air blower of the flattening means 140 The intensity of the air injection can be weakened, and when it is determined that the amount of bending of the end portion 10a of the electrode current collector 10 is large, the intensity of the air injection of the air blower of the flattening means 140 can be increased. Here, in the control step, the control unit 170 compares the stored value stored in the memory with the bending amount detection value received through the detection unit 160 to determine whether the bending amount of the end portion 10a of the electrode current collector 10 is small or large. there is.

In the method of manufacturing an electrode for a secondary battery according to an embodiment of the present invention configured as described above, when manufacturing the electrode 1 by coating both sides of the electrode current collector 10 with the electrode active material slurry 20 and 30, the flattening means 140 ), an external force can be applied to the width direction end portion 10a of the electrode current collector 10 to make it flat. In particular, when coating one side 11 of the electrode current collector 10 and then inverting it to coat the other side 12, when the end portion 10a in the width direction of the electrode current collector 10 is bent downward, the flattening means 140 ), thereby preventing the width direction end portion 10a of the electrode current collector 10 from turning off, and thickly coating the electrode active material slurry 20, 30 in the width direction of the electrode current collector 10. By preventing this, the electrode 1 of uniform thickness can be manufactured. Accordingly, it is possible to prevent the problem of the end 10a of the electrode 1 becoming thick and causing lithium to precipitate.

Electrode manufacturing device for secondary batteries according to examples

Hereinafter, an apparatus for manufacturing electrodes for secondary batteries according to an embodiment of the present invention will be described.

Referring to FIGS. 1 to 4, the electrode manufacturing apparatus 100 for a secondary battery according to an embodiment of the present invention includes a coating unit 110 that coats the electrode current collector 10 with an electrode active material slurry 20 and 30; And a flattening means 140 that applies an external force to the end 10a of the electrode current collector 10 to flatten it, and the coating portion 110 is applied to the end 10a of the electrode current collector 10 by applying an electrode active material slurry to one surface 11 of the electrode current collector 10. After applying (20), the electrode active material slurry 30 can be applied to the other surface 12 of the electrode current collector 10.

In addition, the electrode manufacturing apparatus 100 for secondary batteries according to an embodiment of the present invention may further include a transfer means 120, a drying unit 130, a limiter 150, a detection unit 160, and a control unit 170. there is.

The apparatus 100 for manufacturing an electrode for a secondary battery according to an embodiment of the present invention relates to an electrode manufacturing apparatus 100 for a secondary battery used in the method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention described above. Therefore, in the present embodiment of the apparatus 100 for manufacturing an electrode for a secondary battery, content that overlaps with the embodiment of the method for manufacturing an electrode for a secondary battery described above will be omitted or briefly described, and the description will focus on the differences.

In more detail, the coating portion 110 may be coated by applying the electrode active material slurry 20 to the top of the electrode current collector 10.

In addition, the coating portion 110 is formed by applying the electrode active material slurry 20 to one side 11 of the electrode current collector 10 and then inverting the other side 12 of the electrode current collector 10 to face upward. ) can be applied to the electrode active material slurry (30).

In addition, the coating portion 110 applies the electrode active material slurry 20 and 30 to the electrode current collector 10 as it moves in the moving direction (G). Coating the electrode active material slurry (20, 30) on the electrode current collector (10) in the traveling direction (G), except for both ends (10a) of the electrode current collector (10). can do. Accordingly, a holding region (T) to which the electrode active material slurry (20, 30) is applied and a non-coating region (N) to which the electrode active material slurry (20, 30) is not applied can be formed in the electrode current collector (10). there is.

Meanwhile, the electrode 1 for a secondary battery manufactured using the electrode manufacturing apparatus 100 for a secondary battery according to an embodiment of the present invention may include an anode and a cathode.

The positive electrode may include a positive electrode current collector and a positive electrode active material slurry stacked on the positive electrode current collector.

The positive electrode current collector may be made of aluminum foil.

The positive electrode active material slurry may include, for example, a positive electrode active material, a binder, and a conductive material. The positive electrode active material may be made of, for example, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or compounds and mixtures containing one or more of these.

The negative electrode may include a negative electrode current collector and a negative electrode active material slurry laminated on the negative electrode current collector.

The negative electrode current collector may be made of a foil made of, for example, copper (Cu).

The negative electrode active material slurry may include, for example, a negative electrode active material, a binder, and a conductive material. The negative electrode active material may be a compound or mixture containing a graphite-based material.

Referring to FIGS. 4 to 6 , the flattening means 140 may apply an external force to at least one end 10a in the width direction of the electrode current collector 10 to flatten it. Here, the width direction of the electrode current collector 10 may be the Y-axis direction, for example, when referring to FIG. 5 .

In addition, the flattening means 140 applies an external force to both ends 10a, which are the uncoated areas N, of the electrode current collector 10 in the traveling direction G to form the bent ends 10a of the electrode current collector 10. can be flattened.

Meanwhile, the flattening means 140 may include an air blower.

Additionally, the air blower can spray air to the end 10a of the electrode current collector 10 to flatten the bent portion.

In addition, the air blower is located in the lower direction of the end 10a of the electrode current collector 10, and blows air from the bottom to the top to bend the end 10a of the electrode current collector 10 bent in the downward direction. It can be flattened by bending in the opposite direction. At this time, the air blower may spray air in the Z-axis direction, referring to FIG. 5 .

The limiter 150 is located at the upper part of the end 10a of the electrode current collector 10, and when air is sprayed from the bottom to the top, it is lower than the upper surface of the holding area T of the electrode current collector 10. The end portion 10a of the electrode current collector 10 can be prevented from bending further upward.

The limiter 150 may include a limiter plate 151 facing the upper surface of the end 10a of the electrode current collector 10. The limiter plate 151 has a flat lower surface and can limit the upper surface of the end portion 10a of the electrode current collector 10 from bending further than the upper surface of the holding portion T of the electrode current collector 10. When the end portion 10a of the electrode current collector 10 is reversely bent by the flattening means 140, the upper surface of the uncoated region N of the electrode current collector 10 and the holding portion of the electrode current collector 10 The upper surface of the area T can be positioned on the same plane. That is, through the limiter plate 151, the upper surface of the uncoated area (N) of the electrode current collector 10 and the upper surface of the holding area (T) of the electrode current collector 10 are aligned in the Y-axis direction in FIG. 6. can do.

The detection unit 160 can detect whether or not the end portion 10a of the electrode current collector 10 is bent or the amount of bending is moved in the traveling direction (G) during coating of the other surface 12 of the electrode current collector 10. .

The detection unit 160 may be made of, for example, a vision camera sensor.

The control unit 170 may control the operation of the flattening means 140 by receiving a detection value of the presence or absence of bending or the amount of bending of the end portion 10a of the electrode current collector 10 detected through the detection unit 160.

In addition, when the control unit 170 receives the bending amount detection value through the detection unit 160 and determines that the end portion 10a of the electrode current collector 10 is not bent, it does not operate the flattening means 140 and When it is determined that the end 10a of the current collector 10 is bent, the flattening means 140 can be operated.

In addition, the control unit 170 receives the bending amount detection value through the detection unit 160, and when it is determined that the bending amount of the end portion 10a of the electrode current collector 10 is small, the control unit 170 blows air from the air blower of the flattening means 140. The strength can be weakened, and when it is determined that the amount of bending of the end portion 10a of the electrode current collector 10 is large, the air injection strength of the air blower of the flattening means 140 can be increased. Here, the control unit 170 can determine whether the bending amount of the end portion 10a of the electrode current collector 10 is small or large by comparing the stored value stored in the memory with the bending amount detection value received through the detection unit 160.

The transport means 120 can transport the electrode current collector 10 in the traveling direction (G).

Here, the transfer means 120 can support and transfer the lower surface of the electrode current collector 10 when applying the electrode active material slurry 20 to one surface 11 of the electrode current collector 10.

In addition, when applying the electrode active material slurry 30 to the other side 12 of the electrode current collector 10, the transport means 120 applies the electrode active material slurry 20 coated on one side 11 of the electrode current collector 10. It can be transported while supporting the lower surface of the machine.

The transfer means 120 may include a plurality of transfer rollers. The outer surface of the transfer roller is in contact with the electrode current collector 10 or the electrode active material slurry 20, and as the transfer roller rotates, the electrode current collector 10 can be transferred in the traveling direction (G). Here, a plurality of transfer rollers are located toward the bottom of the electrode current collector 10, but some of them may be located toward the top of the electrode current collector 10.

Meanwhile, the apparatus 100 for manufacturing electrodes for secondary batteries according to an embodiment of the present invention may further include a current collector roll (R1), a winding roll (R2), and an electrode roll (R3).

The electrode current collector 10 is wound around the current collector roll R1, and when one side of the electrode current collector 10 is coated, the winding is unwound and the electrode current collector 10 can be supplied in the direction of the coating portion 110.

After coating one side 11 of the electrode current collector 10, the winding roll R2 can wind the electrode current collector 10 coated with the electrode active material slurry 20 on one side 11 on the winding roll R2. there is. When coating the other surface 12 of the electrode current collector 10, the electrode current collector 10 wound on the winding roll R2 is applied to the other surface 12 of the electrode current collector 10 that is not coated with the electrode active material slurry 20. It can be supplied facing upwards.

After coating the other side of the electrode current collector 10, the electrode roll R3 may be wound with the electrode 1 coated with the electrode active material slurry 20 and 30 on both sides of the electrode current collector 10.

The drying unit 130 may dry the electrode active material slurry 20 coated on one side 11 of the electrode current collector 10 before coating the other side 12 of the electrode current collector 10. At this time, the drying unit 130 may semi-dry or completely dry the electrode active material slurry 20.

For example, the drying unit 130 includes a heater and can dry the electrode active material slurry 20 coated on one side 11 of the electrode current collector 10 by applying heat through the heater.

On the other hand, as another example, the drying unit coats the electrode active material slurry 20 on one surface 11 of the electrode current collector 10, and then coats the electrode current collector 10 wound on the winding roll R2 with a chamber and a vacuum means. The electrode active material slurry 20 coated on one surface 11 of the electrode current collector 10 can be vacuum dried by being placed in a vacuum-type drying unit.

Although the present invention has been described in detail through specific examples, these are for detailed explanation of the present invention, and the present invention is not limited thereto. It will be said that various implementations are possible by those skilled in the art within the technical spirit of the present invention.

Additionally, the specific scope of protection of the invention will be made clear by the appended claims.

1: electrode
10: Electrode current collector
11: One side
12: If you ride
20,30: Electrode active material slurry
100: Electrode manufacturing device for secondary batteries
110: Coating part
120: means of transportation
130: drying unit
140: flattening means
150: Limiter
160: detection unit
170: Control unit
G: Direction
N: Non-free area
T: Maintenance area

Claims (16)

A one-side coating step of coating an electrode active material slurry on one side of an electrode current collector; and
After the one-side coating step, the electrode current collector is inverted to position the other side of the electrode current collector to face upward, and a second side coating step of coating the other side of the electrode current collector with an electrode active material slurry,
A method of manufacturing an electrode for a secondary battery, further comprising a flattening step of applying an external force to at least one end in the width direction of the electrode current collector through a flattening means during the other surface coating step to flatten the electrode current collector. In claim 1,
The one-side coating step and the other-side coating step include applying the electrode active material slurry to the electrode current collector except for both ends in the width direction of the electrode current collector, and forming a holding portion of the electrode current collector onto which the electrode active material slurry is applied. A method of manufacturing an electrode for a secondary battery in which an uncoated region and an uncoated region where the electrode active material slurry is not applied are formed, and the flattening step involves applying an external force to both ends in the width direction, which are the uncoated regions of the electrode current collector. In claim 2,
The flattening means includes an air blower,
The flattening step is a method of manufacturing an electrode for a secondary battery in which air is sprayed onto the end of the electrode current collector through the air blower to flatten the bent portion. In claim 3,
The flattening step is
A method of manufacturing an electrode for a secondary battery in which the air blower is positioned below the end of the electrode current collector, air is blown upward, and the end of the electrode current collector bent downward is bent in the opposite direction of the bending direction to flatten. In claim 4,
The flattening step is
A secondary battery that controls the end of the electrode current collector from bending further upward than the upper surface of the holding area of the electrode current collector when a limiter is placed on the upper end of the electrode current collector to spray air from the bottom to the top. Electrode manufacturing method. In claim 1,
A detection step of detecting whether or not the end of the electrode current collector is bent or the amount of bending through a detector during the coating step of the other surface; and
A method of manufacturing an electrode for a secondary battery further comprising a control step of receiving a detection value of whether or not an end of the electrode current collector is bent or of a bending amount through the detection step and controlling the operation of the flattening means through a control unit. In claim 1,
A winding step of winding the electrode current collector coated with the electrode active material slurry on one side through the single-side coating step on a winding roll; and
After the winding step, the electrode current collector wound on the winding roll is unwound and supplied to a coating unit for coating the electrode active material slurry, and the other side of the electrode current collector not coated with the electrode active material slurry is directed upward. A method of manufacturing an electrode for a secondary battery further comprising a supply step of supplying. In claim 1,
A method of manufacturing an electrode for a secondary battery further comprising a drying step of drying the electrode active material slurry coated on one side of the electrode current collector through the one-side coating step before the other side coating step. In claim 1,
The one-side coating step and the other side coating step include a transfer process of transferring the electrode current collector through a transfer means,
The transfer process is
In the one-side coating step, the lower surface of the electrode current collector is supported and transported through the transport means,
In the other side coating step, a method of manufacturing an electrode for a secondary battery in which the lower surface of the electrode active material slurry coated on one side of the electrode current collector is supported and transported through the transfer means. A coating portion that coats the upper part of the electrode current collector by applying an electrode active material slurry; and
It includes a flattening means that applies an external force to at least one end in the width direction of the electrode current collector to flatten it,
The coating unit applies the electrode active material slurry to one side of the electrode current collector, and then inverts and applies the electrode active material slurry to the other side of the electrode current collector, which is positioned to face upward. In claim 10,
The coating part
The electrode active material slurry is coated on the electrode current collector by applying the electrode active material slurry to the upper part of the electrode current collector moving in the direction in which the electrode current collector is moved, except for both ends of the electrode current collector in the moving direction. Applying the electrode active material slurry to the electrode current collector to form a holding area in the electrode current collector to which the electrode active material slurry is applied and an uncoated area to which the electrode active material slurry is not applied,
The flattening means flattens the bent ends of the electrode current collector by applying an external force to both ends of the electrode current collector that are uncoated regions in a traveling direction. In claim 11,
The flattening means includes an air blower,
The air blower is a secondary battery electrode manufacturing device that flattens the bent portion by spraying air on the end of the electrode current collector. In claim 12,
The air blower is located at the lower end of the electrode current collector, and blows air from the bottom to the top to flatten the end of the electrode current collector bent in the downward direction by bending it in the opposite direction of the bending direction. Manufacturing equipment. In claim 13,
A limiter is provided above the end of the electrode current collector to prevent the end of the electrode current collector from bending further upward than the upper surface of the holding area of the electrode current collector when air is sprayed from the bottom to the top. An electrode manufacturing device for secondary batteries, including: In claim 10,
A detection unit that detects whether or not the end of the electrode current collector is bent or the amount of bending is moved in the direction during coating of the other surface of the electrode current collector; and
The apparatus for manufacturing electrodes for secondary batteries further includes a control unit that receives the detection value of bending or bending amount of the end of the electrode current collector detected through the detection unit and controls the operation of the flattening means. In claim 10,
Further comprising a transport means for transporting the electrode current collector,
The means of transportation is
When applying the electrode active material slurry to one side of the electrode current collector, the lower surface of the electrode current collector is supported and transferred,
An electrode manufacturing device for a secondary battery that supports and transports the lower surface of the electrode active material slurry coated on one side of the electrode current collector when applying the electrode active material slurry to the other side of the electrode current collector.

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