KR20240082208A - An apparatus for manufacturing an electrode and a method for manufacturing the electrode - Google Patents

Abstract

A rolling device for manufacturing an electrode according to an embodiment of the present invention includes: a rolling member that rolls the electrode substrate when the electrode substrate passes through; and a non-coated stretching member that additionally extends the uncoated portion of the electrode substrate that has passed through the rolling member, wherein the non-coated stretching member has a ratio of the uncoated portion stretching member compared to the electrode substrate according to the state of the uncoated portion of the electrode substrate. Relative positions are adjusted.

Description

{An apparatus for manufacturing an electrode and a method for manufacturing the electrode}

Cross-Citation with Related Application(s)

This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0165533, dated December 1, 2022, and all contents disclosed in the document of the Korean Patent Application are included as part of this specification.

The present invention relates to a rolling device for manufacturing electrodes and a rolling method for manufacturing electrodes, and more specifically, to a rolling device for manufacturing electrodes and a rolling method for manufacturing electrodes that enable precise control of additional stretching in the uncoated area of the electrode base during the electrode rolling process. will be.

In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras becomes routine, the development of technologies in fields related to the above mobile devices is becoming more active. In addition, secondary batteries that can be charged and discharged are a way to solve air pollution from existing gasoline vehicles that use fossil fuels, and are used in electric vehicles (EV), hybrid electric vehicles (HEV), and plug-in hybrid electric vehicles ( As it is used as a power source for batteries such as P-HEV), the need for development of secondary batteries is increasing.

Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so they can be freely charged and discharged. It is receiving attention for its extremely low self-discharge rate and high energy density.

The manufacturing process of these lithium secondary batteries is largely divided into three stages: electrode process, assembly process, and chemical conversion process. The electrode process is further divided into an active material mixing process, electrode coating process, rolling process, slitting process, and winding process. Among these, the rolling process increases capacity density by reducing the thickness of the electrode base after the coating process, and passes the electrode base between a pair of rolling rolls heated at high temperature to increase the adhesion between the electrode current collector and the electrode active material. This is a process of compressing to the desired thickness.

Meanwhile, during rolling of the electrode base, phenomena such as waviness in the uncoated area 11 of the electrode base after rolling due to the difference in stretchability between the holding part 12 coated with the active material and the uncoated area 11 not coated with the active material. There is a problem that arises. In order to improve this, referring to FIG. 1, the process is performed by applying additional stretching to the uncoated portion 11 of the electrode base 10 that has passed between the rolling members 110 by the uncoated portion stretching member 120. However, depending on the tension that the uncoated region stretching member 120 applies to the uncoated region 11 of the electrode base, the swell of the uncoated region 11 may be improved, but in some cases, it may further worsen.

Therefore, during the rolling process of the electrode base, there is a need for a method to more effectively improve the problem of occurrence of swells in the uncoated area 11 of the electrode base.

The purpose of the present invention is to improve the problem of waviness of the uncoated portion 11 of the electrode substrate by additionally stretching the uncoated portion 11 and controlling the degree of stretching during the rolling process of the electrode substrate.

However, the problems to be solved by the embodiments of the present invention are not limited to the above-described problems and can be expanded in various ways within the scope of the technical idea included in the present invention.

A rolling device for manufacturing an electrode according to an embodiment of the present invention includes: a rolling member that rolls the electrode substrate when the electrode substrate passes through; and a non-coated stretching member that additionally extends the uncoated portion of the electrode substrate that has passed through the rolling member, wherein the non-coated stretching member has a ratio of the uncoated portion stretching member compared to the electrode substrate according to the state of the uncoated portion of the electrode substrate. Relative positions can be adjusted.

It further includes a driving unit that adjusts the position of the non-coated stretching member, wherein the non-coated stretching member maintains its position, advances toward the electrode substrate, or moves backward from the electrode substrate in the opposite direction, thereby stretching the non-coated portion. The position of the member can be adjusted.

It further includes a monitoring unit that monitors the electrode base to determine the state of the uncoated part of the electrode base, and when the uncoated part of the electrode base is in a normal state, the uncoated part stretching member maintains its position, and the uncoated part of the electrode base is in a normal state. When the uncoated portion is in a predetermined first ideal state, the uncoated portion stretching member advances toward the electrode base, and when the uncoated portion of the electrode substrate is in a predetermined second ideal state, the uncoated portion stretching member moves backward toward the electrode base. can do.

The first abnormal state is a state in which valleys or ridges of the swell of the uncoated portion occur in the longitudinal direction of the electrode base, and the second abnormal state is a state in which the valley or crest of the swell of the uncoated portion occurs in the width direction of the electrode base. It can be.

When the angle between the direction of the swell or crest of the uncoated portion and the direction of progress of the electrode base is 0 degrees or more and less than 45 degrees, the uncoated portion is determined to be in a first abnormal state, and the direction of the swell or crest of the uncoated portion is determined to be in the first abnormal state. When the angle between the direction of movement of the electrode base is greater than 45 degrees and less than or equal to 90 degrees, the uncoated portion is determined to be in a second abnormal state, and the angle between the direction of the trough or crest of the swell of the uncoated portion and the direction of movement of the electrode substrate is When is 45 degrees, the uncoated portion may be determined to be one of the first ideal state and the second ideal state.

When the uncoated portion of the electrode substrate is in a predetermined first abnormal state, the uncoated portion stretching member advances toward the electrode substrate by a first predetermined value, and the uncoated portion of the electrode substrate is determined to be in a normal state. Advancement of the stretching member by the first predetermined value may be repeatedly performed.

When the uncoated portion of the electrode base is in a predetermined second abnormal state, the uncoated portion stretching member retracts from the electrode base by a second predetermined value, and the uncoated portion of the electrode base is determined to be in a normal state. Retraction of the stretching member by the second predetermined value may be repeatedly performed.

The monitoring unit is located at the rear end of the non-coated stretching member and monitors the state of the uncoated portion of the electrode base that has passed through the non-coated stretching member, and the position of the non-coated stretching member can be adjusted accordingly.

The monitoring unit is located between the rear end of the rolling member and the front end of the uncoated stretching member, and monitors the state of the uncoated portion of the electrode base that has passed through the rolling member, and the position of the uncoated stretching member is adjusted accordingly. It can be.

The rolling member is a pair of rolling rollers rotating in opposite directions about a rotation axis, the uncoated stretching member is an uncoated region pressing roller including a pressing portion, and the pressing portion is located at a position corresponding to the uncoated portion of the electrode base. and may have a structure protruding from the outer peripheral surface of the uncoated portion pressing roller.

The driving unit may be an actuator connected to the non-coated portion pressing roller.

It may further include a guide member that guides movement of the electrode base.

It may further include an electrode rewinder that winds and recovers the electrode substrate.

A rolling method for manufacturing an electrode according to an embodiment of the present invention includes: rolling an electrode substrate with a rolling member; Additional stretching of the uncoated portion of the rolled electrode base using an uncoated portion stretching member; And a step of monitoring the electrode base with a monitoring unit to determine the state of the uncoated part of the electrode base, wherein when the state of the uncoated part of the electrode base is abnormal, the relative value of the uncoated part stretching member compared to the electrode base. A step of adjusting the position may be further included.

When the uncoated portion of the electrode base is in a normal state, the uncoated portion stretching member can maintain its position.

The step of adjusting the relative position of the uncoated portion stretching member includes: when the uncoated portion of the electrode base is in a predetermined first ideal state, the uncoated portion stretching member advances toward the electrode base; and when the uncoated portion of the electrode base is in a predetermined second abnormal state, the uncoated portion stretching member moves backward toward the electrode base.

The first abnormal state is a state in which valleys or ridges of the swell of the uncoated portion occur in the longitudinal direction of the electrode base, and the second abnormal state is a state in which the valley or crest of the swell of the uncoated portion occurs in the width direction of the electrode base. It can be.

When the angle between the direction of the swell or crest of the uncoated portion and the direction of progress of the electrode base is 0 degrees or more and less than 45 degrees, the uncoated portion is determined to be in a first abnormal state, and the direction of the swell or crest of the uncoated portion is determined to be in the first abnormal state. When the angle between the direction of movement of the electrode base is greater than 45 degrees and less than or equal to 90 degrees, the uncoated portion is determined to be in a second abnormal state, and the angle between the direction of the trough or crest of the swell of the uncoated portion and the direction of movement of the electrode substrate is When is 45 degrees, the uncoated portion may be determined to be one of the first ideal state and the second ideal state.

When the uncoated portion of the electrode substrate is in a predetermined first abnormal state, the uncoated portion stretching member advances toward the electrode substrate by a first predetermined value, and the uncoated portion of the electrode substrate is determined to be in a normal state. Advancement of the stretching member by the first predetermined value may be repeatedly performed.

When the uncoated portion of the electrode base is in a predetermined second abnormal state, the uncoated portion stretching member retracts from the electrode base by a second predetermined value, and the uncoated portion of the electrode base is determined to be in a normal state. Retraction of the stretching member by the second predetermined value may be repeatedly performed.

According to the present invention, during the rolling process of the electrode base, the uncoated area 11 of the electrode base is additionally stretched, and the position of the uncoated area stretching member is adjusted to more effectively solve the problem of waviness of the uncoated area 11. It can be improved. Accordingly, the production efficiency of the electrode assembly can be maximized and the quality of the produced electrode assembly can also be improved.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Figure 1 shows a rolling device for manufacturing electrodes according to the prior art.
Figure 2 shows a rolling device for manufacturing an electrode according to an embodiment of the present invention.
Figure 3 is a schematic diagram showing a part of the electrode base material.
FIG. 4 shows a non-coated rolling roller provided in the rolling device for manufacturing the electrode of FIG. 2.
FIG. 5 shows an example of setting the degree of forward and backward movement of the non-part stretched member of FIG. 2 as a process variable of the wrap angle (θ).
Figures 6 and 7 each show examples of abnormal states of the uncoated portion of the electrode substrate.
Figure 8 is a rolling apparatus for manufacturing an electrode according to another embodiment of the present invention, showing a modified example of the rolling apparatus for manufacturing an electrode of Figure 2.
9 and 10 show a flowchart of a rolling method for manufacturing an electrode according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, various embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are assigned the same reference numerals throughout the specification.

In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown. In the drawing, the thickness is enlarged to clearly express various layers and areas. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated.

Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” or “on” another part, this includes not only cases where it is “directly above” another part, but also cases where there is another part in between. . Conversely, when a part is said to be “right on top” of another part, it means that there is no other part in between. In addition, being “on” or “on” a standard part means being located above or below the standard part, and it necessarily means being “on” or “on” the direction opposite to gravity. no.

In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

In addition, throughout the specification, when referring to “on a plane,” this means when the target portion is viewed from above, and when referring to “in cross-section,” this means when a cross section of the target portion is cut vertically and viewed from the side.

Hereinafter, the rolling apparatus 100 for manufacturing an electrode according to an embodiment of the present invention will be described with reference to FIGS. 2 to 5.

The rolling apparatus 100 for manufacturing an electrode in FIG. 2 includes a rolling member 110, an uncoated stretching member 120, a monitoring unit 130, a guide member 140, and an electrode rewinder 150.

As shown in FIG. 3, the electrode base 10 has a structure in which an electrode mixture is coated on one or both sides of a current collector made of aluminum foil, etc., that is, a holding portion 12 (see FIG. 3). The electrode substrate 10 is rolled while passing through the rolling member 110.

The rolling member 110 may be, for example, a pair of rolling rollers. Each of the rolling rollers rotates in opposite directions to each other around a rotation axis in the longitudinal direction of each of the rolling rollers located at the center of each pair of rolling rollers. When the electrode substrate 10 passes between rolling rollers, the holding portion 12 is rolled.

At this time, swells may occur in the uncoated portion 11 of the electrode base 10 that has passed through the rolling member 110.

Thereafter, the uncoated portion 11 of the electrode base 10 is stretched by the uncoated portion stretching member 120 disposed subsequent to the rolling member 110. More specifically, as shown in FIG. 4, the non-coated stretching member 120 may be, for example, a pressure roller. Additionally, in order to solve the problem of swells occurring in the uncoated portion 11, a pressing portion 120a for pressing only the uncoated portion 11 of the electrode base 10 may be included.

The pressing portion 120a of the uncoated portion stretching member 120 is formed at a position corresponding to the uncoated portions 11 of the electrode base 10. Additionally, the pressing portion 120a has a structure that protrudes from the outer peripheral surface of the non-coated stretching member 120. Accordingly, only the uncoated portion 11 can be pressed with the pressing portion 120a of the uncoated portion stretching member 120, excluding the holding portion 12 of the electrode base 10.

The pressing portion 120a of the non-coated stretching member 120 may be formed integrally with the roller body of the non-coated stretching member 120, and may be formed by a shrink fit method on the outer peripheral surface of the non-coated stretching member 120. It may be removable.

Additionally, the pressing portion 120a may include a heat ray therein for applying heat to the uncoated portion 11 for effective rolling of the uncoated portion 11.

The width of the pressing portion 120a may be the same as or slightly smaller than the width of the uncoated portion 11 of the electrode substrate 10. For example, the pressing portion 120a may have a width of 90% to 100% of the width of the uncoated portion 11.

The non-stretching member 120 is formed of, for example, a metal such as aluminum or an alloy thereof, or stainless steel, or a plastic material made of a high-strength and high-hardness engineering plastic material, a plastic material with low hardness, or a rubber-based plastic material. It can be.

The non-coated stretching member 120 may rotate in the direction in which the electrode substrate 10 moves around a rotation axis located in the longitudinal direction at the center of the non-coated stretching member 120 .

Meanwhile, both ends of the non-coated stretching member 120 are connected to a driving unit (not shown) that can adjust the position of the non-coated stretching member 120. The driving unit may be, for example, an actuator that adjusts the position of the non-coated stretching member 120. The driving unit may advance (A1) the non-coated stretching member 120 toward the electrode base 10, or, conversely, may cause it to move backward (A2) from the electrode base 10.

For example, bar-shaped support members are connected to both ends of the non-coated stretching member 120 in the direction of the rotation axis of the non-coated stretching member 120, and the non-coated stretching member 120 and the support member are used as a driving unit. It may be advanced (A1) toward the electrode base material 10, or, conversely, may be moved backward (A2) from the electrode base material 10.

The state (e.g., degree of swell improvement) of the uncoated portion 11 of the electrode base 10 stretched by the uncoated portion stretching member 120 is monitored by the monitoring unit 130. The monitoring unit 130 may be, for example, a vision unit that captures an image of the state of the uncoated portion 11 of the electrode substrate 10.

The monitoring unit 130 monitors the state of the uncoated area 11 and determines the state of the uncoated area 11 by a processor 130a that is integrated with or separately provided and connected to the monitoring unit 130. For example, the monitoring unit 130 may determine the state of the uncoated portion 11 of the electrode substrate 10 as a normal state or an abnormal (abnormal) state.

The relative position of the uncoated portion stretching member 120 with respect to the electrode substrate 10 may be adjusted depending on the state of the uncoated portion 11 of the electrode substrate 10.

If the state of the uncoated region 11 of the electrode base 10 corresponds to a normal state, the position of the uncoated region stretching member 120 is maintained without changing and the uncoated region 11 is pressed. Here, the state of the uncoated area 11 corresponds to a normal state, which means that when the uncoated area 11 of the electrode base is monitored by the monitoring unit 130, no swells or the like occur in the uncoated area 11, and the holding area It refers to the degree to which the flatness of (12) and the flatness of the uncoated area (11) are the same or within the error range. The extent to which the holding portion 12 is stretched and the extent to which the uncoated portion 11 is stretched from the electrode base are within an error range. However, if the state of the uncoated portion 11 of the electrode base 10 corresponds to an abnormal (abnormal) state, the position of the uncoated portion stretching member 120 is adjusted by the driving unit.

If it is determined that the state of the uncoated portion 11 of the electrode base 10 corresponds to a predetermined first abnormal state among the abnormal (abnormal) states, the driving unit advances the uncoated portion stretching member 120 toward the electrode substrate 10 ( A1) Let’s do it. Alternatively, if it is determined that the state of the uncoated portion 11 of the electrode base 10 corresponds to a predetermined second abnormal state among the abnormal (abnormal) states, the driving unit moves the uncoated portion stretching member 120 in the opposite direction to the electrode substrate ( 10) Reverse (A2). That is, when a swell occurs in the uncoated portion 11 of the electrode base 10 that has passed between the rolling members 110, the uncoated portion 11 is further stretched by the uncoated portion stretching member 120, thereby forming the uncoated portion 11. ) solves the problem of swell generation. At this time, the status of the uncoated area 11 of the electrode base 10 is monitored during the process by the monitoring unit 130, and the position of the uncoated area stretching member 120 is adjusted accordingly to further stretch the uncoated area 11. Adjust the degree. Depending on various process variables such as the type of electrode current collector and electrode mixture, the transfer speed of the electrode base 10, and the degree of rolling by the rolling member 110, the non-part stretched member 120 is formed into the electrode base 10. When moving forward (A1), the degree of swell of the uncoated area 11 may be improved, and conversely, the uncoated area stretching member 120 is moved backward (A2) from the electrode base 10 to form the uncoated area 11. When the degree of stretching applied is reduced, there may be cases where the degree of waviness of the uncoated region 11 is improved.

That is, a predetermined first ideal state, a predetermined second ideal state, and a normal state can be set in advance to suit the various environments in which the present invention is implemented, and the position of the non-part elongated member 120 can be adjusted accordingly.

In addition, in accordance with the various environments in which the present invention is implemented, the degree to which the non-coated stretching member 120 advances (A1) and/or moves backward (A2) is set in more detail in advance, and the non-coated stretching member 120 Position adjustment can also be performed precisely.

Meanwhile, the present invention is not limited to what is shown in FIG. 3 with respect to the uncoated portion 11 of the electrode base 10, and similarly, the uncoated portion stretching member 120 is not limited to what is shown in FIG. 4. With respect to the uncoated portion 11 and the uncoated portion stretching member 120 of the electrode substrate 10, the present invention can be implemented by applying the present invention through various modifications and changes to suit various environments and situations in which the present invention is implemented. In some cases, the degree to which the non-part stretching member 120 advances (A1) and/or moves backward (A2) is set as a process variable of the wrap angle (θ) to adjust the degree of the angle. You can also do it this way. As shown in FIG. 5 , the wrap angle refers to an angle surrounding a portion of the non-coated stretching member 120 when the electrode base 10 is in contact with the non-coated stretching member 120.

Figures 6 and 7 each show examples of an abnormal (abnormal) state of the uncoated region 11. The portion indicated by the dotted line of the electrode base 10 shown in FIG. 3 is enlarged to show a top view, a side view, and a cross-sectional view of the electrode base 10, respectively. The arrow indicates the direction of movement of the electrode base 10 during the process, and does not necessarily mean that the direction of movement is the upward direction of the drawing, and the direction of movement of the electrode base 10 in the longitudinal direction of the electrode base 10 is suitable for various environments to which the present invention is applied. It is enough for (10) to proceed.

First, an example of a predetermined first abnormal state is a case where the swell of the uncoated region 11 is formed along the direction of travel of the electrode base material 10, as exemplarily shown in FIG. 6 . This is the case where an extension line running along the valley of the swell (direction of the valley of the swell) and/or an extension line running along the crest of the swell (direction of the crest of the swell) is formed along the direction of travel of the electrode base material 10.

This occurs when the degree to which the uncoated portion 11 is stretched is smaller than the degree to which the holding portion 12 is stretched. That is, even if the uncoated portion 11 is stretched by the uncoated portion stretching member 120, if the holding portion 12 is not stretched sufficiently to the extent to which the holding portion 12 is stretched, a swell may form on the stretched uncoated portion 11 and form the electrode substrate 10. It is formed in the direction of progress.

Additionally, depending on the degree of relative stretching of the uncoated portion 11 with respect to the holding portion 12, the valleys of the swell become deeper or shallower. The difference between the degree of stretching of the uncoated portion 11 and the degree of stretching of the holding portion 12 (i.e., the absolute value of the value obtained by subtracting the stretching degree of the holding portion 12 from the stretching degree of the uncoated region 11) is small. As the stretching increases, the valley of the swell becomes shallower, and when the stretching degree of the holding portion 12 and the stretching degree of the uncoated portion 11 become equal within the error range, the swell of the uncoated portion 11 disappears.

On the other hand, not only when the direction of the valleys and/or peaks of the swell of the uncoated area 11 coincides with the direction of progress of the electrode base 10, but also depending on the type of the electrode base and the process environment, the swell of the uncoated area 11 Since the direction of the valleys and/or ridges may have an inclination angle obliquely based on the direction of movement of the electrode base material 10, the direction of the valleys and/or ridges of the swell of the uncoated region 11 and the electrode base material 10 The angle between the moving directions may be formed within a range of 0 degrees or more and 45 degrees or less.

In summary, the monitoring unit 130 monitors the direction of the valleys and/or crests of the swell of the uncoated region 11, and determines the first abnormal state when they are formed along the moving direction of the electrode base 10.

In other words, the direction of the valleys and/or crests of the swells of the uncoated area 11 is formed along the direction of progress of the electrode base 10, which means that the direction of the valleys and/or ridges of the swells of the uncoated area 11 and the electrode When the angle between the moving directions of the base material 10 is 0 degrees or more and 45 degrees or less, the first abnormal state is determined.

When the state of the uncoated portion 11 of the electrode substrate 10 is determined to be the first abnormal state, the uncoated portion stretching member 120 advances toward the electrode substrate 10.

In addition, an example of the predetermined second ideal state is, as exemplarily shown in FIG. 7, the swell of the uncoated area 11 is in the width direction of the electrode base 10 (the direction in which the electrode base 10 moves and This is the case where it is formed along a perpendicular direction. This is the case where an extension line running along the valley of the swell (direction of the valley of the swell) and/or an extension line running along the crest of the swell (direction of the crest of the swell) is formed along the width direction of the electrode substrate 10.

This occurs when the degree to which the uncoated portion 11 is stretched is greater than the degree to which the holding portion 12 is stretched. That is, the uncoated portion 11 is stretched by the uncoated portion stretching member 120, but if the uncoated portion 11 is stretched further than the holding portion 12, a swell appears on the uncoated portion 11, which is relatively longer in length. It is formed in the width direction of the electrode base material 10.

Additionally, depending on the degree of relative stretching of the uncoated portion 11 with respect to the holding portion 12, the valleys of the swell become deeper or shallower. The difference between the degree of stretching of the uncoated portion 11 and the degree of stretching of the holding portion 12 (i.e., the absolute value of the value obtained by subtracting the stretching degree of the holding portion 12 from the stretching degree of the uncoated region 11) is small. As the stretching increases, the valley of the swell becomes shallower, and when the stretching degree of the holding portion 12 and the stretching degree of the uncoated portion 11 become equal within the error range, the swell of the uncoated portion 11 disappears.

On the other hand, not only when the direction of the valleys and/or peaks of the swell of the uncoated area 11 are perpendicular to the direction of progress of the electrode base 10, but also depending on the type of the electrode base and the process environment, the swell of the uncoated area 11 Since the direction of the valleys and/or ridges may have an inclination angle obliquely based on the direction perpendicular to the direction of movement of the electrode base 10, the direction of the valleys and/or ridges of the swell of the uncoated region 11 and the electrode The angle between the moving directions of the substrate 10 may be formed within a range of 45 degrees or more and 90 degrees or less.

In summary, the monitoring unit 130 monitors the direction of the valleys and/or crests of the swell of the uncoated region 11, and determines the second abnormal state when they are formed along the width direction of the electrode base 10.

To elaborate, the direction of the valleys and/or crests of the swells of the uncoated area 11 is formed along the width direction of the electrode base 10, which means that the direction of the valleys and/or ridges of the swells of the uncoated area 11 and the electrode When the angle between the moving directions of the base material 10 is 45 degrees or more and 90 degrees or less, the second ideal state is determined.

When the state of the uncoated area 11 of the electrode base 10 is determined to be the second abnormal state, the uncoated area stretching member 120 moves backward from the electrode base 10.

For reference, when the valley and/or crest of the swell of the uncoated region 11 is 45 degrees based on the direction of movement of the electrode base 10, the uncoated region stretching member 120 is moved forward (A1) or backward (A2). Whether to do so is preset to suit the relevant environment, depending on various process variables such as the type of electrode current collector and electrode mixture, the transfer speed of the electrode base 10, and the degree of rolling by the rolling member 110. That is, when the angle between the direction of the trough and/or crest of the swell of the uncoated region 11 and the direction of progress of the electrode base 10 is 45 degrees, the type of electrode base 10 is selected according to the environment in which the present invention is implemented. , it is determined to be either a first ideal state or a second ideal state depending on the process environment, etc.

On the other hand, when the state of the uncoated portion 11 of the electrode base 10 is determined to be the first abnormal state, the uncoated portion stretching member 120 advances toward the electrode substrate 10 and the uncoated portion of the electrode substrate 10 When the state of (11) is determined to be the second ideal state, the degree to which the non-coated stretching member 120 moves backward from the electrode base 10 is predetermined depending on the type of electrode base 10 and/or the corresponding process environment. It could be. To elaborate, the degree to which the non-coated stretching member 120 advances and the degree to which it moves backward are predetermined to a first predetermined value and a second predetermined value, respectively.

When the monitoring unit 130 determines that the monitored state of the uncoated portion 11 of the electrode substrate 10 is in the first abnormal state, the result is fed back to the uncoated portion stretching member 120, and the uncoated portion stretching member 120 is accordingly fed back. 120 advances toward the electrode base 10 by a first predetermined value.

The monitoring unit 130 monitors the uncoated portion 11 of the electrode base 10 stretched by the non-coated stretching member 120 following the forward/backward movement of the non-coated stretching member 120. . Alternatively, regardless of this, the uncoated region 11 of the electrode base 10 stretched by the uncoated region stretching member 120 may be continuously monitored by the monitoring unit 130 .

If it is determined that the state of the uncoated region 11 of the electrode base 10 stretched by the uncoated region stretching member 120 advanced by the first predetermined value is still the first abnormal state, the result is determined by the uncoated region stretching member 120 ), and the non-coated stretching member 120 advances again toward the electrode base 10 by the first predetermined value.

When the state of the uncoated portion 11 of the electrode base 10 stretched by the uncoated portion stretching member 120 advanced by the first predetermined value is determined to be in a normal state, the uncoated portion stretching member 120 does not advance or retreat. No, it maintains its position.

Rather, if the state of the uncoated portion 11 of the electrode base 10 stretched by the uncoated portion stretching member 120 advanced by the first predetermined value is determined to be the second abnormal state, the result is determined to be in the non-coated portion stretching member 120 120), and the non-coated stretching member 120 moves backward from the electrode base 10 by a second predetermined value.

The above-described process is repeatedly performed until the state of the uncoated region 11 of the electrode base 10 stretched by the uncoated region stretching member 120 is determined to be in a normal state.

Likewise, when the monitoring unit 130 determines that the state of the uncoated portion 11 of the electrode substrate 10 monitored is the second abnormal state, the result is fed back to the uncoated portion stretching member 120, and the uncoated portion The stretching member 120 moves backward from the electrode base 10 by a second predetermined value.

If it is determined that the state of the uncoated portion 11 of the electrode base 10 stretched by the non-coated portion stretching member 120 retracted by the second predetermined value is still the second abnormal state, the result is transferred to the non-coated portion stretching member 120. ) is fed back, and the non-coated stretching member 120 advances again from the electrode base 10 by a second predetermined value.

When the state of the uncoated portion 11 of the electrode base 10 stretched by the non-coated portion stretching member 120 retracted by the second predetermined value is determined to be in a normal state, the non-coated portion stretching member 120 does not advance or retreat. No, it maintains its position.

Rather, when it is determined that the state of the uncoated portion 11 of the electrode base 10 stretched by the uncoated portion stretching member 120 retracted by the second predetermined value is the first abnormal state, the result is expressed as the non-coated portion stretching member ( 120), and the non-coated stretching member 120 advances toward the electrode base 10 by a first predetermined value.

The above-described process is repeatedly performed until the state of the uncoated region 11 of the electrode base 10 stretched by the uncoated region stretching member 120 is determined to be in a normal state.

In addition, each of the first predetermined value and the second predetermined value is determined by the type of electrode base 10 in which the present invention is implemented, the process environment (type of electrode current collector and electrode mixture, transfer speed of electrode base 10, rolling Depending on various process variables such as the degree of rolling by the member 110, etc., it may be preset in various ways to suit the relevant environment.

Figure 8 shows a modified example of the rolling device for manufacturing the electrode of Figure 2.

First, in the case of FIG. 2, the monitoring unit 130 is located at the rear end of the non-coated stretching member 120. Accordingly, the monitoring unit 130 monitors the electrode base 10 that has passed through the non-coated stretching member 120 and adjusts the position of the non-coated stretching member 120, which is then used as the non-coated stretching member 120. The degree of swell of the uncoated portion 11 of the incoming electrode substrate 10 is adjusted.

In the case of FIG. 8, the monitoring unit 130 is located between the rear end of the rolling member 110 and the front end of the non-coated stretching member 120. Accordingly, the position of the non-coated stretching member 120 is adjusted by monitoring the electrode substrate 10 that has passed through the rolling member 110.

As described above in FIG. 2, the method of monitoring the electrode base 10 to adjust the position of the non-stretching member 120 includes a predetermined first ideal state and a predetermined ideal state according to various environments in which the present invention is implemented. The second abnormal state and the normal state can be set in advance, and the position of the non-stretched member 120 can be adjusted accordingly.

Hereinafter, a rolling method for manufacturing an electrode according to an embodiment of the present invention will be described with reference to FIGS. 9 and 10.

Referring to FIG. 9, the rolling method for manufacturing an electrode according to an embodiment of the present invention includes the step of rolling an electrode substrate with a rolling member 110 (S110); and additionally stretching the uncoated portion 11 of the rolled electrode base 10 with the uncoated portion stretching member 120 (S120) and monitoring the electrode substrate with the monitoring unit 130 to check the state of the uncoated portion of the electrode substrate. Includes a determination step (S130). In the embodiment of FIG. 2, step S130 follows step S120. Alternatively, in the embodiment of FIG. 8, step S120 may be performed after step S130. Hereinafter, the device in the embodiment of FIG. 2 will be described with reference to FIG. 10.

In step S130, it is determined whether the state of the uncoated region is normal, and if the state of the uncoated region is determined to be abnormal, step S130 includes a step S131 of determining whether the state of the uncoated region is a first abnormal state or a second abnormal state. When the state of the uncoated portion is determined to be abnormal, step S131 determines whether the direction of the swell of the uncoated portion is formed in the advancing direction of the electrode substrate or in the width direction of the electrode substrate, and whether the state of the uncoated portion is the first abnormal state or the second abnormal state. For a more detailed description of the point of determining whether the state is 2 or higher, refer to the above-described description since it overlaps with that of FIGS. 1 to 7 .

It includes a step (S140) of adjusting the relative position of the stretching member of the uncoated area with respect to the electrode base using a driving unit, according to the state of the uncoated area 11 of the electrode base monitored by the monitoring unit.

When it is determined in step S130 that the uncoated portion of the electrode base is in a normal state, the uncoated portion stretching member maintains its position.

Step S140 includes a step (S141) in which, when it is determined in step S130 (step S131) that the uncoated portion of the electrode base is in a predetermined first abnormal state, the uncoated portion stretching member advances toward the electrode base by a first predetermined value. Additionally, step S140 includes a step (S142) in which, when it is determined in step S130 (step S131) that the uncoated portion of the electrode base is in a predetermined second abnormal state, the uncoated portion stretching member moves backward toward the electrode base by a second predetermined value. can do. The step of adjusting the relative positions of the uncoated portion stretching members (S140) is repeatedly performed until the uncoated portion of the electrode base is determined to be in a normal state.

In one embodiment, the electrode refers to the positive electrode and/or negative electrode of a lithium secondary battery.

The positive electrode has a structure in which a two-layer positive electrode active material layer is laminated on a positive electrode current collector. In one example, the positive electrode active material layer includes a positive electrode active material, a conductive material, and a binder polymer, and, if necessary, may further include a positive electrode additive commonly used in the art.

The positive electrode active material may be a lithium-containing oxide and may be the same or different. As the lithium-containing oxide, a lithium-containing transition metal oxide can be used.

For example, lithium-containing transition metal oxides include Li _x CoO ₂ (0.5<x<1.3), Li _x NiO ₂ (0.5<x<1.3), Li _x MnO ₂ (0.5<x<1.3 ₎ , Li ₂ O ₄ (0.5<x<1.3), Li _x (Ni _a Co _b Mn _c )O ₂ (0.5<x<1.3, 0<a<1, 0<b<1, 0<c<1, a+ b+c=1 ₎ , Li _x Ni _1-y Co _y O ₂ (0.5<x<1.3, 0< _y < ₁ ), _Li y _< 1), Li _x Ni _{1-y Mn y O 2} (0.5<x<1.3, O≤y _< 1), _Li a<2, 0<b<2, 0<c<2, a+b+c=2), Li _x Mn _2-z Ni _z O ₄ (0.5<x<1.3, 0<z<2), Li From the group consisting of _x Mn _2-z Co _z O ₄ (0.5<x<1.3, 0<z<2), Li _x CoPO ₄ (0.5<x<1.3) and Li _x FePO ₄ (0.5<x<1.3) It may be any one selected or a mixture of two or more of these, and the lithium-containing transition metal oxide may be coated with a metal such as aluminum (Al) or a metal oxide. In addition, in addition to the lithium-containing transition metal oxide, one or more types selected from the group consisting of sulfide, selenide, and halide may also be used.

The positive electrode active material may be included in the range of 94.0 to 98.5% by weight in the positive electrode active material layer. When the content of the positive electrode active material satisfies the above range, it is advantageous in terms of manufacturing a high-capacity battery and providing sufficient conductivity of the positive electrode or adhesion between electrode materials.

The current collector used in the positive electrode is a highly conductive metal, to which the positive electrode active material slurry can easily adhere, and any metal that is non-reactive within the voltage range of the electrochemical device can be used. Specifically, non-limiting examples of the positive electrode current collector include foil made of aluminum, nickel, or a combination thereof.

The positive active material layer further includes a conductive material. The conductive material is typically added in an amount of 1 to 30% by weight based on the total weight of the mixture including the positive electrode active material. These conductive materials are not particularly limited as long as they have conductivity without causing chemical changes in the secondary battery. For example, the conductive material includes graphite such as natural graphite or artificial graphite; Carbon black, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; One or more types selected from the group consisting of polyphenylene derivatives, etc. may be used.

The negative electrode has a structure in which a two-layer negative electrode active material layer is laminated on a negative electrode current collector. In one example, the negative electrode active material layer includes a negative electrode active material, a conductive material, and a binder polymer, and, if necessary, may further include a negative electrode additive commonly used in the art.

The negative electrode active material may include carbon material, lithium metal, silicon, or tin. When a carbon material is used as a negative electrode active material, both low-crystalline carbon and high-crystalline carbon can be used. Representative low-crystalline carbons include soft carbon and hard carbon, and high-crystalline carbons include natural graphite, Kish graphite, pyrolytic carbon, and liquid crystal pitch carbon fiber. Representative examples include one or more types of high-temperature fired carbon selected from the group consisting of (mesophase pitch based carbon fiber), carbon microbeads, liquid crystal pitches, and petroleum orcoal tar pitch derived cokes. am.

Non-limiting examples of the current collector used in the negative electrode include foil made of copper, gold, nickel, or copper alloy, or a combination thereof. Additionally, the current collector may be used by laminating substrates made of the above materials.

Additionally, the cathode may include conductive materials and binders commonly used in the field.

Meanwhile, the rolling apparatus 100 for manufacturing an electrode according to an embodiment of the present invention includes a guide member 140 that guides the movement of the electrode substrate 10. The guide member 140 may be, for example, a transfer roller. The guide member 140 may control the meandering of the electrode base 10 or the tension of the electrode base 10. Finally, the electrode substrate 10 is rewinded by the electrode rewinder 150.

The electrode manufactured by applying the control method of the rolling device for electrode production according to the present embodiment described above may be included in a secondary battery, and a plurality of such secondary batteries may be gathered to form a battery module. The battery module may be mounted with various control and protection systems such as a battery management system (BMS) and a cooling system to form a battery pack.

The secondary battery, the battery module, or the battery pack can be applied to various devices. Specifically, it can be applied to transportation means such as electric bicycles, electric vehicles, and hybrids, but is not limited to this and can be applied to various devices that can use secondary batteries.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

10: Electrode substrate
11: Mujibu
12: maintenance part
100: Rolling device for electrode manufacturing
110: Rolled member
120: Non-elongated member
120a: pressurizing part
130: monitoring unit
130a: processor
140: Guide member
150: Electrode rewinder

Claims (20)

In the rolling device for producing electrodes,
A rolling member that rolls the electrode substrate as it passes through; and
It includes an uncoated portion stretching member that additionally extends the uncoated portion of the electrode base that has passed through the rolling member,
A rolling device for manufacturing an electrode, wherein the relative position of the uncoated stretching member relative to the electrode substrate is adjusted according to the state of the uncoated portion of the electrode substrate. According to paragraph 1,
It further includes a driving unit that adjusts the position of the non-coated stretching member,
A rolling device for manufacturing an electrode, wherein the position of the non-coated stretching member is adjusted by maintaining the position, advancing toward the electrode base, or moving backward from the electrode base in the opposite direction. According to paragraph 2,
It further includes a monitoring unit that monitors the electrode substrate to determine the state of the uncoated portion of the electrode substrate,
When the uncoated portion of the electrode base is in a normal state, the uncoated portion stretching member maintains its position,
When the uncoated portion of the electrode base is in a predetermined first abnormal state, the uncoated portion stretching member advances toward the electrode base,
A rolling device for producing an electrode, wherein when the uncoated portion of the electrode base is in a predetermined second abnormal state, the uncoated portion stretching member moves backward from the electrode base. According to paragraph 3,
The first abnormal state is a state in which valleys or ridges of the swell of the uncoated portion occur in the longitudinal direction of the electrode base,
The second abnormal state is a rolling device for manufacturing an electrode in which valleys or ridges of swells of the uncoated portion occur in the width direction of the electrode base material. According to paragraph 3,
When the angle between the direction of the valley or crest of the swell of the uncoated portion and the direction of progress of the electrode base is 0 degrees or more and less than 45 degrees, the uncoated portion is determined to be in a first abnormal state,
When the angle between the direction of the valley or crest of the swell of the uncoated portion and the direction of progress of the electrode base is greater than 45 degrees and less than or equal to 90 degrees, the uncoated portion is determined to be in a second ideal state,
When the angle between the direction of the valley or crest of the swell of the uncoated portion and the moving direction of the electrode base is 45 degrees, the uncoated portion is determined to be in one of the first ideal state and the second ideal state. According to paragraph 3,
When the uncoated portion of the electrode base is in a first predetermined abnormal state, the uncoated portion stretching member advances toward the electrode base by a first predetermined value,
A rolling device for manufacturing an electrode, wherein the advancement of the uncoated portion stretching member by the first predetermined value is repeatedly performed until the uncoated portion of the electrode base is determined to be in a normal state. According to paragraph 3,
When the uncoated portion of the electrode base is in a second predetermined abnormal state, the uncoated portion stretching member moves backward from the electrode base by a second predetermined value,
A rolling device for manufacturing an electrode, wherein the uncoated portion stretching member is repeatedly retracted by the second predetermined value until the uncoated portion of the electrode base is determined to be in a normal state. According to paragraph 3,
The monitoring unit is located at a rear end of the uncoated portion stretching member and monitors the state of the uncoated portion of the electrode base that has passed through the uncoated portion stretching member,
Accordingly, the rolling device for manufacturing an electrode in which the position of the non-coated stretching member is adjusted. According to paragraph 3,
The monitoring unit is located between the rear end of the rolling member and the front end of the uncoated stretching member to monitor the state of the uncoated portion of the electrode base that has passed through the rolling member,
Accordingly, the rolling device for manufacturing an electrode in which the position of the non-coated stretching member is adjusted. According to paragraph 1,
The rolling member is a pair of rolling rollers rotating in opposite directions about a rotation axis,
The non-coated stretching member is a non-coated portion pressing roller including a pressing portion,
A rolling device for manufacturing an electrode, wherein the pressing portion is provided at a position corresponding to an uncoated portion of the electrode base material and has a structure that protrudes from an outer peripheral surface of the uncoated portion pressing roller. According to clause 10,
A rolling device for manufacturing an electrode, wherein the driving unit is an actuator connected to the non-coated portion pressing roller. According to paragraph 1,
A rolling device for manufacturing an electrode, further comprising a guide member that guides movement of the electrode base. According to paragraph 1,
A rolling device for manufacturing an electrode, further comprising an electrode rewinder for winding and recovering the electrode base material. In the rolling method for manufacturing electrodes,
Rolling the electrode substrate with a rolling member; and
Additional stretching of the uncoated portion of the rolled electrode base using an uncoated portion stretching member; and
Monitoring the electrode substrate with a monitoring unit to determine the state of the uncoated portion of the electrode substrate,
When the state of the uncoated portion of the electrode substrate is abnormal, the rolling method for manufacturing an electrode further includes the step of adjusting the relative position of the uncoated portion stretching member relative to the electrode substrate. According to clause 14,
A rolling method for producing an electrode, wherein when the uncoated portion of the electrode base is in a normal state, the uncoated portion stretching member maintains its position. According to clause 14,
The step of adjusting the relative position of the non-part stretching member is:
When the uncoated portion of the electrode substrate is in a predetermined first abnormal state, the uncoated portion stretching member advances toward the electrode substrate; and
A rolling method for producing an electrode, comprising at least one step of retracting the uncoated portion stretching member toward the electrode substrate when the uncoated portion of the electrode base is in a predetermined second ideal state. According to clause 14,
The first abnormal state is a state in which valleys or ridges of the swell of the uncoated portion occur in the longitudinal direction of the electrode base,
The second abnormal state is a rolling method for manufacturing an electrode in which valleys or crests of swells of the uncoated portion occur in the width direction of the electrode base material. According to clause 14,
When the angle between the direction of the valley or crest of the swell of the uncoated portion and the moving direction of the electrode base is 0 degrees or more and less than 45 degrees, the uncoated portion is determined to be in a first abnormal state,
When the angle between the direction of the valley or crest of the swell of the uncoated portion and the direction of progress of the electrode base is greater than 45 degrees and less than or equal to 90 degrees, the uncoated portion is determined to be in a second ideal state,
When the angle between the direction of the valley or crest of the swell of the uncoated portion and the moving direction of the electrode base is 45 degrees, the uncoated portion is determined to be in one of the first ideal state and the second ideal state. According to clause 14,
When the uncoated portion of the electrode base is in a first predetermined abnormal state, the uncoated portion stretching member advances toward the electrode base by a first predetermined value,
A rolling method for producing an electrode, wherein the advancement of the uncoated portion stretching member by the first predetermined value is repeatedly performed until the uncoated portion of the electrode base is determined to be in a normal state. According to clause 14,
When the uncoated portion of the electrode base is in a second predetermined ideal state, the uncoated portion stretching member retracts from the electrode base by a second predetermined value,
A rolling method for manufacturing an electrode, wherein the uncoated portion stretching member is repeatedly retracted by the second predetermined value until the uncoated portion of the electrode base is determined to be in a normal state.