KR20190134068A - Manufacturing method and apparatus for electrode stack - Google Patents

Abstract

The present invention relates to a method for manufacturing an electrode assembly, configured such that a positive electrode and a negative electrode, on which a holding portion coated with an active material and an uncoated portion uncoated with the active material are continuously formed on each of upper and lower surfaces of a current collector, are wound together with a separation membrane at the core to be manufactured into an electrode assembly. The method comprises the steps of: fixing ends of a positive electrode, a negative electrode, and a separation membrane to a core; rotating the core to wind the positive electrode, the negative electrode, and the separation membrane in a stacked state; monitoring occurrence of a defect while the positive electrode and the negative electrode are introduced; and cutting, when the positive electrode, the negative electrode, and the separation membrane having a predetermined length are introduced, each of the positive electrode, the negative electrode, and the separation membrane. In the step of monitoring, a defect is determined by checking whether mismatch, which is a distance between an end location of a holding portion applied on an upper surface of the electrode and an end location of a holding portion applied on a lower surface of the corresponding electrode, is within a predetermined range while the electrode is wound around the core. In addition, the present invention provides an apparatus for manufacturing an electrode assembly. According to the present invention, it is possible to reduce a defect rate of a secondary battery having an electrode assembly embedded therein.

Description

Manufacturing method and apparatus for manufacturing electrode assembly {Manufacturing method and apparatus for electrode stack}

The present invention relates to a manufacturing method and a manufacturing apparatus of an electrode assembly, which is caused by a mismatch which is a difference between an end position of a holding part applied to an upper surface of an electrode (cathode and an anode) and an end position of a holding part applied to a lower surface. The present invention relates to a manufacturing method and apparatus for manufacturing an electrode assembly which can determine the occurrence of good and defective products.

Lithium secondary batteries that are capable of charging and discharging, light weight, and high energy density and output density have been widely used as energy sources of various devices.

In addition, hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (HDVs) are used as alternatives to solve the air pollution and greenhouse gas problems of existing internal combustion engine cars using fossil fuels such as gasoline and diesel vehicles. BEV) and electric vehicles (EVs) have been proposed. Secondary batteries are also attracting attention as a power source for such internal combustion engine replacement vehicles.

Secondary batteries are classified into cylindrical, rectangular, or pouch types according to the shape of the outer material in which the electrode assembly is accommodated. Typically, the electrode assembly used in the rectangular secondary battery includes a positive electrode, a separator, and a negative electrode.

The positive electrode is made to repeat the holding portion (anode coating portion) and the uncoated uncoated portion coated with the positive electrode active material on the positive electrode current collector, and the negative electrode, similarly, the holding portion (cathode coating portion) coated with the negative electrode active material on the negative electrode current collector The uncoated and uncoated portion is made to repeat. Electrode tabs are processed by the notching device of the positive electrode and the negative electrode, and the negative electrode and the positive electrode are laminated in a state separated by a separator. The separator insulates between the positive electrode and the negative electrode but causes an electrochemical reaction by allowing active material ions to be exchanged between the electrode plates.

Meanwhile, a method of manufacturing an electrode assembly through a separator between the cathode and the anode includes cutting the cathode, the anode, and the separator into a required size, and sequentially stacking the cathode, the anode, and the separator in a state in which the cathode, the anode, and the separator are continuously supplied. BACKGROUND OF THE INVENTION A method of manufacturing a cathode, an anode, and a separator by winding (winding) at the core is widely known.

In the conventional winding method, the anode, the cathode, and the separator are each unrolled from the feed rollers (unwinded) and are configured to be continuously supplied, but the ends of each of the anode, the cathode, and the separator are fixed at the core, and the core is rotated. And is wound (wound) by a predetermined number of revolutions and configured to produce a cylindrical electrode assembly.

Therefore, the apparatus for manufacturing an electrode assembly (having a jelly roll form) manufactured by a winding method, as shown in FIG. 1A, is unwound in a state where each of the cathode 3, the anode 2, and the separator 4 is wound. When the ends of the feed rollers 2a, 3a, and 4a, the cathode 3, the anode 2, and the separator 4 are fixed, the coils 3 are wound around the cathode 3, the anode 2, and the separator 4 The core 5 made of the assembly, disposed between the feed rollers 2a, 3a, 4a and the core 5, maintains an appropriate tension while the negative electrode 3, the positive electrode 2, and the separator 4 are supplied. And guide rollers to guide in the direction toward the core, the cathode, the anode, a cutter (not shown) for cutting if the separator is wound by a predetermined length.

On the other hand, when manufactured by such a winding method, a mismatch (see FIG. 1B), which is a distance between the end position of the holding part applied to the upper surface of the electrode (each anode and the cathode) and the end position of the holding part applied to the lower surface, is allowed. Beyond the range, there was a possibility that a reverse defect between the positive electrode and the negative electrode (a defect in which one of the negative electrode and the positive electrode was wound in a state longer than a predetermined length, resulting in contact between the negative electrode and the positive electrode).

In order to prevent this, the length of the holding part is detected in the slitting process (the electrode is cut to have a predetermined width) before the winding process, but the upper and lower surfaces of the electrode are not directly compared and inspected. There was a problem that it was difficult to detect a defect beforehand.

Accordingly, the present invention has a main object to provide a method and apparatus for manufacturing an electrode assembly which can immediately detect the occurrence of a defect due to mismatch so as to solve the conventional problems.

In order to achieve the above object, the present invention provides an electrode assembly in which a positive electrode and a negative electrode which are continuously formed on upper and lower surfaces of a holding unit coated with an active material and an uncoated non-coating active material on a surface of a current collector are wound together with a separator. A method of manufacturing an electrode assembly manufactured by the method comprising: fixing an end of a cathode, an anode, and a separator to a core; Rotating the wound core to wind the cathode, cathode, and separator in a stacked state; Monitoring the occurrence of failure while the positive and negative electrodes are injected; And cutting each of the anode, the cathode, and the separator when the anode, the cathode, and the separator are input by a predetermined length. In the monitoring, the electrode (ie, the cathode or the anode) of the corresponding electrode is wound during the winding of the core. The defect is judged by whether or not the mismatch which is the distance between the end position of the holding part applied to the upper surface and the end position of the holding part applied to the lower surface of the electrode is within a predetermined range.

That is, in the monitoring step, the defect is determined whether or not the mismatch, which is the distance between the end position of the holding portion applied to the upper surface of the positive electrode and the end position of the holding portion applied to the lower surface of the positive electrode, is in a predetermined range during the section wound around the core. At the same time as the determination, a defect is determined by whether or not a mismatch, which is a distance between the end position of the holding portion applied to the upper surface of the cathode and the end position of the holding portion applied to the lower surface of the cathode, is within a predetermined range.

At this time, the mismatch calculation of the negative electrode and the positive electrode is performed independently, and the failure determination criteria may be set differently. In addition, failure determination by mismatch may be performed at both the cathode and the anode, or at only one of the cathode and the anode, depending on the situation of the production process.

In the present invention, the mismatch is calculated as a variable between the time difference between the time point of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface and the input speed of the cathode and the anode.

And, the time difference between the point of time when the detection of the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface, and optically detects the boundary of the uncoated portion and the holding portion disposed at a specific position of the upper side Monitored by the first vision and the second vision disposed at a specific position of the lower side, the feed rate of the cathode and anode is rotated while feeding the cathode and anode while the cathode and anode are wound at the core, respectively. It can be calculated from the number of revolutions.

In addition, if it is determined that the defective further comprises the step of discharging the electrode assembly manufactured by winding in the core and separated from the electrode assembly determined to be good. Accordingly, in the manufacturing method of the present invention, defects may occur and the production may be maintained continuously without interruption of the process.

In addition, if it is determined that the failure is a step of visually or auditory warning of the failure is optionally further included, the process manager can quickly identify the failure.

In addition, in the manufacturing method of the present invention, if it is determined to be defective, the step of determining whether the mismatch can be corrected by varying the winding lengths of the cathode and the anode, and if the correction is possible, the wound length of the cathode and the anode to offset the mismatch. It may include the step of cutting by changing the cutting position of the cathode or anode to be different.

That is, even if a defect caused by mismatch occurs, if it is determined that the defect can be corrected by adjusting the winding lengths of the negative electrode and the positive electrode, it is possible to reduce the mass production of the defective product through the correction of the defect in the production stage.

In addition, the present invention further provides an apparatus for manufacturing an electrode assembly. In the apparatus for manufacturing an electrode assembly according to the present invention, an anode and a cathode electrode, each of which is continuously formed on a surface of a current collector and an uncoated portion on which an active material is uncoated, are wound on a core together with a separator to form an electrode. An apparatus for manufacturing an electrode assembly manufactured by assembly, the apparatus comprising: a winding core for winding the positive electrode, the negative electrode, and the separator by rotating in a state where the ends of the positive electrode, the negative electrode, and the separator are fixed together; A transfer unit for introducing the electrode into the core by the rotational force of the built-in transfer motor; A first vision for sensing an end unit value of the holding part applied to the upper surface of the electrode while the electrode is being injected; A second vision for sensing an end unit value of the holding part applied to the lower surface of the electrode while the electrode is input; And analyzing the data of the first vision and the second vision to determine whether the mismatch, which is the distance between the end position of the holding part applied to the upper surface of the electrode wound at the core and the end position of the holding part applied to the lower surface, is within a predetermined range. And a controller for determining a defect of the electrode assembly wound around the core.

The cutter further includes a cutter disposed between the core and the transfer part to cut the electrode introduced into the core, and the cutter is configured to slide between the core and the transfer part.

In addition, further comprising a guide roller for guiding the electrode to be moved to bend toward the winding core, the conveying portion is disposed between the guide roller and the winding core.

In addition, the guide roller, the transfer unit, the first vision, the second vision, the cutter is installed in each of the supply line of the cathode and anode.

In the manufacturing method of the present invention, the control unit compares the mismatch of the negative electrode and the mismatch of the positive electrode, and determines whether the defect can be corrected by the difference between the length of the negative electrode and the positive electrode being wound, and if the defective correction is possible, The cutter is controlled so that the difference in length of the cathode occurs.

The control unit calculates the winding amount of the electrode by the rotational speed of the transfer motor, the failure determination range of the mismatch may be determined differently according to the winding amount of the electrode when the failure is determined according to the mismatch.

According to the present invention having the above-described configuration, it is possible to directly determine whether or not defects are produced at the same time as the production of the electrode assembly, thereby reducing the defective rate of the secondary battery in which the electrode assembly is embedded. In other words, in the production process of the electrode assembly, it is possible to monitor the occurrence of the failure of the electrode assembly due to mismatch in real time, it is possible to trend management throughout the production process.

In addition, according to the production situation, both the negative electrode and the positive electrode or only one of the negative electrode and the positive electrode can be selectively inspected, it is possible to maximize the production efficiency according to the production quality of the wound electrode. For example, it is possible to monitor the occurrence of the defect by selecting only the electrode that has more defects in the whole process than the other electrode, or to monitor both electrodes (anode and cathode).

In the present invention, the mismatch calculation of the negative electrode and the positive electrode is made independently and the defect determination criteria may be set differently, and the defect determination by the mismatch is performed on both the negative electrode and the positive electrode according to the situation of the production process, Since it can be carried out only at one place, it is possible to flexibly determine whether or not the defect is in accordance with the required quality standards of the electrode assembly.

According to the present invention, the time difference between the time point of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface and the feeding speed of the negative electrode and the positive electrode, and while the negative electrode and the positive electrode are wound in the core Since it is calculated from the rotational speed of the feed motor that rotates the cathode and the anode, respectively, it is possible to calculate the mismatch with high accuracy without any external variables.

And, the defect can be corrected to further lower the defective rate.

Figure 1a is a simplified view showing a state in which a jelly roll type electrode assembly is manufactured in a conventional manner.
1B is a perspective view showing a side view of an electrode (anode and cathode) fed into the core;
Figure 2 is a front view showing a simplified view of the manufacturing apparatus according to a preferred embodiment of the present invention.
3 is a flow chart of a manufacturing method according to a preferred embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

Also, the terms or words used in the specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly define the concept of terms in order to explain their invention in the best way. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

As shown in FIG. 1B, two electrodes (1: 2 [anode] and 3 [cathode] formed on the surface of the current collector and the non-coating portion on which the active material is coated and the uncoated non-active material are respectively formed on the upper and lower surfaces thereof are continuously formed. The present invention relates to an apparatus and a method for manufacturing an electrode assembly, which is wound at the core together with a separator and manufactured from the electrode assembly. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1

In the present invention, as an embodiment 1 provides an apparatus for producing an electrode assembly. Referring to FIG. 2, the electrode assembly manufacturing apparatus according to the present invention manufactures an electrode assembly by winding two electrodes 1, a cathode 3, an anode 1, and a separator 4, in a core 10. , Characterized in that it comprises a transfer unit 20, vision (30, 40), the control unit (50). In addition, the electrodes 1 have a structure in which the holding part coated with the active material on the surface of the current collector and the non-coating part uncoated with the active material are continued on each of the upper and lower surfaces.

The two electrodes 1 are supplied in opposite directions to approach toward each other, and are configured to be fed toward the core 10 in a bent state by the guide roller 70 at an appropriate position.

The core 10 is rotated by the control unit 50 to be described later, and rotates in a state where the ends of the anode 2, the cathode 3, and the separator 4 are fixed together, so that the anode 2 and the cathode ( 3) The separator 4 is wound up to produce an electrode assembly having a required thickness.

In addition, a transfer unit 20 is provided to maintain a suitable tension while maintaining a suitable supply speed while the anode 2 and the cathode 3 are supplied to the winding core 10. The transfer unit 20 includes a transfer motor (not shown) whose rotation is controlled by the control unit 50 and injects each electrode (1: 2, 3) into the core 10 by the rotational force of the transfer motor.

In addition, each of the electrodes 1 has a first vision 30 and a second vision 40 are disposed on the path to be supplied. The first vision 30 senses the end unit value of the holding part applied to the upper surface of the electrode 1 while the electrodes 1: 2 and 3 are injected, and the second vision 40 is the lower side of the electrode 1. It is configured to sense the end unit value of the holding portion applied to the surface.

The first vision 30 and the second vision 40 may sense the end unit values of the holding part optically by sensing the glossiness, reflectance, and shadow difference that a significant difference occurs between the holding part and the uncoated part. . For example, the first vision 30 and the second vision 40 may use an optical recognition camera, a photometer capable of measuring the light intensity of light, or another known sensing device.

The data sensed by the first vision 30 and the second vision 40 is transmitted to the controller 50. The controller 50 analyzes the sensed data in real time and calculates a mismatch value, which is a gap difference between the end position of the holding part applied to the upper surface and the end position of the holding part applied to the lower surface for each section of the electrode 1. Serve

The mismatch calculation includes a time difference between a time point at which the boundary between the uncoated part and the holding part is detected on the top surface and a time point at which a boundary between the uncoated part and the holding part is detected at the bottom surface thereof; And the position at which the cutter cuts; And so on. In this case, the time difference between the time point of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface may be measured through the first vision 30 and the second vision 40. , The feeding speed of each of the negative electrode 3 and the positive electrode 2 is of the transfer unit 20 for rotating the negative electrode 3 and the positive electrode 2 while the negative electrode and the positive electrode are wound in the core 10, respectively. It can be calculated from the rotational speed of the feed motor. Therefore, the transfer motor is preferably a stepping motor (stepping motor) that can easily control the rotation and detect the number of revolutions.

The controller 50 compares whether or not the calculated mismatch is within a predetermined range, and if it is within the range, determines that it is good, and if it is outside the range, determines that it is defective. In this case, the reference of the normal range may vary, and the defective reference range may vary depending on how close the mismatch value of each of the positive electrode 2 and the negative electrode 3 is to the normal range.

In addition, the apparatus of the present invention further includes a cutter (60) disposed between the core (10) and the transfer unit 20 by cutting the electrode (1) introduced into the core (10). The cutter 60 is configured to slide between the core 10 and the transfer unit 20 under the control of the controller 50. That is, the controller 50 may preset the cutting position to correct or adjust the position of the cutter 60 to avoid a portion where an abnormal mismatch occurs or to correct a defect caused by the mismatch.

As shown in FIG. 2, the guide roller 70, the transfer unit 20, the first vision 30, the second vision 40, and the cutter 60 are respectively formed of the cathode 3 and the anode 2. Although individually installed in the supply line, the control unit 50 may be individually installed in each of the lines of the negative electrode 3 and the positive electrode 2 or may be configured to be integrally controlled by one. At this time, even if the control unit is configured separately in each of the positive electrode 2 and the negative electrode 3 supply line, it is preferable that the control unit of the positive electrode and the control unit of the negative electrode is configured to communicate with each other for integrated control.

In addition, in the apparatus of the present invention, the controller 50 compares the mismatch of the negative electrode 3 and the mismatch of the positive electrode 2, and fails due to the difference in the length of the negative electrode 3 and the positive electrode 2 wound up. It may be configured to further determine if modification is possible. If it is determined that the defect correction is impossible, the corresponding electrode assembly wound and manufactured in the core (10) is discharged separately from the good product or displays a warning to inform the operator of the failure. The warning may be made through a display device displaying a warning message or a speaker that sounds a warning sound. For reference, even if the defective parts are not separated separately for the reasons of the process, a mark indicating that the defective items may be displayed to distinguish the defective products from the defective products.

On the other hand, if it is determined that the defect correction is possible by adjusting the length or cutting position of the positive electrode and the negative electrode in the control unit 50, the control unit 50 of the cutter 60 so that the difference in length between the positive electrode and the negative electrode is wound Control the position or cutting point.

Example 2

In addition, the present invention provides a method for producing an electrode assembly as Example 2. The manufacturing method according to the present invention is performed according to the steps shown in the flowchart shown in FIG. 3 through the manufacturing apparatus described above, wherein the order may be determined differently. For example, the step of informing the occurrence of the defective product may be performed before discharging the defective product, and may first move the cutter to a specific position before winding up. However, a key feature of the manufacturing method according to the present invention is that defects due to mismatches are monitored in real time while the electrode assembly is manufactured according to the rotation of the core.

First, the two electrodes 1 and the separator 4 are fixed to the core 10, and then the core 10 is rotated at an appropriate speed so that the anode 2, the cathode 3, and the separator 4 are stacked. Start winding in a state. And, while the winding core 10 is rotated so that the electrodes 1 are supplied, defects are monitored in each of the anode 2 and the cathode 3, and the anode 2, the cathode 3, and the separator 4 are monitored. When input by this predetermined length, it is comprised so that each of the anode 2, the cathode 3, and the separator 4 may be cut | disconnected.

In this case, the monitoring is a mismatch that is a distance between the end position of the holding part applied to the upper surface of the electrode (ie, the cathode or the positive electrode) and the end position of the holding part applied to the lower surface of the electrode during the section wound on the winding core 10. The defect is determined by whether or not is within a predetermined range.

That is, in the monitoring step, the mismatch, which is the distance between the end position of the holding portion applied to the upper surface of the anode 2 and the end position of the holding portion applied to the lower surface of the anode 2, is preliminarily during the section wound around the core 10. The mismatch is determined within the predetermined range and the mismatch, which is the distance between the end position of the holding portion applied to the upper surface of the negative electrode 3 and the end position of the holding portion applied to the lower surface of the negative electrode 3, is within a predetermined range. It is determined whether there is a defect.

At this time, the mismatch calculation of the cathode 3 and the anode 2 is performed independently, and the failure determination criteria may be set differently. In addition, failure determination by mismatch may be performed at both the supply line of the cathode 3 and the anode 2 or may be performed at only one of the supply lines of the cathode and the anode according to the situation of the production process.

As described above, the mismatch is calculated as a variable between the time difference between the time point of detecting the boundary of the uncoated portion and the holding portion at the top surface and the time point of detecting the boundary of the uncoated portion and the holding portion at the bottom surface and the input speed of the cathode and the anode. . The time difference between the time point of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface is a first position disposed at a specific position on the upper side by optically detecting the boundary of the uncoated portion and the holding portion. Monitored through the vision (30) and the second vision (40) disposed at a specific position on the lower side, the feed rate of the cathode and anode is rotated by feeding the cathode and anode respectively while the cathode and anode are wound in the core Can be calculated from the rotational speed of the feed motor.

On the other hand, the present invention further comprises the step of discharging the electrode assembly manufactured by winding in the core separated from the electrode assembly determined to be good if determined to be defective. Accordingly, in the manufacturing method of the present invention, defects may occur and the production may be maintained continuously without interruption of the process.

In addition, if it is determined that the failure is a step of visually or auditory warning of the failure is optionally further included, the process manager can quickly identify the failure.

In addition, in the manufacturing method of the present invention, if it is determined to be defective, the step of determining whether the mismatch can be corrected by varying the winding lengths of the cathode and the anode, and if the correction is possible, the wound length of the cathode and the anode to offset the mismatch. It may include the step of cutting by changing the cutting position of the cathode or anode to be different. That is, even if a defect occurs due to mismatch, if it is determined that the defect can be corrected by adjusting the winding lengths of the cathode and the anode, the mass production of the defective product can be reduced by correcting the defect by controlling the cutter 60 in the production stage. .

According to the present invention having the above-described configuration, it is possible to directly determine whether or not defects are produced at the same time as the production of the electrode assembly, thereby reducing the defective rate of the secondary battery in which the electrode assembly is embedded.

In addition, according to the production situation, both the negative electrode and the positive electrode or only one of the negative electrode and the positive electrode can be selectively inspected, it is possible to maximize the production efficiency according to the production quality of the wound electrode. For example, it is possible to monitor the occurrence of the defect by selecting only the electrode that has more defects in the whole process than the other electrode, or to monitor both electrodes (anode and cathode).

In the present invention, the mismatch calculation of the negative electrode and the positive electrode is made independently and the defect determination criteria may be set differently, and the defect determination by the mismatch is performed on both the negative electrode and the positive electrode according to the situation of the production process, Since it can be carried out only at one place, it is possible to flexibly determine whether or not the defect is in accordance with the required quality standards of the electrode assembly.

According to the present invention, the time difference between the time point of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface and the feeding speed of the negative electrode and the positive electrode, and while the negative electrode and the positive electrode are wound in the core Since it is calculated from the rotational speed of the feed motor that rotates the cathode and the anode, respectively, it is possible to calculate the mismatch with high accuracy without any external variables.

And, the defect can be corrected to further lower the defective rate.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto, and the technical concept of the present invention and the following will be described by those skilled in the art to which the present invention pertains. Various implementations are possible within the scope of equivalents of the appended claims.

1 electrode (2: anode, 3: cathode)
4: separator
10: core
20: transfer unit
30: First Vision
40: Second Vision
50: control unit
60: cutter

Claims (14)

In the manufacturing method of the electrode assembly in which the holding portion coated with the active material on the surface of the current collector and the non-coating portion uncoated with the active material are respectively wound on the upper and lower portions of the collector and the separator are wound in the core together with the separator.
Fixing the ends of the positive electrode, the negative electrode, and the separator to the core;
Rotating the wound core to wind the cathode, cathode, and separator in a stacked state;
Monitoring the occurrence of failure while the positive and negative electrodes are injected; And
And cutting each of the anode, the cathode, and the separator when the anode, the cathode, and the separator are input by a predetermined length.
In the monitoring step, the defect is determined whether or not the mismatch, which is the distance between the end position of the holding portion applied to the upper surface of the electrode and the end position of the holding portion applied to the lower surface of the electrode, during the section wound around the core. A method for producing an electrode assembly, characterized in that the determination.
The method of claim 1,
The mismatch is an electrode assembly, characterized in that the time difference between the time of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time of detecting the boundary of the uncoated portion and the holding portion on the lower surface and the input speed of the negative electrode and the positive electrode Manufacturing method.
The method of claim 2,
The time difference between the time point of detecting the boundary of the uncoated portion and the holding portion on the upper surface and the time point of detecting the boundary of the uncoated portion and the holding portion on the lower surface is a first position disposed at a specific position on the upper side by optically detecting the boundary of the uncoated portion and the holding portion. A method of manufacturing an electrode assembly, characterized in that monitored through the vision and the second vision disposed at a specific position on the lower side.
The method of claim 2,
The cathode and anode injection speed is calculated from the rotational speed of the feed motor for rotating the negative electrode and the positive electrode while the negative electrode and the positive electrode is wound around the core, respectively.
The method according to any one of claims 1 to 4,
And discharging the electrode assembly manufactured by winding the core assembly separately from the electrode assembly judged as good if it is determined to be defective.
The method of claim 5,
If it is determined that the failure is a visual or audio warning of the occurrence of the failure; manufacturing method of the electrode assembly further comprising.
The method according to any one of claims 1 to 4,
If it is determined to be defective, the mismatch determines whether the correction is possible by varying the winding lengths of the cathode and the anode; And
And changing the cutting position of the negative electrode or the positive electrode so that the wound length of the negative electrode and the positive electrode is changed so as to offset the mismatch if possible to correct the mismatch.
In the electrode assembly manufacturing apparatus in which the holding portion coated with the active material on the surface of the current collector and the non-coating portion uncoated with the active material are wound on each other, the positive electrode and the negative electrode which are continuously formed are wound together at the core together with the separator to produce an electrode assembly. ,
Winding to wind the positive electrode, the negative electrode, and the separator by rotating while the ends of the positive electrode, the negative electrode, and the separator are fixed together;
A transfer unit for introducing the electrode into the core by the rotational force of the integrated transfer motor;
A first vision for sensing an end unit value of the holding part applied to the upper surface of the electrode while the electrode is being injected;
A second vision for sensing an end unit value of the holding part applied to the lower surface of the electrode while the electrode is input; And
Analyzing the data of the first vision and the second vision to determine whether the mismatch which is the distance between the end position of the holding part applied to the upper surface of the electrode wound at the core and the end position of the holding part applied to the lower surface is within a predetermined range. And a control unit for determining a defect of the electrode assembly wound in the core.
The method of claim 8,
And a cutter disposed between the winding core and the transfer unit to cut the electrode introduced into the winding core.
The method of claim 9,
The cutter is an apparatus for manufacturing an electrode assembly, characterized in that the slide between the core and the transfer portion.
The method of claim 10,
Further comprising a guide roller for guiding the electrode to be moved to bend toward the winding core,
The transfer unit is an electrode assembly manufacturing apparatus, characterized in that disposed between the guide roller and the core.
The method of claim 11,
The guide roller, the transfer unit, the first vision, the second vision, the cutter is an electrode assembly manufacturing apparatus, characterized in that installed separately in the supply line of the cathode and anode.
The method of claim 12,
The control unit compares the mismatch of the negative electrode and the mismatch of the positive electrode, determines whether the defect can be corrected by the difference between the length of the negative electrode and the positive electrode being wound,
The apparatus for manufacturing an electrode assembly, characterized in that for controlling the cutter so that the length difference between the positive electrode and the negative electrode to be wound if possible.
The method according to any one of claims 8 to 13,
The control unit calculates the winding amount of the electrode by the rotational speed of the transfer motor, the electrode assembly manufacturing apparatus, characterized in that the failure determination range of the mismatch is determined differently according to the winding amount of the electrode when the failure according to the mismatch.

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