KR20190143253A - Manufacturing method and apparatus for electrode stack - Google Patents

Abstract

The present invention relates to a manufacturing method, that is, a manufacturing method for an electrode assembly, for winding a positive pole, a negative pole, and a separator together and manufacturing the same into an electrode assembly, by comprising: a step of setting individual inputs of a positive pole, a negative pole, and a separator during winding; a step of fixing the end of the positive pole, the negative pole, and the separator to a core; a step of rotating the core and winding the positive pole, the negative pole, and the separator together; a step of monitoring the input state of the positive pole and the negative pole respectively while the positive pole and the negative pole are inserted; a step of cutting the positive pole, the negative pole, and the separator respectively; and a defect determining step of calculating an end interval, that is, a distance difference between the end position of the cut positive pole and the end position of the cut negative pole, and determining a defect by whether the calculated end interval is within a predetermined range or not. In addition, the present invention relates to a manufacturing device, that is, a manufacturing device for an electrode assembly, comprising: a core rotating in a state in which the ends of the positive pole, the negative pole, and the separator are fixed together, to wind the positive pole, the negative pole, and the separator; a transfer unit inserting the electrodes into the core by rotational force of an embedded transfer motor; a cutter cutting the electrodes inserted into the core and placed between the core and the transfer unit; and a control unit calculating an end interval, that is, a distance difference between the end position of the cut positive pole and the end position of the cut negative pole by using the number of rotations of the transfer motor of the positive pole and the transfer motor of the negative pole, respectively, and the position of the cutter of the positive pole and the cutter of the negative pole, as variables, and determining a defect by whether the calculated end interval is within a predetermined range or not. Therefore, the manufacturing method for an electrode assembly and the manufacturing device thereof can immediately detect a misalignment defect (and a mismatch defect).

Description

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

The present invention relates to a method and apparatus for manufacturing an electrode assembly, wherein the longitudinal end spacing of the electrodes (cathode and anode) wound together with the separator (distance between the end position of the cut anode and the end position of the cut cathode) The present invention relates to a method and apparatus for manufacturing an electrode assembly capable of determining a misalignment defect caused by a difference) and sorting out good and defective products.

Lithium secondary batteries capable of charging and discharging, light weight, high energy density and high 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 (ALVs) are used as alternatives to solve 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. Lithium secondary batteries are also attracting attention as a power source of such internal combustion engine replacement vehicles.

Lithium secondary batteries are classified into lithium ion batteries using liquid electrolytes and lithium polymer batteries using polymer electrolytes according to the type of electrolyte, and are classified into cylindrical, square or pouch types according to the shape of the exterior material in which the electrode assembly is accommodated.

Typically, the electrode assembly employed in the rectangular secondary battery includes a positive electrode, a separator, 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 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.

The method of manufacturing an electrode assembly through a separator between the cathode and the anode includes a method of sequentially cutting the cathode, the anode, and the separator to a required size, and sequentially stacking the cathode, the cathode, the anode, and the separator being continuously supplied, BACKGROUND OF THE INVENTION A method of manufacturing 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 supply rollers (unwinded) and are continuously supplied, but the ends of each of the anode, the cathode, and the separator are fixed at the core, and the core is pre-determined. It is configured to produce a cylindrical electrode assembly wound (wound) by the rotational speed.

Accordingly, the apparatus for manufacturing an electrode assembly (having a jelly roll form) manufactured by a winding method may be supplied in a state in which each of the cathode 3, the anode 2, and the separator 4 is unwound as shown in FIG. 1A. Rollers 2a, 3a, 4a; A winding core 5 which is rotated when the ends of the cathode 3, the anode 2, and the separator 4 are fixed to wind the cathode 3, the anode 2, and the separator 4 into an electrode assembly; A guide roller disposed between the feed rollers 2a, 3a, and 4a and the core 5 to maintain a proper tension while feeding the cathode 3, the anode 2, and the separator; And a cutter (not shown) for cutting the cathode 3, the anode 2, and the separator 4 when the membrane 4 is wound by a predetermined length.

On the other hand, when manufactured by such a winding method, there was a possibility that misalignment defects (defects due to the difference between the ends of the cathode and the anode) of the electrodes (each anode and the cathode) were generated. That is, as shown in FIG. 1B, the cutting should be performed in a state where the end of the cathode 3 is supplied longer by a predetermined length so that the end of the cathode 3 protrudes from the end of the anode 2, but the reaction speed of the cutter and the anode when the feed is performed. There is a problem that the gap between the ends of the positive electrode 2 and the negative electrode 3 is formed to be smaller than the reference value or reversed due to the tension difference formed in the anode and the negative electrode. This is caused by a reverse defect between the positive electrode and the negative electrode (precipitation of lithium during overcharging). To increase the capacity of the cathode, the cathode must protrude longer, but the anode protrudes longer than the set length, which causes the contact between the cathode and the anode.

Accordingly, in the prior art before and after the production of the electrode assembly, some of the production quantity is selected and sample inspection, but it was difficult to find all the defective products by sample inspection.

In addition, despite the inspection in the slitting process before the winding process, mismatch defect (defect that the gap between the end position of the holding portion applied to the upper surface and the end position of the holding portion applied to the lower surface is larger than the allowable value, Fig. 3 This also required measures.

Accordingly, the present invention is to provide a method and apparatus for manufacturing an electrode assembly capable of immediately detecting misalignment defects (and mismatch defects) so as to solve the conventional problems.

In order to achieve the above object, the present invention provides a method of manufacturing an electrode assembly, which is wound into a cathode, an anode, and a separator together to produce an electrode assembly, the method comprising: setting an input amount of each of the anode, the cathode, and the separator during winding; Fixing the ends of the positive electrode, the negative electrode, and the separator to the core; Rotating the winding core to wind the positive electrode, the negative electrode, and the separator together; Monitoring the input state of each of the positive and negative electrodes while the positive and negative electrodes are injected; Cutting each of the positive electrode, the negative electrode, and the separator; And a defect determination step of calculating an end interval which is a distance difference between the end position of the cut anode and the end position of the cut cathode, and determining a failure by whether the calculated end interval is within a predetermined range. It is done.

In the present invention, the calculation of the end interval is calculated by the variables of the rotational speed of the rotating motors and the position of the cutter to cut each of the positive and negative electrodes when the positive and negative electrodes are input.

And, if it is determined that the defective may further comprise the step of separately discharging the electrode assembly manufactured by winding in the core and the electrode assembly determined as good quality. In the step of discharging separately, as well as the discharge of good and defective goods to different locations, and also includes a method of discharging by writing a separate bad marker on the defective goods.

In addition, the present invention may further include a step of visually or audibly alerting the occurrence of the failure when it is determined that the failure. That is, a warning window may be visually displayed on a monitor viewed by a worker or a known method of informing a warning message through a speaker may be notified to a worker of a failure quickly.

In addition, in the method of the present invention, if a difference between the input dose and the monitored dose set in the monitoring step (or after the monitoring step is finished) occurs, the calculated end interval determines the cutting position of the negative electrode or the positive electrode. Determining whether the correction is possible otherwise; And changing the cutting position of one or more of the negative electrode and the positive electrode so that the end interval is corrected to a normal range if correction is possible.

Further, in the present invention, each of the positive electrode and the negative electrode is manufactured by applying a positive electrode active material or a negative electrode active material on both sides of the current collector, the holding portion and the uncoated uncoated portion coated with the positive electrode active material or negative electrode active material is repeated, the And an additional defect determination step of determining a failure by whether or not a mismatch value, which is a distance between the end position of the holding portion applied to one surface and the end position of the holding portion applied to the opposite surface, in each of the positive and negative electrodes is within a predetermined range. .

In addition, the present invention further provides an electrode assembly manufacturing apparatus in which the electrode assembly is manufactured through the method as described above. The manufacturing apparatus according to the present invention, the winding of the positive electrode, the negative electrode, and the separator is wound together by winding the ends of the positive electrode, the negative electrode, the separator; A transfer unit for introducing the electrode into the core by the rotational force of the built-in transfer motor; A cutter disposed between the core and the transfer part to cut the electrode introduced into the core; And calculating an end distance, which is a distance difference between the end position of the cut anode and the end position of the cut cathode, with the rotational speed of the feed motor of the positive electrode and the feed motor of the negative electrode, the cutter position of the positive electrode, and the cutter position of the negative electrode. And a controller for determining a failure based on whether the calculated end interval is within a predetermined range.

And a guide roller for guiding the electrode to be moved while being bent toward the core, and the conveying part is disposed between the guide roller and the core.

The guide roller, the transfer unit, and the cutter are separately installed in the supply lines of the cathode and the anode, respectively, and the cutter is configured to slide between the core and the transfer unit.

Each of the negative electrode and the positive electrode is formed on the surface of the current collector and the sustaining portion coated with the active material and the uncoated non-coated portion of the active material are continuously formed on the upper surface of the current collector. A first vision for sensing an end unit value of the retained portion; And a second vision configured to sense an end unit value of the holding part applied to the opposite surface of the anode or the cathode while the anode or the cathode is injected, wherein the controller analyzes data of the first vision and the second vision. Further determination is made as to whether or not a mismatch occurs, whether or not a mismatch value, which is a distance between the end position of the holding portion applied to one surface of the positive or negative electrode wound at the core and the end position of the holding portion applied to the opposite surface, is within a predetermined range.

The controller may determine whether correction is possible when a difference between the set input amount and the monitored input amount occurs, and control the cutter to generate a length difference between the positive electrode and the negative electrode being wound.

The cathode or anode is configured to pass through the first vision and the second vision before reaching the conveying portion.

In addition, further comprising a third vision for sensing the end unit value of the holding portion applied to the surface of one side or the opposite side of the positive or negative electrode while the positive or negative electrode is injected, the third vision is disposed between the cutter and the core Then, the data derived from the first vision and the second vision and the misalignment size calculated by the controller are further verified. The controller may control a device that visually or audibly alerts the occurrence of a failure when a failure occurs.

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. That is, in the production process of the electrode assembly, it is possible to monitor the occurrence of the defect of the electrode assembly in real time due to misalignment defect (defect due to the end distance, which is the distance difference between the end position of the cut anode and the end position of the cut cathode). Therefore, trend management of the entire production process is possible.

In the present invention, since the misalignment is calculated through the rotational speed of the feed motor and the position of the cutter rotating while feeding the negative and positive electrodes, respectively, while the negative electrode and the positive electrode are wound at the core, defects can be determined with high accuracy. Even if a defect occurs, if the range is correctable, the defect can be corrected to further lower the defective rate of the product.

In the present invention, since the first vision and the second vision are included, the mismatch is a difference between the end positions of the holding parts coated on the upper surface of the electrode (cathode and anode) and the end positions of the holding parts applied on the lower surface. The defects can be additionally monitored and identified, further increasing production efficiency.

In addition, since it further includes a third vision disposed in the vicinity of the core, it is possible to improve the reliability of the defect determination by finally checking the winding state before determining the failure due to misalignment and mismatch.

Figure 1a is a simplified view showing a state in which a jelly roll type electrode assembly is manufactured in a conventional manner.
Figure 1b is a perspective view showing the appearance of the end intervals in the cutting portion of the cathode and the anode.
Figure 2 is a front view showing a simplified view of the manufacturing apparatus according to a preferred embodiment of the present invention.
FIG. 3 is an enlarged view of a portion in which a third vision is installed in FIG. 2 and a state in which mismatch occurs at the top and bottom surfaces of the anode; FIG.
4 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.

According to the present invention, two electrodes (2 [anode], 3 [cathode]) formed on the surface of the current collector and formed on the upper surface of the current collector and the uncoated portion on which the active material is uncoated are continued on each side (see FIG. 3). The present invention relates to an apparatus and a manufacturing method of an electrode assembly, which is wound at the core together with an electrode assembly, and will be described in more detail with reference to the accompanying drawings.

Example 1

The present invention provides an apparatus for producing an electrode assembly as Example 1. As shown in FIG. 2, in this embodiment, the manufacturing apparatus includes a winding core 10, a conveying unit 20, a cutter 60, a guide roller 70 in a supply line of each of the anode 2 and the cathode 3. The first vision 30 and the second vision 40 are disposed.

The core 10 is rotated by receiving a rotational force from a motor or the like, and rotates by a predetermined number of revolutions in the state in which the ends of the anode 2, the cathode 3, and the separator 4 are fixed together. , The cathode 3 and the separator 4 are wound in a jellyroll form.

At this time, the transfer unit 20 has a built-in transfer motor (not shown) is rotated so that the negative electrode (2) or the positive electrode (3) is smoothly supplied while maintaining the appropriate tension while winding in the core 10, the corresponding negative electrode (2) or the anode 3 is slid (injected).

Then, when the input of each electrode (2, 3) by the predetermined length is made, the cutter 60 is slidably between the core 10 and the transfer unit 20 to cut each electrode (2, 3). (Not shown in the drawing, but a separate cutter for cutting the separator by the control unit is also provided).

In the present invention, the transfer unit 20, the cutter 60, the core 10, the first vision 30, the second vision 40, the third vision 80 is electrically connected to communicate and control the operation The controller 50 is provided. The controller 50 may be implemented as a control device built in the manufacturing apparatus or a separate computing device that is separated from the manufacturing apparatus and communicatively connected, and the criteria for determining whether the controller 50 is defective or a misalignment to be described later. And the logic for calculating the mismatch is operated in a pre-input state.

That is, the controller 50 controls the operations of the core 10, the cutter 60, and the transfer unit 20 according to a previously input logic, and the anode 2 and the cathode of the electrode assembly wound from the core 10. The end interval of (3) (refer to FIG. 1B) is computed.

The end intervals of the positive electrode 2 and the negative electrode 3 correspond to the rotational speed of the transfer motor of the positive electrode 2 and the negative electrode 3, the cutter position of the positive electrode 2, and the cutter position of the negative electrode 3. The calculation is performed according to predetermined logic input to the controller based on the information. That is, when the rotation of the winding core 10 is finished, the end gap, which is the distance difference between the end position of the cut anode 2 and the end position of the cut cathode 3, is transmitted through the information transmitted to the controller 50. It may be calculated, and the controller 50 may determine whether the calculated end interval is within a predetermined range.

In addition, the controller 50 determines whether or not correction is possible when a difference between the set input amount and the monitored input amount occurs, and causes a length difference between the positive electrode 2 and the negative electrode 3 to be wound (a supply line of the positive electrode or One or more of the cutters (located in the supply line of the cathode) can be controlled.

In the apparatus of the present invention, the electrode 2 and 3 may further include a guide roller 70 for guiding the electrode 2 and 3 to be bent toward the core 10, and the guide roller 70 may include an electrode. The transfer unit 20 may be disposed at a position before reaching the transfer unit 20 so that the transfer unit 20 is in line with the cutter 60 and the core 10.

On the other hand, as described above, each of the positive electrode 2 and the negative electrode 3 used in the present invention has a structure in which a flat portion is formed at a predetermined distance so that the electrode tab can be processed. That is, as shown in FIG. 3, each of the negative electrode 3 and the positive electrode 2 is formed to continue on each of the upper and lower portions of the holding portion coated with the active material on the surface of the current collector and the uncoated portion uncoated with the active material. However, if the mismatch (see Fig. 3), 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 in the previous manufacturing step of the positive electrode 2 and the negative electrode 3, exceeds the allowable range, There was a possibility of a reverse defect between the positive electrode and the negative electrode (a defect in which either 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).

Accordingly, the apparatus according to the present invention is additionally provided with a first vision 30, a second vision 40, and a third vision 80 so as to detect the occurrence of a failure due to such mismatch.

That is, as shown in FIG. 2, the first vision 30 and the second vision 40 are paired in each of the supply lines of the anode 2 and the cathode 3. In the present invention, the first vision 30 is disposed on each of the upper surface of the negative electrode 3 and the positive electrode 2 while the negative electrode 3 and the positive electrode 2 are introduced, and a holding part applied to the upper surface of the current collector. The end unit value is sensed, and the second vision 40 is disposed opposite the first vision 30 so that each of the cathode 3 and the anode 2 is housed while the cathode 3 and the anode 2 are introduced. The end unit value of the holding part applied to the entire lower surface is sensed.

The control unit 50 analyzes the data transmitted from the first vision 30 and the second vision 40 to analyze the data transmitted on the one side of the anode 2 or cathode 3 wound around the core 10. It is further determined whether or not a defect has occurred by whether or not the mismatch value, which is the distance between the end position and the end position of the holding portion applied to the opposite surface, is within a predetermined range.

The negative electrode 3 or the positive electrode 2 is configured to pass between the first vision 30 and the second vision 40 before reaching each of the transfer parts 20, and in the vicinity of the winding core 10, a third Vision 80 may be further deployed. That is, while the anode 2 or the cathode 3 is being injected, the third vision may be additionally sensed so as to additionally sense the end unit value of the holding part applied to the surface of one side or the opposite side of the anode 2 or the cathode 3. 80 is further disposed between the core 10 and the cutter 60 as shown in FIG. 3.

The third vision 80 additionally verifies defects due to misalignment and data derived from the first vision 30 and the second vision 40. That is, the third vision 80 monitors a situation in which the anode 2 and the cathode 3 are wound around the core 10, and when the cutting is performed by the cutter 60, the cathode 3 and the anode ( You can check once more whether the actual misalignment value between 2) is close to the calculated value. In addition, (optionally) the third vision 80 may be disposed in each of the anode 2 and the cathode 3 so as to optically sense whether each mismatch value is close to the calculated value. .

At this time, in order to increase the accuracy of optical sensing of the third vision 80, the cutting is performed in the cutter 60, and just before the ends of the cathode 3 and the anode 2 are wound on the core 10 (the While the end passes the third vision, the controller 50 may reduce the rotational speed of the core 10 as necessary. In addition, it is also possible to further sense through the third vision 80 only when the misalignment value or mismatch value calculated in order to prevent the production speed decreases abnormally. In addition, if the mismatch value is known from the information obtained through the first vision 30 and the second vision 40, and the end unit value of the holding part (either the upper surface or the lower surface) is known, the opposite side Since it is possible to estimate the position of the end of the holding part, it may also be possible to control the feed motor (embedded in the conveying part) to suppress the defects caused by misalignment.

In addition, the controller 50 may notify the occurrence of a failure by interlocking or controlling a device, such as a speaker or a monitor screen of a worker computer, that visually or acoustically warns of the failure when a failure occurs.

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 60 to a specific position before winding is made, the positive electrode 2 and the negative electrode 3 and the separator The input amount may be set after (4) is fixed to the core (10). However, a key feature of the manufacturing method according to the present invention is that failure by misalignment (and mismatch) is monitored in real time while the electrode assembly is manufactured according to the rotation of the core 10, and the failure is determined.

The present invention is a method of manufacturing an electrode assembly by winding the positive electrode (2), the negative electrode (3), the separator 4 together to produce an electrode assembly, as shown in Figure 3, the positive electrode (2), the negative electrode (3) Setting the dose (length to be wound in the core) of each of the separators 4; Fixing the ends of the positive electrode 2, the negative electrode 3, and the separator 4 to the core 10; Rotating the winding core 10 to wind the positive electrode 2, the negative electrode 3, and the separator 4 together; Monitoring the input state of each of the positive electrode 2 and the negative electrode 3 while the positive electrode 2 and the negative electrode 3 are injected; Cutting each of the anode (2), the cathode (3), and the separator (4); And calculating an end distance, which is a distance difference between the end position of the cut anode 2 and the end position of the cut cathode 3, and determining a misalignment defect by determining whether the calculated end interval is within a predetermined range. Decision step; includes.

Calculation of the end interval in the present invention is to determine the rotational speed of the feed motor rotates when each of the positive electrode (2) and the negative electrode (3) and the position of the cutter 60 for cutting each of the positive electrode (2) and the negative electrode (3) Operated as a variable.

On the other hand, in the method of the present invention, a difference between the input amount set before cutting the cutter 60 and the input amount monitored (calculated with the rotational speeds of the transfer motors and the position of the cutter for cutting each of the positive and negative electrodes) is generated. Then, the calculated end distance can be corrected by changing the cutting position of the negative electrode 3 or the positive electrode 2 so as to compensate or offset the difference based on the monitored input which is the same or relatively closer to the actual dose. The method may further include the step of cutting by changing one or more cutting positions of the negative electrode 3 or the positive electrode 2 such that the end interval is corrected to a normal range if the step of determining and correction is possible.

That is, the present invention compares the difference between the initially set input amount and the monitored input amount during the monitoring step (or after the monitoring step ends). If the difference does not occur or the difference may be neglected (if it is within a predetermined range), the electrodes 2 and 3 and the separator 4 are cut according to the set value.

On the other hand, if a difference greater than a predetermined range occurs, the received information (cutter position of each of the positive and negative poles can be adjusted to eliminate or eliminate the difference by adjusting the cutting position of the cutter 60 or changing the cutting time point. Rotational speed of the feed motor of each of the positive and negative poles, the rotational speed of the core, etc. are determined according to a predetermined logic. If the correction is not possible, the cutter 60 cuts the sheet according to the original setting value, and determines that the cutter is defective. If the correction is possible, the cutting position and / or the cutting point of the cutter 60 are adjusted to offset the difference of the input amount. Cutting is made.

Next, a misalignment value is derived by comparing the doses of the positive electrode 2 and the negative electrode 3 finally inputted, and a failure is determined by whether or not the derived value is within an allowable range. At this time, the misalignment value is further optically measured through the third vision 80 additionally disposed near the core 10 as described above, and the optically measured value is compared with the value derived through calculation. You can verify once again whether this is certain.

On the other hand, each of the positive electrode (2) and the negative electrode (3) implemented in the present invention is manufactured by applying a positive electrode active material or a negative electrode active material on both sides of the current collector, the holding portion and the uncoated uncoated portion coated with the positive electrode active material or negative electrode active material It has a repeating structure. In the present invention, in each of the positive electrode (2) and the negative electrode (3), whether or not the mismatch value which is the distance between the end position of the holding portion applied to one surface and the end position of the holding portion applied to the opposite surface is within a predetermined range Further comprising the additional failure determination step of determining.

Then, when it is determined that the defect is bad, the electrode assembly wound and manufactured in the core 10 is separated from the electrode assembly determined as good quality and discharged. In the step of discharging separately, as well as the discharge of good and defective goods to different locations, and also includes a method of discharging by writing a separate bad marker on the defective goods.

In addition, the present invention may further include a step of visually or audibly alerting the occurrence of the failure when it is determined that the failure. That is, a warning window may be visually displayed on a monitor viewed by a worker or a known method of informing a warning message through a speaker may be notified to a worker of a failure quickly.

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. That is, in the production process of the electrode assembly, it is possible to monitor the occurrence of defects of the electrode assembly due to misalignment defects in real time, thereby enabling trend management throughout the production process.

In the present invention, while the negative electrode 3 and the positive electrode 2 are wound at the core 10, the rotational speed of the feed motor and the position of the cutter 60 are rotated while feeding the negative electrode 3 and the positive electrode 2, respectively. Because misalignment is calculated through, it is possible to determine whether or not defective with high accuracy, and even if a defect occurs, the defect can be corrected as long as it can be corrected, thereby further lowering the defective rate of the product.

In the present invention, since the first vision 30 and the second vision 40 are included, the distance between the end position of the holding part applied to the upper surface of the electrode (cathode and the positive electrode) and the end position of the holding part applied to the lower surface of the electrode is provided. It is possible to further monitor and discriminate defects caused by mismatches, which can make production more efficient.

In addition, since the third vision 80 additionally disposed in the vicinity of the winding core 60, the winding state may be finally confirmed before determining the failure due to misalignment and mismatch, thereby increasing reliability of the failure determination.

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.

2: anode
3: cathode
10: core
20: transfer unit
30: First Vision
40: Second Vision
50: control unit
60: cutter
80: Third Vision

Claims (14)

In the electrode assembly manufacturing method of winding an anode, a cathode, a separator together to produce an electrode assembly,
Setting a dose of each of the positive electrode, the negative electrode, and the separator while being wound;
Fixing the ends of the positive electrode, the negative electrode, and the separator to the core;
Rotating the winding core to wind the positive electrode, the negative electrode, and the separator together;
Monitoring the input state of each of the positive and negative electrodes while the positive and negative electrodes are injected;
Cutting each of the positive electrode, the negative electrode, and the separator; And
Comprising: a defect determination step of calculating the end interval which is the distance difference between the end position of the cut anode and the end position of the cut cathode, and determines the failure whether or not the calculated end interval is within a predetermined range; characterized in that it comprises a; Method for producing an electrode assembly.
The method of claim 1,
The calculation of the end interval is a method of manufacturing an electrode assembly, characterized in that the calculation of the rotational speed of the feed motor and the position of the cutter for cutting each of the positive and negative electrodes rotated when each of the positive and negative electrodes are input.
The method of claim 2,
And discharging the electrode assembly manufactured by winding in the core and separated from the electrode assembly which is judged to be good if it is determined to be defective.
The method of claim 2,
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 a difference between the set input amount and the monitored input amount occurs in the monitoring step, determining whether the calculated end interval is corrected by changing the cutting position of the negative electrode or the positive electrode; And
If the correction is possible to change the cutting position of one or more of the negative electrode or the positive electrode so that the end interval is corrected to the normal range; cutting the electrode assembly manufacturing method comprising a.
The method of claim 5,
Each of the positive electrode and the negative electrode has a structure in which a positive electrode active material or a negative electrode active material is coated on both sides of a current collector, and a holding portion and an uncoated uncoated portion coated with a positive electrode active material or a negative electrode active material are repeated.
An additional defect determination step of determining whether or not a mismatch value, which is a distance between an end position of the holding portion applied to one surface and an end position of the holding portion applied to the opposite surface, is within a predetermined range in each of the positive and negative electrodes; Method for producing an electrode assembly, characterized in that it comprises a.
In the electrode assembly manufacturing apparatus for winding an anode, a cathode, a separator together 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 cutter disposed between the core and the transfer part to cut the electrode introduced into the core; And
Calculating the end distance, which is the distance difference between the end position of the anode cut and the end position of the cut cathode, the rotational speed of the feed motor of the positive electrode and the feed motor of the negative electrode, the cutter position of the positive electrode and the cutter position of the negative electrode, And a control unit for determining a defect in whether the calculated end interval is within a predetermined range.
The method of claim 7, wherein
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 8,
The guide roller, the transfer unit, 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 8,
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 7, wherein
Each of the negative electrode and the positive electrode is formed such that 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 continued from each other.
A first vision for sensing an end unit value of a holding part applied to one surface of the positive electrode or the negative electrode while the positive electrode or the negative electrode is injected; And a second vision for sensing an end unit value of the holding part applied to the surface of the opposite side of the positive electrode or the negative electrode while the positive electrode or the negative electrode is injected.
The control unit analyzes the data of the first vision and the second vision, the mismatch value is a distance between the end position of the holding portion applied to one surface of the positive or negative electrode wound at the core and the end position of the holding portion applied to the opposite surface An apparatus for manufacturing an electrode assembly, characterized in that additionally determine whether or not the failure occurs within a predetermined range.
The method of claim 11,
The cathode or the anode is an electrode assembly manufacturing apparatus, characterized in that configured to pass through the first vision and the second vision before reaching the conveyance.
The method of claim 12,
Further comprising a third vision for sensing the end unit value of the holding portion applied to the surface of one side or the opposite side of the positive or negative electrode while the positive or negative electrode is injected,
And the third vision is disposed between the cutter and the core.
The method according to any one of claims 8 to 13,
The control unit is an electrode assembly manufacturing apparatus, characterized in that for controlling a device for visually or auditory warning of the occurrence of a failure.

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