KR102616138B1 - Apparatus and method for marking not good cell - Google Patents

Abstract

The present invention relates to an apparatus and method for detecting a defective electrode assembly and marking the electrode assembly in which the defect has been detected, comprising a moving member for moving a plurality of electrode assemblies in a specific direction, and a plurality of moving electrodes. A detection unit that identifies the tabs of each integrated body and acquires an image of the electrode assembly corresponding to the identified tab, a marking unit including an air spray unit formed to direct the area through which the tabs pass, and the Based on the image, it is determined whether the electrode assembly is defective, and when the tab of at least one specific electrode assembly determined to be defective passes through the area toward which the air injection unit is directed, compressed air is sprayed to determine whether the at least one electrode assembly is defective. It is characterized in that it includes a control unit that controls the air injection unit so that at least a portion of the specific electrode assembly tab is folded in one direction.

Description

Bad cell marking device and marking method {APPARATUS AND METHOD FOR MARKING NOT GOOD CELL}

The present invention relates to an inspection device for an electrode assembly, and more specifically, to an apparatus and method for detecting a defective electrode assembly and marking the electrode assembly in which the defect has been detected.

Typical portable electronic devices have a built-in battery pack containing batteries that output a certain level of voltage and can operate for a certain period of time without a separate power input. And these battery packs employ secondary batteries to enable charging and discharging, and lithium secondary batteries with high operating voltage and high energy density per unit weight are mainly used as these secondary batteries.

These lithium secondary batteries can be formed by applying a slurry containing an electrode active material to the surface of an electrode assembly usually made of metal foil or metal mesh. In this way, when coating the electrode active material on the electrode assembly, it is rolled from an uncoiler to a roll type. The electrode assembly, which is wound and supplied to a certain width, is unwound in a flat shape, passes through a dryer located at the bottom of the slit die, and is wound again on a winder. Here, the slit die receives slurry from the slurry tank and evenly spreads the slurry through a long die formed in the shape of a slit. As the electrode assembly passes under the slit die at a constant speed by a belt pulley, the electrode assembly is sprayed on the surface of the electrode assembly. An active material layer of a certain thickness can be formed by the slurry.

However, in the process of applying the slurry to the electrode assembly, defects may occur due to foreign substances applied together or bubbles generated when the slurry is applied. In addition, when a battery is produced using an electrode assembly with defects in the electrode active material layer, defective electrode assembly must be removed because it may cause battery defects.

Meanwhile, in order to remove a defective electrode assembly, the part of the defective assembly must be marked. To do this, the user must check whether an NG (Not Good) tag indicating the occurrence of the defect is attached. It was necessary to detect and mark the area where the defect occurred by attaching a preset marking tape to a portion of the electrode assembly to which the NG tag was attached.

In addition, the typical marking method in which the user directly marks the defective area using a marking tape has the problem that the movement of the electrode assembly must be stopped for a certain period of time while the user performs the marking process. Accordingly, there is a problem that the operation rate is reduced due to the time required to mark the defective area, and the production yield of the secondary battery is reduced.

The present invention aims to solve the above-described problems and other problems, and provides a defective cell marking device and marking method that can mark an area of a defective electrode assembly without stopping the movement of the electrode assembly. It is provided.

According to one aspect of the present invention to achieve the above or other objects, a defective cell marking device according to an embodiment of the present invention includes a moving member that moves a plurality of electrode assemblies in a specific direction, and a plurality of moving electrodes. A detection unit that identifies the tabs of each integrated body and acquires an image of the electrode assembly corresponding to the identified tab, a marking unit including an air spray unit formed to direct the area through which the tabs pass, and the Based on the image, it is determined whether the electrode assembly is defective, and when the tab of at least one specific electrode assembly determined to be defective passes through the area toward which the air injection unit is directed, compressed air is sprayed to determine whether the at least one electrode assembly is defective. It is characterized in that it includes a control unit that controls the air injection unit so that at least a portion of the specific electrode assembly tab is folded in one direction.

In one embodiment, the control unit detects whether an NG (Not Good) tag is attached from the acquired image, and determines whether the electrode assembly is defective depending on whether the NG tag is attached.

In one embodiment, when the specific electrode assembly is determined to be defective due to an NG tag being attached, the control unit determines that all of a plurality of other electrode assemblies adjacent to the specific electrode assembly are defective. It is characterized by:

In one embodiment, the control unit determines whether there is a defect according to the appearance of the electrode assembly from the acquired image, and the defect according to the appearance of the electrode assembly is determined by the width of the tab and the pitch of the tab. , the defect is characterized by at least one of the tilt state of the tab, the length of the tab, or the active material layer coating state (T coating, B coating) of the cell.

In one embodiment, the control unit sets the injection timing including the opening and closing time of the injection port of the air injection unit by reflecting the distance between the detection unit and the air injection unit and the moving speed of the plurality of electrode assemblies, and the set The air injection unit is controlled according to the injection timing to control the timing and injection time at which compressed air is injected through the injection hole, and the injection timing is determined when the defect is determined by the NG tag and the electrode assembly. In the case where it is determined according to its appearance, it is characterized in that each is set to a different number.

In one embodiment, the distance between the detection unit and the air injection unit is at least three times the horizontal width of the electrode assembly.

In one embodiment, the marking unit includes a plurality of air injection units, and the first air injection unit of the plurality of air injection units is arranged to be oriented in a specific direction in which the tab of the specific electrode assembly will be folded, At least one other air injection unit excluding the first air injection unit is disposed to face the upper surface of the specific folded electrode assembly tab.

In one embodiment, between the marking unit and the detection unit, a tab guide including an upper guide that prevents the tabs from being folded toward the top, and a lower guide that prevents the tabs from being folded toward the bottom. It is characterized in that it further includes.

In one embodiment, the upper guide and the lower guide are formed so that the gap between the upper guide and the lower guide gradually decreases as it approaches the marking part, and after a point, a minimum value determined according to the thickness of the tabs is formed. It is characterized in that it is formed to maintain the gap.

In one embodiment, the NG tag is attached to a preset position of the holding portion coated with the electrode active material.

In one embodiment, the detection unit includes a tap sensor that identifies each tab of a plurality of moving electrode assemblies, and an image sensor that is activated when a tab is identified as a result of the identification of the tap sensor and acquires an image of the electrode assembly. It is characterized by including.

In one embodiment, the control unit activates the image sensor by controlling the detection unit to acquire an image of the electrode assembly if the next tap is not detected for a preset monitoring time after the tap is detected by the tap sensor. It is characterized by

In one embodiment, the monitoring time (tmonitoring) is determined according to the following equation according to the tab pitch (Tab pitch), the maximum speed at which the electrode assembly moves (max speed), and the preset setting range (x) It is characterized by being

[Equation]

According to one aspect of the present invention in order to achieve the above or other objects, the defective cell marking method according to an embodiment of the present invention identifies tabs of each of a plurality of electrode assemblies moving in a specific direction, and selects the identified tab. Counting, acquiring an image of the electrode assembly corresponding to the identified tab, determining whether the electrode assembly is defective based on the acquired image, and determining whether the electrode assembly is defective or not, between the detection unit and the air injection unit. Setting at least one injection timing including an opening/closing time of the injection hole of the air injection unit according to the type of defect determined from the electrode assembly, reflecting the distance and the moving speed of the plurality of electrode assemblies, and and controlling the air injection unit according to the at least one injection timing so that the tabs of at least one electrode assembly corresponding to the determined defect are folded in a specific direction.

In one embodiment, the step of setting the at least one injection timing may include, when a defect in the electrode assembly corresponding to the acquired image is detected according to the attachment of an NG (Not Good) tag, the NG tag is attached. A plurality of injections corresponding to the plurality of electrode assembly tabs so that the tabs of the electrode assembly and the other electrode assembly on the left and right of the electrode assembly to which the NG tag is attached can be folded in a specific direction by the sprayed compressed air. It is characterized as a step of setting timing.

In one embodiment, the step of setting the at least one injection timing may be performed when a defect in the electrode assembly corresponding to the acquired image is detected according to the appearance of the electrode assembly detected from the acquired image. This is characterized in that it is a step of setting one injection timing corresponding to the electrode assembly tab in which the defect is detected so that any one of the detected electrode assembly tabs can be folded in a specific direction by the injected compressed air.

According to at least one of the embodiments of the present invention, the present invention detects whether an NG tag indicating the occurrence of a defect is attached through a detection unit, and detects an area of the electrode assembly to which the NG tag is attached according to the detection result through compressed air. One area of the electrode assembly to which the NG tag is attached is marked by folding the electrode area in a specific direction, thereby enabling marking of the defective area while the electrode assembly maintains movement. Therefore, there is an effect that the operation rate of the production facility can be increased and the production yield of secondary batteries can be increased.

Figure 1 is a block diagram for explaining the components that make up a defective cell marking device according to an embodiment of the present invention.
Figure 2 is an exemplary diagram to explain an example in which a defective cell is detected and marked through a defective cell marking device according to an embodiment of the present invention.
Figure 3 is an example diagram showing an example of marking a defective cell detected through an image using compressed air in a defective cell marking device according to an embodiment of the present invention.
Figure 4 is an exemplary diagram showing various embodiments that can be implemented in a defective cell marking device according to an embodiment of the present invention.
Figure 5 is a flowchart showing an operation process for marking defective cells using compressed air in the defective cell marking device according to an embodiment of the present invention.
Figure 6 is a flowchart showing an operation process for setting the injection timing of compressed air differently depending on the detected defect in the defective cell marking device according to an embodiment of the present invention.
FIGS. 7 and 8 are diagrams illustrating an example of marking of different cells according to injection timings set differently in FIG. 6 .
Figure 9 is an exemplary diagram to explain an example in which an NG tag is attached to a specific location according to an embodiment of the present invention.
Figure 10 is a block diagram showing in more detail the configuration of a marking unit in the defective cell marking device according to an embodiment of the present invention.
Figure 11 is a conceptual diagram illustrating the concept of detecting a defective cell through a time count in a defective cell marking device according to an embodiment of the present invention.

It should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. Additionally, as used herein, singular expressions include plural expressions, unless the context clearly dictates otherwise. The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of writing the specification, and do not have distinct meanings or roles in themselves.

As used herein, “consists of.” or “including.” Terms such as these should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may not be included, or additional components or steps may be included. It should be interpreted to include more.

Additionally, when describing the technology disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the technology disclosed in this specification, the detailed description will be omitted.

In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes. In addition, each embodiment described below, as well as a combination of embodiments, are changes, equivalents, or substitutes included in the spirit and technical scope of the present invention, and of course, may fall within the spirit and technical scope of the present invention. .

Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings.

First, as described above, slurry may be applied to the electrode assembly to form an electrode active layer. Here, the electrode active layer may be applied only to a portion of the electrode assembly, and accordingly, the electrode assembly has a first region where the electrode active layer is formed and a second region, which is also called an uncoated region or uncoated region because the electrode active layer is not formed. It can be divided into areas.

Meanwhile, the electrode assembly may include a slitting line and may be divided into a plurality of pieces along the slitting line. That is, one electrode assembly can be divided into a plurality of electrode aggregates by the slitting line. Here, each electrode assembly divided by the slitting line may include a first region coated with an electrode active material and a second region not coated with the electrode active material. For convenience of description below, the electrode assemblies divided by the slitting line will be regarded as separate electrode assemblies.

Here, a portion of the second area that is not coated with the electrode active material may be removed through a notching process. And a portion of the second area remaining after notching may form an electrode area of a secondary battery to be formed later. On the other hand, the first area coated with the electrode active material may become a cell area of a secondary battery to be formed later. Therefore, in the following description, the first area will be referred to as a cell, and the second area that forms the electrode of the secondary battery will be referred to as a tab.

Meanwhile, since each electrode assembly includes a first region and a second region, it may include a cell corresponding to the first region and a tab corresponding to a portion of the second region. And each cell and tab can correspond to each other, and the cell corresponding to the tab can be identified through the tab. Accordingly, in the present invention, when a bad cell is detected as a result of detecting a bad (NG, Not Good) cell, the cell can be marked as a bad cell by changing the shape of the tab corresponding to the cell.

Hereinafter, the configuration and operation of the present invention described above will be described in more detail with reference to a number of drawings related to the present invention.

Figure 1 is a block diagram for explaining the components that make up the defective cell marking device 10 according to an embodiment of the present invention.

Referring to FIG. 1, the defective cell marking device 10 according to an embodiment of the present invention includes a control unit 100, a detection unit 110 and a marking unit 120 connected to the control unit 100. It can be configured. The components shown in FIG. 1 are not essential, so the bad cell marking device 10 described herein may have more or fewer components than those listed above.

More specifically, the detection unit 110 can identify each of a plurality of electrode assemblies moved by a belt pulley (not shown) and detect whether the identified electrode assemblies are defective cells. To this end, the detection unit 110 may include a tap sensor 111 that identifies a tab from each of a plurality of electrode assemblies, and may include an image sensor 112 that acquires an image of at least one electrode assemblies. .

Here, the image sensor 112 may be linked with the tap sensor 111. That is, the image sensor 112 is activated when a tab is identified in the tab sensor 111 and can acquire an image of at least one electrode assembly including the identified tab. That is, identification of the tab may serve as a trigger for image acquisition by the image sensor 112. And the detection unit 110 can detect whether the electrode assembly is defective through the acquired image.

As an example, the detection unit 110 may detect defects according to the appearance of the electrode assembly based on the acquired image. Here, defects according to appearance may include the width of the tab, the pitch of the tab, the tilt state of the tab, the length of the tab, or the active material layer coating state (T coating, B coating) of the cell. And when it is determined whether there is a defect through the image, a signal indicating that the cell corresponding to the currently identified tab is a defective cell can be transmitted to the control unit 100.

Meanwhile, the detection unit 110 may further include an NG tag sensor 113 capable of identifying an NG (Not Good) tag. Here, the NG tag is attached through a process of determining whether the electrode assembly is defective, which was performed prior to the present invention, and can be attached to the electrode assembly in a state before being divided into a plurality of electrode assembly by the slitting line. Therefore, with the NG tag attached, the electrode assembly can be divided into a plurality of electrode assemblies along the slitting line, and the NG tag can be attached to a specific electrode assembly on which a defect is detected among the plurality of divided electrode assemblies. .

Meanwhile, the NG tag may be a tag that emits a preset proximity wireless signal. Alternatively, it may be a tag formed to reflect light of a specific wavelength when light of a preset wavelength is irradiated. Therefore, the NG tag sensor 113 is formed as a sensor that detects a proximity wireless signal detected in the NG tag, or irradiates light of the preset wavelength and detects light of the specific wavelength reflected according to the irradiated light. It may be a sensor configured to do so.

Alternatively, the NG tag may be a tag with a preset shape. In this case, the NG tag sensor 113 may be a sensor that acquires an image, similar to the image sensor 112, and detects the NG tag depending on whether a preset shape of the NG tag is detected from the acquired image. It may be a sensor to be formed. In this case, the NG tag sensor 113 may be the image sensor 112. That is, of course, the image sensor 112 can also perform the role of the NG tag sensor 113 by identifying the NG tag from the acquired image.

And when an NG tag is detected from the NG tag sensor 113, the detection unit 110 may transmit a signal indicating that the cell corresponding to the currently identified tab is a defective cell to the control unit 100.

Additionally, the marking unit 120 may change the shape of a tab of a specific electrode assembly detected as a defective cell under the control of the control unit 100. To this end, the marking unit 120 may include an air injection unit 121 configured to spray air having a preset pressure.

In addition, the air injection unit 121 may transition from an on state in which it sprays compressed air under the control of the control unit 100 to an off state in which air injection is completed. That is, the control unit 100 controls to inject compressed air only during the specified injection timing (on time, off time), so that the tab of the designated electrode assembly, that is, the electrode assembly detected as a defective cell, is directed to the point where the injection hole is directed. It can be configured to spray compressed air only when passing through.

Meanwhile, the injection hole through which compressed air is sprayed from the air injection unit 121 may be formed to point toward the tab of the electrode assembly that moves at a constant speed by the belt pulley. For example, the injection port may be formed to point vertically downward, and the tabs of the electrode assembly moving by a belt pulley may be formed to pass through the point at which the injection port is directed and be wound back onto the winder.

Additionally, the cell region of the electrode assembly moving by the belt pulley may be supported by the support, but the tab region may be formed so as not to be supported by the support. Accordingly, when compressed air is sprayed from the air injection unit 121, at least a portion of the tab passing through the point where the injection hole is directed may be folded in the direction in which the compressed air is sprayed.

Additionally, the marking unit 120 may include a plurality of air injection units, and each air injection unit may be independently controlled by the control unit 100.

Meanwhile, the control unit 100 controls other connected components and can control the overall operation of the defective cell marking device 10 according to an embodiment of the present invention.

The control unit 100 may receive a result of detecting a defective cell from the detection unit 110 . Then, the injection timing at which the compressed air will be sprayed from the marking unit 120 can be determined based on the tab corresponding to the detected defective cell. Here, the injection timing is the time to inject the compressed air, that is, the time to turn on the air injection unit 121, and the time to end injection of the compressed air, that is, the time to turn off the air injection unit 121. Can include point of view.

And the control unit 100 may control the air injection unit 121 to spray compressed air and end compressed air injection according to the determined injection timing. Therefore, only the tabs of the electrode assembly detected as a defective cell may be folded in a specific direction at least in part according to the compressed air sprayed from the air spray unit 121, and accordingly, the electrode assembly detected as a defective cell may be folded with other electrode assemblies. Can be marked distinctly.

FIG. 2 is an exemplary diagram illustrating an example in which a defective cell is detected and marked using the defective cell marking device 10 according to an embodiment of the present invention.

First, referring to (a) of FIG. 2, FIG. 2 (a) shows an example in which the NG tag 240 is attached to the electrode assembly before being divided into a plurality of parts by a slitting line. In this case, a portion of the electrode assembly (201, first region, cell) may be coated with the active material layer, and the remaining portion (230, second region, uncoated region) may not be coated with the active material layer.

In this state, the electrode assembly can be moved at a certain speed in a specific direction by the belt pulley, and when it reaches the area provided with the notching portion 250, the electrode assembly is integrated through the notching process performed by the notching portion 250. The body can be divided into multiple bodies. And by removing at least a portion of each of the second regions of each divided electrode assembly, tabs 210 corresponding to the cells 200 of each divided electrode assembly can be formed.

Meanwhile, the detection unit 110 can detect the tab of each electrode assembly through the tap sensor 111. And by driving the image sensor 112 in conjunction with the detection of the tab, an image of the electrode assembly corresponding to the detected tab can be obtained. And based on the detected image, it is possible to detect whether the electrode assembly corresponding to the image is defective. And the detection unit 110 may transmit a signal indicating that a defective cell has been detected to the control unit 100 according to the defect detection result.

In addition, when an NG tag is detected by the NG tag sensor 113 or the image sensor 112, the detection unit 110 may determine that the electrode assembly corresponding to the currently detected tab is defective. Accordingly, when an NG tag is detected, the detection unit 110 may transmit a signal indicating that a defective cell has been detected to the control unit 100.

Meanwhile, when a signal notifying the detection of a defective cell is received from the detection unit 110, the control unit 100 sends compressed air to the air spray unit 121 of the marking unit 120 according to the position of the electrode assembly corresponding to the detected defective cell. The injection timing to inject can be calculated.

Figure 2(b) shows an example in which the injection timing is set in this way.

Referring to (b) of FIG. 2 , an example is shown where the air injection unit 121 turns on after a certain period of time elapses after the tab is counted, sprays compressed air, and then turns off again. This is due to the distance between the air injection unit 121 and the detection unit 110 and the moving speed of the electrode assembly, where the detection unit 110 is located at a point in the opposite direction to the direction in which the electrode assembly moves than the air injection unit 121. This is because it takes a certain amount of time for the electrode assembly corresponding to the detected defective cell to move to the position where the injection port of the air injection unit 121 is directed.

Therefore, when a defective cell is detected, the control unit 100 reflects the distance between the air injection unit 121 and the detection unit 110 and the moving speed of the electrode assembly, and tabs the electrode assembly corresponding to the defective cell. The time required for the injection port of the air injection unit 121 to move to the directed position is calculated, and the on and off time of the air injection unit 121, that is, the injection timing, is set according to the calculated time, thereby detecting a defective cell. The tabs of the electrode assembly are at least partially folded by the sprayed compressed air.

Here, the constant time may be calculated differently depending on the distance between the air injection unit 121 and the detection unit 110.

For example, when the distance between the air injection unit 121 and the detection unit 110 is the first distance, the control unit 100 calculates the injection timing so that the air injection unit 121 sprays compressed air after the first time. can do. On the other hand, when the distance between the air injection unit 121 and the detection unit 110 is shorter than the first distance, the control unit 100 causes the air injection unit 121 to supply compressed air after a second time shorter than the first time. The injection timing can be calculated to inject.

Meanwhile, the area or pitch of the cell or tab of each electrode assembly may vary depending on the size of the model of the secondary incisor to be created. Therefore, depending on the size of the secondary battery model to be created, the direction of the injection port of the air injection unit 121 may need to be changed.

Therefore, when an operation for marking a defective cell is performed, the control unit 100 first changes the position of the air injection unit 121 to determine the model size of the secondary battery to be created (cell width, tab width, tab pitch, etc. ), the position of the injection port of the air injection unit 121 can be changed so that it is directed to a point through which the tabs pass. In this case, the control unit 100 can determine the position at which the injection hole of the air injection unit 121 is oriented between tabs, opposite to the direction in which the electrode assembly moves so that the time for compressed air to be sprayed can be minimized. The position of the air injection unit 121 can be determined adjacent to the tab located in the direction.

Figure 3 is an example diagram showing an example of marking a defective cell detected through an image using compressed air in a defective cell marking device according to an embodiment of the present invention.

First, referring to (a) of FIG. 3, FIG. 3 (a) shows an example in which an image of at least one electrode assembly is acquired by the image sensor 112, and injection is performed according to the result of detecting a defective cell. An example in which at least a portion of the tab 310 of a specific electrode assembly 311 detected as a defective cell by compressed air is folded is shown using a perspective view.

Meanwhile, Figure 3(b) shows through a cross-sectional view a case where a portion of the tab is folded by injected compressed air.

Referring to Figure 3 (b), an example is shown in which the injection port of the air injection unit 121 is formed to point vertically downward, and the tab 310 of the electrode assembly 311 is oriented vertically downward. This shows an example in which the electrode assembly 311 moves in one direction while crossing the direction.

At this time, as shown in (b) of FIG. 3, only the cells of the electrode assembly 311 can be supported by the support 350. Therefore, since the tab 310 of the electrode assembly 311 is not supported by the support 350, when the tab 310 passes the injection port of the air injection unit 121 in a vertically downward direction, the air injection unit ( When compressed air is sprayed from 121), at least a portion of the tab 310 may be folded according to the direction in which the compressed air is sprayed, as shown in (b) of FIG. 3. And as the tab 310 is folded in this way, the electrode assembly 311 detected as a defective cell can be marked to distinguish it from other electrode assemblies that are not defective.

Meanwhile, as shown in (b) of FIG. 3, the tab 310 of the electrode assembly 311 is not supported by the support 350, so of course, folding may occur due to influences other than compressed air. . In this case, if folding of the tab occurs, there is a risk that the corresponding electrode assembly will be treated in the same manner as the electrode assembly determined to be a defective cell marked according to the folding of the tab, even though it has not been detected as a defective cell. Therefore, the present invention further includes a tab guide 400 that prevents the tabs from being folded, as shown in (a) of FIG. 4, to prevent the tabs from being folded due to influences other than compressed air. can do.

Referring to (a) of FIG. 4, the tab guide 400 according to an embodiment of the present invention includes an upper guide 401 that prevents the tabs from being folded toward the top, and a top guide 401 that prevents the tabs from being folded toward the bottom. It may be formed including a lower guide 402 that can prevent.

Here, the top guide 401 may be formed to spread toward the top to prevent the tabs from being folded toward the top, as described above. On the other hand, the bottom guide 402 may be formed to spread toward the bottom to prevent the tabs from being folded toward the bottom, as described above.

Therefore, as shown in (a) of FIG. 4, the upper guide 401 and the lower guide 402 are widened in the front part of the tab guide 400, and the upper guide 401 and the lower guide 402 are gradually opened. ) can be formed to maintain the minimum gap at one point as the gap between them decreases.

Here, the minimum gap between the upper guide 401 and the lower guide 402 may be determined depending on the thickness of the tab moving along the tab guide. For example, the gap between the upper guide 401 and the lower guide 402 may be larger than the thickness of the tabs so that the tabs can move smoothly along the tab guide 400. Therefore, even if the tab is bent to a certain extent toward the top or bottom, when it reaches the area of the tab guide 400 where the minimum gap is maintained while being guided along the top guide 401 or the bottom guide 402, the bent portion of the tab This can unfold. Therefore, even if part of the tab is bent, the bent part of the tab can be straightened by the tab guide 400, and the bent part can be moved to the winder by passing through the position where the nozzle of the air blower 121 is directed in the straightened state. It can be.

Meanwhile, the electrode assemblies that have passed through the tab guide 400 may enter the guide roll 410 through the folding guide 400. Therefore, when at least a portion of the tab is folded due to compressed air sprayed from the air spray unit 121, the folded state can be fixed through the folding guide 400. In addition, the guide roll 410 can prevent the planar electrode assemblies from being separated or bent, and when at least a portion of the tab is folded, the folded portion can be compressed by the guide roll 410.

Meanwhile, in (b) of FIG. 3 described above, only an example of the case where there is one air injection unit 121 has been described, but of course, unlike this, the marking unit 120 may be provided with a plurality of air injection units. Figure 4(b) shows an example of this case.

Referring to (b) of FIG. 4, when the marking unit 120 includes a plurality of air injection units, the first air injection unit 121a may be arranged to face a specific direction in which the tab 310 will be folded. In addition, at least one other air injection unit (121b, second injection unit) excluding the first air injection unit (121a) may be arranged to face the upper surface of the folded tab.

As an example, referring to (b) of FIG. 4, when the first air injection unit 121a sprays compressed air in a vertical downward direction in the defective cell marking device 10 according to an embodiment of the present invention, the sprayed air Depending on the direction of the air, the tab 310 may be folded vertically downward.

Meanwhile, when the tab 310 is folded like this, as shown in (b) of FIG. 4, the upper surface of the folded tab 310 is oriented to the left according to the folding. Accordingly, the second air injection unit 121b may be formed with an injection hole directed toward the upper surface of the folded tab 310 so that it can spray air on the upper surface of the folded tab 310. Accordingly, the second air injection unit 121b can spray air in the right direction, and the tab 310 can be folded at a larger angle due to the compressed air sprayed from the second air injection unit 121b. Therefore, it can be more clearly distinguished from other tabs that are not collapsed.

Figure 5 is a flowchart showing an operation process for marking defective cells using compressed air in the defective cell marking device 10 according to an embodiment of the present invention.

Referring to FIG. 5, a plurality of electrode assemblies are coated with an electrode active material on one side, include an uncoated portion not coated with the electrode active material, and each tab is formed through a division and notching process by a slitting line, and is a belt. It can be moved by a pulley and enter a region of interest (ROI) formed in the defective cell marking device 10 according to an embodiment of the present invention. Then, the defective cell marking device 10 according to an embodiment of the present invention can detect a tab from at least one electrode assembly that has entered the region of interest. And the detected taps can be counted (S500).

Here, the area of interest may mean a detection area of a sensor in the detection unit 110 of the defective cell marking device 10 according to an embodiment of the present invention. In other words, it may mean an area where the tap sensor 111 can detect a tap and an area where an image can be acquired by the image sensor 112. For example, in FIG. 2 , the area 300 where an image is acquired by the image sensor 112 may be the area of interest.

Meanwhile, the detector 110 may control the image sensor 112 according to the tap detection result in step S500. In more detail, when a tab is detected, the detection unit 110 may drive the image sensor 112 to obtain an image of at least one electrode assembly including an electrode assembly corresponding to the detected tab (S502). .

Meanwhile, when an image of the electrode assembly is acquired, the detection unit 110 may read the acquired image and detect whether the electrode assembly corresponding to the detected tab is defective. As an example, the detection unit 110 detects the width of the tab, the pitch of the tab, the tilt state of the tab, and the length of the tab detected from the acquired image, and detects the width, pitch, tilt state, or Based on the length, it can be detected whether the electrode assembly including the corresponding tab is defective. Alternatively, it is possible to detect whether the coating state is poor by reading the active material layer coating state (T coating, B coating) from the cell area of the electrode assembly. Additionally, when an electrode assembly with a poor tab or coating condition is detected, the detected electrode assembly can be detected as a defective cell.

Alternatively, the detection unit 110 may detect the electrode assembly to which the NG tag is attached through the acquired image or the detection result of the NG tag sensor 113. Then, the detection unit 110 can detect the electrode assembly with the NG tag attached as a defective cell (S504).

Meanwhile, if a defective cell is detected by the detection unit 110 in step S504, the detection unit 110 may transmit the result of detecting the defective cell to the control unit 100. Then, the control unit 100 can set at least one injection timing for compressed air to be sprayed from the air injection unit 121 according to the defective cell detection result (S506). To this end, the control unit 100 reflects the distance between the area of interest of the detection unit 110 and the position at which the jet orifice of the air jet 121 is aimed and the tab position of each electrode assembly to determine the on-time of the air jet 121. and off time can be calculated. And the calculated on time and off time can be set as the injection timing (S506).

Meanwhile, the distance between the area of interest of the detection unit 110 and the position at which the injection port of the air injection unit 121 is directed and the tab position of each electrode assembly may be different depending on the model size of the secondary battery to be produced. For example, if the width of the cell area is different, the position of the tab may vary, and the number of electrode assemblies that can be included within the distance between the area of interest of the detection unit 110 and the injection nozzle may also vary.

Therefore, step S506 may further include a process of moving the position of the air injection unit 121 according to the model size of the secondary battery to be produced so that the compressed air can be sprayed at a more accurate location.

Meanwhile, in step S505, the control unit 100 may set a different number of injection timings depending on the cause of the defective cell detection, that is, the type of defective cell detection.

For example, if the cause of a defective cell being detected is an NG tag attached to an electrode assembly, the control unit 100 detects defects not only in the electrode assembly to which the NG tag is attached but also in adjacent electrode assemblies in order to ensure the stability of the battery to be produced. It can be determined that there is a possibility that it is a cell. Accordingly, the control unit 100 determines not only the specific electrode assembly detected as a defective cell, but also the electrode assemblies adjacent to the left and right of the specific electrode assembly as defective cells, and determines the specific electrode assembly and the electrodes adjacent to the left and right of the specific electrode assembly as defective cells. Multiple injection timings for marking the tabs of the aggregates can be set.

On the other hand, if the cause of the defective cell detection is an abnormality in the tab or an abnormal coating condition of the cell detected through the acquired image, the control unit 100 may determine that a specific electrode assembly is defective. Accordingly, the control unit 100 can set one injection timing for marking the tab of a specific electrode assembly detected as a defective cell.

In this way, the defective cell marking device 10 according to an embodiment of the present invention can set one or more injection timings depending on the detection type of the defective cell. The process of step S506, in which different numbers of injection timings are set depending on the detection type of the defective cell, will be examined in more detail with reference to FIGS. 6, 7, and 8 below.

Meanwhile, if at least one injection timing is set in step S506, the control unit 100 can control the air injection unit 121 according to the set injection timing (S508). That is, the control unit 100 may control the on and off of the air injection unit 121 according to the set at least one injection timing so that at least one tab is folded in a specific direction. Accordingly, at least one tab can be folded by compressed air sprayed from the air spray unit 121 and can be distinguished from other tabs.

Meanwhile, FIG. 6 is a flowchart illustrating in more detail step S506 of FIG. 5 in which the injection timing of compressed air is set according to a detected defect in the defective cell marking device 10 according to an embodiment of the present invention. 7 and 8 are exemplary diagrams showing an example of marking of different cells according to injection timings set differently in FIG. 6.

First, referring to FIG. 6, the control unit 100 may first determine whether a defective cell has been detected in step S504 of FIG. 5 (S600). And, if no defective cells are detected as a result of the determination in step S600, for example, if no defective cell detection results are received from the detection unit 110, the control unit 100 may end without setting the injection timing. In this case, since the injection timing is not set, the air injection unit 121 may be maintained in an off state.

On the other hand, if a defective cell is detected as a result of the determination in step S600, the control unit 100 can distinguish the detection type of the defective cell (S602). For example, the control unit 100 may distinguish whether the currently detected defective cell is due to detection of an NG tag or a result of reading an acquired image. And the injection timing can be set differently depending on the classification result.

First, if the currently detected defective cell is due to an NG tag attached to the electrode assembly, the control unit 100 sets the injection timing for marking both the electrode assembly to which the NG tag is attached and the adjacent left and right electrode assembly. (S604).

Therefore, the control unit 100 can set a plurality of injection timings, and according to the plurality of injection timings set, the air injection unit 121 transitions from the off state (initial state) to the on state, and after a certain time has elapsed The process of transitioning the operating state back to the off state can be performed multiple times. And accordingly, compressed air from the air injection unit 121 may be sprayed multiple times.

FIG. 7 is an example diagram illustrating an example in which, when an electrode assembly is detected as a defective cell due to attachment of an NG tag, a plurality of injection timings are set, and a plurality of tabs are marked according to the plurality of injection timings set.

First, referring to (a) of FIG. 7, the detection unit 110 of the defective cell marking device 10 according to an embodiment of the present invention detects the device based on the detection result of the NG tag sensor 113 or the image sensor 112. The NG tag attached to the electrode assembly can be detected. In this case, the region of interest 700 of the detection unit 110 may be formed wide to include a plurality of electrode assemblies, and when the NG tag 240 is detected within the region of interest 700, the attachment location of the NG tag At least one electrode assembly corresponding to can be detected as a defective cell.

In this case, as described in FIG. 6, the control unit 100 detects defects not only in the electrode assembly to which the NG tag is attached, but also in other electrode assemblies adjacent to the left and right of the electrode assembly in order to ensure the stability of the secondary battery to be generated. It can be determined by cell. Accordingly, it is possible to set injection timings that correspond to the positions of the tabs not only of the electrode assembly to which the NG tag is attached, but also of all other electrode collections adjacent to the left and right of the corresponding electrode assembly.

Meanwhile, FIG. 7(b) shows an example in which a plurality of electrode assemblies are marked when an electrode assembly determined as a defective cell is detected by the NG tag.

As described above, when a specific electrode assembly is detected as a defective cell by the NG tag, the control unit 100 can set injection timings for marking both the specific electrode assembly and the electrode assembly on the left and right of the specific electrode assembly. . And the air injection unit 121 may sequentially spray compressed air according to the set injection timings. Therefore, as shown in (b) of FIG. 7, not only the tag 710 of the electrode assembly to which the NG tag is attached, but also at least some of the tags 711 and 712 of the left and right electrode assembly adjacent to the electrode assembly. can be folded by the injected compressed air. That is, not only the electrode assembly to which the NG tag is attached, but also all of the electrode assembly to the left and right of the electrode assembly can be marked.

Meanwhile, when a defective cell is detected by an NG tag, the defective cell marking device 10 according to an embodiment of the present invention can mark tabs corresponding to all three electrode assemblies, including adjacent electrode assemblies. Therefore, in the defective cell marking device 10 according to an embodiment of the present invention, the distance between the detection unit 110 and the air spray unit 121 is a distance at which at least three tabs can exist, that is, at least three electrode assemblies can be present. It may be desirable to secure. That is, it may be desirable to have a distance between the detection unit 110 and the air injection unit 121 that is at least three times the horizontal width of the electrode assembly cell area. Here, the horizontal width may mean the length of the electrode assembly according to the direction in which the electrode assembly is moved.

On the other hand, if the currently detected defective cell is based on a reading result of an image acquired by the image sensor 112, the control unit 100 may set the injection timing for marking the electrode assembly in which a defect was detected as a result of the image reading. (S606).

Accordingly, the control unit 100 can set one injection timing corresponding to a specific electrode assembly, and the operating state of the air injection unit 121 can transition from the off state (initial state) to the on state according to the set injection timing. there is.

Figure 8 shows an example in which, when an electrode assembly is detected as a defective cell according to the reading result of the image acquired in this way, an injection timing for marking the electrode assembly is set, and one tab is marked according to the set injection timing. This is just one example.

First, referring to (a) of FIG. 8, the detection unit 110 of the defective cell marking device 10 according to an embodiment of the present invention collects the electrode based on the result of reading the image acquired by the image sensor 112. The defective state of the stack can be detected. In this case, the region of interest 800 of the detection unit 110 may be formed to include a specific electrode assembly, and when a defect is detected within the region of interest 800, at least one electrode assembly corresponding to the detected defect Backlogs can be detected as defective cells.

In this case, as described in FIG. 6, the control unit 100 can set the timing of one injection to mark the specific electrode assembly in which the defect was found. And as the tab of one specific electrode assembly is folded in a specific direction according to the set injection timing, marking of one specific electrode assembly in which a defect is found can be performed, as shown in (b) of FIG. 8.

Meanwhile, in the above description, when an NG tag is attached to an electrode assembly, the process of detecting a defective cell by identifying the attached NG tag has been explained.

Hereinafter, in FIG. 9, an example in which an NG tag is attached like this will be described.

First, referring to (a) of FIG. 9 , FIG. 9 (a) shows an example where the NG tag 240 is attached to the uncoated portion 230.

As shown in the first drawing (a) of FIG. 9, when the NG tag 240 is attached to the uncoated portion 230, the defective cell marking device 10 according to an embodiment of the present invention displays the uncoated portion 230. Since marking is performed by folding at least part of the tab formed from ), it is necessary to remove the NG tag 240. Therefore, as shown in the second drawing (a) of FIG. 9, the NG tag 240 is removed, and an NG tape 900, which can replace the removed NG tag 240, is attached to the NG tag 240. It can be attached to a corresponding holding part, that is, at a point on the cell area 200 coated with the active material.

In this case, the NG tape 900 may be attached to a designated location so that it can be recognized by the detection unit 110. In this case, the location where the NG tape 900 is attached can be guided by a laser pointer.

Meanwhile, when the NG tape 900 is attached to the position guided by the laser pointer, notching 230 on the electrode assembly can be performed, as shown in the second drawing (a) of FIG. 9. Then, as shown in the third drawing (a) of FIG. 9 , at least a portion of the uncoated portion 230 may be removed through the notching 230 to form a plurality of tabs 210 .

Meanwhile, when attaching the NG tag 240 to the uncoated portion 230 as shown in (a) of FIG. 9, a process of removing the NG tag 240 and attaching the NG tape 900 is required. Therefore, movement of the electrode assembly may be stopped while attaching the NG tape 900. As a result, the operation rate of the production plant may decrease and the production yield of secondary batteries may decrease.

Accordingly, the NG tag 240 can be attached to a position of the holding unit 200 that can be recognized by the detection unit 110 from the beginning. Figure 9(b) is for explaining this example.

As shown in the first drawing (b) of FIG. 9, the NG tag 240 is not a tab area where marking is performed in the defective cell marking device 10 according to an embodiment of the present invention, but is a tab area marked by the detection unit 110. It may be attached to a preset position of the holding part 200 where detection is performed. Therefore, there may be no need to remove the NG tag 240 for marking.

Therefore, as shown in the second drawing (b) of FIG. 9, notching 230 on the electrode assembly can be performed immediately with the NG tag 240 attached. Then, as shown in the third drawing (b) of FIG. 9 , at least a portion of the uncoated portion 230 may be removed through the notching 230 to form a plurality of tabs 210 . Therefore, since defective cells can be marked based on detection of the NG tag without stopping the movement of the electrode assembly, the operation rate of the production plant can be improved and the production yield of secondary batteries can be increased.

Meanwhile, the marking unit 120 of the defective cell marking device 10 according to an embodiment of the present invention may be provided with a plurality of air injection units, and may further include components such as a regulator capable of controlling the plurality of air injection units. You can.

FIG. 10 is a block diagram showing the configuration of the marking unit 120 assuming that the defective cell marking device 10 according to an embodiment of the present invention has two air injection units.

Referring to FIG. 10, the marking unit 120 according to an embodiment of the present invention may include a first air injection unit 1021 and a second air injection unit 1022, and the first air injection unit ( 1021) and a regulator 1010 connected to the second air injection unit 1022, and a compressed air tank 1000 connected to the regulator 1010.

First, the compressed air tank 1000 may store compressed air to maintain a constant pressure. The compressed air tank 1000 can receive air through a nozzle connected to the outside, and can compress and store the air input through the external nozzle. And the air compressed in the compressed air tank 1000 may be discharged through a nozzle connected to the regulator 1010.

The regulator 1010 connects the first air injection unit 1021 and the second air injection unit 1022 and the compressed air tank 1000, and controls the pressure of air discharged from the compressed air tank 1000. You can. And air having a pressure controlled by the regulator 1010 may flow into the first air injection unit 1021 and the second air injection unit 1022.

And the first air injection unit 1021 and the second air injection unit 1022 each form a compressed air flow path and may include an injection port including a nozzle for ejecting compressed air.

Meanwhile, the first air injection unit 1021 and the second air injection unit 1022 open (turn on) the nozzles included in each injection port under the control of the control unit 100, thereby allowing inflow from the regulator 1010. The compressed air can be sprayed through the nozzle. In addition, the first air injection unit 1021 and the second air injection unit 1022 terminate the injection of compressed air by closing (off) the nozzle included in each injection hole under the control of the control unit 100. It can be formed to do so. Here, the control unit 100 may open the injection port of each air injection unit at the on time included in the set injection timing, and close the injection port of each air injection unit at the off time included in the injection timing.

Meanwhile, in the above description, an example was described in which the detection unit 110 detects a tab, and when the tab is detected, the image sensor 112 is driven to obtain an image of the electrode assembly. However, it goes without saying that the tab of a specific electrode assembly may be lost due to an error in the notching process, or the tab may not be detected due to an error in the tap sensor 111. In this case, the detection unit 110 of the defective cell marking device 10 according to an embodiment of the present invention may further perform a time count, and accordingly, an electrode assembly for detecting defective cells even when a tab is not detected. You can also obtain an image of .

In this case, when a tap is detected, the detection unit 110 can detect the time elapsed since the tap was detected. And, if the next tap is detected before a certain time has elapsed from the time the tap was detected, an image can be acquired through the image sensor 112 according to the detected tap. However, if the next tab is not detected even after a certain amount of time has elapsed from the point at which the tab is detected, it is determined that the detection of the tab is missing and the image sensor 112 is driven to obtain an image of the electrode assembly. . That is, the detection unit 110 may drive the image sensor 112 even if the tap is not detected when a certain amount of time has elapsed since the previous tap has elapsed.

FIG. 11 is a conceptual diagram illustrating the concept of detecting a defective cell through a time count in the defective cell marking device 10 according to an embodiment of the present invention in this case.

In the case as shown in FIG. 11, the constant time, that is, the monitoring time, is calculated according to the tab pitch, the maximum speed at which the electrode assembly moves, and the preset setting range (x). It can be determined as in Equation 1.

Therefore, for example, if the pitch of the tab is 89.1 mm, the preset setting range (x) is 1.05, and the electrode assembly is operated at a maximum line speed of 1000 mm/s, the monitoring time is 0.093 mm/s according to Equation 1 above, That is, it can be calculated as 93ms. In this case, if the next tap is not detected within 93ms after the tap is detected, the detection unit 110 drives the image sensor 112 without the trigger signal of the tap sensor 111, that is, without tap detection, to detect the electrode integrated body. Images can be obtained. In addition, when the image sensor 112 is driven as the monitoring time passes, the number of tap counts is also increased by 1, thereby preventing errors due to the tap count.

Meanwhile, in the above description, only the configuration in which the detection unit 110 detects defective cells and provides the defective cell detection result to the control unit 100 is disclosed. However, differently from this, the control unit 100 may also perform detection of defective cells. Of course. In this case, the detection unit 110 may only perform the role of acquiring an image of the electrode assembly corresponding to the identified tab according to the identification of the tab and providing the obtained image to the control unit 100.

Then, the control unit 100 determines whether the electrode assembly corresponding to the identified tab is defective from the image acquired by the detection unit 110, and detects whether the electrode assembly corresponding to the identified tab is a defective cell. Of course it is possible. In this case, the control unit 100 may set the timing of at least one injection of compressed air according to the electrode assembly in which a defect is detected according to the defective cell detection result determined by the control unit 100.

The present invention described above can be implemented as computer-readable code on a program-recorded medium. Computer-readable media includes all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media include HDD (Hard Disk Drive), SSD (Solid State Disk), SDD (Silicon Disk Drive), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. This also includes those implemented in the form of carrier waves (e.g., transmission via the Internet). Additionally, the computer may include a control unit 100 of the defective cell marking device 10 according to an embodiment of the present invention.

Accordingly, the above detailed description should not be construed as restrictive in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (16)

An apparatus for marking defective cells among a plurality of electrode assemblies coated with an electrode active material on one side, including an uncoated portion not coated with the electrode active material, and having a tab formed by notching the uncoated portion. Because,
a moving member that moves the plurality of electrode assemblies in a specific direction;
a detection unit that identifies tabs of each of the plurality of moving electrode assemblies and acquires an image of the electrode assemblies corresponding to the identified tabs;
a marking portion including an air injection portion formed to direct an area through which the tabs pass; and,
Determine whether the electrode assembly is defective based on the image acquired by the detection unit,
When the tab of at least one specific electrode assembly determined to be defective passes through the area toward which the air injection unit is directed, compressed air is sprayed so that at least a portion of the tab of the at least one specific electrode assembly is folded in one direction. A defective cell marking device comprising a control unit that controls the air injection unit. The method of claim 1, wherein the control unit:
A defective cell marking device that detects whether an NG (Not Good) tag is attached from the acquired image and determines whether the electrode assembly is defective depending on whether the NG tag is attached. The method of claim 2, wherein the control unit,
A defective cell marking device, characterized in that when the specific electrode assembly is determined to be defective due to the NG tag being attached, all of a plurality of other electrode assemblies adjacent to the specific electrode assembly are determined to be defective. According to paragraph 1,
The control unit,
From the acquired image, determine whether there is a defect according to the appearance of the electrode assembly,
Defects according to the appearance of the electrode assembly are:
Bad cell marking, characterized in that the defect is due to at least one of the width of the tab, the pitch of the tab, the tilt state of the tab, the length of the tab, or the active material layer coating state (T coating, B coating) of the cell. Device. According to clause 3 or 4,
The control unit,
Setting the injection timing including the opening and closing time of the injection port of the air injection unit by reflecting the distance between the detection unit and the air injection unit and the moving speed of the plurality of electrode assemblies, and controlling the air injection unit according to the set injection timing Controls the timing and injection time at which compressed air is sprayed through the injection port,
The injection timing is,
A defective cell marking device, characterized in that the number of defects is set to different when the defect is determined by the NG tag and when the defect is determined by the appearance of the electrode assembly. The method of claim 5, wherein the distance between the detection unit and the air injection unit is,
A defective cell marking device characterized in that the horizontal width of the electrode assembly is 3 times or more. The method of claim 1, wherein the marking unit,
It includes a plurality of air injection units,
A first air injection unit among the plurality of air injection units,
The tabs of the specific electrode assembly are arranged to be oriented in a specific direction to be folded,
At least one other air injection unit excluding the first air injection unit,
A defective cell marking device, characterized in that it is arranged to face the upper surface of the folded specific electrode assembly tab. According to paragraph 1,
Between the marking unit and the detection unit, the feature further includes a tab guide including an upper guide that prevents the tabs from being folded in an upward direction, and a lower guide that prevents the tabs from being folded in a downward direction. A defective cell marking device. The method of claim 8, wherein the upper guide and the lower guide are:
A defective cell marking device characterized in that the gap between the upper guide and the lower guide is formed to gradually decrease as it approaches the marking part, and is formed to maintain a minimum gap determined according to the thickness of the tabs after a point. . The method of claim 2, wherein the NG tag is:
A defective cell marking device, characterized in that the electrode active material is attached to a preset position of the coated holding portion. The method of claim 1, wherein the detection unit,
a tab sensor that identifies each tab of a plurality of moving electrode assemblies; and,
A defective cell marking device comprising an image sensor that is activated when the tab is identified as a result of the identification of the tab sensor and acquires an image of the electrode assembly. The method of claim 11, wherein the control unit:
Bad cell marking, characterized in that if the next tap is not detected for a preset monitoring time (tmonitoring) after a tap is detected by the tap sensor, the detection unit is controlled to activate the image sensor to obtain an image of the electrode assembly. Device. The method of claim 12, wherein the monitoring time (tmonitoring) is,
A defective cell marking device characterized in that it is determined according to the following equation according to the tab pitch, the maximum speed at which the electrode assembly moves, and the preset setting range (x).
[Equation]
A defective cell marking device, which includes a detection unit that identifies the tabs of each of a plurality of electrode assemblies moving in a specific direction and an air spray unit configured to spray compressed air into the area through which the tabs pass, marks the defective cell. As for how to do it,
Identifying tabs of each of the plurality of electrode assemblies and counting the identified tabs;
Acquiring an image of an electrode assembly corresponding to the identified tab;
Based on the acquired image, determining whether the electrode assembly is defective;
At least one device that reflects the distance between the detection unit and the air injection unit and the moving speed of the plurality of electrode assemblies, and includes an opening/closing time of the nozzle of the air injection unit according to the type of defect determined from the electrode assembly. Setting injection timing; and,
A defective cell marking method comprising controlling the air injection unit according to the at least one injection timing so that the tabs of the at least one electrode assembly corresponding to the determined defect are folded in a specific direction. The method of claim 14, wherein setting the at least one injection timing comprises:
When a defect in the electrode assembly corresponding to the acquired image is detected due to the attachment of an NG (Not Good) tag, the electrode assembly to which the NG tag is attached and the other electrodes on the left and right of the electrode assembly to which the NG tag is attached A method of marking a defective cell, characterized in that it is a step of setting a plurality of injection timings corresponding to a plurality of electrode assembly tabs so that each tab of the assembly can be folded in a specific direction by the injected compressed air. The method of claim 14, wherein setting the at least one injection timing comprises:
When a defect in the electrode assembly corresponding to the acquired image is detected according to the appearance of the electrode assembly detected from the acquired image, any one electrode assembly tab where the defect is detected is blown by the sprayed compressed air. A defective cell marking method, characterized in that the step of setting one injection timing corresponding to the electrode assembly tab where the defect is detected so that it can be folded in a specific direction.