KR20240010356A - Method and apparatus for judging defect during manufacturing unit cell - Google Patents

Abstract

The method for determining defects in the manufacturing of a unit cell according to the present invention is to separate the first separator from the first separator and the second separator while the first separator supplied relatively downward and the second separator supplied relatively upward are continuously supplied. An electrode insertion step in which one electrode is stacked at regular intervals and the second electrode is aligned with each first electrode on the second separator; An irradiation step of irradiating electromagnetic waves from the bottom of the first separator upward or from the top of the second separator downward while the first electrode and the second electrode are moving; A light receiving step of receiving transmitted electromagnetic waves from the opposite side of the point where electromagnetic waves are irradiated; And by analyzing the received electromagnetic waves, at least one of the distance between neighboring first electrodes or the distance between neighboring second electrodes and the second electrode, or the stacking state of the first and second electrodes aligned vertically. It includes a determination step of determining a defect by measuring one, and the electromagnetic wave is characterized in that it can penetrate the first separator, the second separator, the first electrode, and the second electrode.

Description

{Method and apparatus for judging defect during manufacturing unit cell}

The present invention provides a method and device for determining defects when manufacturing a unit cell, which can more quickly and accurately determine whether a defect has occurred depending on the alignment state of the first and second electrodes included in the unit cell. It's about.

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

A secondary battery is composed of an electrode assembly and an electrolyte solution built into a case (pouch, can, etc.). The electrode assembly mounted inside the case has a repetitive stacked structure of anode/separator/cathode, and can be charged and discharged multiple times. Electrode assemblies are manufactured in a variety of ways, but the stacked method is generally manufactured by manufacturing unit cells in advance and then stacking a plurality of unit cells.

That is, referring to FIG. 1A, which shows a simplified view of manufacturing a unit cell according to a conventional method, the method for manufacturing a unit cell includes, from the top, a second electrode 20, a second separator 40, and a first electrode. It is configured to stack the electrode 10 and the first separator 30 in that order. That is, the second separator 40 and the first separator 30 are supplied continuously without being broken, and the first electrode 10 and the second electrode 20 are cut to a predetermined size by cutters 50. It is supplied in a cut state and aligned in the vertical direction (at this time, if the first electrode is an anode, the second electrode is a cathode, and if the first electrode is a cathode, the second electrode is an anode, but the cathode has a larger area). Therefore, it is preferable that the first electrode is a cathode). The first electrode 10 is supplied between the second separator 40 and the first separator 30, and the second electrode 20 is supplied over the second separator 40.

Then, it passes through the laminating device 60 in a laminated state, and the contact points of the first separator 30, the first electrode 10, the second separator 40, and the second electrode 20 are heat fused. It comes true.

At this time, as shown in Figure 1b, where the first electrode 10 and the second electrode 20 are arranged at a distance from the neighboring first electrode 10 and the second electrode 20, respectively, the neighboring first electrode 10 and the second electrode 20 The distance (a) between the first electrode 10 and the first electrode 20, the distance between the neighboring second electrode 20 and the second electrode 20, and the end of the stacked first electrode 10 The distance c between and the end of the second electrode 20 is set to lie within a predetermined range.

That is, the first and second separators 30 and 40 are continuously connected, but the first and second electrodes 10 and 20 are kept at a certain distance from the neighboring first and second electrodes 10 and 20. After passing through the laminating device 60, the first and second separators 30 and 40 are cut by the cutter 50 between them (between neighboring first and second electrodes) to manufacture individual unit cells. .

In addition, as shown in FIG. 1C, which shows the first and second separators 30 and 40 being bonded between the neighboring first and second electrodes 10 and 20, the first and second separators ( 30, 40) are sometimes bonded before cutting to prevent fluttering after cutting or pushing of the separator during cutting. However, in order for this adhesion to be achieved, heat and pressure must be applied to each of the first separator 30 and the second separator 40. At this time, the alignment of the first electrode 10 and the second electrode 20 may be unintentional. A blurring problem could have occurred. And, if the alignment is disturbed, defects may occur after a plurality of unit cells are stacked and manufactured into an electrode assembly.

That is, in the unit cell manufacturing process, the distance (a) and position management between neighboring electrodes 10 and 20 are important matters in managing defects in the unit cell. Accordingly, defects are managed by additionally placing a measuring device 70 to measure the distance (a) between electrodes at the rear of the laminating device 60.

As shown in Figure 1d, which shows the arrangement of a conventional measuring device in a conventional structure, it is disposed above the second electrode 20 to emit visible light downward and receive reflected visible light again. .

However, the conventional measuring device 70 has a problem in that the amount of transmitted light varies depending on the state of adhesion (laminated state) between the separators 30 and 40 and the electrodes 10 and 20, which reduces accuracy, and the reflected Since it is a method of sensing visible light, there was a risk that the accuracy of the sensor could be reduced by the environment of the production process or foreign substances such as dust.

Therefore, the main purpose of the present invention is to provide a method and device for determining defects in the manufacture of unit cells that can determine whether defects have occurred by determining the alignment state of electrodes more quickly and accurately than conventional measurement methods.

The method for determining defects during the manufacturing of a unit cell according to the present invention for achieving the above-mentioned object is a method for determining defects during the manufacturing of a unit cell, and includes a first separator supplied relatively downward and a first separator supplied relatively upward. While the two separators are continuously supplied, the first electrode is stacked between the first separator and the second separator at regular intervals, and the second electrode is placed on the second separator so that it is aligned on each first electrode. Input stage; An irradiation step of irradiating electromagnetic waves from the bottom of the first separator upward or from the top of the second separator downward while the first electrode and the second electrode are moving; A light receiving step of receiving transmitted electromagnetic waves from the opposite side of the point where electromagnetic waves are irradiated; And by analyzing the received electromagnetic waves, at least one of the distance between neighboring first electrodes or the distance between neighboring second electrodes and the second electrode, or the stacking state of the first and second electrodes aligned vertically. It includes a determination step of determining a defect by measuring one, and the electromagnetic wave is characterized in that it can penetrate the first separator, the second separator, the first electrode, and the second electrode.

The electromagnetic waves are X-rays.

The first electrode and the second electrode have a rectangular shape, but the first electrode is manufactured to have a larger width (left and right direction based on FIG. 3) than the second electrode, and is manufactured along the direction in which the first electrode and the second electrode move. The second electrode is stacked so as not to exceed the projected area of the first electrode.

In the step of determining a defect, if the distance between the first electrode and the neighboring first electrode is outside a predetermined range, it may be determined to be defective.

In the step of determining a defect, if the distance between the neighboring second electrodes is outside a predetermined range, it may be determined to be defective.

In the step of determining a defect, if the distance between the end side of the vertically aligned first electrode and the end side of the second electrode is outside a predetermined range, it may be determined to be defective.

The first electrode is a cathode and the second electrode is an anode.

The light receiving unit that receives the electromagnetic waves transmits data about the received electromagnetic waves to the control unit. The control unit images the shape onto which the electromagnetic waves are projected based on the received data and sends the screen to the display device. The imaged shape differs in shade. It is sent to distinguish the boundary between the anode and the cathode.

In addition, the defect discriminating device during the manufacturing of a unit cell additionally provided by the present invention is a defect discriminating device during the manufacturing of a unit cell, in which a first electrode is inserted between the first separator and the second separator, and the first electrode is placed on the second separator. a sliding portion that moves the first electrode and the second electrode in a state in which the two electrodes are aligned on each first electrode; an irradiation unit that irradiates electromagnetic waves from the bottom of the first separator upward or from the top of the second separator downward; A light receiving unit that receives electromagnetic waves transmitted from the opposite side of the point where electromagnetic waves are irradiated; and a control unit that analyzes the received electromagnetic waves to determine defects, wherein the electromagnetic waves radiated from the irradiation unit can penetrate the first separator, the second separator, the first electrode, and the second electrode, and the control unit controls the first electrode. and determining defects through a projected image of the portion where the second electrode is laminated.

The control unit is connected to the display device and outputs a projected image of the portion where the first electrode and the second electrode are stacked to the display device.

The present invention, which has the above technical features, detects and receives electromagnetic waves that can penetrate the first and second separators and the first and second electrodes to determine the relative positions of the first and second electrodes, thereby solving the problems of the prior art (separators It is possible to minimize or eliminate the problem of accuracy being degraded due to the amount of transmitted light varying depending on the state of adhesion between the electrodes and accuracy being degraded due to foreign substances and the process environment.

In the present invention, the distance between the first electrode and the first electrode, the distance between the second electrode and the second electrode, and the distance between the end side of the vertically aligned first electrode and the end side of the second electrode can be more accurately confirmed, Based on this, it is possible to determine whether a defect has occurred.

In the present invention, data on the received electromagnetic waves are transmitted to a display device so that the operator can visually check whether a defect has occurred.

Figure 1a is a simplified diagram showing how a unit cell is manufactured according to a conventional method.
FIG. 1B is a diagram illustrating each of the first and second electrodes arranged at a distance from the neighboring first and second electrodes.
FIG. 1C is a diagram showing first and second separators bonded between neighboring first and second electrodes.
Figure 1d is a diagram showing a conventional measuring device arranged in a conventional structure.
Figure 2 is a simplified view showing how a unit cell is manufactured according to the method provided by the present invention.
Figure 3 is a diagram showing the device according to the present invention outputting projected images of the first electrode and the second electrode.

Hereinafter, based on the attached drawings, the present invention will be described in detail so that those skilled in the art can easily practice it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

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

In addition, terms or words used in this specification and patent claims should not be construed as limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to explain his or her invention in the best way. It must be interpreted with meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

The present invention relates to a method for determining defects and a device for determining defects in the manufacture of unit cells that can quickly and accurately determine the alignment state of electrodes and determine whether defects have occurred. Hereinafter, with reference to the attached drawings, the present invention provides The embodiments are described in more detail.

First embodiment

The present invention provides, as a first embodiment, a defect determination method that can be applied when manufacturing a unit cell.

Figure 2 is a simplified diagram showing how a unit cell is manufactured according to the method provided by the present invention, and Figure 3 shows the device according to the present invention outputting projected images of the first electrode and the second electrode. This is the drawing shown. However, in Figure 3, the projected images of the first and second separator portions are omitted.

The method for determining defects when manufacturing a unit cell according to this embodiment includes an electrode insertion step, an irradiation step, a light reception step, and a discrimination step.

In the electrode input step, as explained above based on FIG. 1A, while the first separator 30 supplied relatively downward and the second separator 40 supplied relatively upward are continuously supplied, the first separator 30 is supplied relatively upward. The first electrode 10 (cut by a cutter) is inserted between (30) and the second separator 40 at regular intervals, and the electrode (cut by a cutter) is placed on the second separator 40. Two electrodes 20 are inserted at regular intervals. At this time, the second electrode 20 is inserted in an aligned state to lie on the first electrode 10. More precisely, as shown in FIG. 3, the first electrode 10 is inserted so as not to deviate from the second electrode 20 along the width direction (left and right directions in FIG. 3) and the longitudinal direction (up and down directions in FIG. 3).

For reference, in the manufacturing method of the unit cell provided in this embodiment, as described above, the first and second electrodes 10 and 20 pass through the laminating device 60 (see FIG. 1A) in a stacked state, and The contact points of the first separator 30, the first electrode 10, the second separator 40, and the second electrode 20 are heat fused. After passing through the laminating device 60, the first and second separators 30 and 40 are cut by a cutter 50 (see FIG. 1A) between them (between neighboring first and second electrodes) to form individual It is manufactured as a unit cell, but an irradiation step and a light receiving step are performed before cutting into individual unit cells or before entering the laminating device 60 or before cutting the separators. However, the discrimination step may be performed before or after cutting into individual unit cells. However, it is preferable that the first and second electrodes 10 and 20, through which defects are determined, undergo an irradiation step, a light reception step, and a discrimination step before entering the laminating device 60.

In the irradiation step, while the first electrode 10 and the second electrode 20 are moving, electromagnetic waves are radiated upward from the bottom of the first separator 30 or from the top of the second separator 40 to the bottom. It comes true. At this time, the irradiated electromagnetic wave is irradiated as an If it can penetrate the fields 30 and 40 and the first and second electrodes 10 and 20, the output of electromagnetic waves (e.g., ultraviolet rays, etc.) in different wavelength bands can be controlled and irradiated.

And, the light receiving step is accomplished by receiving the electromagnetic waves that have passed through the first and second separators 30 and 40 and the first and second electrodes 10 and 20 on the opposite side of the point where the electromagnetic waves are irradiated. That is, when the irradiation unit 1 for irradiating electromagnetic waves is placed at the top so that the first electrode 10 and the second electrode 20 are positioned between them, the light receiving unit 2 for receiving electromagnetic waves is placed at the bottom, and the irradiation unit 1 ) is placed at the bottom, the light receiving part 2 is placed at the top and receives electromagnetic waves.

The data of the received electromagnetic waves is transmitted to the control unit 3, and the control unit 3 analyzes the received data to determine whether a defect has occurred. In other words, the determination step is accomplished by the operation of the control unit 3 and the derivation of results.

The control unit 3 analyzes the received electromagnetic wave and determines the 'distance (a) between the neighboring first electrode 10 and the first electrode 10' or 'the neighboring second electrode 20 and the second electrode ( 20) At least one of 'the distance (b)' or 'the stacking state according to the distance (c) between one side of the vertically aligned first electrode 10 and one side of the second electrode 20' Measure and analyze to determine whether a defect has occurred.

That is, as shown more clearly in FIG. 3, the first electrode 10 and the second electrode 20 are manufactured to have a rectangular shape, and the first electrode 10 is manufactured to have a larger width than the second electrode 20. , the second electrode 20 is stacked along the direction in which the first electrode 10 and the second electrode 20 move so that the first electrode 10 does not deviate from the projected area.

For reference, to ensure stability and prevent capacity waste, the electrode assembly is manufactured so that the cathode has a larger area than the anode. Therefore, it is preferable that the first electrode 10 is a cathode and the second electrode 20 is an anode.

Therefore, the distance (c) between the side of the second electrode 20 and the side of the first electrode 10 (based on FIG. 3) must be maintained within a certain range along the up-down and left-right directions to enable the stacking of a plurality of unit cells in the future. When this is achieved, the stacking stability of the electrode assembly can be increased and the possibility of short circuit occurring can be reduced.

In addition, when the first and second separators 30 and 40 are cut, the first and second separators 30 and 40 protruding from the first electrode 10 must also have a certain length. Therefore, the distance (a) between neighboring first electrodes 10 must also be maintained within a certain range.

Therefore, in the step of determining a defect, the control unit says, '① if the distance (a) between the neighboring first electrode and the first electrode is outside the predetermined range', '② between the neighboring second electrode and the second electrode. 'If the distance (b) is outside the predetermined range', '③ If the distance (c) between the end side of the vertically aligned first electrode and the end side of the second electrode is outside the predetermined range', it can be judged as defective. You can. In other words, it can be judged as defective even if only one of the three conditions (①, ②, ③) is met, or it can be judged as defective only when two conditions are met, and it can be configured to be judged as defective only when all three conditions are met. there is.

In addition, in the defect determination method provided in this embodiment, the light receiving unit 2, which receives electromagnetic waves, guides the operator as to whether a defect has occurred, and allows the worker to determine the status of defects by viewing the screen, and sends data about the received electromagnetic waves to the control unit ( 3), and the control unit 3 images the shape projected by electromagnetic waves based on the received data and sends the screen to the display device 4. The imaged shape is divided into anode and cathode due to the difference in shade. It can be transmitted so that boundaries are distinguished.

Second embodiment

The present invention provides, as a second embodiment, a defect determination device that can be applied when manufacturing unit cells.

The device for determining defects in the manufacturing of unit cells provided in this embodiment includes a sliding portion (5), an irradiating portion (1), a light receiving portion (2), and a control portion (3).

Referring to FIG. 2, as described above, in the present invention, while the first separator 30 supplied relatively downward and the second separator 40 supplied relatively upward are continuously supplied, the first separator 30 ) and the second separator 40, the first electrode 10 (cut by a cutter) is inserted at regular intervals, and the second electrode (cut by a cutter) is placed on the second separator 40. (20) is input at regular intervals.

Accordingly, the sliding portion 5 has the first electrode 10 inserted between the first separator 30 and the second separator 40, and the second electrode 20 on the second separator 40. It is configured to move the first electrode 10 and the second electrode 20 (together with the first and second separators) in a state in which they are aligned on the first electrode 10. The sliding portion 5 is located below the first separator 30 and moves the first electrode 10 and the second electrode 20 together by transporting the first separator 30 in a seated state.

The sliding portion 5 may be provided as a known device used in the unit cell manufacturing process, such as a conveyor device in which a plurality of rollers rotate a belt. However, a specific point or specific area may be transparent or have an open portion so that electromagnetic waves radiated from the irradiation unit 1 can pass through, or may be made of a material that does not affect the transmission of X-rays.

In addition, the irradiation unit 1 is arranged to irradiate electromagnetic waves from the bottom to the top of the first separator 30 or from the top to the bottom of the second separator 40. The electromagnetic waves radiated from the irradiation unit 1 are X-rays that can penetrate the first and second separators 30 and 40 and the first and second electrodes 10 and 20.

The light receiving unit 2 is disposed above the second separator 40 when the irradiating unit 1 is placed below the first separator 30, and when the irradiating unit 1 is placed above the second separator 40, the first separator ( 30) It is disposed below and receives electromagnetic waves that have passed through the first electrode 10 and the second electrode 20.

The light receiving unit 2 is connected to the control unit 3 electrically or through wireless communication and transmits data about the received electromagnetic waves. The control unit 3 analyzes the received electromagnetic waves and determines whether a defect has occurred according to predetermined logic.

That is, the electromagnetic waves radiated from the irradiation unit 1 pass through the first separator 30, the second separator 40, the first electrode 10, and the second electrode 20 and are collected into the light receiving unit 2. , the light receiving unit 2 transmits the collected electromagnetic wave data to the control unit 3. The control unit 3 converts electromagnetic wave data into a projected image of the electromagnetic wave and analyzes the projected image to determine whether a defect has occurred.

As described above, the control unit 3 analyzes the received electromagnetic wave (by analyzing the image converted from the electromagnetic wave) to determine the distance (a) between the first electrode 10 and the neighboring first electrode 10. Determine whether a defect has occurred by measuring and analyzing at least one of the distance (b) between the first and second electrodes 20 or the stacking state of the first and second electrodes aligned vertically. do.

In addition, the control unit 3 is connected to the display device 4 and outputs a projected image of the portion where the first electrode 10 and the second electrode 20 are stacked to the display device 4.

The present invention, which has the above technical features, detects and receives electromagnetic waves that can penetrate the first and second separators 30 and 40 and the first and second electrodes 10 and 20, thereby forming the first and second electrodes (10). , 20), minimizing conventional problems (problems where accuracy is degraded due to the amount of transmitted light varying depending on the adhesion between separators and electrodes, and accuracy is degraded due to foreign substances and the process environment). Or it can be resolved.

In the present invention, the distance between the first electrode and the first electrode, the distance between the second electrode and the second electrode, and the distance between the end side of the vertically aligned first electrode and the end side of the second electrode can be more accurately confirmed, Based on this, it is possible to determine whether a defect has occurred.

In the present invention, data on the received electromagnetic waves are transmitted to a display device so that the operator can visually check whether a defect has occurred.

Although the present invention has been described above with limited examples and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following description will be provided by those skilled in the art in the technical field to which the present invention pertains. Various implementations are possible within the scope of equivalency of the patent claims.

1: Investigation Department
2: light receiving part
3: Control unit
4: Display device
5: slide part
10: first electrode
20: second electrode
30: first separator
40: second separator

Claims (10)

As a method for determining defects when manufacturing unit cells,
While the first separator supplied relatively downward and the second separator supplied relatively upward are continuously supplied, the first electrode is stacked at regular intervals between the first separator and the second separator. An electrode insertion step of inserting the second electrode onto the separator so that it is aligned with each first electrode;
An irradiation step of irradiating electromagnetic waves from the bottom of the first separator upward or from the top of the second separator downward while the first electrode and the second electrode are moving;
A light receiving step of receiving transmitted electromagnetic waves from the opposite side of the point where electromagnetic waves are irradiated; and
By analyzing the received electromagnetic waves, at least one of the following: the distance between neighboring first electrodes and the first electrode, the distance between the neighboring second electrodes and the second electrode, or the stacking state of the first and second electrodes aligned vertically. It includes a determination step of measuring and determining defects,
The electromagnetic wave is a method for determining defects in the manufacture of a unit cell capable of penetrating a first separator, a second separator, a first electrode, and a second electrode.
According to claim 1,
A method for determining defects in the manufacture of unit cells where the electromagnetic waves are X-rays.
According to claim 2,
The first electrode and the second electrode are manufactured to have a rectangular shape, and the first electrode is manufactured to have a larger width than the second electrode,
A method for determining defects in the manufacture of unit cells in which the second electrode is stacked along the direction in which the first electrode and the second electrode move so that the second electrode does not deviate from the projected area of the first electrode.
According to claim 3,
A method for determining defects in the manufacturing of a unit cell in which, in the step of determining defects, the defect is determined if the distance between the first electrode and the neighboring first electrode is outside a predetermined range.
According to claim 3,
A defect determination method in the manufacturing of a unit cell in which, in the step of determining defects, the defect is determined if the distance between the second electrode and the neighboring second electrode is outside a predetermined range.
According to claim 3,
In the step of determining defects, if the distance between the end side of the vertically aligned first electrode and the end side of the second electrode is outside a predetermined range, the defect determination method in the manufacturing of a unit cell is determined to be defective.
The method according to any one of claims 3 to 6,
A method for determining defects when manufacturing a unit cell in which the first electrode is a cathode and the second electrode is an anode.
According to claim 7,
The light receiving unit that receives the electromagnetic waves transmits data about the received electromagnetic waves to the control unit, and the control unit images the shape onto which the electromagnetic waves are projected based on the received data and transmits the screen to the display device,
The imaged shape is a method of determining defects in the manufacture of unit cells where the boundary between the anode and cathode is distinguished by the difference in shade.
As a defect determination device in the manufacturing of unit cells,
A sliding portion that moves the first electrode and the second electrode in a state in which the first electrode is inserted between the first separator and the second separator, and the second electrode is inserted on the second separator so that each first electrode is aligned;
an irradiation unit that irradiates electromagnetic waves from the bottom of the first separator upward or from the top of the second separator downward;
A light receiving unit that receives electromagnetic waves transmitted from the opposite side of the point where electromagnetic waves are irradiated; and
It includes a control unit that analyzes the received electromagnetic waves to determine defects,
The electromagnetic wave irradiated from the irradiation unit can penetrate the first separator, the second separator, the first electrode, and the second electrode, and the control unit determines the defect through the projected image of the portion where the first electrode and the second electrode are stacked. A device for determining defects in the manufacturing of unit cells.
According to clause 9,
The control unit is connected to a display device, and outputs a projected image of a portion where the first electrode and the second electrode are stacked to the display device.

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