Electrode roll connection automation equipment

Abstract

The present invention relates to an automated electrode roll connection device, which can uniformly maintain the width of electrode connection tabs during the process of connecting electrode sheets to each other and can automatically connect the electrode sheets to each other. The automated electrode roll connection device includes: a first supply unit configured to supply a first electrode sheet formed with electrode connection tabs; a second supply unit configured to supply a second electrode sheet formed with electrode connection tabs; a connection unit configured to connect the first electrode sheet and the second electrode sheet to each other; and an electrode connection tab sensing unit disposed between the first supply unit and the connection unit, the electrode connection tab sensing unit being configured to measure the distance between the electrode connection tabs.

Description

Technical Field

[0001] This application claims the benefit of priority of Korean Patent Application No. 2020-0087017, filed on Jul. 14, 2020, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to an electrode roll connection automation device, and more particularly, to an electrode roll connection automation device including an electrode tab sensing unit configured to measure a distance between electrode tabs so that a cutting interval of electrode sheets is uniformly maintained in a moving direction of the electrode sheets during a process of connecting two electrode sheets to each other. Background Art

[0003] Lithium secondary batteries capable of charging and discharging have been widely used as an energy source for wireless mobile devices or wearable devices worn on the body, and have also been used as an energy source for electric vehicles and hybrid electric vehicles proposed as alternatives to existing gasoline and diesel vehicles that cause air pollution.

[0004] In a lithium secondary battery, a positive electrode and a negative electrode are stacked with a separator interposed therebetween, and lithium ions move between the positive electrode and the negative electrode, so that the lithium secondary battery repeats charging and discharging.

[0005] The process of manufacturing electrodes including a positive electrode and a negative electrode includes the following steps: coating an electrode agent on the remaining portion of an electrode sheet wound in a roll form except for a portion where an electrode tab is to be formed; drying and rolling the electrode agent; slitting the electrode sheet; and cutting the slit electrode sheet into unit electrodes.

[0006] The electrode manufacturing process is performed as a roll-to-roll continuous process. When the electrode roll wound in a roll form is consumed during continuous manufacturing of electrodes using the electrode roll, a worker stops the equipment, connects the end of the electrode roll in use to the end of a new electrode roll using tape, and re-operates the equipment.

[0007] However, when connecting the end of the electrode roll in use to the end of a new electrode roll using tape, a difference in the width between electrode tabs is generated. This difference increases when the skills of the worker are low.

[0008] In addition, when the electrode sheet is cut into unit electrodes at a uniform speed while the electrode sheet is being conveyed at a uniform speed, if a difference in the width between electrode tabs occurs, the cutting position changes when the electrode sheet is cut into unit electrodes, thereby producing defective electrodes.

[0009] In this regard, Patent Document 1 discloses an electrode production system that includes a member configured to automatically replace the electrode material mounted on one of a plurality of electrode material supply reels with the electrode material mounted on another electrode material supply reel, but does not disclose a technique for connecting electrode materials to each other while uniformly maintaining the distance between electrode tabs.

[0010] Patent Document 2 relates to an electrode sheet cutting device and a cutting method. The electrode sheet cutting device includes a sensing unit and a cutting unit. The sensing unit is configured to sense a notch recess of an electrode sheet and generate a notch recess sensing signal. The cutting unit is configured to cut a portion of the electrode sheet where the notch recess is located when passing through a cutting point in response to the notch recess sensing signal generated by the sensing unit.

[0011] However, Patent Document 2 does not teach or disclose a method and related equipment for connecting two electrode sheets to each other so that the widths of the electrode tabs are uniform.

[0012] In addition, Patent Document 3 discloses an automatic electrode film replacement device, but does not disclose a technique for checking the distance between electrode tabs when the electrode films are connected to each other.

[0013] Therefore, there is a high need for a technique that can connect electrode sheets with uniform quality regardless of the skills of workers and can uniformly maintain the width of electrode tabs, thereby preventing defects from occurring when the electrode sheets are cut into unit electrodes.

[0014] (Prior Art Documents)

[0015] (Patent Document 1) Korean Patent Publication No. 10-1857396 (May 11, 2018)

[0016] (Patent Document 2) Korean Patent Application Publication No. 2019-0127283 (November 13, 2019)

[0017] (Patent Document 3) Korean Patent Application Publication No. 2016-0133264 (November 22, 2016) Summary of the Invention

[0018] Technical Problem

[0019] In view of the above problems, the present invention has been made. The object of the present invention is to provide an electrode roll connection automation device that can maintain the width of electrode tabs in a uniform size when connecting electrode sheets to each other, thereby preventing defects from occurring during electrode cutting, and continuously supplying electrode rolls without interrupting the electrode manufacturing process.

[0020] Technical Solution

[0021] To achieve the above object, the electrode roll connection automation device according to the present invention includes: a first supply unit configured to supply a first electrode sheet formed with electrode tabs; a second supply unit configured to supply a second electrode sheet formed with electrode tabs; a connection unit configured to connect the first electrode sheet and the second electrode sheet to each other; and an electrode tab sensing unit disposed between the first supply unit and the connection unit, the electrode tab sensing unit being configured to measure the distance between the electrode tabs of the first electrode sheet.

[0022] In the electrode roll connection automation device according to the present invention, the second supply unit is configured to have a structure in which the second supply unit unwinds to supply the second electrode sheet for connection with the first electrode sheet, and after the first electrode sheet and the second electrode sheet are connected to each other, the second supply unit rewinds to rewind the first electrode sheet and the second electrode sheet.

[0023] In the electrode roll connection automation device according to the present invention, the electrode tab sensing unit may include a transmitter configured to emit a signal and a receiver configured to receive the signal, the transmitter and the receiver being arranged to face each other, and when the electrode tab of the first electrode sheet passes between the transmitter and the receiver, the electrode tab sensing unit may measure the distance between the electrode tabs of the first electrode sheet.

[0024] In the electrode roll connection automation device according to the present invention, the connection unit may include a cutter configured to cut an end portion of a starting portion of the first electrode sheet so that the distance between the electrode tabs measured by the electrode tab sensing unit is maintained when the first electrode sheet and the second electrode sheet are connected to each other.

[0025] The electrode roll connection automation device according to the present invention may further include a tape attaching unit configured to connect the first electrode sheet and the second electrode sheet to each other.

[0026] In the electrode roll connection automation device according to the present invention, a recess may be formed in an outer edge of the first electrode sheet that is not formed with an electrode tab and is one of the outer edges on opposite sides in the moving direction of the first electrode sheet, and the electrode roll connection automation device may further include an edge position control (EPC) sensor configured to sense the position of the recess.

[0027] In addition, the moving direction of the first electrode sheet or the second electrode sheet may be adjusted in response to the sensing of the EPC sensor.

[0028] The present invention provides an automatic electrode roll connection method for connecting the electrode rolls using the automated equipment. Specifically, the automatic electrode roll connection method includes the following steps: (a) unwinding a first electrode sheet; (b) measuring the distance between the electrode tabs of the first electrode sheet when the first electrode sheet passes through the electrode tab sensing unit; (c) cutting the end portion of the starting part of the first electrode sheet based on the distance between the electrode tabs of the first electrode sheet; and (d) connecting the first electrode sheet and the second electrode sheet to each other.

[0029] In the automatic electrode roll connection method according to the present invention, step (b) can be performed using a sensor capable of measuring the distance between the electrode tabs of the first electrode sheet.

[0030] In the automatic electrode roll connection method according to the present invention, step (b) can be performed together with the process of sensing the position of the recess of the first electrode sheet.

[0031] In addition, the present invention provides electrode sheets that are connected to each other using the electrode roll connection automated equipment, wherein the width of the unit electrode formed at the connection portion between the first electrode sheet and the second electrode sheet is equal to the width of the unit electrode of the first electrode sheet and the width of the unit electrode of the second electrode sheet.

[0032] Advantageous Effects

[0033] As is apparent from the above description, the electrode roll connection automated equipment according to the present invention is configured to automatically perform the process of connecting the electrode sheets to each other, so that the electrode sheets can be connected to each other with uniform quality regardless of the skills of the workers.

[0034] In addition, since it includes an electrode tab sensing unit, the electrode sheets can be connected to each other such that the width of the electrode tabs is uniformly maintained.

[0035] In addition, since an EPC sensor is used, the first electrode sheet and the second electrode sheet can be connected to each other such that the first electrode sheet and the second electrode sheet are uniformly aligned in their moving directions.

[0036] Therefore, it is possible to prevent defective unit electrodes from being manufactured due to differences in the width between the electrode tabs during the cutting process of manufacturing the unit electrodes. Description of the Drawings

[0037] Figure 1 is a perspective view of the electrode roll connection automated equipment according to the present invention.

[0038] Figure 2 shows Figure 1Perspective view of the process of cutting the first electrode sheet after passing through the electrode connection sheet sensing unit.

[0039] Figure 3 Is a perspective view showing an electrode roll connection automation device including an EPC sensor.

[0040] Figure 4 Is a plan view showing a portion where the first electrode sheet and the second electrode sheet are connected to each other.

[0041] Figure 5 Is a perspective view showing the process of connecting the first electrode sheet and the second electrode sheet to each other using a tape attaching unit. Detailed Description of the Invention

[0042] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those of ordinary skill in the art to which the present invention pertains can easily implement the preferred embodiments of the present invention. However, in the detailed description of the working principles of the preferred embodiments of the present invention, when the detailed description of known functions and configurations incorporated herein may obscure the gist of the present invention, the detailed description will be omitted.

[0043] In addition, the same reference numerals will be used throughout the drawings to denote components that perform similar functions or operations. In the case where a component is referred to as being connected to another component throughout the application, the one component may not only be directly connected to the other component, but the one component may also be indirectly connected to the other component via additional components. In addition, including a certain element does not mean excluding other elements, but means that other elements may be further included, unless otherwise specified.

[0044] In addition, unless specifically restricted, the description of specifying elements by limitation or addition can be applied to all inventions and does not limit specific inventions.

[0045] In addition, in the description of the present invention and the claims of this application, unless otherwise mentioned, the singular form is intended to include the plural form.

[0046] In addition, in the description of the present invention and the claims of this application, unless otherwise mentioned, "or" includes "and". Therefore, "including A or B" means three cases, namely, the case of including A, the case of including B, and the case of including both A and B.

[0047] In addition, unless the context clearly indicates otherwise, all numerical ranges include the lowest value, the highest value, and all intermediate values therebetween.

[0048] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0049] Figure 1It is a perspective view of an electrode roll connection automation device according to the present invention.

[0050] Referring Figure 1 , the electrode roll connection automation device according to the present invention includes: a first supply unit configured to supply a first electrode sheet 110 formed with electrode tabs 101; a second supply unit configured to supply a second electrode sheet 120 formed with electrode tabs 101; a connection unit 200 configured to connect the first electrode sheet 110 and the second electrode sheet 120 to each other; and an electrode tab sensing unit 300 disposed between the first supply unit and the connection unit 200, the electrode tab sensing unit 300 being configured to measure the distance between the electrode tabs 101.

[0051] When the second electrode sheet, which is a moving electrode, is consumed during the electrode manufacturing process performed in a roll-to-roll continuous process, it is necessary to perform a process of connecting the first electrode sheet, which is a spare electrode, to the end of the second electrode sheet.

[0052] For the electrode sheet formed with electrode tabs, depending on the position of the connection portion between the moving electrode and the spare electrode, there will be a difference in the width between the electrode tabs. If there is a difference in the width between the electrode tabs, the cutting position will change during the process of cutting the electrode sheet into unit electrodes, resulting in the formation of a plurality of defective electrodes.

[0053] Therefore, in the present invention, before connecting the first electrode sheet and the second electrode sheet to each other, the distance between the electrode tabs of the first electrode sheet is measured so that the distance between the electrode tabs is uniform when the first electrode sheet and the second electrode sheet are connected to each other. The distance between the electrode tabs is measured by passing the electrode tabs of the first electrode sheet through the electrode tab sensing unit 300. The measurement of the distance between the electrode tabs will be described in detail below.

[0054] The cutting position of the end of the starting portion of the first electrode sheet can be accurately calculated based on the distance between the electrode tabs measured as described above. The end of the starting portion of the first electrode sheet can be cut based on the value calculated as described above.

[0055] At this time, the portion of the first electrode sheet to be cut is determined in consideration of the position of the end of the end portion of the second electrode sheet. Preferably, the end of the end portion of the second electrode sheet is cut so that an electrode tab is provided at the connection portion of the second electrode sheet. The end portion of the second electrode sheet can be cut to form a connection portion of the second electrode sheet so that the width of the electrode tab formed at the connection portion of the second electrode sheet is 50% of the width of the other electrode tabs.

[0056] Therefore, a connection portion of the first electrode sheet is formed at an end portion of the starting portion of the first electrode sheet, such that an electrode tab formed at the connection portion of the first electrode sheet has a size equal to 50% of the width of other electrode tabs, and the electrode tab formed at the connection portion of the first electrode sheet and the electrode tab formed at the connection portion of the second electrode sheet are connected to each other by butt welding, so that an electrode tab having a width equal to the width of other electrode tabs can be formed.

[0057] As described above, the first electrode sheet and the second electrode sheet are connected to each other in a state where the connection portion of the second electrode sheet and the connection portion of the first electrode sheet are arranged not to overlap each other, so that the electrode sheets can be connected to each other, and the width of the electrode tabs and the distance between the electrode tabs are kept uniform.

[0058] In the present invention, as described above, the first electrode sheet and the second electrode sheet can be connected to each other, so that the distance between the electrode tabs is kept uniform. Therefore, the cutting interval is uniformly maintained during the process of cutting the connected electrode sheets into unit electrodes. As a result, it is possible to prevent the problem of defective electrodes formed due to the deviation of the cutting position when cutting the electrode sheets into unit electrodes in the case where the distance between the electrode tabs changes in the conventional process of connecting the moving electrode and the spare electrode.

[0059] In Figure 1 In the first supply unit shown, the first roller 111 unwinds to draw out the first electrode sheet 110, and a plurality of conveying rollers 103 are provided on the lower surface of the first electrode sheet 110 to convey the first electrode sheet 110 in the x-axis direction.

[0060] Alternatively, the jig can convey the first electrode sheet 110 while clamping opposite two side ends of the first electrode sheet.

[0061] The second supply unit is configured to have such a structure that the second roller 121 unwinds to supply the second electrode sheet 120 for connection with the first electrode sheet 110, and after the first electrode sheet and the second electrode sheet are connected to each other, the second roller 121 rewinds to rewind the first electrode sheet 110 and the second electrode sheet 120.

[0062] In the electrode tab sensing unit 300, a transmitter 310 configured to emit a signal and a receiver 320 configured to receive a signal are arranged to face each other, and the distance between the electrode tabs 101 of the first electrode sheet 110 is measured when the electrode tab 101 of the first electrode sheet 110 passes between the transmitter 310 and the receiver 320.

[0063] In a specific example, when the emitter 310 emits light or a wavelength towards the receiver 320, when the electrode tab 101 passes between the emitter 310 and the receiver 320, the light or wavelength is reflected or blocked by the electrode tab 101, so that the light or wavelength does not reach the receiver. On the other hand, when the portion of the first electrode sheet where the electrode tab is not formed passes between the emitter 310 and the receiver 320, the light or wavelength can reach the receiver.

[0064] The time when the light or wavelength emitted by the emitter reaches or does not reach the receiver can be calculated together with the moving speed of the first electrode sheet, so that the width of the electrode tab and the distance between the electrode tabs can be calculated. The first electrode sheet can be cut at a point corresponding to 50% of the width of the electrode tab based on the calculated value. Therefore, a connection portion of the first electrode sheet connected to the second electrode sheet can be prepared.

[0065] The above method can be used to calculate the width of the electrode tab and the distance between the electrode tabs.

[0066] However, the method for the electrode tab sensing unit to sense the distance between the electrode tabs and the width of the electrode tab is not limited to the above method.

[0067] Figure 2 is a perspective view showing Figure 1 the process of cutting the first electrode sheet after passing through the electrode tab sensing unit.

[0068] Referring to Figure 2 , when the first electrode sheet 110 passes through the electrode tab sensing unit 300, the distance between the electrode tabs is measured, and the end of the starting portion of the first electrode sheet 110 is attached to the connecting unit 200.

[0069] The connecting unit 200 can fix the first electrode sheet 110 by adsorption.

[0070] The connecting unit 200 includes a cutter 210 configured to cut the end of the starting portion of the first electrode sheet 110 so that the distance between the electrode tabs measured by the electrode tab sensing unit is maintained when the first electrode sheet 110 and the second electrode sheet are connected to each other.

[0071] The cutter 210 can cut the first electrode sheet 110 while moving along the slit 220 formed in the connecting unit.

[0072] When the first electrode sheet and the second electrode sheet are connected to each other, the sizes of the unit electrodes fabricated from the first electrode sheet and the unit electrodes fabricated from the second electrode sheet must be kept uniform. To this end, a method is used in which the distance between electrode tabs is measured using an electrode tab sensing unit; the portion of the first electrode sheet to be cut is calculated so that the distance between electrode tabs remains consistent; and the end portion of the starting portion of the first electrode sheet is cut based on the calculation.

[0073] In this connection, the width of the electrode sheet at the end portion of the end portion of the second electrode sheet and the width of the electrode sheet at the end portion of the starting portion of the first electrode sheet are cut to be 50% of the width of the other electrode sheets, so that the distance between electrode tabs is uniform when the first electrode sheet and the second electrode sheet are connected to each other. Accordingly, when the second electrode sheet and the first electrode sheet are connected to each other, the electrode tabs of the connecting portion of the second electrode sheet and the electrode tabs of the connecting portion of the first electrode sheet are connected to each other, thereby forming an electrode tab having a size equal to the width of the other electrode tabs.

[0074] Accordingly, the unit electrodes formed from the first electrode sheet and the unit electrodes formed from the second electrode sheet can have the same pitch formed parallel to the moving direction of the first electrode sheet and the second electrode sheet.

[0075] The pitch refers to the size of the electrode in the width direction perpendicular to the protruding direction of the electrode tab.

[0076] However, even when using an electrode tab sensing unit, there are limitations in making the sizes of the unit electrodes equal in the z-axis direction perpendicular to the moving direction of the first electrode sheet and the second electrode sheet.

[0077] Accordingly, in the electrode roll connection automation device according to the present invention, a recess may be formed in an outer edge of the first electrode sheet that does not form an electrode tab and is one of the opposite outer edges in the moving direction thereof, and an EPC sensor configured to sense the position of the recess may be further included.

[0078] In this connection, Figure 3 is a perspective view showing an electrode roll connection automation device including an EPC sensor.

[0079] Referring to Figure 3 , an electrode tab 101 is formed at a first end that is one of the opposite two ends of the first electrode sheet 110 in its moving direction, and a recess 102 is formed at the second end.

[0080] The electrode tab sensing unit 300 can measure the distance between electrode tabs to make the pitch of the unit electrodes equal.

[0081] The EPC sensor 400 that senses the position of the recess formed in the first electrode piece 110 can check whether the second end of the first electrode piece coincides with the second end of the second electrode piece when the first electrode piece and the second electrode piece are connected to each other.

[0082] In the case where, as a measurement result of the EPC sensor, the second end of the first electrode piece and the second end of the second electrode piece do not coincide with each other, the connection unit that fixes the first electrode piece can move in the z-axis direction, thereby aligning the first electrode piece and the second electrode piece in the z-axis direction. At this time, preferably, the alignment deviation of the first electrode piece and the second electrode piece in the z-axis direction is within 1 mm.

[0083] Figure 4 is a plan view showing a portion where the first electrode piece and the second electrode piece are connected to each other.

[0084] Refer to Figure 4 , the first electrode piece 110 is located below, the second electrode piece 120 is located above, and the first electrode piece and the second electrode piece are connected to each other via a tape 150 in a state where they are set not to overlap each other.

[0085] The width w2 of one of the electrode tabs connected to each other via the tape 150 is 50% of the width w1 of the other electrode tab that is not cut and connected. The two electrode tabs connected to each other via the tape are arranged adjacent to each other, so that an electrode tab having the same size as the width w1 of the other electrode tab can be formed.

[0086] Therefore, the width P of the unit electrode can be formed to have a uniform value.

[0087] Figure 5 is a perspective view showing a process of connecting the first electrode piece and the second electrode piece to each other using a tape attaching unit.

[0088] Refer to Figure 5 , the tape attaching unit 500 includes: a supply unit 510 configured to supply a tape; a jig 520 configured to transfer the tape supplied by the supply unit 510 to an attaching unit 530; and an attaching unit 530 configured to move to a portion where the first electrode piece and the second electrode piece are connected to each other while fixing the tape. In addition, the jig 520 may be provided with a tape cutter (not shown) configured to cut the tape.

[0089] The jig 520 holds the end of the tape roll and arranges the tape so that the non-adhesive surface of the tape is located on the outer surface of the attaching unit 530. At this time, the attaching unit 530 fixes the non-adhesive surface of the tape by adsorption. The adsorption of the attaching unit can be performed in the same manner as the adsorption portions of each of the first connection unit and the second connection unit. A vacuum decompression adsorption method can be used.

[0090] The jig 520 returns to the position before the tape is set at the attachment portion 530, and cuts the tape drawn out from the tape roll while being clamped. At this time, the tape is cut into a length required to attach to the connection portion of the electrode sheet, and the tape is fixed to the attachment portion 530 by adsorption.

[0091] The attachment portion 530 can be moved by a transfer device and can be moved to the connection portion of the first electrode sheet and the second electrode sheet to attach the tape to the connection portion.

[0092] The automatic electrode roll connection method using the electrode roll connection automation device according to the present invention includes the following steps: (a) unwinding the first electrode sheet; (b) measuring the distance between the electrode tabs when the first electrode sheet passes through the electrode tab sensing unit; (c) cutting the end portion of the starting portion of the first electrode sheet based on the distance between the electrode tabs; and (d) connecting the first electrode sheet and the second electrode sheet to each other.

[0093] Step (b) can be performed using a sensor capable of measuring the distance between the electrode tabs. Optionally, step (b) can be performed together with the process of sensing the position of the recess of the first electrode sheet.

[0094] In the electrode sheets connected to each other using the electrode roll connection automation device and the automatic electrode roll connection method according to the present invention, the width of the unit electrode formed at the connection portion of the first electrode sheet and the second electrode sheet can be formed to be equal to the width of the unit electrode of the first electrode sheet and the width of the unit electrode of the second electrode sheet.

[0095] Therefore, in the electrode manufacturing process performed in a roll-to-roll process, the process of connecting the electrode sheets to each other is performed quickly and accurately, so that the defect rate can be reduced while significantly improving the work efficiency.

[0096] Those skilled in the art to which the present invention pertains will understand that, based on the above description, various applications and modifications are possible within the scope of the present invention.

[0097] (Description of reference numerals)

[0098] 101: Electrode tab

[0099] 102: Recess

[0100] 103: Transfer roller

[0101] 110, 110’: First electrode sheet

[0102] 111: First roller

[0103] 120: Second electrode sheet

[0104] 121: Second roller

[0105] 150: Tape

[0106] 200: Connecting unit

[0107] 210: Cutter

[0108] 220: Slit

[0109] 300: Electrode tab sensing unit

[0110] 310: Transmitter

[0111] 320: Receiver

[0112] 400: EPC sensor

[0113] 500: Tape attaching unit

[0114] 510: Supply section

[0115] 520: Fixture

[0116] 530: Attaching section.

[0117] Industrial applicability

[0118] As is apparent from the above description, the electrode roll connection automation device according to the present invention is configured to automatically perform the process of connecting electrode sheets to each other, so that the electrode sheets can be connected to each other with uniform quality regardless of the skills of workers.

[0119] In addition, since the electrode tab sensing unit is included, the electrode sheets can be connected to each other so that the width of the electrode tabs is uniformly maintained.

[0120] In addition, since the EPC sensor is used, the first electrode sheet and the second electrode sheet can be connected to each other so that the first electrode sheet and the second electrode sheet are uniformly aligned in their moving directions.

[0121] Therefore, it is possible to prevent defective unit electrodes from being manufactured due to differences in the width between electrode tabs during the cutting process of manufacturing unit electrodes.

Claims

1. An electrode roll connection automation device, comprising: A first supply unit configured to supply a first electrode sheet formed with electrode tabs; A second supply unit configured to supply a second electrode sheet formed with electrode tabs; A connection unit configured to connect the first electrode sheet and the second electrode sheet to each other; And An electrode tab sensing unit disposed between the first supply unit and the connection unit, the electrode tab sensing unit being configured to measure the distance between the electrode tabs of the first electrode sheet before the connection unit connects the first electrode sheet and the second electrode sheet to each other, Wherein a recess is formed in an outer edge of the first electrode sheet that does not form an electrode tab and is one of the outer edges on opposite sides of the first electrode sheet in its moving direction, and Wherein the electrode roll connection automation device further includes an edge position control sensor disposed between the first supply unit and the connection unit and configured to sense the position of the recess.

2. The electrode roll connection automation device according to claim 1, wherein the second supply unit is configured to have a structure such that the second supply unit unwinds to supply the second electrode sheet for connection with the first electrode sheet, and after the first electrode sheet and the second electrode sheet are connected to each other, the second supply unit rewinds to rewind the first electrode sheet and the second electrode sheet.

3. The electrode roll connection automation device according to claim 1, wherein the electrode tab sensing unit includes a transmitter configured to emit a signal and a receiver configured to receive the signal, the transmitter and the receiver being arranged to face each other, and Wherein when the electrode tab of the first electrode sheet passes between the transmitter and the receiver, the electrode tab sensing unit measures the distance between the electrode tabs of the first electrode sheet.

4. The electrode roll connection automation device according to claim 1, wherein the connection unit includes a cutter configured to cut an end portion of a starting portion of the first electrode sheet such that the distance between the electrode tabs measured by the electrode tab sensing unit is maintained when the first electrode sheet and the second electrode sheet are connected to each other.

5. The electrode roll connection automation device according to claim 1, further including a tape attaching unit configured to connect the first electrode sheet and the second electrode sheet to each other.

6. The electrode roll connection automation device according to claim 1, wherein the moving direction of the first electrode sheet or the second electrode sheet is adjusted in response to the sensing of the edge position control sensor.

7. An automatic electrode roll connection method using the electrode roll connection automation device according to any one of claims 1 to 6, the automatic electrode roll connection method comprising the following steps: (a) Unwinding a first electrode sheet; (b) Measuring the distance between the electrode tabs of the first electrode sheet when the first electrode sheet passes through the electrode tab sensing unit; (c) Cut the end of the starting portion of the first electrode sheet based on the distance between the electrode tabs of the first electrode sheet; and (d) Connect the first electrode sheet and the second electrode sheet to each other, wherein step (b) is performed together with the process of sensing the position of the recess of the first electrode sheet.

8. The automatic electrode roll connection method according to claim 7, wherein step (b) is performed using a sensor capable of measuring the distance between the electrode tabs of the first electrode sheet.

9. An electrode sheet connected to each other using the electrode roll connection automation device according to claim 1, wherein the width of the unit electrode formed at the connection portion of the first electrode sheet and the second electrode sheet is equal to the width of the unit electrode of the first electrode sheet and the width of the unit electrode of the second electrode sheet.

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