Electrode autosplicing device and autosplicing method

Abstract

The present invention relates to an auto-splicing device and an auto-splicing method for electrodes, and more particularly, to an auto-splicing device for aligning a running electrode and a new electrode connected to the running electrode and supplied based on a plating line, thereby minimizing connection failure between the running electrode and the new electrode.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0174586 dated December 8, 2021, and all contents disclosed in the documents of that Korean patent application are incorporated as part of this specification.

[0002] The present invention relates to an auto splicing device and method for electrodes used when supplying electrodes through a notching process using a roll-to-roll method during the manufacturing process of a secondary battery. [Background technology]

[0003] In the manufacturing process of a secondary battery, the notching process refers to a process of cutting out an electrode.

[0004] In the cutting process, an electrode to be cut is supplied while unwinding an electrode wound in a roll.

[0005] At this time, when the supply of one electrode wound in a roll is completed, it must be replaced with another electrode, and the process of automatically connecting the replaced electrode is called an auto slicing process. At this time, the electrode being supplied is called a running electrode, and the electrode that is replaced and continuously supplied following the running electrode is called a new electrode. Specifically, the running electrode and the new electrode may be in the form of an electrode sheet, and the electrode sheet may be supplied to a cutting process and cut into individual electrodes.

[0006] In the currently implemented auto-splicing process, if electrode distortion occurs due to meandering between the running electrode and the new electrode when changing electrodes and if the position of the coating line is not aligned properly, an electrode gap is formed at the electrode connection part, resulting in problems such as overhang. In this case, overhang refers to an inconvenience that occurs when the distance between the positive electrode, separator, and negative electrode deviates from the specified specifications when stacking the positive electrode, separator, and negative electrode in the process after notching.

[0007] In addition, there is a problem that when meandering occurs between the traveling electrode and the new electrode, correction is impossible.

[0008] In addition, two EPC (Edge Position Control) sensors detect the running electrode and the new electrode, but because they detect different sides of the running electrode and the new electrode, dimensional errors can occur when connecting the two electrodes, which can reduce process capacity.

[0009] As mentioned above, in the case of the conventional auto-splicing process, even if meandering occurs between the running electrode and the new electrode during electrode connection, it is difficult to correct it, and a gap may occur between the running electrode and the new electrode during electrode connection due to the limitations of the position where the EPC sensor is installed. This can cause dimensional defects in the plating line before and after the connection between the manufactured electrodes, reducing the process capacity, and there is a need to develop technology that can improve these problems. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent No. 1479724 Summary of the Invention [Problem to be solved by the invention]

[0011] The present inventors have conducted extensive research to solve the above problems, and have found that by arranging an EPC, which is a sensor for detecting a running electrode in an electrode autosplicing device, and an EPC for detecting a new electrode that is continuously supplied following the running electrode, facing in the same direction and arranging the EPC to detect a plating line formed on one side of the running electrode and a plating line formed on one side of the new electrode, it is possible to prevent meandering of the running electrode and the new electrode and minimize the formation of a gap at a connection portion between the running electrode and the new electrode. In this case, the one side of the running electrode and the one side of the new electrode detected by the EPC refer to the surfaces that are connected to each other as the same surface when connected.

[0012] Therefore, an object of the present invention is to provide an auto-splicing device and an auto-splicing method for electrodes that can correct meandering between splicing electrodes of electrodes and match and connect plating lines of electrodes. [Means for solving the problem]

[0013] Therefore, the present invention provides an auto-splicing device for electrodes, comprising a first electrode transport unit; a second electrode transport unit; and an electrode supply unit, the first electrode transport unit includes a first unwinding unit that unwinds the first electrode; a first transport unit that transports the unwound first electrode; and a first splicing unit that connects a second electrode to the first electrode when unwinding of the transported first electrode is completed; the second electrode conveying unit includes a second unwinding unit that unwinds the second electrode; a second conveying unit that conveys the unwound second electrode; and a second splicing unit that connects the second electrode to the first electrode; The first splicing part or the second splicing part includes a first EPC (Edge Position Control) sensor and a second EPC sensor on both sides, The first EPC sensor and the second EPC sensor are arranged to face the same direction so as to sense one electrode surface of the first electrode and one electrode surface of the second electrode that are located on the same plane when the first electrode and the second electrode are connected, The first EPC sensor detects a plating line formed on one electrode surface of the first electrode, and the second EPC sensor detects a plating line formed on one electrode surface of the second electrode.

[0014] The first electrode may include a first electrode surface and a second electrode surface, and the first electrode may be wound in a form in which the first electrode surface faces toward a center of the roll and the second electrode surface faces toward an outer corner of the roll.

[0015] The second electrode may include a first electrode surface and a second electrode surface, and may be wound such that the first electrode surface of the second electrode faces toward a center of the roll and the second electrode surface faces toward an outer corner of the roll.

[0016] The first EPC sensor may sense a plating line on a second electrode surface of the first electrode, and the second EPC sensor may sense a plating line on a second electrode surface of the second electrode.

[0017] The first electrode transport unit and the second electrode transport unit may be maintained apart from each other, and when the unwinding of the first electrode is completed by the first electrode transport unit, the first unwinding unit may be separated from the first splicing unit, and the first splicing unit and the second splicing unit may be joined to connect the first electrode and the second electrode and supply them to the electrode supply unit.

[0018] The electrode supply unit may include a third EPC sensor for sensing the second electrode surface of the connected first electrode and the second electrode surface of the connected second electrode.

[0019] The present invention also provides an auto-splicing method including: (a) unwinding a first electrode and supplying it to a notching process; (b) cutting a lower end of the first electrode; (c) sensing and aligning plating lines of the cut first electrode and a second electrode connected to the first electrode; and (d) connecting one end of the first electrode and one end of the second electrode by aligning based on the detected plating lines, wherein the plating lines formed on one electrode surface of the first electrode and the plating lines formed on one electrode surface of the second electrode, which are located on the same plane, are sensed and aligned by a first EPC and a second EPC, respectively.

[0020] In the case where meandering of the first electrode and the second electrode occurs, after stopping the first electrode, a correction may be performed to align a plating line formed on one electrode surface of the first electrode and a plating line formed on one electrode surface of the second electrode located on the same plane. Effect of the Invention

[0021] According to the auto-splicing device and method for electrodes according to the present invention, the electrode splicing process is performed by matching the plating lines of the electrodes, so that it is possible to prevent gaps from occurring at the electrode connection portion and to correct any meandering that occurs at the electrode connection portion. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a schematic diagram showing the positions of plating lines on an electrode. [Figure 2a] FIG. 1 is a schematic diagram of an auto-splicing device for electrodes according to an embodiment of the present invention. [Figure 2b] FIG. 2 is a schematic diagram of an auto-splicing device for electrodes according to another embodiment of the present invention. [Diagram 3] 2 is a schematic diagram of a first electrode A1 and a second electrode A2 connected together according to an embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram showing an auto-splicing process for electrodes according to an embodiment of the present invention. [Figure 5a] FIG. 1 is a schematic diagram of an autosplicing process using a conventional autosplicing device. [Figure 5b] FIG. 1 is a schematic diagram of an autosplicing process using a conventional autosplicing device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings according to the embodiments of the present invention. However, this is for the purpose of making the present invention easier to understand, and the scope of the present invention is not limited thereto.

[0024] The term "coating line" used herein means the boundary between a coated portion, which is a portion coated with an electrode active material, and a non-coated portion, which is a portion not coated with an electrode active material, in an electrode tap.

[0025] FIG. 1 is a schematic diagram showing the positions of plating lines on an electrode.

[0026] Referring to FIG. 1, the electrode 100 includes an electrode surface 110 and an electrode tap 120 protruding from an end of the electrode surface 110. The surface of the electrode surface 110 may be formed with an electrode coating layer coated with an electrode active material. The electrode coating layer may be formed on both sides of the electrode 100. The electrode tap 120 formed by a notching process during the electrode manufacturing process includes a portion on which the electrode coating layer is formed and a portion on which the electrode coating layer is not formed. In the electrode 100, the portion on which the electrode coating layer is formed is called a ground portion 130a, and the portion on which the electrode coating layer is not formed is called a non-coated portion 130b. The boundary of the ground portion 130a, which is the portion on which the electrode coating layer is formed inside the electrode tap 120, is called a plating line (I), which is also called a coating line (I). At this time, if there is a difference in height between the plating lines formed on both sides of the electrode, this is called a mismatch. If the plating line does not meet the specified specifications, problems such as overhanging may occur.

[0027] The terms "first electrode" and "second electrode" used in this specification refer to adjacent electrode sheets among a plurality of electrode sheets that are continuously supplied, and do not mean that only two electrodes are applied in the autosplicing process according to the present invention.

[0028] Auto-splicing device for electrodes The present invention relates to an auto-splicing device for electrodes, which can be used when supplying electrodes in a notching process using a roll-to-roll method during the manufacturing process of secondary batteries.

[0029] 2a and 2b are schematic diagrams of an auto-splicing device for electrodes according to one embodiment of the present invention, and another embodiment of the present invention, respectively;

[0030] As shown in FIG. 2a, an auto-splicing device 1 for electrodes according to one embodiment of the present invention includes a first electrode transport unit 10, a second electrode transport unit 20, and an electrode supply unit 30. In this case, the electrode being supplied is called a running electrode, and the electrode connected to the running electrode and supplied after the running electrode is used up is called a new electrode. In this case, the first electrode A1 is the running electrode and the second electrode A2 is the new electrode.

[0031] In addition, the first electrode transport unit 10 includes a first unwinding unit 11 that unwinds the first electrode A1, a first transport unit 12 that transports the unwound first electrode A1, and a first splicing unit 13 that connects the second electrode A2 to the first electrode A1 when unwinding of the transported first electrode A1 is completed. In this case, the first unwinding unit 11 may include an unwinder (U / W).

[0032] In addition, the second electrode transport unit 20 includes a second unwinding unit 21 that unwinds the second electrode A2, a second transport unit 22 that transports the unwound second electrode A2, and a second splicing unit 23 that connects the second electrode A2 to the first electrode A1. At this time, the second unwinding unit 21 may include an unwinder (U / W).

[0033] In addition, the first splicing portion 13 includes a first EPC (Edge Position Control) sensor 40a and a second EPC sensor 40b arranged in the same direction on both sides, the first EPC sensor 40a sensing the first electrode A1, and the second EPC sensor 40b sensing the second electrode A2.

[0034] The first electrode A1 includes a first electrode surface A1-1 and a second electrode surface A1-2, and is wound in a manner such that the first electrode surface A1-1 of the first electrode A1 faces toward the center of the roll and the second electrode surface A1-2 faces toward the outer corner of the roll.

[0035] The second electrode A2 includes a first electrode surface A2-1 and a second electrode surface A2-2, and is wound in a manner such that the first electrode surface A2-1 of the second electrode A2 faces toward the center of the roll and the second electrode surface A2-2 faces toward the outer corner of the roll.

[0036] At this time, the first electrode A1 is unwound by the first unwinding unit 11, transported by the first transport unit 12, and then supplied to the electrode supply unit 30. When the first electrode A1 is completely used up, the second electrode A2 is connected to the first electrode A1 and continuously supplied. Depending on the process, electrodes such as the third electrode, the fourth electrode, etc. may be continuously supplied.

[0037] An electrode coating layer is formed on both sides of the first electrode A1 and the second electrode A2, and a boundary line between a coated portion where the electrode coating layer is formed and a non-coated portion where the electrode coating layer is not formed is called a plating line.

[0038] When the second electrode A2 is continuously supplied following the first electrode A1, the first electrode surface A1-1 of the first electrode A1 and the first electrode surface A2-1 of the second electrode A2 are connected on the same plane, and the second electrode surface A1-2 of the first electrode A1 and the second electrode surface A2-2 of the second electrode A2 are connected on the same plane. At this time, the second electrode surface A1-2 of the first electrode A1 and the second electrode surface A1-2 of the second electrode A2 are aligned and connected based on the respective plating lines, so that errors in the connection portions can be minimized.

[0039] Therefore, a means is required that can sense the second electrode surface A1-2 of the first electrode A1 and the second electrode surface A1-2 of the second electrode A2 while they are being unwound and transported, and can align and connect the plating lines.

[0040] The first EPC sensor 40a and the second EPC sensor 40b located on both sides of the first splicing unit 13 detect the first electrode A1, and the second EPC sensor 40b detects the second electrode A2. Specifically, the first EPC sensor 40a detects the second electrode surface A1-2 of the first electrode A1 unwound from the first unwinding unit 11, and the second EPC sensor 40b detects the second electrode surface A2-2 of the second electrode A2. Therefore, the first EPC sensor 40a and the second EPC sensor 40b detect the exact position of the plating line, and the aligned second electrode surfaces A1-2 and A2-2 are connected to connect the first electrode A1 and the second electrode A2, so that the gap due to the mismatch between them can be minimized.

[0041] Alternatively, the first EPC sensor 40a and the second EPC sensor 40b (not shown) may be located on both sides of the second splicing portion 23. The first EPC sensor 40a and the second EPC sensor 40b may be located in the same direction to sense the electrode surface where the plating lines of the first electrode and the second electrode are aligned side by side.

[0042] In addition, if meandering occurs during the process of connecting the first electrode A1 and the second electrode A2, it can be corrected by performing an operation of aligning the plating lines of the first electrode A1 and the second electrode A2 before splicing to connect the first electrode A1 and the second electrode A2.

[0043] For example, the first electrode A1, which is a traveling electrode, is stopped and the lower end of the first electrode A1 is cut. After detecting the plating lines of the first electrode A1 and the second electrode A2 using the first EPC sensor 40a and the second EPC sensor 40b, one end of the first electrode A1 and one end of the second electrode A2 connected to one end of the first electrode A1 are moved to meet and connected, and the two electrodes are connected so that the plating lines of the first electrode A1 and the second electrode A2 are aligned in a row, and auto-splicing is performed to correct meandering.

[0044] In addition, the electrode supply unit 30 to which the connected first electrode A1 and second electrode A2 are supplied may include a third EPC sensor 40c. At this time, the connected first electrode A1 and second electrode A2 may be supplied to a notching process for cutting out individual electrodes.

[0045] The third EPC sensor 40c, like the first EPC sensor 40a and the second EPC sensor 40b, continuously senses the second electrode surface A1-2 of the first electrode and the second electrode surface A2-2 of the second electrode to check whether the alignment of these plating lines is maintained so as not to deviate from the specifications defined in the notching process, and to make corrections when meandering occurs.

[0046] In addition, the first electrode transporter 10 and the second electrode transporter 20 are maintained in a spaced apart state from each other.

[0047] When the unwinding of the first electrode is completed by the first electrode transport unit 10, the first unwinding unit 11 and the first transport unit 12 may be separated from the first splicing unit 13, and the first splicing unit 13 and the second splicing unit 23 may be joined, and then the first electrode A1 and the second electrode A21 may be connected and supplied to the electrode supply unit 30.

[0048] FIG. 2b shows a case where the second electrode A2 is a traveling electrode and the first electrode A1 is a new electrode, and the driving principle is the same as that of the embodiment shown in FIG. 2a.

[0049] 3 is a schematic diagram of a first electrode A1 and a second electrode A2 connected according to an embodiment of the present invention, where the first electrode A1 may be a running electrode and the second electrode A2 may be a new electrode.

[0050] As shown in FIG. 3, a first electrode A1 and a second electrode A2 may be connected based on a plating line (I) aligned by the first EPC sensor and the second EPC sensor.

[0051] For example, the electrode surfaces sensed by the first EPC sensor and the second EPC sensor may be the second electrode surface A1-2 of the first electrode A1 and the second electrode surface A2-2 of the second electrode A2.

[0052] Auto-splicing method for electrodes The present invention also relates to an auto-splicing method for electrodes, which can be applied when electrodes are supplied in a notching process using a roll-to-roll method during the manufacturing process of a secondary battery.

[0053] FIG. 4 is a schematic diagram showing an autosplicing process for electrodes according to one embodiment of the present invention.

[0054] As shown in FIG. 4, an auto-splicing process for electrodes according to one embodiment of the present invention includes: (a) a step of unwinding a first electrode and supplying it to a notching process (Step 1); (b) a step of cutting a lower end of the first electrode (Step 2); (c) a step of detecting and aligning plating lines of the cut first electrode and a second electrode connected to the first electrode (Step 3); and (d) a step of connecting one end of the first electrode and one end of the second electrode by aligning them based on the detected plating lines (Step 4). The plating lines formed on one surface of the first electrode and the plating lines formed on one surface of the second electrode, which are located on the same plane, may be detected and aligned by a first EPC and a second EPC, respectively.

[0055] In addition, the first EPC sensor and the second EPC sensor detect whether the alignment of the plating line formed on one side of the first electrode and the plating line formed on one side of the second electrode is maintained. If the alignment of the plating line deviates from the baseline and meandering occurs, a correction operation is performed to align the plating lines of the first electrode and the second electrode, and then the auto splicing operation can be performed again.

[0056] In addition, after the first and second electrodes are connected to complete the auto-splicing process, the electrodes may be supplied to a notching process by an electrode supply unit. At this time, a third EPC sensor located in the electrode supply unit may continuously detect whether the alignment of the plating lines of the first and second electrodes is maintained. The third EPC sensor may detect the plating lines of the same electrode surface as the electrode surface detected by the first and second EPC sensors.

[0057] 5a and 5b are schematic diagrams of an auto-splicing process using a conventional auto-splicing device as a comparative embodiment of the present invention.

[0058] FIG. 5a is a schematic diagram of an auto-splicing process in which a running electrode A1 is replaced with a new electrode A2. The auto-splicing device 1 includes a first electrode transport unit 10, a second electrode transport unit 20, and an electrode supply unit 30.

[0059] In addition, the first electrode transport unit 10 includes a first unwinding unit 11 that unwinds the first electrode A1; a first transport unit 12 that transports the unwound first electrode A1; and a first splicing unit 13 that connects a second electrode A2 to the first electrode A1 when unwinding of the transported first electrode A1 is completed.

[0060] In addition, the second electrode transport unit 20 includes a second unwinding unit 21 that unwinds the second electrode A2; a second transport unit 22 that transports the unwound second electrode A2; and a second splicing unit 23 that connects the second electrode A2 to the first electrode A1.

[0061] In addition, a first EPC (Edge Position Control) sensor 40a is located at the first splicing portion 13, and a second EPC sensor 40b is located at the second splicing portion 23. The first EPC sensor 40a senses a second electrode surface A1-2 of a first electrode, and the second EPC sensor 40b senses a first electrode surface A2-1 of a second electrode.

[0062] When the first electrode and the second electrode are connected, the first electrode surface A1-1 of the first electrode A1 and the first electrode surface A2-1 of the second electrode A2 are positioned on the same plane, and the second electrode surface A1-2 of the first electrode A1 and the second electrode surface A2-2 of the second electrode A2 are positioned on the same plane.

[0063] However, as described above, the first EPC sensor 40a senses the second electrode surface A1-2 of the first electrode A1, and the second EPC sensor senses the first electrode surface A2-1 of the second electrode A2, and since the electrode surfaces that are not on the same plane are sensed and the plating lines are aligned, defects may occur in the connecting parts when connecting these electrodes.

[0064] FIG. 5b is a schematic diagram of an auto-splicing process in which the running electrode A2 is replaced with a new electrode A1, and the same problems as those in the auto-splicing process of FIG. 5a may occur.

[0065] According to the auto-splicing process using the conventional auto-splicing device, the electrodes may be twisted due to the meandering of the running electrode and the new electrode at the time of electrode replacement, and a gap may occur at the connection part of the running electrode and the new electrode due to the misalignment of the electrode plating line, which may result in the appearance of an overhang. At this time, the meandering means that the alignment of the running electrode or the new electrode is twisted with respect to the path line, and even if the meandering occurs, it is impossible to correct it.

[0066] In addition, since the second electrode surface of the running electrode is sensed by the first EPC sensor, while the first electrode surface of the new electrode is sensed, different surfaces of the electrodes are sensed, making it difficult to accurately align the plating lines of the running electrode and the new electrode, and a gap may occur between the running electrode and the new electrode during the auto-splicing process.

[0067] FIG. 5b is a schematic diagram of an auto-splicing process in which the running electrode A2 is replaced with a new electrode A1, and in this case the positions of the running electrode and the new electrode are changed compared to FIG. 5a. The same problems as those in the auto-splicing process of FIG. 5a may occur.

[0068] Those skilled in the art will appreciate that various applications and modifications within the scope of the present invention are possible based on the above content.

[0069] Although the present invention has been described above using limited examples and drawings, the present invention is not limited thereto, and it is of course possible for a person having ordinary skill in the art to which the present invention pertains to make various modifications and variations within the technical spirit of the present invention and the equivalent scope of the claims described below. [Explanation of symbols]

[0070] 1: Auto splicing device 10:First electrode transfer section 11: Volume 1 12: 1st transfer section 13: First splicing section 20:Second electrode transfer section 21: Volume 2 22:Second transfer section 23: Second splicing section 30: Electrode supply section 40a: 1st EPC sensor 40b: Second EPC sensor 40c: 3rd EPC sensor A1: 1st electrode A2: 2nd electrode 100: Electrode 110: Electrode surface I: Plating line

Claims

1. An auto-splicing device for electrodes, comprising: a first electrode transport unit; a second electrode transport unit; and an electrode supply unit; the first electrode transport unit includes a first unwinding unit that unwinds a first electrode; a first transport unit that transports the unwound first electrode; and a first splicing unit that connects a second electrode to the first electrode when unwinding of the transported first electrode is completed; the second electrode transport unit includes a second unwinding unit that unwinds the second electrode; a second transport unit that transports the unwound second electrode; and a second splicing unit that connects the second electrode to the first electrode; The first splicing part or the second splicing part includes a first EPC (Edge Position Control) sensor and a second EPC sensor on both sides thereof, the first EPC sensor and the second EPC sensor are disposed in the same direction to sense one electrode surface of the first electrode and one electrode surface of the second electrode that are on the same plane when the first electrode and the second electrode are connected, the first EPC sensor detects a plating line formed on one electrode surface of the first electrode, and the second EPC sensor detects a plating line formed on one electrode surface of the second electrode, and connecting one end of the first electrode to one end of the second electrode by aligning the plating line detected by the first EPC sensor and the plating line detected by the second EPC sensor. Auto splicing device for electrodes.

2. the first electrode includes a first electrode surface and a second electrode surface; 2. The electrode autosplicing device according to claim 1, wherein the first electrode is wound such that the first electrode surface faces toward the center of the roll and the second electrode surface faces toward an outer corner of the roll.

3. the second electrode includes a first electrode surface and a second electrode surface; 2. The electrode autosplicing device according to claim 1, wherein the second electrode is wound such that the first electrode surface faces toward the center of the roll and the second electrode surface faces toward an outer corner of the roll.

4. 2. The electrode autosplicing device of claim 1, wherein the first EPC sensor detects a plating line on a second electrode surface of the first electrode, and the second EPC sensor detects a plating line on a second electrode surface of the second electrode.

5. The first electrode transporting portion and the second electrode transporting portion are maintained in a spaced apart state from each other, 2. The auto splicing device for electrodes according to claim 1, wherein when the unwinding of the first electrode is completed by the first electrode transport unit, the first unwinding unit is separated from the first splicing unit, the first splicing unit and the second splicing unit are joined, and the first electrode and the second electrode are connected and supplied to the electrode supply unit.

6. The electrode autosplicing device of claim 1 , wherein the electrode supply unit includes a third EPC sensor that senses the second electrode surface of the connected first electrode and the second electrode surface of the connected second electrode.

7. (a) unwinding a first electrode and feeding it to a notching process; (b) cutting a lower end of the first electrode; (c) sensing and aligning the cut first electrodes and plating lines of second electrodes connected to the first electrodes; and (d) connecting one end of the first electrode and one end of the second electrode in alignment with the detected plating line; An auto-splicing method in which a plating line formed on one electrode surface of the first electrode and a plating line formed on one electrode surface of the second electrode, which are located on the same plane, are sensed by a first EPC and a second EPC, respectively, and aligned.

8. When meandering of the first electrode and the second electrode occurs, The autosplicing method according to claim 7, further comprising: after stopping the first electrode, performing a correction to align a plating line formed on one electrode surface of the first electrode and a plating line formed on one electrode surface of the second electrode located on the same plane.

9. The method includes a step of providing an electrode and a step of notching, A method for producing a secondary battery, wherein in the step of supplying the electrodes, the electrodes are supplied by the autosplicing method according to claim 7 or 8.

Images