Secondary battery manufacturing apparatus and secondary battery manufacturing method using the same

Abstract

The present invention relates to an apparatus for manufacturing a secondary battery and a method for manufacturing a secondary battery using the same, and more particularly to an apparatus for manufacturing a secondary battery that slits an electrode and a method for manufacturing a secondary battery using the same. The present invention provides an apparatus for manufacturing a secondary battery, further comprising: at least one unwinder unit that unwinds an electrode sheet on which an electrode active material is applied and dried; at least one first slitting unit that receives the electrode sheet from the unwinder unit and performs a primary cut on the electrode sheet to form a plurality of first unit electrode sheets; at least one second slitting unit that receives the first unit electrode sheet from the first slitting unit and performs a secondary cut on the first unit electrode sheet to form a plurality of second unit electrode sheets; at least one rewinder unit that receives the second unit electrode sheet from the second slitting unit and winds it up; and a frame unit having a slitting space provided therein; the first slitting unit and the second slitting unit are installed on the frame unit.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0020454, filed on February 16, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to an apparatus for manufacturing a secondary battery and a method for manufacturing a secondary battery using the same, and more particularly to an apparatus for manufacturing a secondary battery that slits an electrode and a method for manufacturing a secondary battery using the same. [Background technology]

[0003] In general, a secondary battery is a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Such secondary batteries are widely used in the field of advanced electronic devices such as mobile phones, notebook computers, and comcorders.

[0004] Such a secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked, and a case that houses the electrode assembly. The electrode assembly has a structure in which a plurality of electrodes and a plurality of separators are alternately stacked.

[0005] The secondary battery includes an electrode manufacturing process for manufacturing an electrode, an electrode assembly assembling process for assembling the manufactured electrode and a separator to form an electrode assembly, and a process for manufacturing the secondary battery by housing the manufactured electrode assembly in a case.

[0006] Here, the electrode manufacturing process typically includes a coating process of coating an electrode active material on an electrode sheet and drying it, a pressing process of pressing the electrode after the coating process, and a slitting process of cutting the electrode to a predetermined width after the pressing process.

[0007] Here, in the slitting process, the primary slitter and secondary slitter cut the electrodes in sequence, and conventionally, equipment such as a rewinder and an unwinder was duplicated in the primary slitter and secondary slitter, which increased the work time and reduced the electrode yield.

[0008] Therefore, there is a need to develop a technique to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been devised to solve the above problems, and an object of the present invention is to provide a secondary battery manufacturing apparatus and a secondary battery manufacturing method using the same, which can significantly increase electrode productivity by introducing primary and secondary slitters into an electrode slitting device and performing both primary and secondary slitting in one facility. [Means for solving the problem]

[0010] The present invention provides an apparatus for manufacturing a secondary battery, further comprising: at least one unwinder unit that unwinds an electrode sheet on which an electrode active material is applied and dried; at least one first slitting unit that receives the electrode sheet from the unwinder unit and performs a primary cut on the electrode sheet to form a plurality of first unit electrode sheets; at least one second slitting unit that receives the first unit electrode sheet from the first slitting unit and performs a secondary cut on the first unit electrode sheet to form a plurality of second unit electrode sheets; at least one rewinder unit that receives the second unit electrode sheet from the second slitting unit and winds it up; and a frame unit having a slitting space provided therein; the first slitting unit and the second slitting unit are installed on the frame unit.

[0011] The secondary battery manufacturing apparatus according to the present invention may further include at least one first position correcting unit that is provided on a moving path of the electrode sheet and detects a position of the electrode sheet to correct the position of the electrode sheet.

[0012] The first position correction portion may be attached to the frame portion.

[0013] The first position correction unit may include a first position detection unit that detects a position of the electrode sheet; and a first position adjustment unit that adjusts a position of the electrode sheet based on position information of the electrode sheet acquired from the first position detection unit.

[0014] The first position sensing unit may include an LPC sensor.

[0015] The first position adjustment portion may include a pivot roller.

[0016] In addition, the secondary battery manufacturing apparatus according to the present invention may further include at least one second position correcting unit disposed between the first slitting unit and the second slitting unit and configured to sense a position of the first unit electrode sheet and correct the position of the first unit electrode sheet.

[0017] The second position correcting units may be provided in a number corresponding to the number of first unit electrode sheets cut and formed from the first slitting unit.

[0018] The second position correction unit may include a second position detection unit that detects a position of the first unit electrode sheet; and a second position adjustment unit that adjusts a position of the first unit electrode sheet based on position information of the first unit electrode sheet acquired from the second position detection unit.

[0019] The second position sensing unit may include an LPC sensor.

[0020] The second position adjustment portion may include a pivot roller.

[0021] The frame portion may include a bottom portion; a pair of pillar portions extending upward from the bottom portion; a wall portion coupled to side surfaces of the pair of pillar portions; and a cover portion coupled to upper surfaces of the pair of pillar portions; and the cover portion having an input hole through which the electrode sheet is input into the slitting space.

[0022] The first unit electrode sheets may branch out and move from the first slitting portion toward the pair of pillars; the rewinder portion may be provided in a plurality of units and fixedly installed on the pair of pillars to face each other.

[0023] The first slitting portion and the second slitting portion may be fixedly installed on the wall portion.

[0024] Meanwhile, the present invention provides a method for manufacturing a secondary battery, comprising: an unwinding step of unwinding an electrode sheet on which an electrode active material is applied and dried; a first slitting step of primarily cutting the electrode sheet to form a plurality of first unit electrode sheets after the unwinding step; a second slitting step of secondly cutting the first unit electrode sheet to form a plurality of second unit electrode sheets after the first slitting step; and a rewinding step of winding up the second unit electrode sheet after the second slitting step; the unwinding step, the first slitting step, the second slitting step, and the rewinding step are performed continuously.

[0025] The method of manufacturing a secondary battery according to the present invention may further include a first position correcting step of detecting a position of the electrode sheet and correcting the position of the electrode sheet between the unwinding step and the first slitting step.

[0026] In addition, the method of manufacturing a secondary battery according to the present invention may further include a second position correcting step of sensing a position of the first unit electrode sheet and correcting the position of the first unit electrode sheet between the first slitting step and the second slitting step. Effect of the Invention

[0027] In the present invention, the first slitting unit and the second slitting unit are installed on the frame unit, so that the process can be performed in one device. This allows the process to be integrated, and redundant devices to be eliminated, simplifying the equipment. This has the advantage of reducing the equipment space and reducing the investment cost during mass production.

[0028] In addition, the present invention includes a first position correction unit and / or a second position correction unit, which can prevent misalignment of the electrodes transported for slitting, thereby reducing the product defect rate and improving product reliability. [Brief description of the drawings]

[0029] [Figure 1] 1 is a side view showing an aspect of a secondary battery manufacturing apparatus according to a first embodiment of the present invention. [Diagram 2] 2 is an enlarged side view showing the first slitting section, the second slitting section, the rewinder section, and the frame section in the secondary battery manufacturing apparatus of FIG. 1. FIG. [Diagram 3] 10 is a flowchart showing the flow of a secondary battery manufacturing method according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and should not be construed as being limited to the following embodiments.

[0031] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the description or of related known technologies that may obscure the gist of the present invention will be omitted, and in this specification, when adding reference numbers to components in each drawing, the same or similar reference numbers will be used for the same or similar components throughout the specification.

[0032] Furthermore, the terms and words used in this specification and the claims should not be interpreted limited to their ordinary and dictionary meanings, but should be interpreted in a way that is consistent with the technical ideas of the present invention, based on the principle that the inventor himself / herself can appropriately define the concepts of terms in order to explain the invention in the best possible manner.

[0033] Secondary battery manufacturing equipment The present invention provides a secondary battery manufacturing apparatus 1, further including at least one unwinder unit 100 that unwinds an electrode sheet on which an electrode active material is applied and dried; at least one first slitting unit 200 that receives the electrode sheet A0 from the unwinder unit 100 and performs a primary cut on the electrode sheet A0 to form a plurality of first unit electrode sheets A1; at least one second slitting unit 300 that receives the first unit electrode sheet A1 from the first slitting unit 200 and performs a secondary cut on the first unit electrode sheet A1 to form a plurality of second unit electrode sheets A2; at least one rewinder unit 400 that receives the second unit electrode sheet A2 from the second slitting unit 300 and winds it up; and a frame unit 700 having a slitting space provided therein.

[0034] First, the unwinder unit 100 unwinds the electrode sheet A0 on which the electrode active material is applied and dried, and may have various configurations. In this case, the electrode sheet A0 on which the electrode active material is applied and dried may be understood in the art as a coated electrode sheet A0 after a coating process is completed, and the electrode sheet A0 may be a positive electrode or a negative electrode.

[0035] Specifically, the unwinder unit 100 may include at least one unwinder roller 120 for unwinding the electrode sheet A0, and a main body 110 for rotatably supporting the unwinder roller 120.

[0036] Here, the unwinder roller 120 may supply the electrode sheet A0, which is coated with an electrode active material, dried, and wound into a roll, to a first slitting unit 200 described later by unwinding the electrode sheet A0 through rotation.

[0037] In this case, the unwinder roller 120 can rotate at the same speed in synchronization with the rewinder roller 420 described below, so that the electrode sheet A0, the first unit electrode sheet A1, and the second unit electrode sheet A2 may be continuously transported on the secondary battery manufacturing apparatus 1.

[0038] Meanwhile, the electrode sheet A0 unwound from the unwinder unit 100 may be transferred to the first slitting unit 200 and cut by the first slitting unit 200. In this case, the electrode sheet A0 may be transferred to the first slitting unit 200 by a plurality of rollers as shown in FIG 1.

[0039] Here, the first slitting unit 200 is provided inside a frame unit 700 described below, and when the unwinder unit 100 described above is provided outside the frame unit 700, the electrode sheet A0 may be inserted from the outside to the inside of the frame unit 700. In this case, some of the rollers may be rotatably supported by a roll support unit 10, and the height of the roll support unit 10 (height in the Z direction in FIG. 1) may be set to correspond to the height of the frame unit 700 (height in the Z direction in FIG. 1).

[0040] 2, the first slitting unit 200 may receive the electrode sheet A0 from the unwinder unit 100 and perform a primary cut on the electrode sheet A0. At this time, it should be noted that the electrode sheet A0 passing through the inside of the first slitting unit 200 is indicated by a dotted line.

[0041] The first slitting unit 200 may include at least one cutter (not shown) for cutting the electrode sheet A0. The first slitting unit 200 may cut the electrode sheet A0 with the cutter to form a plurality of first unit electrode sheets A1.

[0042] At this time, the first unit electrode sheets A1 formed in a plurality of portions may move in different directions. For example, the first unit electrode sheets A1 may move from the first slitting portion 200 toward a pair of pillar portions 720, which will be described later, while branching out from each other. Here, the first unit electrode sheet A1 may be understood as an electrode having a width smaller than that of the electrode sheet A0.

[0043] 2, the first slitting unit 200 may be installed in an internal slitting space of a frame unit 700, which will be described later. More specifically, the first slitting unit 200 may be installed in a wall unit 730 of the frame unit 700.

[0044] Meanwhile, the first unit electrode sheet A1 formed by the first slitting unit 200 may be supplied to the second slitting unit 300.

[0045] Specifically, the second slitting unit 300 may receive the first unit electrode sheet A1 from the first slitting unit 200 and perform a second cutting of the first unit electrode sheet A1. At this time, it should be noted that the first unit electrode sheet A1 passing through the inside of the second slitting unit 300 is indicated by a dotted line.

[0046] The second slitting unit 300 may include at least one cutter (not shown) for cutting the first unit electrode sheet A1. The second slitting unit 300 may cut the first unit electrode sheet A1 to form a plurality of second unit electrode sheets A2. Here, the second unit electrode sheet A2 may be understood as an electrode sheet having a width smaller than that of the first unit electrode sheet A1.

[0047] The second slitting unit 300 may be provided in an internal slitting space of a frame unit 700, which will be described later. In this case, the second slitting unit 300 may be installed in a wall unit 730 of the frame unit 700.

[0048] Meanwhile, the second unit electrode sheet A2 formed by the second slitting unit 300 may be wound by the rewinder unit 400.

[0049] Here, the rewinder unit 400 is configured to wind up the second unit electrode sheet A2 supplied from the second slitting unit 300, and may have various configurations.

[0050] The rewinder unit 400 may include at least one rewinder roller 420 for winding the second unit electrode sheet A2, and a main body 410 for rotatably supporting the rewinder roller 420.

[0051] Here, the rewinder roller 420 is configured to wind up the second unit electrode sheet A2 by rotating so that the second unit electrode sheet A2 is wound into a roll, and may rotate at the same speed as the unwinder roller 120 described above in synchronization with each other.

[0052] The rewinder unit 400 may be installed on a frame unit 700, which will be described later. More specifically, a plurality of rewinder units 400 may be provided and fixedly installed to face each other on the pair of pillar units 720. In this case, when a plurality of rewinder units 400 are installed on one pillar unit 720, the rewinder units 400 may be installed side by side in the vertical direction (Z direction in FIG. 2) on one pillar unit 720.

[0053] Meanwhile, the first slitting unit 200, the second slitting unit 300, and the rewinder unit 400 may be provided inside the frame unit 700. Here, the frame unit 700 has a slitting space provided therein, and may have various configurations.

[0054] For example, the frame portion 700 may include a bottom portion 710; a pair of pillar portions 720 extending upward from the bottom portion 710; a wall portion 730 coupled to the sides of the pair of pillar portions 720; a cover portion 740 coupled to the upper surfaces of the pair of pillar portions 720; and a cover portion 740 having an input hole 700a formed therein through which the electrode sheet is input into the slitting space.

[0055] Here, the bottom portion 710 is a portion of the frame portion 700 that is provided so as to come into contact with the ground, and may be understood as a configuration that supports a pair of pillar portions 720, which will be described later.

[0056] The pillars 720 may have various configurations and are formed to extend upward from the bottom 710. Specifically, the pillars 720 may be provided in a pair and may be formed to extend upward from both ends of the bottom 710 (in the Z direction in FIG. 2) in a longitudinal direction.

[0057] Meanwhile, a wall portion 730 may be coupled to a side surface of the pair of pillar portions 720. In this case, the wall portion 730 may have a plate shape and may be provided to be coupled to the side surface of the pillar portion (a surface positioned in a direction perpendicular to the reference XZ plane in FIG. 2) so that the frame portion 700 forms a slitting space therein.

[0058] 2, the first slitting unit 200 and the second slitting unit 300 may be fixed to the wall 730. Also, the second position correction unit 600, which will be described later, may be fixed to the wall 730.

[0059] In addition, the cover 740 has an input hole 700a through which the electrode sheet is input into the slitting space, and may have various configurations.

[0060] Specifically, the cover part 740 may be provided to be coupled to upper surfaces (surfaces positioned in the Z direction in FIG. 2) of the pair of pillar parts 720 so that the frame part 700 forms a slitting space therein.

[0061] Here, the input hole 700a is a through-hole penetrating the inside and outside of the cover 740, and may be located in either of the cover 740. For example, the input hole 700a may be located in the center of the cover 740. At this time, it should be noted that the input hole 700a is indicated by a dotted line in Figs. 1 and 2.

[0062] Meanwhile, the electrode sheet A0 may be misaligned during the process of being moved for the first slitting. If the electrode sheet A0 is slit in a state where it is misaligned, the width of the first unit electrode sheet A1 formed may be non-uniform, which may cause a defective finished product.

[0063] Therefore, the present invention may further include at least one first position correcting unit 500 for correcting a positional deviation that occurs during a transport process before the electrode sheet A0 is input into the first slitting unit 200.

[0064] Specifically, the first position correcting unit 500 may be provided on a moving path of the electrode sheet A0, and may sense the position of the electrode sheet A0 to correct the position of the electrode sheet A0.

[0065] The first position correcting unit 500 may be attached to the frame unit 700. More specifically, the first position correcting unit 500 may be attached to the frame unit 700 so as to be disposed adjacent to the input hole 700a of the frame unit 700. In this case, a first position detecting unit 520 and the first position adjusting unit 530, which will be described later, may be provided to face each other across the input hole 700a.

[0066] The first position correcting unit 500 may include a first position detecting unit 520 that detects the position of the electrode sheet A0, and a first position adjusting unit 530 that adjusts the position of the electrode sheet A0 based on position information of the electrode sheet A0 acquired from the first position detecting unit 520. In this case, the first position detecting unit 520 and the first position adjusting unit 530 may be fixedly supported by a main body 510.

[0067] Specifically, the first position detector 520 is configured to detect the position of the electrode sheet A0 and may have various configurations. For example, the first position detector 520 may include a Line Position Control (LPC) sensor. In this case, the first position detector 520 may detect the position where the electrode active material is applied on the electrode sheet A0, i.e., the electrode active material application line, to obtain position information of the electrode sheet A0.

[0068] The first position adjusting unit 530 adjusts the position of the electrode sheet A0 based on the position information of the electrode sheet A0 obtained from the first position detecting unit 520, and may have various configurations.

[0069] For example, the first position adjustment unit 530 may include a pivot roller. The pivot roller may be moved in a width direction of the electrode sheet A0 (a direction perpendicular to the reference XZ plane in FIG. 2). At this time, the movement of the first position adjustment unit 530 may be controlled by a control unit (not shown).

[0070] Here, the control unit (not shown) can receive the position value of the electrode sheet A0 from the first position detection unit 520 and control the position of the first position adjustment unit 530 by comparing information on the preset position value of the electrode sheet A0 with the received position information of the electrode sheet A0.

[0071] Meanwhile, the above-mentioned first unit electrode sheet A1 may also be misaligned during the process of being moved for the second slitting. In this case, if the first unit electrode sheet A1 is slit in a state in which the first unit electrode sheet A1 is misaligned, the width of the formed second unit electrode sheet A2 may be non-uniform, which may cause a defective finished product.

[0072] Therefore, the present invention may further include at least one second position correcting unit 600 for correcting the position of the first unit electrode sheet A1 to prevent misalignment of the first unit electrode sheet A1 before the first unit electrode sheet A1 is secondly slit by the second slitting unit 300.

[0073] Specifically, the second position correcting unit 600 is provided between the first slitting unit 200 and the second slitting unit 300; and may sense the position of the first unit electrode sheet A1 and correct the position of the first unit electrode sheet A1. The second position correcting unit 600 may be attached to a wall unit 730 of the frame unit 700. In this case, it is preferable that the second position correcting unit 600 is provided in a number corresponding to the number of first unit electrode sheets A1 cut and formed from the first slitting unit 200.

[0074] The second position correcting unit 600 may include a second position detecting unit 620 detecting a position of the first unit electrode sheet A1 and a second position adjusting unit 630 adjusting a position of the first unit electrode sheet A1 based on position information of the first unit electrode sheet A1 acquired from the second position detecting unit 620. In this case, the second position detecting unit 620 and the second position adjusting unit 630 may be fixedly supported by a main body 610.

[0075] Specifically, the second position detector 620 is configured to detect the position of the first unit electrode sheet A1 and may have various configurations. For example, the second position detector 620 may include a Line Position Control (LPC) sensor. In this case, the second position detector 620 may detect the position where the electrode active material is applied on the first unit electrode sheet A1, i.e., the electrode active material application line, to obtain position information of the first unit electrode sheet A1.

[0076] The second position adjusting unit 630 is configured to adjust the position of the first unit electrode sheet A1 based on the position information of the first unit electrode sheet A1 obtained from the second position detecting unit 620, and may be configured in various ways.

[0077] For example, the second position adjustment unit 630 may include a pivot roller. The pivot roller may be moved in a width direction of the first unit electrode sheet A1 (a direction perpendicular to the reference XZ plane in FIG. 2). In this case, the movement of the second position adjustment unit 630 may be controlled by a control unit (not shown).

[0078] Here, the control unit can receive the position value of the first unit electrode sheet A1 from the second position detection unit 620 and control the position of the second position adjustment unit 630 by comparing the received position value of the first unit electrode sheet A1 with a preset position value of the first unit electrode sheet A1.

[0079] Secondary battery manufacturing method The present invention may include an unwinding step (S10) of unwinding an electrode sheet A0 on which an electrode active material is applied and dried; a first slitting step (S30) of primarily cutting the electrode sheet A0 to form a plurality of first unit electrode sheets A1 after the unwinding step (S10); a second slitting step (S50) of secondly cutting the first unit electrode sheet A1 to form a plurality of second unit electrode sheets A2 after the first slitting step (S30); and a rewinding step (S60) of winding up the second unit electrode sheet A2 after the second slitting step (S50). In this case, the unwinding step (S10), the first slitting step (S30), the second slitting step (S50), and the rewinding step (S60) may be performed consecutively.

[0080] Here, the unwinding step (S10) is a step of unwinding the electrode sheet A0 on which the electrode active material is applied and dried, and may be performed in various ways.

[0081] First, the unwinding step (S10) is a step of unwinding the electrode sheet A0 on which the electrode active material is applied and dried, and may be performed in various ways. In this case, the electrode sheet A0 on which the electrode active material is applied and dried is preferably understood in the art as a coated electrode sheet A0 after a coating process is completed.

[0082] The unwinding step (S10) may be performed by unwinding the electrode sheet A0 by an unwinder unit 100, and a detailed description of the unwinder unit 100 may be substituted for that described above.

[0083] Meanwhile, after the unwinding step (S10), a first slitting step (S30) may be performed to primarily cut the electrode sheet A0.

[0084] Here, the first slitting step (S30) is a step of primarily cutting the electrode sheet A0 to form a plurality of first unit electrode sheets A1, and may be performed in various ways.

[0085] Specifically, in the first slitting step (S30), the electrode sheet A0 may be cut in a direction parallel to a transport direction (Z direction in FIG. 2) of the electrode sheet A0 to form a plurality of first unit electrode sheets A1, the width of which may be set to various values.

[0086] In the first slitting step (S30), the electrode sheet A0 may be cut by the above-described first slitting unit 200. Here, more detailed information regarding the first slitting unit 200 may be substituted for the above-described information.

[0087] After the first slitting step (S30), a second slitting step (S50) may be performed to secondarily cut the first unit electrode sheet A1.

[0088] The second slitting step (S50), which is a step of secondarily cutting the first unit electrode sheet A1 after the first slitting step (S30) to form a plurality of second unit electrode sheets A2, may be performed in various ways.

[0089] Here, the second slitting step (S50) is a step of primarily cutting the first unit electrode sheet A1 to form a plurality of second unit electrode sheets A2, and may be performed in various ways.

[0090] Specifically, in the second slitting step (S50), the first unit electrode sheet A1 may be cut in a direction parallel to a moving direction (X direction in FIG. 2) of the first unit electrode sheet A1 to form a plurality of second unit electrode sheets A2, where the width of the second unit electrode sheet A2 may be set to various values.

[0091] In the second slitting step (S50), the first unit electrode sheet A1 may be cut by the above-mentioned second slitting unit 300. Here, more detailed information regarding the second slitting unit 300 may be substituted for the above-mentioned information.

[0092] After the second slitting step (S50), a rewinding step (S60) of winding up the second unit electrode sheet A2 may be performed.

[0093] Here, the rewinding step (S60) is a step of winding the second unit electrode sheet A2 after the second slitting step (S50), and may be performed in various ways. Specifically, the rewinding step (S60) may be performed by winding the second unit electrode sheet A2 by a rewinder unit 400, and a detailed description of the rewinder unit 400 may be substituted for the above description.

[0094] Meanwhile, the present invention may further include a first position correcting step (S20) of correcting the position of the electrode sheet A0 between the unwinding step (S10) and the first slitting step (S30).

[0095] Specifically, the first position correcting step (S20) is a step of detecting position information of the electrode sheet A0 through the first position correcting unit 500 and correcting the position of the electrode sheet A0 based on the position information of the electrode sheet A0, and may be performed in various ways. Here, a detailed description of the first position correcting unit 500 may be substituted for the above description.

[0096] Also, the present invention may further include a second position correcting step (S40) of correcting the position of the first unit electrode sheet A1 between the first slitting step (S30) and the second slitting step (S50).

[0097] Specifically, the second position correcting step (S40) is a step of detecting position information of the first unit electrode sheet A1 through the second position correcting unit 600 and correcting the position of the first unit electrode sheet A1 based on the position information of the first unit electrode sheet A1, and may be performed in various ways. Here, a detailed description of the second position correcting unit 600 may be substituted for the above description.

[0098] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the technical spirit of the present invention and the equivalent scope of the claims described below by a person having ordinary knowledge in the technical field to which the present invention pertains. [Explanation of symbols]

[0099] 10 Roll support part 100 Unwinder section 110 Main unit 120 Unwinder roller 200 First Slitting Section 300 Second Slitting Section 400 Rewinder 410 Main unit 420 Rewinder Roller 500 1st position correction section 510 Main unit 520 1st position sensing section 530 1st position adjustment section 600 2nd position correction section 610 Main unit 620 2nd position sensing section 630 Second position adjustment section 700 Frame section 700a Insertion hole 710 Bottom 720 Column section 730 Wall section 740 Lid S10 Unwinding stage S20 First position correction step S30 1st slitting stage S40 Second position correction step S50 2nd slitting stage S60 Rewinding Stage A0 electrode sheet A1 First unit electrode sheet A2 Second unit electrode sheet

Claims

1. At least one unwinder unit that unwinds the electrode sheet on which the electrode active material is applied and dried; at least one first slitting unit receiving the electrode sheet from the unwinder unit and performing a primary cutting on the electrode sheet to form a plurality of first unit electrode sheets; at least one second slitting unit receiving the first unit electrode sheet from the first slitting unit and secondarily cutting the first unit electrode sheet to form a plurality of second unit electrode sheets; at least one rewinder unit receiving and winding the second unit electrode sheet from the second slitting unit; A frame portion having a slitting space therein, The first slitting unit and the second slitting unit are installed on the frame unit.

2. A moving path of the electrode sheet is provided, The apparatus of claim 1 , further comprising at least one first position correcting unit that senses a position of the electrode sheet and corrects the position of the electrode sheet.

3. The secondary battery manufacturing apparatus according to claim 2 , wherein the first position correction unit is attached to the frame unit.

4. The first position correction unit is a first position detector for detecting a position of the electrode sheet; The apparatus of claim 2 , further comprising: a first position adjusting unit that adjusts a position of the electrode sheet based on the position information of the electrode sheet obtained from the first position detecting unit.

5. The apparatus of claim 4 , wherein the first position detector comprises an LPC sensor.

6. The apparatus of claim 4 , wherein the first position adjustment unit includes a pivot roller.

7. provided between the first slitting portion and the second slitting portion, 3. The apparatus of claim 1, further comprising at least one second position correcting unit that senses a position of the first unit electrode sheet and corrects the position of the first unit electrode sheet.

8. The apparatus of claim 7 , wherein the second position correction unit is provided in a number corresponding to the number of first unit electrode sheets cut from the first slitting unit.

9. The second position correction unit is a second position detector configured to detect a position of the first unit electrode sheet; 8. The apparatus of claim 7, further comprising: a second position adjusting unit that adjusts positions of the first unit electrode sheets based on position information of the first unit electrode sheets obtained from the second position sensing unit.

10. The apparatus of claim 9 , wherein the second position detector comprises an LPC sensor.

11. The secondary battery manufacturing apparatus according to claim 9 , wherein the second position adjustment unit includes a pivot roller.

12. The frame portion is The bottom and A pair of pillars extending upward from the bottom; A wall portion coupled to side surfaces of the pair of columns; The apparatus of claim 1 , further comprising: a cover portion coupled to upper surfaces of the pair of columns, the cover portion having an input hole through which the electrode sheet is input into the slitting space.

13. The first unit electrode sheets are branched and moved from the first slitting portion toward the pair of pillar portions, The secondary battery manufacturing apparatus according to claim 12 , wherein the rewinder unit is provided in a plurality of units and fixedly installed on the pair of pillars so as to face each other.

14. The secondary battery manufacturing apparatus according to claim 12 , wherein the first slitting portion and the second slitting portion are fixed to the wall portion.

15. an unwinding step of unwinding the electrode sheet on which the electrode active material is applied and dried; a first slitting step of primarily cutting the electrode sheet after the unwinding step to form a plurality of first unit electrode sheets; a second slitting step of secondarily cutting the first unit electrode sheet to form a plurality of second unit electrode sheets after the first slitting step; a rewinding step of winding up the second unit electrode sheet after the second slitting step, The unwinding, the first slitting, the second slitting, and the rewinding are performed consecutively.

16. Between the unwinding step and the first slitting step, The method of claim 15, further comprising a first position correcting step of detecting a position of the electrode sheet and correcting the position of the electrode sheet.

17. Between the first slitting step and the second slitting step, The method of claim 15, further comprising a second position correcting step of detecting a position of the first unit electrode sheet and correcting the position of the first unit electrode sheet.

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