Patent Publication Number: US-2023155101-A1

Title: Method for Manufacturing Secondary Battery and Apparatus for Manufacturing Secondary Battery

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims the benefit of the priority of Korean Patent Application No. 10-2020-0065215, filed on May 29, 2020, which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The present invention relates to a method for manufacturing a secondary battery and an apparatus for manufacturing a secondary battery. 
     BACKGROUND ART 
     Secondary batteries are rechargeable unlike primarily batteries, and also, the possibility of compact size and high capacity is high. Thus, recently, many studies on secondary batteries are being carried out. As technology development and demands for mobile devices increase, the demands for secondary batteries as energy sources are rapidly increasing. 
     Rechargeable batteries are classified into coin type batteries, cylindrical type batteries, prismatic type batteries, and pouch type batteries according to a shape of a battery case. In such a secondary battery, an electrode assembly mounted in a battery case is a chargeable and dischargeable power generating device having a structure in which an electrode and a separator are stacked. 
     The electrode assembly may be approximately classified into a jelly roll type electrode assembly in which a separator is interposed between a positive electrode and a negative electrode, each of which is provided as the form of a sheet coated with an active material, and then, the positive electrode, the separator, and the negative electrode are wound, a stacked type electrode assembly in which a plurality of positive and negative electrodes with a separator therebetween are sequentially stacked, and a stack/folding type electrode assembly in which stacked type unit cells are wound together with a separation film having a long length. 
     According to the related art, a notching process of the electrode is performed through a mold press. Here, in the case of the mold press, a shape is not changed in the notching unless the mold is exchanged, and when the electrode is determined as being defective before the notching process, an operation of the device may be stopped to display the defect by a person. Thereafter, even after the notching process, a production rate is reduced to be displayed and processed so as to display the defect. Thus, there is a problem in that manufacturing productivity is lowered. 
     [Prior Art Document] (Patent Document) Korean Patent Publication No. 10-2014-0015647 
     DISCLOSURE OF THE INVENTION 
     Technical Problem 
     One aspect of the present invention is to provide a method for manufacturing a secondary battery, which is capable of improving manufacturing productivity by enabling a continuous operation without moving equipment during manufacturing the secondary battery, and an apparatus for manufacturing a secondary battery. 
     Technical Solution 
     A method for manufacturing a secondary battery according to an embodiment of the present invention comprises: an electrode supply process of supplying an electrode through an electrode supply part; a first inspection process of detecting the supplied electrode to distinguish a normal electrode portion and an abnormal electrode portion through the first inspection part; and a notching process of notching the electrode, which is subjected to the first inspection process, in the notching part, wherein the notching process perform the notching through a laser so that the normal electrode portion and the abnormal electrode portion, which are detected in the first inspection process, are divided from each other. 
     In addition, an apparatus for manufacturing a secondary battery according to an embodiment of the present invention comprises: an electrode supply part configured to supply an electrode; a first inspection part configured to detect the supplied electrode so as to distinguish a normal electrode portion and an abnormal electrode portion from each other; and a notching part configured to notch the electrode passing through the first inspection part, wherein the notching part notches the electrode through a laser so that the normal electrode portion and the abnormal electrode portion, which are detected in the first inspection part, are divided from each other. 
     Advantageous Effects 
     According to the present invention, the normal electrode portion and the abnormal electrode portion of the electrode may be notched into different shapes through the laser to perform the continuous operation without moving the equipment, thereby improving the manufacturing productivity. Thereafter, when the plurality of cells comprising the notched electrode are manufactured, the defective cell comprising the abnormal electrode portion that is notched as the abnormal electrode portion may be detected and discharged to perform the continuous operation without moving the equipment, thereby significantly improving the manufacturing productivity. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a front view illustrating an example of an apparatus for manufacturing a secondary battery according to an embodiment of the present invention. 
         FIG.  2    is a perspective view illustrating a first inspection process and a notching process in a method for manufacturing a secondary battery according to an embodiment of the present invention. 
         FIG.  3    is a front view illustrating an example of an apparatus for manufacturing a secondary battery according to another embodiment of the present invention. 
         FIG.  4    is a perspective view illustrating a first inspection process and a notching process in a method for manufacturing a secondary battery according to another embodiment of the present invention. 
         FIG.  5    is a perspective view illustrating a second inspection process, a cell cutting process, and a discharge process in the method for manufacturing the secondary battery according to another embodiment of the present invention. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. It should be noted that the reference numerals are added to the components of the drawings in the present specification with the same numerals as possible, even if they are illustrated in other drawings. Also, the present invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. In the following description of the present invention, the detailed descriptions of related arts which may unnecessarily obscure the gist of the present invention will be omitted. 
     Method for Manufacturing Secondary Battery According to an Embodiment 
       FIG.  1    is a front view illustrating an example of an apparatus for manufacturing a secondary battery according to an embodiment of the present invention, and  FIG.  2    is a perspective view illustrating a first inspection process and a notching process in a method for manufacturing a secondary battery according to an embodiment of the present invention. 
     Referring to  FIGS.  1  and  2   , a method for manufacturing a secondary battery according to an embodiment of the present invention comprises an electrode supply process of supplying an electrode  10 , a first inspection process of detecting the electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other in a first inspection part V 1 , and a notching process of notching the electrode at a notching part  130 . 
     In addition, the method for manufacturing the secondary battery according to an embodiment of the present invention may further comprise a winding process of winding the notched electrode  10  around an electrode winding part  140 . 
     In more detail, referring to  FIG.  1   , in the electrode supply process, the electrode  10  may be supplied through the electrode supply part  110 . Here, the electrode supply part  110  comprises an electrode supply roll  111  on which the electrode  10  is wound. In the electrode supply process, the electrode  10  wound around the electrode supply roll  111  may be unwound to supply the electrode  10  to a position for the subsequent process. Here, the electrode  10  may be wound around the electrode supply roll  111  in various forms such as a sheet or film shape. 
     In the electrode supply process, a supply speed of the electrode  10  may be adjusted according to a speed of the notching performed in the notching process. 
     In the electrode supply process, the electrode supply part  110  may comprise a rollers R for supplying the electrode. Here, a rotation speed of each of the rollers R may be adjusted to adjust a supply rate. 
     In the first inspection process, the first inspection part V 1  detects the supplied electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other. 
     In addition, in the first inspection process, the first inspection part V 1  may divide the normal electrode portion from the abnormal electrode portion through a vision sensor and may transmit a notching signal to the notching part  130  through a main control system  120 . Here, the main control system  120  may transmit a notch-type signal together when the notching signal is transmitted to the notching part  130 . In this case, the method for manufacturing the secondary battery according to an embodiment of the present invention may further comprise a control process of controlling the notching part  130  in the main control system  120  to adjust a notched shape of the electrode  10 . 
     In addition, in the first inspection process, for example, the first inspection part V 1  senses a defective electrode display tag (NG Tag) T attached to a defective portion of the electrode  10  to detect the normal electrode portion and the abnormal electrode portion. In the first inspection process, for another example, the second inspection part V 2  may sense a shape of the electrode  10  to detect the normal electrode portion and the abnormal electrode portion. Here, the normal electrode portion and the abnormal electrode portion may be detected by sensing a width dimension, distortion, an applied state of an active material, etc., in the electrode  10 . 
     In the notching process, the electrode  10  that is subjected to the first inspection process may be notched in the notching part  130 . 
     In addition, in the notching process, the notching may be performed by irradiating laser light B to the electrode  10  through a laser  131  so that the normal electrode portion and the abnormal electrode portion, which are detected in the first inspection process, are divided from each other. 
     Furthermore, in the notching process, the notching part  130  may notch the normal electrode portion and the abnormal electrode portion, which are distinguished from each other in the first inspection part V 1 , in different shapes based on the received notching signal. 
     In the notching process, the normal electrode portion is notched to form an electrode tab  11 , and the abnormal electrode portion is notched in at least one shape among a marked shape, a shape having a hole, among a shape of a cut electrode tab  11 ′. Here, in the notching process, the notching part  130  irradiates the laser light B to a side end of the abnormal electrode portion in the electrode  10  through the laser  131  to notch the abnormal electrode portion so that the shape of the electrode tab  11  at the abnormal electrode portion is different from that of the electrode tab  11  at the normal electrode portion. Here, in more detail, the notched shape of the abnormal electrode portion may have a shape, in which an electrode tab  11 ′ having a rectangular shape, in which a portion at which the electrode tab  11 ′ is to be formed is short, is cut, a shape, in which an edge of a portion at which an electrode tab  11 ″ is to be formed is chamfered, a marked shape in which a pattern is formed, or a shape in which a circular or polygonal hole is formed. 
     In the winding process, the notched electrode  10  may be wound around the electrode winding part  140 . Here, the electrode winding part  140  may comprise an electrode winding roll  141 , on which the electrode  10  is wound, to wind the electrode  10  moved in the winding process around the electrode winding roll  141 . 
     Referring to  FIGS.  1  and  2   , in the method for manufacturing the secondary battery, which has the above-described configuration, according to an embodiment of the present invention, the normal electrode portion and the abnormal electrode portion in the supplied electrode  10  may be distinguished from each other through the first inspection part V 1  and then be notched in different shapes through the laser  131  to perform a continuous process without moving equipment, thereby improving manufacturing productivity. 
     Method for Manufacturing Secondary Battery According to Another Embodiment 
     Hereinafter, a method for manufacturing a secondary battery according to another embodiment of the present invention will be described. 
       FIG.  3    is a front view illustrating an example of an apparatus for manufacturing a secondary battery according to another embodiment of the present invention,  FIG.  4    is a perspective view illustrating a first inspection process and a notching process in a method for manufacturing a secondary battery according to another embodiment of the present invention, and  FIG.  5    is a perspective view illustrating a second inspection process, a cell cutting process, and a discharge process in the method for manufacturing the secondary battery according to another embodiment of the present invention. 
     Referring to  FIGS.  3  and  5   , a method for manufacturing a secondary battery according to another embodiment of the present invention comprises an electrode supply process of supplying an electrode  10 , a first inspection process of detecting the electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other in a first inspection part V 1 , and a notching process of notching the electrode  10  at a notching part  130 . In addition, in the method for manufacturing the secondary battery according to another embodiment of the present invention may further comprise, after the notching process, a lamination process of laminating an electrode  10  and a separator  20 , a second inspection process of an electrode portion notched as the abnormal electrode portion through a second inspection part V 2 , a cell cutting process of cutting the electrode portion into a plurality of cells  30 , and a discharge process of discharging a defective cell  30 ′ comprising the abnormal electrode portion. 
     The method for manufacturing the secondary battery according to another embodiment of the present invention is different from the method for manufacturing the secondary battery according to the foregoing embodiment of the present invention in that the method for manufacturing the secondary battery according to another embodiment of the present invention further comprises the lamination process, the second inspection process, the cell cutting process, and the discharge process. Thus, in descriptions of the method for manufacturing the secondary battery according to another embodiment of the present invention, contents duplicated with the method for manufacturing the secondary battery according to the forgoing embodiment of the present invention will be omitted or briefly described, and also, differences therebetween will be mainly described. 
     In more detail, referring to  FIGS.  3  to  5   , in the electrode supply process, the electrode  10  may be supplied through the electrode supply part  110 . 
     In the electrode supply process, a supply speed of the electrode  10  may be adjusted according to a speed of the notching performed in the notching process. 
     In the electrode supply process, the electrode supply part  110  may comprise a rollers R supplying the electrode  10 . Here, a rotation speed of each of the rollers R may be adjusted to adjust a supply rate. 
     In the first inspection process, the first inspection part V 1  detects the supplied electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other. 
     In the first inspection process, the first inspection part V 1  may divide the normal electrode portion from the abnormal electrode portion through a vision sensor and may transmit a notching signal to the notching part  130  through a main control system  220 . 
     In the notching process, the electrode  10  that is subjected to the first inspection process may be notched in the notching part  130 . 
     In addition, in the notching process, the normal electrode portion and the abnormal electrode portion, which are detected in the first inspection process, may be notched through a laser  131  so as to be divided from each other. 
     Furthermore, in the notching process, the notching part  130  may notch the normal electrode portion and the abnormal electrode portion, which are distinguished from each other in the first inspection part V 1 , in different shapes based on the received notching signal. 
     In the notching process, the normal electrode portion is notched to form an electrode tab  11 , and the abnormal electrode portion is notched in the form of at least one of a marked shape, a shape having a hole, or a shape of a cut electrode tab  11 ′. Here, in the notching process, the notching part  130  may irradiate the laser light B to a side end of the abnormal electrode portion in the electrode  10  through the laser  131  to notch the abnormal electrode portion so that the shape of the electrode tab  11  at the abnormal electrode portion is different from that of the electrode tab  11  at the normal electrode portion. Here, in more detail, the notched shape of the abnormal electrode portion may have a shape, in which an electrode tab  11 ′ having a rectangular shape, in which a portion at which the electrode tab  11 ′ is to be formed is short, is cut, a shape, in which an edge of a portion at which an electrode tab  11 ″ is to be formed is chamfered, a marked shape in which a pattern is formed, or a shape in which a circular or polygonal hole is formed. 
     In the lamination process, after the notching process, the electrode  10  and the separator  20  may be alternately stacked to be laminated. Here, in the lamination process, heat and a pressure are applied to a stack S of the notched electrode  10  and the separator  20 , and thus, the electrode and the separator  20  may be bonded to each other through the lamination part  260 . 
     Here, the separator  20  wound around the separator supply roll  250  may be unwound to supply the separator  20  to the lamination part  260 . 
     In the second inspection process, the second inspection part V 2  may detect an electrode portion notched as the abnormal electrode portion after the lamination process. Here, in the second inspection process, a cut electrode tab  11 ′, a mark, or a hole of the electrode portion notched as the abnormal electrode portion may be sensed through the second inspection part V 2  comprising a vision sensor to detect the abnormal electrode portion, thereby transmitting a detection signal to a discharge part  280 . 
     In the cell cutting process, after the second inspection process, the stack S of the electrode  10  and the separator  20 , which are laminated, may be cut into a plurality of cells  30 . Here, in the cell cutting process, the stack S of the electrode  10  and the separator  20 , which is disposed between a pair of cutters, may be cut through a cell cutting part  270  comprising the pair of cutters. 
     In this case, the cut cells  30  may be transferred to a subsequent process through conveyor belts C 1  and C 2 . 
     In the discharge process, after the cutting process, the discharge part  280  may discharge defective cell  30 ′ comprising the abnormal electrode portion detected through the second inspection process from the plurality of cells  30 . Here, in the discharge process, the defective cell  30 ′ comprising the abnormal electrode portion may be gripped through the discharge part  280  comprising a jig to separate the defective cell  30 ′ from the cells comprising the normal electrode portion. 
     In the method for manufacturing the secondary battery according to another embodiment of the present invention configured as described above, the normal electrode portion and the abnormal electrode portion of the electrode  10  may be notched in different shapes through the laser  131 , and then, the defective cell  30 ′ comprising the abnormal electrode portion, which is notched as the abnormal electrode portion, may be detected in the subsequent inspection process and then discharged in the discharge process. Therefore, a continuous operate may be possible without moving the equipment to significantly improve manufacturing productivity. 
     Apparatus for Manufacturing Secondary Battery According to an Embodiment 
     Hereinafter, an apparatus for manufacturing a secondary battery according to an embodiment of the present invention will be described. 
     Referring to  FIGS.  1  and  2   , an apparatus  100  for manufacturing a secondary battery according to an embodiment of the present invention comprises an electrode supply part  110  supplying an electrode  10 , a first inspection part V 1  detecting the supplied electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other, a notching part  130  notching the electrode  10  passing through the first inspection part V 1 , and a main control system  120  receiving a notching signal from the first inspection part V 1  to transmit the notching signal to the notching part  130 . In addition, the apparatus  100  for manufacturing the secondary battery according to an embodiment of the present invention may further comprise an electrode winding part  140  winding the electrode  10 . 
     The apparatus  100  for manufacturing the secondary battery according to an embodiment of the present invention relates to an apparatus for manufacturing the secondary battery applied to the method for manufacturing the secondary battery according to the forgoing embodiment and another embodiment of the present invention. 
     Therefore, in descriptions of the apparatus  100  for manufacturing the secondary battery according to this embodiment, contents duplicated with those of the apparatus according to the forgoing embodiment and another embodiment of the prevent invention will be omitted or briefly described, and differences will be mainly described. 
     In more detail, an electrode supply part  110  may supply an electrode  10 . Here, the electrode supply part  110  comprises an electrode supply roll  111  on which the electrode  10  is wound, and the electrode  10  wound around the electrode supply roll  111  may be unwound to supply the electrode  10  to a position for the subsequent process. 
     Also, the electrode supply part  110  may adjust a supply rate of the electrode  10  according to a notching speed performed by a notching part  130 . Here, the electrode supply part  110  may comprise a rollers R supplying the electrode  10 . Here, a rotation speed of each of the rollers R may be adjusted to adjust the supply rate. 
     The first inspection part V 1  may detect the supplied electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other. 
     In addition, the first inspection part V 1  may transmit a notching signal by dividing the normal electrode portion and the abnormal electrode portion through a vision sensor. 
     For example, the first inspection part V 1  senses a defective electrode display tag (NG Tag) T attached to a defective portion of the electrode  10  to detect the normal electrode portion and the abnormal electrode portion. 
     For another example, a second inspection part V 2  may sense a shape of the electrode  10  to detect the normal electrode portion and the abnormal electrode portion. Here, the normal electrode portion and the abnormal electrode portion may be detected by sensing a width dimension, distortion, an applied state of an active material, etc., in the electrode  10 . 
     A main control system  120  may receive the notching signal from the first inspection part V 1  to transmit the notching signal to the notching part  130 . Here, the main control system  120  may transmit a notch-type signal together when the notching signal is transmitted to the notching part  130 . That is, the notched shape of the electrode  10  may be adjusted by controlling the notching part  130  in the main control system  120 . 
     The notching part  130  may notch the electrode  10  passing through the first inspection part V 1 . 
     In addition, the notching part  130  may notch the electrode  10  through a laser  131  so that the normal electrode portion and the abnormal electrode portion, which are detected in the first inspection part V 1 , are divided from each other. 
     Furthermore, the notching part  130  may notch the normal electrode portion and the abnormal electrode portion, which are distinguished from each other in the first inspection part V 1 , in different shapes based on the received notching signal. 
     In addition, the notching part  130  may notch the normal electrode portion to form an electrode tab  11 . Here, the notching part  130  may irradiate a laser beam B to a side end of the normal electrode portion through the laser  131  to form the rectangular electrode tab  11 . 
     In addition, the notching part  130  may notch the abnormal electrode portion in the form of at least one of a marked shape, a shape having a hole, or a shape of a cut electrode tab  11 ′. Here, the notching part  130  may irradiate the laser light B to a side end of the abnormal electrode portion in the electrode  10  through the laser  131  to notch the abnormal electrode portion so that the shape of the electrode tab  11  at the abnormal electrode portion is different from that of the electrode tab  11  at the normal electrode portion. Here, in more detail, the notched shape of the abnormal electrode portion may have a shape, in which an electrode tab  11 ′ having a rectangular shape, in which a portion at which the electrode tab  11 ′ is to be formed is short, is cut, a shape, in which an edge of a portion at which an electrode tab  11 ″ is to be formed is chamfered, a marked shape in which a pattern is formed, or a shape in which a circular or polygonal hole is formed. 
     An electrode winding part  140  may wind the notched electrode  10  passing through the notching part  130 . Here, the electrode winding part  140  may comprise an electrode winding roll  141 , on which the electrode  10  is wound, to wind the moving electrode  10  around the electrode winding roll  141 . 
     Apparatus for Manufacturing Secondary Battery According to Another Embodiment 
     Hereinafter, an apparatus for manufacturing a secondary battery according to another embodiment of the present invention will be described. 
     Referring to  FIGS.  3  to  5   , an apparatus  200  for manufacturing a secondary battery according to another embodiment of the present invention comprises an electrode supply part  110  supplying an electrode  10 , a first inspection part V 1  detecting the supplied electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other, a notching part  130  notching the electrode  10  passing through the first inspection part V 1 , a main control system  220  receiving a notching signal from the first inspection part V 1  to transmit the notching signal to the notching part  130 , a lamination part  260  laminating the notched electrode  10  and a separator  20 , a second inspection part V 2  detecting an electrode portion that is notched as the abnormal electrode portion, a cell cutting part  270  cutting a stack S of the electrode  10  and the separator into a plurality of cells  30 , and a discharge part  280  discharging a defective cell  30 ′ comprising the abnormal electrode portion. 
     The apparatus  200  for manufacturing the secondary battery according to another embodiment of the present invention is different from the apparatus for manufacturing the electrode assembly according to the foregoing embodiment of the present invention in that the apparatus  200  further comprises the lamination part  260 , the second inspection part V 2 , the cell cutting part  270 , and the discharge part  280 . 
     Therefore, in descriptions of the apparatus  200  for manufacturing the secondary battery according to this embodiment, contents duplicated with those of the apparatus according to the forgoing embodiment of the prevent invention will be omitted or briefly described, and differences will be mainly described. 
     In more detail, in more detail, the electrode supply part  110  may supply an electrode  10 . Here, the electrode supply part  110  comprises an electrode supply roll  111  on which the electrode  10  is wound, and the electrode  10  wound around the electrode supply roll  111  may be unwound to supply the electrode  10  to a position for the subsequent process. 
     Also, the electrode supply part  110  may adjust a supply rate of the electrode  10  according to a notching speed performed by a notching part  130 . Here, the electrode supply part  110  may comprise a rollers R supplying the electrode  10 . Here, a rotation speed of each of the rollers R may be adjusted to adjust the supply rate. 
     The first inspection part V 1  may detect the supplied electrode  10  to distinguish a normal electrode portion and an abnormal electrode portion from each other. 
     The first inspection part V 1  may transmit a notching signal by dividing the normal electrode portion and the abnormal electrode portion through a vision sensor. 
     The main control system  220  may receive the notching signal to transmit the notching signal to the notching part  130 . Here, the main control system  220  may transmit a notch-type signal together when the notching signal is transmitted to the notching part  130 . 
     The notching part  130  may notch the electrode  10  passing through the first inspection part V 1 . 
     In addition, the notching part  130  may notch the electrode through a laser  131  so that the normal electrode portion and the abnormal electrode portion, which are detected in the first inspection part V 1 , are divided from each other. 
     The notching part  130  may notch the normal electrode portion and the abnormal electrode portion, which are distinguished from each other in the first inspection part V 1 , in different shapes based on the received notching signal. 
     The notching part  130  may notch the normal electrode portion to form an electrode tab  11  and notch the abnormal electrode portion in the form of at least one of a marked shape, a shape having a hole, or a shape of a cut electrode tab  11 ′. 
     The lamination part  260  may alternately stack the notched electrode  10  and the separator  20  to laminate the electrode  10  and the separator  20 . Here, the lamination part  260  may press the stack S of the notched electrode  10  and the separator  20  while applying heat to bond the electrode  10  and the separator  20  to each other. 
     Here, the separator  20  wound around the separator supply roll  250  may be unwound to supply the separator  20  to the lamination part  260 . 
     The second inspection part V 2  may detect an electrode portion notched as the abnormal electrode portion after passing through the lamination part  260 . Here, the second inspection part V 2  may detect a cut electrode tab  11 ′, a mark, or a hole of the electrode portion notched as the abnormal electrode portion through the vision sensor to detect the abnormal electrode portion, thereby transmitting a detection signal to a discharge part  280 . 
     The cell cutting part  270  may cut the stack S of the electrode  10  and the separator  20 , which are laminated after passing through the second inspection part V 2 , into a plurality of cells  30 . Here, the cell cutting part  270  may comprise a pair of cutters and may cut the stack S of the electrode  10  and the separator  20 , which is disposed between the pair of cutters, while moving the pair of cutters vertically. 
     Then, the cut cells  30  may be transferred to a subsequent process through conveyor belts C 1  and C 2 . 
     The discharge part  280  may discharge defective cells  30 ′ comprising the abnormal electrode portion detected through the second inspection part V 2  from the plurality of cells  30  after passing through the cell cutting part  270 . Here, the discharge part  280  may grip the defective cell  30 ′ comprising the abnormal electrode portion through a jig to separate the defective cell  30 ′ from the cells  30  comprising the normal electrode portion. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited thereto. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention. 
     Furthermore, the scope of protection of the present invention will be clarified by the appended claims. 
     DESCRIPTION OF THE SYMBOLS 
     
         
         
           
               10 : Electrode 
               11 ,  11 ′,  11 ″: Electrode tab 
               20 : Separator 
               30 : Cell 
               100 ,  200 : Apparatus for manufacturing secondary 
             battery 
               110 : Electrode supply part 
               111 : Electrode supply roll 
               120 : Main control system 
               130 : Notching part 
               131 : Laser 
               140 : Electrode winding part 
               141 : Electrode winding roll 
               250 : Separator supply roll 
               260 : Lamination part 
               270 : Cell cutting part 
               280 : Discharge part 
             B: Laser light 
             C 1 , C 2 : Conveyor belt 
             R: Roller 
             Y: Normal electrode portion 
             N: Abnormal electrode portion 
             V 1 : First inspection part 
             V 2 : Second inspection part