Patent Publication Number: US-2023150072-A1

Title: Automatic pressure jig device for bringing electrode lead into close contact with busbar, and battery module manufacturing system comprising same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This Application is a Continuation of U.S. patent application Ser. No. 16/768,018, filed on May 28, 2020, which is a U.S. National Stage of PCT/KR2019/003200 filed on Mar. 19, 2019, which claims priority to Korean Patent Application No. 10-2018-0072157 filed on Jun. 22, 2018 in the Republic of Korea, the disclosures of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     Field 
     The present disclosure relates to an automatic pressing jig apparatus that closely contacts an electrode lead with a bus bar and a system for manufacturing a battery module including the same, and more particularly, to an automatic pressing job apparatus that is used to closely contact an electrode lead assembly of each of a plurality of groups of battery cell stacks with a bus bar simultaneously, and a system for manufacturing a battery module including the same. 
     Discussion of the Related Art 
     In a general battery module, a bus bar is applied for electric connection between stacked battery cells, and a plurality of electrode leads drawn out respectively from a plurality of battery cells are bent and located on the bus bar to be welded. 
     When a battery module is manufactured as such, a bent electrode lead is pressed in a direction towards a bus bar by using a jig while the electrode lead is located on the bus bar such that the electrode lead closely contacts the bus bar, and then a laser beam is emitted on the electrode lead to perform welding. 
     Referring to  FIGS.  1  and  2   , a general battery module in which a plurality of pouch type battery cells are electrically connected to each other by a bus bar is shown. 
     Such a general battery module is manufactured by inserting an electrode lead  2  drawn out from each of a plurality of pouch type battery cells  1  into a lead slit  4  of a bus bar  3  as shown in  FIG.  1   , and then bending and welding the inserted electrode lead  2  in closely contact with the bus bar  3 . 
     However, the general battery module complicates manufacturing processes because a process of bending the electrode lead  2  is additionally required in addition to a process of inserting the electrode lead  2  into the lead slit  4  of the bus bar  3  and a process of welding the electrode lead  2  to the bus bar  3 . 
     Also, in case of a pouch type cell applied to a battery module, when the thickness of a cell is decreased, the length of an electrode lead is also decreased. As such, when the length of the electrode lead is decreased, a bonding area between the electrode lead and a bus bar is also decreased, thereby deteriorating combining strength and consequently increasing the possibility of product failure. 
     Accordingly, it is required to develop a battery module structure in which a bending process of an electrode lead can be omitted, and accordingly, it is also required to develop a new pressing jig for welding, which is suitable for a bonding structure of the electrode lead and a bus bar. 
     SUMMARY OF THE INVENTION 
     The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing an automatic pressing jig apparatus that presses a bus bar from both sides such that welding is performed while the bus bar and an electrode lead are in close contact with each other, while manufacturing a battery module in which the electrode lead is combined to the bus bar via welding without being bent to be combined with the bus bar. 
     Also, the present disclosure is directed to providing an automatic pressing jig apparatus that performs a contacting operation through a single process while enabling close contact to be performed between an electrode lead assembly and a bus bar at a plurality of locations with uniform force, while closely contacting the electrode lead assembly of each of a plurality of groups of battery cell stacks with the bus bar. 
     In addition, the present disclosure is directed to providing an automatic pressing jig apparatus that enables a surface of a bus bar and an electrode lead assembly to form a same plane, while closely contacting the electrode lead assembly of each of a plurality of groups of battery cell stacks with the bus bar. 
     However, it is to be understood that the technical problems to be solved by the present disclosure are not limited to the above, and other problems that are not described here will become apparent to one of ordinary skill in the art from the description of the disclosure below. 
     In one aspect of the present disclosure, there is provided an automatic pressing jig apparatus that closely contacts a lead assembly and a bus bar provided in a battery module to each other, the automatic pressing jig apparatus including: a plurality of contacting units configured to simultaneously press each of a plurality of bus bars provided in the battery module and press an end of the lead assembly from a top of the plurality of bus bars to prevent the lead assembly from protruding from a surface of the plurality of bus bars; a pair of pressing units connected to the plurality of contacting units and configured to adjust a pressing force of the plurality of contacting units with respect to the plurality of bus bars; a support frame supporting the pair of pressing units; and a distance adjusting unit connected to the support frame and configured to ascend or descend the support frame to move the plurality of contacting units away from or close to the battery module. 
     The plurality of contacting units may include a contacting frame moving downward by movement of the distance adjusting unit to press the plurality of bus bars from both sides. 
     The pair of pressing units may include a first pressing unit provided at one side of the plurality of contacting units and a second pressing unit provided at the other side of the plurality of contacting units, wherein the contacting frame may include a first contacting frame connected to the first pressing unit and a second contacting frame connected to the second pressing unit and coupled to the first contacting frame via a hinge. 
     The plurality of contacting units may further include a lead pressing frame provided inside the contacting frame and moved downward together with the contacting frame by the distance adjusting unit to press the lead assembly from the top of the plurality of bus bars. 
     The first contacting frame may include a first distance adjusting portion connected to the first pressing unit and a first pressing portion contacting the plurality of bus bars, and the second contacting frame may include a second distance adjusting portion connected to the second pressing unit and a second pressing portion contacting the plurality of bus bars. 
     The first contacting frame and the second contacting frame may be combined to each other via a hinge to increase a distance between the first pressing portion and the second pressing portion when a distance between the first distance adjusting portion and a second distance adjusting portion is decreased, and decrease the distance between the first pressing portion and the second pressing portion when the distance between the first distance adjusting portion and the second distance adjusting portion is increased. 
     The first pressing unit may include a first pressing rod connected to the first contacting frame and a first pressing actuator directly or indirectly connected to the first pressing rod to move the first pressing rod in a direction towards or away from the plurality of contacting units, and the second pressing unit may include a second pressing rod connected to the second contacting frame and a second pressing actuator directly or indirectly connected to the second pressing rod to move the second pressing rod in a direction towards or away from the plurality of contacting units. 
     An end of the first contacting frame connected to the first pressing rod and an end of the second contacting frame connected to the second pressing rod may not face each other to prevent the first pressing rod and the second pressing rod from interfering with each other. 
     The pair of pressing units each may further include: a first connecting plate having one side coupled to the first pressing rod and the other side coupled to an end of the first contacting frame; and a second connecting plate having one side coupled to the second pressing rod and the other side connected to an end of the second contacting frame. 
     The automatic pressing jig apparatus may further include a damper disposed between the first connecting plate and the first pressing rod and between the second connecting plate and the second pressing rod. 
     A first open portion may be provided between the first contacting frame and the second contacting frame. 
     The lead pressing frame may be fixed to the hinge and move together with the contacting frame. 
     A portion of the lead pressing frame contacting the lead assembly may have a shape of an H beam, a pair of second open portions communicating with the first open portion may be provided at both sides of a barrier wall forming the H beam, and the pair of second open portions may be provided at positions corresponding to the lead assembly. 
     A portion of the lead pressing frame contacting the lead assembly may include a pair of horizontal bars extending in parallel spaced apart from each other and a barrier wall connecting center portions of the pair of horizontal bars, wherein the pair of horizontal bars may press the lead assembly. 
     A distance between outer edge portions of the pair of horizontal bars may be equal to or less than a width of the lead assembly. 
     According to one aspect of the present disclosure, a bus bar and an electrode lead can be welded while closely contacting each other, while manufacturing a battery module in which the electrode lead is combined to the bus bar via welding without being bent to be combined with the bus bar. 
     Also, according to another aspect of the present disclosure, a contacting operation can be performed through a single process while close contact is performed between an electrode lead assembly and a bus bar at a plurality of locations with uniform force, while closely contacting the electrode lead assembly of each of a plurality of groups of battery cell stacks with the bus bar. 
     In addition, according to another aspect of the present disclosure, a surface of a bus bar and an electrode lead assembly can form a same plane, while closely contacting the electrode lead assembly of each of a plurality of groups of battery cell stacks with the bus bar, and thus a portion of the electrode lead assembly protruding outside the surface of the bus bar is not present, thereby improving quality of electric connection. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings illustrate a preferred embodiment of the present disclosure and together with the foregoing disclosure, serve to provide further understanding of the technical features of the present disclosure, and thus, the present disclosure is not construed as being limited to the drawing. 
         FIGS.  1  and  2    are diagrams of processes of combining an electrode lead and a bus bar while manufacturing a general battery module. 
         FIG.  3    is a diagram of a system for manufacturing a battery module, in which an automatic pressing jig apparatus and the battery module are combined to each other, according to an embodiment of the present disclosure. 
         FIGS.  4  through  6    are diagrams respectively showing before, and after an electrode lead and a bus bar are pressed by an automatic pressing jig apparatus, according to an embodiment of the present disclosure. 
         FIGS.  7  and  8    are diagrams of a contacting unit included in an automatic pressing jig apparatus, according to an embodiment of the present disclosure. 
         FIG.  9    is a diagram of a lead assembly being pressed by a lead pressing unit provided at an end of a pressing frame applied to the present disclosure, such as not to protrude outside a lead slit provided at a bus bar. 
         FIGS.  10  through  12    are diagrams of a pressing unit and a bus bar applied to the present disclosure, and an electrode lead, for describing processes of the electrode lead and the bus bar being pressed by a contacting unit. 
         FIG.  13    is a diagram showing a pressing unit and a contacting unit combined to each other. 
         FIG.  14    is a diagram of a first pressing unit and a contacting unit combined to each other. 
         FIG.  15    is a diagram of a second pressing unit and a contacting unit combined to each other. 
         FIG.  16    is a diagram for describing a structure and operating principles of a connecting damper connecting a pressing unit and a contacting unit to each other. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to the description, it should be understood that the terms used in the specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present disclosure on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Therefore, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the disclosure, so it should be understood that other equivalents and modifications could be made thereto without departing from the scope of the disclosure. 
     First, an overall configuration of a system for manufacturing a battery module, according to an embodiment of the present disclosure, will be described with reference to  FIGS.  3  through  6   . 
       FIG.  3    is a diagram of a system for manufacturing a battery module, in which an automatic pressing jig apparatus and the battery module are combined to each other, according to an embodiment of the present disclosure, and  FIGS.  4  through  6    are diagrams respectively showing before, during, and after an electrode lead and a bus bar are pressed by an automatic pressing jig apparatus, according to an embodiment of the present disclosure. 
     Referring to  FIGS.  3  through  6   , the system according to an embodiment of the present disclosure includes a battery module  100  and an automatic pressing jig apparatus  200  provided at one side of the battery module  100 . 
     The battery module  100  includes a cell stack  110 , a module case  120  accommodating the cell stack  110 , and a bus bar  130  contacting a lead assembly T drawn out from the cell stack  110 . 
     The cell stack  110  includes a plurality of unit cell stacks, i.e., first through fourth unit cell stacks  110 A through  110 D. In the drawings of the present disclosure, the cell stack  110  includes only the first through fourth unit cell stacks  110 A through  110 D, but the present disclosure is not limited by the number of unit cell stacks illustrated, and the number of unit cell stacks is not limited as long as the number is two or more. 
     Each of the first through fourth unit cell stacks  110 A through  110 D is realized as a plurality of battery cells  111  are stacked on each other while facing each other, and each of the battery cells  111  forming one unit cell stack by being stacked on each other includes an electrode lead  111   a.    
     The electrode leads  111   a  included in each of the battery cells  111  forming each of the first through fourth unit cell stacks  110 A through  110 D form one or more groups, and are gathered to form one or more lead assemblies T. 
     The lead assembly T drawn out from the same unit cell stack is inserted into a lead slit  130   a  (see  FIG.  10   ) formed at the bus bar  130 , and closely contacts the bus bar  130  as the bus bar  130  is pressed by the automatic pressing jig apparatus  200 . 
     The automatic pressing jig apparatus  200  is an apparatus for pressing the bus bar  130  such that the bus bar  130  and the electrode lead  111   a  closely contact each other, by being arranged at one side of the battery module  100 , and includes a distance adjusting unit  210 , a support frame  220 , a contacting unit  240 , and a pair of pressing units  250  and  260 . 
     The distance adjusting unit  210  is a component that enables the support frame  220  to move by being connected to the support frame  220  such that the plurality of contacting units  240  are moved away from or close to the battery module  100 . 
     The distance adjusting unit  210  may include a distance adjusting actuator  211  and a fixing plate  213  connected to the distance adjusting actuator  211 . 
     The distance adjusting actuator  211  is not limited as long as the distance adjusting actuator  211  moves automatically or manually to allow up-and-down movement of the contacting unit  240 . As an example of the distance adjusting actuator  211 , an actuator that performs a piston reciprocating motion may be applied. In this case, the distance adjusting actuator  211  includes a distance adjusting cylinder  211   a  and a distance adjusting piston  211   b  inserted into the distance adjusting cylinder  211   a  and performing up-and-down movement in a direction towards or away from the battery module  100 . 
     Also, the fixing plate  213  may be coupled to one side end of the distance adjusting piston  211   b,  and in this case, the distance adjusting actuator  211  and the support frame  220  are coupled to each other via the fixing plate  213 . 
     The distance adjusting unit  210  may be provided at each of one side and the other side of the support frame  220  in a length direction, and in this case, the distance adjusting unit  210  and the support frame  220  may be further stably combined to each other compared to when only one distance adjusting unit  210  is provided. 
     The support frame  220  moves in the up-and-down direction according to movement of the distance adjusting unit  210  by being connected to the distance adjusting unit  210  as described above, and accommodates the plurality of contacting units  240  in an internal space thereof. Also, the support frame  220  functions as a base frame to which the pair of pressing units  250  and  260  may be fixed. 
     In other words, the support frame  220  enables the pair of pressing units  250  and  260  to move in the up-and-down direction according to the movement of the distance adjusting unit  210  in the up-and-down direction, thereby enabling the plurality of contacting units  240  connected to the pair of pressing units  250  and  260  to move together in the up-and-down direction. 
     The plurality of contacting units  240  are connected to the support frame  220  through the pair of pressing units  250  and  260 , and thus are moved in a direction towards or away from the battery module  100  according to the movement of the distance adjusting unit  210  in the up-and-down direction. 
     The plurality of contacting units  240  move towards the battery module  100  according to descending motion of the distance adjusting unit  210  to simultaneously press each of the plurality of bus bars  130  included in the battery module  100 , and press the end of the electrode lead  111   a  from a top of the bus bar  130  such that the electrode lead  111   a  does not protrude from a surface of the bus bar  130 . 
     A specific structure of the contacting unit  240  and a specific pressing mechanism of the bus bar  130  will be described in detail below. 
     Hereinafter, the specific structure and a pressing operation of the contacting unit  240  applied to the present disclosure will be described in detail with reference to  FIGS.  7  through  12    together with  FIGS.  4  through  6   . 
       FIGS.  7  and  8    are diagrams of a contacting unit included in an automatic pressing jig apparatus, according to an embodiment of the present disclosure,  FIG.  9    is a diagram of a lead assembly being pressed by a lead pressing unit provided at an end of a pressing frame applied to the present disclosure, such as not to protrude outside a lead slit provided at a bus bar. Also,  FIGS.  10  through  12    are diagrams of a pressing unit and a bus bar applied to the present disclosure, and an electrode lead, for describing processes of the electrode lead and the bus bar being pressed by a contacting unit. 
     Referring to  FIGS.  7  through  12   , the contacting unit  240  applied to the automatic pressing jig apparatus  200  according to an embodiment of the present disclosure includes a pair of contacting frames  241  and  242 , a hinge  243 , and a lead pressing frame  244 . 
     The pair of contacting frames  241  and  242  includes the first contacting frame  241  and the second contacting frame  242  that are coupled to each other by the hinge  243  to be relatively rotatable. 
     In the present disclosure, in the first contacting frame  241 , based on a portion combined to the second contacting frame  242  by the hinge  243 , a portion located at one side will be defined as a first distance adjusting portion  241   a  and a portion located at the other side will be defined as a first pressing portion  241   b.    
     Similarly, in the second contacting frame  242 , based on a portion combined to the first contacting frame  241  by the hinge  243 , a portion located at one side will be defined as a second distance adjusting portion  242   a  and a portion located at the other side will be defined as a second pressing portion  242   b.    
     While the first contacting frame  241  and the second contacting frame  242  are combined to each other by the hinge  243 , a distance between the first pressing portion  241   b  and the second pressing portion  242   b  is increased when a distance between the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  is decreased. On the other hand, the first contacting frame  241  and the second contacting frame  242  are combined to each other by the hinge  243  such that the distance between the first pressing portion  241   b  and the second pressing portion  242   b  is decreased when the distance between the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  is increased. 
     With respect to using the automatic pressing jig apparatus  200 , the bus bar  130  may be pressed from both sides by contacting the first pressing portion  241   b  and the second pressing portion  242   b  of the contacting unit  240  with both side portions of the bus bar  130  in a length direction by using the distance adjusting unit  210 , and then operating the pair of pressing units  250  and  260  such that the distance between the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  is increased. 
     Meanwhile, as will be described below, a first pressing rod  253  is connected to an end of the first contacting frame  241  and a second pressing rod  263  is connected to an end of the second contacting frame  242 . Accordingly, the end of the first contacting frame  241  and the end of the second contacting frame  242  extend in different directions such as not to face each other, such that interference does not occur between the first pressing rod  253  and the second pressing rod  263 . 
     The lead pressing frame  244  is located in a space surrounded by the first and second contacting frames  241  and  242 , and is fixed to the hinge  243  to move together with the first and second contacting frames  241  and  242 . 
     Accordingly, the lead pressing frame  244  moves together when the contacting frames  241  and  242  move towards the battery module  100  by the distance adjusting unit  210 , and contacts the top surface of the bus bar  130  and presses an end of the lead assembly T from upward such that the lead assembly T does not protrude from the top surface of the bus bar  130  when the pressing portions  241   b  and  242   b  of the contacting frame  241  contact the both side portions of the bus bar  130  in the length direction. 
     Meanwhile, a first open portion S 1  is provided between the pair of contacting frames  241  and  242  combined to each other, the lead pressing frame  244  includes a pair of second open portions S 2  communicating with the first open portion S 1 , and the pair of second open portions S 2  is separated by a barrier wall  244   a.    
     In other words, a portion of the lead pressing frame  244  contacting the lead assembly T has a shape of an H beam, and the pair of second open portions S 2  located at both sides of the barrier wall  244   a  forming the H beam are provided at positions corresponding to the lead assembly T inserted into the lead slit  130   a  formed at the bus bar  130 . 
     In particular, referring to  FIG.  9   , the portion of the lead pressing frame  244  contacting the lead assembly T includes a pair of horizontal bars B extending in parallel spaced apart from each other and the barrier wall  244   a  connecting center portions of the pair of horizontal bars B. The horizontal bar B and the barrier wall  244   a  extend in an approximate perpendicular direction. 
     A distance D 1  between outer edge portions of the pair of horizontal bars B is equal to or less than a width D 2  of the lead assembly T, i.e., a distance of the lead slit  130   a . Accordingly, when the lead pressing frame  244  descends towards the bus bar  130 , the horizontal bus bar B may contact the lead assembly T. 
     Both side ends of each of the pair of horizontal bars B in a length direction press both side ends of the lead assembly T in a width direction. 
     While the lead assembly T is prevented from protruding outside the lead slit  130   a  as the horizontal bar B presses the lead assembly T from upward as such, a laser beam may be irradiated or a welding rod may approach through the pair of second open portions S 2  provided at both sides based on the barrier wall  244   a,  thereby welding the lead assembly T and the bus bar  130  to each other. 
     In other words, by forming the first and second open portions S 1  and S 2 , a space for the welding rod or laser beam performing welding to bond the bus bar  130  and the lead assembly T to approach from the top of the contacting unit  240  towards the lead assembly T is provided. 
     Also, to enable the approach of the welding rod or laser beam as such, an open hole  220   a  (see  FIG.  3   ) may be provided at the support frame  220  at positions corresponding to the first and second open portions S 1  and S 2 . 
     Next, a specific structure of the pair of pressing units  250  and  260  applied to the automatic pressing jig apparatus  200  according to an embodiment of the present disclosure, and a combination relationship between the pair of pressing units  250  and  260  and the contacting unit  240  will be described in detail with reference to  FIGS.  13  through  16   , together with  FIGS.  4  and  6    described above. 
       FIG.  13    is a diagram showing a pressing unit and a contacting unit combined to each other.,  FIG.  14    is a diagram of a first pressing unit and a contacting unit combined to each other, and  FIG.  15    is a diagram of a second pressing unit and a contacting unit combined to each other. Also,  FIG.  16    is a diagram for describing a structure and operating principles of a connecting damper connecting a pressing unit and a contacting unit to each other. 
     First, referring to  FIGS.  13  through  16    together with  FIGS.  4  through  6   , the pair of pressing units  250  an  260  includes the first pressing unit  250  fixed to one side of the support frame  220  and the second pressing unit  260  fixed to the other side of the support frame  220 . In other words, the pair of pressing units  250  and  260  are fixed on the support frame  220  to move up and down when the support frame  220  moves up and down. Also, the pair of pressing units  250  and  260  adjust a pressing force of the plurality of contacting units  240  with respect to the bus bar  130  by being connected to the plurality of contacting units  240 . 
     The first pressing unit  250  is located at one side of the plurality of contacting units  240  and includes a first pressing actuator  251 , the first pressing rod  253 , a first support plate  254 , and a first connecting plate  255 . 
     Similarly, the second pressing unit  260  is located at the other side of the plurality of contacting units  240  and includes a second pressing actuator  261 , the second pressing rod  263 , a second support plate  264 , and a second connecting plate  265 . 
     The first pressing actuator  251  is fixed to one side of the support frame  220  to move together with the support frame  220 , and for example, may include a first pressing cylinder  251   a  and a first pressing piston  251   b  inserted into the first pressing cylinder  251   a  and movable in a direction towards or away from the contacting unit  240 . 
     Similarly, the second pressing actuator  261  is fixed to the other side of the support frame  220  to move together with the support frame  220 , and for example, may include a second pressing cylinder  261   a  and a second pressing piston  261   b  inserted into the second pressing cylinder  261   a  and movable in a direction towards or away from the contacting unit  240 . 
     The first pressing rod  253  has one side connected to the first support plate  254  and the other side connected to the plurality of first contacting frames  241 , and the first support plate  254  is connected to the first pressing actuator  251 . Accordingly, the first pressing rod  253  enables the first contacting frame  241  to move in a direction away from or towards the second contact frame  242  according to movement of the first pressing actuator  251 . 
     Similarly, the second pressing rod  263  has one side connected to the second support plate  264  and the other side connected to the plurality of second contacting frames  242 , and the second support plate  264  is connected to the second pressing actuator  261 . Accordingly, the second pressing rod  263  enables the second contacting frame  242  to move in a direction away from or towards the first contacting frame  241  according to movement of the second pressing actuator  261 . 
     In particular, the first pressing rod  253  and the second pressing rod  263  are respectively connected to the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a,  and accordingly, the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  rotate around a rotation shaft of the hinge  243  according to movement of the first pressing rod  253  and the second pressing rod  263 , and thus the distance between the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  may be increased or decreased. 
     When the distance between the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  is decreased, the distance between the first pressing portion  241   b  and the second pressing portion  242   b  is increased, and thus a pressing force with respect to the bus bar  130  is weakened. On the other hand, when the distance between the first distance adjusting portion  241   a  and the second distance adjusting portion  242   a  is increased, the distance between the first pressing portion  241   b  and the second pressing portion  242   b  is decreased, and thus a pressing force with respect to the bus bar  130  is strengthened. 
     Accordingly, an apparatus operator may adjust the movement of the first pressing actuator  251  and the second pressing actuator  261  to perform pressing of the bus bar  130  by using the contacting unit  240 . 
     Meanwhile, the first pressing rod  253  and the first contacting frame  241  may be combined via the first connecting plate  255 , and similarly, the second pressing rod  263  and the second contacting frame  242  may be combined via the second connecting plate  265 . 
     In other words, the first pressing rod  253  may penetrate and be combined to one side of the first connecting plate  255  in a length direction, and a connecting damper  270  may be combined to the other side of the first connecting plate  255  in the length direction. Similarly, the second pressing rod  263  may penetrate and be combined to one side of the second connecting plate  265  in a length direction, and the connecting damper  270  may be combined to the other side of the second connecting plate  265  in the length direction. 
     The connecting damper  270  is a component provided considering that pressing forces of the contacting unit  240  applied to the bus bars  130  are not completely the same, and performs a damping function to absorb pressing force tolerance. 
     A hydraulic damper, for example, may be applied to the connecting damper  370 , and the connecting damper  270  may include a damper cylinder  271  penetrating and fixed to the connecting plates  255  and  265  and a damper piston  272  inserted into the damper cylinder  271  for piston reciprocating motion and penetrating and fixed to the pair of contacting frames  241  and  242 . 
     As described above, according to the system for manufacturing a battery module, according to an embodiment of the present disclosure, the plurality of bus bars  130  are simultaneously pressed with same force by using the plurality of contacting units  240 , and at the same time, the electrode lead  111   a  and the lead assembly T may be pressed downward from the top surface of the bus bar  130  such as not to protrude from the top surface of each bus bar  130 . Thus, according to the system for manufacturing a battery module, according to an embodiment of the present disclosure, not only efficiency of a welding process is increased, but also contact between the lead assembly T and the bus bar  130  is increased, and in addition, the electrode lead  111   a  may be prevented from being damaged as the lead assembly T protrudes from the surface of the bus bar  130 . 
     The present disclosure has been described in detail. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the disclosure, are given by way of illustration only, since various changes and modifications within the scope of the disclosure will become apparent to those skilled in the art from this detailed description. 
     LIST OF REFERENCE NUMERALS 
       100 : Battery Module 
       110 : Cell Stack 
       110   a : First Unit Cell Stack 
       110   b : Second Unit Cell Stack 
       110   c : Third Unit Cell Stack 
       111 : Battery Cell 
       111   a : Electrode Lead 
     T: Lead Assembly 
       120 : Module Case 
       130 : Bus Bar 
       130   a : Lead Slit 
       200 : Automatic Pressing Jig Apparatus 
       210 : Distance Adjusting Unit 
       211 : Distance Adjusting Actuator 
       211   a : Distance Adjusting Cylinder 
       211   b : Distance Adjusting Piston 
       213 : Fixing Plate 
       220 : Support Frame 
       240 : Contacting Unit 
       241 : First Contacting Frame 
       241   a : First Distance Adjusting Portion 
       241   b : First Pressing Portion 
       242 : Second Contacting Frame 
       242   a : Second Distance Adjusting Portion 
       242   b : Second Pressing Portion 
       243 : Hinge 
       244 : Lead Pressing Frame 
     B: Horizontal Bar 
       244   a : Barrier Wall 
     S 1 : First Open Portion 
     S 2 : Second Open Portion 
       250 : First Pressing Unit 
       251 : First Pressing Actuator 
       251   a : First Pressing Cylinder 
       251   b : First Pressing Piston 
       253 : First Pressing Rod 
       254 : First Support Plate 
       255 : First Connecting Plate 
       260 : Second Pressing Unit 
       261 : Second Pressing Actuator 
       261   a : Second Pressing Cylinder 
       261   b : Second Pressing Piston 
       263 : Second Pressing Rod 
       264 : Second Support Plate 
       265 : Second Connecting Plate 
       270 : Connecting Damper 
       271 : Damper Cylinder 
       272 : Damper Piston