Patent Publication Number: US-2021194098-A1

Title: Battery Module Having Guide for Restricting Movement of Busbar Frame, and Battery Pack and Vehicle Comprising Same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/KR2019/017945, filed Dec. 18, 2019, published in Korean, which claims priority to Korean Patent Application No. 10-2018-0169965 filed on Dec. 26, 2018 in the Republic of Korea, the disclosures of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a battery module having a guide for restricting movement of a bus bar frame, and a battery pack and a vehicle including the battery module. More particularly, the present disclosure relates to a battery module having a structure capable of preventing a bonding portion between a bus bar and an electrode lead from being damaged by restricting a bus bar frame coupled to one longitudinal side and the other longitudinal side of a cell stack not to move inside a module frame due to a gap, and a battery pack and a vehicle including the battery module. 
     BACKGROUND ART 
     In a battery module having a structure inserted into a module frame in a state where a bus bar frame assembly and a cell stack are combined, a gap of a certain level or above is inevitably formed between the combined body of the bus bar frame assembly and the cell stack and an inner surface of the module frame. 
     If the gap is reduced or eliminated, the battery module may have better quality when completed, but the process of inserting the combined body in which the bus bar frame assembly and the cell stack are combined into the module frame becomes substantially impossible. In addition, even if the combined body is difficultly inserted into the module frame, components may be damaged during the insertion process due to interference/friction between the module frame and the combined body in which the bus bar frame assembly and the cell stack are combined. 
     For this reason, an insertion portion of the module frame must be formed to have a slightly larger size than the combined body in which the bus bar frame assembly and the cell stack are combined. In this case, the combined body in which the bus bar frame assembly and cell stack are combined is easily inserted into the module frame, which may improve the process efficiency and reduce the possibility of product damage by minimizing interference between components during insertion. However, due to the gap formed between the combined body of the bus bar frame assembly and the cell stack and the inner wall of the module frame, the bus bar frame is inevitably shaken. 
     If the bus bar frame is moved inside the module frame, the position of a bus bar disposed on the bus bar frame and the position of an electrode lead coupled to the bus bar are not kept constant, and thus the product specifications may not be maintained as intended in designing. In addition, if the electrode lead and the bus bar move relative to each other due to the movement of the bus bar frame, the bonding portion between the electrode lead and the bus bar may be damaged, which may cause product defects. 
     Thus, it is urgently needed to develop a battery module with an improved structure, which allows the combined body in which the bus bar frame assembly and the cell stack are combined to be easily inserted into the module frame and also prevents the bus bar frame from being shaken inside the module frame after the insertion. 
     DISCLOSURE 
     Technical Problem 
     The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a battery module with an improved structure, which may allow a combined body in which a bus bar frame assembly and a cell stack are combined to be easily inserted into a module frame and also prevent a bus bar frame from being shaken inside the module frame after the insertion. 
     However, the technical problem to be solved by the present disclosure is not limited to the above, and other objects not mentioned herein will be understood from the following description by those skilled in the art. 
     Technical Solution 
     In one aspect of the present disclosure, there is provided a battery module, comprising: a cell stack formed by stacking a plurality of battery cells; a bus bar frame assembly having a front bus bar frame configured to cover one longitudinal side of the cell stack, a rear bus bar frame configured to cover another longitudinal side of the cell stack, and an upper cover configured to cover at least a portion of an upper surface of the cell stack; and a module frame coupled to the bus bar frame assembly to accommodate the cell stack and the bus bar frame assembly, wherein the front bus bar frame includes at least one first upper guide formed to protrude at an upper end thereof and at least one first side guide formed to protrude at a side portion thereof, and the rear bus bar frame includes at least one second upper guide formed to protrude at an upper end thereof and at least one second side guide formed to protrude at a side portion thereof. 
     The at least one first upper guide may be interposed between the upper end of the front bus bar frame and an inner surface of the module frame, the at least one first side guide may be interposed between the side portion of the front bus bar frame and the inner surface of the module frame, the at least one second upper guide may be interposed between the upper end of the rear bus bar frame and the inner surface of the module frame, and the at least one second side guide may be interposed between the side portion of the rear bus bar frame and the inner surface of the module frame. 
     The front bus bar frame may be hinged to one longitudinal end of the upper cover, and the rear bus bar frame may be hinged to another longitudinal end of the upper cover. 
     The upper cover may have a plurality of guide accommodation grooves configured to accommodate the at least one first upper guide and the at least one second upper guide, respectively. 
     Each of the plurality of guide accommodation grooves may have a notch form dented inward from either the one longitudinal end or the another longitudinal end of the upper cover. 
     Each of the plurality of guide accommodation grooves may be formed to have a depth corresponding to a protruding height of the at least one first upper guide or the at least one second upper guide which the guide accommodation groove is configured to accommodate so that the at least one first upper guide and the at least one second upper guide do not interfere with the upper cover when the front bus bar frame and the rear bus bar frame are pivoted and unfolded to be parallel to the upper cover. 
     The at least one first upper guide and the at least one second upper guide each may have an inclined surface formed by chamfering a respective top edge thereof. 
     The inclined surface formed at the at least one first upper guide and the inclined surface formed at the at least one second upper guide may be oriented in the same direction. 
     The inclined surface formed at the at least one first upper guide and the inclined surface formed at the at least one second upper guide may be oriented toward one longitudinal side or another longitudinal side of the battery module. 
     In other aspects of the present disclosure, there are also provided a battery pack and a vehicle, which each comprise the battery module according to an embodiment of the present disclosure. 
     Advantageous Effects 
     According to an embodiment of the present disclosure, the combined body in which the bus bar frame assembly and the cell stack are combined may be easily inserted into the module frame, and also the bus bar frame may be prevented from being shaken inside the module frame after the insertion. 
    
    
     
       DESCRIPTION OF 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. 
         FIG. 1  is a perspective view showing a battery module according to an embodiment of the present disclosure. 
         FIG. 2  is a diagram showing a state where a module frame is removed, in the battery module of  FIG. 1   
         FIG. 3  is a diagram showing a state where an upper cover is removed, in the battery module of  FIG. 2 . 
         FIG. 4  is a diagram showing a part of a cell stack applied to the battery module according to an embodiment of the present disclosure. 
         FIG. 5  is a plan view showing individual battery cells constituting the cell stack of  FIG. 4 . 
         FIG. 6  is a perspective view showing a FPCB assembly applied to the battery module according to an embodiment of the present disclosure. 
         FIG. 7  is a perspective view showing a bus bar frame assembly applied to the battery module according to an embodiment of the present disclosure. 
         FIG. 8  is a partially enlarged view showing a part of the battery module of  FIG. 2 . 
         FIG. 9  is a front view showing a front bus bar frame applied to the battery module according to an embodiment of the present disclosure. 
         FIG. 10  is a side view showing the front bus bar frame of  FIG. 9 . 
         FIG. 11  is a partially enlarged view showing a part of the bus bar frame assembly of  FIG. 7 . 
         FIG. 12  is a front view showing a rear bus bar frame applied to the battery module according to an embodiment of the present disclosure. 
         FIG. 13  is a side view showing the rear bus bar frame of  FIG. 12 . 
         FIG. 14  is a partially enlarged view showing the battery module according to an embodiment of the present disclosure at the front. 
         FIG. 15  is a partially enlarged view showing the battery module according to an embodiment of the present disclosure at the side. 
         FIG. 16  is a perspective view showing a module frame applied to the battery module according to an embodiment of the present disclosure. 
     
    
    
     BEST MODE 
     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, referring to  FIGS. 1 to 3 , a battery module according to an embodiment of the present disclosure may be implemented to include a cell stack  100 , a FPCB assembly  200 , a bus bar frame assembly  300 , a module terminal  400  and a module frame  500 . 
     Referring to  FIG. 4 , the cell stack  100  includes a plurality of battery cells  110  stacked to face each other at wide surfaces thereof. The cell stack  100  may include at least one buffer pad P interposed at an outermost battery cell  110  and/or between adjacent battery cells  110 . 
     That is, referring to  FIG. 4  along with  FIGS. 1 to 3 , the cell stack  100  may be inserted into the module frame  500  in a state of being coupled with the FPCB assembly  200 , the bus bar frame assembly  300  and the module terminal  400 . At this time, in order to insert the cell stack  100  easily while securing a maximum volume of the cell stack  100 , the buffer pad P made of an elastic material such as a sponge may be additionally applied. 
     Referring to  FIG. 5 , a pouch-type battery cell may be applied as the battery cell  110 . As shown in  FIG. 4 , the pouch-type battery cell  110  includes an electrode assembly (not shown), a pair of electrode leads  111  and a cell case  112 . 
     Although not shown in the drawings, the electrode assembly has a form in which separators are interposed between positive electrode plates and negative electrode plates that are repeatedly stacked alternately, and separators are preferably positioned at both outermost sides for insulation, respectively. 
     The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer coated on one side of the positive electrode current collector, and a positive electrode uncoated region not coated with a positive electrode active material is formed at one side end of the positive electrode plate. The positive electrode uncoated region functions as a positive electrode tab. 
     The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer coated on one surface or both sides of the negative electrode current collector, and a negative electrode uncoated region not coated with a negative electrode active material is formed at one side end of the negative electrode plate. The negative electrode uncoated region functions as a negative electrode tab. 
     In addition, the separator is interposed between the positive electrode plate and the negative electrode plate to prevent electrode plates having different polarities from directly contacting each other. The separator may made of a porous material so that ions may be moved using the electrolyte as a medium between the positive electrode plate and the negative electrode plate. 
     The pair of electrode leads  111  are connected to the positive electrode tab (not shown) and the negative electrode tab (not shown), respectively, and are drawn out of the cell case  112 . The pair of electrode leads  111  are drawn out at one longitudinal side and the other longitudinal side of the battery cell  110 , respectively. That is, the battery cell  110  applied to the present disclosure corresponds to a bidirectional draw-out battery cell in which the positive electrode lead and the negative electrode lead are drawn in opposite directions. 
     In addition, the pair of electrode leads  111  are positioned to be biased to one side from a center of the battery cell  110  in a width direction (the Z-axis direction of  FIGS. 4 and 5 ). Specifically, the pair of electrode leads  111  are positioned to be biased to one side from the center of the battery cell  110  in the width direction, preferably to be biased downward along the height direction (the Z-axis direction of  FIG. 4 ) of the cell stack  100 . 
     If the pair of electrode leads  111  are positioned to be biased to one side from the center of the battery cell  110  in the width direction as described above, it is possible to give a space for installation of a connector  240 , explained later, and the module terminal  400  so that the energy density of the battery module is improved. The increase in energy density due to the structure in which the electrode lead  111  is installed to be biased will be described in detail later. 
     The cell case  112  includes two regions, namely an accommodation portion accommodating the electrode assembly and a sealing portion extending in a circumferential direction of the accommodation portion and thermally fused in a state where the electrode lead  111  is drawn out to seal the cell case  112 . 
     Although not shown in the figures, the cell case  112  is sealed by affixing and thermally fusing edge portions of an upper case and a lower case made of a multi-layered pouch film in which a resin layer, a metal layer and a resin layer are stacked in order. 
     In the sealing portion, a terrace portion  112   a  corresponding to a region located in the direction in which the electrode lead  111  is drawn out has a tapered shape such that both sides of the terrace portion  112   a  are cut so that the width thereof is gradually reduced along the drawing direction of the electrode lead  111 . As described above, if the width of the terrace portion  112   a  is gradually reduced toward the outer side of the battery cell  110 , the electrode lead  111  may be disposed to be biased, and the energy density of the battery module may be improved. 
     Meanwhile, the battery cell  110  applied to the present disclosure is a long cell where a ratio of length (L) to width (W) is about 3 or more and 12 or less. In the battery module according to the present disclosure, if the long cell type battery cell  110  is employed, it is possible to improve the capacity of the battery module while minimizing the increase in the height of the battery module, which makes it easy to install the battery module at a lower part of a seat or a trunk of a vehicle. 
     Next, referring to  FIGS. 6 and 8  along with  FIG. 3 , the FPCB assembly  200  may be implemented to include a first FPCB  210 , a second FPCB  220 , a temperature sensor  230  and a connector  240 . In the present disclosure, the first FPCB  210  and the second FPCB  220  are described as components distinguished from each other, but the first FPCB  210  and the second FPCB  220  may be a single integrated flexible printed circuit board (FPCB). That is, the first FPCB  210  and the second FPCB  220  are just elements that are distinguished according to positions where they are disposed. 
     The first FPCB  210  extends along the longitudinal direction of the cell stack  100  (the Y-axis direction of  FIG. 3 ) to cover at least a portion of the upper surface of the cell stack  100 . The longitudinal ends of the first FPCB  210  are provided with a temperature sensor placing portion formed by cutting a portion of the first FPCB  210 . 
     The temperature sensor  230  is mounted to the upper surface of the temperature sensor placing portion, whereby the temperature sensor  230  is installed at positions corresponding to both ends of the cell stack  100  in the longitudinal direction (parallel to the Y-axis of  FIG. 3 ). In addition, the temperature sensor placing portion is installed at a position corresponding to the center of the cell stack  100  in the width direction (a direction parallel to the X-axis of  FIG. 3 ). 
     The position where the temperature sensor  230  is formed is selected to sense a temperature of a portion with the highest temperature in the cell stack  100 . The FPCB assembly  200  may be connected to a control device that may control charging and discharging of the battery module, such as a battery management system (BMS). If the temperature of the battery module rises above a reference value, in order to ensure safety in use of the battery module, it is preferable to measure the temperature at a location with the highest temperature to control charging and discharging. 
     Thus, in the longitudinal direction of the cell stack  100  (the Y-axis direction of  FIG. 3 ), both longitudinal ends closest to the electrode lead  111  become optimal positions, and in the width direction of the cell stack  100  (the X-axis direction of  FIG. 3 ), the center where heat dissipation is most difficult becomes an optimal position. 
     Referring to  FIGS. 3, 6 and 8  together, the second FPCB  220  is provided in a pair, and the second FPCB s  220  extend from both longitudinal ends of the first FPCB  210  and are electrically connected to a bus bar B, explained later, respectively. That is, the second FPCB  220  has a plurality of connection terminals  221  formed at several branched ends, and the plurality of connection terminals  221  are connected to a plurality of bus bars B, explained later. 
     Meanwhile, the connector  240  is mounted on the second FPCB  220 , and the connector  240  is electrically connected to the connection terminal  221  through the second FPCB  220 . As described above, a control device (not shown) such as BMS is connected to the connector  240 , and the control device receives information about a voltage of the battery cell  110  transmitted through the bus bar B and the connection terminal  221 , information about a temperature of the cell stack  100  measured through the temperature sensor  230 , or the like, and controls charging and discharging of the battery module with reference to the information. 
     Meanwhile, as shown in  FIG. 8 , the connector  240  mounted on the second FPCB  220  faces a front surface (a surface parallel to the X-Z plane of  FIG. 8 ) of the cell stack  100  but is installed in a space formed above the electrode lead  111  due to biasing of the electrode lead  111 . That is, the connector  240  is installed to face an upper portion of the front surface of the cell stack  100 . 
     As such, the connector  240  is installed in the space provided due to the structure in which the electrode lead  111  is installed to be biased, which minimizes the overall volume increase of the battery module caused by the installation of the connector  240 , thereby improving energy density. 
     Next, referring to  FIGS. 7 and 8 , the bus bar frame assembly  300  may be implemented to include a front bus bar frame  310 , a rear bus bar frame  320 , an upper cover  330  and a bus bar B. 
     The front bus bar frame  310  is hinged to one end of the upper cover  330  in the longitudinal direction (a direction parallel to the Y-axis of  FIG. 7 ) to be pivotable relative to the upper cover  330 . Likewise, the rear bus bar frame  320  is hinged to the other longitudinal end of the upper cover  330  to be pivotable relative to the upper cover  330 . 
     Referring to  FIG. 9  along with  FIGS. 7 and 8 , the bus bar frame  310 , for example, may be made of an insulating material such as resin, and includes a bus bar placing portion  311  formed to protrude at a position corresponding to electrode leads  111  of the battery cell  110 . A plurality of bus bars B are fixed and installed on the bus bar placing portion  311 . The bus bar placing portion  311  is formed at a position biased downward from the center of the cell stack  100  in the height direction (the Z-axis direction of  FIGS. 7 and 8 ), like the electrode lead  111 . The biasing of the bus bar placing portion  311  is to secure a space for installing components, similar to the biasing of the electrode lead  111 . 
     The bus bar placing portion  311  has a plurality of lead slits S formed at positions corresponding to the electrode leads  111 . Through the lead slits S, the electrode leads  111  are drawn out of the front bus bar frame  310 , and the drawn electrode leads  111  are bent and fixed by welding or the like on the bus bar B. 
     Referring to  FIGS. 9 to 11 , the front bus bar frame  310  includes at least one first upper guide  312  protruding at an upper end thereof and at least one first side guide  313  protruding at a side portion thereof. 
     Referring to  FIG. 14  along with  FIGS. 8 and 9 , the first upper guide  312  is interposed between the upper end of the front bus bar frame  310  and the inner surface of the module frame  500 , thereby minimizing that the front bus bar frame  310  is shaken inside the module frame  500  in the vertical direction (a direction parallel to the Z-axis of  FIG. 14 ). 
     The front bus bar frame  310  is hinged to the upper cover  330  as described above, and a gap may exist in the hinged portion, whereby the front bus bar frame  310  may move. As described above, if movement occurs in the front bus bar frame  310 , the coupling portion between the bus bar B and the electrode lead  111  provided in the bus bar frame  310  may be damaged, and the product specifications may not be maintained as intended in designing. It can cause problems that cannot be. The first upper guide  312  can minimize the vertical movement of the front bus bar frame  310 , thereby preventing this problem from occurring. 
     Meanwhile, the first upper guide  312  is preferably provided in at least one pair. That is, at least one first upper guide  312  may be provided at each of both sides based on the center of the front bus bar frame  310  in the longitudinal direction (a direction parallel to the X-axis of  FIG. 9 ) for stable fixing of the front bus bar frame  310 . 
     Referring to  FIG. 10 , the first upper guide  312  has an inclined surface formed by chamfering a top edge thereof. When a combined body including the cell stack  100 , the FPCB assembly  200  and the bus bar frame assembly  300  is inserted into the module frame  500 , the inclined surface allows the combined body to be naturally inserted. The insertion of the module frame  500  is performed along the arrow direction. 
     The inclined surface provided to the first upper guide  312  may be formed to face one side or the other side of the battery module in the longitudinal direction (a direction parallel to the Y-axis of  FIG. 10 ). The figures of the present disclosure just show the case where the inclined surface provided to the first upper guide  312  is formed to face the rear side of the battery module, but it just assumes that the module frame  500  is coupled from the rear side of the battery module toward the front side thereof, and the location where the inclined surface of the first upper guide  312  is formed is not limited thereto. 
     Referring to  FIG. 14  along with  FIGS. 8 and 9 , the first side guide  313  is interposed between the side portion of the front bus bar frame  310  and the inner surface of the module frame  500 , thereby minimizing that the front bus bar frame  310  is shaken in the left and right direction (a direction parallel to the X-axis of  FIG. 14 ) inside the module frame  500 . 
     The front bus bar frame  310  is hinged to the upper cover  330  as described above, and a gap may exist in the hinged portion, whereby the front bus bar frame  310  may move. If movement occurs in the front bus bar frame  310  as described above, the coupling portion between the bus bar B and the electrode lead  111  provided to the bus bar frame  310  may be damaged, and the product specifications may not be maintained as intended in designing. The first side guide  313  may minimize the movement of the front bus bar frame  310  in the left and right direction, thereby preventing the above problem from occurring. 
     Meanwhile, it is preferable that the first side guide  313  is provided in at least two pairs. That is, the first upper guide  312  is formed on one longitudinal side and the other longitudinal side of the front bus bar frame  310  for stable fixing of the front bus bar frame  310 , respectively, and at least one first upper guide  312  may also be provided to both sides based on the center of the front bus bar frame  310  in the height direction (a direction parallel to the Z-axis of  FIG. 9 ), respectively. 
     Next, referring to  FIG. 12  along with  FIGS. 7 and 8 , similar to the front bus bar frame  310  described above, the rear bus bar frame  320  may be made of an insulating material, for example resin, and has a bus bar placing portion  321  formed to protrude at a position corresponding to the electrode leads  111  of the battery cell  110 . A plurality of bus bars B are fixedly installed on the bus bar placing portion  321 . The bus bar placing portion  321  is formed at a position biased downward from the center of the cell stack  100  in the height direction (a direction parallel to the Z-axis of  FIGS. 7 and 12 ), like the electrode lead  111 . 
     The bus bar placing portion  321  has a plurality of lead slits S formed at positions corresponding to the electrode leads  111 . The electrode leads  111  are drawn out of the rear bus bar frame  320  through the lead slits S, and the drawn electrode leads  111  are bent and fixed by welding or the like on the bus bar B. 
     Referring to  FIGS. 12 and 13 , the rear bus bar frame  320  includes at least one second upper guide  322  protruding at an upper end thereof and at least one second side guide  323  protruding at a side portion thereof. 
     Like the first upper guide  312  described above, the second upper guide  322  is interposed between the upper end of the rear bus bar frame  320  and the inner surface of the module frame  500 , thereby minimizing that the rear bus bar frame  320  is shaken inside the module frame  500  in the vertical direction (a direction parallel to the Z-axis of  FIG. 12 ). 
     The rear bus bar frame  320  is hinged to the upper cover  330  as described above, and a gap may exist in the hinged portion, whereby the rear bus bar frame  320  may move. If movement occurs in the rear bus bar frame  320  as described above, the coupling portion between the bus bar B and the electrode lead  111  provided to the bus bar frame  320  may be damaged, and the product specifications may not be maintained as intended in designing. The second upper guide  322  may minimize the vertical movement of the rear bus bar frame  320 , thereby preventing the above problem from occurring. 
     Meanwhile, the second upper guide  322  is preferably provided in at least one pair. That is, at least one second upper guide  322  may be provided to each of both sides based on the center of the rear bus bar frame  320  in the longitudinal direction (a direction parallel to the X-axis of  FIG. 12 ) for stable fixation of the rear bus bar frame  320 . 
     Referring to  FIG. 13 , the second upper guide  322  has an inclined surface formed by chamfering a top edge thereof. When the combined body including the cell stack  100 , the FPCB assembly  200  and the bus bar frame assembly  300  is inserted into the module frame  500 , the inclined surface allows natural insertion. The insertion of the module frame  500  follows the arrow direction. 
     The inclined surface provided to the second upper guide  322  may be oriented toward one side or the other side of the battery module in the longitudinal direction (a direction parallel to the Y-axis of  FIG. 13 ). The inclined surface formed at the second upper guide  322  is oriented in the same direction as the inclined surface formed at the first upper guide  312 . 
     The figures of the present disclosure show only the case where the inclined surface provided to the second upper guide  322  is formed to face the rear side of the battery module, but it just assumes that the module frame  500  is coupled from the rear side of the battery module toward the front side thereof, and the location at which the inclined surface of the second upper guide  322  is formed is not limited thereto. 
     Referring to  FIGS. 8 and 11 , the upper cover  330  is connected to the front bus bar frame  310  and the rear bus bar frame  320  through a hinge coupling and covers the upper surface of the cell stack  100  (a surface parallel to the X-Y plane of  FIG. 8 ). 
     As shown in  FIG. 11 , the upper cover  330  includes a plurality of guide accommodation grooves  331  formed at positions corresponding to the first upper guide  312  and the second upper guide  322 . Each guide accommodation groove  331  has a notch form dented inward from a side end of the upper cover  330  at which the accommodation groove  331  is located in the longitudinal direction (a direction parallel to the Y-axis of  FIG. 11 ). 
     The guide accommodation grooves  331  are formed so that the first upper guide  312  and the second upper guide  322  do not interfere with the upper cover  330  when the front bus bar frame  310  and the rear bus bar frame  320  are pivoted based on their hinged portions and unfolded to be parallel to the upper cover  330 . As such, in view of the purpose of avoiding interference, the guide accommodation groove  331  is formed to have a depth corresponding to the protruding height of the first upper guide  312  and the second upper guide  322 . 
     Referring to  FIG. 15  along with  FIG. 8 , the module terminal  400  is provided in a pair, and the module terminals  400  are respectively connected to the electrode leads  111  located at outsides of the both sides of the cell stack  100  in the width direction (a direction parallel to the X-axis of  FIG. 8 ) among the electrode leads  111 . 
     Like the connector  240  described above, the module terminal  400  is located in the space formed above the electrode lead  111  and the bus bar placing portion  311  due to the biasing of the electrode lead  111 . The location where the module terminal  400  is formed may minimize the overall volume increase of the battery module caused by installing the module terminal  400  since it utilizes the space formed by the biased installation of the electrode lead  111 . 
     Referring to  FIG. 16  along with  FIG. 1 , the module frame  500  accommodates a combined body formed by combining the cell stack  100 , the FPCB assembly  200 , the bus bar frame assembly  300  and the module terminal  400 . The module frame  500  may be coupled to the bus bar frame assembly  300  in a direction from the rear bus bar frame  320  toward the front bus bar frame  310  or in a direction opposite thereto. 
     As described above, in the battery module according to an embodiment of the present disclosure, the combined body in which the bus bar frame assembly  300  and the cell stack  100  are combined may be easily inserted into the module frame  500  due to the guide structures protrusively formed at the bus bar frames  310 ,  320 , and also the bus bar frames  310 ,  320  may be prevented from shaking inside the module frame  500  after the insertion. 
     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.