Battery module including upper and lower end separated bus bar frame and method for assembling same

Abstract

The present invention relates to an upper and lower end separated busbar frame and a battery module including the same, and more particularly to a busbar frame including an upper end busbar frame and a lower end busbar frame that are arranged on at least one side of a plurality of battery cells and can be separated and coupled, a plurality of through-holes through which electrode leads of a plurality of battery cells pass, and a plurality of busbars arranged opposite the plurality of through-holes and electrically connected to the plurality of electrode leads, and a battery module including the same.

Description

[Technical field]

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0154630 filed on November 17, 2022, and all contents disclosed in the Korean Patent Application are incorporated herein by reference.

[0002] The present invention relates to a battery module including a top and bottom separated bus bar frame and a method for assembling the same, and more particularly to a bus bar frame separable into top and bottom ends for easily inserting electrode leads of battery cells into slits provided in the bus bar frame, and a method for assembling a battery module using the bus bar frame separated into the top and bottom ends. [Background technology]

[0003] Recently, the demand for secondary batteries that can store electric energy produced by the development of alternative energy sources due to air pollution caused by the use of fossil fuels and energy depletion is increasing. Secondary batteries that can be charged and discharged are closely used in daily life such as mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Secondary batteries are classified into cylindrical, square, and pouch-type secondary batteries according to the structure of the electrode assembly. Among them, the use of pouch-type secondary batteries is gradually increasing because it is possible to obtain a high-capacity and high-density secondary battery, and it is possible to have low manufacturing costs, small weight, and various shapes. In such pouch-type secondary batteries (hereinafter referred to as "battery cells"), a difference in adhesive strength between the electrodes and separator inside the cell occurs during charging / discharging and activation processes for stabilization, which can cause a bending phenomenon in which the electrode leads bend or sag.

[0005] Therefore, it is not easy to insert the deformed electrode leads into the slits of the bus bar frame in order to assemble the battery module. In particular, if the electrode leads are not properly arranged, they must be manually rearranged and inserted into the slits each time during the assembly process, which is a problem.

[0006] In this regard, Patent Document 1 discloses a means for easily inserting the electrode leads of the battery cells into the bus bar frame by providing a guide groove at the lower end of the bus bar frame.

[0007] Fig. 1 is a diagram showing the structure of a busbar frame with a guide groove for easily assembling battery cells according to Patent Document 1, which is a conventional technology. Referring to Fig. 1, a portion "A" shown at the bottom of the busbar frame is a guide groove with a narrow width, which serves as a passage for easily inserting a protrusion formed at the bottom end of a battery cell into a slit provided in the busbar frame. However, there is a problem in that the guide groove for guiding the protrusion extends unnecessarily to the bottom of the busbar frame.

[0008] In addition, it remains difficult to insert the electrode leads into the slits of the bus bar frame when the electrode leads are not in the correct position during the assembly process of the bus bar frame. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Korean Patent Publication No. 10-2022-0109031 Summary of the Invention [Problem to be solved by the invention]

[0010] In order to solve the above problems, an object of the present invention is to provide a battery module including an upper and lower end separated bus bar frame having a structure in which the bus bar frame can be separated into upper and lower ends so that electrode leads of a battery cell can be easily inserted and then reassembled after the electrode leads are inserted, and a method of assembling the same. [Means for solving the problem]

[0011] In order to achieve the above object, a battery module according to the present invention includes a cell assembly (300) including a plurality of battery cells (310) arranged to be stacked in at least one direction, each of the battery cells having a plurality of electrode leads (320), at least one bus bar frame assembly (100) connecting the plurality of electrode leads (320) and a bus bar (150) to each other, and a battery module (10) accommodating a cell stack assembly including the cell assembly (300) and the bus bar frame assembly (100), The busbar frame assembly (100) includes a busbar frame (110) arranged on at least one side of the plurality of battery cells (310) and consisting of a separable upper busbar frame (120) and a lower busbar frame (130), a plurality of through-holes (140) provided on the busbar frame (110) and through which electrode leads (320) of the plurality of battery cells (310) pass, and a plurality of busbars (150) arranged opposite the plurality of through-holes (140) and electrically connected to the plurality of electrode leads (320).

[0012] In addition, in the battery module according to the present invention, the electrode lead (320) is characterized in that it penetrates and protrudes through the penetration portion (140) provided in the bus bar frame (110) and the lead insertion portion 154 of the bus bar (150).

[0013] In the battery module according to the present invention, the bus bar (150) is fastened to the upper bus bar frame (120) and the lower bus bar frame (130).

[0014] In addition, in the battery module according to the present invention, the bus bar (150) has a space into which the electrode lead (320) is inserted and has a U-shape with one side open.

[0015] In addition, in the battery module according to the present invention, the bus bar (150) is characterized in that it has a space into which the electrode lead (320) is inserted and has a square shape with one side closed.

[0016] In addition, in the battery module according to the present invention, the bus bar (150) includes at least one upper end fastening hole (122) for fastening to the upper end bus bar frame (120) with a bolt, and at least one lower end fastening hole (132) for fastening to the lower end bus bar frame (130) with a bolt.

[0017] In addition, in the battery module according to the present invention, the through-hole (140) is formed by combining an upper end through-hole (141) of the upper bus bar frame (120) and a lower end through-hole (142) of the lower bus bar frame (130).

[0018] In addition, the battery module according to the present invention is characterized in that the through-hole (140) is provided only in the upper bus bar frame (120).

[0019] In addition, the method of assembling a battery module according to the present invention includes a first step of fixing electrode leads (320) of a plurality of battery cells (310) in a vertical direction to a bus bar frame (110), a second step of fixing a plurality of bus bars (150) facing upper end through-holes (141) of an upper bus bar frame (120), and a third step of lowering the upper end through-holes (141) of the upper bus bar frame (120) between the electrode leads (320). a fourth step of inserting the electrode lead (320) into the lower end through-hole (142) of the lower end bus bar frame (130); a fifth step of fixing the lower end bus bar frame (130) to the upper end bus bar frame (120); a sixth step of fixing the plurality of bus bars (150) to the lower end bus bar frame (130); and a seventh step of electrically connecting the electrode lead (320) to the bus bars (150).

[0020] In addition, the method for assembling a battery module according to the present invention is characterized in that in the first step, a plurality of battery cells (130) are aligned using a jig.

[0021] In the method for assembling a battery module according to the present invention, the second step is performed in a sixth step.

[0022] In addition, in the method of assembling a battery module according to the present invention, when the lower bus bar frame (130) does not include the lower end through-hole (142), the fourth step may be omitted. Effect of the Invention

[0023] As described above, according to the battery module including the top and bottom separate bus bar frame and the method for assembling the same according to the present invention, difficulties may arise when directly inserting bent electrode leads into grooves (slits) provided in the bus bar frame. However, by using a bus bar frame that is separable at the top and bottom, the electrode leads that are vertically aligned can be inserted from above, which has the advantage that they can be easily inserted without interference. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a diagram showing a structure of a busbar frame having guide grooves for easily assembling battery cells according to the prior art. [Diagram 2] FIG. 2 is an exploded perspective view showing a schematic structure of a battery module. [Diagram 3] 1 is a perspective view of a battery cell mounted in a battery module according to a first preferred embodiment of the present invention; [Figure 4] FIG. 1 is a perspective view of a bus bar frame assembly according to a first preferred embodiment of the present invention. [Diagram 5] FIG. 5 is an exploded perspective view of the bus bar frame assembly of FIG. 4. [Figure 6] FIG. 1 is a perspective view of a bus bar according to a first preferred embodiment of the present invention. [Figure 7] 1A and 1B are a front view and a side view showing, as an example, a state before assembly of a bus bar frame assembly according to a first preferred embodiment of the present invention. [Figure 8] 1 is a diagram illustrating an assembled state of a bus bar frame assembly according to a first preferred embodiment of the present invention; [Figure 9] 11A to 11C are diagrams showing the structure of an upper end bus bar frame and a lower end bus bar frame according to a second preferred embodiment of the present invention. [Figure 10] 11A and 11B are a front view and a side view showing, as an example, a state before assembly of a bus bar frame assembly according to a second preferred embodiment of the present invention. [Figure 11] 11 is a diagram illustrating an assembled state of a bus bar frame assembly according to a second preferred embodiment of the present invention; FIG. [Figure 12] FIG. 13 is a diagram illustrating an assembled state of a bus bar frame assembly according to a third preferred embodiment of the present invention. [Figure 13] FIG. 11 is a perspective view of a bus bar according to a third preferred embodiment of the present invention. [Figure 14]13A and 13B are a front view and a side view showing, as an example, a state before assembly of a bus bar frame assembly according to a third preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, in which a person having ordinary skill in the art to which the present invention pertains can easily carry out the present invention. However, when describing the operation principle of the preferred embodiment of the present invention in detail, detailed description of related well-known functions or configurations will be omitted if it is determined that such detailed description may unnecessarily obscure the gist of the present invention.

[0026] In addition, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only the case where the part is directly connected to another part, but also the case where the part is indirectly connected via another element in between. In addition, when a part includes a certain element, it does not mean that the other element is excluded, but that the part may further include the other element, unless otherwise specified.

[0027] FIG. 2 is an exploded perspective view showing a schematic structure of the battery module.

[0028] Referring to FIG. 2 , the battery module 10 includes a cell assembly 300 in which a plurality of battery cells 310, each including an electrode lead 320, are arranged in a row, an upper frame 200 located on the upper part of the cell assembly 300, a bus bar frame assembly 100 located on the side and fixed by connecting the electrode lead 320 to a bus bar 150, and a mono frame 400 and a side frame 500 surrounding these on the outside, all of which are combined to complete a single battery module 10.

[0029] The side frames may use steel or aluminum for structural rigidity of the battery module, or may use a plastic structure for weight reduction and structural simplicity.

[0030] The monoframe may have any one of a cover structure, a U-shaped frame, and a CTP (cell to pack) structure. The monoframe may be applied as a structure in which the upper and lower parts of the battery module are open and only a plate is coupled to the outermost edge in the stacking direction of the battery cells.

[0031] The battery module 10 shown in FIG. 2 is an example of only a basic configuration, and can be modified in various ways by ordinary engineers, so it is not limited thereto. The structure and technical features of the bus bar frame assembly 100 will be described in detail below with reference to the drawings.

[0032] 3 is a perspective view of a battery cell mounted in a battery module according to a first preferred embodiment of the present invention. As shown in FIG 3, the battery cell 310 includes a cell case 340, an electrode assembly (not shown) housed inside the cell case 340, a sealing part 330 provided on an edge of the cell case 340, a pair of electrode tabs (not shown), and a pair of electrode leads 320 electrically connected to the electrode tabs at one side and protruding out of the cell case 340 at the other side.

[0033] In particular, the cell casing 340 uses a laminate sheet consisting of an outer coating layer, a metal layer, and an inner coating layer to form a space capable of housing the electrode assembly.

[0034] Also, the electrode leads 320 may be electrically connected in series or in parallel via the bus bar. However, the cell case 340 made of a laminate sheet may experience a swelling phenomenon in which gas is generated during the activation process, or may experience bending during the process of producing the electrode assembly, which may cause the electrode leads 320 to bend. Therefore, it may be difficult to insert the electrode leads 320 into a slit (a hole for inserting an electrode lead) provided in the bus bar frame to connect with the bus bar.

[0035] Although the drawings show a bidirectional battery cell in which the electrode leads 320 face each other, the battery cell may be a unidirectional battery cell in which the pair of electrode leads 320 are arranged in the same direction. However, in the case of a unidirectional battery cell, the bus bar frame assembly 100 must be located on one side.

[0036] Fig. 4 is a perspective view of a bus bar frame assembly 100 according to a first preferred embodiment of the present invention, and Fig. 5 is an exploded perspective view of the bus bar frame assembly 100 of Fig. 4. Also, Fig. 6 is a perspective view of a bus bar 150 according to the first preferred embodiment of the present invention.

[0037] As shown in FIG. 4 , the bus bar frame assembly 100 is a single frame assembly for electrically connecting electrode leads 320 provided on a plurality of battery cells 310 in series or in parallel via a plurality of bus bars 150, and can be connected to one monoframe 400.

[0038] In addition, although not specifically shown in Fig. 4, various sensors (such as a temperature sensor, an electrolyte leakage sensor, a current sensor, etc.) and means for controlling them may be further provided. However, since these configurations correspond to technical configurations that are already known, detailed illustrations and descriptions thereof will be omitted in the present invention.

[0039] Although the drawings show a lattice-shaped space in the bus bar frame assembly 100, this is merely one example and any number of variations are possible, and although the connection means between the multiple bus bars 150 are not shown, a person of ordinary skill in the art would be able to easily understand the connection means between these bus bars 150.

[0040] In the busbar frame assembly 100 according to the first embodiment of the present invention, the busbar frame 110 includes an upper busbar frame 120 located at the upper end and a lower busbar frame 130 located at the lower end, and these upper and lower busbar frames 120, 130 are separable and connectable to each other.

[0041] 4 and 5, the upper and lower bus bar frames 120, 130 have a plurality of spaces through which the electrode leads 320 can pass. The upper bus bar frame 120 has an upper end through-portion 141, and the lower bus bar frame 130 has a lower end through-portion 142.

[0042] In addition, when the upper and lower bus bar frames 120, 130 are coupled, the upper through-hole 141 and the lower through-hole 142 are coupled to form a rectangular space into which the electrode lead 320 can be inserted. In addition, although the number of electrode leads 320 protruding from the through-hole 140 is not explicitly shown in the drawings, at least one electrode lead may protrude therefrom, and this is not intended to be limiting.

[0043] 4 is for connecting a plurality of electrode leads 320 in series or in parallel. The bus bar 150 is a conductor having low impedance, high current capacity, and good electrical conductivity, such as copper or aluminum, and a plurality of bus bars 150 are arranged side by side in the direction in which the plurality of cells 310 are stacked.

[0044] 4 to 6 according to the first embodiment has a U-shaped plate structure of uniform thickness with an open space 154 on one side, and includes a busbar body 151 and upper and lower busbar fastening holes 152 and 153 for fastening upper and lower busbar frames 120, 130 to busbar 150 with bolts. Here, lead insertion portion 154, which is the open space, is a space into which electrode lead 320 is inserted, and busbar body 151 is electrically connected to the penetrated electrode lead 320 by a process such as welding.

[0045] In addition, the illustrated bus bars 150 are merely an example and are not limited thereto, and may be modified and embodied in various structures that allow electrical connection. Although the drawing does not show a means for connecting the bus bars 150, a detailed description thereof will be omitted since a person skilled in the art can easily connect the bus bars 150 in series / parallel using a separate inter-bus bar for electrical connection between the bus bars 150.

[0046] Figure 7 shows an example of a state before assembly of a bus bar frame assembly 100 according to a first preferred embodiment of the present invention, where Figure 7(a) is a side view seen in the X-axis direction of Figure 4, and Figure 7(b) is a front view seen in the Y-axis direction of Figure 4. Figure 8 is a view showing the bus bar frame assembly 100 according to the first preferred embodiment of the present invention in an assembled state.

[0047] 7(a) and 7(b), before inserting the electrode lead 320, the upper bus bar frame 120 fastens the bus bar 150 with a bolt 155. Here, the lead insertion portion 154 of the bus bar 150 is positioned opposite the upper through-hole portion 141, which is a space provided in the upper bus bar frame 120.

[0048] In order to insert one electrode lead 320, the upper through-hole 141 of the upper bus bar frame 120 is fitted while moving from the top to the electrode lead 320 located below. Also, after the upper bus bar frame 120 is fitted first, the lower bus bar frame 130 is further moved downward or to the front, whereby the electrode lead 320 is inserted.

[0049] FIG. 8 shows the shape of the upper and lower bus bar frames 120, 130 of FIG. 7 fastened together after the insertion of the electrode lead 320, and the bus bar 150 is fastened to the lower bus bar frame 130 with a bolt through the lower bus bar fastening hole 153.

[0050] In addition, although not shown in FIG. 8, the upper busbar frame 120 and the lower busbar frame 130 may also be fixed by fastening with bolts or the like, and the fastening method between the upper and lower busbar frames 120, 130 is not limited and may be implemented in various forms.

[0051] FIG. 9 is a diagram showing the structure of an upper end bus bar frame 160 and a lower end bus bar frame 170 according to the second preferred embodiment of the present invention.

[0052] As shown in FIG. 9, compared to the busbar frame assembly 100 according to the first embodiment, the busbar frame assembly 100 according to the second embodiment of the present invention is similar to the busbar frame 110 in that it can be separated and coupled to the busbar 150, the upper busbar frame 120 located at the upper end, and the lower busbar frame 130 located at the lower end, and has upper and lower fastening holes 162, 172 for fastening the busbar 150.

[0053] However, according to the second embodiment of the present invention, only the upper bus bar frame 160 has the upper through-hole 161, which is a space through which the electrode lead 320 can penetrate, and no separate space is provided in the lower bus bar frame 170. Here, the upper through-hole 161 must have a size equal to or larger than the space through which the electrode lead 320 can be fully inserted.

[0054] In addition, the configurations of the bus bar 150 and the upper and lower fastening holes 162, 172 provided in the bus bar frame 160 according to the second embodiment are similar to those of the bus bar frame 110 according to the first embodiment, so that a duplicated description will be omitted.

[0055] Figure 10 is a diagram showing an example of a state before assembly of a bus bar frame assembly 100 according to a second preferred embodiment of the present invention, where Figure 10(a) is a side view seen in the X-axis direction of Figure 4, and Figure 10(b) is a front view seen in the Y-axis direction of Figure 4. Figure 11 is a diagram showing the bus bar frame assembly 100 according to the second preferred embodiment of the present invention in an assembled state, and repeated explanations will be omitted.

[0056] 10, the upper bus bar frame 160 has a similar fastening form to the upper bus bar frame 120 according to the first embodiment of FIG 7, so a duplicated description will be omitted. However, since the lower bus bar frame 170 does not have a space through which the electrode leads 320 of the battery cells 310 pass, it is sufficient to simply fasten the bus bar 150 to the upper bus bar frame 160.

[0057] As described above, the first embodiment is characterized in that the upper and lower busbar frames 120, 130 are separated at the middle portion of the electrode lead 320, and therefore the electrode lead 320 must be fastened to both the upper and lower busbar frames 120, 130. However, in the upper and lower busbar frames 160, 170 according to the second embodiment, it is sufficient to fasten the electrode lead 320 only to the upper busbar frame 160.

[0058] FIG. 12 is a view illustrating an assembled state of a bus bar frame assembly according to a third preferred embodiment of the present invention, and FIG. 13 is a perspective view of a bus bar 180 according to the third preferred embodiment of the present invention.

[0059] The upper busbar frames 120, 160 of the busbar frame 110 according to the first and second embodiments of the present invention are characterized in that the busbar 150 is first fastened and then the electrode lead 320 is inserted. However, as shown in Fig. 12, the third embodiment of the present invention has a structure in which the upper and lower busbar frames 120, 130 are joined together first and then the busbar 180 is fastened.

[0060] 13, busbar 180 according to the third embodiment of the present invention has a square shape and includes busbar body 181 having one lead insertion portion 184 which is a rectangular through-space, and includes upper and lower busbar fastening holes 182, 183 for fastening to busbar frame 110. However, busbar 180 of the third embodiment is not limited thereto and may be replaced with U-shaped busbar 150 according to the first and second embodiments.

[0061] 14A and 14B are diagrams showing an example of a state before assembly of a bus bar frame assembly 100 according to a third preferred embodiment of the present invention, in which FIG. 14A is a side view seen in the X-axis direction of FIG. 4, and FIG. 14B is a front view seen in the Y-axis direction of FIG. 4.

[0062] 14, compared to the assembled state according to the first embodiment shown in Fig. 7, there is a difference in that the upper bus bar frame 120 and the lower bus bar frame 130 are first coupled together, and then the electrode leads 320 of the battery cells 310 penetrate the bus bar 150. In addition, the process of inserting and fastening the electrode leads 320 into the bus bar frame 110 is the same as the configuration shown in Fig. 7, so a repeated description will be omitted.

[0063] A method for assembling a battery module according to a first preferred embodiment of the present invention includes a first step of fixing electrode leads 320 provided on a plurality of battery cells 310 vertically to the busbar frame 110 so that the electrode leads 320 can pass through the through-portions 140 of the busbar frame 110; a second step of fixing a plurality of busbars 150 facing the upper end through-portions 141 provided on the upper end busbar frame 120; a third step of fitting the upper end through-portions 141 of the upper end busbar frame 120 downwardly between the electrode leads 320; a fourth step of inserting the electrode leads 320 into the lower end through-portions 142 of the lower end busbar frame 130; a fifth step of fixing the lower end busbar frame 130 to the upper end busbar frame 120; a sixth step of fixing a plurality of busbars 150 to the lower end busbar frame 130; and a seventh step of electrically connecting the electrode leads 320 to the busbars 150.

[0064] Also, in the first stage, the multiple battery cells 310 may be pre-assembled and aligned in a jig.

[0065] Meanwhile, in the case of the third embodiment, the step of fixing the bus bar 150 to the upper bus bar frame 120 in the second step may be simultaneously performed in the fifth step.

[0066] In the case of the second embodiment described above, that is, when the lower bus bar frame 130 does not have the lower end through-hole 142, the fourth step can be omitted.

[0067] In addition, after the seventh step, a step of combining the upper frame 200, the mono frame 400 and the side frame 500 to complete a single battery module 10 is further included, but since this is an assembly step that can be easily performed by a person with ordinary skill in the art, a detailed description thereof will be omitted.

[0068] Although the present invention has been described above with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications and variations of the present invention may be made within the scope of the present invention based on the above description. [Explanation of symbols]

[0069] 10 Battery Module 100 Busbar Frame Assembly 110 Busbar frame 120, 160 Top busbar frame 122, 162 Upper end fastening hole 130, 170 Lower bus bar frame 132, 172 Lower end fastening hole 140 Penetration 141, 161 Upper end penetration part 142 Lower end penetration part 150, 180 busbar 151, 181 Busbar body 152, 182 Upper busbar fastening holes 153, 183 Lower end busbar fastening holes 154, 184 Lead insertion section 155 Fastening bolt 200 Upper Frame 300 Cell Assembly 310 Battery Cell 320 Electrode Lead 330 Sealing section 340 Cell Case 400 Monoframe 500 Side Frame

Claims

1. A battery module including a cell assembly including a plurality of battery cells arranged to be stacked in at least one direction, the battery cells including a plurality of electrode leads, at least one bus bar frame assembly connecting the plurality of electrode leads and a bus bar to each other, and a cell stack assembly including the cell assembly and the bus bar frame assembly, The bus bar frame assembly includes: a bus bar frame disposed on at least one side of the plurality of battery cells, the bus bar frame including a separable upper end bus bar frame and a separable lower end bus bar frame; a plurality of through-holes provided in the bus bar frame, through which electrode leads of the plurality of battery cells pass; a plurality of bus bars disposed opposite the plurality of through-holes and electrically connected to the plurality of electrode leads.

2. The battery module according to claim 1 , wherein the electrode leads protrude through penetration portions provided in the bus bar frame and lead insertion portions of the bus bars.

3. The battery module according to claim 1 , wherein the busbars are fastened to the upper busbar frame and the lower busbar frame.

4. The battery module of claim 1 , wherein the bus bar has a U-shape with one side open and includes a space into which an electrode lead is inserted.

5. The battery module according to claim 1 , wherein the bus bar has a space into which an electrode lead is inserted and has a square shape with one side closed.

6. 5. The battery module of claim 4, wherein the busbars include at least one upper fastening hole for fastening to the upper busbar frame with a bolt and at least one lower fastening hole for fastening to the lower busbar frame with a bolt.

7. The battery module of claim 1 , wherein the through-portion is formed by combining an upper end through-portion of the upper bus bar frame and a lower end through-portion of the lower bus bar frame.

8. The battery module according to claim 1 , wherein the through-hole is provided only in the upper end bus bar frame.

9. A method for assembling the battery module according to any one of claims 1 to 8, comprising the steps of: A first step of fixing electrode leads provided on a plurality of battery cells to a bus bar frame in a vertical direction; a second step of fixing the bus bars to face the upper end through-holes provided in the upper end bus bar frame; a third step of fitting the upper end through-hole of the upper end bus bar frame downward between the electrode leads; a fourth step of inserting the electrode lead into a lower end through-portion of a lower end bus bar frame; a fifth step of fixing the lower end bus bar frame to the upper end bus bar frame; a sixth step of fixing the bus bars to a lower bus bar frame; and a seventh step of electrically connecting the electrode leads to the bus bars.

10. The method of assembling a battery module according to claim 9 , wherein in the first step, the plurality of battery cells are aligned using a jig.

11. The method of assembling a battery module according to claim 9 , wherein the second step is performed in the sixth step.

12. The method of assembling a battery module according to claim 9 , wherein the fourth step is omitted when the lower end bus bar frame does not include the lower end through-hole.

13. A battery pack comprising at least one battery module according to claim 1.

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