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 based on Korean Patent Application No. 10-2022-0154630, filed 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 bus bar frame separated into upper and lower ends and a method for assembling the same, and more particularly to a bus bar frame separable into upper and lower ends for easily inserting electrode leads of battery cells into slits formed in the bus bar frame, and a method for assembling a battery module using the bus bar frame separated into upper and lower ends. [Background technology]

[0003] Recently, there has been an increasing demand for secondary batteries that can store electrical energy produced by the development of alternative energy sources due to air pollution caused by the use of fossil fuels and energy depletion.Rechargeable secondary batteries are widely used in everyday life, such as in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Secondary batteries are classified into cylindrical, prismatic, and pouch-type secondary batteries depending on the structure of the electrode assembly. Among them, pouch-type secondary batteries are increasingly being used because they can provide high-capacity and high-density secondary batteries, have low manufacturing costs, are lightweight, and can be made in a variety of 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 charge / discharge 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 when assembling 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 guide grooves at the lower end of the bus bar frame.

[0007] Figure 1 is a diagram showing the structure of a bus bar frame with a guide groove for easily assembling battery cells according to Patent Document 1, which is a conventional technology. Referring to Figure 1, the portion "A" shown at the bottom of the bus bar frame is a guide groove that narrows in width and serves as a passage for easily inserting protrusions formed at the bottom ends of battery cells into slits in the bus bar frame. However, there is a problem in that the guide groove for guiding the protrusions extends unnecessarily to the bottom of the bus bar frame.

[0008] Furthermore, during the assembly process of the bus bar frame, it remains difficult to insert the electrode lead into the slit of the bus bar frame if the electrode lead is out of position. [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 to facilitate insertion of electrode leads of battery cells and can be reassembled after inserting electrode leads, and a method of assembling the same. [Means for solving the problem]

[0011] To achieve the above object, the 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 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 bus bar frame assembly (100) is characterized by including: a bus bar frame (110) arranged on at least one side of the plurality of battery cells (310) and consisting of a separable upper bus bar frame (120) and lower bus bar frame (130); a plurality of through-holes (140) provided on the bus bar frame (110) and through which electrode leads (320) of the plurality of battery cells (310) pass; and a plurality of bus bars (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 by penetrating through the through-hole (140) provided in the bus bar frame (110) and the lead insertion portion 154 of the bus bar (150) and projecting.

[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 is U-shaped with one side open.

[0015] 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 is shaped like a square 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 the upper end through-hole (141) of the upper bus bar frame (120) and the 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-holes (140) are provided only in the upper bus bar frame (120).

[0019] In addition, the method for assembling a battery module according to the present invention includes a first step of fixing electrode leads (320) provided on 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) provided on an upper bus bar frame (120), and a second step of inserting the upper end through-holes (141) of the upper bus bar frame (120) downward between the electrode leads (320). a fourth step of inserting the electrode leads (320) into the lower end through-holes (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 leads (320) to the bus bars (150).

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

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

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

[0023] As described above, according to the battery module including the upper and lower end separable bus bar frame and the method for assembling the same according to the present invention, it can be difficult to directly insert bent electrode leads into grooves (slits) formed in the bus bar frame. However, by using a bus bar frame that can be separated at the upper and lower ends, it is possible to insert the electrode leads from above the vertically aligned electrode leads, which has the advantage of facilitating insertion without interference. [Brief explanation of the drawings]

[0024] [Figure 1] 1A and 1B are diagrams showing the structure of a busbar frame having guide grooves for easily assembling battery cells according to the prior art; [Figure 2] FIG. 2 is an exploded perspective view showing a schematic structure of the battery module. [Figure 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] 1 is a perspective view of a bus bar frame assembly according to a first preferred embodiment of the present invention; [Figure 5] FIG. 5 is an exploded perspective view of the bus bar frame assembly of FIG. 4. [Figure 6] 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] 10A and 10B are diagrams showing the structure of an upper bus bar frame and a lower bus bar frame according to a second preferred embodiment of the present invention. [Figure 10] 10A and 10B 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] 10A and 10B are diagrams illustrating an assembled state of a bus bar frame assembly according to a second preferred embodiment of the present invention; [Figure 12] 10A and 10B are diagrams illustrating an assembled state of a bus bar frame assembly according to a third preferred embodiment of the present invention; [Figure 13] FIG. 10 is a perspective view of a bus bar according to a third preferred embodiment of the present invention. [Figure 14]10A and 10B 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 INVENTION

[0025] Hereinafter, with reference to the accompanying drawings, a detailed description will be given of an embodiment of the present invention that will enable a person skilled in the art to easily carry out the present invention. However, in 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] Furthermore, the same reference numerals are used throughout the drawings for parts that have similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element between them. Furthermore, unless otherwise specified, "including" a certain element does not exclude other elements but means that other elements may also be included.

[0027] FIG. 2 is an exploded perspective view showing the 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 positioned on top of the cell assembly 300, a bus bar frame assembly 100 positioned on the side and fixedly connecting the electrode leads 320 to a bus bar 150, and a mono frame 400 and a side frame 500 surrounding the above on the outside, and all of these are combined to complete a single battery module 10.

[0029] The side frame may be made of steel or aluminum for structural rigidity of the battery module, or may be made of plastic for weight reduction and structural simplicity.

[0030] The monoframe may have any one of a cover structure, a U-shaped frame, or a CTP (Cell to Pack) structure. The monoframe may have an open top and bottom portion of the battery module, and only plates may be attached to the outermost portion of the battery cell stacking direction.

[0031] The battery module 10 shown in FIG. 2 is an example of only the basic configuration, and various modifications can be made by ordinary engineers, so it is not limited to this. 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 to be 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 portion 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 on one side and protruding outside the cell case 340 on the other side.

[0033] In particular, the cell case 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 accommodating the electrode assembly.

[0034] The electrode leads 320 may be electrically connected in series or in parallel via the bus bar. However, the cell case 340, which is made of a laminate sheet, may experience swelling due to gas generation during the activation process or bending during the process of manufacturing the electrode assembly, which may cause the electrode leads 320 to bend. Therefore, it may be difficult to insert the electrode leads 320 into the slits (holes for inserting the electrode leads) provided in the bus bar frame for connection to the bus bar.

[0035] Although the drawings show a bidirectional battery cell in which the electrode leads 320 are positioned facing each other, the battery cell may be a unidirectional battery cell in which a pair of electrode leads 320 are arranged in the same direction. However, in the unidirectional case, the bus bar frame assembly 100 must be positioned 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, Fig. 5 is an exploded perspective view of the bus bar frame assembly 100 of Fig. 4, and 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 mono-frame 400.

[0038] 4, various sensors (such as a temperature sensor, an electrolyte leakage sensor, and a current sensor) and means for controlling them may be further provided. However, since these components correspond to technical components 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 an example and any number of modifications are possible. 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 bus bar frame assembly 100 according to the first embodiment of the present invention, the bus bar frame 110 includes an upper bus bar frame 120 located at the upper end and a lower bus bar frame 130 located at the lower end, and these upper and lower bus bar frames 120, 130 can be separated and connected to each other.

[0041] 4 and 5, the upper and lower bus bar frames 120 and 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, the number is not limited thereto as at least one electrode lead may protrude.

[0043] 4 is used to connect a plurality of electrode leads 320 in series or in parallel. The bus bar 150 is a conductor made of a metallic material such as copper or aluminum that has low impedance, high current capacity, and good electrical conductivity, 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, bus bar 150 according to the first embodiment has a U-shaped plate structure of uniform thickness with an open space 154 on one side, and includes bus bar body 151 and upper bus bar fastening holes 152 and lower bus bar fastening holes 153 for fastening upper and lower bus bar frames 120 and 130 to bus bar 150 with bolts. Here, lead insertion portion 154, which is the open space, is a space into which electrode lead 320 is inserted, and bus bar body 151 is electrically connected to the passed-through electrode lead 320 by a process such as welding.

[0045] In addition, the bus bars 150 shown in the drawings are merely an example and are not limited thereto, and may be modified and implemented with various structures that allow electrical connection. Although the drawings do not show means for connecting the bus bars 150, connecting the bus bars 150 in series / parallel using separate inter-bus bars or the like for electrical connection between the bus bars 150 is well within the skill of an ordinary engineer, and therefore detailed description thereof will be omitted.

[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 bus bar 150 is fastened to the upper bus bar frame 120 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 by moving from the top to the electrode lead 320 located below. After the upper bus bar frame 120 is fitted first, the lower bus bar frame 130 is further moved downward or to the front to insert the electrode lead 320.

[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] Although not shown in FIG. 8, the upper bus bar frame 120 and the lower bus bar frame 130 may also be fastened together using bolts or the like, and the fastening method between the upper and lower bus bar 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 bus bar frame 160 and a lower bus bar frame 170 according to a second preferred embodiment of the present invention.

[0052] As shown in FIG. 9, the bus bar frame assembly 100 according to the second embodiment of the present invention is similar to the bus bar frame 110 in that it can be separated and combined into an upper bus bar frame 120 located at the upper end and a lower bus bar frame 130 located at the lower end of the bus bar 150, and has upper and lower fastening holes 162, 172 for fastening the bus bar 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 pass, and no separate space is provided in the lower bus bar frame 170. Here, the upper through-hole 161 must be large enough to provide a space through which the electrode lead 320 can be inserted.

[0054] Furthermore, the bus bar 150 and the upper and lower end fastening holes 162, 172 provided in the bus bar frame 160 according to the second embodiment have the same configuration as the bus bar frame 110 according to the first embodiment, and therefore, a duplicated description will be omitted.

[0055] Figure 10 shows 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 shows a state in which the bus bar frame assembly 100 according to the second preferred embodiment of the present invention is assembled, and redundant explanations will be omitted.

[0056] 10, the upper bus bar frame 160 has the same fastening configuration as the upper bus bar frame 120 according to the first embodiment of FIG. 7, and therefore a repeated 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 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 bus bar frames 120, 130 are separated at the middle of the electrode lead 320, and therefore the electrode lead 320 must be fastened to both the upper and lower bus bar frames 120, 130. However, in the second embodiment, the upper and lower bus bar frames 160, 170 are sufficient if the electrode lead 320 is fastened only to the upper bus bar 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 bus bar frames 120, 160 of the bus bar frame 110 according to the first and second embodiments of the present invention are characterized in that the bus bar 150 is fastened first 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 bus bar frames 120, 130 are joined first and then the bus bar 180 is fastened.

[0060] 13, bus bar 180 according to the third embodiment of the present invention has a square shape and includes bus bar body 181 with lead insertion portion 184, which is a rectangular through-hole, and upper and lower bus bar fastening holes 182 and 183 for fastening to bus bar frame 110. However, bus bar 180 of the third embodiment is not limited to this and can be replaced with U-shaped bus bar 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, the difference is 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 bars 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 the following steps: a first step of fixing electrode leads 320 of a plurality of battery cells 310 vertically to the bus bar frame 110 so that the electrode leads 320 can pass through the through-holes 140 of the bus bar frame 110; a second step of fixing a plurality of bus bars 150 facing the upper through-holes 141 of the upper bus bar frame 120; a third step of fitting the upper through-holes 141 of the upper bus bar frame 120 downward between the electrode leads 320; a fourth step of inserting the electrode leads 320 into the lower through-holes 142 of the lower bus bar frame 130; a fifth step of fixing the lower bus bar frame 130 to the upper bus bar frame 120; a sixth step of fixing the plurality of bus bars 150 to the lower bus bar frame 130; and a seventh step of electrically connecting the electrode leads 320 to the bus bars 150.

[0064] In addition, in the first stage, the plurality of battery cells 310 may be pre-assembled by aligning them in a jig.

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

[0066] In the case of the second embodiment described above, that is, when the lower end 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 an ordinary technician, 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 within the scope of the present invention may be made based on the above teachings. [Explanation of symbols]

[0069] 10 Battery Module 100 Busbar Frame Assembly 110 Busbar Frame 120, 160 upper bus bar frame 122, 162 upper fastening holes 130, 170 Lower bus bar frame 132, 172 Lower end fastening holes 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 busbar fastening holes 154, 184 Lead insertion section 155 Fastening bolt 200 Upper Frame 300 Cell Assembly 310 battery cells 320 Electrode Lead 330 Sealing section 340 Cell Case 400 Monoframe 500 side frame

Claims

1. A battery module containing a cell assembly including a plurality of battery cells arranged to be stacked in at least one direction, each cell assembly having 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 bus bar is fastened to the upper bus bar frame and the lower bus bar 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 square shape with one side closed, the square shape including a space into which an electrode lead is inserted.

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

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

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

9. A method for assembling the battery module according to any one of claims 1 to 8, comprising: 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 plurality of 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 bus bar frame to the upper bus bar frame; a sixth step of fixing the plurality of 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 bus bar frame does not include the lower end through-hole.

13. A battery pack comprising at least one battery module according to any one of claims 1 to 8.

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