CELL STACK ASSEMBLY AND BATTERY PACK INCLUDING SAME - Patent application

Abstract

The present invention relates to a cell stack assembly and a battery pack including the same, the cell stack assembly including a cell stack having electrode leads led out to both sides, a bus bar frame including a bus bar electrically connected to the electrode leads and attached to front and rear sides of the cell stack, a first side beam coupled to one end of the bus bar frame to support one side of the cell stack, and a second side beam coupled to the other end of the bus bar frame to support the other side of the cell stack, the first side beam including a support part supporting one side of the cell stack and a plate-shaped pressure part formed at the end of the support part and perpendicular to the support part. The battery pack accommodating the cell stack assembly includes a pack case providing a space in which the cell stack assembly is seated, and the pair of cell stack assemblies are seated in the pack case such that the first side beam of one cell stack assembly is coupled to the second side beam of the other cell stack assembly.

Description

[Technical field]

[0001] The present invention relates to a cell stack assembly and a battery pack including the cell stack assembly. More specifically, the present invention provides a cell stack assembly including a side beam structure that applies pressure to upper portions of a plurality of cells, and a battery pack in which the support force of the cell stack assembly accommodated by the side beam structure is improved.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0167130 dated December 2, 2022 and Korean Patent Application No. 10-2023-0037378 dated March 22, 2023, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference. [Background technology]

[0003] The types of secondary batteries include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.2V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Also, a battery pack may be configured by connecting a number of battery cells in parallel according to a charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge / discharge capacity.

[0004] For example, when a battery pack is formed by connecting a plurality of battery cells in series / parallel, a battery module made up of the plurality of battery cells is first formed.

[0005] 1 is a perspective view of a cell stack assembly 10 in which cells 30 are exposed to the outside, illustrating one example of a conventional battery module. The cell stack assembly 10 shown in FIG 1 has electrode leads extending from both sides, and bus bar frames 50 covering the electrode leads are coupled to the front and rear of a plurality of cells 30 stacked in one direction.

[0006] The configuration shown in FIG. 1 is a structure that omits a module frame that surrounds and protects the internal cells 30, and has an advantage of being lighter in weight than the existing battery module that surrounds and seals the cells 30.

[0007] FIG. 2 above is an oblique view and a front view of a conventional cell stack assembly 10 in which side beams 40 are connected to both sides to support the sides of the cell stack 20, and FIG. 3 shows the shape of the side beams 40 connected to both sides of FIG. 2 above.

[0008] The cell stack assembly 10 of Fig. 2(a) is characterized in that the side support force of the cell stack assembly 10 is improved by applying side beams 40. As shown in Fig. 2(b), the pair of side beams 40 have protrusions 41 formed on the upper and lower parts, respectively, and the protrusions 41 are stepped so as to have a shape that interlocks with each other. Specifically, as shown in Fig. 3, the side beams 40 are composed of a first side beam 40a having a protrusion 41 formed on an upper part on one side of the cell stack 20, and a second side beam 40b having a protrusion 41 formed on a lower part on the other side.

[0009] Figure 4 shows a pack case 60 in which the cell stack assembly 10 of Figure 2 is housed, with a base plate 70, side walls 80, and main walls 90 supporting the bottom and sides of the cell stack assembly 10, respectively. The pack case 60 in which the cell stack assembly 10 of the type shown in Figure 2 is housed has the advantage that it is combined with the side walls 80 and main walls 90 to separate each cell stack assembly 10, and does not require a separate partition wall to divide the internal space.

[0010] Fig. 5 shows a pair of cell stack assemblies 10 housed in the internal space of the pack case 60 of Fig. 4. As shown in Fig. 5, the pair of adjacent cell stack assemblies 10 are joined together by meshing the first side beam 40a and the second side beam 40b provided on the sides of each cell stack assembly 10 with each other.

[0011] 6 shows a pack case 60 filled with cell stack assemblies 10, each of which is connected to the other via side beams 40. At this time, the first and second side beams 40a and 40b connected to each other function as existing separation walls.

[0012] As shown in Figures 1 to 6, the cell stack assembly 10 omitting the module frame has the advantage of being light in weight, but has the disadvantage of having a weak upper support force for the cell stack 20 since the cells 30 are exposed. Summary of the Invention [Problem to be solved by the invention]

[0013] Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a cell stack assembly having improved upper support force and a battery pack including the same.

[0014] Other objects and advantages of the present invention will become apparent from the following description and the embodiments of the present invention. Also, it is easily understood that the objects and advantages of the present invention can be realized by the means and combinations thereof as claimed in the claims. [Means for solving the problem]

[0015] According to the present invention, there is provided a cell stack assembly comprising: a cell stack in which a plurality of cells are stacked, with electrode leads led out to both sides thereof; a bus bar frame including bus bars electrically connected to each of the electrode leads and attached to a front and rear sides of the cell stack, respectively; a first side beam coupled to one end of the bus bar frame to support one side of the cell stack; and a second side beam coupled to the other end of the bus bar frame to support the other side of the cell stack, wherein the first side beam is comprised of a support portion supporting one side of the cell stack, and a plate-shaped pressure portion formed at an end of the support portion and perpendicular to the support portion.

[0016] The pressure portion may be formed on an upper end of the support portion, and the cross section of the first side beam may have a "T" shape.

[0017] The pressure portions may be formed at ends of the support portion so as to protrude on both sides of the support portion.

[0018] The pressure portion may be formed to extend along a longitudinal direction of the first side beam.

[0019] The first side beam and the second side beam may include a protruding portion that protrudes so as to form a step along a height direction of the cell stack.

[0020] The protrusion may include an upper protrusion formed on an upper portion of the first side beam and a lower protrusion formed on a lower portion of the second side beam.

[0021] The first and second side beams may have shapes such that the upper and lower protrusions are engaged with each other.

[0022] A shock absorbing pad may be attached to a lower end of the pressure portion of the first side beam.

[0023] According to the present invention, there is provided a battery pack including a pack case providing a space in which the cell stack assemblies are mounted, and any pair of cell stack assemblies arranged adjacent to each other are mounted in the pack case such that a first side beam of any one cell stack assembly is coupled to a second side beam of the other cell stack assembly.

[0024] The pressure portion of the first side beam included in any one of the cell stack assemblies may support upper portions of a pair of cell stacks located on both sides of the first side beam.

[0025] The pressure portion is formed at an upper end of the support portion in a shape protruding on both sides of the support portion, and the pressure portion can pressurize an upper portion of a cell stack included in a cell stack assembly including the support portion with a portion protruding on one side of the support portion, and can pressurize an upper portion of a cell stack included in another cell stack assembly disposed adjacent to the support portion with a portion protruding on the other side of the support portion.

[0026] A pressure member included in one of a pair of adjacently arranged cell stack assemblies may be screw-coupled to a bus bar frame included in the other cell stack assembly.

[0027] The first and second side beams include a coupling hole formed to penetrate vertically through the protrusion, and any pair of adjacent cell stack assemblies can be coupled such that the positions of the coupling hole included in the first side beam of any one cell stack assembly and the coupling hole included in the second side beam of the other cell stack assembly are aligned with each other.

[0028] The coupled pair of cell stack assemblies may be screwed together by a coupling member passing through coupling holes in the first side beam and a second side beam coupled to the first side beam. Effect of the Invention

[0029] According to the present invention, a battery pack with reduced weight and improved energy efficiency can be provided.

[0030] In addition, the present invention can provide a cell stack assembly and a battery pack including the same, which have improved upper support strength and improved safety. [Brief description of the drawings]

[0031] [Figure 1] 1 shows an example of a conventional battery module. [Diagram 2] 1 shows a conventional cell stack assembly to which side beams are applied. [Diagram 3] 1 is a perspective view of a side beam. [Figure 4] 3 shows a pack case in which the cell stack assembly of FIG. 2 is housed. [Diagram 5] 5 shows a pair of cell stack assemblies housed in the internal space of the pack case of FIG. 4. [Figure 6] The pack case is shown fully filled with cell stack assemblies. [Figure 7] FIG. 2 is a perspective view of a cell stack assembly of the present invention. [Figure 8] FIG. 2 is a front view of the cell stack assembly. [Figure 7] 1 is a perspective view of a battery pack according to a first embodiment of the present invention; [Figure 10] 10 is a cross-sectional view showing a part of the pack case of FIG. 9. [Figure 11] This shows the connection of a pair of cell stack assemblies arranged adjacent to each other in the pack case of Figure 9. [Figure 12] FIG. 12 is a front view of a pair of cell stack assemblies joined together in FIG. 11. [Figure 13] FIG. 11 is a perspective view of a pair of cell stack assemblies housed adjacent to each other in a battery pack according to a second embodiment of the present invention. [Figure 14] FIG. 14 is a front view of the cell stack assembly of FIG. 13. [Figure 15] This is a modification of FIG. [Figure 16] FIG. 11 is a perspective view of a pair of cell stack assemblies included in a battery pack according to a third embodiment of the present invention. [Figure 17] FIG. 11 is a front view of a cell stack assembly included in a battery pack according to a fourth embodiment of the present invention. [Figure 18] FIG. 2 is a front view of a pair of cell stack assemblies coupled to each other. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to best describe his own invention.

[0033] Therefore, the embodiment described in this specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0034] In addition, in the description of the present invention, if it is determined that a detailed description of related publicly known configurations or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0035] Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown roughly for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0036] The present invention relates to a cell stack assembly and a battery pack including the cell stack assembly. More specifically, the present invention provides a cell stack assembly including a side beam structure that applies pressure to upper portions of a plurality of cells, and a battery pack having improved support for the cell stack assembly accommodated in the side beam structure.

[0037] Figures 7 to 8 relate to a cell stack assembly of the present invention, Figures 9 to 12 relate to a battery pack according to a first embodiment of the present invention, Figures 13 to 15 relate to a battery pack according to a second embodiment of the present invention, Figure 16 relates to a battery pack according to a third embodiment of the present invention, and Figures 17 to 18 relate to a battery pack according to a fourth embodiment of the present invention.

[0038] Hereinafter, the cell stack assembly and the battery pack of the present invention will be described with reference to Figs.

[0039] <Cell stack assembly 400>

[0040] FIG. 7 shows a perspective view of a cell stack assembly 400 of the present invention, and FIG. 8 shows a front view of the cell stack assembly 400. As shown in FIG.

[0041] The cell stack assembly 400 includes a cell stack 410 in which a plurality of cells 411 are stacked, a bus bar frame 420 coupled to the front and rear surfaces of the cell stack 410, and a pair of side beams 430a, 430b coupled to both sides of the cell stack 410, respectively.

[0042] The cell stack 410 is composed of a plurality of cells 411, each having electrode leads (not shown) led out from both sides thereof. More specifically, the cell stack 410 is composed of a plurality of cells 411 stacked in one direction.

[0043] The bus bar frame 420 includes bus bars (not shown) electrically connected to each electrode lead of the cell stack 410, and is coupled to the front and rear surfaces of the cell stack 410 to cover the electrode leads.

[0044] The side beams 430a, 430b include a first side beam 430a coupled to one side of the cell stack 410 and a second side beam 430b coupled to the other side of the cell stack 410. More specifically, the first side beam 430a is coupled to one end of the bus bar frame 420 to support one side of the cell stack 410, and the second side beam 430b is coupled to the other end of the bus bar frame 420 to support the other side of the cell stack 410.

[0045] The cell stack assembly 400 of the present invention has a shape in which the first side beam 430a presses a part of the upper end of the cell stack 410. Specifically, the first side beam 430a is characterized by being composed of a support part P2 that supports a side part of the cell stack 410, and a pressurizing part P1 that presses the upper part of the cell stack 410.

[0046] As shown in Figures 7 and 8, the first side beam 430a is composed of a support part P2 that supports one side of the cell stack 410, and a plate-shaped pressure part P1 that is formed at an end of the support part P2 and is perpendicular to the support part P2.

[0047] The pressure portion P1 is formed on the upper end of the support portion P2.

[0048] The cross section of the first side beam 430a, which is composed of the support portion P2 and the pressure portion P1 connected to the upper end of the support portion P2, has a "T" shape as shown in the figure. That is, the pressure portion P1 is formed at the end of the support portion P2 in a shape protruding on both sides of the support portion P2.

[0049] As shown in FIG. 7, the pressing portion P1 is formed to extend along the longitudinal direction of the first side beam 430a and presses the upper portion of the cell stack 410 adjacent to the cell stack 410 along the longitudinal direction of the cell stack assembly 400.

[0050] The first side beam 430a and the second side beam 430b each include protrusions 431a and 431b that protrude so as to form a step along the height direction of the cell stack 410.

[0051] The protrusions 431a and 431b may be divided into an upper protrusion 431a formed on the upper portion of the side beams 430a and 430b and a lower protrusion 431b formed on the lower portion.

[0052] The first side beam 430a includes an upper protrusion 431a, and the second side beam 430b includes a lower protrusion 431b.

[0053] The first and second side beams 430a and 430b have a shape in which the upper and lower protrusions 431a and 431b are engaged with each other.

[0054] <Battery pack>

[0055] The battery pack of the present invention is characterized in that it includes a cell stack assembly 400 having a first side beam 430a on one side thereof, the first side beam 430a including a pressing portion P1 shaped to pressurize an upper portion of the cell stack 410.

[0056] (First embodiment) FIG. 9 is a perspective view of the battery pack according to the first embodiment of the present invention.

[0057] As shown in FIG. 9, the battery pack includes a pack case 1000 that provides a space in which a plurality of cell stack assemblies 400 are mounted.

[0058] The pack case 1000 includes a base plate 100 that supports the lower part of the cell stack assembly 400, a side wall 200 that is connected along the edge of the base plate 100 to support the sides of each cell stack assembly 400, and a main wall 300 that is connected to the base plate 100 across the center of the pack case 1000.

[0059] The main wall 300 is formed to extend along the longitudinal direction of the pack case 1000 and is coupled to the base plate 100 so as to divide the internal space of the pack case 1000 into two large sections.

[0060] A plurality of cell stack assemblies 400 are disposed on both sides of the main wall 300 and mounted on the base plate 100. At this time, each cell stack assembly 400 is disposed such that side beams 430a, 430b provided on the sides are adjacent to and coupled to each other.

[0061] Specifically, any pair of adjacent cell stack assemblies 400 are mounted on the pack case 1000 such that the first side beam 430a of any one of the cell stack assemblies 400 is coupled to the second side beam 430b of the other cell stack assembly 400. Therefore, the pressing portion P1 of the first side beam 430a included in any one of the cell stack assemblies 400 supports the upper portions of the pair of cell stacks 410 located on both sides.

[0062] FIG. 10 is a cross-sectional view in which a part of pack case 1000 of FIG. 9 is cut away.

[0063] 10, a first side beam 430a on one side of any one cell stack assembly 400 is coupled to a second side beam 430b on one side of another adjacent cell stack assembly 400 in an intermeshed manner. In addition, a pressure portion P1 on the upper part of the first side beam 430a supports and presses the upper parts of the cell stacks 410 located on both sides of the coupled first and second side beams 430a and 430b.

[0064] Specifically, the pressure member P1 is formed at the upper end of the support member P2 in a shape protruding on both sides of the support member P2, and applies pressure to the upper part of the cell stack 410 included in the cell stack assembly 400 including the support member P2 at the protruding portion on one side of the support member P2, and applies pressure to the upper part of the cell stack 410 included in another cell stack assembly 400 arranged adjacent to the support member P2 at the protruding portion on the other side of the support member P2.

[0065] Figure 11 shows the connection of a pair of cell stack assemblies 400 arranged adjacent to each other in the pack case 1000 of Figure 9 above, and Figure 12 shows a front view of the pair of cell stack assemblies 400 connected in Figure 11 above.

[0066] 11 and 12, the first side beam 430a included in any one of the cell stack assemblies 400 is coupled to the second side beam 430b such that the pressure part P1 covers the second side beam 430b of the other cell stack assembly 400. Therefore, the pressure part P1 between the pair of cell stack assemblies 400 supports and presses the upper parts of the two adjacent cell stacks 410.

[0067] Therefore, the upper portions of the two cell stacks 410 can be stably supported by one pressure portion P1 included in the first side beam 430a.

[0068] Second embodiment In the battery pack of the present invention, the first side beam 430a included in any one of the cell stack assemblies 400 may be screwed to the bus bar frame 420 of another adjacent cell stack assembly 400.

[0069] FIG. 13 is a perspective view of a pair of cell stack assemblies 400 housed adjacent to each other in a battery pack according to a second embodiment of the present invention, and FIG. 14 is a front view of the cell stack assembly 400 of FIG.

[0070] 13 and 14, a pressure member P1 included in one of a pair of adjacently arranged cell stack assemblies 400 is connected to a bus bar frame 420 included in the other cell stack assembly 400 by a connecting member B such as a bolt.

[0071] The pressure member P1 includes a screw hole H1 at a position corresponding to an upper portion of the bus bar frame 420 of the adjacent cell stack assembly 400, and the bus bar frame 420 of the adjacent cell stack assembly 400 also includes a thread groove (not shown) at a position corresponding to the screw hole H1. Therefore, the first side beam 430a including the pressure member P1 is fixed to the adjacent cell stack assembly 400 by a coupling member B which penetrates the screw hole H1 and is screwed into the thread groove of the bus bar frame 420.

[0072] In the battery pack of the present invention, in order to ensure a more stable supporting force by the pressing part P1, a connecting member B may be connected to each corner of the pressing part P1.

[0073] Fig. 15 is a modified example of Fig. 13, and according to Fig. 15, a screw hole H1 is formed at each corner of the pressure part P1, and four coupling members B are coupled to each screw hole H1. At this time, the coupling members B inserted into the screw holes H1 formed at the front end of the pressure part P1 are screwed to the bus bar frame 420 located at the front end of the pair of cell stack assemblies 400, and the coupling members B inserted into the screw holes H1 formed at the rear end of the pressure part P1 are screwed to the bus bar frame 420 located at the rear end of the pair of cell stack assemblies 400.

[0074] Third embodiment In the battery pack of the present invention, a pair of adjacently coupled cell stack assemblies 400 can be fixed to each other by a coupling member B which penetrates two interlocking side beams 430a, 430b at a time.

[0075] FIG. 16 is a perspective view of a pair of cell stack assemblies 400 included in a battery pack according to a third embodiment of the present invention.

[0076] Referring to FIG. 16, the first side beam 430a and the second side beam 430b include a coupling hole H2 formed to vertically penetrate the protrusions 431a, 431b, and a pair of adjacent cell stack assemblies 400 are coupled such that the positions of the coupling hole H2 included in the first side beam 430a of one of the cell stack assemblies 400 and the coupling hole included in the second side beam 430b of the other cell stack assembly 400 coincide with each other.

[0077] The pair of coupled cell stack assemblies 400 are screwed together by a coupling member B, such as a bolt, which simultaneously passes through coupling holes H2 of the first side beam 430a and the second side beam 430b coupled to the first side beam 430a.

[0078] (Fourth embodiment) In the battery pack of the present invention, a buffer pad 500 may be interposed between the pressing part P1 that supports and presses the upper part of the cell stack 410 and the cell stack 410 to reduce impacts transmitted from the pressing part P1.

[0079] FIG. 17 is a front view of a cell stack assembly 400 included in a battery pack according to a fourth embodiment of the present invention, and FIG. 18 shows a front view of a pair of cell stack assemblies 400 coupled to each other.

[0080] 17, a buffer pad 500 is attached to the lower end of the pressing portion P1 of the first side beam 430a. The buffer pad 500 is used for the purpose of preventing the pressing portion P1 of the first side beam 430a from directly contacting the cell stack 410 and transmitting an impact, and for the purpose of improving the supporting force of the pressing portion P1.

[0081] The buffer pad 500 may generally include a material capable of absorbing shock. For example, the buffer pad 500 may be made of polyurethane, and the pressure of the pressure part P1 is transferred to the upper part of the cell stack 410 via the buffer pad 500.

[0082] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments, etc. in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0083] 10: (Prior Art) Cell Stack Assembly 20: (Conventional technology) Cell stack 30: (Conventional technology) Cell 40: (Conventional technology) Side beam 40a: (Prior Art) First Side Beam 40b: (Prior Art) Second Side Beam 41: (Prior Art) Protrusion 50: (Conventional technology) Busbar frame 60: (Conventional technology) Pack case 70: (Conventional technology) Base plate 80: (Prior Art) Sidewall 90: (Conventional technology) Main wall 1000: Pack case 100: Base plate 200: Side wall 300: Main wall 400: Cell stack assembly 410: Cell Stack 411: Cell 420: Busbar frame 430a: 1st side beam 430b: 2nd side beam 431a: Upper protrusion 431b: Lower protrusion 500: Buffer pad B: Connecting member P1: Pressurizing part P2: Support part H1: Screw hole H2: Binding hole

Claims

1. a cell stack in which a plurality of cells, each having electrode leads on both sides, are stacked; a bus bar frame including a bus bar electrically connected to each of the electrode leads and coupled to a front and rear surfaces of the cell stack, respectively; a first side beam coupled to one end of the bus bar frame to support one side of the cell stack; a second side beam coupled to the other end of the bus bar frame to support the other side of the cell stack, the first side beam is composed of a support portion that supports a side portion of the cell stack and a pressure portion that applies pressure to an upper portion of the cell stack.

2. The cell stack assembly of claim 1 , wherein the first side beam comprises a support portion that supports one side of the cell stack, and a plate-shaped pressure portion that is formed at an end of the support portion and perpendicular to the support portion.

3. The pressure applying portion is formed on an upper end of the support portion, The cell stack assembly of claim 1 , wherein the first side beam has a cross section having a "T" shape.

4. The cell stack assembly according to claim 1 , wherein the pressure members are formed at ends of the support members so as to protrude from both sides of the support members.

5. The cell stack assembly of claim 1 , wherein the pressure portion is formed to extend along a longitudinal direction of the first side beam.

6. The cell stack assembly according to claim 1 , wherein the first side beam and the second side beam include a protruding portion that protrudes to form a step along a height direction of the cell stack.

7. The cell stack assembly of claim 6 , wherein the protrusions include an upper protrusion formed on an upper portion of the first side beam and a lower protrusion formed on a lower portion of the second side beam.

8. The cell stack assembly according to claim 7 , wherein the first side beam and the second side beam have shapes such that the upper protrusion and the lower protrusion are engaged with each other.

9. A battery pack housing the cell stack assembly according to claim 1, a pack case providing a space in which the cell stack assembly is seated, A battery pack, wherein any pair of cell stack assemblies arranged adjacent to each other are mounted in the pack case such that a first side beam of any one cell stack assembly is coupled to a second side beam of the other cell stack assembly.

10. The battery pack of claim 9 , wherein the pressing portion of the first side beam included in any one of the cell stack assemblies supports upper portions of a pair of cell stacks located on both sides thereof.

11. The pressure portion is formed on an upper end of the support portion so as to protrude on both sides of the support portion, 11. The battery pack of claim 10, wherein the pressurizing portion pressurizes an upper portion of a cell stack included in a cell stack assembly including the support portion with a portion protruding from one side of the support portion, and pressurizes an upper portion of a cell stack included in another cell stack assembly disposed adjacent to the support portion with a portion protruding from the other side of the support portion.

12. 11. The battery pack of claim 10, wherein a pressure member included in one of a pair of adjacently arranged cell stack assemblies is screwed to a bus bar frame included in the other cell stack assembly.

13. the first side beam and the second side beam include protruding portions that protrude to form a step along a height direction of the cell stack, the first side beam and the second side beam each include a coupling hole formed to pass through the protrusion in a vertical direction; 10. The battery pack of claim 9, wherein any pair of adjacent cell stack assemblies are coupled such that a position of a coupling hole included in a first side beam of any one cell stack assembly and a position of a coupling hole included in a second side beam of the other cell stack assembly are aligned with each other.

14. 14. The battery pack of claim 13, wherein the coupled pair of cell stack assemblies are screw-coupled by a coupling member passing through coupling holes of the first side beam and a second side beam coupled to the first side beam.

15. The battery pack of claim 9, wherein a shock absorbing pad is attached to a lower end of the pressure portion of the first side beam.

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