Cell stack assembly and battery pack including the above cell stack assembly

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 to which a side beam structure having a shape for pressing the upper portions of a plurality of cells is applied, and a battery pack in which the supporting 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 filed on December 2, 2022, and Korean Patent Application No. 10-2023-0037378 filed on March 22, 2023, and all the contents disclosed in the documents of the Korean patent applications are included as part of this specification.

Background Art

[0003] Types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, nickel zinc batteries, etc. The operating voltage of such a unit secondary battery cell, that is, a unit battery cell, is about 2.5V to 4.2V. Therefore, when a higher output voltage is required, a plurality of battery cells may be connected in series to form a battery pack. Also, depending on the charge / discharge capacity required for the battery pack, a large number of battery cells may be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be variously set according to the 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, first, a battery module composed of a plurality of battery cells is formed.

[0005] Figure 1 shows an example of a conventional battery module, a perspective view of a cell stack assembly 10 in which the cells 30 are exposed to the outside. In the cell stack assembly 10 shown in Figure 1, electrode leads are led out on both sides, and busbar frames 50 covering the electrode leads are connected to the front and back of multiple cells 30 that are stacked in one direction.

[0006] The configuration shown in Figure 1 above is a structure in which the module frame that surrounds and protects the internal cells 30 is omitted, and has the advantage of being lighter in weight compared to existing battery modules in which the cells 30 are surrounded and sealed.

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

[0008] The cell stack assembly 10 shown in Figure 2(a) above is characterized by the application of side beams 40 to improve the lateral support force of the cell stack assembly 10. As shown in Figure 2(b), the pair of side beams 40 each have protrusions 41 formed on the upper and lower parts, and the protrusions 41 are formed with steps so that they interlock with each other. Specifically, as shown in Figure 3, the side beams 40 consist of a first side beam 40a on one side of the cell stack 20 with a protrusion 41 formed on the upper part and a second side beam 40b on the other side with a protrusion 41 formed on the lower part.

[0009] Figure 4 shows a pack case 60 in which the cell stack assembly 10 shown in Figure 2 is housed, with the base plate 70, side walls 80, and main wall 90 supporting the lower and side portions of the cell stack assembly 10, respectively. The pack case 60 in which the cell stack assembly 10 in the configuration shown in Figure 2 is housed has the advantage that each cell stack assembly 10 is connected to the side walls 80 and main wall 90, eliminating the need for separate partitioning walls to divide the internal space.

[0010] Figure 5 shows a pair of cell stack assemblies 10 housed in the internal space of the pack case 60 shown in Figure 4. As shown in Figure 5, the pair of adjacent cell stack assemblies 10 are connected by interlocking first side beams 40a and second side beams 40b provided on the sides of each cell stack assembly 10.

[0011] Figure 6 shows a pack case 60 with all cell stack assemblies 10 filled, where each cell stack assembly 10 is connected to the others via the side beams 40. In this case, the connected first side beam 40a and second side beam 40b take on the role of the existing separation wall.

[0012] As shown in Figures 1 to 6 above, the cell stack assembly 10, which omits the module frame, has the advantage of being lightweight, but it has the disadvantage that the cell stack 20 has weak upper support capacity because the cell 30 is exposed. [Overview of the project] [Problems that the invention aims to solve]

[0013] Therefore, the present invention was devised to solve the above-mentioned problems, and aims to provide a cell stack assembly with improved upper support capacity and a battery pack including the same.

[0014] Other objects and advantages of the present invention can be understood from the following description and will be more clearly seen from the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations set forth in the claims. [Means for solving the problem]

[0015] The present invention provides a cell stack assembly comprising: a cell stack in which a plurality of cells with electrode leads leading out on both sides are stacked; a busbar frame attached to the front and rear surfaces of the cell stack, respectively, and including busbars electrically connected to each of the electrode leads; a first side beam coupled to one end of the busbar frame so as to support one side surface of the cell stack; and a second side beam coupled to the other end of the busbar frame so as to support the other side surface of the cell stack, wherein the first side beam is composed of a support portion that supports one side of the cell stack and a plate-shaped pressurizing portion formed at the end of the support portion and perpendicular to the support portion.

[0016] The pressurized portion is formed at the upper end of the support portion, and the cross-section of the first side beam may have a "T" shape.

[0017] The pressurizing portion can be formed at the end of the support portion in a shape that protrudes from both sides of the support portion.

[0018] The pressurized portion described above can be extended along the longitudinal direction of the first side beam.

[0019] The first and second side beams described above may include protrusions that extend outward to form steps along the height direction of the cell stack.

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

[0021] The first side beam and the second side beam may have a shape in which the upper protrusion and the lower protrusion interlock and connect with each other.

[0022] A cushioning pad may be attached to the lower end of the pressurized portion of the first side beam described above.

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

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

[0025] The pressing portion is formed at the upper end of the support portion in a shape protruding on both sides of the support portion, and the pressing portion presses the upper portion of the cell stack included in the cell stack assembly including the support portion at a site protruding to one side of the support portion, and may press the upper portion of the cell stack included in another cell stack assembly arranged adjacent to the support portion at a site protruding to the other side of the support portion.

[0026] The pressing portion included in any one of a pair of adjacent cell stack assemblies may be screw-coupled to a bus bar frame included in the other cell stack assembly.

[0027] The first side beam and the second side beam include coupling holes formed to penetrate the protruding portion, and any pair of adjacent cell stack assemblies may be coupled such that the positions of the coupling holes included in the first side beam of one cell stack assembly and the coupling holes included in the second side beam of the other cell stack assembly coincide with each other.

[0028] The coupled pair of cell stack assemblies may be screw-coupled by a coupling member that penetrates the coupling holes of the first side beam and the second side beam coupled to the first side beam.

Effects of the Invention

[0029] According to the present invention, it is possible to provide a battery pack with reduced weight and improved energy efficiency.

[0030] Further, according to the present invention, it is possible to provide a cell stack assembly with improved upper support force and enhanced safety, and a battery pack including the same.

Brief Description of the Drawings

[0031] [Figure 1] An example of one of the conventional battery modules is shown. [Figure 2] A conventional cell stack assembly to which side beams are applied is shown. [Figure 3] A perspective view of the side beam is shown. [Figure 4] A pack case in which the cell stack assembly of FIG. 2 above is accommodated is shown. [Figure 5] A pair of cell stack assemblies accommodated in the internal space of the pack case of FIG. 4 above is shown. [Figure 6] A pack case in which the cell stack assembly is all filled is shown. [Figure 7] It is a perspective view of the cell stack assembly of the present invention. [Figure 8] It is a front view of the cell stack assembly. [Figure 7] It is a perspective view of the battery pack according to the first embodiment of the present invention. [Figure 10] It is a cross-sectional view of a part of the pack case of FIG. 9 above cut away. [Figure 11] The connection of a pair of cell stack assemblies arranged adjacent to each other in the pack case of FIG. 9 above is shown. [Figure 12] A front view of the pair of cell stack assemblies connected in FIG. 11 above is shown. [Figure 13] It is a perspective view of a pair of cell stack assemblies accommodated adjacent to the battery pack according to the second embodiment of the present invention. [Figure 14] Figure 13 above is a front view of the cell stack assembly. [Figure 15] This is a modified example of Figure 13 above. [Figure 16] This is a perspective view of a pair of cell stack assemblies included in a battery pack according to the third embodiment of the present invention. [Figure 17] This is a front view of a cell stack assembly included in a battery pack according to the fourth embodiment of the present invention. [Figure 18] This is a front view of a pair of cell stack assemblies joined together. [Modes for carrying out the invention]

[0032] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Before that, however, the terms and words used herein and in the claims should not be interpreted to be limited to their ordinary or dictionary meanings, but rather to be interpreted as meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that an inventor may appropriately define the concepts of terms in order to best describe his own invention.

[0033] Therefore, the embodiments described herein and the configurations shown in the drawings represent only one of the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention; there are various equivalents and modifications that can substitute for them at the time of filing.

[0034] Furthermore, in describing the present invention, if it is determined that a specific description of a related known configuration or function would likely obscure the gist of the invention, such detailed description will be omitted.

[0035] Since embodiments of the present invention are provided to more fully explain the invention to an ordinary person, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown schematically for the sake of clarity. Accordingly, the sizes and proportions of each component do not fully 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 is characterized by providing a cell stack assembly to which a side beam structure shaped to pressurize the top of a plurality of cells is applied, and a battery pack in which the support force of the cell stack assembly housed in the side beam structure is improved.

[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 the first embodiment of the present invention, Figures 13 to 15 relate to a battery pack according to the second embodiment of the present invention, Figure 16 relates to a battery pack according to the third embodiment of the present invention, and Figures 17 to 18 relate to a battery pack according to the fourth embodiment of the present invention.

[0038] The cell stack assembly and battery pack of the present invention will be described below with reference to Figures 7 to 17.

[0039] <Cell stack assembly 400>

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

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

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

[0043] The busbar frame 420 includes busbars (not shown) that are 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 so as to cover the electrode leads.

[0044] The side beams 430a and 430b described above 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 busbar 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 busbar 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 pressurizes a portion of the upper end of the cell stack 410. Specifically, the first side beam 430a is characterized by being composed of a support portion P2 that supports the side of the cell stack 410 and a pressurizing portion P1 that pressurizes the upper part of the cell stack 410.

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

[0047] The pressurized portion P1 is formed at 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 pressurizing portion P1 connected to the upper end of the support portion P2, has a "T" shape as shown in the figure. That is, the pressurizing portion P1 is formed at the end of the support portion P2 in a shape that protrudes from both sides of the support portion P2.

[0049] As shown in Figure 7, the pressurizing section P1 extends along the longitudinal direction of the first side beam 430a and pressurizes the upper part of the cell stack 410 located adjacent to the cell stack assembly 400 along its longitudinal direction.

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

[0051] The above-mentioned protrusions 431a and 431b can be divided into an upper protrusion 431a formed on the upper part of the side beams 430a and 430b, and a lower protrusion 431b formed on the lower part.

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

[0053] The first side beam 430a and the second side beam 430b have a shape in which the upper protrusion 431a and the lower protrusion 431b interlock and connect with each other.

[0054] <Battery Pack>

[0055] The battery pack of the present invention is characterized by including a cell stack assembly 400 having a first side beam 430a on one side, which includes a pressurizing portion P1 shaped to pressurize the upper part of the cell stack 410.

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

[0057] The battery pack described above includes a pack case 1000 that provides space for mounting multiple cell stack assemblies 400, as shown in Figure 9.

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

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

[0060] Multiple cell stack assemblies 400 are positioned on both sides of the main wall 300 and fixed onto the base plate 100. At this time, each cell stack assembly 400 is positioned such that the side beams 430a and 430b provided on its sides are in contact with and connected to each other.

[0061] Specifically, any pair of cell stack assemblies 400, which are arranged adjacent to each other, are attached to the pack case 1000 such that the first side beam 430a of one of the cell stack assemblies 400 is coupled to the second side beam 430b of the other cell stack assembly 400. Thus, the pressurized portion P1 of the first side beam 430a included in any one of the cell stack assemblies 400 supports the upper parts of the pair of cell stacks 410 located on either side.

[0062] Figure 10 is a cross-sectional view obtained by cutting off a portion of the pack case 1000 shown in Figure 9 above.

[0063] As shown in Figure 10 above, one first side beam 430a of any one cell stack assembly 400 is connected to one second side beam 430b of another adjacent cell stack assembly 400 in a manner that interlocks with each other. Furthermore, the pressurizing portion P1 at the top of the first side beam 430a supports and pressurizes the upper parts of the cell stacks 410 located on both sides of the connected first side beam 430a and second side beam 430b.

[0064] Specifically, the pressurizing portion P1 is formed at the upper end of the support portion P2, with a shape that protrudes from both sides of the support portion P2. The portion protruding from one side of the support portion P2 pressurizes the upper part of the cell stack 410 included in the cell stack assembly 400 including the support portion P2, and the portion protruding from the other side of the support portion P2 pressurizes the upper part of the cell stack 410 included in another cell stack assembly 400 arranged adjacent to the support portion 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, and Figure 12 shows a front view of the pair of cell stack assemblies 400 connected in Figure 11.

[0066] A first side beam 430a included in any one of the cell stack assemblies 400 is coupled to the second side beam 430b of the other cell stack assembly 400, as shown in Figures 11 and 12, such that the pressurizing section P1 covers the second side beam 430b of the other cell stack assembly 400. Thus, the pressurizing section P1 between the pair of cell stack assemblies 400 supports and pressurizes the upper parts of two adjacent cell stacks 410.

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

[0068] (Second Embodiment) The battery pack of the present invention can also be configured such that a first side beam 430a contained in any one cell stack assembly 400 is screw-coupled to the busbar frame 420 of another adjacent cell stack assembly 400.

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

[0070] As shown in Figures 13 and 14 above, the pressurizing section P1 included in one of the pair of adjacent cell stack assemblies 400 is connected to the busbar frame 420 included in the other cell stack assembly 400 by connecting members B such as bolts.

[0071] The pressurized portion P1 includes a screw hole H1 at a position corresponding to the upper part of the busbar frame 420 of the adjacent cell stack assembly 400, and the busbar frame 420 of the other cell stack assembly 400 also includes a screw groove (not shown) at a position corresponding to the screw hole H1. Therefore, the first side beam 430a including the pressurized portion P1 is fixed to the other cell stack assembly 400 by a connecting member B that passes through the screw hole H1 and is screw-connected to the screw groove of the busbar frame 420.

[0072] In order to ensure more stable support force from the pressurized portion P1, the battery pack of the present invention may also have connecting members B attached to each corner of the pressurized portion P1.

[0073] Figure 15 is a modified example of Figure 13. According to Figure 15, screw holes H1 are formed at each corner of the pressurizing section P1, and four connecting members B are connected to each of the screw holes H1. In this case, the connecting member B inserted into the screw hole H1 formed at the front end of the pressurizing section P1 is screw-connected to the busbar frame 420 located at the front end of the pair of cell stack assemblies 400, and the connecting member B inserted into the screw hole H1 formed at the rear end of the pressurizing section P1 is screw-connected to the busbar frame 420 located at the rear end of the pair of cell stack assemblies 400.

[0074] (Third embodiment) The battery pack of the present invention can be fixed to each other by a coupling member B that penetrates simultaneously two side beams 430a and 430b, to which a pair of adjacently coupled cell stack assemblies 400 are interlocked and coupled.

[0075] Figure 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] As shown in Figure 16 above, the first side beam 430a and the second side beam 430b include coupling holes H2 formed to penetrate vertically through the protrusions 431a and 431b, and a pair of adjacent cell stack assemblies 400 are coupled such that the coupling holes H2 in the first side beam 430a of one of the cell stack assemblies 400 and the coupling holes in the second side beam 430b of the other cell stack assemblies 400 are aligned with each other.

[0077] The pair of cell stack assemblies 400 connected as described above are screw-connected by connecting members B, such as bolts, which simultaneously pass through the connecting holes H2 of the first side beam 430a and the second side beam 430b connected to the first side beam 430a.

[0078] (Fourth Embodiment) In the battery pack of the present invention, a cushioning pad 500 may be interposed between the pressurizing portion P1, which supports and pressurizes the upper part of the cell stack 410, and the cell stack 410 in order to mitigate shocks and the like transmitted from the pressurizing portion P1.

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

[0080] As shown in Figure 17 above, a cushioning pad 500 is attached to the lower end of the pressurized portion P1 of the first side beam 430a. The cushioning pad 500 is used to prevent the pressurized portion P1 of the first side beam 430a from directly contacting the cell stack 410 and transmitting impact, and to improve the support capacity of the pressurized portion P1.

[0081] The cushioning pad 500 may generally contain a material capable of absorbing impact. For example, the cushioning pad 500 may be made of polyurethane or the like, and the pressure from the pressurizing section P1 is transmitted to the upper part of the cell stack 410 via the cushioning pad 500.

[0082] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, at the time of filing, there may be various equivalents and modifications that can substitute for them. [Explanation of Symbols]

[0083] 10: (Conventional Technology) Cell Stack Assembly 20: (Conventional Technology) Cell Stack 30: (Conventional technology) Cell 40: (Conventional technology) Side beam 40a: (Conventional Technology) First Side Beam 40b: (Conventional technology) Second side beam 41: (Conventional technology) Protruding part 50: (Conventional technology) Busbar frame 60: (Conventional technology) Pack case 70: (Conventional technology) Base plate 80: (Conventional technology) Side wall 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: First side beam 430b: Second side beam 431a: Upper protrusion 431b: Lower protrusion 500: Cushioning pad B: Connecting member P1: Pressurized section P2: Support part H1: Screw hole H2: Bonding Hole

Claims

1. A cell stack in which multiple cells with electrode leads leading out on both sides are stacked, A busbar frame is included which includes a busbar electrically connected to each of the electrode leads, and which is coupled to the front and rear surfaces of the cell stack, respectively. A first side beam is coupled to one end of the busbar frame so as to support one side of the cell stack, Includes a second side beam coupled to the other end of the busbar frame so as to support the other side of the cell stack, The first side beam is a cell stack assembly comprising a support portion that supports the side of the cell stack and a pressurizing portion that pressurizes the upper part of the cell stack.

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

3. The pressurizing portion is formed at the upper end of the support portion, The cell stack assembly according to claim 1, wherein the cross-section of the first side beam is "T" shaped.

4. The cell stack assembly according to claim 1, wherein the pressurizing portion is formed at the end of the support portion in a shape that protrudes from both sides of the support portion.

5. The cell stack assembly according to claim 1, wherein the pressurizing portion is extended along the 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 protrusions that project outward to form a step along the height direction of the cell stack.

7. The cell stack assembly according to claim 6, wherein the protrusion includes an upper protrusion formed on the upper part of the first side beam and a lower protrusion formed on the lower part 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 a shape in which the upper protrusion and the lower protrusion interlock and connect with each other.

9. In a battery pack housing the cell stack assembly described in claim 1, Includes a pack case that provides a space for the cell stack assembly to be installed, A battery pack in which any pair of cell stack assemblies, arranged adjacent to each other, are attached to the pack case such that the first side beam of one of the cell stack assemblies is coupled to the second side beam of the other cell stack assembly.

10. The battery pack according to claim 9, wherein the pressurized portion of the first side beam included in any one of the cell stack assemblies supports the upper parts of a pair of cell stacks located on each side.

11. The pressurizing portion is formed at the upper end of the support portion in a shape that protrudes from both sides of the support portion. The battery pack according to claim 10, wherein the pressurizing portion pressurizes the upper part 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 the upper part of a cell stack included in another cell stack assembly arranged adjacent to the support portion with a portion protruding from the other side of the support portion.

12. The battery pack according to claim 10, wherein a pressurized section included in one of any pair of adjacently arranged cell stack assemblies is screw-coupled to a busbar frame included in the other cell stack assembly.

13. The first side beam and the second side beam include protrusions that project outward to form a step along the height direction of the cell stack. The first side beam and the second side beam include coupling holes formed to penetrate the protruding portion vertically, The battery pack according to claim 9, wherein any pair of adjacent cell stack assemblies are coupled such that the positions of coupling holes in the first side beam of one of the cell stack assemblies coincide with the positions of coupling holes in the second side beam of the other cell stack assembly.

14. The battery pack according to claim 13, wherein the pair of coupled cell stack assemblies are screw-connected by coupling members that penetrate coupling holes in the first side beam and the second side beam coupled to the first side beam.

15. The battery pack according to claim 9, wherein a cushioning pad is attached to the lower end of the pressurized portion of the first side beam.

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