Battery pack

Abstract

The technical concept of the present invention provides a battery pack comprising: a cell assembly comprising a cell block having a plurality of battery cells and a side beam connected to the cell block; a pack frame comprising a base frame which supports the cell assembly and a side frame which faces the side portion of the cell assembly; and a pack cross beam which is coupled to the side frame and the base frame, and extends in a first direction, wherein a first end portion of the side beam facing the side frame is spaced apart from the side frame in the first direction with a first gap provided therebetween, and the pack cross beam comprises a first portion overlapping the side beam; and a second portion which protrudes from the first end portion of the side beam in the first direction and is coupled to the side frame.

Description

battery pack

[0001] The present invention relates to a battery pack. The present application claims the benefit of Korean application No. 10-2024-0145522, filed on October 23, 2024, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices, such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel-powered vehicles, the primary application of secondary batteries is shifting from mobile devices to mobility. As secondary batteries are used in mobility, demands for their safety are increasing. Since accidents such as fires involving secondary batteries used in mobility can endanger the lives of drivers, research into technologies to enhance the safety of secondary batteries is indispensable.

[0003] The problem that the technical concept of the present invention aims to solve is to provide a battery pack.

[0004] To solve the above-mentioned problem, the technical concept of the present invention provides a battery pack comprising: a cell assembly including a cell block having a plurality of battery cells and a side beam connected to the cell block; a pack frame including a base frame supporting the cell assembly and a side frame facing the side of the cell assembly; and a pack cross beam coupled to the side frame and the base frame and extending in a first direction; wherein the first end of the side beam facing the side frame is spaced apart from the side frame in the first direction with a first gap between them, and the pack cross beam comprises: a first part superimposed on the side beam; and a second part protruding from the first end of the side beam in the first direction and coupled to the side frame.

[0005] In exemplary embodiments, the invention is characterized by further including a bonding layer that bonds the second portion of the pack cross beam to the side frame.

[0006] In exemplary embodiments, the bonding layer is characterized by extending along the edge of the side of the pack cross beam facing the side frame.

[0007] In exemplary embodiments, the bonding layer is characterized by comprising a metal.

[0008] In exemplary embodiments, the distance along the first direction between the side frame and the side beam is characterized as being greater than the distance along the first direction between the side frame and the pack cross beam.

[0009] In exemplary embodiments, the side beam is characterized by comprising: a side body provided between the cell block and the pack cross beam; and an upper body seated on the pack cross beam and coupled to the first portion of the pack cross beam.

[0010] In exemplary embodiments, the second portion of the pack cross beam is characterized by including an extension provided between the side frame and the upper body of the side beam.

[0011] In exemplary embodiments, the invention further comprises a bonding layer that bonds the second portion of the pack cross beam to the side frame, wherein the bonding layer extends along the extension of the second portion of the pack cross beam.

[0012] In exemplary embodiments, the upper body of the side beam is further characterized by including a fastening bolt that fastens the upper body of the side beam to the first part of the pack cross beam.

[0013] In exemplary embodiments, the apparatus further comprises: a bonding layer for bonding the second portion of the pack cross beam to the side frame; and a fastening bolt for fastening the upper body of the side beam to the first portion of the pack cross beam; wherein the second portion of the pack cross beam includes an extension provided between the side frame and the upper body of the side beam, and the bonding layer extends along the extension of the second portion of the pack cross beam.

[0014] In exemplary embodiments, the first portion of the pack cross beam comprises an inclined surface, and the upper body of the side beam comprises an inclined surface in contact with the inclined surface of the pack cross beam.

[0015] In exemplary embodiments, the first portion of the pack cross beam comprises a first surface and a second surface inclined with respect to the first surface, and the upper body of the side beam comprises a third surface and a fourth surface inclined with respect to the third surface, wherein the first surface of the first portion of the pack cross beam contacts the third surface of the upper body of the side beam, and the second surface of the first portion of the pack cross beam contacts the fourth surface of the upper body of the side beam.

[0016] In exemplary embodiments, the plurality of battery cells are characterized by being arranged in a second direction perpendicular to the first direction.

[0017] According to the battery pack according to exemplary embodiments, the connection between the pack cross beam and the side frame is realized through welding, thereby improving the rigidity of the battery pack.

[0018] According to the battery pack according to exemplary embodiments, a gap is provided between the side beam and the side frame, so that when assembling the side beam to the pack cross beam, the side beam can be prevented from interfering with the joint layer formed by welding, and assembly between the side beam and the pack cross beam can be made easier.

[0019] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0020] FIG. 1 is a perspective view showing a battery pack according to exemplary embodiments.

[0021] FIG. 2 is a perspective view showing a cell assembly according to exemplary embodiments.

[0022] FIG. 3 is a perspective view showing a pack cross beam according to exemplary embodiments.

[0023] FIG. 4 is a perspective view showing a part of a battery pack according to exemplary embodiments.

[0024] FIG. 5 is a plan view showing a part of a battery pack according to exemplary embodiments.

[0025] FIG. 6 is a cross-sectional view showing a part of a battery pack according to exemplary embodiments.

[0026] FIG. 7 is a perspective view showing a part of a battery pack according to exemplary embodiments.

[0027] FIG. 8 is a perspective view showing a pack cross beam according to exemplary embodiments.

[0028] FIG. 9 is a perspective view showing a part of a battery pack according to exemplary embodiments.

[0029] FIG. 10 is a perspective view showing a pack cross beam according to exemplary embodiments.

[0030] FIG. 11 is a perspective view showing a side beam according to exemplary embodiments.

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0032] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0033] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0034] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0035]

[0036] (1st embodiment)

[0037] FIG. 1 is a perspective view showing a battery pack (10) according to exemplary embodiments. FIG. 2 is a perspective view showing a cell assembly (300) according to exemplary embodiments. FIG. 3 is a perspective view showing a pack cross beam (200) according to exemplary embodiments. FIG. 4 is a perspective view showing a part of a battery pack (10) according to exemplary embodiments. FIG. 5 is a plan view showing a part of a battery pack (10) according to exemplary embodiments. FIG. 6 is a cross-sectional view showing a part of a battery pack (10) according to exemplary embodiments.

[0038] Referring to FIGS. 1 to 6, the battery pack (10) may include a pack frame (100), a pack cross beam (200), and a plurality of cell assemblies (300).

[0039] The pack frame (100) may provide an internal space for accommodating a plurality of cell assemblies (300). The pack frame (100) may include a base frame (110), a pair of side frames (120), a front frame (130), and a rear frame (140).

[0040] A base frame (110) can support a plurality of cell assemblies (300). The base frame (110) may have a flat plate shape extending approximately in a first horizontal direction (e.g., X-axis direction) and a second horizontal direction (e.g., Y-axis direction). The base frame (110) may include a cooling channel configured to allow a cooling fluid to flow. A cooling fluid provided from outside the base frame (110) may be supplied to the inlet of the cooling channel, flow along the cooling channel, and be discharged to the outside through the outlet of the cooling channel. While the cooling fluid flows along the cooling channel, cooling of the cell assembly (300) may be achieved. The cooling fluid may include a coolant and / or a refrigerant.

[0041] A pair of side frames (120) may be attached to a base frame (110). A pair of side frames (120) may be attached around the base frame (110). Each side frame (120) may extend along the edge of the base frame (110) in a first horizontal direction (e.g., X-axis direction). Each side frame (120) may face the side of at least one corresponding cell assembly (300) among a plurality of cell assemblies (300). A pair of side frames (120) may be spaced apart from each other in a second horizontal direction (e.g., Y-axis direction).

[0042] The front frame (130) can be coupled to the base frame (110). The front frame (130) can be extended along the frontside edge of the base frame (110). The front frame (130) can be extended in a second horizontal direction (e.g., the Y-axis direction) between a pair of side frames (120).

[0043] The rear frame (140) can be coupled to the base frame (110). The front frame (130) can be extended along the backside edge of the base frame (110). The rear frame (140) can be extended in a second horizontal direction (e.g., Y-axis direction) between a pair of side frames (120). The rear frame (140) can be spaced apart from the front frame (130) in a first horizontal direction (e.g., X-axis direction) with a plurality of cell assemblies (300) in between.

[0044] The rear frame (140), the front frame (130), and a pair of side frames (120) may form a square-ring shaped perimeter wall surrounding a plurality of cell assemblies (300). The pack frame (100) may further include a pack cover (not shown) coupled on the rear frame (140), the front frame (130), and a pair of side frames (120) to cover the plurality of cell assemblies (300).

[0045] The pack cross beam (200) may be positioned within the internal space of the pack frame (100). The pack cross beam (200) may be coupled to the base frame (110) and may extend in a second horizontal direction (e.g., Y-axis direction) between a pair of side frames (120). The pack cross beam (200) may be coupled to at least one of the pair of side frames (120). In exemplary embodiments, one side of the pack cross beam (200) along the second horizontal direction (e.g., Y-axis direction) may be coupled to one of the pair of side frames (120), and the other side of the pack cross beam (200) along the second horizontal direction (e.g., Y-axis direction) may be coupled to the other side of the pair of side frames (120). The pack cross beam (200) may partition or separate the internal space of the pack frame (100) into a plurality of sub-spaces. At least one cell assembly (300) may be disposed in each of the plurality of sub-spaces of the pack frame (100) defined by the pack cross beam (200). The pack cross beam (200) may be disposed between cell assemblies (300) adjacent to each other in a first horizontal direction (e.g., X-axis direction) among the plurality of cell assemblies (300). A plurality of pack cross beams (200) may be provided within the receiving space of the pack frame (100). The plurality of pack cross beams (200) may be spaced apart from each other in a first horizontal direction (e.g., X-axis direction).

[0046] The battery pack (10) may further include a bonding layer (410) that bonds the pack cross beam (200) to the side frame (120). The bonding layer (410) may be interposed between the inner side of the side frame (120) and the side of the pack cross beam (200) facing the inner side of the side frame (120). The bonding layer (410) may extend along the edge of the side of the pack cross beam (200) facing the inner side of the side frame (120).

[0047] The bonding layer (410) can be formed through a welding process. For example, the welding process may include arc welding, gas welding, electric resistance welding and / or solid-state welding. The bonding layer (410) may include a weld metal. For example, the bonding layer (410) may include aluminum (Al), silver (Ag), copper (Cu), zinc (Zn), tin (Sn), or a combination thereof.

[0048] A plurality of cell assemblies (300) may be mounted on a base frame (110). A plurality of cell assemblies (300) may be arranged on the base frame (110) in a first horizontal direction (e.g., X-axis direction) and / or a second horizontal direction (e.g., Y-axis direction). In FIG. 1, the cell assemblies (300) are illustrated as being arranged in two rows and two columns, but the number of cell assemblies (300) provided in the battery pack (10) and the arrangement of the cell assemblies (300) are not limited thereto.

[0049] Each individual cell assembly (300) may include a cell block (310) comprising a plurality of battery cells (311) and a side beam (320). Each individual cell assembly (300) may correspond to a cell-to-pack unit or a battery module.

[0050] An individual battery cell (311) is a basic unit of a lithium-ion battery, i.e., a secondary battery. An individual battery cell (311) may include an electrode assembly, an electrolyte, and a cell case. The electrode assembly embedded in the cell case may include a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. Depending on the assembly form, the electrode assembly may be either a jelly-roll type or a stack type. A jelly-roll type electrode assembly may include a wound structure of a positive electrode, a negative electrode, and a separator interposed between them. A stack type electrode assembly may include a plurality of positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed between them, which are stacked sequentially. The positive electrode may include a positive current collector and a positive active material. The negative electrode may include a negative current collector and a negative active material.

[0051] The individual battery cells (311) may correspond to pouch-type battery cells, cylindrical battery cells, or prismatic battery cells. The electrode assembly of a pouch-type battery cell is embedded in a pouch case containing an aluminum laminate sheet. The electrode assembly of a cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of a prismatic battery cell is embedded in a prismatic metal can.

[0052] A plurality of battery cells (311) provided in an individual cell assembly (300) may be connected in series and / or in parallel. For example, a plurality of battery cells (311) may be connected in series with each other. For example, a plurality of battery cells (311) may be connected in parallel with each other. For example, when a set of two or more battery cells (311) connected in parallel is defined as a bank, one bank consisting of two or more battery cells (311) connected in parallel with each other and another bank consisting of two or more battery cells (311) connected in parallel with each other may be connected in series.

[0053] In exemplary embodiments, a plurality of battery cells (311) may be arranged and stacked in a first horizontal direction (e.g., X-axis direction), and individual battery cells (311) may be extended in a second horizontal direction (e.g., Y-axis direction). An electrode lead may be provided at least one of the two ends of an individual battery cell (311) along the second horizontal direction (e.g., Y-axis direction). The electrode leads of adjacent battery cells (311) among the plurality of battery cells (311) may be electrically and physically connected to each other.

[0054] A plurality of battery cells (311) provided in individual cell assemblies (300) can be attached to a base frame (110) by an adhesive layer formed of an adhesive material such as resin.

[0055] The side beam (320) can be connected to the cell block (310) to cover one side of the cell block (310). The side beam (320) can be extended along the pack cross beam (200) in a second horizontal direction (e.g., the Y-axis direction). The side beam (320) can be fastened to the pack cross beam (200) by fastening bolts (430).

[0056] The side beam (320) may include a side body (321) connected to the cell block (310) and an upper body (323) connected to the upper part of the side body (321). The side body (321) may be positioned between the cell block (310) and the pack cross beam (200). The side body (321) may have a plate shape that covers the side of the cell block (310) and extends along the side of the cell block (310). The upper body (323) may be seated on the pack cross beam (200). The bottom surface of the upper body (323) may be configured to make surface contact with the upper surface of the pack cross beam (200). The upper body (323) may be fastened to the pack cross beam (200) by fastening bolts (430). A fastening bolt (430) is inserted into a hole in the upper body (323) and a hole in the pack cross beam (200) aligned in a vertical direction (e.g., Z-axis direction) so as to fasten the upper body (323) to the pack cross beam (200).

[0057] Each individual cell assembly (300) may include a pair of side beams (320) spaced apart in a first horizontal direction (e.g., X-axis direction) with the cell block (310) in between. One of the pair of side beams (320) may be connected to one side of the cell block (310) along the first horizontal direction (e.g., X-axis direction), and the other of the pair of side beams (320) may be connected to the other side of the cell block (310) along the first horizontal direction (e.g., X-axis direction). Each of the pair of side beams (320) may be connected to a corresponding pack cross beam (200) among the pack cross beams (200).

[0058] The pack cross beam (200) may include a first portion (210) that overlaps the side beam (320) in a vertical direction (e.g., Z-axis direction) and a second portion (220) that protrudes in a second horizontal direction (e.g., Y-axis direction) from the end (329) of the side beam (320) facing the inner surface of the side frame (120). The first portion (210) of the pack cross beam (200) may contact the upper body (323) of the side beam (320). The second portion (220) of the pack cross beam (200) may not overlap the side beam (320) in a vertical direction (e.g., Z-axis direction). When viewed in a plane, the second portion (220) of the pack cross beam (200) may be located between the end (329) of the side beam (320) and the inner surface of the side frame (120). The distance along the second horizontal direction (e.g., Y-axis direction) between the inner side of the side frame (120) and the end (329) of the side beam (320) may be greater than the distance along the second horizontal direction (e.g., Y-axis direction) between the inner side of the side frame (120) and the pack cross beam (200). The end (329) of the side beam (320) may be spaced apart from the inner side of the side frame (120) in the second horizontal direction (e.g., Y-axis direction) with the first gap (G1) in between. The distance between the end (329) of the side beam (320) and the inner side of the side frame (120) may have a range of several mm to several tens of mm.

[0059] In the battery pack according to the comparative example, the connection between the pack cross beam and the side frame is achieved by bolts inserted into the pack cross beam and the side frame in the horizontal direction. In the case of the battery pack according to the comparative example, a gasket is required to seal the portion of the side frame where the bolt is inserted, which may increase the manufacturing cost of the battery pack and there is a risk that the connection between the pack cross beam and the side frame may be damaged by external vibrations.

[0060] According to exemplary embodiments, the rigidity of the battery pack (10) can be improved by achieving the connection between the pack cross beam (200) and the side frame (120) through welding.

[0061] According to exemplary embodiments, a first gap (G1) is provided between the side beam (320) and the side frame (120), so that when assembling the side beam (320) to the pack cross beam (200), the side beam (320) can be prevented from interfering with the joint layer (410) formed by welding, and the assembly between the side beam (320) and the pack cross beam (200) can be made easier.

[0062] According to exemplary embodiments, the first gap (G1) provided between the side beam (320) and the side frame (120) can be utilized as a path for transmitting a wireless signal within the battery pack (10), thereby improving wireless communication performance within the battery pack (10).

[0063]

[0064] (2nd Example)

[0065] FIG. 7 is a perspective view showing a portion of a battery pack according to exemplary embodiments. FIG. 8 is a perspective view showing a pack cross beam (200A) according to exemplary embodiments. Hereinafter, the battery pack illustrated in FIG. 7 and FIG. 8 will be described with a focus on the differences from the battery pack (10) described with reference to FIG. 1 to 6.

[0066] Referring to FIGS. 7 and 8, the second portion (220) of the pack cross beam (200A) may include an extension (230) provided between the side frame (120) and the upper body (323) of the side beam (320). The second portion (220) of the pack cross beam (200A) may be within a first gap (G1) provided between the end (329) of the side beam (320) and the side frame (120). The extension (230) of the second portion (220) of the pack cross beam (200A) may protrude upward from the upper surface of the first portion (210) of the pack cross beam (200A) and may extend vertically (e.g., in the Z-axis direction) along the inner surface of the side frame (120).

[0067] The bonding layer (410) can be extended along the extension (230) of the second part (220) of the pack cross beam (200A). Since the second part (220) of the pack cross beam (200A) that is coupled to the side frame (120) has the extension (230), the length of the bonding layer (410) formed by welding can be increased, and the bond between the side frame (120) and the pack cross beam (200A) can be strengthened. Thus, the rigidity of the battery pack can be improved.

[0068]

[0069] (3rd Example)

[0070] FIG. 9 is a perspective view showing a portion of a battery pack according to exemplary embodiments. FIG. 10 is a perspective view showing a pack cross beam (200B) according to exemplary embodiments. FIG. 11 is a perspective view showing a side beam (320A) according to exemplary embodiments. Hereinafter, the battery pack illustrated in FIG. 9 to FIG. 11 will be described with a focus on the differences from the battery pack described with reference to FIG. 7 and FIG. 8.

[0071] Referring to FIGS. 9 to 11, at the point where the first part (210) of the pack cross beam (200B) and the side beam (320A) meet, the first part (210) of the pack cross beam (200B) and the side beam (320A) may each have an inclined structure. The upper surface of the first part (210) of the pack cross beam (200B), on which the upper body (323) of the side beam (320A) is seated, may include a first surface (211) and a second surface (213). The first surface (211) of the first part (210) of the pack cross beam (200B) may be a plane extending in a first horizontal direction (e.g., X-axis direction) and a second horizontal direction (e.g., Y-axis direction), and the second surface (213) of the first part (210) of the pack cross beam (200B) may be an inclined surface extending at an angle with respect to the first surface (211) of the first part (210) of the pack cross beam (200B). The bottom surface of the upper body (323) of the side beam (320A) in contact with the first part (210) of the pack cross beam (200B) may include a first surface (325) and a second surface (327). The first surface (325) of the upper body (323) of the side beam (320A) may be a plane extending in a first horizontal direction (e.g., X-axis direction) and a second horizontal direction (e.g., Y-axis direction), and the second surface (327) of the upper body (323) of the side beam (320A) may be an inclined surface extending at an angle relative to the first surface (325) of the upper body (323) of the side beam (320A). The first surface (325) of the upper body (323) of the side beam (320A) may make surface contact with the first surface (211) of the first part (210) of the pack cross beam (200B), and the second surface (327) of the upper body (323) of the side beam (320A) may make surface contact with the second surface (213) of the first part (210) of the pack cross beam (200B).

[0072] According to exemplary embodiments, an inclined structure is applied to the area where the first part (210) of the pack cross beam (200B) and the side beam (320A) meet, so that assembly between the pack cross beam (200B) and the side beam (320A) can be made easier.

[0073]

[0074] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. A cell assembly comprising a cell block having multiple battery cells and a side beam connected to the cell block; A pack frame comprising a base frame supporting the cell assembly and a side frame facing the side of the cell assembly; and A pack cross beam connected to the above side frame and the above base frame and extending in a first direction; Includes, The first end of the side beam facing the side frame is spaced apart from the side frame in the first direction with a first gap in between, The above pack cross beam is, A first portion superimposed on the above side beam; and A second part protruding in the first direction from the first end of the side beam and coupled to the side frame; A battery pack characterized by including 2. In Paragraph 1, A battery pack characterized by further including a bonding layer that bonds the second portion of the above-mentioned pack cross beam to the side frame.

3. In Paragraph 2, A battery pack characterized by the above bonding layer extending along the edge of the side of the pack cross beam facing the side frame.

4. In Paragraph 2, A battery pack characterized in that the bonding layer comprises metal.

5. In Paragraph 1, A battery pack characterized in that the distance along the first direction between the side frame and the side beam is greater than the distance along the first direction between the side frame and the pack cross beam.

6. In Paragraph 1, The above side beam is, A side body provided between the cell block and the pack cross beam; and An upper body seated on the above-mentioned pack cross beam and coupled to the first portion of the above-mentioned pack cross beam; A battery pack characterized by including 7. In Paragraph 6, A battery pack characterized in that the second portion of the above-mentioned pack cross beam includes an extension provided between the side frame and the upper body of the above-mentioned side beam.

8. In Paragraph 7, It further includes a bonding layer that bonds the second portion of the above-mentioned pack cross beam to the side frame, and A battery pack characterized in that the bonding layer extends along the extension of the second portion of the pack cross beam.

9. In Paragraph 6, A battery pack characterized by further including a fastening bolt that fastens the upper body of the side beam to the first part of the pack cross beam.

10. In Paragraph 6, A bonding layer for bonding the second portion of the above-mentioned pack cross beam to the side frame; and A fastening bolt for fastening the upper body of the above side beam to the first part of the above pack cross beam; Includes more, The second portion of the above-mentioned pack cross beam includes an extension provided between the side frame and the upper body of the side beam, and A battery pack characterized in that the bonding layer extends along the extension of the second portion of the pack cross beam.

11. In Paragraph 6, The first portion of the above-mentioned pack cross beam includes an inclined surface, and A battery pack characterized in that the upper body of the above side beam includes an inclined surface in contact with the inclined surface of the above pack cross beam.

12. In Paragraph 6, The first portion of the above-mentioned pack cross beam includes a first surface and a second surface inclined with respect to the first surface, and The upper body of the above-mentioned side beam includes a third surface and a fourth surface inclined with respect to the third surface, and A battery pack characterized in that the first surface of the first part of the pack cross beam contacts the third surface of the upper body of the side beam, and the second surface of the first part of the pack cross beam contacts the fourth surface of the upper body of the side beam.

13. In Paragraph 1, A battery pack characterized in that the plurality of battery cells are arranged in a second direction perpendicular to the first direction.

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