Battery pack

Abstract

According to exemplary embodiments, a battery pack is provided. The battery pack may comprise: a pack housing including a base plate, a center beam extending in a first direction on the base plate, and a cross beam that is on the base plate, intersects the center beam, and extends in a second direction perpendicular to the first direction; battery cell assemblies on the base plate; and a first adhesive layer between the cross beam and the base plate.

Description

battery pack

[0001] The present invention relates to a battery pack. The present application claims the benefit of Korean application No. 10-2024-0158836, filed on November 11, 2024, which is incorporated herein by reference in its entirety.

[0002]

[0003] 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 vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] The technological development trend for rechargeable batteries in mobility is the improvement of energy density and safety. Here, the energy density of a rechargeable battery is defined as the maximum electrical energy that can be stored by the battery's mass. As high energy density is directly linked to driving efficiency and range in mobility applications, various studies are being conducted to improve this energy density.

[0005] One of the powerful solutions for increasing the energy density of secondary batteries is the modular type battery pack (or cell-to-pack structure). Since the modules covering the battery cells are omitted in the modular type battery pack, the mass of the battery pack can be drastically reduced.

[0006]

[0007] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with enhanced impact resistance and safety.

[0008]

[0009] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack is provided. The battery pack may include: a pack housing comprising a base plate, a center beam extending in a first direction on the base plate, and a cross beam on the base plate extending in a second direction that intersects the center beam and is perpendicular to the first direction; a battery cell assembly on the base plate; and a first adhesive layer between the cross beam and the base plate.

[0010] The battery cell assembly may further include a cell stack comprising a plurality of battery cells arranged in the first direction; and a side beam on the side of the cell stack in the first direction. The battery pack may further include bolts for fastening the side beam to the cross beam.

[0011] Each of the above bolts may be spaced apart from the base plate in a third direction perpendicular to the first and second directions, respectively.

[0012] The above side beam may include a plurality of recessed portions that each accommodate the above bolts.

[0013] The above cross beam may further include bolts for fastening to the center beam.

[0014] It may further include a second adhesive layer between the center beam and the cross beam.

[0015] The above pack housing may further include side walls on the base plate parallel to the center beam. The battery pack may further include welded layers between each of the side walls and the cross beam.

[0016] It may further include a weld layer between the center beam and the cross beam.

[0017] The first adhesive layer may include a plurality of adhesive patterns spaced apart in the second direction. The battery pack may further include a plurality of welding patterns spaced apart in the second direction between the cross beam and the base plate. The adhesive patterns and the welding patterns may be arranged alternately.

[0018] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack is provided. The battery pack comprises: a base plate including cooling channels; a center beam extending in a first direction on the base plate; a cross beam on the base plate extending in a second direction perpendicular to the first direction and intersecting the center beam; a battery cell assembly on the base plate, wherein the battery cell assembly comprises a cell stack including a plurality of battery cells arranged in the first direction, and a side beam on the side of the cell stack in the first direction; and may include first bolts for fastening the side beam to the cross beam. Each of the first bolts may be spaced apart from the cooling channels in a third direction perpendicular to the first and second directions.

[0019] It may further include an adhesive layer between the base plate and the cross beam.

[0020] It may further include an adhesive layer between the center beam and the cross beam.

[0021] It may further include a weld layer between the center beam and the cross beam.

[0022] It may further include side walls perpendicular to the base plate and the cross beam, respectively; and welded layers between the cross beam and the side walls.

[0023] The above side beam may include a plurality of recessed portions that accommodate each of the above first bolts.

[0024]

[0025] According to exemplary embodiments of the present invention, the impact resistance of a battery pack can be improved by assembling a battery pack by bolting a side beam to a cross beam welded and / or adhesively bonded to a pack housing. In addition, safety can be enhanced by increasing the cooling performance of the battery pack through the expansion of the cooling channel.

[0026] 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.

[0027]

[0028] FIG. 1 is a top view showing a battery pack according to exemplary embodiments.

[0029] FIG. 2 is a cross-sectional view showing a battery pack according to exemplary embodiments.

[0030] FIG. 3 is a cross-sectional view showing a battery pack according to exemplary embodiments.

[0031] FIG. 4 is a cross-sectional view showing a battery pack according to exemplary embodiments.

[0032] FIG. 5 is a cross-sectional view showing a battery pack according to exemplary embodiments.

[0033]

[0034] 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. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0035] 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.

[0036] 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.

[0037] 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.

[0038]

[0039] (1st embodiment)

[0040] FIG. 1 is a top view showing a battery pack (100) according to exemplary embodiments. FIG. 2 and FIG. 3 are cross-sectional views showing a battery pack (100) according to exemplary embodiments. FIG. 2 shows a cross-section along A-A' of FIG. 1. FIG. 3 shows a cross-section along B-B' of FIG. 1. In FIG. 1, the bolts (131, 132) of FIG. 2 and FIG. 3 are omitted.

[0041]

[0042] Referring to FIGS. 1 to 3, the battery pack (100) may include a pack housing (110) and battery cell assemblies (120_1, 120_2). The battery pack (100) may be the final form of a battery system mounted on a mobility device, etc.

[0043] The pack housing (110) may provide a space for arranging a plurality of battery cell assemblies (120_1, 120_2). The pack housing (110) may include a base plate (111), a center beam (112), cross beams (113A, 113B), and side walls (114A, 114B, 114C, 114D).

[0044] Two directions substantially parallel to the mounting surface (111M) of the base plate (111) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface (111M) of the base plate (111) is defined as the Z direction. Each of the X direction, the Y direction, and the Z direction may be substantially perpendicular to one another. Unless otherwise noted, the definitions of directions are the same for the following drawings.

[0045] The center beam (112) may be on the base plate (111). According to exemplary embodiments, the center beam (112) may protrude from the mounting surface (111M) of the base plate (111). The center beam (112) may extend in the X direction. The center beam (112) may separate the battery cell assemblies (120_1, 120_2) in the Y direction.

[0046] The cross beams (113A, 113B) may be on the base plate (111). Each of the cross beams (113A, 113B) may intersect the center beam (112). Each of the cross beams (113A, 113B) may extend in the Y direction. Each of the cross beams (113A, 113B) may separate the battery cell assemblies (120_1, 120_2) in the X direction.

[0047] The side walls (114A, 114B, 114C, 114D) are connected to the base plate (111) and may be substantially perpendicular to the base plate (111). The side walls (114A, 114B, 114C, 114D) may extend along the edge of the base plate (111). The side walls (114A, 114B, 114C, 114D) may surround the center beam (112), cross beams (113A, 113B), and battery cell assemblies (120_1, 120_2). Each of the side walls (114A, 114C) may be substantially parallel to the center beam (112). Each of the side walls (114A, 114C) may be substantially perpendicular to each of the cross beams (113A, 113B). Each of the side walls (114B, 114D) may be substantially perpendicular to the center beam (112). Each of the side walls (114B, 114D) may be substantially parallel to each of the cross beams (113A, 113B).

[0048]

[0049] Each cross beam (113A, 113B) can be joined to the pack housing (110) by adhesive layers (141, 142) and welding layers (151).

[0050] Each cross beam (113A, 113B) can be bonded to a base plate (111) by an adhesive layer (141). The adhesive layer (141) can be interposed between the base plate (111) and each cross beam (113A, 113B). The adhesive layer (141) can be in contact with the mounting surface (111M) of the base plate (111). The adhesive layer (141) can be in contact with the surface (113S1) of each cross beam (113A, 113B). The adhesive layer (141) may include one or more of epoxy, polyurethane, acrylic, and silicone, but the type of adhesive layer (141) is not limited thereto.

[0051] Each cross beam (113A, 113B) can be joined to the center beam (112) by an adhesive layer (142). The adhesive layer (142) can be interposed between the center beam (112) and each cross beam (113A, 113B). The adhesive layer (142) can be in contact with the upper surface of the center beam (112). The adhesive layer (142) can be in contact with the surface (113S2) of each cross beam (113A, 113B). Although FIG. 2 illustrates an embodiment in which the adhesive layer (142) is in contact with the upper surface of the center beam (112), it is not limited thereto, and the adhesive layer (142) can be extended to be in contact with the upper surface and both sides of the center beam (112). The adhesive layer (142) may include one or more of epoxy, polyurethane, acrylic, and silicone, but the type of adhesive layer (142) is not limited thereto.

[0052] Each cross beam (113A, 113B) can be joined to the center beam (112) by a bolt (132). The bolt (132) can be configured to pass through each cross beam (113A, 113B) and the adhesive layer (142) to fasten each cross beam (113A, 113B) to the center beam (112). The bolt (132) can be spaced apart from the cooling channels (115) in the Z direction.

[0053] Each cross beam (113A, 113B) can be joined to the side walls (114A, 114C) by welding layers (151). The welding layers (151) can be interposed between each cross beam (113A, 113B) and the side wall (114A). The welding layers (151) can be interposed between each cross beam (113A, 113B) and the side wall (114C). The welding layers (151) can be in contact with the sides (113S3) of each cross beam (113A, 113B). The welding layers (151) can be in contact with the inner surface of the side wall (114A). The welding layers (151) can be in contact with the inner surface of the side wall (114C). The weld layers (151) can be formed by any one of the following methods: Metal Inert Gas (MIG) welding, resistance welding, laser welding, and ultrasonic welding. However, the method of forming the weld layers (151) is not limited thereto.

[0054]

[0055] Cooling channels (115) may be located at the bottom of the battery cell assemblies (120_1, 120_2). Cooling channels (115) may overlap with the battery cell assemblies (120_1, 120_2) in the Z direction. According to exemplary embodiments, the cooling channels (115) may be embedded in the base plate (111). The cooling channels (115) may provide a passage for the flow of a coolant, such as water. The coolant flowing through the cooling channels (115) may absorb heat generated from the battery cell assemblies (120_1, 120_2) to cool the battery cell assemblies (120_1, 120_2).

[0056]

[0057] Each of the battery cell assemblies (120_1, 120_2) may include battery cells (121C), separators (121S), and side beams (122A, 122B). According to exemplary embodiments, each of the battery cell assemblies (120_1, 120_2) may not include a module frame.

[0058] A plurality of battery cells (121C) and a plurality of separators (121S) may form a cell stack (121). According to exemplary embodiments, each of the plurality of battery cells (121C) may be bidirectional cells. That is, the positive terminal of each of the plurality of battery cells (121C) may be placed at each end, and the negative terminal of each of the plurality of battery cells (121C) may be placed at each other end. A person skilled in the art will be able to easily arrive at an embodiment in which each of the plurality of battery cells (121C) is a unidirectional cell based on what is described herein.

[0059] Each of the plurality of battery cells (121C) may include an electrode assembly, an electrolyte, and a case covering them. The case may be any one of a pouch case, a cylindrical case, and a prismatic case. The pouch case may include an aluminum laminate sheet. The prismatic case and the cylindrical case may include a metallic material such as aluminum. The prismatic case may have a rectangular prism shape. The cylindrical case may have a cylinder shape.

[0060] An electrode assembly embedded in a case includes 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 the positive and negative electrodes. A stack type electrode assembly includes a plurality of positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed between them, which are stacked sequentially. According to exemplary embodiments, a plurality of battery cells (121C) connected in parallel may form a plurality of banks, and the plurality of banks may be connected in series. Depending on the number of battery cells (121C) included in each of the plurality of banks, the output current of each of the battery cell assemblies (120_1, 120_2) may be determined. Depending on the number of banks connected in series with each other, the output voltage of each of the battery cell assemblies (120_1, 120_2) may be determined.

[0061] A plurality of separators (121S) may be interposed between a plurality of battery cells (121C). The plurality of separators (121S) may include a compressible material. The plurality of separators (121S) may absorb swelling of the plurality of battery cells (121C).

[0062] According to exemplary embodiments, a plurality of separators (121S) may be thermal barriers. According to exemplary embodiments, each of the plurality of separators (121S) may have a high melting temperature and low thermal conductivity. According to exemplary embodiments, each of the plurality of separators (121S) may include a flame-retardant material such as ceramic and coated glass material. According to exemplary embodiments, the plurality of separators (121S) may be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0063] In this example, the battery cell assemblies (120_1, 120_2) are arranged in 2 rows and 2 columns. Accordingly, the battery cell assemblies (120_1, 120_2) can be said to be arranged in a 2 * 2 configuration. A person skilled in the art will be able to easily arrive at a battery pack comprising battery cell assemblies (120_1, 120_2) arranged in an M * N configuration based on what is described herein. Here, M and N are each arbitrary integers greater than or equal to 2.

[0064]

[0065] Side beams (122A, 122B) may be located on both sides of the cell stack (121) in the X direction. Side beams (122A, 122B) may be fixed to the cell stack (121) by an adhesive material or the like. Side beams (122A, 122B) may be spaced apart from each other with the cell stack (121) in between. Side beams (122A, 122B) may overlap with battery cells (121C) and separators (121S) in the X direction.

[0066] Each side beam (122A, 122B) may have a shape symmetric to the cell stack (121). Each side beam (122A, 122B) may have a Γ shape. The side beam (122A) of the battery cell assembly (120_1) may have a shape complementary to the side wall (114D). The side beam (122B) of the battery cell assembly (120_1) may have a shape complementary to the cross beam (113A). The side beam (122A) of the battery cell assembly (120_2) may have a shape complementary to the cross beam (113A). The side beam (122B) of the battery cell assembly (120_2) may have a shape complementary to the cross beam (113B). According to exemplary embodiments, each side beam (122A, 122B) may be manufactured by extrusion.

[0067] Side beams (122A, 122B) can be fastened to the pack housing (110) by bolts (131). Each side beam (122A, 122B) may include a plurality of recessed sections (122R). Each bolt (131) can be received in each recessed section (122R). The bolts (131) can pass through the side beams (122A, 122B) to fasten the side beams (122A, 122B) to the cross beams (113A, 113B) or the side wall (114D). The side beam (122A) of the battery cell assembly (120_1) can be fastened to the side wall (114D). The side beam (122B) of the battery cell assembly (120_1) can be fastened to the cross beam (113A). The side beam (122A) of the battery cell assembly (120_2) can be fastened to the cross beam (113A). The side beam (122B) of the battery cell assembly (120_2) can be fastened to the cross beam (113B). The bolts (131) can be spaced apart from the base plate (111) in the Z direction. The bolts (131) can be spaced apart from the cooling channels (115) in the Z direction.

[0068] The side beam (122B) of the battery cell assembly (120_1) may face the side beam (122A) of the battery cell assembly (120_2). The side beam (122B) of the battery cell assembly (120_1) may be spaced apart from the side beam (122A) of the battery cell assembly (120_2) in the X direction.

[0069] According to exemplary embodiments, in each of the battery cell assemblies (120_1, 120_2), a plurality of recessed portions (122R) of the side beam (122A) may be oriented in the opposite direction to the plurality of recessed portions (122R) of the side beam (122B) with respect to the cell stack (121). According to exemplary embodiments, each of the plurality of recessed portions (122R) of the side beam (122B) of the battery cell assembly (120_1) may face each of the plurality of recessed portions (122R) of the side beam (122A) of the battery cell assembly (120_2). According to exemplary embodiments, each of the plurality of recessed portions (122R) of the side beam (122B) of the battery cell assembly (120_1) may be aligned in the X direction with each of the plurality of recessed portions (122R) of the side beam (122A) of the battery cell assembly (120_2).

[0070]

[0071] The width of the cross beam (113A) in the X direction may be greater than the width of the cross beam (113B) in the X direction. The width of the cross beam (113A) in the X direction may be greater than the width of the side wall (114D) in the X direction. According to exemplary embodiments, the width of the cross beam (113B) in the X direction may be substantially the same as the width of the side wall (114D) in the X direction.

[0072] The height in the Z direction of each of the cross beams (113A, 113B) may be substantially the same as the height of the side wall (114D). The height in the Z direction of each of the cross beams (113A, 113B) may be smaller than the height in the Z direction of each of the side walls (114A, 114B, 114C). The height in the Z direction of the side wall (114D) may be smaller than the height in the Z direction of each of the side walls (114A, 114B, 114C).

[0073] The height in the Z direction of each of the side beams (122A, 122B) may be substantially the same as the height in the Z direction of each of the side walls (114A, 114B, 114C). The height in the Z direction of each of the side beams (122A, 122B) may be greater than the height in the Z direction of the side wall (114D). The height in the Z direction of each of the side beams (122A, 122B) may be greater than the height in the Z direction of each of the cross beams (113A, 113B).

[0074] The height of the cell stack (121) in the Z direction may be greater than the height of each of the cross beams (113A, 113B) in the Z direction. The height of the cell stack (121) in the Z direction may be greater than the height of the side wall (114D) in the Z direction. The height of the cell stack (121) in the Z direction may be smaller than the height of each of the side beams (122A, 122B) in the Z direction. The height of the cell stack (121) in the Z direction may be smaller than the side walls (114A, 114B, 114C).

[0075]

[0076] A battery pack (100) can be manufactured by joining cross beams (113A, 113B) to a pack housing (110) and then joining battery cell assemblies (120_1, 120_2) to the cross beams (113A, 113B).

[0077] According to exemplary embodiments, each cross beam (113A, 113B) can be joined to a pack housing (110) by applying an adhesive layer (141) to the surface (113S1) of each cross beam (113A, 113B) and applying an adhesive layer (142) to the surface (113S2). Subsequently, weld layers (151) can be formed in the gap between each cross beam (113A, 113B) and the side walls (114A, 114C) using MIG welding or the like. In addition, each cross beam (113A, 113B) can be fastened to a center beam (112) with a bolt (132). After mounting each battery cell assembly (120_1, 120_2) inside the pack housing (110), the side beams (122A, 122B) of each battery cell assembly (120_1, 120_2) can be bolted to the pack housing (110) using bolts (131).

[0078] That is, each cross beam (113A, 113B) can be joined to the pack housing (110) by adhesive layers (141, 142), welding layers (151), and bolts (132). Each side beam (122A, 122B) can be joined to each cross beam (113A, 113B) and side wall (114D) joined to the pack housing (110) by bolts (131). Accordingly, the side beams (122A, 122B) can be secured to the pack housing (110) even if each bolt (131) is not directly fastened to the base plate (111).

[0079] As the bolts (131) are spaced apart from the base plate (111) in the Z direction, the constraints on the shape of the cooling channels (115) of the base plate (111) can be reduced. As a result, the cooling channels (115) can be expanded, thereby improving the cooling performance of the battery pack (100) by the cooling channels (115).

[0080] Additionally, since each cross beam (113A, 113B) is joined to the side walls (114A, 114C) by welding layers (151), the battery pack (100) may not include side bolts that fasten the cross beams (113A, 113B) to the side walls (114A, 114C). Accordingly, even if vibration or impact in the Z direction is applied to the battery pack (100), the problem of the side bolts being damaged by shear force can be prevented. In addition, since the assembly process involving the fastening of side bolts is eliminated, the efficiency of the assembly process can be improved.

[0081]

[0082] (2nd Example)

[0083] FIG. 4 is a cross-sectional view showing a battery pack (100') according to exemplary embodiments. FIG. 4 illustrates a cross-section along A-A' of FIG. 1.

[0084] In FIG. 4, for components having the same drawing numbers as FIG. 1 to FIG. 3, the description above in the first embodiment may be applied, and the same description will be omitted. Hereinafter, the description will focus on the components of the second embodiment that differ from the first embodiment.

[0085]

[0086] Referring to FIGS. 1 and FIGS. 4, the battery pack (100') may include a weld layer (152) between the center beam (112) and each cross beam (113A, 113B). The weld layer (152) may be in contact with the surfaces (113S2, 113S3) of each cross beam (113A, 113B). The weld layer (152) may be in contact with the top surface and both sides of the center beam (112). The battery pack (100') may not include bolts (132 in FIG. 2) that fasten the center beam (112) and each cross beam (113A, 113B) by including the weld layer (152).

[0087] A battery pack (100') can be manufactured by joining cross beams (113A, 113B) to a pack housing (110) and then joining battery cell assemblies (120_1, 120_2) to the cross beams (113A, 113B).

[0088] According to exemplary embodiments, each cross beam (113A, 113B) can be joined to a pack housing (110) by applying an adhesive layer (141) to the surface (113S1) of each cross beam (113A, 113B). Subsequently, weld layers (151) can be formed in the gap between each cross beam (113A, 113B) and the side walls (114A, 114C) using MIG welding or the like. Additionally, weld layers (152) can be formed in the gap between each cross beam (113A, 113B) and the center beam (112) using MIG welding or the like. After mounting each battery cell assembly (120_1, 120_2) inside the pack housing (110), each side beam (122A, 122B) of each battery cell assembly (120_1, 120_2) can be bolted to the cross beams (113A, 113B) and the side wall (114D) using bolts (131). However, the manufacturing method and sequence of the battery pack (100') are not limited to those described above and can be varied.

[0089]

[0090] (3rd Example)

[0091] FIG. 5 is a cross-sectional view showing a battery pack (100) according to exemplary embodiments. FIG. 5 illustrates a cross-section along A-A' of FIG. 1.

[0092] In FIG. 5, for components having the same drawing numbers as FIG. 1 to FIG. 3, the description above in the first embodiment may be applied, and the same description will be omitted. Hereinafter, the components of the third embodiment that differ from the first embodiment will be described in detail.

[0093]

[0094] Referring to FIGS. 1 and FIGS. 5, the battery pack (100) may further include a weld layer (152) between the center beam (112) and each cross beam (113A, 113B). The weld layer (152) may come into contact with the surfaces (113S2, 113S3) of each cross beam (113A, 113B). The weld layer (152) may come into contact with the top surface and both sides of the center beam (112). The battery pack (100) may not include bolts (132 in FIG. 2) that fasten the center beam (112) and each cross beam (113A, 113B) by including the weld layer (152).

[0095] Each cross beam (113A, 113B) can be joined to the base plate (111) by adhesive patterns (141') and welding patterns (153). The adhesive patterns (141') and welding patterns (153) can be interposed between the base plate (111) and each cross beam (113A, 113B).

[0096] The adhesive patterns (141') may be spaced apart from each other in the Y direction. According to exemplary embodiments, the adhesive patterns (141') may be arranged at equal intervals. The welding patterns (153) may be spaced apart from each other in the Y direction. According to exemplary embodiments, the welding patterns (153) may be arranged at equal intervals. The adhesive patterns (141') and the welding patterns (153) may be arranged alternately in the Y direction.

[0097] The adhesive patterns (141') and welding patterns (153) can be in contact with the mounting surface (111M) of the base plate (111). The adhesive patterns (141') and welding patterns (153) can be in contact with the surface (113S1) of each cross beam (113A, 113B).

[0098] According to exemplary embodiments, each cross beam (113A, 113B) can be joined to a pack housing (110) by applying adhesive patterns (141') to the surface (113S1) of each cross beam (113A, 113B). Subsequently, weld layers (151) can be formed in the gaps between each cross beam (113A, 113B) and the side walls (114A, 114C) using MIG welding or the like. A weld layer (152) can be formed in the gaps between each cross beam (113A, 113B) and the center beam (112) using MIG welding or the like. Weld patterns (153) can be formed in the gaps between each cross beam (113A, 113B) and the base plate (111) using MIG welding or the like. After mounting each battery cell assembly (120_1, 120_2) inside the pack housing (110), each side beam (122A, 122B) of each battery cell assembly (120_1, 120_2) can be bolted to the cross beams (113A, 113B) and side wall (114D) using bolts (131). However, the manufacturing method and sequence of the battery pack (100) are not limited to those described above and can be varied.

[0099]

[0100] 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 pack housing comprising a base plate, a center beam extending in a first direction on the base plate, and a cross beam on the base plate extending in a second direction perpendicular to the first direction and intersecting the center beam; Battery cell assembly on the base plate above; and A battery pack comprising a first adhesive layer between the cross beam and the base plate.

2. In Paragraph 1, The above battery cell assembly is, A cell stack comprising a plurality of battery cells arranged in the first direction; and The cell stack further comprises a side beam on the side in the first direction, and The battery pack is characterized by further including bolts for fastening the side beam to the cross beam.

3. In Paragraph 2, A battery pack characterized in that each of the above bolts is spaced apart from the base plate and in a third direction perpendicular to the first and second directions, respectively.

4. In Paragraph 2, A battery pack characterized in that the above-mentioned side beam includes a plurality of recessed portions each accommodating the above-mentioned bolts.

5. In Paragraph 1, A battery pack characterized by further including a bolt for fastening the cross beam to the center beam.

6. In Paragraph 1, A battery pack characterized by further including a second adhesive layer between the center beam and the cross beam.

7. In Paragraph 1, The above pack housing further includes side walls on the base plate parallel to the center beam, and The battery pack is characterized by further including welded layers between each of the side walls and the cross beam.

8. In Paragraph 1, A battery pack characterized by further including a weld layer between the center beam and the cross beam.

9. In Paragraph 1, The first adhesive layer comprises a plurality of adhesive patterns spaced apart in the second direction, and The battery pack further includes a plurality of welding patterns spaced apart in the second direction between the cross beam and the base plate, and A battery pack characterized in that the adhesive patterns and the welding patterns are arranged alternately.

10. A base plate including cooling channels; A center beam extending in a first direction on the base plate; A cross beam on the base plate that intersects the center beam and extends in a second direction perpendicular to the first direction; A battery cell assembly on the base plate, wherein the battery cell assembly comprises a cell stack including a plurality of battery cells arranged in the first direction, and a side beam on the side of the cell stack in the first direction; and It includes first bolts for fastening the side beam to the cross beam, and A battery pack, wherein each of the above first bolts is spaced apart from the cooling channels and in a third direction perpendicular to the first and second directions.

11. In Paragraph 10, A battery pack characterized by further including an adhesive layer between the base plate and the cross beam.

12. In Paragraph 10, A battery pack characterized by further including an adhesive layer between the center beam and the cross beam.

13. In Paragraph 10, A battery pack characterized by further including a weld layer between the center beam and the cross beam.

14. In Paragraph 10, Side walls perpendicular to the base plate and the cross beam, respectively; and A battery pack characterized by further including welded layers between the cross beam and the side walls.

15. In Paragraph 10, A battery pack characterized in that the above-mentioned side beam includes a plurality of recessed portions each accommodating the above-mentioned first bolts.

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