Battery pack

Abstract

The present disclosure relates to a battery pack including: a pack case including a lower case and an upper case defining an internal space; and a plurality of battery cell units including a plurality of battery cells and disposed within the internal space, in which each battery cell unit includes a plurality of battery cells stacked in the first direction and battery cell side beams disposed on both sides of the stacked plurality of battery cells. The battery cell side beams may be coupled to cross beams of the pack case.

Description

Technical Field

[0001] This disclosure relates to a battery pack, and more specifically, to a battery pack with improved productivity, improved energy density and structural stiffness.

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0120233, filed on September 11, 2023, the disclosure of which is incorporated herein by reference. Background Technology

[0003] Battery packs used in electric vehicles and other applications consist of multiple individual cells to achieve high power output. Each individual cell can be repeatedly charged and discharged through electrochemical reactions between components including a positive current collector, a negative current collector, a separator, active materials, and an electrolyte.

[0004] On the other hand, recent demand for high-capacity structures (including their use as energy storage sources) has increased the need for battery packs with multiple battery cells connected in series and / or parallel and housed within a battery pack casing. This necessitates methods to improve both the structural safety and energy density of battery packs while simultaneously increasing their productivity. Summary of the Invention

[0005] Technical issues

[0006] The technical problem this disclosure seeks to solve is to provide a battery pack with improved productivity, increased energy density, and structural stiffness.

[0007] Technical solution

[0008] To address the aforementioned technical problems, this disclosure provides a battery pack, comprising: a battery pack housing including a lower housing and an upper housing defining an internal space; and a plurality of battery cell units, each comprising a plurality of battery cells and disposed within the internal space, wherein each battery cell unit includes a plurality of battery cells stacked in a first direction and battery cell side beams disposed on both sides of the stacked plurality of battery cells, wherein the lower housing includes: a pair of side frames; a base plate attached to the lower part of each side frame; a front cover forming a front sidewall of the lower housing; a rear cover forming a rear sidewall of the battery pack housing; a middle beam extending in the first direction; and at least one crossbeam extending in a second direction perpendicular to the first direction, wherein each battery cell unit is disposed within a space defined by the crossbeam, the middle beam, the side frames, and the front or rear cover, and the battery cell side beams are attached to the crossbeam.

[0009] In some embodiments, the height of the battery cell side beam can be greater than the height of the cross beam.

[0010] In some embodiments, the battery cell side beam includes a recess, and the crossbeam may be at least partially disposed within the recess.

[0011] In some embodiments, the depth of the recess may be less than or equal to half the thickness of the beam in the first direction.

[0012] In some embodiments, the recess may extend along the second direction over the entire length of the facing beam of the cell side beam.

[0013] In some embodiments, the battery cell side beam may have a convex portion that protrudes in a first direction relative to the recess, the convex portion being configured to engage with the crossbeam via a concave-convex structure.

[0014] In some embodiments, the battery cell side beam may have a protrusion that projects in a first direction relative to the recess, the protrusion being configured to be coupled to the beam by fasteners.

[0015] In some embodiments, at least one crossbeam may be fixed to a pair of side frames by welding.

[0016] In some embodiments, one end of the beam may be welded to one of a pair of side frames, and the other end of the beam may be welded to the other of the pair of side frames.

[0017] In some embodiments, the height of the crossbeam can be 40% to 90% of the height of the side frame.

[0018] In some embodiments, each of the plurality of battery cells in a battery cell unit may be at least partially exposed toward the upper and / or lower housing.

[0019] Another aspect of this disclosure provides a battery pack, comprising: a battery pack housing including a lower housing and an upper housing defining an internal space; and a plurality of battery cell units, each comprising a plurality of battery cells and disposed within the internal space, wherein each battery cell unit includes a plurality of battery cells stacked in a first direction and battery cell side beams disposed on both sides of the stacked plurality of battery cells. The lower housing includes: a pair of side frames; a base plate coupled to the lower portion of each side frame; a front cover forming a front sidewall of the lower housing; a rear cover forming a rear sidewall of the battery pack housing; an intermediate beam extending in the first direction; and at least one crossbeam extending in a second direction perpendicular to the first direction, wherein each of the facing battery cell side beams of two adjacent battery cell units (with the crossbeam therebetween) includes: a protrusion projecting from the upper portion of the crossbeam toward each other; and a recess capable of at least partially receiving the crossbeam.

[0020] In some embodiments, the battery cell side beams located on both sides of the crossbeam can be attached to the crossbeam by bolts inserted upward in a third direction perpendicular to the first and second directions.

[0021] In some embodiments, at least one battery cell side beam disposed on both sides of a battery cell may be attached to a front cover or a rear cover.

[0022] In some embodiments, the interior space is divided into four compartments arranged in a 2×2 configuration by a central beam and a crossbeam, and each compartment may contain a single battery cell.

[0023] Beneficial effects

[0024] The battery pack disclosed herein has the effect of providing a battery pack with greater assembly freedom, which can improve productivity and provide a battery pack with improved energy density and structural stiffness.

[0025] The effects that can be obtained from the exemplary embodiments of this disclosure are not limited to those mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art from the following description, i.e., those skilled in the art can also derive unintended effects from the exemplary embodiments of this disclosure when practicing the exemplary embodiments of this disclosure. Attached Figure Description

[0026] Figure 1 This is a schematic perspective view of a battery pack according to an embodiment of the present disclosure.

[0027] Figure 2 This is an exploded perspective view schematically showing the appearance of a battery pack according to an embodiment of the present disclosure.

[0028] Figure 3 It is a schematic perspective view of a single battery cell housed within a battery pack.

[0029] Figure 4 It shows along Figure 3 A cross-sectional view of the battery cell 110 cut along line A-A'.

[0030] Figure 5 This is a partial cross-sectional view schematically illustrating how two adjacent battery cells according to an embodiment of the present disclosure are joined together by a crossbeam therebetween.

[0031] Figure 6 This is a partial cross-sectional view schematically illustrating how two adjacent battery cells according to another embodiment of the present disclosure are joined together by a crossbeam therebetween.

[0032] Figure 7 This is a schematic diagram showing how a battery cell can be attached to a front or rear cover.

[0033] Figure 8 It is along Figure 2A schematic diagram of the cross-section of the beam. Detailed Implementation

[0034] In the following, preferred embodiments of the concepts of this disclosure will be described in detail with reference to the accompanying drawings. However, embodiments of this disclosure may be modified in many other ways and should not be construed as limiting the scope of this disclosure to the embodiments described below. Preferably, embodiments of the concepts of this disclosure are intended to provide a more comprehensive illustration of the concepts of this disclosure to those skilled in the art. The same reference numerals generally refer to the same elements. Furthermore, various elements and regions in the drawings are depicted schematically. Therefore, the concepts of this disclosure are not limited to the relative dimensions or relative spacing depicted in the drawings.

[0035] Terms such as "first" and "second" can be used to describe various components, but these components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another. For example, a first component can be referred to as a second component, and vice versa, without departing from the scope of the concepts of this disclosure.

[0036] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the concepts of this disclosure. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this disclosure, expressions such as “comprising” or “having” are intended to indicate the presence of the described features, quantities, steps, operations, components, parts, or combinations thereof, and should not be construed as excluding the possibility of the presence or addition of one or more other features, quantities, operations, components, parts, or combinations thereof.

[0037] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which the concepts of this disclosure pertain. It should also be understood that such terms, as commonly used and defined in dictionaries, shall be interpreted as having a meaning consistent with their meaning in the context of the field to which they pertain, and shall not be interpreted as having an overly formal meaning unless expressly defined herein.

[0038] When embodiments can be exemplified differently, a particular step may be performed in an order other than that described. For example, two consecutively described steps may be performed substantially simultaneously, or in the reverse order of their description.

[0039] In the accompanying drawings, variations in the depicted geometry may be expected, for example, due to manufacturing techniques and / or manufacturing tolerances. Therefore, embodiments of this disclosure should not be construed as limited to specific geometries within the areas shown herein, and should include variations in geometry, for example, resulting from manufacturing processes. All terms “and / or” as used herein include each combination of one or more components mentioned and each combination thereof. Furthermore, as used herein, the term “substrate” may refer to the substrate itself, or to a laminate comprising the substrate and any predetermined layer or film formed on its surface. Additionally, as used herein, the term “surface of substrate” may refer to the exposed surface of the substrate itself, or to the outer surface of a predetermined layer or film formed on the substrate.

[0040] (First embodiment)

[0041] Figure 1 This is a perspective view schematically showing the appearance of a battery pack 100 according to an embodiment of the present disclosure. Figure 2 This is an exploded perspective view schematically illustrating a battery pack 100 according to an embodiment of the present disclosure. Figure 3 This is a perspective view schematically showing the individual battery cells 110 housed within the battery pack 100.

[0042] exist Figures 1 to 3 In the diagram, the battery pack 100 is shown as being defined in a vertical coordinate system defined by a first direction perpendicular to each other along the x-axis, a second direction perpendicular to the y-axis, and a third direction perpendicular to the z-axis, but the first direction, the second direction, and the third direction only need to be perpendicular to each other and are not particularly restricted.

[0043] Reference Figures 1 to 3 According to one embodiment of the present disclosure, a battery pack 100 may include at least one battery cell 110 and a battery pack housing 120 having an internal space formed to accommodate at least one battery cell 110.

[0044] In some embodiments, the battery cell unit 110 may include a battery module, wherein the battery cell is housed within a module frame and the battery module may be housed within an internal space. Although the battery cell 111 is described herein as being housed directly within the internal space of the battery pack housing 120 without being housed within a module frame, those skilled in the art will understand that this may also apply when the battery cell is configured as a battery module.

[0045] For example, battery cell 111 can be a pouch cell with high energy density and easy stacking, or it can be a prismatic or cylindrical battery cell. Although battery cell 111 is described herein with respect to pouch cell, those skilled in the art will understand that it can also be applied to prismatic or cylindrical battery cells.

[0046] Multiple battery cells 111 can be electrically connected to each other via busbars disposed within the busbar frame 112 and can be housed within the battery pack housing 120, and can be fixed to the bottom surface of the battery pack housing 120, for example, via a heat-dissipating resin layer.

[0047] The battery pack housing 120, which serves as a component for forming the space of the battery cell 110, may include a pair of side frames 121, 122; a bottom plate 126 attached to the lower part of each of the pair of side frames 121, 122 and a top plate 125 attached to the upper part of each of the side frames 121, 122; a front cover 124 forming the front wall of the battery pack housing 120 and a rear cover 123 forming the rear wall of the battery pack housing 120.

[0048] In some embodiments, the top plate 125 may form an upper housing, and the bottom plate 126; side frames 121, 122; front cover and rear cover 123 may form a lower housing.

[0049] For example, such as Figure 2 As shown, the battery pack housing 120 may include a first side frame 121 located on the left side relative to the base plate 126 and a second side frame 122 located on the right side. That is, the first side frame 121 can be attached to the left end of the base plate 126, and the second side frame 122 can be attached to the right end of the base plate 126.

[0050] In some embodiments, the battery pack housing 120 may further include a venting unit 130. In some embodiments, the venting unit 130 of the battery pack 100 may be disposed inside the internal space of the battery pack housing 120. The venting unit 130 may have a plate-like shape overall. The venting unit 130 may be configured to at least partially rupture when the internal gas pressure of the battery pack housing 120 is higher than a predetermined level.

[0051] The exhaust unit 130 can be configured such that when a portion of the exhaust unit 130 ruptures as described above, gas in the internal space flows into the air inlet. In other words, when a portion of the exhaust unit 130 ruptures, the gas pressure inside the battery pack housing 120 is greater than the atmospheric pressure outside the battery pack housing, causing the gas in the internal space of the battery pack housing 120 to travel along the gas discharge flow path, and the gas can be discharged to the outside through the gas discharge holes at the ends of the gas discharge flow path via the exhaust devices 150 of the rear cover 123 and the front cover 124.

[0052] For this purpose, the rear cover 123 and the front cover 124 may have flow paths through which gas can flow, similar to the first side frame 121 and the second side frame 122. The flow paths of the rear cover 123 and the front cover 124 may be in fluid communication with gas discharge flow paths and gas discharge holes formed inside the side frames 121, 122.

[0053] The flow paths of the rear cover 123 and the front cover 124 are in fluid communication with the exhaust device 150, so that gas can be discharged through the exhaust device 150.

[0054] The battery cell unit 110 may include a plurality of battery cells 111 stacked in a first direction (e.g., in the x-axis direction), and battery cell side beams 113 may be disposed on both sides of the plurality of battery cells 111 in the first direction. As previously described, the plurality of battery cells 111 may be electrically connected to each other via busbars disposed within the busbar frame 112.

[0055] Figure 4 It shows along Figure 3 A cross-sectional view of the battery cell 110 cut along line A-A'.

[0056] Reference Figure 3 and Figure 4 The battery cell side beam 113 is disposed on both sides of a plurality of battery cells 111 stacked along a first direction (e.g., along the x-axis direction).

[0057] In some embodiments, the battery cell 111 may have a thin plate-like body, preferably a pouch cell structure. A pouch cell may include a structure in which a positive electrode, a separator, and a negative electrode are alternately stacked to form an electrode assembly, and electrode tabs protrude from at least one side and are connected to battery cell leads. The positive and negative electrodes can be prepared by coating at least one side of the current collector with a slurry containing, for example, electrode active materials, binder resins, conductive materials, and other additives. For the positive electrode, conventional positive electrode active materials, such as lithium-containing transition metal oxides, can be used; for the negative electrode, conventional negative electrode active materials from which lithium ions can be absorbed and released, such as lithium metal, carbon materials, and metal compounds or mixtures thereof, can be used. Furthermore, conventional porous polymer membranes used in lithium secondary batteries can be used as separators.

[0058] The electrolyte housed in the cover along with the electrode assembly can be a conventional lithium secondary battery electrolyte. The cover is formed of a sheet and has compartments for housing the electrode assembly. Preferably, the cover is formed by combining a first housing and a second housing, which are formed by processing the sheet into a predetermined shape. The sheet including the cover has a multilayer structure, comprising an outermost resin layer made of an insulating material such as polyethylene terephthalate (PET) or nylon, a metal layer made of aluminum to maintain mechanical strength and prevent the penetration of moisture and oxygen, and an inner resin layer made of a polyolefin-based material that has thermal adhesive properties and serves as a sealing material.

[0059] Depending on the requirements, the sheet forming the cover may have predetermined adhesive resin layers inserted between the inner resin layer and the metal layer, and between the outer resin layer and the metal layer. The adhesive resin layers are used for smooth attachment between different materials and are formed as a single layer or multiple layers. The material is typically a polyolefin-based resin, or, for ease of processing, a polyurethane resin, or a mixture thereof, may be used.

[0060] In some embodiments, the battery cell side beam 113 can be supported by fixing the battery cell side beam 113 to the busbar frame 112.

[0061] Each battery cell 110 includes a plurality of battery cells 111 that may be at least partially exposed toward the top plate 125 and / or bottom plate 126 of the battery pack housing 120. In some embodiments, battery cell side beams 113 may extend along the upper or lower surfaces of the plurality of battery cells 111 to serve as a module frame. In some embodiments, the battery cell side beams 113 may not always completely surround the plurality of battery cells 111 while serving as a module frame. In this case, the plurality of battery cells 111 may be at least partially exposed toward the top plate 125 and / or bottom plate 126 of the battery pack housing 120.

[0062] In some embodiments, the battery cell side beam 113 may not extend along the upper surface of the plurality of battery cells 111. In some embodiments, the battery cell side beam 113 may not extend along the lower surface of the plurality of battery cells 111. In some embodiments, the battery cell side beam 113 may not extend along both the upper and lower surfaces of the plurality of battery cells 111.

[0063] In some embodiments, the battery cell side beam 113 may include a recess 1133 that at least partially accommodates the crossbeam 128, as described below. In some embodiments, the battery cell side beam 113 may have a protrusion 1131 that projects in a first direction relative to the recess 1133.

[0064] The recess 1133 may have a first height H1 in a third direction (e.g., in the z-axis direction). The first height H1 may be substantially the same as the height of the crossbeam 128, which will be described later. Therefore, the height of the cell side beam 113 in the third direction is greater than that of the crossbeam 128.

[0065] The recess 1133 may extend along the length of the battery cell side beam 113 (e.g., along the y-axis).

[0066] Figure 5 This is a partial cross-sectional view schematically illustrating how two adjacent battery cell units 110a, 110b are joined together by a crossbeam 128 between them, according to one embodiment of the present disclosure.

[0067] Reference Figure 4 and Figure 5 The first battery cell unit 110a and the second battery cell unit 110b are adjacent to each other and have a crossbeam 128 between them. The first battery cell side beam 113a of the first battery cell unit 110a faces the second battery cell side beam 113b of the second battery cell unit 110b, and there is a crossbeam 128 between them. The first battery cell side beam 113a and the second battery cell side beam 113b have cross sections that are symmetrical to each other in a first direction (e.g., in the x-axis direction).

[0068] The first battery cell side beam 113a has a first recess 1133a, and the second battery cell side beam 113b has a second recess 1133b. The crossbeam 128 can be disposed within the space defined by the first recess 1133a and the second recess 1133b.

[0069] exist Figure 5 In the diagram, the protrusions of the first battery cell side beam 113a and the second battery cell side beam 113b are shown in contact with each other, but this disclosure is not limited thereto. In some embodiments, the depth d1 of the recess 1133 (see...) Figure 4 The thickness of the crossbeam 128 in the first direction (e.g., the x-axis direction) can be less than or equal to half of the thickness of the crossbeam 128 in the first direction. In this case, the protrusions of the first battery cell side beam 113a and the second battery cell side beam 113b may not contact each other.

[0070] The side of the crossbeam 128 can contact the side of the forming recesses 1133a and 1133b of the first battery cell side beam 113a and the second battery cell side beam 113b.

[0071] The first battery cell side beam 113a and the second battery cell side beam 113b can be connected to the crossbeam 128 by fasteners such as bolts. For this purpose, a through hole 1135 can be formed in each of the first battery cell side beam 113a and the second battery cell side beam 113b. The through hole 1135 can be formed in the respective protrusions of the first battery cell side beam 113a and the second battery cell side beam 113b. The through hole 1135 can extend in a third direction (e.g., in the z-axis direction). The crossbeam 128 can be provided with a fastening hole into which a fastener inserted through the through hole 1135 can be engaged. A bolt B can pass through the through hole 1135 and extend into the fastening hole provided in the crossbeam 128.

[0072] The recesses 1133a and 1133b can extend along the length direction of the battery cell side beams 113a and 113b facing the crossbeam 128. In other words, the recesses 1133a and 1133b can extend along a second direction along the entire length of the battery cell side beams 113a and 113b (e.g., along the y-axis direction).

[0073] The protruding lower surface 1131u, which forms a step between the protrusion 1131 and the recess 1133, can be in close contact with the upper surface of the crossbeam 128.

[0074] exist Figure 5 In the diagram, the crossbeam 128 and the battery cell side beams 113a, 113b are shown joined by fasteners such as bolts B, but this disclosure is not limited thereto. Figure 6 This is a partial cross-sectional view schematically illustrating how two adjacent battery cell units 110a, 110b can be joined together by a crossbeam 128 between them, according to another embodiment of this disclosure.

[0075] Reference Figure 6 The crossbeam 128a may have a concave-convex structure 128p that can be combined with the battery cell side beams 113a and 113b. In addition, the battery cell side beams 113a and 113b may have complementary concave-convex structures that can mesh and combine with the concave-convex structure 128p of the crossbeam 128a.

[0076] In some embodiments, such as Figure 6 As shown, the crossbeam 128a may have a protrusion projecting toward the lower surface of the protrusion of the battery cell side beams 113a and 113b, and the battery cell side beams 113a and 113b may have a recess to accommodate the protrusion. Those skilled in the art will understand that engagement and connection can be achieved by having a protrusion projecting toward the crossbeam 128a from the lower surface of the protrusion of the battery cell side beams 113a and 113b, and a recess on the upper surface of the crossbeam 128a to accommodate the protrusion.

[0077] Since the battery cell side beam 113 is directly connected to the crossbeam 128, structural rigidity can be increased. Furthermore, because the cross-sectional shape of the battery cell side beam 113 does not restrict the assembly sequence, high productivity can be achieved.

[0078] (Second Embodiment)

[0079] Refer again Figure 2 The battery pack housing 120 of the battery pack 100 may have a central beam 127 and a crossbeam 128. The internal space may be divided by the central beam 127 and the crossbeam 128 into four compartments arranged in a 2×2 configuration. Furthermore, each of the four compartments may accommodate one battery cell 110.

[0080] Since only one crossbeam 128 is provided in this embodiment, the efficiency of the internal space can be improved, thereby increasing the energy density of the battery pack 100.

[0081] The battery cell 110 is attached to the crossbeam 128 in the manner previously referred to Figure 5 and Figure 6 The battery cell 110 faces the front cover 124 or the rear cover 123 on the side that does not face the crossbeam 128.

[0082] Figure 7 This is a schematic diagram showing how a battery cell 110 facing the front cover 124 or the rear cover 123 can be attached to the front cover 124 or the rear cover 123.

[0083] Reference Figure 7 The front cover 124 or the rear cover 123 may have a protrusion corresponding to the recess 1133 of the battery cell side beam 113. In some embodiments, the battery cell side beam 113 may be fastened to the front cover 124 or the rear cover 123 by means of fasteners such as bolts B. For this purpose, the battery cell side beam 113 may be formed as follows: Figure 4 The through hole is shown, and the front cover 124 or the rear cover 123 may be provided with a fastening hole at the position corresponding to the through hole.

[0084] Bolt B can be used to attach the battery cell side beam 113 and the front cover 124 or rear cover 123 to each other through a through hole extending into a fastening hole in the front cover 124 or rear cover 123.

[0085] Although Figure 7 An example is shown of using fasteners such as bolts B to attach the battery cell side beam 113 to the front cover 124 or the rear cover 123; however, those skilled in the art will understand that the battery cell side beam 113 and the front cover 124 or the rear cover 123 can be attached to each other by means of an interlocking engagement using a tongue-and-groove structure, as shown in the reference. Figure 6 The described embodiments.

[0086] In some embodiments, the battery pack housing 120 may further include an additional crossbeam adjacent to the front cover 124 or the rear cover 123. In this case, the battery cell side beams 113 may be integrated into the additional crossbeam. In this case, structural strain on the front cover 124 or the rear cover 123 can be mitigated because the mechanical loads generated by the battery cell 110 are transferred to the additional crossbeam.

[0087] Figure 8 It is schematically shown along Figure 2 A sectional view of the crossbeam cut open at 128.

[0088] Reference Figure 8The crossbeam 128 can be welded to a pair of side frames 121, 122. That is, one end of the crossbeam 128 can be welded to one of the pair of side frames 121, 122, and the other end of the crossbeam 128 can be welded to the other of the pair of side frames 121, 122.

[0089] Since the crossbeam 128 was previously bolted to the side frames 121 and 122, through holes for bolting are provided on the side of the side frames at positions corresponding to the crossbeam 128.

[0090] Since the crossbeam 128 is welded to the side frames 121 and 122, there are no through holes in the sides of the side frames 121 and 122, thus preventing foreign matter such as moisture from penetrating through the through holes.

[0091] In some embodiments, the crossbeam 128 may have a notch N for engaging with the intermediate beam 127. The intermediate beam 127 may extend through in the line of sight. Figure 8 The notch N is shown. The crossbeam 128 and the intermediate beam 127 can be joined to each other in a third direction (e.g., in the z-axis direction) at the part where they intersect.

[0092] The height of the crossbeam 128 in a third direction (e.g., in the z-axis direction) can be approximately 40% to approximately 90% of the height of the side frames 121, 122. If the height of the crossbeam 128 is too low, it may not provide sufficient support for the battery cell unit 110. If the height of the crossbeam 128 is too high, it may make it difficult to secure the battery cell side beam 113 to the crossbeam 128.

[0093] In some embodiments, the height of the crossbeam 128 in a third direction (e.g., in the z-axis direction) may be within the range of about 40% to about 90%, about 45% to about 85%, about 50% to about 80%, about 55% to about 75%, about 60% to about 70%, or any two of the heights of the side frames 121, 122.

[0094] Although embodiments of the present disclosure have been described in detail above, those skilled in the art will be able to make various modifications to the present disclosure without departing from the spirit and scope of the disclosure as defined in the appended claims. Therefore, future modifications to the embodiments will not depart from the technology of the present disclosure.

[0095] Explanation of reference numerals in the attached figures

[0096] 100: Battery pack

[0097] 110, 110a, 110b: Battery cell

[0098] 111: Battery cell

[0099] 112: Busbar Frame

[0100] 113, 113a, 113b: Side beams of individual battery cells

[0101] 120: Battery pack casing

[0102] 121, 122: Side frames

[0103] 123: Back cover

[0104] 124: Front Cover

[0105] 125: Top plate

[0106] 126: Base Plate

[0107] 127: Intermediate beam

[0108] 128, 128a: Crossbeam

[0109] 1131: convex part

[0110] 1133, 1133a, 1133b: concave portion

[0111] 1135: Through hole

Claims

1. A battery pack, comprising: The battery pack housing includes a lower housing and an upper housing that define the internal space; as well as Multiple battery cell units, including multiple battery cells, are disposed within the internal space. Each of the battery cells includes multiple battery cells stacked in a first direction and battery cell side beams disposed on both sides of the stacked multiple battery cells. The lower housing includes: A pair of side frames; The base plate is attached to the lower part of each of the side frames; The front cover forms the front sidewall of the lower housing; The rear cover forms the rear sidewall of the battery pack housing; The intermediate beam extends in the first direction; and At least one crossbeam extends in a second direction perpendicular to the first direction. Each of the battery cells is disposed within a space defined by the crossbeam, the intermediate beam, the side frame, and the front cover or the rear cover. The battery cell side beam is attached to the crossbeam.

2. The battery pack according to claim 1, wherein, The height of the side beam of the battery cell is greater than the height of the crossbeam.

3. The battery pack according to claim 1, in, The battery cell side beam includes a recess, and The crossbeam is at least partially housed within the recess.

4. The battery pack according to claim 3, wherein, The depth of the recess is less than or equal to half the thickness of the crossbeam in the first direction.

5. The battery pack according to claim 3, wherein, The recess extends along the second direction over the entire length of the side beam of the battery cell facing the crossbeam.

6. The battery pack according to claim 3, wherein, The battery cell side beam has a protrusion that protrudes in the first direction relative to the recess, the protrusion being configured to engage with the crossbeam via a concave-convex structure.

7. The battery pack according to claim 3, wherein, The battery cell side beam has a protrusion that protrudes in the first direction relative to the recess, the protrusion being configured to be engaged with the crossbeam by fasteners.

8. The battery pack according to claim 1, wherein, The at least one crossbeam is fixed to the pair of side frames by welding.

9. The battery pack according to claim 8, wherein, One end of the crossbeam is welded to one of the pair of side frames, and the other end of the crossbeam is welded to the other of the pair of side frames.

10. The battery pack according to claim 8, wherein, The height of the crossbeam is 40% to 90% of the height of the side frame.

11. The battery pack according to claim 1, wherein, Each of the plurality of battery cells in the battery cell unit is at least partially exposed toward the upper housing and / or the lower housing.

12. A battery pack, comprising: The battery pack housing includes a lower housing and an upper housing that define the internal space; as well as Multiple battery cell units, including multiple battery cells, are disposed within the internal space. Each of the battery cells includes multiple battery cells stacked in a first direction and battery cell side beams disposed on both sides of the stacked multiple battery cells. The lower housing includes: A pair of side frames; The base plate is attached to the lower part of each of the side frames; The front cover forms the front sidewall of the lower housing; The rear cover forms the rear sidewall of the battery pack housing; An intermediate beam extends in the first direction; and At least one crossbeam extends in a second direction perpendicular to the first direction. The crossbeam is located between two adjacent battery cells, and each of the facing side beams of the two adjacent battery cells includes: The protrusions extend from the upper part of the crossbeams toward each other; and The recess is capable of at least partially accommodating the crossbeam.

13. The battery pack according to claim 12, in, The battery cell side beams located on both sides of the crossbeam are attached to the crossbeam by bolts inserted upwards in a third direction perpendicular to the first and second directions.

14. The battery pack according to claim 12, wherein, At least one of the battery cell side beams disposed on both sides of the battery cell unit is attached to the front cover or the rear cover.

15. The battery pack according to claim 12, wherein, The interior space is divided into four compartments arranged in a 2×2 configuration by a central beam and a crossbeam, and One battery cell is located in one compartment.

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