The battery pack and the vehicle include this battery pack.

Abstract

According to one designation of the invention, the battery assembly may comprise multiple battery cells, a busbar assembly arranged on one side of the multiple battery cells and comprising a sub-busbar unit connected to the positive and negative electrodes of the multiple battery cells, and a side frame configured to support the multiple battery cells at the bottom of the busbar assembly and comprising a metal part connected to the sub-busbar unit.

Description

Battery pack and vehicle including same

[0001] The present invention relates to a battery pack and a vehicle including the same, and more particularly, to a battery pack having improved stability of electrical connection and a vehicle including the same.

[0002] This application claims priority to Korean Patent Application No. 10-2024-0019095, filed on February 7, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[0003] Secondary batteries, which boast high electrical properties such as high energy density and easy applicability across a wide range of product categories, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) powered by electrical power sources. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can dramatically reduce fossil fuel use, but also because they produce no byproducts from energy use.

[0004] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, i.e., unit battery cells, is approximately 2.5 V to 4.5 V. Therefore, when a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Furthermore, depending on the charge / discharge capacity required for the battery pack, a number of battery cells are connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack can be set in various ways depending on the required output voltage or charge / discharge capacity.

[0005] Recently, medium and large battery packs applied to electric vehicles, etc. are configured to include a large number of battery cells with higher cell capacities to increase output and / or capacity, and these battery cells are electrically connected through bus bars.

[0006] For these mid- to large-sized battery packs, the safety of the busbar electrical connection structure is relatively more critical. If large busbars are used to ensure electrical connection stability, the space occupied by these large busbars increases the overall battery pack size, hindering slimming and lowering the pack's energy density.

[0007] Therefore, in large-capacity battery packs such as mid- to large-sized battery packs, there is a need to find a way to maximize energy density while ensuring the stability of the electrical connection structure.

[0008] Accordingly, an object of the present invention is to provide a battery pack capable of maximizing energy density while ensuring the stability of an electrical connection structure, and an automobile including the same.

[0009] In addition, another object of the present invention is to provide a battery pack and a vehicle including the same that can further increase structural rigidity.

[0010] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0011] In order to solve the above object, the present invention provides a battery pack, characterized by including: a plurality of battery cells; a busbar assembly including a sub-busbar unit disposed on one side of the plurality of battery cells and connected to electrodes of the plurality of battery cells; and a side frame having a metal member that supports the plurality of battery cells at a bottom of the busbar assembly and is connected to the sub-busbar unit.

[0012] In addition, preferably, the sub-busbar unit includes a bidirectional connection busbar connected to the electrodes of the battery cells on both sides in the width direction of the sub-busbar unit; and a unidirectional connection busbar connected to the electrodes of the battery cells on one side in the width direction of the sub-busbar unit, and the metal member can be connected to the unidirectional connection busbar.

[0013] Additionally, preferably, a portion of the metal member may be in contact with the one-way connection bus bar on the upper side of the side frame, and the remaining portion of the metal member may be inserted into the side frame.

[0014] In addition, preferably, the metal member is inserted into the side frame, and one end thereof is bent so as to be connected to the one-way connection bus bar at the upper portion of the side frame.

[0015] In addition, preferably, the metal member may include an insertion portion inserted into the side frame; and a busbar connection portion bent from the insertion portion and connected to the one-way connection busbar outside the side frame.

[0016] In addition, preferably, the busbar connecting portion may include a connecting body formed to a predetermined length along the longitudinal direction of the one-way connecting busbar; and a protrusion protruding from the connecting body to the one-way connecting busbar to a predetermined length and in contact with the one-way connecting busbar.

[0017] Additionally, preferably, the protrusion can be welded to the one-way connection bus bar.

[0018] Additionally, preferably, the protrusion may be provided in a trapezoidal shape.

[0019] In addition, preferably, the protrusions are provided in a plurality, and the plurality of protrusions can be arranged at a predetermined distance from each other along the longitudinal direction of the connecting body.

[0020] Additionally, preferably, the plurality of protrusions may be arranged between the plurality of battery cells in the longitudinal direction of the connecting body.

[0021] In addition, preferably, the one-way connection busbar is provided on both outermost sides of the sub-busbar unit, and the metal member may be provided on both outermost sides of the side frame.

[0022] In addition, preferably, the side frame includes a plurality of side structures supporting the plurality of battery cells; and a pair of side walls provided on the outermost sides of the plurality of side structures, and the metal member may be provided on the pair of side walls.

[0023] Additionally, preferably, the metal member can be mounted to the side frame through an insert injection process.

[0024] Additionally, preferably, the metal member may be made of aluminum.

[0025] Additionally, preferably, the thickness of the metal member may be at least 2 mm.

[0026] And, the present invention provides a vehicle, characterized in that it includes at least one battery pack according to the above-described embodiments.

[0027] According to various embodiments as described above, a battery pack capable of maximizing energy density while ensuring the stability of an electrical connection structure and a vehicle including the same can be provided.

[0028] In addition, according to various embodiments as described above, a battery pack and a vehicle including the same can be provided that can further increase structural rigidity.

[0029] In addition, various additional effects can be achieved through various embodiments of the present invention. These various effects of the present invention will be described in detail in each embodiment, or descriptions of effects easily understandable to those skilled in the art will be omitted.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0031] FIG. 1 is a drawing for explaining a battery pack according to one embodiment of the present invention.

[0032] FIG. 2 is a schematic plan view of a battery pack according to one embodiment of the present invention.

[0033] Figure 3 is a schematic enlarged view of part A of the battery pack of Figure 2.

[0034] Figure 4 is a schematic cross-sectional view of part A of the battery pack of Figure 2.

[0035] Figure 5 is a schematic enlarged view of the main part of the battery pack of Figure 4.

[0036] FIG. 6 is a partially exploded perspective view of a battery pack according to one embodiment of the present invention.

[0037] Figure 7 is an exploded perspective view of the busbar assembly of the battery pack of Figure 6.

[0038] Fig. 8 is a drawing for explaining a bidirectional connection busbar of a sub-busbar unit of the busbar assembly of Fig. 7.

[0039] Fig. 9 is a drawing for explaining a one-way connection busbar of a sub-busbar unit of the busbar assembly of Fig. 7.

[0040] Figure 10 is an exploded perspective view of the side wall of the side frame of the battery pack of Figure 6.

[0041] Fig. 11 is a drawing for explaining a metal member provided on the side wall of Fig. 10.

[0042] Fig. 12 is a schematic plan view of the side wall of Fig. 10 excluding the metal parts.

[0043] Figure 13 is a schematic cross-sectional view including a metal member in the side wall of Figure 10.

[0044] Fig. 14 is a schematic enlarged view of a main portion of a side wall including the metal member of Fig. 13.

[0045] FIG. 15 is a drawing for explaining the connection of a busbar assembly and a metal member of a battery pack according to one embodiment of the present invention.

[0046] FIG. 16 is a drawing for explaining a battery pack according to another embodiment of the present invention.

[0047] Fig. 17 is a drawing for explaining a metal member provided on the side wall of the side frame of the battery pack of Fig. 16.

[0048] FIG. 18 is a drawing for explaining a battery pack according to another embodiment of the present invention.

[0049] Fig. 19 is an exploded perspective view of the side wall of the side frame provided in the battery pack of Fig. 18.

[0050] Fig. 20 is a perspective view of a metal member provided on the side wall of Fig. 19.

[0051] Fig. 21 is a side view of the metal member of Fig. 20.

[0052] Fig. 22 is a cross-sectional view including a metal member in the side wall of Fig. 19.

[0053] Figure 23 is a schematic enlarged view of the main part of the side wall including the metal member of Figure 22.

[0054] FIG. 24 is a drawing for explaining a battery pack according to another embodiment of the present invention.

[0055] Fig. 25 is a drawing for explaining a one-way connection busbar of a sub-busbar unit of a busbar assembly of a battery pack of Fig. 24.

[0056] FIG. 26 is a drawing for explaining a one-way connection busbar according to another embodiment of a sub-busbar unit of the busbar assembly of the battery pack of FIG. 24.

[0057] Fig. 27 is a drawing for explaining the connection of a one-way connection bus bar and a metal member of the bus bar assembly of the battery pack of Fig. 24.

[0058] Fig. 28 is a drawing for explaining a vehicle according to one embodiment of the present invention.

[0059] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0060] Accordingly, 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, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0061] Meanwhile, in this specification, terms indicating directions such as up, down, left, right, front, and back may be used, but these terms are only for convenience of explanation, and it is obvious to those skilled in the art that these terms may vary depending on the location of the target object or the location of the observer.

[0062]

[0063] FIG. 1 is a drawing for explaining a battery pack according to one embodiment of the present invention, FIG. 2 is a schematic plan view of a battery pack according to one embodiment of the present invention, FIG. 3 is a schematic enlarged view of part A of the battery pack of FIG. 2, FIG. 4 is a schematic cross-sectional view of part A of the battery pack of FIG. 2, and FIG. 5 is a schematic enlarged view of a main part of the battery pack of FIG. 4. Meanwhile, in FIGS. 3 to 5, the configuration of a busbar cover (250, 260) of a busbar assembly (200) described later is omitted for convenience of explanation.

[0064] Referring to FIGS. 1 to 5, a battery pack (10) may include a plurality of battery cells (100), a busbar assembly (200), and a side frame (300).

[0065] The plurality of battery cells (100) may be provided as secondary batteries, and may be provided as cylindrical secondary batteries, pouch-shaped secondary batteries, or square secondary batteries. Hereinafter, in the present embodiment, the plurality of battery cells (100) will be described as being provided as cylindrical secondary batteries. The plurality of battery cells (100) may be provided as a large number of battery cells having a higher cell capacity to increase output and / or capacity for the configuration of a medium- to large-sized battery pack (10).

[0066] The above busbar assembly (200) is for electrical connection of the plurality of battery cells (100) and can be arranged on one side of the plurality of battery cells (100). Specifically, the busbar assembly (200) is arranged on the upper side (+Z-axis direction) of the plurality of battery cells (100) and can be electrically connected to the plurality of battery cells (100) in one direction.

[0067] The above busbar assembly (200) may include a sub-busbar unit (210) connected to the electrodes (110, 130) of the plurality of battery cells (100) for the electrical connection.

[0068] The side frame (300) can support the plurality of battery cells (100) at the bottom (-Z-axis direction) of the busbar assembly (200). In addition to the plurality of battery cells (100), the side frame (300) can also support other components that constitute the busbar assembly (200) and the battery pack (10).

[0069] The above side frame (300) may include a metal member (400) connected to the sub-bus bar unit (210). The metal member (400) may have a predetermined length and area.

[0070] According to this embodiment, when electrically connecting the sub-busbar unit (210) through the metal member (400) connected to the sub-busbar unit (210), an additional cross-sectional area equivalent to that of the metal member (400) can be secured.

[0071] Therefore, according to the present embodiment, the stability of the electrical connection can be further secured when electrically connecting the sub-bus bar unit (210) and the electrodes (110, 130) of the battery cells (100).

[0072] In addition, according to the present embodiment, since the metal member (400) is additionally provided to the side frame (300), the rigidity of the side frame (300) can be increased through the metal member (400).

[0073]

[0074] FIG. 6 is a partially exploded perspective view of a battery pack according to one embodiment of the present invention, FIG. 7 is an exploded perspective view of a busbar assembly of the battery pack of FIG. 6, FIG. 8 is a drawing for explaining a two-way connection busbar of a sub-busbar unit of the busbar assembly of FIG. 7, and FIG. 9 is a drawing for explaining a one-way connection busbar of a sub-busbar unit of the busbar assembly of FIG. 7.

[0075] Referring to FIGS. 6 to 9 and the preceding drawings, the plurality of battery cells (100) may each include a positive electrode (110) and a negative electrode (130) as electrodes (110, 130). An insulating gasket (150) for electrical insulation may be provided between the positive electrode (110) and the negative electrode (130).

[0076] The above sub-busbar unit (210) may include a two-way connection busbar (220) and a one-way connection busbar (230).

[0077] The above two-way connection bus bar (220) can be connected to the electrodes (110, 130) of the battery cells (100) on both sides (+Y-axis direction and -Y-axis direction) of the sub-bus bar unit (210) in the width direction, respectively.

[0078] The above one-way connection bus bar (230) can be connected to the electrodes (110, 130) of the battery cells (100) on one side (+Y-axis direction or -Y-axis direction) of the width direction of the sub-bus bar unit.

[0079] The metal member (400) may be connected to the one-way connection bus bar (230). When electrically connecting the sub-bus bar unit (210) and the electrodes (110, 130) of the battery cells (100), in the case of the one-way connection bus bar (230) connected to the electrodes (110, 130) of the battery cells (100) at one side (+Y-axis direction or -Y-axis direction) of the width direction of the sub-bus bar unit (210), the possibility of the bus bar fusing due to high current may be relatively greater compared to the two-way connection bus bar (230). In the present embodiment, since the metal member (400) is connected to the one-way connection bus bar (230), the cross-sectional area of ​​the one-way connection bus bar (230) is additionally secured, so that the risk of fusing that may occur in the one-way connection bus bar (230) can be effectively prevented.

[0080]

[0081] FIG. 10 is an exploded perspective view of a side wall of a side frame of a battery pack of FIG. 6, FIG. 11 is a drawing for explaining a metal member provided in the side wall of FIG. 10, FIG. 12 is a schematic plan view of the side wall of FIG. 10 excluding the metal member, FIG. 13 is a schematic cross-sectional view including the metal member in the side wall of FIG. 10, FIG. 14 is a schematic enlarged view of a main part of the side wall including the metal member of FIG. 13, and FIG. 15 is a drawing for explaining a connection between a busbar assembly and a metal member of a battery pack according to one embodiment of the present invention.

[0082] Referring to FIGS. 10 to 15 and the preceding drawings, a portion of the metal member (400) may be in contact with the one-way connection bus bar (230) on the upper side (+Z-axis direction) of the side frame (300), and the remaining portion of the metal member (400) may be inserted into the side frame (300). Accordingly, the metal member (400) may be more stably fixed to the side frame (300) and may be in contact with and connected to the one-way connection bus bar (230) of the sub-bus bar unit (210) of the bus bar assembly (200).

[0083] The metal member (400) is inserted into the side frame (300), and one end thereof is bent so as to be connected to the one-way connection bus bar (230) at the upper portion of the side frame (300). Specifically, the metal member (400) can be mounted in the side frame (300) as an integrally bent structure. In this way, in the present embodiment, a connection structure with the one-way connection bus bar (230) can be implemented through an insertion structure of the metal member (400) provided as a single member into the side frame (300), thereby securing the cross-sectional area of ​​the one-way connection bus bar (230) with a simple structure. In addition, in the present embodiment, the rigidity of the side frame (300) can also be reinforced with a simpler structure through the metal member (400) inserted and mounted in the side frame (300).

[0084] The above metal member (400) may be provided in multiple pieces. The multiple metal members (400) may be provided in a number corresponding to the number of the one-way connection bus bars (230) of the sub bus bar unit (210). Therefore, in the present embodiment, the cross-sectional area of ​​all the one-way connection bus bars (230) can be secured, thereby realizing more uniform electrical stability of the sub bus bar unit (210). In addition, in the present embodiment, since a plurality of metal members (400) are inserted into the side frame (300), the rigidity of the side frame (300) can be further increased.

[0085] The above metal member (400) may include an insertion portion (410) and a bus bar connection portion (430).

[0086] The above insertion portion (410) can be inserted into the side frame (300). The above insertion portion (410) can be provided in a plate shape with a roughly square shape so as to secure a predetermined cross-sectional area.

[0087] The above bus bar connecting portion (430) can be bent from the insertion portion (410) and connected to the one-way connection bus bar (230) outside the side frame (300). The bus bar connecting portion (430) can be connected to the one-way connection bus bar (230) by making contact while supporting the bottom of the one-way connection bus bar (230) from the upper side (+Z-axis direction) of the side frame (300).

[0088] The above bus bar connecting portion (430) may include a connecting body (432) and a protrusion (435).

[0089] The above connecting body (432) may be formed to a predetermined length along the longitudinal direction (X-axis direction) of the one-way connecting bus bar (230). The connecting body (432) may be mounted on the upper surface of the side frame (300). The connecting body (432) may be integrally bent from the insertion portion (410) and may be in at least partial contact with the one-way connecting bus bar (230).

[0090] The protrusion (435) may protrude from the connecting body (432) toward the one-way connection bus bar (230) by a predetermined length. The protrusion (435) may come into contact with the one-way connection bus bar (230). The protrusion (435) may guide more stable contact between the one-way connection bus bar (230) and the metal member (400). In addition, the protrusion (435) may further secure a larger cross-sectional area of ​​the metal member (400). In addition, the protrusion (435) may effectively prevent movement of the metal member (400) that may occur in the longitudinal direction (X-axis direction) and the width direction (Y-axis direction) of the battery pack (10) after insertion of the side frame (300) of the metal member (400).

[0091] The above protrusion (435) can be connected by welding (W) to the one-way connection bus bar (230). The welding (W) may be laser welding. Therefore, in the present embodiment, the connection stability between the metal member (400) and the one-way connection bus bar (230) can be further secured. In this way, in the present embodiment, the protrusion (435) can also function as a welding point that can secure contact stability with the one-way connection bus bar (230).

[0092] The above protrusion (435) may be provided in a trapezoidal shape. In the present embodiment, the side frame (300) may accommodate and support battery cells (100) provided as a cylindrical secondary battery. Due to the geometrical characteristics of the cylindrical secondary battery, the portion of the side frame (300) that accommodates the plurality of battery cells (100) may be provided in a convex-concave shape. Specifically, the portion of the side frame (300) that accommodates the battery cells (100) may be provided in a shape in which convex portions and concave portions are alternately arranged along the longitudinal direction (X-axis direction) of the side frame (300). In the present embodiment, interference with the metal member (400) that may occur in the portion that accommodates the battery cells (100) provided in the convex-concave shape can be effectively prevented through the protrusion (435) provided in the trapezoidal shape.

[0093] The above protrusions (435) may be provided in multiple numbers. The multiple protrusions (435) may be arranged to be spaced apart from each other by a predetermined distance along the longitudinal direction (X-axis direction) of the connecting body (432). Therefore, in the present embodiment, the movement of the metal member (400) that may occur in the longitudinal direction (X-axis direction) of the side frame (300) can be more reliably prevented through the multiple protrusions (435) that are spaced apart from each other by a predetermined distance along the longitudinal direction (X-axis direction) of the connecting body (432).

[0094] The plurality of protrusions (435) may be arranged between the plurality of battery cells (100) in the longitudinal direction (X-axis direction) of the connecting body (432). Therefore, in the present embodiment, the rigidity of the side frame (300) between the plurality of battery cells (100) is further reinforced through the plurality of protrusions (435), and movement between the plurality of battery cells (100) that may occur in the longitudinal direction (X-axis direction) of the side frame (300) can also be prevented.

[0095] The above one-way connection bus bar (230) may be provided on the outermost sides (+Y-axis direction and -Y-axis direction) of the sub bus bar unit (210). The above metal member (400) may be provided on the outermost sides (+Y-axis direction and -Y-axis direction) of the side frame (300). Therefore, the above metal member (400) may prevent the sub bus bar unit (210) from being broken, which may occur on the outermost sides (+Y-axis direction and -Y-axis direction) of the side frame (300), and may also reinforce the rigidity of the outermost sides (+Y-axis direction and -Y-axis direction) of the side frame (300).

[0096]

[0097] Hereinafter, the side frame (300) according to one embodiment of the present invention will be examined in more detail.

[0098] The above side frame (300) may include a plurality of side structures (310) and a pair of side walls (330).

[0099] The plurality of side structures (310) can support the plurality of battery cells (100). The plurality of side structures (310) are formed to a predetermined length along the longitudinal direction (X-axis direction) of the battery pack (10) and can accommodate and support the battery cells (100) in two rows. The plurality of side structures (310) can be interconnected while accommodating and supporting the battery cells (100) in the width direction (Y-axis direction) of the battery pack (10).

[0100] The pair of side walls (330) above form both side surfaces of the side frame (300) and may be provided on the outermost sides (+Y-axis direction and -Y-axis direction) of the plurality of side structures (310). The pair of side walls (330) may accommodate and support the plurality of battery cells (100) in at least one row. The pair of side walls (330) may be connected to the side structures (310) facing each other in the width direction (Y-axis direction) of the battery pack (100).

[0101] The metal member (400) may be provided on the pair of side walls (330). Since the metal member (400) is provided on the pair of side walls (330) forming both side surfaces of the side frame (300), the electrical connection between the bus bar assembly (200) and the battery cells (100) on both side surfaces of the side frame (300) can be secured while reinforcing the rigidity of the pair of side walls (330) exposed on both side surfaces (+Y-axis direction and -Y-axis direction) of the side frame (300).

[0102] The metal member (400) may be mounted on the side frame (300) through an insert injection process. Specifically, the metal member (400) may be mounted on each of the pair of side walls (330) through an insert injection process. This insert injection process may be performed during a manufacturing process of the side wall (330) or an assembly process of the side frame (330). In the present embodiment, the metal member (400) may be integrated into the side wall (330) through this insert injection process.

[0103] The above metal member (400) may be made of aluminum. Therefore, in the present embodiment, the electrical connection stability of the busbar assembly (200) can be achieved with a lighter material.

[0104] The thickness of the metal member (400) may be at least 2 mm. Therefore, in the present embodiment, the rigidity of the side wall (330) can be reinforced in both the lateral direction (Y-axis direction) and the height direction (Y-axis direction) of the side wall (330).

[0105] The above pair of side walls (330) may each include a metal member receiving portion (333), a metal member mounting portion (336), and a cell receiving portion (338).

[0106] The metal member receiving portion (333) may be provided at a predetermined depth along the height direction (Z-axis direction) of the side wall (330). The metal member receiving portion (333) may be provided as a receiving groove of a predetermined length. The insertion portion (410) of the metal member (400) may be inserted into the metal member receiving portion (333).

[0107] The metal member mounting portion (336) may be bent from the end of the metal member receiving portion (333) and provided on the upper surface (335) of the side wall (330). The bus bar connecting portion (430) of the metal member (400) may be mounted on the metal member mounting portion (336).

[0108] The metal member mounting portion (336) may be provided at a predetermined depth from the upper surface (335) of the side wall (330). The predetermined depth may be formed to correspond to the thickness of the bus bar connection portion (430) of the metal member (400). Specifically, the predetermined depth may be formed to be the same as the thickness of the bus bar connection portion (430). Therefore, when the bus bar connection portion (430) of the metal member (400) is mounted onto the metal member mounting portion (336), the metal member mounting portion (336) may not protrude beyond the upper surface (335) of the side wall (330).

[0109] Accordingly, in the present embodiment, when the metal member (400) and the one-way connection bus bar (230) of the sub-bus bar unit (210) are connected in contact, the one-way connection bus bar (230) can be stably placed on the upper surface (335) of the side wall (330).

[0110] In addition, in this embodiment, the bus bar connecting portion (430) is installed in a manner that it is fitted onto the metal member mounting portion (336), so that movement of the metal member (400) out of the side wall (330) can be more reliably prevented.

[0111] The cell receiving portion (333) can receive and support the plurality of battery cells (100). In addition, the cell receiving portion (333) can also receive and support a cooling tube (500) to be described later. The cell receiving portion (333) can be formed in a protruding and recessed shape in the longitudinal direction (X-axis direction) of the side wall (330). This is a shape corresponding to the shape of the plurality of battery cells (100) provided as a cylindrical secondary battery, and is intended to receive and support the plurality of battery cells (100) to the greatest extent possible while minimizing dead space.

[0112] The edge (337) of the side wall (330) may be provided to protrude by a predetermined height from the upper surface (335) of the side wall (330) in the height direction (Z-axis direction) of the side wall (330). The predetermined height may be at least equal to or higher than the height of the one-way connection bus bar (230) of the sub bus bar unit (210). Accordingly, when the one-way connection bus bar (230) of the sub bus bar unit (210) is seated toward the side wall (330), the one-way connection bus bar (230) may be seated on the upper surface (335) of the side wall (330) without protruding in the height direction (Z-axis direction) of the side wall (330). Therefore, in the present embodiment, the one-way connection bus bar (230) of the sub-bus bar unit (210) can be placed on the side wall (330) without being exposed outside the side wall (330).

[0113] In this embodiment, since the one-way connection bus bar (230) of the sub-bus bar unit (210) does not protrude outside the side wall (330) in the height direction (Z-axis direction) of the side wall (330), the risk of breakage or damage to the one-way connection bus bar (230) that may be caused by protrusion of the one-way connection bus bar (230) in the height direction (Z-axis direction) can be significantly reduced.

[0114]

[0115] Below, the busbar assembly (200) and other components constituting the battery pack (10) will be examined in more detail.

[0116] Referring to FIGS. 3 to 9, the busbar assembly (200) may include the sub-busbar unit (210) and the busbar cover (250, 260).

[0117] The bidirectional connection busbar (220) of the above sub-busbar unit (210) may be provided in multiple units.

[0118] Each of the above-described plurality of bidirectional connection bus bars (220) may include a bus bar body (222) and electrode connection portions (224, 226).

[0119] The above busbar body (222) is formed to a predetermined length and may be provided as a single layer structure. The above busbar body (222) may be provided in a shape corresponding to the arrangement structure of the battery cells (100) so as to increase the electrical connection efficiency with the battery cells (100).

[0120] The above busbar body (222) may be formed of a conductive material. For example, the busbar body (222) may be formed of a metal material, such as aluminum or copper. However, the present invention is not limited thereto, and the busbar body (222) may also be formed of other materials for the electrical connection.

[0121] The above electrode connection portion (224, 226) may include a positive connection portion (224) and a negative connection portion (226).

[0122] The above positive electrode connection portion (224) is provided to protrude on one side (+Y-axis direction or -Y-axis direction) of the bus bar body (222) in the width direction, and can be connected to the positive electrode (110) of the battery cells (100).

[0123] The negative electrode connection portion (226) may be provided to protrude from one width direction side (+Y-axis direction or -Y-axis direction) of the bus bar body (222) opposite the positive electrode connection portion (224) on the other width direction side (-Y-axis direction or +Y-axis direction) of the bus bar body (222). The negative electrode connection portion (226) may be connected to the negative electrode (130) of the battery cells (100).

[0124] The positive electrode connection portion (224) and the negative electrode connection portion (226) may be arranged alternately along the longitudinal direction (Y-axis direction) of the bus bar body (222). For example, as illustrated in FIG. 8, along the longitudinal direction (X-axis direction) of one bus bar body (222), a plurality of positive electrode connection portions (224) may be arranged on one width direction side (+Y-axis direction) of the bus bar body (222), and a plurality of negative electrode connection portions (226) may be arranged on the other width direction side (-Y-axis direction) of the bus bar body (222). Here, the plurality of positive electrode connection portions (224) and the plurality of negative electrode connection portions (226) may be arranged alternately along the longitudinal direction (X-axis direction) of one bus bar body (222). Alternating arrangement may mean that one negative bus bar (226) is arranged between two positive bus bars (224) in the longitudinal direction (X-axis direction) of the bus bar body (222), and one positive bus bar (224) is arranged between two negative bus bars (226) in the longitudinal direction (X-axis direction) of the bus bar body (222).

[0125] In this way, the positive bus bar (224) and the negative bus bar (226) can protrude from both sides (+X-axis direction and -Y-axis direction) of the width direction of the bus bar body (222) to form the bidirectional connection bus bar (220).

[0126] The one-way connection bus bar (230) of the above sub-bus bar unit (210) may be provided in multiple units.

[0127] Each of the above multiple one-way connection bus bars (230) may include a bus bar body (232) and an electrode connection portion (234, 236).

[0128] The above busbar body (232) is formed to a predetermined length and may be provided as a single layer structure. The above busbar body (232) may be provided in a shape corresponding to the arrangement structure of the battery cells (100) so as to increase the electrical connection efficiency with the battery cells (100).

[0129] The above busbar body (232) may be formed of a conductive material, like the busbar body (222) of the bidirectional connection busbar (220). For example, the busbar body (232) may be formed of a metal material, such as aluminum or copper. However, the present invention is not limited thereto, and it is of course possible for the busbar body (232) to be formed of other materials for the electrical connection.

[0130] The above electrode connection portion (234, 236) may include a positive connection portion (234) and a negative connection portion (236).

[0131] The above positive electrode connection portion (234) is provided to protrude on one side (+Y-axis direction or -Y-axis direction) of the bus bar body (232) in the width direction, and can be connected to the positive electrode (110) of the battery cells (100).

[0132] The negative electrode connection portion (236) may be provided to protrude from one side in the width direction (+Y-axis direction or -Y-axis direction) of the bus bar body (232) in the same direction as the positive electrode connection portion (234) on one side in the width direction (+Y-axis direction or -Y-axis direction) of the bus bar body (222). The negative electrode connection portion (236) may be connected to the negative electrode (130) of the battery cells (100).

[0133] In the present embodiment, the positive connection portion (234) and the negative connection portion (236) may be provided to protrude on one side in the width direction (+Y-axis direction or -Y-axis direction) of the busbar body (232) to form the one-way connection busbar (230). Here, the one-way connection busbar (230) may have only the positive connection portion (234) or the negative connection portion (236) on one side in the width direction (+Y-axis direction or -Y-axis direction) of the busbar body (232). In addition, the one-way connection busbar (230) may have both the positive connection portion (234) and the negative connection portion (236) on both sides in the width direction (+Y-axis direction or -Y-axis direction) of the busbar body (232). For example, the one-way connection bus bar (230) may be provided with both the positive connection portion (234) and the negative connection portion (236) on both sides of the width direction (-Y axis direction) of the bus bar body (232), as illustrated in FIG. 9.

[0134] These multiple one-way connection bus bars (230) may be provided on the outermost two sides (+Y-axis direction and -Y-axis direction) of the sub-bus bar unit (210). The multiple two-way connection bus bars (220) may be arranged between the multiple one-way connection bus bars (230).

[0135] The above busbar cover (250, 260) covers the upper side (+Z-axis direction) of the plurality of battery cells (100) and may be provided in a roughly flat plate shape. The shape and size of the busbar cover (250, 260) may vary depending on the number or capacity of the battery cells (100) required in the battery pack (1).

[0136] The above busbar cover (250, 260) may be formed of an insulating material. For example, the busbar cover (250, 260) may be formed of a polyimide film. However, the present invention is not limited thereto, and the busbar cover (250, 260) may also be formed of other insulating materials.

[0137] These bus bar covers (250, 260) are provided in multiple pieces with shapes and sizes that correspond to each other in the up-down direction (Z-axis direction) of the battery pack (10) and can be mutually connected with the sub bus bar unit (210) interposed therebetween.

[0138] Specifically, the plurality of bus bar covers (250, 260) may include a first cover (250) and a second cover (260).

[0139] The first cover (250) may cover the upper side (+Z-axis direction) of the sub-busbar unit (210). The first cover (250) may be provided with a plurality of guide holes (255). The plurality of guide holes (255) may form a predetermined opening space. The plurality of guide holes (255) may expose electrical connection portions of the electrodes (110, 130) of the battery cells (100) and the sub-busbar unit (210), thereby guiding the electrical connection between the electrodes (110, 130) of the battery cells (100) and the sub-busbar unit (210).

[0140] The second cover (260) may cover the lower side (-Z-axis direction) of the sub-bus bar unit (210). The second cover (260) may be provided with a plurality of guide holes (265). The plurality of guide holes (265) may form a predetermined opening space and may have a shape and size corresponding to the plurality of guide holes (255) of the first cover (250). The plurality of guide holes (265) may be in communication with the plurality of guide holes (255) of the first cover (250) when the first cover (250) and the second cover (260) are coupled.

[0141] The plurality of guide holes (265) can guide the electrical connection between the electrodes (110, 130) of the battery cells (100) and the sub-busbar unit (210) by exposing the electrical connection portions of the electrodes (110, 130) of the battery cells (100) and the sub-busbar unit (210) together with the plurality of guide holes (255) of the first cover (250).

[0142]

[0143] The above battery pack (10) may include a cooling tube (500).

[0144] The cooling tube (500) is formed to have a predetermined length and is provided between the plurality of battery cells (100) for cooling the plurality of battery cells (100). A plurality of such cooling tubes (500) may be provided.

[0145] The plurality of cooling tubes (500) may be provided to contact the outer surface of the plurality of battery cells (100) to increase cooling performance, and may be supported by the side frame (300).

[0146] The plurality of cooling tubes (500) may be provided with cooling channels for the flow of a cooling medium. In addition, the plurality of cooling tubes (500) may be connected in communication with a cooling device or the like for the circulation of the cooling medium. The cooling medium may be provided as a cooling fluid. In the present embodiment, the cooling fluid may be provided as water, and may include one or more fluids capable of exchanging heat with the surrounding environment in addition to water.

[0147]

[0148] FIG. 16 is a drawing for explaining a battery pack according to another embodiment of the present invention, and FIG. 17 is a drawing for explaining a metal member provided on a side wall of a side frame of the battery pack of FIG. 16. Meanwhile, in FIG. 16, as in the previous embodiment, the configuration of the busbar cover (250, 260) of the busbar assembly (200) described later is omitted for convenience of explanation.

[0149] Since the battery pack (20) according to the present embodiment is similar to the battery pack (10) of the previous embodiment, duplicate descriptions of components that are substantially the same or similar to those of the previous embodiment will be omitted, and the following will focus on differences from the previous embodiment.

[0150] Referring to FIGS. 16 and 17, the battery pack (20) may include the plurality of battery cells (100), the bus bar assembly (200), the side frame (305), the metal member (405), and the cooling tube (500).

[0151] Since the above plurality of battery cells (100) are substantially the same or similar to those of the previous embodiment, a duplicate description thereof will be omitted below.

[0152] The above busbar assembly (200) may include a sub-busbar unit (210). Although omitted in FIG. 16, the busbar assembly (200) may include the busbar cover (250, 260, see FIG. 7) as in the previous embodiment.

[0153] The above sub-busbar unit (210) may include a two-way connection busbar (220) and a one-way connection busbar (230).

[0154] The above two-way connection bus bar (220) and the above one-way connection bus bar (230) are substantially the same as or similar to the previous embodiment, so a duplicate description thereof is omitted below.

[0155] The above side frame (305) may include a plurality of side structures (310) and a pair of side walls (350).

[0156] Since the above-described plurality of side structures (310) are substantially the same or similar to the previous embodiment, a duplicate description thereof will be omitted below.

[0157] The above pair of side walls (350) may each include a metal member receiving portion (353), a metal member mounting portion (356), and a cell receiving portion (358).

[0158] Since the above metal member receiving portion (353) is similar to the metal member receiving portion (333) of the previous embodiment, a duplicate description thereof will be omitted below.

[0159] The metal member mounting portion (356) may be formed at a predetermined depth on the upper surface of the side wall (350) from the end of the metal member receiving portion (353). The metal member mounting portion (356) may be provided in a shape corresponding to the bus bar connecting portion (450) of the metal member (405) described below.

[0160] Since the above cell receiving portion (358) is similar to the above cell receiving portion (338) of the previous embodiment, a duplicate description thereof will be omitted below.

[0161] The above metal member (405) may include an insertion portion (415) and a bus bar connection portion (450).

[0162] The above insertion part (415) can be inserted into the metal member receiving part (353) of the side wall (350). Since the above insertion part (415) is similar to the above insertion part (410) of the previous embodiment, a duplicate description thereof will be omitted below.

[0163] The above bus bar connecting portion (450) may include a connecting body (452) and a protrusion (455).

[0164] Since the above connecting body (452) is similar to the connecting body (432) of the previous embodiment, a duplicate description thereof will be omitted below.

[0165] The above protrusion (455) may be integrally protruded from the connecting body (452). The above protrusion (455) may be provided as a single protrusion structure having a predetermined length and a predetermined width for each connecting body (452). The single protrusion (455) provided for each connecting body (452) may be provided in a roughly long trapezoidal shape.

[0166] In this embodiment, the protrusion (455) is formed to have a predetermined length and width in the shape of a long trapezoid, so that the area of ​​the protrusion (455) can be relatively secured more.

[0167] Therefore, in this embodiment, the cross-sectional area of ​​the metal member (405) that can increase the stability of the electrical connection when electrically connecting the one-way connection bus bar (230) can be secured more.

[0168] Since the above cooling tube (500) is substantially the same as or similar to the previous embodiment, a duplicate description thereof will be omitted below.

[0169]

[0170] FIG. 18 is a drawing for explaining a battery pack according to another embodiment of the present invention, FIG. 19 is an exploded perspective view of a side wall of a side frame provided in the battery pack of FIG. 18, FIG. 20 is a perspective view of a metal member provided in the side wall of FIG. 19, FIG. 21 is a side view of the metal member of FIG. 20, FIG. 22 is a cross-sectional view including the metal member in the side wall of FIG. 19, and FIG. 23 is a schematic enlarged view of a main part of the side wall including the metal member of FIG. 22. Meanwhile, in FIG. 18, as in the previous embodiment, the configuration of the busbar cover (250, 260) of the busbar assembly (200) described later is omitted for convenience of explanation.

[0171] Since the battery pack (30) according to the present embodiment is similar to the battery pack (10) of the previous embodiment, duplicate descriptions of components that are substantially the same or similar to those of the previous embodiment will be omitted, and the differences from the previous embodiment will be examined below.

[0172] Referring to FIGS. 18 to 23, the battery pack (30) may include the plurality of battery cells (100), the busbar assembly (200), the cooling tube (500), the side frame (600), and the metal member (700).

[0173] Since the above plurality of battery cells (100) are substantially the same or similar to the previous embodiment, a duplicate description thereof will be omitted below.

[0174] The above busbar assembly (200) may include a sub-busbar unit (210) and a busbar cover (250, 260, see FIG. 7). For convenience of explanation, the busbar cover (250, 260, see FIG. 7) is omitted in FIG. 18.

[0175] The above sub-busbar unit (210) may include a two-way connection busbar (220) and a one-way connection busbar (230).

[0176] The above two-way connection bus bar (220) and the above one-way connection bus bar (230) are substantially the same as or similar to the previous embodiment, so a duplicate description thereof is omitted below.

[0177] Since the above cooling tube (500) is substantially the same as or similar to the previous embodiment, a duplicate description thereof will be omitted below.

[0178] The above side frame (600) may include a plurality of side structures (610) and a pair of side walls (630).

[0179] Since the above plurality of side structures (610) are substantially the same as or similar to the above plurality of side structures (310) of the previous embodiment, a duplicate description thereof will be omitted below.

[0180] The above pair of side walls (630) may each include a metal member receiving portion (650), a metal member mounting portion (660), and a cell receiving portion (670).

[0181] The metal member receiving portion (650) may be formed as a multi-stage bending groove structure. Specifically, the metal member receiving portion (650) may include a first receiving portion (652), a second receiving portion (654), and a third receiving portion (656).

[0182] The first receiving portion (652) may be provided in the shape of a long groove having a predetermined length along the height direction (Z-axis direction) of the side wall (630) within the side wall (630).

[0183] The second receiving portion (654) may be formed by being bent from the upper portion (+Z-axis direction) of the first receiving portion (652) in a horizontal direction (Y-axis direction), specifically, in one side (+Y-axis direction or -Y-axis direction) of the width direction of the side wall (630), to extend to a predetermined length.

[0184] The third receiving portion (656) may be formed to extend to a predetermined length by being bent from the end of the second receiving portion (654) toward the height direction (Z-axis direction) of the side wall (630), specifically, toward the upper end (+Z-axis direction) of the side wall (630). The third receiving portion (656) may be connected to a metal member mounting portion (660) described later.

[0185] The above metal member fixing portion (660) can be provided in a shape and size corresponding to the bus bar connecting portion (730) of the metal member (700) described later.

[0186] Since the above cell receiving portion (670) is similar to the cell receiving portion (338) of the previous embodiment, a duplicate description thereof will be omitted below.

[0187] The above metal member (700) may be formed into a multi-stage bending structure. The above metal member (700) may include an insertion portion (710) and a busbar connecting portion (730).

[0188] The above insertion portion (710) may include a first insertion portion (712), a second insertion portion (714), and a third insertion portion (716).

[0189] The first insertion portion (712) may be formed to have a predetermined length along the height direction (Z-axis direction) of the insertion portion (710). The second insertion portion (714) may be formed to extend to a predetermined length in the horizontal direction (Y-axis direction) of the insertion portion (710) by being integrally bent from the upper end of the first insertion portion (712). The third insertion portion (716) may be formed to extend to a predetermined length by being bent from the end of the second insertion portion (714) in the height direction (Z-axis direction) of the insertion portion (710), specifically, in the upper side (+Z-axis direction) of the insertion portion (710). In the present embodiment, the cross-sectional area of ​​the insertion portion (710) may be increased through the first insertion portion (712) to the third insertion portion (716) formed in such a multi-stage bending manner, thereby further enhancing the stability of the electrical connection of the one-way connection bus bar (230).

[0190] The first insertion portion (712) may be inserted into the first receiving portion (652), the second insertion portion (714) may be inserted into the second receiving portion (654), and the third insertion portion (716) may be inserted into the third receiving portion (656). In the present embodiment, through the metal member receiving portion (650) of the side wall (630) having such a multi-stage bending structure and the insertion portion (710) of the metal member (700) having the multi-stage bending structure inserted into the metal member receiving portion (650) having the multi-stage bending structure, the metal member (700) may be prevented from being detached from the side wall (630) or from being moved within the side wall (630).

[0191] The above bus bar connecting portion (730) may include a connecting body (732) and a protrusion (735).

[0192] The above connecting body (732) can be formed to a predetermined length in the horizontal direction (Y-axis direction) by bending from the upper end of the third insertion portion (716) in the opposite direction to the bending direction of the second insertion portion (714).

[0193] The above protrusion (735) may be formed to protrude integrally from the connecting body (732). One end of the connecting body (732) may extend integrally with the third insertion portion (716), and the other end of the connecting body (732) may extend integrally with the protrusion (735).

[0194] The above protrusions (735) may be provided in multiple numbers. The multiple protrusions (735) may be provided to protrude to a position close to the convex end of the cell receiving portion (670) in the width direction (Y-axis direction) of the side wall (630).

[0195] Therefore, in this embodiment, the cross-sectional area of ​​the protrusion (735) can be secured as much as possible on the side wall (630) to further increase the stability of the electrical connection of the one-way connection bus bar (230).

[0196]

[0197] FIG. 24 is a drawing for explaining a battery pack according to another embodiment of the present invention, FIG. 25 is a drawing for explaining a one-way connection busbar of a sub-busbar unit of a busbar assembly of the battery pack of FIG. 24, FIG. 26 is a drawing for explaining a one-way connection busbar of a sub-busbar unit of the busbar assembly of the battery pack of FIG. 24 according to another embodiment, and FIG. 27 is a drawing for explaining a connection between a one-way connection busbar of the busbar assembly of the battery pack of FIG. 24 and a metal member. Meanwhile, in FIGS. 24 and 27, as in the previous embodiment, the configuration of the busbar cover of the busbar assembly (800) described later is omitted for convenience of explanation.

[0198] Since the battery pack (40) according to the present embodiment is similar to the battery pack (30) of the previous embodiment, duplicate descriptions of components that are substantially the same or similar to those of the previous embodiment will be omitted, and the following will focus on differences from the previous embodiment.

[0199] Referring to FIGS. 24 to 27, the battery pack (40) may include the plurality of battery cells (100), the cooling tube (500), the side frame (600), the metal member (700), and the busbar assembly (800).

[0200] Since the above-described plurality of battery cells (100) and the cooling tube (500) are substantially the same or similar to those of the previous embodiment, a duplicate description thereof will be omitted below.

[0201] The above side frame (600) may include a plurality of side structures (610) and a pair of side walls (630).

[0202] Since the above-described plurality of side structures (610) are substantially the same as or similar to the previous embodiment, a duplicate description thereof will be omitted below.

[0203] The above pair of side walls (630) may each include a metal member receiving portion (650), a metal member mounting portion (660), and a cell receiving portion (670).

[0204] The metal member receiving portion (650), the metal member fixing portion (660), and the cell receiving portion (670) are substantially the same as or similar to those in the previous embodiment, and therefore, a duplicate description thereof will be omitted.

[0205] The above metal member (700) may include an insertion portion (710) and a bus bar connection portion (730).

[0206] Since the above insertion part (710) is substantially the same as or similar to the previous embodiment, a duplicate description thereof will be omitted below.

[0207] The above bus bar connecting portion (730) may include a connecting body (732) and a plurality of protrusions (735).

[0208] The above connecting body (732) and the plurality of protrusions (735) are substantially the same as or similar to those of the previous embodiment, so a duplicate description thereof is omitted below.

[0209] The above busbar assembly (800) may include a sub-busbar unit (810) and a busbar cover. The busbar cover is substantially the same as or similar to the busbar cover (250, 260, see FIG. 7) of the previous embodiment, and is omitted in FIGS. 24 and 27 for convenience of explanation.

[0210] The above sub-busbar unit (810) may include a bidirectional connection busbar (820) and a unidirectional connection busbar (830).

[0211] The above two-way connection busbar (820) may be provided in multiple units, and each may include a busbar body (822) and an electrode connection portion (824, 826). The electrode connection portion (824, 826) may include a positive connection portion (824) and a negative connection portion (826). The busbar body (822), the positive connection portion (824), and the negative connection portion (826) are substantially the same as or similar to the busbar body (222), the positive connection portion (224), and the negative connection portion (226) of the previous embodiment, and therefore, a duplicate description thereof will be omitted.

[0212] The above one-way connection busbars (830, 840) may be provided in multiple numbers, and may each include a busbar body (832, 842) and an electrode connection portion (834, 836, 844, 846). The electrode connection portions (834, 836, 844, 846) may include a positive connection portion (834, 844) and a negative connection portion (836, 846). As illustrated in FIG. 25, the one-way connection busbar (830) may be provided such that one busbar body (832) has only positive connection portions (834) or only negative connection portions (836). In addition, the one-way connection bus bar (840) may be provided with both positive connection parts (844) and negative connection parts (846) on one bus bar body (842), as illustrated in FIG. 26. The shape structure of the one-way connection bus bar (830, 840) may be determined by considering the design according to the electrical connection type with the battery cells (100) or the arrangement type on the side wall (630).

[0213] The above one-way connection bus bar (830, 840) may include a cross-sectional reinforcement portion (838, 848).

[0214] The above cross-sectional reinforcement portion (838, 848) may be integrally provided with the busbar body (832, 842). The above cross-sectional reinforcement portion (838, 848) may be formed to protrude from the busbar body (832, 842) to a predetermined size so as to secure a predetermined cross-sectional area.

[0215] In this embodiment, the cross-sectional area of ​​the one-way connection bus bar (830, 840) can be further secured through the cross-sectional area reinforcement portion (838, 848), thereby further increasing the stability of the electrical connection of the one-way connection bus bar (830, 840).

[0216] The above cross-sectional reinforcement parts (838, 848) may be provided in multiple numbers. The multiple cross-sectional reinforcement parts (838, 848) may be provided between the electrode connection parts (834, 836, 844, 846).

[0217] The above-described plurality of cross-sectional reinforcement parts (838, 848) can be formed to protrude in the same direction as the protruding direction of the electrode connecting parts (834, 836, 844, 846) in one width direction (+Y-axis direction or -Y-axis direction) of the bus bar body (832, 842).

[0218] The plurality of cross-sectional reinforcing portions (838, 848) may be provided in a shape corresponding to the plurality of protrusions (735) of the busbar connection portion (730) of the metal member (700). The plurality of cross-sectional reinforcing portions (838, 848) may be seated on the plurality of protrusions (735) when the one-way connection busbar (830) is seated for contact with the busbar connection portion (730) of the metal member (700). At this time, the plurality of cross-sectional reinforcing portions (838, 848) may be arranged to approximately completely overlap the plurality of protrusions (735). A welding process (W, see FIG. 15) such as the laser welding may be performed at the overlapping portions of the plurality of cross-sectional reinforcing portions (838, 848) and the plurality of protrusions (735).

[0219] Therefore, in this embodiment, the welding accuracy can be further increased during the welding process of the one-way connection bus bar (830, 840) and the metal member (700), and the convenience of the work can also be secured during the welding process.

[0220]

[0221] Fig. 28 is a drawing for explaining a vehicle according to one embodiment of the present invention.

[0222] Referring to FIG. 28, a vehicle (1) according to an embodiment of the present invention may include at least one battery pack (10, 20, 30, 40) according to the present invention. In addition to the battery pack (10, 20, 30, 40), the vehicle (1) according to an embodiment of the present invention may further include various other components included in the vehicle. For example, the vehicle (1) according to an embodiment of the present invention may further include a body, a motor, a control device such as an ECU (electronic control unit), etc., in addition to the battery pack (10, 20, 30, 40) according to an embodiment of the present invention.

[0223] In addition, it goes without saying that the battery pack (10, 20, 30, 40) according to one embodiment of the present invention may be installed in other devices, apparatuses, and facilities, such as an energy storage system using a secondary battery, in addition to the automobile (1).

[0224] According to various embodiments as described above, a battery pack (10, 20, 30, 40) capable of maximizing energy density while ensuring stability of an electrical connection structure and a vehicle (1) including the same can be provided.

[0225] In addition, according to various embodiments as described above, a battery pack (10, 20, 30, 40) capable of further increasing structural rigidity and a vehicle (1) including the same can be provided.

[0226]

[0227] As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and various modifications and variations are possible by a person having ordinary skill in the art to which the present invention pertains within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below.

Claims

1. In the battery pack, Multiple battery cells; A busbar assembly including a sub-busbar unit disposed on one side of the plurality of battery cells and connected to electrodes of the plurality of battery cells; and A side frame having a metal member that supports the plurality of battery cells at the bottom of the busbar assembly and is connected to the sub-busbar unit. A battery pack comprising:

2. In paragraph 1, The above sub-busbar unit is, A bidirectional connection bus bar connected to the electrodes of the battery cells on both sides of the width direction of the sub-bus bar unit; and A one-way connection busbar connected to the electrodes of the battery cells on one side of the width direction of the above sub-busbar unit. Includes, The above metal member, A battery pack characterized in that it is connected to the above one-way connection bus bar.

3. In paragraph 2, A portion of the above metal member, Contacts the one-way connection bus bar on the upper side of the above side frame, The remainder of the above metal member, A battery pack characterized in that it is inserted into the above side frame.

4. In paragraph 2, The above metal member, A battery pack characterized in that it is inserted into the side frame and one end is bent and connected to the one-way connection bus bar at the upper part of the side frame.

5. In paragraph 2, The above metal member, an insertion portion inserted into the side frame; and A busbar connecting portion that is bent from the above insertion portion and connected to the one-way connection busbar outside the side frame. A battery pack comprising:

6. In paragraph 5, The above bus bar connection part is, A connecting body formed to a predetermined length along the longitudinal direction of the above one-way connection bus bar; and A protrusion that protrudes from the above connecting body toward the one-way connection bus bar by a predetermined length and comes into contact with the one-way connection bus bar. A battery pack comprising:

7. In paragraph 6, The above protrusion is, A battery pack characterized by being welded and connected to the above one-way connection bus bar.

8. In paragraph 6, The above protrusion is, A battery pack characterized by being formed in a trapezoidal shape.

9. In paragraph 6, The above protrusion is, It is equipped with multiple pieces, The above multiple protrusions are, A battery pack characterized in that the connecting bodies are arranged at a predetermined distance apart from each other along the length direction of the connecting bodies.

10. In paragraph 7, The above multiple protrusions are, A battery pack characterized in that the plurality of battery cells are arranged between the plurality of battery cells in the longitudinal direction of the connecting body.

11. In paragraph 2, The above one-way connection busbar is, Equipped on both outermost sides of the above sub-bus bar unit, The above metal member, A battery pack characterized in that it is provided on both outermost sides of the above side frame.

12. In paragraph 1, The above side frame, A plurality of side structures supporting the plurality of battery cells; and A pair of side walls provided on the outermost sides of the above multiple side structures Includes, The above metal member, A battery pack characterized in that it is provided on the above pair of side walls.

13. In paragraph 1, The above metal member, A battery pack characterized in that it is mounted on the above side frame through an insert injection process.

14. In paragraph 1, The above metal member, A battery pack characterized by being made of aluminum material.

15. In paragraph 1, The thickness of the above metal member is A battery pack characterized by at least 2 mm.

16. In automobiles, A vehicle characterized by comprising at least one battery pack according to any one of claims 1 to 15.

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